EP0799919B1 - Device for carrying out the programming of rotary dobbies in weaving machines - Google Patents

Device for carrying out the programming of rotary dobbies in weaving machines Download PDF

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Publication number
EP0799919B1
EP0799919B1 EP97105168A EP97105168A EP0799919B1 EP 0799919 B1 EP0799919 B1 EP 0799919B1 EP 97105168 A EP97105168 A EP 97105168A EP 97105168 A EP97105168 A EP 97105168A EP 0799919 B1 EP0799919 B1 EP 0799919B1
Authority
EP
European Patent Office
Prior art keywords
lever
operating means
selection
engagement
disc
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
EP97105168A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0799919A1 (en
Inventor
Gian Luigi Cremonesi
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.)
FIMTEXTILE SpA
Original Assignee
FIMTEXTILE 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 FIMTEXTILE SpA filed Critical FIMTEXTILE SpA
Publication of EP0799919A1 publication Critical patent/EP0799919A1/en
Application granted granted Critical
Publication of EP0799919B1 publication Critical patent/EP0799919B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies

Definitions

  • the present invention relates to an improved device for carrying out the programming of rotary dobbies for the operation of heald frames in weaving machines.
  • the operating and control device for each stoppage of the main shaft, must be able to make the rotating shaft integral or not with an eccentric cam or similar device actuating the frame moving levers, resulting, in one case, in the change of position thereof and, in the other case, in the previous position being maintained.
  • the dobbies which operate the heald frames in weaving looms must therefore be controlled by means of special devices for carrying out the programming, which are designed to produce, by means of special actuators, the variation in the relative positions of the operating means which, in turn, vary the position of the frames.
  • This device intended for rotary dobbies of the type in which the heald frame operating rods are actuated by connecting rods each mounted on an eccentric ring rotating with respect to the main shaft of the dobby, which has moreover a disc made to rotate by said shaft and a selection lever pivotably hinged on said eccentric ring and designed to engage with said lever via one of its end teeth, through the action of a spring, comprises an operating lever rotating about a fixed fulcrum owing to the action of thrusting means and in opposition to spring-type recall means, so that the projecting end profiles of the same operating lever are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever so as to cause or avoid engagement thereof with the rotating disc, the rotation of the operating lever being performed during rotation of the main shaft.
  • one of the projecting end profiles of said operating lever is formed as a tooth pivotably hinged on the corresponding end of said lever, inside a recess having two diverging abutment walls, and kept in contact with one of them by a spring, so as to be able to oscillate until it makes contact with the other one so as to phase-displace the active engagement with said selection lever, in the condition of backwards movement of the dobby, and, correspondingly, the spring acting on the selection lever and the one acting on the toothed profile of the operating lever are dimensioned so that the action of the former cannot be exceeded by the action of the latter.
  • the present invention therefore relates to a device for carrying out the programming of rotary dobbies for the operation of the heald frames in weaving machines, of the type in which the heald frame operating levers are actuated by connecting rods each mounted on an eccentric ring rotating with respect to the main shaft of the dobby, which has moreover a disc made to rotate by said shaft and a selection lever pivotably hinged on said eccentric ring and designed to engage with said disc via one of its end teeth, through the action of a spring, said device comprising operating means which are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever for causing or avoiding the engagement thereof with the rotating disc, the action of said operating means being co-ordinated with the rotation of the main shaft, characterized in that said operating means comprise at least one electric linear stepper motor.
  • said operating means comprise a toggle lever rotating with its middle point about a fixed fulcrum so that projecting end profiles of the said lever are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever so as to cause or avoid the engagement thereof with the rotating disc and an electric linear stepper motor which controls rotation of said lever in both directions.
  • said operating means comprise two projections which are designed to engage with the end of the selection lever opposite to the toothed end and are arranged angularly spaced, and two electric stepper motors which control the engagement of said projections with said selection levers so as to cause or avoid engagement of the toothed end of the latter with the rotating disc.
  • the device according to the invention forms part of a dobby which comprises a rotating shaft 1 which has keyed onto it a connecting-rod element 2 shaped so as to have a projection 2A pivotably hinged at 3A with the operating rod 3 of heald frames 2B (not shown) and a substantially circular ring 2B which has two rollers 2C in opposite positions.
  • the centre of the connecting rod 2 has inserted inside it a bearing 4, the inner ring of which has mounted on it an eccentric cam 5 which is able to rotate, as can be seen further below, with respect to the shaft 1.
  • the eccentric cam 5 has mounted on it in an oscillating manner, by means of a rivet 6 or the like, a rocker lever 7, or selection lever, which has shaped ends 8 and 9 and, on its inner side, a tooth 11 opposite to the end 9.
  • a spring 12 arranged between the eccentric cam 5 and the end 9 of the lever 7 exerts a recall action on the lever 7 itself and thus tends to cause it to rotate so as to move the tooth 11 towards the axis of rotation of the shaft 1.
  • said shaft 1 has keyed onto it a disc 13, at the periphery of which there are formed two grooves 13A and 13B arranged diametrically opposite with respect to the centre of rotation of the disc 13 itself and which is located on the axis of the shaft 1.
  • the disc 13 has keyed onto it the inner ring of a bearing, the outer ring of which has keyed onto it the eccentric cam 5 for thus rotating about the shaft 1.
  • the disc 13 lies in the same position as the lever 7, such that the tooth of the latter is able to engage with one of two notches 13A or 13B and be disengaged therefrom.
  • the dobby is completed by an elbow-shaped operating lever 14, the ends of which have shaped projecting profiles 14A and 14B formed as one piece.
  • the operating lever 14 is able to oscillate, being mounted with its middle point about a fulcrum 14C, so as to assume different positions in which its shaped end profiles 14A and 14B are able to engage with or not engage with the end (8) of the selection levers (7) opposite to the toothed end (11).
  • the positions of the lever 14 are controlled by an electric stepper motor 15 shown acting in the vicinity of the end 14A of the lever 14, inside a suitable seating 14D thereof, so as to cause oscillations thereof positively controlled in both directions of rotation.
  • the dobby no longer has the operating lever 14, but a pair of projections 16 and 17 arranged, at a considerable angular distance from one another, so as to be able to engage directly with the end 8 of the selection lever 7 opposite to the toothed end 11 under the control of two electric linear stepper motors, 18 and 19 respectively.
  • eccentric cam 5 is integral with the rotating disc 13 which, rotating with the shaft 1 during the next half-turn, causes rotation with it of the eccentric cam 5 itself and hence the connecting rod 2 which, rotating, drives the frame operating rod 3, causing it to change position.
  • the motor 15 carries out the control for the next half-turn, i.e. in the example in question so as to keep the frame in the previous position. It therefore exerts a pressure against the end 14A of the lever 14 so as to cause anti-clockwise rotation of the same lever 14, which brings the profile 14B thereof into contact with the rear surface of the end 8 of the lever 7, which lever in the meantime has moved into a position opposite the end 14B of the lever 14.
  • the said lever 7 is thus obliged, continuing the rotation of the disc 13, to rotate about its own pin 6, causing the gradual emergence of the tooth 11 provided at the end faced by the recess 13A of the disc 13.
  • the eccentric cam 5 thus remains idle with respect to the disc 13, this causing the previous position of the heald frame controlled by the lever 3 to be maintained during the next half-turn, as desired.
  • the present invention ensures in a fairly convenient manner precise and reliable selection of the position of the heald frames, without it being necessary to stop rotation of the shaft at each half-turn, thus avoiding any possible jamming during this stage and allowing independent selection of the frames both during forwards movement and during reverse movement, at even very high dobby speeds, with important advantages in terms of the productivity of the weaving machine with which it is associated.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP97105168A 1996-04-04 1997-03-26 Device for carrying out the programming of rotary dobbies in weaving machines Expired - Lifetime EP0799919B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI000657A IT1283717B1 (it) 1996-04-04 1996-04-04 Dispositivo per attuare la programmazione di ratiere rotative in macchine di tessitura.
ITMI960657 1996-04-04

