Compact interface module for a printing system

A sheet transfer device for transferring a sheet from a first sheet processing device to a second sheet processing device, the sheet transfer device comprising:

• a switch moveable between:
• a first position for directing sheets from a first transport path arranged for receiving sheets from the first sheet processing device onto a two-way transport path arranged for reversing a transport direction of the sheet;
• and
• a second position for directing sheets from the two-way transport path onto a second transport path arranged for feeding sheets to the second sheet processing device;
• a transport pinch actuatable in two opposing directions for reversing a transport direction of a sheet on the two-way transport path;
• when in use, the two-way transport path extends downward in a vertically extending free-hanging chamber wherein the sheet engaged by the transport pinch is allowed to hang freely under the influence of gravity,
• wherein:
• the transport pinch comprises:
• a pair of registering wheels for contacting a first side of the sheet;
• a pair of actuators for setting an angular velocity of each registering wheel.