Patent Grant
8867944
Embodiments described herein relate generally to an image forming apparatus and fuser unit use in the image forming apparatus.
A toner (a visualizing agent) moves to a sheet medium on the basis of image information and is integrated with the sheet medium. The sheet medium (integrated with the toner) is a hard copy.
A fuser integrates the toner with the sheet medium.
A general architecture that implements the various features of the embodiments will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate the embodiments and not to limit the scope of the invention.
In general, according to one embodiment, a fuser comprising: a heating section which heats a hot-melt visualizing material fixed to a sheet medium and the sheet medium; a heat generator which increases the temperature of the heating section in accordance with supply of power; a temperature detector which detects the temperature of the heating section; and a controller which outputs temperature information during the increasing of the temperature on the basis of the temperature of the heating section detected by the temperature detector while the temperature of the heating section increases so that notification can be provided that fusing is possible for an image only using a single color hot-melt visualizing material.
Embodiments will now be described hereinafter in detail with reference to the accompanying drawings.
An MFP 101 shown in
Moreover, the scanner section 5 integrally has an automatically-document feeder (ADF) 7 the original to a reading position on the scanner section 5.
A control panel 9 for giving an instruction for starting image formation in the image forming section 1 and starting to read image information of the original through the scanner section 5 is placed in a strut 9a fixed to the image forming section 1 and a swing arm 9b in a corner at a left or right side behind the scanner section 5.
The image forming section 1 includes first to fourth photoconductive drums 11a to 11d for holding latent images, developers 13a to 13d for supplying a toner to the latent images on the photoconductive drums 11a to 11d to develop toner images, a transfer belt 15 for holding the toner images transferred from the photoconductive drums 11a to 11d in order, cleaners 17a to 17d for cleaning the individual photoconductive drums 11a to 11d, a transfer roller 19 for transferring the toner image held by the transfer belt 15 onto a sheet medium, a fuser 21 for fixing the toner image transferred to the sheet medium by the transfer roller 19 onto the sheet medium, and an exposing device 23 for forming latent images on the photoconductive drums 11a to 11d.
The first to fourth developers 13a to 13d store toners having optional colors of Y (yellow), M (magenta), C (cyan) and Bk (black) which are used for obtaining a color image by a subtractive process and visualize a latent image held by each of the photoconductive drums 11a to 11d in any of the colors Y, M, C and Bk. The respective colors are determined in predetermined order corresponding to an image forming process or a characteristic of the toner.
The transfer belt 15 holds the toner images having the respective colors which are formed by the first to fourth photoconductive drums 11a to 11d and the corresponding developers 13a to 13d in order (of the formation of the toner images).
The sheet feeder 3 supplies the sheet medium to be transferred the toner image by the transfer roller 19.
Cassettes positioned in a plurality of cassette slots 31 store sheet media having optional sizes. Depending on an image forming operation, a pickup roller 33 takes the sheet medium out of the corresponding cassette. The size of the sheet medium corresponds to a size of the toner image formed by the image forming section 1.
A separating mechanism 35 prevents at least two sheet media from being taken out of the cassette by the pickup roller 33.
A plurality of delivery rollers 37 feed the sheet medium separated to be one sheet medium by the separating mechanism 35 toward an aligning roller 39.
The aligning roller 39 feeds the sheet medium to a transfer position in which the transfer roller 19 and the transfer belt 15 come in contact with each other in a timing for transferring the toner image from the transfer belt 15 by the transfer roller 19.
The fuser 21 fixes the toner image corresponding to the image information onto the sheet medium as the output image (hard copy, print out) and feeds the output image to a stocker 47 positioned in a space between the scanner section 5 and the image forming section 1.
The transfer roller 19 is positioned in an automatically-duplex unit (ADU) 41 for replacing both sides of the sheet medium, that is, the output image (hard copy, print out) which has the toner image fixed thereto by the fuser 21.
The ADU 41 moves to a side (a right side) with respect to the image forming section 1, if the sheet medium is jammed between the delivery roller 37 (a final one) and the aligning roller 39 or between the aligning roller 39 and the fuser 21, that is, in the transfer roller 19 or the fuser 21. The ADU 41 integrally has a cleaner 25 for cleaning the transfer roller 19.
