Patent ID: 6039510
Filing Date: 2000-03-21
Classification: B65G

Abstract:
A pneumatic transmission system comprising:a first station for sending or receiving a carrier;a second station for sending or receiving said carrier;a transport conduit connected between said first station and said second station, wherein said transport conduit is capable of permitting a transfer of said carrier between said first station and said second station;a supply/exhaust branch connected to said first station such that air can flow between said supply/exhaust branch and said first station, said supply/exhaust branch having an opening which can serve as an air inlet for providing the air from atmosphere through said supply/exhaust branch to the pneumatic transmission system and as an air vent for exhausting the air from the pneumatic transmission system through the supply/exhaust branch to the atmosphere;a first motor blower positioned within said supply/exhaust branch, wherein said first motor blower is capable of moving a volume of the air through said supply/exhaust branch and said transport conduit in a first direction;a valve positioned within said supply/exhaust branch, wherein said valve is capable of stopping the flow of the air through said supply/exhaust branch and said transport conduit;a sensor associated with said transport conduit so that said sensor is capable of detecting a presence of said carrier at a predetermined location in said transport conduit associated with an approach of said carrier to one of said first station and said second station and of generating a control signal in response to a detection of said carrier by said sensor;a controller coupled to said sensor and to said first motor blower, wherein said controller activates said first motor blower to move said carrier between said first station and said second station and then deactivates said first blower motor and closes said valve in response to said control signal from said sensor, indicating the detection of said carrier at said predetermined location to thereby form an air block within said supply/exhaust branch to decrease a differential pressure across said carrier and cause said carrier to slow down as said carrier approaches said one of said first station and said second station; anda timer capable of providing a timing control signal when a predetermined amount of time has elapsed, and wherein said controller activates said timer in response to the detection of said carrier at said predetermined location in said transport conduit associated with the approach of said carrier to said one of said first station and said second station and said controller opens said valve in response to said timing control signal.