Dynamic Creasing Pressure Control for Spine and Hinge Folds
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Solution Overview
Problem
Existing printing systems cannot adjust creasing pressure for a single medium based on different creasing purposes, such as 'crease for a spine edge' and 'crease for a hinge', leading to suboptimal fold quality.
Innovation Solution
A printing system with a control unit that adjusts creasing pressure dynamically between 'crease for a spine edge' and 'crease for a hinge' by using distinct pressure settings for each creasing purpose, allowing for precise control of creasing pressures based on the specific requirements of the creasing purpose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the same pressure is applied for all creasing operations on a single medium, then the creasing process is simple, but the fold quality deteriorates due to inappropriate pressure for specific creasing purposes
Solution Approach 1:
The creasing pressure is made dynamic and adjustable based on the creasing purpose. The control unit changes the pressure between a first pressure (70-120 Kgf) for spine edge creases and a second pressure (about 140 Kgf) for hinge creases, allowing the system to adapt to different requirements without manual intervention.
Solution Approach 2:
The patent changes the pressure parameter according to the creasing purpose. By identifying whether a crease is for a spine edge or hinge, the system automatically selects the appropriate pressure level, thereby improving fold quality while maintaining operational simplicity.
2Reliability
If high pressure is applied to make a crease for a hinge, then the crease is effective for opening the cover, but creasing traces remain remarkable on spine edge folds
Solution Approach 1:
Different pressure levels are applied to different locations on the medium based on the creasing purpose. Spine edge creases receive lower pressure (70-120 Kgf) to maintain quality, while hinge creases receive higher pressure (about 140 Kgf) to ensure effectiveness, with the control unit automatically selecting the appropriate pressure based on the crease location and purpose.
3Manufacturing precision
If low pressure is applied for spine edge creases, then fold quality is improved, but hinge creases become less effective for opening the cover
Solution Approach 1:
The system dynamically adjusts pressure based on the identified creasing purpose. When a spine edge crease is detected, lower pressure (70-120 Kgf) is applied to preserve quality. When a hinge crease is detected, higher pressure (about 140 Kgf) is applied to ensure the crease is effective for opening the cover.
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
Enables high-quality creasing by ensuring appropriate pressure is applied for each creasing purpose, preventing creasing traces and improving the overall fold quality of printed materials.
Implementation Method 1
a first pressure at a portion, corresponding to an edge of a spine cover, of the sheet... and perform creasing at a second pressure different from the first pressure at a portion of the sheet that corresponds to a hinge
Data Source
AI summary
A printing system comprises: a printing unit configured to print an image on a sheet; and a control unit configured to control to perform creasing at a first pressure at a portion, corresponding to an edge of a spine cover, of the sheet on which the printing unit has printed the image, and perform creasing at a second pressure different from the first pressure at a portion of the sheet that corresponds to a hinge.