Clamping Device with Additional Jaws for Bag Section Tensioning
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Solution Overview
Problem
Existing clamping devices in sack filling systems often result in creases during the filling process, leading to mechanical stress and potential voids in the bag section, which can cause issues with gripping and transport safety, and require significant effort to operate effectively.
Innovation Solution
A clamping device with additional jaws that provide an additional clamping section below the primary clamping section, allowing for defined positioning and tensioning of the sack section to prevent creases, and enabling the clamping device to operate with reduced cycle time by allowing the additional jaws to open before the filling process is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gripping device grips the bag section from the side below the clamping jaws, then transport after filling is enabled, but creases and folds form in the film layer leading to mechanical stress and potential voids
Solution Approach 1:
The clamping device is divided into two independent clamping units: a first clamping jaw assembly with first and second clamping jaws for primary clamping, and a second clamping jaw assembly with third and fourth clamping jaws for secondary clamping. This segmentation allows each unit to independently control the bag section at different locations, preventing film layer creases while enabling reliable transport.
Solution Approach 2:
The second clamping jaw assembly acts as an intermediary between the first clamping jaw assembly and the gripping device. It provides an additional clamping point that stabilizes the bag section and prevents unwanted displacement during gripping, thereby eliminating creases and folds that would otherwise form in the film layer.
2Reliability
If clamping force is increased to prevent bag section displacement during filling, then filling position stability is improved, but the cycle time of the filling station increases
Solution Approach 1:
The second clamping jaw assembly is positioned and ready to clamp the bag section before the filling process begins. This preliminary action ensures that the bag section is already stabilized at the correct filling position, eliminating the need for increased clamping force during filling and allowing the cycle to proceed without time loss.
Solution Approach 2:
The clamping jaws are designed with independent actuation capability, allowing the first and second clamping jaw assemblies to operate at different times and with different forces. The first assembly provides initial clamping for positioning, while the second assembly provides additional stabilization, enabling dynamic force distribution that maintains stability without extending cycle time.
3Device complexity
If a single clamping jaw assembly is used, then device complexity is reduced, but the risk of creases and mechanical stress increases
Solution Approach 1:
The clamping device is segmented into two independent jaw assemblies with separate clamping zones. The first assembly clamps the upper portion of the bag section while the second assembly clamps the lower portion, distributing the clamping force and preventing concentration of stress that would cause creases and folds in the film layer.
Solution Approach 2:
Each clamping jaw assembly is designed to apply clamping force at specific local zones of the bag section. The first assembly targets the upper region for initial positioning, while the second assembly targets the lower region for additional stabilization, creating locally optimized clamping conditions that prevent mechanical stress without requiring a overly complex overall structure.
Data Source
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AI summary
The invention relates to a clamping device (10) for clamping a bag section (210) of a film web (200) in a filling station (110) of a bag filling machine (100), comprising a first clamping jaw (22) and a second clamping jaw (24) movable relative to the first clamping jaw (22) for clamping the bag section (210) in a clamping section (26) in its head region (212), wherein a first additional jaw (32) is movably mounted on the first clamping jaw (22), and wherein a second additional jaw (34) is arranged on the second clamping jaw (24) for clamping the bag section (210) in an additional clamping section (36) below the clamping section (26).