JPS6346892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive mechanism for a tape recorder that uses a solenoid to control a head base and a pinch roller.

Conventionally, in tape recorders that use a solenoid to mesh a rotating gear with a gear, and control a head base or pinch roller using the rotational force of the gear, it is necessary to mesh the solenoid's return spring and gear with the rotating gear. Since the springs were provided separately, the number of parts increased and the spring force of each spring was constant, so a strong spring had to be used to ensure reliable operation. There were drawbacks such as the need to use a strong solenoid.

The present invention has been made to improve the above-mentioned drawbacks, and an object of the present invention is to provide a drive device for a tape recorder in which the returning force of two members can be obtained with a single spring, and the spring force becomes stronger when the members return. do.

Next, an embodiment of the structure will be described with reference to FIGS. 1 to 4.

Figure 1 is a front view, Figure 2 is a front view looking from the rear side from the chassis, Figure 3 is an exploded perspective view looking from the front side from the chassis, and Figure 4 is an exploded perspective view looking from the rear side from the chassis. 1 is a chassis, 2 is a first substrate disposed on the back side of the chassis 1, and a coil portion 2 for a capstan motor, which will be described later.
a is installed and the capstan shaft receiving part 2
b and 2c are attached (Fig. 4). Reference numeral 3 denotes a second board disposed on the back side of the first board 2, in which a control circuit for controlling the energization of the coil portion 2a of the capstan motor and the energization of the reel motor and plunger, etc., which will be described later, is incorporated. It is. A first flywheel 4 also serves as a capstan motor, and a magnet (not shown) facing the coil portion 2a is attached to the back surface of the flywheel, and a first capstan shaft 4a is fitted therein. Further, a gear 4b is formed on the first flywheel 4. The first capstan shaft 4a is fitted into a bearing 1a formed on the chassis 1, and has a tip end protruding from the front surface of the chassis 1. 5 is the second
As a flywheel, the second capstan shaft 5a
is fitted, and a gear 5b is formed.
The second capstan shaft 5a is also fitted into a bearing 1b formed on the chassis 1, and its tip end is attached to the bearing 1b formed on the chassis 1.
is protruding from the front. Reference numeral 6 denotes a pulley bearing a shaft on the back surface of the chassis 1, and a belt 7 is wound between the pulley and the first and second flywheels 4 and 5 described above. Therefore, the second flywheel 5 is rotated via the belt 7 as the first flywheel 4 rotates. Reference numerals 8 and 9 indicate right and left solenoids, respectively, and engagement protrusions 10a and 1 of right and left trigger levers 10 and 11, which will be described later, are provided at the tips of the suction rods 8a and 9a, respectively.
1a is engaged. 10 and 11 are chassis 1
The right and left trigger levers are supported by shafts provided on the back side of the
a, 11a, and right and left gears 1, which will be described later.
Engagement claws 10b, 11b and engagement pieces 10c, 11 that engage with the first protrusions 12a, 13a of No. 2, 13
c are formed respectively. Reference numerals 12 and 13 denote right and left gears bearing on shafts provided on the back surface of the chassis 1, and notch gears 12e and 13e meshed with the gears 4b and 5b of the flywheels 4 and 5 described above are provided on the outer periphery. It is formed. Note that these gears 12e and 13e have grooves formed in some of them, so that they elastically abut against the gears 4b and 5b to ensure smooth engagement. Further, the front surfaces of the gears 12 and 13 include first protrusions 12a and 13a, second protrusions 12b and 13b, and cams 12c and 13.
c is formed, and furthermore, third protrusions 12d,
13d is formed. Reference numerals 14' and 15' are biasing springs whose central coil portions are fitted to the protruding shaft of the chassis 1, and one end of which is connected to the third protrusion 12 of the left and right gear.
d, 13d. The other ends of the biasing springs 14' and 15' are connected to the right and left trigger levers 1.
Protrusions 10d and 11d formed on the front surface of 0 and 11
Since both are in contact with each other, turn gear 12 clockwise.
The gear 13 is biased counterclockwise.

