JP2599226B2 - Rotary head holding mechanism for tape recorder - 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 rotatably mounting a magnetic head of a tape recorder on a head chassis. More specifically, the present invention relates to a read-only 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 by performing a switching operation. (Hereinafter simply referred to as a head) is mounted on a head chassis in a rotatable manner.

[0002]

2. Description of the Related Art In a reverse type tape recorder, when the end of a tape is detected or when a running direction switching operation is performed, it is necessary to switch the running direction of the tape and rotate the head each time. For this reason, the head of the reverse type tape recorder is conventionally mounted on the head chassis by a rotating head holding mechanism that supports the head so as to be rotatable by 180 °. Conventional rotary head mechanisms, for example,
As shown in FIG. 62, a head holder 101 to which a head and other accessories are fixed is rotatably supported by a head frame 102, and a pinion 103 is fixed to a center shaft 104 of the head holder 101.
Is driven by a sector-shaped headgear 105 that rotates in conjunction with the movement of a head lever (not shown) for selecting the forward side and the reverse side, so that the rotation can be reversed in the range of 180 °. The azimuth adjusting screw 108 is screwed into the head frame 102 side, and an azimuth adjusting plate 109 which comes into contact with the screw is provided on the head holder 101 side. A reversing spring 107 for urging the gear 105 in one direction, for example, forward, is stretched between the headgear 105 and the pinion 103. The movement of the head lever and the function of the reversing spring 107 when the tape running direction is switched by mode selection. Headgear 105
Is rotated to rotate the head.

Here, in order to prevent the head holder 101 from slipping out in the axial direction when mounted on the head frame 102, it is necessary to form the intermediate portion between the azimuth adjusting plate 109 and the pinion 103 so as to be thin. is there.
Therefore, the center axis 104 of the head holder 101 and the pinion 103 are formed separately, and the pinion 103 and the washer 110 are fitted into the bearing hole 106 of the head frame 102 through the center axis 104 of the head holder 101, and the azimuth adjustment plate 109 is formed. The pinion 103 is fixed to the center shaft 104 such that the head frame 102 is sandwiched between the pinion 103 and the pinion 103. Key 111 on pinion 103
Are provided, while a keyway 112 is provided on the central shaft 104 side.

[0004]

However, in this conventional rotary head holding mechanism, since the head holder 101 and the pinion 103 are separate members, the mounting position of the rotary head and the mounting position of the pinion 103 are accurately determined. There are drawbacks that are difficult to match. In addition, the number of parts is increased and the number of assembling steps is increased, resulting in higher costs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary head holding mechanism which can accurately assemble a positional relationship between a head mounting position and a pinion, can easily assemble the work, and has a small number of parts.

[0006]

In order to achieve the above object, the present invention provides a head holder for holding a magnetic head, a head frame for rotatably supporting the head, and a head mounting for mounting the head frame on a head chassis. The head holder is formed integrally with a bearing portion supported by the head frame and a head rotation gear, and passes through the bearing portion of the head holder with a part of the head rotation gear having a toothless portion. The head frame has a substantially U-shaped bearing portion for supporting a bearing portion of the head holder, and the head mounting frame has a U-shaped shape when the head frame is assembled. And a projection which is in contact with the bearing of the head holder.

[0007]

Therefore, after the head holder is inserted from above the head frame and the bearing of the head holder is fitted to the bearing of the head frame, the toothless portion of the pinion of the head holder is opened to open the U-shaped bearing. If the head frame is assembled into the head mounting frame on the head chassis and mounted so that the convex portion of the head mounting frame passes over the pinion missing teeth toward the part, the convex portion of the head mounting frame The head holder comes into contact with the bearing of the head holder to restrict the radial movement of the head holder, and the step between the bearing and the pinion engages with the head frame to restrict the axial movement of the head holder.

[0008]

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

The tape recorder includes a rotary head mechanism 1 for rotatably supporting a head, a head chassis 2 on which the rotary head mechanism 1 is mounted and moving, a chassis driving mechanism for sliding the head chassis 2, and a tape running mechanism. A reverse switching mechanism for switching the direction between the forward side and the reverse side, a mode selection mechanism for switching the mode of the tape recorder, and a motor as a drive source for these (not shown)
And switches (not shown) for mode switching and the like and a chassis (not shown) for supporting them. This tape recorder rotates the cam gear 68 by engaging it with the flywheel gear 7 which rotates in conjunction with the motor by driving the solenoid 6 by pulse current supply, thereby moving the head chassis 2 and the FR cam 7.
The mode is switched by controlling the movement of the FR arm 77 by the movement of the trigger arm 65 and the movements of the trigger arm 65 and 4a, 74b, 74c, 74d. The motor serving as a driving source and the flywheel gear 7 are connected to each other by stretching a main belt 10 between a motor pulley 8 and a flywheel 9. In addition, FR is coaxial with flywheel 9.
The pulley 4 is connected to the pulley 85 via the FR belt 87, and the pinion 5 is meshed with the forward side play gear 55a. 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 a main belt 10 stretched over a flywheel 9 on the forward side. The flywheel 3 has a pinion 3a formed coaxially.

The rotary head mechanism 1 comprises a head holder 14 for holding the heads 11, 12 and the tape guide 13 in a fixed positional relationship, a head frame 15 for rotatably supporting the head 11, and a fan-shaped for rotating the head holder 14. The head gear 16 includes a head lever 17 for driving the head gear 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 head (the recording / reproducing magnetic head 11 and the erasing head 12) and the tape guide 13 are fixed, and the head block 19
Cylindrical rotating member 20 for accommodating
The azimuth adjusting plate 21 fixed to the back side of the head, a head rotating gear integrally formed with the rotating member 20, for example, a pinion 22, and the head holder 14 are fixed at a predetermined position by applying a rotating force to the head holder 14. It comprises a deformed portion 24 with which the head spring 23 comes into contact, and a bearing portion 27 supported by a substantially U-shaped bearing portion 30 of the head frame 15. A hole 26 for passing a lead 25 wired to the heads 11 and 12 is provided in a shaft portion of the head holder 14, and a pinion 22 having teeth formed only in a swing range of the head holder 14 is provided on an outer peripheral surface. It is integrally molded. Further, the shaft portion is provided with a deformed portion 24 composed of two flat portions 24a and a circumferential surface portion 24b. This deformed part 2
The head holder 4 is formed so as to be located between the large-diameter bearing portion 28 and the small-diameter bearing portion 30 of the head frame 15, and receives the spring force of the head spring 23 on the reverse side and the forward side, respectively. The two plane portions 24a are formed so as to have a non-parallel arrangement relationship in order to constantly apply a rotational force to the. Further, the pinion 22 is provided with a missing tooth portion 86. This missing tooth part 86
As shown in FIG. 1 (b), a flat surface is formed so as to be substantially tangent passing through the bearing 27. That is, the toothless portion 86 and the bearing portion 27 are provided so as to have the same height and radius in a uniaxial cross section.

The head frame 15 is for supporting the head holder 14 and attaching it to the head chassis 2, and is an open block having a semicircular bearing surface for accommodating the head holder 14. The head frame 15 has a large-diameter bearing portion 2 for accommodating the rotating member 20 of the head holder 14.
8, a semicircular groove 29 in which the azimuth adjusting plate 21 is rotatably housed, and a U-shaped small-diameter bearing portion 30 fitted in a bearing portion 27 between the pinion 22 and the deformed portion 24 of the rotating member 20. And Therefore, the head holder 14
Is accommodated by being dropped into the head frame 15 from above, and the pinion 22 and the head frame 15 are
Of the azimuth adjusting plate 21 and the semicircular groove 29 so as not to be displaced in the axial direction. The open surface side of the bearing portion 30 of the head frame 15 has a convex portion 58 provided at a position facing the bearing portion 30 of the head mounting frame 31 of the head chassis 2 in a state of being mounted on the head chassis 2. The head holder 14 is provided so as not to be separated upward. The head frame 15 is fixed to a head mounting frame 31 formed by bending a part of the head chassis 2 and integrally formed with screws, and is fixed to the head chassis 2. In the present embodiment, the small-diameter bearing portion 30 is formed as a pentagonal groove, but is not particularly limited to this shape, and may be a U-shaped or rectangular groove.

