JP2672045B2 - Control mechanism of 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 tape recorder control mechanism. More specifically, the present invention provides a mode selection
The present invention relates to improvement of a tape recorder control mechanism including an assist cam and an assist pin that move a head chassis and the like by using rotation of a motor when switching.

[0002]

As a conventional control mechanism which utilizes the rotation of a motor for driving such a head chassis, for example, FIG. 6
As shown in FIG. 1 , a combination of an assist cam 101 integrally formed with a cam gear 104 and an assist pin 102 made of a straight pin is used. The assist cam 101 has a cam contour formed by forming a recess on one surface of the cam gear 104, for example. The cam gear 104 has a toothless portion 106, and is provided so as to be selectively meshed with a driving gear, such as a flywheel gear (gear coaxial with the flywheel) 103, which is connected to a motor and constantly rotates. Cam gear 104 and flywheel gear 103
The engagement with is performed by slightly rotating the cam gear 104, triggered by the movement of a solenoid (not shown) or the like. On the other hand, the assist pin 102 is directly connected to the head chassis (not shown) via the assist arm 105 or without being interposed. And
The assist pin 102 has a thickness sufficient to withstand the reaction force when the pinch roller on the head chassis is pressed against the capstan and the spring force that urges the head chassis to return to its original position.

[0003]

In such a tape recorder control mechanism, an assist is provided on the cam surface of the assist cam 101 in order to quiet the movement of the head chassis and the like when changing from each operation mode to the stop mode. It is preferable to move the pin 102 near the stop position of the assist cam 101, that is, to completely control the movement of the head chassis by the assist cam 101. And in that case, the assist pin 10
It is advantageous to slow the movement of the head chassis to reduce the impact by slowing the inclination for moving the distance of one.

However, since the stop position and its vicinity are near the basic circle of the assist cam 101, the cam gear 10
The cam displacement amount with respect to the rotation angle of 4 becomes smaller. Furthermore,
If the diameter of the assist pin 102 is large, the assist pin 10
The rotation angle of the assist cam 101 with respect to 2 also becomes large. Therefore, one cam cannot perform complicated control in a limited space. To avoid this, increase the size of the assist cam 101 or the assist pin 1
The diameter of 02 may be reduced.

However, the assist cam (cam gear 1
02) The size of 101 is restricted by space.
Especially in case of reverse type tape recorder, assist cam 1
When 01 is placed in the center of the left and right capstans, the size of the cam is restricted by the size of the cassette (size between capstans), and therefore the assist cam 101 cannot be made large. In addition, when the assist pin 102 has a small diameter in order to perform complicated control with a limited size of the assist cam, for example, in order to drive many modes, when the distance from the center of the cam becomes long as in playing, the capstan becomes large. The assist pin 102 may be broken due to a reaction force or a spring load caused by pressing the assist pin 102 against the assist pin 102.

An object of the present invention is to provide a tape recorder control mechanism capable of performing complicated control with a cam having a limited size.

[0007]

To achieve the above object, the present invention provides a driving gear that rotates together with a motor,
A tape provided with a cam gear having a toothless portion and meshing with the drive gear, an assist cam driven by the cam gear, and an assist pin for slidingly contacting the assist cam and moving a head chassis carrying a magnetic head or the like. In the control mechanism of the recorder, the assist pin is a two-stage pin having a small diameter portion on the tip side and a large diameter portion on the root side, and the assist cam has a cam contour whose small portion is near the base circle of the cam. It is configured to have a step that is in sliding contact with the base circle and is in sliding contact with the large diameter portion of the assist pin.

[0008]

Therefore, when the cam displacement given from the assist cam is small, the small diameter portion on the tip side of the assist pin follows the cam contour of the assist cam, and when the cam displacement is large, the large diameter portion on the base side of the assist pin is the assist cam. Follow the cam contour. That is, when the movement of the head chassis is relatively large in the play mode or the like and the reaction force from the spring load or the capstan or the like is large, the assist cam follows the assist cam with the large diameter portion of the assist pin, and the head chassis immediately before reaching the stop mode. When the movement of the assist pin is relatively small and the reaction force or the like is small, the assist cam is followed by the small diameter portion of the assist pin.

[0009]

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.

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 to the forward side and the reverse side, a mode selection mechanism that switches the mode of the tape recorder, and a motor (not shown) as a drive source for these.
And switches (not shown) for mode switching and the like and a chassis (not shown) for supporting them. This tape recorder 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 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 comprises 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 the tape guide 13 are fixed, and the head block 19.
Cylindrical rotating member 20 for accommodating
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 flat 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 is for supporting the head holder 14 and attached 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 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.
0. Therefore, the head holder 14 is accommodated by dropping it from the upper side with respect to the head frame 15, and the shaft portion 27 between the pinion 22 and the rotating member 20 is engaged with the small-diameter bearing portion 30 and the azimuth adjusting plate 21. It is housed so as not to be disengaged in the axial direction due to the engagement with the semicircular groove portion 29. Further, the open surface side of the head frame 15 is partially formed by the head mounting frame 31 of the head chassis 2, the convex portion of the head mounting frame 31, and the bearing portion 30 in a state of being mounted on the head chassis 2. The head holder 14 that is closed and accommodated is provided so as not to be separated upward. The head frame 15 is fixed to 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.
The small-diameter bearing portion 30 is formed of a pentagonal groove in this embodiment.

