JP2005284179A - Drive transmitting means and image forming apparatus equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable contact/separation of gears without causing the damage of the gears or the like in a plurality of motive power transmitting mechanisms made to intervene between an image forming apparatus body and a developer storage part. <P>SOLUTION: A plurality of developer containers 110, 120, 130 and 140 are mounted on a container base 101 capable of sliding with respect to an apparatus body, and a plurality of motive power transmitting mechanisms 119, 129, 139 and 149 are provided between the apparatus body and the plurality of developer containers 110, 120, 130 and 140. In order to prevent a gear on an upstream side (for example, a gear 210) from abutting on a rocking gear on a downstream side (for example, a rocking gear 223) when the developer containing part 100 is made to slide, a flange 217 on an upstream side abuts on a butting roller 228 on a downstream side so as to retract the rocking gear 223. The diameter of the flange on the more downstream side is made smaller, and the diameter of the butting roller on the more downstream side is made larger. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drive transmission unit and an image forming apparatus including the drive transmission unit.

  In an image forming apparatus such as a color copying machine or a printer, a plurality of containers for storing a developer are provided. Many of the most common color image forming apparatuses include developers of four colors of yellow, magenta, cyan, and black.

  In a small color printer, the amount of developer consumption is not so large. In a monochrome image forming apparatus, only one color developer needs to be replenished. For this reason, in order to reduce the size of the image forming apparatus main body (hereinafter simply referred to as “apparatus main body”), many developer containers are built in the apparatus main body. Patent Document 1 discloses an image forming apparatus including a plurality of developer replenishing units arranged at positions away from the developing device and a developer replenishing unit that replenishes the developer from the position to the developing unit. ing. In Patent Document 1, the developer container is disposed in the apparatus main body and is configured to be detachable in the front direction of the apparatus main body.

  On the other hand, an image forming apparatus capable of large-scale, high-speed, and large-volume printing consumes a large amount of developer and needs to store a large amount of developer in the apparatus main body. In view of this, there are some which are provided with a developer container outside the apparatus main body, which is advantageous in terms of space, and in order to replenish the developer efficiently. In the image forming apparatus in which the developer container is installed outside the apparatus main body as described above, it is preferable that the developer container is disposed on the upper part of the apparatus main body. This is because the developer is usually placed inside the main assembly, but if the developer container is placed directly above the developer, the developer can be supplied to the developer by its own weight drop, so no drive means is required. This is because the efficiency is high.

  If the developer container cannot be placed directly above the developer unit, a developer transport path for transporting the developer to the developer unit is required. In this case as well, the developer container is directly above the developer transport path. If arranged, the developer can be supplied efficiently by dropping its own weight. Further, with respect to the replenishment / replacement of the developer, it is preferable to dispose the developer container in the upper part of the apparatus main body, so that the user can replace it in front of the eyes easily in a standing posture.

  The printers capable of large-scale, high-speed, and large-volume printing as described above have a long durability number and long time, so that there are many cases where maintenance of the main body of the apparatus, particularly cleaning of each part and periodic replacement of parts are required. When the large-capacity developer container as described above is arranged at the upper part of the apparatus main body, when maintenance of the apparatus main body is performed, the accessibility from the upper part of the apparatus main body to the respective parts becomes very poor. For this reason, Patent Document 2 discloses a device in which a developer container is supported by a slide rail or the like, and maintenance is performed by retracting the developer container from the upper part of the apparatus main body by a slide rail during maintenance. Since the slide rail is usually installed almost horizontally, the developer containing device also moves almost horizontally.

  In order to transport the developer to the developer container and the developer transport path, a transport member such as a screw is usually used. These screws are driven from a motor or the like through a gear train or the like. The developer container and the screw in the developer conveyance path need to be driven synchronously. For this reason, the simplest method is to input the drive from the motor to one screw and drive the other screw by using a gear or the like at the shaft end of each screw to engage with each other.

