JPS6122361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a record player system including:
In particular, the present invention relates to a tone arm drive device in a one-motor type record player system.

As is well known, in a one-motor type record player system, the motor also drives the turntable shaft, and a center gear provided on the turntable shaft rotates a drive gear provided on one side of the turntable shaft. The rotation of the gear drives the automatic mechanism and controls the tone arm.

However, in the most common structure of conventional devices of this type, the rotation center of the automatic mechanism is provided at a position different from the axis of the horizontal rotation axis of the tone arm. In such a structure, the rotation center of the auto mechanism is offset from the swing angle center of the tone arm, so when the tone arm is driven in and back, the auto mechanism's lead-in driving member and return Mechanical misalignment, loss, etc. occur between the driving member and the tone arm, making it difficult to lead in and return the tone arm smoothly.

The present invention was invented to correct the above-mentioned defects, and includes a center gear provided on a turntable shaft driven by a motor, and a drive that is intermittently rotationally driven by the center gear. a gear, a reciprocating member that is reciprocally driven by the rotation of the drive gear, and a control cam that rotates about the horizontal rotation axis of the tone arm and is driven by the reciprocating member to rotate in forward and reverse directions through a gear mechanism. a lead-in drive member that is rotated by the control cam about the horizontal rotation axis; a lead-in drive member that is supported by the control cam; and a lead-in drive member that rotates integrally with the tone arm. a brake drum provided, a brake member provided so as to be able to come into contact with the brake drum, an arm lifter driving cam formed on the control cam, and an arm that is controlled to ascend and descend by the arm lifter driving cam. and a lifter, and after the tone arm is lead-in by rotating the lead-in driving member by rotating the control cam in one direction and rotating the brake drum, the arm lifter is driven. The control cam is configured to lower the tone arm, and the tone arm is raised by the arm lifter drive cam as the control cam rotates in the other direction.
The record player system is configured to return the tone arm using the return drive member.

According to the record player system configured in this way, all of the lead-in drive member, return drive member control cam, and brake drum that constitute the automatic mechanism that controls the tone arm can be accurately rotated around the center of the swing angle of the tone arm. It can be driven dynamically. Moreover, all the lead-in, return, up, and down controls of the tone arm are controlled by one control cam, and the reciprocating motion is driven by the rotation of the drive gear, driving the control cam forward and backward through a gear mechanism. The member can smoothly drive its control cam without any mechanical deviation or loss.

An embodiment of a fully automatic record player system to which the present invention is applied will be described below with reference to the drawings.
Note that this record player system has a one-motor structure.

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 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 has a vertical rotating shaft 6.
As is conventionally known, it is attached to the upper end of the arm so that it can rotate freely in the vertical direction around a horizontal rotation axis, and the arm rotation axis 6 is rotatably attached to the bearing block 7 fixed on the main body frame 1. It is being A cartridge 10 is attached to the tip of the tone arm 5 via a head shell 9, and a counterweight 11 is attached to the other end. Further, an arm lifter 12 for raising and lowering the tone arm 5 is attached to the bearing block 7,
An armrest 13 of the tone arm 5 is mounted on the main body frame 1.

In addition, the operation section provided on the main body frame 1 has three size select switches SW1 and SW that also serve as a start switch and are used to select the size of the record (R) of 17 cm, 25 cm, and 30 cm.
2, SW3, a rigid switch SW4, and a repeat switch SW5 are arranged, for example, in a horizontal line. And these switches SW1~
SW5 is configured as a feather touch type switch. Note that SW6 is a push-pull type power switch. In addition, each of the above switch SW
1 to SW6 each have a display light emitting diode D.
1 to D6 are attached.

Regarding the above switch configuration, it is also possible to configure the switches SW1 to SW3 as switches exclusively for size selection, and to make the switch SW4 serve both as a start switch and a redirect switch.

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 8 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 driving device 25 is attached to the lower end outer periphery 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.
6 is inserted and fixed with screws 27. A mechanical yarn 28 is horizontally fixed to the lower end of the bush 26 by crimping or the like. On the other hand, a step 26a is provided at the upper end of the bush 26, and a control cam 29 is rotatably attached to the outer periphery of the step 26a. A lead inver 30 is arranged below the control cam 29, and this lead inver 3
0 is rotatably attached to the outer periphery of the lower end of the bush 26. Also this lead inver 3
A drop position adjustment lever 31 of the tone arm 5 is arranged below the lead-in bar 30, and the drop position adjustment lever 31 is rotatably attached to the outer periphery of the boss 30a of the lead inver 30. Therefore, the control cam 29, lead inverter 30, and drop position adjustment lever 31 are connected to the arm rotation shaft 6.
The structure is such that it rotates around the same axis as the axis _P1 . Further, a brake drum 32 is disposed below the mechanical yarn 28, and this brake drum 3
2 is fixed to the lower end of the arm rotating shaft 6 with a screw. A shutter plate 33 is disposed below the brake drum 32, and the 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 control cam 29 is constructed of a disc body as shown in FIGS. 3, 4, 6, and 7. The lever control cam 20 is configured to be reciprocated within an angle of approximately 130 degrees. A pinion 37 is provided outside the boss 29a of the control cam 29. Note that this pinion 37 is configured as a spur gear with a width corresponding to the amount of height adjustment of the tone arm 5. Further, on a part of the horizontal upper surface 29b of the control cam 29, an arm lifter driving cam 38 is provided in an arc shape along the circumference thereof. 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.
Further, a cam forming wall 42 is provided on the lower surface 29c of the control cam 29 and extends substantially along the circumferential surface. 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 39c, and approximately 90 degrees from the third cam surface 39a. The angle up to the end of the surface 39c is approximately 115 degrees. Further, the limiter cam 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 has the second cam surface 39
It is located approximately 130° from the beginning of point b. 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.

