JPS6235152Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field The present invention relates to a brake device for a tape player, and is a brake device that prevents tape reels from overrunning, especially when stopped during fast forwarding or rewinding. It is related to.

(b) Description of the Prior Art Recently, tape players have adopted an automatic song selection mechanism that automatically searches for a desired song from among a large number of songs recorded on a tape. After setting the tape player to fast-forward or fast-reverse mode, this automatic song selection mechanism detects silent parts between each song recorded on a tape running at high speed. This is to restore the normal playback state.

When such an automatic song selection mechanism is adopted, when transitioning from a fast-forward/reverse state where the tape is running at high speed to a normal playback state, if the tape does not immediately shift to a low-speed state, the beginning of the detected song will be selected. The song will be played without the beginning of the song. For this reason, conventionally, during fast forwarding and rewinding, the pinch roller is released from the capstan against the force of the spring, and when the tape returns to its normal running state after cueing,
The force of this spring was used to instantly press the pinch roller against the capstan, thereby reducing the running speed of the tape. However, in this type of conventional type, when the tape is to be rapidly forwarded or rewinded, it is necessary to release the pinch roller from the capstan against the force of the spring, and the mechanism for moving the pinch roller, such as a solenoid or The disadvantage was that the operating force required for switching levers, etc. was extremely large.

By the way, recently, in order to reduce the operating force when shifting to such a fast forward/rewind state, it has been developed to use the driving force of a motor to release a pinch roller from the capstan, or to move the head toward the tape side. A tape player that can be moved back and forth has been proposed in the past. When the driving force of such a motor is used, the operating time for the pinch roller to return from the release position to the pressing position must be considerably slower than in a conventional spring-based mechanism. Therefore, when attempting to select a song, if the rotation of the reel base is not stopped by some means after the fast forward/rewind state is released, the pinch roller will be pressed against the capstan and the tape will continue to run at low speed until it returns to low speed. During this time, due to inertia due to high speed rotation during fast forwarding and rewinding,
There is a risk that the tape will pass through the silent parts between songs, making it impossible to cue the tape.

(c) Purpose of the invention The present invention was proposed in view of the above-mentioned points, and its purpose is to use the driving force of the motor to operate the pressure release of the pinch roller. Even with tapes, when transitioning from fast forward/reverse mode to normal playback mode,
It is an object of the present invention to provide a brake device that can immediately reduce the tape speed.

(d) Structure of the invention The brake device of the invention is composed of a brake mechanism that presses the reel base and a control mechanism that has a cam that operates the brake mechanism. explain.

A Brake Mechanism Section A brake plate 2 is arranged between the left and right reel bases 1 so as to be orthogonal to the arrangement direction of the reel bases 1. This brake plate 2 is provided with a pair of brake shoes 3 facing the outer peripheral surface of the reel base 1. A guide hole 4 is provided in the center of the brake plate 2 and extends perpendicularly to the arrangement direction of the left and right reel bases 1. A guide pin 5 provided on the board side of the tape player slides into the guide hole 4. It is fitted in so that it can move freely. The tip of the guide hole 4 is a narrow portion having a width approximately equal to the outer shape of the guide pin 5, while the proximal portion thereof is a wide portion wider than the outer shape of the guide pin 5. Further, a proximal guide pin 6 is provided at the proximal end of the brake plate 2, and this proximal guide pin 6 is inserted into a proximal guide hole 7 opened vertically in the board of the tape player. It is slidably fitted into the Furthermore, a spring 9 is stretched between the brake plate 2 and a locking pawl 8 protruding from the board side of the tape player, and this spring 9 causes the brake plate 2 to move toward the reel base 1 side. Always energized.

