JPH0520738A - Control mechanism for tape recorder - Google Patents

Abstract

(57) [Summary] [Purpose] To enable complicated control with a limited-sized cam without increasing the size of the assist cam and without thinning the assist pin at a site where the cam displacement is large. [Structure] The assist pin 61 has a tip side 61b at the base side 6
A two-stage pin with a diameter smaller than 1a, and an assist cam 6
A step 58, in which the cam contour of 0 is in sliding contact with the small diameter portion 61b of the assist pin 61 in the vicinity 86 of the basic circle, and in sliding contact with the large diameter portion 61a of the assist pin 61 at a site apart from the basic circle.
Is provided, and when the cam displacement given from the assist cam 60 is small, the small diameter portion 61b on the tip end side of the assist pin 61 is provided.
Follows the assist cam 60, and when the cam displacement is large, the large-diameter portion 61a on the base side of the assist pin 61 follows the cam contour of the assist cam 60.

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 an improvement of a tape recorder control mechanism that includes an assist cam and an assist pin that move a head chassis and the like by using rotation of a motor when switching.

[0002]

2. Description of the Related Art Conventionally, as a control mechanism for driving a head chassis or the like by utilizing the rotation of a motor, for example, FIG.
As shown in FIG. 4, 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 concave portion 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 carried out by slightly rotating the cam gear 104 by using the movement of a solenoid (not shown) as a trigger. 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 close to 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 more advantageous to slow the movement of the head chassis and reduce the impact by making the inclination for moving the distance of 1 by 2 smaller.

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, in a limited space, one cam cannot perform complicated control. 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 limited by space.
Especially in the case of a reverse type tape recorder, the assist cam 1
When 01 is arranged 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 enlarged. Moreover, if the assist pin 102 has a small diameter in order to drive 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 like during play, 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.

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-step 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 diameter portion is near the base circle of the cam. The stepped portion is in sliding contact with the base circle and has a stepped portion 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 part 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 part 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 in the play mode is relatively large and the reaction force from the spring load or the capstan 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 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 structure of the present invention will be described in detail below with reference to the embodiments shown in the drawings. The present embodiment is applied to an auto-reverse recording tape recorder that employs a mode switching mechanism that switches to each operation mode by using the operation of one electrically operated solenoid and the rotational force of a motor.

This tape recorder has a rotary head mechanism 1 for rotatably supporting a head, a head chassis 2 for mounting the rotary head mechanism 1, 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 drives the solenoid 6 to be pulsed so that the cam gear 68 meshes with the flywheel gear 7 that rotates in conjunction with the motor to rotate the head chassis 2 and the FR cam 7 as well.
4a, 74b, 74c, 74d and the movement of the trigger arm 65 are configured to control the movement of the FR arm 77 to switch the mode. The motor serving as a drive source and the flywheel gear 7 are connected by stretching a main belt 10 between a motor pulley 8 and a flywheel 9. Also, FR is coaxial with the flywheel 9.
A pulley 4 that is connected to the pulley 85 via an FR belt 87 and a pinion 5 that meshes with the play gear 55a on the forward side are provided. Further, the flywheel 3 serving as a rotation source on the reverse side is provided so as to be rotated by being brought into contact with the main belt 10 stretched around the flywheel 9 on the forward side. A pinion 3a is coaxially formed on the flywheel 3.

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

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

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

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

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

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

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

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

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

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

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

The head chassis 2 has an assist pin 61 which penetrates the chassis and engages with an assist cam 60 arranged on the opposite side. The assist pin 61 slides on the assist cam 60 to move the cam displacement to the head chassis 2
It is a cam follower that is transmitted to. The assist pin 61 of this embodiment is a two-step pin having a large diameter portion 61a and a small diameter portion 61b. Then, the assist cam 60 moves to the hold position 6
In the area 86 where the cam contour approaches the vicinity of the base circle, such as 0d and the stop position 60e, the small-diameter portion 61b abuts the assist cam 60, and other mode positions 60 other than it
The large diameter portion 61a is formed so as to abut on a, 60b, 60c and its intermediate path. This is to make the movement of the head chassis and the reverse switching mechanism quiet when changing from each operation mode to the stop mode, and therefore, with the assist pin 61 on the inclined surface of the assist cam 60, near the stop position 60e of the assist cam 60. This is because it is preferable to move the head chassis 2 to the upper position, that is, to control the movement of the head chassis 2 by the assist cam 60.
However, since the center of the assist cam 60 is approached, the angle for inclining the assist cam 60 with respect to the diameter of the assist pin 61 becomes large. Further, when the diameter of the assist pin 61 is large, the rotation angle of the assist cam 60 with respect to the assist pin 61 is large. Therefore, the assist pin 1
It is advantageous to make the inclination for moving the distance for each piece gentler in order 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, assisting by the spring load of the return coil spring 51 when the distance from the center of the cam becomes long as in play. The pin 61 may be broken. On the other hand, since the spring load is small at the stop position 60e and the hold position 60d immediately before it, even if the assist pin 61 is thin, it can sufficiently endure. Therefore, in order to make it strong when the spring load in the play mode is large and to increase the angle corresponding to the slope required to roll the pin immediately before the stop position, as shown in (b) and (c) of FIG. 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 base circle in the vicinity thereof, the cam surface is made thinner in the axial direction than other portions, and is formed only at a position corresponding to the small diameter portion 61b of the assist pin 61 to assist. The 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.
It is always urged by 1 to move toward the center of the assist cam 60. The assist arm 62 is rotatably attached to the head chassis 2 with a rotating shaft 63, and is pressed in a fixed position by a strong coil spring 64 stretched between the assist arm 62 and the head chassis 2. It is fixed to. Therefore,
Normally, the assist arm 62 moves integrally with the head chassis 2, but absorbs an overlock at the play position by the cam 60 (the maximum stroke before the play but the head stops at a predetermined position). .

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

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

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

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

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

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

The FR arm 77 is rotatably attached to a support shaft 88 on the chassis, and its movement is restricted by the FR cams 74a, 74b, 74c and 74d on the cam gear 68. Cam gear 68 of this FR arm 77
An engaging claw 89 that engages with the trigger arm 65 is formed at the tip of the side protruding upward. The lower end of the pin 90 that supports 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. 12, the FR gear 84 is fitted on the bearing sleeve 91 integrally formed with the FR pulley 85 and conductive plastic. The FR gear 84 is rotatably fitted on the bearing sleeve 91, and is pressed toward the FR pulley 85 by the coil spring 93 via the felt disk 92 forming the friction clutch. Coil spring 9
3 is a flange 94 fixed to the tip of the bearing sleeve 91.
And the FR gear 84, and is provided so as to press the FR gear 84 against the FR pulley 85 via the felt disc 92. Therefore, when a force of a certain magnitude or more is generated between the FR pulley 85 and the FR gear 84, the FR pulley 85 and the FR gear 84 slip with each other and the rotation transmission relationship is interrupted. Further, the pin 90 and the FR pulley 85 are electrically connected via a conductive bearing sleeve 91. Therefore,
Static electricity generated during rotation between the FR belt 87 and the FR pulley 85 is grounded to the chassis via the FR pulley 85, the bearing sleeve 91, and the pin 90. As a result, the CPU of the control computer and the like can be protected from electrostatic discharge and malfunction can be prevented. Furthermore, FR pulley 8
Since 5 is arranged almost at the center of the bearing sleeve 91 and is integrally formed, it is possible to reduce the bending of the FR belt 87 portion hung on the FR pulley 85, and the fluctuation of the tension of the FR belt 87, that is, the rotation of the FR belt 87. It is possible to reduce unevenness and improve the reduction of wow and flutter.

