Image forming apparatus having self-repair function and self-rep

Details Image forming apparatus having self-repair function and self-rep Image forming apparatus having self-repair function and self-rep

1993-10-06

1995-08-29

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

395180, G03G 1500

Patent

active

054465230

ABSTRACT:
In an image forming apparatus according to the present invention, a software portion incorporated in the apparatus is provided with a virtual case storage portion 12, to previously create virtual cases by a virtual case compiler 16 outside of the apparatus and store the virtual cases. Fault diagnosis is made by comparing fuzzy qualitative values into which the values of sensors are converted on the basis of fuzzy membership functions with the virtual cases. If a fault is diagnosed as a result of the comparison, repair operations for repairing the fault are read out from a work script table 15. In this case, operation information for repair are stored to correspond to each of a plurality of domains into which a state space which the apparatus can take up is divided. Accordingly, it is possible to correctly read out corresponding repair operations from the work script table 15 depending on which of the domains is a domain to which the present state of the apparatus belongs. As a result, a self-repair system can be constructed as a practical built-in type system, thereby to make it possible to reduce the scale of the system related to the fault diagnosis as well as to reduce time required for the fault repair.

REFERENCES:
patent: 5166934 (1992-11-01), Tomiyama et al.
patent: 5220373 (1993-06-01), Kanaya
patent: 5239547 (1993-08-01), Tomiyama et al.
patent: 5307118 (1994-04-01), Morita

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