JPS60143242A - Wide timing belt - Google Patents

Abstract

PURPOSE:To increase fracture strength at joint parts of timing belts by shifting the joint parts of the respective timing belts and increasing the number of non- cut core lines at respective joint parts. CONSTITUTION:Timing belts 5, 5' each having many core lines 3, 3' buried in the longitudinal direction thereof are joinned in their longitudinal side surface parts 4, 4' with each other such that both end joint parts 6, 6' thereof are never overlapped. Hereby, the number of the non-cut core lines 3, 3' at said joint parts 6, 6' of both ends of the timing belts 5, 5' are increased, allowing fracture strength at these parts to be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wide timing belt. More specifically, the present invention relates to a wide timing belt with increased breaking strength at joints.

The timing belt, which has a large number of core wires buried in the entire longitudinal direction, is thermally fused at the cut surface 1 where the U-shaped shapes are combined, as shown in the partial plan view of the joint in Figure 1 of the drawings. Since the total extension length at the joint surface is relatively long, the total joint area multiplied by the thickness becomes large, and as a result, it seems at first glance that the breaking strength of the joint is large. However, what determines the breaking strength of a joint is the number of uncut core wires rather than the total joint area, and in the case of Figure 1, there are 16 core wires at both ends a and b of the joint. In both cases, half of the core wires are cut, and only the remaining half of the core wires, which are 8 core wires, are uncut, so the breaking strength at both sides of these joints is % of the other parts.

Endless belt cable using this type of joining method
9-93755, in which a more complicated combination of U-shaped shapes is used to form a joint at both ends, but this method not only inherently has the disadvantages described above, but also has the following disadvantages: There is also the drawback that when manufacturing a wide timing belt, there are major restrictions on its ll'l+l. In other words, it is possible to form complex joints.
The price is a stamping die for both ends of C size, and the current maximum width of the die is 101.4 mm.
nun T: Yes, there is a problem that we cannot manufacture something wider than this.

The present invention increases the fracture strength of the joint, and also increases the ilJ
It is an object of the present invention to provide a timing belt tracker capable of forming a wide endless belt. Therefore, the present invention relates to a wide timing belt, and the wide timing belt occupies a longitudinal side surface portion of the timing belt in which a large number of core wires are embedded in the longitudinal direction, at a position where the joints at both ends of each timing belt do not overlap at all. The structure is such that they can be joined at different angles.

FIG. 2 of the drawings shows a partial plan view of one embodiment of the wide timing belt according to the present invention. In this wide timing heald, the timing belt has a large number of cores ga, 3' buried in the longitudinal direction side parts 4, 4.
' are joined, thereby forming a wide belt, with both end joints 6, 5' of each timing belt 5.5'
6' occupy positions that do not overlap at all, that is, when an endless belt is formed, both end joints (6, 6') are located at positions that are never on the same axis when viewed from the circumferential direction of each unit belt. Shift it so that it occupies the entire area and join it.

In the case shown in the diagram (ke), only 4 core wires out of 16 core wires have been cut at both end portions c, d, θ, and f of each joint, and the remaining Since the 12 core wires are not cut, the breaking strength of those parts is the same as that of the other ilJ1, and the breaking strength of each joint at both ends is 1.5 times that of the embodiment shown in Fig. 1. In addition, since it is possible to join a number of longitudinal side parts of each timing belt in this way,
It is possible to manufacture a wide timing belt with increased breaking strength at the joint. In addition, it depends on the distance (between 6 and 0) Id between both ends of each joint and +p*K of the unit timing belt, but generally it is about 200I! It is preferable to join them with a shift of In1 or more.

The joining is performed both at both ends of each timing belt and at the longitudinal side, but these may be done at the same time, or after the both ends are joined, the longitudinal side is joined 4. There may be as many rows 'f,j.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view of the prior art and FIG. 2 is a partial plan view showing all the timing belt joints of the present invention. (Explanation of symbols) 1.6...Both prefecture joint part 2.3...Core wire 4...Longitudinal direction 1111 surface part 5...・・・・・・・・・・・・M-rank timing belt agent patent attorney Yoshi 1) Toshio

Claims (1)

[Claims] 1. A timing belt in which the longitudinal side surfaces of a large number of timing belts in which SHs are embedded in the longitudinal direction are joined to each other in such a way that the joints at both ends of each timing belt occupy positions that do not overlap with each other at all.