US3364403A - Motor control for maintaining the tension of positively pulled warp threads in warp looms - Google Patents

Motor control for maintaining the tension of positively pulled warp threads in warp looms Download PDF

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Publication number
US3364403A
US3364403A US592946A US59294666A US3364403A US 3364403 A US3364403 A US 3364403A US 592946 A US592946 A US 592946A US 59294666 A US59294666 A US 59294666A US 3364403 A US3364403 A US 3364403A
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United States
Prior art keywords
tension
warp
motor
speed
threads
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Expired - Lifetime
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US592946A
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English (en)
Inventor
Liebchen Waldemar
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.)
Jean Guesken Maschinenfabrik Eisengiesserei
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Jean Guesken Maschinenfabrik Eisengiesserei
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/94—Driving-gear not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/182—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in unwinding mechanisms or in connection with unwinding operations
    • B65H23/1825—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in unwinding mechanisms or in connection with unwinding operations and controlling web tension
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/06—Warp let-off mechanisms
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind

Definitions

  • the invention relates to a method of controlling the winding-off speed of positively pulled warp threads in warp looms, especially the pile threads in plush looms, and to an apparatus for carrying out the process.
  • an apparatus for carrying out this process has devices for supplying impulses controlled by the swinging of a tension balance in opposite directions, these impulses being supplied to the control arrangement for changing the driving speed of the beam.
  • the arrangement for the changing of the driving speed is advantageously an infinitely variable transmission.
  • An especially advantageous modification of the invention consists in using electric limit switches, which operate the positioning or control motor of the infinitely vari' able transmission.
  • the latter is preferably a repulsion motor.
  • timing mechanism for lengthening the interval of timing of the impulse produced, for example an electrical relay with means for automatically holding the switch contacts closed for a limited time.
  • FIG. 1 shows in perspective and schematically an arrangement for carrying out the invention
  • FIG. 2 is a wiring diagram.
  • FIG. 1 shows one end of a warp beam 11, mounted on a shaft 12 rotatable in a bearing 13 carried by the machine frame.
  • the wrap threads 14 are, in the usual way, drawn off from the warp beam 11 and pass through a conventional tension balance 15, which is carried by a shaft 17 journalled at 16 in the machine frame and urged by spring 16a in a counterclockwise direction, to the needle eyes of the machine, which are not shown.
  • the beam can also be the pile beam of a cut plush loom, the pile threads being led in a similar manner over a tension balance to the different needles. Because the pile beam, as far as its diameter is concerned, does not differ appreciably from the warp beam carrying the threads for the base fabric, the construction to be described is satisfactory in all particulars also for the control of the winding-olf speed of pile threads in plush looms, so that there are no additional requirements whether only the pile beam or only the warp beam or only individual warp beams are to be positively driven.
  • a sprocket 18 On the end of shaft 12 of the warp beam 11 is a sprocket 18, which is drivably connected by chain 19 with a sprocket 21 on an intermediate shaft 22.
  • the intermediate shaft 22 also carries a pinion 23 which engages with an intermediate pinion 24 which is also in engagement with a pinion 27 arranged on the driven shaft 25 of the reducing gear 26.
  • the reducing gear takes its power through the sprockets 28, 29 connected by chain 31 from the cam shaft 32 of the loom, by which the tongues of the eye needles of the machine are in the conventional way moved out and in or up and down.
  • the pinions 23, 24, 27 form a changeable ratio drive, whose transmission ratio can be changed by changing the pinion 23.
  • the intermediate pinion 24 is carried by a lever 33 which is journalled on the drive shaft 25 so that it can be adjusted to any selected diameter of the pinion 23.
  • the segment lever 33 In the engaged position of the pinions 23-, 24, the segment lever 33 is fastened by a bolt 35 passing through a coaxial slot 34 in the lever 33 and mounted stationarily on the housing of the reducing gear 26.
