JPS63285348A - Connecting structure of timing belt - Google Patents

Abstract

PURPOSE:To enable manufacture of a belt having along circumference by connecting to each other end portions, one of which is formed in a recess and the other is in a protrusion viewing from one direction in such a condition that respective crest portions and the groove portions on the surfaces of both belt strips match each other, and connecting those belt strips to each other at said groove portions with a connecting tool. CONSTITUTION:One end 1a of a timing belt 1 is cut in a flat V-letter like recess 11, and the other end 1b is cut in an acute angle like protrusion 12 to be nearly fitted in the recess 11. At this time, they are cut in such a condition that each groove portion 13 and crest portion 14 of each of end portions 1a, 1b match each other. Next, the recess 11 and the protrusion 12 abut to each other in such a condition that crest portion 14 and groove portion 13 match each other, and belt strips are connected to each other at the groove portions 13 which match each other via a large number of chip-like connecting pieces 2 which are made of thin metal plates shaped in a gate-type and have almost the same inner width W as the width W of the timing belt 1.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a timing belt connection structure, and particularly to a connection structure suitable for connecting long timing belts in an endless manner.

``Prior Art'' The conventional timing belt connection structure is as shown in FIG. Apply a wide joint plate a and a flat joint plate of the same width as joint plate a on the other side, tighten both sides of both joint plates a and 1) with screws C, and tighten both joint plates a and b. It was designed to sandwich both ends of the timing belt.

Conventionally, endless timing belts are manufactured by creating a long mold with a gear-shaped cross section and an outer diameter that matches the length of the timing belt.The outer surface of this mold is coated with a rubber layer, a glass fiber calendar, and a rubber layer. After the rubber layer has hardened, the mold is removed to form a cylindrical timing belt material, which is then cut to a certain width.

"Problems to be Solved by the Invention" With the connection structure as shown in FIG. Moreover, since conventional endless timing belts are manufactured using the method described above, in order to manufacture an endless timing belt with a long circumference, a mold with a large diameter is required. Because it is necessary to create a belt, it is extremely expensive, and currently there are no timing belts with a circumference of 3 m or more on the market.Furthermore, conventional integral endless timing belts are only available in a limited number of circumference types. In fact, when used in a device, it is necessary to use an idler etc. to adjust the circumferential length, which makes the device expensive, and if the distance for torque transmission is long, multiple pairs are required due to the use of several endless timing belts. Since this requires the use of a pulley, there are also problems in this respect, such as the equipment becoming expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a connection structure suitable for connecting one timing belt in an endless manner.

In order to solve the above-mentioned problems, the connection structure according to the present invention has the following features:
One end of the timing belt is formed to have at least one concave shape when viewed from one side, and the other end is formed to have a convex shape that almost matches the concave shape, and the concave portion and the convex portion are formed in the ridges on the surface of the belt. In accordance with the state in which the and grooves match, a configuration is adopted in which a clip-shaped, staple-shaped or other connector is used to connect the grooves of the mating portions.

"Function" The shape of the connecting part is such that one end of the timing belt is concave and the other is convex, so they can be connected using a connecting tool such as a clip or staple made of a thin metal plate in the grooves that match each other. In this case, the tensile force acts almost perpendicularly on each coupling member to obtain a strong M connection, and the timing belt can rotate continuously in a fixed direction between a pair of pulleys. form.

"Example" Figures 1 to 4 show one embodiment of the timing belt 1, in which one end 1a of the timing belt 1 to be connected is cut into a concave shape 11 having a V-shape in plan, and the other end The portion 1b is cut into an acute-angled convex portion 12 that approximately matches the concave shape. At this time, the grooves 13 and peaks 14 of each end 1a, lb are cut to match.

Next, the concave shape 11 and the convex shape 12 are adjusted to their respective peaks]
4 and the groove part 13 are matched with each other, and the part of the groove part 13 that matches each other has an inner width W that is almost the same as the radius W of the timing belt l, and is made of a thin metal plate formed in a gate shape. They are connected by being sandwiched between a large number of clip-shaped connecting pieces 2.

Both ends 1 of the timing belt 1 are connected using clip-shaped connecting pieces 2.
To sandwich a and lb, use a suitable tool to bend the legs 21 and 21 of the connecting piece 2 in opposite directions as shown in FIG. 4, and overlap their ends. Trough 1 at the connection part
3, it is desirable to shave off the bottom of the connecting piece 2 by an amount equal to the thickness of the connecting piece 2, as shown in FIG.

The number of grooves 13 and peaks 14 spanning the connecting portion is set depending on the circumferential length and width W of the timing belt l.
The width W is 2 cm, the circumference is about 4 m, and around 10 pieces is a rough guideline.

The connecting pieces 2 may be separated, or the leg 21 may be connected with a thin plate 22 made of thin rubber or synthetic resin as shown in FIG. 1, or the tip of the leg 2I may be It is convenient to integrally form each connecting piece 2 in a state in which they are continuous with each other, and the connecting piece 2 and the timing belt l are bonded together using an adhesive if necessary. If an adhesive is used and the connecting portion does not require much strength, the connecting piece 2 may be made of synthetic resin.

Further, it is desirable that the width W' of the clip-shaped connecting piece 2 is approximately the same as the width W' of the groove 13 of the timing belt 1.

