Cam-Guided Creasing Device for Bookbinding
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Solution Overview
Problem
Existing creasing devices for bookbinding suffer from rapid wear of vertical linear actuators, requiring constant maintenance, and have complex constructions that affect accurate and repeatable crease formation, with issues in tool positioning and large size.
Innovation Solution
A creasing device with a pair of tools, a stationary and a movable tool, using a slider-crank mechanism and cam-guided displaceable members to ensure accurate and stable positioning without needing to turn the article upside down, featuring a simple structure and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vertical linear actuators are used to position the displaceable member, then the device can selectively form creases with changing positioning patterns, but the actuators are prone to rapid wear and require constant maintenance
Solution Approach 1:
The patent replaces the vertical linear actuators with a cam mechanism that uses rotational motion to achieve the same positioning function. The cam profile is designed to convert rotational movement into the required linear displacement of the displaceable member, eliminating the wear-prone actuator components while maintaining the ability to selectively position the member for different crease patterns.
Solution Approach 2:
The cam mechanism operates through periodic rotational cycles, where each rotation corresponds to one positioning cycle of the displaceable member. This periodic action allows the system to repeatedly form different crease patterns by simply rotating the cam to different angular positions, replacing the need for complex actuator control while improving reliability.
2Manufacturing precision
If vertical linear actuators are used for tool positioning, then crease formation can be controlled, but the actuators must be accurately calibrated and gaged to ensure constant repeatability
Solution Approach 1:
The cam mechanism is designed with self-aligning features where the cam profile itself defines the precise positioning path. The displaceable member is guided by the cam geometry, which automatically ensures accurate positioning without requiring external calibration or ga ging systems. The mechanism self-regulates its positioning accuracy through the inherent geometry of the cam profile.
3Adaptability or versatility
If multiple creasing units with one-piece assemblies are used, then creases can be formed, but changes to the crease-forming pattern require turning the article upside down, involving much longer overall processing times
Solution Approach 1:
The patent introduces dynamic positioning capability where the displaceable member can be moved to different positions during the same operational cycle. This allows the system to adaptively form different crease patterns on the same side of the article without requiring physical reorientation, dramatically reducing processing time while maintaining pattern flexibility.
4Adaptability or versatility
If the device comprises multiple creasing units with one-piece assemblies, then creases can be formed, but the construction becomes highly complex and the device size becomes very large
Solution Approach 1:
The patent segments the creasing tool into a stationary member and a displaceable member that can independently position. This segmentation allows the system to achieve multiple crease patterns using a single simplified tool assembly rather than requiring multiple complex one-piece assemblies. The displaceable member can be positioned at different locations to create various crease configurations, reducing overall device complexity and size.
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 device achieves consistent and accurate crease formation over many cycles with minimal maintenance, improving processing efficiency and reducing the impact of component clearances and tolerances.
Implementation Method 1
using a slider-crank mechanism and cam-guided displaceable members to ensure accurate and stable positioning
Implementation Method 2
using a slider-crank mechanism and cam-guided displaceable members to ensure accurate and stable positioning
Data Source
Figure 1~2
Figure 3~5
Figure 6A~6B
AI summary
A creasing device (1) for forming creases (C) comprising a frame (2) with a substantially horizontal support surface (3) for supporting an article to be creased (A) and a pair of tools, a movable tool (6) and a stationary tool (5), the latter comprising a stationary member (12) and at least one displaceable member (1 3) whose position can be adjusted in height relative to the stationary member (12). First actuator means (11) act upon the movable tool (6) to move it toward the stationary tool (5) and interact with the opposite faces (Fs, Fl) of the article (A), and second actuator means (14) act upon the displaceable member (13) to translate it between a first end position (P1) in which it is designed to interact with the movable tool (6) and a second end position (P2) in which it cannot interact with the movable tool (6) and guide means (19) associated with the stationary tool (5) to guide the displaceable member (13) between the first end position (P1) and the second end position (P2). The guide means (19) are of the type having a curvilinear path (T) contained in a plane (ττ) substantially perpendicular to the support surface (3). A creasing machine comprising the aforementioned creasing device (1).