Abstract: Bar feeder (1) comprising a guide channel (10) centred on an invariable guide axis (A-A), characterised in that the guide channel (10) is adjustable and is formed by an adjustable guide element which can define a guide channel with a constant centre (C) corresponding to a bar diameter comprised between a maximum bar diameter (DMax) in a first position (P1) and a minimum bar diameter (DMin) in a second position (P2) under the action of a device for adjusting the diameter of the guide channel (2).

Abstract: A filter unit, or more specifically, a filter box for a chip conveyor for conveying cutting chips that are produced in the operation of a machine tool, such as a lathe or the like. More specifically, the exemplary filter unit has at least one internally located brush that is used for removing different types of chips contained in a coolant fluid and/or cutting oil used in machine tools during metal working through mechanical brushing and jolting the surface of the filtration element(s) of the filter unit. A chip conveyor and a method of filtering cutting fluid in a filtering chip conveyor is also disclosed.