Nested Arm Structure for Compact Sheet Binding
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Solution Overview
Problem
Existing sheet processing devices face challenges in downsizing while maintaining load-bearing capacity for stapleless binding, as increasing metal plate thickness to reduce size complicates arm formation and increases manufacturing costs due to the need for secondary processes.
Innovation Solution
A sheet processing device with a double-structured upper arm comprising a first and second arm member, where the second arm member covers part of the first arm member, allowing for swinging between binding and standby positions, effectively distributing load and reducing external size without deforming through-holes during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the metal plate is increased to reduce the size of the arm and increase load-bearing capacity, then the load-bearing capacity is improved, but the ease of manufacture deteriorates due to the need for secondary processes to form through-holes
Solution Approach 1:
The upper arm is divided into a first arm member and a second arm member that are separately formed and then assembled together. This segmentation allows each member to be manufactured with optimal thickness for through-hole formation, avoiding the need for secondary processes that would be required if a single thick plate were used.
Solution Approach 2:
The second arm member is disposed to overlap and cover a part of the first arm member, creating a nested configuration. This nesting allows the arm to achieve increased load-bearing capacity equivalent to a thicker plate while maintaining the manufacturability of thinner individual components with properly formed through-holes.
2Volume of moving object
If the size of the arm is reduced to downsize the apparatus, then the volume is improved, but the load-bearing capacity deteriorates
Solution Approach 1:
The nested configuration of the first and second arm members allows the arm to maintain a compact external size while achieving the load-bearing capacity of a thicker structure. The overlapping members work together to distribute and withstand the binding load.
Solution Approach 2:
The arm is constructed as a composite structure using two separate arm members instead of a single monolithic component. This composite approach enables the arm to achieve high strength-to-volume ratio by combining multiple thinner members that collectively provide the required load-bearing capacity.
Data Source
AI summary
According to an aspect of the present invention, there is provided a sheet processing device including a first teeth portion, a second teeth portion that clamps and binds a sheet bundle with the first teeth portion, a first support portion supporting the first teeth portion, a shaft, and a second support portion supporting the second teeth portion. The second support portion includes first and second arm members integrally supported to be capable of swinging around the shaft between a binding position in which the second teeth portion clamps and binds the sheet bundle with the first teeth portion and a standby position in which the second teeth portion is apart from the first teeth portion. The second arm member is provided over the first arm member so as to cover a part of the first arm member.