Printing pressure controlling method

Abstract

Abstract PURPOSE:To allow the printing density to be adjusted to a desired value when a plurality of sheets of printing paper are laid one upon another and simultaneously printed, by installing a pressure-sensitive element at a predetermined position of a platen, detecting a printing pressure from a trial printing, and adjusting the force for driving a pin on a print head on the basis of the detected printing pressure. CONSTITUTION:In a dot printer wherein the position of a print head 12 can be adjusted such as to be close to or remote from a platen according to the number of sheets of printing paper which are laid one upon another and are simultaneously printed, a necessary number of piezoelectric elements 18 are buried in a platen 10 at predetermined positions, respectively. A desired number of sheets of printing paper are laid one upon another and placed on the platen 10 and are subjected to a trial printing in order to detect a printing pressure from a voltage generated by the piezoelectric elements 18 in the trial printing. The pulse width of the exciting voltage applied to a magnet for driving a pin on the print head 12 is adjusted such that the printing pressure is coincident with a desired value.

Inventors

• 👤 Mitsuru Sato
• 👤 満 佐藤

Bibliographic Details