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US3623342A - Straight bar knitting machines - Google Patents

Straight bar knitting machines Download PDF

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Publication number
US3623342A
US3623342A US8170A US3623342DA US3623342A US 3623342 A US3623342 A US 3623342A US 8170 A US8170 A US 8170A US 3623342D A US3623342D A US 3623342DA US 3623342 A US3623342 A US 3623342A
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United States
Prior art keywords
draw
lever
cam
main
additional
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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
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US8170A
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English (en)
Inventor
Raymond Blood
Norman-Henry Small
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William Cotton Ltd
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William Cotton Ltd
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Filing date
Publication date
Application filed by William Cotton Ltd filed Critical William Cotton Ltd
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Publication of US3623342A publication Critical patent/US3623342A/en
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B11/00—Straight-bar knitting machines with fixed needles

Definitions

  • 66-126 8 Claims ABSTRACT GF THE DISCLOSURE Straight bar knitting machine draw mechanism in which a main draw mechanism with a smaller than usual draw cam and including an auxiliary draw lever adjustable through connections to selvedge stop adjustable lead screw mechanism, is connected to a thread carrier drive bar, and an additional draw mechanism comprises an additional draw cam drive with the main draw cam, a cam follower lever, and means connecting the latter to an additional draw lever which is pivotally mounted on the main draw lever, and wherein the additional draw lever is connected to a slurcam drive bar, so that acceleration and deceleration of the thread carriers and slurcocks are governed by respective draw cams of a composite draw mechanism.
  • This invention is for improvements in or relating to straight bar knitting machines and concerns variable draw mechanism therefor of the type comprising a draw cam, a cam follower lever operable by the draw cam, and draw lever means connected to the cam follower and to the slur bar for reciprocating the slurcams.
  • This type of draw mechanism is usually adapted for also reciprocating thread carriers through the intermediary of a drive bar and frictional connections, the traverse of the thread carriers being limited by selvedge stop adjusting mechanism for fashioning while the drive bar continues its traverse until it is returned with the slur bar by the draw cam.
  • the amplitude of movement of the draw lever means is adjustable by means of a lead screw and screw nut device associated with the draw lever means and which is adjusted in synchronism with adjustment of the selvedge stops. Con- .stant lead of thread carriers over slurcocks is automatically obtained. since after the thread carriers have been stopped and the drive bar has continued on, the return of the drive bar immediately carries the thread carrier with it to immediately traverse the thread carriers, whereas since the slurcams have travelled beyond the selvedges, there is a little delay during their return before they act on the selvedge sinkers.
  • An object of the invention is to provide draw mechanism of the type referred to of such improved construction as to avoid said undesirable consequences.
  • the invention provides, in a straight bar knitting machine, draw mechanism comprising a first draw mechanism including a first draw cam and connected to at least one Patented Nov. 30, 1971 thread carrier, at second draw mechanism including a second draw cam and connected to at least one slurcam, and means operably interconnecting the first and second draw mechanisms to provide for required acceleration and deceleration of the thread carrier and slurcam to be obtained from the first draw cam and the second draw cam respectively.
  • the first draw mechanism includes a main draw cam, main draw lever means operable by the main draw cam, means for connecting the main draw lever means, including frictionally, to thread carriers, and means for variably adjusting the main draw lever means under control of selvedge stop adjusting means for controlling stopping of the thread carriers
  • the second draw mechanism includes an additional draw cam and an additonal draw lever connected to the main draw cam and a main draw lever respectively, and means for connecting the additional draw lever to slurcams.
  • the draw mechanism may have the additional draw lever connected pivotally to the main draw lever and the additional draw cam rotatable with the main draw cam and adapted for imparting to the additional draw lever and the slurcams a greater amplitude of movement than the main draw lever and the thread carriers.
  • the draw mechanism may also have the additional draw cam adapted for the slurcams to be traversed thereby with different amplitudes of traverse to suit different adjustments of the selvedge stop adjusting means respectively, and the main draw cam adapted for the thread carrier drive bar to be traversed with amplitudes less than said different amplitudes respectively.
  • the main draw lever means comprises a main draw lever connected to the thread carriers and an auxiliary draw lever connected by adjusting screw and screw nut means to the main draw lever, and having motion transmitting means connected between said adjusting screw and said selvedge stop adjusting means.
