Power transmission device in industrial robots
First Claim
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1. In a power transmission device for use in industrial robots, said power transmission device including a rotatably mounted drive screw which is adapted to being rotated by a motor;
- a nut means which is mounted on said drive screw to be movable therealong in a plane when said drive screw is rotated, said nut means having arms on opposite sides which mount respective journalling pins which are parallel to one another;
a driven member which is movable along a predetermined path in said plane;
a pair of parallel links, each of said links having first and second ends, the first end of each of said links including a ball bearing which is rotatably mounted to a respective journalling pin and the second end of each of said links being connected to said driven member,the improvement wherein said power transmission device includes a torsionally stiff member rigidly connected between said parallel links so as to eliminate any relative angular displacement therebetween.
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Abstract
A power transmission device includes a rotatably mounted drive screw, a nut element which is movable along the drive screw, and a pair of links which connect the nut element to a driven member. The links are rigidly connected to each other by a torsionally stiff member to prevent relative angular movement therebetween.
5 Citations
3 Claims
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1. In a power transmission device for use in industrial robots, said power transmission device including a rotatably mounted drive screw which is adapted to being rotated by a motor;
- a nut means which is mounted on said drive screw to be movable therealong in a plane when said drive screw is rotated, said nut means having arms on opposite sides which mount respective journalling pins which are parallel to one another;
a driven member which is movable along a predetermined path in said plane;
a pair of parallel links, each of said links having first and second ends, the first end of each of said links including a ball bearing which is rotatably mounted to a respective journalling pin and the second end of each of said links being connected to said driven member,the improvement wherein said power transmission device includes a torsionally stiff member rigidly connected between said parallel links so as to eliminate any relative angular displacement therebetween. - View Dependent Claims (2, 3)
- a nut means which is mounted on said drive screw to be movable therealong in a plane when said drive screw is rotated, said nut means having arms on opposite sides which mount respective journalling pins which are parallel to one another;
Specification