JPH0244375Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a videotape recorder (hereinafter referred to as VTR).
The present invention relates to a device for preventing incorrect insertion of a video cassette, and more particularly to a device suitable for preventing the video cassette from being inserted from the side in a front loading type VHS system. (b) Conventional example In general, most VTRs using video cassettes, that is, beta system and VHS system VTRs, do not have measures to prevent insertion in an abnormal direction, that is, horizontal insertion of the video cassette. Video cassettes have small front corner chamfers, and the method of detecting this is difficult considering variations in the dimensions of the video cassettes.Currently, there are no VCRs equipped with a device to prevent incorrect insertion. If it is inserted incorrectly, the guide post or cylinder head of the VTR may be damaged. (c) Purpose of the invention This invention is particularly useful for cassette-type VTRs.
In a VHS system VTR, even if a video cassette is inserted incorrectly, that is, if an attempt is made to insert it laterally, the cassette stage is prevented from being inserted in the back direction, and the guide post and cylinder head are prevented from being damaged due to incorrect insertion of the video cassette as in the past. The present invention provides a novel video cassette insertion prevention device. (d) Structure of the invention The present invention prevents incorrect insertion between a pair of guide pieces separated by a distance longer than the depth of the cassette on the upper surface of a cassette stage that receives and holds a video cassette. A blocking piece is provided, and when the video cassette is erroneously inserted, the erroneous insertion preventing piece prevents the video cassette from being inserted into the back. (E) Embodiment The drawings are all perspective views of the essential parts of the device for preventing incorrect insertion of a video cassette according to the present invention, and FIG. 1 shows the video cassette inserted in the normal direction, and FIG. Inserted from the wrong direction, 3rd
The figures are perspective views of the cassette in a state where it has been incorrectly inserted from the left side. Next, referring to the drawings, 1 is a video cassette consisting of a cassette body 2 and a cassette lid 3;
Reference numeral 4 denotes a cassette stage having a top plate 5, a cassette stage having tools 6 and 6' for preventing incorrect cassette insertion, and guide pieces 7, 7', 8, 8' and 9 provided on the tool 6 for preventing incorrect cassette insertion, respectively. , shows the incorrect insertion prevention piece and the support shaft. Now, as shown in FIG. 1, when the video cassette 1 is inserted from the normal direction, that is, the front direction, with the cassette lid 3 side first, the pair of guide pieces 7, 7' exert a biasing force in the direction of the arrow A (in this embodiment, the cassette The cassette cassette 1 contacts the top plate of the video cassette 1 against its own gravity), and the cassette erroneous insertion preventers 6 and 6' rotate clockwise, allowing the video cassette 1 to be smoothly inserted into the back. be exposed. At this time, video cassette 1
The cassette lid 3 is opened counterclockwise in FIG. 1 by a lid opening means (not shown), and the video cassette 1 is stored in the cassette stage 4 with the magnetic tape exposed. The cassette loading operation ends. However, as shown in Figs. 2 and 3, when the video cassette 1 is inserted laterally (inserted from the side), the state shown in Fig. 2 (when inserted from the right side) first occurs.
As shown in the figure, the guide piece 7 at the left end of the cassette erroneous insertion prevention tool 6 is rotated clockwise by the bent portion at the tip of the guide piece 6, so that it does not prevent the video cassette 1 from being inserted into the back. The guide piece 7' at the right end of the erroneous insertion prevention tool 6 does not come into contact with the top surface of the video cassette 1 and remains biased counterclockwise, so that the cassette erroneous insertion prevention tool 6
The tip of the erroneous insertion prevention piece 8 abuts against the side wall of the video cassette 1 , and the video cassette 1 is not inserted deeper than the state shown in FIG. In addition, in the state shown in FIG. 3 (when inserted in the left direction), the guide piece 7' at the right end of the cassette erroneous insertion prevention tool 6 is rotated clockwise by the bent portion at the tip of the guide piece 7' as shown in the figure. The video cassette 1 rotates and does not prevent the video cassette 1 from being inserted into the back, but the guide piece 7 at the left end of the erroneous insertion prevention tool 6' does not come into contact with the top surface of the video cassette 1 and remains biased counterclockwise. 2, the tip of the erroneous insertion prevention piece 8' of the cassette erroneous insertion prevention device 6' comes into contact with the side wall of the video cassette, as shown in FIG. It is never inserted in direction B). Here, if the depth of the video cassette 1 is l, and the distance between the guide pieces is d, then l<d.
If the video cassette 1 is erroneously inserted into the cassette stage 4 , the side surface of the video cassette 1 will always come into contact with the erroneous insertion prevention piece 8 or 8', so that erroneous insertion of the video cassette can be prevented. Note that biasing of the cassette erroneous insertion prevention device in the direction A' in FIG. 1 may be performed using a separate spring. (f) Effects of the invention According to the video cassette erroneous insertion prevention device of the present invention, the erroneous insertion prevention piece of the video cassette erroneous insertion prevention device provided on the top plate of the cassette stage prevents the cassette from being erroneously inserted horizontally with respect to the cassette stage. When a video cassette is inserted in this direction, the blocking piece comes into contact with the video cassette to prevent it from being inserted to the back, thereby preventing damage to the guide pole, cylinder head, etc. that previously occurred. It is possible.

[Brief explanation of the drawing]

Each of the drawings shows a perspective view of the essential parts of the device for preventing incorrect insertion of a video cassette according to the present invention. Fig. 1 is a perspective view of the video cassette inserted in the normal direction, and Figs. 2 and 3 are views showing the device when the video cassette is inserted incorrectly. FIG. Explanation of main drawing numbers: 1 ...Video cassette, 2...
...Cassette body, 3...Cassette lid, 4 ...Cassette stage, 5...Top plate, 6, 6'...Incorrect insertion prevention device, 7,7'...Guide piece, 8,8'...Incorrect insertion blocking piece.

Claims (1)

[Scope of claim for utility model registration] Cassette stage 4 forming a cassette insertion slot
a pair of erroneous insertion prevention tools 6, which are pivotally supported on the top plate 5;
6', erroneous insertion prevention pieces 8, 8' whose tips are positioned below the top surface of the cassette; and erroneous insertion prevention pieces 8, 8', which are formed integrally on the outside of each of the erroneous insertion prevention pieces 8, 8', and whose bent tips are placed at the upper end of the cassette. It is composed of guide pieces 7, 7' that guide the tips of the incorrect insertion prevention pieces 8, 8' to a position higher than the top surface of the cassette by coming into contact with the cassette. A device for preventing incorrect insertion of a video cassette, characterized in that the short side is set longer than the first short side.