JPH07122926B2 - Rotating head mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for rotating a magnetic head of a tape recorder. More specifically, the present invention relates to a reproducing magnetic head or a recording / reproducing magnetic head (hereinafter referred to as both magnetic heads) in an auto-reverse type tape recorder that switches the running direction of the tape by detecting the end of the tape or switching operation. (Hereinafter, simply referred to as a head).

[0002]

2. Description of the Related Art In a reverse type tape recorder, when the end of a tape is detected or when a traveling direction switching operation is performed, it is necessary to switch the traveling direction of the tape and rotate the head each time. For this reason, conventionally, the head of the reverse type tape recorder is rotatably supported by 180 ° and mounted on the head chassis. For example,
As shown in FIG. 62 , in the conventional rotary head mechanism, a head holder 101 having a head and other accessories fixed thereto is rotatably supported by a head frame 102, and a pinion 103 is fixed to a central axis of the head holder 101. 180 by driving the pinion 103 with a fan-shaped headgear 105 that rotates in conjunction with the movement of the head lever 104 that selects the forward side or the reverse side.
° Can be rotated. The headgear 105 has the gear 1
Spring 1 for urging 05 in one direction, eg, reverse side
06, the head lever 104 is provided with a spring 107 for urging the lever 104 toward the forward side, and the head gear 105 is rotated and the head is rotated by the movement of the head lever 104 when the tape running direction is switched by mode selection. I have to. Head lever 1
The spring 107 of No. 04 and the spring 106 of headgear 105 have different strengths.
The spring 107 on the side is strengthened so that it is moved to the reverse side by the cam drive of the head lever 104 and is returned to the forward side by the force of the spring 107. Then, after switching between the reverse side and the forward side by the movement of the head lever 104, the rotational force is further applied to the head holder 101 by the force of the spring 106 of the head gear and the spring 107 of the head lever to adjust the azimuth for positioning. The screw 108 for contact is made to contact. Azimuth adjustment screw 108
Is screwed to the side of the head frame 102, and an azimuth adjusting plate 109 that is in contact with the side is attached to the side of the head holder 101. Further, a dedicated spring (not shown) for pressing the head holder 101 against the head frame 102 is provided on the shaft portion of the head holder 101 so that the head holder 101 does not rattle in the vertical direction, that is, in the width direction of the tape which is in sliding contact with the head. And the head frame 102 (Japanese Utility Model Publication No. 63-52113).

As described above, the conventional rotary head mechanism has the head holder 1 in the play mode during forward and reverse.
The azimuth adjusting plate 109 of No. 01 is used for the azimuth adjusting screw 10
The two dedicated springs 106 and 107 that give the head holder 101 a rotational force for setting a predetermined azimuth angle on the rotary head by pressing the spring 8 against the vertical direction of the head holder 101 in the head frame 102. A dedicated spring for preventing rattling is provided separately.

[0004]

However, in this conventional rotary head mechanism, since many springs are used, a spring having a strong force is required to balance the mutual forces of the springs. The switching sound becomes loud when switching the tape running direction. Further, in addition to the two springs 106 and 107 that give a rotational force to the head, a spring for pressing down the head holder 101 is required, resulting in high cost and complicated mounting work.

The present invention provides a rotary head mechanism that equalizes the head rotational force during forward play and reverse side play, and enables head rotation and vertical position determination with a single spring. With the goal.

[0006]

To achieve the above object, the present invention provides a rotary head mechanism for rotating a head by approximately 180 °, in which a large diameter and a small diameter are supported by a head frame on a head holder to which the head is attached. Two bearing portions are provided, and a deformed portion having a flat circumferential surface is formed on the shaft portion of the head holder in the middle of these bearing portions, and the one-way biasing spring of the head holder is formed in the deformed portion. And when the head is rotated to the forward and reverse positions, the spring comes into contact with the corners of the flat surface portion and the circumferential surface portion of the deformed portion.

[0007]

Therefore, when the head holder is switched to the forward side or the reverse side, the spring contacting the deformed portion of the head holder is located at the corner portion of the deformed portion and continues to give the head holder further rotational force. At the same time, the deformed portion and the spring head holder are located in the middle between the two bearing portions and work in the direction of pressing the head holder to one side. Therefore, the head holder is always set at the same position on the forward side and the reverse side.

