US3799211A - Method of and apparatus for preparing a weft supply in a magazine for weft insertion in shuttleless looms - Google Patents

Method of and apparatus for preparing a weft supply in a magazine for weft insertion in shuttleless looms Download PDF

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Publication number
US3799211A
US3799211A US00278630A US27863072A US3799211A US 3799211 A US3799211 A US 3799211A US 00278630 A US00278630 A US 00278630A US 27863072 A US27863072 A US 27863072A US 3799211 A US3799211 A US 3799211A
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Prior art keywords
weft
drum
magazine
side wall
wall
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US00278630A
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L Klinecky
S Krmela
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Zbrojovka Vsetin np
VYZKUMNY USTAV LYKOVYCH VLAKEN
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Zbrojovka Vsetin np
VYZKUMNY USTAV LYKOVYCH VLAKEN
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Publication of US3799211A publication Critical patent/US3799211A/en
Priority to US05/669,724 priority Critical patent/USRE30318E/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
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/368—Air chamber storage devices

Definitions

  • the present invention relates to a method of and an apparatus for preparing a weft supply in a magazine for weft insertion in shuttleless looms, particularly looms with pneumatic or hydraulic weft insertion, said supply being constituted by prolonging the yarn path by action of an air flow in the magazine into which said weft yarn is continuously fed upon being withdrawn from a stationary supply; the weft is withdrawn from the magazine at weft insertion intervals at a length necessary for one weft insertion (one pick).
  • Said apparatus is provided with at least one magazine, mounted between the feeding mechanism and the measuring mechanism, which is arranged in front of the weft inserting mechanism, particularly the nozzle for pneumatic or hydraulic weft insertion in a loom.
  • the weft supply for pneumatic or hydraulic picking is made principally by two methods.
  • weft is intermittently wound from the supply bobbin onto a measuring disc, from which the measured part of the weft is withdrawn and ejected through the inserting nozzle into the shed.
  • a weft supply of yarn is accumulated pneumatically into a loop form.
  • the rotary measuring discs with the winding of weft are substantially divided into single or multiple winding discs with continuous or intermittent winding.
  • a relatively widely used construction is a measuring device which is used in looms with pneumatic and hydraulic weft insertion which is constituted substantially by two rotary parts rotating at different speeds. One such part produces winding of the weft prepared for further weft insertion, and the other such part finishes the preceding phase by taking off the weft from the detent of the first part immediately before startingweft insertion.
  • the first or basic part of the above measuring device is constituted by an actual disc shaped magazine provided at its surface with a helical groove for depositing the measured weft; such part is provided with a detent, controlled by an inner cam, for gripping the weft, this being the beginning of the measurement process.
  • the disc shaped magazine with a detent is adjustable to a certain extent in its angle value in view of the position of the batten, this making it possible to adjust the basic length of the measured weft in view of the width of the wooven goods.
  • the other, second part, the withdrawing part of the measuring device which is constituted by a partial cylindrical segment, moves coaxially at a higher velocity than the first, basic part, and thus at a certain moment, at which the front edge of this second part moves past, or runs ahead of the detent of the first, basic magazine part, the weft guided by said detent is removed therefrom and thus the measured weft yarn supply is released for insertion.
  • a substantial disadvantage of the said device consists in that approximately only percent of the weft length necessary for the given fabric width is wound on the measuring drum (magazine drum) during each cycle.
  • the necessary missing length is practically measured only during the actual insertion by the adjusted intensity of the weft inserting jet in dependence upon the tension of the inserted weft which is given by the adjusted braking of the weft brake.
  • the adjusted weft length is prolonged for the sake of quality, however, with a higher waste of material.
  • a further disadvantage of this method of weft measurement consists in that the measuring device withdraws yarn intermittently from the supply bobbin, or at an undesired varying withdrawing speed during each cycle.
  • the simplification has certainly influenced the reduction of production costs to a certain extent, however, the range of assortment of weft materials to be processed was restricted in view of the original embodiment, prevailingly to finer and smoother materials.
  • a method of preparing weft from a stationary weft supply is known by means of a measuring drum or reel, on which the yarn is deposited in several windings.
  • the winding of yarn on to the measuring drum is continuous, the required length being intermittently withdrawn from the wound supply.
  • This method of preparing the weft uses the continuous supply weft to the measuring drum, but is complicated in its construction and takes up a large area, while a change in weft length for insertion is to be performed during rest of the loom by exchange of the groove discs.
  • the weft supply is constituted by blowing the yarn into a loop form or by blowing or sucking in the weft into a loop.
  • the weft magazine is made by a tube bent into a loop form, of which the front end is connected to a pressure air source and the rear end of which opens at the point of weft insertion.
  • the weft is brought into the inlet part of the tube, the weft being withdrawn from a stationary bobbin supply via a controlable brake.
  • the tube is provided with a slot on the inner side of the circular part of the tube magazine.
  • the weft withdrawn from the'bobbin via an opened brake is entrained by an air flow through the tube towards its outlet, thus forming a loop.
  • the brake interrupts further feeding, and thus the weft is withdrawn by inertia from the slot and advances into the shed.
  • This device measures, on the one hand, the appurtenant length'of the weft, and accelerates, on the other hand, the weft before its actual insertion.
  • the brake is controlled by a light indicator, which is adjustably arranged on that part of the tube which checks the presence of weft in the supply tube.
  • the length of the slot is variable by a limitor traversably mounted on a part of the tube, by.means of which a relatively accurate adjustment of the required weft length is made possible even during operation of the loom.
  • the method of constituting a loop as a weft reserve uses a substantially flat chamber, into which the fed weft is drawn in on a part of its length by the effect of underpressure or by blowing in into a long loop by pressure air from an ejector nozzle.
  • a flat tape body particularly in higher deniers and with a width of about 4 mm, has substantially different requirements for being prepared for insertion from thos of classical materials.
  • a tape particular-1y upon being wound onto various types of grooved or other measuring drum magazines, very frequently covers a preceding winding by a following winding and thus unfavorably influences the conditions of withdrawal and insertion of the tape.
