Thread trimming drive assembly, thread trimming mechanism and sewing machine

Abstract

The invention relates to a thread shearing drive component, a thread shearing mechanism comprising the thread shearing drive component and a sewing machine comprising the thread shearing mechanism. The thread shearing drive component comprises a thread shearing shaft, a thread shearing drive crank, a drive shaft and drive cam and is characterized in that the thread shearing shaft comprises a thread shearing executing shaft and a torque transmission shaft, and the thread shearing drive crank is fixed on the torque transmission shaft; a fixed sleeve is fixed to the right end of the thread shearing executing shaft or the left end of the torque transmission shaft, the fixed sleeve is provided with an axial inner hole, and the left end of the torque transmission shaft or the right end of the thread shearing executing shaft can be slidably inserted into the axial inner hole; the torque transmission shaft or the thread shearing executing shaft is connected with the fixed sleeve through a slide connection structure. The thread shearing drive component and the thread shearing mechanism are few in parts, simple in part structure, convenient to mount, capable of effectively lowering production cost, capable of increasing assembling production efficiency and capable of greatly lowering the risk of getting stuck due to the fact that slide drive force can be allowed to act on the axis of thethread shearing shaft.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a thread trimming drive assembly, a thread trimming mechanism including the thread trimming drive assembly and a sewing machine including the thread trimming mechanism. Background technique [0002] The thread trimming mechanism of the existing sewing machine usually needs to use the thread trimming drive assembly to transmit the torque of the drive shaft, such as the lower shaft of the sewing machine, to the thread trimming shaft. The wire cutter on the drive crank. In the existing implementation cases, the number of parts constituting the thread trimming drive assembly is large, the structure of the parts is relatively complex, the cost is high, and the installation space available for operation is small, which affects the assembly efficiency. Moreover, during the operation, since the action point of the sliding driving force of the thread trimmer driving crank is not ...

AI Technical Summary

Problems solved by technology

In the existing implementation cases, the number of parts constituting the thread trimming drive assembly is large, the structure of the parts is relatively complex, the cost is high, and the installation space available for operation is small, which affects the assembly efficiency

Moreover, during the operation, since the action point of the sliding driving force of the thread trimming drive crank is not on the axis line of the thread trimming shaft, there is a risk of jamming during the driving process

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