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. 5, the pinch arms 43a and 43b are, for example, support shafts 44a and 44 fixed to the 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 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 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. 59 and 60 , 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 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
The small diameter portion 61b abuts on the assist cam 60 at the portion 86 where the cam contour approaches the vicinity of the base circle, such as 0d and the stop position 60e, and other mode positions 60 other than that are excluded.
The large-diameter portion 61a is formed so as to abut on a, 60b, 60c and its intermediate path. 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, the assist pin 1
It is advantageous to make the inclination for moving the distance for each piece gentle so as to slow down the movement of the head chassis 2 and the head lever 17 and reduce the impact. For this purpose, the diameter of the assist pin 61 may be made thin. However, if the diameter of the assist pin 61 is made thin, when the distance from the center of the cam becomes long as in play, the assist load of the return coil spring 51 assists. The pin 61 may be broken. 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. In order to increase the angle corresponding to the slope required for rolling the pin just before using merge stop position durable when spring load, such as the play mode is large, the assist pins as shown in (b) and (c) of FIG. 7 61 is a large diameter portion 61a and a small diameter portion 61
It is a two-stage pin consisting of b and b. Furthermore, stop position 60
On the cam surface 86 near the e and hold position 60d and the vicinity of the basic circle, the cam surface is made thinner in the axial direction than other portions, and the cam surface is formed only at a position corresponding to the small diameter portion 61b of the assist pin 61 to assist. A step 58 is provided so as to contact only the small diameter portion 61b of the pin 61. Therefore, other portions 60a other than the cam surface 86 near the stop position 60e, the hold position 60d, and the vicinity of the base circle in the vicinity thereof,
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,
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. .

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, as shown in FIG. 7,
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 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. 58 , the FR gear 84 is fitted on a 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 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. 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 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 coaxial with the forward side flywheel 9 connected to the motor pulley 8 fixed to the motor via the main belt 10. When the toothless portions 49a, 49b, 49c, and 49d move, the engagement is released and the protrusions 66a, 66b, and 66 are released.
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 STOP mode to FWD / PLAY mode
Dohe [see FIG. 48] STOP mode [ see FIGS. 10 and 4]
3 ], when the FWD / PLAY mode is selected,
After the motor starts rotating, the solenoid 6 is energized with a pulse of T ₁ second. This pulse energization causes the trigger arm 6
Since 5 is pulled, the engagement with the projection 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. As a result, the flywheel gear 7 and the cam gear 6
8 and 8 mesh and start rotation. Reverse arm 18 at the same time
Is also moved toward the outside of the reverse cam 72,
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. Therefore, the reverse pin 78 of the reverse arm 18 goes into the inside of the reverse cam 72 and enters the forward state of moving inside the reverse cam 72 [FIG. 2 ].
6 ]. Then, as the cam gear 68 rotates, the first FR pin 83a of the FR arm 77 rises to the FR cam 74c, and the FR gear 84 is slightly fed to the left reel gear 82b side.
However, since the second FR pin 83b is in the free state, the FR gear 84 does not come into mesh with the left reel gear 82b [Fig. 27 ]. After that, the first of the FR arm 77
Since the FR pin 83a drops from the FR cam 74c and the FR arm 77 becomes free, 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. 28 ]. 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, and the FR arm 7
Since the movement of 7 is restricted and the FR gear 84 is fixed to the neutral position, the PLAY toothless portion 69a comes to the position of the flywheel gear 7, and the transmission of rotation to the cam gear 68 is interrupted [Fig. 29 ]. . At this time, the assist pin 61 is slightly lower than the maximum displacement position of the assist cam 60.
Since it is located at the LAY position 60a, the head chassis 2 is in the most fed state. Then, the tip of the trigger arm 65 and the PLAY projection 66a of the cam gear 68 come into contact with each other, and the rotation of the cam gear 68 is blocked. Cam gear 6
8 is the trigger arm 6 due to the spring force of the return coil spring 51 that is biased via the assist pin 61.
If the presser foot of 5 is exhausted, it is ready to rotate. 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, and the reverse side guide claw 39b of the head lever 17 is moved to the reverse side play arm 54b.
The play gear 55b on the reverse side is provided so as not to 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 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 pressed to push the pinch roller 42a against the capstan shaft 53a, and the play arm 54a is moved to the play clutch gear 56a via the play arm operating spring 50a.
Rotate to the side [Fig. 46 ]. As a result, the forward side pinch roller 42a presses the tape against the capstan shaft 53a and runs, while the play gear 55a meshes with the play clutch gear 56a to rotate the reel F.
The WD / PLAY mode is set [Fig. 29 ].