JP-A-11-249405 Japanese Patent Laid-Open No. 2000-242072

  Although the above-described color image forming apparatus includes a plurality of developer containers, it is preferable to move the plurality of developer containers integrally when performing maintenance from the viewpoint of maintainability. In addition, the developer container and each component (conveying screw and stirring member) assembled to the developer container are all the same from the viewpoint of mass productivity, and the cost of the product is reduced. In this case, since the developer containers and the like are all the same shape and size, when the developer containers are arranged in parallel in the upper direction of the apparatus main body, the developer is discharged from the developer container downward. The outlets are arranged on the same line in the sliding direction of the developer container.

  At this time, when the developer container is slid for maintenance or the like, the gear disposed on the developer conveying screw of the developer container located on the upstream side of the slide starts to move on the developer conveying path located on the downstream side in the sliding direction. There is a risk of contact with the gear disposed on the screw, which may cause damage to the gear.

  The present invention provides a drive transmission means capable of preventing the first gear on the upstream side from coming into contact with the second gear on the downstream side when the movable body is moved relative to the apparatus main body, It is another object of the present invention to provide an image forming apparatus including the same.

  The present invention relates to a drive transmission means having a plurality of power transmission mechanisms interposed between an apparatus main body and a movable body movably supported by the apparatus main body, wherein the power transmission mechanism is arranged on the movable body side. A first gear provided; and a second gear disposed on the apparatus main body side and meshed with the first gear when the movable body is disposed at a home position. A pair of gears constituted by one gear and the second gear are arranged in alignment along the moving direction of the moving body, and when the moving body is moved, the first gear on the upstream side It has an approach / separation mechanism for preventing contact with the second gear on the downstream side.

  According to the present invention, when the moving body is moved, the separation mechanism can prevent the upstream first gear from coming into contact with the downstream downstream second gear. Can be prevented from being damaged. In addition, the maintainability of the apparatus main body can be improved by moving the moving body relative to the apparatus main body. Further, it is possible to promote the common use of the constituent members of the moving body and the power transmission mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, what attached | subjected the same code | symbol in each drawing has the same structure or the same effect | action, The duplication description about these was abbreviate | omitted suitably.

<Embodiment 1>
FIG. 1 is a longitudinal sectional view of an image forming apparatus (color printer) to which the present invention can be applied, as viewed from the front side (front side: the side on which the user stands during operation). In the following description, the right side in the figure is referred to as “the right side of the image forming apparatus body (apparatus body) A”, and the left side in the figure is referred to as “the left side of the image forming apparatus body (apparatus body) A”.

  Image information sent from a personal computer or the like is converted into an electrical signal by an image processing unit (not shown) and transmitted to a laser scanner. In the color printer of this embodiment, four laser scanners are installed. From the left side of the figure, a yellow (Y) laser scanner 51, a magenta (M) laser scanner 52, and a cyan (C) laser scanner. The laser scanner 53 and the black (K) laser scanner 54 are provided. Since the operation of the image writing system is the same for all of yellow, magenta, cyan, and black, the operation will be described by taking the case of yellow as an example.

  The laser scanner 51 generates laser light corresponding to image information. This laser beam is scanned by an image signal writing optical system (not shown), folded back by the folding mirror 55 toward the yellow (Y) photosensitive drum 60, and formed on the uniformly charged photosensitive drum 60. An electrostatic latent image is formed. This electrostatic latent image is developed as a toner image by the developing device 61.

  The toner image on the photosensitive drum 60 developed by the developing device 61 is transferred (primary transfer) to the intermediate transfer belt 40 by the primary transfer roller 62. The intermediate transfer belt 40 is stretched around three rollers, a tension roller 42, a driving roller 41, and a secondary transfer counter roller 43, and rotates in the direction of arrow R40 in the figure. Similarly, the toner images on the photosensitive drums developed by the magenta, cyan, and black developing devices are sequentially transferred onto the intermediate transfer belt 40. In this way, the four color toner images are superimposed on the intermediate transfer belt 40.

