US3367372A - Device for storing a length of weft thread and introducing it into a shed - Google Patents

Device for storing a length of weft thread and introducing it into a shed Download PDF

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Publication number
US3367372A
US3367372A US527700A US52770066A US3367372A US 3367372 A US3367372 A US 3367372A US 527700 A US527700 A US 527700A US 52770066 A US52770066 A US 52770066A US 3367372 A US3367372 A US 3367372A
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US
United States
Prior art keywords
thread
section
shaft
channel
shed
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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
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US527700A
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English (en)
Inventor
Fransen Theodorus
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.)
Machinefabriek L te Strake NV
Original Assignee
Strake Maschf Nv
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Filing date
Publication date
Application filed by Strake Maschf Nv filed Critical Strake Maschf Nv
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Publication of US3367372A publication Critical patent/US3367372A/en
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Expired - Lifetime legal-status Critical Current

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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

  • a device for storing a length of weft thread and introducing it into a shed comprising a shaft adapted to take up by suction a measured length of weft thread in the form of a loop, a channel forming an extension of the shaft, an opening between the shaft and the channel through which a loop of weft thread may be drawn into the shaft, a blowing nozzle associated with the outer end of the channel arranged to blow air outward adjacent such end of the channel, thereby drawing secondary air into such opening and into the channel, to draw a free end of the loop of weft thread into the opening and through the channel and blow it into the shed, a stamp arranged to engage the loop of weft thread at a point adjacent to a portion of the weft thread which has been blown into the shed, a mechanism for holding the stamp in clamping engagement with the thread while the free end of the loop is being drawn through the channel and blown into the shed and then releasing the stamp from the thread to permit the
  • the invention relates to a blowing device for blowing a weft thread into the shed of a loom by means of air under pressure, which blowing device possesses a nozzle for the air under pressure and a channel for presenting a i measured length of a thread to the nozzle, which thread is drawn from a thread package.
  • each thread having a measured length is to be blown into the shed in two steps. Firstly the first leg of the hairpin like weft is blown into the shed, and after the shed is changed, when the second leg of the hairpin like weft is ready to be blown into the shed, the portion of the thread leading back from the first leg runs through the blowing device and the associated channel for presenting the thread to the blowing device.
  • the object of the invention is to remove this drawback so that the dimensions of the channel can be made as small as possible, without the possibility that the thread may become entangled as a result of touching of both thread parts in the channel.
  • the stamp is situated at a place where a part of the thread runs, which leads back from the leg that is already blown into the shed.
  • this part of the thread is clamped by the stamp the part of the thread which runs from the clamp to the fabric is tensioned owing to which this part cannot become entangled with the part of the weft which is to be blown into the shed.
  • the clamping action of the stamp is released.
  • the invention allows the use of very narrow channels, which can have a cylindrical cross section with a relatively small diameter near the blowing nozzle without the possibility that a thread may become entangled.
  • a very strong air stream can be created in this channel by the provision of the narrow cross section of the channel near the blowing nozzle.
  • the invention is very appropriate for a loom in which a channel for presenting a thread possesses a suction opening which can be closed by a valve at its end remote from the blowing nozzle and the passage of the channel is adapted as a flat slot having a dumbbell cross section.
  • the fiat slot can merge into a channel having a round cross section.
  • the stamp is situated near one of the edges of the flat slot at that place where the slot has a larger cross section than the central part of the slot between these edges.
  • the stamp When the channel is provided with a suction opening for the thread at its side the stamp is situated at that side of the internal space of the channel remote from the suction opening.
  • FIG. 1 is a longitudinal horizontal section of a blowing device according to the invention
  • FIG. 2 is a fragmentary vertical section through a channel showing a stamp in position for releasing a thread extending through the channel;
  • FIG. 3 is a section similar to that of FIG. 2 showing the stamp in position for clamping a thread
  • FIGS. 4-7 are diagrammatic representations of a blowing device according to FIG. 1 in plan view, in which the successive steps of presenting of a weft are incidated;
