JPS6020208Y2 - Tape cassette reel locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette reel locking device that is most suitable for application to recording and reproducing devices such as video tape recorders and audio tape recorders.

The applicant of this invention is the prior invention (Patent application No. 159901/1986)
In the earlier application, a ratchet part is formed on the outer periphery of a pair of tape reels built into a tape cassette, and the ratchet parts are engaged with the two ratchet parts respectively by reciprocating movement, thereby producing the above-mentioned invention. A pair of rotatable first pawl bodies that prevent rotation of both tape reels in the tape feeding direction, and their backward movement engages with both of the ratchet parts to drive both of the tape reels in the tape winding direction. movable second
and after the first claw moves back and engages with both the ratchet parts, the second claw moves back and meshes with both the ratchet parts, and the tape reels are reeled. This constitutes a tape cassette reel locking device that rotates the tape in the tape winding direction.

According to this prior invention, when both tape reels are locked, the tape is wound up a little by both tape reels,
A major feature of this tape is that it can remove slack in the tape.

However, in this prior invention, while the second claw body is assembled by slidably engaging with a sliding guide provided on the cassette half, the pair of first claw bodies are attached to a pair of fulcrums provided on the cassette half. (assembled by rotatably fitting each pin), which had a defect that increased the number of parts and assembly man-hours, resulting in high costs.

The present invention aims to provide a tape cassette reel locking device that can correct the above-mentioned defects.

An embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described below with reference to the drawings.

First, as shown in FIG. 1, a pair of left and right tape reels 2.3 are rotatably housed in a tape cassette 1 made of synthetic leather and resin.

A magnetic tape (hereinafter simply referred to as 1-chibyo) 4 is wound around both tape reels 2 and 3.

This magnetic tape 4 is normally passed along an opening 5 provided on the front surface of the tape cassette 1.

When the tape cassette 1 is installed in the cassette device position of the video tape recorder, a tape loading guide (not shown) is inserted through the notch 6 provided on the bottom surface of the tape cassette 1, and the tape 4 is loaded. There is.

In FIG. 1, 7 is a front cover that covers the opening 5, 8 and 9 are reel hubs of the tape reels 2 and 3, and 10 and 11 are a pair of left and right reel fitting holes provided in the bottom wall of the tape cassette 1. The lower ends of the reel hubs 8 and 9 are rotatably fitted into the reel fitting holes 10 and 11, respectively.

Next, as shown in FIG. 2, a pair of ratchet parts 14.
15 is formed.

Note that these ratchet portions 14, 15 have mutually opposite directions.

Next, as shown in FIGS. 2 to 5, both tape reels 2 and 3 are
At the rear position of the intermediate portion 16, there is a first claw body 17;
A second claw body 18 is arranged.

Both pawl bodies 17 and 1B are each pre-molded from a synthetic resin, and the main bodies 19.20 of these pawl bodies 17 and 1B are respectively engaged with double check portions 14.15. A pair of left and right locking claws 21 and 22 are integrally formed.

Note that each of the locking claws 19 and 20 is formed into a thin plate shape and has appropriate elasticity.

By the way, the main body 20 of the second claw body 18 has a prismatic shape, and both retaining claws 22 are integrally provided at the tip of the main body 20.

The second claw body 18 is arranged between the main body 2
It is configured so that it can be engaged (fitted) and slidably moved in and out of the intermediate portion 16 in the front-rear direction.

Further, the main body 19 of the first claw body 17 has a U-shape with an open bottom side, and both retaining claws 21 are integrally provided on both sides of the main body 19.

The first claw body 17 straddles the main body 20 portion of the second claw body 18 and both sliding guide plates 26 from above, and is engaged from above by the U-shaped groove 27 of the main body 19. (fitted) and configured to be slidable in the same direction as the second claw body 18.

As shown in FIGS. 3 and 4, when the tape cassette 1 is assembled, the presser plate 29 integrally provided on the upper wall 28 of the upper cassette half 1b is attached to the main body of the first claw body 17. 19 Press down.

