Working process monitoring device
A working process monitoring device includes: a sensor unit for detecting at least one of vibrations and sound waves produced while processing a workpiece by a working machine rotatably driven by a driving unit; a signal input unit for extracting target signals from an electric signal outputted from the sensor unit; and an amount of characteristics extracting unit for extracting amounts of characteristics including a plurality of parameters from the target signals. Further, the working process monitoring device includes a material inspecting unit for detecting whether a material of a portion of the workpiece currently being processed is normal in quality or not, wherein the material inspecting unit employs a neural network trained by using amounts of characteristics extracted from target signals obtained while processing a workpiece made of a normal quality material.
1 . A working process monitoring device, comprising:
a sensor unit for detecting at least one of vibrations and sound waves produced while processing a workpiece by a working machine rotatably driven by a driving unit;
a signal input unit for extracting target signals from an electric signal outputted from the sensor unit;
an amount of characteristics extracting unit for extracting amounts of characteristics including a plurality of parameters from the target signals; and
a material inspecting unit for detecting whether a material of a portion of the workpiece currently being processed is normal in quality or not, wherein the material inspecting unit employs a neural network trained by using amounts of characteristics extracted from target signals obtained while processing a workpiece made of a normal quality material.
2 . The working process monitoring device of claim 1 , wherein the workpiece is wood, and the working machine is a cutting device having a saw blade driven by the driving unit, and
wherein the working process monitoring device further comprising a machining terminating unit which terminates machining operation of the workpiece when the material inspecting unit detects that the material of the portion of the workpiece is not normal.
3 . The working process monitoring device of claim 2 , wherein the saw blade is disposed at the working machine to cut the workpiece across wood grain thereof, and at least one of a cutting speed and a relative feed speed between the workpiece and the saw blade is controllable, and
wherein early wood portions and late wood portions of the workpiece are treated as normal material portions among portions being machined,
the working process monitoring device further comprising a speed control unit which controls at least one of the cutting speed and the feed speed so that an amount of contact per unit time that saw teeth of the saw blade is in contact with the workpiece while cutting the late wood portions is greater than that while cutting the early wood portions.
4 . The working process monitoring device of claim 1 , wherein the neural network is a competitive learning neural network.