US3577749A - Circular knitting machines - Google Patents

Circular knitting machines Download PDF

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Publication number
US3577749A
US3577749A US745753A US3577749DA US3577749A US 3577749 A US3577749 A US 3577749A US 745753 A US745753 A US 745753A US 3577749D A US3577749D A US 3577749DA US 3577749 A US3577749 A US 3577749A
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United States
Prior art keywords
instruments
cam
raising
butts
selecting
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Expired - Lifetime
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US745753A
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English (en)
Inventor
Dennis Wright
Thomas Adams
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.)
BENTLEY MACH DEV CO
BENTLEY MACHINE DEVELOPMENT Co LTD
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BENTLEY MACH DEV CO
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Application filed by BENTLEY MACH DEV CO filed Critical BENTLEY MACH DEV CO
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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

Definitions

  • This invention is for improvements in or relating to circular knitting machines and is concerned more particularly with a procedure and mechanism for selecting needles for patterning.
  • circular knitting machines and particularly that class of machine used for knitting hose to provide as many yarn feeding stations as possible spaced apart around the needle circle, with a view to increasing the rate of productivity of the machine.
  • needle selecting mechanisms can be provided to operate at each feeding station, certain limitations of the patterning scope of the machine have to be tolerated. In other words, the increased output is only obtained at the expense of limiting the scope of the machine.
  • the problem encountered in seeking to provide patterning means at each feeding station of a multifeed circular machine arises from the difficulty of lack of space around the needle cylinder for accommodation of normal patterning means.
  • the patterning means in machines for knitting hose has to determine which needles are to knit and which needles are to pass a feeding station without knitting and consequently a selection of needles for knitting and for nonknitting is very desirable, if not necessary, to be provided for immediately before each knitting station.
  • the earliest point at which such a selection can be made is immediately after the cancellation of a previous selection and consequently space limitations have an acute influence on the possibility of providing adequately for a selection between two feeding stations.
  • the invention seeks to provide a procedure and means whereby cancellation of an old selection and making of a new selection can be carried out over a shorter circumferential distance of the needle cylinder than has heretofore been practicable.
  • the invention has reference to a known system of needle selection (hereinafter referred to as a system of the type specified) in which the division of needles into knitting and nonknitting streams is effected by means of an intermediate jack beneath each needle, a selecting instrument below each such jack, a cam system cooperating with said jacks and instruments and patterning means cooperating with selecting butts on the selecting instruments.
  • a system of the type specified a known system of needle selection in which the division of needles into knitting and nonknitting streams is effected by means of an intermediate jack beneath each needle, a selecting instrument below each such jack, a cam system cooperating with said jacks and instruments and patterning means cooperating with selecting butts on the selecting instruments.
  • the selecting instruments are each capable of rocking movement to cause a raising butt on the instrument to project from its trick into position to cooperate with a raising cam, and they are firstly all caused to project from their tricks (thereby cancelling any previous selection) and then by selective actuation some instruments have their raising butts left projecting to engage and ride up the raising cam while the raising butts of others which have been depressed into their tricks move behind the raising cam without being lifted.
  • the raising of selecting instruments acts through their jacks to raise their related needles into a knitting track while the needles related to instruments that are not raised follow a different (nonknitting) track. Subsequently the raised instruments are lowered by action of their jacks to join the level of those depressed into their tricks after which a subsequent selection can be made.
  • the resetting of the instruments which have remained at low level to cause them to project from their tricks is provided for by recessing or removing part of the raising cam at the level of the raising butt track of the selecting instruments remaining at low level (whose raising butts pass behind the cam), and also providing for a projecting cam to act on such low level instruments to rock them to move their raising butts out of their tricks at the recessed or cutaway part of the raising cam.
  • the invention comprises the provision in a circular knitting machine having a system of needle selection of the type specified of a raising cam associated with the selecting instruments and a projecting cam for acting on instruments at low level during the latter part of their passage behind the raising cam, and having the raising cam modified to permit the outward projection of the butts of the selecting instruments by the projecting cam.
  • the raising cam may be recessed or cut away behind it at its lower trailing part to accommodate projection of the raising butts of the lower selecting instruments so that as soon as the lower instruments emerge from behind the raising earn their butts are fully projected from the tricks. ln association with such provision selecting means is provided to cooperate with all of the selecting instruments immediately after they have passed the raising cam.
  • the modification of the raising cam referred to consists in the formation of a horizontal groove at the back trailing part of the raising cam, such groove being slanted, in depth so as to open on to the front (i.e. the outer) face of the cam immediately before the trailing end thereof.
