Film Delivery Device Hinged Assembly for Wrapping Film
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Solution Overview
Problem
Existing film delivery devices face difficulties in threading film, especially when changing rolls near the floor level, due to complex and costly joint structures required for high prestretching, and previous solutions either lack S-threading's friction advantage or complicate the prestretch system, leading to inefficient film wrapping and increased production costs.
Innovation Solution
A film delivery device with a second assembly hinged at the lower end to allow easy film insertion from above, utilizing S-threading with deflecting rollers that provide a large contact surface and simplify the force transmission without additional joints, enabling easy film loading and prestretching while maintaining a lightweight and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the second assembly is hinged at the upper end to allow the second prestretch roller to pivot, then the structure can accommodate high prestretching forces, but the structure becomes complex, expensive and vulnerable to malfunction
Solution Approach 1:
The patent inverts the conventional hinging location from the upper end to the lower end of the second assembly. This inversion allows the prestretch rollers to maintain close spacing for effective prestretching while eliminating the need for complex upper hinge joints. The lower hinge placement simplifies the structure by reducing the number of joints and their associated complexity, while still accommodating the forces through the frame design.
2Productivity
If the second prestretch roller is spaced apart from the first prestretch roller in the closed position, then the prestretching effectiveness is improved, but the threading difficulty increases when changing rolls near floor level
Solution Approach 1:
The patent employs dynamic positioning of the second assembly through lower-end hinging, allowing it to pivot between open and closed positions. In the closed position, the second prestretch roller spacing is optimized for effective prestretching. In the open position, the assembly pivots to create adequate clearance for easy film threading from above, regardless of the machine's height. This dynamic adjustment resolves the contradiction between prestretching effectiveness and threading ease.
3Ease of operation
If the second assembly is opened to create a gap for film insertion, then the film loading becomes easier, but the distance between prestretch rollers increases reducing friction surface area
Solution Approach 1:
The dynamic pivoting mechanism allows the second assembly to be in different positions: open for loading and closed for operation. When opened, the gap between prestretch rollers increases to allow easy film insertion from above. When closed for the prestretching operation, the rollers return to their optimal close spacing, restoring the large friction surface area needed for effective prestretching. This temporal separation of functions resolves the contradiction.
4Force
If the hinge joint is dimensioned to be large to hold heavy loads, then the load-bearing capacity is improved, but the structure becomes more complex and expensive
Solution Approach 1:
By inverting the hinge location to the lower end and redesigning the force transmission path through the frame, the patent reduces the complexity of the joint structure. The frame elements are designed to transmit forces efficiently from the prestretch rollers through the hinge to the ground, allowing for simpler, more compact joint dimensions while maintaining adequate load-bearing capacity. This eliminates the need for oversized, complex joints.
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
Facilitates easy film threading and loading by allowing insertion from above, maintains a large friction surface for effective prestretching, and reduces structural complexity and costs by eliminating the need for complex joint systems, ensuring efficient film wrapping and handling of heavy loads.
Implementation Method 1
the first prestretch roller engages in frictional contact with the first face of the wrapping film and the second prestretch roller engages in frictional contact with the second face of the wrapping film
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A film delivery device comprising a first assembly (4) which can be connected to a wrapping machine and a second assembly (5) which is pivoted to turn, relative to the first assembly (4), about a horizontal hinge axis (6) between a closed position (I) and an open position (II). A first prestretch roller (7) is in the first assembly (4). A second prestretch roller (8) is in the second assembly (5). The film can be threaded by S-threading between the prestretch rollers (7, 8). The second assembly (5) is hinged at the lower end to the lower end of the first assembly (4) to turn about said horizontal hinge axis (6). The second assembly (5) comprises a pivoted and spring-loaded first deflecting roller (22) which is arranged downstream relative to the first prestretch roller (7). In the open position (II) of the second assembly (5), that part of the first deflecting roller (22) which is close to the lower end thereof is resting against the surface of the first prestretch roller (7).