EP1333983B1 - Marking device and extrusion system with a marking device of this type - Google Patents

Marking device and extrusion system with a marking device of this type Download PDF

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Publication number
EP1333983B1
EP1333983B1 EP01980507A EP01980507A EP1333983B1 EP 1333983 B1 EP1333983 B1 EP 1333983B1 EP 01980507 A EP01980507 A EP 01980507A EP 01980507 A EP01980507 A EP 01980507A EP 1333983 B1 EP1333983 B1 EP 1333983B1
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EP
European Patent Office
Prior art keywords
line
pressure
writing fluid
writing
fluid container
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EP01980507A
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German (de)
French (fr)
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EP1333983A1 (en
Inventor
Andreas Beringer
Erhard Haun
Günther ALTENKIRCH
Hans Müller
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Roehm GmbH Darmstadt
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Roehm GmbH Darmstadt
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor

Definitions

  • the invention relates to a labeling device with a pump, a writing fluid container for receiving a writing fluid and a write head, wherein a first line and a second line is provided, can be guided by the compressed air from the pump in the writing fluid container and the writing fluid to the write head. Furthermore, the invention relates to an extrusion system with such a labeling device.
  • the document DE 41 12 033 C2 discloses a device for writing and drawing, in particular for a plotter.
  • the described device comprises a pump, a chamber, which is divided into two sections by a movable piston, and a write head.
  • the pump drives compressed air via a first line into the first section of the chamber, so that pressure is exerted on the piston.
  • the ink is accommodated, which is driven due to the pressure transmitted by the piston through a second line to the write head.
  • a pressure sensor is arranged, which measures the pressure within the first line.
  • the piston When the ink is completely pushed out of the second section of the chamber, the piston has reached a position in which the air passes out of the first section, past the piston, through the second section, the second line and the write head, so that a pressure drop in the first line is caused. This pressure drop is detected by a pressure sensor in the first line to output a signal indicative of the depleted ink supply.
  • the known device for writing and drawing has the disadvantage that in case of damage to the second line, such. B. a burst of the same, the ink can flow freely. This leads on the one hand to contamination of the product to be labeled and on the other hand to an increased risk of fire when a combustible ink is used.
  • a labeling device which has a monitoring device for measuring the pressure in a supply tube.
  • the feed rate and feed pressure should be regulated.
  • Document EP 933217-A2 discloses a labeling device which has a monitoring device for measuring the pressure and the temperature of a print head.
  • the invention is therefore an object of the invention to provide a labeling device that prevents leakage caused by leakage o. ⁇ . Leakage of the writing fluid. Furthermore, the invention has for its object to provide an extrusion line with such a labeling device.
  • the invention provides a marking device with a pump, a writing fluid container for receiving a writing fluid and a writing head. Between the pump and the writing fluid container, a first line is arranged, through which the compressed air of the pump can be pressed into the writing fluid container. In addition, a second line is provided, through which the writing fluid can be pressed from the writing fluid reservoir to the recording head. In the second line, a monitoring device for measuring the pressure and for comparing the measured pressure with a predetermined pressure limit is provided.
  • the pressure within the second line is always above the predetermined pressure limit value during operation of the labeling device and with an intact second line. Should a hole, a crack or the like appear in the second line, the undershooting of the pressure limit value would be determined by the comparison carried out by the monitoring device, whereupon the writing fluid container is vented.
  • a shut-off device is provided in the first line, which can be transferred from a flow position into a shut-off position in which the pump is locked and the container is vented.
  • a shut-off device may for example be formed by a valve which is arranged within the first line and subdivided into sub-lines. In the flow position, such a valve would connect the sub-lines, while in the shut-off position the leading to the pump part line would be blocked and the leading to the writing fluid reservoir part line would be vented.
  • the monitoring device comprises in a preferred embodiment a branching off from the second line third line with an adjoining pressure switch.
  • the pressure switch is connected to the obturator via a first control line, can be passed via the control signals for the obturator.
  • Under a pressure switch is a mechanical one To understand switch that is at a pressure above the predetermined pressure limit in a first position and merges with a decrease in pressure below the predetermined pressure limit in a second position, wherein the switching point may be variable. This represents a particularly simple measurement and comparison method.
  • the second line is arranged above the writing fluid container such that the writing fluid flows back into the vented writing fluid container. In this way, it is ensured that the writing liquid present in the second line does not remain within the second line after the emergence of the hole and thus runs out, but instead flows back into the writing fluid container due to its own weight. The prerequisite for this, however, is that the capillary action within the second line is low.
  • a pressure reduction device is provided in the first line, so that pressure fluctuations can be largely prevented.
  • At least one filter is provided in the second line, which filters out the impurities and particles present in the writing fluid.
  • the write head has at least one nozzle, which is controlled via a control unit.
  • the control unit is connected to the monitoring device via a second control line, via which control signals for the monitoring device can be passed. If all the nozzles of the Write head are closed, sends the control unit via the second control line a corresponding signal to the monitoring device, which in turn sets a higher predetermined pressure limit.
  • This embodiment is advantageous in that the opening of the nozzles causes a certain pressure drop within the second conduit. Since this pressure drop should not be evaluated as damage to the line, the predetermined pressure limit is chosen to be correspondingly small.
  • the control unit allows a corresponding adjustment of the predetermined pressure limit, so that even the smallest damage of the second line can be detected.
  • the monitoring device is arranged in a preferred embodiment of the labeling device such that the measurement of the pressure within the second line takes place immediately before the write head.
  • the extrusion system according to the invention has a labeling device of the type described above, wherein the labeling device of the lettering of the extruded material is used.
  • a secure or dense labeling device is necessary because it is often worked with highly flammable writing fluid. Leaking the writing fluid would contaminate the extruded material, more serious, however, that it may come when mounting protective films on the extruded material to discharge static charges, which ultimately cause the ignition of the combustible writing fluid.
  • a labeling device for the operator, the extruded material and the extrusion line a considerable Hazardous source. With the help of the above-described labeling device this risk is eliminated.
  • Fig. 1 shows a schematic representation of the labeling device according to the invention.
  • the labeling device according to the invention has a pump 2, which is connected via a first line 4 with a writing fluid container 6.
  • the first line 4 protrudes into an upper region of the writing fluid container 6, which is filled with a writing fluid 8.
  • the writing fluid 8 may be an ink, such as. Water-based, ethanol, isopropanol, ethyl acetate, MEK, high temperature or specialty ink.
  • From the writing fluid reservoir 6 extends from the lower portion of the same a second line 10 to a write head 12.
  • the write head 12 has a plurality of nozzles 14 which can be opened or closed by means of a control unit 16.
  • a filter 18 for filtering the writing liquid 8 is further arranged, while in the first line 4, a pressure reducing device 20 is arranged in the form of a valve.
  • the pressure switch 24 is in the illustrated embodiment mechanical switch, which is at a pressure above a predetermined pressure limit in a first position and merges with a decrease in pressure below the predetermined pressure limit in a second position.
  • the pressure switch 24 is connected via a first control line 26 with a shut-off device 28, also the pressure switch 24 is connected via a further control line 30 to the pump 2, wherein the control line 30 is optional.
  • the obturator 28 is disposed within the first conduit 4 and can be transferred from a flow position ( Figures 1 and 2) to a shut-off position ( Figure 3) in which the pump 2 is shut off and the writing fluid reservoir 6 is vented.
  • Fig. 1 shows the labeling device in normal undisturbed operation.
  • the pump 2 pushes air through the first line 4, via the pressure reducing device 20 and the obturator 28, which is located in the flow position, in the writing fluid tank 6.
  • the writing fluid container 6 forms an air bubble, due to the pump 2 generated pressure on the underlying writing fluid 8 presses.
  • the writing liquid 8 is driven into the second line 10 to the write head 12 and into the third line 22 of the pressure switch 24, wherein a filtering of the writing liquid 8 through the filter 18 takes place.
  • the pressure within the second or third line 10, 22 is above a predetermined pressure limit value 32 (FIG. 4) during undisturbed operation of the labeling device.
  • FIG. 4 shows in section a of the illustrated diagram the profile 34 of the pressure p in the second and third, respectively Line 10,22 over the time t for Fig. 1. The more nozzles 14 are opened, the more the pressure drops from p, but drops - even if all the nozzles 14 are open - not below the predetermined pressure limit 32nd
  • FIG. 2 shows the labeling device when the second line 10 bursts at a point A at the time t 1 .
  • the pressure p within the second or third line 10, 22 decreases, as shown in section b of the diagram shown in FIG.
  • the pressure switch 24 changes from the first position to the second position described above, whereupon a corresponding signal is sent to the first control line 26 via the first control line 26 Shut-off 28 is transmitted.
  • the obturator 28 is transferred by the signal from the flow position into the shut-off position (FIG. 3). In the shut-off position, the portion of the first conduit 4 extending from the pump 2 to the obturator 28 is closed, whereas the portion of the first conduit 4 extending between the obturator 28 and the reservoir fluid reservoir 6 is vented the air can escape from the writing fluid container 6 through the first conduit 4 and the obturator 28 in the direction of the arrow 36.
  • the writing fluid 8 from the second conduit 10 can flow back into the writing fluid container 6 again. Further leakage of the writing fluid 8 at the point A is thus prevented. Simultaneously with the signal via the signal line 26, a signal can be sent via the signal line 30, so that the pump 2 stops the promotion. However, this is not absolutely necessary since the supply of additional compressed air is prevented anyway by the obturator 28 in the shut-off position.
  • FIG. 4 also shows the case that only one hole in the second line 10 occurs which does not lead to a complete pressure loss (dot-dashed representation). Also in this case, the labeling device according to the invention reacts in the manner described above.
  • a second control line 38 is provided between the control unit 16 and the pressure switch 24.
  • a corresponding signal can be sent to the pressure switch 24 via the second control line 38, whereby the predetermined pressure limit value 40 (FIG. 5) is increased.
  • the predetermined pressure limit value 40 FIG. 5
  • the operating pressure of the writing fluid in the second conduit was about 250 mbar, the predetermined pressure limit being about 180 mbar.

