JPH0733192B2 - Paper feeder - Google Patents

Description

The present invention relates to a sheet feeding device used in an image forming apparatus such as a copying machine or a laser printer.

<Prior Art> Conventionally, this type of sheet feeding device has a first actuator for cassette sheet feeding detection arranged in the cassette side sheet feeding path and a first actuator for manual sheet feeding detection arranged in the manual side feeding path. It was equipped with two actuators, an interlocking arm that interlocks both actuators, and a paper detection switch for both cassette feeding and manual paper feeding to detect paper feeding by the swing of each actuator and start copying operation. .

<Problems to be Solved by the Invention> In the above-described conventional technique, the paper can be inserted from the manual feed side during paper feeding from the cassette side only by the interlocking of the cassette paper feed side actuator and the manual paper feed side actuator. It was possible.

Therefore, if paper is inserted from the manual feed side during cassette feeding, it may cause double feed or JAM from both the cassette feeding side and the manual feeding side.

SUMMARY OF THE INVENTION In view of the above, the present invention locks the manual feed side actuator with a simple mechanism for cassette feeding and the like to perform double feeding of paper and JAM.
The purpose is to prevent.

<Means for Solving the Problem> The problem solving means according to the present invention is, as shown in FIGS. 1, 2 and 3, a cassette side sheet feeding path 6 for feeding a sheet 3 from a sheet feeding cassette 5 to a conveying path 4, A manual paper feed path 8 for feeding the paper 3 from the manual paper feed section 7 to the transport path 4, and a cassette paper feed having one end located on the transport path 4 and swingably arranged around the first shaft 21. The first actuator 22 for detection and the manual feed side paper feed path 8
A second actuator 24 for manually feeding paper feed, one end of which is located swingably around the second shaft 23, and an interlocking arm 25 for interlockingly connecting the first actuator 22 and the second actuator 24. , A paper detection switch 29 for both cassette paper feeding and manual paper feeding for detecting paper feeding by swinging the first actuator 22 to start copying operation,
The other side of the interlocking arm 25 is rotatably connected to the other end of the second actuator 24 via a pin 28, and the other end of the first actuator 22 is engaged with one side of the interlocking arm 25. (2) The first actuator 22 is configured to swing in conjunction with the movement of the interlocking arm 25 accompanying the swing of the actuator 24, and the first actuator 22 when the paper 3 is fed from the paper feed cassette 5 is moved. Actuator 22
Of the interlocking arm 25 to rotate the one side of the interlocking arm 25 around the pin 28 by swinging the interlocking arm 25, and the second actuator 24 by blocking movement of the other side of the interlocking arm 25. Stop means for locking the rotated interlocking arm 25 in order to stop the swinging of the.

<Operation> In the above problem solving means, when paper is fed from the manual paper feed section 7, the second actuator 24 is pushed and swings around the second shaft 23. Then, the interlocking arm 25 is pulled toward the manual feed side, and in conjunction with this, the first actuator 22 swings to turn on the paper detection switch 29.

In this case, since the switch 29 is turned on without pressing the copy button, the control section in the copying machine body determines that the sheet is fed from the manual feed side, and starts the copy operation.

Next, when the copy button is pressed and the paper is fed from the paper feed cassette 5, when the paper 3 is conveyed from the cassette side, the first actuator 22 is pressed. Along with this, interlocking arm 25
Rotates around the pin 28 and is stopped by being locked by the stop means. At this time, even if an attempt is made to insert the paper 3 from the manual feed side, the movement of the interlocking arm 25 is blocked by the stop means,
The second actuator 24 is in a locked state and the paper 3 cannot be inserted.

That is, when the paper is fed from the cassette side, the paper cannot be inserted from the manual feed side.

As described above, when the cassette feed side actuator is operating, the manual feed side actuator is locked so that paper cannot be inserted from the manual feed side. Therefore, the cassette side feed path 6 and the manual feed side are Double feeding from both of the paper paths 8 can be prevented, and the occurrence of JAM and the like can also be prevented.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a sheet feeding device of a copying machine according to the present invention, showing a state in which sheets are not fed from either the cassette sheet feeding side or the manual feeding side, and FIG. 2 is the same from the manual feeding side. FIG. 3 is a diagram showing a state in which the sheet is fed, and FIG. 3 is a diagram showing a state in which the sheet is fed from the cassette side by pressing the copy button.

