JPH071564B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tape in which when a tape is loosened in a tape cassette, the tape is first loosened and then a reproducing operation is started. Regarding recorder.

(Problems to be Solved by the Related Art and Invention) If the tape cassette is not used, the magnetic tape in the cassette may be loosened due to external vibration or the like.
If such a cassette tape is loaded into the tape recorder as it is and the reproducing operation is started, the loose tape may be wound around the capstan or the pinch roller, and the tape or the tape recorder may be damaged.

For example, in a car stereo tape recorder, it becomes extremely difficult to take out the cassette when such a situation occurs, so the above problem is particularly serious.

As a countermeasure against this, even from the fact that many applications have been filed in the past, it is clear how a person skilled in the art seriously tackles this problem.

For example, Japanese Patent Publication No. 50-9408, Japanese Patent Publication No. 50-9409, Japanese Patent Publication No. 50-13652, Japanese Patent Publication No. 51-88007, No. 50-104, Actual No. 50-15470, No. 50-27301, No. No. 52-48727 No. 52-56804 No. 49-86821 No. 49-86821 No. 49-102709 No. 50-81808 No. 50-105407 No. 50-105408 No. No. 50-144607 No. No. 50-149010 No. No. 50-149011 No. 58-43655 No. 58-43656 No. 58-43657 No. 51-3311 No. 51331 No. 52-35207, No. 53-52114, No. 53-1311, etc. are all about measures against this problem.

However, these conventional techniques try to prevent the loose tape from getting in between the pinch roller and the capstan by improving the mechanism around the pinch roller and the capstan, or the tape is pinched. When it was wrapped around a roller or capstan, it tried to detect this quickly.

The former one has a drawback that it cannot reliably prevent the tape from getting in between the pinch roller and the capstan, and the latter one only knows the fact that the tape is wound around the pinch roller and the capstan, and it is the root cause. It could not be said that it was an effective measure. In addition, neither of them is to eliminate the slack of the tape, so if the tape is slack or the tape is wound around the pinch roller or capstan, you must immediately stop the operation to correct the situation. It was troublesome.

An object of the present invention is to provide a tape recorder in which when a tape is loose, the playback operation is not immediately started even if a playback operation is performed, and the playback operation is automatically started after the tape is loosened. To provide.

MEANS FOR SOLVING THE PROBLEM The present invention starts rotation of a motor which is started by loading a tape cassette on the first and second reel receivers and is stopped by ejecting the tape cassette. A tape recorder which transmits to one side to perform a reproduction operation, in particular, a braking means for prohibiting rotation of a second reel receiver and a rotation transmission means for a reproducing operation, and a rotational force of a motor to the first reel receiver. A rotation transmission body that constitutes a rotation path for eliminating tape slack that is transmitted, and a rotation transmission body that supports the rotation transmission body and positions the rotation transmission body at a predetermined position when the tape cassette is ejected to form the rotation transmission path for eliminating the tape slack. And a support body that separates the rotation transmission body from the predetermined position to block the rotation transmission path. The tension state of the tape is detected by the detection means for detecting the tension state of the tape between the first and second reel receivers from the rotation state of the first reel receiver when the first reel receiver is rotationally driven through At this time, the support is moved from a predetermined position by the slack eliminating means to block the tape slack eliminating rotation transmission path, and the prohibition of rotation of the second reel receiver by the braking means is released. It is characterized by.

Further, the present invention further comprises a pinch roller crimping prohibiting means for prohibiting crimping of the pinch roller to the capstan at the time of loading the tape cassette, and the pinch roller when the tension state of the tape between the first and second reel receivers is detected. It is characterized by removing the prohibition of crimping.

The means for crimping the pinch roller to the capstan is
When it is provided on the head mounting plate that is moved forward during the reproducing operation, it is preferable that the prohibition of the pinch roller from being pressed is realized as a means that prohibits the forward movement of the head mounting plate.

Further, the braking means is realized as a locking member provided with a brake piece that engages with an engaged portion provided on the second reel receiver and prohibits its rotation, and a stopper pin provided on this locking member. Is preferably engaged with the head mounting plate to form a pinch roller crimping prohibition means for prohibiting forward movement of the head mounting plate.

