JPH0527878U - Magnetic tape cassette - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To improve workability by enabling the assembly of a magnetic tape cassette with adjustable recording / playback time in an automatic assembly line for mass production. [Structure] A magnetic tape 2 is wound and housed in a cassette case 1 around a pair of rotatable reels 3 and 4, and an interlocking operation is provided on the reel 3 with an adjusting button 6 for stopping tape feeding and a control pin 7. In the magnetic tape cassette provided with the plate 5, the locking portion 9 for rotatably fitting the interlocking plate 5 is provided on the reel 3 so that the recording / playback time can be adjusted. It can be easily incorporated into an automatic assembly line for mass production, greatly improving production efficiency,
A magnetic tape cassette with a simple and inexpensive structure that can reduce costs by reducing the number of parts can be provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape cassette equipped with a winding drum capable of adjusting the recording / reproducing time of the tape and a switching interlocking plate in a tape cassette in which magnetic tapes such as audio are wound and housed. ..

[0002]

[Prior Art]

 Conventionally, the tape cassette itself is capable of freely adjusting the recording / reproducing time, and the one previously proposed by the present applicant (Japanese Patent Application No. 2-72496) has a control button and a recess in the tape supply reel. The interlocking plate with the tape control pin is rotatably fitted, and the adjusting button is engaged with and disengaged from the connecting convex part provided in the recess, so that the supply reel and the interlocking plate can rotate integrally or relatively. There are tape cassettes that stop the tape feeding at a predetermined position.

[0003]

[Problems to be solved by the device]

 However, in order to loosely fit and support the interlocking plate that engages and disengages with the supply reel for stopping the feeding of the tape at an arbitrary position in the length direction of the tape, there is a restriction in the axial direction. If not done, the control pin fixed to the interlocking plate will slip when wound on the tape, rubbing the tape at the control pin and damaging the tape, and another such as a ring pin that regulates in the axial direction. If the structure is such that the members are fitted on the outer circumference of the inner cylinder of the supply reel, it is complicated to assemble each member as an individual part, and assembly on an automatic assembly line for mass production is troublesome, and the production cost is relatively high. In addition, cost performance deteriorates due to the large number of parts, and production efficiency cannot be increased, which is a problem. The present invention aims to eliminate these drawbacks properly, and it is easy to incorporate in an automatic assembly line to make a magnetic tape cassette that has an interlocking plate that can adjust the recording / playback time on the supply reel. It is an object of the present invention to provide a magnetic tape cassette having a simple structure and a low cost, which can significantly improve the production efficiency and reduce the cost by reducing the number of parts.

[0004]

[Means for Solving the Problems]

 In the present invention, a magnetic tape 2 is housed in a cassette case 1 by being wound around a rotatable supply reel 3 and a take-up reel 4, and the supply reel 3 is provided with an adjusting button 6 for stopping tape feeding and a control pin 7. In the magnetic tape cassette provided with the interlocking plate 5 having an interlocking plate 5, a locking portion 9 for rotatably fitting the interlocking plate 5 is provided on the supply reel 3.

[0005]

[Action]

The interlocking plate 5 in the recess 13 of the supply reel 3 is rotatably fitted by the locking portion 9 so as not to be pulled out in the axial direction, and the adjustment button 6 is formed in the case 1 through the opening. When it is in the first position where it is fitted in 14, the interlocking plate 5 is separated from the supply reel 3 and is in a stationary state, and the end of the control pin 7 is radially outward of the magnetic tape 2. While the supply reel 3 is free to rotate. In this state, the magnetic tape 2 can freely travel back and forth between the supply reel 3 and the take-up reel 4 over the entire length from the start end to the end of the magnetic tape 2 as in the case of a conventional general cassette tape. Further, when the adjustment button 6 is pushed in and moved to the inner surface of the upper case to the second position and the opening 14 is closed by the slide shutter 14 ₁ , the supply reel 3 and the interlocking plate 5 are engaged with the convex portion 15 of the supply reel 3. Rotate together. Since the control pin 7 also rotates at the same time as the rotation of the interlocking plate 5, the end of the control pin 7 which is located away from the outermost peripheral portion of the tape 2 wound around the supply reel 3 also extends tangentially. Move towards the part. When the end of the control pin 7 engages with the tape portion extending in the tangential direction, and the supply reel 3 and the interlocking plate 5 further rotate, the control pin 7 swings around the bearing and the interlocking plate moves. Move along with 5. Therefore, the tangentially extending portion of the tape 2 is pulled in the rotation direction of the supply reel 3 by the end of the control pin 7, so that the tension acting on the tape 2 increases and the tension detection mechanism of the tape recorder (Fig. (Not shown) operates to stop the tape 2 from running.