  • the brake is the reason for failures which make it impossible to achieve the necessary operational reliability of the apparatus. Neither braking by gripping the weft nor by embracing it is suitable for braking tape materials.
  • twists are imparted to the tape, such twists being accumulated upstream of the brake. After such twists pass through the brake, they cause loop forming, which adversely affect the required operation reliability of weaving by the loom.
  • the purpose of the present invention is to create a novel method of preparing the weft in the magazine with ejectorial introduction of weft, and to provide a corresponding apparatus, which eliminate to a considerable extent the disadvantages of the methods and apparatus hitherto known; such method and apparatus are suitable for weaving a weft in the form of a narrow tape.
  • the above-mentioned conditions are substantially fulfilled by the method of preparing a weft supply in the magazine for weft insertion in shuttleless looms, particularly looms with pneumatic or hydraulic weft insertion of the present invention.
  • the method prolongs the yarn path by the effect of an air current in the magazine, into which said weft is continuously fed upon being withdrawn from a stationary supply.
  • the weft is withdrawn from said magazine at weft inserting intervals in a length equivalent to one pick.
  • a helical air flow is created inside the magazine, said air flow directing the fed weft into a spatial helix or spiral, from which the picking length of weft is axially withdrawn.
  • the helical air flow is derived from pressure air fed into the injector magazine or produced inside the magazine by a fan.
  • the device is provided with at least one magazine mounted between the feeding mechanism and measuring mechanism, the latter of which is arranged in front of the weft inserting mechanism; the weft inserting mechanism may be the nozzle for pneumatic or hydraulic weft insertion.
  • the first embodiment is made in such manner that the magazine is substantially a hollow drum with a rear wall connected to the front wall by a side wall, the front wall being in the form of a convex surface of revolution provided at its center with an outlet opening for the weft.
  • the inner part of the side wall is an annular guiding surface which directs an air flow in dependence of the position of the injector axis into a spatial helix or spiral.
  • Said annular guiding surface has 'two parallel fields of which the rear one, into which the injector opens, and a part of the front field constitute a path for the fed air current, while the remaining part of the front field is provided with ventilation openings for the exit of pressure air from the drum.
  • a directing body of circular cross section such body directing the withdrawn weft.
  • the directing body is separated from the side wall and the front wall of the drum by a gap.
  • the side wall of the drum has the shape of a frusto-conical shell, which is connected at is smaller circular base to the rear wall of the drum; the side wall may also be in the form ofa circular cylindrical shell.
  • the axis of the injector is situated in the plane tangential to the side wall of the drum, which has the shape of a frusto-conical shell connected with its smaller circular base to the rear wall of. the drum, said axis being normal to the surface straight line of the side wall, said surface line passing through the point of penetration of the injector axis into the side wall.
  • the injector axis is situated in a plane tangential to the (a) frusto-conical side wall of the shell which is connected by its smaller base to the rear wall of the drum, or (b) to the side wall in the form of a cylinder, said axis with the surface line of the side wall which passes through the point of penetration of the injector axis into the side wall an angle from 95 to 105, in the anticlockwise direction.
  • the device according to the present invention which is destined for longer weft lengths has mounted on the exit openings are covered by a plate in which are arranged in a row guiding outlet openings for weft yarns. Between the measuring mechanism and the front pair of drums there are mounted four guiding eyelets for withdrawing weft yarns from drums. This arrangement insures a reliable weft withdrawal from the magazines.
  • the second basic embodiment of the device is characterized in that the magazine is substantially a hollow drum with the rear wall provided with at least one sucking opening and connected to the front wall in the form of a convex surface of revolution, provided in the middle with an exit opening for the weft by means of the side wall of which the inner annular guiding surface, in the form of a frusto-conical shell connected with its smaller circular basis to the rearwall, constitutes a path for the air flow.
  • Such side wall has two parallel fields of which the rear field into which the feeding tube for the weft being withdrawn from the feeding mechanism, opens tangentially is a smooth surface and the front field is at least on a part of the surface provided with rear field of the guiding surface a helical thread for directing the fed air flow into a spatial spiral or helix, a passage being provided between the top edge and the directing body for the weft to be withdrawn.
  • the device according to the present invention enables the assembling of several magazines into a design unit of multicolor weaving.
  • another magazine inside one magazine, another magazine is coaxially mounted, of which the side wall and front wall constitute a directing body of the outer drum, through the side wall of which there passes the injector of the inner drum.
  • Said inner drum is parallel to the injector of the outer drum, which has an annular guiding surface larger than the width of the annular guiding surface of the inner drum, and both front surfaces of the rotary guiding surfaces being aligned with respect to the drum axis.
  • the front wall of the inner drum converges into a neck finished by an exit opening, which is flush with the outlet opening of the outer drum or projects therefrom.
  • one pair of the outer and inner drums is coaxially assigned another pair of the outer and inner drum in such manner, that the two'pairs are mounted behind each other and the front wall of the outer drum of the rear pair of drums constitutes the rear wall of the front pair of drums.
  • the front walls of the rear pair of drums and the front wall of the innerdrum of the front pair of drums converge into coaxially arranged necks, of which the exit openings are flush with the exit opening of the outer drum of the front pair of drums or emerges therefrom.
  • a fan wheel coaxially with the drum, said wheel being surrounded by the wall of the directing body of circular shape for the withdrawn weft, the directing body being separated from the side wall and the front wall by a gap.
  • Said wall is'provided with tangential channels confronting the fan wheel, which aredirected against the rotary guiding surface of the side wall directing partial air flows from the channels into the helical air flow.
  • this second modification enables the collecting of a plurality of magazines into one construction unit.
  • an inner magazine is mounted coaxially in the hollow of one magazine, the rear wall of which, in the form of an annular surface, transversely separates the channels into two parts, of which one is directed against the rear field of the outer dru, through which the feeding tube from the inner drum passes,and the other against the rear field of theinner drum,- the side wall and the front wall of the inner drum constituting a directing body of the outer drum.
  • the injector tube is fastened in a sleeve mounted on the side wall of the magazine.
