JPH0528578Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention is a switching system for a tape player in which the head base is moved by the force of a motor, and the magnetic head is moved to the play position, cue/review position, and stop position. Regarding equipment,
In particular, the present invention relates to a switching device for a tape player that can manually return a head base to a stop position even if the power is cut off while the head base is in a play position, cue or review position.

[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 conventional examples of the main parts of this type of logic control type switching device, with Figure 10 shown from the cassette loading side and Figure 11 shown from the back. It is something that

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 starting from the state shown in FIG. 10, the switching cam 3 presses the head base 4 in the direction A, and the drive gear 2 reaches the rotational position where it faces the toothless portion 1b. , the magnetic head 6 comes into pressure contact with the tape (not shown) and enters the play state. on the other hand,
As shown in FIG. 11, stopper steps 7a and 7b are formed on the back surface of the switching gear 1.
At the stop position shown in the figure, 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. When the switching gear 1 rotates to a state where the head base 1 is pushed to the play position by the switching cam 3, the pin 8a is stopped by another stopper step 7b, and the switching gear 1 is stopped.

[Problems with conventional technology]

In the switching device configured as described above, in the play state, the pressing portion 3a of the switching cam 3 comes into contact with the pressing piece 4a to move the head base in the direction A, and the drive gear 2 moves the toothless portion of the switching gear 1. 1b
is facing. In this conventional structure, when the power is cut off in the above-mentioned play state, the drive gear 2
There is a drawback that when the head base 4 stops, the head base 4 cannot return to the stop position. That is, when the drive gear 2 is stopped in the play state, even if the lock lever 8 is manually rotated and the pin 8a is removed from the stopper step 7b, the switching gear 1 will rotate by a small angle due to its own biasing force. However, after the drive gear 2 comes off the missing portion 1b and comes into contact with the teeth of the switching gear 1, the switching gear 1 cannot move independently.
Therefore, after that, the head base 4 cannot move unless the drive gear 2 rotates. Therefore, in this state, the tape cassette cannot be removed from the player, which is extremely inconvenient when the battery runs out or the power supply section malfunctions.

[Purpose of this invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and even if the drive gear stops due to power cut off during play, queue, or review, the head base can be manually operated. can be easily returned to the stop position,
It is an object of the present invention to provide a switching device for a tape player that allows tape cassettes to be taken out.

[Means for solving problems]

In the present invention, a base that moves together with the magnetic head is provided on the chassis, and this base is biased in a direction that moves the magnetic head away from the tape side. A switching gear that rotates together with the cam,
In a switching device for a tape player, which is provided with a drive gear that applies rotational force to the switching gear,
The switching cam is formed adjacent to a pressing portion that drives the base to move the magnetic head toward the tape side, and a stepped portion that uses the biasing force to return the base in a direction in which the magnetic head moves away from the tape side. and the switching gear has a rotation position in which the base is positioned on the tape side by the pressing part of the switching cam to a rotation position in which the stepped part returns the base.
The device is characterized in that a toothless portion is formed that continues to face the drive gear, and a lock member is further provided to stop the switching gear when the base is located on the tape side.

[Effect]

With the above means, if the lock by the locking member is released with the magnetic head located on the tape side, the tooth-missing portion of the switching gear faces the drive gear, and the switching gear is switched without transmitting power from the drive gear to the switching gear. The pressing portion of the cam no longer holds the base on the tape side, and the step portion of the switching cam causes the base to be returned by an urging force in a direction away from the tape side. As a result, it is possible to immediately shift to a stop state in which the magnetic head separates from the tape.

[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.

〔composition〕

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 direction B from this position is the cue and review position. Further, when the head base 21 moves the most in the direction B, the magnetic head 23 separates from the tape and enters 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. The center of this switching gear 25 is the shaft 26.
It is rotatably supported by. Switching gear 2
Teeth are formed around the drive gear 1 provided at the lower part of the capstan 12.
6, so that rotational force is transmitted from the drive gear 16 to the switching gear 25. but,
This tooth is provided with two missing tooth 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, and has a pressing portion α and a pressing portion β formed on its circumferential surface, and a portion adjacent to the pressing portions α and β. A stepped portion γ is formed. When the pressing piece 21a of the head base 21 is in contact with the pressing part α of the switching cam 27, it is the play position, and when it is in contact with the pressing part β, it is the queue and review position. The stop position is when the

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 in sliding contact with the circumferential surface of the biasing cam 28.