[0008]

DETAILED 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 utilizing 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) that supports them. This tape recorder is driven by the energization of the solenoid 6 with a pulse to cause the cam gear 68 to mesh 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.
The movement of the FR arm 77 is controlled by the movements of the trigger arms 65 and 4a, 74b, 74c, 74d, and the mode is switched. 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 that serves 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 the heads (recording / reproducing magnetic head 11 and erasing head 12) and a tape guide 13 are fixed, and the 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 provided. The deformed portion 24 is in contact with the deformed portion 24. The head 1 is attached to the shaft of the head holder 14.
Holes 26 for passing the leads 25 wired in 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 composed of 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 small-diameter bearing portion 30 are formed, and 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 type 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 recess 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 engagement between the shaft portion between the pinion 22 and the rotating member 20 and the recess portion 27 of the bearing portion 30 having a small diameter and azimuth adjustment. The engagement between the plate 21 and the semicircular groove portion 29 is accommodated so as not to separate in the axial direction. The open surface side of the head frame 15 is the head chassis 2
The head mounting frame 31 of the head chassis 2 and the head mounting frame 31
The head holder 14 to be housed is provided so as not to be detached upward because the head holder 14 is partially closed by the convex portion and the bearing portion 30. 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. The small-diameter bearing portion 30 is formed of a pentagonal groove in this embodiment.

The head spring 23 is a rod-shaped spring whose both ends are wound, and is used for the head holder 1 of the head frame 15.
4 is installed 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 cross the deformed portion 24 and pushes the head holder 14 downward in one direction. It is arranged to urge. Therefore, when the head spring 23 contacts the deformed portion 24 of the head holder 14, the head spring 1
At one of the swinging ends of No. 4, it contacts the corner portion of the boundary between the flat surface portion 24a and the circumferential surface portion 24b, and 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. Therefore, the head holder 14 is prevented from rattling in the vertical direction by the pushing-down force of one head spring 23, and the flat surface portion 24a and the circumferential surface portion 2 are pressed.
Rotational force is applied to the corner portion 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 abuts 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 adjustment 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 has a leaf spring 33 mounted on the head mounting frame 32, and the head mounting frame 3
It is attached to the No. 1 and is provided so as not to loosen due to the collision of the azimuth adjusting plate 21 and the position thereof does not change.

The head gear 16 for rotating the head holder 14 is a fan-shaped gear having a stroke sufficient to swing the head holder 14 within a predetermined angle range, and meshes with the pinion 22 of the head holder 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 arranged 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 as to be capable of reciprocating between a and 53b. For example, by providing a guide hole 38 in the head chassis 2 and providing guide claws 39a, 39b penetrating the guide hole 38 in the vertical direction on the head lever 17 side, the head lever 17 is slidably attached to the head chassis 2. Further, the head lever 17 is formed with a U-shaped engagement groove 37 that engages with the engagement pin 35 of the headgear 16.

Further, at both ends of the head lever 17, operating claws 40 which engage with pinch pressure springs 49a, 49b provided on the forward side and reverse side pinch arms 43a, 43b mounted on the head chassis 2 are provided.
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 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 that does not come into contact with the operating claw 40a or 40b of 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, which is not selected, plays 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. 6 , the pinch arms 43a and 43b are, for example, support shafts 44a and 44 fixed to the chassis.
shaft parts 45a and 45b and pinch roller 42 mounted on
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 is a C-shaped hole (not shown) that is inserted through the shafts 47a and 47b in the radial direction of the pinch rollers 42a and 42b and is inserted through the hole 47b. Therefore, the pinch rollers 42a and 42b have one of the shafts with the bearing portion 4
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 formed of rubber or the like.

The pinch arms 43a and 43b are the chassis 5
Play arm actuating springs 50a and 50b, which are swingably attached to support shafts 44a and 44b fixed above, one end of which is fixed to play arms 54a and 54b and the other end of which is fixed to pinch arms 43a and 43b, are constantly operated. The 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 front side of 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 expanded. 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 at 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, and are provided so as to come into contact with either one. 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.

As shown in FIGS. 60 and 61 , the pinch roller is configured so that a shaft 47 supporting the pinch roller 42, a shaft portion 45 and an arm portion 46 are supported by a pinch arm 43 integrally formed of plastic. May be. 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 42 is sandwiched so as to fit the unevenness. It is provided to be integrated by. Reference numeral 49 is a pinch pressure spring.

