EP0143925B1 - Cleaning devices for rotating rolls in textile machines - Google Patents

Cleaning devices for rotating rolls in textile machines Download PDF

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Publication number
EP0143925B1
EP0143925B1 EP84111164A EP84111164A EP0143925B1 EP 0143925 B1 EP0143925 B1 EP 0143925B1 EP 84111164 A EP84111164 A EP 84111164A EP 84111164 A EP84111164 A EP 84111164A EP 0143925 B1 EP0143925 B1 EP 0143925B1
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EP
European Patent Office
Prior art keywords
roller
working position
knife
stripping knife
stripping
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
Application number
EP84111164A
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German (de)
French (fr)
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EP0143925A1 (en
Inventor
Max Fahmüller
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.)
Rieter Ingolstadt Spinnereimaschinenbau AG
Original Assignee
Schubert und Salzer Maschinenfabrik AG
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Publication date
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Publication of EP0143925A1 publication Critical patent/EP0143925A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/76—Stripping or cleaning carding surfaces; Maintaining cleanliness of carding area
    • D01G15/80—Arrangements for stripping cylinders or rollers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
    • D06B23/30—Means for cleaning apparatus or machines, or parts thereof

Definitions

  • the invention relates to a device for cleaning rotating rollers of textile machines, in particular squeeze rollers, with a doctor blade, the front edge of which is pressed against the surface of the roller in the working position and forms a clamping line therewith.
  • the surface of the rollers In order to ensure a trouble-free passage of a nonwoven fabric or sliver through the clamping line of a rotating pair of rollers, the surface of the rollers must be constantly cleaned of adhering fibers and impurities. This also applies in particular to squeeze rollers on cards or draw frames on which vegetable impurities and fibers contained in the nonwoven fabric and crushed by the rollers remain sticking.
  • a manual removal of the pinched fiber material, in which the doctor blade is lifted off the roller, has the disadvantage that the roller remains uncleaned during this time and a break in the nonwoven fabric can thereby be caused.
  • the machine must then be shut down, which leads to a loss of production. A loss of production also occurs if the machine is shut down from the outset for safety reasons.
  • the object of the present invention is to reliably remove the fiber accumulations which impair the effectiveness of the doctor blade in a simple manner and without interrupting the cleaning of the roller, and thereby to ensure the functionality of the doctor blade.
  • the object is achieved in a device according to the preamble of claim 1 in that the doctor blade is movable while maintaining its contact in a second working position in which the knife body touches the roller and the front edge is at a distance from the roller.
  • FIG. 1 denotes a customer, from whose clothing a nonwoven fabric V is removed by means of a take-off roller 2.
  • the removal roller 2, to which a cleaning roller 3 is assigned, is followed by a pair of squeeze rollers 4 and 40, between which impurities, for example sheet and shell parts, contained in the nonwoven fabric V are crushed under high pressure.
  • the fiber fleece V emerging from the squeeze rollers 4 and 40 is combined to form a fiber band, in the exemplary embodiment by means of conveyor belts 5 tangent to and against one another, above the cleaning roller 3, a suction line 6 opens, through which fiber material entrained by the cleaning roller is sucked off.
  • Each of the two squeeze rollers 4 and 40 is assigned a doctor blade 7 and 8.
  • the knife body 70 or 80 ends in a sharp edge 71 or 81 which, in the usual working position shown in FIG. This working position is referred to below as the first working position.
  • the scraper blades 7 and 8 are fastened to supports 72 and 82, which are rotatably mounted in the machine frame, and consist entirely or only in a partial area Spring band steel which is pretensioned so that its front edge 71 or 81 is pressed against the squeeze rollers 4 and 40 with a predetermined pressure and a clamping line is formed.
  • a lever 73 and 83 is attached to one or both ends of the carriers 72 and 82.
  • the lever 73 is articulated to the piston rod 91 of an air cylinder 9, while the lever 83 is articulated on the housing of the air cylinder 9.
  • a compressed air line 92 with a valve 93 which can be a two- or three-way valve, connects the compressed air cylinder 9 to a compressed air device (not shown).
  • the scraper blades 7 and 8 are initially in their first working position (FIG. 2), in which their front edge 71 and 81 pressed against the squeeze rollers 4 and 40 scrapes off fibers and impurities from the roller surface. From this position, the doctor blades 7 and 8 are brought into the second working position shown in FIG. 1 at intervals, in which the knife bodies 70 and 80 touch the squeeze rollers 4 and 40 and the front edges 71 and 81 are at a distance from the roller body.
  • valve 93 is actuated so that compressed air flows into the compressed air cylinder 9 and pushes the piston rod 91 upwards, while the compressed air cylinder 9 moves downward due to the counter pressure.
