US3860860A - Motion control system for direct current motors, particularly in sewing machine uses - Google Patents

Motion control system for direct current motors, particularly in sewing machine uses Download PDF

Info

Publication number
US3860860A
US3860860A US347498A US34749873A US3860860A US 3860860 A US3860860 A US 3860860A US 347498 A US347498 A US 347498A US 34749873 A US34749873 A US 34749873A US 3860860 A US3860860 A US 3860860A
Authority
US
United States
Prior art keywords
motor
braking
signal
speed
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US347498A
Other languages
English (en)
Inventor
Robert J Moran
Constantine J Pateuk
Larry M Leblanc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kollmorgen Corp
Original Assignee
Photocircuits Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Photocircuits Corp filed Critical Photocircuits Corp
Priority to US347498A priority Critical patent/US3860860A/en
Priority to GB1230474A priority patent/GB1436913A/en
Priority to DE2415042A priority patent/DE2415042A1/de
Priority to CH443974A priority patent/CH574185A5/xx
Priority to AT259374A priority patent/AT332489B/de
Priority to FR7411400A priority patent/FR2224921A1/fr
Priority to JP49038713A priority patent/JPS5030011A/ja
Priority to IT50016/74A priority patent/IT1004076B/it
Application granted granted Critical
Publication of US3860860A publication Critical patent/US3860860A/en
Assigned to KOLLMORGEN CORPORATION, A CORP. OF NY reassignment KOLLMORGEN CORPORATION, A CORP. OF NY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOLLMORGEN TECHNOLOGIES CORPORATION, A TX CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a DC motor
    • H02P3/12—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a DC motor by short-circuit or resistive braking
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position
    • D05B69/26—Devices for stopping drive when sewing tools have reached a predetermined position with automatic means to reduce speed of drive, e.g. in one or more steps

