JPH07137873A - Paper supplier - Google Patents

Abstract

PURPOSE:To fix a printing position by providing a correcting spring formed of leaf spring in a paper guide, and setting a deformation amount of the correcting spring almost in proportion to an amount of paper on a hopper plate, so as to fixedly hold a condition of loosening the paper on the hopper plate and dispersing a position of each paper. CONSTITUTION:A correcting spring 6 formed of leaf spring is provided in an internal surface of a paper guide 2a, and a point end part of this correcting spring 6, in a free condition, is tilted to a side of a paper guide 2b as shown by a dotted line 6a. By this constitution, in the case of large residual amount of paper 5 on a hopper plate 4, the correcting spring 6 is largely deflected to increase force of pressing the paper 5, but when decreased the residual amount of the paper 5 on the hopper plate 4, a deformation amount of the correcting spring 6 is decreased. Accordingly, pressing force of the correcting spring 6 is changed in proportion to almost the amount of the paper 5 on the hopper plate 4, to almost fix a pressure applied to a sheet of the paper.

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 feeding device for loading printing paper (paper) cut into a predetermined size on a printer and feeding the sheets one by one presses both sides of the paper set in a frame. The paper is lifted while the position of the paper is regulated by individual paper guides, and picked up one by one by the pickup mechanism to supply the paper.

FIG. 4 is a cross-sectional view showing an example of such a conventional paper feeding apparatus, and FIG. 5 is a cross-sectional view taken along the line BB of the example of FIG. FIG. 6 is a sectional view taken along line BB of the example of FIG. 4, showing a case where the remaining amount of printing paper is small.

In FIG. 4, sheets 5 are stacked on the hopper plate 4 in the frame 1. A paper retainer 11 is provided on the inner side surface of the paper guide 2 a via a paper retainer spring 12, and the paper retainer 11 and the paper guide 2 b press both sides of the paper 5 stacked on the hopper plate 4. The position of the sheet 5 is regulated to prevent the sheet 5 from rattling and the position of each sheet from varying. The hopper plate 4 presses the uppermost sheet against the pick roller 8 by lifting the sheet 5 by the hopper plate spring 3. Pick roller 8 is bearing 7
Is rotatably supported at its both ends by the frame 1, and is rotated by being driven by a pick motor 10 via a pick gear 9 to send out the uppermost paper of the paper 5 in contact with the pick roller 8. .

As shown in FIG. 5, the position of the rear end of the paper 5 is regulated by the paper rear end guide 13, and the front end of the paper 5 is lifted by the hopper plate 4 and picked by the pick roller. 8 and the pick roller 8 is rotated to be sent out. At this time,
Only one sheet is separated and sent out by the separating claw 15.

[0006]

As described above, in the conventional sheet feeding device, since the pressure of the sheet pressing spring 12 is constant, when the amount of the sheet remaining on the hopper plate becomes small, one sheet is fed. The pressure applied to the paper becomes relatively large. Therefore, there is a drawback in that the state of rattling of the paper and the variation of the position of each paper changes depending on the amount of the paper on the hopper plate, resulting in non-uniform printing positions.

When the remaining amount of paper on the hopper plate decreases, the inclination angle of the hopper plate 4 increases as shown in FIG. 6, so that the position of the paper 5 in contact with the pick roller 8 recedes. For this reason, there is also a drawback that the timing at which the pick roller 8 is fed out changes depending on the remaining amount of paper, which causes a shift in the printing position of the printer and a paper feed error.

[0008]

A first sheet feeding device of the present invention is a hopper for accommodating a printing sheet cut into a predetermined size and a hopper provided with the printing sheet stacked in the frame. A plate, a hopper plate spring for lifting the hopper plate, a pair of paper guides provided in the frame for restricting the lateral position of the print paper mounted on the hopper plate, and a pair of paper guides A leaf spring provided on the inner side surface of one of the paper guides and mounted on the hopper plate to change the pressing force against the print paper according to the amount of the print paper, and the print paper lifted by the hopper plate. And a pick-up mechanism section for sending out one by one.

A second paper feeding device of the present invention is a frame for accommodating a printing paper cut into a predetermined size, a hopper plate for mounting the printing paper loaded in the frame, and a hopper plate. A hopper plate spring that raises the hopper, a pair of paper guides that are provided in the frame and regulate the lateral position of the printing paper mounted on the hopper plate, and at least one of the pair of paper guides. A leaf spring that is provided on the inner side surface and that is mounted on the hopper plate to change the pressing force on the printing paper according to the amount of the printing paper,
A paper trailing edge guide that is provided in the frame and regulates the position of the trailing edge of the printing paper that is mounted on the hopper plate; and the printing that is mounted on the hopper plate that is provided on the inner side surface of the paper trailing edge guide. It is provided with a leaf spring that presses the paper and a pickup mechanism unit that feeds out the print paper lifted by the hopper plate one by one.

[0010]

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.
FIG. 2 is a diagram showing a case where the remaining amount of printing paper is large, FIG. 2 is a sectional view showing a case where the remaining amount of printing paper is small in the embodiment of FIG. 1, and FIG. Is.

In FIG. 1, the frame 1 and the paper guides 2a and 2b, the hopper plate spring 3, the hopper plate 4, the bearing 7, the pick roller 8, the pick gear 9 and the pick motor 10 are the same as those of the conventional example shown in FIG. The configurations and operations of the corresponding parts are the same. The sheet guides 2a and 2b include a fixed type and a movable type that moves one or both of them according to the width of the sheet.

A correction spring 6 formed of a leaf spring is provided on the inner surface of the paper guide 2a, and the tip end of the correction spring 6 is a dotted line (reference numeral 6a) in the free state.
As shown in, the sheet guide 2b is inclined.

In the paper feeding apparatus thus constructed, when the remaining amount of the paper 5 on the hopper plate 4 is large, the correction spring 6 is largely bent, so that the force for pressing the paper 5 becomes large. When the remaining amount of the sheet 5 on the plate 4 decreases, the amount of deformation of the correction spring 6 decreases as shown in FIG. Therefore, the pressing force of the correction spring 6 changes substantially in proportion to the amount of the sheet 5 on the hopper plate 4, and the pressure applied to one sheet becomes almost constant.

The correction spring 6 may be provided on both the paper guides 2a and 2b.

As shown in FIG. 3, the trailing edge portion of the sheet 5 is pushed toward the separating claw 15 by the leaf spring 14 provided on the inner side surface of the sheet trailing edge guide 13, and thus the sheet 5 is pulled. The leading edge of the paper is the paper 5 on the hopper plate 4.
The pick roller 8 is always in a fixed position regardless of the remaining amount of
Contact with. Therefore, the timing when the pick roller 8 is sent out by the rotation of the pick roller 8 is constant.

[0017]

As described above, in the sheet feeding device of the present invention, the sheet guide is provided with the correction spring of the leaf spring,
By making the amount of deformation of the correction spring approximately proportional to the amount of paper on the hopper plate, the pressure applied to one sheet of paper can be adjusted regardless of the amount of paper on the hopper plate.
The effect is that it can be made almost constant, so that it is possible to make the print position uniform by keeping the state of rattling of the paper on the hopper plate and the variation of the position of each paper constant. effective. Furthermore, by providing a leaf spring that presses the printing paper inside the paper trailing edge guide that regulates the position of the trailing edge of the printing paper, it is always possible to maintain a constant position regardless of the remaining amount of printing paper on the hopper plate. There is an effect that the printing paper can be brought into contact with the pick roller, and the timing when the printing paper is sent out by the rotation of the pick roller can be made constant, so that the deviation of the printing position of the printer and the misfeeding of the paper can be prevented. There is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and is a view showing a case where the remaining amount of printing paper is large.

FIG. 2 is a cross-sectional view showing a case where the remaining amount of printing paper is small in the embodiment of FIG.

FIG. 3 is a sectional view taken along the line AA of the embodiment shown in FIG.

FIG. 4 is a cross-sectional view showing an example of a conventional paper supply device.

5 is a cross-sectional view taken along line BB of the example of FIG. 4, showing a case where the remaining amount of printing paper is large.

6 is a cross-sectional view taken along the line BB of the example of FIG. 4, showing a case where the remaining amount of printing paper is small.

[Explanation of symbols]

 1 Frame 2a / 2b Paper Guide 3 Hopper Plate Spring 4 Hopper Plate 5 Paper 6 Compensation Spring 7 Bearing 8 Pick Roller 9 Pick Gear 10 Pick Motor 11 Paper Hold 12 Paper Hold Spring 13 Paper Rear Edge Guide 14 Leaf Spring 15 Separation Claw

Claims (2)

[Claims] 1. A frame for accommodating a print sheet cut into a predetermined size, a hopper plate for mounting the print sheet stacked in the frame, a hopper plate spring for lifting the hopper plate, and A pair of paper guides provided in a frame for regulating the lateral position of the printing paper mounted on the hopper plate, and the hopper plate provided on the inner side surface of at least one paper guide of the pair of paper guides. And a pick-up mechanism section that feeds the printing papers lifted by the hopper plate one by one. Paper feeding device. 2. A frame for accommodating a print sheet cut into a predetermined size, a hopper plate for mounting the print sheet stacked in the frame, a hopper plate spring for lifting the hopper plate, and A pair of paper guides provided in a frame for regulating the lateral position of the printing paper mounted on the hopper plate, and the hopper plate provided on the inner side surface of at least one paper guide of the pair of paper guides. Mounted on the leaf spring for changing the pressing force against the printing paper according to the amount of the printing paper, and the paper rear for controlling the position of the rear end of the printing paper mounted on the hopper plate provided in the frame. An end guide and a rear end guide of the paper, which are provided on the inner side surface and are mounted on the hopper plate, press the printing paper. A sheet feeding device, comprising: a leaf spring; and a pickup mechanism unit that feeds the print sheets lifted by the hopper plate one by one.