EP1837200A2 - Instrument pour écrire à encre et procédé destiné à la commande du flux d'encre sur la pointe de la plume d'écriture - Google Patents

Instrument pour écrire à encre et procédé destiné à la commande du flux d'encre sur la pointe de la plume d'écriture Download PDF

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Publication number
EP1837200A2
EP1837200A2 EP07005437A EP07005437A EP1837200A2 EP 1837200 A2 EP1837200 A2 EP 1837200A2 EP 07005437 A EP07005437 A EP 07005437A EP 07005437 A EP07005437 A EP 07005437A EP 1837200 A2 EP1837200 A2 EP 1837200A2
Authority
EP
European Patent Office
Prior art keywords
ink
writing
control
capillary
micropump
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.)
Withdrawn
Application number
EP07005437A
Other languages
German (de)
English (en)
Other versions
EP1837200A3 (fr
Inventor
Dietrich Dr.-Ing. Roscher
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.)
DIPLOMAT Cunewalde GmbH
Original Assignee
DIPLOMAT Cunewalde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DIPLOMAT Cunewalde GmbH filed Critical DIPLOMAT Cunewalde GmbH
Publication of EP1837200A2 publication Critical patent/EP1837200A2/fr
Publication of EP1837200A3 publication Critical patent/EP1837200A3/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K29/00—Combinations of writing implements with other articles
    • B43K29/08—Combinations of writing implements with other articles with measuring, computing or indicating devices
    • 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
    • B43K5/02—Ink reservoirs
    • B43K5/14—Exchangeable ink cartridges
    • 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 invention relates to an ink writing instrument, in particular a fountain pen and a method for controlling the ink flow at the nib tip.
  • an electronically controllable valve is arranged between the reservoir and the capillary secondary fluid container, which is opened or closed depending on the level in the secondary container.
  • the exiting writing fluid is metered by a pumping element which pushes the writing fluid to the nozzle of the writing tip.
  • the pumping element is activated via a pressure transducer and a microcircuit, in that when the writing tip is placed on the paper, a piezo quartz tube gives the start and stop signal for the microcircuit, and the ascertained contact force determines the pumping frequency of the pumping element.
  • a liquid reservoir is a removable cartridge which is pierced when inserted on both sides with cannulas, wherein in the bottom of the cartridge, a partition made of semipermeable material is embedded, which is permeable to air and impermeable to the ink.
  • variable volume liquid reservoirs are used both as a primary reservoir and a secondary fluid reservoir.
  • an electronically controlled valve between the two liquid containers, is opened and closed depending on the pressure conditions in the secondary liquid container.
  • the primary reservoir is under an overpressure, so that upon opening of the valve writing fluid flows into the secondary fluid reservoir and fills this container again.
  • the secondary fluid reservoir must be under negative pressure, so that the writing fluid does not leak through the pen tip, the necessary forces in turn by the negative pressure of the chamber in which the secondary fluid reservoir is located or difficult to control forces of elasticity of the variable volume Liquid reservoir applied.
  • the pressure conditions are again subject to the conditions of the environment such as temperature and atmospheric pressure, what you just avoided wanted to.
  • the ink discharge from the primary liquid container is influenced to the secondary liquid container via an electronically controllable valve.
  • the secondary liquid container is, as in conventional, ie not electronically controlled writing instruments usual, arranged at a branch between the reservoir and the delivery point of the writing fluid, for example on a nib.
  • the electronically controlled valve control signal provides a sensor that measures the level of the capillary secondary fluid reservoir. It is expected that this electronically controlled valve will operate much more precisely than the capillary closure of the primary fluid tank vent used in conventional writing instruments.
  • valve control for the discharge of writing fluid from the reservoir is that the pressure conditions in the writing system are different, depending on whether the valve is open or closed or the secondary fluid container is filled or emptied. Also can not compensated by this arrangement, the different suction behavior of the paper and a desired line intensity can be adjusted.
  • a flow meter which measures the actual flow of the writing fluid to the writing tip and compares it with a target value which results from the application force of the writing tip.
  • the difference between the two values provides a control signal for a micropump.
  • the valve between the storage tank and the secondary liquid tank is only opened when the capacity of the micropump exceeds a specified maximum value.
  • a small secondary liquid container for writing fluid is arranged for dynamic decoupling. This arrangement ensures both the independence of the ink flow from the opening state of the valve between the reservoir and the secondary liquid container and the adjustability of the line width depending on the paper quality.
