JPH043581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a tape recorder, and more particularly to an operation switching device for a tape recorder configured to switch operations using the rotational force of an electric motor.

(B) Prior art There are two types of operation switching devices for tape recorders: a mechanical type in which the drive mechanism is switched by pressure applied to a switching button, and an electronic type in which the drive mechanism is switched by the suction force of a plunger. However, recently, devices that use the rotational force of an electric motor to perform switching have become popular. A conventional technique for switching operations using the rotational force of an electric motor is disclosed in Japanese Utility Model Application Publication No. 1983-62461.
Such technology is configured to perform operation switching by meshing a switching gear that performs operation switching with a driving gear that rotates when the rotation of the electric motor is transmitted during operation switching operation, but the meshing of such gears is difficult. The operation, that is, the trigger operation, is performed by pressing force on the operation button. Although the method in which the trigger operation is performed by pressing force on the operating button is smaller than the above-mentioned mechanical method, the operability is not very good. Furthermore, in such an operation switching device, a technique for performing the trigger operation using the suction operation of the plunger is disclosed in Japanese Utility Model Application No. 58-69351; The shape of the plunger had to be large in order to perform the action, making it unsuitable for downsizing tape recorders.

(c) Object of the Invention The present invention aims to provide an operation switching device that performs operation switching using the rotational force of an electric motor and is suitable for a small tape recorder.

(D) Structure of the Invention The present invention provides a drive gear that rotates as the rotation of an electric motor is transmitted by a belt or the like, a trigger member that is displaced from a non-trigger position to a trigger position when a trigger is operated in conjunction with a regeneration operation, and the trigger. a switching gear that meshes with the driving gear and rotates a predetermined amount by transmitting the rotation of the driving gear when the member is displaced to the trigger position; a switching cam and a return cam that rotate together with the switching gear; and the switching cam. It is comprised of a switching sliding plate which is moved to the operating position by rotation of the magnetic head and which causes the drive mechanism and the magnetic head to enter the reproducing operating state.

