JPH062985Y2 - Paper feeder for printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention is equipped with a storage unit that is mounted on a printer and stacks and stores print sheets of cut sheets, and prints the print sheets in the storage unit. The present invention relates to a sheet feeding device that feeds sheets one by one to the printing position.

(Prior Art) In this type of conventional sheet feeding device, a feeding roller is provided so as to come into contact with the uppermost sheet of the printing sheets stacked and accommodated in the accommodating unit, and is accommodated by the rotation of the feeding roller. There is a type in which the printing paper in the set is sent out one by one from the uppermost position.

(Problems to be solved by the invention) However, in this conventional device, a single-sheet spelling sheet, which is formed by stacking a plurality of sheets of paper including carbon paper and adhering to each other along one edge, is removed from the storage unit. When sending out one copy at a time, since one sheet of paper is stuck and fixed along one edge, the loop formed on the uppermost sheet of the paper is gradually expanded as the feed roller rotates. Then, there is a problem that the spelled paper is sent out in this loop expansion state and a paper jam occurs in the paper feed path. Further, in the case of feeding a sheet having a short length in the feeding direction, the sheet cannot be fed until the leading edge of the sheet reaches the feeding means in the printer, and therefore, the length of the sheet that can be fed is reduced. There was a problem of being limited.

Configuration of the Invention (Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems, and a first printing paper in the storage unit is sent from the storage unit one by one. And a second feeding roller that feeds the printing paper sent from the accommodating section to the printing position at a position separated from the accommodating section in the paper feeding direction by a supporting frame. A frame is provided so as to be rotatable around a shaft supported between a pair of frame parts and movable in a paper width direction, and a driven roller that is pressed against the second feeding roller extends horizontally between the frame parts. The second feeding roller is always in contact with the driven roller at an arbitrary position in the paper width direction.

(Effect) Therefore, according to the paper feeding device of the present invention, in the case of feeding the single-sheet spelling paper in which a plurality of papers including carbon paper are laminated and pasted together along one edge, The loop formed on the uppermost sheet of the binding sheet in accordance with the rotation of the feeding roller is formed between the second feeding roller and the driven roller on the sheet feeding side by the rotation of the second feeding roller. It is possible to reliably prevent the possibility that the paper is jammed in the paper feeding path due to the positive pulling action of the paper.

Further, even if the paper has a short length in the feeding direction, the leading end of the paper reaches the feeding means in the printer by being fed by the first feeding roller and further fed by the second feeding roller. be able to. Therefore, various sheets can be fed without being limited in length.

Further, by moving the support frame in the paper width direction according to the width of the paper stored in the storage unit, the first and second feeding rollers are simultaneously moved in the paper width direction, and the second feeding roller is moved. Since the roller comes into contact with the rod-shaped driven roller at an arbitrary position, it is possible to easily cope with sheets of various widths.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

First, as to the configuration of the printer, as shown in FIG. 1, a printer case 1 is composed of an upper case 2 and a lower case 3 assembled together at the center, and a printing mechanism unit 4 is provided on one side inside thereof. A tractor unit 5 forming tractor means is housed on the other side. The unit frame 6 of the printing mechanism unit 4 is frame-structured by erection of one hollow erection bar 8 and two round bar-shaped guide bars 9 and 10 between a pair of left and right side plates 7. A platen 11 having a cylindrical shape is rotatably supported between the side plates 7 above the plates 10, 10.

The carriage 12 is supported by the guide bars 9 and 10 so as to be movable in the left-right direction, and a print head 13 is mounted on the upper portion of the carriage 12 so as to face the platen 11 from diagonally below. The ribbon cassette 14 is arranged between the both side plates 7 of the printing unit frame 6, and a part of the ink ribbon 15 pulled out from the inside is transferred along a position facing the print head 13 on the platen 11, that is, a printing position. . Then, while the carriage 12 is moved in the left-right direction, the print head 13 prints on the print paper at the print position on the platen 11 via the ink ribbon 15.

The pair of feed rollers 16, 17, 18 and 19 are respectively arranged substantially tangential to the print position on the platen 11 before and after the print position in the paper feed direction, and are driven by a drive source such as a motor (not shown) via a gear mechanism. Platen 11
At the same time, the print paper is rotated in the paper feed direction so that the print paper is carried while being held. The passage forming member 20 and the guide member 28 are arranged so as to substantially sandwich the tangent line of the platen 11, and the passage forming member 20 and the guide member 28 are disposed.
A sheet guide passage 21 passing through the print position is formed by the feed rollers 16 to 19. Further, the paper guide passage 21 is substantially flat and is in an inclined state in which the introduction side to the printing position is located below the discharge side.

The tractor unit 5 includes a guide shaft 22 and a transmission shaft 23 extending in parallel in the left-right direction, and a pair of left and right pin tractors 24 supported by the shafts 22 and 23 so as to be movable in the width direction of the sheet. The upper surface of the pin tractor 24 is arranged on the upstream side of the paper guide passage 21 in the paper feeding direction in an inclined state in substantially the same plane as the same. The pin tractor 24 has a structure in which a belt with pins is wound around a pair of pulleys supported by both shafts 22 and 23, as in the case of an ordinary device of the same type. Then, the feed holes provided on both sides of the continuous printing paper are fitted into the pins of both the pin tractors 24, and in this state, the transmission shaft 23 is connected to the drive source of the feed rollers 16 to 19 to form the pin tractor 24. By being rotated, the continuous print paper is introduced and guided into the paper guide passage 21.