  • the connection between the screw and screw nut means of the auxiliary draw lever and the main draw lever is by slide mechanism.
  • first drive bar to which the main draw lever and the thread carriers are connected
  • second drive bar to which the additional draw lever and the slurcams are connected.
  • main draw cam is of substantially conventional form and the additional cam is of substantially concentric form with rises and falls.
  • thread carriers are connected to the drive bar by frictional connection means.
  • FIG. 1 is an elevational view of variable draw mechanism according to the invention in a straight bar knitting machine.
  • FIG. 2 is a diagrammatic illustration of the draw mechanism.
  • FIG. 3 is a graph illustrating traverse of slurcocks and thread carriers with acceleration and deceleration characteristics.
  • FIG. 4 is an enlarged elevational view of the draw mechanism.
  • FIG. 5 is a cross sectional view of part of the machine showing a draw cam shaft and associated mechanism.
  • FIG. 6 is a cross sectional view of the machine showing main and additional draw levers of the draw mechanism.
  • FIG. 7 is a cross sectional view of the machine showing an adjustable lever of the draw mechanism.
  • FIG. 8 is a cross sectional view of the machine showing adjustable thread carrier selection means in the machine.
  • variable draw mechanism has a substantially eccentric main draw cam, in-
  • the lower end of the lever 7 is connected by a link 10 to the lower end of a variable draw lever 11 pivoted at 12.
  • This variable draw lever embodies a lead screw 13 and a screw nut 14, the lead screw 13 being adjustable by control means in synchronism with adjustment of selvedge stops to move the screw nut along the lever.
  • the selvedge stops are indicated at S1, S2 in FIG, 1 and they are mounted on oppositely threaded lead screws L1, L2 which are connected together and are racked round in known manner by known means for adjustment of the selvedge stops for the known purpose of adjusting the amplitude of travel of thread carriers.
  • one thread carrier bar T1 is secured to the selvedge stop S1 and a second thread carrier bar T2 is secured to the selvedge stop S2.
  • Thread carriers such as TC are mounted by any suitable friction means on a carrier rod CR which is reciprocated, by draw mechanism to be hereinafter described, to carry the thread carrier along the needle bar NB, the arrangement being such that the traverse of the carrier rod is with a maximum constant amplitude of movement and the traverse of the thread carrier TC by the carrier rod CR is adjustably limited by the adjustment of the stops STl, 8T2 as allowed by the frictional connection between the thread carrier TC and the carrier rod CR.
  • the said screw nut 14, FIGS. 1 and 4 is slidable along a vertical guideway 15a in a member 15 which is horizontally displaceable by being attached to horizontal bars 16, 17 which are horizontally slidable in guide brackets 18 to 21.
  • the member 15 is connected by link 22 to a main draw lever 23 which is pivoted at 24 and is connected by a slipper 25 to a driving bar 25a for traverse of thread carriers such as TC FIG. 1 through the intermediary of a selection mechanism SM of known fabric and which is operable in known manner to selectively couple the driving bar 25a to any one of a plurality of thread carrier rods such as CR.
  • Additional draw mechanism comprising an additional cam 26, FIGS. 1, 2, 4 on the cam shaft 2, cam follower rollers 27, 27a on levers 28, 28a which are interconnected by a link 28b and are operable by the cam, and a link 29 connecting the lever 28a to an additional draw lever 30.
  • the addtional cam 26 is basically eccentric and has opposed rise and fall portions 26a, 26b which are disposed to act on the cam follower roller 27 when the main draw cam is approaching its two limits of cam motions respectively.
  • the additional draw lever 30 is pivotally connected to the main draw lever 23 at 31, and its upper end is connected through a releasable catch device 30:: to the slur bar SB FIG. 1 to which the slur cams SC are secured.
  • the additional draw lever 30 Since the additional draw lever 30 is pivotally connected to the main draw lever 23 it not only moves with it by the main draw cant I but it is subjected to the same adjustments by the variably adjustable lever 11. Consequently in all end positions of the main draw lever 23, the auxiliary draw lever 30 has extra motions imparted to it which are of substantially constant amplitude. It will be also understood that since the terminal motions of the two draw levers are determined by the two draw cams respectively, the slur cams have acceleration and deceleration characteristics determined by the additional draw cam, and the thread carriers have acceleration and deceleration characteristics determined by the main draw cams i.e. in the approaches of the thread carrier to the stops ST ST This is illustrated in FIG.
  • plotted lines A, A A B, B B and position C represent conditions for Wide fabric, but it will be seen that for narrow fabric, plotted lines D, D D E, E, E and position C prove that substantially similar characteristics occur irrespective of the width of fabric produced, the curve D being of opposite form to that of the curve E instead of being of the form of curve A It will be also appreciated from FIG. 3, that the carrier rod or driving bar, although having a greater traversing movement than the thread carriers, does not traverse to the same extent as the slur cams.
  • main draw cam in the present instance is advantageously of less diameter than the usual main draw cam.