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.

As shown in FIGS. 2 and 3, the arm lifter 12 has a vertical lifter shaft 60 and a horizontal arcuate shape attached to the upper end of the lifter shaft 60. arm part 61 for supporting the tone arm, and lifter shaft 60.
It is composed of a compression spring 62 that always urges the spring downward.

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 projected downward from the main body frame 1 through insertion. In this state, the lifter shaft 60 is configured to be movable in the vertical direction. The control cam 29 is placed on the arm lifter cam 38 at the lower end of the lifter shaft 60. The compression spring 62 is connected to the lifter shaft 6.
The lifter shaft 60 is always pressed downwardly by the arm lifter cam 38 through a ring 66 inserted into the outer periphery of the lower end of the lifter shaft 60 and fitted to the lower end of the lifter shaft 60. There is.

Further, as shown in FIGS. 3 and 8, the lead-in lever 20 has one end 30b extending outwardly below the control cam 29. A pin 69 is provided at one end 30b. Note that this pin 69 extends both above and below the lead-in lever 90. 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 rotated as shown in FIG. It is rotated clockwise. A cam floor pin 73 is provided at one end of the lead-in limiter 70, and a protrusion 74 provided at the other end is configured to abut against a stopper 75 provided by the lead-in lever 30. ing. The lead-in limiter 70 is inserted into the cam forming wall 42 of the control cam 29 by its pin 73, as shown in FIG. It is pressed inside the cam-forming wall 42 by the force.

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 adjusting camshaft 82 is inserted into the insertion hole 81 from above, and the adjusting cam 79 is fixed to the lower end of the adjusting camshaft 82. A screwdriver insertion hole 83 is provided in the head 82a of the adjustment camshaft 82, and a relatively strong anti-rotation spring such as a disc spring 84 is interposed between the head 82a and the support portion 80. has been done.
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 lead-in lever 3
The arm rotation shaft 6 is fitted into the boss 30a of the
The drop position adjustment lever 31 is configured to be rotatable around the axis _P1 of the lead-in lever 3.
By the tension spring 85 spanned between 0 and 0,
The lead-in lever 30 is biased to rotate counterclockwise in FIG. A protrusion 8 provided at the tip of the drop position adjustment lever 31
6 is pressed against the eccentric cam surface 79a of the adjustment cam 79 by the spring force of the ledger spring 35. A pair of stoppers 86a and 86b are provided at the one end 30b to prevent the adjustment cam 79 from being rotated unnecessarily large, and the adjustment cam 79 is moved to the stopper by a projection 87 provided on the adjustment cam 79. It is brought into contact with 86a and 86b. The adjustment camshaft 82 is configured to be positioned 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 adjusting camshaft 88 can be removed from the hole 88.
By inserting a screwdriver or the like into the driver insertion hole 83, the adjustment camshaft 82 can be rotated and adjusted. Reference numeral 89 denotes an arm drive surface provided on the lead-in lever ₃₁ for horizontally driving the tone arm 5. It is configured in a plane parallel to the radiation P ₂ .

Further, the brake drum 32 is shown in FIGS. 3 and 1.
As shown in FIG. 0, the braking surface 92 is approximately fan-shaped, and the braking surface 92 provided on the outer periphery thereof is configured as a concentric circular surface centered on the axis _P1 of the arm rotation shaft 6. . And this brake drum 9
A pin 98 is implanted on 2. Note that this pin 93 is constructed integrally with the arm rotation shaft 6 via the brake drum 92. This pin 93 passes through an arc-shaped elongated hole 94 provided in the mechanical chassis 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 driven in lead-in and returned by the lead-in lever 30 and the return limiter 44.

As mentioned above, by adjusting the rotation of the adjustment cam 79 with a screwdriver, the relative angle between the lead-in lever 30 and the drop position adjustment lever ₃₁ is adjusted by the cooperative action of the eccentric cam 79a and the tension spring 83. (see Fig. 8) is the axis P ₁ of the arm rotation shaft 6.
The tone arm The drop position with respect to the record R of No. 5 can be adjusted.

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 arm rotation 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 9.
The adjustment screw 100 is screwed into a horizontal screw hole 90 provided in the shutter plate 33, 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 angle of the shutter plate 33 with respect to the brake drum 32 can be adjusted through cooperation with the tension spring 98.

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.
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 28, and the light receiving element 105 is attached to the holder 107.
It is attached to a printed circuit board 108 screwed to the lower end of the board.

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, at this time, the light emitted from the light emitting element 104 passes through the hole 95 to the light receiving element 1.
05, 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 indicated by the dashed line in Fig. 1,
In FIG. 10, the record end detection end face 96 of the shutter plate 33 is moved below the light emitting element 104 as shown by the chain line, and the light is irradiated onto the light emitting 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 element 10
The light receiving area of the tone arm 5 is rapidly increased, and based on this, a signal is output from the light receiving element 105, and the record end position of the tone arm 5 is 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
The fulcrum shaft 1 provided on the mechanical chassis 28 at 0a
11, and is rotatably supported by the mechanical chassis 2.
8 and is rotated counterclockwise in FIG. 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 so as to be able to press against and separate from the brake action surface 92 . Further, a cam follower pin 116 is provided at the upper part of the brake lever 110 in the longitudinal direction 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 119 is arranged at the lower end of the rotation locus of the pin 69 of the lead-in lever 30. This stopper plate 119 has one end 119a connected to a fulcrum shaft 11 provided under the mechanical chassis 28.
0, and is rotatably supported on the mechanical chassis 28.
It is biased to rotate counterclockwise in FIG. 10 by a tension spring 121 suspended between the two. An electromagnetic magnet 122 is disposed opposite to the outside of this stopper plate 119. This electromagnetic magnet 122 is attached to a magnet attaching portion 123 that is bent into a part of the mechanical chassis 28. Therefore, when the electromagnetic magnet 122 is deenergized (non-energized state), the stopper plate 119 is connected to the tension spring 121 as shown in FIG.
The spring force causes the stopper plate 119 to come into contact with the stopper 124 provided on the mechanical chassis 28, but in this state, the stopper plate 119 has escaped to the inside of the rotation locus of the pin 69 of the lead-in lever 30. Become.

