US3916648A - Knitting machine cam system with pressing off means - Google Patents

Knitting machine cam system with pressing off means Download PDF

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Publication number
US3916648A
US3916648A US328381A US32838173A US3916648A US 3916648 A US3916648 A US 3916648A US 328381 A US328381 A US 328381A US 32838173 A US32838173 A US 32838173A US 3916648 A US3916648 A US 3916648A
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United States
Prior art keywords
cam
butts
needles
track
yarn
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Expired - Lifetime
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US328381A
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English (en)
Inventor
Max Williams Betts
Frank Robinson
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.)
Akzo Nobel UK PLC
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Courtaulds PLC
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Publication of US3916648A publication Critical patent/US3916648A/en
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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
    • D04B15/32—Cam systems or assemblies for operating knitting instruments
    • D04B15/36—Cam systems or assemblies for operating knitting instruments for flat-bed knitting machines
    • D04B15/362—Cam systems or assemblies for operating knitting instruments for flat-bed knitting machines with two needle beds in V-formation

Definitions

  • a cam track which allows butts to descend is provided subsequent to the raising cam but before the stitch cam, reckoned in the direction of relative movement of butts through the cam system, so that needles associated with butts which descend the track can be caused not to take yarn.
  • the cam system also includes means for selectively guiding butts along the track.
  • This invention relates to a cam system for shaping or fashioning panels in a flat knitting machine, the cam system being of the kind comprising a raising cam which brings needles up to clear their loops and subsequently take yarn for knitting, and a stitch cam, for lowering raised needles.
  • the invention aims to provide a cam system of this kind in which the raising cam is also used to bring the needles up to clear for pressing off loops.
  • a separate raising cam is used for this purpose but the presence of a separate raising cam increases the length of the cam box required to house the cam system. In a V-flat knitting machine this increases the time taken for the cam box to traverse the machine and thus reduces the rate at which fabric is produced.
  • Increase in the length of the cam box can also be a disadvantage in a circular knitting machine, particularly one with a reciprocating or contra-rotating cam box action.
  • the invention consists in a knitting machine cam system of the kind referred to, in which a cam track allowing butts to descend is provided subsequent to the raising cam but before the stitch cam in the direction of relative movement of butts through the cam system, whereby needles associated with butts which descend the said track can be caused not to take yarn, the cam system including means for selectively guiding butts along the said track.
  • Said last-named means may comprise, for example, selectively positionable jacks which can be positioned to contact a fixed lowering cam or to miss the lowering cam.
  • the means for guiding butts along the said track may comprise a further cam engageable with butts other than those which are to travel along the said track and located on the same elements as the first mentioned butts or on elements associated with the elements carrying the first mentioned butts, the said other butts being selectively raisable for engagement with the said cam.
  • the said means may alternatively comprise a further cam engageable with the butts which are to travel along the said track, when the butts are raised to a sufficient extent in relation to the needle bed, the machine including a device for selectively raising the said butts to that extent.
  • the said means may, as a further alternative, comprise a picker device adapted to contact a butt which is to travel along the said track or to contact a butt other than one which is to travel along the said track, the said other butt being located on the same element as the butt which is to travel along the said track or on a different element.
  • FIGS. 1, 2 and 3 are diagrams illustrating parts of three cam systems according to the invention.
  • FIG. 4 is a diagram illustrating the needle and jack for use in conjunction with the cam system of FIG. 1,
  • FIG. 5 is a section on the line VV of FIG. 2, and
  • FIG. 6 is a perspective view of the cam system shown in FIG. 2.
  • the cam system shown in FIG. 1 includes a raising cam 5 and a stitch cam 6 for cooperation with butts on needles of a knitting machine.
  • the normal basic construction of a cam system has been used in which the upper part of a raising cam is in one piece and the lower part, which serves to raise butts to tuck height, is in a separate unitary piece.
  • a groove is then milled in the block constituting the upper part of the raising cam and the edge of this groove appears at the top and bottom of the block.
  • the raising cam 5 raises the needles, in two stages, to a height at which they clear that is to a height at which a loop of yarn held in the hook moves down over the latch onto the shank of the needles below the latch.
  • a retracted jack butt 13 (dotted line showing of FIG. 4) would be too low to contact the cam 14 and would miss it, thereby failing to divert needle butt 10 down the track 8.
  • a liftedbutt 13 (full line showing of FIG. 4) would be high enough to contact cam 14 and would move along it, thereby diverting needle butt 10 down track 8.
  • the needle 9 would not have a butt 10 and the butt 13 of jack 1] would interact with the cams of FIG. 2.
  • a fully lifted butt 13 (full line showing of FIG. 4) would be high enough to contact the cam 23, thereby diverting itself down the track 22 and causing downward movement of the associated needle 9.
  • a fully retracted butt l3 (dotted line showing of FIG. 4).would miss the cam 23 and not be diverted.
  • a guard cam with a dwell portion 7 at a height suitable for holding needles while yarn is presented to their hooks.
  • a cam track 8 allowing needle butts by the raising cam 5 to descend before they reach the stitch cam 6, that is before they reach the cam portion 7 where the needle hooks take yarn.
  • Each needle 9 (FIG. 4) has a butt 10 for cooperation with the raising cam 5 and stitch cam 6 and with the cam track 8.
  • a further element constituted by a jack 11 joined to the needle by a linkage 12 allowing pivoting movement between the needle 9 and the jack 11.
  • Each jack 11 carries a butt 13.
  • the floor of the tricks in which the needles 9 and jacks 11 slide, is arranged, in known manner, to allow pivoting movement of the jacks between the position shown in broken lines in FIG. 4 and the lifted position shown in full lines in that Figure.
  • Known means such as an electro-magnetically operated jack controller (shown in FIG. 4) connected with the jack is incorporated in the knitting machine for effecting movement of the jack to whichever position is desired.