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

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

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

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

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

[0035]From STOP mode to FWD / PLAY mode
Dohe [See Figure 11A]  FWD in STOP mode [Fig. 9A1 and 10A1]
・ Starts motor rotation when PLAY mode is selected
After that, T on the solenoid 6₁The second pulse is energized. this
The trigger arm 65 is pulled by the pulse energization.
The protrusion 66d that is in contact with the trigger arm 65
At the same time when the engagement is released, the trigger cam 67 is contacted.
The cam gear 68 is slightly fed in the rotating direction. By this
The flywheel gear 7 and the cam gear 68 mesh and rotate.
Start rolling. At the same time, the reverse arm 18 also reverse cams.
The trigger arm can be moved to the outside of 72.
Since the driving time of 65 is short, the reverse arm 18
It returns to its original position with the movement of the rigger arm 65. others
Therefore, the reverse pin 78 of the reverse arm 18 is reverse.
Go inside the cam 72 and move the inside of the reverse cam 72.
It becomes a moving forward state [Fig. 9D2]. Then cam
The first FR pin of the FR arm 77 according to the rotation of the gear 68
83a rises to the FR cam 74c and the FR gear 84 moves to the left.
It is slightly sent to the gear 82b side. However, the second FR
FR gear 84 is on the left
It does not reach the point where it meshes with the reel gear 82b [Fig. 9D.
3]. After that, the first FR pin 83a of the FR arm 77
When the FR arm 77 falls free from the FR cam 74c,
Therefore, the FR belt 8 hung on the FR pulley 85
Due to the tension of 7, the FR arm 77 is centered by the cam 74a.
Return to the upright position [Fig. 9D4]. Furthermore, rotation advances and FR arm
The second FR pin 83b of the 77 is the FR cam 74a and the FR cam.
74b, the movement of the FR arm 77 is restricted.
The PLA with the FR gear 84 fixed in the neutral position.
The toothless portion 69a for Y comes to the position of the flywheel gear 7.
Therefore, the transmission of rotation to the cam gear 68 is blocked [Fig. 9D.
Five]. At this time, the assist pin 61 moves to the assist cam 60.
PLAY position 60 slightly lower than the maximum displacement position of
It is located at a and the head chassis 2 is the most advanced
It will be in a state of being. Then, the tip of the trigger arm 65 and the cover
The PLAY projection 66a of the Mugear 68 comes into contact with the cam gear.
The rotation of A68 is blocked. The cam gear 68 is an assist pin.
Return coil spring 5 biased via
With the spring force of 1, there is no pressing of the trigger arm 65
If so, it is in a state of trying to rotate. At this time, the head
The lever 17 is inside the reverse cam 72 of the reverse arm 18.
Move to the forward side on the right side of the figure.
And the guide claw 3 on the reverse side of the head lever 17
9b engages the play arm 54b on the reverse side to
The movement is restricted, and the reverse side play gear 55b plays.
It is provided so as not to mesh with the clutch gear 56b.
It Further, the reverse side operation claw 40b of the head lever 17
Also shifts from the pinch arm 43b, so
The spring 49b for punch pressure to move the head chassis 2.
Therefore, it is not pressed and the reverse side capster
The tape is not pressed against the shaft 53b. And
At this time, the head chassis 2 is most fed
Forward side and reverse side play arms 54a, 5
When the engagement between 4b and the head chassis 2 is released respectively,
The operating claw 40a on the forward side of the head lever 17
The pinch pressure spring 49a is pushed and the pinch low
When the la 42a is pressed against the capstan shaft 53a,
Play through the play arm actuating spring 50a
Rotate the arm 54a to the play clutch gear 56a side
[Fig. 10D5]. This makes the pinch on the forward side
The roller 42a pushes the tape against the capstan shaft 53a.
Play gear 55a is play clutch
FWD / PL that rotates the reel that meshes with the gear 56a
It becomes AY mode [Fig. 9D5].

[0036]From STOP mode to RVS ・ PLAY mode
[Refer to FIG. 11A]  In STOP mode [Fig. 9A1], RVS PLAY mode
Mode is selected, the motor will rotate as shown in Figure 11A.
After the start of rotation, the solenoid 6 is turned on as shown by the broken line.₂Second power
Ruth is energized. This pulse energization triggers
Since the arm 65 is pulled, it abuts the trigger arm 65.
The engagement with the existing STOP projection 66e is released, and at the same time
Push the trigger cam 67 to send the cam gear 68 in the rotation direction.
The flywheel gear 7 and the cam gear 68 are engaged with each other.
It At the same time, the reverse arm 18 is also outside the reverse cam 72.
It is moved toward the side and the state is the trigger arm 6
Driving time of 5 is longer than in FWD / PLAY mode
Therefore, the reverse arm 18 is located outside the reverse cam 72.
The reverse state that moves along the wraparound reverse cam 72
[Fig. 9A2, Fig. 9A3]. After that, rotation of the cam gear 68
As a result, the first FR pin 83a of the FR arm 77 is
The FR gear 84 rides on the vehicle 74c and the left reel gear 82b
Slightly sent to the side. However, the second FR pin 83b is free
Is in a state of being pulled by the FR belt 87.
Therefore, until the FR gear 84 meshes with the left reel gear 82b.
It does not reach [Fig. 9A3]. Then, turn the cam gear 68
As a result, the first FR pin 83a is removed from the FR cam 74c.
Therefore, the FR gear 84 is
Are pulled back and placed in a neutral state [Fig. 9A4]. In addition,
The rotation of the Mugear 68 progresses, and the second FR pin 83b becomes the FR cover.
The FR arm 7 is guided between the cam 74a and the FR cam 74c.
When the movement of No. 7 is restricted, the FR gear 84 is locked in the neutral position.
In the fixed state, the toothless portion 69a for PLAY flywheel
Transmission of rotation to the cam gear 68 to reach the position of the Lugear 7
Is cut off. At this time, the FWD / PLAY mode described above
The only difference is the reverse arm 18 and the reverse cam 72.
And the head lever 17 moves to the reverse side.
The guide claw 39a on the forward side is
The play gear 55 by engaging with the arm 54a to regulate its movement.
a is prevented from being caught in the play clutch gear 56a.
The forward side actuating claw 40a to the pinch pressure spring
The head chassis 2 is moved from the position 49a and is moved by the movement of the head chassis 2.
Attach the pinch roller 42a on the forward side to the capstan shaft 53.
I try not to press it against a. And
The operation lever 40b on the reverse side of the door lever 17 is used to
Pinch roller 42b by pushing the punch pressure spring 49b.
While pressing the capstan shaft 53b against the play
The play gear 55b is rotated by rotating the arm 54b.
The pinion 3 on the reverse side is meshed with the hitch gear 56b.
RVS PL that rotates the left reel 57b by a
It becomes the AY mode [FIG. 9A5 and FIG. 10A5].

