JPH0512761A - Torque clutch mechanism of tape recorder - Google Patents

Abstract

PURPOSE:To easily discharge static electricity and to prevent an arm from being deformed by a belt and the belt from varying in tension, etc. CONSTITUTION:Members 84, 85, and 91 which constitute the torque clutch mechanism are made of conductive materials and supported rotatably on a conductive shaft 90 on the rotatable arm 77, and the same slit 100 as the rotation track of the conductive shaft 90 is formed in a receiving plate 86 provided on the opposite side from the arm 77 and can be grounded. Further, the conductive shaft 90 is run through the slit 100 and brought into contact with the receiving plate 86 with the tension of the belt 87 to discharge the static electricity, generated at the part of felt 92, etc., through the receiving plate 86 which can be grounded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque clutch mechanism for a tape recorder. More specifically, the present invention is provided in the middle of a rotation transmission system or the like for transmitting the rotation of the motor to one of the left and right reel base gears via the FR gear (switching gear), and a torque of a set value or more is applied. The present invention relates to a torque clutch mechanism that sometimes interrupts rotation transmission.

[0002]

2. Description of the Related Art Conventionally, a torque clutch mechanism of a tape recorder is supported only by a shaft press-fitted into a molded FR arm. For example, as shown in FIG.
The FR gear 1 is attached to the shaft 102 fixed to the FR arm 101.
03, felt 104 as a friction material, pulley 105,
The coil spring 106 and the stopper 107 are sequentially fitted and rotatably mounted. The pulley 105 is biased toward the FR gear 103 side by the elastic force of the coil spring 106,
It is connected to the FR gear 103 via a felt 104 with a constant frictional force (Japanese Patent Laid-Open No. 61-13307).

Therefore, usually, the rotation of the motor transmitted to the pulley 105 is transmitted via the felt 104 to the pulley 1
Although it is transmitted from FR 05 to the FR gear 103, when the tape end is reached and the rotation on the FR gear 103 side is stopped at the time of fast return or fast feed, slippage occurs at the felt 104 portion and the rotation of the pulley 105 becomes It is provided so as not to be transmitted to the gear 103.

[0004]

However, since the torque clutch transmits the rotation between the pulley 105 and the FR gear 103 by the friction with the felt 104, static electricity is easily generated. This discharge of static electricity may cause the CPU of the control computer to malfunction, so it must be grounded to prevent it. Further, since this torque clutch is mounted on the cantilevered shaft 102 fixed to the FR arm 101, the FR arm 101 is easily deformed by the tension of the FR belt acting on the pulley 105, and the belt comes off during traveling of the belt. Is likely to have a bad effect. Further, the cantilevered shaft 102 is easily bent, and
This causes fluctuations in the tension of the R-belt, which in turn causes uneven rotation, thus reducing wow and flutter.

An object of the present invention is to provide a torque clutch mechanism of a tape recorder which can easily release static electricity and prevent deformation of the arm by the belt and fluctuation of the tension of the belt.

[0006]

In order to achieve such an object, the present invention provides a torque clutch mechanism provided in a transmission mechanism for transmitting the rotation of a motor to a reel stand via a belt. It is made of a conductive material and is rotatably supported by a conductive shaft on a rotatable arm. The same slit is formed, the conductive shaft penetrates the slit, and the slit and the conductive shaft are brought into sliding contact with each other.

[0007]

Therefore, static electricity generated in the felt portion of the torque clutch flows to the receiving plate via the conductive clutch component and shaft, and is grounded. Further, the force applied to the shaft that supports the torque clutch is distributed to the FR arm and the receiving plate and is halved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to the embodiments shown in the drawings. The present embodiment is applied to an auto-reverse recording tape recorder that employs a mode switching mechanism that switches to each operation mode by using the operation of one electrically operated solenoid and the rotational force of a motor.

This tape recorder has a rotary head mechanism 1 for rotatably supporting a head, a head chassis 2 for mounting the rotary head mechanism 1 for moving, a chassis drive mechanism for sliding the head chassis 2, and a tape running. A reverse switching mechanism that switches the direction between the forward side and the reverse side, a mode selection mechanism that switches the mode of the tape recorder, and a motor (not shown) as a drive source for these.
And switches (not shown) for mode switching and the like, and a chassis (not shown) for supporting them. This tape recorder drives the solenoid 6 to be pulsed so that the cam gear 68 meshes with the flywheel gear 7 that rotates in conjunction with the motor to rotate the head chassis 2 and the FR cam 7 as well.
4a, 74b, 74c, 74d and the movement of the trigger arm 65 are configured to control the movement of the FR arm 77 to switch the mode. The motor serving as a drive source and the flywheel gear 7 are connected by stretching a main belt 10 between a motor pulley 8 and a flywheel 9. Also, FR is coaxial with the flywheel 9.
A pulley 4 that is connected to the pulley 85 via an FR belt 87 and a pinion 5 that meshes with the play gear 55a on the forward side are provided. Further, the flywheel 3 serving as a rotation source on the reverse side is provided so as to be rotated by being brought into contact with the main belt 10 stretched around the flywheel 9 on the forward side. A pinion 3a is coaxially formed on the flywheel 3.

The rotary head mechanism 1 has a head holder 14 that holds the heads 11 and 12 and the tape guide 13 in a fixed positional relationship, a head frame 15 that rotatably supports the head holder 14, and a fan-shaped head that rotates the head holder 14. It is composed of a headgear 16, a head lever 17 for driving the headgear 16, and a reverse arm 18 for driving the head lever 17 by the movement of a reverse cam 72.

The head holder 14 includes a head block 19 to which heads (recording / reproducing magnetic head 11 and erasing head 12) and a tape guide 13 are fixed, and this head block 19
A cylindrical rotating member 20 for accommodating the
An azimuth adjusting plate 21 fixed to the back side of the head, a pinion 22 integrally formed with the rotating member 20, and a head spring 23 that applies a rotational force to the head holder 14 and fixes the head holder 14 at a predetermined position are in contact with each other. The deformed portion 24 is in contact with the deformed portion 24. The head 1 is attached to the shaft portion of the head holder 14.
Holes 26 for passing the leads 25 wired to the wirings 1 and 12 are provided, and a pinion 22 having teeth formed only in the swing range of the head holder 14 is integrally formed on the outer peripheral surface. Further, the shaft portion is provided with a deformed portion 24 including two plane portions 24a and a circumferential surface portion 24b.
The deformed portion 24 is the large-diameter bearing portion 2 of the head frame 15.
8 and the bearing portion 30 having a small diameter, the reverse side and the forward side receive the spring force of the head springs 23 respectively to constantly apply the rotational force to the head holder 14, Two plane portions 24a, 24
a is formed so as to have a non-parallel arrangement relationship.

The head frame 15 supports the head holder 14 and is attached to the head chassis 2, and is an open block having a semicircular bearing surface for housing the head holder 14. The head frame 15 has a large-diameter bearing portion 2 that accommodates the rotating member 20 of the head holder 14.
8, a semicircular groove portion 29 in which the azimuth adjusting plate 21 is rotatably accommodated, and a small-diameter bearing portion 3 that fits into a concave portion 27 between the pinion 22 and the deformed portion 24 of the shaft portion of the rotating member 20.
It has 0 and. Therefore, the head holder 14 is accommodated by being dropped from the upper side with respect to the head frame 15, and the engagement between the bearing portion 27 between the pinion 22 and the rotating member 20 and the bearing portion 30 having a small diameter and the azimuth adjusting plate 21. It is housed so as not to be disengaged in the axial direction by the engagement with the semicircular groove portion 29. Further, the open surface side of the head frame 15 is partially covered by the head mounting frame 31 of the head chassis 2, the convex portion of the head mounting frame 31, and the bearing portion 30 in a state of being mounted on the head chassis 2. The head holder 14 that is closed and accommodated is provided so as not to be separated upward. The head frame 15 is fixed to the head chassis 2 by being fixed to a head mounting frame 31 integrally formed by bending a part of the head chassis 2 with a screw or the like. In this embodiment, the small-diameter bearing portion 30 is formed of a pentagonal groove.

The head spring 23 is a rod-shaped spring whose both ends are wound, and is a head holder 1 of the head frame 15.
4 is erected on the pins 34a, 34b outside the recess for accommodating 4 and contacts the deformed portion 24 of the head holder 14 so as to traverse the deformed portion 24 and presses the head holder 14 downward in one direction. It is arranged to urge. Therefore, when the head spring 23 comes into contact with the deformed portion 24 of the head holder 14, the head spring 1
4 at one of the swing ends, it contacts the corner portion of the boundary between the flat surface portion 24a and the circumferential surface portion 24b, and further the circumferential surface portion 24
When the head spring 23 is rotated while deforming the head spring 23 and is rotated to the opposite side, the head spring 2 is again provided at the corner between the circumferential surface portion 24b and the flat surface portion 24a.
3 contacts and holds the head holder 14 against the head frame 15. For this reason, the head holder 14 is pressed against rattling in the vertical direction by the pressing force of one head spring 23, and the flat surface portion 24a and the circumferential surface portion 2 are pressed.
Rotational force is applied at the corner of the boundary with 4b. On the other hand, the head holder 14 includes a head mounting frame 31.
The azimuth adjusting plate 21 that contacts the azimuth adjusting screw 32 on the side is fixed, and the swing range of the head holder 14 is regulated by the azimuth adjusting screw 32. Therefore, the head holder 14 is constantly urged by the head spring 23 at its swinging end so that the flat surface portion 24a is always upward, that is, the head holder 14 continues to rotate, and the tip of the azimuth adjusting screw 32 is attached to the tip of the azimuth adjusting screw 32. The adjusting plate 21 is fixed in a state of abutting. Therefore, the azimuth angle of the heads 11 and 12 can be adjusted by adjusting the protrusion amount of the azimuth adjusting screw 32. In addition, the azimuth adjusting screw 32 interposes a leaf spring 33 placed on the head mounting frame 32 to interpose the head mounting frame 3 thereon.
It is attached to No. 1 and is provided so that the azimuth adjusting plate 21 does not loosen due to a collision and its position does not change.

