Printing press
A printing press is a mechanical device for applying pressure to an inked surface resting upon a print medium, thereby transferring the ink. It marked a dramatic improvement on earlier printing methods in which the cloth, paper, or other medium was brushed or rubbed repeatedly to achieve the transfer of ink and accelerated the process. Typically used for texts, the invention and global spread of the printing press was one of the most influential events in the second millennium.
In Germany, around 1440, the goldsmith Johannes Gutenberg invented the movable-type printing press, which started the Printing Revolution. Modelled on the design of existing screw presses, a single Renaissance movable-type printing press could produce up to 3,600 pages per workday, compared to forty by hand-printing and a few by hand-copying. Gutenberg's newly devised hand mould made possible the precise and rapid creation of metal movable type in large quantities. His two inventions, the hand mould and the movable-type printing press, together drastically reduced the cost of printing books and other documents in Europe, particularly for shorter print runs.
From Mainz, the movable-type printing press spread within several decades to over 200 cities in a dozen European countries. By 1500, printing presses in operation throughout Western Europe had already produced more than 20 million volumes. In the 16th century, with presses spreading further afield, their output rose tenfold to an estimated 150 to 200 million copies. The earliest press in the Western Hemisphere was established by Spaniards in New Spain in 1539, and by the mid-17th century, the first printing presses arrived in British colonial America in response to the increasing demand for Bibles and other religious literature. The operation of a press became synonymous with the enterprise of printing and lent its name to a new medium of expression and communication, "the press".
The spread of mechanical movable type printing in Europe in the Renaissance introduced the era of mass communication, which permanently altered the structure of society. The relatively unrestricted circulation of information and ideas transcended borders, captured the masses in the Reformation, and threatened the power of political and religious authorities. The sharp increase in literacy broke the monopoly of the literate elite on education and learning and bolstered the emerging middle class. Across Europe, the increasing cultural self-awareness of its peoples led to the rise of proto-nationalism and accelerated the development of European vernaculars, to the detriment of Latin's status as lingua franca. In the 19th century, the replacement of the hand-operated Gutenberg-style press by steam-powered rotary presses allowed printing on an industrial scale.
History
Economic conditions and intellectual climate
The rapid economic and socio-cultural development of late medieval society in Europe created favorable intellectual and technological conditions for Gutenberg's improved version of the printing press: the entrepreneurial spirit of emerging capitalism increasingly made its impact on medieval modes of production, fostering economic thinking and improving the efficiency of traditional work processes. The sharp rise of medieval learning and literacy amongst the middle class led to an increased demand for books which the time-consuming hand-copying method fell far short of accommodating.Technological factors
Technologies preceding the press that led to the press's invention included: manufacturing of paper, development of ink, woodblock printing, and invention of eyeglasses. At the same time, a number of medieval products and technological processes had reached a level of maturity which allowed their potential use for printing purposes. Gutenberg took up these far-flung strands, combined them into one complete and functioning system, and perfected the printing process through all its stages by adding a number of inventions and innovations of his own:File:Holzspindelkelter von 1702.jpg|thumb|left|Early modern wine press. Such screw presses, used in Europe for a wide range of uses, provided Gutenberg with the model for his printing press.
The screw press which allowed direct pressure to be applied on a flat plane was already of great antiquity in Gutenberg's time and was used for a wide range of tasks. Introduced in the 1st century AD by the Romans, it was commonly employed in agricultural production for pressing grapes for wine and olives for oil, both of which formed an integral part of the Mediterranean and medieval diet. The device was also used from very early on in urban contexts as a cloth press for printing patterns. Gutenberg may have also been inspired by the paper presses which had spread through the German lands since the late 14th century and which worked on the same mechanical principles.
During the Islamic Golden Age, Arab Muslims were printing texts, including passages from the Qur’an, embracing the Chinese craft of paper making, developed it and adopted it widely in the Muslim world, which led to a major increase in the production of manuscript texts. In Egypt during the Fatimid era, the printing technique was adopted reproducing texts on paper strips by hand and supplying them in various copies to meet the demand.
Gutenberg adopted the basic design, thereby mechanizing the printing process. Printing, however, put a demand on the machine quite different from pressing. Gutenberg adapted the construction so that the pressing power exerted by the platen on the paper was now applied both evenly and with the required sudden elasticity. To speed up the printing process, he introduced a movable undertable with a plane surface on which the sheets could be swiftly changed.
