Bag Sealing Electromagnetic Lock for Banknote Filling
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Solution Overview
Problem
Existing devices for filling and closing disposable bags with banknotes face issues with sealing due to the movement of banknotes caused by sealing bars, especially when bags have high friction coefficients, leading to incomplete sealing or banknotes being pushed out of the bag.
Innovation Solution
Incorporating an electromagnetic stop element consisting of an electromagnet and a ferromagnetic material to lock the movable support plane, preventing the upward thrust from springs and keeping banknotes spaced from sealing bars during the sealing process, thus allowing for precise control and reliable bag closure without complex mechanical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compression or traction springs are used to push the lower movable plane, then the device can automatically lower the support plane as banknotes are added, but the springs cause the support plane to lift during sealing, leading to banknote displacement and sealing failures
Solution Approach 1:
The patent applies preliminary anti-action by introducing an electromagnetic braking system that counteracts the spring force before the sealing operation begins. The brake is activated in advance to lock the support plane, preventing the harmful upward movement that would otherwise occur during sealing. This eliminates the conflict between the spring-driven automatic filling and the sealing reliability by pre-neutralizing the spring's detrimental effect.
Solution Approach 2:
The electromagnetic brake acts as an intermediary element between the spring system and the support plane. It mediates the conflict by selectively engaging to control the support plane's movement - allowing spring-driven lowering during filling while preventing spring-driven lifting during sealing. This intermediary component enables both automatic filling and reliable sealing without direct mechanical conflict.
2Measurement precision
If electromagnetic motors, clutches, or solenoids are used to control the support plane position, then precise positioning can be achieved, but the device complexity and space requirements increase significantly
Solution Approach 1:
The patent extracts only the essential braking function needed for positioning control, eliminating the need for complex electromagnetic motors, clutches, or solenoids. By using a simple electromagnetic brake that merely needs to counteract spring force rather than provide full positioning control, the device achieves sufficient precision with minimal complexity. This extraction of the core function reduces mechanical and electronic complexity while maintaining adequate positioning accuracy for sealing operations.
3Ease of operation
If the lower support plane is allowed to move freely during sealing, then the bag can be properly positioned, but the banknotes move with the bag due to friction, preventing correct sealing
Solution Approach 1:
The patent applies preliminary action by locking the support plane in position before the sealing operation begins. The electromagnetic brake is activated in advance to prevent any movement of the support plane during sealing, ensuring that both the bag and banknotes remain stationary. This preliminary locking action eliminates the problem of banknote displacement while still allowing proper bag positioning to occur during the filling phase when movement is desired.
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
Enables simple, cost-effective, and reliable bag closure by maintaining the support plane in a fixed position, preventing banknotes from being pulled into the sealing bars and ensuring a proper seal, even with bags of high friction coefficients, through automated control of the electromagnetic stop.
Implementation Method 1
an electromagnetic stop element that can be controlled to lock the movable support with respect to the sealing bars, said electromagnetic stop element consisting of an electromagnet applied to the movable support and a fixed element made of ferromagnetic material
Implementation Method 2
a fixed element made of ferromagnetic material, adapted to face the electromagnet in operative condition
Data Source
AI summary
A device for filling and closing disposable bags for containing banknotes comprises an upper container for temporarily housing banknotes, provided with a bottom with an opening for the exit of the banknotes from the container, a piston for pushing the banknotes towards the opening on the bottom of the container, a bag made of flexible plastic film, intended to be filled with the banknotes temporarily housed in the container, a support for the bag containing the banknotes, vertically movable through controlled lowering means and placed below the container, sealing bars arranged between the upper container and the movable support, and an electromagnetic stop element that can be controlled to lock the movable support with respect to the sealing bars, said electromagnetic stop element consisting of an electromagnet applied to the movable support and of a fixed element made of ferromagnetic material, adapted to face the electromagnet in operative condition.