JPS6340977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a toothed endless belt, and is particularly suitable for use in conveyors, etc., in which a conveying member is attached to the outer periphery of the belt, and articles are accommodated and conveyed by the belt. This invention relates to a toothed endless belt.

Conventional technology Toothed endless belts are used in combination with gears on conveyors that convey articles at regular intervals to maintain synchronization of conveyance speed, but they are used for manufacturing circular belts. It is generally manufactured using a mold as an endless product with no joints from beginning to end. Therefore,
In the case of a belt with a long circumference, not only the mold becomes large, but also the equipment for assembling the belt and vulcanization molding becomes large and inevitably becomes expensive. Furthermore, there is a limit to the size of the device, and it has been considered impractical to manufacture an extremely large endless belt by integral molding.

Therefore, in order to obtain a large-sized toothed endless belt, a method has been proposed in which both ends of a long band-shaped toothed belt are butted together and the joints are joined to form an annular belt. As a technique for joining the ends of such a toothed belt, for example, as disclosed in Japanese Patent Publication No. 57-1697, a male protrusion and a female protrusion that engage with each other are provided at the end of the belt, and these are engaged. and connect them with a pin inserted from the side,
There is a method in which the load applied to the joint is transmitted to a reinforcing cord embedded in the belt via a pin. Joined by a joining member consisting of a toothed side member having at least two recesses in the front and back direction that have the same shape as the teeth of the belt to be joined on the inner side, and a back side member attached to the toothed side member in opposition to the toothed side member sandwiching the belt therebetween. It shows how to do this.

However, the tensile stress that occurs when the belt runs is directly applied to the joints of belts joined using these conventional techniques, so the holes for passing the pins or setscrews that connect the joint members may become enlarged, or the teeth may become damaged. This causes the inconvenience of deformation, which increases the distance between the teeth on both sides of the belt joint, and also causes the joint to separate due to tearing of the screw hole due to insufficient transmission of load to the reinforcing cord. This often led to accidents.

Problems to be solved: Eliminates the above-mentioned weakness in tensile strength, which is the essential drawback of toothed belts joined by conventional techniques, and has sufficient strength to prevent deformation or breakage. Although end face joining technology has been desired, the present invention aims to substantially solve these problems and provide a toothed endless belt having sufficient strength and a method for forming the same.

Means for Solving the Problems An object of the present invention is to arrange at least two toothed belts with ends in parallel with each other with their side surfaces in close contact with each other, and to form a ring shape by abutting the end surfaces of each belt and adjusting the position of the joint. A toothed endless belt is formed by joining the belts at equal intervals including the joint position by means of a joining means which is arranged so as not to be adjacent to each other and is clamped from the back and front sides of the toothed belt. It is achieved by doing so.

More specifically, the toothed endless belt of the present invention comprises a plurality of end belt members each having teeth on the back surface, a toothed side member having at least two recesses in the front and rear sides having the same shape as the teeth of the belt member, and An endless belt that is integrally joined by a connecting means consisting of a back side member that sandwiches a belt member and comes into contact with the tooth side member, and a fastening member that connects the tooth side member and the back side member. In this case, the belt members are arranged in two or more rows adjacent to each other, and are arranged so that the positions of the seams where the end surfaces of the belt members abut against each other are not adjacent to each other, and are arranged at equal intervals including the positions of the seams. The coupling means achieves mutual coupling between the end surfaces and the mutual coupling between the side surfaces of the belt members, and the coupling means provided at the joint position of one of the belt members and the joint position of the other belt member are achieved. This is further improved by arranging at least one, preferably two or more, seamlessly provided connecting means between the provided connecting means.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the driven side portion of a conveyor using the toothed endless belt of the present invention.
A toothed endless belt 3 having a seam 6 is wound with the teeth 7 facing inward, and is driven and driven by a driving belt pulley (not shown). A plurality of conveying members 5 are arranged at equal intervals around the entire circumference of the belt 3.
Articles are transported as the belt 3 runs.

2 and 3 show the structure of the joints of the belt 3. The endless belt 3 has end belt members 4, 4 of a predetermined length lined up, and teeth 7 fitted on the back side of the belt members 4, 4. A tooth side member 8 is provided on the front side, and a back side member 10 is provided on the front side in contact with the back surface 9, and a set screw passes through a screw hole 12 drilled in the teeth 7a, 7a at the end of the belt members 4, 4. 11, the tooth side member 8 and the back side member 10 are fastened together.

