Patent Publication Number: US-11022927-B1

Title: Image formation device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Applications No. 2020-049953 and No. 2020-049954 which were filed on Mar. 19, 2020. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to an image formation device. 
     2. Related Art 
     JP-A-2010-282124 discloses a technology related to an image formation device. In this related-art technology, the image formation device includes: a fixed frame provided with a transfer roll; a plurality of fixed side supporting rolls provided on the fixed frame; a movable frame swingably attached to the fixed frame and provided with a plurality of transfer rolls; a movable side supporting roll provided on the movable frame; and an endless belt configured to be in contact with a transfer roll provided on a frame, which is stretched and fixed to the fixed side supporting roll and the movable side supporting roll, and the transfer roll supported by the movable frame and to be in contact with a plurality of photosensitive drums. A swing center of the movable frame is at a center of a belt portion on both sides of the swing center, and in a monochrome mode, the movable frame swings to separate the belt from the photosensitive drums other than the monochrome mode. 
     SUMMARY 
     When a power supply path from a power source unit to a unit involved in image formation as a power supply target is provided in a device housing, a space for providing the power supply path in the device housing is required. 
     Aspects of non-limiting embodiments of the present disclosure related to an image formation device that is capable of reducing a device width of an image formation device as compared with a case where a power supply path is provided in a device housing. 
     Aspects of certain non-limiting embodiments of the present disclosure address the above advantages and/or other advantages not described above. However, aspects of the non-limiting embodiments are not required to address the advantages described above, and aspects of the non-limiting embodiments of the present disclosure may not address advantages described above. 
     According to an aspect of the present disclosure, there is provided an image formation device comprising a first unit for image formation, attachably and detachably disposed in the image formation device, a power source unit configured to supply electric power to the first unit, a second unit for image formation, attachably and detachably, independently of the first unit, disposed in the image formation device, and disposed between the first unit and the power source unit, and a power supply path provided in the second unit, and configured to be supplied with the electric power from the power source unit and supply the electric power to the first unit. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Exemplary embodiments of the present invention will be described in detail based on the following figures, wherein: 
         FIG. 1  is an overall configuration diagram of an image formation device according to an exemplary embodiment of the present invention; 
         FIG. 2  is a perspective view showing the entire image formation device according to the exemplary embodiment of the present invention in a state in which first and second opening and closing doors are disposed at closed positions; 
         FIG. 3  is a perspective view showing the entire image formation device according to the exemplary embodiment of the present invention in a state in which the first opening and closing door is disposed at an opened position and a first unit is detached; 
         FIG. 4  is a perspective view of the entire image formation device according to the exemplary embodiment of the present invention in a state in which both the first and second opening and closing doors are disposed at opened positions and the first unit is detached; 
         FIG. 5  is a perspective view showing the entire image formation device according to the exemplary embodiment of the present invention in a state in which both the first and second opening and closing doors are disposed at the opened positions and both first and second units are detached; 
         FIG. 6  is an enlarged side view of a power supply structure portion serving as a main part of the image formation device according to the exemplary embodiment of the present invention as viewed from a device width direction; 
         FIG. 7  is an enlarged front view of the power supply structure portion serving as the main part of the image formation device according to the exemplary embodiment of the present invention as viewed from a device depth direction; 
         FIG. 8  is a perspective view of the second unit, a power source side development contact portion and a power source side charging contact portion; 
         FIG. 9  is an enlarged perspective view of a power supply structure portion serving as a main part of the second unit; and 
         FIG. 10  is an enlarged side view of the power supply structure portion serving as the main part of the second unit as viewed from the device width direction. 
     
    
    
     DETAILED DESCRIPTION 
     An example of an image formation device according to an exemplary embodiment of the present invention will be described. 
     &lt;Overall Configuration&gt; 
     First, an overall configuration of the image formation device will be described. As shown in the drawings, an arrow H indicates a device upper-lower direction (a vertical direction), an arrow W indicates a device width direction (a horizontal direction), and an arrow D indicates a device depth direction (a horizontal direction). 
     The device width direction in the present exemplary embodiment is a rotation axis direction of an intermediate transfer belt  66  as an example of an intermediate transfer member described below. A device width in the present exemplary embodiment is the entire length of an image formation device  10  in the device width direction. 
     A stacking direction of a first unit  100 , a second unit  200  and a power source unit  300  described below in the present exemplary embodiment is the device upper-lower direction. 
     [Image Formation Device] 
     As shown in  FIG. 1 , the image formation device  10  according to the present exemplary embodiment includes: an accommodation portion  26  in which a sheet member P as a recording medium is accommodated from a lower side to an upper side in the upper-lower direction (a direction of the arrow H); a conveyance unit  16  that conveys the sheet member P such as recording paper as the example of the recording medium accommodated in the accommodation portion  26 ; an image formation member  20  that forms an image on the sheet member P conveyed from the accommodation portion  26  by the conveyance unit  16 ; the power source unit  300 , and an image reading unit  90  that reads the image written on a document. 
     The image formation device  10  further includes a device housing  10 A that accommodates therein the conveyance unit  16 , the accommodation portion  26 , the image formation member  20 , the power source unit  300  and the like. 
