JPH03166136A - Sheet feeder device - Google Patents

Abstract

PURPOSE:To feed sheets of different formats smoothly without any skew on practical point of view by furnishing a skew preventive roller behind a pickup roller viewed in the sheet feeding direction, and rotating this skew preventive roller at the same circumferential speed as the pickup roller. CONSTITUTION:The skewing force due to a pickup roller 1 is set off by a skew preventive roller 2 located behind the pickup roller 1 in both cases in which the pickup roller 1 is situated in the center in width direction of a sheet 90 or not depending upon the format of the sheet, and thus skew is prevented. That is, in the case the skew preventive roller 2 is driven at the same circumferential speed as the pickup roller 1 situated ahead, the two rollers 1, 2 cancel the skewing force each other owing to the sheet feeding action originating form this same circumferential speed and the pressing force of the sheet 90 generated by the skew preventive roller 2, and thereby skew is precluded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applicable to manuscript paper and photocopiers used in microfilm camera devices, copying machines, etc. The present invention relates to a paper feeding device for feeding paper such as image transfer paper in a printer, copying machine, etc.

[Conventional technology]

As a typical example of a paper feed device, as shown in FIG. 9, a paper feed cassette, a paper cassette, etc. is placed in a predetermined position, and a paper P is brought into contact with the paper surface while driving and rotating a pickup roller R to feed the paper. , normal rotation roller r1 in front of the roller
It is also known that the paper is fed forward while being handled one by one by a reverse handling roller r2.

[Problem to be solved by the invention]

However, in such a paper feeding device that feeds paper using a pickup roller, as shown in FIG. When using feeding, when the paper size is as shown by the solid line in the figure, the conveyance force of the pickup roller R acts on the center of the paper in the width direction B, so this conveyance force acts almost uniformly on the paper. The paper is smoothly fed in the paper feeding direction A. On the other hand, when the paper size is large as shown by the two-dot chain line, the conveyance force of the pickup roller R acts intensively on one end of the paper, so the conveyance force acts unevenly on the paper and the paper is Combined with the frictional force between the two, the force shown by arrow m in the figure (force that causes skew)
occurs. As a result, the paper is misaligned, twisted, etc. (hereinafter referred to as "skew") with respect to the original paper feeding direction.
One way to prevent such paper skew is to install multiple pickup rollers in advance in a direction perpendicular to paper feeding direction A (paper width direction B), but if the paper has a wide variety of sizes, the number of rollers is small. Even if the number of rollers were increased, it would be expensive and it would be difficult to determine the roller positions to accommodate various paper sizes.

SUMMARY OF THE INVENTION Therefore, the present invention is a paper feeding device of a type that feeds paper using a pickup roller, which can smoothly feed paper of various sizes without any problem of skew in practical use, and which has a simple structure. The purpose is to present a poem.

[Means to solve the problem]

In accordance with the above object, the present invention provides a paper feeding device that feeds paper by a pickup roller, in which a skew prevention roller is provided behind the pickup roller in the paper feeding direction and parallel to the roller, and the skew prevention roller has the same circumferential speed as the pickup roller. A paper feeding device configured to be able to be driven and rotated by a pickup roller, and a paper feeding device that feeds paper by a pickup roller, wherein a skew prevention device is provided parallel to the q-ra behind the pickup roller in the paper feeding direction. There is provided a paper feeding device characterized in that a roller is provided so as to be freely reversible, and the center line positions of the pickup roller and the skew prevention roller in the paper feeding direction are made to coincide with each other in the rotational axis direction of these rollers.

(Function) According to the present invention, regardless of whether the pickup roller is located at the center in the width direction of the paper depending on the paper size or not, the above-mentioned skew force caused by the pickup roller is applied to the skew prevention roller behind the roller. , and skew is prevented. More specifically, when the skew prevention roller is driven at the same circumferential speed as the front pickup roller, due to the paper pressing force of the skew prevention roller and the paper feeding action due to the same circumferential speed,
Both rollers cancel each other's skewing forces, thereby preventing skewing.

