US3347282A - Weft thread-cutting mechanism for shuttleless looms - Google Patents

Weft thread-cutting mechanism for shuttleless looms Download PDF

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Publication number
US3347282A
US3347282A US514069A US51406965A US3347282A US 3347282 A US3347282 A US 3347282A US 514069 A US514069 A US 514069A US 51406965 A US51406965 A US 51406965A US 3347282 A US3347282 A US 3347282A
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United States
Prior art keywords
weft thread
arm
weft
cutting mechanism
jaws
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Expired - Lifetime
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US514069A
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English (en)
Inventor
Kokkinis Nikolaus
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads

Definitions

  • This invention relates to a weft thread cutting mechanism for use in shuttleless looms which eliminates the disadvantages and drawbacks of known arrangements of cutting off or severing weft threads in a fabric in a simple manner so that in shuttleless looms in which weft threads are inserted by means of gripper systems, the threads may be inserted individually and no complicated embedding apparatus is required to form an edge.
  • the mechanism of the present invention includes an arm which is pivotally mounted On an axle or shaft, the movement of the arm being coupled with the weft thread-inserting device.
  • the arm carries, at the end thereof, a fixed and a movable jaw, the tips of which jaws extend through the warp threads of the shed in one of the end positions of an oscillating movement of the arm and, in such position, sever the weft thread between the jaws.
  • the movable jaw is closed on the fixed jaw so that no gap exists between them and the action of the jaws is coordinated with the weft thread-inserting device.
  • the weft thread is drawn off from large supply spools and inserted either in the form of individual threads or as U-shaped loops.
  • the required length of the weft thread must be measured and cut off each time.
  • special clamping and cutting means generally must be provided between the supply spool and the selvage for this purpose. The thread is cut off in such a manner that the free end thereof can be drawn through the shed and extends just across the weaving width. Under certain circumstances, the thread even extends slightly over at the other side.
  • Known cutting means are, for example, scissors which are mounted close to the edge of the fabric, these scissors being stationary and comprising only movable blades.
  • the scissors are withdrawn.
  • a natural selvage is not produced and special means must be provided for embedding the weft thread ends; the known embedded or turned edges are thus formed.
  • the weft threads on the finished fabric are subsequently cut off, by means of scissors, between the fabric proper and the turned threads.
  • the problems are similar when inserting the weft thread by means of gripper systems where the grippers are mounted on bands, rods and the like, which are adapted to be advanced and retracted. If it is intended to insert a single weft thread, the free weft thread end is conventionally drawn through the shed so that it terminates on the opposite side. During the second Weft operation, a U-shaped loop is customarily formed. In a known arrangement the gripper point or tip which has the function of grasping and inserting the weft thread is so designed that the weft thread breaks or is torn off at the gripper point or tip. The torn-off end of the first weft operation is placed between the first warp threads in a U-shaped or hookshaped manner.
  • FIGURE 1 is a view in elevation of one embodiment of the weft thread-cutting mechanism of the present invention
  • FIGURE 2 is a view of the mechanism of FIGURE 1 looking in the direction of arrow A in FIGURE 1,
  • FIGURE 3 is a sectional view, in an enlarged scale, through the fixed and movable jaws of the weft threadcutting mechanism taken on line B-B of FIGURE 1,
  • FIGURES 4, 5, and 6 illustrate the fixed and movable jaws of the weft thread-cutting mechanism with a pressing finger additionally mounted on the movable jaw, and
  • FIGURE 7 is a sectional view of a fabric showing the combined action of the aforementioned elements.
  • the weft thread inserting device includes an arm 1 which has a curved shape, in the embodiment shown in FIGURE 1, and is rotatably mounted on the shaft 2. Opposite to the arm 1 is the extension 11 which has a cam follower roller 12 thereon, which latter engages with the r 3 cam surface of a cam plate 20.
  • the cam plate 20 is driven by the shaft 21, which latter is coupled with the loom drive and also with the weft thread-inserting device, in a manner not shown, so that the arm 1 has a swing ing movement toward the shed imparted thereto after each weft thread insertion.
  • a spring 15 secured at 16 to the arm 1 serves to return the arm to its original position. The lateral coordination of the swinging movement of the arm with the movements of the weft thread-inserting device and the weaving batten or sley 19, shown in phantom in FIGURE 1, is thus assured.
  • the arm has, at the end thereof, two jaws 3 and 4.
  • the lower jaw 3 is fixed and is rigidly mounted on the arm 1.
  • the upper jaw 4, on the other hand, is movable and rotatable about the axle or pin 5.
  • This movable jaw 4, together with the arm 6, constitutes a toggle or angle lever, the lever arm 6 being constructed as a laminated spring and carrying a cam follower roller 7 which engages a cam surface on the cam plate 8.
  • the profile of cam 8, through roller 7 and arm 6 causes jaw 4 to move to the closed or cutting position and also allows the jaw to return to the open position.
  • the return of the movable jaw 4 is effected by means of the return spring 9.
  • the cam plate 8 is rigidly connected with a disc or plate 10, for example by means of the bolts 23 or other similar elements, and the disc or plate 10, in turn, is rigidly mounted on the shaft 2 by means of a screw 22 or other equivalent means.
