A device comprising a table provided with guide surfaces and a plate movable over the table as well as a mechanism for blocking the plate on the table.

摘要

A plate is locked in situ on a table that has a guide for controlling the movement of the plate in a predetermined direction. A pair of members are moved between a first position where they are applied to fixedly connect the plate to the guide and a rest position where the plate can be moved. Ramps are inclined relative to the predetermined direction of the guide. The ramps and member are positioned so the member is movable between the first and rest positions along the ramps. The ramps cooperate with the member and are displaceable substantially in the predetermined direction as the plate moves on the guide.