  • the transmission ratio of the drive between the cam shaft 32 and the warp beam shaft 12, that is the chain drive 29, 31, 28 of the reducing gear 26, the variable ratio drive 27, 24, 23 and the chain drive 21, 19, 18 are so selected and determined that the warp beam 11 at a predetermined speed of the cam shaft 32 is turned at a speed corresponding to the mean requirement of the warp thread lengths to be unwound.
  • the gear 26 is formed as an infinitely variable transmission.
  • Such devices are well known.
  • a shaft 37 which carries a worm gear 38.
  • a worm 39 on a stationarily journalled auxiliary shaft 41 meshes with worm gear 38.
  • Auxiliary shaft 41 is connected by a worm gear 42 and a worm 43 to be driven by an electric motor 44 which may be constituted as a reversing motor.
  • the shaft 17 of the tension detector extends outwardly beyond the bearing 16.
  • This extension carries two levers 45, 46 clamped on it which cooperate with electrical limit switches 47, 48, respectively, mounted on the machine frame.
  • the limit switches 47, 48 and the levers 45, 46 are arranged in relation to each other and in relation to the tension balance so that, in the normal median position of the tension balance 15, the two curved levers lie between the switches 47, 48.
  • the tension balance 15- swings clockwise through a given angle (position shown in the drawing) the curved lever 45 operates the limit switch 47.
  • Lines 49, 51 lead from the limit switches 47, 48 to a relay switch 52 which is connected in the input line 53, 54 of motor 44.
  • motor 44 upon operation of one of the limit switches 47, 48, is connected to current source S in such a way that, depending upon which end switch has produced the switching, the motor is turned in such a direction that the transmission ratio of the reducing gear is changed in a sense opposite to that of the connected lever 47 or 48, so as to vary the tension of the thread and restore the member 15 to its normal position.
  • the switch relay 52 is provided with an automatic arrangement for holding the control switches closed for a predetermined period each time one of the limit switches is closed. Such a circuit is shown in FIG. 2.
  • Three-phase line 53 having conductors 53a, 53b, 53c connects switch box 52 to alternating current source S, while line 54 having three conductors 54a, 54b, 54c connects switch box 52 to motor 44.
  • line 54 having three conductors 54a, 54b, 54c connects switch box 52 to motor 44.
  • Within the switch box are conventional three-pole switches 56, 57 arranged in parallel for connecting conductors 53a, 53b, 53c to conductors 54a, 54b, 540 so as to energize motor 44 in opposite directions. Switches 56, 57 are closed by energization of coils 56a, 57a respectively.
  • a line 58 connects one terminal of each of coils 56a, 57a through rectifier 59 and variable resistance 61, controlled by knob 55, to conductor 53b.
  • Lines 49a, 51a connect lines 49, 51 from limit switches 47, 48 to the other terminals of coils 56a, 57a respectively.
  • a common'line 63a connects conductor 530 through lines 4%, 51b to the other side of switches 47, 48 respectively.
  • Line 64 extends from rectifier 59 to lines 64a, 64b connected through resistances 65a, 65b to plates of condensers 66a, 6612, the other plates of which are connected to lines 49a, 51a respectively.
  • limit switch 47 will be closed. This will energize relay 56a to close switch 56, operating motor 44 in such a direction as to in- 4. crease the transmission ratio of transmission 28 to speed up the rate of feed of the thread. At the same time, condenser 66a is charged.
  • the motor will run inone direction for a predetermined time, no matter how short the time of closure of the limit switch may be. This reduces hunting and maintains the tension bar nearer to the middle of its range.
  • Closure of switch 48 produces, in the same manner, energization of coil 57a for a predetermined time to turn the motor in the opposite direction to increase the tension.
  • a Warp loom having a warp beam from which threads are withdrawn and having a variable-speed driving mechanism connected to the warp beam, a motor connected to said driving mechanism to vary the speed thereof, tension responsive means in the path of the withdrawn threads includin. a part movable in opposite directions through a range as tension varies, and means connected to said tension responsive means for connecting said motor to a current source for turning it in opposite directions thereby increasing or decreasing the speed of ,said driving mechanism as the movable part of said tension responsive means reaches one or the other end of said range, respectively, said connecting means including timing means to maintain connection of said electric motor to the current source for a predetermined time at each operation thereof, operation of said motor tending to move said part towards the other end of said range.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Knitting Machines (AREA)
US592946A 1963-11-07 1966-11-08 Motor control for maintaining the tension of positively pulled warp threads in warp looms Expired - Lifetime US3364403A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG0039118 1963-11-07

