JPS62153028A - Cut paper sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent misfeeding of cut paper sheets and provide stable transport of the sheets by furnishing a pressing force changing mechanism at a means to press the sheets to a feed roller. CONSTITUTION:A cam 8 is in contact with a pressure adjusting plate 7 in the direction of compressing a spring 4, and thereby cut paper sheets 1 are fed to a sheet feed roller 6 surely one after another. When one of the cut sheets 1a is sent to the sheet feed roller 6 and its leading edge is sense by a sensor 9, the drive motive for a feed roller 5 is shut, but it is rotated by a one-way mechanism with the aid of friction force with the cut sheet 1a transported. Detection signal from said sensor 9 is entered in a motor control part 11. A motor 10 is driven so that the pushing force to the feed roller 5 will be smaller than when rotating under the action of the drive force, and thus the cam 8 is rotated so as to lessen the friction of the feed roller 5 with the cut sheets 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cut paper feeding device used in a recording apparatus such as a copying machine that uses cut paper.

2. Description of the Related Art Conventionally, in reading devices and the like that use cut sheets, cut sheet feeding devices have been used that separate stacked cut sheets one by one and sequentially feed them.

A conventional cut sheet feeding device will be explained below. FIG. 3 is a side view of a conventional cut paper feeder, in which 1 is a cut paper, 2 is a paper cassette that stores the cut paper 1, and 3 is a paper cassette in which the cut paper is placed and is supported by the paper cassette 2. A swingable movable plate 4 is connected at one end to the inner bottom surface of the paper feed cassette 2, and a spring provides elasticity to the movable plate 3. A feed roller 5 separates the cut paper 1 one by one and feeds it out one by one. , 6 are a pair of paper feed rollers that transport the cut paper sent from the feed roller 5 to a recording section of a recording device or the like.

The operation of the cut sheet feeding device configured as described above will be explained below.
is pressed against the feed roller 5 via the movable plate 3. Then, the cut sheets 1 placed in pressure contact with the feed roller 5 are fed one by one to between the pair of feed rollers 6 by the feed roller 5.

At this time, how to separate cut paper 1 one by one (
There are various methods, such as using a separation claw, but their explanation will be omitted here. When one of the cut sheets 1 is sent to the paper feed roller 6, the feed roller 5 stops rotating, but due to the one-way mechanism, while the paper 1a being transported by the paper feed roller 6 is in contact with the force y, the feed roller 5 stops rotating. The feed roller 5 rotates due to the friction between the cut paper lα and the feed roller 5. When the cut sheets 1a are separated from the feed roller 5, the cut sheets 1a are sequentially fed out one by one as necessary, and the same operation as described above is repeated.

Problems to be Solved by the Invention However, in the conventional configuration described above, when paper feeding operations are repeated for a long time, paper dust adheres to the feed roller 5 and the cut paper 1
Since a constant pressing force is always applied by the spring 4, the frictional force between the feed roller 5 and the cut paper 1 becomes small, and as a result, the paper may not be fed or the cut paper that has been fed may be The problem was that the moving speed of No. 1 became unstable.

The present invention solves the above-mentioned conventional problems, and is capable of performing a stable paper feeding operation without paper feeding not being performed or the moving speed of the fed cut paper becoming unstable. The purpose is to provide a paper feeding device.

Means for Solving the Problems To achieve this objective, the cut paper feeding device of the present invention is provided with a variable pressing force mechanism in the means for pressing the cut paper against the feed roller, so as to reduce the friction between the feed roller and the cut paper. It has a configuration in which the pressing force is changed depending on the force.

Effect This configuration increases the frictional force between the cut paper and the feed roller when the feed roller is rotating with driving force, and increases the frictional force between the cut paper and the feed roller when the drive force to rotate the feed roller is cut off. The frictional force between the paper and the feed roller can be reduced.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a side view of a cut sheet feeding device in an embodiment of the present invention. In FIG. 1, 1 is cut paper, 2 is a paper feed cassette, 3 is a movable plate, 4 is a spring, 5 is a feed roller, and 6 is a paper feed roller, which are the same as those in the conventional example. 7 is a pressure adjustment plate whose one end is fixed to the paper feed cassette 2 and the other end is connected to the movable plate 3 via a spring 4; 8 is a cam provided at the bottom of the pressure adjustment plate 70; 9 is a pressure adjustment plate that is connected to the paper feed cassette 2; This is a sensor that detects cut paper that is ejected from between the paper rollers 6.

