Roller Separation Control for Sheet Positioning Accuracy
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Solution Overview
Problem
Conveying devices in recording apparatuses face issues with sheet skew feed and lateral deviation due to changes in sheet position from power-off to power-on states, leading to reduced operation throughput and potential staining from incorrect margin settings.
Innovation Solution
A conveying device with a pair of rollers, a separating unit, a holding unit to retain separation status, and a memory unit to store power-off states, controlled by a unit that performs initialization and lateral-deviation correction sequences based on detected conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an initialization operation is performed at power-on to correct sheet lateral deviation, then sheet positioning accuracy is improved, but operation throughput is reduced due to the 30-second execution time
Solution Approach 1:
The system performs the initialization operation and lateral deviation correction at power-off time instead of power-on. The separating unit separates the rollers at power-off to prevent sheet adhesion, and the control unit stores the power-off state in memory. This preliminary action eliminates the need for time-consuming correction at power-on, thus improving throughput while maintaining positioning accuracy.
Solution Approach 2:
The system uses its own power-off transition period to perform the initialization and correction functions that would otherwise require separate power-on processing time. By utilizing the existing power-off event to execute the separation and correction operations, the system serves itself without requiring additional dedicated time resources.
2Manufacturing precision
If the separating unit separates rollers at power-off to prevent sheet adhesion, then sheet positioning accuracy is improved, but device complexity increases due to additional components
Solution Approach 1:
The separating unit is integrated into the existing roller mechanism and serves multiple functions: it separates rollers at power-off to prevent adhesion, and can also assist in sheet feeding operations. The holding unit and memory unit work together with the existing control unit to track and respond to separation status. This multi-functionality approach minimizes the need for entirely new separate systems.
Solution Approach 2:
The control unit combines the functions of detecting power-off state, controlling the separating unit, and storing separation status information into a single integrated control system. The holding unit and memory unit are merged with the existing control architecture, allowing the system to track separation status without requiring completely separate monitoring and storage systems.
Data Source
AI summary
A conveying device performs an appropriate initialization sequence at start of an operation thereof in response to a manipulation of a lever of a non-operational conveying mechanism thereof. The conveying device includes a pair of rollers configured to convey a sheet, a separating unit configured to separate one of the pair of rollers from another of the pair of rollers, a holding unit configured to retain a status representing whether a separation process is performed by the separating unit, a memory unit configured to store information representing a state of the conveying device at power-off, and a control unit configured to control the conveying device based on the status retained by the holding unit and the information stored by the memory unit.