Abstract: A assembled wrist for use on an industrial robot having a final-axis arm (2) includes passage (45) formed by first, second and third spaces arranged in series. The passage extends from a third driver tube (9) in the final-axis arm (2) to one end surface of a tool support portion (5). A protective member (50) has ends fixed and sealed to the third driver tube (9) and the tool support portion (5) respectively so that the protective member (50) may be disposed in the passage (45). The protective member has flexible components (62) at least near the fixed and sealed ends so that the flexible component (62) deforms according to the rotations of the third driver tube (9) and the tool support portion (5).

Abstract: Disclosed is herein a rotational position detector for a robot which can always accurately detect the rotational positions of each rotational member based on the output values from each absolute value detector regardless of the rotational conditions of the rotational member. Each absolute value detector (resolver) is connected to each rotational member such that the ratio of the rotational angle period of the absolute value detector to the rotational angle period of the rotational member is set to be 1:N (N is an integer larger than 1).

Abstract: An internal pressure explosion-proof system by which an electric motor or the like is not rendered operative until after gas in an airtight vessel is replaced with certainty by protective gas. The internal pressure explosion-proof system includes a gas flow detector provided in an exhaust pipe for detecting an amount of protective gas exhausted from an airtight vessel in which an electric appliance which may produce a spark or fire is accommodated, and a controller for enabling operation of the electric appliance when a flow amount detected by the gas flow rate detector when protective gas is fed into the airtight vessel reaches a predetermined level and the internal pressure of the airtight vessel exceeds another predetermined level.

Abstract: A painting system for an automobile for washing an automobile using a plurality of robots comprises a plurality of washing apparatus disposed in the proximity of robots for individually washing the robots. The robots operate in accordance with a program taught in advance and is automatically washed by the washing apparatus after a suitable interval of time.

Abstract: An internal pressure explosion-proof construction for an electrically-driven robot with which purging of airtight chambers of the robot in which electric motors are installed can be performed efficiently in a short time when air or inert gas is charged into the airtight chambers. The airtight chambers in which the electric motors are divided into a plurality of blocks, and an automatic opening and closing valve is provided at an outlet port connected to each of the blocks such that it may be opened only when the corresponding block is to be purged.

Abstract: A speed reduction clutch mechanism which enables construction of an inexpensive driving system of a simple structure and can be conveniently incorporated in a driving system of an arm of a robot of the direct teaching type. The mechanism includes a reduction gear including input and output shafts and a body frame supported for rotation around a common axis. The input shaft is connected to an output shaft of a motor. A first arresting mechanisms is provided for arresting rotation of the body frame of the reduction gear. When the first arresting mechanisms is not in its arresting condition, a second arresting mechanisms couples the body frame to the output shaft of the reduction gear thereby to establish an integrally rotating relationship between the output shaft of the reduction gear and the output shaft of the motor. A switching mechanisms alternately renders the first and second arresting mechanisms operative.