The headgear 16 for rotating the head holder 14 is a fan-shaped gear having a stroke sufficient to swing the headholder 14 within a predetermined angle range, and meshes with the pinion 22 of the headholder 14. The headgear 16 is provided with an engagement pin 35 that engages with a U-shaped engagement groove 37 of the head lever 17.
Engages with a head lever 17 that is slidable in a direction orthogonal to the moving direction of the. Therefore, the movement of the head lever 17 causes the head gear 16 to rotate in the normal direction and the reverse direction to rotate the head holder 14 to the forward side or the reverse side.

The head lever 17 is in a direction orthogonal to the moving direction of the head chassis 2, that is, the left and right capstan shafts 53.
The head chassis 2 is slidably mounted so that it can reciprocate between a and 53b. For example, the head lever 2 is slidably attached to the head chassis 2 by providing a guide hole 38 in the head chassis 2 and providing guide claws 39a and 39b penetrating therethrough on the head lever 17 side to engage in the vertical direction. Further, a U-shaped engagement groove 37 that engages with the engagement pin 35 of the headgear 16 is formed in the head lever 17.

Further, at both ends of the head lever 17, actuating pawls 40 which engage with pinch pressure springs 49a and 49b provided on the forward and reverse side pinch arms 43a and 43b mounted on the head chassis 2, respectively.
a, 40b and the engagement pin 4 which engages with the reverse arm 18
1 and. The operating claws 40a and 40b are narrower than the distance between the left and right pinch pressure springs 49a and 49b, and are provided so as to contact only one of the pinch pressure springs 49a and 49b when the head lever 17 moves. The pinch pressure springs 49a and 49b are moved to the pinch roller 42 by the operating claws 40a and 40b.
The pinch rollers 42a and 42b are swung around the support shafts 44a and 44b by being pushed toward the caps shafts 53a and 53b so that they are brought into contact with the capstan shafts 53a and 53b. Then, the tape is pressed against the capstan shafts 53a and 53b with appropriate pressure. Similarly, the guide claws 39a and 39b are also arranged to be narrower than the space between the left and right play arms 54a and 54b, and are provided so as to contact only one of the play arms 54a and 54b when the head lever 17 moves. Has been. These guide claws 39a, 39b
Is a pinch pressure spring 49 which does not come into contact with the operating claw 40a or 40b of either one of the head levers 17.
Play arm 54a or 54 on the side of a or 49b
The play arm 54a or 54b is engaged with the head chassis 2 by pushing the head chassis 2 inward.
Regulate not to move even when released from. As a result, the play gear 55a or 55b that is not selected is the play clutch gear 56a during the play mode.
Alternatively, it is prevented from accidentally meshing with 56b.
A tension coil spring 36 is stretched between the head lever 17 and the head chassis 2, and
7 is always urged to pull back in one direction, for example, the forward side.

The pinch rollers 42a and 42b are supported by pinch arms 43a and 43b which swing about their axes. As shown in FIG. 5, the pinch arms 43a and 43b are, for example, support shafts 44a and 44 fixed to the chassis.
shaft parts 45a, 45b and the pinch roller 42 mounted on b
Arms 46a and 46b supporting a and 42b are integrally formed of plastic or the like. U-shaped arm portion 46a surrounding the pinch rollers 42a and 42b,
46b includes shafts 47a, 4 of pinch rollers 42a, 42b.
Bearing parts 48a and 48b for supporting 7b are provided on the upper and lower sides. One of the bearings 48a, 48b has a shaft 47a,
The other hole is a C-shaped hole (not shown) for holding the shaft 47a, 47b by inserting the shaft 47a, 47b from the radial direction of the pinch rollers 42a, 42b. Therefore, the pinch rollers 42a and 42b have one of the shafts with the bearing portion 4a.
After being inserted into the closed holes of 8a and 48b, it is held by being pushed into the opened holes from the side. The pinch rollers 42a and 42b are usually made of rubber or the like.

The pinch arms 43a and 43b are the chassis 5
Play arm actuating springs 50a, 50b fixed to the upper support shafts 44a, 44b so as to be swingable, one end of which is fixed to the play arms 54a, 54b and the other end of which is fixed to the pinch arms 43a, 43b. A spring force is urged so as to separate from the capstan shafts 53a and 53b. On the other hand, the pinch arms 43a and 43b are fitted with pinch pressure springs 49a and 49b, one end of which is fixed to the tip ends of the pinch arms 43a and 43b and the other end of which is relatively fixed to the pinch arms 43a and 43b. It is stopped so that the movement of the spring is blocked only in the direction in which the coil is spread. Therefore, one end of the pinch pressure springs 49a, 49b is connected to the capstan shaft 53 by the operating pawls 40a, 40b of the head lever 17.
If pressed to the side a, 53b, the pinch pressure spring 49a,
By the action of 49b, the pinch arms 43a and 43b are pressed against the capstan shafts 53a and 53b with an elastic force. The pinch rollers 42a and 42b are installed on the left and right of the chassis, and are arranged so as to correspond to the forward side capstan shaft 53a and the reverse side capstan shaft 53b, respectively. The actuating claws 40a and 40b on both ends of the head lever 17 are connected to the left and right pinch rollers 42a and
The pinch pressure springs 49a and 49b of 42b do not come into contact with the springs at the same time, but are provided so as to come into contact with either of them. Therefore, when the head chassis 2 moves when the head is set on the forward side, the pinch pressure spring 49a of the pinch roller on the forward side 42a and the operating claw 40 of the head lever 17 are moved.
a comes into contact. On the other hand, when the head is switched to the reverse side, since the head lever 17 is moving to the reverse side, that is, the left side in the drawing, the pinch pressure spring 49b of the pinch roller 42b on the reverse side and the operating claw 40b of the head lever 17 are moved. Come into contact with.

The pinch roller is shown in FIGS. 13A and 13B.
And a shaft 47 for supporting the pinch roller 42,
The shaft portion 45 and the arm portion 46 may be supported by the pinch arm 43 integrally formed of plastic. In this case, the pinch arm 43 is divided into two parts, an upper arm part 46 integrally formed with the shaft 47 and a lower arm part 46 integrally formed with the shaft part 45, and the pinch roller 4 is formed.
It is provided so as to be integrated by sandwiching 2 and fitting the unevenness. Reference numeral 49 is a pinch pressure spring.

The head chassis 2 has a head 11 with respect to the tape running in a certain direction, that is, between the left and right capstan shafts 53a and 53b, for example, by engaging a guide claw provided between the head chassis 2 and the groove. , 12 can be moved with a constant stroke in the direction of approaching or separating. The head chassis 2 has a return coil spring 5 stretched between the head chassis 2 and the head chassis 2.
1, the stop position, that is, the capstan shaft 53a, 5
The spring force is constantly urged so that the pinch rollers 42a and 42b are separated from 3b and the reel bases 57a and 57b are not rotated to return to the position where the head is separated from the tape. The return coil spring 51 is mounted on a support shaft 52 fixed on the chassis, one end of which is engaged with the chassis and the other end of which is engaged with the head chassis 2. Further, a forward side capstan shaft 53a and a reverse side capstan shaft 53b are attached to the chassis via a capstan metal or the like, and respectively include a forward side play gear 55a and a reverse side play gear 55b. Supporting play arms 54a and 54b are swingably provided. The play arms 54a and 54b engage with the head chassis 2 in the movement direction except when in the play mode, and when the head chassis 2 moves to the play position, the engagement is released and the play gears 55a and 55b.
b is the play clutch gear 56 of the reel stands 57a and 57b
It is provided so that it can rotate in a direction in which it meshes with a and 56b. On the other hand, when the head chassis 2 moves to the play position, the play arm springs 50a and 50b provided between the pinch arms 43a and 43b and the play arms 54a and 54b are compressed by the rotation of the pinch arms 43a and 43b. Therefore, the play arms 54a, 5
The spring force is further biased to 4b. Therefore, the play gear 55a or 55 that is interlocked with the pinch roller 42a or 42b that has moved with the movement of the head chassis 2.
b meshes with the play clutch gear 56a or 56b of the reel stand 57a or 57b to rotate the reel. On the other hand, the pinch roller 42b or 42a on the opposite side
Is driven by the head lever 17 and does not move, so that even when the engagement with the head chassis 2 is released, the play arm 54b or 54a is not attached to the play clutch gear 56b or 56a.
It does not move in the direction that meshes a. That is, the play arm 54a or 5 corresponding to the selected tape running direction.
Only 4b rotates and the play gear 55a or 55b moves to the play clutch gear 5 of the reel stand 57a or 57b.
6a or 56b is engaged. Reference numeral 59 is an arm for preventing the ejection of the cassette when the head chassis 2 is in a state other than the stopped state.

