US3625028A - Method and means for effecting work take-off in flat bed and straight bar knitting machines - Google Patents

Method and means for effecting work take-off in flat bed and straight bar knitting machines Download PDF

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Publication number
US3625028A
US3625028A US880559A US3625028DA US3625028A US 3625028 A US3625028 A US 3625028A US 880559 A US880559 A US 880559A US 3625028D A US3625028D A US 3625028DA US 3625028 A US3625028 A US 3625028A
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United States
Prior art keywords
bar
hook
roller
fabric
workpiece
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Expired - Lifetime
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US880559A
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English (en)
Inventor
Frederick Raymond Challenger
John Harry Cuthbertson
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.)
MONK SUTTON IN ASHFIELD Ltd SA
Sa Monk Sutton-In-Ashfield Ltd
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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
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/88—Take-up or draw-off devices for knitting products
    • D04B15/90—Take-up or draw-off devices for knitting products for flat-bed knitting machines

Definitions

  • This invention relates to a method and means for effecting work take-off in V bed knitting machines of the single and multi-head type.
  • a known work take-ofi mechanism for this purpose comprises a hook-up bar which is adapted to engage the first course of knitting and initially to apply tension to the workpiece, a drawing-off roller and a pressure roller associated therewith for applying tension to the workpiece after it reaches a predetermined length, and pressoff means for disengaging the workpiece from the hookup bar when tension is taken over by the drawing-off roller.
  • a method of effecting work take-off in V bed knitting machines which comprises initially applying tension to a workpiece by means of a hook-up bar, subsequently applying tension to the workpiece by means of a drawing-off roller assembly, and finally disengaging the workpiece from the hook-up bar wherein, prior to the step of disengaging the workpiece from the hook-up bar, an auxiliary roller is caused to engage the workpiece at a position between the drawing-oif roller assembly and the hook-up bar.
  • a Work takeoff mechanism for V bed knitting machines comprises a hook-up bar arranged to engage and to apply tension to a workpiece, a drawing-off roller assembly for applying tension to the workpiece after it has reached a predetermined length, pres-off means for disengaging the workpiece from the hook-up bar when tension is taken up by the drawing-off roller assembly, and an auxiliary roller adapted to engage the workpiece at a position between the drawing-off roller assembly and the hook-up bar.
  • the drawing-off roller assembly comprises a stationary drawing-off roller and a tension roller which is movable into and out of an operative position adjacent the drawing-off roller.
  • the auxiliary roller is in the form of an idler roller which effects positive displacement of the knitted fabric issusing from the drawing-01f roller assembly.
  • FIG. 1 is a schematic elevation of a multi-head V bed knitting machine.
  • FIGS. 2a and b are perspective views of part of a V bed knitting machine showing one knitting head and those parts of a control division necessary to provide an understanding of the invention, and incorporating a take-off mechanism according to the invention,
  • FIGS. 3 to 5 are schematic side elevations showing the take-off assembly in different operative positions
  • FIG. 6 is a side elevation in the direction of the arrow X of FIG. 2, and
  • FIGS. 7 to 10 are sectional elevations showing different operational positions of a hook-up bar stop mechanism.
  • FIG. 1 of the drawings there is shown a multi-head V bed knitting machine comprising six knitting heads K and a central control division C.
  • FIG. 1 also shows, generally indicated at F, parts of the main supporting framework of the machine, some of which parts are also shown in the other figures of the drawings.
  • a pair of co-operating needle beds 1 each having a set of individually slidable needles 2 operated by cam boxes (not shown).
  • Operatively associated with the needle beds 1 are a plurality of yarn carriers 3.
  • the work table-off mechanism comprises generally a hook-up bar assembly 4, a drawing-off roller assembly 5, an auxiliary roller 6 and a press-off assembly 7.
  • the hook-up bar or hook-up bar assembly 4 comprises a tric-cut bar 8 having a series of hooks 9 which are spaced at a pitch similar to that of the needles 2 and are retained in position by a clamp bar 10.
  • the hook-up bar is supported at its ends on slide assemblies 11 which are braced by a tie bar 12, the connection between the bar and the slide assemblies being such as to permit of horizontal and vertical adjustment of the hook-up bar so that the hooks 9 will be presented in the correct position relative the needles 2.
