US3908403A - Knitting machine - Google Patents

Knitting machine Download PDF

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Publication number
US3908403A
US3908403A US445863A US44586374A US3908403A US 3908403 A US3908403 A US 3908403A US 445863 A US445863 A US 445863A US 44586374 A US44586374 A US 44586374A US 3908403 A US3908403 A US 3908403A
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United States
Prior art keywords
selector
arm
knitting
slider
arms
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Expired - Lifetime
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US445863A
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English (en)
Inventor
Anthony S Ringrose
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Battelle Memorial Institute Inc
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Battelle Memorial Institute Inc
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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 ; 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

  • ABSTRACT A knitting machine having a knitting needle bed or drum rotatably driven and carrying a plurality of knitting needles circumferentially spaced thereon actuated to knitting positions by respective jacks, selector levers and moving means.
  • a selector system selectively selects individually which needles are to be disengaged from the moving means and disengages them individually trom the moving means so that when disengaged they remain inactive on the needle bed.
  • a slider reciprocably driven parallel to the axis of the needle bed by a sinusoidal cam on the needle bed mounts a plurality of selector arms that have their pivots on the slider reeiprocated to two terminal positions of the slider.
  • Two stationary abutments for each selector arm at one terminal position of the slider function as fulcrums for each selector arm at opposite ends thereof.
  • One of the abutments is an electromagnet.
  • the individual selector arms are attached or biased to the other stationary abutment by individual springs or permanent magnets.
  • the electromagnets are spaced from the pivots of the selector arms such that the selector arms have a greater lever arm length when fulcrumed on the corresponding electromagnet.
  • the individual electromagnets are energized in accordance with a predetermined program or desired pattern so that in dependence upon the energization of its corresponding electromagnct selector arm will either pivot on the other abutment or on the corresponding electromagnet as the slider moves to its opposite terminal position. If the corresponding electromagnet is energized the selector arm has a lever arm length effective to be in the path of a selector lever associated with a corresponding needle controlled by the selector arm to disengage it from the moving means so that the needle is rendered inactive.
  • the moving means has means that automatically cooperate with the selector lever to reengage the individual needles with the moving means after each disengagement.
  • KNITTING MACHINE BACKGROUND OF THE INVENTION This invention relates generally to knitting machines and more particularly to a knitting needle selector system therefore.
  • each jack is controlled by two opposing springs a selector spring and a cancelling or restoration spring
  • a stationary cam is disposed in the path of the selector spring to move the same on to a stationary electromagnet which releasably retains the spring selectively.
  • the spring unless retained by the electromagnet, is pressed centripetally by a second cam at a pressure greater than that of the restoration spring, so that the selector spring pushes the jack into the selection position.
  • This invention accordingly relates to a knitting machine having a frame carrying a moving support having a number of needles adapted to take up or assume two positions an operative position and an inoperative position a system for driving the support, means for individually moving the needles between their two positions, and a system for selecting such means.
  • the selector system comprises:
  • At least one moving selector arm having at one end a cam disposed near the support and adapted to act selectively on the needle-moving means
  • a slider which is substantially perpendicular to the selector arm and which is pivoted thereto and which is disposed between guides rigidly secured to the frame;
  • cam which has a substantially sinusoidal profile and which is solid in movement with the system for driving the support and with the slider to reciprocate the same between two positions, the cycle of such reciprocation corresponding to the consecutive passage past a fixed point of two needles controlled by the selector arm;
  • FIG. 1 is a fragmentary view, in a section line along a diameter of a selector system according to the invention
  • FIGS. 2 to 4 are diagrams showing three phases in the operation of a selector of the selector system of FIG. 1;
  • FIGS. 2a and 3a are detailed views showing variants of FIGS. 2 and 3 respectively.
  • FIG. 5 is a detailed view on the taken section line VV of FIG. 1.
  • a knitting machine comprises a needle bed I mounted in a frame 2 for rotation around a vertical axis (not shown).
