JPS6349905Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a tape cassette that is most suitable for application to recording and reproducing devices such as video tape recorders and various other information processing devices, and in particular,
A toothed portion is formed on the outer periphery of a pair of rotatably housed reels, and a slidable sliding body is provided so as to be able to move in and out of the intermediate portion of both reels, and this sliding body has the above-mentioned teeth. A pair of elastic locking pawls are provided which are engaged with the respective parts, and these locking pawls are formed so that the distance between them increases as they reach their tips, and the sliding body is actuated by an urging means. The present invention relates to a tape cassette configured to engage the locking pawls with the tooth portions and restrict the rotation of the reels in the tape feeding direction by pressing the tape cassette with the tape cassette and sliding it toward the intermediate portion. be.

BACKGROUND TECHNOLOGY AND PROBLEMS FIGS. 1 to 3 show conventional tape cassettes for video tape recorders. First, as shown in FIG. Consisting of 2 and 3 fitted together,
Inside the tape cassette 1, a pair of left and right reels 5 and 6 on which a magnetic tape (hereinafter simply referred to as tape) 4 is wound is rotatably housed. The tape 4 is passed along the front opening 7 of the tape cassette 1, and when the tape cassette 1 is installed in the cassette loading position of a video tape recorder (not shown), the tape 4 is passed along the front opening 7 of the tape cassette 1. The tape 4 is inserted into the inner side of the tape 4 by a loading means, and thereafter the tape 4 is loaded by the loading means. Note that 9 is a front lid that covers the front opening 7, 10 and 11 are reel hubs for the reels 5 and 6, and 12 and 13 are a pair of left and right reel fitting holes provided in the bottom wall 3a of the lower half 3. Fitting holes 12, 13
The lower end portions of both the reel hubs 10 and 11 are rotatably fitted into the reel hubs 10 and 11, respectively.

Next, as shown in FIGS. 1 to 3, tooth portions 15 and 16 are formed on the outer peripheries of the lower flanges 5a and 6a of the reels 5 and 6, respectively. On the other hand, the bottom wall 3a of the lower half 3 of the tape cassette 1 is provided with a sliding body 17 made of synthetic resin and shaped into a rectangular parallelepiped. This sliding body 17 is arranged on the rear side of the intermediate part 18 of both reels 5 and 6, and on both left and right sides thereof, there is a pair of parallel guide walls 19 that are integral with the bottom wall 3a and the rear wall 3b of the lower half 3. , 20 are provided. Further, a guide protrusion 27 that is integral with the bottom wall 3a of the lower half 3 is provided at a front intermediate position of both guide walls 19, 20. The sliding body 17 is guided by both guide walls 19 and 20 and is slidable in the front-rear direction (in the directions of arrows a and b in FIG. 2) so as to be able to move in and out of the intermediate portion 18. And a compression spring 2 which is a biasing means
Both guide walls 1 are in contact with the rear end of the sliding body 17 and the rear wall 3b of the lower half 3, respectively.
It is stored between 9 and 20. On the other hand, a pair of left and right locking pawls 22 and 23 are provided at the front end of the sliding body 17 to engage with the teeth 15 and 16. These locking claws 22 and 23 are connected to the sliding body 1 made of synthetic resin.
7, and is thinly molded to have appropriate elasticity. And both the locking claws 22 and 23 have these tips 22a and 23a.
They are formed in an arcuate or slanted shape so that the distance between them increases as the distance increases. Also, sliding body 1
A pin insertion hole 24 is provided on the bottom surface of 7.
Further, a long hole 25 communicating with the pin insertion hole 24 is formed in the bottom wall 3a of the lower half 3 in the front-rear direction. When the tape cassette 1 is mounted at the cassette mounting position of a video tape recorder, the lock release pin 26 provided at the cassette mounting position is inserted into the pin insertion hole 24 through the elongated hole 25.

