JPS6025735Y2 - endless tape cassette - Google Patents

Description

[Detailed description of the invention] The present invention stores endlessly connected tapes in a bent state in a cassette housing, and the tape pulled out from the cassette housing is transported to the cassette housing by a reel for drawing in the tape. This relates to an endless tape cassette that is retractable.

(2) When a relatively short video is repeatedly played back using an endless tape cassette for TR, it is very convenient to use an endless tape cassette.

In this type of cassette, as shown in FIG. 1, an endlessly connected magnetic tape 1 is stored in a cassette housing 2 in an irregularly bent state, and the magnetic tape 1 is removed from the cassette housing 2. The magnetic tape 1 is sequentially pulled out and played, and then the magnetic tape 1 is pressed by a pressing member 5 onto a drawing reel 4 around which a friction member 3 made of rubber or the like is wound around the outer periphery, and the magnetic tape 1 is drawn into the cassette housing 2. It is configured as follows.

That is, as the reel 4 rotates forward in the direction of arrow A (see FIG. 1), the magnetic tape 1 is pulled into the cassette casing 2 by the force of frictional engagement with the friction member 3, and then The drawn-in magnetic tape 1 is separated from the outer peripheral surface of the reel 4 by a separating member 6 made of synthetic resin such as Mylar film so that it does not wrap around the peripheral surface of the reel 4.

Further, in this type of cassette, a reverse rotation prevention lever 8 is rotatably attached to the support shaft 7 in order to prevent the reel 4 from rotating in the reverse direction.

This reverse rotation prevention lever 8 is combined with the separating member 6 as shown in FIG.

On the other hand, a tape guide member 10 is attached to the rib 9 of the cassette housing 2, as shown in FIG. is pressed and lightly pressed into engagement with the outer peripheral surface of the reel 4.

Therefore, when the pull-in reel 4 reversely rotates in the direction of arrow B in FIG. It is rotated about the shaft 7 in the direction of the arrow.

Therefore, the bent piece 8a of the reverse rotation prevention lever 8 comes into contact with the friction member 3, as shown by the imaginary line in FIG. 1, to prevent the waist pulling reel 4 from rotating in the opposite direction.

However, in such conventional endless tape cassettes, as the cassette is used many times, dust etc. may adhere to the circumferential surface of the friction member 3, or magnetic powder may fall from the magnetic layer of the magnetic tape 1, causing friction. If it adheres to the circumferential surface of the member 3, the frictional engagement force between the friction member 3 and the separation member 6 will decrease, and even if the reel 4 rotates in the opposite direction, the reverse rotation prevention lever 8 will not be activated. There is a possibility that the normal operation as described above may not be performed.

Moreover, when the endless tape cassette is removed from the VTR main body, the reel 4 for retraction changes and the pressure force of the separation member 6 against the friction member 3 is weakest when it is farthest from the spindle 7; If the pull-in reel 4 unexpectedly rotates in a reverse direction, there is a possibility that the reverse rotation of the pull-in reel 4 cannot be prevented.

If the reverse rotation prevention lever 8 does not operate normally, the magnetic tape 1 will get stuck between the friction member 3 and the separating member 6 when the retraction lever 4 rotates in reverse, and the magnetic tape 1 will be damaged. In the worst case, the magnetic tape 1 and, by extension, the cassette may not be reusable.

Therefore, in order to eliminate such inconvenience, the separation member 6
By making the separation member 6 of a material with a large elastic modulus and strongly pressing the separation member 6 against the friction member 3 of the reel 4, the reverse rotation of the reel 4 caused by the reverse rotation prevention lever 8 can be reliably prevented. However, when configured in this way, other disadvantages occur.

That is, in this case, when the separating member 6 is strongly pressed against the outer peripheral surface of the friction member 3, the pressing force of the separating member 6 acts as a braking force (load torque) against the reel driving force.

Therefore, when the magnetic tape 1 is drawn into the cassette housing 2, the forward rotation of the drawing reel 4 becomes uneven and the rotational speed becomes slow, causing the magnetic tape 1 to become loose. This causes an inconvenience in that the stop device is activated and the tape running of the magnetic tape 1 is stopped.

The present invention was developed in view of the above-mentioned actual situation, and the member for driving the reverse rotation prevention member when the retracting reel rotates in reverse is crimped onto the retracting reel with a relatively weak pressing force. Nevertheless, the present invention provides an endless tape cassette that can reliably prevent the reel from rotating in reverse.

An embodiment in which the present invention is applied to an endless tape cassette for a VTR will be described below with reference to FIGS. 4 to 9.

