Device for stripping waste from a sheet die cut on a platen press
AssigneeJ. Bobst & Fils, S.A.
InventorMarcel Yerly
Life of this patent
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Abstract
A device designed for stripping waste from a sheet, which has been die cut by means of a platen press. The device includes two lateral frames, a fixed upper part or plate in which stripping tools are fixed, a lower movable supporting plate with apertures, which have the outline corresponding to the outlines of the waste to be removed, means for conveying a sheet between the upper and lower plates which means consist of gripper bars fitted between two endless chains running within the lateral frame members, and means for raising a portion of the means for conveying during the movement of the lower movable supporting plate.
Claims11
A platen press including a station having a vertically movable lower part, a cooperating upper part, conveying chains adjacent opposed side edges of said upper and lower parts, a gripper bar supported at its ends by said chains and having means for holding a sheet in a position between said parts, chain support guides underlying each of said chains and supporting said chains in said press, each of said chain support guides having ends and means for moving at least one end of each of said chain support guides toward and away from said upper part as said movable lower part moves toward and away from said upper part.
In a waste stripping assembly for stripping waste from a die cut sheet, said assembly including a pair of side frames, a fixed upper part having a plate and having stripping tools carried on said plate, a movable lower part carrying a plate with apertures corresponding to the outlines of the waste and movable in the direction of said upper part, sheet conveying means movable intermittently between said plates and having gripper means to pull a sheet to be stripped into the space between said plates, the improvement comprising separate means mounted in said side frames engaging said sheet conveying means and moving said sheet conveying means in the direction of said upper part during movement of said lower part toward said upper part.
A waste stripping assembly for stripping waste from a die cut sheet comprising a pair of side frames, an upper part fixed to said side frames and having stripping tools extending downwardly therefrom, a movable lower part having means defining apertures corresponding to the outlines of the waste to be stripped from the sheet, said stripping tools being positioned in relative congruence to said apertures, means moving said lower part toward and away from said fixed upper part in order to cause waste to be stripped from a sheet positioned therebetween and forced through said apertures, a pair of intermittently movable endless chains carried on said side frames, at least one gripper bar extending between said chains and connected therewith and having gripping fingers positioned thereon to grip a sheet and move it into position between said upper and lower parts, a guide rail underlying each of said chains in the area adjacent said parts and providing support for said chains, and means raising each of said guide rails having ends and lowering said guide rails as said lower part is raised and lowered relative to said fixed upper part.
Dependencies are inferred from the claim text.