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 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. Due to this biasing force, the lock pin 34 is in 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. Further, FIGS. 6A, 7A, and 8A are views of the chassis 11 viewed from the front side, and FIGS. 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.
9 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 biased in the G direction by the force of the wire spring 30 (see FIG. 1). will be done. However, on the back side of the switching gear 25, the lock pin 34 is pushed against the stopper step a by the biasing force of the spring 36.
(see FIG. 6B), the switching gear 25 is at rest. 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 hits 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. In this way, the switching gear 25
While rotating in the direction, the switching cam 27
1a in the direction A, and in the state shown in FIG. 7A press the pressing portion α of the switching cam 27.
comes into contact with the pressing piece 21a. At this time, the magnetic head 23 comes into contact with the tape and is at the play position. In addition, in this state, the pinch roller 17 and
8 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 in contact with 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 the state shown in 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 excitation of the solenoid 35 is released, the lock pin 34 moves from the timing protrusion d to the stopper step c. In addition, the 7th A
During the transition from the figure to the state shown in FIG. 8A, the drive gear 16 remains opposed to the missing tooth portion Y of the switching gear 25. That is, the missing portion Y is formed to have a length sufficient to continue facing the drive gear 16 during this period. 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, and the pressing portion β 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 feeding force of the capstans 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 pressing part β of the switching cam 27 comes off the pressing piece 21a, and as shown in FIG. retreat to. and magnetic head 23
is separated from the tape and becomes stopped. 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 connected to the biasing cam 2.
Since it is in pressure contact with the slope 28c of No. 8, this slope 2
The switching gear 25 is biased in the G direction depending on the angle 8c. 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 switching gear 25 is driven by the rotational force of the drive gear 16, and when the state shown in FIGS.
4, the switching gear 25 stops.

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 stop position shown in Figure B.

In addition, if the drive gear 16 stops due to a power outage or the like during the cue or review operation state shown in FIGS. 8A and 8B, the conventional switching device stops the switching gear 25 from rotating and the head base 21 transition to the stop state becomes impossible,
The tape cassette cannot be removed. However, in the tape player of the present invention, if the lock lever 32 is manually rotated and the lock pin 34 is removed from the stopper step c, the switching gear 25 is rotated in the G direction by the force of the head base (see Figure 8A). do. Then, the pressing portion β of the switching cam 27 separates from the pressing piece 21a, and the pressing piece 21a falls into the stepped portion γ of the switching cam 27, and the head base moves in the direction B, instantly becoming in a stopped state. Thereafter, the switching gear 25 rotates in the G direction by the force of the biasing lever 29 (see FIG. 9B), and stops with the teeth of the switching gear 25 in contact with the teeth of the drive gear 16. In this state, the tape cassette can be taken out. When the power is turned on again, the drive gear 16 rotates, the switching gear 25 is driven, and the 6th A
Return to the state shown in the figure.

In addition, if the power is cut off in the play state shown in Figures 7A and 7B, the lock lever 3 can be manually operated.
Operate 2 twice. As a result, a transition can be made to the stop state through the states shown in FIGS. 8A and 8B.
Therefore, by providing a hole or the like in the main body for operating the lock lever 32, and operating it with a screwdriver or the like, it becomes possible to easily shift to the stop state.

In the illustrated embodiment, the shape of the switching cam 27 is determined so that the next state after the play state is the queue and review state, and then the stop state, but as another example, the switching cam 27 may be The shape may be such that the pressing portion α, which is the play position, immediately transitions to the stepped portion γ, which is the stop position.

[Effects of this invention]

As described above, according to the present invention, the switching cam includes:
A pressing part for moving the base to position the magnetic head toward the tape side and a stepped part for returning the base in a direction in which the magnetic head is away from the tape side are formed adjacent to each other, and the switching gear includes a switching gear. During the period from the rotational position where the pressing part of the cam holds the base on the tape side to the rotational position where the stepped part returns the base,
Since a tooth-missing portion is formed that continues to face the drive gear, when changing from a state in which the head is positioned toward the tape side, such as in play mode, to stop mode, the switch can be made by simply releasing the lock provided by the locking member. It is possible to immediately shift to stop mode without power being transmitted to the gears. Therefore, the switching can be performed in a short time and the switching gear can be shifted to the stop state without any load being applied to drive the switching gear. Furthermore, if the drive gear stops because the power is cut off while the magnetic head is positioned on the tape side, the tooth-missing part can be moved opposite the drive gear by manually releasing the locking member. While the tape cassette is in the stopped state, the switching cam rotates and the base can be returned by the stepped portion, automatically shifting to the stop state and allowing the tape cassette to be taken out.

[Brief explanation of the drawing]

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. 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 state, 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, 29...Biasing member for switching gear, 32...Lock member, 35...Driving member, α, β...Pushing part, γ...Step part, X, Y...
...Tooth defects.

Claims (1)

[Scope of utility model registration request] A base that moves together with the magnetic head is provided on the chassis, and this base is biased in a direction in which the magnetic head moves away from the tape side, and a switching cam that moves this base and rotates together with this switching cam. In a switching device for a tape player that is provided with a switching gear and a drive gear that applies rotational force to the switching gear, the switching cam includes a pressing portion that drives the base to move the magnetic head toward the tape side. , a step portion is formed adjacent to the magnetic head that returns the base by the biasing force in a direction away from the tape side, and the switching gear has a step portion that moves the base toward the tape side by a pressing portion of a switching cam. A tooth-missing portion is formed that continues to face the drive gear from the rotational position in which the base is returned to the rotational position in which the step portion returns the base,
A switching device for a tape player, further comprising a locking member that stops the switching gear when the base is located on the tape side.