JPH09202478A - Paper feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the wearing of a pick roller and a friction roller and perform stable paper feeding by providing the friction roller in a position opposite to the pick roller in the lower part of a hopper and adding a ratchet gear and a lever or a torque limiter to the friction roller. SOLUTION: A pick roller 3 is brought into contact with the uppermost cut sheet of cut sheets 4, the right end of a lever 7 is brought into contact with the lowermost cut sheet and pushed down in the direction of an arrow D against the force of a spring 5 and accordingly the left end of the lever 7 is lifted and engaged with a ratchet gear 6. In this state, the rotation of the pick roller 3 is transmitted to a friction roller 2 via the cut sheets 4 and since the lever 7 and the ratchet gear 6 are engaged with each other, the friction roller 2 is kept still. Thus, two or lower cut sheets 4 are held by friction forces between the cut sheets and between the cut sheets and the friction roller 2 and only the lowermost cut sheet 4 is sent out by the pick roller 3 in the direction of an arrow B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device which is used in a printer device and stacks cut sheets and supplies them one by one.

[0002]

2. Description of the Related Art FIG. 5 is a front view showing an example of a conventional sheet feeding device, and FIG. 6 is a front view showing an operating state of the example of FIG.

A conventional paper feeding device used in a printer device for stacking cut sheets (printing sheets cut into a certain size) and supplying the sheets one by one, stacks the cut sheets 4 as shown in FIG. Hopper 21, a pick roller 23 that comes in contact with the uppermost cut sheet of the cut sheets 4 stacked in the hopper 21 and sends out by a rotational motion, and a friction plate provided on the upper surface of the hopper 23 at a position facing the pick roller 23. 22 and the cut sheets 4 are stacked on the friction plate 22, the pick roller 23 is brought into contact with the uppermost cut sheet, and the pick roller 23 is rotated to feed the cut sheets one by one. Has become.

[0004]

In the conventional sheet feeding device as described above, when the lowest cut sheet is fed out, the pick roller 23 and the friction plate 22 come into direct contact with each other as shown in FIG. When the pick roller 23 rotates in that state,
It has a drawback that the pick roller 23 and the friction plate 22 are worn and normal sheet feeding cannot be performed. Also,
The abrasion powder of the pick roller 23 and the friction plate 22 adheres to the next cut cut paper to contaminate the cut paper, and the friction between the pick roller 23 and the friction plate 22 causes noise. .

[0005]

A first sheet feeding device of the present invention is configured to contact a hopper for stacking cut sheets and a topmost cut sheet of the cut sheets stacked in the hopper, and to rotate the sheets. A pick roller that feeds out the uppermost cut sheet, a friction roller that is provided below the hopper and that faces the pick roller, and that contacts the pick roller via the cut sheet stacked in the hopper; A ratchet gear fixed to the friction roller coaxially with the friction roller, and a central portion rotatably supported so that one end engages with the ratchet gear by a swinging motion and the other end is loaded on the hopper. And a spring for urging the other end of the lever toward the cut sheet.

A second paper feeding device of the present invention is such that a hopper for stacking cut sheets and the uppermost cut sheet of the cut sheets stacked in the hopper are brought into contact with each other to rotate to thereby move the uppermost cut sheet. A pick roller that sends out a pick roller, a friction roller that is located below the hopper and that faces the pick roller, and that is in contact with the pick roller via the cut sheets stacked in the hopper, and that is coaxial with the friction roller. A torque limiter fixed to the friction roller, and the rotation transmission force of the torque limiter, the rotation of the pick roller to the friction roller when the pick roller and the friction roller come into contact with each other through the cut sheet. When the pick roller and the friction roller do not directly contact each other but directly contact with each other, the rotation of the pick roller is transmitted to the friction roller. One in which the.

[0007]

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

FIG. 1 is a front view showing a first embodiment of the present invention, and FIG. 2 is a front view showing an operating state of the embodiment of FIG.

As shown in FIG. 1, this paper feeding device rotates in the direction of arrow A by contacting the hopper 1 for loading the cut sheets 4 and the uppermost cut sheet of the cut sheets 4 loaded in the hopper 1. By doing so, the lowermost cut sheet of the cut rollers 4 provided at a position facing the pick roller 3 that sends out the uppermost cut sheet in the direction of the arrow B and the pick roller 3 below the hopper 1 and stacked on the hopper 1. Friction roller 2 in contact with
And a ratchet gear 6 fixed to the friction roller 2 coaxially with the friction roller 2, and a center portion thereof is rotatably supported, and a left end portion of the ratchet gear 6 is engaged with the ratchet gear 6 by swinging motion. A lever 7 having an end contacting the lowest cut sheet of the cut sheets 4 stacked on the hopper 1, and a spring 5 for urging the right end of the lever 7 toward the cut sheet 4 are provided. .

Next, the operation of the sheet feeding device configured as described above will be described.