  • a pressure directed against the squeezing rollers 4 and 40 is exerted on the stripping knife 7 via the lever 73 and on the stripping knife 8 via the lever 83 and the stripping knife is moved towards the squeezing roller.
  • the knife bodies 70 and 80 first come into tangential contact with the squeeze rollers 4 and 40 and then move along the roller surface, the leading edges 71 and 81 being released from the rollers in the end position, as shown in FIG. 1.
  • the doctor blade thus remains in constant contact with the roller, so that its cleaning is not interrupted and taken over by the knife body in the second working position.
  • the end position of the doctor blades 7 and 8 in the second working position and thus the distance between the front edges 70 and 80 from the squeeze rollers 4 and 40 can be limited by adjustable stops 94 and 95 which are arranged in the pivoting range of the levers 73 and 83 (FIG. 1 ). In general, it is sufficient to set the end position of the doctor blades 7 and 8 so that the front edges 71 and 81 of the doctor blades 7 and 8 are a fraction of a millimeter from the roller.
  • the fibers trapped between the front edge and the roller are released and taken away by the rotating roller, as are fibers and contaminants that have accumulated on the front edge in the first working position of the doctor blade and now in the between this and the roller existing gap are drawn in and transported away.
  • the frictional forces between the knife body and the roller encourage the fibers and impurities to be carried along by the roller.
  • the material entrained by the squeeze rollers is thrown by the squeeze roller 4 in the direction of the suction line 6 and by the squeeze roller 40 into the lower carding area.
  • doctor blades 7 and 8 In order to subject the doctor blades 7 and 8 to the self-cleaning described, it is sufficient to leave the doctor blades in the second working position only for a short time. Then the doctor blades 7 and 8 are moved back to their first working position.
  • valve 93 for the supply of the compressed air into the compressed air cylinder 9 and its discharge in order to move the doctor blades from one working position to the other can be done manually and aperiodically.
  • the working positions are preferably changed periodically at predetermined time intervals, which is effected, for example, by a cam disk 96 actuating valve 93 (FIG. 2).
  • the stripping knife 7 in the device shown in FIGS. the first to the second working position In contrast to the exemplary embodiment according to FIGS. 1 and 2, in which the stripping knives are moved into the second working position by a pressure force directed against the roller, the stripping knife 7 in the device shown in FIGS the first to the second working position.
  • a stationary compressed air cylinder 9 is used as the displacement device.
  • the doctor blade 7 is mounted on the piston rod 91 of the compressed air cylinder 9 and can be pivoted about a pin 74.
  • the piston rod 91 moves the scraper blade in a straight line along the roller surface from the first working position in which the front edge 71 rests on the squeeze roller 4 (FIG. 3) to the second work position in which the knife body 70 the squeeze roller 4 tangent and the front edge 71 is at a distance from the roller ( Figure 3a).
  • the end position of the doctor blade can also be determined and limited here by a stop if necessary.
  • FIGS. 4 and 4a For the squeeze roller 4, which is cleaned simultaneously by the stripping knife 7 and a stripping knife 7. Pressing and The stripping knife is moved using the same means and in the same way as in FIGS. 3 and 3a.
  • the stripping knife 7 has been moved into the second working position, in which the knife body 70 touches the squeeze roller 4 and the front edge 71 is exposed, while the stripping knife 7 'assumes the first working position with the front edge 71' resting on the roller surface.
  • the fibers and impurities released by the front edge 71 of the doctor blade 7 are taken along by the squeeze roller 4 and flung in the direction of the suction line 6 shown in FIG.
  • the stripping knife 7 is then moved back into the first working position and the stripping knife 7 'is shifted into the second working position, in which fibers and impurities released from the front edge 71' are first taken along by the squeeze roller 4 to the front edge 71 of the stripping knife 7 (FIG. 4a ) and, when the scraper blades 7 and 7 'have returned to the position according to FIG. 4, are thrown towards the suction line.
  • This process is repeated, preferably periodically, the time intervals in which the two doctor blades 7 and 7 'are alternately moved into the second working position and the duration in which they remain in this position by appropriate setting of the cam disk 96 actuating the valves ( Figure 2) or can be determined by another device known for this purpose.
  • any other suitable device for moving the doctor blade can be used or the mechanical movement can be replaced by a manual one.
  • the invention can also be used advantageously with other essentially smooth rollers.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Reinigen rotierender Walzen von Textilmaschinen, insbesondere von Quetschwalzen, mit einem Abstreifmesser, dessen Vorderkante in der Arbeitsstellung gegen die Oberfläche der Walze gedrückt ist und mit dieser eine Klemmlinie bildet.The invention relates to a device for cleaning rotating rollers of textile machines, in particular squeeze rollers, with a doctor blade, the front edge of which is pressed against the surface of the roller in the working position and forms a clamping line therewith.