File:metal movable type.jpg|thumb|Movable type sorted in a letter case and loaded in a composing stick on top
The concept of movable type existed prior to 15th century Europe; sporadic evidence that the typographical principle, the idea of creating a text by reusing individual characters, was known and had been cropping up since the 12th century and possibly before.
The first movable type was invented by Chinese engineer Bi Sheng in the 11th century during the Song dynasty, and a book dating to 1193 recorded the first copper movable type.
This received limited use compared to woodblock printing. The technology spread outside China, as the oldest printed book using metal movable type was the Jikji, printed in Korea in 1377 during the Goryeo era. Other notable examples include the Prüfening inscription from Germany, letter tiles from England and Altarpiece of Pellegrino II in Italy. However, the various techniques employed did not have the refinement and efficiency needed to become widely accepted. Tsuen-Hsuin and Needham, and Briggs and Burke suggest that the movable-type printing in China and Korea was rarely employed.
Gutenberg greatly improved the process by treating typesetting and printing as two separate work steps. A goldsmith by profession, he created his type pieces from a lead-based alloy which suited printing purposes so well that it is still used today. The mass production of metal letters was achieved by his key invention of a special hand mould, the matrix. The Latin alphabet proved to be an enormous advantage in the process because, in contrast to logographic writing systems, it allowed the type-setter to represent any text with a theoretical minimum of only around two dozen different letters.
Another factor conducive to printing arose from the book existing in the format of the codex, which had originated in the Roman period. Considered the most important advance in the history of the book prior to printing itself, the codex had completely replaced the ancient scroll at the onset of the Middle Ages. The codex holds considerable practical advantages over the scroll format: it is more convenient to read, more compact, and less costly, and both recto and verso sides could be used for writing or printing, unlike the scroll.
File:Gutenberg Bible, Lenox Copy, New York Public Library, 2009. Pic 01.jpg|thumb|upright=0.9|A paper codex of the 42-line Bible, Gutenberg's major work
A fourth development was the early success of medieval papermakers at mechanizing paper manufacture. The introduction of water-powered paper mills, the first certain evidence of which dates to 1282, allowed for a massive expansion of production and replaced the laborious handcraft characteristic of both Chinese and Muslim papermaking. Papermaking centres began to multiply in the late 13th century in Italy, reducing the price of paper to one-sixth of parchment and then falling further. Papermaking centers reached Germany a century later.
Despite this it appears that the final breakthrough of paper depended just as much on the rapid spread of movable-type printing. Codices of parchment, which in terms of quality is superior to any other writing material, still had a substantial share in Gutenberg's edition of the 42-line Bible. After much experimentation, Gutenberg managed to overcome the difficulties which traditional water-based inks caused by soaking the paper, and found the formula for an oil-based ink suitable for high-quality printing with metal type.
Function and approach
A printing press, in its classical form, is a standing mechanism, ranging from long, wide, and tall. The small individual metal letters known as type would be set up by a compositor into the desired lines of text. Several lines of text would be arranged at once and were placed in a wooden frame known as a galley. Once the correct number of pages were composed, the galleys would be laid face up in a frame, also known as a forme, which itself is placed onto a flat stone, 'bed,' or 'coffin.'The text is inked using two balls, pads mounted on handles. The balls were made of dog skin leather, because it has no pores, and stuffed with sheep's wool and were inked. This ink was then applied to the text evenly. One damp piece of paper was then taken from a heap of paper and placed on the tympan. The paper was damp as this lets the type 'bite' into the paper better. Small pins hold the paper in place. The paper is now held between a frisket and tympan.
These are folded down, so that the paper lies on the surface of the inked type. The bed is rolled under the platen, using a windlass mechanism. A small rotating handle called the 'rounce' is used to do this, and the impression is made with a screw that transmits pressure through the platen. To turn the screw the long handle attached to it is turned. This is known as the bar or 'Devil's Tail.' In a well-set-up press, the springiness of the paper, frisket, and tympan caused the bar to spring back and raise the platen, the windlass turned again to move the bed back to its original position, the tympan and frisket raised and opened, and the printed sheet removed. Such presses were always worked by hand. After around 1800, iron presses were developed, some of which could be operated by steam power.
The function of the printing press was described by William Skeen in 1872: