US3296837A - Thread cutting device - Google Patents

Thread cutting device Download PDF

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Publication number
US3296837A
US3296837A US418832A US41883264A US3296837A US 3296837 A US3296837 A US 3296837A US 418832 A US418832 A US 418832A US 41883264 A US41883264 A US 41883264A US 3296837 A US3296837 A US 3296837A
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United States
Prior art keywords
cutting
rotatable
needles
threads
withdrawn
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Expired - Lifetime
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US418832A
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English (en)
Inventor
Keck Siegfried
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MASCHINENFABRIK CARL MERZ KG
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MASCHINENFABRIK CARL MERZ KG
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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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/60—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices

Definitions

  • Still another object of this invention consists in the provision of a device as set forth above which is relatively simple in construction and operation.
  • FIG. 1 illustrates a thread-cutting device according to the present invention showing the location of the cut to be effected between dial disc and the knitting being withdrawn.
  • FIG. 2 illustrates a rotatable cutting knife with a plurality of teeth, said cutting knife being arranged on a stationary counter knife having a cutting tooth.
  • FIG. 3 shows a rotating flat cutting knife with two cutting edges, which cutting knife is mounted on a stationary counter knife having a cutting tooth.
  • FIG. 4 illustrates a thread-cutting device according to the invention for cutting the threads between the dial disc and the knit article and shows the device in a location above the needle circle and above the needles withdrawn for purposes of knitting off.
  • FIG. 5 represents an embodiment of the thread-cutting device according to the invention with separate drive by electric motor or air turbine.
  • FIGS. 6 and 7 respectively illustrate in working position and out of working position a device according to the invention in which, when a needle break occurs, the cutting teeth and cutting knives at the cutting station are protected against damage.
  • the present invention is characterized primarily in that a rotatable cutting knife is provided with at least one tooth and located eccentrically with regard to the cylinder axis, or a rotatable flat knife with at least one blade is pressed against a counter knife with at least one tooth and with a greater diameter adapted to protect the rotating knife against non-withdrawn needles.
  • a cutting station which is always in readiness for a cutting operation and which is located inside the needle circle for the reinforcing threads or change ends guided thereto.
  • This cutting station is introduced outside at an incline from the outside to the cylinder axis so deeply between the dial disc and the knit article moving away from the dial above the needles which are withdrawn for a knitting off-operation, that the threads can be cut off with extremely short ends.
  • the necessary high speed of the rotating cutting knife may be effected separately mechanically, by an electric motor or by an air turbine.
  • the drive of the rotating cutting knife with a great number of teeth is characterized in that a gear with line teeth which is fixedly connected to the dial disc and therefore rotates at the cylinder speed and concentrically with regard to the cylinder axis, rolls on a gear ring with similar teeth of the rotating cutting knife.
  • a protective and stopping device When the thread guiding device according to the invention is introduced between the dial disc and the knit article, it may, due to its location above the needles which are lowered for purposes of knitting off, be subjected to danger when a needle broken at the needle butt cannot be withdrawn.
  • This protective and stopping device is characterized in that the non-withdrawn needle moves against a lever which has a double function inasmuch as it places itslf in a protective manner in front of the cutting tooth of the counter knife so that the needle during its further course can spring against the larger circumference of the counter knife which protects the rotating cutting knife.
  • the entire thread cutting device is adapted when moving back above the needle circle to bring about the actuation of an electric circuit for stopping the machine.
  • Knives 1 and 3 together form the cuttingoff station 22 for a thread 19 to be cut off.
  • Counter knife 3 has a cutting tooth 4 (FIGS. 2 and 3) and its diameter is greater than the diameter of cutting knife 1 3 to such an extent that teeth of the rotatable cutting knife 1 (FIG. 2) or the two cutting edges 50 of cutting knife 1a (FIG. 3) will be protected against damage.
  • the thread cutting device is driven by teeth 1b pro vided on cutting knife 1 which mesh with the teeth 6a of a counter gear 6 (FIG. 1).
  • Gear 6 is fixedly connected to a dial disc 7 and steps up the speed of the rotating cutting knife 1.
  • Gear 6 is coaxially arranged with regard to the cylinder axis 23a and rotates at the same speed as cylinder 23.
  • a disk 61) connected to the gear has its circumferential area provided with cutouts 69 which positively assure the feeding of threads 19 to be cut.
  • a disc spring 20 arranged within a recess of cutting knife 1 or cutting knife 1a furnishes the pressure necessary for causing members 1 and 3, or 1a and 3 to sharpen each other.
  • the cutting device with teeth 5 and cutting edges 50 according to FIGS. 2 and 3 respectively would, for purposes of assuring extremely short thread ends, require a higher speed than could be obtained by means of the arrangement of FIG. 1.
  • This higher speed is expediently obtained by the drive illustrated in FIG. 5 which is independent of the rotation of the cylinder and comprises an electric motor or air turbine 25.
  • FIG. 1 indicates how deep and to what extent the rotatable cutting knife 1 can be moved over needles 9, sinkers 24 and knitting 21 in order to permit cutting off of the threads with very short thread ends.
  • the thread cutting device is located at that portion of needle circle 8 (FIG. 4) where the needles 9 are being withdrawn for knitting off.
