Variable Load Reduction Ratio in Sheet Processing Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet processing apparatuses, such as staplers, have a constant load reduction ratio, which can lead to increased operation member movement and apparatus size, making them less user-friendly, especially for individuals with smaller hands, and requiring users to stand instead of sit, thereby reducing operational convenience.
Innovation Solution
The sheet processing apparatus is designed to change the load reduction ratio based on the necessary load for the operation, allowing for a smaller reduction ratio in low-load areas and a larger ratio in high-load areas, thereby reducing the operation member movement and maintaining a desired load reduction without increasing the operation amount, thus preventing apparatus enlargement and improving operational feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant load reduction ratio is used in conventional sheet processing apparatus, then the load reduction rate is maintained throughout the entire stroke, but the operation member movement distance increases and the apparatus size enlarges
Solution Approach 1:
The patent applies the dynamics principle by making the load reduction ratio variable rather than constant. The mechanism dynamically adjusts the reduction ratio based on the stroke position, using a curved guide surface that changes the mechanical advantage throughout the operation cycle. This allows the system to optimize performance at different stages of the stroke.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the mechanism during operation. The guide surface curvature and the relative positions of fulcrums are designed to change the leverage ratio as the operation progresses, transforming the constant parameter approach into a variable parameter system that adapts to operational needs.
2Reliability
If a constant load reduction ratio is used, then the load is reduced uniformly, but the apparatus height increases making it difficult for users with small hands to operate
Solution Approach 1:
The mechanism dynamically adjusts the operational characteristics by varying the reduction ratio, allowing the apparatus to maintain compact dimensions while providing adequate load reduction when needed. The dynamic adjustment enables the same mechanism to serve different operational requirements without requiring increased size.
Solution Approach 2:
By changing the geometric parameters of the mechanism during operation, the system achieves variable performance characteristics within a compact form factor. The parameter variation allows optimization of both size and functionality without compromise.
3Ease of operation
If the apparatus size is increased to reduce operation member movement, then the load reduction can be optimized, but the apparatus becomes less ergonomic for sitting posture operation
Solution Approach 1:
The dynamic adjustment of the reduction ratio allows the mechanism to achieve optimal performance with reduced movement distance while maintaining a compact height suitable for sitting posture operation. The variability in the mechanism's characteristics enables adaptation to ergonomic requirements.
4Device complexity
If a constant reduction ratio is used, then the mechanism is simple, but it cannot adapt to varying load requirements throughout the stroke
Solution Approach 1:
The patent changes the geometric parameters of the mechanism during operation to adapt to varying load requirements. The guide surface design and fulcrum positioning create natural parameter variations that provide adaptability without requiring complex control systems or multiple components.
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 design allows for a more ergonomic and convenient user experience by allowing users to comfortably operate the apparatus with reduced strain, enabling operation with smaller hands and at a sitting posture, while maintaining efficient load reduction.
Implementation Method 1
a spring (53) which is disposed between the follower (52) and the lower handle unit (11a) and which pushes the follower (52) upward
Implementation Method 2
a follower (52) which is pressed by the spring (53) and follows an outer periphery shape of the cam (51)
Data Source
AI summary
A sheet processing apparatus is provided with an operation member and an motion member that rotates with a force of the operation member through the connection part and applies force to an acting member. A fulcrum of a rotating operation of the operation member moves depending on an operation of the operation member. A first length between the fulcrum and a part at which the operation member is applied with the force and a second length between the fulcrum and a part at which the force is applied from the operation member to the motion member are changed.