JP5470227B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile machine, and a multifunction machine.

  In general, an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multi-function peripheral uses image data read by a scanner provided in the image forming apparatus or image data received by a communication unit provided in the image forming apparatus. An image forming mechanism is provided for realizing a function of forming an image based on the image and printing the image on a sheet. For example, in the case of a laser-type image forming apparatus, the image forming mechanism includes a photosensitive drum, a charging device, an exposure device, a developing device, a transfer device, a fixing device, a paper transport mechanism, a toner cartridge, and the like.

  In general, an image forming apparatus includes a casing that forms an outer shell and accommodates the image forming mechanism. In the casing, an opening is provided on the front surface of the image forming apparatus. A person handling the image forming apparatus can touch the image forming mechanism accommodated in the casing through the opening to perform maintenance of the image forming mechanism.

  A cover for closing the opening of the casing is provided on the front side of the image forming apparatus. The cover is connected to the casing by a hinge or the like, and can be easily opened and closed by a person who handles the image forming apparatus. The cover is closed during normal use, and is opened when maintenance of the image forming mechanism is performed.

  In the image forming apparatus described in Patent Document 1 below, the cover is configured such that the lower part thereof is rotatably supported by the casing and swings around the lower part of the cover supported by the casing as an axis. . Then, the cover rises vertically to close the casing opening, and the cover is inclined so that the upper portion of the cover projects outward from the casing, thereby opening the casing opening (see FIG. (Refer FIG. 3, FIG. 6 of patent document 1).

JP 2003-103870 A JP 2007-206201 A

  By the way, in the image forming apparatus described in Patent Document 1, the cover has a thin plate shape whose outer surface is substantially flat, and the outer surface of the cover does not protrude outward from the outer surface on the front side of the casing. Further, the outer surface of the structure (paper feed cassette) adjacent to the cover on the lower side of the cover does not protrude outward from the outer surface on the front side of the casing. Since the image forming apparatus described in Patent Document 1 has such a structure, the cover can be opened and closed without any trouble while the cover is opened and closed without contacting the structure under the cover. it can.

  On the other hand, from the request of improving the appearance design of the image forming apparatus, for example, as in the image forming apparatus described in Patent Document 2, the outer surface of the cover is largely outside the outer surface on the casing front side. In some cases, the shape protrudes from the top (see FIG. 1 of Patent Document 2). Further, in the image forming apparatus described in Patent Document 2, the outer surface of the structure (paper feed tray) on the lower side of the cover does not protrude outward greatly from the outer surface of the casing. In some cases, the outer surface of the structure on the lower side of the cover is shaped so as to protrude largely outward from the outer surface on the front side of the casing. In this way, when the outer surface of the cover or the outer surface of the structure on the lower side of the cover protrudes largely outward from the outer surface on the front side of the casing, the cover is moved to the lower side of the cover while opening and closing the cover. It may be impossible to open and close the cover.

  For this reason, it is difficult to make the cover and the structure underneath projecting outward while ensuring a structure that allows the cover to be opened and closed. In other words, in order to secure a structure that allows the cover to be opened and closed, the shape of the cover and the shape of the structure below the cover are limited, and the design of the external appearance design of the image forming apparatus is restricted.

  Even when the outer surface of the cover or the outer surface of the structure on the lower side of the cover protrudes outward from the outer surface on the front side of the casing, for example, the cover and the structure on the lower side of the cover are It is possible to avoid contact between the cover and the structure on the lower side of the cover. However, separating the cover and the structure below the cover may impair the appearance design of the image forming apparatus, and may increase the size of the image forming apparatus.

  The present invention has been made in view of the problems described above, for example, and the object of the present invention is to secure the structure that allows the casing cover to be opened and closed, and the shape of the cover or the structure under the cover. An object of the present invention is to provide an image forming apparatus that can increase the degree of freedom of design.

