US3208481A - Apparatus for monitoring the available weft thread supply from shuttle means in a loom - Google Patents

Apparatus for monitoring the available weft thread supply from shuttle means in a loom Download PDF

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Publication number
US3208481A
US3208481A US243696A US24369662A US3208481A US 3208481 A US3208481 A US 3208481A US 243696 A US243696 A US 243696A US 24369662 A US24369662 A US 24369662A US 3208481 A US3208481 A US 3208481A
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reflecting
spool
light
shuttle
weft thread
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US243696A
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English (en)
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Muller Jakob
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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

Definitions

  • a monitoring device continuously checking on the available weft thread supply would have to give a signal so that the loom may be stopped and in the first case a new spool with a new supply of thread inserted, while in the second case the ends of the broken thread would have to be tied together.
  • the monitoring device furnishes a signal somewhat before the available supply of thread on the spool is completely exhausted.
  • photo-electric means namely a source of light directing a beam of light to a selected area of the loom where ordinarily during operation thread furnished by the thread supply is present, and photoresponsive indicator means exposed to said beam of light when no thread is present in the above mentioned area whereby an indication is obtained that under these circumstances no thread supply is available for opertaion.
  • the invention includes an apparatus for monitoring the available weft thread supply from shuttle means in a loom, particularly in a ribbon weaving loom, comprising, in combination, a stationary source of light projecting a beam of light toward the path of the shuttle means so that during the movements of said shuttle said beam of light impinges in at least one position of said shuttle means along said path on a predetrmined area of said shuttle means where weft thread is normally present during operation; at least one reflecting member arranged to be movable between differently orientated positions on said shuttle means in such a manner that in at least one of said positions of said shuttle means and of said reflecting member said light beam is reflected thereby when the available weft thread supply from said shuttle means is reduced to a predetermined minimum, which minimum may include zero, said reflecting member having at least two distinct reflecting faces, each reflecting in a different particular position of said shuttle means and of said reflecting mem ber rays of light of said beam thereof in a predetermined direction, respectively; and light-responsive indicator means arranged station
  • FIGS. 17 illustrate a weft thread spool shaped in accordance with the invention for being used as a reflector member
  • FIG. 1 being an elevation of a spool according to the invention
  • FIGS. 24 being cross-sectional end views illustrating three different cross-sectional forms of the spool according to FIG. 1, the section taken along the line AA of FIG. 1;
  • FIG. 5 is an elevation of a spool according to the invention showing a modification of the cross-sectional form according to FIG. 2;
  • FIG. 6 is a cross-sectional end view of the spool according to FIG. 5, the section being taken along the line
  • FIG. 7 is a elevtaion of a spool showing a further modification of its reflecting surface
  • FIG. 8 is a partly sectional elevation of a conventional monitoring apparatus with a spool and other reflector means which may be modified in accordance with the invention.
  • FIG. 9 is a plan view of the main portion of the arrangement according to FIG. 8.
  • FIGS. 10a, 10b; 11a, 11b; 12a, 12b; and 13a, 13b illustrate diagrammatically and respectively in front and side views several embodiments of a reflector member according to the invention.
  • FIGS. 8 and 9 In order to facilitate the understanding of the present invention, the overall arrangement according to FIGS. 8 and 9 will be described first.
  • FIGS. 8 and 9 the shuttle 22 of a ribbon weaving loom is shown having a base portion arranged for sliding movement between guides 23 and 24 of a portion 25 of the loom.
  • the shuttle 22 has an arched portion 21 in which a spool 9 may be held as shown by being supported by a rod 10 which is insertable into the shuttle.
  • the weft thread carried by the spool is pulled off the spool and guided through guide rings 12, 13, 14 and 15 arranged in a conventional manner as shown in FIG. 9 and from there through a guide sleeve 16 where it leaves the shuttle.
  • a photo-electric unit 27 of conventional design is mounted stationarily on a portion 26 of the loom and contains a source of light directing a beam of light along line 8 toward the path of the shuttle 22 and more specifically toward the path of the spool 9 carried by the shuttle 22.
  • the outer surface of the spool 9 is provided with a light reflecting surface so that during operation, when the innermost layer of thread is at least partly removed from the spool the light beam 8 will be reflected by the reflecting outer surface of the spool 9, at least in that position of the shuttle in which the reflecting portion of the spool surface is located across the beam 8, along line 8 toward a conventional light responsive indicator in the unit 27.
  • This indicator would indicate in any conventional manner, e.g.
  • a reflector member e.g. a small mirror 17 carried by a flexible or tiltable wire 18 is so mounted in the arched portion 21 of the shuttle 22 that the wire 18 normally rests on a portion of the thread extended between the guide rings 14 and so as to be held by the tensioned thread in an idle position shown in full lines in FIG. 1 so that the mirror 17 does not extend across the incoming light beam 8 or the reflected light beam 8'.
  • the tension of the thread between the rings 14 and 15 vanishes and the mirror 17 moves into a second position shown in dotted lines in FIG. 8, namely so as to extend across the beam 8.
