JPS5843112Y2 - tape cassette - Google Patents

Description

[Detailed description of the invention] This invention prevents the tape reel from rotating freely when not in use, and prevents the magnetic tape wound on the tape reel from becoming loose. Regarding a tape cassette equipped with a reel brake device, in particular, the assembly of the spring provided to apply a biasing force to the reel brake device achieves automation of work, and the assembly ensures reliable retention of the spring during work. This is an attempt to ensure fixation.

By the way, the conventional reel brake device as described above,
It is installed in a tape cassette with the configuration shown in FIG.

To explain this configuration in detail, a reel locking member 3, which is a pressing member that suppresses and locks the tape reel 2 on which the magnetic tape 1 is wound and prevents rotation of the tape reel 2, is attached to the lower nozzle of the tape cassette. A spindle 5 is installed near the tape reel 2 of the first cassette shell 4.
A boss portion 6 is fitted into the support shaft 5, and the support shaft 5 is rotatably attached to the support shaft 5.

The tip of the reel locking member 3 facing the boss portion 6 engages with a notch recess 9 formed on the outer circumferential edge of the flange portion 8 of the chief reel 2, so that the tape reel 2 can be locked when the tape cassette is not in use. A curved lock pawl 7 is formed to act as a lock, and a tape guide 11 is attached to the tape reel 2 side near the boss portion 6 via a support piece 10.

A spring 12 as shown in FIG. 2 is disposed at the tip of the support shaft 5 into which the boss portion 6 is fitted.

In this spring 12, the annular part 12a at the center was fitted onto the support shaft 5, one end 12b was brought into contact with one side of the tape guide 11, and the other end 12c was planted from the first cassette shell 4. It is disposed in contact with the stopper pin 13 and urges the reel lock member 3 in the direction of the tape reel 2 so that the lock pawl abuts and engages with the notch recess 9 of the tape reel 2.

A tongue piece 19 for rotation is provided on the side of the reel lock member 3 opposite to the side on which the tape guide 11 is attached.

This tongue piece 19 is connected to an opening 14 from which the magnetic tape 1 is pulled out when the tape cassette is installed in a recording/reproducing apparatus.
When the cassette cover 15 is opened when the cassette cover 15 is not in use, the cassette cover 15 is pressed and rotated by an operating piece 17 protruding from a rotation shaft 16.

That is, when the tape cassette is attached to the recording/reproducing apparatus, which is when the cassette cover 15 is rotated against the spring 1B wound around the rotation shaft 16, the tongue piece 19 is moved by the actuation piece 17. By pressing in the direction of arrow X, the reel lock member 3 is rotated about the support shaft 5 so as to be separated from the tape reel 2, and the lock claw 7 is released from the recess 9 of the tape reel 2.

It is extremely difficult to completely automate the assembly of a tape cassette having a reel brake device configured as described above.

That is, since the spring 12 disposed to apply a biasing force to the reel lock member 3 is a small helical spring as shown in FIG. Even if an attempt is made to pick up the tape guide and place it at a predetermined location, the parts extending from the annular portion 12a will become entangled with each other, making it impossible to assemble the tape.

Therefore, manual installation is required.
This hinders the automation of tape cassette assembly.

Therefore, in order to solve the above-mentioned drawbacks, the applicant of the present application has replaced the helical spring with a coil spring that can be assembled by an automated machine, so that the assembly of the tape cassette can be completely automated. Similarly, a reel locking member rotatably mounted in the cassette shell and a position facing the reel locking member in the cassette shell each have spring locking portions facing each other, and a spring locking portion is formed between these locking portions. We have proposed a tape cassette equipped with a reel brake device configured to provide a biasing force in the tape reel direction to the reel lock member by disposing a coil spring on the reel. This was proposed for the purpose of achieving reliable holding and fixing and smoother automatic assembly of tape cassettes.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

FIG. 3 shows a state in which a suppressing member for pressing and locking the tape reel is provided near the tape reel on the winding side of the tape cassette.

In this figure, a reel locking member 23, which is a pressing member constituting a reel brake device 20, suppresses and locks a tape reel 22 on which a magnetic tape 21 is wound so that it cannot rotate when not in use, and a tape cassette. The boss portion 2γ having the through hole 26 is fitted onto the support shaft 25 which is planted near the tee 7” IJ-ru 22 of the first cassette shell 24, which is the T portion (T portion) that constitutes the outer casing of the Insert this support shaft 2
It is rotatably attached around 5.

