JPH0121056B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic paper feeder for automatically feeding documents to be sent to a facsimile machine.

In general, this type of automatic paper feeder can be roughly divided into two types:
There are two methods. One is a take-up method in which the originals stacked on the document stacking table are fed one by one from the top layer of paper, and the other is a trade-in method in which the documents stacked on the document stacking table are fed one by one from the bottom layer of paper. It is a method.
Among these, the top-up automatic paper feeder can be set on the document loading table with the document surface facing upward, so it has the advantage of giving the operator a sense of security, but the part that requires adjustment is on the bottom. Because it is in
The disadvantage is that adjustment is difficult.

In other words, in a system that separates and feeds a large number of documents to be sent one by one using a combination of a feeding roller and a reversing roller with a torque limiter, the feeding roller is placed on top and the reversing roller is placed on the bottom. In order to prevent the transmitted original from being deflected during paper feeding, there are difficulties in workability in keeping the feeding roller and reversing roller in contact with each other while maintaining a highly accurate parallel state, and in adjusting the torque limiter. It was hot.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide an automatic paper feeder of a top-up type that can increase the number of non-adjustable portions and improve the efficiency of adjustment work.

The present invention provides a paper feeding roller provided on a drive shaft, a reversing roller opposing the paper feeding roller from below, and a reversing roller provided on the axis of the reversing roller, which only requires a driving force of a predetermined value or less to the reversing roller. a driving force transmitting means for transmitting a driving force; By providing a pair of wall plates having elongated holes formed such that the angle between the wall plate and the axis of the transmission means forms an obtuse angle, and a biasing means for biasing the wall plate upward, it is possible to achieve a non-adjustable system. This allows the reverse rotation roller to be set as it is.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic front view of an automatic paper feeder which is an embodiment of the present invention, and FIG. 2 is a schematic side view of FIG. 1. In FIG. 1 and FIG. 2, the same members are given the same reference numerals. In FIGS. 1 and 2, 1 is a feeding roller that feeds the original to be sent;
Reference numeral 2 denotes a drive shaft of the feeding roller 1, which is directly driven to rotate and is supported by a fixed wall plate (not shown). Note that the feeding roller 1 is fixed to a drive shaft 2.

3 is a reversing roller, and 4 is a rotating shaft of the reversing roller 3. Reference numerals 5a and 5b are transmission rollers that are provided at both ends of the rotating shaft 4 and transmit driving force. 6
and 9 are stoppers, and 8a and 8b are friction plates whose sides are made of high-friction material. Note that the reversing roller 3, coil spring 7, and friction plates 8a, 8b are slidably engaged with the rotating shaft 4, and constitute a torque limiter. Further, the coil spring 7 moves the friction plate 8a along the arrow B
Pressing in the direction.

15a and 15b are movable wall plates, and this wall plate 1
5a, 15b are provided with elongated holes 16a shown in FIG.
(An equivalent elongated hole 16b is also provided in the case.) Rotating axis 4
are long holes 16a, 16b in wall plates 15a, 15b.
It is installed through the.

13 is located below the rotating shaft 4, wall plates 15a,
It is a drive shaft that passes through 15b and is supported by an external wall plate (not shown), and transmission rollers 14a and 14b are fixed to both ends. Said long holes 16a, 16
b is the drive shaft 13 in the wall plates 15a, 15b.
extending in the direction.

11a and 1b are short axes;
Long holes 16a, 16 in wall plates 15a, 15b 11b
b is penetrated, and stoppers 12a, 12b are provided on the outside.
However, transmission rollers 10a and 10b are provided on the outside, respectively. The transmission rollers 10a, 10b are
It is rotatably provided with respect to the shafts 11a and 11b,
The shafts 11a and 11b can freely move in the direction of extension of the elongated hole, but do not rotate. 17 is a document loading table; 18a is a coil spring, one end of which is connected to the wall plate 15a, and the other end of which is connected to an external casing (not shown)
The wall plate 15a is urged in the direction of the arrow C. The wall plate 15b is also biased in the direction of arrow C by a coil spring 18b (not shown). These springs 18a and 18b provide contact pressure between the feeding roller and the reversing roller.

The operation of the automatic paper feeder having the above configuration will be described below. First, the rotation of the drive shaft 2 causes the feeding roller 1 to rotate in the direction of arrow _Y1 . At the same time, the drive shaft 13 rotates, and the transmission rollers 14a, 14b move along the arrow lines.
Y Rotates in _two directions.

On the other hand, transmission rollers 10a, 10b and 5a, 5
The rotating shafts 11a, 11b, and 4 of b move in the direction of arrow D, which is the extension direction of the elongated hole, due to their own weight. Therefore, the transmission rollers 10a, 10b are in contact with the transmission rollers 14a, 14b, and the transmission rollers 5
a, 5b come into contact with transmission rollers 10a, 10b. As a result, the transmission rollers 10a, 1
0b rotates in _{the three} directions of arrow Y, and transfer rollers 5a,
5b rotates in _{the four} directions of arrow Y.