[0037]Stop mode from FWD / PLAY mode
To [[See Figure 11B]  In FWD / PLAY mode [Fig. 9D5 and Fig. 10D5]
When the STOP mode is selected by pressing the₁
The second pulse is energized. This allows the trigger arm
For PLAY where the cam 65 blocks the rotation of the cam gear 68
A cam gear that is disengaged from the protrusion 66a and is caused by the assist pin 61
Allow 68 rotations. This makes the flywheel
A 7 passes over the cam gear 68 and the PLAY missing tooth portion 69a
The cam gear 68 is engaged by the rotation force of the motor.
[Fig. 9D6]. At this time, the FR arm 77 is moved to the FR cam 7
The second FR pin 83b is provided between the 4a and the FR cam 74b.
Is restricted in its movement, the FR cams 74a, 7
Although FR arm 77 swings along 4b, FR gear 8
4 meshes with the left reel gear 82b or the FF gear 75
I don't care. Also, the reverse arm 18 can also be triggered.
It moves for a moment by driving the arm 65, but reverses again.
Move the head lever 17 to return to the inside of the cam 72.
Never. Furthermore, the head chassis 2 is the original STOP
The pinch pressure spout on the forward side
Actuating claw of the head lever 17 pressing the ring 49a
40a also retreats and pinch-lows to the capstan shaft 53a.
The pressing of the la 42a is also released and the play arm 4
The bias to 3a is also released, and play gear 55a and play
The engagement with the latch gear 56a is also released, and the reel base 57a is reached.
Rotation transmission is stopped. After that, FR arm 77
Swing the crab FR gear 84 toward the left reel gear 82b.
The solenoid again.₃Relatively long passage of seconds
Electricity is delivered. As a result, the trigger arm 65
Continue to drive [Fig. 9D7], flywheel gear 7 is FF
The next tooth of the cam gear 68 beyond the REW toothless portion 69b
Mesh with. As a result, the cam gear 68 is in the FF mode.
The rotation of the assist pin 61 continues without stopping at
Kick Then, the brake arm 73 is attached to the brake cam 73.
The driven protrusion 81 of the
Then, attach the latches at the tips to the left and right reel gears 82a, 82a.
and the left and right reel stands 57a and 57b
Fix it [Fig. 9D9]. At the same time, the trigger arm 65 is pulled.
FR arm 77 triggers because it remains in the opened state.
-Fixed by arm 65, left reel gear 82b side
It is fixed so as not to move to. Then solenoid 6
When the power supply to the
And the assist pin 61 passes through the HOLD position 60d.
To the STOP position 60e, and the cam gear 68 is STOP
Rotate to the P mode position [Fig. 9A1 and Fig. 10A1].

[0038]From RVS / PLAY mode to STOP mode
To [[See Figure 11B]  In RVS / PLAY mode [Fig. 9A5], STOP
Mode is selected, it is the same as in FWD / PLAY mode.
Similarly, the solenoid 6 has a T₁The second pulse is energized. This
As a result, the trigger arm 65 operates and the cam gear 68
PLAY protrusion 66a and trigger that prevent rotation
The engagement with the arm 65 is released and the assist pin 61 is used.
The rotation of the cam gear 68 is allowed [Fig. 9A6]. By this
The flywheel gear 7 is missing the cam gear 68 and PLAY.
It meshes beyond the teeth 69a, and the rotational force of the motor causes
The Mugia 68 is rotated. At this time, FR arm 77 is F
Between the R cam 74a and the FR cam 74b, the second FR pin
FR cam 7 because its movement is restricted.
FR arm 77 swings along 4a and 74b, but FR
The gear 84 does not mesh with the left reel gear 82. Well
The reverse arm 18 moves to the reverse cam 72.
Is regulated, so it is constant along the displacement of the reverse cam 72.
Make a move. Furthermore, the head chassis 2 is returned to its original position.
The reverse side pinch pressure spring 49
The operating claw 40b of the head lever 17 that was pressing b is also rear
Of the pinch roller 42b to the capstan shaft 53b.
Pressing is also released and urging to play arm 54b
Is also released, and the play clutch gear 5 of the play gear 55b is released.
The engagement with 6b is also released, and the rotational force to the left reel stand 57b
Grant is stopped. After that, the FR arm 77 is slightly F
When the R gear 84 is swung toward the left reel gear 82b
The T solenoid 6 again₃It is energized for 2 seconds. By this
Then, the trigger arm 65 continues to be driven, and the cam gear 6
8 overcame the FF / REW toothless portion 69b to RVS /
In REW mode, it does not stop and meshes with the next gear surface for rotation
Continue [Fig. 9A7]. Then, the brake cam 73
The driven protrusion 81 of the key arm 76 rides up to the brake gear.
The latch of the frame 76 to the left and right reel gears 82a and 82b.
The left and right reel bases 57a and 57b are fixed by biting them in respectively.
Set [Fig. 9A9]. At the same time, the trigger arm 65 is pulled
The FR arm 77 is not
Fixed by the arm 65 and moved to the left reel gear 82b side.
It is fixed so that it does not move. After that, reverse arm 1
8 reverse pin 78 is the holding position of the reverse cam 72
(Hereinafter referred to as “HOLD position”)
The rigger arm 65 engages with the trigger cam 67,
Keep the top pin 61 in the HOLD position 60d of the Assist cam 60.
Hold [Fig. 9A10]. After that, the power to the solenoid 6 is turned on.
When released, the birds pulled by the solenoid 6
The gar arm 65 returns to its original position and the assist pin 61 is used.
Then, the cam gear 68 is rotated. And the cam gear 68
Abuts the trigger arm 65 and the STOP projection 60e.
And rotate the reverse cam 72
Drop reverse pin 78 from position 79
Free the frame 18. This allows the head lever
17 is moved to its original position or forward by the force of the spring 36.
Move to the card state. Then, shift to STOP mode
[FIG. 9A1 and FIG. 10A1].

