Sheet Separation Clamp with Elevated Rotation Axis
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Solution Overview
Problem
Existing apparatus for separating stacks of sheets based on tear paths often require high clamping forces, which can damage sheets and result in inefficient operation, especially when dealing with varying pile heights and small stack lengths, leading to suboptimal yield and increased energy consumption.
Innovation Solution
An apparatus with adjustable clamps that rotate about an axis positioned above the sustaining point, allowing for controlled separation of sheets by adjusting the distance between the axis and sustaining point based on pile height, minimizing damage and optimizing operation efficiency regardless of pile thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high clamping forces are applied to prevent slippage and achieve breaking, then the sheets can be separated effectively, but the sheets positioned near the upper and lower sides of the pile are damaged by compression and imprints occur on their surfaces
Solution Approach 1:
The patent changes the geometric parameters of the clamp structure, specifically positioning the rotation axis above the sustaining surface rather than below it. This parameter change modifies the force distribution during rotation, reducing compression on outer sheets while maintaining effective tear path breaking. The distance between the axis and sustaining surface is optimized to balance clamping effectiveness with sheet protection.
2Force
If the stack height is kept small to maintain machine capabilities within reasonable force limits, then excessive breaking forces are avoided, but the maximum height of stacks that can be broken is limited
Solution Approach 1:
The patent employs dynamic clamping during the breaking process. The clamps are applied to the pile before breaking, maintained during the breaking operation, and then removed. This dynamic approach allows the system to handle varying stack heights effectively, as the clamps provide necessary stability during breaking while not permanently constraining the stack structure.
3Stability of the object's composition
If significantly large clamping forces are applied to prevent slippage between sheets and clamp surfaces, then sheets can be held fixed during breaking, but the sheets near the clamps are damaged by the high compression forces
Solution Approach 1:
The patent modifies the geometric parameters of the clamp system by positioning the rotation axis above the sustaining surface. This parameter change creates a more favorable force distribution during rotation, reducing the clamping force required to prevent slippage while minimizing compression damage to outer sheets. The optimized geometry achieves both stability and sheet protection.
Data Source
AI summary
Apparatus for separating a stack of sheets from a pile of sheet material that is arranged so that tear paths of a plurality of sheets form a tear surface includes a first clamp for clamping the pile at a first side of the tear surface and a second clamp for clamping the pile at a second side of the tear surface. At least the first clamp includes a sustaining member having at least one sustaining point for supporting the pile, and an upper member having at least one contact point for contacting the pile. Rotation of the first clamp relative to the second clamp brings about the separation of a stack of sheets from the pile of sheet material by breaking the tear paths present in the tear surface.