  • FIG. 4 clearly illustrates needle circle 8 with needles 9 withdrawn for the knittingoff operation by means of cam members in a manner well known in the art.
  • Cutting knife 1 has been moved inwardly above the needle circle 8 to such an extent that threads 19 which are fed by cutouts 60 of the disc 6b (shown only partially in FIG. 4) are conveyed to the cutting station 22 so that they can be cut off very closely.
  • FIGS. 4 and 6 If it should occur that a needle 9 cannot be withdrawn in view of a broken off butt, the needle will, in conformity with FIGS. 4 and 6 strike or abut against an arm 10- of a double-lever 11 pivotable about a shank 13. Arm 10 will thus be deflected into a protective position in front of cutting station 22 (FIGS. 4 and 7) which is formed by cutting tooth 4 (FIGS. 2 and 3) of counter knife 3 and teeth 5 or cutting edges 50 of rotating cutting knife 1, 1a, respectively. The non-withdrawn needle which is bent inwardly by the lever 10 will then spring back and slide along counter knife 3 without causing any damage.
  • a counter lever 12 (FIGS. 6, 7) of a two-arm lever 11 will by means of a sliding bolt 14 cause a lever arm 15 to perform a tilting movement about a bolt 16 whereby the thread cutting device mounted on lever 15 will be tilted back from needle circle 8.
  • FIG. 6 illustrates the thread cutting device in its cutting position in which arm 10 of two-arm lever 11 is permitted to be located over needle circle 8 only to such an extent that the threads being introduced into the cutting station 22 will not be interfered with, while on the other hand a non-withdrawn needle 9 (as described in connection with FIG. 4) will take care of returning the thread cutting device to its rest position shown in FIG. 7 against the thrust of a spring 17.
  • Lever 15 tiltable about a bolt 16 will abut against an electric contact 18 which in its turn will bring about stoppage of the machine.
  • a cutting device for cutting off threads, especially reinforcing threads in the sole and heel area of stockings and for cutting off threads during the change of threads with round knitted stockings, said cutting device comprising: rotatable cutting means arranged eccentrically with regard to the axis of rotation of said cylinder, nonrotatable cutting means adjacent said rotatable cutting means and together therewith forming a cutting station for cutting off threads fed into the circle of needles, said nonrotatable cutting means protruding beyond said rotatable cutting means for protecting the latter against damage by non-withdrawn broken needles, said rotatable cutting means and said nonrotatable cutting means being inclined with regard to the axis of rotation of said cylinders so that the plane of said cutting station is located between said dial disc and the withdrawn needles whereby the thread to be cut off from a knitting being Withdrawn can be cut off very closely to
  • a cutting device for cutting off threads, especially reinforcing threads in the sole and heel area of stockings and for cutting off threads during the change of threads with round knitted stockings, said cutting device comprising: rotatable cutting means arranged eccentrically with regard to the axis of rotation of said cylinder, nonrotatable cutting means adjacent said rotatable cutting means and together therewith forming a cutting station for cutting off threads fed into the circle of needles, spring means continuously and resiliently pressing said rotatable cutting means against said nonrotatable cutting means, said nonrotatable cutting means protruding beyond said rotatable cutting means for protecting the latter against damage by non-withdrawn broken needles, said rotatable cutting means and said nonrotatable cutting means being inclined with regard to the axis of rotation of said cylinder so that the plane of said cutting station is located between said dial disc and the withdrawn needles where
  • a cutting device for cutting off threads, especially reinforcing threads in the sole and heel area of stockings and for cutting off threads during the change of threads with round knitted stockings, said cutting device comprising: rotatable cutting means arranged eccentrically with regard to the axis of rotation of said cylinder, nonrotatable cutting means adjacent said rotatable cutting mean and together therewith forming a cutting station for cutting off threads fed into the circle of needles, said nonrotatable cutting means protruding beyond said rotatable cutting means for protecting the latter against damage by non-withdrawn broken needles, said rotatable cutting means and said nonrotatable cutting means being inclined with regard to the axis of rotation of said cylinder so that the plane of said cutting station is located between said dial disc and the withdrawn needles whereby the thread to be cut oil from a knitting being withdrawn can be cut ofi very closely to the
  • said drive means comprises an axial section of said rotating cutting means provided with first teeth, and an axial section of said dial disc provided with second teeth which mesh with said first teeth when said cutting device is moved to dispose said cutting station in cutting position, the ratio of said second teeth to said first teeth being such as to step up the speed of rotation of said rotatable cutting means relative to the rotation of said dial disc.
  • a cutting device for cutting 01? threads, especially reinforcing threads in the sole and heel area of stockings and for cutting off threads during the change of threads with round knitted stockings, said cutting device comprising: rotatable cutting means arranged eccentrically with regard to the axis of rotation of said cylinder, nonrotatable cutting means adjacent said rotatable cutting means and together therewith forming a cutting station for cutting off threads fed into the circle of needles, said nonrotatable cutting means protruding beyond said rotatable cutting means for protecting the latter against damage by non-withdrawn broken needles, said rotatable cutting means and said nonrotatable cutting means being inclined with regard to the axis of rotation of said cylinder so that the plane of said cutting station is located between said dial disc and the withdrawn needles whereby the thread to be cut oil from a knitting being withdrawn can be cut off very closely to the

