This application is based upon and claims the benefit of priority from the corresponding Japanese Patent Application No. 2017-033152 filed on Feb. 24, 2017 and the corresponding Japanese Patent Application No. 2017-023916 filed on Feb. 13, 2017, the entire contents of which are incorporated herein by reference.
The present disclosure relates to an ink-jet recording apparatus provided with a recording portion having a recording head that ejects ink onto a recording medium such as a paper sheet.
An ink-jet recording apparatus that ejects ink and forms an image with the ink is capable of forming a high-definition image and thus has been widely used as a recording apparatus such as a facsimile, a copy machine, or a printer.
Conventionally, in an ink-jet recording apparatus, in order to prevent drying and clogging of an ejection nozzle of a recording head, typically, the recording head is kept capped in a case where printing is not scheduled to be performed for a long period of time. Furthermore, it is also common to perform a recovery process in which ink thickened in the ejection nozzle is forcibly extruded through the ejection nozzle and wiped off by a wiper. Thus, in the ink-jet recording apparatus, there are provided a recording head that ejects ink onto a recording medium, a cap unit having a cap portion that caps the recording head, and a wipe unit that performs a recovery process with respect to the recording head.
In the ink-jet recording apparatus described above, since it is required that the cap unit be moved between an opposed position opposed to the recording head and a retracted position retracted from the recording head, there are provided a horizontal movement mechanism that moves the cap unit in a horizontal direction and an ascending/descending mechanism that moves the cap unit in an up-down direction.
In a case of capping the recording head, the cap portion is disposed so as to come into tight contact with an ink ejection surface of the recording head. In a case of not capping the recording head, the cap portion is disposed at the retracted position retracted from the recording head.
The ascending/descending mechanism is composed of, for example, four pivot arms that are disposed below the wipe unit and each pivot about a lower end thereof as a fulcrum and a motor that drives the pivot arms. Two pivot arms are secured to both ends of a connection shaft, respectively, forming a pivot arm portion. Two such pivot arm portions are provided. A tip end (a swing end) of each of the pivot arms supports the wipe unit and moves the wipe unit in the up-down direction. When each of the pivot arms pivots down so as to be horizontal, the wipe unit descends to be disposed at a lowermost position, while when each of the pivot arms pivots up so as to be vertical, the wipe unit ascends to be disposed at an uppermost position.
An ink-jet recording apparatus according to a first aspect of the present disclosure is provided with a recording portion, a cap unit, a wipe unit, a lid member, a unit horizontal movement mechanism, and a unit ascending/descending mechanism. The recording portion has a recording head that ejects ink. The cap unit is capable of reciprocating between a first position that is directly below the recording portion and a second position that is retracted in a horizontal direction from the first position, and has a cap portion that caps the recording head when at the first position. The wipe unit is capable of reciprocating between the first position and the second position, and performs a recovery process with respect to the recording head when at the first position. At the second position, the lid member is disposed above the cap unit and comes into tight contact with the cap portion. The unit horizontal movement mechanism moves the cap unit and the wipe unit in the horizontal direction. The unit ascending/descending mechanism causes the cap unit and the wipe unit to ascend/descend in an up-down direction.
An ink-jet recording apparatus according to a second aspect of the present disclosure is provided with a recording portion, a cap unit, a wipe unit, a unit horizontal movement mechanism, and a unit ascending/descending mechanism. The recording portion has a recording head that ejects ink. The cap unit is capable of reciprocating between a first position that is directly below the recording portion and a second position that is retracted in a horizontal direction from the first position, and caps the recoding head when at the first position. The wipe unit is capable of reciprocating between the first position and the second position, is disposed below or above the cap unit when at the second position, and performs a recovery process with respect to the recording head when at the first position. The unit horizontal movement mechanism moves the cap unit and the wipe unit in the horizontal direction. The unit ascending/descending mechanism causes the cap unit and the wipe unit to ascend/descend in an up-down direction. The unit ascending/descending mechanism includes a plurality of wires each having one end thereof attached to a lower unit that is one of the cap unit and the wipe unit which is disposed below the other when at the second position, a pair of winding pulleys to which the other end of each of the plurality of wires is attached and that wind the plurality of wires, and a winding drive source that drives the pair of winding pulleys to rotate. The pair of winding pulleys rotate forward/backward, thus causing the lower unit to ascend/descend.
