Abstract: In order to improve a stencil holder for stencils, preferably for screen printing, comprising a frame having four frame supports, at least two rows of tensioning elements acting on corresponding rows of fixing points of the stencil, these rows being arranged on the frame and located opposite one another and at least one of these rows being movable in a first tensioning direction extending transversely to the rows for tensioning the stencil, such that this is constructed in as simple a manner as possible and allows as optimum a tensioning of the stencil as possible it is suggested that the tensioning elements of the movable row be guided for movement in the direction of the tensioning direction by a plurality of guide elements, that with each guide element at least one tensioning element associated therewith be movable independently of the respectively other tensioning elements, that the guide elements for each row of tensioning elements be arranged on a guide rail extending along the respective row and that t

Abstract: In order to improve a stencil holder for stencils made of metal films, preferably for screen printing, comprising a frame, at least two stencil receiving means arranged on the frame and detachably holding the stencil and a stencil tensioning device, with which the stencil can be tensioned in at least a first tensioning direction, such that the stencil can be tensioned as evenly as possible, it is suggested that the stencil have holding strips extending on from a stencil section, that these holding strips extend at the most over the respective length of an edge of the stencil section in the respective longitudinal direction thereof, that each holding strip be detachably securable on a respective stencil receiving means and that the stencil be tensionable in a first tensioning direction and a second tensioning direction extending transversely to the first by means of the stencil tensioning device acting on the stencil receiving means.

Abstract: A conveyor belt support maintains a conveyor belt in a central position. Support rollers for the conveyor belt are provided. Additionally, an underside, edge portion of the conveyor belt acts on at least one conical alignment roller that extends transversely to a longitudinal direction of the conveyor belt, and acts to hold the conveyor belt in the central position. The rollers are supported by a rotary frame that is pivotable relative to a stationary base frame when the conveyor belt shifts sideways out of the central position. A hydraulic drive is provided for pivoting the rotary frame when the conveyor belt shift sideways. Two hydraulic pumps are provided, each driven by one of the alignment rollers to provide a pressurized hydraulic fluid to the hydraulic drive via a two-pressure valve. One of the pumps is driven with a rotational speed that depends on the amount of shifting of the conveyor belt.

Abstract: A valve 1 for controlling a fluid medium flowing under pressure comprises an inlet opening 6 and an outlet opening 12 as well as an inlet member 4 having the medium flowing axially therethrough and a sleeve-shaped control member 13 axially displaceable between a closed and an open position relative to the inlet member 4, whereby in the closed position the outlet opening 12 is closed and in the open position the outlet opening 12 is opened. In addition, a first radially projecting, elastic sealing ring 24b is provided and a first annular sealing edge 25 which is adapted to be pressed sealingly against the first sealing ring 24b in a closed position of the control member 13.