     (Accommodation Portion) 
     The accommodation portion  26  may be pulled out frontward from the device housing  10 A of the image formation device  10  in the device depth direction, and the sheet member P is stacked in the accommodation portion  26 . The accommodation portion  26  is provided with a delivery roll  30  that delivers the uppermost sheet member P stacked in the accommodation portion  26  to a conveyance path  28  constituting the conveyance unit  16 . 
     (Conveyance Unit) 
     The conveyance unit  16  is provided with a plurality of conveyance rolls  32  that convey the sheet member P along the predetermined conveyance path  28 . 
     (Image Formation Member) 
     The image formation member  20  is provided with the first unit  100  having image formation units  18 Y,  18 M,  18 C,  18 K of four colors yellow (Y), magenta (M), cyan (C) and black (K). The image formation member  20  further includes exposure devices  22 Y,  22 M,  22 C,  22 K of each color that irradiate image carriers  36 Y,  36 M,  36 C,  36 K provided in the image formation units  18 Y,  18 M,  18 C,  18 K of each color with exposure light. In the following description, Y, M, C, K may be omitted when Y, M, C, K need not be distinguished from each other. 
     The image formation member  20  includes the second unit  200  provided with the endless intermediate transfer belt  66  that circulates in a direction of an arrow A in the drawing, and a primary transfer roll  68  that transfers a toner image formed by the image formation unit  18  of each color onto the intermediate transfer belt  66 . 
     The image formation member  20  includes a secondary transfer roll  60  that transfers the toner image of the intermediate transfer belt  66  onto the sheet member P, and a fixing device  62  that heats and pressurizes the sheet member P to fix the toner image on the sheet member P. 
     (Exposure Device) 
     The exposure device  22  is provided for each color, and is disposed below the image carrier  36  of each color so as to face the image carrier  36  of each color in the device upper-lower direction. The exposure device  22  of each color is attached to the device housing  10 A of the image formation device  10 . The exposure device  22  irradiates a surface of the charged image carrier  36  with the exposure light to form an electrostatic latent image on the surface of the image carrier  36 . 
     (First Unit) 
     The first unit  100  includes the image formation units  18  of four colors and a first unit housing  102  that integrally accommodates the image formation units  18  of four colors. A removable toner box, a waste toner box and the like (not shown) are connected to outside of the first unit  100  in the device width direction. Details of the first unit  100  will be described in [configuration of main parts] below. 
     (Image Formation Unit) 
     The image formation unit  18  of each color provided in the first unit  100  includes the image carrier  36  whose rotation axis direction is the device width direction, a charging roll  24  that charges the surface of the image carrier  36 , and a development device  33  having a development roll  25  that develops the electrostatic latent image formed by irradiating the surface of the charged image carrier  36  with the exposure light to visualize the electrostatic latent image as the toner image. The color image formation units  18 Y,  18 M,  18 C,  18 K of four colors are arranged in this order from a front side to a back side in the device depth direction. 
     In the present exemplary embodiment, the “front side in the device depth direction” is a side facing a user who uses the image formation device  10 . In the present exemplary embodiment, the rotation axis direction of the image carrier  36  is the device width direction. 
     (Second Unit) 
     The second unit  200  includes the intermediate transfer belt  66 , the primary transfer roll  68 , a pair of tension rolls  70  around which the intermediate transfer belt  66  is wound and whose rotation axis direction is the device width direction, and roll support members  204 A,  204 B (see  FIG. 6  and the like) that integrally support the parts. 
     The pair of tension rolls  70  are spaced apart from each other in the device depth direction. The intermediate transfer belt  66  is wound around the pair of tension rolls  70 , and the image carrier  36  of each color is in contact with the intermediate transfer belt  66  from below the intermediate transfer belt  66 . A plurality of primary transfer rolls  68  are provided for each color, and are disposed on a side opposite to the image carrier  36  with the intermediate transfer belt  66  interposed therebetween. 
     When a rotation driving force is transmitted to one of the tension rolls  70  to rotate one tension roll  70 , the intermediate transfer belt  66  circulates in the direction of the arrow A. The primary transfer roll  68  transfers the toner image formed on the image carrier  36  onto the circulating intermediate transfer belt  66 . Details of the second unit  200  will be described in [configuration of main parts] below. 
     As described above, the device width direction in the present exemplary embodiment is the rotation axis direction of the intermediate transfer belt  66  as the example of the intermediate transfer member. 
     (Secondary Transfer Roll) 
     The secondary transfer roll  60  is disposed on a side opposite to the tension roll  70  on the back side in the device depth direction with the intermediate transfer belt  66  interposed therebetween. The conveyance path  28  of the sheet member P passes between the intermediate transfer belt  66  and the secondary transfer roll  60 . The secondary transfer roll  60  transfers the toner image transferred onto the circulating intermediate transfer belt  66  onto the sheet member P conveyed by the conveyance rolls  32   
     (Power Source Unit) 
     The power source unit  300  shown in  FIG. 1  supplies power to charging rolls  24 Y,  24 M,  24 C,  24 K and development rolls  25 Y,  25 M,  25 C,  25 K provided in the image formation units  18 Y,  18 M,  18 C,  18 K of the first unit  100 ; the primary transfer rolls  68 Y,  68 M,  68 C,  68 K of the second unit  200 . Details of the power source unit  300  will be described in [configuration of main parts] below. 