The conveyance member 5 is a box-shaped cylinder provided above the back side member 10, and is designed to hold and convey an article while it is inserted therein, but it is not necessarily formed integrally with the back side member 10. There's no need to be there.

The belt member 4 is formed by embedding reinforcing cords in the core part over the entire length, and filling and coating the gaps and outer parts with flexible rubber, resin, etc., and the back side has a plurality of reinforcing cords arranged at regular intervals. Trapezoidal cross-section tooth 7
is formed perpendicular to the longitudinal direction of the belt member 4. Then, the end surface of the belt member 4 is
It is formed by cutting parallel to the teeth 7 at the center of the teeth of the strip.

The tooth side member 8 is provided with two grooves 13 having the same shape as the teeth 7, and is formed so as to be able to fit into two adjacent teeth 7, and the joint 6 where the end surfaces of the belt member 4 butt each other is recessed. When positioned in the middle of the groove 13, the teeth on both sides of the seam 6 engage with the groove 13, respectively. Both ends 14, 14 of the tooth side member 8 have a length that reaches an intermediate position between the tooth 7 that engages with the groove 13 and the adjacent tooth, and have a curved surface shape, so that the belt member 4 is flexible. The height is such that the end 14 and the back surface 1 of the belt member 4 are not obstructed.
5, a gap 16 is formed between the two.
Further, the width of the tooth side member 8 is 2 of the width of the belt member 4.
It is possible to connect two belt members 4, 4 arranged side by side at the same time.

Four female screw holes are provided on the center line of the groove 13 of the tooth side member 8, and the back side member 10
A set screw 11 is inserted through the screw hole 12 of the belt member 4 sandwiched between the countersink hole provided correspondingly to the set screw 11.
Both members 8 and 10 are coupled together. This connection is exactly the same whether there is a seam or a seamless position. That is, at the position where there is a seam, the joining of both ends of the belt member across the seam and the lateral joining of the seamless belt member and the belt member with the seam are simultaneously achieved. Only a connection between laterally aligned belt members is then achieved.

In this example, the set screw 11 is used as a fastening member for coupling the tooth side member 8 and the back side member 10, but it is possible to select other appropriate means such as a rivet.

To assemble the toothed endless belt 3 using the above-mentioned members, two belt members 4, 4 are used.
are lined up in two rows, and their end faces are aligned at the mounting pitch of the conveyor member 5 (i.e., the mounting pitch of the belt coupling means).
The end surfaces of the respective belt members 4, 4 are brought into contact with each other by a length corresponding to an integral multiple of the above, and the joints 6, 6 are made.
is formed, and a tooth side member 8 is provided from the back side at the position of the seam 6, and a conveying member 5 is provided from the front side.
0 is attached so as to straddle the seam 6 and simultaneously cross over adjacent belt members, and is tightened with set screws 11 to form a loop-shaped endless belt 3.
After joining the two joints 6, 6 in this way, the conveying members 5 are attached at predetermined pitches along the entire circumference of the belt 3 in accordance with the same procedure as described above, and the two belt members 4, 4 are attached horizontally. Complete the combination of directions.

In order to assemble the toothed endless belt so as to be wound around the belt sheave 2, it is possible to follow the procedure for assembling the belt member 4 while winding it around the belt sheave 2 in advance.
Even in equipment equipped with many devices around the belt, it becomes possible to replace the endless belt without disassembling the equipment.

The outer periphery of the illustrated conveyor belt pulley 2 is provided with teeth 20 having a shape corresponding to the gap between the teeth 7 of the belt and a groove 21 having a shape corresponding to the tooth side member 8. It is formed so as to correspond to the four teeth 7 followed by the coupling means corresponding to two teeth. Further, a protrusion 22 is provided at the center bottom of the groove 21, and the tooth side member 8
When it engages with the belt pulley 2 and circulates in an arc, it is restricted by the protrusion 22, so that it circulates in a substantially perfect circle.

