JP2008145718A - Driving device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device of a fixing device, which drives a cleaning mechanism and a mechanism to be cleaned, by one driving source and changes members to be driven, in accordance with rotation directions of the driving source to clean the mechanism to be cleaned only when needed. <P>SOLUTION: The driving device of the fixing device, which includes a heat roller 22, a web 33 brought into contact with press contact with the heat roller 22 to clean it, and a take-up roller 35 for taking up the web 33 after cleaning, is provided with a motor 41 capable of changing the rotation direction, a first drive transmission means which comprises a plurality of gears and transmits a drive of the motor 41 to the heat roller 22, and a second drive transmission means which comprises a plurality of gears and transmits the drive of the motor 41 to the take-up roller 35. The second drive transmission means includes a first rotation control member 44 which performs control so as not to transmit the drive to the take-up roller 35 in the case of rotation of the motor 41 in a first direction for stopping the take-up roller 35 and so as to transmit the drive to the take-up roller 35 in the case of rotation of the motor 41 in a second direction for operating the take-up roller 35. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixing device driving device and an image forming apparatus including the same.

In an electrophotographic image forming apparatus, an electrostatic latent image is formed on a photoreceptor, visualized with toner, and then the visualized toner image is transferred onto a transfer sheet. Thereafter, the transfer paper is passed through a fixing device to fix the toner image on the transfer paper.
The fixing device is composed of two rollers, a heating roller having a heat source therein and a pressure roller in pressure contact with the heating roller, and passes through a transfer sheet on which a toner image is transferred to the nip portion of both rollers. Let At this time, the toner image is fixed on the transfer paper by applying pressure while heating with a heating roller.
Here, since the heating roller comes into contact with the unfixed toner, a part of the toner adheres to it, and since it also comes into contact with the transfer paper surface, paper powder and the like also adhere. If the toner or the like fixed on the heating roller adheres to the transfer paper to be fed next, the image is soiled, and even if the toner or the like remains on the heating roller, problems such as offset are likely to occur.
Therefore, it is desirable to clean the heating roller. As a cleaning method, a method of removing foreign matters attached to the heating roller using a heat-resistant web has been conventionally used (see, for example, Patent Documents 1 to 5).

First, the web wound around the delivery roller is taken up by the take-up roller, and cleaning is performed by pressing the web against the heating roller between the delivery roller and the take-up roller.
There are two types of cleaning: the type that cleans while taking up with the take-up roller, and the type that performs cleaning with the take-up roller stationary. Currently, the latter is the mainstream.
As a conventional example of such web feeding, in Patent Document 1, the web winding means is driven independently without being linked with other driving sources such as a heating roller or a main motor of the image forming apparatus. Is performed only for a predetermined period during the operation period of the image forming apparatus.

In addition, in Patent Document 2, the web moving means is connected to the scanning moving body driving means whose moving amount changes according to the copy size of the image forming apparatus through a means that transmits only within a predetermined range. Drives in conjunction with the drive source.
Patent Documents 3 to 5 disclose that a drive mechanism that transmits drive from the drive source to the fixing unit, a second one-way clutch, and that the fixing unit is a fixing belt.
JP 59-84274 A Japanese Utility Model Publication No. 1-88962 JP 2003-091198 A JP 2001-083830 A Japanese Patent Application Laid-Open No. 07-219366

However, in the conventional fixing device cleaning mechanism as described above, the cost is increased by having a separate drive source, and the web is wound up when it is not necessary, and the web is consumed quickly. End up. On the other hand, there is a problem that the web is not taken up when necessary and the cleaning property is deteriorated.
In view of the above, the object of the present invention is to drive the cleaning mechanism and the cleaning mechanism with one driving source, change the driven body according to the rotation direction of the driving source, and perform cleaning only when necessary. Accordingly, it is an object of the present invention to provide a fixing device driving device and an image forming apparatus including the same, which can reduce the cost by reducing the driving source and extend the replacement interval of consumables.

