EP0288027A1 - Tête d'impression par jet d'encre - Google Patents

Tête d'impression par jet d'encre Download PDF

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Publication number
EP0288027A1
EP0288027A1 EP88106295A EP88106295A EP0288027A1 EP 0288027 A1 EP0288027 A1 EP 0288027A1 EP 88106295 A EP88106295 A EP 88106295A EP 88106295 A EP88106295 A EP 88106295A EP 0288027 A1 EP0288027 A1 EP 0288027A1
Authority
EP
European Patent Office
Prior art keywords
jet
nozzle
ink jet
deflection unit
nozzle axis
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
EP88106295A
Other languages
German (de)
English (en)
Other versions
EP0288027B1 (fr
Inventor
Gerhard Gloeckler
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.)
Codi-Jet Markierungs Systeme GmbH
Original Assignee
Codi-Jet Markierungs Systeme 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 Codi-Jet Markierungs Systeme GmbH filed Critical Codi-Jet Markierungs Systeme GmbH
Priority to AT88106295T priority Critical patent/ATE65965T1/de
Publication of EP0288027A1 publication Critical patent/EP0288027A1/fr
Application granted granted Critical
Publication of EP0288027B1 publication Critical patent/EP0288027B1/fr
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
    • B41J2/005—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
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers
    • 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
    • B41J2/135—Nozzles
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16505—Caps, spittoons or covers for cleaning or preventing drying out
    • 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
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers
    • B41J2002/1853—Ink-collectors; Ink-catchers ink collectors for continuous Inkjet printers, e.g. gutters, mist suction means

