JPH0630932U - Cassette holder opening / closing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a device that drives the cassette holder to open and close by the rotational force of the motor, the shock absorption by the drive torque from the motor at the opening and closing end, or the cassette holder due to an external force It is possible to absorb the torque applied to the gear when it is fixed or movable. [Structure] The rotation driving force of a motor-4 is transmitted by a plurality of gears and a transmission / reduction mechanism is engaged with an opening / closing support shaft 2a of a cassette holder-2 and a gear 2b which is concentric with the cassette holder-.
2 is configured to open and close, and a friction mechanism 6 including a gear 6b, an intermediate gear 7, a clutch plate 6d, and a spring 12 is provided in the transmission reduction mechanism. The friction mechanism 6 transmits the driving torque for opening and closing, and at the end of opening and closing, the clutch plate 6d and the gear 6b or the intermediate gear 7 idle to absorb excess torque, and the torque applied to the gear by external force is also the same. An opening / closing device for a cassette holder that is configured to idle in order to absorb torque.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for a cassette holder that allows the cassette holder to be opened / closed electrically by utilizing the rotational driving force of a motor.

[0002]

[Prior art]

 In recent years, the cassette holder opening / closing device has been required to have high quality and high accuracy, and various electric cassette holder opening / closing systems have been adopted in order to realize an electrically-operated high performance / cheap opening / closing device. .

An example of the above-mentioned conventional cassette holder-opening / closing device will be described below with reference to the drawings.

FIG. 3 is a perspective view of a conventional cassette holder-opening / closing device that electrically opens and closes a cassette holder. In FIG. 3, 1 is a loading base for mounting the motor / gear of the opening / closing device, 2 is a cassette holder for rotating and opening and closing by pivoting on a support shaft 2a, 3 is a cassette mechanism, 4 Is a motor and is fixed to the loading base 1 with screws. 14 is a pulley press-fitted into the motor shaft, 15 is a belt, and 7 is an intermediate gear. The driving force from the motor-4 is transferred to the intermediate gear 7 by the pulley 14 and the belt 15. It is received by the pulley and the driving force is transmitted from the gear on the same shaft. Reference numeral 8 is a drive gear, 16 is a drive link cam, and 18 is a spring, and a spring force is applied in a direction to always push out the drive link cam. The driving force from the intermediate gear 7 is transmitted to the driving gear 8, and the cam provided on the same shaft as the driving gear 8 moves the driving link cam 16 to open / close the cassette holder-2. In FIG. 3, the intermediate gear 7 and the drive gear 8 are directly meshed with each other, but it is also necessary to mesh another gear between them for transmission deceleration.

[0005]

However, the conventional cassette holder opening / closing device as described above does not damage the gears even when the cassette holder is suddenly closed while maintaining the holding force of the cassette holder against external force. Since it is driven by a cam to prevent it, and because it uses a belt and pulley, it requires many parts for its transmission speed reduction mechanism, and there is a problem that the opening and closing device is large. Was there.

In view of the above conventional problems, the present invention prevents the gears from being damaged even when the cassette holder is suddenly closed while maintaining the holding force of the cassette holder against an external force, and realizes downsizing. The purpose of the present invention is to provide an opening / closing device for a cassette holder.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the cassette holder opening / closing device of the present invention opens / closes the cassette holder by a transmission / reduction mechanism using a plurality of gears to rotate the rotational driving force of the motor. A friction mechanism with a transmission force due to a certain frictional force is installed inside to achieve miniaturization.

[0008]

[Action]

 With the above-described structure, the present invention keeps the holding force of the cassette holder against external force, prevents the gears from being damaged even when the cassette holder is suddenly closed, and holds the transmission force by the friction force of the friction mechanism. However, excess transmission force at each end of the cassette holder and opening / closing and impact force generated by inertial force can be absorbed by idling the gear of the friction mechanism and the clutch plate.

[0009]

【Example】

 Hereinafter, an embodiment of a cassette holder opening / closing device of the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view of a mechanism of a cassette holder opening / closing device according to an embodiment of the present invention, and FIG. 2 is an exploded configuration diagram of a mechanism of a cassette holder opening / closing device according to an embodiment of the present invention. .

