Want to refresh Image Capture without disconnecting device

I'm using Image Capture to import iPad Screen captures to my iMac. The problem is that it "sees" only those images that were on the iPad when Image Capture started up.

In order to see subsequent images, I have to physically disconnect ("pull the plug") my iPad from my Mac. After I reconnect, Image Capture mounts the iPad anew and the the new images are visible.

Quiting Image Capture and relaunching it does not have the same effect, so it is obviously some OS function that is mounting/unmounting the iPad device.

Is there any OSX command that will do what I want (I'm comfortable using Terminal). I guess it would be something like mounting/ejecting a disk, but for a USB device instead.

I'd welcome info on any alternative ways of getting those new images over to my Mac for processing.

Thanks for any help.

Frank