The head chassis 2 has a head 11 with respect to a tape which runs 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 are provided so as to be movable 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 chassis.
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 the 3b and the reel stands 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, 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 the 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 not driven by the head lever 17 and does not move, so that even if the engagement with the head chassis 2 is released, the play arm 54b or 54a will not be moved 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 and moves, so that the cam displacement is reduced by the head chassis 2.
It is a cam follower that is transmitted to. The assist pin 61 of this embodiment is a two-stage 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 except for the assist cam 60 and the intermediate path. 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, so that the assist pin 61 is placed on the inclined surface of the assist cam 60 and 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 more advantageous to make the inclination for moving the distance of one assist pin slower 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.
The smaller the diameter of the, 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 may be broken 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 the stop position 60e, even if the assist pin 61 is thin, it can sufficiently endure. Therefore,
As shown in FIG. 8 , the assist pin 61 is provided with a large diameter portion 61a and a small diameter portion 61b 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 stop position 60e, a hold position 60d, and the cam surface in the vicinity thereof are made thinner in the axial direction than other portions, and are formed at a position corresponding to the small diameter portion 61b of the assist pin 61. The pin 61 is formed so as to contact only the small diameter portion 61b. Therefore, other parts 60a other than the stop position 60e and the hold position 60d,
In 60b and 60c, the assist cam 60 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 the return coil spring 5 suspended between the head chassis 2 and the chassis.
It is always urged by 1 to move toward the center of the assist cam 60. The assist arm 62 is rotatably attached to the head chassis 2 with a rotating shaft 63, and is pressed to a fixed position by a strong coil spring 64 stretched between the assist arm 62 and the head chassis 2. It is fixed to. Therefore,
Normally, the assist arm 62 moves integrally with the head chassis 2, but absorbs an overlock (a maximum stroke before playing but the head stops at a predetermined position) at the play position by the cam 60. .

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 protrusions 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 / rewind missing tooth (hereinafter referred to as FF / REW missing tooth) 6
9b and a toothless portion for fast-forward reproduction / rewind reproduction (hereinafter referred to as CUE
・ It is described as a toothless portion for REV) 69c and a toothless portion for stopping / holding (hereinafter referred to as a toothless portion for STOP / HOLD)
69d and rotates about the shaft 70 on the chassis only when meshing with the flywheel gear 7. 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 the 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 that drives 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 to slightly rotate the cam gear 68 by the movements of 66c and 66d and the trigger arm 65.

The assist-cam 60, as shown in FIG. 7,
Recording / playback position (hereinafter P
60a, which is the LAY position), is a stop position (hereinafter, referred to as the STOP position) 60e at a portion where the displacement amount is smallest.
In the middle of them, fast forward / rewind position (FF / R
A fast-forward reproduction / rewinding 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 rotates the head 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 suppressed to be smaller than that of other portions.
And the assist pin 61 is the HOL of the assist cam 60.
The reverse pin 78 is located so as to reduce the acceleration of the head lever 17 when shifting to the stop mode when moving to the D position 60d. At the beginning of the reverse cam 72, after selecting whether the rotary head mechanism 1 is switched to the forward side or the reverse side, 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. 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.
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. While 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.
It is provided so as to urge the entire brake arm 76 toward the center of the cam gear by the elastic force of 6a.

Protrusions 66a, 66b, 66c, 66d, 6
6e is for abutting against the trigger arm 65 to cooperate therewith to stop the rotating cam gear 68 and fix it in that position. Each protrusion 66a, 66b, 66c, 66
e is each toothless portion 69a, 69b, 69c of the cam gear 68,
Four positions are arranged 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 on the front side of the cam gear 68 slightly before the stop projection (hereinafter referred to as a STOP projection) 66e. There is. The surface of the trigger cam 67 orthogonal to the rotation direction of the cam gear 68 is for fixing 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
By the tension of the FR belt 87 that is stretched between the flywheel pulley 4 and the flywheel pulley 4
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, 83b of the book are connected to the FR cams 74a, 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. The lower end of the pin 90 supporting the FR gear 84 is in sliding contact with the chassis 5 and is electrically connected thereto. On the other hand, as shown in FIG. 59 , the FR gear 84 is fitted on the bearing sleeve 91 integrally formed with the FR pulley 85 and 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. Coil spring 9
3 is a flange 94 fixed to the tip of the bearing sleeve 91.
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, when a force of a certain magnitude or more is generated between the FR pulley 85 and the FR gear 84, the FR pulley 85 and the FR gear 84 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 is grounded to the chassis via the FR pulley 85, the bearing sleeve 91, and the pin 90. As a result, it is possible to protect the CPU and the like of the control computer from electrostatic discharge and prevent malfunction. Furthermore, FR pulley 8
Since 5 is arranged almost 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 unevenness and improve the reduction of wow and flutter.

