PRINTER CONTROLLER

PURPOSE:To decelerate printing speed, to reduce current value to be applied to a printing head, and to avoid an increase in size of power source by providing a printer controller for controlling the printing speed of a printer with a signal from a printer speed controller, and a printer power source for controlling the amplitude of a power source current by the same signal. CONSTITUTION:A detection signal of a solid black detector 4 is transmitted to a logic AND gate 6 and a number-of-row counter 5, the counter 5 counts the number of rows to be output from the detector 4, and when it arrives at the designed counted value, it outputs a signal. The gate 6 outputs a signal that original data to be printed on a printer speed controller 7 is black solid original data. The controller 7 instructs a printer controller 8 to decelerate the printing speed to, for example, half of its normal value and to simultaneously reduce a current value to be applied to a printing head to half. Thereafter, the original data is output to a printer 10. As a result, the power of the printer can be inexpensively manufactured in small size.