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US418832A 1963-12-20 1964-12-16 Thread cutting device Expired - Lifetime US3296837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM0059329 1963-12-20

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US3296837A true US3296837A (en) 1967-01-10

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US418832A Expired - Lifetime US3296837A (en) 1963-12-20 1964-12-16 Thread cutting device

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DE (1) DE1585187B1 (de)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713254A (en) * 1953-02-12 1955-07-19 Minton Clarence Webb Yarn holder and cutters
US2952148A (en) * 1955-04-20 1960-09-13 Wayne Knitting Mills Lap yarn end cutting attachment for circular knitting machine
US3055199A (en) * 1956-06-13 1962-09-25 Gordon Company Yarn clamping and severing mechanism for knitting machines
US3075374A (en) * 1960-10-04 1963-01-29 Bentley Knitting Machinery Org Yarn clamping and severing mechanism for knitting machines
US3100977A (en) * 1960-02-15 1963-08-20 Billi Giorgio Yarn severing device for circular knitting machines
US3100976A (en) * 1960-02-16 1963-08-20 Billi Giorgio Yarn severing device for a circular knitting machine
US3164975A (en) * 1961-10-07 1965-01-12 Schubert & Salyer Maschinenfab Knitting apparatus
US3197977A (en) * 1960-02-05 1965-08-03 Gordon Company Yarn clamping and severing mechanism for multi-feed circular knitting machines
US3206948A (en) * 1963-04-12 1965-09-21 Bella Italo Della Thread shearing device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB761975A (en) * 1953-02-26 1956-11-21 Toone Nottingham Ltd B Improvements in or relating to knitting machines

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713254A (en) * 1953-02-12 1955-07-19 Minton Clarence Webb Yarn holder and cutters
US2952148A (en) * 1955-04-20 1960-09-13 Wayne Knitting Mills Lap yarn end cutting attachment for circular knitting machine
US3055199A (en) * 1956-06-13 1962-09-25 Gordon Company Yarn clamping and severing mechanism for knitting machines
US3197977A (en) * 1960-02-05 1965-08-03 Gordon Company Yarn clamping and severing mechanism for multi-feed circular knitting machines
US3100977A (en) * 1960-02-15 1963-08-20 Billi Giorgio Yarn severing device for circular knitting machines
US3100976A (en) * 1960-02-16 1963-08-20 Billi Giorgio Yarn severing device for a circular knitting machine
US3075374A (en) * 1960-10-04 1963-01-29 Bentley Knitting Machinery Org Yarn clamping and severing mechanism for knitting machines
US3164975A (en) * 1961-10-07 1965-01-12 Schubert & Salyer Maschinenfab Knitting apparatus
US3206948A (en) * 1963-04-12 1965-09-21 Bella Italo Della Thread shearing device

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DE1585187B1 (de) 1970-11-19

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