The trigger levers 10, 11 are activated by the biasing springs 14', 15' to the suction rods 8 of the solenoids 8, 9.
A spring force is applied in a direction in which the gears 12e and 13e of the gears 12 and 13 mesh with the gears 4b and 5b of the flywheels 4 and 5, respectively. However, at this time, the engaging claws 10b, 1 of the trigger levers 10, 11
1b is the first protrusion 12a, 13a of the gears 12, 13
Since the gears 12e and 13e of the gears 12 and 13 are engaged with the gears 4 and 4 of the flywheels 4 and 5,
There is no meshing with b and 5b.

Although the above description is about the structure on the rear side of the chassis 1 shown in FIGS. 2 and 4, the structure on the front side of the chassis 1 will be explained below with reference to FIGS. 1 and 3.

Reference numerals 14 and 15 denote right and left sub-pinch arms made of synthetic resin that are pivotally supported together with a spring (not shown) on shafts 1c and 1d installed on the front surface of the chassis 1. cassette receiving portions 1e, formed on the chassis 1 by springs 14d, 15d, respectively;
It is spring biased towards the 1f side. That is, one end of each of the springs 14d and 15d is connected to the cassette receiving part 1.
e, 1f, and the other end is sub-pinch arm 1
4, 15, the contact portions 14a, 15 formed on the sub-pinch arms 14, 15
A is spring-biased so as to abut against the cassette receivers 1e and 1f, respectively. Also sub pinch arm 1
4 and 15 are projections 2 of the pinch drive plate 21, which will be described later.
1b, 21c, and protrusions 14c, 1 that contact control springs 18, 19 provided on pinch arms 16, 17, which will be described later.
5c is formed. 16 and 17 are pinch arms having pinch rollers 16a and 17a,
It is pivotally supported by the shafts 1c and 1d. 1
Control springs 8 and 19 are inserted into the shafts 1c and 1d together with the pinch arms 16 and 17, and both ends thereof are engaged with the pinch arms. The control springs 18, 19 therefore have no effect on the pinch arms 16, 17. Also pinch arm 1
Windows 16b, 17b are formed in 6, 17, and one ends of control springs 18, 19 face these windows 16b, 17b. And this window 16b, 17b
The projections 14c, 1 of the sub-pinch arms 14, 15
5c are adapted to abut against control springs 18, 19 facing the corresponding windows 16b, 17b. Therefore, the protrusion 21b of the pinch drive plate 21,
Sub-pinch arm 14 or 15 by 21c
When is rotated against the spring force, pinch arm 1
6, 17, the protrusion 14c or 15c is the control spring 1
8 or 19, the pinch roller 1
6a or 17a is the capstan shaft 4a or 5
It is pressed against a. Note that the extra rotational force of the sub-pinch arm 14 or 15 after the pinch roller 16a or 17a contacts the capstan shaft 4a or 5a is absorbed by the control springs 18, 19.