In order to take the above configuration, the assembling of the rotary head holding mechanism requires that the head holder 14 be mounted on the head frame 15.
After fitting the bearing portion 27 of the head holder 14 to the bearing portions 28 and 30 of the head frame 15 so as to fall from above, the toothless portion 86 of the pinion 22 of the head holder 14 is replaced with the open portion of the U-shaped bearing portion 30. The head frame 15 is mounted on the head mounting frame 31 on the head chassis 2 by using a screw or the like so that the protrusion 58 of the head mounting frame 31 passes over the toothless portion 86 of the pinion 22. I do. At this time, the convex portion 58 of the head mounting frame 31 is in contact with the bearing portion 27 of the head holder 14 to restrict the radial movement of the head holder 14, the step between the bearing portion 27 and the pinion 22 Engagement with the head frame 15 restricts the axial movement of the head holder 14.

The head spring 23 is a rod-shaped spring having both ends wound thereon.
The spring force is applied to the pins 34a and 34b outside the recesses for accommodating the head holder 14 so as to abut the deformed part 24 of the head holder 14 across the same and press 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 holder 1
4 at one swinging end, it abuts on the corner of the boundary between the flat surface portion 24a and the circumferential surface portion 24b, and further contacts the circumferential surface portion 24b.
b, while rotating the head spring 23 while deforming the head spring 23, and when the rotation of the head spring 23 is completed to the opposite side, the head spring 2
3 come into contact with each other and press the head holder 14 against the head frame 15. For this reason, the head holder 14 is pressed down in the vertical direction by the pressing force of one head spring 23, and the flat portion 24 a and the circumferential surface portion 2 are pressed.
At the corner of the boundary with 4b, a rotational force is applied. On the other hand, the head holder 14 has a head mounting frame 31.
The azimuth adjustment plate 21 that is in contact with the azimuth adjustment screw 32 on the side is fixed, and the swing range of the head holder 14 is regulated by the azimuth adjustment screw 32. Therefore, the head holder 14 is always urged by the head spring 23 so that the flat portion 24a is always upward at the swinging end, that is, so that the rotation of the head holder 14 is continued. The adjustment plate 21 is fixed in a contact state. Therefore, the azimuth angles of the heads 11 and 12 can be adjusted by adjusting the amount of protrusion of the azimuth adjusting screw 32. The azimuth adjusting screw 32 is interposed with a leaf spring 33 mounted on the head mounting frame 32 so as to interpose the head mounting frame 3.
1 so that the azimuth adjustment plate 21 is not loosened by the collision of the azimuth adjustment plate 21 and the position is not deviated.

The headgear 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 head gear 16 is provided with an engagement pin 35 that engages with the U-shaped engagement groove 37 of the head lever 17.
Is engaged with a head lever 17 that can slide in a direction orthogonal to the moving direction of the head. Accordingly, the movement of the head lever 17 causes the headgear 16 to rotate forward and backward, thereby rotating the head holder 14 forward or reverse.

The head lever 17 is moved 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 on the head chassis 2 so that the head chassis 2 can reciprocate between a and 53b. For example, a guide hole 38 is provided in the head chassis 2, and guide claws 39 a and 39 b penetrating therethrough and engaging in the vertical direction are provided on the head lever 17 side, so that the head lever 17 is slidably attached to the head chassis 2. The head lever 17 has 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 forward and reverse pinch arms 43a, 43b mounted on the head chassis 2 are provided.
a, 40b and engaging pin 4 for engaging with reverse arm 18
And 1. The operating claws 40a, 40b are narrower than the interval between the left and right pinch pressure springs 49a, 49b, and are provided so as to contact only one of the pinch pressure springs 49a, 49b by the movement of the head lever 17. The pinch pressure springs 49a, 49b are moved by the pinches
By pushing the pinch rollers 42a and 42b toward the capstan shafts 53a and 53b by pushing the pinch rollers 42a and 42b toward 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 interval between the left and right play arms 54a and 54b, and are provided so as to abut only one of the play arms 54a and 54b by moving the head lever 17. Have 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 one of the head levers 17.
a or 49b side play arm 54a or 54b
b, the play arm 54a or 54b is pushed into the head chassis 2
Regulations so that they will not move when released. As a result, the play gear 55a or 55b which is not selected becomes the play clutch gear 56a in the play mode.
Or, it is prevented from being erroneously engaged with 56b.
A tension coil spring 36 is stretched between the head lever 17 and the head chassis 2, and the head lever 1
7 is always urged to return in one direction, for example, to the forward side.

The pinch rollers 42a and 42b are supported by pinch arms 43a and 43b that swing about an axis. As shown in FIG. 6, the pinch arms 43a and 43b are, for example, support shafts 44a and 44 fixed to a chassis.
b and the pinch rollers 42
The arm portions 46a, 46b supporting the a, 42b are integrally formed of plastic or the like. U-shaped arms 46a surrounding the pinch rollers 42a, 42b,
46b includes shafts 47a, 4 of the pinch rollers 42a, 42b.
Bearing portions 48a and 48b for supporting 7b are provided vertically. One of the bearings 48a, 48b is a shaft 47a,
The other hole is a C-shaped hole (not shown) for holding the shafts 47a and 47b by inserting the shafts 47a and 47b from the radial direction of the pinch rollers 42a and 42b. Therefore, the pinch rollers 42a and 42b are connected to one of the shafts by the bearing 4
After being inserted into the closed holes of 8a and 48b, they are retained 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 arm 43a, 43b support shaft 44a which is fixed on the chassis <br/>, mounted swingably 44b, one end play arm 54a, the other end is fixed to 54b pinch arms 43a, A spring force is constantly urged away from the capstan shafts 53a, 53b by the play arm operating springs 50a, 50b fixed to the 43b. On the other hand, the pinch arms 43a and 43b are provided with pinch pressure springs 49a and 49b, one ends of which are fixed to the distal ends of the pinch arms 43a and 43b, and the other ends of which are relatively fixed to the pinch arms 43a and 43b. The spring is stopped only in the direction in which the coil is spread. Therefore, one end of each of the pinch pressure springs 49a, 49b is connected to the capstan shaft 53 by the operating claws 40a, 40b of the head lever 17.
a, 53b, the pinch pressure springs 49a,
The pinch arms 43a and 43b are pressed against the capstan shafts 53a and 53b with elastic force by the function of 49b. The pinch rollers 42a and 42b are installed on the left and right sides 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 operating claws 40a, 40b at both ends of the head lever 17 are connected to the left and right pinch rollers 42a,
The pinch pressure springs 49a and 49b of the 42b do not contact at the same time, but are provided so as to contact one of them. Therefore, when the head chassis 2 moves when the head is set to the forward side, when 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 contacts. On the other hand, when the head is switched to the reverse side, the pinch pressure spring 49b of the reverse side pinch roller 42b and the operating claw 40b of the head lever 17 Contact.

As shown in FIGS. 60 and 61, the pinch roller has a shaft 47 for supporting the pinch roller 42, a shaft 45 and an arm 46 supported by a pinch arm 43 integrally formed of plastic. May be. In this case, the pinch arm 43 is divided into an upper arm portion 46 integrally formed with the shaft 47 and a lower arm portion 46 integrally formed with the shaft portion 45, and the unevenness is fitted with the pinch roller 42 therebetween. Is provided so as to be integrated. Reference numeral 49 denotes a pinch pressure spring.