  • the mechanical construction and arrangement of the additional mechanism is designed to suit a particular machine.
  • the slipper 25 for the main draw lever 23 is shown on a guide bar 32 and connected by a short bracket 25b to the driving bar 2511.
  • the additional draw lever is composed of two parts 30b, 30c interconnected in cranked form to be clear of existing parts in the machine.
  • the upper end of the auxiliary draw lever 30 is shown connected to a slipper 33 which is on a guide rod 34 and is connected to the slur bar 35 for the slurcams SC and a pivoted arm 30d gives added support for the draw levers.
  • FIG. 5 shows that the cross shaft 2 is driven from the usual main cam shaft MCS through gearing G, and it also shows that the draw cams 1, 26 and associated levers 7, 28a are in comparatively close relationship axially of the shaft 2.
  • FIGS. 1 and 7 also show that the draw lever adjusting screw 13 is adjusted in known manner by the selvedge stop lead screws L, L through drive transmitting means DTS.
  • FIG. 8 shows a cross sectional view of the selvedge stop lead screw L part of the drive transmitting means DTS, the selection means SM, and a plurality of the carrier rods CR, the selection means SM being adapted in known manner to be adjusted with the selvedge stops S2 and to be releasably coupled to any one of the carrier rods CR.
  • the mechanism may be modified to some extent without departing from the concept of the invention.
  • the main draw cam or eccentric could be arranged to drive the slurcocks, and the auxiliary draw cam could be designed to provide for the traverse of the thread carriers being with the required less amplitude.
  • first draw mechanism comprising a main draw cam, main draw lever means operable by the main draw cam, means for connecting the main draw lever means, including frictionally, to thread carriers, and means for variably adjusting the main draw lever means under control of selvedge stop adjusting means for controlling stopping of the thread carriers
  • second draw mechanism comprising an additional draw cam and an additional draw lever connected to the main draw cam and the main draw lever means respectively, and means for connecting the additional draw lever to slurcams, to provide for required acceleration and deceleration of the thread carrier and slurcam to be obtained from the first draw cam and the second draw cam respectively.
  • Draw mechanism according to claim 1 having the additional draw lever connected pivotally to the main draw lever means, and the additional draw cam rotatable with the main draw cam and adapted for imparting to the additional draw lever and the slurcams a greater amplitude of movement than the main draw lever means and the thread carriers.
  • Draw mechanism according to claim 1 having the additional draw cam adapted for the slurcams to be traversed thereby with different maximum amplitudes of traverse to suit different adjustments of the selvedge stop adjusting means respectively, and the main draw cam adapted for the thread carriers to be traversed with amplitudes less than said maximum amplitudes respectively.
  • main draw lever means comprises a main draw lever connected to the thread carriers and an auxiliary draw lever connected by adjusting screw and screw nut means to the main draw lever motion transmitting means are connected between said adjusting screw and said selvedge stop adjusting means.
  • Draw mechanism according to claim .1 wherein the main draw lever means comprises a main draw lever connected to the thread carriers and an auxiliary draw lever connected by adjusting screw and screw nut means to the main draw lever, motion transmitting means are connected between said adjusting screw and said selvedge stop adjusting means, and connection between the screw and screw nut means of the auxiliary draw lever and the main draw lever is by slide mechanism.
  • Draw mechanism according to claim 1 having a first drive bar to which the main draw lever and the thread carriers are connected, a second drive bar to which the additional draw lever and the slurcams are connected.
  • Draw mechanism having a first drive bar to which the main draw lever and the thread carriers are connected, a second drive bar to which the additional draw lever and the slurcams are connected, and the thread carriers connected to the first drive bar by frictional connection means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US8170A 1969-02-12 1970-02-03 Straight bar knitting machines Expired - Lifetime US3623342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB748169 1969-02-12

Publications (1)

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US3623342A true US3623342A (en) 1971-11-30

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ID=9833952

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Application Number Title Priority Date Filing Date
US8170A Expired - Lifetime US3623342A (en) 1969-02-12 1970-02-03 Straight bar knitting machines

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US (1) US3623342A (fr)
CH (1) CH510159A (fr)
DE (1) DE2006070B2 (fr)
FR (1) FR2035315A5 (fr)
GB (1) GB1297932A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4440002A (en) * 1981-08-14 1984-04-03 William Cotton Limited Variable draw mechanism for straight bar knitting machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4440002A (en) * 1981-08-14 1984-04-03 William Cotton Limited Variable draw mechanism for straight bar knitting machines

Also Published As

Publication number Publication date
FR2035315A5 (fr) 1970-12-18
GB1297932A (fr) 1972-11-29
CH510159A (fr) 1971-07-15
DE2006070B2 (de) 1973-12-20
DE2006070A1 (de) 1970-08-27

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