Reference numeral 20 designates a connecting plate made of synthetic resin in which a protrusion 20a on the back side is guided by an elongated hole 1g in the vertical direction of the chassis 1, and a fitting hole 20b at the tip into which a central protrusion 21a of a pinch drive plate 21 to be described later is fitted. It is formed. Furthermore, protrusions 20d having protrusions 20c that are fitted into elongated holes 25a of the switching plate 25, which will be described later, are formed on the upper and lower sides of the connecting plate 20. Reference numeral 21 designates a pinch drive plate made of synthetic resin that is connected by engaging the center protrusion 21a with the fitting hole 20b of the connecting plate 20, and includes protrusions that selectively abut the control springs 18 and 19 on the left and right sides. 21b and 21c are formed.
22 is a protrusion 2 on the back side of the long hole 1g of the chassis 1.
2a is a guided cam follow lever,
Left and right control protrusions 22b and 22c project downward from the window 1h of the chassis 1 and correspond to the gums 12c and 13c of the gears 12 and 13, respectively. Also, on the upper surface of this cam follower lever 22, there are provided two holes that are fitted into shaft holes 23a and 24a of hooks 23 and 24, which will be described later.
A shaft rod 22d is formed, and contact portions 22e are formed on the left and right sides to contact two hanging pieces 25b of a switching plate 25, which will be described later. 23 and 24 are synthetic resin hooks for right or left use whose shaft holes 23a and 24a are fitted into the shaft rod 22d of the cam follow lever 22, and the connecting plate 20 is attached to the lower end in the figure.
Hook claws 23b and 24b that engage with the protrusions 20d are formed respectively, and a control piece 23 for controlling brake levers 37 and 38, which will be described later, is provided at the upper end.
c, 24c are formed. Further, spring hook portions 23d and 24d are formed approximately in the center. 25
is a switching plate that slides in the left-right direction guided by a protruding shaft 1i formed on the chassis 1 by outsert molding. The contact portion 22e corresponds to the hanging piece 25b. Reference numerals 26 and 27 denote presser springs whose coil portions are fitted and fixed to the chassis 1, one end of which presses down the switching plate 25, and the other end of which is engaged with the spring hook portions 23d and 24d of the hooks 23 and 24. And, by means of the presser springs 26, 27, the hooks 23, 24,
That is, by pressing the cam follow lever 22 downward, the control protrusion 22b of the cam follow lever 22,
22c is pressed toward the cams 12c, 13c of the gears 12, 13. 28 is a head base which is vertically movable, with a protrusion 28a formed at the lower end of the back surface being guided by the guide groove 1i of the chassis 1, and a tip thereof being guided by a roller (not shown) between it and the chassis 1. , reproduced head base 2 on the surface
9 is fixed. Also, this head base 28
, the projections 21b and 21 of the pinch drive plate 21 are
hole 28c into which c is inserted and protrusion 20 of connecting plate 20
A hole 28b is formed into which the hole 28b is inserted. 30
Insert the pin 30 into the shaft hole 29a of the reproduction head base 29.
A is an erase head base on which a bearing is mounted, and right and left erase heads 31 and 32 are attached to the left and right sides. On the back side of the erasing head base 30, protrusions 21b and 21c of the pinch drive plate 21 protrude from the holes 29b and 29c of the reproduction head base 29.
Contact pieces 30b and 30c that come into contact with are formed. Reference numeral 33 denotes a reproduction head 33 rotatably fitted into the guide hole 29d of the reproduction head base 29.
b, and a gear 33a on the back side.
is formed. 34 is the reproduction head base 29
It is a fan-shaped gear pivotally supported on the back surface of the rotary head 33, and is meshed with the gear 33a of the rotating head 33. A protrusion 34a is formed on the back surface of this fan-shaped gear 34. Reference numeral 35 is a synthetic resin slide plate having an L-shaped side surface, and has a horizontal hole 35a into which the protrusion 28a of the head base 28 is inserted, and one piece of the slide plate is inserted between the head base 28 and the chassis 1. The head 2 of the connecting plate 20 is inserted between the head base 28 and the chassis 1.
An engaging portion 35b is formed to be engaged with the rotary head 33, and the projection 34a of the fan-shaped gear 34 is engaged with the other piece, and the sliding of the slide plate 35 causes the rotary head 33 to
A guide groove 35c is formed for rotating about 180 degrees. Reference numeral 36 is a head rotation holding plate which is fixed to the chassis 1 at both ends and is used to attach the head rotation by pressing the erasing head base 30 at the center, and 37 and 38 are brake levers in a brake device and are used to move the hooks 23 and 24. The brake is released by 39 is a switch control member attached to the hole 25c at one end of the switching plate 25, and is engaged with a knob of a slide switch 40 for switching the rotational direction of the flywheel 4 having the reel motors 2, 3 and a capstan motor. There is.

