JPH0740649U - Paper separation mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] In a paper separating mechanism that separates one sheet of paper by a driving roller and a separating roller that is brought into contact with the driving roller with a predetermined torque applied thereto, without affecting the separating roller. Provided is a paper separating mechanism capable of applying the above torque. A sheet separating mechanism of the present invention comprises a sheet feeding roller 50 driven by a driving means, a shaft 30 arranged in parallel with the sheet feeding roller 50, and a support rotator rotatably inserted through the shaft 30. 21 and a separation roller 20 that is fixed to the support rotating body 21 and is driven to rotate by abutting against the outer peripheral surface of the sheet feeding roller 50, and frictionally slides on the support rotating body 21 to form the separation roller 20. Biasing member 25 for applying a rotational load
And.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet separating mechanism for separating a sheet fed out by driving a sending roller that abuts stacked sheets.

[0002]

[Prior art]

 Generally, a printer incorporates a paper feed cassette in which various papers are stacked and stored in the printer body. The stacked papers are separated one by one by a paper separating mechanism provided in the paper feed cassette, and then printed in a printing section. It is sent out toward. As such a sheet separating mechanism, various methods have been conventionally known. For example, in Japanese Utility Model Laid-Open No. 3-51731, a separating roller in which a predetermined torque is applied to a driven sheet feeding roller is known. There is disclosed a sheet separating mechanism which brings the sheets into contact with each other and separates one sheet between the sheet feeding roller and the separating roller.

This paper separation mechanism rotatably supports a separation roller that comes into contact with the outer surface of the paper feed roller on a fixed shaft, and applies a predetermined pressing force from one end surface of the separation roller with a compression spring to separate the separation roller. The roller is given a predetermined torque, that is, a rotational resistance force larger than the frictional force generated between the sheets. In this case, applying a predetermined torque to the separation roller is configured so that a plurality of friction plates are interposed on the outer surface of the separation roller so that the friction plates are pressed by a compression spring so that the environment is not affected. Has been done.

[0004]

[Problems to be solved by the device]

 However, according to the conventional paper separating mechanism, a plurality of friction plates are interposed on the outer surface of the separating roller, and the desired torque is obtained by press-contacting the friction plates with a compression spring. Strong spring pressure is required. Normally, the separation roller is made of a soft material such as rubber, so that when the outer surface is pressed with a strong compressive force, the separation roller is deformed so that the central region swells. As a result, a smooth separation surface cannot be obtained between the paper feed roller and the outer peripheral surface of the paper feed roller, which causes oblique feeding, non-feeding, and the like when the paper is separated and fed.

The present invention has been made in order to solve the above-mentioned problems, and in a sheet separating mechanism for separating one sheet by a sheet feeding roller and a separating roller which is brought into contact with the sheet by applying a predetermined torque thereto. It is an object of the present invention to provide a sheet separating mechanism that can apply the predetermined torque without affecting the separating roller.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the paper separating mechanism of the present invention comprises a paper feeding roller driven by a driving means, a shaft arranged in parallel with the paper feeding roller, and a support rotatably inserted through the shaft. A rotating body, a separating roller that is fixed to the supporting rotating body, and is driven to rotate by abutting against the outer peripheral surface of the paper feed roller, and a friction roller that slides on the supporting rotating body. And a load means for applying a rotation load.

[0007]

[Action]

 A separation roller, to which a predetermined torque is applied, is in contact with the outer peripheral surface of the rotationally driven paper feeding roller. The separating roller is fixed to a support rotating body that is rotatably supported by a fixed shaft, and is rotatable around the fixed shaft together with the support rotating body. A friction member is provided on the outer side surface of the support rotary body, and by applying a predetermined frictional force to the friction member, the predetermined torque is applied to the separation roller that rotates integrally with the support rotary body. .

[0008]

【Example】

 Hereinafter, an embodiment of the sheet separating mechanism according to the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a side view showing a schematic portion of a sheet feeding device in which the sheet separating mechanism of the present invention is used.

Laminated sheets are placed on the sheet placing plate 3, and the lower surface on the front end side of the laminated sheets is brought into contact with the outer peripheral surface of the feeding roller 5 driven by a driving unit (not shown). Has been. A weight roller is in contact with the upper surface of the laminated sheet, and presses and urges the laminated sheet toward the delivery roller 5. By driving the feeding roller 5 in the direction of the arrow, the stacked sheets are sequentially fed out from the lower surface side and guided to the sheet separating mechanism through the gap formed between the sheet stopper 8 and the guide 9. . The sheet separating mechanism 10 is supported by the frame 12 and the supporting member 15, and is provided with a separation roller 20 to which a predetermined torque is applied and a sheet feeding roller 50 that is driven by a drive source (not shown) to follow the separation roller 20. And are equipped with.

FIG. 2 is a front view showing the configuration of the paper separating mechanism in the paper feeding device shown in FIG. 1, and FIG. 3 is an exploded perspective view of the separating roller portion of the paper separating mechanism shown in FIG. is there. The configuration of the sheet separating mechanism will be described below with reference to these drawings.

A shaft 30 having a D-shaped cross section is arranged so as to be parallel to the paper feed roller 50 fixed to the drive shaft 51. The shaft 30 is fitted and held by fitting portions 16a formed on both extending portions 16 of the U-shaped support member 15. The support member 15 is arranged so as to slide on both extending portions 13 of the U-shaped frame 12 which is slightly larger than this. A projecting member 14 extending downward is provided at the center of the frame 12, and the projecting member 14 has a biasing member 18 interposed in a hole 17 formed in the center of the supporting member 15. Is inserted. Grooves 13a are formed in both extending portions 13 of the frame 12 along the extending direction, and both ends of the shaft 30 held by the fitting portion 16a of the supporting member 15 protrude from the groove 13a. The shaft 30 is stopped by the groove 13a.

A support rotating body 21 is provided on the shaft 30 so as to be rotatable with respect to the shaft 30, and a separation roller 20 is fixed to an outer peripheral surface of the support rotating body 21. Thus, the separation roller 20 held by the support member 15 is urged against the outer peripheral surface of the sheet feeding roller 50 by a predetermined pressing force by the urging member 18 arranged between the separation roller 20 and the frame 12. The support rotary body 21 is made of a material, such as a resin, which does not deform even when an axial force is applied.

Friction members 22 are fixed to both outer side surfaces of the support rotary body 21, and washers 24 are formed on the outer sides of the friction members 22 to form D holes and prevent rotation around the shaft 30. Or the friction member 22 is fixedly arranged on the washer 24. One end side of the biasing member 25 is arranged on the outer side of one of the washers, and the other end side of the biasing means 25 is fixed by a fixing member 28a via a washer 27 having the same structure. On the other hand, a fixing member 28b is arranged on the outer side of the other washer to prevent the support rotating body 21 urged by the urging member 25 from moving in the axial direction.

As a result, a load is applied to the friction member 22 fixed to the support rotary body 21 by the urging force of the urging member 25, and the friction member 22 is fixed to the support rotary body 21 and the outer peripheral surface of the paper feed roller 50. A constant braking force is applied to the separation roller 20 that is abutted and urged against. In this case, a constant braking force is such that when the paper passes between the paper feed roller 50 and the separation roller 20, the frictional force between the paper and the paper feed roller 50> the braking force applied to the separation roller 20> the paper. The frictional force between the paper and the paper is set.

Since the braking force applied to the separation roller 20 is applied by the urging member 25 via the friction member 22 fixed to the support rotary body 21, the separation roller 20 made of a relatively soft material has The axial biasing force from the biasing member 25 is not directly applied. Therefore, the separation roller 20 is not deformed by the urging force of the urging member 25. Further, as described above, since the supporting rotary body 21 to which the biasing force is applied is made of a material that is hard to be deformed, the supporting rotary body 21 is not deformed to affect the separation roller.

FIG. 4 shows a state in which the sheets are conveyed by the sheet separating mechanism, and FIG. 5 shows a state in which the double-fed sheets are separated into one sheet. As shown in FIG. 4, when only one sheet of laminated paper is conveyed by the delivery roller 5, the separation roller is caused by the relationship of frictional force between the paper and the paper feed roller 50> braking force applied to the separation roller 20. 20 is driven. As a result, the sheet separated into one sheet passes as it is between the separation roller 20 and the sheet feeding roller 50 and is conveyed. Further, as shown in FIG. 5, when two sheets of laminated paper are conveyed by the sending roller 5, the separation roller 20 separates due to the relationship of braking force applied to the separation roller 20> friction force between the paper sheets. The roller 20 stops. As a result, the multi-fed sheets are separated into one sheet between the separation roller 20 and the sheet feeding roller 50 and conveyed.

The present invention is characterized in that, when a certain braking force is applied to the separating roller, the separating roller is fixed to the supporting rotating body and a load is applied to the supporting rotating body. For example, it is also possible to configure as described below.

FIG. 6 and FIG. 7 show another embodiment of the paper separating mechanism of the present invention, which is a view showing the structure of the separating roller. The parts other than the structure shown in the drawing have the same structure as that of the above-described embodiment and are omitted. Further, the same constituent elements as those in the above-described embodiment are designated by the same reference numerals. According to this embodiment, on both outer side surfaces of the support rotary body 41 rotatably provided on the shaft 30 and to which the separation roller 20 is fixed, a groove shape is formed radially from the center so that a predetermined frictional force is generated. Engaging surface 41a is formed. On the other hand, a washer 24a having a corresponding engaging surface 24b is engaged with the engaging surface 41a. Then, by pressing one of the washers with the biasing member 25, a predetermined pressing force similar to that in the above-described embodiment is applied to the supporting rotary body. In this way, if the friction surface is formed on the outer side surface and the washer of the support rotary body, it is not necessary to provide the friction member as in the above-described embodiment, and the number of parts can be reduced. Further, the paper separating mechanism of the present invention can be applied to various types of paper feeding devices regardless of the paper feeding device shown in the figure.

[0019]

[Effect of device]

 As described above, according to the paper separating mechanism of the present invention, the supporting rotating body made of the non-deformable material is pressed to exert the urging force to apply the load to the separating roller. It is possible to prevent deformation of the roller. As a result, the separation surface from the paper feed roller can be held smooth, and stable separation and feeding of paper becomes possible. Further, since the separation roller is fixed to the supporting rotary member, the material of the separation roller can be adjusted depending on the paper quality.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic part of a sheet feeding device in which a sheet separating mechanism of the present invention is used.

FIG. 2 is a front view showing the configuration of a paper separating mechanism in the paper feeding device shown in FIG.

3 is an exploded perspective view of the sheet separating mechanism shown in FIG.

FIG. 4 is a diagram showing a state where a sheet is conveyed by a sheet separating mechanism.

FIG. 5 is a diagram showing a state in which a multi-fed sheet is separated into one sheet.

FIG. 6 is a view showing another embodiment of the paper separating mechanism, and an exploded perspective view showing the structure of the separating roller.

7 is a plan view of the separation roller shown in FIG.

[Explanation of symbols]

10 ... Paper separation mechanism, 20 ... Separation roller 21, 41 ...
Support rotating body, 25 ... biasing member, 30 ... shaft, 50 ... paper feed roller.

Claims (1)

[Scope of utility model registration request] 1. A paper feeding roller driven by a driving means, a shaft arranged in parallel with the paper feeding roller, a support rotary member rotatably inserted through the shaft, and fixed to the support rotary member. And a separation roller that is driven to rotate by abutting and biasing the outer peripheral surface of the sheet feeding roller, and a load unit that applies a rotational load to the separation roller by frictionally sliding on the support rotating body. A paper separation mechanism characterized in that