EP0712952B1 - Elektromagnetisches Nadelauswahlsystem für Strickmaschinen - Google Patents

Elektromagnetisches Nadelauswahlsystem für Strickmaschinen Download PDF

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Publication number
EP0712952B1
EP0712952B1 EP95117676A EP95117676A EP0712952B1 EP 0712952 B1 EP0712952 B1 EP 0712952B1 EP 95117676 A EP95117676 A EP 95117676A EP 95117676 A EP95117676 A EP 95117676A EP 0712952 B1 EP0712952 B1 EP 0712952B1
Authority
EP
European Patent Office
Prior art keywords
needle
lifting
needles
cam
lower needle
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
EP95117676A
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German (de)
English (en)
French (fr)
Other versions
EP0712952A1 (de
Inventor
Ettore Dott. Ing. Negri
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.)
Harting Stiftung and Co KG
Original Assignee
Harting AG and Co KG
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 Harting AG and Co KG filed Critical Harting AG and Co KG
Publication of EP0712952A1 publication Critical patent/EP0712952A1/de
Application granted granted Critical
Publication of EP0712952B1 publication Critical patent/EP0712952B1/de
Anticipated expiration legal-status Critical
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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

  • FR-A-2 133 604 describes an electromagnetic selection system in which the lower needle into a first by means of permanent magnets End position for needle selection can be pivoted, whereby each electromagnetic element has at least two pairs of electromagnets with successively in the direction of the cylinder movement Has side-by-side pole pieces, which are identical Pulses at intervals according to the needle pitch receive.
  • the sub needle used has a first end to engage with a lifting cam and a second end to attach to the selection system, these ends on different Sides of a sub-needle pivot are arranged.
  • this system is in every groove of the rotating cylinder a knitting machine arranged a tilting sub-needle, which the function of the first mechanical selection element.
  • This sub needle can between two end positions, a lifting and a non-lifting position under the action of upper and lower permanent magnets and one Row of three electromagnets rotate, the magnets and electromagnets are attached to the stationary part of the machine and the Have cylinder-facing pole pieces.
  • the system requires a perfect one to function mutual comparison of the upper and lower permanent magnets, so a neutral position of the tilting sub-needle is specified before the selection and all the work is put on the electromagnets, those for pulling the lower needle out of the neutral position into the non-lifting position is required; so electromagnets arise because they are on the sub needle must be able to transmit the necessary energy from larger ones Dimensions than that of the Morat system, as well as greater energy requirements and larger time constant, which limits the maximum Selection frequency brings.
  • the aim of the present invention is to provide a selection system with more than one To create electromagnets per selection point, the electromagnets on a number of first selection elements that are more solid and stable are acting as the flexible element in the Morat system, one after the other smaller dimensions of the electromagnets and lower energy consumption to achieve what advantages in the speed of selection and reduced Space requirements compared to the North American Rockwell solution leads.
  • the present invention relates to a knitting machine having at least one row of needles which moves to form a knitted fabric relative to a system of cams for lifting and lowering, the machine comprising at least one selective lifting point for the needles.
  • the needle selection system comprises the features of a device according to claim 1.
  • An essential part of the gap is at least one electromagnetic element per selection point, integrated in the cam system.
  • This element comprises pole pieces which are close to the row of needles and are arranged in the sense of the relative movement mentioned, at least one permanent magnet in order to generate a magnetic field which is as uniform as possible between the pole pieces, and a number of electromagnets.
  • the pole shoes lying next to one another and arranged one after the other in the direction of movement of the row of needles with respect to the magnetic element comprise a first section which is only subject to the action of the permanent magnet and subsequent sections, the opposite field of one of the electromagnets being superimposed in each of these on the magnetic field of the permanent magnet can, in order to locally weaken the overall intensity of the magnetic field, and wherein these subsequent sections in the direction of movement of the row of needles have an extent which is equal to or less than the pitch of the grooves of the needle bed opposite the pole pieces;
  • the device has an electronic control unit to selectively send current pulses to each of the electromagnets - one after the other in accordance with the sequence of the respective pole pieces and synchronized with the movement of the grooves in front of the respective section of the pole piece - to weaken the field of the permanent magnet, each pulse being one Duration which is equal to or shorter than the time which elapses between the passage of two adjacent grooves of the needle bed before the beginning of the relevant section of the pole piece;
  • the lower needle is in a direction towards the outside of the needle bed Recess arranged a second sub-needle, the latter only slides along and within the corresponding groove in the needle bed and does not swing; also the first end of the swinging sub-needle - suitable to interact with lifting cams - the lower one his; furthermore it can be between the swinging sub needle and the second sub-needle resilient element be a leaf spring, wherein one end is integrated into the second sub-needle and the other end is open the second end of the swinging lower needle rests and the leaf spring if possible stays inside the groove of the needle bed so that it doesn't accidentally comes into contact with objects near the needle bed.
  • the system according to the present invention is particularly suitable for Machines that work for the knitting patterns they can make, at least comprise a multi-selective needle selection point.
  • An example of one Such application relates to the execution of inlay patterns in which different needles selectively at two different levels of lifting must be raised: a lifting level to scrape the last one below the open needle tongue and a level with conservation the last stitch formed above the tongue.
