JP3684349B2 - Fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing device used in an image forming apparatus employing an electrophotographic system such as a copying machine, a facsimile machine, and a printer, and more particularly to a cleaning device provided with a web device for cleaning a fixing roller.
[0002]
[Prior art]
In an image forming apparatus such as a copying machine, a sheet on which an unfixed toner image is formed is nipped and conveyed between a pair of fixing rollers including a heating roller and a pressure roller, so that the toner image is melted and fixed on the sheet. There are very many products that use the heat fixing method. A widely known fixing device in this heat fixing system is equipped with a web cleaning unit that abuts a web impregnated with oil for cleaning the residual toner on the heat roller and preventing offset, on the surface of the heat roller. It has been. The web cleaning unit mainly includes a web, a winding roller that winds the web, a winding roller that winds the web wound around the winding roller, and the like. For example, in the case of a copying machine, the portion of the web that comes into contact with the surface of the heating roller gets dirty every time a copy is made. Therefore, every time several tens of copies are made, the take-up roller is rotated a predetermined amount to take up the used web. The new web is brought into contact with the surface of the heating roller.
[0003]
When employing such a web cleaning mechanism, it is necessary to pay attention to prevent the web itself from sagging in order to achieve smooth cleaning.
Therefore, conventionally, for example, as in registered patent 28882842, a gear is provided on the web feed shaft and the take-up shaft, and the brake mechanism is meshed with this gear, thereby preventing unnecessary rotation of the shaft and preventing sagging. doing.
Alternatively, a ratchet mechanism is adopted for the take-up shaft and a one-way clutch is used for the feed shaft to prevent web slack (Japanese Patent Laid-Open No. Hei 8-152801).
[0004]
However, in this prior art, although a relatively weak spring property is used, a plate-like brake member is engaged with a gear and used, so a load is applied not a little. Also, a contact sound between the gear and the brake is generated.
Also, when a one-way clutch is used, when the web cleaning mechanism is unitized, if this unit is connected to an external drive means with a gear, etc., the rotation of the gear itself is controlled by the action of this one-way clutch. Therefore, it is difficult to release the gears and release them.
[0005]
[Problems to be solved by the invention]
Therefore, there is a demand for a technique that can further prevent the sagging of the web even when the conventional technique is further improved, the web cleaning mechanism is unitized, and a mechanism that is detachable from the fixing device is employed.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to form an image that can prevent web sagging even when the web cleaning mechanism is unitized and a mechanism that is detachable from the fixing device is employed. A device is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is provided with a detachable web cleaning unit that contacts the web impregnated with the release agent with the heating roller to clean the surface of the heating roller. In the fixing device, the web cleaning unit includes a feed roller around which an unused web is wound and a wind-up roller that winds up the used web, and a rotational force is transmitted to the wind-up roller on the shaft of the wind-up roller. The take-up gear is attached to the take-up shaft so as to be rotatable by a predetermined angle, and the take-up gear is engaged with a transmission gear for transmitting drive from a drive source. A fixing device is provided with a one-way clutch that is rotatable only in one direction with respect to driving from a driving source.
[0008]
According to the first aspect of the present invention, since the take-up gear is rotatable by a predetermined angle with respect to the take-up shaft, even when a one-way clutch is inserted in the drive connecting means of the take-up mechanism, the take-out gear can be removed. Sometimes the take-up gear rotates and the meshing with the drive gear can be easily released.
[0009]
According to a second aspect of the present invention, in the fixing device according to the first aspect, the winding gear has a pair of substantially fan-shaped spaces facing the rotation center.
[0010]
According to the present invention, by forming a substantially fan-shaped space in the gear itself, the winding gear can be rotated by a predetermined angle without using a complicated mechanism.
[0011]
According to a third aspect of the present invention, in the fixing device according to the first aspect, the winding roller shaft engages with the fan-shaped space of the winding roller at an end portion thereof, and transmits the drive to the shaft as the winding gear rotates. For this purpose, a pin member is provided.
[0012]
According to the third aspect of the present invention, the pin member attached to the winding shaft moves in the substantially fan-shaped space and engages with the side surface portion of the fan-shaped space, so that the drive of the gear can be transmitted to the shaft. Therefore, it is possible to secure drive transmission to the shaft with an extremely simple mechanism and a rotatable play space for the gear when the unit is taken out.
