Sheet edge detector
AssigneeXerox Corporation
InventorsBarbara A. Sampath, Richard C. Schenk
Life of this patent
Estimating the term…
Abstract
An apparatus which determines the location of an edge of an advancing sheet and discriminates between a hole therein. After the leading edge of the sheet is detected and the sheet has moved a first predetermined distance, the absence or presence of the sheet is sensed for a second predetermined distance. If the sheet is not detected as it moves the second predetermined distance, the control logic indicates that the trailing edge has been detected. In the event the sheet is sensed, the control logic indicates that a hole has been detected and the process is repeated to locate the trailing edge.
Claims17
An apparatus for determining the location of an edge of a sheet, including:
- means for advancing the sheet;
- and
- means for distinguishing between the edge of the sheet and a hole in the marginal region thereof.
An electrophotographic printing machine of the type in which it is necessary to discriminate between an edge of the copy sheet and a hole therein, wherein the improvement includes:
- means for advancing the sheet;
- and
- means for distinguishing between the edge of the sheet and a hole in the marginal region thereof.
A method of determining the edge of a sheet, including the steps of:
- advancing the sheet;
- and
- distinguishing between the edge of the sheet and a hole in the marginal region thereof.
Dependencies are inferred from the claim text.