Diagram to show static electricity

[CmdrSpock]

static electricity diagram

Hello! I am new here!
I need your help...
How would I draw a simple diagram to show how static electricity is made use of in a photocopier to position the black toner where is needed.
It sounds a litte bit tricky and I think how it would looks like.
Thanks in Advance

 

[BOAS]

Here is a typical diagram

 

[nsaspook]

It's a fairly simple process overall to produce quality images and it's easier to understand when shown in the right sequence as this link does.
Toner Drum