US3417791A - Warp beam take-off drive - Google Patents

Warp beam take-off drive Download PDF

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Publication number
US3417791A
US3417791A US619804A US61980467A US3417791A US 3417791 A US3417791 A US 3417791A US 619804 A US619804 A US 619804A US 61980467 A US61980467 A US 61980467A US 3417791 A US3417791 A US 3417791A
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United States
Prior art keywords
warp
warp beam
brake
drive
control
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
US619804A
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English (en)
Inventor
Gattiker Ernst
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.)
Saurer AG
Original Assignee
Adolph Saurer AG
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 Adolph Saurer AG filed Critical Adolph Saurer AG
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Publication of US3417791A publication Critical patent/US3417791A/en
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    • 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
    • D03D49/08—Warp beam brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D39/00—Pile-fabric looms
    • 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

Definitions

  • the present invention relates to a warp beam take-off drive, and more particularly to the take-off drive of a pile warp beam of a pile fabric loom.
  • the transporting rollers transport the pile warp which is wound up on the pile warp beam whereby the pile warp beam is rotated, without requiring drive means of its own.
  • This type of take-off drive has disadvantages inasmuch as upon start of the transporting rollers, the turning movement of the pile warp beam is started with a jolt since its great inertia has to be overcome.
  • the warp portion between the pile warp beam and the transporting rollers is excessively tensioned, while upon start of the rotation of the pile warp beam, the same turns too fast due to its inertia, and causes slackening of the warp before the slack is taken up by the transporting rollers.
  • Another disadvantage is the necessity of regulating the brake of the warp beam depending on the diameter of the warp package wound up on the warp beam to avoid varying tensioning of the warp which has a detrimental effect on the fabric produced by the loom, particularly if the warp is the pile warp of a pile fabric.
  • Another prior art construction provides a horizontally movable pendulum roller which permits to move a certain length of the warp ahead.
  • an electrornotor drives the warp beam positively through a worm gear drive until the pendulum roller arrives at one end position and stops the motor by operating a limit switch.
  • the warp beam rotation is thus blocked, and the transporting means transports the portion of the warp which is controlled by the pendulum roller only so that only the resistance of the same has to be overcome.
  • the slack of the warp is taken up, and the roller arrives in its other end position, another limit switch is actuated and the electromotor is started so that the operation is repeated.
  • This prior art construction has the disadvantage that a drive motor for the warp means is required.
  • Another object of the invention is to use the tension of the warp for controlling a brake acting on the warp beam.
  • the present invention is concerned with a warp beam take-off drive which comprises a warp beam and transporting means for unwinding a warp from the warp beam so that the unwinding torque rotates the warp beam.
  • One embodiment of the invention comprises brake means for braking the warp beam with a variable braking torque opposed to the unwinding torque, and movable control means disposed intermediate the warp beam and the transporting means and applying a force to the same which is caused by the weight of the control means, and by a spring acting on the same.
  • the control means is operatively connected with the brake means and operates the same so that the brake torque is reduced when the control means is displaced in one direction by the warp tensioned by the transporting means, and is increased when the warp slackens whereby the warp beam continuously rotates at a substantially constant speed.
  • the weight of the control means is selected so that the brake torque is equal to the unwinding torque produced by the control means when the transporting means is at a standstill.
  • control means includes lever arms supporting a control member in the form of a roller extending across the warp and resting on the same, and the brake means has an adjusting lever connected by a linkage with the lever arms.
  • the brake means is preferably a friction brake having a brake band connected to the adjusting lever, however, in a modified embodiment, an electromagnetic brake is used for braking the warp beam, and has a circuit including a pair of limit switches operated by a part of the control means.
  • a pair of upright supports 2 is mounted at the rear end of the frame 1 of a pile fabric loom.
  • a base warp 5 of a pile fabric is transported along frame 1 and is combined with the pile warp 4 which is unwound from a warp beam 3 on which the warp 4 is wound up in the form of a reel or package 4a.
  • Warp beam 3 is mounted in bearings on supports 2 which also support a driving and transporting roller 6, and a pair of guiding rollers 7 and 8 cooperating drive roller 6 to transport the pile warp 4 so that the same is unwound from the warp beam 3.
  • Double armed lever means 11 are mounted on support means 2 in bearings 9 and have arm means 11b rotatably carrying a control roller 14 which rests in an open loop of pile warp 4 and extends across the same.
