PURPOSE: To make high speed printing possible with a simple mechanism and without requiring large electric power, by synchronously moving a plurality of printing heads and applying thereto switched electric power to drive arbitrary dots commonly.

CONSTITUTION: For example in a case of an ECR impact dot printer, a receipt printing head 1 and a journal printing head 2 are attached to a common printing head carrier 3, and they are are moved along a guide shaft 4 by rotation of a head feeding cam shaft 5. Outputs of the receipt printing head 1 and the journal printing head 2 are connected through a base plate 6 and a flat cable 9 to a printing head driving circuit. When a printing signal of H is applied to an input terminal 28, an electric current flows at the same time through magnet coils of the same pin number of the receipt printing head 21 and the journal printing head 22.