EP0038437A1 - Single cylinder circular knitting machine of the type having two needle-carrying structures, for knitting plain and purl stitches - Google Patents

Single cylinder circular knitting machine of the type having two needle-carrying structures, for knitting plain and purl stitches Download PDF

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Publication number
EP0038437A1
EP0038437A1 EP81102380A EP81102380A EP0038437A1 EP 0038437 A1 EP0038437 A1 EP 0038437A1 EP 81102380 A EP81102380 A EP 81102380A EP 81102380 A EP81102380 A EP 81102380A EP 0038437 A1 EP0038437 A1 EP 0038437A1
Authority
EP
European Patent Office
Prior art keywords
needle
tricks
cylinder
needles
knitting machine
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Withdrawn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
EP81102380A
Other languages
German (de)
English (en)
French (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.)
COSTRUZIONI MECCANICHE LONATI SpA
Original Assignee
COSTRUZIONI MECCANICHE 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 COSTRUZIONI MECCANICHE LONATI SpA filed Critical COSTRUZIONI MECCANICHE LONATI SpA
Publication of EP0038437A1 publication Critical patent/EP0038437A1/en
Withdrawn legal-status Critical Current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
    • D04B15/18—Dials
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/06—Circular knitting machines with independently-movable needles with needle cylinder and dial for ribbed goods

