Global Patent Index - EP 0189798 A1

EP 0189798 A1 19860806 - Method for controlling the paper-feeding in a printing device.

Title (en)

Method for controlling the paper-feeding in a printing device.

Title (de)

Verfahren zur Steuerung des Papiervorschubs in einer Druckeinrichtung.

Title (fr)

Procédé pour contrÔler l'alimentation du papier dans un dispositif à imprimer.

Publication

EP 0189798 A1 19860806 (DE)

Application

EP 86100587 A 19860117

Priority

DE 3502761 A 19850128

Abstract (en)

1. Method of controlling the paper feeding in a printing device, in which the paper web (3) is introduced by means of a feeding device into the paper guide channel of a platen (6) and, after partially wrapping round this platen (6), is led past a print head (7), transported up to a feeling element (9), sensing the leading edge of the paper, and subsequently aligned with the first print line in a backward movement, using a microprocessor-controlled stepping motor drive for the platen (6), characterized in that, starting from a beginning of the paper web placed in the feed tractors (5) at any point, the paper web (3) is transported with full-line feed up to the feeling element (9), in that, after signalling of the leading edge of the paper by the feeling element (9), the feed is switched with at least a half-line increment in backwards direction and subsequently again in fractions of halfline increments in forwards direction until the renewed signalling of the leading edge of the paper by the feeling element (9), the full-line increment or the fraction of a half-line increment just begun in each case being ended after the signalling of the leading edge of the paper by the feeling element (9), and in that subsequently the paper web (3) is transported back, with respect to the predetermined distance between feeling element (9) and print head (7), in as many increments as it takes until the print head is aligned with the first print line precisely to the fraction of a half-line increment.

Abstract (de)

Ausgehend von einer mit einer Randlochung versehenen Endlospapierbahn (3), die an, beliebiger Stelle in die Vorschubraupen (5) eingelegt werden kann, erfolgt zunächst ein Ganzzeilenvorschub bis zu einem nach dem Druckkopf (7) angeordneten, die Papierbahnvorderkante abtastenden Federelement (9). Nach Signalisierung der Papiervorderkante durch das Fühlelement (9) wird der Vorschub mit wenigstens einem Halbzeilenschritt in Rückwärtsrichtung und anschließend wieder in Bruchzeilen von Halbzeilenschritten in Vorwärtsrichtung bis zur erneuten Signalisierung der Papiervorderkante durch das Fühlelement (9) geschaltet. Schließlich wird die Papierbahn (3), bezogen auf den fest vorgegebenen Abstand zwischen Fühlelement (9) und Druckkopf (7), in so vielen Schritten zurücktransportiert, bis der Druckkopf (7) auf die erste Druckzeile ausgerichtet ist.

IPC 1-7

B41J 11/42; G06K 15/16; B41J 13/28

IPC 8 full level

B41J 11/42 (2006.01); B41J 13/28 (2006.01); B41J 29/44 (2006.01); G06K 15/16 (2006.01)

CPC (source: EP)

B41J 11/42 (2013.01); B41J 13/28 (2013.01); B41J 29/44 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI NL SE

DOCDB simple family (publication)

EP 0189798 A1 19860806; EP 0189798 B1 19890802; AT E45121 T1 19890815; DE 3664745 D1 19890907

DOCDB simple family (application)

EP 86100587 A 19860117; AT 86100587 T 19860117; DE 3664745 T 19860117