Next, a control cam drive device 150 for rotating the control cam 29 of the tone arm drive device 25 forward or backward at a rotation angle of approximately 130 degrees is shown in FIGS. 6, 12, and 13. explain.

First, as described above, the turntable shaft 3, which is rotationally driven by the motor 4, is rotatably attached to the main body frame 1, and the turntable 2 is placed on the upper end thereof. A center gear 151 is attached to the turntable shaft 4 at the bottom of the main body frame 1.
is provided. A drive gear 152 is arranged on one side of this center gear 151.
This drive gear 152 is rotatably attached to a gear shaft 153 attached to the lower part of the main body frame 1. However, this drive gear 1
A gear to be engaged with the center gear 151 is formed on the outer periphery of the drive gear 152, and the gear is connected by a pair of missing teeth 154 and 155 formed at an angle of 180 degrees on the outer periphery of the drive gear 152. It is divided into two parts: a lead-in gear 156 and a lead-in gear 157. At the top of this drive gear 152 is a pair of sub gear links 15.
8,159 are provided. Both sub-gear links 158 and 159 are approximately L-shaped, are arranged symmetrically about the gear shaft 153, and are rotatable on the upper surface 152a of the drive gear 152 via a pair of fulcrum shafts 160 and 161. is supported by. And these two sub gears 158,1
59 is a tension spring 162 suspended between these
6, and their positions are regulated by abutment against a pair of stoppers 163 and 164 provided on the drive gear 152. In this state, the tips 158a of both sub gear links 158, 159,
A pair of sub gears 165 provided in 159a,
166 is opposed to both the toothless portions 154 and 155.

The sub gear links 158 and 159 constitute a so-called clutch for engaging the drive gear 152 with the center gear 151, and this clutch includes a rotary pawl provided on the center gear 151 and a drive gear. It is also possible to use a conventionally known pawl clutch using a pawl lever provided on the gear 152.

A starting lever 167 is provided for selectively rotating both sub-links 158 and 159 at the time of starting and redirecting. The activation lever 167 is rotatably supported on the lower surface of the main body frame 1 via a fulcrum shaft 168, and is supported by a tension spring 169 spanned between one end 167a of the activation lever 167 and the main body frame 1. In Figure 6, it is rotated counterclockwise. The starting lever 167 is regulated in position by coming into contact with a stopper 169' provided on the lower surface of the main body frame 1. One end 167 of this activation lever 167
An electromagnetic magnet 170 is arranged opposite to a. Note that this electromagnetic magnet 170 is attached to the lower surface of the main body frame 1.

On the other hand, a pair of positioning recesses 171, 17 is provided on a peripheral wall 152b provided on the lower side of both gears 156, 157 in the drive gear 152.
2 is provided. These two recesses 171, 17
2 is provided at an angle of 180 degrees, and is arranged at an angle of 90 degrees with respect to both the missing tooth portions 154 and 155. Further, an endless cam 173 consisting of a concave groove is formed on the lower surface 152c of the drive gear 152. And this endless cam 173 is 180
It is virtually divided into two parts at an angle of .degree., one of which constitutes a lead-in cam 174 and the other constitutes a lead-in cam 175. The lead-in cam 174 and the return cam 175 are distributed to the left and right with respect to the straight line connecting the centers of the toothless parts 154 and 155, and the lead-in gear 156 and the return gear 157 are connected to each other. In contrast, they exhibit mutually opposite phase states.

177 is driven by the drive gear 152 and the control cam 29
This is a slider to drive the rotation. This slider 177 has a pair of long holes 17 provided therein.
8 is engaged with a pair of guide pins 179 provided on the lower surface of the main body frame 1, and is attached so as to be reciprocated linearly in the longitudinal direction thereof. One end 177a of this slider 177
A cam follower pin 180 provided above is engaged in the endless cam 173. A rack 181 is formed on one side of the other end 177b of the lever slider 177, and this rack 181 is engaged with the pinion 37 of the control cam 29. Furthermore, this slider 17
A switch driving protrusion 182 is provided on a part of the switch 7 . Further, 183 is a gear stopper, which is rotatably supported on the lower surface via a fulcrum shaft 184, and is rotated counterclockwise in FIG. It is rotationally energized. The gear stopper 183 is pressed against the peripheral wall 152b of the drive gear 151 with its tip 183a, and selectively engages with both the recesses 171 and 172 to position the drive gear 152 at a rotation angle of 180 degrees. It is configured.

Next, Figures 3, 6, 14A to 14C
The size selector 126 will be explained with reference to FIGS.

First, 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 127 is rotatably supported on a fulcrum shaft 128 provided on the mechanical chassis 28. Additionally, this size selector cam 127 has three select cams 12 for essentially selecting record sizes of 17 cm, 25 cm, and 30 cm.
9a, 129b, and 129c are provided. Note that these three select cams 129a, 129b,
129c is formed into three concentric circular surfaces centered on the fulcrum shaft 128.

The size selector cam 127 is electrically rotated by an electromagnetic drive device 131.

