Classifications

• • 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
  • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
  • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
  • D03D47/3026—Air supply systems
  • D03D47/306—Construction or details of parts, e.g. valves, ducts
• • 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
  • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
  • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
  • D03D47/3006—Construction of the nozzles
  • D03D47/3013—Main nozzles

Definitions

• elling medium (the term air being employed here as a general desig ⁇ nation for all such media for simplicity' s sake) and propel a length of the weft yarn through the nozzle and acros s the shed of the loo under
• weaving cycle of the loom is delivered via a valve from a constantly
• pressurized air supply chamber to the throat of the weft insertion nozzle directed toward the shed of the loom, which throat is preferably
• the preferred control system of application Serial No. 64, 395 utilizes a flexible diaphragm valve closing the exit opening of
• the pressurized air supply chamber and opening to place the chamber exit opening into communication with the throat passageway of the
• the air supply chamber annularly envelopes the nozzle throat
• Movement of the diaphragm valve is determined by the appli ⁇
• control pressure to the face of the diaphragm opposite the supply chamber and nozzle throat openings
• O PI diaphragm face defined by means of a pilot chamber.
• annular flexible region exhibits an operating life in the order of s everal
• the diaphragm of the above control unit may require replacement after several weeks
• An important object of the present invention is to provide an improved diaphragm valve for an air control system of the type ex ⁇
• Another important object of the invention is the control of the
• a further object is a rotary spool servo valve -which is
• OMH_ A still further object of the invention is the provision of an
• An additional object is the minimization of open space within a nozzle control system to reduce the inherent capacitance and back ⁇
• vention comprises a single generally cylindrical hollow spool body dis ⁇
• the spool is coupled to a drive shaft by
• the spool carries pressurizing and
• venting recesses in sequence on its periphery s eparated by lands and
• a pressurizing recess is located in asymmetrical relation
• the permeable housing is penetrated by a feed port -with which the pressurizing and venting spool
• recesses are alternately brought into corninunication and at least one, and preferably two, independent supply ports for supplying pres surized air to the spool supply recess or reces ses and also pres surizing the
• the exterior casing includes cooperating delivery passageways for furnishing pressurized air to the housing supply ports
• the improved "rolling action" diaphragm valve includes an axially spaced pair of diaphragms each anchored at its central and ex ⁇ terior extremities in inner and outer walls of the nozzle with a flexible annular region therebetween.
• the flexible annular regions each in ⁇ clude a coaxial radially spaced pair of telescoping or re-entrantly curved U-shaped convolutions opening in opposite directions, i. e. toward the pilot chamber on the one hand and toward the nozzle open ⁇ ing on the other hand.
• the respective convolutions are braced between generally parallel backing surfaces on the nozzle -walls and retaining lips project partially into the respective convolutions to maintain their general contour while permitting limited axial telescoping movement thereof.
• Fig. 1 is a longitudinal sectional view partially in cross * section and partially in elevation taken through the rotary servo valve
• Fig. 2 is a detailed perspective view of the rotary spool body
• Fig. 3 is a transverse cross-sectional view of the spool body
• Figs. 4- 10 are detailed views showing various operative posi ⁇
• Fig. 4 is a fragmentary longitudinal sectional view showing
• Fig. 5 is a side elevational view of the assembly casing showing in dotted lines one arrangement of air pas sages therein with
• Fig. 6 is a transverse sectional view taken substantially
• Fig. 7 is a transverse sectional view taken substantially
• Fig. 8 is a longitudinal section similar to Fig. 4 but showing
• Fig. 9 is a side elevation of the assembly similar to Fig. 5
• Fig. 10 is a transvers e sectional view similar to Fig. 6 but taken along line 10- 10 of Fig. 8 and showing the nozzle body in venting
• Figs. 11- 14 are transverse sectional views similar to Figs. 6 and 10 but enlarged to show only the spool body and the surrounding
• the spool body is shown in -Fig. 11 in its position at the beginning of pilot pressure venting and consequential opening of the nozzle diaphragm valve and in Fig. 12 in its position at the beginning of pilot chamber pressurization and nozzle valve closing, but with the spool land of lesser arcuate extent in leading rotational position, while
