JP5311185B2 - Powder conveying apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a powder conveying apparatus and an image forming apparatus.

  Patent Documents 1 to 4 disclose an abnormality detection device for a copying machine provided with a detection member that detects whether the driven or drive side gear shaft can be displaced when the load of toner recovery exceeds a certain value. To do.

Japanese Unexamined Patent Publication No. 63-239481 JP-A 64-585 Japanese Unexamined Patent Publication No. 64-577 JP-A 64-586

  The present invention relates to a powder conveying apparatus and an image forming apparatus that can prevent a load from being applied to a driving force transmitting member that transmits a driving force to a conveying member that conveys powder, and can convey the powder satisfactorily. An object is to provide an apparatus.

  In order to achieve the above object, the present invention according to claim 1 is provided with a cylindrical member through which powder can pass, and is provided in the cylindrical member so as to extend in substantially the same direction as the cylindrical member, and rotates. A conveying member that conveys the powder in a direction in which the cylindrical member extends, a driving force transmission member that is provided at an end of the conveying member and transmits a driving force so that the conveying member rotates, and the cylinder A fixed member to which a part of the cylindrical member is fixed, the conveying member does not contact the inner surface of the cylindrical member, and the driving force transmitting member satisfies a predetermined meshing condition. It is a powder conveying apparatus which is provided with play with respect to the fixed member.

  The present invention according to claim 2 is the powder conveying apparatus according to claim 1, wherein the cylindrical member is supported by providing play with respect to the fixed member.

  According to a third aspect of the present invention, the cylindrical member is connected to the first component member fixed to the fixed member, and downstream of the first component member in the powder conveyance direction, The powder conveying apparatus according to claim 1 or 2, comprising a second component member that is supported by being provided with play with respect to the fixed member.

  According to a fourth aspect of the present invention, the conveying member comprises a rotating shaft driven by the driving force transmitting member, and a spiral blade provided around the rotating shaft. It is a powder conveying device.

  The present invention according to claim 5 is the powder conveying apparatus according to any one of claims 1 to 4, wherein the conveying member is supported by a bearing on an end side provided with the driving force transmitting member.

  According to a sixth aspect of the present invention, there is provided an image carrier that holds a toner image, an image forming apparatus main body that accommodates the image carrier, a peeling unit that peels off toner remaining on the image carrier, and the image formation. A toner cartridge which is detachably attached to the apparatus main body and receives the toner peeled off by the peeling means; and a toner transport device which transports the toner peeled off by the peeling means to the toner cartridge. A cylindrical member that can pass through, and a conveying member that is provided in the cylindrical member so as to extend in substantially the same direction as the cylindrical member, and conveys toner in a direction in which the cylindrical member extends by rotating. A driving force transmitting member that is provided at an end of the conveying member and transmits a driving force so that the conveying member rotates; and a fixed member to which a part of the cylindrical member is fixed; The image forming apparatus is supported with play provided to the fixed member so that the conveying member does not contact the inner surface of the cylindrical member and the driving force transmitting member satisfies a predetermined meshing condition. It is.

  7. The image forming apparatus according to claim 7, further comprising a driving unit that drives the image holding member to rotate, and the driving force transmission member transmits a driving force of the driving unit. It is.

  According to an eighth aspect of the present invention, in the image forming apparatus according to the sixth or seventh aspect, the tubular member is supported by providing play with respect to the fixed member.

  According to a ninth aspect of the present invention, the cylindrical member is connected to the first component member fixed to the member to be fixed, and to the downstream side in the toner transport direction with respect to the first component member. The image forming apparatus according to claim 6, further comprising a second component member that is supported by play provided to the fixing member.

  According to a tenth aspect of the present invention, in the conveyance device according to any one of the sixth to ninth aspects, the conveying member includes a rotating shaft driven by the driving force transmitting member and a spiral blade provided around the rotating shaft. An image forming apparatus.

  According to an eleventh aspect of the present invention, in the image forming apparatus according to any one of the sixth to tenth aspects, the conveying member is supported by a bearing on an end portion side where the driving force transmitting member is provided.

