JPH0329795Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to tape players, and in particular to a switching device that moves a magnetic head to a switching position such as a play position or a stop position by moving a head base using the force of a motor. Regarding.

[Technical background and conventional technology]

In recent years, switching devices for tape players are increasingly using the so-called logic control system, in which when an operating switch is lightly pressed, the head base is moved by the force of a motor, and the magnetic head moves forward and backward relative to the tape.

Figures 10 and 11 show the main parts of this type of logic control type switching device.
The figures are shown from the back side.

A switching gear 1 is used in this switching device. Tooth-missing portions 1a and 1b are formed at two locations around the switching gear 1. The switching gear 1 is biased clockwise in FIG. 10 by a spring or the like. When the drive gear 2 driven by the motor is facing the missing tooth portion 1a or 1b, the rotational force of the drive gear 2 is not transmitted to the switching gear 1, and the switching gear 1 is pushed slightly from this position. When it rotates, the drive gear 2 and the switching gear 1 mesh with each other and the switching gear 1 is driven.

A switching cam 3 is integrally provided on the surface of the switching gear 1, and this switching cam 3 is in contact with a pressing piece 4a of the head base 4. A magnetic head 6 is fixedly attached to the head base 4, and the head base 4 is urged by a spring 5 in a direction (direction B) into pressure contact with the switching cam 3. When the switching gear 1 rotates clockwise from the state shown in FIG. comes into pressure contact with the tape (not shown) and enters the play state. On the other hand, as shown in FIG. 11, a stopper step 7a is provided on the back side of the switching gear 1.
and 7b are formed, and when the lock lever 8 is in the stop position shown in FIG. 10, the pin 8a at the tip of the lock lever 8 is locked against the stopper step 7a by the force of the spring 9. At this time, when the solenoid 10 is energized, the pin 8a separates from the stopper step 7a, and the switching gear 1 rotates. Then switch gear 1 until head base 1 is pushed to the play position.
When the pin 8a rotates, the pin 8a moves to the other stopper step 7b.
The switching gear 1 is locked.

[Problems with conventional technology]

Recent tape players are required to save power. Therefore, it is desirable to reduce the current flowing through the solenoid 10 as well. however,
If the current flowing through the solenoid 10 is reduced, the attractive force of the solenoid 10 will be reduced, so the spring 9 that serves as a load for the solenoid 10 will also have to be weakened. However, when the spring 9 is weakened, the force that presses the pin 8a of the lock lever 8 toward the stopper steps 7a, 7b becomes weaker. Therefore, when the solenoid 10 is in a de-energized state, the lock lever 8 does not rotate reliably, and the pin 8
a may not be engaged with the stopper steps 7a, 7b, or the engagement force with respect to the stopper steps 7a, 7b may become weak, and the switching gear 1 may not be reliably locked.

[Purpose of this invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and reduces the current flowing through the solenoid, which is the drive source of the locking member that locks the switching gear, and weakens the force of the spring for returning the plunger of the solenoid. Moreover, the locking member operated by the spring moves reliably without malfunction, and the locking member can be reliably engaged with the stopper step of the switching gear, thereby saving power and ensuring reliable switching operation. The object of the present invention is to provide a switching device for a tape player.

[Structure of the present invention]

The present invention consists of a head base mounted with a magnetic head and slidably provided on a chassis, a switching cam that contacts the head base and moves the head base forward and backward relative to the tape, and a switching gear that rotates together with the switching cam. In the switching device for a tape player, the switching gear is formed with a stopper step that is locked by a locking member when the head base reaches a predetermined switching position. The member is urged by a spring in the direction of locking the stopper step, and the locking member is connected to a solenoid mechanism that drives the locking member in a direction away from the stopper step, and the locking member is connected to a solenoid mechanism that drives the locking member in a direction away from the stopper step. The solenoid is characterized by a guide that forcibly directs the lock member toward the stopper step when the switching gear rotates, and is driven by a spring when the solenoid is de-energized. The locking member is guided by a guide on the switching gear and can be reliably locked on the stopper step, thereby preventing malfunction of the locking member even if the spring force is weakened. . In this way, even if the force of the spring is weakened, malfunction does not occur, so the current flowing through the solenoid can be reduced, and power can be saved.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9B.