     (Fixing Device) 
     The fixing device  62  is disposed downstream of the secondary transfer roll  60  in a conveyance direction of the sheet member P. The fixing device  62  fixes the toner image transferred onto the sheet member P on the sheet member P. 
     (Image Reading Unit) 
     As shown in  FIGS. 1 and 2 , the image reading unit  90  is disposed in an upper portion of the device housing  10 A, and includes a document conveyance unit  92  that conveys the document, and a document reading unit  94  that reads the document. The document conveyance unit  92  and the document reading unit  94  are connected by a hinge  96 , and when the document conveyance unit  92  rotates about the hinge  96 , the document conveyance unit  92  opens and closes a platen glass (not shown) provided in the document reading unit  94 . 
     The image reading unit  90  reads the image written on the document conveyed by the document conveyance unit  92  or the image written on the document placed on the platen glass. 
     (Image Formation Process) 
     In the image formation device  10  shown in  FIG. 1 , the image is formed on the sheet member P as the example of the recording medium as follows. 
     The image reading unit  90  reads the image written on the document conveyed by the document conveyance unit  92  or the image written on the document placed on the platen glass. 
     The charging roll  24  of each color, to which power is supplied from the power source unit  300  and a voltage is applied, uniformly negatively charges the surface of the image carrier  36  of each color to a set potential. 
     Based on image data of the image read by the image reading unit  90 , the exposure device  22  irradiates the surface of the charged image carrier  36  with the exposure light to form the electrostatic latent image. Thereby, the electrostatic latent image corresponding to the image data is formed on the surface of the image carrier  36  of each color. 
     The development device  33  of each color develops the electrostatic latent image by the development roll  25 , to which power is supplied from the power source unit  300  and a voltage is applied, to visualize the electrostatic latent image as the toner image. 
     The toner image formed on the surface of the image carrier  36  of each color is transferred onto the circulating intermediate transfer belt  66  by the primary transfer roll  68 , to which power is supplied from the power source unit  300  and a voltage is applied. 
     On the other hand, the sheet member P delivered from the accommodation portion  26  to the conveyance path  28  by the delivery roll  30  is delivered to a secondary transfer position T where the intermediate transfer belt  66  and the secondary transfer roll  60  are in contact with each other. At the secondary transfer position T, the sheet member P is conveyed while being sandwiched between the intermediate transfer belt  66  and the secondary transfer roll  60 , whereby the toner image on the surface of the intermediate transfer belt  66  is transferred onto the sheet member P. 
     The toner image transferred onto the sheet member P is fixed on the sheet member P by the fixing device  62 . Then, the sheet member P on which the toner image is fixed is discharged to a discharge unit  11  by the conveyance roll  32 . 
     [Configuration of Main Parts] 
     Next, the first unit  100 , the second unit  200 , the power source unit  300 , attachment and detachment of the first unit  100 , attachment and detachment of the second unit  200 , a power supply mechanism to the first unit  100  and the second unit  200 , and the like, will be described. The first unit  100 , the second unit  200  and the power source unit  300  in the present exemplary embodiment each have a flat box-shaped outer shape. 
     (Arrangement of First Unit, Second Unit and Power Source Unit) 
     As shown in  FIG. 1 , the first unit  100 , the second unit  200  and the power source unit  300  each having a flat box-shaped outer shape are disposed with a thickness direction as the upper-lower direction, and the second unit  200  is disposed between the first unit  100  and the power source unit  300 . From another perspective, the first unit  100 , the second unit  200  and the power source unit  300  disposed with the thickness direction as the upper-lower direction are stacked in the upper-lower direction in an order of the first unit  100 , the second unit  200  and the power source unit  300  from a lower side. 
     The first unit  100  and the second unit  200  is independently attachable to and detachable from the device housing  10 A. That is, the first unit  100  is attachable and detachable regardless of whether the second unit  200  is attached or detached, and the second unit  200  is attachable and detachable regardless of whether the first unit  100  is attached or detached. Specifically, the first unit  100  is attachable and detachable whether the second unit  200  is attached or detached. Similarly, the second unit  200  is attachable and detachable regardless of whether the first unit  100  is attached or detached. 
     As shown in  FIG. 5 , the first unit  100  is attached and detached in the device width direction. An attachment direction of the first unit  100  is an S direction that is the other side direction of the device width direction. The second unit  200  is attached and detached in the device depth direction. An attachment direction of the second unit  200  is an R direction that is a front direction of the device depth direction. 
     (First Unit) 
     As described above, the first unit  100  shown in  FIG. 6  includes the image formation units  18 Y,  18 M,  18 C,  18 K of four colors, and the first unit housing  102  that accommodates the image formation unit  18  of each color. An upper portion of the image carrier  36  of each color included in the image formation unit  18  is exposed upward from an opening provided in the first unit housing  102 . In the first unit housing  102  is provided with a side portion  104  at one end portion in the device width direction, in other words, at a rear end portion in the attachment direction. 