The above is a description of the structure, and the operation will be described below. Note that FIGS. 1 and 3 show a stopped state in the forward direction. In other words, the switching plate 2
5 is moving to the right in the figure, and the slide plate 35 is also moving to the right. Therefore, connecting plate 2
The protrusion 20d of 0 is the hook 23b of the right hook 23.
The protrusion 21b of the pinch drive plate 21 corresponds to the control spring 18 of the pinch arm 16 and the abutment piece 30b of the erasing head arm 30. The rotary head 33 is also in a forward playback state.

(1) Queue operation (forward fast-forward playback state) When a cassette is loaded into a tape recorder or the power switch is turned on, the first flywheel 4 starts rotating. When the fast forward switch is operated in this state, the right solenoid 8 is energized, the suction rod 8a is attracted, and the trigger lever 10 is rotated counterclockwise. As a result, the engagement projection 10a and the first projection 12a of the gear 12 are disengaged. At this time, the biasing spring 14' applies a clockwise rotational force to the gear 12 in FIG.
b are engaged. Here, since the flywheel 4 is rotating counterclockwise, the gear 12 is rotated clockwise until the first protrusion 12a of the gear 12 contacts the engagement piece 10c of the trigger lever 10. At this time, the notched teeth of the gear 12 correspond to the gear 4b of the flywheel 4, so the flywheel 4 rotates freely. Also, at this time, the gear 12 is biased by the biasing spring 14'.
The clockwise rotational force remains applied by the spring force.

On the other hand, as the gear 12 rotates, the right control projection 22b of the cam follow lever 22 comes into contact with the cam 12c and moves upward in FIG. 6 along the cam shape of the cam 12c, so the cam follow lever 22 is moved to the right Displaced to the upward state.
Note that before the gear 12 starts rotating, the control protrusion 22b of the cam follower lever 22 is in the position of the chassis 1.
As shown in FIG. 9, a stroke (gap) is formed between the control protrusion 22b and the minimum outer diameter of the cam 12c, so that the initial rotation of the gear 12 is smooth. It will be held on.
At this time, the left control protrusion 22c is the second one of the left gear 13.
The left side of the cam follow lever 22 is in a state where it cannot be moved because it is in contact with the protrusion 13b.
As the cam follow lever 22 is displaced, the hook 23 engaged with the cam follow lever 22 is pulled up as shown in FIG. Here, since the hook 23b of the hook 23 and the protrusion 20d of the connecting plate 20 are engaged, the connecting plate 20 is also pulled up, and as a result, the pinch drive plate 2 engaged with the connecting plate 20
1 is raised. Therefore, the pinch drive plate 21
The abutting piece 30c of the erasing head base 30 corresponding to the projection 21c of the erasing head base 30 is pressed, and the erasing head base 30 rotates until the abutting piece 30c abuts the hole 29c of the reproducing head base 29, that is, the erasing head 32 on the left side moves toward the tape side of the cassette, and as the pinch drive plate 21 moves, the contact piece 30c moves toward the playback head base 2.
Push up 9. As a result, the head base 28 to which the playback head base 29 is attached is pushed up, and the pinch drive plate 21 is moved so that the head base 28 stops at the position where the playback head 33b lightly contacts the tape inserted into the window of the cassette.
The amount of movement is regulated. On the other hand, since the protrusion 21b of the pinch drive plate 21 corresponds to the contact portion 14b of the sub-pinch arm 14, the pinch drive plate 21 moves the sub-pinch arm 14 against the spring force of the spring 14d at the same time as the head base 28 moves. The pinch roller 16a is rotated to approach the capstan shaft 4a (FIG. 6). Furthermore, when the hook 23 is pulled up, the control piece 23c rotates the brake lever 37,
Therefore, the brake lever 28 also rotates to release the brake.

