Collation Edge Alignment via Variable Sheet Length Cutting
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Solution Overview
Problem
Existing mailpiece inserter systems face challenges in producing high-quality multi-sheet collations, particularly when folding thicker stacks, as they often result in skewed or misaligned edges, requiring additional costly trimming operations to achieve edge registration.
Innovation Solution
A system comprising a cutting device, accumulating device, registration device, and processor that adjusts the length of each sheet based on its position within the collation to ensure edge alignment after folding, eliminating the need for subsequent trimming operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional uniform sheet stacking is used to form collations, then the manufacturing process is simple, but the edges become misaligned after folding thicker stacks
Solution Approach 1:
The patent applies local quality by making each sheet in the collation have a different length based on its position. Outer sheets are made longer than inner sheets to compensate for the offset created during folding. This localized variation in sheet dimensions ensures that all edges align perfectly after the folding operation, resolving the edge alignment problem without requiring complex post-processing equipment.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and pre-cutting each sheet to its specific required length before the collation is formed. The system determines the optimal length for each sheet based on its position in the stack and the fold configuration, then cuts the sheets accordingly before stacking. This preliminary preparation eliminates the need for trimming operations after folding, as the sheets are already sized correctly for edge alignment.
2Manufacturing precision
If additional trimming operations are added to achieve edge registration, then manufacturing precision improves, but productivity decreases
Solution Approach 1:
The patent eliminates productivity loss by performing the edge alignment preparation in advance during the sheet cutting stage. Each sheet is pre-cut to its specific length required for perfect edge registration after folding. This preliminary action removes the need for subsequent trimming operations, maintaining high production speed while achieving precise edge alignment, thus resolving the contradiction between manufacturing precision and productivity.
3Manufacturing precision
If outer sheets are made longer than inner sheets, then edge alignment after folding is achieved, but the cutting precision requirements increase
Solution Approach 1:
The patent employs feedback mechanisms through its control system that automatically calculates and adjusts the specific length required for each sheet based on its position in the collation and the fold configuration. The system uses feedback loops to ensure that the length variations between sheets are precisely controlled within tight tolerances. This automated feedback control enables the system to manage the increased measurement precision requirements while achieving perfect edge alignment after folding.
Data Source
AI summary
A system for preparing a collation of sheets for a subsequent folding operation wherein edges of the collation are aligned to eliminate the need for additional trimming operations. The system comprises: a cutting device operative to cut each sheet of the collation based upon a length dimension of each of the inner and outer sheets, an accumulating device operative to stack the sheets to form the collation, a registration device operative to register at least one edge of the collation, a conveyance device for transporting the sheet material along a feed path to the cutting, accumulating and registration devices, and a processor operatively coupled to, and controlling, the cutting, accumulating, registration and conveyance devices.