Sheet Stacker Position Detector Placement
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Solution Overview
Problem
Existing sheet stackers face challenges in accurately regulating the position of sheets in the width direction, leading to potential print misalignment and conveyance failures due to inefficient detection and positioning mechanisms.
Innovation Solution
A sheet stacker design incorporating a pair of movable sheet restrictors, a sheet feeder, and a position detector, where the position detector is strategically placed above the sheet feeding position to reliably detect the position of the sheet restrictors, ensuring accurate sheet positioning and feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position detector is disposed below the sheet feeding position, then the structure is simpler, but the detection accuracy is insufficient leading to print misalignment
Solution Approach 1:
The position detector is moved from a horizontal arrangement (below the sheet feeding position) to a vertical arrangement (above the sheet feeding position), utilizing the vertical dimension to achieve better detection accuracy without increasing horizontal complexity
2Reliability
If the sheet restrictors are not precisely positioned, then the device operation is simpler, but print misalignment and conveyance failures occur
Solution Approach 1:
The position detector provides real-time feedback on the position of the sheet restrictors, enabling the control system to adjust and maintain precise positioning, thereby improving reliability without requiring extremely tight manufacturing tolerances
3Measurement precision
If the position detector is placed above the sheet feeding position between the sheet restrictors, then the detection accuracy improves, but the device complexity increases
Solution Approach 1:
The position detector serves multiple functions: detecting the position of sheet restrictors, ensuring accurate sheet positioning, and preventing both print misalignment and conveyance failures, thereby justifying the increased device complexity through multi-functionality
Data Source
AI summary
A sheet stacker includes a sheet stacking portion, a pair of sheet restrictors, a sheet feeder, and a position detector. A bundle of sheets is stacked on the sheet stacking portion in a stacking direction, and the sheet stacking portion moves in the stacking direction. The pair of sheet restrictors move in a width direction to regulate a position of the bundle of sheets in the width direction. The sheet feeder feeds a top sheet of the bundle of sheets at a sheet feeding position in a sheet feeding direction. The sheet feeding position is disposed at a top of the bundle of sheets in the stacking direction. The position detector is disposed between the pair of sheet restrictors in the width direction and above the sheet feeding position in the stacking direction. The position detector detects a position of the pair of sheet restrictors in the width direction.