Patent Application
20080122893
The present invention relates to an ink-jet recording apparatus, and more particularly, to an ink-jet recording apparatus having the function of recording without leaving blank space on at least one of the areas above, below, and on either side of a recording medium, as well as to a recording method for use with the apparatus.
An exampled structure of a presently-known platen of an ink-jet recording apparatus will now be described. The ink-jet recording head has a dot formation element array (hereinafter referred to as a “nozzle array”) in which a plurality of dot formation elements (hereinafter referred to as “nozzles”) are arranged in a secondary scanning direction. A platen is provided opposite the recording head and functions to hold recording paper in position during a recording operation performed by a printer. A plurality of ribs are provided on the surface of the platen at given intervals in the primary scanning direction. Flat surfaces of the ribs support the recording paper, thus holding the recording paper in position relative to the recording head.
In a normal printing operation of the ink-jet recording apparatus, data are printed while the top and bottom margins of the recording paper are maintained blank. However, on some occasions, data are printed from the top end of the recording paper without leaving a margin. In a case where data are printed without leaving a margin (hereinafter often called “margin-free printing”), a presently-known platen structure cannot prevent the ink squirted outside the top end of the recording paper (hereinafter referred to as “discarded ink”) from adhering to the surface of the platen. The ink which has adhered to the platen adheres to another sheet of recording paper, thus making a stain on the other sheet of recording paper.
To prevent occurrence of such a stain, there has already been proposed a printer in which a large hole is formed in the surface of the platen so as to extend over the entire area of the surface opposite the nozzle array of the recording head. The discarded ink is received by the large hole, thus preventing adherence of the discarded ink to the platen. However, presence of the large hole makes the leading edge of recording paper supplied by a paper feed roller (which may also be called a roller for feeding the recording medium) likely to collide with the wall of the large hole. In the event of such a collision, a so-called paper jam is likely to arise at this location. Further, the presence of a large hole results in the platen encountering difficulty in firmly supporting recording paper in a position opposite the nozzle array, thereby resulting in a change in the distance between the recording head and the recording paper. Consequently, print quality is deteriorated.
These problems arise even in a case where data are printed without leaving an end margin on recording paper. Problems resulting from data being printed without leaving an end margin are in principle the same as those arising in a case where data are printed from a top end of recording paper without leaving a margin, and hence repeated explanations of the problems are omitted.
Japanese Patent Laid-Open No. 169155/1996 describes a printer as an example ink-jet recording apparatus of the background art capable of printing data on a recording material without leaving a margin on either side of the recording medium.
In order to enable printing which eliminates a margin on either side of the recording medium, an ink-jet recording head of this printer is arranged so that the primary scanning range can be set to extend outside either side of the recording medium. Further, the printer is equipped with ink recovery means for recovering ink droplets squirted from the recording head at positions outside either side of the recording medium.
The above-described printer is a printer specifically designed for use in printing in which the printing medium ultimately assumes solid form; for example, solid and compact coating of a recording medium, such as a tape. The problems solved by the printer are elimination of non-coated areas from a tape during a solid coating process and staining of a recording medium to be transported, which would otherwise be caused when the ink droplets squirted during the solid coating process adhere to a guide member or a like member.
Therefore, the following technical demands are not taken into consideration in the design of this printer: a demand for enabling easy and reliable printing of an image of a certain photographic image data set on paper while leaving a margin on either side of the paper, and printing of the photographic image on paper of the same size while leaving a margin on either side of the paper (hereinafter often called a “lateral-margin-free printing”); and a demand for sufficiently reducing the portion of image data, which would be located outside either side edge of the paper and discarded when the image data are printed without leaving a margin on either side of the paper, to thereby effectively print the image data so as to minimize wastage of image data during lateral-margin-free printing. Lateral-margin-free printing of text data must inevitably be avoided. However, the printer of the background art fails to refer to or even suggest lateral-margin-free printing of text data.
The ink recovery means of the background art can recover the ink droplets squirted outside the edges of paper. However, the ink recovery means is not designed in consideration of preventing minute staining of paper edges, which would otherwise be caused by airborne ink mist stemming from discarded ink droplets. The airborne ink mist arises during the course of squirting of ink droplets. Hence, in a case where ink droplets are squirted over a long distance, airborne ink mist is likely to arise. Further, in a case where paper is carried while being laid on a mesh screen or a like component, a portion of ink collides with not perforations of the mesh screen but with the framework of the mesh screen, also causing airborne ink mist. An ink-jet recording apparatus capable of effecting printing of photographic quality is highly susceptible to influence of deterioration of print quality stemming from airborne ink mist.
Accordingly, the present invention is aimed at providing an ink-jet recording apparatus which records data on a recording medium without leaving a margin on the top end, a margin on the bottom end, or a margin on either side edge and without involvement of staining of the recording medium, which would otherwise be caused by discarded ink; which firmly supports the recording medium; which holds the recording medium in position during a recording operation; and which prevents deterioration of recording quality, as well as a recording method for use with the ink-jet recording apparatus.
The present invention is also aimed at providing an ink-jet recording apparatus which can readily and unfailingly record a certain photographic image data set on paper while leaving a margin on either side of the paper and which can readily and unfailingly record the image data set on paper of the same size without leaving a margin on either side of the paper; and which sufficiently reduces a portion of the image data set, which would be formed outside either side of the paper when the image data are recorded without leaving a margin on either side of the paper, to thereby minimize wastage of image data and enable effective recording of image data even at the time of recording of image data without leaving a margin, as well as a recording method for use with the ink-jet recording apparatus.
The present invention is further aimed at providing an ink-jet recording apparatus capable of diminishing the chance of occurrence of airborne ink mist and the chance of side portions of a recording medium being stained by airborne floating mist; in other words, capable of maintaining photograph-quality printing even in the side portions of the recording medium, and diminishing the chance of deterioration of print quality.
The present invention is further aimed at providing an ink-jet recording apparatus capable of simultaneously fulfilling the features of the ink-jet recording apparatus and those of recording methods, as described above.
To achieve the objects, the present invention provides an ink-jet recording apparatus comprising:
a recording head having a dot formation element array including a plurality of dot formation elements arranged along a secondary scanning direction;
a platen for holding a recording medium in position opposite the recording head during a printing operation while the recording head is caused to scan in a primary scanning direction;
a recording-medium feed roller disposed upstream of the recording head;
an output roller disposed downstream of the recording head; and
a first hole which is formed in an area of the platen opposite a downstream portion of the dot formation element array with respect to the secondary scanning direction, the platen guiding to the first hole the ink that has been discarded outside a top end of the recording medium when data are recorded on the recording medium without leaving a margin on the top end of the recording medium.
In the present invention, the first hole is not formed over the entire surface of the platen but locally at a position corresponding to the top end of a recording material when data are recorded on the recording medium without leaving a margin on the top end. A positioning-function section for holding the recording material in position is left in the area on the surface of the platen opposite the recording head. When data are recorded on the recording medium without leaving a margin on the top end of the recording medium, the ink squirted outside the top end is guided to the first hole. The recording material is firmly held in position relative to the recording head. In a case where data are recorded on the recording medium without leaving a margin on the top end of the recording medium, the chance of the recording material being stained with the thus-discarded ink. During a printing operation, the recording material is firmly held in position, thus preventing a decrease in quality.
The present invention further provides an ink-jet recording apparatus comprising:
a recording head having a dot formation element array including a plurality of dot formation elements arranged along a secondary scanning direction;
a platen for holding a recording medium in position opposite the recording head during a printing operation while the recording head is caused to scan in a primary scanning direction;
a recording-medium feed roller disposed upstream of the recording head;
an output roller disposed downstream of the recording head; and
a second hole which is formed in an area of the platen opposite an upstream portion of the dot formation element array with respect to the secondary scanning direction, the platen guiding to the second hole the ink that has been discarded outside a top end of the recording medium when data are recorded on the recording medium without leaving a margin on the top end of the recording medium.
