JPH1139828A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and surely operate a reel lock member without being separated when sliding by providing the reel lock member with at least one pin extending in a slide direction and setting a reception means for receiving the pin slidably at a rear wall face of a cassette half. SOLUTION: In a reel lock member 10, pins 15, 16 are accepted at pin holes 19, 20 of a receiving part 2a, and therefore the pins 15, 16 and pin holes 19, 20 constitute a constrained kinematic pair with a degree of freedom of 1. As a result, the reel lock member 10 is slidable only in a reel lock direction and a lock release direction as shown by an arrow A, not loosely moving to an upper cassette half when sliding. The reel rock member is held stably. A triangular prism stopper 22 is set in front of the reel lock member 10 to limit a forward movement amount of the reel lock member 10. While the reel lock member 10 butts to the stopper, engagement hooks 13, 14 are engaged with engagement threads 7, 8 and therefore reels 4, 5 are surely prevented from rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette having a reel lock member which engages with a flange of a reel on which a magnetic tape is wound to prevent rotation of the reel.

[0002]

2. Description of the Related Art There are various types of conventional magnetic tape cassettes. For example, a magnetic tape cassette 50 as shown in FIG.
A pair of reels 62 and 63 are rotatably disposed in the figure (the upper cassette half is removed), and a magnetic tape 64 is wound around the two reels 62 and 63.

The magnetic tape 64 is guided by tape guides 65 and 66 on the front and left and right sides of the cassette (upper side in FIG. 3).
7. And the reel 62,
Engaging teeth 70, 71 are formed on the entire periphery of the lower flanges 68, 69 of the 63.

On the other hand, when the magnetic tape cassette 6 is not loaded in a recording / reproducing apparatus (not shown), that is, when the cassette is stored or carried, the magnetic tape 64 is prevented from being loosened. And reel 6
A reel lock member 72 for preventing the rotation of the reels 2 and 63 is provided.

A substantially triangular rib 90, 91 is provided between the rear plate 74 of the lower cassette half 61 and the reels 62, 63.
Is provided. The straight portions 7 of these ribs 90, 91
The reel lock member 72 is slidably inserted between the linear portions 75 and 76.

The reel lock member 72 is biased toward the front of the cassette by the biasing force of a torsion coil spring 78 (brake spring) appropriately supported by a support shaft 73 projecting from the bottom surface of the lower cassette half 61. . This torsion coil spring 78 has its coil portion penetrated through the support shaft 73,
One end is engaged with a part of the rib 90 and the other end is engaged with a rear surface of the reel lock member 72. An insertion hole 79 for inserting an unlocking pin of the recording / reproducing apparatus is provided on the bottom surface of the reel lock member 72. An opening (not shown) corresponding to the insertion hole 79 of the reel lock member 72 is provided on the bottom wall of the lower cassette half 61.

The reel lock member 72 is formed of, for example, a resin having an appropriate elasticity, and is provided with a rectangular slide body 81 having a relatively large bottom area for stable sliding. On the front end surface of the slide body 81, locking claws 82, 83 which can be engaged with the engaging teeth 70, 71 of the reels 62, 63 are integrally formed.

[0008]

However, the reel lock member 72 having the above-described structure is provided with the rib 9
Since only the position is restricted in the horizontal direction by the linear portions 75 and 76 of 0 and 91, there is a possibility that the movable portion moves to the upper cassette half side and separates from the track. As a result, this has been a cause of failure, failure, and the like of the magnetic tape. Therefore, an object of the present invention is to solve the above-described problems, and to provide a magnetic tape cassette including a reel lock member capable of preventing detachment.

[0009]

An object of the present invention is to provide a pair of reels rotatably mounted by winding a magnetic tape around upper and lower cassette halves, and a reel rotating by engaging a flange of the reel. A reel lock member for preventing movement of the lower cassette half between a reel lock position and a reel lock release position at which the reel lock member retreats from the reel lock position and is disengaged from the flange. In a magnetic tape cassette slidable on the upper side and urged in the direction of a reel lock position by elastic means, the reel lock member has at least one pin extending along a sliding direction, The rear surface of the cassette half is provided with a receiving means for slidably receiving the pin of the reel lock member. Tsu be solved by the door.

According to the present invention, the reel lock member has at least one pin extending in the sliding direction, and the pin of the reel lock member is slidably received on the rear wall surface of the cassette half. Since the receiving means is provided, when the reel lock member slides by the pin and the receiving means, the reel lock member is stably held without floating on the upper cassette half side. Therefore, the reel lock member does not separate from the track when sliding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view of a main part of a magnetic tape cassette according to an embodiment of the present invention. FIG.
As shown in FIG.
A pair of reels 4 and 5 are rotatably arranged in a lower cassette half 2 (the figure shows a state where the upper cassette half is removed), and a magnetic tape (not shown) is mounted on the reels 4 and 5.
Is wound. Engaging teeth 7 and 8 are formed all around the lower flange peripheral edges of the reels 4 and 5.

