JPS5932022Y2 - Tone arm rotation braking device - Google Patents

Description

[Detailed description of the invention] The present invention relates to the tone arm of a record player, and in particular, a tone arm braking device that temporarily brakes the horizontally rotating portion K1 of the tone arm to facilitate horizontal balance when adjusting the stylus pressure. Regarding.

With the pink amplifier tone arm, if the arm is configured so that it does not move horizontally when adjusting the horizontal balance when adjusting the stylus force, but only moves vertically at a predetermined position, the stylus force adjustment will be very easy. It is easy to perform, and the notone arm with a special inside force canceler is better than a record.
Because it tends to flow outward and makes it difficult to maintain horizontal balance,
It was necessary to release the inside force canceller mechanism.

Even if the inside force canceller mechanism is released in this way, the tone arm is free in the horizontal direction, so the tone arm moves horizontally with the force of the hand, so you have to be careful to maintain horizontal balance and turn pink up. It has the disadvantage of damaging the tip of the X needle when it hits a table, center shaft, etc.

The present invention aims to provide a rotary braking device for a tone arm which eliminates the above-mentioned drawbacks, and is designed to temporarily brake the horizontal rotary portion C1 of the tone arm and to operate the inside force canceller mechanism. It is designed to be linked with.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of the tone arm rotation braking device of the present invention, in which a tone arm 1 is joined to a base 2, and a vertical rotation shaft 3 is attached to the base 2 in a direction perpendicular to the axial direction of the tone arm 1.
is pivotally mounted so that it can rotate vertically about the horizontal rotation axis 4.

The horizontal rotation shaft 4 is fitted into a horizontal rotation bearing 6 so as to be horizontally movable, and the horizontal rotation bearing 6 is fixed to a base 7VC, and the horizontal rotation bearing 6 is fixed to a base T.
is fixed to the turntable board 8.

In the present invention, a stud 14 is installed on the turntable board 8 near the rotation axis of the tone arm 10 as described above, and the shilling 10 is fixed on the stand.

Inside the cylindrical 7 rings, a piston 9 is fixed to the tip of the piston 9 by a spring 11 wound around the outer circumference of the horizontal rotation shaft 4. It is made so that it is in contact with the surface,
A release knob 13 is integrated into the piston 9, and the knob has a semicircular shape, and is configured so that the knob is rotated and locked after being pulled against a stopper 12 placed below the sill 10. There is.

In the above embodiment, braking was performed on the upper surface of the turntable full board 8, but as shown by the one-dot chain line, the horizontal rotation shaft 4 is extended downward to the shaft 15 of the turntable full board 8, and the same method as described above is applied. It is clear that the braking mechanism 16 may also be arranged below the turntable board.

FIG. 2 shows another embodiment of the present invention, and is a plan view of the horizontal rotation shaft 4 cut at a predetermined position. The shock absorber is attached to the tip of the arm par 11, and the other end of the arm par IT is movable around the horizontal rotation fulcrum 18, and the spring 1
1 provides a biasing force that presses the shock absorber 5 against the horizontal automatic axis 4VC.

On the other hand, the cam 19 is configured to be rotatable around a shaft 20 and is placed at a position away from the arm lever 1γ, the shaft portion is provided with frictional resistance, and the lever 21 is fixed to one end of the cam 19. By rotating the lever 21 to the dotted line position, the buffer body 5 can be removed from the horizontal rotation shaft 4.

FIG. 3 shows still another embodiment of the present invention, and is a plan view of the horizontal rotation shaft 4 cut in a direction perpendicular to the axial direction, similar to FIG. Lever 25 nearby
A rotary roller 24 having the following characteristics is set up on a turntable board or the like, one end of the rc band 22 is fixed at the fixing point 23, and the rc band 22 is wound around the horizontal rotary shaft 4 by half a turn, and then wound around the friction roller by a further half turn. Rotate to connect the spring 22 to the other end of the band and fix one end of the spring 11 to the fixed end 26.

