EP0351935B1 - Rundstrickmaschine zum Stricken eines Tuches - Google Patents

Rundstrickmaschine zum Stricken eines Tuches Download PDF

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Publication number
EP0351935B1
EP0351935B1 EP19890303711 EP89303711A EP0351935B1 EP 0351935 B1 EP0351935 B1 EP 0351935B1 EP 19890303711 EP19890303711 EP 19890303711 EP 89303711 A EP89303711 A EP 89303711A EP 0351935 B1 EP0351935 B1 EP 0351935B1
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EP
European Patent Office
Prior art keywords
needles
sinkers
stitch
sinker
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
EP19890303711
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English (en)
French (fr)
Other versions
EP0351935A3 (de
EP0351935A2 (de
Inventor
Shinji Kawase
Shyozo Yorisue
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Precision Fukuhara Works Ltd
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Precision Fukuhara Works Ltd
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Publication date
Application filed by Precision Fukuhara Works Ltd filed Critical Precision Fukuhara Works Ltd
Publication of EP0351935A2 publication Critical patent/EP0351935A2/de
Publication of EP0351935A3 publication Critical patent/EP0351935A3/de
Application granted granted Critical
Publication of EP0351935B1 publication Critical patent/EP0351935B1/de
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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
    • D04B15/06—Sinkers

