Abstract: An ink ejecting device includes an ink ejecting member having an ink chamber and a nozzle at a specified position thereof; an ink ejecting driver for reducing the volume of the ink chamber to eject out ink from the ink chamber through the nozzle; and a controller connectable to an image data generator generating image data indicative of a plurality of densities for controlling the ink ejecting driver to regulate the volume reduction of the ink ejecting chamber in accordance with image data. Ink is ejected at an amount corresponding to image data indicative of a density. An image having a gradation can be printed at a high speed accurately and clearly with a simplified construction.

Abstract: An ink ejecting device for use in an ink jet printing apparatus, includes: a number of ejecting elements arranged in a matrix having a first number of columns and a second number of rows, each ejecting element having: an ink chamber whose volume is changeable, an ejection nozzle communicating with the ink chamber, and an ink supply hole communicating with the ink chamber, and an piezoelectric conversion element, a drive portion for driving piezoelectric conversion elements of each column in a manner for expanding the ink chamber to allow ink to flow into the ink chamber and contracting the ink chamber to eject ink from the ink chamber through the ejection nozzle.

Abstract: An image reading device includes a photoelectric conversion array of a number of photoelectric conversion elements arranged in a first direction; and a scanner which scans photoelectric conversion elements in the first direction, the scanner having: a first scanning mode of scanning respective photoelectric conversion elements of two or more primary regions defined in the photoelectric conversion array in parallel; and a second scanning mode of scanning respective photoelectric conversion elements of two or more secondary regions defined in a particular primary region in parallel, and a switch which switches over the first and second scanning modes.

Abstract: An image forming apparatus includes a document size detection device, a copy paper feeder carrying a plurality of copy paper sheets having different sizes, a copying device for copying an image of the document onto the fed copy paper sheet, the copying means having a copy magnification changer, a copy paper size selector for selecting a desired copy paper size from the plurality of copy paper sizes, a copy magnification setting device for setting a desired copy magnification, a copy mode selection device for selecting either a manual mode or an automatic mode, and a controller for controlling the copy paper feeder and the copy magnification changer so as to execute the manual mode, the automatic mode. The automatic mode has an automatic document size priority sub-mode and an automatic copy paper size priority sub-mode which are changed by actuating the copy paper size selector.

Abstract: A composite image forming apparatus including an analog or a digital image forming apparatus of the type in which an optical system moves relative to a document placed on a document table, the image on the document is scanned by the optical system and the image is transferred to a sheet of image transferring paper and a belt like recording medium on which additional or optional images from which additional or optional images other than the document image can be transferred to the sheet of image transferring paper.

Abstract: A multicolor image forming apparatus having a plurality of developing units respectively containing different color developers; comprising a newly selected developing unit switching timing controller for controlling the rotation of the photoreceptor and the timing for switching of the newly selected developing unit, or a previously selected developing unit switching timing controller for controlling the rotation of the photoreceptor and the switching timing of the previously selected developing unit.

Abstract: A developing device includes a developing section provided with an applicator for applying a developer to a latent electrostatic image and a supporting section for supporting the developing section turnably between an operating position at which the developer held on the applicator acts on image-bearing member and a non-operating position at which the developer held on the applicator does not substantially act on the image-bearing member. According to a first aspect, positioning device acts on the developing section and holds it at the operating position. According to a second aspect, there is provided device for holding the developing section at the non-operating position at the time of mounting a main body of the developing device on an image-forming machine. According to a third aspect, when the main body of the developing device is mounted on the image-forming machine, electrical connecters provided thereon are electrically coupled to each other.

Abstract: A developing device includes a developing section provided with an applicator for applying a developer to a latent electrostatic image and a supporting section for supporting the developing section turnably between an operating position at which the developer held on the applicator acts on image-bearing member and a non-operating position at which the developer held on the applicator does not substantially act on the image-bearing member. According to a first aspect, positioning device acts on the developing section and holds it at the operating position. According to a second aspect, there is provided device for holding the developing section at the non-operating position at the time of mounting a main body of the developing device on an image-forming machine. According to a third aspect, when the main body of the developing device is mounted on the image-forming machine, electrical connecters provided thereon are electrically coupled to each other.