Tractorless Paper Page Alignment via Inverse Offset Control
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Solution Overview
Problem
High-speed printers face issues with page alignment when printing on tractorless paper, as the increased printable area causes pages to not line up front-to-back, making it difficult to cut or fold, especially when using N-up or cut-sheet emulation modes.
Innovation Solution
The processing of print jobs is modified to align pages front-to-back by determining offsets for the front pages and applying their inverse offsets to the back pages, using an imposition controller to maintain alignment across the web, even when the paper size exceeds the intended layout size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If tractorless paper is used to increase printable area, then the printable area is increased to 18 by 11 inches, but the pages do not line up front-to-back causing issues with cutting or folding
Solution Approach 1:
The imposition controller pre-calculates and applies offsets to the front pages and inverse offsets to the back pages before printing. This preliminary positioning ensures that when the paper is printed and subsequently cut or folded, the pages align correctly despite using tractorless paper with increased printable area
Solution Approach 2:
The system modifies the print job processing by dynamically adjusting offset parameters for front and back pages based on the paper type detected. When tractorless paper is detected, the system applies specific offset transformations to maintain alignment, effectively changing the positioning parameters to compensate for the absence of tractor strips
2Productivity
If N-up formatting or cut-sheet emulation mode is used on tractorless paper, then multiple pages can be printed across the width, but the pages are positioned such that they do not line up front-to-back
Solution Approach 1:
Before printing multiple pages in N-up or CSE mode, the imposition controller pre-calculates the appropriate offsets for each page position and applies them to both front and back pages. This ensures that even when multiple pages are arranged across the width of tractorless paper, they will align correctly front-to-back after cutting or folding
Solution Approach 2:
The system dynamically adjusts the positioning parameters for each page in the N-up or CSE layout based on the detected paper type. When tractorless paper is used, the system modifies the offset parameters for each page position to compensate for the increased printable area, ensuring proper alignment is maintained across all pages
Data Source
AI summary
System and methods for page alignment for tractorless paper. In one embodiment, an apparatus receives a print job to be printed on a continuous web of print media in a duplex format with multiple first pages across a front of the web and multiple second pages across a back of the web which correspond with the multiple first pages. The apparatus maps pages to sheetlet regions, and applies first offsets to the sheetlet regions on the front of the virtual continuous forms based on operator input. The controller also determines second offsets for the sheetlet regions on the back of the virtual continuous forms based on an additive inverse of the first offsets, and modifies processing of the print job by applying the second offsets to the sheetlet region on the back of the virtual continuous forms to maintain alignment of front pages and back pages across the web.