JPH02209332A - Paper feeder - Google Patents

Abstract

PURPOSE:To change a surface position of a handling roller contacting with a feed belt as well as to eliminate a sheet of paper sandwiched between rollers by using a reversible turning motor for a motor driving the feed belt, and installing a one-way clutch in space between the handling roller and a fixed shaft. CONSTITUTION:A handling roller 4 is engaged with a fixed shaft 10 with some play, and each ratchet 11, whose tip is energized by a spring in its opening direction, installed in this fixed shaft is engaged with a ratchet internal gear 4a on an inner surface of the handling roller 4. When a surface contacting with a feed belt 3 of the handling roller 4 is changed, if a reversible turning motor 8 is reversed, the feed belt 3 is liable to rotate the handling roller 4 in reverse to the feeding direction. Since engagement between the ratchet 11 and the ratchet internal gear 4a cannot stop the reverse rotation against the feeding direction of the handling roller 4, this roller 4 rotates in reverse to the feeding direction. When rotation of the feed belt 3 is stopped in the state that paper is sandwiched between the feed belt 3 and the handling roller 4, reverse rotation is performed for a proper time so that the paper can be discharged to the side of a tray.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feeding device used in a copying machine, etc., and in particular, the present invention relates to a paper feeding device used in a copying machine, etc. The present invention relates to a paper feeding device that prevents paper from being fed out.

[Conventional technology]

Even in the paper feeding device as described above, the means for rotating the separation roller is an essential mechanism because it is necessary to change the position of the surface of the separation roller in contact with the feed belt at regular intervals. The means for rotating the sorting roller may include a means for rotating the sorting roller in increments by the action of attaching/detaching a cassette or raising/lowering a tray, or a means similar to a means for rotating the sorting roller in a paper feeder in which the sorting roller is rotated in the opposite direction to paper feeding. A method using a motor is known. Although these conventional means merely rotate the separating roller by a certain rotation angle, they have a problem in that the mechanism is complicated and takes up a lot of space. That is, in the former method, a swinging lever that moves under the action of the cassette or tray, a ratchet pawl holding member that reciprocates with the swinging lever, and a ratchet wheel that is moved by the ratchet pawl must be provided on the outside of the sorting roller. In the latter method, if a motor for driving the feed belt is used, a branch transmission system including a connecting/disconnecting clutch must be installed, and if a motor exclusively for the sorting roller is used, at least that motor must be installed outside the sorting roller. It won't happen.

[Problem to be solved by the invention]

The present invention provides a simple and space-saving rotating means for changing the surface position of the normally stationary sorting roller in contact with the feed belt, and the rotating means is placed between the stopped feed belt and the sorting roller. The purpose of this invention is to provide a paper feeding device that can also be used to remove trapped paper.

[Means to solve the problem]

The present invention provides a paper feeding device that feeds paper by preventing double feeding by contact between a rotating feed belt and a stationary separating roller, and uses a forward and reverse rotating motor as the motor that drives the feeding belt, and the separating roller The paper feeding device is characterized in that a one-way clutch is used between the roller and its fixed shaft, and the separation roller is rotated by the frictional force of the feed belt rotated in reverse by the motor. achieve.

[Function] That is, in the paper feeding device of the present invention, as a means for changing the position of the surface of the separating roller in contact with the feeding belt, the drive motor of the feeding belt is a forward/reverse rotation motor, and the separating roller and its fixed shaft are rotated. By installing a one-way clutch in between, which is a simple method that does not take up much space, by rotating the forward/reverse motor in the opposite direction, the position of the surface of the sorting roller in contact with the feed belt can be changed, and the If paper is caught between the feed belt and the sorting roller, the paper can be removed by appropriately increasing the amount of reverse rotation of the forward/reverse rotation motor.

〔Example〕

The present invention will be explained below using illustrated examples.

FIG. 1 is a schematic side view showing an example of a paper feeding device of the present invention, and FIG. 2 is a perspective view of the main parts.