Abstract

The invention relates to a marking device, comprising a pump (2), a marking liquid container (6) for holding a marking liquid (8) and a marking head (12). A first line (4) through which the pressurised air of the pump (2) can be pumped into the marking liquid container (6) is located between the pump (2) and said marking liquid container (6). A second line (10), through which the marking liquid (8) can be pumped from the marking liquid container (6) to the marking head (12) is also provided. A surveillance device (22, 24) for measuring the pressure and for comparing the pressure measurement with a predetermined limit pressure value is provided in said second line (10). Were a hole or similar to appear in the second line (10), the falling of the pressure measurement below the limit pressure value would be detected by the surveillance device (22, 24) and the marking liquid container (6) would be deaerated. The deaeration of the marking liquid container (6) causes to the pressure inside said marking liquid container (6) to decrease. This ensures that no more marking liquid (8), which would otherwise leak out through the hole, is pumped into the second line (10). The invention also relates to an extrusion system with a marking device of this type.

Description

Die Erfindung betrifft eine Beschriftungsvorrichtung mit einer Pumpe, einem Schreibflüssigkeitsbehälter zur Aufnahme einer Schreibflüssigkeit und einem Schreibkopf, wobei eine erste Leitung und eine zweite Leitung vorgesehen ist, durch die Druckluft von der Pumpe in den Schreibflüssigkeitsbehälter bzw. die Schreibflüssigkeit zu dem Schreibkopf führbar ist. Weiterhin betrifft die Erfindung eine Extrusionsanlage mit einer solchen Beschriftungsvorrichtung.The invention relates to a labeling device with a pump, a writing fluid container for receiving a writing fluid and a write head, wherein a first line and a second line is provided, can be guided by the compressed air from the pump in the writing fluid container and the writing fluid to the write head. Furthermore, the invention relates to an extrusion system with such a labeling device.