     As shown in  FIGS. 6 and 7 , the side portion  104  is provided with a development contact portion  110  and a charging contact portion  120 , each of which is formed of an electric wire having a spring property. A coil-shaped development winding portion  112  is formed at an upper end portion of the development contact portion  110 , and a coil-shaped charging winding portion  122  is formed at an upper end portion of the charging contact portion  120 . 
     The development winding portion  112  of the development contact portion  110  and the charging winding portion  122  of the charging contact portion  120  each protrude upward from an attachment portion to the side portion  104 . 
     Although only the development contact portion  110  is shown in  FIG. 7 , an upper portion of the charging contact portion  120  has a shape the same as that of an upper portion of the development contact portion  110  except that arrangement positions thereof in the device depth direction are different, as shown in  FIG. 6 . Therefore, the charging winding portion  122  is shown in parentheses as “ 112  ( 122 )” in  FIG. 7 . 
     The development winding portion  112  of the development contact portion  110  and the charging winding portion  122  of the charging contact portion  120  are provided in vicinity of a rear end portion of the first unit  100  in the S direction as the attachment direction of the first unit  100  to the image formation device described below, that is, in vicinity of an end portion of the first unit  100  in a direction opposite to the S direction. 
     As shown in  FIG. 6 , a lower end portion  114  of the development contact portion  110  is routed in the side portion  104  and is in contact with a development terminal portion  118 C electrically connected to the development roll  25 Y (see  FIG. 1 ) of the image formation unit  18 C. The side portion  104  is provided therein with a development branch portion  116  formed of an electric wire having a spring property. The development branch portion  116  is routed in the side portion  104  and is in contact with development terminal portions  118 Y,  118 M,  118 C,  118 K electrically connected to the development rolls  25 Y,  25 M,  25 C,  25 K (see  FIG. 1 ) of the image formation units  18 Y,  18 M,  18 C,  18 K. Therefore, the development contact portion  110  is electrically connected to the development rolls  25 Y,  25 M,  25 C,  25 K (see  FIG. 1 ) via the development branch portion  116  and the development terminal portions  118 Y,  118 M,  118 C,  118 K. 
     As shown in  FIG. 6 , in the side portion  104 , a charging branch portion  126  extends from a lower end portion  124  of the charging contact portion  120 . The charging branch portion  126  is routed in the side portion  104  and is in contact with charging terminal portions  128 Y,  128 M,  128 C,  128 K electrically connected to the charging rolls  24 Y,  24 M,  24 C,  24 K (see  FIG. 1 ) of the image formation units  18 Y,  18 M,  18 C,  18 K. Therefore, the charging contact portion  120  is electrically connected to the charging rolls  24 Y,  24 M,  24 C,  24 K (see  FIG. 1 ) via the charging branch portion  126  and the charging terminal portions  128 Y,  128 M,  128 C,  128 K. 
     (Second Unit) 
     As described above, the second unit  200  shown in  FIGS. 6 and 8  includes the intermediate transfer belt  66 , the primary transfer roll  68  (see  FIG. 1 ), the pair of tension rolls  70  (see  FIG. 1 ) around which the intermediate transfer belt  66  (see  FIG. 1 ) is wound and whose rotation axis direction is the device width direction, and a second unit housing  202  that integrally supports the parts. 
     The second unit housing  202  includes the roll support members  204 A,  204 B that constitute outer end portions of the second unit  200  in the device width direction and support both end portions of the primary transfer roll  68  (see  FIG. 1 ) and the tension roll  70  (see  FIG. 1 ). 
     As shown in  FIG. 6 , the roll support member  204 A of the second unit  200  is provided with a development power supply path  210  and a charging power supply path  220 . The development power supply path  210  and the charging power supply path  220  are provided between an outer end portion  205 A of the roll support member  204 A in the device width direction and an outer end portion  66 A of the intermediate transfer belt  66  in the device width direction. 
     As shown in  FIGS. 6 and 8 , the development power supply path  210  is provided with a development first contact portion  212  exposed toward the power source unit  300 , that is, upward. In the present exemplary embodiment, the development first contact portion  212  is formed of a plate surface whose plate thickness direction is a direction on a power source unit  300  side. The development first contact portion  212  is provided more inward in the device width direction than the outer end portion  205 A on an upper surface  206 A of the roll support member  204 A. 
     Similarly, the charging power supply path  220  is provided with a charging first contact portion  222  exposed toward the power source unit  300 , that is, upward. In the present exemplary embodiment, the charging first contact portion  222  is formed of a plate surface whose plate thickness direction is the direction on the power source unit  300  side. The charging first contact portion  222  is provided more inward in the device width direction than the outer end portion  205 A on the upper surface  206 A of the roll support member  204 A. 
     Although only the development power supply path  210  is shown in  FIG. 7 , the charging power supply path  220  has a shape the same as that of the development power supply path  210  except that arrangement positions thereof in the depth direction are different, as shown in  FIGS. 6 and 8 . Therefore, the charging power supply path  220  is shown in parentheses as “210 ( 220 )” in  FIG. 7 . 
