JPH0450669B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cassette loading device of a cassette front insertion type in a magnetic recording/reproducing apparatus.

[Background of the invention]

As is well known, in a cassette-type front-operated VTR, a tape cassette (hereinafter referred to as a cassette) is inserted into a cassette holder, and the cassette holder is moved horizontally and then vertically to eject the cassette. A predetermined cassette is loaded by moving the cassette back and forth from the position to the normal loading position.

To transfer the cassette holder, the power of the loading motor is transmitted to the cassette holder via a gear train, but since the cassette of a VTR is relatively large, it is necessary to transfer the cassette holder. Driving gears, arms, etc. are arranged on both sides of the holder, and power is usually transmitted to the gears on both sides by synchronizing members that have small gears integrally joined to the shaft at both ends of the shaft, and the cassette holder This makes the transfer smooth.

Conventionally, as shown in FIG. 6, the vicinity of both ends of the shaft 6 of the synchronizing member was supported by a round bearing hole 4b of the support frame 4, as shown in FIG. This caused the following problems.

Usually, the diameter of the shaft of the synchronizing member is smaller than the outer diameter of the pinion due to space constraints. The synchronizing member is a state in which the small gear 5 is integrally joined to both sides of the shaft body 6 in FIG. In order to assemble the synchronizing member to the shaft 6, the pinion 5 on at least one side cannot be assembled and joined to the shaft 6, so the shaft 6 must first be passed through the bearing hole 4b, and then the pinion 5 must be inserted into the shaft 6.
had to be assembled and joined to the shaft body 6.

That is, in order to incorporate the synchronizing member into the bearing hole 4b of the support frame 4, the very elongated shaft body 6 is inserted into the bearing holes 4 on both sides.
It was very difficult to assemble the small gear 5 because the needle had to be threaded through the needle (similar to threading a thread through the hole of a needle) and the small gear 5 had to be joined to the shaft 6 after threading was completed.

[Purpose of the invention]

The present invention eliminates the drawbacks of the prior art described above, and provides a shaft support structure for a synchronizing member that is easy to assemble and is suitable for automatic assembly.

[Summary of the invention]

In the present invention, in order to pivotally support the synchronizing member on the support frame with a single touch, a part of the bearing hole is cut out and a shaft body is assembled therein. Further, the notch portion was cut out toward the mating gear with which the small gear meshes.

Furthermore, notches larger than the outer diameter of the pinion gear are provided in the side plates on both sides of the cassette mounting device at the locations where the pinion wheel is located.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a right side view of the cassette mounting device according to the present invention in a cassette ejected state, Fig. 2 is a right side view of the cassette mounting device according to the present invention in a cassette properly mounted state, and Fig. 3 is a right side view of the cassette mounting device according to the present invention in a cassette properly mounted state. FIG. 4 is an external perspective view of the cassette mounting device, and FIG. 5 is an exploded perspective view of essential parts of the present invention.

The explanation will be given below using these figures as appropriate.

As shown in FIG. 4, the cassette mounting device has a right side plate 2 and a left side plate 3 arranged on both sides thereof, and is connected and fixed by a top plate 16 at the top and a support frame 4 at the front side. The right side plate 2 is provided with a long slot 2b, and the left side plate 3 is provided with a long slot 3b. A loading motor 11 is installed on the right side plate 2 (see FIGS. 1 to 3), and a worm gear 10 is integrally connected to the motor shaft. An intermediate gear 9 that meshes with the worm gear 10 is installed,
A drive gear 8 is meshed with a small diameter gear portion provided on the intermediate gear 9. Further, a small gear 5 is meshed with the drive gear 8. The small gear 5 (shown in FIG. 5) is integrally joined to the shaft body 6, and is referred to as a synchronizing member 15. In addition, the pinion 5 has a shaft body 6.
It is arranged at both ends of. A driving gear 7 (shown in FIG. 3) is installed on the left side plate 3, and a small gear 5
It's meshing with each other. The cassette holder 12 shown in FIG. 4 has guide pins 12a set up on both side walls 12b, and are inserted into the long groove holes 2b of the right side plate 2 and the long groove plate 3b of the left side plate 3. Further, as shown in FIGS. 1 and 2, a drive arm 13 that rotates integrally with the drive gear 8 is provided on the right side plate 2, and the guide pin 1 of the cassette holder 12 is inserted into the elongated hole 13a.
2a is inserted. Similarly, as shown in FIG. 3, a drive arm 14 that rotates integrally with the drive gear 7 is provided on the left side plate 3, and the guide pin 12a of the cassette holder 12 is inserted into the elongated hole 14a. ing.

