JPH0743909B2 - Magnetic tape cassette - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front cover structure for protecting a tape of a magnetic tape cassette, and more particularly to a magnetic tape suitable for simplifying the opening operation of the front opening of the cassette. It is about cassettes.

[Conventional technology]

As described in Japanese Utility Model Laid-Open No. 51-74417, in the conventional structure, in order to protect the magnetic tape and protect it from dust, the exposure operation of the front and bottom openings is performed by rotating the front lid and rotating the lower lid. It was supposed to be done by sliding.

[Problems to be solved by the invention]

In the above-mentioned prior art, the front and bottom openings of the cassette need to be exposed in two steps, namely, the front lid rotating operation and the lower lid sliding operation. Therefore, the cassette loading mechanism is simplified. No, a small mechanical,
It was a harmful effect of weight reduction. In addition, when the slack of the magnetic tape occurs, no consideration has been given to the problem that the magnetic tape is pinched by the opening / closing operation of the front lid or the lower lid for protection against dust.

SUMMARY OF THE INVENTION An object of the present invention is to simplify the cassette loading mechanism by simplifying the operation of exposing the front opening of the cassette, to reduce the size and weight of the cassette, and to improve the opening / closing function of the lid securely without the magnetic tape being caught.

[Means for solving problems]

The purpose of the above is to expose the bottom opening of the cassette by sliding the cassette front frame near the front of the cassette back and forth, and rotate the cassette front lid in conjunction with the front frame to open and close the front lid to open the front surface of the cassette. This is achieved by exposing or covering the opening.

[Action]

When the cassette is inserted into the cassette box, the cassette front frame is pushed rearward of the cassette to perform a sliding operation. By sliding the cassette front frame, the cassette front frame is rotated and supported by the cassette front frame, and is pushed up to the front face of the cassette and rotated until it becomes horizontal.The cassette front frame is also provided with guide members on both sides of the cassette. By pushing backward to the end of the frame guide groove, the cassette front opening and the bottom opening are exposed, and the preparation for inserting the tape guide member into the bottom opening is completed.

When the cassette is taken out from the cassette box, the cassette front frame is pushed back by the return spring, and the cassette front lid is rotated until it is in the vertical state, covering the cassette front opening and the magnetic tape with the far winding. The protection and dust protection of the tape are completed without damaging the magnetic tape without damaging it.

〔Example〕

 Examples of the present invention will be described below.

FIG. 1 is a perspective view of an embodiment according to the present invention before insertion of a cassette box (stored state).

1 is a magnetic tape cassette, 2 and 3 are supply, take-up reel flanges, 4 is a cassette front frame, 5 is a cassette front cover, 6 is a cassette front frame guide member, 7 is a cassette front frame guide groove , 8 are relief grooves such as springs, 9 and 10 are magnetic tape entry / exit holes, 11 is
Front frame return spring, 12 is spring locking member, 13 is
It shows a front lid return spring. Cassette front frame 4
Can move (slide) in the A and B directions with respect to the cassette 1, and the cassette front frame 4 can be moved by the cassette front frame guide members 6 into the cassette front frame guide grooves provided on both sides of the cassette 1. The slide operation is performed by being supported and guided by 7. As shown in the figure, the cassette front frame 4 is biased in the B direction by the front frame return spring 11 in a state before the cassette box is inserted, and the cassette front frame guide member 6 is pushed in the B direction to the foremost part of the cassette front frame guide groove 7. The cassette front lid 5 is applied,
It is pivotally supported and fixed to the cassette front frame 4, and the return spring 13 covers the front surface of the cassette 1 by pressing it to protect the front surface of the cassette and the tape in the opening of the bottom surface to protect it from dust.

2 and 3 are plan views showing the exposing operation of the front opening of the cassette, in which 51 is a cassette box and 52 is a front frame drive surface. FIG. 2 is a view showing that the cassette 1 is inserted into the cassette box 51 in the B direction, and the cassette front frame 4 is inserted from the time when the cassette front frame 4 contacts the front frame drive surface 52 by continuing the insertion in the B direction. The operation in the direction A starts for the cassette 1 of 4. FIG. 3 is a diagram in which the inserting operation of the cassette 1 in the cassette box 51 in the B direction and the operating operation of the cassette front frame 4 in the A direction are completed, and a portion indicated by cross hatching is a front opening portion of the cassette 1.