Definitions

  • ABSTRACT A motion control system for the direct current motor of a sewing machine wherein an external brake applies a retarding force to the motor and the sewing machine needle mechanism once the motor has reached a predetermined essentially stable level. Braking is controlled by monitoring the emf or current of the motor when it is in a dynamic braking mode and by initiating stabilized speed control of the motor when the emf or current obtains a predetermined level. The external brake thereafter is energized upon occurrence of a signal representing the arrival of the needle mechanism at a predetermined location in the needle cycle.
  • sorrom stab has CONTROL F/F 5 BRAKING 47 s R MOTION CONTROL SYSTEM FOR DIRECT CURRENT MOTORS, PARTICULARLY IN SEWING MACHINE USES BACKGROUND OF THE INVENTION
  • Our invention relates to motion control of direct current motors of the type used in sewing machines and the like. It specifically concerns an improved motion control system wherein the parameter of motor current or motor emf is used to control the motor. such as by using auxiliary braking means to bring the motor to a predictable stop from a controlled intermediate speed level.
  • Control of industrial type sewing machines places stringent demands upon the machine's electrical control system.
  • the sewing machine drive is subjected to continuously varying loads, and the speed of the sewing machine must be capable of continuous control by the operator, preferably being infinitely variable over the operating range.
  • the speed of the sewing machine must be capable of continuous control by the operator, preferably being infinitely variable over the operating range.
  • a further complicating factor may reside in the use of silicon controlled rectifiers for short circuiting the direct current motor during dynamic braking.
  • a special purpose circuit must be incorporated in this case just to release dynamic braking at the end of the first braking period. This is because the SCR tends to continue conducting until the current through it is nearly extinguished.
  • Another object of the invention is to provide a sim ple, reliable and low cost sewing machine control system which gives positive and accurate control of the motor and the sewing machine mechanism.
  • Another object of the invention is to join compatibly the dc motor drive signal developed from rectifying a continuously variable alternating current signal with a sewing machine motion control system using an intermediate speed regulated drive.
  • the dynamic braking current is used to detect a predetermined desired motor speed, and the motor speed thereafter is regulated by a current regulating device in series with the motor.
  • the motor is put into the dynamic braking mode by disconnecting the normal variable direct current source from the motor terminals and connecting the motor terminals to the braking control system. Series current regulation of the motor continues until the needle mechanism reaches a predetermined position, at which time external braking means is brought into play to stop the motor from a known velocity in a prescribed time and travel distance.
  • the dynamic braking current is used to develop a variable signal which, when added to a fixed voltage reference, provides a control signal for regulating the motor during the speed stabilized mode.
  • FIG. 1 is a schematic diagram of a motor control system in accordance with the invention.
  • FIG. 2 is a series of graphs, A-I, of representative waveforms and functions at various points in the system of FIG. 1.
  • a high torque, low inertia direct current motor 10 is excited, during normal operation, through a switch 12 from a conventional full wave bridge 14.
  • the bridge is excited by a continuously variable alternating current source provided by the variable transformer 15.
  • This variable transformer includes a movable slider 16 mechanically coupled to the operator's treadle 18 of the sewing machine, as is indicated by the dashed line.
  • the autotransformer I5 is supplied by an alternating current source from the line, e.g., 220 volts/6O Hz. applied across the transformer terminals 17a, 17b. As the operator depresses the treadle, a continuously increasing alternating current voltage appears at the movable contact 16 and therefore at the input to the full wave bridge 14. A full wave rectified signal thus drives the motor 10 in a forward direction.
  • a motor drive circuit of this type is disclosed in the co-pending application of Moran et al. for Sewing Machine Drive Control", Ser. No. 259,171, filed June 2, 1972 and assigned to the assignee of this invention.
  • the waveform applied to the motor terminals by the normal drive circuit can be seen from FIG. 2D, illustrating the qualitative nature of the motor drive signal as the operator completely releases the treadle pressure.
  • the motor terminal voltage includes the back emf (the dashed line) upon which is superimposed the full wave rectified voltage from the bridge 14.
  • the system is put into the braking mode when the operator releases pressure on the sewing machine treadle.
  • the contact 16 ofthe variable transformer is shorted to the terminal 17b and thus essentially reduces to zero the applied ac signal, as already observed in FIG. 2D.
  • the movable contact 13 of the switch 12 moves from the normally closed position to make contact with the terminal 20, thereby connecting the motor to the motion control system for the sewing machine needle mechanism (the mechanism itself not being shown).
  • the motor is conditioned for both (a) dynamic braking; and (b) receiving regulated current to drive themotor at a controlled predetermined intermediate speed.
  • Motor velocity during all operating modes is depicted in FIG. 2A, region (0) in that curve being the decelerating motor speed contour during normal drive as the treadle returns to its rest positlon.
  • Braking operation is automatically initiated in order to bring the sewing machine needle mechanism to a halt with the needle in the full down position, when the treadle is released.
  • Braking occurs in three steps: (1) dynamic deceleration from existing speed to a predetermined plateau velocity (see region (I) of FIG. 2A); (2) constant speed operation at the plateau velocity until the needle mechanism arrives at a preselected location in'its cycle (region (2)); and (3) combined dynamic and external braking to bring the motor to a complete stop (region (3) of FIG. 2).
  • a command is given and the machine drives from the bottom stop to the top (needle up) stop automatically by accelerating to the plateau velocity and, thereafter. being braked to a complete stop by dynamic and external braking.
  • the latter mode takes place in regions (4) and (5) of FIG. 2A.
  • Dynamic braking is accomplished by connecting the motor in a low impedance series current path comprised of the low impedance resistance 22 and the nominal impedance of the emitter-collector path of the switching transistor 24.
  • the transistor 24 is turned on by an appropriate signal supplied to the transistor base via the amplifier 25. This signal is developed by the braking circuit comprised in part of the flip-flop pulse generator 27, which is totally responsive to speed-representative and positionrepresentative signals.
  • the short circuit current i.e., the dynamic braking current
  • This voltage is compared in the comparator 30 with a reference voltage applied to the amplifier 31.
