Nikon R 10's additional claw

[Maurizio Di Cintio]

Hi, all. I have recently acquired this camera which looks like perfect both cosmetically and technically. But I have a question on the additional claw. As many of you know, this camera features an additional double toothed claw which is meant for perfect and consistent registration when shooting in reverse (this is the only camera which can do that: reverse filming): prior to get one and see it with my eyes, I used to think this claw to be retracted during normal filming. Instead it's always in position but is totally motionless, even when it should transport film backwards: everything is done by the standard claw. So anybody can clarify the actual function of this claw and how it works, please?
Thank you.

[aj]

Try researching the forum. Use google and plenty should show It has been discussed a number of times.

The 2nd R10 claw is not a thing which pushes the film like the 1st claw. I.e. it is not travelling along with the film up or down!

This 2nd thing is a stoppin which lands through the perforation and hits the cartridge pressureplate. It prevents the film from moving when then the 1st claw is not pushing the film. Which on all other super-8 cameras is left by design to the friction in the cartridges but which the Nikon R10 designers thought better to secure with a ramped stop pin.
The stop pin function is emplemented by two pins of which only one is active at any time. One for forward and one for rewind. It resembles a woodpecker bill. A spring drives it toward the plate. It has ramp to let the film pass at a certain pullforce.


You can see them change when you use the FOR/REW slider on the control panel.

[Maurizio Di Cintio]

Thank you so much, Andrè. Now I see it. The "Fow/Rew" selector itself modifies the way this double-tooth stop-pin protrudes into the film gate. Now it all makes sense!!! And I feel reassured: I was starting to suspect something wrong in my R10... :mrgreen:

[nikonr10]

Try researching the forum. Use google and plenty should show It has been discussed a number of times.

The 2nd R10 claw is not a thing which pushes the film like the 1st claw. I.e. it is not travelling along with the film up or down!

This 2nd thing is a stoppin which lands through the perforation and hits the cartridge pressureplate. It prevents the film from moving when then the 1st claw is not pushing the film. Which on all other super-8 cameras is left by design to the friction in the cartridges but which the Nikon R10 designers thought better to secure with a ramped stop pin.
The stop pin function is emplemented by two pins of which only one is active at any time. One for forward and one for rewind. It resembles a woodpecker bill. A spring drives it toward the plate. It has ramp to let the film pass at a certain pullforce.


You can see them change when you use the FOR/REW slider on the control panel.

And there I am" thinking What a big beast" , with them to Two claw's , Always good to know' AJ ,

[aj]

Here are things more visual.
Remember the film is in a tight channel formed by the Aperture and Pressure plate.
The claw pushes the film ahead through this channel. Or pulls when in REW

Either of the stop pins is pushed forward and anchors the film in position when it is not pushed.
Also its slightly rounded tip forces every perforation in the exact position :idea:
I.e. the pull of the cartridges cannot yank the film further unless it is really strong.
But then there is something really wrong with the friction adjustment.