Patent ID: 9259950
Filing Date: 2016-02-16
CPC Classification: B41J

Claim Text:
1. An ink printing apparatus, comprising: a printing unit and a printer controller for printing to a pre-folded printing substrate web, the printing unit comprising print bars having print heads and a drying route; a transport arrangement for the printing substrate web provided by the printing unit; an intake unit arranged at an intake of the transport arrangement, an infeed roller of the intake unit being provided at an intake for the transport arrangement in order to transport the printing substrate web to the transport arrangement; a synchronization sensor at the transport arrangement between the infeed roller and the printing unit and adjacent to the intake of the printing unit, said synchronization sensor emitting a respective synchronization signal when a fold of the printing substrate web is present at said synchronization sensor for synchronization of a printing operation with feed of the printing substrate web; a transport path between the synchronization sensor and a freely accessible point of the intake unit being designed such that a fold is present at the synchronization sensor when the printing substrate web has a fold at the freely accessible point of the intake unit; a sensor for measurement of relative humidity at the printing unit; and a measurement signal of the relative humidity by the sensor being compared in the printer controller with a relative humidity of an input stack of the printing substrate web to be inserted into the printing apparatus, and given a humidity deviation the printer controller calculating a length change of the printing substrate web between the synchronization sensor and the freely accessible point of the intake unit, the printing substrate web being displaced by the length change at the freely accessible point of the intake unit.