Patent US5519478A successfully refreshed from Google Patents.
US5519478A
Expired / Lapsed
US
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Fuser nip sheet basis weight detection system
Assignee: Xerox Corp
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Filing: 1994-11-25
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Granted: 1996-05-21
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Expires: 2014-11-25
Abstract
Abstract An apparatus in which sheet basis weight is determined as a function of a change in angular velocity of a roller defining a nip through which the sheet passes. The sheet basis weight is calculated in response to the change in angular velocity of the roll before and after the sheet enters the nip. In an electrophotographic printing machine, the change in angular velocity of the fuser roll or pressure roll may be used to calculate the sheet basis weight.
Inventors
- 👤 Michael A. Malachowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5029; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G2215/00; G03G2215/00362; G03G2215/00535; G03G2215/00717; G03G2215/00742
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
67 words
An apparatus for determining sheet basis weight, including: a rotatable member; a member positioned adjacent said rotatable member to define therewith a nip through which the sheet passes; and a device, operatively associated with said rotatable member, for generating a measurement of the sheet basis weight as a function of a change in angular velocity of said rotatable member in response to the sheet entering the nip.
Claim 2
Independent Claim
67 words
An apparatus for determining sheet basis weight, including: a rotatable member; a member positioned adjacent said rotatable member to define therewith a nip through which the sheet passes; and a device, operatively associated with said rotatable member, for generating a measurement of the sheet basis weight as a function of a change in angular velocity of said rotatable member in response to the sheet entering the nip.
Claim 3
Dependent Claim
66 words
An apparatus according to claim 1, wherein said device includes: a sensor, associated with said rotatable member, for detecting the angular velocity of said rotatable member; and a processing unit, in communication with said sensor, for calculating the sheet basis weight as a function of the change in angular velocity of said rotatable member detected by said sensor in response to the sheet entering the nip.
Claim 4
Dependent Claim
36 words
An apparatus according to claim 2, further including a motor coupled to said rotatable member, for rotating said rotatable member, said sensor detecting a change in speed of said motor and generating a signal indicative thereof.
Claim 5
Dependent Claim
14 words
An apparatus according to claim 3, wherein said member includes a second rotatable member.
Claim 6
Dependent Claim
30 words
An apparatus according to claim 4, further including a controller, associated with said sensor, for maintaining said motor at a selected speed in response to the signal from said sensor.
Claim 7
Dependent Claim
13 words
An apparatus according to claim 5, wherein said sensor includes a shaft encoder.
Claim 8
Dependent Claim
82 words
An electrophotographic printing machine of the type having a processing station and in which sheet basis weight is determined, wherein the improvement includes: a rotatable member; a member positioned adjacent said rotatable member to define therewith a nip through which the sheet passes; and a device, operatively associated with said rotatable member, for generating a measurement of the sheet basis weight as a function of a change in angular velocity of said rotatable member in response to the sheet entering the nip.
Claim 9
Dependent Claim
82 words
An electrophotographic printing machine of the type having a processing station and in which sheet basis weight is determined, wherein the improvement includes: a rotatable member; a member positioned adjacent said rotatable member to define therewith a nip through which the sheet passes; and a device, operatively associated with said rotatable member, for generating a measurement of the sheet basis weight as a function of a change in angular velocity of said rotatable member in response to the sheet entering the nip.
Claim 10
Dependent Claim
67 words
A printing machine according to claim 7, wherein said device includes: a sensor, associated with said rotatable member, for detecting the angular velocity of said rotatable member; and a processing unit, in communication with said sensor, for calculating the sheet basis weight as a function of the change in angular velocity of said rotatable member detected by said sensor in response to the sheet entering the nip.
Claim 11
Dependent Claim
37 words
A printing machine according to claim 8, further including a motor coupled to said rotatable member, for rotating said rotatable member, said sensor detecting a change in speed of said motor and generating a signal indicative thereof.
Claim 12
Dependent Claim
15 words
A printing machine according to claim 9, wherein said member includes a second rotatable member.
Claim 13
Dependent Claim
26 words
A printing machine according to claim 10, wherein: said first mentioned rotatable member includes a fuser roll; and said second rotatable member includes a pressure roll.
Claim 14
Dependent Claim
31 words
A printing machine according to claim 10, further including a controller, associated with said sensor, for maintaining said motor at a selected speed in response to the signal from said sensor.
Claim 15
Dependent Claim
14 words
A printing machine according to claim 12, wherein said sensor includes a shaft encoder.
Claim 16
Dependent Claim
24 words
A printing machine according to claim 12, wherein said controller regulates the processing station as a function of the signal received from said sensor.
Claim 17
Independent Claim
67 words
A method of detecting sheet basis weight of a copy sheet in a printing machine, including: advancing a sheet to a nip defined by at least one rotating member; measuring a change in angular velocity of the rotating member in response to the sheet entering the nip; and calculating the sheet basis weight as a function of the change in angular velocity measured in said measuring step.
Claim 18
Independent Claim
67 words
A method of detecting sheet basis weight of a copy sheet in a printing machine, including: advancing a sheet to a nip defined by at least one rotating member; measuring a change in angular velocity of the rotating member in response to the sheet entering the nip; and calculating the sheet basis weight as a function of the change in angular velocity measured in said measuring step.
Claim 19
Dependent Claim
23 words
A method according to claim 15, wherein said measuring step includes detecting a change in speed of a motor driving the rotating member.
Claim 20
Dependent Claim
30 words
A method according to claim 16, further including controlling the motor to maintain a selected speed in response to said detecting step detecting the change in speed of the motor.
Claim 21
Dependent Claim
32 words
A method according to claim 17, wherein said controlling step regulates a processing station in the printing machine in response to said detecting step detecting the change in speed of the motor.
References Cited (Backward Citations)
US4937460A
Cited
US5138178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-21 | 1999-11-20 | 2000-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-21 | 2003-11-20 | 2004-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-21 | 2007-11-20 | 2008-05-21 | $7700.00 | Window Closed / Lapsed |