(E) Examples The drawings all relate to the operation switching device of the present invention.
FIG. 1 is a plan view showing the stopped state, FIG. 2 is a plan view of the main parts when the regeneration operation is started, and FIG. 3 is a plan view of the main parts showing the state in the middle of switching to the regeneration operation state.
FIG. 4 is a plan view of the main parts showing the reproduction operation state. In the figure, reference numeral 1 is attached to a fixed base plate by a shaft 2 so as to be rotatable between a stop position and a playback operation position, and is urged by a spring 3 in the direction of the stop position, that is, counterclockwise. It is a rotating plate with a magnetic head (not shown) attached thereto, and an engaging pin 4 formed on the lower surface. Reference numeral 5 indicates a positioning pin for the rotating plate 1. 6
A pinch roller arm is rotatably mounted on the rotary plate 1 by a shaft 7, and a pinch roller 8 is rotatably mounted thereon. 9
10 is a drive gear mounted to rotate together with the capstan shaft 9; 11 is a drive gear mounted to rotate together with the capstan shaft 9; The drive roller 12 is a switching gear which meshes with the drive gear 10 and is driven to rotate when the tape recorder is switched to the playback mode, and also switches the tape recorder to the playback mode, and some of its teeth are provided with missing teeth 13. It is being A switching cam 14, a control cam 15, and a blocking piece 16 are formed on the top surface of the switching gear 12, and a return cam 17 is formed on the bottom surface. Reference numeral 18 denotes a first electromagnet in which a permanent magnet is incorporated, and when energized, generates a magnetic flux in a direction that weakens the attraction force of the permanent magnet, and when a regeneration operation is performed, a driving current is supplied for a short time. It is configured as follows. Reference numeral 19 denotes a first trigger member which is rotatably attached to a fixed substrate by a shaft 20, and is formed with a suction portion 21 that is attracted by the first electromagnet 18, and is actuated by a spring 22. It is biased to rotate counterclockwise. The biasing force of the spring 22 is such that when the first trigger member 19 is in the non-trigger position, that is, the attracting portion 21 is attracted by the permanent magnet incorporated in the first electromagnet 18, the first trigger member 19 is It is set so that it cannot be rotated, and it is set so that it can be rotated when the first electromagnet 18 is energized. 23 is rotatably attached to a fixed base plate by a shaft 24, and is connected to the first trigger member 1.
The first connecting pin 25 is rotated in conjunction with the first connecting pin 25.
A first control arm 26 that cooperates with the return cam 17 formed on the switching gear 12 and a second control arm 27 that cooperates with the blocking piece 16 are connected by a second trigger member. It is formed. A spring 28 has one end fixed to the shaft 24 and contacts the control cam 15 formed on the switching gear 12 to urge the switching gear 12 to rotate in the direction of meshing with the drive gear 10. It is. Reference numeral 29 indicates a supply reel shaft, 30 indicates a take-up reel shaft, and 31 indicates a take-up roller rotatably mounted coaxially with the take-up reel shaft 30, whose rotation is caused by a clutch (not shown). and is configured to be transmitted to the take-up reel shaft 30. 32 is attached so as to be displaceable in the directions of arrows A and B while being guided by guide pins 33 and 34, and a second trigger member 32 is displaceable in accordance with the rotational displacement of the second trigger member 23
This is an operation control board connected by a connecting pin 35, and controls the operation of the drive mechanism for fast forwarding and rewinding to the take-up reel shaft 30 and the supply reel shaft 29 when the board is displaced in the direction of arrow A. It has a blocking effect. Reference numeral 36 designates a switching sliding plate which is mounted so as to be displaceable in the directions of arrows A and B by means of guide pins 37, etc., and 38 designates a control pin formed on the switching sliding plate 36, which is connected to the switching gear 12. It has the effect of displacing the switching sliding plate 36 in the direction of arrow A in cooperation with the switching cam 14 formed therein. 39 is an engagement hole formed in the switching sliding plate 36 and engaging with the engagement pin 4 formed in the rotating plate 1; At the time of displacement, the rotating plate 1 has the function of rotating and displacing the rotating plate 1 in the clockwise direction, which is the reproducing operation position. 40 is a lock pin formed on the switching sliding plate 36, and 41 is a shaft 4 formed on the fixed board.
2, and is biased counterclockwise by a spring 43, and is provided with a lock portion 44 that engages with the lock pin 40 and a suction portion 45. There is. Reference numeral 46 denotes a second electromagnet to which power is supplied when a regeneration operation is performed and to which power is supplied during the regeneration operation state. In such a configuration, the biasing force of the spring 43 alone cannot lock and hold the switching sliding plate 36 at the operating position, that is, the position displaced in the direction of arrow A. 47 is a control portion formed on the switching sliding plate 36; 48 is provided with an abutment pin 49 that abuts on the switching sliding plate 36, and its displacement position is regulated by displacement of the switching sliding plate 36; When the switching sliding plate 36 is in the operating position, the driving roller 11 and the winding roller 3
A transmission roller 50 that is pressed against the roller 1 is rotatably mounted. In such a configuration, when the switching slide plate 36 is in the operating position, it is configured to prevent operation of the drive mechanism for fast forwarding and rewinding the take-up reel shaft 30 and the supply reel shaft 29. The operation switching device of the present invention is constructed as described above, and its operation will be explained next.

