EP0321017B1 - Process and device for coupling and re-joining the thread with the roving in a ring-spinning frame - Google Patents

Process and device for coupling and re-joining the thread with the roving in a ring-spinning frame Download PDF

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Publication number
EP0321017B1
EP0321017B1 EP88202729A EP88202729A EP0321017B1 EP 0321017 B1 EP0321017 B1 EP 0321017B1 EP 88202729 A EP88202729 A EP 88202729A EP 88202729 A EP88202729 A EP 88202729A EP 0321017 B1 EP0321017 B1 EP 0321017B1
Authority
EP
European Patent Office
Prior art keywords
thread
ejector nozzle
nozzle
spinning
bundle
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.)
Expired - Lifetime
Application number
EP88202729A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0321017A1 (en
Inventor
Sandro Sartoni
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 EP0321017A1 publication Critical patent/EP0321017A1/en
Application granted granted Critical
Publication of EP0321017B1 publication Critical patent/EP0321017B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the present invention relates to a process and a device for coupling and re-joining the thread with the roving following thread breakage in a ring spinning frame.
  • the invention is to be used in combination with devices and means known from the prior art, in order to detect the presence of a broken thread, stop the spinning bobbin on which the breakage occurred, carry out the research of the free broken end of the thread on the same spinning bobbin, and catch said free end by means of suitable means.
  • Said roving can be of any compositions or structures, and in the present disclosure and in the appended claims, it will be simply referred to as the "roving” or “textile fibre bundle”, with both said terms being used in an interchangeable way.
  • Said devices have worked to date with satisfactory results, but they resulted to be susceptible of improvement as regards some of their operating units. It also resulted suitable to simplify them from the viewpoint of their executive methodology by resorting to new operating principles, destined to give greater guarantees of reliability and versatility in the application of the device, as a function or the large variety of types of textile materials and of their different manufacturing speeds.
  • the above mentioned error in positioning can also be of longitudinal type, i.e., the joining member can regularly come into contact with the drawing roll, but it may happen that the roving and the thread are not aligned to each other, but are offset relatively to each other. This may happen both owing to an error in positioning of the joining device relatively to the drawing roll, and owing to a right and necessary position of the roving caused by the weft shifter action.
  • the weft shifter action is a reciprocating shifting rightwards and leftwards of the trajectory, of the fibre bundle, in order not to generate a localized wear on the belts and on the rolls of the drawing unit.
  • the present invention overcomes the above drawbacks and eliminates any possibilities of missed junction between the thread and the fibre bundle exiting the drawing rolls of a spinning frame, and further provides a device which is structurally simple, from which considerably reliable operating steps arise.
  • Figure 2 shows a schematic, axonometric perspective view of the device which carries out the coupling and rejoining of the thread with the roving, at the time point at which the free end of the cut thread, and the textile fibre bundle have got coupled with each other, and are being twisted with each other, resuming the spinning process by the relevant spindle.
  • a prismatic block 1 Inside a prismatic block 1 an ejector nozzle 2 is provided. On its upper surface, the block 1 is provided with a "V"-shaped, or similarly shaped, groove in order to put and constrain, the taut thread 7 in a diametrical position and frontal adhesion relatively to the inlet port 3 of the ejector nozzle 2.
  • a pipe 4 provides for the primary pressurized fluid, with this latter being injected into a prolonging pipe 11 of the nozzle 2 according to the direction as shown by the arrow 4a. Said pressurized fluid generates the sucking "air race" 2a in the nozzle 2.
  • 5a and 5b are the two positions, the one moved backwards, and the other moved forwards, relatively to the drawing rolls 24 and 26, of a mobile saddle unit 5 supporting the block 1 and the nozzle 2.
  • the position 5a shown in dashed lines, corresponds to the retracted inoperative position of the mobile saddle unit 5 during the non-splicing-operating step;
  • the position 5b depicted in solid line, corresponds to the projecting operative position in which the mobile saddle unit 5 is during the splicing operating step.
  • Said positions are obtained by means of known motor means not depicted in that they do not constitute an object of the present invention.
  • 6a is the arrow showing the feed direction of the roving 6.
  • the thread 7 is generated when the textile fibre bundle 6 exiting the drawing rolls 24 and 26 is twisted, and is wound around the underlying spinning bobbin 14 by means of a technology and means which are per se known.
  • Scissor elements 9 are arranged on the saddle unit 5 for removing the excess thread immediately before the free end of the same thread gets coupled to the roving.
  • the fixed sucking nozzle 10 is positioned under the pair of drawing rolls 26 and 24, in order to be capable of intaking and removing a textile fibre bundle portion 8 after the breakage of the thread 7, until the re-joining has taken place.
  • a suction pipe 12 is connected to the nozzle 10 and to means destined to generate inside it, and, consequently, inside the nozzle 10, a depressure which is entrusted with the task of collecting from the working area, after the breakage of the thread, the fibres which continue to come out from the rolls 24 and 26, in order to prevent useless and dangerous deposits of wastes from forming along the spinning spindles.
  • the thread is wound on the tube 16 for forming the spinning bobbin 14 with end cone 15.
  • a spinning ring 21 rotating according to arrow 30 causes a true twist to be given to the thread 7 being formed.
  • the spinning spindle ring provided on the ring rail 22 which is provided with a reciprocating vertical movement, so as to reel the thread 7 according to concentric, mutually overlapping thread layers around the tube 16.
  • the drawing rolls 24 and 26 are positioned at the end side of the per se traditional drawing system. 28 is the arrow which shows the direction of revolution of the spinning spindle, and consequently of the spinning bobbin 14 which is engaged on it.
  • Two plates 18 and 19 frontally opposite to each other, are provided on the saddle unit 5 and urged against each other by elastic elements, or similar elements, so operating substantially in parallel in order to nip the free end of the thread 7.
  • the tension to the thread 7 is supplied owing to the effect of the nipping pressure between said two plates, between which the end portion of the same thread 7 is wedged in, after being picked up from the stationary spinning bobbin 14 after the thread brakage.
  • the travelling device detects, by using detecting means known from the prior art, whether the thread is present or not, on each spinning spindle. When it detects the absence of one of the threads under way of formation, the device stops the saddle unit 5 in front of the splindle wherein the broken thread is, and actuates the re-joining starting mechanisms.
  • the textile fibre bundle 6, when exiting the drawing rolls 26 and 24, is shifted and intaken by the sucking nozzle 10 and is held therein until the re-joining begins.
  • the free end of the broken thread is looked for on the upper layers wound on the spinning bobbin 14, and a long enough length of it is unwound.
  • the mobile saddle unit 5 Before the end of the thread 7 is wedged between said plates 18 and 19, the mobile saddle unit 5 is moved towards the area under the drawing rolls 24 and 26 and is stopped in the operative position 5b, as shown in the hereto attached drawings.
  • the inlet port 3 of the ejector nozzle 2 In said position the inlet port 3 of the ejector nozzle 2 is arranged in front of the inlet port of the sucking nozzle 10, whereas the thread 7 is positioned in a frontal and diametrical position relative to the inlet port 3 of the nozzle 2.
  • the true splicing of the present invention is carried out simply, with the aid of a sucking "air race” 2a, which performs the function of re-joining the textile fibre bundle 6 with the end of the thread 7, amalgamating them with each other, for resuming the spinning process.
  • the arm of the mobile pincers advantageously cooperates.
  • Said arm at the end of its movement, which enables the pincers to wedge the end of the thread 7 between the plates 18 and 19, actuates a microswitch, or a similar element, which enables the releasing of the brake which is keeping stopped the spindle of the spinning bobbin 14.
  • This latter starts to revolve, while the scissors 9 are simultaneously, or substantially simultaneously, actuated, and at the same time the ejector nozzle 2 is activated by delivering compressed air into the pipe 4, according to the direction 4a.
  • This latter actuation is such that a suction higher than that in the nozzle 10 is created in the nozzle 2, so as to immediately cause the textile fibre bundle 6 to be intaken and conveyed from the sucking nozzle 10 towards the inlet port 3 and into the interior of the ejector nozzle 2.
  • the scissors 9 In order to prevent the splice from resulting too long, the scissors 9 must be arranged between the plates 18,19 and the inlet port 3 of the ejector nozzle 2 in such a position to cut the thread at a point rather close to the inlet port 3.
  • the scissors 9 are advantageously actuated with a slight delay after the resumption of the revolutions of the ring 21, in order to give the twists the necessary time for them to rise up to the end of the thread nipped between the plates 18 and 19.
  • the above mentioned operating steps can at least partially overlap each other over time.
  • the use can be envisaged of a tearing device, of a traditional structure, in order to carry out a gradual breakage of the fibres, in order to improve the appearance of the splice. It should be stressed that the roving 6 does not need to be cut, or torn, in that at the time at which it is intaken into the interior of the ejector nozzle 2, its length is never eccessive.
  • the roving inside the suction duct 12 does maintain its fibrous structure along an initial length only, which is approximately equal to the length of the fibres. After this length, inasmuch as it does not have any consistency, the roving gets dissolved owing to the effect of the suction. Therefore, for the purposes of the splice, no need exists for the excess of roving length to be removed.
  • the ejector nozzle 2 is disabled, or partially disabled, with the action of the sucking "air race" 2a being discontinued, or limited.
  • the suction by the "air race” 2a does not retain the coupled thread or roving after that the joining is carried out, in order to prevent the thread 7 from remaining stuck, in correspondence of its upper section, to the inlet port 3 of the ejector nozzle 2, being thus hindered in its running towards the spindle, on which it has started to wind on the spinning bobbin 14.
  • the continuity of the roving/thread is reliably resumed, thus the continuity of the spinning process being resumed as well.
  • the main advantage of the herein proposed device is that the free end of the thread 7 meets always the fibres of the roving 6, whichever the position of these latter may be when exiting the drawing rolls 24 and 26. Therefore, the possibilities are nullified, that the thread 7 and the fibres of the roving 6 may not meet each other inside the interior of the sucking "air race” 2a of the ejector nozzle 2, in that both of them are attracted and piloted by suction.
  • the sucking "air race” inside the tube 11 instead of being generated by compressed air delivered through the tube 4, could be obtained by connecting said pipe 11 with a vacuum pump, or with a similar device.
  • the "air race" inside the pipe 11 can be possibly obtained by combining the suction with the blowing of compressed air by means of one or more nozzles. Also the air intake points may be more then one.
  • the mobile saddle unit 5 is returned to its initial position 5a, thus allowing the spinning to be regularly continued, and the reciprocating patrolling by the travelling unit, which is the supporting and moving unit for the saddle unit 5 of the present invention, to be resumed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP88202729A 1987-12-18 1988-11-30 Process and device for coupling and re-joining the thread with the roving in a ring-spinning frame Expired - Lifetime EP0321017B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23087/87A IT1223531B (it) 1987-12-18 1987-12-18 Procedimento e dispositivo per l'accoppiamento e il riattacco del filo allo stoppino in un filatoio ad anelli
IT2308787 1987-12-18

Publications (2)

Publication Number Publication Date
EP0321017A1 EP0321017A1 (en) 1989-06-21
EP0321017B1 true EP0321017B1 (en) 1993-01-13

Family

ID=11203640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202729A Expired - Lifetime EP0321017B1 (en) 1987-12-18 1988-11-30 Process and device for coupling and re-joining the thread with the roving in a ring-spinning frame

Country Status (5)

Country Link
EP (1) EP0321017B1 (enrdf_load_stackoverflow)
DE (1) DE3877541T2 (enrdf_load_stackoverflow)
ES (1) ES2039601T3 (enrdf_load_stackoverflow)
GR (1) GR3007182T3 (enrdf_load_stackoverflow)
IT (1) IT1223531B (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3913121A1 (en) * 2020-05-22 2021-11-24 Lakshmi Machine Works Ltd. An automatic yarn piecing apparatus and a method thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077312A (en) * 1959-06-12 1963-02-12 Reiners Walter Yarn-coil winding machine
DE2939644C2 (de) * 1979-09-29 1982-10-14 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Verfahren und Vorrichtung zur Beseitigung einer Unregelmäßigkeit am laufenden Faden an einer Offenend-Spinnstelle während des Spinnens
DE3034909C2 (de) * 1980-04-16 1985-01-24 Ivanovskij tekstil'nyj institut imeni M.V. Frunze, Ivanovo Vorrichtung zum maschinellen Rückführen und Andrehen eines gebrochenen Garns auf Spinnmaschinen
DE3143263A1 (de) * 1981-10-31 1983-05-11 W. Schlafhorst & Co, 4050 Mönchengladbach Vorrichtung zum partiellen strecken und parallelisieren der fasern eines fadens oder fadenendes
DE3405304A1 (de) * 1984-02-15 1985-08-29 W. Schlafhorst & Co, 4050 Mönchengladbach Druckluft-fadenspleissvorrichtung

Also Published As

Publication number Publication date
DE3877541T2 (de) 1993-07-22
DE3877541D1 (de) 1993-02-25
IT8723087A0 (it) 1987-12-18
IT1223531B (it) 1990-09-19
GR3007182T3 (enrdf_load_stackoverflow) 1993-07-30
ES2039601T3 (es) 1993-10-01
EP0321017A1 (en) 1989-06-21

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