JPH0325316Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Technical field of the invention] This invention is a videotape recorder (hereinafter referred to as
This invention relates to a cassette holder mechanism used in devices such as VTRs.

[Technical background of the invention]

FIG. 1 shows a conventional cassette holder mechanism for a VTR, in which a cassette holder main body 11 can float or descend in the direction of arrows A←→B in the figure by means of a link mechanism. The link mechanism is composed of link levers 12A, 13A, 12B, 13B, etc.
One end side of each of 2B and 13B is rotatably attached to the side plates 11A and 11B of the cassette holder main body 11, and each other end side is attached to the support plate side 15A and 15B, respectively. In this case, a connecting rod 16 is provided to synchronize the left and right movements of the cassette holder main body 11 with respect to its vertical movement. This connecting rod 16 must be strong enough to withstand torsional torque, so it is generally thick. Reference numeral 20 denotes a thin box-shaped cassette, a cassette lid 20A is attached to the front side, and the tape drawer part can be opened and closed about the fulcrum part Mo. Therefore, when the cassette holder main body 11 is lowered, the cassette lid 20A is opened by the cassette opener 18 as shown in FIG.
The rotating end is pushed upward by the tape drawer to open the tape drawer.

[Problems with background technology]

According to the conventional cassette holder described above, when looking at the positional relationship between the link mechanism and the cassette holder main body, when the cassette holder main body 11 is lowered, the structure requires a very large space as shown in FIG. Immediately, the cassette holder body 1
It is necessary to secure a space for the device by taking into consideration the length W ₁ in the longitudinal direction of 1 and the space W ₂ for the arrangement of the connecting rod 16 .

[Purpose of invention]

This invention was made in view of the above-mentioned circumstances, and the object thereof is to provide a cassette holder device that can reduce the required space and also allows the connecting rod to be made smaller.

[Summary of the idea]

In this invention, the mounting position of the connecting rod 28 for synchronizing the left and right balance is changed to the link levers 23A and 23B.
The above object is achieved by providing the bending section at the bent portion of the bending section.

[Example of idea]

Examples of this invention will be described below with reference to the drawings. In FIGS. 3a and 3b, 21 is a cassette holder main body, and a thin box-shaped cassette 20 can be inserted and removed from the front opening in the direction of the arrow (D←→C) shown in the figure. The figure shows a state in which the cassette 20 is inserted. This cassette holder main body 21 is supported by a link mechanism, and can move up and down in the direction of arrow B←→A in the figure while maintaining its left-right balanced state. The link mechanism is configured to be approximately symmetrical, but the link mechanism is shown on one side in the figure. The link levers 22A and 23A that constitute the link mechanism are attached to the cassette holder main body 2.
The side plate 21A and the support plate 24A are arranged at an angle and substantially parallel to each other between the side plate 21A and the support plate 24A.

In this case, the lower link lever 22A has both ends attached to the support plate 24A and the side plate 21A, respectively.
Although it is rotatably attached by MA ₁ and MA ₂ , the upper link lever 23B is approximately L-shaped, and its bent portion 25A protrudes from the upper surface of the cassette holder main body 11. Both ends 26A and 27A are rotatably attached to the support plate 24A and the side plate 21A by shafts MA ₃ and MA ₄ , respectively.

3a and b above show the cassette holder 21
It shows that it is in a rising state and in a falling state. Since the illustration is from one side, the link levers on both the left and right sides are not shown, but as shown in FIG. 4, the lower link lever 22B, upper link lever 23B, and support plate 24B and a side plate 21B.

A connecting rod 28 for synchronizing the left and right balance of the cassette holder main body 21 is attached between the left and right bent portions 25A and 25B of the link levers 21A and 21B. A spring 29 is tensioned between the connecting rod 28 and a part of the cassette holder body 21 to obtain a lifting force for the cassette holder body 21.

When the cassette holder 21 is lowered together with the cassette 20 as shown in FIG. 3b, the cassette opener 18 opens the cassette lid 20A.

