JPH08329562A - Tape recorder - Google Patents

Abstract

PURPOSE: To enable the changeover of the revolutional speed of a motor just before the end of a cassette tape in the state of fast forwarding or unwinding operation by mounting the motor capable of changing over the revolving speed stepwise by providing an electronic governor circuit. CONSTITUTION: A forward flywheel 4 is rotated counterclockwise, but the rotational force of the forward flywheel 4 is not transmitted to a cam gear 7, since the cam gear 7 is engaged with a locking shaft 22b of a trigger lever 22 at the locking part 7f and its tooth lacked part 7c is controlled to the position confronted to a gear part 4b of the forward flywheel 4. The connection for each gear step in the thrust direction is held by holding an engaging part 13d of a winding arm 13 by a holding part 71 of a thrust cam part 7j of the cam gear 7, and the connection for each gear step in the radial direction is held by holding an engaging shaft 24b of a take-up lever 24 by a thrust cam part 7m of the cam gear 7 when the operation is in the forward recording/ reproducing state, and by a thrust cam part 7n of the cam gear 7 when the operation is in the inverse recording/reproducing state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder mechanism for gradually changing the number of rotations of a reel base.

[0002]

2. Description of the Related Art In recent years, as the cost of audio equipment has been reduced, further improvement in operability and higher quality have been demanded. High-speed F that improves the operability and improves the quality by reducing the fast-forward and rewind times.
Mechanisms equipped with F / REW functions are becoming popular.

In a conventional tape recorder, high speed FF /
In order to realize the REW function, the motor for driving the capstan shaft that runs the cassette tape at a constant speed and the motor for driving the forward and reverse reel bases for winding the cassette tape are separated to form a two-motor mechanism. For the motor that drives the capstan shaft, use a motor that is equipped with an electronic governor circuit and is controlled to a constant number of revolutions if the motor supply voltage is within a certain range, while driving the forward and reverse reel bases. The motor used is a type in which the motor supply voltage is proportional to the motor rotation speed, and the motor supply voltage is changed to switch the rotation speed of the forward rotation and reverse rotation reel bases. It was designed to be shortened. In addition, the winding position of the cassette tape is detected by the detection means that detects the number of rotations of the forward rotation and reverse reel bases, and fast-forwarding at high speed rotation,
The motor supply voltage is changed immediately before the end of the cassette tape in the rewinding operation state, and the rotation speed of the motor is switched to the low speed rotation, so that the mechanism tape is disengaged or the gear jumps due to the end of the cassette tape entering at the high speed rotation.
It was designed to prevent breakage and damage of the cassette tape.

[0004]

However, the conventional tape recorder as described above is a motor for driving the forward and reverse reel bases separately from the motor for driving the capstan shaft in order to realize the high speed FF / REW function. Therefore, the cost was inevitably increased by adding a motor, which is extremely expensive among the tape recorder mechanism components. In addition, the added motor is generally of the type in which the motor supply voltage is proportional to the motor speed, and the voltage fluctuates under the influence of variations in the component accuracy of the voltage control circuit and temperature changes, causing the motor to rotate at a constant speed. Since it is difficult to control with, the problem is that the cassette tape fast-forwarding and rewinding time are not stable.

In view of the above-mentioned conventional problems, the present invention provides a mechanism for gradually changing the number of rotations of the reel base of the tape recorder, which is equipped with an electronic governor circuit and which is capable of rotating the motor forward and backward in stages. The cassette reel is connected to the reversing reel stand, and the rotation speed is switched in the fast-forwarding and rewinding operation states, and the winding position of the cassette tape is detected by the detection means that detects the rotation speed of the forward and reverse reel stand, and the fast-forwarding and rewinding operations are performed. High quality, high reliability, by switching the rotation speed again immediately before the end of the cassette tape
High speed FF / RE of tape recorder mechanism at low cost
The purpose is to realize the W function.

[0006]

In order to solve the above-mentioned problems, a tape recorder according to the present invention is a tape recorder mechanism equipped with an electronic governor circuit and capable of gradually changing the number of revolutions. It is configured to realize the normal recording / playback, reverse recording / playback, fast-forward, and rewind mechanism each operation mode state by transmitting the driving force of However, the number of rotations of the motor is switched in the fast-forward and rewind operation states.

Further, the tape recorder of the present invention comprises a detecting means for detecting the number of rotations of the forward rotation and reverse reel bases, and the detecting means detects the winding position of the cassette tape for fast forward and rewind operations. In this state, the rotation speed of the motor is switched immediately before the end of the cassette tape.

[0008]

According to the tape recorder of the present invention, the tape recorder mechanism is equipped with the motor having the electronic governor circuit and capable of switching the rotation speed in stages.
Forward rotation recording / reverse recording / reverse recording / fast forward by transmitting the driving force of the motor to the forward rotation / reversal reel table for winding the cassette tape and the capstan shaft for traveling the cassette tape at a constant speed through mechanism components. , Rewinding mechanism It is configured to realize each operation mode state, and in the fast-forwarding and rewinding operation state, the motor runs the cassette tape at a prescribed speed from a constant rotation speed at a constant speed to a constant rotation set at a high speed. The number of rotations of the forward or reverse reel table is increased by switching the number to the desired value, and a high-speed FF / REW function for reducing the fast-forwarding and rewinding time of the cassette tape can be realized.

