Information
-
Patent Grant
-
6347197
-
Patent Number
6,347,197
-
Date Filed
Friday, October 20, 200024 years ago
-
Date Issued
Tuesday, February 12, 200222 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- McArdle, Jr.; John J.
- Sanderson; Michael T.
- Talyor; Todd T.
-
CPC
-
US Classifications
Field of Search
US
- 399 24
- 399 31
- 399 33
- 399 67
-
International Classifications
-
Abstract
An oil web system and method for operating a fuser system of an imaging apparatus in which remaining life of the oil web is determined from data on drive mechanism activation and data on web advancement lengths. A warning signal can be issued upon a predetermined remaining length being reached, and the machine can be disabled upon exhaustion of the web life.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electrophotographic imaging apparatus, and more particularly to a fuser oiling apparatus life detection system in an electrophotographic imaging apparatus.
2. Description of the Related Art
In the electrophotographic process commonly used in imaging apparatus such as laser printers, an electrostatic image is created upon a photosensitive member such as a roll or belt. Visible electroscopic marking particles, commonly referred to as toner, are applied to the electrostatic image on the photosensitive material. Thereafter, the toner is transferred to the desired media, which may include paper, transparency sheets or the like.
Until the toner is fixed by the application of heat, the toner image applied to the media is not permanent. During fixing, the toner is elevated in temperature sufficiently to cause constituents of the toner to become tacky, and flow into the pores or interstices between fibers of the media. Upon cooling, the toner again solidifies, causing the toner to adhere to the media. Pressure may be applied to enhance the flow of the toner, and thereby improve the subsequent bonding of the toner to the media.
An approach used commonly for thermally fixing the electroscopic toner images is to pass the media, with the toner image thereon, through a nip formed by opposed rolls, at least one of which is heated either internally or externally such that the roll surface is at an elevated temperature. The heated roll, referred to as a fuser roll, contacts the toner image, thereby heating the image within the nip. Under some operating conditions, the tackiness of the toner upon heating can cause the media to adhere to the fuser roll and/or may cause a build up of toner on the fuser roll. By controlling the heat transfer to the toner, transfer of toner to the fuser roll can be minimized. In a duplex imaging apparatus, wherein both sides of the media may be printed, toner transfer or media sticking problems may be enhanced. Further, toner may be transferred to the backing roll of the fuser roll couple, and transferred thereafter elsewhere in the apparatus. The presence of wayward toner particles in the imaging apparatus can degrade the quality of the printed sheets.
In fusers of the type described, it is known to employ an apparatus for applying a release fluid to the surface of the fuser roll. The release fluid creates a weak boundary between the heated roll and the toner, thereby substantially minimizing the offset of toner to the fuser roll, which occurs when the cohesive forces in the toner mass are less than the adhesive forces between the toner and the fuser roll. Silicone oils, having inherent temperature resistance and release properties suitable for the application, are commonly used as release fluids. Polydimethylsiloxane is a silicone oil that has been used for this purpose advantageously in the past.
Various methods and apparatuses have been used to supply oil to the fuser hot roll, including oil wicking systems, oil delivery rolls, and oil webs. Oil wicking systems include reservoir tanks of the desired release agent or oil, and a piece of fabric wick material having one end mounted in the reservoir and the other end spring biased against the hot roll. Oil from the reservoir is drawn through the fabric wick by capillary action, and is deposited against the roll surface. While a wicking system can be effective in supplying oil to the fuser roll, surface deposit of the oil on the roll can be inconsistent, and the replenishment or replacement of the oil and/or system can be difficult and messy.
