Bookbinding Adhesive Coating Level Control
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Solution Overview
Problem
Existing bookbinding apparatuses face challenges in maintaining uniform adhesive coating due to fluctuations in adhesive liquid levels, especially in small-sized coating apparatuses, where the adhesive quantity sensor struggles to accurately detect level changes, leading to uneven coating and increased costs with multiple sensors.
Innovation Solution
A bookbinding apparatus with an adhesive reservoir, coating roller, pellet storage section, replenishing section, and controller that adjusts the pellet replenishment rate based on adhesive quantity sensor detections, ensuring consistent adhesive levels and uniform coating by monitoring the liquid level and adapting to varying sheet thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coating apparatus is made small in size, then the apparatus volume is reduced, but the adhesive liquid level fluctuates significantly causing non-uniform coating
Solution Approach 1:
The patent employs a liquid level sensor to detect the adhesive liquid level in the reservoir and uses this feedback signal to automatically control the pellet replenishment mechanism. When the liquid level drops below a threshold, the system automatically replenishes adhesive pellets, maintaining a stable liquid level despite the small reservoir volume, thereby ensuring uniform coating quality.
Solution Approach 2:
The coating apparatus is equipped with an automatic replenishment system that monitors its own adhesive levels and replenishes them without external intervention. The system self-regulates the adhesive supply by detecting liquid level changes and automatically adding pellets, enabling the small apparatus to maintain operational stability and coating uniformity autonomously.
2Device complexity
If a single adhesive quantity sensor is used, then the device complexity is reduced, but the liquid level detection precision is insufficient
Solution Approach 1:
The patent changes the detection parameter from direct liquid level measurement to temperature detection. The liquid level sensor detects the temperature difference between the sensor surface and the adhesive liquid - when the sensor contacts the liquid, the temperature rises to match the adhesive temperature, providing a clear detection signal. This parameter change enables accurate liquid level detection with a single sensor.
Solution Approach 2:
The patent replaces direct mechanical liquid level measurement with a temperature-based detection system. Instead of using multiple mechanical sensors or complex level measurement devices, the system uses a temperature-sensitive sensor that detects liquid presence through thermal conduction, simplifying the device while maintaining detection accuracy.
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
This configuration maintains a stable adhesive liquid level, enabling uniform coating and high-quality booklet production even in small-sized apparatuses, ensuring consistent adhesion strength and reducing the need for multiple sensors.
Implementation Method 1
The liquid level LS of the molten adhesive is detected using an adhesive quantity sensor TS that detects the temperature
Implementation Method 2
although the liquid level LS of the adhesive becomes high on the downstream side of the direction of rotation of the coating roller RL due to the viscosity of the liquid
Data Source
AI summary
A bookbinding apparatus for forming a booklet by coating an adhesive on a spine of a stack of sheets, including: a coating apparatus, which has an adhesive reservoir to store a liquid of the adhesive, and a coating roller to coat on the spine the adhesive scooped up from the adhesive reservoir; a pellet storage section to store pellets of the adhesive; a replenishing section to replenish the pellets of the adhesive into the adhesive reservoir; an adhesive quantity sensor to detect a liquid level in the adhesive reservoir; and a controller to control the replenishing section based on a detection signal of the adhesive quantity sensor, wherein the controller controls a rate of replenishing amount of the pellets by controlling the replenishing section based on information of the stack of sheets.