A manual feed guide plate 25, which constitutes a guide means, is supported above the tractor unit 5 and between both side plates 7 of the printing unit frame 6, extends substantially horizontally on the upper surface thereof, and forms a predetermined angle with respect to the paper guide passage 21. Intersecting guide surfaces 26 are formed. Then, along the guide surface 26 of the guide plate 25, the cut-sheet printing paper is manually guided into the paper guide passage 21. Left and right side guide plates 2
7 is movably mounted on a guide plate 25 in a direction orthogonal to the paper feed direction, and both side edges of the printing paper are guided and regulated by engagement with the side guide plates 27.

Next, a paper supply device that is removably inserted on the printer case 1 in the vicinity of the upper part of the manual feed guide plate 25 will be described.

As shown in FIGS. 1 to 3, a flat box-shaped device frame 31 includes a pair of front and rear erection members 3 erected on a bottom portion between a pair of left and right side frame portions 32 and both side frame portions 32.
A frame structure is constituted by 3, 34. The two stackers 35 and 36 forming the first and second sheet accommodating portions are supported on the installation members 33 and 34 of the apparatus frame 31 in an inclined state, and the stackers 35 and 36 have different sizes and the like. Printing sheets of single-cut sheets are stacked and accommodated.

Front drive shaft 3 rotated by a drive motor (not shown)
7 is horizontally extended and supported between both side frame portions 32 of the apparatus frame 31 corresponding to the first stacker 35 on the front side,
A pair of left and right feed rollers 38 are fitted and supported on the drive shaft 37 so as to be integrally rotatable. Then, the printing sheets stacked and accommodated in the first stacker 35 are urged to be pushed up toward the feeding roller 38 by a means such as a spring, and as the feeding roller 38 rotates, the printing sheets at the uppermost position are sequentially fed out. Then, it is supplied to the paper guide passage 21 of the printer through the opening 39 provided at the bottom of the apparatus frame 31.

Rear drive shaft 4 rotated by a drive motor (not shown)
0 corresponds to the second stacker 36 on the rear side and is horizontally extended and supported between the both side frame portions 32 of the apparatus frame 31,
A pair of left and right feeding parts 41 are inserted and supported on the drive shaft 40. Each feeding unit 41 is composed of a support frame 42 and a pair of feeding rollers 43 and 44 which are supported on the supporting frame 42 so as to be separated from each other in the sheet feeding direction. The printing sheets stacked and accommodated in the second stacker 36 are pressed by means of a spring or the like, and the lower surface of the feeding roller 44 on the downstream side is driven by a rod-shaped driven member extending horizontally between both frame portions 32 of the apparatus frame 31. The roller 45 is pressed against the surface by means of a spring or the like. And drive shaft 4
With the rotation of 0, both feeding rollers 43, 44 are rotated by gears 46, 4
The feed roller 4 on the upstream side is rotated in association with each other via 7, 48.
3, the printing papers of the second stacker 36 are sequentially sent to the uppermost position, and the printing papers sent are made to cooperate with the apparatus frame 31 by the cooperation of the feeding roller 44 and the driven roller 45 on the downstream side. It is supplied to the paper guide passage 21 through an opening 49 provided at the bottom and through a guide surface 26 of a manual guide plate 25 on the printer side.

Next, the feeding section body 41 on the side of the second stacker 36 and its related structure will be described in detail. As shown in FIGS. 1 to 3, the support frame 42 of the feeding section body 41 has a substantially planar shape. It is formed in a U shape, and is supported by the drive shaft 40 at the ends of both side walls thereof so as to be rotatable and movable in the width direction of the paper. The feed roller 43 on the upstream side is rotatably supported between both side walls of the support frame 42, and the rotation of the drive shaft 40 is rotated by the gear 46.
It is adapted to be transmitted to the upstream side feeding roller 43 via ~ 48. On the other hand, the downstream feeding roller 44 is
The drive shaft 40 is supported between the both side walls of the support frame 42 via a clutch, and when the drive shaft 40 is rotating clockwise in FIG. 1, the drive shaft 40 rotates clockwise in FIG. However, when the drive shaft 40 is stopped, the drive shaft 40 idles only clockwise.

The supporting frame 42 is rotated clockwise about the drive shaft 40 by its own weight, and the upstream feeding roller 43 is always in contact with the printing paper on the second stacker 36. . A stopper 51 is provided behind the support frame 42, and the stopper 51 is provided between the both side frame portions 32 of the apparatus frame 31 when the printing paper is loaded on the second stacker 36. Engage with 52,
The support frame 42 is prevented from being largely rotated beyond a predetermined position. Further, as described above, the driven roller 45 is in pressure contact with the lower surface of the outer circumference of the downstream side feeding roller 44 by means of a spring or the like.

