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EP1333994B1 - Dispositif de dosage et instrument d'ecriture pourvu d'un tel dispositif - Google Patents

Dispositif de dosage et instrument d'ecriture pourvu d'un tel dispositif Download PDF

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Publication number
EP1333994B1
EP1333994B1 EP01982455A EP01982455A EP1333994B1 EP 1333994 B1 EP1333994 B1 EP 1333994B1 EP 01982455 A EP01982455 A EP 01982455A EP 01982455 A EP01982455 A EP 01982455A EP 1333994 B1 EP1333994 B1 EP 1333994B1
Authority
EP
European Patent Office
Prior art keywords
secondary container
dosing device
container
liquid
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01982455A
Other languages
German (de)
English (en)
Other versions
EP1333994A1 (fr
Inventor
Tilo Strobelt
Günther WAIBEL
Michael Sesterhenn
Jörg MELLMANN
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.)
Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG
Original Assignee
Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7662080&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1333994(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG filed Critical Gebrueder Schmidt Fabrik fuer Feinmechanik GmbH and Co KG
Publication of EP1333994A1 publication Critical patent/EP1333994A1/fr
Application granted granted Critical
Publication of EP1333994B1 publication Critical patent/EP1333994B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K5/00—Pens with ink reservoirs in holders, e.g. fountain-pens
    • B43K5/18—Arrangements for feeding the ink to the nibs
    • B43K5/1818—Mechanical feeding means, e.g. valves; Pumps
    • B43K5/189—Pumps

