Servomotor Sealing Device with Dynamic Pressure Feedback
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Solution Overview
Problem
Conventional sealing devices in packaging machines face difficulties in adjusting to different types of packaging bags, leading to inconsistent sealing pressures and times, which can result in defects such as burning or inadequate sealing, and require extensive reconfiguration and maintenance.
Innovation Solution
A sealing device with a pair of heater bars, a servomotor, a link mechanism, a storage unit, and a control unit that stores and selects specific seal patterns for various types of packaging bags, allowing for precise control of sealing pressure and time based on the bag type, reducing operator influence and simplifying maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing device uses mechanical opening/closing of heater bars synchronized with main shaft rotation, then the sealing operation is simple and reliable, but it is difficult to detect defective biting of the heater bars and requires extensive reconfiguration when changing packaging bag types
Solution Approach 1:
The patent introduces a sensor that detects the position of the heater bars during closing operation and provides feedback to the control unit. The control unit compares the detected position with the target position to determine whether defective biting has occurred. This feedback mechanism enables automatic detection of sealing defects without requiring manual inspection or extensive reconfiguration when changing packaging bag types.
2Manufacturing precision
If the heater bars apply high sealing pressure to ensure proper sealing, then the sealing quality is improved, but the packaging bag may be burned
Solution Approach 1:
The sensor detects the actual position of the heater bars during the closing operation and provides feedback to the control unit. Based on this feedback, the control unit determines whether defective biting has occurred and adjusts the sealing pressure accordingly. This prevents excessive pressure that could cause burning while ensuring sufficient pressure for proper sealing.
Solution Approach 2:
The patent makes the sealing pressure dynamic rather than fixed. The control unit adjusts the sealing pressure based on the detected heater bar position and the determination of defective biting. This dynamic adjustment allows the system to apply appropriate pressure for each specific sealing condition, preventing both insufficient sealing and excessive pressure causing burning.
3Manufacturing precision
If the sealing device is configured for a specific packaging bag type, then the sealing pressure and time are optimized, but extensive reconfiguration is required when changing to a different bag type
Solution Approach 1:
The sensor provides real-time feedback on heater bar position during the closing operation. The control unit uses this feedback to detect defective biting and adjust sealing parameters automatically. This enables the system to adapt to different packaging bag types without extensive reconfiguration, as the feedback mechanism automatically compensates for variations in bag thickness and material properties.
4Ease of manufacture
If the servomotor detects defective biting through variations in rotation amount or torque, then defective biting can be detected without sensors, but the clearance between heater bars increases during closing operation causing potential burning of the packaging bag
Solution Approach 1:
The patent introduces a sensor as an intermediary element that directly measures the position of the heater bars during closing operation. This sensor provides accurate position information to the control unit without requiring increased clearance between the heater bars. The intermediary sensor enables precise detection of defective biting while maintaining proper heater bar clearance to prevent burning.
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
The device ensures optimal sealing pressure and time for each type of packaging bag, minimizing defects and simplifying the assembly and maintenance process by automatically adjusting to different bag types, thus improving efficiency and reducing the risk of errors.
Implementation Method 1
a pair of heater bars 11, 11' opposed to each other so as to be openable/closable. The heater bars 11, 11' hold the vicinity of the bag mouth of the packaging bag when closed, thereby heat-sealing the vicinity of the bag mouth of the packaging bag
Data Source
AI summary
A sealing device incorporated in a packaging machine heat-seals a vicinity of a bag mouth of a packaging bag. Paired heater bars are disposed opposite each other so as to be openable/closable and hold the vicinity between them when closed, thereby heat-sealing the vicinity. A link mechanism converts rotation of an output shaft of a servomotor to an opening/closing operation of the heater bars. A storage unit stores seal patterns, each of which includes a sealing pressure applied to the parts and a sealing time period for which the parts are continuously held. A selection unit is configured to select one seal pattern. The output shaft is rotated by a predetermined closing angle according to the sealing pressure of the selected seal pattern to close the heater bars. The heater bars are maintained in the closed state for the sealing time period of the selected seal pattern.