JPH0225351A - Paper feeder - Google Patents

Abstract

PURPOSE:To make possible the stable feed of recording media one by one and thereby eliminate the trouble of replacing recording media by allowing a recording medium loading table to move vertically through the interlocking of a normal rotation and reversing control for a drive motor. CONSTITUTION:A bearing 1-a is fixed to a paper feed roller and a one-way clutch 2 is retained in the bearing under pressure. The paper feed roller 1 and a paper feed roller shaft 3 are freely detachable. A cam member 6 as a rotary action member which moves a recording medium loading table 5 vertically is fixed on a cam shaft 7, and a gear 8 is arranged beside the cam member 6. A one-way clutch 9 is retained in the gear 8 under pressure, and is freely detachable from the cam shaft 7. In addition, the cam member 6 comes in contact with a cam follower 12 and a detection sensor 18 (e.g., a microswitch) provided on the recording medium loading table 5. Further, a detection sensor 19(e.g., a photosensor) and a pair of feed rollers 20 are installed on the delivery side of the paper feed roller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device for feeding paper, used in printers, for example.

[Conventional technology 1] Conventionally, as a method for automatically feeding cut sheets that serve as recording media, a cassette loaded with recording media of a predetermined size is installed in a printer in advance, and a feeding roller or the like in the printer is used to automatically feed cut paper. There is a cassette feeding method that feeds one sheet at a time using a feeding means, a manual feeding method that feeds recording media placed one sheet at a time directly on the loading table inside the printer, and one method that feeds multiple recording media one sheet at a time. There was a loading platform feeding system that feeds automatically.

[Problems to be Solved by the Invention] The above-mentioned cassette feeding method has the trouble of having to prepare individual cassettes loaded with recording media of a predetermined size, and then attaching and detaching the cassettes according to use. . In addition, in the manual feeding method, recording media must be loaded one by one, and when multiple recording media of the same size are used, there is a problem in that the printer must be loaded with one recording medium at a time.

Furthermore, although the loading platform feeding method does not have the drawbacks of both of the above-mentioned methods, it requires a motor, solenoid, etc. in addition to the feeding motor to operate the loading platform, and for this reason, there are many operating components. This has the disadvantage that the device becomes complicated and expensive.

[Means for Solving the Problems] The paper feeding device of the present invention allows multiple types of recording media to be loaded on a recording medium loading table, and removes the cam, detection sensor, and driving force for lowering the recording medium. It has a one-way clutch, a feeding roller, and a motor that drives them.

Specifically, the present invention provides a paper feeding device that automatically feeds cut paper, including: a reversible drive motor; a cam that is rotationally driven by the drive motor to move a recording medium loading table downward; It is rotated by the drive motor and rotates.
2. A paper feed roller that transports the recording medium of the recording medium stacking table, a first one-way clutch that rotates the cam in one direction, and a 1-way clutch that rotates the paper feed roller in the opposite direction to the rotational direction of the cam. a second one-way clutch that rotates the cam; a first detection sensor that detects the rotation of the cam and reverses the drive motor to rotate the paper feed roller; and a first detection sensor that rotates the paper feed roller by detecting the rotation of the cam; and a second detection sensor that detects that the medium has been carried out and reverses the drive motor to rotate the cam.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view showing the structure of a drive section, and FIG. 3 is a sectional view showing the structure of a brake device of the drive section. A bearing 1-a is fixed to the paper feed roller 1, and a one-way clutch 2 is press-fitted into the bearing 1-a, and the paper feed roller 1 and the paper feed roller shaft 3 can be connected to each other and detached from each other. Further, a gear 4 is fixed to an end of the paper feed roller shaft 3.

A cam member 6 serving as a rotational member for moving the recording medium loading table 5 up and down is fixed on a cam shaft 7, and a gear 8 is disposed beside the cam member 6. A one-way clutch 9 is press-fitted into the gear 8 and is detachable from the camshaft 7.

A spring 10 is applied to the free end of the recording medium loading table 5, and urges the recording medium 11 on the recording medium loading table 5 toward the paper feed roller l.

Further, the cam member 6 as a rotational member is connected to a cam follower 12 and a detection sensor 18 (
For example, it comes into contact with a micro switch).

A recording medium separating member 13 is provided at the do of the paper feed roller 1 so as to convey the topmost sheet of the plurality of recording media 11 placed on the recording medium stacking table 5, and the recording medium separation member 13 is provided below the paper feed roller l. It is pushed up by the spring 14. Also, the paper feed roller
A detection sensor 19 (for example, a photo sensor) is installed on the output side of the
A pair of feed rollers 20 are provided.

A gear 16 is fixed to the shaft 16 of a drive motor 15 that automatically feeds the recording medium 11, and driving force is transmitted to the paper feed roller shaft 3 and the cam shaft 7 via gears 17, respectively. It has become.

A brake material 22 is fixed to the left end of the camshaft 7 by a parallel pin 23, the brake material 21 is fixed to a frame 25, and the force of the spring 24 applies a constant brake against the rotation of the camshaft 7. It's like applying force.

Next, the operation of this embodiment will be explained.

