WO1998046511A1 - Dispositif regulant l'accumulation et la fourniture de fil pour des machines textiles - Google Patents

Dispositif regulant l'accumulation et la fourniture de fil pour des machines textiles Download PDF

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Publication number
WO1998046511A1
WO1998046511A1 PCT/IT1997/000086 IT9700086W WO9846511A1 WO 1998046511 A1 WO1998046511 A1 WO 1998046511A1 IT 9700086 W IT9700086 W IT 9700086W WO 9846511 A1 WO9846511 A1 WO 9846511A1
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WO
WIPO (PCT)
Prior art keywords
yarn
rotating element
arms
grooves
cylindrical body
Prior art date
Application number
PCT/IT1997/000086
Other languages
English (en)
Inventor
Giuseppe Vischiani
Original Assignee
Giuseppe Vischiani
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giuseppe Vischiani filed Critical Giuseppe Vischiani
Priority to PCT/IT1997/000086 priority Critical patent/WO1998046511A1/fr
Publication of WO1998046511A1 publication Critical patent/WO1998046511A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum

Definitions

  • the present invention relates to a device for controlling the accumulation and supply of yarn feeding textile looms, e.g. the supplier of weft yarn in shuttleless looms.
  • weft supply regulators One of the principal requirements of weft supply regulators is guaranteeing rapid and regular feed of the weft yarn to the loom. This is generally achieved by having a number of buffer coils of yarn wound onto a cylindrical drum; this buffer yarn allows the tension of the yarn running out of the device to be maintained substantially constant independently of wide variations in tension found in the yarn entering the device. These differences in tension of the yarn being collected from the feeding spool are caused by the large difference between the diameter of the spool when full of yarn (around 20-25 cm.) and the diameter of the empty spool (around 4-6 cm.).
  • the drum is provided with external surface grooves that maintain the coils separate during the continuous winding and unwinding of the buffer yarn onto and off the drum.
  • one or more photosensors are provided that detect the presence of the yarn in one or more pre-set axial positions along the drum. These sensors enable an electric motor that sets the drum in rotation to collect yarn from the feeder spool in a such way as to maintain a substantially constant buffer supply on the same drum as the yarn is gradually supplied to the loom.
  • the photosensors are generally placed in proximity to the end where the yarn is taken off the device, and are directed toward the surface of the drum where they require a smooth reflecting surface in order to be able to detect the absence of yarn. In this situation, incidental light is reflected toward the photosensor; when there is yarn on the smooth surface, the incidental light is not reflected toward the photosensor.
  • the external surface of the drum is preferably completely grooved, thus depriving it of a smooth reflecting portion that would enable normal operation of the photosensors.
  • the aim of the present invention is to overcome the limits of the known technique by reconciling conciliating demands, i.e. by preventing the coils of yarn near the extremity of the drum overlapping and by allowing the correct detection of the presence of yarn on the same.
  • An object of the present invention is to produce a device for the accumulation and the supply of yarn that provides the reliable detection of the presence of yarn on the drum at pre-set axial positions of the same.
  • a further object of the present invention is to produce ⁇ device for the accumulation and the supply of yarn that ensures accurate positioning of the coils of yarn on the drum up to the yarn take-off area of the same.
  • a device for controlling the accumulation and supply of yarn to a textile machine comprising a motor for rotating a rotating element having a plurality of arms which extend axially to receive a quantity of yarn wound in coils before the same is sent to the textile machine; means for detecting the presence of yarn in at least one pre-set axial position of the rotating element and for engaging or disengaging the rotary action of the rotating element; and a substantially cylindrical body, grooved on its outer surface, fitted inside the said rotating element in a fixed manner with respect to the same, in a position coaxial to its axis of rotation in such a way that the coils of yarn supported by the arms of the rotating element engage the grooves exposed between the arms, characterised by the means of detecting the presence of yarn being fixed internally of the said grooved cylindrical body.
  • the means for detecting the presence of yarn is activated by pressure of the yarn stretched between the arms of the rotating element.
  • the means for detecting the presence of yarn comprise at least one pair of sensors, operated by means of respective spigots arranged in radial direction.
  • the spigots can run from a position in which the respective external extremity is substantially aligned with the crests of the grooves of the cylindrical body under the action of respective elastic elements and a position in which the respective external extremity is substantially aligned with the troughs of the grooves of the cylindrical body under the action of pressure from the yarn present on the rotating element and engaged in the grooves.
  • the said spigots lie in the same plane perpendicular to the axis of rotation of the rotating element.
  • the angular distance between the spigots activating the sensors is different from the angular distance between any two arms of the rotating element.
  • the employment of two sensors arranged in this way gives, in the presence of yarn, a continuous electric signal.
