Device for separating blanks from a sheet of cut blanks
AssigneeBobst SA
InventorCharly Varidel
Life of this patent
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AssigneeBobst SA
InventorCharly Varidel
Estimating the term…
A device for removing blanks which have been cut into a sheet of paper or cardboard and are separated from each other by intermediate strips and are surrounded by a crosswise frontal and a crosswise back strip and two lengthwise side strips. The device includes a lower tool having a grid having apertures corresponding to the size and shape of each of the blanks with bars for supporting the intermediate strips, the lengthwise side strips and front and back crosswise strips, and an upper tool having pushing elements of a shape similar to the blank for pushing the blanks through the apertures of the lower tool and also having pressing devices for holding the intermediate and side strips against the respective bars of the lower tool during the step of separating. To prevent the catching of the strips on the lower tool during a subsequent removal of the residual sheet, a portion of the longitudinally extending pressing devices is provided with suction ports to cause a lifting of the portion of the residual sheet as the upper tool is moved upward subsequent to the separation of blanks from the residual sheet and during the step of removing the residual sheet from the device.
In a device for separating blanks which were cut into a sheet of material selected from a group consisting of paper and cardboard, said sheet having a frontal strip connecting two lengthwise side strips with the blanks disposed therebetween, said blanks being separated from each other by lengthwise and transverse intermediate strips, said intermediate strips, side strips and frontal strips forming a residual sheet once the blanks are removed therefrom, said device comprising a lower tool in the shape of a grid having lengthwise bars and crosswise bars disposed in a pattern to form apertures in the location, shape and size of the blanks, an upper tool being mounted for movement relative to the lower tool with a plurality of pushers having a contour slightly smaller than that of the apertures for pushing the blanks into the apertures of the lower tool, as the upper tool moves toward the lower tool and pressing means positioned between the pushers for holding the lengthwise side strips and the intermediate strips against the respective bars of the grid as the pushers force the blanks through the apertures, the improvement comprising at least part of the pressing means located above the lengthwise bars having exhaust ports connected to a source of partial vacuum so that as the upper tool is being lifted upward, at least an upstream part of the residual sheet is raised with the upper tool away from the lower tool to enable removing the residual sheet from the device.
Dependencies are inferred from the claim text.