JPH0427019Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic tape cassette such as a video cassette tape.

[Conventional technology]

Generally, in a video tape cassette, as shown in FIGS. 2 and 3, a supply reel 3 of magnetic tape 2 is rotatably stored in the cassette body 1 on the right side, and a take-up reel 4 is rotatably stored on the left side. The magnetic tape 2 is guided by guide rollers 5, 6 and tape guides 7, 8 provided on the cassette main body 1, and the magnetic tape 2 is fed out to the outside of the front of the cassette main body 1, and is supplied when the tape is not installed in a VTR device. In order to prevent the magnetic tape 2 from loosening due to rotation of the reel 3 and take-up reel 4, the reels 3 and 4 are engaged with the outer peripheries of the supply reel 3 and take-up reel 4, respectively.
a pair of reel lock levers 9,
10 is connected to a pin 11 installed upright near the supply reel 3 of the cassette body 1 and the take-up reel 4 of the cassette body 1.
They are each rotatably provided to a pin 12 standing upright nearby. Further, a release lever 13 is disposed between both reel lock levers 9 and 10 of the cassette body 1.

A reel lock lever 9 that prevents rotation of the supply reel 3 has a pair of arms 9b and 9c protruding from a cylindrical portion 9a that is rotatably supported by a pin 11. Flange 3 of supply reel 3 at the tip
A claw portion 9 that meshes with a tooth portion 3b formed on the outer periphery of a.
d is provided as an engaging arm, the other arm 9c is brought into contact with the release lever 13 and serves as an operating arm, and one end of the torsion spring 14 provided on the pin 11 is hooked on the hooking portion 9e of the engaging arm 9b. At the same time, the engaging arm 9b is urged to engage with the teeth 3b of the supply reel 3, and the working arm 9c is pushed by the release lever 13, thereby rotating the reel lock lever 9. The claw portion 9d is then engaged with and disengaged from the tooth portion 3b of the supply reel 3.

Similarly, the reel lock lever 10 that prevents the rotation of the take-up reel 4 has a pair of arms 10b and 10c protruding from a cylindrical portion 10a rotatably supported by a pin 12, and one arm 10b. has a claw portion 10 at its tip that engages with teeth formed on the outer periphery of the take-up reel 4.
d is provided as an engaging arm, the other arm 10c is brought into contact with the release lever 13 and serves as an operating arm, and the pin 12
One end of the torsion spring 15 provided in the torsion spring 15 is hooked to the hook portion 10e of the engagement arm 10b, thereby urging the engagement arm 10b to engage with the teeth of the take-up reel 4, and Arm 10c is release lever 1
3, the reel lock lever 10 and the take-up reel 4 are engaged and disengaged.

However, the engaging arms 9b, 10b and the operating arms 9c, 10c of both reel lock levers 9, 10 have different shapes, and furthermore, due to the relationship between their arrangement positions,
With both reel lock levers 9 and 10, the engaging arm 9
b, 10b and working arms 9c, 10c have opposite protruding positions and have mutually different shapes.

[The problem that the idea attempts to solve]

For this reason, two types of reel lock levers have to be manufactured, two types of molding molds are required, which increases production costs, and parts management is also troublesome. I was trying not to confuse them.

Therefore, the present invention uses one type of reel lock lever in common, reduces manufacturing costs, facilitates parts management, and allows the elastic force of the torsion spring to act stably, reducing the number of magnetic tape dropouts. The purpose of the present invention is to provide a magnetic tape cassette that suppresses magnetic tape as much as possible.

[Means for solving problems]

In order to achieve the above object, the present invention stores a reel wound with magnetic tape in a cassette body, rotatably supports a reel lock lever on a pair of pins provided upright on the cassette body, and locks the reel lock. A torsion spring that urges the lever to rotate is used to engage one arm of the pair of arms of the reel lock lever with the outer periphery of the reel, and bring the other arm into contact with the release lever. In the magnetic tape cassette, the pair of arms of the reel lock lever protrude so that the hooking portions of the torsion spring are opposed to each other, and each has a claw portion on the outside of the tip so that the arms can be rotated around the pin. It is characterized by a symmetrical V-shaped protrusion on the shaft-supported cylindrical part.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In the drawings, the same elements as those in FIGS. 2 and 3 will be described with the same reference numerals.

