Abstract: In a hewing or cutting roll including a central roll part and at least one lateral roll part telescopically extractable in the axial direction of the roll, wherein the central roll part and the extractable roll part have each a connection site for a hydraulic cylinder piston unit, the hydraulic cylinder piston unit is arranged to be pivotable relative to the central roll part and/or the extractable roll part about at least two axes and, in particular, universally.

Abstract: In a hewing or cutting roll including a central roll part and at least one lateral roll part telescopically extractable in the axial direction of the roll, wherein the central roll part and the extractable roll part have each a connection site for a hydraulic cylinder piston unit, the hydraulic cylinder piston unit is arranged to be pivotable relative to the central roll part and/or the extractable roll part about at least two axes and, in particular, universally.

Abstract: A driving or mining machine includes a pivotable cantilever arm that is hinged so as to be pivotable in the height direction to a pivoting mechanism capable of being pivoted about a substantially vertical axis and on its free end carries rotationally mounted excavation tools, in particular cutter heads. It further includes a traveling mechanism and a frame carrying the traveling mechanism, on which frame a haulage device and a suction device as well as anchor boring and setting devices are arranged. The frame carrying the traveling mechanism on its side facing away from the cantilever arm behind the pivoting mechanism is designed as a lowered platform. The anchor boring and setting device is arranged substantially in the longitudinal center of the frame above the platform and pivotally mounted on a rollover whose pivot axis crosses the vertical axis of the pivoting mechanism.

Abstract: A driving or mining machine includes a pivotable cantilever arm that is hinged so as to be pivotable in the height direction to a pivoting mechanism capable of being pivoted about a substantially vertical axis and on its free end carries rotationally mounted excavation tools, in particular cutter heads. It further includes a traveling mechanism and a frame carrying the traveling mechanism, on which frame a haulage device and a suction device as well as anchor boring and setting devices are arranged. The frame carrying the traveling mechanism on its side facing away from the cantilever arm behind the pivoting mechanism is designed as a lowered platform. The anchor boring and setting device is arranged substantially in the longitudinal center of the frame above the platform and pivotally mounted on a rollover whose pivot axis crosses the vertical axis of the pivoting mechanism.

Abstract: A method and apparatus for controlling the movement of a universally swivellable cutting arm of a partial cut cutting machine of the kind including a first hydraulic drive for lifting and lowering the cutting arm in order to preselect the depth of cut and a further hydraulic drive for swivelling the cutting arm transversely relative to the direction of lifting movement and lowering movement, wherein the time interval elapsed for actuating one of the drives and/or the volumetric amount of pressurized fluid supplied to each of the drives is measured and wherein, in dependence on the desired preselected depth of cut and after having attained the time interval of actuating one drive required for the preselected depth of cut or after having attained the volumetric amount for the displacement in direction of the preselected depth of cut, supply of pressurized fluid to the first drive is closed and only the supply of pressurized fluid to the further drive is released.