Abstract: A laser machining control method using a numerical control system for controlling an X-Y table. A command program (2) in a memory is read out for each one block to cause a lamp on an operation panel (5) to be lit. An operator changes, sets and inputs an output power (S), a frequency (P) and a pulse duty (Q) depending on required conditions. The input conditions are applied to a high-frequency power source (6), and laser machining is carried out under these conditions.

Abstract: A laser beam machining device for machining a workpiece by irradiating a laser beam onto a surface of a workpiece is provided, and comprises a power sensor (21) for detecting the level of a reflected laser beam (11) fed back to a laser oscillator due to a reflection thereof by the surface of the workpiece (10), and an abnormality detecting unit for stopping the operation of the laser oscillator and movement of the workpiece (10) and displaying an alarm at a display device (19) when the power level of the reflected laser beam (11) becomes higher than a predetermined value.

Abstract: A laser power controlling method in which a laser output is controlled by an NC instruction as a function of an instruction regarding the moving speed of a mechanical system. The moving speed instruction is inputted to a simulator approximated to the mechanical system with a first-order or second-order function, and based upon the results operated by the simulator, a laser instruction value is generated, so that synchronism between the moving speed of the mechanical system and the laser output control is assured. Therefore, the moving speed of the mechanical system is synchronized with the power of the laser beam projected onto a workpiece to thus enhance cutting performance.

Abstract: A digitizing method in which a distance from a model surface is measured and stored at regular intervals of time or distance to obtain digital profile data of the model. A specified profile for correction is provided on a part of the model, and by using the specified mode, correction data such as a distance correction coefficient is obtained before carrying out the digitizing. Digitizing data obtained by carrying out the digitizing is corrected by the correction data. The correction data is obtained based on the material and surface condition of the actual model, and therefore, the digitizing data can be accurately corrected.

Abstract: There is disclosed a method of correcting the laser beam output power of an NC laser beam cutting machine composed of a computerized numerical control (CNC) apparatus and a laser beam cutting machine. When a laser is initially energized, a correcting coefficient is determined from a laser beam output power command value and an actual laser beam output power by a correcting means (11), and the actual laser beam output power is measured at each periodic interval of time by an output measuring device (33). The NC laser beam cutting machine is controlled by a command control means (13) to eliminate the difference between the laser beam output power command value and the actual laser beam output power. When the laser is initially energized, a long-term variation in the laser beam output power is corrected, and when an actual cutting operation is carried out, a short-term variation in the laser beam output power is corrected, so that the laser output power can be produced accurately.

Abstract: In a piping system for a laser oscillator (1), there are provided gas medium circulating pipes (211, 212, 213, 214) connected with a laser discharge tube (11) for circulating the gas medium therethrough, a gas medium circulating pump (23) arranged in the gas medium circulating pipes, a gas medium supply pipe (217, 218) for supplying a gas medium to the gas medium circulating pipes, a gas medium exhaust pump (24) arranged in a gas medium exhaust pipe and driven by a drive device for exhausting the gas medium in the laser discharge tube and the gas medium circulating pipes, and a control device (7) for controlling the operation of the laser oscillator piping system, the control device receiving a signal from the pressure sensor and generating a signal to be supplied to the gas medium exhaust pump and a signal to be supplied to a display device (6).

Abstract: A laser oscillator device applies a high-frequency voltage to a plurality of discharge regions through a dielectric for producing a high-frequency discharge for laser pumping. Various interferences in the laser oscillator device are prevented to allow the device to produce a stable output. The laser oscillator device includes DC power supplies (DC12a, DC13a, DC13c, DC13d) and high-frequency power supplies (RF12b, RF13b, RF14b, RF15b) which are integrally coupled to prevent electromagnetic interference through cables for allowing stable laser oscillation and also to prevent various other interferences.

Abstract: A laser oscillator device applies a high-frequency voltage to a plurality of discharge regions through a dielectric for producing a high-frequency discharge for laser pumping. The laser oscillator device includes a DC power supply (16), and a high-frequency power supply (18, 19, 20, 21) for converting a DC voltage into a high-frequency voltage. The DC power supply (16) and the high-frequency power supply (18, 19, 20, 21) are coupled to each other by a filter (30). The filter (30) prevents a high-frequency component from being fed back from the high-frequency power supply (18, 19, 20, 21) to prevent the laser oscillator device from operating unstably due to parasitic oscillation. Other arrangements are disclosed for preventing interference between the high-frequency power supply and the DC power supply.

Abstract: A laser oscillation control system performing laser beam machining by controlling an X-Y table by a numerical control system.An output of a laser oscillator is controlled by a G-code included in a program from a command system input to a numerical control system. An output power is commanded by an address S, a frequency by an address P and a pulse duty by an address Q. These command data are fed to a high-frequency power source to control a laser output.

Abstract: A laser oscillator control circuit controls a command voltage to control the output power of a laser. The laser oscillator control circuit has pulse generating means (8) that employs a timer for generating a pulse train in response to a signal from time setting means (5, 6) which sets an on-time and an off-time. The laser oscillator cotnrol circuit also has bias command voltage setting means (9) for setting data defining a bias command voltage at which an electric discharge can be started, and output voltage setting means (10) for setting data defining an output power voltage which is the sum of the output power and the bias command voltage. A selector (11) selects and outputs the output power voltage when the pulse train is on and selects and outputs the bias command voltage when the pulse train is off. The output from the selector is converted by a D/A converter (12) into an analog voltage to control a high-frequency power supply (21).

