Sheet Binding Mechanism with Dynamic Force Control
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Solution Overview
Problem
Conventional sheet binding methods require high driving forces to bind sheets together, which is energy-intensive and inefficient, especially when using devices like staplers that rely on mechanical levers and motors to apply pressure.
Innovation Solution
A sheet processing apparatus with a pair of squeezing members having projections and recesses, where a pressure applying unit increases the pressing force as the relative distance between the members decreases, allowing for efficient binding with reduced energy consumption by using a combination of link and crank mechanisms to apply pressure in multiple steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional pressure applying methods (one-rotation cam or motor-driven rotary member) are used to bind sheets, then the binding function is achieved, but the driving force required is excessively large and energy consumption is high
Solution Approach 1:
The pressure applying member is designed to dynamically adjust the pressing force based on the thickness of the sheet bundle. As the squeezing members move closer together, the pressing force automatically increases, providing the necessary binding pressure only when needed while reducing force during insertion and alignment phases, thereby lowering overall energy consumption
Solution Approach 2:
The system changes the pressing force parameter continuously during the binding process. The pressing force starts at a lower level when the sheet bundle is inserted and gradually increases as the relative distance between squeezing members decreases, achieving optimal binding pressure dynamically rather than applying maximum force throughout the entire process
2Strength
If high pressing force is applied to bind sheets together, then the binding strength is sufficient, but the sheets may be damaged and energy consumption increases
Solution Approach 1:
The pressing force is applied dynamically, starting gradually and increasing only as needed based on the sheet bundle thickness. This dynamic application prevents sudden high-force impacts that could damage sheets while ensuring sufficient binding strength is achieved through controlled, progressive compression
Solution Approach 2:
The system prepares for the binding process by initially applying gentle pressure to position the sheet bundle correctly between the squeezing members before increasing the pressing force. This preliminary cushioning phase prevents sheet damage by avoiding abrupt application of high force
3Manufacturing precision
If the pressing force is increased as the thickness of the sheet bundle increases, then the binding quality improves, but the driving force required increases
Solution Approach 1:
The pressing force parameter is changed in direct response to the sheet bundle thickness. The pressure applying member is designed to automatically generate higher pressing forces only when thicker bundles are detected, maintaining optimal binding quality across different bundle sizes without requiring the system to always prepare for maximum force scenarios
4Reliability
If a motor-driven system with rotary member is used to apply pressure, then the binding function is reliable, but the device complexity and energy consumption increase
Solution Approach 1:
The pressure applying member is designed to self-adjust the pressing force based on the sheet bundle thickness without requiring complex external control systems. The mechanism automatically generates the appropriate force as the squeezing members move closer, eliminating the need for motors, sensors, and control circuits while maintaining reliable binding performance
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 apparatus effectively binds sheets with a reduced driving force, conserving energy and improving the binding quality by gradually increasing the pressing force during the binding process, minimizing damage to the sheets and enhancing the binding capability.
Implementation Method 1
a pressure applying unit to apply pressing force to the pair of squeezing members... The pressing force generated between the squeezing members by the pressure applying unit increases in strength as a relative distance between the squeezing members decreases
Implementation Method 2
A sheet bundle is inserted therebetween, squeezed in a direction of thickness of the sheet bundle, and thus bound... the pressure is increased as the thickness of the sheet bundle increases
Data Source
AI summary
A sheet processing apparatus includes a pair of squeezing members having a projection and a recess to engage each other, to squeeze a sheet bundle inserted therebetween in a direction of thickness of the sheet bundle, and a pressure applying unit to apply pressing force to the squeezing members to squeeze and bind the sheet bundle. The pressing force generated between the squeezing members by the pressure applying unit increases in strength as a relative distance between the squeezing members decreases.