US3720238A - Arrangement for monitoring weft threads - Google Patents

Arrangement for monitoring weft threads Download PDF

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Publication number
US3720238A
US3720238A US00149700A US3720238DA US3720238A US 3720238 A US3720238 A US 3720238A US 00149700 A US00149700 A US 00149700A US 3720238D A US3720238D A US 3720238DA US 3720238 A US3720238 A US 3720238A
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US
United States
Prior art keywords
thread
weft
shuttles
monitoring
arrangement
Prior art date
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
Application number
US00149700A
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English (en)
Inventor
E Strauss
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.)
Ruti Machinery Works Ltd
Maschinenfabrik Rueti AG
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Maschinenfabrik Rueti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Rueti AG filed Critical Maschinenfabrik Rueti AG
Application granted granted Critical
Publication of US3720238A publication Critical patent/US3720238A/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J5/00—Shuttles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J2700/00—Auxiliary apparatus associated with looms; Weavening combined with other operations; Shuttles
    • D03J2700/10—Shuttles
    • D03J2700/14—Gripper shuttles
    • D03J2700/16—Gripper shuttles with warp or weft stop motion

Definitions

  • the present invention relates to an arrangement, on a wave-type loom, for monitoring the condition of the weft threads during their insertion into a shed by means of an insertion element which during its insertion movement is guided loosely in a guide means, i.e. is guided in a resilient manner or with play between it and the guide means, to provide for a change in position of the insertion element to be detected by an associated monitoring means thereby evidencing the presence of an unwanted defect in weft thread condition.
  • weft threads are detected directly. This detection can be carried out mechanically or by optical means. In the mechanical detection of the weft thread, the position of the thread is interfered with and this can lead to streaking of the finished fabric. In the optical detection of the thread, sensitive equipment is necessary because of the smallness of the thread. The equipment is thus rendered expensive if it is to be sufliciently reliable and durable.
  • a mirror occupies one position when a weft thread is present and another different position when the thread is not present.
  • the one or other position of the mirror is determined by means of a light-source and a photoelectric cell.
  • the present invention is intended to avoid these disadvantages and it is characterized in that the difference, occurring at a monitoring point, between the position of an insertion element when a weft thread is loose or broken and the position of said element when operation is proceeding in the proper manner serves as a criterion for detecting the condition of the weft thread, i.e. the presence of a loose or broken weft thread carried by the said insertion element.
  • FIG. 1 is a schematic illustration which shows that part of a loom forming a wave-type shed in which the weft-thread insertion elements emerge from the warp threads;
  • FIG. 2 is a schematic view taken along line I I-II of FIG. 1 and showing a light ray emitting arrangement.
  • the weft-thread inserting elements or shuttles 11, 12, and 13 move between warp threads 14 from right to left (see FIG. 1).
  • the warp threads 14 are caused to form sheds, and the shed opening is greatest at the point where the tip or leading edge of each inserting element 12 and 13' is located, and a shed-change takes place between each two inserting elements or shuttles, e.g. between the shuttles 12 and 13..
  • the sheds move from right to left at the same speed as the shuttles.
  • the heddles 15 have been omitted from FIG. 1 for greater clarity.
  • the woven material is designated by the numeral 19.
  • the shuttles 11, 12 and 13 are carried and driven by the reeds 16.
  • a large number of the reeds 16 are arranged side-by-side.
  • the reeds 6 impart drive to the shuttles 11, 12 and 13 by moving upwards one after the other, as is the case in the zones 17.
  • they strike the inclined trailing edges 18 of the shuttles 11, 12 and 13, so that the latter are driven to the left (see FIG. 1).
  • the shuttles 12 and 13 cannot deflect upwardly since they are retained by the warp threads 14 as can be clearly seen from FIG. 2. Since lateral deflection of the insertion elements 12 and 13 is also prevented by the warp threads 14, the latter form a resilient guide means for the elements 12 and 13.
  • the reeds 16 likewise execute an undulatory movement (which progresses from right to left.
  • each shuttle 11, 12 and 13 Prior to entry into its shed, there is passed to each shuttle 11, 12 and 13 a portion of weft thread of a length which approximately corresponds to the width of the fabric being woven and is such that a short end portion of the weft thread will yet project from the left-hand side of the fabric.
  • the portions of weft thread are brought into each of the shuttles 11, 12 and 13, and while the shuttles are passing over the width of the fabric in the shed, said portions of weft thread are drawn from the rear or trailing ends of the shuttles.
  • the weft threads running out of the shuttles 11, 12 and 13 is designated in each case by the numeral 20.
  • the guide elements 21 are broad-faced elements which are arranged at right-angles to the plane of the drawing of FIG. 1 and which contain openings which are similar to but slightly greater than the greatest crosssection of the weft inserting elements 11, 12 and 13. The inserting elements are thus guided by the guide elements 21, there being certain clearance between the shuttles and said guide elements.
  • a special or detectable portion or means in the form of a ray reflective means or reflector 22 is provided at the rear part of each shuttle 11, 12 and 13.
  • the reflectors are respectively positioned in the outwardly facing side-wall of each shuttle and each of the reflectors 22 comprises a recess in the side-wall of the shuttle into which a ray reflecting material has been bonded.
  • a lightrays emitting arrangement or unit 23, shown only in FIG. 2, is provided to cooperate with the reflectors 22.
  • Unit 23 which is adapted to monitor light rays received from reflectors 22, includes a lamp 24 that provides for a light-beam emitted therefrom to pass through a semitranslucent plate 25 and a lens 26, into a path of the shuttles and be reflected by a reflector 22 so as to again pass through the lens 26 onto the plate 25. A part of the reflected light-beam from this plate is directed thereby to fall on the photo-electric cell 27 and is recorded by the cell.
  • Such optical arrangements are known per so.
  • the shuttles 11, 12 and 13 move continuously from right to left in the arrangement shown in FIG. 1. They are continuously driven by the undulatory movement of the reeds 16.
  • the warp threads 14 form sheds which likewise move from right to left and which have their greatest opening at the point where the leading edge or foremost portion of each shuttle is located.
  • the warp threads 14 have already begun to move into their countershed positions.
  • the shuttles 11, 12 and 13 are thus sup ported for movement in the sheds.
  • Each of the Weft threads 20 emerging from the rear part of the shuttles 11, 12 and 13 during their insertion movement passes through a thread brake (not shown) provided in each of the shuttles and passes from said brake to the edge of the fabric or the top 30 of the shed, where it is beaten up by the reeds 16 and is woven into the fabric by the shed-change that takes place at the same time. At this moment the weft thread is held fast.
  • a thread brake not shown
  • the shuttles 11, 12 and 13 are pressed more firmly against the holding point provided by the warp threads 14 and against the beat-up zone or edge 30. Since the warp threads 14 are able to yield, the trailing or rear part of each of the shuttles 1-1, 12 and 13, in particular is lifted to a greater extent than if this tensile force were not present.
  • the position of the shuttles or weft thread inserting elements 11, 12 and 13 is therefore different depending upon whether or not a weft thread 20 is running from these elements and is being woven into the fabric. These differences in the position provide a criterion for determing whether a loose or broken weft thread is present by detecting a change of position of the shuttle in which such condition may occur.
  • the shuttle 12 is indicated in a shuttle position .12, designated in broken lines which represents the position occupied by shuttle 12 when the thread 20 is defective, i.e. broken, while the shuttle 12, as shown in solid lines, occupies the position for when operations are proceeding in a proper manner.
  • the monitoring means comprising the unit 23, can be fitted at any point along the path taken by the shuttles 11, 12 and 13, e.g. at the points 3 1, 32 or 33. Several such monitoring points could also be provided along this path. If the monitoring point is located at the position where the shuttles emerge from the warp threads 14, this offers the advantage that control can be exercised over the entire weaving width, since there is hardly any likelihood that a thread, broken at the beginning of the path travelled by the shuttles 11, 12 and 13, would again come to be correctly woven-in at the end of this path.
  • the unit 23 provides a light ray source detecting or monitoring means that emits rays to at least one specific monitoring point along the path of travel of the weft thread inserting means or elements.
  • monitoring means is positioned so as to be directed towards a monitoring point for said inserting means located at a position where the inserting means run out of the warp threads in the area of the outermost warp threads thereof.
  • said detectable means is a ray reflective means operatively connected thereto and said monitoring means is a ray source detecting means that emits rays to at least one specific monitoring point along a path of travel of said inserting means whereby, when said thread in said inserting means is not under tensile force, said reflective means is moved to a position along a path of travel of said inserting means which permits the reflective means to intercept a point of emitted rays for detection of a loose or broken thread carried by said inserting means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00149700A 1970-06-12 1971-06-03 Arrangement for monitoring weft threads Expired - Lifetime US3720238A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH888370A CH516672A (de) 1970-06-12 1970-06-12 Anordnung zum Überwachen der Schussfäden einer Wellenfachwebmaschine

