EP0709502B1 - Verfahren und Vorrichtung zum Verbinden von Vorgarn in Spinnmaschinen - Google Patents

Verfahren und Vorrichtung zum Verbinden von Vorgarn in Spinnmaschinen Download PDF

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Publication number
EP0709502B1
EP0709502B1 EP95202742A EP95202742A EP0709502B1 EP 0709502 B1 EP0709502 B1 EP 0709502B1 EP 95202742 A EP95202742 A EP 95202742A EP 95202742 A EP95202742 A EP 95202742A EP 0709502 B1 EP0709502 B1 EP 0709502B1
Authority
EP
European Patent Office
Prior art keywords
roving
tubular guide
rovings
guide element
old
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
EP95202742A
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English (en)
French (fr)
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EP0709502A1 (de
Inventor
Giovanni Patriarca
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.)
SAMPRE Societa Meccanica Precisione SpA
Original Assignee
SAMPRE Societa Meccanica Precisione SpA
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Filing date
Publication date
Application filed by SAMPRE Societa Meccanica Precisione SpA filed Critical SAMPRE Societa Meccanica Precisione SpA
Publication of EP0709502A1 publication Critical patent/EP0709502A1/de
Application granted granted Critical
Publication of EP0709502B1 publication Critical patent/EP0709502B1/de
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
    • D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/005—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for removing empty packages or cans and replacing by completed (full) packages or cans at paying-out stations; also combined with piecing of the roving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H69/00—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device
    • B65H69/06—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by splicing
    • B65H69/061—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by splicing using pneumatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments
    • B65H2701/311—Slivers

Definitions

  • This invention relates to a roving joining method and device, applicable to spinning machines.
  • D1 DE-A-3114538
  • D2 DE-A-3612229
  • the device disclosed in D1 has a structure that must be opened to introduce the new and the old rovings and substantially comprises a first and a second part that must be displaced in order to put the new and the old roving in contact and to join them.
  • D2 provides a splicing chamber having their axes displaced from each other. The reliability and the cost of said devices are not such as to allow them to be advantageously used on a wide scale, mainly for the following reasons:
  • the roving joining operation is still preferably carried out by an operator by halting the spinning unit of the machine and manually inserting the two rovings, the old and the new, simultaneously into the drafting unit and checking that the aforesaid conditions are verified.
  • the joint obtained is substantially a connection between the rovings such that the operating roving is able to drag the new roving into operation, while simultaneously allowing the subsequent drafting of the rovings even if joined.
  • the connection made has the merit of still allowing relative sliding between the roving fibres even at the point of joining, and which must necessarily occur to be able to effect the subsequent drafting of the roving without defects at the joint.
  • the joint is only semi-effective because, even if the new roving is sufficiently wound on the old roving to be dragged into operation, to prevent further yarn defects the tail end of the old roving must also be joined.
  • tail end is formed as a result of the emptying of the bobbin on which said old roving is wound (a very rare case) or by breaking said roving is indifferent.
  • the operation of the second nozzle within the tubular guide element of open cross-section generates a second stream which also winds the tail end of the old roving as helical turns onto the new roving, which is substantially taut as it is in operation.
  • the device for joining the tail end of the old roving onto the new roving can also be used separately from the first device if it is required only to join the roving tail end, for example because the joint between the rovings has already been previously made manually or by a device. In either case the device for joining the tail end can operate either in collaboration with a gripper device or not.
  • the gripper device is synchronized with the operation of the two nozzles 4 and 5 such that the tail end of the old roving has a length suitable for winding by the second nozzle 5.
  • the tail end joining device is particularly versatile.
  • the first device for joining the initial end of the new roving and the second device for joining the tail end of the old roving can use one and the same tubular guide element.
  • the first and second nozzle are positioned at the two ends of said guide element respectively and must be operated selectively and sequentially to prevent the jet from one interfering negatively with that from the other.
  • the tubular guide element has an open cross-section mainly to allow the roving or rovings to be joined to be rapidly and easily inserted through the relative slit. Hence it is not to be excluded that a closed guide element without the said slit can equally operate satisfactorily.
  • the invention is described by way of non-limiting example in terms of an embodiment which has been improved such as to comprise a single guide serving both the the joining devices. In this respect it is assumed that such an embodiment is more suitable for current requirements.
  • Figure 1 shows the device mounted on a unit of the spinning machine.
  • Figure 2 is a perspective view of the device.
  • Figure 3 is a plan view of the device.
  • Figures 4A-4E are schematic illustrations showing the device during the various stages of operation.
  • the roving joining device 1 comprises a gripper device 2, a guide element 3, a first nozzle 4 and a second nozzle 5.
  • the device 1 is housed on each unit (or position) of the spinning machine between the creel 6 and the drafting unit 7, which are conventional. Consequently the spinning machine comprises a number of devices equal to the number of units.
  • the creel 6 is able to contain at least one depleting bobbin 8 and at least one full bobbin 9.
  • the gripper device 2 comprises a movable abutment 10 and a fixed abutment 16 separated by a gap 11 between which the roving to be broken can slide.
  • the guide element 3 is of tubular form with its axis 13 parallel to the axis of movement of the roving in operation.
  • the element 3 is of open cross-section because of the presence of a longitudinal slit 12 through which the roving or rovings can be inserted.
  • the cross-section of the element 3 is such that an air jet directed towards its interior is able to form a swirl essentially about and along the axis 13.
  • the guide 3 can have any of the following shapes: a portion of a circle, a portion of an ellipse, a portion of a circumferential involute, a portion of an Archimedes spiral, or similar and/or intermediate shapes.
  • the first nozzle 4 is connected to a compressed air generator (not shown) and is positioned at a first end of the tubular guide element 3 and orientated towards the interior of said guide element 3 so as to generate an air swirl extending along the entire extension of the element 3, and having a component in the direction of advancement of the roving in operation.
  • the second nozzle 5 is also connected to a compressed air generator, preferably that to which the first nozzle 4 is connected, and is positioned at a second end of the tubular guide element 3 and orientated towards the interior of said guide element 3 to generate an air swirl rotating about the axis 13 and extending along the entire extension of the element 3, but with a component directed in the opposite direction to the direction of advancement of the roving in operation.
  • This breakage of the old roving 14 determines the formation of the relative tail end 14A.
  • the device of the invention joins the rovings together by a method comprising the following steps:
  • the tail end of the old roving is also wound about the (new) roving in operation, which is taut along a rectilinear axis.
  • the winding is achieved by a further air swirl rotating about the rovings and having a component in the opposite direction to the direction of advancement of the rovings in operation so as to form further helical turns.
  • the tail end of the old roving can be formed either by programmed breakage of the roving or by natural depletion of the bobbin.
  • the first case is however preferred because it reduces to a minimum a region which is critical as it can easily become a source of imperfection in the yarn being produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (11)

