JP4417739B2 - Roll-type printing paper transport device - Google Patents

Description

  The present invention relates to a configuration of a roll-shaped printing paper transport unit that transports a roll-shaped paper.

  2. Description of the Related Art Conventionally, in a roll-shaped printing paper transport device, when transporting a printing paper wound in a roll, an impact load is applied to the roll paper transporting means due to the inertial load of the printing paper wound in a roll. There was a problem that the feed amount was disturbed. In order to improve this, there has been a case where the impact load generated during the conveyance of the printing paper is reduced by imparting elasticity to the printing paper tensioned by the buffer roller. There is "Japanese Patent Laid-Open No. 11-246093" as such a conventional example.

A conventional example "Japanese Patent Laid-Open No. 11-246093" will be described with reference to FIG. The roll paper supply scroller is provided with a buffer roller (103) having a length that substantially covers the paper width in a direction across the path in a paper conveyance path between the roll paper supply scroller (101) and a platen (not shown). The substantially entire area in the width direction of the drawer portion of the roll paper (102) drawn out from (101) is stretched in a U shape on the buffer roller (103) and supplied onto a platen (not shown). The buffer roller (103) is supported so as to be movable in parallel in the front-rear direction, and the buffer roller (103) is urged in a forward direction in which tension is applied to the drawer portion of the roll paper (102). .
Japanese Patent Laid-Open No. 11-246093

  As described above, in the prior art, the impact load generated during the conveyance of the printing paper is reduced by imparting elasticity to the printing paper tensioned by the buffer roller.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive roll-shaped printing paper conveyance device while simplifying the structure and enabling easy attachment / detachment to / from printing paper.

In order to achieve the above object, according to the present invention, a paper winding shaft that rotatably holds a printing paper wound in a roll shape as a printing medium, and the printing paper is conveyed in both forward and reverse directions in the longitudinal direction. And a driving means for driving the paper winding shaft and the feed roller, and a transmission means for transmitting the forward and reverse bidirectional power of the driving means to the paper winding shaft and the feed roller. In the roll-shaped printing paper conveyance device, the paper conveyance speed by the paper winding shaft is configured to be lower than the paper conveyance speed by the feed roller, and a slip clutch means is provided between the transmission means and the paper winding axis. To do.

  According to the present invention, without providing a buffer roller, a buffer spring, and a member associated therewith, the inertia load of the print paper wound around the feed roller is not applied, and the feed roller and the print paper Since the grip load, paper transport motor, and transmission means are not subjected to the impact load that occurs when transporting printing paper, printing paper can be fed accurately, and paper feed accuracy is improved even when performing overlay printing in color printing. Print quality. Further, it is possible to obtain a roll-shaped printing paper transport device that has a simple structure, is inexpensive and reliable, and is easy to attach and detach printing paper.

  A paper winding shaft for rotatably holding a printing paper wound in a roll shape as a printing medium, a feed roller for transporting the printing paper in both forward and reverse directions in the longitudinal direction, the paper winding shaft, In a roll-shaped printing paper transport device having a driving means for driving a feed roller and a power transmission means for transmitting the power of the driving means to the paper winding shaft and the feed roller, the paper transport speed by the paper winding shaft is fed. A slip clutch means is provided between the transmission means and the paper winding shaft, and the speed is lower than the paper transport speed by the roller.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an appearance of a roll paper printing apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the paper holder unit 2 of the roll paper printing apparatus shown in FIG. 1 is opened. FIG. 3 is a main cross-sectional view showing the state of the main cross section of the roll paper printing apparatus shown in FIG. FIG. 4 is an operation explanatory diagram showing a state in which the print head 6 can print in the roll paper printing apparatus shown in FIG. FIG. 5 is an operation explanatory view showing the operating principle of the present invention and showing a state in which the printing paper is sent out when the printing paper wound in a roll shape has the maximum diameter. FIG. 6 is an operation explanatory diagram illustrating a state in which the printing paper is wound when the printing paper wound in a roll shape has the maximum diameter. FIG. 7 is an operation explanatory view showing a state in which the printing paper is sent out when the printing paper wound in a roll shape has a minimum diameter. FIG. 8 is an operation explanatory diagram illustrating a state in which the printing paper is wound when the printing paper wound in a roll shape has a minimum diameter.

