JPS6142205Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Technical field of the invention This invention is a sheet feeding mechanism of a sheet feeding device used in form handling devices such as optical character readers (OCR) and mark readers (OMR). Regarding improvements.

(B) Background of the technology In a sheet feeding device as shown in FIG. 1, which is used in document handling devices such as OCR devices and OMR devices, sheets 2 stacked on a hopper 1 are fed out by a feeding roller 3. The sheets are fed onto the traveling path 6 one by one by the separation roller 4 and the belt 5.

After the sheet 2 is sent to a processing section 8 by a roller 7 and subjected to a predetermined process, the sheet 2 is run and stored in a stacker 9. In addition, 10 is Statzka 9
This is a switching valve for distributing.

In the above device, when the sheets 2 are fed out from the hopper 1 one by one, for example, the device is stopped at one stage and all the sheets 2 on the running path 6 are continuously ejected and stored in the stacker 9 one at a time. It is necessary to process the sheets 2 again by placing them on the hopper 1 without changing their order.

The method of ejecting all the sheets 2 on the running path 6 is to stop the rotation of the delivery roller 3, rotate all the rollers 7 below the separation roller 4, and discharge the sheets 2 on the running path 6 to the stacker 9.

(C) Prior Art and Problems FIG. 2A is a cross-sectional view showing the structure of a feed-out roller section according to the prior art. The feed-out roller 3 has a rubber roller surface with a one-way clutch 11 built therein. A shaft 12 engaged with the one-way clutch 11 is supported by a bearing 14 in a frame 13, and rotation of the shaft 12 is controlled by a belt 16 via an electromagnetic clutch 17 and a pulley 15.

The one-way clutch 11 transmits rotation to the feed roller 3 only when the shaft 12 rotates in a predetermined direction.

On the other hand, when the feed roller 3 rotates in a predetermined direction, only a small rotational torque is transmitted to the shaft 12 due to the viscosity of the oil inside the one-way clutch. Note 18
1 is an electromagnetic clutch support plate, and 19 is a sensor.

In the above structure, when the sensor 19 detects the sheet 2' fed out by the feeding roller 3, the excitation of the electromagnetic clutch 17 is stopped, and the separating roller 4 and the following are rotated without rotating the shaft 12. As shown, the sheet 2' whose leading end has already entered the separation roller 4 causes the feed roller 3 to
is rotated, and the rotation causes one-way clutch 11
The viscosity of the oil is transmitted to the shaft 12, increasing the inertia of the entire system of feeding rollers, including the feeding roller and shaft (including the clutch friction plate). Originally, the next sheet 2 would not be fed out by the inertia of the feeding roller 3 alone, but the next sheet 2 would not be fed out due to the inertia of the entire feeding roller system.
is sent out to the separation roller 4. Thereafter, by repeating this process, there was a problem that all the sheets on the hopper 1 were fed out.

(D) Purpose of the invention The purpose of this invention is to stop the device and discharge the sheets on the travel path by rotating the rollers below the separation roller, such as when feeding two sheets. An object of the present invention is to provide a sheet feeding mechanism in which a feeding roller is the only system rotated by friction.

(E) Structure of the invention According to the invention, this purpose is to provide a sheet feeding mechanism characterized by providing a brake mechanism using friction or the like on a shaft that engages with a one-way clutch built into a feeding roller. This is achieved by providing

(F) Example of implementation of the idea Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a sectional view showing one embodiment of the sheet feeding mechanism according to the present invention. In Figure 3, the second
Components that are common to the figures are given the same symbols, 3 is a feeding roller, 11 is a one-way clutch, 12 is a shaft, 1
3 is a frame, 14 is a bearing, 15 is a pulley, 16 is a belt, 17 is an electromagnetic clutch, 18 is a support plate for the electromagnetic clutch 17, 19 is a brake mechanism, the shaft 12 is the viscosity of the oil of the one-way clutch 11, and the feeding roller 3 The seat is prevented from being rotated through the seat. In this embodiment, a permanent magnet 19 is provided at the end of the shaft 12 that engages with the one-way clutch 11 on the opposite side to the feeding roller 3.
A brake mechanism is used to fix the shaft 12. Note that 20 is a support plate.

In the above mechanism, the pulley 15 is constantly idly rotated on the shaft 12 by the belt 16, and the feed roller 3
has stopped. When feeding out the sheet 2 from the hopper 1, the electromagnetic clutch 17 works and the pulley 15
The rotation is transmitted to the shaft 12 to rotate the feed roller and feed the sheet to the separation roller 4. In addition, in order to discharge the sheet 2 from the traveling path 6 when the apparatus is stopped due to two-sheet feeding, etc., a separation roller 4 is used.
When the following rollers 7 are rotated, the separation roller 4
When sheet 2' that is stuck in is fed,
Conventionally, the system rotated by friction with the sheet 2' consisted of a feeding roller 3 and a shaft 12, but in this embodiment, the rotation of the shaft is stopped by a brake mechanism, and only the feeding roller 3 is used. Therefore, the feeding roller 3
Since the inertia of is small, the next sheet 2 will not be sent out to the separation roller 4.

In the above embodiment, the torque of the permanent magnet of the brake mechanism 19 was 2 kg/cm, and the torque of the electromagnetic clutch 17 was 5 kg/cm. However, since the torque of the permanent magnet is not so large, the electromagnetic clutch is a conventional one. That was enough. Also, a friction brake may be used instead of a permanent magnet.

(G) Effects of the invention As explained above in detail, the sheet feeding mechanism of the present invention has a brake mechanism using friction etc. on the shaft that engages with the feeding roller.
When feeding two sheets, etc., when the device is stopped and the sheets on the travel path are discharged by rotating the rollers below the separation roller, the only system that is rotated by the friction of the sheet that has entered the separation roller is the delivery roller. In particular, the next sheet is not sent to the separation roller as in the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a sectional view for explaining the outline of the sheet feeding device, Fig. 2 A and B are sectional views for explaining the conventional sheet feeding mechanism, and Fig. 3 is a sectional view for explaining the sheet feeding mechanism of the present invention. FIG. 3 is a cross-sectional view for explaining an example. In the figure, 3 is a feeding roller, 11 is a one-way clutch, 12 is a shaft, 13 is a frame, and 14 is a one-way clutch.
is the bearing, 15 is the pulley, 16 is the belt, 1
7 is an electromagnetic clutch, 18 is a support plate, 19 is a permanent magnet, and 20 is a support plate.

Claims (1)

[Scope of utility model registration request] In the sheet feeding mechanism that feeds the sheets stacked on the hopper to a separating roller by a feeding roller with a built-in one-way clutch and separates the sheets one by one, a brake mechanism is attached to the shaft that engages with the one-way clutch built into the feeding roller. A sheet feeding mechanism characterized by being provided.