Sewing machine with presser foot drop buffer

Abstract

The invention discloses a sewing machine with a pressing foot falling buffering device. The sewing machine comprises a machine head, wherein a sewing machine pressing foot lifting mechanism is arranged on the machine head; the sewing machine pressing foot lifting mechanism is provided with the pressing foot falling buffering device; the pressing foot falling buffering device comprises a piston and an air cylinder; the piston is movably arranged in the air cylinder; the piston and the air cylinder are in clearance fit; the piston can move up and down relative to the air cylinder, so that positive pressure or negative pressure is formed in a cavity of the air cylinder; the piston and the air cylinder are directly or indirectly mounted on two members, which have relative displacement, of the sewing machine respectively; the piston or the air cylinder is provided with a check valve; and positive-pressure damping or negative-pressure damping is formed in the air cylinder by the check valve. According to the sewing machine with the pressing foot falling buffering device, the positive-pressure damping or the negative-pressure damping can be generated when a pressing foot falls off, and part of impact force is cancelled when the pressing foot falls off, so that the falling-off speed of the pressing foot is slowed down, and noises caused by the fact that a needle plate directly or indirectly collides with the pressing foot are alleviated.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a sewing machine with a presser foot drop buffer device. Background technique [0002] During the sewing process of the sewing machine, the presser foot needs to be lifted to place the sewing material under the presser foot, and the pressure spring pushes the presser foot down to press the sewing material tightly. In order to save effort, electromagnets are often used in sewing machines to drive the presser foot lifting mechanism. [0003] Such as figure 1 As shown, the sewing machine presser foot lifting mechanism includes an electromagnet 1, the movable end of the electromagnet 1 is connected to the ejector rod 2, and the top of the ejector rod 2 is connected to one end of the connecting rod 4-1 through the third axial screw 9, and the connecting rod 4-1 The other end of the rear crank assembly 4 is connected to the first movable end, the fixed end of the rear crank assembly 4 is connected...

AI Technical Summary

Problems solved by technology

[0006] Although the presser foot 15 is lifted higher, it is convenient to place the sewing material, but when it falls, it will hit the needle plate directly or indirectly, and the noise will be louder.

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