Sleeve Extractor for Rotary Tool Conversion Units
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Solution Overview
Problem
The existing rotary-tool systems for converting flat substrates are time-consuming and costly due to the weight and expense of cylindrical tools, requiring frequent tool changes and being inefficient in thermal management, which complicates sleeve extraction from mandrels.
Innovation Solution
A rotary-tool sleeve extractor with a base and movable extraction head, featuring a gripper and actuator system that automatically engages and pushes the sleeve along the mandrel, suitable for various diameters, allowing for easy and efficient removal of sleeves from the conversion unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the entire rotary tool (cylinder) is changed, then the conversion capability is complete, but the weight is high (50-2000 kg) and tool change time is long
Solution Approach 1:
The rotary tool is divided into two segments: a permanent mandrel and a removable sleeve. The mandrel remains in the machine while only the sleeve is changed. This segmentation reduces the weight of the removable component from 50-2000 kg to a much lighter sleeve, enabling faster tool changes while maintaining full conversion capability through sleeve replacement.
Solution Approach 2:
The functional conversion elements (forms, reliefs, cutting edges) are extracted from the heavy cylinder and placed on removable sleeves. This allows the heavy mandrel to stay in place while only the lightweight sleeves are removed and replaced, dramatically reducing tool change time and effort.
2Manufacturing precision
If the sleeve dimensions are reduced to limit play during conversion, then the conversion precision is improved, but the sleeve cools down more quickly when the unit stops, making removal difficult
Solution Approach 1:
A threaded extraction mechanism acts as an intermediary between the operator and the sleeve. The extraction head with threaded engagement provides mechanical advantage to overcome the tight fit caused by thermal contraction, enabling easy sleeve removal despite the tight tolerances needed for precision conversion.
Solution Approach 2:
The manual extraction process is replaced with an automated threaded extraction mechanism. The extraction head engages with threads on the sleeve and uses a motorized screw mechanism to automatically pull the sleeve off the mandrel, eliminating the need for manual force or special tools.
3Adaptability or versatility
If frequent tool changes are made to produce different boxes, then the production flexibility is improved, but the cost increases due to numerous expensive tools needing to be ordered in advance
Solution Approach 1:
A single mandrel can accommodate multiple different sleeves, each designed for a specific box type. This universal mandrel design allows one base component to serve multiple functions by simply changing the sleeve, reducing the total number of tools needed and eliminating the need to order specialized heavy cylinders for each product variant.
Solution Approach 2:
The sleeves are designed as inexpensive, replaceable components compared to full cylinders. When a sleeve wears out or becomes obsolete, it can be replaced with a new or different sleeve without replacing the entire expensive mandrel assembly, reducing overall tooling costs and enabling frequent changes.
Data Source
AI summary
A rotary-tool sleeve extractor for a unit for converting a flat substrate that includes a base (23) intended to be fixed to the conversion unit (7) and an extraction head (24) that: a) is movable with respect to the base (23) between a withdrawn position and a deployed position and, b) has a gripper (25) that can engage with a sleeve (13) of a rotary tool (10, 11).