JPH07320449A - Tape casette - Google Patents

Abstract

PURPOSE:To provide a tape casette capable of preventing a tape from slackening even when vibration or impact, etc., occur during transporting the tape cassette. CONSTITUTION:A second reel lock mechanism 13 is provided on the tape winding reel side 4 separately from a reel lock mechanism for reel-locking a tape supplying/winding reel 4. This second reel lock mechanism 13 is composed of a sliding member 14, a spring member 18 for engaging and pressing the pawl part 17 of the tip part of this sliding member 14 with and to the ratchet tooth 4a of the reel 4 and a cam member 20 provided in the rotary shaft 8a of a front lid 8 and engaged with the sliding member 14. The sliding member 14 is moved back and forth by means of the cam member 20 rotated interlocking with the opening and closing operation of the front lid 8 so as to engage with or release from the ratchet tooth 4a of the reel 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette suitable for use in an 8-mm video cassette, and more particularly to a reel lock mechanism for preventing loosening of a tape during transportation of the tape cassette.

[0002]

2. Description of the Related Art Conventionally, in an 8 mm video cassette, when the lid (cassette lid) is closed, the tape supply reel and the tape take-up reel are locked by a single reel lock mechanism to prevent rotation of the tape in the slack direction. Is configured. In the opened state of the lid, that is, in the low dig operation of the tape cassette, the reel lock mechanism releases the lock of the reel, the tape supply reel and the tape take-up reel are rotatable, and the tape can be pulled out.

[0003]

The above-mentioned 8
When the product for the Milli-Video cassette is shipped and vibration or shock occurs during transportation, the tape supply reel and the tape take-up reel receive complicated movements in the cassette housing, and both reels are locked by the reel lock mechanism. It is structurally difficult to maintain, and there is a problem that the tape of the reel that comes off the reel lock mechanism becomes loose.

Therefore, as described above, the tape cassette with loose tape is used as a VTR deck or a camera-integrated VTR.
If set to, the tape may be jammed by the rotating drum or guide pins during loading. Further, when the lid is opened during loading, the tape in the lid portion is lifted while being sandwiched between the front lid and the back lid, which causes tape damage.

The present invention has been made to solve the above problems, and provides a tape cassette capable of preventing loosening of the tape even when vibration, impact, etc. occur during transportation of the tape cassette. The purpose is to

[0006]

In order to achieve the above object, a tape cassette according to the present invention comprises a tape supply reel 3 and a tape winding rotatably housed in a cassette housing composed of an upper half 1 and a lower half 2. The take-up reel 4, the lid 8 that can be opened and closed to protect the tape portion that crosses the mouse portion of the cassette housing, and the rotation of the tape supply reel 3 and the tape take-up reel 4 in the tape slack direction when the lid 8 is closed. In the tape cassette including the reel lock mechanism 9 for blocking, a second reel lock mechanism 13 for blocking at least one reel of the tape supply reel 3 and the tape take-up reel 4 from rotating in the tape slack direction when the lid 8 is closed. Is provided.

In the tape cassette according to the preferred embodiment of the present invention, the second reel lock mechanism 13 includes a slide member 14 and a spring for biasing the tip of the slide member 14 to the ratchet teeth 4a of the reel. The member 18 and a cam member 20 provided on the rotary shaft 8a of the lid 8 and engaged with the slide member 14 are provided.

Further, in the tape cassette according to the preferred embodiment of the present invention, the second reel lock mechanism 13 locks the reel in the winding direction of the tape as the slide member 14 locks the reel when the lid 8 is closed. It is designed to rotate.

[0009]

The tape cassette according to the present invention constructed as described above is the second reel lock for preventing rotation of at least one of the tape supply reel 3 and the tape take-up reel 4 in the tape slack direction when the lid 8 is closed. By providing the mechanism 13, the reel is doubly locked by the two reel lock mechanisms, and the slack of the tape can be almost completely prevented.

The second reel lock mechanism 13 includes a slide member 14 and a spring member 18 for biasing the tip of the slide member 14 to ratchet teeth 19 of the reel.
And a slide member 14 provided on the rotary shaft 8a of the lid 8.
Since the cam member 20 engages with the cam member 20, the cam member 20 retracts the slide member 14 in association with the opening operation of the lid 8, and the slide member 14 is disengaged from the ratchet teeth 4a of the reel to release the reel lock. can do.