Further, the tape recorder of the present invention is provided with a detecting means for detecting the number of rotations of the forward rotation and reverse reel bases by a photo sensor, a hall element or the like. The winding position of the cassette tape is detected by detecting the difference in the number of rotations on the supply side, and immediately before the end of the cassette tape in the fast-forward or rewind operation state during high-speed rotation or immediately before the brake mechanism is activated by the mechanism stop command, The rotation speed of the motor is switched from a constant rotation speed set at a high speed to a constant rotation speed at a constant speed for running the cassette tape at a predetermined speed.

The tape recorder of the present invention is a mechanism constructed as described above, and is equipped with an electronic governor circuit used for realizing the high-speed dubbing function of the conventional tape recorder mechanism, and the rotation speed is gradually changed. A motor that can
It is configured to switch the rotation speed even in the fast-forward and rewind operation states, and it is not necessary to add a motor, which is extremely expensive among the tape recorder mechanism component parts, and the constant speed rotation speed and high speed. Regarding the switching of the rotation speed, the motor according to the present invention is a type of motor that is controlled to a constant rotation speed as long as the motor supply voltage is within a predetermined range, and the rotation speed switching electric circuit has a simple configuration only for switching the resistance value. Therefore, like a conventional motor of a type in which the motor supply voltage is proportional to the motor rotation speed, the voltage fluctuates due to variations in component accuracy of the voltage control circuit and temperature changes, and the motor is controlled at a constant rotation speed. It is difficult to fast-forward the cassette tape and the rewind time is not stable. It is possible to prevent disengagement of mechanism components, jumping of gears, breakage of cassette tape, damage, etc. by rushing the end of the set tape or operating the brake mechanism when a mechanism stop command is issued. High speed FF of tape recorder mechanism at cost
The purpose is to realize the / REW function.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a plan view showing the construction of each part of a tape recorder according to an embodiment of the present invention, and FIG. 2 is a partial side view thereof, each showing a mechanism stopped state. 3 to 11 are a partial plan view and a partial side view showing the configuration of each rotary system component.