Um einen störungsfreien Durchlauf eines Faservlieses oder Faserbandes durch die Klemmlinie eines rotierenden Walzenpaares sicherzustellen, muß die Oberfläche der Walzen ständig von anhaftenden Fasern und Verunreinigungen gesäubert werden. Dies gilt insbesondere auch für Quetschwalzen an Karden oder Strecken, an denen in verstärktem Maß im Faservlies enthaltene und durch die Walzen zermalmte pflanzliche Verunreinigungen sowie Fasern Kleben bleiben.In order to ensure a trouble-free passage of a nonwoven fabric or sliver through the clamping line of a rotating pair of rollers, the surface of the rollers must be constantly cleaned of adhering fibers and impurities. This also applies in particular to squeeze rollers on cards or draw frames on which vegetable impurities and fibers contained in the nonwoven fabric and crushed by the rollers remain sticking.

Es ist bekannt, für die die Reinigung von Walzen mit im wesentlichen glatter Oberfläche, wie Quetschwalzen und Streckwerkwalzen, stationäre Abstreifmesser oder Abstreifer zu verwenden, deren Vorderkante gegen die Walzenoberfläche gepreßt wird (DE-OS-1 510 318, DE-PS-1166669). Im Verlauf der Walzenreinigung setzen sich jedoch von der Walze abgestreifte Verunreinigungen und Fasern an der Messervorderkante ab, die von Zeit zu Zeit entfernt werden müssen. Vor allem ist es wichtig, daß zwischen der Walze und dem Abstreifmesser eingeklemmtes Fasermaterial entfernt wird, da diese eingeklemmten Fasern die Reinigungswirkung des Abstreifmessers verschlechtern und bei gröserer Ansammlung das Abstreifmesser gänzlich außer Funktion setzen können.It is known to use stationary scraper blades or scrapers for the cleaning of rollers with an essentially smooth surface, such as squeeze rollers and drafting rollers, the front edge of which is pressed against the roller surface (DE-OS-1 510 318, DE-PS-1166669) . During the course of the roller cleaning, however, dirt and fibers stripped from the roller settle on the leading edge of the knife, which must be removed from time to time. Above all, it is important that fiber material pinched between the roller and the doctor blade is removed, since these pinched fibers impair the cleaning effect of the doctor blade and, if they accumulate, can completely put the doctor blade out of operation.

Eine manuelle Beseitigung des eingeklemmten Fasermaterials, bei der das Abstreifmesser von der Walze abgehoben wird, hat den Nachteil, daß die Walze in dieser Zeit ungereinigt bleibt und dadurch ein Bruch des Faservlieses verursacht werden kann. Die Maschine muß dann abgestellt werden, was zu einem Produktionsverlust führt. Ein Produktionsverlust tritt auch dann ein, wenn die Maschine von vornherein aus Sicherheitsgründen abgestellt wird.A manual removal of the pinched fiber material, in which the doctor blade is lifted off the roller, has the disadvantage that the roller remains uncleaned during this time and a break in the nonwoven fabric can thereby be caused. The machine must then be shut down, which leads to a loss of production. A loss of production also occurs if the machine is shut down from the outset for safety reasons.

Es wurde daher schon vorgeschlagen, das vor und auf dem Abstreifmesser abgelagerte Material mittels eines auf einem rotierenden Zylinder befestigten Lappens zu entfernen und in Richtung eines Saugelementes zu schleudern (DE-OS-1 5-10318). Durch die ruckartige Bewegung des Lappens sollen dabei auch zwischen dem Abstreifmesser und der Walze eingeklemmte Fasern losgelöst oder zerrissen werden. Diese bekannte Vorrichtung ermöglicht es zwar, das Abstreifmesser in seiner Arbeitsstellung zu belassen, so daß die Reinigung der Walze nicht unterbrochen wird. Ihre Reinigungswirkung ist jedoch hinsichtlich der Entfernung eingeklemmter Fasern unbefriedigend, da von diesen Fasern überwiegend nur Teilstücke abgerissen werden und die verbleibenden Faserreste eingeklemmt bleiben.It has therefore already been proposed to remove the material deposited in front of and on the doctor blade by means of a cloth attached to a rotating cylinder and to spin it in the direction of a suction element (DE-OS-1 5-10318). The jerky movement of the flap should also loosen or tear fibers trapped between the doctor blade and the roller. This known device makes it possible to leave the doctor blade in its working position, so that the cleaning of the roller is not interrupted. However, their cleaning effect is unsatisfactory with regard to the removal of pinched fibers, since only parts of these fibers are torn off, and the remaining fiber remnants remain pinched.