When the skew prevention roller is freely rotatable, the center line position of the roller in the paper feeding direction and the center line position of the front pickup roller in the paper feeding direction are defined in the direction perpendicular to the paper feeding direction (paper width direction or roller Since the skew prevention rollers press the paper surface, a force that cancels out the skew force acts between both rollers, and skew is prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are all used to automatically feed originals to the microfilm camera device shown in FIG. Figure 1 shows a side view of the main part of one embodiment, and
The figure shows a plane view of the main part of the same embodiment.

The embodiment shown in FIGS. 1 and 2 includes a pick-up roller 1 and a skew prevention roller 2 parallel to the pick-up roller 1, as well as a normal rotation roller 3 in front of the roller 1 and a reverse rotation separation roller 4 opposite thereto. Preparation, and b-ra 3, 4
A pair of front document feed rollers 3A and 3B are provided.

A pair of first frames 5, 5 are arranged in parallel on both outer sides of the pickup roller l and the normal rotation roller 3, and the shaft 11 of the roller 1 and the shaft 3l of the roller 3 are connected to these frames 5, 5, respectively.
5 so that it can rotate freely.

A second frame 6 is arranged outside each first frame 5, and both frames 6, 6 extend parallel to both outsides of the pickup roller l and the skew prevention roller 2.

The shaft 11 of the roller I extends to the frames 6, 6 and is rotatably fitted in the frames. The shaft 21 of the skew prevention roller 2 is also rotatably fitted in the frames 6, 6.

Rollers 1, 2 and 3 all have the same outer diameter and the same roller width.

A pulley 32 is fixed to the shaft 31 of the normal rotation roller 3, and a pulley l is also attached to the shaft 11 of the roller l in correspondence with the pulley.
2 is firmly fixed, and an endless belt 7 is wound around these two boobies 32 and l2.

Another pulley l3 is fixed to the shaft 1l of the roller 1, and correspondingly a bobbin 22 is fixed to the shaft 2l of the roller 2, and the endless belt 8 is wound around both pulleys 13 and 22. It is being

Therefore, when the shaft 31 of the roller 3 is driven to rotate the roller 3, the reroller I and the roller 2 are also driven and rotated in the same direction as the roller 3 by the two belt transmission devices. Each belt transmission device is constructed so that the circumferential speeds of rollers 1 and 2 are the same and that their circumferential speeds are slightly slower than the circumferential speed of roller 3. The shaft 3l of the normal rotation roller 3, the shaft 4l of the reverse separation roller 4 opposing the normal rotation roller 3, and each shaft of the original transport rollers 3A and 3B are all driven by a motor via a transmission device (not shown). The driving direction is the first for both shafts 31 and 4l.
The direction in the diagram is clockwise. Therefore, when the roller 3 rotates, the pickup roller l and the skew prevention roller 2
also rotates clockwise in Figure 1. Further, the shaft of the roller 3A is turned clockwise, and the shaft of the roller 3B is turned counterclockwise.

Note that the roller shafts 31, 41 and the shafts of the rollers 3A, 3B are rotatably supported by a frame (not shown).

Further, a document guide portion G is provided from the upstream side of the rollers 3 and 4 to the downstream side of the rollers 3A and 3B. A document placement table 9 is arranged below rollers l and 2. An end 91 of the platform 9 closer to the roller l is supported by a lifting drive lever 10, and an opposite end 92
is rotatably supported by a frame (not shown). The lever 10 is rotatably supported by a frame (not shown) by a shaft 101, and in the state shown in FIG. ! The tray 9 is raised to a position where the original can be fed. Lever 10 is the original! ! When placed, it can be rotated clockwise downward from the state shown in FIG. 1, thereby allowing the end portion 91 of the document table 9 to be lowered. Further, as shown in FIG. 2, a document side regulating plate 100 is provided on the side of the table 9, and this plate is also attached to a frame (not shown).