1 to 11, reference numeral 2 denotes a motor, the motor 2 is fixed on a mechanical chassis 1, and a motor pulley 3 is press-fitted and held on a rotary shaft 2a thereof.
Reference numeral 4 is a forward rotation flywheel, 5 is a reverse rotation flywheel, and the forward rotation capstan 4a and the reverse rotation capstan 5a are press-fitted and held on the respective rotary shafts, and the forward rotation flywheel 4 has a gear portion 4b. There is. Reference numeral 6 denotes a capstan belt. The capstan belt 6 connects the motor pulley 3, the forward rotation flywheel 4, and the reversal flywheel 5 to apply the counterclockwise rotational force of the motor 2 to the forward rotation flywheel 4,
It is transmitted to the reverse flywheel 5. Reference numeral 7 denotes a cam gear, which is rotatably held around a support shaft 1a on the mechanical chassis 1, and has a gear portion 7a, a toothless portion 7b, and
7c and 7d, and as shown in FIG.
In a, the gear portion 4b of the forward rotation flywheel 4 is in a meshable positional relationship, and in the meshed state, the counterclockwise rotational force of the forward rotation flywheel 4 is transmitted to rotate clockwise, but the toothless portion is present. When 7b, 7c, and 7d are in a position facing the gear portion 4b of the forward rotation flywheel 4, they cannot mesh with each other and the rotational force of the forward rotation flywheel 4 is not transmitted. Reference numeral 8 is a main pulley, 9 is a take-up gear, and as shown in FIG. 3, the main pulley 8 is rotatable around a shaft portion 9a of the take-up gear 9 as a supporting shaft and is connected to the take-up gear 9 through a friction mechanism. Has been done. That is, the friction spring 10 whose one end is fixed to the winding gear 9 presses the friction plate 11 which is slidable in the thrust direction and fixed in the radial direction by the winding gear 9 and the key groove 9b, and the felt 12 is pressed. The rotational force is transmitted between the main pulley 8 and the take-up gear 9 by the frictional force between and. Further, the main pulley 8 has a V groove portion 8a and a gear portion 8
b, the winding gear 9 has a gear portion 9c. Reference numeral 13 is a winding arm, and 14 is a winding belt. The winding arm 13 is rotatable around a support shaft 1b on the mechanical chassis 1 and slides in a thrust direction (arrow AB direction) as shown in FIG. The take-up gear 9 is rotatably held, and the rotary shaft portions 9d and 9e of the winding gear 9 are rotatably held by the bearing portions 13a and 13b. The winding belt 14 is the V groove portion 4 of the forward flywheel 4.
c, the V groove portion 8a of the main pulley 8 is connected, and the counterclockwise rotational force of the forward rotation flywheel 4 is transmitted to the main pulley 8. 15 is a take-up relay gear, 16 is a fast-forward relay gear,
Reference numeral 17 is a forward rotation reel stand, and 18 is a reverse reel stand. The take-up relay gear 15 is rotatably held around the support shaft 1c on the mechanical chassis 1, and the fast-forward relay gear 16 is rotatably held about the support shaft 1d on the mechanical chassis 1. Both the forward rotation reel stand 17 and the reverse reel stand 18 are rotatable around a rotation support shaft 19 press-fitted and held on the mechanical chassis 1, and are prevented from coming off in the thrust direction by a washer 20. Further, the forward rotation reel stand 17 and the reverse reel stand 18 are provided with take-up gear portions 17a, 18 respectively.
a, fast-forward gears 17b and 18b, reel claws 17c and 18c for engaging the hub of the cassette half and winding the tape
have. Further, as shown in FIG. 5, the forward rotation reel stand 17 has a take-up gear portion 17a constantly meshed with the take-up relay gear 15, and a fast-forward gear portion 17b always meshes with the fast-forward relay gear 16.
Further, as shown in FIG. 6, the reverse reel base 18 is arranged so that the fast-forward gear portion 18b always meshes with the fast-forward relay gear 16. 21 is a solenoid, and the solenoid 21
Is fixed on the mechanical chassis 1 and has a movable iron core 21a that performs a suction operation when energized. Reference numeral 22 denotes a trigger lever, and the trigger lever 22 is rotatably held around a support shaft 1e on the mechanical chassis 1. The connecting portion 22a with the movable iron core 21a of the solenoid 21 and the cam gear 7 are locked. The cam gear 7 is locked at the portions 7e, 7f, 7g, and the locking shaft 22b is provided to restrict the gear portion 4b of the forward flywheel 4 and the toothless portions 7b, 7c, 7d of the cam gear 7 to face each other. There is. Reference numeral 23 denotes a spring, and the spring 23 is held on the mechanical chassis 1, one end is fixed to the holding portion 1f, and the other end is held by the holding portion 22c of the trigger lever 22, so that the trigger lever 22 is always clockwise. Is urged to rotate to the contact portion 2 of the trigger lever 22.
The position is regulated in the clockwise direction by bringing 2d into contact with the stopper portion 1g on the mechanical chassis 1. 24
