US3690126A - Method of operating a warp knitting machine - Google Patents

Method of operating a warp knitting machine Download PDF

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Publication number
US3690126A
US3690126A US143488A US3690126DA US3690126A US 3690126 A US3690126 A US 3690126A US 143488 A US143488 A US 143488A US 3690126D A US3690126D A US 3690126DA US 3690126 A US3690126 A US 3690126A
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United States
Prior art keywords
weft
storage
knitting
weft storage
drive connection
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Expired - Lifetime
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US143488A
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English (en)
Inventor
Walter Reiners
Albert Tho Pesch
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Oerlikon Textile GmbH and Co KG
Original Assignee
W Schlafhorst AG and Co
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Publication date
Application filed by W Schlafhorst AG and Co filed Critical W Schlafhorst AG and Co
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Publication of US3690126A publication Critical patent/US3690126A/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B23/00—Flat warp knitting machines
    • D04B23/12—Flat warp knitting machines with provision for incorporating unlooped wefts extending from selvedge to selvedge

Definitions

  • ABSTRACT Method of operating a warp knitting machine includes, after interruption of a weft running to the weft storage and after shut-down of the machine, severing the drive connection between the weft storage and the knitting instruments, removing the length of weft extending from the break thereof to the weft storage, thereafter placing the weft storage in filling position, automatically refilling the weft reserve remaining in the weft storage, and restoring the drive connection between the weft storage and the knitting instruments so as to resume the knitting process.
  • the invention relates to method of operating a warp knitting machine and more particularly such warp knitting machine that has a weft insertion device and a weft storage for the weft being inserted as well as a shut-down device activated at interruption of a weft running to the weft storage.
  • wefts are advantageously made ready by means of weft storages for transfer to the knitting instruments.
  • weft supply thus forming, the omission of a weft in the knitted web during the slow-down phase of the warp knitting machine after a break in the weft has occurred, is sought to be avoided. Since weft breaks during the knitting operation can never fully be avoided, care must be taken that, before the knitting machine is restarted after shut-down due to a weft break, a faultless reconnection of the broken weft to the supply thereof remaining in the weft storage is achieved.
  • the thread material from the weft storage that was used up during the slow-down of the machine must be replaced, and the weft supply must be restored to the required number of readied wefts.
  • the restoration of the interrupted weft filling and the connection or joining thereof to the completed knitted web is possible, however, only after burdensome seeking of the thread ends and by guiding the thread manually about each of the numerous storage members that hold the wefts in readiness. Such an operation results in long periodsof inaction and a sharp reduction in the net efficiency of the machine.
  • method of operating a warp knitting machine having a weft insertion device, a weft storage for the weft that is to be inserted, a plurality of knitting instruments drivingly connectible to the weft storage, and a machine shut-down device activated at interruption of a weft being fed to the weft storage, which comprises, after interruption of a weft running to the weft storage and after shut-down of the machine, severing the drive connection between the weft storage and the knitting instruments, removing the length of weft extending from the break therein to the weft storage, thereafter placing the weft storage in weft-filling position, automatically refilling the weft reserve remaining in the weft storage, and restoring the drive connection between the weft storage and the knitting instruments for resuming the knitting process.
  • the severing and restoration of the drive connection between the weft storage and the knitting instruments is effected at a predetermined clutch position so that, after a weft interruption or break, the knitting instruments per se, such as the needle bar, insertion bar, knocking-over bar and the like, upon reaching the clutch position, tend to remain in a position which affords the most favorable qualifications for re-inserting the weft from the subsequently filled weft storage and for continuing the knitting process.
  • both the weft storage as well as a weft inserter or depositor, which serves to insert the weft, is brought into a starting position, then the weft is threaded into the weft inserter, and thereafter deposited at the weft storage in folded lengthsuFor this purpose, a thread guide traveling in a circular revolving path may serve as the weft inserter or folder, the thread guide coming to a stop at a selected point of the revolving path thereof, after the slow-down of the machine has terminated.
  • the starting position of such a weft inserter is advantageously located in the vicinity of the edges of the knitted web since it is most readily accessible thereat and secured to the holder elements of the weft storage in an especially simple manner. After the weft end coming from the weft inserter has been deposited at the weft storage following the connection thereof to the weft still present in the weft storage, filling of the weft storage can be effected fully automatically by the weft inserter.
  • the weft inserter executes a predetermined number of revolutions and fills with the missing number of thread lengths the weft storage which is displaced simultaneously in direction toward the yet stationary knitting instruments.
  • the weft which has not yet been knitted into the web after the knitting machine has come to a stop following a weft break and which has been severed from the last knitted weft in the vicinity of an edge of the knitted web preparatory to refilling the weft storage, is located again in the original position thereof at the knitting instruments, the aforementioned predetermined clutch position is attained simultaneously therewith and the drive connection between the weft storage and the knitting instruments can be restored. The knitting process per se is then continued.
