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LOOPER DRIVING DEVICE WITH PERIODICALLY VARIABLE SPEED IN ZIG-ZAG CHAINSTITCH SEWING MACHINES
LOOPER DRIVING DEVICE WITH PERIODICALLY VARIABLE SPEED IN ZIG-ZAG CHAINSTITCH SEWING MACHINES
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机译:锯齿形锯齿缝纫机周期性变化的慢速驱动装置
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摘要
The invention relates to an improved means for driving the looper device of a sewing machine of the type which sews a chain-stitch in a zig-zag pattern. According to the invention, the looper is oscillated respectively at different speeds in mutually perpendicular directions.
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