Pantograph type robot arm
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United States of America Patent
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Jun 12, 1990
Grant Date -
N/A
app pub date -
Jun 27, 1989
filing date -
Jul 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pantograph type robot arm having a linkage for connecting a movable member such as a movable welding electrode to a support member. The pantograph type robot arm includes two blocks supported by the support member movably in a direction perpendicular to a straight line, toward and away from each other in a symmetric manner with respect to the straight line. The linkage includes a pair of proximal link bars pivotally connected to the blocks such that the proximal link bars are pivotally connected to each other at their intermediate portions, and a pair of distal link bars pivotally connected to the movable member and to the proximal link bars so that the movable member is moved relative to the support member when the two blocks are moved relative to each other. A pivoting mechanism is provided in pivotal connection to one of the distal link bars of the linkage and the movable member, for effecting a relative pivotal movement of the one distal link bar and the movable member, by an angle equal to an angle of pivotal movements of the one distal link bar, in a direction opposite to a direction of the pivotal movements of the one distal link bar.
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