First, the size selector cam 127 has a lever shape, and the three select cams 129a to 129c are provided at one end 127a. A magnet 1, which is an example of a ferromagnetic material, is attached to the other end 127b of this size selector cam 128.
32 is installed. A coil support plate 133 bent into a substantially U-shape is arranged so as to straddle the horizontal rotation locus of the magnet 132. The coil support plate 133 is fixed onto the mechanical chassis 28, and a coil 134 is wound around the coil support plate 133 in a flat shape. At this time, the coil 134 has a horizontal shape,
And it is arranged close to the magnet 132.

In addition, the coil support plate 133 and the mechanical chassis 28
is made of a sheet metal member, etc., and constitutes a so-called core and yoke, and a closed magnetic path is formed around the magnet 132. Further, the size selector cam 127 has the other end 127
b and the spring receiver 13 provided on the mechanical chassis 28
14A, by means of a tension spring 136 which is bridged between 5 and 5.

However, according to the electromagnetic drive device 131, the size selector 126 can be switched between three states: energizing the coil 134 in one direction, energizing the coil 134 in the opposite direction, and de-energizing the coil 134. The size selector cam 127 can be switched to three positions shown in FIGS. 14B, 14C, and 14A, respectively.

That is, in a non-energized state where the coil 134 is not energized, the size selector cam 127
is pulled by a tension spring 136 and positioned in the state shown in FIG. 14A. And in this state 25
The cm select cam 129b is positioned on the rotation locus of the pin 69, and preparations for selecting the drop position of the tone arm 5 to a position corresponding to the 25 cm record size are completed.

In addition, the coil 134 may be connected to the arrow A in FIG. 14B, for example.
When a current is passed in one direction shown by , the interaction between the current and the magnetic flux generated from the magnet 132 causes a force to act on the magnet 132 in the direction of arrow a in FIGS. 14B and 15, for example. As a result, the size selector cam 127 is rotated clockwise about the fulcrum shaft 128 against the tension spring 136 as shown in FIG. 14B, and the size selector cam 127 for 17cm
c is positioned on the rotation locus of the pin 69, and preparations for selecting the drop position of the tone arm 5 to a position corresponding to a record size of 17 cm are completed.

In addition, the coil 134 is connected to the arrow B in FIG. 14C, for example.
When a current flows in the opposite direction shown by , the interaction between the current and the magnetic flux generated from the magnet 132 causes a force to act on the magnet 132, for example in the direction of arrow b in FIGS. 14C and 15. As a result, the size selector cam 127 is rotated counterclockwise about the fulcrum shaft 128 against the tension spring 136 as shown in FIG. 14C, and the size selector cam 127 for 30cm
9a is positioned on the rotation locus of the pin 69, and preparations for selecting the drop position of the tone arm 5 to a position corresponding to a record size of 30 cm are completed.

However, the size selector cam 12 as described above
Switching between the three states No. 7 is electrically performed by the three size select switches SW1 to SW3. In other words, size select switch SW1 for 17cm
is turned on, the coil 134 moves as shown by the arrow A.
When power is applied in the direction and size select switch SW2 for 25cm is turned on, coil 13
4 is not energized and size Serena switch SW3 for 30cm is turned on, coil 134 is turned on.
The structure is such that current is applied in the direction of the arrow B.

The electromagnetic drive device 131 is composed of, for example, an air-core coil and an iron core inserted into the air-core coil so as to be able to reciprocate freely, and the air-core coil can be energized in one direction or the opposite direction, and can be in a non-energized state. By switching between the three states, it is also possible to adopt a device that moves the iron core to three positions relative to the air-core coil in the same way as described above. At this time, the magnet 132 or the iron core may be fixed and the coil 134 or the air-core coil may be moved.

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

In addition, as shown in FIG. 6, the slider 1
A pair of position detection switches SW1 are located at both ends of the reciprocating locus of the switch drive protrusion 182 of 77.
1 and SW12 are arranged. Note that both of these switches SW11 and SW12 are constituted by micro switches and are mounted on the mechanical chassis 28. And this is the switch SW11,
The projection 128 is configured to press and drive the push buttons SW11' and SW12' of the SW12. Also, the tip 110 of the brake lever 110
A protrusion 143 for driving a switch is bent downward from one side of b. And this protrusion 1
A mutating switch SW14 is attached to the lower part of the mechanical chassis 28 opposite to the mechanical chassis 43. Furthermore, this muting switch SW14
is composed of a micro switch, and is configured as a normally closed switch so that it is turned on when the push button SW14' is not pressed, and turned off when the push button SW14' is pressed. .

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

[Stop state]

First, in the stop state, the tone arm 5 is in the first position.
It has been returned to the armrest 13 as shown by the solid line in the figure. Further, the control cam drive device 150 and the tone arm drive device 25 are returned to the states shown in FIGS. 6 to 13.

However, in this stopped state, the lifter shaft 80 of the arm lifter 12 is pushed up onto the horizontal cam surface 38a of the arm lifter cam 38 as shown in FIG. 6, 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). However, it is assumed that the power switch SW6 is turned on in advance.

Next, each control operation of the tone arm 5 will be explained. First, in this recording player system, the center gear 151 intermittently drives the drive gear 152 by half a rotation, thereby moving the slider 177 to a predetermined stroke L ₁ (sixth
(see figure) for linear forward or backward movement. And the linear movement of the slider 177 is easy 181
The control cam 29 is driven to rotate forward or backward at a rotation angle of approximately 130 degrees. The tone arm 5 is controlled to lead-in and down based on the forward rotational movement of the control cam 29, and the tonearm 5 is controlled up and back based on the reverse rotational movement. At this time, of the approximately 130° rotation angle of the control cam 29, the first
The area within the rotation angle of 90 degrees is configured as a lead-in and return control section, and the remaining rotation angle of approximately 40 degrees is configured as a down and up control section.