The trigger arm 65 is formed, for example, in an L shape, and its corner portion is fitted in the spindle 95 on the chassis and is provided so as to rotate about the spindle. 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. In addition, 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 provided so as to be fitted into a support shaft 97 fixed to the chassis and rotate about the support shaft 97. 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 is coaxial with the forward-side 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 move, their engagement 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. Then, the trigger arm 65 is projected by the operation of the solenoid 6.
a, 66b, 66c, 66d, the assist pin 61 is urged to rotate the assist cam 60, so that the next tooth and the flywheel gear 7 mesh with each other 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 rotation direction by pushing the trigger cam 67 on the movement locus of the trigger arm 65 with the tip of the trigger arm 65. This movement causes the flywheel gear 7 and the next tooth of the cam gear 68 to mesh with each other. The solenoid 6 is of a type that pulls the plunger only when energized.

Since the configuration is as described above, the mode switching is performed as follows.

From STOP mode to FWD / PLAY mode
Dohe [Refer to FIG. 49 ] FWD in STOP mode [FIGS. 11 and 44 ]
When the PLAY mode is selected, after the motor starts rotating,
The solenoid 6 is energized with a pulse of T ₁ second. 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. However, 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 again. Therefore, the reverse pin 78 of the reverse arm 18 is connected to the reverse cam 7
2 enters the inside of the reverse cam 72 and enters the forward state [FIG. 27 ]. After that, cam gear 6
The first FR pin 83a of the FR arm 77 with the rotation of 8
Is raised to the FR cam 74c and the FR gear 84 is slightly sent to the left reel gear 82b side. However, the second FR pin 83
Since FR is in a free state, the FR gear 84 does not come into mesh with the left reel gear 82b [Fig. 28 ]. 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 tension of the FR belt 87 applied to the FR pulley 85 causes the FR arm 77 to return to the neutral position by the cam 74a. [FIG. 29 ]. Further, as the rotation proceeds, 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 arm 77 is restrained.
With the gear 84 fixed at the neutral position, the PLAY toothless portion 69a comes to the position of the flywheel gear 7, so that the transmission of rotation to the cam gear 68 is interrupted [FIG. 30 ]. At this time, the assist pin 61 is located at a slightly lower PLAY position 60a over the maximum displacement position of the assist cam 60, and the head chassis 2 is in the most advanced state. Then, the tip of the trigger arm 65 and the cam gear 68
And the cam gear 68 is prevented from rotating. The cam gear 68 is in a state of being rotated by the spring force of the return coil spring 51 biased via the assist pin 61 when the trigger arm 65 is no longer pressed. At this time, the head lever 17
Is moved to the forward side on the right side of the drawing by the movement of the reverse arm 18 into the reverse cam 72,
The reverse side guide claw 39b of the head lever 17 engages with the reverse side play arm 54b to regulate the movement thereof, and the reverse side play gear 55b is provided so as not to mesh with the play clutch gear 56b. Further, since the reverse side operation pawl 40b of the head lever 17 is also displaced from the pinch arm 43b, the reverse side pinch pressure spring 49b is not pressed by the movement of the head chassis 2, but the tape is pressed against the reverse side capstan shaft 53b. There is no. At this time, since the head chassis 2 is fed most, the play arms 54a, 54b on the forward side and the reverse side are disengaged from the head chassis 2, respectively, and the forward operation pawl 40a of the head lever 17 is released. The pinch pressure spring 49a is pushed to push the pinch roller 42a against the capstan shaft 53a, and the play arm 54a is pushed through the play arm actuating spring 50a.
The play clutch gear 56a side [Fig. 4
7 ]. As a result, the pinch roller 42 on the forward side
While the a presses the tape on the capstan shaft 53a to run the play gear 55a, the play gear 55a moves to the play clutch gear 56a.
The FWD / PLAY mode for rotating the meshing reel is set [Fig. 30 ].

From STOP mode to RVS / PLAY mode
When the RVS / PLAY mode is selected in the STOP mode [FIG. 11 ], after the motor starts rotating as shown in FIG. 49 , 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 to the outside of the reverse cam 72. Since the driving time of the trigger arm 65 is longer than that in the FWD / PLAY mode, the reverse arm 18 wraps around to the outside of the reverse cam 72 and the reverse cam 18 moves. The reverse state moves along 72 [Figs. 12 and 13 ]. Then, as the cam gear 68 rotates, the first FR pin 83a of the FR arm 77 moves to the FR cam 7
The FR gear 84 riding on 4c is slightly sent to the left reel gear 82b 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. 13 ]. 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. 14 ]. Further, the rotation of the cam gear 68 progresses, and the second FR pin 83b moves to the FR cam 7
When the movement of the FR arm 77 is regulated by being guided between the 4a and the FR cam 74c, the PLAY missing tooth portion 69a comes to the position of the flywheel gear 7 with the FR gear 84 fixed in the neutral position. The transmission of rotation to the cam gear 68 is cut off. At this time, the difference from the FWD / PLAY mode is that the head lever 17 is moved to the reverse side by the action of the reverse arm 18 and the reverse cam 72, and the guide claw 39a on the forward side engages with the play arm 54a. Then, the movement is restricted to prevent the play gear 55a from being caught in the play clutch gear 56a, and the forward side operation pawl 40a is moved to the pinch pressure spring 49.
The pinch roller 42a on the forward side is prevented from being pressed against the capstan shaft 53a by the movement of the head chassis 2 after being displaced from a. Then, the reverse side actuating claw 40b of the head lever 17 pushes the pinch pressure spring 49b to push the pinch roller 42b against the capstan shaft 53b, and the play arm 54b is rotated to engage the play gear 55b with the play clutch gear 56b. Also, the RVS PLAY that rotates the left reel 57b by the reverse side pinion 3a
The mode is set [FIGS. 15 and 45 ].