The head chassis 2 has an assist pin 61 which penetrates the chassis and engages with an assist cam 60 arranged on the opposite side. The assist pin 61 slides on the assist cam 60 to move the cam displacement to the head chassis 2
It is a cam follower that is transmitted to. The assist pin 61 of this embodiment is a two-step pin having a large diameter portion 61a and a small diameter portion 61b. Then, the assist cam 60 moves to the hold position 6
The small diameter portion 61b abuts on the assist cam 60 at 0d and the stop position 60e, and the large diameter portion 61a abuts on the other mode positions 60a, 60b, 60c and the intermediate paths thereof. This is to make the movement of the head chassis and the reverse switching mechanism quiet when changing from each operation mode to the stop mode, and therefore, with the assist pin 61 on the inclined surface of the assist cam 60, near the stop position 60e of the assist cam 60. This is because it is preferable to move the head chassis 2 to the upper position, that is, to control the movement of the head chassis 2 by the assist cam 60. However, since the center of the assist cam 60 is approached, the angle for inclining the assist cam 60 with respect to the diameter of the assist pin 61 becomes large. Further, when the diameter of the assist pin 61 is large, the rotation angle of the assist cam 60 with respect to the assist pin 61 is large. Therefore, it is advantageous to make the inclination for moving the distance of one assist pin gentle so as to slow down the movement of the head chassis 2 and the head lever 17 and reduce the impact. For this purpose, the diameter of the assist pin 61 may be reduced.
If you reduce the diameter of the return coil spring 51 when the distance from the center of the cam becomes long like during play,
There is a risk that the assist pin 61 will break due to the spring load. On the other hand, since the spring load is small at the stop position 60e and the hold position 60d immediately before it, even if the assist pin 61 is thin, it can sufficiently endure. Therefore,
As shown in FIG. 6B, the assist pin 61 is provided with a large diameter portion 61a in order to make it strong when the spring load in the play mode is large and to increase the angle corresponding to the slope required to roll the pin immediately before the stop position. And a small-diameter portion 61b, the stop pin 60e, the hold position 60d, and the cam surface in the vicinity thereof are axially thinner than the other portions, so that the assist pin 61 has a position corresponding to the small-diameter portion 61b. Small diameter portion 61b of the assist pin 61 formed
It is formed so as to only abut. Therefore, in the parts 60a, 60b, 60c other than the stop position 60e and the hold position 60d, the assist cam 60 is
Contacts the large diameter portion 61a of the assist pin 61. The assist pin 61 is fixed to the assist arm 62 and is substantially fixed to the head chassis 2, and is always directed toward the center of the assist cam 60 by the return coil spring 51 suspended between the head chassis 2 and the chassis. Energized to move. Assist arm 62
Is rotatably attached to the head chassis 2 with a rotating shaft 63, and is pressed in a fixed position by a strong coil spring 64 stretched between the head chassis 2 and is substantially fixed to the head chassis 2. ing. Therefore, the assist arm 62 is usually the head chassis 2
However, the cam 60 absorbs an overlock at the play position by the cam 60 (the maximum stroke before the play but the head stops at a predetermined position).

The chassis drive mechanism for driving the head chassis 2 includes an assist cam 60 rotated by a motor,
An assist pin 61 on the side of the head chassis 2 that moves on the assist cam 60, a trigger arm 65 that controls the movement of the assist cam 60, and projections 66a, 66b, 66c for fixing the assist cam 60 to each mode position,
It is composed of 66d and 66e and a trigger cam 67. The assist cam 60 is formed on one surface of the cam gear 68. The cam gear 68 uses the rotational force of the motor to drive the head chassis 2, select a mode, and perform reverse / forward switching, and includes a playback / recording toothless portion (hereinafter referred to as PLAY toothless portion) 69a. , Fast forward / rewinding toothless portion (hereinafter referred to as FF / REW toothless portion) 6
9b and a toothless portion for fast forward reproduction / rewind reproduction (hereinafter referred to as CUE
・ Revoked toothless portion 69c and stop / hold missing tooth portion (hereinafter referred to as STOP / HOLD missing tooth portion)
69d and rotates about the shaft 70 on the chassis only when meshing with the flywheel gear 7. In addition, a notch 71 is provided in the tooth portion after each toothless portion 69a, 69b, 69c, 69d to give elasticity in the radial direction so that meshing with the flywheel gear 7 is facilitated. It is provided. In the case of the present embodiment, the cam gear 68 has an assist cam 60 for driving the assist pin 61, a reverse cam 72 for restricting the reverse arm 18 and a brake cam 73 for driving the brake arm 76 on one surface of the cam gear 68 on the other surface. Is an FR cam 74a for driving the FR arm 77,
74b, 74c, 74d, projections 66a, 66b for abutting and fixing the cam gear 68 to the trigger arm 65,
A trigger cam 67 is integrally formed for slightly rotating the cam gear 68 by the movements of 66c, 66d and the trigger arm 65.

The assist cam 60, as shown in FIG.
Recording / playback position (hereinafter P
60a, which is the LAY position), is a stop position (hereinafter, referred to as the STOP position) 60e at the portion where the displacement amount is the smallest.
In the middle of them, fast forward / rewind position (FF / R
A fast forward reproduction / rewind reproduction position (hereinafter referred to as REV / CUE position) 60c and a holding position (hereinafter referred to as HOLD position) 60d are formed on the EW position 60b. The HOLD position 60d has a slightly larger cam displacement amount than the STOP position 60e.
V position 60c is larger than FF / REW position 60b by P
The cam displacement amount is smaller than that at the LAY position 60a.

The reverse cam 72 is the assist cam 6 described above.
It is formed on the outer side of 0, and a part of it is formed into an end ring which is cut out like a C shape. When the reverse pin 78 of the reverse arm 18 follows the outer surface of the assist cam 60, the reverse arm 18 is driven to move the head lever 17 to the reverse side. The movement of the head lever 17 causes the head to rotate to the reverse side via the headgear 16 and presses the pinch roller 42b on the reverse side against the capstan shaft 53b. At the end of the reverse cam 72, the holding portion 79 whose displacement is further reduced than other parts is suppressed.
And the assist pin 61 is the HOL of the assist cam 60.
The reverse pin 78 is positioned to move to the D position 60d to reduce the acceleration of the head lever 17 when shifting to the stop mode. The reverse cam 72 is switched to the opposite side until the cam gear 68 completes one rotation, that is, until the stop mode is entered after selecting whether the rotary head mechanism 1 is switched to the forward side or the reverse side at the beginning. I can't.

A brake cam 73 is provided further outside the reverse cam 72. The brake cam 73 fixes the rotation of the reel bases 57a, 57b by pressing the latch at the tip of the brake arm 76 against the forward reel gear 82a and the reverse reel gear 82b immediately before the cam gear 68 enters the stop position 69d. is there.
Brake arm 7 driven by this cam gear 68
Reference numeral 6 is a member that swings around a support shaft 80 on the chassis, and a driven protrusion 81 that is driven by the brake cam 73 of the cam gear 68.
Have. Only when the driven protrusion 81 rides on the brake cam 73, the brake arm 76 engages the latch at the tip thereof with the reel gears 82a and 82b. Although not shown, the brake arm 76 has its movement restricted between two pins on the chassis and is normally arranged so as not to mesh with any of the reel gears 82a and 82b. When riding on the cam 73, the latch portion at the tip is pressed against the reel gears 82a and 82b while bending the portion 76a engaged with the pin, and when the brake cam 73 passes, the spring portion 7 is pressed.
The elastic force of 6a is provided to urge the entire brake arm 76 toward the center of the cam gear.

Protrusions 66a, 66b, 66c, 66d, 6
6e stops the rotating cam gear 68 and fixes it in that position by contacting and cooperating with the trigger arm 65. Each protrusion 66a, 66b, 66c, 66
e is each toothless portion 69a, 69b, 69c of the cam gear 68,
Four positions are provided corresponding to each mode position so that 69d contacts the tip of the trigger arm 67 at a position where the flywheel gear 7 and the cam gear 68 are disengaged from each other. .. In addition, a trigger cam 67 which also serves as a holding projection (hereinafter referred to as a HOLD projection) 66d is provided slightly nearer to the stop projection (hereinafter referred to as a STOP projection) 66e and closer to the center side of the cam gear 68. There is. The surface of the trigger cam 67 orthogonal to the rotation direction of the cam gear 68 is for fixing to stop the rotation of the cam gear 68, and the surface inclined with respect to the rotation direction of the cam gear 68 holds the cam gear 68 when it hits. It is for slightly rotating.

The FR cam 74 has a plurality of cams 74a, 74b, 74c and 74d so as to set four positions.
It is configured by a combination of. The four positions are a rewinding position (hereinafter, referred to as REW) that meshes with the left reel gear 82, a position away from the left reel gear 82, an FF position that meshes with a fast-forward (hereinafter referred to as FF) gear, and a position apart from the FF gear. The four cams 74a, 74
b, 74c, 74d and two FR pins 83a, 83b. On the other hand, the FR arm 77 has an FR at one end.
The gear 84 and the FR pulley 85 are supported, and the FR pulley 85
The tension of the FR belt 87 that is stretched between the flywheel pulley 4 and the flywheel pulley 4 always causes the left reel gear 82b to move to the F side.
The R gear 84 is separated, that is, the left reel gear 82b.
It is urged to return to a position away from. In order to engage this FR gear 84 with the left reel gear 82b, 2
The FR pins 83a and 83b of the book are connected to the FR cams 74a and 74
It is driven by b, 74c and 74d. The FR cam has a cam 74a that creates an FF position and two neutral positions,
It consists of a cam 74b that produces a REW position and a cam 74c that produces a neutral position.
a, 74b, 74c, 74d and two FR pins 83a,
By engaging with 83b, the movement of the FR arm 77 is restricted in a short distance and in a short time, and the FF mode and the REW mode are switched.

