JPH0157418B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cassette deck.

In recent years, cassette decks have been trending toward smaller sizes, and in particular, there is a strong demand for smaller or thinner cassette decks for automobiles, as there is a limit to the space in which the cassette decks can be accommodated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cassette deck which is small in size and allows smooth loading and unloading of cassette halves.

In the cassette deck according to the present invention, there is no solenoid for moving the head table forward or backward, but the head table is moved forward by the torque of the electric motor for driving the tape reel, and the head table is locked at a predetermined forward position. In response to the eject command, the key-off solenoid that maintains the lock is de-energized to release the lock, and after the key-off solenoid is de-energized, power supply to the electric motor is stopped.

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

FIG. 1 is a schematic side view of one embodiment of a cassette loading, holding and ejecting mechanism according to the present invention;
FIG. 2 shows a schematic plan view thereof, and FIG. 3 shows a schematic front view thereof. In the figure, a cassette pushing lever 2 is engaged with a side frame 1 so as to be slidable in the left-right direction in the figure, and a first arm 3
is rotatably supported around a shaft 3a. The first arm 3 engages with a hole 2a formed in the cassette push lever 2 and elongated in the vertical direction in the figure through a pin 3b provided at its tip, and the first arm 3 engages with a hole 2a formed in the cassette push lever 2 and which is elongated in the vertical direction in the figure. By moving the push lever 2 to the left, it rotates counterclockwise. The tip of the lever 2 is formed into an L-shape so that the tip of the inserted cassette half 15 can come into contact with it. The first arm 3 has a first lever 4 with a shaft 4a.
When the first arm 3 rotates, the first lever 4 moves to the left in FIG. 1, that is, in the cassette insertion direction. 2, it is energized in the right direction in FIG.

The second lever 6 is slidably engaged with the side frame 1 in the insertion/ejection direction of the cassette half, and when the first lever 4 moves to the left, Protrusion 6a
By engaging with the pawl 4b of the first lever 4 at It is energized in the ejection direction. A third lever 8 is slidably attached to the second lever 6 and biased by a spring 9 in the cassette insertion direction with respect to the second lever 6. The third lever 8 has its tip 8a engaged with one end 11a of a rotating arm 11 that is rotatably supported on the side frame 1 about a shaft 10, and is rotated by the biasing force of the spring 9. The movable arm 11 is energized clockwise.

A fifth lever 13 is rotatably attached to a fourth lever 12 that is movable to the right from the position shown in FIG. The fourth lever 12 is biased in the cassette insertion direction and the fifth lever 13 is biased in the counterclockwise direction in FIG. 1 by a spring 14 stretched between the two. The inclined surface of the fifth lever 13 engages with a pin 6b provided on the second lever 6, and when the cassette half 15 is inserted, the second lever 6 moves in the cassette insertion direction in conjunction with the cassette push lever 2. By doing so, the cassette half 1 rotates counterclockwise.
When the cassette push lever 5 is completely inserted to the back, the recess fits into the pin 2b provided on the cassette push lever 2, thereby locking the cassette push lever 2.

The cassette holder 16 has a substantially rectangular shape, and is rotatably supported by the side frames 1 and 17 about a dotted line B as a central axis, and one end of the cassette holder 16 is engaged with the tip of the rotating arm 11. Further, the cassette holder 16 is restricted from rotating by engaging with the left end portion of the fourth lever 12, and when the cassette half 15 is fully inserted to the rear, that is, the pin 2b is locked by the fifth lever 13. The fourth lever 12 is slightly moved to the right via the fifth lever 13 by the forces of the springs 5 and 7 acting on the pin 2b, thereby releasing the rotation restriction. This allows the cassette holder 1
6 is rotated clockwise by the biasing force acting on the rotating arm 11, and pushes down the cassette half 15, which has been completely inserted, to the tape playing position. At this time, the reel holes (not shown) of the cassette half 15 engage with the reel units 18a and 18b, respectively.

