Importance

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Abstract

A thread cutter for use in a sewing machine with a rotating hook (12) has a surface cam (60) which, together with a cam follower (58), controls the movement path of a pivotable thread catcher lever (26), which grasps the thread with a thread catcher (30, 36) and severs it at a cutter (82). With known solutions the surface cam is seated on the main shaft of the machine, which results in space-consuming structures with a large amount of parts. It is therefore proposed to connect the surface cam (60) in a torsion-proof manner with the hook (12) and to provide arresting means (38) which, only during a revolution of the hook (12) with the needle raised, maintain the thread catcher lever (26) radially outside the engagement range of the surface cam (60) and only with definite triggering release the thread catcher lever (26) with a cam follower (58) for contact with the surface cam (60). The thread cutter therefore has only very few parts and can be housed without problems in the free arm of a sewing machine in a space-saving manner. Preassembly and pre-setting of the thread cutter, which constitutes one unit with the hook, is also possible.

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First Claim