JPS61210580A - Reel lock device for tape cassette - Google Patents

Abstract

PURPOSE:To detach a couple of elastic engaging pieces diverged toward the end from a tooth of a tape reel by arranging freely slidably a claw main body between couple of guides in a lower half and forwarding the claw to fold up the engaging pieces provided to the tip of the claw toward the inner direction by the guides. CONSTITUTION:In selecting the mode of a video tape recorder into, e.g., the reproduction mode, a lock release pin 103 is forwarded in the direction of arrow (l). The claw 90 is forwarded from the home position to the forward position against a torsional spring 91. In this case, a couple of the elastic engaging pieces 89 of the claw 90 are guided by the edge of a couple of guides 94 and detached surely and very easily from both teeth 106 of a couple of tape reels 8, 9 while being folded up toward the inside against the elasticity. In this case, a couple of claws 88 are turned forwardly against the torsional spring 91, a couple of claws 97 are detached from both the teeth 106 to release the lock of a couple of tape reels 8, 9. Thus, the engaging pieces 89 are detached easily from the teeth 106 in forwarding the claw to ensure the release of lock of the tape reels.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is most suitable for application to tape cassettes for video tape recorders, for example, and particularly relates to a reel lock device that prevents rotation of a built-in tape reel. .

Conventionally, tape cassettes for video tape recorders and the like have teeth formed on the outer periphery of a pair of tape reels built into the tape cassette, and when the tape cassette moves, it engages with both teeth and at least one of both tape reels is formed. A reel locking device is provided with a reciprocating pawl that prevents rotation in the tape feeding direction. This reel locking device is for locking the tape reel so that the reel does not rotate and loosen the tape when the tape cassette is not in use.

By the way, conventional reel lock devices usually use a pair of claw bodies that are reciprocated by rotation.

However, with a rotary claw, when the claw is moved forward to release the tape reel's lock, and the tip of the claw is separated from the teeth of the tape reel, the tip of the claw and the teeth are Due to the retention frictional force, the tip of the claw body cannot be easily separated from the toothed portion, and unlocking of the tape reel may become uncertain. Moreover, in this case, a strong force is required to move the claw body forward, and a large load is applied to the claw body, which tends to cause problems such as easy breakage of the claw body.

The present invention was invented to correct the above-mentioned defects, and is designed to allow the claw body to always be easily and reliably separated from the teeth of the tape reel when the claw body moves forward. The present invention aims to provide a tape cassette gluing device.

Hereinafter, the present invention will be described as a tape cassette 7 for a video tape recorder.
) will be described based on the drawings.

As shown in Figs. 1 to 5, the tape cassette l is composed of a rectangular upper half 2 and a lower half 3 made of synthetic resin, and these upper half 2 and lower half 3 are fitted into each other from above and below. They are combined and screwed together with setscrews 4 to 7 to form an integrated housing. A pair of tape reels 8 and 9 are rotatably housed within this tape cassette 1.
A magnetic tape (hereinafter simply referred to as "tape") 10 is wound around both tape reels 8.9. The lower ends of the reel hubs 8a19a of both tape reels 8.9 are fitted into a pair of reel fitting holes 11.12 provided in the bottom wall 3a of the lower half 3, as shown in FIG. has been positioned. Also, each reel hub 8a
, 9a house a pair of presser springs 13, and the upper ends of the pair of presser springs 13 are covered with a pair of caps 14. When the tape cassette 1 is installed at the cassette mounting position in the video tape recorder main body, a pair of reel drive shafts (not shown) are inserted into the pair of reel hubs 8a and 9a, and at this time, the pivot portions 15 of the pair of caps 14 are inserted into the upper half. Both tape reels 8 and 9 are urged toward the reel drive shaft by the presser spring 13, and the lower end surfaces of the tape reels 8 and 9 are in contact with the positioning surfaces of the pair of reel drive shafts. The two tape reels 8.9 are positioned in contact with each other in the vertical direction.

An opening 18 is provided on the front surface of the tape cassette 1 over substantially the entire width of the cassette. Also, the bottom wall 3 of the lower half 3
As shown in FIGS. 2, 3, and 5, a notch 19 is provided that is continuous with the opening 18. Furthermore, the upper wall 2a of the upper half 2 is provided with an upper notch 20 which is continuous with the opening 18. The opening 18 of the tape cassette 1 is always covered by the front M31, and the upper notch 20 is always covered by the upper M38.

