EP0375014A2 - Procédé et dispositif pour réunir et rattacher un fil à une mèche dans un continu à filer à anneaux - Google Patents

Procédé et dispositif pour réunir et rattacher un fil à une mèche dans un continu à filer à anneaux Download PDF

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Publication number
EP0375014A2
EP0375014A2 EP89203103A EP89203103A EP0375014A2 EP 0375014 A2 EP0375014 A2 EP 0375014A2 EP 89203103 A EP89203103 A EP 89203103A EP 89203103 A EP89203103 A EP 89203103A EP 0375014 A2 EP0375014 A2 EP 0375014A2
Authority
EP
European Patent Office
Prior art keywords
yarn
sliver
yarn end
drafting
textile fibre
Prior art date
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.)
Withdrawn
Application number
EP89203103A
Other languages
German (de)
English (en)
Other versions
EP0375014A3 (fr
Inventor
Sandro Sartoni
Giovanni Verlicchi
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.)
Savio SpA
Savio Macchine Tessili SpA
Original Assignee
Savio SpA
Savio Macchine Tessili SpA
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 Savio SpA, Savio Macchine Tessili SpA filed Critical Savio SpA
Publication of EP0375014A2 publication Critical patent/EP0375014A2/fr
Publication of EP0375014A3 publication Critical patent/EP0375014A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing
    • D01H15/013—Carriages travelling along the machines

