JETTING-MODULE CLEANING SYSTEM
A jetting-module cleaning system for cleaning the nozzle plate of a jetting module includes a non-rotating shaft and a rotating wiper mechanism. The non-rotating shaft includes one or more outlet openings extending from its hollow core to its outer surface. The rotating wiper mechanism includes a rotating sleeve having one or more openings extending from its hollow core to its outer surface, and one or more wiper blades. The rotating wiper mechanism rotates around the non-rotating shaft. A pressurized fluid source supplies pressurized cleaning fluid to the hollow core of the non-rotating shaft. An actuator rotates the rotating wiper mechanism around its axis. Cleaning fluid is sprayed onto the nozzle plate through the one or more outlet openings in the non-rotating shaft when the openings in the rotating sleeve are aligned with the outlet openings in the non-rotating shaft.
1 . A jetting-module cleaning system for cleaning ink deposits from a nozzle plate of a jetting module of an inkjet printing system, the nozzle plate including an array of nozzles through which ink is ejected, the array of nozzles extending a length in a length direction, comprising:
a mounting system for mounting the jetting module in the jetting-module cleaning system;
a non-rotating shaft with a shaft axis having a hollow core and an outer surface, the non-rotating shaft being mounted with the shaft axis being parallel to the length direction of the nozzle array of a mounted jetting module, the non-rotating shaft having a length which is at least as long as the length of the nozzle array, wherein the non-rotating shaft includes one or more outlet openings extending from the hollow core to the outer surface, the one or more outlet openings facing the nozzle plate of a mounted jetting module;
a rotating wiper mechanism including:
a rotating sleeve which rotates around a sleeve axis, the rotating sleeve having a hollow core and an outer surface, the non-rotating shaft being mounted within the rotating sleeve such that the rotating wiper mechanism rotates around the non-rotating shaft, wherein the rotating sleeve includes one or more openings extending from the hollow core to the outer surface, the openings being located at an angular position relative to the sleeve axis; and
one or more wiper blades affixed to the outer surface of the rotating sleeve at corresponding angular positions, the wiper blades extending the length of the nozzle array, wherein when the rotating sleeve is rotated the wiper blades wipe across the nozzle plate of the mounted jetting module;
a pressurized fluid source for supplying pressurized cleaning fluid through tubing to the hollow core of the non-rotating shaft; and
an actuator for rotating the rotating wiper mechanism around the sleeve axis;
wherein the cleaning fluid is sprayed onto the nozzle plate through the one or more outlet openings in the non-rotating shaft when the rotating wiper mechanism is rotated to an angular orientation where the one or more openings in the rotating sleeve are aligned with the one or more outlet openings in the non-rotating shaft.
2 . The jetting-module cleaning system of claim 1 , wherein the one or more wiper blades include a leading wiper blade affixed to the hollow rotating sleeve at an angular position preceding the angular position of the one or more openings in the hollow rotating sleeve and a trailing wiper blade affixed to the hollow rotating sleeve at an angular position following the angular position of the one or more openings in the hollow rotating sleeve.
3 . The jetting-module cleaning system of claim 2 , wherein the leading wiper blade is shorter or thinner than the trailing wiper blade.
4 . The jetting-module cleaning system of claim 2 , wherein the leading wiper blade is made of a material having a lower durometer than the trailing wiper blade.
5 . The jetting-module cleaning system of claim 1 , wherein the one or more wiper blades are elastomeric.
6 . The jetting-module cleaning system of claim 1 , wherein the one or more outlet openings in the non-rotating shaft include a plurality of nozzles distributed along the length of the non-rotating shaft.
7 . The jetting-module cleaning system of claim 1 , wherein the one or more outlet openings in the non-rotating shaft include a slot extending in the length direction.
8 . The jetting-module cleaning system of claim 1 , wherein the one or more openings in the rotating sleeve include a slot extending over at least the length of the nozzle array.
9 . The jetting-module cleaning system of claim 1 , wherein the one or more openings in the rotating sleeve include a plurality of openings at positions corresponding to positions of the one or more outlet openings in the non-rotating shaft.
10 . The jetting-module cleaning system of claim 1 , wherein the mounting system includes alignment features which engage with corresponding alignment features on the jetting module.
11 . The jetting-module cleaning system of claim 1 , wherein the pressurized fluid source includes a pump.
12 . The jetting-module cleaning system of claim 11 , wherein the pump is a peristaltic pump.
13 . The jetting-module cleaning system of claim 11 , wherein the actuator that rotates the rotating wiper mechanism is a motor, and wherein the motor also drives the pump.
14 . The jetting-module cleaning system of claim 11 , further including a valve adapted to control the flow of the cleaning fluid through the tubing between the pump and the hollow core of the non-rotating shaft.
15 . The jetting-module cleaning system of claim 14 , wherein the valve is controlled to block the flow of the cleaning fluid when the one or more openings in the rotating sleeve are not aligned with the one or more outlet openings in the non-rotating shaft.
16 . The jetting-module cleaning system of claim 15 , further including a sensor for sensing a rotational position of the rotating wiper mechanism, wherein the valve is controlled responsive to the sensed rotational position of the rotating wiper mechanism.
17 . The jetting-module cleaning system of claim 15 , wherein the tubing between the pump and the valve is made of a compliant material such that the tubing between the pump and the valve expands when the flow of the cleaning fluid is blocked.
18 . The jetting-module cleaning system of claim 1 , further including a sump that encloses the rotating wiper mechanism, the sump being adapted to collect the cleaning fluid that is sprayed onto the nozzle plate.
19 . The jetting-module cleaning system of claim 18 , wherein the one or more wiper blades pass through the cleaning fluid collected in the sump as the rotating wiper mechanism rotates.
20 . The jetting-module cleaning system of claim 1 , wherein the jetting-module cleaning system is positioned in proximity to an inkjet printing system such that the jetting module can be moved from a printing position in the inkjet printing system to be mounted in the jetting-module cleaning system without disconnecting associated fluid lines or electrical connection from the jetting module.
21 . The jetting-module cleaning system of claim 20 , wherein the jetting-module cleaning system is removably attached to the inkjet printing system.
22 . The jetting-module cleaning system of claim 1 , wherein the array of nozzles is a linear nozzle array.
23 . The jetting-module cleaning system of claim 1 , wherein the rotating sleeve further includes a second set of one or more openings extending from the hollow core to the outer surface, the second set of one or more openings being located at a second angular position relative to the sleeve axis.
24 . The jetting-module cleaning system of claim 1 , wherein the jetting module is controlled to eject a liquid from the nozzles while it is being cleaned in the jetting-module cleaning system.