Abstract: In the marking apparatus in which the marking tool is vibrated by piezoelectric body vibrator and characters are engraved onto the objective material, the detection means detects the amplitude of piezoelectric body vibrator as the DC signal, and the drive control means adjusts the frequency of the drive signal so that the level of the DC signal detected by detection means is within a predetermined range, and drives piezoelectric body vibrator, and by appropriately adjusting the frequency to drive piezoelectric body vibrator, drives piezoelectric body vibrator with a predetermined amplitude. Accordingly, because the amplitude of piezoelectric body vibrator can be kept within a constant range, the stable resonance can be conducted. Further, the resonance can be conducted without being influenced by the resonance frequency of the tool.

Abstract: A marking apparatus with a CAD device which is highly productive due to the procedure of entering an image of a workpiece 1 as a marking diagram into the CAD device 40 and constructing a work program synthesizing the marking symbols/drawings onto the marking diagram. The position of the workpiece 1 can be adjusted by monitoring the screen because an image of the workpiece 1 is displayed on the display device 4N of the CAD device 40 as a marking diagram. Additionally, marking symbols/drawings of an arbitrary scale can be synthesized in cooperation with the marking diagram of the workpiece, since the scaling ratio of the image of the workpiece 1 is displayed on the display device 4N.