First, let's look at Figure 1, Figure 6, Figure 16A, and Figure 1.
Each operation of the control cam drive device 150 will be explained with reference to FIG. 6B and FIG. 17.

[Start operation]

When any one of the size select switches SW1 to SW3 is turned on, the motor 4 moves the turntable shaft 3 in the direction indicated by the arrow C in FIGS. 1 and 6.
The turntable 2 is rotated in the same direction. At the same time, the coil 134 of the size selector 126 is energized (or de-energized) as described above, and the size selector cam 1
27 can be selectively switched to the three states described above.

Meanwhile, at the same time, the electromagnet 170 is energized (energized), and the starting lever 167 is electromagnetically attracted to the electromagnetic magnet 170 as shown in FIG. 16A.
69 in the clockwise direction. Then, this activation lever 167 kicks the other end 158b of one sub gear link 158 with its tip 167b. As a result, the sub gear link 158 is rotated counterclockwise on the drive gear 152 against the tension spring 162 around the fulcrum shaft 160 as shown by the solid line in FIG. It is engaged with a center gear 151 that is rotated by shaft 4 . As a result, at that moment, the torque of center gear 151 is transmitted to drive gear 152 via sub-gear link 158 having sub-gear 165, and drive gear 152 starts rotating in the direction of arrow D in FIG. 16A. As the drive gear 152 starts to rotate, the tip 183a of the gear stopper 183 is pushed up from inside the recess 171 onto the peripheral wall 152b of the drive gear 152 against the tension spring 185. Thereafter, the drive gear 152 is rotated in the direction of arrow D with the tip 783a being pressed onto the peripheral wall 152b. On the other hand, when the drive gear 152 is slightly rotated in the direction of arrow D [an angle of 1/2 of the width of the missing teeth of the missing teeth portions 154 and 155], the lead-in gear 156 is engaged with the center gear 151. The drive gear 152 moves in the direction of arrow D due to gear drive.
rotationally driven in the direction. In addition, both gears 156,1
At a predetermined time when 51 is engaged, the electromagnetic magnet 1
70 is again deenergized (de-energized state), and the starting lever 167 is rotated counterclockwise by the tension spring 169 as shown by the chain line in FIG. 16A, and the stopper 1
It is returned to its original state where it was brought into contact with 69'.

However, as shown in Fig. 16B, the drive gear 15
1, the endless cam 173 integrated therewith is also rotated in the same direction. The lead-in cam 174 of the endless cam 173 moves the slider 177 through the pin 180 to the sixteenth position.
It is moved in the direction of the arrow in figure B. This result is easy 1
At 81, the pinion 37 is rotated, and the control cam 29 is rotated forward in the direction of arrow F in FIG.

At this time, the pin 180 is the lead-in cam 17.
4, it is moved at a constant speed in the direction of arrow F. Therefore, the slider 177 is also moved in the same direction at a constant speed, and the control cam 29 is rotated forward in the direction of arrow F at a constant speed.

When the drive gear 152 completes the rotation of 180 degrees, the lead-in gear 156 is detached from the center gear 151 as shown in FIG.
The rotation of the drive gear 152 is cut off, and the drive gear 152 is stopped. At this point, both missing tooth parts 154 and 1
55 is reversed, and the toothless portion 155 is now opposed to the center gear 151. At the same time, the tip 183a of the gear stopper 183 is engaged in the recess 172, and the drive gear 15
2 is repositioned at its stop position.

When the drive gear 152 completes the above-mentioned 180° rotation, the phase of the endless cam 173 is also reversed as shown in FIG.
7 is stopped from moving in the direction of arrow F. At this point, the control cam 29 completes a forward rotation of approximately 180 degrees and is stopped at the position shown in FIG. 17. At this point, the switch driving protrusion 182 of the slider 177 pushes the push button SW12' of the position detection switch SW12, turning on the switch SW12.

[Stop state]

This stop operation is performed in the middle of playing a record, and is started in the state shown in FIG. 17. When the rigid switch SW4 is turned on, the electromagnet 170 is energized in the same manner as described above, and the activation lever 167 is rotated clockwise as shown by the chain line in FIG. At this time, the starting lever 167 rotates the other sub gear link 159 counterclockwise as shown by the chain line in FIG.
is engaged with the center gear 151. As a result, the drive gear 152 starts rotating in the same manner as described above, and at the same time, the return gear 157 is now driven by the center gear 151, and the drive gear 152 is rotationally driven in the direction of arrow D. Then, the return cam 175 of the endless cam 173 connects the slider 177 via the pin 280.
is moved at a constant speed in the direction of arrow G in Fig. 17,
The control cam 29 is reversely rotated at a constant speed in the direction of arrow H in FIG. 17.

When the drive gear 152 completes the above-mentioned 180° rotation, the lead-in gear 156 is removed from the center gear 151 as shown in FIG. be done.

When the drive gear 152 completes the 180° rotation, the endless cam 173 and the slider 177 are returned to their original positions as shown in FIG. At this point, the control cam 29 completes reverse rotation of approximately 180 degrees and is stopped in its original state, and the switch driving protrusion 182 pushes the push button SW11' of the position detection switch SW11 to turn on the switch SW11. .

Next, Figure 6, Figure 7, Figure 8, Figure 10, Figure 1
Each operation of the tone arm driving device will be explained with reference to FIGS. 8A to 18H and FIG. 19.

[Start operation]

As mentioned above, there are three size select switches.
When any one of SW1 to SW3 is turned on, the control cam drive device 150 drives the control cam 29 to rotate in the direction of arrow F in FIG. 7 at a rotation angle of about 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. The inlever 30 is also rotated in the direction of arrow F. The drop position adjustment lever 31 is also rotated in the direction of arrow F 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. 18A. Push pin 93 in the direction of arrow F. As a result, the clockwise rotational 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 portion 61 of the arm lifter 12 The lead-in is then horizontally rotated in the direction of arrow I in FIG. 1.