[0006]

【Example】

 1 to 7, the tape cassette is wound around a cassette case 1 and a pair of a supply reel 3 and a take-up reel 4 which are rotatably housed therein. And a magnetic tape 2 that has been formed. Each of the reels 3 and 4 can be either a supply side or a winding side depending on the running direction of the magnetic tape 2, but the supply reel 3 and the winding reel 4 have a predetermined length with one end fixed respectively. The magnetic tape 2 is wound. The supply reel 3 is integrally formed with a projection extending radially inward at the center thereof to receive rotation from the tape recorder, and a recess 13 is formed inside the winding drum portion of the reel 3. ing. The cylindrical inner wall defining the recess 13 is provided with a plurality of locking projections 15 projecting radially inward at equal intervals, one of which is a tape end fixing portion. Is formed.

An annular interlocking plate 5 is rotatably fitted in the recess 13 of the supply reel 3 by a locking portion 9. The interlocking plate 5 is made of a synthetic resin material and has a cylindrical wall 5.₁An annular flange 5 protruding outward on the upper edge₂And an annular flange portion 5 which is provided at the lower edge so as to project inwardly. ₃ The annular flange portion 5 having a donut shape with₂A control pin 7 is provided on the outer peripheral portion of the upper surface of the, and a support portion 6 is provided on the outer peripheral portion on the diametrically opposite side.₁The adjustment button 6 is integrally formed of a flexible material such as a synthetic resin material or is provided through a spring. In this case, the adjusting button 6 has a sliding projection 6 on the top surface.₂The cam part 6 has a lock part on the bottom surface, which is designed to allow smooth sliding by reducing the contact area when it is pushed in and slipped into the inner surface of the upper case.₃Is formed so that it can come into contact with the convex portion 15 of the recess 13. The adjustment button 6 is an elastic support 6₁The adjusting button 6 rises from the upper surface of the interlocking plate 5 and is bent in the outer peripheral direction so as to project from the interlocking plate 5 via a spring. It is good to be given effectively. Further, it is considered that the ring-shaped interlocking plate 5 is provided with an arcuate cut groove 8 along the outer periphery on the side where the adjustment button 6 is provided, if necessary, to make the flexibility even more effective. .

The control pin 7 has one end rotatably supported in a shaft hole parallel to the rotation axis of the supply reel 3, a part bent at a right angle from the bearing part, and a part parallel to the shaft hole. And an end extending downward. Then, the control pin 7 can be turned around the shaft hole, and its end can be brought into contact with the surface of the magnetic tape 2. The locking portion 9 is an undercut claw protrudingly provided on the outer circumference of the drum inner cylindrical portion 3 ₁ of the supply reel 3 and is formed on the lower edge of the cylindrical wall 5 ₁ of the interlocking plate 5. intended to be engaged in the annular flange portion 5 _3, interlock plate 5 is in the draw-out prevention structure is instrumentation fitted rotatably in the recess 13.

The interlocking plate 5 housed in the recess 13 of the supply reel 3 has its center hole loosely fitted in the inner cylindrical portion 3 ₁ formed in the supply reel 3. _It is positioned in the vertical direction by the locking portion 9 protruding from the position 1 so that it can rotate stably. When the adjusting button 6 is in the first position, that is, when it is fitted in the opening 14 formed in the case 1, the interlocking plate 5 is supplied without engaging with the convex portion 15 formed in the supply reel 3. Relative rotation around the rotation axis of the reel 3 is possible. When the adjustment button 6 is pushed downward to the second position, that is, when the adjustment button 6 also digs into the inner surface of the case 1, the cam portion 6 _{3 on} the bottom surface of the adjustment button 6 provided on the interlocking plate 5 is attached to the supply reel 3. By engaging with one of the formed convex portions 15, the interlocking plate 5 and the supply reel 3 cannot rotate relative to each other. The opening 14 of the case 1 is closed by the slide shutter 14 ₁ when the adjustment button 6 is moved to the inner surface of the upper case so that the rotating operation of the interlocking plate 5 is not hindered. When the adjusting button 6 is in the first position inside the opening 14 formed in the case 1, the magnetic tape can be freely reciprocated between the supply reel 3 and the take-up reel 4.