First, an endless tape cassette for a VTR will be explained with reference to FIG. 4. An opening 13 is provided on the front side of a cassette housing 12 made of wood, and a front lid 14 that opens and closes the opening 13 is rotatable. installed on.

A drawing reel (hereinafter simply referred to as 1 reel) 15 made of, for example, synthetic resin is rotatably housed in a position offset to one side of the cassette housing 12.

Further, a partition wall 17 is integrally molded at a position offset to the other side within the cassette housing 12, and the reel 15 and the partition wall 17 are integrally formed.
A tape storage section 18 is constructed between the two.

On the other hand, a large amount of endlessly connected magnetic tapes (hereinafter referred to as 1 endless tape) 19 are stored in the tape storage section 18 so as to be folded irregularly in a zigzag shape.

And part of this endless tape 19 is part of the partition wall 1.
The tape is pulled out from the slit 20 provided in the cassette case 12 to the other side and the front end side of the cassette case 12, and is passed through the tape guides 21, 22 and 23 provided at both ends of the opening 13, respectively. After being detoured to the front end of one side,
The hook is passed so that it can be wound around the reel 15.

In addition, as shown in FIGS. 4 and 5, the above-mentioned reel 15
A rubber ring 24, which is a type of elastic body, is wrapped around the circumferential surface of the rubber ring 24, and a part of the endless tape 19 is crimped onto the circumferential surface 24a of the rubber ring 24 by a tape pressure bonding member 25.

Furthermore, a separation plate 26 is crimped onto the circumferential surface 24a of the rubber ring 24 at a position on the lower side of the tape crimping member 25 in the forward rotational direction of the reel 15 (direction of arrow A in FIG. 4).

In addition, another part of the endless tape 19 has the slit 2.
It is held at the 0 portion by a pair of holding members 28 and 29.

The tape pressure bonding member 25, separation plate 26, and clamping members 28 and 29 are made of synthetic resin films such as Mylar film, and each has appropriate elasticity.

As shown in FIG. 4, these are mechanically fixed or adhesively fixed to the cassette housing 12 as appropriate.

As the reel 15 rotates forward (rotation in the direction of arrow A), the endless tape 19 is moved toward the cassette casing from the direction of arrow a in FIG. While being drawn into the body 12, the drawn-in endless tape 19 is separated by the separating plate 26 from the circumferential surface 24a of the rubber ring 24 of the reel 15.
The tape is separated from the tape, sent out in the direction of the arrow, and stored in the tape storage section 18.

Further, in this embodiment, a reverse rotation prevention lever 31 is provided to prevent reverse rotation of the reel 15 (rotation in the direction of arrow B in FIG. 4), and the lever 31 is rotated in a predetermined direction when the reel 15 rotates in the reverse direction. A flexible member 32 is provided for each.

As shown in FIGS. 4 and 5, the reverse rotation prevention lever 31 is cut out from a plate-shaped body, and one end thereof is rotatably supported by a support shaft 33 integrally formed with the cassette housing 12, and the other end is A bent portion 31a bent at an acute angle is formed in the portion.

Further, as clearly shown in FIG. 5, the reverse rotation prevention lever 31 has an L-shaped mounting piece 35 on the side surface 31b opposite to the bent portion 31a and in a portion biased toward the bent portion 31a. is integrally molded.

On the other hand, the lever driving flexible member 32 is a flexible plate-shaped body cut from a synthetic resin film such as Mylar film, and as shown in FIG.
A positioning recess 36 is formed in b, and the other end 32a is formed wide.

Further, the cassette housing 12 has a support portion 38 having a recess 37.
is integrally molded, and one end 32b of the lever driving visible member 32 is inserted into this recess 37, and a part of the support part 38 is inserted into the recess 36 of the flexible member 32. It is in a state of

Further, the flexible member 32 is held between a pair of protrusions (not shown) formed on the upper surface of the cassette housing 12 at the portion where the recess 36 is formed.

As a result, the lever driving flexible member 32 is moved to the support body 3.
It is supported in a positioned state by 8.

As shown in FIGS. 4 and 5, the lever driving flexible member 32 extends from the fixed portion by the support portion 38 to the other end portion
2a side, and the tip 32c of the other wide end 32a of the flexible member 32 is bent toward the reel 15.
The rubber ring 24 is pressed into contact with the surface of the rubber ring 24 by its elastic restoring force.

In addition, a part of the flexible member 32 between the portion 32d with the largest curvature and the tip 32c is inserted between the side surface 31b of the reverse rotation prevention lever 31 and the hanging piece 35a of the mounting piece 35. , reverse rotation prevention lever 31 and flexible member 3
2 are slidably connected to each other.

