KR200336750Y1 - Apparatus for feeding paper of image forming device - Google Patents

Abstract

The present invention relates to a paper feeder of an image forming apparatus, wherein a pinion is formed at an outer end while a second shaft is penetrated through a side wall of the main frame, and a rear guide is installed on the rear guide of the main frame so as to be movable forward and backward. A mating rack is formed to extend, and a connecting body is coupled to the subplate supporting the paper stacking plate from the lower side, and a second tensile coil spring is connected to the connecting body and the second shaft.

According to the present invention configured as described above, when the rear guide is moved to align the paper, the rack moves in unison with the rear guide to rotate the pinion. The elastic force becomes large.

As a result, the paper is aligned, and the paper feed pressure is adjusted to a paper feed pressure suitable for the loaded paper, so that the paper feed pressure can be adjusted in several stages, thereby preventing misfeeding or condensation, and for controlling the paper feed pressure separately. You do not need to perform the operation of the can improve the ease of use.

Description

Paper feeder of image forming apparatus {APPARATUS FOR FEEDING PAPER OF IMAGE FORMING DEVICE}

The present invention relates to a paper feeder for an image forming apparatus, and more particularly, an image forming apparatus for maintaining an appropriate paper feed pressure according to the type of printing paper, and for aligning the paper regardless of the paper size. It relates to a paper feeding device.

In general, an image forming apparatus such as a printer, a copying machine, a facsimile, or the like refers to a device for printing data on a recording sheet, copying data printed on the sheet, or transmitting data. do.

The paper feeding apparatus will be described below with reference to the accompanying drawings.

As shown in Fig. 1 and Fig. 2, the paper feeding apparatus is configured to feed a paper cassette 1 on which a plurality of sheets are stacked, and a sheet of paper loaded on the paper cassette 1 while being rotated using a driving motor (not shown) as a driving source. Pick-up roller (2) to be supplied to, and a feed pressure adjusting device for sheet feeding.

The paper feeder 1 includes a main frame 10 having a paper receiving part 11 therein and an open rear side thereof, and a paper stacking plate 12. The paper cassette 1 slides forward and backward on the rear opening side of the main frame 10. And the rear guide 13 for aligning the paper is possible.

In addition, as shown in FIGS. 1 to 3, the paper feed pressure adjusting device is disposed in the width direction inside the paper feed cassette main frame 10 while guides having both ends curved in a sidewall of the main frame 10. A first shaft 20 coupled to the 14, a second shaft 30 disposed at a predetermined distance away from the first shaft 20 in a forward direction, and one end of which is rotatably coupled to the side wall of the main frame 10; , The sub plate 40 disposed below the paper stacking plate 12 to support the paper stacking plate 12 upward, connected to the sub plate 40, and connected through the hinge 51 to the main frame 10. Connecting frame 50 rotatably coupled to the side wall of the first, the first fastening piece 52 extending upward from one end of the connecting frame 50 and the second fastening piece extending horizontally therefrom ( 53 and the first connecting piece 52 and the first shaft 20. A tension coil spring 60, a second tension coil spring 61 fixed to the second fastening piece 53 and the second shaft 30, and a compression coil spring provided below the paper loading plate 12 ( 62).

In addition, a fixing groove 14a to which the first shaft 20 is fixed is formed at the lower end of the first shaft guide hole 14 to restrain the elastic force of the first tension coil spring 60.

In addition, an extension piece 31 having a knob 31a is formed at an end of the second shaft 30 so as to restrain the elastic force of the second tension coil spring 61, and is fixed to one surface of the extension piece 31. A protrusion 32 is formed, and when the second shaft 30 is rotated, a guide long hole 15 is formed to draw a rotational trajectory of the fixed protrusion 32 of the extension piece 31, and a predetermined distance from the guide long hole 15. Where the spaced apart is a fixing hole 16 to which the fixing projections 32 of the second shaft 30 is fitted.

A plurality of rollers 41 are provided at the end of the sub plate 40 in contact with the paper stacking plate 12.

Referring to the operation of the feed pressure regulator according to the prior art configured as described above are as follows.

The initial feeding pressure is that the first shaft 20 is located in the fixing groove 14a of the shaft guide hole 14, and the fixing protrusion 32 of the second shaft 30 is free along the guide slot 15. It is positioned to exercise. That is, such a state is a state in which the pressure applied to the paper stacking plate 12 by the subplate 40 is minimized.

In order to increase the feeding pressure, the fixing protrusion 32 is rotated by rotating the knob 31a of the second shaft 30 in the state where the tensile force of the first tension coil spring 60 is applied through the first shaft 20. And fixed to the fixing hole 16, the first and second tension coil springs 60 and 61 are simultaneously tensioned. That is, the subplate 40 receives the tensile force of the first and second tensile coil springs 60 and 61 at the same time, so that the pressing force applied to the paper loading plate 12 is maximized.

