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US4276840A Electronic sewing machine with a feed control device 失效
电子缝纫机配有进给控制装置

Electronic sewing machine with a feed control device
摘要:
A sewing machine which utilizes a pulse motor to vary feed rate in steps is equipped with a microcomputer that causes the pulse motor to operate in a repeated sequence in which two adjacent feed rates are alternated. By operating the computer in accordance with a manually-operable control, an overall feed rate can be produced which is intermediate the two adjacent feed rates.
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