  • the injector tube and the feeding tube are resiliently flexible for adjusting its inlet end along the nip line of the feeding rollers of the feeding mechanism.
  • the advantage of the method of preparing weft in the magazine according to the present invention and the device according to the present invention for performing said method consists in that the weft is fed continuously into the magazine without any impacts and withdrawn therefrom in the same manner.
  • the withdrawal of weft from the magazine is initiated upon a pulse of 'the gripping mechanism of the measuring device.
  • a further substantial advantage is the reduction of the breakage rate to a minimum and the attaining of material economy, which arises by reason of the substantial reduction of the necessary length of projection of the weft ends at the side of the weft front end location.
  • the advantage of the actual device according to the present invention is its advantageous spatial arrangement, simple magazine manufacture, an easy maintenance, and operational reliability.
  • the construction of the magazine makes possible the constitution of a device consisting of several magazines for mixing wefts, or for color change, respectively.
  • FIG. 1 is a fragmentary view in perspective of a weaving machine with pneumatic weft insertion with a magazine, a feeding and measuring mechanism and a weft inserting nozzle;
  • FIG. 2 depicts an injector in longitudinal axial section
  • FIG. 3 is a view in perspective of the magazine with an injector
  • FIG. 4 is a front view of a magazine with the weft shown at the moment after having withdrawn the inserting length of the weft;
  • FIG. 5 is a front view of a magazine with the weft shown at the moment before the withdrawal from the magazine.
  • FIG. 6 is a side elevation of a magazine with a side wall in the shape ofa frusto-conical shell with the injector axis disposed tangential to the shell;
  • FIG. 7 is a view similar to FIG. 6 with the injector axis offset from the position thereof shown in FIG. 6;
  • FIG. 8 to 11 are views in side elevation of various shapes of drums
  • FIG. 12 to 14 are views in side elevation of various shapes of directing bodies
  • FIG. 15 illustrates in axial section a magazine provided with a helical thread
  • FIG. 16 is a view in axial section of a combination of both the outer and inner magazine
  • FIG. 17 is a section on the plane XVII XVII'of FIG. 16',
  • FIG. 18 is a view in axial section of a combination of two magazines arranged behind each other;
  • FIG. 19 is a fragmentary view in side elevation of a magazine as shown in FIG. 18;
  • FIG. 20 is a view in axial section of a combination of our magazines
  • FIG. 21 is a fragmentary view in magazine as shown in FIG. 20;
  • FIG. 22 is a view in axial section of a magazine with a fan
  • FIG. 23 is a section on plane XXIII XXIII of FIG. 22;-and
  • FIG. 24 is a view in axial section of a combination of two magazines with a fan.
  • FIG. 1 there is shown a weft picking device of a loom with pneumatic weft insertion.
  • a weft picking device of a loom with pneumatic weft insertion includes a magazine 1, mounted between a feeding mechanism 2 and a braking or retarding mechanism 3, the latter mechanism being mounted in front of the pneumatic weft inserting nozzle 4 in the weft inserting plane.
  • the feeding mechanism 2 whichwithdr'aws weft 5 which is unwound from a supply bobbin 6, has two feeding rollers 7,8 in the shape of oppositely mounted truncated cones mounted in bearings 9 in a frame 10 of the weft inserting device.
  • the upper feeding roller 7 is freely mounted on the lower feeding roller 8, on the shaft 1 1 of which there is mounted a sprocket 12 driven by a chain 13 from thedriving mechanism (not shown) of the loom.
  • the feeding mechanism 2 is provided with a directing yarn guide 14,.constituted by a yoke with two guiding eyelets 15,16 mounted in front of and behind, respectively, the pair of feeding rollers 7,8.
  • the directing yarn guide 14 is traversably mounted by means of known means (not shown) along the nip line .of feeding rollers 7,8 in the direction of the double arrow 17.
  • the adjustment of the appurtenant position of the directing yarn guide 14 is performed manually or mechanically.
  • An injector 18 is attached to the feeding mechanism 2, said injector opening into the magazine 1.
  • Injector 18 (FIG. 2) consists of a body on neck 19, into which tube 20 is inserted e.g. by pressing in.
  • Tube 20 is made either as a whole of a resilient flexible plastic, e.g. polyamide and is provided at its end with a sleeve 21 of metal, as shown, or is made of a solid (rigid) plastic.
  • Tube 20 opens tagentially into magazine 1 (FIG. 3).
  • Hollow 24 is connected by sleeve 26 to a hose (not shown) from a pressure air source.
  • the body of neck 19 is connected by a means (not shown) to the directing yarn guide 14 in such manner, that upon its adjustment along the nip line of feeding rollers 7, 8 the actual neck 23 is simultaneously adjusted into an appurtenant position aligned therewith to receive the weft.
  • Magazine 1 (FIGS. k,3) is constituted substantially by a hollow drum 27 preferably made of plastic material, said drum being constituted of a rear wall 28 fastened by means (not shown), e.g. by screwing or cementing to the frame 10 of the weaving machine, a front wall 29 in the form of a frusto-conical shell provided in its center with an discharge opening 30 and a side wall 31 in the form of a frusto-conical shell, which is connected with its smaller circular base to the rear wall 28.
  • the inner surface of side wall 31 is constituted by a straight fixed guiding surface 33 through which the sleeve 21 of injector 18 is tangentially connected.
  • Surface 33 is in the form of a surface of revolution, more particularly, the frustrum of a cone.
  • the guiding surface 33 is separated into two parallel fields 34, 35, of which the rear field 34 is smooth, while the front field 35 is provided on at least a part of its surface with air exhaust or ventilation openings 36.
  • These ventilation openings 36 are distributed either on the whole surface of the front field 35 or only in a certain part of its section.
  • the ventilation openings 36 are made in a section of 170 to 360 expressed in arcuate measure from the point of entrance of injector 18 into the side wall 31 of front field 35 in the anticlockwise direction.
