Browse Prior Art Database

Boundary Checking Apparatus for Page Printers

IP.com Disclosure Number: IPCOM000051849D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Wang, DT: AUTHOR

Abstract

A checking apparatus is described for determining whether printed data will fall inside or outside of predetermined boundaries, thereby to initiate appropriate recovery action.

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This is the abbreviated version, containing approximately 52% of the total text.

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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 recovery action.

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 problem.

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...