JP2007175910A - Sheet roll printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a sheet roll printer which can form a state in which a recording paper is automatically taken out passing a printing position in a state with no slacking and floating when an opening and closing lid is closed. <P>SOLUTION: When the opening and closing lid 3 of the sheet roll printer 1 is closed, a state in which the recording paper 12a is held between a front side paper feeding roller 37 and a front side paper retaining roller 38, and between a rear side paper feeding roller 34 and a rear side paper retaining roller 35 at positions in a paper conveyance direction before and after a printing position (33a) is formed. A following-side gear 73 at the side of the opening and closing lid 3 slightly rotates when meshed with a driving-side gear 72 of a printer body 2 side. This rotation rotates the front side paper feeding roller 37 in the paper conveyance direction via transmission gears 74-77. The recording paper 12a is consequently sent out, so that slacking and floating of a part of the recording paper passing the printing position are automatically removed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a roll paper printer configured so that a paper feed path is opened when an opening / closing lid is opened so that a roll paper can be easily loaded. In particular, when the opening / closing lid is closed, there is no lifting. The present invention relates to a roll paper printer capable of forming a state in which a recording paper is pulled out through a printing position.

In roll paper printers that issue receipts, the paper feed path from the roll paper storage section to the recording paper discharge port when the open / close lid is opened so that the roll paper can be easily loaded. The structure of which can be opened is known. In a roll paper printer having this structure, for example, a platen member facing the print head, a paper pressing roller in contact with the paper feed roller, and a movable blade of a vertical recording paper cutting device are mounted on the opening / closing lid side. Has been. When the opening / closing lid is opened, these members are separated and the recording paper conveyance path is opened. Therefore, when the recording paper is pulled out from the roll paper stored in the recording paper storage section and the opening / closing lid is closed, the recording paper is moved to the paper feed roller. And a state of being drawn out from the recording paper discharge port through a printing position defined by the platen member is automatically formed. Patent Document 1 discloses such a roll paper printer.
JP 2002-308482 A

  Here, when the open / close lid is closed, the portion of the recording paper passing through the printing position may be loosened and may be lifted from the platen member. If printing is started in this state, for example, the print head mounted on the carriage may hit the part of the recording paper that is floating, and paper jam may occur. Further, since the distance (platen gap) between the recording paper and the print head changes, the print quality also deteriorates. For this reason, conventionally, it has been necessary to remove the slack or lift of the recording paper by performing a paper feeding operation for feeding the recording paper by a predetermined amount after closing the open / close lid.

  In view of this point, an object of the present invention is to form a roll paper that can automatically form a state in which the recording paper is pulled out through the printing position without being loosened or lifted up when the lid is closed. To propose a printer.

  In order to solve the above-described problems, the roll paper printer of the present invention is equipped with a drive side gear to which the rotational force of the paper feed motor is transmitted and a front side paper pressing roller on the printer body side. On the side of the lid, a driven gear, a front paper feed roller, and a rotational force transmission mechanism that transmits the rotation of the driven gear to the front paper feed roller are mounted. The driven gear meshes with the drive gear, and the front paper feed roller comes into pressure contact with the front paper press roller at the front position in the paper feed direction with respect to the print position, and meshes with the drive gear. The rotation of the driven gear generated at this time is transmitted as the rotation of the front paper feed roller in the paper feed direction via the rotational force transmission mechanism.

When the open / close lid is closed, the driven side gear mounted thereon rotates slightly when meshed with the drive side gear. The rotation of the driven gear is transmitted to the front paper feed roller via the rotational force transmission mechanism, and the front paper feed roller rotates in the paper feed direction. The recording paper is sandwiched between the front paper feed roller and the front paper pressing roller. Therefore, when the front paper feed roller rotates in the paper feed direction, the recording paper is fed by a predetermined amount, and the slack or lift of the portion of the recording paper passed through the print position on the rear side is removed.

  Here, in the roll paper printer of the present invention, in addition to the above configuration, a rear paper feed roller is mounted on the printer main body side, and a rear paper press roller is mounted on the open / close lid side. When the open / close lid is closed, the rear paper pressing roller comes into pressure contact with the rear paper feeding roller at a position behind the printing position in the paper feeding direction, and the rear paper The drive-side gear is coaxially attached to the roller shaft of the feed roller.