  In order to solve the above problems, a first image forming apparatus of the present invention includes a casing having an opening, a cover for closing the opening of the casing, one end side fixed to the cover, and the other end side being the cover. The other end is pivotally supported by the casing so as to connect the cover and the casing, and the other end rotates with respect to the casing. An arm that is displaceable from a closed state that closes the opening of the casing to an open state that is inclined so that the cover projects outward from the casing and opens the opening of the casing; and Moving means for moving the other end of the arm upward during displacement from the closed state to the open state, the moving means comprising the casing and the front A vertically long hole formed in one of the other end portions of the arm, the base end side is fixed to the other of the casing and the other end portion of the arm, and the distal end side is inserted into the hole portion, A shaft portion that connects the other end portion of the arm to the casing so as to be rotatable and movable in the vertical direction, a first sliding contact portion fixed to the casing, and the other end portion of the arm, A second sliding contact portion that contacts the first sliding contact portion, and the cover is displaced from the closed state to the open state at the first sliding contact portion or the second sliding contact portion. A cam portion is formed to push up the second sliding contact portion with the rotation of the other end portion of the arm in between.

  In the first image forming apparatus of the present invention, when the cover is displaced from the closed position to the open position and the other end of the arm is rotated with respect to the casing, the first sliding contact portion or the second portion is moved. The cam portion formed in the sliding contact portion pushes the second sliding contact portion upward. Thereby, the other end part of the arm to which the second sliding contact part is fixed moves upward. As a result, the cover is lifted in the process in which the cover is displaced from the closed position to the open position. Therefore, even when the cover or the structure below it protrudes to the outside, the cover can be prevented from coming into contact with the structure below when the cover is opened.

  In order to solve the above-described problem, the second image forming apparatus of the present invention is the above-described first image forming apparatus of the present invention, wherein the hole is formed at the other end of the arm, and the shaft portion is The first sliding contact portion is fixed to the casing, the first sliding contact portion extends in the front-rear direction, the lower end side is fixed to the casing, and the upper end side extends upward to contact the second sliding contact portion. And the second sliding contact portion is formed at a lower end side of the other end portion of the arm, and the cam portion is formed at an upper end portion of the protrusion.

  According to the second image forming apparatus of the present invention, when the cover is opened, the cover can be prevented from coming into contact with the structure on the lower side of the cover with a simple structure.

  In order to solve the above problems, a third image forming apparatus of the present invention is the above-described first or second image forming apparatus of the present invention, wherein the casing forms an outer shell of the image forming apparatus, The opening is a front opening formed at a front position of the image forming apparatus, and the cover is a front cover that closes the front opening of the image forming apparatus.

  According to the third image forming apparatus of the present invention, it is possible to prevent the front cover from contacting the structure under the front cover at the front position of the image forming apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of the design about the shape of the structure of the said cover or the said cover lower side can be raised, ensuring the structure which can open and close the cover of a casing.

1 is an external perspective view showing an image forming apparatus according to an embodiment of the present invention. 1 is an external perspective view showing an image forming apparatus according to an embodiment of the present invention with a front cover opened. 1 is an external perspective view showing a front cover and an arm in an image forming apparatus according to an embodiment of the present invention. FIG. 4 is an enlarged view showing a tip portion of an arm of a front cover in the image forming apparatus according to the embodiment of the present invention. FIG. 4 is an explanatory diagram showing a cover support portion and its peripheral portion in the image forming apparatus according to the embodiment of the present invention. It is an enlarged view showing a cover support part in the image forming apparatus according to the embodiment of the present invention. FIG. 5 is an explanatory diagram illustrating a state in which a tip portion of an arm rotates when the front cover is opened and closed in the image forming apparatus according to the embodiment of the present invention. FIG. 6 is an explanatory diagram illustrating a state in which a front cover is opened and closed in the image forming apparatus according to the embodiment of the present invention. It is explanatory drawing which shows the state in which the front cover in the image forming apparatus by a comparative example is contacting the structure of the lower side.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 respectively show an image forming apparatus according to an embodiment of the present invention. FIG. 1 shows a state where the front cover is closed, and FIG. 2 shows a state where the front cover is opened.

  In FIG. 1, an image forming apparatus 1 according to an embodiment of the present invention is, for example, a laser type multi-function machine having an image reading function, a communication function, a copy function, a printing function, a facsimile function, and the like. The image forming apparatus 1 includes a substantially box-shaped casing 2 that forms an outer shell thereof, and a photosensitive drum, a charging device, an exposure device, a developing device, a transfer device, and a transfer drum, as shown in FIG. An image forming mechanism 3 composed of a device, a fixing device, a paper transport mechanism, a toner cartridge and the like is accommodated.