When the cassette half 15 is inserted, as shown in FIG. 3, the cassette half 15 has a substantially rectangular shaped cassette support plate 19 and a cassette support plate 19 which are approximately rectangular in shape and are rotatable about a fulcrum 19c at the lower main surface 15a in FIG. It is supported by the auxiliary arm 20 and held from above by the cassette holder 16 at the other main surface 15b. The cassette support plate 19 supports the cassette half 15
It has a pair of holes 19d and 19e for engagement with the reel units 18a and 18b. The rotational axis of the cassette holder 16 and the rotational axis of the cassette support plate 19 are perpendicular to the lowering and raising directions of the cassette half 15, and extend preferably along orthogonal directions at a predetermined distance from each other. That is, the free edges of the cassette holder 16 and the cassette support plate 19 are shaped like the cassette half 1 when inserted to a position where it can be engaged with the reel units 18a, 18b.
The cassette halves 15 are disposed so as to be perpendicular to each other near the center of the cassette half 15. Cassette support plate 19
is the fulcrum point 1 relative to the underframe (not shown)
The rotating arm 11 is provided to be rotatable around 9c, and the rotating arm 11 is provided via a lifting arm 21 rotatably attached to a back frame (not shown).
It is held in the position shown in the third figure by engaging the rear end of. When the cassette half 15 is lowered, the cassette holder 16 and the cassette support plate 19 rotate in conjunction with the rotating arm 11 while holding the cassette half 15, thereby lowering the cassette half 15 and attaching it to the reel units 18a, 18b. In order to support the cassette half 15 more reliably, the above-mentioned auxiliary arm 20 is rotatably attached to the underframe. are engaged, and the cassette half 15 is engaged with the reel units 18a, 18.
When the cassette is attached to the cassette support plate 19, it is folded together with the cassette support plate 19 as shown by the dashed line in FIG.

The cassette half 15 attached to the reel units 18a, 18b has a cassette push spring 22 (third
(illustrated) in the direction of the head, which will be described later.
The cassette pushing spring 22 is retracted from the lowering path of the cassette half 15 by being pressed by the rear end 19b of the cassette support plate 19 so as not to hinder the lowering movement of the cassette half 15. Rear end portion 19b of time support plate 19
As it rotates about the fulcrum 19c, it gradually moves forward and energizes the cassette half 15.

In FIG. 2, guide pins 23a and 23b and capstans 24a and 24b are fitted into holes formed in the cassette half 15, respectively. Head 25 and pinch rollers 26a, 26b
The head stand 27 on which the head stand 27 is mounted is movable in the vertical direction in the figure, and is driven by means not shown during playback (PLAY) or when detecting an interval (unrecorded band) to advance from the position shown in the second figure (second position). (move downward in the diagram). As a result, the head 25 comes into pressure contact with the tape, and the rubber roller 26a or 26b moves the tape to the capstan 2 depending on the direction of tape movement.
4a or 24b. When the head stand 27 is in the forward state, its tip 27a is positioned on the pin 21a provided at the tip of the lifting arm 21, thereby regulating the rotation of the lifting arm 21 and ejecting the cassette half 15. is prohibited.

Reference numeral 28 is an FF lever that commands fast forwarding (FF) of the tape, and reference numeral 29 is a REW lever that commands rewinding (REW) of the tape, and these are slidably attached to the side frame 17.
Pins 30 and 31 are fixed to the FF lever 28 and the REW lever 29, respectively.
0, 31 are the engaging ends 32a, 3 of the second arm 32.
2b is engaged. The second arm 32 is attached to a pin 34 fixed to a first cam 33 that is slidable with respect to the side frame 17. Here, when the FF lever 28 and the REW lever 29 are pressed individually, they act as levers that command FF and REW, but when both are pressed simultaneously, they act as levers that command EJECT. That is, when both levers 28 and 29 are pressed simultaneously, the amount of movement of the pin 34 is twice the amount of movement when each lever is pressed individually, and the eject operation is performed based on this difference in movement amount.

The amount of movement of the pin 34 directly becomes the amount of movement of the first cam 33, and the first cam 33 moves the FF lever 28 and
When the REW lever 29 is moved a predetermined amount to the left in FIG. 2 in response to the eject operation by simultaneously pressing the REW lever 29, the claw 33a comes into contact with one end of the rotatable third arm 35 and rotates it counterclockwise. . The other end of the third arm 35 is engaged with one end 38a of a rotatable lock release lever 38 via a connecting lever 37 which is biased upward in the figure by a spring 36. The other end 38b of the lock release lever 38 is moved downward in FIG. 1 by the eject operation, and is brought to a position where it can be engaged with the other end 38b when loading a cassette. Release the lock by pressing down.

FIG. 4 is a plan view of the cassette holder 16, and the cassette holder 16 is provided with a cassette ejection prevention mechanism 39. The cassette ejection prevention mechanism 39 is for preventing the cassette half 15 from ejecting from the insertion slot when the cassette is ejected, and the stopper arm 40 serves as a locking member that is rotatable along the main surface of the cassette holder 16.
and a spring 41 that urges this arm 40 in a counterclockwise direction. The stopper arm 40 has a projection (not shown) on its lower surface that can be engaged with a reel hole that fits into the reel unit 18a (second illustration) of the cassette half 15.
A pair of protrusions 1 provided on the cassette holder 16
Rotation is restricted by 6a and 16b. During insertion of the cassette, the protrusion engages with the reel hole when the cassette half is fully inserted. Further, the protrusion of the stopper arm 40 engages with the reel hole of the cassette half 15 lifted by the cassette support plate 19 at the time of ejection, and the stopper arm 40, which rotates in conjunction with the cassette half 15 that pops out, closes the stopper 16b. The cassette half 15 is stopped when it comes into contact with the cassette half 15 and its rotation is restricted.

