Dual-speed mold-closing system
AssigneeSig Kautex GmbH & Co. KG
InventorRaimund Stocksiefen
Life of this patent
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Abstract
A mold system has a pair of mold halves movable toward and away from each other, a threaded spindle coupled to one of the mold halves, and a nut threaded on the spindle and coupled to the other of the mold halves. A high-speed low-torque brakable spindle motor is connected to the spindle and operable to rotate the spindle in the nut and a low-speed high-torque nut motor separate from the spindle motor is connected to the nut and operable to rotate the nut on the spindle. In a first mold-closing stage the spindle motor is operated to rotate the spindle in the nut and move the mold-halves rapidly toward each other. Thereafter in a second and subsequent mold-clamping stage the spindle motor is braked and the nut motor is operated to rotate the nut on the spindle and press the mold halves against each other.
Claims9
A method of operating a mold system having:
- a pair of mold halves movable toward and away from each other;
- a threaded spindle coupled to one of the mold halves;
- a nut threaded on the spindle and coupled to the other of the mold halves;
- a brakable spindle motor connected to the spindle and operable to rotate the spindle in the nut;
- a nut motor separate from the spindle motor, connected to the nut, and operable to rotate the nut on the spindle, the method comprising the steps of:
- in a first mold-closing stage operating the spindle motor to rotate the spindle in the nut and move the mold-halves toward each other, and
- thereafter in a second and subsequent mold-clamping stage braking the spindle motor and operating the nut motor to rotate the nut on the spindle and press the mold halves against each other.
In combination with a mold having a pair of mold halves movable toward and away from each other, a mold-closing system comprising:
- a threaded spindle coupled to one of the mold halves;
- a nut threaded on the spindle and coupled to the other of the mold halves;
- a brakable spindle motor connected to the spindle and operable to rotate the spindle in the nut;
- a nut motor separate from the spindle motor, connected to the nut, and operable to rotate the nut on the spindle;
- and control means for
- in a mold-closing stage operating the spindle motor to rotate the spindle in the nut and move the mold-halves toward each other, and
- in a mold-clamping stage braking the spindle motor and operating the nut motor to rotate the nut on the spindle and press the mold halves against each other.
Dependencies are inferred from the claim text.