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US 3,943,527 AGranted
Noncontacting marker
AssigneeRCA Corporation
InventorJohn Charles Hartmann
Life of this patent
Estimating the term…
Abstract
A noncontacting marking apparatus for ejecting, upon receipt of a control signal, a drop of marking liquid for marking purposes. The amount of marking liquid is controllable. A tube couples the ejection point of the marker to a source of vacuum for removing excess liquid.
Claims5
A liquid marking device comprising, in combination:
- means containing first, second and third interconnected apertures, said first aperture being coupled to a source of marking liquid, said second aperture being adapted to receive a plunger means, said third aperture forming a nozzle;
- a plunger residing in said second aperture forming a liquid receiving chamber therein, said plunger being movable between two positions, the first being such as to increase the volume of said chamber, the second being such as to reduce the volume of said chamber and to close the interconnection between said first and second apertures;
- first power driven means coupled to said plunger for moving said plunger to said first position for receiving said marking liquid in said chamber;
- and
- second power driven means for moving said plunger to said second position for forcing said liquid to be ejected from said nozzle.
2 more elements
Non-contacting marking apparatus comprising in combination:
- means including a chamber coupled to a source of marking liquid and containing an ejection nozzle;
- power driven plunger means in said chamber movable between a first position in which liquid is moved into said chamber and a second position in which liquid is driven out of said nozzle to mark an item to be marked;
- means extending between the exit point of said nozzle and a source of vaccum for drawing excess liquid from said nozzle, thereby preventing it from dropping onto said item.
Apparatus for marking an item for identification without contacting the item comprising in combination:
- means responsive to a signal that an item to be marked is in marking relationship with said marking apparatus for producing a marking signal;
- means responsive to said marking signal for ejecting a given quantity of a distinctive marking liquid onto said item to be marked without contacting said item;
- and
- enclosed guide means coupling the point of said marking apparatus at which said liquid is ejected with a container at lowered atmospheric pressure relative to that at said point for drawing off excess liquid which would otherwise form at the ejection point.
1 more element
Dependencies are inferred from the claim text.