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 low-pressure pneumatic system with feedback control of the air pressure.

The air circuit includes the Ink Cartridges, flexible air tubing, manifold connectors for the tubing, a DC motor driven air pump, a 2-way solenoid valve, and an analogue pressure sensor. Connection is made to each Ink Cartridge respectively by the same needle / septum system used for the ink; there is also a “quick connect” between the tubing and manifold that remains attached to the Tubes System and the APS Module.

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 de-pressurize the air circuit. This air pressure thereby controls the ink pressure at the inlet to the printheads. The system pressure for printing is set to ensure the defined Printhead inlet pressure for the highest possible flow rate.

Ink Level Sense (ILS)

The Printer includes a subsystem to monitor the amount of ink left in an off-axis ink supply, called Ink Level Sensing (ILS). The ink supplies used in the Printer consist of a collapsible ink bag inside a pressure shell. Two coils are attached to the external side of the bag and aligned with each other so that they form a variable transformer. The coupling coefficient of the transformer is a function of the distance between both coils, that is, it depends on the amount of

HP DesignJets 1050C and 1055CM Printers Service Manual

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HP 1055CM manual Air Pressurization System APS, Ink Level Sense ILS
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1055CM specifications

The HP 1055CM is a large-format printer that stands out in the world of professional printing due to its exceptional capabilities and advanced technologies. Launched as part of HP's Designjet series, the 1055CM is designed to meet the needs of architects, designers, and engineers who demand high-quality output in a variety of applications.

One of the main features of the HP 1055CM is its impressive printing speed. The printer can produce high-quality prints at resolutions up to 1200 dpi, ensuring sharp and vibrant details in every project. This makes it particularly suitable for printing technical drawings, schematics, and high-fidelity graphics. Its ability to work with a range of media types, including bond paper, coated paper, and glossy media, further enhances its versatility in a professional setting.

The HP 1055CM employs a 5-color ink system, which includes cyan, magenta, yellow, black, and light cyan. This configuration allows for a wide color gamut and the production of rich and vibrant colors, making it ideal for color-intensive tasks like marketing materials or presentations. The use of dye and pigment-based inks ensures that prints are not only vibrant but also durable, providing resistance to fading over time.

An important technological advancement in the HP 1055CM is its Print Designjet series technology, which facilitates rapid print processing. The printer's powerful processing capabilities allow it to handle complex files with ease, ensuring that users can produce high-quality output without long wait times. Additionally, the inclusion of a high-capacity media roll means that the printer can handle large jobs without frequent media changes, reducing interruptions in workflow.

Another characteristic of the HP 1055CM is its ease of use. The printer features a user-friendly interface with intuitive controls, allowing users to quickly access various functions and settings. Connectivity options, including USB and Ethernet interfaces, make it easy to integrate the printer into any existing network infrastructure, enabling multiple users to access its capabilities seamlessly.

In summary, the HP 1055CM is a robust and reliable printing solution that combines speed, versatility, and high-quality output. Its cutting-edge technologies and user-friendly design make it an invaluable asset for professionals who require precision and excellence in their large-format printing tasks. Whether for architectural plans or vibrant marketing materials, the HP 1055CM consistently delivers outstanding results.
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