Aufgabe der vorliegenden Erfindung ist es, die die Wirksamkeit des Abstreifmessers beeinträchtigenden Faseransammlungen auf einfache Weise und ohne die Reinigung der Walze zu unterbrechen zuverlässig zu entfernen und dadurch die Funktionstüchtigkeit des Abstreifmessers sicherzustellen.The object of the present invention is to reliably remove the fiber accumulations which impair the effectiveness of the doctor blade in a simple manner and without interrupting the cleaning of the roller, and thereby to ensure the functionality of the doctor blade.

Die Aufgabe wird bei einer Vorrichtung gemäß dem Oberbegriff des Anspruches 1 erfindungsgemäß dadurch gelöst, daß das Abstreifmesser unter Beibehaltung seines Kontaktes in eine zweite Arbeitsstellung bewegbar ist, in welcher der Messerkörper die Walze tangiert und die Vorderkante einen Abstand zur Walze hat.The object is achieved in a device according to the preamble of claim 1 in that the doctor blade is movable while maintaining its contact in a second working position in which the knife body touches the roller and the front edge is at a distance from the roller.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous developments of the invention are described in the subclaims.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen und in Verbindung mit Quetschwalzen, für die sie insbesondere bestimmt ist, beschrieben. Es zeigen in schematischer Darstellung und von der Seite gesehen

  • Figur 1 den Auslaufteil einer Karde mit einem Paar Quetschwalzen und in die zweite Arbeitsstellung bewegten Abstreifmessern ;
  • Figur 2 die Quetschwalzen aus Figur 1 mit Abstreifmessern in der bekannten Arbeitsstellung ;
  • Figur 3 und 3a eine zweite Ausführungsform der Bewegung des Abstreifmessers in die zweite Arbeitsstellung ;
  • Figuren 4 und 4a eine Walze mit zwei Abstreifmessern, die abwechselnd in die zweite Arbeitsstellung bewegt werden.
Embodiments of the invention are described below with reference to the drawings and in connection with squeeze rollers, for which it is particularly intended. It shows a schematic representation and seen from the side
  • Figure 1 shows the outlet part of a card with a pair of squeeze rollers and scraper blades moved into the second working position;
  • FIG. 2 shows the squeeze rolls from FIG. 1 with doctor blades in the known working position;
  • Figures 3 and 3a a second embodiment of the movement of the doctor blade in the second working position;
  • Figures 4 and 4a a roller with two doctor blades, which are moved alternately in the second working position.

Mit 1 ist in Figur 1 ein Abnehmer bezeichnet, von dessen Garnitur ein Faservlies V mittels einer Abnahmewalze 2 abgenommen wird. Auf die Abnahmewalze 2, der eine Putzwalze 3 zugeordnet ist, folgt ein Paar Quetschwalzen 4 und 40, zwischen denen im Faservlies V enthaltene Verunreinigungen, beispielsweise Blatt- und Schalenteile, unter hohem Druck zermalmt werden. Das aus den Quetschwalzen 4 und 40 austretende Faservlies V wird zu einem Faserband zusammengefaßt, im Ausfürungsbeispiel mittels die Quetschwalzen tangierender und gegeneinander laufender Transportbänder 5. Oberhalb der Putzwalze 3 mündet eine Saugleitung 6, durch die hindurch von der Putzwalze mitgenommenes Fasermaterial abgesaugt wird.1 in FIG. 1 denotes a customer, from whose clothing a nonwoven fabric V is removed by means of a take-off roller 2. The removal roller 2, to which a cleaning roller 3 is assigned, is followed by a pair of squeeze rollers 4 and 40, between which impurities, for example sheet and shell parts, contained in the nonwoven fabric V are crushed under high pressure. The fiber fleece V emerging from the squeeze rollers 4 and 40 is combined to form a fiber band, in the exemplary embodiment by means of conveyor belts 5 tangent to and against one another, above the cleaning roller 3, a suction line 6 opens, through which fiber material entrained by the cleaning roller is sucked off.