The head chassis 2 moves the head 11 against a 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 a groove. , 12 are provided so as to be movable with a constant stroke in the direction of approaching or separating. A return coil spring 5 stretched between the head chassis 2 and the chassis.
1, the stop position, that is, the capstan shafts 53a, 53
The spring force is constantly urged so that the pinch rollers 42a and 42b are separated from the tape base 3b and the head is released from the tape without rotating any of the reel bases 57a and 57b. 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. 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. The supporting play arms 54a and 54b are provided swingably. The play arms 54a and 54b are engaged with the head chassis 2 in the movement direction other than in the play mode, and when the head chassis 2 is shifted to the play position, the engagement is released and the play gears 55a and 55b are released.
b is the play clutch gear 56 of the reel bases 57a and 57b.
a, 56b so as to be rotatable in a direction in which they mesh. On the other hand, when the head chassis 2 moves to the play position, the play arm springs 50a, 50b provided between the pinch arms 43a, 43b and the play arms 54a, 54b are compressed by the rotation of the pinch arms 43a, 43b. Therefore, the play arms 54a, 5
4b is further biased by the spring force. Accordingly, the play gear 55a or 55g interlocking 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 base 57a or 57b to rotate the reel. On the other hand, the opposite pinch roller 42b or 42a
Is driven by the head lever 17 and does not move. Therefore, even if the engagement with the head chassis 2 is released, the play arm 54b or 54a is connected to the play clutch gear 56b or 56a by the play gear 55b or 55a.
a does not move in the direction of engagement. That is, the play arm 54a or 5a corresponding to the selected tape running direction.
4b rotates only the play gear 55a or 55b to the play clutch gear 5 of the reel base 57a or 57b.
6a or 56b. Reference numeral 59 denotes an arm for preventing the cassette from being ejected when the head chassis 2 is in a state other than the stop.

The head chassis 2 has an assist pin 61 which penetrates the chassis and engages with an assist cam 60 disposed on the opposite side. The assist pin 61 slides on the assist cam 60 and moves to displace the cam.
This is the cam follower that transmits to the cam. 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 is moved to the hold position 6
At 0d and the stop position 60e, the small-diameter portion 61b is in contact with the assist cam 60, and the other large-diameter portions 61a are in contact with the other mode positions 60a, 60b, and 60c and intermediate routes. This is near the stop position 60e of the assist cam 60 with the assist pin 61 mounted on the inclined surface of the assist cam 60 in order to make the movement of the head chassis and the reverse switching mechanism quiet when changing from each operation mode to the stop mode. This is because it is preferable to move the head chassis 2 using the assist cam 60. However, since the distance to the center of the assist cam 60 is increased, the angle for making the assist cam 60 inclined with respect to the diameter of the assist pin 61 increases. 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 increases. Therefore, it is advantageous to reduce the inclination for moving the distance of one assist pin in order to reduce the impact by slowing the movement of the head chassis 2 and the head lever 17. For this purpose, the diameter of the assist pin 61 may be reduced.
When the distance from the center of the cam increases as in the case of play, the return coil spring 51
There is a possibility that the assist pin 61 may be broken by the spring load. On the other hand, the spring load is small at the stop position 60e and the hold position 60d immediately before the stop position 60e, so that even if the assist pin 61 is thin, it can withstand sufficiently. Therefore,
As shown in FIG. 8, the assist pin 61 is connected to the large-diameter portion 61a and the small-diameter portion 61b so as to be strong when the spring load in the play mode or the like is large and to increase the angle corresponding to the slope required for rolling the pin immediately before the stop position. On the other hand, the stop position 60e, the hold position 60d and the cam surface near the stop position 60d and the hold position 60d are made thinner in the axial direction than other portions, and formed at positions corresponding to the small diameter portions 61b of the assist pins 61 to assist. The pin 61 is formed so as to contact only the small diameter portion 61b. Therefore, the other parts 60a, 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.
1 is always urged to move toward the center of the assist cam 60. The assist arm 62 is rotatably attached to the head chassis 2 with a rotation shaft 63 and is pressed to a fixed position by a strong coil spring 64 stretched between the head arm 2 and the head arm 2. It is fixed to. Therefore,
Although normal assist arm 62 moves together with the head chassis 2, so as to absorb overlock at play position by the cam 60 (although the maximum stroke play front head it stops at a predetermined position) I have.

A chassis driving mechanism for driving the head chassis 2 includes an assist cam 60 rotated by a motor,
The assist pin 61 of the head chassis 2 which moves on the assist cam 60, a trigger arm 65 for controlling the movement of the assist cam 60, and projections 66a, 66b, 66c for fixing the assist cam 60 in each mode position.
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. The cam gear 68 includes a playback / recording missing tooth portion (hereinafter referred to as a PLAY missing tooth portion) 69a. , Fast-forward rewinding missing tooth (hereinafter referred to as FF / REW missing tooth) 6
9b and a toothless portion for fast forward playback / rewind playback (hereinafter CUE)
・ REV missing tooth portion 69c and stop / hold missing tooth portion (hereinafter referred to as STOP / HOLD missing tooth portion)
69d, and rotates only when engaged with the flywheel gear 7 about the shaft 70 on the chassis. A notch 71 is provided in a tooth portion after each toothless portion 69a, 69b, 69c, 69d so that elasticity is given in the radial direction so that engagement with the flywheel gear 7 is facilitated. Is provided. In the case of the present embodiment, the cam gear 68 has an assist cam 60 for driving the assist pin 61 on one surface, a reverse cam 72 for regulating the reverse arm 18 and a brake cam 73 for driving the brake arm 76 on one surface. Is a FR cam 74a for driving the FR arm 77,
74b, 74c, 74d, projections 66a, 66b for abutting the cam gear 68 against the trigger arm 65 and fixing the same.
A trigger cam 67 for slightly rotating the cam gear 68 by the movement of the trigger arms 65 and 66c, 66d is integrally formed.

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

The reverse cam 72 is connected to the assist cam 6 described above.
0, a part of which is formed in a circular end with a cutout like a C-shape. When the reverse spin 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 in the reverse direction via the headgear 16 and the pinch roller 42b on the reverse side to be pressed against the capstan shaft 53b. At the end of the reverse cam 72, a holding portion 79 in which the displacement is suppressed much smaller than the other portions.
And the assist pin 61 is connected to the HOL of the assist cam 60.
It is provided so that the acceleration of the head lever 17 at the time of shifting to the stop mode when the reverse spin 78 is located at the time of moving to the D position 60d is reduced. After selecting whether to switch the rotary head mechanism 1 to the forward side or the reverse side at the beginning, the reverse cam 72 is switched to the opposite side until the cam gear 68 completes one rotation, that is, to enter the stop mode. Can not.

A brake cam 73 is provided further outside the reverse cam 72. The brake cam 73 presses the latch at the tip of the brake arm 76 against the forward-side reel gear 82a and the reverse-side reel gear 82b immediately before the cam gear 68 enters the stop position 69d to fix the rotation of the reel bases 57a and 57b. is there.
The brake arm 7 driven by the cam gear 68
Reference numeral 6 denotes a swinging member which swings around a support shaft 80 on the chassis. The driven protrusion 81 is driven by the brake cam 73 of the cam gear 68.
Having. Only when the driven projection 81 rides on the brake cam 73, the brake arm 76 causes the latch at the tip of the brake arm to bite into each of the reel gears 82a and 82b. Although the brake arm 76 is not shown, its movement is 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 tip latch portion is pressed against the reel gears 82 a and 82 b while bending the portion 76 a engaged with the pin, and when the brake cam 73 passes, the spring portion 7
The spring arm 6a is provided so as to urge the entire brake arm 76 toward the center of the cam gear.