At the upper end of the brake plate 2, there is a reel base 1 in the direction perpendicular to the brake plate, that is, the left and right reel bases 1.
Lock plate 1 moving along the arrangement direction of
0 is set. This lock plate 10
has a guide hole 11 extending along the direction of movement thereof.
Two guide pins 12 are provided in the guide hole 11, and a guide pin 12 is provided on the board of the tape player.
are slidably inserted into each. Further, a spring 14 is installed between this lock plate 10 and a locking pawl 13 provided on the board of the tape player.
is tensioned, and the lock plate 10 is always urged to the right in the figure by this spring 14. Further, in the center of this lock plate 10, there is an L-shaped lock part 15 bent in an L-shape.
A brake control pin 16 provided on the brake plate 2 side is inserted into this L-shaped lock portion 15. Further, a portion of the lock plate 10 is provided with a release protrusion 17 that projects downward, and this release protrusion 17 can come into contact with a power plate 18, which will be described below. The power plate 18 is disposed at the lower stage of the lock plate 10, and is driven in the same direction as the lock plate 10 (in the arrangement direction of the left and right reel bases 1) by a cam driven by a motor or other appropriate means. ). This power plate 18 has
Release protrusion 17 provided on the lock plate 10
A pressing portion 19 that comes into contact with is provided. Further, a taper cam 20 is formed in the center of the power plate 18 and is inclined from the tip to the base of the brake plate 2, and the tip of the brake control pin 16 provided on the brake plate 2 is attached to the taper cam 20. are slidably engaged.

B Brake Control Mechanism The power plate 18 is guided by a plurality of guide holes 21 provided therein and a plurality of guide pins 22 protruding from the board side of the tape player. It is movable in the arrangement direction of the reel base 1. This power plate 18 is
and the pin 23 on the proximal end of the tape player.
It is biased toward the left side in the figure. power plate 1
A cam gear 25 is rotatably attached to the lower stage of 8. A cam 26 having a substantially spiral outer peripheral surface is integrally provided on the upper surface side of the cam gear 25, that is, on the surface facing the power plate 18. Cam gear 2 in power plate 18
A roller 27 that contacts the outer peripheral surface of the cam 26 and rotates is provided on the surface facing the cam 5 .

This cam gear 25 is attached to the outer periphery of the cam gear 25.
A gear 28 is formed for driving the tape player, and this gear 28 meshes with a pinion 30 provided at the center of one flywheel 29 of the tape player. That is, this flywheel 29 is disposed below the cam gear 25, and a pinion 30 provided on its upper surface meshes with the gear 28 of the cam gear 25. A notch 31 is formed in the gear 28 of this cam gear 25,
At this notch portion 31, the gear 28 and the flywheel side 30 are disengaged, so that no rotational force is transmitted. By the way, this flywheel 29
is connected to a tape running drive motor via a belt, and is rotated by the driving force of the motor.

The shape of the cam 26 includes a brake actuating part 26a that is closest to the center of the cam 26, a brake releasing part 26b that continues from the brake actuating part 26a that spreads outward from the center of the cam in a spiral shape, and a brake releasing part 26b. It is composed of an inclined portion 26c that connects the end portion and the brake actuating portion 26a, which is the center of the cam 26.

A stopper 32 is provided protruding from the front of the cam gear 25 in correspondence with the notch 31. A plunger link 33 whose tip protrudes close to the stopper 32 of the cam gear 25 is disposed at the lower stage of the power plate 18 . This plunger link 33 is rotatably attached to a support shaft 34 provided on the board of the tape player, and its tip portion serves as an engaging portion 35 for engaging the stopper 32. The opposite end of the engaging portion 35 is engaged with a plunger 36 . Further, a spring 38 is stretched between the plunger link 33 and a protrusion 37 provided on the board side of the tape player. This spring 38 rotates the plunger link 33 in the opposite direction to the suction direction of the plunger 36, causing the engaging portion 35 at the tip to protrude toward the center of the cam gear 25 and engage with the stopper 32 on the cam gear 25.

(e) Function of the invention The brake device of this embodiment has the above-mentioned configuration, and its function will be explained next.

(1) Locked state When the tape player is in normal play or fast forward mode, the brake
In order to keep the brake plate 2 separated from the outer periphery of the reel base 1, it is necessary to lock the brake plate 2 by a brake control mechanism.

That is, as shown in FIG. 4B, the notch 31 provided on the outer circumference of the cam gear 25 is connected to the flywheel 2
The pinion 30 is located on the 9 side, so the rotational force from the flywheel 29 to the cam gear 25 is not transmitted. At the same time, the plunger link 3 is also connected to the stopper 32 provided on the cam gear 25.
The cam gear 25 is stopped at a position regulated by the plunger link 33 because the end engaging portion 35 of the plunger link 3 is in contact with the cam gear 25 . In this case, the roller 27 of the power plate 18 is pressed by the spring 24 and comes into contact with the cam 26 provided on the cam gear 25, and the contact position is at the inclined portion 26c of the cam 26.

