PURPOSE:To drastically reduce the memory area by providing a left margin setting register and a right margin setting register. CONSTITUTION:In timing with a TOP signal indicating that the front end of a sheet to be printed out arrives at a print position, a top signal sensor circuit 21 outputs an ENABLE signal to a horizontal synchronizing signal detecting circuit 22. In timing with a horizontal synchronizing signal for line starting LSYN, the circuit 22 produces a signal LOAD for loading a left margin setting value to the left margin setting counter CT23. A left margin setting register 24 latches the setting value by write signal WT. The CT23 subtracts the loaded left margin setting value by the serial data shift lock VCLK. The output position of the serial data is shifted from the left end to the right end of the sheet for the value set at a count 24 of the CRT until the CT23 count value is equal to zero to realize the left margin. When the CT23 is equal to zero, a print operation start signal PRST is rendered active.
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