In this way, if the knob 25 of the friction roller 24 is rotated counterclockwise, the band 22 and the horizontal rotation shaft 4 are separated and released, and if the lever 25 is rotated clockwise, the band 22 and the horizontal rotation shaft 4 are released. The tone arm contacts the rotation shaft 4 to define the rotation of the tone arm in the horizontal direction.

In each of the above embodiments, a case has been described in which the rotational braking device for the tonearm is arranged around the tonearm, but FIG. 4 shows a case in which the inside force canceller mechanism is also used as the rotational braking device for the tonearm. and FIG. 5 will be explained.

FIG. 4 shows an inside force canceller mechanism previously proposed by the present applicant. A rotary drum 2T is fixed to the horizontal movement axis 4 of the tone arm, and the corresponding rotary drum 27
A tapered magnetic plate 28 is attached to the outer periphery of the tapered magnetic plate 28, and a magnet 29 is arranged near it.By changing the distance between the magnets, the rotational torque is generated within the angle range in the direction a by the attractive force of the magnet. It is done so that you can get it.

A tone arm rotation braking device using such an inside force canceling mechanism will be explained with reference to FIG.

The same parts as in FIGS. 1 to 4 are given the same reference numerals and redundant explanations are omitted. The eye movement torque is adjusted depending on the distance between the magnet and the rotary drum.During normal operation, the magnet is not brought into contact with the rotating drum, but only when braking is performed, the magnet is moved so that the buffer body of the magnet is brought into contact with the rotating drum (27Vc). It is something.

Also, in the above structure, instead of attaching a buffer to the magnet side,
It is also possible to attach a cushioning material such as felt to the outer periphery of the rotating drum.

Furthermore, in order to connect the tone arm eye movement braking device shown in FIGS. 1 to 3 to the inside force canceller, for example, the V-bar 21.25 shown in FIG.
can also be linked to the adjustment knob of the inside force canceller.

Furthermore, if the tone arm has a drive source such as a motor and automatically horizontally balances, it is of course possible to electrically control the drive section and perform desired rotational control at any position or torque.

As described above, according to the present invention, the horizontal balance of the stylus pressure adjustment can be ensured, and there is no possibility that force may be applied to the arm by mistake, causing damage to the stylus tip if it hits the turntable, record surface, or center spindle. can be prevented.

Furthermore, the structure is very simple, and additional units can be easily attached to an existing player or tone arm.

Regarding Fig. 4, a special mechanism was required to keep the magnet at a sufficient distance from the rotating drum to release the canceller, and the cost was extremely high, but according to the present invention, this is not necessary. Since it is only necessary to expand the mechanism for moving the magnet a little, the cost can be significantly reduced and it is of great commercial value.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the tone arm rotation control device of the present invention. FIG. 2 is a plan view showing another embodiment of the present invention. FIG. 3 is a plan view showing still another embodiment of the present invention. FIG. 4 is a perspective view of a conventional σ9 inside force canceller device. FIG. 5 is a side sectional view of a tone arm in which a tone arm rotation braking device is added to the inside force canceller device shown in FIG. 4. 1 is the tone arm, 2 is the base, 3 is the vertical rotation axis, 4.1
5 is a horizontal rotation axis, 5 is a buffer body, 9, 11゜26tx Suff' IJ song 10 is a cylinder, 12 is a stomper, 1
3 is the knob, 1T is the arm lever, 19 is the cam, 21 is the lever, 22 &! The band 24 is a friction roller.

Claims (1)

[Scope of utility model registration request] (0) A mechanism is added to apply a braking force from the outside to the horizontal rotation axis of the tone arm, so that the tone arm is horizontally balanced when the inside force canceller device is released. Tone arm rotation braking device (2) Utility model registration claim 1, characterized in that a mechanism that applies a braking force to the horizontal rotation axis of the tone arm is released when an inside force canceller device is operated. The tone arm rotation control device described in .