Dynamic Print Zone Adjustment via Sheet Edge Detection
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Solution Overview
Problem
Existing printing devices face challenges in maintaining a consistent print zone due to variations in sheet media and printer tolerances, leading to potential printing errors and increased costs from using expensive optical sensors.
Innovation Solution
A method and apparatus that detect the leading and trailing edges of sheets to determine a valid sheet step count, allowing the printer to adjust the print zone dynamically, using a processor-controlled system with edge detectors and stepper motors to ensure accurate positioning and adaptation to different sheet sizes and weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive optical sensors are used to accurately detect the leading edge of sheets, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent replaces expensive optical sensors with inexpensive edge detectors that have no moving parts and require minimal maintenance. These simple detectors provide sufficient accuracy for detecting sheet edges while dramatically reducing device cost and complexity.
Solution Approach 2:
The patent substitutes mechanical/optical sensing systems with an electrical sensing approach using edge detectors connected to a processor. The system uses electrical signals to detect sheet presence and position, replacing complex optical mechanisms with simpler electronic detection.
2Reliability
If a shorter print zone is assumed to ensure printing stays within sheet boundaries, then reliability is improved, but productivity decreases
Solution Approach 1:
The patent implements dynamic adjustment of the print zone based on actual sheet detection. The processor modifies print zone parameters in real-time according to detected sheet edges, allowing the print zone to expand or contract as needed. This maintains reliability by adapting to each sheet while maximizing printable area.
Solution Approach 2:
The system uses feedback from edge detectors to continuously monitor sheet position and adjust the print zone accordingly. The processor receives detection data and modifies print zone parameters to ensure accurate printing while utilizing the maximum available sheet area, resolving the contradiction between safety margins and productivity.
3Productivity
If sheet feeding speed is increased to improve productivity, then productivity is improved, but measurement precision deteriorates due to sensor errors
Solution Approach 1:
The patent uses simple edge detectors without moving parts that remain accurate at high speeds. These stationary detectors provide reliable sheet position information even during rapid sheet feeding, eliminating the measurement errors that plague mechanical sensors at high velocities.
Solution Approach 2:
The system replaces mechanical sensing with electrical detection that is not subject to mechanical wear or inertia. The edge detectors and processor provide accurate position feedback at high feeding speeds without the sensor errors that limit mechanical/optical systems.
Data Source
AI summary
A method and apparatus for adjusting the print area by positioning a sheet in an imaging device utilizing length data from a prior sheet. A first sheet length is measured and thereafter utilized to determine the print zone for a subsequent sheet.