JPS583957Y2 - shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock absorbing device, and more particularly to a shock absorbing device that automatically shuts off or disconnects the driving power supply in the event of an overload.

Conventionally, in a device that drives a load by using the driving force from a drive source through a transmission means such as a gear, when the load is suddenly applied, the load fluctuation does not immediately respond to the drive source and the load is This may cause financial damage such as damage.

For this reason, a device is known in which a brake force is applied to the drive source at the same time as the switch is turned off to stop the load.

However, with this device, the drive source does not come to a standstill immediately, resulting in disadvantages such as the load leading to damage.

Alternatively, when the driving force is transmitted to the load via a transmission means, it is possible to remove the transmission means, such as a gear, using a plunger or the like, but this increases the cost and causes problems such as generation of noise.

Further, in the case where a belt is used as a transmission means, it may be possible to make the drive source respond to sudden changes in load by utilizing the elongation or slippage of the belt, but this poses problems such as the longevity of the belt.

Furthermore, as shown in FIG. 1, the driving force from the driving source 1 rotates the first gear 3 fitted on the shaft 2 of the drive motor of the driving source, and the gear 5 is connected to the first intermediate shaft 6. The third gear meshes with the second gear 4 of the fitted second and third gears 4 and 5, and the third gear meshes with the fourth and fifth gears 8 and 9 fitted onto the second intermediate shaft T. It meshes with the fifth gear 9 and is arranged so that the load is driven by the fourth gear 8 (not shown).
A friction member 10 having a relatively large friction coefficient, such as a friction washer, is inserted into the first intermediate shaft 6 to prevent sudden changes in the load on the drive motor 1 and to buffer it. There are also known devices that do this.

However, this configuration has the disadvantage that the friction coefficient of the friction member changes due to thermal changes, resulting in instability.

The present invention aims to provide a shock absorber that eliminates the drawbacks of the conventional shock absorbers as described above.

The present invention will be described below regarding a buffer device for automatically inserting a cassette.

Although the same parts as in Fig. 1 are given the same reference numerals and redundant explanations are omitted, Fig. 2 is a plan view showing the principle of the present invention. Similarly, the first gear 3 is fixed.

Further, the plate 11 is fixed to the drive motor 1 with a screw 12, and the plate 11 is rotatably attached to the intermediate shaft 6 to which the second gear 4 is attached, and the first gear and the second gear are meshed. The first gear 3 transmits the driving force of the drive motor, and the first gear 3 makes a planetary motion with respect to the second gear 4. In the case of the springs 13' and 14' shown by broken lines in FIG. 2, the direction of tension of the springs is set within the tangent to reduce the planetary motion. It is a stage designed in a similar manner.

Hereinafter, a case in which an embodiment of the present invention is applied to a cassette pushing device will be described in detail.

FIG. 3 is a plan view of the present invention, and FIGS. 4 and 5 are side views, and explanations of the same parts in FIGS. 1 and 2 will be omitted.
The fourth gear 8 is engaged with a sixth gear 16, which is rotatably mounted on the shaft 15, and is also engaged with a pinion 18, which is rotatably pivoted on the shaft 1T. The pinion 18 is meshed with a sliding rod 19 having a rack 20.

The sliding rod 19 has a guide groove 21 and is configured to slide in the direction of arrow A-8 along a guide rod 22 installed in the chassis.

A clip 19a is provided at the tip of the sliding rod 19, and a third
Clip the cassette 23 as shown in the figures and FIG. The drive motor 1 is forced to reverse so as to slide in the direction.

Reference numeral 24 designates a guide roller that is in contact with the outer periphery of the plate 11 and serves to guide and damp the rotation of the grate 110 that rotates about the first intermediate shaft 6.

By rotating the drive motor 1 in the counterclockwise direction in the above-described configuration, the first gear 3 - the second gear 4 -> the third gear 5 -> the fifth gear 9 -> the fourth gear 8 -> 6th gear 16
In the thread path of → pinion 18 → rack 20, the sliding rod 19 grips the cassette 23 with the clip 19a and slides it in the direction of arrow B so as to move it to the playback position.

In this state, when the cassette hits the head or pinch roller, even if the drive motor 1 is turned off, due to the inertia of the drive motor 1 and the transmission means, the end position of the cassette will reach the point indicated by the arrow.
A large pressing force is applied in this direction, leading to damage to the cassette, drive motor, etc. Therefore, in the case of the present invention, when such a reaction force is applied, the drive source is moved through the opposite path to the first intermediate Since it is instructed to rotate around the shaft 6, in this case, the drive source rotates by the amount that the spring 13, 140 is unbalanced, and the sudden change in load is compensated for.

The present invention has great practical effects because it does not make noise and can protect the mechanism safely in the field without requiring a plunger or the like.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional shock absorber, FIG. 2 is a basic plan view of the present invention, and FIG. 3 is a plan view showing one embodiment of the present invention.
4 is a side view of the drive transmission section of FIG. 3, and FIG. 5 is a side view of the rack portion of FIG. 3. 1 is a drive motor, 2, 6, 7, 15, 17 are shafts,
3, 4, 5, 8, 9, 16 are gears, 18 is a pinion, 1
9 is a sliding rod, 20 is a rack, and 23 is a cassette.

Claims (1)

[Scope of utility model registration request] In the rotational force transmission device that decelerates the rotation of the rotational shaft and transmits it to the load by pressing the rotational shaft of a drive source such as a drive motor against a transmission means such as a gear that is rotatable about a central shaft, By fixing the drive source on the plate, rotatably holding the plate around the rotating shaft of the transmission means, and providing a spring that elastically restricts the rotation of the plate, it is possible to prevent sudden changes in load. A shock absorber in which a relatively large number of driving sources move planetarily around the transmission means to absorb fluctuations in the load.