Abstract: An image forming apparatus includes a rotary including a first developing roller, a second developing roller, a first storage frame, and a second storage frame, a body frame with an opening, a first toner cartridge, a second toner cartridge, a first support member which is configured to support the first toner cartridge, and a second support member which is configured to support the second toner cartridge. The first support member is movable with respect to the first storage frame such that the first toner cartridge moves from the first attached position to the first retracted position. The second support member is movable with respect to the second storage frame such that the second toner cartridge moves from the second attached position to the second retracted position.

Abstract: A signal receiver quantization circuit for an image data transmission device in which received signals are quantized correctly even if they are subjected to distortion in their time positions so that degradation of the received images is prevented. In accordance with the invention, a signal receiver includes a digital PLL circuit, a PLL control circuit for detecting the transition times of an input received signal with the digital PLL circuit being controlled in accordance with an output of the PLL control circuit, and a circuit for sampling the input signal in response to an output signal of the digital PLL circuit. In a preferred embodiment, the PLL control circuit detects the transition times of the input signal only during predetermined time slots determined in accordance with the relative phase between the input received signal and a sampling clock.

Abstract: A facsimile system including a facsimile control system implemented with plural microcomputers one of which acts as a master microcomputer coupled to the other microcomputers in a master/slave relationship. At least one of the slave microcomputers has halt and reset inputs coupled to an input/output port of the master microcomputer while another one of the slave microcomputers is coupled through a sub-system in the facsimile system, such as a drive control circuit, to an input/output port of the master microcomputer.

Abstract: A facsimile transmitter which allows faster scanning and transmission of information on a document by skipping over blank areas on said document and comprises a phase signal generating circuit 7 for generating a phase signal, a reading scanning circuit 1 for reading an original document, memory circuits 2, 3 for storing an image signal for one line, a detecting circuit 4 for testing whether or not the image signals for one line are all white signals, a counting circuit 5 for counting signals being generated by the detecting circuit, a sub-scanning mechanism 8 for performing skips by one line on the original document, a clock controlling circuit 6 for controlling the reading scanning circuit 1, the memory circuits 2, 3, and the sub-scanning circuit 8, an oscillator circuit 9 being controlled by the counted value of the counting circuit 5, and a gate controlling circuit 12 being controlled by the count value in said counter circuit, wherein the content of image information having been obtained by the prior scan