JPS6315643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses the rotational force of one motor and the force of another motor or electro-mechanical converter to perform the vertical movement and rotational movement of a tone arm equipped with a cartridge at its tip. This relates to a tone arm drive device for a record player configured as follows,
The purpose of this is to effectively utilize the rotational force of two motors or the force of one motor and an electromechanical converter to create a mechanism for the lifting and lowering movement and rotational movement of the tone arm that is simple and reliable. It consists in configuring it so that it will be carried out.

In general, a tone arm drive device provides an appropriate rotation position to a select lever in order to select the lowering position of the cartridge provided at the tip of the tone arm onto the record disc, and this serves as a stopper to select the rotation angle of the tone arm. This was done by regulating the However, this method requires an electro-mechanical converter to determine the rotational position of the select lever, and the mechanical vibrations of the electro-mechanical converter itself have a considerable effect on the vertical movement and rotational movement of the tone arm. It is difficult to expect reliable movement of the tone arm, and there is also a lot of play in the mechanism, making the mechanism itself complicated. Also,
It is known that one way to avoid the effects of mechanical vibrations on the electromechanical converter is to use separate motors to move the tone arm up and down and turn it, but in this method both reversible motors are used. The drawbacks were that it was necessary and expensive.

The present invention eliminates the drawbacks of such conventional devices, and the present invention will be described below with reference to drawings of embodiments.

1 and 2 show an embodiment of the arm drive device of the present invention. In the figures, 1 is a tone arm equipped with a cartridge (not shown) at the tip, and the tone arm is mounted on a horizontal arm swivel base 2. It is rotatably supported in the vertical direction by a shaft 3, and rotatably supported in the horizontal direction by a vertical shaft 4 provided on the arm swivel base 2. Reference numeral 5 denotes an elevating shaft having an elevating plate 6 for elevating and lowering the tone arm 1, and is supported by a panel 7 of the record player so as to be vertically movable. The arm swivel base 2 is rotatably supported on the panel 7.

8 is a chassis structure provided opposite to the panel 7, and a first motor 9 is attached to the back surface of the chassis structure. Further, the chassis structure 8 is provided with a bearing 10, and a rotary shaft 13 is rotatably supported by the bearing 10. A pulley 11 is attached to the lower end of the rotating shaft 13,
A prime mover 12 is attached to its upper end. A belt 15 is suspended between a pulley 14 provided on the main shaft 9a of the first motor 9 and a pulley 11 of the rotating shaft 13, and the rotational force is transmitted through the belt 15 and the rotating shaft 13. The above motor vehicle 1
2.

Reference numeral 16 denotes a second motor attached to the chassis structure 8, and a feed screw 17 is provided on its main shaft 16a. Further, a support shaft 18 is provided on the back surface of the chassis structure 8, and the support shaft 18
is a helical gear 19 that meshes with the feed screw 17.
is rotatably supported. A timing cam 20 and a starting cam 21 are also pivotally supported on the support shaft 18 so as to rotate synchronously with the helical gear 19, and are turned on and off alternately in opposition to the timing cam 20. First and second limit switches 22 and 23 are disposed at. The rotational force of the second motor 16 is transmitted to the helical gear 19 via the feed screw 17,
The timing cam 20 and the starting cam 21 are rotated, and the first and second limit switches 2 are rotated.
2 and 23 are turned on and off alternately. Reference numeral 24 designates an activation lever located on the surface side of the chassis structure 8 and rotatably supported on the rotation shaft 13. An engagement pin 25 is provided at one end of the activation lever. The starting cam 21 passes through the through hole 26 provided in the chassis structure 8.
is opposed to. Further, a support shaft 27 is provided at the other end of the activation lever 24.
Reference numeral 7 denotes a hook pin 29 provided on the back surface of the chassis structure 8 and protruding through a through hole 28 provided in the chassis structure 8 to the back surface side of the chassis structure 8.
A spring 30 is suspended between. Therefore, the activation lever 24 is always urged in one direction by the spring 30, and the engagement pin 25 provided at one end thereof comes into elastic contact with the activation cam 21. There is.

