Counter-mass for Component Placement Device
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Solution Overview
Problem
Existing component placement devices face challenges with dynamic crosstalk due to reactive forces from high accelerations, leading to vibrations and deformations in the machine frame, which affect accuracy and increase costs when trying to mitigate these effects.
Innovation Solution
Incorporating a movable counter-mass that counteracts reactive forces by moving in the opposite direction to the component pickup unit, using a second drive to ensure minimal torque and synchronization with the component pickup unit's movement, allowing for independent control and reduced frame deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high acceleration is used to move the component pickup unit for high speed placement, then productivity is improved, but reactive forces cause vibrations and deformations of the machine frame affecting accuracy
Solution Approach 1:
A counter-mass is introduced that moves in opposition to the component pickup unit. When the component pickup unit accelerates in one direction, the counter-mass accelerates in the opposite direction, generating counteracting inertial forces that balance the reactive forces on the machine frame. This allows high acceleration movements to proceed without causing vibrations or deformations that would compromise positioning accuracy.
2Manufacturing precision
If lower acceleration is used to reduce reactive forces, then frame vibrations are reduced, but productivity decreases due to fewer components moved per unit time
Solution Approach 1:
The counter-mass system enables the use of higher accelerations by actively compensating for reactive forces. The counter-mass is controlled to move in opposition to the component pickup unit, creating balancing forces that prevent frame vibrations. This resolves the trade-off by allowing high-speed movements without sacrificing positioning accuracy.
3Manufacturing precision
If the machine frame is made heavier and stiffer to absorb reactive forces, then positioning accuracy is maintained, but production costs increase
Solution Approach 1:
Instead of increasing the mass and stiffness of the machine frame to resist reactive forces, the invention introduces a counter-mass that actively balances these forces through controlled motion. This dynamic compensation approach achieves the same positioning accuracy benefits as a heavier, stiffer frame but with a much lighter and more cost-effective structure.
4Manufacturing precision
If an auxiliary freestanding frame is used to support the drive unit, then reactive forces are counteracted, but device complexity and costs increase
Solution Approach 1:
The counter-mass is integrated with the existing subframe structure rather than requiring a separate auxiliary freestanding frame. The drive unit for the counter-mass is mounted on the subframe, combining multiple functions into the existing structure. This reduces device complexity and eliminates the need for additional supporting infrastructure while still achieving reactive force compensation.
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 solution effectively minimizes the impact of reactive forces on the machine frame, improving accuracy and flexibility by allowing each component pickup unit to have its own counter-mass, reducing dynamic crosstalk and maintaining high placement precision while avoiding costly frame reinforcements.
Implementation Method 1
a movable counter-mass being movable relative to the subframe by a second drive in a direction opposite to the direction of movement of the component pickup unit to at least partially counteract a reactive force exerted on the subframe by the component pickup unit during movement of the component pickup unit in the direction of movement relative to the subframe
Data Source
AI summary
A component placement device is provided. The component placement device includes a machine frame, a subframe supported by the machine frame, and a component pickup unit. The component pickup unit is movable relative to the subframe. The component pickup unit is movable by a first drive at least in a direction of movement. The component placement device includes a movable counter-mass being movable relative to the subframe by a second drive in a direction opposite to the direction of movement of the component pickup unit to at least partially counteract a reactive force exerted on the subframe by the component pickup unit during movement of the component pickup unit in the direction of movement relative to the subframe.