EP 0453472 B1 19930915 - PROCESS FOR CONTROLLING THE OPERATION OF A PRINTING HEAD
Title (en)
PROCESS FOR CONTROLLING THE OPERATION OF A PRINTING HEAD
Publication
Application
Priority
DE 3900765 A 19890112
Abstract (en)
[origin: WO9008039A1] A process for controlling the operation of a printing head detects defects in the transport of the printing head along a printed line and if necessary corrects them. A control unit (24) controls a current source (16) which supplies current to a transport motor (12) which moves the printing head (10). The printing elements (14) of the printing head (10) are supplied with pulsed drive current (ID) by a driver component (18). A position indicator (20) records the distance travelled by the printing head (10) along a printed line. According to the invention, the transport time between two printing positions is monitored to detect whether a limit value (G) is exceeded. If the limit value (G) is exceeded, the drive of the printing head (10) is stopped and if necessary the printing head is moved in the opposite direction and/or at least one printing element (14, 15) is operated with less energy that that required for printing. As a result of these measures, a defect due to adhesion of a printing element (14) to a printing ribbon can be detected and eliminated automatically.
IPC 1-7
IPC 8 full level
B41J 19/18 (2006.01); B41J 2/30 (2006.01); B41J 2/51 (2006.01); B41J 19/20 (2006.01); B41J 29/38 (2006.01); B41J 29/46 (2006.01)
CPC (source: EP KR US)
B41J 19/20 (2013.01 - KR); B41J 19/202 (2013.01 - EP US); B41J 29/38 (2013.01 - EP US)
Citation (examination)
DE 3021029 A1 19801211 - CANON KK
Designated contracting state (EPC)
DE ES FR GB IT NL SE
DOCDB simple family (publication)
WO 9008039 A1 19900726; DD 291512 A5 19910704; DE 3900765 A1 19900719; DE 3900765 C2 19901018; DE 59002754 D1 19931021; EP 0453472 A1 19911030; EP 0453472 B1 19930915; ES 2043357 T3 19931216; JP 2573422 B2 19970122; JP H03505712 A 19911212; KR 910700151 A 19910314; KR 950010444 B1 19950918; US 5219233 A 19930615
DOCDB simple family (application)
EP 9000056 W 19900110; DD 33707090 A 19900112; DE 3900765 A 19890112; DE 59002754 T 19900110; EP 90901786 A 19900110; ES 90901786 T 19900110; JP 50200890 A 19900110; KR 900702016 A 19900912; US 73087591 A 19910911