CS226072B1 - Apparatus for adjusting vertical load to act upon the gramophone pickup - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for adjusting the vertical force on the tip of a record player that is part of a transfer arm.

Portable arms, which are almost exclusively tubular on hi-fi turntables, have a device to adjust the vertical force to the tip. The adjusting device is usually mounted on the rear of the arm behind the support bearing, usually as part of a counterweight whose main purpose is to balance the weight of the front of the arm with the built-in portable and to achieve equilibrium. The required vertical force on the tip is achieved by having a 'head'. the part of the counterweight, or its part by rotation, moves along the thread from equilibrium towards both the bearing and the bearing until the front part of the portable arm has its predominant weight exerting the desired vertical force on the portable tip according to the scale and indicator on the t weight. While this method is in principle simple, the practical solution is complex if a stable equilibrium condition is to be achieved with respect to the high center of gravity of the coaxially arranged projecting weight, while satisfying the requirement of easy, clear and undesirable failure of the resilient vertical force setting. It is also very difficult to add an effective anti-resonator to the counterweight so arranged or to install it in a sufficiently simple manner, in particular in a flat arm cross-sectional arm.

The smaller portion of the transfer arms reserves the rear counterweight only a balancing function to achieve an equilibrium state, with the vertical force on the tip being adjusted either by a sliding weight on the front of the arm or by a spring arranged at the bearing for vertical movement. The weight on the front of the arm, however, undesirably increases the effective weight of the arm, while the spring arrangement is in turn more complex or less accurate.

According to the invention, the above-mentioned drawbacks are eliminated by a device for adjusting the vertical force on the tip of a gramophone cartridge slidingly mounted in the rear, shorter portion of the flat transmission arm, provided with a toothed rack located in the longitudinal opening of the rear arm. SUMMARY OF THE INVENTION The pinion of the adjusting pivot element for adjusting the vertical force on the tip of the cartridge is mounted in engagement with the rack in the opening of the arm, and a counterweight system, part of which is laterally supported by at least one reinforcing element on the underside of the shoulder.

Advantages of the solution according to the invention consist in mechanical and manufacturing simplicity, especially in the case of flat cross-section arms, and in the possibility of placing the counterweight under the arm separately from the actual and adjusting element on its upper side. , thereby achieving a sufficiently stable equilibrium state of the transfer arm.

A further advantage lies in the possibility of creating the prerequisites for optimum placement of an effective anti-resonator enabling the vibration of virtually the entire weight of the counterweight, in particular at a flat cross-sectional arm.

The device for adjusting the vertical force on the tip of a record player according to the invention will be described in greater detail below in an exemplary embodiment by means of the attached illustration showing the device in side view and FIG. 2 showing its position in the toothed rack opening in the arm.

The base portion of the device for adjusting the vertical force to the tip of the record player comprises a flat transfer arm shown in Fig. 1 provided with a mechanical element 2 in its front part for rest locking the arm 1 in the storage stand, and in its rear part away from the bearing

Claims (2)

SUBJECT Apparatus for adjusting the vertical force to the tip of a record player slidingly mounted in the rear, shorter part of a flat transmission arm, having a rack at the rear of the shoulder, provided with at least one reinforcing element at the bottom of the arm, characterized in that the pinion (31) 1 in the X through a longitudinal bore 11, one side of which is formed as a rack rack 111, as shown in FIG. 2. The toothed rack 111 may, however, also be formed at another point of the rear portion of the transfer arm 1, for example at the side edges or in a cutout in one of the side edges, or may be attached to the transfer arm as a separate part. At the front end of the transfer arm 1 is mounted a pickup C with a point which, in the function of the device, is pressed against the gramophone plate R by an adjustable vertical force F. The toothed pinion 31 engages a pinion 31 of the adjusting rotary element 3 provided with a vertical force scale F when rotating, moves the spreader forward to or from the bearing X on the rear of the boom. A counterweight assembly 4, optionally including other functional elements, is fixedly connected to the adjusting rotary element 3, and is preferably mounted below the mechanical axis of the flat transfer arm 1 in order to achieve an optimally stable equilibrium thereof. Thus, when the adjusting pivot element 3 is rotated, the counterweight assembly 4 is displaced. BACKGROUND OF THE INVENTION An inverting pivot element (3) for adjusting the vertical force on the tip of the cartridge (C) is received in engagement with the rack (111) in the opening (11) of the arm (1). wherein a counterweight system (4) is rotatably attached to the adjusting rotary member (3), a portion of which is laterally supported by at least one reinforcing member (5) on the underside of the arm (1). >