Publications (1)

Publication Number Publication Date
US3720238A true US3720238A (en) 1973-03-13

Family

ID=4345818

Family Applications (1)

Application Number Title Priority Date Filing Date
US00149700A Expired - Lifetime US3720238A (en) 1970-06-12 1971-06-03 Arrangement for monitoring weft threads

Country Status (8)

Country Link
US (1) US3720238A (enExample)
JP (1) JPS5131866B1 (enExample)
BE (1) BE768412A (enExample)
CA (1) CA932618A (enExample)
CH (1) CH516672A (enExample)
CS (1) CS161905B2 (enExample)
FR (1) FR2095203B1 (enExample)
GB (1) GB1350992A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS213601B1 (en) * 1980-04-08 1982-04-09 Otakar Novotny Optoelectronic scanner with adapter of signal for the control of weft of the multished weaving machine with rippled weft
IT1232962B (it) * 1987-11-20 1992-03-11 Nuovo Pignone Spa Sistema di rilevamento istantaneo della rottura di un filo di trama nella bocca di ordito di un telaio multifase.

Also Published As

Publication number Publication date
CH516672A (de) 1971-12-15
JPS5131866B1 (enExample) 1976-09-09
DE2127614B2 (de) 1976-04-29
CS161905B2 (enExample) 1975-06-10
DE2127614A1 (de) 1971-12-16
FR2095203A1 (enExample) 1972-02-11
FR2095203B1 (enExample) 1974-03-22
GB1350992A (en) 1974-04-24
CA932618A (en) 1973-08-28
BE768412A (fr) 1971-11-03

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