Inkjet printing system with co-linear airflow management
Inkjet printing systems are provided that use a cross-module airflow to limit condensation between a printing module and a receiver and that supply a co-linear flow of air that flows along with ink droplets toward a receiver. An integration area is created between the inkjet printhead heads, the receiver and a barrier to allow co-linear flow and cross-module flow to integrate and flow from between the printing module and the receiver without disrupting travel paths of the ink droplets.
1. An inkjet printing system comprising:
a receiver transport system having an actuator that moves a receiver along a direction of receiver movement to a first print line that is not parallel to the direction of receiver movement and then to a second print line, adjacent to the first print line, that is not parallel to the direction of receiver movement;
a printing module having at least one printhead at the first print line and at least one printhead at the second print line;
a plurality of caps with one cap about each of the printheads that extends from a barrier that is between the printheads toward the receiver to create a higher resistance flow area between the cap and the receiver and lower resistance flow channels around the caps;
a co-linear airflow system generating an airflow that travels with the inkjet droplets from openings in the caps toward the receiver;
a cross-module airflow system supplying a cross-module airflow between the barrier and the receiver;
an integration assembly having a frame that positions at least one interline support surface relative to the first print line and the second print line to urge the receiver away from the barrier as the receiver is moved from the first print line to the second print line to create an integration volume between the first print line, the second print line, the receiver and the barrier within which the co-linear air flow and the cross-module airflow can integrate to allow the co-linear airflow and the cross-module airflow to flow in combination into the lower resistance flow channels without creating flows into the higher resistance flow areas that cause an observable artifact in a print made using the printheads.
2. The system of claim 1 , further comprising a first support surface aligned with the first print line and a second support surface aligned with the second print line, wherein at least one of the first, second and interline support surfaces comprises a roller.
3. The system of claim 1 , further comprising a first support surface aligned with the first print line and a second support surface aligned with the second print line, wherein the frame positions the first support surface, the second support surface and the interline support surfaces relative to each other.
4. The system of claim 1 , wherein the receiver is urged against the support surfaces by a vacuum suction supplied by a vacuum system.
5. The system of claim 4 , further comprising a vacuum manifold having seals that are disposed about the at least one interline support surface, so that a generally sealed area is created between receiver, the at least one interline support surface, the seals and a vacuum system to create a vacuum in the manifold that attracts the receiver into contact with the at least one interline support surface.
6. The system of claim 1 , wherein the receiver is urged into contact with the at least one interline support surface by inducing first electrostatic charge on the receiver and by inducing a second, opposite, electrostatic charge on the interline support surfaces so as to create an electrostatic attraction.
7. The system of claim 1 , wherein the receiver is deflected against the support surfaces by inducing a running buckle in the receiver.
8. The system of claim 1 , wherein the receiver is moved so that the receiver is at a first separation distance from the barrier at the first print line, so that the receiver is at a second separation distance from the barrier at the second print line and so that the receiver is urged to a fax distance from the barrier that is greater than the first barrier distance and the second barrier distance as the receiver is moved between the first print line and the second print line.
9. The system of claim 8 , wherein the far distance is at least 30 percent greater than the first separation distance and the second separation distance.
10. The system of claim 8 , wherein the far distance is between 25 to 100 percent greater than the first separation distance and the second separation distance.
11. The system of claim 8 , wherein the far distance is between about 35 to 50 percent greater than the first separation distance and the second separation distance.
12. An inkjet printing system comprising:
a printing module that prints ink droplets along a first print line and along a second print line adjacent to the first print line,
a receiver transport having an actuator for moving the receiver from the first print line to the second print line;
a plurality of caps at the first print line and the second print line with openings at the first print line and the second print line through which the printing module can deliver ink droplets to the receiver;
a cross-module airflow generation means to generate a cross-module airflow between the receiver and the printing module to remove condensation between the printing module and the receiver;
a source of a co-linear airflow that flows along with ink droplets toward the receiver; and
an integration module that causes the receiver to move away from the printing module between the first print line and the second print line so that an integration area is created between the first print line, the second print line, the receiver and the printing module to allow co-linear flow and cross-module flow to integrate and flow from between the receiver and the printing module without disrupting travel paths of ink droplets.
13. An inkjet printing system comprising:
a receiver transport system having an actuator that moves a receiver along a direction of receiver movement to a first print line that is not parallel to the direction of receiver movement and then to a second print line, adjacent to the first print line, that is not parallel to the direction of receiver movement;
a printing module having at least three inkjet nozzle arrays to direct ink droplets onto the receiver and arranged with at least one of the at least three inkjet nozzle arrays along the first print line and with at least one of the at least three inkjet nozzle arrays along the second print line that, and a barrier between the inkjet nozzle arrays;
at least three caps with each cap positioned about one of the at least three inkjet nozzle arrays extending from the barrier to a first barrier distance from the barrier at the first print line to create higher resistance flow areas between the cap and the receiver and with each cap having an opening through which inkjet droplets can pass from one of the at least three inkjet nozzle arrays through the higher resistance flow area to the receiver;
a co-linear airflow system generating an airflow that travels with the inkjet droplets from the openings in the caps toward the receiver;
a cross-module airflow system having at supplying a cross-module airflow between the print module and the receiver;
an integration assembly having a frame that positions at least one interline support surface relative to the first print line and the second print line to urge the receiver away from the barrier as the receiver is moved to from the first print line to the second print line to create an integration volume between the first print line, the second print, the receiver and the barrier within which co-linear air flow and cross-module airflow can integrate to allow the co-linear airflow and the cross-module airflow to flow in combination into lower resistance flow channels provided in separations between the caps without creating flows into the higher resistance flow areas that cause an observable artifact in a print made using the printing module.