Overload safety device
AssigneeTakayuki Nomura
InventorsHitoshi Amano, Yoshifumi Tsuchiya
Life of this patent
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Abstract
An overload safety device is provided for use on a feed mechanism to control the feed of such devices as a headstock, tool rest, or rotary table. The overload safety device includes a mounting means for maintaining a feed screw in a fixed position with respect to an axis of rotation of the screw and for permitting the screw to move a predetermined distance along the axis in response to a load placed thereon. The safety device further includes control means responsive to the movement of the screw for producing a control signal when the movement of the screw exceeds the predetermined distance, thus indicating an overload condition.
Claims4
An overload safety device for a machine having a feed screw and a body comprising:
- a first sleeve mounted to said feed screw to move axially therewith relative to said body;
- a second sleeve slidably mounted to the outer periphery of said first sleeve and the inner periphery of said body;
- a first spring between said first and second sleeves biasing said first sleeve in a first axial direction relative to said second sleeve;
- a second spring between said second sleeve and said body biasing said second sleeve in an axial direction opposite said first axial direction;
- and
- a switch mounted to said body to detect movement of said feed screw and first sleeve in both axial directions.
Dependencies are inferred from the claim text.