JPH0466435A - Paper feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention provides a method for separating sheets of paper set in a stacked state one by one in, for example, facsimile machines, copying machines, optical reading devices, etc. The present invention relates to a paper feeding device that sequentially feeds paper to a predetermined paper feeding location.

(Prior Art) As shown in FIG. 4, this type of paper feeding device conventionally has a paper feeding roller 2 disposed at the lower front end of a paper tray 1 on which a plurality of sheets of paper are set in a stacked state. A pad member 4 having a rubber pad 3 that comes into contact with the paper feed roller 2 is disposed above the paper tray 1.
A leaf spring-like spring 5 is provided to press the rubber pad 3 against the paper feed roller 2.

Then, when the paper feed roller 2 is driven to rotate with a plurality of sheets of paper P set in a stacked state on the paper tray 1,
The paper P is drawn in by the frictional force of the rubber material fitted to the outer periphery of the paper feed roller 2 and the pressing force of the spring 5 that presses the paper P against the paper feed roller 2 via the pad member 4, and the pad member 4 The paper feed roller 2 is
The upper layer of paper P that has contacted the paper P is pressed by the rubber pad 3, and the paper P that has contacted the paper feed roller 2 is released and sent out.

(Problem to be Solved by the Invention) In the conventional paper feeding device, a plurality of stacked sheets of paper P are drawn between the paper feeding roller 2 and the pad member 4 by the rotation of the paper feeding roller 2, and the pad member 4 The sheets are separated and sent out one by one by a rubber pad 3, and the stacked thickness of the sheets P drawn between the sheet feed roller 2 and the pad member 4 presses the sheets P against the sheet feed roller 2. The pressing force of the spring 5 changes, especially when the stacking thickness of the paper P changes at the time when one sheet of paper P has been fed out, the pressing force of the spring 5 changes, which affects the separating action of the paper P. Therefore, paper feeding failures such as multiple sheets of paper P being fed at the same time or not being fed easily occur.

Further, the rubber pad 3 of the pad member 4 is pressed against the paper P and locks the upper layer of the paper P fed out by the paper feed roller 2, so the rubber pad 3 of the pad member 4 securely locks the paper P. To do this, the pad member 4 must be pressed against the paper feed roller 2 with a strong pressing force (several 1.00 g). Therefore, the resistance for separating and feeding out the paper P is very large (and the motor that rotates the paper feed roller 2 needs to be large enough to handle the load, and the larger the motor, the louder the operating noise will be. , rubber pad 3
There are also problems such as the sound of the paper P rubbing against the paper P, which increases the noise.Furthermore, a large tensile force is applied to the paper P, causing the paper P to elongate.

Further, since the pad member 4 and the spring 5, which have a complicated structure made up of multiple parts, are used, there are problems in that the cost is high and the paper feeding device becomes large.

The present invention has been made in view of these points, and it is possible to reliably separate and feed sheets one by one, reduce the driving load on the paper feed roller, downsize the motor, and reduce noise. reduce the amount of tensile force exerted on the paper, and
It is an object of the present invention to provide a paper feeding device that can reduce costs and achieve miniaturization.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a paper feeding device that separates and sequentially feeds a plurality of sheets of paper set in a stacked state one by one. a guide member having an inclined guide surface that guides the paper onto the paper feed roller; and a leading end portion of the paper that is inclined at an acute angle along a tangential direction of the paper feed roller and is guided onto the paper feed roller by the guide member. A sheet of paper is provided with an inclined contact surface that locks the paper in a contact state and guides the paper toward the surface of the paper feed roller, and a sheet that contacts the paper feed roller at the end of the inclined contact surface that is close to the paper feed roller. The paper is equipped with a pad that is integrally provided with a separation section that allows only the sheets of paper to be sent out.

(Function) In the present invention, when a plurality of stacked sheets of paper are set on the guide member, the paper passes through the inclined guide of the guide member and is guided onto the paper feed roller, and the paper guided by the guide member The leading end of the pad comes into contact with the inclined contact surface of the pad and is engaged, and is guided to the surface of the paper feed roller by the inclined contact surface.