Still other objects of the present disclosure and specific advantages provided by the present disclosure will be made further apparent from the following description of an embodiment.
With reference to the appended drawings, the following describes an embodiment of the present disclosure.
With reference to
Furthermore, the printer 100 is provided inside with a first paper sheet conveyance path 4a. When it comes to the paper feed cassette 2a, the first paper sheet conveyance path 4a is positioned on the upper right side that is a paper feed direction thereof. The paper sheet P fed out from the paper feed cassette 2a is conveyed perpendicularly upward along a side surface of the printer main body 1 via the first paper sheet conveyance path 4a.
A registration roller pair 13 is provided at a downstream end of the first paper sheet conveyance path 4a with respect to the paper sheet conveyance direction. Moreover, a first conveyance unit 5 and a recording portion 9 are disposed immediately near a downstream side of the registration roller pair 13 in the paper sheet conveyance direction. The paper sheet P fed out from the paper feed cassette 2a passes through the first paper sheet conveyance path 4a to reach the registration roller pair 13. While correcting oblique feeding of the paper sheet P, the registration roller pair 13 feeds out the paper sheet P toward the first conveyance unit 5 in accordance with timing of an ink ejection operation carried out by the recording portion 9.
A second conveyance unit 12 is disposed on a downstream side of the first conveyance unit 5 with respect to the paper sheet conveyance direction (a left side in
A de-curler portion 14 is provided on a downstream side of the second conveyance unit 12 with respect to the paper sheet conveyance direction and in a neighborhood of a left side surface of the printer main body 1. The paper sheet P on which the ink has been dried at the second conveyance unit 12 is sent to the de-curler portion 14 where a curl generated in the paper sheet P is corrected.
A second paper sheet conveyance path 4b is provided on a downstream side of the de-curler portion 14 with respect to the paper sheet conveyance direction (an upper side in
An inversion conveyance path 16 for performing double-sided recording is provided in an upper portion in the printer main body 1 and above the recording portion 9 and the second conveyance unit 12. In a case of performing double-sided recording, the paper sheet P on which recording with respect to a first surface thereof has been completed and that has passed through the second conveyance unit 12 and the de-curler portion 14 is sent to the inversion conveyance path 16 via the second paper sheet conveyance path 4b. A conveyance direction of the paper sheet P thus sent to the inversion conveyance path 16 is switched for recording with respect to a second surface thereof, and the paper sheet P is sent rightward by passing through the upper portion of the printer main body 1. Then, via the first paper sheet conveyance path 4a and the registration roller pair 13, with the second surface faced upward, the paper sheet P is sent again to the first conveyance unit 5.
Furthermore, a wipe unit (a lower unit) 19 and a cap unit (an upper unit) 50 are disposed below the second conveyance unit 12. When carrying out after-mentioned purging, the wipe unit 19 horizontally moves to below the recording portion 9, where the wipe unit 19 wipes off ink extruded through an ejection nozzle of a recording head and collects the ink thus wiped off. When capping an ink ejection surface of the recording head, the cap unit 50 horizontally moves to below the recording portion 9 and further moves upward to be mounted to a lower surface of the recording head.
As shown in
As shown in
The recording heads 17a to 17c constituting each of the line heads 11C, 11M, 11Y, and 11K are supplied with ink of one of four colors (cyan, magenta, yellow, and black) stored in ink tanks (not shown), respectively, so as to correspond to respective colors of the line heads 11C, 11M, 11Y, and 11K.
In accordance with image data received from an external computer or the like in the form of a control signal from a control portion 110 (see
Furthermore, in order to prevent poor ink ejection due to drying or clogging of the recording heads 17a to 17c, purging is carried out in which ink increased in viscosity in the ejection nozzles 18 of the recording heads 17a to 17c is extruded through the ejection nozzles 18, thus preparing for a next printing operation. In the purging, at a start of printing after a long-term shutdown, such ink is ejected through all of the ejection nozzles 18, and in an interim between printing operations, such ink is ejected through some of the ejection nozzles 18 that have an ink ejection amount of not more than a set value.
