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US 12,220,777 B2Granted
Screw tightening defect determination device and learning device
AssigneeOMRON Corporation
InventorsTatsuya Sasaki, Takanori Shibutani
Life of this patent
Estimating the term…
Abstract
Even when a tapping screw is used in a soft material, it is determined whether or not a screw tightening defect has occurred. A PLC (10) comprises a determination unit (13) which for a rotational torque data sequence having a predetermined number of data points, generates a normalized torque data sequence that is the amount of change with respect to rotational torque at a first data point of the data sequence, and determines whether screw tightening is defective, on the basis of the normalized torque data sequence.
Claims7
A screw tightening defect determination device, comprising:
- a determination unit which, among data points sampling, at a predetermined cycle, a rotary torque of a motor that generates a rotary movement of a driver for tightening a screw and around an axis, generates a normalized torque data sequence that is an amount of change with respect to the rotary torque at an initial data point of a data sequence for the data sequence, the data sequence being a data sequence of the rotary torque formed by data points of a predetermined number and ending with a data point at which the rotary torque is equal to or greater than a predetermined first threshold, and
- the determination unit determines whether a defect occurs in screw tightening based on the normalized torque data sequence.
Dependencies are inferred from the claim text.