JPH0410633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device in an electronic copying machine.

For example, electronic copying machines that use copy paper cut into predetermined sizes, such as B4 and B5, use paper cassettes to facilitate replacement with copy paper of different sizes. Even when copying one or two sheets of paper of different sizes using such an electronic copying machine, if you change the paper cassette,
It's a hassle. Therefore, some conventional electronic copying machines are capable of copying onto copy sheets of different sizes with a paper cassette loaded.

FIG. 1 shows an example of a paper feeding device in a conventional electronic copying machine. When performing normal copying with this electronic copying machine, a start button (not shown) is pressed. Then feed roller 1
rotates in the direction of the arrow, and the copy paper 3 stored in the paper cassette 2 is sent out. Double feeding of the copy paper 3 is caused by the claw member 4 that presses down both ends of the copy paper 3.
This is prevented by The fed-out copy paper 3 is fed between a register roller 6 and a pinch roller 7 via a paper guide 5, and is temporarily stopped there. register roller 6 at a predetermined timing.
When the copy paper 3 rotates in the direction of the arrow, the copy paper 3 is sent to a recording section (not shown) and copies are made. On the other hand, when copying onto copy paper 8 of a different size with the paper cassette 2 loaded, copy the copy paper 8 into the copy machine main body 9.
It is inserted into the manual insertion port 10 provided in the , and fed between the drive roller 12 and the pinch roller 13 via the chute 11 . At this time, the micro switch 14 is switched by the inserted copy paper 8. When the micro switch 14 is turned on and a predetermined period of time has elapsed, the drive roller 12 begins to rotate in the direction of the arrow. Then, the copy paper 8 is fed between the register roller 6 and the pinch roller 7 via the paper guide 15, and is temporarily stopped there. The following is the same as the normal case described above.

However, in such a paper feeding device, since the drive roller 12 and the like are provided separately from the feed roller 1, the structure is complicated, the number of parts is large, the cost is high, and furthermore, it is difficult to downsize. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a paper feeding device that can be simplified in configuration, reduced in cost, and reduced in size.

In the present invention, a feed roller having a cross section with a part of a circle cut out is used to selectively feed copy paper stored in a paper cassette and manual copy paper, thereby achieving the above-mentioned purpose. achieve.

The present invention will be explained in detail with reference to Examples below.

FIG. 2 shows a paper feeding device in an embodiment of the present invention. In this figure, parts with the same names as those in FIG.

The feed roller 1 of this device includes a roller main body 23 having a cross section cut out from a part of a circle and having a recess 22 adjacent to the cutout 21;
It consists of a rubber belt 24 provided around the outer periphery of this roller body 23. The roller body 23 is made of plastic. The rubber belt 24 is under tension, so that the recess 22 is hollow. When this device is stopped, the feed roller 1 is stopped at the position shown in FIG. That is, since the notch 21 is located at a position facing the copy paper 3 stored in the paper cassette 2, the feed roller 1 is spaced apart from the copy paper 3.
On the other hand, the chute 11 consists of a main chute 25 and a sub-chute 26. The main chute 25 consists of an upper plate and a lower plate, and its tip is located near the recess 22 of the feed roller 1 in a stopped state. Bearings 27 are formed on both sides of the tip of the lower plate of the main chute 25 . As shown in FIG. 3, the sub-shut 26 is rotatably attached to a bearing 27 of the main chute 25 via a shaft 28 formed integrally with plastic. A notch 29 is formed at the tip of the subshoot 26 at a location corresponding to the feed roller 1, and substantially C-shaped bearings 30 are formed on both sides of the notch 29. The bearing 30 has a roller 31
is rotatably attached. A torsion coil spring 32 is attached to the shaft 28. Due to the force of the torsion coil spring 32, the subchutes 26 are biased clockwise in FIG.
is pressed against a rubber belt 24 covering the recess 22 of the feed roller 1 in a stopped state.

