Abstract: After a photosensitive drum is cleaned of residual toner by a scraper blade, a lubricant film is applied to the drum to maintain the coefficient of friction between the drum and blade constant and thereby ensure efficient cleaning and printing density without damage to the drum. The film forming material is in the form of a block and is applied to the drum by a rotary brush. The brush is selectively moved into and out of engagement with the drum to control the amount of film application. The engagement of the brush with the drum is controlled in accordance with a sensed parameter such as a number of copies produced, the coefficient of friction between the drum and a sensor blade, etc.

Abstract: Character data is entered into a cathode ray tube display device from a keyboard or from a tape reader or the like selected by a key on the keyboard. The data is stored in a main memory inside the display device and simultaneously displayed on the cathode ray tube for composing and editing. An auxiliary memory is disposed between the display device and output devices such as tape punches so that data may transferred from the main memory of the display device into the auxiliary memory, and the data may be transferred from the auxiliary memory to the output devices while new data is being entered into the display device. Selected characters on the display, such as capitals, may be emphasized by displaying a dotted or solid line above or below the character or slanting the character. A cursor controlled by the keyboard is displayed on the cathode ray tube to indicate the position for entry or editing of data. Warning means are provide to give an indication when the cursor reaches the end of the display.