Convex and Concave Cam Synchronous Creasing for Packaging Paper
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Solution Overview
Problem
Existing single-sided creasing technologies in packaging box production cause stress concentration fractures and microcracks on the back side of paper due to asymmetric deformation, leading to surface peeling and structural integrity issues.
Innovation Solution
A paper cutting and creasing equipment utilizing a synchronous combination of convex and concave cams, where a convex cam at the lower part of the paper surface is combined with a concave cam at the upper part, enabling simultaneous and linear movement to perform double-sided creasing, thereby avoiding stress concentration fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-sided creasing is performed on the paper surface, then the creasing process is simple and efficient, but microcracks and surface peeling occur on the back side of the paper
Solution Approach 1:
The creasing process is segmented into two independent actions: upper cam creasing from the front side and lower cam creasing from the back side. Each cam independently performs creasing on one side of the paper, allowing simultaneous dual-sided processing that prevents paper fiber fracture while maintaining high efficiency
Solution Approach 2:
The lower cam assembly is nested within the paper pressing system structure, with the convex cam positioned to contact the back side of the paper through a through-hole in the pressing plate. This nested configuration allows the lower cam to perform creasing from the back side while being integrated into the overall pressing mechanism
2Stability of the object's composition
If a hard supporting platform is used during single-sided creasing, then the supporting structure is stable, but asymmetric deformation occurs with single-sided depression in the cross section
Solution Approach 1:
Instead of supporting the paper from below with a hard platform and pressing from above, the invention inverts the approach by introducing a lower cam that actively presses from the back side upward. This reverses the traditional support-press configuration, allowing symmetric bilateral pressing that creates symmetric V-shaped creases without single-sided depression
Solution Approach 2:
The lower cam acts as an intermediary element between the paper back side and the internal structure of the pressing system. It transmits the creasing force from the driving mechanism to the paper, enabling controlled bilateral pressing while maintaining structural stability
3Shape
If convex and concave cams are used for double-sided creasing, then symmetric deformation is achieved, but the device complexity increases
Solution Approach 1:
The upper and lower cam assemblies are merged into a single integrated pressing mechanism driven by one motor. The synchronous belts and transmission mechanisms are combined to coordinate both cams, reducing the need for separate drive systems while maintaining symmetric dual-sided creasing capability
Solution Approach 2:
The lower cam assembly serves multiple functions: it provides support from the back side, performs active creasing through the convex cam, and maintains paper positioning. This multi-functionality reduces the need for additional separate components, offsetting the complexity of adding dual-sided creasing capability
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 equipment ensures high automation and prevents microcracks and surface peeling by ensuring symmetric deformation on both sides of the paper, enhancing the structural integrity and appearance quality of packaging boxes.
Implementation Method 1
the convex cam assembly passes through the through hole and is in rolling contact with the paper from a lower part of the paper; the concave cam assembly and the convex cam assembly axially rotate, and are combined with the first creasing carriage, the second creasing carriage and the first synchronous belt to perform linear motion
Data Source
AI summary
Disclosed is a paper cutting and creasing equipment based on synchronous combination of convex and concave cams, including a rack and a paper pressing system, where a groove is formed in a center of the paper pressing system; and a first synchronous belt entering the groove, where the first synchronous belt is arranged below paper, the first synchronous belt is also provided with a through hole, a first linear advancing part is arranged above the paper pressing system, and a second linear advancing part is arranged below the paper pressing system. The first linear advancing part is equipped with a first creasing carriage, and the original single-sided creasing of packaging paper from above is changed to double-sided creasing of packaging paper through the cooperation of a convex cam and a concave cam, thereby preventing microcracks on the back side of the packaging paper and even surface peeling.