Patent ID: 7155885

Claim:
A strapping tool for tensioning a strap around a load, adhering the strap onto itself, and cutting a feed end of the strap, comprising: a body defining a cylinder housing; a piston disposed within a cylinder in the cylinder housing; a pneumatic weld motor operably connected to the piston for actuation during a weld cycle to adhere the strap onto itself; a pneumatic tensioning motor for actuation during a tensioning cycle to tension the strap prior to adhering the strap onto itself; and a pneumatic module removably mounted to the cylinder housing, the pneumatic module having a compressed gas inlet to the module, a pilot valve in flow communication with the gas inlet for controlling the flow of compressed gas into the module, a tensioning motor valve for controlling compressed gas flow to the tensioning motor, a weld cycle valve for controlling compressed gas flow to the weld motor, a timer and an accumulator in parallel with the weld motor and configured to isolate gas flow to the weld motor upon reaching a predetermined pressure in the accumulator, a tensioning motor valve switch for actuating the tensioning motor to draw tension in the strap, and a pneumatic signal circuit disposed between the cylinder and a bleed valve, the pneumatic signal circuit including a signal valve, wherein actuation of the tensioning motor valve switch actuates the tensioning motor to draw tension in the strap and subsequent actuation of the weld cycle valve initiates the weld cycle to adhere the strap onto itself, and wherein the signal valve controls movement of the bleed valve to route gas to the tensioning motor to maintain tension in the strap following the weld cycle and to release tension in the strap in a timed manner.