EP0279309A2 - Elément de commande électromagnétique à grande vitesse, notamment pour des dispositifs de sélection à des métiers à tricoter des bas et semblables - Google Patents

Elément de commande électromagnétique à grande vitesse, notamment pour des dispositifs de sélection à des métiers à tricoter des bas et semblables Download PDF

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Publication number
EP0279309A2
EP0279309A2 EP88101778A EP88101778A EP0279309A2 EP 0279309 A2 EP0279309 A2 EP 0279309A2 EP 88101778 A EP88101778 A EP 88101778A EP 88101778 A EP88101778 A EP 88101778A EP 0279309 A2 EP0279309 A2 EP 0279309A2
Authority
EP
European Patent Office
Prior art keywords
lever
electromagnetic actuator
frame
ledge
wear
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Withdrawn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
EP88101778A
Other languages
German (de)
English (en)
Other versions
EP0279309A3 (fr
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
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 Lonati SpA filed Critical Lonati SpA
Publication of EP0279309A2 publication Critical patent/EP0279309A2/fr
Publication of EP0279309A3 publication Critical patent/EP0279309A3/fr
Withdrawn legal-status Critical Current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
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/68—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used
    • D04B15/78—Electrical devices

Definitions

  • the present invention relates to a high speed electromagnetic actuator, particularly for selection devices in knitting machines for hosiery and the like.
  • Electromagnetic actuators are known which, due to their reduced bulk and high speed of actuation, are particularly suitable for controlling selection devices in knitting machines for hosiery and the like.
  • Some types of electromagnetic actuators substantially comprise a frame which oscillably supports a lever having a portion pivotally connected to the frame and an electromagnet which acts on the lever so as to cause its oscillation in one direction, while the return oscillation is effected by a permanent magnet.
  • Electromagnetic actuators are also known which utilize two electromagnets acting in opposite directions on the lever to effect its oscillation in both directions.
  • the lever In order to achieve actuation of sufficiently high speed without overloading the windings of the electromagnet or of the electromagnets, the lever usually has ledges which extend in the direction of the nucleus of each electromagnet.
  • a member of anti-magnetic material usually phosphor bronze, which has the double function of absorbing the impact of the ledge and impeding adhesion of the ledge to the electromagnet.
  • the main aim of the present invention is to solve the above-mentioned problems by providing an electromagnetic actuator which is more reliable in use, and which has an increased working life and a faster actuating speed with respect to known types.
  • an object of the invention is to provide an actuator which can withstand very high actuation speeds without incurring excessive heating.
  • Another object of the present invention is to provide an actuator having a structure which is easy to manufacture and which has a bulk which permits its installation in knitting machines for hosiery, even of small diameter and having a number of feeds.
  • a high speed electromagnetic actuator particularly for selection devices in knitting machines for hosiery and the like comprising a frame oscillably supporting a lever having a portion pivotally connected to said frame and at least one electromagnet acting on said lever, to cause oscillation thereof, said lever having at least one ledge made of ferromagnetic material and extending in the direction of the nucleus of said electromagnet. characterized in that a synthetic, anti-wear, anti-magnetic material is moulded at least on the reciprocally facing portions of said ledge and said nucleus.
  • the electromagnetic actuator generally indicated by the reference numeral 1, comprises a frame 2 oscillably supporting a lever 3 pivotally connected to the frame and an electromagnet, which acts on the lever for causing its oscillation.
  • two electromagnets 4 and 5 are provided which act in opposition on the lever 3, so as to cause oscillation thereof in both directions with equal oscillation speeds.
  • the frame 2 is made of ferromagnetic material and has a base side 6 wherefrom extend, in a substantially perpendicular direction, two ledges 7 and 8 which constitute the two nuclei of the electromagnets 4 and 5, around which are arranged the electric windings 9 and 10.
  • a third legde 11 supporting at its end remote from the base 6 the lever 3 pivotally connected thereto at its intermediate portion.
  • the lever 3 is substantially parallel to the base 6 of the frame and advantageously has two ledges 12 and 13, which extend from the same side of the lever but from the opposite parts with respect to its fulcrum, in the direction of the nuclei 7 and 8 of the electromagnets.
  • a synthetic anti-wear, anti-­magnetic material 20 is moulded on at least one of the reciprocally facing portions of the lever and of the nuclei of the electromagnets 4 and 5 .
  • the synthetic anti-wear, anti-magnetic material is moulded on the free end of the ledges 12 and 13, but it could be moulded on the nuclei of the electromagnets so as to efficiently effect an anti-shock and anti-adhesion action between the ledges 12 and 13 and the nuclei of the electromagnets.
  • the lever 3 has an intermediate portion 3a pivotally connected to the frame 2 and made of a moulded, synthetic, anti-wear and anti-magnetic material to thus reduce wear at the point of oscillable connection between the lever and the frame.
  • a selection device constituted by the selection lever 14 oscillatable to interfere with or to avoid interference with the butts 15a of the selectors 15 in a knitting machine, can advantageously be made of moulded synthetic, anti-wear and anti-magnetic material with a bifurcated conformation for coupling with the relative selection lever.
  • the above-cited materials may also be used for the intermediate portion 3a and for the longitudinal end 3b of the lever 3 with the advantage of having, particularly for the intermediate portion an optimum lubrication, and for the extremity 3b an extremely low weight which permits the achievement of high actuation speeds.
  • the frame 2 and the lever 3, as mentioned heretofore, are made of ferromagnetic material and constitute two magnetic circuits each powered by an electromagnet.
  • the base side of the frame 2 and the lever 3 have, at the third ledge 11 of the frame, a reduction in thickness 17. More precisely, in the case of the lever 3, the reduction in thickness may affect only the ferromagnetic material.
  • the electromagnetic actuator according to the invention fully meets the proposed objects in that the adoption of the portions in synthetic anti-magnetic and anti-wear material at the specific zone of the lever achieves a reduction of wear, improved lubrication, and a reduction of the overall weight of the lever which permits the achievement of an extremely high speed of oscillation or actuation response.
  • Another advantage is that of obtaining optimum balance of the lever with respect to the fulcrum so as to have equal stressing of the electromagnets.
  • a not least advantage is the extremely small bulk of the actuator which renders it particularly suitable for use in selection devices in knitting machines for hosiery and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP88101778A 1987-02-16 1988-02-08 Elément de commande électromagnétique à grande vitesse, notamment pour des dispositifs de sélection à des métiers à tricoter des bas et semblables Withdrawn EP0279309A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1939687 1987-02-16
IT8719396A IT1235468B (it) 1987-02-16 1987-02-16 Attuatore elettromagnetico ad elevata velocita' di azionamento, in particolare per dispositivi di selezione in macchine per maglieria, cal- zetteria e simili

