Modular printing apparatus with a removable, box-shaped module

A modular printing apparatus has a printing device with an inkjet print head and a box-shaped module that urges items toward the print head, for printing thereon. In an operating mode, the box-shaped module is inserted into the printing apparatus via a mechanical connection and can be removed from the printing apparatus in a service mode. A triggering mechanism acts on a locking mechanism with first and second force components that couple the locking mechanism and the mechanical connection element to one another in the operating mode to lock the box-shaped module in a bay of the printing apparatus at the printing apparatus. The second force component acts in an opposite direction in the service mode, to disengage the locking mechanism and the mechanical connection element to unlock and remove the box-shaped module.