  According to the first aspect of the present invention, an overload is applied to the driving force transmission member that transmits the driving force to the conveying member that conveys the powder as compared with the case where the present configuration is not provided. It is possible to prevent and transport the powder satisfactorily.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the driving force is transmitted to the conveying member that conveys the powder as compared with the case where the present configuration is not provided. It is possible to prevent the driving force transmission member from being overloaded and to transport the powder satisfactorily.

  According to the third aspect of the present invention, in addition to the effect of the present invention according to the first or second aspect, the driving force is applied to the conveying member that conveys the powder as compared with the case where the present configuration is not provided. It is possible to prevent an overload from being applied to the driving force transmission member to be transmitted and to transport the powder satisfactorily.

  According to the fourth aspect of the present invention, in addition to the effect of the present invention according to any one of the first to third aspects, the powder can be transported better than in the case where the present configuration is not provided. it can.

  According to the fifth aspect of the present invention, in addition to the effect of the present invention according to any one of the first to fourth aspects, it is driven by the conveying member that conveys the powder as compared with the case where the present configuration is not provided. It is possible to prevent the overload from being applied to the driving force transmission member that transmits the force and to transport the powder satisfactorily.

  According to the sixth aspect of the present invention, compared with the case where the present configuration is not provided, the driving force transmitting member that transmits the driving force to the conveying member that conveys the toner separated from the image carrier is excessively transmitted. It is possible to prevent the load from being applied and to transport the toner satisfactorily.

  According to the seventh aspect of the present invention, in addition to the effect of the present invention according to the sixth aspect, it is possible to prevent the toner image held by the image holding member from being damaged and to transport the toner satisfactorily. it can.

  According to the eighth aspect of the present invention, in addition to the effect of the present invention according to the sixth or seventh aspect, the driving force is transmitted to the conveying member that conveys the toner as compared with the case where the present configuration is not provided. Thus, it is possible to prevent the overload from being applied to the driving force transmission member and to transport the toner satisfactorily.

  According to the ninth aspect of the present invention, in addition to the effect of the present invention according to any one of the sixth to eighth aspects, the driving force is applied to the conveying member that conveys the toner as compared with the case where the present configuration is not provided. Therefore, it is possible to prevent the overload from being applied to the driving force transmitting member that transmits the toner and to transport the toner satisfactorily.

  According to the tenth aspect of the present invention, in addition to the effects of the present invention according to any one of the sixth to ninth aspects, the powder can be transported better than when the present configuration is not provided. it can.

  According to the eleventh aspect of the present invention, in addition to the effect of the present invention according to any one of the sixth to tenth aspects, the driving force is applied to the conveying member that conveys the toner as compared with the case where the present configuration is not provided. Therefore, it is possible to prevent the overload from being applied to the driving force transmitting member that transmits the toner and to transport the toner satisfactorily.

Next, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an outline of an image forming apparatus 10 according to an embodiment of the present invention. The image forming apparatus 10 includes an image forming apparatus main body 12, an image forming unit 14 in the image forming apparatus main body 12, a sheet supply device 54 that supplies sheets to the image forming unit 14, a power supply unit 16, A control unit 68 having a CPU and the like (not shown) is provided. The control unit 68 controls each unit constituting the image forming apparatus 10. Further, a sheet discharge unit 15 for discharging a sheet on which an image has been formed is provided on the upper part of the image forming apparatus main body 12.

  The image forming unit 14 is an electrophotographic system that forms a color image, and uniformly holds the image carriers 22Y, 22M, 22C, and 22B that hold toner images and the image carriers 22Y, 22M, 22C, and 22B. Charging devices 24Y, 24M, 24C, and 24B equipped with charging rolls for charging, and optical writing devices 26Y, 26M, 26C, and 26B for writing electrostatic latent images to the respective image carriers 22Y, 22M, 22C, and 22B with light, The developing devices 28Y, 28M, 28C, and 28B for developing the latent images written on the respective image carriers 22Y, 22M, 22C, and 22B using a two-component developer composed of a non-magnetic toner and a magnetic carrier. A transfer unit 42 that transfers the toner images formed on the image carriers 22Y, 22M, 22C, and 22B to a sheet, and the transfer of the toner image by the transfer unit 42. The image carrier 22Y after being has 22M, 22C, scraped waste toner remaining for example 22B (peeling with) cleaning collecting devices 30Y, 30M, 30C, and 30B.

