US PATENT SUBCLASS 271 / 260-- .~.~.~.~ Pneumatic sensors (e.g., to sense superposed sheets)

US PATENT SUBCLASS 271 / 260
.~.~.~.~ Pneumatic sensors (e.g., to sense superposed sheets)

Current as of: June, 1999
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271 /	HD	SHEET FEEDING OR DELIVERING

8.1	DF	FEEDING {8}
256	DF	.~ With means to interrupt feeding {2}
258.01	DF	.~.~ Responsive to sheet sensor {6}
259	DF	.~.~.~ Plural sensors {2}
260		.~.~.~.~ Pneumatic sensors (e.g., to sense superposed sheets)

DEFINITION

Classification: 271/260

(under subclass 259) Device wherein the detecting means utilize air pressure or suction in their activating circuitry.

(1) Note. This subclass is for a device wherein two sensers are opposed to each other, and are located so that a succession of sheets pass between the sensers with the surfaces of the sheets adjacent to the sensers. Air, usually suction, applied to the sensers will detect the presence of a single passing sheet by activating one senser, but will detect the presence of superposed (i.e., doubled) sheets by activating both sensers.