Patent ID: 6932162

Claim:
Processing machine, comprising: a pneumatic motor, a pneumatic circuit for connecting the motor to a source of compressed air, the pneumatic circuit comprising a motor supply valve, a tool holder spindle, a drive mechanism which mechanically connects the motor to the spindle in order to drive the spindle, the drive mechanism comprising a selection element which can be moved between a first selection position for selecting a first method of driving the spindle and a second selection position for selecting a second method of driving the spindle which is different from the first driving method, and a device for controlling the operation of the machine in order to control the carrying-out of a driving cycle which comprises at least one phase for driving the spindle according to the first driving method, then a phase for driving the spindle according to the second driving method, then to control the stopping of the supply of air to the motor, wherein, the supply valve is controlled mechanically by the selection element to interrupt the supply of compressed air to the motor at the end of the driving cycle, and the supply valve comprises a shutter which is mechanically movable by the selection element between a first open position, which the shutter takes up when the selection element is in the first selection position, and a second open position, which the shutter takes up when the selection element is in the second selection position.