Definitions

  • This invention relates generally to circular knitting machines wherein the vertical length of travel of the needles is reduced by lowering the stitch forming ledge of the sinkers as the needles are being raised to clearing level and raising the stitch forming ledge of the sinkers as the needles are being drawn downwardly to stitch looping level, and more particularly to a machine wherein the sinkers are supported for inward and outward movement between the needles along a downwardly inclined path of travel and with the sinkers being moved outwardly and upwardly as the needles are drawn downwardly to raise the level of the stitch drawing ledge during stitch loop formation and with the sinkers being moved inwardly and downwardly as the needles are raised so that the shed stitch loops are moved inwardly by the nebs of the sinkers.
  • the previously formed stitch loop in the hook of the knitting needle is moved downwardly along the needle shank and forces the latch of the knitting needle downwardly to the open position as the stitch loop is moved down the shank of the needle and while the needle is being raised to stitch loop clearing position in preparation for picking up a yarn in the hook thereof to form a new stitch loop.
  • the sinkers are normally supported for inward and outward sliding movement between the needles at a right angle to the knitting needles so that the sinkers move radially along a horizontal path of travel and the stitch drawing ledges of the sinkers are maintained at the same level during both the inward and outward movements.
  • the amount of vertical movement imparted to the needles by the knitting cams to form stitch loops is determined by the distance between the stitch drawing level of the needles and the clearing level to which the needles must be raised to clear the latches of the previously formed stitch loops as they are moved below the lower ends of the tips of the latches.
  • the amount of movement of the needles by the knitting cams can be determined by the addition of the distance between the stitch drawing ledges and the stitch drawing level to which the needles are drawn and the distance between the stitch drawing ledge and the level to which the needles must be raised to clear the previously formed stitch loops below the tips of the latches.
  • a 14 cut single jersey knitting machine generally requires a stitch forming movement of 2.5 mm, representing the distance from the stitch drawing ledge of the sinker to the stitch forming level of the hook of the needle.
  • the clearing height which includes the distance from the stitch drawing ledge to the clearing level of the hook of the raised needle, varies according to the length of the latch of the knitting needle.
  • the minimum required clearing height of the needle is 8.5 mm.
  • the total vertical stroke imparted to the needle by the knitting cams must be 2.5 mm plus 8.5 mm, or a total of 11.0 mm.
  • the angle of inclination of the knitting cams must be very steep, on the order of 55° or 56° in a knitting machine having four feeds per diametric inch. Many knitting feeds are provided in modern high production knitting machines so that the inclined angle of a cam to raise a knitting needle to clearing level and the inclined angle of a stitch cam to lower a knitting needle must be very steep.
  • Japanese Patent Publication SHO 62-8543 and U.S. Patent No. 4,532,781 disclose a sinker arrangement in which the sinkers are raised and lowered in cooperation with the vertical movement of the needles.
  • a portion of the length of the stitch loop is formed by raising the stitch drawing ledge of the sinker and the remaining length of the stitch loop is formed by the downward vertical movement of the needle so that the downward movement of the needle may be reduced by an amount which corresponds to the amount the stitch drawing ledge of the sinker is raised.
  • this arrangement requires the addition of long vertical sinker operating shafts extending downwardly into slots in the needle cylinder and requires the addition of appropriate cams for raising and lowering the sinkers.
  • U.S. Patent Nos. 3,837,185 and 3,986,371 disclose supporting the sinkers for movement along an upwardly inclined path of travel between the needles.
  • inward and upward movement is imparted to the sinker so that the horizontally disposed stitch drawing ledge of the sinker is raised as the needle is lowered to form stitch loops, thereby permitting a reduction in the vertical downward movement of the needle during the stitch forming process.
  • the sinker is further raised and moved inwardly as the needle is being raised to shed the previously formed stitch loop therefrom.
  • This upward and inward movement of the fabric by the sinkers while the needles are being raised tends to cause the fabric to be dislodged from the throat of the sinker beneath the neb and can cause a jam-up of the knitting needles.
  • U.S. Patent No. 4180993 describes another example of a circular knitting machine in which the stitch drawing ledge of the sinkers is raised and lowered by a rocking motion of the sinkers.
  • the sinkers are disposed in radial slots in a sinker support ring and are rocked back and forth under the action of a pair of camming surfaces on the underside of a cam member located above the support ring.
  • sinkers are supported on a rotatable sinker bed located exteriorly of the needle cylinder for movement in a radial direction and along a downwardly inclined path of travel between the needles.
  • a rotatable sinker bed located exteriorly of the needle cylinder for movement in a radial direction and along a downwardly inclined path of travel between the needles.
  • the needles As the needles approach the knitting station, they are raised to the clearing level while the sinkers are moved inwardly and downwardly so that the stitch drawing ledges are in a low position.
