Printing Apparatus Skew Correction Timing Control
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Solution Overview
Problem
Existing printing apparatuses face challenges in synchronizing successive overlapped conveyance and skew correction, leading to unintended or non-intended overlapped conveyance due to varying printing conditions, which can result in image positioning deviations.
Innovation Solution
A printing apparatus with a control unit that executes successive overlapped conveyance by overlapping the trailing edge of a preceding printing medium with the leading edge of a succeeding medium and performs skew correction by making the leading edge of the printing medium abut against a pair of rollers, with a determination unit to determine the timing of skew correction based on specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If skew correction is performed by making the leading edge of the printing medium abut against a pair of rollers, then the skew of the printing medium is corrected, but unintended successive overlapped conveyance may occur or no intended successive overlapped conveyance may occur depending on the position of the preceding printing medium
Solution Approach 1:
The control unit determines in advance whether to execute successive overlapped conveyance based on the position of the preceding printing medium before performing skew correction. This preliminary determination ensures that the skew correction timing is coordinated with the conveyance control, preventing unintended overlapped conveyance while maintaining correction accuracy.
Solution Approach 2:
The system uses feedback from the position detection of the preceding printing medium to adjust the timing of skew correction. By continuously monitoring the position and making real-time adjustments to the skew correction timing, the system ensures reliable conveyance control while maintaining accurate skew correction.
2Productivity
If successive overlapped conveyance is executed to increase printing speed, then printing speed is improved, but synchronization with skew correction becomes difficult to maintain
Solution Approach 1:
The system dynamically adjusts the skew correction timing based on the actual conveyance state and position of printing media. By making the skew correction timing flexible and adaptive to the successive overlapped conveyance rhythm, the system maintains both high printing speed and accurate image positioning without rigid fixed-timing constraints.
3Productivity
If the leading edge of the succeeding printing medium overlaps the trailing edge of the preceding printing medium during conveyance, then printing speed is increased, but image printing position may deviate if skew correction is not synchronized
Solution Approach 1:
The control unit acts as an intermediary that coordinates between the successive overlapped conveyance control and skew correction control. It determines the optimal timing for skew correction based on the conveyance state, ensuring that both the overlapping conveyance and skew correction are synchronized, thereby maintaining both high speed and positioning accuracy.
Data Source
AI summary
A printing apparatus according to the present invention includes a feeding unit, a conveying unit including a pair of rollers, a printing unit, a control unit and a determination unit. The control can execute successive overlapped conveyance and skew correction. In the skew correction a leading edge of the printing medium abuts against the pair of rollers in a stop state. The determination unit determines whether to execute the successive overlapped conveyance. The control unit executes the skew correction of the succeeding printing medium at a timing according to a determination result of the determination unit.