  Each of the optical writing devices 26Y, 26M, 26C, and 26B includes a laser exposure device. The optical writing device 26Y applies laser light corresponding to the yellow image to the image carrier 22Y, and the optical writing device 26M provides a magenta image to the image carrier 22M. The optical writing device 26C emits laser light corresponding to the cyan image to the image holding member 22C, and the optical writing device 26B emits laser light corresponding to the black image to the image holding member 22B. Electrostatic latent images are written in 22Y, 22M, 22C, and 22B, respectively.

  Among the members of the image forming unit 14, the image carriers 22Y, 22M, 22C, and 22B, the charging devices 24Y, 24M, 24C, and 24B, the developing devices 28Y, 28M, 28C, and 28B, and the cleaning devices 30Y, 30M, 30C, and 30B The image forming unit 32 is used as an exchange unit, and is integrated with the image forming apparatus main body 12 so as to be detachable from the front side (left side in FIG. 1).

  The image carrier 22Y, the charging device 24Y, and the cleaning device 30Y are integrated to form an image carrier unit 90 described later. Similarly, the image carriers 22M, 22C, and 22B are integrated for each color of the corresponding image together with the charging devices 24M, 24C, and 24B and the cleaning devices 30M, 30C, and 30B to form an image carrier unit. The developing devices 28Y, 28M, 28C, and 28B are detachably attached to the image forming unit 32, respectively.

Further, in the image forming unit 32, toner cartridges 34Y, 34M, 34C, and 34B as replacement units that respectively store toner supplied to the developing devices 28Y, 28M, 28C, and 28B are provided to the image forming apparatus main body 12. It is detachably mounted from the side.
The toner cartridges 34Y, 34M, 34C, and 34B have toner cartridge bodies 35Y, 35M, 35C, and 35B, respectively, and toner storage chambers 36Y, 36M, and 36C that store toner in the toner cartridge bodies 35Y, 35M, 35C, and 35B. 36B and waste toner storage chambers 38Y, 38M, 38C, and 38B are formed, respectively, and toner is supplied to the developing devices 28Y, 28M, 28C, and the like through a toner supply path (not shown) provided in the image forming apparatus main body 12, respectively. Supply to 28B. For example, the toner cartridge 34Y is filled (contained) with yellow toner, the toner cartridge 34M with magenta toner, the toner cartridge 34C with cyan toner, and the toner cartridge 34B with black toner. The waste toner storage chambers 38Y, 38M, 38C, and 38B store the waste toner collected from the image carriers 22Y, 22M, 22C, and 22B.
The toner cartridges 34Y, 34M, 34C, and 34B are each provided with, for example, a remaining amount detection sensor or a density sensor (not shown), and the control unit 68 detects (calculates) the remaining amount of toner. Have been able to.

  The transfer unit 42 is disposed so as to be in contact with the image carriers 22Y, 22M, 22C, and 22B of the image forming unit 32. The transfer unit 42 is integrated as a unit, and includes two support rolls 44a and 44b, a conveyance belt 46 that conveys a sheet or toner image, an adsorption roll 48 that adsorbs the sheet to the conveyance belt 46, and a conveyance belt. The transfer rolls 50Y, 50M, 50C, and 50B for transferring the toner images formed on the respective image holding members 22Y, 22M, 22C, and 22B are mounted on the sheet being conveyed by 46.

  The suction roll 48 is provided in pressure contact with the support roll 44 a via the transport belt 46, and a voltage is applied from the power supply unit 16 to electrostatically attract the sheet to the transport belt 46.

  The transfer rolls 50Y, 50M, 50C, and 50B are each applied with a transfer bias, and sequentially transfer the toner images formed on the image carriers 22Y, 22M, 22C, and 22B onto the sheet being conveyed by the conveyance belt 46. A color toner image in which four color toner images of yellow, magenta, black and cyan are superimposed on the sheet is formed.

  A fixing device 52 for fixing the toner image transferred onto the sheet by the transfer unit 42 to the sheet is provided at the upper part in the image forming apparatus main body 12. The fixing device 52 includes a heating roll 52a and a pressure roll 52b. The toner image is fixed on the sheet by heating and pressing the sheet passing between the heating roll 52a and the pressure roll 52b. ing.

