Abstract:
An apparatus including an illuminator to emit light on a media to be printed on is provided. The apparatus also includes an optical sensor disposed proximate to the illuminator to detect an amount of reflected light. In addition, the apparatus includes a processor to control the illuminator and the optical sensor. The processor is to calibrate the illuminator to determine a first brightness level for high sensitivity at the optical sensor. The processor is to calibrate the illuminator to determine a second brightness level iteratively based on a signal to noise ratio. The processor is to compare the second brightness level with the first brightness level to determine whether to proceed with detection of an edge of the media using the second brightness level.
Abstract:
Le dispositif combine un scanner opto-électronique avec un scanner mécanique l'un et l'autre agencés dans un canal de guidage de papier, entre l'auge de guidage de papier et le dispositif de transport. L'interconnexion logique des signaux émis par les deux scanners permet au dispositif de commande de savoir automatiquement et facilement si le support d'enregistrement introduit est une feuille simple de papier, un feuillet à perforation marginale ou une feuille transparente. Divers paramètres de fonctionnement de l'installation d'impression sont automatiquement adaptés pour le type de support d'enregistrement identifié au moyen du procédé précité.
Abstract:
According to the kind of paper sheet specified through an operation unit (111) by the user, the environmental temperature detected by a thermistor (110), and the spacing between the paper sheet and a paper sensor, detected by a lift height sensor (113), respectively, the correction values for the start and end positions where the printing heads start and end the printing in a horizontal direction are beforehand stored in a memory (112). Before printing, a CPU (104) detects the paper edge positions of the paper sheet on the basis of the output from a paper sensor (303), and reads the corresponding correction values from the memory (112) according to the kind of paper sheet, the environmental temperature and the lift height. A window control unit (106) corrects the paper edge position with the correction values, thereby generating a window signal which controls the side margins of the paper sheet. In accordance with the window signal, a head control unit (105) controls the heads (103) for the respective colors to precisely determine printable regions extending horizontally from the printing start positions to the printing end positions.