Recorders – Record receiver deforming
Patent
1979-01-31
1980-07-01
Miller, Jr., George H.
Recorders
Record receiver deforming
G01D 1518
Patent
active
042109205
ABSTRACT:
An ink jet printing head (10) is provided for use in an ink jet printing device, having an ink supply reservoir (14) formed in a manifold (12) for supplying ink to a plurality of orifices (16) formed in rows in an orifice plate (18) extending longitudinally along the bottom of the manifold (12) and forming the lower part of the reservoir (14) through which a plurality of droplets of fluid can be expelled under pressure. In one embodiment, the upper surface of the reservoir (14) is closed by a vibrationally flexible and magnetically active diaphragm plate (32) having its lower surface in contact with the upper surface of the liquid in the reservoir (14). An electromagnetic device is provided having a portion (40) coupled to the diaphragm (32) to form a magnetic flux path therethrough and another portion (38) positioned adjacent and above the diaphragm (32) so that that portion (38) and the diaphragm (32) form opposite poles of the electromagnet. A signal generator means (48) then imposes an alternating electric current of the desired frequency on the electromagnetic device so as to vibrate the diaphragm (32) and cause vibration of the liquid which in turn produces uniform series of droplets from the orifices (16). An alternative structure utilizes a thin orifice plate (62) with the electromagnetic device coupled to the orifice plate (62) rather than the diaphragm (32) so that the orifice plate (62) is vibrated to cause a uniform series of droplets to be expelled from the orifices (16). Both embodiments also preferably are provided with a bias (50) on the diaphragm (32) or the orifice plate (62), whichever is vibrated, which then only permits vibration of the orifice plate (62) or diaphragm (32) in one direction.
REFERENCES:
patent: 3287734 (1966-11-01), Kazan
patent: 3373437 (1968-03-01), Sweet et al.
patent: 3596275 (1971-07-01), Sweet
patent: 3701476 (1972-10-01), Houser
patent: 3739393 (1973-06-01), Lyon et al.
patent: 4138687 (1979-02-01), Cha et al.
Burnett James E.
Kenworthy E. J. Doyle
Miller Jr. George H.
The Mead Corporation
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