US3236067A - Warp knitting machine - Google Patents

Warp knitting machine Download PDF

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Publication number
US3236067A
US3236067A US390066A US39006664A US3236067A US 3236067 A US3236067 A US 3236067A US 390066 A US390066 A US 390066A US 39006664 A US39006664 A US 39006664A US 3236067 A US3236067 A US 3236067A
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US
United States
Prior art keywords
needles
trick plate
movement
frame
warp knitting
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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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US390066A
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English (en)
Inventor
Scheibe Walter Hugo
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.)
KNIT ALL RES AG
Original Assignee
KNIT ALL RES AG
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Filing date
Publication date
Application filed by KNIT ALL RES AG filed Critical KNIT ALL RES AG
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Publication of US3236067A publication Critical patent/US3236067A/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/06—Needle bars; Sinker bars
    • D04B27/08—Driving devices therefor
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/34—Take-up or draw-off devices for knitted products

Definitions

  • the present invention relates to warp knitting machines in general and to such machines comprising latch needles which are guided in a trick plate situated behind the needles and a stitch comb, which is movable in a path substantially perpendicular to the plane of the needles and which engages between the needles to hold down the fabric during upward movement of the needles but is moved away from the needles, when necessary, so as to avoid interference with the feeding of yarn to the needles, in particular.
  • Raschel machines were originally used as slow-running machines in the production of knitted fabrics, but have recently been considerably improved and their working speed increased so that they have been widely adopted for the manufacture of tulle. It is known in such machines to locate the stitch comb at the latch side of the needles and to mount on it a stop for the needle latches.
  • the needles have to be raised to a level above the edge of the trick plate sufficient to ensure that the new loops formed in the hooks of the needles during the preceding downward movement will be guided over the open needle latches and stripped from the latches.
  • FIGURE 1 is a vertical section through the machine, designated in accordance with the present invention.
  • FIG. 2 is an elevation, on a larger scale, of the needlebar drive of the machine disclosed in FIG. 1, in the top dead center position;
  • FIG. 3 is an elevation, on a larger scale, of trickplate drive of the machine disclosed in FIG. 1, likewise in the top dead center position;
  • FIG. 4 is a graph disclosing the needle movement
  • FIG. 5 is a graph disclosing the trick-plate movement
  • FIG. 6 is an elevation, on a larger scale, of another embodiment of the needle-bar drive.
  • FIG. 7 is a section along the lines 77 of FIG. 1.
  • FIG. 1 the warp knitting machine is a known type and a machine of this type is more fully described in US. Patent No. 2,744,398, dated May 8, 1956. Only the more important parts, therefore, are shown in FIG. 1.
  • the machine frame 1 is supported by feet 2 and includes end plates 3, between which extends a tubular support 8 carrying bearings 7 for a shaft 5 on which are mounted guide bars 24 and 24a which carry yarn guides 16 and 16a, respectively.
  • the yarn is taken to the yarn guides 16 and 16a from spools 25 and 26 over tensioners 30 which are pivotallyv mounted on brackets 31 carried by the tube 8.
  • cam shaft 46 and shaft 52 are journalled in the end plates 3.
  • the cam shaft 46 carries a belt pulley which is driven by a belt 43 from a belt pulley 44 of an electric motor 42, having a. regulator 37 which is adjustable by a hand wheel 38.
  • the motor 42 is provided with a safety switch 41.
  • the frame 1 carries brackets 9 which support a shaft 10, provided with a hand wheel 40 and geared to the cam shaft 46 so as to enable the machine to be turned by hand.
  • Bell cranks 53 (FIGS. 1 and 2) pivoted to the shaft 52 carry cam rollers 54 which cooperate, respectively, with cams 47 and 47a on the cam shaft 46.
  • the bell cranks 53 are connected by rocking levers 51 to a needle bar carrying needles 50a which receive from the cam shaft 46 an arcuate oscillating movement, as indicated at 64.
  • FIG. 4 shows the movement imparted to the needles 50a during each machine cycle, that is to say during one revolution of the cam shaft 46.
  • a stitch comb 55 is disposed adjacent the latches of the needles 50a and is carried by rocking levers 59 (FIG. 1) which are connected to hell cranks 57 which are pivoted to a shaft 58 extending between the end plates 3.
  • Each bell crank 57 carries a pair of cam rollers 56, which, like the cam rollers 54, engage a pair of cams 57 Patented Feb. 22', 1966- e and 570, which are mounted on the cam shaft 46 and move the stitch comb 55, as indicated at 63, towards and away from the needles 50a, so that it will hold down the knitted fabric during the upward travel of the needles 50a and withdraw from the needles 50a to make room for the laying of yarn from one needle to another under control of the guide bars 24 and 24a.
  • the stitch comb 55 has pinshaped stops 55' arranged in the path of the latches 50b.
  • the cam shaft 46 also carries other cams 46 and 46a, which rock the guide bars 24 and 24a about the shaft by means of cam levers 60, mounted on the shaft 52, and linkage 61, 62.
  • the guide bars 24 and 24a can also be shifted along the shaft 5' by a drive mechanism (not shown) of any suitable structure.
  • the needles 50a are guided in a trick plate 65 (FIGS. 1 and 3), which is carried by rocking levers 66 mounted on the shaft 52 and connected to bell cranks 67. These carry cam rollers 68 which cooperate with earns 69 and 70 on the cam shaft which impart to the trick plate 65, during each machine cycle, the upward and downward motion illustrated in FIG. 5.