The tape 10 is guided by a pair of tape guide parts 32 integrally formed on both left and right sides of the front end of the upper wall 2a of the upper half 2, and is passed along the opening 18. The front and back and top and bottom of the tape 10 are the front lid 37,
It is configured to be covered by an upper lid 38 and an inner lid 39.

The front cover 37 is rotatably attached to a pair of pin holes 42 provided at the front ends of the left and right side walls 2b of the upper half 2 by a pair of fulcrum pins 41 provided inside a pair of side plate portions 37a at both left and right ends thereof. The upper lid 38 and the inner lid 39 are each rotatably attached to the inside of the front lid 37.

Normally, the front cover 37, upper cover 38, and inner cover 39 are closed as shown in FIG. 1 by a closing spring (not shown), and the lock mechanism is unlocked to close the front cover. 3
7 is opened above the upper half 2 as shown in FIG. 2, the upper M38 and inner lid 39 are also opened in conjunction with the front lid 37.

Next, according to FIGS. 4 to 8, this tape cassette 1
The reel lock device 87 provided therein will be explained.

This reel locking device F87 is provided in the rear central part of the tape cassette 1, and includes a pair of left and right claw bodies 88,
It consists of a claw body 90 having a pair of left and right elastic engagement pieces 89, and a torsion spring 91.

A pin hole 92 is provided in each of the pair of claw bodies 88, and a pair of left and right support pins 93 are integrally formed on the bottom wall 3a of the lower half 3. The pair of claw bodies 88 are rotatable by having their pin holes 92 inserted into support pins 93, respectively. On the other hand, the claw body 90 is the lower half 3
It is slidably mounted on the bottom wall 3a, and its left and right sides are sandwiched by guide portions 94 consisting of a pair of left and right parallel plates integrally formed on the bottom wall 3a. The pawl body 90 is guided by a pair of guide portions 94 and is slidable on the bottom wall 3a in the front-rear direction. An insertion hole 95, which is a longitudinally elongated hole, is provided in the bottom wall 3a between the pair of guide portions 94, and a lock release pin 103, which will be described later, can be inserted into the insertion hole 95.

More specifically, the pair of claw bodies 88 has a substantially T-shape, has a claw portion 97 at its tip, and has a pressed portion 98 and a spring receiver portion 99 at both left and right ends. Further, the back side of the spring receiver portion 99 forms a stopped portion 100.

The claw body 90 is specifically molded from synthetic resin, and includes a main body 101 having a substantially square block shape long in the front and back, and a pair of thin plates integrally molded at the tip of the main body 101. It is composed of an engaging piece and a vertical spring support pin 102 integrally formed on the upper surface of the main body 101.

The pair of elastic engagement pieces 89 are configured in a shape that widens toward the tip (approximately in the shape of a letter V) such that the distance between them increases toward the tip.

Furthermore, an engagement hole 104 is vertically provided in the center of the front and rear sides of the lower surface 101a of the main body 101, and a lock release pin 103, which will be described later, can be inserted into the engagement hole 104. However, the upper end of the engaging hole 104 is closed, and the retaining hole 1.04 is configured as a so-called blind hole.

Further, this claw body 90 is arranged so as to be slidable in the front and rear direction between both guide portions 94 on the bottom wall 3a of the lower half 3 by its main body 101, and is disposed on the bottom surface 101a of the main body 101.
The insertion hole 95 is closed from above by this, and the engagement hole 104, which is a blind hole, is located above the insertion hole 94.

Further, the torsion spring 91 is inserted and attached from above to the spring support pin 102 of the claw body 90 by its central coil portion 91a, and the pair of left and right free ends 91b are connected to the pair of spring holders of the pair of claw bodies 88. It is in contact with 99. Therefore, the pair of claw bodies 88 are located at the seventh position around the pair of support pins 93.
At the same time, the pawl body 90 is urged to slide in the direction of arrow i in FIG. 11 at the same time as it is urged to rotate in the direction of arrow g and in the direction of arrow i in FIG. Note that the pressing portion 105 at the rear end of the claw body 90 is opposed to both pressed portions 98 of the pair of claw bodies 88 .