The FR arm 77 is rotatably attached to a support shaft 88 on the chassis, and its movement is restricted by the FR cams 74a, 74b, 74c and 74d on the cam gear 68. Cam gear 68 of this FR arm 77
An engaging claw 89 that engages with the trigger arm 65 is formed at the tip of the side protruding upward. Further, as shown in FIG. 12, the lower end of the pin 90 that supports the FR gear 84 is in sliding contact with the chassis 58 and is electrically connected, as the case may be. Further, the upper end side of the pin 90 is arranged so as to pass through the slit 100 opened in the groundable receiving plate 86 provided on the opposite side of the FR arm 77. The slit 100 has an arc shape having the same curvature as the rotation locus of the pin 90 about the support shaft 88. One end of the pin 90 penetrating the slit 100 is provided so as to be in sliding contact with the receiving plate 86. On the other hand, the FR gear 84 is rotatably supported by being fitted into a bearing sleeve 91 integrally formed with the FR pulley 85 by a conductive plastic. The FR gear 84 is rotatably fitted on the bearing sleeve 91, and is pressed toward the FR pulley 85 by the coil spring 93 via the felt disk 92 forming the friction clutch. The coil spring 93 is a flange 9 fixed to the tip of the bearing sleeve 91.
4 and the FR gear 84, and is provided so as to press the FR gear 84 against the FR pulley 85 via the felt disc 92. Therefore, the FR pulley 85
When a force of a certain magnitude or more is generated between the FR gear 84 and the FR gear 84, they slip with each other and the rotation transmission relationship is interrupted. Further, the pin 90 and the FR pulley 85 are electrically connected via a conductive bearing sleeve 91. Therefore,
Static electricity generated during rotation between the FR belt 87 and the FR pulley 85 and on the felt disk 92 is grounded to the receiving plate 86 or the chassis 58 in some cases via the FR pulley 85, the bearing sleeve 91, and the pin 90. This prevents static electricity from being discharged from the control computer C
It is possible to protect the PU and the like and prevent malfunction. Furthermore, FR
Since the pulley 85 is disposed substantially at the center of the bearing sleeve 91 and is integrally formed, it is possible to reduce the bending of the FR belt 87 portion hung on the FR pulley 85.
It is possible to reduce fluctuations in tension of the R-belt 87, and thus uneven rotation, to improve deterioration of wow and flutter.

The trigger arm 65 is formed, for example, in an L shape, and its corner portion is fitted into the spindle 95 on the chassis and is provided so as to rotate about it. One end of the trigger arm 65 is engaged with the flange portion 6b of the plunger 6a of the solenoid 6, and the other end is connected to the cam gear 6
8 protrusions 66a, 66b, 66c, 66d, 66e, 6
It is provided so as to contact with 7. A pin 27 that engages with the reverse arm 18 is formed at the tip of the side of the trigger arm 65 that engages with the solenoid 6, and a tension spring 96 that is suspended between the pin 27 and the reverse arm 18 is hooked. Therefore, the movement of the trigger arm 65 is transmitted to the reverse arm 18 via the pin 27 and the tension spring 96.

The chassis drive mechanism is the assist cam 6
0, an assist pin 61, a cam gear 68 as a drive source for these, and a return coil spring 51. Further, the mode selection mechanism is the FR gear 84.
FR arm 77 and FR cams 74a, 74b for supporting the
74c and 74d, FR pins 83a and 83b, and a cam gear 68 which is a drive source for these components.

The reverse arm 18 is fitted in a support shaft 97 fixed to the chassis and is provided so as to rotate about the same. The reverse arm 18 includes a reverse pin 78 that engages with the reverse cam 72, an engagement portion 98 that engages with the engagement pin 41 of the head lever 17 arranged on the head chassis 2, and a pin 27 of the trigger arm 65. An auxiliary arm 99 to be engaged is formed.

Since the cam gear 68 is constructed as described above, the position of the flywheel gear 7 coaxial with the forward flywheel 9 connected via the main belt 10 to the motor pulley 8 fixed to the motor. When the toothless portions 49a, 49b, 49c, and 49d are moved, their meshing is released and the protrusions 66a, 66b, and 66 are released.
The c, 66d, 66e or the trigger cam 67 hits the trigger arm 65 to stop the rotation. The trigger arm 65 is projected by the operation of the solenoid 6.
a, 66b, 66c, 66d, when the assist cam 61 is urged to rotate the assist cam 60, the assist cam 60 is slightly rotated in the rotational direction, and the next tooth meshes with the flywheel gear 7 to rotate the motor. A positive rotation is given by. However, the assist pin 61 is the ST of the assist cam 60.
When located at the OP position 60e, the assist pin 61
Since the assist cam 60 does not rotate due to this, the cam gear 68 is slightly moved in the rotational direction by pushing the trigger cam 67 on the movement locus of the trigger arm 65 with the tip of the trigger arm 65. By this movement, the flywheel gear 7 and the next tooth of the cam gear 68 mesh with each other. The solenoid 6 is of a type that pulls the plunger only when it is energized.

With the above configuration, the mode switching is performed as follows.

From STOP mode to FWD / PLAY mode
Dohe FWD in FIG. 11A Reference] STOP mode FIG 9A1 and FIG 10A1]
When the PLAY mode is selected, the solenoid 6 is energized with a pulse of T ₁ second after the motor starts rotating. Since the trigger arm 65 is pulled by this pulse energization, the engagement with the protrusion 66d that is in contact with the trigger arm 65 is released, and at the same time, the trigger arm 67 is contacted and the cam gear 68 is slightly fed in the rotational direction. . This causes the flywheel gear 7 and the cam gear 68 to mesh with each other and start rotation. At the same time, the reverse arm 18 is also moved toward the outside of the reverse cam 72, but since the driving time of the trigger arm 65 is short, the reverse arm 18 returns to the original position with the movement of the trigger arm 65. Therefore, the reverse pin 78 of the reverse arm 18 goes into the inside of the reverse cam 72 and enters the forward state of moving inside the reverse cam 72 [FIG. 9D2]. Then, as the cam gear 68 rotates, the first FR pin 83a of the FR arm 77 rises to the FR cam 74c, and the FR gear 84 is slightly sent to the left reel gear 82b side. However, since the second FR pin 83b is in the free state, the FR gear 84 does not come into mesh with the left reel gear 82b [Fig. 9D.
3]. After that, the first FR pin 83a of the FR arm 77 falls from the FR cam 74c and the FR arm 77 becomes free, so that the FR belt 8 hung on the FR pulley 85.
The FR arm 77 is returned to the neutral position by the cam 74a by the tension of 7 [D4 in FIG. 9]. Further, as the rotation advances, the second FR pin 83b of the FR arm 77 is guided between the FR cam 74a and the FR cam 74b, the movement of the FR arm 77 is restricted, and the FR gear 84 is fixed in the neutral position.
Since the Y toothless portion 69a comes to the position of the flywheel gear 7, the transmission of rotation to the cam gear 68 is blocked [Fig. 9D.
Five]. At this time, the assist pin 61 moves to the assist cam 60.
PLAY position 60 slightly lower than the maximum displacement position of
Since the head chassis 2 is located at a, the head chassis 2 is in the most advanced state. Then, the tip of the trigger arm 65 and the PLAY projection 66a of the cam gear 68 come into contact with each other, and the rotation of the cam gear 68 is blocked. The cam gear 68 is a return coil spring 5 that is biased via the assist pin 61.
If the trigger arm 65 is no longer pressed by the spring force of 1, it is in a state of attempting to rotate. At this time, the head lever 17 is moved to the forward side on the right side in the drawing by the movement of the reverse arm 18 into the reverse cam 72, and the guide claw 3 on the reverse side of the head lever 17 is moved.
9b engages with the play arm 54b on the reverse side to regulate the movement thereof, and the play gear 55b on the reverse side is provided so as not to mesh with the play clutch gear 56b. Further, the reverse side operation claw 40b of the head lever 17
Since it also deviates from the pinch arm 43b, the reverse side pinch pressure spring 49b is not pressed by the movement of the head chassis 2 and the tape is not pressed against the reverse side capstan shaft 53b. And
At this time, since the head chassis 2 is fed most, the play arms 54a, 5a on the forward and reverse sides are formed.
4b and the head chassis 2 are disengaged respectively, and the forward side operation pawl 40a of the head lever 17 presses the pinch pressure spring 49a so that the pinch roller 42a is pressed against the capstan shaft 53a and the play arm operates. The play arm 54a is rotated to the play clutch gear 56a side via the spring 50a [Fig. 10D5]. As a result, the play gear 55a meshes with the play clutch gear 56a to rotate the reel while the forward side pinch roller 42a presses the tape against the capstan shaft 53a and runs.
It becomes AY mode [Fig. 9D5].

From STOP mode to RVS / PLAY mode
[Refer to FIG. 11A ] When the RVS / PLAY mode is selected in the STOP mode [FIG. 9A1], after the motor starts rotating as shown in FIG. 11A, the solenoid 6 is energized with a pulse of T ₂ seconds as shown by the broken line. To be done. Since the trigger arm 65 is pulled by this pulse energization, the engagement with the STOP projection 66e that is in contact with the trigger arm 65 is released, and at the same time, the trigger cam 67 is pushed to feed the cam gear 68 in the rotational direction and the flywheel gear 7 and the cam gear. 68 and mesh. At the same time, the reverse arm 18 is also moved toward the outside of the reverse cam 72, and its state is changed to the trigger arm 6
Since the driving time of No. 5 is longer than that in the FWD / PLAY mode, the reverse arm 18 wraps outside the reverse cam 72 and moves along the reverse cam 72 into the reverse state [FIGS. 9A2 and 9A3]. Then, as the cam gear 68 rotates, the first FR pin 83a of the FR arm 77 rides on the FR cam 74c and the FR gear 84 moves to the left reel gear 82b.
Slightly sent to the side. However, since the second FR pin 83b is in the free state and is pulled by the FR belt 87, the FR gear 84 does not come into mesh with the left reel gear 82b [Fig. 9A3]. After that, the first FR pin 83a is disengaged from the FR cam 74c by the rotation of the cam gear 68, so that the FR gear 84 is pulled back by the tension of the FR belt 87 and placed in the neutral state [FIG. 9A4]. Further, the rotation of the cam gear 68 progresses, the second FR pin 83b is guided between the FR cam 74a and the FR cam 74c, and the FR arm 7 is moved.
When the movement of 7 is restricted, the PLAY toothless portion 69a comes to the position of the flywheel gear 7 while the FR gear 84 is fixed at the neutral position, so that the transmission of rotation to the cam gear 68 is blocked. At this time, the reverse arm 18 and the reverse cam 72 are different from the above FWD / PLAY mode.
, The head lever 17 is moved to the reverse side, and the forward-side guide claw 39a engages with the play arm 54a to restrict the movement thereof, thereby controlling the play gear 55.
a is prevented from being caught in the play clutch gear 56a, and the forward side operation pawl 40a is displaced from the pinch pressure spring 49a to move the head chassis 2 to move the forward side pinch roller 42a to the capstan shaft 53.
I try not to push it against a. Then, the pinch pressure spring 49b is pushed by the reverse side operation pawl 40b of the head lever 17 to push the pinch roller 42b.
Is pressed against the capstan shaft 53b, the play arm 54b is rotated to engage the play gear 55b with the play clutch gear 56b, and the pinion 3 on the reverse side is engaged.
RVS PL that rotates the left reel 57b by a
It becomes the AY mode [FIG. 9A5 and FIG. 10A5].

