US3347277A - Vibration isolating support for looms - Google Patents

Vibration isolating support for looms Download PDF

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Publication number
US3347277A
US3347277A US496280A US49628065A US3347277A US 3347277 A US3347277 A US 3347277A US 496280 A US496280 A US 496280A US 49628065 A US49628065 A US 49628065A US 3347277 A US3347277 A US 3347277A
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United States
Prior art keywords
loom
center
lay
frame
cables
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Expired - Lifetime
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US496280A
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English (en)
Inventor
Jr James T Gwinn
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Lord Corp
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Lord Corp
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Priority to US496280A priority Critical patent/US3347277A/en
Priority to BE686625D priority patent/BE686625A/xx
Priority to CH1412466A priority patent/CH461184A/de
Application granted granted Critical
Publication of US3347277A publication Critical patent/US3347277A/en
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Expired - Lifetime legal-status Critical Current

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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
    • D03D49/02—Construction of loom framework
    • D03D49/025—Ground supports
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D41/00—Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems

Definitions

  • Textile looms have a substantial vibration problem, principally introduced by the lay which packs the weft threads and by the picker mechanism which propels the shuttle. See Patent 2,187,510 and Shock and Vibration Handbook, Harris and Crede, 1961 edition, McGraw- Hill, volume 2, pages 32-6, 32-7.
  • the lay an unbalanced reciprocating member weighing some two to five hundred pounds oscillates at speeds between one hundred and three hundred cycles per minute through a double amplitude of approximately six inches.
  • the line of action of the inertia force due to oscillation of the lay is usually located above (sometimes below) the center of gravity of the loom and results in both fore and aft horizontal and vertical reaction forces at the loom feet (or attachment points to the supporting structure).
  • the picker mechanism of the loom In addition to the reaction forces due to the lay motion the picker mechanism of the loom generates lateral horizontal and vertical reaction forces.
  • the forces at the atachment points are directly transmitted to the support and in pracice have been the cause of extensive loom and building damage.
  • This invention isolates the vibration by supporting the loom for friction free rocking about axes crosswise to the lay and picker motions.
  • the inertia forces of the lay and picker mechanism are counteracted by the inertia force of the rest of the loom.
  • the lay and picker mechanism and loom motions are out of phase and theoretical isolation of the lay and picker mechanism inertia force is 100% if such a system is employed to its full effectiveness.
  • the loom is suspended by flexible cables and the axes are chosen so the lay and picker forces act through or near the centers of percussion. This provides a seismic suspension which ideally has no dampnig or elasticity.
  • FIG. 1 is a diagrammatic side elevation of a loom
  • FIG. 2 is a diagrammatic front elevation of a loom
  • FIG. 3 is a side elevation of a loom suspension
  • FIG. 4 is a top plan of the portion of the loom suspension shown in FIG. 3
  • FIG. 5 is an end elevation of one of the front suspension elements
  • FIG. 6 is a floor plan of the loom suspension.
  • the loom is diagrammatically indi cated at 1, typically weighs 4,000 pounds, and typically has an additional load of thread and finished cloth. As the cloth is woven and the finished cloth removed, this additional load continually changes in magnitude and location.
  • the principal sourceof vibration in the loom is the lay diagrammatically indicated at 2 which is reciprocated fore and aft by a crank 3 at a speed of from one hundred to three hundred strokes per minute.
  • the lay weights from 200 to 500 pounds and the shaking forces it generates are damaging to textile buildings. Since the magnitude of these forces increases as the square of the speed, the effects are becoming more pronounced in modern high speed operation.
  • picker mechanism diagrammatically indicated at 4 which is actuated alternately on opposite sides of the loom also at the speed of the crank 3. While the picker mechanism is lighter in weight than the lay, the related accelerations are greater and the resultant vibration is substantial.
