Elastomeric driver return assembly for an electro-mechanical fastener driving tool

In combination, a driver return assembly and an electromechanical fastener driving tool of the type having a driver, an electrically driven flywheel, together with a support element to engage said driver and move said driver through a working stroke, and at least one elastomeric cord affixed at one end to said driver and at the other end to a first anchoring means within said tool to return said driver to a normal retracted position after the working stroke, said driver return assembly comprising said at least one elastomeric cord and at least two rotatable pulleys over which said elastomeric cord passes, one of said pulleys being mounted on a fixed position shaft near that end of said driver to which said cord is affixed when said driver is in said normal retracted position, the other of said pulleys being mounted on a floating shaft spaced from said fixed position shaft, a second anchoring means within said tool, at least one tension spring, said floating shaft being connected to said second anchoring means by said at least one tension spring such that said pulley on said floating shaft applies tension to said elastomeric cord automatically, compensating for permanent stretch therein and assuring that said driver returns to its normal retracted position.