  • the section with ventilation openings 36 begins in about the third of the second quadrant of drum 27 and goes on over the third and fourth quadrants into the first third of the first quadrant, coming there to an end in front of the point of entrance of injector 18 into the side wall 31, the length of sections of the ventilation openings 36 being thus in arcuate measure about 240.
  • section of ventilation openings 36 begins substantially at the same point as'in the arrangement as shown in FIG. 4 and is, however, finished in about the third quadrant of drum 27.
  • the size of ventilation openings 36 which are arranged in two or three circumferential rows, is e.g. 1.5 to 2 mms with a gauge of about 5 mm.
  • Sleeve 21 opens tangentially into the rear field of the side wall 31 of drum 27, said sleeve being fastened to said wall e.g. by welding or cementing.
  • Axis 37 of injector 18 is situated in a tangential plane (not shown) to the side wall 31 and is either disposed normal to the surface line 38 of side wall 33 at the point of penetration of axis 37 into side wall 33 (FIG. 6) or forms with the said surface line 38 an angle alpha (d) of 95 to 105 in the anticlockwise direction as shownin FIG. 7.
  • a nonrotatable directing body 40 of circular cross-section e.g. by cementing, said body being made advantageously of plastic material.
  • the directing body 40 (FIG. 3) is made by a side wall 41 in the form of a frusto-conical shell, which passes over by a wane 42 into a cone 43 with a skewed surface 44 which is situated in the axis (not shown) of drum 27 passing through its exit opening 30. Between the directing body 40 and side wall 31 and the front wall 29 there is a channel 45 which is at first enlarged in the direction towards the exit opening 30 and is then narrowed (FIG. 3). Between top 44 and exit opening 30 there is a gap 46.
  • the air flow fed tangentially by injector 18 into drum 27 to the rear field 34 of guiding surface 31 creates a helical stream by the effects of the direction of feeding of the air and of centrifugal force acting upon the air flow.
  • Weft 5 fed by injector 18 into drum 27, is directed by the helical stream and the shape of guiding surface 33 directed into the spatial weft spiral 47 from which said weft is intermittently withdrawn.
  • vents 36 The excessive air escapes through ventilation openings 36.
  • the escape of air through said vents simultaneously stimulates the creation of a helical stream inside drum 27 and simultaneously spreads the weft spiral 47 along the shaping guiding surface 33 of magazine 1.
  • the directing body 40 prevents, on the one hand, the eventual entanglement of weft 5 inside drum 27 and acts, on the other hand, upon the creation of helical air flow.
  • Mechanism 3 consists of a stationary lower jaw 49 and an upper jaw 50 arranged on an arm 51 which is swingable about a stationary pivot pin 52 fastened on the frame 10 of magazine 1.
  • the upper jaw 50 which is pressed towards the lower jaw 49 by a coil tension spring 53, is controlled by a cam 54, the movement of which is derived from a driving mechanism (not shown).
  • Weft inserting nozzle 4 opens by exit tube 55 into the shed 56 made of warp threads 57. At the selvedge of the resulting processed fabric 58 there are mounted known scissors 59 or a burning loop.
  • Weft 5 is withdrawn from a supply bobbin 6 by feeding mechanism 2 which has been adjusted to the required feeding velocity.
  • the thread leaving the feeding mechanism 2 is sucked in by an injector 18 and blown on to a smooth texturing surface of the magazine, such surface being constituted by the rear field 34, where said yarn is directed by the effect of the shape of that surface and the constituted helical air flow into a spatial weft spiral 47.
  • weft 5 is gripped by jaws 49, 50.
  • the jaw 50 is released from jaw 49 by turning cam 54, and thus weft 5 is ejected by the effect of pressure air by the inserting nozzle 4 into open shed 56.
  • weft 5 is again gripped by jaws 49, 50.
  • its part between the selvedge of fabric 58 and insertion nozzle 4 is cut off by means of scissors 59 in the proximity of fabric selvedge 58.
  • FIG. 4 the situation as shown in drum 27 at the moment after withdrawal of the weft insertion length from magazine 1.
  • Weft 5 is directed from the nozzle of injector 18 to the exit opening 30 of drum 27.
  • FIG. 5 the situation in drum 27 shortly before withdrawal of weft from the spatial weft spiral 47 is shown.
  • the attendant adjuststhe appurtenant position of the yarn guide 14 along the nip line of feeding rollers, 7, 8. Simultaneously with the movement of yarn guide 14, tube 20 and neck 23 is advanced by resilience of material into the appurtenant position aligned with the yarn guides 14, 15.
  • drums 27 are shown with different shapes of the guiding surface 33a-33d, respectively and of the front surface 2911-2911, respectively.
  • drum 27 corre- I sponds to the embodiment of magazine 1 as shown in FIG. 1.
  • the guiding surface 33b passes over by a wane into front wall 29b constituted by a skewed convex surface. This arrangement prevents the originating of undesired air turbulence at the point at which the guiding surface passes over to front wall 29a.
  • surface 330 corresponds substantially to the embodiment of drum 27 as shown in FIG. 8, however, the exit opening 300 has a substantially larger diameter.
  • the dimensions of the diameter of outlet opening 30 can be according to need as large as two-thirds of the maximum diameter of drum 27 without the danger of blowing the spatial weft spiral 47 out of drum 27.
  • the advantage of the embodiment as shown in FIG. consists in easier guiding of weft. It is, however, necessary to grip the weft by jaws 49, 50, in this case reliably, for which purpose a yarn guide is situated in front of the measuring mechanism 3.
  • a drum 27d is shown which is provided with a side wall 37d in the shape of a cylinder shell, which passes over by a wane into front wall 29d in the form of a frusto-conical shell.
  • FIGS.12 to 14 exemplary embodiments of directing bodies in the shape of bodies of revolution are diagrammatically shown.
  • a body 40a is shown, made by a frusto-conical shell 41a, of which the smaller circular base is situated adjacent to the rear wall 28 of drum 27, said frusto-conical shell passing over by wane into cone 43a.
  • This and similar embodiments of directing bodies are suitable for most types of weft tape materials of smoother, finer, and more supple character.
