Goods-to-person systems: bringing the shelf to the operator

The journey moves from the picker to the machine

Shuttle systems run vehicles along rack levels to retrieve totes, stacked-grid systems lift containers from a dense cube, and mobile rack units carry entire shelving bays to a station. In each case the operator remains at one point, presented with a container and told what to take from it. Because storage no longer needs aisles for people, density rises sharply, which is why these systems appear where floor area is scarce or expensive.

The station is now the process

With travel removed, everything depends on the seconds spent at the workstation: how clearly the item and quantity are indicated, whether the operator can put away and pick in the same visit, how the containers are presented, and whether the work sits in a comfortable reach band. Poorly designed stations waste the advantage the machinery just bought. They are also the point at which verification, weighing and labelling can be folded into the same movement rather than added later.

The machine's cycle sets the ceiling

An operator can only work as fast as containers arrive, so throughput depends on retrieval time, on how well the system buffers the next container while the current one is being worked, and on the sequence in which orders are released. In dense cube storage there is an additional effect: containers stored beneath others must be dug out, so the placement of fast lines near the top of the stack materially changes the rate. Suppliers quote station rates that assume all of this is tuned, which it will not be on the first day.

The format decides which products qualify

These systems suit small and medium items that fit a standard container, move in reasonable volumes and do not require special handling. Bulky goods, pallet lines, awkward shapes and products needing temperature or hazard segregation stay outside, which means the site keeps a conventional area alongside and has to consolidate orders that draw from both. Deciding where that boundary sits, and how mixed orders are joined, is a design question with a bigger effect on service than the choice of supplier.

Stock inside is stock behind a machine

When the system stops, its contents become inaccessible in a way that racking never is, and manual recovery is slow if it is possible at all. Sensible operations keep an outside buffer of the most critical lines, understand how long they can trade without the system, and hold maintenance arrangements that match that tolerance. That resilience question should be answered during selection, because it may favour several smaller modules over one large installation.

Frequently asked questions

Do these systems eliminate picking errors?

They reduce the class of error caused by going to the wrong place, since the system chooses the container. Taking the wrong item or the wrong quantity from a presented container remains possible, which is why stations usually add a scan or a weight check.

Can such a system be installed in an existing building?

Frequently yes, provided the floor can carry the load and there is sufficient height. Clear height, floor flatness, fire protection arrangements and access for maintenance are the usual constraints, and they should be assessed before the layout is designed around the equipment.