FIG. 1 is a plan view showing the main parts of an auto-reverse tape player as an embodiment of the present invention.

(Structure) Reference numeral 11 in the figure is a chassis. On this chassis 11 are a pair of capstans 12 and 1.
3 is provided. Capstan 1 on the right side of the diagram
2 is for driving the tape in the normal direction, and the left capstan 13 is for driving the tape in the reverse direction. A flywheel 14 integrated with a capstan 12 and a flywheel 15 integrated with a capstan 13 are provided on the back side of the chassis 11. Both flywheels 14 and 15 are driven by a motor (not shown). By the power of this motor, the capstan 12 and flywheel 14 for normal drive are driven counterclockwise in the figure, and the capstan 13 and flywheel 15 for reverse drive are driven clockwise. Further, a drive gear 16 is provided on the flywheel 14 and rotates integrally with the flywheel 14.

Pinch roller 17 is attached to one capstan 12.
are opposed to each other, and a pinch roller 18 is opposed to the other capstan 13.

Further, above each capstan 12 and 13 in the drawing, a take-up reel stand 19 and a supply reel stand 20 are provided. Both reel stands 19 and 20 are driven by a motor, with reel stand 19 being driven counterclockwise and reel stand 20 being driven clockwise, and the rotations of both reel stands 19 and 20 are not shown. It is adapted to be switched by a switching mechanism.

Further, a head base 21 is provided on the chassis 11, and a magnetic head 23 is mounted on the upper surface of the head base 21. The head base 21 is guided by a guide pin (not shown) fixed on the chassis 11 and is slidably guided in the direction of arrow AB. Further, the head base 21 is urged in the direction of arrow B by a spring 22. The play state is when the head base 21 is moving the most in the direction A, and the magnetic head 23 is in pressure contact with the tape. A state in which the head base 21 is slightly moved in the B direction from this position is the cue and review position. Further, when the head base 21 moves the most in the B direction, the magnetic head 23 separates from the tape and comes to a stopped state.

A switching gear 25 is provided on the back surface of the chassis 11. FIG. 2A is a plan view showing the front surface of the switching gear 25, FIG. 2B is a side view thereof, and FIG. 2C is a back view thereof.

This switching gear 25 is rotatably supported at its center by a shaft 26. Teeth are formed around the switching gear 25, and these teeth mesh with the drive gear 16 provided at the lower part of the capstan 12, so that rotational force is transmitted from the drive gear 16 to the switching gear 25. ing. However, this tooth has two missing parts X and Y.
When either of the missing portions X, Y faces the drive gear 16, no rotational force is transmitted from the drive gear 16 to the switching gear 25.

Further, a switching cam 27 is integrally formed on the surface of the switching gear 25. As shown in FIG. 4 (side sectional view of FIG. 1), a pressing piece 21a is bent at the center of the head base 21.
1a is pressed against the periphery of the switching cam 27 by the biasing force of the spring 22. Switching gear 2
When the switching cam 27 rotates together with 5, the switching cam 2
The head base 21 is pushed and moved in the direction of the arrow A according to the shape of the circumferential surface of the head 7. As shown in FIG. 2A, the switching cam 27 is formed in an L-shape. Pressing piece 21 of head base 21
When a is in contact with the α portion of the switching cam 27, it is the play position, when it is in contact with the β portion, it is the cue and review position, and when it is in contact with the γ portion, it is the stop position.

Further, a biasing cam 28 is integrally formed at the base of the switching cam 27. On the other hand, a biasing lever 29 is provided on the surface of the chassis 11. This biasing lever 29 is biased in the B direction by a wire spring 30. Stop pawls 29a are formed at both ends of this biasing lever 29, and these stop pawls 29a face the gears of each reel stand 19 and 20. Further, as shown in FIG. 4, the tip 29b of the biasing lever 29 is inserted into the lower surface of the chassis 11, and the tip is connected to the biasing cam 28.
It is in sliding contact with the circumferential surface of.

