Stapling Ejection Control for Image Forming Apparatus
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Solution Overview
Problem
During the production of a saddle stitched booklet, existing image forming systems require users to manually open the post-processing apparatus to retrieve unbound recording sheets when job cancellation occurs, as they cannot automatically eject bundles exceeding a certain number.
Innovation Solution
An image forming system with a post-processing apparatus that includes a stacker unit, stapling unit, and ejection unit, capable of executing a stapling ejection mode. When a job cancellation instruction is received and the number of recording sheets exceeds a preset limit, the system applies stapling and ejects the sheets automatically, eliminating the need for manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the post-processing apparatus ejects recording sheets without stapling when job cancellation occurs, then the ejection speed is fast and simple, but the apparatus cannot handle bundles exceeding a preset number of sheets requiring manual intervention
Solution Approach 1:
The post-processing apparatus dynamically adjusts its ejection behavior based on the number of recording sheets. When the sheet count exceeds the preset limit, the system automatically activates stapling to bind the bundle, enabling full ejection capacity. This dynamic adaptation eliminates the need for manual door opening while maintaining efficient ejection for smaller bundles.
Solution Approach 2:
The system changes the binding parameter (stapling activation) based on the sheet count parameter. When the number of recording sheets exceeds the preset threshold, stapling is automatically applied to create a bound bundle that can be safely ejected. This parameter-based control allows the apparatus to handle variable bundle sizes without manual intervention.
2Ease of operation
If stapling is applied to all recording sheet bundles during job cancellation, then all bundles can be automatically ejected regardless of size, but staple consumption increases unnecessarily
Solution Approach 1:
Instead of applying stapling to all bundles unconditionally, the system applies stapling partially—only when the recording sheet count exceeds the preset limit. This partial action approach ensures automatic ejection capability is available when needed while avoiding unnecessary staple consumption for smaller bundles that don't require binding.
Solution Approach 2:
The system uses the sheet count as a parameter to control stapling activation. By comparing the actual number of recording sheets against the preset threshold, the system intelligently decides whether to apply stapling, thereby optimizing staple consumption while maintaining automatic ejection functionality.
3Device complexity
If the apparatus maintains a preset limit for unbound bundle ejection, then simple ejection is possible for small bundles, but larger bundles require complex manual retrieval procedures
Solution Approach 1:
The post-processing apparatus performs self-service by automatically determining whether stapling is needed based on the recording sheet count. When a large bundle is detected, the system autonomously applies stapling and enables ejection without requiring the user to manually assess the situation or open the door. This self-service capability eliminates complex manual retrieval procedures.
Solution Approach 2:
Stapling acts as an intermediary mechanism that enables the ejection of large bundles. By introducing stapling as a conditional intermediate step, the system bridges the gap between simple ejection capability and the need to handle large bundles, allowing automatic ejection of any size without complicating the overall ejection mechanism.
Data Source
AI summary
When a job cancellation instruction has been specified, if the number of the recording sheets loaded on the stacker device of a post-processing apparatus is not greater than the predetermined number of sheets, the aforementioned recording sheets are ejected without being subjected to the process of stapling and if it is greater than the predetermined number of sheets, the recording sheets having been stapled are ejected.