Definitions

  • the present invention relates to a metering device and, in particular, to a metering device for metering a liquid as required and to a writing instrument with such a metering device.
  • the electronic writing instrument comprises a writing tip which extends into a capillary space, which is also referred to as a secondary storage space.
  • the small-volume secondary storage space is fluidly connected to a large-volume primary, pressurized ink storage space through an ink channel, a reload valve being located in the ink channel. If the fluid level in the secondary storage space is too low, the reload valve is actuated to open for a certain time until enough ink has been transported from the primary storage space into the secondary storage space that a sufficient filling level is established there. The level in the secondary storage room is measured using a capacitive sensor.
  • the capacitive sensor is designed as a cylindrical capacitor, the capacitance of which depends on the filling volume of the secondary storage space.
  • a resonance circuit is used which digitally measures the change in capacitance by detuning an oscillating circuit.
  • this circuit comprises an additional capacitance and a quartz oscillator.
  • a counter is used to measure the difference in the oscillation frequencies as an indication of the change in capacity.
  • Demand-based dosing devices form a control system which consists of a storage tank, a buffer reservoir and a pressure control unit.
  • the liquid is dispensed from the buffer reservoir. If the pressure in the buffer reservoir drops below a certain threshold due to the dispensing of liquid, the pressure control unit compensates for the pressure in the buffer reservoir by transferring liquid from the storage tank into the buffer reservoir.
  • Such dosing devices are vacuum-controlled with regard to the ambient pressure, so that both the buffer reservoir and the storage tank must be closed in a pressure-tight manner with respect to the ambient pressure.
  • a volume of gas must be in this vessel. This gas volume is in turn subject to gas laws and expands z. B. on heating, which leads to an increase in pressure in the vessel.
  • the vacuum in the vessel can be reduced, so that the vacuum-controlled delivery of liquid no longer works.
  • a further possible reduction of the negative pressure takes place by reducing the ambient pressure.
  • Such metering devices require a one-sided connection of the storage tank and buffer reservoir to the ambient air for the purpose of gas entry. This connection can lead to leakage of the stored liquid in the event of a malfunction.
  • DE 33 21 301 A1 discloses an ink supply system for writing instruments working with liquid ink, which have a large-volume ink space which is connected via a reload valve to a small-volume ink supply space adjacent to the writing element.
  • the transfer of the ink from the large-volume ink space to the secondary storage space takes place in a sensor-controlled manner as a function of the ink volume present in the secondary ink space.
  • a peristaltic pump is used as the reloading valve, which is driven in rotation by an electric motor and can generate the delivery pressure required to deliver the ink to the secondary ink chamber.
  • the object of the present invention is to provide a safe metering device for metering a liquid as required.
  • Another object of the present invention is to provide a writing device for a liquid writing medium with such a metering device.
  • the present invention is based on the knowledge that it must be started from the concept in which the dispensed liquid reaches the dispensing point directly from the buffer volume. Instead, in the metering device according to the invention, the dispensed liquid is supplied via the main liquid channel, which extends directly from the primary container to the dispensing point.
  • a secondary container is fluidly coupled to the main liquid channel at a branching point, that is to say arranged in the secondary flow.
  • the liquid level in the secondary container is measured by means of a fill level sensor, which in turn feeds a valve control in order to control a valve provided between the primary container and the branch point in the main liquid channel.
  • the secondary container is ventilated and coupled to the main fluid channel such that the main fluid channel preferably fills with the liquid upstream of the secondary container.
  • the metering device according to the invention thus uses the fill level in the secondary flow as a controlled variable, while in the prior art the fill level in the main flow has been used to control the valve. Since the valve in the metering device according to the invention actively prevents the undesired inflow of liquid from the primary container, ventilation of the primary container can also be provided in addition to aeration of the secondary container. The gas pressures in the primary tank and in the secondary tank can therefore always be at ambient pressure.
  • the flow in the main liquid channel is not measured directly in the main flow itself, but rather via the fill level in the secondary container separated from the main flow, which is coupled to the main flow in such a way that the Main stream preferably filled before the secondary stream.
  • this can be achieved by capillary dimensioning of the main liquid channel and of the secondary container. If liquid is withdrawn, the level in the secondary container drops and vice versa. With this change, the consumption of liquid can be measured directly, and the afterflow can be controlled via the valve depending on this.
  • An advantage of the present invention is that both the secondary container and the primary container can be designed independently of the ambient pressure and the ambient temperature. The resulting accidents can no longer occur.