A transmission wheel 31 is rotatably supported on a support shaft 27 provided at the other end of the activation lever 24, and is constantly in contact with the motive wheel 12 rotated by the first motor 9. An arm starting wheel 32 and a lifter starting wheel 33 are also pivotally supported on the support shaft 27 so as to rotate synchronously with the transmission wheel 31, and the starting wheel 33 swings as the starting cam 21 rotates. The lever 24 allows the transmission path of the rotational force of the first motor 9 to be switched. Reference numeral 34 denotes a lifter wheel rotatably supported on a support shaft 35 protruding from the surface side of the chassis structure 8, and is disposed so as to face the lifter starter wheel 33 pivotally supported on the other end of the starter lever 24. has been done. The lifter wheel 35 has a lifter cam surface 36 on its main surface that connects the lowest part 36a and the highest part 36b by an inclined part 36c, and on the outer periphery of the lifter cam surface 36, third and fourth limit switches 37 and 38 are turned on. It is provided with a protrusion 39 for turning off. The lifter wheel 34 has a lifter cam surface 3 provided on its main surface.
6 corresponds to the lifting shaft 5.

Reference numeral 40 denotes an arm wheel connected to the arm swivel base 2, and the arm starting wheel 32 corresponds to the rib inner surface 40a on the outer periphery of the arm wheel. Above arm car 3
9 has lead inslits 41a, 41b, 41c and a terminal slit 41 on its main surface for position detection.
d. An initial-return slit 41e is provided. 4
Reference numeral 2 denotes a position detecting sensor disposed on the rotation locus of the position detecting slit provided in the arm wheel 39, and is composed of, for example, a light emitting element and a light receiving element arranged opposite to each other so as to sandwich the arm wheel 39. There is.

