Sewing – Stitch forming – Overseaming
Patent
1994-07-28
1996-08-20
Nerbun, Peter
Sewing
Stitch forming
Overseaming
112199, 112200, 112220, D05B 5734
Patent
active
055468780
ABSTRACT:
A looper drive mechanism for a sewing machine includes: two loopers; looper drive shafts for driving the loopers; a main shaft extending across one plane transverse to the looper drive shafts; and torque transmission units for transmitting rotation of the main shaft to the looper drive shafts. The transmission units include: two slant grooved cams fixed to the main shaft and having grooves each extending through a full circumference and slanting relative to the main shaft; U-shaped followers each having two rollers, each of the rollers being supported by the looper drive shaft and rotating about its own axis within the groove of the slant grooved cams; and connection pins for pivotally mounting the U-shaped followers on the looper drive shafts so that the U-shaped followers are not rotatable in a direction in parallel with a line connecting the two rollers with each other but rotatable in a direction perpendicular to the line connecting the two rollers with each other.
REFERENCES:
patent: 2931328 (1960-04-01), Pierce
patent: 3450078 (1969-06-01), Armstead
patent: 4178864 (1979-12-01), Marcandalli
patent: 4599957 (1986-07-01), Marcandalli
patent: 5255622 (1993-10-01), Baba et al.
patent: 5299516 (1994-04-01), Sakuma
Nerbun Peter
Suzuki Manufacturing Co., Ltd.
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