Abstract: In a machine for etching objects, a nozzle assembly carries out an oscillating movement transverse to the conveying direction, in which the objects to be etched are guided through the machine. The device, which produces the oscillating movement, comprises a drive motor, whereof the rotary movement is converted by means of a cam disc into the oscillating movement of the nozzle assembly. The cam disc, on whose outer contour pressure engagement members of the nozzle assembly bear against two diametrically opposed points, has the contour of a cardioid. Due to this, a particularly linear displacement-time characteristic of the oscillation movement between the reversing points is achieved, which contributes to making the etching process more uniform.

Abstract: A machine for treating objects with a treatment liquid, in particular with an etching medium, comprises a nozzle assembly, which is able to move to and fro in the manner of a drawer between a working position within the housing and a maintenance position outside the housing. In the maintenance position, nozzles located on the nozzle assembly are easily accessible for cleaning, for alignment or for being exchanged. A plug-in coupling, by which the nozzle assembly is supplied with the treatment liquid, is automatically detached when the nozzle assembly is moved out and re-closes when the nozzle assembly is guided back into its working position.