With this configuration, when the drive shaft 40 rotates clockwise in FIG. 1, the downstream feed roller 44 rotates clockwise and the upstream feed roller 43 rotates clockwise via the gears 46 to 48. To do. With the rotation of the feeding roller 43, the uppermost sheet of the stacked sheets of the second stacker 36 is fed toward the feeding roller 44 on the downstream side. Since the feed roller 44 on the downstream side is also rotating in the clockwise direction, the sheet delivered from the second stacker 36 in accordance with this rotation passes through the opening 49 and the sheet guide passage 21 of the printer.
The feed rollers 16 and 17 are fed until the tip reaches the abutting portion of the pair of feed rollers 16 and 17. The rotation of the drive shaft 40 stops when the leading edge of the paper reaches the contact portion of the feed rollers 16 and 17, and the rotation of the feed rollers 16 and 17 starts, so that the paper is fed toward the printing position on the platen 11. Be done. At this time, if the vicinity of the rear end of the sheet is in contact with the feed rollers 43 and 44 again, the drive shaft 40 is rotated by the action of the clutch along with the sheet pulled out by the feed rollers 16 and 17 of the printer. Only the feeding roller 44 on the downstream side idles without rotating. As a result, the upstream-side feeding roller 43 does not rotate, so that the second sheet is not fed out following the uppermost sheet.

Further, in the case where a plurality of sheets of paper including carbon paper are stacked in the second stacker 36, and cut sheets of binding paper, which are attached to each other along one edge thereof, are stacked and accommodated and sent out part by part, Even if the second stacker 36 is fed with the loop formed only on the uppermost sheet of the binding sheets due to the rotation of the upstream feeding roller 43, the downstream feeding roller 44 and the driven roller 45 In the meantime, the expansion of the loop is suppressed by the positive pulling action on the sheet feeding side by the rotation of the feeding roller 44. Therefore, the spelled paper is smoothly fed to the printing position on the platen 11 through the paper guide passage 21 of the printer without causing a paper jam in the paper feed path.

Further, even a short length of paper that cannot be fed out only by the upstream side feeding roller 43 until the leading edge of the sheet reaches the contact portion of the feeding rollers 16 and 17 of the printer is fed by the downstream side feeding roller 44. Can be delivered until it reaches the abutting portion.

Furthermore, by moving the support frame 42 in the paper width direction according to the width of the paper stored in the second stacker 36, both the feeding rollers 43, 44 are moved in the paper width direction at the same time, and on the downstream side. Since the feeding roller 44 comes into contact with the rod-shaped driven roller 45 at an arbitrary position, it is possible to easily deal with sheets of various widths.

The invention is not limited to the configuration of the above-described embodiment, and the configurations of the respective parts can be arbitrarily modified and embodied without departing from the spirit of the invention.

Effect of the Invention As described in detail above, according to the present invention, when a plurality of sheets of paper including carbon paper are stacked and pasted together along one edge thereof The loop formed on the uppermost sheet of the binding sheet in accordance with the rotation of the feeding roller is formed between the second feeding roller and the driven roller on the sheet feeding side by the rotation of the second feeding roller. With the positive effect of being pulled out, it is possible to reliably prevent the possibility of paper jamming in the paper feed path.

Further, the sheet having a short length in the feeding direction is also fed by the first feeding roller and then fed by the second feeding roller so that the leading end of the sheet reaches the feeding means in the printer. You can Therefore, there is also an excellent effect that various types of sheets can be fed without being limited in length.

Further, by moving the support frame in the paper width direction according to the width of the paper stored in the storage unit, the first and second feeding rollers are simultaneously moved in the paper width direction, and the second feeding roller is moved. Since the roller comes into contact with the rod-shaped driven roller at an arbitrary position, it has an excellent effect that it can easily cope with sheets of various widths.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a printer embodying the present invention, FIG. 2 is a reduced plan view showing a second stacker portion of a sheet feeding device, and FIG. 3 is a second stacker. It is a partial perspective view which expands and shows the structure of the upper feeding part body. 36 ... Second stackers as accommodating portions, 43, 44 ... Feeding rollers, 45 ... Follower rollers.

Claims (1)

[Scope of utility model registration request] 1. An accommodating portion (36) which is mounted on a printer and accommodates stacked printing paper sheets, and supplies the printing papers in the accommodating portion (36) to a printing position of the printer part by part. In the paper feeding device configured as described above, the first feeding roller (43) for feeding the printing paper in the accommodating portion (36) part by portion from the accommodating portion, and the position separated from the accommodating portion (36) in the paper feeding direction. And a second feeding roller (44) for feeding the printing paper sent from the storage section (36) to the printing position by the support frame (42),
The support frame (42) is provided on a shaft (40) supported between a pair of frame parts (32) so as to be rotatable and movable in the paper width direction, and is pressed against the second feeding roller (44). The driven roller (45) is formed in a rod shape extending horizontally between the frame portions (32), and the second feed roller (44) is provided.
A sheet feeding device for a printer, wherein the sheet feeding device can always contact the driven roller (45) at any position in the sheet width direction.