  • the two sensors implement a logical "OR" function that indicates the presence of yarn when at least one of the two spigots is pressed, but indicates its absence when neither is pressed.
  • Photoelectric sensors e.g. those operated by infrared rays, are used in the preferential embodiment. Each sensor is in practice activated by the respective spigot that intervenes between the cell sending the radiation and the cell receiving the radiation.
  • the photoelectric sensors are preferred since they guarantee high reliability over time compared to other suitable devices, such as switches or the same.
  • the cylindrical fixed body is provided with grooves on the whole side surface.
  • the coils of yarn that draw near to the yarn take-off zone are thus always engaged in the grooves of the cylindrical fixed body, and are simultaneously facilitated in the release of yarn in proximity of the yarn take-off position for take-up by the rotating element.
  • FIG. 1 is a view in longitudinal section of a detail of the device according to the invention, in which the means of detecting the presence of yarn are shown in non-activated condition and
  • figure 2 is a view in transverse section of the detail of figure 1 , in which the means of detecting the presence of yarn are shown in activated condition.
  • the device according to the invention comprises a rotating element 1 which is rotated by the shaft 2.
  • the rotating element 1 is provided with arms 3 extending in an axial direction (for instance six arms as in figure 2) on which the yarn 4 deriving from a feeder spool (not shown) is coiled .
  • On the rotating element 1 is provided preferably a conical section 5 that facilitates the initial positioning of the yarn 4 on the rotating element 1.
  • there is provision of permanent magnets 8, fitted circumferentially on the rotating element 1 to drag an external movable member (not shown) into rotation synchronised with the rotating element 1 .
  • the grooves 7 cover the entire outside surface of the cylindrical body 6 and there is a terminal portion 7' in which the crests-height slightly decreases toward the yarn take-off extremity of the device.
  • the grooves 7 have a regular depth of around 2 mm for around 4/5 of the axial length of the whole cylindrical body 6.
  • the crests of the portion of grooves 7' are conical in shape with height slightly decreasing ( to around 0.1 mm) toward the yarn 4 take-off extremity.
  • the coils of the buffer quantity of yarn 4, supported on the arms 3 of the rotating element 1 engage the grooves exposed between the arms 3 up to the yarn take-off zone. In this way it is possible to get correct spacing between the coils of yarn of the buffer quantity even in proximity of the yarn take-off zone, i.e. in the zone in which overlapping between the coils of yarn is verified more frequently in the devices of known type which are only partially grooved.
  • the arms 3 have rounded transverse section to give optimum engagement of the yarn 4 in the troughs of the underlying grooves 7.
  • the means for detecting the presence of yarn on the rotating element 1 are arranged in proximity of the yarn take-off zone and are operated by means of pressure of the yarn stretched between the arms 3 of the rotating element 1.
  • the means for detecting the presence of yarn on the rotating element 1 comprise a pair of sensors 10 which are activated by respective spigots 1 1 positioned radially with respect to the cylindrical body 6 and to the rotating element 1.
  • the spigots 1 1 both equipped with heads 12 located at the level of the grooves 7, run between a position in which the respective external extremity of the heads 12 is substantially aligned with the crests of the grooves 7 (as shown in figure 1 ) under the action of respective elastic elements 13, and a position in which the respective external extremity of the heads 12 is substantially aligned 7' with the troughs of the grooves (as shown in figure 2) under the action of pressure from the yarn present on the rotating element 1 and engaged in the grooves 7.'
  • the activating spigots 1 1 are lined up in the same plane perpendicular to the axis of rotation of element 1.
  • the angular distance between the activating spigots of the sensors is different from the angular distance between any two arms 3 of the rotating element 1.
  • the angular distance between two consecutive arms 3 is 60°
  • the angular distance between the spigots 1 1 is around 30°.
  • photoelectric-type sensors equipped with a source of radiation and of a sensitive cell to this radiation.
  • the spigots 1 1 intervening between the source of radiation and the detector cell, indicate to the system of control of the device the presence of yarn on the rotating element 1 at a pre-set position.
  • the presence of two sensors 10 and their particular position prevent the generation of pulsating signals during the passage of the arms across each sensor. In fact, when that happens, the yarn is lifted from the trough of the grooves 7' and at least one of the sensors remains inactive. After the arm has completed its passage across the first of the two sensors, the yarn returns to reactivate the first of the two sensors before the arm transits across the second of the two sensors. In this way the condition of presence of yarn is maintained when one or the other or both the sensors are activated, while the absence of yarn is indicated when both the sensors are inactive.
  • an electronic control unit is provided to which arrive the signals deriving from the sensors 10 suitably amplified with electronic device of known type.
  • the control unit of the device preferably acts on the electromechanical clutch system between the motor and the shaft, rather than directly on the power supply to the motor, on the basis of the signals received from the sensors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