The pair of claw bodies 88 is normally held at its stopped portion 10.
0 comes into contact with the rear wall 3c of the lower half 3, and in FIG.
In this state, the pair of claws 97 are released from the pair of ratchets provided on the outer periphery of the lower reel flange portions 8b and 9b of the pair of tape reels 8.9. It is designed to mesh with the toothed portion 106.

However, the pair of claws 97 are located at the center of the tape reel 8.9.
The two support pins 93 are engaged with each other at a position slightly above the straight line connecting the support pins 93 and the pair of support pins 93 in FIG. That is, the tape reel 8 is prevented from rotating in the direction of arrow a in FIG. 7, and the tape reel 9 is prevented from rotating in the direction of arrow I in FIG.

Further, a stopper portion 107 is provided on the bottom wall 3a of the lower half 3 in a protruding manner in front of the claw body 90, and the stopper portion 107 is indicated by the arrow i in FIG.
Movement in this direction is normally prevented by this stopper portion 107. In this state, the pair of elastic engagement pieces 89 are engaged with both toothed portions 106 of both tape reels 8.9. Note that the pair of claw portions 97 and the pair of elastic engagement pieces 89 are respectively engaged with the tooth portions 106 (state B shown by solid lines in FIG. 7).
Here, a predetermined gap is formed between the pressed part 98 of the pair of first claw bodies 88 and the pressing part 105 of the claw body 90,
As will be made clear in the explanation of the operation described later, the pair of claws 9
7 and the pair of elastic engagement pieces 89 are designed to engage at different times.

According to the reel locking device configured as described above, when the tape cassette 1 is not in use, the claws 97 of the pair of claws 88 and the claws 90 Both elastic engagement pieces 89 are engaged with both toothed portions 106 of both tape reels 8.9 by the spring force of a torsion spring 91, and in FIG. The reel is in a so-called reel locked state in which rotation in the directions of arrows a and b is prevented.

Next, when this tape cassette 1 is installed in a video tape recorder, the lock release pin 103 provided at the cassette installation position in the video tape recorder is inserted into the sixth position.
The insertion hole 95 of the lower half 3, as shown by the solid line in Figs.
and is inserted into the engagement hole 104 of the claw body 90.

This lock release pin 103 is linked with an operation button (not shown) of the video tape recorder. For example, when the video tape recorder is set to playback mode, the lock release pin 103
moves forward in the direction of arrow l to the position shown by the two-dot chain line in FIG. Therefore, the claw body 90 moves forward against the torsion spring 91 from the backward movement position shown by the solid line in FIG. 7 to the forward movement position shown by the two-dot chain line.

At this time, the pair of elastic engagement pieces 89 of the claw body 90 are guided by the ends of the pair of guide portions 94, and both teeth portions 106 of the pair of tape reels 8.9 are contracted inward against the elasticity. It can be removed extremely easily and reliably.

At this time, when the claw body 90 moves forward to the position shown by the dashed line in FIGS. 10
5 begins to press the pressed portion 98 of the pair of claws 88. When the claw bodies 90 move forward to the position indicated by the two-dot chain line in FIGS. 7 and 8, the pair of claw bodies 88 resist the torsion spring 91 to the position indicated by the two-dot chain line in FIG. As it rotates forward, the pair of claws 97 are disengaged from both teeth 106, and the pair of tape reels 8.9 are unlocked.

On the other hand, if you put the video tape recorder in stop mode,
The lock release pin 103 moves back in the direction of arrow i to the position shown by the solid line in FIG. At this time, when the claw body 90 moves back to the position shown by the dashed line in FIGS. 7 and 8, the pair of claw bodies 88 returns to the position shown by the solid line in FIG. 7 due to the biasing force of the torsion spring 91. It rotates, and the pair of claws 97 first mesh with both teeth 106 . Next, while the claw body 90 moves back to the position shown by the solid line in FIGS. .9 rotates slightly in the direction of arrow m and the direction of arrow n, which are the tape winding directions in FIG.