When the cut sheets 4 are loaded on the hopper 1,
As shown in FIG. 1, the pick roller 3 is in contact with the uppermost cut sheet of the cut sheet 4. On the other hand, the right end of the lever 7 contacts the lowest cut sheet of the cut sheet 4 and is pushed downward (arrow D) against the force of the spring 5, so that the left end of the lever 7 is lifted. The ratchet gear 6 is engaged. When the pick roller 3 is rotated in the direction of arrow A in this state, the rotation of the pick roller 3 is transmitted to the friction roller 2 via the cut sheet 4, but the lever 7 and the ratchet gear 6 are engaged. The friction roller 2 is in a stationary state because the rotation in the direction of arrow C is blocked. Therefore, the second and subsequent cut sheets of the cut sheet 4 are held by the frictional force between the cut sheets and between the lowest cut sheet and the friction roller 2, and only the highest cut sheet is indicated by the arrow B by the pick roller 3. Sent in the direction.

When all the cut sheets 4 loaded on the hopper 1 are sent out, the pick roller 3 and the friction roller 2 come into direct contact with each other as shown in FIG. , The right end of the lever 7 is lifted in the direction of arrow E by the force of the spring 5, and the left end of the lever 7 is pulled down to be disengaged from the ratchet gear 6. Therefore, when the pick roller 3 rotates in the direction of arrow A, the friction roller 2 also rotates in the direction of arrow C accordingly. Therefore, the pick roller 3 and the friction roller 2 are not worn and noise is not generated.

FIG. 3 is a front view showing a second embodiment of the present invention, and FIG. 4 is a front view showing an operating state of the embodiment of FIG.

The present paper feeding device is provided with a torque limiter instead of the ratchet gear and lever of the embodiment of FIG. 1 as a means for preventing the friction roller from rotating in one direction.

That is, as shown in FIG. 3, the friction roller 12 is provided with a torque limiter 16. When the pick roller 3 rotates in the direction of arrow A, the torque limiter 16 does not transmit the rotation to the friction roller 12 by the rotational force transmitted through the cut sheet 4, and the pick roller 3 and the friction roller 12 directly contact each other. When the contact is made, the rotation of the pick roller 3 is set to be transmitted to the friction roller 12. Therefore, when the cut sheets 4 are stacked on the hopper 11,
As shown in FIG. 3, the friction roller 12 is in a stationary state, and only the uppermost cut sheet is sent out by the pick roller 3 in the direction of arrow B, but all the cut sheets 4 stacked on the hopper 11 are sent out. And as shown in FIG.
Since the pick roller 3 and the friction roller 12 are in direct contact with each other, when the pick roller 3 rotates in the arrow A direction, the friction roller 12 also rotates in the arrow C direction accordingly. Therefore, the pick roller 3 and the friction roller 12 do not wear,
No noise is generated.

[0016]

As described above, in the paper feeding device of the present invention, the friction roller is provided below the hopper at a position facing the pick roller, and when the cut paper is loaded on the hopper, the pick roller and the friction roller are provided. Contact with the pick roller and the friction roller directly when there is no cut sheet on the hopper.By attaching the ratchet gear and lever or torque limiter to the friction roller, By configuring the friction roller to rotate in accordance with the rotation of the pick roller only when the friction roller directly contacts, the pick roller and the friction roller are less worn and stable normal sheet feeding can be performed. At the same time, it is possible to prevent the abrasion powder from adhering to the next stacked cut sheet and contaminating the cut sheet. Also, noise is generated. There is an effect that can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a front view showing an operating state of the embodiment shown in FIG.

FIG. 3 is a front view showing a second embodiment of the present invention.

FIG. 4 is a front view showing an operating state of the embodiment of FIG.

FIG. 5 is a front view showing an example of a conventional paper feeding device.

FIG. 6 is a front view showing an operation state of the example of FIG. 5;

[Explanation of symbols]

 1 ・ 11 ・ 21 Hopper 2 ・ 12 Friction roller 3 ・ 23 Pick roller 4 Cut paper 5 Spring 6 Ratchet gear 7 Lever 16 Torque limiter 22 Friction plate

Claims (2)

[Claims] 1. A hopper for stacking cut sheets, a pick roller for contacting the uppermost cut sheets of the cut sheets stacked in the hopper and sending out the uppermost cut sheets by a rotational motion, and a hopper for the hopper. A friction roller provided at a position facing the pick roller below and contacting the pick roller via the cut paper loaded on the hopper; and a ratchet gear fixed to the friction roller coaxially with the friction roller. A lever that rotatably supports a central portion and engages one end with the ratchet gear and swings the other end with the lowest cut sheet of the cut sheets loaded in the hopper by a swinging motion And a spring that biases the other end of the lever toward the cut sheet. 2. A hopper for stacking cut sheets, a pick roller for contacting the uppermost cut sheets of the cut sheets stacked in the hopper and sending out the uppermost cut sheets by rotational movement, and a pick roller for the hopper. A friction roller provided at a position facing the pick roller below and contacting the pick roller via the cut paper loaded on the hopper, and a torque limiter fixed to the friction roller coaxially with the friction roller. When the pick roller and the friction roller are in contact with each other via the cut sheet, the rotation transmission force of the torque limiter is not transmitted to the friction roller, and the rotation of the pick roller is not transmitted to the friction roller. Paper feed characterized in that the rotation of the pick roller is transmitted to the friction roller when it comes into direct contact with the friction roller. apparatus.