From STOP mode to RVS / PLAY mode
Mode [ see FIG. 48 ] R in STOP mode [FIG. 10 ]
When the VS / PLAY mode is selected, after the motor starts rotating as shown in FIG. 48 , the solenoid 6 is energized with a pulse of T ₂ seconds as shown by the broken line. 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 and the cam gear 68 is pushed.
To feed the flywheel gear 7 and cam gear 68
Mesh with. At the same time, the reverse arm 18 is also moved toward 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 the outside of the reverse cam 72 and the reverse cam 18 moves. The reverse state moves along 72 [Figs. 11 and 12 ]. Thereafter, the first FR pin 8 of the FR arm 77 is rotated as the cam gear 68 rotates.
3a rides on the FR cam 74c, and the FR gear 84 is slightly sent to the left reel gear 82b side. However, since the second FR pin 83b is in the free state and is pulled by the FR belt 87, the FR gear 84 becomes the left reel gear 82b.
It does not reach the point of meshing with [Fig. 12 ]. After that, 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 moved to the FR belt 87
Is pulled back and placed in a neutral state [Fig. 1
3 ]. Further, when the rotation of the cam gear 68 progresses and the second FR pin 83b is guided between the FR cam 74a and the FR cam 74c to restrict the movement of the FR arm 77, the FR gear 84
PLAY toothless portion 69a in a state where is fixed to the neutral position
To reach the position of the flywheel gear 7, the cam gear 68
Transmission of rotation to is cut off. At this time, the above-mentioned FWD
The difference from the 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 guide claw 3 on the forward side is moved.
9a engages with the play arm 54a to restrict its movement to prevent the play gear 55a from being caught in the play clutch gear 56a, and the forward side operation pawl 40a is displaced from the pinch pressure spring 49a to move the head chassis 2. This prevents the forward pinch roller 42a from being pressed against the capstan shaft 53a. Then, the operating claw 4 on the reverse side of the head lever 17
0b presses the pinch pressure spring 49b to press the pinch roller 42b against the capstan shaft 53b, and the play arm 54b is rotated to play the play gear 55.
b is engaged with the play clutch gear 56b, and the RVS / PLAY mode in which the left reel 57b is rotated by the reverse side pinion 3a is set [FIGS. 14 and 4] .
4 ].

From FWD / PLAY mode to STOP mode
[See FIG. 49 ] When the STOP mode is selected in the FWD / PLAY mode [FIGS. 29 and 46 ], 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 assist pin 6 is removed.
The rotation of the cam gear 68 by 1 is permitted. 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. 30 ]. At this time, in the FR arm 77, the movement of the second FR pin 83b is restricted between the FR cam 74a and the FR cam 74b.
Although the FR arm 77 swings along the R cams 74a and 74b, the FR gear 84 does not move the left reel gear 82b or the FF.
It does not mesh with the 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 begins to return to the original STOP position, the operating claw 40a of the head lever 17 that pressed the forward pinch pressure spring 49a also retracts and the capstan shaft 53.
The pressing of the pinch roller 42a to a is released, the bias to the play arm 43a is also released, the engagement between the play gear 55a and the play clutch gear 56a is released, and the rotation transmission to the reel base 57a is stopped. Then, F
The R arm 77 slightly shifts the FR gear 84 to the left reel gear 82.
When swinging toward b, the solenoid is again energized for a relatively long time of T ₃ seconds. As a result, the trigger arm 65 continues to be driven [Fig. 31 ], and the flywheel gear 7 meshes with the next tooth of the cam gear 68 over the FF / 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 engages the latches at the ends thereof with the left and right reel gears 82a and 82b, respectively, to fix the left and right reel bases 57a and 57b [Fig. 32 ]. 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. After that, when the power supply to the solenoid 6 is stopped, the trigger arm 65 returns to its original position and the assist pin 61 is held.
After passing through the position 60d, the position moves to the STOP position 60e, and the cam gear 68 is rotated to the STOP mode position [FIGS. 10 and 43 ].

From the RVS / PLAY mode to the STOP mode
To de [see Figure 49] RVS · PLAY mode [14]
When STOP mode is selected in, FWD / PL
As in the AY mode, the solenoid 6 is energized with a pulse of T ₁ second. As a result, the trigger arm 65 is actuated to release the engagement between the trigger arm 65 and the PLAY protrusion 66a that blocks the rotation of the cam gear 68 to allow the cam pin 68 to rotate by the assist pin 61 [Fig.
15 ]. 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, in the FR arm 77, the movement of the second FR pin 83b is restricted between the FR cam 74a and the FR cam 74b, so that the FR arm 7 moves along the FR cams 74a and 74b.
Even if 7 swings, the FR 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 cam 72
Make a constant movement along the displacement of. Further, since the head chassis 2 starts to return to the original position, the head lever 17 that presses the pinch pressure spring 49b on the reverse side is pressed.
The operating claw 40b of the same also retreats, releasing the pressing of the pinch roller 42b to the capstan shaft 53b, releasing the bias to the play arm 54b, releasing the meshing of the play gear 55b with the play clutch gear 56b, and releasing the left. The rotation force application to the reel stand 57b is stopped. After that, when the FR arm 77 slightly swings the FR gear 84 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, the cam gear 68 goes over the FF / REW toothless portion 69b, does not stop in the RVS / REW mode, and continues meshing with the next gear surface to rotate [FIG. 16 ]. Then, the driven projection 81 of the brake arm 76 rides on the brake cam 73 and the latches of the brake arm 76 are engaged with the left and right reel gears 82a and 82b, respectively, and the left and right reel bases 57a and 57b are fixed [FIG. 17 ]. 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, the reverse pin 78 of the reverse arm 18 holds the reverse cam 72 at the holding position (hereinafter referred to as HOLD position) 7.
9 and the trigger arm 65 moves to the trigger cam 6
7 and engages the assist pin 61 with the HO of the assis cam 60.
It is held at the LD position 60d [FIG. 18 ]. 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. As a result, the head lever 17 is moved to the original position, that is, the forward state by the force of the spring 36. And ST
The operation shifts to the OP mode [FIGS. 10 and 43 ].

