PURPOSE: To achieve improvement of efficiency in use of a common transmission path by limitting occupancy of the common transmission oath only when an image data is read from an image forming device by a method wherein a storage means of the image data is integrated into a printer.
CONSTITUTION: A common transmission path S150 is connected to a control part in a printer B by a switching means 108, and is connected to a buffer means 104 by a switching means 109. A switching means 136 is connected to a line memory 161, and a switching means 137 is connected to a line memory 160. A bit map data S100 is written in the line memory 161 in synchronization with a clock 105 from a host computer 120 via the common transmission path S150 and at the same time a preliminarily written bit map data is read as S100' from the line memory 160 in synchronization with the clock 105. An occupancy period of the common transmission path S150 is steeply lightened.
TORISAWA AKIRA
OTAKE MASAKI
ITO YASUO
UENO FUMIHIRO
