Guide for a hewing machine mounted on a conveyor

An assembly comprising a hewing machine, a conveyor, a guide rail for the hewing machine, and a chain disposed in a chain passage formed in the guide rail, said hewing machine being mounted movably on the conveyor by the guide rail and including a guide shoe guided by the guide rail and a chain wheel, said conveyor including a conveyor channel and, on the filling side, a mounting plate on which the guide rail is mounted, said guide rail defining an engagement groove in its roof side for the chain wheel of the hewing machine, said guide rail defining openings in its floor side for discharge of material to be conveyed which is disposed in the chain passage, and said chain comprising long horizontal members and short vertical members, wherein the guide rail is of a box-shaped configuration and is of substantially rectangular cross-section, all four sides of the guide rail are engaged by the guide shoe of the hewing machine and serve as guide surfaces for the guide shoe of the hewing machine, on the filling side the guide rail has a lower portion and an upper portion in the form of an overhead bar which is screwed to the lower portion, and the vertical members of the chain disposed in the chain passage project into the engagement groove.