  • a selection system is described, according to an embodiment of the present invention applied to a circular knitting machine, comprising a cylinder 1 (FIG. 1) with a vertical axis, which has a plurality of grooves 1A parallel to its own axis on its circumference.
  • a needle 3 In each of these grooves a needle 3, a vibrating sub-needle 5 and a second sub-needle 7 slide, which does not vibrate but only slides vertically; the vibrating sub-needle 5 is arranged in a recess 7A of the second sub-needle 7, in which the sub-needle 5 can swing about a pivot point 5B without longitudinal displacements.
  • the oscillating lower needle has a profile on the rear side for resting in the base of the recess 7A, the pivot point 5B being between the two ends, for a rotary movement of the oscillating lower needle between a first end position of the rotation in which the lower end of the oscillating lower needle coexists a lifting lug 5C protrudes from the cylinder so that it can engage in a lifting cam 9, and a second end position of the rotation (Fig. 4), in which the upper end of the vibrating lower needle protrudes from the cylinder with an extension 5D, which on the Pole shoes of an electromagnetic element 11, which in the following more precisely is described, comes to rest; these pole pieces are arranged in the vicinity of the outer surface of the cylinder 1.
  • the second sub-needle 7 has an edge 7C, which can interact with lowering cams such as 13, and a second recess 7D, in which a leaf spring 15 is fastened with rivets or otherwise.
  • This spring 15 rests with the free end on the upper end of the oscillating inner needle and presses it inwards, so that the oscillating inner needle tries to assume the first end position shown in FIG. 3, the lifting salt protruding from the groove 1A of the cylinder.
  • the selection system according to the invention also comprises an electromagnetic element 11 (see also FIGS. 5 and 6) which is attached to the frame of the machine in the vicinity of the cylinder 1.
  • the electromagnetic element comprises an outer envelope 11X, made of a non-magnetic material (such as aluminum or the like), in which a permanent magnet 11A, usually in the form of a parallelepiped, and pairs of pole pieces 11B, 11C, 11D, 11E and 11F, for example by gluing are attached.
  • the pole pieces lie near the outer surface of the cylinder and follow one another in the direction of rotation of the cylinder, being separated from one another in the vicinity of the cylinder by a small gap on the order of 0.2 mm.
  • the electromagnetic element further comprises six electromagnets with coils 11H, each mounted on one of the elements of the middle pole shoe pairs 11C, 11D and 11E, which are called middle pairs because they lie between the outer pairs 11B and 11F.
  • the outer pole shoe pairs 11B and 11F have an outer width that is a multiple of the pitch of the grooves of the cylinder, while the middle pairs 11C, 11D and 11E have an outer width that is equal to or less than the pitch of the grooves of the cylinder.
  • the two coils which are mounted on elements of the same pair of pole pieces, are connected to each other so that each pair of coils with the associated pole pieces behaves like a single electromagnet, in which a suitable current pulse in the area of its own pole piece essentially affects the magnetic field generated by the permanent magnet in the respective pole piece pair can weaken.
  • the needle cylinder 1 is rotated in a continuous movement in the direction of the arrow F1 (FIG.
  • the system changing cams in the order corresponding to the direction of rotation F1 includes, including the lowering cam 13, a radial cam 17 and a cam 9 for lifting.
  • the already mentioned cam 13 for lowering the lower needles 7 brings - by acting on the lowering edge 7C of the lower needle 7 - all lower needles 7 with the edge 7C to a level XX (FIG. 2) as much as possible, and with these brings the vibrating lower needles 5 with the associated lifting attachment 5C to a level X1-X1 (FIG. 2), likewise the greatest possible lowering.
  • the radial cam 17 has an inclined profile in the vicinity of the cylinder 1 in order to move the lower end of the vibrating lower needles 5 radially inward and thus to bring them into the second end position of the rotation.
  • the electromagnetic element 11 is mounted at a suitable height above it, which faces the extensions 5D of the vibrating lower needles; with the rotation of the cylinder, all vibrating lower needles 5, when they move in front of the radial cams 17, are rotated into the second end position of the rotation and, before they leave the sphere of action of the radial cam, bring their upper extension 5D wholly or almost with the pole pieces 11B of the electromagnetic element in contact.
  • the radial cam 17 ends before the oscillating lower needle 5 has moved with its upper extension 5D all the way over the pole pieces 11B, and the attraction exerted by the magnetic field of the permanent magnet on the extension 5D is sufficient to keep it on the pole piece even after the end of the hold radial cam by overcoming the elastic force of the spring 15.
  • the lifting cam 9 has a suitable rising flank which begins immediately after the last middle pole piece 11E in the direction of rotation of the cylinder (arrow F1).
  • the mode of operation of the selection device is as follows: With the rotation of the cylinder in the direction of arrow F1, all lower needles 7, 5 are lowered from the cam 13 to the deepest lowering level, either with the edge 7C to the level XX or with the lower edge of the projection 5C to the level X1-X1. All vibrating lower needles are then rotated by the radial cam 17 into the second position (FIG. 4), in which - even after the end of the cam 17 - they rest with the extension 5D on the pole pieces 11B (FIG. 5) from the magnetic field of the permanent magnet 11A. At this point there are two ways of working.
  • the selection system described is particularly suitable for use in a machine which requires selection with two levels of selective lifting; for example a lifting level for stripping the last stitch under the open tongue of the needle, such as the described lifting level of the cam 9, and a lifting level while maintaining the last stitch formed over the needle tongue; for this purpose, the cam 9 in the direction of rotation of the cylinder can be followed by a lifting cam 10 (FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP95117676A 1994-11-17 1995-11-09 Elektromagnetisches Nadelauswahlsystem für Strickmaschinen Expired - Lifetime EP0712952B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI000209 1994-11-17
ITFI940209A IT1269153B (it) 1994-11-17 1994-11-17 Sistema elettromagnetico di selezione degli aghi per macchine da maglieria

