Paper path signature analysis apparatus
First Claim
1. An apparatus for monitoring the velocity of a sheet handling device for advancing individual cut sheets, comprising:
- means for advancing individual cut sheets independently of and relative to one another;
means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a signal indicative thereof; and
means for comparing the signal from said measuring means with a reference signal to generate an error signal.
4 Assignments
0 Petitions
Accused Products
Abstract
A sheet path velocity profile signature analysis apparatus which utilizes output from various idler rolls throughout the machine paper path to detect abnormalities. The constantly monitored and instantaneous velocity readings are compared with a base line velocity signature established at the factory. If the constantly monitored velocity profile is not within the pre-established operating parameters as set at the factory, automatic machine adjustment procedures are initiated and/or automatic service alerts are issued. The ability to constantly monitor the velocity profile throughout the machine enables preventative maintenance to occur and worn drive rolls, idler rolls and other transport devices can be replaced before catastrophic failure.
56 Citations
19 Claims
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1. An apparatus for monitoring the velocity of a sheet handling device for advancing individual cut sheets, comprising:
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means for advancing individual cut sheets independently of and relative to one another; means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a signal indicative thereof; and means for comparing the signal from said measuring means with a reference signal to generate an error signal. - View Dependent Claims (2, 3)
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4. An apparatus for monitoring the velocity of a sheet handling device for advancing individual cut sheets, comprising:
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means for advancing individual cut sheets independently from one another, wherein each said advancing means comprises a drive roller and an idler roller in frictional contact with said drive roller defining a nip therebetween; means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a velocity profile signal indicative thereof; means for comparing the signal from said measuring means with a reference signal to generate an error signal; and means, in response to the error signal, for displaying a fault message. - View Dependent Claims (5, 6)
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7. An apparatus for monitoring the velocity of a sheet handling device for advancing individual cut sheets, comprising:
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means for advancing individual cut sheets independently of and relative to one another, each said advancing means comprising a drive roller, and an idler roller in frictional contact with said drive roller defining a nip therebetween; means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a velocity profile signal indicative thereof; and means for comparing the signal from said measuring means with a reference signal to generate an error signal. - View Dependent Claims (8, 9)
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10. An electrophotographic printing machine of the type for advancing individual cut sheets through the machine, wherein the velocity of the sheet handling device is monitored comprising:
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means for advancing individual cut sheets independently of and relative to one another; means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a signal indicative thereof; and means for comparing the signal from said measuring means with a reference signal to generate an error signal. - View Dependent Claims (11, 12)
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13. An electrophotographic printing machine of the type for advancing individual cut sheets through the machine, wherein the velocity of the sheet handling device is monitored comprising:
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means for advancing individual cut sheets independently from one another, wherein each said advancing means comprises a drive roller and an idler roller in frictional contact with said drive roller defining a nip therebetween; means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a velocity profile signal indicative thereof; means for comparing the signal from said measuring means with a reference signal to generate an error signal; and means, in response to the error signal, for displaying a fault message. - View Dependent Claims (14, 15)
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16. An electrophotographic printing machine of the type for advancing individual cut sheets through the machine, wherein the velocity of the sheet handling device is monitored comprising:
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means for advancing individual cut sheets independently of and relative to one another each said advancing means comprising a drive roller, and an idler roller in frictional contact with said drive roller defining a nip therebetween; means for measuring a velocity profile of said advancing means as individual sheets are advanced thereby and generating a velocity profile signal indicative thereof; and means for comparing the signal from said measuring means with a reference signal to generate an error signal. - View Dependent Claims (17, 18, 19)
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Specification