Ultrasonic Envelope Moistening with Liquid Sensor Feedback
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Solution Overview
Problem
Existing envelope moistening apparatuses in mail preparation machines often spill liquid during nozzle testing and fail to ensure adequate moistening of envelope flaps for successful sealing, with operators tempted to start the machine too soon after filling the water reservoir, leading to improperly sealed envelopes.
Innovation Solution
An apparatus equipped with a liquid sensor that generates a humidity signal indicating the presence of a sufficient amount of liquid in the dispenser, allowing for automatic checking and ensuring reliable sealing without spilling liquid, by using a liquid sensor that measures the resistance or capacitance of the moistening cushion or brush, and controlling the liquid supply accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nozzle is used to spray liquid onto the envelope flap, then the envelope can be sealed, but liquid is spilled during nozzle testing
Solution Approach 1:
The patent replaces the mechanical spray nozzle system with an ultrasonic vibration-based liquid transfer system. The ultrasonic vibration module vibrates the liquid dispenser at a specific frequency to transfer liquid to the envelope flap without requiring high-pressure spraying, thereby eliminating liquid spillage during operation while maintaining effective sealing.
Solution Approach 2:
The patent utilizes the phase transition properties of liquid through ultrasonic vibration. The ultrasonic vibration causes intense molecular agitation that facilitates liquid transfer from the dispenser to the envelope flap through a controlled phase transition mechanism, enabling precise liquid application without spillage.
2Measurement precision
If a sensor is positioned to detect liquid emitted from the nozzle, then nozzle function can be monitored, but it cannot detect whether adequate liquid is sprayed to the flap
Solution Approach 1:
The patent implements a feedback control system where the sensor detects liquid at the source and this information is fed back to the controller, which adjusts the ultrasonic vibration parameters to ensure adequate liquid transfer to the envelope flap. This closed-loop feedback mechanism ensures both spill prevention and sufficient moistening.
Solution Approach 2:
The patent replaces the traditional spray nozzle detection system with an ultrasonic vibration-based liquid transfer system monitored by sensors. This substitution enables precise control of liquid transfer while maintaining detection capabilities, allowing the system to monitor both liquid emission and transfer effectiveness.
3Productivity
If the apparatus is started immediately after the water reservoir is filled, then time is saved, but envelopes are not properly sealed
Solution Approach 1:
The patent uses sensor feedback to monitor liquid levels in the reservoir and automatically controls the ultrasonic vibration activation. The system detects when sufficient liquid is available and automatically activates the ultrasonic vibration module, eliminating the need for manual waiting time while ensuring proper sealing conditions are met before operation begins.
Solution Approach 2:
The patent performs preliminary liquid transfer testing using the ultrasonic vibration module before actual envelope processing begins. The system pre-activates the liquid dispensing mechanism to ensure proper liquid transfer capability is established, guaranteeing that envelopes will be properly sealed from the first piece processed after reservoir filling.
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 automatic verification of the dispenser's readiness for moistening, preventing liquid spills and ensuring reliable envelope sealing, without requiring special dispenser movements or operator patience, by continuously monitoring the humidity level and adjusting the liquid supply.
Implementation Method 1
a liquid sensor that measures the resistance or capacitance of the moistening cushion or brush
Implementation Method 2
a liquid sensor that measures the resistance or capacitance of the moistening cushion or brush
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An apparatus for moistening flaps of envelopes has a liquid dispenser (21; 528; 628, 646; 721; 821) for dispensing liquid to the envelope flap of each envelope to be moistened (6). A liquid sensor (14, 18, 19; 514, 518, 519; 614, 618, 619; 714; 814, 818, 819) is provided for sensing liquid carried by the dispenser (21; 528; 628, 646; 721; 821) and generating a humidity signal indicating an amount of the liquid held by the dispenser (21; 528; 628, 646; 721; 821). A method for moistening flaps of envelopes is also described.