Tractor Drive Transport Assembly for 3D Composite Sheet Stacking
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Solution Overview
Problem
Current additive manufacturing processes for cutting and stacking web-fed substrate materials into sheared and stacked individual sheets are inefficient, often requiring separate support structures and manual removal of excess material, which increases waste and reduces productivity.
Innovation Solution
A web sheet processing system incorporating a tractor drive transport assembly with a drive belt and registration pin, and a drive guide, which aligns and releases composite printed sheets onto a stacker subsystem, eliminating the need for separate support structures and minimizing waste by integrating excess material into the 3D object stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional manual sheeting and stacking processes are used, then operational flexibility is maintained, but productivity is reduced and material waste increases
Solution Approach 1:
The automated sheeting and stacking system performs operations that would otherwise require manual intervention. The tractor drive transport assembly automatically feeds substrate webs through the imaging process, and the stacker subsystem automatically stacks processed sheets, eliminating the need for manual sheeting and stacking operations.
Solution Approach 2:
The patent replaces manual mechanical operations with an automated mechanical system. The tractor drive transport assembly uses a drive belt with knobs to mechanically advance substrate webs, while the stacker subsystem uses mechanical components to automatically stack sheets, replacing manual handling operations.
2Reliability
If separate support structures are used for substrate webs, then structural stability is improved, but device complexity and material waste increase
Solution Approach 1:
The substrate web itself serves multiple functions: it provides structural support for the deposited material, acts as a carrier through the imaging process, and becomes part of the final stacked product. This eliminates the need for separate support structures that would add complexity and require manual removal.
Solution Approach 2:
The patent merges the substrate web with the final product by eliminating separate support structures. The substrate web is integrated into the stacked layers, becoming an intrinsic part of the finished object rather than a temporary support that must be removed.
3Manufacturing precision
If excess substrate material is removed manually, then manufacturing precision is maintained, but loss of time and productivity increase
Solution Approach 1:
The automated sheeting and stacking system operates continuously without interruption for manual material removal. The tractor drive transport assembly continuously feeds substrate webs, and the stacker subsystem continuously stacks processed sheets, eliminating downtime associated with manual excess material removal.
Solution Approach 2:
The system automatically handles the complete sheeting and stacking process without requiring manual intervention for material removal. The automated detection and stacking mechanisms perform functions that would otherwise require operators to manually measure, cut, and stack sheets.
4Productivity
If automated sheeting and stacking is implemented, then productivity is improved, but the need for precise alignment mechanisms increases device complexity
Solution Approach 1:
The stacker subsystem automatically detects and aligns sheets using the tractor feed apertures and registration apertures as built-in alignment features. The system self-aligns sheets by engaging these pre-existing apertures with corresponding pins and guides, eliminating the need for complex external alignment mechanisms.
Solution Approach 2:
The registration apertures and tractor feed apertures serve as intermediary alignment features that facilitate automatic sheet positioning. These apertures act as mediators between the substrate web and the stacker subsystem, enabling precise alignment without complex mechanical adjustment mechanisms.
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 system enhances the speed and efficiency of the additive manufacturing process by automating the alignment and stacking of printed sheets, reducing waste and the need for manual handling, thereby improving productivity and reducing material waste.
Implementation Method 1
The drive belt is configured to pull the composite printed sheet over the stacker subsystem... The plurality of knobs is spaced to align with and protrude a plurality of tractor feed apertures
Implementation Method 2
a registration pin extending upwards from the base... until a registration aperture of the composite printed sheet is in alignment over the registration pin
Implementation Method 3
The drive guide is configured to temporarily support the composite printed sheet while the composite printed sheet is pulled over the stacker subsystem
Data Source
AI summary
A web sheet processing system for cutting and/or stacking AM composite printed sheets from the web combines web edge waste with the cut sheets, stacking the waste with the 3D object. The waste may be removed during the cleaning of the 3d object (e.g., by abrasive blasting, chemical removal, dissolution) to result in a 3D printed object. This approach eliminates the separate need for waste removal of a rewound web of substrate material waste. In examples, a tractor drive transport assembly ensures consistent web/sheet motion via tractor feeding along the edges of the web/sheet to a stacker subsystem. The tractor drive transport assembly, in combination with a drive guide, positions the cut sheets over the stacker subsystem for release onto the top of a stack, with the substrate waste that would normally be processed downstream stacked with the 3D object for removal during a normal cleaning of the object.