Overtravel detecting device for an industrial robot
AssigneeFanuc Corporation
InventorsRyo Nihei, Kazuhisa Otsuka, Hideki Sugiyama
Life of this patent
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Abstract
An overtravel detecting device, mounted on an angularly movable shaft of an industrial robot for mechanically determining and detecting the limits of rotation of the movable shaft, is attached to a rotating shaft (12) of a wrist portion (10) of an industrial robot and is provided with a pattern plate member (22) having two grooved paths (24) for setting the limits of rotation of the rotating shaft at predetermined position with respect to an origin position of the rotation, and a detecting element constituted by a limit switch (32) for transmitting an overtravel signal when the switch comes into contact with stop walls (24a, 24b) formed at ends of the two grooved paths for setting limits of rotation.
Claims7
An overtravel detecting device for detecting a limit of rotation of an industrial robot about an axis of rotation, comprising:
- an overtravel indicating means attached to a shaft body having said axis of rotation, and providing detectable ends at predetermined positions about said axis of rotation;
- and
- a detecting means arranged at a predetermined position around said shaft body, and provided with a detecting end suitable for coming into contact said detectable ends of said overtravel indicating means, said detecting means transmitting an overtravel signal in response to detection of the limit of rotation;
- said overtravel indicating means including a plate member, and being provided with two grooved paths substantially circumferentially extending around said axis of rotation of said shaft body so as to have a predetermined length, respectively, and stop wall portions, one being arranged at an end of each of said two grooved paths so as to function as said detectable ends, said plate member of said overtravel indicating means being integrally rotated with said shaft body to thereby move said detectable ends of said grooved paths relative to said detecting end of said detecting means.
Dependencies are inferred from the claim text.