Next, the operation of this configuration will be explained with reference to FIGS. 5 to 11.

First, when loading a cassette, the tip of the inserted cassette half 15 is pushed into the L position of the cassette push lever 2.
The lever 2 is brought into contact with the tip of the letter and moved in the direction of the arrow shown in FIG. The movement of the lever 2 causes the first arm 3 to rotate counterclockwise and move the first lever 4 in the direction of the arrow. The spring 5 is then stretched. As shown in FIG. 6, the first lever 4 moves the second lever 6 in the direction of the arrow by engagement between the claw 4b at the tip and the protrusion 6a of the second lever 6. At this time, the second lever 6 stretches the spring 7 and also pulls the third lever 8 via the spring 9, as shown in FIG. Therefore, the tip 8a of the third lever 8
The rotating arm 11, whose one end 11a is engaged with the rotating arm 11, is biased clockwise by the spring 9. The force of this spring 9 is applied to the inserted cassette half 15.
It provides the holding force when descending.

As the cassette push lever 2 moves, the pin 2a fixed to it moves, and at the same time the pin 6b fixed to the second lever 6 also moves in the direction of the arrow shown in FIG. 8, so it is energized by a spring 14. When the fifth lever 13 rotates counterclockwise and the cassette half 15 is fully inserted, the pin 2a is locked in its recess. As a result, the forces of springs 5 and 7 act on the pin 2a, and the fifth lever 1
3, move the fourth lever 12 slightly to the right in the figure. As the fourth lever 12 moves, the left end of the fourth lever 12 and the cassette holder 1
6 is released, and the cassette holder 16, whose rotation has been restricted until then, rotates clockwise and presses the cassette half 15 from above. at the same time,
The cassette support plate 19 and the auxiliary arm 20 (shown in the third figure), whose rotation was restricted by engaging with the rear end of the rotation arm 11 via the lifting arm 21, also rotate and cooperate with the cassette holder 16. While holding the cassette half 15, it is lowered and attached to the reel units 18a and 18b. Cassette half 1 attached to reel units 18a and 18b
5 is urged toward the head 25 by a cassette pushing spring 22.

When ejecting, by pressing the FF lever 28 and the REW lever 29 at the same time, the second arm 32 is activated by pressing the two pins 30 and 3 fixed to each lever.
1, the pin 34 is moved by twice the amount of movement during FF or REW. As a result, the first cam 33
moves in the direction of the arrow as shown in FIG.
comes into contact with one end of the third arm 35, thereby rotating the arm 35 in the counterclockwise direction. As the third arm 35 rotates, the connecting lever 37 moves to the left as shown in FIG. 10, causing the lock release lever 38 to rotate counterclockwise.

The lock release lever 38 is activated by pressing down the tip of the first lever 4 as shown in FIG.
The engagement between the claw 4b of the lever 4 and the protrusion 6b of the second lever 6 is released. As a result, the second lever 6 moves to the right, and the protrusion 6c engages with one end of the rotating arm 11, thereby rotating the rotating arm 11 counterclockwise. As the rotating arm 11 rotates, the cassette holder 16, cassette support plate 19, and auxiliary arm 20 lift the cassette half 15 while holding it there. Further, when the cassette half 15 is raised, the pin 6b of the second lever 6 that is engaged with the inclined surface of the fifth lever 13 moves clockwise, so that the fifth lever 13 rotates clockwise, and the raising of the cassette half 15 is completed. At this point, the pin 2b fixed to the cassette push lever 2 is unlocked. Therefore,
The cassette push lever 2 moves to the right and ejects the cassette half 15. The force required for lifting and ejecting the cassette half 15 during this ejection is provided by the springs 5 and 7, which are stretched during loading.

FIG. 12 is a schematic plan view of an embodiment of the reel stand rotation stop sensing mechanism. The sensing mechanism is for detecting that the rotation of the reel stand has stopped, such as at the end of the tape. In the figure, engagement arms 43a and 43b are frictionally engaged with reel stands 42a and 42b constituting reel units 18a and 18b, respectively. A swing arm 45 is inserted into the hole provided at the tip of the engagement arms 43a, 43b via pins 44a, 44b.
is engaged. One end of a rotatable fourth arm 46 is engaged with a swing pin 44c fixed to the swing arm 45, and one end of a rotatable fifth arm 47 is engaged with the other end of the fourth arm 46. It matches. Reel stands 42a, 42b counterclockwise (normal direction)
, the engaging arms 44a, 44b move in the direction of the arrow in the figure. The engaging arm 44a is stopped at the position shown in the figure when one end of the swinging arm 45 comes into contact with a locking pin 49a fixed to the chassis 48. On the other hand, the engagement arm 44b always tries to rotate to the position where it comes into contact with the protrusion 48b of the chassis 48, and as a result, the engagement arm 44b
Turn the arm 46 counterclockwise, and then turn the fifth arm 47
drive clockwise.