Abstract: A laser oscillator device applies a high-frequency voltage to a plurality of discharge regions through a dielectric for producing a high-frequency discharge for laser pumping. The laser oscillator device has current detectors (CT2a, CT2b) for detecting currents flowing from high-frequency power supplies (26a, 26b) into discharge tubes (1). The current detectors are disposed in positions to detect mutual currents between the adjacent discharge tubes. The currents detected by the current detectors (CT2a, CT2b) are used as feedback currents for preventing uncontrollable conditions of the currents due to a coupling current. The laser oscillator device also has a mechanism for preventing interference in the discharge regions.

Abstract: A laser device has a plurality of electrodes mounted on an electric discharge tube and high-frequency power supplies connected respectively to the electrodes. The laser device comprises output detecting means (6, 7) for detecting output conditions of the high-frequency power supplies, respectively, fault detecting means (1b) for detecting the failure of a high-frequency power supply from the output conditions detected by the output detecting means (6, 7), and on/off switching means (1a) for turning off the failing high-frequency power supply in response to a failure signal from the fault detecting means (1b). When one of the high-frequency power supplies (21) fails, its output is cut off, and the operation of the laser device is continued by the remaining normal high-frequency power supplies.

Abstract: A copy machine toner fixing device is provided having a plurality of rollers in which adjacent rollers are in contact under pressure, wherein at least one of the rollers is covered with a non-adhesive coating layer and copy paper carrying toner images thereon is passed between the rollers to fix the toner images on the paper, characterized in that the coating layer is an open celled, cellular plastic film wound around the periphery of the roller. A preferred film is expanded, porous polytetrafluoroethylene. The outer surface of the coating layer may advantageously be rendered non-porous by application of compression forces externally to the coating layer. Electroconductive filler may be advantageously incorporated into the open celled plastic film.

Abstract: The present invention is to permit accurate detection of the position of a movable machine part which is driven by a motor, through elimination of the influence of backlash.A position sensor (3) creates position sensing pulses each time a movable machine part (2) which is driven by a motor (1) is moved by a predetermined amount. Counting means (4) counts the position sensing pulses from the position sensor (3) and readout means (5) reads out the count value of the counting means (4) at predetermined time intervals. Cancel means (6) cancels the contents of the counting means (4) by a value equal to the count value read out by the readout means (5).

Abstract: The present invention is intended to improve the machining accuracy of tracer control which moves a tracer head and a model relative to each other along a path specified by numerical information.Profile arithmetic means (4, 5, 30 to 33) creates a velocity signal (V.sub.a) in a tracing feed direction and a velocity signal (V.sub.z) in the Z direction on the basis of displacement signals (.epsilon..sub.x, .epsilon..sub.y, .epsilon..sub.z) from the tracer head (1) and direction signals (sin .alpha., cos .alpha.) indicating the tracing feed direction, which are supplied from direction signal generating means (36). Velocity signal generating means (18, 19) derives command pulse signals in the X and Y directions from numerical information indicating the path of travel of the tracer head (1) and the velocity signal (V.sub.a) in the tracing feed direction produced by the profile arithmetic means (4, 5, 30 to 33).

Abstract: A plurality of path patterns (MCR.sub.1 -MCR.sub.3), in which at least data specifying tracing areas serve as variables, are registered in a memory (102) beforehand, tracer machining data including call instructions (MCC.sub.1 -MCC.sub.3) for calling a predetermined path pattern, as well as actual numbers, are stored in a memory (101) in advance, and tracer machining data are read block-by-block to perform tracer control. When a path pattern call instruction is read, the predetermined path pattern is read out of the memory (102), the variables are replaced by actual numbers to obtain a tracing area, and tracing is performed in the tracing area on the basis of the read path pattern.

Abstract: A clamp profiling control method in which a profiling feed operation, a profiling starting point return operation and a pick-feed operation are performed alternately, and in which a clamp feed is performed at a set clamp level (LCZ), which method includes specifying a clamp region (H1) by storing an initial position (A) at which clamp feed is performed and a position (B) at which clamp feed is no longer performed during the course of profiling feed, executing repetitive clamp profiling control within the clamp region while changing the clamp level (LCZ) and, when the clamp feed is no longer performed even once in the course of clamp profiling control, setting the clamp level to an initial value and proceeding to the next profiling region where the profiling feed operation, profiling starting point return operation and pick-feed operation are performed.

Abstract: A tracer control method whereby a tracer machining inhibit area is set and tracer machining is performed while skipping the machining inhibit area, the method including presetting a tracer machining inhibit area (TMI) and a safe level (ZL.sub.s) after taking into account the shape of a model (MDL). The method also includes moving a tracer head along the surface of the model to perform tracer machining in an area (TM), inhibiting tracer machining when the tracer head reaches the machining inhibit area (TMI), and raising the tracer head to the safe level (ZL.sub.s). After reaching the safe level the method includes moving the tracer head along the safe level to a boundary of the machining inhibit area after the tracer head reaches the safe level, thereafter performing an approach operation, and resuming tracer machining in an area (TM') after the approach is completed.

Abstract: The present invention pertains to a tracer control system for a system performing tracing in an arbitrary direction using a combination tracer control-numerical control unit which is a combination of a tracer control unit and a numerical control unit, and is intended to increase the cutting accuracy and cutting speed by controlling the feed by tracer control, as compared with a conventional system which controls the feed by numerical control.The numerical control unit is provided with a signal generating device, such as a controller, for generating a signal representing the angle of a feed shaft according to numerical information indicating a path of cutting.

Abstract: A method of sensing the current position of a movable element in a position control system which includes first and second control devices each having command pulse generating means and error storage means for computing and storing an error between a number of command pulses and a number of feedback pulses indicative of an amount of motor movement, a speed control circuit for driving and controlling the motor on the basis of the error in the storage means, and a switching circuit for selectively connecting the first and second control devices to the speed control circuit, the current position of the movable elements being sensed by the first control device when the second control device is connected to the speed control circuit.