From STOP mode to FF mode [FIG.
Reference] When the FF mode is selected in the STOP mode [FIG. 10 ], the solenoid T ₁
The second pulse is energized. This pulse energization pulls the trigger arm 65 to engage the flywheel gear 7 with the cam gear 68 and rotate it by the motor. Reverse arm 18 driven by trigger arm 65
Since the driving time of the trigger arm 65 is short, the actuator moves back to the inside of the reverse cam 72 with the movement of the trigger arm 65 and enters the forward state [FIG. 26 ]. Then, after a state of FIG. 27 with the rotation of the cam gear 68, F
FR arm 77 by the tension of the R belt 87 returns to the intermediate position between FF gear 75 and the left reel gear 82b [2
8 ]. Since the PLAY mode [Fig. 29 ] is passed along with the rotation of the cam gear 68, the forward reel table 5
7a is rotated and the pinch roller 42a is brought into contact with the capstan shaft 53a, but the cam gear 68 is moved to P by driving the trigger arm 65 by energizing the solenoid 6.
It does not stop at the LAY position and continues meshing and rotating with the next tooth [Fig. 30 ]. Then, the next FF / REW toothless portion 69b
When the tip reaches the end, the tip of the trigger arm 65 is moved to the cam gear 6
8 and the cam gear 68 by contacting the FF / REW projection 66b.
Stop the rotation of. At this time, the FR arm 77 rotates by the second FR pin 83b being introduced between the FR cams 74a and 74b, and 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 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. 34 and figure
47 ].

From STOP mode to REW mode [FIG.
1 Browse the REW mode in STOP mode [10] is selected, after the start of rotation of the motor, as shown in FIG. 51, T ₁ second pulse is energized to the solenoid 6. 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 becomes the forward state [FIG. 26 ]. Then, as the cam gear 68 rotates, [Fig.
27 ], but the solenoid is again energized for T ₄ seconds here. As a result, the trigger arm 65 moves and engages with the FR arm 77, and
The movement toward the F gear 75 side is continuously prevented during the energizing time [Fig. 3
8 ]. At this time, since the PLAY mode [FIG. 29 ] is entered with the rotation of the cam gear, the right reel stand 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, goes beyond the PLAY missing tooth portion 69a, and continues to rotate while meshing with the next tooth. Then, the second FR pin 83b moves along the FR cam 74b as the cam gear 68 rotates, so that the FR arm 77 rotates toward the left reel gear 82b to engage the FR gear 84 with the left reel gear 82b. Then, when the cam gear 68 reaches the FF / REW toothless portion 69b, the trigger arm 65 causes the FF / REW protrusion 66.
The rotation of the cam gear 68 is stopped by making contact with b. As a result, the rotation of the FR gear 84 is transmitted to the left reel gear 82b, and only the left reel base 57b is rotated without contacting the pinch roller 42a with the capstan shaft 53a to rewind (R
EW) mode is entered [Fig. 39 ].

From FF mode to STOP mode [FIG.
When STOP mode is selected in the reference] FF mode [FIG. 34], T ₅ to the solenoid 6, as shown in FIG. 52
A relatively long pulse of seconds is energized. 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 when the CUE / REV toothless portion 69c reaches the position of the flywheel gear 7 as the cam gear 68 rotates, the trigger arm 65 is still energized.
Moves over the CUE / REV toothless portion 69c by the movement of the assist pin 61 without hitting the CUE / REV protrusion 66c, meshes with the next tooth, and continues to rotate. The first FR pin 83a of the FR arm 77 is attached to the cam 74d.
Therefore, when the FR arm 77 is separated from the FF gear 75, the second arm of the FR arm 77 is slightly delayed with the rotation of the cam gear 68.
The FR pin 83b is also pushed by the FR cam 74a and moves the FR arm 77 in the direction away from the FF gear 75. As a result, the FR gear 77 is disengaged from the FF gear 75, the transmission of rotation to the right reel stand 57a is interrupted, and the FF mode is released. Then, as the cam gear 68 rotates, the CUE
Even when the REV toothless portion 69c reaches the position of the flywheel gear 7, since the solenoid 6 is still energized, the trigger arm 65 causes the CUE / REV protrusion 66.
The assist pin 61 moves over the CUE / REV toothless portion 69c without hitting c and meshes with the next tooth to continue rotating without stopping at the FWD / CUE position. Thereafter, the drive projections 81 ride up of the right and left by driving the brake arm 76 reel stand 57a of the brake arm 76 to the brake cam 73, to fix the 57 b [3
6 ]. After that, when the power supply to the solenoid 6 is stopped,
The trigger arm 65 returns to the original position, and STOP / HO
The cam gear 68 disengaged from the flywheel gear 7 in the LD toothless portion 69d is rotated by the force of the assist pin 61 [Fig. 37 ], and the trigger arm 65 is moved to STO.
When contacting the P protrusion 66e, the rotation is stopped and stopped.
It shifts to the mode [Fig. 10 ].

From REW mode to STOP mode [FIG.
2 ] When the stop mode is selected in the REW mode [FIG. 39 ], as in the case of switching from the FF mode to the STOP mode, a relatively long pulse of T ₅ seconds is supplied to the solenoid to rotate the cam gear 68. The
After passing through the FWD / REV mode position [Fig. 40 ],
The R gear 84 is disengaged from the left reel gear 82b, and then the brake arm 76 is operated by the brake cam 73,
The left and right reel stands 57a and 57b are fixed [Fig. 41 ].
After that, the power supply to the solenoid 6 is stopped and STOP /
Flywheel gear 7 by the toothless portion 69d for HOLD
The cam gear 68, which has come off the ST, is ST by the force of the assist pin 61.
The trigger arm 65 rotates until it hits the OP protrusion 66e [Fig. 42 ], and then shifts to the STOP mode [Fig.
10 ].