As shown in the drawing, the sheet feeding device of the copying machine according to the present invention feeds the sheet 3 from the sheet feeding cassette 5 to the transfer section 2 of the photoconductor 1 and the sheet feeding path 4. A cassette side sheet feeding path 6 and a manual sheet feeding side sheet feeding path 8 for feeding the sheet 3 from the manual sheet feeding section 7 are provided in the conveying path 4.

The conveyance path 4 is formed by a pair of upper and lower guide plates 10 and 11, and a pair of upper and lower first paper feed rollers 1 is provided on the transfer section 2 side.
2,13 are arranged. A shutter 14 for aligning the image and the leading edge of the sheet 3 is arranged on the side of the sheet feeding paths 6 and 8 with respect to the first sheet feeding rollers 12 and 13.

The cassette side sheet feeding path 6 includes a curved plate 15 formed by extending the rear end of the lower guide plate 11 and curved in an arc shape, and a partition plate 16 formed in accordance with the curvature. It is composed of A paper feed roller 17 for feeding the cassette is arranged above the paper feed cassette 5.

The manual feed side paper feed path 8 is a guide plate above the transport path 4.
It is composed of an upper extension plate 18 on which 10 is extended and an upper guide portion of the partition plate 16.

A second roller 19 and a pressure contact roller 20 for conveying the sheet 3 fed from the cassette sheet feeding side and the manual sheet feeding side to the shutter are arranged at the branch portions of the cassette side sheet feeding path 6 and the manual sheet feeding side 8. Has been done.

A rod-shaped first actuator 22 for cassette sheet feeding detection is arranged on the transport path 4 side of the second roller 19 so as to be swingable around the first shaft 21. Further, in the manual sheet feeding path 8, a dog-shaped second actuator 24 for manual sheet feeding detection is arranged so as to be swingable around the second shaft 23. Further, an interlocking arm 25 for interlockingly connecting the first actuator 22 and the second actuator 24 is provided.

The lower end of the first actuator 22 is located in the transport path 4, and the lower end of the second actuator 24 is located in the manual feed side paper feed path 8. The upper ends of the first actuator 22 and the second actuator 24 are pin 27, 28.
Is connected to the interlocking arm 25 by.

Further, the first actuator 22 is in the avoidance posture from the conveyance path 4, that is, when the sheet 3 passes through the conveyance path 4, a sheet for both cassette feeding and manual feeding for detecting the feeding and starting the copying operation. A detection switch 29 is provided.
The paper detection switch 29 is arranged on the rotating first shaft portion 21.

Further, a lock mechanism 31 on the manual feed side is provided for stopping the second actuator 24 when the first actuator 22 is operated and for blocking the feeding from the manual feed section 7. This locking mechanism 31 includes interlock releasing means formed on the interlocking arm 25 for rotating the interlocking arm 25 around the pin 28 by swinging the first actuator 22 during cassette feeding, and other interlocking arm 25. And a stop means for locking the rotated interlocking arm 25 in order to stop the side movement and stop the swing of the second actuator 24.

A pin guide hole 32 for the first actuator 22 is formed in the interlocking arm 25 so as to penetrate in the lengthwise direction of the interlocking arm 25. The pin guide hole 32 constitutes an interlock releasing means.

That is, as the interlocking arm 25 moves with the swing of the second actuator 24, the pin 27 of the first actuator 22 in the straight portion 32a is moved, the first actuator 22 is swung, and the first actuator 22 and the second actuator 22 are moved. Actuator
It is designed to work with 24. Further, as the first actuator 22 swings, the pin 27 pushes the interlocking arm 25 downward while passing through the hem portion 32b, whereby the other side of the interlocking arm 25 moves to the manual feed side. Without being rotated around the pin 28.

