JPH0353712B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating system particularly suitable for providing a small feather touch mechanism, and more particularly to a new rotating system configured to operate with a small current.

[Background of the invention]

Conventional compact tape recorder mechanisms include one-sided playback mechanisms and reverse mechanisms, but the mechanism was usually operated manually, or only playback was performed using the power of a motor.

However, with this kind of mechanism, you can easily switch it on like a high-end deck, which is called a feather touch operation.
Since there has not yet been a commercially available product that allows the mechanism to operate simply by turning it on, it has the drawback of being heavy to operate. In addition, Feather Tatsuchi's mechanisms, including large ones such as decks, required large currents.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary drive system suitable for a small tape recorder operated by feather touch.

[Summary of the invention]

In the present invention, a shaft driven by the rotation of a motor capable of forward and reverse rotation is disposed between a pair of turntables, and the shaft rotates in accordance with the rotational direction of the motor and is coupled to one of the pair of turntables. A winding member is rotatably coupled to the winding member, and a vertically movable means including a permanent magnet and a coil is disposed on the winding member so that the winding member can be vertically moved to two positions in the axial direction of the shaft. At one position, the rotation of the winding member is transmitted as is, and at another position, it is transmitted via a slip mechanism,
Electricity is applied to the coil in accordance with the tape winding speed for playback, recording, fast forwarding or rewinding operations, and the winding member is moved up or down by utilizing the repulsion between the magnetic field of the permanent magnet and the magnetic field of the coil. The purpose is to change the rotational speed of the turntable by moving the turntable.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, in which the mechanism is seen from above, and 1 is a chassis base 2 which is a motor, 3 is a take-up side turntable, 4 is a payout side turntable, and 7 is a view showing a mechanism from above. The intermediate pulley, 5, is a forward flywheel, and 6 is a reverse flywheel. 14 is a recording/reproducing head, 15 is a forward pressure roller, 16 is a reverse pressure roller, and 17 is a cassette holder, which are arranged as shown in the figure. Moreover, as shown in FIG. 2, the head stand 18 is a head stand on which the recording/playback head 14 is mounted, and it is rotatably mounted around a fulcrum 15a, so that it rotates forward during playback and comes into contact with the tape. Perform playback. However, in the present invention, the switching to the reproduction mode will not be explained, and the winding method during reproduction will be described in detail below.
12 is a belt attached to motor pulley 1
3 is wound as shown in FIG. 3 to transmit the power transmitted from the wire. Anti-rolling flywheels 8 and 9 rotate in the opposite direction to the flywheels 5 and 6. FIG. 4 shows a state in which the power of the intermediate pulley 7 rotates integrally with the shaft 7a and is transmitted to the winding gear 11 which is constantly in mesh with the intermediate gear 10 press-fitted into the other side of the shaft 7a. ing. The take-up gear 11 rotates around the take-up gear shaft 21. Also the fourth
The figure shows the winding state in the regeneration state, where the winding gear 11 meshes with the gear 3b or 4b and the winding torque compression spring 26 shown in FIG.
The friction torque generated by the felt 3c or 4c is transmitted to the turntable 3 or 4, and the tape is wound with a constant torque. In this embodiment, a transmission mechanism such as felt is used, but the same effect can be obtained by using a method using permanent magnets, which has been increasingly used in recent years.

Figure 5 shows the state of the winding mechanism during regeneration, and at this time, when the belt is rotating counterclockwise,
The winding gear 11 is at a position 11a, and the tape is wound in a forward direction, that is, from left to right. Next, when the belt is rotating clockwise, the winding gear 11 is in position 11b, allowing the tape to be wound in the reverse direction, ie from right to left, for playback or recording. The winding gear shaft 21 has the N and S poles magnetized as shown in FIG.
As shown in FIG. 4, current is applied so that the lower side of the coil is the N pole and the upper side is the S pole, so that the arm 35 is energized by the torque generated by the frictional force between the shaft 21 and the bobbin 27. rotates around 35a. The direction of rotation is determined by the direction of rotation of the belt, and when the belt is rotating counterclockwise in FIG. 5, it moves to the position 11a, and when the belt rotates clockwise, it moves to the position 11b. Note that the arm 35 is rotated in the same manner as in conventional mechanisms.
It is also possible to design the gear 10 and the arm 35 so that frictional force is constantly generated.

