Printing Apparatus Sheet Storage Time Threshold Control
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Solution Overview
Problem
Conventional printing apparatuses with fingerprint removal modes incur unnecessary delays due to pre-fixing processes, which slow down printing speed, especially when sheets have been stored for extended periods and fingerprints naturally fade over time.
Innovation Solution
A printing apparatus with a control unit that determines whether to perform heating by the fixing unit based on the elapsed time since the sheet was stored, opting for pre-heating only if the time is below a threshold, thereby skipping unnecessary fingerprint removal steps for sheets that have had sufficient time to naturally lose fingerprints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-fixing is performed to remove fingerprints, then fingerprint marks are removed from the sheet, but printing time increases due to the additional processing step
Solution Approach 1:
The invention changes the parameter of time (elapsed time since sheet storage) to determine whether pre-fixing is necessary. By monitoring how long sheets have been stored and comparing against a threshold, the system dynamically adjusts the printing process - performing pre-fixing only when sheets are freshly stored (within threshold time) and skipping it when sheets have been stored longer, thus resolving the contradiction between ensuring fingerprint removal and minimizing printing time
2Reliability
If pre-fixing is performed on all sheets, then fingerprint marks are removed, but unnecessary processing time is consumed when fingerprints have already faded naturally
Solution Approach 1:
The system uses elapsed time since sheet storage as a dynamic parameter to determine the necessity of pre-fixing. When the elapsed time exceeds a predetermined threshold, the system determines that fingerprints have naturally faded and skips the pre-fixing process, thereby maintaining printing quality while improving overall productivity by eliminating unnecessary processing steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces printing time by eliminating unnecessary pre-fixing processes for sheets that have had enough time for fingerprints to fade, thus enhancing printing efficiency.
Implementation Method 1
the sheet is heated by the fixing unit before the image is transferred to the sheet
Implementation Method 2
removing fingerprint marks by causing a sheet with fingerprints on it to pass through the fixer one time before printing in order to remove the oil component of the fingerprints on the sheet
Data Source
AI summary
If the elapsed time since a sheet was stored in a sheet storage unit is less than or equal to a threshold value, control is performed such that the sheet is heated by a fixing unit before an image is transferred to the sheet, and if the elapsed time since the sheet was stored in the sheet storage unit exceeds the threshold value, control is performed such that processing for heating the sheet with the fixing unit before the image is transferred to the sheet is not performed.