| 摘要 |
A small profile strapping tool tensions a strap around a load, adheres the strap onto itself, and cuts a feed end of the strap. The tool includes 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 and a pneumatic tensioning motor for actuation during a tensioning cycle to tension the strap prior to adhering the strap onto itself. Operation of the strapper is controlled by a pneumatic module that is removably mounted to the cylinder housing. A compressed gas inlet provides gas to the module. A pilot valve is in flow communication with the gas inlet for controlling the flow of compressed gas into the module. A tensioning motor valve controls compressed gas flow to the tensioning motor to draw tension in the strap and a weld cycle valve controls compressed gas flow to the weld motor and piston. A timer and an accumulator are in parallel with the weld motor and are configured to isolate gas flow to the weld motor upon reaching a predetermined pressure in the accumulator following actuation. A tensioning motor valve switch actuates the tensioning motor valve and a weld motor valve switch actuates the weld motor valve. A pneumatic signal circuit disposed between the cylinder and a bleed valve includes a signal valve that controls actuation of the bleed valve to route gas to the tension motor to maintain tension in the strap following the weld cycle.
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