[0039]From STOP mode to FF mode [Fig. 11
See C]  FF mode is selected in STOP mode [Fig. 9A1].
Then, after the motor starts rotating, the T₁Second power
Ruth is energized. This pulse energization triggers
The cam 65 is pulled to the flywheel gear 7 by pulling the arm 65.
8 is meshed and rotated by a motor. Trigger
The reverse arm 18 driven by the arm 65
Trigger arm due to short drive time of rigger arm 65
With the movement of 65, it returns to the inside of the reverse cam 72 again.
It becomes the forward state [Fig. 9D2]. After that, cam gear 6
After going through the state of [Fig. 9D3] with the rotation of 8, the FR bell
FR arm 77 and FF gear 75
It returns to an intermediate position with the left reel gear 82b [Fig. 9D4]. So
Then, the PLAY mode [Fig.
9D5], the reel side 57a on the forward side turns
The pinch roller 42a is rotated and the capstan shaft 53 is rotated.
Trigger by energizing the solenoid 6 while making contact with a.
The cam gear 68 is moved to the PLAY position by driving the arm 65.
Continue to rotate while engaging with the next tooth [Fig. 9D
6]. Then, the next FF / REW toothless portion 69b is reached.
When the tip of the trigger arm 65 is
Rotation of the cam gear 68 by contacting the F / REW projection 66b
Stop. At this time, the FR arm 77 has the second FR pin 83.
b is introduced between the FR cams 74a and 74b to rotate,
The FR gear 84 is meshed with the FF gear 75. By this
Then, the rotation of the FR gear 84 is rotated to the right via the FF gear 75.
The pinch roller 42a is transferred to the gear 82a.
Only rotate the reel stand 57a without touching the stun shaft 53a.
Fast forward (FF) mode [Figure 9E5 and Figure 10E
Five].

[0040]From STOP mode to REW mode [Fig. 1
See 1D]  REW mode selected in STOP mode [Fig. 9A1]
Then, as shown in FIG. 11D, after the rotation of the motor is started,
T on solenoid 6₁The second pulse is energized. This pal
The trigger arm 65 is pulled by energizing the flywheel.
The ear gear 7 and the cam gear 68 mesh with each other and start rotating.
It The reverse arm 18 drives the trigger arm 65.
Since the time is short, the trigger arm 65 moves again
It returns to the inside of the scum 72 and enters the forward state [Fig.
9D2]. Then, as the cam gear 68 rotates [Fig. 9D
3] state is reached, but here the solenoid is turned on again._FourSeconds
Power is supplied. This moves the trigger arm 65
It moves and engages with the FR arm 77, and the FF of the FR arm 77
Continues to block movement to the gear 75 side during energization [Fig. 9F
Four]. At this time, as the cam gear rotates, the PLAY mode is
Rotate the right reel stand 57a to enter the drive [Fig. 9D5]
At the same time, contact the pinch roller 42a with the capstan shaft 53a.
Although it is in contact, the trigger arm is energized by energizing the solenoid 6.
The cam gear 65 is in the PLAY position because the drive of the cam 65 is long.
To the next tooth beyond the PLAY missing tooth portion 69a.
Continue meshing rotation. As the cam gear 68 rotates,
The second FR pin 83b moves along the FR cam 74b.
FR arm 77 is rotated to the left reel gear 82b side in order to
Then, the FR gear 84 is meshed with the left reel gear 82b. So
Then, the cam gear 68 reaches the FF / REW toothless portion 69b.
When it is done, the trigger arm 65 has a protrusion 66 for FF / REW.
The rotation of the cam gear 68 is stopped by coming into contact with b. to this
Therefore, the rotation of the FR gear 84 is transmitted to the left reel gear 82b.
Reach the pinch roller 42a to the capstan shaft 53a
Rewind by rotating only the left reel stand 57b without hitting (R
The EW) mode is entered [Fig. 9F5].

[0041]From FF mode to STOP mode [Fig. 11
See E]  STOP mode is selected in FF mode [Fig. 9E5].
Then, as shown in FIG. 11E, the solenoid 6 is turned on._FiveSeconds
A relatively long pulse is energized. This will trigger
-The arm 65 is disengaged from the FF / REW projection 66b.
The cam pin 68 is allowed to rotate by the cyst pin 61.
As a result, the cam is passed over the FF / REW toothless portion 69b.
The gear 68 meshes with the flywheel gear 7 to rotate the motor.
The cam gear 68 is rotated by the rolling force. Cam gear 68
The cue / rev toothless portion 69c flies with the rotation of the
Even when the position of the wheel gear 7 is reached, it is still
Since the id 6 is energized, the trigger arm 65 is C
Assist without hitting the UE / REV protrusion 66c
By the movement of the top pin 61, the toothless portion 69 for CUE / REV
Go over c, mesh with the next tooth, and continue to rotate. F
The first FR pin 83a of the R arm 77 is moved by the cam 74d.
If the FR arm 77 is separated from the FF gear 75, it will be slightly delayed.
The second FR pin of the FR arm 77 is rotated along with the rotation of the Mugear 68.
83b is also pushed by the FR cam 74a and the FR arm 7
7 is moved away from the FF gear 75. By this
FR gear 77 is disengaged from FF gear 75 and the right reel stand
The transmission of rotation to 57a is cut off and the FF mode is released.
It Then, as the cam gear 68 rotates, the CUE / RE
The V toothless portion 69c reaches the position of the flywheel gear 7.
However, the solenoid 6 is still energized.
Therefore, the trigger arm 65 has the projection 66c for CUE / REV.
By the movement of the assist pin 61 without hitting the
Go over the CUE / REV missing tooth portion 69c and mesh with the next tooth
Continue to rotate further without stopping at FWD / CUE position
It After that, the brake arm 73 is attached to the brake cam 73.
The driven protrusion 81 rides up and drives the brake arm 76.
To secure the left and right reel stands 57a, 57b [Fig. 9E
9]. After that, when the power supply to the solenoid 6 is stopped,
The trigger arm 65 returns to the original position, and STOP / HO
With the flywheel gear 7 in the LD toothless portion 69d
The disengaged cam gear 68 receives the force of the assist pin 61.
Therefore, it rotates [Fig. 9E10] and the trigger arm 65 becomes ST.
When contacting the OP protrusion 66e, the rotation is stopped and the STO
Shift to P mode [Fig. 9A1].

