JPH107265A - Paper feeding pressure adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly hold pressing force of a pair of pressure springs working on decalcomania paper regardless of size of the decalcomania paper to be stored in a paper feeding tray main body on a paper feeding device of a one side paper feeding standard. SOLUTION: A spring 2 working on a bottom plate 9 is provided to either one side of a pair of pressure springs 14, 14 making contact with the bottom plate 9 to mount decalcomania paper 17. Pressing force working on the decalcomania paper 17 is uniformed regardless of size of the decalcomania paper 17 by drawing this spring 2 by a lever member 3 in correspondence with the side of the decalcomania paper 17 and adjusting the pressing force of the pressure springs 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed pressure adjusting device for adjusting a pressing force of a transfer paper in a paper feed device based on one-sided paper feed provided in office equipment such as a copying machine, a facsimile, and a printer. The present invention relates to a paper feed pressure adjusting device capable of adjusting a pressing force according to the size of a transfer sheet.

[0002]

2. Description of the Related Art FIG. 7 shows a schematic structure of a general paper feeder. The sheet feeding device includes a frame-shaped sheet feeding tray body 10 a having a grip portion 12 and a sheet feeding tray body 10
a pair of side fences 18 slidably supported by a
a, 18a, and the paper feed tray body 10a along the front-rear direction.
End fence 19a slidably supported by the paper feed tray main body 10a at the base end side, and transfer paper 17
8, a pair of pressure springs 14, 14 and the like for pressing the bottom plate 9a toward the separating claw 20 of the transfer paper 17 are provided.

[0003] The side fences 18a, 18a are configured to move in a direction approaching or separating from each other only by moving the one side fence 18a in the left-right direction. Transfer paper 1 of various sizes with the above structure
Reference numeral 7 denotes a pair of side fences 18a, 18a and an end fence 19a, which hold both side surfaces and a rear surface thereof.
In the state where the front and the vertical direction are regulated by 0, it is mounted and supported on the bottom plate 9a.

[0004]

In order to separate the transfer papers 17 mounted on the bottom plate 9a one by one via a corner claw 20 and feed them smoothly into the apparatus, the transfer papers 17 are pressed by a pressure spring 14. Need to be pressed uniformly and at an appropriate pressure. As shown in FIG. 7 and FIG.
In the case of a paper feeder based on a double-sided paper supply in which both side surfaces are held by a and 18a, the pressure spring 14 is always disposed at a symmetrical position with respect to the transfer paper 17, and even if the size of the transfer paper 17 is different. As shown in FIG. 9, the pressure spring 14 abuts on a symmetrical position of the transfer paper 17. That is, the bottom plate 9a by the pressure springs 14,
The left and right pressing forces become even.

However, even if the pressing force on the left and right sides is equal, the weight of the transfer paper 17 changes depending on the size of the transfer paper 17, so it is necessary to change the pressing force of the pressure spring 14 in accordance with the size of the transfer paper 17. An apparatus for adjusting the pressing force of the pressure spring 14 is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-28647. In this "paper feeder", the adjusting lever (11) is engaged with the pressing spring (4), and the pressing spring (14) is pressed by the adjusting lever (11) in accordance with the size of the transfer paper (3). The pressing force on the transfer paper is changed by changing the spring force.

As described above, in the case of the paper feed pressure adjusting device in the paper feeder based on the double-sided paper feed, there is no particular problem even if the size of the transfer paper 17 changes, but as shown in FIG. In the case of the above, there are the following problems. That is, for example, it is assumed that a pair of pressure springs 14, 14 are disposed at symmetric positions with respect to the large B paper 15 as shown in FIG. Also,
In the case of the A paper 16 having a size smaller than that of the B paper 15, the pair of pressure springs 14, 14 are set symmetrically with respect to the A paper 16, and the pressing force applied to the A paper 16 is equal. No longer. If the transfer paper 17 is fed with uneven pressing force, the feeding is not performed smoothly and the corner claw 20
Separation also worsens, causing problems such as skew,
There is a problem that the transfer paper 17 becomes defective. In this case, the spring force of the pressure spring in the one-sided paper feeding device cannot be adjusted uniformly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a paper feeder based on one-sided paper feeding, the pressing force of the left and right pressure springs is reduced even if the size and type of transfer paper are different. It is an object of the present invention to provide a sheet pressure adjusting device having a simple structure that can be uniformly adjusted.

[0008]

According to a first aspect of the present invention, there is provided a paper supply pressure adjusting device, comprising: a paper supply tray main body having a reference surface on one side for storing transfer papers of different sizes; A bottom plate on which a base end side is supported by the paper feed tray main body and on which the transfer paper is mounted; and a bottom plate slidably supported along the left and right direction by the paper feed tray main body and opposed to the reference surface. A side fence, and an end fence slidably supported in the front and rear direction by the paper feed tray body,
A pressurizing spring provided between the bottom plate and the paper feed tray main body, the pressurizing spring including a pair of pressurizing springs for pressing the bottom plate toward a corner claw for separating transfer paper; A feed pressure adjusting device that adjusts a pressing force of a spring according to a type of a transfer sheet, wherein one end is connected to the bottom plate and the other end is connected to a lever member near one of the pair of pressure springs. A connecting spring is provided, and the lever member is movably held on the paper feed tray main body side to move the spring in the expansion and contraction direction.

