What is this sensor for on roland 202?

I have a roland 202. We purchased it second hand. I cant see what this sensor does. I guess we are missing a part because I cant see how its activated.

Thanks

 

Hi sir Happy New Year
Acording withpicture designation wiring diagrama the
D10
+D12
+D15
Limit switchs No sensors

 

Thanks Chock, but its strange cause I cant see what would activate the limit switch.. there must be something missing on the machine..

I have marked where the limit switch is..

 

Hi Sir,maybe you have some lost part from the machine
Normally this l. swiths are activate by Lever, Cams, etc.
Will be a good idea if you have the DESIGNITATION wire diagram for to investigate more deeply
from you side.

 

Look to see if your pile chain has a half moon shaped eccentric on the outside of the chain links to engage the roller on the limit switch???