Machine tool collision detecting apparatus equipped with collision stress releasing device
AssigneeNakamura-Tome Precision Industry Co., Ltd.
InventorMasahiko KAKUMOTO
Life of this patent
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Abstract
A collision stress releasing device reversely rotates a feed motor by a return amount set in a return amount setter based on a contact position of a movement unit or a collision detection position regarded as a contact position. Generally, a large error does not occur even when the collision detection position is regarded as the contact position, but when the movement unit or the colliding member has low rigidity, a control of setting a return amount in response to the speed of the movement unit or a control of estimating an actual contact position from a rise curve of a load after a collision is more desirable.
Claims7
A machine tool collision detecting apparatus comprising:
- an emergency stop device which emergently stops a feed motor by outputting a collision detection signal when an operating load of a feed motor driving a movement unit reaches a collision detection setting load set by a setter;
- and
- a collision stress releasing device which reversely rotates the feed motor only by a return amount set by a return amount setter after the emergency stop of the feed motor,
- wherein the collision stress releasing device reversely rotates the feed motor only by the return amount set by the return amount setter based on a contact position of a member colliding with the movement unit.
Dependencies are inferred from the claim text.