  As shown in FIG. 2, a front opening 2 </ b> A is provided on the front surface of the image forming apparatus 1. A person handling the image forming apparatus 1 inserts his / her hand through the front opening 2A and touches the image forming mechanism 3 accommodated in the casing 2 to perform maintenance of the image forming mechanism 3 (replacement of toner cartridges, clearing a paper jam, cleaning). , Repair, etc.).

  Further, as shown in FIG. 1, a front cover 4 that closes the front opening 2 </ b> A of the casing 2 is provided on the front side of the image forming apparatus 1. As shown in FIG. 2, the front cover 4 is connected to the casing 2 via a pair of arms 5, and can be easily opened and closed by a person who handles the image forming apparatus 1. During normal use, the front cover 4 rises vertically as shown in FIG. 1 and closes the front opening 2A. Hereinafter, this state is referred to as a “closed state”. On the other hand, when the maintenance of the image forming mechanism 3 is performed, the front cover 4 is inclined so that the upper portion of the front cover 4 protrudes outward (front side) from the front of the casing 2 as shown in FIG. The front opening 2A is opened. Hereinafter, this state is referred to as an “open state”. A pair of band-like members 6 are provided between the casing 2 and the front cover 4 for maintaining the front cover 4 in the open state when the front cover 4 is in the open state.

  In addition, a paper feed tray 7 for storing paper is provided at a lower portion in the casing 2. The paper feed tray 7 is formed in a box shape, and can be pulled out from the front of the casing 2 to the outside (front side) when paper is put therein. A front plate portion 7 </ b> A is provided at a position corresponding to the front of the image forming apparatus 1 in the paper feed tray 7. Further, as shown in FIG. 1, the front plate portion 7A is provided with a gripping portion 7B, and a person handling the image forming apparatus 1 can pull out the paper feed tray 7 by gripping and pulling the gripping portion 7B.

  Here, the outer surfaces of the front cover 4 and the front plate portion 7A of the paper feed tray 7 protrude outwardly from the outer surface on the front side of the casing 2. The protruding outer surfaces of the front cover 4 and the front plate portion 7A of the paper feed tray 7 are aligned so as to be substantially flush with each other. Further, the front cover 4 and the front plate portion 7A are arranged so as to be continuously arranged in the vertical direction with a small gap, and the lower end of the front cover 4 and the upper end of the front plate portion 7A are close to each other in the vertical direction. Yes. Since the front cover 4 and the front plate portion 7A are arranged in this way, the appearance design when the image forming apparatus 1 is viewed from the front side is good.

  FIG. 3 shows the front cover 4 and the pair of arms 5. 4 shows the tip of the right arm 5, FIG. 4 (1) is a view of the right arm 5 viewed from the right side, and FIG. 4 (2) is a view of the right arm 5 viewed from the left side. It is.

  In FIG. 3, the pair of arms 5 are members that connect the front cover 4 and the casing 2, one arm 5 is provided on the right side of the front cover 4, and the other arm 5 is provided on the left side of the front cover 4. It has been.

  The base side of the right arm 5 is fixed to the right edge of the back surface side of the front cover 4. Further, the distal end side of the right arm 5 extends in the rear direction of the front cover 4, extends downward of the front cover 4, and then extends in the front direction of the front cover 4. Thereby, the right arm 5 is formed in a substantially U shape as a whole.

  As shown in FIG. 4 (1), a hole 11 is formed in the tip 5 A of the right arm 5. The hole 11 is an oval hole penetrating the tip 5A of the arm 5 and has a shape that is longer in the vertical direction than in the front-rear direction (the left-right direction in FIG. 4 (1)). The diameter dimension of the hole part 11 in the front-rear direction is slightly larger than the diameter dimension of the shaft part 22 described later. More specifically, the difference between the diameter dimension of the hole portion 11 in the front-rear direction and the diameter dimension of the shaft portion 22 allows the arm 5 to rotate and does not allow the arm 5 to move in the front-rear direction. It is about 5 mm to 2 mm. On the other hand, the diameter dimension of the hole part 11 in the vertical direction is significantly larger than the diameter dimension of the shaft part 22 described later. Specifically, the vertical dimension of the hole 11 is set in consideration of the vertical movement distance of the arm 5 relative to the shaft 22 while the front cover 4 is displaced from the closed state to the open state. For example, in this embodiment, it is set to about twice the diameter of the shaft portion 22.