From FWD / PLAY mode to STOP mode
[See FIG. 11B ] When the STOP mode is selected in the FWD / PLAY mode [FIG. 9D5 and FIG. 10D5], the solenoid 6 receives T ₁
The second pulse is energized. As a result, the trigger arm 65 is disengaged from the PLAY protrusion 66a that blocks the rotation of the cam gear 68, and the rotation of the cam gear 68 by the assist pin 61 is allowed. As a result, the flywheel gear 7 meshes with the cam gear 68 over the PLAY toothless portion 69a, and the cam gear 68 is rotated by the rotational force of the motor [Fig. 9D6]. At this time, the FR arm 77 is moved to the FR cam 7
The second FR pin 83b is provided between the 4a and the FR cam 74b.
Is restricted in its movement, the FR cams 74a, 7
Although FR arm 77 swings along 4b, FR gear 8
4 does not mesh with the left reel gear 82b or the FF gear 75. Further, the reverse arm 18 also moves for a moment when the trigger arm 65 is driven, but since it returns to the inside of the reverse cam 72 again, the head lever 17 is not moved. Furthermore, the head chassis 2 is the original STOP
In order to start returning to the position, the operating claw 40a of the head lever 17 that pressed the forward side pinch pressure spring 49a also retracts and the pressing of the pinch roller 42a against the capstan shaft 53a is released and the play arm 4 is released.
The urging to 3a is also released, the mesh between the play gear 55a and the play clutch gear 56a is also released, and the rotation transmission to the reel base 57a is stopped. Thereafter, when the FR arm 77 slightly swings the FR gear 84 toward the left reel gear 82b, the solenoid is again energized for a relatively long period of T ₃ seconds. As a result, the trigger arm 65 continues to be driven [Fig. 9D7], and the flywheel gear 7 is FF.
-It meshes with the next tooth of the cam gear 68 over the REW toothless portion 69b. As a result, the cam gear 68 does not stop in the FF mode and continues to rotate by the action of the assist pin 61. Then, the brake arm 73 is attached to the brake cam 73.
The driven protrusion 81 of the vehicle rides up, pushes the brake arm 76, and the latch at the tip of the brake arm 76 is pushed into
The left and right reel bases 57a and 57b are fixed by meshing with b respectively [Fig. 9D9]. At the same time, since the trigger arm 65 remains pulled, the FR arm 77 is fixed by the trigger arm 65 and fixed so as not to move to the left reel gear 82b side. Then solenoid 6
When the energization is stopped, the trigger arm 65 returns to the original position, the assist pin 61 moves to the STOP position 60e after passing the HOLD position 60d, and the cam gear 68 moves to the STOP position.
Rotate to the P mode position [Fig. 9A1 and Fig. 10A1].

From RVS / PLAY mode to STOP mode
When the STOP mode is selected in the RVS / PLAY mode [FIG. 9A5], the solenoid 6 is energized with a pulse of T ₁ second as in the FWD / PLAY mode. As a result, the trigger arm 65 operates and the cam gear 68
The engagement between the PLAY protrusion 66a that blocks the rotation of the trigger arm 65 is released to allow the cam pin 68 to rotate by the assist pin 61 [FIG. 9A6]. As a result, the flywheel gear 7 meshes with the cam gear 68 over the PLAY toothless portion 69a, and the cam gear 68 is rotated by the rotational force of the motor. At this time, FR arm 77 is F
The movement of the second FR pin 83b is restricted between the R cam 74a and the FR cam 74b.
FR arm 77 swings along 4a and 74b, but FR
The gear 84 does not mesh with the left reel gear 82. Further, since the movement of the reverse arm 18 is restricted by the reverse cam 72, the reverse arm 18 makes a constant movement along with the displacement of the reverse cam 72. Furthermore, since the head chassis 2 starts to return to the original position, the pinch pressure spring 49 on the reverse side
The operating claw 40b of the head lever 17 that pressed b is also retracted, the pressing of the pinch roller 42b against the capstan shaft 53b is released, and the urging of the play arm 54b is released, and the play clutch gear of the play gear 55b is released. 5
The engagement with 6b is also released, and the application of the rotational force to the left reel base 57b is stopped. After that, the FR arm 77 is slightly F
When the R gear 84 is swung toward the left reel gear 82b, the solenoid 6 is again energized for T ₃ seconds. As a result, the trigger arm 65 continues to be driven, and the cam gear 6
8 is over the FF / REW toothless portion 69b and is RVS /
It does not stop in REW mode but continues meshing with the next gear surface and continuing rotation [Fig. 9A7]. Then, the driven projection 81 of the brake arm 76 rides on the brake cam 73 and the latches of the brake arm 76 are engaged with the left and right reel gears 82a and 82b, respectively, and the left and right reel bases 57a and 57b are fixed [Fig. 9A9]. At the same time, since the trigger arm 65 remains pulled, the FR arm 77 is fixed by the trigger arm 65 and fixed so as not to move to the left reel gear 82b side. After that, reverse arm 1
The reverse pin 78 of No. 8 moves to the holding position (hereinafter referred to as HOLD position) 79 of the reverse cam 72, the trigger arm 65 engages with the trigger cam 67, and the assist pin 61 is held at the HOLD position 60d of the assist cam 60. [Fig. 9A10]. After that, when the energization of the solenoid 6 is released, the trigger arm 65 pulled by the solenoid 6 returns to the original position, and the cam gear 68 is rotated by the assist pin 61. And the cam gear 68
Is rotated until the trigger arm 65 and the STOP projection 60e come into contact with each other, and the HOLD of the reverse cam 72 is held.
The reverse pin 78 is dropped from the position 79 to bring the reverse arm 18 into a free state. As a result, the head lever 17 is moved to the original position, that is, the forward state by the force of the spring 36. Then, the mode shifts to the STOP mode [FIG. 9A1 and FIG. 10A1].

From STOP mode to FF mode [FIG.
When the FF mode is selected in the STOP mode [FIG. 9A1], the solenoid is energized with a pulse of T ₁ second after the rotation of the motor is started. This pulse energization pulls the trigger arm 65 and causes the flywheel gear 7 to move to the cam gear 6
8 is meshed and rotated by a motor. Since the driving time of the trigger arm 65 is short, the reverse arm 18 driven by the trigger arm 65 returns to the inside of the reverse cam 72 with the movement of the trigger arm 65 and becomes the forward state [FIG. 9D2]. After that, cam gear 6
After the state of [Fig. 9D3] is accompanied by the rotation of 8, the FR arm 77 returns to the intermediate position between the FF gear 75 and the left reel gear 82b by the tension of the FR belt 87 [Fig. 9D4]. Then, since the PLAY mode [FIG. 9D5] is passed with the rotation of the cam gear 68, the reel table 57a on the forward side rotates and the pinch roller 42a moves toward the capstan shaft 53.
However, the cam gear 68 does not stop at the PLAY position by the drive of the trigger arm 65 by energizing the solenoid 6, but continues meshing with the next tooth and rotating [FIG. 9D.
6]. When the next FF / REW toothless portion 69b is reached, the tip of the trigger arm 65 is moved to the F of the cam gear 68.
The cam gear 68 stops rotating by coming into contact with the F / REW projection 66b. At this time, the FR arm 77 has the second FR pin 83.
b is introduced between the FR cams 74a and 74b to rotate,
The FR gear 84 is meshed with the FF gear 75. As a result, the rotation of the FR gear 84 is transmitted to the right reel gear 82a via the FF gear 75, and only the reel base 57a is rotated without contacting the pinch roller 42a with the capstan shaft 53a to enter the fast forward (FF) mode [Fig. 9E5 and FIG. 10E
Five].

From STOP mode to REW mode [FIG.
1D ] When the REW mode is selected in the STOP mode [FIG. 9A1], after the motor starts rotating as shown in FIG. 11D,
The solenoid 6 is energized with a pulse of T ₁ seconds. Due to this pulse energization, the trigger arm 65 is pulled and the flywheel gear 7 and the cam gear 68 mesh with each other to start rotation. Since the driving time of the trigger arm 65 is short, the reverse arm 18 returns to the inside of the reverse cam 72 with the movement of the trigger arm 65, and becomes the forward state [D2 in FIG. 9]. Then, as the cam gear 68 rotates [Fig. 9D
The state of [3] is reached, but the solenoid is again energized for T ₄ seconds here. As a result, the trigger arm 65 moves to engage the FR arm 77, and the FF of the FR arm 77
Continues to block movement to the gear 75 side during energization [Fig. 9F
Four]. At this time, since the PLAY mode [FIG. 9D5] is entered with the rotation of the cam gear, the right reel base 57a is rotated and the pinch roller 42a is brought into contact with the capstan shaft 53a. Since the drive is long, the cam gear 65 does not stop at the PLAY position and continues to rotate while meshing with the next tooth beyond the PLAY missing tooth portion 69a. Then, since the second FR pin 83b moves along the FR cam 74b with the rotation of the cam gear 68, the FR arm 77 rotates toward the left reel gear 82b, and the FR gear 84 meshes with the left reel gear 82b. Then, when the cam gear 68 reaches the FF / REW toothless portion 69b, the trigger arm 65 causes the FF / REW protrusion 66.
The rotation of the cam gear 68 is stopped by coming into contact with b. As a result, the rotation of the FR gear 84 is transmitted to the left reel gear 82b, and only the left reel base 57b is rewound without rotating the pinch roller 42a against the capstan shaft 53a (R
The EW) mode is entered [Fig. 9F5].

