Robot Hand Differential Screw for Blade Inclination Adjustment
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Solution Overview
Problem
Conventional robot hands face difficulties in adjusting the inclination of the blade defining the holding position for substrates, and conventional fixing devices struggle with securing differential screws precisely.
Innovation Solution
A robot hand with a differential screw mechanism that includes a first and second threaded part with different pitches, allowing easy adjustment of the blade inclination, and a fixing device with a deformable intervening member to eliminate backlash and secure the differential screw without axial force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional fixing device is used to secure a differential screw, then the differential screw can be secured, but the differential screw may move in the middle of securing and cannot be precisely secured
Solution Approach 1:
A fixing member is introduced as an intermediary element between the differential screw and the base body. This fixing member includes a through-hole that receives the differential screw and eliminates backlash in the threaded engagement, providing precise and reliable securing without allowing movement during the securing process
Solution Approach 2:
The pitch of the threaded engagement is changed by using a fixing member with a different thread pitch than the differential screw. This parameter change allows the fixing member to eliminate backlash and securely fix the differential screw in position, preventing any movement during securing
2Ease of operation
If conventional robot hands are used, then the substrate can be held, but it is difficult to adjust the inclination of the blade defining the holding position
Solution Approach 1:
The blade's inclination is made adjustable rather than fixed. The differential screw mechanism allows dynamic adjustment of the blade's angular position relative to the base body, enabling easy inclination adjustment while maintaining structural integrity through threaded engagement
Solution Approach 2:
The robot hand is segmented into separable components: the base body, the blade, and the differential screw. This segmentation allows independent adjustment of the blade's inclination by rotating the differential screw, making the adjustment process simple while maintaining overall structural coherence
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 robot hand enables easy adjustment of the blade inclination and precise securing of the differential screw, reducing work time and effort, and ensuring accurate positioning of substrates.
Implementation Method 1
a differential screw having a center axis perpendicular to a principal surface of the substrate existing at the holding position and configured to attach the base part of the blade to the base body. The differential screw includes a first threaded part having a first pitch, a second threaded part having a second pitch different from the first pitch
Implementation Method 2
The differential screw includes a first threaded part having a first pitch, a second threaded part having a second pitch different from the first pitch, and an intervening member coaxially having a third threaded part to be threadedly engaged with the first threaded part, and a fourth threaded part to be threadedly engaged with the second threaded part
Data Source
AI summary
A robot hand to hold a substrate, which includes a base body, a blade defining a holding position for holding the substrate and attached at a base part to the base body, and a differential screw having a center axis perpendicular to a principal surface of the substrate existing at the holding position and configured to attach the base part of the blade to the base body. The differential screw includes a first threaded part having a first pitch, a second threaded part having a second pitch different from the first pitch, and an intervening member coaxially having a third threaded part to be threadedly engaged with the first threaded part, and a fourth threaded part to be threadedly engaged with the second threaded part. The first threaded part is provided to the base body, and the second threaded part is provided to the base part of the blade.