4 to 6 are side views showing the exposing operation of the front opening of the cassette. 4 is a cassette front frame, 5 is a cassette front lid, 8 is a relief groove, 13 is a front lid return spring. Reference numerals 39 denote front cover rotation support fixed shafts, and reference numeral 53 denotes a cassette R portion (slope may be used). If the cassette 1 is continuously inserted into the cassette box as described with reference to FIGS.
From the state shown in the figure, the cassette front lid 5 is urged in the direction C by the front lid return spring 13 to cover the front surface of the cassette 1 from the state shown in FIG. 5 to the state shown in FIG. Slide in the direction A against the cassette front lid 5
Is pushed by the cassette R portion 53 of the cassette 1 and performs a long-distance rotation operation in the D direction around the front lid rotation support fixed shaft 39, and the cassette front lid 5 is in a substantially horizontal state as shown in FIG. Up to At this time, since the cassette front lid 5 also closes the front opening of the cassette 1 in the direction C, the cassette front lid 5 is closed by a long rotation, so that there is no risk of the magnetic tape 15 being pinched and damaged. During the sliding operation in the A direction, the escape groove 8 is escaped so that the movement of the front lid return spring 13 and the like cannot be prevented.

FIG. 7 is a perspective view of the cassette showing the completion of the exposing operation of the front and bottom openings of the cassette, in which 14 is a tape end detection window and 15 is a magnetic tape. Cassette front frame 4
Has completed the operation in the direction A with respect to the cassette 1, and the cassette front lid 5 has been opened to a horizontal state. At this point, the tape guide member (not shown) can be inserted into the cassette bottom opening from below.

FIGS. 8 and 9 are plan sectional views of the cassette, wherein 16 and 17 are cassette positioning holes, 18 is a tape end detection light emitting hole, 19 is a tape end detection passage hole, 21- a,
b, 22-a and b are reel lock members, 23 and 24 are lock rotation support fixing members, 25 and 26 are lock spring receivers, 27 and 28 are
Rock drive springs, 29, 30 are reel hub racks, 31
Is an error recording detection hole, 32 is an error recording prevention valve, 33, 34, 35, 36 are recognition holes, and 37, 38 are supply and take-up reel hubs. When the cassette front frame guide member 7 is supported by the cassette front frame guide groove 8 in FIG. 8 and the rearward sliding of the cassette 1 is completed as shown in FIG. 9, the tape guide shown by class hatching is shown. The front and bottom openings of the cassette 1 into which the member is inserted are exposed. Further, FIG. 8 shows a state in which the reel hub racks 29, 30 are locked by the reel lock members 21, 22, but FIG. 9 shows a state in which the locks are released, and this operation causes the magnetic tape 15 to move to the front of the cassette 1, Also, it is possible to pull out from the bottom opening. Regarding reel lock and unlocking,
The explanation will be made with reference to the plan sectional views of the drawings and the side sectional views of FIGS.

FIG. 10 shows that the upper half is in the reel lock state and corresponds to FIG. 11, and the lower half is in the reel lock released state.
Corresponds to the figure. 45 and 46 are lock spring drive pins, 47
Reference numerals -a and b are drive pins, 48-a and b are slide members, 49 is a slide support member, and 50-a and b are slide springs. In the upper half of FIG. 10, the reel lock member 21 meshes with the reel hub rack 29 provided on the supply reel hub 37 by the restoring force of the lock drive spring 27, and the supply reel hub.
37 indicates a locked state. Lower half of Fig. 10 and 12
The figure shows that the drive pin located in the upper half of FIG. 10 and the position 47-a in FIG. 11 moves to the position 47-b,
The slide member at the position 48-a moves to the position 48-b while being supported by the slide support member 49 from both sides, and rotates the reel lock member 22-b to separate it from the take-up reel hub 38. The reel lock is released. Drive pin 47
In the state where the driving force by -a, b is not applied, the slide springs 50-a, b cause the slide members 48-a, b to return to the upper half of FIG. 10 and the state of FIG. 11 so that the reel is always locked. Therefore, the operation can be reliably performed, and the slack of the magnetic tape does not occur.

