Sheet Stacking Guide Limits Deflection
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Solution Overview
Problem
High-speed copying and printing machines struggle to stack sheets of varying materials, such as thin and thick papers, due to curling or limpness, which causes the pusher element to deflect and not straighten the sheets effectively against a stop, leading to bending and damage.
Innovation Solution
A method and device that utilize a guide to limit the sheet's freedom of movement perpendicular to the pushing direction, ensuring the sheet is aligned and moved against the stop, with the guide being controlled by the pusher element or an electric drive, and adjustable to accommodate different stack heights, minimizing damage and handling a wide range of materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pusher element is used to move sheets against a stop, then sheets can be stacked for after-treatment, but curled or limply hanging sheets cannot be effectively straightened and are mainly bent
Solution Approach 1:
A guide element is introduced as an intermediary between the pusher element and the sheet. The guide element has a guide surface that cooperates with a corresponding surface on the sheet, creating a guided movement path that prevents deflection and ensures the sheet is properly positioned against the stop during pushing.
Solution Approach 2:
The guide element changes the movement parameters of the sheet by constraining its freedom of movement. The guide surface controls the sheet's position and orientation, transforming uncontrolled deflection into controlled guided movement, ensuring reliable stacking regardless of sheet curl or limpness.
2Productivity
If sheets of varying materials are processed at high speed, then productivity increases, but sheets may curl or hang limply due to temperature and moisture conditions
Solution Approach 1:
The guide element serves as a mediator that stabilizes sheet movement during high-speed processing. By providing a controlled guide path, it compensates for sheet instability caused by temperature and moisture variations, maintaining stacking reliability regardless of environmental conditions or processing speed.
3Force
If the pusher element acts on curled sheets, then sheets can be moved, but the sheets are mainly bent and hardly moved against the stop
Solution Approach 1:
The guide element acts as an intermediary that redirects the pushing force from the pusher element. Instead of allowing the force to cause sheet bending, the guide surface channels the force along a controlled path, ensuring the sheet is pushed accurately against the stop with proper positioning.
Solution Approach 2:
The guide element changes the force application parameters by constraining the sheet's movement degrees of freedom. This transforms ineffective bending forces into effective positioning forces, improving sheet placement accuracy while maintaining the pushing action.
Data Source
AI summary
A method and device for forming a stack of sheets including a delivery surface, and also a stop and a pusher element movable in the direction of the stop, and also a guide which can occupy a first and a second position, in which the first position a sheet can be received in the guide, and in which the second position a guide path is formed, wherein the freedom of movement of the sheet edge is substantially limited in a direction substantially perpendicular to the pushing direction and substantially perpendicular to the delivery surface of the preceding sheet.