JPH0213533A - Conveyance roller of paper feed device - Google Patents

Abstract

PURPOSE:To obtain the cheep and reliable conveyance roller of a paper feed device with a simple structure requiring no bush by applying a friction material on the outer circumferential surface of a core material in a roller shape made of a dry lubricating material. CONSTITUTION:A conveyance roller 21 composed of a core material 22 and a friction member 23 is supported rotatably on a shaft 31 through a stopper ring 32 and energized toward a drive roller 34 side by sheet springs 33 mounted on the shaft 31. A paper sheet 35 conveyed in C direction by a paper feed mechanism is taken in a gap between the conveyance roller 21 and the drive roller 34 and fed to a prescribed paper feed destination. In this case, the paper sheet 35 is fed by a strong paper feed force due to its contact with the friction member 23 of the conveyance roller 21 between the conveyance roller 21 and the drive roller 34. When the conveyance roller 21 is rotating, the shaft 31 is not raced because the core material 22 of the conveyance roller 21 is made of the dry lubricating material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a conveying roller of a paper feeding device used in, for example, a character reading device.

(Prior Art) Conventionally, as shown in Fig. 3, a roller-shaped conveyance roller of a paper feeding device used in a character reading device, etc., is made of a rigid side material such as aluminum, brass, or iron. A friction material 12 such as urethane or butyl rubber is baked on the outer peripheral surface of the core material 11, and bushes 13a and 3b made of a dry lubricant material such as Delrin or Teflon are used as bearings at both ends of the core material j1. It is known that it was press-fitted.

In such a configuration, since the core material 11 is conventionally made of a rigid material, there is a problem in that it causes idle rotation when a shaft (not shown) is inserted therein. Therefore, in order to prevent such idle rotation of the shaft, bushings i3a and 13b made of dry lubricating material are used as bearings. However, when the conveyance roller is constructed using such bushes 13a and 1.3b, there are drawbacks as described below.

That is, bushings 13 are provided as bearings at both ends of the core material]1.
a, 13b, Bush 13a11
3b to the core material 11, the shapes of the bushes i3a and 13b are complicated. Therefore, there is a drawback that manufacturing the bushings 1.3a and 1.3b requires time and cost. Also, such a bush 1.3a
, 13b, the shape of the core material 11 becomes complicated, so the manufacturing of the core material 11 also takes time and cost.

In this case, since the conventional core material 11 is made of a rigid material such as aluminum, brass, or iron, the bushing 13a,
There is a drawback that it is difficult to process as a roller including the shape for 13b.

Furthermore, it is difficult to press-fit the bushes 13a, i3b, and even when the bushes 13a, 13b are press-fitted, heat and repeated loads during roller operation may cause the bushes 13a, 13b to
There is a drawback that B cannot be overtaken.

(Problems to be Solved by the Invention) As described above, conventionally, since the conveyance roller was constructed using a core material made of rigid side materials, a bushing was required as a bearing. As a result, the structure becomes complicated, the manufacturing time and cost increase, and the reliability is low.

The present invention has been made in view of the above points, and an object of the present invention is to provide a conveyance roller for a paper feeding device that does not require a bushing, has a simple structure, is inexpensive, and has high reliability.

[Configuration of the Invention (Means for Solving the Problems) That is, the conveying roller of the paper feeding device according to the present invention is formed by applying a friction material to the outer peripheral surface of a roller-shaped core material made of a dry lubricant material. It is characterized by

(Function) According to the above structure, since the core material is made of a dry lubricant material, it is easy to apply and when formed into a roller shape, no bushing is required as a support.

Therefore, by eliminating the bushing, it is possible to construct a conveying roller with a simple structure, low cost, and high reliability.

(Example) Hereinafter, a conveyance roller of a paper feeding device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing its structure, and this conveying roller 21 is composed of a roller-shaped core material 22 and a friction portion 23 provided on the outer peripheral surface of the concentric material 22. As shown in FIG. The core material 22 is made of a dry lubricant material such as Delrin or Teflon, and is formed into a roller shape by being filled into a roller mold. Further, the friction member 23 is made of, for example, urethane or butyl rubber, and is baked onto the outer peripheral surface of the core material 22.

In such a configuration, since the core material 22 is made of a dry lubricant material, it is easy to process and can be easily formed into a roller shape by being filled into a mold. In this case, it is difficult to process a conventional core material made of a rigid material, so it is difficult to fit it into a mold and form a roller. Moreover, since the core material 22 is a dry lubricating material, when the shaft 31 is inserted therein, as shown in FIG. 2, the shaft 31 will not spin idle. Therefore, there is no need for a bush as a bearing as in the past, which allows the conveying roller 21 to be constructed with a simple structure and at low cost.Furthermore, there is no need to worry about the bush coming off, so high reliability can be achieved. be able to.

FIG. 2 is a perspective view showing the structure of a paper feeding device using the conveyance roller 21. The conveyance roller 21, which is made up of a core material 22 and a friction section 23, is rotatable through a retaining ring 32 on a shirt I/31. The drive roller 34 is supported by a leaf spring 33 attached to the shaft 31. This drive roller 34 is rotated in the direction of arrow A by a drive source (not shown). Due to the rotational drive of this driving roller 34, the conveying roller 2] which is in pressure contact with the driving roller 34 is
Rotate in the direction of arrow B.

In such a configuration, the paper 35 transported in the direction of arrow C by a paper feeding mechanism (not shown) is taken between the transport roller 21 and the drive roller 34, and is fed by a predetermined paper feeding light. become. In this case, the paper 35 is
The friction member 2 of the conveying roller 21 between the drive roller 34 and the
3, the paper is fed with strong paper feeding force. Further, when the conveyance roller 21 is in a rotating state, the conveyance roller 21
Since the core material 22 of 1 is made of dry lubricant material,
31 will not be idle.

[Effects of the Invention] As described above, according to the present invention, since the friction material is applied to the outer peripheral surface of the roller-shaped core material made of a dry lubricant material, a bushing is not required, and the structure is simple, inexpensive, and A highly reliable conveyance roller for a paper feeding device can be realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a conveyance roller according to an embodiment of the present invention, FIG. 2 is a perspective view showing the configuration of a paper feeding device using the conveyance roller of the same embodiment, and FIG. FIG. 3 is an exploded perspective view showing the configuration of a conveyance roller. 21... Conveyance roller, 22... Core, 23... Friction system, 31... Shaft, 32... Retaining ring, 33...
- Leaf spring, 34... Drive roller, 35... Paper. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A conveyance roller for a paper feeding device, characterized in that it is formed by applying a friction material to the outer peripheral surface of a roller-shaped core material made of a dry lubricant material.