Printing Apparatus Successive Overlapped Conveyance Control
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Solution Overview
Problem
The existing method of successive overlapped conveyance in printing apparatuses leads to decreased conveyance accuracy and printing quality due to thickness differences and potential slipping between printing media, which hampers the increase in printing speed.
Innovation Solution
A printing apparatus with a control unit that executes successive overlapped conveyance by nipping the overlapping portion between the trailing edge of a preceding printing medium and the leading edge of a succeeding printing medium only after the preceding medium has completed printing, ensuring accurate alignment and conveyance without overlapping during the printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If successive overlapped conveyance is executed to increase printing speed, then productivity is improved, but manufacturing precision deteriorates due to thickness differences and slipping between printing media
Solution Approach 1:
The control unit determines in advance whether successive overlapped conveyance can be executed by checking if the printed area of the preceding printing medium and the non-printed area of the succeeding printing medium overlap. This preliminary determination prevents conveyance accuracy degradation by ensuring proper area overlap before execution, while still enabling increased printing speed when conditions are met.
2Productivity
If successive overlapped conveyance is executed, then productivity is improved, but reliability deteriorates due to potential slipping between printing media
Solution Approach 1:
The control unit continuously monitors the printed area information of the preceding printing medium and the non-printed area information of the succeeding printing medium. Based on this feedback, it determines whether to execute successive overlapped conveyance, thereby maintaining reliable conveyance by avoiding situations where slipping may occur, while still achieving high printing speed when conditions permit.
Data Source
AI summary
The present invention provides a printing apparatus. The printing apparatus includes a feeding unit, a pair of rollers configured to nip a printing medium and to convey the printing medium fed by the feeding unit, a printing unit and a control unit. The control unit can execute successive overlapped conveyance in which the pair of rollers nip an overlapping portion between a trailing edge of a preceding printing medium and a leading edge of a succeeding printing medium and convey them. The control unit executes the successive overlapped conveyance at least on condition that printing of the preceding printing medium by the printing unit has ended.