A variety of oil delivery roll systems have been used in the past, and include a roll nipped against the hot fuser roll. The oil delivery roll may be either freely rotating against the fuser roll or driven against the roll through a gear train. Oil delivered to the surface of the oil delivery roll is deposited on the hot fuser roll as the rolls rotate against each other. Various structures have been used for providing oil to the surface of the oil delivery roll, including reservoirs at the center of the roll providing oil to the surface through small dispersal holes or via capillary action through the outer material. Felts or metering membranes may be used in the oil delivery roll to control the oil flow through the roll. Another style of such roll is referred to as a web wrapped roll, and includes high temperature paper or non-woven material saturated with oil, and wrapped around a metal core. In yet another type of oil delivery roll, the roll rotates in a vat or reservoir of release oil, picking up a coating of the oil or release agent, which is then, in turn applied to the fuser roll. It is also known to use a roll couple in applying the oil from the vat onto the fuser roll. A first pickup roll rotates in the oil contained in the vat and is nipped against an applicator roll. The applicator roll is nipped against the fuser roll. Oil picked up by the pickup roll is transferred to the applicator roll, and is subsequently transferred to the fuser roll. Arrangements of this type can suffer from similar problems of resupply and cleanliness as oil wicking systems.
Oil web systems include a supply spool of web material, generally being a fabric of one or more layers saturated with the desired oil. Non-woven fabrics of polyester and aramid fibers, such as Nomex® manufactured by DuPont, have been used satisfactorily in oil web systems in the past. A take-up spool is provided for receiving the used web. A web path, commonly including one or more guide rolls, extends from the supply spool to the take-up spool. A portion of the web path brings the web material into contact with the hot fuser roll, either by wrapping a portion of the web around the hot roll, or by utilizing a spring-biased idler roll to nip the web material against the hot roll. As the hot roll rotates against the web in contact therewith, oil is transferred from the web to the fuser roll. Periodically, a drive mechanism for the take-up spool activates, rotating the take-up spool and advancing web material from the supply spool to the take-up spool, thereby bringing a fresh section of web material into contact with the fuser roll.
Oil web systems can be used to deliver oil with good uniformity across the fuser roll surface. However, oil deposits on the hot roll are dependent on the amount of web brought in to contact with the hot roll over a given period of time. Simplified drive mechanisms are known, for driving the take-up spool at a consistent interval and for a consistent time. As spent material accumulates on the take-up spool, the diameter of the spool grows, and the length of material brought in to contact with the hot roll increases if the web is indexed, or advanced, for a set duration at constant intervals. However, it has been difficult to determine the precise remaining life of an oil web system. Sheet counters have been used with some success; however, sheet count alone is not a precise indicator of oil web advancement. Indexing the oil web is not always consistent, and the requirements for oil application and web advancement may vary widely for different media types being printed. Unless complex algorithms are used which take in to consideration the media type being printed, sheet count alone can be quite inaccurate of the remaining unused web length. If the oil web runs out, and inadequate lubrication is provided during a printing job, print quality can be adversely affected, and more critically, damage may occur to fuser components. As a result, a preventative maintenance program may involve changing the oil web after a specified sheet count, which may occur with remaining useful life of the web still available, thus being wasteful. Sheet count is also not useful if a web oil system is removed, and later re-installed in the same or another system. Unless a dedicated sheet counter is supplied on the oil web unit, the sheet count is not preserved with nor transported with the oil web unit.
What is needed is a life determination system for an oil web unit of an imaging apparatus fuser drum which is automatic and accurate, and which can determine remaining web life even if indexing of the web is inconsistent, or if the oil web unit is removed from an imaging apparatus and then reinserted in the same or a different machine.
SUMMARY OF THE INVENTION
The present invention provides an imaging apparatus having an oil web system for applying release oil on the fuser roll, a sensor system, drive and control scheme with which oil web life may be determined based on the actual and contemporaneous operating data from the oil web system.
The invention comprises, in one form thereof, an oil web system in an imaging apparatus fuser having a fuser roll. The oil web system includes an elongated web having fuser roll release agent impregnated therein; a supply spool for holding an unused portion of the web and a take-up spool for holding a used portion of the web. A drive mechanism is operatively connected to the take-up spool for rotating the take-up spool. A web advancement sensor system is provided and generates data signals regarding linear web advancement. A controller activates and deactivates the drive mechanism. The controller is operatively connected to receive data signals regarding drive mechanism activation and the data signals regarding linear web advancement. The controller is adapted to process the data signals and determine remaining web life based on the data signals.