A media sensor 45 to detect thickness of the sheet medium conveyed to the aligning roller 39 in the path between the delivery roller 37 and the aligning roller 39. The media sensor 45 useable an optical type benefit of priority from: U.S. patent application Ser. No. 12/197,880 filed on Aug. 25, 2008 and Ser. No. 12/199,424 filed on Aug. 27, 2008 and/or a shift of thickness detecting roller type benefit of priority from: U.S. Provisional Application No. 61/043,801 filed on Apr. 10, 2008, each of which are incorporated.
As shown in the example in
As shown in the examples in
An arbitrary part of the fuser belt 127 and the outer circumference of the pressure roller 125 form a nip due to pressure which is applied to the fuser roller 123 and the pressure roller 125. Therefore, a predetermined pressure and a temperature (fusing temperature) at which toner can be dissolved are applied to a sheet medium passing through the nip, so that the toner (toner image) held by the sheet medium can be fixed.
Any of the heating roller 121, the fuser roller 123 and the pressure roller 125 is rotated at a certain speed through a motor 21a rotating by a predetermined rotation amount in accordance with the control of a motor driver 145 (see
The heating roller 121 has a diameter of, for example, 30 mm, and as an example, a heater (heating element or heating device) 129 is included therein. The heater 129 may be a lamp, a resistance wire or the like. The heater 129 may be positioned outside the fuser belt 127 along the outer circumference of the fuser belt 127. The heating roller 121 is provided with a tube made of aluminum formed at a thickness of 0.8 mm, and a tetrafluoroethylene resin or a fluorine resin is preferably disposed as a releasing layer on the surface thereof.
The fuser roller 123 has a diameter of, for example, 38 mm, and an elastic body having a predetermined thickness such as silicon rubber is preferably disposed around the axis thereof.
The pressure roller 125 has a diameter of, for example, 40 mm. An elastic body having a predetermined thickness such as rubber having hardness higher than that of the elastic body which is used in the fuser roller 123 is preferably disposed around the axis thereof, and the surface thereof is preferably coated with a releasing layer formed of a tetrafluoroethylene resin or a fluorine resin. The pressure roller 125 further includes a heater (heating element or heating device) 128 therein. The output of the heater 128 may be ½ to ¼ of the output of the heater 129 which is used in the heating roller 121.
As an example, the fuser belt 127 is provided with an elastic body such as silicon rubber having a predetermined thickness, and a releasing layer formed of a tetrafluoroethylene resin or a fluorine resin is preferably disposed on the surface thereof (surface on the side coming into contact with the pressure roller 125). The elasticity of silicon rubber is preferably either the same hardness as the hardness of the elastic body which is used in the fuser roller 123 or softer. In addition, if necessary, a reinforcing member which is formed of a sheet-like metal (metal film) or the like may be provided on the back surface thereof (surface on the side coming into contact with the fuser roller 123).
As shown in the example in
The output of each of the lamps (heaters) is controlled in accordance with the temperatures, which are detected by thermistors (temperature sensors) 122a and 122b with the fuser belt 127 interposed therebetween, at two points which are around the center and the end in the longitudinal direction of the heating roller 121, the temperature which is detected by a thermistor 126 measuring the temperature around the center in the longitudinal direction of the pressure roller 125, the allowable maximum supply power that the power monitoring/management unit 137 permits, and the output value of the heater driving circuit 143 which is set by the CPU 139.
As shown in
In addition, as shown in
The toners which are used in the MFP 101 are a black (Bk) toner which is used in the output of black-and-white (B/W) images, and cyan (C), magenta (M) and yellow (Y) toners which are used in the output of color images.