In order to solve the above problems, the invention described in claim 1 is directed to a heating unit that heats and fixes an image formed on a transfer paper, and a cleaning on a sheet that is pressed against the heating unit and cleaned. A driving device that drives a fixing device having a member and a winding unit that winds up the cleaning member that has been cleaned. The driving device includes a driving source capable of switching a rotation direction, and a plurality of gears. First drive transmission means for transmitting the drive to the heating means; and second drive transmission means comprising a plurality of gears and transmitting the drive of the drive source to the winding means; The drive transmission means does not transmit the drive to the winding means when the drive source rotates in the first direction for stopping the winding means, and the drive source operates the winding means. In the second direction for When rolling is characterized drive system including a first rotation restricting member for regulating the second drive transmission means so as to transmit a driving force to the winding roller.
According to a second aspect of the present invention, the first drive transmission means transmits drive to the heating means when the drive source rotates in the first direction, and the drive source is the second drive source. 2. The fixing device drive device according to claim 1, further comprising a second rotation restricting member that restricts the first drive transmission means so that the drive is not transmitted to the heating means when rotating in the direction of. To do.

According to a third aspect of the present invention, in the drive according to the first aspect, the first drive transmission means is configured such that the heating means rotates in the same direction regardless of the rotation direction of the drive source. Features the device.
According to a fourth aspect of the present invention, the reduction ratio is made equal regardless of the rotation of the drive source in the first direction and the second direction, and the heating means is related to the rotation direction of the drive source. The fixing device drive device according to claim 3, wherein the fixing device drive device rotates at the same rotational speed.
According to a fifth aspect of the present invention, there is provided a different reduction ratio when the drive source rotates in the first direction and the second direction, and the heating means rotates differently depending on the rotation direction of the drive source. The fixing device driving device according to claim 3, wherein the fixing device driving device rotates by a number.
According to a sixth aspect of the present invention, there is provided an image forming apparatus including the driving device according to any one of the first to fifth aspects.
According to a seventh aspect of the invention, there is provided the image forming apparatus according to the sixth aspect, wherein the sheet is fed when the driving source rotates in the second direction.
The invention according to claim 8 is characterized in that the image forming apparatus according to claim 6 or 7, wherein the reverse rotation operation of the drive source in the rotation direction is performed during non-sheet passing.

According to the present invention, by driving two or more rotated driving bodies with a single driving source whose rotation direction can be switched, the number of driving sources can be reduced, and cost and space can be saved. Since the drive of the driven body is switched depending on the rotation direction of the drive source, it is possible to provide a drive device that can reduce power consumption and extend the replacement interval of consumables.
Further, according to the present invention, a fixing device that forms an electrostatic latent image on a photosensitive member, visualizes it with toner, transfers the visualized toner image on a transfer paper, and fixes the toner image on the transfer paper. By providing this drive device, it is possible to provide an image forming apparatus capable of reducing costs, saving resources, and saving energy.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing an image forming apparatus provided with a driving device using the present invention. In FIG. 1, a latent image is formed on a photoreceptor 1 by a charging device 2 and a writing device 3, and the latent image is developed by a developing device 4.
The transfer paper (not shown) is conveyed from the paper supply unit 5, timed by the registration unit 6, transferred to the previous toner image by the transfer unit 7, fixed by the fixing device 8, and discharged by the paper discharge unit 9. Released outside the image forming apparatus A.
As will be described later, the fixing device 8 includes a fixing mechanism 21 and a web mechanism 32. The web mechanism 32 is in contact with the heating roller 22 in the fixing mechanism 21, and the heating roller 22 of the fixing mechanism 21 is cleaned by the web 33. Is done. The fixing mechanism 21 and the web mechanism 32 are driven by a motor 41 which is the same drive source.

FIG. 2 is a partial schematic perspective view showing a first embodiment of a fixing device using the present invention. FIG. 3 is a partial schematic perspective view showing the normal rotation of the motor of the first embodiment of the fixing device of FIG. FIG. 4 is a partial schematic perspective view showing the motor of the first embodiment of the fixing device of FIG. 2 during reverse rotation.
2 to 4, the fixing device includes a fixing mechanism 21 and a web mechanism 32, and a heating roller (heating means) 22 and a pressure roller (pressure means) 23 are arranged in the fixing mechanism 21. The heating roller 22 and the pressure roller 23 rotate in conjunction with each other. Even if a fixing belt is used as the heating roller 22 or a pressure belt is used as the pressure roller 23, the driving mechanism of the present invention can be used.
The surface of the heating roller 22 is coated with a heat-resistant release layer such as PFA or PTFE. Further, a heater (not shown) is provided inside the heating roller 22, and the heating roller 22 is maintained at a certain temperature by this heater.
A transfer sheet (not shown) is heated by a fixing drive transmission mechanism (first drive transmission mechanism) 24 to which a rotational drive of a drive source (motor) 41 is transmitted, and pressurization is performed while being in pressure contact with the heating roller 22. The toner is fixed by being conveyed between the rollers 23 and being given heat and pressure at the nip portion between the heating roller 22 and the pressure roller 23.

