Inkjet Carriage Sheet Detection via Preset Position
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Solution Overview
Problem
Existing inkjet printing devices face inefficiencies in quickly and accurately detecting sheet sizes, leading to potential ink wastage and device smearing when incorrect sheet sizes are fed, as current methods require lengthy edge detection processes.
Innovation Solution
An inkjet printing device with a detector unit on the carriage that moves to a preset detecting position based on print command size information to check if the sheet is present before printing, eliminating the need for full edge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the carriage is moved at a detecting speed lower than the printing speed to detect sheet width, then the sheet width can be detected with increased accuracy, but the detection time becomes excessively long
Solution Approach 1:
The patent extracts the essential function of sheet size verification by removing the need for complete edge detection. Instead of detecting both left and right edges to calculate width, the system only checks for the presence of sheet material at a single predetermined position, extracting the core verification need while eliminating unnecessary detection steps.
Solution Approach 2:
The patent applies partial action by performing only the necessary portion of sheet detection - checking for material presence at one critical position rather than measuring the complete sheet width. This partial detection is sufficient to verify sheet size compliance without requiring full edge-to-edge measurement.
2Reliability
If the sheet width is detected by moving the carriage to detect right and left edges, then the sheet size can be verified, but the process takes a long time before printing can start
Solution Approach 1:
The patent performs preliminary verification by checking sheet presence at a predetermined position before printing commences. This preliminary check ensures sheet size compliance is verified in advance, allowing printing to start immediately after the single-position check without delays from comprehensive width measurement.
3Loss of time
If the detector unit checks only at a predetermined position rather than detecting full sheet width, then the detection time is reduced, but the ability to accurately determine sheet width is compromised
Solution Approach 1:
The patent extracts the essential verification function from complete width measurement. By checking only for the presence of sheet material at a predetermined position, the system obtains sufficient information to verify sheet size compliance without performing full width measurement, thus achieving verification with minimal detection time.
Data Source
AI summary
An inkjet printing device comprises an inkjet print head, a carriage on which the print head is mounted and which moves to and fro in a main scan direction while facing a sheet, a detector unit mounted on the carriage and detecting whether or not the sheet exists at a position facing a detecting position (prescribed position of the carriage in the main scan direction), an acquisition unit which acquires a print command including size information specifying sheet size, a setting unit which sets the detecting position depending on the size information, a moving unit which moves the carriage to the detecting position set by the setting unit, and a checking unit which checks whether the sheet exists at the position facing the detecting position by use of the detector unit after the carriage is moved to the detecting position and before the printing on the sheet is started.