  • the bed 1 is formed with a number of vertical tricks 3 in its outside lateral surface, only one of the tricks is visible in FIG. 1.
  • Three elements are retained by friction in trick 3 a selector lever 4 articulated at its bottom end in a semi-circular groove 5 at the base of trick 3, a jack 6 and a knitting needle 7.
  • the jack 6 is engaged at the bottom between jaws 8 and 9 of a resilient gripper manufactured together or integral with the top part of the lever 4.
  • the top end of thejack 6 has a semicircular head 6a which is engaged in a matching recess or socket in the base or bottom of the needle 7.
  • the jack 6 and the needle 7 have a butt 6b 7b respectively disposed opposite cams 10, 11 formed in the frame 2.
  • the lifting cam 10 controls needle ascent and the lowering cam 11 controls needle descent.
  • the selector lever 4 has a bent arm or elbow 4a forming a step engagable with a cam 12 rigidly secured to the frame 2.
  • the selector lever 4 also has a butt 4b disposed to project from trick 3 when the selector lever 4 pivots or tilts centrifugally.
  • a driven circular cam 13 is disposed in the thickness of an annular part la which projects radially around the needle bed bottom end.
  • That part of the slider 15 which is inside the casing 16 carries ten pins 17 which extend laterally of the slider longitudinal axis and to which ten selector arms 18 are pivotally connected in their central parts.
  • the arms 18 each terminate in a cam 18a at the end near the needle bed 1 and at their other ends are articulated to a soft-iron member 18b.
  • Two abutments 19, 20 are disposed axially spaced on the same side of each arm 18 and on either side of the slider 15 and are secured to the casing 16 in a position such that they are simultaneously in contact with their respective selector arm 18 when the slider 15 has been moved into its top position by cam 13 (FIG. 2).
  • a permanent magnet 21 is disposed beside each abutment 19 between the same and the slider 15.
  • the other abutment 20 is embodied by one of the pole faces of an electromagnet 22.
  • Each electromagnet 22 is connected, for energizing thereof, to a programmed control station PS synchronized with the angular position of the needle bed 1.
  • the soft-iron member 18b pivoted to the rear end of arm 18 remains in engagement with the pole face 20 since the attraction of the electromagnet is greater than the attraction of the permanent magnet 21; consequently, when the slider 15 descends the arm 18 moves into the position shown in FIG. 3 i.e., its cam 18a is in the path of the butt 4b of its respective selector lever 4.
  • the shape of the cam 18a which is shown in plan in FIG. 5, is such that the arm 18 pushes the selector lever butt 4b into the trick 3, so that the selector lever 4 pivots around its bottom end which is engaged in pivot groove 5.
  • the selector lever 4 moves the jack 6 towards the base of the trick 3 and causes the jack top end 611 to pivot in the recess or socket in the bottom of the needle 7.
  • This pivoting of the jack 6 causes its butt 6b to disengage from the lifting cam 10. With the jack 6 and the lifting cam 10 in this disengaged position, the jack 6 stays at the same level as shown in FIG. 1 so that the needle 7 is not lifted and does not knit,
  • the selector arm 18 experiences an oscillating motion whose end positions are shown in FIGS. 2 and 4, so that the selector arm 18a remains above the path of the butt 4b of its respective selector lever 4. The same therefore stays in the position determined by cam 12, and so the jack butt 6b stays engaged in the lifting cam 10 which lifts the needles 7 into the operative position, whereas cam 11 then returns the needles to the position shown in FIG. 1.
  • the ten selector arms 18 are rigidly secured to a common slider 15 but are required to cooperate with a system of ten needles disposed in ten consecutive tricks 3 of bed 1, the ten selector arm cams 18a of a single selector mechanism must be offset from one another by the amount of the angular separation between any two consecutive needles, as shown in FIG. 5.
  • FIGS. 2a and 3a show a variant for the selector arms 18, the permanent magnets 21 are replaced by springs 23 which develop a pull less than the attractive force of the electromagnet 22.
  • the springs 23 have exactly the same function as the permanent magnets 21 i.e., to maintain the selector arms 18 in engagement with the respective abutments 19 while the respective electromagnets 22 are not energized.
  • the selection mechanism described is very simple and reliable. It is a means of obviating return springs, which are always delicate items, for even when spring 23 are used they do not act as a return element.
  • the selector arm is rigid and is solid in movement with the needle bed 1 in both the selection and miss positions.
  • the electromagnet works only by attraction and so needs to provide only a relative reduced force.
  • the use of permanent magnets in this connection has advantages over using the springs 23, for in the case of a permanent magnet, when electromaget 22 retains the selector arm the attraction of the magnet 21 decreases in proportion as the selector arm moves away from the abutment 19 just the opposite of what occurs with the spring, so that the electromagnet 22 is required to develop a greater attractive force than when a permanent magnet is used. Since the spring is of use only when the selector arm 18 is required to remain in contact with the abutment 18, the extra pull developed by the spring in elongation is useless.
