JPH0611183U - Magnetic tape cassette - Google Patents

Abstract

(57) [Summary] [Purpose] Control pins used for magnetic tape cassettes that allow adjustment of recording / playback time enable smooth and safe running control without causing tape damage, and stop adjustment buttons for operation. Make the position constant. A reel in a cassette case is provided with an interlocking plate 5 having a control pin 7 for stopping tape feeding, and a pin guide member 17 rotatably provided on the case 1 by the control pin 7.
In the magnetic tape cassette configured to stop the tape feeding via the tape, the rotation restricting rib 9 for stopping the rotation of the control pin 7 is provided on the inner surface of the case, so that the tape running can be performed at the set position where the time is adjusted. When stopping, there is no collision between the control pin and the magnetic surface of the tape, so there is no damage to the tape, it can be operated safely, and the reliability is high. It does not change, always stops at the same position, does not require a positioning operation, and the opening formed in the case can be made small to improve the strength and appearance of the case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape cassette provided with a control pin capable of adjusting a recording / reproducing time of a tape in a tape cassette in which magnetic tapes such as audio are wound and housed.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 6, the present invention has been previously proposed by the present applicant (actual application No. 2-72496) as a tape cassette itself capable of freely adjusting the recording / reproducing time. An interlocking plate e having an adjustment button c and a tape control pin d is rotatably fitted in the recess of the supply button, and the adjustment button c is engaged with and disengaged from the connecting projection provided in the recess, and the supply reel b There is a tape cassette in which the and the interlocking plate e can be integrally rotated or can be relatively rotated, and the feeding of the tape is stopped at a predetermined position by the control pin d.

[0003]

[Problems to be solved by the device]

 However, if the control pin d is used to stop the feeding of the tape at an arbitrary position in the length direction of the tape a, when the tape is played back to the time adjustment position and the tape is fed by fast-forwarding, the control pin applies tension to the tape. As a result, the control pin directly collides with the magnetic surface of the tape, causing large damage to the tape and causing dropouts. , If the tape feeding is stopped via the pin guide member so that it does not come into direct contact with the tape, that is, if the tape is stopped when the control pin moves onto the pin guide member, the tape winding diameter The position of the control pin is different due to the difference in the position, and the stop position of the adjustment button c for operating the control pin is different, and the entire movement range is covered. The size of the opening must be provided in case that, even there is such a problem to decrease only if an unsightly commercial value becomes casing strength degradation. The present invention seeks to eliminate these drawbacks appropriately, and a control pin for stopping the tape feeding applies a direct tension to the tape in order to make a magnetic tape cassette capable of adjusting the recording / playback time. Instead, the reel rotation can be safely stopped, the position of the adjustment button does not change even if the tape winding diameter changes, it always stops at the same position, and the opening formed in the case does not require any alignment operation. It is an object of the present invention to provide a magnetic tape cassette which is small in size, has good strength and good appearance in a comb case, and has a high durability and an inexpensive form.

[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 an interlocking plate 5 is rotatably provided on the supply reel 3 and supplied. An adjustment button 6 for engaging and disengaging the reel 3 and the interlocking plate 5, and a control pin 7 for stopping the tape feeding are provided on the interlocking plate 5, and the pin guide rotatably provided on the case 1 by the control pin 7. A magnetic tape cassette configured to stop the tape feeding through a member 17, wherein a rotation regulating rib 9 for stopping the rotation of the control pin 7 is provided on the inner surface of the case. is there.

[0005]

[Action]

The interlocking plate 5 in the recess 13 of the supply reel 3 is rotatably fitted in the locking portion 11 so as not to be pulled out in the axial direction, and the adjustment button 6 has an opening 14 formed in the case 1. When it is in the first position (locked off), the interlocking plate 5 is separated from the supply reel 3 and is stationary, and the free end 7 ₂ of the control pin 7 is the magnetic tape 2. Is located radially outwardly of the pin guide member 17 and between the pin guide member 17 and the tangentially extending portion of the tape 2, while the supply reel 3 is free to rotate. 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. Further, when the adjustment button 6 is pushed in by closing the opening 14 with the slide shutter 14 ₁ and brought to the second position (lock ON) in which the adjustment button 6 is slid over the inner surface of the upper case, the supply reel 3 engages with the convex portion 15 and is supplied. The reel 3 and the interlocking plate 5 rotate integrally, and at the same time as the interlocking plate 5 rotates, the control pin 7 also rotates. Originally, the control pin 7 was located between the pin guide member and the portion extending in the tangential direction of the tape 2 when the lock was turned off. Therefore, if the interlocking plate 5 rotates as it is, the interlocking plate 5 the free end 7 ₂ of the control pin 7 which is pivotally supported is engaged with the pin guide member 17, and stops further hit the rotation restricting ribs 9, stopping the rotation of the supply reel 3, whereby Te Purekoda A tension detection mechanism (not shown) is activated to stop the tape 2 from running, and the tape can be stably switched without rubbing.