From FWD / PLAY mode to STOP mode
When the STOP mode is selected in the FWD / PLAY mode [FIGS. 30 and 47 ], the solenoid 6 is energized with a pulse of T ₁ second. 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 cam gear 6 by the assist pin 61 is removed.
Allow 8 rotations. 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. 31 ]. At this time, the FR arm 77 is moved to the FR cam 74.
Since the movement of the second FR pin 83b is restricted between the "a" and the FR cam 74b, the FR cams 74a, 74
Although the FR arm 77 swings along b, the FR gear 84
Does not mesh with the left reel gear 82b or the FF gear 75. Further, the reverse arm 18 also moves for a moment by the drive of the trigger arm 65, but since it returns to the inside of the reverse cam 72 again, the head lever 17 is not moved. Further, since the head chassis 2 starts to return to the original STOP position, the operating claw 4 of the head lever 17 that has pressed the forward side pinch pressure spring 49a.
0a also retreats, the pressing of the pinch roller 42a against the capstan shaft 53a is released, and the play arm 43 is released.
The urging of the play gear 55a and the play clutch gear 56a is also released, and the rotation transmission to the reel base 57a is stopped. After that, 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. 32 ], 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 but continues to rotate by the action of the assist pin 61. Then, the driven protrusion 81 of the brake arm 76 rides up on the brake cam 73, pushes the brake arm 76, and latches the tip of the brake arm 76 to the left and right reel gears 82a, 82b.
And the left and right reel bases 57a and 57b are fixed by engaging with each other [FIG. 33 ]. At the same time, since the trigger arm 65 is still in the pulled state, 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. Thereafter, when the energization of the solenoid 6 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 is stopped.
Rotate to the mode position [Figs. 11 and 44 ].

From RVS / PLAY mode to STOP mode
When the STOP mode is selected in the RVS / PLAY mode [FIG. 15 ], 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 of the trigger arm 65 with the PLAY protrusion 66a that prevents the rotation of the cam gear 68 is released to allow the rotation of the cam gear 68 by the assist pin 61 [FIG. 16 ]. 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. Further, since the head chassis 2 starts to return to its original position, the reverse side pinch pressure spring 49
The operating claw 40b of the head lever 17 that has pressed b is also retracted, the pressing of the pinch roller 42b to the capstan shaft 53b is released, and the bias to the play arm 54b is also 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 stand 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 overcame the FF / REW toothless portion 69b to RVS /
It does not stop in REW mode and continues meshing with the next gear surface and continuing rotation [Fig. 17 ]. Then, the driven protrusion 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. 18 ]. 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 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, and the trigger arm 65 engages with the trigger cam 67 to hold the assist pin 61 at the HOLD position 60d of the assist cam 60. [Fig. 19 ]. 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. Then, the cam gear 68 is rotated until the trigger arm 65 and the STOP projection 60e come into contact with each other, and the reverse pin 78 is dropped from the HOLD position 79 of the reverse cam 72 to set the reverse arm 18 in a free state. As a result, the head lever 1
7 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 [FIGS. 11 and 44 ].

From STOP mode to FF mode [FIG.
Reference] When the FF mode is selected in the STOP mode [FIG. 11 ], a pulse of T ₁ second is supplied to the solenoid 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. 27 ]. After that, cam gear 6
After the state of [Fig. 28 ] 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. 29 ]. Then, as the cam gear 68 rotates, the PLAY mode [Fig.
30 ], the forward reel table 57a rotates and the pinch roller 42a moves toward the capstan shaft 53.
Although brought into contact with a, by driving the trigger arm 65 by energizing the solenoid 6 cam gear 68 continues to meshing the next tooth rotation without stopping the PLAY position [Figure 3
1 ]. 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 rotation of the cam gear 68 is stopped by contacting 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 the fast forward (FF) mode in which only the reel base 57a is rotated without contacting the pinch roller 42a with the capstan shaft 53a is set [Fig. 35 and FIG. 4
8 ].