Definitions

  • This invention relates to a single cylinder circular knitting machine of the type having two needle beds or needle-carrying structures, for knitting plain and. purl stitches.
  • Conventional knitting machines of this general type are known to have the plain-knitting needles movable vertically in needle tricks in the needle cylinder, the purl-knitting needles being movable radially in needle tricks formed in the needle dial overlying the cylinder.
  • the needle movements are executed through a control means at least in part driven of relative movement with respect to the two needle-carrying structures.
  • small diameter machines as employed mainly for hose knitting, the reduced size of the needle dial imposes, however, a reduction on the number of dial needles, which would otherwise end by interfering with one another at the area nearest to the dial center. Accordingly, small diameter knitting machines cannot be implemented for fineness above a certain value.
  • German Patent No. 667,499 proposes of making the dial with needle tricks of arcuate shape, according to a pattern which from a substantially radial direction at the outer edge of the dial is progressively deflected upwardly toward a substantially parallel direction to the machine centerline.
  • respective needles of arcuate shape which extend substantially through a 90 0 arc and are controlled by means of rockable jacks and respective horizontal sliders.
  • the arcuate arrangement of the needle tricks enables the provision in the dial of a greater number of needle tricks than in a conventional dial of the same diameter, since the tricks extend substantially remote from the machine central region. This affords the possibility of knitting fabrics of great fineness even with small machine diameters.
  • the arcuate dimension of the needle tricks increases the height dimension of the machine over machines equipped with conventional dials, while the needle control mechanism is complex and. bulky, and increases considerably the difficulty involved in supporting the rotary structure from above. Also, it is not possible to discharge the fabric in an upward direction.
  • That machine enables the knitted fabric to be discharged upwardly like in conventional double cylinder machines, and the arcuate configuration of the needle tricks allows the formation of an equal number of tricks in both needle-carrying structures, for the reason set forth hereinabove.
  • a machine of that type has an even greater height dimension, and involves of necessity provisions to support and actuate a more complex, heavy and massive upper rotary structure than a traditional needle dial.
  • This invention is directed to solve the technical problem of eliminating the aforementioned limitations and disadvantages of dial-equipped single cylinder knitting machines, by providing a single cylinder circular knitting machine having two needle beds or needle-carrying structures, wherein both needle beds or needle-carrying structures can have the same number of needles even with small machine diameters, which machine enables the knitted fabric to be discharged upwardly, that is ; in an inside-out condition, and comprises a particularly simplified form of support and actuation of the upper needle-carrying structure, with the space requirements of the latter being especially moderate.
  • a machine so constructed does away with the need for a conventional dial, and the upper needle-carrying structure is an integral part of the needle cylinder, it extending inside the latter and only minimally protruding above it.
  • the dial also missing are the supporting means and rotatively driving means therefor, since the upper needle-carrying structure is here supported and rotated through the needle cylinder.
  • the net result are a considerable simplification of the construction and reduction of the two needle-carrying structure height, as well as an appreciable reduction of costs.
  • cams supported on the inner portion of the cylinder may be used, such as not to increase the machine overall height beyond the level defined by the two needle-carrying structures.
  • the arcuate configuration of the upper needle-carrying structure enables the implementation, in the upper needle-carrying structure, of the same number of needle tricks as in the lower needle-carrying structure which comprises the needle cylinder, and consequently the production of a knitted fabric of high fineness even with small diameter machines.
  • the knitted fabric on its way from the stitch formation area toward an area located above the upper needle-carrying structure, is obliged to run externally to said structure, thereby it arranges itself in an inside-out condition. It may be advantageously discharged upwardly, while retaining its inside-out condition, by purposely arranging a conveying tube above the upper needle-carrying structure, wherethrough the knitted fabric may be either vacuum drawn or driven by other suitable means.
  • a circular knitting machine comprises two needle beds or needle-carrying structures, 1 and 2, arranged coaxially above each other.
  • the lower structure 1 comprises a needle cylinder 3, wherein there are formed, in a manner known per se, longitudinal needle tricks 4 accommodating movable latch needles 5, of conventional design, and underlying selecting jacks 6, also of conventional design. The latter can be selected through selecting devices, not shown, which may be in the form of traditional selection drums.
  • the needle cylinder 3 is carried rotatably by a stationary portion 7 of the machine main frame through bearings 8, and is rotatively driven, in a conventional manner, through a pair of bevel gear wheels 9,10. All around the cylinder 3, at the top portion thereof, there are arranged sinkers 11, of conventional design, which are.slidably received in a rotary supporting ring 12 and controlled by a fixed ring 1'3, the whole assembly being in accordance with well known conventional practices.
  • the reference numeral 14 designates a yarn feed unit comprising a plurality of yarn feeding fingers 15, e.g. as disclosed in Italian Utility Model. Application No. 21362 B/80 by this same Applicant.
  • the machine is also equipped with control means for the needles 5 and jacks 6, such means comprising conventional cams, not shown herein in any detail because known per se.
  • the upper needle-carrying structure 2 is arranged in the top inside portion of the cylinder 3 and is rigid therewith, it having needle tricks 16 of arcuate shape with their curvature center located on the same side as the cylinder 3. More specifically, the upper needle-1 carrying structure 2 includes an annular supporting body 17, substantially configured like the top portion of a wineglass and being carried on the cylinder 3 with the interposition of a substantially hollow cylindrical body 18 such that it is rigid for rotation with the cylinder 3 and no gaps are left between the supporting body 17 and cylinder 3. The supporting body 17 and cylindrical body 18 are so configured as not to interfere with the conventional path of movement of the sinkers 11.
  • the tricks 16, moreover, are slightly offset angularly with respect to the tricks 4 of the cylinder 3, thereby the needles 5 and 19 cannot interfere with each other in their movements.
  • a guiding body 20 the outer peripheral extension whereof matches the upper and internal peripheral extension of the supporting body 17, said guiding body having its top peripheral edge rounded off for guiding the fabric being knitted upwardly, as will be explained hereinafter.
  • the guiding body 20 and supporting body 17 have each a maximum diameter dimension, as measured respectively above the tricks 16 and at the tricks 16, which is slightly smaller than twice the bottom radius of the tricks 4 on the cylinder 3. ln other words, they cannot hinder the raising of the cylinder needles 5 and do leave a gap between them and the raised needles 5 (see right -hand needle 5 in Figure 1).
  • the needles 19 are each provided with a control butt 19a, and the guiding body 20 is configured to present cams 21,22'for controlling the needles 19. More specifically, the cams 21,22 define, in the guiding body 20, a passageway 23 for the butts 19a of the needles 19.