The features of the present invention will be described below with reference to the accompanying drawings.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a copying machine as an example of an image forming apparatus to which the fixing device of the present invention is applied, FIG. 2 is a schematic cross-sectional view showing the fixing device, and FIG. It is the fragmentary perspective view which showed the force transmission mechanism.
[0015]
First, referring to FIG. 1, the copying machine includes a paper feeding unit 100 disposed in a lower portion of the copying machine main body 1, and a paper conveying unit 200 disposed on the side and above the paper feeding unit 100. An image forming unit 300 disposed above the sheet conveying unit 200, a fixing device 400 disposed on the discharge side of the image forming unit 300, and the image forming unit 300 and the fixing device 400. An image reading unit 500 made of an optical system member or the like disposed above is provided.
[0016]
The paper feed unit 100 is moved from the selected paper feed cassette 111 out of the four paper feed cassettes 111 to the exit side of the paper feed cassette 111 (right side in FIG. 1) by the rotation operation of the paper feed roller 112 having an arc outer periphery. In addition, the paper 115 is sent out to the paper feeding cassette 111, and the paper 115 is fed by the separating sections 116 provided at both upper ends in the width direction, so that the uppermost paper 115 is reliably fed to the paper transport section 200 one by one. It has become. Further, these four paper feed cassettes 111 are configured to be freely drawn out from the copying machine main body 1.
[0017]
The paper transport unit 200 transports the paper 115 fed from the paper feed unit 100 toward the image forming unit 300 by the transport roller pair 202 and the registration roller pair 203, and further, the image forming unit 300 performs an image in the fixing device 400. The formed paper 115 is discharged onto the discharge tray 204 by the discharge roller pair 205. Further, a discharge switch SW is provided on the upstream side in the transport direction of the discharge roller pair 205 and on the downstream side in the transport direction of the fixing device 400 described later. The discharge switch SW is used for detecting a paper jam in the paper transport unit 200 and for counting the number of copies copied by the copying machine main body 1. The counting of the number of copies by the discharge switch SW will be described later.
[0018]
The image forming unit 300 forms a predetermined toner image on the paper 115 by an electrophotographic process. The image forming unit 300 has a photoconductive drum 301 having a photoconductivity supported rotatably and a periphery of the photoconductive drum 301. A charging unit 302, an exposure unit 303, a developing unit 304, a transfer unit 305, a cleaner 306, and a charge eliminating unit 307 are provided along the rotation direction.
[0019]
The charging unit 302 includes a charging wire to which a high voltage is applied, and applies a predetermined potential to the surface of the photosensitive drum 301 by corona discharge from the charging wire. The exposure unit 303 irradiates the photosensitive drum 301 with laser light output from a laser emitter based on image data of a document read by an image reading unit 500 described later via a polygon mirror and a reflecting mirror. Then, the potential on the surface of the photosensitive drum 301 is selectively attenuated to form an electrostatic latent image on the surface of the photosensitive drum 301. The developing unit 304 develops the electrostatic latent image with toner to form a toner image on the surface of the photosensitive drum 301. The transfer unit 305 transfers the toner image on the surface of the photosensitive drum 301 onto the paper 115. In this copying machine, the transfer unit 305 is constituted by a transfer roller that is separated from the photosensitive drum 301 by a predetermined distance. The cleaner 306 removes toner remaining on the surface of the photosensitive drum 301 after transfer. The static elimination unit 307 is for removing residual charges on the surface of the photosensitive drum 301.
[0020]
The fixing device 400 is disposed downstream of the image forming unit 300 in the paper conveyance direction, and the heating roller 401 and the pressure roller that presses the paper 115 on which the toner image is transferred in the image forming unit 300 against the heating roller 401. The toner image is fixed on the paper 115 by being sandwiched and heated by 402. The fixing device 400 is provided with a web cleaning unit 600 (not shown in FIG. 1) for the purpose of cleaning residual toner adhering to the surface of the heating roller 401 and preventing offset. The web cleaning unit 600 will be described later.
[0021]
The image reading unit 500 irradiates a document placed on the contact glass 501 with light from an exposure lamp, and guides the reflected light to a photoelectric conversion unit including a CCD line sensor or the like via a reflecting mirror. The image information is read. The exposure lamp and the reflecting mirror form a scanning operation unit, and the scanning operation unit moves on the contact glass 501 by moving the moving region 508 in the left-right direction in FIG. 1 at a predetermined speed. The entire surface of the prepared document can be scanned to read the image of the entire document.