  When the open / close lid is closed, the print position is sandwiched between the front paper feed roller and the front paper press roller and between the rear paper feed roller and the rear paper press roller at the front and rear positions in the paper feed direction. A state in which the recording paper is sandwiched is formed. When the driven gear is meshed with the driven gear, the driven gear connected to the paper feed motor does not rotate, so the rear paper feed roller that is coaxially connected to the driven gear does not rotate. . On the other hand, as described above, when the open / close lid is closed, the front paper feed roller rotates in the paper feed direction. Accordingly, the recording paper is not fed out at the portion on the rear side of the printing position, and is sandwiched between the rear paper feeding roller and the rear paper pressing roller, and only the portion of the recording paper on the front side is fed out. Therefore, the slack or lift of the recording paper at the printing position can be efficiently and reliably removed by the rotation of the front paper feed roller that occurs when the opening / closing lid is closed.

  In this case, the rotational force transmission mechanism includes a first-stage transmission gear meshed with the drive-side gear, a final-stage transmission gear attached coaxially to the roller shaft of the front paper feed roller, And a gear-type rotational force transmission mechanism including at least one intermediate transmission gear meshing with each other.

  In the roll paper printer of the present invention, the front paper feed roller disposed on the front side of the paper feed direction at the print position is moved in the paper feed direction by utilizing the rotation of the driven gear that meshes with the drive gear when the lid is closed. To rotate. Therefore, when the open / close lid is closed, the recording paper passed through the printing position is sent out by a predetermined amount, and the slack or lift is automatically removed. Therefore, it is not necessary to perform a paper feeding operation in order to remove the slack and lifting of the recording paper after the opening / closing lid is closed.

  Embodiments of a printer to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view of an ink jet type roll paper printer to which the present invention is applied, and FIG. 2 is an external perspective view of a state in which the opening / closing lid is fully opened. The roll paper printer 1 of this example has a printer body 2 having a substantially rectangular parallelepiped shape as a whole, and an opening / closing lid 3 attached to the front surface of the printer body 2. A recording paper discharge port 4 having a predetermined width is formed on the front surface of the outer case 2 a of the printer main body 2. A paper discharge guide 5 protrudes forward below the recording paper discharge port 4, and a lid opening / closing lever 6 is disposed on the side of the paper discharge guide 5. A rectangular opening 2b for inserting and removing roll paper is formed below the paper discharge guide 5 and the lid opening / closing lever 6 in the outer case 2a. The opening 2b is sealed by the opening / closing lid 3.

When the lid opening / closing lever 6 is operated, the opening / closing lid 3 is unlocked. When the paper discharge guide 5 is pulled forward, as shown in FIG. 2, the opening / closing lid 3 opens until it is substantially horizontal forward with the lower end as a center. When the opening / closing lid 3 is opened, the roll paper storage unit 11 formed inside the printer is opened, and at the same time, the recording paper transport path from the roll paper storage unit 11 to the recording paper discharge port 4 is opened, and the printer is opened. The roll paper can be easily replaced from the front.

  An opening 2c is also formed on the right side of the opening / closing lid 3, and an opening / closing lid 7 that can be opened / closed around the lower end is attached thereto. When the opening / closing lid 7 is opened, the ink cartridge loading unit 18 as an ink supply unit is opened, and the ink cartridge can be replaced. An operation surface 2d is adjacent to the left side of the opening / closing lid 3, and a status display lamp composed of LEDs, a paper feed button, and the like are arranged therein.

  FIG. 3 is a perspective view showing a printer mechanism portion built in the outer case 2a of the roll paper printer 1, and FIG. 4 is a schematic longitudinal sectional view when the printer mechanism portion is cut in the front-rear direction. The printer mechanism unit 10 includes a roll paper storage unit 11 at the center in the width direction, and the roll paper storage unit 11 stores the roll paper 12 in a horizontally placed state facing the printer width direction. It has become. A head unit 13 is mounted horizontally on the upper side of the roll paper storage unit 11. The head unit 13 includes a head unit frame 14, and a carriage guide shaft 15 extends horizontally between the left and right side plate portions 14 a and 14 b of the head unit frame 14. A carriage 17 on which the head 16 is mounted in a downward state can reciprocate.

  As shown in FIG. 3, an ink cartridge loading unit 18 and a head maintenance unit 20 are disposed in the lower part of the left side portion of the head unit 13 adjacent to the right side of the roll paper storage unit 11. An ink cartridge (not shown) can be attached to the ink cartridge loading unit 18 disposed on the lower side. The head maintenance unit 20 disposed on the upper side collects the wiper for wiping the nozzle surface of the inkjet head 16 and the waste ink discharged or discharged from each nozzle on the nozzle surface, similarly to the known head maintenance unit. A recovery unit (not shown) is provided. A lower portion of the right side portion of the head unit 13 adjacent to the left side of the roll paper storage portion 11 is a substrate mounting portion 22 on which a control substrate (not shown) is mounted.