[0042]From REW mode to STOP mode [Fig. 1
See 1E]  Stop mode selected in REW mode [Fig. 9F5]
Then, the FF mode is switched to the STOP mode.
As in the case of_FivePal relatively long in seconds
Is energized to rotate the cam gear 68, which causes the FWD
After passing through the REV mode position [Fig. 9F8], FR gear 8
4 from the left reel gear 82b, and then the brake gear
The brake cam 73 to activate the
Fix the bases 57a and 57b [Fig. 9F9]. afterwards,
Power supply to the solenoid 6 is stopped, and STOP / HOLD
It is disengaged from the flywheel gear 7 by the toothless portion 69d.
The cam gear 68 hits for STOP by the force of the assist pin 61.
Rotate until the trigger arm 65 hits the raising 66e [Fig.
9F10], and then shifts to STOP mode [Fig. 9A
1].

[0043]From STOP mode to FWD, CUE mode
To [See Figure 11F]  FWD, CUE mode in STOP mode [Fig. 9A1]
Mode is selected, the solenoid 6 is activated after the motor starts rotating.
T₁The second pulse is energized. This pulse energization
The trigger arm 65 is pulled and the flywheel gear 7
The cam gear 68 meshes and starts rotating. Reverse at the same time
Also move the arm 18 toward the outside of the reverse cam 72.
However, due to the short drive time of the trigger arm 65,
Inside the reverse cam 72 with movement of the rigger arm 65
Return to the forward state [Fig. 9D2]. Then cam
The state of [Fig. 9D3 and 9D4] accompanying the rotation of the gear 68
After that, once enter FWD / PLAY mode [Fig. 9D5]
But again to solenoid 6₁Second pulse is energized
Since the trigger arm 65 is driven, the cam gear 68 moves to P
Next to the cam gear 68 without stopping at the LAY toothless portion 69a,
It keeps rotating by meshing with the teeth. This allows the FR arm
77 is switched to FF gear 75 side and FR gear 84 is FF
Transition to FWD / FF mode state that meshes with gear 85
However, the solenoid 6 is energized again and the trigger arm
Since 65 is pulled, it exceeds the FF / REW projection 66b.
Rotate the cam gear 68 by the force of the assist pin 61.
And meshes with the next tooth of the cam gear 68. by this,
The motor does not stop in FWD / FF mode and the rotation of the motor causes the cam to move.
The gear 68 is rotated to engage the FR gear 84 with the FF gear 85.
Assist pin 61 again while keeping the head chassis 2
Send it to the play position side. Assist cam 60 at this time
Of the PLA, that is, the feed amount of the head chassis 2 is PLA.
Smaller than Y, pinch roller 42a is capstan
The movement of the play arm 43a does not come into contact with the shaft 53a.
Block and play gear 55a is play clutch gear 56a
To prevent it from meshing with the head 11
It is about contact. Therefore, while playing
Fast forward playback / cue to run the tape by fast forward
(CUE) state [FIG. 9E8]. The reverse arm
18 is driven every time the solenoid 6 is driven,
Is located inside the cam 72 and engages the head lever 17.
Immediately return to the original position because it is not.

[0044]From STOP to RVS / REV mode [Fig.
See 11F]  RVS / REV mode in STOP mode [Fig. 9A1]
Mode is selected, the solenoid is turned on after the motor starts rotating.
T longer than FWD / CUE₂Second pulse is energized
It Trigger arm driven by this pulse energization
By the movement of 65, the flywheel gear 7 and the cam gear 6
8 and 8 mesh and start rotation. Reverse arm 1 at the same time
8 is also moved toward the outside of the reverse cam 72,
Indicates that the drive time of the trigger arm 65 is FWD / CU.
Because it is longer than in E mode, the reverse arm 18
It goes around the outside of the reverse cam 72,
It is in a reverse state where it moves along [Fig. 9A2]. After that,
The state of [Fig. 9A3, Fig. 9A4] is changed with the rotation of Mugear 68.
After that, it enters the RVS PLAY state [Fig. 9A5], but again.
And solenoid 6 to T₁Seconds are energized and trigger
The cam gear 68 is for PLAY because the arm 65 is driven.
Continues rotation by engaging the next tooth without stopping at the toothless portion 69a
[Fig. 9A6]. As a result, the FR arm 77 becomes FF gear.
The gear is switched to the 75 side and the FR gear 84 is engaged with the FF gear 75.
It goes into RVS / REW mode to make it match, but Solenoy again
Do 6 to T₁Second pulse is energized and trigger arm 65
FF / REW protrusion 66b and toothless part 6
The cam gear 68 continues to rotate beyond 9b. to this
Therefore, FR gear 8 without stopping in RVS / REW mode
4 while engaging the FF gear 85 with the head chassis 2
Send it to the PLAY position side again. Assistance at this time
The displacement amount of the frame 60, that is, the feeding amount of the head chassis 2 is P
It is smaller than during LAY and larger than during FF / REW. Shi
Therefore, the pinch roller 42b is attached to the capstan shaft 53b.
The play gear 55b is not
The arm 54b remains engaged with the head chassis 2.
Since there is up to it, do not bite into the play clutch gear 56b,
Only the head 11 makes light contact with the tape. Therefore, R
Only the head while running the tape in VS / REW state
It is in the REV state in which it is pressed against the tape and played [Fig. 9B.
8].

[0045]From STOP mode to FWD / REV mode
To [see FIG. 11G]  FWD / REV mode in STOP mode [Fig. 9A1]
Mode is selected, the solenoid 6 is activated after the motor starts rotating.
T₁The second pulse is energized. This pulse energization
The cam gear 68 meshes with the flywheel gear 7 for rotation.
First, the drive time of the trigger arm 65 is short, so
It becomes the stand-by state [Fig. 9D2]. Then, turn the cam gear 68
After going through the state of [Fig. 9D3],
Do 6 has a relatively long T₆Power is supplied for 2 seconds. By this
Then, the trigger arm 65 moves and F of the FR arm 77
The movement toward the F gear 75 side is blocked [Fig. 9F4], and the PLAY mode is
Pass through the card [Fig. 9D5] and continue to rotate. P
The cam gear 68 that has passed the LAY position is moved to the FR arm 77.
Swings to the left reel gear 82b side by the FR cam 74b
FR gear 84 meshes with left reel gear 82b F
The WD / REW mode is entered, but the solenoid 6
The trigger arm 65 is FF / R because electricity is being continued.
It meshes with the next tooth beyond the EW protrusion 66b and the toothless portion 69b.
To rotate the mating cam gear 68 further, FWD / R
Pass EW mode. For the subsequent rotation of the cam gear 68
Therefore, the FR gear 77 is engaged with the left reel gear 82b.
Hold the assist pin 61 to the CUE / REV position 60c
Move the head chassis 2 to the PLAY position side again.
Slip in. Then, while playing back the sound,
Rewind playback and review (REV)
Switch to the mode [Fig. 9F8]. The reverse arm 18
Continues to be driven by long energization of solenoid 6
Is located inside the reverse cam 72 and the head lever 17
Since it is not engaged with the
Not.