• the spool body is shown in pilot chamber venting position in Fig. 13 and in pilot chamber pressurizing position in Fig. 14, both with the arcuately long spool land in leading rotational position;
• Figs. 15- 18 are plots of pressure versus time in ms, from the nozzle firing pulse, for nozzle throat pressure (in solid lines) and the pilot chamber pressure (dotted lines) at two levels of pilot pressure with the short spool land in leading rotational position in Figs. 15 and 16 and in trailing rotational position in Figs. 17 and 18;
• Fig. 19 is an enlarged detailed cross-sectional view through the axis of the weft insertion nozzle, showing a preferred embodiment of the convoluted "rolling action" diaphragm valve;
• Fig. 20 is an enlarged end view taken partially in section substantially along line 20-20 of Fig. 19 with the diaphrag and retain ⁇ ing ring omitted to show the interior space between the diaphragms;
• Fig. 21 is an overall view greatly simplified of the complete nozzle control system of the present invention. Detailed Description of Illustrative Embodiment
• the numeral 31 designates a casing for the improved single spool servo valve assembly of the present in ⁇ vention which has a cylindrical interior opening 33 passing axially therethrough but can otherwise be of any convenient exterior configur ⁇ ation, for example, rectangular from all sides.
• the casing side walls can be penetrated by spaced apertures 35 for the reception of mounting bolts for attachment to a fixed support (not shown).
• Fitted in the in ⁇ terior opening 33 adjacent one end, i. e. to the right in Fig. 1, is a spaced pair of roller or other bearings 39a, 39b and an elongated drive shaft 37 is press fitted into the inner races of these bearings for rotation therein.
• the inner end of shaft 37 has an enlarged head 41 to provide a shoulder retaining the inner bearing 39a, while the outer bearing 39a is retained on shaft 37 by means of a lock nut 43 anchored thereon.
• the bearings are held apart by a sleeve 45 and the outer race of the outer bearing is retained against axial movement relative to the casing with a retaining ring 47.
• a threaded aperture 48 is pre ⁇ ferably drilled into the top wall of housing 31 to facilitate attachment of the housing in operative position to a suitable fixture (not shown) by means of a bolt or other fastening means.
• Drive shaft 37 extends outside the right end of casing 31 be ⁇ yond lock nut 43 and rotatably supports a driving pulley 51 encircled by a driving belt 53 driven from a source not shown.
• Pulley 51 is gripped for bodily rotation with shaft 37 by a friction coupling which can be
• the pulley has a frusto- conically shaped hub 55 which is adapted for mating frictional engage ⁇
• Collar 59 can be forced into locking frictional engage ⁇ ment with the pulley hub or released therefrom by means of a nut 61 in
• the inside of pulley hub 55 abuts the lock nut 43.
• the en ⁇ larged end 41 of shaft 37 is notched as at 65 so that -the shaft bearings,
• friction coupling, etc. can be easily sub-asmuld as a unit and then
• a portion of shaft 37 adjacent head 41 is formed with an axially extending central aperture to receive one end of an elongated
• Driving rod 69 pro ⁇
• Spool body 75 is of generally cylindrical shape with a hollow
• interior bore 77 and the projecting end of drive rod 69 extends to about the midpoint of bore 77 and is frictionally embedded at its termination
• Plug 79 (see in dotted lines in Fig. 1 and in section in Fig. 3). Plug 79 has a cylindrical exterior which is pres s fitted within bore 77
• drive rod 69 is sufficiently flexible as to permit
• Spool body 75 fits within the central aperture 81 of a housing
• the permeable material has a hard surface, as preferred, it can act as a bearing for the spool body in the event air pressurization should
• Permeable housing 83 is in turn fixed in air tight engagement within the interior opening 33 of casing 31 and can be positively secured against relative axial movement with
• spool body 75 is formed with two
• OMP extending axially along the otherwise solid cylindrical surface of the spool body between the circular grooves 87a, b. Where two such channels are used, they are diametrically opposed and separate the spool periphery into two segments 91 and 93. In one of these segments, e.
• an axially elongated air feed slot 95 located in lengthwise symmetry with the sleeve body length, passes entirely through the spool body wall into communication with the interior bore 77 thereof, while on the other peripheral segment 93 the spool body wall is pene ⁇ trated by a spaced pair of axially elongated air balancing slots 97 a, 97b which are equal in length and area to one-half of the length and area of slot 95, being situated in symmetrical position intermediate the ends of slot and the adjacent walls of circular grooves 87a, 87b.
• Slots 95 and 97a, b could be located symmetrically with the arcuate length of the corresponding segment, i. e. equidistant from the channels 89a, 89b, but are preferably asymmetrically arranged so as to be closer to one channel than to the other for a reason to be explained.
