Electric sewing machine

Abstract

The invention discloses an electric sewing machine which comprises a machine head, a bedplate, a stent, an electromotor and a pedal, wherein, the machine head is provided with a presser foot and a machine needle which are arranged in the position opposite to the bedplate; the presser foot is provided with a U-shaped opening; and the electromotor is provided with a clutch which is linked with the pedal through a link lever; and the electric sewing machine also comprises a bobbin thread monitoring apparatus. When the electric sewing machine works at a high speed, and conditions that bobbin threads use up or break, the stitch slips, the bobbin threads loose, etc. happen, a thread position sensor can be triggered by sewing threads on the machine needle, and a signal can be given out to impel the bobbin thread monitoring apparatus to act and enable the electric sewing machine to stop. The bobbin thread monitoring apparatus has the advantages of simple structure and low manufacturing cost, and no need of a complicated electronic control system for realizing the bobbin thread monitoring; and the machine can be stopped when no bobbin thread exits and the bobbin threads breaks, or the stitch slips or the bobbin threads loose, thereby realizing the effect that the sewing material is effectively utilized, saving resources, reducing the product rework rate, and improving the production efficiency.

Description

technical field

[0001] The invention relates to an electric sewing machine. Background technique

[0002] The electric sewing machine is a sewing tool with automatic operation function. You only need to place the fabric to be processed on the correct position of the platen. After the power switch is turned on, the motor of the sewing machine starts, and the sewing machine automatically enters the forward sewing state to sew the fabric when the pedal is pressed. After the pedal is released, the clutch in the motor disengages, and the sewing machine stops working. When the sewing machine is working at high speed, it is difficult to observe the internal conditions of the sewing machine with the naked eye, especially when the bobbin thread is used up, stitches are skipped, and the bobbin thread is too loose. Once these situations happen, the workers cannot detect in time at all, and there are quality problems such as loose stitching and loose sewing threads in the sewn fabrics....

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