JPS6220602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a record player system including:
In particular, it relates to a device capable of continuous start and restart operations.

As is well known, a fully automatic record player system is constructed so that lead-in, return, down, and up of the tone arm can be controlled by an operation switch.

By the way, when using this type of record player system, for example, if you forget to place a record on the turntable and perform the start operation, and then immediately after the tone arm starts the lead-in operation, you forget to place the record. I noticed,
I often find myself performing a redirect operation in a hurry.

However, in many conventional record player systems of this type, the tone arm driving device cannot be reset unless a series of lead-in and lead-down operations are completed. With such a structure, even if you perform the restart operation immediately after the start operation is performed as described above and the lead-in operation is started, the tone arm will complete the lead-in and down operation, and after that completion, Eventually it will be brought up and returned. However, in this case, when the tone arm is completely down, the stylus tip of the cartridge accidentally comes into contact with the turntable, causing a very serious accident in which the stylus tip etc. are severely damaged.

The present invention was invented in order to correct the above-mentioned defects.In a fully automatic record player system, when the reject operation is performed immediately after the start operation as described above, the tone arm is brought down. The aim is to provide something that can be redirected without any problems.

Embodiments of a record player system to which the present invention is applied will be described below with reference to the drawings.

First, this record player system uses a dedicated motor to drive the tone arm, and is configured so that the tone arm can be freely controlled regardless of the rotation of the turntable. In addition to the fully automatic function, this record player system also has functions such as cue play, tone arm height adjustment, muting linked to the arm lifter, and raising and lowering the tone arm using a feather touch switch. This design pursues ease of use in terms of both automatic and manual operation.

Next, the structure of this record player system will be explained.

First, in FIG. 1, a turntable 2 is arranged on a main body frame 1 constituting the upper panel of a player cabinet. The turntable 2 is configured to be rotationally driven by a turntable drive motor 4 directly connected to the lower part of the turntable shaft 3.

On the other hand, a tone arm 5 is disposed on one side of the turntable 2 on the main body frame 1. This tone arm 5 is attached to the upper end of a vertical arm rotation shaft 6 so as to be freely rotatable in the vertical direction around a horizontal rotation axis as is conventionally known. It is rotatably mounted on a fixed bearing block 7. The tone arm 5 is configured to be controlled by a tone arm drive motor 8 which rotationally drives the arm rotation shaft 6. A cartridge 10 is attached to the tip of the tone arm 5 via a head shell 9, and a counterweight is attached to the other end. Also, arm lifter 1 for raising and lowering tone arm 5.
2 is attached to the bearing block 7 portion, and an armrest 13 of the tone arm 5 is attached to the main body frame 1.

Further, the operation section provided on the main body frame 1 includes five switches SW1 to SW5 that control the lead-in, return, repeat, down, and up of the tone arm 5, and the start and stop of the turntable 2. Control switches SW6 are arranged, for example, in a line. A total of six switches SW1 to SW6 are configured as feather touch type switches. Furthermore, the start switch SW
1. Redirect switch SW2 and repeat switch SW3 are equipped with display light emitting diodes _P1 to _P3 that are lit when these are turned on, respectively.
Also down switch SW4 and up switch SW
5 is equipped with a display light emitting diode P4 that is turned on when the up switch SW5 is turned on and turned off when the down switch _SW4 is turned on, and a start/stop switch SW6 for the turntable is also equipped with a start operation. Light-emitting diode _P5 for display that turns on when the fingertip touches (first fingertip touch) and turns off when the stop operation (second fingertip touch) occurs.
is energized. Note that SW7 is a power switch, and is configured as a push-push type switch, for example. In addition, the operation section has a 17 cm,
A size select knob 14 is provided to select record sizes of 25cm and 30cm.

Next, as shown in FIG. 2, sleeves 17 are inserted into the outer periphery of the arm rotation shaft 6 so as to be coaxial with each other, and the arm rotation shaft 6 is rotatably supported at both upper and lower ends of the sleeve 17 via a pair of bearings 18. has been done. Note that the lower end of the arm rotation shaft 6 extends further downward than the lower end of the sleeve 17. The sleeve 17 is inserted from above into a vertical insertion hole 19 provided in the bearing block 7, and extends below the main body frame 1 through this. In this state, the arm rotating shaft 6 and the sleeve 17 are configured to be movable vertically relative to the bearing block 7.

By adjusting the vertical movement of the arm rotation shaft 6, the height of the tone arm 5 is adjusted. Note that a height adjustment screw 20 is screwed into a horizontal screw hole 21 provided in a part of the bearing block 7,
Its tip is pressed against the side surface of the sleeve 17, and the sleeve 17 is fixed to the bearing block 7 at a desired height. However, at this time, the tip of the height adjustment screw 20 is inserted into a keyway 22 provided on the side surface of the sleeve 17, and the sleeve 17
Rotation is prevented.

On the other hand, a tone arm drive device 25 is attached to the lower end of the arm rotation shaft 6 and the sleeve 17 to control the horizontal and vertical rotation of the tone arm 5. Therefore, when adjusting the height of the tone arm 5, the entire tone arm driving device 25 is configured to be moved up and down together with the arm rotating shaft 6 and the sleeve 17.

Next, the tone arm driving device 25 will be explained.

First, as shown in FIG. 2, a button 2 is attached to the outer periphery of the lower end of the vertically adjustable sleeve 17.
6 is inserted and fixed with screws 27. A mechanical chassis 28 is horizontally fixed to the lower end of the bush 26 by crimping or the like. On the other hand, a stepped portion 2 is provided at the upper end of the bush 26.
6a, and a control cam 29 is rotatably attached to the outer periphery of the stepped portion 26a. A lead-in lever 30 is disposed below the control cam 29, and is rotatably attached to the outer periphery of the lower end of the bush 26. Further, a drop position adjustment lever 31 of the tone arm 5 is disposed below the lead-in lever 30, and the drop position adjustment lever 31 is rotatably attached to the outer periphery of the boss 30a of the lead-in lever 30. Therefore, the control cam 29, the lead-in lever 30, and the drop position adjustment lever ₃₁ are configured to rotate around the same axis P1 of the arm rotation shaft 6. In addition, the mechanical chassis 28
A brake drum 32 is arranged below, and this brake drum 32 is fixed to the lower end of the arm rotating shaft 6 with a screw 32. A shutter plate 33 is arranged below this brake drum 32,
This shutter plate 33 is attached to the outer periphery of the boss 32a of the brake drum 32 so as to be adjustable in angle. The motor 8 is mounted under the main body frame 1 by a motor mounting plate 34, as shown in FIGS. 1 and 2.

The control cam 29 is constructed of a disc body as shown in FIGS. 3, 4, 6, and 7. The lever control cam 29 is configured to be reciprocated within an angle of approximately 130 degrees. A gear forming wall 36 is provided on a part of the circumferential surface 29a of the control cam 29 and projects downward from the circumferential surface 29a and has an arcuate shape. A gear 37 is provided on the outer periphery of the gear forming wall 36. The gear 37 is provided over an angle of 130 degrees or more, and is configured as a spur gear with a width corresponding to the amount of height adjustment of the tone arm 5. Further, an arm lifter cam 38 is provided on a portion of the horizontal upper surface 29b of the control cam 29 in an arc shape along its circumferential surface 29a. This arm lifter cam 38 is provided over an angle of approximately 115 degrees, and is configured as a cam having a step on the top and bottom. The cam 38 has a horizontal cam surface 38a extending approximately 95 degrees from the upper surface 29b to a predetermined height, and is provided with a slope 38b that gradually descends from one end of the horizontal cam surface 38a to the upper surface 29b. ing. Also, the lower surface 2 of this control cam 29
9c is connected to the gear forming wall 36 in substantially opposite phase to the gear 37, and is connected to the peripheral surface 2.
A cam-forming wall 42 is provided substantially along 9b. Along this cam forming wall 42, a brake/mutating cam 39, a limiter cam 40, and a lead-in lever return cam 41 are installed.
and are sequentially provided in the counterclockwise direction in FIG.
And the brake/mutating cam 39
is provided on the outer surface of the cam forming wall 42 at an angle of approximately 130 degrees, and is structured as a cam having a step in the radial direction of the control cam 29. This cam 39 has four cam surfaces 39a, 39b, 39, ie, first, second, third, and fourth.
c, 39d, and three slopes 39e, 39f, 39g that interconnect these.
Regarding the steps in the radial direction of these first to fourth cam surfaces 39a to 39d, the radius _r1 of the fourth cam surface 39d is the largest, and the following are the first cam surface 39a, the third cam surface 39c, and the second cam surface. These radii r ₂ , r ₃ , and r ₄ are made smaller in order of 39b.
The cam 39 has an angle of approximately 75 degrees from the first cam surface 39a to the end of the second cam surface 39b, approximately 90 degrees to the beginning of the third cam surface 9c, and approximately 90 degrees from the third cam surface 39a to the beginning of the third cam surface 9c. The angle up to the end of the surface 39c is approximately 115 degrees. Further, the limiter cam surface 40 is provided on the inner surface of the cam forming wall 42 and has a substantially hook-shaped configuration. Note that this limiter cam 40 is connected to the second cam surface 3.
It is provided at a position approximately 130° from the beginning of section 9b. Further, the lead-in lever return cam 41 is provided on the inner surface of the cam forming wall 42.
This cam 41 is the limiter cam 40.
The radius r ₅ of the control cam 29 is formed into a gentle slope that gradually increases as the control cam 29 moves counterclockwise in FIG. A portion of the circumferential surface 29a of the control cam 29 is provided with a switch driving protrusion 43. Note that this protrusion 43
is formed into a cam having a substantially trapezoidal cross section.

