US3670975A - Constant tension controller device for winder - Google Patents

Constant tension controller device for winder Download PDF

Info

Publication number
US3670975A
US3670975A US876284A US3670975DA US3670975A US 3670975 A US3670975 A US 3670975A US 876284 A US876284 A US 876284A US 3670975D A US3670975D A US 3670975DA US 3670975 A US3670975 A US 3670975A
Authority
US
United States
Prior art keywords
phase
output
main control
control means
voltage
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
US876284A
Other languages
English (en)
Inventor
Yoshio Tomimatsu
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3670975A publication Critical patent/US3670975A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/385—Regulating winding speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • a constant tension controller device for a winder which comprises a differential transformer for generating an output voltage in response to a vertically movable roller moved up and down according to the tension of a yarn, and a tacho-generator connected with a three-phase induction motor for driving a spool for rotation, whereby electric current in one of three power lines of the three-phase induction motor is controlled by a thyrister as a function of the difference between the output voltage of the tacho-generator and the output voltage of the diflerential transformer so that the yarn of nylon or like material are wound on the spool with a constant tension,
  • This invention generally relates to a constant tension controller device for a winder, and more particularly to a constant tension controller device for a winder which is used to wind on a spool a very thin yarn of nylon, silk or like material in chemical fiber plants or spinning mills, and in which the output voltage of a differential transformer is varied by a vertically movable roller moved up and down by the tension of the yarn so that one of the three phases of a three-phase induction motor is quantitatively controlled by the difference between the output voltage of a'tacho-generator connected with the threephase induction motor and the output voltage of the
  • FIG. 4 of the accompanying drawings An example of the construction of the conventional constant tension controller device for a winder is shown in FIG. 4 of the accompanying drawings.
  • the shown example of the conventional construction includes a speed setting auto-transformer 1 connected with a single-phase power source, a twophase motor 2 connected with the speed setting auto-transformer 1 through a phase-shifting capacitor 3 or the main winding 5 of a saturable reactor 4, a spool 6 driven by the twophase motor 2, a yarn 7 to be wound on the spool 6 by means of a fixed roller 8 and a vertically movable roller 9 which is pivotally attached to a supporting point 10 by means of an arm 11, a differential transformer 12 having its voltage varied with the displacement of the vertically movable roller 9, and a rectifier 13 for rectifying the voltage of the differential transformer 12.
  • the saturable reactor 4 has a control winding 14 for controlling the flow of the current passing to the main winding 5 of the saturable reactor 4 in accordance with the output voltage of the rectifier 13.
  • the yarn 7 fed at a predetermined speed via the fixed roller 8 and vertically movable roller 9 is wound on the spool 6 driven by the two-phase motor 2.
  • any variation in the tension of the yarn 7 which may result from the swollen turns of the yarn on the spool or from any other extraneous force is converted into a voltage by the differential transformer 12 directly connected with the vertically movable roller 9 and the voltage is introduced into the control winding 14 of the saturable reactor 4 so that the output of the saturable reactor 4 becomes smaller as the yarn tension increases.
  • the rotational speed of the two-phase motor 2 is lowered to reduce and control the yarn tension at a predetermined level.
  • the two-phase motor 2 connected with the single phase power source is driven through the phase-shifting capacitor 3 as in the arrangement shown in FIG. 4, it is difficult to attain smooth control of the motor speed by using only one capacitor of this kind because another suitable capacitor is required for a different rotational speed of the motor.
  • the two-phase motor may be driven from a three-phase power source through a T- connection transformer, but such an arrangement is disadvantageous in that the T-connection transformer is required and the power source must be large in size and sophisticated in construction thereby leading to a higher cost for the entire arrangement.
