Sheet Stacking Device Turnable Anti-Slip Stopper
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Solution Overview
Problem
In sheet stacking devices, the conveyance force needs to be reduced to prevent collapse of small sheet stacks, but excessive reduction can lead to sheets being pushed and falling when continuously conveyed, especially when the number of stacks is small.
Innovation Solution
A sheet stacking device with a conveyance part and a stopper, where the stopper has a main plate inclined upward and anti-slip members with a higher frictional coefficient than the sheet stack, preventing sheets from falling by guiding them along the ribs and ensuring stable stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the conveyance force of the conveyance belt is reduced to prevent collapse of small sheet stacks, then the sheet stacks are prevented from collapsing, but the sheet stacks discharged earlier may be pushed by later stacks and fall from the stopper
Solution Approach 1:
The stopper surface is divided into different regions with different friction characteristics. The upper surface has a standard friction coefficient for normal stacking operations, while the lower surface specifically designed to contact the sheets discharged earlier has a higher friction coefficient. This local differentiation allows the stopper to reliably hold both small stacks (preventing collapse) and large stacks (preventing displacement), thereby resolving the contradiction between stability and reliability.
2Stability of the object's composition
If the conveyance force is excessively reduced, then sheet collapse is prevented, but sheets cannot be properly conveyed and stacked
Solution Approach 1:
The stopper employs differential friction coefficients on its upper and lower surfaces. The lower surface with higher friction prevents sheets from sliding off during conveyance, maintaining productivity, while the overall system maintains gentle conveyance forces to prevent stack collapse. This local quality differentiation resolves the contradiction between stability and productivity.
3Reliability
If the stopper has a high friction surface to prevent sheets from falling, then sheets are securely held, but the conveyance belt cannot effectively convey the sheets
Solution Approach 1:
The stopper's friction-enhancing surface is localized to the lower surface that contacts held sheets, while the upper surface maintains standard friction properties for smooth sheet placement during conveyance. This spatial differentiation allows the stopper to reliably hold sheets without impeding the conveyance belt's ability to move sheets at appropriate speeds.
Solution Approach 2:
The stopper surface is segmented into functionally distinct regions: an upper surface for sheet reception and conveyance with standard friction, and a lower surface for sheet retention with enhanced friction. This segmentation allows each region to optimize its function without compromising the other, resolving the contradiction between holding reliability and conveyance speed.
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 anti-slip members prevent sheets from falling even when pushed by later stacks, allowing for stable stacking without the need for a conveyance force decreasing mechanism, ensuring sheets are aligned and stacked correctly.
Implementation Method 1
A frictional coefficient between the anti-slip member and the sheet stack is larger than a frictional coefficient between the sheet stack and the contact face
Data Source
AI summary
A sheet stacking device includes a conveyance part and a stopper. The conveyance part includes a tray and a conveyance member. On the tray, sheet stacks are stacked. The conveyance member conveys the sheet stack on the tray. The stopper is located on a downstream side of the tray and prevents the sheet stack from falling from the tray. The stopper has a main plate and an anti-slip member. The main plate is inclined upward. The main plate has a contact face coming into contact with the sheet stack and a bent face bent downward from a downstream side tip end of the contact face. The anti-slip member is provided from a downstream side end portion of the contact face to the bent face. A frictional coefficient between the anti-slip member and the sheet stack is larger than a frictional coefficient between the sheet stack and the contact face.