From STOP mode to FWD, CUE mode
To [Refer to FIG. 53 ] F in STOP mode [FIG. 10 ]
When the WD or CUE mode is selected, 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, but the forward state returns to the inside of the reverse cam 72 with movement of the trigger arm 65 for driving time is short the trigger arm 65 [2
6 ]. Then, with the rotation of the cam gear 68 [Figure 27
28 ] and the FWD / PLAY mode [Fig. 29 ] is temporarily entered, but since the pulse of T ₁ second is supplied to the solenoid 6 again to drive the trigger arm 65, the cam gear 68 is not provided for PLAY. It does not stop at the tooth portion 69a but meshes with the next tooth of the cam gear 68 and continues to rotate. As a result, the FR arm 77 is switched to the FF gear 75 side, and the FR gear 84 temporarily shifts to the FWD / FF mode state in which the FR gear 84 meshes with the FF gear 85. However, since the solenoid 6 is energized again and the trigger arm 65 is pulled,・ REW
The cam gear 68 is rotated by the force of the assist pin 61 over the projection 66b and meshes with the next tooth of the cam gear 68. As a result, the cam gear 68 is rotated by the rotation of the motor without stopping in the FWD / FF mode, and the assist pin 61 is fed again to the play position side while the FR gear 84 is meshed with the FF gear 85. The displacement amount of the assist cam 60 at this time, that is, the feed amount of the head chassis 2 is smaller than that at the time of PLAY, and the pinch roller 4
2a does not abut the capstan shaft 53a, prevents the play arm 43a from moving and prevents the play gear 55a from meshing with the 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 is run by fast-forwarding while producing a playback sound [Fig. 35 ].
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 [Fig.
53] In the STOP mode [Fig. 10 ], RVS
When the REV mode is selected, after the rotation of the motor is started, 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 68 are engaged with each other by the movement of the trigger arm 65 driven by this pulse energization to start rotation. At the same time, the reverse arm 18 is also moved toward the outside of the reverse cam 72, and the state is the driving time F of the trigger arm 65.
Since it is longer than that in the WD / CUE mode, the reverse arm 18 wraps outside the reverse cam 72 and enters the reverse state in which it moves along the reverse cam 72 [FIG. 11 ].
Then, with the rotation of the cam gear 68 [12, Fig. 1
3 ], the RVS / PLAY state [Fig. 14 ] is entered once, but the solenoid 6 is again energized for T ₁ second to drive the trigger arm 65, and therefore the cam gear 68.
Does not stop at the PLAY missing tooth portion 69a but continues to rotate by meshing with the next tooth [Fig. 15 ]. As a result, the FR arm 77 is switched to the FF gear 75 side and the FR gear 84 is FFed.
It enters into RVS / REW mode that meshes with the gear 75,
The solenoid 6 is again energized with a pulse of T ₁ second to pull the trigger arm 65, so that the FF / REW projection 66b
And the cam gear 68 continues to rotate further beyond the toothless portion 69b. As a result, the head chassis 2 is sent again to the PLAY position side while the FR gear 84 is meshed with the FF gear 85 without stopping in the RVS / REW mode. The displacement amount of the assist cam 60 at this time, that is, the feeding amount of the head chassis 2 is smaller than during PLAY and larger than during FF / REW. Therefore, the pinch roller 42b does not reach the capstan shaft 53b, and the play gear 55b remains in the state in which the play arm 54b is engaged with the head chassis 2. Only 11 makes light contact with the tape.
Therefore, the REV state is reached in which only the head is pressed against the tape for reproduction while the tape is running in the RVS / REW state [Fig. 19 ].

From STOP mode to FWD / REV mode
To [Refer to FIG. 54 ] F in STOP mode [FIG. 10 ]
When the WD / REV mode is selected, a pulse of T ₁ second is supplied to the solenoid 6 after the rotation of the motor is started. By this pulse energization, the cam gear 68 moves the flywheel gear 7
Then, the rotation of the trigger arm 65 starts and the forward state is established because the driving time of the trigger arm 65 is short [Fig. 26 ]. afterwards,
When the state shown in FIG. 27 is accompanied by 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 and F
Prevents movement of the FF gear 75 side of the R arm 77 [3
8 ], the PLAY mode [FIG. 29 ] is passed, and the rotation is further continued. Cam gear 68 that passed the PLAY position
Moves the FR arm 77 to the left reel gear 82b side by the FR cam 74b, and moves the FR gear 84 to the left reel gear 8b.
It shifts to FWD / REW mode that meshes with 2b,
Since the solenoid 6 is continuously energized, the trigger arm 65 has the FF / REW projection 66b and the toothless portion 69b.
The FWD / REW mode is passed in order to mesh with the next tooth and rotate the cam gear 68 further. By the rotation of the cam gear 68 after that, the assist pin 61 is moved to the CUE-position while the FR gear 77 is meshed with the left reel gear 82b.
The head chassis 2 is moved to the REV position 60c and sent again to the PLAY position side. Then, rewinding playback that makes the tape run faster by rewinding while making a playback sound.
The mode shifts to the review (REV) mode [Fig. 40 ]. still,
The reverse arm 18 continues to be driven by a long energization of the solenoid 6, but it does not shift to the reverse state because it is located inside the reverse cam 72 and is not engaged with the head lever 17.

