Sheet Transport Apparatus Air Flow Control
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Solution Overview
Problem
Conventional sheet transport apparatuses experience unstable air flow during unrestrained transport, leading to disruptions in sheet orientation, which affects detection precision when characteristics are detected by directing light, especially when multiple sheets are continuously transported.
Innovation Solution
A sheet transport apparatus with an upstream-side and downstream-side transport unit forming an unrestrained transport section, where an upstream-side air-feed unit creates a downstream air flow and a downstream-side air-feed unit creates a counter-flow to stabilize sheet orientation, controlled by a controller to maintain air flow direction and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air is blown orthogonally from the sides of the transport plane to form an air flow layer, then sheets can be transported in a stable orientation, but the air flow becomes unstable when no sheets are transported or between continuously transported sheets
Solution Approach 1:
The patent applies dynamics by switching from static orthogonal air blowing to dynamic directional air blowing. The air blowing direction is changed from orthogonal to the transport plane to parallel to the transport plane, allowing the air flow to adapt dynamically to the presence or absence of sheets, thereby maintaining stability throughout the transport cycle.
Solution Approach 2:
The patent changes the parameters of air flow by altering the blowing direction from orthogonal to parallel with the transport plane. This parameter change allows the air flow to maintain stability during continuous sheet transport and when no sheets are present, resolving the instability issue in the air flow layer.
2Measurement precision
If sheets are transported in an unrestrained state, then detection precision may be improved, but transport orientation becomes disrupted causing image blurring
Solution Approach 1:
The patent uses pneumatic principles by blowing air parallel to the transport plane to create a controlled air flow environment. This pneumatic approach allows sheets to be transported in an unrestrained state while maintaining stable orientation through the air flow, preventing image blurring during detection.
Solution Approach 2:
The patent introduces air flow as an intermediary between the unrestrained sheets and the detection system. The air flow acts as a mediator that maintains sheet orientation stability without requiring physical contact or restraint, enabling both unrestrained transport and stable detection.
3Productivity
If continuous sheet transport is performed with orthogonal air blowing, then productivity increases, but air flow instability causes disruption of sheet orientation
Solution Approach 1:
The patent applies dynamics by making the air flow direction adaptive rather than fixed. By blowing air parallel to the transport plane, the system dynamically maintains stable air flow during continuous sheet transport, enabling high productivity without sacrificing orientation reliability.
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
The apparatus ensures stable transport orientation of sheets, reducing flapping and improving detection precision by maintaining air flow balance on both sides of the transport plane, even with thin or unstable sheets, thus preventing jamming and enhancing the accuracy of characteristic detection.
Implementation Method 1
an upstream-side air-feed unit configured to form an air flow that flows downstream in transport direction on both sides of a transport plane of the sheet in the unrestrained transport section
Implementation Method 2
By blowing air, an air flow layer for transporting the sheets in a stable orientation between the guide members (between the two opposing faces) is formed
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
According to one embodiment, a sheet transport apparatus includes an upstream-side transport unit (2) configured to hold a sheet (P) and transport the sheet (P) by rotating; a downstream-side transport unit (4) configured to hold the sheet (P) and further transport the sheet (P) by rotating, the downstream-side transport unit (4) being arranged at such a position that an unrestrained transport section (3) is formed where the sheet (P) is not held downstream in transport direction from the upstream-side transport unit (2); an upstream-side air-feed unit (5) configured to form an air flow that flows downstream in transport direction on both sides of a transport plane of the sheet (P) in the unrestrained transport section (3); and a controller (9) configured to control the upstream-side air-feed unit (5) to start forming an air flow before a leading edge of the sheet (P) reaches the unrestrained transport section (3) from the upstream-side transport unit (2), and to stop the air flow before at least a trailing edge of the sheet (P) has reached the unrestrained transport section (3).