Abstract:
An electrical connecting mechanism includes: a first connector disposed at an apparatus main body; a second connector disposed at an optional device, a power feed switch disposed at one among the apparatus main body and the optional device and capable of switching between a connected state and an unconnected state; and an operation element that is disposed in the other one among the apparatus main body and the optional device, and causes a state in which power can be supplied from the apparatus main body to the optional device to be entered by changing the power feed switch to the connected state, when the first connector and the second connector are coupled.

Description:
[0001]    This application is based on and claims the benefit of priority from Japanese Patent Application No. 2010-081621, filed on 31 Mar. 2010, the content of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to an electrical connecting mechanism between an apparatus main body of an image forming apparatus or the like and an optional device, when using the optional device by mounting to the apparatus main body. In addition, the present invention relates to an image forming apparatus having an electrical connecting structure. Furthermore, the present invention relates to an optional device that can be electrically connected by mounting to an image forming apparatus main body. 
         [0004]    2. Related Art 
         [0005]    Among image forming apparatuses such as copying machines and printers that form an image on paper by xerography, there are those in which a paper feeder is added on as an optional device to the image forming apparatus main body. In this case, although the image forming apparatus main body is positioned and placed on the paper feeder, it is necessary to electrically connect both in order to supply power from the image forming apparatus main body side to the paper feeder side that was added on. 
         [0006]    Conventionally, the setup of optional devices such as a paper feeder has often been performed by a specializing serviceman, and the electrical connection between the optional device and the image forming apparatus main body has been performed exclusively using electrical wires. 
         [0007]    However, in recent years, there has been an increasing trend of users performing the setup of optional devices. As a result, the electrical connection between the optional device and the image forming apparatus main body has been performed using drawer connectors, which completely do not require wiring by electrical wires. 
         [0008]    In a case of using drawer connectors in this way, there is an opportunity for the drawer connector to be damaged when the drawer connector of the optional device side is projecting, for example, by the image forming apparatus main body hitting the drawer connector when the user installs the image forming apparatus main body on the optional device. 
         [0009]    Therefore, a configuration has been proposed in which the drawer connector stays inside the optional device standing alone (in a state without the image forming apparatus main body placed thereon), and when the image forming apparatus main body is installed thereon, the drawer connector projects to a connecting position by the linking of this operation, and is connected to the drawer connector of the image forming apparatus main body side. 
         [0010]    According to the above proposed configuration, the problem of damage does not arises due to the drawer connector of the optional device side being sheltered when installing the image forming apparatus main body to the optional device. 
         [0011]    However, in the above proposed configuration, there is a possibility of a malfunction occurring in that power is supplied from the image forming apparatus main body side to the optional device side even in a state in which the drawer connector of the image forming apparatus main body side and the drawer connector of the optional device side are incompletely connected. 
       SUMMARY OF THE INVENTION 
       [0012]    An object of the present invention is to provide an electrical connecting mechanism that can suppress malfunction due to a poor connection between the drawer connectors of the apparatus main body side and the optional device side from occurring. 
         [0013]    In addition, another object of the present invention is to provide an image forming apparatus having the above-mentioned electrical connecting mechanism. 
         [0014]    Furthermore, another object of the present invention is to provide an optional device that mounts to an image forming apparatus main body and can be configured with the above-mentioned electrical connecting mechanism. 
         [0015]    According to a first aspect of the present invention, 
         [0016]    an electrical connecting mechanism includes: a first connector disposed at an apparatus main body; 
         [0017]    a second connector disposed at an optional device; 
         [0018]    a power feed switch disposed in one among the apparatus main body and the optional device and capable of switching between a connected state and an unconnected state; and 
         [0019]    an operation element that is disposed in the other one among the apparatus main body and the optional device, and 
         [0020]    causes a state in which power can be supplied from the apparatus main body to the optional device to be entered by changing the power feed switch to the connected state, when the first connector and the second connector are coupled accompanying the optional device being mounted to the apparatus main body. 