The invention comprises, in another form thereof, a method for operating an oil web system for a fuser roll in an imaging apparatus, including steps of providing a web carrying a release agent therewith, a supply spool for an unused portion of the web, and a take-up spool for a used portion of the web; extending the oil web from the supply spool to the take-up spool along a web path; rotating the take-up spool to draw web material along the web path from the supply spool to the take-up spool; operating a drive mechanism to perform the rotating step; generating a first data set related to actual linear web advancement; generating a second data set related to said operating step; and calculating a remaining length of unused web from said first data set and said second data set.
The invention comprises, in yet another form thereof, an imaging apparatus including a fuser having a fuser roll; a web oiling device operatively disposed to apply oil on the fuser roll, and including a web having oil therein, a supply spool and a take-up spool for the web. A drive mechanism is operatively connected for rotating the take-up spool. A first data signal generating device is provided for generating a first data set regarding linear advancement of the web. A second data signal generating device is provided for generating a second data set regarding operation of the drive mechanism. A drive mechanism controller is adapted to receive the data signals from the first and second data signal generating devices and to calculate a remaining web length from the first and second data signals. A signal pathway is provided between the drive mechanism controller and the drive mechanism.
The invention comprises, in still another form thereof, a method for determining the remaining length of an oil web in an oil web system having a supply spool, a take-up spool, a web path from the supply spool to the take-up spool and an intermittently operated drive mechanism causing advancement of the web from the supply spool to the take-up spool. The method comprises steps of obtaining a first data set regarding linear advancement of the web; obtaining a second data set regarding operating periods of the drive mechanism; and correlating said first data set and said second data set with a stored data set regarding remaining web lengths.
An advantage of the present invention is the consistent and accurate application of release fluid on the fuser roll, and point in life determination for an oil web system.
Another advantage of the present invention is that remaining life of the web can be determined accurately at any state during the life of the oil web system.
Yet another advantage of the present invention is that the life determination procedure is self contained with the oil web system, allowing a user to remove an oil web system and reinstall it, or exchange oil web systems between machines without affecting the accuracy of the remaining web life determination.
A further advantage of the present invention is that an advance warning of web life depletion can be given, allowing the user to be prepared for the need for replacement.
A still further advantage of the present invention is that web exhaustion can be determined, and the machine disabled, thereby preventing potential machine damage from an inadequate supply of release oil.
BRIEF DESCRIPTION OF THE DRAWINGS
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent, and the invention will be better understood by reference to the following description of the embodiments of the invention, taken in conjunction with the accompanying drawings, wherein:
FIG. 1
is a simplified schematic representation of a laser printer in which the present invention may be utilized advantageously;
FIG. 2
is a schematic representation of an oil web system according to a preferred form of the present invention;
FIG. 3
is a cross-sectional view of the oil web system shown in
FIG. 2
, taken along line
3
—
3
of
FIG. 2
;
FIG. 4
; is a flow diagram of a basic drive control scheme for an oil web system according to the present invention; and
FIG. 5
is a flow diagram of a web life determination control scheme of the present invention.
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification set out herein illustrates one preferred embodiment of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention in any manner.
DETAILED DESCRIPTION OF THE INVENTION
Referring now more specifically to the drawings, and to
FIG. 1
in particular, numeral
10
designates an imaging apparatus in the form of a laser printer, in which an oil web system
12
of the present invention, shown in
FIG. 2
, may be used advantageously.
Laser printer
10
, shown in
FIG. 1
, is merely one type of imaging apparatus in which the present invention may be used advantageously. Other types of imaging apparatuses, including other types and configurations of laser or other printers, may readily employ use of the present invention to achieve the advantages incumbent therein. The particular embodiment of the laser printer shown in
FIG. 1
should not be construed as a limitation on the use and application of the present invention, nor on the scope of the claims to follow.
