Selectric Resources

 

STROKE COUNTER OPERATIONAL THEORY

 

The purpose of the stroke counter is to record usage of the “Selectric,” “Selectric” II and Correcting “Selectric” typewriters. This is done by a mechanical counter mounted inside the

power frame above the left-hand cam of the cycle shaft assembly (Figure 1).

 

The stroke counter arm is spring loaded against the cam and moves up and down with the cam surface each time the cycle shaft operates. The left-hand dust shield has a part removed to allow the counter to be read.

 

Stroke counters for the “Selectric,” “Selectric” II and Correcting “Selectric” typewriters are available with a 10:1, 100:1 or 240:1 ratio. This means that for every 100 print operations, the 100:1 ratio counter will advance 1, etc.

Figure 1 — Stroke Counter