In this state, the tape is fast-forwarded by rotating the reel motors 2 and 3, and since the playback head 33b is in sliding contact with the tape,
It is possible to detect gaps between songs. That is, fast-forward playback in the forward direction is performed.

While this cue operation command continues, the solenoid 8 remains energized, and the first protrusion 12a of the gear 12 is in contact with the engagement piece 10c of the trigger lever 10, so the rotation of the gear 12 is prevented. This is blocked and the queue status continues.

In the above queue state, if the power to the solenoid 8 is cut off, the engagement piece 10 of the trigger lever 10
c and the first protrusion 12a of the gear 12 is released by the spring force of the biasing spring 14, and the trigger lever 10 is rotated clockwise. As a result, the gear 12 is returned to its initial position by the biasing spring 14', and the cam follower lever 22, which had been pulled up by the cam 12c, is also returned to its initial position, and the entire apparatus is therefore returned to its initial state.

(2) Pause Operation In the above-described queue operation, the pause operation is the state in which the reel motors 2 and 3 do not rotate, so the explanation will be omitted.

(3) Brake operation By energizing the left solenoid 9 from the state in which the reel motors 2 and 3 are not rotating in the above-mentioned queue operation, that is, from the pause state, the engaging pawl 11b of the left trigger lever 11 and the left gear 13 is disengaged from the first protrusion 13a, and the gear 13 is rotated slightly counterclockwise by the biasing spring 15' and engaged with the gear 5b of the flywheel 5 and the gear 13e of the first gear. The protrusion 13a is rotated until it comes into contact with the engagement piece 11c of the trigger lever 11. As a result, the cam 13c of the gear 13 comes into contact with the left control protrusion 22c of the cam follower lever 22 and pulls it up, so that the cam follower lever 22, which had been pulled up to the rightward upward position (Fig. 6), is now further horizontal (7th position). (Figure). That is, the cam follow lever 22 is connected to the cam 1 of the right gear 12.
The hook 23 is further pulled up by being rotated clockwise about the right control protrusion 22b that is in contact with the hook 2c, and the connecting plate is moved by the protrusion 20d that is engaged with the hook 23b of the hook 23. 20 will be raised further. Therefore, since the protrusion 21b of the pinch drive plate 21 is urged clockwise by the right sub-pinch arm 14 with a force stronger than the drag force including the own weight of the head base 28, the protrusion 21c of the pinch drive plate 21 is urged clockwise by the right sub-pinch arm 14. First, head base 2 via 30.
Push up 8. When the head base 28 reaches a predetermined position and is stopped by the stopper, the pinch drive plate 21 is further pulled up via the connecting plate 20, so that the sub-pinch arm 14 is rotated clockwise. Resiliently connected pinch arm 16
Rotate in the same way. Therefore, the pinch roller 16
a is pressed against the capstan shaft 4a via a tape. If the reel motor 3 is rotated in this state, a playing state is entered.

Note that the excessive stroke by the pinch drive plate 21 is absorbed by the control spring 18 because the protrusion 14c of the sub-pinch arm 14 is in contact with the control spring 18 (FIG. 7).

(4) Direction switching operation to switch from forward direction to reverse direction.