Next, the case of fast forwarding and rewinding in this mechanism will be described. FIG. 6 shows the state of fast forwarding or rewinding, and FIG. 7 shows the gear meshing state. For the winding gear shaft 21 made of a permanent magnet, a current opposite to the current passed through the coil part 23 by the wire 24 during regeneration is passed to create an N pole on the upper side of the coil and an S pole on the lower side. The bearing part 2 is
2 and rotating the arm 35 by the force generated by the torque is the same as in the above-mentioned regeneration, and the engagement of the winding gear 11 with the small gear 3a or 4a. You can fast forward or rewind by pressing .

Next, FIG. 9 shows another method for vertically moving the winding gear 11. The permanent magnets 29 and 29' are fixed so that opposite sides thereof have the same polarity, for example, N pole.The bearing parts 30 and 30' and the winding gear shaft 32B are arranged to freely rotate and move up and down. put. However, the shaft 32 is not made of magnetic material. A magnetic material 31 is fixed to this shaft 32. Reference numeral 28 is a cylindrical magnetic material, and a coil 33 is wound around a bobbin 68, and the end of the coil 33 is taken out as a wire 34. Now, magnetic material 31
When the magnetic material 31 is magnetized and attracted by the upper magnet 29, when a current is passed through the coil 33 to generate a magnetic field in the opposite direction to the magnetization direction, the magnetic material 31
A repulsive force acts on the upper magnet 29 and an attractive force acts on the lower magnet 29', allowing the shaft 32 to move downward. It is also clear that if the current is applied in the opposite direction, the shaft 32 will move from the lower side to the upper side.

(Centering and Power Assist Mechanism) Next, we will explain the mechanism that uses the torque of the motor to bring the head and pressure roller into contact with each other in order to achieve the regeneration state, and the mechanism that ensures that the arm 35 is at the center when stopped. In FIG. 10, the relay gear 37 is always engaged with the flywheel gear 5a, and the trigger magnet 38 is fixed to the power assist gear 50, and at the same time has an N pole and an S pole.
The poles are magnetized as shown in FIG. 10, with a small gap between them and one end 39b of the regeneration magnet 39, so that the missing teeth 50e and 50f of the power assist gear 50 are positioned as shown in FIG. They are arranged as shown in the figure. Next, the case of entering the playback state will be explained. When trying to run the tape in the forward direction, a current is passed through the coil 39a so that the north pole appears at the part 39c and the south pole appears at the part 39d.The power assist gear 50 operates according to the principle of a motor as shown in Fig. 10. The toothless portion 50e starts to rotate counterclockwise, and the gear portion 37b of the relay gear 37
continues to rotate. Here, as shown in FIG.
The floats of 2b and 53b were held down, and 5 each.
The portions 2c and 53c are elastically fixed at predetermined positions by applying pressure inward at the portions 54a and 54b. Since the rotation has started in the counterclockwise direction, the cam portion 53a of the forward side rotating cam member 53
By lifting the pin portion 56a on the head plate operating member 56 upward in FIG. 13, the head plate operating member 56 is moved to the position indicated by the dashed line, and thereby the head plate 18 assumes the tape playback position. Become. At this time, the power assist gear 50 is the first
As shown in FIG. 4, the toothless portion 50e and the toothless portion 50f move to a position 180° different from when they are in the stopped state.
Then, the regenerating magnet 39 in FIG. 10 also rotates 180 degrees, so the N and S poles switch places and the magnetic material 39b
The S pole side approaches and stops. Further, the head plate operating member 56, which has finished lifting the head plate 18 to the tape playback position, has returned to the stop position. At this time the 15th
As shown in the figure, the protrusion 18a of the head plate 18 is
It moves to the position 18a' and locks it to the locking plate 57 to maintain the playback position. Reference numeral 58 denotes a spring member, which applies a biasing force to the locking plate 57 and the head plate operating member 56. Now that we have explained how to wind the tape, we will now explain what to do with the pressure roller. As shown in FIG. 16, the power assist gear 50 has integrally molded pins 50g and 50h, and when the mechanism is in a stopped state, these pins and the power assist gear 50 are designed to engage when rotation starts. A Geneva gear 59 having grooves 59h and 59g is arranged as shown in the figure. As explained in the previous section, when the power assist gear 50 starts rotating, when it rotates in the forward direction, that is, in the counterclockwise direction, the pin 50h
Since the groove 59h is engaged with the groove 59h, the Geneva gear 59 rotates clockwise. At this time, the Geneva gear is placed in the concave portion 59e of the brake elastic member 5 acting as a stopper.
Rotate against 5.

