Abstract: An image display apparatus according to the present invention includes an image data memory for storing image data to be displayed, an image plane for displaying an image, a low resolution image display unit for displaying an image based on image data on the image plane with low resolution, a mouse for designating a position in a particular region in the image plane, and a high resolution image display unit for displaying an image based on image data of the particular region designated by the mouse on the image plane with high resolution of a resolution level higher than the resolution level of the low resolution.

Abstract: An image display apparatus according to the present invention includes an image data memory for storing image data to be displayed, an image plane for displaying an image, a low resolution image display unit for displaying an image based on image data on the image plane with low resolution, a mouse for designating a position in a particular region in the image plane, and a high resolution image display unit for displaying an image based on image data of the particular region designated by the mouse on the image plane with high resolution of a resolution level higher than the resolution level of the low resolution.

Abstract: A developing apparatus for developing an electrostatic latent image formed on a photoconductive member has a plurality of developer units supported by a rotatable supporting device, an elastic member such as a spring which rotates the supporting device through a predetermined angle to sequentially position the developer units in a developing position, and a switching device which switches the position among the developing units. The switching device has an accumulating device such as an electric motor which accumulates the energy in the elastic member, and a releasing device which releases the energy accumulated in the elastic member to effect the rotation of the supporting device and substantially instantaneous switching of the developer units.

Abstract: In an image forming apparatus, a toner image, formed by developing an electrostatic latent image on the photoreceptor, is primarily transferred to an intermediate transfer member and is secondarily transferred to a recording sheet. The image forming apparatus is provided with a retractable transfer member, which secondarily transfers the toner image on the recording sheet, and a retractable cleaning member, which removes a residual toner on the intermediate transfer member after the secondary transfer. In the above apparatus, when the primary transfer and the secondary transfer are not being performed, the transfer member and the cleaning member are allowed to contact with or retract from the intermediate transfer member.

Abstract: An erasing device for erasing charge remaining on a photosensitive member, comprising: two kinds of light sources which are so provided as to confront the photosensitive member and have different light emitting wavelengths, respectively; and a control device for turning on the light sources simultaneously.

Abstract: A recording apparatus for editing electrical image data output by a data processing system and for visually recording the image data on a recording medium. The recording apparatus is provided with magnet and lead switch pairs for detecting breadthwise size of the recording medium. The size of the recording medium supplied thereto and the size of the image area to be recorded on the recording medium are determined based upon the detected breadth. An image editing unit is provided within the recording apparatus for editing the electrical image data output from the data processing system in an area of memory corresponding to the size of the above determined image area, for outputting the edited data to a printing unit whereby the image data is visually recorded in the image area of the recording medium.

Abstract: An image recording system including a host control unit for supplying image data representative of the images to be printed on a record medium and a printer apparatus for forming printed images on the record medium on the basis of the data received from the host control unit, wherein the printer apparatus comprises an image transfer drum having a photoconductive surface, two or more image developing units responsive to the image data for forming a page of electrostatic latent images on the photoconductive surface, change-over means operative to selectively activate any of the image developing unit into operation, electrostatic chargers and charge erasers for transferring the page of electrostatic latent images on the photoconductive surface to the record medium, characterized in that the host control unit is operative to further supply control data predominant over the modes and conditions in which the images are to be printed on the record medium, the control data containing color data specifying a color or

Abstract: An electric apparatus for carrying out start-up control of a plurality of devices requiring start-up electric currents exceeding an amount of current required at ordinary states thereof. The apparatus has a power source, a signal generating circuit for generating a stable state signal when one or the plurality of the devices enter a stable state after start-up thereof and a control circuit for causing a next device to start in response to the output of the stable state signal to the previously started device or devices. One example of the signal generating circuit includes an electric current measuring circuit and judges that the device is at a stable state thereof when the electric current supplied to the device becomes lower than a predetermined value. The above construction temporarily prevents maximum start-up currents of the devices from being supplied from the power source to the respective devices and consequently reduces the electric load on the power source.