SU1062771A1 - Phonograph pick-up arm - Google Patents

Abstract

1. SOUNDMARKER TONARM, containing a suspension assembly, including a lower fixed base, and a toning clamping force generating unit, characterized in that, in order to improve the quality of reproduction, the subarm suspension suspension node is worn with an upper movable base, fixed in one of the bases and installed in the stopper of the OTHER base, as well as the supporting element made in the form of a ball located between the lower fixed and upper movable bases, while the center of mass of the tonearm is displaced relative to the axis of the ke raspolozhen1 on towards the support member.

Description

2. The tonearm under item 1, characterized in that the knot to create downforce force of the tonearm is made in the form of an electromagnet, fixed

on one of the grounds with the possibility of interaction with the korem, us-, established on another basis.

The invention relates to electric-playing devices, in particular, to sound pickup tonearms.

Suspensionistarms are known that contain a rotary (with respect to the vertical geometric axis, a base with needle supports on which the base of the arm is mounted, rotatable with respect to the horizontal, geometric axis of rotation, formed by the needle supports ij

Closest to the invention, the technical essence is a tonearm arm, containing a tonearm suspension assembly, including a lower fixed base, and a clamping force generating unit of tonearm 2,

However, in the well-known tonearm, the clamping force is constant, the value during playback, which leads to increased wear of the initial zone of the record, reduces the life of the sound-reproducing needle, in addition, the suspension assembly has an increased frictional force when the toner moves in both planes.

The purpose of the invention is to increase the reliability of work and the quality of reproduction.

The goal is achieved by the fact that in the tonerm of the pickup, the suspension unit of the tonearm is equipped with an upper movable base, a core fixed in one of the bases and mounted in the base plate of another base, as well as a supporting element made in the form of a ball located between the upper movable and lower fixed bases while the center of mass of the tonearm is shifted relative to the axis of the core support in the direction of the position of the support element,

The unit for generating downforce of the tonearm is made in the form of an electromagnet, fixed, on one of the bases with the possibility of interaction with a crust mounted on another base.

FIG. 1-3 presents con. structural schemes tonearm, top view; in fig. 4 - b - various arrangements of the supporting element; in fig. 7 — unit for making down force; in fig. 8 - tonearm, with a shift in the center of mass; in fig. 9 is a constructive variant in which friction forces are distributed in order to compensate for the rolling force; in fig. 10 and 11 are structural diagrams of the location of the support element in the groove of one of the bases; in fig. 12 is a diagram of the distribution of forces per tonearm for the embodiment of FIG. 9; in fig. 13 is a plot of the change in downforce acting on the tonearm for the embodiment shown in FIG. 2 and 5; in fig. 14 is a graph showing the change in roll force in the pickup toner arm of FIG. 2 and 3.

FIG. 13 and 14 R, -R is the radius of the groove to be reproduced.

The pickup arm contains a tube 1 of the arm, a lower 2 fixed and upper movable 3 bases vertical core 4 of the suspension assembly, fitted in the stopper 5 of the lower fixed base 2 and fixed in the upper movable base, supporting element - ball b, electromagnet 7, measles 8, counterweight 9, screw 10, holding measles 8.

FIG. 4 shows a constructive variant when the ball 6E of the suspension assembly is located in the spherical recess 11 of the lower base 2; in fig. 5 ball 6: located in the recess 12 of the upper rolling oo, nova 3; in fig. b, the ball 6 of the suspension unit is located in the guides; the elements of the grooves 13 and 14 of the upper i and the lower base; in FIG. 7, the ball 6 is located in Hait by the right of the groove 15, and the core 4 is fitted into the plate 5 of the plate 16 of the lower base 2; in fig. 8, the guide groove 15 is formed at the bottom of the base 2, while the plate 16 of the upper base 3 rests against the ball b.

The electromagnet 7 (Fig. 10) is attached with to the lower base 2 with screws 17 and 18, the measles 8 is fixed on the tonearm 1 screw 10.

In the head of the tonear 19 A-A - the position of the pickup on the initial grooves of the record (Fig. 1-3); BB - the position of the sound pickup on the final grooves of the record

(Fig. 1-3);

