It's hard to make much of the appearance of the coin. Working with the words, searching on Google using Ajmer and Delhi gives the Chauhans of Ajmer and Delhi. A prominent ruler of the Chauhans was Prithviraj Chauhan, ruled 1179-1192 AD. There is no reference for Kanavjon listed on Google, but maybe there's an alternate spelling we don't know at this point.
Here are some Chauhan coins for comparison, but I'm not seeing a good match on a quick look through.
http://search.zeno.ru/index.php?v=0&ar=on&ae=on&c=&t=&k=&d=&wmin=&wmax=&smin=&smax=&m=&ymin=&ymax=&y=&u=&a=Chauhan&e=&f=0&s=0&p=1
Anyway, maybe this can serve as a starting point, maybe not. Good luck!