In the present invention, the second hole is not formed over the entire surface of the platen but locally at a position corresponding to the top end of a recording material when data are recorded on the recording medium without leaving a margin on the top end. A positioning-function section for holding the recording material in position is left in the area on the surface of the platen opposite the recording head. When data are recorded on the recording medium without leaving a margin on the top end of the recording medium, the ink squirted outside the top end is guided to the second hole. The recording material is firmly held in position relative to the recording head. In a case where data are recorded on the recording medium without leaving a margin on the top end of the recording medium, the chance of the recording material being stained with the thus-discarded ink. During a printing operation, the recording material is firmly held in position, thus preventing a decrease in quality.
Preferably, a second hole is formed in an area of the platen opposite an upstream portion of the dot formation element array with respect to the secondary scanning direction, and there is guided to the second hole the ink that has been discarded outside a top end of the recording medium when data are recorded on the recording medium without leaving a margin on the top end of the recording medium.
As a result, in a case where data are recorded on the recording medium without leaving a margin on the top end and bottom end of the recording medium, the chance of the recording material being stained with the thus-discarded ink. During a printing operation, the recording material is firmly held in position, thus preventing a decrease in quality.
Preferably, the recording head is arranged so as to be able to selectively perform a standard interlaced recording operation for recording data by actuation of all the dot formation elements of the dot formation element array, and a limited interlaced recording operation for limitedly actuating a portion of the dot formation elements, through use of a dot drive control section, and the limited interlaced recording operation is performed when the top end of the recording medium is situated at the first hole and when the bottom end of the recording medium is situated at the second hole.
In a case where data are recorded on the recording medium without leaving a margin on the top end and bottom end of the recording medium, the limited interlaced recording operation is performed, thereby reducing the amount of ink to be discarded and the amount of image data to be discarded along with wastage of the ink. Therefore, the extent of paper cockle arising in the top or bottom end can be diminished. In the areas of the recording material other than the top end and bottom end thereof, an interlaced recording operation is performed. Consequently, high-quality recording can be effected without involvement of a reduction in throughput.
Preferably, in the area of the surface of the platen opposite the dot formation array, there are located flat tops which come into contact with the recording medium and support the recording medium from below.
As a result, the recording material can be stably, securely held in position relative to the recording head.
Preferably, in a downstream position outside the area of the surface of the platen opposite the dot formation array, there are located flat tops which come into contact with the recording medium and support the recording medium from below. As a result, even if ink erroneously adheres to the portion of the surface of the platen opposite the dot formation element array while data are recorded on the recording material though us of all the dot formation elements, the recording material is prevented from being sustained with the ink until output. Further, the distance between the recording material feed roller and the flat top can be set to a large value, thereby rendering the load of transporting a recording material lighter, thereby particularly improving the ability of the paper feed roller to feed thick paper.
Preferably, an ink-absorbing material is provided within each of the first and second holes. The ink absorbing material enables stable storage of discarded ink without involvement of leakage and can be easily replaced.
Preferably, a water repellent net is provided so as to cover an opening of each of the first and second holes, and ink-absorbing material is provided in each hole so as to be in contact with the hole. Since the opening of the first and second holes are covered with nets, the recording material is transported as if the first and second holes had not been formed in the platen, thereby firmly holding the recording material in position. Further, the discarded ink droplets collide with and adhere to the nets. However, the nets have a property of repelling water, and hence the ink that has adhered to the nets is immediately absorbed by the ink-absorbing member, thus substantially eliminating residual ink from the surface of the platen which is to contact the recording material. Accordingly, the recording material is held firmly in position, thereby substantially eliminating the chance of the discarded ink re-adhering to the recording material.
Preferably, a reclosable closure is attached to the opening of each of the first and second holes, and the closure is opened when data are recorded on the recording medium without leaving a margin on either the top or bottom end of the recording medium, the closure being closed when data are recorded on the recording medium while leaving a margin. When an image is recorded on the recording paper without leaving a margin on either the top end or the bottom end, the first hole or the second hole is opened by the closure. During a printing operation other than a margin-free printing operation, the closures are held in a closed position, thus preventing functional wastage.
Preferably, the closure has a pivot located below the opening of the corresponding hole and is pivotally opened or closed by being pivoted around the pivot. The configuration of the recording apparatus obviates a necessity for providing, in the travel path of the recording material, a mechanism for opening and closing the closures. Accordingly, there can be prevented an increase in the likelihood of a paper jam, which would otherwise be caused when a new member is provided in the recording apparatus.
Further, the present invention provides a recording method for recording data on a recording medium without leaving a margin through use of an ink-jet recording apparatus, the apparatus including:
a recording head having a dot formation element array including a plurality of dot formation elements arranged along a secondary scanning direction;
a platen which holds a recording medium in position opposite the recording head during a printing operation while the recording head is caused to scan in a primary scanning direction;
a recording-medium feed roller disposed upstream of the recording head; and
an output roller disposed downstream of the recording head, wherein
ink is squirted while the end portion of the recording medium is situated within the range of the dot formation element array in the secondary scanning direction, and a portion of the ink is discarded into a hole locally formed in the area of the surface of the platen opposite the end portion of the recording medium situated thereat, to thereby record data on the recording medium without leaving a margin on the edge of the recording medium.
In a case where data are recorded on the recording material without leaving a margin on the top end of the recording material, the recording method prevents a reduction in print throughput, the chance of recording material being sustained with discarded ink, and a reduction in recording quality by firmly holding the recording material in position during a recording operation.
Preferably, the recording head performs an interlaced recording operation for actuating one of the dot formation elements located at a position close to the end portion of all the dot formation elements when data are recorded on the end portion of the recording medium without leaving a margin, or an interlaced recording operation for recording data on the recording medium by actuation of all dot formation elements when the data are recorded in a record region other than the end portion. Therefore, there is yielded the same advantage as that yielded by the recording apparatus.
Further, the present invention provides an ink-jet recording apparatus comprising:
an ink-jet recording head on which a plurality of dot formation elements are arranged along a secondary scanning direction and which is reciprocally moved in a primary scanning direction;
a platen which is disposed opposite the recording head and holds a recording medium in position by supporting the recording medium from below when data are recorded, by means of the recording head, on the recording medium to be intermittently transported in the secondary scanning direction;
a control section for controlling, on the basis of recorded data, intermittent transportation of the recording medium in the secondary scanning direction, reciprocal movement of the recording head in the primary scanning direction, and the squirting of ink from the recording head;
ink-receiver open holes which are formed in the areas of the platen corresponding to the right and left sides of one type of recording medium of predetermined size or the right and left sides of two or more types of recording media of predetermined sizes, from among the recording media to be transported over the platen in the secondary scanning direction, the holes being formed so as to extend beyond the respective right and left sides of the employed recording medium and formed to longitudinally extend beyond the range of the dot formation elements in the secondary scanning direction; and
the control section having
in a case where data are recorded on the recording medium without leaving a margin on either side of the recording medium, the second operation mode is performed.
The control section has two operation modes; i.e., a first operation mode and a second operation mode. In the first operation mode, the control section expands recorded data and records the data in a recording region set inside either side of the recording medium of any of predetermined sizes. In a second operation mode, the control section expands the same recorded data and records the data within a record region which extends beyond either side of the recording medium of the same size and is positioned inside a non-reference-side edge of the recording medium within the corresponding one of the through holes. In the first operation mode, a certain photographic image data set can be normally recorded on the recording material of a single size while a margin is left on either side thereof. In the second operation mode, the image data set can be recorded on the recording material without a margin being left on either side thereof. In other words, since the control section is provided with the first and second operation modes, a certain photographic image data set can be readily and unfailingly recorded on the recording medium of a single size with or without a margin being left on either side thereof.
