This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2011-035963, filed on Feb. 22, 2011, the entire contents of all of which are incorporated herein by reference.
The disclosure relates to a rewritable printer using rewritable mediums.
From the past, a system in which information or data is magnetically recorded is adopted in an ID card, a pre-paid card and the like, for example. In such a magnetic recording system, however, recording of information is easy and superior but it is hard to view the recorded information directly. An owner of the card cannot visually recognize information recorded on the card.
In recent years, it has been advanced to utilize, in practice, a heat-sensitive recording medium, i.e., rewritable medium, with reversibility in which information is not only displayed on but also erased from the surface of the medium and is reprinted as well. A rewritable printer erases information printed on a rewritable medium by applying to the medium a first temperature and rewrites or reprints character information on the medium by applying to the medium a second temperature lower or higher than the first temperature.
Rewritable mediums required by users have various dimensions, in thickness, length and width, respectively and also have a paper quality different from that of papers used in general thermal printers. For example, it has relatively a high elasticity.
Therefore, according to elasticity and length dimension of a rewritable medium, it may cause trouble such that the rear edge of the medium engages in error with a printing section or the front edge thereof engages in error with a paper issue port and thus the printer stops.
Aspects of this disclosure will become apparent upon reading the following detailed description and upon reference to the accompanying drawings. The description and the associated drawings are provided to illustrate embodiments of the invention and not limited to the scope of the invention, wherein:
The present invention has been described with respect to a specific embodiment. However, the embodiment has been presented by way of example only, and is not intended to limit the scope of the present invention. Other embodiments based on the principles of the present invention should be obvious those of ordinary skill in the art. Such embodiments are intended to be covered by the claims.
Embodiment will now be described in more detail with reference to the accompanying drawings. However, the same numerals are applied to the similar elements in the drawings, and therefore, the detailed descriptions thereof are not repeated.
In general, according to an embodiment, it is to provide a rewritable printer, which conveys a rewritable medium one by one, reprints information on the rewritable medium after erasing information printed on the rewritable medium, and smoothly discharges the rewritable medium from a medium issue port thereof. The rewritable printer may include an auxiliary guide provided at the medium issue port for guiding the rewritable medium, on which information is reprinted, discharged to the outside of the printer through the medium issue port.
The rewritable printer R is configured to accommodate components or units described later in a housing 1 a rear part of which is narrower than a front part in the width dimension. A display unit 3 and an operation panel 5 are provided in line in an up-and-down direction at a side part (left hand part in
The display unit 3 is an LCD display device formed in a widthwise fashion. The operation panel 5 is equipped with a plurality of operation change over buttons and indicators respectively corresponding to the buttons. The paper issue port 7 is a slit-shaped opening formed in narrow in the up-and-down direction and in wide in the width direction. The paper issue port 7 is provided with an auxiliary guide 9 described later.
As shown in
The paper convey mechanism 17 forms a paper convey path 18 connecting the paper storing unit 11 and the paper issue port 7. Along the paper convey path 18, the erasing unit 13 and the printing unit 15 are arranged. The erasing unit 13 locates at the upper-stream side and the printing unit 15 locates at the lower-stream side of the paper convey path 18 in the paper convey direction.
The paper storing unit 11 is mainly composed of a movable lifter 11a, on which a plurality of rewritable papers P are stacked, driven by a lifter drive unit (not shown) in an up-and-down direction. The paper storing unit 11 is provided with a paper supply mechanism 19 which picks up and feeds the upper-most paper P stacked on the lifter 11a one by one to the paper convey path 18.
Rewritable papers P having various kinds of paper quality, i.e., elasticity, and of width and length dimensions, are used by users, respectively. However, a plane (width-length) dimension of the lifter 6a naturally limits width and length dimensions of rewritable paper P that is usable. Rewritable papers P have relatively a high elasticity compared with papers used in an ordinary thermal printer because operations of erasing and printing information on the rewritable paper P are performed repeatedly.
The paper supply mechanism 19 is constituted with a pickup roller 19a and a separation mechanism 19b. The pickup roller 19a applies a feeding force to the upper-most rewritable paper P on the lifter 11a. The separation mechanism 19b functions to separate, when a double-feed or an overlap-feed of the rewritable paper P occurs, the upper-most rewritable paper from a lower paper, and feed only the upper-most rewritable paper P to the paper convey path 18.