Laser printer
10
includes a laser printhead
20
, which creates an electrostatic image in known fashion on a photosensitive member. Toner is applied to the electrostatic image. It should be understood that in a non-color printer only one printhead might be used; however, in a color printer separate printheads for black, magenta, cyan and yellow toners may be used. The toner image is created on a photoconductive drum and/or image transfer belt
22
, and thereafter transferred to the selected media. The media, such as paper or the like, on which the image is to be printed, is provided from one or more media supply trays
24
, two such media supply trays
24
being shown in FIG.
1
. The media follows a media path, generally indicated by arrows
26
, from one or the other of trays
24
through an image transfer nip
28
, at which the image is transferred from the image transfer belt
22
to the media. Media path
26
may include processing through an associated duplexing side path, for reversing the sheet and bringing the opposite side of the media into image transfer nip
28
in proper orientation for receiving the transfer of an image thereto. Media path
26
includes a series of guide surfaces or belts
30
, and guide rolls
32
to direct the media through the printer
10
. A printed media-receiving zone
34
is provided at the end of the media path
26
, to accumulate the completed pieces of media.
To fix the toner image on the media, a fuser
40
is provided, to apply heat and pressure to the image on the media, thereby causing the toner to melt and flow into the pores or interstices of the media. Fuser
40
includes a hot roll
42
and a backing roll
44
creating a fuser nip
46
through which the media passes. To prevent paper from sticking to hot roll
42
, and to minimize toner offset to the hot roll, oil web system
12
is provided, to apply a release agent, such as silicone oil, to the surface of hot roll
42
.
Those skilled in the art will understand readily the structure and operation of a laser printer as thus far described, and further details thereof are not necessary to an understanding of the present invention, and will not be given further herein.
Referring now to
FIG. 2
, oil web system
12
includes a web
52
of suitable material for carrying release agent. A non-woven fabric of polyester and aramid fibers, such as Nomex® manufactured by and available from DuPont, has been used advantageously in the past. The material is coated or saturated with a release agent, such as silicone oil of polydimethylsiloxane or the like. Web
52
is a relatively thin elongated band stored on a supply spool
54
prior to its use in oil web system
12
. A take-up spool
56
is provided for receiving used or spent portions of web
52
. Between supply spool
54
and take-up spool
56
, web
52
extends along a web path designated by arrows
58
. Web guiding members, including supply spool
54
, take-up spool
56
and other guide rolls or guide surfaces, define the web path. Along at least a portion of the web path, web
52
is brought into contact with hot roll
42
of fuser
40
. Release agent is transferred from web
52
to hot roll
42
at an oil transfer nip
60
. In the embodiment shown, oil transfer nip
60
is created by the close proximity of a spring-loaded biasing roll
62
to hot roll
42
, which holds web
52
against hot roll
42
at oil transfer nip
60
. It should be understood that other arrangements could be used advantageously to bring portions of web
52
into contact with hot roll
42
. For example, two or more rolls may be used to position web
52
such that a segment of web
52
wraps a portion of hot roll
42
. Alternatively, the relative positions of a single idler roll and take-up spool
56
may be such as to cause a portion of web
52
to wrap a portion of hot roll
42
.
In oil transfer nip
60
, or other transfer area at which oil is deposited on hot roll
42
, the surface of hot roll
42
and web
52
move in opposite directions. Tension is applied to web
52
between biasing roll
62
and take-up spool
56
, and, therefore, roll up of web
52
on take-up spool
56
is under tension. Wound-in tension creates a neat, clean wind up of the material on take-up spool
56
. Further, tension is relieved from the segment of the web
52
between supply spool
54
and biasing roll
62
, to prevent unintentional unwind from supply spool
54
, and any resultant foul-up of web
52
, or over application of oil on hot roll
42
.
