A new rotary bottle capping machine had 12 chuck head controlled by pneumatic system. The pneumatic solenoid valves were controlled by the approach switch, and the switch were triggered by the cam on a rotary plate.

The machine was never in properly functioning condition since it was installed in the production floor. The caps were broken, dropped, or oblique on the bottles.

Through carefully inspection , it was found that the trigger time of the solenoid was inccrect. There was a lag angle between the actual and ideal trigger position.

After modifying the rotary plate and relocated the cam, machine run smoothly.