Note that when the reel 15 stops rotating and rotates forward in the direction of arrow A, there is, for example, 2 to 3 Tra between the bent portion 31a of the reverse rotation prevention lever 31 and the circumferential surface of the rubber ring 24 of the reel 15.
An interval of n is formed, and the reel 15 is connected to the reverse rotation prevention lever 3.
1 and rotates without contact.

Next, the reverse rotation prevention operation of the reel 15 by the reverse rotation prevention lever 31 and the lever driving flexible member 32 will be explained.

First, the reel shaft insertion hole (not shown) on the back side of the reel 15.
When the reel 15 is reversely rotated in the direction of arrow B in FIG.
In the figure, it is energized in the direction of arrow E.

At this time, the tip 32c becomes wedged into the circumferential surface 24a of the rubber ring 24 as the rubber ring 24 rotates in the opposite direction.

Therefore, this flexible member 32 is reliably moved in the direction of arrow E when the reel 15 rotates in reverse.

Thereafter, the flexible member 32 moves in the direction of arrow F while being deformed from the position shown by the imaginary line in FIG.

Along with this, the side surface 31b of the reverse rotation prevention lever 31 is pressed by the flexible member 31, so that the reverse rotation prevention lever 31 slides relative to the flexible member 32 while moving on the support shaft. It is rotated in the direction of arrow G about 33.

As a result, the bent portion 31a of the reverse rotation prevention lever 31 is pressed into engagement with the circumferential surface 24a of the rubber ring 24 of the reel 15, as shown by the solid line in FIG.
This will prevent reverse rotation.

As described above, when the flexible member 32 is moved, the tip 32c of the flexible member 32 touches the circumferential surface 24a of the rubber ring 24.
It is in a state where it is slightly dug into.

Therefore, the other end 3 of the flexible member 32 relative to the rubber ring 24
Even if the crimping force of the flexible member 2a is relatively weak and the crimping area (or the width of the tip 32c of the flexible member 32) is, for example, about 172 to 1n compared to the conventional one, the flexible member 32 is During reverse rotation, it will be reliably moved in the direction of arrow F.

Further, when the reel 15 is rotated forward in the direction of arrow A under the condition shown by the solid line in FIG.
Since the tip 32c of the rotor wheel 24 is biased in a direction opposite to the direction of the arrow E from the circumferential surface 24a of the goto ring 24, the flexible member 32 and the reverse rotation prevention lever 31 are moved to the position shown by the imaginary line in FIG. Ru.

As a result, the outer surface of the wheel 24 and the reverse rotation prevention lever 31
The compression engagement with the bent portion 31a is released, and the reel 15 rotates in the normal direction in this state.

With the endless tape cassette configured in this way, the frictional force generated between the tip 32c of the flexible member 32 and the circumferential surface 24a of the rubber ring 24 when the reel 15 rotates in the forward direction increases the braking force (load) of the reel 15. However, since the pressing force of the flexible member 32 against the rubber ring 24 may be relatively weak as described above, this braking force is less than the rotational driving force of the reel 15. It is almost negligible.

Therefore, the fact that the flexible member 32 is crimped onto the rubber ring 24 of the reel 15 has almost no adverse effect, and the reel 15 rotates extremely smoothly and stably.

Also, a reverse rotation prevention lever 31 and a visibility member 3 for driving the lever.
2 are slidably connected to each other, and the flexible member 32 is constructed so that it can be reliably moved when the reel 15 rotates in the opposite direction, so that the reverse rotation prevention lever can be used when the reel 15 rotates in the opposite direction. 31 becomes agile, and as a result, it becomes possible to further improve the reliability of the reverse rotation prevention operation by the reverse rotation prevention lever 31.

Moreover, FIGS. 8 and 9 are for explaining a modification of the above-mentioned embodiment, and in these figures, FIGS.
Components common to those in FIG. 7 are given the same reference numerals and their explanations will be omitted.

In this example, one end 3 of the lever driving flexible member 32
2b is further extended, and a tape pressing member 40 is attached to this one end portion 32b, and the tape pressing member 40 is configured to press the endless tape 19 toward the tape guide 21 side.

This tape pressing member 40 is made from a low friction material having a small coefficient of friction such as an ultra-high polymer film containing carbon, and is attached to one end 32b of a flexible member 32 having a wide width as shown in FIG. It is attached with adhesive.