According to the paper feeding device described above, initially, the lifting drive lever 10 is turned clockwise in FIG. 1 to lower the end portion 91 of the document a placement table 9. On the other hand, the pickup roller 1 and the anti-squeeze roller 2 are lifted by hand, and the required number of originals 90 are placed on the table 9. One side edge of each document is aligned against the document side regulating plate 100. Thereafter, rollers 1 and 2 are lowered so as to come into contact with the upper surface of the uppermost document, and these rollers rest on the uppermost document by their own weight and press it.

After that, the forward rotation roller 3 and the reverse rotation roller 4 are rotated to the first position.
The pickup roller 1 and the skew prevention roller 2 are driven clockwise in the same manner. Platform 9
The upper document 90 is sent forward by the action of the pickup roller 1 and the skew prevention roller 2. When multiple originals are sent out at the same time, the action of rollers 3 and 4 causes the transport rollers 3A and 3B to feed one original at a time, starting from the top original.
The supplied document is supplied to a predetermined position of the camera device by the conveyance roller.

When the original on the original placing table 9 is sent out in this way,
Since the pressing forces of the pickup roller 1 and the skew prevention roller 2 are applied to the document, and the circumferential speeds of both rollers 1 and 2 are equal, the skew caused by both rollers cancel each other out, and the document being sent out is not skewed. The paper is smoothly sent out in a predetermined paper feeding direction A.

According to the embodiment, the pickup roller l and the skew prevention roller 2 have the same outer diameter d and the same roller width W, but these two rollers do not necessarily have the same outer diameter and the same roller width. As shown in FIG. 3, for example, the outer diameter D of the skew prevention roller 2 may be larger than the outer diameter d of the pickup roller l. However, roller 1
The circumferential speeds of and 2 are equal. Further, according to the embodiment, the roller 2 is located directly behind the roller 1, that is, the rollers l and 2.
The paper feed direction center lines CI and C2 of the rollers are arranged so that they coincide in the roller width direction and the roller rotation axis direction, but the roller 2 is located at a position offset from directly behind the roller l, as shown in FIG. It may be placed. Furthermore, in the embodiment described above, the skew prevention roller 2 is also driven in the same way as the pickup roller 1, but as shown in FIG. It may be provided. in this case,
A frame 6 in which the shaft 1l of the roller l is rotatably fitted.
Therefore, it is not necessary to rotatably support the shaft 21 of the roller 2, and the shaft 2l of the roller 2 may be rotatably supported by a separate frame. However, in these cases, the center lines of the rollers 1 and 2 in the sheet feeding direction, in other words, the center lines CI and C2 in the roller width direction are made to coincide with each other in the roller radial direction B.

In other words, roller 2 is placed directly behind roller l. As long as such an arrangement is adopted, the width of roller 2 may be larger or smaller than the width of roller 1, as shown in FIG. 6, and the outer diameters of roller 1 and roller 2 may be different. .

When the roller 2 is freely rotatable as described above, the pressing force due to the weight of the roller 2 acts on the document, so the skewing force caused by the pickup roller l is canceled by the roller 2.