  A schematic configuration of a roll paper printing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, a paper holder unit 2 is attached to the frame 1 so that the printing paper 8 and the ink ribbon 19 can be easily replaced. Further, the paper holder unit 2 is provided with a paper discharge port 2a, and a paper receiving pocket 4 for receiving cut scraps of the print paper 8 discharged from the paper discharge port 2a is attached to be openable and closable. As shown in FIG. 2, the printing paper 8 and the ink ribbon 19 can be easily attached and detached by opening the paper holder unit 2.

  The main configuration of the roll paper printing apparatus shown in FIG. 1 will be described with reference to FIG. A paper holder unit 2 is rotatably attached to the frame 1 by a paper holder unit shaft 2b, and can be turned between a closed state shown in FIG. 1 and an open state shown in FIG. ing. A paper winding shaft 7 is rotatably attached to the paper holder unit frame 3 constituting the frame of the paper holder unit 2, and the printing paper 8 wound in a roll shape is mounted on the paper winding shaft 7. ing. Further, the lower grip roller 9 and the upper grip roller 10 are rotatably attached to the paper holder unit frame 3 so as to sandwich the printing paper 8 passing between them. A platen 11 is rotatably mounted adjacent to the lower grip roller 9 and the upper grip roller 10.

  A feed roller 12 for conveying the printing paper 8 is rotatably mounted adjacent to the platen 11, the feed roller 12 is connected to a transmission means 22 described later, and the transmission means 22 is connected to a paper conveyance motor 21 which is a driving means. The paper transport motor 21 is connected to a control circuit (not shown). A pinch roller 13 is rotatably attached to the outer peripheral upper surface of the feed roller 12 so as to sandwich the printing paper 8 between the feed roller 12 and the pinch roller 13. A paper guide plate 14 for guiding the printing paper 8 from the feed roller 12 to the paper discharge port 2a is provided between the feed roller 12 and the paper discharge port 2a. A first roller holder 15 and a second roller holder 17 are provided with a passage for the paper 8 passing therethrough. Between the first roller holder 15 and the second roller holder 17, a curl correction roller 16 for correcting curl of the printing paper 8 is rotatably attached, and the paper guide plate 14 is a printing paper. It is formed so as to surround a part of the outer periphery of the curl wrinkle correction roller 16 in order to bend in the direction opposite to the direction of the curl 8. In this way, the curl wrinkle correction roller 16 and the paper guide plate 14 formed so as to surround a part of the outer periphery of the curl curl correction roller 16 constitute a curl wrinkle forcing means.

  The end 8a of the printing paper 8 wound around the paper winding shaft 7 is pulled out, passes between the lower grip roller 9 and the upper grip roller 10, and is wound around a part of the outer periphery of the platen 11 to feed the feed roller 12. Through the passage formed between the paper guide plate 14, the first roller holder 15, the curl correction roller 16, and the second roller holder 17 from the paper discharge port 2a. It is mounted to be discharged. The printing paper 8 with the curl when wound on the paper winding shaft 7 is formed between the paper guide plate 14, the first roller holder 15, the curl correction roller 16, and the second roller holder 17. By passing through the passage, the paper guide plate 14 formed so as to surround a part of the outer periphery of the curl correction roller 16 is bent in a direction opposite to the curl so as to correct the curl. It is configured.

  Further, an ink ribbon winding shaft 18 is rotatably attached to the paper holder unit frame 3, and an ink ribbon 19 wound in a roll shape is attached to the ink ribbon winding shaft 18. An ink ribbon winding shaft 20 is rotatably attached to the opposite side of the platen 11 from the ink ribbon winding shaft 18. The ink ribbon mounted on the ink ribbon winding shaft 18 is attached to the ink ribbon winding shaft 20. The end of 19 is pulled out and attached so that it can be wound up. Yellow, magenta, and cyan inks are sequentially and repeatedly applied to the ink ribbon 19 with predetermined areas.