     As shown in  FIGS. 6 and 7 , the development power supply path  210  includes a development second contact portion  214  exposed rearward in the S direction as the attachment direction of the first unit  100 , that is, in the direction opposite to the S direction. In the present exemplary embodiment, the development second contact portion  214  is formed of a plate surface whose plate thickness direction is the S direction. 
     Similarly, the charging power supply path  220  includes a charging second contact portion  224  exposed rearward in the S direction as the attachment direction of the first unit  100 , that is, in the direction opposite to the S direction. In the present exemplary embodiment, the charging second contact portion  224  is formed of a plate surface whose plate thickness direction is the S direction. 
     The development winding portion  112  of the development contact portion  110  and the charging winding portion  122  of the charging contact portion  120  are in contact with the development second contact portion  214  and the charging second contact portion  224 . The development contact portion  110  and the charging contact portion  120  having the spring property are elastically deformed, and the development winding portion  112  and the charging winding portion  122  are in contact with the development second contact portion  214  and the charging second contact portion  224 . 
     As shown in  FIGS. 8 and 9 , a transfer power supply path  230  is provided at an end portion of the roll support member  204 B of the second unit  200  in the R direction as the attachment direction. The transfer power supply path  230  is provided with a transfer contact portion  232  exposed toward an R direction side. In the present exemplary embodiment, the transfer contact portion  232  is formed of a plate surface whose plate thickness direction is the R direction. 
     As shown in  FIG. 10 , a transfer branch portion  234  extending from the transfer power supply path  230  is provided in the roll support member  204 B. The transfer branch portion  234  is routed in the roll support member  204 B and is in contact with transfer terminal portions  238 Y,  238 M,  238 C,  238 K electrically connected to the primary transfer rolls  68 Y,  68 M,  68 C,  68 K (see  FIG. 1 ) of the second unit  200 . Therefore, the transfer power supply path  230  is electrically connected to the primary transfer rolls  68 Y,  68 M,  68 C,  68 K (see  FIG. 1 ) via the transfer branch portion  234  and the transfer terminal portions  238 Y,  238 M,  238 C,  238 K. 
     (Power Source Unit) 
     As shown in  FIG. 6 , the power source unit  300  is provided with a power source side development power supply path  310  and a power source side charging power supply path  320  each formed of an electric wire having a spring property. 
     As shown in  FIGS. 6 and 7 , a coil-shaped development base end portion  312  is formed at an upper end portion of the power source side development power supply path  310 . As shown in  FIG. 7 , the development base end portion  312  is disposed closer to the roll support member  204 A of the second unit  200  than a center position of the power source unit  300  in the device width direction. As shown in  FIGS. 6 and 7 , in the power source side development power supply path  310 , a development shaft portion  315  bent in an L shape extends from the development base end portion  312 , and a power source side development contact portion  314  protrudes toward the second unit  200 , that is, downward, from the development shaft portion  315 . 
     As shown in  FIG. 6 , the power source side development contact portion  314  is bent downward when viewed from the device width direction, and a lower end portion of the power source side development contact portion  314  which is a vertex portion of the bent portion forms a development winding portion  316  (also see  FIG. 7 ) wound in a coil shape. As shown in  FIGS. 6 and 7 , the development winding portion  316  of the power source side development contact portion  314  is in contact with the development first contact portion  212 . The power source side development contact portion  314  having a spring property is elastically deformed, and the development winding portion  316  is in contact with the development first contact portion  212 . 
     When viewed from the device upper-lower direction as the stacking direction, the development winding portion  316  of the power source side development contact portion  314  overlaps the development first contact portion  212 . 
     Although only the power source side development power supply path  310  is shown in  FIG. 7 , the power source side charging power supply path  320  has a shape the same as that of the power source side development power supply path  310  except that arrangement positions thereof in the depth direction are different, as shown in  FIG. 6 . Therefore, the power source side charging power supply path  320  is shown in parentheses as “ 310  ( 320 )” in  FIG. 7 . 
     As shown in  FIGS. 6 and 7 , a coil-shaped charging base end portion  322  is formed at an upper end portion of the power source side charging power supply path  320 . As shown in  FIG. 7 , the charging base end portion  322  is disposed closer to the roll support member  204 A of the second unit  200  than the center position of the power source unit  300  in the device width direction. In the power source side charging power supply path  320 , a charging shaft portion  325  bent in an L-shape extends from the charging base end portion  322 , and a power source side charging contact portion  324  protrudes toward the second unit  200 , that is, downward, from the charging shaft portion  325 . 
     As shown in  FIG. 6 , the power source side charging contact portion  324  is bent downward when viewed from the device width direction, and a lower end portion of the power source side charging contact portion  324  which is a vertex portion of the bent portion forms a charging winding portion  326  (also see  FIG. 7 ) wound in a coil shape. As shown in  FIGS. 6 and 7 , the charging winding portion  326  of the power source side charging contact portion  324  is in contact with the charging first contact portion  222  from above. The power source side charging contact portion  324  having a spring property is elastically deformed, and the charging winding portion  326  is in contact with the development first contact portion  222 . 
