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Self Controlled Pneumatic Print Hammer Actuator

IP.com Disclosure Number: IPCOM000091056D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bahr, J: AUTHOR [+2]

Abstract

The drawing, at the two essential points a and b, depicts the pressure cycle for one complete operation. After solenoid valve 1 is actuated, foil valve 2 starts opening. Pressure Pa at point a drops rapidly, since storage chamber 3, which prior to opening valve 1 is pressureless, has to be replenished. After pressure Pa decreases to a certain level, foil valve 4 starts opening. Pressure Pb at point b rises, while pressure Pa further decreases. The size of storage chamber 3 has to be chosen correspondingly. Pressure Pa reaches the minimum level Pa min and, after replenishing storage chamber 3, rises to a value which by adjusting throttles 5 and 6 is set to a required pressure range.

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Self Controlled Pneumatic Print Hammer Actuator

The drawing, at the two essential points a and b, depicts the pressure cycle for one complete operation. After solenoid valve 1 is actuated, foil valve 2 starts opening. Pressure Pa at point a drops rapidly, since storage chamber 3, which prior to opening valve 1 is pressureless, has to be replenished. After pressure Pa decreases to a certain level, foil valve 4 starts opening. Pressure Pb at point b rises, while pressure Pa further decreases. The size of storage chamber 3 has to be chosen correspondingly. Pressure Pa reaches the minimum level Pa min and, after replenishing storage chamber 3, rises to a value which by adjusting throttles 5 and 6 is set to a required pressure range. At that time pressure Pb reaches its maximum level almost corresponding to the value P7 of compressed- air source 7 to prevent valve 4 from closing. As pressure Pb rises, the speed of hammer piston 8 increases. After a certain interval, its rear edge releases vents 9, at which stage the leading edge of piston 8 reaches the paper and the type respectively. Pressure Pb decreases abruptly to a value below that of pressure Pa so that valve 4 closes to interrupt the compressed-air flow. Piston 8 performs its return stroke. The residual air in the line and cylinder area between piston 8 and valve 4 is led to the outside through throttle 6. Compression of the air, which only escapes slowly through throttle 6, causes pressure Pb to rise once agai...