EP0310845A2 - Vorrichtung zum Einbringen von Strickschlossteilen während des Betriebes an Rundstrickmaschinen für Strümpfe, Strickwaren und dergleichen - Google Patents

Vorrichtung zum Einbringen von Strickschlossteilen während des Betriebes an Rundstrickmaschinen für Strümpfe, Strickwaren und dergleichen Download PDF

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Publication number
EP0310845A2
EP0310845A2 EP88115285A EP88115285A EP0310845A2 EP 0310845 A2 EP0310845 A2 EP 0310845A2 EP 88115285 A EP88115285 A EP 88115285A EP 88115285 A EP88115285 A EP 88115285A EP 0310845 A2 EP0310845 A2 EP 0310845A2
Authority
EP
European Patent Office
Prior art keywords
slider
needle cylinder
knitting
linear motor
movement
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.)
Withdrawn
Application number
EP88115285A
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English (en)
French (fr)
Other versions
EP0310845A3 (de
Inventor
Francesco Lonati
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.)
Lonati SpA
Original Assignee
Lonati SpA
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Filing date
Publication date
Application filed by Lonati SpA filed Critical Lonati SpA
Publication of EP0310845A2 publication Critical patent/EP0310845A2/de
Publication of EP0310845A3 publication Critical patent/EP0310845A3/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/32—Cam systems or assemblies for operating knitting instruments

