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On The Spot Precision Engineering.
I call up the service Deptartment of the company that makes this machine. I explain my problem to the phone receptionist and she connects me to one of the Service Technicians who has been with the company for a long time. I describe to him the electric cabinet layout that I have and he tells me what each relay in the cabinet is supposed to do. One of them turns out to be for the one signal I was looking for. I told him the film was jamming constantly because it was being fed down while the knife was not yet retracted. Everytime this happened the machine went crazy and would run nonstop and jam dozens of feet of sleeve material into the blade until the overloads on the motor popped. These jams took 3 to 10 minutes to clear each time because of all the damaged sleeve material that had to be removed.
He told me the knife position is what generates the start cycle signal. There has to be a proximity switch mounted somewhere that detects the position of the main drive shaft when the knife is in the retracted position. This switch energizes relay R5, which then creates a path for the "Bottle is present" signal to pass through and start the clutch/brake sequencer. I thanked him for all of his help and hung up the phone. Now I had what I needed to know.