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Bottom Margin Detection for Last Line Printing

IP.com Disclosure Number: IPCOM000043398D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Raesz, R: AUTHOR [+2]

Abstract

To provide an auto pagination function in a printer that supports vertical tabs and prints on various lengths of paper, the printer utilizes two bottom edge sensors and an algorithm to print on the last possible line while managing widow lines and the various sized indexes and vertical tabs, and also maintaining optimum print throughput. To accomplish pagination, the arrangement of the two margin sensors should be such that the second sensor is at least one inch from the first sensor (approximately). This allows room to make decisions regarding the placement of widow lines. Widow lines will be either placed on the current page along with another line or be put on the next page. Large vertical tabs are broken down by algorithm into indexing steps that are smaller than the distance between the two sensors.

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Bottom Margin Detection for Last Line Printing

To provide an auto pagination function in a printer that supports vertical tabs and prints on various lengths of paper, the printer utilizes two bottom edge sensors and an algorithm to print on the last possible line while managing widow lines and the various sized indexes and vertical tabs, and also maintaining optimum print throughput. To accomplish pagination, the arrangement of the two margin sensors should be such that the second sensor is at least one inch from the first sensor (approximately). This allows room to make decisions regarding the placement of widow lines. Widow lines will be either placed on the current page along with another line or be put on the next page. Large vertical tabs are broken down by algorithm into indexing steps that are smaller than the distance between the two sensors. This is done to properly detect the bottom margin within a known dimension. Indexes and vertical tabs are broken down into 1/4 indexes at a point early enough to allow sensor two to detect the trailing edge within a 1/4 index boundary. The current index or vertical tab is checked by the paginator and modified in accordance with requirements. The next line is then either printed on the current page or printed on the next page if it will not fit, or if it fits but is a widow line. This scheme allows printing to be avoided on the current page until the operator has intervened and formatted the text to fit for optimized ...