  • the invention has for its object to provide a metering device for a liquid, in particular writing fluids, with compensation of air pressure and temperature changes by electronic control circuits whose individual writing behavior in terms of placement force and writing direction corresponds to a conventional, not electronically controlled fountain pen, beyond ways to Setting the line intensity and the adjustment of the ink flow to the respective paper quality and also works very energy efficient.
  • the object is achieved in that a first control circuit using different capillary forces of at least two Steuerkapillaren and a micropump optimal conditions for the supply of a conventional writing insert in all operating conditions and ensures that a second control circuit consisting of a valve with electronic control the Refilling the control capillaries concerned.
  • a third control loop with a second micropump, a flow meter, and a tandem capillary of stepped cross section becomes effective.
  • the invention represents a further improvement of the writing instrument, as already in the DE 102 12 278 has been described.
  • FIG. 1 shows first the scheme of a conventional fountain pen, as it has been known for at least 100 years.
  • the writing liquid from the capillary system of the secondary liquid container 6 is pulled against the capillary force acting in this container by the suction force of the paper, which is formed by the paper capillarity 11.
  • the process is initiated by overcoming a capillary interruption on the writing spring 62 when placed on the paper surface 12 and supported by the hydrostatic pressure in the main channel 8.
  • the nib 62 is known to be split and has a bevel for scratch-free writing individually for right or left handed.
  • the writing spring 62 is divided, the ink flow is spread and distributed to several paper capillaries 11. As a result, the line width increases and there is the characteristic of a fountain pen individual typeface.
  • the process of removing writing fluid 2 from the secondary ink container 6 continues until this container is largely emptied. Further writing creates a negative pressure in the Main channel 8, since due to the surface tension of the writing fluid 2 and the channel constrictions 13 forming menisci no air can be drawn through the secondary fluid container 6 into the main channel 8.
  • the resulting negative pressure continues through the main channel 8 in the reservoir 1 and causes an increase in the negative pressure of the air volume.
  • the vent valve 4 which is often designed as a short channel is closed by a liquid meniscus. If the negative pressure in the air volume 3 exceeds a certain level, the meniscus ruptures and an air bubble penetrates into the reservoir 1, which leads to a reduction of the negative pressure in the air volume 3. As a result, writing fluid 2, supported by the capillary forces, flows through the main channel 8 in the chambers of the secondary fluid container 6 until this process is interrupted by the capillary restriction 7. The negative pressure in the entire system, in particular in the reservoir 1, is reduced until a liquid meniscus again forms on the venting valve 4 and prevents further air entry.
  • Fig. 2 illustrates the pressure profile of the air volume 3 in the reservoir 1.
  • the operation of the conventional writing system can be represented by an electrical analogy corresponding to FIG.
  • the hydrostatic pressure P p in the reservoir 1 represents in the electrical analogy an electro-motive force (EMF), which is completely compensated when the vent valve 4 is closed by the negative pressure P L of the air volume.
  • EMF electro-motive force
  • These two voltages change depending on the degree of filling of the reservoir 1 and position of use of the writing instrument. If the meniscus breaks through in the venting valve 4, the hydrostatic pressure Pp acts and a current I L flows into the capacitor C T.
  • the switch S v stands for the vent valve 4.
  • the capillary secondary liquid container 6 is shown as a capacitor C T , which receives charge and due to its charging voltage again charge can deliver as current flow over time. Connected in series is an EMF E Z , which symbolizes the capillary force of the secondary liquid container 6.
  • Another EMK with the voltage Ep represents the suction behavior of the paper. This tension also varies and depends on the respective paper properties.
  • the switch S U symbolizes the placement of the writing spring 62 on the paper 12 and thus entering flow I S of the writing fluid 2.
  • various resistors R S , R T and R V are arranged, for the flow resistance of the individual functional elements and Connecting channels are available.
  • the resistor R S represents a variable resistor whose magnitude depends on the acting contact force P S.
  • Wing feathers are known, for example, which are characterized by a special oscillatory behavior of the side wings, a special inner grinding which makes it easy to skip the ink when the paper surface is touched, and certain material properties.
  • an electronically controlled writing implement should respect and support this personal character .
