Compound Toggle Platen Drive for Uniform Vertical Motion
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Solution Overview
Problem
Existing toggle mechanisms in press machines face challenges in uniformly applying large forces to platens due to the offset positioning of the drive shaft, leading to asymmetrical motion and difficulty in designing reliable and uniform vertical motion of the platen connectors.
Innovation Solution
A compound toggle system with symmetrical components positioned on both sides of the center line, including crank bars, pull bars, linear toggles, coupling toggles, and bar toggles, which operate uniformly despite the offset drive shaft, using different toggle sizes and lengths to compensate for the offset, ensuring balanced force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drive shaft is positioned offset from the center line, then the press machine can accommodate components in the center location, but the toggle mechanism experiences asymmetrical motion and difficulty in achieving uniform vertical motion of platen connectors
Solution Approach 1:
The patent employs asymmetrical toggle mechanism design where the toggle arms and connecting links are positioned at different lengths and angles relative to the offset drive shaft. This asymmetrical configuration compensates for the drive shaft's offset positioning, allowing the platen connectors to achieve uniform vertical motion despite the non-centred drive arrangement. The asymmetry in toggle geometry transforms the asymmetrical drive input into symmetrical platen output motion.
Solution Approach 2:
The patent introduces additional degrees of freedom through multi-linkage toggle mechanisms that operate in both horizontal and vertical dimensions. The toggle arms rotate about different fixed points in three-dimensional space, converting the single-axis rotational motion of the offset drive shaft into coordinated two-dimensional motion of multiple platen connectors, thereby achieving uniform vertical motion across all connectors despite the offset positioning.
2Force
If a compound toggle mechanism with multiple stages is used, then large force can be applied to the platen, but the device complexity increases with multiple crank bars, pull bars, and toggles
Solution Approach 1:
The compound toggle mechanism is divided into multiple independent but interconnected stages, each consisting of crank bars, pull bars, and toggles. Each stage processes and transmits force through its own set of components, with the output of one stage serving as the input to the next. This segmentation allows the complex force multiplication to be broken down into manageable modular units, each performing a specific function in the overall force transmission chain.
Solution Approach 2:
The patent combines multiple toggle sub-mechanisms into a single integrated compound toggle mechanism where the components share common fixed points, connecting links, and support structures. The crank bars, pull bars, and toggles are merged into a cohesive assembly that works together to multiply force, with the combined effect of all stages producing the large platen force required for the press machine operation.
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 system provides uniform vertical motion of the platen connectors, overcoming the challenges of asymmetrical positioning and ensuring balanced force application, enhancing the reliability and efficiency of the press machine operation.
Implementation Method 1
A toggle mechanism includes an assembly of a plurality of components linked together to provide a mechanical advantage, that is, a first force applied to one of the components resulting in a second, larger force being delivered by another of the components
Implementation Method 2
A compound toggle mechanism includes two or more stages of toggle mechanisms connected to one another to multiply the mechanical advantage provided by a single stage
Data Source
AI summary
A compound toggle system for applying a force to an external object comprises a drive motor, a drive shaft, a frame, and a compound toggle mechanism. The drive motor rotates the drive shaft to a first rotational angle and to a second rotational angle. The frame includes four side walls connected to one another to form a quadrilateral shape and a base connected to the side walls. compound toggle mechanism positioned in the frame. The compound toggle mechanism includes first and second compound toggle submechanisms, with each compound toggle submechanism including an object connector connecting to the external object and providing maximum extension to the external object when the drive shaft is at the first rotational angle and providing minimum extension to the external object when the drive shaft is at the second rotational angle.