JPS6374824A - Automastic paper feeder - Google Patents

Abstract

PURPOSE:To improve the capacity of a paper feeder, by making paper refeedable in the state that a lower end of the separated paper is in a paper separating part, in the case of the automatic paper feeder that separates a topmost sheet from the stacked ones and conveys them piece by piece. CONSTITUTION:A pickup roller 1 is made free of rotation together with a drive shaft 2 in design, and a solenoid clutch is attached to one end of this shaft 2, whereby driving force by a timing belt is transmitted to the shaft 2 or cut off at need. A separate roller 3 is support by a support shaft 5 via a one-way clutch, and it is being pressed to the roller 1 by a roller spring 6. Many stacked sheets 18 are being pressed to the roller 1 by a hopper spring 12 via a hopper 11 being free of rotation with a hopper shaft 15 as a fulcrum. Therefore, only a topmost sheet of paper 17 of these stacked sheets 18 is separated from the roller 3, and taken out in an A direction under guidance of paper guides 9 and 10. On the other hand, in case of refeeding, the topmost paper 17 returns to a B direction by the clutch 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic paper feeding device that separates and feeds the top sheet one by one from stacked sheets, and particularly relates to an automatic paper feeding device that separates and feeds out the top sheet one by one from stacked sheets, and in particular, even if the bottom edge of the fed paper is in the paper separating section. Paper can be fed back,
The present invention relates to an automatic paper feeder suitable for removing jammed paper without damaging the paper.

[Conventional technology]

In conventional devices, if the bottom edge of the separated and fed paper is in the paper separation section, when the paper is fed back, the friction separation method causes the paper to be caught between the separation members, causing wrinkles and damage to the paper. Also, even with the claw separation method, the alignment of the paper in the hopper may be disrupted, resulting in paper skew or double feeding of the next paper.
As described in Japanese Unexamined Patent Publication No. 59-118482, this is done by first pulling out the paper into a device consisting of a separating device, then returning the paper to a predetermined position, and guiding the bottom end of the paper to a path provided separately in the device. was.

However, the above system has the drawback that for long sheets, it takes a lot of time to pull out the sheets from the separation section and feed them back, resulting in poor throughput.

In addition, in the friction separation method, if the bottom end of the jammed paper is in the separating section, when you try to remove it from one side of the hopper, the paper will be wedged in the separating section, and if you pull it out, the paper will be damaged. Otherwise, a mechanism for opening the separation section was required.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the long size of paper when returning the paper fed from the automatic paper feeder, resulting in a significant reduction in processing capacity.Also, it does not use a friction separation method when removing jammed paper. There was a problem in that it was difficult to remove from the hopper section. It is an object of the present invention to eliminate the above-mentioned drawbacks, and it is possible to return the paper with the bottom end of the paper hanging on the paper separating section, and to pull out the paper from the separating section to the bottom end of the paper and return the paper to a predetermined position. The purpose of this invention is to shorten the processing time, improve the throughput of the device, and facilitate the removal of jammed paper from the hopper section.

[Means for solving problems]

The above purpose is to make the roller that feeds out the top paper of multiple sheets of an automatic paper feeder rotatable in both directions, and when the roller is driven, the drive is transmitted to the roller only in the paper feeding direction by a clutch attached to one end of the roller support shaft. The separating member that cooperates with the roller to separate only the topmost sheet of the multiple sheets is a roller made of an elastic material, and a roller is provided within this roller that does not rotate in the paper feed direction but rotates in the paper return direction toward the hopper. The separating roller is supported by a shaft and is pressed against the roller with a predetermined pressure, holding down the lower end of the multiple sheets in the hopper and having a plate member movable depending on the paper size. This is achieved by

[For production]

