JPS5837601B2 - Automatic lifting device for tone arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic raising and lowering device for a tone arm, and in particular, when the height of the tone arm is adjusted, the height of the arm lifter is also adjusted in the same stroke. The present invention relates to an automatic lifting/lowering device for a tone arm, which constantly maintains the positional relationship between the tone arm and the arm lifter to a pre-adjustment state and smoothly raises/lowers the tone arm Q.

In most conventional players, the tone arm and arm lifter are separately mounted on a mounting board to which a turntable or the like is attached, and the height of the tone arm is adjusted when the cartridge is replaced or the like.

This height adjustment is available on almost all conventional players.
The structure allows for easy tightening and loosening of screws, etc.

In addition, when adjusting the height of the tone arm in this way, if the effective vertical recording angle of the record and the vertical tracking angle of the stylus do not match, cross-modulation distortion will occur in the cartridge output, so in order to avoid this, it is necessary to It is absolutely necessary.

However, in order to adjust the height of the tone arm in the conventional player described above, it is inevitably necessary to adjust the height of the arm lifter.

This is to make the stroke and timing of the stylus placement operation on the record surface the same as the state before the height adjustment of the tone arm. Problems arise in that the stylus remains floating in the air or the stylus is not placed on the record surface.

However, setting such strokes and the like correctly is a difficult task even for enthusiasts, and there is a risk of rotating the tone arm during the process, possibly damaging the cartridge or stylus.

In contrast, there is a tone arm height adjustment device in which the arm lifter is fixed to the tone arm, and the arm lifter is raised and lowered together with the height adjustment of the tone arm, thereby omitting the height adjustment of the arm lifter alone. It was proposed by the applicant of the present application and published as Utility Model Application No. 103904/1983.

However, this conventional configuration has the disadvantage that it cannot be applied to a fully automatic player that automatically raises and lowers the arm lifter or rotates the tone arm.

This is because, regardless of whether the arm lifter is raised or lowered by adjusting the height of the tone arm, the automatic operation member that drives the arm lifter must be related to the arm lifter or tone arm in the same way as before adjustment. It is.

The present invention provides an automatic lifting/lowering device for a tone arm that is particularly easy to apply to such an auto player.

Further, the present invention provides an automatic lifting/lowering device for a tone arm that is extremely simple in construction, reliable in movement, and low in cost.

Embodiments of the present invention will be specifically described below with reference to the drawings.

1 and 2 are a plan view showing the main parts of the present invention and a front view with a part of the main parts cut away. 1 is a board of the player, and 2 is a board attached to the upper part of the board 10. In the arm pace, through holes 3 and 4 are provided at the center of the arm pace 2 and at a portion corresponding to this center, and these Q through holes 3 and 4 have a support that supports the support shaft 6 of the tone arm 5. A collar 7 is inserted through the tone arm 5, and the support collar 7 is held at an appropriate height of the tone arm 5 by a set screw 8 screwed from the side of the arm base 2.

Further, this support collar I rotatably supports the support shaft 6 with extremely low resistance, and for this purpose, the support shaft 6 is supported by the support collar 7 through a well-known bearing. It has become.

Reference numeral 9 denotes a pivot for holding the base mounting member 10 of the tone arm 50 in a manner that it can be raised and lowered via a jewel bearing, and, as is well known, the sensitivity of its raising and lowering can be adjusted.

11 is a counterweight, 12 is a cartridge shell,
13 is a cartridge attached to the cartridge shell 12, 14 is a stylus attached to the cartridge 13, and 15 is a finger.

Further, a turntable 16 driven by a motor is rotatably installed on the substrate 1 below the tone arm 5.

During performance, the record 18 is placed on the turntable 16 via a seat 17.

On the other hand, two upper and lower stoppers 19 and 20 are protruded from the body of the support collar 7, so that when the height of the support collar 7 is adjusted by loosening the set screw 8, the arm base 2 and the base plate 1 This prevents the support collar 7 from unnecessarily peeling off.

A connecting rod 21 is horizontally attached to the upper part of the support collar T, and a supporting collar 23 that supports a lifting rod 22 constituting an arm lifter is attached to the other end of the connecting rod 21.

The lower end of this support collar 23 penetrates the substrate 1 and extends below it, and the lower end of the lifting rod 22 protrudes below the support collar 23. and the lower end surface of the support collar 23,
A spring 25 is interposed to urge the lifting rod 22 downward.

Also, below the support collar I, the support shaft 6
A rotating force plate 27 is mounted on the center shaft 26 connected to the
is attached to the lower surface of the rotating force plate 27, and a sushi strain support 28 is attached with screws 29.

As shown in Figs. 3 and 4, the rotating force plate 2 has a fan-like shape as a whole, and a notch 30 is provided around the expanded portion of the rotating force plate 2, which continues to the slope 29, and a notch 30 is provided on the lower surface of the expanded portion. A relatively long protrusion 31 is integrally provided.

The lower end of the lifting rod 22 is placed within the notch 30.

32 is a drive motor that serves as a drive source for controlling the rotation of the tone arm 50 attached to a predetermined portion on the bottom surface of the substrate 1;
A relatively short arm 34 is fixed to the motor shaft 33 of this drive motor 32, and a pin 35 is attached to the end of this arm 34. One end of a rotatable working rod 36 is attached.

The projecting rod 31 is guided through a through hole 37 provided at the other end of the working rod 36.

Reference numeral 38 denotes a shutter frame attached to the center shaft 26, and an arcuate wall 39 is erected at its tip.

Furthermore, on the bottom surface of the board 1 near the shutter frame 38,
As shown in FIG. 2, a U-shaped support plate 42, in which one of the upright pieces 40 is longer than the other upright piece 41, is attached, and a lamp 44 is attached to the one upright piece 40 via an insulating plate 43.
Photoelectric conversion elements 46 are attached to the other upright piece 41 via an insulating plate 45 so as to face each other,
The arcuate wall 39 is interposed between these.

