EP0107798B1 - System to obtain a reciprocal differentiated pressure in the contact between two cylinders in looms - Google Patents

System to obtain a reciprocal differentiated pressure in the contact between two cylinders in looms Download PDF

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Publication number
EP0107798B1
EP0107798B1 EP83109669A EP83109669A EP0107798B1 EP 0107798 B1 EP0107798 B1 EP 0107798B1 EP 83109669 A EP83109669 A EP 83109669A EP 83109669 A EP83109669 A EP 83109669A EP 0107798 B1 EP0107798 B1 EP 0107798B1
Authority
EP
European Patent Office
Prior art keywords
tube
cloth
bar
pressure
inner structure
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
EP83109669A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0107798A1 (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.)
VILMINORE OFFICINE MECCANICHE SpA
Original Assignee
VILMINORE OFFICINE MECCANICHE 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 VILMINORE OFFICINE MECCANICHE SpA filed Critical VILMINORE OFFICINE MECCANICHE SpA
Priority to AT83109669T priority Critical patent/ATE35703T1/de
Publication of EP0107798A1 publication Critical patent/EP0107798A1/en
Application granted granted Critical
Publication of EP0107798B1 publication Critical patent/EP0107798B1/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
    • D03D49/20—Take-up motions; Cloth beams

Definitions

  • This invention concerns a system to improve the contact pressure between two rollers - particularly the cloth-pulling roller and the cloth-pressing bar of a loom - allowing to obtain a proper pressure of mutual contact along the whole length of said rollers.
  • a particular problemn is that of warp yarn tension and of the fabric adhering onto the cloth-pulling roller, this being an essential condition to obtain the "right feel" in the fabric and prevent even serious weaving defects (mainly determined by a change in the number of wefts per centimeter).
  • the present invention now proposes to fully solve this problem by providing a system which allows to obtain a proper pressure of mutual contact - between the cloth-pulling roller and the cloth-pressing bar - along the whole length of the loom, whereby the fabric perfectly adheres onto the roller around which it winds while being produced, even at the centre of the loom or in correspondence of any critical parts thereof.
  • the invention provides a system to improve the mutual contact between two rollers, characterized in that one of said rollers, particularly the cloth-pressing bar, is formed of a tube rotating about its own axis, and of an inner structure in said tube, which elastically presses against the inner surface thereof with a force directed to the line of contact between the rollers, the force exerted by said inner structure on the inner surface of the tube varying along the length of the roller.
  • the system according to the invention comprises a cloth-pulling roller 1, of conventional characteristics, to which there is associated a cloth-pressing bar 2 formed: of an external tube 3, provided with a suitable covering and mounted rotatable on two end supports 4, of a metal bar 5, which is elastically deformed in respect of its originally bent configuration and is arranged inside the tube 3, fixedly mounted therein by means of two pressing end supports 6, and of a bush 7, interposed at the centre of the unit between the bar 5 and the tube 3, so as to impart a pressure on this latter, while allowing the rotation thereof.
  • a cloth-pulling roller 1 of conventional characteristics, to which there is associated a cloth-pressing bar 2 formed: of an external tube 3, provided with a suitable covering and mounted rotatable on two end supports 4, of a metal bar 5, which is elastically deformed in respect of its originally bent configuration and is arranged inside the tube 3, fixedly mounted therein by means of two pressing end supports 6, and of a bush 7, interposed at the centre of the unit between the bar 5 and the tube 3, so as to impart
  • the two supports 4 for the tube 3 each comprise a shell 8, having an end pivoted in 9 and housing into a suitable seat at its centre one end of the tube 3, the other end of said shell 8 being subject to the action of a locking setscrew 10, by way of a spring 11.
  • the supports 6 each comprise a metal lever 12, having an end pivoted in 13 and housing at the centre one end of the bar 5, the rotation of which is prevented by suitable means 12A, the other end of said lever 12 being subject to the action of a locking setscrew 14.
  • the bar 5 has a deeply curved configuration, in respect of which it is elastically deformed by being bent until it can be inserted - substantially rectilinear - into the tube 3.
  • it is kept bent thanks to the supports 6, thereby imparting a strong elastic action of pressure onto the tube 3, through the bush 7; this guarantees a highly efficient and continuous contact between the tube 3 and the cloth-pulling roller 1, in the central part of said roller and of the loom (this part usually being the critical area where the structure and geometrical confrigura- tion of the cloth-pressing bar are likely to vary).
  • the critical area of contact between the two rollers 1 and 2 may obviously vary according to the structural characteristics of the loom, to its way of working, to the work being performed, and so on - thereby differing from the area subjected to the pressure of the bush 7 - it is understood that said bush 7 may have a varying length, or may even be replaced by two or more bushes, according to requirements.
  • FIG 4 illustrates the use of two bushes 15 and 16, suitably spaced and interposed between the bar 5 and the tube 3 of the cloth-pressing bar 2, in the central part of the loom.
  • the cloth-pressing bar 2 again comprises an external rotating tube 3 cooperating with the cloth-pulling roller 1; however, the unit comprising the bar 5 and the bush 7 (solution of figure 1) has been replaced by a barrel-shaped bar 17, elastically bent and kept so deformed by the supports 6, whereby its generatrix contacting the tube 3 results substantially rectilinear.
  • the bar 17 produces the same effect as the aforespecified unit, thereby ensuring a proper and continuous contact between the cloth-pressing bar 2 and the cloth-pulling roller 1.
  • the cloth-pressing bar 2 is obtained by associating to a tube 3 - rotating on end supports, as in the case of figure 1 - a rectilinear bar 18 having, throughout its length, a projecting profile 19 which is suitably shaped in correspondence of the areas whereon a supplementary pressure is required.
  • Said bar 18 is mounted with its ends 20, external to the tube 3, rotating on supports 21, and it is subjected to torsion by screws 22 acting on levers 23 which are keyed on said bar close to its ends (see figure 8); the screws 22 screw into proper seats fixed on the loom casing, as shown in 24.
  • the structure of the cloth-pressing bar 2 comprises a tube 29, rotating within fixed end supports 30, and a fixed tube 31 mounted inside said tube 29.
  • Two pluralities of elements 32 radially project from the fixed tube 31 (figures 9 and 10), said elements being mounted as pistons (see enlarged detail of figure 11) along a generatrix of said tube 31 and being apt to press against the inner wall of the tube 29.
  • the elements 32 are distributed according to a law determined by the contact pressure required between the rollers 1 and 2 along the different parts of the loom; as clearly shown in figure 9, said distribution is uneven, since a greater number of said elements is provided in correspondence of the central part of the loom.
  • Fluid under pressure is sent into the properly sealed fixed tube 31, to drive the elements 32 partially out of their seats in the wall of said tube and push them against the rotating tube 29, as indicated by the arrow 33 in figure 11.
  • this embodiment will evidently provide for sealing means, for the fluid under pressure, between the elements 32 and the seats in the wall of the fixed tube 31, wherein said elements are mounted slidable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Woven Fabrics (AREA)
EP83109669A 1982-10-01 1983-09-28 System to obtain a reciprocal differentiated pressure in the contact between two cylinders in looms Expired EP0107798B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83109669T ATE35703T1 (de) 1982-10-01 1983-09-28 System zum erhalten einer reziproken variation im kontaktdruck zwischen zwei rollen einer webmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8223573A IT1210942B (it) 1982-10-01 1982-10-01 Sistema per ottenere una pressione reciproca differenziata nel contatto fra due cilindri, in particolare fra il cilindro tirapezza e la barra pressapezza di un telaio di tessitura.
IT2357382 1982-10-01