Definitions

  • This invention relates to a device for engaging the yarn with and joining it to the sliver in a ring spinning machine, the device to be used in combination with known means for sensing the presence of a broken yarn, for halting the package on which the breakage has occurred, for seeking the broken yarn end on the package and for seizing said end by suitable means, as described in other patents of the present applicant.
  • Said sliver can be of any composition or structure, and in the ensuing description and claims will be simply called sliver or textile fibre sliver, the terms being synonymous.
  • Said equipment has operated satisfactorily, although certain of its operating units could well be improved. It would also be advantageous to simplify its overall working method by incorporating new operating principles designed to give improved reliability and versatility in applying the equipment to the great variety of types of textile materials and their different manufacturing speeds.
  • the automatic yarn rejoining equipment is improved by it now embracing a new method and a new device for engaging the broken yarn end with and rejoining it to the sliver.
  • the known methods and devices for joining the yarn to the sliver implement said operation mechanically, by engaging the yarn and sliver at the exit of the last pair of drafting rollers.
  • Said methods are of poor reliability in that they sometimes result in an unsuccessful joint. This is because a transverse positioning error can arise in the joining device, which therefore does not make contact with the drafting roller with the result that the textile fibre sliver and the yarn do not join due to lack of contact.
  • Said positioning error can also be of longitudinal type, ie the joining member can properly touch the drafting roller but the sliver and yarn may not face each other but instead be mutually offset. This can happen either because of an error in the positioning of the joining device relative to the drafting roller, or because of the necessarily displaced position of the sliver following the sliver shift action.
  • the sliver shift action is an alternating rightwards and leftwards movement of the fibre sliver trajectory in order not to generate localized wear of the belts and rollers of the drafting unit.
  • the method has resulted in a substantial improvement in reliability and quality in the rejoining of the yarn to the sliver. Nevertheless, sometimes, and only if working with very thin yarns, the method produces a joint which is not always reliable and of optimum quality in that the sliver leaving the drafting unit is composed of a small number of fibres which within the air stream inside the suction tube have to be engaged with and twisted together with the yarn, the twists of which, rising up from the spindle, have to be able to restrain and retain said few fibres, which instead tend to be dragged away by the action of the suction air stream. It is apparent that when very thin yarns are concerned, it is necessary to control the suction effect very precisely, this not being easy.
  • the method and the device for implementing the present invention solve the aforesaid problems by a solution which makes it impossible for the yarn and fibre sliver leaving the drafting unit not to encounter each other, and with which no difficulty arises if very thin yarns are concerned.
  • a further advantage of the device over the known art is its extreme constructional simplicity, which results in very reliable operation.
  • the method of the present invention which enables the yarn end, picked up from the package under formation, to be led between a scissor element and between a gripper element, the one overlying the other, said elements being fixed to the terminal part of a mobile arm which is guided in its movement by a cam track supported by a mobile slide unit pertaining to a carriage-mounted unit; and which also enables the gripper element to be activated to retain the yarn and, immediately afterwards, the scissor element to be activated to cut the yarn; and which further enables the yarn end retained by the gripper element to be moved to rest against the side of the presser roller in a zone proximate to the line of contact between the two last rollers of the drafting unit; and which further enables the yarn end to be retained for a very short time against said side to enable the presser roller to drag said yarn end round below the line of contact, so making it possible for the yarn to engage the textile fibre sliver; and which further enables the yarn end to be released by
  • the device used for the practical implementation of the method of the present invention comprises a mobile slide unit associated integrally with a carriage-mounted unit provided with a mobile arm, the end part of which comprises a scissor element overlying a gripper element, which mobile arm, after gripping and cutting the yarn end picked up from the package under formation, guides the yarn by means of a cam track into contact with the side of the presser roller of the last pair of drafting rollers.
  • 2 is the presser roller lying on the drafting roller 3.
  • Said presser and drafting rollers represent the last pair of the drafting unit 12;
  • 10 is the textile fibre sliver which passes through the drafting unit 12 to emerge from the pair of rollers 2 and 3 and be conveyed, in the case of a yarn breakage, into the suction tube 8;
  • 9 are the gripper and scissor elements, one above the other, said elements being fixed to the terminal part of a mobile arm 1;
  • 7 is a pneumatic or electromagnetic actuator or any actuator of the known art for simultaneously operating the gripper and scissor elements 9;
  • 6 represents the line of contact between the presser roller 2 and the underlying drafting roller 3;
  • 29 is an arrow indicating the direction of rotation of the drafting roller 3, which in relation to the presser roller direction of rotation indicated by the arrow 4 is such as to cause the textile fibre sliver 10 to emerge from the drafting unit 12;
  • 16 is an actuator of cable type, ie without a rod, which
  • Said actuator is operated pneumatically or by any other drive source;
  • 18 is the support for the mobile slide 15;
  • 14 is the actuator which moves the mobile slide 15 by means of the rod 30;
  • 11 is the plate for connecting the actuator 14 to the support 18;
  • 5 is the suitably contoured cam track for guiding the mobile arm 1 into a position such that the end of the yarn 20 rests against the side of the presser roller 2;
  • 22 is the cap which by suction retains the yarn end picked up from the package 23 under formation;
  • 25 is a schematic line representation of the carriage-mounted unit which travels along the spinning machine face, said unit advantageously housing the entire device of the present invention;
  • 20 is the yarn end picked up by known means from the package 23 under formation;
  • 27 is the traveller which during the spinning process rotates along the ring 26, which is supported by and fixed on the bench 24;
  • 21 is the antiballoon yarn guide or balloon control ring;
  • 19 is the yarn guide lying below the drafting unit;
  • 28 is the support tube for
  • the carriage ascertains by sensor means of the known art whether the yarn is present or absent in each spinning spindle. When it senses the absence of one of the yarns, it halts the carriage at the spindle where the broken yarn is located and starts the mechanisms for initiating the rejoining operation. At the moment of breakage of the yarn 20, the textile fibre sliver 10 from the drafting rollers 2 and 3 is sucked into the suction tube 8 and retained until rejoining has taken place. The broken yarn end is then sought within the upper layers of the package 23 and a sufficient length of it is automatically unwound, as described in other patents of the present applicant.
  • Said end is withdrawn and raised along a predetermined path, and retained by the suction cap 22.
  • the spindle on which the package 23 under formation is mounted does not rotate, and is kept at rest by suitable means.
  • the yarn end 20 is therefore retained by the suction cap 22, along its path it having been inserted into the various elements present between the package and said cap using conventional means and operating methods well known to the expert of the art.
  • the yarn end is also positioned frontally between the scissor and gripper elements 9 fixed to the terminal part of a mobile arm 1.
  • the actuator 7 is operated to operate the gripper and scissor elements 9, one above the other, in order to lock and cut the yarn end 20.
  • the yarn portion which is cut away between the mobile arm 1 and the suction cap 22 is sucked in by this latter and thus removed.
  • the gripper element grips the yarn just before the scissor element cuts it.
  • the thus retained yarn end 20 is moved against the side of the presser roller 2 by the simultaneous or successive or partially superimposed operation of the actuators 14 and 16.
  • the mobile arm 1 is guided by the cam track 5 so as to position the yarn end 20 against the side of the presser roller 2.
  • This contact is made under a certain pressure and is effected in that side portion proximate to the contact line 6.
  • the yarn end 20 is immediately dragged round by the presser roller 2, which drags it into a trapped position below the contact line 6, so making it possible for the yarn to be brought into contact with the textile fibre sliver 10.
  • the gripper element 9 is opened after the yarn has been dragged below the the contact line 6.
  • the rejoining method of the present invention gives perfectly repeatable and reliable results throughout the entire range of yarns, including the thinnest yarns produced by manufacturers.
  • the mobile slide unit 15 and the arm 1 are returned to their initial position, to thus enable spinning to proceed in a regular manner and the carriage-mounted unit 25 to again patrol backwards and forwards, this latter representing the support and handling unit for the device of the present invention.
  • the described embodiments are given by way of non-limiting example only. It is apparent that modifications can be made by experts of the art to the details of the device, but without leaving the general idea of the method of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP19890203103 1988-12-23 1989-12-07 Procédé et dispositif pour réunir et rattacher un fil à une mèche dans un continu à filer à anneaux Withdrawn EP0375014A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2309188 1988-12-23
IT8823091A IT1227728B (it) 1988-12-23 1988-12-23 Procedimento e dispositivo per unire e per riattaccare il filo allo stoppino in un filatoio ad anello

