JPH01214543A - Paper feeding device for copying machine and the like - Google Patents

Abstract

PURPOSE:To make the whole size of a paper feeding device compact so as to get rid of dispersion in sending out paper form, and to make it possible to damp vibration on a friction roll, and to prevent abnormality from generating by making it so as to push up a friction roll to a paper feeding roll side along channels in a holder. CONSTITUTION:A friction roll 10 is energized to upward via push up arms 14a, 14b and a spring 17 and abutted on energized to a paper feeding roll 1. Next, when a paper feeding assistant roll 9 and the roll 1 are driven, forms 5 are sent out to a copying portion, the roll 10 is checked on rotation with abutment of wirl-stop members 19a, 19b to stoppers 22a, 22b and the forms 5 are handled by one after one. Again, a stopper arm 21 on which stoppers 22a, 22b are fixed is turnable to right and left direction therefore right and left portions of the roll 10 are freely movable to up and down direction, so the nip between the roll 10 and the paper feeding roll 1 always becomes uniform in axial direction and thereby skewing on the form 5 and partial wear on the roll can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for printing a large number of stacked sheets of paper in a copying machine or the like.
This is a paper feeding device that separates sheets one by one from above and feeds them to a transfer unit, etc. In particular, paper is separated by pressing a friction roll (separation roll) that does not rotate in the feeding direction against the paper feeding roll that rotates in the feeding direction. The present invention relates to a paper feeding device that performs the following operations.

[Conventional technology]

The above-mentioned conventional paper feeding device has a structure as shown in FIG. 6, in which a friction roll 2 that contacts the lower side of a paper feeding roll 1 is rotated at least in the feeding direction of the paper 5 to a holder 4 via a support 3. Furthermore, the holder 4 is fixed to the paper feed section main body 7 so as to be able to freely rotate up and down about the fulcrum 6, and the friction roll 2 is always fed with a constant force by an elastic body such as a spring 8. The configuration was such that it was tilted upward so as to come into pressure contact with the roll 1. In the figure, reference numeral 9 indicates a paper feed auxiliary roll, and the paper feed auxiliary roll and the paper feed roll are adapted to be rotationally driven in the feeding direction of the paper 5.

[Problem to be solved by the invention]

The conventional paper feeding device described above has the following problems.

(1) By holding the holder 4 on a rotational fulcrum, it is possible to easily release abnormal loads such as when paper enters the paper in the handling section.On the other hand, since it is easy to rotate around the fulcrum, vibration is reduced This vibration is a cause of abnormalities, and sufficient anti-vibration measures are required for the friction roll fixing part, the fulcrum of the holder, etc.

(2) The fulcrum of the holder 4 is placed upstream of the center of the friction roll 2 in the paper feeding direction, and in order to keep the nip point between the friction roll 2 and the paper feed roll 1 constant, Therefore, not only does the paper feed device become larger, but also the distance between the paper feed auxiliary roll 9 and the paper feed roll 1 becomes larger, resulting in variations in paper feeding. becomes larger.

(3) In order to equalize the axial nip between the friction roll 2 and the paper feed roll 1, the holder 4 must be supported at a single fulcrum and configured to be rotatable in a direction that allows the axes to be parallel to each other. First, its structure was complicated.

[Means and effects for solving the problems] The present invention has been made in consideration of the above-mentioned problems, and it is possible to make the entire paper feeding device compact, eliminate variations in paper feeding, and The vibration of the friction roll is attenuated, eliminating the occurrence of abnormalities caused by vibration of the friction roll.Furthermore, with a simple configuration, any misalignment in the axial direction of each part of the paper feed can be absorbed, ensuring that the nip between the rolls is always maintained. The purpose of this paper is to provide a paper feeding device for a copying machine, etc., which is capable of uniformly distributing the paper. In a paper machine, shaft parts on both sides of a friction roll are slidably fitted into grooves of a holder that holds the roll, and are urged by an elastic body in the pressing direction, and both sides of the friction roll -3= A stopper in which a detent member protruding from the upstream side in the paper feeding direction is fixed to the side shaft, and both stoppers that come into contact with both detent members are supported by a holder so as to be rotatable in the axial direction of the friction roll. The friction roll is fixed to both ends of the arm, and the friction roll is urged by an elastic body and comes into contact with the paper feed roll, and the rotation preventing member comes into contact with the stopper, thereby preventing rotation in the feeding direction. . Further, the stopper rotates in the axial direction of the friction roll, so that the nip between the friction roll and the paper feed roll is always uniform.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 5. In this embodiment, the same members as those in the conventional example shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted.

A shaft 10a protrudes from both sides of the friction roll 1° in the left-right direction (axial direction) and contacts the lower side of the paper feed roll 1.

Bearings 11a and llb are fitted to each of the paper feed section 10b, and these bearings 11a and llb are fitted into grooves of left and right support pieces 13a and 13b of the holder 13 fixed to the paper feed section main body 7, and are rotated in the vertical direction. It is slidably supported. 14a, 1
Reference numeral 4b denotes left and right push-up arms, and these push-up arms 14a and 14b are located below the respective bearings 1F-a and llb, and are supported by the support pieces 13a and 13b so as to be rotatable in the vertical direction. . These left and right push-up arms 14
a, 14b are integrally connected on the left and right by a connecting member 15, and this connecting member 15 and a spring force adjustment link 16 provided on the holder 13 side are connected by a spring 17, and the biasing force of this spring 17 Push up arm 14a.