From STOP mode to REW mode [FIG.
When REW mode is selected in the second reference] STOP mode [11], after the start of rotation of the motor, as shown in FIG. 52, T ₁ second pulse is energized to the solenoid 6. 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.
Reverse arm 18 returns to the inside of the reverse cam 72 with movement of the trigger arm 65 again for driving time is short the trigger arm 65, the forward state [2
7 ]. Then, as the cam gear 68 rotates [Fig. 28 ].
Then, the solenoid is again energized for T ₄ seconds. As a result, the trigger arm 65 moves and engages with the FR arm 77, and keeps the FR arm 77 from moving toward the FF gear 75 side during the energization time [Fig. 39 ].
At this time, the PLAY mode [Fig.
30 ], the right reel base 57a is rotated and the pinch roller 42a is brought into contact with the capstan shaft 53a, but the trigger arm 65 is energized by energizing the solenoid 6.
Since the drive is long, the cam gear 65 does not stop at the PLAY position, passes over the PLAY missing tooth portion 69a, and continues to rotate while meshing with the next tooth. Then, as the cam gear 68 rotates, the second FR pin 83b moves along the FR cam 74b, so that the FR arm 77 rotates to the left reel gear 82b side and FR
The gear 84 is meshed with the left reel gear 82b. And
When the cam gear 68 reaches the FF / REW toothless portion 69b, the trigger arm 65 comes into contact with the FF / REW protrusion 66b to stop the rotation of the cam gear 68. 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 rotated without contacting the pinch roller 42a with the capstan shaft 53a.
W) mode is entered [Fig. 40 ].

From FF mode to STOP mode [Fig. 53
When STOP mode is selected in the reference] FF mode [35], relatively long pulse of T ₅ seconds is energized to the solenoid 6, as shown in FIG. 53. As a result, the trigger arm 65 is disengaged from the FF / REW projection 66b, and the cam pin 68 is allowed 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. Even when the CUE / REV toothless portion 69c reaches the position of the flywheel gear 7 with the rotation of the cam gear 68, the solenoid 6 is still energized.
By the movement of the assist pin 61 without hitting the E / REV projection 66c, the CUE / REV toothless portion 69c
Go over and mesh with the next tooth, and continue to rotate. FR
The first FR pin 83a of the arm 77 is moved by the cam 74d to the F pin.
When the R arm 77 is separated from the FF gear 75, the second FR pin 83b of the FR arm 77 is also pushed by the FR cam 74a with the rotation of the cam gear 68 with a little delay, and the FR arm 77 is pushed.
Is moved away from the FF gear 75. As a result, the FR gear 77 is disengaged from the FF gear 75, and the right reel stand 5
The transmission of rotation to 7a is cut off, and the FF mode is released.
Even when the CUE / REV toothless portion 69c reaches the position of the flywheel gear 7 with the rotation of the cam gear 68, the solenoid 6 is still energized, so the trigger arm 65 causes the CUE / REV protrusion 66c. CUE by the movement of the assist pin 61 without hitting the
・ Overcoming the REV missing tooth portion 69c and meshing with the next tooth, F
Continues to rotate without stopping at the WD / 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. 37 ]. After that, when the energization of the solenoid 6 is stopped, the trigger arm 65 returns to its original position, and the cam gear 68 disengaged from the flywheel gear 7 at the STOP / HOLD toothless portion 69d moves to the assist pin 61. It is rotated by force [Fig. 38 ], and the trigger arm 65 moves the STOP projection 6
When it abuts 6e, it stops rotating and shifts to STOP mode [Fig. 11 ].

From REW mode to STOP mode [FIG.
3 ] When the stop mode is selected in the REW mode [Fig. 40 ], 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. 41 ], the 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. 42 ]. 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 contacts the STOP projection 66e [Fig.
43 ], and then shifts to the STOP mode [Fig. 11 ].