The web mechanism 32 includes a sheet-like heat-resistant web (cleaning member) 33, a pressing roller 34 that presses the web 33 against the heating roller 22, a winding roller (winding means) 35 that winds the web 33, and the web 33. A delivery roller 36 as supply means is arranged.
The winding roller 35 and the delivery roller 36 rotate in conjunction with each other. Further, a second one-way rotation preventing member (not shown) is attached to the winding roller 35 so that the wound web 33 is not pulled out.
The web 33 is impregnated with a release material, and is pressed against the heating roller 22 by the pressing roller 34 to clean unfixed toner, paper dust, and the like adhering to the heating roller 22 and release the heating roller 22. Apply mold material.
Further, the web 33 is wound up by a winding roller 35 to which rotation is transmitted by a web drive transmission mechanism (first drive transmission mechanism) 37 when necessary, and is supplied by a delivery roller 36, so that a new web is obtained. The part is brought into contact with the heating roller 22 for cleaning.

The motor 41, which is the same drive source for the fixing mechanism 21 (heating roller 22) and the web mechanism 32 (winding roller 35), can rotate forward and reverse, and the fixing drive transmission mechanism 24 and the web drive transmission mechanism 37. The drive is transmitted to.
In the web drive transmission mechanism 37, a gear 40 provided with a one-way clutch 44 (first rotation restricting member) is used as a drive transmission member. The one-way clutch 44 cuts off the driving of the gear 40 when the rotation of the motor 41 is forward (rotation in the first direction) and reverse (revolution in the second direction). To communicate.
Therefore, when the motor 41 rotates in the forward direction, the web drive transmission mechanism 37 blocks the drive to the web mechanism 32 by the one-way clutch 44 as shown in FIG. 3, and the web 33 is pressed against the heating roller 22 in a stopped state. The heating roller 22 rotates in the direction of the arrow.
In this case, the roller surface of the heating roller 22 is rubbed against the web 33, unfixed toner, paper powder, etc. adhering to the heating roller 22 are cleaned, and a release material is applied.

When the motor 41 rotates in the reverse direction, as shown in FIG. 4, the web drive transmission mechanism 37 transmits the drive to the web mechanism 32, the web 33 is wound around the winding roller 35, and the heating roller 22 is moved to the arrow. Rotate in the direction of.
In this case, the web 33 and the heating roller 22 move in the same direction at the contact portion, the frictional force is reduced, and the load on the motor 41 is reduced. 2 to 4, reference numerals 25 to 31 denote rotating bodies (gears) constituting the fixing drive transmission mechanism 24, reference numerals 38 and 39 denote gears constituting the web drive transmission mechanism 37, and reference numerals 42 and 43 denote motors. A rotating body related to 41 is shown.
By using the one-way clutch 44, compared to a drive transmission switching mechanism that cuts off the transmission of the clutch and the like, it is possible to improve durability such as loss of gears due to a collision, and to change to an inexpensive material, thereby eliminating the collision. The collision sound can be eliminated.
Regardless of the rotation direction of the drive source (motor) 41, the heating roller 22 rotates in the same direction, so that the web 33 can be wound while the heating roller 22 is being cleaned. As a result, the heating roller 22 is cleaned while the web 33 coming into contact with the heating roller 22 becomes a new location at any time, and the cleaning performance of the heating roller 22 can be improved.

The heating roller 22 rotates at the same rotation speed regardless of the rotation direction of the motor (drive source) 41 by equalizing the reduction ratio at the time of forward rotation and reverse rotation.
The fixing roller drive transmission mechanism is configured such that the heating roller 22 rotates in the same direction regardless of the rotation direction of the motor 41, and the reduction ratio during forward rotation and reverse rotation is made equal to fix the web 33 while winding it. By passing the paper through the apparatus, it becomes possible to fix the unfixed toner on the recording material.
As a result, it is not possible to pass the heating roller 22 in order to wind the web 33, and the motor 41 can be used while the fixing device is not passing, such as when a plurality of sheets are passed at once. By switching between normal rotation and reverse rotation, the web 33 can be wound up without stopping the paper feeding. Further, it is not necessary to drive the web 33 just to wind it up, and energy saving can be achieved.
Further, the heating roller 22 rotates at a different number of rotations depending on the rotation direction of the motor (drive source) 41 by changing the reduction ratio during forward rotation and reverse rotation. Regardless of the rotation direction of the motor 41, the heating roller 22 rotates in the same direction, and changes the reduction ratio between forward rotation and reverse rotation, so that the fixing device is rotated by a desired number of rotations while the web 33 is being wound. It can be rotated. Further, the relative speed ratio of the heating roller 22 to the web 33 can be increased by increasing the number of rotations of the heating roller 22 during reverse rotation. From these things, it becomes possible to improve the cleaning property of the heating roller 22.

