JP2018165044A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device capable of avoiding breakage of a dustproof cover even if a housing in the upper part of an image forming device body is opened when the dustproof cover is at a position deviated from a specified position.SOLUTION: When a second engagement part 34E is disengaged from a first engagement part 33B, and a dustproof cover 34 is at a third position which is on a lower cover 33, the direction of a pushing force F4 extending in a direction passing from a first contact part C1 of the second housing 4 and the dustproof cover 34 when the dustproof cover 34 is pushed by the second housing 4 by the rotation of the second housing 4 from a closed position to an open position, through a second contact part C2 of an extension part 34J and the lower cover 33 is more upward than a normal line N to a contat surface of the lower cover 33 in the second contact part C2.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an image forming apparatus.

  2. Description of the Related Art Conventionally, some image forming apparatuses that form an image on a sheet include a feeding tray that supports the sheet obliquely on the back surface and supplies the sheet into the image forming apparatus. The feeding tray is configured to be capable of supporting at least one sheet, and the sheet supply unit is exposed to the outside.

  When such an image forming apparatus is used in an environment where dust is flying, dust enters the image forming apparatus from the supply unit of the feeding tray. The invading sand dust adheres to a driving unit such as a roller or a gear, thereby increasing a driving load and further causing a failure. Therefore, it is conceivable to prevent dust from entering the image forming apparatus from the sheet supply unit by providing a dustproof cover that covers the feeding tray.

  Here, it is desirable that the dust cover is detachable. This is because by removing the dustproof cover during transportation, it is possible to reduce the size and to prevent the dustproof cover from being damaged. Further, if the dustproof cover is removed when the image forming apparatus is used in an environment where there is no possibility of dust or the like entering, it can be used in a miniaturized state. Furthermore, it is desirable that the dust cover can be rotated. This is because the sheet can be replenished without removing the dust cover, and is easy to use.

  For example, Patent Document 1 has a configuration in which a dustproof cover is detachably and rotatably attached by inserting a protrusion formed on the lower end of the dustproof cover into a through hole formed in the image forming apparatus main body. It is disclosed.

JP 2002-128365 A

  Here, in a configuration in which the dustproof cover is detachable as in Patent Document 1, the dustproof cover may fall into a gap between the image forming apparatus main body and the feeding tray by mistake. When the reading unit at the top of the image forming apparatus main body is opened in this state, the dust cover may be crushed between the reading unit and the feeding tray and may be damaged.

  The present invention provides an image forming apparatus capable of avoiding damage to a dustproof cover even when the upper housing of the image forming apparatus main body is opened when the dustproof cover is at a position deviated from a specified position. Objective.

  An image forming apparatus according to the present invention includes a first housing that houses an image forming unit that forms an image on a sheet, and the first housing that is disposed above the first housing and that has a first rotation axis as a center. A second casing rotatable between a closed position covering the upper part of the body and an open position opening the upper part of the first casing; and the first rotation of the first casing and the second casing. A feeding tray disposed on a side surface on the dynamic axis side, wherein the feeding tray has an inclined sheet supporting surface that supports a sheet fed into the first housing, and the sheet A first surface of the first housing and the second housing of the support surface, which is disposed to face a side surface portion of the first rotation axis side, and has a first engagement portion on the side surface opposite to the seat support surface. A cover, a second engagement portion that is detachably and rotatably engageable with the first engagement portion, and the seat support surface. And a second cover that covers at least a part of the sheet support surface, and the second cover is detachable from the first cover in a predetermined direction. The second engagement portion is disengaged from the first engagement portion, and is rotatable between a first position covering the sheet support surface and a second position opening the sheet support surface. When the cover is in the third position on the first cover, the second cover is pushed against the second casing by rotating the second casing from the closed position toward the open position. The direction of the pressing force extending from the first contact portion between the second housing and the second cover to the direction passing through the second contact portion between the extension portion and the first cover is 2 above the normal to the contact surface of the first cover at the contact portion. .

  According to the above configuration, when the second housing is opened with the second cover falling between the first housing and the first cover, the second cover is in contact with the first cover. Lifted along.

  According to the present invention, even when the second cover is opened with the second cover falling between the first casing and the first cover, the second cover remains on the contact surface of the first cover. Therefore, the second cover is not crushed and damage to the second cover can be avoided.

