US3451437A - Device for launching a thread by jet action of a fluid to be used in conjunction with a loom - Google Patents

Device for launching a thread by jet action of a fluid to be used in conjunction with a loom Download PDF

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Publication number
US3451437A
US3451437A US652978A US3451437DA US3451437A US 3451437 A US3451437 A US 3451437A US 652978 A US652978 A US 652978A US 3451437D A US3451437D A US 3451437DA US 3451437 A US3451437 A US 3451437A
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Prior art keywords
thread
fluid
jet
nozzle
needle
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Expired - Lifetime
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US652978A
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English (en)
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Hubert Peter Van Mullekom
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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

Definitions

  • the invention relates to a device for launching a thread by jet action of a fluid under pressure, which device is provided with a jet nozzle and a movable member, which member, being movable between two end positions with respect to the jet nozzle, is adapted for presenting a thread to this jet nozzle. Further the movable member in one end position cooperates with the jet nozzle in such a manner that the thread will enter the jet nozzle.
  • Such a device is adapted to be used in conjunction with a loom in which a weft is to be inserted into the shed by jet action of a fluid under pressure. Usually air under pressure is used and the thread is blown into the shed. A liquid, such as water, can, however, be used alternatively for weft insertion.
  • a device for launching a thread is characterized in that the movable member previously referred to is provided with a discharge opening for a fluid, which discharge opening is positioned in such a manner that a jet of the fluid leaving it is directed towards the path of the jet of the jet nozzle and impinges on the thread inserted into the jet nozzle.
  • the movable member preferably forms a component of the jet nozzle when the thread is launched.
  • the movable member has the form of a hollow needle, the point of which is centrally positioned within the jet nozzle in one end position of said member and is provided with a seat for the thread which extends in front of the needle point.
  • the fluid which can flow through the hollow needle may be used as the primary fluid of the jet nozzle.
  • the movable needle forms the main component of the jet nozzle.
  • the point of the needle may be provided with a collar-like head which tits in a central part of the hopper-shaped jet nozzle, leaving an annular slot between this head and the inner circumferential wall of the hopper-shaped part of the blowing nozzle.
  • a secondary fluid e.g. the surrounding air
  • a primary, secondary and tertiary fluid can be used in the jet nozzle.
  • the point of the needle may be arranged to fit in a central passage of an annular nozzle.
  • the fluid which flows through the needle can be considered as a primary fluid and the fluid which streams out of the annular slot can be considered as a secondary fluid.
  • the tertiary fluid can be the surrounding air which enters the blowing nozzle through the central passage surrounding the needle.
  • the needle cooperates with a jet device and an initial velocity can be imparted to the thread'in a mechanical manner during the movement of the needle, while a jet action is also exerted on the thread.
  • a further advantage of the invention is that it makes possible the use of a fluid having a higher density than that of the gas or air used to form the jet, e.g. a liquid.
  • this may be achieved by connecting the interior of the hollow needle to one or more supplies of fluids having a diflerent density.
  • a liquid e.g. a drop of water
  • the drop of water which comes into contact with the thread, prevents the thread from being blown apart by the air under pressure. The possibility of destruction of the thread is now decreased.
  • FIG. 1 is a perspective view, partly broken away, showing a loom provided with a device for launching a weft into the shed of the loom;
  • FIG. 2 is a fragmentary longitudinal section of a device for launching a thread by jet action of a fluid under pressure, illustrating an axially movable hollow needle in its fully advanced position and the operation of means for discharging primary and secondary air into a nozzle;
  • FIG. 3 is a fragmentary longitudinal section of a simplified embodiment of a device according to FIG. 2 showing the hollow needle withdrawn from the nozzle;
  • FIG. 4 is a view corresponding to that of FIG. 3 showing the needle in the fully advanced position and also showing means for introducing a small quantity of liquid into the hollow needle;
  • FIG. 5 is a longitudinal section of a device similar to that shown in FIG. 2, showing how the blowing nozzle can co-operate with a shaft for temporarily storing a measured length of a thread.
