Help with ACG Klio Shutter - Opens when Cocking

s-roll89 · Oct 6, 2020

Hi all,

I am trying to repair the shutter on an old Ikonta using the "Klio" shutter (Prontor variant).

I've noticed that the driver arm (part Tr in the Prontor service manual) remains coupled to the leaf disc pin when cocking the shutter. Therefore, the shutter blades will open slightly when cocking it.

Does anyone have any suggestions on how to fix this? I'd prefer to leave the escapement in place since one of the screws is being a pain .

Thanks

shutterfinger · Oct 7, 2020

http://pheugo.com/cameras/index.php?page=klio
The operating arm is braded to the setting lever and should move freely. The arm is coupled to the blade controller with a hairpin type spring. If the arm pivot does not move freely it will bind and pull the shutter blades open. Also the delay mechanism should hold the blade controller in the closed position. Improper seating of the delay timing mechanism or wear may also cause the problem.

s-roll89 · Oct 7, 2020

shutterfinger said:
http://pheugo.com/cameras/index.php?page=klio
The operating arm is braded to the setting lever and should move freely. The arm is coupled to the blade controller with a hairpin type spring. If the arm pivot does not move freely it will bind and pull the shutter blades open. Also the delay mechanism should hold the blade controller in the closed position. Improper seating of the delay timing mechanism or wear may also cause the problem.

Hi again. When you refer to the "delay timing mechanism" are you referring to the speed escapement or the self timer? I also don't see the hairpin spring around the arm and controller pin... I wonder if I lost it.

shutterfinger · Oct 7, 2020

speed escapement.
I've got a SVS apart and it has a spring holding the controller actuation arm on the main setting lever to the blade controller. I'm beginning to think each Gauther shutter is made different regardless of the marked name/model.

s-roll89 · Oct 7, 2020

shutterfinger said:
speed escapement.
I've got a SVS apart and it has a spring holding the controller actuation arm on the main setting lever to the blade controller. I'm beginning to think each Gauther shutter is made different regardless of the marked name/model.

Is this spring the one being pointed to in the 7th picture down on the phuego website?

shutterfinger · Oct 7, 2020

s-roll89 said:
s this spring the one being pointed to in the 7th picture down on the phuego website?

Short answer, yes.
This is my Prontor S with the delay timing removed.

With the spring connected as shown in the picture the blades do not move when setting the shutter, with the spring disconnected from the blade controller lug the shutter blades move but do not open. This may vary with wear.

Follow the instructions for heat treating the newly made spring in this article
http://www.deansphotographica.com/machining/projects/springs/springs.html
I have restored or increased the tension available from a weak spring using the heat treating method described.

Help with ACG Klio Shutter - Opens when Cocking

s-roll89

shutterfinger

s-roll89

shutterfinger

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