Next, a detailed description is given of a structure in a vicinity of the cap unit 50 and the wipe unit 19.
As shown in
The first conveyance unit 5 is configured to be ascendible/descendible in an up-down direction by a conveyance ascending/descending mechanism (not shown) composed of an ascending/descending drive source, a gear train, and so on. At a time of a printing operation, the first conveyance unit 5 is disposed at a raised position (a position shown in
As shown in
At a time of a printing operation and a time of a recovery operation, the cap unit 50 is disposed at the second position (the position shown in
As shown in
The cap portions 53 are disposed at positions corresponding to the recording heads 17a to 17c. With this configuration, as shown in
As shown in
At a time of a printing operation, the wipe unit 19 is disposed at the second position. The wipe unit 19 is configured so that, at a time of a recovery operation and a time of a capping operation, it moves upward at the first position (the position shown in
As shown in
Rail portions 41a and 41b are formed at end edges of an upper surface of the support frame 40, which are opposed to each other in an arrow AA′ direction. Rollers 36 provided respectively at four corners of the wiper carriage 31 come into contact with the rail portions 41a and 41b, and thus the wiper carriage 31 is supported so as to be slidable in the arrow BB′ direction with respect to the support frame 40.
A wiper carriage movement motor 45 for moving the wiper carriage 31 in the horizontal direction (the arrow BB′ direction) and a gear train (not shown) that is meshed with the wiper carriage movement motor 45 and rack teeth (not shown) of the wiper carriage 31 are mounted to an outer side of the support frame 40. The wiper carriage movement motor 45 rotates forward/backward, thus causing the gear train to rotate forward/backward, so that the wiper carriage 31 reciprocates in the horizontal direction (the arrow BB′ direction).
The wipers 35a to 35c are each an elastic member (for example, a rubber member made of EPDM) for wiping off ink extruded through the ejection nozzles 18 of each of the recording heads 17a to 17c. From a substantially perpendicular direction, the wipers 35a to 35c are brought into pressure contact with a wiping start position on an outer side of the nozzle region R (see
Four wipers 35a are arranged at substantially regular intervals, and similarly, four wipers 35b and four wipers 35c are also arranged at regular intervals. The wipers 35a and the wipers 35c are arranged at positions corresponding to the recording heads 17a and the recording heads 17c (see
An ink collection tray 44 for collecting waste ink wiped off from the ink ejection surface F by the wipers 35a to 35c is disposed on the upper surface of the support frame 40. An ink discharge hole (not shown) is formed at a substantially middle portion on the ink collection tray 44, and tray surfaces 44a and 44b on both sides with respect to the ink discharge hole are inclined downward toward the ink discharge hole. Waste ink that has been wiped off from the ink ejection surface F by the wipers 35a to 35c and has dropped on the tray surfaces 44a and 44b flows toward the ink discharge hole (not shown). After that, by passing through an ink collection path (not shown) connected to the ink discharge hole, the waste ink is collected in a waste ink collection tank (not shown).
Furthermore, as shown in
The carriage 80 is composed of a carriage bottom plate 81 (see
As shown in
The wire 61a extends from the winding pulley 62 and is mounted to a lower portion of the wipe unit 19 in an arrow A′ direction via the pulley 63a. The wire 61b extends from the winding pulley 62 and is mounted to a lower portion of the wipe unit 19 in the arrow A direction via the pulleys 63a and 63b. One each of the wires 61a and 61b, the winding pulley 62, and the pulleys 63a and 63b is provided on each of both sides in the arrow BB′ direction (on a forward side and a depth side with respect to a plane in
As shown in
Furthermore, as shown in
In a state where the wipe unit 19 has descended at the second position (a state shown in
As shown in
Furthermore, at the second position, there is provided a lid member 90 that, in a state where the wipe unit 19 and the cap unit 50 are not connected to each other (a state at times other than a time of a capping operation (a time of a printing operation and a time of a recovery operation)), comes into tight contact with the cap portions 53 of the cap unit 50 so as to protect the cap portions 53. The lid member 90 is formed of a plate made of SUS (stainless steel), a resin, or the like. The lid member 90 comes into tight contact with the cap portions 53 from above, thus preventing a foreign substance such as dust or paper powder from adhering to an upper surface of each of the cap portions 53 (a surface thereof that comes into tight contact with the ink ejection surface F).