Further, when the control cam 29 is rotated approximately 15 degrees in the normal direction, the pin 116 of the brake lever 110 passes through the slope 39c of the brake/mutating cam 39 and reaches the second cam surface 39, as shown in FIG. 18A.
fall into b. As a result, the brake lever 110 is rotated counterclockwise by the tension spring 112 as shown in FIG.
is pressed against the brake action surface 92 of. Therefore, the brake is applied to the tone arm 5 almost simultaneously with the start of lead-in of the tone arm 5, and the tone arm 5
is led in on the arm portion 61 of the arm lifter 12 at a constant speed 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
The pin 69 shown in Figure 8B is connected to the three select cams 12 of the size selector cam 127 at its upper end.
Among 9a, 129b, 129c, record R
It comes into contact with one of the cams set in advance according to the size of the cam. Then, at the moment of this contact, the rotation of the lead-in lever 30 is stopped, and the tone arm 5, which was being driven by the lead-in lever 30, also moves toward the record R shown by the two-dot chain line in FIG.
It is stopped at the upper position, and at this point the tone arm 5
The lead-in is completed. 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. 18B.
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 cam floor 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 11 by the spring force of the tension spring 72. Therefore, as the cam 41 reaches the rear in the rotational direction of the control cam 29, its single diameter (r ₅ ) increases.
Since a smooth slope is formed such that the cam 41 gradually increases, the moment the pin 73 is pressed against the cam 41, the cam action between the cam 41 and the pin 73 causes the cam to move counterclockwise in FIG. 18B. Acts on the lead-in limiter 70. And that force remains the same as lead-in 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. 18B. In FIG. 18B, 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 reaches the slope 39f of the brake drum/mutating cam 39 and rides on the third cam surface 39c, as shown in FIG. 18C. As a result, brake lever 1
10 is rotated clockwise against the tension spring 112 as shown in FIG. 18C, and the brake shoe 11
5 is separated from the braking 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 driving cam 38 also rotates, and the lifter shaft 60 of the arm lifter 12 is rotated by the cam 3.
It is relatively slid on the horizontal cam surface 38a of No. 8.
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 3.
8a reaches the end on the slope 38b side.

When the control cam 29 is rotated approximately 90 degrees in the normal direction, the lead-in of the tone arm 5 is completed, and the subsequent control cam 2
The tone arm 5 is lowered by the continued forward rotation of the tone arm 9.

At this time, first, when the control cam 29 is rotated approximately 115 degrees in the normal direction following the above-mentioned procedure, the lifter shaft 60 is rotated by the cam 38 due to the cooperative action of the arm lifter driving cam 38 and the compression spring 61 of the lifter shaft 60. The arm lifter 12 is moved down by relatively sliding down the slope 38b and onto the upper surface 29b of the control cam 29. However, by the downward movement of the arm lifter 12, the tone arm 5 placed on the arm portion 61 is moved down, and the needle 10a of the cartridge 10 is 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 brake lever 110 pin 116 reaches the slope of the brake drum/mutating cam 39 and rides on the fourth cam surface 39d, as shown in FIG. 18D. As a result, the brake lever 110 is further rotated clockwise in FIG. 18D against the tension spring 112, and its projection 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 position detection switch SW12 is turned on as described above. As a result, completion of lead-in of the tone arm 5 is detected.

Immediately before the above, the return limiter 44 is brought into contact with the set pin 141 by its pin driving portion 44a, and is relatively pushed by the set pin 141, as shown in FIG. is rotated counterclockwise. As a result, the limiter 44 is automatically set to the return state from being able to drive the pin 93 of the brake drum 32 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 one recess 47a and is engaged with the other recess 47b, so that the limiter 44 is fixed again in the set state.

The return limiter 44 is brought into contact with the setting pin 14, so that the rotation of the control cam 29 is stopped.

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

[Stop operation]

As mentioned above, when the rigid switch SW4 is turned on while playing a record, the control cam 2 is activated by the control cam drive device 150.
9 is reversely driven in the direction of arrow J at a rotation angle of approximately 130° in FIG. 18D.

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. 18E.
fall on c. As a result, the brake lever 110
is rotated counterclockwise in FIG. 18E by the tension spring 112, and its protrusion 143 separates from the push button SW14' of the mutating switch SW14. Then, the muting switch SW14 is turned on, and from this moment on, muting is applied.

As the control cam 29 rotates in the opposite direction, the arm lifter drive cam 38 also rotates, and when the control cam 29 is reversely rotated by approximately 35 degrees, the lifter shaft 60 moves the slope 38b of the lifter cam 38 relative to the arm lifter drive cam 38. The arm lifter 1 slides up onto the horizontal cam surface 38a of the cam 38.
A second up operation is performed. However, due to the raising operation of the arm lifter 12, the arm portion 61 raises the tone arm 5, 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.

Note that when the control cam 29 is rotated approximately 40 degrees in the normal direction, the raising of the tone arm 5 is completed, and by the subsequent reverse rotation of the control cam 29, the return of the tone arm 5 is performed.

At this time, first, 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, as shown in FIG. 18F. It falls to 39b. As a result, the brake lever 110 is moved to the first position by the tension spring 112.
The brake shoe 115 is rotated counterclockwise as shown in FIG. 3G, and the brake shoe 115 is pressed against the brake application surface 92 of the brake drum 32 by the force of the tension spring 112. Therefore, from this moment on, the brake drum 32
The brake of the tone arm 5 is applied via.

