Arm coupling device i.e. rotary joint, for connecting start and end arms of perpendicular-multi-joint-type robot, has rotary joint part for transmitting electric signal via cable, where signal is provided from start arm side to end arm side

摘要

The device i.e. rotary joint (9), has a flat cable accommodated in a housing (41) and wound corresponding to an inner circumference of the housing, where the cable is longer than an outer circumference of the housing. The device transfers drive force of a drive source (12) to an end arm over a shaft (15) and discharges gas from a side of a start arm to the end arm through the gas passage provided between a sleeve (17) and the shaft. A rotary joint part (20) transmits an electric signal through the cable, where the signal is provided from the side of the start arm to the side of the end arm.