Screw-Driven Gripper Linkage for Precision Jaw Positioning
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Solution Overview
Problem
Conventional grippers for robot arms lack precision in positioning mechanical griping jaws, leading to errors and increased risk of falls during operation, especially when gripping thin workpieces, due to unguided jaw movement and inefficient force application.
Innovation Solution
A device comprising a screw, linkages, and linear movement modules with precisely angled and spaced axes and slide rails, allowing the griping jaws to move radially with consistent force application and reduced risk of deviation, ensuring precise positioning and stable grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gears and racks are used to drive griping jaws, then the gripper can grip or release articles, but positioning precision of the griping jaw deteriorates
Solution Approach 1:
The patent replaces the traditional gear and rack mechanical transmission system with a screw-nut linear motion transmission system. The screw thread converts rotational motion into precise linear motion, providing superior positioning accuracy compared to gear-rack mechanisms while maintaining the gripping function. This substitution directly addresses the positioning precision problem identified in the contradiction.
2Device complexity
If griping jaws are not properly guided, then the structure is simpler, but the risk of errors and falls during griping operation increases
Solution Approach 1:
The patent introduces guiding structures that act as intermediaries between the screw-nut transmission mechanism and the griping jaws. These guides ensure that the jaws move along precise trajectories without deviation, preventing errors and falls during operation. The guiding structures mediate the motion transmission, maintaining reliability without significantly increasing overall system complexity.
3Stability of the object's composition
If wedge hook is used to convert axial movement to radial movement, then gripping level stability is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent replaces the wedge hook mechanism with a direct screw-nut linear motion system. The screw thread inherently converts rotational motion to linear motion with high mechanical efficiency, eliminating the need for intermediate wedge conversions. This substitution maintains gripping level stability while significantly improving energy efficiency by reducing the force requirements and eliminating energy-wasting conversion steps.
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 solution provides precise positioning of griping jaws, reduces errors and falls, and maintains consistent gripping force across varying distances, enhancing the reliability and efficiency of gripper operations.
Implementation Method 1
a screw, having a first segment and a second segment, wherein the first segment is connected to the first board; a second board, being connected to the second segment and having a plurality of slots; a driving board, having a nut portion that is mounted around the screw and when driven by the screw drives the nut portion to move
Implementation Method 2
a plurality of linkages, each having: a first link whose two ends are defined with a first axis and a second axis, respectively, wherein the first link is pivotally connected to the second board at the first axis; and a second link, being defined with a third axis, a fourth axis, and a fifth axis, wherein the second link is pivotally connected to the driving board at the third axis, and the second link is pivotally connected to the second axis of the first link at the fourth axis
Implementation Method 3
a plurality of linear movement modules, each having a slide rail and a slider, wherein the slide rails are distributed over the second board in radial directions of the screw, and the sliders are mounted on the slide rails to be limited to move along the slide rails
Data Source
AI summary
A device for driving mechanical griping jaws includes a first board; a screw connected to the first board; a second board connected to the screw and having slots; a driving board mounted around the screw; linkages each having: a first link with a first axis and a second axis, wherein the first axis is pivotally connected to the second board, and a second link with a third axis, a fourth axis and a fifth axis, wherein the third axis is pivotally connected to the driving board, and the fourth axis is pivotally connected to the second axis; connecting boards each being pivotally connected to the fifth axis and passing the corresponding slot; and linear movement modules each having a slide rail and a slider moving along the slide rail and being connected to the connecting board, so as to precisely position the griping jaws and eliminate griping errors.