As shown in FIG. 4, the reel lock member 23 rotatably attached to the spindle 25 is attached to -MH of the arm 28 extending from the boss portion 21 fitted into the spindle 25. First and second regulating walls 30.31 provided opposite each other and to which at least one end 29a of the coil spring 29 is locked.
A first spring locking portion 33 having a bottom wall 32 and a bottom wall 32 is formed.

Further, on the upper part of the first spring locking part 33 facing the bottom wall 32, a protrusion 34 for locking the coil spring 29 is provided on the arm part 28 so as to cover a part of the locking part 33. It is installed protruding from.

By providing this projecting piece 34, the coil spring 2
This prevents one end 29a of spring 9 from coming off from the first spring locking portion 33.

A lock pawl 3 is provided at the tip of the arm portion 28 and is curved in the opposite direction to the locking portion 33 and engages with an engaging recess 36 carved in the outer peripheral edge of the flange portion 35 of the tape reel 22.
7 is formed.

When the tape cassette is installed in the recording/reproducing device, the magnetic tape 21
A cassette cover 410 that covers the opening 40 from which the cassette is pulled out when not in use is pressed and rotated by an actuating piece 43 protruding from the rotation shaft 42, and when assembled, it is inserted into the bottom wall 44 of the first cassette shell 24. The tongue-shaped piece 46, which is an abutting part that relatively contacts the upright pin-shaped locking part 45 and restricts the rotation of the reel locking member 23 in the direction in which the tape reel 22 is disposed, is perpendicular to the arm part 28. It is set in.

Further, near the boss portion 27, a tape guide 48 is integrally attached in parallel with the boss portion 2γ via support pieces 47°47.

As shown in FIG. 3, the reel locking member 23 formed in this manner is attached to the support shaft 2 with the lock claw 37 facing the engagement recess 36 of the flange 35 of the tape reel 22.
The locking portion 33 is attached to the side wall 49 of the first cassette shell 24 so as to face the first spring locking portion 23 provided on one side of the reel locking member 23 when the reel locking member 5 is inserted into the reel lock member 23. Similarly, the first and second regulating walls 50 are provided opposite to each other and the other end 29b of the coil spring is locked.
．． 51 and a bottom wall 52.
3 will be provided.

, Moreover, on the upper part of this second spring locking part 53,
The other end 2 of the coil spring 29 covers a part of this
A protruding piece 54 for locking the spring 29 is provided, and the action of the protruding piece 54 restricts the free upward removal of the spring 29.

The first and second spring locking portions 33, 5
When a coil spring 29 with closed ends at both ends as shown in FIG. The lock pawl 37 engages with the engagement recess 36 formed in the flange portion 35, and acts to lock the tape reel 22 and stop its rotation.

Here, the reason why the coil springs 29 with closed ends is used is to prevent the coil springs 29 from becoming entangled with each other when aligned using a pirn feeder, etc., and to smoothly separate the coil springs 29 even if they are entangled.

To assemble the reel brake device 20 configured as described above, before attaching the cassette cover 41 and tape reel 22 to the first cassette shell 24, the lock claw 3
The reel lock member 23 is fitted onto the support shaft 25 as shown in FIG. 6, with the reel lock member 7 facing toward the tape reel 22.

As shown in FIG. 6, the reel lock member 23 disposed on the first cassette shell 24 and the coil spring 2
9 is disposed between the first and second spring locking portions 33 and 53, when the tape reel 22 is mounted, the tongue-shaped piece 46 comes into relative contact with the locking portion 45 when the tape reel 22 is rotated to the side, and the tape reel 22 Once installed, rotation in the lateral direction is prevented.

When the tongue-shaped piece 46 and the locking part 45 come into relative contact with each other and the rotation of the reel long member 230 is prevented, the end edge of the protrusion 34 that is attached to the first spring locking part 33 and the second spring The distance A between the locking portion 53 and the edge of the protruding piece 54 is greater than the length A2 of the coil spring 29 disposed here when the coil spring 29 is normally extended without receiving any urging force. is also at least small.

That is, the tongue-like piece 46 and the locking portion 45 abut each other at a position where the distance A1 between the first and second spring locking portions 33 and 53 is not greater than at least the length A of the coil spring 29. Reel long member 230
The reel lock member 23 and the first cassette shell 24 are respectively provided to once prevent rotation.

By the way, if the distance A1 between the first and second spring locking portions 33 and 53 is smaller than the length A2 of the coil spring 29 as described above, the coil spring 29 may not be disposed between the locking portions 33 and 53. Even if this is attempted, the coil spring 29 must be compressed, which is extremely difficult to do automatically by an automatic machine such as a parts assembly robot.