In addition, when the paper is tilted when the paper is loaded on the paper stacking plate, the image is printed in an inclined manner. Thus, after loading the paper on the paper stacking plate 12, the paper is aligned while sliding the rear guide 13 forward and backward. Let's go. Multi-stage guide grooves 10a are formed on the bottom surface of the main frame 10, and guide protrusions 13a are elastically fitted to the multi-stage guide grooves 10a on the bottom surface of the rear guide 13.

However, in the conventional paper feeder configured as described above, the paper feed pressure can be adjusted by rotating and fixing the second shaft 30. However, since the paper feed pressure can be adjusted only in two stages, the paper feed pressure of various types of paper may not be properly adjusted. There is a problem.

And, the operation is very cumbersome because the knob 32a must be operated in the state in which the paper is aligned when the paper feed pressure is adjusted.

In addition, although the paper can be aligned to some extent through the rear guide 13, it is very difficult to process the guide groove 10a in the main frame 10 of the paper feed cassette 1, so that the paper can be arranged with the rear guide 13. Since it is impossible to align correctly, and side alignment of the paper is impossible, there is a problem in that the paper cannot be aligned when the size difference is large, such as an envelope.

The present invention was devised to solve the above-mentioned problem, and simplifies the operation of adjusting the feeding pressure, and enables fine adjustment of the feeding pressure to form a sheet of paper regardless of the paper size. It is an object of the present invention to provide a paper feeding device.

Another object of the present invention is to simplify the operation for adjusting the paper feed pressure by adjusting the paper feed pressure at the same time as the alignment of the paper.

In addition, another object of the present invention is to enable fine adjustment of the guide for the alignment of the paper to effectively align the paper.

1 is a side view of a paper cassette according to the prior art.

2 is a cross-sectional view showing the internal structure of the paper feed cassette according to the prior art.

Figure 3 is a perspective view of the paper feed pressure regulating device according to the prior art.

4 is an exploded perspective view of a paper feed cassette according to the prior art.

5 is a perspective view of a paper feed pressure adjusting device applied to an embodiment of the present invention.

Figure 6 is a cross-sectional view showing the internal structure of an embodiment according to the present invention.

7 is a perspective view showing a paper alignment guide applied to the embodiment according to the present invention.

<Description of Symbols for Main Parts of Drawings>

30: second shaft 61: second tension coil spring

70,73 Rear Guide 71,72 Side Guide

80: rack 90: rack

The paper feeding apparatus of the present invention image forming apparatus for achieving the above object is provided with a paper cassette equipped with a paper container for loading paper, and is provided on the paper feed port side of the paper cassette and rotated through a driving means. A pickup roller for supplying sheets of paper stacked in the paper feed cassette, and a paper feed pressure adjusting device for controlling paper feed pressure, wherein the paper feed pressure adjusting device supports a paper loading plate inside the paper cassette from below. And a shaft rotatably coupled to one side wall of the paper feed cassette, and an elastic member fixed to the shaft and the subplate.

The paper feed cassette includes a main frame and a paper alignment guide, wherein the paper alignment guide comprises: a first rear guide slidably installed back and forth on a rear side of the main frame, and a first sliding guide independently of the first rear guide. And a first side guide and a second side guide slidably mounted on the first rear guide and interlocked with the first rear guide.

It is preferable to further include a second rear guide installed on the second side guide so as to slide forward and backward.

It is preferable to adjust the elastic force of the elastic member by a linear reciprocating motion of the rack further comprises a pinion formed at the end of the shaft and a rack engaged with the pinion while being slidably installed back and forth on the sidewall of the paper feed cassette. Do.

The rack is connected to the rear guide is preferably operated in conjunction with the sliding of the rear guide.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a perspective view of a paper feed pressure adjusting device applied to an embodiment according to the present invention, Figure 6 is a cross-sectional view showing a structure of an embodiment according to the present invention, Figure 7 is a paper alignment guide applied to the embodiment according to the present invention An exploded perspective view to show For convenience of description, the same member numbers are assigned to the same constituent members as in the prior art.

As shown in the drawing, the paper feeding apparatus of the present invention image forming apparatus includes a paper feed cassette 1 and a pickup roller 2 for picking up sheets of paper loaded in the paper cassette 1 while rotating with the driving motor as a driving source. And a paper feeding pressure adjusting device for giving a paper feeding pressure suitable for printing paper.

The paper feed cassette 1 is composed of a main frame 10 and a sheet alignment guide sliding on the main frame 10 back and forth, or left and right.

The paper alignment guide is a first rear guide 70 provided at the rear opening side of the main frame 10 and a front side of the main frame 10 so as to be able to slide independently of the first rear guide 70. A first side guide 71, a second side guide 72 slidably installed on one side of the first rear guide 70, and a second side guide 71 slidably mounted on the second side guide 71; It consists of two rear guides 73. That is, when the first rear guide 70 slides, the second side guide 72 and the second rear guide 73 slide simultaneously.

Although not shown in the drawings, each guide 70, 71, 72, 73 is provided with a plurality of guide grooves and guide projections to be set in multiple stages, in particular, the second side guide 72 and the second rear guide. The guide grooves 73 are arranged at narrow intervals to enable fine adjustment.