Moreover, as shown in FIGS. 2C and 5,
A guide surface 31 is continuously formed around the back surface of the switching gear 25. Since this guide surface 31 is stepped, the central portion of the back surface of the switching gear 25 is formed in a concave shape. This guide surface 31 is formed with three stopper steps a, b, and c. a is the stopper step for the stop position, b is the stopper step for the play position, and c is the stopper step for the cue and review positions. Also, the stopper step b
A timing projection d is provided protrudingly between and c. Further, a guide protrusion e is provided near the stopper step b. A lateral sliding surface i of this guide protrusion e is directed toward the surrounding guide surface 31. A narrow passageway B is formed between the tip of the sliding surface A and the guide surface 31. This passage RO is slightly wider than the diameter of a lock pin 34, which will be described later, and is located immediately next to the stopper step b.

Further, a lock lever 32 is provided on the back surface of the chassis 11. This lock lever 32 is rotatably supported by a pin 33 fixed to the chassis 11. A lock pin 34 is fixed at the tip of the lock lever 32. The base of the lock lever 32 is connected to a plunger 35a of a solenoid 35. Also, plunger 3
5a is equipped with a spring 36, and the elastic force of this spring 36 causes the lock lever 3 to be
2 is biased clockwise in FIG. The elastic force of this spring 36 locks the lock pin 3.
4 is brought into sliding contact with the guide surface 31.

(Operation) Next, the operation of the tape player with the above configuration will be explained.

6A and 6B show the stop state, FIGS. 7A and 7B show the play state, and FIGS. 8A and 8B show the queue and review states. Figure 6A and Figure 7
Figures A and 8A are views of the chassis 11 viewed from the front side, and Figures 6B, 7B, and 8B are views of the chassis 11 viewed from the back side.

In the stopped state, the switching cam 27 on the switching gear 25 is in contact with the pressing piece 21a of the head base 21 at the portion of its peripheral surface closest to the axis. Therefore, the head base 21 is moved in the direction B by the spring 22, and the magnetic head 23 is separated from the tape (not shown). Also, the two pinch rollers 17 and 18 are both attached to the capstans 12 and 13.
away from

At this time, as shown in FIG. 3, the tip 29b of the biasing lever 29 is in contact with the inclined surface 28a of the biasing cam 28 that is integrated with the switching gear 25, so the switching gear 25 is (see Figure 1), it is urged in the G direction. However, on the back side of the switching gear 25, the lock pin 34
is engaged with the stopper step a by the biasing force of the spring 36 (see FIG. 6B), so the switching gear 25 is stopped. Note that, since the tooth-missing portion X around the switching gear 25 faces the drive gear 16, the rotational force of the drive gear 16 is not transmitted to the switching gear 25.

When the recording or playback operation switch is pressed, the solenoid 35 is energized and the plunger 35a is briefly pulled. As a result, the lock lever 32 rotates and the lock pin 34 is removed from the stopper step a. Therefore, the switching gear 25 is unlocked, and the tip 29b of the biasing lever 29 is pushed against the slope 2 of the biasing cam 28.
The switching gear 25 rotates in the G direction due to the rotational force generated by being pressed against the switching gear 8a. When the switching gear 25 rotates slightly from the state shown in FIG. 6A,
The teeth of the switching gear 25 mesh with the drive gear 16, and the switching gear 25 is further driven in the G direction by the drive gear 16.

Since the suction time of the solenoid 35 is short, the lock lever 32 returns immediately by the force of the spring 36. Then, the switching gear 25 is connected to the drive gear 1.
6, the other stopper step b comes into contact with the lock pin 34, and the switching gear 25 is locked again at this position (the state shown in FIG. 7B). When the gear is locked again, the missing tooth portion Y of the switching gear 25 is connected to the drive gear 16.
, the power of the drive gear 16 is no longer transmitted to the switching gear 25. During the period from FIG. 6B to FIG. 7B, the solenoid 35 is once energized and de-energized after a short time. When this excitation is released, the lock lever 32 may not be able to rotate clockwise reliably because the force of the spring 36 is weak or because the plunger 35a cannot return sufficiently due to residual magnetism of the solenoid 35. At this time, switching gear 2
5 rotates, the pin 34 moves toward the guide protrusion e.
corresponds to Then, the lock pin 34 is guided toward the guide surface 31 around the switching gear 25 by the sliding surface A of the guide protrusion e, and the lock lever 32 is forcibly returned clockwise. Lock pin 34
When the lock pin 34 is guided to the passage RO, there is a stopper step b next to it.
is securely locked.