In FIGS. 1 and 2, 1 is a loading base for mounting a motor / gear of an opening / closing device, 2 is a cassette holder which is opened and closed by a support shaft 2a, 3 is a cassette mechanism, 4 Is a motor and is fixed to the loading base 1 with screws. 5 is a worm pressed into the motor shaft, 6 is a friction mechanism, 6b is a worm gear, 6d is a clutch plate, 7 is an intermediate gear, 12 is a clutch spring, 13 is a spring retainer plate, and the friction mechanism 6 is The clutch plate 6d is sandwiched between the recess 6c of the worm gear 6b and the intermediate gear 7, the intermediate gear 7 is pressed against the worm gear 6b side by the clutch spring 12, and the worm gear 6b is pressed by the spring retainer 13. The worm gear shaft 6a is inserted into the worm gear shaft 6a by engaging with it or fixing it by press fitting. A drive gear 8 is rotatably supported by the drive gear shaft 8a. Numeral 10 is an end detection SW for detecting the end of the opening / closing operation.

The operation of the cassette holder opening / closing mechanism configured as described above will be described below.

First, the rotational driving force of the motor-4 rotates the worm 5, the worm gear 6b, and the friction force of the clutch plate 6d causes the intermediate gear 7 to rotate. Then, the rotational force of the intermediate gear 7 is transmitted to the drive gear 8b, the gear 8c of the drive gear 8 is rotated to mesh with the gear 2b of the cassette holder-2, and the cassette holder-2 is rotated about the support shaft 2a. Then, the opening operation is performed, and the cassette holder is driven until it is completely opened. Before that, the end detection SW 10 operates to stop the rotation of the motor-4. However, the extra transmission force due to the inertial force is applied to the tooth portion of the worm gear 6b and becomes an impact force, which is absorbed by the idling of the friction mechanism 6 to complete the opening operation. In the closing operation, the rotation direction of the motor is reversed and the operation opposite to the opening operation is performed.

As described above, according to the present embodiment, the friction mechanism 6 is provided in the transmission / reduction mechanism using a plurality of gears, so that the cassette holder-2 can be held while maintaining the holding force of the cassette holder-2 against the external force. Even when the gear is suddenly closed manually, the gear 7 of the friction mechanism 6 and the clutch plate 6d can be prevented from being damaged by idling. Further, by adopting a transmission / reduction mechanism for a plurality of gears, particularly a worm and a worm gear, it is possible to realize miniaturization and facilitate mounting on a product. In the embodiment shown in FIG. 2, the clutch plate 6d may have both front and back surfaces as friction surfaces, or one surface may be either the worm gear side or the intermediate gear side and the friction surface may be the opposite surface only. Is also good.

[0014]

[Effect of device]

 As described above, according to the present invention, by providing the friction mechanism in the transmission reduction mechanism by the plurality of gears, even when the cassette holder is manually closed suddenly while maintaining the holding force of the cassette holder against external force. The gears can be prevented from being damaged, and the impact force generated by the extra transmission force and inertial force at each end of the cassette holder and the opening / closing can be absorbed by the idling of the friction mechanism. Also, by adopting a worm or worm gear, it is possible to realize downsizing and easy mounting on the product.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire mechanism of a cassette holder opening / closing device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a mechanism of a cassette holder opening / closing device according to an embodiment of the present invention.

FIG. 3 is a perspective view of an entire mechanism of a conventional cassette holder opening / closing device.

[Explanation of symbols]

 1 Loading Base 2 Cassette Holder 3 Cassette Mechanism 4 Motor 5 Worm 6 Friction Mechanism 8 Drive Gear 10 End Detection SW 14 Motor Pulley 15 Belt 16 Drive Link Cam 18 Spring

Claims (2)

[Scope of utility model registration request] 1. A cassette holder comprising: a transmission / reduction mechanism for transmitting a rotational driving force of a motor; and a gear concentric with an opening / closing rotary support shaft of the cassette holder.
Is configured to open and close, and the clutch plate is sandwiched between the gears on the concentric shaft in the transmission reduction mechanism, and pressure is applied by a spring so as to have a certain frictional force, and the frictional force drives it. A cassette holder-opening / closing device having a friction mechanism for transmitting force. 2. The transmission reduction mechanism is provided with a worm and a worm gear, and the holding force for opening and closing the cassette holder by an external force is held by the friction force of the friction mechanism. The described cassette holder-opening and closing device.