The conventional tape cassette 1 is constructed as described above, and normally the ends 22a and 23a of the pair of locking claws 22 and 23 are connected to the compression spring 2, as shown by the solid line in FIG.
It meshes with a pair of teeth 15 and 16 with one biasing force. The rotation of the reel 5 in the direction of arrow c (tape feeding direction) in FIG. 2 is controlled by the locking pawl 22.
Further, the rotation of the reel 6 in the direction of arrow d (tape feeding direction) in FIG. 2 is prevented by the locking claws 23, respectively.

Next, when the tape cassette 1 is installed in the cassette mounting position of the video tape recorder and a tape running operation push button such as a record button or a play button (none of which is shown) is operated, the pair of reels 5 and 6 are unlocked. be done. That is, when the tape cassette 1 is installed in the cassette mounting position, as shown in FIG. Pin insertion hole 24 of sliding body 17
inserted into. Then, when the tape running operation push button is operated, the lock release pin 26 is automatically moved to the third position.
It is moved forward and locked into the position shown by the imaginary line in the figure. Therefore, the sliding body 17 moves in the direction of the arrow b in FIG.
comes off from the teeth 15, 16 of both reels 5, 6.

Next, when a stop button (not shown) is operated, the lock release pin 26 is released from the forward position shown by the phantom line in FIG. Then the sliding body 17
is moved back by the compression spring 21 in the direction of arrow a in FIG.
5 and 16, and both reels 5 and 6 are locked again. At this time, as the sliding body 17 moves back, the tips 22a and 23a of both the locking claws 22 and 23 are forcibly pushed apart. That is, the guide protrusion 27 provided on the bottom wall 3a of the lower half 3 engages both the locking claws 22, 23.
relatively intervening by wedge action. The locking claws 22 and 23 are moved in the direction of arrow a and are pressed against the left and right ends of the guide protrusion 27 and are pushed apart against the elastic force.
The tips 22a, 23a of the teeth 1 of both reels 5, 6
5 and 16 are meshed.

However, in the conventional tape cassette constructed as described above, the following problem occurred when the two reels 5 and 6 were locked and unlocked by the two locking claws 22 and 23 of the sliding member 17.

First, when both reels 5 and 6 are locked by both locking pawls 22 and 23, if one reel 5 or 6 is forcibly rotated in the direction of arrow c or d, the locking occurs. Since the pawl 22 or 23 is formed thin, it will bend significantly as shown by the two-dot chain line in FIG. In some cases, the locking pawl 22 or 23 may be damaged, making it impossible to lock the reel 5 or 6.

Next, both the locking claws 22 and 23 are pushed apart by the guide protrusion 27, so that the tips 22a and 23a of both the locking claws 22 and 23 are connected to the teeth 15 and 1 of the reels 5 and 6.
Although it is devised to ensure that it meshes with 6,
Both of the thin locking claws 22 and 23 are susceptible to deterioration over time, and may become plastically deformed while being pushed apart by the guide projection 27. In this state, even if the sliding body 17 is slid in the direction of arrow b, which is the unlocking direction, both the locking claws 22 and 23 are elastic and do not shrink inward. The tips 22a and 23a will not come off the teeth 15 and 16 of both reels 5 and 6. Even though both reels 5 and 6 were unlocked, both locking claws 22 and 23
Tips 22a, 23a of the teeth 1 of both reels 5, 6
5 and 16, the worst defect was likely to occur, which would hinder the rotation of the reels 5 and 6 during tape running.

Purpose of the invention The present invention aims to provide a tape cassette that can correct the above-mentioned defects.

Summary of the invention In the tape cassette described in FIGS. 1 to 3, the sliding body is arranged between a pair of parallel guide walls provided on the cassette half, and The sliding member is configured to be guided by the guide wall, and the tip portions of both guide walls are bent inwardly so that the sliding member slides in a direction opposite to the intermediate portion side against the urging means. When the sliding body is moved, the locking pawls are compressed inwardly at the both ends thereof against elasticity, and the both ends constitute a stopper that restricts the sliding of the sliding body toward the intermediate part side. , a pair of restricting portions extending from the tips of the guide walls to the outside of the locking claws are integrally provided, and these restricting portions prevent the locking claws from deflecting outward. This tape cassette is characterized in that it is configured to restrict the locking and unlocking of the reel, and also prevents breakage of the locking pawl, thereby increasing the reliability of the tape cassette. can be made extremely high.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described with reference to FIGS. 4 to 8. Note that the same structural parts as those of the conventional example shown in FIGS. 1 to 3 are given the same reference numerals, and their explanations are omitted.