In the stopped state shown in FIG. 1, the first trigger member 19 is in a non-triggering position where its attracting portion 21 is attracted by a permanent magnet incorporated in the first electromagnet 18. Therefore, the second trigger member 23 connected to the first trigger member 19 is also in the non-triggering position, and the second control arm 27 formed on the second trigger member 23 is formed on the switching gear 12. abuts against the blocking piece 16, and the switching gear 1
This state prevents meshing with the drive gear 10 of No. 2. Further, the rotary plate 1 is displaced and held at the stop position by the biasing force of the spring 3. The switching sliding plate 36 is kept displaced in the direction of arrow B, which is the non-operating position, by the urging force received from the engagement pin 4 formed on the rotating plate 1. When the user performs a regeneration operation in such a stopped state, power is supplied to the electric motor, power is supplied to the first electromagnet 18 for a short time, and power is supplied to the second electromagnet 4.
Power is supplied to 6. When power is supplied to the first electromagnet 18 for a short time, the attraction force of the permanent magnet incorporated in the first electromagnet 18 is weakened, and as a result, the first trigger member 19 is triggered by the biasing force of the spring 22. It is rotationally displaced to the position.
When the first trigger member 19 is pivoted to the trigger position, the second trigger member 23 connected to the first trigger member 19 is also pivoted clockwise, which is the trigger position. When the second trigger member 23 is rotationally displaced to the trigger position, the second
Operation control plate 3 connected to trigger member 23
2 is displaced in the direction of arrow A, and the drive mechanism to the reel shaft is prevented from operating. When the second trigger member 23 is rotated to the trigger position, the second control arm 27 and the blocking piece 16 formed on the switching gear 12 are released from contact. As a result, the switching gear 12 is slightly rotated clockwise by the biasing force of the spring 28, and the driving gear 10 is driven to rotate by supplying power to the electric motor.
meshes with FIG. 2 shows a state in which the above-described operations associated with the playback operation have been performed. When the switching gear 12 meshes with the driving gear 10 in this manner, the rotation of the driving gear 10 is transmitted to the switching gear 12, causing the switching gear 12 to rotate clockwise. When the switching gear 12 rotates clockwise, the switching cam 14 formed on the switching gear 12 also rotates, so that the control pin 38
is displaced by a displacement force in the direction of arrow A. Further, when the switching gear 12 rotates clockwise, the return cam 17 rotates, comes into contact with the first control arm 26 of the second trigger member 23, and presses and displaces the second trigger member 23 counterclockwise. FIG. 3 shows a state in which such an operation is performed.
When the switching gear 12 further rotates clockwise from this state, the control pin 38 is further displaced in the direction of arrow A, and the second trigger member 23 is further rotationally displaced counterclockwise. When the second trigger member 23 rotates counterclockwise, the operation control plate 32 connected to the second trigger member 23 is displaced in the direction of arrow B, and the first trigger member 19 is rotationally displaced clockwise. It will be done.
When the first trigger member 19 is rotated to a predetermined position, the attraction portion 21 formed on the first trigger member 19 is attracted by the permanent magnet incorporated in the first electromagnet 18, and the first trigger is Part 1
9 will be held in the non-trigger position. The second trigger member 19 is therefore connected to the first trigger member 19.
Trigger member 23 is also held in the non-trigger position. As a result, the switching gear 12
When the switching gear 1 rotates once due to meshing with 0, the switching gear 1
2 and the second control arm 27 formed on the second trigger member 23 come into contact with each other, so that after the switching gear 12 is disengaged from the drive gear 10 by the toothless portion 13. Re-meshing movement is prevented. When the switching gear 12 rotates once in this manner, the switching cam 14 formed on the switching gear 12 also rotates once, and as the switching cam 14 rotates, the control pin 38 is pressed in the direction of arrow A, so that the control pin 38 is pushed in the direction of arrow A. The switching slide plate 36, on which 38 is formed, is moved to an operating position in the direction of arrow A. When the switching sliding plate 36 is moved to the operating position, a locking pin 40 formed on the switching sliding plate 36 engages with a locking portion 44 of a locking member 41. In such a state, since power is supplied to the second electromagnet 46, the lock pin 40 is held locked by the lock portion 44 of the lock member 41, and the switching sliding plate 36 is moved as shown in FIG. held in operating position. In this way, the switching sliding plate 36
When the switch is moved to the operating position, the edge of the engagement hole 39 formed in the switching sliding plate 36 displaces the engagement pin 4 formed in the rotating plate 1 in the direction of arrow A. As a result, the rotating plate 1 is rotated clockwise and held at the playback operation position. When the rotary plate 1 is held at the reproducing operation position, the magnetic head contacts the magnetic tape and the pinch roller 8 is pressed against the capstan shaft 9. Also, the switching sliding plate 3
6 is displaced to the operating position, the displacement plate 48 is displaced to the operating position due to the relationship between the control unit 47 and the contact pin 49, and the transmission roller 50 is pressed against the drive roller 11 and the winding roller 31. FIG. 4 shows a reproducing operation state constituted by such a switching operation.

