Sheet Conveyance Speed Control for Accurate Double-Feed Detection
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Solution Overview
Problem
Existing image forming apparatuses face challenges in achieving both high productivity and accurate double feeding detection, particularly when increasing sheet conveyance speed, as it becomes difficult to perform multiple double feeding detections per sheet without compromising productivity.
Innovation Solution
A sheet conveyance apparatus with a control unit that adjusts conveyance speed from a first high speed to a second slower speed for accurate double feeding detection, allowing multiple detections per sheet without stopping the conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheet conveyance speed is increased to obtain high productivity, then productivity is improved, but it becomes difficult to perform multiple double feeding detecting operations for each sheet
Solution Approach 1:
The sheet conveyance speed is dynamically adjusted based on detection requirements. The control unit varies the conveyance speed during the detection process, allowing multiple detection operations to be performed at optimized speeds without completely stopping the sheet, thus maintaining productivity while improving detection accuracy
Solution Approach 2:
The conveyance speed parameter is changed during the detection process. By adjusting the speed parameter according to detection needs, the system can perform multiple detection operations with appropriate timing, resolving the contradiction between high-speed conveyance and accurate detection
2Measurement precision
If double feeding detecting operation is performed for plurality of times for each sheet by varying detection positions, then double feeding detection accuracy is improved, but productivity is decreased due to additional stoppages
Solution Approach 1:
The sheet conveyance is made continuous during the detection process. Instead of stopping the sheet for each detection operation, the control unit coordinates multiple detection operations to occur during continuous conveyance at varied speeds, eliminating idle stoppages and maintaining productivity while achieving accurate detection through multiple measurements
Solution Approach 2:
Detection operations are performed periodically at different positions during sheet conveyance. The control unit schedules multiple detection operations at appropriate intervals as the sheet moves through the system, allowing comprehensive detection without requiring the sheet to stop completely
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 enables high productivity while maintaining accurate double feeding detection by optimizing conveyance speed control and double feeding detection unit placement, ensuring both are achieved simultaneously.
Implementation Method 1
configurations in which ultrasonic double feeding detection units that detect sheets conveyed in an unseparated and overlapping state are disposed
Data Source
AI summary
A sheet conveyance apparatus includes a sheet conveyance unit, a double feeding detection unit, a first sheet detection unit, and a control unit. The double feeding detection unit detects double feeding with respect to a sheet. The control unit controls a conveyance speed of a sheet conveyed by the sheet conveyance unit at a first speed and a second speed which is slower than the first speed and at which the sheet is in motion. The control unit controls the sheet conveyance unit to decelerate the conveyance speed of a sheet conveyed by the sheet conveyance unit from the first speed to the second speed based on a detection result of the first sheet detection unit. The control unit controls the double feeding detection unit to execute a double feeding detecting operation with respect to the sheet that is conveyed at the second speed by the sheet conveyance unit.