  • Another advantage of the present invention is that by a suitable choice of the surface properties within the secondary container and the adjacent channels, there is the possibility of designing the capillary forces in such a way that the metering device, if it is not intended to dispense any liquid, does not leak automatically, or the secondary volume does not overflow when there is an increase in pressure in the main liquid channel.
  • the secondary container can be ventilated and can be dimensioned so that the capillary pressure in the secondary container decreases as the fill level increases. In preferred exemplary embodiments of the present invention, this can be achieved by enlarging the cross section over the filling path. For such a disproportionate increase in the volume over the filling path in the secondary container, a clear filling or emptying direction can be pronounced in the secondary container, particularly in the case of capillary systems.
  • FIGS. 3a to 3c show a conventional, hydrostatic filler, which is not controlled electronically.
  • the filler comprises a filler housing 70 in which there is a filler cartridge 72 which is attached to a plastic component 74.
  • the ink is finally discharged through a spring 76 to create a stroke 78.
  • a conventional filler can generally be viewed as a complex microdosing system.
  • a property of this system is that all essential fluidic functions are integrated in the only inexpensive plastic component 74.
  • the fluidic system shows weaknesses when so-called accidents occur, for example the change in the ambient temperature and the change in the external air pressure, as they occur e.g. B. can occur inside a starting aircraft.
  • FIG. 3b in which the fluidic concept of the conventional filler is shown.
  • the cartridge 72 which both has a vent 80 and which has an ink duct 82 as an outlet, which is coupled to a plurality of compensation chambers 84, which are usually located under the spring 76 of a fountain pen.
  • the ink cartridge 72 To release ink, the ink cartridge 72 must be ventilated. If an unimpeded air inlet were provided for this purpose, all of the ink present in the ink cartridge would be released via the spring due to the hydrostatic pressure. A regular levy, as required for writing, would then not be possible.
  • the ventilation 80 of the ink cartridge 72 is in the form of a short capillary channel wetted by ink.
  • This channel only opens when a negative pressure is built up in the ink cartridge, which corresponds to the capillary pressure of the ink in the ink conductor 82. At this moment the ink is sucked out of the channel by the negative pressure in the ink cartridge and air can flow in from outside. The process ends when the inflowing air has released the negative pressure in the cartridge. At this moment the ink wets the short capillary channel 80 again and closes it.
  • the portion of the volume of ink not used for writing must be stored in the equalization chambers 84, which form a buffer or a secondary volume.
  • the intermediate storage is typically a capillary storage below the spring 76 in Form of plane-parallel plates, which are referred to as compensation chambers. This memory stores the excess amount of ink and releases it back onto the paper during the further writing process. If the buffer is empty, the ink required for writing is removed from the cartridge 72. This increases the negative pressure, and when the critical value is undershot, the short capillary channel 80 opens again, and the cycle begins again.
  • a disadvantage of this conventional system is the limited tolerance for accidents. Another disadvantage is that the reliable function of the system depends heavily on the coordination of the capillary pressures effective in the ventilation 80 and the secondary volume 84. These, in turn, are a function of the surface properties of the materials used and are therefore heavily dependent on the manufacturing parameters and contamination of the surfaces.
  • the metering device comprises a primary container for storing liquid 12.
  • the primary container 10 thus contains the liquid 12 and a gas volume 14.
  • the primary container is connected to a main liquid channel 16 which extends from an outlet of the primary container via a valve 18 and a branch point 20 to a delivery point 22, which in the case of using the metering device according to the invention is connected to a pen 24 in a fountain pen.
  • a secondary container 26 is connected to the branch point 20 and communicates with the ambient atmosphere via a vent 28.
  • the liquid level in the secondary container 26 is measured by means of a fill level sensor 30, which feeds its measurement signals to a valve control 32, which can open and close the valve 18.
  • valve 18 is controlled by the sensor 30 and the valve control 32.
  • the sensor is located in the secondary container below the nib 24 and monitors the fill level of the secondary container 26.
  • the secondary container is via a fluidic T-piece, which through the branch point 20 is shown schematically in FIG. 1, coupled to the main liquid channel between the valve 18 and the nib 24.
  • the T-piece 20 is designed so that the front part of the spring, ie the tip of the spring with the grain, fills up in front of the secondary container during the first filling.
  • the secondary container is implemented in the form of a capillary gap, the spacing of which increases in a preferred exemplary embodiment (which is discussed in greater detail in FIG. 2c). This ensures that the effective capillary pressure decreases with increasing filling when the volume is filled in a defined manner.
