Folder Feeder Tracing Wheel Crease Depth Control
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Solution Overview
Problem
Existing folder feeders struggle to produce high-quality folds consistently, especially under high output conditions, due to uneven creasing wheel operation caused by unbalancing forces, shape irregularities, or eccentric movements, leading to incomplete or open folds in print products like brochures and magazines.
Innovation Solution
A folder feeder design featuring a first creasing wheel positioned on a tracing wheel that maintains a constant distance from the drum's surface, balancing out any untrue running or eccentricity of the second creasing wheel, ensuring uniform crease depth and stability, with adjustable features like an eccentric cam and Bowden wire for precise adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high output operation is performed, then productivity increases, but the creasing wheel experiences unbalancing forces causing untrue running and non-uniform crease depth
Solution Approach 1:
The patent introduces a tracing wheel as an intermediary element between the first creasing wheel and the drum. The tracing wheel runs on the circumferential surface of the drum and maintains a constant distance, effectively balancing out unbalancing forces and untrue running during high-speed operation. This mediator transfers the motion from the drum to the creasing wheel while compensating for vibrations and eccentricities, ensuring uniform crease depth even at high productivity levels.
2Manufacturing precision
If the first creasing wheel is pressed against the second creasing wheel to ensure uniform groove depth, then manufacturing precision improves, but device complexity increases due to additional tracing wheel mechanism
Solution Approach 1:
The patent replaces a complex direct pressing mechanism with a simpler tracing wheel system. Instead of using a complicated mechanical linkage to maintain constant pressure and position, the tracing wheel simply rolls on the drum surface, naturally maintaining a constant distance through its geometry. This substitution of the mechanical pressure transmission system with a rolling contact system reduces complexity while achieving the same precision goal.
3Ease of manufacture
If production tolerance requirements are reduced to lower costs, then manufacturing cost decreases, but maintaining tight crease depth control becomes more difficult
Solution Approach 1:
The tracing wheel system is designed to automatically compensate for variations and maintain uniform crease depth without requiring external control mechanisms or frequent manual adjustments. The constant distance between the tracing wheel and drum surface is self-maintained through the rolling contact geometry, making the system self-regulating. This self-service capability ensures tight crease depth control is achieved naturally, reducing the need for expensive tolerance control measures.
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
This solution enables the production of high-quality folds across varying sheet weights, reduces production tolerance requirements, and lowers costs by ensuring consistent crease depth and operational safety, even during high-output operations.
Implementation Method 1
a tracing wheel positioned at least axis parallel with the first creasing wheel and running on the circumferential surface of the drum
Implementation Method 2
The first creasing wheel is positioned on a tracing wheel, which moves on the second creasing wheel and is pressed with a spring force against a running surface of the second creasing wheel
Data Source
AI summary
A folder is adapted to fold sheets. A drum having a circumferential surface is adapted to withdraw sheets from a stack or from an overlapping flow and feed the sheets to the folder. A creasing apparatus is operatively arranged with the drum and includes: a first creasing wheel which cooperates with the drum to crease the withdrawn sheets that are fed to the folder, and a tracing wheel positioned at least axis parallel with the first creasing wheel and running on the circumferential surface of the drum to maintain a constant distance between the first creasing wheel and the circumferential surface of the drum.