Projections 66a, 66b, 66c, 66d, 6
6e is to stop the rotating cam gear 68 and fix it at that position by abutting and cooperating with the trigger arm 65. Each projection 66a, 66b, 66c, 66
"e" indicates each toothless portion 69a, 69b, 69c,
Four positions 69d are arranged corresponding to the respective mode positions so that 69d is located at the flywheel gear 7 and abuts on the tip of the trigger arm 67 at a position where the flywheel gear 7 and the cam gear 68 are disengaged. . A trigger cam 67 serving as a holding projection (hereinafter, referred to as a HOLD projection) 66d is provided slightly before the stop projection (hereinafter, referred to as a STOP projection) 66e and near the center of the cam gear 68. I have. The trigger cam 67 has a surface orthogonal to the rotation direction of the cam gear 68 for fixing the rotation of the cam gear 68, and a surface inclined with respect to the rotation direction of the cam gear 68 causes the cam gear 68 when the trigger arm 65 hits. It is for slightly rotating.

The FR cam 74 has a plurality of cams 74a, 74b, 74c, 74d so as to set four positions.
It is constituted by the combination of. The four positions are a rewind (hereinafter referred to as REW) position meshing with the left reel gear 82, a position distant from the left reel gear 82, a FF position meshing with the fast-forward (hereinafter referred to as FF) gear, and a distance 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 the FR at one end.
The gear 84 and the FR pulley 85 are supported.
Due to the tension of the FR belt 87 stretched between the left reel gear 82b and the flywheel pulley 4.
The R gear 84 is released, that is, the left reel gear 82b
It is urged to return to a position away from. To engage the FR gear 84 with the left reel gear 82b,
The FR pins 83a, 83b are connected to the FR cams 74a, 74b.
It drives by b, 74c, and 74d. The FR cam includes a cam 74a that creates an FF position and two neutral positions,
A cam 74b for creating a REW position and a cam 74c for creating a neutral position.
a, 74b, 74c, 74d and two FR pins 83a,
The movement of the FR arm 77 is restricted in a short distance and in a short time by engagement with the 83b, and switching between the FF mode and the REW mode is performed.

The FR arm 77 is rotatably mounted on a support shaft 88 on the chassis, and its movement is regulated by the FR cams 74a, 74b, 74c, 74d on the cam gear 68. The cam gear 68 of this FR arm 77
An engagement claw 89 that engages with the trigger arm 65 is formed at the tip of the side that protrudes upward. The pin 90 for supporting the FR gear 84 while its lower end is electrically connected contact chassis and sliding. On the other hand, as shown in FIG. 59, the FR gear 84 is fitted on a bearing sleeve 91 formed integrally 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 a coil spring 93 via a felt disk 92 constituting a 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 disk 92. Therefore, when a force equal to or more than a certain magnitude is generated between the FR pulley 85 and the FR gear 84, the FR pulley 85 and the FR gear 84 slip, and the rotation transmission relationship is cut off. 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, the CPU and the like of the control computer can be protected from the discharge of static electricity and malfunction can be prevented. Furthermore, FR pulley 8
5 is disposed substantially at the center of the bearing sleeve 91 and is integrally formed, so that the bending of the FR belt 87 wrapped around the FR pulley 85 can be reduced, and the tension fluctuation of the FR belt 87 and, consequently, rotation. Irregularity can be reduced and wow and flutter can be reduced.

The trigger arm 65 is formed, for example, in an L-shape, and is provided so that a corner portion thereof is fitted into a support shaft 95 on a chassis and rotates around the support shaft 95. 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
8 projections 66a, 66b, 66c, 66d, 66e, 6
7 is provided so as to abut. Further, a pin 65a that engages with the reverse arm 18 is formed at the end of the side of the trigger arm 65 that engages with the solenoid 6, and a tension spring 96 that is suspended between the trigger arm 65 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 65a and the extension spring 96.

The chassis drive mechanism is provided with an assist cam 6
0, an assist pin 61, a cam gear 68 serving as a driving source thereof, and a return coil spring 51. In addition, the mode selection mechanism includes the FR gear 84.
Arm 77 and FR cams 74a, 74b supporting
74c, 74d, FR pins 83a, 83b, and a cam gear 68 as a drive source for these pins.

The reverse arm 18 is provided so as to be fitted on a support shaft 97 fixed to the chassis and rotate about the support shaft 97. The reverse arm 18 includes a reverse spin 78 that engages with the reverse cam 72, an engagement portion 98 that engages with the engagement pin 41 of the head lever 17 disposed 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 on the same axis as the forward flywheel 9 connected via the main belt 10 to the motor pulley 8 fixed to the motor is provided. When the toothless portions 69a, 69b, 69c, 69d move, the engagement is released and the projections 66a, 66b, 66
c, 66d, 66e or the trigger cam 67 hits the trigger arm 65 and stops rotating. The operation of the solenoid 6 causes the trigger arm 65 to move the protrusion 66
a, 66b, 66c, 66d, when the motor is rotated slightly by the rotation of the assist cam 60 due to the urging of the assist pin 61, the next tooth meshes with the flywheel gear 7 to rotate the motor. Is provided. However, when the assist pin 61 is in the ST position of the assist cam 60
When the assist pin 61 is located at the OP position 60e,
Since the assist cam 60 does not rotate, the trigger gear 67 on the movement trajectory of the trigger arm 65 is pushed by the tip of the trigger arm 65 to slightly feed the cam gear 68 in the rotation direction. This movement causes the flywheel gear 7 to mesh with the next tooth of the cam gear 68. The solenoid 6 is of a type that pulls the plunger only when electricity is supplied.

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

(From the STOP mode to the FWD / PLAY mode
In the STOP mode [FIGS. 11 and 44], the FWD
When the PLAY mode is selected, after the rotation of the motor starts,
A pulse of T ₁ second is supplied to the solenoid 6. Since the trigger arm 65 is pulled by this pulse energization, the engagement with the protrusion 66d in contact with the trigger arm 65 is released, and at the same time, the cam gear 68 is contacted with the trigger cam 67 and slightly fed in the rotation direction. . As a result, the flywheel gear 7 and the cam gear 68 mesh and start rotating. 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 again with the movement of the trigger arm 65. For this reason, the reverse spin 78 of the reverse arm 18 is
2 and moves forward inside the reverse cam 72 [FIG. 27]. Then, the cam gear 6
8, the first FR pin 83a of the FR arm 77
Is lifted on the FR cam 74c and the FR gear 84 is slightly fed to the left reel gear 82b side. However, the second FR pin 83
Since b is in a free state, the FR gear 84 does not engage with the left reel gear 82b (FIG. 28). Thereafter, since the first FR pin 83a of the FR arm 77 falls from the FR cam 74c and the FR arm 77 is in a free state, the FR arm 77 returns to the neutral position by the cam 74a due to the tension of the FR belt 87 applied to the FR pulley 85. [FIG. 29]. Further, the rotation proceeds, and the second FR pin 83b of the FR arm 77 is guided between the FR cam 74a and the FR cam 74b, so that the movement of the FR arm 77 is restricted.
When the gear 84 is fixed at the neutral position, the PLAY missing tooth portion 69a comes to the position of the flywheel gear 7, and the transmission of rotation to the cam gear 68 is cut off (FIG. 30). At this time, the assist pin 61 is located at the PLAY position 60a slightly lower than 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
Of the cam gear 68 is prevented from coming into contact with the PLAY projection 66a. The cam gear 68 is in a state of rotating when the pressing of the trigger arm 65 is stopped by the spring force of the return coil spring 51 urged via the assist pin 61. At this time, the head lever 17
Is moved to the forward side on the right side in the figure by the movement of the reverse arm 18 into the reverse cam 72,
A guide claw 39b on the reverse side of the head lever 17 is engaged with the play arm 54b on the reverse side to regulate its movement, and is provided so that the play gear 55b on the reverse side does not mesh with the play clutch gear 56b. In addition, since the reverse-side operating claw 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, and the tape is pressed against the reverse-side capstan shaft 53b. There is no. At this time, since the head chassis 2 is most advanced, the engagement between the forward and reverse play arms 54a, 54b and the head chassis 2 is released, respectively, and the forward operation claw 40a of the head lever 17 is used. The pinch pressure spring 49a is pressed so that the pinch roller 42a is pressed against the capstan shaft 53a, and the play arm 54a is pressed via the play arm operating spring 50a.
Is rotated toward the play clutch gear 56a [FIG.
7]. Thereby, the pinch roller 42 on the forward side
a, while the tape is pressed against the capstan shaft 53a for running, the play gear 55a
FWD / PLAY mode in which the meshing reel is rotated [FIG. 30].

