Sewing machine and machine head turnover protective device thereof

Abstract

The invention discloses a machine head turnover protective device of a sewing machine. The machine head turnover protective device comprises a motor controller and a position sensor connected with themotor controller; the position sensor is used for detecting the relative position between the machine head and a platen in real time and generating position information to be fed back to the motor controller; the motor controller judges whether the machine head is turned over or not according to the position information, and if the machine head is turned over, controls a main shaft driving motorto stop operating; compared with a condition that the machine body is not turned over, when the machine body is turned over from the platen, the relative position between the machine head and the platen is changed for sure, and the motor controller judges whether the machine head is turned over or not according to the position information; and therefore by virtue of the machine head turnover protective device provided by the invention, machine head turnover can be detected in time through the position sensor and the motor controller, and protection can be performed, the reliability is relatively high, and the safety performance of the sewing machine is relatively high. The invention also discloses a sewing machine comprising the machine head turnover protective device.

Description

technical field [0001] The invention relates to the technical field of sewing machine safety, in particular to a head overturn protection device for a sewing machine. In addition, the present invention also relates to a sewing machine comprising the above-mentioned machine head overturn protection device. Background technique [0002] Existing direct-drive sewing machines include a horizontally arranged table, a body reversibly mounted on the table, a motor assembly mounted on the body, and a motor controller for controlling the operation of the motor assembly. Wherein, the main shaft of the motor main body and the main shaft of the body are coaxial, and the main shaft of the sewing machine head is driven by the motor main body to rotate for sewing when the motor main body is running. When adjusting or maintaining the mechanical structure of the direct-drive sewing machine, it is necessary to turn the body over from the table. In some cases, for example, the operator forget...

AI Technical Summary

Problems solved by technology

However, the contact points inside the current metal ball switch are rigid point contacts, and the contact points are very small. Generally, only 90% of the conduction rate can be guaranteed, and the reliability is not enough. In addition, when the sewing machine is running at high speed, if the machine head is not careful at this time Overturned, because the mechanical vibration when the sewing machine is running will cause the ball to vibrate, which will cause the metal ball switch to change rapidly between the on and off states, which is not conducive to the effective judgment of the electric control, and ultimately leads to the inability to play a protective role. Reduced safety performance

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