To effect transfer of web
52
from supply spool
54
to take-up spool
56
, a drive mechanism
64
is provided, connected to take-up spool
56
for rotation thereof to draw web from supply spool
54
. Drive mechanism
64
may include an independent, dedicated prime mover and gear train, a gear train from a common drive for other apparatus in printer
10
, a direct drive prime mover, or the like. The prime mover may be a stepper motor, a solenoid, or other positional activator. Such drive mechanisms are known in the industry, and will not be described in further detail herein. Operation of drive mechanism
64
is controlled by a drive controller
66
, which transmits signals to drive mechanism
64
, including start and stop signals along a signal transmission pathway
68
. Drive controller
66
may include a microprocessor, and other digital or analog control components, and signal transmission pathway
68
is suitable for sending control signals to drive mechanism
64
. Drive controller
66
may be connected to receive additional signal inputs relating to the media type being used, the desired print characteristics and the like, to determine need for oil web advancement. Controller
66
also may include counter means for tracking the number of drive mechanism operations.
In accordance with the present invention, a web advancement sensor system
70
is provided, and includes an idler shaft
72
, properly journaled in bearings, low friction bushings or the like (not shown). A web engagement portion
74
of shaft
72
, such as a sleeve, boss, knurl, shoulder portion of shaft
72
, or the like, is positioned to be in contact with, and partially wrapped by web
52
. Advantageously, web advancement sensor system
70
is disposed along that segment of web
52
between take-up spool
56
and biasing roll
62
, that segment along which there is tension in web
52
. Since web
52
partially wraps engagement portion
74
, as web
52
advances along the path, idler shaft
72
of web advancement sensor system
70
is rotated in direct proportion to the linear movement of web
52
.
An encoder wheel
76
is disposed on idler shaft
72
or engagement portion
74
, for rotation therewith. Encoder wheel
76
includes surface indicia; holes or the like, movement of which may be detected by an appropriate sensor. In the embodiment shown, a band or region
78
is provided near the periphery of the encoder wheel
76
. Within band or region
78
, a hole or opening
80
(FIG.
3
), or a plurality thereof are provided, and may be in specific patterns or orientations. Although band or region
78
is shown as only a segment on wheel
76
, it may extend along a greater portion or entirely around encoder wheel
76
, near the periphery thereof. A transmissive sensor, including an emitter
82
and a receiver
84
, is used to detect movement of encoder wheel
76
, as evidenced by the passage of hole or holes
80
through a region
86
between emitter
82
and receiver
84
. The structures and operations of appropriate sensors that may be used in the present invention, to ascertain the pattern or frequency of hole passings, are known for other uses, will not be described in further detail herein and will be referred to as an encoder wheel sensor
88
. Data signals from encoder wheel sensor
88
are transmitted along a suitable signal pathway
90
to drive controller
66
, which is further connected by a signal pathway
92
to an operator panel
94
, other print manager devices such as printer software on a PC or network shown schematically as a box in FIG.
2
. It should be understood that operator panel
94
will be located at or near the top and or front of printer
10
, at a location readily apparent and accessible to a user of printer
10
, and much of the remaining features shown in
FIG. 2
are located internally of printer
10
. Operator panel
94
may include a user-input pad, various warning and indicator lights, a text message display area and the like. Those skilled in the art will understand readily that by establishing a connection via signal pathway
92
to printer software on a personal computer, or network, messages may be generated also on a computer monitor.
Other types of web movement sensors may be used advantageously in the present invention. The encoder wheel
76
and encoder wheel sensor
88
shown and described are not the only suitable sensors, but are a preferred, low cost and accurate alternative.