[0022]
Next, a specific configuration of the web cleaning unit 600 will be described with reference to FIGS. 2 and 3. Two heaters 410 and 411 are built in the heating roller 401 and rotate in the direction of arrow A. A web cleaning unit 600 is disposed on the opposite side of the pressure roller 402 so that the oil-impregnated web 601 contacts the surface of the heating roller 401. The web 601 is a thin web-like sheet made of an unknown cloth, paper, cloth, or the like, and the web 601 is preferably impregnated with silicon oil.
[0023]
The web cleaning unit 600 includes a winding roller 610 that winds the web 601, a winding roller 630 that winds the web 601 wound by the winding roller 610, and between the winding roller 610 and the winding roller 630. The web 601 spanned between the two is mainly composed of a pressing roller 620 pressed against the surface of the heating roller 401 by a spring 605, and is a unit that can be attached to and detached from the fixing device 400.
[0024]
The winding roller 610, the pressing roller 620, and the winding roller 630 are pivotally supported on a side plate or the like constituting the housing 607 of the web cleaning unit 600. The winding roller 610 and the take-up roller 630 are made of only a core metal such as aluminum, and the web 601 is wound around the core metal. The pressing roller 620 is made of, for example, silicon sponge. Further, a winding gear portion 631 for transmitting driving to the winding roller 630 is provided at one end portion of the winding roller 630. The winding gear 631 is gear-coupled to the drive gear 651 via the transmission gear 641. As shown in FIG. 3, this transmission gear has a structure provided with gears at both ends of the shaft 647. One transmission gear 641 meshes with the take-up gear 631, and the other gear is coaxial with the fixing device main body. This is a transmission gear 642 (hereinafter referred to as a one-way gear) having a one-way clutch 643 attached to the outer plate. The drive gear 651 is meshed with the one-way gear 642 so that the drive gear 651 is allowed to rotate only in the rotation direction.
[0025]
The drive gear 651 is formed with a ratchet gear portion 652 coaxially with the drive gear, and is intermittently driven by engagement with a hook 662 formed at the free end of the plunger 661 of the solenoid (drive source) 660. It has become. Therefore, when the solenoid 660 is activated and the plunger 661 moves in the direction of the arrow F, the drive gear 651 rotates intermittently in the direction of the arrow E to wind up via the one-way gear gear 642, the transmission gear 641, and the winding gear 631. The roller 630 rotates in the arrow B direction. As a result, the web 601 moves in the direction of arrow C. In this way, the cleaning performance is improved by reversing the moving direction of the web 601 (arrow C direction) and the rotation direction of the heating roller 401 (arrow A direction). Moreover, since the one-way clutch 643 is attached to the drive transmission mechanism, the reverse rotation of the take-up roller 630 is restricted, and the web is taken up without sagging.
[0026]
The copying machine main body 1 including the web cleaning unit 600 having the above-described configuration includes a number counter 800 that counts the number of sheets of copied paper 115 (image-formed). The number counter 800 counts when the sheet 115 that has passed the discharge switch SW is detected. In response to the number counter 800 reaching a predetermined count value T2, the solenoid 660 is driven by a predetermined amount and the winding control means 710 for winding the web 601 by the winding roller 631 is operated. Yes. In the present embodiment, the take-up control means 710 operates with T2 = 30 sheets, but the value of T2 can be selected as appropriate. The winding amount of the web 601 by the winding roller 630 per turn may be about several millimeters, but this winding amount can be selected as appropriate.
[0027]
In addition, the copying machine main body 1 includes a maintenance display instruction unit 810 that displays on the display unit 900 that maintenance is to be performed when the number counter 800 reaches a predetermined count value T1. The maintenance display instruction means 810 operates in response to the number counter 800 reaching T1, but in this embodiment, T1 = 500,000 sheets. The value of T1 may be set to the number of copies that is the maintenance life depending on the model, and this value can be selected as appropriate. When the maintenance display instructing means 810 is activated and the display unit 900 displays that maintenance is to be performed, the user contacts the service person, and the service person appropriately replaces desired parts or performs maintenance. Become. When the maintenance is completed, the service person resets the number counter 800, and the number counter 800 counts the number of sheets 115 copied again.
[0028]
When the winding control means 710 is operated and the web is wound by the winding roller 630, a web winding counter 720 that counts the number of windings counts. The web winding counter 720 is provided in the web cleaning unit 600 and is electrically connected to a solenoid 660 that is a driving source. That is, every time the solenoid 660 is actuated, the web winding counter 720 counts.
