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A checking apparatus is described for determining whether printed data will fall inside or outside of predetermined boundaries, thereby to initiate appropriate recovery action.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
52% of the total text.
Page 1 of 2
Boundary Checking Apparatus for Page Printers
A checking apparatus is described for determining whether printed data will
fall inside or outside of predetermined boundaries, thereby to initiate appropriate
In an advanced function printer, there are many entities defined to describe
the media on which the different types of printed data, such as text, image or
graphic data, are placed. Each of the entities is defined by length and width;
hence, there are four bounds on the four sides of the entity. When the user
defines certain printed data, they are applied to the appropriate one or more of
the entities as required by the printer architecture. If the specified printed data
should fall outside the bounds of the applicable entity, certain recovery actions
are called for, depending on the situation and the data type. The combinations of
entities, data types and recovery actions make the checking of these bounds a
very complex task. The following description provides a simple solution to the
Special registers or memories are allocated to hold data for the four
boundaries of an entity. Examples of an entity include the overall area of the
actual paper being used in a printer, the area predesignated as a printable area
or the boundaries of an overlay form. The unit of measurement for the boundary
data should be the same as that used to denote positions of printed data in the
printer, e.g., a picture element (pel) number in the X dimension and a scan
number in the Y dimension. At the time these entities are specified to the printer,
the boundary data is transformed from length and width dimensions specified for
the entities into a single absolute scale. The bounda...