초록 ▼

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 nozzl

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 energized by a generator of short current pulses separated by a low holding current, the 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.

대표청구항 ▼

A machine for applying a pattern to a substrate, comprising: applicator means including at least one nozzle for spraying dyestuff onto a substrate to be patterned, said nozzle being provided with a discharge orifice and with valve means for controlling the rate of discharge of dyestuff through said

A machine for applying a pattern to a substrate, comprising: applicator means including at least one nozzle for spraying dyestuff onto a substrate to be patterned, said nozzle being provided with a discharge orifice and with valve means for controlling the rate of discharge of dyestuff through said orifice; transport means including a perforated conveyor for moving said substrate past said nozzle in the immediate vicinity of said orifice, said transport means including a support roller confronting said nozzle for backstopping a portion of said substrate sprayed with said dyestuff; and suction means for drawing said portion of said substrate onto said conveyor in the vicinity of said nozzle.