  • This lowering of the sinkers permits the needles to be raised to a lower than normal height and reduces the overall vertical movement which must be imparted to the needles.
  • Yarn is fed to the needles while in the raised clearing level and the needles are successively moved downwardly to draw the yarn downwardly therewith.
  • the sinkers are simultaneously moved in an outwardly and upwardly direction along the downwardly inclined path of travel while the needles are being lowered to move the stitch drawing ledge of the sinker upwardly in a vertical direction so that the stitch drawing ledge engages the yarn and cooperates with the associated adjacent needles to form stitch loops.
  • the length of the formed stitch loops is determined by the amount of upward vertical movement imparted to the stitch forming ledge of the sinker and the amount of vertical downward movement imparted to the needle.
  • the needle After forming the stitch loop, the needle is moved upwardly while the sinker is simultaneously moved in an inwardly and downwardly direction along the downwardly inclined path of travel so that the sinker neb engages the fabric and moves the same inwardly and downwardly to aid in shedding the previously formed stitch loop from the needle as it is raised with the newly formed stitch loop thereon.
  • the stitch forming ledge of the sinker is being raised in a vertical direction by withdrawing the sinker outwardly and upwardly so that a portion of the length of the stitch loop is determined by the vertical upward movement of the stitch forming ledge and a portion of the length of the stitch loop is determined by the amount of vertical downward movement imparted to the needle.
  • the sinkers are successively moved downwardly and inwardly so that the stitch forming ledge and the associated neb engages and moves the fabric downwardly and inwardly to aid in shedding the stitch loops from the needles as they are raised after the formation of the stitch loop.
  • the sinkers are supported for radial movement in a sinker bed fixed on and rotating with the needle cylinder while the needles are supported in the usual manner for vertical movement in slots in the needle cylinder and are controlled by knitting cams surrounding the needle cylinder.
  • Sinker cams are provided for engaging the operating butts of the sinkers to impart inward and outward movement thereto and along the downwardly inclined path of travel.
  • the angle of the downwardly inclined path of travel of the sinkers may be in the range of from 5° to 60°, preferably within the range of 10° to 45°, and is disclosed in the present application as being inclined downwardly at an angle of 20°.
  • the special type of sinker provided for use in accordance with the present invention includes an elongate body portion having a lower planar sliding edge.
  • An operating butt extends upwardly from an outer end portion of the elongate body portion and a planar stitch drawing ledge is provided on the inner end portion of the elongate body portion of the sinker.
  • a neb extends over the outer portion of the stitch drawing ledge and defines a throat between the neb and the outer portion of the stitch drawing ledge.
  • This special type of sinker is characterized by the stitch drawing ledge being slanted downwardly toward the operating butt on the outer portion of the elongate body portion.
  • the stitch drawing ledge extends along a line defining an acute angle with the junction of a line extending along the lower planar sliding edge of the sinker. Further, the juncture of the line extending along the stitch drawing ledge and the line extending along the lower planar sliding edge is located adjacent the outer end portion of the elongate body portion of the sinker.
  • a rotating needle cylinder 1 is supported on a driven ring gear 12 and the outside surface of the needle cylinder 1 is provided with the usual needle slots 1a in which hooked latch needles, broadly indicated at 2, are supported for vertical movement parallel to the axis of rotation of the needle cylinder 1.
  • Each knitting needle 2 is provided with an operating butt, as indicated at 2a ( Figure 1), a hook 2b, and a pivoted latch 2c ( Figure 3).
  • Conventional knitting cams, including stitch cam means supported on cam plates 4 are provided for imparting vertical movement to the knitting needles 2.
  • the cam plates 4 are supported on the inner surface of a cam holder ring 3 which is fixed on a cam ring plate 5.
  • a sinker nose support ring 6 is fixed on the upper inner surface of the needle cylinder 1 and is provided with a downwardly inclined surface 6a defined by the lower surfaces of sinker slots 6b provided in the upper end of the sinker nose support ring 6.
  • a sinker support bed 7 is fixed to the exterior of the upper end of the needle cylinder 1 and is provided with a downwardly inclined sinker sliding surface 7a defined by the lower ends of sinker slots formed in the sinker bed 7 and at the same downwardly inclined angle as the sinker sliding surface 6a of the sinker nose ring 6.
  • sinker cams 10 supported in a fixed position on a sinker cap 9.
  • Sinker cap 9 is in turn supported on a sinker cap ring 11 which is supported in spaced-apart locations on the upper ends of support standards 13 surrounding the needle cylinder 1.
  • the sinker cams 10 are supported in a downwardly inclined position at the same downwardly inclined angle as the inclined sliding surfaces 6a and 7a on the respective nose ring 6 and sinker bed 7.
  • the sinker sliding surfaces 6a and 7a are illustrated in Figure 1 as being downwardly inclined at an angle of 20° relative to a line perpendicular to the vertically disposed needles 2. While this 20° downwardly inclined angle is preferred, the present invention is not limited to this particular angular inclination but may be positioned at an angle of from 5° to 60°, and preferably within the range of 10° to 45°.
