Stack Cutting Device Segmentation for Precision Alignment
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Solution Overview
Problem
Existing methods for cutting sheet-shaped goods, such as securities, face challenges in achieving high precision while avoiding deformation due to gripping pressure, which requires constant alignment checks and adjustments.
Innovation Solution
A method and device using a pressure element that applies force across the surface of the stack during cutting, allowing the gripping element to be inactive, with a variable pressure element and a robot arm connected to the pressure element for precise alignment and movement, minimizing deformation and the need for frequent readjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stack is continuously gripped by gripping devices during movement and cutting, then alignment precision is maintained, but deformation of the stack occurs due to pressure exerted on the stack by the gripping devices
Solution Approach 1:
The handling device is segmented into two independent functional components: a pressure element for applying distributed pressure to prevent sheet shifting, and gripping elements for alignment and movement. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between maintaining alignment precision and preventing stack deformation.
Solution Approach 2:
The pressure element acts as an intermediary between the gripping elements and the stack. Instead of the gripping elements directly contacting and clamping the stack edges (which causes deformation), the pressure element mediates by distributing pressure across the stack surface, preventing sheet shifting without causing deformation.
2Manufacturing precision
If gripping elements are used to align the stack with the cutting line, then alignment is achieved, but frequent alignment checks and adjustments are required
Solution Approach 1:
The pressure element is positioned to apply pressure on the stack before the cutting operation begins. This preliminary action stabilizes the stack in the desired position and orientation, ensuring that alignment is maintained throughout the cutting process without requiring frequent checks and adjustments.
3Manufacturing precision
If pressure is applied to the stack during cutting to prevent shifting, then cutting precision is improved, but deformation may occur if pressure is applied over a small area
Solution Approach 1:
The pressure element is designed with a large surface area that distributes pressure locally across the stack surface rather than concentrating it at point contacts. This local quality approach ensures sufficient pressure to prevent sheet shifting during cutting while avoiding deformation by distributing the force over an adequate area.
Data Source
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AI summary
The invention relates to a method and a device for handling a stack (10) of sheet-shaped material, comprising the process steps of aligning the stack in a first state onto a cutting line of a cutting blade of a cutting device (14), gripping the stack and aligning the stack onto the cutting line in a second state, and cutting the stack, wherein the stack is gripped by means of at least one gripping element (38, 40) for the purpose of aligning it. During cutting, the stack (10) is acted upon by a pressure element (28) while the at least one gripping element (38, 40) is simultaneously ineffective, and the pressure element is spaced apart from the stack during the alignment of the stack while the stack is simultaneously gripped by the at least one gripping element.