Is a winding lever, and the winding lever 24 is a mechanical chassis 1.
The upper support shaft 1b serves as a bearing and is rotatable, and the hook portion 1l on the mechanical chassis 1 and the claw portion 24a of the winding lever 24 are rotatable.
By engaging with, the slip-out prevention in the thrust direction is made. The take-up lever 24 has an engaging shaft 24b engageable with the radial cam portions 7i, 7m, 7n, 7o, 7q, 7r of the cam gear 7, and a connecting portion 24c for connecting the take-up arm 13 only in the radial direction. ing. 25 is a spring, and one end of the spring 25 is the winding arm 1
3, the other end is held by the take-up lever 24, and constantly biases the take-up arm 13 in the direction of the arrow A to make the take-up arm 13
The position of the rotary boss end surface 13e is regulated in the arrow A direction by contacting the bearing surface 1m of the support shaft 1b on the mechanical chassis 1. In addition, the cam gear 7 has a winding arm 1
A thrust cam portion 7j that is engageable with the engaging portion 13d of No. 3 and that causes the winding arm 13 to slide in the direction of arrow B against the urging force of the spring 25 is formed. Further, the take-up arm 13 and the take-up lever 24 connected to the take-up arm 13 in the radial direction at the connecting portion 24c are always rotated clockwise by the tension of the take-up belt 14 via the main pulley 8. The engaging shaft 2 of the winding lever 24 is biased.
The position is regulated in the clockwise direction by bringing 4b into contact with the radial cam portion 7i of the cam gear 7. Reference numeral 26 is a printed circuit board, and a photo sensor 27 is provided on the printed circuit board 26 and a reflection paper 28 is held by the fast-forwarding relay gear 16.
It is located at a position facing. As shown in FIG. 7, the reflection paper 28 reflects the light emitted from the light emitting portion 27a of the photosensor 27 and reflects it when it receives the light, and sends it back to the light receiving portion 27b of the photosensor 27. The reflection part 28b and the reflection part 28b are formed in a radial pattern with equal division. The rotation speed of the fast-forwarding relay gear 16 is detected by detecting the interval at which the light emitted from the light emitting portion 27a of the photo sensor 27 is reflected by the reflecting portion 28a of the reflecting paper 28 and sent back to the light receiving portion 27b of the photo sensor 27. It is possible to detect the number of rotations of the forward rotation reel stand 17 and the reverse reel stand 18 which are always connected to the fast-forwarding relay gear 16. That is, the winding position of the cassette tape can be detected by detecting the number of rotations of the forward rotation reel stand 17 and the reverse reel stand 18 when the cassette tape is driven and calculating the difference in the number of rotations. Since the method for detecting the winding position of the cassette tape is well known, its explanation is omitted in this embodiment. 8 to 11 are partial side views showing the connected state of each gear portion, and FIGS. 8 to 9 show the gear portion 8b of the main pulley 8, the gear portion 9c of the winding gear 9, the winding relay gear 15, and the fast-forwarding. The connection state of the relay gear 16 is shown.
The winding arm 13 moves in the direction of arrow A, and the main pulley 8
FIG. 8 shows a state in which the gear portion 8b and the fast-forward relay gear 16 are in the meshable position in the thrust direction, and the gear portion 9c of the winding gear 9 and the winding relay gear 15 are in the meshable position in the thrust direction. The winding arm 13 moves in the direction of arrow B, and the gear portion 8b of the main pulley 8 and the fast-forwarding relay gear 16
The take-up gear 9 at the position where it cannot mesh in the thrust direction.
FIG. 9 shows a state in which the gear portion 9c and the take-up relay gear 15 are in the meshable position in the thrust direction. FIG.
11 to 11 show the connected state of the gear portion 8b of the main pulley 8, the gear portion 9c of the winding gear 9, the winding gear portion 18a of the reversing reel stand 18, and the fast-forward gear portion 18b. The winding arm 13 moves in the direction of arrow A, and the gear portion 8 of the main pulley 8 is moved.
b and the rapid feed gear part 18b of the reversing reel stand 18 are in a position where they can mesh with each other in the thrust direction, and the gear part 9c of the winding gear 9 is provided.
10 shows a state in which the take-up gear portion 18a of the reverse reel stand 18 and the take-up gear portion 18a cannot mesh with each other in the thrust direction, the take-up arm 13 moves in the direction of the arrow B, and the gear portion 8b of the main pulley 8 and the reverse reel do not move. The state in which the fast-forward gear portion 18b of the table 18 is in a position where meshing in the thrust direction is impossible and the gear portion 9c of the winding gear 9 and the winding gear portion 18a of the reversing reel table 18 are in a position where they can mesh in the thrust direction are illustrated. 11 shows.

