Iskra's
Advance Mechanism

WARNING: You may break or damage your camera if your not careful.
I'm not responsible if you follow the information on this page. Proceed at your own risk or return now.
 

Not much here yet

I have not disassembled the mechanism.

To get to the advance mechanism: remove advance knob, and the screw underneath. Inside the body, on the left side, remove the one screw (if you remove the spool pin, it's easier). The top will now come off. Watch for the shaft that opens the front, it sits loose in a hole.

If you going to see how it works, put the advance knob back on, otherwise the gear under the knob will move out of place.



The back pushes on a pin, which moves a set of levers to allow the film counter to count up. Without taking mine apart, it appears to activate a one-way clutch underneath the stack. If the spiked gear is pushed down too far, it won't turn. The long spring on the left pulls on the counter wheel.  The spiked gear connects to the counter wheel via a reduction gear.  The lever it ends at is made of two parts.  One thin wrap around piece to hold the shaft end and also to act as the zero stop for the counter.  The other to for the spring and over to the lever the back pushes down.  It appears the thin part that holds the shaft end can be moved to adjust how far the spiked wheel needs to be depressed before it engages the large gear.  On mine it appears to be soldered in place.


When the film arrives at the spiked gear, it get pushed down to the gear and it starts moving the film counter. The film counter has two plates with slots. Bottom slotted plate is spring loaded, it's the first one to catch the locking tab. The top slotted plate is then caught by the tab, the advance knob is now locked.On mine most of the screws were loose. On mine the front one that the locking tab pivots on, can't be fully tightened. Advance knob gear: top teeth are for the one way turning. Bottom gear is the part the locking tab uses to lock the advance knob.





Advance knob gear: top teeth are for the one way turning. Bottom gear is the part the locking tab uses to lock the advance knob.
 

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ęStephen Castello All Rights Reserved
Last Update: 12/16/2004