JPH0611179U - Magnetic tape cassette - Google Patents

Abstract

(57) [Abstract] [Purpose] To facilitate the dimensional accuracy control in the automatic assembly line of the magnetic tape cassette that can adjust the recording / playback time, and to enable the automatic assembly to improve workability. [Structure] A magnetic tape 2 is wound and housed in a cassette case 1 on a pair of rotatable reels 3 and 4, and an interlocking plate 5 is rotatably fitted to the reel 3 and is attached to the interlocking plate 5. In a magnetic tape cassette provided with an adjusting button 6 for engaging and disengaging the supply reel 3 and the interlocking plate 5, and a control pin 7 for stopping the tape feeding, a spring portion integrally formed with the adjusting button 6 is welded to the interlocking plate 5. Since it is fixed at the part, it can be easily assembled in an automatic assembly line to make a magnetic tape cassette that can adjust the recording and playback time, the dimensional accuracy control is easy, and the reliability and production efficiency are high. With significant improvements,
The cost can be reduced by reducing the number of parts and it can withstand long-term use.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 In the conventional tape cassette itself, which can freely adjust the recording / reproducing time, the one previously proposed by the present applicant (Japanese Patent Application No. 2-72496) is provided with an adjusting button and a tape in the recess of the take-up reel of the tape. An interlocking plate having a control pin is loosely fitted, and the adjusting button is engaged with and disengaged from the connecting convex portion provided in the recess so that the take-up reel and the interlocking plate can be integrally rotated or relatively rotated, There is a tape cassette that stops the delivery of the tape in place.

[0003]

[Problems to be solved by the device]

 However, if the adjustment button of the interlocking plate that engages and disengages with the reel to stop the tape feeding at any position in the length direction of the tape becomes a separate member structure attached via a spring, the interlocking plate and spring And it is complicated to assemble each member of the adjustment button as an individual part, and it is technically difficult to incorporate it in an automatic assembly line for mass production. Especially, if the adjustment button and the spring are separate members, dimensional accuracy control during assembly is possible. However, it is difficult to perform production and processing, the production cost is relatively high, the cost performance is poor due to the large number of parts, and the production efficiency cannot be increased. On the other hand, it is conceivable to integrally form each member with plastic, but this is not practical due to the drawbacks such as the spring part not being able to withstand long-term use and malfunctions due to temperature changes. There is also. The present invention is intended to eliminate these drawbacks properly, and can be easily incorporated in an automatic assembly line to make a magnetic tape cassette capable of adjusting the recording / playback time, and the dimensional accuracy can be controlled. It is also an object of the present invention to provide a magnetic tape cassette of a simple and inexpensive structure that can be easily manufactured, greatly improve the production efficiency, reduce the cost by reducing the number of parts, and can withstand long-term use.

[0004]

[Means for Solving the Problems]

According to the present invention, a magnetic tape 2 is wound around a pair of rotatable reels 3 and 4 in a cassette case 1 and housed therein, and the magnetic tape 2 is paired into a rotatable reel 3 and 4 inside the cassette case 1. The reel 3 has the interlocking plate 5 rotatably fitted therein, and the interlocking plate 5 has an adjusting button 6 for engaging and disengaging the supply reel 3 and the interlocking plate 5, and a tape feed stop. In a magnetic tape cassette provided with a control pin 7 for use with, a spring portion 6 ₁ integrally formed with an adjusting button 6 on the interlocking plate 5 is fixed by a welding portion 8.