The operation of the reel base switching mechanism of the tape recorder of the present invention constructed as described above will be described below. When the motor 2 is energized in the mechanism stopped state of FIGS. 1 and 2, a rotational force is generated in the counterclockwise direction, and the normal rotation flywheel 4 rotates in the counterclockwise direction due to the configuration of each rotary system component shown in FIG. At this time, the cam gear 7 engages with the engagement shaft 22b of the trigger lever 22 at the engagement portion 7e, and the toothless portion 7b is restricted to the position facing the gear portion 4b of the forward rotation flywheel 4. The rotational force of the forward rotation flywheel 4 is not transmitted to the cam gear 7. Further, the gear portion 8b of the main pulley 8 and the fast-forward relay gear 16
The fast-forward gear portion 18b of the reversing reel base 18 is in a meshable position in the thrust direction shown in FIGS. 8 and 10, but in a non-meshable position in the radial direction, the gear portion 9c of the winding gear 9 and the winding relay gear. 15 and the take-up gear portion 18a of the reversing reel stand 18 are in the thrust direction,
The rotational force of the forward rotation flywheel 4 is not transmitted to the forward rotation reel base 17 or the reverse reel base 18 because the gears are in a position where they cannot mesh in the radial direction. When the solenoid 21 is energized from this state, the engagement portion 7e of the cam gear 7 and the trigger lever 2 are in the suction completed state of the solenoid 21.
Since the engagement of the second locking shaft 22b is released, the cam gear 7 which is urged clockwise by an urging means (not shown) such as a spring is turned clockwise, and the cam gear 7 is rotated. The gear portion 7a meshes with the gear portion 4b of the forward rotation flywheel 4, the counterclockwise rotational force of the forward rotation flywheel 4 is transmitted, and the cam gear 7 starts rotating clockwise. When the cam gear 7 rotates clockwise by a certain angle, the solenoid 2
By issuing a selection command of suction or release of No. 1, the engagement position of the engagement shaft 24b of the winding lever 24 and the radial cam portion 7i of the cam gear 7 is selected. The release command causes the tension of the take-up belt 14 to rotate the take-up lever 24 in the clockwise direction, and if the connection command is in the reverse direction, the suction command of the solenoid 21 continuously holds the position of the take-up lever 24. Therefore, the take-up arm 13 connected by the connecting portion 24c of the take-up lever 24 is also rotated clockwise if the connection command is in the forward rotation direction, and the position is continued if the connection command is in the reverse direction. Retained. At the same time, the engaging portion 13d of the winding arm 13 comes into contact with the inclined portion 7k of the thrust cam portion 7j of the cam gear 7,
Since the winding arm 13 is not connected to the winding lever 24 in the thrust direction, the spring 25 shown in FIG.
Continuing to slide in the direction of arrow B against the urging force of. Further, the forward / reverse direction switching (switching means not shown) of the magnetic head (not shown) and the tape running means (not shown) is performed during the operation transition of these drive parts. When the cam gear 7 further rotates in the clockwise direction, the engaging portion 1 of the winding arm 13
3d is held by the holding portion 7l of the thrust cam portion 7j of the cam gear 7, and the gear portion 9c of the winding gear 9 and the winding relay gear 15
The take-up gear portion 18a of the reversing reel base 18 and the gear portion 8b of the main pulley 8 and the fast-forwarding relay gear 16 and the reversing reel base 18 are in a position where they can mesh with each other in the thrust direction.
The fast-forward gear portion 18b is in the non-meshable position in the thrust direction. At the same time, if the engagement shaft 24b of the winding lever 24 is along the radial cam portion 7m of the cam gear 7 if the connection command is in the forward direction, the winding lever 24 further rotates in the clockwise direction and the winding lever 24 moves in the clockwise direction. When rotated in the direction, the winding arm 13 connected in the radial direction by the connecting portion 24c of the winding lever 24 also rotates in the clockwise direction, and the engagement shaft 24b of the winding lever 24 is an inclined portion of the radial cam portion 7m. It is held, and the gear portion 9c of the winding gear 9 and the winding relay gear 15 are held.
Are engaged with each other in the radial direction, and the mechanism normal rotation recording / reproducing operation state shown in FIG. In this case, the counterclockwise rotation force of the forward rotation flywheel 4 is transmitted to the main pulley 8 via the winding belt 14 as the counterclockwise rotation force. As shown in FIG. 3, a predetermined rotational torque is generated in the take-up gear 9 by the frictional force determined by the friction coefficient between the felt 12, the main pulley 8 and the friction plate 11 and the load of the friction spring 10, and the rotation thereof is performed. The forward rotation reel base 17 is driven counterclockwise by the torque via the winding relay gear 15. If the engagement shaft 24b of the take-up lever 24 is a connection command in the reverse direction, the take-up lever 24 rotates in the counterclockwise direction and the take-up lever 24 rotates in the counterclockwise direction because it follows the radial cam portion 7n of the cam gear 7. When rotated in the direction, the winding arm 13 connected in the radial direction by the connecting portion 24c of the winding lever 24 also rotates in the counterclockwise direction,
The engaging shaft 24b of the take-up lever 24 is held by the inclined portion of the radial cam portion 7n, and the gear portion 9c of the take-up gear 9 and the take-up gear portion 18a of the reversing reel stand 18 mesh with each other in the radial direction. The mechanism inversion recording / playback operation shown is activated. At this time, the rotational force is transmitted to the reversing reel base 18 in the same manner as in the normal recording / reproducing operation state. The counterclockwise rotational force of the normal flywheel 4 is applied to the main pulley 8 via the winding belt 14 in the counterclockwise direction. 3 is transmitted as a rotational force in a predetermined direction, and as shown in FIG. 3, a predetermined force is applied to the winding gear 9 by the frictional force determined by the friction coefficient between the felt 12, the main pulley 8 and the friction plate 11 and the load of the friction spring 10. A rotation torque is generated, and the rotation torque drives the reverse reel base 18 in the clockwise direction.
FIG. 14 is a partial side view of the mechanism in the normal rotation and reverse recording / reproducing operation states. 12 to 14, the forward rotation flywheel 4 is rotating counterclockwise, but the cam gear 7 has the trigger lever 22 at the locking portion 7f.
Since the toothless portion 7c of the forward rotation flywheel 4 is engaged with the locking shaft 22b of the normal rotation flywheel 4 and is restricted to the position facing the gear portion 4b of the forward rotation flywheel 4, the rotational force of the forward rotation flywheel 4 is not transmitted to the cam gear 7. . In addition, in order to connect and hold each gear in the thrust direction, the engaging portion 13d of the winding arm 13 is connected to the cam gear 7.
By holding the thrust cam portion 7j by the holding portion 7l, the gear cams in the radial direction can be connected and held by the thrust cam portion 7m of the cam gear 7 when the engagement shaft 24b of the winding lever 24 is in the normal recording / playback operation state. In the reverse recording / reproducing operation state, the thrust cam portion 7n of the cam gear 7 holds it. At this time, the rotation speed of the motor 2 is switched by supplying a constant voltage to the power supply terminal 2c on the external circuit input section 2b of the motor 2 and connecting the external circuit to the rotation speed switching terminal 2d as shown in FIG. Is going.
Reference numeral 29 is a resistance, and 30 is a switch. As shown in FIG. 15, the resistance value applied to the rotation speed switching terminal 2d is changed by opening / closing the switch 30, and the change in the resistance value is stored in the motor 2. The number of rotations of the motor is switched stepwise by detection by a rotation speed control circuit (not shown) provided. In this embodiment, when the switch 30 is closed, the cassette tape is switched to a constant rotation speed at a constant speed for traveling at a specified speed, and when the switch 30 is opened, the rotation speed is switched to a constant rotation speed set at a high speed. Is set. That is, in the mechanism recording / playback operation state shown in FIGS. 12 to 14, the switch 30 is closed and the motor rotation speed is set to a constant rotation speed at a constant speed to perform a normal recording / playback operation, and the switch 30 is opened. By setting the motor rotation speed to a constant rotation speed set at a high speed in this state, it is possible to switch the rotation speeds of the forward rotation reel stand 17 and the reverse reel stand 18 to high speed rotation, and to perform a so-called high-speed dubbing operation. .