         [0021]    According to a second aspect of the present invention, 
         [0022]    an image forming apparatus includes: an image forming apparatus main body; 
         [0023]    an option device detachably mounted to the image forming apparatus main body; and 
         [0024]    an electrical connecting mechanism having: a first connector disposed at the image forming apparatus main body, 
         [0025]    a second connector disposed at the optional device, 
         [0026]    a power feed switch disposed in one among the image forming apparatus main body and the optional device and capable of switching between a connected state and an unconnected state, and 
         [0027]    an operation element that is disposed in the other one among the image forming apparatus main body and the optional device, and 
         [0028]    causes a state in which power can be supplied from the apparatus main body to the optional device to be entered by changing the power feed switch to the connected state, when the first connector and the second connector are coupled. 
         [0029]    According to a third aspect of the present invention, 
         [0030]    in an optional device equipped to an imaging forming apparatus main body having a first connector and a power feed switch capable of switching between a connected state and an unconnected state, the optional device includes: 
         [0031]    a second connector; and 
         [0032]    an operation element that causes a state in which power can be supplied from the image forming apparatus main body to the optional device to be entered by changing the power feed switch to the connected state, when the first connector and the second connector are coupled accompanying mounting the optional device to the image forming apparatus main body. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0033]      FIG. 1  is a perspective view of an image forming apparatus according to the present invention; 
           [0034]      FIG. 2  is a perspective view of a paper feeder as an optional device; 
           [0035]      FIG. 3A  is a front view illustrating a sequence of installing an image forming apparatus main body onto a paper feeder; 
           [0036]      FIG. 3B  is a front view illustrating a sequence of installing an image forming apparatus main body onto a paper feeder; 
           [0037]      FIG. 4A  is an explanatory view for operations of an electrical connecting mechanism according to the present invention; 
           [0038]      FIG. 4B  is an explanatory view for operations of the electrical connecting mechanism according to the present invention; 
           [0039]      FIG. 4C  is an explanatory view for operations of the electrical connecting mechanism according to the present invention; 
           [0040]      FIG. 5  is a perspective view of a drawer connector movement mechanism part of the electrical connecting mechanism according to the present invention; and 
           [0041]      FIG. 6  is an exploded perspective view of a drawer connector movement mechanism part of the electrical connecting mechanism according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0042]    Embodiments of the present invention will be explained hereinafter based on the attached drawings. 
         [0043]      FIG. 1  is a perspective view of an image forming apparatus according to the present invention.  FIG. 2  is a perspective view of a paper feeder, which is an optional device.  FIG. 3A  is a front view illustrating a sequence of installing the image forming apparatus main body onto the paper feeder.  FIG. 3B  is a front view illustrating a sequence of installing the image forming apparatus main body onto the paper feeder.  FIG. 4A  is an explanatory view for operations of an electrical connecting mechanism according to the present invention.  FIG. 4B  is an explanatory view for operations of the electrical connecting mechanism according to the present invention.  FIG. 4C  is an explanatory view for operations of the electrical connecting mechanism according to the present invention.  FIG. 5  is a perspective view of a drawer connector movement mechanism part of the electrical connecting mechanism according to the present invention.  FIG. 6  is an exploded perspective view of the drawer connector movement mechanism part of the electrical connecting mechanism according to the present invention. 
         [0044]    The image forming apparatus  1  shown in  FIG. 1  is a multifunction peripheral (MFP) equipped with a copying function, printer function and facsimile function. The image forming apparatus  1  is configured by an image forming apparatus main body  2  and a paper feeder (PF)  3 , which is an optional device. The paper feeder  3  is installed on a floor surface, and the image forming apparatus main body  2  is installed to be stacked on the paper feeder  3 . 
         [0045]    An image reading device  4  is disposed on top of the image forming apparatus main body  2  in the vertical direction. An image forming portion  5  is disposed in the image forming apparatus main body  2  below the image reading device  4  in the vertical direction. Various process equipment that is not illustrated, such as photoreceptor drums, charging units, an optical scanning device such as a laser beam scanner (LSU), a developing device, a transfer device, a fusing device, and cleaning devices, are housed in the image forming portion  5 . 