  • the output of the differential comparator 30 goes low to induce a pulse (FIG. 2E) at the output of the negative edge detector 33.
  • This latter pulse rep resents the motor's obtaining the preselected speed level and is fed through an OR gate 35 to the set (S) input of the braking control flip-flop 27, the eby driving the set (0) output high and the reset (0) output low.
  • the current in the dynamic braking resistor 22 is illustrated in FIG. 2C, with the corresponding position of the mode switch 12 being shown in FIG. 28. Rapid deceleration of the motor due to dynamic braking is clearly seen to occur in region (1) of the graph of FIG. 2A.
  • the braking cot t trol flip-flop 27 Since the braking cot t trol flip-flop 27 is normally in the reset condition, its 0 output is normally high. This condition causes an enabling signal to be applied to the amplifier 25 to turn on the transistor 24. Thus, when the treadle is released by the sewing machine operator, dynamic braking results from the short circuiting of the motor through the resistive impedance 22.
  • Dynamic braking continues until the voltage across the resistor 22 is equal to the set reference voltage 31, causing the pulse in FIG. 2E to fall. This negative falling edge is sensed by the detector 33 and results in a pulse (34 in FIG. 1) which sets the flip-flop 27.
  • This sequence drives the Q output of the unit 27 high so as to enable a speed control regulating device while at the same time causing the transistor switch 24 to turn off.
  • the 0 output is applied via the amplifier 38 to the base of a current regulating transistor 40, the collector of the latter being connected to an appropriate direct current source +V.
  • the circuit transfers to operation in the region (2) of FIG. 2A, wherein the motor is held at a constant, or plateau, velocity until such time as a position pulse is sensed.
  • Speed regulation is accomplished as follows.
  • SPEED REGULATION Speed regulation occurs in regions 2 and 4 of FIG. 2A by supplying a regulated current to the motor through the transistor 40.
  • the amplifier 42 is active and amplifies the voltage across the resistor 22.
  • the gain of amplifier 42 is chosen such that the voltage applied to the anode of the zener diode 44 equals the i R (armature) voltage drop in the motor.
  • the signal presented to the motor via the transistor 40 and the diode 45 is thus set by the zener diode and the i Ra drop in the motor.
  • the absolute value of the motor speed is set by the zener voltage.
  • a small forward bias is set on the transistor 40 by the resistors 47, 48.
  • the transistor 40 continues to conduct until the flipflop 27 is reset. Throughout this period, therefore, the motor drives under such torque as is necessary to maintain constant speed until the needle mechanism arrives at a known position.
  • POSITIONAL STOP CONTROL Position pulses are generated in order to give a positional reference for the initiation of the final braking step region (3) in FIG. 2A.
  • an irregularly shaped ferromagnetic cam 50 rotating with the needle mechanism and cooperating with the reluctance pick off coil 52, generates pulses each time the lobes of the cam pass the pick off point. Those pulses are of the opposite polarities (FIG. 2F) and are applied to respective amplifiers 54, 55.
  • the outputs of the amplifiers are gated in the AND gates 57, 58 with gating signals from the position selector flip-flop 60.
  • the AND gate outputs are applied via the OR gate 62 to the reset (R) input of the braking control flip-flop 27.
  • the bottom stop (needle down) position is desired as the final needle position. That is, the Q output of the flip-flop 60 is normally high, allowing only the pulses passing to the AND gate 57 to be passed on to the braking control circuit 27. Accordingly, unless overridden by the operator, the needle will be brought to stop in the down position as a result of the flip-flop 60 normally being in the reset condition.
  • the braking control pulse generating unit 27 normally in the reset condition, becomes set (for normal operation) whenever motor speed drops below a pre-selected level. As long as motor speed remains above this level, the output of the voltage comparator 30 is high (FIG. 2E), and a pulse is applied to the set (S) input of the flip-flop 27 only upon extinction of the high level output of the comparator 30.
  • the flipflop 27 output (FIG. 2G illustrating Q output thereof) then commands regulated speed operation, region (2), until such time as the needle mechanism arrives at a predetermined location. This results in the generation of a position pulse applied to the reset (R) input of the flip-flop 27, extinguishing the enabling pulse to the speed regulator and again instituting dynamic braking in region (3) of FIG. 2.
  • braking is supplemented by an external brake, such as the electromechanical brake represented by the amplifier 70, brake energizing solenoid 72 and the braking armature 73.
  • an external brake such as the electromechanical brake represented by the amplifier 70, brake energizing solenoid 72 and the braking armature 73.
  • brakes may be used satisfactorily with the invention, such as of the eddy current, magnetic particle positive mechanical detent types, etc.
  • the braking unit 70-73 is brought into operation through detection of the trailing edge of the set (Q) output of the flip-flop 27.
  • a trailing edge detector 75 which may be a differentiator, for example, accepts the Q output of the circuit 27; the detector output in turn triggers a one-shot pulse generator 76 to produce the waveform of FIG. 2H.
  • the external brake is energized.
  • a command is given by moving one of the controls on the sewing machine, usually a kneeoperated lever 77. This applies a signal (FIG. 21) to the set (S) input of the needle position flip-flop 60, the top stop selector switch being shown schematically by the switch 78 in FIG. 1.
  • This same command is applied through the amplifier 80 directly to one of the inputs of the OR gate 35 and, thence, to the set input of the flip-flop 27.
  • This immediately sets the flip-flop and places the system in the driven mode illustrated as region (4) in FIG. 2.
  • the motor is operated for a period of time sufficient to bring the needle mechanism to a position where it can be stopped in the full up location.
  • the condition of the Q and O outputs changes to remove the gating signal from the AND gate 57 and to enable the AND gate 58, allowing the top stop position pulses (FIG. 2H negative pulse) to pass to the OR gate 62 and thence to the R input of the flip-flop 27.
  • the motor thus continues to drive until such time as the needle reaches the proper top location, thereupon extinguishing the pulse at the Q output the flip-flop 27 and generating a braking pulse at the output of the oneshot 76.
  • the system then enters the external braking region (5) illustrated in FIG. 2.
  • a further advantage of the invention is obtained as a result of the function switch 12, which removes the normal drive source from the motor during the position control sequence.
  • This makes possible to use of the separate current regulating circuit, including the transistor 40, without having to disable in some manner the normal drive circuitry.
  • this approach appears to result in a duplication of circuits, it in fact results in a great simplification.