And the lower surface 29c of this control cam 29
At a predetermined position is a return limiter 4 of the tone arm 5, as shown in FIGS. 4 and 5.
4 is installed. The return limiter 44 is rotatably supported on a fulcrum shaft 45 provided on the control cam 29, and one end thereof is configured as a pin driving portion 44a, and the other end is configured as a fan-shaped portion 44b. and the fan-shaped part 4
There are two positioning recesses 47 on the arcuate surface 46 of 4b.
a and 47b are provided at intervals. On the other hand, a small positioning ball 49 is provided on the control cam 29 and is pressed against the arcuate surface 46 by the spring force of a compression spring 48 and selectively engaged with one of the recesses 47a and 47b. The small ball holding portion 50 holds the small ball. Note that 51 is a contact plate screwed to the control cam 29 with screws 52.

The control cam 29 is constructed as described above, and as shown in FIG.
A worm 54 fixed to a motor shaft 53 is engaged with the gear 37 via a worm wheel 55 and a gear 56. Note that the worm wheel 55 and gear 56 are integrally molded with each other,
and the motor mounting plate 34 via the gear shaft 57.
It is rotatably supported.

Further, the arm lifter 12 is shown in FIGS. 2 and 3.
As shown in the figure, the vertical lifter shaft 6
0, a horizontal tone arm support arm 61 attached to the upper end of the lifter shaft 60 and formed in an arc shape, and a compression spring 62 that always urges the lifter shaft 60 downward. It is configured.

On the other hand, an arm lifter support portion 63 is provided in a part of the bearing block 19, and the lifter shaft 60
is inserted from above into a vertical insertion hole 64 provided in this arm lifter support portion 63, and is inserted through this to protrude below the main body frame 1. In this state, the lifter shaft 60 is configured to be movable in the vertical direction. Note that the lower end of this lifter shaft 60 is placed on the arm lifter cam 38 of the control cam 29. The compression spring 61 is connected to the lifter shaft 6.
The lifter shaft 60 is constantly pressed downward through a ring 66 inserted into the outer periphery of the lower end of the lifter shaft 60 and fitted onto the lower end of the lifter shaft 60.
Therefore, the spring force of the compression spring 61 presses the lifter shaft 60 onto the arm lifter cam 38.

Further, as shown in FIGS. 3 and 8, the lead-in lever 30 has one end 30b extending outwardly below the control cam 29. A pin 9 is provided at one end 30b. Note that this pin 69 extends both above and below the lead-in lever 30. The other end 69c of this lead-in lever 30 is disposed below and inside the control cam 29. A lead-in limiter 70 of the tone arm 5 is mounted on the other end 69c. This lead-in limiter 70 is rotatably supported on a fulcrum shaft 71 provided on the lead-in lever 30, and is supported by a tension spring 72 spanned between the lead-in lever 30 and the lead-in lever 30, as shown in FIG. It is rotated counterclockwise. A cam follower pin 73 is provided at one end of this lead-in limiter 70, and a protrusion 7 provided at the other end.
4 is configured to come into contact with a stopper 75 provided on the lead-in lever 30. And this lead-in limiter 70 is the pin 7
3 is inserted into the gear forming wall 36 and the cam forming wall 42 of the control cam 29 as shown in FIG. 36,
42 is pressed inside.

A drop position adjusting device 78 for the tone arm 5 is attached to one end 30b of the lead-in lever 30, as shown in FIGS. 8 and 9. Note that this drop position adjustment device 78 is connected to the drop position adjustment lever 31 and the one end 3.
It is composed of an adjustment cam 79 attached to 0b. A support portion 80 is provided at the one end 30b, and a vertical insertion hole 81 is provided in the support portion 80. An adjustment camshaft 82 is inserted into the insertion hole 81 from above, and the adjustment cam 79 is fixed to the lower end of the adjustment camshaft 82. A screwdriver insertion hole 83 is provided in the head 82a of the adjustment camshaft 82, and a disc spring 84 is provided between the head 82a and the support portion 80.
A relatively strong anti-rotation spring is interposed. Therefore, the spring force of the disc spring 84 pushes the adjustment camshaft 82 upwardly against the lead-in lever 30, and the adjustment cam 79 is strongly pressed against the lower surface of the lead-in lever 30. positioning force). The adjusting cam 79 is configured as an eccentric cam with respect to the adjusting cam shaft 82. On the other hand, the drop position adjustment lever 31, which is fitted into the boss 30a of the lead-in lever 30 and configured to be rotatable around the axis _P1 of the arm rotation shaft 6, is mounted between the lead-in lever 30 and The lead-in lever 30 is biased to rotate counterclockwise in FIG. 8 by a tension spring 85. The projection 86 provided at the tip of the drop position adjustment lever 31 is connected to the eccentric cam surface 79a of the adjustment cam 79.
is pressed by the spring force of the tension spring 85. Note that the adjustment cam 79 is provided at the one end 30b.
A pair of stoppers 86a, 86b is provided to prevent the adjustment cam 79 from being rotated unnecessarily large, and the adjustment cam 79 is brought into contact with the stoppers 86a, 86b by a projection 87 provided thereon. The adjustment camshaft 82 is configured to be located directly below a screwdriver insertion hole 88 provided at a predetermined position in the main body frame 1 when the lead-in lever 30 is returned to the stop position. There is. Therefore, in this state, the drop position of the tone arm 5 is adjusted by inserting a screwdriver or the like from the hole 88 into the driver insertion hole 83 of the adjusting camshaft 82 and adjusting the rotation of the adjusting camshaft 82. It is becoming possible to do this. Note that 89 is an arm drive surface provided on the lead-in lever 31 for horizontally driving the tone arm 5, and this arm drive surface 89 is a radial line passing through the axis _P1 of the arm rotation shaft 6. It is configured in a plane parallel to P ₂ .

Further, the brake drum 32 is shown in FIGS. 3 and 1.
As shown in FIG. 0, the braking surface 92, which has a substantially fan-like shape and is provided on the outer periphery thereof, is formed into a concentric circular surface centered on the axis _P1 of the arm rotating shaft 6. And this brake drum 9
A pin 93 is implanted on 2. Note that this pin 93 is constructed integrally with the arm rotating shaft 6 via the brake drum 92. This pin 93 passes through an arcuate elongated hole 94 provided in the mechanical shovel 28 and extends upward, and the upper end of the pin 93 reaches close to the lower surface 29c of the control cam 29. The lever pin 93 is configured to be alternately lead-in driven and returned driven by both limiters 70 and 44.