When the drive motor 15 is at rest, it is connected to the gear 4 via the gear 17.
The driving force is transmitted to the paper feed roller l, and the paper feed roller l rotates in the normal direction. In this case, since the gear 17 and the gear 8 are in mesh with each other, the gear 8 rotates, but the one-way clutch 9 inside the gear 8 does not fix the camshaft 7 and the cam member 6.

On the other hand, when the drive motor 15 rotates in reverse, the driving force is transmitted to the gear 8 via the teeth 1'j 17, and the one-way clutch 9 operates to rotate the camshaft 7 and the cam member 6. At this time, since gear 17 and gear 4 are in mesh,
Although the gear 4 and the paper feed roller shaft 3 rotate, the paper feed roller 1
does not rotate due to the one-way clutch 2 inside the bearing 1-a.

Here, according to the paper feed signal, when the paper feed is possible, the cam member 6
The recording medium loading table 5 is pushed down. This poem,
The cam member 6 and the detection sensor 18 are in contact with each other, and in this state, the recording medium loading platform 5 is separated from the paper feed roller l.
The recording medium loading table 5 is also separated from the paper feed roller l, so that the recording medium 11 can be replenished.

Next, when a feeding command is issued by a paper feeding signal, the drive motor 15 first rotates in the reverse direction, and the one-way clutch 9 of the gear 8 and the camshaft 7 engage, and the cam member 6 of the camshaft 71-
rotates. Then, the cam member 6 and the cam follower 12 are disengaged, and the recording medium loading platform 5 is lifted up by the spring 10 attached to its free end until it comes into contact with the lower surface of the paper feed roller 1.

On the other hand, as the cam member 6 rotates, the detection sensor 18 turns off, and at the same time, the drive motor 15
performs a forward rotation. Then, the sheet of recording medium 11 caught between the paper feed roller 1 and the recording medium separation material 13 is conveyed toward the detection sensor 19 by the forward rotation of the paper feed roller 1. When the leading edge of the recording medium 11 is detected by the detection sensor 19, the drive motor 15 performs +lTl moderate rotation. This reverse rotation causes the cam member 6 to rotate and come into contact with the cam follower 12 of the recording medium loading platform 5 to push down the recording medium loading platform 5. As a result of this pressing down, the cam member 6 and the detection sensor 18 come into contact with each other, the detection sensor 18 is turned on, and the drive motor 15 rotates in the normal direction again. This forward rotation causes the paper feed roller 1 to rotate again, and the recording medium 11 is conveyed from the position of the detection sensor 19 to a pair of feed rollers 20, where it is caught by the feed rollers 20 and forms a fixed loop.

Here, the drive motor 15 is rotated by a distance from which the recording medium 11 forms a loop between the detection sensor 19 and the feed roller 20 until the recording medium 11 is bitten by the feed roller 20, and then stopped. The feeding of the second and subsequent recording media placed on the recording medium loading platform 5 is also performed by controlling the forward and reverse rotations of the drive motor described above. Furthermore, when the detection sensor 19 does not detect the recording medium 11 within a certain period of time in the above-described operation, it generates a paper alarm indicating that the paper is out.

Furthermore, due to the effect of the one-way clutch 9 provided in the gear 8 of the camshaft 7, when the camshaft 7 and the gear 8 are disengaged,
The cam member 6 is prevented from idling by the force of the spring 10 that lifts up the recording medium loading table 5.
It is located below the paper feed roller 1 while being in contact with the upper cam follower 12. Therefore, the collision force when the paper feed roller 1 and the recording medium 11 come into contact is alleviated, and the recording medium 11 does not slip, the frequency of skew double feeding is reduced, and the collision noise is reduced, so that stable feeding is achieved. be done.

[Effects of the Invention] As explained above, the present invention allows a plurality of recording media to be stably fed one by one by moving the recording medium loading table up and down in conjunction with the forward/reverse control of the drive motor. Since there is no need for special cassettes for each predetermined size, there is no need to change the recording medium, the recording medium can be easily replenished, and the apparatus can be made compact and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the configuration of a drive section, and FIG. 3 is a cross-sectional view of a brake device of the drive section. 1: Paper feed roller 2: One-way clutch 5: Recording medium loading table 6: Cam member 9: One-way clutch 11: Recording medium 15: Drive motor 18. 19: Detection sensor 20: Feed roller 21. 22 Brake material

Claims (1)

[Claims] A paper feeding device that automatically feeds cut paper includes a reversible drive motor, a cam that is rotationally driven by the drive motor to move a recording medium loading table up and down, and a cam that is rotationally driven by the drive motor and rotates. A paper feed roller that conveys the recording medium on the recording medium loading table, a first one-way clutch that rotates the cam in one direction, and a second one-way clutch that rotates the paper feed roller in a direction opposite to the rotation direction of the cam. a one-way clutch, a first detection sensor that detects the rotation of the cam and reverses the drive motor to rotate the paper feed roller, and detects that the recording medium is unloaded by the rotation of the paper feed roller. and a second detection sensor that reverses the drive motor and rotates the cam.