The erasing unit 13 includes a heat roller 13a and a press roller 13b. The heat roller 13a is arranged at an upper position with respect to the paper convey path 18 and has an electric heater therein to heat a rewritable paper P conveyed along the paper convey path 18. The press roller 13b is located at a lower position opposite to the upper position at which the heat roller 13a locates with respect to the paper convey path 18 and elastically contacts with the heat roller 13a with a prescribed nip to convey the rewritable paper P by the rotation with the heat roller 13a.
The printing unit 15 is arranged in the vicinity of the paper issue port 7 and is mainly composed of a line-type thermal print head 15a and a platen roller 15b that is arranged opposite to the thermal print head 15a through the paper convey path 18. The platen roller 15b is urged to elastically contact the thermal print head 15a.
The paper convey mechanism 17 includes a plurality of feed roller pairs 17a provided at a prescribed interval. Each feed roller pair 17a is oppositely arranged such that one of the roller pair is urged to elastically contact the other roller. The other roller is coupled with a known driving mechanism (not shown) to rotate and the one of the roller pair (driven roller) is rotated with the rotation of the other roller.
The paper convey mechanism 17 also includes a plurality of plate-shaped element pairs 17b oppositely arranged. A plurality of plate-shaped element pairs 17b are respectively provided between the plurality of feed roller pairs 17a along the paper convey path 18. The plate-shaped element pair 17b is formed with a sheet metal and has a gap therebetween through which a rewritable paper P passes.
In the housing 1, various sensors are provided to send detection signals to a control unit (not shown). Various sensors include an environment temperature sensor for detecting temperature of inside the housing 1 and a supply paper sensor for detecting a supply state of a rewritable paper P from the paper supply mechanism 19. Various sensors also include a paper temperature sensor for detecting temperature of the rewritable paper P passing along the paper convey path 18 and a paper alignment sensor for detecting a state of the rewritable paper P fed to the printing unit 15.
In the rewritable printer R having the above-described constructions, when a print data with a print command is received from an external device, such as a PC (Personal Computer), the control unit drive-controls each constitution part, referring to output signals from the various sensors, and executes erase and print operations based on the print data received.
Firstly, the control unit controls the lifter drive unit to move the lifter 11a upward and then the upper-most rewritable paper P contacts the pickup roller 19a. Next, the control unit drive-controls the pickup roller 19a and the separation mechanism 19b constituting the paper supply mechanism 19 and the upper-most rewritable paper P is picked up and fed to the paper convey path 18.
The rewritable paper P is conveyed along the paper convey path 18 and, at the most suitable timing arrived at the erasing unit 13, the heater of the heat roller 13a is heat-controlled. Therefore, the surface (image forming side) of the rewritable paper P passing through the erasing unit 13 is heated by the heat roller 13a and an image (information) formed on the rewritable paper P is erased due to a slow cooling of the paper P after it passes through the erasing unit 13.
Before the rewritable paper P the image on which is erased is conveyed to the printing unit 15, the control unit sends a print start control signal to the printing unit 15. The printing unit 15 performs, according to the print data received, printing with the thermal print head 15a with a thermal print system. The platen roller 15b assists the printing action by resiliently pressing the rewritable paper P against the thermal print head 15a.
If a heat temperature to the rewritable paper P in the erasing unit 13 is named as a first temperature and a heat temperature to the rewritable paper P in the printing unit 15 is named as a second temperature, the second temperature is extremely higher than the first temperature. However, there is likelihood that the second temperature is lower than the first temperature according to a condition of the rewritable paper P, such as a paper quality and the like.
In any case, printing is carried out on the rewritable paper P, according to the print data received, by cooling after heating that is executed after printing is performed on the rewritable paper P with the thermal print system. Then, after printing, the rewritable paper P is discharged to the outside through the paper issue port 7 where an auxiliary guide 9 is provided and thus is issued.
Hereafter, the rewritable paper P discharged from the paper issue port 7 and the auxiliary guide 9 attached to the paper issue port 7 are described in more detail.
