Abstract: A toner developing quantity detection unit operates a plurality of electrostatic recording units to transfer Y, M, C and K color component toner marks onto a belt. A toner developing quantity correction unit detects toner developing quantities per unit area of color toners on the basis of detection signals of the color component toner marks on the belt optically detected by a sensor. The toner developing quantity correction unit corrects the toner developing quantities so as to allow the toner consuming quantities of the plurality of electrostatic recording units to be substantially the same level, on the basis of the thus detected toner developing quantities.

Abstract: A printer comprises a cylindrical platen for supporting and feeding a printing sheet, a pinch roller in resilient contact with the platen to cooperate therewith to feed the cut sheet, and an inclined sheet guide on which a cut sheet is loaded. A leading edge of the cut sheet is inserted into a space between the platen and the pinch roller so that the cut sheet is ready to be compulsorily fed by the platen. When or after a cut sheet is loaded on the sheet guide, the platen is rotated in the reverse direction by a predetermined amount of rotation and then rotated in the forward direction to set the cut sheet at a given print start position. During the reverse rotation of the platen, the leading edge of the cut sheet is pushed up so that the posture of the cut sheet is corrected.