  A state in which the print head 6 performs printing on the printing paper 8 will be described with reference to FIG. A print head holder unit 5 having a print head 6 fixed to the front end thereof is rotatably attached to the frame 1 by a print head holder unit shaft 5a. The print head holder unit 5 is not shown. 3, the print head 6 is rotated from the standby position shown in FIG. 3, and the print head 6 presses the platen 11 with the ink ribbon 19 and the print paper 8 overlapped as shown in FIG. 4.

  The print head 6 performs printing while transporting the print paper 8 by the first guide roller 16 and the second guide roller 19. The print paper 8 is transported as follows. The printing paper 8 extending from the paper winding shaft 7 between the lower grip roller 9 and the upper grip roller 10 is supported by the upper surface of the platen 11 and is sandwiched between the feed roller 12 and the pinch roller 13. The paper is guided by the first guide roller 16 and the second guide roller 19 so as to pass through between the paper guide plate 14 and the first roller holder 15 and the second roller holder 18 and be discharged from the paper discharge port 2a. Yes. Further, a part of the printing paper 8 is bent in a direction opposite to the curl direction by the curl correction roller 17 and the paper guide plate 14. In this state, color printing is performed by sequentially printing yellow, magenta, and cyan on the printing paper 8 while reciprocating the printing paper 8 appropriately.

A state in which the printing paper 8 is sent out when the printing paper 8 wound in a roll shape has the maximum diameter will be described with reference to FIG. A printing paper 8 is wound around the paper winding shaft 7, and one end of the printing paper 8 is pulled out and sandwiched between a feed roller 12 and a pinch roller 13. The paper winding shaft 7 is fixed to the second slip clutch plate 26, and the second slip clutch plate 26 is frictionally coupled to the first slip clutch plate 25 so that it slips when a torque load of a certain level or more is applied. It is configured. The first slip clutch plate 25 and the second slip clutch plate 26 constitute slip clutch means. The first slip clutch plate 25 is connected to the transmission means 22.

  On the other hand, the feed roller 12 is also connected by a feed roller shaft 23 to transmission means 22 combined with gears, pulleys, belts, and the like, and the transmission means 22 is connected to an output shaft 21a of a sheet conveying motor 21 which is a driving means. Has been. When the printing paper 8 is sent out, the paper transport motor 21 rotates in the direction of the arrow b, and the clutch shaft 24 and the first slip clutch plate 25 are rotated in the direction of the arrow d via the transmission means 22 so that the first slip clutch. The sheet winding shaft 7 is rotated at 46 rpm in the direction of arrow e through the second slip clutch plate 26 that can transmit power from the plate 25 by friction, and the feed roller 12 having a diameter of 10 mm is rotated at 670 rpm in the direction of arrow c. When the printing paper 8 wound in a roll shape has a maximum diameter of 145 mm, the paper winding shaft 7 has a peripheral speed of the outer periphery, that is, a conveyance speed of the printing paper 8 of 280 mm / sec. Try to rotate with. Therefore, the peripheral speed of the outer periphery of the feed roller 12 is 351 mm / sec. And the printing paper 8 is 351 mm / sec. Is fed in the direction of the arrow f, so that the difference of 71 mm / sec. Therefore, the slip sheet is slipped between the first slip clutch plate 25 and the second slip clutch plate 26 of the slip clutch means, and the printing paper 8 between the feed roller 12 and the paper winding shaft 7 is tensioned.

  In a color thermal printer, when printing is performed, first, the printing paper 8 is sent out for one screen as described above, and then the printing paper 8 is transported at the same conveying speed as the ink ribbon 18 as described later. Printing is performed on the printing paper 8 by the print head 6 while being conveyed by one screen in the winding direction on the paper winding shaft 7. Therefore, when the printing paper 8 is loaded, the printing paper 8 between the printing paper 8 wound in a roll and the feed roller 12 is in a tensioned state as shown in FIG. When the feed roller 12 starts to rotate, an inertial load of the printing paper 8 wound in a roll shape is applied to the feeding roller 12, a grip portion between the feeding roller 12 and the printing paper 8, a paper conveyance motor 21, In addition, a large load is applied to the transmission means 22. However, when the printing paper 8 is actually loaded, the printing paper 8 between the printing paper 8 wound in a roll shape and the feed roller 12 does not become a tensioned state but has a slight slack. A large load is not given to the grip part of the roller 12 and the printing paper 8, the paper transport motor 21, and the transmission means 22. When printing one screen after loading the printing paper 8 and printing the next screen, the printing paper 8 wound in a roll shape and the feed roller 12 are printed as described later. Since the print paper 8 is slack, the slack print paper 8 is sent at the start of the conveying operation of the feed roller 12, and the inertia load of the print paper 8 wound in a roll shape is applied to the feed roller 12. No great load is applied to the grip portion of the feed roller 12 and the printing paper 8, the paper transport motor 21, and the transmission means 22.