The frequency of advancement or indexing of web
52
is determined by pre-stablished parameters in drive controller
66
. Determination of the need for web advancement may include consideration of information regarding the type of media being printed, user input print quality requirements, etc. When a determination is made that oil web advancement is required, drive controller
66
activates drive mechanism
64
, to rotate take-up spool
56
. Web
52
is drawn from supply spool
54
, through oil transfer nip
60
, and spent portions of web
52
are wrapped onto take-up spool
56
. As web
52
is advanced along that segment of the web path between biasing roll
62
and take-up spool
56
, web
52
passes over and rotates idler shaft
72
, and thereby encoder wheel
76
. As encoder wheel
76
rotates, and holes
80
pass through region
86
between emitter
82
and receiver
84
, data related to the passing of holes
80
is transmitted along signal pathway
90
to drive controller
66
, in known manner. Using data from encoder wheel sensor
88
, drive controller
66
terminates the drive signal to drive mechanism
64
, stopping advancement of web
52
when the desired length of web
52
has moved along the web path. In another operating routine, a predetermined number of encoder wheel “signals” is known for the desired web advancement length. Drive mechanism
64
is operated for a pre-established time, or number of steps in the case of a stepper motor. By comparing actual performance in a number of previous operations, prediction is made for the next operation of drive mechanism
64
to achieve the necessary encoder wheel signals. This determination is made independent of the angular movement of take-up spool
56
. In this manner, regardless of the diameter of take-up spool
56
, a consistent, specified, or predetermined length of web
52
is advanced during each indexing step. The linear advancement of web
52
can remain constant, for any diameter of take-up spool
56
throughout, the duration of the life of oil web system
12
. A general drive control scheme
92
for operation of oil web system
12
is shown in FIG.
4
.
Through operation of encoder wheel sensor
88
, controller
66
receives data regarding actual linear advancement of the web. Coupled with data regarding the operation of drive mechanism
64
, the information regarding actual linear advancement can be used for determining the remaining amount of web
52
on supply spool
54
, and the remaining life of oil web system
12
. The present invention provides a closed loop control that enables accurate indexing and web life determination, regardless of the state of life of the web, and independent of web system removal or swapping between machines. As the amount of web material on the take-up spool increases, in order to increment the required web advancement distance, the number of steps required of a stepped drive, such as a stepper motor, decreases. By comparing the steps required of the drive, to the actual linear advancement distance of the web, a determination can be made of the life state of the web. As a general comparison, if drive mechanism
64
activates many times or for a long period of time to advance web
52
a given distance, web system
12
is relatively new, and take-up spool
56
is smaller in diameter, requiring greater rotation to move web
52
the required distance. Conversely, if drive mechanism
64
activates only a few times or for a short time period to advance web
52
the same given distance, web system
12
is old, and take-up spool
56
is large in diameter, requiring less rotation to move web
52
the required distance.
The closed loop system provided by web advancement sensor system
70
, drive mechanism
64
and drive controller
66
allows for direct determination of the life state of oil web system
12
; however, it is more practical to determine stages in the life of web system
12
. At a given indexing ratio between counts of drive mechanism
64
and counts of encoder wheel
76
, a known length of web
52
remains. After the specified ratio has been reached, for each subsequent activation of web system
12
, the known linear length of web
52
advanced is subtracted from the remaining length. At specific remaining lengths, warning signals can be issued, and ultimately the machine stopped when all remaining web
52
has been used.
FIG. 5
illustrates a control scheme
100
for use with a stepper motor as the prime mover in drive mechanism
64
. Control scheme
100
is operable upon an installation
102
of an oil web system
12
in fuser
40
. Upon determination by drive controller
66
of the need therefor, an oil web system indexing step
104
is initiated, that is, drive mechanism
64
is activated, rotating take-up spool
56
and drawing a length of material web
52
along web path
58
from supply spool
54
. As the web is advanced, idler shaft
72
is rotated, turning encoder wheel
76
. Controller
66
determines the actual length of material web
52
advancement from information received from web advancement sensor system
70
, generating a first data set regarding linear web advancement. Controller
66
also determines and tracks, from drive mechanism
64
, data regarding the number of stepper motor “steps” required to cause the determined linear advancement, each such stepper motor step occurring as a result of a signal from drive controller
66
along signal pathway
68
. Controller
66
thereby generates a second data set regarding operation of drive mechanism
64
. In a comparison step
106
, using the first and second data sets, the ratio of stepper motor steps to encoder counts is determined, which may be an average over several recent indexings, and the ratio is compared against a pre-established or target ratio. If the pre-established target ratio is not met or surpassed, no further action is required or taken, and subsequent web indexings occur as described above.