[0029]
The web cleaning unit 600 also includes a web replacement display instruction unit 730 that displays on the display unit 900 that the web 601 is to be replaced in response to the web winding counter 720 reaching a predetermined count value T3. ing. In this embodiment, T3 = 17000 is set. That is, the take-up control means 710 operates once for 30 sheets of paper 115 copied by the copying machine main body 1, so that the web exchange display instruction means 730 operates at 30 × 17000 = 510,000 sheets. Become. This is set to the number of copies predicted that the web 601 is almost taken up by the take-up roller 630 and the web needs to be replaced. Note that T3 is set to a value that is predicted to require replacement of the web 601, and this value can be selected as appropriate depending on the model.
[0030]
Further, in the copying machine main body 1, the winding of the web 601 by the winding roller 630 is almost completed, and the web 601 to be wound is not in the winding roller 610, and the web 601 is wound by the winding roller 630 any more. When the number of copies that is expected to interfere with the web cleaning unit 600 is reached, the operation of the copying machine main body 1 is prohibited to prevent copying. Such an operation is also performed based on the count value of the web winding counter 720. That is, the copying machine main body 1 has a mechanical lock instruction means (not shown) for stopping the operation of the copying machine main body 1 in response to the web winding counter 720 reaching a predetermined count value T4. I have. In this embodiment, T4 = 18000 is set. That is, the mechanical lock instruction means operates when the number of sheets copied by the copying machine main body 1 is 30 × 18000 = 540000 sheets.
[0031]
Next, with reference to FIG. 4, the operation of the cleaning device will be described using a flowchart. First, when copying is performed by the copying machine main body 1 (S1), the paper 115 is detected by the discharge switch SW, and the count value of the number counter 800 is counted (S2). Next, it is determined whether or not the count value by the number counter 800 has reached a predetermined count value of 500000 (T1) (S3). If not reached (if N is less than 500,000) proceed to S4, if reached (if N is greater than 500,000) proceed to S13. In S4, it is determined whether or not the count value of the number counter 800 is a multiple of 30 in order to wind up the web 601 by a predetermined amount every 30 sheets of sheets 115 copied by the copying machine main body 1. If it is not a multiple of 30, the process returns to S1, and if it is a multiple of 30, the winding control means 710 is operated (S5). By the operation of the winding control means 740, the solenoid 660 is driven (the plunger 661 moves in the direction of arrow F in FIG. 2), and the winding roller 630 is moved through the driving gear 651 and the transmission gear 641 in the direction of arrow B in FIG. The web 601 is wound up by a predetermined amount in the direction, and the new web 601 comes into contact with the surface of the heating roller 401. After that, the plunger 661 moves in the direction opposite to the arrow F direction in FIG. 2 and returns to the original standby state. However, since the drive gear 651 includes the ratchet gear portion 652, the drive gear 651 does not rotate in the direction opposite to the direction of arrow E in FIG. Further, since the one-way gear 642 is arranged coaxially with the transmission gear 641, the winding roller 631 does not rotate in the direction opposite to the arrow B direction in FIG. 2, so that the stable winding of the web 601 by the winding roller 630 is possible. Can be taken.
[0032]
When the winding control means 710 operates, the count value of the web winding counter 720 is counted (S6). Next, it is determined whether the count value by the web winding counter 720 has reached a predetermined count value of 17000 (T3) (S7). If not reached (if M is smaller than 17000), the process returns to S1, and if reached (if M is greater than 17000), the process proceeds to S8. In S8, it is determined whether or not the count value of the web winding counter 720 has reached a predetermined count value of 18000 (T4). If not reached (if M is less than 18000) proceed to S9; if reached (if M is greater than 18000) proceed to S15.
[0033]
In S9, that is, when the count value of the web take-up counter 720 is larger than 17000 and smaller than 18000, the web exchange display instructing means 730 operates to display on the display unit 900 that the web 601 is to be exchanged. When such a display is displayed on the display unit 900, the user contacts the service man, and the service man exchanges the web 601 for a new one (S10). Regardless of whether the web 601 has been replaced, the process proceeds to S11.