  • Such mechanisms are already incorporated in knitting machines to enable needles to be programmed to effect stitch transfer or to carry out other operations as required for patterning.
  • the cam system of FIG. 1 further includes a cam 14 for cooperation with the butts 13 of the jacks 11.
  • a butt 13 will engage the cam 14 only when the jack 11 on which it is carried is located in the position shown in full lines in FIG. 4.
  • the jack 11 will then be brought down, as the jack and its associated needle 9 move relative to the cam system so that the butt 10 of the associated needle 9 enters the track 8 and the needle descen'ds without taking yarn.
  • needles can be selected for casting off loops or for knitting.
  • cam box for a V-flat knitting machine using double system knitting further cams comprising a mirror image of those shown in FIG. 1 will be included to provide for casting off when the cam box traverses the needle beds in a direction such that the relative movement of the needles through the cam box is in the opposite direction to the arrow A, FIG. 1.
  • a single press-off track 8 will normally be sufficient, but a corresponding track for the opposite direction of cam box movement may be provided.
  • the cam system illustrated in FIGS. 2, 5 and 6 includes a two part raising cam 17, a stitch cam 18 and a guard cam with a dwell portion 19 where the needles take yarn for knitting. Subsequent to the raising cam 17 but before the stitch cam 18 in the direction of relative movement of the needles through the cam system (arrow B) is located a cam track 22 allowing butts to descend before they reach the stitch cam 18, that is before they take yarn for knitting.
  • a cam 23 is located adjacent the entry 24 to the cam track 22 and is of a height such that it will contact only lifted butts.
  • the needles and jacks used in conjunction with the cams of FIG. 2 are similar to those shown in FIG. 4 except that the needles 9 do not carry butts 10, the butts 13 of the jacks 11 serving to cooperate with the raising cam 17 and stitch cam 18 to effect the needle movements.
  • cam box for a V-bed knitting machine using double system knitting a cam system which is a mirror image of that shown in FIG. 2 will be included together with the cam system of FIG. 2 so that provision is made for pressing off in both directions of travel of the cam box.
  • the cam system shown in FIG. 3 comprises a two part raising cam 27, a stitch cam 28 and a guard cam with a dwell portion 29 where needles take yarn for knitting.
  • An escape track 30 is located subsequent to the raising cam 27 but before the stitch cam 28 in the direction of relative movement of the butts through the cam system (arrow C).
  • the butts directed into the cam track 30 bring the associated needles down to a level at which the loops on the needles are pressed off.
  • the descent of the needles, the butts associated with which enter the track 30, takes place before the needles have taken yarn to knit.
  • a needle and jack combination as shown in FIG. 4 is used in conjunction with the cam system of FIG. 3.
  • a selecting means for bringing about pivotal movement of the jacks 11 is not required to select needles to descend by the cam track 30 since another device, as described below, is provided for this purpose. Such selecting means may, however, be required to control other operations in the running of the knitting machine.
  • the butts 13 of the jacks ll cooperate with the raising cam 27 and the stitch cam 28 to cause the operating movements of the needles.
  • the butts 13 are directed into the track 30 by meansof a conventional picker device 33 which acts on the butts 10 of the needles 9. If the head 35 of the picker device '33 is set as shown in FIG.
  • the first needle butt 10 of a group of needles 9 will strike the surface 36 on the head and will be deflected downwards pushing down the associated needle 9 and jack 11 so that the butt 13- on the jack moves into the cam track 30.
  • the picker head 35 will be rotated about the axis 37 by the action of the needle butt 10 and will thereby be rendered inoperative so that the remaining needles of the group will pass through the cam system without being deflected downwards.
  • the picker head is reset by rotating it to the position shown in FIG. 3 once more; the picker device 33 includes conventional means for carrying out this operation when desired.
  • a cam box for a double system V-bed machine includes a cam system as shown in FIG. 3 together with its mirror-image.
  • butts may then be deflected down the escape track 22 or 30 to press off their loops.
  • the mechanism for positioning the jacks ll is capable of adjusting each jack to any one of three positions, then partly lifted butts can be arranged to engage the partly retracted upper part of the raising cam together with fully lifted butts whereas only fully lifted butts will engage the cam 23 and be deflected down the track 22 to press off.
  • each raising cam surrounding the entry portion of the escape track 8, 22 or 30 is recessed to reduce the risk of a butt being partly deflected into the entry so as to foul the edge of the track.
  • a cam system for a flat knitting machine having independently operable needles said cam system comprising a. a raising cam for contacting butts associated with needles of said machine to raise said butts and needles so that the needles clear yarn loops held thereon and take yarn for knitting,
  • directing means separate from said cam track for lowering selected needles raised to clearing height by said raising cam and routing the associated butts into said cam track.
  • said directing means comprises a further cam and a second group of butts different from the butts first referred to, each butt of said second group also being associated with a needle of the machine, said further cam being engageable with said second group of butts when the latter are lifted in relation to the needle bed.
  • a cam system for a flat knitting machine having independently operable needles located in at least one needle bed and means for supplying yarn to said needles, said cam system comprising:
  • a. structure defining a raising cam for contacting butts associated with the needles of said machine to raise said butts and needles to a height such that the needles clear yarn loops held thereon and take yarn from said supply means for knitting,
  • a cam track formed in said raising cam structure at a position in advance of that at which said raised needles take yarn in their movement through the cam system, said cam track providing a path for butts to descend without the associated needles taking yarn, and
  • directing means separate from said cam track for lowering selected needles raised to clearing height by said raising cam and for routing the associated butts into said cam track.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US328381A 1972-02-02 1973-01-31 Knitting machine cam system with pressing off means Expired - Lifetime US3916648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB499072A GB1411271A (en) 1972-02-02 1972-02-02 Knitting machine cams

