| 摘要 |
A torch height control apparatus with a synchronous belt drive, altering wheelbase of the wheel axis and solid body, attached to the gear belt on various mechanized shape cutting machines is provided for positioning the tip of a torch with respect to a workpiece to a predetermined height at the beginning of the cutting process, commonly known as pierce height. The system is also responsive to the torch tip collisions with the workpiece during the cutting process commonly known as vertical collision control. The system also fills the role of the upper and lower limit switch.
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