  • V-connection three-phase motor connected with a three-phase power source in which one phase of the V-connection, is controlled; however such a V-connection motor is larger in size and more complicated in construction for the same output than the ordinary Y-connection motor or A-connection motor.
  • the present invention consists in inserting a main control means in one phase of a three-phase power source for con trolling the flow of current to be passed, connecting a threephase induction motor to the three-phase power source, comparing the output voltage of a differential transformer and the output of a tacho-generator in accordance with the variation in the tension of a yarn, varying the flow of current passing to the main control means in accordance with the degree of yarn tension, thereby controlling the number of revolutions of the three-phase induction motor and controlling the yarn tension at a predetermined level.
  • FIG. 1 is a schematic diagram showing the constant tension controller device for a winder according to an embodiment of the present invention
  • FIG. 2 shows the electrical circuit of the constant tension controller device shown in FIG. 1;
  • FIG. 3 is a graph for illustrating the relationship between the number of revolutions and torque characteristic of the threephase induction motor used with the present invention
  • FIG. 4 is a schematic diagram showing the constant tension controller device for a winder according to the prior art.
  • FIG. 5 is a partial electrical circuit of another embodiment of the present invention.
  • an embodiment of the present invention includes a spool 6, a yarn 7, a fixed roller 8, a vertically movable roller 9, a supporting portion 10, an arm 11, a differential transformer 12 and a rectifier 13, all these being conventional and similar to those shown by like numerals in FIG. 4.
  • the difierential transformer 12 may be replaced by a synchro.
  • the embodiment of the present invention further includes a three-phase induction motor 15 connected to a threephase voltage regulator 16, and a main control means 17 for controlling the input current of one phase of the three-phase induction motor main control means 17 may comprise semi-conductor elements such as thyristor or transistor which would reduce the size and improve the reliability and life.
  • a tacho-generator 18 is directly connected with the three-phase induction'motor 15 and the voltage generated by the tachogenerator 18 is applied to the main control means 17 through a rectifier 19.
  • a continuous thin yarn 7 of nylon or like material is wound on the rotating spool 6 and the diameter of the turns formed by the wound yarn on the spool 6 gradually increases as the winding operation progresses.
  • the tension of the thin yarn to be wound on the spool 6 is varied with the variation in the voltage applied to the three-phase induction motor 15 or with any extraneous mechanical factor. If the tension of the thin yarn 7 to be wound on the spool 6 is constant the damage of the yarn will be minimized, whereas any excessive variation in the yarn tension would cause the thin yarn to be broken.
  • the variation in the tension of the yarn 7 is converted into a variation in the output voltage of the differential transformer 12 through the vertically movable roller 9, and this output voltages is compared with the output voltage then provided by the tachogenerator 18 connected with the three-phase induction motor 15, thereby varying the flow of the current to the main control means.
  • the flow of current passing to the main control means is in inverse proportion to the increase and decrease in the tension of the thin yarn 7.
  • the electrical circuit used with the constant tension controller device includes a battery 20, resistors 21, 22 and 23 for providing the bias voltage of an oscillating transistor 24, a highfrequency bypass capacitor 25, primary and secondary windings 26 and 27 of an oscillating transformer, a tuning capacitor 28, and a capacitor 29 for feeding back a part of the oscillation voltage;
  • the output voltage produced by the secondarywinding 27 of the oscillating transformer is low and must be amplified by an amplifier circuit at the next stage.
  • the electrical circuit further includes a coupling capacitor 30, resistors 31, 32 and 33 for providing the bias voltage of an amplifier transistor 34, a high-frequency bypass capacitor 35, windings 36, 37 and 38 of a differential transformer 12, capacitors 39, 40 and 41 connected in parallel with the windings 36, 37 and 38 of the differential transformer 12, respectively, and an iron core 42 connected with the vertically movable roller 9 in such arelationship that the output voltage is entirely offset when the iron core 42 is in a predetermined position.
  • the rectifier 13 includes diodes 43 and 44, smoothing capacitors 45 and 46, and resistors 47 and 48.