From FF mode to STOP mode [FIG.
When the STOP mode is selected in the FF mode [FIG. 9E5], the solenoid 6 is energized with a relatively long pulse of T ₅ seconds as shown in FIG. 11E. As a result, the trigger arm 65 is disengaged from the FF / REW protrusion 66b to allow the cam pin 68 to rotate by the assist pin 61.
As a result, the cam gear 68 meshes with the flywheel gear 7 over the FF / REW toothless portion 69b, and the cam gear 68 is rotated by the rotational force of the motor. Cam gear 68
Even when the CUE / REV toothless portion 69c reaches the position of the flywheel gear 7 due to the rotation of the, the solenoid 6 is still energized.
By the movement of the assist pin 61 without hitting the protrusion 66c for UE / REV, the toothless portion 69 for CUE / REV is formed.
Go over c, mesh with the next tooth, and continue to rotate. F
When the first FR pin 83a of the R arm 77 is separated from the FF gear 75 by the cam 74d, the second FR pin 83b of the FR arm 77 is also pushed by the FR cam 74a as the cam gear 68 rotates, and the FR arm 7 is pushed.
7 is moved away from the FF gear 75. As a result, the FR gear 77 is disengaged from the FF gear 75, the transmission of rotation to the right reel stand 57a is cut off, and the FF mode is released. Then, as the cam gear 68 rotates, the CUE / RE
Even when the V toothless portion 69c reaches the position of the flywheel gear 7, since the solenoid 6 is still energized, the trigger arm 65 causes the CUE / REV protrusion 66c.
The assist pin 61 moves over the CUE / REV partly toothless portion 69c without hitting the ‘1,’ and meshes with the next tooth to continue further rotation without stopping at the FWD / CUE position. Thereafter, the driven protrusion 81 of the brake arm 76 rides on the brake cam 73 and drives the brake arm 76 to fix the left and right reel bases 57a and 57b [FIG. 9E].
9]. After that, when the power supply to the solenoid 6 is stopped,
The trigger arm 65 returns to the original position, and STOP / HO
The cam gear 68 disengaged from the flywheel gear 7 in the LD toothless portion 69d is rotated by the force of the assist pin 61 [Fig. 9E10], and the trigger arm 65 is moved to ST.
When contacting the OP protrusion 66e, the rotation is stopped and the STO
Transition to P mode [Fig. 9A1].

From REW mode to STOP mode [FIG.
1E ] When the stop mode is selected in the REW mode [FIG. 9F5], as in the case of switching from the FF mode to the STOP mode, the solenoid is energized with a relatively long pulse of T ₅ seconds to rotate the cam gear 68. FWD ·
After passing through the REV mode position [Fig. 9F8], FR gear 8
4 is disengaged from the left reel gear 82b, and then the brake arm 76 is operated by the brake cam 73 to fix the left and right reel bases 57a and 57b [FIG. 9F9]. afterwards,
Power supply to the solenoid 6 is stopped, and STOP / HOLD
The cam gear 68 disengaged from the flywheel gear 7 by the toothless portion 69d rotates by the force of the assist pin 61 until the trigger arm 65 hits the STOP projection 66e [Fig. 9F10], and then shifts to the STOP mode [Fig. 9A.
1].

From STOP mode to FWD, CUE mode
[Refer to FIG. 11F ] When the FWD or CUE mode is selected in the STOP mode [FIG. 9A1], a pulse of T ₁ second is supplied to the solenoid 6 after the rotation of the motor is started. Due to this pulse energization, the trigger arm 65 is pulled and the flywheel gear 7 and the cam gear 68 mesh with each other to start rotation. At the same time, the reverse arm 18 is also moved toward the outer side of the reverse cam 72, but since the driving time of the trigger arm 65 is short, the reverse arm 18 is returned to the inner side of the reverse cam 72 with the movement of the trigger arm 65 to be in the forward state [FIG. 9D2]. Then, as the cam gear 68 rotates, the state of [Fig. 9D3 and Fig. 9D4] is entered, and then the FWD / PLAY mode [Fig. 9D5] is entered, but the solenoid 6 is again energized with a pulse of T ₁ second to trigger arm. The cam gear 68 is driven to P
It does not stop at the LAY toothless portion 69a but continues to rotate by engaging with the next tooth of the cam gear 68. As a result, the FR arm 77 is switched to the FF gear 75 side, and the FR gear 84 becomes FF.
The FWD / FF mode state in which the gear 85 is engaged is temporarily entered, but since the solenoid 6 is energized again to pull the trigger arm 65, the cam gear 68 is rotated by the force of the assist pin 61 over the FF / REW projection 66b. , Meshes with the next tooth of the cam gear 68. by this,
The cam gear 68 is rotated by the rotation of the motor without stopping in the FWD / FF mode, and the assist pin 61 is fed again to the play position side while the FR gear 84 is meshed with the FF gear 85. Assist cam 60 at this time
Of the PLA is the PLA
It is smaller than that at Y, the pinch roller 42a does not contact the capstan shaft 53a, the movement of the play arm 43a is blocked, and the play gear 55a becomes the play clutch gear 56a.
To prevent the head 11 from lightly contacting the tape. Therefore, a fast-forward playback / cue (CUE) state in which the tape is run by fast-forwarding while producing a playback sound [Fig. 9E8]. The reverse arm 18 is driven each time the solenoid 6 is driven, but since it is located inside the reverse cam 72 and is not engaged with the head lever 17, it immediately returns to its original position.

From STOP to RVS / REV mode [Fig.
11F ] When the RVS / REV mode is selected in the STOP mode [FIG. 9A1], after the motor starts rotating, the solenoid is energized with a pulse of T ₂ seconds longer than that during FWD / CUE. The flywheel gear 7 and the cam gear 6 are driven by the movement of the trigger arm 65 driven by the pulse current.
8 and 8 mesh and start rotation. Reverse arm 1 at the same time
8 is also moved to the outside of the reverse cam 72, and the driving time of the trigger arm 65 is FWD · CU.
Since it is longer than that in the E mode, the reverse arm 18 wraps outside the reverse cam 72 and moves along the reverse cam 72 into the reverse state [Fig. 9A2]. Then, as the cam gear 68 rotates, the RVS / PLAY state [FIG. 9A5] is entered through the states [FIG. 9A3, FIG. 9A4], but the solenoid 6 is again energized for T ₁ second to cause the trigger arm 65 to move. Since it is driven, the cam gear 68 does not stop at the PLAY missing tooth portion 69a but continues to rotate by meshing with the next tooth [Fig. 9A6]. As a result, the FR arm 77 is switched to the FF gear 75 side and the RVS / REW mode is entered in which the FR gear 84 is meshed with the FF gear 75, but the solenoid 6 is again energized with a pulse of T ₁ second and the trigger arm 65 is turned on.
FF / REW protrusion 66b and toothless part 6
The cam gear 68 continues to rotate beyond 9b. As a result, FR gear 8 without stopping in RVS / REW mode
The head chassis 2 is sent to the PLAY position side again while the gear 4 is meshed with the FF gear 85. At this time, the displacement amount of the assist cam 60, that is, the feeding amount of the head chassis 2 is P
It is smaller than during LAY and larger than during FF / REW. Therefore, the pinch roller 42b is attached to the capstan shaft 53b.
The play gear 55b is still in a state in which the play arm 54b is engaged with the head chassis 2, so that the play gear 55b does not bite into the play clutch gear 56b.
Only the head 11 makes light contact with the tape. Therefore, R
In the VS / REW state, while the tape is running, only the head is pressed against the tape for playback, and the REV state is reached [Fig. 9B.
8].

From STOP mode to FWD / REV mode
[See FIG. 11G ] When the FWD / REV mode is selected in the STOP mode [FIG. 9A1], the solenoid 6 is energized with a pulse of T ₁ second after the motor starts rotating. By this pulse energization, the cam gear 68 meshes with the flywheel gear 7 and starts to rotate, and the drive state of the trigger arm 65 is short, so that the forward state is set [Fig. 9D2]. After that, when the state of FIG. 9D3 is passed with the rotation of the cam gear 68, the solenoid 6 is again energized for a relatively long time T ₆ seconds. As a result, the trigger arm 65 moves to move the F arm of the FR arm 77.
The movement toward the F gear 75 side is blocked [Fig. 9F4], the PLAY mode [Fig. 9D5] is passed, and the rotation is continued. P
The cam gear 68 that has passed the LAY position is moved to the FR arm 77.
Is swung toward the left reel gear 82b by the FR cam 74b and the FR gear 84 is meshed with the left reel gear 82b.
WD / REW mode is entered, but the trigger arm 65 is FF / R because the solenoid 6 is still energized.
In order to further rotate the cam gear 68 by meshing with the next tooth beyond the EW protrusion 66b and the toothless portion 69b, the FWD / R
Pass EW mode. By the subsequent rotation of the cam gear 68, the assist pin 61 is moved to the CUE / REV position 60c while the FR gear 77 is meshed with the left reel gear 82b, and the head chassis 2 is sent to the PLAY position side again. Then, rewind playback / review (REV) in which the tape is run fast by rewinding while producing a playback sound.
Switch to the mode [Fig. 9F8]. The reverse arm 18
Is continuously driven by a long energization of the solenoid 6, but it is located inside the reverse cam 72 and the head lever 17
Since it is not engaged with, it does not shift to the reverse state.