When the paper feed roller is driven to rotate, the bottom sheet of paper that is in contact with the paper feed roller is moved to the paper feed roller by the frictional force of the paper feed roller and the inclined contact surface of the guide member and pad. Due to the guided action, the paper is drawn in from below the separation section of the pad, separated from the paper above, and sent out.

At this time, the only force applied to the paper is its own weight, so the frictional force between the lowest layer of paper drawn in by the paper feed roller and the paper in the upper layer is small, and only the bottom layer of paper is drawn in by the paper feed roller. The upper layer of paper is held in a locked state by contacting the inclined contact surface of the pad, and the paper is reliably separated and sent out one by one.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 2 shows a facsimile machine 12 to which the paper feeder 11 of the present invention is applied, in which a plurality of sheets of manuscript paper P for transmission are sent to the paper feeder 1.
Set to 1. Then, the sheets P set in the paper feeder 11 are separated and sent out one by one from the paper feeder 11 to a conveyance path 14 formed between the guide plates 13 inside the machine. The image sensor 15 is pressed against the image sensor 15 by a pressure roller 16 and read.
Further, a plurality of discharge rollers 17 are provided from the end of the conveyance path 14.
It is designed to be ejected outside the aircraft.

As shown in FIG. 1, the paper feeding device 11 has a guide member 21 on which a plurality of sheets of paper P are placed in a stacked state, and this guide member 21 has an angle θ1 that allows the paper P to slide under its own weight. Slanted guide surface 2 tilted forward at (more than 30°)
11 is provided, and the paper P is guided forward by this inclined guide 211.

A rotating shaft 22 rotatably driven by a motor (not shown) is disposed at the lower front end of the guide member 21, and a paper feed roller 24 made of a rubber material with a large coefficient of friction is fixed to this rotating shaft 22.

A guide plate 26 is arranged almost vertically in front of the paper feed roller 24 with a paper feed gap 25 between the paper feed roller 24 and the guide plate 26.
The lower part of the conveyance path 14 is in communication with the inlet [-1 section.

Further, a pad 27 is disposed above the paper feed roller 24, and this pad 27 has a mounting piece 28 fixed to the guide plate 26, etc., and a mounting piece 28 (from the NI piece 28 to the paper feed roller 24). An inclined guide piece 29 is formed integrally with an elastic plate spring material and is bent at an acute angle along the tangential direction of the guide member 21. The inclined contact surface 30 abuts and locks the leading end of the paper P guided to the paper feed roller 24 by the paper feed roller 24. An angle 0 that can be guided toward the surface of
2 is set. Further, at the intersection of the lower end of the inclined guide piece 29 and the support piece 31 bent downward from the mounting piece 28 toward the center of the paper feed roller 24, a paper feed roller 24 is provided.
A separation section 32 is integrally provided that allows feeding out only one sheet of paper P that comes into contact with the paper feed roller 24. A gap is provided, and the gap is kept constant by the support piece portion 31.

Next, the operation of this embodiment will be explained.

When a plurality of stacked sheets of paper P are inserted along the guide member 21-F, the paper P is placed on the inclined guide surface 2 of the guide member 21.
11 on the guide member 21 and guided onto the paper feed roller 24. Further, the leading end of the paper P guided onto the paper feed roller 24 is held in contact with the inclined contact surface 30 of the tZ/rod 27, and the inclination of the inclined contact surface 30 causes the paper feed roller 24 to guided to the top. At this time, the inclination of the inclined guide piece 29 of the pad 27 changes depending on the laminated thickness of the sheets P. That is, the thicker the sheet P is, the larger the angle θ2 becomes.