Aus dem Dokument DE 41 12 033 C2 ist eine Einrichtung zum Schreiben und Zeichnen, insbesondere für einen Plotter bekannt. Die beschriebene Einrichtung weist eine Pumpe, eine Kammer, die von einem beweglichen Kolben in zwei Abschnitte unterteilt ist, und einen Schreibkopf auf. Die Pumpe treibt Druckluft über eine erste Leitung in den ersten Abschnitt der Kammer, so dass Druck auf den Kolben ausgeübt wird. In dem zweiten Abschnitt der Kammer ist die Tinte untergebracht, die aufgrund des durch den Kolben übertragenen Druckes durch eine zweite Leitung zu dem Schreibkopf getrieben wird. In der ersten Leitung ist ein Durcksensor angeordnet, der den Druck innerhalb der ersten Leitung mißt. Ist die Tinte vollständig aus dem zweiten Abschnitt der Kammer gedrückt, so ist der Kolben in eine Position gelangt, in der die Luft aus dem ersten Abschnitt, an dem Kolben vorbei, durch den zweiten Abschnitt, die zweite Leitung und den Schreibkopf nach außen gelangt, so dass ein Druckabfall in der ersten Leitung hervorgerufen wird. Dieser Druckabfall wird mittels eines Drucksensors in der ersten Leitung erfasst, um ein Signal auszugeben, das auf den erschöpften Tintenvorrat hinweist.The document DE 41 12 033 C2 discloses a device for writing and drawing, in particular for a plotter. The described device comprises a pump, a chamber, which is divided into two sections by a movable piston, and a write head. The pump drives compressed air via a first line into the first section of the chamber, so that pressure is exerted on the piston. In the second portion of the chamber, the ink is accommodated, which is driven due to the pressure transmitted by the piston through a second line to the write head. In the first line, a pressure sensor is arranged, which measures the pressure within the first line. When the ink is completely pushed out of the second section of the chamber, the piston has reached a position in which the air passes out of the first section, past the piston, through the second section, the second line and the write head, so that a pressure drop in the first line is caused. This pressure drop is detected by a pressure sensor in the first line to output a signal indicative of the depleted ink supply.

Die bekannte Einrichtung zum Schreiben und Zeichnen hat den Nachteil, dass bei einer Beschädigung der zweiten Leitung, wie z. B. einem Platzen derselben, die Tinte ungehindert ausfließen kann. Dies führt einerseits zu einer Verschmutzung des zu beschriftenden Produktes und andererseits zu einer erhöhten Brandgefahr, wenn eine brennbare Tinte benutzt wird.The known device for writing and drawing has the disadvantage that in case of damage to the second line, such. B. a burst of the same, the ink can flow freely. This leads on the one hand to contamination of the product to be labeled and on the other hand to an increased risk of fire when a combustible ink is used.

Aus dem Dokument DE 24 28 115 A1 ist eine Beschriftungseinrichtung bekannt, die eine Überwachungseinrichtung zur Messung des Drucks in einem Zuführröhrchen aufweist. Hier sollen Zuführmenge und Zuführdruck geregelt werden.From the document DE 24 28 115 A1 a labeling device is known, which has a monitoring device for measuring the pressure in a supply tube. Here the feed rate and feed pressure should be regulated.

Aus dem Dokument EP 933217-A2 ist eine Beschriftungseinrichtung bekannt, die eine Überwachungseinrichtung zur Messung des Drucks und der Temperatur eines Druckkopfes aufweist.Document EP 933217-A2 discloses a labeling device which has a monitoring device for measuring the pressure and the temperature of a print head.

Der Erfindung liegt somit die Aufgabe zugrunde, eine Beschriftungsvorrichtung zu schaffen, die ein durch eine Leckage o. ä. hervorgerufenes Auslaufen der Schreibflüssigkeit verhindert. Ferner liegt der Erfindung die Aufgabe zugrunde, eine Extrusionsanlage mit einer solchen Beschriftungsvorrichtung zu schaffen.The invention is therefore an object of the invention to provide a labeling device that prevents leakage caused by leakage o. Ä. Leakage of the writing fluid. Furthermore, the invention has for its object to provide an extrusion line with such a labeling device.

Die Lösung dieser Aufgabe erfolgt an Hand der in Patentanspruch 1 bzw. 9 angegebenen Merkmale.The solution of this problem is based on the features specified in claim 1 and 9 features.

Die Erfindung schafft eine Beschriftungsvorrichtung mit einer Pumpe, einem Schreibflüssigkeitsbehälter zur Aufnahme einer Schreibflüssigkeit und einem Schreibkopf. Zwischen der Pumpe und dem Schreibflüssigkeitsbehälter ist eine erste Leitung angeordnet, durch die die Druckluft der Pumpe in den Schreibflüssigkeitsbehälter gedrückt werden kann. Darüber hinaus ist eine zweite Leitung vorgesehen, durch die die Schreibflüssigkeit aus dem Schreibflüssigkeitsbehälter zu dem Schreibkopf gedrückt werden kann. In der zweiten Leitung ist eine Überwachungseinrichtung zur Messung des Drucks und zum Vergleich des gemessenen Drucks mit einem vorgegebenen Druckgrenzwert vorgesehen.The invention provides a marking device with a pump, a writing fluid container for receiving a writing fluid and a writing head. Between the pump and the writing fluid container, a first line is arranged, through which the compressed air of the pump can be pressed into the writing fluid container. In addition, a second line is provided, through which the writing fluid can be pressed from the writing fluid reservoir to the recording head. In the second line, a monitoring device for measuring the pressure and for comparing the measured pressure with a predetermined pressure limit is provided.

Der Druck innerhalb der zweiten Leitung ist im Betrieb der Beschriftungsvorrichtung und bei intakter zweiter Leitung stets oberhalb des vorgegebenen Druckgrenzwertes. Sollte in der zweiten Leitung ein Loch, ein Riß o. ä. auftreten, so würde das Unterschreiten des Druckgrenzwertes durch den von der Überwachungseinrichtung durchgeführten Vergleich festgestellt, woraufhin der Schreibflüssigkeitsbehälter entlüftet wird.The pressure within the second line is always above the predetermined pressure limit value during operation of the labeling device and with an intact second line. Should a hole, a crack or the like appear in the second line, the undershooting of the pressure limit value would be determined by the comparison carried out by the monitoring device, whereupon the writing fluid container is vented.