  • the special sinker 8 includes an elongate body portion having a main lower planar sliding edge 8e adapted to rest upon and slide along the inclined surface 7a of the sinker bed 7, and an inner lower additional planar sliding edge 8b adapted to rest on and slide along the inclined sliding surface 6a of the sinker nose ring 6.
  • a stitch drawing ledge 8a is provided on the upper inner portion of the sinker and a neb 8d extends over the outer portion of the stitch drawing ledge 8a and defines a sinker throat 8c between the neb 8d and the outer portion of the stitch drawing ledge 8a.
  • An upstanding operating butt 8f is provided on the outer end portion of the elongated body portion of the sinker 8. The butt 8f extends upwardly at a right angle from the body portion of the sinker 8 and is adapted to be engaged by the sinker cams 10 to impart the required inward and outward radial movement to the sinkers 8.
  • the stitch drawing ledge extends along a line which is parallel with the lower planar sliding edge of the sinker.
  • the present special type sinker is characterized by the stitch drawing ledge 8a being slanted downwardly toward the operating butt 8f on the outer end portion of the elongate body portion of sinker 8. As shown in Figure 2, the stitch drawing ledge 8a is slanted downwardly toward the operating butt 8f and along an angle represented by a dash-dot line 16 extending outwardly beyond the butt 8f and the outer end of the sinker 8.
  • a dash-dot line 17 represents the angle of the lower planar sliding edge 8e and joins the dash-dot line 16 at a juncture beyond the outer end of the sinker 8.
  • the juncture of the line 16 extending along the stitch drawing ledge 8a and the line 17 extending along the lower planar sliding edge 8e is located adjacent and beyond the outer end portion of the elongate body portion of the sinker 8.
  • the angle, indicated at a in Figure 2 between the lines 16 and 17 defines an acute angle of 20°.
  • the present sinker is also different from the special sinkers of the type disclosed in U.S. Patent Nos. 3,837,185 and 3,986,371 wherein the stitch drawing ledge slants downwardly or inwardly in the direction of the inner end of the sinker.
  • the solid line 50 indicates the path of travel of the top of the hook of the knitting needle 2 during a knitting cycle while the dash-dot line 52 indicates the path of travel of the stitch drawing ledge 8a of the sinker 8 during a knitting cycle.
  • the solid line 51 indicates the normal horizontal path of travel of conventional sinkers.
  • a yarn feed finger 54 positioned at one knitting station, is shown in position to feed a yarn 53 to the needles 2 as they are lowered to stitch forming level.
  • the needles 2 successively approach the knitting station they are successively raised to the clearing level along the solid line 50 in Figure 3 to a position where the previously formed loops surrounding the shank of the needle are lowered below the tip of the latch, as shown in Figure 4.
  • the sinkers 8 are moved inwardly and downwardly along the downwardly inclined path of travel 52 between the needles so that the fabric is moved inwardly by the neb 8d to maintain the previously formed stitch loop below the tip of the latch and in tight engagement with the shank of the needle, as shown in Figure 4.
  • the inward and downward movement of the sinker 8 lowers the position of the stitch drawing ledge 8a below the normal horizontal path of travel so that the needles 2 do not have to be raised as high to reach clear level as would be the case if the sinkers 8 were maintained at a higher level.
  • the sinker 8 begins to move inwardly and downwardly so that the previously formed stitch loop shed from the upper end of the hook of the needle 2 is engaged by the neb 8d and moved inwardly to aid in shedding the stitch loop from the needle.
  • This inward and downward movement of the sinkers 8 insures that the raising needles 2 do not again pass upwardly through the shed stitch loop.
  • the sinkers 8 continue to move the fabric inwardly and downwardly as the needle 2 continues to rise, as shown in Figure 12, so that the newly formed stitch loop is maintained in engagement with the outer surface of the needle shank and imparts a positive opening motion to the latches of the needles.
  • the sinker 8 With further vertical upward movement of the needles 2, the sinker 8 is maintained in the innermost and lowermost position while the formed stitch loop moves below the latch tip and is maintained on the outer surface of the needle shank by the sinker, as illustrated in Figure 4, to begin another knitting cycle.
  • This knitting cycle is repeated at each of the subsequent knitting stations around the needle cylinder to form the knit fabric.
  • the sinkers are supported around the outside of the upper end of the needle cylinder and are supported for movement in a radial direction along a downwardly inclined path of travel between the needles.
  • the stitch drawing ledge of the sinker moves outwardly and upwardly along the downwardly inclined path of travel of the sinkers and the needles are drawn downwardly while the stitch drawing ledge is maintained at its upper level so that the distance the needle must be lowered to stitch forming level is considerably reduced and the angle of inclination of the knitting cams can be reduced.
  • the stitch drawing ledges of the sinkers are moved to their innermost downward level so that the knitting needles do not need to be raised as high as they would normally be if the sinkers were moved in a horizontal path of travel. Therefore, it is not necessary to raise the knitting needles as high as would normally be required by the knitting cams to obtain the latch clearing level.
  • yarns have a tendency to break when the angle of the stitch forming cams is steep and a relatively weak yarn is being knit.
  • the yarn is fed to a smaller number of needles as they are being drawn downwardly toward stitch forming level.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Domestic Plumbing Installations (AREA)
  • Knitting Of Fabric (AREA)

