Metal deforming – With means to drive tool – Including link-actuated tool support
Patent
1989-01-13
1990-10-02
Jones, David
Metal deforming
With means to drive tool
Including link-actuated tool support
72454, 72443, 100281, B21J 918
Patent
active
049599895
ABSTRACT:
A press for performing a work operation on a workpiece including a yoke defining a central bore, a ram mounted for reciprocal movement in the bore and carrying a fabricating tool on one end of the ram, an electric motor secured to an end wall of the yoke and having an output shaft passing through the end wall of the yoke, a ball screw driven by the output shaft of the motor and positioned in the bore of the yoke, a ball nut mounted in the bore on the ball screw, and a force multiplying mechanism interconnecting the ball nut and the ram and operative to move the ram to a preparatory position and thereafter multiply the force applied to the ram to facilitate the performance of the work operation. The force multiplying mechanism includes a linkage system interconnecting the nut and the ram and including a final link which moves into position in proximity of the line of action of the ram as the tool reaches its working position so that subsequent movement of the link toward the line of action multiplies the force exerted on the ram and thereby on the tool. The electric motor is an AC servo motor and and AC servo controller is provided for coaction with the motor to enable the motor to be precisely programmed to provide a predetermined number of revolutions to the ball screw so as to provide a predetermined desired forward stroking movement of the force multiplying mechanism.
REFERENCES:
patent: 3661008 (1972-05-01), Richardson
patent: 3730044 (1973-05-01), Sawdon
patent: 3871225 (1975-03-01), Bachmann et al.
patent: 3919876 (1975-11-01), Bakermans
patent: 4360335 (1982-11-01), West
patent: 4434646 (1984-03-01), Maeda et al.
patent: 4449421 (1984-05-01), Olschewski et al.
patent: 4781568 (1988-11-01), Inaba
BTM Corporation-Bulletin Nos. 47 and 31.1, "A New Breed of Power" & Operation of Press.
Obrecht Robert E.
Waltonen Edward J.
Jones David
REO Hydraulic Pierce & Form
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