  • the directing body 40b shown in FIG.13 has a side wall 41b in the form of a cylindrical shell passing over by a wane into a cone 43b.
  • the directing body 40c shown in F1614 is constituted 'by a side wall 41c in the form of a frusto-conical shell, of which the larger circular base is situated adjacently to the rear wall 28, said shell passing over by a wane into a cone 43c.
  • the arrangement of directing bodies 40a, 40b, and 400 shown in FIG.13 and F1014 reduces the withdrawing resistance of weft during operation and is adapted particularly for use with more rigid and thicker tape weft materials.
  • the helical air flow in drum 27 is constituted by mutual interaction of the position of axis 37 of injector l8 and the shape of the guiding surface 33 of drum 27.
  • the axis 37 of injector is normal to the surface line 38 of side wall 31 in the shape of a frusto-conical shell with a smaller base attached to the rear wall of drum 27.
  • the axis 37 of injector 18 forms with said surface line an angle alpha.
  • the axis of injector 18 forms with said surface line an angle alpha with the surface line 38 of side wall 31 in the shape of a cylinder.
  • a helical whirl arises by influence of centrifugal force by bending the fed air flow by guiding surface 33.
  • One of the components of centrifugal force causes axial deviation of the air flow, there thus arising an air helical flow on the guiding surface 33.
  • the slope, or the angle, respectively of the helix pitch, which represents the shape of the air flow path, is given by the conicity of the guiding surface 33.
  • the helical whirl is a consequence of the position of axis 37 of injector 18 in view of the appurtenant surface line of the cylindrical rotary guiding surface 33.
  • the slope of the air flow path is given by the slope of an imaginary helix, embracing the cylindrical guiding surface 33.
  • a helical air flow is created on the rear field 34 which directs weft 5 into the spatial spiral and, according to FIG.ll5, into a spatial helix.
  • FIG.15 an embodiment of magazine 1 for larger fabric widths is shown, that is, for longer weft lengths.
  • This embodiment is to increase the numher of windings of the spatial spiral or helix.
  • Drum 27' is constituted by the conventional rear wall 28, and a side wall 31 in the form ofa cylindrical shell which passes over by wane 60 into the front wall 29 in the form of a frusto-conical shell which is provided with an exit opening 30.
  • the guiding surface 33' which is substantially wider than the same surface in the magazine as shown in FIG.3, has a rear smooth field 34' and a front field 35 which is provided on a part of the surface with vents 36'.
  • the width of the rear field 34 is considerably larger than the width of the front field 35.
  • the tube of injector 18 opens obliquely in a tangential direction into side wall 31.
  • the directing body 40' which is constituted by a side wall 41' in the form of a frusto-conical shell, which is fastened with its larger circular base to the rear wall 28', the side wall 41' passing over by wane 42' into cone 43' which has an oblique top 44 situated on the axis of drum 27 (not shown). Between the directing body 40' and side wall 31' and the front wall 29' there is a gap 45. Between top 44 and exit opening 30 there is situated a gap 46.
  • a screw thread 62 of metal or a suitable plastic material On the rear field 34' of the guiding surface there is fastened by welding or cementing a screw thread 62 of metal or a suitable plastic material, the purpose of which is directing the air flow fed from the injector 18 into a helical flow. Between the top edge 63 of screw thread 62 and directing body 40' there is a passage 64 for weft 5 which is withdrawn from the spatial weft helix 47'. The width of passage 64 is substantially the same about the whole circumference of the screw thread 62.
  • the function of magazine 1 as shown in FIGJS is the same as that of magazine 1, as shown in FIG.3.
  • the weft fed into drum 27 by injector 18 is directed by the effect of the helical flow of air created by the surface of the screw thread 62 into the spatial weft helix 47, from which the insertion weft length is withdrawn in the weft inserting intervals.
  • the course of weft 5 in drum 27' immediately after weftinsertion is represented by reference numeral 5".
  • the weft is directed substantially straight from the mouth of injector 18 along the directing body 40' to the exit opening 30'.
  • the directing body 40b of inner drum 27b is constituted like a body, of which the form is similar to one of the forms as shown in FIGS.12 to 14.
  • the front wall 290' of outer drum 27a converges into the exit opening 30a and the front wall 29b of the inner drum 27b into neck 65b, at the end of which is an exit opening 30b.
  • the neck 65]) emerges from the exit opening 30a of the outer drum 27a.
  • the directing body 40b is separated from the side wall 31b and the front wall 29b by gap 45b. Between the directing body of the outer drum 27a, constituted by the side wall 31b and the front wall 29b of inner drum 27b, and side wall 31a and front wall 29a of outer drum 27a, gap 45a is situated.
  • Another embodiment is possible in which the exit opening 30b is at level with exit opening 30a.
  • the first embodiment advantageously secures separated guiding of the two wefts a, 5b.
  • the width of the guiding surface 33a is larger than the width of the inner guiding surface 33b.
  • the two front fields 35a, 3512 are arranged beside each other, however, a gap can be between them, of which the width depends on the difference of the widths of the two fields.
  • the two magazines 1a, 1b operate independently of each other. From the outer drum 270, the weft 5a is withdrawn via annulus 30a and from the inner drum 27b via circular exit opening 30b.
  • the advantage of this arrangement consists in the relatively small dimensions of the device.
  • FIGS.16 and 17 a separate pair of feeding rollers. 7, 8 must be used for each weft thread, such feeding rollers being constructed and arranged as shown in FIG.1. All such pairs of the feeding rollers 7, 8 may have a common drive, the individual yarn guides 14 being individually adjustable along the nip of the feeding rollers 7, 8. It should be noted that the feeding rollers 7, 8 are of frusto-conical shape, so that the speed of feeding the yarn may be varied by changing the position of the yarn guiding eye on the arm 14, as indicated by the double-ended arrow 17 in F IG.1.
  • FIGS.1824, inclusive particularly FIGS.18, 20, and 24, a separate pair offeeding rollers is also used for each weft thread.
  • Such feeding rollers are constructed and operated in the same manner as those shown at 7 and 8 in FIG.1.
