EP0221453A1 - Elektrostatischer Druckkopf - Google Patents

Elektrostatischer Druckkopf Download PDF

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Publication number
EP0221453A1
EP0221453A1 EP86114691A EP86114691A EP0221453A1 EP 0221453 A1 EP0221453 A1 EP 0221453A1 EP 86114691 A EP86114691 A EP 86114691A EP 86114691 A EP86114691 A EP 86114691A EP 0221453 A1 EP0221453 A1 EP 0221453A1
Authority
EP
European Patent Office
Prior art keywords
electrode
counter
groups
electrodes
cylindrical
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.)
Granted
Application number
EP86114691A
Other languages
English (en)
French (fr)
Other versions
EP0221453B1 (de
Inventor
Patrice Playe
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.)
ALCATEL BUSINESS SYSTEMS
Original Assignee
La Telephone Industrielle et Commerciale Telic Alcatel SA
Alcatel Business Systemes SA
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 La Telephone Industrielle et Commerciale Telic Alcatel SA, Alcatel Business Systemes SA filed Critical La Telephone Industrielle et Commerciale Telic Alcatel SA
Publication of EP0221453A1 publication Critical patent/EP0221453A1/de
Application granted granted Critical
Publication of EP0221453B1 publication Critical patent/EP0221453B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/39—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material using multi-stylus heads
    • B41J2/395—Structure of multi-stylus heads