  • the voltages appearing in the windings 37 and 38 are different in magnitude. Accordingly, the voltages applied to the resistors 47 and 48 are also different in magnitude and direction and are in such a relationship that they are ofiset by each other, while across the rectifier 13 there appears a differential voltage in a certain direction.
  • the circuit of FIG. 2 further includes a capacitor 49 for smoothing the rectified voltage of the tacho-generator 18, a resistor 50, a thyristor 51 inserted in a phase of the power source supplying the three-phase induction motor 15, a diode bridge 52 to which a voltage is applied when the thyristor 51 is in the OFF" state, a voltage dropping resistor 53, a constant voltage diode 54, a unijunction transistor 55 constituting the ignition circuit of the thyristor 51, a phase controlling transistor 56, stabilizing resistors 57 and 58, a pulse transfonner 59 whose secondary winding is connected with the control terminal of the thyristor 51, a capacitor 60 for determining the time constant, and resistors 61 and 62 for providing the bias voltage of the phase controlling transistor 56.
  • the output voltage of the tacho-generator 18 is a dc. voltage of a predetermined direction, whereas the output voltage of the differential transformer 12 is a dc. voltage of a variable direction. Therefore, if the'flow of current to the phase controlling transistor 56 is controlled, the switching on of the unijunction transistor 55 is controlled so that the flow of current to the thyristor 51 is controlled by the secondary output of the pulse transformer 59. Instead of using the battery 20, it'
  • the battery 20 is a dc. voltage source required to operate the oscillation circuit and differential transformer 12.
  • the tacho-generator 18 and spool 6 are rotated.
  • the diameter of the turns of the wound yarn is increased to thereby vary the tension of the yarn portion left to be wound. It is important to maintain the tension of the yarn at a suitable value.
  • the output voltage appearing in thewinding 37 of the differential transformer l2 differs in magnitude and direction from the output voltage appearing in the winding 38 of the same transformer.
  • the induced voltage produced by the tacho-generator 18 is rectified by the rectifier 19 so that the magnitude of the voltage is varied but the direction thereof remains fixed.
  • the aforesaid two voltages are adjusted as described above, whereby the phase controlling transistor 56 has its operative state varied so as to control the switching on of the unijunction transistor 55.
  • the voltage produced thereby in the secondary winding of the pulse transformer 59 controls the flow of current to the thyristor 51 which in turn controls the number of revolutions of the three-phase induction motor.
  • FIG. 3 illustrates the characteristics of one-phase control of the three-phase induction motor.
  • the abscissa represents the number of revolutions N and the ordinate represents the torque T.
  • Curve a" is the torque curve for the three-phase induction motor 15 and curves ,b, fc, d, 2" and f represent the torque curves for the three-phase induction motor 15 as it is subjected to negative feedback by the tachogenerator 18 and rectifier 19 so as to vary the set value of the speed.
  • Curve g is the torque curve for the three-phase induction motor 15 as one of its phases is completelycut off. As seen from the graph of FIG.
  • the flow of current of one phase of the three-phase induction motor can be controlled over the range from curve (1" through curve Curve l. represents the torque requiredto provide a constant tension to the yarn 7 and theoretically this curve is a hyperbola.
  • Curve fll represents the torque equivalent to the mechanical loss of the winder and curve III" is the composite torque curve comprising curves I" and 11".
  • the composite curve III" is the curve actually required to provide a constanttension of the yarn 7 and the control is effected over the range from curve a to curve e, so as to broadly satisfy the composite curve III.
  • the range between curves 0" and e is wide enough to select a suitable number of revolutions to provide a constant tension of the yarn 7.
  • the torque required to provide tension in the yarn becomes as small as the fraction of the torque equivalent to the mechanical loss and this fraction is smaller for thinner yarn.
  • the torque of the load is practically represented by the mechanical loss. Therefore, with a winder for winding such a thin yarn, the composite torque of the load is always greater than the single-phase operating torque of the three-phase motor (curve g), whereby one-phase control is feasible.
