US3533451A - Tread clamping device for weaving machines - Google Patents

Tread clamping device for weaving machines Download PDF

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Publication number
US3533451A
US3533451A US765440A US3533451DA US3533451A US 3533451 A US3533451 A US 3533451A US 765440 A US765440 A US 765440A US 3533451D A US3533451D A US 3533451DA US 3533451 A US3533451 A US 3533451A
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US
United States
Prior art keywords
weft
thread
clamping device
clamping
springs
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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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US765440A
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English (en)
Inventor
Johann Stingl
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Georg Fischer AG
Original Assignee
Georg Fischer AG
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Filing date
Publication date
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Publication of US3533451A publication Critical patent/US3533451A/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms

Definitions

  • the present invention relates to a thread clamping device for weft thread or threads for use in a weaving machine with weft thread supply cones located outside the shed which weft threads are inserted into the shed of a fabric being woven by carriers or other means for the purpose.
  • the thread clamping means is characterized in that for each thread it comprises two leaf springs that face each other and are movable to and from an open position into a clamping position and which have overlapping portions of considerable area. Weft thread guides restrain the wefts to run through the clamps only at the overlapping areas. These leaf springs are fixed in support means, one of which is movable relatively to the other so that the overlapping portions engage in the clamping position so as to provide a clamping action and lock the thread against movement, but when opened, free it to impose no drag on it.
  • FIG. I is a diagrammatic view of the weft insertion principle, also showing the clamp as shown in plan;
  • FIG. 2 is a sectional view of an open thread clamping device according to this invention.
  • FIG. 3 is a similar view of the clamping device according to this invention in closed position
  • FIG. 4 is an elevation of a thread clamping device according to this invention designed for eight weft threads in different colors
  • FIG. 5 is a section of the thread clamping device according to FIG. 4 and taken at line A-A;
  • FIG. 6 is a view of a thread clamping device according to a modification of the invention with adjustable clamping leaves for four weft threads;
  • FIG. 7 is a section of the thread clamping device according to FIG. 6, taken at line 8-3.
  • FIG. 1 is a diagrammatic view of a principle of weft insertion to which the invention may well be applied.
  • the fabric .1 havinga right-hand selvage 2 which may preferably be a false selvage, is being woven in a loom with a slay 3, slay support 4 and a reed 5.
  • Indicated generally is a driving unit 6 with a guide 7 for the weft insertion member 8.
  • a thread pull-down member 9 which supplies the weft thread to a carrier 11 fixed at the end of a weft insertion rapier or member 8 and feeders 12 which selectively supply the weft thread coming from the cones 13 to cone covers 14 is the thread clamping device 16.
  • the cohstruction and operation of the basic loom parts here are shown in US. Pat. No. 2,641,285. From a weft thread 17 last iiiserted, the thread 10 passes via a loop 18 to the carrier lI,
  • feeder 12 which is in feeding position, and finally, extends back to the supply cone 13.
  • the said thread is cut by a thread cutting attachment 20 at the loop 18 and preferably between the maih body of the warp and the warp at the false selvage 2.
  • This lefthand carrier 19 extends the cut end to complete the pick in a known manner.
  • Driving means (not shown) force mobile clamping springs 21 against stationary clamping springs 22 of the thread clamping device 16 at this time, the weft thread ll) located between being held fast so no weft is drawn from the cone after enough for a pick has been measured.
  • FIG. 2 is a view of an open thread clamping device whibh basically comprises a stationary clamping spring 22 and a mobile clamping spring 21 and which does not necessarily requll'e parallel relationship between the clamping springs 21, 22 owing to its manner ofoperation.
  • FIG. 3 is a view of a closed thread clamping device in which, thanks to the resiliency of the clamping springs 21, 22 an accurate fit of the overlapping portion 23 is possible even after the rest position according to FIG. 3 is reached.
  • This clampitig principle enables weft threads of different counts to be clamped without any particular adjustments or preparations:
  • bracket being, in effect, an integral part of the plate.
  • Attached to the base plate 24 by means of screws 27 is a segment or rlin 28 in which the clamping springs 22 are inserted, preferably by being soldered into slots in the rim.
  • the hub supports a shaft 30 fixed by a set screw 29 on which a mobile segment hub 32 is oscillatable on needle bearings 31. It is secured against axial displacement by means of washer 33 and screw 34.
  • clamping springs 22 arerecessed in projections or sectors fixed to and projecting from hub 32.
  • a ball or other bearing 37 which laterally abuts against a spacer 38 and a washer 41 attached by means of a screw having a grooved head.
