Metal treatment – Compositions – Heat treating
Patent
1987-09-10
1988-09-27
Stallard, Wayland
Metal treatment
Compositions
Heat treating
266 76, 266 92, 21912403, B23K 710
Patent
active
047739460
ABSTRACT:
There is provided a device for controlling the vertical operating gap between the lower end of a cutting head, such as a frame cutting torch, and a generally flat workpiece positioned below the cutting head as the head and workpiece are moved relative to each other for cutting the workpiece along a preselected cutting path wherein the device includes a plurality of elongated feelers dangling vertically downwardly from the cutting head toward the workpiece with each of the feelers having an upper end and a lower terminal end, means for supporting the feelers at the upper end at positions spaced angularly around the cutting head with the terminal, lower ends at the same vertical height with respect to the lower end of the cutting head, means for allowing free upward movement of the lower ends upon engagement of the lower ends with the workpiece, such as allowed by downwardly hanging chains or loosely held rigid rods, feedback means for driving the motor in a first direction moving the head upwardly from the workpiece and a second direction moving the head downwardly toward the workpiece to maintain the operating gap at a preselected value wherein the feedback means includes sensing means for maintaining all the downwardly dangling feelers spaced from the workpiece while the lower end of the feelers closest to the workpiece is maintained at a preselected distance from the workpiece. This one feeler changes from time-to-time as the sensing device carried by the cutting torch moves along the workpiece to sense impending changes in the height of the workpiece with respect to the present setting of the cutting torch or other cutting head.
REFERENCES:
patent: 1337305 (1920-04-01), Bennett
patent: 3595545 (1971-07-01), Sitnichenko et al.
patent: 4013277 (1977-03-01), Schmitt
patent: 4363468 (1982-12-01), Noe
Cleveland Machine Controls, Inc.
Stallard Wayland
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