Sheet Stacking Apparatus Weight-Based Transport Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printing systems face challenges in discharging heavy stacks of sheets due to the weight of ink moisture, leading to potential synchronization loss and failure in discharging the sheet bunch to a stack tray.
Innovation Solution
A sheet stacking apparatus with a recognizing section to assess the weight of the sheet bunch and a control section to adjust the transport force, ensuring reliable discharge by increasing the drive force when the sheets are heavy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sheets are printed with a large amount of ink, then image quality is improved, but the sheet weight increases causing discharge failure
Solution Approach 1:
The system changes the transport parameters (speed, acceleration, force) based on the detected sheet weight. When heavy sheets are detected through ink amount detection, the discharge section operates with modified parameters including reduced speed and increased transport force to successfully discharge the heavy sheet bunch without motor synchronization loss.
2Reliability
If the drive force is increased to discharge heavy sheets, then discharge reliability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts transport parameters based on sheet weight detection. For heavy sheets, it increases transport force and reduces speed to ensure reliable discharge. For normal weight sheets, it uses standard parameters, thus avoiding unnecessary energy consumption while maintaining discharge reliability when needed.
Solution Approach 2:
The system employs feedback through weight detection (ink amount detection) to determine the appropriate transport parameters. The detection result feeds back to the control section, which then selects the suitable discharge mode, creating a closed-loop control system that optimizes energy usage based on actual sheet conditions.
3Reliability
If the transport speed is reduced for heavy sheets, then discharge success rate is improved, but productivity decreases
Solution Approach 1:
The system changes transport parameters conditionally based on sheet weight. When heavy sheets are detected, it reduces speed and increases force to ensure successful discharge. When sheets are of normal weight, it maintains standard transport speed, thus preserving productivity while ensuring discharge success rate for heavy sheets.
Solution Approach 2:
The system dynamically adjusts transport parameters rather than using a fixed slow speed for all sheets. The transport speed and force are adapted in real-time based on the detected sheet weight, allowing fast processing for normal sheets and careful handling for heavy sheets, optimizing both productivity and success rate.
Data Source
AI summary
To enable a bunch of sheets to be reliably discharged to a stack tray, also in the case where weight of the bunch of sheets formed on a processing tray is large, a post-processing control section receives information on an ink discharge amount, the number of sheets, sheet type, and printing mode (two-side/one-side) in printing on sheets from a main body control section of an image forming unit A, in forming a bunch of sheets on the processing tray. The control section thereby recognizes weight of a bunch of sheets formed on the processing tray, and when the section determines that the weight is heavier than predetermined weight, decreases a rotation velocity of a drive motor of a sheet bunch transport means, or increases a current amount applied to the drive motor. By this means, torque of the motor is increased, and the bunch of sheets is reliably discharged to the first stack tray.