         [0046]    In addition, an operational display portion  4   a  is provided on the front side of the image reading device  4 . Furthermore, a receiving tray  6  is formed between the image reading device  4  and the image forming portion  5 . 
         [0047]    Then, two levels of upper and lower paper feeding cassettes  8 , which can be pulled out to the front side of  FIG. 1 , are provided to the image forming portion  5 . Several sheets of paper are stored in each of the paper feeding cassettes  8 , respectively. 
         [0048]    On the other hand, the paper feeder  3  has two levels of an upper and lower paper feeding cassette  9  and  10 , which can be pulled out to the front side (in  FIGS. 1 and 2 ), provided thereto, as shown in  FIG. 2 . Several sheets of paper are stored in each of the paper feeding cassettes  9  and  10 . 
         [0049]    Then, locking pawls  11  (only  3  illustrated in  FIG. 2 ) are provided at each of the four corners on a top surface of this paper feeder  3 , which is a surface on which the image forming apparatus main body  2  is placed. In addition, positioning pins  12  and  12  are provided to be standing on the left and right of the top surface at the back side in  FIG. 2 . A vertically movable main body detection lever  13 , which configures a portion of the electrical connecting mechanism according to the present invention, projects vertically between these positioning pins  12 . 
         [0050]    It should be noted that, although not illustrated, positioning holes into which the positioning pins  12  and  12  are inserted are formed at locations on the bottom surface of the image forming apparatus main body  2  corresponding to the positioning pins  12  and  12 . 
         [0051]    Herein, the configuration of the electrical connecting mechanism according to the present invention will be explained hereinafter based on  FIGS. 4A to 6 . 
         [0052]    As shown in  FIGS. 4A to 4C , a drawer connector  14  and a power feed switch  15  are fixedly installed to a bottom portion of the image forming apparatus main body  2 . The power feed switch  15  is disposed on a side of the image forming apparatus main body  2  opposing the paper feeder  3 . 
         [0053]    This drawer connector  14  and power feed switch  15  are housed inside of the image forming apparatus main body  2 , and do not project from the bottom surface of the image forming apparatus main body  2 . 
         [0054]    In contrast, the drawer connector  16  (second connector) supported to be vertically movable is provided to the paper feeder  3 , as shown in  FIGS. 4A to 4C . The drawer connector  16  is disposed on a side of the paper feeder  3  opposing the image forming apparatus main body  2 . This drawer connector  16  stays inside of the paper feeder  3  and does not project from the top surface of the paper feeder  3  as shown in  FIG. 4A  in a state prior to the image forming apparatus main body  2  being installed on the paper feeder  3  (stand-alone state shown in  FIGS. 2 and 3A ). 
         [0055]    Then, the drawer connector  16  is configured so as to move to the side of the image forming apparatus main body  2  when causing the image forming apparatus main body  2  and the paper feeder  3  to couple. When the image forming apparatus main body  2  is placed on the paper feeder  3  and set as shown in  FIG. 3B , the drawer connector  16  rises up to a connecting position by way of the drawer connector movement mechanism part which operates in tandem with this operation (shown in  FIGS. 4A to 6 ). Then, the drawer connector  16  projects from the top surface of the paper feeder  3  as shown in  FIG. 4B , and connects to the drawer connector  14  (first connector) of the image forming apparatus main body  2  side. 
         [0056]    In the present embodiment, after the drawer connector  14  and the drawer connector  16  are connected together as described above, i.e. after all of the connector pins provided to this drawer connector  14  and drawer connector  16 , respectively, are reliably electrically coupled, the image forming apparatus  1  makes power supply from the image forming apparatus main body  2  side to the paper feeder  3  side possible by using a final downward stroke of the image forming apparatus main body  2  to set the power feed switch  15  to an ON state, as shown in  FIG. 4C . 
         [0057]    Herein, the configuration and operations of the drawer connector movable mechanism part for causing the drawer connector  16  of the paper feeder  3  side to rise up to the connecting position in tandem with an installation operation of the image forming apparatus main body  2  will be explained. 
