Sheet Transport Device Detection Unit Placement
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Solution Overview
Problem
Existing sheet transport devices often fail to prevent the accidental or forcible setting and transportation of sheets smaller than the minimum specified size, leading to potential transport failures and difficulties in retrieving such sheets.
Innovation Solution
A sheet transport device equipped with a separation roller and a first detection unit positioned orthogonally to the transport direction, ensuring that sheets smaller than the minimum size cannot be transported by maintaining a distance between the detection unit and the separation roller that exceeds the short side of the non-allowable sheet size, thereby preventing their passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport roller pairs are arranged within a distance allowing sheet passing, then sheet transport reliability is improved, but minimum sheet size is constrained
Solution Approach 1:
The first detection unit detects the presence of a sheet on the sheet supporting surface before the transport process begins. This preliminary detection prevents small sheets from being transported by stopping the transport operation before it starts, thus avoiding transport failures while maintaining the existing roller arrangement for reliable transport of properly sized sheets.
2Productivity
If sheet transport distance is extended, then reading capability is improved, but difficulty in retrieving small sheets increases
Solution Approach 1:
The detection unit performs preliminary detection of sheet presence before transport begins. By stopping the transport operation before it starts when no sheet is detected, small sheets are prevented from being transported into the reading position, thus maintaining reading capability for proper sheets while making retrieval of small sheets trivial (they never leave the sheet supporting surface).
Data Source
AI summary
A sheet transport device includes a sheet supporting surface which receives a plurality of sheets set thereon, a separation roller which separates the sheets set on the sheet supporting surface sheet by sheet to transport a separated sheet in a predetermined transport direction, and a first detection unit which is disposed to the supporting surface and detects whether a sheet is set on the sheet supporting surface. The separation roller and the first detection unit are disposed to be separated at least in a sheet width direction orthogonal to the predetermined transport direction, and a distance between the first detection unit and an end edge of the separation roller at a side of the first detection unit is longer than a short side of a non-allowable sheet which is smaller than a minimum sheet size within an allowable transport range set in the sheet transport device.