On the other hand, in the brake mechanism section, the brake plate 2 is connected to the spring 9 as shown by the solid line in FIG.
The brake control pin 16 provided on the brake plate 2 is pulled back to the proximal end side against the force, and the brake control pin 16 provided on the brake plate 2 is connected to the L of the lock plate 10.
It engages with the edge of the horizontal portion of the letter-shaped lock portion 15. Further, the pressing portion 19 of the power plate 18 and the release protrusion 17 of the lock plate 10 are set to be slightly apart. Therefore, in this state, even if the brake plate 2 is pulled by the spring 9, it is impossible to move toward the reel base 1.

(2) Unlocked state When the playback switch is pressed to return the tape player in the fast forward/reverse state to the normal playback state, the plunger 36 is energized based on the command from the playback switch. Plunger link 3 by 36
The end of 3 is suction driven against 38. Then, the engaging portion 35 provided at the tip of the plunger link 33 disengages from the stopper 32, and the cam gear 25 becomes able to rotate freely. As a result, the roller 27 that has been in contact with the inclined portion 26c of the cam 26 reaches the position of the brake operating portion 26a closest to the center of the cam 26, as shown in FIG. 1B. In this case, the power plate 18 to which the roller 27 is attached is pulled to the left in the figure by the spring 24, so the cam 27
The cam 26 moves along the inclined portion 26c of the
is pressed, and the cam gear 25 is rotated by a predetermined angle by the pressing force.

When the power plate 18 moves to the left in the figure in this way, the release protrusion 17 is pressed by the pressing part 19 provided on the power plate 18 and is integrated with the release protrusion 17, as shown by the chain line in FIG. The lock plate 10 that is attached moves to the left. Then, the brake control pin 16 comes off from the horizontal portion of the L-shaped lock portion 15 of the lock plate 10, and as a result, the brake plate 2 is pulled by the spring 9 and instantaneously moves toward the reel base 1. In this case, the power plate 18 remains moved to the left in the figure, so the lowest part of the taper cam 20 (the part on the reel base 1 side) is located at the brake control pin 16. There is. Therefore, the brake control pin 16 and the brake plate 2 provided thereon can move without being hindered by the tapered cam 20.

(3) Brake state When the brake plate 2 is momentarily moved by the spring 9 as described above, the state shown in FIG.
As shown, the brake shoe 3 provided on the brake plate 2 is crimped onto the outer periphery of the reel base 1,
As a result, the reel base 1 is braked. In this case, since the guide hole 4 provided in the brake plate 2 has a wide portion 4a at its proximal end, the brake plate 2 can rotate left and right about the proximal guide pin 6. Therefore, it is pressed into the reel base on the tape supply side, and the reel base 1, which continues to rotate at high speed due to inertia during fast forwarding and rewinding operations, is stopped.

In this case, when the cam 26 is pressed by the roller 27 and the cam gear 25 rotates by a predetermined angle, as shown in FIG.
31 of the cam gear 25 passes through the pinion 30, and the gear 2 of the cam gear 25 passes through the pinion 30.
8 meshes with each other. Then, the rotation of the flywheel 29 driven by the motor is transmitted to the cam gear 25 via the pinion 30, and the cam gear 25 starts rotating. Along with this, cam 2
6 also rotates, but since the brake actuating portion 26a on the cam 26 has a certain width, the cam 26 rotates in the first position.
Even if the power plate 18 is rotated from the position shown in FIG. B to the position shown in FIG. Therefore, the press-fit state of the brake plate 2 to the reel base 1 as described above is continued.

(4) Brake release state As mentioned above, the brake is activated at the first moment when the tape player shifts from fast forward/reverse to normal playback state, but other mechanisms of the tape player, such as the pinch roller, Since the transition of the head to the regeneration state is carried out by the driving force of the motor, it requires a little more operating time than the time it takes to apply the brake. Therefore, in the present invention, by utilizing this operating time, the brake is returned to the original lock state again until the pinch roller and head have completed transitioning to the normal regeneration state, and the brake is returned to the original lock state in the regeneration state. The brake is released. .