Then, when the paper feed roller 24 is rotationally driven, the lowest layer of paper P in contact with the paper feed roller 24 is moved by the frictional force of the paper feed roller 24 and the guide member 21 and the pad 27.
Due to the action of being guided to the paper feed roller 24 by the inclined contact surface 30 of the pad 27, the pad 27 is drawn forward from the lower side of the separating section 32 and separated from the upper layer paper P, and the paper feed roller 24 and guide plate 26 are separated from each other. When the paper P enters the paper delivery gap 25 between the two, a transport force is obtained and the paper P is sent out to the transport path 14.

At this time, since the only force applied to the paper P is its own weight, the frictional force between the lowest layer of paper P drawn in by the paper feed roller 24 and the upper layer of paper P is small; P
Since the pad 27 is held in a locked state by being in contact with the inclined contact surface 30 of the pad 27, paper feeding failures such as multiple feeding of multiple sheets of paper P or not being fed are prevented from occurring.

Even if the paper P is sent out one by one by the paper feed roller 24, the paper P set on the guide member 21 is guided to the paper feed roller 24 by the guide member 21 and the pad 27, and is reliably fed out to the last sheet. It will be done.

As described above, a plurality of sheets of paper P placed in a stacked state on the guide member 21 is guided to the paper feed roller 24 by the heat of the inclined guide surface 21 of the guide member 21, and the paper guided by the guide member 21 is The tip of the paper P can be locked by the inclined contact surface 30 of the pad 27 and guided to the surface of the paper feed roller 24 by the inclination of the inclined contact surface 30. Since no pressing force is applied to the paper feed roller 24, it is possible to prevent paper feeding failures as described above, and the drive load on the paper feed roller 24 is small, making the motor that rotates the paper feed roller 24 smaller. It is also possible to downsize the motor and reduce the size of rubber parts and paper P.
Low noise can be achieved by eliminating friction points between the
No large tensile force is applied to the paper P, and elongation of the paper P can be prevented.

〔Effect of the invention〕

According to the present invention, a plurality of sheets of paper stacked on the guide member are guided onto the paper feed roller by the inclined guide surface of the guide member, and the leading edge of the paper guided by the guide member is padded. In other words, the paper is guided to the paper feed roller by its own weight, and no pressing force is applied to the paper by a spring or the like, so the stacking of the paper is prevented. It is possible to reliably separate and feed sheets one by one without being affected by changes in thickness, etc., and it is possible to prevent paper feeding failures from occurring.

In addition, since there is no need to press the paper against the paper feed roller with a spring, etc., the load to drive the paper feed roller can be reduced and the motor can be made smaller, making the motor more compact and eliminating friction points between the rubber member and the paper. As a result, noise can be reduced, no large tensile force is applied to the paper, and elongation of the paper can be prevented. Moreover, the structure is simple, and costs can be reduced and miniaturization can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the paper feeding device of the present invention, FIG. 2 is a cross-sectional view of a facsimile machine to which the paper feeding device of the present invention is applied, FIG. 3 is a perspective view of a pad, and FIG. FIG. 2 is a cross-sectional view of a conventional paper feeding device. DESCRIPTION OF SYMBOLS 11...Paper feed device, 21...Guide member, 2+1・Inclination guide surface, 24...Paper feed roller, 27...Pad, 30
... Inclined contact surface, 32... Separation section, P... Paper. 2'?

Claims (1)

[Claims] (1) A paper feed device that separates and sequentially feeds multiple sheets of paper set in a stacked state one by one, which includes a paper feed roller that feeds out the paper, and a paper feed roller that feeds out the paper, and guides the paper that is set with the paper onto the paper feed roller. A guide member having an inclined guide surface is inclined at an acute angle along a tangential direction of the paper feed roller, and the leading end of the paper guided onto the paper feed roller by the guide member is locked in abutting state and the paper is fed. A separation section that is provided with an inclined contact surface that leads toward the surface of the paper roller, and that is capable of sending out only one sheet of paper that contacts the paper feed roller at an end of the inclined contact surface that is close to the paper feed roller. A paper feeding device comprising: a pad integrally provided with a pad;