Patent ID: 9199272
Filing Date: 2015-12-01
Classification: B05D,B29C,B41C,B41J

Abstract:
1. A system for preparing a print master with a marking engine, the system comprising: a cylindrical support including a longitudinal axis; and a marking head arranged to mark at least one layer of marks on the cylindrical support; wherein the cylindrical support rotates around the longitudinal axis relative to the marking head at a first speed, the first speed defining a first speed vector that is tangential to the cylindrical support; the marking head moves along a direction Y parallel to the longitudinal axis at a second speed that is linked to the first speed, the second speed defining a second speed vector; a sum of the first speed vector and the second speed vector defines an angle α with regard to a tangential line that is orthogonal to the longitudinal axis of the cylindrical support; the marking head includes N (N>1) parallel rows of marking elements that create the marks along interlaced spiral paths around the longitudinal axis; each row of the marking elements including a marking pitch P; the marking elements in different rows being interlaced to increase resolution of the marking head by a factor of N; a distance in a direction orthogonal to the longitudinal axis between a first row of the marking elements having an index number i and a second row of the marking elements having an index number j being a non-zero value of D[i][j], the distance D[i][j] introducing uneven spacing between the interlaced spiral paths; a distance measured in a direction of the longitudinal axis of the cylindrical support between marking elements in the first and second rows is equal to m*P/N+r*D[i][j]*tan(α); m is an integer number; and 0.1<r<1.9, so that unevenness of the uneven spacing between the spiral paths is reduced or eliminated.