As described above, the printing unit 15 is comprised of the thermal print head 15a and platen roller 15b that are arranged oppositely with respect to the paper convey path 18. In
The paper issue port 7 is opened in a slit-shape in the vicinity of the printing unit 15 such that it is provided oppositely against the paper convey path 18 between the thermal print head 15a and the platen roller 15b and has a short length in the up-and-down direction and a long length in the width direction. It is also arranged such that the upper and lower edges 7b and 7a of the paper issue port 7 form a slanted surface respectively in a spreading fashion toward the outside of the housing 1 from the inside thereof.
It is required that at least the lower edge 7a of the paper issue port 7 is slanted downwardly from the inside of the housing 1 toward the outside as a slanted surface of the lower edge. That is, the front edge of the rewritable paper P conveyed from the printing unit 15 slides along the slanted surface of the lower edge 7a of the paper issue port 7 and is discharged smoothly.
On the other hand, it may not be formed that the upper edge 7b of the paper issue port 7 has a slanted surface symmetrical with the lower edge 7a. It may be formed such that the upper edge 7b has a surface parallel with the paper convey path 18. However, it can be easy to visually recognize the discharge state of the rewritable paper P from a diagonal upper direction if the upper edge 7b is slanted upwardly toward the outside of the housing 1 from the inside thereof.
The auxiliary guide 9 is provided on the slanted surface of the lower edge 7a of the paper issue port 7. The auxiliary guide 9 is composed of a pair of lengthwise auxiliary guide plates 9a which has substantially the same width dimension as the slanted surface of the lower edge 7a of the paper issue port 7 in a paper discharge direction and respectively has a lengthwise hole 21 at one side thereof and a pair of fasteners (stopper) 9b each of which is inserted into respective lengthwise hole 21 of the auxiliary guide plate pair 9a.
A pair of screw holes is formed respectively at positions on the slanted surface of the lower edge 7a of the paper issue port 7 which are located at an equal distance from the center of the paper issue port 7 in a width direction thereof. A screw portion (not shown) formed at the chip of the stopper pair 9b is inserted into the screw hole pair, respectively. Therefore, the stopper pair 9b respectively fixes the auxiliary guide plate pair 9a on the slanted surface of the lower edge 7a of the paper issue port 7.
The auxiliary guide plate 9a is made of a thin material having elasticity, e.g., Mylar, whose surface is smooth. A thickness of the guide plate 9a is about 0.6 mm, for example. Generally, each auxiliary guide plate 9a is arranged along the slanted surface of the lower edge 7a of the paper issue port 7 and is fixed with a stopper 9b.
However, the position of the auxiliary guide plate 9a is adjustable within the length of the lengthwise hole 21 by loosening the stopper 9b. An angle and length of the guide plate 9a against and projected from the paper issue port 7 are also adjustable. The state (position and posture) of the adjusted guide plate 9a is maintained by tightening the stopper 9b.
In a state in which a portion of the auxiliary guide plate 9a projects from the paper issue port 7, there may be a chance that the rewritable paper P locates on the projected portion of the auxiliary guide plate 9a. At this time, the auxiliary guide plate 9a has a flexibility to be elastically deformed when the center of gravity of the rewritable paper P is applied on the projected portion thereof.
The paper issue port 7 is not necessarily equipped with a pair of auxiliary guide plates 9a as described above. The auxiliary guide 9 may have one guide plate or more than two guide plates. As is described later, however, to be able to make more fine adjustment, it is preferable to have a pair of auxiliary guide plates as shown in
In a rewritable printer R of this kind, before a rewritable paper P is practically issued, it is preferable to conduct a test operation such that a rewritable paper P to be used is conveyed along the paper convey path 18 and is discharged from the paper issue port 7 without printing to confirm whether or not the rewritable paper P is smoothly discharged.
The rewritable paper P can be smoothly discharged as shown in a chain double-dashed line in
A further explanation is given below in relation to discharge of the rewritable paper P from the paper issue port 7. A rotation-contact position at which the thermal print head 15a of the printing unit 15 contacts the platen roller 15b is apart from an inner wall surface of the housing 1 where the paper issue port 7 is formed by a prescribed amount, e.g., 30˜40 mm, as shown in
However, as particularly shown in
At this point, the auxiliary guide 9 does not exert any guide action on the rewritable paper P. On the other hand, if the auxiliary guide 9 is not furnished, according to the elasticity and the length dimension of the rewritable paper P, it may occur that conveying of the rewritable paper P stops at a position that the rear edge Pa of the rewritable paper P goes over the rotation-contact position.
As shown in
At this moment, position of the center of gravity G of the rewritable paper P1 passes over the upper-most point M of the slanted surface of the lower edge 7a. However, in this state, the restoring force of the rewritable paper P1 by its elasticity matches with the paper conveying force of the paper convey mechanism 17 and thus the front edge Pb of the rewritable paper P1 cannot be released from the contact state with the slanted surface of the lower edge 7a of the paper issue port 7: As a result, the rewritable paper P1 maintains its deformed posture as shown in
Therefore, the rewritable paper P1 conveyed stops at a position between the printing unit 15 and the paper issue port 7. At this state, since the paper convey mechanism 17 continuously operates, a succeeding rewritable paper P2 is conveyed to the printing unit 15. Finally, as shown in
Then, as shown in
In any case, at a moment that the rewritable paper P1 early conveyed stops, an accidental state between the rewritable paper P1 and the rewritable paper P2 succeedingly conveyed is maintained as long as the paper convey mechanism 17 does not stop promptly. Therefore, the paper convey is stopped and rewritable papers P1 and P2 should be eliminated.
If the above-described state or a state similar thereto occurs at the test operation even if the auxiliary guide 9 is furnished, following procedures are taken.
As shown in
As shown in
However, in this case, the front edge Pb of the rewritable paper P1 gets on the slanted surface of the lower edge 7a of the paper issue port 7 through the auxiliary guide plate pair 7a. The auxiliary guide plate pair 9a has a smooth surface and is arranged on the slanted surface of the lower edge 7a of the paper issue port 7. Therefore, the front edge Pb of the rewritable paper P1 slides along the auxiliary guide plate pair 9a smoothly.
Since the whole rewritable paper P1 moves diagonal-downward along the surface of the auxiliary guide plate pair 9a on the slanted surface of the lower edge 7a, the rear edge Pa thereof goes away by some extent from the rotation-contact position T between the thermal print head 15a and the platen roller 15b. Concurrently, the front edge Pb of the rewritable paper P1 on the auxiliary guide plate pair 9a goes beyond the lower-most point N that represents the front edge of the slanted surface of the lower edge 7a and thus gets on only the auxiliary guide plate pair 9a.
As shown in
The rewritable paper P1 rapidly goes further downward, and finally falls down from the paper issue port 7 smoothly. At this moment, a rewritable paper P2 conveyed next to the paper P1 positions at a prescribed interval to the rewritable paper P1 and the rewritable paper P2 does not collide with the preceding rewritable paper P1. Thus no trouble occurs.
It should be avoided that the position, the projection-length and the projection-angle of the auxiliary guide plate pair 9a are determined only by one time trial conveyance. It is recommended that a trial conveyance for the rewritable paper is repeatedly performed by changing, step by step, such adjustable items of the auxiliary guide plate pair 9a to determine the position and posture of the auxiliary guide plate pair 9a that can discharge a rewritable paper smoothly.
Accordingly, the auxiliary guide plate pair 9a has lengthwise holes 21 and the stopper pair 9b is inserted into the lengthwise holes 21 of the guide plate pair 9a respectively to adjust the position and posture of the auxiliary guide plate pair as described above.
As described above, even if rewritable papers have various kinds of elasticity and length dimension, it can be discharged surely from the paper issue port 7 with the auxiliary guide and no collision occurs between a rewritable paper P1 and a succeeding rewritable paper P2 conveyed one by one along the paper convey path 18 to maintain a smooth conveyance.
The present invention has been described with respect to specific embodiments. However, these embodiments have been presented by way of example only, and are not intended to limit the scope of the present invention. Other embodiments based on the principles of the present invention should be obvious those of ordinary skill in the art. Such embodiments are intended to be covered by the claims.
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