  • the shaft 2 also is coupled with the loom drive so that the cam plate 8, being driven by the shaft 2, will continuously rotate.
  • the cam plate is mounted coaxially with respect to the axis of oscillation of the arm 1.
  • the movements of the movable jaw 4, which are controlled by the cam plate 8, are so coordinated to the swinging movement of the arm 1 that the latter will pass into the shed between the warp threads 17 and 18, in one of the end positions of the oscillating movement, as has been shown in phantom dashed-dotted lines in FIGURE 1.
  • FIGURE 3 illustrates, at a and b, in cross-section, two different configurations of the tips of the jaws 3 and 4, in an enlarged scale.
  • the stationary jaw 3 has a fiat upper surface 13.
  • the oppositely-positioned movable jaw 4 has a wedge shape and, for example, the faces 14 may provide a wedge-like configuration having an angle of 90 between them.
  • the apex of the wedge is not constituted as a cutting edge but, instead, is rounded off.
  • the weft thread is not cut off as with scissors but is clamped in and thereby severed.
  • the jaws also may have other configurations and it is essential only that the flat portion and the wedge shaped portion are pressed upon one another in a manner such that no gaps exist between them.
  • the two jaws 3 and 4 are, in each case, no wider than one scissor element would need be but, since they are not positioned side-by-side but rather superimposed flush with respect to each other, a con siderable reduction in width is achieved. They satisfy all requirements with regard to the strength thereof. Due to the fact that the two jaws 3 and 4 are superimposed in a manner so that there are no gaps, the weft thread can not slip away, and, accordingly, a faultless severing of.
  • the weft thread is effected at all times.
  • the pressing finger 24 is secured to the side of the movable jaw 4, for example by means of a machine screw 25.
  • the finger preferably is provided as a small flat plate and is so mounted that it is adapted to be inserted into the shed and, with the edge thereof, press the cutoff end of the weft thread into the corner geing formed by the upper and lower shed.
  • the distance between the movable jaw 4 and the pressing finger 24 may be adjusted, for example by the use of spacer members 28 of varying length.
  • the movable jaw 4, as well as the pressing finger 24 remain either completely or at least substantially outside of the shed.
  • the weft thread 27 proceeds in its course in the shed, formed 'by the warp threads 17 and 18, respectively, without encountering any obstacles.
  • the jaws 3 and 4 are closed as shown in FIGURE 6.
  • the point or tip of the pressing finger 24 will then laterally project beyond the tip of the stationary jaw 3.
  • the weft thread is severed, in the manner described above, by the jaws 3 and 4 and the short bent-over end 27 of the weft thread is thereby pressed, by the pressing finger 24, against the preceding weft threads,
  • FIGURE 7 It is apparent from FIGURE 7 how the jaws 3 and 4 are inserted between the warp threads 17 and there sever the weft thread.
  • a weft thread-cutting device of the type described herein may, of course, be mounted on both edges of the fabric and may be axially displaceable, if desired in conjunction with other structural elements of the loom, for example with the temple, in a manner such that a coordination and adaptation to different widths of fabric is made possible thereby.
  • the width of the desired weaving border may be adjusted, in the same manner, by a lateral displacement of the weft thread-cutting mechanism as required in a particular case.
  • the cut-off and bent-over weft thread ends are equally long at all times and are neatly and evenly embedded between the warp threads so that a flawless selvage is formed.
  • a weft thread-cutting mechanism for a shuttleless loom which comprises an arm pivotally mounted on a supporting shaft and having a fixed and a movable jaw at one end thereof, means for oscillating the arm so that the jaws are inserted between and retracted from between warp threads of a shed, and means for closing the movable jaw on the fixed jaw while the latter are between warp threads, whereby a weft thread between the jaws is severed.
  • a weft thread-cutting mechanism in which the movable jaw is a part of an angle lever which is rotatably mounted on the arm, and including cam means for actuating the movable jaw.
  • a weft thread-cutting mechanism in which one part of the angle lever has a cam follower at the end thereof, said latter part of the lever being a laminated spring.
  • a weft thread-cutting mechanism in which the cam means for actuating the movable jaw rotates coaxially with the axis of oscillation of the arm.
  • a weft thread-cutting mechanism in which the fixed jaw has a fiat weft thread-engaging surface and the movable jaw has a Weft thread-engaging surface in the shape of a rounded off wedge.
  • a weft thread-cutting mechanism according to claim 1 in which the means for oscillating the arm includes cam means.
  • a weft thread-cutting mechanism in which the arm is mounted on the supporting shaft in an axially displaceable manner.
  • a weft thread-cutting mechanism in which the movable jaw has means mounted thereon for pressing a severed weft thread end against finished fabric.
  • a weft thread-cutting mechanism in which the means mounted on the movable jaw for pressing a severed weft thread end against finished fabric is a substantially flat depending plate.
  • a weft thread-cutting mechanism including means for adjustably mounting the plate on the movable jaw, whereby the distance between them can be varied.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US514069A 1965-01-23 1965-12-15 Weft thread-cutting mechanism for shuttleless looms Expired - Lifetime US3347282A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0049794 1965-01-23