• the exterior periphery of air permeable housing 83 Adjacent its ends, the exterior periphery of air permeable housing 83 is provided with circular manifold recesses 101a and 101b which are elongated to cover a significant portion, say about 20% each, of the housing length.
• Recesses 101a, b each communicate with a peripherally spaced array, say three, of ports 103a and 103b passing radially through the thickness of housing 83 at equi- spaced points there- around, the axial location of ports 103a and b, being such as to coincide and thus communicate with the circular air supply grooves 87a, b, in spool body 75.
• Intermediate peripheral recesses 101a, b, sleeve 85 is penetrated by means of an elongated air feed port 105 (best seen in Figs .
• housing 83 The opposite side of housing 83 is similarly penetrated by two smaller air balancing ports 107a and 107b (seen in dotted lines in Figs. 6 and 10) which likewise register axially with, and are generally equal in all
• the assembly casing 31 is constructed with an arrangement
• casing is constructed of several parts to facilitate the machining of the various pas sageways therein.
• casing 31 has on one side an air supply connection 111 (see especially Figs. 5 and 7) -which is constantly connect ⁇
• housing recesses 101a, b are constantly exposed to pressurized air which insures that the entire housing 83 is permeated by air.
• a nozzle feed connection 117 which is in permanent communication via a hose or conduit (not seen) with the pilot chamber of the nozzle.
• Nozzle feed connection 117 joins with a vertical leg 121 which intersects with a short lateral leg 123 opening into an axially elongated arm section 125 (best seen in Figs. 5 and 9).
• arm 125 The function of arm 125 is to feed the pressurized air to and from the air balancing slots 97a, 97b, in spool body 75 by way of housing balancing ports 108a, b, and arm 125 branches laterally as at 126a, b, in registration with housing ports 107a, b.
• arm 125 has a vertical branch 127 joining at its upper end -with a lateral bypass 129 (see Figs. 6 and 10) th">.t crosses to the opposite side of casing 31 where it connects with a downwardly directed vertical leg 131 that is axially enlarged at its lower end as at 133 and branches in vertical alignment with the opposite branches 126a, b.
• Enlargement 133 serves to establish communication with the nozzle feed slot 95 in the spool body via the corresponding housing port 105 in the permeable sleeve and branches laterally as at 135 to communicate with port 105.
• connection 117 connects the nozzle pilot chamber with its as sociated
• the rotary spool body carries both supply channels 89a, b, and venting port 95 and the rotational position of the rotary spool body, therefore, determines the ultimate direction of air flow within these
• venting slot 95 will be
• housing bore 81 with a short land 91a, 93a, in leading position to feed
• feed port 105 becomes closed by the trailing segment 91b, 93b and remains closed until that segment
• port 105 will remain closed for a shorter period of time due to the les ser arc of the trailing short segment 91a,
• valve or valve sub- assembly where plural spaced diaphragms are em ⁇
• phragm valve can be changed so that, as is preferred, a greater nozzle
• air supply pressure can be controlled with a lesser pilot chamber pressure.
• Figs. 15- 18 which plot pilot chamber pressure (broken lines) and nozzle throat pressure (solid lines) against time, starting at the beginning of venting of the pilot chamber and thus actuation of the nozzle (P 0 ), for a nozzle con ⁇ taining an air supply at 70 psig and an effective pilot chamber actuation pressure, i. e. at which the diaphragm valve opens and closes, of 45 psig at two levels of pilot chamber supply pressure (i.
• OMPI remains at a minimum, being closed off during this interval by the
• the nozzle continues to emit pressurized air
• the nozzle has an exterior casing 150 to which air under pres sure is supplied via an inlet port 152.
• part central core 154a, b extends through the interior of the nozzle
• the two parts 154a, b, of the core define
• throat passageway 158 is contoured, as is more fully explained in the above mentioned application Serial No. 64, 180.
• the nozzle body is
• ins ertion tube 168 projects beyond the point of minimum convergence of the throat pas sage into the divergent region 164 " and, more preferably,
• OMPI at least to the exit opening of the nozzle (the yarn itself being omitted from the drawings).
• the interior face of head 166 is cut away as an annular recess 170 which defines a pilot chamber 171 for the nozzle to which pressurized air is applied and released via the port 172.
• exterior and interior spacer rings 174, 176 of annular shape are interposed between outer and inner margins of head 166 and the ends of casing 160 and inner core part 154b and clamped between the opposed surfaces thereof on both sides of the rings are the exterior and interior margins of two axially separated diaphragms 180, 210.