[0006]

【Example】

 1 to 5, 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 of both ends fixed respectively. The magnetic tape 2 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. 13 are 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 rotatably fitted in the recess 13 of the supply reel 3 by a locking portion 11 of a ring or a claw. The interlocking plate 5 is made of a synthetic resin material and has a donut shape having an annular flange portion projecting outward at the upper edge of the cylindrical wall and an annular flange portion projecting inward at the lower edge. , control pin 7 on the upper surface outer peripheral portion of the annular flange portion is provided rotatably, adjustment button 6 via the bus Ne ₆₁ support the outer peripheral portion thereof diametrically opposite the metal spring such as It is made of flexible material.

The control pin 7 has a mounting base 7 ₁ rotatably supported by a cylindrical rib protruding from an interlocking plate 5 parallel to the rotation axis of the supply reel 3, and further parallel to the shaft hole. It is composed of a free end portion 7 ₂ along the peripheral surface of the winding tape extending downward. Then, the control pin 7 can be pivoted about the mounting base 7 ₁ and its free end 7 ₂ can contact the surface of the magnetic tape 2 or the pin guide member 17. The control pin 7 is preferably made of a non-magnetic metal material, the free end portion 7 ₂ at the tip has a circular cross section, and the mounting base portion 7 ₁ is provided with a cylindrical rib projecting from the interlocking plate 5. Mating holes are provided and attached by caulking the cylindrical ribs. The control pin 7 is rotatably fixed on the welded portion 8 of the mounting base 7 ₁ . With this control pin 7, the tape feeding is stopped via a pin guide member 17 rotatably provided on the case 1, and a rotation control rib 9 for stopping the rotation of the control pin 7 is provided on the inner surface of the case. The control pin 7 is forcibly stopped, so that the stop position of the adjusting button 6 can always be kept constant regardless of the tape winding diameter.

In this case, the rotation control rib 9 is provided between the tape guide pin 10 protruding from the case 1 and the support shaft 17 ₁ of the pin guide member 17, and the control pin 7 can be freely rotated. it becomes a standing wall for supporting the end portion 7 ₂ may be in a different individual, even together with the tape guide pins 10 are extended to close the position of the guide roller 12 to be mounted to the case.

In addition, when tension is applied to the magnetic tape 2, a pin having a tape contact end is provided so that the tip is always in contact with both the tape magnetic surface side and the tape back surface side of the magnetic tape 2. A guide member 17 is rotatably provided on the case by a support shaft 17 _1. The control pin guide member 17 is a lever having a bent end in an arc shape. It is rounded into a rounded shape, but the radius of the tape contact end is made smaller than the radius of the free end portion 7 ₂ at the tip of the control pin 7 so that the control pin 7 goes into the inside of the pin guide member 17. It is preferable that the pin guide member 17 is a strip-shaped strip having a tape width and is subjected to an antistatic treatment because the pin guide member 17 is in contact with the magnetic tape 2. Is good Arbitrariness. It is also a preferable mode to consider the fact that the pin guide member 17 is biased in the axial direction of the reel hub by a spring (not shown).

As the locking portion of the interlocking plate 5, the locking portion 11 is fitted and used, but a ring protruding from the outer periphery of the drum inner cylindrical portion 3 ₁ of the supply reel 3 or An undercut claw may be used, which is locked to an annular flange portion formed on the lower edge of the cylindrical wall of the interlocking plate 5, and the interlocking plate 5 is rotatably fitted in the recess 13 and is removed. It has a structure that prevents it from coming out.

The center plate of the interlocking plate 5 housed in the recess 13 of the supply reel 3 is loosely fitted into the inner cylindrical portion 3 ₁ formed in the supply reel 3, and the cylindrical portion 3 _It is positioned in the up-and-down direction by the locking portion 11 projecting from _{1 so} that it can rotate stably. When the adjustment button 6 is in the first position (lock OFF), that is, when it is fitted in the opening 14 formed in the case 1, the interlocking plate 5 engages with the convex portion 15 formed on the supply reel 3. Relative rotation about the rotation axis is possible with respect to the supply reel 3 without matching, and the control pin 7 is located between the control pin guide member 17 and the portion extending in the tangential direction of the tape 2. The tape is in the free position and tension is not applied to the tape.

Further, when the adjustment button 6 is pushed downward to the second position (lock ON), that is, when the adjustment button 6 also digs into the inner surface of the case 1, the adjustment button 6 provided on the interlocking plate 5 is moved. The bottom surface engages with one of the protrusions 15 formed on the supply reel 3, and the relative rotation between the interlocking plate 5 and the supply reel 3 becomes impossible. It should be noted that when the adjustment button 6 is moved to the inner surface of the upper case, the opening 14 of the case ₁ is closed by the slide shutter 14 _{1 so} that the rotating operation of the interlocking plate 5 is not hindered. Is hooked on the pin guide member 17 and displaced immediately before and immediately after the supply reel 3 is stopped, and is locked by the pin guide member 17 to tension the tape. 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 within a specific range of the entire length of the magnetic tape 2 which has already been recorded, 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 the reproduction 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 shutter 14 ₁ closes the opening 14 to push the adjustment button 6 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 it was before removal. The supply reel 3 starts to rotate counterclockwise in response to the rotational force from the tape recorder, but the convex portion 15 of the supply reel 3 adjacent to the adjustment button 6 immediately engages with the adjustment button 6 to cause the supply reel 3 to rotate. 3 and the interlocking plate 5 rotate as a unit, the control pin 7 is hooked on the pin guide member 17 and moves, and at the same time, engages with the pin guide member 17 and hits the rotation restricting rib 9 to stop. As a result, the tension acting on the tape 2 is increased and the tape running is stopped.