Therefore, the pin-shaped locking portion 45 is formed to have an elongated shape, have equal flexibility, and be bendable.

Then, from the state in which the locking portion 45 and the tongue-shaped piece 46 come into contact and the rotation of the reel locking member 23 is once blocked, a portion of the locking pawl 37 of the reel locking member 23 is further restrained by a predetermined suppressing means. The reel locking member 23 is forcibly rotated in the direction in which the tape reel 22 is disposed.

Then, the locking portion 45 is attached to the tongue-shaped piece 4 as shown in FIG.
6, the reel lock member 23 is tilted toward the bottom wall 44 by the base end of the reel lock member 23, and the reel lock member 23 has at least the width W where the locking portion 45 is tilted.

The tape reel 22 is rotated in the direction in which the tape reel 22 is disposed.

In this way, the distance between the first and second spring locking parts 33 and 53 is expanded by the forced rotation of the locking member 23.

Therefore, the first and second spring locking parts 33 and 53
The locking portion 45 is formed with flexibility to ensure a bending width W1 such that the reel lock member 23 can be rotated in a case where the distance between the locking portions is at least larger than the length A2 of the coil spring 29.

By forming the locking portion 45 in this manner, if the reel lock member 23 is further forcibly rotated after the tongue piece 46 abuts the locking portion 45, the first and second The distance A3 between the spring locking portions 33 and 53 is larger than the length A2 of the coil spring 29, as shown in FIG.
will have the following.

Then, the reel lock member 23 is held in the forcibly rotated state shown in FIG. If it is disposed between the spring locking portions 33 and 53, the disposing work can be easily performed without compressing the spring 29 or the like.

When the pressing force of the suppressing means is released after the coil spring 29 has been disposed, the restoring force of the locking part 45 presses the tongue part 46, and the reel locking member 23 locks into the first cassette shell 24. It rotates toward the side wall 49 and returns to the rotation blocking position as shown in FIG.

The first and second spring locking portions 33 and 53
The distance A is smaller than the length A2 of the coil spring 29.
1, compressing and holding the spring 29 and preventing it from coming off in conjunction with the action of the protrusions 34, 54 of the first and second spring locking parts 33 and 53.

In the above example, the locking portion 45 is formed to be bendable so that the distance between the first and second spring locking portions 33 and 53 can be wider than the length A2 of the coil spring 29. However, a portion of the tongue portion 46 provided on the reel locking member 23 side that contacts the locking portion 45 may be formed as a bendable portion so as to have flexibility.

Therefore, FIGS. 9 and 10 show an example in which a part of the tongue-shaped portion 46 is a bendable portion.

In the example shown in FIG. 9, the lower end portion of the tongue-like portion 46 is extended, and this extended portion is used as a flexible bendable portion 55.

In this case, the reel lock release action portion 56 in the upper part of the figure that is pressed by the actuation piece 43 of the assembled rear centrifugal force bar 41 is not bent and is formed wide so as to have sufficient strength. When pressed by the piece 43, the reel lock release action is reliably performed without bending.

Further, in the example shown in FIG. 10, the reel lock release action section 5
6 cannot be formed wide enough to obtain sufficient strength, 1.1-A reinforcing portion 57 is provided at the boundary between the Ruronok release action portion 56 and the bendable portion 55 to release the reel lock. The operating portion 56 is formed to maintain sufficient strength without being bent by the pressing action of the operating piece 43.

By providing such a bendable portion 55 on the reel locking member 23 side, the same effect as in the case where the locking portion 45 described above is made bendable can be obtained.

As shown in FIGS. 11 and 12, at the point where the bendable portion 55 comes into contact with the locking portion 45, the reel lock member 2
3 in the direction in which the tape reel 22 is disposed by a predetermined suppressing means, the bendable portion 55 bends and the reel locking member 23 locks the tape reel 22 by at least the bending amount W2 of the bendable portion 55. Rotate in the installation direction.

If the bending amount W2 is set to be sufficient to make the distance A3 between the first and second spring locking portions 33 and 53 larger than the length A2 of the coil spring 29, as in the case described above, As described above, the coil spring 29 can be easily installed by an automatic machine such as a parts assembly robot.

Furthermore, when the pressing force by the predetermined pressing means is released after the coil spring 29 is disposed, the reel locking member 23 is rotated in the direction of the side wall 49 of the first cassette shell 24 due to the restoring force of the bendable portion 55. The coil spring 29 is compressed between the first and second spring locking parts 33 and 53.
The distance A1 is smaller than the length A2, and the coil spring 29 is compressed and held.