From STOP mode to FWD, CUE mode
[See FIG. 54 ] When the FWD or CUE mode is selected in the STOP mode [FIG. 11 ], 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 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 inside of the reverse cam 72 with the movement of the trigger arm 65, and becomes the forward state [FIG. 27 ]. After that, the FWD / PLAY mode [Fig. 30 ] is temporarily entered after the state of [Fig. 28 and Fig. 29 ] is accompanied by the rotation of the cam gear 68, but the pulse of T ₁ second is energized to the solenoid 6 again to trigger arm. The cam gear 68 moves to P
It does not stop at the LAY toothless portion 69a but continues to rotate by meshing 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 again fed 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 the time of Y, the pinch roller 42a does not abut 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. 36 ]. 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.
54 ] When the RVS / REV mode is selected in the STOP mode [Fig. 11 ], 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 toward the outside of the reverse cam 72, and the driving time of the trigger arm 65 is FWD · CU.
Since it is longer than 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. 12 ]. Then, as the cam gear 68 rotates, the RVS / PLAY state [Fig. 15 ] is entered through the states of [Figs. 13 and 14 ], 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 meshes with the next tooth and continues to rotate [FIG. 16 ]. As a result, the FR arm 77 is switched to the FF gear 75 side to enter the RVS / REW mode 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 to trigger the trigger arm 65.
FF / REW projection 66b and toothless portion 6 due to pulling
The cam gear 68 continues to rotate beyond 9b. This allows FR gear 8 without stopping in RVS / REW mode.
The head chassis 2 is fed again to the PLAY position side while the gear 4 is meshed with the FF gear 85. The displacement amount of the assist cam 60 at this time, 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.
Since the play gear 55b remains in the state in which the play arm 54b is engaged with the head chassis 2, 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 to be in the REV state [Fig. 2
0 ].

From STOP mode to FWD / REV mode
[See FIG. 55 ] When the FWD / REV mode is selected in the STOP mode [FIG. 11 ], the solenoid 6 is energized with a pulse of T ₁ second after the rotation of the motor is started. By this pulse energization, the cam gear 68 meshes with the flywheel gear 7 and starts rotating, and the drive time of the trigger arm 65 is short, so that the forward state is established [Fig. 27 ]. After that, when the state of FIG. 28 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. 39 ], the PLAY mode [Fig. 30 ] 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 to the left reel gear 82b side by the FR cam 74b and the FR gear 84 is meshed with the left reel gear 82b F
Although the mode shifts to the WD / REW mode, since the solenoid 6 is still energized, the trigger arm 65 moves to FF / R.
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 faster by rewinding while producing a playback sound.
It shifts to the mode [Fig. 41 ]. The reverse arm 18
Is continuously driven by a long energization of the solenoid 6, but 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.
55 ] When the RVS / CUE mode is selected in the STOP mode [Fig. 11 ], the solenoid 6 is energized with a pulse of T ₂ seconds longer than that in the FWD / REV mode after the motor starts rotating. 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. 12 ]. 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. 28 . As a result, the trigger arm 65 becomes the FR arm 77.
Of the RV to the FF gear 75 side [Fig. 23 ], RV
The S ・ PLAY mode [Fig. 15 ] is entered, but the 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 spinning over 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, since the solenoid 6 continues to be energized, the trigger arm 65 is FF / R.
The cam gear 6 is passed over the EW protrusion 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 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.
The UE state is entered [Fig. 24 ].

From FWD / PLAY mode to FWD / CU
To E mode [Refer to Fig. 56 ] FWD / C in FWD / PLAY mode [Fig. 30 ]
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 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 the FF state [Fig. 35 ] is entered, the solenoid 6 is again energized with a pulse for T ₁ second and the trigger arm 65 is pulled.
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 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. 36 ].

From RVS / PLAY mode to RVS / RE
To V mode [Refer to FIG. 56 ] RVS / R in RVS / PLAY mode [Fig. 15 ]
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.
The RVS / REW mode in which the F gear 75 is engaged is entered, but 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 protrusion 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
The EV state is established [Fig. 20 ].

From FWD / CUE mode to STOP mode
[Refer to FIG. 57 ] When the STOP mode is selected in the FWD / CUE mode [FIG. 36 ], 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 rotated away from the V projection 66c [Fig. 37 ]. 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, 57b [FIG. 37 ]. Assist pin 61 with the rotation of the subsequent cam gear 68 is moved toward the assist cam 60 on the STOP position 60e [3
8 ] and the STOP mode [Fig. 11 ].

From FWD / REV mode to STOP mode
[Refer to FIG. 57 ] When the STOP mode is selected in the FWD / REV mode [FIG. 41 ], 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. 42 ]. 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 causes the left reel gear 82b to swing in a direction in which the FR gear 84 is separated, so that the FWD / REV mode is released. 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 73 is driven by the brake cam 73 of the cam gear 68, the left and right reel stands 57a and 57b are fixed [Fig.
42 ]. Then, as the cam gear 68 rotates, the assist pin 61 moves on the assist cam 60 toward the STOP position 60e [Fig. 43 ] and shifts to the STOP mode [Fig. 11 ].

