Stretch Wrapping Film Cutting Drag Plate Elastic Engagement
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Solution Overview
Problem
Existing film clamping and cutting devices in stretch wrapping machines face issues with elastic fatigue leading to reduced force transmission, causing the rotatable block to slide out, resulting in incomplete film cutting and increased manufacturing costs due to complex and space-consuming components.
Innovation Solution
A film clamping and cutting device with a turntable, braking unit, and drag set that includes a rotatable block connected to a central shaft, an elastic part, and a clip space with an elastic body, ensuring the shaft remains engaged until the film is precisely clamped and cut, integrating the film guiding rod with the cutting rod for reduced costs and improved assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shaft of the rotatable block is directly against the curved sliding surface, then the movement becomes smoother, but the shaft easily slides out when elastic fatigue occurs
Solution Approach 1:
The patent introduces an elastic component (elastic element or spring) between the shaft and the curved sliding surface to compensate for dimensional changes and maintain reliable engagement. This elastic cushioning prevents the shaft from sliding out when elastic fatigue occurs in the drag plate, while still allowing smooth movement during normal operation.
2Manufacturing precision
If the film guiding member including film guiding rod and connection rod is used, then the distance between film and objects is increased benefiting cutting process, but the manufacturing cost is increased and components are complex
Solution Approach 1:
The patent integrates the film guiding function into the existing drag plate structure. The drag plate itself is designed to guide the film while maintaining the necessary distance for precise cutting, eliminating the need for separate film guiding rods and connection rods. This merging of functions reduces component count and simplifies the overall structure while maintaining cutting precision.
3Manufacturing precision
If multiple separate components are used for film guiding, then film positioning is improved, but assembly complexity increases and components easily fall off
Solution Approach 1:
The patent combines film guiding, film positioning, and drag functions into a single integrated drag plate structure. This eliminates multiple separate components that could fall off during assembly or operation, while maintaining accurate film positioning through the designed geometry of the integrated structure.
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
Ensures precise film cutting and wrapping while reducing manufacturing costs and assembly complexity by maintaining the shaft's engagement until the cutting position is reached, ensuring complete film removal and integration of components.
Implementation Method 1
The clip space is mounted with an elastic body while two ends of the elastic body are respectively connected to the drag plate and the clip
Implementation Method 2
An elastic part is disposed between the rotatable block and the film clamping and cutting rod
Data Source
AI summary
A film clamping and cutting device of stretch wrapping machines is revealed. A film clamping and cutting unit and a drag set used as an auxiliary are disposed on a turntable. The drag set includes a rotatable block which is connected to an assembly wheel of the film clamping and cutting unit. The rotatable block is connected to a shaft clipped in a clip space formed between a drag plate and a clip. An elastic body is assembled between the drag plate and the clip. By way of the drag plate, the clip and the elastic body, the shaft connected to the rotatable block is not released from the clip space until a film clamping and cutting rod and a clamp reach certain positions. Thus a connection rod disposed on the rotatable block drives the clamp to clip film timely so as to clamp and cut the film precisely.