  Further, a sliding contact portion 12 (second sliding contact portion) is formed on the lower end side of the distal end portion 5A of the right arm 5, that is, below the portion where the hole portion 11 is formed in the distal end portion 5A. . As will be described later, the sliding contact portion 12 comes into contact with a cam portion 24 formed on the ridge portion 23 (first sliding contact portion) (see FIG. 7).

  Further, as shown in FIG. 4B, the peripheral edge portion of the hole 11 and the sliding contact portion 12 protrude leftward from the left side surface of the tip portion 5A formed in a plate shape as a whole. Further, a rib 13 protruding leftward from the left side surface is formed on the left side surface of the tip portion 5A. As a result, the peripheral edge portion of the hole portion 11, the sliding contact portion 12, and the rib 13 are thicker than the other portions of the tip portion 5A.

  On the other hand, the left arm 5 has the same structure as the right arm 5 except that the shape of the left arm 5 is bilaterally symmetric with the shape of the right arm 5.

  FIG. 5 shows the cover support portion and its peripheral portion in the image forming apparatus 1, and FIG. 6 shows the cover support portion in an enlarged manner. 7 shows how the front end 5A of the right arm 5 rotates when the front cover 4 is opened and closed, and FIG. 8 shows how the front cover 4 is opened and closed.

  As shown in FIG. 5, cover support portions 21 are respectively provided on the right frame portion 2 </ b> B and the left frame portion 2 </ b> C (see FIG. 2) of the casing 2. Each cover support portion 21 cannot be seen from the outside when the paper feed tray 7 is housed in the casing 2, but can be seen from the outside when the paper feed tray 7 is pulled out as shown in FIG. it can.

  As shown in FIG. 6, the right cover support portion 21 protrudes forward from the right frame portion 2B of the casing 2, and includes a side plate portion 21A having a relatively large area and a bottom plate portion 21B having a relatively small area. It is roughly composed of

  A shaft portion 22 is provided on the side plate portion 21 </ b> A of the right cover support portion 21. The shaft portion 22 is a short cylindrical or columnar member whose base end side is fixed to the right surface of the side plate portion 21 and whose distal end extends rightward from the side plate portion 21A. As shown in FIG. 7A, the shaft portion 22 is inserted with a hole portion 11 formed at the distal end portion 5A of the right arm 5. Thereby, the front-end | tip part 5A of the right arm 5 is connected with respect to the cover support part 21 (casing 2) so that rotation is possible and it can move to an up-down direction.

  Further, a protrusion 23 (first sliding contact portion) is provided on the bottom plate portion 21 </ b> B of the right cover support portion 21. As shown in FIG. 6, the protruding portion 23 extends in the front-rear direction, the lower end side is fixed to the upper surface of the bottom plate portion 21 </ b> B, and the upper end side extends upward. Moreover, the protrusion part 23 is arrange | positioned in the position which opposes the sliding contact part 12 formed in 5 A of front-end | tip parts of the right arm 5 in the up-down direction, as shown in FIG. 7 (1).

  A cam portion 24 is formed at the upper end portion of the ridge portion 23. The cam portion 24 in the present embodiment generally has a shape inclined upward from the front side toward the rear side. Specifically, the front portion of the cam portion 24 is substantially horizontal, and the intermediate portion is gently curved so as to protrude downward, and is inclined upward from the front portion side to the rear portion side of the cam portion 24, and the rear portion Is almost again horizontal. The shape of the cam portion 24 is determined in consideration of the vertical movement of the arm 5 relative to the shaft portion 22 while the front cover 4 is displaced from the closed state to the open state. As shown in FIGS. 7 (1) to (3), the cam portion 24 includes the right arm 5 when the front cover 4 is in the closed state and in the process in which the front cover 4 is displaced from the closed state to the open state. The slidable contact portion 12 formed at the front end portion 5A of the contact portion comes into contact.

  On the other hand, a shaft portion 22, a ridge portion 23, and a cam portion 24 are also formed on the left cover support portion 21. The shaft portion 22, the ridge portion 23 and the cam portion 24 formed on the left cover support portion 21 and the left cover support portion 21 have shapes such as those on the right cover support portion 21 and the right cover support portion 21. Except for the point which is symmetrical with the shape of the formed shaft part 22, the protrusion part 23, and the cam part 24, the shaft part 22, the protrusion part formed on the right cover support part 21 and the right cover support part 21. 23 and the cam portion 24 are the same.