  • FIGS. 1 and 2 To prevent the destructive effects of this vibration, the loom is supported by a structure diagrammatically shown in FIGS. 1 and 2 which in effect utilizes the inertia of the loom to react against the lay and picker mechanisms thereby isolating the vibration.
  • FIG. 1 in the region of the four corners of the loom are two brackets 6 at the front and two brackets 7 at the rear mounted on the building floor 8.
  • the term floor is used to include other supporting structure.
  • Between the bracket 6 and the front of the loom are flexible steel cables 9 applying to the loom a tension force along dotted lines 10.
  • Between the brackets 7 and the rear of the loom are flexible steel cables 11 applying to the loom a tension force along dotted lines 12.
  • the cables 9 and 11 support the .loom for rotation about an axis extending crosswise of the loom through an instantaneous center of rotation 13.
  • the cables may extend at different angles depending on lay and loom translational and rotational inertia properties and the lays location in the loom.
  • the force 15 passes exactly through the loom center of percussion, the force 15 produces only rocking motion of the loom about axis 13 and there is no transmission of the force 15 to the floor.
  • FIG. 2 which is a front elevation of the loom
  • the cables 9 apply tension forces to the loom along lines 10 which intersect at point 16 and support the front end of the loom for rotation or rocking movement about an axis transverse to the picker vibration forces indicated by arrow 17.
  • the point 16 is usually at a different distance below the floor 8 than the point 13. If the picker vibration 17 passes exactly through the loom center of percussion, none of the picker vibration is transmitted to the floor.
  • b (the distance from the line of action of the lay forces to the center of rotation 13) should be equal to T12 a 1+ on where a is the distance from the line of action of the lay forces to the loom center of gravity 14 and r is the centroidal radius of gyration of the loom.
  • b (the distance from the line of action 17 of the picker forces to the center of rotation 16) should equal to where a is the distance from the line of action of the picker forces to the loom center of gravity and r is the centroidal radius of gyration of the loom.
  • the cables 9 and 11 in FIG. 1 are oriented to be primarily effective for the fore and aft lay vibrations, the cables also allow sidewise motion of the loom and are helpful in isolating the sidewise inertia forces generated by the picker mechanism.
  • the cables 9 in FIG. 2 are oriented to be primarily effective for isolating sidewise vibrations of the picker mechanism, the cables also allow fore and aft motion of the loom which is effective in isolating the lay vibrations.
  • it is not necessary that the cables 9 and 11 have the compound orientation illustrated in FIGS. 1 and 2.
  • FIGS. 1 and 2 While the orientations of FIGS. 1 and 2 are preferred, some isolation is obtained due to the flexibility of the support system using cables 9 and 11 without the illustrated orientation.
  • the cables 9 and 11 are substantially non-stretchable in the length direction but are free to flex in any direction crosswise to the length direction and are universally swingable tension links.
  • FIGS. 3 to 6 a mounting system for isolating the lay vibration.
  • This system has two brackets 18 at the front of the loom mounted on the floor in the locations indicated at 19 in FIG. 6 and two brackets 20 at the rear of the loom to be mounted on the floor in the locations indicated at 21 in FIG. 6.
  • the front and rear brackets at each side of the loom are connected by a bar or strut 22 which positions the brackets 13 and 2% in fixed relation to each other.
  • the struts occupy the positions illustrated at 23 in FIG. 6.
  • Each strut and its associated front and rear brackets comprise an assembly which may be cemented to the building floor to fix their installed location.
  • the struts resist the longitudinal static forces from the brackets so that only the dead Weight of the loom is transmitted through the brackets to the building floor.
  • Each of the front brackets 18 has a pair of wire cables 24 extending between top and bottom plates 25 and 26.
  • the top plate 25 is fixed to the bracket 18.
  • the bottom plate 26 underlies and is bolted to one of the front loom feet 27.
  • the rear brackets 20 each have a pair of wire cables 28 extending between top and bottom plates 29 and 30.
  • the top plate 29 is fixed to the bracket and the bottom plate 30 underlies and is bolted to one of the rear loom feet 31.
  • the cables 24 have a steeper slope than the cables 28 because the center of gravity of the loom is toward the front.
  • each bottom plate 30 rests on the toe 32a of a stabilizer bracket 32 having knuckles 32b pivoted on pin 32c carried by the knuckle 32d at the upper end of a link 32e.
  • the bracket 32 has a seat 33 for a compression spring 34.
