Perforation Member Shear Force Reapplication for Wet Media
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Solution Overview
Problem
Existing post-processing devices for perforating sheets printed by inkjet printers often experience perforation failures, resulting in incomplete holes with adhering chads, which can cause transport issues due to the chads being dropped or caught during handling.
Innovation Solution
A post-processing device with a placement table, a perforation member that applies a shear force, a die hole, and a control unit that moves the perforation member between a standby and perforating position, where the control unit re-applies the shear force upon detecting perforation failure to remove adhering chads and ensure proper hole formation without returning to the standby position immediately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the perforation member performs a single pass through the medium, then the operation speed is high, but perforation completeness deteriorates due to adhering chads causing failure
Solution Approach 1:
The control unit implements periodic action by detecting perforation failure and commanding the perforation member to return to the standby position and perform another perforating operation on the same medium. This multi-pass periodic approach ensures complete perforation by removing adhering chads that caused the initial failure, while maintaining overall operational efficiency through automated detection and re-attempt cycles.
2Loss of time
If the perforation member immediately returns to standby position after perforation, then the operation cycle is short, but perforation quality deteriorates when failure occurs
Solution Approach 1:
The control unit employs feedback by detecting whether perforation has been successfully completed and based on this detection result, determining whether to command the perforation member to return to the standby position for another attempt. This feedback mechanism ensures that perforation quality is maintained by automatically identifying and correcting failed perforations without requiring manual intervention, thus balancing operational efficiency with manufacturing precision.
3Use of energy by moving object
If the perforation member applies shear force once, then the energy consumption is low, but perforation reliability deteriorates due to wet media requiring multiple attempts
Solution Approach 1:
The control unit uses feedback detection to determine whether the single shear force application was successful, and only commands another perforating operation when failure is detected. This feedback-based approach ensures that energy is consumed only when necessary - avoiding unnecessary re-attempts on successfully perforated media while ensuring reliable perforation of wet media that requires multiple attempts, thus optimizing the balance between energy consumption and perforation reliability.
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 solution effectively removes adhering chads and ensures proper hole formation, reducing the risk of transport failures and increasing efficiency by re-applying the shear force at the failure site, especially effective for wet media where perforation failures are more common.
Implementation Method 1
a perforation member (11) that performs perforation by imparting a shear force to the medium (P) placed on the placement table (9)
Data Source
AI summary
Provided are a placement table configured to place a medium onto which liquid is discharged, a perforation member configured to perform perforation by imparting a shear force to the medium placed at the placement table, a die hole provided at the placement table, a perforation member moving section configured to move the perforation member between a standby position above the die hole and a perforating position at which the perforation member enters the die hole, and a control unit configured to control operation of the perforation member moving section, wherein when the control unit obtains perforation failure information during perforating operation in which the perforation member starts moving from the standby position and moves through the perforating position to the standby position, the control unit is configured to control the perforation member moving section so that a shear force is again imparted to the medium.