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1.发明授权System for controlling needle positioning drive and thread trimming functions of an industrial sewing machine driven by a continuously coupled dc motor 失效连续式直流电动机驱动的工业缝纫机的针定位驱动和螺纹切割功能的控制系统
公开(公告)号：US3573581A
公开(公告)日：1971-04-06
申请号：US3573581D
申请日：1969-06-24
Applicant: SINGER CO
Inventor： DUTKO JOHN J , BECK RICHARD , SEESSELBERG HENRY A
Abstract: Solid-state digital logic circuitry with gates, memory flipflops, delay and sensor elements provide a logic system for controlling the drive and braking currents to a DC motor continuously coupled in driving relation to a sewing machine. In response to certain input commands, a series of events are signaled by the logic circuitry to occur automatically in a predetermined time sequence resulting in a desired output sewing related function. Silicon controlled rectifiers (SCR''s) are used to supply driving current to the motor from a polyphase voltage supply. A single SCR is used to supply dynamic braking current for the motor. The single SCR is turned off to terminate a first braking period when a solid-state switch operates responsively to a speed sensor to reduce the SCR current below its holding value.
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2.发明授权Inhibit trigger circuit to prevent simultaneous conduction of controlled rectifiers due to improperly spaced command signals 失效禁止触发电路，以防止由于不正确的空间命令信号同时导致受控整流器的导通
公开(公告)号：US3544874A
公开(公告)日：1970-12-01
申请号：US3544874D
申请日：1969-01-21
Applicant: SINGER CO
Inventor： DUTKO JOHN J , SEESSELBERG HENRY A
IPC: H02P3/12 , H02P7/292 , H03K17/72 , H03K17/725
CPC classification number: H03K17/72 , H02P3/12 , H02P7/293 , H03K17/725
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