JPH01317936A - Paper feeding device - Google Patents

Abstract

PURPOSE:To give tensile strength to paper and stabilize its posture and reduce a skew delivery, by setting the transport speed and the transport force of transport rollers which pull out paper sent out from a paper handling means, in an approximately right-angled direction to the direction of this paper sent out, larger than those of the paper handling means. CONSTITUTION:The transport force and the transport speed of a pair of transport rollers 44, 46 are set larger than the force of transport and the speed of transport by means of a paper handling means 42. Accordingly, paper 30, when it is positioned across the paper handling means 42 and both of the transport rollers 44, 46, is given with tensile strength at a space between the two, front and rear, points of the vicinity of the center portion of the paper, and as a result, the posture of the paper 30 can be stabilized. As a result, the skew motion (skew delivery) of the paper 30 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device used in an image recording device such as a printer or a copying machine, and particularly relates to a paper feeding device for use in image recording devices such as printers and copying machines, and particularly for cut paper (recording paper, manuscripts, etc.).
The present invention relates to a device for supplying.

Conventional technology In electrophotographic copying machines, printers, etc., an electrostatic latent image formed on a photoreceptor or dielectric material is developed with toner, and this toner image is transferred onto copy paper or print paper, and then The image is fixed and recorded. As methods for feeding copy paper or print paper, there have been proposed methods that use paper that has been cut into standard sizes in advance, and paper feeding methods that use roll-shaped paper and cut it into desired sizes.

Using roll paper has the advantage of not causing problems such as double feeding, but it requires a lot of space to set multiple sizes of roll paper in a copier or printer. Because of this and the trouble of setting it up, it has recently become common to use paper feeding methods that use cut sheets that have been cut into standard sizes.

The paper feeding device of a copying machine or printer that supplies paper that has been cut into standard sizes in advance stores the paper in cassettes for each size, such as A size and B size, and stores the cassettes in cassettes according to the size to be copied or printed. and exchange method.
A system that allows the size of paper that can be fed on the paper feed tray to be adjusted over a certain width, and in large machines, etc., multiple drawers are provided for each size on the main body, and a relatively large amount of paper is placed in these. There are known methods of storing the

4 and 5 are schematic configuration diagrams of a conventional paper feeding device, and 10 is a paper tray (10) on which a plurality of sheets 12 are stacked (
14 is an endless retard belt wound around a driving roller 16 and a driven roller 18, and 20 is a tart friction roller provided so as to be in pressure contact with the retard belt.

Reference numerals 22 and 22 denote a pair of take-away rollers that press against each other, and the take-away rollers 22 and 22 are provided so as to convey the paper in one direction between the feed direction of the paper 12 by the retard belt 14 and the path. Reference numeral 24 indicates a guide for guiding the conveyance of the paper 12, and reference numeral 26 indicates a transport roller. Each of the transport rollers 26 and 26 has a plurality of rolls integrally attached to each shaft, and the rolls are pressed against each other. It is configured. One shaft of the transport roller 2' 3.26 is rotationally driven by a drive means (not shown) to transport the paper 12 along the paper guide 24.

When the paper 12 is set on the paper tray IO and a paper supply command is issued from a control means (not shown), the drive roller 16 is rotated in the direction of arrow A, the retard belt 14 is rotated, and the retard friction roller 20 is rotated. is rotated in the direction of arrow B, which is opposite to the direction in which the paper travels, and feeding of the paper 12 is started.

Here, focusing on the top layer paper 12a that is in contact with the retard belt 14, the feed force received from the retard belt 14 is greater than the reverse force received from the retard friction roller 20, so the top layer paper 12a
2a will be conveyed in the paper advancing direction (direction of arrow C). For other sheets, the retard friction roller 20 receives more force than the feed force received from the retard belt 14.
Since the reverse force received from the retard belt 14 and the retard friction roller 20 is larger, the sheets cannot pass through the pressure contact between the retard belt 14 and the retard friction roller 20, so that the sheets are fed one by one.

Hereinafter, the portion composed of the retard belt 14, the retard friction roller 20, etc. will be referred to as paper handling means. The main function of the paper handling means is to separate the paper 12 and send it out one sheet at a time, and since load torque is applied to the paper 12 while it is being sent out by the tart friction roller 20, the sending force of the paper I2 is weak and , the stability of the posture of the paper 12 is poor, and the paper 12 may be skewed (diagonally fed). For this reason, a pair of takeaway rollers 22.22 are provided on the downstream side of the paper handling means to supplement the feeding force of the paper 12, reduce diagonal feeding of the paper 12, etc., and pass the paper 12 to the transport rollers 26.26. That's what I do.

