Print Medium Conveyance Switching for Scanner and Colorimeter Calibration
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Solution Overview
Problem
Conventional methods require a rewind operation to perform scanning and colorimetric measurement of a print pattern that straddles both a scanner and a colorimeter due to differences in sheet conveyance control, leading to inefficiencies and potential inaccuracies.
Innovation Solution
A printing apparatus and method that utilizes first and second conveyance controls to sequentially print and measure patterns on a print medium, ensuring a sufficient distance between measurements to allow seamless switching without rewinding, thereby enabling simultaneous scanning and colorimetry in a single conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single print pattern is measured by both scanner and colorimeter, then measurement completeness is improved, but rewind operation becomes necessary due to conveyance control differences
Solution Approach 1:
The measurement pattern is divided into two separate patterns: a first pattern measured by the scanner and a second pattern measured by the colorimeter. This segmentation allows each measurement unit to operate independently with its own conveyance control, eliminating the need for rewind operations while ensuring both measurement devices can accurately measure their respective patterns.
2Measurement precision
If print pattern length is increased to cover both scanner and colorimeter positions, then measurement coverage is improved, but conveyance control accuracy deteriorates
Solution Approach 1:
Instead of using one long pattern that spans both measurement positions, the pattern is segmented into two separate patterns positioned at different locations. The first pattern is optimized for scanner measurement and the second for colorimeter measurement, allowing each pattern to be measured under optimal conveyance control conditions without compromising accuracy.
Solution Approach 2:
The system changes the conveyance control parameters dynamically: using first conveyance control when the first pattern passes through the scanner, and switching to second conveyance control when the second pattern passes through the colorimeter. This parameter change allows each measurement to be performed with the most appropriate conveyance settings.
3Measurement precision
If conveyance control is optimized for scanner measurement, then scanner measurement accuracy is improved, but colorimeter measurement capability deteriorates
Solution Approach 1:
The conveyance control system is made dynamic by implementing switching capability between first conveyance control (optimized for scanner) and second conveyance control (optimized for colorimeter). The conveyance control unit switches between these two control modes based on which measurement pattern is being measured, allowing the system to adapt to different measurement requirements while maintaining high accuracy for both devices.
Solution Approach 2:
The conveyance control unit acts as an intermediary that manages the transition between different conveyance control modes. It coordinates the switching between first and second conveyance control, ensuring that each measurement device receives the appropriate conveyance control for optimal measurement while maintaining seamless operation of the overall measurement process.
Data Source
AI summary
A printing apparatus comprises a unit configured to convey a print medium by conveyance control including first conveyance control and second conveyance control, a unit configured to switch from the first conveyance control to the second conveyance control, a unit configured to print a first pattern and a second pattern on the print medium, a unit configured to measure the first pattern on the print medium conveyed according to the first conveyance control, and a unit configured to measure the second pattern on the print medium conveyed according to the second conveyance control. The second pattern is printed after printing the first pattern such that a distance between the first and second patterns is greater than or equal to a distance that the print medium is conveyed until the first conveyance control is switched to the second conveyance control after printing the first pattern.