Publications (2)

Publication Number Publication Date
EP0279309A2 true EP0279309A2 (fr) 1988-08-24
EP0279309A3 EP0279309A3 (fr) 1990-01-31

Family

ID=11157334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101778A Withdrawn EP0279309A3 (fr) 1987-02-16 1988-02-08 Elément de commande électromagnétique à grande vitesse, notamment pour des dispositifs de sélection à des métiers à tricoter des bas et semblables

Country Status (4)

Country Link
EP (1) EP0279309A3 (fr)
JP (1) JPS63227844A (fr)
CS (1) CS266347B2 (fr)
IT (1) IT1235468B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0397254A1 (fr) * 1989-05-11 1990-11-14 SAVIO S.p.A. Dispositif pour la sélection d'aiguilles dans un métier à tricoter circulaire au moyen de leviers pivotants à faible inertie contrôlés électro-magnétiquement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1307164A (fr) * 1961-11-30 1962-10-19 Kienzle Uhrenfabriken Ag Armature mobile d'électro-aimant pour montre à remontage électromagnétique
FR1594994A (fr) * 1968-12-10 1970-06-08
US3573690A (en) * 1969-10-06 1971-04-06 Ncr Co Electrical solenoid assembly
EP0170993A2 (fr) * 1984-08-09 1986-02-12 LONATI S.p.A. Dispositif de sélection d'aiguilles pour un métier à tricoter circulaire notamment pour un métier à tricoter des bas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1307164A (fr) * 1961-11-30 1962-10-19 Kienzle Uhrenfabriken Ag Armature mobile d'électro-aimant pour montre à remontage électromagnétique
FR1594994A (fr) * 1968-12-10 1970-06-08
US3573690A (en) * 1969-10-06 1971-04-06 Ncr Co Electrical solenoid assembly
EP0170993A2 (fr) * 1984-08-09 1986-02-12 LONATI S.p.A. Dispositif de sélection d'aiguilles pour un métier à tricoter circulaire notamment pour un métier à tricoter des bas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0397254A1 (fr) * 1989-05-11 1990-11-14 SAVIO S.p.A. Dispositif pour la sélection d'aiguilles dans un métier à tricoter circulaire au moyen de leviers pivotants à faible inertie contrôlés électro-magnétiquement
US5095721A (en) * 1989-05-11 1992-03-17 Savio S.P.A. Needle section device having rocker levers in a circular machine

Also Published As

Publication number Publication date
EP0279309A3 (fr) 1990-01-31
IT1235468B (it) 1992-08-19
CS96788A2 (en) 1989-02-10
CS266347B2 (en) 1989-12-13
JPS63227844A (ja) 1988-09-22
IT8719396A0 (it) 1987-02-16

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