EP0326197A2 - Nadelauswahlsystem an Rundstrickmaschinen, insbesondere für Strümpfe - Google Patents

Nadelauswahlsystem an Rundstrickmaschinen, insbesondere für Strümpfe Download PDF

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Publication number
EP0326197A2
EP0326197A2 EP89200056A EP89200056A EP0326197A2 EP 0326197 A2 EP0326197 A2 EP 0326197A2 EP 89200056 A EP89200056 A EP 89200056A EP 89200056 A EP89200056 A EP 89200056A EP 0326197 A2 EP0326197 A2 EP 0326197A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
lever
jacks
needle selection
enter
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Withdrawn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
EP89200056A
Other languages
English (en)
French (fr)
Other versions
EP0326197A3 (de
Inventor
Paolo Brandani
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.)
Savio SpA
Savio Macchine Tessili SpA
Original Assignee
Savio SpA
Savio Macchine Tessili 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 Savio SpA, Savio Macchine Tessili SpA filed Critical Savio SpA
Publication of EP0326197A2 publication Critical patent/EP0326197A2/de
Publication of EP0326197A3 publication Critical patent/EP0326197A3/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Withdrawn legal-status Critical Current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
    • D04B15/66—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

  • This invention relates to a new system for needle selection in circular knitting machines, particularly for stockings, which combines the facility for a large number and variety of selections with low cost, considerable constructional simplicity, high reliability, very small overall size and a high operating speed.
  • the needles are selected by presser levers acting on the butts of reciprocating jacks which are urged out of the tricked rotating vertical guide cylinder by fixed radial thrust cams and either slide along fixed lifting cams or do not.
  • Said levers act on said butts by means of an inclined surface part so that they either selectively and gradually urge towards the interior of the tricked rotating guide cylinder those jacks which are not required to raise the overlying needle, with the result that said jacks are no longer acted on by said fixed lifting cams disposed externally to the cylinder and in close proximity thereto, or they allow to remain in a projecting position those jacks which are required to raise the respective overlying needle by the action of said fixed lifting cams.
  • the selective command to the presser levers is generally provided by the action of teeth projecting from a selection drum which undergoes one or more rotary steps for each revolution of the tricked cylinder.
  • a drum lever system of this type suffers however from considerable drawbacks.
  • many levels of butts are necessary, requiring lengthy jacks with consequent very tall and heavy tricked guide cylinders, leading to structurally complicated systems of considerable overall size.
  • the drum system is of poor versatility.
  • the pattern has to be changed by changing the arrangement of the projecting drum teeth, it therefore being necessary to halt the machine and remove the teeth and rearrange them according to the new required pattern. Lengthy down-times are therefore required for changing the pattern, with considerable negative influence on the machine production costs.
  • Each of said levers has a first vertically or axially inclined lead-in profile, along which the jack butt slides to rotate the lever, against the action of a return spring, with strokes of about 2 mm, into a position outside its path where said lever is retained by a permanent retention magnet, followed by a second profile with a radially inclined surface arranged to cooperate with said butt to cause the jack to re-enter the relative trick of the rotary cylinder.
  • the magnet is provided with a coil energised in accordance with a program to temporarily neutralize on command the retention action of the magnet to allow said return spring to act by returning the lever to the path of the jack to thus compel its butt to follow said second radially inclined profile of the lever, and cause the jack to return to its inactive position and produce no lifting.
  • the jack butt not only undergoes radial action by the lever but also acts vertically or axially on the lever.
  • the butts of successive jacks must be spaced apart in a manner which at least take account both of the time required for positioning the electromagnetically operated lever, and of its overall extension in terms of the overall size of its vertically or axially active profile and of its radial thrust profile.
  • many levels of jack butts must be used (for example with 34 needles per inch, as required for ladies' stockings, at least 16 levels are required) with the result that the vertical height of the system increases considerably.
  • levers must switch by about 2 mm between one butt and the next with high frequency, but as their size cannot be reduced extremely light levers must be used to minimize inertia at the expense of mechanical strength, together with very small but powerful magnets which generate a considerable heat to be dispersed by a suitable cooling circuit, this causing further constructional complications.
  • the object of the present invention is to obviate said drawbacks by providing a needle selection system in circular knitting machines which is of extremely small height and length, is constructionally simple and reliable, and allows very high selection rates and a very large number and variability of selections themselves.
  • the presser levers are used as hammers which, against return springs, are caused by electromagnets, by means of a partial stroke of about 0.5 mm, to strike during their flight those jack butts which are to be made to re-enter in order to keep them inactive.
  • the levers serves only to transmit kinetic energy by impact to those jack butts which are to be deactivated, and according to one characteristic of the invention this is such as to enable the jack to undergo its entire stroke of travel of about 2 mm to completely re-enter as the result of only a very small stroke of the lever, equal to about 1/4 that of the jack.
  • the active part of the hammer lever can be of very small size, ie of length just greater than the jack thickness, with the consequent possibility of covering the entire needle selection field with only a few levels of levers (2-3).
  • the jacks and thus the tricked cylinder are of very small height with a consequent very small overall size of the selection system not only in width but also in height, and a much reduced cost and machining requirement.
  • the potentially very small dimensions of the presser levers and their very reduced travel stroke mean that operating frequencies exceeding 200 Hertz can be obtained, ie much higher than those obtainable with known systems, and that smaller less powerful electromagnets can be used, with consequent smaller overall size and lesser heat to be dispersed.
  • the reference numeral 1 indicates a cylinder rotating in the direction of the arrow 2 and comprising axial tricks 3 acting as vertical guides for reciprocating jacks 4, 4′, 4 ⁇ , 4′′′..., supporting corresponding needles 5, 5′, 5 ⁇ , 5′′′... Said reciprocating jacks 4....4′′′...
  • Said presser device 9 substantially consists according to the invention of a lever 11 pivoted at 12 on a rigid fixed support 13 to act with its end 15, against the action of a return spring 14, as an armature for a control electromagnet 16 which is suitably energized by the programmer 17.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP19890200056 1988-01-27 1989-01-11 Nadelauswahlsystem an Rundstrickmaschinen, insbesondere für Strümpfe Withdrawn EP0326197A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8819220A IT1216712B (it) 1988-01-27 1988-01-27 Sistema perfezionato di selezione degli aghi nelle macchine circolari per maglieria ed in particolareper calze.
IT1922088 1988-01-27

