JPH0643867Y2 - Flywheel drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a flywheel drive mechanism used in a cassette mechanism, and more particularly to a technique for detecting belt detachment in a guide roller.

[Prior Art] As a mechanism for driving a flywheel in a cassette mechanism, as shown in FIG. 3, a belt 6 is provided between a pulley 2 of a motor 1, a guide roller 3 and two flywheels 4 and 5. There is a mechanism for driving the flywheels 4 and 5 while applying a driving force from the pulley 2 of the motor 1 while guiding the belt 6 with the guide roller 3.

In the flywheel drive mechanism as described above, the guide roller 3 is usually V-shaped as shown in FIGS.
In addition to the circular belt-hanging rotating portion 8 having the groove 7, a circular rotating portion 9 having a smaller diameter than the rotating portion 8 is provided.

[Problems to be Solved by the Invention] By the way, in the guide roller 3 as shown in FIGS. 2 (A) and 2 (B), the belt 6 has the belt rotating portion 8 for hanging.
Even if it comes off from the V-shaped groove 7, it does not become defective in terms of data at the initial stage of the inspection on the manufacturing line, and it is shipped as it is as a product. After this, wow and flutter defects occur as the usage time increases.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and its purpose is to provide an initial stage before product shipment when the belt comes off from the rotating part of the guide roller for hanging the belt. An object of the present invention is to provide an excellent flywheel drive mechanism capable of detecting defects in stages.

[Means for Solving the Problems] In the flywheel drive mechanism according to the present invention, a guide roller is provided with a rotary portion for detecting a substantially polygonal shape in addition to a circular belt-like rotating portion for hanging a belt. Is characterized by.

[Operation] In the flywheel drive mechanism of the present invention having the above-described structure, when the belt comes off from the belt roller rotating portion of the guide roller, the detached belt is rotated for detecting a polygonal shape. Since a small wow and flutter defect occurs even if the guide roller is slightly rotated, the defect can be detected in terms of data even at the initial stage of inspection on the manufacturing line.

[Embodiment] An embodiment of a flywheel drive mechanism according to the present invention will be specifically described below with reference to the drawings. The same parts as those of the prior art shown in FIG.

In FIG. 1, the guide roller 3 has, in addition to a circular belt-shaped rotating portion 8 for belting, a rotating portion 10 for detection of a substantially triangular shape having a smaller diameter than this. Here, the corner portion 10a of the rotating portion 10 for detection has a shape having a curvature.

When the guide roller 3 of this embodiment having such a shape is applied to the belt driving mechanism as shown in FIG. 3, the operation is as follows.

That is, if the belt 6 is disengaged from the V-shaped groove 7 of the belt hooking rotating portion 8 during assembly, FIG.
In the conventional guide roller 3 as shown in (B), this defect could not be detected in terms of data, but in the present embodiment, the detached belt 6 has a substantially triangular-shaped rotating portion 10 for detection. Therefore, a wow and flutter defect is apparently caused only by slightly rotating the guide roller 3, and the defect can be surely detected as data even in the initial stage of the inspection on the manufacturing line.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, the detection rotating unit may have a quadrangular shape or a polygonal shape having five or more pentagonal shapes. However, if the number of corners is too large, the shape becomes close to a circular shape, and detection of wow and flutter defects becomes unclear. Therefore, in reality, a triangular shape or a quadrangular shape is desirable.

[Effect of the Invention] As described above, in the flywheel drive mechanism of the present invention, in addition to the circular belt hooking rotary portion, a substantially polygonal rotary detecting portion is provided as the guide roller. By improving the simple structure of using the guide roller, even if the belt comes off from the belt roller rotating part of the guide roller, it will not be detected as in the past and will not be shipped as a product as it is. Since a defect can be reliably detected at the manufacturing stage, a highly reliable and excellent cassette mechanism can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a guide roller used in a flywheel drive mechanism according to the present invention, FIG. 2 is a view showing a conventional guide roller, and FIG. 2 (A) is a perspective view. B) is a sectional view, and FIG. 3 is a perspective view showing an outline of a flywheel drive mechanism. 1 ... motor, 2 ... pulley, 3 ... guide roller, 4,
5 …… Flywheel, 6 …… Belt, 7 …… V groove,
8 ... Rotating part for belting, 9 ... Rotating part, 10 ... Detecting rotating part, 10a ... Corner part.

Claims (1)

[Scope of utility model registration request] 1. A flywheel drive in which a belt is placed between a drive-side pulley, a guide roller, and a flywheel, a drive force is obtained by the drive-side pulley, and the flywheel is driven while the guide roller guides the belt. The flywheel drive mechanism according to claim 1, wherein the guide roller is provided with a substantially belt-shaped rotating part for hanging a belt and a rotating part for detecting a substantially polygonal shape.