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1. (WO1984004269) ARTICULATED ARM TYPE OF INDUSTRIAL ROBOT

Pub. No.:    WO/1984/004269    International Application No.:    PCT/JP1984/000218
Publication Date: Nov 8, 1984 International Filing Date: Apr 27, 1984
IPC: B25J 17/02
B25J 9/10
Applicants:
Inventors:
Title: ARTICULATED ARM TYPE OF INDUSTRIAL ROBOT
Abstract:
An articulated arm type of industrial robot has a movable robot body (11) provided on a base (10). The near end portion of an upper arm (13) provided with both a near end portion and a far end portion is pivotally attached to the robot body (11). A forearm (16) provided with a rear end portion and a front end portion is pivotally attached by a point between its rear and front end portions to the far end portion of the upper arm (13). A wrist device (20) is provided with two movable elements (21, 22) which can move with respect to the front end portion of the forearm (16) around, preferably, different axes. The movable elements (21, 22) of the wrist device (20) are rotated around their axes by wrist drive devices (27, 28), respectively. The wrist drive devices (27, 28) are provided with first sprocket wheels (29, 36), respectively, which are rotatably arranged within the rear end portion of the forearm (16). Drive motors (31, 37) for rotating the first sprocket wheels (29, 36), respectively, are provided in the rear end portion of the forearm (16). Second sprocket wheels (33, 39) which are linked to the movable elements (21, 22), respectively, of the wrist device (20) are arranged within the front end portion of the forearm (16). The rotations of the first sprocket wheels (29, 36) are transmitted to the corresponding second sprocket wheels (33, 39) by wound connectors (34, 45), respectively. The wound connectors (34, 45) are constituted by endless assemblies composed of chains (46, 47) and rods (48, 49).