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. Push 93 in the direction of arrow J. As a result, a rotational force is applied to the tone arm 5 in the direction of arrow J via the pin 93, the brake drum 32, and the arm rotation shaft 6, and the tone arm 5 is moved onto the arm portion 61 of the arm lifter 12 as shown in FIG. It is horizontally rotated in the direction of arrow K 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 cam floor pin 73 of the lead-in limiter 70, and eventually these are further brought into contact as shown by the chain line in FIG. 18G. Thereafter, by the continued reverse rotation of the control cam 29, the lead-in lever return cam 41 moves the lead-in lever 30 in the direction of arrow J in FIG. 18G via the lead-in limiter 70, as shown by the solid line in FIG. 18G. Push the lead-in lever 30 and the drop position adjustment lever 31 together with the control cam 29 toward the arrow J.
rotated in the direction.

When the control cam 29 is reversely rotated by approximately 115 degrees, the return of the tone arm 5 is completed and the armrest 13 is returned 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. 18H, the return limiter 44 is pushed in the opposite direction by the pin 93 that has been pushed so far and 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.

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. 18H.
Climb onto a. As a result, the brake lever 110
is rotated clockwise against the tension spring 112 as shown in FIG. 18H, 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.

Finally, when the control cam 29 is reversely rotated by 130 degrees, the position detection switch is activated as described above.
SW11 is turned 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. 18H, 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. 18H, and as shown in FIG. The state will be restored. At about the same time, one of the pin drive parts 44a of the return limiter 44 came into contact with the drop position adjustment lever 31, the rotation of the control cam 29 was stopped, and the position detection switch SW11 was turned on. Then, the motor 4 is stopped, and the turntable 2 is also stopped.

However, with the above series of return operations,
A series of return operations of the tone arm 5 will be completed.

[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 control cam 29 is driven to reverse rotation in the direction of arrow J in FIG. 18D by the control drive device 150. As a result, the tone arm 5 is automatically returned in exactly the same manner as the stop operation described above.

[Repeat operation]

After turning on any size select switch SW1 to SW3, turn on the repeat switch.
When SW5 is turned on, the start mode is memorized in the system control circuit, and after the stop operation described above, the start operation described above is performed repeatedly.

[Animal Lead-in Operation] In this record player system, when the tone arm 5 is returned to the armrest 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 any of the size select switches SW1 to SW3 is turned on, the control cam drive device 150 moves the control cam 29 approximately in the direction of arrow F in FIG. When the tone arm 5 is rotated forward by 115 degrees, 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 any of the size select switches SW1 to SW3 is turned on, the system control circuit causes the electromagnetic magnet 122 to be energized (energized). do.

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. 19 to the position indicated by the solid line. As a result, the pin 69 of the lead-in lever 30, which has been rotated together with the control cam 29 in the direction of arrow F in FIG. 19, 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. There is no need to change the size, and there is also a size selection switch.
Auto-down operation of the tone arm 5 is performed by simply performing a single operation of turning on any one of SW1 to SW4.

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

[Reject by manual operation]

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

However, during this manual redirect operation, 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 control cam drive device 150 Control cam 2
9 is reversely rotated approximately 130 degrees in the direction of the arrow in FIG. 18D, and the control cam drive device 150 and tone arm drive device 26 are automatically reset.
The system is controlled so that the system returns to a state where the next lead-in operation can be performed. However, at this time, the tone arm 5 is automatically raised, similar to the above-described stop operation.

That is, when the tone arm 5 is manually returned to the armrest position while playing a record, the control cam drive device 150 and the tone arm drive device 25 are 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 disc R will not fall onto the turntable 2.
It does not cause any damage and is extremely safe. Moreover, in this case, as mentioned above, armrest 1
Since mutating is working on the tone arm 5 on the tone arm 3, the cartridge 10 can be replaced without having to turn down 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.

[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 brake drum 32 that is attached and operates integrally with the tone arm 5 and the main body frame 1.
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 this automatic mechanism performs lead-in and return control of the tone arm 5. Since the rotation center of the mechanism and the swing angle center 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 is always moved smoothly. can be controlled accurately and precisely. 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 the reliability is very high.

However, since we have adopted a mechanism that converts the rotational movement of the drive gear 152 of the control cam drive device 150 into direct movement of the rack 181, and converts the linear movement of the rack into the rotational movement of the control cam 29 via the pinion 37, The rotational speed of the control cam 29 can always be kept constant. Therefore, the tone arm 5 whose lead-in and return are controlled by the control cam 29,
The lead-in and return speeds are always constant. Furthermore, by appropriately varying the diameter, number of teeth, etc. of the pinion 37 relative to the rack 181, the rotational speed, etc. of the control cam 29 can be easily varied to a desired value, which is very advantageous in terms of design.

Furthermore, the control cam drive device 150 adopts a structure in which the rotational motion of the drive gear 152 is converted into linear motion of the slider 177 using the lead-in cam 174 and the return cam 175 of the endless cam 173. These lead-in cams 174 and return cams 17
By appropriately changing the configuration of the tone arm 5, the forward and reverse rotation speeds of the control cam 29 can be changed, and the lean-in speed and return speed of the tone arm 5 can also be changed as appropriate.

[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. 20, by loosening the height adjustment screw 20, the arm rotation shaft 6 can be moved up and down with the sleeve 17 relative to the bearing block 7, and thereby the tone arm 5 height adjustments can be made. After adjusting the height, the height adjustment screw 20 is tightened again to fix the sleeve 17 against the bearing block 7, and to position the sleeve 17 and the arm rotation shaft 6 at a predetermined position.

However, with this record player system,
Since the tone arm drive device 25 is attached to the sleeve 17 which moves up and down together 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 of 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, by the above-mentioned height adjustment,
For example, fluctuations such as drop position deviation of the tone arm 5 relative to the record R are less likely to occur, and the tone arm 5 can always be driven accurately.