That is, in this tape cassette, as shown in FIGS. 4 to 6, a pair of parallel guides that are integral with the bottom wall 3a and the rear wall 3b of the lower half 3 are provided on the rear side of the intermediate portion 18 of both reels 5 and 6. Walls 30, 31 are provided. Tape guide walls 32 and 33 are integrally formed on the outside of both guide walls 30 and 31, and tip portions 30a and 33 of both guide walls 30 and 31 are integrally formed.
1a is bent inward along the tape guide walls 32, 33. On the other hand, the sliding body 34 is formed of synthetic resin into a rectangular parallelepiped shape, and a pair of left and right locking pawls 35 and 36 that mesh with the teeth 15 and 16 are provided at the front end of the sliding body 34. There is. These locking claws 35, 36 are integrally molded with a sliding body 34 made of synthetic resin, and
It is thinly molded to have appropriate elasticity. And both locking claws 35 and 36 are attached to these tips 3.
They are formed in an arcuate or inclined shape so that the distance between them increases as they reach 5a and 36a.
The locking claws 35 and 36 are located at the front corner of the sliding body 34.
Slanted surfaces 37 and 38 are formed on the outside of the surface. The sliding body 34 is guided by both guide walls 30 and 31 and is slidable in the front-rear direction (directions of arrows e and f in FIGS. 5A and 5B, respectively) so as to be able to move in and out of the intermediate portion 18. It is said that The compression spring 21, which is the urging means, is housed between the guide walls 30 and 31 with both ends of the compression spring 21 in contact with the rear end of the slider 34 and the rear wall 3b of the lower half 3, respectively. Note that the rear end portion of the compression spring 21 is sandwiched between the pitches of the compression spring 21 by a pair of spring locking ribs 39 and 40, which are provided integrally with both guide walls 30 and 31, respectively, against elasticity. This ensures that it is locked in place.

According to the tape cassette constructed as described above, first, as shown in FIG. 5A, the tips 35a, 36a of both the locking claws 35, 36 engage with the teeth 15, 16 by the biasing force of the compression spring 21; Rotation of both reels 5 and 6 in the tape feeding direction, which is the direction of arrows g and h, is prevented. And for example one reel 5
or 6 is subjected to a forced rotational force in the direction of arrow g or h, the locking claw 35 or 36
is the tip end 30a or 31 of the guide wall 30 or 31
It is regulated in the state shown by the imaginary line by a, and will not bend any further. Therefore, the reel 5 or 6 can no longer rotate in the direction of the arrow g or h, and the locking pawl 35 or 36 will not be damaged.

Next, when the tape cassette 1 is installed in the cassette mounting position of the video tape recorder and the push button for tape running operation is operated, the sliding body 34 resists the compression spring 21 and moves as shown in FIG.
the tips 35 of both locking claws 35, 36.
a, 36a come off from the teeth of both reels 5, 6.
At this time, both the locking claws 35 and 36 are connected to both the guide walls 30 and 3.
1, both locking claws 35,
Even when the tips 36 are greatly bent, the tips 35a and 36a can be reliably removed from the teeth 15 and 16. In addition, in order to forcibly shrink both the locking claws 35, 36, even if the moving distance i of the sliding body 34 is small, the tips 35a, 3 of both the locking claws 35, 36
The distances j and k by which the reels 6a come off (escape) from the teeth 15 and 16 can be set sufficiently large, and both reels 5 and 6 can be reliably unlocked.