     When viewed from the device upper-lower direction as the stacking direction, the charging winding portion  326  of the power source side charging contact portion  324  overlaps the charging first contact portion  222 . 
     As shown in  FIGS. 8 and 9 , the power source unit  300  is provided with a power source side transfer power supply path  330 . A coil-shaped transfer base end portion  332  is formed at an upper end portion of the power source side transfer power supply path  330 . In the power source side transfer power supply path  330 , a transfer shaft portion  335  bent in an L-shape extends from the transfer base end portion  332 , and a power source side transfer contact portion  334  protrudes toward the second unit  200  from the transfer shaft portion  335 . A transfer winding portion  336  wound in a coil shape is formed at a tip portion of the power source side transfer contact portion  334 . The transfer winding portion  336  is in contact with the transfer contact portion  232  of the transfer power supply path  230  of the second unit  200 . 
     (Attachment and Detachment of First Unit) 
     As shown in  FIGS. 2 to 5 , the device housing  10 A includes a first opening and closing door  81  that is opened to one side (a left side in the drawing) in the device width direction. The first opening and closing door  81  includes a first door body  81 A and first hinges  81 B attached to a lower end portion of the first door body  81 A. The first opening and closing door  81  is rotationally moved between a closed position (see  FIG. 2 ) for closing inside of the device housing  10 A and an opened position (see  FIGS. 3 to 5 ) for opening the inside of the device housing  10 A. 
     Then, the first opening and closing door  81  is opened, and the first unit  100  is attached and detached along the device width direction. The attachment direction of the first unit  100  is the S direction that is the other side direction of the device width direction. 
     As shown in  FIG. 7 , when the first unit  100  is attached to the device housing  10 A, the development winding portion  112  of the development contact portion  110  and the charging winding portion  122  of the charging contact portion  120  of the first unit  100  are in contact with the development second contact portion  214  of the development power supply path  210  and the charging second contact portion  224  of the charging power supply path  220  of the second unit  200  (also see  FIG. 6 ). 
     (Attachment and Detachment of Second Unit) 
     As shown in  FIGS. 1, 2, 4 and 5 , a second opening and closing door  82  is provided to open the inside of the device housing  10 A to the back side in the device depth direction. The second opening and closing door  82  includes a second door body  82 A and second hinge  82 B attached to a lower end portion of the second door body  82 A. The second opening and closing door  82  is moved between a closed position (see  FIGS. 1 and 2 ) for closing the inside of the device housing  10 A and an opened position (see  FIGS. 4 and 5 ) for opening the inside of the device housing  10 A. As shown in  FIGS. 4 and 5 , the secondary transfer roll  60  described above is attached to the second opening and closing door  82 . 
     Then, the second opening and closing door  82  is opened, and the second unit  200  is attached and detached along the device depth direction. The attachment direction of the second unit  200  is the R direction that is the front direction of the device depth direction. 
     As shown in  FIG. 7 , when the second unit  200  is attached to the device housing  10 A, the development first contact portion  212  of the development power supply path  210  and the charging first contact portion  222  of the charging power supply path  220  of the second unit  200  are in contact with the development winding portion  316  of the power source side development contact portion  314  of the power source side development power supply path  310  and the charging winding portion  326  of the power source side charging contact portion  324  of the power source side charging power supply path  320  provided in the power source unit  300  (also see  FIG. 6 ). 
     As shown in  FIGS. 9 and 10 , when the second unit  200  is attached to the device housing  10 A, the transfer contact portion  232  of the transfer power supply path  230  of the second unit  200  is in contact with the transfer winding portion  336  of the power source side transfer contact portion  334  of the power source side transfer power supply path  330 . 
     &lt;Operation and Effects&gt; 
     Next, operation and effects of the present exemplary embodiment will be described. 
     When the second unit  200  is attached to the device housing  10 A, the development first contact portion  212  of the development power supply path  210  and the charging first contact portion  222  of the charging power supply path  220  of the second unit  200  are in contact with the development winding portion  316  of the power source side development contact portion  314  of the power source side development power supply path  310  and the charging winding portion  326  of the power source side charging contact portion  324  of the power source side charging power supply path  320  provided in the power source unit  300 . 
     When the first unit  100  is attached to the device housing  10 A, the development winding portion  112  of the development contact portion  110  and the charging winding portion  122  of the charging contact portion  120  of the first unit  100  are in contact with the development second contact portion  214  of the development power supply path  210  and the charging second contact portion  224  of the charging power supply path  220  of the second unit  200 . 
     The development contact portion  110  is electrically connected to the development rolls  25 Y,  25 M,  25 C,  25 K via the development branch portion  116  and the development terminal portions  118 Y,  118 M,  118 C,  118 K. 
     Similarly, the charging contact portion  120  is electrically connected to the charging rolls  24 Y,  24 M,  24 C,  24 K via the charging branch portion  126  and the charging terminal portions  128 Y,  128 M,  128 C,  128  K. 
     In this way, when the first unit  100  and the second unit  200  are attached, the power is supplied from the power source unit  300  to the development rolls  25 Y,  25 M,  25 C,  25 K and the charging rolls  24 Y,  24 M,  24 C,  24 K of the first unit  100  via the development power supply path  210  and the charging power supply path  220  of the second unit  200 . 