On the other hand, the shutter plate 33 also has a brake drum 3.
2, it has an almost fan shape, and a part of it has an armrest position detection hole 9 of the tone arm 5.
5 is provided, and one end thereof is configured as a record end position detection end surface 96 of the tone arm 5. Note that this record end position detection end face 96 is configured to be a plane parallel to a radial line P ₃ passing through the axis P ₁ of the AM rotating shaft 6 . Further, this shutter plate 33 is rotated clockwise relative to the brake drum 32 in FIG. It is energized. Note that 100 is the screw mounting portion 97.
The adjustment screw 100 is screwed into a horizontal screw hole 99, and the shutter plate 33 is brought into contact with the tip of the adjustment screw 100 by a protrusion 101 provided at the other end. By adjusting this adjustment screw 100, the tension spring 9
8, the angle of the shutter plate 33 with respect to the brake drum 32 can be adjusted.

As shown in FIGS. 10 and 11, the shutter plate 33 is associated with a position detection device 103 for optically detecting the position of the tone arm 5 and outputting an electrical signal. This position detection device 103 includes a light emitting element 104 such as a lamp, for example.
and a light receiving element 1 for photoelectric conversion such as CDS.
05. Both elements 104 and 105 are arranged above and below a predetermined position of the rotation locus of the armrest position detection hole 95 in the shutter plate 33. Note that the light emitting element 10
4 is attached via a holder 107 to a printed circuit board 106 screwed to the mechanical chassis 8, and the light receiving element 105 is attached to a printed circuit board 108 screwed to the lower end of the holder 107.

When the tone arm 5 is returned to the armrest position as shown by the solid line in FIG.
As shown by the solid line in FIG. 10, the armrest position detection hole 95 of the shutter plate 33 is located directly below the light emitting element 104. However, in this case, the light emitting element 104
The light emitted from the tone arm 5 is irradiated onto the light receiving element 105 through the hole 95, a signal is output from the light receiving element 105, and the armrest position of the tone arm 5 is detected. When the tone arm 5 is horizontally driven in the lead-in direction, the shutter plate 33 is rotated clockwise in FIG. 10 together with the tone arm 5. The moment the tone arm 5 leaves the armrest position, the light is blocked by the shutter plate 33, and the output signal of the light receiving element 105 is cut off. When the tone arm 5 reaches the record end position as shown by the dashed line in FIG. is irradiated onto the light receiving element 105 again. However, at this time, since the tone arm 5 is rotated at high speed at the record end position, the light receiving area of the light receiving element 105 is suddenly increased, and based on this, a signal is output from the light receiving element 105, and the tone arm 5 The record end position is configured to be detected.

As shown in FIGS. 3 and 8, a brake lever 110 is disposed on the mechanical chassis 28 at a position corresponding to the upper portion of the brake drum 32. This brake lever 110 has one end 11
0a is rotatably supported on a fulcrum shaft 111 provided on a mechanical chassis 110, and is rotated counterclockwise in FIG. 8 by a tension spring 112 spanned between it and the mechanical chassis 28. has been done. A protrusion 113 is bent downward at approximately the center of the brake lever 110 in the longitudinal direction. This protrusion 113 is inserted through an insertion hole 114 provided in the mechanical chassis 28, extends below the mechanical chassis 28, and reaches the side of the brake application surface 92 of the brake drum 32. A brake shoe 115 is attached to this protrusion 113 and can be pressed against and separated from the brake application surface 92. Further, a cam follower pin 116 is provided at the upper portion of the brake lever 110 in the longitudinal center thereof.
This pin 116 extends upward, and its upper end reaches a lateral position of the braking/mutating cam 39 of the control cam 29. The spring force of the tension spring 112 pushes the brake and muting cam 39 as shown in FIG.

Further, as shown in FIGS. 3 and 10, a stopper plate 119 is disposed at the rotation locus of the lower end of the pin 69 of the lead-in lever 30. This stopper plate 119 has one end 1
At 19a, a tension spring 121 is rotatably supported on a fulcrum shaft 120 provided below the mechanical chassis 28, and is spanned between the mechanical chassis 28 and the tension spring 121.
It is rotated counterclockwise in FIG. 10 by . An electromagnetic magnet 122 is disposed opposite to the outside of this stopper plate 119. This electromagnetic magnet 122 is attached to a magnet mounting portion 1 which is bent into a part of the mechanical chassis 28.
It is attached to 23. When the electromagnetic magnet 122 is deenergized (non-energized), the stopper plate 119 is brought into contact with the stopper 124 provided on the mechanical chassis 28 by the spring force of the tension spring 121, as shown in FIG. However, in this state, the stopper plate 119 escapes to the inside of the rotation locus of the pin 69 of the lead-in lever 30.

Further, as shown in FIGS. 2 and 6, a size selector cam 127 for selecting a record size is disposed at the rotation locus of the upper end of the pin 69 of the lead-in lever 30. This size selector cam 127 is rotatably supported on a fulcrum shaft 128 that is implanted on the upper surface of the main body frame 1 and extends downward. Three cams 129a, 129b, and 129c are provided on the circumferential surface of this size selector cam 127 for substantially selecting record sizes of 17 cm, 25 cm, and 30 cm. Note that these three cams 129a, 129b, 1
29c is formed into three concentric circular surfaces centered on the fulcrum shaft 128. On the other hand, the size selection knob 14 is fixed to the upper end of a selection shaft 130 which is inserted through the main body frame 1 and is rotatably attached. And this select axis 13
One end of an interlocking rod 133 is attached to a pin 134 at the tip of a lever 132 that is screwed to the lower end of 0 with a screw 131.
The other end of the interlocking rod 133 is connected to the selector cam 127 via a pin 135. Note that the size selection knob 1
There are three positioning recesses 136 on the lower surface 14a of 4.
a, 136b, and 136c are provided at equal intervals and on the same circular line. On the other hand, a small positioning ball 138 is pressed against the lower surface 14a by the spring force of a compression spring 137 and is designed to be selectively engaged with one of the recesses 136a, 136b, and 136c. It is held in a small ball holding section 139 provided therein. A size scale 140 indicating record sizes of 17 cm, 25 cm, and 30 cm is displayed on the upper surface of the main body frame 1 at the outer periphery of the size select knob 14.

Then, by rotating and adjusting the size select knob 14 to match the size scale 140, the size selector cam 127 is rotationally adjusted around the fulcrum shaft 128 via the select shaft 130, lever 132, and interlocking rod 133, and the lead-in Lever 3
Three cams 129a, 12 for pin 69 of 0
The positions of 9b and 129c are adjusted. At this time, the small ball 138 is selectively clicked into one of the recesses 136a, 136b, and 136c by the spring force of the compression spring 137, and the size selector knob 14 is positioned, so that the size selector cam 127 is positioned.

Note that 141 shown in FIGS. 3, 7, and 8
142 is a pin for setting the limiter 44, which is installed at the upper part of the mechanical chassis 28 at a predetermined position, and 142 is the lead-in lever 30, which is installed at the upper part of the mechanical chassis 28 at a predetermined position.
It is a stopper. The rotation angle of the control cam 29 is regulated by the mutual contact between the setting pin 141 and the stopper 142, the lead-in lever 30, and the limiter 44.

Further, as shown in FIG. 6, on the outer periphery of the rotation locus of the switch drive protrusion 43 of the control cam 29, there is a system control device on the mechanical chassis 28 for detecting the position of the control cam 29. Three position detection switches SW
11 to SW13 are installed. These position detection switches SW11 to SW13 are constituted by microswitches, and the projections 43 are configured to press and drive these push buttons SW11' to SW13'. However, the switch
SW11 and SW12 are arranged at an angle of approximately 90°, and switches SW12 and SW13 are arranged at an angle of approximately 40°.
It is placed at an angle of °. Further, a protrusion 143 for driving a switch is bent downward from one side of the tip 110b of the brake lever 110. A mutating switch is installed at the bottom of the mechanical chassis 28 opposite to this protrusion 143.
SW14 is installed. Note that this muting switch SW14 is composed of a micro switch, and is turned on when the push button SW14' is not pressed.
It is configured as a normally closed switch that is turned off when SW14' is pressed.

Next, the operation of the record player system described above will be explained.

〔Turntable〕

The rotation and stopping of the turntable 2 is controlled independently of the tone arm 5 by a dedicated motor 4 using a start/stop switch SW6.