[0034]
On the other hand, in the case of NO in S3, that is, when the count value by the number counter 800 has reached a predetermined count value of 500,000 (T1), the maintenance display instruction means operates (S13), and maintenance is performed on the display unit 900. A message to do so is displayed. When such a display is displayed on the display unit 900, the user contacts the service man, and the service man performs replacement and maintenance of parts (S14). Even if such a display is displayed on the display unit, if the user does not contact the service person and the maintenance is not performed, the process proceeds to S4 and the copying by the copying machine main body 1 is continued. It becomes. However, when the count value of the web take-up counter 720 exceeds 18000 in S8 (when the number of sheets copied by the copying machine body 1 exceeds 18000 × 30 = 540000 sheets), the operation of the copying machine body 1 is stopped. The machine lock instruction means is activated (S15), and the copying machine main body 1 is in a state where copying cannot be performed. Thereafter, the process returns to S14.
[0035]
If the maintenance by the service person is performed in S14 (YES in S14), the process proceeds to S10. Here, the maintenance display instruction means 810 operates when the count value of the sheet counter 800 operates at 500,000 sheets, and the count value of the web take-up counter 720 at this time is 16666 (500000 ÷ 30). Since the predetermined count value T3 is reached, the serviceman also exchanges the web 601. Accordingly, the process proceeds to S11 regardless of whether the web 601 has been replaced in S10.
[0036]
In S11, it is determined whether or not the number counter 800 has been reset. If it has not been reset (NO in S11), the process returns to S13 to display on the display unit 900 that the maintenance display instruction means 810 is operated to perform maintenance. If the number counter 800 is reset (YES in S11), the process proceeds to S12.
[0037]
In S12, it is determined whether or not the web winding counter 720 has been reset. If the web winding counter 720 is reset, there is no problem, but if the resetting is forgotten (NO in S12), the process returns to S9 to operate the web exchange display instruction means 730. As described above, even if the web take-up counter 720 is forgotten to be reset, the web exchange display instructing means 730 is operated so that the display unit 900 displays that the web 601 is to be exchanged. If the web 601 has not been replaced, it will be noted that the web 601 must be replaced. In addition, when the web 601 is exchanged, such a display appears even though the web 601 is exchanged. Since the only way to clear this display from the display unit 900 is to reset the web take-up counter counter 720, the serviceman always resets the web take-up counter 720. This ensures that the web 601 is replaced, and immediately after the web 601 is replaced (several tens or hundreds of copies), a display indicating that the web 601 is to be replaced is displayed on the display unit 900. No, you can copy properly.
[0038]
Next, the procedure for replacing the web cleaning unit when the replacement display of the web 601 is displayed will be described using FIG. 3 again.
As described above, the web cleaning unit 600 is unitized and can be replaced. The web cleaning unit 600 can be removed by releasing the meshing of the transmission gear 641 attached to the fixing device 400 side and the winding gear 631 attached to the web cleaning unit 600 side.
[0039]
However, the take-up roller 630 is restricted by the action of the one-way gear 642 provided in the drive transmission path, so that the rotation in the counterclockwise direction in FIG. For this reason, in this embodiment, a mechanism that allows the winding shaft 632 to rotate counterclockwise around the winding gear 631 only when the web cleaning unit 600 is taken out is employed.
Specifically, as shown in FIG. 3, the take-up gear 631 has a hole 633 at the center thereof that is rotatably fitted to the take-up roller shaft 632. Two substantially fan-shaped spaces 634 and 635 are formed so as to face the hole 633 and face each other. A pin 670 is attached to the shaft 632 of the winding roller 630, and the pin 670 can move in the fan-shaped spaces 634 and 635 as the shaft 632 rotates.
[0040]
Now, when the drive gear 651 rotates and the rotational force is transmitted to the winding gear 630 via the one-way gear 642 and the transmission gear 641, the winding gear 630 rotates in the direction of the arrow in FIG. 3, and the pin 670 is fan-shaped. The rotation is transmitted to the winding roller shaft 632 by contacting the side walls 672 and 673 of the spaces 634 and 635.
In this way, the web 601 in contact with the surface of the fixing roller 401 is taken up by the take-up roller 630. At this time, the take-up gear 631 meshes with the transmission gear 641 provided with the one-way gear 642, so that it rotates only in the direction of the arrow in the figure, and the reverse rotation is restricted by the one-way gear 642. As a result, the web does not sag.
[0041]
Next, the removal from the fixing device of the cleaning device 600 provided with the winding roller 630 whose rotation is restricted only in one direction by the one-way gear 642 will be described with reference to FIG.
As shown in FIG. 5a, the cleaning device 600 is wound around a guide groove 700 formed in a diagonal direction provided on the front and rear side plates (the rear side plate 702 in the drawing) of the fixing device 400, as shown in FIG. 5a. A take-off shaft 632 is attached. This cleaning unit is fixed to the fixing device main body by means such as screws in a horizontal state as shown in the figure.