A state in which the printing paper 8 is wound around the paper winding shaft 7 when the printing paper 8 wound in a roll shape has the maximum diameter will be described with reference to FIG. As described above, since the printing paper 8 is wound around the paper winding shaft 7 when printing is performed, the transport speed at the time of winding is smaller than the transport speed at the time of the feeding operation described above. When the printing paper 8 is taken up, the paper transport motor 21 rotates in the direction of the arrow g and winds the paper via the transmission means 22 and the first slip clutch plate 25 and the second slip clutch plate 26 of the slip clutch means. The shaft 7 is rotated at 7.4 rpm in the arrow k direction, and the feed roller 12 having a diameter of 10 mm is rotated at 107.2 rpm in the arrow h direction. When the diameter is 145 mm, the paper winding shaft 7 has an outer peripheral speed, that is, a conveyance speed of the printing paper 8 of 44.8 mm / sec. Rotate with. On the other hand, the peripheral speed of the outer periphery of the feed roller 12 is 56 mm / sec. And the printing paper 8 is 56 mm / sec. Is fed in the direction of the arrow m, so that the difference of 11.2 mm / sec. Therefore, the printing paper 8 between the feed roller 12 and the paper winding shaft 7 is slackened. As described above, since the printing paper 8 can be slackened by the winding operation of the printing paper 8, when the printing paper 8 is sent out as the next operation, the printing paper 8 wound in a roll shape around the feed roller 12 is used. No inertial load is applied, and a large load is not applied to the grip portion between the feed roller 12 and the print paper 8, the paper transport motor 21, and the transmission means 22.

A state in which the printing paper 8 is sent out when the printing paper 8 wound in a roll shape has the minimum diameter will be described with reference to FIG. When the printing paper 8 is sent out, the paper transport motor 21 rotates in the direction of the arrow n, and the clutch shaft 24 and the first slip clutch plate 25 are rotated in the direction of the arrow q via the transmission means 22 so that the first slip clutch. The sheet winding shaft 7 is rotated at 46 rpm in the direction of the arrow r through the second slip clutch plate 26 that can transmit power from the plate 25 by friction, and the feed roller 12 having a diameter of 10 mm is rotated in the direction of the arrow p at 670 rpm. When the printing paper 8 wound in a roll shape has a minimum diameter of 56 mm, the paper winding shaft 7 has an outer peripheral speed, that is, a conveyance speed of the printing paper 8 of 109 mm / sec. Try to rotate with. Therefore, the peripheral speed of the outer periphery of the feed roller 12 is 351 mm / sec. And the printing paper 8 is 351 mm / sec. Is fed in the direction of arrow f, so that the difference is 242 mm / sec. Therefore, the slip sheet is slipped between the first slip clutch plate 25 and the second slip clutch plate 26 of the slip clutch means, and the printing paper 8 between the feed roller 12 and the paper winding shaft 7 is tensioned.

A state in which the printing paper 8 is wound around the paper winding shaft 7 when the printing paper 8 wound in a roll shape has a minimum diameter will be described with reference to FIG. When winding the printing paper 8, the paper transport motor 21 rotates in the direction of the arrow t and winds the paper via the transmission means 22 and the first slip clutch plate 25 and the second slip clutch plate 26 of the slip clutch means. The shaft 7 is rotated in the direction of arrow w at 7.4 rpm, and the feed roller 12 having a diameter of 10 mm is rotated in the direction of arrow h at 107.2 rpm. When the diameter is 56 mm, which is a small diameter, the paper winding shaft 7 has an outer peripheral speed, that is, a conveyance speed of the printing paper 8 of 17.4 mm / sec. Rotate with. On the other hand, the peripheral speed of the outer periphery of the feed roller 12 is 56 mm / sec. And the printing paper 8 is 56 mm / sec. Is sent in the direction of the arrow x at 38.6 mm / sec. Therefore, the printing paper 8 between the feed roller 12 and the paper winding shaft 7 is slackened. As described above, the printing paper 8 wound in the roll shape can be slackened by the winding operation of the printing paper 8 in the same manner as when the printing paper 8 wound in the roll shape has the maximum diameter. At the time of feeding , the inertia load of the printing paper 8 wound in a roll shape on the feed roller 12 is not applied, the grip portion between the feeding roller 12 and the printing paper 8, the paper transport motor 21, and the transmission means 22 Will not be loaded.