  • the lower end of the spring 34 seats in a member 35 fixed to bracket 20.
  • the link 32 slidably extends through the member 35 and the weight of the loom holds a nut 36 against the underside of the member 35. The position of the loom is adjusted by the nut 36 which raises and lowers the end of the bracket remote from the loom and thereby levels the loom.
  • the cables 24 and 23 lie in planes fore and aft of the loom and are focused lengthwise of the loom in the same manner as cables 9 and 11 in FIG. 1.
  • the effect of the cables 24 and 28 is primarily to cushion the lay forces. However, the cables do have some cushioning effect on the picker forces because of the lateral or sidewise flexibility.
  • the cables 24 and 28 may also be focused crosswise of the loom in the same manner as the cables 9 in FIG. 2 to introduce additional cushioning of the picker forces.
  • a loom having a frame having supporting feet spaced on opposite sides of the frame at the front and rear and above and out of load carrying relation to a floor and having mounted thereon a warp beam, harness, cloth roll and reciprocating l-ay mechanism acting lengthwise of the frame, said lay mechanism having a line of action fore and aft of the frame and to one side of the loom center of gravity, a floor supporting bnacket associated wtih each foot, said bracket having its lower end in load carrying relation to the floor and its upper end above the associated foot, a universally swingable tension link in load carrying relation between the upper end of each bracket and the associated foot, said links converging toward an axis crosswise of the loom and on the side of the loom center of gravity opposite the line of action of the lay mechanism.
  • a loom having a frame having supporting feet spaced above and out of load carrying relation to a floor and on opposite sides of the frame at the front and rear and having mounted thereon a warp beam, harness, cloth roll and reciprocating lay and picker mechanism respectively acting lengthwise and crosswise of the frame, said lay and picker mechanism each having a line of action on one side of the loom center of gravity, a supporting bracket associated with each foot, said bracket having its lower end in load carrying relation to the floor and its upper end spaced above the floor, a universally swingable tension link in load carrying relation between the upper end of each bracket and its associated foot, the links at the front and back of the loom converging to a center of rotation on the side of the loom center of gravity opposite the line of action of the lay mechanism and the links at the opposite sides of the loom converging toward a center of rotation on the side of the loom center of gravity opposite the line of action of the picker mechanism.
  • the loom of claim 1 in which the frame has mounted thereon picker mechanism with a line of action above the loom center of gravity and crosswise of the frame and in which the links converge fore and aft of the frame toward a center of rotation below the loom center of gravity and between the front and rear of the frame and also converge crosswise of the frame toward a center of rotation between the sides of the frame and below the loom center of gravity.
  • a loom having a frame having supporting feet spaced above and out of load carrying relation to a floor on opposite sides of the frame at the front and rear and having mounted thereon a warp beam, harness, cloth roll and reciprocating lay and picker mechanism respectively acting lengthwise and crosswise of the frame and said lay and picker mechanism each having a line of action on one side of the loom center of gravity, a floor supporting bracket associated with each foot, said bracket having its lower end in load carrying relation to the floor and the upper end spaced above the associated foot, a cable in load carrying relation between the upper end of each bracket and the associated foot, the cables at the front and back of the loom converging to a center of rotation on the side of the loom center of gravity opposite the line of action of the lay mechanism and the cables at the opposite sides of the loom converging toward a center of rotation on the side of the loom opposite the line of action of the picker mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Looms (AREA)
  • Vibration Prevention Devices (AREA)
US496280A 1965-10-15 1965-10-15 Vibration isolating support for looms Expired - Lifetime US3347277A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US496280A US3347277A (en) 1965-10-15 1965-10-15 Vibration isolating support for looms
BE686625D BE686625A (enrdf_load_stackoverflow) 1965-10-15 1966-09-08
CH1412466A CH461184A (de) 1965-10-15 1966-09-30 Verfahren für die schwingungsisolierende Lagerung eines mindestens einem Kraftstoss ausgesetzten Körpers und Mittel zu dessen Ausführung

