[nmridul]

I was wondering if the robots have to really carry the whole shelf ?

The shelves could be modified to be like automatic wending machines. The robots could just go to the shelf and the shelf will dispose the correct item to that robot. Then the robot goes to the next shelf for that order and collect all the items required for the order from different shelves and return to the packer.

The packer need to only arrange the items in the final box.

[Animats]

There are systems like that, but they're much more expensive than the Kiva system. Kiva just needs a standard, simple mobile robot base and a lot of sheet metal shelving units. It's reliable, because no one robot is essential; if one fails, another one takes over. All you need is a big warehouse with a flat floor; there's not a lot of custom mechanical engineering of conveyors and tracks.

The Kiva system is low-maintenance and low-skill. All you need on-site is someone to replace batteries and tires and clean the things; anything more than that, just ship the robots back to Kiva HQ in Massachusetts. No need for any on site engineering talent or on call maintenance.

Dispensing racks for picking systems are complex, expensive, and have single points of failure for each item. They're essentially huge vending machines. They do exist, though.[1]

Amazon has an R&D program under way to automate the picking process where the Kiva shelf unit reaches a human. They have a competition for robot picking.[2] The prize is $26,000 for a solution that will save Amazon billions.

[1] http://www.ssi-schaefer.de/en/conveying-and-picking/automati... [2] http://amazonpickingchallenge.org/

[Zombieball]

My guess is though this is entirely possible it is far too expensive to modify all the shelves to have this behaviour when you have a 1.2M sqft. facility.