FIG. 5 is a partial schematic perspective view showing a second embodiment of a fixing device using the present invention. FIG. 6 is a partial schematic perspective view showing only the motor shaft with the second embodiment of the fixing device of FIG. 5 as a motor. FIG. 7 is a partial schematic perspective view showing the forward rotation of the motor of the second embodiment of the fixing device of FIG. FIG. 8 is a partial schematic perspective view showing the second embodiment of the fixing device of FIG. 5 during reverse rotation of the motor.
Referring to FIGS. 5 to 8, the motor 41, which is the same drive source for the fixing mechanism 21 and the web mechanism 32, can rotate forward and reverse, and the fixing drive transmission mechanism 24 and the web drive transmission mechanism 37 are connected to each other. The drive is transmitted.
In the web drive transmission mechanism 37, a gear 52 provided with a one-way clutch 53 as a first rotation restricting member is used as a drive transmission member. The one-way clutch 53 cuts off the drive with the gear 52 when the rotation of the motor 41 is normal and transmits when the motor 41 is reverse.

Therefore, when the motor 41 is rotating forward, the web drive transmission mechanism 37 is blocked from driving the web mechanism 32 by the one-way clutch 53 as shown in FIG. 7, and the web 33 is pressed against the heating roller 22 in a stopped state. The heating roller 22 rotates in the direction of the arrow.
In this case, the roller surface of the heating roller 22 is rubbed against the web 33, unfixed toner, paper powder, etc. adhering to the heating roller 22 are cleaned, and a release material is applied.
When the motor 41 rotates in the reverse direction, as shown in FIG. 8, the web drive transmission mechanism 37 transmits the drive to the web mechanism 32, the web 33 is taken up by the take-up roller 35, and the heating roller 22 is indicated by the arrow. Rotate in the direction.
In this case, the web 33 and the heating roller 22 move in the same direction at the contact portion, the frictional force is reduced, and the load on the motor 41 is reduced. 5 to 8, reference numerals 45 to 51 denote rotating bodies that constitute the fixing drive transmission mechanism 24, and reference numerals 54 to 57 denote rotating bodies that constitute the web drive transmission mechanism 37.

FIG. 9 is a partial schematic perspective view showing a third embodiment of a fixing device using the present invention. FIG. 10 is a partial schematic perspective view showing the motor of the third embodiment of the fixing device of FIG. 9 during normal rotation. FIG. 11 is a partial schematic perspective view showing the third embodiment of the fixing device of FIG. 9 during reverse rotation of the motor.
With reference to FIGS. 9 to 11, the motor 41, which is the same drive source for the fixing mechanism 21 and the web mechanism 32, is capable of normal rotation and reverse rotation, and the fixing drive transmission mechanism 24 and the web drive transmission mechanism 37 are connected to each other. The drive is transmitted.
Further, in the fixing drive transmission mechanism 24 and the web drive transmission mechanism 37, one-way clutches 58 (second rotation restriction members), 66, 68 (first rotation restriction members) are respectively connected to the gears 59, 66, 69. It is provided and used as a drive transmission member.
The one-way clutch 58 transmits the drive with the gear 59 when the rotation of the motor 41 is forward (FIG. 10) and is interrupted when the motor 41 is reverse (FIG. 11). The one-way clutch 68 cuts off the drive with the gear 69 when the rotation of the motor 41 is normal and transmits when the motor 41 is reverse. The one-way clutch 66 cuts off the drive with the gear 61 when the rotation of the motor 41 is normal and transmits when the motor 41 is reverse.

