Method for defining a laser control signal for various types of lasers and laser plotters, and galvo marking lasers therefor
The present disclosure relates to a laser plotter, a galvo marking laser and a method for defining a laser control signal for a laser source for various types of laser machines, for cutting, engraving, marking and/or lettering of a workpiece, in which at least one laser source is used in a housing of the laser machine type for processing a workpiece. A PWM signal for controlling the laser source is generated by a control unit. The workpiece is deposited on a processing table and the processing of the workpiece carried out line by line, whereby a separate PWM signal for driving the laser source is generated for each line. At a defined edge, a correction process is carried out to generate a modified PWM signal, wherein the correction process determines the preceding pause duration and the pulse duration, from which a correction value and a correction factor, respectively, are determined.
1 . A method for defining a laser control signal for a laser source for various laser machine types for cutting, engraving, marking and/or lettering of a workpiece, in which at least one laser source for processing a workpiece is used in a housing of the laser machine type, wherein a PWM signal for controlling the at least one laser source is generated by a control unit from set parameters and/or a loaded job, wherein the workpiece is deposited on a processing table and the processing of the workpiece is carried out line by line, wherein, for each line a separate PWM signal is generated for controlling the at least one laser source, wherein at a defined edge of a first PWM signal, a correction process is carried out for generating a modified second PWM signal, whereby the correction process modifies a preceding pause duration and a pulse duration, from which a correction value and a correction factor, respectively, are determined, and wherein the second PWM signal is modified by extending the first PWM signal having the pulse duration by the correction value after which a subsequent pause duration is determined by the correction process from the second PWM signal up to a third IM signal.
2 . The method according to claim 1 , wherein, after the start of the correction process, a duration of the preceding pause duration and the duration of the pulse duration of the second PWM signal are first determined.
3 . The method according to claim 1 , wherein, depending on the length of the duration for the laser pause or pause duration, respectively, the correction value or the correction factor are determined for the second PWM signal based on a length of the preceding pause duration of the pulse duration, respectively.
4 . The method according to claim 1 , wherein the correction process is carried out in a separate control module.
5 . The method according to claim 1 , wherein the correction process in a pulse generator is carried out after the generated second PWM signal.
6 . The method according to claim 5 , wherein the correction process is integrated before the pulse generator directly during the generation of the second PWM signal.
7 . The method according to claim 1 , wherein the correction process is integrated into the control unit or the laser source.
8 . A laser plotter for engraving, marking and/or lettering of a workpiece, which comprises a processing chamber for positioning the workpiece, the at least one laser source with corresponding deflection elements and a movable focusing unit and the control unit for controlling a carriage, which is operated via a belt drive and has a focusing unit movably arranged thereon, wherein the laser plotter, a PWM generator, a pulse generator, a control module or the at least one laser source, is configured to define a laser control signal or the modified second PWM signal, respectively, for the at least one laser source, for cutting, engraving, marking and/or lettering of the workpiece by the correction process according to claim 1 .
9 . A galvo marking laser for engraving, marking and/or lettering of a workpiece, which comprises a processing chamber for positioning the workpiece, the at least one laser source with corresponding deflection elements and a movable focusing unit and the control unit, wherein the galvo marking laser, a PWM generator, a pulse generator, a control module or the at least one laser source, for defining a laser control signal or the modified second PWM signal for the at least one laser source, for cutting, engraving, marking and/or lettering of the workpiece by the correction process according to claim 1 .