JPH04339321A - Pickup moving device - Google Patents

Abstract

PURPOSE:To move a common pickup over both faces of a disk and to realize the guiding of a wire and the continuous stringing of the wire from its pulley to a guiderail in simple construction. CONSTITUTION:By driving a motor 36, a wire 44 is continuously driven along an arc guiding position guided by the circumferential surface of a pulley 41 from a linear guiding position along a guiderail 14 or 15. A moving member 20 whose intermediate line is fixed to the wire 44 moves from the guiderail 14 to the guiderail 15 while being drawn by the wire 44.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup moving device for reading recorded information on both surfaces of a disc such as a record, such as a so-called vertical linear tracking double-sided record player.

0002

[Prior Art] Conventionally, cartridges are provided individually for one side of a record, the so-called A side, and the other side, the B side, so that it is possible to play both sides of the record while the record is still attached. It is configured so that it is possible.

[0003] Furthermore, a cartridge that contacts one surface of a record disc is attached to a lid that defines a record storage space.

0004

[Problems to be Solved by the Invention] In such prior art, a cartridge having a precise structure is assembled into two cartridges as described above.
The configuration is therefore complicated.

Furthermore, since the cartridge is attached to the lid, the lid opening/closing device has a complicated structure in order to ensure that undesired external forces are not applied to the cartridge and smooth performance can be performed. ing. Therefore, the prior art is
Inferior to cost reduction.

[0006] An object of the present invention is to simplify the structure and reduce the cost, and to provide a structure in which the peripheral surface of the pulley is used directly as a means for stretching a traction member at a position bridging a pair of linear guide means. By doing so, it is possible to realize the direct guidance of the traction member at the arc-shaped guide position and the continuous stretching of the traction member from the arc-shaped guide position to the linear guide position with a simple configuration. It is an object of the present invention to provide a pickup moving device that can smoothly move over both sides of a disk.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention includes a moving member supporting a pickup, and a movable member that supports a pickup, and a movable member that supports a pickup so that the pickup can move in the radial direction of the disk along both surfaces of the disk. a pair of linear guide means parallel to each other for guiding the moving member; a linear traction member fixed to the moving member midway along the track; a driving means for driving the traction member; and a pair of linear guide means for driving the traction member. It is arranged in the middle near one end so that its central axis is parallel to the plane of the disk, and its rotation plane is parallel to the guiding direction of the linear guide means, and its diameter is set so that it is parallel to the pair of straight lines. The fixed portions of the traction member and the movable member are arranged at approximately the same position in the linear guiding position by the respective shaped guide means, and includes a pulley for guiding the traction member on its circumferential surface; Traction member tensioning means forming a loop arranged at a linear guiding position by the linear guiding means and an arc-shaped guiding position guided by the peripheral surface of the pulley and connecting the ends of the linear guiding position. By driving the pulling member with the driving means, the moving member can be moved from one linear guide member to the other linear guide member.

[0008]

[Operation] When the drive means is driven, the traction member is driven from the linear guide position along the linear guide means to the circular guide position guided by the circumferential surface of the pulley. It moves from one linear guide means to the other linear guide means while being pulled by the member. Therefore, the pickup can be moved over both surfaces of the disk.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a horizontal sectional view thereof. A record disc 1 is fixed to a record disc receiving part 3 erected on a turntable 2 by being pressed by a pressure bonding member 4 with a spring force.

FIG. 3 is an enlarged sectional view of the record disc receiving portion 3 and the pressure bonding member 4. The outer diameters of the record receiving part 3 and the pressure bonding member 4 are such that the cartridge 5 can be attached to the record receiving part when the playing needle 6 of the cartridge 5 reaches the innermost groove in the radial direction of the record 1 after playing a record. It is formed small so as not to abut against the portion 3 and the crimp member 4. This record receiving part 3 and the pressure bonding member 4
Although it is desirable that the outer diameters of the outer diameters are as large as possible in order to hold the record 1 so that it does not vibrate during playback, as described above, the outer diameters are selected within a range that does not abut the cartridge 5 when the record is finished playing.