  Next, the printing operation on the printing paper 8 while conveying the printing paper 8 as described above will be described. First, while printing paper 8 is conveyed in the direction of arrow m in FIG. 6 and in the direction of arrow x in FIG. 8, yellow of ink ribbon 19 is printed in the printing area for one screen, and then printing paper 8 is returned by one screen. Next, magenta is printed on the printing area for one screen while the printing paper 8 is conveyed in the same manner as the previous time, and cyan is printed on the printing area for one screen while the printing paper 8 is conveyed similarly to the previous time. Print to. In this way, color printing is performed while the yellow, magenta, and cyan coated areas of the ink ribbon 19 are sequentially matched to the printing area for one screen of the printing paper 8.

  As described above, according to the present invention, without providing a buffer roller, a buffer spring, and a member associated therewith, an inertia load of printing paper wound in a roll shape is not applied to the feed roller, and the feed roller And the printing paper gripper, paper transport motor, and transmission means are not subjected to impact loads that occur when transporting the printing paper, making the structure simple, inexpensive and reliable and durable. It is possible to obtain a roll-shaped printing paper transport device that can be easily attached and detached.

1 is a perspective view showing an appearance of a roll paper printing apparatus in an embodiment according to the present invention. It is a perspective view which shows the state which opened the paper holder unit 2 of the roll paper printing apparatus shown in FIG. FIG. 2 is a main cross-sectional view illustrating a state of a main cross section of the roll paper printing apparatus illustrated in FIG. 1. It is operation | movement explanatory drawing which shows the state in which the print head 6 in the roll paper printing apparatus shown in FIG. 3 can print. FIG. 5 is an operation explanatory diagram illustrating a state in which the printing paper is sent out when the printing paper wound in a roll shape has a maximum diameter, illustrating the operation principle of the present invention. FIG. 10 is an operation explanatory diagram illustrating a state in which the printing paper is wound when the printing paper wound in a roll shape has a maximum diameter. FIG. 10 is an operation explanatory diagram illustrating a state in which the printing paper is sent out when the printing paper wound in a roll shape has a minimum diameter. FIG. 6 is an operation explanatory diagram illustrating a state in which the printing paper is wound when the printing paper wound in a roll shape has a minimum diameter. It is a front view which shows the principal part of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Paper holder unit 2a Paper discharge port 2b Paper holder unit axis 3 Paper holder unit frame 4 Paper receiving pocket 5 Print head holder unit 5a Print head holder unit axis 6 Print head 7 Paper holder 8 Printing paper 8a Paper edge 9 lower grip roller 10 upper grip roller 11 platen 12 feed roller 13 pinch roller 14 paper guide plate 15 first roller holder 16 curl correction roller 17 second roller holder 18 ink ribbon winding shaft 19 ink ribbon 20 ink ribbon winding shaft 21 Paper transport motor 22 Transmission means 23 Feed roller shaft 24 Clutch shaft 25 First slip clutch plate 26 Second slip clutch plate

Claims (1)

A paper winding shaft for rotatably holding a printing paper wound in a roll shape as a printing medium, a feed roller for transporting the printing paper in both forward and reverse directions in the longitudinal direction, the paper winding shaft, In a roll-like printing paper transport device having a driving means for driving a feed roller, and a transmission means for transmitting forward and reverse bidirectional power of the driving means to the paper winding shaft and the feed roller, the paper by the paper winding shaft A roll-shaped printing paper conveying apparatus characterized in that a conveying speed is set lower than a paper conveying speed by a feed roller and a slip clutch means is provided between the transmission means and a paper winding shaft.

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