JPH0631233Y2 - Toothed belt connection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a toothed belt connecting mechanism for connecting both ends of a toothed belt to form an endless belt.

[Conventional technology]

For example, when manufacturing a long endless toothed belt, such as the endless toothed belt used in automatic door drives, connect both ends of the toothed belt to form an endless belt. There are many.

In such a case, conventionally, as shown in FIG. 4, both end portions of a toothed belt a are sandwiched between an uneven plate b having a tooth portion meshing with the teeth of the belt a and a flat plate c. The end portions of the toothed belt a are connected to each other by tightening and fixing the bolts d penetrating these a, b and c and the nuts e screwed to the bolts d.

[Problems to be solved by the device]

 The above-mentioned conventional example has the following problems.

That is, when the axial distance between the pulleys around which the endless toothed belt is stretched is constant, when connecting both ends of the toothed belt a to form an endless belt, a certain amount of tension is applied to the belt a. Although the end portions will be connected to each other, in the above connecting direction, it is very difficult to connect the toothed belt a while pulling it with a constant force, and moreover, since the tooth pitch is pulled by each pitch, The tension was applied in stages, and the fine adjustment of the tension could not be performed.

In view of the above-mentioned conventional drawbacks, the present invention aims to provide a toothed belt connecting mechanism that can be connected to a belt in a state in which a desired tension is applied by a simple operation.

[Means for Solving the Problems]

The technical means taken by the present invention to achieve the above object are as follows. That is, in the toothed belt connecting mechanism according to the present invention, a toothed pulley that is rotatable only in the clockwise direction and a toothed pulley that is rotatable only in the counterclockwise direction are provided on one movable member. Axially supported in a state in which a predetermined interval is formed between the outer peripheral tooth portions, with both ends of the toothed belt spanning between a plurality of pulleys being back to back, inserted between the both toothed pulleys, The teeth of the belt are meshed with the outer peripheral teeth of the pulley with both teeth.

[Action]

According to the above configuration, in a state where both ends of the toothed belt are back-to-back, the toothed belt is inserted between the toothed pulleys in a rotatable direction, and the tip of the toothed belt is pulled through a spring balance. , If a predetermined tension is applied to the belt and the pulling is stopped in this state, the toothed pulleys on both sides cannot rotate in the opposite direction, so both ends of the toothed belt are fixed in that position and connected to each other. And become endless,
Moreover, a predetermined tension is maintained.

Further, when the toothed belt is stretched, the tension of the belt can be adjusted only by pulling the end portion of the belt inserted between the toothed pulleys.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an automatic door driving device to which the toothed belt connecting mechanism A according to the present invention is applied. In the figure, 1 is a door, 2 is an endless toothed belt, and a drive side pulley 3
And the pulley 4 on the driven side. 5
Is a motor for driving the driving pulley 3 in the forward and reverse directions. 6
Is a movable member forming a part of the toothed belt connecting mechanism A, and the door 1 is connected to the movable member 6.

As shown in FIGS. 1 and 2, the toothed belt connection mechanism A includes a toothed pulley 7 that is rotatable only in a clockwise direction and a toothed pulley 8 that is rotatable only in a counterclockwise direction. The movable member 6 is axially supported in a state in which a predetermined gap is formed between the outer peripheral tooth portions 7a, 8a of the pulleys 7, 8 with both teeth, and is hung across the pulley pulleys 3, 4 on the driving side and the driven side. With both ends of the passed toothed belt 2 back-to-back, the toothed belt 2 is inserted between the toothed pulleys 7 and 8 so that the teeth 2a of the belt 2 are outer toothed portions of the toothed pulleys 7 and 8. It is configured to engage with 7a ..., 8a. The gap between the outer peripheral tooth portions 7a, 8a of the toothed pulleys 7, 8 is such that the back faces of the toothed belts 2 inserted back to back are in close contact with each other, or even if there is a gap between the back faces of the belts. Is set to be smaller than the tooth height of the toothed belt 2.

In this embodiment, as means for structuring the toothed pulleys 7, 8 rotatably only in the directions (clockwise or counterclockwise) indicated by arrows, steel balls 9 ... Although a stepless one-way clutch equipped with a spring 10 that presses between the inner surface of the smooth outer ring and the inclined surface of the inner ring is used, a ratchet type that uses ratchet pawls instead of the steel balls 9 ... It may be a one-way clutch. In this case, the pitch of the gear on the inner surface of the outer ring with which the ratchet pawl is engaged is made as small as possible, and the belt movement amount due to the rotation of the toothed pulleys 7 and 8 per pitch is determined by the teeth of the toothed belt 2.
By making the pitch smaller than the pitch of 2a ..., the belt tension can be finely adjusted.

Further, in the above embodiment, the present invention has been described by taking the drive device of the automatic door as an example, but the print head drive device of the printer, the industrial sewing machine, the traveling drive device of the robot carriage, etc.
The toothed belt connecting mechanism A of the present invention can be applied as long as the endless toothed belt is used to reciprocate the movable portion.

[Effect of device]

Since the present invention has the above-mentioned configuration, it is easy to insert the toothed belt between the toothed pulleys from the rotatable direction of the toothed pulley in a state in which both ends of the toothed belt are back to back and pull the belt tip. By operation, both ends of the toothed belt can be connected to make it endless, and furthermore, by pulling the belt tip inserted between the toothed pulleys via a spring scale, it is possible to accurately measure the belt. Tension can be applied. In particular, by using a stepless one-way clutch such as the embodiment or a ratchet type one-way clutch with a small gear pitch as a means for configuring the toothed pulley to rotate only in a predetermined direction, fine adjustment of tension is possible. Is possible.

Further, when the toothed belt is stretched, the tension can be adjusted only by pulling the tip portion of the belt inserted between the toothed pulleys.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an enlarged cross-sectional view of a main part of a toothed belt connecting mechanism according to the present invention, FIG. 2 is a schematic plan view of a toothed belt connecting mechanism, and FIG. FIG. 3 is a perspective view of a main part of an automatic door driving device to which a toothed belt connecting mechanism is applied. FIG. 4 is an explanatory diagram of a conventional example. A ... Toothed belt connection mechanism, 2 ... Toothed belt, 2a ...
Tooth, 3, 4 ... Pulley, 6 ... Movable member, 7, 8 ... Toothed pulley, 7a, 8a ... Outer peripheral tooth portion.

Claims (1)

[Scope of utility model registration request] 1. A toothed pulley rotatable only in a clockwise direction and a toothed pulley rotatable only in a counterclockwise direction are provided on one movable member at predetermined intervals between outer peripheral tooth portions of these toothed pulleys. The toothed belt is pivotally supported in a state in which a gap is formed, and both ends of the toothed belt spanning a plurality of pulleys are back-to-back, and the toothed belt is inserted between the toothed pulleys so that the teeth of the belt are A toothed belt connecting mechanism characterized in that it is meshed with the outer peripheral tooth portion of a toothed pulley.