Further, since the control section is determined to operate according to either the first or second operation mode for the recording medium of a predetermined size, the second mode can be readily set such that the amount of image data to be produced and wasted outside either side of the recording medium is sufficiently reduced. Accordingly, image data can be effectively recorded without a margin being left, by means of minimizing wastage of image data.
The present invention further provides an ink-jet recording apparatus comprising:
an ink-jet recording head on which a plurality of dot formation elements are arranged along a secondary scanning direction and which is reciprocally moved in a primary scanning direction;
a platen which is disposed opposite the recording head, has a flat upper surface on which a plurality of protuberances protruding the same distance are formed at predetermined intervals in the primary scanning direction, and holds the recording medium in position by supporting the recording medium from below through use of flat tops of the plurality of protuberances when data are recorded, by means of the recording head, on the recording medium to be intermittently transported in the secondary scanning direction;
a control section for controlling, on the basis of recorded data, intermittent transportation of the recording medium in the secondary scanning direction, reciprocal movement of the recording head in the primary scanning direction, and the squirting of ink from the recording head;
ink-receiver open holes which are formed in the flat areas of the upper surface of the platen in which the protuberances are not formed, as well as in the areas of the upper surface of the platen corresponding to the right and left sides of one type of recording medium of predetermined size or the right and left sides of two or more types of recording media of predetermined sizes, from among the recording media to be transported over the platen in the secondary scanning direction, the holes being formed so as to extend beyond the respective right and left sides of the respective recording media and formed to longitudinally extend beyond the range of the dot formation elements in the secondary scanning direction; and
the control section having
in a case where data are recorded on the recording medium without leaving a margin on either side of the recording medium, the second operation mode is performed.
Protuberances protruding by the same distance are formed at predetermined intervals in the primary scanning direction and in an upper surface of the platen. When the recording head records image data on the recording medium while the recording medium is intermittently transported in the secondary scanning direction, the platen supports the recording medium from below, to thereby hold the recording medium in position relative to the recording head. The protuberances enable regular generation of paper cockle, which is usually caused when the recording medium is soaked with ink, thereby rendering stable the position of the recording medium in its widthwise direction. Therefore, setting of the record region for the second operation mode does not involve a necessity for taking into consideration a large positional offset of the recording paper attributable to paper cockle. Accordingly, the recording region for the second operation mode can be made small, thus enabling a further reduction in the amount of image data to be wasted during a margin-free recording operation.
Preferably, the recording region for the second mode is set to be wider than the width of the recording medium by 4.5 mm to 5.5 mm. By virtue of such an allowance, image data can be recorded on the recording medium without a margin being left on either side thereof and without being substantially influenced by a tolerance stemming from the design or manufacture of a path for transporting the recording medium.
Preferably, in both the first and second operation modes, the control section assumes, as a speed at which the recording head reciprocally travels in the primary scanning direction, a single acceleration gradient at which the recording head is to shift from a stationary state to a constant-speed state and a single deceleration gradient at which the recording head is to shift from the constant-speed state to the stationary state, and a travel distance attained by the recording head of the second operation mode in the constant-speed state is longer than a travel distance attained by the recording head of the first operation mode in the constant-speed state, and travel distance in an acceleration side and travel distance in a deceleration side are substantially equal. At the time of implementation of the first and second operation modes, the control required for reciprocally moving the recording head in the primary scanning direction can be facilitated. Recording throughput can be optimized in both the first and second operation modes.
Preferably, an ink-absorbing material is provided in each of the ink-receiver open holes, and the ink-absorbing material is situated within corresponding ink-receiver open hole such that the upper surface of the ink-absorbing material is located in the vicinity of the opening of the through hole opposite the recording head. Accordingly, the distance over which the ink droplets are squirted and wasted outside either side of the recording medium can be shortened. Further, the ink-absorbing material, which is disposed in each of the through holes such that the upper surface of the ink-absorbing material is situated in the vicinity of the opening opposite the recording head, immediately captures the ink droplets, thus significantly reducing the chance of occurrence of airborne ink mist.
Preferably, an ink-absorbing material is provided in each of the ink-receiver open holes, and the ink-absorbing material is situated within corresponding ink-receiver open hole such that the upper surface of the ink-absorbing material is located in the vicinity of the opening of the through hole opposite the recording head. As a result, there is yielded the same advantage as that mentioned above.
Preferably, a first removal stopper is provided along the edge of the opening of each of the ink-receiver open holes disposed opposite the recording head, for preventing removal of the ink-absorbing material toward the recording head. Since the upper surface of the ink absorbing material is firmly retained in position, generation of airborne ink mist can be stably prevented. Further, the chance of the upper surface of the ink absorbing material rubbing against the recording material being transported or the chance of the upper surface of the ink absorbing material rubbing against the recording material because of paper cockle can be reduced thoroughly.
Preferably, the first removal stopper is formed into a step provided along the edge of the opening of each of the ink-receiver open holes disposed opposite the recording head. Thus, the first removal stoppers can be readily formed integrally with the platen, and the thus-formed removal stops can exert a removal effect by means of a simple structure.
Preferably, each of the ink-receiver open holes penetrates through the platen from the side opposite the recording head to the other side. The through-hole structure enables insertion of the ink-absorbing material into each of the ink receiver open holes by means of pushing only the ink-absorbing material, thus facilitating assembly of ink receiver open holes with ink absorbing material.
Preferably, second removal stoppers are provided in each of the ink-receiver open hole for preventing removal of the ink-absorbing material away from the recording head. The second removal stoppers unfailingly prevent removal of the ink-absorbing material in the direction opposite the recording head. In cooperation with the first removal stoppers, the second removal stoppers can securely hold the ink-absorbing material within the through holes.
Preferably, the second removal stoppers are formed into raised long lines extending along the interior surface of the ink-receiver open hole in the direction of penetration. The second removal stoppers are formed in raised lines on the interior surface of each of the through holes, the lines aligned in the longitudinal direction thereof. Such a structure of the second removal stopper enables insertion of the ink-absorbing material into each of the through holes by means of pushing only the ink-absorbing material. Further, the second removal stoppers can be readily formed integrally with the through holes and can be readily formed integrally with the through holes.
Preferably, the second removal stoppers are each formed into a step provided along the edge of corresponding opening of the ink-receiver open hole disposed opposite the recording head. The step-shaped removal stoppers unfailingly prevent removal of the ink-absorbing material through employment of a simple structure and can be readily formed integrally with the through holes.
Preferably, a tilt section is provided in each of the ink-receiver open holes at an angle from the recording head to the other side so as to maintain the through state of the through hole, and an ink-absorbing material is laid on the tilt section. When image data are recorded on a recording medium without leaving a margin on either side of the recording medium, the ink which has been squirted from the recording head outside either side of the recording medium directly enters any of the through holes having openings, each opening longitudinally extending beyond the range of the recording head within which range nozzles are arranged. The ink then immediately adheres to the ink-absorbing material laid on the tilt section provided in any of the through holes. Accordingly, the chance of occurrence of airborne ink mist can be substantially obviated. Even when an ink-jet recording apparatus performs photographic-quality printing which does not involve leaving a margin on either side of the recording medium, there arises substantially no decrease in print quality of the lateral side areas of the recording medium. When the ink which has adhered to the ink-absorbing material accumulates to a certain level, the ink flows over the surface of the tilt section and is drained from the through holes.
