Driver for RICOH AFICIO SP 1100SF

Hi,
I searched your site for the driver I need to connect the above printer on my IMAC OS X 10.7.4, but I didn't find it.
I tried Apple support, Ricoh support but with no success.
Would you have an idea ?
Thanks

Guillaume
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/