  • FIG. 8 is a perspective View of a loom provided with a device embodying the invention.
  • the blowing device consists of an annular nozzle 1 of a conventional type, which is positioned around a central supply channel 2 for a thread and for conducting secondary air.
  • a mixing tube 3 is situated in a known manner in front of the nozzle 1, which mixing tube preferably is provided with a slot 4 to accommodate the A-section of a weft thread.
  • A-section of a weft thread is meant the first leg of a measured length of weft thread, which is blown into the shed.
  • the B-section of the weft'thread is the second leg of the thread, which is to be blown into the shed later, resulting in a hairpin like formation of the weft woven in the fabric.
  • the central channel 2 merges into a widened part 2a and further it merges into a channel 2b of a flat shaft 212 of which the internal space is adapted to take up a loop of a thread.
  • the interior of the flat shaft 212 has a symmetrical dumbbell shaped cross section and is a narrow slot having widened edges. A part of this slot is shown in FIGS. 2 and 3, in which the narrow central part is indicated by 2b and the widened edge with 2b".
  • the shaft 2b is adapted for sucking up a measured length of a thread in the shape of a loop, which thread is drawn from a thread package 14 (FIG. 8).
  • FIG. 8 shows the shaft 2b in its entirety.
  • the lower portion of the shaft 2b is arranged in a verticalposition to conserve space, and is secured to the side plate 16 of the frame of a conventional type of loom shown in FIG. 8.
  • the upper portion of the shaft 2b which is shown in FIG. 1, extends horizontally.
  • a narrow slot or channel which has a dumbbell-shaped cross section, and this channel possesses a suction opening at its end remote from the blowing nozzle, which opening is controlled by a valve, as hereinbefore described under Summary of the Invention.
  • FIG. 8 shows that the thread passes from the auxiliary shaft 17 into the shaft 2b and then to the blowing nozzle and the mixing tube 3.
  • FIGS. 4, 5, 6 and 7. The next operation of a conventional pneumatic loom consists in blowing the B-section of the thread into the shed.
  • This blowing operation is illustrated in FIGS. 4, 5, 6 and 7.
  • the valve through which a vacuum is applied to the remote end of the shaft 2b is closed, and air under pressure is supplied to the annular blowing nozzle 1, for example through a tube 18.
  • the valves for supplying compressed air and for applying a vacuum to the tubes which lead to various parts of the apparatus are located in a valve housing 19, and each valve is opened and closed at the proper stages by a cam which operates the valve actuator and which is located on a camshaft 20.
  • the operation of the clamp must be timed in accordance with the speed with which the thread is supplied by the rollers 15 so that the thread is of the proper length between the clamp and the severed end of the thread supply.
  • the suction 1s cut off from the shaft 2b and compressed air is supplied to the blowing nozzle.
  • the severed end of the thread supply which has been clamped in the cutting device as illustrated in FIG. 3 of U.S. Patent Number 3,137,322 is released so that it is drawn into the opening 5 and is carried into the stream of air leaving the blowing nozzle. This stage corresponds to that illustrated in FIG. 1 of U.S. Patent Number 3,137,322.
  • the cutting device operates, in proper timed relation with the rate at which the thread is supplied by the rollers 15, to sever the B- section of the weft thread from the thread supply.
  • a new cycle then proceeds as hereinbefore described.
  • the present invention comes into operation only during the stage illustrated in FIGS. 4, 5, 6 and 7, which stage is the blowing of the B-section of the weft thread into the shed.
  • stage is the blowing of the B-section of the weft thread into the shed.
  • the A-section of the weft thread is blown into the shed and the adjoining portion of the thread, which extends back through the blowing nozzle and out of the opening 5 to the clamp that is located between the shafts 2b and 17 is placed under tension as hereinbefore described.
  • the supply of compressed air to the blowing nozzle is cut off, the clamp is released, and suction applied to the shaft 2b pulls more thread through the opening 5 to form a loop of thread in the shaft 2b as shown in FIGS. 1 and 4.
  • a stamp 6 is situated in the shaft 2b.
  • the stamp 6 possesses a stem 7 provided with a head 8 bearing on a lever 9, which has its central portion pivoted beneath a frame member 21 and has its two arms offset vertically as shown in FIG. 8.
  • One of the arms of the lever 9 bears against the head 8 of the stamp 6, and the other arm bears upon a cam 22 on the camshaft 20, which is driven by a rotating part of the loom.
  • the lever 9 in FIG. 2 is situated in such a position that the arm adjacent to the stamp 6 is elevated and the other arm bears upon a low spot on the cam 22, so that the through path of the channel 2b" is entirely free; that is a shoulder 10 of the stamp 6 is situated out of the path through the channel 212.
  • the shoulder 10 is oval in horizontal section, as shown in FIG. 1, and fits in a recess 11 which is provided in the upper side of the shaft 2b and which is oval in horizontal section to receive the oval shoulder of the stamp.