  • a possibility is shown, as can be controlled by means of a control capillary 14 and a compensation capillary 17 in combination with a micropump 30 of the pressure at point N during the operating conditions A and B to the optimal writing optimum value P Nset .
  • a control capillary 14 or compensation capillary 17 consists of a capillary which is closed at one end with a Kapillarfalle 16 or 19, at the other end with an air-permeable membrane 15 or 18 or with another Kapillarfalle.
  • the air-permeable membrane 15 or 18 is impermeable to liquids and can be made, for example, from hydrophobic coated fabric.
  • the meniscus 21 is located in the control capillary 14 between the two possible end positions.
  • the capillary 14 has a capillary force E Z , which generates in interaction with the suction force of the paper E P and the fixed resistors R F and R T and the variable resistor R S an optimal typeface of a fountain pen.
  • E Z capillary force
  • the intensity of the typeface can be determined to a certain extent by changing the average flow I s .
  • the capillary section 22 is emptied and the meniscus 21 moves in the direction of the capillary trap 16.
  • the micropump 30 starts in the pump control loop to regulate the negative pressure to the target value P Nsoll .
  • the micro-valve 32 is opened and writing fluid 2 flows after. This reduces the negative pressure P N measured by the pressure gauge 31 for a short time below the setpoint value P Nsetpoint .
  • the micropump 30 switches the pumping direction and generates a pressure P D against the flow direction of the writing fluid 2, so that the actual value P N again corresponds to the desired value P Nsoll .
  • the ink flow I L which flows from the storage container 1 through the microvalve 32 through the main channel 8, is divided into a flow into the compensation capillary 17 and into the control capillary 15 and into a flow I S in the direction of the nib 9.
  • the self-adjusting back pressure P D of the micropump reaches a maximum when both the control capillary 14 and the compensation capillary 17 are filled and the suction effect of both capillaries is eliminated.
  • the full hydrostatic pressure P P of the writing fluid 2 acts in the reservoir 1.
  • the stabilization of the back pressure P D to a stationary value causes the closing of the microvalve 32.
  • the writing system in turn returns to the operating state A, in which a pumping action of the micropump 30 is not required.
  • the corresponding equivalent circuit diagram is shown in FIG. 8.
  • FIG. 6 An alternative construction, in which the micropump 30 and the control capillary 14 and the compensation capillary 17 are arranged sequentially in a tandem capillary 20, is shown in FIG. 6.
  • the meniscus 21 is in the operating state A in the capillary section 25 of the tandem capillary 20. If the meniscus 21 in FIG pulled the channel portion 24, the micro-valve 32 opens and writing fluid 2 flows after.
  • the micropump 30 in turn assumes the stabilization of the pressure P N , which is measured with the pressure gauge 31, to a desired value P Nsoll .
  • the arrangement of the micropump 30, the filling of the tandem capillary 20 is supported.
  • FIG. Another arrangement of the invention is shown in FIG. Again, in a tandem capillary 20, the individual control capillaries in the form of various capillary sections 24 to 27 arranged sequentially one behind the other.
  • the special feature is that in the operating state A two capillary sections 25 and 26 are available, which have a different cross section and thus a different capillary force.
  • different intensities of the flow l S of the writing fluid can be set, depending on in which channel section 25 or 26 the meniscus is located.
  • the opening of the microvalve 32 and the activation of the micropump 33 are triggered when the meniscus 21 leaves a channel section and is drawn into the next channel section.
  • Another micropump 34 may be used to achieve rapid switching of the intensity of the writing line from high intensity to low intensity. Both micropumps 30 and 34 are activated in order to quickly pump out the channel section 26 and to pump excess writing fluid 2 back into the storage container 1. With the aid of a flow meter 33, it is possible to measure the mean flow I S and to respond to the measured value by switching to another channel section 25 or 26.
  • the representation of two channel sections 25 and 26 is to be regarded only as an example. In principle, more than two channel sections are conceivable in which the meniscus 21 is in the operating state. In general, an arrangement with two micropumps 30 and 34 is useful if, in addition, the leakage flow of the microvalve 32 should be compensated.
  • Fig. 9 shows a section.
  • the needle 49 contacts the reservoir 1, which is designed in the form of a cartridge.
  • the writing fluid 2 enters the valve chamber 45 and from there into the nozzle channel 54.
  • the inlet opening 47 can be closed by a valve tappet 53.
  • the valve stem 53 itself is moved by a valve drive 42, which is designed for example as a magnetic or piezo drive.
  • the pumping chamber 59 connects, which in turn communicates with the pressure measuring chamber 56 via the connecting channel 38.
  • the pressure sensor 44 is fluidically coupled via the pressure equalization channel 55.
  • the writing fluid 2 then flows via the fluidic adapter 48 into the cannula 50, which is fluidically coupled to the writing insert 60.