  • Advantages deriving from the method invention of this application are especially that a weft storage, after interruption of the weft supply and an especially short slow-down period before the knitting machine comes to a final stop, can be completely refilled automatically by the weft inserter, the weft threads still remaining intact in the weft storage being useable further, and that only few manipulations are required for carrying out the method invention.
  • FIG. 1 is a simplified diagrammatic plan view of part of a Raschel knitting machine with weft storage and weft filler shown in reduced scale;
  • FIGS. 2, 3 and 4 are diagrammatic longitudinal views of the weft filler of FIG. 1 shown in three different stages;
  • FIG. is an enlarged elevational view of a detail of the weft storage of FIG. 1 showing the knitting instruments in cross section;
  • FIG. 6 is another view of FIG. 5 with the weft storage shown in a different angular position.
  • FIG. 1 there is shown a needle bar 1 having knitting needles 2 and a knitted web 3 into which a continuous weft 4 is knitted.
  • the weft 4 comes from a supply coil 5 and, during the knitting operation, is alternatingly placed by a continuously revolving thread or weft filler 6 about the individual holder members 9 and 9a of the weft insert wheels 10 and 10a of a weft storage 11 and, in the embodiment shown in FIG. 1, is knitted into the web with each course.
  • FIG. 1 those components which deliver the individual weft behind the knitting needles 2, are omitted from the figure.
  • FIG. 1 shows, furthermore, the ends 4and 4"of the broken thread 4 which have come out of the guiding eye 7 during the slow-down movement of the thread feeder 6.
  • the diagrammatic view of FIG. 1 shows all of the cooperating members is stationary position attained after the occurrence of a thread break and the attendant slow-down phase. It is readily apparent that due to a very short slow-down of the knitting machine, the supply of weft in the weft storage 11 in the illustrated embodiment still consists of four weft lengths which can be used further after the weft storage is refilled.
  • the machine After the machine shuts down, it travels thereafter, for example at crawling speed, until it reaches a predetermined clutch position at point 13 on the revolving path 12 which corresponds to the position of the guiding eye 7 of the thread feeder 6, as shown in FIG. 3, and is held in that position.
  • a predetermined clutch position at point 13 on the revolving path 12 which corresponds to the position of the guiding eye 7 of the thread feeder 6, as shown in FIG. 3, and is held in that position.
  • all of the knitting instruments are also located in a position advantageous for again inserting a weft.
  • Such position of the knitting instruments is shown, for example in FIGS. 5 and 6, wherein one of the knitting needles 2, of the latch type in the illustrated embodiment, and part of a conventional stitch comb 17 are clearly seen.
  • the weft storage 11 is then brought into the starting position thereof and the weft storage 11 is simultaneously set in the filling position thereof.
  • the weft storage 11 can be revolved both in direction of the arrow 20 as well as in the opposite rotary direction of the arrow 16 until it is determined by suitable conventional sensing means, Not shown in the drawing, that the last weft length still present in the weft storage 11 has been made ready for connection with the weft lengths that are to be newly inserted.
  • the guiding eye 7 of the thread feeder 6 assumes the position of the point 15 in FIG. 4.
  • the filling position of the weft storage 11 is shown in FIG. 5. In this position, the end 4of the weft 4 extending from the supply coil 5 is again threaded through the guiding eye 7 in case it has slipped out of the latter and is secured to the holder member 9'of the weft insertion wheel 10.
  • each of the two weft insertion wheels 10 has eight holder members 9, 9'. Only the weft insertion wheel 10 located in the vicinity of the edge 18 of the knitted web shown in FIG. 1 is illustrated in FIGS. 5 and 6. Since four wefts 4 were still present in the weft storage 11 before it is refilled, as seen in FIG. 5, four additional wefts became stored after two complete revolutions of the thread feeder or inserter 6, starting from the clutch position at point 13 in FIG. 3, with the simultaneous rotation of the weft insertion wheels 10 and 10a in direction of the arrow 16.
  • the weft length 4a which was severed from the last knitted weft and which remains in the weft storage 11, is again located in the original insertion position thereof, so that upon restoration of the drive connection between the knitting instruments and the weft storage, which also occurs at the point 13 in FIG. 3, it can be fed or disposed behind the knitting needles 2 by the indicated stitch comb l7 and can be knitted into the web 3 that is located above the knocking-over bar 19.
  • FIG. 5 there is shown quite schematically the drive connection for the weft storage 11 and knitting instru ments 1, 2, 19 as intersecting dot-dash lines, a clutch of the aforementioned type being connected between the weft storage and the knitting instruments. Also shown very schematically in FIG. 1 is a feeler or sensing member 20 normally engaging the weft 4 and releasable by the breaking of the weft 4 to open the power circuit to the knitting machine and thereby shut down the machine.
  • Method of operating a warp knitting machine having a weft insertion device, a weft storage for the weft that is to be inserted, a plurality of knitting instruments drivingly connectible to the weft storage, and a machine shut-down device activated at interruption of a weft being fed to the weft storage, which comprises, after interruption of a weft running to the weft storage and after shutdown of the machine, severing the drive connection between the weft storage and the knitting instruments, removing the lengthl ll 11 of weft extending from the break thereof to the weft storage, thereafter placing the weft storage in filling position, automatically refilling the weft reserve remaining in the weft storage, and restoring the drive connection between the weft storage and the knitting instruments so as to resume the knitting process.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US143488A 1970-05-16 1971-05-14 Method of operating a warp knitting machine Expired - Lifetime US3690126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702024087 DE2024087A1 (de) 1970-05-16 1970-05-16 Verfahren zum Betneb einer Ketten wirkmaschine