While the switching gear 25 rotates in the G direction in this manner, the switching cam 27 moves the head base 21 in the A direction via the pressing piece 21a, and in the state shown in FIG. 21a. At this time, the magnetic head 23 comes into contact with the tape and is at the play position. Further, in this state, one of the pinch rollers 17 and 18 is brought into pressure contact with the capstan 12 or 13. Therefore, the tape is held between the pinch roller and the capstan, and is fed by the rotation of the capstan. Further, the tape is wound up by the reel stand 19 or 20, and recorded or reproduced by the magnetic head 23.

Next, switching to queue or review operation will be explained.

In the playing state shown in FIGS. 7A and 7B, the pressing piece 21a of the head base 21 urges the switching gear 25 in the direction G due to the force of the spring 22 (note that in the play state shown in FIGS. 3 and 6A) Switch gear 25 with
The tip 29 of the biasing lever 29 that was applying rotational force to
b comes into contact with the flat portion 28b of the biasing cam 28 at this time, so that the biasing lever 29 is connected to the switching gear 25.
(Do not apply rotational force to the At this time, when the queue operation button or review operation button (not shown) is pressed, the solenoid 35 is energized for a short time, the lock lever 32 is rotated, and the lock pin 34 is removed from the stopper step b. Since the switching gear 25 is biased in the G direction, it rotates in the G direction by being unlocked. Since the excitation time of the solenoid 35 is short, the lock lever 32 is returned by the force of the spring 36, and the switching gear 25 is stopped with the stopper step c in contact with the lock pin 34, as shown in FIG. 8B. During the transition from FIG. 7B to FIG. 8B, the lock pin 34 that has come off the stopper step b once contacts the timing protrusion d, and after the solenoid 35 is de-energized, the lock pin 34 moves from the timing protrusion d to the stopper step c. Therefore, the lock pin 34 reliably contacts the stopper step c, and no malfunction occurs. Note that the timing protrusion d is the eighth
If it is shaped as shown by the dotted line in Figure B, and its side surface C is a slope oriented in the direction of the stopper step c, similar to the sliding surface A of the guide protrusion e, then Figures 7B to 8B will be obtained. When the solenoid 35 is de-energized in the meantime, as the switching gear 25 rotates, the side surface C reliably guides the lock pin 34 to the engagement position of the stopper step c.

During the transition from FIG. 7A to the state shown in FIG. 8A, the drive gear 16 remains opposed to the missing tooth portion Y of the switching gear 25. While the lock pin 34 moves from the stopper step b to the stopper step c, the switching gear 25 rotates by a small angle until the β portion of the switching cam 27 comes into contact with the pressing piece 21a. At this time, the head base 21 is moved back slightly in the direction B compared to the play state shown in FIG. 7A, and the magnetic head 23 comes into light contact with the tape. At this time, the pinch rollers 17 or 18 are separated from the capstans 12, 13, and the capstan's feeding force against the tape is lost. In this state, the reel stand 19 or 20 is driven to fast-forward the tape (queue operation) or rewind it (review operation). This queue or review operation is used to locate the beginning of a song.

When stopping the operation from the queue or review state shown in FIGS. 8A and 8B, the stop button is pressed to energize the solenoid 35 once. As a result, the lock pin 34 is removed from the stopper step c. Since the head base 21 biases the switching gear 25 in the G direction via the switching cam 27 by the force of the spring 22, when the lock is released, the switching gear 25 rotates in the G direction. When the switching gear 25 rotates slightly, the β portion of the switching cam 27 is pressed against the pressing piece 21.
a, and as shown in FIG. 9A, the pressing piece 21
A drops to the γ section, and the head base 21 retreats significantly in the B direction. The magnetic head 23 then separates from the tape and enters a stopped state. During this time, the rotation angle of the switching gear 25 is small, and the drive gear 16 remains facing the defective portion Y at the stage shown in FIG. 9A. At this time, as shown in FIG. 9B, the tip 29b of the biasing lever 29 is in pressure contact with the slope 28c of the biasing cam 28, so the switching gear 25 is biased in the G direction according to the angle of the slope 28c. has been done. Therefore, the switching gear 25 immediately rotates from the state shown in FIG. 9A, and the teeth around the switching gear 25 mesh with the drive gear 16. Therefore, after that, the rotational force of the drive gear 16 causes the switching gear 25 to
is driven and reaches the state shown in FIGS. 6A and 6B, the stopper step a is engaged with the lock pin 34 and the switching gear 25 is stopped.