Preferably, each of the ink-receiver open holes is formed in the form of a through hole, and a tilt section is provided in the through hole at an angle from the recording head to the other side so as to maintain the through state of the through hole, a plurality of ribs being provided on the tilt section at intervals such that holes are formed in the tilting direction, and top surfaces of the ribs being formed so as to be lower than the opening of the through hole. As in the case of the platen mentioned above, when image data are recorded on a recording medium without leaving a margin on either side of the recording medium, the ink which has been squirted from the recording head outside either side of the recording medium directly enters any of the through holes having openings, each opening longitudinally extending beyond the nozzle range of the recording head. The ink is then guided to the bottom of the holes by the plurality of walls located below the opening of each of the through holes. The walls exhibit an ink-capturing function, as does the ink-absorbing material, thereby substantially obviating the chance of occurrence of airborne ink mist. Even when an ink-jet recording apparatus performs photographic-quality printing which does not involve leaving a margin on either side of the recording medium, there arises substantially no decrease in print quality of the lateral side areas of the recording medium. When the ink which has adhered to the bottom of the holes accumulates to a certain level, the ink flows over the surface of the tilt section and is drained from the through holes.
Preferably, the ink-jet recording apparatus comprises:
a control section for controlling, on the basis of recorded data, intermittent transportation of the recording medium in the secondary scanning direction, reciprocal movement of the recording head in the primary scanning direction, and the squirting of ink from the recording head;
ink-receiver open holes which are formed in the areas of the platen corresponding to the right and left sides of one type of recording medium of predetermined size or the right and left sides of two or more types of recording media of predetermined sizes, from among the recording media to be transported over the platen in the secondary scanning direction, the holes being formed so as to extend beyond the respective right and left sides of the respective recording media and formed to longitudinally extend beyond the range of the dot formation elements in the secondary scanning direction; and
the control section having
in a case where data are recorded on the recording medium without leaving a margin on either side of the recording medium, the second operation mode is performed.
Recording of image data on a recording medium without leaving a margin on the top, bottom, or either side of the recording medium can be readily achieved, thus yielding the same advantages as those mentioned previously.
The present invention provides an ink-jet recording apparatus comprising:
a recording head having a dot formation element array including a plurality of dot formation elements arranged along a secondary scanning direction;
a platen for holding a recording medium in position opposite the recording head during a printing operation while the recording head is caused to scan in a primary scanning direction;
a recording-medium feed roller disposed upstream of the recording head;
an output roller disposed downstream of the recording head;
a flat top for supporting the recording medium from below which is provided in the area of the platen surface opposite the dot formation element array; and
a center hole formed in substantially the center of the flat top with respect to the direction in which the recording medium is to be transported, wherein, when data are recorded on the recording medium without leaving a margin on the top end and/or the bottom end of the recording medium, the ink discarded outside the top end or the bottom end is guided to the center hole.
The flat top stably supports the recording material, and use of only one center hole enables recording of data on the recording material without leaving a margin on the top end and/or the bottom end of the recording material.
The present invention provides an ink-jet recording apparatus comprising:
a recording head having a plurality of dot formation element arrays for respective colors and arranged sequentially along a secondary scanning direction, each dot formation element array including a plurality of dot formation elements arranged along the secondary scanning direction;
a platen for holding a recording medium in position opposite the recording head during a printing operation while the recording head is caused to scan in a primary scanning direction;
a recording-medium feed roller disposed upstream of the recording head;
an output roller disposed downstream of the recording head;
first holes formed in the positions of the surface of the platen opposite downstream portions of the respective dot formation element arrays of respective colors; and
second holes formed in the positions of the surface of the platen opposite upstream portions of the respective dot formation element arrays of the respective colors, wherein
when data are recorded on the recording medium without leaving a margin on the top end of the recording medium, the ink squirted from the dot formation element arrays of respective colors outside the top end is guided to the first holes, and
when data are recorded on the recording medium without leaving a margin on the bottom end of the recording medium, the ink squirted from the dot formation element arrays of respective colors outside the bottom end is guided to the second holes.
Even in a case where a plurality of color nozzles are arranged in a vertical column, the color nozzles are assigned respective hole pairs; that is, each pair consisting of the first hole and the second hole. As in the case of a recording head having color nozzles arranged horizontally, the recording head can record an image on either the top end or the bottom end of the recording paper without leaving a margin.
Preferably, the recording head is arranged so as to be able to selectively perform a standard interlaced recording operation for recording data by actuation of all the dot formation elements of the dot formation element array, and a limited interlaced recording operation for limitedly actuating a portion of the dot formation elements, through use of a dot drive control section, and the limited interlaced recording operation is performed when the top end of the recording medium is situated at the first holes and when the bottom end of the recording medium is situated at the second holes.
In a case where an image is recorded on the recording material without leaving a margin on the top end, the bottom end, and either end of the recording material, the amount of ink to be discarded into the first hole and the second hole and the amount of image data discarded in association with the amount of discarded ink can be reduced by means of performing a limited interlaced recording operation. Further, the limited interlaced recording operation enables a reduction in the degree of cockle arising in the top end, the bottom end, and either side of the recording paper. In the area of the recording paper other than the top end and the bottom end, a high-quality image can be recorded without involvement of a reduction in print throughput, by means of performing an ordinary interlaced recording operation.
Preferably, the recording head is arranged so as to be able to selectively perform a standard interlaced recording operation for recording data by actuation of all the dot formation elements of the dot formation element array, and a limited interlaced recording operation for limitedly actuating a portion of the dot formation elements, through use of a dot drive control section, and the limited interlaced recording operation is performed when the top end or the bottom end of the recording medium is situated at the center hole.
In a case where an image is recorded on the recording material without leaving a margin on either the top end or the bottom end, the amount of ink to be discarded into the first hole and the second hole and the amount of image data discarded in association with the amount of discarded ink can be reduced by means of performing a limited interlaced recording operation. Further, the limited interlaced recording operation enables a reduction in the degree of cockle arising in the top end or the bottom end of the recording paper. In the area of the recording paper other than the top end and the bottom end, a high-quality image can be recorded without involvement of a reduction in print throughput, by means of performing an ordinary interlaced recording operation.
Preferably, the recording head is arranged so as to be able to selectively perform a standard interlaced recording operation for recording data by actuation of all the dot formation elements of the dot formation element array, and a limited interlaced recording operation for limitedly actuating a portion of the dot formation elements, through use of a dot drive control section, and the limited interlaced recording operation is performed when the top end of the recording medium is situated at the first holes corresponding to the plurality of dot formation element arrays of respective colors and when the bottom end of the recording medium is situated at the second holes corresponding to the plurality of dot formation element arrays of respective colors.
Even in the case of a recording head in which a plurality of color nozzles are arranged in a vertical column, when an image is recorded on the recording material without leaving a margin on either the top end or the bottom end, the amount of ink to be discarded into the first hole and the second hole and the amount of image data discarded in association with the amount of discarded ink can be reduced by means of performing a limited interlaced recording operation. Further, the limited interlaced recording operation enables a reduction in the degree of cockle arising in the top end or the bottom end of the recording paper. In the area of the recording paper other than the top end and the bottom end, a high-quality image can be recorded without involvement of a reduction in print throughput, by means of performing an ordinary interlaced recording operation.
Preferred embodiments of the present invention will now be described by reference to the accompanying drawings.
As shown in
In the present embodiment, the first hole 11 is formed not over the entire surface of the platen 3 but locally so as to correspond to the top end 7 when data are recorded on the top end 7 of the recording paper 4 without leaving a margin. A positioning-function section for holding the recording paper 4 in position during a recording operation is left in the area on the platen 3 opposite a recording head 1; namely, ribs 5 and their flat tops 6 are formed within a range on the platen 3 opposite the nozzle array 2. When data are recorded on the recording paper 4 without leaving a margin on the top end 7, the ink droplets 12 which have been squirted outside the top end 7 and become discarded are introduced into the first hole 11. Even in such a case, the recording paper 4 is firmly held in position on the flat tops 6 of the ribs 5. Accordingly, the recording paper 4 can be stably held in position relative to the recording head 1.