From STOP to RVS / CUE mode [Figure
54] In the STOP mode [Fig. 10 ], the RVS
When the CUE mode is selected, after the motor starts rotating, the solenoid 6 is energized with a pulse of T ₂ seconds longer than that in the FWD / REV mode. Reverse arm 18 together with the cam gear 68 by the pulse current starts to rotate enters the reverse state moves out of the reverse cam 72 [1
1 ]. After that, as the cam gear 68 rotates [Fig. 27 ].
After the above state, the solenoid 6 is again energized for a relatively long time T ₆ seconds. As a result, the trigger arm 65 is FR
The movement of the arm 77 toward the FF gear 75 side is blocked [Fig. 2
2 ], the RVS / PLAY mode [Fig. 14 ] is entered, but since the solenoid 6 is continuously energized, the cam gear 6
8 does not stop at the PLAY position but continues to rotate further beyond the PLAY projection 66a and the toothless portion 69a. And F
The second FR pin 83b of the R arm 77 is driven by the FR cam 74b to mesh the FR gear 84 with the left reel gear 82b, thereby shifting to the RVS / FF mode. However, since the solenoid 6 is still energized, the trigger arm 65
Causes the cam gear 68 to rotate further beyond the FF / REW projection 66b and the toothless portion 69b to pass the RVS / FF mode. Then, the cam gear 68 is further rotated, the FR arm 77 is fixed while the FR gear 84 is meshed with the left reel gear 82b by the FR cam 74b, and the head chassis 2 is fed toward the PLAY position. This CUE / R
The displacement amount of the assist cam 60 at the EV position 60c, that is, the feed amount of the head chassis 2 is smaller than the PLAY position 60a and larger than the FF / 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 contact the play clutch gear 56.
It does not bite into b, but only the head 11 makes light contact with the tape. Therefore, the RVS / CUE state is reached in which only the head is pressed against the tape for reproduction while the tape is running in the RVS / FF mode state [Fig. 23 ].

From FWD / PLAY mode to FWD / CU
To E mode [Refer to Fig. 55] FWD / PLAY mode [Fig.
29 ], when the FWD / CUE mode is selected,
A pulse of T ₁ second is supplied to the solenoid 6. This pulse energization causes the trigger arm 65 to move the PLAY projection 6
6a, the cam gear 68 meshes with the flywheel gear 7 and starts rotating. By the rotation of the cam gear 68, the amount of cam displacement given to the assist pin 61 gradually decreases, so that the head chassis 2 returns toward the STOP position, and the play arm 54a on the forward side moves to play the play gear 55a. The FWD / PLAY state is released by disconnecting from the clutch gear 56a. Furthermore,
FR cams 74a and 74b with which the second FR pin 83b is engaged
The FR arm 77, the movement of which is restrained, 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.
The state [Fig. 34 ] is entered, but here the solenoid 6 is turned on again.
_Since the pulse for ₁ second is energized to pull the trigger arm 65, the FF / REW projection 69b and the toothless portion 69b
The cam gear 68 is rotated without passing over the FWD / FF position. Then, with the FR gear 84 engaged with the FF gear 85, the CUE / REV position 6 of the assist cam 60 is kept.
The cam displacement of 0c is applied to the head chassis 2 to
Send it toward the Y position. This CUE REV position 6
The displacement amount of the assist cam 60 at 0c, that is, the feed amount of the head chassis is smaller than that at the PLAY position 60a, and FF.
Since it is larger than the REW position 60b, only the head 11 comes into light contact with the tape to be in the FWD / CUE state in which the tape is run and reproduced in the FF state [Fig. 35 ].

From RVS / PLAY mode to RVS / RE
To V mode [Refer to Fig. 55] RVS / PLAY mode [Fig.
14 ], when the RVS / REV mode is selected,
A relatively short T ₁ second pulse is applied to the solenoid 6,
When the trigger arm 65 disengages from the PLAY protrusion 66a and the cam gear 68 meshes with the flywheel gear 7 to start rotation, the head chassis 2 begins to return to the STOP position side, releasing the PLAY state. Further, as the cam gear 68 rotates, the FR arm 77 is switched to the FF gear 75 side to engage the FR gear 84 with the FF gear 75.
Although the S / REW mode is entered, the solenoid 6 is again energized with a pulse for T ₁ second and the trigger arm 65 is pulled, so that it does not stop in the RVS / REW mode beyond the FF / REW projection 66b and the toothless portion 69b. The cam gear 68 is rotated. Then, with the FR gear 84 engaged with the FF gear 75, the CUE / REV position 60 of the assist cam 60 is maintained.
The cam displacement amount of c 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, the RVS / REV state in which the tape is reproduced while the tape is running in the RVS / REW state [Fig. 19 ].

From FWD / CUE mode to STOP mode
[See FIG. 56 ] When the STOP mode is selected in the FWD / CUE mode [FIG. 35 ], the solenoid 6 is turned on.
A relatively short pulse of ₁ second is energized and trigger arm 6
5 disengages from the CUE / REV projection 66c and the cam gear 6
Rotate 8 [Fig. 36 ]. As the cam gear 68 rotates, the first FR pin 83a rides on the FR cam 74d F
In order to swing the R arm 77 to the left reel gear 82b side, the FR gear 84 is separated from the FF gear 85 and the FWD
-Cancel the 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 is fixed to the reel stand 57a, 57 b of the right and left by driving the brake arm 76 [3
6 ]. 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. 37 ] and shifts to the STOP mode [Fig. 10 ].

