US3324897A - Slide valve controlled pneumatic weft holding device - Google Patents

Slide valve controlled pneumatic weft holding device Download PDF

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Publication number
US3324897A
US3324897A US456724A US45672465A US3324897A US 3324897 A US3324897 A US 3324897A US 456724 A US456724 A US 456724A US 45672465 A US45672465 A US 45672465A US 3324897 A US3324897 A US 3324897A
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United States
Prior art keywords
openings
distributor chamber
drop box
slide valve
lay
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
US456724A
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English (en)
Inventor
Rainer Walter
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.)
Saurer AG
Original Assignee
Adolph Saurer AG
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Filing date
Publication date
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Publication of US3324897A publication Critical patent/US3324897A/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D45/00—Looms with automatic weft replenishment
    • D03D45/50—Cutting, holding, manipulating, or disposing of, weft ends
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D43/00—Looms with change-boxes

Definitions

  • This invention relates to looms, and more particularly to weft holding means for use on drop box looms and the like.
  • a promising approach to a solution of this problem 1s provided by the present invention in a pneumatic devlce which includes suction ports disposed in the shuttle compartments on the side of the box facing the lay, and wherein the conduits leading to the individual ports originated at individual openings are arranged in a vacuum distribution chamber.
  • This pneumatic device is designed to maintain the wcfts extending from the shuttle compartments to the web, under tension, so that a mutual entanglement of the wefts in this region is effectively avoided. While on the whole satisfactory, this arrangement suffers from the disadvantage that inasmuch as the suction effect is imparted to and maintained at all the suction ports at all times, a very material suction output is required which can be delivered only by a powerful and hence, costly, vacuum pump.
  • the present invention contemplates providing the vacuum distribution chamber of a shuttle changing drop box loom with a distributor valve arranged in said chamber for displacement relative thereto, and designed to close certain openings of the distributor chamber in accordance with the position of the drop box relative to the plane of the lay.
  • the invention is based on the discovery that without impairing in the least the efiiciency of the pneumatic system, some of the suction ports on the drop box may be closed, so as to afford a very material saving in the pump capacity required, the choice of the ports thus closed being dictated by the position of the drop box relative to the lay.
  • Suction ports which can always be closed are the ports in the shuttle compartment which is disposed in the plane of the lay.
  • the preferred embodiment of the invent-ion includes upper and lower suction ports, preferably disposed in the side wall, for each shuttle compartment; the upper port may be omitted in the top compartment, and the lower port may be dispensed within the bottom compartment.
  • suction ports of the compartments which must be connected with the pump so as to function as an active, elfective suction means, are the lower suction ports of the compartments disposed above the plane of the lay, and the upper suction ports of the compartments disposed below the plane of the lay.
  • the remaining suction ports may be shut oil? from the source of vacuum whereby the suction output required is very materially reduced.
  • This selective shut-off or closing of part of the suction ports of a shuttle changing drop box loom is achieved, according to the present invention, by providing the vacuum distribution chamber with openings which are spaced from one another by the same distance, a suction conduit leading from each of said openings to one of the suction ports in the shuttle compartments of the drop box of the loom, and by providing a distributor valve arranged for displacement relative to the vacuum distributor chamber, this valve having openings which in the center are spaced from one another by three times the distance between the openings in the distributor chamber, and which above and below the center are mutually spaced by twice the distance between the openings in the distributor chamber.
  • the distributor valve should have n/2 valve openings if n represents the number of openings in the vacuum distribution chamber.
  • the vacuum distributor chamber may be mounted on the drop box, and the distributor slide valve on the bearing for the drop box whichis mounted on the loom.
  • FIG. 1 illustrates schematically the drop box of a shuttle changing loom as seen from the side opposite to the operators station;
  • FIG. 2 is a similar schematic side view of the same drop box, viewed, however, from the operators station;
  • FIG. 3 is a longitudinal section on an enlarged scale, of the vacuum distributor chamber and distributor valve associated with the drop box of FIGS. 1 and 2, and
  • FIG. 4 shows, on a still further enlarged scale, a section taken along line IV-IV in FIG. 3.
  • the drop box 1 which is disposed on the side of the lay (not shown in the drawings) comprises six shuttle compartments 2 2 2 2 2 and 2
  • the drop box 1 is mounted on a shaft 3 which is disposed for vertical displacement in a bearing 15 which is mounted on the loom (not shown in the drawing).
  • a shaft 3 which is disposed for vertical displacement in a bearing 15 which is mounted on the loom (not shown in the drawing).
  • Picking is effected by causing a picking means (not shown in the drawing) to hit the shuttle in that compartment which is disposed in the plane 4 of the lay, and to throw the same through the shed into the box provided on the other side of the lay, the surface of the lay serving as the race.
