A rack foot pad with adjustable stiffness

Abstract

The invention relates to the technical field of sewing machines, in particular to a rigidity-adjustable type rack foot pad. The rigidity-adjustable type rack foot pad comprises a pressing plate used for being connected with a rack, and an elastic supporting part for supporting the pressing plate elastically. The elastic supporting part comprises a first elastic part and a second elastic part. The first elastic part and the second elastic part are dislocated oppositely and nested and arranged below the pressing plate in the manner of allowing the spacing distance to be adjusted. By adjusting the spacing distance between the first elastic part and the second elastic part, rigidity of the foot pad can be adjusted, adjustment of resonant frequency of the foot pad is achieved, thus, the rigidity and the resonant frequency of the foot pad can achieve the state matched with the whole machine optimally, therefore, the optimal vibration reduction rigidity of the foot pad can be determined fast through debugging, foot pads of various specifications do not need to be tested and determined one by one, the research and development and debugging efficiency is improved greatly, moreover, the specification variety of the foot pad is reduced, and the foot pad has the beneficial effects of being good in universality, low in cost, simple in structure and convenient to debug, and has the effect of reducing vibration.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a frame foot pad with adjustable stiffness. Background technique [0002] Existing larger sewing machines, such as template machines and pattern machines, all adopt foot cups as the supporting foot pads of the whole frame. There are many specifications of the foot cup, and each specification of the foot cup has its own fixed structure and rigidity. Once the specification is not selected properly, the stiffness of the foot cup does not match the machine, which may cause the working speed of the whole machine and the resonance frequency of the foot cup. Close, resulting in a large vibration of the whole machine, which seriously affects the competitiveness of the product. But looking for a foot cup that can match the whole machine and whose resonance frequency is far away from the working speed of the whole machine can only be determined by purchasing a variety of specifica...

AI Technical Summary

Problems solved by technology

There are many specifications of the foot cup, and each specification of the foot cup has its own fixed structure and rigidity. Once the specification is not selected properly, the stiffness of the foot cup does not match the machine, which may cause the working speed of the whole machine and the resonance frequency of the foot cup. Close, resulting in a large vibration of the whole machine, which seriously affects the competitiveness of the product

But looking for a foot cup that can match the whole machine and whose resonance frequency is far away from the working speed of the whole machine can only be determined by purchasing a variety of specifications of the foot cup and testing one by one. Not only is the research and development efficiency very low, but the final determined foot cup may not It is the best match with the whole machine

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