Jeder der beiden Quetschwalzen 4 und 40 ist ein Abstreifmesser 7 und 8 zugeordnet. Deren Messerkörper 70 bzw. 80 läuft in eine scharfe Kante 71 bzw. 81 aus, die in der in Figur 2 gezeigten üblichen Arbeitsstellung unter einem bestimmten, für die Walzenreinigung günstigen Anstellwinkel an der Walzenoberfläche anliegt. Diese Arbeitsstellung wird im folgenden als erste Arbeitsstellung bezeichnet. Die-Abstreifmesser 7 und 8 sind an drehbar im Maschinengestell gelagerten Trägern 72 bzw. 82 befestigt und bestehen gänzlich oder auch nur in einem Teilbereich aus Federbandstahl, der vorgespannt ist, so daß ihre Voderkante 71 bzw. 81 mit einem vorbestimmten Druck gegen die Quetschwalzen 4 und 40 gepreßt und eine Klemmlinie gebildet wird. An einem oder beiden Enden der Träger 72 und 82 ist jeweils ein Hebel 73 und 83 befestigt. Der Hebel 73 ist mit der Kolbenstange 91 eines Druckluftzylinders 9 gelenkig verbunden, während der Hebel 83 am Gehäuse des Druckluftzylinders 9 angelenkt ist. Eine Druckluftleitung 92 mit einem Ventil 93, das ein Zwei- oder Dreiwegeventil sein kann, verbindet den Druckluftzylinder 9 mit einer Druckluftvorrichtung (nicht gezeigt).Each of the two squeeze rollers 4 and 40 is assigned a doctor blade 7 and 8. The knife body 70 or 80 ends in a sharp edge 71 or 81 which, in the usual working position shown in FIG. This working position is referred to below as the first working position. The scraper blades 7 and 8 are fastened to supports 72 and 82, which are rotatably mounted in the machine frame, and consist entirely or only in a partial area Spring band steel which is pretensioned so that its front edge 71 or 81 is pressed against the squeeze rollers 4 and 40 with a predetermined pressure and a clamping line is formed. A lever 73 and 83 is attached to one or both ends of the carriers 72 and 82. The lever 73 is articulated to the piston rod 91 of an air cylinder 9, while the lever 83 is articulated on the housing of the air cylinder 9. A compressed air line 92 with a valve 93, which can be a two- or three-way valve, connects the compressed air cylinder 9 to a compressed air device (not shown).

Im laufenden Betrieb befinden sich die Abstreifmesser 7 und 8 zunächst in ihrer ersten Arbeitsstellung (Figur 2), in der ihre gegen die Quetschwalzen 4 und 40 gepreßte Vorderkante 71 und 81 Fasern und Verunreinigungen von der Walzenoberfläche abschabt. Aus dieser Stellung wird das Abstreifmesser 7 und 8 in Zeitabständen in die in Figur 1 gezeigte zweite Arbeitsstellung gebracht, in der die Messerkörper 70 und 80 die Quetschwalzen 4 und 40 tangieren und die Vorderkanten 71 und 81 einen Abstand vom Walzenkörper haben.During operation, the scraper blades 7 and 8 are initially in their first working position (FIG. 2), in which their front edge 71 and 81 pressed against the squeeze rollers 4 and 40 scrapes off fibers and impurities from the roller surface. From this position, the doctor blades 7 and 8 are brought into the second working position shown in FIG. 1 at intervals, in which the knife bodies 70 and 80 touch the squeeze rollers 4 and 40 and the front edges 71 and 81 are at a distance from the roller body.

Hierzu wird das Ventil 93 betätigt, so daß Druckluft in den Druckluftzylinder 9 strömt und die Kolbenstange 91 aufwärts drückt, während der Druckluftzylinder 9 durch den Gegendruck sich abwärts bewegt. Dadurch wird auf das Abstreifmesser 7 über den Hebel 73 und auf das Abstreifmesser 8 über den Hebel 83 ein gegen die Quetschwalzen 4 und 40 gerichteter Druck ausgeübt und das Abstreifmesser zur Quetschwalze hin bewegt. Bei fortgesetztem Druck kommen zunächst die Messerkörper 70 und 80 in tangentiale Anlage an den Quetschwalzen 4 und 40 und bewegen sich dann entlang der Walzenoberfläche, wobei in der Endstellung die Vorderkanten 71 und 81 von den Walzen freikommen, wie in Figur 1 gezeigt. Während des Überganges von der ersten in die zweite Arbeitsstellung bleibt das Abstreifmesser somit ständig in Kontakt mit der Walze, so daß deren Reinigung nicht unterbrochen und in der zweiten Arbeitsstellung vom Messerkörper übernommen wird.For this purpose, the valve 93 is actuated so that compressed air flows into the compressed air cylinder 9 and pushes the piston rod 91 upwards, while the compressed air cylinder 9 moves downward due to the counter pressure. As a result, a pressure directed against the squeezing rollers 4 and 40 is exerted on the stripping knife 7 via the lever 73 and on the stripping knife 8 via the lever 83 and the stripping knife is moved towards the squeezing roller. With continued printing, the knife bodies 70 and 80 first come into tangential contact with the squeeze rollers 4 and 40 and then move along the roller surface, the leading edges 71 and 81 being released from the rollers in the end position, as shown in FIG. 1. During the transition from the first to the second working position, the doctor blade thus remains in constant contact with the roller, so that its cleaning is not interrupted and taken over by the knife body in the second working position.