  Next, the recording material S (for example, paper, transparent film) is set in the paper feed cassette 1 and stored in the apparatus main body A. When the paper feed cassette 1 is set in the apparatus main body A, the lifter 4 in the paper feed cassette 1 is lifted by a lifter motor (not shown), and the paper surface of the recording material S is raised accordingly, and the paper can be fed. Become. The recording material S starts to move by the rotation of the paper feed roller 2, separated one by one by the separation roller pair 3, and conveyed to the registration roller 30 through the conveyance roller row 5. The recording material S whose skew has been corrected by the registration roller 30 is conveyed to the secondary transfer portion.

  The above-described four color toner images superimposed on the intermediate transfer belt 40 are collectively transferred (secondary transfer) onto the recording material S by the secondary transfer counter roller 43 and the secondary transfer roller 44. The recording material S to which the toner image has been transferred is peeled off from the intermediate transfer belt 40 by a separation charger (not shown). Then, the toner image is fixed on the surface of the recording material S by the fixing device 8 via the conveyance unit 7. The recording material S after the toner image is fixed is discharged onto a discharge tray 10 outside the apparatus main body A by a discharge roller array 9. As a result, a four-color full-color toner image is formed on one side of one recording material S, and the printing (image forming) operation is completed.

  Next, the developer container 100 will be described in detail.

  FIG. 2 is a front view of the developer container 100 according to the present invention, and FIG. 3 is a perspective view of the developer container 100. 4 and 5 show only the yellow developer container 110. FIG. The developer discharge port 113 and the developer transport pipe 152 are partially broken so that the internal structure can be seen.

  As shown in FIG. 1, the developer accommodating portion 100 is disposed on the upper portion (upper surface) of the apparatus main body A. In the drawing, reference numeral 110 denotes a yellow developer container, 120 denotes a magenta developer container, 130 denotes a cyan developer container, and 140 denotes a black developer container. The developer accommodating portion 100 is integrally configured by placing each developer accommodating device 110, 120, 130, 140 on a container table (moving base) 101. As shown in FIG. 2, slide rails 102 are laid in the left-right direction on the upper portion of the front side surface and the upper portion of the rear side surface (not shown) of the apparatus main body A. On the other hand, the developer container 100 has a guide member 103 that is integral with the container table 101. This guide member 103 has a longitudinal section in the front-rear direction (vertical section in a direction perpendicular to the sliding direction) formed in a U-shape and is formed long in the left-right direction. The developer accommodating portion 100 can slide in the left-right direction as a whole by engaging the guide member 103 with the guide rail 102 described above. FIG. 3 illustrates a state in which it is arranged at the home position (leftward movement limit). Therefore, with reference to the same drawing, the entire developer accommodating portion 100 slides to the right. Further, the limit of movement to the right of the developer accommodating portion 100 is regulated by a stopper (not shown).

  Next, the inside of each developer container 110, 120, 130, 140 will be described. As shown in FIGS. 4 and 5, the developer container 110 has an agitating member 111 for agitating the developer and the developer facing the front side of the apparatus main body A (in the direction of arrow K111 in FIG. 4). A developer conveying screw 112 for conveying is provided. Each developer container 110, 120, 130, 140 and each component disposed therein, that is, the above-described stirring member 111 and developer conveying screw 112 are all common components for each color so as to be suitable for mass production. It is made up of.

  The developer in the developer container 110 is appropriately stirred by the stirring member 111 and transported toward the front side of the apparatus main body A by the developer transport screw 112. A developer discharge port 113 is provided at the front end of the developer container 110. The developer conveyed to the front side by the developer conveying screw 112 falls downward from the developer discharge port 113.

  A developer conveyance path 150 for conveying the developer to the developing device 154 is formed below the developer discharge port 113. The developer transport path 150 has a developer receiving port 151 in the upper part (near the right end in FIGS. 4 and 5), a developer transport pipe 152 extending obliquely downward from the developer receiving port 151, and this developer transport path. A developer conveying screw 153 is provided in the pipe 152 and conveys the developer. A developer supply port 155 is provided at the lower end of the developer transport pipe 152.

