Image forming system and printing-medium feeding device

Details Image forming system and printing-medium feeding device Image forming system and printing-medium feeding device

2007-08-06

2011-11-08

Dehkordy, Saeid Ebrahimi (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Detail of medium positioning

C271S126000

Reexamination Certificate

active

08054475

ABSTRACT:
Provided is an image forming system that suppresses an increase in number of signal lines between an image forming apparatus and optional units, curtails communication time period and alleviates communication load. To accomplish this, an image forming system includes an image forming apparatus and one or more optional units removably attached to the image forming apparatus. The image forming apparatus transmits a specifying command and an instruction command to all of the optional units by outputting the commands on a single common signal line. Each optional unit outputs acknowledgement status on a single common signal line in a case where an identifier appended to the instruction command is the same as an acquired identifier. If the identifiers are different, on the other hand, each optional unit outputs a value indicating whether it itself is currently performing an operation in response to acknowledgement status transmitted by another optional unit.

REFERENCES:
patent: 5619307 (1997-04-01), Machino et al.
patent: 6785478 (2004-08-01), Takahashi et al.
patent: 2004/0253010 (2004-12-01), Takahashi
patent: 04-199159 (1992-07-01), None
patent: 08-008935 (1996-01-01), None

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