From RVS / CUE mode to STOP mode
[Refer to FIG. 58 ] When the STOP mode is selected in the RVS / CUE mode [FIG. 24 ], 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. 25 ]. 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 of separating the FR gear 84 from the left reel gear 82b, and the RVS / CUE mode. Is released. FR arm 77
Is prevented from rotating toward the FF gear 75 side by the trigger arm 65, 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. 25 ]. 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 HOLD position 60d of the assist cam 60.
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 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 in which the head chassis 2 is stopped [Fig. 26 ]. Thereafter, the solenoid 6 is de-energized and the trigger arm 65 is moved to the reverse arm 18
Since the force of the spring 96 stretched between and returns to the original position, the cam gear 68 starts rotating again to move the assist pin 61 to the STOP position 60e. .
Then, the head chassis 2 is returned to the STOP position, the reverse pin 78 on the reverse cam 72 is dropped from the HOLD position 79 to the STOP position, and the head lever 17 is returned to the forward side. As a result, the head holder 14 rotates, and the head 11 shifts to the STOP mode in which the head 11 is set at the predetermined position in the forward state [FIGS. 11 and 44 ].

From RVS / REV mode to STOP mode
[See FIG. 58)] When the STOP mode is selected in the RVS / REV mode [FIG. 20 ], the solenoid 6 is energized with a relatively long pulse of T ₇ seconds, and the trigger arm 65 is moved to the CUE / RE.
The cam gear 68 starts rotating from the V projection 66c [Fig. 21 ]. 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 bases 57a and 57b [FIG. 21 ].
Then, the assist pin 61 is rotated as the cam gear 68 rotates.
Although but moved toward the assist cam 60 on the STOP position 60e, enters the HOLD state assisting pin 61 is stopped in the HOLD position 60d in the middle [2
2 ], 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, since the solenoid 6 is de-energized and the trigger arm 65 returns to its original position by the force of the spring 96, the cam gear 6
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. 1
1 ].

The above-described embodiment is an 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 rotary head mechanism of the present invention, when the head holder is switched to the forward side or the reverse side, the spring comes into contact with the corner portion of the deformed portion of the head holder to cause the head to move. Since the head holder is pressed by the head spring to one side in the middle of the two bearing parts of the head holder while continuing to apply the rotational force to the holder, the head holder can be set in advance even with one head spring. It is possible to stabilize the head characteristics because it is always urged to the specified position and is also urged so as not to rattle in the vertical direction and arranged at the same position. Moreover, since it can be carried out by one head spring, the cost can be reduced, the mounting work can be made less troublesome, and the head switching noise can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a head rotating 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 of FIG.

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

FIG. 6 is a schematic view showing the structure of a reverse type recording tape recorder to which the rotary head mechanism of the present invention is applied.

FIG. 7 is a schematic diagram showing the relationship between gears, cams, and the like of the tape recorder of FIG.

FIG. 8 is an explanatory diagram showing a relationship between an assist cam and an assist pin.

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 an exploded head chassis and a rotary head mechanism of the tape recorder.

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 in which 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 at which 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 in which 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 when 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 the RVS / CUE mode.

FIG. 25 is a gear mechanism diagram showing a brake state when the mode is changed from the RVS / CUE mode to the STOP mode.

FIG. 26 is a gear mechanism diagram showing a holding state when 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 when 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 in the middle of shifting 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 for explaining 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 for explaining the movement of the head chassis in the RVS / REV mode.

FIG. 47 is a plan view for explaining 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 solenoids 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 from a state to STOP mode.

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: STO from FF mode or REW mode
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 central longitudinal sectional view showing an example of a drive gear.

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 a schematic view showing an example of a conventional rotary head mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary head 11,12 head 14 head holder 15 head frame 23 head spring (unidirectional biasing spring) 24 deformed portion 24a flat surface portion 24b circumferential surface portion 28 large diameter bearing portion 30 small diameter bearing portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-242313 (JP, A) Actual Kaihei 1-52112 (JP, U) Actual public 51-20758 (JP, Y1) Actual public 58- 19701 (JP, Y2)

Claims (1)

[Claims] 1. A rotary head mechanism for rotating a head by approximately 180 °, wherein a head holder to which the head is attached is provided with two bearing portions of a large diameter and a small diameter that are supported by a head frame, and an intermediate portion of these bearing portions is provided. A deformed portion in which a part of the circumferential surface is a flat surface is formed on the shaft portion of the head holder, the one-way biasing spring of the head holder is exposed to the deformed portion, and the head rotates to cause forward and reverse positions. The rotary head mechanism is characterized in that the spring comes into contact with the corners of the flat surface portion and the circumferential surface portion of the deformed portion when it is in the state.