  • the drawings illustrate the position in which the shuttle compartment 2 is situated in the plane 4 of the lay.
  • the shuttle originally contained in the compartment 2 has been ejected from the compartment and is now located in the shed or in the box on the other side of the lay.
  • the remaining shuttles 5 have remained in their compartments and are inactive.
  • the wefts 6 deriving from these remaining, inactive shuttles 5 extend between the selvedge 7 and the exit for the weft on the respective inactive shuttle 5.
  • the pneumatic suction device with which the loom is equipped comprises essentially a distribution chamber 8 mounted on the drop box 1, a suction manifold leading to the suction pump (not shown in the drawing and suction conduits 10 which lead from the distributor chamber 8 to the suction ports 11.
  • the suction ports 11 are arranged in the side wall of the drop box 1 facing the operators station and in the vicinitcy of the openings facing the lay, of the shuttle compartments 2 2 and this in such a manner that shuttle compartments 2 2 2 and 2 are provided with two suction ports 11an upper port and a lower port-for each compartment, while the uppermost shuttle compartment 2 has only a lower suction port, and the lowermost shuttle compartment 2 has only an upper suction port.
  • those ports which are not needed for holding any weft 6 are shut off from the source of vacuum whereby the overall suction output, and therefore also the cost of the installation and operation of the suction system, are very materially reduced.
  • the selective shut-off of all those suction ports which at any given point of operation of the shuttle changing device, are not needed for weft holding purposes, is effected, in accordance with the present invention, by a control organ which will now be described.
  • this control organ is provided in the form of a flat distributing slide valve 12 which is arranged in the distributor chamber 8, for sliding displacement along a series of apertures 13 13 13 13 13 13 13 13 and 13 which open into the suction conduits 10, and which are spaced from one another by one and the same distance.
  • the distributing slide valve 12 is provided with a series of openings 14 14 14 14 14 14 14", 14 14 and 14 which are also mutually spaced, the distance between the openings 14 14 varying, however, in the following manner.
  • the openings 14 and 14 are spaced by a distance which equals three times the spacing between adjacent openings of the series 13 13 of the distributor chamber 8; for adjacent ones of the remaining openings 14 14 and 14 14 the spacing is always twice the distance between adjacent openings of the 13 13 series.
  • the distributing slide valve 12 is mounted on the bearing 15 of the drop box 1 on the loom.
  • the distributing slide valve 12 assumes a predetermined position relative to the series of openings 13: 13 on the distributor chamber 8, which causes quite some of these openings 13 13 to be covered up. Only those openings 13 13 are kept open by the valve openings 14 14 which by suction conduits 10 are connected with those suction ports 11 which are absolutely required to be operational, i.e.
  • openings 13 13 which are correlated with (a) both the suction ports 11 of the shuttle compartment which is disposed in the plane of the lay, (b) the lower suction ports of the shuttle compartments disposed below the plane of the lay, and (c) the upper suction ports of the shuttle compartments disposed above the plane of the lay.
  • FIG. 3 shows a position of the distributing slide valve corresponding to the position of the drop box as illustrated in FIGS. 1 and 2.
  • the distributor chamber 8 including the series of openings 13 13 rises and descends correspondingly, and the distributing slide valve assumes an ever varying position relative to the series of openings 13 13 this position always corresponds, however, to the control scheme described above.
  • the distributing slide valve 12 is guided, as illustrated in FIG. 4, in the dovetailed groove of a rail 16.
  • Guide and packing members 17 are mounted at the top and bottom points of exit of the slide valve from the distributor chamber 8.
  • the upper packing member can be disposed with if the chamber 8 is sufliciently extended upwardly.
  • the flat side valve 12 shown in the drawings may be replaced by a circular slide valve with valve openings which like a rotary piston, is arranged in a cylinder, the rotary piston being activated from the drive shaft effecting the upward and downward displacement of the drop box and the cylinder assuming the function of the vacuum distributor chamber.
  • a loom including a drop box, a pneumatic weft holding device, compartments in said drop box which open in the direction of the lay, suction ports in the side wall of said drop box which are adjacent said compartment openings, a vacuum distributor chamber for said pneumatic weft holding device, said vacuum distributor chamber having a plurality of equally spaced apart openings which connect to a plurality of corresponding suction conduits leading from said vacuum distributor chamber to said suction ports in said drop box, the improvement which, comprises a distributing slide valve arranged in said vacuum distributor chamber for displacement along said openings in said distributor chamber, said slide valve having openings which are spaced from one another at the center of the valve by three times the distance between adjacent openings in the distributor chamber and above and below the center of the valve by twice the distance between adjacent openings in the distributor chamber to adapt the slide valve to selectively close some of said openings in said vacuum distributor chamber in response to the prevailing position of the drop box relative to the lay.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US456724A 1964-05-21 1965-05-18 Slide valve controlled pneumatic weft holding device Expired - Lifetime US3324897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT441764A AT249603B (de) 1964-05-21 1964-05-21 Einrichtung zum Halten der Schußfäden an Webstühlen mit Steigkasten

