Try this command for using acrobat reader :
AcroRd32.exe /t path printername drivername portname
- Initiates Acrobat Reader, prints a file while suppressing the Acrobat print dialog box, then terminates Reader.
The four parameters of the /t option evaluate to path, printername, drivername, and portname (all strings).
printername - The name of your printer.
drivername - Your printer driver's name. Whatever appears in the Driver Used box when you view your printer's properties.
portname - The printer's port. portname cannot contain any "/" characters; if it does, output is routed to the default port for that printer.
If using Acrobat, substitute Acrobat.exe in place of AcroRd32.exe in the command lines.
Charlize