  • the device according to the invention can be used in conjunction with any apparatus in which a thread has to be launched, its most advantageous use is in conjunction with looms in which a weft is adapted to be inserted into the shed by jet action of a fluid, because a weft must be accelerated from its stationary condition to a very high speed.
  • FIG. 1 shows a loom of this character in which a thread 1 is drawn from a stationary thread package 2 by means of continuously rotating conical rollers 3 and 4.
  • the speed of rotation of those rollers 3 and 4 depends on the production speed of the loom and the thread can be located at a definite position on the circumference of the conical roller 3 by means of an adjustable thread guide 5 in order to match the speed of the thread with that required for supplying to a device for making up a weft.
  • the device for making up a weft comprises a shaft or storage space 6 for taking up a periodical surplus of the thread 1. Further a shaft or channel 7 is provided in which a thread is temporarily stored in the shape of a loop. Thread clamps and thread guides co-operate with the shafts 6 and 7 in order to obtain a measured length of the thread 1 which is to be stored in the shaft 7. The thread clamps and thread guides are not indicated, because they are not a part of the invention.
  • the shaft 7 co-operates with a jet nozzle 8 for projecting the measured length of the thread out of the shaft 7 into the shed.
  • a jet nozzle and a device for making up a weft are situated also at the other side of the shed.
  • the additional jet nozzle provided in this case is indicated by the reference numeral 8a.
  • air under pressure is used as a fluid for creating the jet action and for conveying the thread into the shafts and the supply of air to the appropriate parts of the device for making up a weft is controlled by means of valves 9, which in turn are controlled by means of a cam shaft 10.
  • the cam shaft 10 is driven by the main shaft of the loom.
  • a guide 11 mounted on the shaft 7 is located in parallel alignment with the axis of the jet nozzle 8. The guide 11 is adapted to receive a movable member and the purpose and operation if this movable member will be described later with reference to FIGS. 2 to 5.
  • annular slot 13 is provided within a mixing tube 12.
  • This annular slot actually forms the jet nozzle for a fluid such as air, which streams out of an annular chamber 14.
  • the allnular chamber 14 situated around a hopper-shaped wall 15 defining a central passage 16 for secondary air and for a thread 1.
  • the annular chamber 14 is connected to a source 18 of fluid under pressure by means of a line 17.
  • a control valve 19 situated in the line 17 is arranged to be operated by a member (not shown) which runs synchronously with a main shaft of a machine such as a loom.
  • the fluid By opening the control valve, the fluid is admitted to the nozzle at the desired moment so that it issues in the form of a jet from the annular slot 13.
  • the fluid which streams out of the annular slot 13 will be mixed with air which enters the mixing tube through the central 4 passage 16 and a strong jet of the mixture will leave the mixing tube 12.
  • the presentation of the thread 1 to the jet streaming out of the annular slot 13 is performed in a special manner.
  • a thread 1 extending behind the central passage 16 and having its leading end 1a clamped in a thread clamp 1b (shown in FIG. 3) located behind this passage 16 can be engaged by the front end of a movable member 20, as the member 20 moves toward the jet nozzle 8.
  • FIG. 3 shows the thread 1 being engaged in a similar manner by the front end of a movable member 20a.
  • the movable member 20 is provided with a V-shaped notch 21.
  • the movable member 20 which has the form of a hollow needle, is reciprocated between two end positions by driving means (not shown) which are synchronised with a moving part of the machine on which the device is mounted.
  • the movable member 20 may, for example, be driven by means of the cam shaft 10 in a loom according to FIG. 1.
  • the thread which extends in front of the hollow needle constituting the movable member 20 enters the notch 21 when the hollow needle moves towards the outlet end of the nozzle 8. Further a thread clamp 1b (shown in FIG. 3) is released so that the leading end 1a of the thread becomes free.
  • the first part of the thread in the notch 21, is bent around the needle 20 and such an arrangement of the thread is advantageous, because the jet issuing from the annular slot 13 has a good grip on this end of the thread.
  • a fluid can also flow through the interior of the needle 20.
  • the Wall of the hollow needle may be provided with a lateral opening 22, which co-operates with an inlet opening 23 in the guide 24 for the needle.
  • the inlet opening 23 is connected to a source 18 of fluid under pressure by means of the line 25. It is obvious that, as soon as the opening 22 in the wall of the hollow needle 20 coincides with the inlet opening 23, the fluid will stream out of the point of the hollow needle.
