Here are some of the printer options that suits your requirement.
HP LaserJet Pro MFP M128fn Printer
This model has the ADF functionality. Being a laser machine, it has the loading tray functionality. Apart from that it also has the auto duplex feature too. Printing speed is 35ADF a time. So it is kind of time efficient. You can also send the print from the mobile. The printer has the premium price of 17,279.00 Rs available through Amazon.
Epson M200 All-in-one Inkjet Printer
EPSON's M200 has 30ADF prints a time capacity. It has loading tray and allows both black and white and color option. System also has the autoduplex option. It also has the scanner feature. Along with the fax machine, which you may not need but it does have it. The printer has the price of 12,355 Rs. available through Amazon.
Samsung M2071W WiFi Multi Function Laser Printer
This is another printer from Samsung that suits your requirement. It has the 20 pages per minute output capacity. The ADF feature here comes with Wifi support. It can also be used as scanner and fax machine. In short all in one document printer. It has price of 11,000 Rs on Amazon.
These three seems to be fitting more to the requirement description that you have asked for. Depending on your budget you can get the higher priced printers that suits your need. But the above printers are priced under 20K.