Publications (1)

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US3347282A true US3347282A (en) 1967-10-17

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US514069A Expired - Lifetime US3347282A (en) 1965-01-23 1965-12-15 Weft thread-cutting mechanism for shuttleless looms

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US (1) US3347282A (US08080257-20111220-C00005.png)
BE (1) BE673496A (US08080257-20111220-C00005.png)
CH (1) CH431413A (US08080257-20111220-C00005.png)
FR (1) FR1463251A (US08080257-20111220-C00005.png)
GB (1) GB1077809A (US08080257-20111220-C00005.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610292A (en) * 1969-02-28 1971-10-05 Fischer Ag Georg Device to form a cloth selvage with tucked-in filling ends on a weaving machine
JPS5071964A (US08080257-20111220-C00005.png) * 1973-11-02 1975-06-14
US4387744A (en) * 1981-04-01 1983-06-14 Burlington Industries, Inc. Thread severing mechanism associated with shuttleless loom
US4540028A (en) * 1982-11-24 1985-09-10 Lindauer Dornier Gesellschaft Mbh Shuttleless weaving machine with gripper systems for the filling yarn insertion into and retraction from the shed
BE1021989B1 (nl) * 2014-07-15 2016-02-02 Picanol Inslagschaar voor een weefmachine.
US10011455B2 (en) * 2013-10-25 2018-07-03 Columbia Insurance Company Cutter assembly for stretched yarn

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1273168B (it) * 1994-04-29 1997-07-07 Panter Srl Dispositivo di taglio di trama per una macchina per tessere

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR808755A (fr) * 1935-10-31 1937-02-15 Perfectionnements aux métiers à tisser à alimentation continue de trame par bobines fixes
US3090405A (en) * 1958-06-04 1963-05-21 Dewas Raymond Process for the formation of selvedges on looms
US3198216A (en) * 1962-07-25 1965-08-03 Brelic Internat Inc Weft thread cutting device for shuttleless looms

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR808755A (fr) * 1935-10-31 1937-02-15 Perfectionnements aux métiers à tisser à alimentation continue de trame par bobines fixes
US3090405A (en) * 1958-06-04 1963-05-21 Dewas Raymond Process for the formation of selvedges on looms
US3198216A (en) * 1962-07-25 1965-08-03 Brelic Internat Inc Weft thread cutting device for shuttleless looms

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610292A (en) * 1969-02-28 1971-10-05 Fischer Ag Georg Device to form a cloth selvage with tucked-in filling ends on a weaving machine
JPS5071964A (US08080257-20111220-C00005.png) * 1973-11-02 1975-06-14
JPS5433309B2 (US08080257-20111220-C00005.png) * 1973-11-02 1979-10-19
US4387744A (en) * 1981-04-01 1983-06-14 Burlington Industries, Inc. Thread severing mechanism associated with shuttleless loom
US4540028A (en) * 1982-11-24 1985-09-10 Lindauer Dornier Gesellschaft Mbh Shuttleless weaving machine with gripper systems for the filling yarn insertion into and retraction from the shed
US10011455B2 (en) * 2013-10-25 2018-07-03 Columbia Insurance Company Cutter assembly for stretched yarn
BE1021989B1 (nl) * 2014-07-15 2016-02-02 Picanol Inslagschaar voor een weefmachine.

Also Published As

Publication number Publication date
DE1535493A1 (de) 1972-03-30
FR1463251A (fr) 1966-12-23
GB1077809A (en) 1967-08-02
BE673496A (US08080257-20111220-C00005.png) 1966-04-01
CH431413A (de) 1967-02-28

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