JPS60202029A - Paper feeding and discharging device for printer - Google Patents

Abstract

PURPOSE:To aim at the promotion of miniaturization and inexpensiveness, by performing the drive between both pickup and paper discharge rollers with rotation of both c.w. and c.c.w. directions in one independent motor via a one-way clutch, not dependent upon a platen driving LF motor of a printer. CONSTITUTION:When a motor 3 is rotated clockwise, a clutch pawl 18 is engaged with a one-way clutch gear 16, and a pickup roller 5 rotates clockwise as well via a pulley 19, a belt 4 and a pulley 15a. Therefore, paper 1 piled up on a paper feeding table 2 is picked up one by one and fed to a platen 6. And, when the pickup of the paper 1 is all over, the motor 3 rotates reversely and thereby a one-way clutch gear 22 is engaged with a clutch pawl 24 so that a clutch plate 23 rotates counterclockwise. Therefore, a paper discharge roller 8 rotates counterclockwise as well via a pulley 25, a belt 26 and a pulley 8a, thus the paper 1 being printed on the platen 6 is discharged onto a paper discharging table 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a paper feeding and discharging device for feeding and discharging paper for a printer.

[Technical background of the invention] 5 Majesty 1 ton IL-i? Ebase 0) - 7'llゝno no no no ni no ni no ni no ni no ni no ni no ni no no ni no ni no no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no ni no no ni no ni no-no-no-no-no-toe-s part hi hi hiku yaku ze 90] si 90 counterpart si si si counterpart to si 90) interpretation ~iυl n is being shown. Paper sheets 1 are stacked on a paper feed table 2 and are picked, and are fed one by one to a platen 6 by a pick driven by a motor 3 via a belt 4 and a roller 5. The sheets fed one by one are fed to the platen 6, which is driven by a line feed motor (hereinafter referred to as LF motor) (not shown), and a plurality of guide rollers that are in pressure contact with the platen 6. 7 and moves as the platen 6 rotates, printing is performed, and the sheets are ejected while being held between two paper ejection rollers 8 and stacked on a paper ejection table 9. This paper discharge roller 8 is driven by a belt 13 via a gear 10 fixed coaxially with the platen 6, a gear 11 meshing with this gear 10, and a pulley 12 fixed coaxially with this gear A711. It was supposed to be done.

[Problems in the Background Art] - In the conventional printer paper feed/discharge device configured as described above, the drive source for the paper discharge roller 8 is the LF motor which is the drive source for the platen 6. , extra torque is required to drive the paper ejection row 58, and the L
This has the disadvantage that the F motor is large and the cost of the printer as a whole is high.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and does not depend on the printer as a driving source for the paper feed/discharge device.

The purpose is to provide a small and inexpensive printer.

[Summary of the Invention] The present invention uses a motor that drives the paper feed/discharge device of a printer as a motor separate from the LF motor for driving the platen, and by rotating this motor in forward and reverse directions, the motor drives the pickup roller or the paper through a one-way clutch. The desired purpose is achieved by selectively driving one of the paper ejection rollers.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. An embodiment of the present invention is shown in FIGS. 2 and 3. In these figures, parts that are the same as those shown in FIG. 1 are designated by the same numbers. FIG. 2 shows the configuration of an embodiment of the present invention, in which sheets 1 are stacked and stocked on a sheet feed tray 2, and a pickup roller 5 is disposed so as to press against the sheets 1.

A platen 6 is provided below the paper feed tray 2 via a guide plate 14.
The platen 6 is driven by an L motor (not shown), and a plurality of guide rollers 7 move the platen 6 so that the paper 1 is held between them.
is provided in pressure contact with the outer periphery of the Two paper ejection rollers 8 are disposed above the platen 6 at a position corresponding to the traveling direction of the paper 1, and are configured to sandwich the advancing paper 1 and eject it to the paper ejection table 9. It has become. FIG. 3 shows a drive mechanism for the pickup roller 5 and the paper discharge roller 8. A gear A715 and a one-way clutch gear 16 are fixed to the rotating shaft 3a of the motor 3.
A clutch plate shaft 17a is fixed coaxially and rotatably with the clutch plate shaft 17a. A clutch plate 17 is fixedly attached to a part of this clutch plate shaft 17a, and a clutch pawl 18 is provided on this clutch plate 17 so as to engage with and cover the clutch gear 16 against clockwise rotation. There is C. A pulley 19 is fixed to g2+ of the clutch plate shaft 17a, and the power is transmitted via the belt 4 to a pulley 5a fixed coaxially with the pickup roller 5, and only when the motor 3 rotates clockwise. It is configured to prevent the pickup roller 5 from rotating clockwise. Also, the gear A715
is equipped with a gear X720 that meshes with this.