[0046]From STOP to RVS / CUE mode [Fig.
See 11G]  RVS / CUE mode in STOP mode [Fig. 9A1]
Mode is selected, the solenoid 6 is activated after the motor starts rotating.
T longer than in FWD / REV mode₂Seconds pulse
Be charged. The cam gear 68 is rotated by this pulse energization.
And the reverse arm 18 starts the reverse cam 7
Move out of 2 and enter the reverse state [Fig. 9A2]. That
After that, the state of [Fig. 9D3] is changed as the cam gear 68 rotates.
And again the solenoid 6 has a relatively long T₆Energized for a second
It As a result, the trigger arm 65 becomes the FR arm 77.
Of the FF gear 75 side [Fig. 9C4], RV
Entering the S-PLAY mode [Fig. 9A5], the solenoid 6
Is continuously energized, the cam gear 68 is PLA
The projection 66a for PLAY and the toothless portion 6 without stopping at the Y position
Continue rotating over 9a. And FR arm 7
The second FR pin 83b of No. 7 is driven by the FR cam 74b.
The FR gear 84 meshes with the left reel gear 82b, and the RVS.
Shift to FF mode. However, energizing the solenoid 6
Is continued, the trigger arm 65 is FF / R.
The cam gear 6 is passed over the EW projection 66b and the toothless portion 69b.
Rotate 8 further to pass RVS / FF mode.
Then, the cam gear 68 is further rotated to the FR cam 74b.
Therefore, the FR gear 84 is meshed with the left reel gear 82b.
The FR arm 77 is fixed and the head chassis 2 is PL
Send it toward the AY position. This CUE / REV position 6
0c displacement of assist cam 60, that is, head chassis 2
The feed amount is smaller than that at the PLAY position 60a and FF
-Large than the REW position 60b. Therefore, a pinch
The roller 42b does not contact the capstan shaft 53b, and
The play gear 55b also bites into the play clutch gear 56b.
However, only the head 11 makes light contact with the tape. Shi
Therefore, do not run the tape in the RVS / FF mode.
RVS ・ C to play by pressing only the head of the glass against the tape
It will be in the UE state [Fig. 9C8].

[0047]From FWD / PLAY mode to FWD / CU
To E mode [Refer to Fig. 11H]  FWD / C in FWD / PLAY mode [Fig. 9D5]
When the UE mode is selected, the solenoid 6 is turned on.₁Second power
Ruth is energized. This pulse energization triggers
The cam 65 is disengaged from the PLAY protrusion 66a,
A68 meshes with the flywheel gear 7 and starts to rotate
It By the rotation of the cam gear 68, the assist pin 6
Since the cam displacement given to 1 gradually decreases,
The chassis 2 returns to the STOP position and
The play arm 54a on the play side moves to play gear 55a.
Is separated from the play clutch gear 56a and the FWD / P
Cancel the LAY state. Further, the second FR pin 83b is engaged.
The movement is restricted by the matching FR cams 74a and 74b.
The FR arm 77 which is being driven is rotated by the rotation of the cam gear 68.
Is switched to the FF gear 75 side, and the FR gear 84 is switched to the FF gear.
Enter FWD / FF state [Fig. 9E5] that meshes with 75
However, here again the solenoid 6 is T₁Pulse for seconds is energized
And trigger arm 65 is pulled, so FF / RE
FWD / FF over the W projection 69b and the toothless portion 69b
The cam gear 68 is rotated without stopping at the position. And
Assist with FR gear 84 engaged with FF gear 85
Check the cam displacement amount at the CUE / REV position 60c of the cam 60.
Feed the chassis 2 to the PLAY position side
To be crowded. The assist cam 6 at the CUE / REV position 60c
The displacement amount of 0, that is, the feed amount of the head chassis is PLA
Smaller than Y position 60a and smaller than FF / REW position 60b
Since it is also large, only the head 11 makes light contact with the tape.
FWD-C to play and play the tape in FF state
The UE state is entered [Fig. 9E8].

[0048]From RVS / PLAY mode to RVS / RE
To V mode [Refer to FIG. 11H]  RVS / R in RVS / PLAY mode [Fig. 9A5]
When EV mode is selected, a relatively short T₁Second pulse
Is energized to the solenoid 6, and the trigger arm 65 is PL
The cam gear 68 disengages from the AY projection 66a and flywheel
When it engages with the gear wheel 7 and starts rotating, the head shear
Release the PLAY status after the 2 starts returning to the STOP position.
To do. Further, as the cam gear 68 rotates, the FR arm
77 is switched to the FF gear 75 side and the FR gear 84 is F
Enters RVS / REW mode to engage F gear 75
But again on the solenoid 6₁Pulse for a second is energized
FF / REW projection because the trigger arm 65 is pulled
RVS / REW mode over 66b and toothless portion 69b
The cam gear 68 is rotated without stopping at. And FR
Assist cam with gear 84 engaged with FF gear 75
Head of 60 cam displacement at CUE / REV position 60c
It is given to the chassis 2 and sent to the PLAY position side. To this
As described above, the movement of the head chassis 2 is limited to the head only.
RVS / R
RVS ・ R to play while running the tape in EW state
It becomes the EV state [Fig. 9B8].

[0049]From FWD / CUE mode to STOP mode
To [see Figure 11I]  In the FWD / CUE mode [Fig. 9E8], the STOP mode is
Is selected, the solenoid 6 is turned on.₁Relatively short of a second
The pulse is energized and the trigger arm 65 is CUE / RE.
The cam gear 68 is rotated by being disengaged from the V protrusion 66c.
[Fig. 9E9]. As the cam gear 68 rotates, the first FR gear
83a rides on the FR cam 74d and mounts the FR arm 77.
In order to swing the left reel gear 82b, the FR gear 84
Is separated from the FF gear 85, and the FWD / CUE mode is set.
To release. The second FR pin 83b is intermediate by the cam 74a
Held in position. After that, the brake gear of the cam gear 68
The frame 73 drives the brake arm 76 and the left and right reel stands
Fix 57a and 57b [Fig. 9E9]. Then Kamui
Assist pin 61 assist cam with rotation of a 68
Move over 60 to STOP position 60e [Fig. 9E10
 ], And shifts to the STOP mode [FIG. 9A1].

[0050]From FWD / REV mode to STOP mode
To [see Figure 11I]  In the FWD / REV mode [Fig. 9F8], the STOP mode is
Is selected, the solenoid 6 is turned on.₁Relatively short of a second
The pulse is energized and the trigger arm 65 is CUE / REV.
The cam gear 68 starts to rotate after being disengaged from the projection 66c.
[Figure 9F9]. At this time, the FR arm 77 has the second FR pin 8
Since 3b is separated from the FR cam 74b, the FR belt 87
The FR gear 84 is disconnected from the left reel gear 82b by the tension.
The FWD / REV mode is released by swinging in the releasing direction.
It The FR gear 84 disengaged from the left reel gear 82b is F
By the tension of the R belt 87 and the engagement of the trigger arm 65,
Prevents the FR arm 77 from moving to the FF gear 75 side
The intermediate position between the left reel gear 82b and the FF gear 75
The FR gear 84 is held at. In addition, the cam gear 68
The brake arm 76 is driven by the rake cam 73.
Therefore, the left and right reel stands 57a, 57b are fixed [Fig.
9F9]. After that, assist with rotation of the cam gear 68
The pin 61 moves above the assist cam 60 to the STOP position 60e.
Move toward [Fig. 9F10] and shift to STOP mode.
[FIG. 9A1].

