EP0343123A2 - Numerisch gesteuerte elektromagnetische Nadelauswahlvorrichtung für drei Stellungen an Rundstrickmaschinen mit hin- und hergehender Bewegung - Google Patents

Numerisch gesteuerte elektromagnetische Nadelauswahlvorrichtung für drei Stellungen an Rundstrickmaschinen mit hin- und hergehender Bewegung Download PDF

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Publication number
EP0343123A2
EP0343123A2 EP89830207A EP89830207A EP0343123A2 EP 0343123 A2 EP0343123 A2 EP 0343123A2 EP 89830207 A EP89830207 A EP 89830207A EP 89830207 A EP89830207 A EP 89830207A EP 0343123 A2 EP0343123 A2 EP 0343123A2
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EP
European Patent Office
Prior art keywords
cam
electromagnets
needles
point
selection
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Withdrawn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
EP89830207A
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English (en)
French (fr)
Other versions
EP0343123A3 (de
Inventor
Edoardo Furia
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0343123A2 publication Critical patent/EP0343123A2/de
Publication of EP0343123A3 publication Critical patent/EP0343123A3/de
Withdrawn legal-status Critical Current

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    • 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
    • D04B15/66—Devices for determining or controlling patterns ; Program-control arrangements
    • D04B15/68—Devices for determining or controlling patterns ; Program-control arrangements characterised by the knitting instruments used
    • D04B15/78—Electrical devices
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/26—Circular knitting machines with independently-movable needles for producing patterned fabrics
    • D04B9/28—Circular knitting machines with independently-movable needles for producing patterned fabrics with colour patterns
    • D04B9/36—Intarsia work obtained by reciprocatory action
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/26—Circular knitting machines with independently-movable needles for producing patterned fabrics
    • D04B9/38—Circular knitting machines with independently-movable needles for producing patterned fabrics with stitch patterns