  The front cover 4 can be rotated to the casing 2 by inserting the shaft portions 22 provided in the pair of left and right cover support portions 21 into the hole portions 11 formed in the distal end portions 5A of the pair of left and right arms 5, respectively. It is supported by. When the front end portion 5A of each arm 5 rotates around the shaft portion 22, the front cover 4 rotates with respect to the casing 2, and the front cover 4 is displaced between the closed state and the open state.

  Further, when the front end portion 5A of each arm 5 rotates counterclockwise around the shaft portion 22 while the front cover 4 is displaced from the closed state to the open state, as shown in FIGS. 7 (1) to (3), The slidable contact portion 12 formed at the distal end portion 5 </ b> A of each arm 5 slides on the cam portion 24 formed at the ridge portion 23. As a result, the sliding contact portion 12 is gradually pushed upward by the cam portion 24, and as a result, the front cover 4 and the pair of arms 5 are entirely pushed upward.

  Specifically, first, when the front cover 4 is in the closed state, as shown in FIG. 7A, the distal end portion 5A of each arm 5 is tilted so that its extending direction is horizontal, The slidable contact portion 12 of the front end portion 5 </ b> A of the 5 is in contact with the low and substantially horizontal portion of the front portion of the cam portion 24. At this time, the shaft portion 22 is positioned on the upper side in the hole portion 11, and as a result, the front cover 4 and the pair of arms 5 are at the lowest position as a whole.

  Next, the front cover 4 starts to be displaced from the closed state toward the open state, each arm 5 rotates counterclockwise, and the extending direction of the distal end portion 5A of each arm 5 is, for example, 10 degrees to 30 degrees with respect to the horizontal. When tilted by about 20 degrees, the sliding contact portion 12 of the tip 5A of each arm 5 comes into contact with the upwardly inclined portion of the cam portion 24 as shown in FIG. Thereby, the sliding contact part 12 is pushed up, the shaft part 22 moves to the lower side in the hole part 11, and as a result, the front cover 4 and the pair of arms 5 rise as a whole.

  Next, the front cover 4 is further displaced from the closed state toward the open state, each arm 5 is further rotated counterclockwise, and the extending direction of the distal end portion 5A of each arm 5 is, for example, 40 degrees to the horizontal. When tilted by about 50 degrees, the sliding contact portion 12 of the distal end portion 5A of each arm 5 comes into contact with a high portion of the rear portion of the cam portion 24 as shown in FIG. As a result, the sliding contact portion 12 is further pushed up, and the shaft portion 22 is further moved downward in the hole portion 11. As a result, the front cover 4 and the pair of arms 5 are further raised as a whole.

  Next, when the front cover 4 reaches the open state, as shown in FIG. 7 (4), the extending direction of the distal end portion 5A of each arm 5 becomes about 90 degrees with respect to the horizontal. At this time, the sliding contact portion 12 of the distal end portion 5 </ b> A of each arm 5 is separated from the cam portion 24. And the front-end | tip part 5A of each arm 5 becomes the highest position, As a result, the front cover 4 and a pair of arms 5 become the highest position as a whole.

  In this way, the front cover 4 moves upward together with the pair of arms 5 while the front cover 4 is displaced from the closed state to the open state. As a result, as shown in FIG. 8, despite the fact that the outer surfaces of the front cover 4 and the front plate portion 7A of the paper feed tray 7 protrude greatly outward from the outer surface on the front side of the casing 2, The front cover 4 can be displaced from the closed state to the open state without contacting the front plate portion 7 of the adjacent paper feed tray 7 on the lower side of the front cover 4 (of course, from the open state to the closed state). Can be displaced as well).

  Here, in the image forming apparatus 50 according to the comparative example shown in FIG. 9, the front cover 52 and the arm 53 do not move upward while the front cover 52 is displaced from the closed state toward the open state. Since the outer surface of the front cover 52 and the outer surface of the front plate portion of the sheet feeding tray 54 below the front cover 52 protrude greatly outward from the outer surface on the front side of the casing 51, the front cover 52 changes from the closed state to the open state. During the displacement, the front cover 52 comes into contact with the front plate portion 54A, and the front cover 52 cannot be opened. On the other hand, according to the image forming apparatus 1 according to the embodiment of the present invention, as described above, such inconvenience does not occur.