A pawl 47a provided at the other end of the fifth arm 47 engages with the outer periphery of an internal gear 50, which is constantly rotationally driven by a motor to be described later. The figure shows a developed view of the outer periphery of the internal gear 50, in which a wavy cam 50a is formed on one side, and a protrusion 50 is formed on the other side facing the trough of the wavy cam 50a.
b is provided. Therefore, as mentioned above, the fifth
When the arm 47 is driven clockwise, the pawl 47a is pressed against the cam 50a side of the internal gear 50, and therefore moves left and right along the shape of the cam 50a. When the reel stands 42a, 42b stop and the force driving the fifth arm 47 in the clockwise direction disappears, the claw 47a of the arm stops at the peak of the cam 50a as shown by the dashed line, and the protrusion 50b of the internal gear 50 stops. The rotation of the internal gear 50 is stopped by contacting the internal gear 50. By stopping the rotation of the internal gear 50, it is possible to detect that the slack in the tape has been taken up or the end of the tape.

In addition, in the case of tape slack removal, one reel stand is stopped from rotating by a ratchet mechanism (not shown), and the other reel stand rotates at high speed to take up the tape slack and stop rotation. It's summery. Further, when the reel stands 42a, 42b rotate clockwise (reverse direction), the engagement arm 43b is stopped by the locking pin 49b,
Since the engagement arm 43a always tries to rotate clockwise, the fifth arm 47 is driven clockwise via the swing arm 45 and the fourth arm 46, and the same operation as in the normal direction is performed. .

FIG. 13 is a schematic side view of one embodiment of the headstand drive mechanism, and FIG. 14 is a schematic plan view of a portion thereof. In the figure, 50 is an internal gear in the above-mentioned sensing mechanism, and the first
As shown in Fig. 5, a worm gear 51 and a belt 5
It is constantly rotationally driven by a motor 53 via 2. As shown in FIG. 16, the internal gear (ring gear) 50 is rotatably attached to a gear member 54 driven by a worm gear 51 and connected to a sun gear 54a of the gear member via a planetary gear 55.
It meshes with the The planetary gear 55 is rotatably attached to a gear pig or support member 57 which is rotatably supported by a central shaft 56 . A pin 58 is installed on the front side of the gear piggyback 57, and a sixth lever, that is, a crank lever 60 is engaged with this pin 58 via a roller 59.

If the internal gear 50 is now rotatable, the planetary gear 55 rotates while remaining at a fixed position because the rotation of the gear cover 57 is prevented by the sixth lever 60, thereby rotating the internal gear 50. Here, when the rotation of the internal gear 50 is stopped by the above-mentioned sensing mechanism detecting that the slack in the tape has been removed, the planetary gear 55 rotates about the central shaft 56 while rotating. As a result, gear piggy 5
7 also rotated and engaged with the pin 58, the sixth lever 60
drive in the direction of the arrow. After the sixth lever 60 reaches the left dead center, it is returned to its original position by the force of the spring 61, so that the planetary gear 55 and the gear knob 57 have made one rotation. That is, with this configuration, the rotational movement of the motor 53 is controlled by the sixth lever 6.
It is converted into zero linear motion.

In FIG. 13, when the sixth lever 60 moves to the left in the figure, the sixth arm 62 rotatably attached to the sixth lever 60 also moves.
A pin 63 is fixed to the free end of the sixth arm 62, and as the sixth arm 62 moves, the pin 63 abuts one end of the seventh lever 64 and moves it to the left in the figure. A pin 65 is fixed to the tip of the seventh lever 64, and normally engages with the tip of a freely rotatable seventh arm 66. The seventh arm 66 is driven counterclockwise by a key-off solenoid 67 which is energized from when the cassette is inserted to when it is ejected. Therefore, the seventh lever 64 that has moved to the left is locked by the pin 65 fitting into the hook portion 66a of the seventh arm 66. After the seventh lever 64 is locked, the sixth lever 60
is restored by the force of the spring 61. Also,
An eighth arm 68 rotatably provided on the chassis via a pin 68a engages with a protrusion 64a of the seventh lever 64 via a spring 69, and is further provided with an elongated hole 68b formed at its tip. It engages with a pin 62a provided on the sixth arm 62. Therefore, when the seventh lever 64 moves to the left, the spring 69
The force causes the eighth arm 68 and the sixth arm 62 to move as shown in FIG.

