Abstract: A printing apparatus used in a computer system selects either one of a plurality of paper feed cassettes and prints image data onto a cut sheet supplied from the selected cassette. Paper sensors are individually attached at predetermined positions which are located just after a plurality of paper feed cassettes at the same distance. The paper conveying times from the attaching positions of the paper sensors to a print start request position have been preset. When the cassette is switched during the printing operation, the predetermined paper feed timing time is changed. When switching from the cassette at a near position to the cassette at a remote position, the paper feed timing time is set to a short time and the paper feeding operation from the cassette on the switching side is instructed.

Abstract: The image forming device of this invention is related to a device such as a duplicator, a printer, a facsimile or the like in which a printing operation is carried out by utilizing an electrophotographic recording system and an electrostatic recording system, wherein the device includes a plurality of consumable working parts including at least a developing unit, a drum unit, a fixing unit, and a transfer unit, and the device further includes a unit for integrating the working time of each of the working parts, a memory for storing the integrated working time of each working part, a lifetime setting unit in which a predetermined lifetime of each working part is set, and a generator for generating an exchange requirement signal for at least one of the working parts when the integrated working time of the working part reaches the lifetime of the part set in the lifetime setting unit, whereby an image forming device having a system in which these consumable working parts can be exchanged at correct intervals, re

Abstract: A method of controlling a fuser unit of an image-forming apparatus such as a laser printer, in a warming-up stage, so that excess mechanical and electrostatic stresses are not imposed on the process elements.