Suppose that the cleaning unit has reached the end of its life and will be replaced.
First, the screw fixed to the fixing device main body is removed, and it is rotated clockwise around the winding gear 631 as shown in FIG. 5b. At this time, the take-up gear 631 meshes with the transmission gear 641 fixed coaxially with the one-way gear 642, and does not rotate itself. However, since the winding gear 631 has fan-shaped spaces 634 and 635, the winding shaft 632 can also rotate in the clockwise direction as the unit 600 rotates. In addition, the triangular mark in a figure has shown the rotation state of the winding shaft 632 grade | etc.,.
Thus, when the cleaning unit 600 has been rotated to a state where the engagement between the winding gear 631 and the transmission gear 641 can be released, the unit 600 is fixed by pulling out the winding shaft 632 along the groove 700 formed in the side plate 702. It can be pulled out from the device 400 in the direction of the arrow.
[0042]
Thus, by utilizing the fan-shaped spaces 634 and 635, the winding shaft 632 can be moved without rotating the winding gear 631 meshed with the transmission gear 641 whose rotation is restricted by the one-way gear by a very simple mechanism. By rotating, the meshing between the winding gear 630 and the transmission gear 641 can be released. In this embodiment, the size of one fan-shaped space is about ¼ angle with respect to the center of the take-up gear 631, but it is sufficient that the pin 670 can be rotated when the cleaning unit 600 is taken out. , And can be determined as appropriate according to the apparatus to be used.
[0043]
In the above embodiment, a solenoid is used as a drive source. However, the present invention is not limited to this, and any device can be used as long as it can be brought in as a drive source such as a motor. Further, the winding roller is rotated from the drive source via the gear, but the winding roller may be directly rotated.
[0044]
In the flowchart in the above embodiment, when the count value of the web take-up counter in S12 is not reset (NO in S12), the process returns to S9 to operate the web exchange display instruction means. After setting the count value of the counter to T3 which is a predetermined count value, after returning to S7, the web exchange display instruction means may be operated in S9.
In the above embodiment, an example of a copying machine has been described. However, the present invention can be applied to all image forming apparatuses such as a facsimile and a printer.
[0045]
【The invention's effect】
According to the present invention, since the winding gear is rotatable by a predetermined angle with respect to the winding shaft, even when the one-way clutch is inserted in the drive connecting means of the winding mechanism, the winding gear is taken out when being taken out. And the meshing with the drive gear can be easily released. Therefore, in order to prevent the web from sagging, the web cleaning unit can be easily taken out even when the one-way clutch is attached to the rotation shaft of the transmission gear that transmits the drive from the drive source to the winding gear .
[0047]
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a copying machine to which a fixing device of the present invention is applied. FIG. 2 is a schematic sectional view showing a fixing device. FIG. 3 is a partial perspective view of a cleaning device. Schematic diagram explaining the operation of the winding gear attached to the unit [Explanation of symbols]
1 Copier Main Body 400 Fixing Device 401 Heating Roller 402 Pressure Roller 600 Web Cleaning Unit 601 Web 610 Winding Roller 620 Pressing Roller 630 Winding Roller 631 Winding Gear 641 Transmission Gear 642 One Way Gear 643 One Way Clutch 651 Driving Gear 660 Solenoid ( Drive source)
710 Winding control means 720 Web winding counter 730 Web exchange display instruction means 800 Number counter 810 Maintenance display instruction means 900 Display unit SW discharge switch

Claims (3)

In a fixing device detachably provided with a web cleaning unit that contacts a web impregnated with a release agent with a heating roller to clean the surface of the heating roller.
The web cleaning unit includes a feed roller around which an unused web is wound and a take-up roller that winds up a used web,
A winding gear for transmitting a rotational force to the winding roller is attached to the winding roller shaft so as to be rotatable by a predetermined angle with respect to the winding shaft, and a drive from a drive source is transmitted to the winding gear. And a one-way clutch that is rotatable only in one direction with respect to the drive from the drive source. The fixing device according to claim 1, wherein the winding gear has a pair of substantially fan-shaped spaces facing the rotation center. 2. The fixing device according to claim 1, wherein the winding roller shaft is provided with a pin member at an end thereof for engaging with the fan-shaped space of the winding roller and transmitting driving to the shaft as the winding gear rotates. .

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