Un dispositif régulant l'accumulation et la fourniture de fil pour une machine textile comprend un élément rotatif (1) équipé de plusieurs bras (3) disposés axialement de façon à recevoir une quantité de fil (4) en attente enroulé en bobines avant son envoi à la machine textile, et un corps (6) sensiblement cylindrique, rainuré (7) sur sa surface externe, placé dans une position fixe coaxialement à l'axe de rotation de l'élément rotatif (1). D'autres dispositifs (10-13) sont fixés à l'intérieur du corps cylindrique rainuré de façon à détecter la présence de fil dans au moins une position axiale prédéterminée de l'élément rotatif.
PCT/IT1997/000086 1997-04-17 1997-04-17 Dispositif regulant l'accumulation et la fourniture de fil pour des machines textiles WO1998046511A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT1997/000086 WO1998046511A1 (fr) 1997-04-17 1997-04-17 Dispositif regulant l'accumulation et la fourniture de fil pour des machines textiles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT1997/000086 WO1998046511A1 (fr) 1997-04-17 1997-04-17 Dispositif regulant l'accumulation et la fourniture de fil pour des machines textiles

Publications (1)

Publication Number Publication Date
WO1998046511A1 true WO1998046511A1 (fr) 1998-10-22

Family

ID=11332717

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1997/000086 WO1998046511A1 (fr) 1997-04-17 1997-04-17 Dispositif regulant l'accumulation et la fourniture de fil pour des machines textiles

Country Status (1)

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WO (1) WO1998046511A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4676442A (en) * 1984-08-16 1987-06-30 Aktiebolaget Iro Yarn accumulation and feeding apparatus
US4708299A (en) * 1985-08-10 1987-11-24 Sobrevin Societe De Brevets Industriels-Etablissement Thread delivery device
WO1992019524A1 (fr) * 1991-05-03 1992-11-12 Candia Ets. Dispositif d'amenee de fil de trame pour metiers a tisser sans navette
US5211347A (en) * 1990-06-29 1993-05-18 Sobrevin Societe De Brevets Industriels-Etablissement Thread feed device
EP0624674A1 (fr) * 1993-05-10 1994-11-17 L.G.L. ELECTRONICS S.p.A. Dispositif de détection optique de fil de trame et fournisseur de trame pourvu d'un tel dispositif

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4676442A (en) * 1984-08-16 1987-06-30 Aktiebolaget Iro Yarn accumulation and feeding apparatus
US4708299A (en) * 1985-08-10 1987-11-24 Sobrevin Societe De Brevets Industriels-Etablissement Thread delivery device
US5211347A (en) * 1990-06-29 1993-05-18 Sobrevin Societe De Brevets Industriels-Etablissement Thread feed device
WO1992019524A1 (fr) * 1991-05-03 1992-11-12 Candia Ets. Dispositif d'amenee de fil de trame pour metiers a tisser sans navette
EP0624674A1 (fr) * 1993-05-10 1994-11-17 L.G.L. ELECTRONICS S.p.A. Dispositif de détection optique de fil de trame et fournisseur de trame pourvu d'un tel dispositif

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