  • the jet created in this manner will engage that part of the thread which extends across the notch 21 of the needle thus launching the thread.
  • the thread has already an initial speed as a result of the movement of the needle 20, the possibility of blowing apart the leading end of the thread by the jet streaming out of the needle 20 is decreased.
  • the jet passing through the needle need not 'be so strong for launching the thread as in the case where the thread has no initial speed at all.
  • the commencement of launching of the thread can be considered in three steps, i.e. a first initial speed imparted to the thread by the forward movement of the needle 20, a second initial speed which is imparted by the jet leaving the hollow needle and a third initial speed or acceleration which is obtained as soon as the thread comes into contact with the strong jet issuing from the annular slot 13-. These three steps of initial speed are so close together that they can be considered as only one step.
  • the jet nozzle can be of very simple construction as shown in the FIGURES 3 and 4.
  • the jet nozzle is formed by a hopper-shaped solid of revolution 15a and the hollow needle 20a possesses near its point a collar-shaped head 26.
  • the point of the needle 20a is formed with a V-shaped notch 21 in which the thread 1 can fit.
  • the collar-shaped head 26 tapers inwardly towards the point of the needle 20a.
  • the head 26 is tapered in such a manner that an annular slot is left between the inner surface of the hopper-shaped solid of revolution 15a and this tapered part of the head 26 when the hollow needle 20a is in one of its extreme end positions in the jet nozzle 8, as indicated in FIG. 4.
  • the thread together with secondary air can be supplied through this annular slot.
  • the hollow needle is provided with an additional inlet 27, as indicated in FIG. 4.
  • a drop of water can be injected into the hollow needle through this inlet 27, which drop of water will be discharged from the hollow needle together with air.
  • the drop of water will moisten the part of the thread 1 which rests in the notch 21, and such moistening will cause the fibers in the thread to adhere together more strongly, so that the structure of the thread will be less likely to be disrupted by the fluid which streams out of the hollow needle.
  • the jet nozzle 8 of FIG. 2 is provided with a shaft 7 in which a measured length of a thread is temporarily stored in the form of a loop.
  • the shaft 7 is positioned behind the hopper-shaped member 15.
  • the manner in which the thread is positioned in the flat channel-shaped internal space 28 of the shaft 7 will not be described, because the supplying of a thread to a shaft is generally known.
  • the loop enters the channel-shaped space 28 by jet action of a fluid, which fluid streams out of the nozzle 29.
  • the manner in which the hollow needle 20 is guided is clear from FIG. 5.
  • the lateral opening 22 of the hollow needle coincides with an inlet opening 23 from the valve 31.
  • a similar valve '31 is connected to the annular chamber .14 of the jet nozzle 8.
  • each valve disc 32 will be pressed on a seat 34 and air can flow around the circumference of the valve disc 32 to the chamber 33.
  • the capacity of thischamber 33 can be adjusted.
  • the pressure in the line 17a is relieved e.g. by means of a pressure-relief valve (not shown), the air stored in the chamber 33 will still be under pressure and therefore will begin to flow back toward the line 17a, thus flowing upward around the circumference of the valve disc 32.
  • a nozzle for discharging a jet of fluid, and a member "which is movable relative to the nozzle between two end positions, for presenting a thread to the nozzle, wherein the improvement comprises a discharge opening for a fluid, which is so located in the movable member as to discharge a jet of fluid in such a direction as to merge 'with the jet of fluid from the nozzle and to impinge upon the thread presented to the nozzle.
  • said movable member is in the form of a hollow needle, the point of which is positioned centrally within the nozzle in one end position of the movable member, and is provided with a seat for the thread which extends across in front of the point of the needle.
  • nozzle is hopper-shaped, and a collar-like head which is provided on the point of the needle and which fits centrally in the hopper-shaped nozzle so as to leave a clearance, between the head and the interior of the nozzle, forming an annular slot to admit secondary air.
  • said nozzle having an annular slot for discharging fluid, and having a central passage in which the point of the needle is positioned in one end position of the movable member.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US652978A 1966-07-14 1967-07-12 Device for launching a thread by jet action of a fluid to be used in conjunction with a loom Expired - Lifetime US3451437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31764/66A GB1150077A (en) 1966-07-14 1966-07-14 A device for inserting a weft thread by a jet fluid

