JPS583887A - Paper feeding mechanism for printer - Google Patents

Abstract

PURPOSE:To obtain a reversible paper feed mechanism with a small number of parts by providing a planetary gear between a paper feed member mounting on a driving shaft and an internally geared gear that is fixed to the driving shaft. CONSTITUTION:When a paper feed roller 17 performs ordinary paper feeding as it rotates in the direction as a shaft 10, a spring 18 slackens and the paper feed roller 17 is stationary and the driving shaft idles at the time when a claw 13 meshes with a gear 11. At this time the claw 14 and the gear 12 do not mesh. Motion that urges to eliminate slack in the spring is generated and the paper feeding roller is rotated by one tooth of the complex gear 11 by releasing the claw 13 from the gear 11 by a solenoid 16. In the reverse rotation, electric current is applied to a solenoid 15, and the gear 12 is fixed at a specified position by meshing the claw 14 with the gear 12, and the rotation of a internally geared gear 9 becomes reverse through a planetary gear 20 and it is transmitted to the gear 11. The driving shaft that is rotated in the direction so as to slacken the spring 18 goes into idling and the complex gear 11 stops reverse rotation, and the paper feeding roller also rotates reversely by means of a hook 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding mechanism for a reversible printer.

In the paper feed mechanism in a conventional printer, in addition to the paper feed roller 1 and drive wheel 5, a reduction wheel 4 and a drive transmission wheel 3 are provided, as shown in the example shown in FIG.
When attempting to reverse the speed reduction wheel 4, which normally transmits the rotation of the drive wheel 5 directly to the paper feed roller 2, the switching lever 7 is actuated by energizing the solenoid 8, so that the speed reduction wheel 4, which normally transmits the rotation of the drive wheel 5 directly to the paper feed roller 2, is switched to the drive transmission wheel 3. The combination is intended to reverse the paper feeding roller 2, and it requires a large number of parts and a large space for the mechanism, and the solenoid also requires a strong magnetic force, making it costly. The drawback was that it was expensive.

An object of the present invention is to provide a reversible paper withdrawal mechanism that does not require any shafts other than the drive shaft, reduces the number of parts, accommodates the mechanism in a small space, and is reversible.

FIG. 2 will explain the present invention based on the drawings.

In FIG. 3, a rotatable paper feed roller 1 is mounted on a drive shaft 10.
7 and a composite wheel 11 are mounted thereon, and a clutch spring 18 is provided inside between them through a shaft 10. The tip of a spring 18 is embedded in and connected to the roller 17 and the composite gear 11, respectively. The internal gear 9 is fixed to a drive shaft 10, and an idling gear 20 is installed between the internal gear 9 and the composite gear 11. Yuho gear 2
0 is a type gear 12 that can rotate around the composite gear 11
is installed on. The pawl 13Fi usually rotates the paper feed roller by one tooth of the interlocking gear 11 using the rendoid 16, and the pawl 14 is in a standby state and does not mesh with the gear 12. Further, the hook 21 is provided for the purpose of hooking and rotating the paper feed roller 17 and preventing the clutch spring 18 from becoming too loose. The paper press roller 19 is mounted on the paper feed roller 17 in such a manner as to press it in the direction of the shaft 10.

In the case of the paper feeding mechanism as described above, it can be accommodated in a small space on the drive shaft 10 on the side of the paper feeding roller, and a small and reversible paper feeding mechanism can be obtained.

The operation of the present invention will be described in detail below based on embodiments.

In the paper feeding mechanism, when the paper feeding roller 17 rotates in the same direction as the shaft 10 and normally feeds the paper,
When the pawl 13 is engaged with the gear 11, the spring 18 is loosened, the paper feed roller 17 is stationary, and the drive shaft is idle. At this time, the pawl 14 is on standby and does not mesh with the gear 12, and the planetary gear 20 and the mold gear 12 are in a free state. Then, by releasing the pawl 13 from the gear 11 by the solenoid 16, an operation to eliminate the slack of the spring occurs, thereby rotating the paper feed roller by one tooth of the composite gear 11.

Next, during reverse rotation, the solenoid 15 is first energized and the pawl 14 is engaged with the gear 12, so that the gear 12 is fixed in a fixed position, and the internal gear 9 is rotated in the opposite direction via the planetary gear 20. and is transmitted to the composite gear 11. At this time, since rotational force is applied in the direction of loosening the spring 18, the drive shaft 1
0 becomes an idle state, and the compound gear 11 starts to rotate in reverse, and the hook 21 causes the paper feed roller to also rotate in reverse.

As explained above, our BA has a paper feed reversing mechanism attached to the paper feed roller side on a single drive shaft, making it simpler and with fewer parts than the conventional mechanism. It has the advantage that it can be made smaller and that the paper feed can be reversed extremely quickly due to its structure that uses planetary gears.

[Brief explanation of the drawing]

FIG. 1 shows a reversing mechanism in a conventional paper feeding mechanism. 1...Paper feed roller 2...Paper press roller 3...
Drive transmission vehicle 4... Reduction vehicle 5... Drive vehicle
6...Return spring 7...Switching lever 8...Renoid FIG. 2 is a cross-sectional view of a reversing mechanism showing one embodiment of the present invention. FIG. 3 is a sectional view from the front. 9... Internal gear wheel 10... Drive shaft 11...
Composite gear 12... type gear 11.14... pawl 15116... solenoid 17... paper feed row 2
18...Clutch spring 19...Paper presser roller
20... Planetary gear 21... Hook 22.
25...Return spring and above Applicant: Shinshu Seiki Co., Ltd. Agent Patent Attorney Mogami Written amendment of administrative procedures (spontaneous) October 1981 161j Dear Commissioner of the Japan Patent Office 1, Indication of Case Patent Application No. 101748 of 1982 2. Name of the invention Printer's paper feed p mechanism 3. Contact information for the person making the amendment: 563-2111 Circle line 223-6 Procedural amendment written by Hase in charge (voluntary) Claims have been revised as follows (correction: In the feeding mechanism, the paper feeding member is thrown onto the shaft of the private school, and a swinging tooth is fixed to the sliding shaft, and a swinging tooth is thrown into the cabinet of the nine-round toothed tooth, thereby reversing the drive of the above-mentioned 娨IIIwIA. The paper feed mechanism of the printer is configured to transmit the information to the paper feed 9 member as the 4I feature.''

Claims (1)

[Claims] In the paper feeding mechanism of the printer, the drive shaft can be driven by providing an idler gear between the nine paper feeding members installed on the drive shaft and the inner gears fixed to the drive shaft. 4111. A paper feeding machine tank of a printer, which is configured to transmit information in a reverse direction to the paper feeding member.