[Tone arm]

Tone arm 5 is a switch for tone arm
It is controlled by SW1 to SW5 independently of the turntable 2.

That is, when you turn on the start switch SW1,
The motor 8 is driven to rotate forward, and the motor shaft 53 - worm 54 - worm wheel 55 - gear 56 -
The control cam 29 is connected to the first
In Figure 2, it is rotated in the clockwise direction. Lead-in control of the tone arm 5 is performed by the forward rotation of the control cam 29. Note that when the record reaches the end when playing a record, the position detection device 103 is activated and the motor 8 is rotated in the reverse direction.
The control cam 29 is rotated counterclockwise in FIG. 12. Return control of the tone arm 5 is performed by the reverse rotation of the control cam 29. Redirect switch in the same manner as below.
When SW2 is turned on, the control cam 29 is driven in reverse rotation to perform return control of the tone arm 5, and when down switch SW4 is turned on, the control cam 29 is driven in forward rotation.
When the tone arm 5 is controlled down and the up switch SW5 is turned on, the control cam 29 is driven to rotate in the opposite direction, and the tone arm 5 is controlled up.

However, at this time, as shown in FIG. 12, the forward and reverse rotation angle of the control cam 29 is set to approximately 130 degrees between the position detection switches SW11 and SW13, and the control cam 29 rotates through the above 130 degrees. Lead-in and return of the tone arm 5 are controlled by rotating forward and backward within the angle. At this time, within the rotation angle of approximately 90 degrees between the position detection switches SW11 and SW12 is the lead-in and return section of the tone arm 5, and the position detection switch SW12
The down and up sections of the tone arm 5 are within the rotation angle of approximately 40 degrees between the SW13 and the SW13.

Each control operation of the tone arm 5 will be explained below.

[Stop state]

First, in this stopped state, the tone arm 5 is returned to the armrest 13 as shown by the solid line in FIG. In addition, in this stopped state, as shown in FIGS. 6 to 12, the control cam 29 and its associated lead-in lever 30, drop position adjustment lever 31, brake drum 32,
All mechanisms, such as the shutter plate 33, have been moved back to the stop position.

And in this stopped state, arm lifter 1
As shown in FIG. 6, the second lifter shaft 60 is pushed up onto the horizontal cam surface 38a of the arm lifter cam 38, and the arm lifter 12 is in the up state. Therefore, the tone arm 5 is kept stationary on the armrest 13 in an up state.

Further, in this stopped state, the protrusion 143 of the brake lever 110 is separated from the push button SW14' of the muting switch SW14, as shown in FIG. Therefore, in this state, the mutating switch
The SW 14 is in the ON state, and the output circuit of the tone arm 5 resting on the armrest 13 is already muted (the output is shot).

Further, in this stopped state, the pin 116 of the brake lever 110 is pushed up onto the first cam surface 39a of the braking/mutating cam 39 as shown in FIG. Therefore, in this stopped state, the brake shoe 115 of the brake lever 110 is separated from the brake application surface 92 of the brake drum 32, and
The brake of tone arm 5 has been released.

In addition, in this stopped state, the protrusion 43 of the control cam 29 is activated by the position detection switch as shown in FIG.
Push button SW11' of SW11 is pressed.

Also, in this stop state, the position detection device 10
3, the armrest position of the tone arm 5 is detected.

[Start operation]

When the start switch SW1 is turned on, the motor 8 rotates forward and the control cam 29 rotates in the seventh position.
In the figure, it is rotated clockwise at a rotation angle of approximately 130 degrees.

With the start of the forward rotation of the control cam 29, the torque of the control cam 29 is transmitted to the lead-in lever 30 via the arm lead-in limiter 70 engaged with the limiter cam 40, and the lead-in lever 30 The inlever 30 is also rotated in the clockwise direction. The drop position adjustment lever 31 is also rotated in the clockwise direction together with the lead-in lever 30.

When the control cam 29 is rotated approximately 15 degrees in the normal direction, the arm drive surface 89 of the drop position adjustment lever 31 comes into contact with the pin 93 of the brake drum 32, as shown in FIG. 13A. Push the pin 93 in the clockwise direction. As a result, the above-mentioned clockwise rotation force is applied to the tone arm 5 via the pin 93, the brake drum 32, and the arm rotation shaft 6, and the tone arm 5 is separated from the arm rest 13, and the arm lifter 12
is horizontally rotated clockwise in FIG. 1 on the arm portion 61 of FIG. 1, and lead-in is started.

Further, when the control cam 29 is rotated approximately 15 degrees in the normal direction, the pin 116 of the brake lever 110 reaches the slope 39c of the brake/mutating cam 39 and the second cam surface 39 as shown in FIG. 13A.
fall into b. As a result, the brake lever 110 is rotated counterclockwise by the tension spring 112 as shown in FIG.
It is pressed against the brake action surface 92 of No. 2. Therefore, the brake is applied to the tone arm 5 almost simultaneously with the start of the lead-in of the tone arm 5, and the tone arm 5 is lead-in at a constant speed on the arm portion 61 of the arm lifter 12 while its inertia is suppressed by the brake. .

As the tone arm 5 is lead-in, the pin 69 of the lead-in lever 30 gradually approaches the size selector cam 127, and eventually the first
As shown in Figure 3B, the pin 69 connects the three cams 129a, 1 of the size selector cam 127 at its upper end side.
It comes into contact with one of the cams 29b and 129c, which is preset according to the size of the record R. Then, at the moment of contact, the lead-in lever 3
0 is prevented from rotating, and this lead-in lever 30
For example, the tone arm 5 that was driven by
The tone arm 5 is stopped at a position on the record R shown by the two-dot chain line in the figure, and the lead-in of the tone arm 5 is completed at this point. Note that this lead-in operation of the tone arm 5 is performed within a rotation angle of approximately 75 degrees of the control cam 29.

Since the control cam 29 continues to rotate in the forward direction, the lead-in limiter 70 is rotated clockwise about the fulcrum shaft 71 against the tension spring 72, as shown by the chain line in FIG. 13B.
The pin 73 is removed inward from the limiter cam 40. And at that moment, the control cam 29
The drive of the lead-in lever 30 is cut off, and the drive of the tone arm 5 by the lead-in lever 30 is also cut off.

At this time, after the pin 73 of the lead-in limiter 70 is removed from the limiter cam 40, it is subsequently pressed against the lead-in lever return cam 41 by the spring force of the tension spring 72. The pin 73 is pressed against the cam 41 because the cam 41 is formed into a smooth slope whose radius _r5 gradually increases as it reaches the rear side in the direction of rotation of the control cam 29. Instantaneously, a component force is applied to the limiter 70 in the counterclockwise direction in FIG. 13B due to the cam action of the cam 41 and the pin 73. And that force remains the limiter 70.
Because it is transmitted to the lead-in lever 30 via
The lead-in lever 30 is returned counterclockwise as shown by the chain line in FIG. 13B. In FIG. 13B, the lead-in lever 30 is shown by a chain line as if it has been returned by a large angle, but in reality, the cam 41 is rotated clockwise by the forward rotation of the control cam 29. This lead-in lever 30
The return angle is extremely small. Then, as the lead-in lever 30 is automatically returned as described above, the arm drive surface 89 of the drop position adjustment lever 31 is separated from the pin 93 of the brake drum 32. As a result, the mechanical connection between the tone arm 5 and its horizontal drive system is completely severed at this moment, and the tone arm 5 is brought down extremely smoothly without being mechanically restrained in any way when it is brought down, which will be described later. .

When the control cam 29 is rotated approximately 85 degrees in the normal direction, the pin 116 of the brake lever 110 passes through the slope 39f of the brake/mutating cam 39 and reaches the third cam surface 39c, as shown in FIG. 13C.
ride on. As a result, the brake lever 110 is rotated clockwise against the tension spring 112 as shown in FIG. 13C, and the brake shoe 115 is separated from the brake application surface 92 of the brake drum 32. At that moment, the brake of the tone arm 5 is released.