Definitions

  • the present invention relates to printing devices using a plurality of individual electrodes aligned in at least one row for printing a recording medium displaced in front of these electrodes.
  • It relates more particularly to an electrostatic print head by means of which a latent electrostatic image is gradually created on the recording medium, by ionic discharge obtained by carrying the high voltage electrodes, while the recording medium is moved in front of the head.
  • the individual electrodes used in the print head are of very small dimensions and in high number for a line of given length, if a good resolution is to be obtained; for example, there will be 1,728 for the printing of an A4 format recording medium at 8 points per millimeter.
  • a counter-electrode brought to a high voltage of opposite polarity to that of the latter is associated with the electrodes, in order to avoid the application to the electrodes only of the high high voltage necessary for ionic discharge for printing. of the electrostatic image. Under these conditions, the high voltage required for the ionic discharge will be applied to each electrode / counter electrode pair, the high voltage applied to the electrode alone, or to the counter electrode alone, being less than the threshold value causing this ionic discharge and therefore unable to allow printing.
  • a thin insulating film, stored in a roll is usually used as an intermediate recording medium on which the latent electrostatic image is recorded, which is then inked, for example using '' a magnetic brush carrying powder ink.
  • the electrostatic image thus developed is then transferred from the intermediate support to a final support, usually made of paper and in the form of separate or separable sheets, for example by contact between intermediate support and final support, under high pressure.
  • the final support consisting of a base of conductive paper covered by a fine dielectric deposit allowing successively the formation of a latent image and the fixing of the image, revealed by inking, on the same support possibly using the means mentioned above.
  • European patent application No. 0124,856 describes an electrostatic printhead composed first of at least one row of individual electrodes arranged in regular pitch and organized in "n" groups, these groups being organized in successive sets of 'at least two groups and those of their electrodes, which have the same position in the groups and which belong to groups having the same ranks in the sets, being interconnected with one another.
  • the electrostatic printhead mentioned above is secondly composed of a counter electrode facing the electrodes over at least the length of the row considered and this counter electrode is made of a resistive material with which they are in contact.
  • "n + 1" conductors arranged at regular intervals, substantially equal to the pitch of the groups of electrodes in the row.
  • the “n + 1” conductors define between them “n” resistive portions of substantially identical values which are connected in series, respectively arranged each opposite one of the groups of electrodes and each assigned to the selection of said group from the others .
  • the present invention therefore firstly proposes a counter-electrode arrangement making it possible to incorporate part of its control electronics therein in order to reduce the number of connections.
  • the movement of the printing medium (s) between the electrodes and the counter-electrode creates wear by friction of the latter and unnecessary braking of the moving medium.
  • the present invention therefore also provides an arrangement of counter-electrode as indicated above which aims to reduce the braking of the support and the wear of the counter-electrode.
  • the counter electrode is composed of a cylindrical or semi-cylindrical external resistive layer covering the conductors constituted by rings or sectors of parallel rings which have the same axis as the resistive layer and which are individually connected. at the outputs of an electronic circuit for selective voltage switching placed at least partially in the concavity of said electrode.
  • the counter electrode which is of cylindrical shape of revolution is mounted to rotate about an axis perpendicular to the direction of movement of the recording medium which has just been inserted, pressed against it, between the individual electrodes and herself.
  • Figure 1 is shown the equivalent electrical diagram of an electrostatic print head as provided in the European patent application mentioned above, this head has a counter electrode 1 associated with a set of electrodes 2 comprising at least a row of electrodes 20.
  • the individual electrodes 21 are arranged in regular pitch and organized into two networks of n identical groups denoted G1 to G n in each of which they occupy successive rows denoted P1 to P m .
  • the electrodes of the same rank belonging to the odd groups G1, G3 .... are interconnected with one another.
  • the electrodes of the same rank belonging to the even groups G2, G4 Vietnamese are also interconnected with each other.
  • These electrodes of rows P1 to P m are set to a potential -V or 0 volts, for the odd groups, by means of a first set of m individual switches E11 to E 1m and, for the even groups, by l 'through a second set of m individual switches E21 to E 2m , independent of the first set.
  • the counter electrode 1 is made of resistive material and comprises n + 1 connection conductors C, referenced C1 to C n + 1 , associating each portion of counter electrode between two successive conductors with one of the different groups of electrodes at look of which it is placed.
  • the n + 1 connection conductors define a set of n resistors in series at R1 to R n individually assigned to the groups of electrodes G1 to G n and arranged opposite these groups; the connection conductors C1 to C n + 1 are set to a potential V / 2 or 0 volts by means of n + 1 individual switches CE1 to CE n + 1 , V being the high voltage value necessary for printing.
  • FIG. 2 An example of an electronic circuit for selective switching of voltages intended to serve the resistive counter-electrode 1, is presented in FIG. 2, this example should not be considered as limiting other known circuits such as for example shift register circuits with high voltage output is also likely to be used.
  • the n resistors R are distributed into s groups each comprising at most q-1 resistors R which follow one another on the counter-electrode 1, such as the group of resistors R11, R12, ... R 1 .q-1 .
  • a two-dimensional matrix control type command makes it possible to energize each of the n + 1 connection conductors C of these n resistors R.
  • connection conductor C is connected on the one hand by a diode D to a first switch arrangement, here called line 3, such as the connection conductor C11 connected to the line switch arrangement 31 via the diode D11, on the other hand by a resistor r to a switch arrangement, here called group 4, such as the resistor r11 connecting the connection conductor C11 to the switch arrangement group 41.
  • line 3 such as the connection conductor C11 connected to the line switch arrangement 31 via the diode D11
  • group 4 such as the resistor r11 connecting the connection conductor C11 to the switch arrangement group 41.