     When the second unit  200  is attached, the transfer contact portion  232  of the transfer power supply path  230  of the second unit  200  is in contact with the transfer winding portion  336  of the power source side transfer contact portion  334  of the power source side transfer power supply path  330 . The transfer power supply path  230  is electrically connected to the primary transfer rolls  68 Y,  68 M,  68 C,  68 K via the transfer branch portion  234 . 
     In this way, when the second unit  200  is attached, the power is supplied from the power source unit  300  to the primary transfer rolls  68 Y,  68 M,  68 C,  68 K. 
     The development power supply path  210  and the charging power supply path  220  are provided in the second unit  200 . Therefore, a device width of the image formation device  10  may be reduced as compared with a case where the development power supply path  210  and the charging power supply path  220  are provided in the device housing  10 A. 
     When the first unit  100  is attached to the device housing  10 A, a power supply path from the power source unit  300  to the first unit  100  is formed. Therefore, when the first unit  100  is not attached, the first unit  100  is not energized. 
     The development power supply path  210  and the charging power supply path  220  are provided in the roll support member  204 A of the second unit  200 . Therefore, the device width of the image formation device  10  may be reduced as compared with a case where the development power supply path  210  and the charging power supply path  220  are provided in a member more outward than the development power supply path  210  and the charging power supply path  220 , for example, the device housing  10 A. 
     The development power supply path  210  and the charging power supply path  220  are provided more inward than the outer end portion  205 A of the roll support member  204  that is the outer end portion of the second unit  200  in the device width direction when viewed from the stacking direction. Therefore, the device width of the image formation device  10  may be reduced as compared with a case where the development power supply path  210  and the charging power supply path  220  are provided in the device housing  10 A located outside the outer end portion  205 A of the roll support member  204 . 
     The development power supply path  210  and the charging power supply path  220  are provided between the outer end portion  205 A of the roll support member  204 A in the device width direction and the outer end portion  66 A of the intermediate transfer belt  66  in the device width direction. Therefore, the device width of the image formation device  10  may be reduced as compared with a case where the development power supply path  210  and the charging power supply path  220  are provided outside the outer end portion  205 A of the roll support member  204 A in the device width direction. 
     The development base end portion  312  of the power source side development power supply path  310  and the charging base end portion  322  of the power source side charging power supply path  320  of the power source unit  300  are disposed closer to the roll support member  204 A of the second unit  200  than the center position of the power source unit  300  in the device width direction. Therefore, the device width of the image formation device  10  may be reduced. 
     The device width of the image formation device  10  may be reduced as compared with a case where the development base end portion  312  of the power source side development power supply path  310  and the charging base end portion  322  of the power source side charging power supply path  320  of the power source unit  300  are disposed at the center position in the device width direction. 
     In addition, the development base end portion  312  of the power source side development power supply path  310  and the charging base end portion  322  of the power source side charging power supply path  320  of the power source unit  300  may be shortened. 
     When viewed from the device upper-lower direction as the stacking direction, the development winding portion  316  of the power source side development contact portion  314  overlaps the development first contact portion  212 , and the charging winding portion  326  of the power source side charging contact portion  324  overlaps the charging first contact portion  222 . Therefore, the device width of the image formation device  10  may be reduced as compared with a case where the development winding portion  316  of the power source side development contact portion  314  and the charging winding portion  326  of the power source side charging contact portion  324  are respectively outside the development first contact portion  212  and the charging first contact portion  222  in the device width direction. 
     The power source side development contact portion  314  and the power source side charging contact portion  324  that protrude toward the second unit  200  are formed in the power source side development power supply path  310  and the power source side charging power supply path  320  provided in the power source unit  300 . In the development power supply path  210  and the charging power supply path  220  of the second unit  200 , the development first contact portion  212  and the charging first contact portion  222  in contact with the power source side development contact portion  314  and the power source side charging contact portion  324 , which are exposed toward the power source unit  300 , are provided more inward than the outer end portion  205 A in the device width direction of the roll support member  204  that is the outer end portion of the second unit  200  in the device width direction. Therefore, the device width of the image formation device  10  may be reduced as compared with a case where the development first contact portion  212  of the development power supply path  210  and the charging first contact portion  222  of the charging power supply path  220  of the second unit  200  are provided outside the outer end portion  205 A in the device width direction of the roll support member  204  that is the outer end portion of the second unit  200  in the device width direction. 
     When the second unit  200  is attached, the development first contact portion  212  and the charging first contact portion  222  of the second unit  200  are in contact with the power source side development contact portion  314  and the power source side charging contact portion  324  provided in the power source unit  300 . Therefore, when the second unit  200  is not attached, the first unit  100  is not energized. 
     When the first unit  100  is attached, the development contact portion  110  and the charging contact portion  120  of the first unit  100  are in contact with the development second contact portion  214  and charging second contact portion  224  which are exposed rearward in the S direction at the attachment direction of the first unit  100 . In the present exemplary embodiment, the development second contact portion  214  and the charging second contact portion  224  are each formed of the plate surface whose plate thickness direction is the S direction. Therefore, the device width of the image formation device  10  may be reduced as compared with a case where the development second contact portion  214  and the charging second contact portion  224  are exposed in a direction intersecting the S direction. 