  • both positive and negative pulse logic can be used and numerous types of devices for developing position pulses and for applying external braking forces are available to those in the art and are well known.
  • the invention is not limited to any particular type of direct current motor, and any high response low inertia dc motor will provide satisfactory performance.
  • the U 12 M4H motor available from the PMI Division of Kollmorgen Corporation, Glen Cove, New York is one such motor in this category which is satisfactory for use in the invention.
  • a braking control system for a dc motor adapted for energization by an external power source comprismg:
  • braking control means responsive to the speed representative signal for energizing the external braking means at a time when the motor attains a given speed level.
  • a motion control system for a sewing machine having a needle mechanism driven by a dc motor comprising:
  • a braking circuit including means for connecting the motor to a series current path during braking operation thereof;
  • a brake control circuit jointly responsive to the position signal and to the dynamic braking motor current in said series current path for energizing the braking means so as to stop the needle mechanism at a predetermined position during braking operation of the system.
  • the series current path includes a low dc impedance and the brake control circuit responds in part to the voltage signal developed across said impedance.
  • the braking circuit includes a switch operable to apply the dc drive signal during normal operation and to disconnect the motor from the dc signal while connecting said motor to the series current path during braking operation.
  • the braking circuit includes switch'means connected serially in the series current path and responsive to the brake control circuit for obtaining dynamic braking of the motor during selected portions of the braking operation.
  • a motor control system for a sewing machine having a needle mechanism driven by a d.c. motor comprising:
  • a braking circuit including switch means for connecting the motor to a series current path during braking operation thereof for obtaining dynamic braking of the motor during selected portions of the braking operation;
  • braking means for applying a retarding force to the needle mechanism
  • a speed control drive circuit for applying a d.c. drive signal to the motor fora selected period of time during braking operation
  • a brake control circuit jointly responsive to the position signal and to the motor current in said series current path during braking operation for energizing the braking means so as to stop the needle mechanism at a predetermined position.
  • the speed control drive circuit is controlled by the brake control circuit so as to be operable when the motor speed obtains a predetermined level.
  • the speed control drive circuit is operable to drive the motor with a preselected torque.
  • a regulator for applying a variable dc current signal to the motor in response to a variable control signal
  • variable control signal means for generating the variable control signal, said signal having a first signal component variable in accordance with motor speed variations and a second signal component which is essentially constant in value.
  • reference potential means connected intermediate the speed responsive means and said regulator for developing the second signal component
  • the speed control drive circuit is responsive to the position signal so as to be rendered inoperable when the motor has obtained said predetermined level and the needle mechanism, while in motion, reaches a preselected position.
  • the brake control circuit energizes the braking means upon cessation of operation of the speed control drive circuit.
  • the braking means is responsive to an electrical signal; and the brake control circuit generates an electrical signal having a predetermined duration so as to operate the braking means for a corresponding period of time.
  • the brake control circuit comprises a pulse generator operable to produce an electrical control pulse when the motor exceeds a predetermined speed level, the braking circuit switch means being responsive to the control pulse so as to effect dynamic braking for the duration thereof.
  • the position signal comprises at least one signal generated each time the needle mechanism arrives at a predetermined position in a needle motion cycle; and the brake control circuit pulse generator generates an enabling signal for the speed control drive circuit, the generator being operative to initiate the enabling pulse upon cessation of the electrical control pulse and to extinguish the enabling pulse upon the occurrence of a position pulse. 17.
  • the brake control circuit comprises a pulse generator operable to produce an electrical control pulse when the motor exceeds a predetermined speed level, the braking circuit switch means being responsive to the control pulse so as to effect dynamic braking for the duration thereof.
  • the position signal comprises at least one additional signal separated in time from the first position signal, the pulse generator responding to such other position signal so as to extinguish the enabling signal initiated by the needle command, thereby to stop the needle mechanism in a second predetermined position.
  • a motor control system for a sewing machine comprising:
  • a direct current low inertia motor for driving the mechanism; a source of variable direct current for energizing said motor during normal operation; a direct current impedance controllable between a high impedance value and a low impedance value sufficient to dynamically brake the motor;
  • controllable motor drive circuit for providing a source of direct current to run said motor at a reduced speed during selected portions during braking operation of the sewing machine
  • a switch connecting the motor to said variable direct current source during normal operation and, during braking operation, for disconnecting the motor from said variable direct current source while connecting the motor to a first series current path in cluding said controllable impedance and to a second series current path including said controllable motor drive circuit;
  • control circuit responsive to the dynamic braking current in said motor during braking operation for altering said impedance from a low value to a high value when the motor speed is reduced to a desired level, and for bringing said controllable motor drive circuit into operation once said impedance is of high value.
  • control circuit being also responsive to said position signal so as to terminate operation of said drive circuit upon occurrence thereof, whereby said motor, during braking operation, is first dynamically braked and then is controllably run at reduced speed until the needle attains a predetermined location.
  • electromechanical braking means responsive to said position signal for applying an external retarding force to the motor so as to stop the needle at a desired predetermined position.
  • a low inertia d.c. motor control system comprismeans responsive to a braking command for short circuiting the motor through a current path having a low impedance
  • a current control device in series with the motor to provide a variable current to the motor from a direct current source in response to a variable speed regulation signal during a period of time when said dynamic braking is not effective

