Thread trimming mechanism driving device for sewing machine

Abstract

The invention belongs to the technical field of sewing machines, and particularly relates to a thread trimming mechanism driving device for a sewing machine. The thread trimming mechanism driving device comprises a driver fixed on a casing, wherein a connecting plate is connected to a movable rod of the driver; the connecting plate is connected with a guide rod; a spring seat fixed on the casing is arranged on the guide rod; a reset spring sleeves the guide rod; one end of the reset spring is propped against the spring seat, and the other end of the reset spring is propped against a check ring; the check ring is fixed on the guide rod; the position of the check ring on the guide rod is adjusted to adjust the elastic force of the reset spring; a guide block is also arranged on the guide rod, and is connected with a cutterhead driving rod through a trimming connecting rod; a movable rod of the driver acts to drive the guide rod to move to compress the reset spring; the guide block moves along the guide rod to drive the cutterhead driving rod to act. Through the change of the structure of a trimming electromagnet, the mounting position of a trimming electromagne guiding part is shifted, and the connecting manner of the electromagnet and the guiding part is changed.

Description

Technical field: [0001] The invention belongs to the technical field of sewing machines, in particular to a driving device for a thread trimming mechanism of a sewing machine. Background technique: [0002] The existing stretch seam thread trimmer electromagnet structure has a large appearance, so it takes up a lot of space and has a high cost. The connecting rod of the lower thread cutter is relatively forward (towards the direction of the machine head), and the existing thread trimming electromagnet is generally installed at the rear, which requires a very long connecting rod to connect with the thread trimming connecting rod, resulting in instability. Therefore, the precision requirement of the electromagnet is high, otherwise it is easy to get stuck, and the thread trimming function of the sewing machine cannot work normally. Invention content: [0003] The object of the present invention is to provide a driving device for a thread trimming mechanism of a sewing machi...

AI Technical Summary

Problems solved by technology

The connecting rod of the lower thread cutter is relatively forward (in the direction of the machine head), and the existing thread trimming electromagnet is generally installed at the rear, which requires a very long connecting rod to connect with the thread trimming connecting rod, resulting in instability

Therefore, the precision requirements for the electromagnet are relatively high, otherwise it is easy to get stuck, and the thread trimming function of the sewing machine cannot work normally.

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