In this case, the head mounting plate has a locked portion that engages with the stopper pin of the locking member when in the retracted position and a forward movement of the stopper pin when the stopper pin is disengaged from the locked portion. It is preferable to provide an inclined portion that moves the stopper pin largely and positions the brake piece of the locking member at a position sufficiently separated from the engaged portion provided on the second reel receiver.

In addition, the locking member is provided with an engaging portion that engages with the support that supports the rotation transmitting body, and moves the support when the stopper pin is largely moved by the inclined portion of the head mounting plate. Then, the rotation transmission body is moved to a position where the rotation transmission path for eliminating tape slack is completely blocked.

On the other hand, the slack eliminating means is engaged with the engaging portion provided on the rotation transmitting body forming a part of the tape slack eliminating rotation transmitting path, and is engaged with the engaging portion to be displaced by the rotational force of the rotating body. A pressure-bonding prohibition releasing member, means for receiving the rotational force of the first reel receiver to avoid the engagement between the pressure-bonding prohibition releasing member and the engaging portion, specifically, an eccentric cam provided on the rotating body. , A rotation detecting piece that receives the rotational force of the first reel receiver and is rotationally displaced to cause the cam pin provided on the pressure-bonding inhibition releasing member to follow the eccentric cam and avoid the engagement between the cam pin and the engaging portion. It is characterized in that it is configured by.

Furthermore, the present invention provides the first aspect of the invention when the tape recorder is provided with an auto-reverse mechanism that reverses the reproduction direction of the tape.
The detecting means for detecting the tension state of the tape between the first and second reel receivers from the rotating state of the reel receiver of the second reel receiver operates even when the first reel receiver is rotationally driven through the rotation transmitting means for reproducing operation. By providing a changeover switch that is switched depending on the position of the support that supports the rotating body, the slack eliminating means is activated when the first reel receiver is rotationally driven through the rotating body, and the reproduction is performed. The automatic reverse mechanism is operated when the first reel receiver is rotationally driven via the operation rotation transmission means.

(Operation) According to the present invention, the second reel receiver is braked by the ejection of the tape cassette, and the rotation transmission path for transmitting the rotation of the motor to the first reel receiver by the rotation transmitter is the rotation for the reproduction operation. It is configured separately from the transmission means. Then, when the tape cassette is loaded and the motor is started, the first reel receiver rotates while the rotation of the second reel receiver is blocked. At this time, if the tape in the tape cassette is loose, The slack of the tape is wound around the first reel receiver.

However, when the tape is no longer slackened, the rotation of the second reel receiver is blocked, so that the tension of the tape between the first and second reel receivers blocks the rotation of the first reel receiver, and this state is detected. Detected by means. In response to this, the slack eliminating means moves the support member that supports the rotation transmitting member, interrupts the rotation transmitting path, and at the same time, prevents the second reel receiver from rotating. However, even if the rotation transmission path is cut off, since the rotation of the motor is transmitted to the first reel receiver through the rotation transmitting means for reproducing operation, the first reel receiver continues to rotate, Here, the tape is run from the second reel receiver to the first reel receiver and the reproducing operation is performed.

Therefore, when the tape cassette is loaded, the reproducing operation can be started immediately after the looseness of the tape is eliminated. Moreover, the reproduction operation can be promptly performed only by moving the rotation transmission body which is different from the rotation transmission means for the reproduction operation and which has released the brake applied to the second reel receiver and interrupts the rotation transmission path. It can be started.

Further, forward movement of the head mounting plate having means for crimping the pinch roller to the capstan is prevented, and the forward movement of the head mounting plate is blocked in conjunction with the interruption of the rotation transmission path. The forward movement of the head mounting plate causes the brake piece to be largely separated from the second reel receiver, and the rotation transmission body to be largely displaced from the position where the rotation transmission path is formed. Therefore, the shift to the reproducing operation after the slack of the tape is released Therefore, it is possible to reliably prevent the problem that the brake is erroneously applied to the second reel receiver during the reproducing operation.

(Embodiment) FIGS. 1 to 9 show a first embodiment of the present invention. When the cassette holder 1 moves from the cassette attaching / detaching position shown in FIG. 3 to the cassette loading position shown in FIG. The operation starts, and the tape drive motor 2 is activated. Further, by pushing the cassette eject operation means 3 shown in FIGS. 1 and 2 in the direction of → in the drawing, the cassette holder 1 is moved from the cassette loading position shown in FIG. 4 to the cassette loading / unloading position shown in FIG. You can

As shown in FIGS. 6 to 9, one reel receiver 4a
A detection means 5 for detecting the rotation state of the reel receiver 4a is provided on the side, and a brake means 6 having a braking function for the reel receiver 4b is provided on the other reel receiver 4b side.