Next, the operation of the arm driving device will be explained. First, when the tone arm 1 is at the stop position, that is, when the tone arm 1 is lowered to the armrest (not shown) position, the first and second motors 9 and 16 are in a stopped state as shown at point A in FIG. The first, second and third limit switches 22, 23,
37 are both in the on state, and the fourth limit switch 38 is in the off state. The starting lever 24, which is swung by the starting cam 21, is swung toward the lifter wheel 35 against the biasing force of the spring 30, as shown in FIG. The rotation transmission system is configured such that the rotational force of the prime mover 12 rotated by the first motor 9 is transmitted to the lifter wheel 35 when the starter wheel 33 is pressed against the lifter wheel 35. It is configured. Now, when the first motor 9 rotates, its rotational force is transmitted to the lifter wheel 35 via the prime mover 12, the transmission wheel 31, and the lifter starting wheel 33.
The lifter wheel 35 is rotated clockwise. When the lifter wheel 35 rotates, the third limit switch 37 is turned off, and as the lifter cam surface 36 moves clockwise, the lifting shaft 5 is raised, so that the tone arm 1
is raised at the armrest position. When the lifting shaft 5 is positioned at the highest portion 36b of the lifter cam concave surface 36 as shown in FIG. 3 by the rotation of the lifter wheel 35, the tone arm 1 is raised to the highest position at the armrest position. The fourth limit switch 38 is turned on as shown at point B in FIG.
The rotation of the first motor 9 is stopped, and the second motor 16 is rotated in one direction. 2nd above
When the motor 16 is rotated, its rotational force is transmitted to the helical gear 19 and the timing cam 20
and rotate the starting cam 21. At this time, the second limit switch 23 corresponding to the timing cam 20 is turned off, then the first limit switch 22 is turned off as shown at point C in FIG. 7, and the second limit switches 23 are turned off. The starting cam 21 is rotated synchronously until the first limit switch 22 is turned off later. When the starting cam 21 rotates, the starting lever 24, which is biased by the spring 30, is swung by the starting cam 21, as shown in FIG. The wheel 33 is separated from the lifter wheel 35, and the arm starting wheel 32 is pressed against the arm wheel 40.
When the arm starting wheel 32 is pressed by the arm wheel 39, that is, when the first limit switch 22 is turned off, the rotation of the second motor 16 is stopped and the first motor 9 is reversely rotated. 1st
The rotational force of the motor 9 is generated by the driving wheel 12, the transmission wheel 31,
The signal is transmitted to the arm wheel 40 via the arm starting wheel 32, and the arm wheel 40 is rotated clockwise as shown in FIG. 4, thereby turning the tone arm 1. When the position detection sensor 42 detects any of the lead-in slits 41a to 41c of the arm wheel 40 that rotates synchronously with the tone arm 1, as shown at point 2 in FIG. Since the first motor 9 is stopped and the second motor 16 is rotated in one direction, the timing cam 20 and the starting cam 21 are rotated by the second motor 16, and the timing cam 20, the first limit switch 22 is turned on, and then the second limit switch 23 is turned on.
is turned on. The first limit switch 22
is turned on, and then the second limit switch 2 is turned on.
3 is turned on, the activation lever 24 is swung by the activation cam 21, and the arm activation wheel 32 pivoted at its tip is separated from the arm wheel 40, and the lifter activation wheel 33 is activated by the lifter wheel 35.
When pressed, that is, when the second limit switch 23 is turned on, the rotation of the second motor 16 is stopped as shown at the point in FIG.
Since the motor 9 is reversed, the rotational force of the first motor 9 is transmitted to the lifter wheel 35 via the prime mover 12, the transmission wheel 31, and the lifter starting wheel 33, and the lifter wheel 35 is shown in FIG. As shown, by rotating counterclockwise, the lifting shaft 5 is lowered in response to the lifter cam surface 36 provided on the lifter wheel 35, and the cartridge at the tip of the tone arm 1 is lowered onto the record surface. At the end of the descending movement of the lifting shaft 5, the lifter wheel 35 is rotated counterclockwise to switch the third limit switch 37.
When turned on, the rotation of the first motor 9 is stopped as shown at point F in FIG. 7, and the record playing state is entered. At this time, the rotational force of the first motor 9 is applied to the arm wheel 40 and the lifter wheel 3 in order to cause the tone arm 1 to move up and down and rotate.
5, the arm starting wheel 32 and lifter starting wheel 33 are swung toward the lifter wheel 35, and no resistance is applied to the arm wheel 39. car 40
is in a free rotating state and is rotated without any effect on the record performance. The lead-in operation is completed as described above.

