JPH0211490B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a paper sheet feeding device for paper sheet processing devices such as facsimile machines, printers, automatic form processing devices, and copying machines, and particularly for paper sheet feeding devices for paper sheet processing devices such as facsimile machines, printers, automatic form processing devices, and copying machines. This invention relates to a paper sheet feeding device that exhibits a remarkable effect on sheets.

[Background of the invention]

2. Description of the Related Art Conventionally, there is a paper feeding device that uses frictional force to separate and convey paper sheets stacked on a hopper one by one, as disclosed in, for example, Japanese Patent Laid-Open No. 56-88038. A basic configuration diagram of the friction type separation mechanism of this device is shown in FIG. 1, and an external view thereof is shown in FIG.

In this separation mechanism, when there are no sheets in the sheet separation section consisting of a feed roller 1 and a separation roller 2, the separation roller 2 is rotated following the feed roller 1, and when the sheet is sent to the sheet separation section. However, the large resistance force at the tip of the paper does not work.

Therefore, even thin paper sheets with low rigidity are bitten by the feed roller 1 and separation roller 2 without buckling, and smoothly reach the paper sheet separation section.

The presser roller 5, sliding clutch 8, idle roller 3, and coil spring 9 are rotatably attached to the intermediate shaft 18. The coil spring 9 also has the function of pressing the idling roller 3 against the presser roller 5 via the sliding clutch 8. The pressing force can be changed by moving the adjustment ring 10 in the axial direction. Therefore, the slipping clutch that occurs there will naturally change.

The presser roller 5 is pressed against the conveyance roller 4 by a spring or the like and rotates as a result of the conveyance roller 4.

The separation roller 2 is pressed against the feed roller 1 and the idling roller 3 by its own weight.

The feed roller shaft 19 and the conveyance roller shaft 21 are rotated in the paper feeding direction by the motor 11 via a belt and a pulley. 6 and 7 indicate an upper guide and a lower guide.

The operation of this separation mechanism will be explained below.

By starting the drive motor 11, the conveyance roller 4 and the feed roller 1 are rotated in the sheet conveyance direction, and the separation roller 2 and the presser roller 5 are driven accordingly.

When a sheet of paper enters the sheet separation section, the slip clutch 8 slips and the separation roller 2 rotates normally as the sheet is being conveyed. In addition, there are 2
When more than one sheet of paper is inserted, the sliding clutch 8 does not slip, and the rotational force of the conveying roller 4 is transmitted to the separating roller 2 via the presser roller 5, the sliding clutch 8, and the idling roller 3. is reversed with respect to the sheet transport direction. By rotating the separating roller 2 in the reverse direction, the other sheets except for one sheet on the feed roller side are pushed back from the sheet separating section, thereby preventing multiple sheets from being fed.

However, this separation mechanism has the disadvantage that when automatically feeding multi-sheet sheets in which multiple sheets of thin paper are glued together at the edges, paper deformation and paper distortion may occur, resulting in jams. have. In order to specifically explain the problem, FIGS. 3a and 3b schematically show the operation of the separating mechanism and the deformed state of the paper.

In FIG. 3a, by rotating the feed roller 1 in the direction of arrow A, the sheet 12 (multi-copy sheet) is moved in the sheet transport direction, and as a result, the separation roller 2 is moved in the direction of arrow B. Rotate. Further, the idling roller 3 is driven by the separation roller 2, and the arrow C
Rotate in the direction. On the other hand, the presser roller 5 is driven by the conveyance roller 4 and rotates in the direction of arrow E. Therefore, slipping occurs in the slipping clutch 8 shown in FIG.

As time passes, the paper sheet 12 (multiple sheets) moves and is caught between the conveyance roller 4 and the presser roller 5 as shown in FIG. 3b.

Since the frictional force generated between multiple sheets is small, the third
As shown in Figure b, the slip clutch does not slip and the presser roller 5 rotates in the opposite direction in the E' direction. When such rotation occurs, a force, ie, a resistance force, acts on the sheet 12 (multiple sheets) in a direction opposite to the conveying direction. Also,
Since the conveying roller 4 is rotating in the D direction, a conveying force acts on the sheet 12 (multi-copy paper) on the side of the conveying roller 4. Therefore, the paper sheet 12 (multi-copy paper) is deformed as shown in FIG. 3b. In the end, only the paper sheets on the presser roller 5 side remain at that position, and the other paper sheets are conveyed, resulting in problems such as jams.

