Agfa NV

A printhead adjustment apparatus for adjusting the translation and rotation of a printhead is provided. The apparatus comprises a first portion and a second portion, each arranged for coupling to the printhead. The apparatus also comprises a first actuator coupled to the first portion by a first flexure arrangement and a second actuator coupled to the second portion by a second flexure arrangement. Translation of the first and second actuators in the same direction as each other causes translation of the first and second portions in the same direction as each other to provide translation of the printhead, while translation of the first and second actuators in opposite directions to each other causes translation of the first and second portions in opposite directions to each other to provide rotation of the printhead.

A sheet 200 for an array of vacuum apertures 152 in a substrate support unit 150 of a printer is provided. The sheet 200 comprises a plurality of valves 202 formed into the sheet 200 . The sheet 200 is made from a resilient material. Each valve 202 comprises a valve head 204 for sealing a vacuum aperture 152 in the substrate support unit 150 , and a valve lever arm 206 for permitting movement of the valve head 204 towards and away from the vacuum aperture 152 in order to open and close the valve 202.

An inkjet printer ( 500 ) for printing on cloth ( 300 ) comprising a first vacuum belt ( 150 ) for conveying an unwoven fabric ( 200 ) which is, configured as a second vacuum belt, for conveying under an inkjet print head ( 505 ) a cloth ( 300 ); and a device for applying pressure to said cloth ( 300 ) on said second vacuum belt; wherein said device comprises a portion for traversing said cloth ( 300 ) with a rub by a relative movement between said pressure device and said second vacuum belt, carrying said cloth ( 300 ).

A grayscale inkjet printing method including the steps of: a) supplying a pigmented inkjet ink to a grayscale print head having nozzles with an outer nozzle surface area smaller than 500 μm 2 and having an acoustic resonance period ARP of not more than 5.5 μs; and b) applying a voltage wave form for ejecting pigmented inkjet ink from a nozzle of the grayscale print head within one jetting cycle; wherein the pigmented inkjet ink has a viscosity of at least 3.8 mPa·s at jetting temperature and a shear rate of 1,000 s −1 ; wherein the voltage wave form for ejecting the largest ink droplet includes, in chronological order, a first ejecting pulse having an amplitude A1 and a second ejecting pulse having an amplitude A3 with the amplitude A1 complying with the relationship: 0.50×A3<A1<1.40×A3; and wherein a time period between the end time of the first ejecting pulse and the end time of the second ejecting pulse defines an idle time period including no other ejecting pulse, the time period having a duration between 1.5 to 2.5 times the acoustic resonance period ARP; and wherein any non-ejecting pulse having an amplitude A2 present during the idle time period complies with the relationship: A2≤0.15×A3. An inkjet printing system is also disclosed.

A grayscale inkjet printing method including the steps of: a) supplying a pigmented inkjet ink to a grayscale print head having nozzles with an outer nozzle surface area smaller than 500 μm 2 and having an acoustic resonance period ARP of not more than 5.5 μs; and b) applying a voltage wave form for ejecting pigmented inkjet ink from a nozzle of the grayscale print head within one jetting cycle; wherein the pigmented inkjet ink has a viscosity of at least 3.8 mPa·s at jetting temperature and a shear rate of 1,000 s −1 ; wherein the voltage wave form for ejecting the largest ink droplet includes, in chronological order, a first ejecting pulse having an amplitude A1 and a second ejecting pulse having an amplitude A3 with the amplitude A1 complying with the relationship: 0.50×A3<A1<1.40×A3; and wherein a time period between the end time of the first ejecting pulse and the end time of the second ejecting pulse defines an idle time period including no other ejecting pulse, the time period having a duration between 1.5 to 2.5 times the acoustic resonance period ARP; and wherein any non-ejecting pulse having an amplitude A2 present during the idle time period complies with the relationship: A2≤0.15×A3. An inkjet printing system is also disclosed.

An inkjet printer ( 500 ) for printing on cloth ( 300 ) comprising a first vacuum belt ( 150 ) for conveying an unwoven fabric ( 200 ) which is, configured as a second vacuum belt, for conveying under an inkjet print head ( 505 ) a cloth ( 300 ); and a device for applying pressure to said cloth ( 300 ) on said second vacuum belt; wherein said device comprises a portion for traversing said cloth ( 300 ) with a rub by a relative movement between said pressure device and said second vacuum belt, carrying said cloth ( 300 ).

A sticky-layer-cleaner for removing residues adhered to a sticky flat layer includes a receptacle for a cleaning-liquid and a cleaning-roll in contact with the sticky flat layer, wherein the cleaning-roll includes an elongated carpet fabric which is helically folded around the cleaning-roll and a pile of which includes yarn tufts in loop and/or cut configuration, and the cleaning-roll further includes a helical channel along the length of the folded carpet fabric for draining the cleaning-liquid from the cleaning-roll and/or for wetting the cleaning-roll with the cleaning-liquid.

A sticky-layer-cleaner for removing residues adhered to a sticky flat layer includes a receptacle for a cleaning-liquid and a cleaning-roll in contact with the sticky flat layer, wherein the cleaning-roll includes an elongated carpet fabric which is helically folded around the cleaning-roll and a pile of which includes yarn tufts in loop and/or cut configuration, and the cleaning-roll further includes a helical channel along the length of the folded carpet fabric for draining the cleaning-liquid from the cleaning-roll and/or for wetting the cleaning-roll with the cleaning-liquid.