US3528266A - Draw mechanism for straight-bar knitting machines - Google Patents

Draw mechanism for straight-bar knitting machines Download PDF

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Publication number
US3528266A
US3528266A US733913A US3528266DA US3528266A US 3528266 A US3528266 A US 3528266A US 733913 A US733913 A US 733913A US 3528266D A US3528266D A US 3528266DA US 3528266 A US3528266 A US 3528266A
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cam
draw
bar
main
shaft
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US733913A
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English (en)
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Barry Frederick Swanwick
Ernest West
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MONK SUTTON IN ASHFIELD Ltd SA
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MONK SUTTON IN ASHFIELD Ltd SA
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B11/00—Straight-bar knitting machines with fixed needles

Definitions

  • the cross shaft and the draw cam continuously rotate and the draw lever thus continuously oscillates to reciprocate the main rack irrespective of whether machine is knitting or fashioning.
  • Means are included to transmit a drive from this rack to yarn carrier and slur cam drive systems. Between the rack and the said drive systems are provided automatically operable means to disconnect the drivetransmitting means from the rack, prior to fashioning, and to reestablish the connection between the drive-transmitting means and the rack upon resumption of knitting.
  • This invention appertains to a draw motion for a multihead straight-bar knitting machine of the Cottons patent or similar type for fully-fashioned outerwear manufacture.
  • the invention is concerned particularly with a draw motion of the kind in which a rotary draw cam, operating on trucks mounted on a pitman lever to cause to and fro movement of the latter, is used to effect, through the medium of the pitman lever, oscillatory movements of a swinging type main draw lever which is adapted to drive and reciprocate a main rack from which are in turn driven slur and yarn carrier drive systems.
  • the slut cams In a machine of the type concerned, the slut cams, one to each head or division, are mounted on slur cam boxes fastened to a slur rail which extends along the length of the machine.
  • the slur cams are driven across the sinker head through the medium of a tie bar in turn driven from the main rack through rack and pinion mechanism.
  • the said rail in the case of a machine fitted, as is primarily the intention, with a variable draw, is mounted on small levers to enable the said rail to have a rocking action to remove the slur cams from the rear of the sinker head during the knitting part of the loop forming cycle.
  • a straight-bar knitting machine to which the invention is applied may have a friction type of yarn carrier drive including rods, it is mainly the intention that it shall have a chain type carrier drive arranged to provide a controlled lead of the yarn carriers over the slur cams on virtually all knitting widths.
  • the invention accordingly has reference exclusively to a multi-head straight-bar knitting machine of the type specified including fashioning mechanism for shaping knitted fabric or garment blanks produced at the divisions as a consequence of widening or/ and narrowing by 100p transference to increase the number of wales, such increase or decrease being brought about by increasing or decreasing the number of operative needles at either or both selvedges without alteration to the character of the stitch.
  • a straight-bar knitting machine of the type referred to is provided with a continuously rotatable main cam shaft from and by which the various machine motions are respectively derived and controlled. From this main cam shaft is driven, usually through the medium of 2:1 bevel gearing, a cross shaft upon which is secured the aforementioned rotary draw cam.
  • the said cam shaft is adapted to be axially shifted bodily by a longitudinal shogging motion, from a normal position during which yarn sinking and knitting takes place to another position in which fashioning cams are introduced to the various motions for garment shaping and vice versa.
  • the mechanism employed for effecting these shogging motions is known as the cam shaft shogging motion and will be hereinafter described because it is used in the performance of the present invention.
  • the object of the present invention is to provide, in a multi-head straight-bar knitting machine, an improved draw motion of the kind herein referred to designed to obviate any necessity to disconnect, for fashioning, the drive from the continuously rotatable cam shaft to the cross shaft, thereby eliminating all shock loads between drive-transmitting components, whilst at the same time retaining conventional means for synchronising the direction and timing of the yarn carrier and slur draw drive systems.
  • the cross shaft and the draw cam of the improved draw motion continuously rotate and the main draw lever thus continuously oscillates to reciprocate the main rack irrespective of whether the machine is knitting or fashioning
  • means are provided between the continuously reciprocable main rack and the carrier and slur cam drive systems for automatically disconnecting the said systems from the main rack, prior to fashioning, and for re-establishing the connection of the systems to the main rack upon a resumption of knitting.
  • An important feature of the improved arrangement is 3 that the yarn carriers and the slur cams can be picked up upon a resumption of knitting from those side edges of the garment blanks at which they were deposited prior to fashioning irrespective of the direction of oscillation of the main draw lever.
  • the main rack constitutes one of two continuously and contrareciprocating bars arranged to be driven by or from the main draw lever, and automatically actuatable latch means are provided to effect a drive-transmitting connection between these two bars and a further reciprocable member from which the yarn carrier and slur cam drives are controlled during knitting operations.
  • the said latch means are essentially also appropriately operable to effect disconnection of the reciprocable member from the relevant one of the two contra-reciprocating bars prior to a fashioning operation.
  • these latch means may be arranged to be actuated by a cam on the continuously rotatable main cam shaft of the machine, through the medium of any suitable intermediate linkage, this cam being brought into co-operative relationship with the linkage each time the said cam shaft is shifted longitudinally by the cam shaft shogging motion for a fashioning operation.
  • the contra-reciprocating bars may be combined with opposed racks having interposed therebetween an idler pinion whereby the racks have imparted thereto identical but opposite traverses.
  • this may conveniently consist of a third rack bar which, in effect, takes the place of the main rack in regard to its relationship to the carrier and slur cam drives.
  • this third rack bar and hence also the carrier and slur drives may, by the simple automatic actuation of latches, be caused to remain quiescent whilst the cross shaft, the draw cam and the associated levers continue to operate.
  • FIG. 1 is a fragmentary plan view illustrating the existing drive-transmitting arrangement between the continuously rotatable main cam shaft and the cross shaft of such a variable draw motion, ie the conventional arrangement wherein the cross shaft and hence also the v rotary draw cam are stopped from rotating during fashioning,
  • FIG. 2 is a view similar to FIG. 1 depicting, by way of comparison, the improved drive-transmitting arrangement of the present invention wherein the drive from the main cam shaft to the cross shaft is never interrupted, thereby enabling the draw cam to rotate both when the main cam shaft is in the fashioning as well as in the knitting position, this figure also showing the cam shaft shogging motion common to the existing and the improved arrangements,
  • FIG. 3 is a general perspective view, from the front of the machine, of so much of the improved variable draw motion as is necessary to show the aforementioned two continuously and contra-reciprocating bars and the means by which they are driven from the main draw lever, and
  • FIG. 4 is another perspective view, also from the front, illustrating extensions of the said two continuously and contra-reciprocating bars, and the automatically actuable latch means whereby these bars are alternately connected to a third reciprocable bar from which the yarn carrier and slur cam drives are controlled during knitting cycles.
  • the cross shaft 13 and the draw cam 14 rotate only during knittingat which time the driving dog 16 is engaged in the slot in the female member 15.
  • the driving dog 16 is, in the existing arrangement, disengaged from the female member 15, as shown in FIG. 1, thereby allowing the cross shaft 13 and the draw cam 14 to be stationary, with the cam shaft 10 continuing to rotate.
  • the dog clutch is so designed and arranged that the driving dog 16, which does not in this case require to be spring-influenced, and the female member 15 are permanently engaged.
  • This results in the drive from the main cam shaft 10 to the cross shaft 13 never being disconnected. That is to say, even when the cam shaft 10 is shogged to the right by the shogging motion SM, for fashioning, the driving dog 16 will remain in the slot 15a in the female member 15, and the cross shaft 13, instead of being stopped as heretofore, will continue to rotate.
  • cam shaft shogging motion SM which is of quite conventional form and, as previously mentioned, common to both the existing and the improved arrangements shown in FIGS. 1 and 2 respectively.
  • a selection obtained from the fashioning frequency control unit results in the removal of a latch 17 from a position between a truck housing 18 and an enlarged portion 19a of a truck shaft 19 where it holds a shog truck 20 in the knitting position indicated in chain lines in FIG. 2.
  • the shog truck 20 With the retaining latch 17 removed, however, the shog truck 20 is moved forward to the full line position to be presented to a shog cam 21 under the action of a tension spring 22.
  • the shog truck 20 acts on the shog cam 21 to move the said cam shaft axially to the right from its normal knitting position to its fashioning position. By this shogging movement the fashioning cams are introduced to the various motions.
  • the illustrated variable draw motion is basically of the standard form wherein the thrust applied to a main draw lever 27 is supplied by the draw cam 14 which converts rotary motion of the main cam shaft 10 into the required lateral movement.
  • the said rotary draw cam 14 operates on and between two trucks 28 and 29 mounted on a pitman lever 30. The latter is caused, by the action of the cam and the trucks, to oscillate to and fro between a short draw lever 31 and a supporting lever 32 between the fixed throw of the pitman lever and the variable throw of the main draw lever 27.
  • the connection between the levers 27 and 31 is obtained by a connecting pin 33 which connects together two sliding die blocks operating respectively in the usual slot in the lever 31 and on the conventional lead screw (not shown) in the main draw lever 27.
  • the drive from the main draw lever 27 to the main rack 34 of the variable draw motion is through a pin 35 and an associated die block at 36 operating in a slot 37 cut in the top of the said draw lever 27.
  • the components of variable draw motion between the cam 14 and the main rack 34 are conventional and accordingly do not require any further description.
  • the illustrated draw motion differs from a conventional draw motion in that, in accordance with the present invention, there is arranged directly above the bar constituting the main rack 34 a second bar 38 provided with a toothed rack 39.
  • the two bars 34 and 38 are horizontally disposed and spaced apart parallel to one another.
  • An idler pinion 40 interposed between and arranged in mesh with the two opposed series of rack teeth 34a and 39a serves to drive the second bar from the main rack bar 34 so that the two have imparted to them identical but opposite traverses.
  • the two bars 34 and 38 can, therefore, be aptly described as two continuously and contra-reciprocating bars arranged to be driven respectively by and from the main draw lever 27.
  • a third horizontal and reciprocable bar 41 provided with a toothed rack 42, is mounted in front of the main rack bar 34.
  • a pinion 43 which is rigid with a turnable shaft 44 disposed parallel with respect to the cross shaft 13.
  • the arrangement is accordingly such that any traverse imparted to the third bar 41 in either direction from the continuously contra-reciprocating bars 34 and 38 by means presently to be described, will effect turning movements of the shaft 44.
  • the aforementioned idler pinion 40 is also mounted on, but is, of course, rotatable independently of, the shaft 44.
  • the conventional slur rail 49 upon which are mounted boxes such as 50 incorporating the slur cams, one of which is designated by the numeral 51, is adapted to be reciprocated from the slide bar 48 to drive the slur cams to and fro across the knitting width.
  • the slide bar 48 is fitted wtih a slur drive bolt 52 arranged to engage in a suitably dimensioned recess 53a in a drive component 53 attached to the slur rail 49.
  • the distance a slur cam lags behind the relevant yarn carrier is indicated at d in FIG. 3.
  • FIG. 4 Extensions of the two continuously and contra-reciprocating bars 34 and 38 are shown in FIG. 4 in which figure means for connecting these two bars alternately to the third reciprocable bar 41 from which, as already explained, the yarn carrier and slur cam drives are controlled during knitting cycles.
  • the said latch means comprise an upwardly directed spring-influenced latch 54 slidable vertically in a box 55 attached to the bar 34 (main rack), and a downwardly directed similar latch 56 slidably mounted in a like box 55 attached to the oppositely reciprocable bar 38.
  • the two latches 54 and 56 extend at right angles to the contra-reciprocating bars 34 and 38, the latch 54 on the lower bar 34 being spring-loaded in a vertically upward direction and that, 56, on the upper bar 38 being similarly spring-loaded but in a vertically downward direction.
  • a driving block 57 which is vertically slotted at 57a suchwise as to be capable of receiving either the latch 54 from below or the latch 56 from above. It will be noted that not only are the sides of the latches chamfered at the leading ends thereof, but also the upper and lower edges of the horizontal portion 57b of the driving block 57 are chamfered to facilitate engagement of a latch in the slot 57a.
  • a horizontal rod 58 which is carried between the forward ends of arms 59a of suitably spaced levers 59.
  • the rod 58 is for action upon small rollers R1 and R2 carried by the latches 54 and 56 re spectively.
  • the levers 59 are fulcrummed at 60 midway between their opposite ends in fixed brackets 61.
  • the forward ends of the arms 59b of the levers 59 are connected by a further horizontal rod 62 which is parallel to the rod 58 and is arranged to be acted upon by a suita'bly contoured edge cam 63.
  • This cam is adapted to be turned intermittently about the axis of a carrier shaft 64 which is mounted in upwardly directed extension arms 61a of the brackets 61.
  • the cam 63 has thereon four convex rises 63a spaced apart and four intervening concave depressions 63b.
  • roller R1 is always held up against the underside of the rod 58 under the action of the spring S1
  • roller R2 is at all times held down on to the upper side of the same rod under the action of the spring S2the two springs acting upwardly and downwardly respectively.
  • the cam 63 has combined with it at one side thereof a ratchet wheel 65, and for indexing this wheel to turn the said cam there is provided a spring-influenced pawl which is pivotally mounted at 66 upon a rockable lever 67.
  • the latter is connected, by a link 68, with one arm 69a of a two-armed lever 69 which is arranged to fulcrum about a fixed shaft 70.
  • the other arm 69b of the lever 69 is furnished with a cam follower 71.
  • the main cam shaft 10 has thereon a cam 72 which, whenever the said shaft is shogged to the right into the fashioning position by the cam shaft shogging motion SM is moved into line with the cam follower 71. Conversely, whenever the cam shaft 10 is shogged back leftwards into the knitting position, the cam 72 will be displaced out of line with the cam follower 71.
  • the latch 56 is permitted to move vertically downwards under the action of its spring S2 so as to be in a suitable position for engaging in the slot 57a.
  • the disengagement of the latch 54 from the driving block 57 disconnects the third bar 41 so that it remains quiescent and imparts no motion to the yarn carrier and slur cam drives during fashioning.
  • the draw cam 14 continues to rotate and the draw lever 27 proceeds with its traverse as fashioning takes place.
  • the upper reciprocating bar 38 will have traversed in the reverse direction until, at the completion of the fashioning course, the latch 56 engages downwardly in the slot 57a in the driving block 57 under the influence of the spring loading.
  • latch 56 Prior to the next fashioning course, latch 56 will be in engagement with the block 57, and so the purpose of the next operation of the linkage 67, 68 and 69 must be to effect disengagement of the latch 56 from the said block and to release the latch 54 for subsequent engagement in the slot in the block.
  • This is achieved as a consequence of the next indexing movement of the ratchet wheel 65 which causes the cam 63 to be turned through a further 45 from the position in which a cam depression 63b is opposed to the rod 62 to another position in which a rise 63a on the cam is in contact with the said rod.
  • the rod 62 is moved downwards and the rod 58 upwards so that the latch 56 will be moved up and withdrawn from the block 57 and the latch 54 permitted to move up so as to bein a position for engaging in the slot 57a.
  • a draw motion comprising, in combination, a cross shaft driven from said main cam shaft; a rotary draw cam on said cross shaft; a pitman lever having thereon spaced trucks between which the draw cam is located for action thereupon to move the pitman lever to and fro; a pivoted draw lever which is oscillated from the said pitman lever; a main rack which is connected to the draw lever and is thus reciprocated therefrom and drive-transmitting means between the said rack and the aforesaid yarn carrier and slur cam drive systems, wherein the improvement comprises the provision, between the reciprocable rack and the yarn carrier and slur cam drive systems, means automatically operable to disconnect the drive-transmitting means from the rack prior to fashioning and to
  • a draw motion according to claim 2, wherein the said automatically actuatable means consist of two latches which are respectively carried by and are traversible together with the two contra-reciprocable bars, each of these latches being adapted for engagement at an appropirate time in a driving component carried by the third reciprocable member and one of them being automatically withdrawn from, whilst the other is released for subsequent engagement in, the driving component, immediately prior to each fashioning operation, whereby during the latter the third reciprocable member remains quiescent.
  • latches are arranged to be actuated by a cam on the continuously rotatable main cam shaft of the machine through the medium of intermediate linkage, this cam being brought into co-operative relationship with the said linkage each time the cam shaft is shifted longitudinally by the cam shaft shogging motion for a fashioning operation and disengaged from the linkage whenever the said cam shaft is shogged in the opposite direction upon a resumption of knitting.
  • the intermediate linkage includes a horizontal rod which is arranged for permanent engagement with rollers on the latches this rod being movable up and down by operating means under the control of the cam on the main cam shaft, the arrangement being such that whether the rod is moved up or down, one of the latches will be withdrawn downwardly from a vertical slot in the aforementioned driving component carried by the third reciprocable memher while the other latch is released for subsequent upward engagement into this slot, or vice versa.
  • both of the contra-reciprocable bars are provided with rack teeth thereby providing opposed racks, and wherein there is interposed between and in mesh with said racks an idler pinion.
  • the third reciprocable member consists of a rack bar arranged in mesh with a pinion secured upon a shaft upon which are also mounted carrier drive sprockets and a slur drive 9 10 gear in mesh with a rack on a bar from which the slur 2,872,798 2/1959 Matthews et a1.
  • 66-126 XR cams derive their movements. 2,907,194 10/1959

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US733913A 1967-06-14 1968-06-03 Draw mechanism for straight-bar knitting machines Expired - Lifetime US3528266A (en)

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GB27405/67A GB1154967A (en) 1967-06-14 1967-06-14 Improved Draw Mechanism for Straight-Bar Knitting Machine

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US3528266A true US3528266A (en) 1970-09-15

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BE (1) BE716525A (forum.php)
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GB (1) GB1154967A (forum.php)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309091A (en) * 1940-04-13 1943-01-26 Julius Kayser & Co Carrier bar control mechanism
US2366340A (en) * 1938-03-26 1945-01-02 Lambach Fritz Method and machine for making hosiery
US2705879A (en) * 1954-02-23 1955-04-12 Boehringer Gmbh Geb Mechanism for driving the thread guide of a full-fashioned knitting machine
US2872798A (en) * 1955-12-19 1959-02-10 Monk Sutton In Ashfield Ltd Sa Draw mechanism for straight-bar knitting machines
US2907194A (en) * 1953-07-14 1959-10-06 Textile Machine Works Yarn carrier rod driving mechanism for knitting machines
US2912840A (en) * 1955-06-10 1959-11-17 Beautiful Bryans Inc Yarn carrier mechanism for flat knitting machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2366340A (en) * 1938-03-26 1945-01-02 Lambach Fritz Method and machine for making hosiery
US2309091A (en) * 1940-04-13 1943-01-26 Julius Kayser & Co Carrier bar control mechanism
US2907194A (en) * 1953-07-14 1959-10-06 Textile Machine Works Yarn carrier rod driving mechanism for knitting machines
US2705879A (en) * 1954-02-23 1955-04-12 Boehringer Gmbh Geb Mechanism for driving the thread guide of a full-fashioned knitting machine
US2912840A (en) * 1955-06-10 1959-11-17 Beautiful Bryans Inc Yarn carrier mechanism for flat knitting machines
US2872798A (en) * 1955-12-19 1959-02-10 Monk Sutton In Ashfield Ltd Sa Draw mechanism for straight-bar knitting machines

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BE716525A (forum.php) 1968-11-04
GB1154967A (en) 1969-06-11
FR1569283A (forum.php) 1969-05-30

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