         [0058]    A housing  17  of a rectangular box shape having a top and bottom that are penetrated (opened) is mounted to the center in the width direction of a rear face of the paper feeder  3  in  FIGS. 1 and 2 . The main body detection lever  13  and a slider  18  of a rectangular block shape are each retained to be stored inside of this housing  17  to be vertically movable. The slider  18  is configured so as to move to the image forming apparatus main body  2  side when causing the image forming apparatus main body  2  and the paper feeder  3  to couple. 
         [0059]    As shown in  FIG. 6 , a rectangular window  17   a  and circular hole  17   b , elongated hole  17   c  that is long in the vertical direction, and a locking pawl  17   d  are formed in the above-mentioned housing  17 . 
         [0060]    An engaging hole  13   a  of a horizontal trapezoidal shape is formed in the main body detection lever  13 . 
         [0061]    A pin boss  18   a  that penetrates the elongated hole  17   c  of the housing  17  is integrally established (provided) to project in the front face of the slider  18 . In addition, an operation element  18   b  of a protruding shape that presses the power feed switch  15  provided to the image forming apparatus main body  2  side and causes this to turn ON is integrally established (provided) to be standing at an end of the slider  18  on a top surface. The drawer connector  16  and the operation element  18   b  are disposed at the slider  18 . 
         [0062]    In addition, a link  19  is rotatably disposed at the exterior of the housing  17 . A pin  19   a  is established to project at an end of this link  19 , a pivot shaft  19   b  (refer to  FIG. 4 ) is established (provided) to project in a middle portion thereof, and an elongated hole  19   c  and locking pawl  19   d  are formed at the other end thereof. Then, this link  19  is rotatably supported about the pivot shaft  19   b  to the housing  17  by the pivot shaft  19   b  formed therein being inserted and retained in the circular hole  17   b  formed in the housing  17 . 
         [0063]    Furthermore, the pin  19   a  formed in the link  19  is disposed inside of the housing  17  by penetrating the rectangular window  17   a  formed in the housing  17 , and is disposed to be engaged with the engaging hole  13   a  of the main body detection lever  13  retained to be housed inside of the housing  17  to be vertically movable. 
         [0064]    In addition, the pin boss  18   a  of the slider  18  retained to be stored inside of this housing  17  to be vertically movable projects to outside of the housing by penetrating the elongated hole  17   c  of the housing  17 , and the projecting part thereof is disposed to be engaged with the elongated hole  19   c  formed in the link  19 . 
         [0065]    Then, the link  19  is biased in a clockwise direction (direction upwardly biasing the main body detection lever  13 ) in  FIG. 4  about the pivot shaft  19   b  by a spring  20  having both ends locked to the locking pawl  19   d  formed thereto and the locking pawl  17   d  formed in the housing  17 , respectively. 
         [0066]    Furthermore, in a state prior to the image forming apparatus main body  2  being placed on the paper feeder  3 , as shown in  FIGS. 3A and 4A , the link  19  pushes up the main body detection lever  13  by being biased by the spring  20  as previously described, a result of which the main body detection lever  13  is maintained in a state vertically projected from the top surface of the paper feeder  3 . 
         [0067]    When the image forming apparatus main body  2  is moved downward from the above-mentioned state by causing a positioning hole that is not illustrated formed in the bottom surface of the image forming apparatus main body  2  to engage the positioning pin  12  of the paper feeder  3  side, the bottom surface of the image forming apparatus main body  2  abuts (touches) the main body detection lever  13  of the paper feeder  3  side and pushes this down against the resilience of the spring  20 . The link  19  is thereby pivoted in the counter-clockwise direction as shown in  FIG. 4B  about the pivot shaft  19   b.    
         [0068]    When this is done, the slider  18  of which the pin boss  18   a  engages in the elongated hole  19   c  of the link  19  rises inside of the housing  17 . The drawer connector  16  mounted to the slider  18  thereby projects upward from the top surface of the paper feeder  3  by rising up to the connecting position, and is connected to the drawer connector  14  of the image forming apparatus main body  2  side. 
