A roller arrangement for printing apparatus comprises a first roller. The first roller comprises a plurality of cells. Each of the plurality of cells receives an amount of a coating material. The roller arrangement further comprises an extractor to remove at least a portion of the coating material from a selected set of the plurality of the cells.

A fluid distribution device, for applying a fluid onto a transfer roller (2), comprises an elongated chamber (10), at least one inlet (31) for letting a fluid into the chamber (10), a longitudinal opening extending in the axial direction and adapted to face a transfer roller (2) so as to allow fluid to exit the chamber and contact the transfer roller, and at least one wiper blade (11) extending along at least a portion of the longitudinal opening. The chamber comprises, at each of the two axial ends of the chamber, a wall (15) separating the chamber (10) from a cavity (16), wherein the wall (15) has a wall surface (15A) arranged to face the transfer roller (2) when the device is in use, the wall (15) being dimensioned so that the wall surface (15A) will be distanced from the transfer roller when the device is in use, so as to allow fluid to be present in a gap (20) between the wall surface (15A) and the transfer roller.

A roller arrangement for printing apparatus comprises a first roller. The first roller comprises a plurality of cells. Each of the plurality of cells receives an amount of a coating material. The roller arrangement further comprises an extractor to remove at least a portion of the coating material from a selected set of the plurality of the cells.

A roller arrangement for printing apparatus comprises a first roller. The first roller comprises a plurality of cells. Each of the plurality of cells receives an amount of a coating material. The roller arrangement further comprises an extractor to remove at least a portion of the coating material from a selected set of the plurality of the cells.

A system and method for supplying ink can include an ink supply device with a first end and a second end located along an axis on opposite sides of the ink supply device. In an example, the first end is frustum shaped, and the second end is frustum shaped. In an example, a first ink connector can be attached to the first end. In an example, a second ink connector can be attached to the second end. In an example, a pump can be connected to the second ink connector to move ink accumulating in the second end through the second ink connector into the ink supply system.

A system and method for supplying ink can include an ink supply device with a first end and a second end located along an axis on opposite sides of the ink supply device. In an example, the first end is frustum shaped, and the second end is frustum shaped. In an example, a first ink connector can be attached to the first end. In an example, a second ink connector can be attached to the second end. In an example, a pump can be connected to the second ink connector to move ink accumulating in the second end through the second ink connector into the ink supply system.

A fluid distribution device, for applying a fluid onto a transfer roller, comprises includes an elongated chamber, at least one inlet for letting a fluid into the chamber, a longitudinal opening extending in the axial direction and adapted to face a transfer roller to allow fluid to exit the chamber and contact the transfer roller, and at least one wiper blade extending along at least a portion of the longitudinal opening. The chamber includes, at each of the two axial ends of the chamber, a wall separating the chamber from a cavity. The wall has a wall surface arranged to face the transfer roller when the device is in use. The wall is dimensioned so that the wall surface will be distanced from the transfer roller when the device is in use, so as to allow fluid to be present in a gap between the wall surface and the transfer roller.

An ink supply system (10) comprises an ink chamber (12); an ink line (14) with a Venturi nozzle (16), wherein the ink chamber (12) has an inlet (18), which is connected to the ink line (14) upstream of the Venturi nozzle (16), and an outlet (24), which is connected to the suction side of the Venturi nozzle (16); an ink reservoir (30) from which the ink is transferred by a pump (28) to the inlet (18) and into the ink line (32); and an ink return line (32), which connects the downstream end of the Venturi nozzle (16) with the ink reservoir (30).

A fluid distribution device, for applying a fluid onto a transfer roller, includes an elongated chamber, at least one inlet for letting a fluid into the chamber, a longitudinal opening extending in the axial direction and adapted to face a transfer roller to allow fluid to exit the chamber and contact the transfer roller, and at least one wiper blade extending along at least a portion of the longitudinal opening. The chamber includes, at each of the two axial ends of the chamber, a wall separating the chamber from a cavity. The wall has a wall surface arranged to face the transfer roller when the device is in use. The wall is dimensioned so that the wall surface will be distanced from the transfer roller when the device is in use, so as to allow fluid to be present in a gap between the wall surface and the transfer roller.