  The image forming apparatus main body 12 is provided with a conveyance path 60 that conveys the sheet supplied from the sheet supply apparatus 54 to the sheet discharge unit 15, and along the conveyance path 60, upstream in the sheet conveyance direction. A resist roll 62, a transfer unit 42, a fixing device 52, and a discharge roll 64 are arranged in this order. The discharge roll 64 discharges the sheet conveyed from the fixing device 52 to the sheet discharge unit 15.

  The image forming apparatus main body 12 is provided with a user interface (UI) unit 70 at the upper part on the front side, and an opening / closing cover 72 for opening and closing the opening 78 on one side surface. The UI unit 70 is, for example, a touch panel or the like. The UI unit 70 receives an operator's input and outputs it to the control unit 68, and performs a predetermined display according to the control of the control unit 68. An opening / closing lever 74 is provided on the outer surface of the opening / closing cover 72. The opening / closing lever 74 is gripped by an operator to open and close the opening / closing cover 72 and is provided toward the inside of the image forming apparatus main body 12 by, for example, circular movement in the forward / reverse direction about the vertical direction by the operator. The hook 76 is circularly moved in forward and reverse directions. The hook 76 keeps the open / close cover 72 closed by engaging with the image forming apparatus main body 12 according to forward and reverse circular movements, and the engagement with the image forming apparatus main body 12 is released. The opening / closing cover 72 can be opened.

  When the opening / closing cover 72 is opened, the toner cartridges 34Y, 34M, 34C, and 34B are opened on the front side (the left front side in FIG. 2) through the opening 78 provided on one side surface of the image forming apparatus main body 12. A part of is exposed. The toner cartridges 34Y, 34M, 34C, 34B are each provided with a grip 80 on the front side, and are held by the cartridge holders 82 so that the side faces the opening / closing cover 72 when the opening / closing cover 72 is closed. Has been.

The cartridge holder 82 is configured such that when the opening / closing cover 72 is closed, the claw portions 84 protrude from the back side of the side surface facing the opening / closing cover 72. Each of the claw portions 84 is engaged with a receiving portion 86 provided inside the opening / closing cover 72 in a predetermined case so as to connect the cartridge holder 82 and the opening / closing cover 72.
The periphery of the image carriers 22Y, 22M, 22C, and 22B and the toner cartridges 34M, 34C, and 34B are configured in substantially the same manner except that the toner colors are different. Therefore, hereinafter, the periphery of the image carrier 22Y and the toner cartridge 34Y will be described.

FIG. 3 is a perspective view showing the image carrier unit 90Y including the image carrier 22Y and the toner cartridge 34Y.
FIG. 4 is a perspective view showing a drive system in the image carrier unit 90Y.
The toner cartridge 34Y is formed such that a toner storage chamber 36Y and a waste toner storage chamber 38Y that are separated from each other are aligned in the longitudinal direction. The toner storage chamber 36Y is connected to the developing device 28Y via a toner supply path (not shown). The waste toner storage chamber 38Y is disposed closer to the image carrier unit 90Y than the toner storage chamber 36Y, and is provided with an opening 92Y to which a second waste toner transport path 104Y described later is connected.

  The image carrier unit 90Y is a unit that holds the image carrier 22Y, the charging device 24Y, the cleaning device 30Y, and the like by the unit main body 93Y, and has a cylindrical first waste toner conveyance path 94Y through which waste toner can pass. Is provided, and a second waste toner conveyance path 104Y described later is provided in a direction substantially orthogonal to the first waste toner conveyance path 94Y. That is, the image carrier unit 90Y is also a waste toner conveying device.

  The first waste toner transport path 94Y includes a first waste toner transport member 96Y that transports the waste toner collected by the cleaning device 30Y. The first waste toner conveying member 96Y includes a rotation shaft 97a and a spiral blade 97b provided around the rotation shaft 97a. A driving gear 98Y is fixed to one end of the first waste toner conveying member 96Y. The drive gear 98Y transmits the driving force of the drive gear 100Y provided at one end of the image carrier 22Y to the first waste toner transport member 96Y. The drive gear 100Y is rotated by the drive force of the drive unit 102. That is, when the driving gear 100Y and the driving gear 98Y transmit the driving force of the driving unit 102, the first waste toner conveying member 96Y rotates, and the waste toner collected by the cleaning device 30Y is transferred to the first waste toner conveying member. 96Y conveys substantially parallel to the image carrier 22Y and conveys the waste toner to the second waste toner conveyance path 104Y on the toner cartridge 34Y side.

