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This article describes an arrangement for testing a document feeder as a separate subassembly by calibrating the registration sensors with an easily prepared template.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
70% of the total text.
Page 1 of 1
Document Feeder Registration Test Calibration
This article describes an arrangement for testing a document feeder as a
separate subassembly by calibrating the registration sensors with an easily
Functional testing of a document as a subassembly requires some sensing
means to provide a signal to the controller indicating whether paper registration is
within tolerances. Since several hundred sheets may be used to test a feeder, an
automatic controller is required.
Two analog registration sensors are positioned under the document glass, as
shown in Fig. l, and are supported by a bracket resting on parts of the scanning
apparatus. Registration sensors are positioned to sense copy sheets' overlap.
A calibration master which has two cut-outs, as shown in Fig. 2, is placed on
the document glass. The cut-outs line up with the sensors, and depth of the cut-
outs corresponds to the maximum allowed misregistration. The computer
records the analog output from the registration sensors and stores these values
for later comparison. The calibration master is then removed and the document
feeder is functionally tested.
During functional test, paper is fed through the document feeder. Each sheet
fed onto the glass is checked for proper registration. Once the paper is
positioned on the glass, the computer again reads the sensors. The new
readings are compared to the stored values. If the new values are greater than
the stored values, the paper is registered withi...