Patent ID: 9085129
Filing Date: 2015-07-21
Classification: B41C,B41J

Abstract:
1. A system for preparing a print master with a marking engine, the system comprising: a cylindrical support having a central axis; and a marking head unit to mark at least one layer of marks on the cylindrical support; wherein the cylindrical support is arranged to rotate around the central axis relative to the marking head unit at a first speed, a rotation of the cylindrical support including a first speed vector that is tangential to the cylindrical support; the marking head unit is arranged to move along a slow scan direction parallel or substantially parallel with the central axis at a second speed that is locked to the first speed, a movement of the marking head unit including a second speed vector that is in a same plane as the first speed vector; an angle between the first speed vector and a sum of the first speed vector and the second speed vector has a value α; the marking head unit includes at least two parallel or substantially parallel rows of marking elements that create marks along interlaced spiral paths around the central axis, a distance between the at least two parallel or substantially parallel rows of marking elements introduces uneven spacing between the spiral paths; the at least two parallel or substantially parallel rows of marking elements are rotated by an angle β in a plane that is parallel with the first speed vector and the second speed vector, a rotation of the at least two parallel or substantially parallel rows takes place in a direction that is orthogonal with a tangent of the spiral paths so that the uneven spacing between the spiral paths is reduced or eliminated; and