Further, the head mounting plate 8 to which the magnetic head 7 is attached and which can freely move back and forth is always urged by a spring 9 in the forward direction (direction in which the magnetic head 7 is brought into contact with the tape T). A torsion spring 10 is attached to the head mounting plate 8 for a long time from side to side,
Connect both ends to the left and right pinch roller arms 11a,
It is engaged with the rotating end of 11b. A roller 12 is attached to the center of the torsion spring 10, and bending portions 13a and 13
b is formed, the roller 12 rolls along the rolling surface 14 provided on the head mounting plate 8, and the left and right bent portions 13a, 13b are formed.
Selectively contact the bending pieces 15a, 15b provided on the head mounting plate 8, and when the head mounting plate 8 advances, the pinch roller (16a or 16a or 16
b) is adapted to be crimped to the corresponding capstan (17a or 17b).

During the reproducing operation, the rotational force of the tape drive motor 2 is selectively transmitted to the left and right reel receivers 4a and 4b via the reproducing operation rotation transmitting means 18 (see FIG. 5). Reference numeral 19 in FIGS. 6 to 9 denotes a small gear which is a component of the rotation transmitting means. That is, the small gear 19
Is rotatably connected to the tape drive motor 2.

Further, the rotational force of the small gear 19 includes a tape slack eliminating rotation transmission means 20, a reel gear 21a and a friction transmission mechanism (not shown) which are provided separately from the reproduction operation rotation transmission means 18.
Is transmitted to one reel receiver 4a via. In the figure
21b is the other reel gear. The tape slack eliminating rotation transmission means 20 is composed of a cam gear 23 and a transmission gear 24 which are axially supported by a rotating plate 22 and mesh with each other, and an annular groove 25 is provided on the surface of the cam gear 23. The outer peripheral surface of the annular groove 25 is an eccentric cam surface 26, and the inner peripheral surface of the annular groove 25 is provided with an engagement step portion 27. Further, an engaging recess 28 is provided in a part of the rotating plate 22.

A locking member 29 is rotatably provided near the rotary plate 22, and one end 30 of the locking member 29 is extended into the engagement recess 28. Further, a crimping prohibition releasing member 31 is pivotally mounted near the one end 30, and a stopper pin 32 and a brake piece 33 are formed on the other end side of the locking member 29, respectively.
The locking member 29 is constantly urged in one direction by the spring 34.

The detection means 5 introduces the cam pin 35 provided in the pressure-bonding inhibition releasing member 31 into the annular groove 22, and one reel receiver 4a is squeezed with its lower outer periphery to detect the rotation detection piece 36.
And applies a rotational force in the counterclockwise direction in the drawing to the rotation detection piece 36 by the rotation force of the reel receiver 4a, and presses the pressure-bonding prohibition releasing member 31 in one direction at the tip of the rotation detection piece 36, The cam pin 35 is pressed against the eccentric cam surface 26. Then, when the rotation of the reel receiver 4a is stopped, the cam pin 35 is brought closer to the rotation track of the engagement step portion 27 at the shortest radius portion of the eccentric cam surface 26 and abuts on the engagement step portion 27. Then, the rotational force of the cam gear 23 causes the pressing inhibition releasing member 31 and the locking member 28.
Is pushed back against the spring 34.

The braking means 6 includes an engaged plate 37 provided coaxially with the other reel receiver 4b, and the brake piece engaged with the engaged plate 37.
It consists of 33 and.

The head mounting plate 8 is provided with a hole 38, and an engaged portion 39 and an inclined portion 40 are continuously formed at the edge of the hole 38. Then, the stopper pin 32 of the locking member 29 engages with the locked portion 39 to inhibit the head mounting plate 8 from moving forward, thereby preventing the pinch rollers 16a and 16b from moving toward the capstan 1 of the capstan 1.
Pinch roller crimping prohibition means to prohibit crimping to 7a, 17b 41
Are configured.