  • the trick plate 65 is moving downwardly. As a result, the distance which the needle bar 50 needs to travel, the acceleration of the moving parts, and the accelerating forces are reduced.
  • the machine may, therefore, be run faster, without strengthening the levers, rollers, cams and bearings, than is possible with a machine having a stationary trick plate.
  • FIGS. 4 and 5 also show that when the needles 50a are moving towards their lowest position, the trick plate 65 first moves upwardly with the effect described above. However, as the needles 50a near their lowest position, the trick plate 65 moves downwardly and, therefore, in the same direction as the needles 500. This has the same effect as when the needles dwell in the bottom dead center position with a stationary trick plate and increases the time available for knocking over, that is to say it increases the angle of rotation of the cam shaft 46 which is available for knocking over. This, again, facilitates increase in the speed of the machine and permits the cams to be so designed as to impart less acceleration. Less tension is, therefore, imposed on the yarns, the risk of yarn breakage is avoided and a uniform, firm fabric, free of faults is assured even with a high machine speed.
  • the finished fabric is pulled down over the trick plate 65 in the usual manner and conveyed by intermediate rollers 33 and 34 to a take-up roll 35 (FIG. 1).
  • the needle bar 50, the trick plate 65 and the stitch comb 55 may be actuated by a socalled Roman drive, such as that described in British Patent No. 525,255.
  • a socalled Roman drive such as that described in British Patent No. 525,255.
  • Such a drive, as applied to the needle bar 50 is shown in FIG. 6. It consists of two shafts 19 and 20 which are coupled by meshing gearwheels 71 and 72 and carry eccentrics 48 and 49, respectively.
  • the shaft 19 runs twice as fast as the shaft 20, and one of these shafts is driven by the electric motor 42 by any conventional means (not shown).
  • the eccentricity of the eccentric 49 on the shaft 20 is twice as great as the eccentricity of the eccentric 48 on the shaft 19. When the eccentric 49 is in its bottom dead center position, the eccentric 48 is also in its bottom dead center position.
  • the connecting rods 73 and 74 of the eccentrics 48 and 49- drive a two-armed lever 75 to which is pivoted a link 76.
  • the point of articulation of the link 76 to the lever 75 is twice as far away from the point of connection of the connecting rod 73 to the lever 75 as it is from the point of connection of the connecting rod 74.
  • the link 76 is pivoted at its upper end to the rocking lever 51.
  • a guide link 77 which is pivoted at one end to the link 76 and at the other to a fixed point 78 of the frame of the machine, forms a parallelogram linkage with the link 76 and the rocking lever 51.
  • the needle bar 50 is caused to execute a movement such as is shown in FIG. 4, during each revolution of the shaft 20.
  • the path of the movement of the needle bar 50 of the machine can be varied within wide limits and adapted to the motion required. Similar considerations apply, of course, to the movements of the trick plate and the stitch comb 55.
  • the Roman drive produces a more favorable distribu tion of forces than the cam drive shown in FIGS. 2 and 3.
  • the intermediate rollers 33 and 34 (FIG. 1) on extensions of the rocking levers 66 which'carry thetrick plate 65, so allowing them to participate in the movement of the trick plate, and eliminating the tension roller 12.
  • the link 76 and the guide link 77 may be replaced by a piston rod guided in a cylinder and carrying a bar to which the trick plate 65 is secured and on which the intermediate rollers are mounted.
  • a warp knitting machine comprising a frame, a trick plate movably disposed in said frame, a plurality of latch needles movably disposed in said frame and guided in said trick plate, the latter being positioned behind said latch needles, a stitch comb mounted in said frame for a reciprocating movement in a path substantially perpendicular to the plane of the needles, means for reciprocating said latch needles within said frame, and means for moving said trick plate in a path substantially parallel to the path of movement of said latch needles, and means causing said trick plate to move substantially in a direction opposite to that of the movement of said latch needles.
  • a warp knitting machine comprising a frame, a trick. plate movably disposed in said frame, a plurality of latch needles movably disposed in said frame and guided in said trick plate, the latter being positioned behind said latch needles, a stitch comb mounted in said frame at the latch side of the needles for a reciprocating movement in a path substantially perpendicular to the plane of the needles and including stop means for the latches of said needles, means for reciprocating said latch needles within said frame, and means for moving said trick plate in a path'substantially parallel to the path of movement of said latch needles, and means causing said trick plate to move substantially in a direction opposite to that of the movement of said latch needles.
  • the warp knitting machine as set forth in claim 1, which includes means causingsaid trick plate to move substantially in the same direction as that of the movement of said latch needles, when the latter are in the: vicinity of the bottom dead center position during knock.- 1ng over.
  • the warp knitting machine as set forth in claim 1, which includes supporting means for said trick plate mounted on said frame, and rollers, rotatably mounted on said supporting means, for withdrawing the produced fabric, so that the distance of said rollers from the upper edge of said trick plate remains constant.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US390066A 1963-08-24 1964-08-17 Warp knitting machine Expired - Lifetime US3236067A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU44325 1963-08-24

