Post-application ink processing and sheet handling
An apparatus including a control cylinder rotatably supported for thermal conduction to a sheet. The sheet conveys ink deposited on a first side. The sheet is held against a peripheral arch of the control cylinder as it rotates with the first side of the sheet directly engaging and wrapping around the control cylinder along the peripheral arch. The apparatus also includes a thermal control element for heating and/or cooling the control cylinder. The apparatus also includes a pressure roll for spreading the ink. The pressure roll with the control cylinder forms a spreader nip, which is selectively changeable between a closed and open position. In the closed position the pressure roll is biased toward the control cylinder for applying pressure to the ink on the sheet. The pressure roll is spaced further away from the control cylinder in the open position relative to the closed position.
1. A system for processing ink applied to substrate media sheets, the system comprising:
a media cart including a platen for supporting thereon at least one substrate media sheet, the media cart being translatable along a process path to transport the sheet to a control cylinder;
the control cylinder rotatably supported for thermal conduction to a sheet of substrate media, the sheet conveying ink deposited on a first side thereof, the sheet being held against an arched portion of the control cylinder as the control cylinder rotates with the first side of the sheet directly engaging and wrapping around the control cylinder along the arched portion, wherein the control cylinder includes a sheet acquiring apparatus which acquires the sheet from the media cart when the media cart is in a first position;
a thermal control element for at least one of heating and cooling the control cylinder;
a pressure roll for spreading the ink, the pressure roll together with the control cylinder forming a spreader nip, the spreader nip selectively changeable between a closed position and an open position, in the closed position the pressure roll being biased toward the control cylinder for applying pressure to the ink on the sheet, the pressure roll spaced further away from the control cylinder in the open position relative to the closed position;
an over run tray for receiving the sheet after disengaging from the control cylinder; and,
an exit path extending from the over run tray generally toward the process path, the exit path guiding the sheet to the media cart with the media cart being in a second position spaced from the first position.
2. The system as defined in claim 1 , wherein the sheet acquiring apparatus utilizes one or more of grippers, vacuum suction, air pressure and electrostatic force to acquire the sheet from the media cart when the media cart is in the first position.
3. The system as defined in claim 1 , further including a track with the media cart translating on the track along the process path between the first and second positions.
4. The system of claim 1 , further including a sensor for detecting a temperature of at least one of the sheet and the ink deposited thereon and the thermal control element adjusts the temperature of the control cylinder in response to the temperature detected by the sensor.
5. The system of claim 1 , wherein the control cylinder at least partially levels the ink while the sheet is held against the arched portion.
6. The system of claim 1 , wherein a rotational velocity of the control cylinder is adjustable for regulating a dwell time in which the sheet remains in direct engagement with the control cylinder.
7. The system of claim 6 , further comprising a sensor for detecting a temperature of at least one of the sheet and the ink deposited thereon.
8. The system of claim 7 , wherein the dwell time is regulated by controlling the velocity of the control cylinder such to allow the sheet to be held against the control cylinder long enough for the sensor to detect a temperature of at least one of the sheet and the ink deposited thereon.
9. The system of claim 8 , wherein the thermal control element adjusts the temperature of the control cylinder in response to the temperature detected by the sensor.
10. The system of claim 7 , wherein the thermal control element adjusts the temperature of the control cylinder in response to the temperature detected by the sensor.
11. The system of claim 1 , wherein the thermal control element includes for heating the control cylinder one or more electrical resistance coils or tubing permitting a heated fluid to flow and a heated fluid.
12. The system of claim 1 , wherein the thermal control element includes tubing for cooling the control cylinder, the tubing permitting a cooling fluid to flow.
13. The system of claim 1 , further comprising a sensor for detecting a temperature of at least one of the sheet and the ink deposited thereon.
14. The system of claim 13 , wherein the thermal control element adjusts the temperature of the control cylinder in response to the temperature detected by the sensor.
15. The system of claim 1 , further comprising at least one controller operatively connected to and controlling the control cylinder, the thermal control element and the pressure roll.
16. The system of claim 1 , wherein the pressure roll is associated with an actuator and movement of the actuator selectively applies and releases pressure of the pressure roll, the actuator being in a form of a pneumatic or a hydraulic linear actuator.