  • a compression spring 12 is situated behind the head 8. The spring 12 presses down the head 8 when the lever 9 moves downwardly, owing to which the shoulder 10 of the stamp 6 will rest on the bottom of the channel 2b". If now a thread is present in the part 2b" of the channel this thread is clamped under the shoulder 10 on the bottom of the channel.
  • the stamp 6 is provided with a knob 13 for manually elevating the stamp e.g. when the loom is not operative and a thread which remains under the shoulder 10 of the stamp is to be removed by hand.
  • the .fabric is diagrammatically drawn at the left side of FIG. 4.
  • the A-thread and the B- thread of the hairpin shaped wefts, which are woven into the fabric are also indicated.
  • an A-thread is blown into the shed and is beaten into the fell by the reed an adjoining part of the thread runs to the blowing device, because a B-section of the thread is still to be blown into the shed. That part of the thread which remains in the mixing tube will be a part of the B-section after its insertion.
  • the B-section is sucked into the shaft 2b in the shape of a loop through the opening 5 when vacuum is applied at the remote end of the shaft 2b, because the vacuum causes air to flow rapidly inward through the opening 5 and through the channel 2.
  • the thread runs directly from the notch 4 to the opening 5 and is not clamped outside of the opening 5.
  • the stamp 6 is now in a position as shown in FIG. 2 in which the path through the channel 2b" is entirely free. This position is indicated by a circle in FIG. 4.
  • This free end is the free end of the B-section of the weft thread.
  • the mechanism In every pneumatic loom, before the B- section of the weft thread can be blown into the shed, the mechanism must sever the B-section of the weft thread from the thread supply, as indicated in FIG. 3 of US. Patent Number 3,137,322. This severing operation occurs at the stage illustrated in FIG. 4, and the end of the B- section of the thread which extends out of the opening 5 is free after the severing operation. Then when air under pressure is blown out of the nozzle .1, the valve for applying suction to the shaft 2b is closed, so that the shaft 2b constitutes a dead air space and the opening 5 is the only source through which secondary air can enter the channel 2.
  • FIG. 6 shows the desired proper action of the thread in solid lines, and shows in dotted lines the undesired entr-ainment of the portion of the thread which should remain undisturbed.
  • FIG. 7 shows also in solid lines the desired action of the thread, and shows in dotted lines the undesired tangled condition of the B-section of thread which would prevent the B-section of thread from extending straight into the fabric and from reaching entirely across the fabric as desired.
  • the clamp 6 operates to prevent the undesired action of the thread which is shown in dotted lines in FIGS. 5, 6 and 7, and to produce the desired action of the thread which is shown in solid lines, in the following manner: At the moment or shortly before the moment when air under pressure streams out of the blowing device, the cam 22 actuates the lever 9 so that the stamp 6 moves downwardly and the part of the B-section which leads to the A-section of the thread is clamped. This situation is indicated by a solid dot at the stamp 6 in FIG. 5.
  • the B-t-hread is entirely blown into the shed and the situation shortly before the B- thread leaves the shaft 2b is indicated in FIG. 6.
  • the stamp 6 is about to free the thread.
  • the cam 22 then actuates the lever 9 to move the stamp 6 to the position shown in FIG. 2.
  • the stamp 6 has entirely freed the channel 2b in FIG. 7 and the last part of the loop of the B-thread leaves the mixing tube 3.
  • a device for storing a length of weft thread and introducing it into a shed comprising a shaft adapted to take up by suction a measured length of weft thread in the form of a loop, a channel forming an extension of the shaft, an opening between the shaft and the channel through which a loop of weft thread may be drawn into the shaft, and a blowing nozzle associated with the outer end of the channel and arranged to blow air outward adjacent such end of the channel, thereby drawing secondary air into such opening and into the channel, to draw a free end of the loop of weft thread into the opening and through the channel and blow it into the shed, wherein the improvement comprises a stamp arranged to to engage the loop of weft thread at a point adjacent to a portion of the weft thread which has been blown into the shed, and mechanism for holding the stamp in clamping engagement with the thread while the free end of the loop is being drawn through the channel and blown into the shed and then releasing the stamp from the thread to permit the last portion of the loop to be
  • a device wherein the interior of the shaft is a flat slot having a dumbbell-shaped cross section which is wider adjacent the edges of the slot, and
  • vthe stamp is arranged to enter one of the wider edge the wider edge portions of the slot and the stamp is arportions of the slot to clamp a thread that extends through 'ranged to enter the other edge P ⁇ ion of the s-uch edge portion.
  • a device wherein the opening No references clted' between the shaft and the channel is adjacent to one of 5 HENRY S JAUDON, P i E min r,