Next, when the solenoid 21 is energized from this state, the movable iron core 21a of the solenoid 21 starts the suction operation in the direction of arrow C, and the trigger lever 22 connected to the movable iron core 21a is opposed to the urging force of the spring 23. Rotate counterclockwise. Since the engagement portion 7f of the cam gear 7 and the engagement shaft 22b of the trigger lever 22 are disengaged in the state where the solenoid 21 has completed the suction, it is rotated clockwise by an urging means (not shown) such as a spring. The biased cam gear 7 rotates clockwise, and the gear portion 7a of the cam gear 7 is rotated.
Meshes with the gear portion 4b of the forward rotation flywheel 4, the counterclockwise rotational force of the forward rotation flywheel 4 is transmitted, and the cam gear 7 starts rotating clockwise. When the cam gear 7 rotates clockwise, the position of the engagement shaft 24b of the take-up lever 24 is regulated by the radial cam portion 7o. Therefore, the gear portion 8b of the main pulley 8, the fast-forward relay gear 16 and the fast-forward gear portion 18b of the reversing reel stand 18 are provided. 9 and 11
The gear portion 9c of the take-up gear 9 and the take-up relay gear 15 are in a position where they cannot mesh in both the thrust direction and the radial direction as shown in FIG.
The take-up gear portion 18a of the reversing reel stand 18 is in a meshable position in the thrust direction but in a non-meshable position in the radial direction. Therefore, the rotational force of the forward rotation flywheel 4 is the forward rotation reel table 17 or the reversing reel. It is not transmitted to the table 18. Then cam gear 7
By issuing a selection command for attracting or releasing the solenoid 21 in a state in which is rotated clockwise by a certain angle, the engagement position of the engagement shaft 24b of the winding lever 24 and the radial cam portion 7o of the cam gear 7 is selected, and the normal position is selected. If it is a connection command in the rolling direction, the take-up belt 14
The take-up lever 24 is rotated in the clockwise direction by the tension of, and if the connection command is in the reverse direction, the suction command of the solenoid 21 keeps the position of the take-up lever 24 continuously. Therefore, the take-up arm 13 connected by the connecting portion 24c of the take-up lever 24 is also rotated clockwise if the connection command is in the forward rotation direction, and the position is continued if the connection command is in the reverse direction. Retained. At the same time, since the engaging portion 13d of the winding arm 13 extends along the inclined portion 7p of the thrust cam portion 7j of the cam gear 7, the winding arm 13 slides in the direction of arrow A by the biasing force of the spring 25, and the winding arm 13 rotates. Boss end face 13
The position e in the arrow A direction is regulated by the contact of e with the seat surface 1m of the support shaft 1b on the mechanical chassis 1. The position of the winding arm 13 in the thrust direction at this time is shown in FIG.
8 and the gear portion 8b of the main pulley 8, the fast-forward relay gear 16, and the fast-forward gear portion 1 of the reversing reel stand 18 shown in FIG.
8b is in a position where meshing is possible in the thrust direction, and the gear portion 9c of the winding gear 9, the winding relay gear 15, and the winding gear portion 18a of the reversing reel stand 18 are in a position where meshing is not possible in the thrust direction. . At the same time, if the engaging shaft 24b of the winding lever 24 is a connection command in the forward rotation direction, the cam gear 7
Since the winding lever 24 further rotates in the clockwise direction because it follows the radial cam portion 7q, when the winding lever 24 rotates in the clockwise direction, the winding portion 24c of the winding lever 24 connects in the radial direction. The arm 13 also rotates clockwise, and the engagement shaft 24b of the take-up lever 24 is fixed to the radial cam portion 7.
The gear portion 8b of the main pulley 8 and the fast-forward relay gear 16 are held in the inclined portion of q and are brought into mesh with each other in the radial direction, and the mechanism fast-forward operation state shown in FIG. 16 is obtained. In this case, the counterclockwise rotation force of the forward rotation flywheel 4 is transmitted to the main pulley 8 via the winding belt 14 as the counterclockwise rotation force. The forward rotation reel base 17 is driven counterclockwise by the connection between the gear portion 8b of the main pulley 8 and the fast-forward relay gear 16. Also, the engaging shaft 24 of the take-up lever 24