         [0069]    Then, after connector pins of the drawer connector  14  and the drawer connector  16  have reliably coupled by the image forming apparatus main body  2  being completely placed on the paper feeder  3 , as shown in  FIGS. 3B and 4C , when the slider  18  ascends (rises) due to the final stroke of the image forming apparatus main body  2  finally descending, the operation element  18   b  provided to the slider  18  presses the power feed switch  15  provided on the image forming apparatus main body  2  side and makes this enter the ON state. 
         [0070]    In other words, when the drawer connector  14  and the drawer connector  16  are coupled, the operation element  18   b  presses the power feed switch  15  and causes it to enter the ON state in which power can be supplied from the image forming apparatus main body  2  to the paper feeder  3 . 
         [0071]    In addition, the operation element  18   b  moves to the power feed switch  15  side accompanying movement of the drawer connector  16 , and presses the power feed switch  15  when the drawer connector  14  and the drawer connector  16  are coupled, thereby causing it to enter the ON state in which electrical power can be supplied from the image forming apparatus main body  2  to the paper feeder  3 . 
         [0072]    Furthermore, in a case of causing the image forming apparatus main body  2  and the paper feeder  3  to couple, after the drawer connector  14  and the drawer connector  16  have coupled, the operation element  18   b  is configured so as to further move by a predetermined distance and press the power feed switch  15 . 
         [0073]    Power supply from the image forming apparatus main body  2  side to the paper feeder  3  side thereby becomes possible. In addition, when the image forming apparatus main body  2  is completely placed on the paper feeder  3  and is set as shown in  FIG. 3B , the four locking pawls  11  (refer to  FIG. 2 ) projecting at the top surface of the paper feeder  3  are engaged with the positioning holes, which are not illustrated, formed in the bottom surface of the image forming apparatus main body  2 . The image forming apparatus main body  2  and the paper feeder  3  are thereby integrally coupled. 
         [0074]    Herein, in a state in which the image forming apparatus main body  2  and the paper feeder  3  are coupled, the operation element  18   b  of the present embodiment presses (continually presses) the power feed switch  15  to maintain the ON state. Then, in a case of the coupling between the image forming apparatus main body  2  and the paper feeder  3  being released, the operation element  18   b  releases the pressing of the power feed switch  15  in a state in which the drawer connector  14  and the drawer connector  16  are coupled, whereby the power feed switch  15  is made to switch from the ON state to an OFF state in which power cannot be supplied from the image forming apparatus main body  2  to the paper feeder  3 . In other words, the coupling between the drawer connector  14  and the drawer connector  16  is released after the power feed switch  15  has entered the OFF state. 
         [0075]    In the above way, the image forming apparatus  1  of the present embodiment is configured such that the power feed switch  15  does not turn ON unless the image forming apparatus main body  2  is installed on the paper feeder  3  and the drawer connector  14  and the drawer connector  16  are reliably connected. A high degree of safety is guaranteed in the image forming apparatus  1 , without power being supplied from the image forming apparatus main body  2  to the paper feeder  3  in a state in which the connection between the drawer connector  14  and the drawer connector  16  is incomplete. 
         [0076]    In addition, the drawer connector  16  of the paper feeder  3  side stays inside of the paper feeder  3  and does not project from the top surface in a state prior to the image forming apparatus main body  2  being installed thereon. The drawer connector  16  is connected to the drawer connector  14  of the image forming apparatus main body  2  side by moving to the connection position in tandem with the installation operation of the image forming apparatus main body  2 , without being damaged when installing the image forming apparatus main body  2  on the top surface of the paper feeder  3 . 
         [0077]    Although a mode of equipping an optional device below an image forming apparatus main body has been explained above, the present invention can be applied also to an optional device such as a paper feeding device equipped on a side surface of the image forming apparatus main body or a post-processing device. 
         [0078]    It should be noted that, although a mode of applying the present invention to a multifunction printer has been explained above, the present invention naturally can be similarly applied also to any other image forming apparatus such as a photocopying machine or printer as a single unit or other electronic equipment.