Sheet Feeder Clearance Sensing for Stable Thick Media Feeding
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Solution Overview
Problem
Existing sheet feeders face issues with unstable sheet feeding and conveyance due to inadequate clearances between restricting members and the lateral sides of sheets, particularly with thicker media, leading to increased friction and potential feeding failures.
Innovation Solution
The sheet feeder employs upper and lower distance-measuring sensors to determine the adequacy of clearances between restricting members before lifting the lift table, using a processing circuitry to compare measurements and adjust positions if necessary, ensuring stable sheet feeding and conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the clearance between restricting members and sheet lateral sides is reduced to prevent sheet movement, then sheet positioning stability is improved, but friction increases and feeding reliability deteriorates
Solution Approach 1:
The patent measures the distance between restricting members and sheet lateral sides before the feeding process begins. Based on these measurements, the system determines whether the clearances are adequate and adjusts or repositions the restricting members in advance. This preliminary measurement and adjustment prevents feeding failures caused by inadequate clearances while maintaining stable sheet positioning, resolving the contradiction between positioning stability and feeding reliability.
2Reliability
If the clearance between restricting members and sheet lateral sides is increased to reduce friction, then feeding reliability is improved, but sheet positioning stability deteriorates
Solution Approach 1:
The system performs distance measurements and clearance assessments before feeding begins. Based on the measured values, the restricting members are repositioned or adjusted in advance to achieve optimal clearance values. This preliminary adjustment ensures that clearances are sufficient to reduce friction and improve feeding reliability, while maintaining adequate positioning stability through controlled repositioning.
Solution Approach 2:
The patent makes the restricting members repositionable and adjustable based on measured clearance values. The system dynamically adjusts the positions of restricting members according to the actual sheet dimensions and clearance requirements. This dynamic adjustment capability allows the system to optimize the balance between positioning stability and feeding reliability for different sheet types and conditions.
3Reliability
If distance measurement and clearance verification are performed before lifting the lift table, then feeding stability is improved, but operation time increases
Solution Approach 1:
The patent performs distance measurements and clearance verifications before the lift table is raised, which is the optimal timing since the sheet is stationary and easily measurable. By completing these checks in advance, the system ensures feeding stability is established before the feeding process begins, while minimizing additional time overhead since the measurement integrates with the existing operational sequence.
4Productivity
If the lift table is lifted without verifying clearance adequacy, then operation speed is maintained, but feeding failures occur due to inadequate clearance
Solution Approach 1:
The system measures distances and verifies clearance adequacy before lifting the lift table and before the feeding process begins. This preliminary verification prevents feeding failures that would otherwise require stopping and repositioning, thereby maintaining high operation speed while ensuring feeding reliability. The quick measurement and determination process adds minimal time overhead compared to the cost of feeding failures.
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 ensures minimal downtime and reduced operation time by securing adequate clearances before lifting, preventing unnecessary friction and maintaining stable sheet conveyance, even with thicker media.
Implementation Method 1
an upper distance-measuring sensor that is disposed at an upper portion of the rear-end restricting member, and measures a first distance to the first sheet-side restricting member or the second sheet-side restricting member
Implementation Method 2
a lower distance-measuring sensor that is disposed at a lower portion of the rear-end restricting member, and measures a second distance to the first sheet-side restricting member or the second sheet-side restricting member
Implementation Method 3
The suction conveyor sucks and conveys a sheet floated from the lift table after the lift table is lifted
Data Source
AI summary
A sheet feeder includes a lift table, a first sheet-side restricting member, a second sheet-side restricting member, a suction conveyor, a rear-end restricting member, an upper distance-measuring sensor, a lower distance-measuring sensor, and processing circuitry. The first sheet-side restricting member and the second sheet-side restricting member restrict first ends and second ends opposite to the first ends, respectively, of sheets. The suction conveyor sucks and conveys a sheet floated. The rear-end restricting member restricts the sheets from moving in a longitudinal direction of the sheets. The upper distance-measuring sensor and the lower distance-measuring sensor measure a first distance and a second distance, respectively, to the first sheet-side restricting member or the second sheet-side restricting member. The processing circuitry compares measurement results of the first distance and the second distance to determine whether a distance between the first sheet-side restricting member and the second sheet-side restricting member is adequate.