  As shown in FIG. 4, in the printer mechanism unit 10, a recording paper guide 32 is disposed horizontally along the printer width direction at a rear portion between the roll paper storage unit 11 and the head unit 13. Yes. On the front side of the recording paper guide 32, a platen guide 33 is disposed horizontally in the front-rear direction of the printer at a position one step higher. An ink jet head 16 mounted on the carriage 17 is disposed directly above the platen guide 33. The nozzle surface 16a of the inkjet head 16 is opposed to the upper surface 33a of the platen guide 33 with a certain gap, and the printing position is defined by the upper surface 33a.

  A rear paper feed roller 34 is stretched horizontally in the printer width direction between the platen guide 33 that defines the print position and the recording paper guide 32. A rear paper pressing roller 35 having a predetermined width is pressed against the rear paper feeding roller 34 from below with a predetermined pressing force. A front-side paper feed roller 37 is disposed at a front end side portion of the platen guide 33. A front paper pressing roller 38 is pressed against the front paper feeding roller 37 from above. The rear paper feed roller 34 and the front paper feed roller 37 are driven by a paper feed motor 36 mounted on the head unit 13.

  The carriage 17 is reciprocated in the printer width direction (printing width direction) by a carriage transport mechanism including a carriage motor 39 and a timing belt 40. When the carriage 17 reciprocates, printing is performed on the surface of the recording paper 12a that is fed from the roll paper 12 and passes the printing position by the ink jet head 16 mounted thereon.

  An ink damper 41 is mounted on the carriage 17, and a flexible ink tube 42 is connected thereto. Each color ink is supplied to the inkjet head 16 from the ink cartridge mounted on the ink cartridge loading unit 18 via the ink tube 42, and full-color printing can be performed by the inkjet head 16.

  A scissors-type recording paper cutting device 44 is disposed at the recording paper discharge port 4 from which the recording paper 12a after printing is discharged. The fixed blade 45 of the recording paper cutting device 44 is arranged vertically in the upward state, and the movable blade 46 is arranged vertically downward. When the movable blade 46 pivots in the vertical direction with one end in the printer width direction as a fulcrum by the movable blade drive mechanism 47, the contact point with the fixed blade 45 moves in the printer width direction, and the recording paper positioned between them. 12a can be cut in the width direction.

  Here, the open / close lid 3 includes a platen guide 33, a recording paper guide 32, a rear paper pressing roller 35, a front paper feeding roller 37, and a fixed blade 45 mounted on the lid frame 51. A lid opening / closing lever 6 and a recording paper discharge guide 5 are attached to the front end of the lid frame 51. The open / close lid 3 is configured to open and close while maintaining a horizontal state by, for example, a parallel link mechanism.

  When the opening / closing lid 3 is opened, the roll paper loading / unloading opening 2b of the roll paper storage unit 11 is opened, and the recording paper transport path from the roll paper storage unit 11 to the recording paper discharge port 4 is opened. Become. Therefore, when the roll paper 12 is stored in the roll paper storage unit 11, the recording paper 12a is pulled out from the roll paper 12 by a predetermined length, and then the opening / closing lid 3 is closed, as shown by a thick dashed line in FIG. The recording paper 12 a drawn from the roll paper 12 stored in the roll paper storage unit 11 is guided by the recording paper guide 32, and the platen guide 33 is interposed between the first paper feed roller 34 and the first paper pressing roller 35. A recording paper set state in which the recording paper is drawn out from the recording paper discharge port 4 through the space between the second paper feeding roller 37 and the second paper pressing roller 38 via the upper surface 33a (printing position) is formed.

  When the rear paper feed roller 34 and the front paper feed roller 37 rotate in this state, the conveyance of the recording paper 12a is started. The inkjet head 16 is driven in synchronization with the conveyance of the recording paper 12a, and printing is performed on the surface of the recording paper 12a passing through the printing position. After the completion of the predetermined printing, for example, the conveyance is stopped in a state where the recording paper 12a after printing is discharged from the recording paper discharge port 4, and the recording paper 12a is cut by the recording paper cutting device 44 to have a predetermined length. A printed sheet of printed paper is issued.