When copying on the copy paper 3 stored in the paper cassette 2, a start button (not shown) is pressed. Then, the feed roller 1 starts rotating in the direction of the arrow. At this time, the roller 31 is the feed roller 1.
2, the subshute 26 rotates counterclockwise in FIG. 2 against the force of the torsion coil spring 32, allowing the feed roller 1 to rotate. When the feed roller 1 rotates in the direction of the arrow and the circular arc portion of the rubber belt 24 comes into pressure contact with the copy paper 3, the copy paper 3 is sent out from the paper cassette 2 as shown in FIG. The fed-out copy paper 3 is temporarily stopped by register rollers 6. The feed roller 1 stops after one rotation.

On the other hand, when copying paper 8 of a different size with the paper cassette 2 loaded, insert it into the manual insertion slot 10 and insert it into the main shutter 2.
5 and the sub-shute 26 between the feed roller 1 and the roller 31. At this time, since the concave portion 22 of the feed roller 1 faces the roller 31, the rubber belt 24 in this portion is bent, so that the leading edge of the copy paper 8 is sandwiched between the rubber belt 24 and the roller 31 relatively smoothly. be able to. Also, the micro switch 14 is switched by the copy paper 8 inserted at this time. When the micro switch 14 is turned on and a predetermined period of time has elapsed, the feed roller 1 begins to rotate in the direction of the arrow, and feeding of the copy paper 8 is started.
When the arcuate portion of the rubber belt 24 of the feed roller 1 faces the copy paper 3 stored in the paper cassette 2, the copy paper 8 is being fed between them as shown in FIG. Therefore, the copy paper 3 stored in the paper cassette 2 is not sent out. When the feed roller 1 further rotates in the direction of the arrow, the copy paper 8 is sent out and then temporarily stopped by the register roller 6, as shown in FIG. The feed roller 1 stops after one rotation.

Here, as shown in FIG.
When the arcuate portion of the rubber belt 24 begins to face the copy paper 3 stored in the paper cassette 2, the leading edge of the copy paper 8 is at a distance T from the leading edge of the copy paper 3.
Only located at the rear. Therefore, the copy paper 3 is sent out an additional distance T than the copy paper 8. Therefore, as shown in FIG. 4, the paper guide 5 is designed to absorb the excess amount. In this case, the timing at which the register rollers 6 start rotating can be made the same.
Furthermore, when sending out the copy paper 3, the timing at which the register roller 6 starts rotating may be advanced by an amount corresponding to the distance T.

In the above embodiment, the feed roller 1 has a recess 2.
2 is provided, but this may be omitted. In addition, the feed roller 1 is replaced with a plastic roller body 2.
3 and a rubber belt 24, but the present invention is not limited to this, and the entire body may be made of rubber.

Furthermore, in the embodiment described above, the roller 31 is provided on the sub-shute 26 and is brought into pressure contact with the feed roller 1, but this may be omitted. In this case, the tip of the sub-shute 26 may be curled and this portion may be brought into pressure contact with the feed roller 1.

As explained above, according to the present invention, the feed roller can selectively feed the copy paper stored in the paper cassette and the manually fed copy paper, thereby simplifying the configuration, reducing costs, and reducing the size. can be achieved.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a conventional paper feeding device, FIG. 2 is a front view showing a paper feeding device in an embodiment of the present invention, FIG. 3 is a perspective view of a part of the same device, and FIG. 6 to 6 are diagrams shown to explain the operation of the device. 1...Feed roller, 2...Paper cassette,
3, 8...Copy paper, 10...Manual insertion slot, 1
1... Shoot, 21... Notch, 24... Rubber belt, 25... Main shoot, 26... Sub shoot, 31... Roller.

Claims (1)

[Claims] 1. A feed roller whose cross section is a cutout of a part of a circle and whose arc portion feeds the copy paper stored in the paper cassette, a main chute that feeds the manually fed copy paper to the feed roller, and a rotary motor at the tip of the main chute. It is equipped with a movable sub-shute and a biasing member that presses the sub-shut against the feed roller. When stopped, the feed roller separates from the copy paper stored in the paper cassette due to the action of the notch, and manually feeds the copy paper. A paper feeding device characterized in that when a feed roller is fed, its leading end is fed between a notch of a feed roller and a subshoot.