Definitions

  • the invention relates to a continuously operating ink jet writing head with a jet generator, a jet deflection unit and a catch tube arranged in the nozzle axis for receiving the undeflected ink jet, the catch tube being fastened on a carrier which is guided parallel to the nozzle axis and can be moved by a drive to be movable along the nozzle axis between its working position and a rest position in which it tightly encloses the mouth region of the jet nozzle, and at least parts of the jet deflection unit being movably mounted transversely to the nozzle axis.
  • Such continuously operated print heads - in which the jet generation is not interrupted during normal, brief write interruptions between characters, broken lines, etc., but the undeflected ink jet hits a collecting tube - are mainly used with ultra-fast drying inks, because with them a constantly alternately starting and stopping the jet would be associated with particular difficulties.
  • the shutdown and commissioning of the writing instrument in that the nozzle and collecting tube together with the return line tend to dry out and manual operations with the use of solvents are required to make the device available again.
  • Such a device is known for example from US-A-4,160,982.
  • the device shown there has the particular disadvantage that failure to remove the beam deflection unit from the linear movement of the collecting tube leads to damage to one part or the other.
  • catch tube or its slide is moved here by means of a toothed rack, which experience has shown requires a large overall length of the entire device.
  • the aim of the present invention is to increase the availability of the device and to avoid annoying and lengthy cleaning manipulations by automated shutdown and commissioning of the write head.
  • the device should be as small as possible and foolproof.
  • these parts of the beam deflection unit are positively coupled to the movable carrier in order to keep the path of movement of the collecting tube and / or the carrier clear.
  • This positive coupling has the great advantage that the deflection unit is always removed from the trajectory of the collecting tube when this is necessary, i. H. when the trajectory crosses the position of the beam deflection unit.
  • a very simple exemplary embodiment provides a push crank with which the beam deflection unit and the movable carrier are coupled. This simple mechanical design is absolutely foolproof and less prone to wear.
  • the slide movement is preferably generated by means of a threaded spindle.
  • annular seal is provided at the mouth area of the jet nozzle, which in turn serves to achieve a leak-proof collecting tube connection.
  • the illustrated inkjet write head has a base plate 1 with a jet generator 2 of a known type mounted thereon. This is assigned a jet nozzle 3, which is integrated in a nozzle plate 5. This nozzle plate 5 is adjustable on the base plate 1 in order to align the jet nozzle 3 in a manner not shown. As indicated schematically with the direction of the arrow x in FIG. 1, writing ink is fed to the jet generator 2 and a continuous writing jet 7 is generated, which is broken down into fine droplets in a known manner. If the jet 7 is not deflected on its flight, it runs in the direction of the nozzle axis 4.
  • a deflection unit 10 for the ink jet 7 is mounted on a swivel plate 11, which is connected to the base plate 1 via a hinge axis 12.
  • the deflection unit contains a charging electrode 13 and a pair of plate-shaped deflection plates 16, which are each held by a base 15.
  • the ink jet 7 experiences a defined electrostatic charge in a narrow slot 14 (FIG. 2) of the charging electrode 13, and in the space between the baffle plates 16 it is charged in the direction of the plate distance (perpendicular to the plane of the drawing in FIG . 1) deflected.
  • the deflection unit 10 (seen from the jet nozzle 3) there is a catch tube 20 for the undeflected ink jet 7.
  • the ink jet 7 On its open mouth 20 refinement the ink jet 7 is aligned so that the undeflected jet is received by the catch tube 20 and via an ink -Return 20 ⁇ is returned to the device.
  • the ink jet 7 only reaches the object (not shown) to be labeled when it is deflected between the plates 16.
  • the two rods 22, 22 ⁇ start from the base plate 1 or a flange 26 connected to it, that is, they are fixed with respect to the jet nozzle 3.
  • With the carriage 21 is also a threaded spindle 24 in engagement, which extends between the two rods 22, 22 ⁇ and can be driven by an electric motor 25 in both directions of rotation; the motor 25 is also fastened to the base plate 1 with the aid of the flange 26.
  • the slide 21 with the collecting tube 20 can thus be moved back and forth parallel to the nozzle axis 4 between two end positions.
  • One of these end positions corresponds to the working position according to FIG. 1, while the other end position - the rest position when the writing instrument is switched off - is shown in FIG. 4.
  • the catch tube 20 engages in a plate 6 in order to tightly enclose the mouth region of the jet nozzle 3 (without, however, blocking the nozzle bore itself).
  • an O-ring seal 6platte is arranged between the plate 6 and the nozzle plate 5, which seal 6 ⁇ surrounds the nozzle axis 4 and is matched to the diameter of the collecting tube 20.
  • the deflection unit 10 Since the deflection unit 10 as a whole can be swiveled out about the axis 12, it is movably mounted transversely to the nozzle axis 4.
  • the transverse movement of the deflection unit 10 is expediently coupled to the travel movement of the slide 21, here by means of a push crank 28, which on the one hand by means of bolts 27, 29 with the slide 21 mentioned and on the other hand is articulated to one of the bases 15.
  • the deflection unit 10 is automatically pivoted out in accordance with the travel movements of the carriage 21 (see rest position according to FIG. 4), so that a collision is impossible.
  • the charging electrode could be composed of two halves, which can be moved apart to expand the slot to expand the passage to enable the catch tube.
  • other types of forced coupling or coordinated movement of the parts are of course conceivable, for example by means of cams or the like.
  • the motor 25 is switched on with the switch-off command and the collecting tube 20 is moved towards the nozzle.
  • the jet generator and the ink return are still kept in operation during the travel movement and thus the jet 7 is continuously taken up by the collecting tube 20, so that the system does not dry out undesirably.
  • the motor 25 and the ink system switched off. Since the system is now tightly sealed between the nozzle and the collecting tube, ink can neither leak nor dry out.
  • the jet generator and then the motor 25 are switched on in order to bring the write head into the operating position according to FIG.
EP88106295A 1987-04-24 1988-04-20 Tête d'impression par jet d'encre Expired - Lifetime EP0288027B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88106295T ATE65965T1 (de) 1987-04-24 1988-04-20 Tintenstrahl-schreibkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH158487 1987-04-24
CH1584/87 1987-04-24

Publications (2)

Publication Number Publication Date
EP0288027A1 true EP0288027A1 (fr) 1988-10-26
EP0288027B1 EP0288027B1 (fr) 1991-08-07

Family

ID=4213827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106295A Expired - Lifetime EP0288027B1 (fr) 1987-04-24 1988-04-20 Tête d'impression par jet d'encre

Country Status (3)

Country Link
EP (1) EP0288027B1 (fr)
AT (1) ATE65965T1 (fr)
DE (1) DE3864061D1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839721A (en) * 1973-06-27 1974-10-01 Ibm Device for retention of ink jet nozzle clogging and ink spraying
US4160982A (en) * 1978-03-24 1979-07-10 A. B. Dick Company Anti-dispersion accumulator for ink jet printing system
US4626869A (en) * 1985-04-12 1986-12-02 Eastman Kodak Company Ink jet wet-storage system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839721A (en) * 1973-06-27 1974-10-01 Ibm Device for retention of ink jet nozzle clogging and ink spraying
US4160982A (en) * 1978-03-24 1979-07-10 A. B. Dick Company Anti-dispersion accumulator for ink jet printing system
US4626869A (en) * 1985-04-12 1986-12-02 Eastman Kodak Company Ink jet wet-storage system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 49, Seite 143 M 7; & JP-A-55 019 557 (RICOH K.K.) 12-02-1980 *

Also Published As

Publication number Publication date
ATE65965T1 (de) 1991-08-15
DE3864061D1 (de) 1991-09-12
EP0288027B1 (fr) 1991-08-07

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