A cut signal applied during the record playing, or an end slit 41 provided on the arm wheel 40 at the end of the record playing.
When the first motor 9 rotates as shown at point G in FIG. 7 due to the termination signal generated when the position detection sensor 42 detects the position a, the rotational force is transferred to the drive wheel and the transmission wheel. 31 and lifter starting vehicle 33
is transmitted to the lifter wheel 35, and the lifter wheel 35 is rotated clockwise. When the lifter wheel 35 rotates, the third limit switch 37
is turned off, and as the lifter cam surface 36 moves clockwise, the elevating shaft 5 is raised, so that the tone arm 1 is raised at the end position of record playing. When the lifting shaft 5 is positioned at the highest part 36b of the lifter cam concave surface 36 as shown in FIG. 6 by the rotation of the lifter wheel 35, the tone arm 1 rises to the highest position at the end position of the record playing. 7, the fourth limit switch 38 is turned on, and the rotation of the first motor 9 is stopped and the rotation of the second motor 1 is turned on.
6 is rotated in one direction. The second motor 16
When rotated, the rotational force is transmitted to the helical gear 19 to rotate the timing cam 20 and the starting cam 21. At this time, the second limit switch 23 corresponding to the timing cam 20 is turned off, then the first limit switch 22 is turned off as shown at point R in FIG. 7, and the second limit switches 23 are turned off. The starting cam 21 is periodically rotated until the first limit switch 22 is turned off. and,
When the starting cam 21 rotates, the starting lever 24 is biased by the spring 30 as shown in FIG.
is swung by the starting cam 21, and the lifter starting wheel 33, which is pivotally supported at its tip, is separated from the lifter wheel 35, and the arm starting wheel 32 is pressed against the arm wheel 40. Above arm starting car 3
2 is pressed by the arm wheel 40, that is, when the first limit switch 22 is turned off, the rotation of the second motor 16 is stopped and the first motor 9 is rotated. The rotational force is transmitted to the arm wheel 40 via the prime mover 12, transmission wheel 31, and arm starting wheel 32,
0 counterclockwise as shown in FIG. 4 to swing the tone arm 1 toward the armrest. A rest slit 41 of the arm wheel 40 that rotates synchronously with the tone arm 1 while it is turning.
When the position detection sensor 42 detects e, the first motor 9 is stopped and the second motor 16 is rotated in one direction, as shown by the point N in FIG. The timing cam 20 and the starting cam 21 are rotated by the motor 16, and in response to the timing cam 20, the first limit switch 22 is turned on, and then the second limit switch 22 is turned on.
The limit switch 23 is turned on. 1st above
During the period in which the second limit switch 23 is turned on after the limit switch 22 is turned on, the activation lever 24 is swung by the activation cam 21, and the arm activation wheel 32, which is pivotally supported at the tip thereof, is rotated. 40 and press the lifter starting wheel 33 against the lifter wheel 35. When the lifter starting wheel 33 is pressed by the lifter wheel 35, that is, when the second limit switch 23 is turned on, the rotation of the second motor 16 is stopped as shown at point R in FIG. Since the first motor 9 is reversely rotated, the rotational force of the first motor 9 is transmitted to the lifter wheel 35 via the prime mover 12, the transmission wheel 31, and the lifter starting wheel 33, and the lifter wheel 35 is As shown in the figure, by rotating counterclockwise, the lifting shaft 5 is lowered in response to a lifter cam surface 36 provided on the lifter wheel 35, and the tone arm 1 is lowered onto the arm rest. When the third limit switch 37 is turned on by the counterclockwise rotation of the lifter wheel 35 at the end of the descending movement of the lifting shaft 5, the first motor 9
The rotation of the tone arm 1 is stopped, and the return movement of the tone arm 1 is completed. At this time, an arm starting wheel 32 and a lifter starting wheel 33 are used to transmit the rotational force of the first motor 9 to the arm wheel 40 and the lifter wheel 35 in order to cause the tone arm 1 to move up and down and rotate. , the lifter starting wheel 33 is swung toward the lifter wheel 35, and the arm wheel 40 is swung toward the lifter wheel 35.
Since no resistance is applied to the tone arm 1, the arm wheel 40 is in a free rotating state.
is rotated without any effect on the return operation of the The return operation is completed in the above manner.

In the above embodiment, the motor 16, the timing cam 20, and the starting cam 2 are used in order for the motive wheel 12 to switch and transmit the rotational force to the arm wheel 40 and the lifter wheel 34.
1 was used, but in addition to this, arm activation vehicle 32,
The lifter starting car 33 is connected to the arm car 40 and the lifter car 34
A plunger may be used as an electro-mechanical converter to be in contact with the actuating lever 24, and the actuating lever 24 may be directly driven by this plunger.

