Shutter Blade Action In Single-Frame Exposure - Polaroid Miniportrait 455 Repair Manual

Figure 2-8. Shutter blade action in single-frame exposure
3. As disk (A) rotates further (as in 1. above), (a2) and (b2) are controlled by pin (d),
and (b3) is controlled by (d'). The three exposure windows "A", "B" and "D" are again
blocked.
4. When the foregoing process has been repeated three more times, the single film
frame in the film holder will have four separate portrait exposures on it.
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S4 Switch