And, the paper feed pressure adjusting device, the first side is arranged in the width direction inside the paper feed cassette main frame 10, the both ends are coupled to the first shaft guide hole 14 formed in a curved shape on the side wall of the main frame 10. The shaft 20, the second shaft 30, which is spaced apart from the first shaft 20 by a predetermined distance, and whose one end is rotatably coupled to the side wall of the main frame 10, the paper stacking plate 12, A subplate 40 disposed below and supporting the paper loading plate 12 upwardly, connected to the subplate 40, and rotatably coupled to a side wall of the main frame 10 via a hinge 51. Connecting frame 50, the first fastening piece 52 extending upward from one end of the connecting frame 50 and the second fastening piece 53 extending horizontally therefrom and the first fastening piece First tension coil spring 60 connected to the 52 and the first shaft 20, Claim 2 is fixed to the fastening piece 53 and the second shaft 30 2 is configured to include a tension coil spring 61 and the compression coil spring 62 is installed on the lower side of the sheet stacking plate 12.

The pinion 80 is formed at the outer end of the second shaft 30, and the rack 90 extending from the first rear guide 70 is engaged with the pinion 80. That is, the pinion 80 is rotated by the sliding of the first rear guide 70, so that the second tensile coil spring 61 is tensioned or compressed.

Referring to the operation of the paper feed pressure regulating device of the present invention paper cassette having such a configuration as follows.

The paper feeding pressure is changed by the operation of the first shaft 20 and the second shaft 30, and the adjustment of the paper feeding pressure by the first shaft 20 is the same as in the prior art, and thus omitted, according to an embodiment of the present invention Only the operation will be described.

After loading the paper on the paper stacking plate 12 for loading the paper, and then moving the first rear guide 70 forward and backward to align the paper, the rack 90 is moved integrally, sliding of the rack 90 The pinion 80 is rotated by.

The second tension coil spring 61 is wound around the second shaft 30 by the rotation of the pinion 80 and is tensioned. That is, the paper feeding pressure by the sub plate 40 becomes large.

And, when the operation of the paper alignment guide employed in the present invention paper feeder is described, after loading the paper on the paper stacking plate 12, first move the first rear guide 70 and the first side guide 71 Roughly align the front, rear, left and right of the paper. Each guide 70, 71 is elastically fixed to the guide groove (not shown).

Subsequently, the second side guide 72 and the second rear guide 73 are moved to finely align the paper.

The second rear guide 73 slides finely on the second side guide 72, and the second side guide 72 slides finely on the first rear guide 70 to finely align the paper. .

Therefore, while the paper feed pressure is changed only in two stages by the rotation operation of the second shaft in the related art, according to the paper feed pressure adjusting device applied to the embodiment of the present invention, the second tension coil spring 61 by the rotation of the pinion (80). ), The elastic force is changed so that the feeding pressure can be adjusted in multiple stages.

In addition, since the paper feed pressure is automatically adjusted by the operation of the first rear guide 70, it is not necessary to perform a separate operation for adjusting the paper feed pressure as in the related art.

In addition, the paper can be finely aligned, and the side guides 71 and 72 can effectively align the sides of the paper, and the paper can be finely aligned. It will not be supplied as it is.

As described above, according to the sheet feeding apparatus of the subject innovation image forming apparatus, the sheet feeding pressure is changed in multiple stages so that various types of printing paper can be supplied in a single sheet, thereby preventing miss feeding or feeding.

In addition, since the paper feeding pressure is automatically adjusted according to the size of the printing paper, convenience in use is improved.

In addition, since the paper can be accurately aligned, the pickup can be maintained to maintain the print quality, thereby improving the reliability of the product.

Claims (4)

A paper feed cassette provided with a paper receiving portion for loading paper, a pickup roller installed at the paper feed port side of the paper feed cassette, rotated by a driving means, and feeding the paper loaded in the paper feed cassette in a sheet; And a paper feed pressure adjusting device, wherein the paper feed pressure adjusting device includes a sub plate supporting a paper stacking plate inside the paper feed cassette from below, a shaft rotatably coupled to one side wall of the paper feed cassette, and the shaft. And a resilient member fixed to the subplate, The paper feed cassette includes a main frame and a paper alignment guide, wherein the paper alignment guide comprises: a first rear guide slidably installed back and forth on a rear side of the main frame, and a first sliding guide independently of the first rear guide. And a second side guide installed on the first rear guide so as to slide left and right on the first rear guide and interlocked with the first rear guide. 2. The paper feeding apparatus of claim 1, further comprising a second rear guide mounted on the second side guide to be slidable back and forth. The elastic force of the elastic member of claim 1, further comprising a pinion formed at an end of the shaft and a rack engaged with the pinion while being slidably installed on the sidewall of the paper feed cassette. Feeding apparatus of the image forming apparatus, characterized in that for adjusting the. The paper feeder of claim 2 or 3, wherein the rack is connected to the rear guide to operate in conjunction with sliding of the rear guide.