Functional Overview
Air Pressurization System (APS)The APS is the system that provides and controls the pressurization of the ink in the Ink Cartridges. The key “mission” of this system is to ensure the minimum required ink pressure at the inlet to each Printhead respectively at the required print rates. Note that only a minimum pressure needs to be controlled since the purpose of this pressure is simply to refill the Printhead fast enough to maintain the Printhead’s internal pressure within its limits needed for drop- weight control. The APS is also used to provide pressure for tube purge and as part of the blow prime system operation.
The mechanism used is a
The air circuit includes the Ink Cartridges, flexible air tubing, manifold connectors for the tubing, a DC motor driven air pump, a
The APS module is a service replaceable module that houses the pump, valve and sensor in one chassis which also doubles as an ink catcher: this assembly clips under the ISS Housing.
The APS pressurizes the ink in the cartridge bags by pressurizing the air around them. The printer controls the pressure of this air using the pump with feedback from the sensor; when required the valve is opened to
The Printer includes a subsystem to monitor the amount of ink left in an
HP DesignJets 1050C and 1055CM Printers Service Manual |