As shown in FIG. 17, the seventh lever 64 has a rotatable ninth arm 70 with a pin 70 at one end.
They are engaged via a. One end of a rotatable eleventh arm 72 is engaged with the other end of the ninth arm 70 via a tenth arm 71. The 11th arm 72 is biased clockwise by a spring 73, and when the 7th lever 64 moves to the left in the figure, it is driven clockwise via the 9th arm 70 and the 10th arm 71, and the other end The head stand 27 engaged through the pin 74 is advanced to the position shown by the broken line. As described above, when the head stand 27 is moved forward, its tip 27a is attached to the lifting arm 21.
By being located on the pin 21a (shown in the second figure), rotation of the lifting arm 21 is restricted and ejection of the cassette half is prohibited. When the cassette half is ejected or the power is turned off, the key-off solenoid 67 is turned off, so the seventh lever 64 is urged rightward in the figure by the force of the spring 109 (shown in the third figure), and the seventh arm 66 is pushed by the pin 65.
Return to the original position by rotating it clockwise.
As a result, the head stand 27 moves back and its tip 27
The restriction on rotation of the lifting arm 21 by a is released.

FIG. 18 shows an example of a control circuit for the motor 53 and the key-off solenoid 67. The motor 53 is connected between the power supply +B and ground via the switch _SW1 , and the key-off solenoid 67 is connected to the switch SW1.
Connected between power supply +B and ground via SW ₂ . The switches SW ₁ and SW ₂ are the protrusion 8a of the third lever 8 and the protrusion 6 of the second lever 6 shown in FIG.
c.
The second lever 6 and the third lever 8 are interlocked when loading and ejecting a cassette, and the positional relationship between the switches SW ₁ and SW ₂ and the protrusions 8a and 6c is as shown in FIG. 19. That is, before the cassette is inserted, the switch SW ₁ is in the OFF state because its actuator is pressed by the projection 8a of the third lever 8, and the switch SW ₂ is not engaged with the projection 6c of the second lever 6. . and,
When the cassette is inserted, the protrusions 8a and 6c move simultaneously in the direction of the arrows, and as a result of the disengagement with the protrusion 8a, the switch _SW1 is turned on and starts the motor 53, and then the protrusion 6c is turned on.
By pressing SW ₂ , switch SW ₂ is turned on and the key-off solenoid 67 is energized.

On the other hand, when the cassette is being ejected, the engagement with the protrusion 6c is released due to the reverse action of the insertion, so that the switch SW ₂ is first turned off, and the excitation of the key-off solenoid 67 is released, and a predetermined period of time has elapsed. When the rear projection 8a presses the actuator of the switch SW ₁ , the switch SW ₁ is turned off and the motor 53 is stopped. In this way, by de-energizing the key-off solenoid 67 before the motor 53 stops at the time of ejection, the head stand 27 (shown in Figure 17) is driven by the motor 53.
Even if an eject operation is performed while the head 27 is being driven forward, the eject operation is reliably performed without the head stand 27 stopping midway.

FIG. 20a is a schematic front view of one embodiment of the forward/reverse rotation switching mechanism, and FIG. 21 is a schematic side view of a portion thereof. In the figure, a worm gear 75 is connected to the aforementioned motor 53 via a belt 76.
(shown in Figure 15), the first gear 7
7 to drive the second gear 78. 2nd gear 78
A toothless portion 79a of a toothless gear 79 is opposed to. The partially toothed gear 79 is started by a starting mechanism described below, meshing with the second gear 78 and switching between forward and reverse rotation.

As shown in FIG. 22, the activation mechanism is electrically activated by a solenoid 80, mechanically activated by the above-mentioned sensing mechanism, or manually activated.
The lever 81 is driven to the left in the figure to start the partially toothed gear 79. In FIG. 22, the head of the sixth arm 62 moves forward and the key-off solenoid 67 (the first
3), the pin 63 is in contact with the eighth lever 81. Therefore, when the reel stand stops at the end of the tape, the sensing mechanism is activated, and the sixth arm 62 is driven to the left, the pin 63 of the arm 62 engages with the hook portion 81a of the eighth lever 81, causing the eighth lever 81 to move. Drive in the direction of the arrow. By energizing the solenoid 80, the eighth lever 81 is similarly driven in the direction of the arrow. As a result, the pin 82 provided at the tip of the eighth lever 81 comes into contact with the protrusion 83a of the ninth lever 83, so that the ninth lever 83 similarly moves in the direction of the arrow. As shown in FIG. 23, the ninth lever 83 is biased toward the right in the figure by a spring 84.
By moving to the left, the twelfth arm 85, which is rotatable at its tip, is rotated counterclockwise.
The twelfth arm 85 is biased clockwise by a spring 86, and its tip protrusion 85a engages the partially toothed gear 7.
9 is locked. In other words, the partially toothed gear 79 is
A pair of pins 87a, 8 are located approximately 90 degrees from the two toothless portions 79a provided at an angle of 180 degrees.
7b and is urged counterclockwise by a spring 88, and its rotation is restricted by a protrusion 85a of the twelfth arm 85 engaged with a pin 87a (or 87b). Then, the restriction is released by rotating the twelfth arm 85 counterclockwise, and the partially toothed gear 79 is rotated counterclockwise by the spring 88 and the second arm 85 is rotated counterclockwise.
It meshes with gear 78. It is rotationally driven by the second gear 78, rotates 180 degrees, and when the toothless portion 79a faces the second gear 78, it is locked again by the protrusion 85a of the twelfth arm 85.

