Wrapping Device Unwinder Orbit Control for Variable Product Geometry
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Solution Overview
Problem
Existing wrapping devices face high construction and operating costs, lack flexibility, and struggle to maintain tension in packaging materials for products of varying dimensions and geometries, leading to potential material collapse and inefficiencies.
Innovation Solution
A wrapping device with a freely selectable orbit for the unwinder, controlled via a process computer, utilizing two separate movement systems that allow for optimal adaptation to product contours, enabling constant tension and efficient wrapping of diverse product geometries without unnecessary material stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rigid rectangular winding frame with fixed profile guidance is used, then the structure is simple and robust, but the device cannot adapt to products of varying dimensions and geometries, and cannot maintain constant film tension
Solution Approach 1:
The patent applies dynamics by replacing the fixed rigid profile guidance with a dynamic system where the unwinder moves along a programmable orbit. The movement system allows the unwinder to follow custom paths adapted to different product geometries, enabling constant film tension through controlled motion rather than rigid mechanical constraints.
Solution Approach 2:
The patent changes the parameter of the unwinder's movement path from fixed to variable. The orbit can be programmed and adjusted according to different product dimensions and shapes, allowing the same device to adapt to various wrapping scenarios by changing motion parameters rather than physical structure.
2Device complexity
If the unwinder is moved alternately on horizontal and vertical transfer assemblies in a closed circuit with sharp braking and acceleration, then the transfer mechanism is simple, but constant film tension cannot be maintained
Solution Approach 1:
The patent replaces sharp braking and acceleration with continuous, smoothly controlled motion along a programmed orbit. The unwinder moves dynamically with controlled velocity and acceleration profiles that maintain constant film tension, eliminating the reliability issues of abrupt directional changes while keeping the transfer mechanism relatively simple.
3Adaptability or versatility
If a divisible guide is used to pass through openings in the body, then the unwinder can be controlled through openings, but the machine technology outlay is considerable and flexibility is reduced
Solution Approach 1:
The patent solves the opening passage problem by changing the parameter of the unwinder's orbital path. Instead of modifying the guide structure, the system programs the unwinder to follow a path that passes through the opening at the appropriate moment, maintaining structural simplicity while achieving the desired adaptability.
4Device complexity
If the unwinder follows a fixed circulating path, then the movement system is simple, but unnecessary long circulating distances are traveled and energy consumption increases
Solution Approach 1:
The patent optimizes energy efficiency by making the orbit parameters adaptive. The unwinder follows a circulating path whose characteristics (radius, shape, length) are adjusted according to the product dimensions, eliminating unnecessary travel distances while keeping the movement system itself relatively simple.
Data Source
Figure 1
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AI summary
A wrapping device is provided with a guide for an unwinder (1) of a film web (2) from a film roll (3) to be unwound along a circular path (4) around a body (5;6) to be wrapped, as well as a working method achievable with it, which requires considerably less construction and operating effort, but exhibits great variability in wrapping bodies of any dimensions and size ratios, which is achieved by guiding at least two separate unwinders (1) each in at least two directions (x;y) motion systems (7) capable of moving, each having a controllable holding device (8) for a holding flange (9) of the unwinder (1), which has two separate holding flanges (9), the winding device having a process computer with which the guidance of the unwinder (1) along a freely definable orbit (4) can be generated and it can be transferred from one motion system (7) to the next motion system (7) after a partial revolution, so that a full revolution on the orbit (4) can be generated with the motion systems (7).;