Abstract: An installation for sorting out reject slugs out of the slug channel of an automatic coining machine with a slug control mechanism, whereby the reduction of the reaction time for the rejection of slugs to be sorted out permits a considerable increase of the number of coining strokes of the automatic coining machine, without the need for a further additional intermediate storage of slugs. The reject channel for rejected slugs is thereby kept closed by shaped members in the manner of shutters and is opened up in case of need whereby also the desired dimensions for the slugs are determined by the shaped members. Such a slug control mechanism is needed in the slug channel of an automatic coining machine in order to separate good slugs from reject slugs.