Note that when the bendable portion 55 is provided on the tongue-like piece 46,
As shown in FIG. 12, the locking portion 45 is formed with a low protrusion so that it can abut only the tip on the free end side so as not to interfere with the bending action of the bendable portion 55. It is constructed with sufficient strength so that it cannot be bent due to the suppressing action of the reel lock member 23.

As described above, the rotation of the reel lock member 23 is caused by the locking portion 45.
The distance A1 between the first and second spring locking portions 33 and 53 is smaller than the length A2 of the coil spring 29, and if necessary, the distance A2 is smaller than the length A2 of the coil spring 29. Since the distance A3 between the first and second spring locking portions 33 and 53 can be set larger than the length A2 of the coil spring 29, the coil spring 29
Not only is it possible to automatically incorporate the tape reel 22
It is possible to simply assemble the coil spring 290 and hold and fix the spring 29 at the same time without assembling the coil spring 290 or the like.

Next, when installing the tape reel 22, the reel locking member 23 is moved against the coil spring 29 and attached to the side wall 49.
Width in direction as shown in Figure 13.

By rotating it only by a certain amount, it can be assembled without coming into contact with the lock claw 37.

Furthermore, when a second cassette shell and a cassette cover 41 (not shown) are assembled as a tape cassette,
When the cassette cover 41 is not in use and is biased in the closing direction by the spring 58, the reel lock member 2
3 is biased toward the tape reel 22 by the coil spring 29 while the contact between the tongue 46 and the engagement portion 45 is released, and the lock claw 37 engages with the engagement recess 36 of the flange portion 35 of the tape reel 22. Then, the rotation of the tape reel 22 is locked.

When the tape cassette having the reel brake device 20 attached and configured in this way is attached to a recording/reproducing device, the reel locking member 23 rotates as the cassette cover 41 rotates in the opening direction. The tongue-shaped piece 46 is pressed by the operating piece 43 protruding from the moving shaft 42 as shown in FIG. 14 and moves together around the support shaft 25, and the lock pawl 37 is activated as shown by the broken line in FIG. Tape reel 22
The tape reel 22 is released from the engagement recess 36 and becomes free to rotate.

As mentioned above, according to the present invention, since the spring can be securely held at the same time as the spring is assembled, it is possible to prevent the spring from falling off during the assembly of the tape cassette, and not only can the assembly of the tape cassette be completely automated, but also the assembly can be significantly simplified. It is possible to improve work efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing how a tape reel and reel locking member are attached in a conventional tape cassette, and FIG. 2 is a perspective view showing a spring used therein. FIG. 3 is a plan view showing how the tape reel and reel locking member are attached in the tape cassette according to the present invention, FIG. 4 is a perspective view of the reel locking member used in the present invention, and FIG. 5 is the same. FIG. 6 is a front view of the coil spring, FIG. 6 is a plan view showing a state in which the reel lock member is assembled into the first cassette shell, and FIG. FIG. 8 is a plan view showing a state in which it is assembled, and FIG. 8 is a side sectional view showing the above state. 9 and 10 are perspective views showing other examples of the reel lock member, respectively, and FIG. 11 shows the reel lock member shown in FIG. 10 being assembled into the first cassette shell and forcibly rotated. 12 is a plan view showing a state in which a coil spring is installed, and FIG. 12 is a side sectional view showing the above state. FIG. 13 is a plan view showing the operating state of the reel locking member assembled into the first cassette shell, and FIG. 14 is a partial side sectional view of the cassette bar with the lid closed. 20... Reel brake device, 22...
・Chief reel, 23... Reel lock member,
24...first cassette shell, 29...
...Coil spring, 33...First spring locking part, 45...Locking part, 46...
- Tongue-shaped piece, 53... second spring locking part,
55...Bendable portion provided on the tongue.

Claims (3)

[Scope of utility model registration request] (1) A suppressing member that is rotatably attached to the cassette shell and presses a reel on which magnetic tape is wound, and a spring locking portion that faces each other at a position in the cassette shell that faces the suppressing member. A reel brake device is provided in which a coil spring is disposed between these locking portions to apply a biasing force in the reel direction to the suppressing member, and a contact portion provided on the pressing member and the cassette shell are provided. A tape cassette characterized in that when the respective locking portions are in relative contact with each other, the distance between the locking portions is at least smaller than the total length of the coil spring. (2) The tape cassette according to claim 1, wherein the locking portion is bendable. (3) The tape cassette according to claim 1, wherein the suppressing member is provided with a bendable portion.