JPS6161977U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of this invention, and FIG. 2 is an explanatory view of the main parts showing the relationship between the first cam and the thread cutting shaft drive arm. 1... Hook shaft, 3... Clutch body, 4... First cam, 9
...Thread cutting shaft, 15...Movable blade, 16...Fixed blade, 17
...Thread cutting shaft drive arm.

Claims (1)

[Scope of claim for utility model registration] A hook shaft that rotates in conjunction with the main shaft, and a hook that is loosely fitted to the hook shaft and is interlocked with the hook shaft by movement in one direction along the axis of the hook shaft, and interlocked with the hook shaft by movement in the opposite direction. a clutch body for releasing the thread, a thread trimming shaft rotatably supported on the machine frame in parallel with the shuttle shaft, a thread trimming shaft drive arm fixed to the thread trimming shaft, a fixed blade fixed to the machine frame, and a thread cutting shaft rotatably supported on the machine frame. A movable blade supported on the machine frame is movable in conjunction with the rotation of the cutting shaft between a position where it slides into contact with the fixed blade and cuts the sewing thread, and a thread handling position where it is separated from the fixed blade and captures the sewing thread. A spring acts on the thread trimming shaft to move the movable blade to a position where it comes into sliding contact with the fixed blade, and a spring works in conjunction with the clutch body and loosely fits on the hook shaft.
A thread cutting device for a sewing machine comprising a first cam that contacts a thread cutting shaft drive arm so as to separate the movable blade from the fixed blade.