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Stopping Of Electric Motors (AREA)
  • Control Of Direct Current Motors (AREA)
US347498A 1973-04-03 1973-04-03 Motion control system for direct current motors, particularly in sewing machine uses Expired - Lifetime US3860860A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US347498A US3860860A (en) 1973-04-03 1973-04-03 Motion control system for direct current motors, particularly in sewing machine uses
GB1230474A GB1436913A (en) 1973-04-03 1974-03-20 Motion control syem for direct current motors particularly in sewing machine uses
DE2415042A DE2415042A1 (de) 1973-04-03 1974-03-26 Steuerung von gleichstrommotoren fuer naehmaschinen oder dergleichen
AT259374A AT332489B (de) 1973-04-03 1974-03-29 Steuereinrichtung zur stillsetzung eines gleichstrommotors in einer festgelegten winkelstellung der ankerwelle, insbesondere fur einen nahmaschinenantrieb
CH443974A CH574185A5 (enrdf_load_stackoverflow) 1973-04-03 1974-03-29
FR7411400A FR2224921A1 (enrdf_load_stackoverflow) 1973-04-03 1974-03-29
JP49038713A JPS5030011A (enrdf_load_stackoverflow) 1973-04-03 1974-04-03
IT50016/74A IT1004076B (it) 1973-04-03 1974-04-03 Sistema di controllo del movimen to in motori a corrente continua particolarmente in quelli usati per macchine da cucire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US347498A US3860860A (en) 1973-04-03 1973-04-03 Motion control system for direct current motors, particularly in sewing machine uses

