Abstract: A tamp including a body and a tamping face carried by a base of the tamp, the base and body being arranged for relative movement in an axial direction during a tamping operation to compress and expand under action of a bias element, wherein the tamp includes a rotation mechanism to translate the relative axial movement of the base and body into rotational movement of the base. The invention also relates to a portafilter holder for positioning a portafilter under a tamping unit of a coffee grinding machine, for receipt of the coffee grounds, the portafilter holder including a dock to receive the portafilter and a retention member to hold the portafilter in the dock.

Abstract: A machine with a grinder, a grind chute for delivering coffee grounds along a flow path and into a portafilter fitted to the machine, and a tamping unit with a tamping mechanism for pressing the coffee grounds held by the portafilter into a puck, wherein the tamping mechanism includes a linkage connected to a tamp, the linkage being arranged to press a face of the tamp in an axial direction with respect of the portafilter during a tamping operation, and wherein the linkage returns the tamp to a rest position where the tamp face is moved laterally, out of the flow path. The invention also relates to a machine for delivering coffee grounds to a portafilter, a tamping mechanism and a coffee grinding machine.