  • the switch arrangements 3 and 4 make it possible to apply alternately, according to printing needs, a ground potential or a + V / 2 potential to the connection conductors to which they are connected either by diodes D or by resistors r .
  • connection conductors C of the successive resistors R of the same group are served by the same group switch arrangement 4, at the output S of which these connection conductors are each connected by a resistor r, such as the conductors of connection C11 to C19 respectively connected by resistors r11 to r19 at output S41 of the group switch arrangement 41.
  • group switch arrangement 41, 42, 49 presented here each include a first switching transistor 5, of NPN type, the base of which receives an external control signal according to printing needs via a wire g, such as the wire g1 for transistor 51, to alternately connect the output S of this arrangement to the ground potential or to the potential + V / 2.
  • the junction of the output S of the arrangement to one or the other of these two potentials is effected by means of a Darlington circuit with two transistors 6 and 7, of NPN type, and with two resistors 8 and 9, the emitter of each transistor 7 is connected to the corresponding output S, such as that of transistor 71 to output S41, while the collector of each transistor 7 is connected to the potential + V / 2, as does the collector of the corresponding transistor 6 and one of the terminals of the corresponding resistor 9.
  • the base of each transistor 6 is connected to the collector of the switching transistor 5 of the switch arrangement which comprises it so as to be brought to ground potential, via the emitter of this switching transistor 5, when this transistor conducts.
  • the base of each transistor 7 is controlled by the emitter of transistor 6 of the switch arrangement which includes it.
  • connection conductors C of successive resistors R of the same group are served by different line switch arrangements 3, such as arrangements 31, 32, ... 3 y , each conductor of connection C being connected to the line switch arrangement 3 which serves it by an individual diode D such as the connection conductor C11 connected by the diode D11 to the line switch arrangement 31.
  • Each line switch arrangement 3 is usually connected by its output S3 to the cathodes of the diodes D of several connection conductors C taken in different groups, such as the output S31 of the line switch arrangement 31 to the diodes D11, D21 ... D r1 of conductors C11, C21 ... C r1 of rank 1 of groups 1, 2 ... r of resistances R.
  • Each output S3 of line switch arrangement is also capable of being connected to ground potential or to potential + V / 2, here using a simplified assembly comprising a switching transistor 10 of NPN type, the transmitter is connected to ground, the collector of which is connected to the potential + V / 2, via a resistor 11, and the base of which receives an external control signal according to printing needs via a resistor 12 and a wire 1, such as the base of transistor 10 y via resistor 12 y and wire 1 y .
  • connection conductor C such as the arrangements 31 and 41 for the conductor C11
  • connection conductor concerned remains at ground potential
  • connection conductors C are supplied sequentially two by two.
  • the electronic circuit for selective switching of the voltages defined above in connection with FIG. 2 is conventionally produced on a physical support constituted for example by a printed circuit board referenced 15 in FIGS. 3 and 4.
  • this circuit is closely associated with the counter-electrode 1 which it serves, which has a cylindrical or possibly semi-cylindrical shape in the concavity from which the printed circuit board 15 is placed.
  • FIG. 3 shows a counter-electrode 1 chosen to be cylindrical and of revolution insofar as it is intended to be mounted for rotation, a semi-cylindrical shape which may prove to be advantageous in the case of a fixed counter-electrode.
  • the counter-electrode with circular section in FIGS. 3 and 4 comprises annular connection conductors C connected for example by pins P intended to provide electrical connections with the conductive tracks of the printed circuit board 15 which in particular carries the resistors r and the diodes D, such as the connection conductor C11 connected by pins P11 and P'11 on the one hand to the diode D11 on the other hand to the resistor r11.
  • the printed circuit board 15 is arranged in a median longitudinal plane of the circular section cylinder formed by the counter electrode between two semi-cylindrical shells 16, 16 ′ of insulating material which adjusts one on the other to form the assembly of said counter-electrode.
  • the rings or the sectors of rings which form the connection conductors C are placed for example in external circular grooves of the assembly formed by the two assembled half-shells.
  • the pins P are flush with the outside of the half-shells 16, 16 ′ for the connection of the rings or sectors of rings to which they are for example welded.
  • the pins P are here arranged in the plane of the rings they serve, and pass through the assembly formed by the half-shells assembled by not shown notches which are formed at the joint plane of these half-shells.
  • the resistor r and the diode D assigned to a ring connection conductor C are arranged at this ring in the counter-electrode and more precisely on the printed circuit board 15, the pins P and P 'serving this resistor and this diode being arranged symmetrically with respect to the axis of the counter electrode and in the plane of said ring.
  • connection conductors C The two joined half-shells 16, 16 ′, carrying the rings formed by the connection conductors C, are covered as well as these rings by a layer 17 of flexible resistive material of small thickness, the resistivity of which is for example of the order of 107 or 108 ohm / cm; the resistors R between connection conductors are formed by the zones of this layer 17 located between the rings.
  • the counter-electrode 1 thus formed is intended to cooperate with a set 2 of electrodes 20 seen in profile in FIG. 3, the electrodes being arranged, in at least one row and preferably two, parallel to a generator of the cylinder which the counter-electrode 1, so as to allow the passage of the intermediate support 18 between electrode 2 and counter-electrode 1.
  • the counter-electrode 1 is not provided for rotation, it is of course possible that it is semi-cylindrical, the printed circuit board 15 remaining placed in its concavity for reasons of convenience.
  • the counter-electrode is provided for rotating and for example idle around its axis XX ′ (FIG. 4), it is necessary to provide for the supply of the electronic voltage switching circuit carried by the printed circuit board; this is done for example using a conventional device with rings 19 integral with the rotating part, that is to say with the counter-electrode 1, and with fixed friction brushes 21 connected to a connector 23, also fixed, by different control wires 23 of the electronic voltage switching circuit.
  • the counter-electrode 1 is carried by bearings or bearings 25, only one of which is shown, so as to rotate under the action of the intermediate support 18 which rubs against it.

