发明名称 |
Pneumatic speed control for an electric sewing machine |
摘要 |
A motor controller for an electric sewing machine mounted in a removable portion of the housing of the machine. The controller is actuatable by a pneumatic switch which successively closes a plurality of contacts as the air pressure to the switch is increased to enable the speed of the motor to be increased smoothly and gradually without sparking at the contacts.
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申请公布号 |
US4261273(A) |
申请公布日期 |
1981.04.14 |
申请号 |
US19770862981 |
申请日期 |
1977.12.21 |
申请人 |
MEFINA S.A. |
发明人 |
MATTHEY, JACQUES;TORRE, MARCEL |
分类号 |
D05B69/18;H02P7/292;(IPC1-7):D05B69/10;D05B69/14 |
主分类号 |
D05B69/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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