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System-for-controlling-image-formation

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System for controlling image formation

Details

Inventors: Hosaka, Masao; Shimada, Kazutoshi; Ogino, Yoshitaka;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Ruggiero; Joseph
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick Cella Harper & Scinto

A control system suitable for control of an image forming apparatus such as a copying machine having a plurality of objects to be controlled. This system comprises a plurality of control units to individually and independently control those objects to be controlled, a monitor control unit to monitor those control units, and a system bus which is commonly connected to the control units and monitor control unit. The control units time-sharingly and cyclically execute their control operations by time-sharingly occupying the system bus one by one. The monitor control unit operates in parallel with the control units. The control units and monitor control unit are formed on the same semiconductor substrate consisting of, for example, Si or GaAs. The system bus may be a LAN bus or an optical fiber. With this control system, each control unit can execute its own control operation irrespective of an interruption request, so that the processing program procedure is simplified and a reliability of control is also improved.

DETAILED DESCRIPTION It is an object of the present invention to provide a system for controlling image formation in which the above-mentioned drawbacks are eliminated.
Another object of the invention is to provide a system for controlling image formation in which a plurality of objects to be controlled are certainly controlled by way of a simple control procedure.
Still another object of the invention is to provide a system for controlling image formation in which even when the number of objects to be controlled increases or decreases, control data lines among the objects to be controlled can be easily wired and it is also possible to easily cope with a change in system configuration.
Practically speaking, it is a specific object of the invention to provide a system for controlling image formation in which a plurality of control units to independently control each of a plurality of objects to be controlled execute time-sharingly their control operations.
Still another object of the invention is to provide a system for controlling image formation in which a plurality of control units to individually and independently control a plurality of objects to be controlled, transmission control units to transmit control data from the control units to external control execution units, and monitor control units to concentratedly monitor the plurality of control units are integrally formed on a semiconductor substrate.
Still another object of the invention is to provide a control system comprising: a plurality of control execution units to individually and independently control a plurality of objects to be controlled; a plurality of transmission lines to transmit data to control the control execution units; a plurality of input/output interface units provided for each of those plurality of transmission lines; and a central control unit to control those plurality of I/0 interface units.
The above and other objects and features of the present invention will become apparent from the following detailed description and the appended claims with reference to the accompanying drawings

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