And between the support part 38 and the tape guide 21,
The flexible member 32 is slightly bent by the post 41, and the tape pressing member 40 described above is urged toward the tape guide 21 by the elastic restoring force of the flexible member 32.

On the other hand, the endless tape 19 is disposed between the tape guide 21 and the tape pressing member 40, and is constantly held by these with a relatively weak holding force.

Note that the other configurations may be completely the same as those of the previously described embodiments.

The endless tape cassette constructed in this way has the same advantages as those of the previously described embodiments, and also suppresses the slack of the endless tape 19 inside the cassette housing 12 when the reel 15 rotates in reverse. is possible,
There is no possibility that the front part of the cassette will become loose.

That is, when the reel 15 rotates in the reverse direction in the direction of arrow B, the endless tape 1
9 becomes slack as shown by the imaginary line in FIG. No slack occurs in the opening 13 portion of the cassette housing 12.

Therefore, when the endless tape cassette is attached to or removed from the VTR main body, there is no possibility that the endless tape 19 will be damaged due to opening and closing of the front cover 14 of the cassette.

In the past, a special member was provided specifically for preventing tape loosening, but since this type of member is attached to the flexible member 32 as the tape holding member 40, it is possible to reduce the cost of the endless tape cassette. At the same time, it is possible to improve the reliability of the cassette.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to these embodiments, and various modifications can be made based on the technical idea of the present invention.

For example, in the embodiment described above, the attachment piece 35 is provided on the reverse rotation prevention lever 31 to attach the lever driving flexible member 32, but the invention is not limited to this. Any attachment structure may be used as long as the sexual members 32 are slidably connected to each other.

Further, although the embodiment is applied to an endless tape cassette for a VTR, the present invention can also be applied to an endless cassette for a tape recorder.

As described above, the present invention deforms the visible member by biting the tip of the flexible member into the elastic body wrapped around the reel when the reel rotates in reverse. As a result, the reverse rotation prevention member, which is slidably connected to the flexible member, is crimped onto the reel to prevent reverse rotation of the reel.

Therefore, with the endless tape cassette of the present invention, even if the pressure force of the flexible member against the elastic body is very weak, under any conditions (
For example, even if dust or the like adheres to the elastic body, it is possible to always rotate the reverse rotation prevention member reliably, and the reliability of the reverse rotation prevention operation of the pull-in reel can be improved.

In addition, since the above-mentioned crimping force can be made extremely weak compared to the conventional one, the braking force (load torque) received from the flexible member when the reel for retraction rotates forward can be made extremely small, and as a result, the This has the advantage that the rotation of the reel becomes smooth and tape running is stabilized.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional endless tape cassette for a VTR. A perspective view of the main parts of the endless tape cassette, FIG. 3 is a plan view of the tape guide member, and FIGS. 4 to 7.
The figures show an embodiment in which the present invention is applied to an endless tape cassette for a VTR, in which FIG. 4 is a partially cutaway plan view of the endless tape cassette, and FIG. FIG. 6 is a perspective view of the main parts of the tape cassette, FIG. 6 is a plan view of the flexible member for driving the lever, and FIG. 7 explains the operation of the reverse rotation prevention lever and the flexible member when the reel for retraction rotates in reverse. FIGS. 8 and 9 show a modified example of the above embodiment. FIG. 8 is a partially cutaway plan view of the endless tape cassette, and FIG. 9 is a partially cutaway plan view of the endless tape cassette. FIG. 3 is a plan view of the flexible member. In addition, in the symbols used in the drawings, 12...
...Cassette housing, 15...Retraction reel,
19... Endless tape, 24...
Rubber ring, 31... Reverse rotation prevention lever 32...
. . . Visibility member, 33 . . . Support shaft.

Claims (1)

[Scope of utility model registration request] In the endless tape cassette, the endless tape cassette is stored in a bent state in a cassette casing, and the tape pulled out from the cassette casing is drawn into the cassette casing by a reel for drawing. an elastic body wrapped around the circumferential surface of the reel for retraction; a reverse rotation prevention member rotatably attached to the cassette casing about a spindle; and one end or middle part of the cassette casing. The part on the other end side from this fixed part is bent and the other end is crimped to the circumferential surface of the elastic body, and a part of it between the fixed part and the other end is bent. and a flexible member slidably connected to the rotation prevention member, and when the reel for retraction rotates in reverse, the other end of the flexible member bites into the elastic body and the flexible member The sexual member deforms as the reel rotates in the opposite direction, thereby causing
An endless tape cassette, characterized in that the reverse rotation prevention member is configured to be crimped onto the reel to prevent reverse rotation of the reel.