In this player system, the pinion 37 of the control cam 29 of the tone arm drive device 25 is configured as a wide spur gear.
7, the control cam drive device 150 is slid against the rack 181 of the slider 177, so that the height adjustment described above 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. 20, when the height of the tone arm 5 is adjusted, the control cam 29 is moved up and down together with the arm rotation shaft 6, and the arm lifter 12 is always moved in accordance with the control cam 29. The vertical movement is also 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, the control cam 29 that controls the lead-in and return of the tone arm 5 is provided with an arm lifter driving cam 38, and the cam 38 is configured to control the arm lifter 12 up and down. The timing of the lead-in and return operations and the down and up operations is very easy to set, and there is hardly any deviation between the lead-in and return operations, and the tone arm 5 can always be controlled extremely accurately in a predetermined timing mode.

[Size selector]

In this record player system, as mentioned above, the coil 13 is
4 and a ferromagnetic magnet 132 is electrically operated, and this electromagnetic drive device 131 moves the size selector cam 127 to the position corresponding to each record size of 17 cm, 25 cm, and 30 cm. Since the drop position of the tone arm 5 is mechanically switched to select the drop position corresponding to each record size, although it is an inexpensive mechanical mechanism, it can be operated electrically using a feather touch type operation switch. It is possible to perform switching operations, and the operability is very good.

As described above, the present invention makes it possible to accurately rotate all of the lead-in drive member, return drive member control cam, and brake drum that constitute the automatic mechanism that controls the tone arm around the center of the swing angle of the tone arm. Because I can,
When driving the tone arm lead-in and return,
No mechanical deviation or loss occurs between the lead-in drive member, the return drive member, and the tone arm, and the rotation of the tone arm can always be controlled smoothly and accurately. Moreover, since all of the lead-in, return, up, and down controls of the tonearm are controlled by one control cam, there is a timing difference when controlling the tonearm's down after the tonearm's lead-in and the return after the tonearm's up. does not occur at all,
This tone arm control can always be performed reliably and with accurate timing. In addition, the reciprocating member that is reciprocated by the rotation of the drive gear and drives the control cam in forward and reverse rotation through a gear mechanism can smoothly drive the control cam without any mechanical deviation or loss. As a result, there is no mechanical shift or loss in the drive system of the control cam, and the control cam can be driven in forward and reverse rotation very quickly based on start and stop switch operations, and smoothly without any rattling. You can. Therefore, the responsiveness of the lead-in and return operations of the tone arm to the start and stop switch operations is extremely fast, and quick lead-in and return operations can always be performed extremely smoothly. Furthermore, the structure in which the automatic mechanism consisting of the lead-in drive member, return drive member, control cam, and brake drum is attached to the outer periphery of the horizontal rotation axis of the tone arm makes it easier to achieve accuracy during assembly, and also prevents errors in accuracy after assembly. It is difficult to generate, and has excellent reliability and durability.

[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. 5 is a partially cutaway plan view of the control cam. is a cross-sectional view along the line in FIG. 4, FIG. 6 is a cross-sectional view along the line in FIG. 2, FIG. 7 is a cross-sectional view along the line in FIG. Figure 8 - Line sectional view, Figure 10 is Figure 2 -
11 is a sectional view taken along the line XI-XI of FIG. 10, FIG. 12 is a sectional view taken along the line XII-XII of FIG.
Figure 4C is a plan view showing the three switching states of the size selector, and Figure 15 is Figure 14A.
Image sectional views, Figures 16A, 16B, and 17 are plan views showing the operating state of the control cam drive unit and the relationship with the tone arm drive unit, and Figures 18A to 18H are the tone arm. FIG. 19 is a cross-sectional view of the control cam portion to explain the operation of the drive device portion; FIG. 19 is a plan view of the main part to explain the movement of the lead-in lever during auto-down operation after manual lead-in of the tone arm;
FIG. 20 is a sectional view of the main parts for explaining height adjustment of the tone arm. In addition, in the symbols used in the drawings, 3...Turntable axis, 4...Motor, 5...Tone arm, 6...Arm rotation axis which is a horizontal rotation axis, 1...
2... Arm lifter, 29... Control cam, 30... Lead-in lever constituting one of the lead-in drive members, 31... Drop position adjustment lever constituting another lead-in drive member, 32... ... Brake drum, 38 ... Arm lifter drive cam, 44 ... Return limiter which is a lead-out drive member, 110 ... Brake lever which is a brake member, 151 ... Center gear, 152 ... Drive gear, 17
7...Slider which is a reciprocating member, 37...Pinion which is one gear of a gear mechanism, 181...
This is the rack, which is another gear in the gear mechanism.

Claims (1)

[Scope of Claims] 1. A center gear provided on a turntable shaft driven by a motor, a drive gear intermittently rotationally driven by the center gear,
a reciprocating member that is reciprocally driven by the rotation of the drive gear; a control cam that is rotated about the horizontal rotation axis of the tone arm and driven to rotate forward and backward by the reciprocating member via a gear mechanism; A lead-in drive member rotated by the control cam about a horizontal rotation axis, a return drive member supported by the control cam, and a brake provided to rotate integrally with the tone arm. A drum, a brake member provided so as to be able to come into contact with the brake drum, an arm lifter driving cam formed on the control cam, and an arm lifter whose elevation is controlled by the arm lifter driving cam. The lead-in drive member is rotated by the rotation of one of the control cams, and the tone arm is lead-in by rotating the brake drum, and then the arm lifter driving cam is used to drive the tone arm. The tone arm is configured to lower the arm, and after the arm lifter drive cam raises the lead-in by rotating the control cam in the other direction, the tone arm is returned by the return drive member. Configured record player system.