Publications (2)

Publication Number Publication Date
EP0326197A2 true EP0326197A2 (de) 1989-08-02
EP0326197A3 EP0326197A3 (de) 1991-11-21

Family

ID=11155898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890200056 Withdrawn EP0326197A3 (de) 1988-01-27 1989-01-11 Nadelauswahlsystem an Rundstrickmaschinen, insbesondere für Strümpfe

Country Status (3)

Country Link
EP (1) EP0326197A3 (de)
JP (1) JPH01314761A (de)
IT (1) IT1216712B (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1804350A1 (de) * 1967-10-24 1970-05-14 Lebocey & Cie Georges Verfahren und Vorrichtung zum Auswaehlen der Stricknadeln oder der Strickhilfsmittel auf Strickmaschinen und mit dieser Vorrichtung versehene Strickmaschine
FR1594994A (de) * 1968-12-10 1970-06-08
CH492055A (de) * 1968-06-22 1970-06-15 Terrot Soehne & Co C Schalteinrichtung mit Schaltmagnet für Rundstrickmaschinen
US3662572A (en) * 1969-04-30 1972-05-16 Francesco Lonati Jack selection device for circular knitting machines
GB2034360A (en) * 1978-10-10 1980-06-04 Schieber Universal Maschf Electrically controlled selecting devices for the needles of a flat knittin machine
EP0319007A1 (de) * 1987-12-04 1989-06-07 SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH Verfahren zum Antrieb der Selektions-Nadelstösser einer Strickmaschine und Vorrichtung zur Durchführung dieses Verfahrens

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1804350A1 (de) * 1967-10-24 1970-05-14 Lebocey & Cie Georges Verfahren und Vorrichtung zum Auswaehlen der Stricknadeln oder der Strickhilfsmittel auf Strickmaschinen und mit dieser Vorrichtung versehene Strickmaschine
CH492055A (de) * 1968-06-22 1970-06-15 Terrot Soehne & Co C Schalteinrichtung mit Schaltmagnet für Rundstrickmaschinen
FR1594994A (de) * 1968-12-10 1970-06-08
US3662572A (en) * 1969-04-30 1972-05-16 Francesco Lonati Jack selection device for circular knitting machines
GB2034360A (en) * 1978-10-10 1980-06-04 Schieber Universal Maschf Electrically controlled selecting devices for the needles of a flat knittin machine
EP0319007A1 (de) * 1987-12-04 1989-06-07 SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH Verfahren zum Antrieb der Selektions-Nadelstösser einer Strickmaschine und Vorrichtung zur Durchführung dieses Verfahrens

Also Published As

Publication number Publication date
EP0326197A3 (de) 1991-11-21
IT8819220A0 (it) 1988-01-27
JPH01314761A (ja) 1989-12-19
IT1216712B (it) 1990-03-08

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