     The development contact portion  110  and the charging contact portion  120  are provided on a rear side in the S direction as the attachment direction of the first unit  100 . Therefore, a movement width of the development contact portion  110  and the charging contact portion  120  in the image formation device  10  when the first unit  100  is attached and detached is small as compared with a case where the development contact portion  110  and the charging contact portion  120  are provided on a front side in the S direction as that attachment direction of the first unit  100 . Therefore, for example, when the first unit  100  is attached and detached, possibility that the development contact portion  110  and the charging contact portion  120  are in contact with other members or the like is reduced. 
     The first unit  100  is provided with the development branch portion  116  and the charging branch portion  126  that branch from the development contact portion  110  and the charging contact portion  120  to supply the power to the image formation unit  18  of each color. Therefore, the number of contact points may be reduced as compared with a case where a contact portion is provided for each image formation unit  18  of each color. 
     When the second unit  200  is attached, the transfer contact portion  232  provided in the second unit  200  is in contact with the power source side transfer contact portion  334  of the power source side transfer power supply path  330  provided in the power source unit  300 , and the power is supplied from the power source unit  300  to the second unit  200 . Therefore, the image formation device  10  may be downsized as compared with a case where a separate power source unit is provided for the second unit  200 . 
     The second unit  200  is provided with the transfer branch portion  234  that branches from the transfer contact portion  232  and supplies the power to the primary transfer roll  68  of each color. Therefore, the number of contact points may be reduced as compared with a case where a contact portion is provided for each primary transfer roll  68  of each color. 
     &lt;Others&gt; 
     The present invention is not limited to the above exemplary embodiment. 
     For example, the first unit  100  is attached and detached in the device width direction and the second unit  200  is attached and detached in the device depth direction in the above exemplary embodiment, but the present invention is not limited thereto. The first unit  100  may be attached and detached in the device depth direction. The second unit  200  may be attached and detached in the device width direction. Attachment and detachment directions of the first unit  100  may be the same as attachment and detachment directions of the second unit  200 . 
     For example, the first unit  100 , the second unit  200  and the power source unit  300  disposed with the thickness direction as the upper-lower direction, are stacked in the order of the first unit  100 , the second unit  200  and the power source unit  300  from the lower side in the above exemplary embodiment, but the present invention is not limited thereto. For example, the first unit  100 , the second unit  200  and the power source unit  300  may be stacked in this order from an upper side. Alternatively, the first unit  100 , the second unit  200  and the power source unit  300  disposed with the thickness direction as the device width direction or the device depth direction may be stacked in the order of the first unit  100 , the second unit  200  and the power source unit  300  in the device width direction or the device depth direction. 
     The second unit  200  may be disposed between the first unit  100  and the power source unit  300 . 
     A configuration of the image formation device is not limited to a configuration in the above exemplary embodiment, and various configurations may be employed. For example, the image formation device  10  forms the image on the recording medium by an electrophotographic method in the above exemplary embodiment, but the present invention is not limited thereto. For example, the present invention may be applied to an image formation device that forms an image on a recording medium by an inkjet method, an electrostatic recording method, a thermal transfer method or the like. 
     It should be understood that various modifications may be made without departing from the scope of the present invention. 
     REFERENCE SIGNS LIST 
     
         
         
           
               10  image formation device 
               10 A device housing 
               18  image formation unit (example of image formation unit) 
               36  image carrier 
               66  intermediate transfer belt (example of intermediate transfer member) 
               66 A outer end portion (example of outer end portion of intermediate transfer belt) 
               68  primary transfer roll (example of transfer roll) 
               70  tension roll 
               100  first unit 
               110  development contact portion (example of first-unit-side contact portion) 
               116  development branch portion (example of first-unit-side branch path) 
               120  charging contact portion (example of first-unit-side contact portion) 
               126  charging branch portion (example of first-unit-side branch path) 
               200  second unit 
               204 A roll support member 
               205 A outer end portion (example of outer end portion of roll support member, example of outer end portion of second unit in device width direction) 
               210  development power supply path (example of power supply path) 
               212  development first contact portion (example of path-side first contact portion) 
               214  development second contact portion (example of path-side second contact portion) 
               220  charging power supply path (example of power supply path) 
               222  charging first contact portion (example of path-side first contact portion) 
               224  charging second contact portion (example of path-side second contact portion) 
               230  transfer power supply path 
               232  transfer contact portion (example of second-unit-side transfer contact portion) 
               234  transfer branch portion (example of second-unit-side branch path) 
               300  power source unit 
               310  power source side development power supply path (example of power-source-side power supply path) 
               312  development base end portion (example of base end portion) 
               314  power source side development contact portion (example of power-source-side first contact portion) 
               320  power source side charging power supply path (example of power-source-side power supply path) 
               322  charging base end portion (example of base end portion) 
               324  power source side charging contact portion (example of power-source-side first contact portion) 
               330  power source side transfer power supply path 
               334  power source side transfer contact portion (example of power-source-side second contact portion) 
             P sheet member (example of recording medium)