FIG. 17 shows the regeneration state on the forward side, and the position of the pressure roller selection member 60 is changed from the stopped state position indicated by the dashed line to the position where forward regeneration is possible via the U-shaped groove 60g that is constantly engaged with the round pin portion 59i. It moves by the engagement between the pin 50h and the groove 59h mentioned above and is stopped by locking between the brake elastic members 55 and 59f. In this state, the bent portion 60b' which was at the stop position moves to the position 60b as shown in the figure, and the protrusion 60b of the reverse pressure roller arm 66
a downward, that is, so that the pressure roller 16 does not drive the tape, and a similar bend on the forward side located at the position 60c'.
The protrusion 6 of the forward side pressure bonding roller arm 65 of
5a is made free and moved forward by the compression spring 19 so that the tape can run. At this time groove 59g, 5
9h is nearby and separate brake elastic member 5
The reason why the pressure roller selection member 60 is arranged is that the pressure roller selection member 60 is operated at a point earlier than the speed at which the head 14 advances, and the pressure roller selection member 60 is moved with a light force. This is to enable operation, and is the best method for attaching it to small, handy-type mechanisms that operate at a voltage of about 3V. Further, when reproducing on the reverse side, it can be realized by rotating the power assist gear 50 in the opposite direction to the method described above, so a description thereof will be omitted.

[Stopping operation] (Stopping from fast forwarding or rewinding) When stopping a set that is in the fast forwarding or rewinding state, first set the gears engaged in positions 11c and 11d in Fig. 6 to the stop position. The current flow is changed so as to rotate the motor 2 in the direction opposite to the direction in which the motor 2 is fast forwarded or rewinded. Then, the arm 35 returns to the center due to the frictional force generated by passing current through the felt, permanent magnet, or coil described above, and the gears are separated from each other. Here, positioning of the arm 35 will be explained. A groove 35b is cut in the arm 35 to form a convex shape 35.
A groove is formed in c to determine the center position of the arm, and this part is used as the reference position for centering. Next, a center positioning member 61 of the arm 35 is provided, which is rotatably arranged around a fulcrum 61a, and a magnetic member 62 is fixed to the member 61 with a slight degree of freedom, and a pin portion 61b is the groove portion 35b
and is in contact with the groove portion 35c. Next, reference numeral 63 is an on-type magnet, that is, a magnet that has both a permanent magnet and a coil, and when a current is passed through the coil 64, the force of the permanent magnet disappears and the arm 61 becomes free, so it is fast forwarded as described above. Or you can rewind. As described above, when the stop button is pressed next to stop the motor 2, the motor 2 is rotated in the opposite direction to the direction in which it was previously rotating, the gears are disengaged, and the motor 2 returns to the center. The arm 35 that has returned here is the cam groove 35
c, the arm positioning member 61 is rotated clockwise around 61a to bring the magnetic material 62 close to the point where it contacts the on-type magnet 63. Then, by the attractive force of the permanent magnet of the magnet 62, the arm positioning member 61 engages the pin portion 61b with the groove portion 35c and holds the arm 35 at the center. After that, the rotation of the motor 2 is stopped to bring it to a stopped state.

[Method of changing from playback mode (forward or reverse) to stop state] The method of changing from playback mode to stop state will be explained for the forward state, and when it is in reverse, the reverse is the case, so redundant explanation will be omitted. Therefore, in the previous forward playback state, the trigger magnet 38 is rotated 180 degrees from the N and S pole positions in the stop state shown in FIG.
It is a pole and a north pole. Next, when the stop button is pressed, current flows through the regeneration magnet 39, and the power assist gear 50 begins to rotate clockwise around 50a. Next, the motor 2 rotates clockwise, which is opposite to the rotation direction in the regeneration state, and the power assist gear 50 engages with the relay gear 37 and reverses. At this time, as shown in FIG. Since the force of the spring 58 has returned the pin part 56a
In accordance with the rotation of the power assist gear 50, the forward-side rotary cam member 53 becomes elastic as the forward-side rotary cam member 53 moves on the inner surface 53d (second locus) opposite to the cam portion 53a of the forward-side rotary cam member 53. Since it rotates to the left about 53d against the member 54, the pin portion 56a can maintain its downward position. If the current flowing through the regeneration magnet 39 is cut off while the gear 50 is rotating and the gear 50 returns to its original stop position, the pin 50h and the groove 59h of the Geneva gear 59 will stop the gear 50 in the form shown in FIG.
By returning , the pressure roller selection member 60 is returned to the stop position. Also, it is necessary to unlock the lifted head plate 18, and for this purpose the stop gear 51
, the relay gear 3 is connected to the power assist gear 50.
7, and this gear has a cam portion 51a, and the gear 51 has a cam portion 51a.
is equipped with a compression spring 67 and a convex portion 5 so that it always stops at a fixed position after rotating during playback.
1b and the concave portion of the basic chassis 1, and since it is positioned symmetrically to the relay gear 37, it does not rotate during playback. During playback, 18a is locked at the position 18a' because it is in a position where it does not kick 57b in FIG.
Next, when the stop gear 51 starts rotating, it kicks the lock plate 57 to the left and locks the head plate 1, as shown in FIG.
Remove lock 8.