Furthermore, a separation mechanism using a slip clutch has a relatively complicated structure and requires many adjustment points. For example, the adjustment of the slip torque generated in the slip clutch, the pressing force between the feed roller 1 and the separation roller 2, the pressing force between the separation roller 2 and the idling roller 3, the pressing force between the conveyance roller 4 and the presser roller 5, etc. . If the balance between the pressing force and the sliding torque is lost, each roller will not move normally and the separation performance will deteriorate.

Particularly in the case of thin paper, since the paper itself has low rigidity, it is susceptible to the effects of the slipping torque and pressing force, and if the balance is lost, jams are likely to occur.

[Purpose of the invention]

The present invention has been made based on the above-mentioned matters, and from among the paper sheets loaded on the hopper,
It is an object of the present invention to provide a high-performance sheet feeding device that reduces problems such as jamming, wrinkles, and curvature that occur when reliably separating and feeding the uppermost sheet one by one.

[Summary of the invention]

The present invention is characterized by a feed roller disposed on a first drive shaft, a separation roller that is in pressure contact with the feed roller, and a separation roller that is rotatably disposed on an intermediate shaft and is in pressure contact with the above-mentioned separation roller. and an idling roller,
It is equipped with a presser roller disposed on an intermediate shaft on which the idling roller is disposed, and a conveyance roller that is in pressure contact with the presser roller and disposed on a second drive shaft. A rotational force is externally applied to the presser roller so that it rotates reliably in the leaf conveyance direction.

[Embodiments of the invention]

Embodiments of the paper sheet feeding device of the present invention will be described below with reference to FIGS. 4 and 5.

The basic configuration diagram of the present invention is shown in Fig. 4, and the external view is shown in Fig. 5.
As shown in the figure.

In FIGS. 4 and 5, the same reference numerals as in FIGS. 1 and 2 indicate the same parts. The feed roller 1 is made of a friction member and has a feed roller shaft 19.
is attached to. Further, the conveyance roller 4 is formed of a friction member, and is attached to the conveyance low shaft 21. These shafts 19 and 21 are rotated by the motor 11 via belts and pulleys in the sheet transport direction.

On the other hand, the presser roller 5, sliding clutch 8, idle roller 3, and coil spring 9 are rotatably attached to the intermediate shaft 18. This coil spring 9
has the function of pressing against the presser roller 5 via the idling roller 3 and the sliding clutch 8. The pressing force can be changed by moving the adjustment ring 10 in the axial direction, and the sliding torque generated therein can be changed.

Although not shown, the aforementioned presser roller 5 is pressed against the conveyance roller 4 by a spring or the like.

The separation roller 2 is attached to a roller shaft 20, and the separation roller 2 is attached to the feed roller 1 by its own weight or a spring.
and is pressed against the idling roller 3.

A back-up roller 24 formed of a friction member is disposed in pressure contact with the aforementioned presser roller 5 as a means for applying rotational force to the presser roller.

This backup roller 24 has a roller shaft 2.
3, and is rotated by a motor 11 in the sheet conveying direction via a belt and a pulley.

By driving the motor 11, the feed roller 1, the conveyance roller 4, and the back up roller 2 are
4 rotates in the sheet conveyance directions A, D, and H, respectively, and the separation roller 2 and presser roller 5 are driven to rotate accordingly.

That is, the separation roller 2 is driven by the feed roller 1 and rotates in the B direction. In addition, the presser roller 5
is the transport roller 4 and the back-up roller 24.
It is driven by and rotates in the G direction. Therefore, if a sheet is not inserted into each roller, it will slip on the slip clutch 8.

In this way, since the feed roller 1 and the separation roller 2 are in a jammed state, the problem of abrasion of the rollers is alleviated. Next, the stacked paper sheets 12
The lowest sheet of paper is caught in a sheet separating section composed of a feed roller 1 and a separating roller 2.