  As shown in FIG. 9, drive motors (drive sources) 200 and 201 for driving the stirring member 111 and the developer transport screw 112 are disposed on the rear side of the developer container 110. The driving force of the driving motor 200 is transmitted to the driving pulley 202, the belt 204, and the driven pulley 206, and rotates the developer conveying screw 112. Further, the driving force of the driving motor 201 is transmitted to the driving pulley 203, the belt 205, and the driven pulley 207 to drive one stirring member 111. Further, gear 209 integrated with one stirring member 111, idler gears 208 and 208, and gear 209 integrated with the other stirring member 111 are transmitted to rotate the other stirring member 111.

  FIG. 8 shows the power transmission mechanisms 119, 129, 139, and 149 of the developer containers 110, 120, 130, and 140 disposed on the front side of the developer container 100. Since these drive transmission mechanisms 119, 129, 139, and 149 are configured in substantially the same manner, the power transmission mechanism 119 of the developer container 110 will be described as an example.

  FIG. 11 shows an enlarged perspective view of the power transmission mechanism 119 of the developer container 110. As shown in the figure, the developer conveying screw 112 disposed in the developer container 110 has a front end projecting through the developer discharge port 113. A flange (first roller) 217 and a gear (first gear) 210 are fixed to the protruding portion. The gear 210 as the first gear and the swinging gear 213 as the second gear described later constitute a separating means 261.

  A bevel gear (bevel gear) 211 is fixed to the upper end portion of the developer conveying screw 153 (see FIG. 4) disposed inside the developer conveying pipe 152 of the developer conveying path 150 as shown in FIG. ing. Another bevel gear 212 that meshes with the bevel gear 211 is disposed such that its axis (rotation center) faces in the front-rear direction. The bevel gear 212 is rotatably supported by a support plate 250 integral with the apparatus main body A. A gear 251 is integrally fixed to the bevel gear 212 on the front side of the support plate 250. The gear 251 meshes with a swing center gear 214 that is rotatably supported by a support plate 250.

  A rocking gear 213 is meshed with the rocking center gear 214. The swing gear 213 is rotatably supported by a swing plate 215 that is swingably supported by a rotation shaft 214 a of the swing center gear 214. The swing plate 215 restricts the distance between the swing center gear 214 and the swing gear 213. A tip end of a tension spring (tension spring) 216 as a contact means whose base end side is attached to the support plate 250 is connected to the corner portion 215 a of the swing plate 215. As a result, the swinging plate 215 is urged in the direction of arrow D about the rotation shaft 214a. When the developer accommodating portion 100 is disposed at the home position, the swing gear 213 is meshed with the gear 210 that is fixed to the protruding portion of the developer conveying screw 112 described above.

  An abutting roller (second roller) 218 is arranged coaxially with the swing gear 213 behind the swing gear 213. The abutment roller 218 abuts on the flange 217 by the oscillating plate 215 being urged in the direction of arrow D by the tension spring 216 described above. Thereby, the distance between the shafts of the gear 210 and the swing gear 213 is regulated.

  With the configuration described above, when the developer conveying screw 112 of the developer container 110 is rotated by the drive motor 200, the rotation of the developer conveying screw 112 is caused by the gear 210, the swing gear 213, and the swing center gear 214. , The gear 251, the bevel gear 212, and the bevel gear 211 are transmitted to the developer transport screw 153 in the developer transport pipe 152.

  In the configuration as in the present embodiment, the maintenance and the like of the laser scanners 51 to 54 are most efficient when work is performed from the upper surface side of the apparatus main body A. In this case, it is necessary to open the upper surface of the apparatus main body A. However, in this configuration, since the developer accommodating portion 100 is on the upper surface of the apparatus main body A, it is necessary to retract the developer accommodating portion 100. In the present embodiment, the developer accommodating portion 100 is slidable (movable) in the right direction in FIGS. 1 to 3 along the slide rail 102 with the components arranged above the developer discharge port 113 being integrated. ). Since the developer transport pipe 152 and the developer 154 disposed below the developer receiving port 151 are fixed on the apparatus main body A side, the developer discharge port 113 of the developer container 110 and the developer transport pipe Separation is performed at a contact surface (separation surface) 115 where the developer receiving port 151 of 152 contacts each other. Therefore, a shutter 114 is provided at the lower end of the developer discharge port 113 so that the developer in the developer container 110 does not fall. The contact surface 115 described above is configured to be slightly inclined with respect to the horizontal plane as will be described later. When it is necessary to distinguish the contact surface 115 from the contact surface on the developer discharge port 113 side and the contact surface on the developer receiving port 151 side, the former is referred to as a contact surface a and the latter is referred to as a contact surface b.

