How can I create a gear mate that only activates when the gears are engaged?

Howdy. New to SolidWorks, wondering if there is a way to make it so the gears on this can opener only activate when they are engaged. I am able to do a gear mate so they turn at the same rate, but the problem is that they turn even when they are not touching. I am thinking there must be some way to activate the gear mate only when the angle between the two handles are zero degrees or something, but I can't find anything like that. Any ideas? Thanks.

SolidworksAssemblies