When the magnetic tape cassette 1 is not loaded in a recording / reproducing apparatus (not shown), a reel lock member 10 for preventing rotation of the reels 4 and 5 is arranged to prevent the magnetic tape from being loosened. ing. Reel lock member 1
0 is a lower cassette half between a reel lock position where rotation of the reels 4 and 5 is prevented and a reel lock release position where the reel 4 is retracted from the reel lock position and the engagement with the flanges of the reels 4 and 5 is released. 2 can be slid. The operation of each part other than the reel lock member 10 is the same as that of the conventional magnetic tape cassette 50 described with reference to FIG. 3, and the description is omitted here.

FIG. 2 is a perspective view of the reel lock member 10, the compression coil spring 17, and the lower cassette half 2. FIG.
As shown in FIG. 2, the reel lock member 10 has a slide body 12 slidably disposed between the reels 4 and 5.
Locking claw 1 provided on one end surface of slide body 12
3 and 14 and columnar pins 15 and 16 provided on the other end surface of the slide body 12 and extending along the sliding direction. The locking claws 13, 14 can be engaged with the engaging teeth 7, 8 of the reels 4, 5. The pins 15 and 16 are slidably received in pin holes 19 and 20 of a receiving portion 2a as receiving means provided on the rear wall surface of the lower cassette half 2. Here, the pin holes 19 and 20 are formed as through holes in consideration of formability. The compression coil spring 1 is an elastic means for urging the reel lock member 10 in the direction of the reel lock position.
7 is provided so as to surround the pins 15 and 16.

In front of the reel lock member 10, a triangular prism-shaped stopper 22 for regulating the amount of forward movement of the reel lock member 10 is provided. Reel lock member 1
0 is in contact with the stopper 22, the locking claws 13, 1
4 is securely inserted between the engaging teeth 7 and 8, and the reels 4 and 5
Is reliably prevented from rotating.

In the reel lock member 10 having the above-described structure, the pins 15 and 16 are provided in the pin holes 19 and 19 of the receiving portion 2a.
20, the pins 15, 16 and the pin hole 1
9 and 20 form a limited pair, and the degree of freedom is 1.
Therefore, the reel lock member 10 can be slid only in the reel lock direction and the release direction as shown by the arrow A in FIG. 1, and when the reel lock member 72 slides, it does not move to the upper cassette half side and is stable. Will be held.

Incidentally, the reel lock member is not limited to the above-mentioned shape, but can be appropriately changed. For example, the reel lock member may be provided with at least one pin instead of two pins. In this case, by making the pin and the pin hole into a prismatic shape, the rotation of the reel lock member can be prevented even with a single pin.

[0017]

As described above, in the magnetic tape cassette of the present invention, the reel lock member has at least one pin extending along the sliding direction, and the reel lock member is provided on the rear wall surface of the cassette half. Since the receiving means for slidably receiving the pin is provided, when the reel lock member slides by the pin and the receiving means, the reel lock member is stably held without floating to the upper cassette half side. Is done. Therefore, the reel lock member does not separate from the track when sliding.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a magnetic tape cassette according to an embodiment of the present invention.

FIG. 2 is a perspective view of a reel lock member, a compression coil spring, and a lower cassette half according to an embodiment of the present invention.

FIG. 3 shows the internal structure of a conventional magnetic tape cassette.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape cassette 2 Lower cassette half 2a Reception part 4,5 Reel 7,8 Engagement tooth 10 Reel lock member 12 Slide body part 13,14 Engagement claw 15,16 Pin 19,20 Pin hole 50 Magnetic tape cassette 61 Lower Cassette half 62, 63 Reel 64 Magnetic tape 65, 66 Tape guide 67 Opening 68, 69 Lower flange 70, 71 Engaging tooth 72 Reel lock member 73 Support shaft 74 Rear plate part 75, 76 Linear part 78 Coil spring 79 Insertion hole 81 Slide body 82,83 Locking claw 90,91 Rib

Claims (1)

[Claims] A pair of reels rotatably mounted by winding a magnetic tape around upper and lower cassette halves; and a reel lock member that engages with a flange of the reel to prevent rotation of the reels. The reel lock member is slidable on the lower cassette half between a reel lock position and a reel lock release position where the reel lock member is retracted from the reel lock position and disengaged from the flange. In the magnetic tape cassette biased in the direction of the reel lock position, the reel lock member has at least one pin extending along a sliding direction, and the reel lock member is provided on a rear wall surface of the cassette half. A receiving means for slidably receiving the pin.