Therefore, when the motor 41 is rotating forward, as shown in FIG. 10, the web drive transmission mechanism 37 cuts off the drive to the web mechanism 32 by the one-way clutches 68 and 66, and the web 33 is pressed against the heating roller 22 in a stopped state. The heating roller 22 rotates in the direction of the arrow.
In this case, the roller surface of the heating roller 22 is rubbed against the web 33, unfixed toner, paper powder, etc. adhering to the heating roller 22 are cleaned, and a release material is applied.
When the motor 41 rotates in the reverse direction, as shown in FIG. 11, the web drive transmission mechanism 37 transmits the drive to the web mechanism 32, and the web 33 is wound around the winding roller 35. The heating roller 22 is blocked from driving from the one-way clutch 58, but the driving from the one-way clutch 66 is transmitted to the gear 61 and rotates in the direction of the arrow.
In this case, the heating roller 22 rotates in the same direction as the motor 41 during normal rotation, and presses unfixed toner, paper dust, etc. adhering to the heating roller 22 caused by rotating in the reverse direction. Adhesion to the roller 23 can be prevented.
9 to 11, reference numerals 60, 62 to 65, and 67 denote rotating bodies that constitute the fixing drive transmission mechanism 24, reference numerals 70 and 71 denote rotating bodies that constitute the web drive transmission mechanism 37, and reference numerals 72 and 73. Indicates a rotating body related to the motor 41.

FIG. 12 is a partial schematic perspective view showing a fourth embodiment of a fixing device using the present invention. FIG. 13 is a partial schematic perspective view showing the motor of the fourth embodiment of the fixing device of FIG. 12 during normal rotation. FIG. 14 is a partial schematic perspective view illustrating the fourth embodiment of the fixing device of FIG. 12 during reverse rotation of the motor.
Referring to FIGS. 12 to 14, the motor 41, which is the same drive source for the fixing mechanism 21 and the web mechanism 32, can rotate forward and reverse, and the fixing drive transmission mechanism 24 and the web drive transmission mechanism 37 are connected to each other. The drive is transmitted.
Further, a gear 75 provided with a one-way clutch 74 as a second rotation restricting member is provided in the fixing drive transmission mechanism 24, and a one-way clutch 82 as a first rotation restricting member is provided in the web drive transmission mechanism 37. Each of the gears 83 provided with is used as a drive transmission member.
The one-way clutch 74 transmits the drive with the gear 75 when the rotation of the motor 41 is forward (FIG. 13) and is interrupted when the motor 41 is reverse (FIG. 14). The one-way clutch 82 cuts off the drive with the gear 83 when the rotation of the motor 41 is normal and transmits when the motor 41 is reverse. Therefore, when the motor 41 is rotating forward, as shown in FIG. 13, the web drive transmission mechanism 37 blocks the drive to the web mechanism 32 by the one-way clutch 82, and the web 33 is pressed against the heating roller 22 in a stopped state. The heating roller 22 rotates in the direction of the arrow.
In this case, the roller surface of the heating roller 22 is rubbed against the web 33, unfixed toner, paper powder, etc. adhering to the heating roller 22 are cleaned, and a release material is applied.

When the motor 41 rotates in the reverse direction, as shown in FIG. 14, the web drive transmission mechanism 37 transmits the drive to the web mechanism 32, the web 33 is wound around the winding roller 35, and the heating roller 22 is one-way. The drive to the fixing mechanism 21 is cut off by the clutch 74 and is pressed against the web 33 in a stopped state. In this case, the motor 41 drives only the web 33, leading to a reduction in torque.
The heating roller 22 rotates when the motor 41 rotates forward and stops when the motor 41 rotates backward. Thus, the required torque of the motor 41 can be reduced by not transmitting the drive to the heating roller 22 when the web 33 is wound.
By providing a one-way clutch 74 as a second rotation restricting member in the fixing drive transmission mechanism connected to the heating roller 22, the reverse rotation of the heating roller 22 is prevented, and unfixed toner, paper dust, etc. adhering to the heating roller 22 are removed. Therefore, it is possible to prevent the pressure roller 23 from moving.

A drive transmission mechanism other than the above-described drive transmission mechanism is provided on the driven drive body other than the winding roller 35 and the heating roller 22, and the driven drive body is either forwardly or reversely rotated by the motor 41. It is configured to rotate only in the case of. By transmitting the drive from the motor (drive source) 41 to another drive body, it is possible to further reduce the drive sources, thereby reducing the cost and space.
The driving apparatus of the present invention having the above-described effects on an image forming apparatus that forms an electrostatic latent image on the photoreceptor 1 (FIG. 1), visualizes it with toner, and then transfers the visualized toner image onto a transfer sheet. By providing the image forming apparatus, it is possible to provide an image forming apparatus capable of reducing cost, saving resources, and saving energy.
By passing the paper while winding the web, it is not possible to pass the paper to the heating roller 22 for winding the web, and even when fixing a plurality of sheets continuously, the paper is not passed. The reversing operation is performed at the timing, and the web can be taken up without stopping the paper feeding on the way.
Further, it is not necessary to drive the web only for winding, and energy saving can be achieved. Furthermore, by performing reverse rotation when not passing paper, it is possible to replace the web that contacts the heating roller 22 with a new location before passing paper.