Although the switching to the reproducing operation state is performed as described above, the operation when the stop operation is performed from the reproducing operation state will be explained next. If a stop operation is performed while the tape recorder is in a reproducing operation state, the power supply to the second electromagnet 46 is cut off. When the power supply to the second electromagnet 46 is cut off, the locking force of the locking member 41 to lock the locking pin 40 becomes insufficient, and the switching sliding plate 36 is displaced in the direction of arrow B by the biasing force of the spring 3. Further, the rotating plate 1 is also rotationally displaced from the regeneration operation position to the stop position by the biasing force of the spring 3. As the switching sliding plate 36 is displaced in the direction of arrow B, the displacement plate 48 is displaced to the non-operating position.
The transmission roller 50 is separated from the drive roller 11 and the winding roller 31. When a stop operation is performed from the playback operating state shown in FIG. 4, the above-described operations are performed and the tape recorder enters the stopped state shown in FIG. 1.

(f) Effects of the Invention The operation switching device of the present invention is incorporated into an electromagnet that is configured to include a permanent magnet and generate magnetic flux in a direction that weakens the attraction force of the permanent magnet when energized. The trigger member is held in the non-trigger position by the attraction force of the permanent magnet, and when the trigger is operated in conjunction with the regeneration operation, the attraction force is reduced due to the energization of the electromagnet, and the trigger member is displaced to the trigger position to enter the regeneration operation state. The switching gear and the driving gear are engaged with each other, and a return cam formed on the switching gear moves the trigger member in the trigger position to a permanent position built into the electromagnet. Since the trigger member is returned to the non-trigger position where it is attracted and held by a magnet, that is, the rotational force of the electric motor is used to return the trigger member to the non-trigger position. Compared to a technique in which the return operation is performed by the urging force of a spring, there is no reaction force that is the urging force of the spring, so it has the advantage that the force required to perform the trigger operation is small. are doing. Therefore, the device such as a plunger used as a means for performing a trigger operation can be made smaller, and the present invention has a very large effect on downsizing of tape recorders.

[Brief explanation of drawings]

The drawings all relate to the operation switching device of the present invention,
FIG. 1 is a plan view showing the stopped state, FIG. 2 is a plan view of the main parts when the regeneration operation is started, and FIG. 3 is a plan view of the main parts showing the state in the middle of switching to the regeneration operation state.
FIG. 4 is a plan view of the main parts showing the reproduction operation state. Explanation of main drawing numbers, 1... Rotating plate, 8... Pinch roller, 9... Capstan shaft, 10... Drive gear, 11... Drive roller, 12... Switching gear, 14... Switching cam , 16... blocking piece, 17
... Return cam, 18... First electromagnet, 19... First trigger member, 23... Second trigger member, 2
6...First control arm, 27...Second control arm, 36...Switching sliding plate, 38...Control pin, 4
0...Lock pin, 41...Lock member, 46...
...Second electromagnet.

Claims (1)

[Claims] 1. A driving gear that rotates when the rotation of the electric motor is transmitted by a belt or the like, and an electromagnet that incorporates a permanent magnet and is configured to generate magnetic flux in a direction that weakens the attraction force of the permanent magnet when energized. When it is in the non-trigger position, it is held in the non-trigger position by the attraction force of a permanent magnet built into the electromagnet, and when the trigger is operated due to a regeneration operation, the attraction force is reduced due to the energization of the electromagnet, and the magnet is moved to the trigger position. a trigger member that is displaced; a switching gear that meshes with the driving gear and rotates a predetermined amount by transmitting the rotation of the driving gear when the trigger member is displaced to the trigger position; and a switching gear that rotates together with the switching gear. It consists of a switching cam and a return cam formed in the cam, and a switching sliding plate which is moved to the operating position by the rotation of the switching cam and puts the drive mechanism and the magnetic head into the reproducing operating state, and is used for reproducing operation. At the time of accompanying trigger operation, rotation of the switching cam displaces the switching sliding plate to the operating position, and rotation of the return cam causes the trigger member in the trigger position to be attracted and held by a permanent magnet incorporated in the electromagnet. An operation switching device for a tape recorder, characterized in that the tape recorder is returned to a non-trigger position.