In a general image recording device using such a paper feeding device, from the viewpoint of miniaturizing the device, the paper tray etc. are installed at the bottom of the device, and the image recording processing section is installed above the paper tray etc. in many cases. Therefore, as can be seen from FIG. 4 and FIG. The direction of the data is changed and the data is sent to the recording processing section.

Problems to be Solved by the Invention As described above, in the past, a takeaway roller was provided downstream of the paper handling means to send the paper in the same direction as the paper handling means, and then the paper was delivered to the transport roller. For this reason, as shown in FIG.
There was a problem in that it could not be made smaller than L2 (take-away roller part) + L3 (transport roller part), and the demand for miniaturization of the device could not be met.

The present invention has been made in view of these points, and an object of the present invention is to provide a paper feeding device that has a simple configuration and can be miniaturized.

Means for Solving the Problems Figures 1 and 2 are detailed explanatory diagrams of the present invention.
The figure is a side view, and FIG. 2 is a plan view.

An endless belt 38 is wound around two rollers 34 and 36, and a roller 40 having approximately the same width as the belt 38 is installed near the center of the paper sending end of the paper stacking means 32 that stacks the paper 30. Paper handling means 42 pressed against the belt 38
is provided, and the sheets 30 are separated and sent out one by one due to differences in frictional force between the belt 38 and the paper 30, and between the roller 40 pressed against the belt 38 and the paper 30.

A pair of transport rollers 44, 46 having substantially the same width as the belt 38 and in pressure contact with each other are provided so as to send the paper 30 in a direction (in the direction of arrow E) that is approximately perpendicular to the paper sending direction (direction of the arrow) of the paper handling means 42. . This transport roller 44.461; [The relative position of the paper 30 and the paper handling means 42 in the width direction of the paper 30 with respect to the paper 3G! ! (
It is provided at approximately the same position as dimensions F and G (see Figure 2).

The transport speed of the paper 30 by the transport rollers 44 and 46 is set higher than that of the paper handling means 42, and
The conveyance force can be applied to, for example, a bearing means 48 rotatably attached to the shaft 44a of the transport roller 14, and an outer ring of the bearing means 48 formed in a housing or the like.
It is made larger than the paper handling means 42 by bringing it into contact with the paper handling means 42 and increasing its nip pressure. 52 is a paper guide.

According to the present invention, a pair of transport rollers are provided that are in pressure contact with each other so as to convey the paper in a direction substantially perpendicular to the direction in which the paper is separated and sent out by the paper opening means. The transport force and transport speed of the port roller are greater than those of the paper handling means, and the port roller is located near the center of the paper like the paper handling means. When the paper is positioned across both sides, tension is applied to the paper between the front and rear points near the center of the paper, thereby stabilizing the posture of the paper.

In addition, the takeaway roller that was conventionally provided downstream of the paper handling means can be omitted, and the paper is conveyed by the transport rollers by changing its traveling direction by approximately 90° immediately after the paper handling means. , it becomes possible to downsize the image recording apparatus by the length of the dimension L2 in FIG.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 3 is a partial sectional view of an image recording apparatus using a paper feeding device to which the present invention is applied. Reference numeral 60 denotes a paper tray (including a cassette, etc.) on which a plurality of sheets 62 are stacked.

Reference numeral 64 indicates a drive roller that is rotationally driven in the direction of arrow H by a drive means (not shown), and 66 indicates a rotatably supported driven roller. A retard belt 68 is wound around the retard belt 68. On the lower surface of the retard belt 68 is a tart friction roller 7 which is driven to rotate in the direction of the arrow (■) by a drive means (not shown) and has the same width as the retard belt 68.
0 are pressed together at a predetermined pressure.

The retard belt 68, the retard friction roller 70, and the like constitute a paper handling means 72.

The lower surface of the retard belt 68 of the paper handling means 72 is adapted to come into pressure contact with the vicinity of the center of the paper 62 placed on the paper tray 60.

Reference numerals 74 and 76 designate a pair of transport rollers that are in contact with each other. One transport roller 74 is rotationally driven by a drive means (not shown), and the other transport roller 76 is rotatably supported on a shaft 76a.

The transport roller 74.76 has a width of approximately 40-5
0 mm, and the vicinity of the center in the width direction of the paper contacts the transport rollers 74 and 76 to transport the paper.