Note that when the roller 2 is provided to freely rotate, the roller 2
7 (1) and (2>), when the document is placed at a position shifted from directly behind the roller 1, a force F and a moment M are applied as shown by the arrows in the figure, and as a result, the document becomes skewed. Therefore, such an arrangement must be avoided.The outline of the microfilm camera device (see Fig. 8) to which the paper feeding device of the above embodiment is applied is as follows. A document holding glass 1la is provided on the base 10a, which serves as a document table, and a sheet-like document is moved onto the glass 11 by an unillustrated document conveying device built into the lower side of the glass 11.
It is transported along the bottom surface of a. A DF insertion slot 12a is formed on the upper right side of the base 10a, and originals that are manually fed one by one to a support stand 13a installed adjacent to this insertion slot 12a are inserted until they reach the bottom of the glass lla. The document is transported by the document transport device. A support table 15a having an ADF insertion port 14a is provided below the insertion port 12a, into which the above-described paper feeder according to the present invention is attached, and sheet-like originals stacked in the paper feeder are set here. are automatically conveyed one by one along the bottom surface of the glass lla from the top. However, it is also possible to place an original directly on the glass lla and imprint the image information recorded on the original. A pillar 16a is erected at the rear center of the base 10a, and a beam 17 is fixed to the tip of the pillar 16a.
The holder 18a is attached via the holder 18a.
A camera head 20 is provided on the base 1.
There are operation panels 19a and 19 at the front and rear of 0a, respectively.
b is placed.

The originals are manually inserted one by one into the DF insertion slot 12a and transported to the lower side of the glass lla by the original transport device, and the ADF paper feeder 14a is loaded one by one by the paper feeder set on the support stand 15a. Kara glass Ila
The documents conveyed to the lower side of the document are positioned so that their corners are at the positions indicated by symbols X and Y in FIG. In this way, the so-called corner alignment of the document is performed. This corner alignment is for glass l
The same is true when placing a document directly on the document la, and the image is imprinted with the corners of the document aligned with the reference positions X and Y. In order to photograph the entire image recorded on the document according to the size of the document positioned in this way, the camera head 20a is tilted in the front-rear direction and the left-right direction together with the holder 18a. It moves up and down toward the corner. Said pillar 1
6a includes arms 22a each having an illuminator 21a;
A light source is built into each illuminator 2la, and light from these illuminators 21a illuminates the glass lla.

Although the embodiment described above is used for a microfilm camera device, the present invention can also be applied to a camera device, as well as to supplying original documents to a copying machine, and supplying image transfer paper to a copying machine, a printer, and the like.

Furthermore, in the embodiment described above, the pickup roller and the skew prevention roller are individually brought into contact with the top surface of the document. It may also be brought into contact with the top surface of the document via a belt. Even with this method, it is expected that paper of various sizes can be fed smoothly without any skew problems. [Effects of the Invention] According to the present invention, a paper feeding device of a type that feeds paper using a pickup roller is capable of feeding paper of various sizes smoothly without any problem of skew in practical use, and has a simple structure. It is possible to provide a paper feeding device with a wide range of functions.

[Brief explanation of the drawing]

FIG. 1 is a side view of a main part of an embodiment of the present invention, and FIG. 2 is a plan view of the main part shown in FIG. 3 to 6 are explanatory diagrams of other embodiments, FIG. 7 is an explanatory diagram of an example of the arrangement of a defective pickup roller, and FIG. 8 is a perspective view of a microfilm camera device. Figure 9 is a side view of the conventional example;
FIG. 10 is an illustration of the occurrence of paper skew in a conventional example.
l...Pickup roller 2...Skew prevention roller 90...Document A...Paper feeding direction B...Roller rotation axis direction Cl. ．． C2...Roller center line in paper feeding direction 1 Fig. 2 Fig. 3 Fig. 5 Fig. 6 Fig. 8

Claims (2)

[Claims] (1) In a paper feeding device that feeds paper by a pickup roller, a skew prevention roller is provided behind the pickup roller in the paper feeding direction and parallel to the roller, and the skew prevention roller is driven and rotated at the same circumferential speed as the pickup roller. A paper feeding device characterized in that it is configured to be able to. (2) In a paper feeding device that feeds paper by a pickup roller, a skew prevention roller is freely rotatably provided behind the pickup roller in the paper feeding direction in parallel with the roller, and each of the pickup roller and the skew prevention roller is rotated in the paper feeding direction. A paper feeding device characterized in that the center line positions of these rollers are aligned in the direction of the rotation axis.