Durch die Überwachung des Drucks in der zweiten Leitung wird somit ein Riß oder Loch in bzw. ein Platzen der zweiten Leitung ermittelt. Durch die nachfolgende Entlüftung des Schreibflüssigkeitsbehälters, wird der Druck innerhalb des Schreibflüssigkeitsbehälters abgebaut, so dass keine Schreibflüssigkeit mehr in die zweite Leitung gedrückt wird, die ansonsten durch das Loch o. ä. austreten würde.By monitoring the pressure in the second line thus a crack or hole in or a burst of the second line is determined. Due to the subsequent venting of the writing fluid container, the pressure within the writing fluid container is reduced, so that no writing fluid is pressed into the second line, which would otherwise escape through the hole or the like.

In einer bevorzugten Ausführungsform der erfindungsgemäßen Beschriftungsvorrichtung ist in der ersten Leitung ein Absperrorgan vorgesehen, das von einer Durchflußstellung in eine Absperrstellung überführbar ist, in der die Pumpe gesperrt ist und der Behälter entlüftet wird. Ein derartiges Absperrorgan kann beispielsweise von einem Ventil gebildet sein, das innerhalb der ersten Leitung angeordnet ist und diese in Teilleitungen unterteilt. In der Durchflußstellung würde ein solches Ventil die Teilleitungen miteinander verbinden, während in der Absperrstellung die zu der Pumpe führende Teilleitung gesperrt und die zu dem Schreibflüssigkeitsbehälter führende Teilleitung entlüftet würde.In a preferred embodiment of the labeling device according to the invention, a shut-off device is provided in the first line, which can be transferred from a flow position into a shut-off position in which the pump is locked and the container is vented. Such a shut-off device may for example be formed by a valve which is arranged within the first line and subdivided into sub-lines. In the flow position, such a valve would connect the sub-lines, while in the shut-off position the leading to the pump part line would be blocked and the leading to the writing fluid reservoir part line would be vented.

Um eine besonders einfache Überwachung des Drucks innerhalb der zweiten Leitung zu ermöglichen, umfaßt die Überwachungseinrichtung in einer bevorzugten Ausführungsform eine von der zweiten Leitung abzweigende dritte Leitung mit einem daran anschließenden Druckschalter. Der Druckschalter ist mit dem Absperrorgan über eine erste Steuerleitung verbunden, über die Steuersignale für das Absperrorgan geleitet werden können. Unter einem Druckschalter ist ein mechanischer Schalter zu verstehen, der bei einem Druck oberhalb des vorgegebenen Druckgrenzwertes in einer ersten Position steht und bei einem Absinken des Druckes unter den vorgegebenen Druckgrenzwert in eine zweite Position übergeht, wobei der Schaltpunkt variabel sein kann. Dies stellt eine besonders einfache Meß- und Vergleichsmethode dar.In order to allow a particularly simple monitoring of the pressure within the second line, the monitoring device comprises in a preferred embodiment a branching off from the second line third line with an adjoining pressure switch. The pressure switch is connected to the obturator via a first control line, can be passed via the control signals for the obturator. Under a pressure switch is a mechanical one To understand switch that is at a pressure above the predetermined pressure limit in a first position and merges with a decrease in pressure below the predetermined pressure limit in a second position, wherein the switching point may be variable. This represents a particularly simple measurement and comparison method.

In einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Beschriftungsvorrichtung ist die zweite Leitung derart oberhalb des Schreibflüssigkeitsbehälters angeordnet, dass die Schreibflüssigkeit in den entlüfteten Schreibflüssigkeitsbehälter zurückfließt. Auf diese Weise ist gewährleistet, dass auch die in der zweiten Leitung vorhandene Schreibflüssigkeit nach dem Entstehen des Lochs o. ä. nicht innerhalb der zweiten Leitung verbleibt und somit ausläuft, sondern aufgrund des Eigengewichtes wieder in den Schreibflüssigkeitsbehälter zurückfließt. Voraussetzung hierfür ist allerdings, dass die Kapillarwirkung innerhalb der zweiten Leitung gering ist.In a further advantageous embodiment of the labeling device according to the invention, the second line is arranged above the writing fluid container such that the writing fluid flows back into the vented writing fluid container. In this way, it is ensured that the writing liquid present in the second line does not remain within the second line after the emergence of the hole and thus runs out, but instead flows back into the writing fluid container due to its own weight. The prerequisite for this, however, is that the capillary action within the second line is low.

Vorteilhafterweise ist in der ersten Leitung eine Druckminderungseinrichtung vorgesehen, so dass Druckschwankungen weitgehend verhindert werden können.Advantageously, a pressure reduction device is provided in the first line, so that pressure fluctuations can be largely prevented.

Um ein Verstopfen des Schreibkopfes bzw. dessen Düsen zu verhindern ist in einer vorteilhaften Ausführungsform der Erfindung in der zweiten Leitung mindestens ein Filter vorgesehen, der die in der Schreibflüssigkeit vorhandenen Verunreinigungen und Partikel herausfiltert.In order to prevent clogging of the write head or its nozzles, in an advantageous embodiment of the invention, at least one filter is provided in the second line, which filters out the impurities and particles present in the writing fluid.

