JPH0126920Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to an apron belt or a stretchable flat belt used for conveyance or power transmission in copying machines, tape recorders, stereos, etc. (Prior technology) Belts that are used in places where the shaft is fixed and where slipping is extremely difficult require elasticity.
Conventionally, coreless or cored belts made of urethane or rubber, etc., have been mainly used, but coreless belts have the disadvantage of short service life because the belt elongates and slips over time. On the other hand, cored belts have problems in tension setting during installation because they are difficult to stretch. Moreover, this type of thin cored flat belt manufactured by bag weaving is limited in size and has the disadvantage of having to be produced in a wide variety of varieties. (Problems to be solved by the invention) In view of the above-mentioned actual situation, the present invention aims to solve the above-mentioned difficulties by giving elasticity to the structure of the core and increasing the belt life. This is the purpose. (Means for Solving the Problems) That is, the present invention is characterized in that, in the structure of a flat belt in which a core body including a tensile body is embedded in an elastic body as shown in FIG. The point is that a yarn containing yarn and subjected to shrinkage processing is used as the tensile body 1 of the core body. Here, the elastic yarn is a crimped yarn of thermoplastic synthetic fiber such as nylon or polyester;
Included are rubber threads, polyurethane elastic threads, and threads obtained by mixing or twisting ordinary threads with rubber threads or polyurethane elastic threads. When manufacturing the belt, the tensile body containing the elastic thread is first wound around an elastic mandrel, and then the mandrel is reduced to shrink the elastic thread, and then an adhesive, rubber or polyurethane is applied. to produce a cylindrical core part. Thereafter, the above-mentioned core portion is used as a core, and the upper and lower sides are covered with elastic bodies existing in a normal belt structure, and the belt is cut into rings to form an endless flat belt. Note that the adhesive for the core may be applied to the tensile member during stretching of the mandrel. (Embodiments) Hereinafter, embodiments of the present invention will be described further based on the accompanying drawings. FIG. 1 shows an example of the flat belt of the present invention. In the figure, 1 is a tensile member, 2 is an adhesive layer, and they together form a core c, and 3 and 3' are upper and lower elastic members. The elastic bodies 3 and 3' are made of NR (natural rubber), SBR (styrene-butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), IIR (butyl rubber), and Hypalon (chlorsulfon), as in conventional belts. It is made of a single material such as polyethylene, or a resin material such as rubber or polyurethane, which is an appropriate blend of these materials. Further, the adhesive layer 2 is made of rubber or urethane. Therefore, in the structural example shown above, the tensile body 1 constitutes a main part of the present invention, and is made of thermoplastic synthetic fiber crimped yarn, thread rubber, polyurethane elastic thread, thread rubber or polyurethane elastic thread mixed with normal thread or twisted. It is constructed by using appropriately elastic thread selected from wound threads. In the following, a specific structural example of a flat belt having the above structure and belt performance based on this will be described. First, a belt core c is processed using the combinations shown in the following table, and then elastic bodies are attached to both the top and bottom sides, heated under pressure, and then cut into rings of a predetermined width to produce an endless flat belt. Samples No. 1 to No. 4 were created. However, in the table, polyurethane elastic thread is 100% to 200%
% stretched and twisted.

[Table] Next, the tensile and elongation properties of each of the above samples No. 1 to No. 4 were compared with those of the conventional coreless belt, and the results are shown in Figure 2. was found to be significantly superior. Furthermore, the tensile elongation characteristics of the present invention can be freely changed depending on the thickness of the core yarn, the winding density on the mandrel, and the shrinkage rate of the mandrel. In addition, the thing of this invention was based on the average value of No.1-No.4. In addition to the above tests, a driving test was also conducted. The running test was conducted with a running belt 100 mm long, 5 mm wide, and 0.5 mm thick between the 10 mm Φ drive pulley and the running pulley with a belt elongation rate of 5%. The results showed that the coreless belt lost tension after 720 hours and could not be used, whereas the belts of the present invention did not cause any problems even after running for 1000 hours. (Effects of the invention) As described above, the flat belt of the present invention has elasticity as a tensile material of the flat belt core, and since it uses shrink-treated thread, it can be used with elastic materials such as rubber or polyurethane. It also has the advantage that it can be expanded and contracted, and by molding with an expandable mandrel, a belt of any size can be easily obtained. Moreover, since it has a core containing a tensile material, it does not lose tension like a coreless belt, and the belt life improves as the running time increases.It also exhibits remarkable tensile elongation properties, making it superior to conventional belts. It can greatly improve the shortcomings of flat belts and increase their practical value.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the structure of the flat belt of the present invention, and FIG. 2 is a chart showing the tensile elongation characteristics. 1... Tensile body, 2... Adhesive layer, Core body c, 3...
Elastic body.

Claims (1)

[Claims for Utility Model Registration] 1. A flat belt in which a core body containing a tensile body is embedded in an elastic body, wherein the tensile body of the core body contains an elastic yarn and is made of a shrink-treated yarn. An elastic flat belt characterized by: 2. The elastic yarn is one or more types of yarn selected from the group consisting of thermoplastic synthetic fiber crimped yarn, rubber thread, polyurethane elastic yarn, rubber thread, or yarn in which normal yarn is mixed or wound around polyurethane elastic yarn. An elastic flat belt according to claim 1 of a certain utility model registration.