Shuttle Vise Feed Indexing for Continuous Accurate Bar Feeding
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Solution Overview
Problem
Existing bar feeders face accuracy issues due to slipping during continuous motion and speed limitations in intermittent motion, as they either rely on frictional forces that can lead to inaccuracies or have reduced efficiency due to constant gripping and repositioning of vises.
Innovation Solution
A system utilizing two shuttle vises operating in tandem to maintain constant deterministic contact and precise positioning, with a linear encoder providing feedback for coordinated movement to achieve continuous feeding with improved accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous motion bar feeder is used, then speed and efficiency are improved, but accuracy deteriorates due to slipping
Solution Approach 1:
The system divides the feeding function into multiple vises (at least two vises) that operate in sequence. One vise releases the stock while another simultaneously grips it, creating segmented zones of contact along the stock length. This allows continuous motion while maintaining deterministic contact at multiple points, preventing slipping and improving accuracy.
Solution Approach 2:
The system maintains continuous gripping contact with the stock throughout the feeding process by having multiple vises operate in overlapping cycles. As one vise releases, another is already gripping, ensuring no gap in contact. This continuous action eliminates slipping while maintaining high speed, resolving the contradiction between productivity and precision.
2Manufacturing precision
If intermittent motion bar feeder is used, then accuracy is improved by eliminating slipping, but speed deteriorates due to constant vises repositioning
Solution Approach 1:
The feeding function is segmented across multiple vises operating in parallel sequences. While one vise is repositioning, another is actively feeding the stock. This segmentation allows the system to maintain continuous forward motion (improving speed) while each individual vise operates in controlled intermittent cycles (maintaining accuracy).
Solution Approach 2:
The system performs preliminary gripping by one vise before another vise releases. This overlapping timing ensures that gripping contact is established in advance, eliminating idle periods and maintaining continuous motion. The preliminary action of one vise compensates for the repositioning of another, improving overall speed without sacrificing accuracy.
3Manufacturing precision
If multiple vises are used to maintain constant contact, then accuracy is improved, but device complexity increases
Solution Approach 1:
Multiple vises are merged into a coordinated system controlled by a single controller that synchronizes their operations. The vises work as an integrated team with overlapping cycles, where the control logic manages the complexity of coordination. This merging approach maintains simple individual vise designs while achieving complex multi-point contact for improved accuracy.
Solution Approach 2:
The vises operate in periodic, repeating cycles that are synchronized with each other. Each vise follows a simple periodic pattern of grip-move-release, but the periods are offset and overlapped to create continuous contact. This periodic action simplifies the control logic compared to continuous adjustment, reducing overall system complexity while maintaining accuracy.
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 enables continuous motion with enhanced accuracy and speed by ensuring constant contact and synchronized vise operation, overcoming the limitations of both continuous and intermittent feeders.
Implementation Method 1
a linear encoder providing feedback for coordinated movement
Implementation Method 2
The motive force used to transport the stock is provided by friction between the contact elements and the stock's surface
Data Source
AI summary
A material handling apparatus and a process for feed indexing. The process for feed indexing and processing of elongated stock includes the steps of gripping and moving an elongated stock with a first shuttle vise at a desired travel velocity toward a first final position. An open second vise accelerates from a second home start position until reaching the desired travel velocity. The second vise grips and moves the stock once the second vise is at the desired travel velocity while the first vise is gripping the stock. The first vise releases the stock and recycles to a first home position while the second vise moves the stock.