Platen Press Toggle Lever Convex Contact Surfaces
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Solution Overview
Problem
Existing press toggle mechanisms in platen presses face challenges with wear and seizure due to sliding contact surfaces, which are difficult to manage under high loading and frequency, despite efforts to minimize these issues through lubrication and surface scraping.
Innovation Solution
The design incorporates convex-shaped contact surfaces between toggle levers, transitioning the sliding motion to a rolling or combined rolling/sliding motion, reducing friction and eliminating the need for surface scraping, and includes a repeatability device to ensure kinematic repeatability and prevent slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sliding contact surfaces are used in the toggle mechanism, then the structure is simple and easy to manufacture, but the risk of wear and seizure increases under high loading and frequency
Solution Approach 1:
The patent applies curvature by providing convex-shaped contact surfaces on the toggle levers instead of flat sliding surfaces. This convex geometry enables rolling contact between the toggle levers, transforming the motion from sliding to rolling, which significantly reduces friction and wear while maintaining manufacturing simplicity
Solution Approach 2:
The patent substitutes the traditional sliding friction mechanism with a rolling motion mechanism. By introducing convex contact surfaces that roll against each other during toggle operation, the system replaces the high-friction sliding contact with low-friction rolling contact, eliminating the need for complex lubrication systems
2Reliability
If lubrication and surface scraping are used to reduce friction, then the risk of wear decreases, but the device complexity and manufacturing effort increase
Solution Approach 1:
The patent extracts and eliminates the need for lubrication systems and surface scraping operations by fundamentally changing the contact mechanism from sliding to rolling. The convex-shaped contact surfaces inherently provide low-friction rolling contact, removing the requirement for additional lubrication components and processes
Solution Approach 2:
The convex contact surfaces are designed to automatically provide rolling motion during toggle operation, self-regulating the friction characteristics without requiring external lubrication systems. The geometry itself serves the dual function of reducing friction and eliminating the need for maintenance operations
3Reliability
If convex-shaped contact surfaces are used, then friction and wear are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing convex-shaped contact surfaces only at the specific interaction points between toggle levers, rather than requiring high precision throughout the entire component. The convex geometry is localized to the contact areas where rolling motion occurs, reducing overall manufacturing complexity while achieving the desired friction reduction
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
This design significantly reduces the risk of wear and seizure, increases efficiency, and saves costs by minimizing lubrication needs and ensuring long-lasting functionality of the press toggle column.
Implementation Method 1
Because of the convex-shaped contact surfaces of the toggle levers the sliding motion between the contact surfaces is replaced by a (pure) rolling motion or a combined rolling/sliding motion, reducing the friction between the contact surfaces
Implementation Method 2
reducing the friction between the contact surfaces and thus the risk of wear or rather seizure
Data Source
Figure 1
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Figure 4~5
AI summary
A platen press with a press toggle mechanism (43) having a driving member (14) and a press toggle column (44). The press toggle column (44) comprises a driven member (38), a first toggle lever (46) assigned to the driven member (38) and a second toggle lever (48) assigned to the driven member (38). The first toggle lever (46) has a first contact surface (50) and the second toggle lever (48) has a second contact surface (52). Both toggle levers (46, 48) contact each other via their contact surfaces (50, 52), and wherein both contact surfaces (50, 52) are convex-shaped.