Envelope Flap Folding Plate Layout for Wrinkle-Free Fold Lines
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Solution Overview
Problem
Existing paper folding mechanisms in envelope manufacturing devices suffer from instability in paper conveyance, leading to wrinkles and imprecise folding lines due to variations in paper type and size, affecting the quality of the finished product.
Innovation Solution
A paper folding device with a folding plate that turns along the conveyance direction, using guide plates and conveying rollers to stabilize paper positioning and prevent wrinkles, ensuring precise folding line placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional paper folding mechanism with a turning folding plate is used, then the flap can be folded back onto the envelope body, but wrinkles may form in the folding line portion and the position precision of the folding line degrades
Solution Approach 1:
The folding mechanism is segmented into multiple functional components: a pressing roller that applies pressure to the folding line, guide plates that constrain paper movement, and a folding plate that performs the actual folding. This segmentation allows each component to address specific aspects of the folding process, preventing wrinkles while maintaining position precision.
Solution Approach 2:
Guide plates are introduced as intermediary elements between the folding plate and the paper. These guide plates prevent lateral displacement of the paper during folding, acting as mediators that maintain the prescribed position of the folding line while allowing the folding plate to perform its folding function.
2Ease of operation
If the folding plate turns to fold the flap portion, then the flap can be pasted to the main body, but the paper may be displaced in the processing part
Solution Approach 1:
Guide plates serve as intermediary elements that constrain the paper's lateral movement during the folding process. By positioning these guide plates appropriately, the system ensures that the paper remains at the prescribed position even when the folding plate turns, thereby maintaining folding line position accuracy.
Solution Approach 2:
The pressing roller applies pressure to create a crease along the folding line before the folding plate completes the folding action. This preliminary action of creating a crease guides the paper into the correct position and prevents displacement during the subsequent folding movement.
3Device complexity
If a simple folding mechanism is used, then the device complexity is reduced, but the conveyance state of the paper is not stabilized
Solution Approach 1:
The folding mechanism merges multiple functions into a compact structure: the pressing roller combines conveying and pressing functions, while the guide plates simultaneously guide and stabilize the paper. This merging allows the mechanism to maintain paper conveyance stability without proportionally increasing device complexity.
Solution Approach 2:
The pressing roller serves multiple functions: it conveys the paper forward, applies pressure to create the folding crease, and stabilizes the paper position. This multi-functionality reduces the need for separate components, maintaining simplicity while ensuring conveyance stability.
Data Source
AI summary
An object of the present disclosure is to prevent wrinkles in a folding line portion of a paper irrespective of the conditions such as the type, the size, and the like of the paper, thereby securing the precision of the position of a folding line when a flap (such as a flap portion) of an envelope is folded back. The folding unit comprises a pair of an upper and a lower guide plates that defines part of the paper conveyance path at the folding position, and the folding plate is configured so that, when turning from the placement position to the overlap position, a lower face of the folding plate overlaps an upper face of the upper guide plate of the pair of the upper and the lower guide plates.