Bison-werke Bahre & Greten Gmbh & Co Kg

Kurt Fischer

Helmut Weiner

A grinding machine and method for flat, board-shaped workpieces, especially for particle-board materials, fiber materials, veneer materials, and mineral materials, utilizing at least one continuous belt unit having a grinding belt that is supported upon rollers, a counterpressure element, and means for adjustable spacing the counterpressure element relative to the grinding belt for forming a gap corresponding to the thickness of the workpieces being ground therebetween is improved through the further utilization of support means for maintaining the counterpressure element in a substantially plane-parallel orientation relevant to the grinding belt during grinding. In accordance with a preferred embodiment of the grinding machine, the counterpressure element is a backing roller to which a variable pressure is applied by a pneumatic piston-cylinder unit. In accordance with the method aspect of the invention, the grinding is performed prior to full setting of the bonding agent, whereby the maintaining of the substantially plane-parallel orientation of the grinding belt and counterpressure element is of particular significance.

Grinding machine and method for flat, board-shaped workpieces

A belt grinding machine is described for the grinding of chipboard, fibreboard, faced board for similar boards in which the upper part of the housing can be raised and lowered relative to the lower part of the housing by a lifting device for adaptation to different board thicknesses. Spaced apart distance pieces or spacers are provided between the two parts of the housing to enable the basic board thickness to be selected. In order to ensure that boards of widely varying thicknesses can be machined with a grinding accuracy which meets the highest requirements, even when the boards that are supplied have relatively large thickness variations, a vertically steplessly adjustable clamping element, which is acted on by a pressure fluid, is associated with each spacer. In the lowered state of the upper part of the housing the clamping device clamps the upper part to the lower part with the spacers being trapped therebetween. The pressure of the pressure fluid supplied to the clamping devices is adjustable.

Belt grinding machine

A wide belt grinding machine which is provided with a control member to reverse, in the case of power failure, the pressure force effective on a piston which relieves the tension on an endless abrasive belt via a tensioning roll.

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Bad Munder, Germany

Kurt Fischer