  As described above, according to the image forming apparatus 1 according to the embodiment of the present invention, the front cover 4 and the front plate portion 7A of the paper feed tray 7 are connected to the front cover 4 while securing the structure that allows the front cover 4 to be opened and closed. The outer surface of can be made a shape that protrudes greatly to the outside. That is, while maintaining a good or convenient opening / closing function of the front cover 4, the degree of freedom in designing the shape of the front cover 4 and the structure under the front cover 4 can be increased. The appearance design can be easily improved.

  Further, according to the image forming apparatus 1 according to the embodiment of the present invention, the front cover 4 can be moved in the vertical direction, so that the vertical position of the front cover 4 with respect to the casing 2 can be easily adjusted.

  In the embodiment described above, the shape of the cam portion 24 is inclined upward while gently curving so that the front portion of the cam portion 24 is substantially horizontal and the intermediate portion protrudes downward, and the rear portion is again substantially horizontal. However, the shape of the cam portion 24 is not limited to this. The shape of the cam portion 24 is determined in consideration of how much the front cover 4 is moved while the front cover 4 is displaced from the closed state to the open state, and how much the front cover 4 is moved. Whether to move upward is determined by the shape of the front cover 4 or the shape of the lower structure of the front cover 4. For example, the intermediate portion of the cam portion 24 may have a shape that is inclined linearly upward from the front portion side to the rear portion side of the cam portion 24.

  In the above-described embodiment, the case where the hole 11 is formed on the arm 5 side and the shaft portion 22 is formed on the casing 2 side is taken as an example. A shaft portion may be formed on the arm 5 side.

  In the above-described embodiment, the case where the cam portion 24 is formed on the casing 2 side is taken as an example. However, the present invention is not limited thereto, and the cam portion may be formed on the arm 5 side.

  In the above-described embodiment, the case where the present invention is applied to the front cover 4 for closing the front opening 2A for maintenance of the image forming mechanism 3 has been described as an example. However, the present invention is not limited thereto. Absent. The present invention can also be applied to a cover that closes another opening provided in the casing 2.

  In the above-described embodiment, the case where the present invention is applied to the front cover 4 provided on the front side of the image forming apparatus 1 has been described as an example. However, the present invention is not limited thereto, and the side surface of the image forming apparatus 1 is used. It can also be applied to other covers provided on the back surface, top surface, and the like.

  In the above-described embodiment, the case where the front cover 4 is prevented from coming into contact with the front plate portion 7A of the lower sheet feeding tray 7 when the front cover 4 is opened and closed is described as an example. The structure that should be avoided from touching may be other than the front plate portion 7A of the paper feed tray 7.

  Further, in the above-described embodiment, the case where the present invention is applied to a multifunction peripheral is taken as an example, but the present invention can also be applied to other image forming apparatuses such as a copying machine, a printer, and a facsimile.

  The present invention can be changed as appropriate without departing from the spirit or concept of the invention which can be read from the claims and the entire specification, and an image forming apparatus accompanying such a change is also a technical idea of the present invention. include.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Casing 2A Front opening part 4 Front cover 5 Arm 5A Tip part 11 Hole part 12 Sliding contact part (2nd sliding contact part)
21 Cover support portion 22 Shaft portion 23 Projection portion (first sliding contact portion)
24 cam

Claims (2)

A casing having an opening;
A cover for closing the opening of the casing;
One end side is fixed to the cover, the other end side extends from the cover, and the other end portion is rotatably supported by the casing, thereby connecting the cover and the casing, and the other end portion is By rotating with respect to the casing, the cover is inclined so that the cover protrudes outward from the casing from the closed state in which the opening of the casing is closed, thereby opening the opening of the casing. An arm that can be displaced to an open state;
A moving means for moving the other end of the arm upward while the cover is displaced from the closed state to the open state;
The moving means is
And long holes in the vertical direction formed in the other end portion of the front Symbol arm,
The base end side is fixed to the casings grayed, the distal end side is inserted into the hole, and a shaft portion connecting the other end of the arm can be and can vertically move pivoted to said casing,
A first sliding contact portion fixed to the casing;
A second sliding contact portion fixed to the other end of the arm and in contact with the first sliding contact portion;
The first slidable contact portion or the second slidable contact portion includes the second slidable contact portion as the other end portion of the arm rotates while the cover is displaced from the closed state to the open state. An image forming apparatus characterized in that a cam portion for pushing up is formed. The image forming apparatus according to claim 1, wherein the second sliding contact portion is formed below the hole portion .

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