Fuji Xerox Co., Ltd.

Tadashi Yamamoto

Masami Kurata

Haruhiko Moriguchi

Noriyoshi Ishikawa

In a method of controlling the sub-scanning of a document reading apparatus the speed, acceleration or deceleration of the reading section is controlled according to the amount of information stored in a buffer memory which temporarily stores information read by the reading section. The values of the movement speeds, accelerations and decelerations are predetermined according to the stored information amount of the buffer memory and at the time of controlling the reading section, one of these values is selected according to the currently stored information amount of the buffer memory. Whereby any vibration in a reading section is prevented to eliminate the irregularity in the sub-scanning of the reading section.

Method for controlling sub-scanning of document reading apparatus

A data reading device of the type employing a plurality of image sensors for reading separated colors is provided with a delay device in the processing circuitry of at least one of the image sensors. The delay device can be set to delay the signal output from the associated image sensor to an arithmetic circuit for a variable time corresponding to a multiple of the line scanning period. In this manner, the image sensors need not be so accurately positioned that the same line is read by each of the several sensors at the same time, but the picture data signals for the same line can nonetheless be fed to the arithmetic circuit simultaneously.

Picture data reading device

A facsimile communication system in which transmission is carried out in such a manner that, when the time of transmission of the video signals of lines provided by scanning an original is shorter than that determined by a facsimile on the signal receiving side, fill bits are transmitted in succession with the video signals so that the time of transmission of each line is adjusted to that determined by the facsimile on the signal receiving side. The period of time required for the facsimile on the signal receiving side to record video signals per line is discriminated by a facsimile on the signal transmitting side for every line according to the contents of video signals. The period of time thus discriminated is utilized as the time of transmission to transmit the video signals for each line.

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Kanagawa, Japan

Tadashi Yamamoto