Definitions

  • the present invention relates to a device for inserting knitting cams during operation in circular knitting machines for stockings, knitwear and the like.
  • knitting cams are provided which can be inserted or extracted, according to requirements, in the grooves of the needle cylinder so as to vary the paths followed by the needle butts.
  • These knitting cams can generally have two insertion positions, and some of the needles are provided with long butts and others with short butts, so that by varying the insertion position of the cams it is possible to put to work only the needles having long butts or all the needles.
  • the knitting cams are inserted into or expelled from the cam assemblies of the needle cylinder with a movement in a direction substantially perpendicular to the axis of the needle cylinder by means of levers which are actuated by a main drum which has the function of a machine programming element.
  • Said main drum has, on its surface, a certain number of raised portions or control cams which, upon rotation of the main drum about its axis, actuate, by means of mechanical connections, the levers which in turn act on the knitting cams, causing their insertion or expulsion.
  • Such known types of device have the disadvantage of a complicated mechanical structure which compulsorily requires continuous checks and adjustments to ensure an adequate operational reliability of the machine.
  • the main drum furthermore allows the execution of a limited number of knittings patterns, which must be chosen by the purchaser and can be varied, after purchase, only by changing the control cams mounted on the main drum.
  • step motors Considering the fact that research in this field is aimed at a continuous increase in the speed of rotation of the needle cylinder in order to increase production, the use of step motors has shown some limitations regarding the speed of operative insertion or expulsion of the cams at the high actuation speeds obtainable and regarding the precision of the movements imparted to the cams.
  • the aim of the present invention is to solve the above described problems by providing a device which allows the operative insertion and expulsion of the knitting cams in extremely short times, so as to be usable on machines with high operating speeds to fully employ the productive potential of modern knitting machines for stockings, knitwear and the like.
  • an object of the invention is to provide a device which achieves high precision and repeatability in the actuation of the knitting cams.
  • a device for inserting knitting cams during operation in circular knitting machines for stockings, knitwear and the like comprising at least one slider arranged laterally facing the needle cylinder of the machine and movable in a direction substantially perpendicular to the axis of the needle cylinder, said slider being rigidly associated with a knitting cam selectively engageable, upon movement of said slider, with needle control elements, characterized in that it comprises a linear motor acting on said slider and actuated by an electronic machine control element to impart to said knitting cam preset movements with respect to said needle cylinder.
  • the device according to the invention comprises a frame 2 which is fixed to the supporting structure 3 of a circular knitting machine 4 for stockings and slideably supports a slider 5, movable in a direction substantially perpendicular to the axis 6 of the needle cylinder 7 of the machine.
  • the end of the slider 5 is directed towards the needle cylinder 7 and is rigidly associated with a knitting cam 8 which, upon the movement of the slider 5 in a direction perpendicular to the axis 6 of the needle cylinder, is engageable with, or disengageable from, needle control elements 9.
  • said control elements are constituted by the butts 9a of the needles 9 which protrude radially from the grooves 10 defined in a known manner on the lateral surface of the needle cylinder 7.
  • the device comprises a linear motor 11 which acts on the slider 5 to obtain its movement in a radial direction with respect to the needle cylinder and is actuated by means of an electronic control element 12 which controls the various knitting operations of the machine.
  • the linear motor 11 is constituted by a body 13 made of ferromagnetic material which has three expansions 13a, 13b, 13c joined by a crosspiece 13d which are substantially parallel to one another.
  • Blocks 14 in permanent magnetic material are fixed on the two end expansions 13a and 13c, on the side directed towards the intermediate expansion 13b-.
  • An armature 15 is mounted on the intermediate expansion 13b and is movable along said expansion 13b.
  • a winding 16 is arranged on the armature 15 and is supplied with direct current so as to generate an electromagnetic force which causes movement of the armature 15 with respect to the body 13 of the linear motor.
  • the armature 15 is connected to a shaft 17 which constitutes the output shaft of the linear motor 11.
  • the linear motor 11 is arranged on the frame 2 so that its actuation direction is parallel to the direction of movement of the slider 5, and the shaft 17 of the linear motor is rigidly associated with the slider 5 so that the actuation of the linear motor directly causes the movement of the slider 5 along its direction of sliding relatively to the frame 2.
  • the slider 5 is slideably accommodated in a seat 18 which is defined in the frame in a direction perpendicular to the axis 6 of the needle cylinder 7, and between the slider 5 and the seat 18 coupling means 19 with low friction coefficient are interposed so that the actuation of the linear motor 11 requires a reduced amount of power.
  • Said coupling means 19 are constituted by balls 20 which are accommodated in grooves 21 defined on the surfaces of the slider 5 and of the seat 18 which are arranged mutually facing.
  • the device according to the invention furthermore advantageously comprises means 22 for detecting movement of the slider 5 with respect to the needle cylinder 7.
  • the detector means 22 are constituted by a known linear transducer, which has a fixed part 23a rigidly associated with the frame 2 and by a movable part 23b rigidly associated with the shaft 17 of the linear motor 11.
  • the linear transducer may be of the type constituted by a solenoid winding which is fed with low-intensity current and is arranged in the fixed part 23a.
  • the movable part 23b is constituted by a pin made of ferromagnetic material which, according to the movement of the slider 5, penetrates more or less into the solenoid along its axis.
  • the insertion of the pin in the solenoid determines a variation of the potential difference across the ends of said solenoid which can be detected and is a function of the length of the pin present inside said solenoid.
  • the linear transducer is connected to the electronic machine control element 12 which, according to a control program, checks the actual movement of the slider 5 and, according to what it detects, may act or not act on the linear motor 11 to correct said movement.
  • the linear motor 11 is connected to the electronic machine control element 12 ia a printed circuit 24 arranged inside the frame 2.
  • the linear transducer 23 may also be connected to said printed circuit 24 via a connecting cable 25.
  • the frame 2 is mounted on the supporting structure of the machine at a level corresponding to the lower end of the needles and the knitting cams act directly on the needle butts, but obviously the device, according to the invention, may be employed for the insertion of cams which actuate sliders or sub-needles.
  • control element 12 according to the different knitting operations which the machine is to perform, moves the cam 8 to engage with or disengage from the butts 9a of the needles 9 by actuating the linear motor 11.
  • the device according to the invention fully achieves the intended aim since, by having very high speeds of insertion and expulsion of the knitting cams, it can be successfully employed even on very fast machines without entailing a slowing of the machine during said operation of insertion or expulsion of the knitting cams.
  • the presence of a closed-loop control of the movement of the cams ensures great precision and repeatability of said movement with equal precision for a great number of times, without requiring checking or adjustment interventions.
  • this greater precision it is possible to provide a plurality of insertion positions of each knitting cam, as opposed to the usual two insertion positions of conventional machines, and correspondingly provide needle butts having mutually different lengths so as to increase the types of knitting which the machine can carry out.
  • the materials employed may be any according to the requirements and to the state of the art.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP88115285A 1987-10-06 1988-09-16 Vorrichtung zum Einbringen von Strickschlossteilen während des Betriebes an Rundstrickmaschinen für Strümpfe, Strickwaren und dergleichen Withdrawn EP0310845A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2216387 1987-10-06
IT22163/87A IT1222838B (it) 1987-10-06 1987-10-06 Dispositivo per l'inserimento in lavoro di camme di lavorazione in macchine circolari per maglieria,calzetteria e simili