As shown in
Lid support pins 124 that are inserted into penetration holes 92 of the lid member 90 are mounted to a portion of the main body stay 120 in the arrow A direction. The penetration holes 92 are slightly movable in the up-down direction with respect to the lid support pins 124, respectively. The lid support portions 91a are engaged with edge portions of the insertion holes 120a, respectively, and edge portions of the penetration holes 92 are engaged with lower portions of the lid support pins 124, respectively, and thus the lid member 90 is supported to the main body stay 120.
Furthermore, a plurality of rollers 125 are rotatably mounted to each of both ends of the lid member 90 in the arrow BB′ direction.
As shown in
Furthermore, in each of the tray side plates 52 of the cap unit 50, at a position below the cutout 57a, there are formed each of a plurality of opening holes 52b that slidably guides a push-up piece (a separation member) 58 in the up-down direction and an insertion hole 52c into which an upper portion of the push-up piece 58 is inserted.
The push-up piece 58 is provided in the cap unit 50 so as to be movable in the up-down direction. Furthermore, the purpose of providing the push-up piece 58 is to push up the lid member 90 so that the lid member 90 is separated from the cap unit 50 when the cap unit 50 is moved from the second position to the first position. As shown in
As shown in
On the other hand, as shown in
The carriage 80 (see
In a state where the cap unit 50 is disposed at the first position, the lid member 90 has slightly moved downward and is supported to the main body stay 120. When, in this state, the cap unit 50 is horizontally moved in the arrow A direction from the first position toward the second position, as shown in
Next, a description is given of an operation of mounting the cap unit 50 to the recording heads 17a to 17c in the printer 100 of this embodiment (a capping operation). A capping operation and a recovery operation described below are carried out by controlling operations of the recording heads 17a to 17c, the wipe unit 19, the unit ascending/descending mechanism 60, the unit horizontal movement mechanism 85, the conveyance ascending/descending mechanism, various drive sources, or the like based on a control signal from the control portion 110 (see
In a case of capping the recording heads 17a to 17c with the cap unit 50, as shown in
Then, by the unit ascending/descending mechanism 60 (see
After that, as shown in
Then, by the unit ascending/descending mechanism 60, as shown in
In a case of cancelling capping of the recording heads 17a to 17c (in a case of shifting to a printing operation or a recovery operation), an operation performed is reverse to the above-described operation and, therefore, is only briefly described.
At the first position, by the unit ascending/descending mechanism 60, the wipe unit 19 and the cap unit 50 are caused to descend until the wipe unit 19 is disposed at the second height position. Consequently, the cap portions 53 are separated from the ink ejection surfaces F. Then, the carriage 80 is horizontally moved from the first position to the second position, and thus the wipe unit 19 and the cap unit 50 are disposed at the second position in a state being connected to each other.
After that, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is caused to descend from the second height position to the first height position. Consequently, the connection pins 42 are pulled out from the connection holes 42, and thus the wipe unit 19 and the cap unit 50 are disconnected from each other. At this time, the connection pins 42 are separated from the push-up pieces 58, causing the push-up pieces 58 to descend, so that the lid member 90 comes into tight contact with the cap portions 53. In this manner, the state shown in
Next, a description is give of a recovery operation with respect to the recording heads 17a to 17c in the printer 100 of this embodiment. In a case of performing a recovery process with respect to the recording heads 17a to 17c by using the wipe unit 19, as shown in
Then, as shown in
Then, by the unit ascending/descending mechanism 60, the wipe unit 19 is caused to ascend as shown in
Then, prior to a wiping operation, ink is supplied to the recording heads 17a to 17c. The ink thus supplied is forcibly extruded (purged) through the ejection nozzles 18 (see
After that, a wiping operation is performed in which the ink (the purged ink) extruded on the ink ejection surfaces F is wiped off. Specifically, the wiper carriage movement motor 45 is caused to rotate forward from the state shown in
After that, by the unit ascending/descending mechanism 60 (see
Then, the carriage 80 and the wipe unit 19 disposed at the first position are horizontally moved from the first position to the second position. Consequently, the wipe unit 19 is disposed below the cap unit 50. In this manner, the recovery operation with respect to the recording heads 17a to 17c is completed.