(Paper feed power transmission system)
Next, FIG. 5 is a perspective view showing the printer mechanism unit 10 with the head unit portion other than the power transmission system of the paper feed motor, the left and right ink cartridge mounting portions, the head maintenance unit, and the substrate mounting portion removed. It is. FIG. 6 is an explanatory diagram showing the transmission path of the paper feed power. FIG. 7 is an explanatory view showing a lock mechanism for locking the opening / closing lid 3 in the closed position.

  With reference to FIGS. 5 and 6, a paper feed power transmission system for transmitting the rotation of the paper feed motor 36 to the rear paper feed roller 34 and the front paper feed roller 37 will be described. The rotation of the paper feed motor 36 is transmitted to the end of the roller shaft 34a of the rear paper feed roller 34 via a belt / pulley type transmission mechanism 71 as shown in FIG. A drive side gear 72 is coaxially attached to the opposite shaft portion of the roller shaft 34a.

  On the side of the opening / closing lid 3, a driven gear 73 is attached to the side of the lid frame 51 in a rotatable state. When the open / close lid 3 is closed, the driven gear 73 meshes with the driving gear 72 while rotating slightly. Further, on the side of the lid frame 51, a gear-type rotation composed of first to fourth transmission gears 74, 75, 76 and 77 arranged from the front side of the driven gear 73 toward the front of the printer. A force transmission mechanism is arranged. The fourth-stage transmission gear 77, which is the final stage, is fixed coaxially to the shaft end of the roller shaft 37a of the front paper feed roller 37 attached to the open / close lid 3.

  As shown in FIG. 6, when the open / close lid 3 is closed, the print position (33a) is sandwiched between the front paper feed roller 37 and the front paper presser roller 38 and the rear paper at positions before and after in the paper feed direction. A state in which the recording paper 12 a is sandwiched between the feeding roller 34 and the rear paper pressing roller 35 is formed. At the same time, the driven gear 73 meshes with the drive gear 72 to form a transmission path for transmitting the rotational force of the paper feed motor 36 to the front paper feed roller 37.

  Here, when the driven gear 73 meshes with the drive side gear 72, the rear paper feed roller 34 connected to the paper feed motor 36 does not rotate, so that it is coaxial with the rear paper feed roller 34. The connected driving gear 72 does not rotate either. On the other hand, the driven gear 73 rotates slightly when meshed with the drive gear 72. In this example, since the opening / closing lid 3 moves from the front side of the printer to the rear side and reaches the closed position, the driven gear 73 slightly rotates in the paper feed direction when meshed with the upper drive side gear 72. Since this rotation is transmitted through the transmission gears 74 to 77, the transmission gear 77 at the final stage also rotates in the paper feed direction as indicated by an arrow in FIG. Therefore, the front paper feed roller 37 to which the transmission gear 77 is attached rotates in the paper feed direction.

  Accordingly, the recording paper 12a is not fed out at the portion on the rear side of the printing position (33a) and is sandwiched between the rear paper feeding roller 34 and the rear paper pressing roller 35, and only the portion of the recording paper 12a on the front side from this is held. Is sent out. As a result, when the opening / closing lid 3 is closed, as shown by a thick line in FIG. 6, even if the recording paper 12a is loosened or lifted at the printing position (33a), the recording paper is rotated by the rotation of the front paper feed roller 37. 12a is sent out, and such slack and lift are reliably removed.

(Opening / closing lid locking mechanism)
Next, a lock mechanism that locks the open / close lid 3 in the closed position will be described. As shown in FIGS. 5 and 7, the lock mechanism is fixed to the front shaft 52 of the lid frame 51 so as to be rotatable in the opening / closing lid opening / closing direction and to both ends of the spindle 52. A pair of left and right lock levers 53 (only one side is shown in the figure) which is a lid side engaging portion, and a pair of left and right main body side engaging portions provided on the printer main body 2 side. An engagement shaft 54 (only one side is shown in the figure) is provided. The lid opening / closing lever 6 is fixed to the end of the support shaft 52. When the cover opening / closing lever 6 is pressed, the support shaft 52 rotates and the front end side of the lock lever 53 fixed to both ends thereof (the rear side of the printer). Can be swung upward. The lock lever 53 is always urged in the lock direction by a torsion spring or the like.

