Catching apparatus and method for jet drop recording

Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element

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118 50, 346 75, 346140R, G01D 1518

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active

039361357

ABSTRACT:
In a jet drop recording system a drop catcher includes a drop impinging face having a narrow slot at its lower edge so that drops impinging on the face may travel over it to the slot for removal from the system. A reduced pressure is maintained in the catcher to draw the recording material through the slot and the size of the slot and the pressure differential across it are adjusted so that a meniscus is formed at the mouth of the slot. The surface tension of the recording material then acts in opposition to the reduced pressure tending to draw the material into the catcher and maintains the slot full of recording material. This meniscus, in effect, forms a "seal" which prevents air from being drawn into the catcher and eliminates air currents in the vicinity of the catcher which might affect the trajectory of drops intended for deposit on the receiving member.

REFERENCES:
patent: 2676868 (1954-04-01), Jacob
patent: 3596275 (1971-07-01), Sweet
patent: 3611422 (1971-10-01), Rourke
patent: 3701476 (1972-10-01), Houser

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