Publications (1)

Publication Number Publication Date
US3860860A true US3860860A (en) 1975-01-14

Family

ID=23363940

Family Applications (1)

Application Number Title Priority Date Filing Date
US347498A Expired - Lifetime US3860860A (en) 1973-04-03 1973-04-03 Motion control system for direct current motors, particularly in sewing machine uses

Country Status (8)

Country Link
US (1) US3860860A (enrdf_load_stackoverflow)
JP (1) JPS5030011A (enrdf_load_stackoverflow)
AT (1) AT332489B (enrdf_load_stackoverflow)
CH (1) CH574185A5 (enrdf_load_stackoverflow)
DE (1) DE2415042A1 (enrdf_load_stackoverflow)
FR (1) FR2224921A1 (enrdf_load_stackoverflow)
GB (1) GB1436913A (enrdf_load_stackoverflow)
IT (1) IT1004076B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969661A (en) * 1973-08-20 1976-07-13 Hitachi, Ltd. Motor control apparatus
US4011490A (en) * 1974-03-29 1977-03-08 Heinz Daab Apparatus for immobilizing a working shaft at a predetermined angular position
US4137860A (en) * 1977-02-18 1979-02-06 Brother Kogyo Kabushiki Kaisha Electrical drive system for a sewing machine
EP0005079A1 (en) * 1978-04-25 1979-10-31 The Rank Organisation Limited An electric motor control circuit
US4364001A (en) * 1979-09-25 1982-12-14 Frankl & Kirchner Gmbh & Co. Kg Fabrik Fur Elektromotoren U. Elektrische Apparate Circuit arrangement for energy economy
US4396876A (en) * 1980-04-15 1983-08-02 Olympus Optical Co., Ltd. Motor control apparatus
US4600865A (en) * 1984-10-29 1986-07-15 Westinghouse Electric Corp. Transportation apparatus
US20090215299A1 (en) * 2008-02-27 2009-08-27 Cooper Technologies Company Two-material separable insulated connector
US20170275799A1 (en) * 2016-03-28 2017-09-28 Hsuan-Tai CHEN Closed-loop control device of a mechanical sewing machine and method for controlling the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5247129B2 (enrdf_load_stackoverflow) * 1973-05-09 1977-11-30
JPS5523711B2 (enrdf_load_stackoverflow) * 1973-07-25 1980-06-24
US4291739A (en) * 1979-08-16 1981-09-29 Eduard Baur Method of manufacturing a hollow casting mold
DE3422351A1 (de) * 1983-06-16 1984-12-20 Canon K.K., Tokio/Tokyo Bilderzeugungssystem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3466524A (en) * 1966-07-06 1969-09-09 Gen Electric Speed taper brake modulation system
US3506862A (en) * 1966-07-15 1970-04-14 Japan National Railway Dynamic and eddy current railway brake device
US3715642A (en) * 1971-06-21 1973-02-06 Singer Co Dc control circuits for direct drive motors continuously coupled to sewing machines for controlling sewing functions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3466524A (en) * 1966-07-06 1969-09-09 Gen Electric Speed taper brake modulation system
US3506862A (en) * 1966-07-15 1970-04-14 Japan National Railway Dynamic and eddy current railway brake device
US3715642A (en) * 1971-06-21 1973-02-06 Singer Co Dc control circuits for direct drive motors continuously coupled to sewing machines for controlling sewing functions