That is, as the cam gear 25 continues to rotate, the roller 2
7 contacts the brake release portion 26b side of the cam 26 as shown in FIG. The power plate 18 with this attached is the spring 2
Move to the right in the figure against the force of 4. As the power plate 18 moves, the brake control pin 16 engaged with the tapered cam 20 moves.
As shown in FIG. 3A and FIG. 4A, the brake plate 2 moves up the slope of the tapered cam and is pulled by the brake control pin 16 against the force of the spring 9 toward its base end. . As a result, the press-bonded state between the brake shoe 3 and the reel base 1 is released, and the reel base 1 returns to its original free state, allowing it to rotate at the normal playback speed.

When the brake plate 2 returns to its original position in this manner, the brake control pin 16 engages with the horizontal portion of the L-shaped lock portion 15 of the lock plate 10, which is pulled by the spring 14. As a result, this brake control pin 16
The brake control pin 16 and the brake plate 2 provided with the brake control pin 16 are locked in the original locked state as shown by solid lines in FIG. Further, the power plate 18 moves to the right in the figure as the roller 27 is pressed by the brake release part 26b.
After reaching approximately the center of the inclined portion 26c, the rotation of the cam gear 25 is prevented by the stopper 32, so that the cam gear 25 stops in the state shown in FIG. 4B.

(f) Effect of the invention As shown in the above embodiments, the brake device of the invention uses the taper cam 20 to pull the brake plate 2 against the force of the spring, and uses the force stored in the spring to move the brake plate 2. When released, the brake plate 2 is released instantaneously, and the brake plate 2 is pressed against the reel base 1 quickly and with a strong force. As a result, the reel base 1, which rotates at high speed, immediately stops, eliminating the overrun of the tape due to the inertia of the reel base 1, which is the case with conventional types. There is no risk that the first part of the played song will be omitted, and the effect is that a complete cueing operation can be performed.

In particular, the present invention uses a cam gear and a single power plate that moves to follow the cam gear to control the activation and release of the brake for such a short period of time, so it has a simple configuration and can achieve accurate timing. It is possible to realize a brake device for a tape player that can be held while applying the brake.

(g) Modifications The present invention is not limited to the illustrated embodiment; a tapered cam may be provided on the brake plate side, and a brake control pin may be provided on the power plate side.

[Brief explanation of the drawing]

The drawings are plan views showing the brake device of the tape player according to the present invention, in which the solid line in FIG. Fig. 1B shows the unlocked state of the brake control unit in the present invention, Figs. 2A and B show the operating state of the above brake, Figs. 3A, B and 4A show the released state of the above brake, and Fig. FIG. 4B shows the brake release lock state. 1... Reel base, 2... Brake plate, 3... Brake shoe, 4... Guide hole, 5
... Guide pin, 6 ... Proximal guide pin, 7 ...
...Proximal guide hole, 8...Latching claw, 9...Spring, 10...Lock plate, 11...Guide hole, 12...Guide pin, 13...Latching claw, 14
... L-shaped lock hole, 16 ... Brake control pin, 18 ... Power plate, 20 ... Taper part, 24 ... Spring, 25 ... Cam gear, 2
6...Cam, 26a...Brake operating part, 26b
...Brake release part, 26c...Slope part, 27...
... Roller, 28 ... Gear, 29 ... Flywheel, 30 ... Pinion, 31 ... Notch, 32
... Stoppa, 33 ... Plunger link, 3
6...Plunger.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A brake plate movably provided toward the reel base side, a spring that biases the brake plate toward the reel base side,
A lock plate is provided for moving in a direction different from the brake plate and locking the brake plate in a position released from the reel base against the force of a spring, and the lock plate is engaged with the brake plate. The brake plate and the power plate are provided with a spring for moving the lock plate and a release means for moving the lock plate against the force of the spring, and the brake plate and the power plate can be slid freely at a portion of a tapered cam formed on either one of them. The power plate is provided with a roller, the roller is brought into followable contact with a cam provided on an intermittent rotating cam gear, and the cam is provided with a brake actuation part and a brake release part. Brake device of the player. (2) As a driving means for the cam gear that rotates intermittently, a gear having a notch is formed on the outer periphery of the cam gear, and this gear is meshed with a pinion of a flywheel driven by a motor, and the cam gear is provided with a stopper. A plunger link operated by a plunger is brought into contact with the stopper, and the cam gear is stopped with the pinion of the flywheel positioned in the notch. A brake device for a tape player according to item 1.