From FWD / REV mode to STOP mode
To [See FIG. 56 ] When the STOP mode is selected in the FWD / REV mode [FIG. 40 ], the solenoid 6 is turned on.
A relatively short pulse of ₁ second is energized to trigger arm 65
Comes off the projection 66c for CUE / REV and the cam gear 68
Starts to rotate [Fig. 41 ]. At this time, FR arm 77
Since the second FR pin 83b is separated from the FR cam 74b, the tension of the FR belt 87 causes the second FR pin 83b to swing in the direction in which the FR gear 84 is separated from the left reel gear 82b.
Cancel V mode. F disengaged from the left reel gear 82b
The R gear 84 is prevented from moving to the FF gear 75 side by the tension of the FR belt 87 and the engagement of the trigger arm 65, and the FR gear 84 is located at an intermediate position between the left reel gear 82b and the FF gear 75. Retained. Furthermore,
Since the brake arm 73 is driven by the brake cam 73 of the cam gear 68, the left and right reel stands 57a, 57b.
Are fixed [Fig. 41 ]. After that, the assist pin 61 moves on the assist cam 60 as the cam gear 68 rotates.
It moves toward the OP position 60e [Fig. 42 ] and shifts to the STOP mode [Fig. 10 ].

From RVS / CUE mode to STOP mode
[Refer to FIG. 57 ] When the STOP mode is selected in the RVS / CUE mode [FIG. 23 ], the solenoid T ₇
A relatively long pulse of 2 seconds is energized and trigger arm 65
Comes off the projection 66c for CUE / REV and the cam gear 68
Starts to rotate [Fig. 24 ]. 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 FF by trigger arm 65
The left reel gear 82 is prevented from rotating toward the gear 75 side.
The FR gear 84 is held at an intermediate position between b and the FF gear 75. Further, as the brake cam gear 68 rotates, the brake cam 73 drives the brake arm 76 to fix the left and right reel bases 57a and 57b [FIG. 24 ]. After that, as the cam gear 68 rotates, the assist pin 6
1 moves on the assist cam 60 toward the STOP position 60e, but the assist pin 61 moves to the H position of the assist cam 60.
When reaching the OLD position 60d, the reverse pin 78 falls to the HOLD position 79 of the reverse cam 72 to move the reverse arm 18 toward the forward side, and at the same time, the trigger arm 65 is brought into contact with the HOLD projection 66d which also serves as the trigger cam 67. Then, the rotation of the cam gear 68 is stopped. That is, the trigger arm 65 shifts to the HOLD state in which the head chassis 2 is stopped [FIG. 25 ]. After that, the solenoid 6 is de-energized and the trigger arm 65 is stretched between the reverse arm 18 and the spring 9.
Since the force of 6 returns to the original position, the cam gear 68 starts rotating again to move the assist pin 61 to the STOP position 60.
Move to e. . Then, the head chassis 2 is stopped
Return to the position and reverse pin 7 on the reverse cam 72
8 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 a predetermined position in the forward state [Fig.
10 , FIG. 43 ].

From RVS / REV mode to STOP mode
[See FIG. 57)] When the STOP mode is selected in the RVS / REV mode [FIG. 19 ], the solenoid 6 is energized with a relatively long pulse of T ₇ seconds, and the trigger arm 65 is moved from the CUE / REV projection 66c. The cam gear 68 disengages and starts rotating [Fig. 20 ]. With the rotation of the cam gear 68, the first 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 temporarily blocked by the trigger arm 65 from swinging toward the left reel gear 82b, and holds the FR gear 84 at an intermediate position between the left reel gear 82b and the FF gear 75. Further, the brake cam 73 drives the brake arm 76 to fix the left and right reel stands 57a and 57b [FIG. 20 ]. After that, the assist pin 61 moves on the assist cam 60 toward the STOP position 60e as the cam gear 68 rotates.
HOLD where the assist pin 61 is stopped at the D position 60d
Enter the state [Fig. 21 ], and stop the movement of the head chassis 2 and the head lever 17 with the assist pin 61, and then ST
The acceleration when returning to the OP position is reduced. Thereafter, the solenoid 6 is de-energized and the trigger arm 65 returns to its original position by the force of the spring 96, so that the cam gear 68 starts rotating again to move the assist pin 61 to the STOP position 60e and the reverse cam 72. The upper reverse pin 78 is dropped from the HOLD position 79 to the STOP position. As a result, the mode shifts to the STOP mode [Fig. 10 ].

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.

[0054]

As is apparent from the above description, in the tape recorder control mechanism of the present invention, the assist pin is a two-step pin having a smaller diameter portion on the tip side than on the root side, and the cam contour of the assist cam is the basic circle. A small step on the tip side of the assist pin is provided when the cam displacement given by the assist cam is small because there is a step in the vicinity that slides in contact with the small diameter part of the assist pin and in the part away from the basic circle slides in the large diameter part of the assist pin. The portion follows the assist cam, and when the cam displacement is large, the large diameter portion on the base side of the assist pin follows the cam contour of the assist cam. Therefore, when the spring load in the play mode or the like or the reaction force from the capstan or the like is large, the cam displacement is given by the sturdy large diameter portion, and when the spring load is relatively small immediately before the stop position or the like, the small diameter portion abuts. Increase the angle corresponding to the slope required to roll the pin. Since the spring load is small at the stop position and the hold position immediately before it, even if the assist pin is thin, it can sufficiently withstand. Therefore, even in the vicinity of the basic circle, the ratio of the rotation angle of the cam gear to the displacement amount of the cam is reduced to facilitate control, and complicated control is possible with the assist cam having a limited size.

[Brief description of the drawings]

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

FIG. 2 is a 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 rotation mechanism of FIG.

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

FIG. 6 is a schematic diagram showing the structure of a reverse recording tape recorder incorporating the control mechanism of the present invention.

[7] a diagram showing a relation between gears and cams or the like of the tape recorder shown in FIG. 6, (a) is a schematic view, (b) is a sectional view showing the relationship between the assist pin and the assist cam, (c) is the same pin It is a perspective view of a cam.

