JPH03172239A - Paper feeder - Google Patents

Abstract

PURPOSE:To make it possible to realize three conditions of non-contact, weak contact and strong contact of a paper feed means in relation to paper by a simplified structure by providing an electromagnet in the paper feed means or a paper feeder main unit. CONSTITUTION:When a command of paper refeed is generated, an electromagnetic solenoid 21 is energized, and a movement impeding member 20 is retracted to the output end 22 of the electromagnetic solenoid 21. An electromagnet 25 is energized by a microcomputer 26, in a direction opposite to the case of non- contact, and a permanent magnet 27, provided in a supporting member 15, is attracted by the electromagnet 25. Consequently, the paper feed roller 17 of the supporting member 15 strongly presses paper form (strong contact condition) to come down to a position of two-dot chain line and to deliver the paper form P. In the case of providing the electromagnet 25 above the permanent magnet 27, a non-contact condition is obtained when the electromagnet 25 and the permanent magnet 27 attract each other and a strong contact condition is obtained when the magnets repulse each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device used in an image forming apparatus such as a copying machine.

[Prior Art] Conventionally, among the paper feeding devices used in image forming apparatuses, the paper feeding device for double-sided copying is, for example, the Japanese Patent Application Laid-Open No. 1983-1999.
One disclosed in Japanese Patent No. 86328 is known.

To put this more concretely, when the paper for single-sided copying is placed on the intermediate tray between the time when one side of the paper is copied and the other side is copied, the paper is rotated onto the intermediate tray. A freely movable paper feed roller and the like stock paper while relatively weakly pressing the paper with its own weight. If you want to adjust the width of the paper placed on intermediate tray L,
Keep the paper feed roller inactive (no contact between paper and paper feed roller). Also, when feeding paper from the intermediate tray, strongly press the paper feed roller. It is possible to take these three states.

[Problem M to be Solved by the Invention] However, in the above-mentioned conventional technology, in order to maintain the paper feed roller in two types of states, ie, a non-operating state and a state in which the paper is strongly pressed, one solenoid is required for each. The problem was that the structure had to be complicated.

Therefore, the present invention as claimed in claim 1 has been made in view of the above problems of the conventional paper feeding device, and has a simple structure, and moreover, the paper feeding roller is in a non-contact state, a weak contact state, and a weak contact state with the paper. It is an object of the present invention to provide a paper feeding device that can take three states including a strong contact state.

An object of the present invention as set forth in claim 2 is to provide a paper feeding device which has a simple structure and can take two states, a weak contact state and a strong contact state.

[Means for Solving Problem-1] The present invention as claimed in claim 1 provides a paper feeding means that feeds paper in three states: a non-contact state, a weak contact state due to its own weight, and a strong state. an electromagnet provided in the paper feeding device or the paper feeding device main body; a control device for controlling the TL flow of the electromagnet; and a control device provided in the paper feeding device main body or the paper feeding device. The present invention according to claim 2 is characterized in that the present invention is provided with a paper feeding means that takes two states, a weak contact state and a strong contact state with respect to the paper, and supplies the paper. The apparatus includes: an electromagnet provided on the paper feeder body or the paper feeder body; a control means for controlling a current of the electromagnet; and a magnetic body provided on the paper feeder body or the paper feeder body. It is characterized by:

[Function] The present invention as claimed in claim 1 is such that the electromagnet is provided in the paper feeder or the paper feeder main body, and the permanent magnet is provided in the paper feeder main body or the paper feeder. There are three methods: non-contact state, weak contact state due to own weight, and strong contact state.
The state can be easily changed by the control means.

Further, in the present invention as claimed in claim 2, the electromagnet is provided in the paper feeding device or the main body of the paper feeding device, and the magnetic body is provided in the main body of the paper feeding device or the paper feeding device, so that the paper feeding device is not connected to the paper. Two states, a weak contact state and a strong contact state, can be easily achieved by the control means.

[Examples] The present invention will be described below with reference to drawings showing examples thereof.

FIG. 1 is a schematic sectional view showing an embodiment of a paper feeding device according to the present invention.

