Planetary Roller Threaded Drive for Pad Printing Precision
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Solution Overview
Problem
Pad printing machines lack precise control over the movement and positioning of their components, leading to inaccuracies in printing quality and maintenance issues with pneumatic or hydraulic actuators.
Innovation Solution
The integration of an inverted planetary roller threaded drive in electric linear-actuators provides accurate control over the displacement of sub-assemblies in pad printing machines, allowing for programmable and precise control of forces and positions, replacing pneumatic or hydraulic actuators with improved reliability and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pneumatic or hydraulic actuators are used to drive sub-assemblies in pad printing machines, then large forces can be exerted, but control precision over speeds and positions deteriorates and maintenance issues arise
Solution Approach 1:
The patent replaces pneumatic or hydraulic actuators with an electrically controlled linear actuator featuring a planetary roller threaded drive. This substitution maintains the ability to exert large forces while achieving precise control over speeds and positions through electrical regulation, eliminating the control precision deterioration and maintenance issues associated with pneumatic/hydraulic systems
Solution Approach 2:
The invention changes the control parameter from pneumatic/hydraulic pressure control to electrical parameter control (voltage, current, frequency). This allows for accurate time-dependent and path-dependent force control, as well as precise positioning, by varying electrical parameters through a control system that can be hard-programmed or optionally programmable
2Force
If pneumatic or hydraulic actuators are used to attain high forces, then large forces can be generated, but reliability deteriorates due to maintenance needs and possible leakages
Solution Approach 1:
The patent substitutes pneumatic or hydraulic actuators with an electrically controlled linear actuator using a planetary roller threaded drive. This eliminates the reliability issues of pneumatic/hydraulic systems (maintenance needs, leakages) while maintaining the capability to generate large forces through the robust mechanical threaded drive mechanism
Solution Approach 2:
The planetary roller threaded drive system is designed to be self-contained and self-lubricating, reducing maintenance requirements. The system includes built-in features for maintaining operational reliability without external intervention, making it suitable for clean room environments where maintenance access may be limited
3Ease of operation
If conventional actuators are used in pad printing machines, then basic positioning is achieved, but manufacturing precision of printed output deteriorates
Solution Approach 1:
The control system for the planetary roller threaded drive can be equipped with feedback mechanisms (encoders, sensors) that monitor the actual position and movement of sub-assemblies. This feedback is fed back to the control system, which adjusts the electrical parameters to achieve precise positioning and speeds, thereby improving printing quality through closed-loop control
Solution Approach 2:
The system transitions from static or simple positioning to dynamic, programmable control of movement profiles. The control system can define accurate time-dependent and path-dependent movements, adjusting speeds and positions dynamically during operation to optimize printing quality for different stages of the printing cycle
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 enhances printing quality by enabling precise control over the movement and positioning of components, reducing maintenance needs and ensuring reliable operation, even in clean room environments.
Implementation Method 1
an electric, adjusting linear-actuator which is mechanically connected to the minimum of one displaceable first sub-assembly to drive it, characterized in that the electric, adjusting linear-actuator is fitted with an inverted planetary roller threaded drive
Data Source
AI summary
A pad printing machine comprising at least one inverted planetary roller threaded drive (12; 24; 36; 48; 60; 62) and application of latter to a pad printing machine.