In FIG. 5, a modification is shown in which a bearing wall 4C extending vertically on both sides of the support frame 4 for pivotally supporting the synchronizing member 15 has an opening notch in the direction of the drive gears 7 and 8. A bearing hole 4a is formed, and a projection is provided with a portion having a dimension L slightly smaller than the outer diameter of the shaft body 6.

The functions of the cassette loading device having the above configuration will be explained below.

As a main assembly procedure, the synchronizing member 15 is first assembled into the support frame 4. At this time, the attachment is performed by simply pushing it in the direction of the arrow in FIG. 5 (into the deformed bearing hole 4a), and then the right side plate 2 and the left side plate 3 are assembled from the sides with the cassette holder 12 interposed therebetween. Considering this work,
The right side plate 2 is provided with a notch 2a larger than the outer diameter of the pinion 5, and the left side plate 3 is similarly provided with a notch 3a larger than the outside diameter of the pinion 5 to facilitate assembly. can be done. After that, the top plate 16 is assembled from above.

With this configuration, the power of the loading motor 11 is transferred to the worm gear 10, intermediate gear 9,
The drive gear 8 on the right side, the small gear 5 on the right side, the shaft body 6, the small gear 5 on the left side, and the drive gear 7 on the left side are transmitted, and the cassette holder 12 places the cassette 1 by means of the drive arm 13 and the drive arm 14. The cassette 1 can be moved forward from the discharge position shown in FIG. 1, first horizontally transferred, and then vertically transferred to the normal loading position shown in FIGS. 2 and 3.

Also, although not shown, by pressing an eject button, etc., the loading motor 11 reverses and operates in the opposite direction (backward movement) to the ejection position shown in Fig. 1 from the normal mounting position shown in Figs. 2 and 3. The cassette 1 can be transported to the desired location. That is, by configuring the shaft support structure of the synchronizing member 15 as described above, it was possible to obtain a cassette mounting device having excellent assembly efficiency and suitable for automatic assembly. As a supplement, deformed bearing hole 4
By providing the notch opening of a in the direction of the mating gear, a progressively innovative configuration could be achieved without causing any hindrance to the gear transmission mechanism.

Further, by setting the L dimension of the deformed bearing hole 4a, there is an advantage that when the synchronizing member 15 is assembled (if the support frame 4 is made of an elastic member such as plastic), the synchronizing member 15 can be assembled with a click feeling and will not fall off.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a cassette mounting device that is easy to assemble and can be easily applied to automatic assembly.

[Brief explanation of the drawing]

Fig. 1 is a right side view of the cassette mounting device according to the present invention in a cassette ejected state, Fig. 2 is a right side view of the cassette mounting device according to the present invention in a cassette properly mounted state, and Fig. 3 is a right side view of the cassette mounting device according to the present invention in a cassette properly mounted state. FIG. 4 is an external perspective view of the cassette mounting device, FIG. 5 is an exploded perspective view of a main part of the present invention, and FIG. 6 is an exploded perspective view of a main part of a conventional example. 1... Cassette, 2... Right side plate, 2a... Notch, 3... Left side plate, 3a... Notch, 4... Support frame, 4a... Deformed bearing hole, 5... Small gear, 6... …
Shaft body, 15... synchronous member.

Claims (1)

[Claims] 1. In the cassette loading device that moves the cassette holder that holds and transports the tape cassette back and forth from the cassette discharge position to the regular loading device, the rotating bodies such as cassette holder driving gears located on both sides of the device are synchronized. A cassette mounting device characterized in that a part of a bearing hole of a shaft for transmitting power is provided with a notch with an opening directed toward a rotating body such as a gear for driving the cassette holder.