Publications (2)

Publication Number Publication Date
EP0712952A1 EP0712952A1 (de) 1996-05-22
EP0712952B1 true EP0712952B1 (de) 1999-04-28

Family

ID=11351023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117676A Expired - Lifetime EP0712952B1 (de) 1994-11-17 1995-11-09 Elektromagnetisches Nadelauswahlsystem für Strickmaschinen

Country Status (3)

Country Link
EP (1) EP0712952B1 (it)
DE (1) DE59505763D1 (it)
IT (1) IT1269153B (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH108358A (ja) * 1996-06-20 1998-01-13 Fukuhara Seiki Seisakusho:Kk 丸編機における編みツール制御装置
DE19822862C2 (de) 1998-05-22 2001-05-17 Sipra Patent Beteiligung Strickmaschinennadel und damit ausgerüstete Strickmaschine
DE19822861C2 (de) * 1998-05-22 2001-05-17 Sipra Patent Beteiligung Platine für eine Rundstrickmaschine und dafür geeignete Auswähleinrichtung
CZ304913B6 (cs) * 2004-05-18 2015-01-21 Fučíková Dagmar Zařízení pro volbu jehel
CN101435135B (zh) * 2007-11-14 2011-04-06 洪荣豪 圆编毛巾针织机的选针装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1585215A1 (de) 1965-03-06 1972-03-30 Morat Gmbh Franz Rundstrickmaschine,insbesondere Rundraenderstrickmaschine
US3972206A (en) * 1970-06-25 1976-08-03 VVU Zavodu vseobecneho strojirenstvi Pattern selector
US3851500A (en) 1971-04-19 1974-12-03 Rockwell International Corp Circular knitting machine needle selecting apparatus
DE2519896C3 (de) * 1975-05-03 1980-11-06 Mayer & Cie Gmbh & Co, 7470 Albstadt Elektrisch gesteuerte Nadelauswahlvorrichtung für Strickmaschinen
IT1198896B (it) * 1984-08-06 1988-12-21 Meritex Srl Macchina circolare da maglieria con sistemi di selezione elettromagnetici degli aghi
DE4028132C2 (de) * 1990-09-05 1994-06-30 Harting Elektronik Gmbh Auswahlmagnet

Also Published As

Publication number Publication date
DE59505763D1 (de) 1999-06-02
ITFI940209A1 (it) 1996-05-17
EP0712952A1 (de) 1996-05-22
IT1269153B (it) 1997-03-21
ITFI940209A0 (it) 1994-11-17

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