An endless belt 7 is attached to the turntable 2.
is wrapped around. This belt 7 is wound around a pulley 9 fixed to a motor 8. In this way, the motor 8 drives the turntable 2 and the record disc 1 to rotate around the horizontal axis. Instead of the drive method using the belt 7, a direct drive method may be used in which a motor is connected to the turntable 2, or a rim drive method may be used in which the output shaft of the motor is pressed against the periphery of the turntable to rotate the turntable 2. There may be. The cover 10 is attached to the main body 11 on the right side in FIGS. 1 and 2 so as to be openable and closable around a vertical axis. A record disc 1 can be placed and stored on a record disc receiving member 12 provided inside the cover 10. The crimp piece 60 is interposed between the crimp member 4 and the cover 10.

In order to run the cartridge 5 and play both sides of the record 1, a cartridge running device 13 according to the invention is provided. A guide rail 14 for playing one surface of the record 1, for example the A side, and a guide rail 15 for playing the other surface of the record 1, for example the B side, are the guide rails 14 for playing the other surface of the record 1, for example the B side. It is parallel to both surfaces and is supported by a chassis 16 above the record 1. Guide rail 14
, 15 (linear guide means) are connected by a semicircular guide rail 17 surrounding the periphery of the record disc 1. The cartridge 5 is fixed to the free end of the arm 18, and the proximal end of the arm 18 is fixed to the moving member 20 shown in FIG.

The moving member 20 includes gripping pieces 22, 23 that grip the guide rails 14, 15, 17 on both sides of the cartridge 5 in the moving direction 21, and these guide rails 14,
Sliding contact pieces 24 and 25 that come into sliding contact with the lower portions of the base members 15 and 17 are formed on the base body 50. The gripping pieces 22 and 23 have bent portions 22a.
, 23a, respectively. This moving member 20 has a moving direction 21 of grip pieces 22, 23 and sliding contact pieces 24, 25.
The guide member 27 is connected by the connecting piece 26 to an intermediate position along the
is fixed. The guide member 27 is connected to the guide rails 14,1
The upper and lower parts of 5 and 17 are partially surrounded by bent parts 27a and 27b, and the overall shape is formed into a C-shape. A fixing piece 28 is fixed to the guide member 27 .

Referring again to FIGS. 1 and 2, chassis 16 is provided with intermeshed gears 29 and 30. As shown in FIGS. A gear 31 is fixed to the gear 29 at the same time. A gear 32 meshes with this gear 31. A worm wheel 33 is coaxially fixed to the gear 32. Worm wheel 33 meshes with wheel 34. A pulley 35 is fixed to the worm 34. The chassis 16 has a motor 36 (
drive means) is fixed. A belt 38 is connected to the pulley 37 fixed to the output shaft of the motor 36 and the above-mentioned pulley 35.
is wrapped around it, and power is transmitted through this. A winding drum 39 is fixed to the gear 29. A pulley 41 is supported by a support member 40 at the center of the curvature of the guide rail 17 . A cable 44 is wound around the winding drum 39, a guiding pulley 41, and pulleys 42, 43 under tension by a spring 45. The cable 44 passes through the fixed piece 28 of the moving member 20 shown in FIG. 4 and is fixed to this fixed piece 28.

Here, the winding drum 39, pulley 41,
42, 43, spring 45, etc. constitute a traction member stretching means.

A light shielding plate 46 is fixed coaxially to the gear 30, and a plurality of light passing holes 47 are formed in the light shielding plate 46 at intervals in the circumferential direction. This light passage hole 47 is detected by a light detection means 48 fixed to the chassis 16. Therefore, the amount of movement of the cable 44 is detected, and the moving member 2
0 and the position of the cartridge 5 can be detected. A processing device (not shown) controls the motor 36 based on the output from the detection means 48 .

The motor 36 is rotatable in forward and reverse directions, and thereby the movable member 20 is moved along the guide rails 14, 15, 17 in the aforementioned moving direction 21.

FIG. 5 is a plan view of the vicinity of the pulley 41, and FIG. 6 is a front view of the vicinity of the pulley 41. Moving member 20
FIG.
In the state (1), the movement of the guide member 27 with respect to the guide rail 14 is suppressed. This state is also shown in FIG. 6(1). The guide member 27 prevents displacement in the vertical direction in FIG. 5 and also prevents angular displacement with respect to the guide rail 14. In addition, together with the guide member 27, the gripping pieces 22, 23 and the sliding pieces 24, 25 prevent displacement in the vertical direction in FIG. 6, as well as angular displacement in the state shown in FIG. Maintains orientation with high precision.

