(under subclass 90) Device wherein the sheet-removing means includes a source of air or other gaseous medium subjected to above-atmospheric pressure.
(1) Note. A distinction should be made between a device using pressurized gas for the purpose of causing or aiding removal of a sheet from a stack (found in this and indented subclasses), a device using pressurized gas for the purpose of restraining feeding of sheets other than the foremost sheet (found in subclass 104), and a device using pressurized gas for the purpose of fluffing or riffling the sheets of a stack while the sheets remain in the stack (found in subclass 105).
(2) Note. Some patents in this subclass disclose the use of Bernoulli's Principle for the movement of sheets. That principle includes the use of air under relatively high pressure and velocity to generate an area of low pressure adjacent a surface.