  • the provisions according to the invention thus operate so that at a given selection immediately preceding which all selecting instruments are lowered and have their butts projecting from the tricks, predetermined ones of such butts are depressed into their tricks so as to pass behind a raising cam whilst those not so depressed rise up the raising cam and are subsequently caused to pass downwardly after passing the peak of the raising cam.
  • the modified mechanism is conveniently provided between each two successive feed points of a multifeed machine and it enables a difierent selection to be made at each feed point according to the set up of the patterning means related to each feed point in a machine having a relatively large number of feeding stations for a given cylinder diameter.
  • FIG. 1 is a developed view of some of the needle and jack operating cams of a single cylinder circular knitting machine for hosiery, as viewed from within the needle cylinder;
  • FIG. 2 is a sectional view taken on the line lI-ll of FIG. 1 and showing also a section through the cylinder wall, a needle, an intermediate jack and a pattern selector.
  • the cam box of the machine to which the drawings relate has an arrangement of cams by which circular knitting may take place at six feeding stations and a reverse knitting cam is included at one of the stations for reciprocatory knitting. Because the invention is not restricted to any specific cam box arrangement, it will not however be necessary to explain fully the function of all the cams shown. These include a number of bolt cams many of which are withdrawn when patterning is taking place and take no part in the knitting action.
  • FIG. 2 The disposition of the knitting elements can be seen in FIG. 2 in which the wall 1 of the needle cylinder is shown in section to expose one of the longitudinal slots or tricks 1a which house the knitting needles 2.
  • a sinker is shown at 5.
  • the knitting action is produced partly by cam action on the butts 2a of the needles and partly by cam action on either the intermediate jacks 3 or the instruments 4.
  • Stitches are drawn at stitch cams S1 and S6 and at any of the appropriately inserted stitch bolt cams, S2, S3, S4 and S5, which act on butts 2a of the needles. Stitches are cleared either by the needles being raised by their intermediate jacks 3 or by their selecting instruments 4 lifting the needles through the medium of their intermediate jacks.
  • needle clearing is obtained by any one of the butts 3a, 3b, 3c or 3d riding up an appropriately inserted bolt cam.
  • the four rows of butts, 3a, 3b, 3c and 3d are at different levels and cooperate respectively with bolt cams A,B,C and D at corresponding levels.
  • a variety of fabric constructions may be obtained such as a mock rib in which alternate needles knit and intermediate needles tuck, followed perhaps by a different basic construction for the leg.
  • the butts at one level and the corresponding bolt cams may be used for producing tuck patterns at certain feeding stations and butts at another level may be used for the insertion of rubber yarn.
  • the selecting instruments 4 are of a conventional type capable of rocking motion about a fulcrum point 4a. They are rocked outwards at their lower end by projecting cams C1 to C6.
  • the raising cams for the instruments 4 are shown at P1 and P6, and as each of the six selecting positions is identical, the following description will refer principally to one only of the positions, viz that of cam P2.
  • selector cams SC there is a bank of selector cams indicated at SC (one such bank being provided immediately in advance of each of the cams P1 to P6). According to the required pattern, certain of the selector cams SC will be displaced in towards the cylinder and others will be away from the cylinder.
  • the selecting butts 4b of certain of the instruments will be pressed by the cams so that their raising butts 4c will pass behind the raising cam P2.
  • the butts 4c of instruments which are not so pressed or rocked will ride up cam P2 and cause the related needles to clear the yarn below their latches prior to receiving yarn at stitch cam S2.
  • the needles of those instruments 4 not so raised will pass the stitch cam S2 at a low level and miss taking the yarn.
  • the butts 2a of the raised needles descend stitch cam S2 and in so doing return the raised jacks 3 and instruments 4 so that the butts 4c follow the dotted line 6 and eventually rejoin the low level path 7 (shown chain dotted) followed by the butts 4c of the unraised instruments.
  • cams P1 P2 etc. are angled at 8 to cam back projecting butts 4c when the needle cylinder is turning in the reverse direction.
  • Cams C1, C2 etc. are likewise provided with a reverse slope CS to permit the tails of the selectors 4 to run in the reverse direction without jamming against edge parts of such cams.
  • the invention is shown as applied to a single cylinder hosiery knitting machine having six feeding stations and reverse knitting cams, it is to be understood that this is by way of example only.
  • the invention could equally well be applied to other types of knitting machines including opposed coaxial needle cylinder machines, the purpose being to provide needle selection patterning means which occupies less space around the periphery of the needle cylinder than have previous patterning mechanisms.
  • a circular knitting machine comprising a needle cylinder equipped with needles slidable in tricks in said cylinder, rockable selecting instruments in the cylinder tricks and associated with the needles and having raising butts, selecting means to act on the instruments when projected from their tricks to cause particular ones of the instruments to be depressed into their tricks, cam means for raising and lowering instruments not so depressed including a raising cam having ascending and descending slopes and presenting on its inner face a recess at low level below its descending slope, said recess having an end opening into the lower end part of said descending slope and serving to accommodate outward movement of raising butts of depressed instruments not raised by the raising cam, a projecting cam aligned with said recess to project said depressed instruments from their tricks and cause their butts to enter and pass along and out of the said end of said recess in the raising cam, and further selecting means to act on the selecting instruments at the position at which selecting instrument butts emerge from the said end of the recess to join the track of other selecting instrument