  • ink When writing, ink is dispensed from the main liquid channel via the dispensing point 22 and the pen 24. This ink comes from the secondary tank when it is assumed that the valve is just closed. However, the ink is not dispensed directly from the secondary container, but from the main liquid channel, since the secondary container only via the main liquid channel and not directly communicated with the delivery point. If the ink volume in the secondary container empties below a defined point, the valve 18 is opened again and ink flows into the buffer volume in the secondary container. When the level in the secondary tank has reached an upper limit again, the valve is closed.
  • the valve can be controlled by means of a two-point controller, which monitors the minimum or maximum fill level of the secondary container.
  • the primary container can be ventilated or be under pressure. According to the invention, however, in view of the high load on the valve 18 when the primary container is under pressure, a ventilated primary container is preferred. It should be noted that when the primary reservoir is under pressure, a relatively strong valve is necessary in order to withstand the pressure of the reservoir. This can lead to increased costs of the entire system.
  • FIG. 2a shows an enlarged view of a writing tip 40 which has the writing pen 24 which has a grain 42 at its front tip.
  • the main liquid channel 16 is located below the nib 24 and ends below the nib at the delivery point 22.
  • the junction point 20, which is also referred to as a fluidic T-piece, is also located within the writing tip.
  • the secondary container which in the embodiment shown in FIG. 2a is formed by a secondary liquid channel 26a and a storage area 26b.
  • the fill level sensor 30 Within the storage area of the secondary container 26 is the fill level sensor 30, which measures the fill level in the storage area 26b of the secondary container 26.
  • the secondary container 26 is coupled to the ambient atmosphere via an elongated meandering channel 28a and an opening 28b of the channel.
  • the long meandering ventilation channel 28a provides sure that the evaporation rate of the liquid in the secondary container 26 is minimized.
  • the channel has the smallest possible cross-section and that the opening of the channel, which is designated by reference numeral 28b, is non-wetting towards the surroundings.
  • a capillary negative pressure is generated which is greater in the main flow than in the secondary container 26. This is realized by a larger capillary gap in the secondary container 26 compared to the main flow.
  • FIG 2b shows an alternative embodiment of a writing tip 40 ', in which the secondary container 26 is located directly below the writing pen 24.
  • This embodiment has the advantage that the hole usually present in the nib can be used as ventilation 28 of the secondary container 26.
  • the preferred filling of the main fluid channel 16 is again ensured by a capillary negative pressure in that the capillary gap of the main flow is made larger than the capillary gap in the secondary flow, that is to say the capillary gap which is formed by the secondary liquid channel 26a and the storage area 26b.
  • 2c shows a further possibility of designing the writing tip 40 ′′, the secondary container in the exemplary embodiment shown in FIG. 2c being dimensioned in such a way that its volume increases disproportionately in the filling direction, which is due to the non-parallel arrangement of the fill level sensor 30 with the writing pen 24 is reached. A decreasing capillary pressure in the secondary container 26 is thus achieved with an increasing fill level.
  • 2c also shows a section of the electronics belonging to the valve control 32, which can be connected to the fill level sensor 30, for example by means of bond wires 34.
  • the surface of the secondary container and the surface of the main fluid channel should be wetting, so that the liquid, that is to say the ink in the example of the writing instrument, does not automatically leak without a customer.
  • the opening of the secondary container to the environment should be non-wetting in order to minimize the rate of evaporation.
  • the embodiment shown in FIG. 2a has the advantage over the vents shown in FIGS. 2b and 2c that a long channel with a small cross section is provided.
  • the embodiment shown in FIGS. 2b and 2c is easy to implement, since the opening does not have to be provided, especially since the hole usually present in the nib 24 can be used.
  • a capacitive fill level sensor which has an electrode arrangement, a passivation layer which is arranged on the electrode arrangement and has a contact electrode.
  • the contact electrode is in electrically conductive contact with the electrically conductive ink, so that the electrically conductive ink as a capacitor electrode, the electrode arrangement as another capacitor electrode, and the region of the passivation layer which is wetted by the electrically conductive liquid as a dielectric a measuring capacitor acts, the capacity of which depends on the degree of wetting of the passivation layer by the electrically conductive liquid. Because of the use of the liquid to be measured as an electrical conductor and thus as a capacitor plate, such a sensor is distinguished by a high sensitivity and by a very low dependence on the liquid to be measured.
  • Suitable materials for the design of the main fluid channel and the secondary container are polypropylene (PP), polycarbonate (PC) or LCP. These materials are not wetting per se, but can be activated and stained well in order to have wetting surface properties. ABS should also be mentioned in particular for the wetting materials.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pens And Brushes (AREA)
  • Coating Apparatus (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Telephone Function (AREA)
  • Ink Jet (AREA)