Next, when the stop button is operated, the sliding body 34 is moved back in the direction of arrow e by the compression spring 21, as in the conventional case, as shown in FIG.
The tips 35a, 36a of the reels 36 are meshed with the teeth 15, 16 of the reels 5, 6, thereby locking the reels 5, 6 again. In this case, the slopes 37 and 38 at the front end corners of the sliding body 34 are connected to both guide walls 30 and 31.
The tip portions 30a, 31a of the Therefore, the tips 30a, 31a of both the guide walls 30, 31 act as stoppers for the sliding body 34, and the tips 35a, 36a of both the locking pawls 35, 36 engage the teeth 1.
5, 16, both locking claws 35, 3
No excessive force is applied to 6, and both locking claws 3
5 and 36 can be prevented from being bent more than necessary.

FIGS. 7 and 8 show the main parts of the tape cassette of the present invention, in which regulating parts 42 and 43 are bent further outward from the tips 30a and 31a of both guide walls 30 and 31. It is formed in one piece. According to the regulating portions 42 and 43, the deflection of both the locking claws 35 and 36 due to the forced rotational force acting on both the reels 5 and 6 can be more reliably regulated. In the modified example, a step 44 is formed on the rear wall 3b of the lower half 3 between the guide walls 30 and 31, and the rear end of the compression spring 21 is inserted under the step 44 to ensure secure engagement. is configured to be stopped.

Application Examples Although the embodiments of the present invention have been described above, the present invention can be applied to tape cassettes for various recording and reproducing devices other than video tape recorders and various other information processing devices.

Effects of the Invention As described above, the present invention includes a pair of guide walls that guide the sliding body, each of which has its tips bent inward.
When the reel is unlocked, the pair of locking pawls are forcibly retracted at both tips, and when the reel is locked, the pair of locking claws are configured as stoppers for the sliding body, and A pair of regulating portions are integrally provided extending from the tip of the guide wall along the outside of both of the locking claws, and these regulating portions restrict outward deflection of both of the locking claws. It is composed of Therefore, the locking and unlocking of the reel can be ensured, and in particular, it is possible to reliably prevent both of the locking claws from being bent greatly outward (in the direction of moving away from each other) and being damaged. The reliability of the system can be made extremely high.

[Brief explanation of the drawing]

1 to 3 show conventional examples of tape cassettes for video tape recorders.
The figure is a plan view with a part of the upper half of the tape cassette cut away, FIG. It is a sectional view taken along the - line in the figure. 4 to 8 show an embodiment of a tape cassette for a video tape recorder to which the present invention is applied, in which FIG. 4 is a partially exploded perspective view, and FIG.
Figures A and 5B are partially enlarged plan views illustrating locking and unlocking of both reels by both locking pawls, Figure 6 is a sectional view taken along the - line in Figure 5A, and Figure 7 is a diagram showing the present invention. FIG. 8 is a sectional view taken along the - line in FIG. 7. In addition, in the symbols used in the drawings, 1...tape cassette, 3...lower half, 5, 6...reel, 15, 16...teeth part, 18...middle part, 21
... Compression spring, 30, 31 ... Guide wall, 30
a, 31a... Tip of the guide wall, 34... Sliding body, 35, 36... Locking claw, 35a, 36a...
Tip of locking claw, 37, 38... slope, 42, 43
...Regulatory Department.

Claims (1)

[Scope of Claim for Utility Model Registration] A toothed portion is formed on the outer periphery of a pair of rotatably housed reels, and a sliding member is provided so as to be able to move in and out of the intermediate portion of both reels. This sliding body is provided with a pair of elastic locking pawls that engage with the teeth, respectively, and the spacing between the two locking pawls is formed such that the distance between them increases as they reach their tips. By pressing the sliding body with the biasing means and sliding it toward the intermediate portion, both of the locking claws are engaged with both of the teeth, thereby regulating the rotation of both of the reels in the tape feeding direction. In the tape cassette constructed as shown in FIG. The tip of the guide wall is bent inward, and when the sliding body is slid against the biasing means to the side opposite to the intermediate portion, the two locking claws are bent inward. The stopper is configured to compress inwardly against elasticity, and the both ends of the guide wall constitute a stopper that restricts sliding of the sliding body toward the intermediate part, and the locking claws are connected to the ends of the guide walls. 1. A tape cassette, characterized in that a pair of restricting portions further extended along the outside of the tape cassette are integrally provided, and these restricting portions restrict outward deflection of both of the locking claws.