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AssigneePegasus Sewing Machine Mfg. Co., Ltd.
InventorTakashi Kasuda
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In an upper looper holder guide 7 through which an upper looper holder 12 penetrates, a pass hole 25 opened in a spot facing 24, and a groove 26 parallel to the pass hole 25 on the outer circumference of the upper looper holder guide 7 are formed. From the pass hole 25, a first oil discharge hole 27 opened in the edge at the upper end of a through-hole 11 and a second oil discharge hole 28 opened in the groove 26 are branched off, the opening of the first oil discharge hole 27 contacts with the upper looper holder 12, and the opening of the second oil discharge hole 28 and groove 26 are exposed from a longitudinal hole 6 of an upper looper base 4 when the upper looper holder 12 reaches the top dead center or the bottom dead center. A passage hole 39 formed in a frame 2 is opened in an oil wick 29 made of felt fitted in the spot facing 24 of the upper looper holder guide 7, and is connected to a first pump body 33 of an oil discharge device composed of a two-layer trochoid pump, and oil is discharged by force by way of the first and second oil discharge holes 27, 28, while thread or cloth is not soiled due to scattering of lubricating oil above the upper looper holder by ascending or descending motion of the upper looper holder 12.
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 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 caracterized 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.
Dependencies are inferred from the claim text.