As described above, according to the present invention, a lifter wheel having a cam surface for raising and lowering the tone arm and an arm wheel for rotating the tone arm are connected by the rotational force of one motor. A reversible motor that can control forward rotation, reverse rotation, and stop can be used. Using this, the tone arm can be raised, lowered, and rotated automatically and continuously. Further, since the lifter car and the arm car are coaxially provided, the configuration is simple, the assembly accuracy is improved, and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the arm driving device of the present invention, FIG. 2 is a plan view thereof, and FIGS.
The figure is a plan view for explaining the operation of the device.
The figure is a timing chart for explaining the operation of the device. 1...Tone arm, 4...Arm swivel base, 5
... Lifting shaft, 9, 16 ... Motor, 12 ... Driving wheel, 19 ... Helical gear, 20 ... Timing cam, 21 ... Starting cam, 22, 23, 37, 38
... Limit switch, 24 ... Start lever, 2
5... Engagement pin, 30... Tension spring, 31...
Transmission wheel, 32... Arm starting car, 33... Lifter starting car, 34... Lifter car, 36... Cam surface, 4
0... Arm car.

Claims (1)

[Scope of Claims] 1. A lifter wheel having a cam surface provided opposite to a lifting shaft for raising and lowering the tone arm, and an arm swivel table provided coaxially with the lifter wheel and supporting the tone arm in a rotatable manner. an arm wheel coupled to the lifter wheel, a starting wheel means disposed between opposing portions of the lifter wheel and the arm wheel and changing the contact position thereof by swinging of the starting lever, and reversibly rotationally driving the starting wheel means. a driving means for urging the starting wheel means to elastically press the arm wheel; and a driving means for urging the starting wheel means to elastically press the arm wheel; swinging means for swinging the starting lever by selectively switching between contacting and pressing the starting lever and contacting and pressing the starting wheel means against the lifter wheel against the urging force of the elastic urging means; The lifter wheel receives the driving force of the driving means through the starting wheel means which is brought into contact with and pressed against the lifter wheel by the swinging means and the starting lever, and causes the tone arm to move up and down; The arm wheel receives the driving force of the driving means through the starting wheel means which is pressed against the arm wheel by the swinging means and the starting lever, so that the tone arm performs a reversible turning movement. An arm drive device for a record player, characterized in that it is configured as follows. 2. The arm wheel is arranged concentrically with respect to the lifter wheel, and is configured so that the starting wheel means, which is pressed against the outer periphery of the lifter wheel, is pressed against the inner surface of an arcuate rib provided on the outer periphery of the arm wheel. An arm drive device for a record player according to claim 1, characterized in that: 3. The starter wheel means includes a transmission wheel that is always in contact with the prime mover to which the rotational force of the drive means is transmitted, and a transmission wheel that is located on one side of the transmission wheel and faces the inner surface of an arcuate rib around the outer periphery of the arm wheel. and a lifter starter wheel, which is located on the other side of the transmission wheel and faces the outer peripheral surface of the lifter wheel, and is rotatable synchronously with one end of the starter lever constituting the switching means. An arm drive device for a record player according to claim 1, characterized in that the arm drive device is pivotally supported as follows. 4. The starting lever is provided with a starting wheel means at one end and rotatably supported in the center thereof, and the swinging means is constituted by a starting cam with opposing engagement pins provided at the other end of the starting lever. A timing cam that is rotatably supported in synchronization with the starting cam, and first and second timing cams that are arranged opposite to the timing cam.
a limit switch, a gear rotatably supported to rotate synchronously with the starting cam and the timing cam, and a motor for rotationally driving the gear in one direction; 2. The arm drive device for a record player according to claim 1, wherein the rotation period of the motor is controlled by a limit switch to change the position of the starting wheel means. 5. The starting lever is provided with a starting wheel means at one end and rotatably supported in the center thereof, and the swinging means is constituted by a plunger connected to the other end of the starting lever, and the swinging means is configured to turn the plunger on and off. 2. The arm drive device for a record player according to claim 1, wherein the arm drive device for a record player is configured to switch the position of the starter wheel means. 6. Claims characterized in that the lifter car is provided with two limit switches corresponding to each other for determining the raised position and the lowered position of the tone arm lifting shaft facing the cam surface provided on the lifter car. The arm drive device for a record player according to item 1.