Device and process for separating a sheet article from a stack
AssigneeGiesecke & Devrient GmbH
InventorKarl Leuthold
Life of this patent
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Abstract
In an apparatus for separating sheet material from a stack, the latter rests on a movable pressure plate, by adapted to feed the stack to a withdrawal device. The pressure under which the stack is urged against the withdrawal device is dependent upon the density of the stack. For determining the density, the apparatus comprises a density sensor which determines the density of the stack continuously during the separation process at least in the region of the withdrawal device.
Claims12
An apparatus for separating sheet material from a stack, including a movable pressure plate on which the stack rests, said movable pressure plate being arranged to feed the stack to a withdrawal device arranged to separate and withdraw an uppermost sheet from the stack, wherein said apparatus comprises:
- a density sensor arranged to continuously determine a density of at least a portion of said stack during separation of the uppermost sheet from said stack;
- and
- a controller arranged to control a distance between said pressure plate and said withdrawal device in accordance with said density such that said stack is urged against said withdrawal device under a constant contact pressure during said separation of said uppermost sheet from said stack.
A method of separating sheet material from a stack, wherein the stack is placed on a pressure plate, the stack is fed by the pressure plate to a withdrawal device, and the withdrawal device separates an uppermost sheet from the stack, comprising the steps of:
- continuously determining a density of at least a portion of the stack during separation of the uppermost sheet from the stack;
- adjusting a distance between the pressure plate and the withdrawal device in accordance with said density, such that the stack is urged against the withdrawal device under a constant contact pressure during said separation of the uppermost sheet from the stack.
Dependencies are inferred from the claim text.