Roller Rack and Pinion Flying Punch for High-Speed Alignment
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Solution Overview
Problem
Flying punch and cutoff machines face challenges with existing mechanisms, such as belt driven systems offering high speed but low accuracy with large masses, standard rack and pinion systems requiring frequent adjustments and operating in an oil bath, and ball screw driven systems lacking high speed and being prone to catastrophic failure under overload.
Innovation Solution
A flying punch and cutoff machine employing a roller rack and pinion mechanism, controlled to match the line speed of a moving item, allowing for high-speed operation with accurate alignment and the ability to handle masses greater than 2500 lb without relative motion between the tool and item, and maintaining precision with low backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If belt driven systems are used, then high speed operation is achieved, but manufacturing precision deteriorates when operating with large masses
Solution Approach 1:
The patent replaces traditional belt driven mechanical systems with a roller rack and pinion mechanism. This substitution maintains the ability to achieve high line speeds while dramatically improving manufacturing precision through the inherent mechanical advantage of the rack and pinion geometry, which provides positive engagement and eliminates the slippage and backlash issues of belt systems.
Solution Approach 2:
The patent changes the fundamental mechanical parameters of the drive system by using a roller rack and pinion configuration instead of belts. This parameter change allows the system to simultaneously achieve high speed operation and high precision alignment, as the roller contact provides both speed capability and precise positional control through the gear engagement geometry.
2Manufacturing precision
If standard rack and pinion systems are used, then high accuracy and high speed are achieved, but device complexity increases due to frequent backlash adjustment and oil bath operation requirements
Solution Approach 1:
The roller rack and pinion system is designed to be self-adjusting through its roller contact mechanism. The rollers naturally maintain optimal engagement with the rack teeth through their rolling motion, eliminating the need for frequent manual backlash adjustments. The system essentially adjusts itself through the mechanical geometry of the roller-rack interaction.
Solution Approach 2:
The patent extracts the oil bath requirement from the system design by using a roller rack and pinion configuration that operates without continuous lubrication immersion. The roller contact points can be locally lubricated or designed with self-lubricating materials, eliminating the complexity of maintaining a full oil bath system while still achieving high accuracy and speed.
3Manufacturing precision
If ball screw driven systems are used, then high accuracy and long life are achieved, but speed capability deteriorates and reliability worsens under overload conditions
Solution Approach 1:
The patent replaces ball screw driven systems with a roller rack and pinion mechanism. This substitution resolves the speed limitation by using direct roller contact that can accommodate higher velocities without the friction and heat generation issues of ball screw threads. The system also improves reliability under overload conditions through the robust gear engagement geometry that can withstand shock loads better than ball screws.
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 roller rack and pinion mechanism enhances performance by enabling high-speed operation with precise alignment and robustness, eliminating the need for frequent adjustments and reducing the risk of catastrophic failure, while maintaining high accuracy and long machine life.
Implementation Method 1
roller rack and pinion mechanism...roller pinion operatively coupleable to the rack to impart motion to the carriage assembly
Data Source
AI summary
A flying punch and cutoff machine that performs an operation on a moving item that moves at a line speed includes a support assembly; a carriage assembly movably supported by the support assembly; a tooling assembly supported by the carriage assembly, the tooling assembly including a tool to perform an operation on the moving item; a roller rack and pinion mechanism supported by the support assembly and configured to impart motion to the carriage assembly; and a controller configured to control the roller rack and pinion mechanism so that a line speed of the carriage assembly and tool matches the line speed of the moving item so that the operation is performed on the moving item with that no relative motion occurring between the moving item and the tool.