  • Arm means 11b preferably include a pair of arms 11b, 11b" pivotally mounted in bearings 9 and having free ends connected by a shaft on which roller 14 is mounted between the free ends of lever arms 11b, 1111". Due to its weight, control roller 14 is biased by gravity and exerts a tensioning force on the portion of the warp between warp beam 3 and transporting means including a plurality of horizontal driving end guiding rollers 6, 7, 8. If the weight of control roller 14 is not suflicient, a torsion spring 11a, acting on lever means 11, is provided to increase the force applied by control roller 14 to warp 4.
  • Warp beam 3 carries a brake drum 16 over which a brake band 15 passes.
  • One end 17 of the brake band is secured to support means 2 and fixed, while the other end of the brake band has a pair of stop members 18 and 19 between which a coil spring 20' is disposed.
  • An adjusting lever 12 for brake 15, 16 is mounted for turning movement in a bearing of support means 2 and has an arm located between stop 18 and spring 20, and another arm connected by a linkage 13 to the second arm means 110 of double armed lever means 11.
  • control roller 14 exerts a tensioning force on warp 4 in the unwinding direction which urges the yarn package 4a and warp beam 3 to rotate in counterclockwise direction.
  • control lever means 11 controls the adjusting lever 12 of brake 15, 16 to produce a brake torque opposing the unwinding torque produced by control roller 14.
  • the ratio between the lever arms, and the weight or spring force of control roller 14 are so selected that, when rollers 6, 7, 8 are not operated, the brake torque balances the unwinding torque produced by control roller 14. Consequently, the warp beam does not turn when driving roller 6 is not driven.
  • the rotating warp beam turns reel 4a so that the same supplies an additional length of warp 4 to the open loop therein, permitting control roller 14 to move down which causes actuation of lever 12 by link 13 in counterclockwise direction so that brake band 15 is gradually tightened by spring 20 pressed against stop 19.
  • driving roller 6 is successively started and stopped, and after several operations of control means 11, 14, brake means 15, 16 has adjusted the rotary speed of warp beam 3 so that the same slowly and continuously rotates while the tension of the portion of warp 4 between rollers 6, 7, 8 and warp beam 3 remains constant Without any additional adjustment. While the rotation of warp beam 3 is still due to the unwinding torque of Warp 4 produced by driving and guiding rollers 6, 7, 8, the tension of warp 4 is held constant by slow movement of the control means.
  • the mechanical friction brake is replaced by an electromagnetic brake in whose exciting circuit two limit switches are provided for energizing and deenergizing the electromagnetic brake.
  • the limit switches are operated by lever means 11 which may be constructed as a pair of levers respectively pivotally mounted on support 2 and connected by a shaft on which control roller 14 is mounted for rotation.
  • lever means 11 which may be constructed as a pair of levers respectively pivotally mounted on support 2 and connected by a shaft on which control roller 14 is mounted for rotation.
  • increased tension of warp 4 will raise control roller 14 so that one of the limit switches is actuated to de-energize the electromagnetic brake permitting a greater length of warp 4 to be supplied to the transporting rollers.
  • a warp beam take-01f drive comprising, a warp beam mounted for rotation; transporting means for unwinding a warp from said warp beam whereby an unwinding torque is applied to said Warp beam and the same is rotated, said transporting means including a plurality of horizontal guiding and driving rollers over which said warp is guided; brake means for braking said warp beam with a variable braking torque opposed to said unwinding torque; and control means including a horizontal control member mounted for upward and downward movement and disposed intermediate said warp beam and said guiding and driving rollers substantially adjacent to the same and below the same resting on said warp due to the force of gravity whereby a loop open on top and supporting said control member at the lowest point thereof is formed in said warp and an additional unwinding torque is applied to said warp beam; and connecting linkage means operatively connecting said control means 'with said brake means for operating the same depending on the position of said control member so that said brake torque is reduced when said control member is raised against the action of garvity when said warp is tensione
  • Warp beam take-off drive as claimed in claim 1 wherein said brake rneans include a brake for said warp beam, and adjusting means for said brake connected by said connecting linkage means with said control means, said adjusting means including an adjusting member connected with said brake, and a spring means connecting said adjusting member with said connecting linkage means so that movements of said control member and of said control means are transmitted by said connecting linkage means and said spring means to said adjusting member of said brake.
  • Warp beam take-off drive as claimed in claim 3 wherein said control means include movable lever means having a horizontal axis and supporting said control member for up and down movement, wherein said adjusting member has a stop and mounts said spring means abutting said stop; and wherein said connecting linkage means includes a lever connected with said spring means for urging the same against said stop for operating said adjusting member.
  • a Warp beam take-off drive as defined in claim 7 References Cited UNITED STATES PATENTS 1,539,178 5/1925 Giardino 139-102 2,397,914 4/1946 Blouin l39109 2,705,024 3/1955 Beer l39l09 FOREIGN PATENTS 538,276 6/1955 Belgium. 1,092,501 11/1954 France.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Warping, Beaming, Or Leasing (AREA)
  • Looms (AREA)
US619804A 1966-03-28 1967-03-01 Warp beam take-off drive Expired - Lifetime US3417791A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH445666A CH435148A (de) 1966-03-28 1966-03-28 Antriebsvorrichtung für den Polkettbaum von Frottierwebmaschinen