The lamp 44, the photoelectric conversion element 46, and the arcuate wall 39 constitute a device for detecting the end of a record, and control the rotation of the tone arm 50 and the elevation of the elevator rod 22.

Next, a method for adjusting the height of the tone arm 5 in the tone arm automatic lifting device having such a structure will be described.

First, the set screw 8 for height adjustment is loosened, and the height of the force cartridge 13 relative to the surface of the record disc 18 is adjusted by raising and lowering the support collar 7 in the through holes 3 and 4.
The support collar 7 is held by tightening the setscrew 8 at a predetermined height position.

Therefore, a predetermined vertical tracking angle of the stylus of the cartridge 13 can be obtained, and distortion-free playback can be achieved.

By the way, as the support collar I is raised and lowered, the support collar 23 of the lifting rod 22 that constitutes the arm lifter and connected thereto via the connecting rod 21 is also raised and lowered.

Further, the lower end of the elevating rod 22 is connected to a rotary force plate 2 attached to a center shaft 26 that moves up and down at the same time as the support collar I.
It is located within the notch 30 of the T, and the height of the lifting rod 22 relative to the tone arm 5 remains substantially unchanged between before and after the above adjustment.

Therefore, even in an auto player in which the lifting rod 22 is raised and lowered in response to the movement or movement of the tone arm 5, the tone arm 5
Despite the height adjustment, there is no change in the relative positional relationship of the arm lifter to the tone arm 5, and the tone arm 5 always maintains a correct distance L from the surface of the record disc 18.

To explain this further in the case of automatic return of the tone arm 5, at the beginning of the performance, the lower end of the lifting rod 22 of the arm lifter is in the notch of the rotary lever 27 and is at the lowest position, and the tone arm 5 is lowered and the stylus 14 is guided to the initial position of the recording groove.

Playback is carried out in this way, and the stylus 14 is guided along the recording groove, which causes the tone arm 5 to rotate toward the center of the record 18, and when the stylus reaches the final position of the recording groove, the tone arm 5 is rotated toward the center of the recording groove. The arcuate wall 39 is a lamp 44
The final position of the photoelectric conversion element 46 is detected after the photoelectric conversion element 46 is unblocked.

Upon detection of this final position, the motor 32 rotates, rotates the protruding rod 31 interposed in the through hole 37 via the arm 34 and the working rod 36, and slides it in the notch 30 of the rotation force plate 27. The lower end of the lifting rod 22 is guided along the slope 29 following the notch 30, and the lifting rod 22 rises to lift the 1/1 arm 5 and lift the stylus 14 above the record 18.

The rotation of the motor 32 is transmitted to a return mechanism (not shown), and the rotation of the return mechanism causes the center shaft 26 to rotate, thereby returning the tone arm 5 to its original position.

In this way, according to the present invention, when the tone arm 5 is adjusted up and down, the arm lifter is also raised and lowered with the same stroke via the rotary lever. There is no need for the troublesome effort of separately adjusting the lifter's elevation.

Furthermore, the present invention provides a drive motor 3 with mass that serves as a drive source.
2 is attached to the base plate 1 on the fixed side, and the rotary force plate 27 is rotated through the arm 34 and the operating rod 36, thereby raising and lowering the lifting rod 22 and center shaft 26 of the arm lifter. Therefore, there is no need to move the drive motor 32 when adjusting the height of the tone arm 5, eliminating the feeling of weight and improving operability.

As described above, the present invention provides a player in which the arm lifter can be raised and lowered with respect to the board integrally with the tone arm by adjusting the height of the tone arm. The rotary force plate is movable in the upward and downward direction with respect to a transmission member to which a driving force from a drive source fixed to the substrate is transmitted. The lifting rod is controlled to move up and down by engaging and rotating the rotating force plate by the drive source via the transmission member, so that the arm lifter can be adjusted at the same time as adjusting the height of the tone arm. The height is also adjusted, and the relationship between the transmission member to which the driving force is transmitted and the rotating force plate is exactly the same before and after adjustment.
It can be applied directly to Fluoro players, which place emphasis on the support position and timing of the tonearm lifter, and since the drive source such as a drive motor, which has a relatively large mass, is fixed to the board side, the height of the tonearm can be reduced. You can reduce the feeling of weight when adjusting.

Furthermore, there is also the advantage that there is no need for work to fix the drive source to the board when transporting the product as a record player to which the present invention is applied, and work steps at the shipping stage can be reduced.

In addition, its configuration is extremely simple, the cost can be reduced by 1, and the practical value is extremely high.

[Brief explanation of drawings]

The drawings specifically show an embodiment of an automatic lifting device for a tone arm according to the present invention, and FIG. 1 is a plan view of the main part of this embodiment, and FIG. The front view, FIGS. 3 and 4 are a perspective view and an enlarged sectional view of the rotary lever. 1... Board, 5... Tone arm, 2
2... Lifting rod, 26... Tone arm shaft, 27... Rotating force plate, 32... Drive motor, 36... Working rod.

Claims (1)

[Claims] 1. In a player in which the arm lifter can be raised and lowered integrally with the tone arm relative to the board by adjusting the height of the tone arm, the rotational force that supports the lifting rod of the arm lifter on the tone arm shaft that goes up and down together with the tone arm. The rotary force plate is engaged with a transmission member that supports the rotary force plate and transmits a driving force from a drive source fixed to the substrate so as to be movable in the upward and downward directions, and An automatic tone arm elevating device, wherein the elevating rod is controlled to ascend and descend by rotating the rotating force plate by a drive source via the transmitting member.