[0005]

[Action]

Control button 6, when in the first position that is fitted into the opening 14 formed in the casing 1 by the spring portion 6 _1, interlock plate 5 have been separated from the supply reel 3, is in the stationary state The end of the control pin 7 is located radially outward of the magnetic tape 2, while the supply reel 3 can rotate freely. In this state, the magnetic tape 2 can freely reciprocate 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 by closing the opening 14 with the slide shutter 14 ₁ and moved to the second position in which the adjustment button 6 is slid over the inner surface of the upper case, the adjustment button 6 engages with the convex portion 15 of the supply reel 3. The supply reel 3 and the interlocking plate 5 rotate integrally. 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 located at a position apart from the outermost peripheral portion of the tape 2 wound around the supply reel 3 is also directly attached to the tape. In the case of the tensioning method, it rotates counterclockwise. When the end of the control pin 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 moves to the interlocking plate 5. Move with them. Therefore, the tangentially extending portion of the tape 2 is pulled in the rotation direction of the supply reel 3 by the end portion of the control pin 7 or the pin guide member 17, so that the tension acting on the tape 2 increases and the tension of the tape recorder increases. A detection mechanism (not shown) is activated to stop the tape 2 from running. Further, in the case where the tension is not applied directly to the tape, when the interlocking plate 5 rotates, the free end of the control pin 7 axially supported by the interlocking plate 5 engages with the pin guide member 17 to supply the reel. The rotation of the tape 3 is stopped, whereby the tension detecting mechanism of the tape recorder is activated and the running of the tape 2 is stopped.

[0006]

【Example】

 1 to 6, the tape cassette comprises a cassette case 1, a pair of reels 3 and 4 and a magnetic tape 2 which are rotatably housed in the cassette case 1, respectively. ing. 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 each have a predetermined length with one of both ends fixed. The magnetic tape 2 of is wound. The supply reel 3 is integrally formed with a projection extending radially inward at the center of the supply reel 3 to receive rotation from the tape recorder, and a recess 13 is formed inside the winding drum portion of the reel 3. Has been formed. The cylindrical inner wall defining the recess 13 is provided with a plurality of locking projections 15 projecting radially inward at equal intervals.

An annular interlocking plate 5 is loosely fitted in the recess 13 of the supply reel 3. The interlocking plate 5 is formed of a cylindrical body, and is a donut shape in which annular flanges 5 ₁ and 5 ₂ are provided on the inner periphery of the lower end and the outer periphery of the upper end so as to project. 7 is provided, and spring members 6 ₁ and 6 ₁ are fixed to the notched end of the flange portion 5 ₂ on the diametrically opposite side by a welded portion 8. The spring portion 6 ₁ is bent and integrally adjusted. Button 6 is formed. In this case, as the adjusting button 6, a cam portion for locking is formed on the bottom surface so that it can come into contact with the convex portion 15 of the concave portion 13. That is, control button 6 is front Symbol spring portion ₆₁ is constituted by a strip-shaped metal plate spring member, provided with a control button 6 was bent upright in the central portion, and an elastic support piece 6 ₂ comprising a cam portion The suspension parts 6 ₁ and 6 ₁ are connected to the flange part 5 ₂ of the interlocking plate 5 by using a suspended _one , and the protrusions are provided on the upper surface of the interlocking plate 5, but the adjustment button 6 is interlocked. It is preferable that the adjusting button 6 is effectively provided with a spring action by rising from the upper surface of the plate 5 and bendingly protruding in the outer peripheral direction.

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. The control pin 7 is swiveled around the shaft hole so that its end can contact the surface of the magnetic tape 2, or is supported by a pin guide member 17 rotatably provided on the case. Then, the tape feeding may be stopped so as not to directly collide with the tape.

