Machine for generating optically variable image elements

US11858253B2 · kind B2 · utility

Assignee

• KOENIG & BAUER AG · DE

Inventors

• Edwin Kreps · Zellingen, DE
• Emmanuel Thony · Rennaz, CH

Key dates

• Filing date: Aug 18, 2021
• Grant date: Jan 2, 2024
• Expiry date: Aug 18, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F33/0009
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In some examples, a machine for generating optically variable image elements on a substrate includes a printing substrate infeed and a printing unit including a printing mechanism by which a substrate guided on a transport path is printed with a coating agent containing magnetic or magnetizable particles. A device for aligning the magnetic or magnetizable particles includes a first alignment device in the transport path and a further alignment device arranged upstream therefrom. During normal operation, the further alignment device is fixed to a frame at the transport path. The further alignment device includes a plurality of magnets that are spaced apart from one another transversely to the transport direction and, during operation, remain stationary. The number of magnets included in the further alignment device correspond to a number of columns of image-producing print motifs or groups of image-producing print motifs around a circumference of a forme cylinder.