The moving member 20 is an arc-shaped guide rail 17
The state reached is shown in FIG. 5(2) and FIG. 6(2). The fixed piece 28 moves along the outer periphery of the pulley 41. At this time, the guide rail 17 is located closer to the base body 50 between the gripping pieces 22 and 23 and the sliding pieces 24 and 25. This allows the fixed piece 28 to move smoothly around the outer periphery of the pulley 41. At this time, the gripping piece 22,
23 and sliding pieces 24, 25 from the guide rail, and by moving the fixed piece 28, which is another guide means, along the outer periphery of the pulley 41, the gripping pieces 22, 23 contribute to maintaining the posture of the pickup. and sliding piece 24
, 25 are configured so that their accuracy does not deteriorate due to wear caused by contact with the guide rail 17. This makes it possible to quickly move the movable member 20 on the arc-shaped guide rail 17 that does not require particularly high precision.Moreover, such quick movement of the movable member 20 allows for highly accurate posture maintenance. This prevents any adverse effects such as rattling on the moving member 20 on the required linear guide rails 15, 14. Note that the state when the moving member 20 moves on the guide rail 15 is as follows:
The situation is similar to that when moving 4.

When the movable member 20 is moved along the guide rails 14, 15, and 17 by the motor 36, the playback needle 6 of the cartridge 5 is separated from the record 1. This prevents the record 1 and the reproduction needle 6 from being damaged. During playback, the playback needle 6 of the cartridge 5 comes into contact with the top of the record 1. In order to make it possible to play the record 1 as described above, it is constructed as follows.

FIG. 7 is a rear view of the vicinity of the chassis 16.
FIG. 8 is a sectional view seen from the right side of FIG. A portion 14a of the guide rail 14 is supported by support shafts 51 and 52 so as to be angularly displaceable around an axis parallel to the direction in which the guide rail 14 extends (left-right direction in FIG. 7). Guide rail part 1
One end of the guide rail 4 a is supported by the remaining portion 14 b of the guide rail 14 by a support shaft 52 . Further, the other end of this guide rail portion 14a is connected to the chassis 16 by a support shaft 51.
Supported by The guide rail portion 14a has a support shaft 51,
It has a protruding piece 53 that protrudes further toward the cartridge 5 than 52. A guide member 54 is fixed to the chassis 16. A spring 55 is interposed between the guide member 54 and the protruding piece 53. As a result, the guide rail portion 14a is attached to the support shaft 5.
1 and 52 in the counterclockwise direction in FIG. 8, thereby allowing the needle 6 of the cartridge 5 to come into contact with the surface of the record 1. The pusher 56 that comes into contact with the protruding piece 53 is supported by a guide member 54 so as to be able to move toward and away from the protruding piece 53 . A contact portion 58 of a lever 57 can come into contact with the pusher 56 . One end of a spring 59 is connected to this lever 57 . The other end of the spring 59 is connected to the chassis 16. As a result, the spring 59 causes the contact portion 58 of the lever 57 to push the pusher 56,
The guide rail portion 14a can be angularly displaced by pushing downward in FIG. 7 against the spring force of the spring 55. spring 59
When the contact portion 58 of the lever 57 presses the pusher 56 by the spring force of the spring 59, the spring force of the pusher 56 is
is selected to be sufficient to angularly displace guide rail portion 14a against the spring force of spring 55 as described above. The lever 57 is supported by the chassis 16 by a support shaft 60 so as to be angularly displaceable around an axis perpendicular to the support shafts 51 and 52 . An electromagnetic plunger 61 is connected to the lever 57, and the lever 57 is driven by this.

When playing side A of the record 1, the movable member 20 is held by the guide rail portion 14a. In this state, the electromagnetic plunger 61 is excited. As a result, the lever 57 is angularly displaced around the support shaft 60 in the clockwise direction in FIG. 7 against the spring force of the spring 59. As a result, the guide rail portion 14a is angularly displaced in the counterclockwise direction in FIG. 8 around the support shafts 51 and 52 by the spring force of the spring 55. Therefore, the reproduction needle 6 of the cartridge 5 is
surface can be touched.

After the performance of side A of the record 1 is completed, the electromagnetic plunger 61 is demagnetized. Therefore spring 5
The contact portion 58 of the lever 57 pushes the pusher 56 downward in FIG. 7 against the spring force of the spring 55. As a result, the guide rail portion 14a
is angularly displaced counterclockwise in FIG. 8 around the axis of . In this way, the playback needle 6 separates from side A of the record 1.

One end of the other guide rail 15 is supported by the support member 40 by the support shaft 62, and the other guide rail 15 is
It is supported by the chassis 16 by two support shafts 63 . In this way, the guide rail 15 can be angularly displaced around the axes of the support shafts 62 and 63. The axes of the support shafts 62 and 63 are parallel to the turntable 2. The guide rail 15 has
It has a protruding piece 64 that protrudes toward the cartridge 5 side with respect to the support shafts 62 and 63. The protruding piece 64 is biased by a spring 65 in a direction in which the playback needle 6 of the cartridge 5 comes into contact with the record disc 1 . A pusher 66 that can come into contact with the protruding piece 64 is guided by a guide member 67. pusher 6
6 comes into contact with the contact portion 69 of the lever 68. lever 68
The contact portion 69 is biased by the spring 70 in a direction in which the pusher 66 is displaced against the spring force of the spring 65. The lever 68 is supported by the chassis 16 by a support shaft 71. The axis of the support shaft 71 is perpendicular to the axes of the support shafts 62 and 63. Lever 68 is connected to electromagnetic pusher 72.

For playing the B side of the record disc 1, the electromagnetic plunger 72 is energized for playing the record while the movable member 20 is held by the guide rail 15. The lever 68 resists the spring force of the spring 70 and moves to the support shaft 71.
angular displacement in the clockwise direction in FIG. As a result, the guide rail 15 is moved to the support shaft 6 by the spring force of the spring 65.
The reproducing needle 6 of the cartridge 5 can come into contact with the B side of the record 1 by being angularly displaced around the axes 2 and 63.

After the record performance ends, the electromagnetic plunger 72 is demagnetized. Therefore, the spring 70
is angularly displaced around the axis of the support shaft 71 in the counterclockwise direction in FIG. Therefore, the contact portion 69 of the lever 68 is
6 is displaced upward in FIG. 7 against the spring force of the spring 65. Therefore, the pusher 66 presses the protruding piece 64 upward in FIG. The guide rail 15 is angularly displaced clockwise in FIG. 8 around the axes of the support shafts 62 and 63. In this way, the playback needle 6 separates from the B side of the record 1. The spring force of the spring 70 is such that when the electromagnetic plunger 72 is demagnetized, the contact portion 69 of the lever 68 presses the pusher 66 as described above against the spring force of the spring 65, and the guide rail 15 is moved. The value is selected to be large enough to allow angular displacement around the axes of the support shafts 62 and 63.

The spring forces of the springs 55, 59, 65, and 70 are configured so that an appropriate stylus pressure is applied when the playback stylus 6 comes into contact with the record 1. Also, the pusher 56,
66 is equipped with a damper for absorbing impact force, thereby preventing the reproducing needle 6 from impactfully contacting the record 1, allowing smooth performance.

FIG. 9 is a block diagram of the electrical circuit. The main body 11 includes an A-side button 81 and a B-side button 82 that are operated to play side A and B of the record 1.
will be provided. The main body 11 is also provided with a performance button 83 that is operated to start a performance. Signals from these buttons 81 to 83 are input to a processing circuit 84 implemented by a microcomputer or the like. The electromagnetic solenoids 61 and 72 and the motors 8 and 36 are
It is controlled by signals from processing circuit 84. Assume that side A of the record 1 on the cover 10 side is to be played. At this time, the A-side button 81 is operated. As a result, when the cartridge 5 and the moving member 20 are on the guide rail 15, the motor 36 is first driven. Therefore, the moving member 20 reaches the guide rail portion 14a of the guide rail 14 via the guide rail 17, and the playback needle 6 reaches a position corresponding to the outermost sound groove of the record 1 in the radial direction. While the moving member 20 is moving, the electromagnetic solenoids 61 and 72 remain demagnetized, and the playback needle 6 does not come into contact with the record 1 or the like. A side button 81
Prior to the operation, the movable member 20 moves to the guide rail portion 1.
4a, when the reproducing needle 6 is at a position corresponding to the outermost sound groove in the radial direction of the record 1, the motor 36 is not driven.

When the play button 83 is operated, the processing circuit 84 first drives the motor 8. As a result, the turntable 2 and the record 1 are rotated. After the record 1 reaches a steady speed, the electromagnetic solenoid 61 is energized. As a result, the playback needle 6 comes into contact with the record 1, and the performance begins. As the performance progresses, the moving member 20 moves along the sound groove of the record 1.
is moved radially inward.

When the reproduction needle 6 reaches the radially innermost tone groove of the record 1 and the performance ends, the electromagnetic solenoid 61 is demagnetized and the motor 8 is demagnetized.

