JP2758524B2 - Automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic paper feeder capable of separating sheets one by one and supplying them to a printing section in a printer or a copying machine and returning the sheets after printing.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2 , a separation piece 20 formed of an elastic material is pressed against a paper feed roller 22 by a leaf spring 21 to reduce the frictional force between the paper feed roller 22 and the paper. Set it to the relatively large value within the predetermined range,
The frictional force between the separation piece 21 and the paper is set to the next largest value, the frictional force between the papers is set to the smallest value, and the paper is driven left, for example, in a counterclockwise direction to move the paper to the left. When a plurality of sheets are sandwiched between the paper feed roller 22 and the separating piece 20 when the paper is supplied to the sheet feeding section, the progress of the uppermost sheet is stopped by the separating piece 20, and the overlapping sheets are slipped. There is an automatic paper feeder that forcibly feeds only the paper that comes into contact with the paper feed roller 22 to separate and feed the paper one by one.

As shown in FIG. 3 , a belt 3 is wound around a plurality of rollers 1 and 2, and a shaft 4 and a separation roller 5 in contact with the belt 3 are connected via a torque limiter 6. A belt 11 is wound around a pulley 7 fixed to one end, a pulley 8 fixed to an end of the shaft 4, and a driving pulley 10 driven by a forward / reverse rotatable motor 9. Is set to a relatively largest value within a predetermined range, the frictional force between the separation roller 5 and the sheet is set to the next largest value, and the frictional force between the sheets is set to the smallest value.
When the motor 9 is rotated forward in the direction of arrow A to convey the paper in the forward direction, the rotation of the motor 9 in the forward direction is controlled by the torque limiter 6.
When a plurality of sheets are sandwiched between the belt 3 and the separation roller 5, the upper layer sheet is sequentially moved rightward by the separation roller 5 rotating counterclockwise. Push back, forcibly send out only the paper that comes into contact with the belt 3 to the left. If there is only one paper between the belt 3 and the separation roller 5, the torque limiter 6 is slipped to be forced by the belt 3. There is an automatic paper feeder in which the separation roller 5 is rotated following the frictional force with the paper to be fed.

[0004]

In the [0006] printer or a copying machine or the like, there is a use mode to retract the paper feeds the printing section after printing, automatic paper feed method shown in FIG. 2, passes through the paper feed roller 22 When the returned paper is returned, the edge of the paper in the return direction may catch on the separation piece 20 and may not be returned.

In the apparatus shown in FIG. 3 , when the motor 9 is rotated in the forward direction of the arrow A, the paper is, for example, approximately 200 mm / mm.
The sheet is fed in the forward direction at the speed of s, and the sheet is returned in the reverse direction by rotating the motor 9 in the direction of arrow B. When the sheet is returned at a high speed, for example, 900 mm / s, the torque limiter 6 The presence increases the load. As a result, the paper returned from the printing unit at a high speed stagnates between the belt 3 and the separation roller 5, and a jam is likely to occur.

[0006]

[0007]

SUMMARY OF THE INVENTION The present invention provides a rotatable paper transporter connected to a forward / reverse rotatable motor, a rotatable separating roller contacting the paper transporter, and a rotation of the motor. To the separation roller, and a one-way clutch for transmitting only the forward rotation of the motor for transporting the paper in the forward direction to the separation roller.

[0008]

[0009]

According to the present invention, when the motor is rotated forward to convey the paper in the forward direction, the forward rotation of the motor can be transmitted to the separation roller via the torque limiter and the one-way clutch. Accordingly, when the sheets overlap at the contact portion between the sheet conveying body and the separation roller, the sheet on the separation roller side can be pushed back by the rotating separation roller, thereby promoting the sheet separation action. . Further, when the motor is reversed, the one-way clutch can maintain the power between the motor and the separation roller in a power cutoff state. Therefore, it is possible to avoid applying a load of the torque limiter to the motor, and to prevent the motor from rotating. The separation roller can be freely rotated by the frictional force with the returned paper to return the paper at a high speed, thereby preventing the occurrence of a jam.

[0010]

[0011]

[0012]

[0013]

[0014]

An example of the embodiment of the present invention will be described with reference to FIG. The same parts as those described with reference to FIG.
Used. A belt 3 is wound around a plurality of rollers 1 and 2
You. At the end of the roller 1 and the flat line shaft 4, a pulley 8 is provided with one-way clutch 13 is incorporated.
Further, the shaft 4, the separation roller 5 that is in contact with the belt 3, a torque limiter 6 for transmitting the rotational force of the shaft 4 to the separation roller 5 is mounted. The power transmission direction of the one-way clutch 13 is determined so that when the motor 9 is normally rotated in the direction of arrow A, the rotational force is transmitted to the separation roller 5.

In such a configuration, when the motor 9 is rotated forward in the direction of arrow A to rotate the belt 3 and convey the paper in the forward direction, the rotation of the motor 9 in the forward direction is controlled by the torque limiter 6 and the one-way clutch 13. Separation roller 5 through
Can be transmitted to That is, the separation roller 5 rotates counterclockwise. Thus, when the sheets overlap at the contact portion between the belt 3 and the separation roller 5, the sheet on the separation roller 5 side can be pushed back by the separation roller 5 rotating counterclockwise. Thereby, the sheet separating operation can be promoted.

When the motor 9 is rotated in the direction of arrow B, the one-way clutch 13 can maintain the power between the motor 9 and the separation roller 5 in a power cutoff state. 6, the separation roller 5 can be freely rotated by the frictional force with the paper returned by the belt 3 to return the paper at a high speed, and therefore, the occurrence of a jam can be prevented. .

[0017]

[0018]

According to the present invention, a rotatable sheet carrier which is connected to the forward and reverse rotatable motor, and a rotatable separation roller is contacted to the sheet conveying member, the separating roller rotation of the motor And a one-way clutch that transmits only the forward rotation of the motor for transporting the paper in the forward direction to the separation roller, so that the motor is rotated forward to transport the paper in the forward direction. Occasionally, the forward rotation of the motor can be transmitted to the separation roller via the torque limiter and the one-way clutch, so that when the sheets overlap at the contact portion between the sheet conveyance body and the separation roller, the separation can be performed. The paper on the roller side can be pushed back by the rotating separation roller,
When the motor is rotated in the reverse direction, the one-way clutch can maintain the power between the motor and the separation roller in a power cutoff state. It is possible to avoid applying a load, rotate the separation roller freely by the frictional force with the paper returned by the paper transport body and return the paper at high speed, and thus prevent the occurrence of a jam. Has an effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a conventional example.

FIG. 3 is a perspective view showing another conventional example.

[Explanation of symbols]

 3 Paper transporter 5 Separation roller 6 Torque limiter 9 Motor 13 One-way clutch

Claims (1)

(57) [Claims] 1. A rotatable paper transporter connected to a forward / reverse rotatable motor, a rotatable separation roller in contact with the paper transporter, and a torque for transmitting rotation of the motor to the separation roller. An automatic paper feeder comprising: a limiter; and a one-way clutch for transmitting only a forward rotation of the motor for transporting a sheet in a forward direction to the separation roller.