Patent ID: 6912964

Claim:
An oil discharge device of an upper looper mechanism, for preventing soiling of thread or cloth due to scatter of lubricating oil supplied on an upper looper holder from a lubricating device along with ascending and descending motion of the upper looper holder, in the upper looper mechanism of an overlock sewing machine comprising an upper looper base affixed to a sewing machine frame, a circular columnar upper looper holder guide rotatably mounted on the upper looper base, the upper looper holder slidably penetrating through the upper looper holder guide, cooperating with an upper looper shaft coupled by a link mechanism, and ascending and descending while inclining as being guided by the upper looper holder guide, and an upper looper attached to the upper looper holder projecting from the upper looper holder guide, wherein said oil discharge device is characterized in that said upper looper holder guide has an oil discharge hole opened in the periphery of an upper end of a through-hole for passing the upper looper holder, and the lubricating oil is sucked from the opening of the oil discharge hole by a pump driven in cooperation with a sewing machine main shaft, and is collected through the oil discharge hole.