[0009] The sheet pressure adjusting device according to a second aspect is characterized in that the lever member is formed integrally with the side fence.

[0010] According to a third aspect of the present invention, in the paper feed pressure adjusting device, the lever member is formed integrally with the end fence.

When the spring force of the left and right pressure springs is adjusted to be constant with respect to transfer paper of a specific size, in the case of a paper feeder based on one-sided paper supply, if the size of the transfer paper is different, the pressure spring is used. The pressing force is different on the left and right. Therefore, when a spring disposed closer to one of the pair of pressurizing springs is expanded and contracted by a lever member, the pressing force of the pair of pressurizing springs is changed by the spring force of the spring, and the transfer paper is uniformly pressed. It becomes possible to be pressed. This lever member may hold a specific separate product movably on the paper feed tray main body, but this lever member is integrally formed on a side fence or end fence that moves according to the size of the transfer paper. Thus, it is possible to automatically adjust the pressing force of the pressing spring to be equalized according to the change of the transfer paper.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the paper feed pressure adjusting device according to the present invention will be described below in detail with reference to the drawings. 1 and 2 show a schematic structure of a sheet feeding device based on one-sided sheet feeding and a schematic structure of a sheet feeding pressure adjusting device according to the present invention applied thereto. The paper feed tray main body 10 having the grip portion 12 is formed of a frame-shaped member that forms a reference surface 13 on one side surface. A side fence 18 is slidably supported in the left-right direction on the sheet tray main body 10 at a position facing the reference surface 13. At the front end side of the reference surface 13 and the side fence 18, a corner claw 20 for holding the front end of the transfer paper 17 (FIG. 2) and separating the topmost transfer paper 17 from the others is provided.

An end fence 19 is slidably supported in the front and rear direction of the main body 10 at the rear end side of the main body 10. Also, the paper feed tray body 10
The bottom plate 9 is provided between the upper base end 13 and the side fence 18.
Is arranged. The bottom end of the bottom plate 9 is supported by a pin on the sheet tray main body 10.

A pair of pressure springs 14 are provided between the bottom surface 11 and the bottom plate 9 of the paper feed tray body 10. The pressure spring 14 presses the transfer paper 17 mounted on the bottom plate 9 toward the corner claw 20 as shown in FIG.

In this embodiment, the paper feed pressure adjusting device 1 comprises a spring 2 and a lever member 3. The spring 2 is made of a coil spring, and one end of the spring 2 is a bottom plate 9 as shown in FIG.
Fixed to On the other hand, the guide roller 4 is fixed to the lower surface of the bottom surface 11 of the paper feed tray body 10, and the wire 5 connected to the spring 2 passes through the bottom surface 11 and is guided by the guide roller 4 to be connected to the end of the lever member 3.

In this embodiment, the lever member 3 is formed of an L-shaped member, and is supported by the sheet tray main body 10 so as to be movable in the left-right direction. One end of the paper feed tray body 10 is disposed so as to protrude slightly from the gripping portion 12, and the other end thereof extends along the lower surface of the bottom surface 11 of the paper feed tray body 10 in the left-right direction and extends as described above. The part is connected to a wire 5 connected to the spring 2. A slit 6 is formed on the side of the paper feed tray main body 10 so that the lever member 3 can move in the left-right direction.

With the above structure, as shown in FIG. 3, when the lever member 3 is moved toward the reference surface 13 of the paper feed tray main body 10, the wire 5 moves in that direction, and the spring 2 is pulled. For this reason, a downward force acts on the bottom plate 9 and acts to reduce the pressing force of the pressure spring 14 against the bottom plate 9.

Therefore, if the pressing force of the pressure spring 14 is set to act evenly on the B paper 15 shown in FIG.
A small force acts on the pressurizing spring 14 on the side of the holding portion 12, and the transfer paper 17 on the bottom plate 9 inclines downward toward the reference surface 13 in the state as it is. To prevent this, it is necessary to reduce the pressing force of the pressing spring 14 on the grip 12 side. By pulling the spring 2 downward,
The pressing force of the pressure spring 14 decreases. Therefore, by adjusting the degree of tension of the spring 2, the upper surfaces of the bottom plate 9 and the transfer paper 17 can be made horizontal. Also,
This adjustment only needs to move the lever member 3, and the adjustment operation is easy.

The embodiment of the paper feed pressure adjusting device shown in FIGS. 1 to 3 is a case of the paper feed pressure adjusting device 1 provided with a separate lever member 3, but the paper feed pressure adjusting device shown in FIGS. Pressure adjusting device 1
“a” is provided with the lever member 3a integrally provided on the side fence 18. Other structures are the same as those described above, and a duplicate description will be omitted. By moving the side fence 18 as shown in FIG. 5, the spring 2 is pulled, and the pressing force of the pressure spring 14 can be equalized as described above.

In the paper feed pressure adjusting device 1b shown in FIG. 6, the wire 7 corresponding to the lever members 3 and 3a is connected to the end fence 19, and the wire 7 is connected to the wire 5 on the spring 2 side via the guide roller 8. Things. The movement of the end fence 19 can equalize the pressing force of the pressure spring 14.

The side fence 18 and the end fence 19
Is to adjust the movement each time the size of the transfer paper 17 is changed. By associating the amount of movement with the tensile force of the spring 2, the pressing force of the pressure spring 14 corresponding to the size of the transfer paper 17 is adjusted. The equalization can be set automatically.

In the present invention, the paper feed pressure adjusting device has a simple structure as described above, but the detailed structure is not limited to that described above. Also, the number is not limited to one.

[0023]

【The invention's effect】

1) According to the sheet feeding pressure adjusting device according to the first aspect of the present invention, the pressing force of the pressing spring pressing the transfer sheet can be adjusted by moving the lever member of the sheet feeding pressure adjusting device. The transfer paper can be pressed with an equal pressing force even if the size and the like of the transfer paper stored in the paper feed tray main body based on paper are different. Therefore, skew and the like are prevented, and smooth paper feeding is performed.

2) According to the sheet feeding pressure adjusting device according to the second aspect of the present invention, since the lever member is formed integrally with the side fence, the structure of the device can be made compact.
In addition, the pressing force acting on the transfer paper is equalized in synchronization with the change in the size of the transfer paper. This facilitates the adjustment of the sheet feeding pressure.

3) According to the sheet feeding pressure adjusting device according to the third aspect of the present invention, by forming the lever member integrally with the end fence, the same effect as in the case of the side fence can be obtained. .

[Brief description of the drawings]

FIG. 1 is a partial plan view showing a schematic structure of a paper feed pressure adjusting device according to the present invention and a paper feed device provided with the paper feed pressure reference.

FIG. 2 is a schematic view including a cross section taken along line AA of FIG. 1;

FIG. 3 is a schematic diagram for explaining the operation of the sheet pressure adjusting device shown in FIGS. 1 and 2;

FIG. 4 is a partial plan view showing the sheet feeding pressure adjusting device of the present invention in which a lever member is provided on a side fence.

FIG. 5 is a schematic view including a cross section taken along line BB of FIG. 4;

FIG. 6 is a partial plan view showing a sheet feeding pressure adjusting device of the present invention in which a lever member is provided on an end fence.

FIG. 7 is a plan view showing a schematic structure of a conventional sheet feeding device based on double-sided sheet feeding.

FIG. 8 is a partial side view showing a schematic structure around a bottom plate of a conventional paper feeding device and transfer paper mounted on the bottom plate.

FIG. 9 is a schematic diagram of a sheet feeding device based on both-side sheet feeding.

FIG. 10 is a schematic diagram of a sheet feeding device based on an inner sheet feeding.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper pressure adjusting device 1 a paper pressure adjusting device 1 b paper pressure adjusting device 2 spring 3 lever member 3 a lever member 4 guide roller 5 wire 6 slit 7 wire 8 guide roller 9 bottom plate 10 paper tray main body 11 bottom surface 12 gripping portion 13 Reference Surface 14 Pressure Spring 15 B Paper 16 A Paper 17 Transfer Paper 18 Side Fence 19 End Fence 20 Corner Claw

Claims (3)

[Claims] 1. A paper feed tray body having a reference surface on one side for storing transfer papers of different sizes, a bottom plate having a base end supported by a pin on the paper feed tray body and mounting the transfer paper thereon, A side fence slidably supported by the tray body along the left-right direction and disposed opposite to the reference surface;
An end fence slidably supported in the front and rear direction by the paper feed tray main body, and interposed between the bottom plate and the paper feed tray main body, and the bottom plate is placed on a corner claw side for separating transfer paper. A feed pressure adjusting device that adjusts the pressing force of the pressing spring in a one-sided feeding reference paper feeding device including a pair of pressing springs to press in accordance with the type of transfer paper, A spring for connecting one end to the bottom plate and connecting the other end to a lever member is provided near one of the springs, and the lever member can be moved to the paper feed tray body side to move the spring in the expansion and contraction direction. A sheet pressure adjusting device, wherein 2. The sheet feeding pressure adjusting device according to claim 1, wherein the lever member is formed integrally with the side fence. 3. The sheet feeding pressure adjusting device according to claim 1, wherein the lever member is formed integrally with the end fence.