  • the slide assemblies 11 are slidably mounted on vertically disposed guide rods 13 supported on the frame F and movement in a vertical direction is imparted to said assemblies by means of chain and sprocket assemblies 14.
  • Each chain and sprocket assembly 14 consists of a chain 15 which is attached at its ends to top and b0ttom lugs provided on the slide 11, the chain passing round an upper sprocket 16, idler sprockets 17, a drive sprocket 18 fixed to a driven shaft 19, and a lower tensioning sprocket 20.
  • the driven shaft 19 is rotated by a motor 21 which operates continuously whilst the machine is switched on.
  • the motor 21 is coupled, via gearing 22, to a lay shaft 23 which incorporates an electro-magnetic clutch 24.
  • the lay shaft 23 is further coupled, by gearing 25, to the driven shaft 19.
  • a magnetic particles clutch 26 is coupled, via gearing 27 to the lay shaft 23, and via gearing 28, to a second lay shaft 29.
  • the shaft 29 is coupled, via a dog clutch 30 and gearing 31, to the driven shaft 19, the dog clutch 30 being operated by a hydraulic ram 32 which is controlled from the main machine control unit, for example a punched tape mechanism.
  • a signal from the main machine control causes the electro-magneticclutch 24 to be energized whereby rotation of the driven shaft 19 is effected via the gearing 25.
  • the electro-magnetic clutch 24 is de-energised and the magnetic particle clutch 26 is energised.
  • the dog clutch 30 is engaged whereby rotation is imparted to the driven shaft 19 in a direction opposite to that previously described.
  • three spring loaded stop mechanisms 33 which serve to determine the extent of upward movement of the hook-up bar assembly 4 and, as hereinafter described, to effect tensioning of the first course of loops.
  • Each stop mechanism 33 comprises a lever 34 which is pivotally mounted on a Ushaped frame member 35, angular adjustment of said lever being provided by a setscrew 36.
  • the end of the lever 34 is provided with an adjustable stop 37, the latter receiving a plunger 38 which acts against a compression spring 39.
  • a projection 40 on one side of the lever 34 supports a pivotally mounted fork-like member 41.
  • a boss or cam 42 Fixedly mounted on the driven shaft 19 is a boss or cam 42 having secured thereto a stop block 43 which coacts with the stop 37 and the plunger 38, the stop block 43 being provided with a projecting pin 44 which acts with the fork-like member 41.
  • the stop block 43 When entering into engagement with the stop 37 it will be seen from FIG. that the stop block 43 also engages the plunger 38 against the action of the spring 39.
  • This provides an energy store so that, on changing over from the clutch 24 to the clutch 26 to reverse the direction of movement of the hook-up bar 4, the spring 39 provides an initial thrust in the reverse direction to apply tension to the first course of loops which, by this time, are engaged by the hooks 9 of the hook-up bar 4.
  • This action is facilitated by the provision of weights 45 attached to pulleys 46 fixed to the shaft 19 by means of cables 47, which weights serve to counterbalance the weight of the hook-up bar assembly 4.
  • the drawing-off roller assembly 5 comprises a drawingotf roller 48 and a pressure roller 49.
  • the roller 48 is mounted in fixed bearings in the framework F and is rotated by gearing 50 from the second lay shaft 29 from which downward movement is imparted to the hook-up bar via the shaft 19.
  • gearing 50 from the second lay shaft 29 from which downward movement is imparted to the hook-up bar via the shaft 19.
  • operation of the roller 48 is only required during a takedown operation and it will therefore remain stationary until the hook-up bar 4 commences to move in a downward direction.
  • the pressure roller 49 is mounted in spring-loaded housings 51 which are slidable in guide rails 52.
  • the housings 51 are coupled, via linkages 53, to an operating shaft 54 which is adapted, by the action of a hydraulic ram 55, to be angularly turned so as to move the pressure roller 49 towards and away from a position adjacent the drawing-oif roller 48.
  • the auxiliary roller 6 is mounted at its ends on hingedly supported brackets 56 which are biassed in an upward direction by means of spring biassed levers 57.
  • the ends of the levers 57 are connected to tension springs 58 which are anchored at 59 to the supporting frame F.
  • Adjustable set screws 61 are provided between the frame F and the levers 57 to adjust the angular position of the latter.
  • the press-0E assembly 7 comprises a press-01f plate 62 which extends the full width of the knitting head and projects into a gap provided between a knitted garment piece guide plate 63 and a work receiving tray 64.
  • the press-off plate 62 is pivotally mounted on brackets 65 secured to a supporting frame 66 and is fixed to one end of a lever arm 67.
  • a tension spring 68 is provided between the lever arm 67 and an anchorage point on the frame 66, the other end of the lever arm 67 being connected to an actuating rod 69.