Landscapes

  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP86114691A 1985-10-28 1986-10-23 Elektrostatischer Druckkopf Expired - Lifetime EP0221453B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8515979 1985-10-28
FR8515979A FR2589274B1 (fr) 1985-10-28 1985-10-28 Tete d'impression electrostatique

Publications (2)

Publication Number Publication Date
EP0221453A1 true EP0221453A1 (de) 1987-05-13
EP0221453B1 EP0221453B1 (de) 1990-05-09

Family

ID=9324263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114691A Expired - Lifetime EP0221453B1 (de) 1985-10-28 1986-10-23 Elektrostatischer Druckkopf

Country Status (4)

Country Link
US (1) US4689643A (de)
EP (1) EP0221453B1 (de)
DE (1) DE3670984D1 (de)
FR (1) FR2589274B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667565A2 (de) * 1994-02-14 1995-08-16 Imagine Ltd. Vorrichtung und Verfahren zur Mustererzeugung auf einem dielektrischen Substrat
US8267572B2 (en) 2004-08-23 2012-09-18 ETH-Zurich Institut fur Lebensmittelwissenschaft, Laboratorium fur Lebensmittelverfahren-Stechnik ETH-Zentrum/LFO Method for gentle mechanical generation of finely dispersed micro-/nano-emulsions with narrow particle size distribution and device for carrying out said method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4977416A (en) * 1989-09-21 1990-12-11 Rastergraphics, Inc. Integrated thick film electrostatic writing head

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999260A (en) * 1961-07-26 1965-07-21 Rank Xerox Ltd Electrostatic printer
US3348232A (en) * 1962-09-05 1967-10-17 Xerox Corp Asynchronous page-at-a-time printer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999620A (en) * 1960-07-05 1965-07-28 Mullard Ltd Microwave direction-finding apparatus
US4443292A (en) * 1981-05-04 1984-04-17 Honeywell Information Systems Inc. Wear resistant electrode head for electrographic printers
US4534814A (en) * 1983-07-05 1985-08-13 Dynamics Research Corporation Large-scale printhead for non-impact printer and method of manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999260A (en) * 1961-07-26 1965-07-21 Rank Xerox Ltd Electrostatic printer
US3348232A (en) * 1962-09-05 1967-10-17 Xerox Corp Asynchronous page-at-a-time printer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667565A2 (de) * 1994-02-14 1995-08-16 Imagine Ltd. Vorrichtung und Verfahren zur Mustererzeugung auf einem dielektrischen Substrat
EP0667565A3 (de) * 1994-02-14 1996-04-10 Imagine Ltd Vorrichtung und Verfahren zur Mustererzeugung auf einem dielektrischen Substrat.
US8267572B2 (en) 2004-08-23 2012-09-18 ETH-Zurich Institut fur Lebensmittelwissenschaft, Laboratorium fur Lebensmittelverfahren-Stechnik ETH-Zentrum/LFO Method for gentle mechanical generation of finely dispersed micro-/nano-emulsions with narrow particle size distribution and device for carrying out said method

Also Published As

Publication number Publication date
EP0221453B1 (de) 1990-05-09
US4689643A (en) 1987-08-25
FR2589274B1 (fr) 1987-12-11
DE3670984D1 (de) 1990-06-13
FR2589274A1 (fr) 1987-04-30

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