Abstract: A copying machine including a cassette for storing a plurality of paper sheets P. The cassette is inserted into, or removed from, the copying machine through a front side. A paper-empty detecting unit detects the presence or the absence of paper sheets in the cassette. The paper-empty detecting unit comprises a detecting device and a moving device for moving the detecting device. The moving device moves the detecting device in response to the insertion or removal of the cassette. When the cassette is being inserted into or removed from the copying machine, the detecting device is moved out of the way by the moving device. After the cassette is inserted into the copying machine, the detecting device is moved to a detecting position at which the point of the detecting device abuts the paper sheet in the cassette.

Abstract: A developing-unit shifting apparatus has a photoconductive drum. A latent image corresponding to an original image is formed on the drum, and is developed by means of a first or second developing unit. These developing units are supported so that they can be associated with and disengaged from the drum. In the beginning of the copying operation, the first or second developing unit is affected so as to engage the drum. At the end of the copying operation, both these developing units are separated from the drum.

Abstract: An erasing array for erasing an image on a photosensitive drum of a copying machine includes an auxiliary printed board. A surface of the auxiliary printed board opposes a surface of the photosensitive drum. A plurality of LED chips are directly bonded, at a predetermined pitch, to the surface of the auxiliary printed board. The surface of the auxiliary printed board is covered by a casing which independently covers the plurality of LED chips. The casing includes a plurality of window holes for guiding light emitted from the LED chips onto the photosensitive drum. Gaps are respectively formed between the window holes and the LED chips. Parts such as a lens are not arranged in the gaps. A dustproof film is adhered to the casing, to prevent dust from entering the case through the window holes. The film covers the window holes and transmits therethrough the light emitted from the LED chips.