  The second waste toner transport path 104Y is a cylindrical member through which the waste toner can pass, and is connected in a direction substantially orthogonal to the first waste toner transport path 94Y, with respect to the toner cartridge 34Y. The waste toner can be connected between the first waste toner transport path 94Y and the toner cartridge 34Y. A second waste toner transport member 106Y is provided in the second waste toner transport path 104Y. The second waste toner conveying member 106Y includes a rotating shaft 107a and a spiral blade 107b provided around the rotating shaft 107a, and a drive gear 108Y is provided at an end portion on the first waste toner conveying member 96Y side. Is provided. The drive gear 108Y is configured to transmit the driving force of the drive gear 110Y provided at the end of the image carrier 22Y on the second waste toner conveyance path 104Y via the gear 112Y. In other words, the second waste toner transport member 106Y transmits the driving force for rotating the image carrier 22Y via the drive gear 108Y, so that the waste toner transported by the first waste toner transport member 96Y is transferred to the toner cartridge. Transport toward 34Y.

FIG. 5 is a cross-sectional view showing the second waste toner conveyance path 104Y and its periphery.
The second waste toner transport path 104Y is connected to the first component member 114Y fixed to the unit main body 93Y, with play provided downstream of the first component member 114Y in the waste toner transport direction. The second main component 116Y is supported by a play provided to the unit main body 93Y.
Here, in the second waste toner transport path 104Y and the second waste toner transport member 106Y, the second waste toner transport member 106Y does not contact the inner surface of the second waste toner transport path 104Y, and the drive gear 108Y. Are provided and supported with respect to the unit main body 93Y so as to satisfy a predetermined meshing condition.

  The second component member 116Y is provided with a discharge port 118Y for discharging waste toner to the toner cartridge 34Y on the end side to which the toner cartridge 34Y is connected. The discharge port 118Y opens and closes when the shutter 122Y urged by an elastic member 120Y such as a spring moves. When the toner cartridge 34Y is connected to the second waste toner conveyance path 104Y, the elastic member 120Y moves the shutter 122Y toward the first component 114Y to open the discharge port 118Y, and the toner cartridge 34Y When the toner is removed from the waste toner conveyance path 104Y, the shutter 122Y moves to close the discharge port 118Y.

The second waste toner transport member 106Y is supported by a discharge member 118Y on the discharge port 118Y side with play, and a bearing 126Y disposed in the first component member 114Y on the end side where the drive gear 108Y is provided. Is supported by
The first component 114Y is provided with screw holes 128a and 128b above and below the bearing 126Y, and can be screwed (fixed) together with screw holes 128c and 128d described later.

Next, the connection between the unit main body 93Y and the second waste toner conveyance path 104Y will be described.
FIG. 6 is a perspective view showing a connection method between the unit main body 93Y and the second waste toner conveyance path 104Y.
The unit main body 93Y is provided with screw holes 128c and 128d so as to face the screw holes 128a and 128b of the second waste toner conveyance path 104Y.
Further, the second constituent member 116Y of the second waste toner conveyance path 104Y is provided with a boss 130 in the vicinity of a portion connected to the first constituent member 114Y so as to face the unit main body 93Y. A boss hole 132 is provided in the unit main body 93 </ b> Y so as to face the boss 130. The boss hole 132 is formed so that the boss 130 is supported with a predetermined play.

In the second waste toner conveyance path 104Y, the screw holes 128a and 128c are screwed, the screw holes 128b and 128d are screwed, and the drive gear 108Y side is fixed, and the boss 130 is provided with play. And connected to the unit main body 93Y so as to be supported by the boss hole 132. That is, the second waste toner transport path 104Y and the second waste toner transport member 106Y are supported with play provided to the unit main body 93Y.
Therefore, even when the second waste toner transport member 106Y transports waste toner, even if it receives an excessive load due to the waste toner, the drive gear 108Y is not excessively loaded. Further, unnecessary force is not applied from the second waste toner conveying member 106Y to the image carrier 22Y. Further, since the second waste toner conveyance path 104Y is provided with play and is connected to the unit main body 93Y, the toner cartridge 34Y can be easily connected even when the toner cartridge 34Y is connected to the image carrier unit 90Y. become.