On the other hand, with the forward rotation of the control cam 29, the arm lifter cam 38 also rotates, and the lifter shaft 60 of the arm lifter 12 is relatively slid on the horizontal cam surface 38a of the cam 38. When the control cam 29 is rotated approximately 90 degrees in the normal direction, the lifter shaft 60 is rotated toward the horizontal cam surface 38a.
reaches the end on the slope 38b side.

When the control cam 29 is rotated approximately 90 degrees in the normal direction, the protrusion 43 of the control cam 29 presses the push button SW12' of the position detection switch SW12, turning it on, as shown in FIG. 13C. As a result, completion of lead-in of the tone arm 5 is detected.

Then, by the subsequent forward rotation of the control cam 29, the tone arm 5 is lowered.

At this time, first, when the control cam 29 is rotated approximately 115 degrees forward following the above-mentioned procedure, the arm lifter cam 38 and the compression spring 6 of the lifter shaft 60 are rotated.
1, the lifter shaft 60 engages the cam 38.
The arm lifter 12 is lowered by relatively sliding down the slope 38b and onto the upper surface 29b of the control cam 29. However, due to the down movement of the arm lifter 12, the tone arm 5 placed on the arm portion 61 is brought down, and the needle 10 of the cartridge 10 is moved down.
a will be placed on the record R on the turntable 2.

Note that at this point, muting is still being applied, so no unpleasant noise is generated at the moment the needle 10a comes into contact with the record R.

Next, when the control cam 29 is rotated approximately 123 degrees in the normal direction, the pin 116 of the brake lever 110 reaches the slope 39g of the brake/mutating cam 39 and reaches the fourth cam surface 39d, as shown in FIG. 13D.
ride on top. As a result, the brake lever 110
is further rotated clockwise in FIG. 13D against the tension spring 112, and its protrusion 143 pushes the push button SW14' of the mutating switch SW14.
Then, the muting switch SW14 is turned off and muting is canceled.

Finally, the control cam 29 is
When the 130° forward rotation is completed, the protrusion 43 touches the push button of the position detection switch SW13 as shown in Fig. 13D.
Press SW13' to turn it on. As a result, completion of lead-in of the tone arm 5 is detected.

Immediately before the above, as shown in FIG. 13D, the return limiter 44 is brought into contact with the setting pin 141 by its pin driving portion 44a, and is relatively pushed by the setting pin 141, so that the fulcrum shaft 45
It is rotated counterclockwise around the center. As a result, the limiter 44 is automatically set to the return state in which the pin 93 of the brake drum 32 can be driven by the pin driving portion 44a. At this time, due to the rotation of the limiter 44, the small ball 49 passes over the arcuate surface 46 from one recess 47a and is engaged with the other recess 47b, so that the limiter 44 is fixed again in the set state.

Then, the return limiter 44 is brought into contact with the setting pin 14, so that the control cam 2
9 is stopped, and the position detection switch SW
13 is switched to the on state, motor 8
will be stopped.

With the above-described series of operations, the series of lead-in operations of the tone arm 5 is completed, and the record performance is started.

[Stop operation]

Redirect switch SW2 while playing a record
When turned on, the motor 8 is rotated in the opposite direction, and the control cam 29 is rotated approximately counterclockwise in FIG. 13D.
It is driven in reverse rotation with a rotation angle of 130°.

When the control cam 29 is reversely rotated by about 15 degrees, the pin 116 of the brake lever 110 reaches the slope 39g of the brake/mutating cam 39 and reaches the third cam surface 39, as shown in FIG. 13E.
fall on c. As a result, the brake lever 110
is rotated counterclockwise in FIG. 13E by the tension spring 112, and its protrusion 143 separates from the push button SW14' of the mutating switch SW14. Then this muting switch SW14
is switched to the on state, and mutating is applied from this moment on.

As the control cam 29 rotates in the opposite direction, the arm lifter cam 38 also rotates, and when the control cam 29 is rotated approximately 35 degrees in the opposite direction,
The lifter shaft 60 is connected to the slope 38 of the lifter cam 38
The arm lifter 12 is moved up by relatively sliding up the horizontal cam surface 38a of the cam 38. However, due to the upward movement of the arm lifter 12, the arm portion 6
At step 1, the tone arm 5 is raised and the needle 10a of the cartridge 10 is released above the record R.

Note that since muting has already been applied at this point, no unpleasant noise will be generated at the moment the needle 10a of the cartridge 10 leaves the record R.

Then, when the control cam 29 is reversely rotated by about 40 degrees and the tone arm 5 is raised as described above, the control cam 29 is rotated approximately 40 degrees in the opposite direction.
The protrusion 43 of 9 presses the push button SW12' of the position detection switch SW12, turning it on. As a result, completion of raising the tone arm 5 is detected.

Then, when the control cam 29 is reversely rotated approximately 45 degrees following the above, the pin 116 of the brake lever 110 passes through the slope 39f of the brake/mutating cam 39 to the second cam surface 39b, as shown in Fig. 13G. I feel depressed. As a result, the brake lever 110 is moved to the 13th G by the tension spring 112.
The tension spring 1 is rotated counterclockwise as shown in the figure.
The brake shoe 115 is pressed against the brake application surface 92 of the brake drum 32 by the force of the spring 12 . Therefore, from this moment on, the tone arm 5 is braked via the brake drum 32.

Further, when the control cam 29 is reversely rotated by approximately 55 degrees, the return limiter 44 comes into contact with the pin 93 of the brake drum 32 by its pin driving portion 44a, as shown in FIG. 93 in the above counterclockwise direction.
As a result, the above-mentioned rotational force in the counterclockwise direction is applied to the tone arm 5 via the pin 93, the brake drum 32, and the arm rotation shaft 6.
is horizontally rotated counterclockwise in FIG. 1 on the arm portion 61 of the arm lifter 12, and the return is started. Note that during this return, as during the lead-in, the tone arm 5 is horizontally rotated at a constant speed with its inertia suppressed by the brake.

On the other hand, due to the above-mentioned reverse rotation of the control cam 29, the lead-in lever return cam 41 approaches the pin 73 of the lead-in limiter 70, and eventually they come into further contact as shown by the chain line in FIG. 13H. Thereafter, due to the continued reverse rotation of the control cam 29, the lead-in lever return cam 41 moves the lead-in lever 30 counterclockwise as shown in FIG. 13H via the lead-in limiter 70, as shown by the solid line in FIG. 13H. When pressed, the lead-in lever 30 and drop position adjustment lever 31 are rotated counterclockwise together with the control cam 29.

When the control cam 29 is reversely rotated by approximately 115 degrees, the return of the tone arm 5 is completed and the tone arm 5 is returned to the armrest 13 as shown by the solid line in FIG.

Note that when the tone arm 5 is returned to the armrest 13, the armrest position of the tone arm 5 is detected by the position detection device 103.

When the tone arm 5 returns to the armrest 13 and stops, the pin 93 of the brake drum 32 is also stopped at that position. Then, due to the subsequent reverse rotation of the control cam 29,
As shown in FIG. 13I, the return limiter 44 is pushed in the opposite direction by the pin 93 that has been pushed so far and is rotated clockwise about the fulcrum shaft 45. As a result, the limiter 44 is automatically reset to a state in which the pin 93 of the brake drum 32 cannot be driven by the pin drive section 44a. At this time, due to the rotation of the limiter 44, the small ball 49 passes over the arcuate surface 46 from the other recess 47b and is engaged with one recess 47a, so that the limiter 44 is fixed again in the reset state.

Then, when the control cam 29 is reversely rotated approximately 123 degrees, the pin 116 of the brake lever 110 passes through the slope 39e of the braking/mutating cam 39 and reaches the first cam surface 39, as shown in FIG.
Climb onto a. As a result, the brake lever 110
is rotated clockwise against the tension spring 112 as shown in FIG. 13I, and the brake shoe 115 is separated from the braking surface 92 of the brake drum 32. At that moment, the brake of the tone arm 5 is released.

At this time, the protrusion 143 of the brake lever 110
approaches the mutating switch SW14, but does not push the push button SW14'. Therefore, the muting switch SW14 is still kept in the on state.

When the control cam 29 is finally rotated 130 degrees in the opposite direction, its protrusion 4 is rotated as shown in Fig. 13I.
3 is the push button SW1 of the position detection switch SW11
Press 1' to turn it on. As a result, completion of the return of the tone arm 5 is detected.

