Printing timing detector for printer

Abstract

Abstract PURPOSE:To overcome the defect of an optical detector that detection becomes impossible when contaminants are accumulated, by a method wherein the passage of a body to be printed thereon between a drum and a press roller pressed against it is detected by an oscillation of the press roller. CONSTITUTION:When the drum 11 is rotated and the leading end of a card 2 supplied onto the drum 11 comes to a position of the press roller 30, the roller 30 is lifted up by an amount corresponding to the thickness of the card 2, and the card 2 is passed between the press roller 30 and the drum 11. Although the movement of the roller 30 at this moment is extremely small, the minute movement is amplified by an oscillatable arm 31 so that the movement of a slit 33 provided at a tip part of the arm 31 becomes large enough to be visually detected. The movement of the slit 33 is detected by a light-receiving element 35, whereby the position of the tip of the card 2 is recognized.

Inventors

• 👤 Hidekazu Kato
• 👤 英和 加藤
• 👤 Yutaka Uchida
• 👤 打田　裕

Bibliographic Details