Abstract
Described in this paper, is a pneumatic logic device which functions as an exclusive-OR gate. Two same size of bellows are connected in series with a plate which closes movable ends of the bellows. A side plane of the plate has a rectangular shape, on which a groove is made longitudinally. The outlet of a rectangular nozzle faces the side plane at a small distance.
Fluid is supplied from a constant pressure source to the nozzle through an ejector-type throttle and it flows out to the atmosphere through the gap between the nozzle and its counter face. Inupt pressure signals are introduced in the bellows, and the pressure in the back-space of the ejector throttle is employed as the output of the device. When pressure in both of the bellows are equal, the outlet of the nozzle faces to the groove, and the pressure of the output chamber maintains low level due to the low fluidic resistance at the nozzle outlet. When a high level pressure is put into one side of the bellows and low level pressure is introduced in the other side, the plate displaces so as to cover the outlet of the nozzle with the side plane, and the output pressure maintains high level.