  • the selector mechanism operates advantageously without using any spring a great advantage which enables very high selection rates to be achieved, inter alia because of the kinetic connection between the selector arms 18 and the needle bed 1, which ensures thorough synchronization.
  • a rate of 100 selections/second/selector can be reached, and so the mechanism described with its ten selectors can provide 100 selections/second.
  • the selector mechanism described takes up little space and so can be provided in a large number around the needle bed.
  • each ten-selector facility takes up only an angle of 2 30 around a 76 cm diameter needle bed. Power consumption is very reduced, being something like 0.04 watt/element, and the heat dissipation from all the selector devices causes only a very slight increase in the ambient temperature around the machine.
  • This selector system is simple to adjust and service and cheap to manufacture.
  • the use of a sinusoidal cam is a means of reciprocating the slider in optimum conditions.
  • the amplitude or the slider movement can be small, the selectors amplifying such movement.
  • a knitting machine having a frame carrying a moving'support having a number of needles operable to two positions, an operative position and an inoperative position, a system for driving the support, means for individually moving the needle between their two positions,
  • selecting system comprises:
  • At least one moving selector arm having at one end a cam disposed near the support to act selectively on the needle-moving means
  • cam having a substantially sinusoidal profile and which is solid in movement with the system for driving the support and which is in engagement with the slider to reciprocate the same between two positions, the cycle of such reciprocation corresponding to the consecutive passage past a fixed point of two needles controlled by the selector arm;
  • a knitting machine characterized in that said moving support is a rotating needle bed, the slider, which is disposed parallel to the needlebed axis, carrying a number of other selector arms which are disposed radially of the bed and which are articulated at various respective levels, and respective cams carried by the selector arms angularly offset from one another by an angle equal to the gauge of the machine.
  • a knitting machine according to claim 1, charac- 6 terized in that it comprises means for applying a force greater than and opposite to the first of said two forces in the limit pivoting position of the arm retained against the other of the abutments by the second force, so as to retain said arm in said pivoting position in the event of the power supply of the machine is interrupted.
  • a selector system for selectively, selecting individually which needles are to be disengaged from said moving means and for disengaging the selected needles individually from said moving means so that the disengaged selected needles remain on said bed inactive, said selector system comprising a plurality of pivoted selector arms each disposed to cooperate with a knitting needle to disengage it from said moving means, reciprocable means reciprocable relative the knitting needle bed pivotally mounting said selector arms, a plurality of electromagnets each associated with a corresponding selector arm and spaced from the pivot thereof energized selectively in accordance with a desired pattern attracting one end of the associated selector arm upon travel of said reciprocating means away from said electromagnets to one
  • said selector system reciprocable means comprises a slider driven reciprocably parallel to the axis of rotation of said knitting needle bed by said rotatably driven knitting needle bed, means on said slider and means on said knitting needle bed for reciprocably driving said slider from said knitting needle bed, means on said slider pivotally mounting the selector arms disposed offset angularly of the knitting needle bed an angle equal to the gauge of the machine, means holding the selector arms in a releasable position for rocking upon attraction by the electromagnet thereof to said position effective for disengaging its corresponding knitting needle from the moving means.
  • each electromagnet comprises a stationary abutment for a corresponding selector arm, and a plurality of second stationary abutments on a same side of each said selector arm when said reciprocating means is at another terminal position thereof, and means attracting one end of the individual said selector arms to said second abutments for releasably holding each selector arm against said abutment when said reciprocable means is at said another terminal position thereof.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US445863A 1973-02-28 1974-02-26 Knitting machine Expired - Lifetime US3908403A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH289273A CH567130A5 (enrdf_load_stackoverflow) 1973-02-28 1973-02-28