  • the thyristor 51 is provided in one line of the three-phase induction motor 15, and the conduction angle (firing angle) of the thyristor is controlled. Alternatively, as illustrated in FIG.
  • one power line to the motor 15 may be connected across the ac. terminals of a bridge-type rectifier, the thyristor 51' being connected across the dc. terminals of the rectifier and the motor current being controlled by controlling the firing angle of the thyristor.
  • the gate and cathode of thyristor 51' are connected across the secondary winding of pulse transformer 59. Accordingly, as in the circuit of FIG. 2, the voltage produced across the secondary winding of transformer 59 when unijunction transistor 55 is switched on controls the flow of current through thyristor 51' which in turn controls the number of revolutions of the three-phase induction motor 15.
  • the present invention eliminates the need to use such power source means as a T-connection transformer.
  • the present invention allows the use of a smaller and less expensive motor, and as compared with the case where an electromagnetic clutch is used with the motor, the present invention ensures a lower cost and a longer life of the entire device.
  • the present invention solves this problem and ensures highly stable control by comparing the output voltage of the tacho-generator 18 with the output voltage of the differential transformer and effecting the one-phase control of the three-phase induction motor 15 in accordance with the difference between these two output voltages. Further, the present invention provides such a wide control range for the three-phase induction motor that stable control is ensured even if there is some fluctuation in extraneous factors such as source voltage variation or the like. Still further, the constant tension controller device provided by the present invention has a simplified construction, better perfonnance and is available at a lower cost than the conventional one. It will thus be appreciated that the present invention provides a constant tension controller device for a winder which can achieve better results than the prior art device.
  • a constant tension controller device for a winder comprising main control means (17) connected in series with one phase of a three-phase power source for controlling the flow of current therethrough,
  • a three-phase induction motor (15 connected to said threephase power source through said main control means (17) for driving a spool (6)
  • roller (9) mounted on an arm (11) supported pivotally at supporting point around which roller (9) yarn (7) is led from a supply reel through a fixed roll (8) to the spool (6),
  • a differential transformer (12) having an iron core (42) mechanically connected with said vertically movable roller 9) and having secondary windings (37, 38),
  • a tacho-generator (18) coupled to said three-phase induction motor (15) and connected to an associated rectifier circuit (19) having an output resistor (50) to produce a dc. output voltage corresponding to the rotational speed of said three-phase induction motor,
  • circuit means associated with said output resistors (47, 48) of said rectifier (13) and said output resistor (50) of said rectifier circuit and connected to said main control means (17) for producing the sum of said d.c. output voltage of said differential transformer l2) appearing at the output of said rectifier (13) and said d.c. output voltage of said tacho-generator (l8) appearing at the output of said rectifier circuit, whereby the flow of current through said main control means (17) is controlled by the combined dc. voltage.
  • a constant tension controller device for a winder comprising a phase controlling transistor 56) connected to receive the do. outputs of said differential transformer (12) and said tachogenerator 18) a unijunction transistor (55) connected to receive the output of said phase controlling transistor (56), and a pulse transformer (59) connected to receive the output of said unijunction transistor (55) and having its secondary winding connected to the control terminal of said main control means (17), whereby when the flow of current to said phase controlling transistor (56) is controlled, the switching on of said unijunction transistor (55) is controlled so that the flow of current to said main control means (17) is controlled by the secondary output of said pulse transformer (59).
  • a constant tension controller device for a winder wherein said main control means (17) is composed of a full-wave rectifier having its a.c. terminals connected in series with one phase of said three-phase power source and its d.c. terminals connected to a thyristor, whereby the flow of current through said full-wave rectifier is controlled by controlling the firing angle of said thyristor.