After the playback needle 6 leaves the record 1, the motor 36 is driven, thereby moving the moving member 20 radially outward of the record 1 along the guide rail portion 14a. When the playback needle 6 reaches a position corresponding to the radially innermost sound groove of the record 1, the motor 36 is demagnetized and enters a standby state.

When the performance button 83 is operated again, the performance of side A is started.

[0033] Also, in order to play the B side, press the B side button 82.
When is operated, the motor 36 is driven, and the movable member 20 moves from the guide rail 14 to the guide rail 15 via the guide rail 17, and reaches the position shown by the imaginary line 85 in FIG. At this time, the playback needle 6 is at a position corresponding to the radially innermost sound groove of the record 1. When the movable member 20 is in the position shown by the imaginary line 85, the performance button 83 is pressed.
The motor 8 is driven by the operation. Therefore, the turntable 2 and the record 1 rotate. After reaching a steady speed, the electromagnetic solenoid 72 is energized, and the playback needle 6 comes into contact with the B side of the record 1. The performance is performed in this way. The subsequent operation is similar to the performance operation for side A.

The present invention can be widely implemented not only for playing vinyl records 1, but also for reading other discs.

As described above, according to the embodiment of the present invention, since the cartridge can be moved along both surfaces of a disc such as a record, playback such as automatic performance can be performed on the disc. This can be done using a common cartridge for both surfaces.

Furthermore, since the circumferential surface of the pulley 41 is directly used as a means for extending the cable 44 at a position bridging the linear guide rail, the cable 44 at the pulley 41 portion is
It is possible to realize the guidance of the cable 44 and the continuous stretching of the cable 44 from the circular guide position to the linear guide position with a simple configuration.

Furthermore, since the fixed piece 28 is moved along the outer periphery of the pulley 41 on the arc-shaped guide rail, it can be moved stably and quickly on the arc-shaped guide rail 17. can be realized.

[0038]

As described above, according to the present invention, since the pickup can be moved along both surfaces of the disc, playback such as automatic performance can be performed using a common method across both surfaces of the disc. This can be done using a pickup.

Furthermore, since the circumferential surface of the pulley is directly used as a means for stretching the traction member at a position bridging the pair of linear guide means, the traction member can be guided at the circular guide position and the traction member can be Continuous stretching from a circular guide position to a linear guide position can be performed smoothly and reliably with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a cutaway sectional view of an embodiment of the present invention seen from the front.

FIG. 2 is a horizontal cross-sectional view of the embodiment shown in FIG. 1;

FIG. 3 is an enlarged sectional view of the vicinity of the turntable 2.

FIG. 4 is a perspective view of the moving member 20.

FIG. 5 is a plan view of the vicinity of the pulley 41.

FIG. 6 is a front view of the vicinity of the pulley 41.

FIG. 7 is a rear view of the chassis 15 and its vicinity.

8 is a sectional view of the vicinity of the chassis 16 seen from the right in FIG. 2;

FIG. 9 is a block diagram of an electric circuit.

[Explanation of symbols]

1. Vinyl record 2 Turntable 3 Cartridge 6 Recycled needle 14 Straight guide rail 15 Straight guide rail 17　Semicircular arc guide rail 20 Moving member 30 Wrapping drum 41 Pulley 42 Pulley 43 Pulley

Claims (1)

[Claims] Claim 1: A moving member supporting a pickup;
A pair of linear guide means parallel to each other guide the moving member so that the pickup can move in the radial direction of the disk along both surfaces of the disk, and a linear guide means fixed to the moving member along the track. a traction member, a drive means for driving the traction member, and a pair of linear guide means located intermediately near one end of the pair of linear guide means, the center axis of which is parallel to the plane of the disk, and the plane of rotation of which is parallel to the plane of the disk; The means is arranged so as to be parallel to the guiding direction of the means, and its diameter is approximately equal to the distance between the fixed portions of the pulling member and the movable member at the linear guiding positions of the pair of linear guiding means. , comprising a pulley that guides the traction member with its circumferential surface, and the traction member is provided with at least a linear guide position by each of the linear guide means, and an end portion of the pulley guided by the circumferential surface of the pulley. and a traction member extending means forming a loop arranged at circular arc-shaped guide positions, and by driving the traction member with the driving means, the movable member is guided in one linear direction. A pickup moving device characterized in that it is movable from one member to another linear guide member.