When the lid 8 is closed, the cam member 20 separates from the slide member 14 so that the slide member 14
Is engaged with the ratchet teeth 4a of the reel by the spring biasing force of the spring member 18, and the reel can be locked.

Further, since the second reel lock mechanism 13 is adapted to rotate the reel in the tape winding direction together with the reel locking operation by the slide member 14 when the lid 8 is closed, the slack of the tape is removed. You can

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tape cassette according to the present invention will be described below with reference to the drawings by taking an 8 mm video cassette as an example. FIG. 1 is a plan view showing a state in which the upper half of the tape cassette is removed.

First, the overall structure of the tape cassette will be described with reference to FIG. A tape supply reel 3 and a tape take-up reel 4 are rotatably housed in a lower half 2 which is united with the upper half 1. Tape supply reel 3
The tape T drawn out from the tape traverses the mouse portion 6 via one tape guide 5 and is wound on the tape winding reel 4 via the other tape guide 7. The mouth portion 6 can be opened and closed by a front lid 8 supported on the upper half 1 by a rotary shaft 8a, and protects the tape T that traverses the mouth portion 6 when the lid 8 is closed.

Further, the tape supply reel 3 and the tape take-up reel 4 are locked by the reel lock mechanism 9 so as to lock the rotation in the tape slack direction. More specifically, the reel lock mechanism 9 has a pair of lock claws 11 and 11 on the main body 10, and the lock claws 11 and 11 are moved to the tape supply reel 3 and the tape by the spring force of the spring 12 biased via the main body 10. Ratchet teeth 3 on each lower flange of take-up reel 4
It is engaged with a and 4a to prevent rotation in the tape slack direction. The reel lock mechanism 9 can retract the reels 3 and 4 by retracting the main body portion 10 by inserting a pin from a window hole (not shown) opened in the lower half 2.

In addition to the reel lock mechanism 9 described above, a second reel lock mechanism 13 is arranged in the present invention. Hereinafter, an example in which the configuration of the second reel lock mechanism 13 is provided on the tape take-up reel 4 side will be described with reference to FIGS. 2 and 3. 2 is a plan view of the second reel lock mechanism 13, FIG. 3 is a side view of the same, and FIG. 4 is an exploded perspective view of essential parts.

In each drawing, a slide member 14 is provided on the inner surface of the lower half 2 near the tape guide 7. The slide member 14 is supported by a guide rib 15 provided on the lower half 2 at its side surface and a guide rib 16 provided on the upper half 1 at its upper surface so as to be movable back and forth. Then, the slide member 14 has a claw piece 17 at its tip.
One end of the spring member 18 is fixed to the base end 14a, and the other end of the spring member 18 is fixed to the fixing piece 2a of the lower half 2. As a result, the slide member 14 is spring-biased by the spring member 18 to engage the pawl piece 17 with the ratchet teeth 19 of the tape take-up reel 4 and lock the rotation of the reel 4 in the tape slack direction.

On the other hand, the rotary shaft 8a of the front lid 8 supported by the upper half 1 projects into the lower half 2 and the cam member 20 is fixed to the rotary shaft 8a. Cam member 2
0 is arranged so as to correspond to the operating surface 21 provided on the slide member 14.

In the second reel lock mechanism 13 thus constructed, the state shown in FIGS. 2 and 3 is the reel lock operation position. In this operation state, the front lid 8 is closed and the cam member 20 is closed. Operating surface 2 of slide member 14
1 and thus the slide member 14 is
By the spring force of 8, the claw pieces 17 at the tip end are engaged with the ratchet teeth 4a of the tape take-up reel 4 and are in the reel lock state. Further, when the front lid 8 is closed, both reels 3 and 4 are in the reel lock state by the original reel lock mechanism 9.

Thus, when the flot lid 8 is opened during the loading operation of the tape cassette, the cam member 20 is rotated via the rotation shaft 8a in conjunction with the rotation operation of the front lid 8. As the cam member 20 rotates, the cam member 20 moves to the operating surface 21 of the slide member 14.
The slide member 14 moves back against the spring member 18 by contacting with and pressing against the ratchet teeth 4a.
And the reel is unlocked. The unlocked position of this reel is shown in FIGS. In the loading state of the tape cassette, both reels 3 and 4 are unlocked by the original reel lock mechanism 9.

