Abstract: A latent image is formed on a photoreceptor. Each of a plurality of toner carriers carries toner of a single color to be transferred onto the photoreceptor to make the latent image visible. Each of the toner carriers is fixed at a predetermined distance from a surface of the photoreceptor. A first bias supplier supplies a first bias required to transfer the toner to the photoreceptor to one of the toner carriers which is subjected to a developing operation. A second bias supplier supplies a second bias which is not enough to transfer the toner to the photoreceptor to the other toner carriers which are not subjected to the developing operation.

Abstract: The present invention is a printer controller furnished with a processor for exclusively executing a first task (printing task) for controlling a print engine, a second task (communication task) for controlling communication with host computers, and a third task (language task) for generating image data. These tasks are assigned priorities of execution in the order of the printing task, the communication task, and the language task. When there is a request for the execution of a task with a higher priority during the execution of a task with a lower priority, the processor executes the higher priority task whose execution has been requested instead of the lower priority task currently being executed. Therefore, the processor is able to execute the communication task, language task, and printing task with no conflict.

Abstract: A latent image is formed on a photoreceptor. Each of a plurality of toner carriers carries toner of a single color to be transferred onto the photoreceptor to make the latent image visible. Each of the toner carriers is fixed at a predetermined distance from a surface of the photoreceptor. A first bias supplier supplies a first bias required to transfer the toner to the photoreceptor to one of the toner carriers which is subjected to a developing operation. A second bias supplier supplies a second bias which is not enough to transfer the toner to the photoreceptor to the other toner carriers which are not subjected to the developing operation.

Abstract: An image information print system has a reception task for receiving data containing print information input from a host computer, a job language interpretation task for interpreting the data, a print data analysis task for converting the format of the print information to prepare intermediate print information, memory means for storing the data and the intermediate print information, and a print management task for issuing a print execution instruction based on print specifications of print information contained in the data according to interpretation of the job language interpretation task and converting the intermediate print information into bit image data and executing print based on the print execution instruction.

Abstract: In a page printer (3), a controller (7) calculates the length of paper from a paper size specified by a host computer (1) and notifies a printing portion (11) of the calculated paper length, and the printing portion (11) executes the feeding of paper (13) which is set based on the assumption that the paper (13) has the paper length notified by the controller (7). The printing portion (11) measures the actual length of the paper (13) during the paper feeding and notifies the controller (7) of the measured actual paper length, while the controller (7) judges in accordance with the actual paper length notified by the printing portion (11) whether there is present a paper size error. If it is found that the paper size error is present, then the controller (7) assumes the actual width of the paper (13) from the actual paper length of the paper (13), and then compares the actual length and width of the paper (13) with the greatest length and width of a printed image.

Abstract: A page printer and system including a page printer. The page printer and each paper handling accessory device within the system includes a control unit. The control unit of the printer includes a main control unit and an auxiliary control unit. The main control unit supplies at least recording format data associated with the recording format of the recording data to the auxiliary control unit. The main control unit also inspects the specifications of each accessary device which have been previously stored in the auxiliary control unit to place the system in a standby state prior to receiving instructions to begin printing. The auxiliary control unit stores the specifications associated with each optional device and the recording format data and controls the operation of the page printer and each accessary device.

Abstract: All index information recorded on a magnetic cassette tape detachably mounted on a document information filing system and corresponding severally to a plurality of image information are stored in a RAM in a control section. The RAM is quickly searched for an index information corresponding to a desired image information, a magnetic head is set to a track position and a block position designated by the detected index information, an image information is read out from the designated position, and the read image information is formed into a hard copy by a printing device.

Abstract: Picture information is stored in a plurality of memory chips arranged in a matrix fashion at a plurality of randomly accessible addresses. The memory chips are accessed by both a chip select signal, formed from a combination of a picture information display angle designating signal and an information read out clock signal, and address designating signals in row and column directions. The picture information is read out and displayed by a CRT display unit in a direction designated by a display angle designating signal.

