JPH0626066B2 - Cassette mounting device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette mounting device used in a cassette type magnetic recording / reproducing device.

2. Description of the Related Art An example of a conventional cassette mounting device will be described below with reference to the drawings. 5 and 6 show a conventional cassette mounting device. In FIGS. 5 and 6, the cassette 1 is guided and inserted in the cassette holder 20 in the direction of arrow F. The insertion position of the cassette 1 is inserted until it comes into contact with the cassette stoppers 21a and 21b of the cut-and-raised portion installed at the deepest portion of the cassette holder 20. The cassette 1 is a cassette stopper 21a,
When it comes into contact with 21b, the rotation of the motor 4 is started by the detection means (not shown). The rotation of the motor 4 is transmitted by the transmission belt 5
Is transmitted to the pulley 6 provided on the worm shaft 7, and the worm 9 synchronized with the worm shaft 7 is installed and the bearings 8a and 8b planted in the side plate 3a rotate as guides. The rotation of the worm 9 includes a worm wheel 10 and a first gear 1 installed on the side plate 3a.
2, the driving gear 13, the third gear 14, and the fourth gear 15 are transmitted in this order. A drive lever 16 having the same rotation center as that of the fourth gear is installed, and the groove portion 16a of the drive lever and the cassette holder shaft 2 planted in the cassette holder 20 are in a positional relationship with each other. The cassette holder shaft is guided by the groove 23 installed in the side plate 3a to guide the cassette holder 20 to a predetermined position.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, when the cassette is inserted due to an excessive load due to shock, the cassette holder 2
The cassette stoppers 21a, 21b of 0 part are damaged or the first to fourth gears 11, 12, 13, 14, 1
5. There was a defect that the drive lever 16 part was destroyed.

Means for Solving the Problems In order to solve the above problems, the present invention adopts a structure in which a worm, which is a transmission means, can be moved in the axial direction, so that the worm wheel is shocked when the cassette is inserted. The present invention provides a cassette mounting device adapted to axially disengage a worm conforming to the above.

Embodiment Hereinafter, an embodiment of the cassette mounting apparatus of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a worm 9 and a worm wheel 10 are shown.
Fig. 3 and Fig. 4 show the meshing relationship of the worm shaft 7
The relationship between the worm and the worm 9 is illustrated. When the cassette 1 is inserted into the cassette holder 20 due to the rotation of the motor 4 being transmitted and the holder 20 being moved by the rotation of the motor at a speed higher than the moving speed of the holder 20 and an excessive load, the load transmitting direction path is opposite to the normal path. The cassette holder shaft 2 planted in the holder 20 becomes the driven side, and the force F thereof is from the drive lever 16 to the fourth gear 15, the third gear 14, the drive gear 13, the second gear 12, the first gear 11, the worm. It is transmitted along the wheel path and is transmitted to the worm 9. The structures of the worm 9 and the worm shaft 7 are shown in FIGS. 1 to 4. A recessed groove 9a is provided in the longitudinal direction of the worm 9, and a protruding groove 7a is provided in a part of the worm shaft 7 so as to be compliant. With the above-described configuration, the worm 7 is kept slidable in the axial direction, and the rotational force of the worm shaft is reliably transmitted to the worm 9. Further, the spring member 25 is brought into contact with one end of the worm 9 to constantly urge the worm 9 in the direction of arrow C. Now, when the cassette 1 is inserted by the impact load F, the rotational force in the a direction that overcomes the biasing force C of the spring member 25 is transmitted to the worm wheel 10, and the worm moves in the b direction from the positional relationship of FIG. Then, the positional relationship shown in FIG. 2 is obtained, and the worm 9 is disengaged from the meshing relationship of the worm wheel 10. The amount of movement of the cassette holder 20 due to the impact load is determined by the contact length of the rib member 25, and thus can be set arbitrarily. The worm 9, which has been disengaged by the worm wheel 10 due to the impact load, is configured so that when the impact load is released, the worm member 25 returns to the normal position so that the engagement with the worm wheel can be restored.

As described above, according to the present embodiment, it is possible to prevent the cassette mounting device from being damaged by alleviating the impact load by the spring member and separating the worm from the worm wheel.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to obtain the effect of preventing breakage of the cassette mounting device due to insertion of the cassette due to impact overload.

[Brief description of drawings]

FIGS. 1 and 2 are configuration diagrams of a main part of an embodiment of the present invention, FIG. 3 is a sectional view showing a configuration of a worm and a worm shaft in the embodiment, and FIG. 4 is a front view of the worm, FIG. 5 is a configuration diagram of a conventional cassette mounting device, and FIG. 6 is a perspective view showing the configuration of a cassette holder. 7 ... Worm shaft, 8b ... Bearing, 9 ... Worm, 1
0 …… Worm wheel, 11 …… 1st gear, 25 ……
Spring member, 26 ... Support shaft.

Claims (1)

[Claims] 1. A cassette mounting device comprising: a cassette holder for guiding and holding a cassette; and a cassette moving means for moving the cassette holder to a predetermined position. The cassette moving means is rotationally driven by a driving source. A shaft, a worm that is driven to rotate by the shaft, a worm wheel that meshes with the worm, and a transmission unit that transmits the rotation of the worm wheel to the cassette holder, the worm including the worm wheel. When the cassette is shockably inserted into the cassette holder by being movable in the meshing position and the non-meshing position along the shaft, and being biased by the biasing means in the direction of the meshing position. The worm wheel is configured to move the worm to the non-engaged position. Cassette loading apparatus characterized by.