Die Endlage der Abstreifmesser 7 und 8 in der zweiten Arbeitsstellung und damit der Abstand der Vorderkanten 70 und 80 von den Quetschwalzen 4 und 40 kann durch einstellbare Anschläge 94 und 95, die im Schwenkbereich der Hebel 73 und 83 angeordnet sind, begrenzt werden (Figur 1). Im allgemeinen reicht es aus, die Endlage dr Abstreifmesser 7 und 8 so festzulegen, daß die Vorderkanten 71 und 81 der Abstreifmesser 7 und 8 einen Abstand von einem Bruchteil eines Millimeters zur Walze haben.The end position of the doctor blades 7 and 8 in the second working position and thus the distance between the front edges 70 and 80 from the squeeze rollers 4 and 40 can be limited by adjustable stops 94 and 95 which are arranged in the pivoting range of the levers 73 and 83 (FIG. 1 ). In general, it is sufficient to set the end position of the doctor blades 7 and 8 so that the front edges 71 and 81 of the doctor blades 7 and 8 are a fraction of a millimeter from the roller.

Durch die Wegbewegung der Vorderkante des Abstreifmessers von der Walze werden die zwischen der Vorderkante und der Walze eingeklemmten Fasern freigegeben und von der umlaufenden Walze mitgenommen, ebenso Fasern und Verunreinigungen, die sich in der ersten Arbeitsstellung des Abstreifmessers an dessen Vorderkante angesammelt haben und nun in den zwischen dieser und der Walze vorhandenen Spalt hineingezogen und weggefördert werden. Dabei begünstigen die zwischen dem Messerkörper und der Walze vorhandenen Reibungskräfte die Mitnahme der Fasern und Verunreinigungen durch die Walze. Das von den Quetschwalzen mitgenommene Material wird, nachdem es die vom Messerkörper gebildete Klemmstelle passiert hat, von der Quetschwalze 4 in Richtung zur Saugleitung 6 und von der Quetschwalze 40 in den unteren Kardenraum geschleudert.By moving the front edge of the doctor blade away from the roller, the fibers trapped between the front edge and the roller are released and taken away by the rotating roller, as are fibers and contaminants that have accumulated on the front edge in the first working position of the doctor blade and now in the between this and the roller existing gap are drawn in and transported away. The frictional forces between the knife body and the roller encourage the fibers and impurities to be carried along by the roller. After it has passed the nip formed by the knife body, the material entrained by the squeeze rollers is thrown by the squeeze roller 4 in the direction of the suction line 6 and by the squeeze roller 40 into the lower carding area.

Um die Abstreifmesser 7 und 8 der beschriebenen Selbstreinigung zu unterwerfen, genügt es, die Abstreifmesser nur kurze Zeit in der zweiten Arbeitsstellung zu belassen. Danach werden die Abstreifmesser 7 und 8 wieder in ihre erste Arbeitsstellung bewegt.In order to subject the doctor blades 7 and 8 to the self-cleaning described, it is sufficient to leave the doctor blades in the second working position only for a short time. Then the doctor blades 7 and 8 are moved back to their first working position.

Die Betätigung des Ventils 93 für die Zufuhr der Druckluft in den Druckluftzylinder 9 und ihre Abführung, um die Abstreifmesser von einer Arbeitsstellung in die andere zu bewegen, kann manuell und aperiodisch erfolgen. Vorzugsweise erfolgt jedoch ein periodischer Wechsel der Arbeitsstellungen in vorbestimmten Zeitabständen, der beispielsweise durch eine das Ventil 93 betätigende Nockenscheibe 96 bewirkt wird (Figur 2).The actuation of the valve 93 for the supply of the compressed air into the compressed air cylinder 9 and its discharge in order to move the doctor blades from one working position to the other can be done manually and aperiodically. However, the working positions are preferably changed periodically at predetermined time intervals, which is effected, for example, by a cam disk 96 actuating valve 93 (FIG. 2).