Similar to the gear 15, a one-way clutch gear 22 is fixed to this gear A720 via a rotating shaft 21.

A clutch plate shaft 23a is fixed coaxially and rotatably with this rotation shaft 21. A clutch plate 23 is fixed to a part of this clutch plate shaft 23a, and a clutch pawl 24 is provided on this clutch plate 23 so as to engage with the clutch gear 22 against counterclockwise rotation. It has become. A pulley 2 is attached to one end of the clutch plate shaft 23a.
5 is fixedly installed, and the power is transmitted via a belt 26 to a pulley 8a fixedly installed coaxially with the paper ejection roller 8, and the paper ejection roller 8 is rotated counterclockwise only when the motor 3 rotates counterclockwise. It is configured so that it can be rotated.

The operation of an embodiment of the present invention configured as described above will be described below. By rotating the motor 3 clockwise, the clutch pawl 18 engages the one-way clutch gear 1716, and the paper 1 stacked on the paper feed table 2 is transferred to the pickup roller via the pulley 19, belt 4, and pulley 2a. 19, Belt 4, pulley rotates, paper 1 one by one
Pick it up and send it to Shiraten 6. At this time, the clutch gear 1722 on the paper ejection roller 8 side is not engaged with the clutch 24 and is rotating idly, and the paper ejection roller 8 is stopped.

When the pickup roller 5 completes picking up the paper 1, the motor 3 starts rotating in reverse, and the clutch gear 2
2 engages with the clutch pawl 24, the clutch plate 23 rotates counterclockwise, and the pulley 251. Belt 26, pulley 8a
The paper discharge roller 8 rotates counterclockwise via the paper discharge roller 8 to discharge the paper 1 printed on the platen 6 onto a paper discharge table 9. At this time, the clutch gear 16 on the side of the pickup roller 5 is not engaged with the clutch 18 and is spinning idly, and the pickup roller 5 is stopped. By rotating one motor 3 in the forward and reverse directions as described above, either the lift-up roller 5 or the paper ejection roller 8 can be driven to feed and eject paper.

In this embodiment, a one-way clutch is used as the transmission mechanism for forward and reverse rotation of the motor, but a transmission opening/closing mechanism such as a friction plate may also be used. In addition, if the printer 3 is a pulse motor, it performs forward and reverse rotation in synchronization with the printer's LF motor, and if it is not a pulse motor, the feed amount of the paper ejection roller 8 is slightly larger than the feed amount of the platen 6. I'll keep it.

[Effects of the Invention] As described in detail above, according to the present invention, the pickup roller and the paper ejection roller are driven by the printer, and the drive of the pickup roller and paper ejection roller is performed by one independent motor in the forward and reverse directions via a one-way clutch, without relying on the motor. By doing so, the load on the LF-E printer can be reduced, and this LF-E printer can also be made smaller, making it possible to make the printer itself more compact and at lower cost. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of a conventional printer paper feed/discharge device, FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the printer paper feed/discharge device according to the present invention, and FIG. FIG. 3 is a perspective view showing details of the drive mechanism shown in FIG. 2; 1...Paper 3...Motor 5...Pickup roller 6...Platen 8...
Paper ejection roller 15.20...Gear 4 16.22...-One-way clutch gear V17.23
°...Clutch plate 18.24...Clutch claw Representative patent attorney Norichika Kensuke (and one other person)

Claims (1)

[Claims] In a paper feed/discharge device for a printer, which includes a pickup roller that feeds paper to a platen of the printer, and a paper discharge roller that discharges the paper after printing from the platen, the pickup roller and the paper discharge roller are connected to the The platen is driven by a motor that drives the platen and another motor that drives each via a one-way clutch, and by forward and reverse rotation of this motor, only one of the pickup roller and the paper ejection roller is selectively driven. The printer's paper feed and ejection device.