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 in which the adjustment button 6 is pushed, so that the supply reel 3 and the interlocking plate 5 are integrated. And rotate clockwise. The free end portion 7 ₂ of the control pin 7 is guided by the pin guide member 17 and 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 rotate, the control pin 7 With the mounting base portion 7 ₁ as a center, the tape 2 can be continuously wound around the supply reel 3 while rotating in a counterclockwise direction and sandwiching the free end portion 7 ₂ with the tape. 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 is set at the stop position in the longitudinal direction of the set tape. Immediately before, the free end 7 ₂ of the control pin 7 is guided to the pin pattern guide member 17, the pin guide member 17, to the extension building parts in the tangential direction of the tape 2, coming out sandwiched by positions When the set position is reached, the free end 7 ₂ of the control pin 7 engages with the pin guide member 17 and stops against the rotation restricting rib 9, so that the tension acting on the tape 2 is reduced. As a result, the tape 2 will stop running again.

[0016] Incidentally, once to change the stop position feeding set, when or to cancel the setting, the tape cassette is stopped at the stop position feed is fetched from the tape recorder, the slide shutter 14 ₁ by hand When the opening is moved and the opening 14 is opened, the adjustment button 6 is always located at the position of the opening 14 regardless of the tape winding diameter, so that the adjustment button 6 enters the opening 14 and returns to the first position (lock OFF).

[0017]

[Effect of device]

 According to the present invention, a magnetic tape is wound around a pair of rotatable reels and housed in a cassette case, an interlocking plate is rotatably provided on the reel, and an adjusting button for engaging and disengaging the supply reel and the interlocking plate. And a control pin for stopping the tape feeding on the interlocking plate, and the tape feeding is stopped by the control pin via a pin guide member rotatably provided on the case 1. By providing a rotation restricting rib for stopping the rotation of the control pin on the inner surface of the case, the control pin engages with the tangential portion of the tape when the tape running stops at the time-adjusted set position. Instead of stopping, the pin guide member is placed in front of the tape guide member and the portion extending in the tangential direction of the tape and guided to the position, and further engaged with the control pin guide member. Since the rotation of the supply side reel is stopped, the magnetic surface of the tape does not collide with the control pin, and the tape can be operated safely without damage to the tape, resulting in high reliability. The position of the adjustment button does not change even if it changes, and it always stops at the same position, does not require alignment operation, and the opening formed in the case is small to improve the strength and appearance of the case for recording and playback. There is also a practical effect in that a time-adjustable magnetic tape cassette can be easily incorporated into an automatic assembly line for mass production, which also helps improve workability.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention with a part of an upper case removed.

FIG. 2 is a plan view of the embodiment of FIG. 1 excluding an upper case, showing a winding start state of a take-up reel.

FIG. 3 is an enlarged vertical sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of the interlocking plate of the embodiment as seen from above.

5 is an enlarged cross-sectional view of a portion of FIG.

FIG. 6 is a plan view excluding an upper case of a conventional example.

[Explanation of symbols]

1 Case 2 Magnetic Tape 3 Supply Reel 3 ₁ Inner Cylindrical Part 4 Take-up Reel 5 Interlocking Plate 6 Adjustment Button 7 Control Pin 7 ₁ Mounting Base 7 ₂ Free End 8 Welding Part 9 Rotation Restriction Rib 10 Tape Guide Pin 11 Locking Part 12 Guide roll 13 Recess 14 Opening 14 ₁ Slide shutter 15 Convex part 17 Control pin guide member 17 ₁ Spindle

Claims (3)

[Scope of utility model registration request] 1. A magnetic tape 2 in a cassette case 1,
An adjusting button 6 which is wound around a rotatable supply reel 3 and a take-up reel 4 and accommodated therein, rotatably provided with an interlocking plate 5 on the supply reel 3, and which disengages the supply reel 3 and the interlocking plate 5. And a control pin 7 for stopping the tape feeding, which is provided on the interlocking plate 5, and the tape feeding is stopped by the control pin 7 via a pin guide member 17 rotatably provided on the case 1. In the cassette, a rotation restricting rib 9 for stopping the rotation of the control pin 7 is provided on the inner surface of the case. 2. The rotation control rib 9 is provided between a tape guide pin 10 protruding from the case 1 and a support shaft 17 ₁ of the pin guide member 17, and a free end portion of the control pin 7 is provided. The magnetic tape cassette according to claim _2, which supports 72. 3. The magnetic tape cassette according to claim 1, wherein the rotation restricting rib 9 extends to a position near a guide roller 12 mounted on the case.