Thread clamping adjustment knob of sewing machine

Abstract

The invention relates to a thread clamping adjustment knob of a sewing machine. The thread clamping adjustment knob of the sewing machine is mainly characterized in that a knob body is arranged on a screw of a sewing machine body in a screwed manner, the knob body is provided with screwing portions which are corresponding to the periphery of a central through hole and formed by surrounding the through hole, the internal diameter of the through hole is smaller than the external diameter of the screw, a thread is arranged on the inner face, corresponding to the through hole, of each screwing portion, and an elastic slot is formed in the periphery of each screwing portion. Thereby, via the elastic through hole, the knob body enables the knob through hole with the diameter smaller than that of the screw to generate extension margin, and screw joint with the screw is benefited, the screw can be clamped tightly to be prevented from loosening due to vibration, the screw can be no longer processed additionally to form an elongated slot, and structural strength of the screw is not damaged; meanwhile, processing cost and time of the elongated slot are reduced, substantial benefits such as simplification of parts and reduction of manufacturing cost are achieved, and practicality and convenience are improved in whole application and use of the knob.

Description

Technical field [0001] The present invention relates to a thread clamping adjustment knob of a sewing machine, in particular to a method that allows the knob to generate expansion and contraction margin, which is beneficial to screw connection with a screw, avoids vibration loosening, and makes the screw no longer need to be processed to form a long groove, reducing Processing cost and time can achieve substantial benefits such as simplifying parts and reducing manufacturing costs, and the overall implementation of the sewing machine thread clamping adjustment knob is more practical and functional. Background technique [0002] Usually, there are several adjustment knobs on the sewing machine to adjust the tightness of the sewing thread; among them, please refer to Figure 7 As shown in the conventional three-dimensional exploded structure diagram, the adjusting knob 3 is mainly provided with a screw 32 protruding from the base 31, a long groove 321 is axially opened in the center ...

AI Technical Summary

Problems solved by technology

[0004] Because the sewing machine will vibrate under high-speed operation, in order to increase the fixity between the knob and the screw, and prevent the knob from loosening and screwing back and affecting the tension of the sewing thread, the user generally expands the long groove on the end of the screw to increase the diameter of the screw. In order to further increase the screw tightening force between the screw and the screw hole of the knob, and the ratchet part meshes between the positioning knob and the knob to prevent the knob from loosening and screwing back. If it is found that the knob and the screw will gradually loosen, and In order to further increase the screw tightening force between the two, the user will stretch the long groove of the screw rod again. In such a vicious cycle, when the long groove is repeatedly stretched, the screw will easily break at the bottom of the long groove, causing the screw to break. damage

[0005] In addition, the thread tension adjustment knob of the existing sewing machine must be processed on the screw rod to form a long groove in the manufacture and assembly. After the inner and outer clamping pieces, elastic elements and positioning buttons are sleeved on the screw rod in sequence, the knob is then screwed. , so the assembly parts are cumbersome. In addition to increasing the manufacturing cost, the assembly is also quite time-consuming and inconvenient. In particular, the screw rod forming the long groove lacks appropriate tools to be locked on the base or the body, and components such as positioning buttons are small in size and easy to assemble. Loss occurs, causing loss in manufacturing cost and inconvenience in assembly

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