In addition, a locking claw 35 is formed downward at the tip of the interlocking arm 25 on the side of the transport path 4, and the stopper 36 that locks the locking claw 35 when the interlocking arm 25 rotates around the pin 28 conveys more than the first actuator 22. It is formed on the main body of the copying machine on the side of the road 4. The stop means is configured by these, and the rotating interlocking arm
Since 25 contacts the stopper 36 and the locking claw 35 is locked, the interlocking arm 25 cannot move to the manual feed side,
The swing of the second actuator 24 is stopped.

In the above configuration, when paper is fed from the manual paper feeding unit 7,
The second actuator 24 is pushed and swings around the second shaft 23. Then, the interlocking arm 25 is pulled toward the manual feed side, and in conjunction with this, the first actuator 22 rotates and turns on the switch 29 on the first shaft 21.

In this case, since the switch 29 is turned on without pressing the copy button, the control section in the main body of the copying machine determines that the sheet is fed from the manual feed side and starts the copy operation.

Next, when the copy button is pressed and paper is fed from the paper feed cassette 5, when the paper 3 is conveyed from the cassette side, the first actuator 22 is pushed and the interlocking arm 25 is provided with the pin guide provided in the arm. It swings down to the V-shaped portion 32b of the hole 32.

Even if you try to insert the paper 3 from this side in this state,
The locking claw 35 provided on the interlocking arm 25 locks on the stopper 36 and cannot move to the right in the drawing. Therefore, the second actuator 24 is in a locked state, and the sheet 3 cannot be inserted. That is, when the paper is fed from the cassette side, the paper cannot be inserted from the manual feed side.

As described above, when the cassette feed side actuator is operating, the manual feed side actuator is locked so that paper cannot be inserted from the manual feed side. Therefore, the cassette side feed path 6 and the manual feed side are Double feeding from both of the paper paths 8 can be prevented, and the occurrence of JAM and the like can also be prevented.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects of the Invention> As is apparent from the above description, according to the present invention, when the cassette feeding side actuator is operating, the manual feeding side actuator is locked so that the paper cannot be inserted from the manual feeding side. Therefore, it is possible to prevent double feeding from both the cassette side paper feed path and the manual feed side paper feed path.
If the occurrence of such problems can be prevented, it will have an excellent effect.

[Brief description of drawings]

1 to 3 are front views showing an embodiment of a sheet feeding device of a copying machine according to the present invention, and FIG. 1 is a state in which neither the cassette feeding side nor the manual feeding side is fed. FIG. 2 is a diagram showing a state where sheets are fed from the manual feed side, and FIG. 3 is a diagram showing a state where sheets are fed from the cassette side by pressing the copy button. 1: Photoconductor, 2: Transfer unit, 3: Paper, 4: Conveyance path, 5: Paper feed cassette, 6: Cassette side paper feed path, 7: Manual paper feed section, 8: Manual paper feed path, 21: 1st axis, 22: 1st actuator, 23: 2nd axis, 24: 2nd actuator, 25: interlocking arm, 29: paper detection switch, 31: locking mechanism.

Claims (1)

[Claims] 1. A cassette side sheet feeding path for feeding a sheet from a sheet feeding cassette to a conveying path, a manual sheet feeding side for feeding a sheet to a conveying path from a manual sheet feeding section, and one end of the conveying path. And a first actuator for cassette paper feed detection, which is positioned so as to be swingable about the first axis, and one end of which is located in the manual feed side paper feed path and is swingably arranged about the second axis. A second actuator for manual paper feed detection, an interlocking arm that interlocks and connects the first actuator and the second actuator,
A paper detection switch for both cassette feeding and manual feeding for detecting paper feeding by swinging the first actuator and starting a copying operation is provided. The first actuator is rotatably connected via a pin, the other end of the first actuator is engaged with one side of the interlocking arm, and the first actuator is interlocked with the movement of the interlocking arm accompanying the swing of the second actuator. Is formed on the interlocking arm that rotates one side of the interlocking arm around the pin by the oscillation of the first actuator when the paper is fed from the paper feed cassette. The interlocking release means and the rotated interlocking arm for stopping the swing of the second actuator by blocking the movement of the other side of the interlocking arm. Sheet feeding apparatus characterized by a stop means for stopping is provided.