Starwheel Paper Sheet Stack Transfer Mechanism
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Solution Overview
Problem
Existing machines for producing stacks of folded paper sheets lack flexibility and efficiency, requiring separate machines for producing large and small stacks, and are prone to product damage during handling and transportation due to complex and slow conveyor systems.
Innovation Solution
A machine with a starwheel unit that can rotate and translate stacks from a formation table to a conveyor belt, allowing for continuous production of both large and small stacks without structural changes, and featuring a rotation mechanism to change the stack axis from vertical to horizontal or vice versa, ensuring smooth handling and reduced risk of damage during transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple parallel conveyors are used to increase production rate, then productivity increases, but device complexity and product damage risk increase due to multiple direction changes
Solution Approach 1:
The patent merges multiple conveyor functions into a single conveyor belt by incorporating a rotation mechanism that can reorient stacks mid-transport. This eliminates the need for multiple parallel conveyors and their associated direction changes, reducing system complexity while maintaining high productivity through continuous operation.
Solution Approach 2:
The conveyor system incorporates a dynamic rotation mechanism that can change the orientation of stacks during transport. This dynamic adjustment allows a single conveyor to perform what previously required multiple static conveyors, simplifying the overall system while enabling continuous high-rate production.
2Productivity
If multiple parallel conveyors are used to increase production rate, then productivity increases, but product damage increases due to sudden direction variations
Solution Approach 1:
The rotation mechanism integrated into the conveyor provides smooth, continuous orientation changes rather than sudden direction variations. This dynamic adjustment during transport minimizes mechanical shocks and handling stresses on the stacks, reducing product damage while maintaining high production rates.
3Quantity of substance
If starwheel units are configured for bulk stacks, then large stack production is achieved, but adaptability to produce flat stacks requires separate machine configuration
Solution Approach 1:
The starwheel unit is designed with universal functionality to produce both bulk stacks and flat stacks. By integrating the rotation mechanism, the same starwheel configuration can deliver stacks in different orientations suitable for either bulk or flat packaging, eliminating the need for separate machine configurations and improving adaptability.
Solution Approach 2:
The dynamic rotation mechanism allows the starwheel unit to adapt its output orientation on-the-fly. The same physical configuration can produce bulk stacks delivered horizontally or flat stacks delivered vertically, providing production flexibility without requiring structural changes or separate machine settings.
4Ease of operation
If complex conveyor systems with multiple direction changes are used, then stack transport is achieved, but handling time increases reducing efficiency
Solution Approach 1:
By merging multiple conveyor sections into a single continuous belt with an integrated rotation mechanism, the system eliminates intermediate transfer points and direction changes. This reduces handling time and improves operational efficiency while maintaining the ability to transport stacks effectively.
Data Source
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AI summary
Machine (1) for converting paper comprising a starwheel unit (10) equipped with at least one cylindrical body having a plurality of grooves (15), each of which is configured to receive a respective sheet (11) of a plurality of folded sheets (11) that are carried in turn, for example between two transmission belts (200, 201), along a feed¬ ing direction (101), for example a direction substantially tangential to the starwheel unit (10). The starwheel unit rotates about a rota¬ tion axis (110), for example in a counterclockwise direction, and dis¬ charges in turn the sheets (11) present in the grooves (15) onto a formation table (20, 120). More precisely, the folded sheets are dis¬ charged to achieve a predetermined angular release position, in order to form a stack (50) of folded sheets (11). The machine (1) can com¬ prise a transfer means for transferring the formed stacks (50) from the table (20, 120) to said conveying means (30). The transfer means comprises a rotation means (60) arranged to transfer the stack (50) of folded sheets (11) from the table (20) to the conveying means (30) through a rotation of a predetermined angle.