Claims (16)

  1. Dispositif de dosage pour le dosage à la demande d'un liquide (12), avec les caractéristiques suivantes :
    un réservoir primaire (10) pour le stockage du liquide (12) ;
    un point de distribution (22) pour la distribution du liquide ;
    un conduit principal de liquide (16) entre le réservoir primaire (10) et le point de distribution (22) ;
    un réservoir secondaire (26) pour le stockage intermédiaire du liquide, le réservoir secondaire (26) comportant une aération (28) ;
    une soupape (18) ;
    un capteur (30) pour mesurer le niveau de remplissage dans le réservoir secondaire (26) ; et
    un dispositif (32) pour ouvrir la soupape (18) en fonction d'un niveau de remplissage prédéterminé dans le réservoir secondaire,
       caractérisé
       en ce que le réservoir secondaire (26) est relié à un point d'embranchement (20) dans le conduit principal de liquide (16), le réservoir secondaire (26) étant couplé au conduit principal de liquide (16) de telle manière que le conduit principal de liquide se remplisse de liquide de préférence avant le réservoir secondaire (26), et
       en ce que la soupape (18) est placée entre le réservoir primaire (10) et le point d'embranchement (20).
  2. Dispositif de dosage selon la revendication 1, dans lequel le réservoir primaire (10) est aéré et présente une pression de gaz qui correspond à la pression ambiante.
  3. , Dispositif de dosage selon la revendication 1, dans lequel le remplissage préféré du conduit principal de liquide (16) avant le réservoir secondaire (26) est obtenu par un dimensionnement capillaire différent des deux éléments.
  4. Dispositif de dosage selon la revendication 3, dans lequel la dépression capillaire dans le conduit principal de liquide (16) est supérieure à celle dans le réservoir secondaire (26).
  5. Dispositif de dosage selon la revendication 4, dans lequel une fente capillaire du conduit principal de liquide (16) est plus grande qu'une fente capillaire du réservoir secondaire (26).
  6. Dispositif de dosage selon l'une des revendications précédentes, dans lequel le réservoir secondaire (26) comporte, à son extrémité dirigée vers le point d'embranchement (20), un conduit secondaire de liquide (26a) qui relie le point d'embranchement (20) à une zone de stockage (26b) du réservoir secondaire (26), le capteur (30) étant disposé dans la zone de stockage (26b) du réservoir secondaire (26).
  7. Dispositif de dosage selon l'une des revendications précédentes, dans lequel la surface du conduit principal de liquide (16) est mouillable.
  8. Dispositif de dosage selon l'une des revendications précédentes, dans lequel la surface du réservoir secondaire (26) est mouillable.
  9. Dispositif de dosage selon l'une des revendications précédentes, dans lequel le réservoir secondaire (26) présente une pression capillaire dépendant du niveau de remplissage.
  10. Dispositif de dosage selon la revendication 9, dans lequel une section transversale du réservoir secondaire (26) augmente en même temps que le sens de remplissage croissant, perpendiculairement au sens de remplissage.
  11. Dispositif de dosage selon l'une des revendications précédentes, dans lequel l'aération du réservoir secondaire (26) est réalisée par une ouverture vers l'extérieur, l'ouverture étant disposée dans le réservoir secondaire (26) de telle manière que le liquide l'atteint seulement lorsque le réservoir secondaire est rempli au maximum.
  12. Dispositif de dosage selon la revendication 11, dans lequel l'ouverture est réalisée de manière non mouillable.
  13. Dispositif de dosage selon la revendication 11 ou 12, dans lequel l'ouverture présente une petite section transversale et est en communication fluidique avec le réservoir secondaire (26) par l'intermédiaire d'une grande longueur de conduit (28a).
  14. Instrument d'écriture pour un fluide d'écriture liquide, avec les caractéristiques suivantes :
    un dispositif de dosage selon l'une quelconque des revendications 1 à 13 ;
    un dispositif d'écriture (24) qui est couplé au point de distribution (22).
  15. Instrument d'écriture selon la revendication 14, qui est configuré comme un stylo-plume dans lequel le fluide d'écriture liquide est de l'encre et dans lequel le dispositif d'écriture (24) est une plume.
  16. Instrument d'écriture selon la revendication 15, dans lequel l'aération (28) du réservoir secondaire (26) est réalisée par un trou dans la plume (24).
EP01982455A 2000-11-03 2001-10-31 Dispositif de dosage et instrument d'ecriture pourvu d'un tel dispositif Expired - Lifetime EP1333994B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10054599 2000-11-03
DE10054599A DE10054599C1 (de) 2000-11-03 2000-11-03 Dosiervorrichtung und Schreibgerät mit einer Dosiervorrichtung
PCT/EP2001/012647 WO2002036361A1 (fr) 2000-11-03 2001-10-31 Dispositif de dosage et instrument d'ecriture pourvu d'un tel dispositif