Im Gegensatz zum Ausführungsbeispiel gemäß Figur 1 und 2, bei dem die Abstreifmesser durch eine gegen die Walze gerichtete Druckkraft in die zweite Arbeitsstellung bewegt werden, wird bei der in Figur 3 und 3a gezeigten Vorrichtung das Abstreifmesser 7 unter Beibehaltung seines Kontaktes zur Quetschwalze 4 geradlinig aus der ersten in die zweite Arbeitsstellung verschoben. Als Verschiebeeinrichtung wird ein ortsfester Druckluftzylinder 9 verwendet. Das Abstreifmesser 7 ist auf der Kolbenstange 91 des Druckluftzylinders 9 gelagert und um einen Zapfen 74 schwenkbar. Eine Feder 75 drückt das Abstreifmesser 7 an die Oberfläche der Quetschwalze 4.In contrast to the exemplary embodiment according to FIGS. 1 and 2, in which the stripping knives are moved into the second working position by a pressure force directed against the roller, the stripping knife 7 in the device shown in FIGS the first to the second working position. A stationary compressed air cylinder 9 is used as the displacement device. The doctor blade 7 is mounted on the piston rod 91 of the compressed air cylinder 9 and can be pivoted about a pin 74. A spring 75 presses the doctor blade 7 against the surface of the nip roller 4.

Bei Zufuhr von Druckluft in den Druckluftzylinder 9 bewegt die Kolbenstange 91 das Abstreifmesser geradlinig entlang der Walzenoberfläche aus der ersten Arbeitsstellung, in der die Vorderkante 71 an der Quetschwalze 4 anliegt (Figur 3) in die zweite Arbeitsstellung, in welcher der Messerkörper 70 die Quetschwalze 4 tangiert und die Vorderkante 71 einen Abstand zur Walze hat (Figur 3a). Die Endlage des Abstreifmessers kann gegebenenfalls auch hier durch einen Anschlag festgelegt und begrenzt werden.When compressed air is supplied to the compressed air cylinder 9, the piston rod 91 moves the scraper blade in a straight line along the roller surface from the first working position in which the front edge 71 rests on the squeeze roller 4 (FIG. 3) to the second work position in which the knife body 70 the squeeze roller 4 tangent and the front edge 71 is at a distance from the roller (Figure 3a). The end position of the doctor blade can also be determined and limited here by a stop if necessary.

Bei der Verarbeitung von Fasermaterial mit hohem Anteil an pflanzlichen Verunreinigungen und dementsprechend höherem Verschmutzungsgrad der Quetschwalzen kann es zweckmäßig sein, jeder der beiden Quetschwalzen zwei Abstreifmesser zuzuordnen und diese abwechselnd in die zweite Arbeitsstellung zu bewegen. Eine solche Anordnung ist in Figur 4 und 4a für die Quetschwalze 4 gezeigt, die gleichzeitig von dem Abstreifmesser 7 und einem Abstreifmesser 7 gereinigt wird. Das Andrücken und Verschieben der Abstreifmesser erfolgt mit den gleichen Mitteln und in der gleichen Weise wie in Figur 3 und 3a. In Figur 4 wurde das Abstreifmesser 7 in die zweite Arbeitsstellung bewegt, in welcher der Messerkörper 70 die Quetschwalze 4 tangiert und die Vorderkante 71 freiliegt, während das Abstreifmesser 7' die erste Arbeitsstellung mit Anlage der Vorderkante 71' an der Walzenoberfläche einnimmt. Die von der Vorderkante 71 des Abstreifmessers 7 freigegebenen Fasern und Verunreinigungen werden von der Quetschwalze 4 mitgenommen und in Richtung zu der in Figur 1 gezeigten Saugleitung 6 geschleudert.When processing fiber material with a high proportion of vegetable impurities and a correspondingly higher degree of contamination of the squeeze rollers, it may be advisable to assign two scraper blades to each of the two squeeze rollers and to move them alternately into the second working position. Such an arrangement is shown in FIGS. 4 and 4a for the squeeze roller 4, which is cleaned simultaneously by the stripping knife 7 and a stripping knife 7. Pressing and The stripping knife is moved using the same means and in the same way as in FIGS. 3 and 3a. In FIG. 4, the stripping knife 7 has been moved into the second working position, in which the knife body 70 touches the squeeze roller 4 and the front edge 71 is exposed, while the stripping knife 7 'assumes the first working position with the front edge 71' resting on the roller surface. The fibers and impurities released by the front edge 71 of the doctor blade 7 are taken along by the squeeze roller 4 and flung in the direction of the suction line 6 shown in FIG.