Abstract: A picture information display having a control circuit for determining a reductive ratio which is set in a size converting circuit in accordance with the size of an orginal and the size of a display area at a display unit. The size converting circuit reduces the size of the picture information read out from a page buffer memory of the control circuit in accordance with the reductive ratio. The readout picture information is stored in a refresh memory of a display interface. The display unit displays the size-reduced picture information of the refresh memory. The reductive ratio is so selected that the picture information stored in the refresh memory is displayed over the entire region of a display area of the display unit.

Abstract: A first location and a last location of the required part of a first piece of picture information displayed at a display part are specified by cursors. Cleared data is transferred to a picture element memory where said picture information is stored for removing unnecessary picture information. The extracted necessary picture information is recorded in a magnetic tape device. Only the necessary part of a second piece of picture information is extracted in a similar manner and is recorded in the magnetic tape device. A logic sum of a title input from the keyboard and said first piece of picture information is obtained for each scanning line to provide a first synthesized picture. A logic sum of the first synthesized picture and said second piece of picture information is obtained for each line to provide a second synthesized picture.

Abstract: Picture information temporarily stored in a buffer memory is reduced to a scale through a size conversion circuit and stored in a refresh memory in an interface device for display. A cursor of a predetermined size is set with respect to the picture information in the refresh memory. Cursor-added picture information or partial picture information enclosed by the cursor is displayed on the screen of a CRT display unit.

Abstract: Picture information stored in a memory device is read out and written into a page buffer and visually displayed on the screen of a CRT display under control of an interface unit for display, through a size conversion circuit.

Abstract: A picture information processing and storing device includes a page buffer for storing original picture information for one scanning line in each row thereof, a line buffer for storing original picture information for each row, a read only memory in which a run length code to MH code conversion table is stored, and address designation circuit for supplying address data to the read only memory in response to each original picture data read out from said line buffer, a shift register circuit for successively storing data from the read only memory, and an EOL code generator for providing an end-of-line code after MH code data corresponding to original picture information stored in said line buffer when the entire MH code data is stored in the page buffer.

Abstract: A first location and a last location of the required part of a first piece of picture information displayed at a display part are specified by cursors. Cleared data is transferred to a picture element memory where said picture information is stored for removing unnecessary picture information. The extracted necessary picture information is recorded in a magnetic tape device. Only the necessary part of a second piece of picture information is extracted in a similar manner and is recorded in the magnetic tape device. A logic sum of a title input from the keyboard and said first piece of picture information is obtained for each scanning line to provide a first synthesized picture. A logic sum of the first synthesized picture and said second piece of picture information is obtained for each line to provide a second synthesized picture.

Abstract: In a picture information filing system using an endless magnetic tape (43), which has a plurality of picture information recording tracks (48.sub.2) for a plurality of units of recording two-dimensional picture information (3) in predetermined blocks and an index information recording track (48.sub.1) for recording index information for the individual unit picture information, the index information is temporarily stored in a random access memory (13) as unit index information groups each consisting of a predetermined number of index information items, recording start index information consisting of a peculiar code and an address representing the position from which to record the next picture information is added to the last index information item in the last index information group, and the individual index information groups are recorded in predetermined blocks of the index information recording track, each index information group in each particular block.

Abstract: An information recording system is provided with a page buffer for storing one page information of those pieces of information supplied from an exterior information supplier. The information stored in the page buffer is read out character by character and the read-out information is latched in a character selection latch circuit capable of storing one character. The row information of a character arranged in a dot matrix corresponding to the character read out is latched in a row selection latch circuit. The information produced from said character selection latch circuit and the row selection latch circuit are supplied to a character generator. Upon receipt of the information, the character generator produces the given dot information in parallel. The dot information are supplied to a shift-register where those are converted into a serial form of information.

Abstract: A recording character configuration changing system is provided with a pulse signal generator for producing pulse signals as a reference. The output signals from the pulse signal generator is inputted to a preset counter which changes the frequency of a signal inputted thereinto in accordance with a value set therein. The signal with the changed frequency is applied to a shift register for effecting parallel-serial convertion of a dot signal. As a result, the exposure time intervals due to the dot signal are changed to change the horizontal size of a character to be recorded. The recording character configuration changing system is further provided with a blanking counter. By setting a proper value into the blanking counter, a time interval between the starts of an exposure scanning to the succeeding exposure scanning is changed to change the vertical size of the character to be recorded.