In this embodiment, as described above, there is provided the lid member 90 that, at the second position, is disposed above the cap unit 50 and comes into tight contact with the cap portions 53. With this configuration, when the cap portions 53 are disposed at the second position, it is possible to suppress adhesion of a foreign substance such as dust or paper powder to the upper surface of each of the cap portions 53 (a portion thereof that comes into tight contact with the ink ejection surface F of each of the recording heads 17a to 17c). It is, therefore, possible to suppress a phenomenon in which, in capping the recording heads 17a to 17c, due to a foreign substance, a gap is generated between the cap portions 53 and the ink ejection surfaces F, and thus to suppress evaporation of moisture inside the cap portions 53 (the ejection nozzles 18). As a result, it is possible to suppress a failure of ink ejection caused by ink thickened in the ejection nozzles 18 and thus to suppress occurrence of an image defect.
Furthermore, as described above, there are provided the compression springs 123 that bias the lid member 90 downward. With this configuration, the lid member 90 can be reliably brought into tight contact with the cap portions 53.
Furthermore, as described above, there is provided the push-up piece 58 that, in moving the cap unit 50 from the second position to the first position, separates the lid member 90 from the cap unit 50. With this configuration, in moving the cap unit 50 from the second position to the first position, it is possible to suppress rubbing of the lid member 90 against the cap portions 53. Thus, it is possible to suppress damage to the cap portions 53 and to suppress a phenomenon in which the lid member 90 hinders horizontal movement of the cap unit 50.
Furthermore, as described above, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is caused to ascend, so that the wipe unit 19 and the cap unit 50 are connected to each other, and the wipe unit 19 pushes up the lid member 90 via the push-up pieces 58, thus separating the lid member 90 from the cap unit 50. Furthermore, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is caused to descend, so that the wipe unit 19 and the cap unit 50 are disconnected from each other, and the wipe unit 19 is separated from the push-up pieces 58, causing the push-up piece 58 to descend, so that the lid member 90 comes into tight contact with the cap portions 53. With this configuration, at a time of a recovery operation with respect to the recording heads 17a to 17c (in moving, of the cap unit 50 and the wipe unit 19, only the wipe unit 19 from the second position to the first position) and a time of a printing operation, the lid member 90 can be easily brought into tight contact with the cap portions 53. Furthermore, at a time of a capping operation (in moving the cap unit 50 from the second position to the first position), the lid member 90 can be easily separated from the cap portions 53.
Furthermore, as described above, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is caused to ascend, so that the connection pins 42 are inserted into the connection holes 52a, and the connection pins 42 push up the push-up pieces 58 via the connection holes 52a. With this configuration, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is caused to ascend, and thus the wipe unit 19 and the cap unit 50 can be easily connected to each other, and the lid member 90 can be easily separated from the cap unit 50.
Furthermore, as described above, in a state where the rollers 125 are supported on the upper surface 57c of the roller sliding rail 57 and thus the lid member 90 and the cap unit 50 are separated from each other, by the unit horizontal movement mechanism 85, the cap unit 50 and the wipe unit 19 are moved from the second position to the first position. With this configuration, in moving the cap unit 50 from the second position to the first position, the lid member 90 is prevented from rubbing against the cap portions 53, and thus the cap portions 53 can be prevented from being damaged. Furthermore, the rollers 125 rotate on the supper surface 57c of the roller sliding rail 57, and thus horizontal movement of the cap unit 50 is made smooth.
Furthermore, as described above, the inclined portion 57b inclined downward is provided at the end portion of the roller sliding rail 57 in the arrow A direction. In moving the cap unit 50 from the first position to the second position, the rollers 125 are lifted onto the upper surface 57c of the roller sliding rail 57 via the inclined portion 57b. With this configuration, in a state where the lid member 90 and the cap portions 53 are separated from each other, the cap unit 50 can be moved from the first position to the second position.