Publications (1)

Publication Number Publication Date
US3236067A true US3236067A (en) 1966-02-22

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ID=19723488

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Application Number Title Priority Date Filing Date
US390066A Expired - Lifetime US3236067A (en) 1963-08-24 1964-08-17 Warp knitting machine

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US (1) US3236067A (de)
DE (2) DE1910625U (de)
GB (1) GB1019686A (de)
LU (1) LU44325A1 (de)
NL (1) NL6409694A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464235A (en) * 1966-12-14 1969-09-02 Clutsom & Kemp Ltd Raschel warp knitting machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20030019A1 (it) * 2003-11-25 2004-02-24 Franco Sciacca Metodo e attrezzatura per variare la densita' di maglia nella produzione di tessuti e articoli tubolari ottenuti con telai raschel e prodotti risultanti.
ITBS20060060A1 (it) * 2006-03-16 2007-09-17 Santoni & C Spa Macchina tessile lineare

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE864602C (de) * 1951-06-08 1953-01-26 Walter H Scheibe Nadelfuehrung an Wirkmaschinen, insbesondere Raschelmaschinen
US2744398A (en) * 1951-04-28 1956-05-08 Scheibe Walter Warp knitting machine
GB930106A (en) * 1958-10-16 1963-07-03 Karl Mayer Erste Hessische Wir Raschel warp knitting machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE636605C (de) * 1936-10-12 Emil Wirth Wirkmaschinenfabrik Einnadelbarrige Kettenwirkmaschine
DE205700C (de) *
DE653163C (de) * 1936-02-22 1937-11-16 Emil Wirth Wirkmaschinenfabrik Doppelkettenwirkmaschine
DE874356C (de) * 1951-04-29 1953-04-23 Walter H Scheibe Ketten-Wirkmaschine und Verfahren zur Herstellung von einnaedligen Schnurenlegungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744398A (en) * 1951-04-28 1956-05-08 Scheibe Walter Warp knitting machine
DE864602C (de) * 1951-06-08 1953-01-26 Walter H Scheibe Nadelfuehrung an Wirkmaschinen, insbesondere Raschelmaschinen
GB930106A (en) * 1958-10-16 1963-07-03 Karl Mayer Erste Hessische Wir Raschel warp knitting machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464235A (en) * 1966-12-14 1969-09-02 Clutsom & Kemp Ltd Raschel warp knitting machine

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Publication number Publication date
NL6409694A (de) 1965-02-25
DE1910625U (de) 1965-02-25
GB1019686A (en) 1966-02-09
LU44325A1 (de) 1963-12-09
DE1290653B (de) 1969-03-13

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