Immediately before the above, the lead-in lever 30 comes into contact with the stopper 142 as shown in FIG. 13I, and the rotation of the lead-in lever 30 is stopped. At the next moment, the lead-in limiter 70 passes over the lead-in lever return cam 41 by its pin 73 and is engaged in the limiter cam 40 as shown by the chain line in FIG. 13I, and as shown in FIG. The state will be restored. At the same time, the pin drive section 44a of the arm return limiter 44
When a portion of the control cam 29 comes into contact with the drop position adjustment lever 31, the rotation of the control cam 29 is stopped, and the position detection switch SW11 is turned on, so that the motor 8 is stopped.

With the above series of operations, the series of return operations of the tone arm 5 is completed.

In this record player system, if you turn on the start switch SW1 and then immediately turn on the redirect switch SW2,
Control cam 29 is position detection switch SW1
The system control circuit controls the system so that the moment the motor 2 is turned on, the motor 8 is rotated in the opposite direction, the tone arm 5 is stopped in the middle of lead-in, and only the control cam 29 is rotated in the reverse direction, returning to the original stop state. be done.

[Auto stop operation]

When the record performance ends and the tone arm 5 reaches the record end position as indicated by the dashed line in FIG. 1, the position detecting device 103 detects the record end position of the tone arm 5. Then, based on this, the motor 8 is rotated in the reverse direction, and the control cam 29 is driven to rotate in the counterclockwise direction in FIG. 13D. As a result, the tone arm 5 is automatically returned in exactly the same manner as the stop operation described above.

[Repeat operation]

When the repeat switch SW3 is turned on after turning on the start switch SW1, the start mode is memorized in the system control circuit, and after the stop operation described above, the start operation described above is repeatedly performed.

[Down operation]

In this record player system, when the tone arm 5 is returned to the arm rest position, the tone arm 5 is always raised by the arm lifter 12. Therefore, by manually sliding the tone arm 5 on the arm lifter, it is possible to freely set the tone arm 5 from the arm rest position to any position on the record R, that is, to perform manual lead-in.

After the manual lead-in, when the down switch SW4 is turned on, the motor 8 rotates forward in the same way as during the start operation described above, and the control cam 29 rotates approximately 115 clockwise in Fig. 7.
When the tone arm 5 is rotated in the normal direction, the tone arm 5 can be automatically lowered onto the record R as described above.

However, during this auto-down operation, in this record player system, when the down switch SW4 is turned on as described above, the system control circuit performs system control such that the electromagnetic magnet 122 is energized (energized).

Therefore, at the same time that the control cam 29 starts rotating in the forward direction, the electromagnetic magnet 122 is energized, and the stopper plate 119 is electromagnetically attracted to the electromagnetic magnet 122 as shown in FIG. It is rotated against the spring 121 from the original position indicated by the chain line in FIG. 14 to the position indicated by the solid line. As a result, the pin 69 of the lead-in lever 30, which has been rotated counterclockwise in FIG. 14 together with the control cam 29, comes into contact with its lower end 119b, and the lead-in lever 30 is thereafter stopped at that position. At this time, the lead-in limiter 70 is removed from the limiter cam 40 at the moment the lead-in lever 30 stops.

Therefore, in this record player system, during this auto-down operation, the auto lead-in operation of the tone arm 5 by the lead-in lever 30 is automatically reset, and the auto lead-in operation must be manually reset in advance. Moreover, the tone arm 5 can be turned down by simply turning on the down switch SW4.

Also, during this auto-down operation, in this record player system, the system control circuit controls the motor 8 within a rotation angle of approximately 90° between the position detection switches SW11 and SW12 of the control cam 29, that is, within the lead-in section. The system control is performed so that the rotational speed is increased and the control cam 29 is rotated at a higher speed than the normal speed within the lead-in section.

Therefore, during this auto-down operation, the time required for the control cam 29 to rotate within the lead-in section, which is a loss time, is significantly shortened compared to the above-mentioned start operation. As a result, the waiting time from when the down switch SW4 is turned on until the tone arm 5 starts auto-down is very short, and this auto-down operation is performed very quickly. However, even in this case, the position detection switch SW12 and SW of the control cam 29
13, that is, within the down section, the rotational speed of the motor 8 is lowered and the control cam 29 is rotated at the normal speed.
The auto-down operation of the tone arm 5 is performed at a safe speed in the same manner as the start operation described above.
Note that when the control cam 29 finishes rotating approximately 130 degrees in the normal direction, the motor 8 stops, and the electromagnetic magnet 12
2 is deactivated.

[Up movement]

When the up switch SW5 is turned on during a record playback, the motor 8 is rotated in the opposite direction in the same way as during the stop operation described above, and the control cam 29 is turned on.
When the tone arm 5 is rotated approximately 40 degrees counterclockwise in FIG. 13D, the tone arm 5 is raised onto the record R as described above.

However, during this up operation, in this record player system, the system control circuit turns on the position detection switch SW11, detects that the tone arm 5 is up, and
Immediately before tone arm 5 starts returning,
The system controls the motor 8 to stop and the control cam 29 to stop at that position.

After this up operation, press the down switch SW.
4 is turned on, the motor 8 is rotated in the forward direction, and the system control circuit is controlled by the system control circuit so that the control cam 29 returns to its original record playing state as shown in FIG. 13D, that is, to the state in which the forward rotation is completed.

Therefore, according to this record player system, the tone arm 5 can be turned up and down electrically by the operation switches SW5 and SW4.
Moreover, the control cam 29 for lead-in and return control can be used as is to perform the above-mentioned up and down control, resulting in a very simple structure.

Next, features of this record player system other than those mentioned above will be explained in order.

[Start and stop operations] As described above, in this record player system, the motor 8 is rotated forward and backward by the start switch SW1 and the rigid switch SW2, and the control cam 29 is rotated forward and backward. Start and stop are controlled separately. Therefore, there is no wasted loss time in each operation, and the start switch SW1 and the redirect switch SW2 are followed with quick response operations.

Moreover, at this time, the control cam 29, which rotates around the axis _P1 of the arm rotation shaft 6, controls the three position detection switches SW11 arranged around the control cam 29.
~SW13 is configured to control the forward and reverse rotation of the motor 8, and it is also configured to control the down and up of the tone arm, so one tone arm dedicated motor is used to control the tone All modes of arm 5, including lead-in, return, down, and up, can be controlled extremely easily. Therefore, tone arm 5
Operate all of the above controls with switch SW1~
Since it can be done electrically using SW5, the operability is very high and the structure is very simple.

[Limiter]

In this record player system, as described above, the tone arm drive device 25 is provided with a limiter that works in both the lead-in and return directions of the tone arm 5, the lead-in limiter 70 and the return limiter 44, so that automatic operation is possible. Above all, the tone arm 5 can be freely set at any position.

[Cutting performance]

In this record player system, as described above, the tone arm 5 can be freely set (manual lead-in) at any position on the record R by manual operation. Further, the tone arm 5 can be freely turned down and up using the down switch SW4 and the up switch SW5. Furthermore, the turntable 2 can be freely rotated and stopped by a start/stop switch SW6, independent of the automatic mechanism.

Therefore, cueing performance can be performed freely and always quickly.

[Reject by manual operation]

In this record player system, as mentioned above, the arm lead-in limiter 70 is removed from the limiter cam 40 while the record is being played.
It is in a free state with respect to the control cam 29. Therefore, in the middle of playing a record, the tone arm 5 can be freely reset manually to the armrest position.

However, during the manual redirect operation of the lever, in this record player system, the tone arm 5 is returned to the armrest position by the system control circuit, and when the armrest position is detected by the position detection device 103, the motor 8 is rotated in the reverse direction. Then, the control cam 29 is rotated approximately 130 degrees counterclockwise as shown in FIG. Control the system. However, at this time, as in the above-described stop operation, the tone arm 5
will be uploaded automatically.

