
Franklin's printing business was thriving in this 1730s and 1740s. He also started setting up franchise printing partnerships in other cities. By 1749 he retired from business and started concentrating on science, experiments, and inventions. This was nothing new to Franklin. In 1743, he had already invented a heat-efficient stove — called the Franklin stove — to help warm houses efficiently. As the stove was invented to help improve society, he refused to take out a patent. Among Franklin's other inventions are swim fins, the glass armonica (a musical instrument) and bifocals.
But Franklin thrived on work. In 1733 he started publishing Poor Richard's Almanack. Almanacs of the era were printed annually, and contained things like weather reports, recipes, predictions and homilies. Franklin published his almanac under the guise of a man named Richard Saunders, a poor man who needed money to take care of his carping wife. What distinguished Franklin's almanac were his witty aphorisms and lively writing. Many of the famous phrases associated with Franklin, such as, "A penny saved is a penny earned" come from Poor Richard.
In 1729, Benjamin Franklin bought a newspaper, the Pennsylvania Gazette. Franklin not only printed the paper, but often contributed pieces to the paper under aliases. His newspaper soon became the most successful in the colonies. This newspaper, among other firsts, would print the first political cartoon, authored by Ben himself.
During the 1720s and 1730s, the side of Franklin devoted to public good started to show itself. He organized the Junto, a young working-man's group dedicated to self- and-civic improvement. He joined the Masons. He was a very busy man socially.
source:
http://www.ushistory.org/franklin/info/index.htm