  • a pivotally mounted roller lever 70 is mounted adjacent the base of one of the guide rods 13, a roller on one end of the lever 70 being positioned to be engaged by the correspondingly positioned slide 11 of the hook-up bar assembly 4, and the other end of the lever 70 being provided with a sleeve 71 which is slidably mounted on the lower end of the actuating rod 69.
  • a compression spring 72 is positioned on the rod 69 between the sleeve 71 and a stop collar 73.
  • the plate 62 merely deflects the fabric forward of the hooks 9, and when sufficient fabric is knitted, the weight of the fabric, plus the pressure applied by the plate 62, disengages it from the hooks 9' without difficulty.
  • the hookup bar assembly 4 In operation, in order to effect work take-off, the hookup bar assembly 4 is in its lowermost position, the pressure roller 49 is in its inoperative position as shown in FIGS. 3 and 4, the motor 21 is running with the clutches 24, 26 and 30 disengaged, the hook-up bar stop mechanism 33 is in the inoperative position shown in FIG. 7 and the press-off assembly 7 is in its retracted position.
  • various electrical interlocks well known in the art must, at this stage, be in their correct positions to ensure clear passage of the working parts. The most significant of these are switches 74 which indicate the angular position of the pressure roller actuating shaft 54.
  • the hooks 9 of the hook-up bar 4 are positioned between the two needle beds 1 and one of the yarn carriers 3 is operated to lay the yarn, which is usually a draw thread, for the first course.
  • the main machine control then calls for a work take-down operation.
  • release of the clutch 24 allows the plunger 38 under the action of the spring 39 to turn the shaft 19 sufficient to apply tension to the first course.
  • the hook-up bar 4 is moved downwardly in increments under the action of the clutch 26 and the dog clutch 30.
  • a cam 76 on one of the slides 11 trips a switch 77 which disengages the dog clutch 30 thereby completing controlled downward movement of the hookup bar 4.
  • the knitted fabric indicated at '78 in FIGS. 4 and extends in a taut condition directly between the needles 2 and the needles 9- of the hook-up bar 4.
  • Operation of the switch 77 also causes actuation of the hydraulic ram 55 to move the pressure roller 49 into its operative position as shown in FIG. 5.
  • Movement of the hook-up bar assembly 4 into its lowermost position also causes actuation of the roller lever 70 to operate the press-off plate 62 in the manner hereinbefore described.
  • the press-off plate 62 will not press-off the fabric whilst it is in a taut condition, and in fact, when the pressure roller 49 is moved into its operative position, it will be seen that the hook-up bar 4 will be lifted slightly to allow for the fabric to be Wrapped round the rollers.
  • the hook-up bar 4 will return to its lowermost position and subsequently that part of the knitted fabric extending between the rollers and the hook-up bar 4 will become slack.
  • the weight of the fabric, plus the action of the press-off plate 62 will cause disengagement of the fabric from the hooks 9.
  • the main machine control signals the yarn carriers to finish their movement at the end of their stroke, and also signals a press-off operation whereby the garment piece is released from the needles 2 in known manner.
  • the electrical circuit to the magnetic particle cuutch 26 is put through a time sequence which is operative to cause continued rotation, for a set period of time, of the drawing-off roller assembly 5 to release the fabric piece and allow it to drop into the receiving tray 64.
  • fashioning screws and nut housing of which are shown respectively at 79 and 80, means are provided for varying the tension applied to the fabric according to it knitting width.
  • variable ratio transformer 81 15 coupled, via gearing 82, to one of the nut housings 80 which control the knitting width of the fabric.
  • the transformer 81 is also connected electrically via line 83 to the magnetic particle clutch 26 which operates on the principle that, the greater the voltage applied thereto the greater will be the torque transmitted thereby.
  • the voltage applied to the clutch 26 is gradually reduced and thus the torque output thereof is lowered.
  • the fabric width is 6 increased, the voltage and thus also the torque output are increased.
  • Knitting continues with the hook-up bar 4 being moved downwardly in increments corresponding to one knitted course, the check pawls 86 serving to prevent the tensioned fabric from pulling the hook-up bar 4 back.
  • the press-off assembly 7 assists in detaching the fabric from the hooks 9 of the hook-up bar 4.
  • a method of effecting work take-off in a V bed knitting machine which comprises initially applying tension to a workpiece being knitted using a hook-up bar which is driven in a downward direction in increments corresponding to a knitted course, subsequently applying tension to the work-piece by means of a drawing-off roller assembly, and finally disengaging the workpiece from the hook-up bar wherein, prior to the step of disengaging the workpiece from the hook-up bar, auxiliary means are caused to grip the workpiece at a position between the drawing-off roller assembly and the hook-up bar so that, on release of the workpiece from the hook-up bar, said auxiliary means cause the knitted fabric issuing from the drawing-off roller assembly to follow a pre-determined path.
