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If by "Xerox machine" you mean a copier or printer marketed by the Xerox Corporation, the only rays emitted are rays of light emitted by parts of some copiers.
Xerox is a company best known for its photocopying technology. As a verb, it is often used informally to mean making a photocopy of a document, but technically it refers to the act of copying using a Xerox machine.
The word Xerox is short for the Xerox Corporation and is also a trademark for that corporation. As an adjective it can also be used to reference a particular product marketed by Xerox Corporation or its affiliate, Fuji Xerox Corporation. The word is used incorrectly by some as a verb to mean "make a copy," but as a trademark the word is a proper noun and not a verb.
The term "Xerox copy" is often incorrectly used to mean the same thing as "photocopy." But "Xerox" is a proper noun and a trademark for the Xerox Corporation so "Xerox copy" actually means a copy made on a copier that carries the Xerox brand. The word "photocopy" means any copy that has been made using a photographic process and includes copies made on Xerox machines, and other copiers.
Xerox does not mean photo copy, although some people use it as if it did mean that. "Xerox is a short form of the name of the company, Xerox Corporation, and a registered trademark owned by that company. Photocopy is a noun and means a copy of an original made through the use of a photographic process. The word photocopy can also be a verb meaning to make such a copy. Xerox Corporation is widely known as the company that introduced the first highly successful machines that made photocopies using dry ink and plain paper.
In the strictest sense, a Xerox machine is a machine that is manufactured or sold by the Xerox Corporation or one of its affiliates, such as Fuji Xerox. The word "Xerox" is a registered trade mark and in that sense can only be used in connection with products of the Xerox Corporation. In common usage, the term "Xerox machine" is used by many to mean any machine that makes a photocopy using the xerographic process that involves dry ink, electrostatic charges, a light-sensitive photoreceptor surface, and heat or pressure fusing of the dry ink to the paper. The photocopy manufacturing industry tries to minimize this use, however, for two reasons. Xerox Corporation wants to maintain control of its trade mark and prevent it going the way of the term "hoover" in the UK or "aspirin" in the US. Most of its competitors would prefer that their products not be associated in the public language with the name of a competing manufacturer.
Neither the word "Xerox" nor the Xerox Corporation existed in medieval times. Xerox is a trademark and an invented word - invented around 1958. Xerxes, however, was an ancient Persian emperor, long before medieval times, but his name was known in medieval Europe.
The phrase "you are about to delivered of a baby xerox machine" is someone's cute way of announcing that a photocopy machine will be delivered soon.
When Xerox originated depends on what you mean by "Xerox." The company that is now called Xerox Corporation was formed as the Haloid Company in 1906. It changed its name to Xerox Corporation around 1958. The process of xerography, the making of a photocopy with dry ink, was first demonstrated in 1938. The first machine using xerography was marketed about 1954 and the first fully automated xerographic copy machine was released in 1959. Any one of these dates could be "when Xerox originated" to some people.
Xerox is a registered trade mark and brand name of the Xerox Corporation. The variation "xeroxes" is an incorrect usage that some apply when they mean to refer to more than one photocopy. The correct plural of photocopy is "copies" or "photocopies." "Xeroxes" is not a valid word.
I excel. (or International Xerox Lovers for short)
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