When one sheet of paper is inserted into the sheet separation section, the separation roller 2 moves in the B direction via the conveyed sheet.
Further, since the press roller 5 is driven by the back up roller 24 and rotates in the G direction, it slips between the slip clutches 8. In addition, when two or more sheets are inserted into the sheet separating section, the rotational force of the back up roller 24 is applied to the presser roller 5, the sliding clutch 8, and the idling roller 3 to separate the sheets without causing them to slip on the sliding clutch 8. Since the separation roller 2 is transmitted to the roller 2, the separation roller 2 reverses in the C direction with respect to the sheet conveyance direction. By rotating the separating roller 2 in the reverse direction in this manner, the other sheets except for one sheet on the feed roller 1 side are pushed back from the sheet separating section, thereby preventing multiple sheets from being fed.

Next, a case where multiple copies of paper are automatically fed will be described.

Even if multiple sheets of one block are caught in the sheet separation unit, the separation roller 2 will move in the direction B as the multiple sheets move due to the strength of the top glue (gluing the tips of the sheets). be rotated. However, when two or more blocks of paper are caught in the paper sheet separation section, the rotational force of the back up roller 24 is
Since the force is transmitted to the separation roller 2 via the slip clutch 8 and the idle roller 3, the separation roller 2 reversely rotates in the C direction. Therefore, 1 on the feed roller 1 side
Except for the multiple sheets of the block, other multiple sheets are pushed back from the sheet separation section to prevent multiple sheets from being fed.

The separated multiple sheets of one block are then caught between a conveyance roller 4 and a presser roller 5. At this time,
In the prior art, as shown in FIG. 3B, the presser roller 5 rotates in a reverse direction in the E direction with respect to the sheet conveyance direction, which causes paper deformation, jamming, etc.

In the present invention, as shown in FIGS. 4 and 5, even special paper such as multi-copy paper can be stably separated and conveyed by preventing the presser roller 5 from rotating in reverse.

In other words, the backup roller 24 is connected to the motor 1.
1 in the H direction, a rotational force is applied to the presser roller 5 to ensure that it rotates in the G direction. Due to this, when multiple sheets are caught between the conveyance roller 4 and the presser roller 5, the conveying force acts on the uppermost sheet and the lowest sheet of the multiple sheets, which has been a problem in the past. Deformation of multi-copy paper,
Distortion, jamming, etc. can be prevented. It is then transported to the subsequent process.

The present invention is not limited to the embodiments described above and shown in the drawings, but can be modified in various ways without changing the gist thereof.

For example, in the drawing, a back-up roller is pressed against the presser roller to apply rotational force to the presser roller, but there are other easy ways to apply rotational force to the presser roller, such as using a belt to rotate the presser roller. It can be considered.

〔Effect of the invention〕

According to the present invention, it is possible to prevent multiple paper feeding and jams, especially for thin paper, and when feeding multi-sheet paper in which a plurality of thin paper sheets are glued at the tips of the paper sheets. It is possible to reduce and improve problems such as jams, wrinkles, and paper deformation. Therefore, according to the present invention, it is possible to obtain a highly reliable sheet feeding device that has a very wide range of applications.

[Brief explanation of drawings]

Figures 1 and 2 show the configuration of a conventional sheet feeding device, with Figure 1 being a cross-sectional view, Figure 2 being a perspective view, and Figures 3a and 3 b conveying multiple sheets of paper. 4 and 5 show an embodiment of the sheet feeding device of the present invention, and FIG. 4 is a sectional view,
FIG. 5 is a perspective view thereof. DESCRIPTION OF SYMBOLS 1... Feed roller, 2... Separation roller, 3... Idle roller, 4... Conveyance roller, 5... Press roller, 8... Slip clutch, 9... Coil spring, 12... Paper sheet, 2
4... Backlash Prora.

Claims (1)

[Claims] 1. Feed roller 1 disposed on first drive shaft 19
a separation roller 2 that is in pressure contact with the feed roller 1; an idling roller 3 that is rotatably disposed on the intermediate shaft 18 and that is in pressure contact with the separation roller 2; and a presser roller that is rotatably disposed on the intermediate shaft 18. 5, and a sliding clutch 8 disposed on the intermediate shaft 18 and interposed between the idle roller 3 and the presser roller 5.
and the presser roller 5 disposed on the second drive shaft 21.
and a conveyance roller 4 that presses against the presser roller 5, and means 24 is engaged with the presser roller 5 to apply a rotational force to the presser roller 5 in the sheet conveyance direction (G direction) when the sheet is fed. Characteristic paper feeding device.