  • the cams 21,22 which may be construction-wise similar (excepting for their geometrical profile) to the cams which control the sinkers of a double cylinder machine, have a circumferential extension at the passageway 23 which causes the needles 19 to move along an arc of a circle between two limit positions, namely a yarn pick-up position whereat the hooks and latches of the needles 19 are moved out of the supporting body 17, as shown for the left-hand needle 19 in Figures 1 and 2, and a stitch forming position whereat the hooks and latches of the needles 19 fall within the peripheral contour of the supporting body 17, as shown for the righthand needle 19 in Figures 1 and 2.
  • the movement of the active or working ends of the needles 19 outwards of the supporting body 17 will occur in a substantially horizontal direction.
  • the cams 21,22 are arranged substantially inside the needle cylinder 3 and are carried by a non-pivotable tubular element 24 which extends throughout the cylinder 3 and protrudes out of the latter downwardly at the bevel gear pair 9,10 ( Figure 3).
  • a lever 25 which extends substantially radially to the cylinder 3 and is journalled with an intermediate point, as at 26, to the stationary portion 7 of the machine.
  • the other end of the lever 25 carries in an adjustable manner, such as by thread engagement, a pin 27, which is locked in place by a nut 28 and abuts against said stationary portion 7 by virtue of the weight of the tubular element 24.
  • a sleeve 29, attached externally to the tubular element 24, may facilitate the supporting of the cams 21,22.
  • the needle tricks 16 only extend radially for a short distance, at the top portion thereof, to progressively acquire a parallel lay to the machine axis of rotation.
  • the short radial extension of the tricks 16 enables the implementation, without any problems, of a number of needle tricks 16 equal to the number of needle tricks 4 on the needle cylinder 3, even with small machine diameters. This not only affords a considerable improvement in the machine fineness over a conventional machine of the same diameter, but also greater stitch variety capabilities, by virtue of the possible selection of the active or working needles of the upper needle-carrying structure among a larger number of needles.
  • the needles 5 and 19 are controlled to complete with their active ends substantially usual movements for a single cylinder knitting machine.
  • the knitwork 30, as it is being knitted is not brought toward the inside of-the machine, where no sufficient room is left between the two needle-carrying structures 1 and 2, but rather, thanks to the configuration of the upper needle-carrying structure 2 at the stitch formation area, conveyed outwardly and upwardly , initially around the outer edge of the guiding body 20, and then, being favored by its own tendency to shrink, toward the machine center, at an area overlying the upper needle-carrying structure 2.
  • mechanical or pneumatic auxiliary means for conveying the knitwork which are adapted to favor the initial phase of movement of the knitwork or fabric 30 along the outer surface of the top end of the guiding body 20.
  • a guiding tube 31 which is formed with a widening out bottom end and is arranged to leave a gap between the latter end and the top of the upper structure 2, in order to allow the knitwork 30 to pass therethrough.
  • the guiding tube 31 may be fixed or rotatable, and may be put in communication with a vacuum source in order to favor the stretching of the fabric and a regular forward movement thereof as it is being knitted. It is not strictly necessary that the tube 31 should extend over a height span equal to the length of the fabric being knitted, but may be substantially shorter, since the fabric or knitwork 30 is allowed to enter at once the vacuum duct connected to the guiding tube 31.
  • the guiding tube 31 there may be operated mechanical drawing means of the same type as employed in double cylinder machines. It should be noted that the knitwork 30 moves along the tube 31 in an inside-out condition.
  • the. needles 19' are butt-less and controlled by respective selecting jacks 32 which are slidable inside the cylinder 3' parallel to the axis thereof, in straight needle tricks 33 formed in the inside surface of a hollow cylindrical element 34, attached to the inside surface of the cylinder 3'.
  • the needles 19' are connected to the jacks 32 through a swivel type of connection, in particular a hooked connection, the needles 19' being provided with a bottom end 19'b bent outwardly to a hook, that is bent to form a hook on the concave side thereof, and the jacks 32 with a hooked top end-32a, ..facing inwardly.
  • the hooked ends 19'b and 32a are so designed as to enable the needles 19' to be either pulled and pushed by the jacks 32.
  • the jacks 32 are each provided with at least one butt 35 adapted to follow control cams 21',22' arranged within the cylinder 3' and being supported by the tubular element 24.
  • the circumferential extension of these cams substantially corresponds to that of the dial cams of an equivalent machine.
  • 36,37 there are indicated the two parts of the guiding body 20', the outer peripheral contour whereof, as viewed in section, follows the path of movement of the needles 19'.
  • the guiding body 20' is rigid with the tubular element 24.
  • the supporting body 17' is instead rigid with a hollow cylindrical body 18', the inside diameter whereof corresponds substantially to that of the cylinder 3'.
  • This embodiment of the invention has the advantage of a more simple construction of the cams controlling the needles in the upper needle-carrying structure.
  • the needles 19" are again butt-less and controlled by respective selecting jacks 32", which are vertically slidable in straight needle tricks 33" formed in the inside surface of the cylinder 3".
  • the connection between the needles 19" and respective jacks 32" is again of the swivel or articulated type, the needles 19" having a protruding hooked bottom end 19"b, and the jacks 32" having a bifurcated top end 32"a for push-pull engagement with the needles 19".
  • the jacks 32" are provided with a butt 35 each, said butt being operative to follow control cams 21", 22" located inside the cylinder 3" and being supported on the tubular element 24 with the interposition of a sleeve element 38.
  • the circumferential extension of the cams 21",22” is identical to that of the cams 21',22'.
  • the cylindrical body 18 which intervenes between the cylinder 3" and supporting body 17', is fitted onto the cylinder 3" and has here a shorter axial length, as due to the presence of the needle tricks 33".
  • This embodiment has the advantage of allowing the implementation of cams 21",22" with a more gentle slope, since the cams are arranged along a circumference extending farther from the machine axis than in the embodiment of Figure 4, actually along a circumference of slightly smaller diameter than the inside diameter .of the cylinder 3".
  • a machine according to the invention is much more simple and economical than a conventional needle cylinder and dial machine, it being destitute of any dial and respective supporting and actuating means, thanks to the two needle-carrying structures being arranged to form a single unit. It also allows the achievement of advantages which are typical of double cylinder knitting machines, without involving the complexity and cost of the latter.
  • the machine may be provided with a stationary needle cylinder and rotating cams.
  • a pin and slot system could be employed.
  • the top peripheral portion of the guiding body 20, respectively 20' could be arranged to rotate together with the knitted fabric.
  • the knitwork 30 could be drawn, after the initial phase, into the tubular element 24 (should the dimensions of the latter allow it) and be then discharged upwardly.
  • the tubular element 24 could also be closed at the center thereof to favor the drawing of the knitwork around the edge of the guiding body 20, respectively 20'.
  • the machine described hereinabove need not be provided of necessity with an equal number of needle tricks in both needle-carrying structures 1 and 2, and the upper structure 2 may include, for instance, tricks in one half the number of tricks in the lower structure 1.
  • the machine described may, of course, have a diameter of the same order of magnitude of conventional large diameter knitting machines,