Claims (3)

  1. Rundstrickmaschine umfassend eine Vielzahl von in einem sich drehenden Nadelzylinder (1) für eine vertrikale Bewegung parallel zu der Drehachse des Nadelzylinders (1) gelagerten Nadeln (1a), einer Strickkurvengetriebeeinrichtung (4), welche den Nadelzylinder (1) umgibt und betätigbar ist, um die Nadeln (1a) schrittweise auf eine freie Höhe anzuheben, um ein Garn (53) aufzunehmen und um dann die Nadeln auf eine Strickmaschen bildende Höhe abzusenken, Kulierplatinen (8) für eine Einwärts- und Auswärtsbewegung zwischen den Nadeln (1a) und eine Maschenzugleiste (8a) und eine Spitze (8d) auf dem inneren Endabschnitt jeder Kulierplatine (8) und die mit angrenzenden Nadeln (1a) bei der Bildung der Strickmaschenschleifen zusammenarbeiten, Einrichtungen zum Lagern der Kulierplatinen (8) für eine Bewegung in radialer Richtung und entlang eines abwärtsgeneigten Vorschubwegs zwischen den Nadeln, wobei die Kulierplatineneinrichtung einen drehbaren Ring (7) umfaßt, der außen auf dem Nadelzylinder (1) angeordnet ist, radialverlaufend ausgebildete Schlitze in dem Ring (7), um die Kulierpaltinen (8) aufzunehmen, dadurch gekennzeichnet, daß die Schlitze gleitend die Kulierplatinen (8) aufnehemen und lagern und abwärts und einwärts (7a) auf die Nadeln (1) zu geneigt sind.
  2. Rundstrickmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Schlitze unter einem Winkel innerhalb des Bereichs von 10 bis 60 nach unten und einwärts auf die Nadeln zu geneigt sind.
  3. Rundstrickmaschine nach Anspruch 2, dadurch gekennzeichnet, daß die Schlitze unter einem Winkel von 20° abwärts und auf die Nadel zu geneigt sind.
EP19890303711 1988-07-20 1989-04-14 Rundstrickmaschine zum Stricken eines Tuches Expired - Lifetime EP0351935B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18134688 1988-07-20
JP181346/88 1988-07-20

Publications (3)

Publication Number Publication Date
EP0351935A2 EP0351935A2 (de) 1990-01-24
EP0351935A3 EP0351935A3 (de) 1991-08-21
EP0351935B1 true EP0351935B1 (de) 1994-06-29

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ID=16099098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890303711 Expired - Lifetime EP0351935B1 (de) 1988-07-20 1989-04-14 Rundstrickmaschine zum Stricken eines Tuches

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EP (1) EP0351935B1 (de)
DE (1) DE68916487T2 (de)
ES (1) ES2058508T3 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2767273B2 (ja) * 1989-03-13 1998-06-18 株式会社福原精機製作所 プレーティングパイル編地の製造方法およびこれに使用するシンカー
JPH038840A (ja) * 1989-05-31 1991-01-16 Fukuhara Seiki Seisakusho:Kk 編地の製造方法およびこれに使用するダブルニット丸編機
EP0478855A1 (de) * 1990-10-04 1992-04-08 Precision Fukuhara Works, Ltd Verfahren zum Stricken von einem Stoff und Rundstrickmaschine zur Durchführung davon
CN100383305C (zh) * 2004-01-19 2008-04-23 佰龙机械厂股份有限公司 结构改进型圆编机
US7152436B2 (en) * 2004-01-20 2006-12-26 Pai Lung Machinery Mill Co., Ltd. Circular knitting machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986371A (en) * 1970-01-16 1976-10-19 Elitex, Zavody Textilniho Strojirenstvi Generalni Reditalstvi Method for forming loops in circular knitting machines
US4180993A (en) * 1976-11-01 1980-01-01 Morris Philip Sinker-needle motion reducer
DE3108041C2 (de) * 1981-03-03 1985-01-31 Alfred 7031 Bondorf Buck Strickmaschine

Also Published As

Publication number Publication date
ES2058508T3 (es) 1994-11-01
DE68916487D1 (de) 1994-08-04
DE68916487T2 (de) 1995-01-26
EP0351935A3 (de) 1991-08-21
EP0351935A2 (de) 1990-01-24

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