JPH0740393B2 - Cassette holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a cassette holder, and more particularly to a cassette holder in which a holder main body moves in a predetermined direction.

<Prior Art> In a device using a cassette holder of this kind, for example, in a VTR, it is an important item to position a cassette containing a magnetic tape extremely accurately in the VTR main body. That is, if this positioning is performed accurately, it contributes to the stability of running when the tape is running, and further to the stability of recording and reproducing.

Conventionally, the following method has been used to position the cassette for the cassette holder in which the holder body moves up and down. That is, first, the tape cassette is inserted into the holder body horizontally or almost horizontally, and is lowered downward while maintaining this state. At this time, the cassette holder body is biased upward, and this lowering is performed against the bias. When the cassette holder has passed a predetermined position to be positioned by a predetermined amount, it is locked by a locking mechanism for positioning and locked at the predetermined position.

<Problems to be Solved by the Invention> By the way, as described above, in the cassette holder, the locking mechanism of the holder main body is generally provided on one of the left and right sides. Therefore, due to the aforementioned biasing force, the side of the holder body where the locking mechanism is not provided is inevitably displaced in the biasing direction due to factors such as bending of the holder body. The cassette holder that moves up and down with this
When the cassette is fixed to the chassis, the end of the cassette on the side where the locking mechanism is not provided is displaced upward even if the locking mechanism is used to position the cassette at a predetermined position.

In order to minimize this deviation, the holder body must be constructed of a sturdy material with little bending. However, along with this, the weight of the cassette holder itself becomes heavy,
In addition to hindering the weight reduction of the VTR, it was impossible to completely eliminate the gap.

In addition, it is conceivable to provide locking mechanisms on both the left and right sides of the cassette holder, but this also hinders the miniaturization of the VTR.
Further, when a lock mechanism is provided, it is necessary to provide a lock release mechanism corresponding to this, and if these are provided on both sides of the holder, the mechanism of each part of the apparatus becomes extremely complicated, which is not preferable.

In view of the problems as typified by the above, it is an object of the present invention to provide a cassette holder that does not hinder weight reduction, does not complicate the mechanism itself, and can accurately position the cassette.

<Means for Solving Problems> In view of the above-mentioned problems, the cassette holder of the present invention has a cassette holder main body (1) biased in a vertical direction with respect to the chassis, and the cassette holder main body in the above direction. To move this cassette holder body left and right side walls (1
L, 1R) with one end rotatably attached and the other end with the pair of rotation levers (3L, 3R) having engaging protrusions (8L, 8R) and the cassette holder body in the left-right direction. About the lock member (13) that locks against the bias on one side, and the frame (9L, 9R) provided on the chassis side
The frame has guide grooves (10L, 10R) formed at the same height with respect to the chassis, and when the cassette holder body moves against the bias, the lock member The rotation lever (3L) on the side where each of the engaging protrusions is provided is such that the rotation phase in the rotation direction is delayed from the other rotation lever (3R) by a predetermined phase (θ). A structure in which the portion is engaged with the guide groove of the frame is adopted.

<Operation> If the holder body is positioned by using the locking mechanism in the above-described structure, it can be compensated by the rotation phase of the rotation lever due to the bending of the holder body, and accordingly, the cassette holder body can be moved to a desired position. You can now position.

<Embodiment> FIG. 1 is a view showing in detail a main part of a cassette holder as one embodiment of the present invention, FIG. 2 is a view of the cassette holder of this embodiment seen from one side, and FIG. It is the figure which looked at the principal part of the cassette holder of an example from the upper part.

FIG. 2 is a view showing a state in which the cassette holder main body is raised and a cassette can be inserted. It should be noted that FIG. 2 schematically shows only a part necessary for explaining the present embodiment.

In FIG. 2, reference numeral 1 is a cassette holder body, which is a left side wall 1L.
One end of the rotating lever 3L is attached to the upper part so as to be rotatable around the fulcrum 2L. On the other hand, an engagement pin 5L provided at one end of a rotary lever 6L is slidably engaged in the direction of arrow A1 with a long groove-shaped opening 4L provided in the left side wall 1L. The turning lever 3L and the turning lever 6L are rotatably connected by a joint 7L.

