Integrated circuit placement device vacuum head

DETAILED DESCRIPTION OF THE INVENTION, appended claims, and accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING FIG.
1 is a side sectional view of a vacuum head in accordance with the present invention illustrating the inner tip assembly in its first, or retracted, position; FIG.
2 is a view similar to that of FIG.
1 with the inner tip assembly in its second or extended position; and FIG.
3 is an enlarged sectional detail view taken generally along the line 3--3 of FIG.
2.
DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawing wherein like reference numerals denote like elements throughout the several views, FIGS.
1 and 2 illustrate a vacuum head 10 in accordance with the present invention.
The invention is shown as being used in cooperation with a pair of holding and centering jaws 12, 14 by which an integrated circuit device 16, 16' is centered on the vacuum head 10 with respect to a central longitudinal axis (not shown) thereof.
The head 10 comprises an outer housing 18 which has a casing 20 generally circularly cylindrical along much of its length.
In operation, the housing would typically be disposed so that the central longitudinal axis thereof was oriented substantially vertically.
With such an orientation, a surface 22 of the housing 18 having an orifice 24 therethrough is disposed generally horizontally in a tapered fitting 26 at the lower end of the casing 20.
The casing 20 is closed at its upper end by an end cap 28, the end cap 28 typically being sealed so that vacuum induced within a chamber 30 defined within the casing 20 will not escape upwardly.
A vacuum inlet 32 is shown extending into the chamber 30 from the right side of the casing 20.
FIGS.
1 and 2 show an inner tip assembly 34 enclosed within the barrel housing casing 20 in a concentric relationship.
The inner tip assembly 34 is intended to be selectively reciprocated along the axis of the outer housing 20 between a first, retracted position, as seen in FIG.
1, and a second, extended position, as seen in FIG