[0051]RVS / CUE mode to STOP mode
To [See Figure 11J]  In RVS / CUE mode [Fig. 9C8], STOP mode
Is selected, the solenoid is turned on.₇Relatively long seconds
Ruth is energized, trigger arm 65 is CUE REV
The cam gear 68 starts to rotate by coming off the projection 66c.
[Fig. 9C9]. The rotation of the cam gear 68 causes the FR gear.
Is the second FR pin 83b restricted by the FR cam 74b?
The left reel by the tension of the FR belt 87 to separate from
Swing the FR gear 84 in the direction to separate it from the gear 82b.
Then, the RVS / CUE mode is released. FR arm 77
Is rotated to the FF gear 75 side by the trigger arm 65.
And the left reel gear 82b and the FF gear 75 are blocked.
The FR gear 84 is held at the intermediate position. In addition, the break
Along with the rotation of the cam cam gear 68, the brake cam 73
Drives the brake arm 76 to drive the left and right reel stands 57.
Fix a and 57b [Fig. 9C9]. After that, Kamgi
Assist pin 61 assist cam with rotation of a 68
Moves over 60 toward STOP position 60e,
The stop pin 61 is at the HOLD position 60d of the assist cam 60.
The reverse pin 78 reaches H of the reverse cam 72 when reaching
It falls to the OLD position 79 and forwards the reverse arm 18.
It is also used as a trigger cam 67 while moving to the side
Attach the trigger arm 65 to the HOLD projection 66d.
Then, the rotation of the cam gear 68 is stopped. That is, the trigger arm
A HOLD-like structure in which the head chassis 2 is stopped by 65
State [Fig. 9C10]. After that, to the solenoid 6
When the power is cut off, the trigger arm 65 becomes the reverse arm 1
By the force of the spring 96 stretched between
The cam gear 68 starts rotating again to return to its original position.
Move the assist pin 61 to the STOP position 60e.
Let me. . Then, the head chassis 2 is returned to the STOP position.
Along with the reverse pin 78 on the reverse cam 72,
Head lever 1 dropped from D position 79 to STOP position
Return 7 to the forward side. With this, the head holder 1
4 rotates, and the head 11 moves to a predetermined position in the forward state.
Transition to the set STOP mode [Fig. 9A1, Fig. 1
0A1].

[0052]RVS / REV mode to STOP mode
To [see Figure 11J)]  In RVS / REV mode [Fig. 9B8], STOP mode
Is selected, the solenoid 6 is turned on.₇Relatively long in seconds
The pulse is energized and the trigger arm 65 is CUE / RE.
The cam gear 68 starts to rotate by coming off the V-shaped projection 66c.
[Fig. 9B9]. With the rotation of the cam gear 68, the first
The FR pin 83a is driven by the FR cam 74d to drive the FR arm.
In the direction in which the Mu 77 separates the FR gear 84 from the FF gear 75
Swing to release RVS / REV mode. FR arm
77 moves the left reel gear 82b by the trigger arm 65.
And the left reel gear 82b and F
The FR gear 84 is held at an intermediate position with respect to the F gear 75. Change
And the brake cam 73 drives the brake arm 76
The left and right reel stands 57a and 57b are fixed [Fig. 9B9].
After that, the assist pin 61 is rotated as the cam gear 68 rotates.
Moves on the assist cam 60 toward the STOP position 60e.
It moves, but on the way to the HOLD position 60d
Enter the HOLD state where the stop pin 61 is stopped [Fig. 9B1
0], the movement of the head chassis 2 and the head lever 17 is
When stopping with cyst pin 61 and returning to those STOP positions
I try to reduce the acceleration of. Then Soleno
The power to the id 6 is cut off and the trigger arm 65 is returned to its original position.
The cam gear 6 to return to the position by the force of the spring 96.
8 starts rotating again and stops the assist pin 61 at the STOP position
The reverse cam 72 on the reverse cam 72.
-Spin 78 dropped from HOLD position 79 to STOP position
And This shifts to STOP mode [Fig. 9A
1].

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

[0054]

As is apparent from the above description, in the tape recorder control mechanism of the present invention, the assist pin is a two-stage pin whose tip side is smaller in diameter than 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 a step is provided in the vicinity that is in sliding contact with the small diameter part of the assist pin, and in a part away from the basic circle that is in sliding contact with 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 etc. or the reaction force from the capstan etc. is large, the cam displacement is given by the sturdy large diameter part, and when the spring load etc. is relatively small immediately before the stop position etc., the small diameter part abuts. The angle corresponding to the slope required to roll the pin is made relatively large. 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. Accordingly, 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 drawings]

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

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

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

4A4 is a diagram illustrating a reverse state of the head rotating mechanism in FIG. 1. FIG.

4A10 is a view for explaining a HOLD state of the head rotating mechanism in FIG. 1. FIG.

FIG. 5 is a schematic diagram showing the structure of a reverse recording tape recorder incorporating the control mechanism of the present invention.

6A and 6B are views showing the relationship between gears and cams of the tape recorder of FIG. 5, FIG. 6A is a schematic view, FIG. 6B is a sectional view showing the relationship between an assist pin and an assist cam, and FIG. It is a perspective view of a cam.

FIG. 7 is a view of the arrangement relationship of gears, cams, and the like in FIG. 6 viewed from the opposite direction.

FIG. 8 is an exploded perspective view showing a head chassis and a rotary head mechanism of the tape recorder in a disassembled state.

9A1 is a gear mechanism diagram showing a STOP mode state of the tape recorder. FIG.

FIG. 9A2 is a gear mechanism diagram showing a reverse selection state.

[Figure 9A3] PLAY mode and REW on the reverse side
It is a gear mechanism figure showing the state in the branching point which selects mode and.

[Fig. 9A4] Fig. 9A4 is a gear mechanism diagram showing a state where the RVS / PLAY mode is selected.

FIG. 9A5 is a gear mechanism diagram showing an RVS / PLAY mode.

[Fig. 9A6] Fig. 9A6 is a gear mechanism diagram showing a state at a branch point at which the RVS / PLAY mode is switched to the STOP mode or the RVS / REV mode.

FIG. 9A7 is a gear mechanism diagram showing a state in which the STOP mode is selected from the RVS / PLAY mode.