  Normally, as shown in FIG. 3, in a state where image formation is performed, the shutter 114 is opened, and the developer can be discharged downward. When the developer accommodating portion 100 is slid, the developer discharge port 113 is covered with the sliding operation. For this reason, the developer in the developer container 110 does not fall downward even during sliding. As a configuration for realizing this, for example, the shutter 114 is urged to the closed position shown in FIGS. 6 and 7 by an urging member (a tension spring). On the other hand, when the developer container 100 is disposed at the home position on the apparatus main body A side, the developer container 100 abuts against the shutter 114 of each developer container 110, 120, 130, 140 from the closed position, as shown in FIGS. A protrusion (not shown) that is moved to the open position shown in FIG. Thus, the shutter 114 is disposed in the open position when the developer accommodating portion 100 is disposed at the home position, and is closed by the biasing member when the developer accommodating portion 100 is slid rightward from the home position. Placed in position.

  Similarly, in the drive transmission means, the drive train downstream of the swing gear 213 along the power transmission direction is fixed to the apparatus main body A side, and the developer conveying screw 112 and the like upstream of the gear 210 are Then, it integrally slides along the slide rail 102 together with the developer container 100.

  Next, the drive transmission means for the developer conveyance path will be described in detail.

  As described above, the developer conveying screw 153 of the developer conveying path 150 is driven via the developer conveying screw 112 of the developer containers 110, 120, 130, and 140. The developer containers are yellow 110, magenta 120, cyan 130, and black 140 from the left, and these developer containers 110, 120, 130, and 140 are from the upstream side (left side) in the sliding direction with respect to the container table 101. A yellow developer container 110, a magenta developer container 120, a cyan developer container 130, and a black developer container 140 are mounted in that order. These four developer containers 110, 120, 130, and 140 are arranged in the longitudinal direction, that is, in parallel with each other. Furthermore, they are arranged side by side at the same height on the same plane. This is because the developer containers 110, 120, 130, and 140 are parts having the same shape, and the space of the apparatus main body A is reduced both in the front-rear direction and in the lower direction. Further, the developer transport screw 112, the gear 210, the swing gear 213, the swing center gear 214, the support plate 250, the gear 251, the bevel gear 212, the bevel gear 211, and the developer transport screw 153 of the developer transport path 150 are the same for each color. The parts are used.

  The magenta, cyan, and black drive transmission means other than the above-described yellow include gears 220, 230, and 240 similar to the gear 210 and the swing gear 213 of the yellow developer transmission means, and the swing gears 223, 233, respectively. 243 is arranged. These gears 210, 220, 230, 240 and swing gears 213, 223, 233, and 243 are all along the sliding direction of the developer accommodating portion 100 so that the positions in the front-rear direction and the vertical direction are the same. It is arranged. That is, the gears 210, 220, 230, and 240 are arranged at the same height on the same plane in each color, and the swing gears 213, 223, 233, and 243 that mesh with the gears are also almost the same height on the same plane. Will be lined up.

  When the developer container 100 is slid with respect to the apparatus main body A in this state, the gear 210 located on the most upstream side in the sliding direction slides while colliding with the swinging gears 223, 233, and 243 located downstream in the sliding direction. Will do. Similarly, the gear 220 slides while colliding with the swinging gears 233 and 243 located downstream in the sliding direction, and the gear 230 slides while colliding with the swinging gear 243.

