34 to 34 63 34 each time the image signals data of a block are released from the shift register 15 a decoder 19 with 6 input lines and 64 output lines for decoding the binary count of the counter 18 activates the switching elements s1 s64 in succession corresponding to the count of the counter 18 now the function of the led printer shown in fig4 will be explained further in relation to the timing chart shown in fig5 wherein the parenthesized numbers 12 14 and 10 1 10 6 attached to curves a to i correspond to the number of the input terminals and signal lines shown in fig4 at first at a timing ta corresponding to the start of a period signal video enable supplied from the terminal 14 curve a in fig5 and also to the end of a clock pulse clk supplied from the terminal 13 curve b in fig5 the serial image signals data entered from the terminal 12 from the 1st to 64th pixels are supplied to the first shift register 15 more specifically said clock pulses clk are transmitted by the output control unit 17 as signal clk a curve d in fig5 to the shift register 15 through a signal line 10 1 whereby the signals of the first 64 pixels alone curve c in fig5 are stored in said shift register 15 in synchronization with the end of said clock signals clk a at a next timing tb succeeding 64 bits of the serial image signals data from 65th to 128th pixels entered from the terminal 12 are stored in the.