• each such diaphragm is thickened to form beads at 178a, b, which are adapted to fit within corresponding annular grooves 179a, b, machined for that purpose in the faces of spacer rings 174, 176 so as to positively grip the opposite margin of each of the two dia ⁇ phragms when the nozzle head 166 is secured on casing 150.
• the diaphragm adjacent the supply chamber 156 and closing the end opening thereof is designated 180; it is deformed in its intermediate region into two radially spaced apart annular convolutions 182, 184, each generally U-shaped in cross-section and opening towards supply chamber 156.
• annular retaining ring 192 which is anchored in place on floating ring 190 for movement therewith by a peripherally spaced series of pins 194
• Pins 194 extend through ring 190 and are encircled at each of their outer ends by a
• Truarc split washer 196 seated in peripheral grooves formed on the pin
• ring 192 has an unbalanced or lopsided "flying U" cross - sectional con ⁇
• convolution 182 with a re-entrantly curved termination, while its innermost leg 202 extends along the adjacent -wall of convolution 182,
• hub 204 defines
• ring is constituted in two parts, the main part 190 and hub 204, for two reasons, first to facilitate assembly and second to allow the ratio be ⁇
• OMP1 Hub 204 is associated with the outer flexible diaphragm 210 closing pilot chamber 170 and similarly to nozzle supply chamber dia ⁇ phragm 180 diaphragm 210 is deformed into two radially spaced U- shaped convolutions 212 and 214 opening toward the pilot chamber.
• pilot chamber diaphragm 210 between the convolutions 212 and 214 is in contact with the outer end face of hub 204 and clamped there- against by means of an inverted lopsided "flying U" retaining ring 216 similar to ring 192 and having its legs 218, 220 contoured roughly the same as legs 200, 202 of ring 192 to project into the convolutions to maintain their contour while still affording some freedom of axial dis ⁇ placement thereto.
• Inverted retaining ring 216 is affixed in place to hub 204 by peripherally spaced bolts 222 in threadwise engagement at their inner ends with the floating ring body 190.
• the two diaphragms are made of tough, strong, durable, flexible weaving material, such as a rubberized fabric or a polymer film and the lips of the respective retaining rings 192, 216 function in projecting into the interior of the web convolutions to main ⁇ tain to some degree the shape of those convolutions, it is nonetheless advisable to furnish backing support to the side -walls of the several convolutions and thereby substantially eliminate any possibility for any of these convolutions to spread out or balloon laterally which would tend to reduce their effectiveness during operation and significantly decrease their working life.
• the opposed inner and outer sides of the floating ring 190 and the respective spacer rings 174, 196 have their surfaces adjacent the -walls of legs of the respective diaphragms shaped to provide shoulders contoured to follow the shape of the diaphragm
• each interior convolution 184, 214 is preferred that the interior wall of each interior convolution 184, 214
• circular tongues could be provided on the outer edges of nozzle casing 150 and head 164 to project into the interior of the adjacent convolutions
• a separate valve seat plate formed of wear re ⁇ sistant resilient material such as high density polyurethane or the like
• the nozzle supply pres sure in supply chamber 156 which bears against the nozzle diaphragm 180 will
• dividual convolution walls telescope with respect to one another, to
• Pilot chamber diaphragm 210 behaves in a similar but inverted fashion, the innermost walls of its two convolutions 212, 214 becoming shorter
• vents 224 passing through the outer ring 174 and nozzle head 166.
• rings 174, 176 which are preferably restricted in order to limit bodily lateral movement of ring 190, are prevented from entrapping air

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Multiple-Way Valves (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=22161025

Family Applications (1)

Country Status (8)

Cited By (2)

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Citations (5)

• 1981
  • 1981-01-07 BR BR8108951A patent/BR8108951A/pt unknown
  • 1981-01-07 GB GB08224676A patent/GB2105377B/en not_active Expired
  • 1981-01-07 EP EP81901583A patent/EP0067994B1/en not_active Expired
  • 1981-01-07 DE DE8181901583T patent/DE3172175D1/de not_active Expired
  • 1981-01-07 WO PCT/US1981/000017 patent/WO1982002411A1/en active IP Right Grant
  • 1981-06-15 CA CA000379710A patent/CA1155730A/en not_active Expired
  • 1981-10-08 BE BE0/206193A patent/BE890668A/fr not_active IP Right Cessation
  • 1981-11-12 IT IT24990/81A patent/IT1139693B/it active

Patent Citations (5)

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