In FIGS. 20a and 21, the missing tooth portion 79
rotates 180 degrees to move the ninth lever 89 engaged with the pin 79b to the right. The ninth lever 89 drives the second cam 91 downward in the figure via the rotatable thirteenth arm 90. Idler plates 92a and 92b are attached to pins 93 on the cam surface of the second cam 91.
They are engaged as shown in the figure via a and 93b.
In the illustrated position, the device is in a reverse play state. The idler plate 92a is connected to the reel unit 18a on the normal play (forward playback) side.
Correspondingly, the idler plate 92b corresponds to the reel unit 18b on the reverse play side. By moving downward in the figure, the second cam 91 moves the idler plates 92a and 92b in the direction of the arrow, separating the reverse side idler gear 94b from the outer gear of the reel stand 42b, and disconnects the normal side idler gear 94a.
Attach the idler spring 95 to the outer gear of the reel stand 42a.
Engage with force a. Further, the second cam 91 drives the idler plates 92a and 92b and simultaneously drives the NR
(Normal/Reverse) also activate switch SW ₃ . By switching this switch _SW3 , the head 25 is switched from reverse to normal. Note that 96a and 96b are the capstan 24.
It is a flywheel that rotates together with a and 24b (second illustration).

A third cam 97 is also engaged with the thirteenth arm 90, and moves downward in the figure in synchronization with the second cam 91 when the thirteenth arm 90 rotates. Roller arms 98a and 98b rotatably supporting pinch rollers 26a and 26b, respectively, are engaged with the cam surface of the third cam 97 via pins 99a and 99b as shown in FIG. 20a during reverse play. The roller arms 98a, 98b are as shown in FIG. 20b.
Pins 107a, 107 fixed to head stand 27
The pinch rollers 26a, 26b are biased in the direction of pressing the pinch rollers 26a, 26b against the capstans 24a, 24b, respectively, by springs 100a, 100b, which are rotatably attached to the capstans 24a, 24b, and have one end engaged with the head stand 27 and the other end engaged with the pins 99a, 99b. ing. spring 100
a, 100b first move the pinch rollers 26a, 26b to the capstans 24a, 2 when the head stand 27 moves forward.
4b, and the head stand 27 is pressed against the lower chassis 108b by a rotational moment in a plane perpendicular to the chassis surface around the pivot point. By moving the third cam 97 downward in FIG. 20a, the roller arms 98a and 98b are rotated in the directions of the arrows to release the pressure contact between the reverse side capstan 24b and the pinch roller 26b, and the normal side capstan 24a is released. The pinch roller 26a is brought into pressure contact with the pinch roller 26a. These operations switch the tape running direction. In addition, in FIG. 22, the hook portion 81a of the eighth lever 81 is connected to the pin 63 of the sixth arm 62 when the eject operation is performed during the direction switching operation.
prevents the head from returning to its original position where it can drive the head stand.

FIG. 24 is a schematic plan view of one embodiment of the fast forward (FF)/rewind (REW) mechanism. This figure shows the state at the time of play, and the 17th
As explained in the figure, when the head is driven forward,
The eleventh arm 72 is driven clockwise via the tenth arm 71 and is at the position shown. 11th arm 72
A fourteenth arm 101, which is rotatable and biased clockwise by a spring 102, is engaged through a pin 101a, and during play, the pin 101a is
Each hook part 2 of the FF lever 28 and REW lever 29
It is in a position where it can be engaged with 8a and 29a. The FF lever 28 and the REW lever 29 are used to command fast forwarding and rewinding of the tape as explained in FIG. FF and REW in the play state are performed in the case of so-called inter-track detection, which detects the inter-track intervals on the tape and locates the beginning.