[Fig. 9A9] Fig. 9A9 is a gear mechanism diagram showing a state where the reel base is braked when the mode is changed from the RVS / PLAY mode to the STOP mode.

[Fig. 9A10] Fig. 9A10 is a gear mechanism diagram showing a holding state when shifting from the RVS / PLAY mode to the STOP mode.

FIG. 9B8 is a gear mechanism diagram showing an RVS / REV mode state.

[Fig. 9B9] Fig. 9B9 is a gear mechanism diagram showing a brake state at the time of shifting from the RVS / REV mode state to the STOP mode.

[Fig. 9B10] Fig. 9B10 is a gear mechanism diagram showing a holding state at the time of shifting from the RVS / REV mode state to the STOP mode.

FIG. 9C4 is a gear mechanism diagram showing a state at a branch point where the FF mode is selected on the reverse side.

9C8 is a gear mechanism diagram showing an RVS / CUE mode. FIG.

[Fig. 9C9] Fig. 9C is a gear mechanism diagram showing a braking state when the mode is changed from the RVS / CUE mode to the STOP mode.

FIG. 9C10 is a gear mechanism diagram showing a holding state when the mode is changed from the RVS / CUE mode to the STOP mode.

FIG. 9D2 is a gear mechanism diagram showing an FWD / PLAY selection state.

[Fig. 9D3] Fig. 9D3 is a gear mechanism diagram showing a state at a branch point for selecting the REW mode and the FWD / PLAY mode.

FIG. 9D4 is a gear mechanism diagram showing a state at a branch point for selecting the FF mode and the FWD / PLAY mode.

FIG. 9D5 is a gear mechanism diagram showing an FWD / PLAY state.

[Fig. 9D6] Fig. 9D6 is a gear mechanism diagram showing a transition start state from the FWD / PLAY mode to the STOP mode.

FIG. 9D7 is a gear mechanism diagram showing a further advanced state thereof.

[Fig. 9D9] Fig. 9D9 is a gear mechanism diagram showing a brake state at the time of shifting from the FWD / PLAY mode to the STOP mode.

FIG. 9D10 is a gear mechanism diagram showing a state immediately before switching to the STOP mode.

FIG. 9E5 is a gear mechanism diagram showing an FF mode state.

FIG. 9E8 is a gear mechanism diagram showing an FWD / CUE mode state.

[Fig. 9E9] Fig. 9E9 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. 9E10 is a gear mechanism diagram showing a state immediately before the STOP mode.

FIG. 9F4 is a gear mechanism diagram showing a state where a REW mode is selected.

FIG. 9F5 is a gear mechanism diagram showing a REW mode state.

FIG. 9F8 is a gear mechanism diagram showing an FWD / REV mode state.

[Fig. 9F9] Fig. 9F9 is a gear mechanism diagram showing a brake operating state during a transition from the FWD / REV mode to the STOP mode.

FIG. 9F10 is a gear mechanism diagram showing a state immediately before the STOP mode.

FIG. 10A1 is a plan view illustrating the movement of the head chassis in the STOP mode.

FIG. 10A5 is a plan view for explaining the movement of the head chassis in the RVS / PLAY mode.

FIG. 10B8 is a plan view illustrating the movement of the head chassis in the RVS / REV mode.

FIG. 10D5 is a plan view for explaining the movement of the head chassis in the FWD / PLAY mode.

FIG. 10E5 is a plan view illustrating the movement of the head chassis in the FF mode.

FIG. 11A 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. 11B] FWD / PLAY or RVS / PLA
7 is a time chart of switching from the Y state to the STOP mode.

FIG. 11C is a time chart of switching from STOP mode to FF mode.

FIG. 11D is a time chart of switching from STOP mode to REW mode.

[FIG. 11E] ST from FF mode or REW mode
It is a time chart which switches to OP mode.

FIG. 11F is a time chart of switching from STOP mode to FWD / CUE mode or RVS / REV mode.

FIG. 11G is a time chart of switching from STOP mode to FWD / REV or RVS / CUE mode.

[FIG. 11H] FWD / CUE from FWD / PLAY state
RVS / R from mode or from RVS / PLAY status
It is a time chart which switches to EV mode.

FIG. 11I is a time chart for switching from FWD / CUE mode to STOP mode or from FWD / REV mode to STOP mode.

FIG. 11J is a time chart of switching from RVS / CUE to STOP mode or from RVS / REV to STOP mode.

FIG. 12 is a central longitudinal sectional view showing an example of a drive gear.

FIG. 13A is a vertical sectional view showing another embodiment of the pinch arm.

FIG. 13B is an exploded perspective view of the pinch arm shown in FIG. 13A.

FIG. 14 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

[Procedure amendment]

[Submission date] July 24, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

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

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

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

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

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

FIG. 6 is a schematic 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 view of the arrangement relationship of gears, cams, and the like in FIG . 7 viewed from the opposite direction.

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

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
It is a gear mechanism figure showing the state in the branching point which selects mode and.

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 at the time of 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 braking state when the mode is changed 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.

FIG. 32 is a gear mechanism diagram showing a brake state at the time of 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 illustrating the movement of the head chassis in the RVS / PLAY mode.

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

FIG. 46 is a plan view illustrating 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 solenoids 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 to a STOP mode from a state.

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 : From FF mode or REW mode to STO
It is a time chart which switches to 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
It is a time chart which switches to 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 for switching from RVS / CUE to STOP mode or from RVS / REV to STOP mode.

FIG. 58 is a central longitudinal 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 reference signs] 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

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

FIG. 58

FIG. 59

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 8]

[Figure 9]

[Figure 7]

[Figure 10]

FIG. 11

[Fig. 12]

[Fig. 13]

FIG. 60

FIG. 14

FIG. 15

FIG. 16

FIG. 17

FIG. 18

FIG. 19

FIG. 61

FIG. 20

FIG. 21

FIG. 22

FIG. 23

FIG. 24

FIG. 25

FIG. 26

FIG. 27

FIG. 28

FIG. 29

FIG. 30

FIG. 31

FIG. 32

FIG. 33

FIG. 34

FIG. 35

FIG. 36

FIG. 37

FIG. 38

FIG. 39

FIG. 40

FIG. 41

FIG. 42

FIG. 43

FIG. 44

FIG. 45

FIG. 46

FIG. 47

FIG. 50

FIG. 51

FIG. 48

FIG. 49

FIG. 52

FIG. 53

FIG. 54

FIG. 55

FIG. 56

FIG. 57

Claims (1)

Claim: What is claimed is: 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 carrying a magnetic head or the like. In the control mechanism of the recorder, the assist pin is a two-step 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 diameter portion is near the base circle of the cam. A tape recorder control mechanism, which has a step in sliding contact with the large diameter portion of the assist pin at a portion away from the basic circle.