JPH07137848A - Paper feeder - Google Patents

Abstract

PURPOSE:To provide a leaf spring in a surface, coming into contact with paper, of a rear end guide, so as to always press the paper to a separating pawl by this leaf spring. CONSTITUTION:Even in the case of decreasing a residual amount of paper 2 in a frame 1, a position where the paper 2 comes into contact a pick roller 7 can be fixed, and accordingly, since feed timing of the paper 2 by the pick roller 7 can be fixed, displacing a printing position and a pick up mistake can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in a printer,
The present invention relates to a sheet supply device for stacking print sheets cut into a predetermined size and supplying the sheets one by one.

[0002]

2. Description of the Related Art A conventional paper supply device for mounting print paper (paper) cut into a predetermined size on a printer and supplying the cut papers one by one is a paper that regulates the width of the paper set in a frame. The leading end of the paper is lifted while the position of the paper is regulated by the guide and the paper rear end guide that regulates the rear end of the paper, and the pickup mechanism unit takes out and supplies the sheets one by one.

FIG. 2 is a cross-sectional view showing an example of such a conventional sheet feeding device, showing a case where the remaining amount of printing paper is large, and FIG. 3 is a diagram showing a small remaining amount of printing paper in the example of FIG. It is sectional drawing which shows a case.

In FIG. 2, sheets 2 are stacked in a frame 11. The paper guide 13 regulates the width of the paper 2. The trailing edge guide 14 presses and regulates the trailing edge of the sheet 2. The hopper plate 15 presses the uppermost sheet against the pick roller 17 by lifting the front end of the sheet 2 by the spring 16. Pick roller 17
Feeds the paper that is in contact by rotation. The separation claw 18 separates the sheets sent by the pick roller 17 one by one.

The sheet feeding device constructed as described above is
The front end of the sheet 2 stacked on the frame 11 and positioned by the sheet guide 13 and the rear end guide 14 is lifted by the hopper plate 15 to press the uppermost sheet against the pick roller 17 and rotate the pick roller 17. However, when the remaining amount of paper in the frame 11 decreases, the inclination angle of the hopper plate 15 increases as shown in FIG. Therefore, the paper 2
The position of contact with the pick roller 17 is retracted.

[0006]

As described above, in the conventional paper feeding device, when the remaining amount of paper in the frame decreases, the inclination angle of the hopper plate increases and the position where the paper comes into contact with the pick roller recedes. Therefore, there is a drawback in that the timing of feeding the paper is changed by the pick roller, and a print position shift or a pickup error occurs.

[0007]

SUMMARY OF THE INVENTION A sheet feeding device of the present invention comprises a frame for loading print sheets cut into a predetermined size, a sheet guide for limiting the width of the print sheets loaded on the frame, and A paper trailing edge guide that regulates the trailing edge of the printing paper stacked on the frame, a hopper plate that lifts the front end of the printing paper stacked on the frame, and one sheet of the printing paper lifted by the hopper plate. In a paper feeding device of a printer including a pick-up mechanism unit that feeds each one, a leaf spring that presses the trailing end of the printing paper is provided in the paper trailing end guide.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

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

In FIG. 1, the structure and operation of the frame 1, the paper guide 3, the hopper plate 5, the spring 6, the pick roller 7, and the separation claw 8 are the same as those of the conventional example shown in FIGS. 2 and 3. It has the same structure and operation.

On the surface of the trailing edge guide 4 that contacts the paper 2,
A leaf spring 9 is provided, and the leaf spring 9 constantly presses the sheet 2 against the separation claw 8.

In the sheet feeding device having such a configuration, even when the remaining amount of the sheet 2 in the frame 1 becomes small, the sheet 2 is pressed against the separating claw 8 by the leaf spring 9, so that the sheet 2 is picked up. The position of contact with is unchanged. Therefore, the timing of feeding the paper 2 by the pick roller 7 does not change, and the print position does not shift and the pickup error does not occur.

[0013]

As described above, in the sheet feeding apparatus of the present invention, the leaf spring is provided on the surface of the trailing edge guide that comes into contact with the sheet, and the sheet spring constantly presses the sheet against the separating claw. Even when the amount of paper remaining in the frame is low, it is possible to make the position where the paper comes into contact with the pick roller constant, so that the paper feed timing by the pick roller should be constant. Therefore, there is an effect that it is possible to prevent a print position shift and a pickup error.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing an example of a conventional paper supply device, and is a view showing a case where the remaining amount of printing paper is large.

FIG. 3 is a cross-sectional view showing a case where the remaining amount of printing paper is small in the example of FIG.

[Explanation of symbols]

 1/11 Frame 2 Paper 3/13 Paper guide 4/14 Rear end guide 5/15 Hopper plate 6/16 Spring 7/17 Pick roller 8/18 Separation claw 9 Leaf spring

Claims (1)

[Claims] 1. A frame for stacking print paper cut into a predetermined size, a paper guide for restricting a width of the print paper stacked on the frame, and a rear end of the print paper stacked on the frame. Paper supply for a printer including a paper trailing edge guide, a hopper plate that lifts the front edge of the printing paper stacked on the frame, and a pickup mechanism unit that sends out the printing papers held by the hopper plate one by one In the apparatus, the sheet feeding device is characterized in that the sheet trailing edge guide is provided with a leaf spring that presses the trailing edge of the printing sheet.