JPS6246460A - Cassette holder - Google Patents

Abstract

PURPOSE:To simplify the structure of a cassette holder and to surely prevent a cassette from being incorrectly inserted without accurate working by providing a projection part for preventing the cassette from incorrect insertion and a pressing member the position of which is restricted which restricts the position of the cassette. CONSTITUTION:Levers 13, 14 are pivotally fitted to a joint 15 and projected parts 13c, 14c are moved in apertures 10a, 11a. A projection part 16 for preventing incorrect insertion is formed on the bottom part of the holder 10, the pressing member 17 excited by a spring 18 is fitted to a shaft 19 and its position is restricted by a hooked part 13d of the lever 13. If the cassette is reversely inserted, the leading end of the cassette is abutted upon the projection part 16 and the upper paft of the cassette is pressed by the pressing member 17 to interrupt the insertion of the cassette. When the cassette is correctly inserted, the lever 13 is rotated and the positional restriction by the member 17 is released. Consequently, the cassette can be surely prevented from incorrect insertion without especially the accurate work.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a cassette holder, and particularly to a cassette holder that is movable between a position for inserting a cassette and a position for using the cassette, and that prevents unauthorized insertion of the cassette. The present invention relates to a cassette holder provided with means for.

<Prior Art> Conventionally, cassette holders used in VTRs and the like are provided with means to prevent unauthorized insertion, such as insertion from the rear end side of the tape cassette or insertion upside down. For example, a method is to provide a notch along the insertion direction that opens only toward the front end of the cassette on the bottom surface of the cassette, while a protrusion that fits into this notch is provided on the bottom plate of the cassette holder. It has been known. By configuring as described above, when the cassette is inserted correctly, the protrusion □ of the holder retracts into the notch of the cassette, allowing the cassette to be inserted into the holder, and when the cassette is inserted incorrectly, the end of the cassette falls into the notch of the cassette. This can be prevented by coming into contact with the protrusion.

By the way, at this time, if the upper surface of the cassette is not positioned at all with respect to the holder, the cassette tool will climb over the projection and be inserted into the cassette holder.

Therefore, in general, the position of the upper surface of the cassette is also restricted relative to the cassette holder, so that the above-mentioned situation does not occur. Various configurations have been disclosed.

<Problems to be Solved by the Invention> However, when performing the above-described positional restriction, this positional restriction will also be performed even when the cassette is correctly inserted. Therefore, even in this case, the degree of freedom of the cassette in the vertical direction with respect to the holder is reduced, that is, the degree of freedom greater than the depth of the notch provided in the cassette cannot be obtained.

On the other hand, when a tape is pulled out from a cassette in a device such as a VTR for recording and reproduction, accurate positioning with respect to the device's board is required. Therefore, during such recording and reproduction, that is, when using a cassette, a positioning member attached to the chassis of the apparatus is configured to accurately position the cassette with respect to the apparatus.

At this time, if the degree of freedom of the cassette in the vertical direction with respect to the holder is small, the cassette holder itself also has a depth of 1
It must be positioned in the main body of the device with a corresponding degree of precision, requiring extremely precise machining techniques. In addition, due to this, the holder body must be made of a sturdy material, and the
This was an impediment to weight reduction. i Furthermore, the cassette holder is generally attached to the main body of the device.
；、A position kasu, case, kaaya, □position kasu, 5 kasu
-'1 The engaging part on the holder side, which is biased in the direction of the set insertion position, is locked to the main body of the device.
: must be moved to a position where it passes
□ (referred to as overstroke), the amount of this overstroke also depends on the cassette in the cassette holder mentioned above.
□It is determined by the degree of freedom of the cut, but due to the above-mentioned positional wind control, this overstroke amount should also be small. k 27, zcnzhc'J
O'/9aml! ? ! This also hinders the reduction in weight of the locking mechanism.

In view of the problems typified by the above, the present invention provides a cassette holder that can reliably prevent unauthorized insertion of a cassette, suppress cost increases due to precision machining of various parts of the holder, and reduce weight. The purpose is to

In view of the above-mentioned problems, the present invention provides a protrusion provided on the bottom plate facing the bottom surface of the cassette and a protrusion in the direction of pressing the top surface of the cassette to prevent unauthorized insertion of the cassette. A pressing member that is biased and a movable member that restricts the position of the pressing member relative to the holder in the cassette insertion position and releases the restriction in the cassette use position are provided.

In the above-mentioned configuration, when the holder is in the cassette use position, the degree of freedom of the cassette in the vertical direction within the holder increases, and this reduces the cost increase due to precision machining of each part of the holder. It has become possible to reduce the weight and reduce the weight.

<Examples> Hereinafter, the means taken in the present invention to achieve the above object will be illustrated and explained by examples.

First, a magnetic tape cassette to which an embodiment of the present invention is directed will be explained with reference to FIGS. 2(a) and 2(b). In FIG. 1, the cassette is indicated by 1 in its entirety. 2 is the main body of the cassette set, and 3 is a rotating lid for the tape drawer opening which is rotatably attached to the front of the cassette main body 2 by a shaft 7, usually 7″< f) fl/I ′&* TI
B f ”F WJ it <(7)°'711tK,
EIJ°7′,.