  • the wire 18 forms, therefore, a means preventing the mirror 17 to move from its idle position to its second posiiton, i.e. to a position in which the light beam 8 impinges on the mirror, as long as a thread supply is available, but permitting the mirror to move to the second position if the thread breaks. Under these conditions the beam 8 will be reflected again in the direction of the line 8' by the mirror 17 so that again the indicator device in the unit 27 would indicate that at this moment there is no weft thread supply available for the loom.
  • the reflection of the incoming beam 8 by the conventional reflector members of the above described arrangement is of comparatively low efficiency. It is to be borne in mind that during opera tion of the loom, the shuttle is in continuous movement so that the reflecting surface of the reflecting member which may be either the spool surface or the mirror 17 traverses the beam 8 only once with every stroke of the shuttle so that the beam 8 will be reflected in the direction 8' only for an extremely brief moment.
  • the reflecting surface of the spool 9 has the conventional cylindrical shape, the light rays in the beam along line 8 will be reflected by the cylindrical reflecting surface in a diffuse manner and theoretically only one ray which impinges exactly in radial direction on the cylindrical surface will be reflected in the direction 8'.
  • the reflecting member in the shuttle is constructed to have at least two distinct reflecting faces, each reflecting in a different particular position of said shuttle means and of the reflecting member rays of light of the incoming beam in a predetermined direction, respectively, namely in the direction of the line 8.
  • FIGS. 1-7 a reflecting member is illustrated which constitutes or is constituted by the above mentioned weft thread spool.
  • the spool 1 is provided with end flanges 2 and 2 and with an axial bore 3 adapted to receive the above mentioned support rod or axle 10.
  • the body of the spool 1 has a cross section providing along the circumference of the spool 1 at least two distinct reflecting faces.
  • the cross-section of the spool body is hexagonal so that in circumferential direction six distinct plane reflecting faces 4 are provided.
  • the individual distinct reflecting faces 4 of the spool are concave so that in addition to the above described effect, the rays of light impinging on a face 4 are concentrated upon their reflection toward the line 8 whereby the intensity of the reflected beam upon arrival at the unit 27 is increased.
  • the concave shape of the faces 4 may be cylindrical, elliptical, or hyperbolical with similar effect.
  • the individual faces 4 of the spool may also be made convex.
  • a concentrated reflection of the beam 8 occurs when the latter impinges on that area of the reflecting surface of the spool where two adjoining convex faces 4" meet slnce this area constitutes a groove with inclined lateral portions which act similarly as the concave faces 4'.
  • the etficiency f the reflection of light by the surface of a spool as described above can be increased still more if, according to FIGS. 5 and 6, the body of the spool is formed not as a straight prism with cross-sections, e.g. according to FIGS. 2-4, but is subdivided into portions 5, 5' and 6, each having one of the above described crosssections, the center portion 6 being however angularly offset against the portions 5 and 5 by 30 in the particular case where the cross-section is essentially a hexagon.
  • FIG. 7 illustrates the outer surface of a spool showing a reflecting surface composed of a great number of small facets 7 which can be produced for instance by the well known hammering process.
  • the individual facets may be either plane, concave or convex.
  • the relative position of the individual facets with respect to the neighboring facets can be chosen in any desirable manner, and between the individual facets there may be left surface portions which are not light reflecting.
  • the characteristic arrangement illustrated thereby may be further modified in such a manner that the polygonal cross-sections of the portions 5, 5 and 6 may differ from each other.
  • one portion may have hexagonal and another portion may have octagonal cross-section.
  • the number of distinct faces following each other in circumferential direction at any cross-section of the spool may be varied as desired.
  • the cross-section according to FIG. 4 may be so modified that, for instance, three convex faces 4" are combined with three concave faces 4' respectively arranged between the convex faces.
  • FIGS. 10-13 illustrate by way of example such embodiments of the invention wherein the mirror 17 is provided with at least two distinct reflecting faces analogous to those described above in reference to FIGS. 2, 3, 4 and 7.
  • FIGS. 10a, and 10b show respectively in a front view and a side view a mirror 17 having three angularly displaced reflecting faces 17a which are substantially plane.
  • FIGS. 11a, and 1 lb illustrate a mirror 17 in which the reflecting faces 17b are concavely curved, whereas the reflecting faces of the mirror 17" illustrated in the FIGS.
  • FIGS. 13a and 13b illustrate a mirror 17" which has a reflecting surface composed of a great number of small facets 17d which can be produced for instance by the well known hammering process.
  • the individual facets 17d of the mirror 17" may be either plane, concave or convex.
  • the reflecting member or a multitude of it may also be trans-parent, so that the beam of light can be reflected by its inner faces as well as by the outer ones, in a way of refraction of light inside the body of the reflecting member.
  • said one reflecting means is formed at least partly as -a polygonal prism the sides of which constitute said distinct re flecting surfaces.
  • said one reflecting means is composed of at least two portions of said spool, each formed as a polygonal prism and coaxial with the other portion, one portion being angularly offset against the other relative to the common axis thereof.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US243696A 1961-11-27 1962-11-26 Apparatus for monitoring the available weft thread supply from shuttle means in a loom Expired - Lifetime US3208481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1379261A CH396802A (de) 1961-11-27 1961-11-27 Fotoelektrischer Schussfadenwächter für Bandwebstühle

