JPS62149499A - Manufacture of barrel-shaped roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to drum-shaped rollers used in various electrical appliances.

Conventional Technology Conventionally, when paper or resin sheets are fed using rollers, the diameter of the rollers is almost uniform, and the paper or sheet may be fed diagonally or wrinkled, and in the case of rubber rollers in particular, the diameter of the rollers is almost uniform. The configuration was such that phenomena such as 9-piece feed were likely to occur. To solve this problem, it has conventionally been common to use drum-shaped rollers 1 and 2 shown in FIGS. 4 and 5.

The drum-shaped rollers 1 and 2 were formed by cutting or molding.

Problems to be Solved by the Invention However, manufacturing the drum-shaped roller 1 by cutting is very expensive, takes a lot of processing time, and is difficult to achieve precision.
In this case, the high mold cost and processing of the parting line 2a are factors that increase the cost.

Means to Solve the Problems In order to solve the above problems, the present invention covers a rod with multiple layers of heat shrinkable tubes of different lengths, makes the diameter of the roller drum-shaped, and applies heat at appropriate times. It is.

Operation According to the above configuration, a drum shape can be easily reproduced with relatively stable quality, and moreover, it can be supplied at low cost.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 10 is a pipe-shaped rod made of aluminum. Reference numeral 11 denotes a first heat-shrinkable tube, and this tube 11 is placed in the center of the rod 10 and is shrunk by applying heat.

In this case, hot water near 100°C is preferable. As a result, the diameter of the central portion 10' of the rod 1o becomes thicker by the length of the heat-shrinkable tube 11.

Furthermore, the second heat shrink tube 12 is inserted into the heat shrink tube 11.
Place it so as to cover it and apply heat to shrink it. At this stage, stick 1
The diameter of o is the original diameter 13, the first tube part 14, the second
There are three types of tube parts 16, and by adding or subdividing the third heat shrink tube 13 as shown in Figure 2, the cylindrical diameter can be gradually reduced from the center to both ends according to the request. A drum-shaped roller can be manufactured. In the above embodiment, the heat-shrinkable tube 12 is longer than the heat-shrinkable tube 11, but a tube that is shorter toward the outside as shown in FIG. 3 may be used. Note that in both FIGS. 2 and 3, the outer heat shrink tube is thicker than the inner tube.

Effects of the Invention - As shown in F, according to the present invention, when manufacturing a drum-shaped roller, it can be formed in a short time and at low cost, and it is also possible to easily change the diameter of parts other than the drum. It is something.

[Brief explanation of drawings]

FIG. 1 fan-(1) is a diagram showing the manufacturing process of one embodiment of the present invention, FIGS. 2 and 3 are sectional views of another embodiment of the present invention, and FIGS. 4 and 5 (al , fb) is a diagram showing a conventional example. 1o...rod, 11,12.13...heat shrink tube. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure: 53 Figure 4 Figure 5

Claims (1)

[Claims] A drum that applies heat in a timely manner by covering the rod-shaped or pipe-shaped rod with multiple heat-shrinkable tubes of different lengths so that the cylindrical diameter gradually decreases from the center to both ends. Manufacturing method for shaped rollers.