(From the STOP mode to the 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, a pulse of T ₂ seconds is applied to the solenoid 6 as shown by a broken line in FIG. Is energized. Since the trigger arm 65 is pulled by the pulse current, the engagement with the STOP projection 66e which is in contact with the trigger arm 65 is released, and at the same time, the trigger cam 67 is pushed to send the cam gear 68 in the rotating direction, and the flywheel gear 7 and the cam gear And 68.
At the same time, the reverse arm 18 is also moved toward the outside of the reverse cam 72, and the driving time of the trigger arm 65 is longer than that in the FWD / PLAY mode, so that the reverse arm 18 wraps around the reverse cam 72. A reverse state moves along 72 (FIGS. 12 and 13). Thereafter, with the rotation of the cam gear 68, the first FR pin 83a of the FR arm 77
4c, the FR gear 84 is slightly sent to the left reel gear 82b side. However, since the second FR pin 83b is in a free state and is pulled by the FR belt 87, the FR gear 84 does not engage with the left reel gear 82b (FIG. 13). Thereafter, since the first FR pin 83a is disengaged from the FR cam 74c by the rotation of the cam gear 68, the FR gear 84 is pulled back by the tension of the FR belt 87 and is placed in a neutral state (FIG. 14). Further, the rotation of the cam gear 68 advances, and the second FR pin 83b
When the movement of the FR arm 77 is regulated by being guided between the FR cam 4c 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 at the neutral position. Transmission of rotation to the cam gear 68 is cut off. At this time, the difference from the above-mentioned FWD / PLAY mode is that the head arm 17 is moved to the reverse side by the action of the reverse arm 18 and the reverse cam 72, and the forward-side guide claw 39a engages with the play arm 54a. To prevent the play gear 55a from biting into the play clutch gear 56a.
The pinch roller 42a on the forward side is not pressed against the capstan shaft 53a by the movement of the head chassis 2 shifted from the position a. Then, the pinch pressure spring 49b is pressed by the operating claw 40b on the reverse side of the head lever 17 to press 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. RVS PLAY for rotating the left reel stand 57b by the pinion 3a on the reverse side
Mode [FIGS. 15 and 45].

(From the FWD / PLAY mode to the STOP mode )
When the STOP mode is selected in the FWD / PLAY mode [FIGS. 30 and 47], a pulse of T ₁ second is supplied to the solenoid 6. As a result, the trigger arm 65 is disengaged from the PLAY projection 66a that prevents the rotation of the cam gear 68, and the cam gear 6
8 rotations are allowed. As a result, the flywheel gear 7 meshes with the cam gear 68 beyond 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
Since the movement of the second FR pin 83b is restricted between a and the FR cam 74b, the FR cams 74a and 74b
b, the FR gear 77 swings along the
Does not mesh with the left reel gear 82b or the FF gear 75. The reverse arm 18 also moves momentarily by driving the trigger arm 65, but returns to the inside of the reverse cam 72 again, so that the head lever 17 does not move. Further, since the head chassis 2 starts to return to the original STOP position, the operating claw 4 of the head lever 17 pressing the pinch pressure spring 49a on the forward side.
0a is also retracted, the pressing of the pinch roller 42a against the capstan shaft 53a is released, and the play arm 54
biasing to a well is canceled, it is canceled also meshing with the play gear 55a and Play clutch gear 56a rotation transmission to the reel base 57a is stopped. Thereafter, when the FR arm 77 is swung toward the slightly FR gear 84 on the left reel gear 82b, a relatively long conduction of T ₃ seconds is performed again to the solenoid. As a result, the trigger arm 65 continues to be driven (FIG. 32), and the flywheel gear 7
The gear meshes with the next tooth of the cam gear 68 beyond 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 projection 81 of the brake arm 76 rides on the brake cam 73, pushes the brake arm 76 and latches the leading end of the brake arm 76 with the left and right reel gears 82a, 82b.
And the left and right reel stands 57a, 57b are fixed [FIG. 33]. At the same time, since the trigger arm 65 remains pulled, the FR arm 77 is fixed by the trigger arm 65 and is fixed so as not to move to the left reel gear 82b. Thereafter, when the power supply to 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 through the HOLD position 60d, and the cam gear 68 is moved to the STOP position 60e.
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], a pulse of T ₁ second is supplied to the solenoid 6 as in the FWD / PLAY mode. As a result, the trigger arm 65 operates and the cam gear 68
The rotation of the cam gear 68 by the assist pin 61 is released by releasing the engagement between the PLAY projection 66a and the trigger arm 65 that prevents the rotation of the cam gear 68 [FIG. 16]. As a result, the flywheel gear 7 meshes with the cam gear 68 beyond the PLAY toothless portion 69a, and the cam gear 68 is rotated by the rotational force of the motor. At this time, the FR arm 77
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, 74b
The gear 84 does not mesh with the left reel gear 82. In addition, 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 the original position, the pinch pressure spring 49 on the reverse side is used.
The actuating claw 40b of the head lever 17 that has pressed the 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
Also, the engagement with the left reel base 57b is stopped. After that, the FR arm 77 slightly
It is energized T ₃ seconds again to the solenoid 6 when swung toward the R gear 84 on the left reel gear 82b. As a result, the trigger arm 65 continues to be driven, and the cam gear 6
8 gets over the missing tooth 69b for FF / REW and
Without stopping in the REW mode, the gear meshes with the next gear surface and continues to rotate [FIG. 17]. Then, the driven projection 81 of the brake arm 76 rides on the brake cam 73, and the latch of the brake arm 76 is engaged with the left and right reel gears 82a, 82b to fix the left and right reel bases 57a, 57b (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 is fixed so as not to move to the left reel gear 82b side. Then, reverse arm 1
8, the reverse spin 78 moves to a holding position (hereinafter, referred to as a 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]. Thereafter, when the power supply to the solenoid 6 is stopped, 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 spin 78 is dropped from the HOLD position 79 of the reverse cam 72, so that the reverse arm 18 is in a free state. Thereby, 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. 5
1 ) 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 causes the trigger arm 65 to be pulled and the flywheel gear 7 to the cam gear 6
8 are engaged 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 again with the movement of the trigger arm 65 and is in the forward state [FIG. 27]. Then, the cam gear 6
After the state shown in FIG. 28 with the rotation of 8, the FR arm 77 returns to the intermediate position between the FF gear 75 and the left reel gear 82b due to the tension of the FR belt 87 [FIG. 29]. Then, in order to pass through the PLAY mode (FIG. 30) with the rotation of the cam gear 68, the forward reel base 57a rotates and the pinch roller 42a is moved to the capstan shaft 53.
a, but the cam gear 68 does not stop at the PLAY position but continues to engage and rotate with the next tooth by driving the trigger arm 65 by energizing the solenoid 6 [FIG.
1]. When the next FF / REW missing tooth portion 69b is reached, the tip of the trigger arm 65 is
The rotation of the cam gear 68 is stopped by contacting the F / REW projection 66b. At this time, the FR arm 77 is connected to the second FR pin 83
b is introduced between the FR cams 74a and 74b and rotated,
The FR gear 84 meshes 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 a fast-forward (FF) mode is achieved in which only the reel base 57a is rotated without the pinch roller 42a being brought into contact with the capstan shaft 53a. 35 and FIG.
8].

