To this effect, the guiding head of the cutting wire is rotatingly mounted and controlled by, for example, digital control means, so that the cutting wire may take any desired inclination.

The head guiding is designed in such a way that during the head movement the relative position of the head and the information recording tracks on the disc is constant within a negligible range of tracking error.

The apparatus comprises a drive with a writing-reading head, a driving motor for rotating the disc and a guiding assembly for moving the head along a path.

A nose guide member (34) rotatably carrying an idler sprocket (34.1) is mounted to an elongate primary guide bar member (32) for reciprocal longitudinal movement relative thereto.

The guide unit (110) performs a first guidance about a guide point.

The guide tool includes a guide portion that includes a guide surface.

The guide member includes a guide housing and an elongated guide shaft.

At least one of said guide parts has a slotted guide for guiding the other guide part.

To this effect, the guiding head of the cutting wire is rotatingly mounted and controlled by, for example, digital control means, so that the cutting wire may take any desired inclination.

The travel guidance execution unit uses the guidance information in the guidance information storage unit to execute travel guidance.

The upper guiding device is formed by a physical guiding path comprising a guiding element which can be displaced along said guiding path.

The guide rail assembly includes a guide rod.

A system for providing integrated guidance for positioning a needle in a body has two levels of guidance: a coarse guidance and a fine guidance.

The guiding collar(s) and guiding cylinder extend forwards and each guiding collar can slide on the guiding cylinder associated therewith.

If the guide execution item has been selected, the guide unit (104) executes a voice guide correlated with the guide execution item.