In FIG. 1, a first paper transport path 1 and a second paper transport path 2 are shown as part of an image forming unit V2 equipped with a paper feed device. A paper cassette 3 and a feed roller 4 rotated in the direction indicated by arrow A are arranged on the upstream side (right side in the figure) of the first paper transport path l. When the feed roller 4 is rotated in the direction of the arrow A, the uppermost sheet of the stacked sheets P in the paper cassette 3 is sent out from the paper cassette 3 by the action of the feed roller 4 . The paper P sent out from the paper cassette 3 passes through the guide plate 5 and is transported to the transport a-ra pair 6.7. From then on, the photoreceptor 10
0 etc., one side of the paper is copied, and in the case of normal copying, it is ejected as is. On the other hand, in the case of composite copying,
The paper is not ejected, but is sent downward, and is sent to the second paper transport path 2 as shown by arrow l in the figure. That is, the second paper conveyance path 2
is connected from the downstream side of the first paper conveyance path 1 to the upstream side (from the left to the right in the figure) of the first paper conveyance path 1 passing below it, and a paper feeding device 80 is disposed in the middle thereof.

Guide plates 9 and 10 and transport rollers 11 and 12 are disposed downstream of the paper feeding device 80 with respect to the paper transport direction. Therefore, the paper sent out by the paper feeder @80 passes between the guide plates 9 and 10, and then passes through the pair of transport rollers 11.1.
2, and further passes between the guide plates 13 and 14 to the above-mentioned 1st
The paper is transported to the upstream side of the paper transport path 1. Copying is then performed on paper P again.

Next, the paper feeding device 80 will be explained in detail based on FIG.

First, the paper feeding means 8 includes a support member 15 that swings around a support shaft 16, and a support member 15 that is rotated tR in the paper conveyance direction.
It has a paper feed roller 17 that rotates around a rotating shaft 18 on the side, and a permanent magnet 27 that is attached to the support member 15 below the rotating shaft 18.

Historically, the paper feeding device main body 80 includes a radius alignment member 19 that adjusts the width of the paper P, and a movable upper member 2 that prevents the paper from moving.
0, a pair of conveyance path rollers 23 and 24, an electromagnet 25 provided below the permanent magnet 27, and a control means 26 for controlling the electromagnet 25. still,
As the control means 26, a microcomputer in the main body of the apparatus is used. Furthermore, the position of the electromagnet 25 is the same as that of the permanent magnet 2.
Of course, it does not matter if it is located on the -h side of the permanent magnet 27 instead of below the permanent magnet 27. Further, the permanent magnet 27 may be placed inside the rotating shaft 18 by =9.

Next, the operation of the paper feeding device will be explained.

First, when a single-sided copy paper P is sent from the upstream side of the second paper transport path 2, it passes through the paper feed roller 17, and the leading edge of the paper P comes to the movement prevention member 20 and stops. At this time, the control means 26 does not apply current to the electromagnet 25. As a result, the paper feed roller 17 comes into weak contact with the paper P due to its own weight.

Next, adjust the width of the paper P. That is, current is applied to the electromagnet 25 by the microcomputer 26, the permanent magnet 27 of the support member 15 and the electromagnet 25 repel each other, and the paper feed roller 17 is brought out of contact with the paper P. Then, the width of the paper P is adjusted by the width alignment member 19.

Next, when there is a command to refeed the paper, the electromagnetic solenoid 21 is energized and the movement blocking member 20 is moved back to the output end 22 of the electromagnetic solenoid 21. Then, the microcomputer 26 biases the electromagnet 25 in the opposite direction to that in the non-contact case.
Since the electromagnet 25 attracts the permanent magnet 27 provided on the support member 15, the paper feed roller 17 strongly presses the paper (in a strong contact state), comes down to the position indicated by the two-dot chain line in the figure, and feeds the paper. Further, when the electromagnet 25 is provided on the L side of the permanent magnet 27, if the electromagnet 25 and the permanent magnet 27 are attracted, they will be in a non-contact state, and if they are repelled, they will be in a strong contact state.

Of the pair of rollers 23 and 24 on the downstream side of the movement blocking member 20 in the paper transport direction, the upper roller 23 is rotated in the paper P transport direction as shown by the arrow. The roller 24 located on the lower side is rotated in a direction opposite to the conveying direction of the paper P as shown by the arrow, and acts as a separation roller that prevents two sheets from being fed.

FIG. 2 is a simplified sectional view of another embodiment in which, contrary to FIG. 1, an electromagnet 25 is provided on the support member 15 side, and a permanent magnet 27 is provided below facing the electromagnet 25.

When there is weak contact with the normal paper P, the electromagnet 25
Don't play F. When in strong contact with the paper P, current is passed through the electromagnet 25, and the electromagnet 25 and permanent magnet 27 are attracted to each other. Furthermore, when the paper P is not in contact with the paper P, a current is passed in the opposite direction to that when the paper P is attracted, and the electromagnet 25 and the permanent magnet 27 repel each other.