Publications (2)

Publication Number Publication Date
EP0799919A1 EP0799919A1 (en) 1997-10-08
EP0799919B1 true EP0799919B1 (en) 2001-08-08

Family

ID=11373872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97105168A Expired - Lifetime EP0799919B1 (en) 1996-04-04 1997-03-26 Device for carrying out the programming of rotary dobbies in weaving machines

Country Status (4)

Country Link
EP (1) EP0799919B1 (it)
JP (1) JPH108343A (it)
DE (1) DE69705982T2 (it)
IT (1) IT1283717B1 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20010670A1 (it) * 2001-03-29 2002-09-29 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative per macchine di tessitura comportante mezzi di comando a motore elettrico line
ITMI20022152A1 (it) * 2002-10-10 2004-04-11 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative per macchine di tessitura comportante mezzi di comando a motore elettrico lineare perfezionati

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1243890B (it) * 1990-11-05 1994-06-28 Giobbe Srl Dispositivo per il comando e controllo di una ratiera rotativa di macchine tessili con leva profilata a camma e relativi mezzi di contrasto cooperanti
IT1251107B (it) * 1991-07-25 1995-05-04 Costantino Vinciguerra Perfezionamenti in una ratiera rotativa ad altissima velocita'
IT1260291B (it) * 1992-12-18 1996-04-03 Lucio Burigana Ratiera rotativa

Also Published As

Publication number Publication date
ITMI960657A1 (it) 1997-10-04
DE69705982D1 (de) 2001-09-13
ITMI960657A0 (it) 1996-04-04
JPH108343A (ja) 1998-01-13
DE69705982T2 (de) 2002-04-04
EP0799919A1 (en) 1997-10-08
IT1283717B1 (it) 1998-04-30

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