For example, when it is desired to repeat the reproduction only within a specific range of the entire length of the already recorded magnetic tape 2, the tape length adjusting device is operated at the last magnetic tape position to be reproduced. First, the tape cassette is loaded into the tape recorder and a reproducing operation is performed. When the end of the reproduction target range is reached, the tape running is stopped. The cassette tape is taken out from the tape recorder, the adjusting button 6 is pushed in to the second position, and the opening 14 is closed by the slide shutter 14 ₁ . Then, the tape cassette is reloaded into the tape recorder. Operate the tape recorder and play or fast-forward the tape cassette to run it in the same direction as it was before removal. The supply reel 3 starts to rotate counterclockwise under the rotational force from the tape recorder, but the convex portion 15 of the supply reel 3 adjacent to the adjusting button 6 immediately engages with the cam portion 6 ₃ of the adjusting button 6. The supply reel 3 and the interlocking plate 5 rotate integrally, and the control pin 7 increases the tension acting on the tape 2 to stop the tape running. (Fig. 5A)

When the tape 2 is rewound from the take-up reel 4 toward the supply reel 3 in this state, the adjustment button 6 is at the second position where it is pushed in, so that the supply reel 3 and the interlocking plate 5 are integrated. And rotate clockwise. When the supply reel 3 makes almost one rotation, the end of the control pin 7 comes into contact with the inner surface of the portion of the tape 2 extending in the tangential direction, and when the supply reel 3 and the interlocking plate 5 further rotate, the control pin 3 is moved to 7 swings counterclockwise around the shaft hole, and the end of the control pin 7 is sandwiched between the tapes 2. Then, with the end of the control pin 7 sandwiched between the tapes 2, the tape 2 can be continuously wound on the supply reel 3 as it is. When the rewound tape 2 is made to travel in the direction from the supply reel 3 to the take-up reel 4 by reproduction or fast-forwarding, the control pin 7 comes to a position in the longitudinal direction of the set tape with the stop position first. Immediately before, the end of the control pin 7 comes out above the tape 7, and when it reaches the set position, the control pin 7 engages with the tangential portion of the tape 2 and acts on the tape 2 as described above. The tension increases, and the running of the tape 2 is stopped again.

[0012] It should be noted that, once, or to change the stop position delivery was set, in the case or to release the set, a tape cassette that was stopped at the stop position feed is fetched from a tape recorder, a slide shutter 14 ₁ by hand If the adjusting button 6 is moved to open the opening 14 and the supply reel 3 is slightly rotated to align the adjusting button 6 with the opening 14 of the case 1, the adjusting button 6 may enter the opening 14 and return to the first position.

[0013]

[Effect of the device]

 The present invention relates to a magnetic tape cassette in which a magnetic tape is wound and stored in a pair of rotatable reels in a cassette case, and the reel is provided with an interlocking plate having an adjusting button for stopping tape feeding and a control pin. By providing the reel with a locking part that rotatably fits the interlocking plate, it is possible to easily incorporate a magnetic tape cassette with adjustable recording / playback time in an automated assembly line for mass production. In addition, the workability is significantly improved, and there are practical effects such as increased production efficiency and cost reduction due to reduction of the number of parts.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, excluding an upper case.

FIG. 2 is an enlarged vertical sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of the interlocking plate of the embodiment of FIG. 1 viewed from above.

FIG. 4 is an enlarged vertical sectional view taken along the line BB in FIG.

FIG. 5 is an enlarged plan view of the reel unit showing an operating state of the embodiment, in which A is a state in which the control pin is engaged with the tape, and B is an explanatory diagram in which the control pin is wound around the tape.

FIG. 6 is a plan view of the embodiment.

7 is an enlarged vertical cross-sectional view taken along the line CC of FIG. 6, where A shows a state in which the interlocking plate is locked to the upper case, and B shows
Shows the state where the interlocking plate is locked to the supply reel.

[Explanation of symbols]

1 Case 2 Magnetic tape 3 Supply reel 3 ₁ Cylindrical part 4 Take-up reel 5 Interlocking plate 5 ₁ Cylindrical wall 5 ₂ Annular flange part 5 ₃ Annular flange part 6 Adjustment button 6 ₁ Elastic support part 6 ₂ Projection part 6 ₃ Cam part 7 Control pin 9 Locking part 13 Recess 14 Opening 14 ₁ Sliding shutter 15 Convex part

Claims (3)

[Scope of utility model registration request] 1. A magnetic tape 2 is accommodated in a cassette case 1 by being wound around a rotatable supply reel 3 and a take-up reel 4, and the supply reel 3 is provided with an adjusting button 6 for stopping tape feeding and a control pin. 7. A magnetic tape cassette provided with an interlocking plate 5 having an interlocking plate 5 and a locking part 9 for rotatably fitting the interlocking plate 5 on the supply reel 3. 2. The engagement portion 9 is an undercut claw protrudingly provided on the outer periphery of the inner cylindrical portion 3 ₁ of the supply reel 3 and is formed at the lower edge of the cylindrical wall 5 ₁ of the interlocking plate 5. The magnetic tape cassette according to claim 1, wherein the magnetic tape cassette is locked to the annular flange portion 5 ₃ . 3. The interlocking plate 5 has an annular flange portion 5 ₂ protruding outward at the upper edge of the cylindrical wall 5 ₁ and an annular flange portion 5 ₃ protruding inward at the lower edge. The magnetic tape cassette according to claim 1, which is made of a synthetic resin material.