1 is a cross-sectional view seen from a side showing an outline of an image forming apparatus according to an embodiment of the present invention. 1 is a perspective view illustrating a state in which an opening / closing cover of an image forming apparatus according to an embodiment of the present invention is opened. FIG. 3 is a perspective view illustrating an image carrier unit including an image carrier and a toner cartridge. It is a perspective view which shows the drive system in an image holding body unit. FIG. 6 is a cross-sectional view showing a second waste toner conveyance path and its periphery. FIG. 6 is a perspective view illustrating a method for connecting a unit main body and a second waste toner conveyance path.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Image forming apparatus main body 14 Image forming part 22Y, 22M, 22C, 22B Image holding body 28Y, 28M, 28C, 28B Developer 34Y, 34M, 34C, 34B Toner cartridge 35Y, 35M, 35C, 35B Toner cartridge Main body 36Y, 36M, 36C, 36B Toner storage chamber 38Y, 38M, 38C, 38B Waste toner storage chamber 90Y Image carrier unit 92Y Opening 93Y Unit main body 94Y First waste toner transport path 97a Rotating shaft 97b Spiral blade 96Y First Waste toner transport member 98Y, 100Y drive gear 102 drive unit 104Y second waste toner transport path 106Y second waste toner transport member 107a rotating shaft 107b spiral blades 108Y, 110Y drive gear 112Y gear 114Y first component member 116Y first component member 116Y Second component 12 Y shutter 126Y bearings 128a, 128b, 128c, 128d screw holes 130 boss 132 boss hole

Claims (5)

A cylindrical member through which the powder can pass;
A conveying member that is provided in the cylindrical member so as to extend in substantially the same direction as the cylindrical member, and conveys powder in a direction in which the cylindrical member extends by rotating;
A driving force transmitting member that is provided at an end of the conveying member and transmits a driving force so that the conveying member rotates;
A unit body to which a part of the cylindrical member is fixed;
The cylindrical member is connected to the first component member fixed to the unit main body and to the downstream side in the powder conveying direction with respect to the first component member, and is connected to the first component member and the unit main body. A second component that is supported and supported by play;
The conveyance member includes a rotation shaft driven by the drive transmission member and a spiral blade provided around the rotation shaft, does not contact the inner surface of the cylindrical member, and the drive force transmission member In order to satisfy a predetermined meshing condition, the first component member is rotatably supported by a bearing on the end portion side where the drive transmission member is provided, and play is provided to the second component member. Supported powder conveying device. An image carrier for holding a toner image;
An image forming apparatus main body that accommodates the image carrier;
Peeling means for peeling off the toner remaining on the image carrier;
A toner cartridge which is detachably attached to the image forming apparatus main body and receives the toner peeled off by the peeling means;
A toner conveying device that conveys the toner separated by the peeling means to the toner cartridge;
The toner conveying device includes:
A cylindrical member through which toner can pass;
A conveying member that is provided in the cylindrical member so as to extend in substantially the same direction as the cylindrical member, and conveys toner in a direction in which the cylindrical member extends by rotating;
A driving force transmitting member that is provided at an end of the conveying member and transmits a driving force so that the conveying member rotates;
A unit body to which a part of the cylindrical member is fixed;
The cylindrical member is connected to the first component member fixed to the unit main body and to the downstream side in the powder conveying direction with respect to the first component member, and is connected to the first component member and the unit main body. A second component that is supported and supported by play;
The conveying member is rotatably supported by the first component member so as not to contact the inner surface of the cylindrical member and the driving force transmission member satisfies a predetermined meshing condition, and the second configuration An image forming apparatus provided with play and supported by a member . Drive means for driving the image carrier to rotate;
The driving force transmission member is
The image forming apparatus according to claim 2, wherein a driving force of the driving unit is transmitted. The conveying member is
A rotating shaft driven by the driving force transmitting member;
4. The image forming apparatus according to claim 2, further comprising a spiral blade provided around the rotation shaft. The conveying member is
The image forming apparatus according to claim 2, wherein the image forming apparatus is supported by a bearing on an end portion side where the driving force transmission member is provided.

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