Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1986-11-21
1988-04-19
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318608, 219121EU, G05B 1736
Patent
active
047392355
ABSTRACT:
In a thermal cutting machine provided with an NC system of the type having a manual pulse generator allowing the operator to manually adjust the working head height from a workpiece a profile control apparatus is provided to maintain a reference distance between the head and a non-flat workpiece. The profile control apparatus is installed in the cutting machine, by adding only a head distance sensor and a Z-axis controller in parallel with the manual pulse generator via a selector switch. The Z-axis controller generates a pulse signal having a frequency proportional to a differential voltage between a reference head height determined by the NC system and an actual head height detected by the head distance sensor to correct the reference head height from the non-flat workpiece. The V-F conversion characteristics of the Z-axis controller are of Z-type, in particular, to reduce the profile error.
REFERENCES:
patent: 3863124 (1975-01-01), Pierce et al.
patent: 3970911 (1976-07-01), Schmall
patent: 4276503 (1981-06-01), Peiffert et al.
patent: 4458190 (1984-07-01), Takawashi et al.
patent: 4560880 (1985-12-01), Petrie et al.
patent: 4571479 (1986-02-01), Maeda et al.
Aikawa Atsushi
Sengoku Akira
Amada Company Limited
Dobeck Benjamin
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