Then, the rotating shaft 4 rotates in the direction of the arrow _Y4 , and this rotational force is applied to the stoppers 6, 9 and the friction plates 8a, 8.
It is transmitted to the reversing roller via b.

Here, the friction plates 8a, 8b and the coil spring 7 constitute a torque limiter. That is, when the torque applied to the reversing roller 3 is small, the frictional force generated by the friction plates 8a and 8b prevails, and the reversing roller 3 rotates in the direction of arrow _Y4 , causing the reversing roller 3 to rotate in the reverse direction. Conversely, when the torque applied to the reversing roller 3 is large, the friction plates 8a,
The friction force generated by 8b is lost, and the friction plates 8a,
8b rotates idly, and the reversing roller 3 does not rotate reversely.

Generally, the torque limiter is adjusted by adjusting the pressing force of the coil spring 7, but when the feeding roller 1 is in contact with the reversing roller 3 either directly or through one document to be sent, , the reversing roller 3 is rotated by the feeding roller 1 in the direction opposite to the arrow _Y4 direction, and the feeding roller 1 and the reversing roller 3
The torque limiter is set so that the reversing roller 3 rotates in the direction of the arrow _Y4 when the two or more documents are in contact with each other through two or more original documents. The coil springs 18a and 18b are used to bring the feeding roller 1 and the reversing roller 3 into contact with each other with appropriate pressure.

In this manner, also in this embodiment, it is possible to automatically separate and feed a plurality of transmission originals stacked on the original stacking table 17 one by one starting from the topmost layer of paper.

Now, in this embodiment, as described above, the drive shaft 1
3 to the rotating shaft 4 is transmitted through transmission rollers 14a, 14b, 10a, 10b and 5a, 5b.
Since the diameter of the roller can generally be made with high precision, the drive shaft 13 and the rotation shaft 4 can be set parallel to each other with high precision without any adjustment. Furthermore, since it is easy to set the drive shaft 2 and the rotary shaft 4, both of which are supported by an external wall plate (not shown), in parallel with high precision, the drive shaft 2 and the rotary shaft 4 can also be set with high precision without adjustment. This means that it can be set parallel to . Therefore, the feeding roller 1 and the reversing roller 3 can also be brought into contact with each other in parallel with high precision without any adjustment. No adjustment work is required.

Also, for the same reason, the distance between the drive shaft 2 and the rotation shaft 4 can be set with high precision, so you can
The reversing roller 3 can be brought into contact with the feeding roller 1 at an optimal location.

As is clear from the above description, the present invention includes a paper feeding roller provided on a drive shaft, a reversing roller opposing the paper feeding roller from below, and a reversing roller provided on the axis of the reversing roller. a driving force transmitting means for transmitting only a driving force of a predetermined value or less to the reversing roller; and a shaft of the reversing roller and a shaft of the transmitting means transmitting the driving force to the shaft are supported with the shaft of the reversing roller facing upward. a pair of wall plates having elongated holes formed such that an angle between the drive shaft, the axis of the reversing roller, and the axis of the transmission means forms an obtuse angle; and a biasing means for biasing the wall plates upward. Since the reversing roller of the automatic paper feeder can be set without adjustment, the adjustment work time is shortened and work efficiency is improved.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of an automatic paper feeder according to an embodiment of the present invention, and FIG. 2 is a schematic left side view thereof. DESCRIPTION OF SYMBOLS 1... Feeding roller, 2, 13... Drive shaft, 3... Reverse rotation roller, 4... Rotating shaft, 5a, 5b, 10a, 10
b, 14a, 14b...Transmission roller, 6, 9...Stopper, 7, 18a, 18b...Coil spring, 8
a, 8b...Friction plate, 15a...Movable wall plate, 16a...
Long hole, 17... Original loading table.

Claims (1)

[Claims] 1 A paper feed roller 1 provided on a drive shaft 2, and a reversing roller 3 facing the paper feed roller 1 from below.
and driving force transmitting means 6, 7, 8a, 8b, 9 provided on the shaft 4 of the reversing roller 3 and transmitting only a driving force of a predetermined value or less to the reversing roller 3;
The shaft 4 and a transmission means 1 for transmitting driving force to the shaft 4
0a with the shaft 11a facing upward, and has an elongated hole 16a formed so that the angle between the drive shaft 2, the shaft 4, and the shaft 11a forms an obtuse angle.
An automatic paper feeder comprising a pair of wall plates 15a and a biasing means 18a for swinging and biasing the wall plates 15a upward about a shaft 13.