Servomotor Cam Sealing Unit for Tubular Packaging
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Solution Overview
Problem
Existing sealing units for tubular packaging containers are complex, require multiple tools, and face challenges in reliability, repeatability, and durability, especially when sealing non-circular cross-sections, and struggle to efficiently manage the sealing process with varying packaging materials.
Innovation Solution
A form and sealing unit featuring a pair of sealing jaws controlled by a cam arrangement and a servomotor, allowing for precise movement and energy transfer, which simplifies the sealing process by isolating the control of forming and sealing from machine speed and accommodating different packaging sizes and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complex mechanical path control system is used for sealing jaws, then the sealing path can be precisely controlled, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical path control systems with a servomotor-driven cam wheel system. The servomotor provides precise rotational control, and the cam wheel converts this rotational motion into the desired sealing jaw movement path through its cam profile, eliminating the need for complex mechanical linkages while maintaining precision.
Solution Approach 2:
The patent changes the control parameter from complex mechanical linkage geometry to simple rotational position control of the cam wheel. By controlling the rotational position of the cam wheel via servomotor, the sealing path is precisely controlled through the cam profile, simplifying the control system while maintaining manufacturing precision.
2Reliability
If multiple separate tools are used for sealing and forming operations, then each operation can be optimized, but the overall device complexity increases
Solution Approach 1:
The patent merges the sealing jaw and forming tool into a single integrated unit. The sealing jaw is designed to perform both sealing and forming operations simultaneously, eliminating the need for separate tools while maintaining the reliability of each operation through optimized jaw design and motion control.
Solution Approach 2:
The sealing jaw is designed as a multi-functional tool that can perform sealing, forming, and folding operations. This universal tool approach reduces the number of separate tools needed while maintaining operational reliability through careful design of the jaw's geometry and motion characteristics.
3Productivity
If sealing jaws follow a complex movement path, then forming and folding can be initiated during approach, but the mechanical system becomes less reliable and durable
Solution Approach 1:
The patent replaces complex mechanical path control with a servomotor-controlled cam wheel system. This substitution maintains the ability to initiate forming during the approach phase while improving reliability and durability by eliminating complex mechanical linkages that are prone to wear and failure.
4Ease of operation
If a simple cam wheel driven by servomotor is used, then the device is easier to operate and more durable, but precise control of sealing jaw movement must be achieved through cam profile design
Solution Approach 1:
The patent changes the control approach from complex real-time mechanical adjustments to predetermined cam profile design. The cam profile is designed offline to provide the exact sealing jaw movement pattern needed, simplifying operation while maintaining precision through careful profile design rather than complex control mechanisms.
Data Source
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AI summary
A sealing unit for sealing and forming a packaging container is disclosed. The sealing unit operates on a principle that the motion of a pair of opposing sealing jaws is controlled by means of a cam-cam follower interaction combined with the action of a servomotor driving a cam wheel. The invention also concerns a method for calibrating a sealing unit.