Further, when stopping the operation from the play state shown in FIGS. 7A and 7B, the solenoid 35 is energized twice. As a result, first, Figure 8A, Figure 8B
After transitioning to the queue/review state shown in the figure,
After passing through the states shown in Figs. 9A and 9B, Figs. 6A and 6
Return to the stopping position shown in Figure B.

Note that the guide protrusion e is not limited to being provided near the stopper step b, and as shown in FIG. 8B, the timing protrusion d is provided near the guide protrusion e.
The guide protrusion e may be provided in the vicinity of the stopper step a, or may be provided in the vicinity of the stopper step a.

In addition, the stopper step 7 having the shape shown in FIG.
In the case of a and 7b, the same guide projection e may be provided on the outer peripheral side near the stopper step.

[Effects of the Present Invention] As described above, according to the present invention, the lock member is urged by the spring in the direction in which it is engaged with the stopper step of the switching gear, and the lock member is not engaged with the stopper step. In devices that are equipped with a solenoid to move the locking gear away from the stop position, a guide is provided near the stopper step of the switching gear to forcibly guide the locking member toward the stopper step, so that the spring may become weak or Even if the locking member does not move smoothly due to failure of the plunger to return due to the residual magnetism of the solenoid, the locking member is reliably locked to the stopper step, and the switching gear can be reliably locked. . Therefore, the spring can be made weaker, and the suction force of the solenoid that is loaded by this spring can be made weaker, thereby realizing power saving.

[Brief explanation of drawings]

Figures 1 to 9B show embodiments of the present invention, with Figure 1 being a plan view showing the main components of the tape player, Figure 2A being a plan view of the switching gear seen from the surface, and Figure 2B being a top view of the switching gear. 2C is a side view thereof, FIG. 3 is a plan view showing the biasing member of the switching gear, FIG. 4 is a side sectional view of FIG. 1, and FIG. 5 is a diagram showing the locking member of the switching gear. Back view shown, Figure 6A, Figure 6B
The figure is an operation explanatory diagram showing the stop state, Fig. 7A,
Figure 7B is an operation explanatory diagram showing the play state, Figure 8A
8B are operation explanatory diagrams showing the queue and review operation states, Figures 9A and 9B are operation explanatory diagrams showing the state immediately after transition from the queue and review operation state to the stop state, and Figure 10 is an operation explanatory diagram showing the queue and review operation state. A plan view of the switching device of the player, and FIG. 11 is a back view thereof. 11... Chassis, 12, 13... Capstan, 16... Drive gear, 17, 18... Pinch roller, 19, 20... Reel stand, 21... Head base, 22... Spring urging the head base, 23 ...Magnetic head, 25...Switching gear,
27...Switching cam, 28...Biasing cam, 29...
Biasing member, 35... Drive member, a, b, c... Stopper step, d... Timing protrusion, e... Guide protrusion, A... Sliding surface, X, Y... Missing tooth portion.

Claims (1)

[Scope of utility model registration request] The head base includes a magnetic head mounted thereon and is slidably provided on the chassis, a switching cam that comes into contact with the head base to move the head base forward and backward relative to the tape, and a switching gear that rotates together with the switching cam. In the switching device for a tape player, the switching gear is formed with a stopper step that is locked by a locking member when the head base reaches a predetermined switching position;
This locking member is biased by a spring in the direction of locking the stopper step, and is connected to a solenoid mechanism that drives the locking member in a direction away from the stopper step. A switching device for a tape player, characterized in that a guide is formed near the switching gear for forcibly directing the locking member in the direction of the stopper step when the switching gear rotates.