Pulse generator for intermittently energizing an actuating coil

Details Pulse generator for intermittently energizing an actuating coil Pulse generator for intermittently energizing an actuating coil

1977-05-26

1979-03-06

Miller, Jr., Stanley D.

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

307255, 307270, 307296R, 361152, B05B 130, H03K 100

Patent

active

041426843

ABSTRACT:
A substrate to be patterned, such as a textile web, is moved past an array of nozzles with discharge orifices closely spaced from its surface, the substrate being firmly backed at locations confronting the nozzles by being drawn against a supporting conveyor or by being led around rollers. The nozzles are electromagnetically operated by needle valves, the valve needles being carried by membranes under substantially balanced pressures from the printing liquor and from a fluid such as compressed air. The electromagnetic coils are intermittantly energized by a programmed pulse generator with a large but brief driving current followed by a low holding current, the pulse generator including two complementary power transistors in series with a coil winding. A dyestuff applicator carrying one or more of such nozzles may be transversely displaceable across the substrate, under the control of a programmer, between intermittent advances of the substrate in its longitudinal direction.

REFERENCES:
patent: 3143668 (1964-02-01), Bloodworth et al.
patent: 3546487 (1970-12-01), Espinal
patent: 3766432 (1973-10-01), Markowitz et al.

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