When the tape cassette is unloaded, the front lid 8 is closed and the cam member 20 is also rotated, so that the slide member 14 is separated from the operating surface 21 by the spring force of the spring member 18 again. 2 and 3 as the pawl piece 17 moves forward and engages with the ratchet teeth 4a.
The reel is locked as shown in. Here, it is important to note that when the pawl piece 17 is engaged with the ratchet teeth 19, the reel can be rotated in the tape winding direction by the stroke of the slide member 14, so that the tape generated in the mouse portion can be rotated. Can take up the slack.

As described above, in the tape cassette of the present invention, the tape slack preventing operation can be performed by the second reel lock mechanism 13 together with the original reel lock mechanism 9 as a tape slack preventing operation. As a result, the probability that the reel lock will be released due to vibration or shock during transportation of the tape cassette is extremely small, and the tape damage due to the looseness of the tape during the loading operation can be avoided. There is.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

Although the second reel lock mechanism 13 is provided on the tape take-up reel 4 side in the embodiment, it may be provided on the tape supply reel 3 side. Of course, the second reel lock mechanism 13 may be provided on the tape supply reel 3 side. Lock mechanism 13 to both reels 3,
4 may be provided respectively.

Further, in the embodiment, the case where it is applied to the cassette for 8 mm video has been described, but it can be widely used for the tape cassette of the VHS system or the beta system.

[0026]

As described above, in the tape cassette according to the present invention, the second reel lock mechanism for preventing at least one of the tape supply reel and the tape take-up reel from rotating in the tape slack direction when the lid is closed. Since the reel is double-locked by the two reel lock mechanisms, the slack of the tape can be almost completely prevented even if vibration or shock occurs during transportation of the tape cassette. Therefore, there is an effect that it is possible to prevent jamming of the tape and other damages to the tape during the loading operation, and the tape cassette has high reliability.

The second reel lock mechanism includes a slide member, a spring member for biasing the tip of the slide member to the ratchet teeth of the reel, and a slide member provided on the rotary shaft of the lid. With the cam member, the reel can be easily locked and unlocked in conjunction with the opening / closing operation of the lid.

Further, since the second reel lock mechanism rotates the reel in the tape winding direction together with the reel locking operation by the slide member when the lid is closed, the tape slack can be removed. It is possible to prevent tape damage such as tape jamming.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which an upper half of a tape cassette of this example is removed.

FIG. 2 is a plan view of a reel lock state of a second lid lock mechanism.

FIG. 3 is a side view of a second lid lock mechanism in a reel locked state.

FIG. 4 is an exploded perspective view of a second lid lock mechanism.

FIG. 5 is a plan view of a reel lock release state of a second lid lock mechanism.

FIG. 6 is a side view of a reel lock release state of a second lid lock mechanism.

[Explanation of symbols]

 1 upper half 2 lower half 3 tape supply reel 4 tape take-up reel 3a, 4a ratchet teeth 8 front lid 8a rotating shaft 9 reel lock mechanism 13 second reel lock mechanism 14 slide member 15, 16 guide rib 17 claw piece 18 spring member 20 cam member 21 working surface

Claims (3)

[Claims] 1. A tape supply reel and a tape take-up reel rotatably accommodated in a cassette housing composed of an upper half and a lower half, and an opening / closing operation for protecting a tape portion traversing a mouse portion of the cassette housing. With the lid of
A tape cassette provided with a reel lock mechanism for preventing rotation of the tape supply reel and the tape take-up reel in a tape slack direction when the lid is closed, at least the tape supply reel or the tape take-up reel when the lid is closed. A tape cassette comprising a second reel lock mechanism for preventing one reel from rotating in a tape slack direction. 2. The second reel lock mechanism comprises a slide member, a spring member for biasing the tip of the slide member to ratchet teeth of the reel, and a slide shaft provided on the rotary shaft of the lid. A cam member that engages with a member, and the cam member that rotates in conjunction with opening and closing of the lid causes the slide member to advance and retract, and engages and disengages with the ratchet teeth of the reel. The tape cassette according to claim 1, wherein the tape cassette is formed. 3. The second reel lock mechanism is configured to rotate the reel in the tape winding direction in accordance with the reel locking operation by the slide member during the closing operation of the lid. Item 2. The tape cassette according to item 2.