(From the STOP mode to the REW mode [FIG.
52 ) If the REW mode is selected in the STOP mode [FIG. 11], a pulse of T ₁ second is supplied to the solenoid 6 after the start of rotation of the motor as shown in FIG. This pulse energization causes the trigger arm 65 to be pulled and the flywheel gear 7 and the cam gear 68 to engage and start rotating.
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 again, and enters the forward state [FIG.
7]. Thereafter, with the rotation of the cam gear 68 [FIG. 28].
In this state, 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 the movement of the FR arm 77 to the FF gear 75 side is continuously prevented during the energizing time [FIG. 39].
At this time, in order to enter the PLAY mode [FIG. 30] 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.
Is long, the cam gear 65 does not stop at the PLAY position, goes beyond the PLAY missing tooth portion 69a, and continues to engage with the next tooth and rotate. 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 to the left reel gear 82b side and the FR arm 77 rotates.
The gear 84 is engaged with the left reel gear 82b. And
When the cam gear 68 reaches the FF / REW missing tooth portion 69b, the trigger arm 65 comes into contact with the FF / REW projection 66b, and the rotation of the cam gear 68 is stopped. As a result, the rotation of the FR gear 84 is transmitted to the left reel gear 82b, and the rewind (RE) that rotates only the left reel stand 57b without causing the pinch roller 42a to contact the capstan shaft 53a.
W) mode is entered [FIG. 40].

(From FF mode to STOP mode [FIG. 5
3 Reference) When STOP mode is selected in the 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 to allow the assist pin 61 to rotate the cam gear 68. As a result, the cam gear 68 meshes with the flywheel gear 7 beyond the FF / REW missing tooth portion 69b, and the cam gear 68 is rotated by the rotating force of the motor. Even if the CUE / REV toothless portion 69c reaches the position of the flywheel gear 7 with the rotation of the cam gear 68, since the solenoid 6 is still energized, the trigger arm 65 is moved to the CU position.
The movement of the assist pin 61 without abutting against the E / REV projection 66c causes the CUE / REV missing tooth portion 69c to move.
Overrides and meshes with the next tooth and continues to rotate. FR
The first FR pin 83a of the arm 77 is moved to the F position by the cam 74d.
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 slight delay.
Is moved in a direction away from the FF gear 75. As a result, the FR gear 84 is disengaged from the FF gear 75, and the right reel base 5
The transmission of rotation to 7a is interrupted, 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 is moved to the CUE / REV projection 66c. CUE by the movement of the assist pin 61 without hitting
・ It gets over the missing tooth 69c for REV and meshes with the next tooth.
Continue 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 to drive the brake arm 76 to fix the left and right reel stands 57a and 57b [FIG. 37]. Thereafter, when the power supply to the solenoid 6 is stopped, the trigger arm 65 returns to the original position, and the cam gear 68 that has been disengaged from the flywheel gear 7 at the STOP / HOLD toothless portion 69d is connected to the assist pin 61 by the assist pin 61. The trigger arm 65 is rotated by the force [FIG.
When it comes into contact with 6e, the rotation is stopped and the mode is shifted to the STOP mode [FIG. 11].

(From the REW mode to the STOP mode [FIG.
53 Reference) When the stop mode is selected in the REW mode [FIG. 40], as in the case of switching from FF mode to STOP mode, the cam gear 68 relatively long pulse is energized T ₅ seconds solenoid rotation FWD
After passing through the REV mode position [FIG. 41], FR gear 8
4 is removed 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 stands 57a and 57b (FIG. 42). afterwards,
Power supply to solenoid 6 is stopped, and STOP HOLD
The cam gear 68 disengaged from the flywheel gear 7 due to the missing tooth portion 69d rotates with the force of the assist pin 61 until the trigger arm 65 hits the STOP projection 66e [FIG. 43], and then shifts to the STOP mode [FIG. 11]. .

(From the STOP mode to the FWD / CUE mode )
When the FWD and CUE modes are 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. This pulse energization causes the trigger arm 65 to be pulled and the flywheel gear 7 and the cam gear 68 to mesh and start rotating. At the same time, the reverse arm 18 is also moved toward the outside of the reverse cam 72. However, since the drive time of the trigger arm 65 is short, the reverse arm 18 returns to the inside of the reverse cam 72 together with the movement of the trigger arm 65 to be in a forward state [FIG. 27]. Then, with the rotation of the cam gear 68 [Figures 28 and 29] FWD · PLAY mode from the via the state of FIG. 30 in but entering once energized again pulses T ₁ second to the solenoid 6 the trigger arm 65 is driven so that the cam gear 68
Without stopping at the AY missing tooth portion 69a, the cam gear 68 meshes with the next tooth and continues to rotate. Thereby, the FR arm 7
7 is switched to the FF gear 75 side, and the FR gear 84 temporarily shifts to the FWD / FF mode in which the FF gear 75 is engaged.
5 is pulled, the cam gear 68 is rotated by the force of the assist pin 61 beyond the FF / REW projection 66b, and 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 sent to the head chassis 2 again to the play position side while the FR gear 84 is engaged with the FF gear 75 . Assist cam 60 at this time
The displacement amount of the head chassis 2, that is, the feed amount of the head chassis 2 is PLA.
The pinch roller 42a does not contact the capstan shaft 53a, and prevents the play arm 54a from moving, so that the play gear 55a becomes a play clutch gear 56a.
And the head 11 is only in slight contact with the tape. Therefore, a fast-forward playback / cue (CUE) state in which the tape runs by fast-forward while producing a playback sound is entered [FIG. 36]. The reverse arm 18 is driven each time the solenoid 6 is driven. However, since the reverse arm 18 is located inside the reverse cam 72 and is not engaged with the head lever 17, it immediately returns to the original position.

(From STOP to RVS / REV mode)
When RVS · REV mode in FIG. 54 see]) STOP mode [11] is selected, after the start of rotation of the motor, a long T ₂ seconds pulses than during FWD · CUE is energized to the solenoid. The movement of the trigger arm 65 driven by the pulse current causes the flywheel gear 7 and the cam gear 6 to move.
8 starts to rotate. Reverse arm 1 at the same time
8 is also moved toward the outside of the reverse cam 72, and the state is such that the driving time of the trigger arm 65 is FWD / CU.
Since the length is longer than in the E mode, the reverse arm 18 goes out of the reverse cam 72 to be in a reverse state in which it moves along the reverse cam 72 [FIG. 12]. Thereafter, [13, 14] with the rotation of the cam gear 68 is temporarily enters the state through the RVS · PLAY state of FIG. 15, the trigger arm 65 is performed again energized T ₁ second to the solenoid 6 Since the cam gear 68 is driven, the cam gear 68 does not stop at the PLAY toothless portion 69a and continues to rotate by meshing with the next tooth (FIG. 16). Thus, although FR arm 77 enters the FR gear 84 is switched to the FF gear 75 side RVS · REW mode to mesh with the FF gear 75, the trigger arm 65 is energized pulse T ₁ seconds again to the solenoid 6
FF / REW projection 66b and missing tooth 6
The cam gear 68 continues to rotate further beyond 9b. This allows the FR gear 8 to stay in the RVS / REW mode without stopping.
The head chassis 2 is fed back to the PLAY position side while the gear 4 is engaged with the FF gear 75 . At this time, the displacement amount of the assist cam 60, that is, the feed amount of the head chassis 2 is P
It is smaller than LAY and larger than FF / REW. Therefore, the pinch roller 42b is connected to the capstan shaft 53b.
And the play gear 55b does not bite into the play clutch gear 56b because the play arm 54b is still engaged with the head chassis 2;
Only the head 11 contacts the tape lightly. Therefore, R
While the tape is running in the VS / REW state, only the head is pressed against the tape while the tape is running.
0].