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP81102380A 1980-04-18 1981-03-30 Single cylinder circular knitting machine of the type having two needle-carrying structures, for knitting plain and purl stitches Withdrawn EP0038437A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2150080 1980-04-18
IT21500/80A IT1141484B (it) 1980-04-18 1980-04-18 Macchina circolare per maglieria monocilindrica del tipo a due fronture o strutture porta-aghi,per la fabbricazione di maglia diritta e robescia

Publications (1)

Publication Number Publication Date
EP0038437A1 true EP0038437A1 (en) 1981-10-28

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ID=11182738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102380A Withdrawn EP0038437A1 (en) 1980-04-18 1981-03-30 Single cylinder circular knitting machine of the type having two needle-carrying structures, for knitting plain and purl stitches

Country Status (3)

Country Link
EP (1) EP0038437A1 (it)
JP (1) JPS56159329A (it)
IT (1) IT1141484B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326650A (en) * 1997-06-27 1998-12-30 Sipra Patent Beteiligung Lubricating dial of circular knitting-machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB109942A (en) * 1917-04-12 1917-10-04 Emil John Franck Improvements in or relating to Stocking Knitting Machines.
GB111402A (en) * 1917-02-28 1917-11-29 William Spiers Improvements in or relating to Circular Knitting Machines.
DE918287C (de) * 1952-02-03 1954-09-23 Willy Werner Lenkeit Handstrickapparat
DE2613179A1 (de) * 1976-03-27 1977-09-29 Hans Maisel Nadel- und nadelbettanordnung an flach- und rundstrickmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB111402A (en) * 1917-02-28 1917-11-29 William Spiers Improvements in or relating to Circular Knitting Machines.
GB109942A (en) * 1917-04-12 1917-10-04 Emil John Franck Improvements in or relating to Stocking Knitting Machines.
DE918287C (de) * 1952-02-03 1954-09-23 Willy Werner Lenkeit Handstrickapparat
DE2613179A1 (de) * 1976-03-27 1977-09-29 Hans Maisel Nadel- und nadelbettanordnung an flach- und rundstrickmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326650A (en) * 1997-06-27 1998-12-30 Sipra Patent Beteiligung Lubricating dial of circular knitting-machine
US6003343A (en) * 1997-06-27 1999-12-21 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Circular knitting machine with a dial lubricating device
SG84512A1 (en) * 1997-06-27 2001-11-20 Sipra Patent Beteiligung Circular knitting machine with a dial arrangement and a lubricating device
GB2326650B (en) * 1997-06-27 2002-03-06 Sipra Patent Beteiligung Circulating knitting machine with a dial arrangement and a lubricating device

Also Published As

Publication number Publication date
JPS56159329A (en) 1981-12-08
IT1141484B (it) 1986-10-01
IT8021500A0 (it) 1980-04-18

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Inventor name: LONATI, FRANCESCO