US 11,858,267 B2
Method for operating a CIJ printer with optical monitoring of printing quality, CIJ printer with optical monitoring of printing quality, and method for teaching-in a CIJ printer with optical monitoring of printing quality
Klaus Specker, Neuhausen (DE)
Assigned to PAUL LEIBINGER GMBH & CO. KG NUMMERIER-UND MARKIERUNGSSYSTEME, Tuttlingen (DE)
Appl. No. 17/436,437
Filed by PAUL LEIBINGER GMBH & CO. KG NUMMERIER-UND MARKIERUNGSSYSTEME, Tuttlingen (DE)
PCT Filed Dec. 10, 2019, PCT No. PCT/EP2019/084488
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/177912, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 19161144 (EP), filed on Mar. 6, 2019.
Prior Publication US 2022/0169022 A1, Jun. 2, 2022
Int. Cl. B41J 2/12 (2006.01); B41J 2/075 (2006.01); B41J 2/125 (2006.01)
CPC B41J 2/12 (2013.01) [B41J 2/075 (2013.01); B41J 2/125 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for operating a continuous inkjet (CIJ) printer with an optical monitoring means (80) having the steps
generating a bitmap (90, 180) of the printed image to be printed,
sequential controlling of charge electrodes (25) and/or deflection electrodes (30) of the CIJ printer to realize columns or lines of the bitmap (90, 190) by applying rows of ink droplets (12) arranged side by side that each form a stroke (40, 41) to a substrate to be printed (100) and to thus sequentially apply a real printed image (195) on the substrate (100),
capturing the real printed image (195) applied to the substrate (100) with the optical monitoring means (80), and
automated comparing of the bitmap (90, 190) of the desired printed image and the real printed image (195) applied to the substrate (100) and captured with the optical monitoring means (80),
characterized in that
the automated comparing of the bitmap (90, 190) of the desired printed image and the real printed image (195) applied to the substrate (100) is carried out either on the basis of rows or columns of the bitmap (90, 190) or on the basis of components of rows or columns of the bitmap (90, 190), so as to verify, after each stroke (40, 41) or during the execution of the stroke (40, 41), whether the individual ink droplets (12) or which the stroke (40, 41) consists were laced correctly after each stroke (40, 41) or during the execution of the stroke (40, 41), in order to establish whether the individual ink droplets (12) of which the stroke consists were placed correctly and reduce the number of incorrectly printed products.