Publications (1)

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US3364403A true US3364403A (en) 1968-01-16

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US (1) US3364403A (de)
DE (1) DE1585080C2 (de)
NL (1) NL6403020A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668904A (en) * 1970-04-08 1972-06-13 Karel Murenbeeld Device for automatically regulating the thread consumption of warped knitting machines
US3774415A (en) * 1971-01-23 1973-11-27 Schlafhorst & Co W Device for winding or unwinding material conducted in web or linear form, particularly groups of textile threads
US3878872A (en) * 1972-09-29 1975-04-22 Sulzer Ag Warp let-off means
US3930523A (en) * 1972-11-29 1976-01-06 Marlasca Garcia D Francisco Control mechanism for automatically operated warp beams with automatic setting
EP0100394B1 (de) * 1982-07-13 1986-05-07 Zellweger Uster Ag Verfahren und Vorrichtung zur Messung der Spannung an textilen Flächengebilden auf Textilmaschinen, insbesondere Webmaschinen
DE4012799A1 (de) * 1990-04-21 1991-10-24 Dorstener Maschf Ag Kettablassvorrichtung fuer den kettbaum einer webmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463216A1 (fr) * 1979-08-07 1981-02-20 Alsacienne Constr Meca Dispositif de regulation de la tension d'une nappe de fils de chaine dans un metier a tisser

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1709616A (en) * 1925-11-06 1929-04-16 Gen Electric Regulating system
US2348090A (en) * 1940-05-08 1944-05-02 Allis Chalmers Mfg Co Constant tension drive
US2353639A (en) * 1941-11-28 1944-07-18 Western Electric Co Method of and apparatus for controlling spooling motors
US2896140A (en) * 1955-04-26 1959-07-21 Singer Mfg Co Motor controls for winding machines
US2903635A (en) * 1955-08-03 1959-09-08 Forgrove Mach Wrapping or like machines
US3179863A (en) * 1960-05-31 1965-04-20 Emerson Electric Co Tension control system using a high slip motor driven variable ratio transmission

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736396A (en) * 1951-10-16 1955-09-07 Robert Reiner Inc Warp knitting machine
US3097511A (en) * 1956-03-16 1963-07-16 Warp knitting machines
GB844453A (en) * 1956-04-27 1960-08-10 Liebrandt Karl Improvements in or relating to control mechanisms for warp beams

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1709616A (en) * 1925-11-06 1929-04-16 Gen Electric Regulating system
US2348090A (en) * 1940-05-08 1944-05-02 Allis Chalmers Mfg Co Constant tension drive
US2353639A (en) * 1941-11-28 1944-07-18 Western Electric Co Method of and apparatus for controlling spooling motors
US2896140A (en) * 1955-04-26 1959-07-21 Singer Mfg Co Motor controls for winding machines
US2903635A (en) * 1955-08-03 1959-09-08 Forgrove Mach Wrapping or like machines
US3179863A (en) * 1960-05-31 1965-04-20 Emerson Electric Co Tension control system using a high slip motor driven variable ratio transmission

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668904A (en) * 1970-04-08 1972-06-13 Karel Murenbeeld Device for automatically regulating the thread consumption of warped knitting machines
US3774415A (en) * 1971-01-23 1973-11-27 Schlafhorst & Co W Device for winding or unwinding material conducted in web or linear form, particularly groups of textile threads
US3878872A (en) * 1972-09-29 1975-04-22 Sulzer Ag Warp let-off means
US3930523A (en) * 1972-11-29 1976-01-06 Marlasca Garcia D Francisco Control mechanism for automatically operated warp beams with automatic setting
EP0100394B1 (de) * 1982-07-13 1986-05-07 Zellweger Uster Ag Verfahren und Vorrichtung zur Messung der Spannung an textilen Flächengebilden auf Textilmaschinen, insbesondere Webmaschinen
DE4012799A1 (de) * 1990-04-21 1991-10-24 Dorstener Maschf Ag Kettablassvorrichtung fuer den kettbaum einer webmaschine

Also Published As

Publication number Publication date
DE1585080C2 (de) 1971-09-23
NL6403020A (de) 1965-05-10
DE1585080B1 (de) 1971-02-18

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