13 and 14 are plan views seen from the back of the cassette, in which 53 is a relief R, which is a portion of the cassette front frame 4 where the supply and take-up reel hubs 37, 38 escape. Is. In FIG. 13, the cassette front lid 5 covers the front surface of the cassette 1, the cassette front frame 4 covers the tape end detection light emitting hole 18 and the cassette positioning holes 16 and 17, and the cassette box insertion of the cassette 1 is performed. By the operation, the cassette front frame 4 slides in the A direction with respect to the cassette 1. FIG. 14 shows a diagram in which the sliding operation in the A direction is completed.
Tape end detection light emitting hole covered by cassette front frame 4
18, the cassette positioning holes 16 and 17 are exposed, and the front and bottom openings of the cassette 1, which are exposed from the outside by the cassette front frame 4 and the cassette front lid 5, are exposed. The portion indicated by cross-hatching is a space (front surface of cassette and bottom opening portion) used for drawing out the magnetic tape 15 by the tape guide member.

15 and 16 are perspective views showing another embodiment according to the present invention, in which 40 is a cassette front lid B, 41, and escape grooves B, 42 are
The front lid return spring B, 43 is the front frame return spring B, 44
Shows a spring locking member B. In FIG. 15, the cassette front frame 4 is similar to that described in FIG.
It can be moved (slide) in the A and B directions, and the cassette front frame 4 is supported by a cassette front frame guide member 6 in a cassette front frame guide groove 7 provided in the cassette 1 to perform a sliding operation. As shown in the figure, the cassette front frame 4 is biased by the front frame return spring B43 in a state before the cassette box is inserted, and the cassette front frame guide member 6 is pushed in the B direction to the frontmost position of the cassette front frame guide groove 7. The cassette front cover 5 and the cassette front cover B40 are pressed against the front surface of the cassette 1 to cover and cover the front surface of the cassette and the tape in the opening of the bottom surface to protect them from dust. FIG. 16 is a perspective view showing the completion of the exposing operation of the front and bottom openings of the cassette, as in the case described with reference to FIG.
Is a magnetic tape. The cassette front frame 4 is a cassette 1
The operation in the A direction has been completed, and the cassette front lid 5 and the cassette front lid B40 have been opened to the horizontal state, at which point the tape guide member can be inserted into the cassette bottom opening from below. .

〔The invention's effect〕

According to the present invention, since the cassette front opening can be exposed only by sliding the frame near the cassette front and back, the cassette loading mechanism on the reel stand can be simplified and the mechanism can be made compact and lightweight. In addition, the magnetic tape can be prevented from being damaged by being caught by the cassette front cover or the like, and the magnetic tape can be protected and dust can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention, FIGS. 2 and 3 are plan views showing an operating state, and FIGS. 4, 5, and 6 are side views showing the operating state. FIG. 7 is a perspective view showing the state after the operation is completed, FIGS. 8 and 9 are plan sectional views of the cassette, and FIGS. 10 to 12 are plane and side sectional views showing the reel lock state. 13 and 14 are plan views of the back of the cassette, and FIGS. 15 and 16 are perspective views showing before and after the operation of another embodiment according to the present invention. 1 ... Magnetic tape cassette 2, 3 ... Supply, take-up reel stand 4 ... Cassette front frame 5 ... Cassette front lid 6 ... Cassette front frame guide member 7 ... Cassette front frame guide groove 14 ... Tape End detection window 15 ... Magnetic tape 29,30 ... Reel bubble 21,22 ... Reel lock member 48-a, b ... Slide member 47-a, b ... Drive pin

Claims (1)

[Claims] 1. A magnetic tape cassette for holding, storing and protecting a supply reel and a take-up reel around which a magnetic tape is wound, and a front frame which is slidable forward and backward in the vicinity of the front face of the cassette and the cassette which is rotatably attached to the front frame. A magnetic tape cassette characterized in that a front lid for covering the front surface is provided, and the front opening portion and the bottom opening portion of the cassette are exposed by sliding operation of the front frame.