That is, when the tone arm 5 is manually returned to the armrest position during a record performance, the tone arm drive device 25 is automatically reset and the tone arm 5 is automatically raised. Therefore, even if the tone arm 5 is carelessly removed from the armrest 13, the tone arm 5 will not fall onto the turntable 2, and the needle 10a of the cartridge 10 or the record R will not be damaged, making it safe. Very sensitive. Furthermore, as described above, since muting is working on the tone arm 5 on the armrest 13, the cartridge 10 can be replaced without reducing the volume of the amplifier.
Furthermore, during this manual redirect operation, the tone arm 5 can be raised without having to perform a stop operation each time, so operability is very high.

[Mumuting control]

In this record player system, since the arm lifter 12 and mutating are linked as described above, no unpleasant noise is generated when the needle 10a of the cartridge 10 contacts and separates from the record R.

Moreover, at this time, the brake lever 110 is controlled by the brake/mutating cam 39 provided on the control cam 29 that controls the lead-in, return, down, and up of the tone arm 5, and the rotation of the brake lever 110 in one direction is controlled. Since the structure is configured so that the brake is applied to the tone arm 5 and the mutating switch SW 14 is controlled by rotation in the other direction, one brake lever 110 can perform both brake control and muting control of the tone arm 5. It can perform two operations and has a very simple structure. Furthermore, there is little deviation in the timing of the braking and muting operations relative to the movement of the tone arm 5, and these operations can accurately follow the movement of the tone arm 5, resulting in very accurate operations.

[Tone arm drive device]

In this record player system, the tone arm drive device 25, which has an automatic mechanism such as the control cam 29 and the lead-in lever 30, which perform lead-in, return, etc. of the tone arm 5 as described above, is attached to the lower end of the arm rotation shaft 6. The arm rotation shaft 6 is connected between the main body frame 1 and the brake drum 32, which operates integrally with the tone arm 5.
Attached to the outer peripheral position of the tone arm drive device 25
control cam 29, lead-in lever 30
The automatic mechanism is configured to horizontally rotate about the axis _P1 of the arm rotation shaft 6, and the automatic mechanism controls the lead-in and return of the tone arm 5. Since the center of rotation of the tone arm 5 and the center of the swing angle of the tone arm 5 are perfectly aligned, there is no mechanical shift or loss between them when the tone arm 5 is driven, and the tone arm 5 can be moved smoothly at all times. , and can be controlled accurately. Moreover, since the automatic mechanism is attached to the outer circumferential position of the arm rotation shaft 6, there is very little deviation in dimensions after assembly, and reliability is very high.

[Tone arm height adjustment]

In this record player system, as described above, the height of the tone arm 5 can be adjusted for the purpose of correcting the horizontality of the tone arm 5 caused by replacing the cartridge 10 of the tone arm 5.

That is, as shown in FIG. 15, by loosening the height adjustment screw 20, the arm rotation shaft 6 can be adjusted up and down with the sleeve 17 with respect to the bearing block 7, thereby adjusting the tone arm 5. The height can be adjusted. After adjusting the height, the height adjustment screw 20 is tightened again to fix the sleeve 17 to the bearing block 7, and position the sleeve 17 and the arm rotation shaft 6 at predetermined positions.

However, with this record player system,
Since the tone arm drive device 25 is attached to the sleeve 17 that moves up and down with the arm rotation shaft 6,
During the height adjustment, the entire tone arm drive device 25 is moved up and down together with the arm rotation shaft 6 and the sleeve 17. Therefore, during the above-mentioned height adjustment, no fluctuation or deviation in the relative positional relationship occurs in the interlocking system of the automatic mechanism between the tone arm 5 and the tone arm drive device 25. As a result, due to the above-mentioned height adjustment, it is difficult for variations such as positional deviation to occur in the drop position of the tone arm 5 relative to the record R, for example.
The tone arm 5 can always be driven accurately.

In this player system, a wide spur gear is used to connect the control cam 29 of the tone arm drive device 25 and its drive motor 8.
Since the gears 37 and 56 are slid during the height adjustment, the height adjustment can always be easily performed.

[Arm lifter device]

In this record player system, as described above, the arm lifter cam 38, which is a cam for controlling the elevation of the arm lifter 12, is provided on the control cam 29, and the lifter shaft 60 of the arm lifter 12 can be moved up and down with respect to the bearing block 7. The lifter shaft 60 is always pressed onto the control cam 29 by a compression spring 62, and the control cam 29 is moved up and down together with the arm rotation shaft 6 when adjusting the height of the tone arm 5. As shown in FIG. 15, the control cam 29 is moved up and down together with the arm rotation shaft 6 when adjusting the height of the tone arm 5, and the arm lifter 12 is also moved up and down in accordance with the control cam 29. Movement is adjusted. Therefore, when adjusting the height, the height of the arm lifter 12 is automatically corrected together with the tone arm 5.
Even after performing the above height adjustment, the mutual height between the tone arm 5 and the arm lifter 12 does not change at all,
This is always kept constant. Therefore, there is no need to correct the height of the arm lifter 12 each time the height adjustment is performed, and the adjustment is very simple. Moreover, an arm lifter cam 38 is provided on the control cam 29 that performs lead-in and return control of the tone arm 5.
Since the arm lifter 12 is configured to be controlled to move up and down, it is very easy to time the lead-in and return operations and the down and up operations of the tone arm 5. There is hardly any deviation between the two, and the tone arm 5 can always be controlled extremely accurately in a predetermined timing mode.

[Brake device]

In this record player system, as mentioned above, a light brake is applied to the tone arm 5 during the lead-in and return operations of the tone arm 5 to stabilize the movement of the tone arm 5. Control cam 2 that controls lead-in and return of arm 5
9 and the brake lever 110 controlled by this control cam 29 are configured to be moved up and down together with the arm rotation shaft 6 when adjusting the height of the tone arm 5, so that the height of the tone arm 5 can be adjusted. At times, no mechanical deviation or the like occurs in the relative relationship between the control cam 29, the brake lever 110, and the brake drum 32 integrated with the arm rotation shaft 6. Therefore, the above-mentioned height adjustment is less likely to adversely affect the brake timing or brake pressure of the tone arm 5. Moreover, since the brake lever 110 is controlled by the control cam 29 that controls the lead-in and return of the tone arm 5, the on/off timing of the brake can always follow the movement of the tone arm 5 extremely accurately. Brake control of arm 5 can always be performed extremely accurately.

[Tone arm drop position adjustment]

In this record player system, as described above, by rotating and adjusting the adjustment cam 79 with a screwdriver as shown in FIG. By adjusting the relative angle _θ1 between the lever 30 and the drop position adjustment lever 31, it is possible to adjust the position of the brake drum 32 when the pin 69 of the lead-in lever 30 contacts the size selector cam 127 during the aforementioned lead-in operation. By adjusting the stop position of the pin 93, the drop position of the tone arm 5 relative to the record R can be adjusted.

However, with this record player system,
Since the configuration is such that the relative angle between the lead-in lever 30 and the drop position adjustment lever 31 is adjusted around the axis _P1 of the arm rotation shaft 6, which is the center of rotation of the lead-in lever 30, the lead-in lever 30 is brought into contact with the size selector cam 127 by its pin 69, and the position of the arm drive surface 89 that pushes the pin 93 that moves together with the tone arm 5 of the drop position adjustment lever 31. The drop position can be adjusted without changing the distances L ₁ and L ₂ from P ₁ at all. Therefore, the lead-in lever 30 is connected to its pin 69.
Size selector cam 127 by 17cm, 25
There is an error caused by the above drop position adjustment in the stop position of the lead-in lever 30 and the drop position adjustment lever 31 when they are selectively brought into contact with the three cams 129a, 129b, 129c corresponding to the record sizes of cm and 30 cm. Does not occur at all. Therefore, highly accurate drop adjustment can be performed in exactly the same way for each record size. Furthermore, since the adjustment cam 79 is mounted on the lead-in lever 30 that is separated from the tone arm 5, there is no need to hold down the tone arm 5 each time to prevent it from moving when adjusting the drop position. , the above-mentioned drop position adjustment can be easily performed.

[Record size selector]

In this record player system, the size selector cam 127 is rotated and adjusted by the size select knob 14 as described above, and the three cams 129a, 12 are brought into contact with the pin 69 of the lead-in lever 30 during the lead-in operation described above.
Select 9b, 129c, thereby 17cm, 25
The drop position of the tone arm 5 is selected to suit each record size of cm and 30 cm.

