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US 5,402,300 AGranted
Collet lifting mechanism for die handling unit
AssigneeRohm Co., Ltd.
InventorKazuya Ikoma
Life of this patent
Estimating the term…
Abstract
A magnet is fixed to the inner surface of the ceiling of a cylinder-like yoke which is closed at the top, and a holding plate is attached to the yoke through a slider. A coil and collet are unitedly attached to the holding plate. When a current is passed through the coil, a force proportional to the current acts on the coil so that a constant load is applied to the collet.
Claims3
A collet lifting mechanism for a die handling unit, comprising:
- a yoke;
- a magnet fixed to said yoke;
- a coil which is energizable to move relatively with respect to said yoke by an electromagnetic force when a current is passed through said coil, said electromagnetic force being generated by the current and a magnetic flux produced by said magnet;
- a collet which is connected to said coil and relatively movable in the same direction as said coil;
- position detecting means for detecting the position of the collet with respect to a desired collect engagement location;
- and
- control means responsive to the position detecting means for controlling the current supplied to the coil so as to control the force applied by the collet for a selected period of time after the collet has moved within the predetermined distance from the desired location.
4 more elements
Dependencies are inferred from the claim text.