JPH1089444A - Driving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a play due to backlash, thereby carry out stable power transmission. SOLUTION: In a driving mechanism, transmitting power upon engaging both teeth of a timing pulley 10 and a timing belt in combination, this timing pulley 10 is divided into two sub-timing pulleys 10A and 10B, a single tier of sub-teeth 12a and 12b is installed each in these respective sub-timing pulleys 10A and 10B, and both these sub-teeth 12a and 12b are assembled after being shifted with each other as far as for a portion of backlash. The sub-both 12a comes into contact with a rotative direction side of the belt of a tooth of the timing belt, while the sub-tooth 12b is made to come into contact with a half- turned direction side of the belt of the tooth of the timing belt, therefore even in the case where direction of rotation is altered, there is no delay due to the backlash, so that power transmission can be performed without delay.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive mechanism, and more particularly to a drive mechanism having a timing belt and a timing pulley, and transmitting power by meshing teeth of the timing belt and teeth of the timing pulley.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional driving mechanism of this type is composed of two timing pulleys 10 and a timing belt 20 on a driving side and a driven side. The power is transmitted by meshing with the teeth.

The conventional timing pulley 10 is provided with only one row of teeth 12 around its circumference, as shown in FIG.

[0004]

As a result, gaps 31 and 32 called backlash exist between the teeth 12 of the timing pulley 10 and the teeth 22 of the timing belt 20, as shown in FIG. In addition, when the direction of rotation changes, the direction of the backlash is reversed, so that rattling and vibration occur due to the gaps 31 and 32, which is a problem.

Accordingly, an object of the present invention is to provide a drive mechanism capable of solving backlash due to backlash and performing stable power transmission.

[0006]

According to the present invention, there is provided a drive mechanism having a timing belt and a timing pulley, and transmitting power by meshing the teeth of the timing belt with the teeth of the timing pulley. Is divided into a plurality of rows of auxiliary teeth, and the divided auxiliary teeth are shifted by a predetermined angle in a circumferential direction of the timing pulley.

[0007] With this arrangement, of the plurality of sub-teeth divided and shifted by a predetermined angle, one sub-teeth is in contact with the rotation direction of the belt, and another sub-teeth is in contact with the anti-rotation direction of the belt. Therefore, even if the rotation direction changes, there is no delay due to backlash, and power transmission is possible without delay.

As a result, the problem of backlash due to backlash is solved, and stable power transmission can be achieved.

[0009]

Next, a drive mechanism according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 3, the drive mechanism 1 of the present embodiment has two timing pulleys 10 on the drive side and the driven side.
And the timing belt 20, and the power is transmitted by meshing the teeth of the timing pulley 10 with the teeth of the timing belt 20.

The timing pulley 10 of the present embodiment is
As shown in FIG. 1, two sub-timing pulleys 10A,
10B, and each sub-timing pulley 10
A and 10B are provided with a row of auxiliary teeth 12a and 12b, respectively, and the auxiliary teeth 12a and 12b are displaced from each other by an amount corresponding to the backlash.

In this manner, among the two rows of auxiliary teeth 12a and 12b shifted by a predetermined angle, the auxiliary teeth 12a are, for example, as shown in FIG. And the auxiliary teeth 12b are
Since the belt comes into contact with the belt in the opposite rotation direction, even if the rotation direction changes, there is no delay due to backlash, so that power transmission can be performed without delay.

As a result, the problem of backlash due to backlash is solved, and stable power transmission can be achieved.

[0014]

According to the present invention, backlash can be removed, and as a result, rattling and vibration caused by backlash can be removed, and stable power transmission can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a timing pulley used in a drive mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an engagement state between a timing pulley and a timing belt used in the drive mechanism according to the embodiment of the present invention.

3A and 3B are views for explaining an embodiment of the present invention and a conventional driving mechanism, wherein FIG. 3A is a plan view and FIG. 3B is a front view.

FIG. 4 is a diagram for explaining a timing pulley used in a conventional driving mechanism.

FIG. 5 is a diagram for explaining an engagement state between a timing pulley and a timing belt used in a conventional drive mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drive mechanism 10 ... Timing pulley 10A, 10B ... Sub-timing pulley 12 ... Teeth 12a, 12b ... Sub-tooth 20 ... Timing belt 22 ... Teeth 31, 32 ... Backlash

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Riichi Kano 3--14-20 Higashinakano, Nakano-ku, Tokyo Inside Kokusai Electric Corporation

Claims (1)

[Claims] 1. A drive mechanism having a timing belt and a timing pulley, and transmitting power by meshing teeth of the timing belt with teeth of the timing pulley, wherein the teeth of the timing pulley are replaced with a plurality of rows of auxiliary teeth. A driving mechanism, wherein the divided auxiliary teeth are shifted by a predetermined angle in a circumferential direction of the timing pulley.