Sheet Stacking Apparatus Air Blowing for Coated Sheet Adhesion
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Solution Overview
Problem
Conventional sheet handling apparatuses face challenges in preventing adhesion and bending of coated sheets during stacking due to high surface smoothness and low Clark stiffness, leading to degraded stackability and alignment accuracy.
Innovation Solution
A sheet stacking apparatus with a discharge unit, a stack unit, and a plurality of blowing units that supply air to the discharge side, with the blowing units positioned below the discharge port and aligned perpendicular to the sheet discharge direction, ensuring air is directed toward the lower surface of the sheet to prevent adhesion and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blower fan is provided to form an air layer in the gap between sheets, then sheet adhesion is prevented, but alignment accuracy is degraded due to insufficient air layer coverage
Solution Approach 1:
The patent transitions from a single blower fan providing air flow in one direction to multiple blowing units arranged in a specific spatial configuration (below the discharge port, aligned perpendicular to sheet discharge direction). This dimensional arrangement ensures comprehensive air layer coverage across the entire sheet width, simultaneously preventing adhesion and maintaining alignment accuracy.
Solution Approach 2:
The patent applies air blowing at specific locations where adhesion problems occur most frequently. By positioning blowing units below the discharge port and directing air toward the lower surface of discharged sheets, the system provides localized air layer formation precisely at the critical interface between stacked sheets, ensuring effective adhesion prevention without disrupting overall alignment.
2Reliability
If air is supplied toward the sheet stack surface, then adhesion is prevented, but sheet alignment is disrupted
Solution Approach 1:
The patent employs asymmetric air supply direction by positioning blowing units below the discharge port and directing air flow toward the lower surface of sheets at an angle that avoids the stack surface. This asymmetric configuration creates an air layer that lifts sheets to prevent adhesion while maintaining their horizontal alignment, avoiding the disruption that would occur with symmetric air supply toward the stack surface.
3Manufacturing precision
If coated sheets are used for improved image appearance, then image quality is enhanced, but stackability is degraded due to high adhesion and low stiffness
Solution Approach 1:
The patent uses pneumatic principles by introducing air flow between sheets to create a separating air layer. This pneumatic approach counteracts the high adhesion forces between coated sheets, enabling them to be stacked reliably without direct contact. The air pressure and flow are controlled to prevent adhesion while maintaining sheet stability for proper stacking.
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 solution effectively prevents sheet adhesion and bending, ensuring proper alignment and stackability of coated sheets by creating a sufficient air layer between sheets, thereby maintaining alignment accuracy.
Implementation Method 1
a blower fan is provided to form an air layer in the gap between the leading sheet and the subsequent sheet so as to prevent the sheet discharged into the stack unit from adhering to the sheet already stored in the stack unit
Data Source
AI summary
A sheet stacking apparatus including: a discharge unit configured to discharge a sheet through a discharge port; a stack unit configured to stack the discharged sheet thereon; and a plurality of blowing units configured to supply air to a discharge side of the discharge unit while the sheet is discharged, wherein the blowing units are disposed, below the discharge port, aligned with a direction perpendicular to a sheet discharge direction.