Das Abstreifmesser 7 wird dann wieder in die erste Arbeitsstellung zurückbewegt und das Abstreifmesser 7' in die zweite Arbeitsstellung verschoben, in der von der Vorderkante 71' freigegebene Fasern und Verunreinigungen von der Quetschwalze 4 zunächst bis zur Vorderkante 71 des Abstreifmessers 7 mitgenommen werden (Figur 4a) und, wenn die Abstreifmesser 7 und 7' wieder in die Position gemäß Figur 4 gelangt sind, zur Saugleitung hin geschleudert werden. Dieser Vorgang wiederholt sich, vorzugsweise periodisch, wobei die Zeitabstände, in der die beiden Abstreifmesser 7 und 7' abwechselnd in die zweite Arbeitsstellung bewegt werden und die Dauer, in der sie in dieser Stellung verbleiben, durch entsprechende Einstellung der die Ventile betätigenden Nockenscheibe 96 (Figur 2) oder durch eine andere hierfür bekannte Vorrichtung festgelegt werden kann.The stripping knife 7 is then moved back into the first working position and the stripping knife 7 'is shifted into the second working position, in which fibers and impurities released from the front edge 71' are first taken along by the squeeze roller 4 to the front edge 71 of the stripping knife 7 (FIG. 4a ) and, when the scraper blades 7 and 7 'have returned to the position according to FIG. 4, are thrown towards the suction line. This process is repeated, preferably periodically, the time intervals in which the two doctor blades 7 and 7 'are alternately moved into the second working position and the duration in which they remain in this position by appropriate setting of the cam disk 96 actuating the valves ( Figure 2) or can be determined by another device known for this purpose.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt. So kann beispielsweise anstelle eines Druckluftzylinders jede andere geeignete Vorrichtung für die Bewegung des Abstreifmessers verwendet werden oder auch die mechanische Bewegung durch eine manuelle ersetzt werden. Ebenso ist die Erfindung auch bei anderen im wesentlichen glatten Walzen mit Vorteil anwendbar.The invention is not restricted to the exemplary embodiments described. For example, instead of a compressed air cylinder, any other suitable device for moving the doctor blade can be used or the mechanical movement can be replaced by a manual one. The invention can also be used advantageously with other essentially smooth rollers.

Claims (7)

1. A device for cleaning rotating rollers of textile machines, especially crushing rollers, with a stripping knife, the front edge of which is pressed against the surface of the roller in the working position, characterized in that the stripping knife (7 ; 8) while maintaining its contact with the roller is adapted to be moved at intervals into a second working position in which the knife body (70) touches the roller and the front edge (71 ; 81) is spaced apart from the roller.
2. A device as claimed in claim 1, characterized in that the stripping knife (7 ; 8) is adapted to be moved periodically into the second working position.
3. A device as claimed in claim 1 or 2, characterized in that the stripping knife (7 ; 8) is adapted to be moved into the second working position by means of a pressure force directed towards the roller.
4. A device as claimed in claim 3, characterized in that the stripping knife is connected to a compressed air cylinder (9), which produces the pressure force, by means of a lever (73 ; 83) fastened to the knife support (72 ; 82).
5. A device as claimed in any of claims 1 to 4, characterized in that the end position of the stripping knife (7 ; 8) is limited by adjustable stops (94 ; 95).
6. A device as claimed in claim 1, characterized in that the stripping knife can be displaced along the roller surface into the second working position by a displacement means.
7. A device as claimed in any of claims 1 to 6, characterized in that two stripping knifes (7 ; 7') are assigned to the roller which are adapted to be moved into the second working position alternately.
EP84111164A 1983-10-05 1984-09-19 Cleaning devices for rotating rolls in textile machines Expired EP0143925B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3336184 1983-10-05
DE3336184A DE3336184C2 (en) 1983-10-05 1983-10-05 Device for cleaning rotating rollers of textile machines

Publications (2)

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EP0143925A1 EP0143925A1 (en) 1985-06-12
EP0143925B1 true EP0143925B1 (en) 1987-01-21

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US (1) US4590647A (en)
EP (1) EP0143925B1 (en)
DE (2) DE3336184C2 (en)

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Also Published As

Publication number Publication date
DE3336184C2 (en) 1986-03-06
US4590647A (en) 1986-05-27
DE3336184A1 (en) 1985-10-31
DE3462157D1 (en) 1987-02-26
EP0143925A1 (en) 1985-06-12

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