Scissor Testing Device Force Position Correlation
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Solution Overview
Problem
Current testing devices for scissors only monitor peak force required for cutting and do not provide information on force variations throughout the cutting process or the location along the blades where peak forces occur, leading to inaccurate assessments of sharpness and increased risk of injuries in food processing applications.
Innovation Solution
A testing device with a mount system for securing scissors, a position sensor to measure movement, and a load sensor to measure cutting force, which correlates the force required with the location along the blades, providing detailed force and position data for informed decisions on sharpening or replacing scissors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current testing apparatus are used to monitor scissors sharpness, then the peak force required for cutting can be measured, but no information is provided regarding force variations throughout cutting or blade position
Solution Approach 1:
The patent divides the cutting process into multiple measurement points along the blade length. The position sensor segments the blade into discrete locations, and the load sensor measures force at each segment, transforming a single peak force measurement into multiple localized force measurements throughout the cutting stroke.
Solution Approach 2:
The patent adds a spatial dimension to the force measurement by incorporating position sensing along the blade length. This transforms a one-dimensional force measurement (single peak value) into a two-dimensional measurement space (force vs. position), enabling identification of where along the blade the peak force occurs and how force varies at different locations.
2Productivity
If duller blades are used for cutting, then cutting can still be performed, but inaccurate cuts and increased pressure cause injuries to workers
Solution Approach 1:
The patent implements a feedback system where the testing device measures force and position data, processes this information to determine blade sharpness status, and provides feedback that indicates when blades need sharpening or replacement. This feedback loop enables proactive maintenance before dangerous conditions develop.
Solution Approach 2:
The patent performs preliminary testing of blade sharpness before actual use in production. By measuring force requirements in advance through the testing device, the system identifies dull blades before they are used for cutting, preventing inaccurate cuts and injuries that would occur during actual operation.
3Productivity
If repetitive use of scissors is required in food processing applications, then productivity is maintained, but increased pressure from dull blades causes musculoskeletal injuries
Solution Approach 1:
The testing device enables self-monitoring of blade condition by the cutting system itself. Rather than requiring external inspection or estimation, the system automatically measures force and position parameters and determines when blades require maintenance, allowing the system to service itself and alert operators to potential hazards.
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 allows for accurate assessment of scissors sharpness by correlating cutting force with blade location, reducing the risk of injuries and musculoskeletal issues by enabling timely sharpening or replacement, thereby improving precision and safety in food processing environments.
Implementation Method 1
a load sensor associated with the mount device for measuring a load required for the scissors to cut the test media
Implementation Method 2
a position sensor associated with the mount device for measuring movement of the second grip end
Data Source
AI summary
A testing device and method for testing scissors are disclosed. The testing device includes a mount device. The mount device includes a first mount feature for mounting a first grip end of the scissors thereon and a second mount feature movable with respect to the first mount feature for mounting a second grip end of the scissors thereon. The testing device additionally includes a feed device positioned to provide a test media between a first blade and a second blade of the scissors. The testing device further includes a position sensor associated with the mount device for measuring movement of the second grip end, and a load sensor associated with the mount device for measuring a load required for the scissors to cut the test media.