| 摘要 |
A method of horizontally and vertically guiding a cutter advance mechanism involves adjusting and fixing each individual cutter plank of a plurality of cutter planks for a radial change of direction with respect to the apparatus and by guiding the individual cutter planks in the circumferential direction during its advance. The individual planks are provided with a tip which is pivotally attached to its front portion. Wedge surfaces which may be deployed are provided in the vicinities of the front and rear ends of the planks so as to engage the support frame. Two additional wedge surfaces are provided at side surfaces of the central plank, others of the cutter planks, are provided with a further wedge surface at respective sides thereof facing away from the central plank.
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