A second hole 13 is formed in the portion of the surface of the platen 3 opposite an upstream portion of the nozzle array 2 in the secondary scanning direction. As shown in
The present embodiment employs the platen 3 having the first hole 11 and the second hole 13. However, there may also be employed a platen having only one of the holes. Division of the area of the platen 3 is determined on the basis of the nature of a presumed recording method.
A nozzle drive control section 23 (shown only in
As shown in
When execution of a standard print processing routine is commenced, dot formation data are set, and dots are formed while a primary scanning operation is performed. In the example shown in
The paper feed motor 23 is driven, to thereby perform a secondary scanning operation. In the example shown in
After completion of the secondary scanning operation, dots are formed in the area designated by the primary scanning operation P2; i.e., the area whose lower edge is at raster number −21. Through repetition of these processing operations, rasters are intermittently formed, thus enabling recording of an image. As is evident from, for example,
After formation of an image through standard print processing has been completed, printing of an image is performed by means of an intermediate processing operation. The flow of formation of dots performed during an intermediate processing operation is the same as that employed in the standard print processing routine. In the intermediate processing, the paper feed required for the secondary scanning operation differs from that required for the standard printing operation.
In contrast with a standard print processing operation in which paper is fed by the amount corresponding to seven rasters, paper is fed by the amount corresponding to four rasters during an intermediate processing operation, thus forming a raster (designated by the primary scanning operation P5 shown in
Setting of paper feed during an intermediate processing operation will now be described. During an intermediate processing operation of the present embodiment, transient feeding of paper by the amount corresponding to four rasters is followed by feeding of paper by a given amount corresponding to three rasters. The given paper feed corresponds to a paper feed for interlaced printing employed in a case where three nozzles are provided at a nozzle pitch corresponding to four rasters. The transient feeding of paper by the amount corresponding to four rasters, which had been performed at the beginning of the intermediate processing operation, is also set so as to avoid lack of rasters. The transient paper feed is determined in accordance with parameters such as a paper feed employed during the standard print processing operation and a paper feed employed during the intermediate processing operation.
Interlaced recording, during which the number of nozzles used is apparently diminished, is performed during the intermediate processing operation, because there can be broadened a region at which an image can be recorded while the accuracy of a paper feed is ensured.
In the thus-broadened print area, dots are recorded while the paper is fed in the secondary scanning direction by the amount corresponding to three rasters. At this time, the paper feed to be employed for effecting an interlaced recording operation is further diminished to three rasters.
After the foregoing settings have been effected, nozzles to be used are set. Nozzles which are not to be used are subjected to data masking. Here, the expression “data masking” means processing for hindering nozzles from forming dots.
Next, an expanded print processing operation is performed. The paper feed employed during the intermediate processing operation differs from that employed during the standard print processing operation. As mentioned previously, during an expanded print processing operation, dots are formed by means of interlaced recording operation while the paper is fed by the amount corresponding to three rasters. At this time, since the image has already been formed in the area located higher than raster number 0 (i.e., an area of RN≦0), the nozzles located in that area are prohibited from forming dots.
As has been described, a high-quality image can be produced by the interlaced recording method within the area to be subjected to a standard print processing operation. Further, the area where an image can be formed while the accuracy of a paper feed is ensured can be expanded by means of employment of the intermediate processing operation. Even in such a broadened area, an image is recorded by means of the interlaced recording method, thus enabling formation of a high-quality image. The area at which an image can be recorded can be broadened downward, by means of execution of an expanded print processing operation.
The standard interlaced recording method which utilizes actuation of all nozzles and has been described by reference to
A margin-free recording operation has been described by reference to an example in which a margin-free recording operation is achieved by means of a limited interlaced recording operation. In a case where an image is recorded on the recording paper 4 without leaving a margin on either the top end 7 or the bottom end 4′, the amount of ink to be discarded into the first hole 11 and the second hole 12, which has been described by reference to the example shown in
In the embodiment shown in
In the present embodiment, when an image is recorded on the recording paper 4 without leaving a margin on either the top end 7 or the bottom end 4′, the first hole 11 or the second hole 12 is opened by the closure 20 or 21. During a printing operation other than a margin-free printing operation, the closures 20 and 21 are held in a closed position, thus preventing functional wastage. Further, the pivot 22 is located at a position below the openings of the first and second holes 20 and 21, thereby obviating a necessity for providing, in the travel path of the recording paper 4, a mechanism for opening and closing the closures 20 and 21. Accordingly, there can be prevented an increase in the likelihood of a paper jam, which would otherwise be caused when a new member is provided in the recording apparatus.
By means of such a structure, the recording paper 4 is stably supported by the flat tops 6, and recording of an image on the recording paper 4 without leaving a margin on the top end 7 and/or the bottom end 13 can be executed by use of a single center hole 25.
In the area of the platen 3 opposite the nozzle array 2a assigned to one color, a second hole 26 is formed at an upstream position with respect to the secondary scanning direction, and a first hole 27 is formed at a downstream position with respect to the same. Further, in the area of the platen 3 opposite the nozzle array 2b assigned to another color, a second hole 27 (i.e., the first hole 27 acting as a second hole) is formed at an upstream position with respect to the secondary scanning direction, and a first hole 28 is formed at a downstream position with respect to the same. Further, in the area of the platen 3 opposite the nozzle array 2c assigned to still another color, a second hole 28 is formed at an upstream position with respect to the secondary scanning direction, and a first hole 29 is formed at a downstream position with respect to the same. As mentioned above, the first hole 27 of the nozzle array 2a acts also as the second hole 27 of the nozzle array 2b. Similarly, the first hole 28 of the nozzle array 2b acts also as the second hole 28 of the second nozzle array 2c.
The ink droplets which have been squirted outside the top end 7 of the recording paper 4 from the nozzle arrays 2a, 2b, and 2c of respective colors when an image is recorded on the recording paper 4 without leaving a margin on the top end 7 are guided to the first hole 27. Similarly, the ink droplets which have been squirted outside the bottom end 4′ of the recording paper 4 from the nozzle arrays 2a, 2b, and 2c of respective colors when an image is recorded on the recording paper 4 without leaving a margin on the bottom end 4′ are guided to the second hole 26.
Even in a case where a plurality of color nozzles are arranged in a vertical column, the color nozzles are assigned respective hole pairs; that is, a pair consisting of the first hole 27 and the second hole 26, a pair consisting of the first hole 28 and the second hole 27, and a pair consisting of the first hole 29 and the second hole 28. As in the case of a recording head having color nozzles arranged horizontally, the recording head can record an image on either the top end 7 or the bottom end 4′ of the recording paper 4 without leaving a margin.
As mentioned above, images of three colors can be readily recorded on the recording paper 4 without leaving a margin.
There will now be described an embodiment of the present invention, in which an image is recorded on a recording medium without leaving a margin on either side of the recording medium, by reference to
In the area of the platen with which a recording medium 50 is to come into contact, a plurality of protuberances 14 are formed at intervals with respect to the primary scanning direction of a recording head. Each of the protuberances 14 is formed into an elongated shape with respect to the direction in which the recording medium 50 is to be transported. The protuberance 14 has a flat top 10, and the top 10 defines a clearance between the recording medium 50 which is to be transported over the top 10 in the secondary scanning direction and the recording head; i.e., a paper gap. A sloping surface 11 is provided on and adjacent to the upstream side of the top 10 of the protuberance 14, and the top end of the recording medium 50 fed from an upstream direction is guided over, while remaining in contact with, the sloping surface 11, to thereby reach the top 10. Reference numeral 12 designates a sloping surface provided on the downstream side of the top 10 of the protuberance 14.