Both ends of each shaft of the transport rollers 74, 76 are biased by biasing means (not shown) so that the transport rollers 74, 76 are pressed against each other with a predetermined pressure. The conveyance force and conveyance speed of the transport rollers 74 and 76 are set to be greater than that of the paper handling means 72.

Furthermore, a rotatable bearing means 78 is attached to a shaft 76a near both ends of the transport roller 76, and the outer ring of the bearing means 78 is in contact with a receiving portion 82 formed on a housing 80. As a result, the deflection of the shaft 76a is suppressed, and the transport rollers 74, 76 are strongly nipped, so that the conveying force thereof is not reduced.

A paper guide 84 guides the paper in a predetermined direction.

A plurality of paper feed devices configured in this manner are provided at the bottom of the image recording device for each paper size.

When the paper 62 is set on the paper tray 60 and a paper supply command is issued from a control means (not shown), the drive roller 64 is rotated in the upward direction of the arrow, the retard belt 68 is rotated, and the retard friction roller 70 is rotated. is rotated in the direction of the arrow (■) opposite to the direction in which the paper travels, and feeding of the paper 62 is started.

Here, focusing on the top layer paper 62a that is in contact with the retard belt 68, the feed force received from the retard belt 68 is greater than the reverse force received from the retard friction roller 70.
2a is conveyed in the paper advancing direction (direction of arrow J). For other sheets, the retard friction roller 70
Since the reverse force received from the retard belt 68 and the retard friction roller 70 is greater, the retard belt 68 and the retard friction roller 70 are not able to pass through the pressure contact portion, so that the sheets are fed one by one.

The paper 62 that has been handled by the paper handling means 72, which includes the retard belt 68, the retard friction roller 70, etc., is guided by a paper guide 84, and is guided in a direction perpendicular to the paper feeding direction (direction of arrow J) by the paper handling means 72. Transport roller 74 provided to send paper
．． 76, the transport roller 74.7
It is sent further by rotation 6 and is supplied to the recording processing section.

According to the configuration of this embodiment, the paper handling means 72 separates the paper into one
The main function is to separate sheets one by one, and the back torque from the retard friction roller is acting, so the paper 6
Although there are some drawbacks regarding the feeding power and the stability of the posture of the sheet 62, the transport roller 74.7
6, the transport rollers 74 and 76 have a higher transport speed and transport force than the paper handling means 72, so the paper 62 is pulled out from the paper handling means 72, and the paper 62 at this time is The tension applied stabilizes the posture of the paper 62.

Also, a transport roller 74 is provided to transport the paper 62 vertically upward from the paper handling means 72 .
Since the paper 64 can be passed directly to the paper 76, the configuration becomes simple and the device can be made smaller.

Effects of the Invention As described in detail above, the present invention uses a transport roller having a higher conveyance speed and conveying force than the paper handling means to move the paper sent out from the paper handling means in a direction substantially perpendicular to the sending direction by the paper handling means. Because it is configured to be pulled out, tension is applied to the paper, the posture of the paper is stable, there is less skew (diagonal feeding), and the configuration is simple! =, which has the effect of contributing to downsizing of the image recording apparatus.

[Brief explanation of the drawing]

FIG. 1 is a side view for explaining the principle structure of the present invention, FIG. 2 is a plan view, and FIG. 3 is a partial sectional view of an image recording apparatus using a paper feeding device to which the present invention is applied. , FIG. 4 and FIG. 5 are diagrams for explaining the configuration of the prior art. 30...Paper, 32...Paper loading means, 38...Belt, 40...Roller, 42...Paper handling means, 44.46...Transport roller. Fuji Xerox Co., Ltd.

Claims (1)

[Claims] An endless belt is wound around two rollers near the center of the paper sending end of a paper stacking means for stacking papers,
In a paper feeding device, a paper handling means is provided in which a roller having approximately the same width as the belt is pressed against the belt, and the paper handling means separates the sheets and sends them out one sheet at a time. A pair of transport rollers having substantially the same width as the belt and in pressure contact with each other is provided so as to feed the paper in a direction substantially perpendicular to the paper feeding direction, and the transport rollers are positioned so that the relative position with respect to the paper is between the paper and the paper handling roller. A paper feeding device characterized in that it is provided so as to be substantially the same relative position in the width direction of the paper with the means, and its conveyance force and conveyance speed are set to be greater than those of the paper handling means.