Publications (2)

Publication Number Publication Date
EP0107798A1 EP0107798A1 (en) 1984-05-09
EP0107798B1 true EP0107798B1 (en) 1988-07-13

Family

ID=11208246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109669A Expired EP0107798B1 (en) 1982-10-01 1983-09-28 System to obtain a reciprocal differentiated pressure in the contact between two cylinders in looms

Country Status (5)

Country Link
EP (1) EP0107798B1 (xx)
AT (1) ATE35703T1 (xx)
DE (1) DE3377368D1 (xx)
HK (1) HK103390A (xx)
IT (1) IT1210942B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4110390A1 (de) * 1990-04-02 1991-10-10 Nuovo Pignone Spa Verbesserter warenabzug einer webmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3664648D1 (en) * 1985-12-06 1989-08-31 Sulzer Ag Draw-off device for the cloth in a textile machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4110390A1 (de) * 1990-04-02 1991-10-10 Nuovo Pignone Spa Verbesserter warenabzug einer webmaschine

Also Published As

Publication number Publication date
DE3377368D1 (en) 1988-08-18
EP0107798A1 (en) 1984-05-09
ATE35703T1 (de) 1988-07-15
HK103390A (en) 1990-12-14
IT1210942B (it) 1989-09-29
IT8223573A0 (it) 1982-10-01

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