JPH0351249A - Paper feed device - Google Patents

Abstract

PURPOSE:To naturally turn a paper to locate the leading edge of the paper parallel with the shaft center of aligning rollers by providing a pair of the aligning rollers arranged on the same shaft on both sides of a drive roller so that they can freely rotate, and providing pressurizing bodies for keeping the paper contact with the aligning rollers under pressure. CONSTITUTION:A paper 2 is subjected to resistance from aligning rollers 14, 15 and pressurizing bodies 24, 25 on both sides of a drive roller 11. For this reason, when the paper 2 is inserted between the drive roller 11 and a paper hold-down device 23 by hand, and the tip of the paper 2 is oblique to the shaft center of the aligning rollers 14, 15, one side of the paper 2 is subjected to resistance of the aligning roller 14 (or 15) and the pressurizing body 24 (or 25) to be delayed. Thus, a turning force given to the paper 2 around the abutting part where the paper abuts on the aligning roller and the pressurizing body can be obtained as component of the inserting force of the paper. As a result, by naturally turning the paper, the leading edge of the paper can be located parallel with the shaft center of the aligning roller 14, 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device for feeding paper such as a document in a facsimile machine or a copying machine, or printing paper in a printer.

2. Description of the Related Art Conventionally, there is a paper feeding device that grips and conveys paper using a drive roller and a presser roller.

Problems to be Solved by the Invention As shown in FIG.
If the front edge of the paper 52 is inclined and the paper 52 is inserted by hand, the paper 52 will be fed in a bent state, resulting in what is called a skew. As a result, if the paper 52 is a facsimile document, the data on the document cannot be accurately read, and if it is a printer paper, the paper will come off the print area and print defects will occur.

Means for Solving the Problems In a paper feeding device that grips and conveys paper between a drive roller connected to a motor and a paper presser, a pair of alignment rollers are arranged coaxially on both sides of the drive roller. was rotatably provided, and a pressure member was provided for pressing the paper against the alignment roller.

The working paper is subject to resistance from the alignment rollers on both sides of the drive roller and the pressurizing body, so when the paper is manually inserted between the drive roller and the paper presser, the leading edge of the paper is tilted with respect to the axis of the alignment roller. In this case, one side of the paper is stagnated due to resistance between the alignment roller and the pressure body, and as a result, the rotational force applied to the paper around the contact area between the alignment roller and the pressure body on the negative side is It can be obtained as a component force from the paper insertion force, which allows the paper to rotate naturally so that its leading edge is parallel to the axis of the alignment roller.

Embodiment An embodiment of the present invention will be explained based on the drawings of a facsimile machine shown in FIGS. 1 to 4. 3 and 4 are perspective views of a facsimile machine. The main body 1 of this facsimile machine is provided with a document tray 3 that supports a document 2 made of paper. This document tray 3 has a cursor 4 that guides both sides of the document 2. and a manuscript support 5 are provided. Further, a telephone 6 is connected to the main body l.

Next, FIG. 2 shows the internal mechanism of the main body l. Upper and lower opposed frames 7.8 are provided.

A drive shaft 10 having a drive gear 9 fixed to its end is rotatably supported on the upper frame 7 via a bearing 10a.
A drive roller 11 is rotatably fitted to the drive shaft 10, and the rotation of the drive shaft 11 is controlled by the drive roller 11.
A spring clutch 12 is installed to transmit transmission to the vehicle.

Further, a pair of alignment rollers 14 and 15, each of which rotates integrally with a gear 13, is arranged on both sides of the drive roller 11 and rotatably fitted to the support shaft 10. Furthermore, screw 1
a guide plate 1 fixed to the frame 7 by 6;
A support shaft 18 is rotatably supported on the support shaft 7 , and a gear 19 meshed with the gear 13 is fixed to both ends of the support shaft 18 . Furthermore, a document sensor 20 is attached to the frame 7.

The lower frame 8 includes a motor 21 that drives the drive gear 9, and a paper presser 23 that is biased by a spring 22 and comes into elastic contact with the drive roller 11.
Leaf springs 24 and 25, which are pressurizing bodies, are provided that are in resilient contact with the alignment rollers 14 and 15. moreover,
A white roller 26 driven by the motor 21 and a roller shaft 28 to which a discharge roller 27 is fixed are rotatably held in the frame 8 via bearings 29. Pulleys 31 and 32 connected to a belt 3o are fixed to these white rollers 26 and roller shafts 28. Furthermore, a CCD sensor 33 that contacts the white roller 26 is attached to the upper frame 7.