Landscapes

  • Tension Adjustment In Filamentary Materials (AREA)
  • Control Of Eletrric Generators (AREA)
US876284A 1968-11-20 1969-11-13 Constant tension controller device for winder Expired - Lifetime US3670975A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10221168 1968-11-20
JP10221068 1968-11-20

Publications (1)

Publication Number Publication Date
US3670975A true US3670975A (en) 1972-06-20

Family

ID=26442941

Family Applications (1)

Application Number Title Priority Date Filing Date
US876284A Expired - Lifetime US3670975A (en) 1968-11-20 1969-11-13 Constant tension controller device for winder

Country Status (3)

Country Link
US (1) US3670975A (enrdf_load_stackoverflow)
DE (1) DE1957782B2 (enrdf_load_stackoverflow)
GB (1) GB1290515A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798929A (en) * 1972-11-22 1974-03-26 Stop Motion Devices Corp Control means for filament storage devices
US3862723A (en) * 1971-04-26 1975-01-28 British Insulated Callenders Winding apparatus for elongated flexible material
US3908920A (en) * 1973-07-17 1975-09-30 Schuster & Co F M N Process and apparatus for maintaining constant thread tension
US3923151A (en) * 1972-10-27 1975-12-02 Eickhoff Geb Drive control system for an endless conveyor belt
US3931938A (en) * 1974-03-18 1976-01-13 Toray Industries, Inc. Method and apparatus for winding yarn into yarn package
US4093136A (en) * 1975-06-02 1978-06-06 James Mackie & Sons Limited Textile, yarn or tape winding machines
US4566646A (en) * 1984-05-11 1986-01-28 Leesona Corporation Take-up machine motor control
US4967973A (en) * 1985-03-29 1990-11-06 Murnane Gerard P Wire dispensing machines
US5277373A (en) * 1991-12-18 1994-01-11 Morton Henry H Apparatus and method for controlling tension in a moving material
RU2166571C1 (ru) * 2000-01-31 2001-05-10 Белоносов Александр Иванович Высокопроизводительный прядильный станок для получения льняной и хлопковой пряжи
US20130284845A1 (en) * 2012-04-27 2013-10-31 Web Industries, Inc. Interliner method and apparatus
US20140041926A1 (en) * 2012-08-09 2014-02-13 Southern Company Services, Inc. Transmission Line Autotensioner

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2424302C2 (de) * 1974-05-18 1983-09-15 Hoechst Ag, 6230 Frankfurt Verfahren zum Regeln der Fadenspannung
SE448226B (sv) * 1979-03-08 1987-02-02 Roose Vambola I Lindningsmaskin for serskilt tunn trad
DD218783A3 (de) * 1982-07-23 1985-02-13 Strickmaschinenbau Kmst Veb Steuereinrichtung fuer eine warenabzugsvorrichtung an strickmaschinen, insbesondre rundstrickmaschinen
GB8529782D0 (en) * 1985-12-03 1986-01-08 Orchard O J Paying off fine material & fibres under constant tension
FR2655888A1 (fr) * 1989-12-20 1991-06-21 Prosys Devidoir a regulation de tension du fil pour alimenter une bobineuse a partir d'une nourrice.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275192A (en) * 1939-12-16 1942-03-03 Gen Electric Control system
US2353639A (en) * 1941-11-28 1944-07-18 Western Electric Co Method of and apparatus for controlling spooling motors
US2509250A (en) * 1944-12-19 1950-05-30 American Viscose Corp Tension control for winding machines
US2571023A (en) * 1948-05-27 1951-10-09 Western Electric Co Mechanism for controlling the speed of motors
US2571454A (en) * 1948-07-02 1951-10-16 Cutler Hammer Inc Speed control for electric motors
US2752105A (en) * 1953-07-08 1956-06-26 Universal Winding Co Winding machine
US2844773A (en) * 1957-04-02 1958-07-22 Singer Mfg Co Induction motor control systems
US3180584A (en) * 1962-11-06 1965-04-27 Maihak Ag Control device and components thereof for electromotive drive for winding bobbins for yarn and the like
US3210625A (en) * 1962-09-11 1965-10-05 Whitin Machine Works Motor control