If b is a connection command in the reverse direction, it follows the radial cam portion 7r of the cam gear 7, so the winding lever 24 rotates counterclockwise, and when the winding lever 24 rotates counterclockwise, the winding lever 24 rotates. The take-up arm 13 connected in the radial direction by the connecting portion 24c also rotates counterclockwise, the engagement shaft 24b of the take-up lever 24 is held by the inclined portion of the radial cam portion 7r, and the gear of the main pulley 8 is held. The portion 8b and the fast-forward gear portion 18b of the reversing reel base 18 mesh with each other in the radial direction, and the mechanism rewinding operation state shown in FIG. 17 is obtained. At this time, the rotational force is transmitted to the reversing reel base 18 in the same manner as in the fast-forward operation state, because the rotational force in the counterclockwise direction of the forward rotation flywheel 4 is transmitted to the main pulley 8 in the counterclockwise direction via the winding belt 14. Transmitted as rotational force,
By connecting the gear portion 8b of the main pulley 8 and the fast-forward gear portion 18b of the reverse reel base 18, the reverse reel base 18 is driven in the clockwise direction. FIG. 18 shows a partial side view of the mechanism in the fast forward and rewind operation states. FIG.
In FIG. 18, the forward rotation flywheel 4 is rotating in the counterclockwise direction, but the cam gear 7 engages with the engagement shaft 22b of the trigger lever 22 at the engagement portion 7g, and the toothless portion 7d thereof rotates in the forward rotation direction. Since the flywheel 4 is restricted to a position facing the gear portion 4b, the rotational force of the forward flywheel 4 is not transmitted to the cam gear 7. Further, in order to connect and hold each gear in the thrust direction, the rotation boss end surface 13e of the winding arm 13 is seated on the mechanical chassis 1 by the bearing surface 1m of the support shaft 1b.
When the engagement shaft 24b of the take-up lever 24 is in the fast-forward operation state, the thrust cam portion 7q of the cam gear 7 is held in the radial direction by connecting and holding each gear in the radial direction. In the rewinding operation state, the thrust cam portion 7r of the cam gear 7 holds it. In addition, the motor 2 at this time
Similarly to the mechanism recording / reproducing operation state, the rotation speed control of the motor is performed by supplying a constant voltage to the power supply terminal 2c on the external circuit input section 2b of the motor 2 to rotate the rotation speed switching terminal 2 as shown in FIG.
This is done by connecting an external circuit to d. In this embodiment, when the switch 30 is closed, the cassette tape is run at a constant speed at a constant speed, and when the switch 30 is open, It is set so as to switch to the constant rotation speed set at high speed. That is, in the mechanism fast-forward and rewind operation states shown in FIGS. 16 to 18, the switch 30 is closed and the motor rotation speed is set to a constant rotation speed at a constant speed to perform normal fast-forward and rewind operations. By opening the switch 30 and setting the motor rotation speed to a constant rotation speed set at high speed, the rotation speeds of the forward rotation reel stand 17 and the reverse reel stand 18 are switched at high speed, and so-called high-speed FF / REW operation is performed. It is possible. The switching of the motor rotation speed is performed by switching the light emitted from the light emitting portion 27a of the photo sensor 27 to the reflection paper 2 as described above.
The rotation number of the fast-forward relay gear 16 is detected by detecting the interval at which the light is reflected by the reflecting portion 28a of 8 and sent back to the light-receiving portion 27b of the photo sensor 27, and the forward rotation reel stand 17 that is always connected to the fast-forward relay gear 16 is detected. And the number of rotations of the reverse reel stand 18 are detected to drive the forward reel stand 17 when the cassette tape is driven.
Is calculated by calculating the difference in the number of revolutions of the reversing reel base 18 and the operation for detecting the winding position of the cassette tape. That is, when the cassette tape is driven, fast-forwarding and rewinding operations are performed for a certain period of time at a constant rotation speed at a constant speed, and after detecting the winding position of the cassette tape, if the cassette tape remaining amount is sufficient, The speed is switched to a constant number of rotations, and the normal rotation reel base 17 and the reverse reel base 18 are driven at a high rotation speed, and a constant rotation speed at a high speed is set immediately before the end of the cassette tape or when a mechanism stop command is issued. It is set to switch to a fixed speed at high speed. For this reason, disengagement of mechanism components, jumping of gears, breakage of cassette tape, damage, etc. are prevented by fast-forwarding during high-speed rotation, rushing into the end of the cassette tape in the rewinding operation state, and brake mechanism operation at the time of a mechanism stop command. It becomes possible.