  • FIG.16 An exemplary embodiment of the pair of magazines la,- lb as shown in FIG.16 is made according to a first alternative embodiment (FIGS.18 and 19).
  • FIGS.19 and 20 show further modifications of F 10.16.
  • the rear drum 27c is provided with a directing body 40c, injector 18c, inner guiding surface 330 and front wall 29c passing over into neck 65c, which is provided at its end with an exit opening 300.
  • the front drum 27d has a directing body40d', an injector 18d, a guiding surface 33d and a front wall 29d, which narrows into exit opening 30d.
  • the neck 650 projects from the exit opening 30d of front drum 27d.
  • the rear wall of the front drum 27d is the front wall 290' of the rear drum 27c.
  • Weft 5c is fed into magazine 10 by injector 18c and weft 5d into magazine 1d by injector 18d, In both magainzes 1c, 1d are constituted independent helical air flows, which direct the fed weft 5c, 5d into a spatial helix, from which the inserting length of weft is withdrawn through exit openings 30c, 30d".
  • each of magazines 1c, 1d is the same as in the embodiment shown in FIG.15.
  • FIG.19 which is a partial side view in the direction of arrow 66" in FIG.18, an oblique passing over of injec-' tor 18c, 18d into side walls 31c, 31d is obvious.
  • embodiments of the two magazines according to the modifications as shown in FIG.6 on the one hand and FIG.7 on the other are possible.
  • FIG.20 an axial section through the coaxial arrangement of four combined magazines 12, If, lg, 1h is diagrammatically shown, for weaving machines with four color weft changes.
  • This arrangement is substantially a combination of doubled magazines as shown in FIGS.16 and 18.
  • the device as shown in FIG.20 consists of a pair of rear magazines 1e, If and a front pair of magazines 1g, 1h, the embodiment of said pairs being substantially in accordance with the embodiment of pairs as shown in FIG. 16.
  • the front wall 29fof inner drum 27f which has together with the side wall 31f the function of an outer directing body of outer drum 27e, converges into neck 65fprovided at its end with exit opening 30f.
  • the front wall 29a of the outer drum 27e also converges into neck 65e provided at its end with exit opening 30c.
  • the front pair of magazines lg, 1h has an inner drum 27h, of which the side wall 31h and the front wall 29h form a directing body of outer drum 27g.
  • the front pair of magazines lg, 1h is arranged on the front wall 29a of outer magazine 1e of the rear pair of magazines 1e, 1 f, so that a part of said front wall 292 forms the rear wall for the front pair of magazines 1g, lh.
  • the front wall 29g of the outer magazine 1g narrows convexly in the direction into the exit opening 30g and the front wall 29h of the inner magazine 1h by a short neck 65h into the exit opening 30h. All outlet openings 30e, 30f, 30g are at one level.
  • a circular plate 67 is mounted at the level of exit openings 30e, 30f, 30g, 30h, in which are mounted in one row the exit openings 68, 69. 70, 71 for the wefts 5e, 5f, 5g, 5h as can be seen from FlG.2l, which represents the outlet part of the combined magazines in a view in the direction of arrow 72 from FIG.20.
  • the guiding openings 68, 69, 70 are only a little smaller than the guiding opening 71, which is at a level with the exit opening 30f of drum 27f.
  • each of the four magazines 1e, 1f, 1g, 1h operates independently of the others and makes of the fed weft yarns 52, 5f, 5g, 5h (not shown) spatial weft spirals, from which the weft inserting length is withdrawn through the outlet openings 30e, 30f, 30h via guiding eyelets 74, 75, 76, 77 to a weft inserting nozzle (not shown).
  • the helical air flow is formed of a pressure air flow fed in injector 18.
  • FIGS.22, 23 there is diagrammatically shown an embodiment of the magazine in which the pressure fluid is developed directly in the magazine 1k.
  • the magazine k1 includes a drum 27k constituted by rear wall 28k, side wall 31k in the form of a frustoconical shell, of which the smaller circular base is attached to the rear wall 28k and the front wall 29k has the form of a frusto-conical shell, which convexly narrows into exit opening 30k.
  • a directing body 40k which in the exemplary embodiment forms one assembly with the rear wall 28k in the cylindrical hollow 78 of directing body 40k.
  • a fan wheel 79 with blades 80 is arranged coaxially of drum 27k, said fan wheel being mounted on shaft 81 of a partially shown electric motor 82 which is mounted on a frame (not shown) of the weaving machine.
  • Shaft 31 passes through a circular sucking opening 83 which is made in the rear wall 28k of drum 27k. Magazine 1k is mounted by means of holders 84, e.g. to electric motor 82.
  • the inner guiding surface 33k is separated into two parallel fields 34k, 35k.
  • Feeding tube 85 opens tangentially into rear field 34k.
  • the side wall 41k of directing body 40k is in the shape of a cylindrical shell, and is provided throughout the whole circumference with channels 86, which are tangentially directed to a fan wheel 79, and their inclination is in accordance with the direction of rotation of the fan as indicated by arrow 87 (FIG.23).
  • the output of the fan, the number of channels 86, their cross-section and the inclination of the side wall 31k are chosen such that the created helical flow of air should direct the fed weft 5 into a spatial weft spiral 47 (FIG.23).
  • the channels 86 are directed either only against the rear field 34k or also into the front field 35k provided with vents 36k as in the exemplary embodiment shown in FIG.22.
  • the fan wheel 79 which is driven according to the exemplary embodiment by an electric motor 82, can be imparted rotary motion by a transmission from any rotating element of the weaving machine, e.g., the lower or upper shaft.
  • Weft 5 is fed into feeding tube 85, said weft being fed at an appurtenant adjusted speed by means of a feeding mechanism (not shown).
  • the device as shown in FIGS.22, 23 operates as follows:
  • a substantial advantage of this arrangement of the magazine as compared to magazines with an injector air feeding is that they operate without a pressure air source, this being particularly valuable upon applying the device according to the present invention in a weaving machine with hydraulic weft insertion. It is economical to apply a magazine as shown in FIGS.22, 23 also in weaving machines with pneumatic weft insertion where the consumption of pressure air is diminished.