From STOP to RVS / CUE mode [Fig.
11G ] When the RVS / CUE mode is selected in the STOP mode [FIG. 9A1], the solenoid 6 is energized with a pulse of T ₂ seconds longer than that in the FWD / REV mode after the rotation of the motor is started. This pulse energization causes the cam gear 68 to start rotating and the reverse arm 18 to cause the reverse cam 7 to rotate.
Move out of 2 and enter the reverse state [Fig. 9A2]. Then, as the cam gear 68 rotates, the solenoid 6 is again energized for a relatively long time T ₆ seconds through the state shown in FIG. 9D3. As a result, the trigger arm 65 becomes the FR arm 77.
Of the FF gear 75 side [Fig. 9C4], RV
Enter the S-PLAY mode [Fig. 9A5], but solenoid 6
Since the cam gear 68 is continuously energized,
The projection 66a for PLAY and the toothless portion 6 without stopping at the Y position
Continue to rotate beyond 9a. And FR arm 7
The second FR pin 83b of No. 7 is driven by the FR cam 74b to cause the FR gear 84 to mesh with the left reel gear 82b.
Shift to FF mode. However, because the solenoid 6 is still energized, the trigger arm 65 is
The cam gear 6 is passed over the EW projection 66b and the toothless portion 69b.
Rotate 8 further to pass RVS / FF mode.
Then, the cam gear 68 is further rotated to fix the FR arm 77 while the FR gear 84 is meshed with the left reel gear 82b by the FR cam 74b to fix the head chassis 2 to the PL.
Send it toward the AY position. This CUE / REV position 6
0c displacement of assist cam 60, that is, head chassis 2
The feed amount is smaller than that at the PLAY position 60a and FF
-Large than the REW position 60b. Therefore, the pinch roller 42b does not come into contact with the capstan shaft 53b, and the play gear 55b does not bite into the play clutch gear 56b, but only the head 11 makes light contact with the tape. Therefore, while the tape is running in the RVS / FF mode, only the head is pressed against the tape for reproduction.
It will be in the UE state [Fig. 9C8].

From FWD / PLAY mode to FWD / CU
To E mode [Refer to Fig. 11H ] FWD / C in FWD / PLAY mode [Fig. 9D5]
When the UE mode is selected, the solenoid 6 is energized with a pulse of T ₁ second. The trigger arm 65 is disengaged from the PLAY protrusion 66a by this pulse energization, so that the cam gear 68 meshes with the flywheel gear 7 and starts rotating. By the rotation of the cam gear 68, the assist pin 6
Since the amount of cam displacement given to 1 gradually decreases, the head chassis 2 returns toward the STOP position, and the play arm 54a on the forward side moves to play gear 55a.
Is separated from the play clutch gear 56a and the FWD / P
Cancel the LAY state. Further, the FR arm 77 whose movement is restricted by the FR cams 74a and 74b with which the second FR pin 83b is engaged is switched to the FF gear 75 side by the rotation of the cam gear 68, and the FR gear 84 meshes with the FF gear 75.・ While entering the FF state [Fig. 9E5], the pulse of T ₁ second is again applied to the solenoid 6 to pull the trigger arm 65.
FWD / FF over the W projection 69b and the toothless portion 69b
The cam gear 68 is rotated without stopping at the position. And
While the FR gear 84 is meshed with the FF gear 85, the cam displacement amount of the assist cam 60 at the CUE / REV position 60c is applied to the head chassis 2 and is fed toward the PLAY position. The assist cam 6 at the CUE / REV position 60c
The displacement amount of 0, that is, the feed amount of the head chassis is PLA
Since it is smaller than the Y position 60a and larger than the FF / REW position 60b, only the head 11 makes light contact with the tape and the tape is run in the FF state for reproduction.
The UE state is entered [Fig. 9E8].

From RVS / PLAY mode to RVS / RE
To V mode [Refer to Fig. 11H ] RVS / R in RVS / PLAY mode [Fig. 9A5]
When the EV mode is selected, a relatively short pulse of T ₁ second is applied to the solenoid 6 and the trigger arm 65 becomes PL.
When the cam gear 68 disengages from the AY projection 66a and meshes with the flywheel gear 7 to start rotation, the head chassis 2 begins to return to the STOP position side and the PLAY state is released. Further, as the cam gear 68 rotates, the FR arm 77 is switched to the FF gear 75 side and the FR gear 84 is moved to the F side.
Although the RVS / REW mode in which the F gear 75 is meshed is entered, the solenoid 6 is again energized with a pulse for T ₁ second and the trigger arm 65 is pulled, so that the RVS / REW projection 66b and the toothless portion 69b are crossed. The cam gear 68 is rotated without stopping in the REW mode. And FR
While the gear 84 is meshed with the FF gear 75, the cam displacement amount of the assist cam 60 at the CUE / REV position 60c is given to the head chassis 2 and sent to the PLAY position side. Since the movement of the head chassis 2 is such that only the head is lightly contacted with the tape as described above, RVS.R
RVS ・ R to play while running the tape in EW state
It will be in the EV state [Fig. 9B8].

From FWD / CUE mode to STOP mode
[See FIG. 11I] When the STOP mode is selected in the FWD / CUE mode [FIG. 9E8], the solenoid 6 is energized with a relatively short pulse of T ₁ second, and the trigger arm 65 is moved to the CUE / RE.
The cam gear 68 is disengaged from the V-shaped projection 66c and is rotated [Fig. 9E9]. As the cam gear 68 rotates, the first FR pin 83a rides on the FR cam 74d and swings the FR arm 77 toward the left reel gear 82b.
Is separated from the FF gear 85 to release the FWD / CUE mode. The second FR pin 83b is held at the intermediate position by the cam 74a. After that, the brake cam 73 of the cam gear 68 drives the brake arm 76 to fix the left and right reel stands 57a and 57b [Fig. 9E9]. With the subsequent rotation of the cam gear 68, the assist pin 61 moves on the assist cam 60 toward the STOP position 60e [Fig. 9E10].
], And shifts to the STOP mode [FIG. 9A1].

From FWD / REV mode to STOP mode
[See FIG. 11I] When the STOP mode is selected in the FWD / REV mode [FIG. 9F8], the solenoid 6 is energized with a relatively short pulse of T ₁ second and the trigger arm 65 is moved to the CUE / REV mode.
The cam gear 68 starts rotating from the projection 66c [Fig. 9F9]. At this time, the FR arm 77 has the second FR pin 8
Since 3b separates from the FR cam 74b, the tension of the FR belt 87 swings the left reel gear 82b in a direction to separate the FR gear 84 from the FWD / REV mode. The FR gear 84 disengaged from the left reel gear 82b is F
The tension of the R belt 87 and the engagement of the trigger arm 65 prevent the FR arm 77 from moving to the FF gear 75 side, and the FR gear 84 is held at an intermediate position between the left reel gear 82b and the FF gear 75. Further, since the brake arm 76 is driven by the brake cam 73 of the cam gear 68, the left and right reel stands 57a and 57b are fixed [Fig. 9F9]. Then, as the cam gear 68 rotates, the assist pin 61 moves on the assist cam 60 toward the STOP position 60e [Fig. 9F10], and shifts to the STOP mode [Fig. 9A1].

From RVS / CUE mode to STOP mode
[Refer to FIG. 11J ] When the STOP mode is selected in the RVS / CUE mode [FIG. 9C8], the solenoid is energized with a relatively long pulse of T ₇ seconds, and the trigger arm 65 is moved to the CUE / REV.
The cam gear 68 starts rotating from the projection 66c [Fig. 9C9]. The rotation of the cam gear 68 causes the FR arm 77 to move the second FR pin 83b away from the restraint of the FR cam 74b, so that the tension of the FR belt 87 causes the FR arm 77 to swing in the direction in which the FR gear 84 is separated from the left reel gear 82b and the RVS / CUE mode. Is released. FR arm 77
The trigger arm 65 prevents the FR gear 84 from rotating toward the FF gear 75, and holds the FR gear 84 at an intermediate position between the left reel gear 82b and the FF gear 75. Further, as the brake cam cam gear 68 rotates, the brake cam 73
Drives the brake arm 76 to drive the left and right reel stands 57.
Fix a and 57b [Fig. 9C9]. After that, the assist pin 61 moves on the assist cam 60 toward the STOP position 60e as the cam gear 68 rotates, but the assist pin 61 moves the assist pin 61 to the HOLD position 60d.
The reverse pin 78 reaches H of the reverse cam 72 when reaching
The reverse arm 18 is moved to the OLD position 79 to move the reverse arm 18 toward the forward side, and the trigger arm 65 is brought into contact with the HOLD projection 66d that also serves as the trigger cam 67 to stop the rotation of the cam gear 68. That is, the trigger arm 65 shifts to the HOLD state where the head chassis 2 is stopped [Fig. 9C10]. After that, the power supply to the solenoid 6 is cut off and the trigger arm 65 moves to the reverse arm 1
8 returns to its original position by the force of the spring 96 stretched between the cam gear 68 and the cam pin 68, and the assist pin 61 is moved to the STOP position 60e. . Then, the head chassis 2 is returned to the STOP position, and the reverse pin 78 on the reverse cam 72 is held.
Head lever 1 dropped from D position 79 to STOP position
Return 7 to the forward side. With this, the head holder 1
4 rotates, and the head 11 shifts to the STOP mode in which the head 11 is set to the predetermined position in the forward state [FIG. 9A1, FIG.
0A1].