When comparison step
106
determines that the pre-established target ratio of stepper motor steps to encoder counts has been reached, a remaining life calculation step
108
is entered. In the example shown in
FIG. 5
, the target ratio of 3.5 stepper motor steps to encoder counts has been used, which, when reached, indicates a known remaining length of web
52
on supply spool
54
. When the ratio becomes less than 3.5/1, the diameter of take-up spool
56
is large, and the remaining web life is short. For each subsequent activation of oil web system
12
after the target ratio has been reached, the length of web
52
which is advanced along web path
58
, as determined by drive controller
66
from data received from web advancement sensor system
70
, is subtracted from the known remaining length of web
52
. In a multiphase length comparison step
110
, the calculated remaining length is compared to predetermined target lengths. In comparison step first phase
112
, if a first target length is reached, a warning signal
114
is issued, which may be visible as a warning light illumination or text message given at operator panel
94
of printer
10
or sent to a connected personal computer or to other software components of printer
10
for an appropriate warning display. In the case of a network printer, a suitable warning message may be sent to network operating personnel. Oil web system
12
and drive control scheme
92
continue to function, as required. Advance warning of imminent web exhaustion allows the user to prepare by obtaining a replacement oil web system
12
, or by contacting a competent repair service, and scheduling service so as not to interrupt unduly the use of printer
10
. A single such warning message may be given, or as the remaining life of web
52
decreases, subsequent messages may increase in criticality of the message conveyed. Ultimately, as the web life reaches exhaustion, a second phase
116
comparison to zero will be answered “yes” and a shutdown command signal
118
is issued, to disable continued operation of printer
10
and prevent damage to printer
10
, which may occur otherwise from inadequate release oil application on hot roll
42
.
Life determination in accordance with the present invention is independent of whether an oil web system
12
is removed and subsequently reinstalled in the same or another printer
10
. Upon each activation of web system
12
, the calculations are made as shown in and described for FIG.
5
. As such, an oil web system
12
may be removed from one machine and placed in another without the need for resetting page count systems or the like. When an oil web system
12
is installed, life determination begins accurately and automatically, without installer input. System
12
also prevents inadvertent operation of printer
10
after oil web system
12
has been depleted.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
Claims
- 1. An oil web system in an imaging apparatus fuser having a fuser roll, the oil web system comprising:an elongated web having fuser roll release agent impregnated therein; a supply spool for holding an unused portion of said web; a take-up spool for holding a used portion of said web; a drive mechanism operatively connected to said take-up spool for rotating said take-up spool; a web advancement sensor system generating data signals regarding linear web advancement; and a controller for activating and deactivating said drive mechanism, said controller being operatively connected to receive data signals regarding drive mechanism activation and said data signals regarding linear web advancement, and said controller being adapted to process said data signals and determine remaining web life based on said data signals regarding drive mechanism activation and linear web advancement.
- 2. The oil web system of claim 1, further comprising an operator panel for receiving a warning message regarding remaining web life, and a signal pathway between said operator panel and said controller.
- 3. The oil web system of claim 2, wherein said web advancement sensor system includes an encoder wheel driven by movement of said web.
- 4. The oil web system of claim 1, wherein said web advancement sensor system includes an encoder wheel driven by movement of said web.