(From the STOP mode to the FWD / REV mode )
When the FWD / REV 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. This pulse energization causes the cam gear 68 to engage with the flywheel gear 7 and start rotating, and the driving time of the trigger arm 65 is short, so that a forward state is established (FIG. 27). Thereafter, when passing through the state of becoming companion [28] to the rotation of the cam gear 68, a relatively long T of ₆ seconds energization is performed to the solenoid 6 again. As a result, the trigger arm 65 moves and the F
The movement to the F gear 75 side is prevented [FIG. 39], the PLAY mode [FIG. 30] is passed, and the rotation is further continued. P
The cam gear 68 that has passed through the LAY position is
Is swung toward the left reel gear 82b by the FR cam 74b to cause the FR gear 84 to mesh with the left reel gear 82b.
The mode shifts to the WD / REW mode, but since the power supply to the solenoid 6 is continued, the trigger arm 65 is set to the FF / R mode.
In order to further rotate the cam gear 68 by meshing with the next tooth beyond the EW projection 66b and the missing tooth portion 69b, the FWD · R
Pass through 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 fed back to the PLAY position. And rewind playback / review (REV) which makes the tape run faster by rewinding while producing the playback sound
The mode is shifted to [FIG. 41]. In addition, the reverse arm 18
Continues to be driven by long energization of the solenoid 6, but is located inside the reverse cam 72 and the head lever 17
Does not move to the reverse state.

(From STOP to RVS / CUE mode)
When RVS · CUE mode is selected in FIG. 55 see]) STOP mode [11], a long T ₂ seconds pulses than FWD · REV mode is energized rotating after the start solenoid 6 of the motor. This pulse energization causes the cam gear 68 to start rotating and the reverse arm 18 to rotate the reverse cam 7.
2 and enters a reverse state [FIG. 12]. Thereafter, a relatively long T of ₆ seconds energization is performed to the solenoid 6 again via the state of FIG. 28 with the rotation of the cam gear 68. As a result, the trigger arm 65 is moved to the FR arm 77.
Is prevented from moving toward the FF gear 75 side (FIG. 23).
Enter S / PLAY mode [Fig.15]
Is continuously energized, the cam gear 68 is PLA
Without stopping at the Y position, the PLAY projection 66a and the toothless portion 6
The rotation continues further beyond 9a. And FR arm 7
7 is driven by the FR cam 74b to engage the FR gear 84 with the left reel gear 82b to cause the RVS.
Shift to FF mode. However, since the energization of the solenoid 6 is continued, the trigger arm 65
The cam gear 6 extends beyond the EW projection 66b and the toothless portion 69b.
8 is further rotated to pass the RVS / FF mode.
Then, the cam gear 68 is further rotated, and the FR arm 77 is fixed while the FR gear 84 is meshed with the left reel gear 82b by the FR cam 74b.
Send it to the AY position. This CUE REV position 6
0c, ie, the displacement of the assist cam 60, ie, the head chassis 2
Is smaller than the PLAY position 60a.
-It is larger 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, only the head is pressed against the tape while the tape is running in the RVS / FF mode, and the RVS / C is reproduced.
The UE enters the UE state [FIG. 24].

(From FWD / PLAY mode to FWD / C
Go to UE mode [Refer to Fig. 56] ) FWD / C in FWD / PLAY mode [Fig. 30]
When the UE mode is selected, a pulse of T ₁ second is supplied to the solenoid 6. Since the trigger arm 65 is disengaged from the PLAY projection 66a by the pulse current, the cam gear 68 starts to rotate by meshing with the flywheel gear 7. The rotation of the cam gear 68 causes the assist pin 6
1, the head chassis 2 returns toward the STOP position, and the forward-side play arm 54a moves to move the play gear 55a.
Is separated from the play clutch gear 56a and FWD · P
Release 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. FF state [FIG. 35] is entered. Here, a pulse for T1 seconds is again supplied to the solenoid 6 and the trigger arm 65 is pulled.
FWD ・ FF beyond the W projection 66b and the missing tooth 69b
The cam gear 68 is rotated without stopping at the position. And
With the FR gear 84 meshed with the FF gear 75 , the cam displacement of the assist cam 60 at the CUE / REV position 60c is given to the head chassis 2 and sent toward the PLAY position. Assist cam 6 at this CUE / REV position 60c
0, that is, the feed amount of the head chassis 2 is PL
Since it is smaller than the AY position 60a and larger than the FF / REW position 60b, only the head 11 makes slight contact with the tape and runs the tape in the FF state to reproduce the FWD.
The state changes to the CUE state [FIG. 36].

(From RVS / PLAY mode to RVS / R
Go to EV 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 supplied to the solenoid 6 and the trigger arm 65 is set to the PL level.
When the cam gear 68 is disengaged from the AY projection 66a and engages with the flywheel gear 7 to start rotation, the head chassis 2 starts to return to the STOP position side to release the PLAY state. Further, with the rotation of the cam gear 68, the FR arm 77 is switched to the FF gear 75 side so that the FR gear 84
While entering the F RVS · REW mode to mesh with the gear 75, RVS · beyond the FF · REW projections 66b and toothless portion 69b for trigger arm 65 T ₁ second pulse is energized is drawn back into the solenoid 6 The cam gear 68 is rotated without stopping in the REW mode. And FR
With the gear 84 meshed with the FF gear 75, the cam displacement 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 tape in EW state
It becomes an EV state [FIG. 20].

(From the FWD / CUE mode to the STOP mode )
When STOP mode is selected in [refer to FIG. 57]) FWD · CUE mode [36] to de, relatively short pulse of T ₁ seconds is energized to the solenoid 6, the trigger arm 65 CUE · RE
The cam gear 68 is rotated by disengaging from the V projection 66c (FIG. 37). The first FR pin 83a rides on the FR cam 74d with the rotation of the cam gear 68, and swings the FR arm 77 toward the left reel gear 82b.
Is disconnected from the FF gear 75 to release the FWD / CUE mode. The second FR pin 83b is held at the intermediate position by the cam 74a. Thereafter, 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. 37). 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.
8], the mode is shifted to the STOP mode [FIG. 11].