When the REW lever 29 is pressed in the play state, the REW lever 29 is pressed as shown in FIG.
is the engaging end 32 of the second arm 32 via the pin 31
b and the hook part 29a is the 14th arm 1.
It is locked by engaging with the pin 101a of 01. The second arm 32 is connected to the first cam 33 (the 26th
Since the FF lever 28 is attached to a pin 34 fixed to the FF lever 28 (as shown in the figure), the first cam 33 is rotated as shown by the arrow using the pin 30 of the FF lever 28 as a fulcrum, and the first cam 33 is moved to the position shown by the broken line in FIG. The cam surface of the first cam 33 has a head stand 27 (first
The pin 74 for driving the roller arm 98a, 98b (shown in the figure 20a) is engaged with the pin 99a or 99b fixed to the roller arm 98a, 98b (shown in the figure 20a), and the first cam 33 is moved upward in the figure to drive the cam. These pins 74 and pins 99a or 99b are driven in the direction of the arrow. This causes the 11th arm 72 to move to the 27th arm.
As shown in the figure, the pin 74 moves the head stand 27 backward as it rotates along the elongated hole of the tenth arm 71 against the spring 73. Even in this state, the head 25 is in contact with the tape, although the contact force is weaker than during play. That is, it is a so-called queue state. In addition, in the reverse play state, since the pinch roller 26b on the reverse side is in pressure contact with the capstan 24b (as shown in Figure 20a), the pin 99b
is pushed by the cam surface of the first cam 33 to release the pressure contact between the capstan 24b and the pinch roller 26b. The second arm 32 is the pin 30 of the FF lever 28
When rotating about the fulcrum, the rotatable fifteenth arm 103 engaged with the recess is rotated counterclockwise as shown in FIG. 25. The 15th arm 103 controls a known reel stand drive mechanism (not shown) to bring it into the REW state. This allows the tape to be wound up using only the reel stand.

Further, as shown in FIG. 26, the first cam 33 engages with the inclined surface of the rotatable sixteenth arm 104 by means of a pin 33a provided at its tip. During movement, this 16th arm 104 is rotated clockwise. In the concave portion of the 16th arm 104 is a protrusion 8 of a 9th lever 83 for starting a partially toothed gear 79 that controls forward/reverse rotation switching as shown in FIG.
3a is engaged, and the rotation of the sixteenth arm 104 causes the ninth lever 83 to rotate and the protrusion 83a to rotate.
is retracted from the movement path of the pin 82 provided at the tip of the eighth lever 81. In this state, when a song gap on the tape is detected by the song gap detection mechanism and the solenoid 80 (shown in Figure 22) is excited, the eighth lever 81 is driven to rotate the fourteenth arm 101 counterclockwise ( Figure 24). As a result, it was locked at the pin 101a of the 14th arm 101.
The lock of the REW lever 29 is released and the play state returns again. Furthermore, even if the eighth lever 81 is driven, the protrusion 8 of the ninth lever 83 will not move as described above.
Since the pin 3a is retracted from the movement path of the pin 82, the ninth lever 83 is not driven, and therefore the partially toothed gear 79 that controls switching between forward and reverse rotation is not activated, so the play direction is not switched. That is,
It will be in the reverse play state before performing the REW operation. The eighth lever 81 is driven and the same operation as described above is performed not only when detecting a song interval but also when the above-mentioned sensing mechanism is activated at the end of the tape.

When the FF lever 28 is pressed in the play state, the FF lever 28 is pressed as shown in FIG.
is the engaging end 32 of the second arm 32 via the pin 30
a and the hook part 28a is the 14th arm 1.
It is locked by engaging with the pin 101a of 01. The second arm 32 rotates in the direction of the arrow about the pin 31 of the REW lever 29 as a fulcrum, thereby driving the first cam 33 via the pin 34 to the position shown by the broken line in FIG. 26. The operation after that is
It is the same as when REW. On the other hand, when the head is not in the forward position, the pin 101 of the 14th arm 101
Since a is in a position where it cannot engage with each hook part of the FF lever 28 and the REW lever 29, the FF lever 28,
The REW lever 29 is not locked, and fast forwarding or rewinding is performed while each lever is pressed.

The above-mentioned song interval detection mechanism is for running the tape at high speed in FF or REW mode while in contact with the head, and when a song gap (unrecorded zone) is detected, switching to the play mode to perform what is called cueing. , a song interval detection circuit (not shown) for detecting a song interval based on a reproduced signal from the head. By turning on this inter-track detection circuit and pressing the FF lever 28 or the REW lever 29 in the play state, high-speed playback (queue or review operation) is performed with the tape in contact with the head 25 with a weaker contact force than during play. When a song interval is detected based on the reproduced signal from the head, the solenoid 80 shown in FIG. 22 is energized and the play state is resumed. This solenoid 80 changes from high-speed playback to constant-speed playback (play) during song interval detection operation.
At the same time, as explained in FIG. 22, the direction during play is also changed.

Furthermore, by providing a song interval detection mechanism, a muting circuit (not shown) is provided for muting the reproduced sound during high-speed playback, and the muting circuit is configured to be activated except during play. ing. That is, as shown in FIG. 29, a mutating lever 106 located on the moving path of a pin 27b fixed to the tip 27a of the head stand 27 and urged toward the head stand by a spring 105, and this muting lever A mutating switch SW ₄ is located on the path of movement of the tip protrusion 106a of the head 106 and is normally closed (on) to activate the muting circuit. 27b is the mutating lever 10
The muting switch SW ₄ is opened (turned off) via the switch 6 to deactivate the muting circuit.