In einer besonders vorteilhaften Ausführungsform der erfindungsgemäßen Beschriftungsvorrichtung weist der Schreibkopf mindestens eine Düse auf, die über eine Steuereinheit angesteuert wird. Dies bedeutet, dass die Düse mittels der Steuereinheit geöffnet oder geschlossen wird. Die Steuereinheit ist mit der Überwachungseinrichtung über eine zweite Steuerleitung verbunden, über die Steuersignale für die Überwachungseinrichtung geleitet werden können. Wenn alle Düsen des Schreibkopfes geschlossen sind, sendet die Steuereinheit über die zweite Steuerleitung ein entsprechendes Signal an die Überwachungseinrichtung, die wiederum einen höheren vorgegebenen Druckgrenzwert festlegt. Diese Ausführungsform ist insofern von Vorteil, da auch das Öffnen der Düsen einen bestimmten Druckabfall innerhalb der zweiten Leitung bewirkt. Da dieser Druckabfall nicht als Beschädigung der Leitung gewertet werden soll, ist der vorgegebene Druckgrenzwert entsprechend klein gewählt. Würde nun ein Loch der Größe einer Düsenöffnung innerhalb der zweiten Leitung vorliegen während alle Düsen geschlossen sind, so würde dies nicht registriert, da der vorgegebene Druckgrenzwert zu klein wäre und somit nicht unterschritten würde. Die Steuereinheit ermöglicht eine entsprechende Anpassung des vorgegebenen Druckgrenzwertes, so dass auch kleinste Beschädigungen der zweiten Leitung erfasst werden können.In a particularly advantageous embodiment of the labeling device according to the invention, the write head has at least one nozzle, which is controlled via a control unit. This means that the nozzle is opened or closed by means of the control unit. The control unit is connected to the monitoring device via a second control line, via which control signals for the monitoring device can be passed. If all the nozzles of the Write head are closed, sends the control unit via the second control line a corresponding signal to the monitoring device, which in turn sets a higher predetermined pressure limit. This embodiment is advantageous in that the opening of the nozzles causes a certain pressure drop within the second conduit. Since this pressure drop should not be evaluated as damage to the line, the predetermined pressure limit is chosen to be correspondingly small. If now a hole of the size of a nozzle opening are present within the second line while all nozzles are closed, this would not be registered because the predetermined pressure limit value would be too small and thus would not fall below. The control unit allows a corresponding adjustment of the predetermined pressure limit, so that even the smallest damage of the second line can be detected.

Um die gesamte Länge der zweiten Leitung wirkungsvoll zu überwachen, ist die Überwachungseinrichtung in einer bevorzugten Ausführungsform der Beschriftungsvorrichtung derart angeordnet, dass die Messung des Druckes innerhalb der zweiten Leitung unmittelbar vor dem Schreibkopf erfolgt.In order to effectively monitor the entire length of the second line, the monitoring device is arranged in a preferred embodiment of the labeling device such that the measurement of the pressure within the second line takes place immediately before the write head.

Die erfindungsgemäße Extrusionsanlage weist eine Beschriftungsvorrichtung der vorbeschriebenen Art auf, wobei die Beschriftungsvorrichtung der Beschriftung des extrudierten Werkstoffes dient. Insbesondere bei Extrusionsanlagen ist eine sichere bzw. dichte Beschriftungsvorrichtung notwendig, da vielfach mit leicht entzündlicher Schreibflüssigkeit gearbeitet wird. Ein Auslaufen der Schreibflüssigkeit würde den extrudierten Werkstoff verschmutzen, schwerwiegender ist allerdings, dass es beim Aufziehen von Schutzfolien auf den extrudierten Werkstoff zur Entladung statischer Aufladungen kommen kann, die letztlich die Entzündung der brennbaren Schreibflüssigkeit bewirken. Somit stellt eine Beschriftungsvorrichtung für die Bedienungsperson, den extrudierten Werkstoff und die Extrusionsanlage eine erhebliche Gefahrenquelle dar. Mit Hilfe der vorbeschriebenen Beschriftungsvorrichtung ist diese Gefahr beseitigt.The extrusion system according to the invention has a labeling device of the type described above, wherein the labeling device of the lettering of the extruded material is used. In particular, in extrusion systems, a secure or dense labeling device is necessary because it is often worked with highly flammable writing fluid. Leaking the writing fluid would contaminate the extruded material, more serious, however, that it may come when mounting protective films on the extruded material to discharge static charges, which ultimately cause the ignition of the combustible writing fluid. Thus, a labeling device for the operator, the extruded material and the extrusion line a considerable Hazardous source. With the help of the above-described labeling device this risk is eliminated.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren eingehender erläutert.In the following the invention will be explained in more detail by means of embodiments with reference to the accompanying figures.

Es zeigen:

Fig. 1
eine schematische Darstellung der erfindungsgemäßen Beschriftungsvorrichtung,
Fig. 2
die Beschriftungsvorrichtung von Fig. 1 mit platzender zweiter Leitung,
Fig. 3
die Beschriftungsvorrichtung von Fig. 1 nach dem Platzen der zweiten Leitung,
Fig. 4
ein Zeit-Druck-Diagramm für die Beschriftungsvorrichtung nach den Fig. 1 bis 3 und
Fig. 5
ein Zeit-Druck-Diagramm für die Beschriftungsvorrichtung nach Fig. 1 in einer abgewandelten Ausführungsform.
Show it:
Fig. 1
a schematic representation of the labeling device according to the invention,
Fig. 2
the labeling device of FIG. 1 with a bursting second line,
Fig. 3
the labeling device of Fig. 1 after the bursting of the second line,
Fig. 4
a time-pressure diagram for the labeling device according to FIGS. 1 to 3 and
Fig. 5
a time-pressure diagram for the labeling device of FIG. 1 in a modified embodiment.

