Conveyance method and conveyance apparatus
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United States of America Patent
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Jul 28, 2020
Grant Date -
Sep 12, 2019
app pub date -
May 23, 2019
filing date -
Nov 25, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A conveyance method of conveying a conveyance target object by loading the conveyance target object on a slider, wherein the slider is connected to a ball nut threadably engaged with a ball screw shaft, includes a step of rotating the ball screw shaft by an electric motor, a step of applying a braking force which is a rotation resistance to the ball screw shaft by a non-electric resistance changing unit, and a step of setting at least one of a driving force of the electric motor and the braking force of the resistance changing unit so that the slider will stop when a predetermined external force acts on the slider during conveyance and changes the slider to an overload state regardless of the presence/absence of the conveyance target object loaded on the slider and a weight of the conveyance target object.
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