Furthermore, in this embodiment, as described above, the unit ascending/descending mechanism 60 includes the plurality of wires 61a and 61b each having one end thereof attached to the wipe unit 19, the pair of winding pulleys 62 to which the other ends of the wires 61a and 61b are attached and that wind the wires 61a and 61b, and the winding drive motor 64 that drives the winding pulleys 62 to rotate. With this configuration, unlike a conventional case where, for example, a wipe unit is caused to ascend/descend in an up-down direction by causing a pivot arm disposed below the wipe unit to pivot, it is possible to suppress an increase in torque in causing the cap unit 50 and the wipe unit 19 to ascend/descend.
Thus, there is no need to provide a gear train having a large speed reduction ratio, so that space saving can be achieved. Furthermore, it is possible to suppress breakage of a component such as a drive gear. Furthermore, there is no need to provide a worm gear, and thus it is possible to suppress a size increase of the apparatus in a height direction thereof.
Furthermore, there is no need to dispose a pivot arm below the wipe unit 19, and thus it is possible to further suppress a size increase of the apparatus in the height direction thereof.
Furthermore, as described above, in a case of moving, of the cap unit 50 and the wipe unit 19, only the wipe unit 19 from the second position to the first position, in a state where the cap unit 50 and the wipe unit 19 are disconnected from each other, the wipe unit 19 is moved from the second position to the first position by the unit horizontal movement mechanism 85. Furthermore, in a case of moving the cap unit 50 from the second position to the first position, in a state where the cap unit 50 and the wipe unit 19 are connected to each other at the second position, the wipe unit 19 and the cap unit 50 are moved from the second position to the first position by the unit horizontal movement mechanism 85. With this configuration, by using one unit horizontal movement mechanism 85 and one unit ascending/descending mechanism 60, both of the wipe unit 19 and the cap unit 50 can be easily moved in the horizontal direction and in the up-down direction.
Furthermore, as described above, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is disposed at the first height position, so that the connection pins 42 are not inserted into the connection holes 52a, and thus the cap unit 50 and the wipe unit 19 are brought to a state of being disconnected from each other. Furthermore, at the second position, by the unit ascending/descending mechanism 60, the wipe unit 19 is disposed at the second height position, so that the connection pins 42 are inserted into the connection holes 52a, and thus the cap unit 50 and the wipe unit 19 are connected to each other. With this configuration, the cap unit 50 and the wipe unit 19 can be easily connected to or disconnected from each other.
Furthermore, as described above, the wipe unit 19 includes the lift plate 47, the receiving member 48 that is disposed below the lift plate 47 and to which one end of each of the wires 61a and 61b is secured, and the compression spring 49 that is disposed between the lift plate 47 and the receiving member 48. With this configuration, at a time of a recovery operation and a time of a capping operation, the wipe unit 19 ascends to a prescribed height, and thus the compression spring 49 is compressed to absorb a winding force of the unit ascending/descending mechanism 60.
Furthermore, as described above, the unit horizontal movement mechanism 85 moves the carriage 80 integrally with the wipe unit 19 in the horizontal direction, and the unit ascending/descending mechanism 60 causes the wipe unit 19 to ascend/descend with respect to the carriage 80. With this configuration, the wipe unit 19 can be easily moved in the horizontal direction and in the up-down direction.
The embodiment disclosed herein is to be construed in all respects as illustrative and not limiting. The scope of the present disclosure is indicated by the appended claims rather than by the foregoing description of the embodiment, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.
For example, while the foregoing embodiment has shown an example in which, at the second position, the cap unit 50 is disposed above the wipe unit 19, a configuration may also be adopted in which the cap unit 50 is disposed below the wipe unit 19 at the second position. In this case, the lid member 90 may be mounted to a lower portion of the wipe unit 19. Furthermore, the wires 61a and 61b of the unit ascending/descending mechanism 60 may be mounted to the cap unit 50.
Number | Date | Country | Kind |
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2017-023916 | Feb 2017 | JP | national |
2017-033152 | Feb 2017 | JP | national |