Each of melting points of the Bk toner for black and white (B/W) image, C toner, M toner and Y toner for color images are same. However, the toner amount (thickness) of the color image is lager (thick) than the Bk toner (B/W image). Accordingly, when an output image is only a B/W image, the lower limit temperatures when warming-up allowing the rise of the temperatures of the fuser belt, the heating roller and the pressure roller up to certain temperatures is completed can be set to be lower than those when color images are formed. In contrast, the lower limit temperatures when warming-up allowing the rise of the temperatures of the fuser belt, the heating roller and the pressure roller up to determine can be set to be lower than those when color images are formed.
In
In
In
That is, the drawing shows that when the image output required of the MFP 101 is B/W image output, except for image output using only an arbitrary color different from the Bk toner which is referred to as a mono color, printout is possible even during the period in which the temperatures of the fuser belt (heating roller) and the pressure roller are increasing to temperatures at which color images can be output. Accordingly, during the warming-up operation from immediately after power-on of the main power source of the MFP 101 to when the ready state is reached, during the temperature control for recovery from the sleep (power saving) mode, during the waiting until the temperatures of the fuser belt (heating roller) and the pressure roller increase resulting from the repeated image output, or in other cases, when a printing request relates to the B/W image output, the waiting time until the image output is possible in the temperature control (up to a temperature at which color images can be output) of which the detailed example is shown in
For example, as shown in
In detail, as shown in
When the pre-running for solving the temperature variation of the fuser belt 127 and the pressure roller 125 is started [A12], the temperature of the fuser belt 127 (heating roller 121) is temporarily lowered. Accordingly, the heating (temperature increasing) by the heater 129 continues during the period up to when the temperatures Tbm (fuser belt) and Tpm (pressure roller) both of for allowable “Ready for B/W image” at which B/W images can be formed (fusing without the occurrence of fusing offset) are reached [A13].
When the temperature of the fuser belt 127 reaches Tbm and the temperature of the pressure roller 125 reaches Tpm [A13-Y], in the CPU 139, the end of B/W warming-up allowing the formation of B/W images is detected [A14] and a display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which image formation not for the case of color image output is possible, such as “B/W image can be output” [A15].
Next, the pre-running continues [A16] and the heating (temperature increasing) by the heater 129 continues during the period up to when the temperatures of the fuser belt 127 (heating roller 121) and the pressure roller 125 reach the temperatures Tbc (fuser belt) and Tpc (pressure roller) both of for allowable “Ready for color image” at which color images can be formed [A17].
When the temperature of the fuser belt 127 reaches Tbc and the temperature of the pressure roller 125 reaches Tpc [A17-Y], in the CPU 139, the end of (color) warming-up allowing the formation of images regardless of the image kinds is detected [A18], the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which arbitrary image formation including the color image output is possible, such as “All of images can be output” [A19], and the process advances to the temperature control of the waiting state (ready state).
As described above, a user who tries to output only a B/W image can be notified of the minimum necessary time up to the completion of warming-up.
According to the example shown in
However, there is no instruction for image formation after the output of the B/W image (there is no next job), the effect up to the completion of warming-up allowing the output of all the kinds of images due to the priority given to the output of B/W images is not large.
In greater detail, when there is a B/W image output request [B01] during the period up to when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which B/W images can be output are reached, as shown in
When the temperature of the fuser belt 127 reaches Tbm and the temperature of the pressure roller 125 reaches Tpm [B13-Y], in the CPU 139, the end of B/M warming-up allowing the formation of B/W images is detected [B14] and the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which image formation not for the case of color image output is possible, such as “B/W image can be output” [B15].
Then, the B/W image formation which is requested by [B01] is carried out [B16].
Next, the pre-running continues [B17] and the heating (temperature increasing) by the heater 129 continues during the period up to when the temperatures of the fuser belt 127 (heating roller 121) and the pressure roller 125 reach the temperatures Tbc (fuser belt) and Tpc (pressure roller) both of for allowable “Ready for color image” at which color images can be formed [B18].
When the temperature of the fuser belt 127 reaches Tbc and the temperature of the pressure roller 125 reaches Tpc [B18-Y], in the CPU 139, the end of (color) warming-up allowing the formation of images regardless of the image kinds is detected [B19], the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which arbitrary image formation including the color image output is possible, such as “All of images can be output” [B20], and the process advances to the temperature control of the waiting state (ready state).