A supply reel 3 disposed on the cassette body 1;
Reel lock levers 20, 20, which respectively engage the take-up reel 4, are formed in the same shape and are rotatably supported by pins 11 and 12, respectively, which are provided upright on the cassette body 1.

This reel lock lever 20 has a cylindrical portion 20a rotatably supported by the pin 11 or 12.
, a pair of arms 20b, 20b are provided protrudingly in a V-shape, and the pair of arms 20b, 20b are arranged such that the hooking portions 20c, 20c of the torsion springs 14, 15 are opposed to each other at their intermediate portions. They are provided symmetrically on the cylindrical portion 20a with claw portions 20d and 20d formed on the outer side of the tip.

Then, the reel lock lever 20 configured as described above is fitted with the cylindrical portion 20a onto the pin 11 on the side of the supply reel 3 disposed on the right side in the figure.
The claw portion 20d at the tip of one arm 20b is connected to the supply reel 3.
The other arm 2 is engaged with the toothed portion 3b of the
0b is an operating arm that is pushed by the release lever 13 to engage and disengage the claw portion 20d of the one arm 20b. pin 12
The claw portion 20d of the arm 20b opposite to the right reel lock lever 20 is used as an engaging arm that engages the outer periphery of the take-up reel 4, and the other arm 20b is pushed by the release lever 13. It acts as a working arm.

Note that if the hooking portions 20c of the torsion springs 14 and 15 are formed on the upper and lower surfaces of the arm 20b, the reel lock lever 20 can also be used upside down.

Since the present embodiment is as described above, one type of reel lock lever 20 can be used in common, and only one type of molding die is required, so manufacturing costs can be reduced and parts management can be facilitated.

Further, since the torsion springs 14 and 15 are engaged with the hooking portion 20c of the arm 20b, the elastic force of the torsion springs 14 and 15 stably acts on the reel lock lever 20, and furthermore, the torsion spring 14 and 15 are generated, and the number of dropouts of the magnetic tape 2 can be minimized.

[Effect of idea]

As described above, the present invention provides a pair of arms of the reel lock lever with the hooking portions of the torsion springs protruding from each other so as to face each other, and claw portions are formed on the outside of the tips of the two arms. Since the cylindrical part rotatably supported by the pin has a symmetrical V-shaped protrusion, there is no need for two types of reel lock levers, and one type of reel lock lever can be used in common. Not only can manufacturing costs be reduced and parts management is easy, but also because the torsion spring is engaged with the arm hook,
The elastic force of the torsion spring stably acts on the reel lock lever, and the torsion spring generates few scraps, making it possible to minimize the number of magnetic tape dropouts.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the main parts of an embodiment of the present invention, Fig. 2 is a plan view with the upper half of the videotape cassette removed, and Fig. 3 shows the arrangement of the reel lock lever. FIG. 1...Cassette body, 2...Magnetic tape, 3...
...Supply reel, 4...Take-up reel, 11, 12...
...Pin, 13...Release lever, 14, 15...
... Torsion spring, 20 ... Reel lock lever, 20a ... Cylindrical part, 20b ... Arm, 20
c...Latching part, 20d...Claw part.

Claims (1)

[Scope of utility model registration request] Reels 3 and 4 on which the magnetic tape 2 is wound are housed in the cassette body 1, and reel lock levers 20 and 20 are attached to pins 11 and 12 provided upright in the cassette body 1.
One arm 20b of the pair of arms 20b, 20b of the reel lock lever 20 is rotated by a torsion spring 14, which rotatably supports the reel lock levers 20, 20, respectively. The other arm 2 is engaged with the outer periphery of the reels 3 and 4, respectively.
In the magnetic tape cassette in which the reel lock lever 0b is brought into contact with the release lever 13, the pair of arms 20b, 20b of the reel lock lever protrude to face the hooking parts 20c, 20c of the torsion spring 14, respectively. Claw portions 20d, 20d are formed on the outside of the tip, respectively, and the pin 11,
1. A magnetic tape cassette characterized in that a cylindrical portion 20a rotatably supported by a shaft 12 has a symmetrical V-shaped protrusion.