Method of correcting a sheet conveyance error and an apparatus therefor
AssigneeNEC Corporation
InventorMamoru Ikeda
Life of this patent
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Abstract
A method of correcting a conveyance error of a continuous sheet having a train of segments each including a respective segment mark and being conveyed for printing in accordance with the number of steps is disclosed. The method counts steps between consecutive segment marks during conveyance of the sheet to thereby output an actual number of steps, compares the actual number of steps with a preselected number of steps determined by a distance between the consecutive segment marks, and corrects, based on the result of comparison, the start of a new line at even positions of a single segment during subsequent conveyance. An apparatus for practicing the method is also disclosed.
Claims17
A method of correcting a conveyance error of a continuous sheet having a train of segments each including a respective segment mark and being conveyed for printing in accordance with a pre-selected number of steps between said segment marks, said method comprising:
- presorting said pre-selected number;
- printing a succession of evenly spaced plurality of lines on said sheet and between said segment marks, the distance between said printed lines being determined by the number of steps between said successive lines;
- a counting step for counting the steps between consecutive segment marks during conveyance of the sheet to thereby output an actual number of steps;
- a comparing step for comparing the actual number of steps with said pre-selected number of steps determined by a distance between the consecutive segment marks to thereby output a result of comparison;
- and
- a correcting step for correcting, based on the result of said comparison, a start of a new line at even positions on a single segment during a subsequent conveyance of said sheet, said correction step being carried out by adjusting the number of steps between said successive lines.
A method of correcting a conveyance error of a continuous sheet having a train of segments, comprising the steps of:
- counting, while the sheet is conveyed, steps consumed to control a feed motor between consecutive segment marks provided on consecutive segments of said sheet to thereby output an actual number of steps;
- comparing the actual number of steps with a preselected number of steps to thereby calculate a difference;
- printing a succession of lines on said sheet, the distances between said lines being determined by the number of said feed motor steps;
- and
- correcting, the distances between said lines based on the difference, new line portions being located at even positions of a single segment during a subsequence conveyance.
An apparatus for correcting a conveyance error of a continuous sheet having a train of segments each including a respective segment mark and being conveyed for printing successive lines in accordance with a number of steps, between said lines said apparatus comprising:
- counting means for counting the steps between consecutive segment marks during conveyance of the sheet to thereby output an actual number of steps;
- comparing means for comparing the actual number of steps with a preselected number of steps determined by a distance between the consecutive segment marks to thereby output a result of comparison;
- and
- correcting a spacing between said successive lines means for correcting, based on the result of said comparison, thus cause a start of a new line at even positions of a single segment during a subsequent conveyance.
In a printer including an apparatus for correcting a conveyance error of a continuous sheet having a train of segments each including a respective segment mark and being conveyed for printing in accordance with a number of steps, said apparatus comprises:
- printing means for printing successive lines on said sheet;
- counting means for counting the steps between consecutive segment marks during a conveyance of the sheet to thereby output an actual number of steps;
- said comparing means for comparing the actual number of steps with a preselected number of steps determined by a distance between the consecutive segment marks to thereby output a result of comparison;
- and
- correcting means for correcting, spacing between said printed lines, said correction of said spacing being based on the result of said comparison, and
- starting a new line or print at even position relative to a single segment mark during a subsequent conveyance.
Dependencies are inferred from the claim text.