This invention is not limited to the above-mentioned embodiment, and as shown in FIG. 5, the movement of the connecting rod 28 may be further utilized so that the connecting rod 28 constitutes a cassette holding mechanism. That is, as shown in FIG. 5, a spring 2 whose one end is locked to a connecting rod 28
The other end of the cassette holding lever 30 is engaged with the other end of the cassette holding lever 30 to be stretched. The cassette holding lever 30 is attached to the side plate 21B of the cassette holder main body 21.
The distal end portion 30A can be pressed against the upper surface of the cassette 20 by the tensile force of the spring 29. The distal end portion 30A is regulated by a stopper 32 provided on the side plate 21B to prevent it from rotating more than necessary in the direction of arrow E when the cassette 20 is not inserted into the cassette holder main body 21. Therefore, the cassette presser lever 3
0 is elastically biased in the direction of arrow E in the figure, and can press the cassette 20 when it is inserted.
Although one cassette holding lever 30 is shown, it may be provided symmetrically.

The cassette holding force of the cassette holding lever 30 depends on the distance (a) between the spring 29 mounting position of the cassette holding lever 30 and the shaft 31, and the distance between the shaft 31 and the tip 30A of the cassette holding lever 30 (to be precise, the cassette pressing force of the lever 30). This can be adjusted by changing the ratio (a/b) of the distance (b) from the contact portion with the lever 30 (by changing the shape of the lever 30).

[Effect of idea]

According to the above-mentioned cassette holder device of this invention, since the connecting rod 28 is provided at the upper surface side of the cassette holder body, the connecting rod can be accommodated within the minimum space required for the cassette holder body. Effective for downsizing equipment. In addition, since the connecting rod does not act as a rotational fulcrum like in the past, the torsional torque for left-right balance is distributed between the fulcrum on the holder side and the connecting rod side, and in terms of strength, the connecting rod can be made smaller in diameter than before. It is good and can contribute to weight reduction. Furthermore, in conventional models, the holder floats or descends using the connecting rod as a pivot point, but in this case, the link lever becomes longer, so the diameter of the trajectory of the holder's ascending and descending pivots becomes large. However, according to the device of the present invention, the connecting rod is located on the top side of the holder body and is moved in a swinging motion, so the link lever can be shortened and the holder can be lowered quickly, which is effective for reducing space. It is.

Furthermore, if a spring is used to connect the connecting rod and the cassette holder body, and the cassette holder is given lifting force by this spring, this spring will fit into the wasted space that must be reserved to open the cassette lid. This also eliminates the need for a spring space that was conventionally installed between the link lever and its support member, contributing to the downsizing of the VTR.

Furthermore, when the connecting rod and the cassette presser lever are connected by a spring, the lifting force of the cassette holder can be obtained, and at the same time, the spring attached to the conventional cassette presser lever is no longer necessary, and the number of parts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional cassette holder device, Fig. 2 is an explanatory diagram of the operation of the device shown in Fig. 1, and Fig. 3 is a perspective view showing a conventional cassette holder device.
Figures a and b are side views showing an embodiment of this invention;
Figure 4 is a perspective view showing one embodiment of this invention;
The figure is a side view showing another embodiment of this invention. 20...Cassette, 21...Cassette holder body, 21A, 21B...Side plate, 22A, 22
B, 23A, 23B...link lever, 24A,
24B...support plate, 25A, 25B...bending part,
28...Connecting rod, 29...Spring.

Claims (1)

[Claims for Utility Model Registration] (1) A cassette holder main body into which a cassette can be inserted and removed, a pair of support members attached at fixed positions, each of the support members having a rotation fulcrum at one end, and the other. Rotation fulcrums on the end side are set on a pair of left and right lower link levers provided on the left and right side plates of the cassette holder main body, and rotation fulcrums are set on the pair of support members and the corresponding left and right side plates, respectively. Between the support member and the side plate, there is a pair of left and right upper link levers that are formed so as to partially protrude on the upper surface side of the cassette holder, and between the pair of left and right upper link levers, the cassette A cassette holder device comprising a connecting rod extending between a portion of the holder and projecting from the upper surface of the holder. (2) A practical device characterized by comprising a spring whose one end is locked to the connecting rod and the other end is locked to the cassette holder main body, and the spring is configured to obtain a lifting force for the cassette holder. A cassette holder device according to claim 1 of the patent registration claim. (3) The other end of the spring that is locked to one end of the connecting rod is locked to a cassette presser lever that is rotatably attached to the cassette holder body, and the cassette is inserted into the cassette holder body. Claim No. 1 for Utility Model Registration, which is characterized in that it is configured so that it can be held down elastically.
The cassette holder device described in Section 1.