摘要:
A workpiece feeder for successively feeding workpieces to a predetermined workpiece gripping station of the robot's hand. The workpiece feeder includes a conveyor having a plurality of interspaced pallets traveling on a table. Each pallet comprises a lower plate having a central opening and an upper plate which is detachably mounted on the lower plate. The workpiece feeder is provided with a lifting means having a vertically movable platform which ascends through the central opening in the lower plate to lift the upper plate away from the lower plate, thereby elevating the workpiece on the pallet up to the level of the gripping position of the robot's hand. The workpiece feeder further comprises a stop mechanism for limiting the topmost position of the platform. The workpiece feeder according to the invention is particularly suitable for use with an industrial robot of the simplified type in which the upright stand enabling the robot's hand to perform vertical translational movement is omitted.
摘要:
An adaptive proportional-plus-integral control system for controlling a robot or a machine tool which is subject to large load variation. The PI control system comprises a speed control loop and a pre-compensator provided in the speed control loop. The pre-compensator is equivalent to a system which is the combination of a reference model and an inverse system of a servomotor, and has adaptivity. Since the pre-compensator is incorporated into the speed control loop, robust control can be made even if the inertia of a load is largely variable.
摘要:
The purpose of the invention is to properly determine the replacement time of a guard window of an arc sensor using an original function of the arc sensor.The apparatus for monitoring a guard window of an arc sensor according to the present invention is provided with an arc sensor guard window (28) mounted on an arc sensor unit (20) and a standard reflecting plate (30) located at a position a determined distance from the front surface of the guard window (28). And the apparatus detects the reflected light (27) from the standard reflecting plate (30) when a laser beam (26) scans the standard reflecting plate (30), before the guard window (28) is used for an arc welding operation. The apparatus memorizes the quantity of detected light reception as the first quantity. The apparatus then detects the reflected light (27) from the standard reflecting plate (30) in the same way as before, after the guard window (28) is used for an arc welding operation. The apparatus memorizes the quantity of detected light reception as the second quantity of detected light reception as the second quantity. Based on the difference between the first quantity and the second quantity, the condition of the guard window (28) is checked and it is determined whether or not the guard window (28) should be replaced.
摘要:
A compound drive mechanism (30) according to the invention is capable of driving an output element (10, 40) of an industrial robot for a linear motion along an axis and of rotating the output element (10, 40) independently of the linear motion of the output element (10, 40). The mechanism includes a linear-motion drive motor (M.sub.1) for driving the output element (10, 40) for linear motion, a rotation drive motor (M.sub.2) for driving the output element (10, 40) for a rotational motion arranged at a fixed position, a linear motion transmitting system (12 and 14; 42 and 44) for transmitting a linear motion to the output element (10, 40) a rotational motion transmitting system (18 and 20; 48 and 50) for transmitting a rotational motion to the output element (10, 40), and a rolling contact bearing (18, 46) interconnecting the linear motion transmitting means (12 and 14; 42 and 44) the rotational motion transmitting means (18 and 20; 48 and 50) to thereby obviate interference between those transmission systems.
摘要:
An operation control system for a scanning galvanometer associated with an arc sensor (20) of a welding robot for sensing a weld line, and having a swing mirror (23) integral therewith for a laser beam scanning. A memory (43) stores waveform data of a galvanometer drive command current obtained by synthesizing a constant-speed command current and an acceleration/deceleration command current, and an address circuit (42) causes the waveform data to be output from the memory (43) at predetermined intervals. A D/A converter (44) converts the output of the memory (43) to an analog value, and a scanner drive circuit (45) drives the galvanometer (22), which swings the swing mirror (23) to detect the weld line. Accordingly, the scanning galvanometer (22) is driven in accordance with the waveform of the galvanometer drive command current in such a manner that it is driven at a constant angular velocity in swing angle regions other than turning points, and at a constant angular acceleration in the vicinity of the turning points. Therefore, the swing angle is accurately controlled over the entire operating range, and the change of direction of the swing angle at the turning points is effected in a very short time. Further, overshoot does not occur at the turning points of the triangular wave, and as a result, the measurement for detecting the weld line by a laser beam scanning can be effectively executed.
摘要:
The feedback gain for motor control for a control system in which the inertia of a load is greatly variable is adjusted. First, a feedback gain (K1) is determined. The value of feedback gain is calculated from a servomotor itself or the like, and selected so that the control loop will not oscillate (S1). A feed-forward gain (K) is determined according to a learning process with the feedback gain (K1) (S2). Then, a feedback gain (K1) is calculated from the feed-forward gain (K) (S3). Thereafter, a feed-forward gain (K) is determined again according to a learning process based on the feedback gain (S4). The second feed-forward gain (K) and the feedback gain (K1) are used to establish a control system. In this manner, a control system having an optimum feed-forward gain and an optimum feedback gain can be established.
摘要:
A collision detecting method is provided which is capable of promptly detecting a collision of robot operating parts driven by servomotors, e.g., robot arms, with a foreign object. Prompt detection of such collisions aids in preventing or limiting damage to a machine, etc. by the collision. A digital signal processor of an axis controller (2) of FIG. 1, as part of a software servo system, calculates a velocity command and a torque command in accordance with a movement command supplied from a main computer (1), to periodically carry out servo control for individual axes of the robot. The digital signal processor also determines whether the torque command or a velocity deviation between the velocity command and an actual velocity of a servomotor (13b) is greater than a respective predetermined value. When the torque command or velocity deviation becomes greater than the respective predetermined value, the collision detecting method determines that a collision of the robot operating part (13a) with a foreign object or the like has occurred, and the operation of the servomotor is stopped.
摘要:
An industrial robot with a horizontal telescopic arm unit having an arm casing horizontally slidably mounted on a vertical upright column, a telescopic arm encased in the arm casing to be telescopically moved with respect to the arm casing and in synchronism with the horizontal sliding movement of the arm casing, and a common drive motor causing the horizontal linear sliding movement of the arm casing and the telescopic movement of the telescopic arm via a rotation to linear movement converting mechanism.
摘要:
An arc sensor (10) to be attached to an arc welding torch for detecting a welding spot is provided with an optical detecting system having an optical position detector (14), an objective lens (18), and a transparent objective window (20) arranged in front of the objective lens, and a plurality of arc light screening plates (22 and 24) made of an opaque material, and having a light transmitting apertures (22a and 24a), the plurality of arc light screening plates (22 and 24) being arranged in front of the transparent objective window (20) and spaced from one another for screening an arc light but permitting the detecting light beam to pass therethrough.
摘要:
The robot control apparatus according to the present invention is so adapted that, with regard to all kinds of motions commanded of a robot, the maximum velocity and time constant conforming to the type of robot motion can be designated for respective robot control axes (3) by a controller (1) which includes a selection table memory (4).