Publications (2)

Publication Number Publication Date
EP1333994A1 EP1333994A1 (fr) 2003-08-13
EP1333994B1 true EP1333994B1 (fr) 2004-12-29

Family

ID=7662080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01982455A Expired - Lifetime EP1333994B1 (fr) 2000-11-03 2001-10-31 Dispositif de dosage et instrument d'ecriture pourvu d'un tel dispositif

Country Status (7)

Country Link
US (1) US7093994B2 (fr)
EP (1) EP1333994B1 (fr)
AT (1) ATE285906T1 (fr)
AU (1) AU2002214037A1 (fr)
DE (2) DE10054599C1 (fr)
ES (1) ES2233704T3 (fr)
WO (1) WO2002036361A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006013920A1 (de) * 2006-03-25 2007-09-27 Diplomat Cunewalde Gmbh Tintenschreibgerät und Verfahren zur Steuerung des Tintenflusses an der Schreibfederspitze
US10889143B2 (en) * 2016-10-28 2021-01-12 Ganesh Ram Jangir Refillable writing instrument
CN108086301A (zh) * 2018-01-31 2018-05-29 王楠 敏感建、构筑物加固变形控制装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211586C2 (de) 1982-03-30 1984-03-22 Walter Ing. Anweiler (grad.), 6907 Nußloch Tintenleiter für Füllfederhalter
DE3311364A1 (de) 1983-03-29 1985-01-17 Walter Ing. Anweiler (grad.), 6907 Nußloch Tintenleiter fuer fuellfederhalter
DE3220750A1 (de) 1982-06-02 1983-12-08 Montblanc-Simplo Gmbh, 2000 Hamburg Tintenversorgungssystem fuer mit fluessiger tinte arbeitende schreibgeraete
DE3321301A1 (de) * 1983-06-13 1984-12-13 Montblanc-Simplo Gmbh, 2000 Hamburg Tintenversorgungssystem fuer mit fluessiger tinte arbeitende schreibgeraete
DE3926271A1 (de) 1989-08-09 1991-02-14 Geha Werke Gmbh Tintenleiter fuer fluessigkeits-schreibgeraete
DE4135605A1 (de) * 1991-10-29 1993-05-06 Rotring-Werke Riepe Kg, 2000 Hamburg, De Schreib- oder zeichengeraet
DE4313180C2 (de) * 1993-04-19 1995-04-27 Rotring Int Gmbh Schreib- oder Zeichengerät
DE4416880A1 (de) 1993-10-04 1995-07-27 Draegerwerk Ag Füllfederhalter mit einer Belüftung des Tintenvorratsbehälters
DE4443212A1 (de) 1994-12-05 1996-06-13 Neidhart Clip Lok Gmbh & Co Kg Behälter mit faltbaren Seitenwänden

Also Published As

Publication number Publication date
EP1333994A1 (fr) 2003-08-13
DE10054599C1 (de) 2002-04-18
ES2233704T3 (es) 2005-06-16
AU2002214037A1 (en) 2002-05-15
DE50104993D1 (de) 2005-02-03
US20040090492A1 (en) 2004-05-13
US7093994B2 (en) 2006-08-22
WO2002036361A1 (fr) 2002-05-10
ATE285906T1 (de) 2005-01-15

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