Method and device for resharpening knives used in cutting machines

A method to resharpen edges of knives of a wood cutting machine, in which the knives are fastened by releasable clamps in a rotatable cylindrical mounting support so that during operation the edges of the knives form a common circle, the method comprising moving said knifes to a functional position one after another by:

• loosening each clamp in the mounting support so an associated knife may be slidably moved therein,
• after said each clamp is loosened, slidingly advancing the associated knife to a functional position by an amount relative to the wear of the knife edge, and
• tightening said clamp to secure knife in the mounting support,
• after all of said knives are advanced, grinding the knife edges while rotating the mounting support, whereby the extent of grinding is preprogrammed in relation to the state of wear of a relevant area of the mounting support from which the knife edges protrude.

An apparatus for use in resharpening edges of knives of wood cutting machines in which the knives are fastened by releasable clamps in a rotatable cylindrical mounting support,

• the apparatus comprising a machine frame, rotational means for rotating the mounting support, grinding means for resharpening said edges and adjustment means for positioning the knives in a functional position,
• said rotational means carried by the machine frame and for engaging and rotating the mounting support while the knife edges are ground,
• said adjustment means including clamp engagement means to loosen and tighten said clamps, and knife positioning means for moving the knives to the functional position
• said grinding means carried by the machine frame and adapted for translatory movement along the knife edges which are to be ground,
• with said mounting support engaged by the rotational means, the adjustment means sequentially moving each knife to the functional position by:
• the clamp engagement means loosening each clamp so an associated knife may be slidably moved therein,
• after said each clamp is loosened the knife positioning means moving the associated knife to the functional position by an amount relative to the wear of the knife edge, and
• with the associated knife moved to the functional position, the clamp engagement means tightening said clamp to secure the advanced knife in the :mounting support,
• the adjustment means then moving a next knife until all of said knives are advanced,
• after all of said knives are advanced, the grinding means grinding the knife edges while said mounting support is rotated by the rotational means.