Fig. 1 zeigt eine schematische Darstellung der erfindungsgemäßen Beschriftungsvorrichtung. Die erfindungsgemäße Beschriftungsvorrichtung weist eine Pumpe 2 auf, die über eine erste Leitung 4 mit einem Schreibflüssigkeitsbehälter 6 verbunden ist. Die erste Leitung 4 ragt dabei in einen oberen Bereich des Schreibflüssigkeitsbehälter 6, der mit einer Schreibflüssigkeit 8 gefüllt ist. Die Schreibflüssigkeit 8 kann eine Tinte sein, wie z. B. Wasserbasis-, Ethanol-, Isopropanol-, Ethyl-Acetat-, MEK-, Hochtemperatur- oder Sondertinte. Aus dem Schreibflüssigkeitsbehälter 6 erstreckt ausgehend von dem unteren Bereich desselben eine zweite Leitung 10 zu einem Schreibkopf 12. Der Schreibkopf 12 weist mehrere Düsen 14 auf, die mittels einer Steuereinheit 16 geöffnet bzw. geschlossen werden können. In der zweiten Leitung 10 ist ferner ein Filter 18 zur Filterung der Schreibflüssigkeit 8 angeordnet, während in der ersten Leitung 4 eine Druckminderungseinrichtung 20 in Form eines Ventiles angeordnet ist.Fig. 1 shows a schematic representation of the labeling device according to the invention. The labeling device according to the invention has a pump 2, which is connected via a first line 4 with a writing fluid container 6. The first line 4 protrudes into an upper region of the writing fluid container 6, which is filled with a writing fluid 8. The writing fluid 8 may be an ink, such as. Water-based, ethanol, isopropanol, ethyl acetate, MEK, high temperature or specialty ink. From the writing fluid reservoir 6 extends from the lower portion of the same a second line 10 to a write head 12. The write head 12 has a plurality of nozzles 14 which can be opened or closed by means of a control unit 16. In the second line 10, a filter 18 for filtering the writing liquid 8 is further arranged, while in the first line 4, a pressure reducing device 20 is arranged in the form of a valve.

Von der zweiten Leitung 10 zweigt unmittelbar vor dem Schreibkopf 12 eine dritte Leitung 22 ab, die sich zu einem Druckschalter 24 erstreckt. Der Druckschalter 24 ist in der dargestellten Ausführungsform ein mechanischer Schalter, der bei einem Druck oberhalb eines vorgegebenen Druckgrenzwertes in einer ersten Position steht und bei einem Absinken des Druckes unter den vorgegebenen Druckgrenzwert in eine zweite Position übergeht. Der Druckschalter 24 ist über eine erste Steuerleitung 26 mit einem Absperrorgan 28 verbunden, außerdem ist der Druckschalter 24 über eine weitere Steuerleitung 30 mit der Pumpe 2 verbunden, wobei die Steuerleitung 30 fakultativ ist. Das Absperrorgan 28 ist innerhalb der ersten Leitung 4 angeordnet und kann von einer Durchflußstellung (Fig. 1 und 2) in eine Absperrstellung (Fig. 3) überführt werden, in der die Pumpe 2 gesperrt ist und der Schreibflüssigkeitsbehälter 6 entlüftet wird.From the second line 10 branches off immediately before the write head 12 from a third line 22, which extends to a pressure switch 24. The pressure switch 24 is in the illustrated embodiment mechanical switch, which is at a pressure above a predetermined pressure limit in a first position and merges with a decrease in pressure below the predetermined pressure limit in a second position. The pressure switch 24 is connected via a first control line 26 with a shut-off device 28, also the pressure switch 24 is connected via a further control line 30 to the pump 2, wherein the control line 30 is optional. The obturator 28 is disposed within the first conduit 4 and can be transferred from a flow position (Figures 1 and 2) to a shut-off position (Figure 3) in which the pump 2 is shut off and the writing fluid reservoir 6 is vented.

Unter Bezugnahme auf die Fig. 1 bis 4 wird im folgenden die Funktionsweise der erfindungsgemäßen Beschriftungsvorrichtung erläutert.With reference to FIGS. 1 to 4, the operation of the labeling device according to the invention will be explained below.

Fig. 1 zeigt die Beschriftungsvorrichtung bei normalem ungestörten Betrieb. Die Pumpe 2 drückt Luft durch die erste Leitung 4, über die Druckminderungseinrichtung 20 und das Absperrorgan 28, das sich in der Durchflußstellung befindet, in den Schreibflüssigkeitsbehälter 6. Im oberen Bereich des Schreibflüssigkeitsbehälters 6 bildet sich eine Luftblase aus, die aufgrund des durch die Pumpe 2 erzeugten Druckes auf die darunterliegende Schreibflüssigkeit 8 drückt. Durch diesen Druck wird die Schreibflüssigkeit 8 in die zweite Leitung 10 bis zum Schreibkopf 12 und in die dritte Leitung 22 des Druckschalters 24 getrieben, wobei eine Filterung der Schreibflüssigkeit 8 durch den Filter 18 erfolgt. Der Druck innerhalb der zweiten bzw. dritten Leitung 10,22 liegt bei ungestörtem Betrieb der Beschriftungsvorrichtung oberhalb eines vorgegebenen Druckgrenzwertes 32 (Fig. 4). Zum Beschriften des (nicht dargestellten) Werkstückes, werden nun die Düsen 14 durch die Steuereinheit 16 in Abhängigkeit davon geöffnet oder geschlossen, welches Zeichen auf das Werkstück geschrieben werden soll. Fig. 4 zeigt im Abschnitt a des dargestellten Diagramms den Verlauf 34 des Drucks p in der zweiten bzw. dritten Leitung 10,22 über der Zeit t für Fig. 1. Je mehr Düsen 14 geöffnet sind, um so stärker fällt der Druck p ab, sinkt jedoch - selbst wenn alle Düsen 14 geöffnet sind - nicht unter den vorgegebenen Druckgrenzwert 32.Fig. 1 shows the labeling device in normal undisturbed operation. The pump 2 pushes air through the first line 4, via the pressure reducing device 20 and the obturator 28, which is located in the flow position, in the writing fluid tank 6. In the upper part of the writing fluid container 6 forms an air bubble, due to the pump 2 generated pressure on the underlying writing fluid 8 presses. By this pressure, the writing liquid 8 is driven into the second line 10 to the write head 12 and into the third line 22 of the pressure switch 24, wherein a filtering of the writing liquid 8 through the filter 18 takes place. The pressure within the second or third line 10, 22 is above a predetermined pressure limit value 32 (FIG. 4) during undisturbed operation of the labeling device. To label the workpiece (not shown), the nozzles 14 are now opened or closed by the control unit 16 in response to which character is to be written on the workpiece. FIG. 4 shows in section a of the illustrated diagram the profile 34 of the pressure p in the second and third, respectively Line 10,22 over the time t for Fig. 1. The more nozzles 14 are opened, the more the pressure drops from p, but drops - even if all the nozzles 14 are open - not below the predetermined pressure limit 32nd