〔Effect of the invention〕

According to the present invention described above, a shaft that is driven by the rotation of a motor capable of forward and reverse rotation is disposed between a pair of turntables, and is rotationally coupled to this shaft and rotates in accordance with the rotational direction of the motor. A winding member is rotatably coupled to one of a pair of turntables and driven to rotate, and this winding member is made vertically movable using a permanent magnet and a coil, and switching between this vertical motion is used for playback, recording, and fast forwarding. Or, in response to switching the tape winding speed during rewinding, electricity is applied to the coil and the repulsion between the permanent magnet and the coil is used, so the current can be made very small. The ability to switch is epoch-making, and since it has become possible to use only one motor, the mechanism can be economical and simple. Based on the above, the use of this mechanism makes it possible to create a compact cassette tape recorder operated by feather touch, and has great industrial value.

[Brief explanation of drawings]

Fig. 1 is a front view of a mechanism showing an embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a front view showing the rotation system of the mechanism of the invention, and Fig. 4 is a regeneration state of the switching mechanism. Fig. 5 is a winding state diagram during playback, Fig. 6 is a winding state diagram during fast forwarding and rewinding, and Fig. 7 is a winding state diagram during playback.
The figure is a sectional view during fast forwarding and rewinding, FIG. 8 is a sectional view of the turntable, FIG. 9 is a sectional view of a main part showing an embodiment of the switching mechanism, and FIG. 10 is a tomographic view of FIG. 1. FIGS. 11a and 11b are views showing the power assist section, FIG. 12 is a perspective view of the power assist cam, and FIGS. 13 to 18 are diagrams illustrating the operation of the power assist. 1: Basic chassis, 2: Motor, 3: Right turntable, 4: Left turntable, 5: Forward flywheel, 6: Reverse flywheel,
8, 9: anti-rolling flywheel, 7: intermediate pulley, 10: intermediate gear, 11: winding gear,
12: Drive belt, 15: Forward pressure roller, 16: Reverse pressure roller, 19, 20: Pressure spring, 21: Winding gear shaft, 22: Bearing section, 23: Winding coil, 24: Wire rod, 25: Compression spring , 17: Cassette holder, 26: Compression spring for winding torque, 18: Head plate, 2
7: bobbin, 28: core part, 29, 29': permanent magnet, 30, 30': bearing part, 31: iron-based magnetic material,
32: Intermediate pulley shaft, 33: Coil, 3
4: Wire rod, 35: Arm, 36: Iron plate bottom plate, 3
7: Relay gear, 5a: Flywheel gear, 38:
Trigger magnet, 39: Regeneration magnet,
50: Power assist gear, 51: Stop gear, 5
2: Reverse rotating cam member, 53: Forward rotating cam member, 54: Elastic member, 55: Brake elastic member, 56: Head plate operating member, 57:
Lock plate, 58: Spring member, 59: Geneva gear, 6
0: Pressure roller selection member, 65: Forward side pressure roller arm, 66: Reverse side pressure roller arm, 61: Arm positioning member, 62: Magnetic member, 63: On-type magnet, 64:
Coil, 67: Compression spring, 68: Bobbin.

Claims (1)

[Claims] 1 a motor capable of forward and reverse rotation; a shaft disposed between a pair of turntables and driven by the rotation of the motor; A winding member coupled to one side of the table and driven to rotate; the winding member being movable up and down in two positions in the axial direction of the shaft; in one position, the rotation of the winding member is directly transmitted; and in the other position; A vertically movable means comprising a permanent magnet and a coil transmits the transmission through a slip mechanism, and current is applied in opposite directions to the coil in accordance with the tape winding speed of playback or recording and fast forwarding or rewinding operations, The winding member is moved to the opposite side by utilizing the repulsion between the magnetic field of the permanent magnet, which is biased to one side by the permanent magnet, and the magnetic field of the coil, and the shaft is held by the permanent magnet. and switching means for changing the rotational speed of the turntable.