Therefore, when the cassette holder 1 is in the cassette loading / unloading position shown in FIG. 3, the tape cassette 42 in which the internal tape T is loosened is inserted therein, and the cassette holder 1 is moved to the cassette loading position shown in FIG. And a pair of reel hubs in the cassette 42 are loaded in the reel receivers 4a and 4b.

When the cassette holder 1 reaches the cassette loading position, the tape drive motor 2 is activated in connection with this, and its rotation is transmitted to the reel gear 21a via the small gear 19, the transmission gear 24 and the cam gear 23, and further, It is transmitted to the reel receiver 4a via a friction transmission mechanism (not shown). Then, the rotation detection piece 36 receives the rotational force of the reel receiver 4a and laterally presses the pressure-bonding inhibition releasing member 31 at its tip as shown in FIG. 6, and presses the cam pin 35 against the eccentric cam surface 26.

By rotating one reel receiver 4a in this manner, the loosened tape T in the cassette 42 is wound on one reel, while the other reel receiver 4b is rotated by the braking means 6. Is prohibited.

When the slack of the tape T in the cassette 42 is eliminated, the reel receiver 4a stops while causing slippage in the friction transmission mechanism between the reel gear 21a and the reel receiver 4a, so that the rotation detection piece 36 is pressed against the pressing inhibition releasing member 31. The pressing force disappears, and the cam pin 35 is brought closer to the rotation track of the engagement step portion 27 by the shortest radius portion of the eccentric cam surface 26 as shown in FIG.

Therefore, the rotational force of the cam gear 23 is transmitted to the crimping prohibition releasing member 31 via the engagement step portion 27 and the cam pin 35, and the crimping prohibition releasing member 31 and the locking member 29 resist the spring 34 as shown in FIG. Pushed back in the direction. The rotation of the locking member 29 at this time causes the stopper pin 32 to separate from the locked portion 39.

When the stopper pin 32 is disengaged from the locked portion 39, the head mounting plate 8 moves forward to the reproduction operation position by the elastic force of the spring 9 while pushing the stopper pin 32 away by the inclined portion 40. Then, the one end 30 of the engaging member 29 presses the edge of the engaging recess 28 to rotate the rotating plate 22, so that the cam gear 23 and the transmission gear 24 separate from the reel gear 21a and the small gear 19, respectively, and the tape The slack eliminating rotation transmission means 20 interrupts the rotation transmission path from the tape drive motor 2 to the reel receiver 4a.

Further, by moving the head mounting plate 8 forward to the reproducing operation position, the pinch roller arms 11a and 11b are rotated at both ends of the torsion spring 10. At this time, pinch roller 16
Although a and 16b approach the corresponding capstans 17a and 17b, respectively, since the bent portion 13a of the torsion spring 10 is out of the bent portion 15a, one of the pinch rollers 16a is placed in the capstan 1a.
7a and the other pinch roller 16b is capstan 1
Do not touch 7b.

Further, when the head mounting plate 8 moves to the reproduction operation position, the rotation transmission path of the reproduction operation rotation transmission means 18 is closed. That is, in addition to the small gear 19, the regeneration operation rotation transmission means 18 includes a pair of intermediate gears 43a, 43b meshing with each other as shown in FIG. 5, and an intermediate small gear 44a coaxial with and integral with the intermediate gears 43a, 43b. , 44b and a selection gear 45 and the like mounted on the head mounting plate 8 so as to be movable in the left and right directions.
The a is rotatably connected to the small gear 19. The position of the selection gear 45 is determined by the position of the tape running direction control plate 46.For example, when the tape running direction control plate 46 is in the right position, the selection gear 45 moves to the right intermediate small gear 44a and the right side. The rotary force of the motor 2 is transmitted to the right reel receiver 4a by meshing with the reel gear 21a. The torsion spring 10 also has one end fixed to the tape running direction control plate 46. For example, when the tape running direction control plate 46 is in the right position, the left bent portion 13b is the left bent piece 15b. The pinch roller 16a on the right side is pressed against the capstan 17a on the right side as the head mounting plate 8 moves forward.

