Separator page

I have application which create large number of pdf files, I have to print many of the files.

I can lpr of FTP the files to the printer.

When I came to the printer I have a stack of pages.  Manual separation between the jobs takes time and errors.

I like to add separator page for each jobs, which mean I am looking for pdf blank page with instruction to the printer “take the page form a different tray”, I will add it to each job or submit it automatically between the jobs.

Any idea will be welcome.