(57) The invention provides a nozzle for a jet printer and a method of producing same.
The nozzle of the invention comprises a housing (1) having an inlet (2) connectable
to a source of liquid under pressure and an outlet orifice (3). The housing (1) comprises
an inlet portion (4) and an outlet portion (5) which makes screw-threaded or other
engagement with the inlet portion (4) whereby the portions (4,5) can be adjusted relative
to one another to vary the length of the liquid path between the inlet (2) and the
outlet orifice (3). Vibrating means (8) is provided for applying regular pulses to
a stream of liquid issuing from the outlet orifice (3) to cause the stream to break-up
into drops of repeatable size and spacing. Preferably the housing portions (4,5) are
adjusted to adjust the resonant length of the liquid path to the resonant frequency
of the vibrating means (8).
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