  In the present invention, in order to avoid such a collision between gears, a member that regulates an inter-axis distance between each of the gears 210, 220, 230, and 240 and each of the swinging gears 213, 223, 233, and 243, that is, For the flanges 217, 227, 237, and 247 on the developer accommodating portion 100 side and the abutting rollers 218, 228, 238, and 248 on the apparatus main body A side, a method of changing the outer diameters in the sliding direction was adopted.

  Specifically, the gears 210, 220, 230, and 240 are all the same gear, and the swinging gears 213, 223, 233, and 243 are all the same gear, and its module is 1. The radius of the flange 227 on the downstream side in the sliding direction is made 2.5 mm smaller than the radius of the yellow flange 217 with respect to the radius of the yellow flange 217 that regulates the inter-shaft distance of each gear. Hereinafter, the radius of the cyan flange 237 is 2.5 mm smaller than the radius of the magenta flange 227, and the radius of the black flange 247 is 2.5 mm smaller than the radius of the cyan flange 237.

  On the other hand, since the gears 210, 220, 230, and 240 and the swinging gears 213, 223, 233, and 243 are all the same, the distance between the axes is naturally the same. Therefore, the abutting rollers 218, 228, 238, and 248 that abut against the flanges 217, 227, 237, and 247 have the smallest radius of the yellow abutting roller 218, and the magenta abutting roller 228 has a radius of the yellow abutting. The radius of the contact roller 218 was 2.5 mm larger. Hereinafter, the radius of the cyan abutting roller 238 is 2.5 mm larger than the radius of the magenta abutting roller 228, and the radius of the black abutting roller 248 is 2.5 mm larger than the radius of the cyan abutting roller 238. .

  When the developer accommodating portion 100 is slid in such a configuration, the yellow flange 217 first abuts against the magenta abutting roller 228 before the gear 210 and the downstream swing gear 223 collide with each other. And the oscillating gear 223 are eliminated. Similarly, before the magenta, cyan, and black gears 220, 230, and 240 collide with the swinging gears 233 and 243 that are positioned downstream in the sliding direction, the flanges 227, 237, and 247 are brought into contact with the rollers 228, 238, and 248. Since it hits first, there is no collision between gears.

  FIG. 10 is a diagram of the yellow developer container 110 in contact with the black drive transmission means. From this figure, it can be seen that the gear 210 is not in contact with the swinging gear 243 because the flange 217 abuts against the abutting roller 248.

  In the present embodiment, the difference in radius between the flanges 217, 227, 237, and 247 and the difference in radius between the abutment rollers 218, 228, 238, and 248 are set to 2.5 mm each. Other values can be set on condition that the tip does not collide. As a calculation method of these radius differences, when the modules of the gears 210, 220, 230, and 240 and the swinging gears 213, 223, 233, and 243 are set to M, the radius difference may be 2M or more (diameter difference is 4M or more). . In addition, what is necessary is just to add the amount of displacement, when these gears are transposing.

<Embodiment 2>
In the first embodiment described above, the drive motors 200 and 201 are disposed on the developer accommodating portion 100 side, and the developer conveying screw 112 in the developer accommodating containers 110, 120, 130, and 140 is provided by these drive motors 200 and 201. The example in which the developer transport screw 153 of the developer transport path 150 of each color is rotated by the developer transport screw 112 has been described.

  In the second embodiment, on the contrary, a drive motor is disposed on the apparatus main body A side, that is, on the developer conveying screw 153 side of the developer conveying path 150, and the developer accommodating portion 100 is provided by the developer conveying screw 153. That is, the developer conveying screw 112 in the developer container 110, 120, 130, 140 is driven. In this way, the drive motor as the drive source is arranged on the apparatus main body A side, and the developer accommodating portion 100 side that slides is set as the driven side, so that the bundle wire connected to the drive motor at the time of the slide operation can be obtained. Since the separation becomes unnecessary, it is possible to further improve the maintainability.