Definitions

  • the present invention relates to an electromagnetic selection device with numerical control of the needles with three positions for meturon circular knitting machine with reciprocating movement, in particular for the manufacture of socks with design of "marquetry” or “mosaic".
  • each group consisting of an electromagnet interposed between two permanent magnets and a pressure cam arranged in correspondence of the magnet, which is located upstream of the electromagnet, in the direction of movement of the cylinder, to push against the latter the oscillating selector associated with an elastic pusher jack.
  • the electromagnet is controlled, according to an electronic program synchronized with the movement of the cylinder of the needles, by means of a modulated passage, an interruption or a reversal of the direction of the current, for, selectively, maintaining attracted and adhering to the magnets the oscillating selector and avoid the heel of the elastic jack from engaging a control cam and determine the deactivation of the corresponding needle, or release, that is to say push back, the said oscillating selector causing the heel of the elastic jack to be raised by the same control cam and the commissioning of the corresponding needle.
  • the main problems inherent in known electromagnetic systems are therefore related to the space available and the force of attraction provided by the selection electromagnets.
  • the space required to select three needle positions in the two directions of movement of the needle cylinder is such that it does not allow the use of cylinders with a diameter of less than four inches, when a diameter of 3 3/4 "or even 3 1/2" is required when a fineness greater than 120 needles is required.
  • the force of attraction or repulsion of the selection electromagnet being linked to the passage section of the magnetic flux, depends directly on the pitch of the needles as mentioned above, and therefore, in the case of great fineness, it is very low and once reached the saturation level, cannot be further increased, even by increasing the number of turns or current intensity. Insufficient magnetic force makes the balance between the elastic reaction of the selector, the inertia of moving parts, centrifugal force, friction, etc. very precarious, and therefore negatively limits the maximum attainable speed and operating safety. .
  • the present invention aims to eliminate the aforementioned drawbacks.
  • each oscillating selector oscillates about a median axis to allow that one of its ends cooperates with the pusher jack and with the corresponding pressure cam, and that the other end cooperates with a peripheral ring intended to keep the oscillating selectors attracted by the electromagnet, slightly separated from the magnets and electromagnets, so as to reduce the wear of the magnets and the resistive forces of friction.
  • the solution proposed by the present invention allows the realization of a circular knitting loom with reciprocating movement, with a cylinder of reduced dimensions, with the electromagnets of selection provided with poles of larger section and therefore with a higher force of attraction and at the same time, using pressure cams with ridges of length less than that of said poles to push the oscillating selectors directly against the electromagnets.
  • This solution also makes it possible to prevent the pusher jacks from being elastic and therefore to suppress the corresponding high elastic reaction forces which are difficult to control and the cantilever type embedding reactions. But above all, we get a circular knitting machine with high operating reliability even at very high speeds, low cost, easy adjustment, control and maintenance, even for the production of socks with a "marquetry" design.
  • a selection device, needle by needle, in a circular knitting machine with reciprocating movement comprises: - a cylinder 1 with needles 2 and sub needles on keys 4; - a pusher or pusher jack 6, associated with each key 4, which is rigid and has ends 7,8 in the shape of a heel and which is further pushed towards the outside of the cylinder 1 by a spring 9 which is fixed to a end 10 to cylinder 1 and which has a corrugated profile with two convexities 10a and 10b for contact, respectively, with the upper and lower zones of said pusher jack 6; - two oscillating selectors 11,12 made of ferromagnetic material, superimposed vertically, of the same shape, but symmetrical with respect to a horizontal line of separation, which are oscillating around a respective support point 13 median and with their respective back part oriented against the face of the pusher jack 6 so as to maintain the latter in its
  • Each of said selectors 11, 12 has a mixtilinear profile, with a convexity 14 for contact with the pusher jack 6, with a first end heel 15 for contact with a pressure cam 25, 26, with a second median heel 16 which constitutes the anchor of attraction of the electromagnetic selection system and with a third heel 17 for contact with a spacer ring 18, made of non-magnetic material and rotating in accordance with the cylinder of the needles, and whose role will be specified thereafter; several electromagnetic selection groups, each positioned between two consecutive power supplies 27 and comprising: - Two electromagnets 21, 22, one upper and the other lower, which are intended to act on the middle heels 16 of the above-mentioned oscillating selectors, upper 11 and lower 12, respectively; and each of the electromagnets 21,22 being interposed between two permanent retaining magnets 23a, 23b and 24a, 24b, respectively; two pressure cams 25, 26, one upper and the other lower, arranged on the same vertical passing through the axis of each group of electromagnets 21, 22, and
  • Such an arrangement of the electromagnets 21, 22 and the pressure cams 25, 26 makes it possible to use electromagnets having poles 28 of considerably increased cross-section compared to those used today for electromagnetic selection and to position said cams, with the vertex 29 which has a length less than that of the poles, directly in correspondence with the selection electromagnets 21, 22 without any risk of interference from the adjacent permanent magnets;
  • the cam 31 has a height such as to raise the lower heel 8 of the jacks 6 selected by the corresponding oscillating selector 12 not attracted, from the lower position A of floating point, to the intermediate position B of retained point (see Fig. 3); and the cam 30 has a height capable of lifting the upper heel 7 of the jacks 6 selected by the corresponding oscillating selector 11 not attracted, the lower position A of the floating point, to the upper position C of the discharged point (see Fig. 4).
  • the cam coat also includes traditional cams 34 for lowering the heels 5 of the wedge 4 and those 35 for lowering the heel 3 of the needles 2 during the formation of the mesh.
  • the heels 16 selectors 11,12 are kept slightly away from the respective electromagnets 21,22 even when they are attracted by them, so as to avoid wear of the electromagnets and magnets and to reduce friction, but keeping in the at the same time all the magnetic attraction of the electromagnets themselves, also thanks to the larger cross section of the poles.
  • the two electromagnets 21 and 22 are excited, and the oscillating selectors 11, 12, after having left the pressure cams 25 and 26, remain attracted by the electromagnets and, then by the permanent magnets 23b and 24b, that is to say tell those which are downstream of the electromagnets, in the direction of movement, so that the heels, upper 7 and lower 8, of the pusher jack 6 are retracted; in this position (see Fig. 1) they pass behind the cams 30 and 31, continuing in the lower position A until the next selection group, while the needle 2 remains out of service.
  • the lower electromagnet 22 is de-energized and abandons the heel 16 of the lower oscillating selector 12 so that the lower heel 8 of the pusher jack 6, pushed by the spring 10, engages the cam 31 (see FIG. 3), thereby cooperating the thrust of the spring 10 and the pressure cam 25, while the permanent magnet 23b located downstream of the electromagnet remains without effect.
  • the lower selector 12 is attracted by the permanent magnet 24b located downstream of the electromagnet 22 and the lower heel 8 of the pusher jack 6 cooperates with the profile 31b of the cam 31 and is raised in the intermediate position B , while the upper heel passes behind the cam 30. Meanwhile the cam 35 guides the heel 3 of the needle 2 for the formation of the retained point.
  • the cam 34 is responsible for bringing the key 4 and the pusher jack 6 to the lower position A for the following selection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP19890830207 1988-05-17 1989-05-11 Numerisch gesteuerte elektromagnetische Nadelauswahlvorrichtung für drei Stellungen an Rundstrickmaschinen mit hin- und hergehender Bewegung Withdrawn EP0343123A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT09411/88A IT1222246B (it) 1988-05-17 1988-05-17 Dispositivo di selezione elettromagnetica a controllo elettronico degli aghi a tre posizioni per macchina circolare da maglieria con moto al ernato
IT9411 1988-05-17

Publications (2)

Publication Number Publication Date
EP0343123A2 true EP0343123A2 (de) 1989-11-23
EP0343123A3 EP0343123A3 (de) 1991-10-30

Family

ID=11129739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890830207 Withdrawn EP0343123A3 (de) 1988-05-17 1989-05-11 Numerisch gesteuerte elektromagnetische Nadelauswahlvorrichtung für drei Stellungen an Rundstrickmaschinen mit hin- und hergehender Bewegung