  • a positioning member or plunger 43 Guided in a bracket or holding portion 26 by guides 42 is a positioning member or plunger 43 which is moved by control units e.g. cam means (not shown) and acts. against the action of a tension spring 45 hooked into the groove 39 and about a bolt 44, on the ball bearing 37.
  • the segment moved by this plunger and spring in the directions indicated by arrow 46 and the clamping springs 21, 22 are displaced against or away from one another. Motion is limited to only a few degrees of oscillation.
  • a flat annular, segmental bar 47 is attached to the base plate 24 by means of screws 48, one at either end, and is provided with a number of eyelets 49 identical with the number of pairs of clamping springs, the weft thread 10 being passed through them between the clamping springs 21, 22 and then drawn away through eyelets 50 in the base plate'24.
  • FIG. 6 is a viewof a modification of the invention with a thread clamping device with adjustable clamping springs for four weft threads
  • FIG. 7 is a section of the same clamping means, the same clamping spring principle being applied, in this embodiment as well except that motion is rectilinear.
  • a slide guide 51 is provided with thread guide eyelets and bores 53, the later rotatably supporting bolts or pins 55 held axially by means of securing rings 54. Attached to the bolts are holders 56 with soldered-in clamping springs 57 and fixing pins 58.
  • the slide guide 51 is provided with adjusting screws 59 which actupon a right-hand and left-hand leg 60 of the holder 56 so that the clamping springs can be individually swivelled.
  • the slide guide 51 holds the slide 61 actuated in the direction of arrow 62 by driving means (not shown), e.g. by cams. It is provided with soldered-in clamping springs 63 and secured by plates 64. Slide 61 has an easy rectilinear motion in its slide channel and is moved to bring springs 68 into pressure engagement with springs 57 with the weft between when that weft is to be locked against withdrawal.
  • a member 66 equipped with eyelets 65 is firmly bolted to the slide guide 51.
  • the thread 67 passes through the eyelets 52, 65 andbetween the clamping springs 57, 63, and it may pass a variety of different counts in the embodiment of the clamping unit 68. In other words, the count, type or character of the weft makes little difference.
  • the device may be adapted to a single weft or to any reasonable plurality. It is to be noted that for multiweft work one simple motion opens all clamps and closes all. With the system herein involved wefts not being drawn are released along with the one that is, however, this only permits the inactive wefts to be extended slightly as the fabric to the selvage of which they are connected moves away. Actually, only the running weft is affected in normal patterns. Only the feeders 12 for two wefts are shown here, but there an equal number of these for the number of wefts in action. Pattern control governs the presentation of weft as desired.
  • a thread clamping device for weaving machines of the type in which weft is drawn from a supply positioned outside a shed of a fabric being woven and is inserted as a pick of weft by means moved into and from the shed characterized in that, the clamping device includes two relatively movable support means, cooperating leaf springs having overlapping ends functioning as a pair, one of which is fixed in each of said support means, guide means for the weft positioned to guide it between the overlapping portions of said leaf springs, and means to move said support means to separate said leaf springs and to press them together as the weft is to be released or locked against withdrawal from the supply.
  • means for moving said movable support means includes a plunger pressing against a part of the support means and a spring for returning the parts to the opposite position.
  • leaf springs in one said support are fixed therein, and means for adjusting the leaf springs in the other support which includes swivelable holders, one for each spring, and threaded means to adjust and retain said holders in a fixed position to which they have been adjusted.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US765440A 1967-10-06 1968-10-07 Tread clamping device for weaving machines Expired - Lifetime US3533451A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1403367A CH464105A (de) 1967-10-06 1967-10-06 Fadenklemmvorrichtung für Webmaschine

Publications (1)

Publication Number Publication Date
US3533451A true US3533451A (en) 1970-10-13

Family

ID=4397356

Family Applications (1)

Application Number Title Priority Date Filing Date
US765440A Expired - Lifetime US3533451A (en) 1967-10-06 1968-10-07 Tread clamping device for weaving machines

Country Status (6)

Country Link
US (1) US3533451A (de)
CH (1) CH464105A (de)
DE (1) DE1801017C3 (de)
ES (1) ES359208A1 (de)
FR (1) FR1583499A (de)
GB (1) GB1238320A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951718A (en) * 1987-09-02 1990-08-28 Picanol N.V. Repair of broken weft threads using plural yarn supply packages

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951718A (en) * 1987-09-02 1990-08-28 Picanol N.V. Repair of broken weft threads using plural yarn supply packages

Also Published As

Publication number Publication date
FR1583499A (de) 1969-10-31
CH464105A (de) 1968-10-15
GB1238320A (de) 1971-07-07
DE1801017C3 (de) 1973-12-06
DE1801017B2 (de) 1973-05-03
DE1801017A1 (de) 1969-10-16
ES359208A1 (es) 1970-06-01

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