1 is a front longitudinal sectional view showing a schematic configuration of an image forming apparatus according to the present invention. FIG. 3 is a front view illustrating a configuration of a developer accommodating portion and a developer conveyance path according to the first embodiment. FIG. 3 is a perspective view illustrating a configuration of a developer accommodating portion and a developer conveyance path according to the first embodiment. FIG. 3 is a perspective view illustrating a configuration of a developer container for yellow and a developer conveyance path according to the first embodiment. FIG. 3 is a front view illustrating a configuration of a yellow developer container and a developer conveyance path according to the first embodiment. FIG. 6 is a perspective view showing a state in which the developer accommodating portion starts a sliding operation and the shutter is disposed at a closed position in the first embodiment. FIG. 6 is a front view showing a state in which the developer accommodating portion starts a sliding operation and the shutter is disposed at a closed position in the first embodiment. 3 is a perspective view illustrating a configuration of a power transmission mechanism disposed on the front side of each developer container of the developer container in Embodiment 1. FIG. FIG. 3 is a perspective view showing a drive system disposed on the rear surface side of the developer container in the first embodiment. It is a perspective view which shows a gear and a rocking | fluctuation gear seemingly spaced apart by abutting roller contact | abutting to a flange. It is an expansion perspective view which shows the detail of a structure of a power transmission mechanism.

Explanation of symbols

100 Developer container (moving body)
110 Yellow developer container 119, 129, 139, 149
Power transmission mechanism 120 Magenta developer container 130 Cyan developer container 140 Black developer container 200 Drive motor (drive source)
210, 220, 230, 240
Gear (first gear)
213, 223, 233, 243
Swing gear (second gear)
216 Tension spring (contact means)
217, 227, 237, 247
Flange (first roller)
218, 228, 238, 248
Butting roller (second roller)
260 Contact / separation mechanism 261 Separation means A Image forming apparatus main body (apparatus main body)
S Recording material

Claims (8)

In a drive transmission means having a plurality of power transmission mechanisms interposed between an apparatus main body and a movable body movably supported by the apparatus main body,
The power transmission mechanism meshes with the first gear disposed on the movable body side and the first gear when disposed on the apparatus main body side and the movable body is disposed at the home position. A second gear,
A gear pair constituted by the first gear and the second gear is arranged in alignment along the moving direction of the moving body,
Having an approach / separation mechanism for preventing the first gear on the upstream side from coming into contact with the second gear on the downstream side when the movable body is moved;
The drive transmission means characterized by the above. The contact / separation mechanism includes an abutment unit that urges and meshes the second gear with respect to the first gear at the home position on the moving body, and the upstream first side by the movement of the moving body. Separating means for preventing contact with the first gear by retracting the second gear against the urging force of the abutting means when the second gear is in the vicinity of the second gear on the downstream side; Having
The drive transmission means according to claim 1. The separating means is arranged to be coaxial with the first gear and the second gear and coaxially with the second gear, and is brought into contact with the first roller by the abutting means. A second roller that regulates an inter-axis distance between the first gear and the second gear;
The drive transmission means according to claim 2. The diameter of the first roller is smaller as the first roller is disposed on the downstream side of the moving body along the moving direction.
The second roller has a larger diameter as disposed on the downstream side along the moving direction of the moving body,
The drive transmission means according to claim 3. When the module of the first gear and the second gear is M,
The diameter difference between the first rollers adjacent to each other and the diameter difference between the second rollers adjacent to each other is 4M or more.
The drive transmission means according to claim 4. A drive source of power transmitted through the power transmission mechanism is disposed on the movable body side,
The drive transmission means according to any one of claims 1 to 5. A drive source of power transmitted through the power transmission mechanism is disposed on the apparatus main body side,
The drive transmission means according to any one of claims 1 to 5. In an image forming apparatus for forming an image on a recording material with a developer,
An image forming apparatus main body having an image forming unit for forming an image;
A developer container supported movably by the image forming apparatus main body,
The drive transmission means according to any one of claims 1 to 7 is provided between the image forming apparatus main body and the developer accommodating portion.
An image forming apparatus.

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