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Vous êtes ici : History of computer to caster > MacMono Interface > Overview of the Composition Caster |
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Overview of the Composition Caster Tuesday February 17th, 2004, par Rich Hopkins
Overview of the Composition Caster showing the two modifications necessary for changeover from paper ribbon operation. A shows the location of two boards containing air valves which are operated by the interface. These components are mounted on top of a "sawed off" paper tower. Connections to the machine’s air system are through thesawed off air tubes from the original paper tower. It is mounted with the standard four screws of the paper tower. B shows the "stepping" mechanicsm which is activated by the Monotype’s paper tower cam lever. Its installation requires drilling and tapping the machine’s frame, and screwing to the frame so it will be met properly by the cam lever when it raises and lowers in the normal cycling of the machine. Close-up of the stepping mechanism as mounted on the machine’s frame and the paper tower cam lever. The computer interface is paced by this "stepper" and does not send any code until the stepper says the machine is ready to receive one. If the caster is idle, the computer interace remains idle too, awaiting a message from the "stepper" to send the next code. The computer program steps only when so instructed by this sensor, and thus, the speed of operation is determined by the caster itself, not the computer program. The letter C is superimposed on the cut-off brass air tubes of the original paper tower which now are connected to plastic tubes that, in turn, go to the air valves and control air to the machine. D is a supplementary air filtering system to protect the mechanism from air and foreign matter. E shows the air supply coming into the board. F shows one of four rows of eight solenoid-operated air valves which drive the machine.G is just below one of the red LEDs which light up each time the corresponding air valve directed to open. Postcriptum
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