Further, the leaf spring 3 has both ends locked in a pair of left and right locking grooves 29 integrally provided in the rear wall 25 of the lower cassette half 1a.
0 is arranged behind both claw bodies 17 and 18.

The leaf spring 30 contacts the rear end surface 20a of the main body 20 of the second claw body 18 and presses it forward.

A spring piece 30a is integrally provided on this leaf spring 30, and this leaf spring piece 30a comes into contact with the rear end surface 19a of the first claw body 17 to press it forward.

Note that a protrusion 31 is integrally provided on the upper part of the front end of the main body 20 of the second claw body 18, and this protrusion 31 comes into contact with the front end surface 19b of the main body 19 of the first claw body 17 from the front side. configured to be possible.

Further, as shown in FIG. 3, a pin insertion hole 33 is provided on the lower surface of the main body 20 of the second claw body 18.

Furthermore, a long hole 34 communicating with the pin insertion hole 33 is formed in the bottom wall 24 in the front-rear direction.

When the tape cassette 1 is installed in the cassette mounting position of the video tape recorder, the lock release pin 35 provided on the cassette device passes through the long hole 34 and into the pin insertion hole 3.
It is designed to be inserted in 3.

The reel locking device of the tape cassette 1 is constructed as described above, and first, as shown in FIG.
1B is connected to arrow a by leaf spring 30 and spring piece 30a, respectively.
each pair of locking claws 21,
22 is the ratchet part 14.15 of both tape reels 2 and 3
are interlocked together.

Therefore, in this state, the rotation of both tape reels 2 and 3 in the tape feeding directions shown by arrows and C in FIGS. 2 and 1 is prevented, and both tape reels 2 and 3 are in a locked state. There is.

In this state, a gap g is formed between the front end surface 19b of the main body 19 of the first claw body 17 and the protrusion 31 of the main body 20 of the second claw body 18.

Next, when the tape cassette 1 is installed in the cassette mounting position of the video tape recorder and a record button or play button (not shown) is operated, both tape reels 2.3 are unlocked.

That is, when the tape cassette 1 is mounted at the cassette mounting position, the lock release pin 35 provided at the cassette mounting position passes through the elongated hole 34 of the bottom wall 24 of the tape cassette 1, as shown by the solid line in FIG. The second claw body 18 is inserted into the pin insertion hole 25 of the main body 20.

When a record button or a playback button (not shown) is operated, the lock release pin 35 is moved in the direction of the arrow d from the position shown by the solid line to the position shown by the imaginary line in FIG. 3 and locked.

As a result, as shown in FIG. 6, the second pawl body 18 is moved in the direction of arrow d against the leaf spring 30 by the lock release pin 35, and the porcelain retaining pawl 22 is moved between both ratchet portions 14 and 15.
removed from

At this time, the second claw body 18 is inserted into the gap g shown in FIG.
When the protrusion 31 is moved in the direction of the arrow d by a distance of
The claw body 17 contacts the front end surface 19b of the main body 19, and thereafter the first claw body 17 is pushed by the protrusion 31, and the first claw body 17 also moves in the direction of arrow d against the spring piece 30a. The porcelain pawl 21 is removed from both ratchet parts 14,15.

As a result of the above, both tape reels 2 and 3 are unlocked, and both tape reels 2 and 3 become rotatable.

In this way, the tape reel locking device in this embodiment locks both tape reels 2 and 2 until just before the tape cassette 1 is installed in the cassette mounting position and a recording or playback operation is performed.
3 is securely locked.

Therefore, even if a shock or the like is applied to the tape cassette 1 when the cassette is installed, the tape 4 will not loosen at all.
There is no risk that the tape loading guide inserted through the notch 6 will collide with the tape 4 and damage it when the cassette is installed.

Next, when the stop button (not shown) is operated after the recording or reproducing operation is completed, the third lock release pin 35 is pressed.
The lock is released in the forward movement position shown by the phantom line in the figure.

Then, both claw bodies 17 and 18 are connected to the leaf spring 30 and the spring piece 30a.
Due to the pressing force, both claws 17 and 18 are simultaneously moved in the direction of arrow a in FIG. 7 and pushed back to the position shown in FIG. 2.