Country Status (5)

Country Link
US (1) US4989425A (de)
EP (1) EP0343123A3 (de)
JP (1) JPH0214052A (de)
CS (1) CS8902923A3 (de)
IT (1) IT1222246B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487152A1 (de) * 1990-11-23 1992-05-27 MATEC S.r.l. Elektromagnetischer Selektor für mehrere Selektionslagen
EP0496133A1 (de) * 1990-12-21 1992-07-29 MATEC S.r.l. Rundstrickmaschine
EP0814187A3 (de) * 1996-06-20 1998-12-09 Precision Fukuhara Works, Ltd Rundstrickmaschine mit Jacquardmustervorrichtung für Zylindernadeln, Platinen oder Tellernadeln
SG89268A1 (en) * 1997-10-05 2002-06-18 Sipra Patent Beteiligung Control jack for knitting machines

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264308B (en) * 1992-02-21 1996-01-17 Uniplet As Knitting machine
DE4217419C1 (de) * 1992-05-26 1993-11-18 Terrot Strickmaschinen Gmbh Strickmaschine
CZ281720B6 (cs) * 1992-11-16 1996-12-11 Milan Fučík Volící zařízení jehel
EP0752490B1 (de) * 1995-07-04 2001-04-04 Precision Fukuhara Works, Ltd Rundstrickmaschine mit Jacquardmustersteuervorrichtung
US5803544A (en) * 1996-08-16 1998-09-08 H. O. Bostrom Company, Inc. Seat construction with removable side cushions
DE19743814B4 (de) * 1997-10-05 2009-01-08 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Strickmaschine
US7770417B2 (en) * 2005-11-18 2010-08-10 Santoni S.P.A. Magnetic actuator, particularly for selection devices in hosiery knitting machines or the like
US10612169B2 (en) * 2017-04-13 2020-04-07 Precision Fukuhara Works, Ltd. Knitting mechanism for circular knitting machine and the circular knitting machine
CN108866786B (zh) * 2018-08-08 2023-08-11 江苏金龙科技股份有限公司 一种纱嘴的驱动装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1180138A (en) * 1967-12-01 1970-02-04 Wildt Mellor Bromley Ltd Improved Patterning Mechanism for Knitting Machines.
US3972206A (en) * 1970-06-25 1976-08-03 VVU Zavodu vseobecneho strojirenstvi Pattern selector
US3987646A (en) * 1972-01-10 1976-10-26 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Magnetic actuator construction for a circular knitting machine
JPS5416204Y2 (de) * 1973-11-22 1979-06-26
DE2424190A1 (de) * 1974-05-17 1975-12-18 Erich Ribler Elektrisch gesteuerte mustervorrichtung an einer rundstrickmaschine
DE2519896C3 (de) * 1975-05-03 1980-11-06 Mayer & Cie Gmbh & Co, 7470 Albstadt Elektrisch gesteuerte Nadelauswahlvorrichtung für Strickmaschinen
DD126036A1 (de) * 1976-03-01 1977-06-15
US4738123A (en) * 1982-07-14 1988-04-19 Tibbals Jr Edward C Circular weft knitting machine
IT1198896B (it) * 1984-08-06 1988-12-21 Meritex Srl Macchina circolare da maglieria con sistemi di selezione elettromagnetici degli aghi
DE3541171A1 (de) * 1985-11-21 1987-05-27 Stoll & Co H Flachstrickmaschine mit nadelauswahleinrichtung
JPS63211348A (ja) * 1987-02-27 1988-09-02 株式会社　福原精機製作所 丸編機の選針装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487152A1 (de) * 1990-11-23 1992-05-27 MATEC S.r.l. Elektromagnetischer Selektor für mehrere Selektionslagen
US5241288A (en) * 1990-11-23 1993-08-31 Savio S.P.A. Electromagnetic selector equipped with a plurality of selection positions
EP0496133A1 (de) * 1990-12-21 1992-07-29 MATEC S.r.l. Rundstrickmaschine
US5205139A (en) * 1990-12-21 1993-04-27 Savio S.P.A. Method and device comprising deformable spring contraints for needle selection in a circular knitting machine
EP0814187A3 (de) * 1996-06-20 1998-12-09 Precision Fukuhara Works, Ltd Rundstrickmaschine mit Jacquardmustervorrichtung für Zylindernadeln, Platinen oder Tellernadeln
SG89268A1 (en) * 1997-10-05 2002-06-18 Sipra Patent Beteiligung Control jack for knitting machines

Also Published As

Publication number Publication date
US4989425A (en) 1991-02-05
EP0343123A3 (de) 1991-10-30
CS275163B2 (en) 1992-02-19
IT1222246B (it) 1990-09-05
CS8902923A3 (en) 1992-02-19
JPH0214052A (ja) 1990-01-18
IT8809411A0 (it) 1988-05-17

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