Method and arrangement for protecting sheets from charring in copying machines

摘要

In an electro-photographic copier of the type wherein an image is formed on an image-carrying sheet and is thereafter fixed by subjecting the sheet at a fixing station to the influence of heat, a combination comprises a heating arrangement at the fixing station for fixing an image on a sheet, and a conveyor arrangement for advancing the sheet through the station at a predetermined speed sufficient to permit the heating arrangement to fix the image on the sheet. An automatic de-actuating timing switch is employed to prevent charring of the sheet in the event that the latter is advanced through the fixing station at a speed lower than said predetermined speed.