print wheel

He was the first to use printing wheels methods.

There is a blank space on the print wheel for non-printing columns.

The 407 also had exits from each print wheel that could then feed the counters for addition or subtraction.

It used a print barrel made up of 120 print wheels each with 50 characters around its edge.

The 1130 had 120 power transistors, each wired to the print wheel solenoid for a printer column.

As the set of 120 print wheels spun, the 1130 received an interrupt as each of the possible 48 characters moved into position.

An 'alignment bail' would then seat itself in between the teeth of the 'print wheels' to perform vertical alignment.

The unit consists of a clock and a precision gear-based set of three printing wheels, which print on standardized accounting tickets.

The IBM 1132 printer relied on the 1130 processor rather than internal logic to determine when to fire the print wheels as they rotated.

The printing driver software had to quickly output a 120 bit vector designating which transistors were to fire to press the print wheel against the ribbon and paper.

A 'card shield' would grab the punched card to hold it in place and lower it a position almost touching the inked print ribbon and print wheel.

The printer included several different 130-character "daisy" print wheels (e.g., Courier, Prestige Elite, Gothic, Executive) in English, French, German, and other languages.

In a typical drum printer design, a fixed font character set is engraved onto the periphery of a number of print wheels, the number matching the number of columns (letters in a line) the printer could print.

At the correct time 60 'hammers', under spring tension and controlled by a cam, would 'fire' pressing the card / inked ribbon onto the print wheel and leaving an inked impression of the character on the surface of the punched card.

As the card was being read and positioned for printing, a 'mechanical bail' driven by large steel cams would raise 60 geared 'lifter bars' which engaged 60 'racks' which engaged 60 'intermediate gears', which drove 60 'print wheels'.

There were special detachable wheel movement bars and their position on the drum could change, interchangeable print wheels, custom pinwheel labels, versions with One-time Tape reader instead of wheels [2], versions that only enciphered numbers, and many other details that influenced the enciphering process.

Using the impulse from the 'contact roll' / 'card brush' / 'wire contact relay' circuitry, a 'push rod' would latch (stop) the individual 'lifter bar' on its downward motion with the character to be printed correctly positioned on the print wheel and facing 1 of 60 'print hammers'.