Bilderzeugungsgerät.

摘要

An image forming apparatus comprises a memory (25) containing code data, code data input keys (12) and a preheat changeover key (11) for selectively switching a fixing device (81) to a preheat mode or an operation ready mode, whereby the apparatus is permitted to operate when a code data manually entered through the code data input keys (12) is identical with one of the code data already stored in the memory. The image forming apparatus further comprises entered code data release means adapted to be associated with the operation of the preheat changeover key (11) for switching the fixing device (81) to the preheat mode, so that the apparatus is brought to the state which prevailed before the code data is entered and where the apparatus is inhibited from operating. When the preheat key (11) is pressed, the apparatus is switched to the preheat mode and, at the same time, the entered code data is released. Accordingly, the apparatus requires no dedicated button or key for releasing the entered code data, and may put to practical use the preheat changeover means (11) which has been conventionally provided.