Accordingly, a B/W image can be output to a user who requests output only of a B/W image in the minimum necessary waiting time during the period up to when the warming-up is completed, and a user who tries to output a color image can also be notified of the completion of warming-up in the minimum necessary time.
In addition, when there is a B/W image output request [C01] during the period between when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which B/W images can be output are reached and when the temperatures Tbc (fuser belt) and Tpc (pressure roller) at which color images can be output are reached, as shown in
When the temperature of the fuser belt 127 reaches Tbm and the temperature of the pressure roller 125 reaches Tpm [C13-Y], in the CPU 139, the end of B/M warming-up allowing the formation of B/W images is detected [C14] and the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which image formation not for the case of color image output is possible, such as “B/W image can be output” [C15].
Next, the pre-running continues [C16] and the B/W image formation which is requested by [C01] is carried out [C17] when there is the B/W image output request [C01].
The pre-running continues [C18] and the heating (temperature increasing) by the heater 129 continues during the period up to when the temperatures of the fuser belt 127 (heating roller 121) and the pressure roller 125 reach the temperatures Tbc (fuser belt) and Tpc (pressure roller) both of for allowable “Ready for B/W image” at which color images can be formed [C19].
When the temperature of the fuser belt 127 reaches Tbc and the temperature of the pressure roller 125 reaches Tpc [C19-Y], in the CPU 139, the end of (color) warming-up allowing the formation of images regardless of the image kinds is detected [C20], the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which arbitrary image formation including the color image output is possible, such as “All of images can be output” [C21], and the process advances to the temperature control of the waiting state (ready state).
Accordingly, a B/W image can be output to a user who requests output only of a B/W image in the minimum necessary waiting time during the period up to when the warming-up is completed, and a user who tries to output a color image can also be notified of the completion of warming-up in the minimum necessary time.
As described above, according to the example shown in
In addition, for example, when the B/W image output is requested after request of the color image output during the period from immediately after the start of warming-up to when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which B/W images can be output are reached, as shown in
For example, when there is a color image request [Dc01] during the period up to when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which B/W images can be output are reached, and there are B/W image output requests [Dm01] and [Dm02] during the period between when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which B/W images can be output are reached and when the temperatures Tbc (fuser belt) and Tpc (pressure roller) at which color images can be output are reached or during the period up to when the temperatures Tbm (fuser belt) and Tpm (pressure roller) both of for allowable “Ready for B/W image” at which B/W images can be output are reached, as shown in
When the temperature of the fuser belt 127 reaches Tbm and the temperature of the pressure roller 125 reaches Tpm [D13-Y], in the CPU 139, the end of B/M warming-up allowing the formation of B/W images is detected [D14] and the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which image formation not for the case of color image output is possible, such as “B/W image can be output” [D15].
Next, the pre-running continues [D16] and the B/W image formation which is requested by [Dm01] is carried out [D17] when there is the B/W image output request [Dm01].
The pre-running continues [D18] and the heating (temperature increasing) by the heater 129 continues during the period up to when the temperatures of the fuser belt 127 (heating roller 121) and the pressure roller 125 reach the temperatures Tbc (fuser belt) and Tpc (pressure roller) both of for allowable “Ready for color image” at which color images can be formed [D19].
When the temperature of the fuser belt 127 reaches Tbc and the temperature of the pressure roller 125 reaches Tpc [D19-Y], in the CPU 139, the end of (color) warming-up allowing the formation of images regardless of the image kinds is detected [D20], the display region in the control panel 9 displays a display that provides notification that the temperatures of the fuser belt and the pressure roller increase up to temperatures at which arbitrary image formation including the color image output is possible, such as “All of images can be output” [D21], the color image requested by [Dc01] is output [D22] and the process advances to the temperature control of the waiting state (ready state).
In addition, during the period up to when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which B/W images can be output are reached, the output of the B/W image requested by [Dm02] precedes the output of the B/W image requested by [Dm01] at the time when the end of B/W warming-up allowing the formation of B/W images can be detected [D14] in the CPU 139 as in [B01] shown in
Accordingly, for example, when the B/W image output is requested after request of the color image output during the period up to when the warming-up is completed, a B/W image can be output to a user who requests output only of a B/W image in the minimum necessary waiting time, and a user who tries to output a color image can also be notified of the completion of warming-up in the minimum necessary time.