  • a work take-ofi mechanism for a V bed knitting machine comprising a hook-up bar having a series of fixed hook elements for engaging a fabric workpiece being knitted, traction means for moving said hook-up bar in a downward direction to apply tension to said workpiece and move the same along a predetermined path of travel, a drawing-off roller positioned adjacent said traction means, means for rotating said drawing-01f roller about its axis in the direction of workpiece movement, means mounting a pressure roller for movement from a first position remote from said drawing-off roller to a second position adjacent thereto, said pressure roller in said first position and said drawing-off roller being on opposite sides of said predetermined path of workpiece travel, means for moving said pressure roller across said predetermined path of workpiece travel from said first position to said second position whereby said workpiece is pressed into engagement with said drawing-off roller, and means for disengaging said workpiece from said hook-up bar after said workpiece has been gripped between said drawing-ofi" roller and said pressure roller.
  • the work take-off mechanism as defined in claim 4 including an idler auxiliary roller, and means supporting said auxiliary roller in spaced adjacent parallel relationship to said drawing-01f roller and on the same side of said predetermined path of workpiece travel whereby upon movement of said pressure roller to said second position said workpiece is also pressed into engagement with said auxiliary roller whereby said workpiece is constrained to pass between a nip of said drawing-01f roller and said pressure roller and between a nip of said pressure roller and said auxiliary roller.
  • said traction means includes means (1) for raising the hook-up bar into an operative position, (2) for lowering the hook-up bar in increments corresponding to a knitted course, and (3) for turning the drawing-off roller in increments corresponding to a knitted course.
  • said clutch mechanisms include a first clutch powered by a driven shaft to raise the hook-up bar into an operative position, a second clutch driven through a third clutch and said driven shaft to lower said hook-up bar, and said second clutch being further operative to rotate said drawing-off roller.
  • the work take-01f mechanism as defined in claim 7 including a device for applying tension to a first course of knitted loops of said workpiece immediately prior to the engagement of the workpiece by said hook-up bar hook elements.
  • the work take-off mechanism as defined in claim 7 including a fixed supporting frame for a knitting head, a plate extending lengthwise of said knitting head, a means mounting said plate for angular movement relative to said supporting frame at a position adjacent said hookup bar in the lowermost position thereof.
  • the work take-off mechanism as defined in claim 14 including spring means resisting the angular movement of said plate, and lever means between said plate and said hook-up bar and operative by the latter to effect angular movement of said plate.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US880559A 1968-12-06 1969-11-28 Method and means for effecting work take-off in flat bed and straight bar knitting machines Expired - Lifetime US3625028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB58061/68A GB1254540A (en) 1968-12-06 1968-12-06 Improved means for effecting work take-off in vee-bed knitting machines

Publications (1)

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US3625028A true US3625028A (en) 1971-12-07

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US880559A Expired - Lifetime US3625028A (en) 1968-12-06 1969-11-28 Method and means for effecting work take-off in flat bed and straight bar knitting machines

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US (1) US3625028A (fr)
CH (1) CH505240A (fr)
DE (1) DE1961223A1 (fr)
FR (1) FR2025553A1 (fr)
GB (1) GB1254540A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592214A (en) * 1983-08-29 1986-06-03 H. Stoll Gmbh & Co. Fabric draw-off roller on flat-bed knitting machines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58197357A (ja) * 1982-04-15 1983-11-17 株式会社島アイデア・センタ− 横編機の編出し装置
CH659269A5 (de) * 1982-08-04 1987-01-15 Stoll & Co H Warenabzugsvorrichtung einer flachstrickmaschine.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592214A (en) * 1983-08-29 1986-06-03 H. Stoll Gmbh & Co. Fabric draw-off roller on flat-bed knitting machines

Also Published As

Publication number Publication date
GB1254540A (en) 1971-11-24
DE1961223A1 (de) 1970-07-02
FR2025553A1 (fr) 1970-09-11
CH505240A (fr) 1971-03-31

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