JPS60187572A - Paper feeder - Google Patents

Abstract

PURPOSE:To prevent an original from being staggered in the transverse direction, by a construction wherein a peripheral surface of a feeding roller is provided with projected parts along the circumferential direction at a predetermined interval, and an original is fed by guiding it between the projected parts. CONSTITUTION:The feeding roller 21 is so supported that it can not be rotated relatively to a shaft 7, and peripheral surfaces 10a of a plurality of idle rollers 10 rotatably supported on a shaft 8 make close contact with the peripheral surface 21a of the feeding roller 21a. The peripheral surface 21a of the roller 21 is provided with the projected parts 21b having a height H of about 1mm. along the circumferential direction of the roller 21 at predetermined intervals L, M, N, O. When the original 3 is fed by being clamped between the peripheral surface 21a of the feeding roller 21 and the peripheral surfaces of the idle rollers 10, it is guided between the projected parts 21b in accordance with each size width thereof, so that it is prevented from being staggered in the transverse direction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper conveyance device used after copying, etc., and is particularly suitable for conveying relatively large-sized originals (paper) such as AI% A4 size. The present invention relates to an improvement of a paper conveying device.

[Prior art]

FIG. 1 is a conceptual diagram of the main parts of a copying machine 2 showing a conventional paper conveying device 1. As shown in FIG.

In the copying machine 2, a relatively thick IA original 3 (indicated by a dashed line) is guided onto the platen surface of the platen 5 disposed inside the housing 4, and this original 3f: the upper surface of the housing 4 is guided. ] In order to discharge the document into the document storage tray 4a, the document 3t is
- A plurality of paper conveying devices 1 are arranged along a guiding page guide 6.

As shown in the perspective view of FIG. 1 and the enlarged front view of FIG. . In addition, the feed roller 9 and the idler roller 10 are respectively 9 a r 10 m
Further, the feed roller 9 is supported so as not to be rotatable with respect to the shaft 7, and the idler roller 10 is supported so as to be rotatable with respect to the shaft 8. The above-mentioned shaft 7 is rotated by a drive device (not shown) in the transport direction of yA sum 3, and the original is held between the feed roller 9 and the idler roller 10 and transported.

On the other hand, in the above-described copying machine 2, in order to make multiple copies (transferring the same document multiple times), the document 3 should be copied in each size in the directions indicated by arrows A, B, C, and D. The guide is made to pass over the surface of the platen 5 multiple times (FIG. 1).

By the way, when making multi-copies as described above, if the m-document 3 is rotated and passed over the platen surface of the platen 5 multiple times, it may slip between the feed roller 9 and the idler row 210 or slip against the paper guide 6. Skiing (skewing) may occur due to factors such as unevenness of the draft 3.

If the skew of the original 3 occurs in this way, move the synchronized vapor guide 11 independently on the left and right sides when viewed from the direction of arrow E (d - i on the delayed side of the original 3) f
1. Shorten the paper path and lengthen the paper path on the advancing side. I was trying to fix this.

However, when using the above-mentioned movable paper guide 11,
When the ski of fA[3 is corrected, a horizontal shift occurs in the document 3 by the amount of this correction, and the document 3 moves in its width direction, so 1. The transfer information cannot be passed at an appropriate position relative to the platen surface of the platen 5, which may cause some of the transferred information to be missing.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a paper conveyance device that prevents horizontal displacement of a conveyed document.

[Structure of the invention]

To achieve this purpose, protrusions are formed along the circumferential direction at predetermined intervals on the circumferential surface of the feed roller, and the entire document is guided between the protrusions and conveyed. This is to prevent misalignment.

〔Example〕

FIG. 3 is a front view showing the paper conveyance device 20 of the present invention, and the same parts as in FIG. 2 are designated by the same symbols.

In this paper conveyance device 20, one feed roller 21 having a predetermined length is supported on the shaft 7. This feed roller 21 is supported non-rotatably on the shaft 7, and the shaft 8 is attached to the circumferential surface 21a of the feed roller 21.
The circumferential surfaces 10a of the plurality of idler rollers 10 rotatably supported by the rollers are closely spaced. Further, on the peripheral surface 21a of the feed roller 21, there is a spacing L between the legs,
M.

A convex portion 21b of N and O having a height 11 of about 1 degree is formed along the circumferential direction of the feed roller 21.

Note that the distances M, N, and O between the convex portions 21b are the distances N
is set to A4 size width + 2 degrees, M is set to A3 size width - 2 degrees, N is set to A2 size width + 2 degrees, 0 is A, size width + 2 degrees. . It goes without saying that the spacings M, N, and O are not limited to those in the above embodiment.

According to the paper conveyance device 20 having the above-described configuration, as long as the document 3 (FIG. 1) is conveyed while being compressed between the circumferential surface 21a of the feed roller 210 and the circumferential surface 10a of the idler roller 10, According to each size width, the convex portion 21
Since the guide is guided between the gaps B, movement in the width direction, that is, lateral displacement thereof, is restricted.

In the above embodiment, one feed roller 21 is used, and the convex portions 21b are formed on the circumferential surface 21a of the feed roller 21 at predetermined intervals. However, the present invention is of course not limited to the above-described embodiment, and the paper conveying device 3 shown in the front view of FIG. 4, in which the same parts as in FIG.
0, a plurality of feed rollers 31 of the same shape each having seven rung portions 31a (convex portions) formed on one surface are prepared,
The distance between the feed roller 31 and each of the seven rungs 31a from the center of the shaft 7 is set at a certain distance.

They may be arranged facing each other so that they are M, N, and O. Note that the 7-run section 3 of this feed roller 30
The outer peripheral edge of 0a is the peripheral surface 30b of the feed roller 30
Needless to say, it is formed to protrude by about 2u from the surface. According to such a paper conveyance device [30], by using all the feed rollers 31 of the same shape and changing their arrangement positions, it is possible to easily adjust the width of the document according to the width of the document to be used.
This means that the interval between the runno portions 30a can be changed.

〔Effect of the invention〕

In the present invention, convex portions are formed at predetermined intervals on the surface of the feed roller, and one wheel is guided between the convex portions and conveyed, so that the movement of the document in the width direction is not restricted. Therefore, it is possible to prevent the document from shifting laterally and to transport the paper stably.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the main parts of a copying machine showing a conventional paper conveyance device, FIG. 2 is an enlarged front view of FIG. FIG. 4 is an enlarged front view showing another embodiment. 10-...Idler roller, 10 a t 21 a
+ 31 b=・Surrounding surface, 20.30...Paper transport device, 21.31...Feed roller, 21b, 31a
...Protrusion.

Claims (1)

[Claims] In a paper conveying device in which the circumferential surface of the feed roller and the surface of the idler roller are brought into close contact with each other, and the paper is conveyed while being compressed between the circumferential surfaces, the circumferential surface of the feed roller is provided with a sheet of paper at predetermined intervals. A paper conveyance device characterized in that convex portions are formed along the circumferential direction of the peripheral surface, and the monthly magazine is guided and conveyed between the convex portions.