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

IPC: D05B69/22 ,  H02P3/12 ,  H02P7/292 ,  H02P3/06

CPC classification number: D05B69/22 ,  H02P3/12 ,  H02P7/293

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.

公开(公告)号：US3597672A

公开(公告)日：1971-08-03

申请号：US3597672D

申请日：1968-12-30

Applicant: SINGER CO

Inventor： SEESSELBERG HENRY A ,  BECK RICHARD ,  BERNSTEIN BENJAMIN T

IPC: D05B69/18 ,  H02P7/292 ,  H02P3/12

CPC classification number: D05B69/18 ,  H02P7/293

Abstract: An electrical drive system for a sewing machine has a lowinertia DC motor drivingly coupled directly to the main shaft of the sewing machine. The motor is preferably of the type having a single low-inertia low-inductance armature immersed in a field of constant flux. A bridge rectifier using sequentially-fired drivecontrolled rectifiers supplies variable direct current to the armature from a commercial AC source. A fixed rectifier bridge supplies a reference voltage which is controlled by an operatoractuated controller to phase control the firing of the controlled rectifiers to provide running speed control. The armaturegenerated back E.M.F. is used automatically as a speed feedback signal opposed to the reference voltage to provide good speed regulation with respect to load variations. A separate stop controlled rectifier is rendered conductive responsive to a command initiated by the controller to provide dynamic braking of the motor for quickly stopping tee sewing machine.

公开(公告)号：US3505548A

公开(公告)日：1970-04-07

申请号：US3505548D

申请日：1968-11-04

Applicant: SINGER CO

Inventor： SEESSELBERG HENRY A ,  BECK RICHARD

IPC: H02P29/00 ,  F16D27/02

CPC classification number: H02P29/0027 ,  H02P29/0016