Drive device for record player and control method thereof

Abstract

The invention discloses a drive device for a record player. The device comprises a disc record, a first motor, a tone arm and an arm retraction device and is characterized in that: the arm retraction device comprises a second motor, a swinging piece, a lifting rack, a bracket wheel and a driving mechanism, wherein when a second switch is in a closed state, the second motor starts and turns on a time delay circuit; when the second switch is open and the time delay circuit is in an off state, the second motor stops rotating; the swinging piece is in linkage with the tone arm; when the tone arm is in a retracted state, a first switch and the second switch are open; when the tone arm is in a disc record working state, the first switch is closed; the tone arm is in a disc record ending state, the second switch is closed; the input end of the driving mechanism is connected with the shaft of the second motor; and the output end of the driving mechanism is connected with a rotating shaft of the bracket wheel. Compared with the prior art, the driving device of the invention drives the tone arm to automatically retract by driving the driving mechanism by using the second motor so that the overall structure is more compact; the on / off of the first switch and the second switch is realized by the action of the swinging piece; and the action has short stroke and is triggered in place, so that an action error is avoided and the arm retraction is controlled more accurately and reliably.

Description

technical field [0001] The invention relates to an electric record player, in particular to an electric record player drive device and a control method capable of realizing automatic arm return. Background technique [0002] The record player (also known as the phonograph earlier) is a sound playback device. Its working principle is to reproduce the pressure change of the sound wave as accurately as possible by fluctuating on the plane of the turntable. The needle moves along the groove, and the needle tip moves slightly with the groove fluctuation. The ground vibrates, and this vibration is amplified and dispersed in the air by sending a membrane through a mechanical device. Usually, the record player drives the record to rotate through the rotation of the turntable. The rotation of the turntable includes two driving modes: hand crank and electric drive. The hand drive means that after the record player is fully wound, it can continuously play the front and back sides of a ...

AI Technical Summary

Problems solved by technology

However, the arm return device of this patent uses an electromagnet. In order to ensure reliable suction, the installation distance between the electromagnet, the ratchet and the gear has certain requirements, and the electromagnet needs to be reliably positioned at the position required by the design. , has high requirements for installation. If the product needs to be transported for a long distance, the electromagnet will easily be dislocated during the transportation process, which will affect the normal use of the record player; Discharge, and then the electromagnetic attraction generated by the electromagnet will attract the ratchet linked with the tonearm to the trigger position. This kind of tonearm action has a large error, which is restricted and affected by the capacity of the capacitor discharge and the capacity of the electromagnet coil. It is difficult to guarantee the accuracy of the return arm movement due to misoperations such as early arm return or delayed arm return; moreover, due to the magnetism of the electromagnet, the record player is easily subject to external interference during transportation and use, which will damage the accuracy of the arm return device of the record player , reducing the reliability of the record player to use

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