Method for creating a printed image on a rotating, three-dimensional body

US8974015B2 · kind B2 · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventor

• Joerg Fischer · Laboe, DE

Key dates

• Filing date: Jan 21, 2014
• Grant date: Mar 10, 2015
• Expiry date: Jan 21, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41M5/0088
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method for creating a printed image on a rotating, three-dimensional body or bottle eccentrically on a turntable, includes providing an inkjet printing unit having inkjet nozzles along a straight line for printing at a clock rate, rotating the body about a rotation axis parallel to the line using a motor, prescribing a fundamental frequency f0(t) for activating the motor, for example based on a constant angular velocity, activating the motor with the fundamental frequency f0(t), prescribing an average or constant body radius R0, determining a radius change ΔR(t) of the body during rotation, calculating a correction value k(t) for the printing unit clock rate, where k(t)=1+ΔR(t)/R0, and activating the printing unit with a frequency f(t) for the clock rate, where f(t)=f0(t)·k(t), for example permitting printing on eccentrically rotating bottles with a constant print resolution while avoiding image imperfections.