Abstract: An image processing device includes a scanner, which reads a plurality of images and inputs them as multivalue digital image data; a matching data producing section which, based on the inputted multivalue image data, produces matching data for joining the respective inputted images; a post-processing section, which binarizes the image data of each image inputted by the scanner; a joining section, which synthesizes the respective inputted images into a single image by joining the binary data produced by the post-processing section, which corresponds to the image data of the respective inputted images, on the basis of the matching data produced by the matching data producing section; and a printer for outputting the image joined by the joining section. Thus an image processing device can be provided which is capable of joining any type of image, whether from written characters, halftone dot, or photographic originals, and of performing this joining processing at high speed.

Abstract: An image processing portion for conducting the specified processing of an image to be reproduced by an image forming portion based on the processed image data is constructed as a single control portion. Consequently, the development of a variety of digital copying machines requires preparation of specially designated control boards according to levels of the products. This makes machines expensive and requires users to pay a considerable initial cost.

Abstract: An image processing portion for conducting the specified processing of an image to be reproduced by an image forming portion based on the processed image data is constructed as a single control portion. Consequently, the development of a variety of digital copying machines requires preparation of specially designated control boards according to levels of the products. This makes machines expensive and requires users to pay a considerable initial cost.

Abstract: An image processing portion for conducting the specified processing of an image to be reproduced by an image forming portion based on the processed image data is constructed as a single control portion. Consequently, the development of a variety of digital copying machines requires preparation of specially designated control boards according to levels of the products. This makes machines expensive and requires users to pay a considerable initial cost.

Abstract: A network system for copiers includes a plurality of copiers each provided with a communication device for communicating with external equipment and a power-on device for powering on the copier in a hold state in response to an external signal received by the communication device and a main controller including an operation controller for controlling operation of the copiers and a time setter for setting time to power on a copier, the main controller being connected to the copiers by a network. The operation controller executes control such that only predetermined one of the copiers is powered on at the power-on time set by the time setter.

Abstract: A copying machine which compares between the longitudinal dimension and the crosswise dimension of each line mark based on an output from the image information reading means and decides the coordinates of a longer line mark as the effective coordinates for the line mark, and determines an editing area based on the coordinates of each line mark decided so that the editing is performed on the image in the editing area in accordance with the preset marker editing mode.

Abstract: A sheet feeding device, includes a lift down sensor for detecting a rotating plate of a rotatable cassette lowered down to a planar position, a lift up sensor for detecting the rotating plate lifted up to a sheet feeding position, a lateral feed position detecting sensor for detecting the rotatable cassette situated in the lateral feeding position, a longitudinal feed position detecting sensor for detecting the rotatable cassette situated in the longitudinal feeding position, and control means for controlling the drive mechanisms of the sheet feeding device. In the rotating operation of the rotatable cassette, if the lift down sensor is not turned on, the rotating plate is lowered so as to turn on the lift down sensor, thereafter the rotatable cassette is rotated to the predetermined longitudinal or lateral feeding position, and after the lateral or longitudinal feed position detecting sensor is turned on, the rotating plate is lifted up until the lift up sensor is turned on.

Abstract: A sheet supplying device supplies a sheet to a sheet supplied apparatus which designates the size and transport direction of the sheet. The sheet supplying device includes a movable cassette for placing the sheet thereon and movable to at least two transport positions so as to transport the sheet therefrom in at least two transport directions, a fixed cassette for placing the sheet thereon and fixed in one transport position so as to transport the sheet therefrom in one transport direction, a transport device for transporting the sheet from each of the movable cassette and the fixed cassette to the sheet supplied apparatus.

Abstract: After a two-component developer with known toner concentration is poured into a tank and begins to be stirred, its toner density is measured quickly at least three times by a toner density sensor and the final value to which the output of this sensor is expected to converge is calculated from these measured values such that a reference value by which the supply of toner is controlled can be estimated much more quickly than by waiting for the output of the sensor to stabilize.

Abstract: An image forming apparatus comprising rotatable cassettes rotated by cassette rotating means between a longitudinal feeding station from which paper is fed in a longitudinal direction thereof and a lateral feeding station from which paper is fed in a lateral direction thereof, wherein memory means stores a cassette rotation signal, when the cassette rotation signal is entered therein and cassette rotating means is controlled in accordance with the cassette rotation signal stored in the memory means when a cassette rotation permission signal for permitting the rotation of the rotatable cassette is generated, so that the rotatable cassette is set in a predetermined feeding station.The invention also provides an image forming apparatus capable of storing the feeding station of the rotatable cassette in the memory means and rotating the rotatable cassette to the feeding station stored in the memory means when the rotatable cassette is out of both longitudinal feeding station and lateral feeding station.

Abstract: An automatic exposure control device for use in a copying machine in which a light source for illuminating the light to an original document is controlled based on the signal representing the light amount of the original document sensed by a light senses. There are two kinds of HIGH level limiter for limiting the upper limit of the power supplied to the light source. The HIGH level limiters are selected depending on whether the amount of light of the light source has been raised sufficiently or not, whereby over exposure copy or foggy copy can be prevented.

Abstract: A document detector for a copying machine includes a rectangular document support atop the machine housing and being of corner aligning type which has at least first and second side edges orthogonal to each other for the support thereon of a document with corresponding adjoining sides of the document held generally in abutment with the first and second side edges, and a hingedly supported, generally flat cover mounted on the machine housing for covering the document support when the cover is moved to a closed position.

Abstract: A copying machine uses a belt-like photosensitive member installed between a pair of rollers from which the belt-like photosensitive member is freely detachable or mountable on these.