A drive gear of a drum-cutter mining machine engages a rack device extending along the working side of a face conveyor to propel the mining machine along a mine face. Spanning each joint between conveyor tray sections is a bridging rack segment with leg extensions interlocked with recesses formed in extended end members of non-bridging rack segments each of which extends along a single conveyor tray section and is secured thereto by bolts. Rack teeth are formed by spaced-apart pin members carrie...

In order to overcome problems associated with drum cutter-loader mining machines having a cutting drum mounted at one or both ends of the machine on pivotable support arms and further having cutting drum drive motors positioned outside of the machine body, there is provided a unique support arm system for adjusting the height of the cutting drums and their associated drive motors which neither reduces the debris pass-through cross-section of the machine bridge nor impairs the height adjustabilit...

A coal mining machine movable between the coal seam and a conveyor, which by means of mining tools cuts the coal seam in front of the machine and which by means of a driving sprocket wheel engages a chain substantially parallel to the conveyor while a guiding rail is provided adjacent the mining machine which guiding rail has an inner substantially cylindrical surface with a longitudinal slot having a width at least wide enough to permit insertion of a chain into the guiding rail, said chain bei...

A screw-type cutter drum is provided having helical ribs on the drum body with cutter picks on the ribs and on the end of the drum. The cutter picks at the end of the drum are arranged in sets spaced apart to coincide with the ends of the ribs and the cutter picks of each set are equally spaced apart angularly and placed at different radial distances from the axis which decrease in the direction of rotation.

A drum cutter mining machine includes a machine frame with a winch having a drive wheel to engage a rack or chain which extends along the path of travel by the mining machine to propel the machine along a mine face. The mining machine is made up of discrete units which include a machine body and machine housings joined to opposite sides of the machine body. The winch is either coupled through a drive train with a feed drive motor or coupled to the drive motor for cutter drums. The machine housin...

A drum cutter includes a machine body having at the opposed ends, pivot shafts extending parallel to the mine floor at right angles to the direction of travel by the machine body along a coal face. Two support arms each include two laterally-spaced bores at one end thereof to selectively receive a projected portion of a pivot shaft extending toward the mine face. A lever is mounted onto each of the support arms adjacent the bores in the end thereof. A cutter drum projects from the free ends of t...

A drum cutter-loader machine includes discrete units joined together by tie bolts extending transversely to the direction of advancing movement along a face conveyor. The units in succession from the stow side to the working side include a gantry casing supporting winch drive motors and straddling the face conveyor, a transmission box, a winch casing and casing carrying actuators coupled to arms carried by pivots at opposite ends of the winch casing. The arms carry cutter drums driven by motors ...

Layered composite materials which comprises a substrate made from a thermoplastic polymer, and comprise an intermediate layer arranged thereupon and a decorative layer applied to the intermediate layer, where the decorative layer is composed of a chromed metal. A heat-cured layer may moreover be applied to the decorative layer. Layered composite materials of this type are suitable, inter alia, as reflecting or insulating parts of household devices or of moldings in the electrical, construction o...

The temperature (T) of a metal (1) can be influenced directly or indirectly by at least one actuator (2) which is actuated in accordance with a control variable (S). The control variable (S) and starting values (T.sub.A, p1.sub.A, p2.sub.A) for a temperature of the metal (1) and phase proportions in which the metal (1) is at least in a first phase or a second phase, respectively, are predetermined for a material model (5). A heat conduction equation and a transformation equation are solved in re...

The transport apparatus has a device for determining the transport speed of a tape-type medium. A linear array sensor is provided, which extends along the transport direction. Furthermore, means are provided in order to image a region of the medium onto the linear array sensor. A signal processing circuit connected to the linear array sensor determines the transport speed of the medium from the output signals of the linear array sensor.