  The lock lever 53 is a vertical plate having a substantially constant width that protrudes from both ends of the support shaft 52 toward the rear of the printer, and the lower end surface of the front end thereof is inclined downward from the rear side of the printer toward the front side. An inclined end surface 53a is formed. A hook portion 53b that can be engaged with the engagement shaft 54 from the rear side of the printer (front side in the closing direction of the opening / closing lid) is formed at the lower end portion of the inclined end surface 53a. That is, the engagement end surface 53c bent upward is continuous with the lower end of the inclined end surface 53a, and the lower end surface 53d bent and extended toward the front side of the printer is continuous with the upper end of the engagement end surface 53c.

  The left and right engagement shafts 54 on the printer main body side are shafts that project at right angles from the outer side surfaces of the side plate portions 55 and 56 on both sides of the roll paper storage unit 11 outward in the printer width direction. When the opening / closing lid 3 is closed, along with the closing operation, the inclined end surface 53a of the lock lever 53 hits the engagement shaft 54. Thereafter, the lock lever 53 is pushed upward, and the hook portion 53b moves the engagement shaft 54. The locked end state is formed in which the engagement end surface 53b is engaged with the engagement shaft 54 from the rear side of the printer.

  When the lid opening / closing lever 6 is pushed in the locked state, the tip portions of the left and right lock levers 53 pivot upward, and the hook portions 53b are disengaged upward from the engagement shaft 54, and the locked state is released.

  Here, in order to securely lock the lock lever 53 with respect to the engagement shaft 54, the opening / closing lid 3 can be pushed to the rear of the printer a little more than the closed position. Therefore, in the locked state, the opening / closing lid 3 is in a backlashed state in the front-rear direction. The urging mechanism described below is attached to the lock mechanism of this example, and the rattling is prevented by the urging mechanism, so that the opening / closing lid 3 can be locked while being positioned at the closed position.

  The urging mechanism of this example includes a fixed blade 45 mounted on the open / close lid 3 and a tension coil spring 61 that pulls the fixed blade 45 toward the rear side of the printer (in the closing direction of the open / close lid). The fixed blade 45 is attached by a front end portion 51a of the lid frame 51 so as to be slightly movable in the front-rear direction of the printer (opening / closing lid opening / closing direction). The tension coil spring 61 is hooked at the left and right end portions of the fixed blade 45, and the rear ends of the tension coil spring 61 are hooked by a spring hook 51 b formed on the rear side of the fixed blade 45 in the lid frame 51. ing. The fixed blade 45 is constantly urged toward the rear side of the printer (in the closing direction of the opening / closing lid) by these tension coil springs 61.

  The left and right end portions of the fixed blade 45 are formed with a pair of left and right contact plate portions 45a (lid side contact portions) protruding upward. These abutting plate portions 45a can abut on the front surface portions 14d (main body side abutting portions) of the lower edge portions of the front plate portion 14c of the unit frame 14 in the head unit 13 from the front of the printer. In this example, when the opening / closing lid 3 is closed, immediately before the hook portion 53b of the lock lever 53 of the lock mechanism is hooked on the engagement shaft 54, the contact plate portion 45a is the front portion 14d of the front plate portion 14c. It is set so that it may contact.

  When closing the open / close lid 3, the right and left abutment of the fixed blade 45 immediately before the hook portions 53b of the left and right lock levers 53 of the lock mechanism are engaged with the left and right engagement shafts 54 on the printer body 2 side. The plate portion 45a hits the front surface portion 14d of the front plate portion 14c on the printer main body side. When the open / close lid 3 is pushed in and a locked state is formed by the lock mechanism, the fixed blade 45 is pushed forward from the printer body 2 side by a predetermined pressing force. The fixed blade 45 is supported on the lid frame 51 of the open / close lid 3 by a pair of left and right tension coil springs 61. Therefore, the opening / closing lid 3 is pulled in front of the printer as a whole by the pressing force applied to the fixed blade 45 from the printer body 2 side. As a result, the engagement end surfaces 53c of the hook portions 53b of the left and right lock levers 53 in the lock mechanism are pressed against the left and right engagement shafts 54 from the rear side. That is, the open / close lid 3 is locked in a state where the open / close lid 3 is positioned without looseness at the closed position.

Accordingly, in the closed state of the opening / closing lid 3, the first paper pressing roller 35 and the second paper feeding roller 37 mounted on the opening / closing lid 3 are the first paper feeding roller 34 and the second paper pressing roller 37 on the printer body 2 side. 38 in a state of being reliably positioned with respect to 38. Therefore, since these recording paper nip forces can be kept constant, adverse effects such as fluctuations in the nip force due to variations in the roller contact position, variations in the paper feed pitch, and deterioration in print quality can be prevented.