1 is a schematic diagram illustrating an image forming apparatus including a driving device using the present invention. 1 is a partial schematic perspective view showing a first embodiment of a fixing device using the present invention. FIG. 3 is a partial schematic perspective view showing the motor of the first embodiment of the fixing device of FIG. 2 during normal rotation. FIG. 3 is a partial schematic perspective view showing a motor reverse rotation of the first embodiment of the fixing device of FIG. 2. FIG. 5 is a partial schematic perspective view showing a second embodiment of a fixing device using the present invention. FIG. 6 is a partial schematic perspective view showing only a motor shaft using the second embodiment of the fixing device of FIG. 5 as a motor. FIG. 6 is a partial schematic perspective view showing the motor of the second embodiment of the fixing device in FIG. 5 during normal rotation. FIG. 6 is a partial schematic perspective view showing the second embodiment of the fixing device of FIG. 5 during reverse rotation of the motor. FIG. 9 is a partial schematic perspective view showing a third embodiment of a fixing device using the present invention. FIG. 10 is a partial schematic perspective view showing the motor of the third embodiment of the fixing device in FIG. 9 during normal rotation. FIG. 10 is a partial schematic perspective view showing the third embodiment of the fixing device of FIG. 9 during reverse rotation of the motor. FIG. 10 is a partial schematic perspective view showing a fourth embodiment of a fixing device using the present invention. FIG. 13 is a partial schematic perspective view showing the motor of the fourth embodiment of the fixing device in FIG. 12 during normal rotation. FIG. 13 is a partial schematic perspective view showing the fourth embodiment of the fixing device of FIG. 12 during reverse rotation of the motor.

Explanation of symbols

  A image forming apparatus, 1 photosensitive member, 4 developing device, 7 transfer unit, 8 fixing device, 21 fixing mechanism, 22 heating roller, 23 pressure roller, 24 fixing drive transmission mechanism, 25 gear, 32 web mechanism, 33 web, 34 Pressing roller 35 Winding roller, 36 Sending roller, 37 Web drive transmission mechanism, 40 gear, 41 motor, 44 Rotation restricting member, 52 gear, 53 one-way clutch, 58 one-way clutch, 59 gear, 74 one-way clutch, 75 gear

Claims (8)

A heating unit that heats and fixes the image formed on the transfer paper; a cleaning member on the sheet that is pressed against the heating unit to perform cleaning; and a winding unit that winds up the cleaning member that has been cleaned; In a driving device for driving a fixing device having
A drive source capable of switching the rotation direction, a first drive transmission means comprising a plurality of gears for transmitting the drive of the drive source to the heating means, a plurality of gears comprising the gears on the winding means A second drive transmission means for transmitting the drive of the drive source,
The second drive transmission means does not transmit drive to the winding means when the drive source rotates in a first direction for stopping the winding means, and the drive source does not take up the winding means. And a first rotation restricting member for restricting the second drive transmission means so as to transmit the drive to the winding roller when rotating in the second direction for operating the drive. apparatus.   The first drive transmission means transmits drive to the heating means when the drive source rotates in the first direction, and to the heating means when the drive source rotates in the second direction. The drive device according to claim 1, further comprising a second rotation restricting member that restricts the first drive transmission means so as not to transmit the drive.   2. The drive device according to claim 1, wherein the first drive transmission unit is configured such that the heating unit rotates in the same direction regardless of the rotation direction of the drive source.   The reduction ratio is made equal regardless of when the drive source rotates in the first direction and the second direction, and the heating means rotates at the same rotation speed regardless of the rotation direction of the drive source. The drive device according to claim 3.   The reduction ratio when the drive source is rotated in the first direction and the second direction is made different so that the heating unit rotates at a different rotation speed depending on the rotation direction of the drive source. The drive device according to claim 3.   An image forming apparatus comprising the driving device according to claim 1.   The image forming apparatus according to claim 6, wherein the sheet is fed when the driving source rotates in the second direction.   The image forming apparatus according to claim 6, wherein the rotation direction of the drive source is reversed when the sheet is not fed.

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