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A progressively activated vacuum head eliminates the need for multiple heads and careful component staging in automatic circuit board populating apparatus.
English (United States)
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Vacuum Head For Circuit Board Population
A progressively activated vacuum head eliminates the need for multiple
heads and careful component staging in automatic circuit board populating
With presently known apparatus having a single head large enough to handle
all components, population with incoming intermingled small and large
components requires appropriate staging or spacing in a feed rack. In the
absence of appropriate spacing, the possibility of picking more than one
component at a time will exist. This is because, for example, one large head can
overlap a number of small components. An alternative is to sense the
component size and use one of a number of heads.
Fig. 1 is a top view of a universal head 1 for handling all components
regardless of size, and illustrates the routing of a vacuum channel 2 having a
variable effective length. The leftmost pin 3 in Fig. 2 is the first pin to be affected
by a vacuum in channel 2. Each pin in Figs. 2 and 3 remains in the position
shown under the influence of gravity. When in this position, the effective length
of channel 2 extends only as far as, but does not include, pin 3. Upon the
lowering of head 1 for picking up component 4, each pin contacting component 4
will be forced upwardly to permit a vacuum path thereabout. After each pin has
contacted component 4 and been forced upwardly, the effective length of
channel 2 extends through pin 8. In order for there to be a vacuum path about
pin 8, every precedi...