As shown in
In the present embodiment, of the plurality of protuberances 14, protuberances 14a formed in the vicinity of either side of the platen in the primary scanning direction are characterized in that, as shown in
The through holes 1, 2, 3, and 4 and the way in which the ink-absorbing material 7 is fitted into the through holes 1 through 4 will now be described by reference to
As mentioned above, the platen supports a recording medium from below and holds the recording medium in position relative to an ink-jet recording head (not shown), when an image is recorded on the recording medium disposed opposite the recording head while the ink-jet recording head—on which nozzles are arranged in the secondary scanning direction of the recording medium—is being moved so as to scan in the primary scanning direction. The through holes 1, 2, 3, and 4 are located at positions on the platen corresponding to the sides (the reference side and the other side) of recording media of various sizes to be moved in the secondary scanning direction. The through holes 1 through 4 are formed so as to extend beyond either side of the recording medium. Further, the through holes 1 through 4 are formed as ink receiver holes whose openings are formed to be longer than the nozzle array in the secondary scanning direction. As shown in
The ink-absorbing material 7 is provided in the respective through holes 1 through 4. In the through holes 1 through 4, the ink-absorbing material 7 is disposed in the vicinity of the opening opposite the recording head such that the top surface of the ink-absorbing material 7 is situated below the opening. In the present embodiment, first removal stoppers 30, 31, and 32 are provided along the interior edge of the recording-head-opposing opening of each of the through holes 1 through 4 and function to prevent removal of the ink-absorbing material 7 toward the recording head. As shown in
In the present embodiment, a pair of second removal stoppers 8 is provided in each of the through holes 1 through 4 for preventing removal of the ink-absorbing material 7 toward the recording head. The second removal stoppers 8 correspond to a pair of angularly-raised lines which are formed opposite each other on interior walls of the through hole in the longitudinal direction thereof. The end of the raised line 8 opposing the reverse side of the platen is tapered into a taper 9, to thereby facilitate insertion of the ink-absorbing material 7.
Based on the foregoing description, the configuration of the ink-jet recording apparatus for recording data on a recording medium without leaving margin on either side will now be described, by reference to
The control section 52 has two operation modes; i.e., a first operation mode and a second operation mode. In the first operation mode, the control section 52 expands recorded data and records the data in a recording region set inside either side of the recording medium of any of predetermined sizes (a postcard size, an A4-size, or a like size). In a second operation mode, the control section 52 expands the same recorded data and records the data within a record region which extends beyond either side of the recording medium 50 of the same size and is positioned inside a non-reference-side edge 54 of the recording medium 50 within the corresponding one of the through holes 1, 2, 3, and 4. In a case where data are recorded on the recording medium 50, the control section 52 operates according to the second operation mode.
In the present embodiment, in the first operation mode, a certain photographic image data set can be normally recorded on the recording medium 50 of a single size while a margin is left on either side thereof. In the second operation mode, the image data set can be recorded on the recording medium 50 without a margin being left on either side thereof. In other words, since the control section 52 is provided with the first and second operation modes, a certain photographic image data set can be readily and unfailingly recorded on the recording medium 50 of a single size with or without a margin being left on either side thereof.
Since the control section 52 operates according to either the first or second operation mode for the recording medium 50 of a predetermined size, the second mode can be readily set such that the amount of image data to be produced and wasted outside either side of the recording medium 50 is sufficiently reduced. Accordingly, image data can be effectively recorded without a margin being left, by means of minimizing wastage of image data.
Here, the expression “image data” may signify either text or an image.
Further, in the ink-jet recording apparatus of the present embodiment, protuberances 14 protruding by the same distance are formed at predetermined intervals in the primary scanning direction and in an upper surface of the platen 53. When the recording head 51 records image data on the recording medium 50 while the recording medium 50 is intermittently transported in the secondary scanning direction, the platen 53 supports the recording medium 50 from below, to thereby hold the recording medium 50 in position relative to the recording head 51. The protuberances 14 enable regular generation of paper cockle, which is usually caused when the recording medium is soaked with ink, thereby rendering stable the position of the recording medium 50 in its widthwise direction. Therefore, setting of the record region for the second operation mode does not involve a necessity for taking into consideration a large positional offset of the recording paper 50 attributable to paper cockle. Accordingly, the recording region for the second operation mode can be made small, thus enabling a further reduction in the amount of image data to be wasted during a margin-free recording operation.
More specifically, in the ink-jet recording apparatus programmed with the first and second operation modes, the recording region for the second operation mode is set to be wider than the width of the recording medium by 4.5 to 5.5 mm. By virtue of such an allowance, image data can be recorded on the recording medium 50 without a margin being left on either side thereof and without being substantially influenced by a tolerance stemming from the design or manufacture of a path for transporting the recording medium 50.
In the ink-jet recording apparatus programmed with the first and second operation modes, the control section 52 reciprocally actuates the recording head 51 in the primary scanning direction. As shown in
At the time of implementation of the first and second operation modes, the control required for reciprocally moving the recording head 51 in the primary scanning direction can be facilitated. Recording throughput can be optimized in both the first and second operation modes. The control section 52 may assume a speed pattern such as that shown in
In the ink-jet recording apparatus programmed with the first and second operation modes, the ink-absorbing material 7 is provided in each of the through holes 1, 2, 3, and 4. The ink-absorbing material 7 is provided in the holes 1 through 4 such that the upper surface of the ink-absorbing material 7 is situated in the vicinity of the opening of the hole opposite the recording head.
Accordingly, the distance over which the ink droplets are squirted and wasted outside either side of the recording medium 50 can be shortened. Further, the ink-absorbing material 7, which is disposed in each of the through holes 1 through 4 such that the upper surface of the ink-absorbing material 7 is situated in the vicinity of the opening opposite the recording head, immediately captures the ink droplets, thus significantly reducing the chance of occurrence of airborne ink mist.
The operation of the recording apparatus of the present embodiment will now be described. When image data are recorded on a recording medium without a margin being left on either side thereof, by setting the range of primary scanning of the ink-jet recording head so as to extend beyond either side of the recording medium, the ink—which has been squirted from the recording head outside either side of the recording medium—is directly received by any of the through holes 1 through 4 formed in the platen, each through hole having an opening larger than the nozzle range of the recording head. Further, the ink immediately adheres to the ink-absorbing material 7 which is provided in the through holes 1 through 4 such that the upper surface of the ink-absorbing material 7 is situated in the vicinity of the entrance of the through hole. Accordingly, substantially no airborne ink mist arises. As mentioned above, even the platen of the present embodiment enables a reduction in the chance of generation of airborne ink mist, thereby diminishing the chance of both sides of a recording medium being stained with airborne ink mist.
So long as the upper surface of the ink-absorbing material 7 is situated in a position below the open entrance of each of the through holes 1 through 4, a recording medium is prevented from rubbing against the ink-absorbing material 7, which would otherwise be caused during transportation of the recording medium. Further, even if the recording medium becomes wavy and deformed for reasons of paper cockle, the recording medium can be prevented from rubbing against the upper surface of the ink-absorbing material 7.
Further, the first removal stops 30, 31, and 32 are provided along the open edge of each of the through holes 1 through 4 opposite the recording head, in order to prevent removal of the ink-absorbing material 7 toward the recording head. Since the first removal stops 30, 31, and 32 securely hold the upper surface of the ink-absorbing material 7, generation of airborne ink mist can be stably prevented. Further, rubbing between the upper surface of the ink-absorbing material 7 and a recording medium to be transported and rubbing between the recording medium and the ink-absorbing material 7 stemming from paper cockle can be diminished thoroughly.
Since the first removal stops 30, 31, and 32 are formed along the open edge of each of the through holes 1 through 4 opposite the recording head, the first removal stops 30, 31, and 32 can be readily formed integrally with the platen. The thus-formed removal stops can exert a removal effect by means of a simple structure.
The second removal stoppers 8 or 28 provided in each of the through holes 1, 2, 3, and 4 limit removal of the ink-absorbing material 7 in the direction opposite the recording head. The second removal stoppers 8 or 28 unfailingly prevent removal of the ink-absorbing material 7 in the direction opposite the recording head. In cooperation with the first removal stoppers 30, 31, and 32, the second removal stoppers 8 or 28 can securely hold the ink-absorbing material 7 within the through holes 1, 2, 3, and 4.
In one embodiment, the second removal stoppers 8 are formed in raised lines on the interior surface of each of the through holes 1, 2, 3, and 4, the lines aligned in the longitudinal direction thereof. Such a structure of the second removal stopper 8 enables insertion of the ink-absorbing material 7 into each of the through holes 1, 2, 3, and 4 by means of pushing only the ink-absorbing material 7. Further, the second removal stoppers 8 can be readily formed integrally with the through holes.
In another embodiment, the second removal stoppers 28 are formed in the shape of the steps 28 along the bottom edge of each of the through holes opposite the recording head. The step-shaped removal stoppers 28 unfailingly prevent removal of the ink-absorbing material 7 through employment of a simple structure and can be readily formed integrally with the through holes.
In the present embodiment, when image data are recorded on a recording medium without leaving a margin on either side of the recording medium, the ink which has been squirted from the recording head outside either side of the recording medium directly enters any of the through holes 1, 2, 3, and 4 having openings, each opening longitudinally extending beyond the range of the recording head within which range nozzles are arranged (hereinafter referred to as a “nozzle range”). The ink then immediately adheres to the ink-absorbing material 7 laid on the tilt section 35 provided in any of the through holes 1, 2, 3, and 4. Accordingly, the chance of occurrence of airborne ink mist can be substantially obviated. Even when an ink-jet recording apparatus performs photographic-quality printing which does not involve leaving a margin on either side of the recording medium, there arises substantially no decrease in print quality of the lateral side areas of the recording medium. When the ink which has adhered to the ink-absorbing material 7 accumulates to a certain level, the ink flows over the surface of the tilt section 35 and is drained from the through holes 1, 2, 3, and 4.
In the present embodiment, as in the case of the platen shown in
Recording of image data on a recording medium without leaving a margin on the top, bottom, or either side of the recording medium can be achieved by combination of the ink-jet recording apparatus which has been described at the beginning of the specification and prints image data without leaving a margin on either the top or bottom side of recording medium, and the subsequent ink-jet recording apparatus which records image data without leaving a margin on either side of a recording medium.
The structure of a paper feeder provided in the ink-jet recording apparatus according to the present invention will now be described by reference to
As shown in
The hopper 13 is provided with an edge guide 15 for limiting the position of one widthwise end of a single sheet of cut paper, such that the edge guide 15 can move across the surface of the hopper 13 in its transverse direction. The side wall 9 of the two side walls 8 and 9 (i.e., the side wall situated near the viewer in
In
The roll-of-paper holder 25 which can be removably attached to the sheet feeder 3 will next be described. As shown in
A roll-of-paper loading region 30 is formed between the two arms 29, and a receiving section 33 is formed in the interior surface of the free-end portion of each arm 29. As shown in an enlarged view of
A rotary pin 41 formed on either side of a roll support shaft 39 is finally fitted into the small-pin-receiving section 37 by way of the receiving portion 35. The roll support shaft 39 is retained by the receiving sections 33 so as to be rotatable about its axis and stationary with respect to the horizontal direction.
As shown in
A cutter travel channel 26 for receiving a cutter for separating the roll of paper 19 is formed in the roll-of-paper holder 25. The cutter travel channel 26 acts as a guide channel when the roll of paper 19 is cut through use of a cutter (not shown). So long as the user causes the cutter to scan along the cutter travel channel 26, the roller 19 is smoothly cut along that guide channel.
The operation of the paper feeder of the first embodiment will now be described by reference to
In a case where the roll of paper 19 is used, the roll support shaft 39 is inserted into the roll of paper 19 in an unrestricted manner (i.e., in a state in which the roll of paper 19 is freely rotatable relative to the roll support shaft 39). The rotary pin 41 provided on either side of the roll support shaft 39 is fitted into the corresponding shaft bearing 37 of the roll-of-paper holder 25, thus setting the roll of paper 9 into the roll-of-paper holder 25. The removable engagement section 31 of the roll-of-paper holder 25 is then fitted into the removable receiving section 21 of the sheet feeder 3, thus attaching the roll-of-paper holder 25 to the sheet feeder 3.
The roll of paper 19 is rolled out from the roll-of-paper holder 25, and the leading edge of the roll of paper 19 is aligned with the hopper 13 of the sheet feeder 3 and set in the paper transport path of the sheet feeder 3. The edge guide 15 is moved according to the width of the roll of paper 19, to thereby prevent the roll of paper 19 from wobbling in the horizontal direction (see
Paper is unwound from the roll of paper 19 by means of the feeding force exerted by a paper feed roller (not shown). Since the roll of paper 19 is retained by the roll-of-paper holder 25 in an unrestricted manner, the roll of paper 19 stretched by the paper feed roller is excessively rotated by means of inertial force. As a result, paper is excessively unwound, whereupon slack arises in the paper. The slack absorbs back tension, which would otherwise be applied to the paper when the roll of paper 19 is delivered to the print section, thus improving the accuracy of paper feeding operation.
The paper feeder according to the second embodiment will now be described by reference to
As shown in
The removable engagement section 55 of the paper support 51 can also be attached to the removable receiving section 21 of the sheet feeder 3. In the second embodiment, the roll-of-paper holder 25 is formed so as to be able to connect with the sheet feeder 3, by utilization of the removable receiving section 21 of the sheet feeder 3 for removably receiving the paper support 51. In other words, the removable receiving section 21 formed in the sheet feeder 3 can serve as an attachment point for both the roll-of-paper holder 25 and the paper support 51.
A withdrawable extension support 59 is provided on the reverse side of the upper end of the paper support 51. In a case where a single sheet of cut paper extends beyond the paper support 51, the extension support 59 is withdrawn supplementally, thus supporting the entirety of the single sheet of cut paper.
Next, the operation of the paper feeder according to the second embodiment of the invention shown in
In a case where a long single sheet of cut paper is used for printing, the roll of paper 19 is detached from the roll-of-paper holder 25, and the removable engagement section 55 of the paper support 51 is attached to the removable receiving section 53 of the roll-of-paper holder 25 (see
In a case where use of a roll of paper is not expected for a while, the roll-of-sheet holder 25 is removed from the sheet feeder 3, and the removable engagement section 55 of the paper support 51 can be attached directly to the removable receiving section 21 of the sheet feeder 3.
In the paper feeder of the present embodiment, the roll-of-paper holder 25 is structured so as to be attached to the sheet feeder 3, thus rendering the roll-of-paper holder 25 compact and improving the ease of use thereof. Accordingly, the ink-jet recording apparatus can be prevented from becoming bulky.
The roll-of-sheet holder 25 is attached to the sheet feeder 3 such that a roll of sheet to be retained is situated above the upper end of the sheet feeder and in substantially an extension of a paper transport path of the sheet feeder 3. As a result, a roll of paper and a sheet of cut paper can be transported over a single common path, thus reducing variations in recording quality. Further, the entirety of the roll-of-paper holder 25 can be readily made compact.
As a result of the removable receiving section 21 of the sheet feeder 3 being arranged so as to be shared between the roll-of-paper holder 25 and the paper support 51, the structure to be used for removal attachment can be simplified. Further, so long as the paper support 51 is detached from the removable receiving section 21 of the sheet feeder 3 and the roll-of-paper holder 25 is attached to the removable receiving section 21, data can be recorded (printed) on a roll of paper. Conversely, so long as the paper support 51 is attached to the removable receiving section 21 of the sheet feeder 3, a sheet of cut paper which is long in the feeding direction can be stably transported while the end of the paper is supported by the paper support 51.
