EP0090249B1 - Warp beam with inner torsion bar for weaving looms - Google Patents

Warp beam with inner torsion bar for weaving looms Download PDF

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Publication number
EP0090249B1
EP0090249B1 EP83102497A EP83102497A EP0090249B1 EP 0090249 B1 EP0090249 B1 EP 0090249B1 EP 83102497 A EP83102497 A EP 83102497A EP 83102497 A EP83102497 A EP 83102497A EP 0090249 B1 EP0090249 B1 EP 0090249B1
Authority
EP
European Patent Office
Prior art keywords
torsion bar
warp beam
cylinder
support
axis
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
Application number
EP83102497A
Other languages
German (de)
French (fr)
Other versions
EP0090249A1 (en
Inventor
Luigi Pezzoli
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.)
Vamatex SpA
Original Assignee
Vamatex SpA
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 Vamatex SpA filed Critical Vamatex SpA
Priority to AT83102497T priority Critical patent/ATE20913T1/en
Publication of EP0090249A1 publication Critical patent/EP0090249A1/en
Application granted granted Critical
Publication of EP0090249B1 publication Critical patent/EP0090249B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to an improved warp beam for weaving looms.
  • the object of the present invention is to provide an improved arrangement of the warp beam torsion bar unit and of the respective contrast means in a weaving loom, reducing the overall dimensions of the warp beam and of the torsion bar, as well as the dimensions of the elastic contrast elements, without any transmission or leverage and allowing the warp beam to rotate about its own axis.
  • the warp beam 1 of the invention consists of a hollow metal cylinder 2, which is mounted at each end onto a support 3 by way of a bearing 4.
  • the cylinder 2 may thus rotate on the bearing 4 in respect of the support 3, which is besides provided with a clamp 5, normally loose and by tightening of which the cylinder 2 can be stopped from rotating.
  • the support 3 is made so as to support also the torsion bar 6, which is housed inside the hollow cylinder 2 in an eccentric position, namely with its axis 6' parallel to the axis 2' of the cylinder 2 but spaced therefrom, as clearly evidenced in the figures of the drawing.
  • the bar 6 is locked to the support 3 by a second clamp 7 of said support, normally tightened, and its end is mounted in a conventional way onto the frame 8 of the loom.
  • Reference 9 indicates contrast spring means acting on the warp beam-torsion bar unit through a lever 10 provided with a toothing 11 for hooking the spring 9 into a plurality of positions, to which correspond variable contrast actions of said spring 9.
  • the size of the unit comprising the warp beam and the torsion bar therefor is notably reduced, the dimensions being - as clearly evident from the above description and drawing - simply those of the warp beam (within whose cylinder the torsion bar is housed). Furthermore, in said arrangement, the point in which the resultant of the warp tensions is applied is very close to the axis of the torsion bar, which forms the fulcrum of application thereof; the torque being generated by said resultant is thereby small (having an arm six or seven times smaller than that of the conventional arrangements), with the considerable advantage of allowing to use a contrast system being less stressed, so reducing the dimensions even further.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

In a thread carrier (1) for weaving looms, the torsion bar (6) associated thereto is positioned inside the hollow cylinder (2) of said thread carrier, with its axis (6 min ) parallel to but separate from the axis of said cylinder (2 min ), two end supports (3) connecting the cylinder to the torsion bar by means of a clamp (7) provided between the support and the bar and a clamp (5) and bearing provided between the support and the cylinder.