FIG. 8 is a diagram showing a positional relationship of gears, cams and the like in FIG . 7 as viewed from the opposite direction.

FIG. 9 is an exploded perspective view showing an exploded head chassis and a rotary head mechanism of the tape recorder.

FIG. 10 is a gear mechanism diagram showing a STOP mode state of the tape recorder.

FIG. 11 is a gear mechanism diagram showing a reverse selection state.

FIG. 12: 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. 13 is a gear mechanism diagram showing a state where the RVS / PLAY mode is selected.

FIG. 14 is a gear mechanism diagram showing an RVS / PLAY mode.

FIG. 15 is a gear mechanism diagram showing a state at a branch point where the RVS / PLAY mode is switched to the STOP mode or the RVS / REV mode.

FIG. 16 is a gear mechanism diagram showing a state in which the STOP mode is selected from the RVS / PLAY mode.

FIG. 17 is a gear mechanism diagram showing a state in which the reel base is braked when the RVS / PLAY mode is shifted to the STOP mode.

FIG. 18 is a gear mechanism diagram showing a holding state when shifting from the RVS / PLAY mode to the STOP mode.

FIG. 19 is a gear mechanism diagram showing an RVS / REV mode state.

FIG. 20 is a gear mechanism diagram showing a brake state when shifting from the RVS / REV mode state to the STOP mode.

FIG. 21 is a gear mechanism diagram showing a holding state when shifting from the RVS / REV mode state to the STOP mode.

FIG. 22 is a gear mechanism diagram showing a state at a branch point where the FF mode is selected on the reverse side.

FIG. 23 is a gear mechanism diagram showing an RVS / CUE mode.

FIG. 24 is a gear mechanism diagram showing a brake state at the time of shifting from the RVS / CUE mode to the STOP mode.

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

FIG. 26 is a gear mechanism diagram showing an FWD / PLAY selection state.

FIG. 27 is a gear mechanism diagram showing a state at a branch point for selecting the REW mode and the FWD / PLAY mode.

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

FIG. 29 is a gear mechanism diagram showing an FWD / PLAY state.

FIG. 30 is a gear mechanism diagram showing a transition start state from FWD / PLAY mode to STOP mode.

FIG. 31 is a gear mechanism diagram showing a further advanced state thereof.

FIG. 32 is a gear mechanism diagram showing a braking state when shifting from the FWD / PLAY mode to the STOP mode.

FIG. 33 is a gear mechanism diagram showing a state immediately before switching to the STOP mode.

FIG. 34 is a gear mechanism diagram showing an FF mode state.

FIG. 35 is a gear mechanism diagram showing an FWD / CUE mode state.

FIG. 36 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. 37 is a gear mechanism diagram showing a state immediately before the STOP mode.

FIG. 38 is a gear mechanism diagram showing a state where a REW mode is selected.

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

FIG. 40 is a gear mechanism diagram showing an FWD / REV mode state.

FIG. 41 is a gear mechanism diagram showing a brake operating state during a transition from the FWD / REV mode to the STOP mode.

FIG. 42 is a gear mechanism diagram showing a state immediately before the STOP mode.

FIG. 43 is a plan view for explaining the movement of the head chassis in the STOP mode.

FIG. 44 is a plan view for explaining the movement of the head chassis in the RVS / PLAY mode.

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

FIG. 46 is a plan view for explaining the movement of the head chassis in the FWD / PLAY mode.

FIG. 47 is a plan view for explaining the movement of the head chassis in the FF mode.

FIG. 48 is a time chart showing the movement of the solenoid and the arms associated therewith when switching from the STOP mode to the FWD / PLAY or RVS / PLAY mode.

FIG. 49 FWD / PLAY or RVS / PLAY
It is a time chart which switches from a state to a STOP mode.

FIG. 50 is a time chart of switching from STOP mode to FF mode.

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

[FIG. 52] STO from FF mode or REW mode
6 is a time chart for switching to a P mode.

FIG. 53 is a time chart of switching from STOP mode to FWD / CUE mode or RVS / REV mode.

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

FIG. 55: FWD / PLAY state to FWD / CUE mode or RVS / PLAY state to RVS / RE
6 is a time chart for switching to a V mode.

FIG. 56 is a time chart of switching from FWD / CUE mode to STOP mode or from FWD / REV mode to STOP mode.

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

FIG. 58 is a central vertical cross-sectional view showing an example of a drive gear.

FIG. 59 is a vertical sectional view showing another embodiment of the pinch arm.

FIG. 60 is an exploded perspective view of the pinch arm shown in FIG . 59 .

FIG. 61 is a perspective view showing an example of a control mechanism of a conventional tape recorder.

[Explanation of symbols]

 60 Assist cam 60a PLAY position 60b FF / REW position 60c CUE / REV position 60d Hold position 60e Stop position 61 Assist pin 61a Large diameter part 61b Small diameter part

Claims (1)

(57) [Claims] 1. A drive gear that rotates together with a motor,
A tape provided with a cam gear having a toothless portion and meshing with the drive gear, an assist cam driven by the cam gear, and an assist pin for slidingly contacting the assist cam and moving a head chassis having a magnetic head mounted thereon. In the control mechanism of the recorder, the assist pin is a two-stage pin having a small diameter portion on the tip side and a large diameter portion on the root side, and the assist cam has a cam contour whose small contour is near the base circle of the cam. A tape recorder control mechanism characterized by having a step in sliding contact with the base circle and a step in sliding contact with the large diameter portion of the assist pin.