As is clear from the above, in the cassette deck according to the present invention, the torque of the electric motor for driving the tape reel is used as the drive source for pushing out the head stand, and there is no need for a solenoid for pushing out the head stand. It becomes smaller overall. Furthermore, in the opening operation at the time of ejection of the switch SW ₂ that supplies power to the key-off solenoid that maintains the locked state of the lock mechanism that holds the head stand in the forward position, and the switch SW ₁ that supplies power to the electric motor, Switch SW ₂ is always opened before switch SW ₁ , so that the head stand can be returned smoothly.

[Brief explanation of drawings]

1 is a schematic side view of one embodiment of the cassette loading, holding and ejecting mechanism according to the present invention; FIG. 2 is a schematic plan view thereof; FIG. 3 is a schematic front view thereof;
The figure is a plan view of the cassette holder in Figure 2.
5 to 11 are diagrams for explaining the operations shown in FIGS. 1 to 3, FIG. 12 is a schematic plan view of an embodiment of the reel stand rotation stop sensing mechanism, and FIG.
The figure is a schematic side view of an embodiment of the head stand drive mechanism.
Fig. 14 is a schematic plan view of a portion thereof, Fig. 15 is a schematic side view showing the drive section, Fig. 16 is a diagram showing the configuration around the internal gear in Fig. 13, and Fig. 17 is the drive operation of the head stand. Figure 18 is a circuit diagram of an example of the control circuit for the motor and key-off solenoid, Figure 19 is a diagram to explain the operation timing of switches SW ₁ and SW ₂ , and Figure 20a is a diagram for explaining forward/reverse rotation. Schematic plan view of one embodiment of the switching mechanism, second
0b is a diagram showing the tensioning structure of the spring in FIG. 20a, FIG. 21 is a schematic side view of a part of the mechanism shown in FIG. 20a, FIG. 22 is a schematic plan view of an embodiment of the starting mechanism, and FIG. The figure is a schematic side view of a part thereof, FIG. 24 is a schematic plan view of an embodiment of the fast forward/rewind mechanism, FIG. 25 is a diagram for explaining the rewinding operation in FIG. 24, and FIG. 26 and second
Figure 7 is a diagram for explaining the operation of each mechanism based on the rewind (or fast forward) operation, and Figure 28 is a diagram for explaining the operation of each mechanism based on the rewind (or fast forward) operation.
A diagram for explaining the operation during fast forwarding in the diagram,
FIG. 29 is a schematic plan view showing the driving section of the muting switch. Explanation of symbols of main parts 2...Cassette push lever, 3...First arm, 4...First lever, 6
...Second lever, 8...Third lever, 11...Rotating arm, 12...Fourth lever, 13...Fifth lever, 15...Cassette half, 16...Cassette holder, 18a, 18b... ...Reel unit, 19...Cassette support plate, 21...Lifting arm, 24a, 24b...Capstan, 25...
...Head, 27...Head stand, 28...FF lever, 29...REW lever, 32...Second arm,
33...first cam, 35...third arm, 38...
...Lock release lever, 39...Cassette pop-out prevention mechanism, 42a, 42b...Reel stand, 46...
4th arm, 47...5th arm, 50...internal gear, 53...motor, 55...planetary gear, 57
...Gear pig, 60...6th lever, 62...
6th arm, 64...7th lever, 66...7th
Arm, 67, 80... solenoid, 68... 8th arm, 70... 9th arm, 71... 10th arm, 72... 11th arm, 79... toothless gear,
81...8th lever, 83...9th lever, 85
...12th arm, 89...10th lever, 90...
13th arm, 91...2nd cam, 94a, 94b
... Idler gear, 96a, 96b ... Flywheel, 97 ... Third cam, 101 ... 14th arm, 103 ... 15th arm, 104 ... 16th arm.

Claims (1)

[Scope of Claims] 1. A cassette deck including an electric motor as a tape drive power source and a mechanism for advancing a head stand using the torque of the electric motor, the deck being closed to supply power to the electric motor. a locking mechanism for locking the headstand in the forward position; a locking mechanism for maintaining the locking mechanism when energized and keeping the locking mechanism locked when in the de-energized state; a key-off solenoid to be released; a second switch that is closed to supply power to and excite the key-off solenoid; and a second switch that closes the first and second switches when loading a cassette and closes the second switch first when an eject operation is performed. a switch driving means for opening and then opening said first switch. 2. The cassette deck according to claim 1, wherein electric power is supplied to the key-off solenoid and the electric motor from the same power source. 3. The driving means comprises a sliding member that engages with and interlocks with the cassette half, and the first and second switches are mechanical switches having a driving element that engages a portion of the sliding member. A cassette deck according to claim 1, characterized in that: