JP3022119U - Outer diameter variable roller for transportation - Google Patents

Abstract

(57) [Summary] A conveyance roller capable of varying the outer diameter of the conveyance roller to change the conveyance force of a sheet and reducing frictional force and pressure force of various sheets and rollers. SOLUTION: A roller core metal is used as a cavity so that gas or liquid can be press-fitted therein, a hole is formed in a circumferential surface of the core metal, and a through hole is formed in an inner elastic layer attached to the core metal, and an outer surface The thin cover was partially expanded so that the outer diameter could be changed.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is a feeding roller used for a copying machine, a facsimile, a printer or the like for feeding and discharging paper.

[0002]

[Prior art]

 In most conventional rollers, elastic rubber is attached around the core metal. Therefore, if the friction coefficient and pressure bonding force are reduced due to the adhered substances on the surface or abrasion, the paper will not be conveyed. Conversely, if the friction coefficient becomes too large, the paper will be wound around the rollers or pressed. Problems such as double feeding due to increased force occur. Therefore, in order to avoid such problems, it is necessary to use special paper for each device or to set a limit on the usable paper.

[0003]

[Means for Solving the Problems]

 Therefore, in the present invention, a hollow cylindrical shaft is used as the core bar, a through hole is formed in the core bar and an elastic body to be mounted on the peripheral surface, and the outer side is covered with a thin elastic body.

A gas such as air or a liquid such as water is press-fitted into the core metal, and the pressure of the gas or liquid expands the position corresponding to each through hole of the cover, and the position is partially expanded. By increasing the outer diameter, it is possible to increase the adhesive strength with the paper. By adjusting the pressure input of this gas or liquid, the outer diameter of the roller can be variously changed and the conveyance force and pressure force suitable for the paper can be created.

[0005]

[Embodiment of device]

 In the present invention, as shown in FIG. 3, holes 3 are formed at appropriate intervals in the circumferential direction of the core metal 1 made of a hollow cylindrical shaft and in the axial direction of arrow B and in the axial direction of arrow B. An inner elastic layer 4 having a through hole 6 formed in a radial direction is attached to the outside of the core metal 1, and the hole 3 of the core metal 1 and the through hole 6 of the inner elastic layer 4 are configured to coincide with each other. is there. Further, a thin elastic cover 5 covers the outside.

By pressurizing a gas or a liquid through the inlet 7 at the end of the cored bar, the gas or the like flows out of the cavity 3 of the cored bar 1 through its hole 3 and the through hole 6 of the inner elastic layer 4. The outer diameter of the outer surface of the through hole 6 of the cover 5 on the outer surface is expanded to increase the outer diameter of the entire portion in the circumferential direction. By adjusting the press-fitting strength of the gas or the like, it is possible to create outer diameters of various sizes, and it is possible to change the sheet conveying force.

[0007]

【Example】

 Next, an explanation will be given according to the embodiment shown in the drawing.

The roller core 1 has a hollow cylindrical shaft having an outer diameter of 13 mm and an inner diameter of 10 mm, and eight ventilation holes 3 having a hole diameter of 3 mm in the circumferential direction, which are provided in the circumferential direction at appropriate intervals. The inner elastic layer 4 made of silicone with a thickness of 3 mm and a hardness of 70 ° is attached to the outside, and the outer surface is covered with an elastic cover 5 made of silicone with a thickness of 0.5 mm and a hardness of 20 °. Covered the lap.

Air is press-fitted into the cavity portion 2 of the roller inner core metal 1 having the above-mentioned configuration, and the change of the air pressure and the change of the outer diameter of the roller and the carrying force for plain paper are measured to obtain the following results. It was As described above, the change in the outer diameter has increased the sheet conveying force.

[0010]

[Effect of device]

 According to the present invention, by pressurizing gas or liquid into the cavity of the cored bar, the outer diameter can be partially increased over the entire circumference, and the pressure force with the paper can be moderately increased to enhance the transport force. As a result, it is possible to convey the roller having a reduced conveying force, and by partially enlarging the outer diameter, the contact area with the paper can be reduced, and the paper can be prevented from being rolled up.

Further, by changing the outer diameter, it is possible to obtain a conveying force and a pressure-bonding force suitable for the sheet, so that it is possible to prevent the sheet from being unconveyed or double-fed.

[Brief description of drawings]

FIG. 1 is a sectional view

[Fig. 2] Cross-sectional view at the time of press-fitting air

FIG. 3 is a perspective view of a cored bar

[Explanation of symbols]

 1 core metal 2 cavity part 3 hole 4 inner elastic layer 5 cover 6 through hole 7 inlet

Claims (1)

[Scope of utility model registration request] 1. A core metal of a conveying roller is a hollow cylindrical shaft, and air holes are formed on its peripheral surface at appropriate intervals in the circumferential direction and in the direction parallel to the axis, and the outside of the core metal. Has an inner elastic layer in which a through hole corresponding to the air hole is provided in the radial direction, and the outer surface of the inner elastic layer is covered with an elastic cover. A variable outer diameter roller for conveyance in which the cover surface corresponding to the through hole opening of the elastic layer expands so that the outer diameter can be partially changed.