Abstract: According to the present printing apparatus, in case that print processing of a preceding job to a particular job has not ended yet when a control section is to start input processing of that particular job, the control section waits until the print processing of the preceding job ends and sets a print-inhibiting time for inhibiting parallel print processing to handle interruption processing in a period between an end of the print processing of the preceding job and a start of the input processing of that particular job. Then, the control section waits until the print-inhibiting time ends and starts the input processing of that particular job, and then starts print processing of that particular job.

Abstract: The invention provides a stackless continuous dual-sided copying method in photocopying machines.

Abstract: An image forming apparatus has an imaging portion; a sheet storage portion including a sheet support member on which a stack of copy sheets are placed, the sheet support member being movable between a sheet replenishing position where copy sheets are replenished and a sheet dispense position where copy sheets are dispensed to the imaging portion one by one; a detector which detects the presence of the sheet support member at the sheet dispense position; a instructing portion which instructs an imaging operation to the imaging portion; and a controller which holds the instruction of imaging operation during a movement of the sheet support member from the sheet replenishing position to the sheet dispense position after receiving the instruction until the sensor detects that the sheet support member has reached the sheet dispense position and which controls the imaging portion to start the imaging operation upon the sensor detecting that the sheet support member has reached the sheet dispense position.