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Knitting Of Fabric (AREA)
US745753A 1967-07-22 1968-07-18 Circular knitting machines Expired - Lifetime US3577749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33820/67A GB1177424A (en) 1967-07-22 1967-07-22 Improvements in or relating to Circular Knitting Machines.

Publications (1)

Publication Number Publication Date
US3577749A true US3577749A (en) 1971-05-04

Family

ID=10357881

Family Applications (1)

Application Number Title Priority Date Filing Date
US745753A Expired - Lifetime US3577749A (en) 1967-07-22 1968-07-18 Circular knitting machines

Country Status (6)

Country Link
US (1) US3577749A (en:Method)
BE (1) BE718278A (en:Method)
DE (1) DE1760912A1 (en:Method)
ES (1) ES356351A1 (en:Method)
FR (1) FR1575058A (en:Method)
GB (1) GB1177424A (en:Method)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726110A (en) * 1970-11-12 1973-04-10 Billi Spa Needle raising cams for circular knitting machines
US3791174A (en) * 1971-11-01 1974-02-12 Jumberca Sa Patterning mechanism for circular knitting machines
US3802224A (en) * 1970-06-09 1974-04-09 Mayer & Cie Maschinenfabrik Circular knitting machine with multiple knitting systems
US3910070A (en) * 1972-06-08 1975-10-07 Elitex Zavody Textilniho Apparatus for controlling the needle selectors in a circular knitting machine
US3916646A (en) * 1972-01-21 1975-11-04 Daito Seiki Electronic patterning process for a knitting machine
US4112712A (en) * 1976-07-21 1978-09-12 Macchine Tessili Circolari Matec S.P.A. Rocking jack safety device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1722989A (en) * 1926-03-19 1929-08-06 Camden Safe Deposit Trust Co Knitting machine
US3063269A (en) * 1959-08-01 1962-11-13 Sdruzeni Podniku Textilniho St Circular knitting machine having a patterning device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1722989A (en) * 1926-03-19 1929-08-06 Camden Safe Deposit Trust Co Knitting machine
US3063269A (en) * 1959-08-01 1962-11-13 Sdruzeni Podniku Textilniho St Circular knitting machine having a patterning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Belgian Printed Application No. 640,878, 1/64, Bertolini, 66/50. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802224A (en) * 1970-06-09 1974-04-09 Mayer & Cie Maschinenfabrik Circular knitting machine with multiple knitting systems
US3726110A (en) * 1970-11-12 1973-04-10 Billi Spa Needle raising cams for circular knitting machines
US3791174A (en) * 1971-11-01 1974-02-12 Jumberca Sa Patterning mechanism for circular knitting machines
US3916646A (en) * 1972-01-21 1975-11-04 Daito Seiki Electronic patterning process for a knitting machine
US3910070A (en) * 1972-06-08 1975-10-07 Elitex Zavody Textilniho Apparatus for controlling the needle selectors in a circular knitting machine
US4112712A (en) * 1976-07-21 1978-09-12 Macchine Tessili Circolari Matec S.P.A. Rocking jack safety device

Also Published As

Publication number Publication date
BE718278A (en:Method) 1968-12-31
FR1575058A (en:Method) 1969-07-18
DE1760912A1 (de) 1972-02-10
ES356351A1 (es) 1970-04-01
GB1177424A (en) 1970-01-14

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