Therefore, unlike the conventional glue-on device, a pair of claw bodies 8
8 is used, when the pair of claw bodies 88 rotates back and engages with both teeth 106, both tape reels 8.9 move in the direction of arrows m and n in FIG. , the tape 10 is rotated slightly in the b direction and bussed along the opening 18.
However, with the reel lock device, such slack in the tape IO is completely eliminated.

As the claw body 90 moves back in the direction of the arrow i in FIG. 106, and both elastic engagement pieces 8
The meshing position of the tape reels 8 and 9 with the teeth 106 is always constant, and both tape reels 8 and 9 can always be reliably locked. Further, at this time, both elastic engagement pieces 89 can be opened outward more reliably by the guidance from the inside of the stopper portion 107.

Further, the engagement hole 104 of the claw body 90 is a blind hole whose upper end is closed, and the insertion hole 95 of the lock release pin 103 of the lower half 3 is always blocked by the lower surface 101a of the main body 101 of the claw body 90. Therefore, these insertion holes 95 and engagement holes 10
There is no possibility that dust or the like will enter the tape cassette 1 from the tape cassette 4.

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 various modifications are possible.

Furthermore, the present invention is applicable not only to tape cassettes for video tape recorders, but also to tape cassettes for various other information processing devices.

As described above, the present invention comprises a claw body consisting of a main body and a pair of elastic engagement pieces integrally formed at the tip of the main body,
Both elastic engagement pieces are configured in a tapering shape in which the distance between them widens as they reach the tip, and the main body of the claw body is slid between a pair of guide parts integrally molded inside the lower half of the tape cassette. Both elastic engagement pieces are guided by both guide parts by the forward movement of the claw body, and both elastic engagement pieces are deflated inwardly against their elasticity. This is a reel locking device for a tape cassette, which is configured so that a joint piece can be separated from both toothed portions of both tape reels.

Therefore, according to the present invention, when the claw body moves forward, both elastic engagement pieces are guided by both guide parts and are detached from both toothed parts of both tape reels while narrowing inward against elasticity. Therefore, when the claw body moves forward, both elastic engagement pieces can always be very easily and reliably removed from both toothed portions of both tape reels. Therefore, the tape reel can be unlocked easily and reliably at all times, and the claw body can be moved forward easily with a small amount of force. In addition, a large load is applied to the claw body, especially both elastic engagement pieces, which may cause them to break. There is no chance that it will happen.

Further, according to the present invention, when the claw body moves backward, both elastic engagement pieces are guided by both guide parts and are engaged with both toothed parts of both tape reels while opening outward due to elasticity. There is also an advantage that the meshing position of the elastic engagement piece with both toothed portions is always constant, and both tape reels can always be reliably locked.

[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 perspective view of the tape cassette when it is not installed, and FIG. 2 is a perspective view of the tape cassette when it is installed. Figure 3 is an exploded perspective view of the same as the above, Figure 4 is a plan view of the same as the above, Figure 5 is a bottom view of the same as the above, Figure 6 is an exploded perspective view of the reel lock device, and Figure 7 is a plan view of the same as the above. , FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. In addition, in the symbols used in the drawings, 1・-1−−−・・−・−・−・Tape cassette 3−−
------------------・-----Ichika Half 3a
----------------------- Bottom wall 8, 9 of the lower half------------- Tape reel 87--・−−−1−−−−−−−−−−−
-Reel-off device 89------1--------
Elastic engagement piece 90 --------------------------------------------------------------------------- doing is is the of the guide section 1gascgome 94;--;--1;
01-・-1------------Body 106---
--------------One tooth part.

Claims (1)

[Claims] A reciprocating pawl that has teeth formed on the outer periphery of a pair of tape reels built into the tape cassette, and engages with both teeth when the teeth move back to prevent rotation of both tape reels at least in the tape feeding direction. In the reel locking device for a tape cassette, the claw body is composed of a main body and a pair of elastic engagement pieces integrally formed on the tip of the main body, and both elastic engagement pieces reach the tip. The main body of the claw body is slidably disposed between a pair of guide portions integrally molded within the lower half of the tape cassette, and By the forward movement of the body, both the elastic engagement pieces are guided by the two guide parts, and the elastic engagement pieces are contracted inwardly against the elasticity of the elastic engagement pieces. A reel locking device for a tape cassette, characterized in that it is configured to be detached from a toothed portion.