Publications (2)

Publication Number Publication Date
EP0375014A2 true EP0375014A2 (fr) 1990-06-27
EP0375014A3 EP0375014A3 (fr) 1991-01-02

Family

ID=11203685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890203103 Withdrawn EP0375014A3 (fr) 1988-12-23 1989-12-07 Procédé et dispositif pour réunir et rattacher un fil à une mèche dans un continu à filer à anneaux

Country Status (2)

Country Link
EP (1) EP0375014A3 (fr)
IT (1) IT1227728B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110093696A (zh) * 2018-01-31 2019-08-06 里特机械公司 用于移送纱线端部的设备、方法以及环锭纺纱机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3748054B1 (fr) * 2019-06-06 2023-02-22 Lakshmi Machine Works Ltd. Métier à filer à anneau comprenant un ensemble de rattachage automatique de fil et un appareil d'inclinaison de guide-fil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1461680A (fr) * 1965-05-08 1966-02-25 Machine automatique pour lier les fils rompus dans les machines à filer
US3540200A (en) * 1967-08-19 1970-11-17 Toyo Boseki Automatic yarn piecing apparatus for ring spinning frame or the like
US3619999A (en) * 1969-04-01 1971-11-16 Roberto Escursell Prat Yarn piecing apparatus
US3855769A (en) * 1973-09-19 1974-12-24 Leesona Corp Strand threading mechanism for ring textile machines
DE2361969A1 (de) * 1973-12-13 1975-06-26 Zinser Textilmaschinen Gmbh Fahrbare einrichtung zur selbsttaetigen behebung von fadenbruechen an textilmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110093696A (zh) * 2018-01-31 2019-08-06 里特机械公司 用于移送纱线端部的设备、方法以及环锭纺纱机

Also Published As

Publication number Publication date
EP0375014A3 (fr) 1991-01-02
IT1227728B (it) 1991-05-06
IT8823091A0 (it) 1988-12-23

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