From RVS / REV mode to STOP mode
[See FIG. 11J)] When the STOP mode is selected in the RVS / REV mode [FIG. 9B8], the solenoid 6 is energized with a relatively long pulse of T ₇ seconds, and the trigger arm 65 is moved to CUE / RE.
The cam gear 68 starts rotating from the V projection 66c [Fig. 9B9]. With the rotation of the cam gear 68, the first
The FR pin 83a is driven by the FR cam 74d, and the FR arm 77 swings in the direction of separating the FR gear 84 from the FF gear 75 to release the RVS / REV mode. The FR arm 77 is moved to the left reel gear 82b by the trigger arm 65.
And the left reel gear 82b and F
The FR gear 84 is held at an intermediate position with respect to the F gear 75. Further, the brake cam 73 drives the brake arm 76 to fix the left and right reel stands 57a and 57b [Fig. 9B9].
After that, the assist pin 61 is rotated as the cam gear 68 rotates.
Moves on the assist cam 60 toward the STOP position 60e, and enters the HOLD state in which the assist pin 61 is stopped at the HOLD position 60d [Fig. 9B1.
0], the movement of the head chassis 2 and the head lever 17 is stopped by the assist pin 61 to reduce the acceleration when returning to the STOP position. After that, the solenoid 6 is de-energized and the trigger arm 65 returns to its original position by the force of the spring 96.
8 starts rotating again to move the assist pin 61 to the STOP position 60e and drop the reverse pin 78 on the reverse cam 72 from the HOLD position 79 to the STOP position. This shifts to STOP mode [Fig. 9A
1].

The above embodiment is one example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

[0053]

As is apparent from the above description, in the torque clutch mechanism of the tape recorder of the present invention, the torque clutch mechanism is made of a conductive material and is rotated by a conductive shaft on a rotatable arm. A belt which can be freely supported and which is provided on the side opposite to the arm and which can be grounded is formed with a slit that is the same as the rotation locus of the conductive shaft, and the conductive shaft is passed through the slit. Since the shaft of the torque clutch and the receiving plate are brought into contact with each other by the tension,
The static electricity generated in the clutch can be released through the grounding receiving plate. Moreover, in the torque clutch mechanism of the present invention, the shaft supporting the parts such as gears and pulleys constituting the clutch mechanism is supported by the FR arm and the receiving plate at both ends to make the shaft difficult to bend. Deformation due to belt tension can be prevented, and fluctuations in belt tension can be prevented to prevent deterioration of wow and flutter.

[Brief description of drawings]

FIG. 1 is a front view showing a head rotating mechanism in a reverse type tape recorder incorporating a torque clutch mechanism of the present invention in a forward state.

2 is a cross-sectional view taken along line II-II showing the relationship between the head holder and the head frame of the head rotating mechanism of FIG.

3 is a sectional view of the head rotating mechanism of FIG. 2 taken along the line III-III.

FIG. 4 is a diagram illustrating a reverse state of the head rotating mechanism in FIG.

FIG. 5 is a diagram illustrating a HOLD state of the head rotating mechanism of FIG.

FIG. 6 is a schematic view showing a structure of the reverse type recording tape recorder.

7 is a schematic diagram showing a gear and relationships such as the cam of the tape recorder shown in FIG. 6.

FIG. 8 is a view showing a relationship between an assist cam and an assist pin.
It is a clear view.

FIG. 9 is a diagram showing a positional relationship of gears, cams and the like in FIG . 7 as viewed from the opposite direction.

FIG. 10 is an exploded perspective view showing a head chassis and a rotary head mechanism of the tape recorder in a disassembled state.

FIG. 11 is a gear mechanism diagram showing a STOP mode state of the tape recorder.

FIG. 12 is a gear mechanism diagram showing a reverse selection state.

FIG. 13 : PLAY mode and REW on the reverse side
It is a gear mechanism figure showing the state in the branching point which selects mode and.

FIG. 14 is a gear mechanism diagram showing a state where the RVS / PLAY mode is selected.

FIG. 15 is a gear mechanism diagram showing an RVS / PLAY mode.

FIG. 16 is a gear mechanism diagram showing a state at a branch point where the RVS / PLAY mode is switched to the STOP mode or the RVS / REV mode.

FIG. 17 is a gear mechanism diagram showing a state where the STOP mode is selected from the RVS / PLAY mode.

FIG. 18 is a gear mechanism diagram showing a state in which the reel base is braked when the mode is changed from the RVS / PLAY mode to the STOP mode.

FIG. 19 is a gear mechanism diagram showing a holding state when shifting from the RVS / PLAY mode to the STOP mode.

FIG. 20 is a gear mechanism diagram showing an RVS / REV mode state.

FIG. 21 is a gear mechanism diagram showing a brake state at the time of shifting from the RVS / REV mode state to the STOP mode.

FIG. 22 is a gear mechanism diagram showing a holding state when shifting from the RVS / REV mode state to the STOP mode.

FIG. 23 is a gear mechanism diagram showing a state at a branch point where the FF mode is selected on the reverse side.

FIG. 24 is a gear mechanism diagram showing an RVS / CUE mode.

FIG. 25 is a gear mechanism diagram showing a braking state at the time of shifting from the RVS / CUE mode to the STOP mode.

FIG. 26 is a gear mechanism diagram showing a holding state at the time of shifting from the RVS / CUE mode to the STOP mode.

FIG. 27 is a gear mechanism diagram showing an FWD / PLAY selection state.

FIG. 28 is a gear mechanism diagram showing a state at a branch point for selecting the REW mode and the FWD / PLAY mode.

FIG. 29 is a gear mechanism diagram showing a state at a branch point for selecting the FF mode and the FWD / PLAY mode.

FIG. 30 is a gear mechanism diagram showing an FWD / PLAY state.

FIG. 31 is a gear mechanism diagram showing a transition start state from FWD / PLAY mode to STOP mode.

FIG. 32 is a gear mechanism diagram showing a further advanced state thereof.

FIG. 33 is a gear mechanism diagram showing a braking state at the time of shifting from the FWD / PLAY mode to the STOP mode.

FIG. 34 is a gear mechanism diagram showing a state immediately before switching to the STOP mode.

FIG. 35 is a gear mechanism diagram showing an FF mode state.

FIG. 36 is a gear mechanism diagram showing an FWD / CUE mode state.

FIG. 37 is a gear mechanism diagram showing a state in which a brake is applied at the time of shifting from the FWD / CUE mode to the STOP mode.

FIG. 38 is a gear mechanism diagram showing a state immediately before the STOP mode.

FIG. 39 is a gear mechanism diagram showing a state where a REW mode is selected.

FIG. 40 is a gear mechanism diagram showing a REW mode state.

FIG. 41 is a gear mechanism diagram showing an FWD / REV mode state.

FIG. 42 is a gear mechanism diagram showing a brake operating state during a transition from the FWD / REV mode to the STOP mode.

FIG. 43 is a gear mechanism diagram showing a state immediately before the STOP mode.

FIG. 44 is a plan view illustrating the movement of the head chassis in the STOP mode.

FIG. 45 is a plan view for explaining the movement of the head chassis in the RVS / PLAY mode.

FIG. 46 is a plan view explaining the movement of the head chassis in the RVS / REV mode.

FIG. 47 is a plan view illustrating the movement of the head chassis in the FWD / PLAY mode.

FIG. 48 is a plan view illustrating the movement of the head chassis in the FF mode.

FIG. 49 is a time chart showing the movement of the solenoid and the arms associated therewith when switching from the STOP mode to the FWD / PLAY or RVS / PLAY mode.

50 ] FWD / PLAY or RVS / PLAY
It is a time chart which switches to a STOP mode from a state.

FIG. 51 is a time chart of switching from STOP mode to FF mode.

FIG. 52 is a time chart of switching from STOP mode to REW mode.

FIG. 53 : From FF mode or REW mode to STO
It is a time chart which switches to P mode.

FIG. 54 is a time chart of switching from STOP mode to FWD / CUE mode or RVS / REV mode.

FIG. 55 is a time chart of switching from STOP mode to FWD / REV or RVS / CUE mode.

[ FIG. 56 ] FWD / PLAY state to FWD / CUE mode or RVS / PLAY state to RVS / RE
It is a time chart which switches to V mode.

FIG. 57 is a time chart of switching from FWD / CUE mode to STOP mode or from FWD / REV mode to STOP mode.

FIG. 58 is a time chart of switching from RVS / CUE to STOP mode or from RVS / REV to STOP mode.

FIG. 59 is a view showing an embodiment of the torque clutch mechanism according to the present invention, in which (a) is a central longitudinal sectional view and (b) is a bottom view.

FIG. 60 is a vertical sectional view showing another embodiment of the pinch arm.

61 is an exploded perspective view of the pinch arm shown in FIG . 60. FIG.

FIG. 62 is an exploded perspective view showing an example of a conventional torque clutch mechanism.

[Explanation of symbols]

 58 chassis 84 FR gear 85 pulley 86 receiving plate 90 pin (conductive shaft) 91 conductive sleeve 92 felt 100 slit

Claims (1)

Claim: What is claimed is: 1. A torque clutch mechanism provided in a transmission mechanism for transmitting the rotation of a motor to a reel stand via a belt, wherein the torque clutch mechanism is made of a conductive material and is rotated. A conductive shaft on a movable arm is rotatably supported, and a slit, which is the same as the rotation track of the conductive shaft, is formed on a groundable receiving plate provided on the opposite side of the arm and the slit. A torque clutch mechanism for a tape recorder, wherein the conductive shaft is penetrated through and the slit and the conductive shaft are slidably contacted with each other.