Paper anti-skew device
AssigneeXerox Corporation
InventorJanusz W. Kupisiewicz
Life of this patent
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Abstract
A paper anti-skew device for maintaining alignment and preventing skewing of sheets fed from a stack into a copy sheet mass in an electrostatic copying machine for producing copies of documents. Sheets are fed from lead edge by a top feeding pneumatic device in seriatim. The anti-skew device rests on top of the stack of sheets along the trailing edge of the stack and is longitudinally coextensive with the trailing edge thereof. Corner portions extend from the longitudinal portion of the member at an angle of 90.degree. for a predetermined distance to maintain alignment of the trailing corners of the topmost sheets as they are fed and which may stick and skew relative to the direction of the copy sheet path in the absence of the anti-skew device.
Claims8
In an electrostatographic copying machine in which copies of documents are reproduced on copy sheets which are fed from a stack by a top feeding device along a copy sheet path, an improved sheet anti-skew device for maintaining alignment of the edges of the topmost sheets of the stack comprising:
- an elongated member positioned to rest on a top of a stack of sheets to be fed, said member longitudinally extending along the trailing edge of said stack, said member having corner portions extending vertically at an angle of 90.degree. from the longitudinal extent of the member for a predetermined distance to receive corners of the topmost sheets to prevent the skewing thereof as they are fed from the top of said stack.
In an electrostatographic copying machine in which copies of documents are reproduced on copy sheets which are fed from a stack by a top feeding device along a copy sheet path, an improved sheet anti-skew device for maintaining alignment of the edges of the topmost sheets of the stack comprising:
- and elongated member positioned to rest on top of a stack of sheets to be fed, said member longitudinally extending along the trailing edge of said stack, said member having corner portions extending vertically at an angle of 90.degree. from the longitudinal extent of the member for a predetermined distance to receive corners of the topmost sheets to prevent skewing thereof as they are fed from the top of a stack,
- wherein said corner portions are beveled to facilitate placement of the member on the top of the stack of sheets.
In a sheet-feeding device in which sheets of rectangular shape are arranged in a stack from which the uppermost sheet is advanced forwardly during a feed cycle by engagement of the top sheet of the stack adjacent the forward edge, a bracket adapted to be positioned on top of the stack across the rearward edge in which the bracket consists essentially of an integral member having a horizontally disposed top wall dimensioned to have a length to rest only on a small segment of the top of the stack across the rearward edge portion, a back wall which depends perpendicularly from the rearward edge of the top wall for a short distance to engage the upper portion of the stack across the back side, and side walls which extend perpendicularly from the top and back walls and are spaced by an amount corresponding to the length of the sheets in the stack to embrace the upper rearward end portions of the side walls of the stack.
A method for preventing paper jamming of a machine by paper plates fed from the top of a stack forwardly into the machine in response to engagement of the top sheet in the stack adjacent its forward edge during the paper feeding cycle comprising positioning onto the rearward end portion of the stack on integral free-floating bracket having a top wall portion which rests on only a small segment of the top of the stack across the rearward edge portion, a back wall which depends perpendicularly for a short distance from the rearward edge of the top wall in position to engage the back side of the stack across the upper edge portion, and side walls which are spaced one from the other by an amount corresponding to the length of the paper in the stack to engage the upper rearward corners of the stack whereby, in response to forward displacement of the uppermost sheet in the stack in feeding relation, the bracket is brought into engagement to effect realignment of any misaligned sheets and to prevent misalignment of uppermost sheets in the stack.
Dependencies are inferred from the claim text.