Publications (1)

Publication Number Publication Date
US3690126A true US3690126A (en) 1972-09-12

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Family Applications (1)

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US143488A Expired - Lifetime US3690126A (en) 1970-05-16 1971-05-14 Method of operating a warp knitting machine

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US (1) US3690126A (cg-RX-API-DMAC7.html)
JP (1) JPS4810506B1 (cg-RX-API-DMAC7.html)
CS (1) CS152498B2 (cg-RX-API-DMAC7.html)
DE (1) DE2024087A1 (cg-RX-API-DMAC7.html)
GB (1) GB1320622A (cg-RX-API-DMAC7.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906749A (en) * 1972-12-27 1975-09-23 Schlafhorst Co Maschf Weft storage device for warp knitting machines
US3948722A (en) * 1973-07-28 1976-04-06 Scapa-Porritt Limited Warp knitted paper maker's felt and method for the production thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616656A (en) * 1968-07-19 1971-11-02 Reiners Walter Warp knitting machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616656A (en) * 1968-07-19 1971-11-02 Reiners Walter Warp knitting machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906749A (en) * 1972-12-27 1975-09-23 Schlafhorst Co Maschf Weft storage device for warp knitting machines
US3948722A (en) * 1973-07-28 1976-04-06 Scapa-Porritt Limited Warp knitted paper maker's felt and method for the production thereof

Also Published As

Publication number Publication date
DE2024087A1 (de) 1971-12-02
JPS4810506B1 (cg-RX-API-DMAC7.html) 1973-04-04
CS152498B2 (cg-RX-API-DMAC7.html) 1973-12-19
GB1320622A (en) 1973-06-20

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