The operation of the cut sheet feeding device of this embodiment configured as described above will be described below. First, the cut sheets 1 stacked on the movable plate 3 are sent one by one to the paper feed roller 6 by the feed roller 5, as in the conventional example. At this time, in order to reliably feed the cut sheets 1 one by one to the paper feed roller 6, the cam 8
The cam 8 is in contact with the pressure adjustment plate 7 such that the distance from the support shaft to the point of contact with the pressure adjustment plate 7 is large.

As a result, the frictional force between the cut paper 1 and the feed roller 5 increases, and the cut paper can be reliably fed to the paper feed roller 6.

Next, FIG. 2 is an enlarged view of the main parts of this embodiment, where 9 is a sensor that detects cut paper, 10 is a motor that rotates the cam 8, and 11 is a motor that receives a detection signal from the sensor 9. 1
12 is a motor control unit that controls the motor 10 and the spindle 1.
This is a coupling provided at the joint with 3.

Then, when the cut paper 1α is sent to the paper feed roller 6 and the leading edge of the cut paper 1a is detected by the sensor 9, the drive source of the feed roller 5 is cut off, but the cut paper 1α transported by the one-way mechanism is It rotates due to the frictional force between the Further, a detection signal from the sensor 9 is input to the motor control section 11. Then, the pressing force on the feed roller 5 is made smaller than when it is rotating under driving force, that is, the distance from the contact point between the support shaft 13 of the cam 8 and the pressure adjustment plate is made small. , the motor 10 is driven, the cam 8 is rotated, and the friction between the feed roller 5 and the cut paper 1 is reduced.

As described above, when the feed roller 5 is receiving the driving force, the pressing force also applied to the cut paper 1 is increased, increasing the frictional force between the cut paper 1 and the feed roller 5, and the driving force is cut off. When the cant paper 1 is being moved, the pressing force applied to the cant paper 1 can be reduced, and the frictional force between the cut paper 1 and the feed roller 5 can be reduced, so the cut paper 1 can be fed without affecting the transport speed. .

Note that the pressing force on the feed roller 5 also changes depending on the remaining amount of cut paper 1. That is, the smaller the remaining amount of cut paper 1, the smaller the pressing force. In this case, the pressing force applied when the feed roller 5 rotates under the driving force may be set so that the cut sheet 1 can be fed without slipping even when the last sheet of cut sheet 1 is reached.

Effects of the Invention The present invention provides a variable pressing force mechanism in the means for pressing the cut paper against the feed roller, so that the driving force for rotating the feed roller is obtained and the driving force is cut off. This has the excellent effect of being able to vary the pressure force on the feed roller, preventing paper feeding errors, and stably transporting cut paper.

[Brief explanation of drawings]

FIG. 1 is a side view of a cut sheet feeder according to an embodiment of the present invention, FIG. 2 is a perspective view of the main parts of the same embodiment, and FIG. 3 is a side view of a conventional cut sheet feeder. 1...Cut paper, 3...Movable plate, 4...Spring, 5
...Feed roller, 6...Paper feed roller, 7...Pressure adjustment plate, 8...Name of cam agent Patent attorney Toshi Nakao (Male) and 1 other person Bahan 7 l demi power, '1i19 sky [Jchok. Figure 2 Figure 3

Claims (1)

[Claims] A feed roller that separates and sends out stacked cut sheets one by one, a paper feed roller that conveys the cut sheets sent out from this feed roller to a recording device, etc., and a pressure that presses the feed roller through the cut sheets. a detection means for detecting that a cut paper is held between the paper feed rollers; and a pressing force variable means operated by inputting a detection signal from the detection means.