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：US3609495A

公开(公告)日：1971-09-28

申请号：US3609495D

申请日：1969-12-05

Applicant: SINGER CO

Inventor： SEESSELBERG HENRY A

IPC: H01F7/18 ,  H02H3/247 ,  H02P3/04 ,  H02P3/06

CPC classification number: H01F7/1805 ,  H02H3/247

Abstract: A circuit which does not require mechanical relays is disclosed using silicon-controlled rectifiers (SCR''s) for controlling manually and/or automatically the starting and stopping of a clutch-brake motor having an electromagnetically actuated clutch and brake. Each clutch turnoff brake winding is connected to a source of full wave rectified AC voltage through its own SCR and selective turnoff is effected by capacitor commutation. Momentary overexcitation of both windings is provided by alternative initial discharge therethrough of energy previously stored in respective capacitors. These capacitors are charged through separate individual SCR''s from an AC voltage of a value higher than the normal DC energizing voltage used for continuously exciting the coils. The four SCR''s are turned on in pairs, one SCR of each pair closes a circuit connecting the respective winding to the previously charged capacitor and thereafter to the normal DC energizing bus. Diode gates prevent adverse interaction between the capacitors and the DC bus and provide properly timed energy flow from the DC bus to the winding as soon as the capacitor voltage drops to a value slightly below the bus voltage so that there is no discontinuity in the winding excitation. The trigger pulse which turns on one SCR to energize one winding also turns on the other SCR of the pair, which latter SCR connects the capacitor for charging or storing energy which is later released for initially energizing the other winding. A no-voltage release circuit employs a unijunction transistor (UJT) as a relaxation oscillator connected to a DC supply having a large capacitor. This oscillator provides triggering pulses to the gate of the SCR which controls excitation of the brake winding. Normally, however, with full line voltage, a transistor base-biased to saturation, has its emitter-collector circuit connected across the timing capacitor of the UJT oscillator, thus normally shorting the capacitor and preventing oscillation. Upon failure of line voltage, the transistor turns off due to loss of base bias and the timing capacitor charges from the energy in the large capacitor, and the oscillator supplies a triggering pulse to the SCR for energizing the brake coil. The voltage of the previously charged capacitor now connected to the brake winding will, even in the absence of line voltage, supply a high impulse of energy to the brake coil to bring the load quickly to standstill.

公开(公告)号：US3516526A

公开(公告)日：1970-06-23

申请号：US3516526D

申请日：1968-06-17

Applicant: SINGER CO

Inventor： SEESSELBERG HENRY A

IPC: B60T13/74 ,  F16D48/06 ,  H02H7/00 ,  H02P3/04 ,  H02P29/00 ,  F16D67/06

CPC classification number: H02H7/00 ,  H02P3/04 ,  H02P29/0016

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：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

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