Publications (1)

Publication Number Publication Date
US3324897A true US3324897A (en) 1967-06-13

Family

ID=3563728

Family Applications (1)

Application Number Title Priority Date Filing Date
US456724A Expired - Lifetime US3324897A (en) 1964-05-21 1965-05-18 Slide valve controlled pneumatic weft holding device

Country Status (6)

Country Link
US (1) US3324897A (fr)
AT (1) AT249603B (fr)
CH (1) CH422666A (fr)
DE (1) DE1535594A1 (fr)
FR (1) FR1440944A (fr)
GB (1) GB1100307A (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762399A (en) * 1952-06-19 1956-09-11 British Cotton Ind Res Assoc Multiple box looms
US2842164A (en) * 1956-09-13 1958-07-08 Robert P Head Vacuum weft holder for looms
US3186444A (en) * 1961-02-20 1965-06-01 C A Delius & Sohne Process and an apparatus for controlling the weft threads in weaving looms
US3238976A (en) * 1962-03-24 1966-03-08 Rainer Walter Pneumatic weft separator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762399A (en) * 1952-06-19 1956-09-11 British Cotton Ind Res Assoc Multiple box looms
US2842164A (en) * 1956-09-13 1958-07-08 Robert P Head Vacuum weft holder for looms
US3186444A (en) * 1961-02-20 1965-06-01 C A Delius & Sohne Process and an apparatus for controlling the weft threads in weaving looms
US3238976A (en) * 1962-03-24 1966-03-08 Rainer Walter Pneumatic weft separator

Also Published As

Publication number Publication date
GB1100307A (en) 1968-01-24
FR1440944A (fr) 1966-06-03
DE1535594A1 (de) 1970-05-14
AT249603B (de) 1966-09-26
CH422666A (de) 1966-10-15

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