Patent ID: 6401640
Filing Date: 2002-06-11
Classification: D05B

Abstract:
A sewing machine comprising:at least one needle which moves up and down at a predetermined stroke penetrating a needle plate while holding a needle thread, and stick into a cloth on the needle plate when falling to catch a looper thread under the needle plate; a looper which projects and withdraws laterally under the needle plate while holding the looper thread and catches the needle thread left at the fall position of the needle when projecting; and a retainer which projects and withdraws backward and forward within a plane under the needle plate roughly in parallel with the needle plate, and crosses the travel path of the looper when projecting rearward to catch the looper thread held by the looper at the projection side of the looper ahead of the needle, wherein the movement timing of the retainer is set so that the condition where the retainer catches the looper thread upon projecting rearward is maintained at least until the tip end of the looper that projects in accordance with the rise of the needle crosses the travel path of the needle.