  • the entire main channel 8 described in FIGS. 4, 6 and 7 consists in the described exemplary construction of the needle 49, the inlet opening 47, the valve chamber 45, the nozzle channel 54, the pumping chamber 59, the connecting channel 38, the pressure measuring chamber 56, the fluidic adapter 48 and the cannula 50.
  • the complete fluidic structure on the channel body 40 is covered by a cover membrane 39 made of LTCC (Low-Temperature Ceramics) ceramic, which is connected to the electronics carrier 41, which is also made of LTCC ceramic, by means of a sintering process.
  • the cover membrane 39 also serves as a carrier of the piezo plate 43.
  • Cover membrane 39 and piezo plate 43 together form a bimorph, that is, when the piezo plate is subjected to a voltage, the bimorph deforms and causes a pressure on the pumping chamber 59.
  • the volume displacement depends on the to the poles of the piezo plate 43 applied pulse shape and size.
  • the channel body 40 itself is made of glass, for example, which has been etched.
  • FIG. 11 is shown by a section of the writing module 70, as the hydrophobic membrane 57 between the circuit board 52, electronics carrier 41 and the channel body 40 is fixed.
  • Fig. 12 shows a cross section through the writing instrument with writing insert 60 in the front part of the housing base 73.
  • the writing insert 60 is modeled in its execution a conventional fountain pen and consists of the nib 62 with the nib 61, a nib 69 with integrated ink duct 9 as an extension of Main channel 8 and is connected via the coupling 63 with the cannula 50 of the writing module 70.
  • In the upper housing part 72 are located as a reservoir 1, an ink cartridge and a battery compartment for receiving the battery 71.
  • the battery compartment is closed by a cover 74.
  • the storage container 1 designed as an ink cartridge is closed with a sealing plug 75 which is pierced with a needle 49 when it is inserted into the writing instrument.
  • the needle 49 is mounted in the writing module 70 as shown in Fig. 9, and includes all fluidic functional elements such as micropumps, reservoirs and valves. From the writing module 70, the writing fluid 2 passes via a cannula 50 and an elastic coupling 63 to the writing insert 60 of conventional design. One or more LEDs 65 indicate the operating state of the device. Laterally attached to the housing base 73 is a touch contact 66, which signals the controller that a writing process is imminent. This operating element 66 can be combined with the opening of the cap 76, so that after prolonged leaving of the Writing implement with the cap removed 76 first by the micropump 30 a small amount of writing fluid 2 is conveyed to the writing insert 60 to bridge any capillary breaks in the ink channel 62 and to allow an immediate cover letter.
  • This operating element 66 can be combined with the opening of the cap 76, so that after prolonged leaving of the Writing implement with the cap removed 76 first by the micropump 30 a small amount of writing fluid 2 is conveyed to the writing insert 60 to bridge any ca
  • the method of controlling ink flow at a nib tip 61 of an ink pen is characterized by setting a constant operating pressure P N at the input of the pen 60 by a feedback loop comparing the actual pressure with a nominal operating pressure P NSoll, the pressure differential being bidirectional Micropump 30 is adjusted.
  • the setpoint of the operating pressure P Nsoll for the writing insert 60 is dimensioned so that in a conventional writing insert 60 with conventional writing spring 62 results in a characteristic for a fountain pen line depending on placement force and writing direction.
  • the capillary force in the control capillary 14, 17 for compensating the suction force of the paper and the hydrostatic pressure is dimensioned such that when the microvalve 32 is closed, the nominal operating pressure for the writing insert 60 is established without a pumping action of the micropump 30 being required.
  • the micropump 30 is advantageously effective only when 32 pressure fluctuations in deviation from the setpoint of the operating pressure P Nsoll occur when opening the microvalve or correcting other deviations from the default settings of the ink writing device, such as leakage flow of the microvalve 32 or deviating from the norm suction of the paper .
  • a further embodiment of the method consists in that different capillary sections 24, 25, 26 of the control capillary 28 can be selected and thus different target operating pressures P Nset for the writing tip tip 61 can be set for different writing intensities .
  • the flow resistance in the coupling 63 between the main channel 8 and the ink guide 9, as shown in Fig. 13, for example, by means of a hose clamp 67 is adjustable and thus the placement force due to the modulation of the writing line is affected.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Pens And Brushes (AREA)
EP07005437A 2006-03-25 2007-03-16 Instrument pour écrire à encre et procédé destiné à la commande du flux d'encre sur la pointe de la plume d'écriture Withdrawn EP1837200A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610013920 DE102006013920A1 (de) 2006-03-25 2006-03-25 Tintenschreibgerät und Verfahren zur Steuerung des Tintenflusses an der Schreibfederspitze

