Rotation Axis Retention Device for Flat Blank Forming
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Solution Overview
Problem
Existing packaging processes face challenges in efficiently forming containers from open flat blanks due to difficulties in movement and retention, leading to local deformations and damage, as well as the need for complex and bulky retention devices that compromise productivity and speed.
Innovation Solution
A retention device with a first and second gripping portion, where the second gripping portion is rotated with respect to the first about a virtual rotation axis external to the device, allowing for simultaneous retention and movement of the blank, minimizing deformations and enabling efficient pre-folding and forming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional retention devices are used to retain and move flat blanks, then the blanks can be held during processing, but the blanks suffer from local deformations and damage due to compressions and tractions induced by the devices
Solution Approach 1:
The retention device is divided into multiple independent gripping portions (first gripping portion, second gripping portion, third gripping portion) that can retain different parts of the blank simultaneously. Each gripping portion can be independently positioned and controlled, allowing distributed retention forces that minimize localized stress concentrations and deformations on the blank material.
Solution Approach 2:
The gripping portions are configured to move along with the blank during processing operations. The retention device dynamically adjusts its gripping positions and movements to follow the blank's trajectory, ensuring continuous retention without inducing harmful static compressions or tractions. The gripping portions can move in coordination with the blank's folding and forming operations.
2Reliability
If complex retention devices are used to securely retain blanks during movement, then retention reliability improves, but the devices become bulky and compromise productivity and speed
Solution Approach 1:
The retention device is designed with multiple gripping portions that can simultaneously retain different parts of the blank, providing multi-functional retention capability. The same gripping portions can adapt to retain blanks in various orientations and during different processing stages (transport, folding, forming), eliminating the need for multiple separate retention mechanisms and reducing overall device complexity while maintaining high retention reliability.
Solution Approach 2:
The gripping portions utilize flexible retention elements (such as suction cups or flexible grippers) that can conform to the blank surface and provide secure retention with minimal force. These flexible elements can adapt to the blank's shape changes during folding and forming operations, maintaining reliable retention without requiring bulky rigid mechanical structures, thereby enabling faster processing speeds.
3Ease of manufacture
If separate steps are used for forming semi-finished products from blanks, then processing completeness is achieved, but the process flow becomes complex and productivity is reduced
Solution Approach 1:
The retention device integrates multiple processing functions into a single unified system. The same gripping portions that retain the blank during transport also facilitate folding operations and transitioning to semi-finished product configuration. By combining retention, transport, and forming assistance functions into one device, the process flow is simplified while maintaining complete processing capability, thereby improving productivity without sacrificing manufacturing quality.
Data Source
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AI summary
A retention device (1) for retaining blanks (200) comprising a support (5), a first gripping portion (10) which is secured to said support (5) and which is provided with first retention elements (11a) of said blank (200), a second gripping portion (20) which is secured to said support (5) or to said first gripping portion (10) and which is provided with second retention elements (21a) of said blank (200), a movement mechanism (50) for said second gripping portion (20) with respect to said first gripping portion (10), which movement mechanism (50) is configured to carry out a pure rotation of said second gripping portion (20) about a virtual rotation axis (V) which is located outside said retention device (1).