A sewing machine and its presser foot lifting device

Abstract

The invention discloses a presser foot lifting device. The device comprises a rotating shaft, a limiting clamping plate, an elastic part, a cam and a rotating handle, wherein the cam and the rotatinghandle fixedly sleeve the rotating shaft; the end, away from the rotating shaft, of the rotating handle is provided with an arc-shaped side wall; the limiting clamping plate is in abutting contact with the arc-shaped side wall, the limiting clamping plate can be hinged to a shell, the two ends of the elastic part are connected with the limiting clamping plate and the shell respectively, and the limiting clamping plate is pushed and pulled downward; the elastic part and the rotating handle are distributed at the two sides of a rotating pin, so that the limiting clamping plate pushes the rotating handle in the forward direction. The presser foot lifting device utilizes the restoring force of the elastic part to indirectly control the rotating handle to rotate in the forward direction, thereby driving the cam to push a pressing rod guide frame upward to achieve presser foot lifting, and reducing the labor intensity of manual presser foot lifting. The invention further discloses a sewing machine having the above advantages.

Description

technical field [0001] The invention relates to the technical field of sewing equipment, more specifically, to a presser foot lifting device. In addition, the present invention also relates to a sewing machine comprising the above-mentioned presser foot lifting device. Background technique [0002] In order to sew high-quality stitches and make the feed teeth have good feeding quality, the existing sewing machines need the presser foot to have a suitable presser foot pressure to press the sewing material tightly. Due to the relatively high pressure of the presser foot, it will be more difficult for the staff to lift the presser foot manually, resulting in greater labor intensity for the workers; while using an electromagnet to automatically lift the presser foot, the electromagnet needs to provide a sufficient driving force. Iron is prone to heat, abnormal noise and other adverse problems. [0003] To sum up, how to reduce the force required for lifting the presser foot on...

AI Technical Summary

Problems solved by technology

Due to the relatively high pressure of the presser foot, it will be more difficult for the staff to lift the presser foot manually, resulting in greater labor intensity for the workers; while using an electromagnet to automatically lift the presser foot, the electromagnet needs to provide a sufficient driving force. Iron is prone to heat, abnormal noise and other adverse problems

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