Next, when the cassette 42 is taken out, the ejecting operation means 3 shown in FIGS. 1 and 2 may be pushed in the direction of → in the drawing. Then, the operating force is transmitted to the rotating piece 47 shown in FIG. 2, and the rotating piece 47 pushes the head mounting plate 8 back against the spring 9. Then, when the head mounting plate 8 is pushed back to the initial position, the stopper pin 32 re-engages the locked portion 39.
To inhibit forward movement of the head mounting plate 8, and at the same time, the brake piece 33 engages with the engaged plate 37 to inhibit rotation of the reel receiver 4b. Further, the rotary plate 22 is pushed back to the initial position by the one end 30 of the locking member 29 to close the rotation transmission path of the tape slack eliminating rotation transmission means 20. Thus, the tape slack eliminating rotation transmitting means 20 prepares for the tape slack eliminating operation before the start of the reproducing operation at the time of the next reproducing operation.

On the other hand, since the cassette holder 1 is moved from the cassette loading position to the cassette loading / unloading position by the eject operation, the cassette 42 can be taken out or replaced.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the figure, reference numeral 51 denotes a cam gear which is a main part of the tape slack eliminating rotation transmitting means, and a gear (not shown) having the same diameter as that of the cam gear is arranged below the cam gear. )
The cam gear 51 is the first
A gear provided under the cam gear 51 meshes with a small gear 19 similar to that of the embodiment, and meshes with a reel gear 21 to form a reel receiver 4a.
When is stopped, the lower gear is also stopped. An annular groove 52 is provided on the surface of the cam gear 51, and the inner peripheral surface of the annular groove 52 is an eccentric cam surface 53,
An engagement step portion 54 is provided on the outer peripheral surface of the annular groove 52.

A rotation detection piece 55 is provided coaxially with the cam gear 51. This is connected to the lower gear through another friction transmission mechanism (not shown), receives the rotational force of the lower gear and is urged in the clockwise direction in the figure, and receives the rotational force in the clockwise direction in the figure. Is pressed against the eccentric cam surface by pressing the press-fitting prohibition releasing member 31 from the side by the pressing pin 56 provided at the rotating end of the cam pin 35.
Press on 53.

The other structure is the same as that of the first embodiment, so the description thereof is omitted, but the operation is as follows.

When the tape cassette 42 in which the tape T is loose is loaded and the motor 2 is started, the small gear 19 is rotated, and the rotation is performed via the cam gear 51, a friction transmission mechanism (not shown), the lower gear and the reel gear 21. Receiving to receiver 4a. Then, the rotation detection piece 55 receives the rotation force of the lower gear and receives the cam pin.
Press 35 against eccentric cam surface 53.

Due to the rotation of the reel receiver 4a, the tape in the cassette 42 is
Only the amount of slack is taken up, while the other reel is received
The rotation of 4b is prohibited by the braking means 6.

When the tape in the cassette 42 is wound up by the looseness, the reel receiver 4a stops, so that the rotation detecting piece 55 brings the pressing force against the pressing inhibition releasing member 31 to the rotation track of the engaging stepped portion 54 by the diameter reducing portion. To be

Therefore, the rotational force of the cam gear 51 is transmitted to the crimping prohibition releasing member 31 via the engagement step portion 54 and the cam pin 35, and the crimping prohibition releasing member 31 and the locking member 29 are pushed back against the spring 34. Then, by rotating the locking member 29, the stopper pin 32
Is disengaged from the locked portion 39 and the brake piece 33 is engaged plate.
Move away from 37.

When the stopper pin 32 is disengaged from the locked portion 39, the head mounting plate 8 moves forward to the reproducing operation position while pushing the stopper pin 32 away from the inclined portion 40, and the engaging recess 28 at one end 30 of the locking member 29. The edge of is pressed to rotate the rotating plate 22. Therefore, the lower gear is separated from the reel gear 21, and the cam gear 51 is also separated from the small gear 19 by the tape slack eliminating rotation transmission means. The rotation transmission path from the tape drive motor 2 to the reel receiver 4a is cut off.

Other movements associated with the forward movement of the head mounting plate 8 are
It is similar to the embodiment.

When the cassette 42 is taken out, when the eject operation is performed, the head mounting plate 8 is pushed back to the initial position by the operation force. Then, the stopper pin 32 again engages with the locked portion 39 to inhibit forward movement of the head mounting plate 8, and at the same time, the brake piece 33 engages with the engaged plate 37 to inhibit rotation of the reel receiver 4b. Further, the rotating plate 22 is returned to the initial position by the one end 30 of the locking member 29, the rotation transmission path by the tape slack eliminating rotation transmission means is closed, and the tape before the reproduction operation is started at the next reproduction operation. Prepare for the slack eliminating operation.