Description

  • The present invention relates to an improved warp beam for weaving looms.
  • As known, one of the problems which the designers of looms have to face is that of an appropriate positioning of the warp beam and of the torsion bar controlling the let-off motion mechanism, which torsion bar is associated to the warp beam in order to extend the signals, anywhere produced by the variations of tension in the threads, to the full height of the loom.
  • The current trend to increase the width of weaving machines, to obtain wider fabrics, causes the hollow metal cylinder forming the warp beam in looms to be subjected to increasingly higher stresses. It is hence necessary to increase the diameter of said cylinder, the diameter of the torsion bar and the load to be opposed: this means an increase of the overall volume of said unit, with serious inconveniences for the planning of the loom.
  • The object of the present invention is to provide an improved arrangement of the warp beam torsion bar unit and of the respective contrast means in a weaving loom, reducing the overall dimensions of the warp beam and of the torsion bar, as well as the dimensions of the elastic contrast elements, without any transmission or leverage and allowing the warp beam to rotate about its own axis.
  • This is obtained, according to the invention, by arranging the torsion bar inside the hollow cylinder of the warp beam, with its own axis parallel to but spaced from the axis of said cylinder, two end supports connecting the cylinder to the torsion bar by means of a clamp provided between the support and the bar and a clamp and bearing provided between the support and the cylinder.
  • The invention will be described hereinafter, by mere way of example, with reference to the accompanying drawing, which shows a preferred embodiment thereof and in which:
    • Fig. 1 is a head view - with some parts in section and other parts removed - of the arrangement according to the present invention; and
    • Fig. 2 is a scrap view, from the top and at one end, of the arrangement of Figure 1.
  • With reference to the drawing, the warp beam 1 of the invention consists of a hollow metal cylinder 2, which is mounted at each end onto a support 3 by way of a bearing 4. The cylinder 2 may thus rotate on the bearing 4 in respect of the support 3, which is besides provided with a clamp 5, normally loose and by tightening of which the cylinder 2 can be stopped from rotating.
  • The support 3 is made so as to support also the torsion bar 6, which is housed inside the hollow cylinder 2 in an eccentric position, namely with its axis 6' parallel to the axis 2' of the cylinder 2 but spaced therefrom, as clearly evidenced in the figures of the drawing. The bar 6 is locked to the support 3 by a second clamp 7 of said support, normally tightened, and its end is mounted in a conventional way onto the frame 8 of the loom.
  • Reference 9 indicates contrast spring means acting on the warp beam-torsion bar unit through a lever 10 provided with a toothing 11 for hooking the spring 9 into a plurality of positions, to which correspond variable contrast actions of said spring 9.
  • With the illustrated arrangement, the size of the unit comprising the warp beam and the torsion bar therefor is notably reduced, the dimensions being - as clearly evident from the above description and drawing - simply those of the warp beam (within whose cylinder the torsion bar is housed). Furthermore, in said arrangement, the point in which the resultant of the warp tensions is applied is very close to the axis of the torsion bar, which forms the fulcrum of application thereof; the torque being generated by said resultant is thereby small (having an arm six or seven times smaller than that of the conventional arrangements), with the considerable advantage of allowing to use a contrast system being less stressed, so reducing the dimensions even further.

Claims (1)

  1. A warp beam in a weaving loom, wherein a torsion bar is associated to the hollow cylinder of the warp beam itself, characterized in that the torsion bar (6) is positioned inside the hollow cylinder (2) of the warp beam (1 with its own axis parallel to but spaced from the axis of said cylinder (2), two end supports (3) connecting the cylinder (2) to the torsion bar (6) by means of clamp (7) provided between the support (3) and the bar (6) and a clamp (5) and bearing (4) provided between the support (3) and the cylinder (2).
EP83102497A 1982-03-25 1983-03-14 Warp beam with inner torsion bar for weaving looms Expired EP0090249B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83102497T ATE20913T1 (en) 1982-03-25 1983-03-14 WARP BEEAM WITH INTERNAL TORSION BAR FOR LOOMS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8221340U IT8221340V0 (en) 1982-03-25 1982-03-25 THREAD HOLDER WITH INTERNAL TORSION BAR FOR WEAVING FRAMES.
IT2134082U 1982-03-25

Publications (2)

Publication Number Publication Date
EP0090249A1 EP0090249A1 (en) 1983-10-05
EP0090249B1 true EP0090249B1 (en) 1986-07-23

Family

ID=11180341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102497A Expired EP0090249B1 (en) 1982-03-25 1983-03-14 Warp beam with inner torsion bar for weaving looms

Country Status (4)

Country Link
EP (1) EP0090249B1 (en)
AT (1) ATE20913T1 (en)
DE (1) DE3364616D1 (en)
IT (1) IT8221340V0 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0109472B1 (en) * 1982-10-26 1986-09-10 GebràœDer Sulzer Aktiengesellschaft Warp tensioning device on a weaving loom
CN108977999B (en) * 2018-09-12 2023-07-04 太平洋纺织机械（常熟）有限公司 Coiling cloth pressing device of shuttleless loom

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214619B (en) * 1957-04-26 1966-04-14 Willy Grob Chain tree brake for looms
PL83493B1 (en) * 1973-02-19 1975-12-31
DE2746034A1 (en) * 1976-10-18 1978-04-20 Vandewiele Fond Atel Brake mechanism for a loom warp beam - automatically maintains constant wind-off tension in the warp yarns by controlling tension in brake band from yarn winding dia.

Also Published As

Publication number Publication date
IT8221340V0 (en) 1982-03-25
DE3364616D1 (en) 1986-08-28
ATE20913T1 (en) 1986-08-15
EP0090249A1 (en) 1983-10-05

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