Publications (2)

Publication Number Publication Date
EP1837200A2 true EP1837200A2 (fr) 2007-09-26
EP1837200A3 EP1837200A3 (fr) 2008-06-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07005437A Withdrawn EP1837200A3 (fr) 2006-03-25 2007-03-16 Instrument pour écrire à encre et procédé destiné à la commande du flux d'encre sur la pointe de la plume d'écriture

Country Status (3)

Country Link
EP (1) EP1837200A3 (fr)
DE (1) DE102006013920A1 (fr)
WO (1) WO2007110042A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018229443A1 (fr) * 2017-06-15 2018-12-20 Societe Bic Instrument d'écriture à encre libre comprenant une valve microfluidique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021441B4 (de) * 2008-04-29 2020-08-06 Linhardt Gmbh & Co. Kg Applikationsstift
WO2020132829A1 (fr) * 2018-12-24 2020-07-02 深圳市柔宇科技有限公司 Outil d'écriture et son procédé de commande d'écriture

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4419735A1 (de) * 1994-06-06 1995-12-07 Gerhard Bihler Füller
DE10054599C1 (de) * 2000-11-03 2002-04-18 Hahn Schickard Ges Dosiervorrichtung und Schreibgerät mit einer Dosiervorrichtung
DE10212279A1 (de) * 2002-03-20 2003-10-02 Roscher Dietrich Tintenschreibgerät
DE10212278A1 (de) * 2002-03-20 2003-10-02 Dietrich Roscher Tintenschreibgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE4328312A1 (de) * 1993-08-23 1995-03-02 Draegerwerk Ag Füllfederhalter mit variablem Füllreservoir zum Druckausgleich zwischen Reservoir und Umgebung
DE10054597B4 (de) * 2000-11-03 2006-02-09 Gebr.Schmidt Gmbh & Co.Kg Vorratstank für ein Dosiersystem und Dosiersystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4419735A1 (de) * 1994-06-06 1995-12-07 Gerhard Bihler Füller
DE10054599C1 (de) * 2000-11-03 2002-04-18 Hahn Schickard Ges Dosiervorrichtung und Schreibgerät mit einer Dosiervorrichtung
DE10212279A1 (de) * 2002-03-20 2003-10-02 Roscher Dietrich Tintenschreibgerät
DE10212278A1 (de) * 2002-03-20 2003-10-02 Dietrich Roscher Tintenschreibgerät

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018229443A1 (fr) * 2017-06-15 2018-12-20 Societe Bic Instrument d'écriture à encre libre comprenant une valve microfluidique
FR3067652A1 (fr) * 2017-06-15 2018-12-21 Societe Bic Instrument d'ecriture a encre libre comprenant une valve microfluidique
US11117415B2 (en) 2017-06-15 2021-09-14 Societe Bic Free ink writing instrument with microfluidic valve

Also Published As

Publication number Publication date
WO2007110042A3 (fr) 2008-02-07
EP1837200A3 (fr) 2008-06-25
DE102006013920A1 (de) 2007-09-27
WO2007110042A2 (fr) 2007-10-04

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