Publications (1)

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US3916648A true US3916648A (en) 1975-11-04

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US328381A Expired - Lifetime US3916648A (en) 1972-02-02 1973-01-31 Knitting machine cam system with pressing off means

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US (1) US3916648A (ja)
JP (1) JPS5921985B2 (ja)
CH (1) CH561802A5 (ja)
DE (1) DE2304651A1 (ja)
FR (1) FR2170740A5 (ja)
GB (1) GB1411271A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100434584C (zh) * 2006-02-17 2008-11-19 奥华斯精密机械(深圳)有限公司 针织机三角导块模组
US11401638B2 (en) * 2018-05-22 2022-08-02 Fabdesigns, Inc. Method of knitting a warp structure on a flat knitting machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1475560A (en) * 1974-10-04 1977-06-01 Terrot Soehne & Co C Multifeed circular knitting machine
DD239012A1 (de) * 1985-07-01 1986-09-10 Textima Veb K Schlosssystem fuer strickmaschinen
JPS63116899A (ja) * 1986-11-05 1988-05-21 株式会社　寿 筆記具
JPS63221096A (ja) * 1987-03-10 1988-09-14 株式会社　寿 筆記具
JPH0620081U (ja) * 1992-03-27 1994-03-15 ぺんてる株式会社 筆記具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090597A (en) * 1932-07-18 1937-08-17 Hemphill Co Selective controlling means for knitting machines
US3108459A (en) * 1960-08-22 1963-10-29 Textile Machine Works Means for and method of operating circular knitting machines
US3148518A (en) * 1960-06-08 1964-09-15 Singer Co Multi-feed knitting machine
US3192742A (en) * 1962-05-08 1965-07-06 Carolina Knitting Machine Corp Stitch cam structure
US3340708A (en) * 1963-02-15 1967-09-12 Schieber Universal Maschf Knitting machine with electromagnetic needle selection mechanism
US3614877A (en) * 1969-03-14 1971-10-26 Monarch International Ltd Compound stitch cam for knitting machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4720290U (ja) * 1971-01-22 1972-11-07

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090597A (en) * 1932-07-18 1937-08-17 Hemphill Co Selective controlling means for knitting machines
US3148518A (en) * 1960-06-08 1964-09-15 Singer Co Multi-feed knitting machine
US3108459A (en) * 1960-08-22 1963-10-29 Textile Machine Works Means for and method of operating circular knitting machines
US3192742A (en) * 1962-05-08 1965-07-06 Carolina Knitting Machine Corp Stitch cam structure
US3340708A (en) * 1963-02-15 1967-09-12 Schieber Universal Maschf Knitting machine with electromagnetic needle selection mechanism
US3614877A (en) * 1969-03-14 1971-10-26 Monarch International Ltd Compound stitch cam for knitting machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100434584C (zh) * 2006-02-17 2008-11-19 奥华斯精密机械(深圳)有限公司 针织机三角导块模组
US11401638B2 (en) * 2018-05-22 2022-08-02 Fabdesigns, Inc. Method of knitting a warp structure on a flat knitting machine

Also Published As

Publication number Publication date
GB1411271A (en) 1975-10-22
JPS4885851A (ja) 1973-11-13
JPS5921985B2 (ja) 1984-05-23
FR2170740A5 (ja) 1973-09-14
DE2304651A1 (de) 1973-08-30
CH561802A5 (ja) 1975-05-15

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KR0137290Y1 (ko) 원형편물의 자카드기구