In such a configuration, when the drive roller 11 and the white roller 26 are driven and the document 2 is manually inserted along the document table 3, the document 2 is conveyed while being held between the paper presser 23 and the drive roller 11. Furthermore, White Roller 26 and CC
The document 2 is conveyed while being held by the D sensor 33, and during this process, the image on the document 2 is read by the CCD sensor 33.

In FIG. 1, the document 2 is subjected to resistance from the alignment rollers 14, 15 on both sides of the drive roller 11 and the plate springs 24, 25, so when the document 2 is manually inserted between the drive roller 11 and the document presser 23, , the leading edge of the document 2 is aligned with the rollers 14, 1
5, one side of the document 2 receives resistance from the abutting portion of the alignment roller 14 or 15 and the leaf spring 24 or 25 and stagnates, causing the alignment roller on the negative side to stagnate. The component force that attempts to rotate the original 2 around the abutting portion between the plate spring 14 or 15 and the leaf spring 24 or 25 can be obtained from the pushing force of the original 2, and this causes the original 2 to naturally rotate and its shape. The leading edge can be parallel to the axes of the alignment rollers 14, 15. Moreover, since the left and right alignment rollers 14 and 15 are connected by a gear 19 and a support shaft 18 as rotation transmission means, if one of the alignment rollers 14 or 15 receives a braking force from the leaf spring 24 or 25, The other alignment roller 15 or 14 receives resistance in the rotational direction.

When the original 2 is inserted into both alignment rollers 14, 1'5, these alignment rollers 14, 15 rotate in the same direction and at the same speed due to the frictional force with the original 2. Therefore, when the front edge of the original 2 is bent with respect to the axes of the alignment rollers 14 and 15 and inserted, one side of the original 2 is inserted first and receives resistance from the alignment roller 14 or 15 and the leaf spring 24 or 25. At this time, the reliability of the rotation operation of the original 2, that is, the posture correction operation, using the contact portion between the minus side alignment roller 14 or 15 and the leaf spring 24 or 25 as a rotation fulcrum can be increased. Furthermore, the outer diameter of the drive roller 11 is adjusted to the alignment rollers 14, 1.
By setting the outer diameter to be equal to or larger than the outer diameter of the drive roller 5, when the document 2 is manually inserted, the conveying force from the drive roller 11 can be quickly applied to the document 2. Even in this case, if the original wS2 is inserted at an angle, the component force that tries to rotate the original 2 using the contact portion between one of the alignment rollers 14 or 15 and the leaf spring 24 or 25 as a fulcrum is driven. It can be generated from the conveying force by the rollers 11.

Effects of the Invention Since the present invention is constructed as described above, the paper receives resistance from the alignment rollers and the pressurizing body on both sides of the drive roller, so when inserting the paper by hand between the drive roller and the paper presser, If the leading edge of the paper is inclined with respect to the axis of the alignment roller, one side of the paper will stagnate due to resistance between the alignment roller and the pressure body, and this will cause the side alignment roller and pressure body to stagnate. The rotating force applied to the paper around the abutting part can be obtained as a component force from the paper insertion force, and this allows the paper to rotate naturally and its leading edge to be parallel to the axis of the alignment roller. It has the effect that it can do.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a plan view showing the main parts, Figure 2 is an exploded perspective view, and Figure 3 is a plan view showing the main parts.
4 is a perspective view of the facsimile with a document set therein, and FIG. 5 is a plan view showing a conventional document feeding operation. 2...Paper, 11...Drive roller, 14.15...
Aligning roller, 18.19... Rotation transmission means, 23...
・Paper presser, 24.25...pressure body

Claims (1)

[Scope of Claims] 1. In a paper feeding device that grips and conveys paper by a drive roller connected to a motor and a paper presser, a pair of alignment rollers are arranged coaxially with each other on both sides of the drive roller. A paper feeding device comprising a pressurizing body which is rotatably provided and presses the paper against the alignment roller. 2. The paper feeding device according to claim 1, wherein the pair of alignment rollers are connected by rotation transmission means. 3. The paper feeding device according to claim 1 or 2, wherein the outer diameter of the drive roller is set to be equal to or larger than the outer diameter of the alignment roller.