Fig. 2 zeigt die Beschriftungsvorrichtung bei einem Platzen der zweiten Leitung 10 an einer Stelle A zum Zeitpunkt t1. Durch das Austreten der Schreibflüssigkeit 8 an der Stelle A sinkt der Druck p innerhalb der zweiten bzw. dritten Leitung 10,22 ab, wie dies im Abschnitt b des in Fig. 4 dargestellten Diagramms dargestellt ist.FIG. 2 shows the labeling device when the second line 10 bursts at a point A at the time t 1 . As a result of the leakage of writing fluid 8 at point A, the pressure p within the second or third line 10, 22 decreases, as shown in section b of the diagram shown in FIG.

Sobald der Druck p innerhalb der zweiten bzw. dritten Leitung 10,22 unter den Druckgrenzwert 32 sinkt (t2) geht der Druckschalter 24 von der ersten Position in die oben beschriebene zweite Position über, woraufhin ein entsprechendes Signal über die erste Steuerleitung 26 an das Absperrorgan 28 übermittelt wird. Das Absperrorgan 28 wird durch das Signal von der Durchflußstellung in die Absperrstellung überführt (Fig. 3). In der Absperrstellung wird der Teil der ersten Leitung 4, der sich von der Pumpe 2 bis zu dem Absperrorgan 28 erstreckt, verschlossen, wohingegen der Teil der ersten Leitung 4, der sich zwischen dem Absperrorgan 28 und dem Schreibflüssigkeitsbehälter 6 erstreckt, entlüftet wird, so dass die Luft aus dem Schreibflüssigkeitsbehälter 6 durch die erste Leitung 4 und das Absperrorgan 28 in Richtung des Pfeiles 36 entweichen kann. Durch die Entlüftung des Schreibflüssigkeitsbehälters 6 und die höhere Anordnung der zweiten Leitung 10 oberhalb des Schreibflüssigkeitsbehälters 6, kann die Schreibflüssigkeit 8 aus der zweiten Leitung 10 wieder in den Schreibflüssigkeitsbehälter 6 zurückfließen. Ein weiteres Auslaufen der Schreibflüssigkeit 8 an der Stelle A wird somit verhindert. Gleichzeitig mit dem Signal über die Signalleitung 26 kann auch ein Signal über die Signalleitung 30 gesandt werden, so dass die Pumpe 2 die Förderung einstellt. Dies ist allerdings nicht unbedingt erforderlich, da die Zufuhr von weiterer Druckluft ohnehin durch das Absperrorgan 28 in der Absperrstellung unterbunden wird.As soon as the pressure p within the second or third line 10, 22 falls below the pressure limit value 32 (t 2 ), the pressure switch 24 changes from the first position to the second position described above, whereupon a corresponding signal is sent to the first control line 26 via the first control line 26 Shut-off 28 is transmitted. The obturator 28 is transferred by the signal from the flow position into the shut-off position (FIG. 3). In the shut-off position, the portion of the first conduit 4 extending from the pump 2 to the obturator 28 is closed, whereas the portion of the first conduit 4 extending between the obturator 28 and the reservoir fluid reservoir 6 is vented the air can escape from the writing fluid container 6 through the first conduit 4 and the obturator 28 in the direction of the arrow 36. Due to the venting of the writing fluid container 6 and the higher arrangement of the second line 10 above the writing fluid container 6, the writing fluid 8 from the second conduit 10 can flow back into the writing fluid container 6 again. Further leakage of the writing fluid 8 at the point A is thus prevented. Simultaneously with the signal via the signal line 26, a signal can be sent via the signal line 30, so that the pump 2 stops the promotion. However, this is not absolutely necessary since the supply of additional compressed air is prevented anyway by the obturator 28 in the shut-off position.

In Fig. 4 ist weiterhin der Fall dargestellt, dass lediglich ein Loch in der zweiten Leitung 10 auftritt, das nicht zu einem vollständigen Druckverlust führt (strichpunktierte Darstellung). Auch in diesem Fall reagiert die erfindungsgemäße Beschriftungsvorrichtung in der vorbeschriebenen Weise.FIG. 4 also shows the case that only one hole in the second line 10 occurs which does not lead to a complete pressure loss (dot-dashed representation). Also in this case, the labeling device according to the invention reacts in the manner described above.

Abschließend sei eine vorteilhafte Abwandlung der vorbeschriebenen Beschriftungsvorrichtung beschrieben. Bei dieser Ausführungsform ist zwischen der Steuereinheit 16 und dem Druckschalter 24 eine zweite Steuerleitung 38 vorgesehen. Wenn alle Düsen 14 des Schreibkopfes 12 von der Steuereinheit 16 geschlossen sind, so kann über die zweite Steuerleitung 38 ein entsprechendes Signal an den Druckschalter 24 ergehen, wodurch der vorgegebene Druckgrenzwert 40 (Fig. 5) erhöht wird. Selbst in den Abschnitten c, in denen alle Düsen 14 geschlossen sind und der Druckgrenzwert 40 somit erhöht ist, können nun Druckabfälle registriert werden, die durch kleinste Löcher in der zweiten Leitung 10 und nicht von offenen Düsen 14 hervorgerufen werden. Bevor die Öffnung einzelner Düsen 14 wieder erfolgt, ergeht ein erneutes Signal über die Signalleitung 38, so dass der vorgegebene Druckgrenzwert 40 wieder auf den ursprünglichen Wert gesenkt ist.Finally, an advantageous modification of the above-described labeling device will be described. In this embodiment, a second control line 38 is provided between the control unit 16 and the pressure switch 24. When all the nozzles 14 of the write head 12 are closed by the control unit 16, a corresponding signal can be sent to the pressure switch 24 via the second control line 38, whereby the predetermined pressure limit value 40 (FIG. 5) is increased. Even in the sections c where all the nozzles 14 are closed and the pressure limit value 40 is thus increased, pressure drops caused by the smallest holes in the second line 10 and not by open nozzles 14 can now be registered. Before the opening of individual nozzles 14 takes place again, a new signal is sent via the signal line 38, so that the predetermined pressure limit value 40 is lowered again to the original value.