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275192A (en) * 1939-12-16 1942-03-03 Gen Electric Control system
US2353639A (en) * 1941-11-28 1944-07-18 Western Electric Co Method of and apparatus for controlling spooling motors
US2509250A (en) * 1944-12-19 1950-05-30 American Viscose Corp Tension control for winding machines
US2571023A (en) * 1948-05-27 1951-10-09 Western Electric Co Mechanism for controlling the speed of motors
US2571454A (en) * 1948-07-02 1951-10-16 Cutler Hammer Inc Speed control for electric motors
US2752105A (en) * 1953-07-08 1956-06-26 Universal Winding Co Winding machine
US2844773A (en) * 1957-04-02 1958-07-22 Singer Mfg Co Induction motor control systems
US3210625A (en) * 1962-09-11 1965-10-05 Whitin Machine Works Motor control
US3180584A (en) * 1962-11-06 1965-04-27 Maihak Ag Control device and components thereof for electromotive drive for winding bobbins for yarn and the like

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862723A (en) * 1971-04-26 1975-01-28 British Insulated Callenders Winding apparatus for elongated flexible material
US3923151A (en) * 1972-10-27 1975-12-02 Eickhoff Geb Drive control system for an endless conveyor belt
US3798929A (en) * 1972-11-22 1974-03-26 Stop Motion Devices Corp Control means for filament storage devices
US3908920A (en) * 1973-07-17 1975-09-30 Schuster & Co F M N Process and apparatus for maintaining constant thread tension
US3931938A (en) * 1974-03-18 1976-01-13 Toray Industries, Inc. Method and apparatus for winding yarn into yarn package
US4093136A (en) * 1975-06-02 1978-06-06 James Mackie & Sons Limited Textile, yarn or tape winding machines
US4566646A (en) * 1984-05-11 1986-01-28 Leesona Corporation Take-up machine motor control
US4967973A (en) * 1985-03-29 1990-11-06 Murnane Gerard P Wire dispensing machines
US5277373A (en) * 1991-12-18 1994-01-11 Morton Henry H Apparatus and method for controlling tension in a moving material
RU2166571C1 (ru) * 2000-01-31 2001-05-10 Белоносов Александр Иванович Высокопроизводительный прядильный станок для получения льняной и хлопковой пряжи
US20130284845A1 (en) * 2012-04-27 2013-10-31 Web Industries, Inc. Interliner method and apparatus
US10029876B2 (en) * 2012-04-27 2018-07-24 Web Industries, Inc. Interliner method and apparatus
US10322899B2 (en) * 2012-04-27 2019-06-18 Web Industries Inc. Interliner method and apparatus
US20140041926A1 (en) * 2012-08-09 2014-02-13 Southern Company Services, Inc. Transmission Line Autotensioner
US9013121B2 (en) * 2012-08-09 2015-04-21 Southern Company Services, Inc. Transmission line autotensioner

Also Published As

Publication number Publication date
DE1957782A1 (de) 1970-06-18
GB1290515A (enrdf_load_stackoverflow) 1972-09-27
DE1957782B2 (de) 1973-01-25

Similar Documents

Publication Publication Date Title
US3670975A (en) Constant tension controller device for winder
US2469706A (en) Electronic tension control apparatus
US4069985A (en) Winding machines with contact roller driven by synchronous motor or asynchronous motor
US2600308A (en) Speed-regulating control system
US2474620A (en) Coiling machine controller
US2169016A (en) Synchro-tie control
US2306157A (en) Control system
US2275192A (en) Control system
US2487755A (en) Strip material loop control
US2571454A (en) Speed control for electric motors
US2444248A (en) Control system
US3221237A (en) Series capacitor in d.c. motor control system
US2333978A (en) Control system
US3448357A (en) Tension control system for a reel drive
US2569287A (en) Motor control system
US2919391A (en) Speed controls for electric motors
US2468569A (en) Frequency regulating system
US2607028A (en) Voltage and frequency regulator
US2722646A (en) Alternating current motor control systems
US2644127A (en) Regulating system
US2541820A (en) Voltage regulator
US2223974A (en) Control system
US3060357A (en) Filament winding apparatus
US3082361A (en) Filament winding apparatus
US2938128A (en) Polyphase generator power transmission