Publications (1)

Publication Number Publication Date
US3417791A true US3417791A (en) 1968-12-24

Family

ID=4276453

Family Applications (1)

Application Number Title Priority Date Filing Date
US619804A Expired - Lifetime US3417791A (en) 1966-03-28 1967-03-01 Warp beam take-off drive

Country Status (5)

Country Link
US (1) US3417791A (is")
BE (1) BE694150A (is")
CH (1) CH435148A (is")
FR (1) FR1512889A (is")
GB (1) GB1138641A (is")

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878872A (en) * 1972-09-29 1975-04-22 Sulzer Ag Warp let-off means
US4637437A (en) * 1983-10-06 1987-01-20 Sulzer Brothers Limited Brake for a weaving machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH609386A5 (is") * 1976-01-20 1979-02-28 Rueti Ag Maschf
DE2817185B2 (de) * 1978-04-20 1980-07-17 Lindauer Dornier Gesellschaft Mbh, 8990 Lindau Polkettfadenabwickelvorrichtung für eine Frottierwebmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE538276A (is") * 1954-09-06
US1539178A (en) * 1922-06-17 1925-05-26 Giardino Joachim Loom
US2397914A (en) * 1944-03-04 1946-04-09 Pacifie Mills Loom weight hanger mechanism
US2705024A (en) * 1951-07-01 1955-03-29 Kurtz Eisenwerk Ph Warp letting-off in textile looms
FR1092501A (fr) * 1953-10-27 1955-04-22 Sagem Dispositif d'alimentation pour machines textiles ou autres

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539178A (en) * 1922-06-17 1925-05-26 Giardino Joachim Loom
US2397914A (en) * 1944-03-04 1946-04-09 Pacifie Mills Loom weight hanger mechanism
US2705024A (en) * 1951-07-01 1955-03-29 Kurtz Eisenwerk Ph Warp letting-off in textile looms
FR1092501A (fr) * 1953-10-27 1955-04-22 Sagem Dispositif d'alimentation pour machines textiles ou autres
BE538276A (is") * 1954-09-06

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878872A (en) * 1972-09-29 1975-04-22 Sulzer Ag Warp let-off means
US4637437A (en) * 1983-10-06 1987-01-20 Sulzer Brothers Limited Brake for a weaving machine

Also Published As

Publication number Publication date
CH435148A (de) 1967-04-30
BE694150A (is") 1967-07-31
FR1512889A (fr) 1968-02-09
GB1138641A (en) 1969-01-01

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