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US3208481A true US3208481A (en) 1965-09-28

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US243696A Expired - Lifetime US3208481A (en) 1961-11-27 1962-11-26 Apparatus for monitoring the available weft thread supply from shuttle means in a loom
US339528A Expired - Lifetime US3241789A (en) 1961-11-27 1964-01-22 Thread spool and reflecting member for apparatus for monitoring the thread supply of a loom

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US339528A Expired - Lifetime US3241789A (en) 1961-11-27 1964-01-22 Thread spool and reflecting member for apparatus for monitoring the thread supply of a loom

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CH (1) CH396802A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50100367A (de) * 1973-07-27 1975-08-08

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432171A (en) * 1945-06-30 1947-12-09 Crompton & Knowles Loom Works Weft detecting system for looms
US2522101A (en) * 1948-04-29 1950-09-12 Crompton & Knowles Loom Works Photoelectric weft detector for looms
DE850730C (de) * 1950-04-28 1952-09-29 H E Schniewind Fa Fotoelektrischer Schussfadenwaechter
US2971695A (en) * 1957-12-23 1961-02-14 Sick Erwin Photoelectric apparatus
US3034743A (en) * 1960-02-25 1962-05-15 Du Pont Circumferentially grooved, longitudinally striped bobbin
US3045945A (en) * 1958-01-20 1962-07-24 Sonoco Products Co Textile yarn carrier having crowned winding surface
US3053139A (en) * 1959-05-25 1962-09-11 Loepfe Erich Electro-optical weft feeler for looms
US3053137A (en) * 1955-03-24 1962-09-11 Loepfe Ag Geb Electro-optical apparatus for sensing in counting, regulating, and control systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH228412A (de) * 1942-09-30 1943-08-31 Richter Georg Spule für Automatenwebschützen.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432171A (en) * 1945-06-30 1947-12-09 Crompton & Knowles Loom Works Weft detecting system for looms
US2522101A (en) * 1948-04-29 1950-09-12 Crompton & Knowles Loom Works Photoelectric weft detector for looms
DE850730C (de) * 1950-04-28 1952-09-29 H E Schniewind Fa Fotoelektrischer Schussfadenwaechter
US3053137A (en) * 1955-03-24 1962-09-11 Loepfe Ag Geb Electro-optical apparatus for sensing in counting, regulating, and control systems
US2971695A (en) * 1957-12-23 1961-02-14 Sick Erwin Photoelectric apparatus
US3045945A (en) * 1958-01-20 1962-07-24 Sonoco Products Co Textile yarn carrier having crowned winding surface
US3053139A (en) * 1959-05-25 1962-09-11 Loepfe Erich Electro-optical weft feeler for looms
US3034743A (en) * 1960-02-25 1962-05-15 Du Pont Circumferentially grooved, longitudinally striped bobbin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50100367A (de) * 1973-07-27 1975-08-08

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Publication number Publication date
CH396802A (de) 1965-07-31
US3241789A (en) 1966-03-22

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