a - a

the horizontal axis of rotation of the tonearm, formed by the supporting surfaces of the core 4 and the ball 6 (in Figs 1-3, 9). b - b is the geometrical axis of rotation vertical. I I i And - fixed positions of the electromagnet (in Fig. 1-3). The dotted line shows the new positions of the tonearm. The phonoarm pickup works as follows. The base 3 with the pickup head 19 fixed on it and the counterweight 9 rotates around the vertical axis b - b of the arm while moving in the direction B towards the center of the record. The change in downforce during playback is as follows (Fig. 1 and f). When the location of the needle pickup. bodies on the gradual grooves of the grammar presser force is determined by the relation .co with V-TT where r (is the presser force; t is the shoulder of the force F (i.e., the distance from the needle (to the horizontal geometric axis aa and force developed by an electromagnet or a permanent magnet (Fi COnst); 2 is the arm of force Fj, i.e. the distance from the magnet to the horizontal geometric axis a-a of the arm and arm.When the needle moves (I) from A to B 6 , the shoulder of the force f increases by an amount, while Kj n varies, and, consequently, the clamping force f (decreases with. An A logical balance of forces and shoulders occurs when the electromagnet is located at other points (for example, AND and GTT.) Figures i and 5 show the following constructive variant of the invention. Ball b is located in a spherical (or other shape) recess 12 of the upper base 3 and moves together with it relative to the lower base 2. When the tonearm operates in the position of electromagnet 1, the arm {j does not change, tn increases, therefore, with F g const F increases c. .21 shoulder action force Fg position I, BIjj - shoulder action force p2 in position X To the new I. g (.gf position of the horizontal axis. In the position of the electromagnet I. (Electromagnet is rotated through a certain angle, a-a - new arrangement of the horizontal axis) when the tonears work, the shoulder does not change and the K-2 shoulder JI first increases, then after reaching a certain point; The maximum value of 8.7 lcd s decreases and becomes equal to the initial S2; the pressing force due to directly proportional dependence on the E value will change in the same way (Fig. 13). This option provides for the rolling force to be compensated according to its law. the electromagnet T when the arm is working, arm BI does not change, arm 12 decreases, and the pressing force Pj decreases accordingly. Fig. 3 and b show a design variant in which the ball 6 of the suspension assembly is mounted in guide elements (grooves 13 and 14 ) the upper arm and the ball b are shifted relative to both bases 2 and 3. As a result of this displacement, the following variants of the downforce ratio and arm size K and Ej are possible depending on the location of the electromagnet. In the position of electromagnet I, as the tonearm advances to the terminal grooves of the record, the force of force 2 increases more rapidly than the force of force F. Since the clamping force, r-, then the primal l will smoothly increase. In position II of the electromagnet, the change in arm II will be less than the change in arm E (and therefore f (downforce) decreases. In position 1IJ of the electromagnet, shoulder O III, unlike the previous two variants of electromagnet I and L, is reduced, which leads to a sharp decrease. Presented design options allow you to get different options for changing the clamping force, which can be used for various purposes in the process of equipping the pickups, for example, to compensate for the rolling force, according to its law or for automatically changing the magnitude of the clamping force. FIG. 10 shows the electromagnetic device; Impacting force. The electromagnet 7 is attached to the panel of the electric player by screws 17 and 18, the measles 8 are mounted on the arm. Other mutual arrangements of the electromagnet and core are possible, for example, core on the EDA panel, and the electromagnet - on the arm, Consider the constructive option, as reflected in Fig. 8-12. The base 3 with the pickup head 19 fixed on it and the counterweight 9 rotates around the vertical axis bb of the tonear as it moves towards the center of the record in direction B. At that, the ball 6, resting against the edge of the groove 15, moves with sliding friction over the plate 16 base 2. The value of the friction sliding force is chosen equal to the amount of the rolling force and directed in the opposite direction, due to which the rolling force is compensated. When the tonear moves from the center of the record in the z direction (due to eccentricity), the base 3 rolls back. At the same time, the ball moves (rolls) on the base plate 16 of the base 2 without sliding friction with minimal friction to the skid. The fact that at least one of the supporting surfaces of the upper or lower base (Fig. 12) is inclined is made. Thus, when the toner moves forward to the center of the record, the rolling force is compensated for by the sliding friction between the syric and the base plate. At the moment of stopping and when the tonearm moves back from the center of the record, due to force I arising from the decomposition of the force of gravity P into components. In this design, it is horizontal and vertical; in the case of the axle of the tonear, rolling friction acts, due to which the moment of friction forces in the tonearm support is significantly reduced, which allows the pickup to move along the platings without a braking action. The proposed tonearm thanks to the combination of the suspension unit with the clamping force generation unit makes it possible to vary the clamping force in the reproduction process, which in itself gives such important advantages as ensuring the durability of the records and the reproducing needle, and in addition provides the ability to compensate the rolling force according to the law of its change at a certain location of the electromagnet relative to the geometric axes of the tonearm. Further, this device, due to the simple and original design of the suspension arm of the tonearm, provides minimal friction in the horizontal and vertical axis of rotation of the tonearm, which is less than 7 mg. A wide variety of constructive embodiments of the device makes it possible to obtain various options for varying the clamping force. The combination of minimal friction in geometric axes of rotation of the ton-arm with the ability to adjust downforce, as well as all the other advantages resulting from this, provide the design with high technical and operational and economic indicators.

Sch 6 3

7/7

FIG. 6

H / H / H / H / O

Fm.7

Claims (2)

1. TONARM OF THE CARTRIDGE CONJECTOR, comprising a suspension unit including a lower fixed base and a tonearm clamping force generating unit, characterized in that, in order to improve playback quality, the tonearm suspension unit is provided with an upper movable base, a core fixed in one of the bases and installed in the thrust bearing of the other base, as well as the supporting element, made in the form of a ball located between the lower fixed and upper movable bases, while the center of mass of the tonearm is shifted relative to the axis of the core support in systematic way the location of the support member. 2, Tonarm in π. 1, characterized in that the tonearm clamping force assembly is made in the form of an electromagnet fixed on one of the bases with the possibility of interaction with an anchor mounted on another base.