Cutting – Tool engages work during dwell of intermittent workfeed – Interlock between tool actuating and work feed means
Patent
1989-12-20
1990-08-21
Yost, Frank T.
Cutting
Tool engages work during dwell of intermittent workfeed
Interlock between tool actuating and work feed means
83277, 83282, 83436, 836395, 83380, 83399, 269 30, 269222, B26D 520, B26D 542
Patent
active
049496115
ABSTRACT:
In a heavy-duty saw assembly having a base, a pair of columns, a feed carriage guidably mounted upon the columns supporting a power-driven saw, a hydraulic lift feed cylinder assembly within each column and connected to the carriage, an elongated saw train extending at right angles to the base, including a plurality of transverse rollers, a sprocket chain connected to the rollers for selective rotation in unison for intermittently feeding an elongated workpiece onto the base transversely of and under the saw, spaced normally open rear and front hydraulic vises adjustably mounted upon the base adapted to selectively grip the work, and a pair of spaced manually rotatable lead screws journaled upon the base connected to the vises respectively, the improvement of a hydraulic circuit therefor which comprises first and second hydraulic circuits, first and second power-operated hydraulic pumps for feeding pressurized liquids into the circuits and a four-way, three-position, spring centered, solenoid-activated saw carriage feed first valve in the first circuit having an outlet connected to the lift feed cylinder assemblies for selectively raising and lowering the saw feed carriage. A reversible hydraulic motor having an output drive is connected to the sprocket chain; and a four-way, three-position, spring centered, solenoid-activated second valve in the first circuit has an output connected to the hydraulic motor. A two-position, four-way, spring offset, solenoid-operated third valve in the second circuit has an outlet connected to the rear vise, and the saw carriage being initially retracted, activation of the second four-way valve and hydraulic motor first actuates the rollers. Activation of the third valve closes the rear vise upon the work and successive actuation of the first valve actuates the cylinder assemblies for feeding the saw to and through the work.
REFERENCES:
patent: 1850331 (1932-03-01), Ohler
patent: 2769224 (1956-11-01), Hake
patent: 3110206 (1963-11-01), Hake
patent: 3504585 (1970-04-01), Harris
patent: 3682030 (1972-08-01), Harris
patent: 3848493 (1974-11-01), Harris
patent: 4117756 (1978-10-01), Harris
Instruction Book Entitled "Joh. Friedrich Ohler, Hydraulic Cold Sawing Machines, Saw Sharpening Machines, Segmental Saw Blades", for the Erection, Operation and Maintenance of Model KA-1000 Cold Sawing Machines With Serial Nos. 5893 and later, by James W. George Machinery Co. of Detroit, Michigan (pp. 1-50).
Gossett Dykema
Smith Scott A.
Steel Industries, Inc.
Yost Frank T.
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