By the eject operation, the cassette holder moves from the cassette loading position to the cassette loading / unloading position.

Next, a third embodiment of the present invention will be described with reference to FIGS. 11 to 13.

This embodiment is an example using a detection means 61 for detecting the rotation state of the reel receiver 4a by magnetic or electric means. The detection means 61 is provided with a disc 63 having small magnets 62 arranged all around the lower end of one reel receiver 4a, and the disc 63
A magnetic sensing switch 64 is arranged in the vicinity of 63, and a control circuit 65 including an amplifier is connected to the switch 64.

Then, the control circuit 65 is provided with an electromagnetic plunger 67 for releasing pressure inhibition (a magnetic drive means for releasing pressure inhibition) and a reverse driving electromagnetic plunger 69 (for reverse driving) that drives the auto-reverse mechanism 68 via the changeover switch 66. (Magnetic drive means) is connected in parallel, and as shown in FIGS. 11 and 12, the electromagnetic plunger 67 for releasing the crimp inhibition is released while the rotation transmission path by the transmission gear 70 (tape slack eliminating transmission means) is closed. The reverse drive electromagnetic plunger 69 is connected to the control circuit 65 when it is connected to the control circuit 65 and the rotation transmission path by the transmission gear 70 is cut off as shown in FIG.

Therefore, when the tape cassette 42 in which the tape T is loose as shown in FIG. 11 is loaded and the motor 2 is started, the small gear
19 rotates, and the rotation is transmitted by the transmission gear 70 and the reel gear 21a.
Is transmitted to the reel receiver 4a via.

At this time, the disk 63 rotates together with the reel receiver 4a, and this rotation state is detected by the magnetic detection switch 64, and a constant pulse signal is output to the control circuit 65. However, as shown in FIG. When the disk 63 stops together with the reel receiver 4a, the output of the pulse signal to the control circuit 65 disappears. As a result, the control circuit 65 outputs a control signal to the electromagnetic plunger 67, and the electromagnetic plunger 67 operates and the 13th
The locking member 29 is rotated as shown. Then, the stopper pin 32 disengages from the locked portion 39 to move the head mounting plate 8 forward, and at the same time, the brake piece 33 separates from the engaged plate 37 to release the rotation inhibition of the reel receiver 4b. , Second
Operations similar to those in the embodiment are performed.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, the rotation state of the reel receiver 4a is detected by the same detection means 61 as in the third embodiment, and the electromagnetic plunger 71 is operated by the detection signal when the looseness of the tape T is eliminated.

Further, the head mounting plate 8 is always biased in the backward direction by the spring 72, and the head mounting plate 8 is moved forward by the rotational force of the toothless gear 74 having the cam 73.

The head mounting plate 8 has a brake piece 75 in a part thereof, and when it is in the retracted position, this brake piece 75 is received by the other reel receiving plate.
The reel gear 21b on the 4b side is pressed to inhibit the rotation of the reel receiver 4b.

The partly tooth-missing gear 74 is located at a position where it can mesh with the small gear 19 that is rotatably connected to the tape drive motor 2, but the trigger lever 74 is normally engaged
76 engages with the first engaging portion 77 and is locked at a position where the toothless portion 78 faces the small gear 19.

A cam pin 80 provided at one end of a rotating lever 79 is engaged with the cam 73 of the toothless gear 74, and one end of a torsion spring 81 attached to the head mounting plate 8 is engaged with the other end of the rotating lever 79. I am combining.

The other end of the torsion spring 81 extends into the engaging recess 84 of the rotating plate 83 supporting the transmission gear 82.

Then, when the tape cassette 42 having loose tape is loaded and the motor 2 is started, the small gear 19 rotates, and the rotation is transmitted to the reel receiver 4a.