In the above-described stopped (initial) state, when the left solenoid 9 is energized, the left trigger lever 11
is rotated counterclockwise, and the engagement between the engagement claw 11b and the first protrusion 13a of the left gear 13 is released. As a result, the gear 13 is slightly rotated by the biasing spring 15', and its gear 13e meshes with the gear 5b of the left flywheel 5. At this time, since the right flywheel 4 is rotating, the right flywheel 5 is also rotating via the belt 7, and therefore the gear 13 is rotated counterclockwise. Since the solenoid 9 is only energized for a short time, the engagement piece 11c of the trigger lever 11 does not engage with the first protrusion 13a of the gear 13, so the gear 13 rotates once and then stops. . When the gear 13 rotates, the cam 13c comes into contact with the left control protrusion 22c of the cam follower lever 22 and pushes it up along the shape of the cam 13c.
At this time, the right control protrusion 22b comes into contact with the second protrusion 12b of the right gear 12, so the cam follow lever 22 is pushed up using the right control protrusion 22b as a fulcrum. When this cam follower lever 22 is rotated, the right abutting portion 22e is moved to the switching plate 2.
5, and slides the switching plate 25 to the left. This switching plate 2
Since the protrusion 20c of the connecting plate 20 is fitted into the elongated hole 25a of 5, the connecting plate 20 is rotated clockwise by sliding the switching plate 25 to the left. Also, by sliding the switching plate 25, the hole 2
Switch control member 39 attached to 5c
The switch 40 is switched via the switch 40 and provides information to the control circuit that the reverse direction has been switched.

On the other hand, as the head 20e of the connecting plate 20 moves to the left, the slide plate 35 engaged with the head 20e slides to the left.
Since the protrusion 34a of the sector gear 34 is engaged with the guide groove 35c of the slide plate 35, the sector gear 34 rotates as the slide plate 35 slides, and the rotary head 33 meshed with the gear rotates.
is rotated approximately 180 degrees, and the magnetic gap of the reproducing head 33b becomes ready for reproduction in the reverse direction.

When the rotary head 33 rotates, it is reversely biased by a known means (not shown) and its stopping position is regulated by an azimuth adjustment mechanism.

When the gear 13 completes one revolution, the cam follower lever 22 returns to its initial position and the switching operation ends (FIG. 8).

Note that during the above switching operation, the hook 24 is pulled up, but this is before the connecting plate 20 moves to the left, so the protrusion 20d of the connecting plate 20 will not be caught by the hook 24b of the hook 24. do not have. Therefore, the head base 28 will not be pushed up.

The switching operation ends as described above, but
In this embodiment, the switching operation is performed alone, but the switching operation may be performed during the play operation in the reverse direction, and then the switching operation may be performed in the play operation.

Hereinafter, the review (fast-forward reproduction state in the reverse direction), pause, and play operation in the reverse direction are the same operations as those in the forward direction described above, so a description thereof will be omitted.

As described above, in the present invention, a biasing spring is provided between the gear that controls the movement of the head base and the pinch roller, and the trigger lever that controls the engagement between the gear and the rotating gear, and a solenoid is provided on the trigger lever. Since the biasing spring applies the bias to the rotating gear of the gear and the return force of the solenoid, the number of parts is reduced, and the biasing spring reduces the force of the solenoid when suction is completed. is added to the gear biasing force to ensure rotation, and by adding the gear rotational force to the return force of the solenoid, it is possible to use a smaller solenoid.

[Brief explanation of the drawing]

The figures show an embodiment of a drive mechanism of a tape recorder, in which Fig. 1 is a front view, Fig. 2 is a front view seen from the rear side from the chassis, and Fig. 3 is an exploded perspective view seen from the front side from the chassis. Fig. 4 is an exploded perspective view of the rear side from the chassis, Fig. 5 is an explanatory diagram of the operation of the gear section, Fig. 6 is an explanatory diagram of the cue operation, Fig. 7 is an explanatory diagram of the play operation, and Fig. 8 is an illustration of the direction. Switching operation explanatory diagram, No. 9
The figure is a plan view of the gear portion. 4b, 5b... Gear, 8, 9... Solenoid,
10, 11...Trigger lever, 12, 13...Gear, 14', 15'...Biasing spring.

Claims (1)

[Claims] 1. A gear that meshes with a gear formed on a capstan shaft, a trigger lever that controls the meshing of the gear with the gear, a solenoid that controls the trigger lever, and a solenoid that has one end engaged with the gear and that controls the gear. and a biasing spring whose other end is engaged with the trigger lever and biases the suction rod of the solenoid in a direction opposite to the suction direction. drive mechanism of a tape recorder.