  1. Vorrichtung (1) zum Verbinden von Vorgarn, welche insbesondere in Spinnmaschinen einsetzbar ist und eine erste Vorrichtung (3, 4) zum Verbinden des vorderen Endes des neuen, von einer vollen Spule (9) herrührenden Vorgarns mit dem alten, von einer zur Neige gehenden Spule (8) herrührenden Vorgarn und eine zweite Vorrichtung (3, 5) zum Verbinden des hinteren Endes des altes Vorgarns mit dem neuen, bereits in Betrieb befindlichen Vorgarn aufweist, wobei die erste Vorrichtung (3, 4) umfaßt:
    ein erstes, rohrförmiges Führungselement (3), dessen Achse (13) parallel zur Bewegungsachse des in Betrieb befindlichen Vorgarns angeordnet ist;
    eine Düse (4), welche Druckluft in das Innere des rohrförmigen Führungselementes (3) leitet und derart geneigt ist, daß der erzeugte Strahl (4) auch eine Komponente in derselben Richtung wie die Vorschubrichtung des in Betrieb befindlichen Vorgarns hat;
    wobei die zweite Vorrichtung umfaßt:
    ein zweites, rohrförmiges Führungselement (3), dessen Achse (13) parallel zur Bewegungsrichtung des in Betrieb befindlichen Vorgarns angeordnet ist;
    eine zweite Düse (5), welche Druckluft in das Innere des rohrförmigen Führungselementes (3) leitet und in die entgegengesetzte Richtung bezogen auf die Vorschubrichtung des neuen, in Betrieb befindlichen Vorgarns geneigt ist,
    dadurch gekennzeichnet, daß
    die ersten und zweiten, rohrförmigen Führungselemente (3)
    wegen des Vorhandenseins eines länglichen Schlitzes (12) einen ständig offenen Querschnitt haben,
    ständig dieselbe Achse (13) haben.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die ersten und zweiten, rohrförmigen Führungselemente (3) zu einem einzigen Element (3) miteinander verbunden sind.
  3. Vorrichtung nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß die Form des offenen Querschnitts des rohrförmigen Führungselementes (3) rund ist.
  4. Vorrichtung nach den Ansprüchen 1 und/oder 2, dadurch gekennzeichnet, daß die Form des offenen Querschnitts des rohrförmigen Führungselementes (3) elliptisch ist.
  5. Vorrichtung nach den Ansprüchen 1 und/oder 2, dadurch gekennzeichnet, daß die Form des offenen Querschnitts des rohrförmigen Führungselementes (3) eine Umfängsevolvente ist.
  6. Vorrichtung nach den Ansprüchen 1 und/oder 2, dadurch gekennzeichnet, daß die Form des offenen Querschnitts des rohrförmigen Führungselementes (3) eine Archimedesspirale ist.
  7. Vorrichtung nach den Anspruch 1, dadurch gekennzeichnet, daß zum Sperren des zur Neige gehenden Vorgarns eine Vorrichtung (2) vorgesehen ist, welche stromaufwärts von dem rohrförmigen Führungselement (3) positioniert ist.
  8. Verfahren zum gegenseitigen Verbinden wenigstens zweier Vorgarne in einer Spinnmaschine, umfassend:
    einen ersten Schritt, bei welchem das vordere Ende des neuen Vorgarns neben dem in Betrieb befindlichen, längs einer geradlinigen Achse gespannten Vorgarn positioniert wird;
    einen zweiten Schritt, bei welchem das vordere Ende des neuen Vorgams mittels eines um die Vorgarne rotierenden Luftwirbels um das in Betrieb befindliche Vorgarn gewickelt wird;
    einen dritten Schritt, bei welchem die miteinander verbundenen Vorgarne in die Streckvorrichtung eingelegt werden;
    einen vierten Schritt, bei welchem das hintere Ende des alten Vorgarns mittels eines anderen, um die Vorgarne rotierenden Luftwirbels um das neue, in Betrieb befindliche Vorgarn gewickelt und längs einer geradlinigen Achse gespannt wird,
    dadurch gekennzeichnet, daß
    der Luftwirbel des zweiten Schritts eine Komponente in Vorschubrichtung des in Betrieb befindlichen Vorgarns hat, um eine Anzahl von schraubenförmigen Windungen zu bilden, welche zum Erzeugen eines Reibungsgrades, wie etwa zum Sicherstellen eines Mitziehens, ausreicht, und daß der weitere Luftwirbel eine Komponente in der entgegengesetzten Richtung in bezug auf die Vorschubrichtung der in Betrieb befindlichen Vorgarne zwecks der Bildung weiterer schraubenförmiger Windungen aufweist.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß das hintere Ende des alten Vorgarns durch den programmäßigen Riß des Vorgarns gebildet wird.
  10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß das hintere Ende des alten Vorgams durch das natürliche Leerlaufen der Spule gebildet wird.
  11. Verfahren zum gegenseitigen Verbinden wenigstens zweier Vorgarne in einer Spinnmaschine, dadurch gekennzeichnet, daß das hintere Ende des alten Vorgarns mittels eines Luftwirbels, welcher sich um die Vorgarne dreht und eine Komponente in der entgegengesetzten Richtung in bezug auf die Vorschubrichtung der in Betrieb befindlichen Vorgarne zwecks Bildung weiterer schraubenförmiger Windungen aufweist, um das neue, in Betrieb befindliche Vorgarn gewunden und dadurch entlang einer geradlimigen Achse gespannt wird.
EP95202742A 1994-10-26 1995-10-11 Verfahren und Vorrichtung zum Verbinden von Vorgarn in Spinnmaschinen Expired - Lifetime EP0709502B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI942192A IT1271046B (it) 1994-10-26 1994-10-26 Metodo e dispositivo per la giunzione degli stoppini applicabile a macchine per la filatura
ITMI942192 1994-10-26

Publications (2)

Publication Number Publication Date
EP0709502A1 EP0709502A1 (de) 1996-05-01
EP0709502B1 true EP0709502B1 (de) 1998-07-08

Family

ID=11369776

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Application Number Title Priority Date Filing Date
EP95202742A Expired - Lifetime EP0709502B1 (de) 1994-10-26 1995-10-11 Verfahren und Vorrichtung zum Verbinden von Vorgarn in Spinnmaschinen

Country Status (5)

Country Link
EP (1) EP0709502B1 (de)
JP (1) JPH0931776A (de)
DE (1) DE69503334T2 (de)
ES (1) ES2117827T3 (de)
IT (1) IT1271046B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101779277B1 (ko) 2013-03-18 2017-09-18 봅스트 맥스 에스에이 이송 동안 플랫 물체를 배출하기 위한 디바이스

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5516981A (en) * 1979-02-09 1980-02-06 Murata Mach Ltd Pneumatic ending
DE3114538A1 (de) * 1981-04-10 1983-01-13 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und vorrichtung zum knotenfreien verbinden zweier faeden
JPS61257877A (ja) * 1985-04-12 1986-11-15 Murata Mach Ltd 糸継ノズルユニツト
DE3939881A1 (de) * 1989-12-01 1991-06-06 Rieter Ag Maschf Verfahren und vorrichtung zum verbinden von faserbaendern, faserlunten, vorgarnen und garnen

Also Published As

Publication number Publication date
EP0709502A1 (de) 1996-05-01
ES2117827T3 (es) 1998-08-16
DE69503334D1 (de) 1998-08-13
ITMI942192A0 (it) 1994-10-26
DE69503334T2 (de) 1998-12-17
JPH0931776A (ja) 1997-02-04
ITMI942192A1 (it) 1996-04-26
IT1271046B (it) 1997-05-26

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