In the paper feeding device shown in FIG. 1, a tray l is raised by a known elevating means (not shown) and the upper surface of the paper P stacked on the tray l is brought into pressure contact with a delivery roller 2. The uppermost paper P in contact is fed between the contact between the feeding belt 3 rotating in the direction of the arrow and the stationary sorting roller 4 by rotating clockwise by a known rotating means, The feeding belt 3 applies a feeding action to the upper surface of the fed paper P, and the handling roller 4 gives a feeding blocking effect to the lower surface of the fed paper P, so that the stacked papers P on the tray l are separated one by one from the top. It can be sent without double feeding.

The rotation of the feed belt 3 wound around the driving roller 5 and the driven roller 6 in the direction of the arrow is as shown in detail in FIG.
This is performed by rotating the drive roller 5 in the direction of the arrow by the forward/reverse rotating motor 8 via the speed reducer 9. The sorting roller 4 in contact with the feed belt 3 is connected to a fixed shaft IO
The ratchet pawl 11, which is provided on the fixed shaft IO and whose tip end is spring-biased in the opening direction, is engaged with the ratchet internal gear 4a carved on the inner surface of the sorting roller 4. Even when the feed belt 3 rotates in the direction of the arrow, it remains stationary as it is locked by the ratchet pawl 11. Note that the free roller 7 that is in contact with the upper part of the feed belt 3 is used to adjust the tension of the feed belt 3 and the contact pressure against the sorting roller 4 and the like.

When rotating the separating roller 4 to change the surface of the separating roller 4 that is in contact with the feed belt 3, the forward/reverse rotating motor 8 may be reversed to rotate the feeding belt 3 in the opposite direction to the feeding direction. . That is, the feed belt 3 rotating in the opposite direction to the feed direction attempts to rotate the separating roller 4 in the opposite direction to the feed direction by frictional force, causing the ratchet pawl 11 and the ratchet internal gear 4 to rotate in the opposite direction to the feed direction.
Since the locking a is such that the rotation of the separating roller 4 in the opposite direction to the feeding direction cannot be stopped due to the orientation of the ratchet teeth, the separating roller 4 rotates in the opposite direction to the feeding direction.

If the rotation of the feed belt 3 stops while the paper P is caught between the feed belt 3 and the sorting roller 4 due to a jam, etc., the paper P can be removed by performing the above-mentioned reversal for an appropriate long period of time. It is possible to eject the paper P that is currently on the tray to the tray 1 side. In that case, it is best to lower the tray 1 or raise the feed roller 2 to separate the paper P on the tray l from the feed roller 2 so that the paper P can be easily ejected. Needless to say.

The paper feeding device of the present invention is not limited to the illustrated example, and may be one in which a cassette is attached and removed, and a feeding roller is omitted, and the paper is brought into contact with a feeding belt and fed to a contact point between the feeding belt and the sorting roller. But that's fine. In addition, even if free rollers and reducers are omitted, other types of one-way clutches are used, such as those consisting of ratchet face gears axially pressed against each other by a spring. But it goes without saying that it's a good thing.

〔Effect of the invention〕

The paper feeding device of the present invention has a simple rotating means for changing the position of the surface of the normally stationary sorting roller that contacts the feed belt, and does not take up much space. Therefore, it is possible to reduce the cost and downsize of copying machines, etc. Moreover, when the feed belt stops with the paper being pinched between the feed belt and the sorting roller, the paper pinched can be easily discharged by the rotating means of the sorting belt, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing one example of the paper feeding device of the present invention, and FIG.
The figure is a perspective view of essential parts. ■...Tray 2...Feeding roller 3...
...Feed belt 4a...Ratchet internal gear 5...Drive roller 8...Forward/reverse rotation motor 11...Ratchet pawl

Claims (1)

[Claims] In a paper feeding device that feeds paper by preventing double feeding by contact between a rotating feed belt and a stationary sorting roller, a forward/reverse rotating motor is used as the motor that drives the feed belt, and the separating roller and its fixed shaft are connected to each other. 1. A paper feeding device characterized in that a one-way clutch is used between the rotations to apply rotation to the sorting roller by the frictional force of a feed belt reversely rotated by the motor.