In einem seitens der Anmelderin durchgeführten Experiments betrug der Betriebsdruck der Schreibflüssigkeit in der zweiten Leitung ca. 250 mbar, wobei der vorgegebene Druckgrenzwert ungefähr bei 180 mbar lag.In an experiment conducted by the applicant, the operating pressure of the writing fluid in the second conduit was about 250 mbar, the predetermined pressure limit being about 180 mbar.

Claims (9)

  1. Inscription device having a pump (2), a writing fluid container (6) for receiving a writing fluid, and a writing head (12), in which are provided a first line (4), via which compressed air is directable into the writing fluid container (6) by the pump (2), and a second line (10), via which the writing fluid is directable to the writing head (12),
    characterised in that the inscription device comprises a monitoring instrument (22, 24) for measuring the pressure in the second line (10) and for comparing the measured pressure value with a preset pressure limit value (32, 40), which monitoring device is designed in such a way that a pressure drop attributable to a leakage in the second line (10) is detectable, the writing fluid container (6) being vented if the preset pressure limit value (32, 40) is not attained.
  2. Inscription device according to Claim 1, characterised in that a shut-off member (28) is provided in the first line (4), which shut-off member is convertible from a through-flow position into a shut-off position in which the pump (2) is locked and the writing fluid container (6) is vented.
  3. Inscription device according to Claim 2, characterised in that the monitoring instrument (22, 24) comprises a third line (22) branching off from the second line (10) with an adjoining pressure switch (24) which is connected to the shut-off member (28) via a first control line (26) via which control signals for the shut-off member (28) are conductible.
  4. Inscription device according to any one of the preceding claims, characterised in that the second line (10) is arranged above the writing fluid container (6) in such a way that the writing fluid flows back into the vented writing fluid container (6).
  5. Inscription device according to any one of the preceding claims, characterised in that a pressure-lowering instrument (20) is provided in the first line (4).
  6. Inscription device according to any one of the preceding claims, characterised in that at least one filter (18) is provided in the second line (10).
  7. Inscription device according to any one of the preceding claims, characterised in that the writing head (12) has at least one nozzle (14) controllable via a control unit (16), the control unit (16) being connected to the monitoring instrument (22, 24) via a second control line (38) via which control signals for the monitoring instrument (22, 24) are conductible, by means of which signals the preset pressure limit value (32, 40) is adjustable according to whether the nozzles (14) are open or closed.
  8. Inscription device according to any one of the preceding claims, characterised in that the monitoring instrument (22, 24) is arranged in such a way that measuring of the pressure within the second line (10) is performed immediately upstream of the writing head (12).
  9. Extrusion installation having an inscription device according to any one of the preceding claims for inscribing an extruded workpiece.
EP01980507A 2000-11-15 2001-10-23 Marking device and extrusion system with a marking device of this type Expired - Lifetime EP1333983B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10056602A DE10056602C1 (en) 2000-11-15 2000-11-15 Writing device, for extrusion plant, monitors pressure in line between writing fluid container and writing head for detecting leak
DE10056602 2000-11-15
PCT/EP2001/012200 WO2002040274A1 (en) 2000-11-15 2001-10-23 Marking device and extrusion system with a marking device of this type

Publications (2)

Publication Number Publication Date
EP1333983A1 EP1333983A1 (en) 2003-08-13
EP1333983B1 true EP1333983B1 (en) 2006-01-11

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EP01980507A Expired - Lifetime EP1333983B1 (en) 2000-11-15 2001-10-23 Marking device and extrusion system with a marking device of this type

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EP (1) EP1333983B1 (en)
AT (1) ATE315479T1 (en)
AU (1) AU2002212336A1 (en)
DE (2) DE10056602C1 (en)
WO (1) WO2002040274A1 (en)

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CN102343720A (en) * 2010-08-06 2012-02-08 北京美科艺数码科技发展有限公司 Automatic detection method of ink-jet-printer negative pressure system
CN104538115B (en) * 2014-12-09 2016-09-07 广州北峻工业材料有限公司 Band circuit nesa coating and preparation method thereof
WO2016139170A1 (en) 2015-03-02 2016-09-09 Jt International Sa Packaging with magnetic closing mechanism

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2428115B2 (en) 1974-06-11 1976-04-22 Hebel Gasbetonwerk Gmbh, 8080 Emmering DEVICE FOR CUTTING A STILL PLASTIC PORE CONCRETE BLOCK
DE2429115C3 (en) * 1974-06-18 1978-11-23 Rotring-Werke Riepe Kg, 2000 Hamburg Drawing method as well as regulating and control device for the writing fluid supply to a drawing device
US5101219A (en) * 1990-04-12 1992-03-31 Gerber Garment Technology, Inc. Long life pen and ink supply unit for x,y plotter and the like and related method of use
US5489925A (en) * 1993-05-04 1996-02-06 Markem Corporation Ink jet printing system
JPH09193414A (en) * 1996-01-16 1997-07-29 Canon Inc Liquid holding and supplying apparatus and method therefor
US6164743A (en) * 1996-04-17 2000-12-26 Hewlett-Packard Company Ink container with an inductive ink level sense
US6036296A (en) * 1996-10-31 2000-03-14 Hewlett-Packard Company Fluid level detection apparatus and method for determining the volume of fluid in a container

Also Published As

Publication number Publication date
EP1333983A1 (en) 2003-08-13
ATE315479T1 (en) 2006-02-15
WO2002040274A1 (en) 2002-05-23
DE50108698D1 (en) 2006-04-06
AU2002212336A1 (en) 2002-05-27
DE10056602C1 (en) 2002-04-04

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