Publications (1)

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US3908403A true US3908403A (en) 1975-09-30

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US445863A Expired - Lifetime US3908403A (en) 1973-02-28 1974-02-26 Knitting machine

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US (1) US3908403A (enrdf_load_stackoverflow)
CH (1) CH567130A5 (enrdf_load_stackoverflow)
DE (1) DE2409611A1 (enrdf_load_stackoverflow)
FR (1) FR2219264B1 (enrdf_load_stackoverflow)
GB (1) GB1451989A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790154A (en) * 1986-07-08 1988-12-13 Lonati S.P.A. Device for selecting needles in a circular knitting machine, in particular for stockings
US4838049A (en) * 1985-10-14 1989-06-13 Lonati S.P.A. Device for selecting the needles in a knitting machine, particularly for stockings
US5027619A (en) * 1988-10-05 1991-07-02 Wac Data Services Co. Ltd. Knitting needle driving mechanism of knitting machine
US5419162A (en) * 1994-01-25 1995-05-30 Matrix, S.R.L. High speed electromagnet selection device for selecting the needles in a knitting machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410115A (en) * 1966-05-31 1968-11-12 Singer Co Patterning apparatus for hosiery machines
US3530686A (en) * 1967-03-06 1970-09-29 Mayer & Cie Maschinenfabrik Pattern device for circular knitting machines having rotary needle carriers
US3667253A (en) * 1969-03-10 1972-06-06 Norbert Paul Bourgeois Needle selector for circular knitting machines
US3823579A (en) * 1969-08-16 1974-07-16 A Schindele Pattern control mechanism for circular knitting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410115A (en) * 1966-05-31 1968-11-12 Singer Co Patterning apparatus for hosiery machines
US3530686A (en) * 1967-03-06 1970-09-29 Mayer & Cie Maschinenfabrik Pattern device for circular knitting machines having rotary needle carriers
US3667253A (en) * 1969-03-10 1972-06-06 Norbert Paul Bourgeois Needle selector for circular knitting machines
US3823579A (en) * 1969-08-16 1974-07-16 A Schindele Pattern control mechanism for circular knitting machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838049A (en) * 1985-10-14 1989-06-13 Lonati S.P.A. Device for selecting the needles in a knitting machine, particularly for stockings
US4790154A (en) * 1986-07-08 1988-12-13 Lonati S.P.A. Device for selecting needles in a circular knitting machine, in particular for stockings
US5027619A (en) * 1988-10-05 1991-07-02 Wac Data Services Co. Ltd. Knitting needle driving mechanism of knitting machine
US5419162A (en) * 1994-01-25 1995-05-30 Matrix, S.R.L. High speed electromagnet selection device for selecting the needles in a knitting machine

Also Published As

Publication number Publication date
FR2219264B1 (enrdf_load_stackoverflow) 1977-11-18
CH567130A5 (enrdf_load_stackoverflow) 1975-09-30
GB1451989A (en) 1976-10-06
FR2219264A1 (enrdf_load_stackoverflow) 1974-09-20
DE2409611A1 (de) 1974-08-29

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