On the other hand, when the number of B/W output images requested after request of the color image output is large, the necessary time which is required to output color images increases. Accordingly, the number of B/W output images, which can be placed ahead of the output of color images in [D17], may be limited to, for example, five or less.
At the time when the temperatures Tbm (fuser belt) and Tpm (pressure roller) at which the B/W images can be output are reached, when the B/W image output is carried out, but for example, when a sheet medium has a large thickness, it should be considered that the fusing ratio (fusing stability) is lowered although fusing offset does not occur. For example, when the thickness of paper (sheet medium) (which is detected by the media sensor 45) is larger than a certain thickness, the image output can be permitted at the time when the temperatures Tbc (fuser belt) and Tpc (pressure roller) at which all of the images can be output are reached even when an instruction for the image output only of B/W images is issued.
Here, TABLE 1 shows examples of the measurement of a time for recovery from the sleep state where power consumption is reduced than in the ready state to the ready state in which the temperatures Tbc (fuser belt) and Tpc (pressure roller) at which image output of color images is possible as well as image output only of B/W images are reached by changing the thickness of paper (sheet medium) by using
Referring to TABLE 1, when the paper (sheet medium) thickness is 64 g/m2, the difference between the time which is required for temperature increasing up to a temperature at which images can be output in the normal ready recovery control (sleep→waiting) shown in
By employing such a configuration, in the recovery control for recovering the temperature of the fuser which fuses a toner image on a sheet medium from the sleep state where the above temperature is lower than in the ready (waiting) state where images can be instantly output to the ready state, the necessary time (waiting time) up to the image output (to actually output images) can be reduced in the image output only of black-and-white (B/W) images, except for the image output using only an arbitrary color different from the Bk toner.
In addition, when there is a B/W image output request and a color image output request during the recovery control for recovering the above-described fusing temperature from the sleep state where the above temperature is lower than in the ready (waiting) state to the ready state, the B/W image output is placed ahead of the color image output for which the waiting time increases in general. Accordingly, it is possible to increase the convenience of a user who demands the image output of B/W images which are required to be output with as shorter waiting time as possible.
While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.
When the MFP 101 is connected to a network, the image data supply source (source for printing request of image output) may be a client PC (personal computer) on the network. In this case, when a printing request from the client PC is only for a B/W image and an image which is input by the scanner section 5 of the MFP 101 is a color image, the priority of the printout only of a B/W image is set to be behind that of the output of the color image which is input by the scanner section 5 due to the control of the CPU 139 (the above-described embodiments are cancelled). This is because regarding the printout from the client PC, it takes time for a user transmitting the printing request to collect the printouts.
This application is based upon and claims the benefit of priority from: U.S. Provisional Application No. 61/309,946 filed on Mar. 3, 2010, the entire contents of each of which are incorporated herein reference.
| Number | Name | Date | Kind |
|---|---|---|---|
| 20050163524 | Shiobara et al. | Jul 2005 | A1 |
| 20080298860 | Omata | Dec 2008 | A1 |
| 20090238596 | Shiobara et al. | Sep 2009 | A1 |
| Number | Date | Country |
|---|---|---|
| 2002-067446 | Mar 2002 | JP |
| 2004-133216 | Apr 2004 | JP |
| 2008-008936 | Jan 2008 | JP |
| 2009-173380 | Aug 2009 | JP |
| Entry |
|---|
| Japanese Office Action for Japanese Patent Application No. 2011-046877 mailed on Dec. 10, 2013. |
| Japanese Office Action for Japanese Patent Application No. 2011-046877 mailed on Mar. 11, 2014. |
| Number | Date | Country | |
|---|---|---|---|
| 20110217063 A1 | Sep 2011 | US |
| Number | Date | Country | |
|---|---|---|---|
| 61309946 | Mar 2010 | US |