When the separation roller separates and sends out the uppermost sheet of a large number of sheets in the hopper, it does not rotate in the sending direction due to a one-way clutch in the separation roller, but cooperates with the rotation of the roller to separate and send out only the uppermost sheet. If the lower end of the fed paper is sandwiched between this roller and the separation roller and the fed paper is sent back, the drive of the roller is released by a clutch attached to the roller support shaft, and The separation roller is rotated in the paper return direction by the paper returned by a clutch within the separation roller. This makes it possible to return the paper without applying any frictional load to the separating section, and the effect of the friction of the returned paper on the paper in the hopper is reduced by the plate member provided at the lower end of the hopper. Because it is held by the paper, skew and double feed are less likely to occur even when separating and feeding out several sheets without being affected by this. Further, from the above, it becomes possible to easily remove jammed paper caught in the separating section from the hopper section without damaging the paper.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The pickup roller 1 is supported by a drive shaft 2 supported by a frame 19.degree. Transmitted to drive shaft 2,
Or disconnect. The separation roller 3 is a one-way clutch 4
The pickup roller 1 is supported by a support shaft 5 via a support shaft 5, and is pressed against the pickup roller 1 with a predetermined pressure by a roller spring 6. A large number of sheets 18 are pressed against the pickup roller 1 with a predetermined pressure by a hopper spring 12 via a hopper 11 which is rotatable about a hopper shaft 15 supported by a frame 19.20. This large number of sheets is transferred to the drive shaft 2 via the electromagnetic clutch 7 by the driving force transmitted by the timing belt 8.
rotates in the paper feeding direction A, and thereby the pickup roller 1 rotates in the paper feeding direction A. The separation roller 3 is not rotated in the paper feed direction A by the one-way clutch 4, and the multiple sheets 18 sent in the paper feed direction A by the pickup roller 1 are separated by the separation roller 3 into the uppermost paper 1.
7 is separated, guided by an upper paper guide 9 and a lower paper guide 10, and sent out in the paper feeding direction A.

On the other hand, when the lower end of the sent out uppermost paper 17 is returned in the paper return direction B with the lower end being sandwiched between the pickup roller 1 and the separation roller 3, the pickup roller 1 is moved by the electromagnetic clutch 7.
The driving force is released, and the top paper 17 rotates together with the drive shaft 2 in the paper return direction B. At the same time, the separation roller 3 is enabled to rotate in the paper return direction B by the one-way clutch 4, so the top paper 17 The return of the top paper 17 causes the paper to rotate in the paper return direction B, thereby smoothing the return of the top paper 17. A large number of sheets 18 are generated by the returned top paper 17.
However, the paper guide 13, which is fixed to the hopper 11 with a guide fixing screw 16 and pressed against the lower end of the multiple sheets 18 with a predetermined pressure by a guide spring 14, prevents the movement of the multiple sheets 18. and misalignment is prevented.

According to this embodiment, even if the lower end of the separated and fed-out top paper is in the separation section, the top paper can be smoothly returned and fed, and even if jammed paper is caught in the separation section, the paper can be returned. It has the effect that it can be easily removed from the hopper part without being damaged.

〔Effect of the invention〕

As explained above, according to the present invention, the paper can be fed back with the bottom end of the separated paper being in the paper separation section, and is added to devices that require paper back feeding for vertically enlarged character printing, etc. It is possible to improve the processing capacity. Further, in an automatic paper feeder using a friction separation method for separating thick paper, jammed paper can be easily removed from the hopper side without damaging the paper.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, and FIG. 2 is a top view of FIG. 1. 1...Pickup roller, 2...Drive shaft, 3...Separation roller, 4.One-way clutch. 5...Support shaft, 6...Roller spring. 7. Electromagnetic clutch, 8. Timing belt. 9...Paper guide top, 10...Paper guide bottom. 11...Hopper, 12...Hopper spring. 13...paper guide, 14...guide spring. 15...Hopper shaft.

Claims (1)

[Claims] 1. A roller that is in contact with the top paper of a large number of stacked sheets, is supported by a rotatable shaft, is movable in the width direction of the paper, rotates with the rotation of the shaft, and sends out the top paper; and a roller located at one end of the support shaft. It consists of a one-way clutch that transmits rotation in only one direction to the support shaft, and an elastic member that cooperates with the roller to separate only the topmost sheet of the plurality of sheets and is pressed against the roller with a predetermined pressure. In an automatic paper feeding device consisting of a separation roller and a hopper that presses a large number of sheets against the roller with a predetermined pressure, the separation roller does not rotate in the paper feeding direction but only in the opposite direction to the paper feeding direction. An automatic paper feeder comprising a rotatable one-way clutch, a plate member that holds the lower end of the paper in the hopper and is movable according to the paper size.