  Next, the operation of the urging mechanism when the opening / closing lid 3 locked in the closed position is opened will be described. When the lid opening / closing lever 6 is pushed downward, the left and right lock levers 53 of the lock mechanism pivot, and the hook portions 53b move upward to disengage from the left and right engagement shafts 54 on the printer body 2 side. The lock is released.

  A predetermined pressing force is applied to the opening / closing lid 3 from the printer main body 2 side in the opening direction by an urging mechanism. When the lock is released, the opening / closing lid 3 is automatically kicked forward (in the opening direction) by the pressing force. As a result, the hook portion 53b of the lock lever 53 of the lock mechanism moves to a position in front of the printer with respect to the engagement shaft 54. Therefore, even if the operation of the lid opening / closing lever 6 is released, the opening / closing lid 3 is again locked. There is nothing.

  The open / close lid 3 kicked forward is automatically opened to its fully open state by its own weight with its lower end as a center. In order to adjust the opening speed of the opening / closing lid 3, a coil spring that urges the opening / closing lid 3 with a predetermined force in the closing direction may be bridged between the support of the opening / closing lid 3 and the printer body 2. Alternatively, a torsion spring or the like may be disposed on a support shaft that defines the rotation center of the opening / closing lid 3.

  Thus, in this example, the lock of the opening / closing lid 3 is released by a simple operation of pushing the lid opening / closing lever 6 only once, and the opening / closing lid 3 is automatically sent in the opening direction. Therefore, the operability when opening the opening / closing lid 3 is improved.

1 is an external perspective view of a roll paper printer to which the present invention is applied. FIG. 2 is an external perspective view of a roll paper printer with an open / close lid open. It is a perspective view showing a printer mechanism part of a roll paper printer. It is a schematic longitudinal cross-sectional view of a printer mechanism part. It is a perspective view which shows the printer mechanism part in the state which abbreviate | omitted one part. It is explanatory drawing which shows the transmission path | route of the paper feed power arrange | positioned at the opening-and-closing lid. It is explanatory drawing which shows the locking mechanism and urging | biasing mechanism of an opening-and-closing lid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll paper printer, 2 Printer main body, 2a Exterior case, 2b Opening part, 3 Opening / closing lid, 4 Recording paper discharge port, 5 Paper discharge guide, 6 Lid opening / closing lever, 11 Roll paper storage part, 12 Roll paper, 12a Recording paper , 13 Head unit, 14 Head unit frame, 14c Front plate portion, 14d Front portion, 32 Recording paper guide, 33 Platen guide, 34 Rear paper feed roller, 34a Roller shaft, 35 Rear paper press roller, 37 Front paper feed Roller, 37a Roller shaft, 38 Front paper pressing roller, 44 Recording paper cutting device, 45 Fixed blade, 45a Abutting plate portion, 46 Movable blade, 51 Cover frame, 51b Spring hook, 52 Support shaft, 53 Lock lever, 53b Hook Part, 54 engaging shaft, 61 tension coil spring, 71 belt-pulley type power transmission mechanism, 72 Moving side gear 73 driven gear, 74 to 77 transmission gear

Claims (3)

On the printer body side, the drive side gear to which the rotational force of the paper feed motor is transmitted and the front side paper pressing roller are mounted.
On the opening / closing lid side, a driven gear, a front paper feed roller, and a rotational force transmission mechanism that transmits the rotation of the driven gear to the front paper feed roller are mounted,
When the open / close lid is closed, the driven side gear meshes with the driving side gear, and the front paper feed roller is in pressure contact with the front paper presser roller at the front position in the paper feed direction with respect to the print position. Become
A roll paper printer, wherein the rotation of the driven gear generated when meshing with the driving gear is transmitted as rotation of the front paper feed roller in the paper feed direction through the rotational force transmission mechanism. In claim 1,
A rear paper feed roller is mounted on the printer body side,
A rear paper pressing roller is mounted on the opening / closing lid side,
When the open / close lid is closed, the rear paper pressing roller is in pressure contact with the rear paper feeding roller at a position behind the printing position in the paper feeding direction.
A roll paper printer, wherein the drive side gear is coaxially attached to a roller shaft of the rear paper feed roller. In claim 2,
The rotational force transmission mechanism is meshed between a first-stage transmission gear meshed with the drive-side gear, a final-stage transmission gear attached coaxially to the roller shaft of the front paper feed roller, A roll paper printer comprising at least one intermediate transmission gear.

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