In the external circuit configuration for switching the rotation speed of the motor 2 shown in FIG. 15 in this embodiment, only the two-step switching between the constant speed rotation speed and the high speed rotation speed is performed, but as shown in FIG. If it is composed of (N + 1) resistors 29 and N switches 30, it is possible to realize N stages of constant rotation speed switching by sequentially opening and closing the switches 30.

[0017]

The tape recorder of the present invention is a mechanism constructed as described above, and is equipped with an electronic governor circuit used for realizing the high-speed dubbing function of the conventional tape recorder mechanism and is rotated stepwise. The motor that can switch the number of revolutions is configured not only to change the number of revolutions in the recording / playback operation state, but also to change the number of revolutions in the fast-forward and rewind operation states. It is not necessary to add a high-priced motor, and the motor of the present invention is of a type that is controlled to a constant rotation speed as long as the motor supply voltage is within a fixed range, for switching between the constant rotation speed and the high speed rotation. Since it is a motor and the rotation speed switching electric circuit has a simple configuration that only changes the resistance value, the conventional motor supply voltage is proportional to the motor rotation speed. The voltage fluctuates under the influence of variations in the component accuracy of the voltage control circuit and temperature changes as in the case of a motor of the type, and it is difficult to control the motor at a constant number of revolutions, which makes the cassette tape fast-forwarding and rewinding time unstable. No problems occur, fast-forwarding at high speed,
It is possible to prevent disengagement of mechanism components, jumping of gears, breakage of cassette tape, damage, etc. by rushing into the end of the cassette tape in the rewinding operation state or operating the brake mechanism when a mechanism stop command is issued. , High reliability, low cost and high speed FF of tape recorder mechanism
/ REW function can be realized.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of each drive system component in a state in which the mechanism of a tape recorder according to an embodiment of the present invention is stopped.

FIG. 2 is a side view of the same portion.

FIG. 3 is a side view of a main pulley portion showing the configuration of each rotary system component of the tape recorder in one embodiment of the present invention.

FIG. 4 is a side view of the main pulley and a normal rotation flywheel.

FIG. 5 is a partial side view of the normal rotation reel stand side.

FIG. 6 is a partial side view of the reverse reel stand side.

FIG. 7 is a plan view showing a reflective paper of a tape recorder according to an embodiment of the present invention.

FIG. 8 is a partial side view of a tape recorder according to an embodiment of the present invention, showing each rotary system component configuration when a fast-forwarding relay gear is connected.

FIG. 9 is a partial side view when the take-up relay gear is connected.

FIG. 10 is a partial side view when the fast-forward gear is connected.

FIG. 11 is a partial side view when the winding gear is connected.

FIG. 12 is a plan view showing the structure of each drive system component in the normal recording / reproducing operation state of the mechanism of the tape recorder in one embodiment of the present invention.

FIG. 13 is a plan view showing each drive system component configuration in the mechanism reverse recording / reproducing operation state.

FIG. 14 is a partial side view showing the configuration of each drive system component in the normal rotation and reverse recording / reproducing operation state of the mechanism.

FIG. 15 is a circuit diagram showing the configuration of an external circuit for switching the rotation speed of the motor of the tape recorder in one embodiment of the present invention.

FIG. 16 is a plan view showing the configuration of each drive system component in the mechanism fast-forwarding operation state of the tape recorder in one embodiment of the present invention.

FIG. 17 is a plan view showing each drive system component configuration in the mechanism rewinding operation state.

FIG. 18 is a partial side view showing each drive system component configuration in the same mechanism fast-forward and rewind operation states.

FIG. 19 is a circuit diagram showing an external circuit configuration for switching the rotation speed of the motor of the tape recorder in one embodiment of the present invention.

[Explanation of symbols]

 2 Motor 2a Rotation shaft 2d Rotation number switching terminal 3 Motor pulley 4 Forward rotation flywheel 4a Forward rotation capstan 4b Gear part 4c V groove part 5 Reverse flywheel 5a Reverse capstan 6 Capstan belt 7 Cam gear 8 Main pulley 8a V groove part 8b Gear Part 9 Take-up gear 13 Take-up arm 13d Engagement part 14 Take-up belt 15 Take-up relay gear 16 Fast-forward relay gear 17 Forward reel stand 17a Take-up gear part 17b Fast-forward gear part 18 Reverse reel stand 18a Take-up gear part 18b Rapid feed gear part 21 Solenoid 21a Movable iron core 22 Trigger lever 22a Connecting part 22b Locking shaft 23 Spring 24 Winding lever 24b Engaging shaft 24c Connecting part 25 Spring 26 Printed circuit board 27 Photo sensor 28 Reflective paper

Claims (2)

[Claims] 1. A tape recorder mechanism equipped with an electronic governor circuit and a motor capable of gradually changing the number of revolutions, wherein the driving force of the motor is configured on a forward rotation and a reverse reel stand for winding a cassette tape. Forward rotation recording / reverse recording / reverse recording / reproduction, fast forward / rewinding mechanism is configured to realize each operation mode state by transmitting through components, and it is possible to switch the rotation speed of the motor in the fast forward / rewinding operation state. Characteristic tape recorder. 2. A detection means for detecting the number of rotations of the forward rotation and reverse rotation reel bases is provided, and the detection means detects the winding position of the cassette tape, and immediately before the end of the cassette tape in the fast forward and rewind operation states. A tape recorder characterized by switching the rotation speed of the motor.