Automatic thread feeding mechanism

Abstract

The invention discloses an automatic wire feeding mechanism, which comprises a knob, a roller a, a pressure roller, a roller b, a conductive sheet, a tension spring, a motor roller, a motor, a pressure spring, an insulating pin and a cylindrical pin; The upper side and rear side of the wire feeding mechanism are equipped with a roller a, which can rotate along itself; the motor is installed in the middle of the automatic wire feeding mechanism, and a motor roller is installed on the motor shaft; the pressure roller passes through the cylinder The pin is installed on the middle side of the automatic wire feeding mechanism, on the same side as the knob, and the outer circular surface of the pressure roller is pressed against the outer circular surface of the motor roller; the conductive sheet is installed on the bottom side of the automatic wire feeding mechanism through an insulating pin. Located under the wire ring of the tension spring. An automatic thread feeding mechanism. When the tension of the thread causes the tension spring to contact the conductive sheet, it realizes the automatic thread loosening function, ensuring that the thread before the thread loosening device is "zero tension", and can adjust the thread more when sewing ultra-thin fabrics. Loose, thereby improving sewing quality.

Description

technical field [0001] The invention belongs to the technical field of full-automatic sewing machines, and in particular relates to an automatic thread feeding mechanism for full-automatic sewing machines. Background technique [0002] The thread path of a fully automatic sewing machine is from the spool to the thread frame, then through the knob and other thread passing parts, through the thread release device, to the thread take-up lever, and to the needle. Usually, the tension of the upper thread can be adjusted by adjusting the thread release device when sewing ordinary fabrics. [0003] However, when sewing ultra-thin fabrics, because there is a lot of friction between the thread loosening device and the bobbin, and there is an adhesive force between the thread on the bobbin and the thread at the same time, even if the thread loosening device is adjusted to the maximum slack, it cannot satisfy the upper thread. Tension requirements, when sewing, cannot guarantee the se...

AI Technical Summary

Problems solved by technology

[0003] However, when sewing ultra-thin fabrics, because there is a lot of friction between the thread loosening device and the bobbin, and there is an adhesive force between the thread on the bobbin and the thread at the same time, even if the thread loosening device is adjusted to the maximum slack, it cannot satisfy the upper thread. Tension requirements, when sewing, the sewing quality cannot be guaranteed

Images