9L is the left frame fixed to the chassis of the VTR, the fulcrum 1
The other end of the rotating lever 6L is attached so as to be rotatable around 1L. In addition, an engagement pin provided on the other end of the rotation lever 3L
The 8L is slidably engaged with the long groove-shaped opening 10L formed in the frame 9L in the arrow A2 direction. Here, the rotating lever 6L is biased in the direction of arrow A3 by the spring 12L.
As a result, the holder body is biased upward in the figure.

Further, a locking lever 13 is attached to the frame 9L so as to be rotatable around a fulcrum 14. The locking lever 13 is biased counterclockwise by a spring 15.

When the holder body 1 is pushed down against the biasing force of the spring 12 manually or by a motor from the state shown in FIG. 2, the engagement pin 5L moves to the right side in the figure along the long groove-shaped opening 4L, The engagement pin 8L moves to the right side in the figure along the long groove-shaped opening 10L. As a result, the bottom surface of the cassette holder body 1 descends in a state substantially parallel to the chassis.

Here, the engagement pin 8L moves to the right side in the drawing along the long groove-shaped opening 10L, thereby abutting on the end surface 16 of the locking lever 13 and rotating the locking lever 13 clockwise. When the locking pin 8L further moves to the right side in the figure, the locking pin 8L is recessed into the locking groove 17 of the locking lever 13, and the lever 3L is positioned by the biasing force of the spring 12. Further, the cassette holder body 1 is also positioned accordingly.

Although FIG. 2 shows the cassette holder of this embodiment as viewed from the left side, the right side has substantially the same structure except that there is no locking mechanism including the locking lever 13.

In FIG. 3, 20 is a shaft member for fixing the rotating levers 3L and 3R on both sides, and has a structure as a connecting rod. The shaft member 20 is rotatably supported on the left and right side walls of the cassette holder body 1. Therefore, the rotating levers 3L and 3R rotate with a predetermined phase relationship. As shown in FIG. 1, in the cassette holder of this embodiment, the rotating levers 3L and 3R rotate. The phase is shifted by θ °.

On the other hand, if the long groove openings 10L, 10R of the frames 9L, 9R are cut at the same height with respect to the chassis, this phase difference causes the right side wall 1R of the cassette holder body 1 to be slightly lower than the left side wall 1L. Rotating levers 3R and 3L function to be fixed by
Will be done. However, in reality, θ ° is determined so that the right side wall 1R and the left side wall 1L are positioned at the same height by the bending of the holder body 1 and the turning levers 3R and 3L.
That is, the function of the phase difference of θ ° described above compensates for the deflection of each part of the holder, and the bottom plate of the cassette holder is positioned parallel to the chassis.

According to the cassette holder having the above-described structure, the cassette holder main body can be positioned at a desired position with respect to the chassis without adding any new structure and without using a durable material having little bending. It is possible.

<Effects of the Invention> As described above, according to the present invention, it is possible to obtain a cassette holder that does not complicate the mechanism, does not hinder the weight reduction, and can accurately position the cassette at a desired position. it can.

Further, since the members used conventionally can be used as they are and the mounting state is simply changed, there is no need to redesign or remake the parts.

[Brief description of drawings]

FIG. 1 is a view showing in detail a main part of a cassette holder as an embodiment of the present invention, FIG. 2 is a view of the cassette holder of this embodiment seen from one side, and FIG. 3 is a cassette of this embodiment. It is the figure which looked at the principal part of a holder from the upper part. 1 is a cassette holder main body, 1L and 1R are side walls, 3L and 3R are rotating levers, 8L is an engaging pin, 9L is a frame fixed to the chassis, 10L is a long groove opening, 12L is a biasing spring, 13 is a locking lever, 14 is a fulcrum, and 17 is a locking groove.

Claims (1)

[Claims] 1. A cassette holder main body (1) biased in a vertical direction to a chassis, and left and right side walls (1L, 1R) of the cassette holder main body for moving the cassette holder main body in the direction. A pair of rotation levers (3L, 3R) each having one end rotatably attached and the other end having an engaging protrusion (8L, 8R), and the cassette holder body being biased on one side in the left-right direction. It has a lock member (13) that locks against the frame and a frame (9L, 9R) provided on the chassis side, and the frame has guide grooves (10L, 10R) at the same height with respect to the chassis. When the cassette holder main body moves against the bias, the rotation lever (3L) on the side where the lock member is provided has a rotation phase in the rotation direction of the other side. Predetermined phase (θ) with respect to the turning lever (3R) A cassette holder, wherein each of the engagement protrusions is engaged with a guide groove of the frame in a delayed state.