Effects of the Invention In the toothed endless belt of the present invention formed as described above, the joints of the belt members are misaligned, and the connecting means connects the end faces sandwiching the joint, and at the same time connects the side faces of adjacent belt members to each other. Since this has also been achieved, the bonding strength is significantly improved compared to the conventional bonding only between the end faces.

For example, two toothed belt members each having a width of 31.8 mm are connected in parallel, and a connecting means configured as in the above-mentioned embodiment in which two teeth are engaged is assembled so that the two teeth are separated. When both ends of a specimen of an endless belt as shown in FIG. 4 were grasped with clamps for a tensile tester and the tensile strength was measured, the following results were obtained.

If the tensile strength in (a) is 1 when the joints of the left and right belt members are not shifted, the tensile strength in (b) is 1.3 when the joints are shifted by 2 pitches and one connecting means is placed between the joints, and the tensile strength at the joint is 1.3. The strength of (c) is 1.68 when the joints are shifted by 2 pitches and one coupling means is placed between the seams and one on both outer sides, and the strength of (c) is 1.68 when the joints are further shifted by 3 pitches and two coupling means are placed between the seams and one on both outer sides. The strength of (d) was 1.78 when one connecting means was arranged.

That is, it was confirmed that a practically sufficient tensile strength can be obtained by setting the seam shift amount to 2 pitches or more.

Effects of the Invention As explained in detail above, the toothed endless belt of the present invention has significantly improved tensile strength and improved reliability compared to the conventional endless belt with end surface joints. ,
Endless toothed belts with seams can now be used with confidence. In addition, when attaching and detaching the belt when it is worn out or damaged, or when performing periodic repairs, the belt can be easily detached by removing the belt joints, which greatly reduces work time. It is actually possible to economically assemble an endless belt of any length using band-shaped toothed belt members, and it can be used for various timing belts in addition to conveyors.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of a conveyor using a toothed endless belt according to the present invention, and FIG.
The figure is an enlarged front view showing the connection of belt seams, and FIG. 3 is a plan view showing the arrangement and assembled state of the belt. FIG. 4 is a diagram showing the structure of a sample for measuring the joint strength of a toothed belt. 2... Belt wheel, 3... Toothed endless belt, 4... Belt member, 6... Seam, 8... Tooth side member, 10... Back side member, 11... Set screw.

Claims (1)

[Scope of Claims] 1. A plurality of end belt members each having teeth on the back side, and a tooth side member having at least two recesses in the same shape as the teeth of the belt member in the front and back, and a tooth side member having the belt members sandwiched therebetween. In the endless belt, the belt member is integrally joined by a connecting means consisting of a back side member that is in contact with the tooth side member, and a fastening member that connects the tooth side member and the back side member. The coupling means are provided in two or more rows adjacent to each other, are arranged so that the positions of the joints where the end surfaces of the belt members butt each other are not adjacent to each other, and are arranged at equal intervals including the positions of the joints. A toothed endless belt characterized in that the end surfaces of the belt members are joined to each other and the side surfaces of the belt members are joined to each other. 2 At least one, preferably two or more, coupling means provided at a position other than the joint are arranged between the coupling means provided at the seam of one of the belt members and the coupling means provided at the seam of the other belt member. A toothed endless belt according to claim 1. 3. The toothed endless belt according to claim 1, wherein the back side member constituting the coupling means has a configuration suitable for conveying articles. 4. The end face of the first belt member with an end having teeth on the back surface is placed and fitted onto a tooth side member having at least two recesses in the front and back that have the same shape as the teeth of the belt member, and Teeth are fitted into the tooth side members arranged at regular intervals, and then a second belt member having the same shape as above is shifted by a length corresponding to an integral multiple of 2 or more of the given distance, and the belt member is Teeth are fitted into the toothed side members with mutual side surfaces in close contact with each other, and the end faces of the first belt member and the end faces of the second belt member are placed on the toothed side members separated by two or more. After that, the belt member is sandwiched between the dorsal side members and the dorsal side members are attached so as to be in contact with the tooth side members respectively, and the tooth side member and the dorsal side are connected by a fastening member passed through a hole formed in the belt member. By combining the parts,
A method for forming a toothed endless belt, which simultaneously achieves coupling of end faces of a first belt member, end faces of a second belt member, and mutual coupling of side surfaces of belt members.