EP 0204773 A4 19890426 - APPARATUS FOR MONITORING AND ADJUSTING LIQUID JETS IN INK JET PRINTERS.
Title (en)
APPARATUS FOR MONITORING AND ADJUSTING LIQUID JETS IN INK JET PRINTERS.
Title (de)
VORRICHTUNG ZUR REGELUNG DER GESPRITZTEN MENGE IN TINTENSTRAHLDRUCKVORRICHTUNG.
Title (fr)
APPAREIL DE CONTROLE ET DE REGLAGE DE JETS DE LIQUIDE DANS DES IMPRIMANTES A JET D'ENCRE.
Publication
Application
Priority
AU PG841684 A 19841205
Abstract (en)
[origin: WO8603457A1] The production of uniform droplets (5) in ink jet printers is effected by introducing a periodic variscosity into the liquid stream (3) which leaves each jet body (2) of the printer. Effective printing with these droplets (5) requires the correct synchronism between breakoff of droplets from the liquid stream and the application of a charge to the droplets, via a charging electrode (4). To enable compensation to be made to ensure this synchronism remains correct, despite variations in the properties of the printing liquid, droplets from one printing jet (monitor jet) are monitored. Whenever the monitor jet observation shows that the synchronism has varied, a correction signal (ADV, RTD) is generated to cause the application of variscosity, or the application of charge, to be altered to compensate for the drift in synchronism. A preferred monitor jet construction includes a collector (6) for charged droplets, which receives droplets (5) from the monitor jet and periodically discharges collected liquid (7). A sense amplifier (11) is responsive to the net charge on the collector (6), and the signal from the sense amplifier (11) is used to generate the correction signal.
IPC 1-7
IPC 8 full level
B41J 2/17 (2006.01); B41J 2/015 (2006.01); B41J 2/115 (2006.01); B41J 2/175 (2006.01)
CPC (source: EP)
B41J 2/115 (2013.01)
Citation (search report)
- [A] US 4016571 A 19770405 - YAMADA TAKAHIRO
- See references of WO 8603457A1
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL
DOCDB simple family (publication)
WO 8603457 A1 19860619; AU 5089085 A 19860612; AU 594031 B2 19900301; EP 0204773 A1 19861217; EP 0204773 A4 19890426; HU T40365 A 19861228; JP S62501278 A 19870521
DOCDB simple family (application)
AU 8500307 W 19851205; AU 5089085 A 19851205; EP 86900018 A 19851205; HU 94185 D 19851205; JP 50015386 A 19851205