Apparatus for adjusting gap of platen

Abstract

Abstract PURPOSE:To prevent the damage of a printing head and paper, by connecting a mount stand having a printing head fixed thereto to a freely reversibly rotatable rotary drive part to mount a carrier in the direction crossing a platen at right angles in a freely movable manner and fixing the pressure-sensitive sensor contacted with paper to the mount stand. CONSTITUTION:When paper 18 is set to a platen 1 and a power source is closed, if the interval between a printing head 5 and the paper 18 is large, a motor 10 positively rotates to allow a mount stand 7 to advance to the side of the platen 1 and, when the pressure received from the paper 18 by a pressure-sensitive sensor 6 reaches a definite value, the motor 10 stops and, when said sensor received pressure equal to or more than the definite value, the motor 10 is reversed to retract the mount stand 7 from the platen 1. Therefore, the gap between the printing head 5 and the platen 1 can be automatically adjusted corresponding to the thickness of the paper 18. Because the pressure-sensitive sensor 6 is wider than the width of th leading end of the printing head 5, the thickness of the paper 18 is detected at the point of time slightly before the printing head 5 passes above the paper 18. Further, the motor 10 prevents the retraction of the mount stand 7 against printing pressure. As a result, even when printing is applied to a paper such as a passbok, the platen 1 can be sensitively retracted along the fold of the passbook.

Inventors

• 👤 Kiyoshi Morino
• 👤 森野　清

Bibliographic Details