The removable receiving section 53 for receiving the paper support 51 is formed in the roll-of-paper holder 25. While the roll-of-paper holder 25 is attached to the sheet feeder 3, the paper support 51 can be attached to the roll-of-paper holder 25. Even while the roll-of-paper holder 25 remains attached to the sheet feeder 3, the paper support 51 can be additionally attached to the roll-of-paper holder 25. As a result, even when a roll of paper is not used, a single sheet of cut paper which is long in the feeding direction can be used by means of assistance of the paper support 51 and without involvement of removal of the roll-of-paper holder 25, thus improving the ease of use of the paper feeder.
A method of feeding paper in the ink-jet recording apparatus of the present invention will now be described by reference to
The outline of a system for feeding a singe sheet of cut paper will be described by reference to
The paper feed roller 2 has a D-shaped side cross section and comprises a circular-arc section 2a which is to be brought into contact with the single sheet of cut paper Ps, and a linear section 2b which departs from the single sheet of cut paper Ps. At least the surface of the paper feed roller 2 is formed from high-friction material, such as rubber. During a single rotation of the paper feed roller 2 in which the circular arc section 2a remains in contact with the separation pad 3, one single sheet of cut paper Ps is fed to a conveyor roller 4 by way of a paper guide 8.
After skews have been eliminated from the single sheet of cut paper Ps by means of cooperation of the conveyor roller 4 and a driven roller 5, the single sheet of cut paper is advanced by a certain length, and the single sheet of cut paper Ps is delivered to the area of a recording head 6 constituting a recording section of the recording apparatus, in accordance with recording timing. In the region of the recording head 6, data are recorded on the single sheet of cut paper Ps, and the paper Ps having the data recorded thereon is output by means of an output roller 7.
The system for feeding a roll of paper will now be described by reference to
The example paper feeder to be used with the recording apparatus of the present invention is shown in
Paper is unwound from the roll of paper PR by means of the feeding force exerted by the paper feed roller 2. Since the roll of paper PR is retained by the roll-of-paper holder 25 in an unrestricted manner, the roll of paper PR stretched by the paper feed roller 2 is excessively rotated by means of inertial force. As a result, paper is excessively unwound, whereupon slack arises in the paper. The slack absorbs back tension, which would otherwise be applied to the paper PR when the roll of paper PR is delivered to the print section, thus improving the accuracy of paper feeding operation.
In the present embodiment, the paper feed roller 2 and the conveyor roller 4 are actuated independently by corresponding motors. The motors are controlled according to a selected paper feed sequence.
A control section 40 receives print information output from a print driver of a main control section (not shown) or a like section of the recording apparatus. On the basis of determination of the print information, the control section 40 selects one from a plurality of paper feed sequences stored in the control section 40 in advance and executes the selected paper feed sequence through use of a paper feed instruction. On the basis of the result of detection of paper issued by a paper detector PE (e.g., a leading-end-of-paper detection signal or a trailing-end-of-paper detection signal), the control section 40 controls a paper feed roller drive section 41 and a conveyor roller drive section 42.
Print information comprises information (type-of-paper information) about the type of paper, such as plain paper, coated paper, an OHP sheet, glossy paper, a glossy film, or a post card; information about resolution (resolution information); and mode selection information about a feed rate, a single sheet of cut paper, a roll of paper, and feeding of paper by way of a control panel. The paper feed sequence is formed by combination of an operation for rotating the paper feed roller 2 and the conveyor roller 4 at a normal feed rate, an operation for rotating the paper feed roller 2 at a rate faster than the ordinary feed rate (i.e., a high-speed mode), and an operation for rotating, in the forward or reverse direction, the paper feed roller 2 and the conveyor roller 4 at a normal feed rate.
The control section 40 stores a first paper removal routine and a second paper removal routine. According to the first paper removal routine, there is performed an operation for outputting, to the outside of the ink-jet recording apparatus, the paper which has been fed by way of a control panel by means of causing the paper to advance. According to the second paper removal routine, there is performed an operation for outputting, to the outside of the ink-jet recording apparatus, the paper which has been fed by way of a control panel by means of causing the paper to move in reverse. After advancing the paper over a certain distance has been completed, either the first or second paper removal routine is performed in accordance with an instruction from the user. In a case where the user issues an instruction by means of actuation of a button 45 provided on the control panel, a button operation awareness section 40A gains awareness of operation of the button 45, thus determining a paper removal routine to be executed and executing the thus-determined routine. The button operation awareness section 40A gains awareness of the way of operation of an existing button (e.g., a control panel paper feed button or a control panel paper output button), the time required for the user to operate the existing button, the way of operation of a paper removal button which can be used for removing a single sheet of cut paper as well as for removing a roll of paper, the time required for the user to operate the paper removal button, operation of a single-sheet-of-paper output button, and operation of a roll-of-paper output button.
There will now be described an embodiment of the button 45.
The first and second paper removal routines will now be described by reference to diagrammatic illustrations. In the description, the expression “button” typifies buttons shown in
A specific example of paper removal will now be described.
In
After advancement of the top of the paper over a certain distance has been completed, the user operates the control panel paper feed button, whereupon the time required for the user to operate the control panel paper feed button is determined (step 100). If the button is pressed for three seconds or more, the second paper removal routine to be described later is executed (step 101). In contrast, if the button is pressed for less than three seconds, the first paper removal routine to be described later is executed (step 102).
According to the first paper removal routine of the present embodiment, the trailing end of the paper is detected through use of a paper detector, to thereby determine whether the paper is a single sheet of cut paper or a roll of paper, thus causing subsequent processing to branch. A determination as to whether or not the paper is a single sheet of cut paper or a roll of paper is made by utilization of the conveyor roller 4. If paper is detected when the conveyor roller 4 is rotated forward a predetermined number of rotations, the paper is determined to be a roll of paper. In contrast, if no paper is detected, the paper is determined to be a single sheet of cut paper.
According to the paper feed method of the present embodiment, the user instructs removal of the current paper before execution of a printing operation and after advancement of the top of the paper over a certain distance has been completed in the panel paper feed mode, thereby eliminating wastage of paper and rendering a printing operation economical. In the recording apparatus of the present embodiment, a roll of paper is set on the paper feeder through use of the hopper for use with a single sheet of cut paper, thus rendering the recording apparatus compact and easy to operate. Further, the edge guide of the hopper doubles as a guide for a roll of paper. Therefore, even if the leading edge of the roll of paper is cut obliquely, the roll of paper can be properly advanced over a certain distance in the feeding direction. Moreover, the recording apparatus yields the same advantages as those yielded by the paper feed method.
| Number | Date | Country | Kind |
|---|---|---|---|
| 11-98380 | Apr 1999 | JP | national |
| 11-98383 | Apr 1999 | JP | national |
| 11-155100 | Jun 1999 | JP | national |
| 11-277709 | Sep 1999 | JP | national |
| 11-280549 | Sep 1999 | JP | national |
| 11-342595 | Dec 1999 | JP | national |
| 2000-103652 | Apr 2000 | JP | national |
| 2000-103689 | Apr 2000 | JP | national |
This is a continuation of application Ser. No. 11/863,595 filed Sep. 28, 2007, which in turn is a continuation of application Ser. No. 11/320,598, filed Dec. 30, 2005, which is a continuation of Ser. No. 10/953,556, filed Sep. 30, 2004, which is a continuation of application Ser. No. 09/544,543 filed Apr. 6, 2000, now U.S. Pat. No. 6,964,466 issued Nov. 15, 2005. The entire disclosure of the prior applications, application number, 11/320,598, 10/953,556 and 09/544,543 is considered part of the disclosure of the accompanying continuation application and are hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11863595 | Sep 2007 | US |
| Child | 11931818 | US | |
| Parent | 11320598 | Dec 2005 | US |
| Child | 11863595 | US | |
| Parent | 10953556 | Sep 2004 | US |
| Child | 11320598 | US | |
| Parent | 09544543 | Apr 2000 | US |
| Child | 10953556 | US |