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Saccharide Compounds (AREA)
US527700A 1965-02-19 1966-02-16 Device for storing a length of weft thread and introducing it into a shed Expired - Lifetime US3367372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6502157A NL6502157A (US06589383-20030708-C00041.png) 1965-02-19 1965-02-19

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US3367372A true US3367372A (en) 1968-02-06

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US527700A Expired - Lifetime US3367372A (en) 1965-02-19 1966-02-16 Device for storing a length of weft thread and introducing it into a shed

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US (1) US3367372A (US06589383-20030708-C00041.png)
BE (1) BE675864A (US06589383-20030708-C00041.png)
CH (1) CH441170A (US06589383-20030708-C00041.png)
DE (1) DE1535549C3 (US06589383-20030708-C00041.png)
GB (1) GB1130503A (US06589383-20030708-C00041.png)
NL (1) NL6502157A (US06589383-20030708-C00041.png)
NO (1) NO119308B (US06589383-20030708-C00041.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080156390A1 (en) * 2004-07-30 2008-07-03 Lindauer Dornier Gesellschaft Mbh Jet-Weaving Machine, Particularly an Air Jet-Weaving Machine, with a Clamping Device in the Mixing Tube
US20090065089A1 (en) * 2007-09-10 2009-03-12 Sultex Ag Cutting Apparatus For A Weaving Machine And Method For The Operation Of The Same
US20090288732A1 (en) * 2006-06-02 2009-11-26 Lindauer Dornier Gessellschaft Mbh Method for clamping a weft thread in a jet weaving machine, in particular air-jet weaving machine, clamping device and jet weaving machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2283762B (en) * 1993-11-11 1997-03-26 Fabio Botturi Yarn feeding device for a loom

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080156390A1 (en) * 2004-07-30 2008-07-03 Lindauer Dornier Gesellschaft Mbh Jet-Weaving Machine, Particularly an Air Jet-Weaving Machine, with a Clamping Device in the Mixing Tube
US7537029B2 (en) * 2004-07-30 2009-05-26 Lindauer Dornier Gesellschaft Mbh Jet-weaving machine, particularly an air jet-weaving machine, with a clamping device in the mixing tube
CN101023208B (zh) * 2004-07-30 2011-05-25 林道尔·多尼尔有限责任公司 喷气织机，尤其是在混合管中具有一个夹持装置的空气喷射织机
US20090288732A1 (en) * 2006-06-02 2009-11-26 Lindauer Dornier Gessellschaft Mbh Method for clamping a weft thread in a jet weaving machine, in particular air-jet weaving machine, clamping device and jet weaving machine
US7753084B2 (en) * 2006-06-02 2010-07-13 Lindauer Dornier Gesellschaft Mbh Method for clamping a weft thread in a jet weaving machine, in particular air-jet weaving machine, clamping device and jet weaving machine
US20090065089A1 (en) * 2007-09-10 2009-03-12 Sultex Ag Cutting Apparatus For A Weaving Machine And Method For The Operation Of The Same

Also Published As

Publication number Publication date
DE1535549A1 (de) 1971-01-07
NL6502157A (US06589383-20030708-C00041.png) 1966-08-22
CH441170A (de) 1967-07-31
DE1535549C3 (de) 1974-06-06
NO119308B (US06589383-20030708-C00041.png) 1970-04-27
BE675864A (US06589383-20030708-C00041.png) 1966-06-16
DE1535549B2 (de) 1973-11-08
GB1130503A (en) 1968-10-16

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