According to the connection structure of the above embodiment, the mating portions at both ends 1a and lb of the timing belt l are formed into a concave shape 11 when viewed from one side, and the other is formed into a concave shape 11 when viewed from one side.
Since the convex shape 12 is formed into a convex shape 12 that almost conforms to the shape of the convex shape 12, and the convex shape 12 is inserted into the concave shape 11, the tensile force on the connecting piece 2 acts almost at right angles, resulting in a strong connected state with high tensile strength. Therefore, no deviation occurs in the diagonal direction at the connecting part.

Moreover, with this connection structure, an endless timing belt of any length can be easily obtained, and an endless timing belt with a long circumference can be manufactured at extremely low cost.

In order to cut the end of the timing belt 1 into a concave or convex shape as described above, it is convenient to use a cutter as illustrated in FIG. 7.

In the cutter shown in FIG. 7, a fixed base 3 with a smooth upper surface is fixed in an erected state between a pair of guide columns 4, 4, for example, with an appropriate number of screws 41, and the upper surface of the fixed base 3 is shaped like a figure 7 in the longitudinal direction. A deep receiving groove 31 (even a 7-shaped recess) is formed in the guide portion 42 formed on the opposite surface of the guide column 4.4.
A movable base 5 is provided that slides along.

A V-shaped cut blade 51 is fixed to the lower surface of the movable base 5 in a state that it projects into the receiving groove 31, and the guide column 4.
The end of the timing belt (not shown) is inserted through the insertion opening 43 formed on the back surface of the timing belt, the movable base 5 is pressed against the fixed base 3, and the timing belt is cut by force-cutting with the cutting blade 51 and the receiver 31. At this time, each end may be cut separately to match the acute end of the receiving groove 31, which is the reference part for cutting, or both ends of the timing belt may be stacked so that the groove and the peak fit into each other. The overlapped portion may be guided onto the fixed base 3 and cut at once.

The width of the receiving groove 31 and the thickness of the base of the cutting blade 51 are such that the latter is thinner.

A dovetail groove 53 is formed on the side surface of the movable base 5, and a stopper 52 is slidably fitted into the dovetail groove 53.

In order to prevent the movable base 5 from falling when the end of the timing belt is inserted through the insertion port 43, it is preferable that the stopper 52 is locked to the upper ends of the guide columns 4, 4.

The shapes of the concave portion 11 and convex portion 12 of the timing belt 1 are not particularly limited as long as the convex portion 12 fits into the concave portion 11, and this Mal.

The cut shape of the part may be formed into a trapezoid as shown in FIG. 5, a U-shape as shown by the solid line in FIG. It is also possible to form the both side edges of 12 into a stepped shape.

In addition, there are several concave shapes II and convex shapes 12 (for example, a W shape).
It may be.

Further, although not shown in the drawings, the connecting piece 2 may be made of a staple.

"Effects of the Invention" According to the connection structure according to the present invention, one of the mating parts at the end of the timing belt is formed in a concave shape when viewed from one side, and the other is formed in a convex shape that almost fits the concave shape. Since the convex part is inserted into the concave part, the tensile force on the connecting piece acts almost at right angles, resulting in a strong connected state with high tensile strength.

Moreover, with this connection structure, an endless timing belt with any circumferential length can be easily obtained, and an endless timing belt with a long circumferential length can be manufactured at extremely low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view illustrating a poor implementation of the connecting structure according to the present invention, FIG. 2 is a plan view of the connecting portion, and FIG. 3 is a sectional view of the connecting portion with the connecting piece removed. Figure 4 is the second
5 and 6 are partial plan views illustrating modified examples of the joined state of the connecting portions; FIG. 7 is a partially broken exploded perspective view illustrating the cutter; and FIG. The figure is a perspective view showing a conventional connection structure. Explanation of the main symbols in the figure: l is the timing belt, la and lb are the ends of the timing belt, 11 is a concave shape, 12 is a convex shape, 13 is a groove part, 14
is the peak part, 2 is the connecting piece, W'' is the plate width of the connecting piece 2, and W' is the width of the groove part 13.

Claims (6)

[Claims] (1) One end of the timing belt is formed to have at least one concave shape when viewed from one side, and the other end is formed to have a convex shape that almost fits the concave shape, and the concave portion and the convex portion are connected to each other. A timing belt connection structure characterized in that the peaks and grooves on the surface of the belt are aligned and connected by a clip, staple, or other connection piece at the groove of the matching portion. (2) One end has a concave angular shape, and the other end has an acute angle shape that fits the concave shape.
The timing belt connection structure described in . (3) The timing belt connection structure according to claim 1, wherein the concave shape at one end is a trapezoid, and the other end is a trapezoidal convex shape that fits the trapezoid. (4) The timing belt connection according to claim 1, wherein the concave shape at one end is a U-shape and the other end is a convex shape that fits the U-shape. structure. (5) The timing according to claim 1, wherein the concave inner edge of one end is formed into a stepped shape, and the convex outer edge of the other end is formed in a shape that matches this. Belt connection structure. (6) According to claim 1, the connecting piece is a clip formed by bending a metal plate into a substantially gate shape, and the width of the metal plate constituting the clip is substantially the same as the width of the groove. timing belt connection structure.