5 is the lock release connected to this lock pawl.
□・Use the removal operation member to attach the cassette to the left side of the cassette body 2. Turn the cassette □ along the insertion direction A from its front end side! ! The insertion side 1, which is formed to a position slightly past the cover 3, and the 0-turn cover 3, which is disposed in the cut groove 2a, have a tip that has descended forward along the insertion direction A of the cassette 1. - Has a pad surface 3a. 4a
and 4b indicate the tape reel, and 6(
FIG. 2(a) shows the gap between the cassette body 2 and M3.

Hereinafter, a cassette holder as an embodiment of the present invention, which is intended for tape cassettes such as the one described above, will be explained as shown in FIG.
) and (b). FIG. 1(a) shows the state of the cassette holder at the tape cassette insertion position,
FIG. 1(b) shows the state of the cassette holder in the position where the tape cassette is used.

In the figure, lO is a cassette holder body, and 11 is a frame fixed to the chassis of a device body such as a VTR.

Reference numeral 12 denotes a positioning member fixed to the chassis for positioning the cassette with respect to the chassis. 13.14
are levers for moving the holder main body 10 from the cassette insertion position to the cassette use position.

One end 13a of the pull/pull 13 is fixed to the frame 11, and the other end 13b is attached to the holder body 10 by moving the convex portion 13c along the opening 10a of the holder body 10.
It is possible to move against. Also, one end 1 of the lever 14
4a is fixed to the holder main body 10, and the other end 14b is movable relative to the frame 11 by moving the convex portion along the opening 11a of the frame 11.

The levers 13 and 14 are also rotatably fixed to each other by a joint 15.

When the holder body lO is moved in the direction of arrow A1 from the state shown in FIG. move in the direction of Although not shown, the holder main body is urged upward in the figure with respect to the frame 11. As a result, the holder main body lO moves from the cassette insertion position to the cassette use position. Furthermore, Figure 1 (
In b), the frame 11 is not shown.

Now, if an attempt is made to incorrectly insert the cassette as shown in the cassette insertion position shown in FIG. comes into contact with.

On the other hand, the upper surface of the cassette 2 is pressed downward by the pressing member 17. The pressing member 17 is attached to the holder body lO by the shaft 19.
The cassette 2 is rotatably attached to the cassette 2, and is biased by a spring 18 in the direction of arrow A4 to press the top surface of the cassette 2 downward.

Further, the convex portion 17a provided on the suppressing member 17 protrudes outward from the elliptical window 10c of the holder main body 10, and when the cassette is inserted, the lever 17a as shown in FIG.
The position is regulated by a hook-shaped portion 13d provided at 3. As a result, even if an attempt is made to insert the cassette 2 incorrectly, this can be reliably prevented by the protrusion 16 and the pressing member 17.

When the cassette 2 is correctly inserted and the cassette holder IO is moved to the cassette use position, the positioning member 12 comes into contact with the lower surface of the cassette 2 through the opening 10b at the bottom of the holder, thereby accurately determining the position of the cassette with respect to the chassis.

At this time, the positional restriction of the pressing member 17 by the aforementioned key-shaped portion 13d is released by the movement of the lever 13, and the pressing member 17 becomes rotatable within the range permitted by the elliptical window.

By configuring as described above, unauthorized insertion of the cassette can be reliably prevented at the cassette insertion position, and the degree of freedom in vertically positioning the cassette 2 with respect to the holder main body 10 is increased at the cassette use position. Therefore, the cassette 2 can be reliably positioned at a predetermined position even if the locking position of the holder lO with respect to the chassis is not very precise. Also, since the overstroke can be increased, the structure of each part of the holder can be simplified and the weight can be reduced.

Reference numeral 20 denotes an upper plate that regulates the direction of insertion of the cassette, and is provided with a warp 20a as shown. This warp is provided to prevent the lid from getting caught on the upper plate 2 and hindering removal if the rotating lid 3 is not completely closed when taking out the cassette.

<Effects of the Invention> As is clear from the embodiments described above, according to the present invention, it is possible to obtain a cassette holder which can reliably prevent unauthorized insertion of a cassette and which can be simplified in structure and reduced in weight.

[Brief explanation of the drawing]

FIG. 1(a) is a diagram showing a state of a cassette holder as an embodiment of the present invention at a cassette insertion position. FIG. 1(b) is a diagram showing the state of the cassette holder as an embodiment of the present invention in the cassette usage position, and FIGS. 2(a) and (b) are the objects of the cassette holder of this embodiment. It is a figure showing a tape cassette. In the figure, 2 is a tape cassette body, 3 is a rotating lid, and 10 is a cassette holder body, loa, 10b. 10c is an opening, 11 is a frame attached to the chassis, 12 is a positioning member, 13 and 14 are rotating levers, 13d is a key-shaped part as a moving member, 15 is a joint, and 16 is provided on the bottom plate of the holder. 17 is a suppressing member, and 20 is an upper plate. Figure 7 (b')

Claims (1)

[Claims] A cassette holder movable between a position for inserting a cassette and a position for using the cassette, the protrusion provided on a bottom plate facing the lower surface of the cassette to prevent unauthorized insertion of the cassette. a pressing member that is biased in a direction to press the top surface of the cassette; and a movable member that restricts the position of the pressing member relative to the holder in the insertion position and releases the restriction in the use position. A cassette holder including a member.