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969661A (en) * 1973-08-20 1976-07-13 Hitachi, Ltd. Motor control apparatus
US4011490A (en) * 1974-03-29 1977-03-08 Heinz Daab Apparatus for immobilizing a working shaft at a predetermined angular position
US4137860A (en) * 1977-02-18 1979-02-06 Brother Kogyo Kabushiki Kaisha Electrical drive system for a sewing machine
EP0005079A1 (en) * 1978-04-25 1979-10-31 The Rank Organisation Limited An electric motor control circuit
US4364001A (en) * 1979-09-25 1982-12-14 Frankl & Kirchner Gmbh & Co. Kg Fabrik Fur Elektromotoren U. Elektrische Apparate Circuit arrangement for energy economy
US4396876A (en) * 1980-04-15 1983-08-02 Olympus Optical Co., Ltd. Motor control apparatus
US4600865A (en) * 1984-10-29 1986-07-15 Westinghouse Electric Corp. Transportation apparatus
US20090215299A1 (en) * 2008-02-27 2009-08-27 Cooper Technologies Company Two-material separable insulated connector
US20170275799A1 (en) * 2016-03-28 2017-09-28 Hsuan-Tai CHEN Closed-loop control device of a mechanical sewing machine and method for controlling the same
US10563332B2 (en) * 2016-03-28 2020-02-18 Hsuan-Tai CHEN Closed-loop control device of a mechanical sewing machine and method for controlling the same

Also Published As

Publication number Publication date
FR2224921A1 (enrdf_load_stackoverflow) 1974-10-31
IT1004076B (it) 1976-07-10
JPS5030011A (enrdf_load_stackoverflow) 1975-03-26
CH574185A5 (enrdf_load_stackoverflow) 1976-03-31
DE2415042A1 (de) 1974-10-24
ATA259374A (de) 1976-01-15
GB1436913A (en) 1976-05-26
AT332489B (de) 1976-09-27

Similar Documents

Publication Publication Date Title
US3860860A (en) Motion control system for direct current motors, particularly in sewing machine uses
US3573581A (en) System for controlling needle positioning drive and thread trimming functions of an industrial sewing machine driven by a continuously coupled dc motor
US5049793A (en) Method of controlling V/F inverter for machines having mechanical braking systems
US3715642A (en) Dc control circuits for direct drive motors continuously coupled to sewing machines for controlling sewing functions
US4014277A (en) Control apparatus for sewing machine with automatic needle stopping means
US2767363A (en) Limit-stop control system
US3894277A (en) Control device for the commutatorless motor
US3352396A (en) Drive and stop control for a driven machine
US4765267A (en) Sewing machine drive device
US3969661A (en) Motor control apparatus
US4491197A (en) Speed control apparatus for A.C. elevator car drive motor
US3965403A (en) Constant power control of a D.C. electric motor for handling cargoes
US4416352A (en) Elevator system
US3189811A (en) Braking circuits for d. c. motors
US3947737A (en) Gate control of thyristor converters for reversibly driving a D.C. electric motor
US3123757A (en) gaudet
US3845366A (en) Integrated drive system
US3706020A (en) Capstan motor control system
US3908156A (en) Induction motor speed control apparatus
US3921046A (en) Elevator speed control apparatus
US3424959A (en) Split phase induction motor solid state position control with braking at balance
US3931562A (en) Electric driving arrangement using a stepping motor
US4161919A (en) Motor control system for sewing machine
US2393662A (en) Control system for welding heads
US3759350A (en) Elevator system

Legal Events

Date Code Title Description
AS Assignment

Owner name: KOLLMORGEN CORPORATION, A CORP. OF NY, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOLLMORGEN TECHNOLOGIES CORPORATION, A TX CORP.;REEL/FRAME:005356/0276

Effective date: 19900615