  • FIG.24 a device according to the present invention is diagrammatically shown, including the combination of two magazines [1, lj for shuttleless weaving machines with a two color weft change.
  • the device consists of an outer magazine 1i and an inner magazine lj.
  • the outer drum 271 which is substantially of the same construction as drum 27 in FIG.22, is constituted by the rear wall 281', the side wall 311' in the form of a frusto-conical shell, of which the smaller circular base is attached to the rear wall 281 and the front wall 291, also in the form of a frusto-conical shell, which narrows convexly into exit opening 30i.
  • a directing body 401' Inside drum 271' there is mounted a directing body 401' in the cylindrical hollow 78 of which is mounted a fan wheel 79 mounted on shaft 81' of electric motor 82. Shaft 81' projects through the circular sucking opening 83 from drum 27i, which is fastened by holders 84' to electric motor 82. Into the rear field of the inner rotary v guiding surface 33i there opens tangentially the feeding tube 851', in which weft 51 is threaded. In the side wall 4li of the directing body 401' there are arranged channels 86'.
  • the inner drum 27] consists of a rear wall 28j in the form of an annular surface, the side walls 31j in the form of a frusto-conical shell of which the smaller circular base is attached to the rear wall 28] and the front wall 29], which converges into exit opening 30] which is parallel with the exit opening 30i.
  • the side wall 311' is provided with vents 36i and side wall 31j with vents 36j.
  • the rear wall 28j longitudinally separates the channels 86 into two parts, of which the rear part is directed against the rear wall 341' of the inner rotary guiding surface 33i of the outer drum 27i and the front part against the rear wall 34j of the inner rotary guiding surface 33j of the inner drum 27j.
  • the side wall 31j and the front wall 29j of inner drum 27j constitute a directing body of the outer drum 27i.
  • the directing body of the inner drum 27j is a cone 43 and a part of the side wall 41 of the directing body 40.
  • the feeding tube 85j opens tangentially into the side wall 3Ij of the inner drum 27j, weft 5j being threaded into said feeding tube which passes through the side wall 31j of the outer drum 27i.
  • the device as shown in F1624 operates as follows:
  • blades 80' By rotary motion of the fan wheel 79', blades 80' suck in air from the ambient atmosphere through sucking opening 81 in the direction of arrows 87 and press said air through channels 86 in the direction of arrows 88' tangentially, on one hand, against the rear field 341' of the inner guiding field 34 of the inner guiding surface 33j of inner drum 27j.
  • both drums 27i, 27j there is brought about a helical air flow which directs the fed wefts 5i, Sj into spatial spirals, of which the weft supply for one pick is withdrawn in the given sequence by guiding eyelets 90, 91.
  • the excessive air escapes through vents 36i, 36j.
  • Wefts 5i, 5] are fed in the given case at one-half the speed ofthe weft velocity in the embodiment as shown in FlGS.22, 23, and thus the measured weft supply for one pick is formed in the course of two reVolutions of the weaving machine.
  • Apparatus for preparing weft supply in a magazine for weft insertion in shuttleless looms by prolonging the yarn path by the action of an air flow in the magazine into which the weft is continuously fed upon being withdrawn from a supply bobbin, the weft being withdrawn from the magazine in weft inserting intervals in a length sufficient for one pick, comprising a weft feeding mechanism, a weft measuring mechanism, and a weft inserting mechanism, the weft measuring mechanism being arranged upstream of the weft inserting mechanism, means for continuously feeding the weft into the magazine upon being withdrawn from a supply bobbin, means for withdrawing the weft from the magazine in weft inserting intervals in a length sufficient for one pick, means for creating a helical air flow in the magazine which directs the fed weft into a spatial spiral and means for guiding axially the inserting length of weft from said spatial spiral.
  • each magazine comprises a hollow drum with a rear wall connected by a side wall to a front wall in the form of a convex surface of revolution providediri the 'middle with an exit opening for the weft, an injector which opens into the drum tangentially of the side wall for feeding pressure air into the drum, the drum having an inner annular guiding surface which directs the fed air flow into a spatial spiral.
  • said rotary guiding surface has two parallel annular fields of which the rear field into which the injector opens and a part of the front field constitute a path for the fed air flow, while the remaining part of the front field is provided with vents for the outlet of pressure air from the drum, and comprising a coaxial directing body in the hollow of the drum on the rear wall thereof, the directing body being of circular cross-section and guiding the withdrawn weft, said directing body being separated from the side wall and the front wall of the drum by a gap.
  • vents for the outlet of pressure air are distributed on at least a part of the circumference of the front field of the annular guiding surface.
  • Apparatus as claimed in claim '6 comprising another magazine mounted inside said magazine coaxially thereof, the side wall and the frontwall of the drum of the inner magazine constituting a directing body of the outer drum, an injector passing through the side wall of the outer drum, the injectors for the inner and outer drums being parallel, the outer drum having an annular guiding surface larger than the width of the annular guiding surface of the inner drum, the two front surfaces of the annular guiding surfaces being coaxial of the axis of the inner and outer drums, the front wall of the inner drum converging into a neck which is provided with an exit opening on its end, said opening being coaxial of and flush with the exit opening of the outer drum.
  • Apparatus as claimed in claim 6, comprising a second magazine coaxially attached to the first recited magazine in such manner that the two magazines are arranged one behind each other, the rear wall of the front drum being the front wall of the rear drum, the wall of the rear drum converging into a neck with an exit opening at its end, said exit opening being flush with an exit opening of the front drum.
  • Apparatusas claimed in claim 6, comprising a screw thread on the rear field of the annular guiding surface for directing the fed air flow into a spatial spiral, there being a passage between the top edge of the annular guiding surface and the directing body for the withdrawn weft.
