Abstract: A control system for a line scanning type output unit which is made capable of generating both facsimile and text by setting the scanning density in the sub scanning direction at a higher value, but within the allowable error range, to match both the scanning density of the facsimile and the pitch of the text, by providing two types of clocks for composing image signals, i.e. a fax clock which matches with the resolution in the main direction of the facsimile and a text clock which matches with the pitch of the main scanning direction of the text, so that the fax clock may be employed to compose an image signal which is fed to the output unit for facsimile output and the text clock may be employed to compose image signal which is fed to the output unit for text output.

Abstract: A dot-type printer has heretofore been unable to output characters of the pitch which does not coincide with multiples of the dot-width by integers when such dot-width is either electrically or mechanically fixed, causing considerable errors and not being in compliance with the recommendation of CCITT. The system according to the present invention provides a means to obtain the distance between a character and a printing reference point and to output the character at a position which is separated from the reference point by the distance in a multiple of the dot-width by an integer and which is either immediately before or after the point of the distance thus obtained. By such output control, the character outputted can remain within the range recommended by CCITT with only negligible errors.