Sheet Processing Apparatus Blade Guide Member Dynamics
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Solution Overview
Problem
Existing sheet processing apparatuses face challenges in guiding sheet end portions properly during multiple folding processes, particularly when the diameter of the folding roller increases, leading to delayed timing and potential transport losses due to the need for a longer distance between the push plate and the turn-up preventing member.
Innovation Solution
A sheet processing apparatus with a transport path, a rotating body pair, a folding blade, a blade guide member, and an angle change section that shifts and rotates to guide the sheet end portion effectively into the nip portion, ensuring proper folding without turn-up issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the folding roller is increased, then the folding capacity is improved, but the distance between the push plate front edge and the turn-up preventing member must be longer, causing delayed timing and transport loss
Solution Approach 1:
The turn-up preventing member is designed to be movable rather than fixed, allowing it to dynamically adjust its position based on the folding roller diameter. During sheet feeding, the member moves to an initial position that prevents turn-up; during sheet discharge, it moves to a retracted position that avoids interference with the folding roller, enabling large diameter rollers to be used without increasing the push plate distance
Solution Approach 2:
The push plate assembly is divided into functionally independent components: the push plate for pushing sheets, and the separately movable turn-up preventing member for guiding sheet ends. This segmentation allows each component to be optimized independently - the turn-up preventing member can be positioned closer to the push plate front edge without compromising either sheet pushing or turn-up prevention functionality
2Loss of time
If the distance between the push plate front edge and the turn-up preventing member is shortened, then timing is improved and transport loss is reduced, but the turn-up preventing member may hit the outer region of the folding roller when the diameter is large
Solution Approach 1:
The turn-up preventing member is designed with movable capability along the sheet feeding direction, allowing it to dynamically adjust its position. During sheet feeding, it is positioned to effectively guide the sheet end and prevent turn-up. During sheet discharge, it is retracted to avoid interfering with the folding roller, enabling the use of large diameter folding rollers without increasing the distance to the push plate front edge
Data Source
AI summary
In order to enable a sheet end portion to be properly guided to a nip portion in performing folding processing a plurality of times, provided are a transport path including a guide face to guide a transported sheet, a rotating body pair which nips the sheet transported to the transport path by a nip portion to rotate, a folding blade that pushes the sheet to the nip portion of the rotating body pair, and a blade guide member including a guide portion for pushing one end of the sheet to the nip portion when the folding blade pushes the sheet to the nip portion, and a shift section that shifts the folding blade and the blade guide member in a push direction for pushing to the nip portion and in a return direction opposite to the push direction.