14b is biased in a direction to move the bearings 14a and llb upward. The spring force adjustment link 16 is rotatable in the direction of expansion and contraction of the spring 17 and is supported by an adjustment screw 18.

Detent members 19a and 19b are integrally fixed to the respective tips of the left and right shafts 10a and 10b of the friction roll 10. These anti-rotation members 19a, 19b are the shaft 10a,
It has a slope 20 that protrudes gradually lower than 10b toward the upstream side in the paper feeding direction. 21 is a stopper arm with arm parts provided in the left and right direction, and this stopper arm 2]
The anti-rotation members 19a, 19 are attached to the tips of both arm portions of the
Stoppers 22a, 2 facing the respective slopes 20 of
2b is fixed.

The stopper arm 2] is supported by the holder 3 at approximately the center in the left-right direction so as to be rotatable in the left-right direction.

In the above configuration, the friction roll 10 has left and right bearings 11a.
, llb, the push-up arms 14a, 14 abut against the lower side of the
b. It is biased upward via the spring 17 and is urged into contact with the paper feed roll 1. At this time, the left and right rotation prevention members 19a.

The slope of 19b is in contact with stoppers 22a and 22b (FIG. 4).

By driving the paper feed supplementary roll 9 and the paper feed roll 1 in the above state, the paper 5 is sent to the transfer section. At this time, the friction roll 10 is prevented from rotating due to the contact between the rotation prevention portions +J' 19a and 19b and the stoppers 22a and 22b.
The sheets of paper 5 are handled one by one by this non-rotating friction roll 10. Also at this time, the stopper 22a.

Since the stopper arm 21 to which 22b is fixed is rotatable in the left and right directions, the left and right parts of the friction roll coat 0 can also be freely moved in the vertical direction, and the nip between the friction roll 10 and the paper feed roll 1 is always maintained. It becomes uniform in the axial direction, and the paper 5
This prevents skew and uneven roll wear.

Furthermore, if an abnormal load is applied to the nip between the friction roll 10 and the paper feed roll 1 when the paper enters, the friction roll 10
can move in response to this abnormal load and easily relieve it.

This is because when the paper feed roll 1 rotates, a clockwise rotational moment is generated on the friction roll 10 using the stoppers 22a and 22b as fulcrums (Figs. 1 and 4), and if an abnormal load occurs, this This is because the rotational moment increases, overcomes the pushing force of the spring 17, moves the friction roll 10 downward, and prevents the friction between the paper feed roll 1 and the friction roll 10 from becoming excessive.

Further, the left and right parts of the friction roll 10 are provided with bearings 11a.

11b and the grooves of the support pieces 13a and 13b of the holder 13, the friction roll 10 is moved by this sliding resistance.
The vibrations generated in

Furthermore, by rotating the stopper arm 21 left and right, the positions of the stopper pins 22a and 22b, which determine the left and right positions of the friction roll 1o, also change according to changes in the nip between the friction roll 10 and the paper feed roll 1. (Figure 5)
However, the nip between the side rolls 1 and 10 is always uniform.

〔Effect of the invention〕

According to the present invention, the friction roll 1 is moved along the groove of the holder 13.
0 to the paper feed roll 1 side, the holder 13 that supports the friction roll 1o becomes smaller,
Furthermore, the distance between the paper feeding auxiliary roll 9 and the paper feeding auxiliary roll 9 can be made small, making it possible to make the entire paper feeding device compact, and at the same time, it is possible to eliminate variations in paper feeding.

In addition, the shaft portions at both left and right ends of the friction roll 10 and the holder 13
The vibration of the friction roll 10 is attenuated by the sliding resistance between the friction roll 10 and the groove, and abnormalities caused by the vibration of the friction roll 10 can be eliminated. Furthermore, since the stopper pins for stopping the rotation of the friction roll 10 are integrally rotatable in the left and right directions, the friction roll 10 can also be freely rotated in the left and right directions. With this configuration, it is possible to absorb any misalignment in the axial direction of each part of the paper feed, and it is possible to always make the nip between the rolls uniform.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
2 is a front view, FIG. 2 is a view taken in the direction of the ■ arrow in FIG. 1, FIG. 3 is a plan view, FIGS. 4 and 5 are action explanatory views, and FIG. 6 is a front view of a conventional example. 1 is a paper feed roll, 5 is paper, 10 is a friction roll, K, O
a and 10b are shafts, 13 is a holder, and 19a. 19b is a rotation stopper, 21 is a stopper arm, 22a
, 22b is a stopper. = 11 −

Claims (1)

[Claims] In a paper feed device such as a copying machine that separates paper 5 by pressing a friction roll 10 against a paper feed roll 1, the shaft portions on both sides of the friction roll 10 are slidably slidable into grooves of a holder 13 that holds the friction roll 10. While fitting together, the shafts 10a and 10b on both sides of the friction roll 10 are biased by an elastic body in the pressing direction.
The anti-rotation members 19a, 19b protruding from the upstream side in the feeding direction of the paper 5 are fixed to the anti-rotation members 19a, 19b.
A paper feeding device for a copying machine or the like, characterized in that both stoppers 22a and 22b that abut against the friction roll 19b are fixed to both ends of a stopper arm 21 which is rotatable in the axial direction of a friction roll 10 and supported by a holder 13.