Publications (1)

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US3451437A true US3451437A (en) 1969-06-24

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US652978A Expired - Lifetime US3451437A (en) 1966-07-14 1967-07-12 Device for launching a thread by jet action of a fluid to be used in conjunction with a loom

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Country Link
US (1) US3451437A (fr)
BE (1) BE701116A (fr)
CH (1) CH454058A (fr)
FR (1) FR1531853A (fr)
GB (1) GB1150077A (fr)
NL (1) NL6709289A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2086054A1 (fr) * 1970-04-14 1971-12-31 Te Strake Maschf
EP0344848A1 (fr) * 1988-06-02 1989-12-06 Picanol N.V. Procédé d'enfilage de tuyères avec une longueur de fil de trame exacte et métier à tisser utilisant ce procédé
US5111852A (en) * 1989-09-19 1992-05-12 Picanol N.V. Weft inserting nozzle with separate threading duct
US20080135125A1 (en) * 2006-12-12 2008-06-12 Sultex Ag Method and apparatus for the insertion of weft threads
CN109750410A (zh) * 2019-03-08 2019-05-14 浙江宁巍机械科技有限公司 一种喷水织机引纬系统及其调试方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5496168A (en) * 1978-01-06 1979-07-30 Nissan Motor Weft yarn introducing apparatus air jet type loom
BE904260A (nl) * 1986-02-21 1986-08-21 Picanol Nv Inrichting voor de insertie van inslagdraden in de gaap bij luchtweefmachines en regelbare blazers hierbij toegepast.
BE1000553A4 (nl) * 1987-05-12 1989-01-31 Picanol Nv Werkwijze voor het bedraden van een inslaginrichting bij weefmachines, en inslaginrichting die deze werkwijze toepast.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367371A (en) * 1965-02-23 1968-02-06 Strake Maschf Nv Device for introducing a weft thread into a shed

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367371A (en) * 1965-02-23 1968-02-06 Strake Maschf Nv Device for introducing a weft thread into a shed

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2086054A1 (fr) * 1970-04-14 1971-12-31 Te Strake Maschf
EP0344848A1 (fr) * 1988-06-02 1989-12-06 Picanol N.V. Procédé d'enfilage de tuyères avec une longueur de fil de trame exacte et métier à tisser utilisant ce procédé
US5111852A (en) * 1989-09-19 1992-05-12 Picanol N.V. Weft inserting nozzle with separate threading duct
US20080135125A1 (en) * 2006-12-12 2008-06-12 Sultex Ag Method and apparatus for the insertion of weft threads
US7748414B2 (en) * 2006-12-12 2010-07-06 Itema (Switzerland) Ltd Method and apparatus for the insertion of weft threads
CN109750410A (zh) * 2019-03-08 2019-05-14 浙江宁巍机械科技有限公司 一种喷水织机引纬系统及其调试方法
CN109750410B (zh) * 2019-03-08 2023-10-10 浙江宁巍机械科技有限公司 一种喷水织机引纬系统及其调试方法

Also Published As

Publication number Publication date
CH454058A (de) 1968-03-31
FR1531853A (fr) 1968-07-05
NL6709289A (fr) 1968-01-15
BE701116A (fr) 1967-12-18
GB1150077A (en) 1969-04-30

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