As a result, each pair of locking pawls 21 and 22 are engaged with both ratchet parts 14 and 15 as at the beginning, and both tape reels 2,
Lock 3 again.

However, as shown in FIG. 7, when both claw bodies 17 and 18 are pushed back in the direction of arrow d, the first claw body
The porcelain retaining claws 21 of No. 7 are engaged with both ratchet portions 14 and 15 to prevent rotation of both tape reels 2 and 3 in the directions of arrows A and C, which are tape feeding directions.

After this, the second claw body 18 is moved to the gap g shown in FIG.
is moved in the direction of arrow a by a distance of
The porcelain pawl 22 of the pawl body 18 is attached to both ratchet portions 14 and 15.
is engaged with.

However, at that time, both ratchet parts 1 are
4.15 is pressed and both tape reels 2, 3 are slightly rotated in the tape winding direction indicated by arrows e and f in FIGS. 7 and 1.

As a result of the above, at the final stage of the locking operation of both tape reels 2 and 3, both tape reels 2 and 3 are automatically rotated in the tape winding direction, and the tape 4 is automatically wound on both tape reels 2 and 3. The slack in the tape 4 is removed and the tape 4 is tightened.

In this way, the tape reel locking device of this embodiment can automatically remove the slack in the tape 4 when the tape cassette 1 is ejected from the video tape recorder, so that the tape cassette 1 can then be ejected again from the video tape recorder. Since the tape 4 is loose when it is loaded into the tape recorder, there is no risk that the tape loading guide will collide with the tape 4 and damage it.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment and can be modified in various ways.

Further, the present invention is not only applied to tape cassettes for video tape recorders and audio tape recorders, but also to tape cassettes for various other information processing devices.

As mentioned above, the present invention has a ratchet section formed on the outer periphery of a pair of rotatably housed reels, and when the ratchet sections move back, they engage with both of the ratchet sections and prevent the reel from rotating in the tape feeding direction. In the tape cassette, the tape cassette is provided with a first pawl body that rotates the reels in the tape winding direction by engaging the ratchet portions and rotating the reels in the tape winding direction by the second pawl body that rotates the reels in the tape winding direction. One of the claw body or the second claw body is slidably engaged with a sliding guide provided on the cassette half, and the other is slidably engaged with the upper part of the above-mentioned one. Since this is a tape cassette reel lock device that is characterized by The number of claw bodies is the minimum, and these two claw bodies are assembled by sequentially engaging each other from above, making assembly and disassembly very easy.

Therefore, according to the present invention, the number of parts and the number of assembly steps are extremely small, making it possible to significantly reduce costs.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a tape cassette for a video tape recorder, and FIG. 1 is a plan view showing a partially cut away top wall of the tape cassette, and FIG. A plan view illustrating the locked state of both tape reels by both claw bodies, FIG. 3 is an enlarged sectional view taken along the line ■-■ in FIG. 2, FIG. The figure is an exploded perspective view of the main parts, and FIGS. 6 and 7 are plan views similar to FIG. 2, illustrating the unlocking and locking operations of both tape reels. In addition, in the symbols used in the drawings, 1... tape cassette, 2, 3... tape reel, 4... magnetic tape, 14, 15...
...Ratchet part, 17...First claw body, 18...Second claw body, 19,20...
・Body, 21.22...Latching claw, 26...
...Sliding guide plate, 27...U-shaped groove, 30.
...Plate spring, 30a...Spring piece.

Claims (1)

[Scope of utility model registration request] A first pawl body having a ratchet portion formed on the outer periphery of a pair of rotatably housed reels, and engaging with both ratchet portions by the backward movement of the ratchet portion to prevent rotation of both reels in the tape payout direction. and a second pawl body that engages with both the ratchet portions and rotates both the reels in the tape winding direction by its backward movement, wherein the first pawl body or the second pawl body A tape characterized in that one of the claw bodies is slidably engaged with a sliding guide provided on a cassette half, and the other is slidably engaged with the upper part of the above-mentioned one. Cassette reel lock device.