Inkjet Fax Machines

What inkjet fax machines are

Inkjet fax machines are a class of plain-paper fax machines that reproduce received pages -- and, in copier-equipped units, copied pages -- using an inkjet printing engine rather than printing onto the heat-sensitive roll paper used by earlier direct-thermal fax machines. They belong to the broader shift toward plain-paper fax: encyclopedic reference notes that fax machines from the 1970s to the 1990s often used direct-thermal printers, but that since the mid-1990s the technology moved toward plain-paper output produced by thermal-transfer, inkjet, and laser printers. As a class, inkjet fax machines are best described at the family level; individual models varied, and this page does not assign specifications to specific units.

Group 3: the standard behind the machine

The way a fax machine prints is independent of the standard it uses to send and receive. Like almost all consumer and office fax machines, inkjet fax machines are Group 3 devices, defined by ITU-T Recommendation T.4 (image coding and terminal characteristics for Group 3) and Recommendation T.30 (the transmission procedures used over the public switched telephone network). Under Group 3, a page is scanned and transmitted at a standard resolution of about 204 x 98 dots per inch or a fine resolution of about 204 x 196 dots per inch, per ITU-T T.4. The image data is carried by voiceband modems: standard Group 3 uses ITU-T V.27ter, V.29, and V.17, reaching up to 14.4 kbit/s, while Super G3 machines add ITU-T V.34 for rates up to 33.6 kbit/s. An inkjet fax follows these same procedures; only the final step -- putting the decoded image on paper -- uses an inkjet engine.

Plain paper instead of thermal roll paper

The defining characteristic of the class is plain-paper output. A direct-thermal fax darkens special heat-sensitive paper, which is inexpensive but can fade, discolor, or curl over time, particularly when exposed to heat or light. An inkjet fax instead prints onto ordinary cut-sheet paper, so received documents are more durable and handle like normal office pages. Encyclopedic reference describes this move from thermal to plain paper -- via thermal-transfer, inkjet, and laser printing -- as the principal change in fax output since the mid-1990s. Inkjet was one of several plain-paper approaches, sitting between low-cost thermal machines and higher-volume laser fax machines.

How the inkjet printing works

Inkjet fax machines form the page with a drop-on-demand inkjet printhead, the same general mechanism used by inkjet printers: tiny nozzles eject controlled droplets of liquid ink onto the paper, with the droplets generated either by rapid heating (thermal inkjet) or by a flexing piezoelectric element. Because inkjet technology can print color affordably, some inkjet-based fax machines advertised color fax capability -- an option not practical on monochrome thermal units. The received-image detail is still bounded by the Group 3 scan resolution rather than by the printhead; the inkjet engine may address the paper at a higher native resolution than the transmitted fax actually contains.

Multifunction and all-in-one context

Many inkjet fax machines were not standalone fax units but part of all-in-one devices that combined printing, faxing, and copying -- and later scanning -- in a single chassis for home and small-office use. In these machines the fax function shared the inkjet print engine, paper path, and often a scanning mechanism with the printer and copier. A documented example is Hewlett-Packard's OfficeJet line, introduced in 1994, which HP's corporate history describes as its first all-in-one printer-fax-copier for home offices. Other manufacturers offered comparable inkjet all-in-ones; this page describes the category at the family level and does not attach specifications to individual models.

Where inkjet fax fits, and its decline

Within fax machines, inkjet output competed with older direct-thermal machines and with laser fax machines aimed at higher-volume offices. Inkjet offered durable plain-paper output and affordable color, generally at a lower purchase cost than laser, at the expense of ink consumption and print speed under heavy use. Like fax technology as a whole, dedicated inkjet fax machines became far less common as email, document scanning, and internet-based faxing displaced everyday paper faxing, and the standalone fax category contracted accordingly.

Reference scope and sourcing

This is a class page: it describes inkjet fax machines as a family rather than cataloguing individual units. Class-level facts about the fax standard, scan resolutions, and modulation rates are sourced to the relevant ITU-T Recommendations (T.4, T.30, V.17, and V.34), and the plain-paper transition and color-fax note are drawn from encyclopedic reference. Specifications that would vary by model -- such as exact print resolution, print speed, memory, and price -- are omitted rather than estimated, and no current pricing or availability is quoted.