(From the FWD / REV mode to the STOP mode )
When STOP mode is selected in [refer to FIG. 57]) FWD · REV mode [41] to de, trigger arm 65 relatively short pulse of T ₁ seconds is energized to the solenoid 6 is CUE · REV
The cam gear 68 starts rotating after coming off the projection 66c for use [FIG. 42]. At this time, the FR arm 77 is connected to the second FR pin 8
Since the 3b moves away from the FR cam 74b, the FR belt 87 is swung by the tension of the FR belt 87 in a direction of separating the FR gear 84 from the left reel gear 82b, and the FWD / REV mode is released. The FR gear 84 disengaged from the left reel gear 82b is
The FR arm 77 is prevented from moving toward the FF gear 75 by the tension of the R belt 87 and the engagement of the trigger arm 65, 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, 57b are fixed [FIG. 42]. Thereafter, 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 )
When the STOP mode is selected in the RVS / CUE mode [FIG. 24], a relatively long pulse of T ₇ seconds is supplied to the solenoid, and the trigger arm 65 is set to the CUE / REV mode.
The cam gear 68 starts rotating after coming off the projection 66c (FIG. 25). The rotation of the cam gear 68 causes the FR arm 77 to swing away in a direction to separate the FR gear 84 from the left reel gear 82b by the tension of the FR belt 87 because the second FR pin 83b is separated from the restraint of the FR cam 74b. Is released. FR arm 77
Is prevented from rotating toward the FF gear 75 by the trigger arm 65, and the FR gear 84 is held at an intermediate position between the left reel gear 82b and the FF gear 75. Further, mosquito brake cam 73 with the rotation of the wheat <br/> A 68 fixes the reel stand 57a, 57 b of the right and left by driving the brake arm 76 FIG. 25. Thereafter, as the cam gear 68 rotates, the assist pin 61 moves on the assist cam STO.
When the assist pin 61 reaches the HOLD position 60 d of the assist cam 60, the reverse spin 78 moves to the HOLD position 79 of the reverse cam 72.
And the reverse arm 18 is moved toward the forward side, and the trigger arm 65 is brought into contact with the HOLD projection 66d which also serves as the trigger cam 67, so that the cam gear 6
Stop rotation of 8. That is, the state shifts to the HOLD state in which the head chassis 2 is stopped by the trigger arm 65 [FIG. 26]. Thereafter, the power to the solenoid 6 is cut off and the trigger arm 65 returns to the original position by the force of the spring 96 stretched between the reverse arm 18, so that the cam gear 68 starts to rotate again and the assist pin 61 Ru are moved to the STOP position 60e. Then, the head chassis 2 is returned to the STOP position, and the reverse spin 78 on the reverse cam 72 is moved from the HOLD position 79 to the ST position.
After dropping to the OP position, the head lever 17 is returned to the forward side. As a result, the head holder 14 is rotated, and the STO in which the head 11 is set at a predetermined position in the forward state is
The mode shifts to the P mode [FIGS. 11, 44].

(From RVS / REV mode to STOP mode )
When the STOP mode is selected in the RVS / REV mode [FIG. 20], a relatively long pulse of T ₇ seconds is supplied to the solenoid 6 and the trigger arm 65 is set to the CUE / RE.
The cam gear 68 starts rotating after coming off 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 a direction to separate the FR gear 84 from the FF gear 75 to release the RVS / REV mode. The FR arm 77 is moved by the trigger arm 65 to the left reel gear 82b.
To the left reel gear 82b and the left reel gear 82b.
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. 21).
Thereafter, the assist pin 61 is rotated with the rotation of the cam gear 68.
Moves toward the STOP position 60e on the assist cam 60, and enters a HOLD state in which the assist pin 61 is stopped at the HOLD position 60d on the way [FIG.
2] The movement of the head chassis 2 and the head lever 17 is stopped by the assist pin 61 so as to reduce the acceleration when returning to the STOP position. Thereafter, the power to the solenoid 6 is cut off, and the trigger arm 65 returns to the original position by the force of the spring 96.
8 starts rotating again, moves the assist pin 61 to the STOP position 60e, and drops the reverse spin 78 on the reverse cam 72 from the HOLD position 79 to the STOP position. This causes a transition to the STOP mode [FIG.
1].

The above embodiment is a preferred embodiment of the present invention, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, as shown in FIG. 10 , the head chassis 2 and the head mounting frame 31 are formed by bending the same frame material and integrally forming the same, but the present invention is not limited to this. The head mounting frame 31 and the head mounting frame 31 may be formed separately and then assembled with screws or the like, or may be fixed by welding, bonding, or the like.

[0054]

As is apparent from the above description, in the rotary head holding mechanism of the present invention, the bearing of the head holder is fitted to the bearing of the head frame so that the head holder is inserted from above the head frame. Then, the head frame is mounted on the head chassis with the toothless portion of the pinion of the head holder facing the open portion of the U-shaped bearing portion and the projection of the head mounting frame passing over the toothless portion of the pinion. The head holder that holds the rotary head and the gear that transmits the head rotational force, that is, the pinion, can be integrally formed, and the head position and the pinion position can be accurately positioned. . In addition, by integrally molding the head holder and the pinion, the number of parts can be reduced and the number of assembling steps can be reduced, resulting in cost reduction.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a rotary head holding mechanism of the present invention, wherein (a) is a front view showing a forward state, and (b) is a perspective view of a head holder part.

FIG. 2 is a sectional view taken along the line II-II showing a relationship between a head holder and a head frame in FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a diagram illustrating a reverse state of FIG. 1;

FIG. 5 is a diagram illustrating a HOLD state in FIG. 1;

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

FIG. 7 is a schematic diagram showing a relationship between gears, cams and the like of the tape recorder of FIG . 6 ;

FIG. 8 is a view illustrating a relationship between an assist cam and an assist pin.
FIG.

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

FIG. 10 is an exploded perspective view showing an exploded view of a 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
FIG. 9 is a gear mechanism diagram showing a state at a branch point for selecting a mode.

FIG. 14 is a gear mechanism diagram showing a state where an 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 a transition is made from the RVS / PLAY mode to the STOP mode or the RVS / REV mode.

FIG. 17 is a gear mechanism diagram showing a state in which a STOP mode has been selected from the RVS / PLAY mode.

FIG. 18 is a gear mechanism diagram showing a state where a brake is applied to the reel base when shifting 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 an RVS / CUE mode.

FIG. 25 is a gear mechanism diagram showing a brake state when shifting 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 a FWD / PLAY selection state.

FIG. 28 is a gear mechanism diagram showing a state at a branch point where a REW mode and an FWD / PLAY mode are selected.

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

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

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

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

FIG. 33 is a gear mechanism diagram showing a brake state when shifting from the FWD / PLAY mode to the STOP mode.

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

FIG. 39 is a gear mechanism diagram showing a state in which the 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 a 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 illustrating 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 movements of a solenoid and each arm associated with the solenoid when switching from the STOP mode to the FWD / PLAY mode or the RVS / PLAY mode.

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

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

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

[FIG. 53] STO from FF mode or REW mode
6 is a time chart for switching to a P mode.

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

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

FIG. 56: From FWD / PLAY state to FWD / CUE mode or from RVS / PLAY state to RVS / RE
6 is a time chart for switching to a V mode.

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

FIG. 58 is a time chart for 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 longitudinal sectional view showing another embodiment of the pinch arm.

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

FIG. 62 is an exploded perspective view showing an example of a conventional rotary head holding mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 Head holder 15 Head frame 22 Pinion which is a gear for head rotation 27 Bearing part of head holder 30 Substantially U-shaped bearing part 31 Head mounting frame 58 Convex part of head mounting frame 86 Missing part of pinion

Claims (1)

(57) [Claims] 1. A head holder for holding a magnetic head, a head frame for rotatably supporting the head, and a head mounting frame for mounting the head frame on a head chassis, wherein the head holder is supported by the head frame. And a head rotating gear formed integrally with the head holder, and a part of the head rotating gear is formed as a toothless portion to form a substantially tangential plane passing through the bearing of the head holder. The head mounting frame has a substantially U-shaped bearing portion for supporting the bearing portion, and the head mounting frame is opposed to the U-shaped bearing portion when the head frame is assembled. A rotary head holding mechanism for a tape recorder, wherein a contacting convex portion is provided.