US PATENT SUBCLASS 271 / 90
.~.~ Pneumatic

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

8.1  DF  FEEDING {8}
18  DF  .~ Separators {8}
90.~.~ Pneumatic {10}
91  DF  .~.~.~> Plural, relatively-moving suction members {2}
94  DF  .~.~.~> Unidirectionally-moving suction member or surface {2}
97  DF  .~.~.~> Sheet removal by pressurized gas {1}
99  DF  .~.~.~> Suction member acting on bottom of pack {2}
103  DF  .~.~.~> Sheet-moving action of suction member results from engagement with sheet
104  DF  .~.~.~> With means to restrain feed of next sheet
105  DF  .~.~.~> Means effecting preliminary operation on sheets in pack {1}
107  DF  .~.~.~> Oscillating suction member
108  DF  .~.~.~> Controlled by valve means
30.1  DF  .~.~.~> Pack advancer {2}

DEFINITION

Classification: 271/90

(under subclass 8.1) Device wherein the sheet-removing means engages an individual sheet by a gaseous fluid medium under subatmospheric or above-atmospheric pressure.

(1) Note. Although in most devices the gaseous fluid is

air, either under suction or under pressure, or both, the use of a special fluid other than air (e.g., steam) is not barred, if the fluid is for the purpose of preconditioning a stack of sheets (e.g., fluffing the sheets of the stack with the hot, moist steam) to facilitate subsequent separation of the sheets from the stack.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5, 11+, 20, for a device using pneumatic feed means;

112, 132, for a device wherein suction assists a feed means.

SEE OR SEARCH CLASS 221, Article Dispensing,

211, for article dispensers not otherwise provided for in which suction carrier means is effective to engage and remove articles from a source of supply, and subclass 278 for fluid pressure discharge assistants for articles.