At this time, the rotation state of the disk 63 rotating together with the reel receiver 4a is detected by the magnetic sensing switch 64, and when the looseness of the tape is eliminated and the disk 63 stops together with the reel receiver 4a, the control circuit 65 The pulse signal output disappears. As a result, the control circuit 65 outputs a control signal to the electromagnetic plunger 71 to activate the electromagnetic plunger 71. The electromagnetic plunger 71 rotates the trigger lever 85. Then,
The partly tooth-missing gear 74 is unlocked by the trigger lever 85, and the tip end of the trigger lever 85 pushes the inclined surface 86 to rotate slightly and mesh with the small gear 19. Therefore, the toothless gear 74 is the small gear 19
The tooth-missing gear 74 makes about one rotation, and the tooth-missing portion is rotated again.
78 is opposed to the small gear 19, and the trigger lever is the second engaging portion 87.
By the action of the cam 73, the rotating lever 79 is largely rotated until it hits the head mounting plate 8 via the torsion spring 81 by the rotating force of the rotating lever 79. Along with this, the brake piece 75 is separated from the reel gear 21a to release the brake of the reel receiver 4a, and the rotating plate 83 is rotated via the torsion spring 81, so that the transmission gear 82 is connected to the reel gear 4a.
And separate from the small gear 19.

When the eject operation is performed, the electromagnetic plunger 71 is de-energized, and the trigger lever 85 is disengaged from the second engaging portion 87, so that the head mounting plate 8 is released from the forward movement position and the spring 72 causes the initial state. Return to position and return.

Although various embodiments have been described above, the present invention is not limited to these. For example, the above embodiment has been described as detecting the rotation state of the reel receiver 4a, but this detecting means detects the looseness state of the tape between the pair of reel receivers 4a and 4b by mechanical, electrical or other means. It may be done.

(Effects of the Invention) As described in detail above, according to the present invention, when the tape in the loaded cassette has slack, the pinch roller does not press against the capstan, so that the reproducing operation is not performed immediately. Absent. Then, one reel receiver is rotationally driven through the tape slack eliminating rotation transmitting means, and the other reel receiver is prevented from rotating by the braking means, so that the slack is automatically eliminated. When the slack is eliminated in this way, it is detected by the detection means, the rotation transmission path from the motor to one reel receiver by the tape slack elimination rotation transmission means is cut off, and the braking means The control function and the pinch-roller pressure-bonding prohibition function of the pinch-roller pressure-bonding prohibition means disappear, and the reproducing operation is started.

Therefore, there is no hassle to check whether the tape in the cassette is loose before loading, and even if the tape is loose, the slack is automatically canceled before the playback operation is started, so the operation is exceptional. It will not be complicated. In addition, since the slack of the tape is eliminated by rotating one reel receiver and prohibiting the rotation of the other reel receiver, the tape position at the start of the reproducing operation is based on the other reel side, and the tape position is disturbed. Does not fluctuate.

[Brief description of drawings]

1 to 9 show the first embodiment, FIG. 1 is an exploded perspective view of a peripheral portion of a cassette holder, FIG. 2 is a plan view showing a relationship between a head mounting plate and eject operation means, FIGS. 3 and 4 are schematic side views showing different positions of the cassette holder, and FIG. 5 is a perspective view showing the relationship between the reproducing operation action rotation transmitting means, the head mounting plate and the tape running direction control plate, and FIG. 9 to 9 are plan views showing the operation of the tape slack eliminating device. FIG. 10 is a plan view showing the second embodiment. 11 to 13 are plan views showing the operation of the tape slack eliminating device in the third embodiment. FIG. 14 is a plan view showing the fourth embodiment. T ... Magnetic tape, 1 ... Cassette holder, 2 ... Tape drive motor, 3 ... Eject operation means, 4a, 4b ... Reel receiver, 5 ... Detection means, 6 ... Braking means, 7 ... Magnetic head, 8 ... Head mounting plate, 16a, 16b ... Pinch rollers, 17a, 1
7b ... Capstan, 18 ... Rotation transmission means for reproduction operation, 20 ...
Rotation transmitting means for eliminating tape slack, 27 ... Engaging step portion, 29 ... Engaging member, 39 ... Engagement portion, 41 ... Pinch roller pressing inhibiting means, 64 ... Sensing means, 65 ... Control circuit, 66 ... Changeover switch , 67… Electromagnetic plunger for releasing crimp prohibition, 68… Auto reverse mechanism, 69… Electromagnetic plunger for reverse drive.

Claims (9)

[Claims] 1. A motor (2) which is started by loading a tape cassette on a first and a second reel receiver (4a, 4b) and is stopped by ejecting the tape cassette, and a rotation of the motor is a capstan. (17a, 17
b) and a reproduction operation rotation transmission means (18) for transmitting to one of the reel receivers, braking means for prohibiting rotation of the second reel receiver set when the tape cassette is ejected (6)
And a rotation transmission body (23) constituting a tape slack eliminating rotation path (20) for transmitting the rotational force of the motor to the first reel receiver, separately from the reproduction operation rotation transmission means, and this rotation transmission A support body that supports the body (23), is set to a predetermined position when the tape cassette is ejected, forms the rotation transmission means for eliminating the tape slack, and blocks the rotation transmission path when the tape cassette is separated from the predetermined position. (twenty two)
And a detection means (5) for detecting the tension state of the tape between the first and second reel receivers from the rotational state of the first reel receiver when the first reel receiver is rotationally driven via the rotation transmission body. ) And when the tape tension state is detected by the detection means, the support is moved from a predetermined position to block the tape slack eliminating rotation transmission path, and the second reel receiver by the braking means is removed. A tape recorder comprising: a slack eliminating means (26, 27, 31) for canceling the prohibition of rotation of the tape recorder. 2. The tape recorder according to claim 1, further comprising pinch roller crimping prohibiting means (41) for prohibiting crimping of the pinch roller to the capstan when the tape cassette is loaded, wherein the slack eliminating means is A tape recorder, wherein when the tension state of the tape between the first and second reel receivers is detected, the pinch roller crimping prohibition means releases the pinch roller crimping prohibition. 3. A means for crimping a pinch roller to a capstan is provided on a head mounting plate that is moved forward during a reproducing operation, and a pinch roller crimping prohibiting means prevents the head mounting plate from moving forward. 3. The method according to claim 2, which comprises a prohibiting means.
Tape recorder described in. 4. The engagement means comprising a brake piece (33) which engages with an engaged portion (37) provided on the second reel receiver to inhibit rotation of the second reel receiver. Stop member (2
9), wherein the pinch roller press-fitting prohibiting means is provided on the locking member and engages with the head mounting plate to advance when the locking member prohibits rotation of the second reel receiver. The tape recorder according to claim 3, wherein the tape recorder comprises a stopper pin (32) for inhibiting movement. 5. The head mounting plate is engaged with a stopper portion (39) which engages with a stopper pin of the engaging member to prevent its forward movement when in the retracted position, and the stopper pin engages with the engaged portion (39). When it is disengaged from the stopper, the stopper pin is largely moved by its forward movement to position the brake piece of the locking member at a position sufficiently separated from the engaged portion provided on the second reel receiver. The tape recorder according to claim 4, further comprising a portion (40). 6. The locking member is provided with an engaging portion (30) for engaging a support body that supports the rotation transmitting body, and when the stopper pin is largely moved by the inclined portion of the head mounting plate, the stopper member moves. The tape recorder according to claim 5, wherein the support is moved to a position where the rotation transmission path for eliminating tape slack is completely blocked. 7. The slack eliminating means includes an engaging portion (27) provided on a rotation transmitting body forming a part of a tape slack eliminating rotation transmitting path, and the rotation transmitting by engaging with the engaging portion. The second rotating member is moved by the rotational force of the body and is displaced by the brake means.
Crimping prohibition releasing member (31) for canceling the prohibition of rotation of the reel receiver, and engagement between the crimping prohibition releasing member (31) and the engaging portion (27) by receiving the rotational force of the first reel receiver. A tape recorder according to claim 1, characterized in that it comprises means (26, 36) for avoiding. 8. An eccentric cam (2) provided on a rotation transmitting body is a means for avoiding the engagement between the pressure-bonding inhibition releasing member and the engaging portion.
6) and the cam pin (3
5) and a rotation detecting piece (36) for rotationally displacing by receiving the rotational force of the first reel receiver to cause the cam pin to follow the eccentric cam and maintain the cam pin and the engaging portion in a disengaged state. )
The tape recorder according to claim 7, wherein the tape recorder comprises: 9. The tape recorder according to claim 1, further comprising an auto-reverse mechanism for reversing a tape reproduction direction, wherein the detection means is a first rotation transmission means for reproduction operation.
Detecting the tension state of the tape between the first and second reel receivers even when the reel receiver is rotationally driven. When the first reel receiver is switched by the position and the first reel receiver is rotationally driven through the rotating body, the slack eliminating means is operated, and the first reel receiver is rotated through the reproduction operation rotation transmitting means. A tape recorder provided with a changeover switch for activating the auto-reverse mechanism when driven.