EP 0490643 B1 19950719 - Impact printers.
Title (en)
Impact printers.
Title (de)
Anschlagdrucker.
Title (fr)
Imprimantes à impact.
Publication
Application
Priority
US 62556990 A 19901211
Abstract (en)
[origin: EP0490643A2] An impact printer (10) includinges a platen (18), a carriage (32) mounted for reciprocating movement generally parallel to the platen, a rotatable print element (50) having character imprinting portions disposed thereon, the characters being assigned a class designation according to their imprinting area, a print element selector for moving the print element to position a selected character portion at a printing position, a hammer (82) for driving the character portions to deform the platen, and means for driving the hammer toward and away from the platen. Different impact speeds are assigned to the hammer in accordance with the character portion class designations. The rate of hammer displacement is varied as it is moved from a home position to an impact position so that the hammer initially moves through a first region at an increasing speed and subsequently moves through a second region at a substantially-constant speed. A counter is incremented periodically in response to the hammer movement for determining the instantaneous location and speed of the hammer, and the counter is reset with a predetermined count, notwithstanding the actual count, at a location within the second region. <IMAGE>
IPC 1-7
IPC 8 full level
B41J 9/48 (2006.01); B41J 2/30 (2006.01); B41J 9/44 (2006.01)
CPC (source: EP)
B41J 9/44 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0490643 A2 19920617; EP 0490643 A3 19921021; EP 0490643 B1 19950719; CA 2051571 A1 19920612; DE 69111395 D1 19950824; DE 69111395 T2 19960321; JP H04292965 A 19921016; JP H0798405 B2 19951025
DOCDB simple family (application)
EP 91311480 A 19911210; CA 2051571 A 19910917; DE 69111395 T 19911210; JP 32347891 A 19911207