  • the weft inserting mechanism includes a nozzle for pneumatic or hydraulic weft insertion
  • the magazine is a substantially hollow drum with a rear wall provided with at least one sucking opening and connected with the front wall in the form of a convex surface of revolution provided with an exit opening amidst for the weft
  • the drum having a side wall of which the inner annular guiding surface is in the form of a frusto-conical shell attached with its smaller circular base to the rear wallof the drum which constitutes a path for the air flow and has two parallel fields of which the rear field into which there opens tangentially the feeding tube for the weft withdrawn from the feeding mechanism is a smooth surface
  • the front field is at least at a part of its surface provided with vents for the exit of air from the drum, within the drum and on the rear wall thereof there being arranged parallel with the drum a fan wheel surrounded by the wall of a directing body of circular cross-section for the withdrawn weft, said directing
  • channels being directed toward the annular guiding surface of the side wall to directing the' partial air flows from channels into the helical air flow.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00278630A 1971-08-05 1972-08-07 Method of and apparatus for preparing a weft supply in a magazine for weft insertion in shuttleless looms Expired - Lifetime US3799211A (en)

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US05/669,724 USRE30318E (en) 1971-08-05 1976-03-23 Method of and apparatus for preparing a weft supply in a magazine for weft insertion in shuttleless looms

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CS569271A CS153859B1 (hu) 1971-08-05 1971-08-05

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JP (1) JPS5620377B2 (hu)
CH (1) CH550268A (hu)
CS (1) CS153859B1 (hu)
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916935A (en) * 1973-06-08 1975-11-04 Rueti Ag Maschf Apparatus for the storage of weft threads
US3918501A (en) * 1973-06-21 1975-11-11 Du Pont Canada Feeder for tape weaving machine
US4108216A (en) * 1974-11-11 1978-08-22 Wueger Karl W Yarn dispensing apparatus for a loom and the method thereof
US4197882A (en) * 1977-08-18 1980-04-15 Nissan Motor Company, Limited Fluid jet shuttleless loom with resistance providing means for weft yarn
US4753274A (en) * 1984-08-23 1988-06-28 Elitex Koncern Textilniho Strojirenstvi Method of and apparatus for inserting weft threads
US4821781A (en) * 1986-10-31 1989-04-18 Picanol N.V. Weft accumulating method and assembly for weaving machines
CN103981619A (zh) * 2014-05-26 2014-08-13 苏州东茂纺织实业有限公司 一种漩涡式捕纬装置
CN105671755A (zh) * 2016-04-15 2016-06-15 苏州市丹纺纺织研发有限公司 一种气流式捕纬装置

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288803A1 (fr) * 1974-07-31 1976-05-21 Moessinger Sa Procede et dispositif de tissage avec insertion par boucle
US4033384A (en) * 1974-08-26 1977-07-05 Crompton & Knowles Corporation Means for and method of supplying weft yarn to an outside filling supply loom
JPS52155258A (en) * 1976-06-18 1977-12-23 Tsudakoma Ind Co Ltd Weft reservoir for shuttleless loom
NL7610385A (nl) * 1976-09-17 1978-03-21 Rueti Te Strake Bv Pneumatische weefmachine, alsmede daarvoor bestemde inslagtransporteur.
CH635146A5 (de) * 1979-03-01 1983-03-15 Sulzer Ag Vorrichtung zur messung von fadenfoermigem material.
WO1981002591A1 (en) * 1980-03-05 1981-09-17 Bonas Machine Co Weft projection means
JPS63168500A (ja) * 1986-12-27 1988-07-12 カネボウ株式会社 固形洗浄剤組成物
JPH0541593Y2 (hu) * 1987-01-27 1993-10-20
CN117663995B (zh) * 2024-01-31 2024-04-02 中交天航南方交通建设有限公司 一种吹填管线测量装置

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US3303857A (en) * 1963-08-09 1967-02-14 Scheffel Walter Loom with pneumatic picking means
US3477476A (en) * 1968-02-26 1969-11-11 Leesona Corp Storage device
US3580444A (en) * 1967-09-04 1971-05-25 Strake Maschf Nv Device for localizing an excess in length in a thread

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GB1183934A (en) * 1966-03-30 1970-03-11 Weaving Res & Textile Commissi Improvements in and relating to Looms

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303857A (en) * 1963-08-09 1967-02-14 Scheffel Walter Loom with pneumatic picking means
US3580444A (en) * 1967-09-04 1971-05-25 Strake Maschf Nv Device for localizing an excess in length in a thread
US3477476A (en) * 1968-02-26 1969-11-11 Leesona Corp Storage device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916935A (en) * 1973-06-08 1975-11-04 Rueti Ag Maschf Apparatus for the storage of weft threads
US3918501A (en) * 1973-06-21 1975-11-11 Du Pont Canada Feeder for tape weaving machine
US4108216A (en) * 1974-11-11 1978-08-22 Wueger Karl W Yarn dispensing apparatus for a loom and the method thereof
US4197882A (en) * 1977-08-18 1980-04-15 Nissan Motor Company, Limited Fluid jet shuttleless loom with resistance providing means for weft yarn
US4753274A (en) * 1984-08-23 1988-06-28 Elitex Koncern Textilniho Strojirenstvi Method of and apparatus for inserting weft threads
US4821781A (en) * 1986-10-31 1989-04-18 Picanol N.V. Weft accumulating method and assembly for weaving machines
CN103981619A (zh) * 2014-05-26 2014-08-13 苏州东茂纺织实业有限公司 一种漩涡式捕纬装置
CN105671755A (zh) * 2016-04-15 2016-06-15 苏州市丹纺纺织研发有限公司 一种气流式捕纬装置

Also Published As

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JPS5620377B2 (hu) 1981-05-13
NL175740C (nl) 1984-12-17
GB1378059A (en) 1974-12-18
DE2237068A1 (de) 1973-02-15
CH550268A (de) 1974-06-14
FR2148307B1 (hu) 1974-12-27
NL7210726A (hu) 1973-02-07
NL175740B (nl) 1984-07-16
JPS4828764A (hu) 1973-04-16
DE2237068C2 (de) 1982-08-26
FR2148307A1 (hu) 1973-03-11
CS153859B1 (hu) 1974-03-29

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