In addition, the attraction and repulsion between the electromagnet 25 and the permanent magnet 27 are caused by the electromagnet 2.
In addition to reversing the current flowing through the electromagnet 25, two types of coils may be wound around the electromagnet 25, one in the forward direction and the other in the reverse direction, and attraction and repulsion may be performed by selecting one of these coils.

Next, as a second invention, a case where a magnetic material and an electromagnet are combined without using a permanent magnet will be described with reference to FIGS. 3 and 4.

In FIG. 3, one end of the rotating shaft 18 has a subrocket)4.
1 is fixed, and a sprocket 41 is drivingly connected via a chain 42 to a sprocket portion 44a of a transmission member 44 fixed to one end of a support shaft 43.
Since it has a structure similar to the sprocket part of No. 4, the drive source (
The driving force from the tongue (shown in the figure) is transmitted by the chain 45, the transmission member 44,
Rotating shaft 18 via chain 42 and sprocket 41
This is transmitted to the paper feed roller 17.17 attached to the paper feed roller 17.17, and the paper feed roller 17.17 is rotated in the direction shown by arrow B.

The paper feed roller 17.17 has a magnetic body 50 inside, and an electromagnet 25 provided below the paper feed roller 17.17 is turned ON-OFF under the control of a microcomputer 26 as a control means. , paper feed roller 17.1
7, when the electromagnet 25 is ON, the paper is strongly pressed (strong contact state) to re-feed the paper, and when the electromagnet 25 is OFF, the paper is weakly pressed by the weight of the paper feed roller 17.17 (weak contact state) . Note that the magnetic material 50 is made of iron or other materials. Further, the magnetic body 50 may be provided within the rotating shaft I8.

Next, in FIG. 4, an electromagnet 25 is provided on the paper feed roller 17 side, contrary to FIG.
FIG. 3 is a simplified cross-sectional view when 0 is provided.

4, the only difference from FIG. 1 is the electromagnet 25, the microcomputer 26 that controls the electromagnet 25, and the magnetic body 50, and the rest of the configuration is the same as in FIG. 1. When there is a command to refeed the paper, the microcomputer 26 controls the electromagnet 25 to pass current, thereby causing the electromagnet 2
5 and the magnetic body 50 are attracted to each other, and the paper feed roller 17 strongly presses the paper and feeds the paper. Furthermore, when there is no command to refeed the paper, the microcombi 1-26 controls the electromagnet 25 so that no current flows, and the paper feed roller 17 only weakly presses the paper with its own weight.

In this embodiment, the case of composite copying has been described, but the present invention may of course be applied to other copying modes.

[Effects of the Invention] In the present invention as claimed in claim 1, since the electromagnet is provided in the paper feeding device or the main body of the paper feeding device, and the permanent magnet is provided in the main body of the paper feeding device or the paper feeding device, it is possible to feed the paper. The paper means can realize three states, a non-contact state, a weak contact state, and a strong contact state, with a simple structure.

Further, in the present invention as claimed in claim 2, the electromagnet is provided in the paper feeding device or the main body of the paper feeding device, and the magnetic body is provided in the main body of the paper feeding device or the paper feeding device, so that the paper feeding device is not connected to the paper. Two states, a weak contact state and a strong contact state, can be realized with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the paper feeding device according to the present invention, FIG. 2 is a sectional view showing another embodiment of the paper feeding device, and FIG. 3 is a sectional view showing another embodiment of the paper feeding device. FIG. 4 is a perspective view showing an embodiment of the paper feeding device according to claim 2, and FIG. 4 is a sectional view showing another embodiment of the paper feeding device. 8... Paper feeding means 25... Electromagnet 26... Microcomputer (control means) 27...
・Permanent magnet 50...Magnetic body 80...Paper feeding device

Claims (2)

[Claims] (1) In a paper feeding device equipped with a paper feeding means that feeds paper in three states: a non-contact state, a weak contact state due to its own weight, and a strong contact state, the paper feeding device or the A paper feeding device comprising: an electromagnet provided in a paper device main body; a control means for controlling a current of the electromagnet; and a permanent magnet provided in the paper feeding device main body or the paper feeding device. (2) Two types of weak contact and strong contact with paper
In the paper feeding apparatus, the paper feeding apparatus is provided with a paper feeding means for supplying the paper, an electromagnet provided in the paper feeding means or the main body of the paper feeding apparatus, a control means for controlling the current of the electromagnet, and a control means for controlling the current of the electromagnet. A paper feeding device comprising: a paper device main body or a magnetic body provided on the paper feeding means.