On the other hand, this record player system is configured so that the height of the tone arm 5 can be adjusted.

However, with this record player system,
As described above, the tone arm drive device 2 performs lead-in and return control of the tone arm 5 using a mechanism that rotates around the axis _P1 of the arm rotation shaft 6.
When adjusting the height of the tone arm 5, as shown in FIG. While maintaining the relationship and the height relationship with the arm lifter 12 constant, the size selector cam 127 is attached to a fulcrum shaft 128 fixed to the main body frame 1,
Since this size selector cam 127 is fixed at a fixed position so as not to be affected by the above-mentioned height adjustment, the distance dimension of the size selector cam 127 from the center of the turntable 2 as shown in FIG. L ₃ can always be fixed accurately without being affected by the above height adjustment. Therefore, the distance _L4 between the drop position of the tone arm 5 and the center of the turntable 2 can always be accurately determined according to each record size, and by adjusting the height of the tone arm 5,
There is no variation in the drop position, and the drop position can always be set accurately. If there is a deviation in the distance dimension _L4 , it is only due to the inclination of the pin 69 of the lead-in lever 30, but this is due to the difference between the brake drum 32 and the axis _P1 of the arm rotation shaft 6 in FIG. pin 93 and lead-in lever 3
There is no problem if the ratio of the rotation radii R ₁ and R ₂ of the zero pin 69, R ₁ /R ₂ , is set large.

[Continuous start and reject operations]

19 and 20 show a modification of the setting mechanism for the return limiter 44. In this case, the setting pin 145 of the return limiter 44 is connected to the position detection switch SW1.
It is located corresponding to 2. Note 14
Reference numeral 1 denotes the setting pin, which in this case is placed with safety in mind, but is not particularly necessary.

According to the record player system configured in this way, when the control cam 29 is rotated clockwise in the clockwise direction in FIG. 19 as described above to perform the lead-in operation of the tone arm 5, the lead-in operation of the tone arm 5 is performed. After the in is completed and just before the down is started, the return limiter 44 comes into contact with the setting pin 145 and is set to the above-mentioned return state.

That is, when the control cam 29 rotates forward and its protrusion 43 turns on the position detection switch SW12 as described above, the lead-in of the tone arm 5 is completed, but at this time the return limiter 44
The setting pin 1 is set by the pin driving portion 44a.
45, is relatively pushed by the setting pin 145, is rotated counterclockwise about the fulcrum shaft 45, and is set to the above-mentioned return state. At this time, by utilizing the rotation locus of the setting pin 145 relative to the pin driving section 44a, after the setting described above, the setting pin 145 slips inside the pin driving section 44a (to the right in FIG. 20) and returns. The limiter 44 is moved clockwise in FIG. 19 while in its set state.

However, with this record player system,
As mentioned above, after turning on the start switch SW1, immediately turn on the redirect switch SW.
2 is turned on, the position detection switch SW12 of the control cam 29 is turned on, and the moment the lead-in completion of the tone arm 5 is detected, the motor 8 is reversely rotated, and the control cam 29 is
The system is controlled to rotate counterclockwise in the figure.

Therefore, when the above-described switch operation is performed, after the lead-in of the tone arm 5 is completed and immediately before the start of down, the pin drive section of the return limiter 44, which has already been set to the return state, is activated due to the reverse rotation of the control cam 29. 44a drives the pin 93 of the brake drum 32 counterclockwise in FIG. 19, and the tone arm 5 is returned as described above.

In short, if the above switch operation is performed, the tone arm 5 will be returned immediately after the lead-in is completed without being brought down.

However, a major reason for performing such a switch operation is when you forget to place the record R on the turntable 2 and realize this. Accidents such as the No. 10 needle 10a accidentally coming into contact with the turntable 2 and causing injury can be prevented, and safety is extremely high.

The present invention is provided with a driving device for a tone arm which is driven by a motor as described above, and which leads the tone arm in and down in the forward motion and raises and returns the tone arm in the backward motion. The tone arm driving device is provided with a return limiter that substantially engages with the tone arm during the backward movement to return the tone arm, and the return limiter is provided to return the tone arm during the forward movement of the tone arm driving device. After the lead-in is completed and immediately before the start of the down operation, the return limiter is switched from a reset state in which it does not substantially engage with the tone arm to a set state in which it substantially engages with the tone arm. detecting the position of the tone arm of the tone arm driving device in the forward motion immediately before the start of the down motion of the tone arm of the tone arm driving device when the redirect operation is performed immediately after the start operation is performed with the switching mechanism;
The tone arm driving device is further provided with a position detection switch that causes the tone arm driving device to be operated in a backward motion by the motor. With this configuration, if the restart operation is performed immediately after the tone arm lead-in operation is started by performing the start operation, the reset operation will be performed immediately after the tone arm lead-in is completed and immediately before the down operation begins. The return limiter can be switched from the reset state to the set state, and following the switching, the tone arm can be returned using the return limiter immediately before the tone arm starts to move down. Therefore, when the above operation is performed, the tone arm drive device allows the return operation to be performed continuously after the lead-in is completed, skipping the down mode, so it is possible to reset without lowering the tone arm. . As a result, it is possible to prevent an extremely serious accident in which the stylus of the tone arm cartridge accidentally comes into contact with a turntable on which a record is not placed, resulting in significant damage to the stylus. Its safety is extremely high. In addition, the tone arm's redirect operation time is extremely short, making it extremely easy to operate.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Fig. 1 is an overall plan view, Fig. 2 is a sectional view taken along the line shown in Fig. 1, Fig. 3 is an exploded perspective view of the tone arm drive unit, Fig. 4 is a partially cutaway plan view of the control cam, and Fig. 4 is a partially cutaway plan view of the control cam. Figure 5 is a sectional view taken along lines from Figure 4, Figure 6 is a sectional view taken from Figure 2, and Figure 7 is a sectional view taken from Figure 2.
Line sectional view, Fig. 8 is a line sectional view of Fig. 2- Line sectional view, Fig. 9
The figure is a cross-sectional view taken along the line in FIG. 8, FIG. 10 is a cross-sectional view taken along the line shown in FIG. 2, FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. Plan view showing the positional relationship between the control cam and the position detection switch, Figure 13A~
Fig. 13I is a sectional view of the control cam portion to explain the control operation of the tone arm, and Fig. 14 is a main part to explain the movement of the lead-in lever during auto-down operation after manual lead-in of the tone arm. 15 is a sectional view of the main parts to explain the height adjustment of the tone arm, Fig. 16 is a plan view of the main parts to explain the drop position adjustment of the tone arm, and Fig. 17 is a sectional view of the main parts to explain the tone arm drop position adjustment. A sectional view of the main parts to explain the positional relationship between the size selector cam and the tone arm drive device, Fig. 18 is a plan view of the same as above, and Fig. 19 is a main part showing a modification of the return limiter setting mechanism. cross-sectional view, second
FIG. 0 is a sectional view taken along the line of FIG. 19. Further, in the symbols used in the drawings, 5... tone arm, 8... motor, 25... tone arm drive device, 29... control cam, 44...
...Return limiter, 93...Pin that rotates together with the tone arm, 145...Set pin constituting an example of a switching mechanism for switching the return limiter from the reset state to the set state, SW12...Position detection switch It is.

Claims (1)

[Claims] 1. A tone arm drive device is provided which is driven by a motor and leads the tone arm in and down in a forward motion, and raises and returns the tone arm in a backward motion. A return limiter is provided which substantially engages with the tone arm during the backward movement to return the tone arm, and when the tone arm driving device is in the forward movement, after the lead-in of the tone arm is completed, a return limiter is provided. A return limiter switching mechanism configured to switch the return limiter from a reset state in which it does not substantially engage with the tone arm to a set state in which it substantially engages with the tone arm immediately before the start of operation;
When a redirect operation is performed immediately after a start operation, the tone arm driving device detects the position immediately before the start of the down movement of the tone arm of the tone arm driving device, which is in the forward movement, and causes the motor to drive the tone arm. A record player system equipped with a position detection switch that operates the device in a double motion.