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US496280A US3347277A (en) 1965-10-15 1965-10-15 Vibration isolating support for looms

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BE (1) BE686625A (enrdf_load_stackoverflow)
CH (1) CH461184A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587995A (en) * 1983-10-19 1986-05-13 Sulzer Brothers Limited Vibration-insulating and vibration-damping suspension for a weaving machine
US9084594B2 (en) 2012-01-10 2015-07-21 The Board Of Trustees Of The Lealand Stanford Junior University Methods for the prevention of surgical site infections
US9974564B2 (en) 2013-03-14 2018-05-22 Prescient Surgical, Inc. Methods and devices for the prevention of incisional surgical site infections
US10327751B2 (en) 2013-03-20 2019-06-25 Prescient Surgical, Inc. Methods and apparatus for reducing the risk of surgical site infections
US11596439B2 (en) 2017-11-07 2023-03-07 Prescient Surgical, Inc. Methods and apparatus for prevention of surgical site infection

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2187510A (en) * 1938-03-19 1940-01-16 Woods Mfg Company Ltd Loom and vibration control therefor
GB546004A (en) * 1941-02-15 1942-06-23 Metalastik Ltd Improved resilient mounting for instruments and machines
US2685425A (en) * 1949-02-21 1954-08-03 Lord Mfg Co Mounting system
FR1272615A (fr) * 1959-08-21 1961-09-29 Metalastik Ltd Support élastique notamment pour bâti de machine
US3115323A (en) * 1961-06-16 1963-12-24 Francis J Crandell Vibration isolators
US3160376A (en) * 1962-05-21 1964-12-08 H & S Co Inc Loom anti-vibration mounting means
US3204911A (en) * 1962-10-25 1965-09-07 Aeroflex Lab Inc Vibration damping and load-supporting apparatus
US3239207A (en) * 1963-03-09 1966-03-08 Cable Isolation Systems Inc Process and resilient assembly apt to absorb vibrations or shocks and/or to transmit torques
US3282543A (en) * 1964-07-21 1966-11-01 H & S Co Inc Vibration isolating support for machinery

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2187510A (en) * 1938-03-19 1940-01-16 Woods Mfg Company Ltd Loom and vibration control therefor
GB546004A (en) * 1941-02-15 1942-06-23 Metalastik Ltd Improved resilient mounting for instruments and machines
US2685425A (en) * 1949-02-21 1954-08-03 Lord Mfg Co Mounting system
FR1272615A (fr) * 1959-08-21 1961-09-29 Metalastik Ltd Support élastique notamment pour bâti de machine
US3115323A (en) * 1961-06-16 1963-12-24 Francis J Crandell Vibration isolators
US3160376A (en) * 1962-05-21 1964-12-08 H & S Co Inc Loom anti-vibration mounting means
US3204911A (en) * 1962-10-25 1965-09-07 Aeroflex Lab Inc Vibration damping and load-supporting apparatus
US3239207A (en) * 1963-03-09 1966-03-08 Cable Isolation Systems Inc Process and resilient assembly apt to absorb vibrations or shocks and/or to transmit torques
US3282543A (en) * 1964-07-21 1966-11-01 H & S Co Inc Vibration isolating support for machinery

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587995A (en) * 1983-10-19 1986-05-13 Sulzer Brothers Limited Vibration-insulating and vibration-damping suspension for a weaving machine
US9084594B2 (en) 2012-01-10 2015-07-21 The Board Of Trustees Of The Lealand Stanford Junior University Methods for the prevention of surgical site infections
US9393005B2 (en) 2012-01-10 2016-07-19 The Board Of Trustees Of The Leland Stanford Junior University Systems for the prevention of surgical site infections
US9788823B2 (en) 2012-01-10 2017-10-17 The Board Of Trustees Of The Leland Stanford Junior University Methods for the prevention of surgical site infections
US10085734B2 (en) 2012-01-10 2018-10-02 The Board Of Trustees Of The Leland Stanford Junior University Systems for the prevention of surgical site infections
US10993709B2 (en) 2012-01-10 2021-05-04 The Board Of Trustees Of The Leland Stanford Junior University Systems for the prevention of surgical site infections
US9974564B2 (en) 2013-03-14 2018-05-22 Prescient Surgical, Inc. Methods and devices for the prevention of incisional surgical site infections
US10327751B2 (en) 2013-03-20 2019-06-25 Prescient Surgical, Inc. Methods and apparatus for reducing the risk of surgical site infections
US11596439B2 (en) 2017-11-07 2023-03-07 Prescient Surgical, Inc. Methods and apparatus for prevention of surgical site infection

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Publication number Publication date
CH461184A (de) 1968-08-15
BE686625A (enrdf_load_stackoverflow) 1967-02-15

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