Publications (2)

Publication Number Publication Date
EP0310845A2 true EP0310845A2 (de) 1989-04-12
EP0310845A3 EP0310845A3 (de) 1990-07-04

Family

ID=11192440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115285A Withdrawn EP0310845A3 (de) 1987-10-06 1988-09-16 Vorrichtung zum Einbringen von Strickschlossteilen während des Betriebes an Rundstrickmaschinen für Strümpfe, Strickwaren und dergleichen

Country Status (4)

Country Link
EP (1) EP0310845A3 (de)
JP (1) JPH01111050A (de)
CS (1) CS276133B6 (de)
IT (1) IT1222838B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376073A2 (de) * 1988-12-30 1990-07-04 LONATI S.p.A. Vorrichtung zum Aktivieren von Nadelschlossteilen an Rundstrickmaschinen
EP0467563A1 (de) * 1990-07-10 1992-01-22 Bentley Group Limited Rundstrickmaschine
US5174133A (en) * 1989-08-31 1992-12-29 Precision Fukuhara Works, Ltd. Apparatus and method for adjusting the stitch on a circular knitting machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1563200A (de) * 1968-03-01 1969-04-11
DE2361283A1 (de) * 1972-12-12 1974-07-11 Wildt Mellor Bromley Ltd Mustersteuereinrichtung fuer eine strickmaschine
EP0187269A2 (de) * 1984-12-10 1986-07-16 LONATI S.p.A. Rundstrickmaschine mit Vorrichtung zum in Betrieb setzen von Strickschlossteilen, insbesondere zum Stricken von Strümpfen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1563200A (de) * 1968-03-01 1969-04-11
DE2361283A1 (de) * 1972-12-12 1974-07-11 Wildt Mellor Bromley Ltd Mustersteuereinrichtung fuer eine strickmaschine
EP0187269A2 (de) * 1984-12-10 1986-07-16 LONATI S.p.A. Rundstrickmaschine mit Vorrichtung zum in Betrieb setzen von Strickschlossteilen, insbesondere zum Stricken von Strümpfen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin vol. 27, no. 1A, June 1984, pages 50 - 54; R.A.Schulz: "Lineair DC brushless motor" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376073A2 (de) * 1988-12-30 1990-07-04 LONATI S.p.A. Vorrichtung zum Aktivieren von Nadelschlossteilen an Rundstrickmaschinen
EP0376073A3 (de) * 1988-12-30 1991-09-04 LONATI S.p.A. Vorrichtung zum Aktivieren von Nadelschlossteilen an Rundstrickmaschinen
US5174133A (en) * 1989-08-31 1992-12-29 Precision Fukuhara Works, Ltd. Apparatus and method for adjusting the stitch on a circular knitting machine
EP0467563A1 (de) * 1990-07-10 1992-01-22 Bentley Group Limited Rundstrickmaschine
US5187951A (en) * 1990-07-10 1993-02-23 Bentley Group Limited Circular knitting machines

Also Published As

Publication number Publication date
IT1222838B (it) 1990-09-12
CS8806630A2 (en) 1989-11-14
EP0310845A3 (de) 1990-07-04
IT8722163A0 (it) 1987-10-06
CS276133B6 (en) 1992-04-15
JPH01111050A (ja) 1989-04-27

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