Printing Apparatus Carriage Detection for Cut Alignment
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Solution Overview
Problem
In printing apparatuses that convey and cut roll sheets, errors in the relative position between the print head and the cutter can occur due to aging or replacement, leading to misalignment of the cut portion and the printed image.
Innovation Solution
A printing apparatus with a detection unit on a movable carriage that detects the cut portion and adjusts the moving distances of the carriage and slitter based on specific moving distances to ensure accurate cutting and printing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the origin positions of the print head and longitudinal direction cutter are arranged at separated positions, then the printing apparatus can operate with independent reference points for printing and cutting, but the relative position between the print head and cutter may shift due to aging or replacement
Solution Approach 1:
A detection unit is provided that detects the position of a detection target on the printing medium. The control unit calculates the actual relative position between the print head and cutter based on detection results, and uses this feedback to correct moving distances, thereby maintaining alignment precision despite aging or replacement
Solution Approach 2:
The system dynamically adjusts the moving distance parameters of the print head and cutter based on detected positional deviations. By changing the movement parameters rather than relying on fixed mechanical alignment, the system compensates for wear and replacement variations
2Adaptability or versatility
If the relative position between print head and cutter is controlled with reference to separate origins, then each component can be independently positioned, but errors may occur in the relative position due to aging or replacement
Solution Approach 1:
The detection unit provides continuous feedback on the actual position of the printing medium and cut portions. This feedback loop allows the control unit to compensate for drift caused by aging or replacement, maintaining reliable alignment between printing and cutting operations
Solution Approach 2:
The system performs preliminary detection of the detection target position before cutting operations. By detecting and calculating the relative position in advance, the system can pre-correct movement commands to ensure accurate alignment even when components have aged or been replaced
3Device complexity
If no detection unit is provided, then the apparatus structure remains simple, but the relative position of cut portion and printed image may be shifted from desired position
Solution Approach 1:
The system replaces complex mechanical alignment mechanisms with a detection unit and control algorithm. Instead of using精密 mechanical linkages to maintain alignment, the invention uses optical/electrical detection and software-based correction, achieving precision with simpler overall architecture
Solution Approach 2:
A detection target is provided on the printing medium that serves as an intermediary for position detection. This intermediary element allows the detection unit to accurately measure positions without requiring direct mechanical contact or complex alignment mechanisms between the print head and cutter
Data Source
AI summary
A printing apparatus including: a carriage having a print head and configured to be movable in an intersecting direction; a slitter unit configured to be movable in the intersecting direction and cut a roll sheet in a conveyance direction; a detection sensor mounted on the carriage and configured to detect a cut portion of the roll sheet that has been cut by the slitter unit; and a control unit configured to control the carriage to move after controlling the slitter unit to move and cut the roll sheet, so that the cut portion made by the slitter unit is detected by the detection sensor, and configured to control a moving distance of the carriage or the slitter, based on a first moving distance by which the slitter unit has moved and a second moving distance of the carriage at a timing where the detection sensor detects the cut portion.