Convert pdf image to searchable pdf file

I have a Savin 4027 (same as Ricoh 2027) with scanner controller.  The machine is on an ethernet network to Windows XP machines and the machine serves as a network delivery scanner and sends scanned images to shared folders on the PC's using SMB protocol.  The scanner setting is "scan to folder" and it does not use a twain driver for this function but a proprietary "ScanRouter Lite" driver. (A twain driver is available and I use it to run OmniPage Pro).  I have been scanning in documents with "pdf" output selected; the image is viewable with Acrobat (I am using Acrobat 6.0 Standard) but it is not searchable which is not the desired result.  Is it correct that is not searchable because it the image has not gone through an OCR process and therefore can't be searched for terms, etc.?  Is there a software option -- short of trying to use Omnipage for every document -- that will let me use the network delivery scan functions and end up with a searchable pdf? I have looked at some Doculex products and recently at Docu-Track PDF-XChange but just don't have the technical knowledge to know if they will work.  The tech support people at the dealer that sold me the machine get glossy eyes when I try to get answers to this from them.

TIA