The interlocking plate 5 housed in the recess 13 of the supply reel 3 has its center hole loosely fitted in the inner cylindrical wall formed in the supply reel 3, and the fitting part in the cylindrical wall. It is positioned in the up-down direction by such things as stable rotation. 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 on the supply reel 3. Relative rotation around the rotation axis of the reel 3 is possible. When control button 6 is turned and a second position pushed downward i.e., when it slipped to the inner surface of the case 1, the elastic support piece 6 ₂ supply reel 3 of the adjusting button 6 provided on the interlock plate 5 By engaging with one of the convex portions 15 formed on the above, the relative rotation of the interlocking plate 5 and the supply reel 3 becomes impossible. Since the opening 14 of the case 1 is closed by the slide shutter 14 ₁ so that the adjustment button 6 is also moved to the inner surface of the upper case, the rotation 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 position of the last magnetic tape 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, and the opening 14 is closed by the slide shutter 14 ₁ so that the adjustment button 6 is pushed in to the second position. 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 before removal. Receiving a rotational force from the tape precoder, supply reel 3 begin to rotate in the counterclockwise direction, the elastic supporting piece 6 ₂ to engage immediately control button 6 protruding portion 15 of the supply reel 3 adjacent to the control button 6 As a result, the supply reel 3 and the interlocking plate 5 rotate together, 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 in the second position where the adjustment button 6 is pushed, 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 rotated as shown in FIG. 5B. 7 swings counterclockwise around the shaft hole so that 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 lengthwise 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 direction part 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 adjustment button 6 is moved to open the opening 14 and the supply reel 3 is slightly rotated to align the adjustment button 6 with the opening 14 of the case 1, the adjustment button 6 can be returned to the first position by entering the opening 14.

[0013]

[Effect of device]

The present invention relates to a magnetic tape cassette in which a magnetic tape is wound around a pair of rotatable reels and housed in a cassette case, and the reel is provided with an interlocking plate having an adjusting button and a control pin for stopping tape feeding. A magnetic tape 2 is wound around a pair of rotatable reels 3 and 4 and housed in a cassette case 1. An interlocking plate 5 is rotatably fitted on the reel 3 and is supplied to the interlocking plate 5. In a magnetic tape cassette provided with an adjustment button 6 for engaging and disengaging the interlocking plate 3 with the interlocking plate 5, and a control pin 7 for stopping tape feeding, the spring portion 6 _{1 in} which the adjustment button 6 is integrally formed on the interlocking plate 5 Since the tape is fixed at the welding part 8, it is possible to easily install a magnetic tape cassette with adjustable recording / playback time in a mass-production type automatic assembly line, and easy dimensional accuracy control and reliability. High, It duck workability can cost due to significantly reduce the increased production efficiency up and parts, without Stari spring has a practical effect of such withstand long-term use.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view of the interlocking plate of FIG. 1 in a separated state.

FIG. 4 is a perspective view of the interlocking plate of FIG. 3 in an assembled state.

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.

[Explanation of symbols]

1 case 2 magnetic tape 3 supply reel 4 take-up reel 5 interlocking plate 5 ₁ flange part 5 ₂ flange part 6 adjustment button 6 ₁ spring part 6 ₂ elastic support piece 7 control pin 8 welding part 13 recess 14 opening 14 ₁ slide shutter 15 convex

Claims (3)

[Scope of utility model registration request] 1. A magnetic tape 2 is wound and housed in a cassette case 1 on a pair of rotatable reels 3 and 4, and an interlocking plate 5 is rotatably fitted to the reel 3 and the interlocking plate is attached. 5, an adjustment button 6 for engaging and disengaging the supply reel 3 and the interlocking plate 5,
In a magnetic tape cassette and a control pin 7 for the tape-feeding stops, magnetic tape cassettes, characterized in that the spring portion ₆₁ which is integrally formed adjustment button 6 on the interlock plate 5 are fixed by welding portions 8 . 2. The spring part 6 ₁ is made of a strip-shaped metal plate spring material, is provided with an adjusting button 6 which is bent and erected at the center, and an elastic supporting piece 6 ₂ is hung. The magnetic tape cassette described. 3. The interlocking plate 5 is made of a cylindrical body and has flange portions 5 ₁ and 5 ₂ respectively projectingly provided on an inner periphery of a lower end and an outer periphery of an upper end, and the spring portion is formed at a notched end of the flange portion 5 _2. 6
3. The magnetic tape cassette according to claim ₁ , wherein ₁ and 61 are welded and connected.