- 5. A method for operating an oil web system for a fuser roll in an imaging apparatus, comprising the steps of:providing a web carrying a release agent therewith, a supply spool for an unused portion of the web, and a take-up spool for a used portion of the web; extending the oil web from the supply spool to the take-up spool along a web path; rotating the take-up spool to draw web material along the web path from the supply spool to the take-up spool; operating a drive mechanism to perform said rotating step; generating a first data set related to actual linear web advancement; generating a second data set related to said operating step; and calculating a remaining length of unused web from said first data set and said second data set.
- 6. The method of claim 5, further comprising determining from said calculating step when a first target web length remains, and issuing a warning signal in response thereto.
- 7. The method of claim 6, further comprising determining from said calculating step when a second target web length remains, and disabling the imaging apparatus in response thereto.
- 8. The method of claim 5, further comprising determining from said calculating step that no usable web length remains, and disabling the imaging apparatus in response thereto.
- 9. The method of claim 5, further comprising providing an encoder wheel positioned to be moved by linear advancement of the web, and sensing movement of the encoder wheel for said step of generating a first data set.
- 10. The method of claim 9, further comprising providing a stepper motor in the drive mechanism, and said step of generating a second data set includes ascertaining stepper motor steps during web advancement.
- 11. The method of claim 10, further comprising determining a ratio of stepper motor steps to linear advancement distance of the web, and comparing said ratio to a target ratio.
- 12. The method of claim 11, further comprising issuing a warning signal in response to said comparing step determining the target ratio has been reached.
- 13. The method of claim 11, further comprising determining an actual linear advancement distance of the web, and deducting the actual linear advancement distance from a pre-established remaining web distance for each said operating step after said comparing step has determined the target ratio has been reached.
- 14. The method of claim 13, further comprising issuing a warning signal in response to said comparing step determining the target ratio has been reached.
- 15. The method of claim 14, further comprising determining from said calculating step that no usable web length remains, and disabling the imaging apparatus in response thereto.
- 16. The method of claim 5, further comprising providing a stepper motor in the drive mechanism, and said step of generating a second data set includes ascertaining stepper motor steps during web advancement.
- 17. An imaging apparatus comprising:a fuser having a fuser roll; a web oiling device operatively disposed to apply oil on said fuser roll, and including a web having oil therein, a supply spool and a take-up spool for said web; a drive mechanism operatively connected for rotating said take-up spool; a first data signal generating device for generating a first data set regarding linear advancement of said web; a second data signal generating device for generating a second data set regarding operation of said drive mechanism; a drive mechanism controller adapted to receive said data signals from said first and second data signal generating devices and to calculate a remaining web length from said first and second data signals; and a signal pathway between said drive mechanism controller and said drive mechanism.
- 18. The imaging apparatus of claim 17, further comprising an encoder wheel disposed for rotation by linear advancement of said web.
- 19. The imaging apparatus of claim 18, wherein said drive mechanism includes a stepper motor.
- 20. The imaging apparatus of claim 19, further comprising warning signal means connected to said drive mechanism controller.
- 21. The imaging apparatus of claim 17, further comprising warning signal means activated by said drive mechanism controller.
- 22. The imaging apparatus of claim 17, wherein said drive mechanism includes a stepper motor.
- 23. A method for determining the remaining length of an oil web in an oil web system having a supply spool, a take-up spool, a web path from the supply spool to the take-up spool and an intermittently operated drive mechanism causing advancement of the web from the supply spool to the take-up spool, said method comprising steps of;obtaining a first data set regarding linear advancement of the web; obtaining a second data set regarding operating periods of the drive mechanism; and correlating said first data set and said second data set with a stored data set regarding remaining web lengths.
- 24. The method of claim 23, further comprising steps of determining from said correlating step when a target web length remains, and issuing a low web length warning in response thereto.
- 25. The method of claim 24, further comprising the steps of determining from said correlating step when no useful web length remains, and deactivating the imaging apparatus in response thereto.
- 26. The method of claim 23, further comprising the steps of determining from said correlating step when no useful web length remains, and deactivating the imaging apparatus in response thereto.
US Referenced Citations (12)