1 is a perspective view of a multifunction machine according to an embodiment. It is a perspective view of the back surface feeding tray of one Embodiment. It is a front side perspective view of the dustproof cover of one embodiment. It is a back side perspective view of the dustproof cover of one embodiment. It is side surface sectional drawing of a back surface feeding tray in case a dust-proof cover exists in a 1st position. It is side surface sectional drawing of a back surface feeding tray in case a dust-proof cover exists in a 2nd position. FIG. 10 is a partial right side view of the multifunction machine showing a state in which the second housing is in the closed position and the second sheet support portion is between the use position and the storage position. FIG. 8 is a partial right side view of the multifunction peripheral showing a state in the middle of the second housing being rotated from the state of FIG. 7 toward the open position. FIG. 9 is a partial right side view of the multifunction peripheral showing a state where the second housing has reached the open position from the state of FIG. 8. FIG. 6 is a partial side cross-sectional view of the multifunction peripheral showing a state where the second housing is in the closed position and the dust cover is in the third position. FIG. 11 is a partial side cross-sectional view of the multifunction peripheral showing a state in the middle of the second housing being rotated from the state of FIG. 10 toward the open position. FIG. 12 is a partial side cross-sectional view of the multi-function peripheral showing a state where the second housing is rotating from the state of FIG. 11 toward the open position. It is a front side perspective view of the dustproof cover of modification 1. It is side surface sectional drawing of the dust-proof cover of the modification 1. It is a figure explaining the lower cover of the modification 2. It is a right view of the dustproof cover of the modification 3. It is a principal part enlarged view of FIG.

  In the following description, as shown in FIG. 1, the front-rear direction, the left-right direction, and the up-down direction are defined with reference to a state where the multi-function device 1 is installed.

[Overall configuration of MFP]
A multifunction device 1 shown in FIG. 1 is an embodiment of a multifunction device including an image forming apparatus according to the present invention. The multifunction device 1 has a printer function, a scanner function, a copy function, a facsimile function, and the like. The multifunction machine 1 includes a first housing 2 as an example of an image forming apparatus housing, a second housing 4, and a rear feeding tray 3 as an example of a feeding tray.

  The first housing 2 is formed in a substantially rectangular parallelepiped shape, and includes a printer unit P having an image forming unit 20 that forms an image on a sheet, and a scanner unit S disposed above the printer unit P. The printer unit P is configured as an ink jet recording type printer. The scanner unit S is configured as a flatbed scanner.

  In the printer unit P, various storage media such as image data read by the scanner unit S, external devices such as a computer, digital camera, and USB memory connected to the multifunction device 1, and a memory card attached to the multifunction device 1. An image is formed on a sheet such as a recording sheet based on the image data input from.

  An opening 21 is formed in the left and right central portion of the front surface of the first housing 2. In the opening 21, a front feeding tray 22 that supports sheets in a substantially horizontal posture and a discharge tray 23 formed on the upper surface of the front feeding tray 22 are provided. In addition, an operation panel 24 having a display unit that displays the state and functions of the multifunction device 1 and an operation unit that performs input operations on the multifunction device 1 is provided on the front surface of the first housing 2. In addition to the front feeding tray 22, a front tray that supports one or more sheets and supplies the sheets to the printer unit P may be provided on the front surface of the first housing 2.

  The second housing 4 is a substantially rectangular parallelepiped housing whose front-rear and left-right sizes are approximately the same as the upper surface of the first housing 2, and the upper surface of the first housing 2 is above the first housing 2. It is provided so as to cover. The rear end portion of the second housing 4 is connected to the rear end portion of the first housing 2 so as to be vertically rotatable by a connecting portion 4A (see FIG. 7) having a first rotation axis R1 extending in the left-right direction. ing. 4 A of connection parts can be comprised by the rotating shaft part which consists of a column-shaped convex part etc., and the support part which consists of a cylindrical-shaped recessed part. As a result, the second housing 4 rotates between the closed position that covers the top of the first housing 2 and the open position that opens the top of the first housing 2 around the first rotation axis R1. It is possible.

  The second housing 4 includes an ADF (Automatic Document Feeder) that separates a plurality of documents one by one, conveys them to the scanner unit S, and discharges them. Accordingly, the scanner unit S can automatically read a plurality of documents one by one.

  The back surface feeding tray 3 is provided on the back surface, which is the side surface of the first housing 2 on the first rotation axis R1 side. The rear feeding tray 3 supports one or more sheets 18 and supplies the sheets 18 to the printer unit P.

[Configuration of rear feed tray]
2 is a perspective view of the rear feeding tray 3, FIG. 3 is a front perspective view of the dust cover 34, FIG. 4 is a rear perspective view of the dust cover 34, and FIG. 5 is a case where the dust cover 34 is in the first position. FIG. 6 is a side sectional view of the rear feeding tray 3, and FIG. 6 is a sectional side view of the rear feeding tray 3 when the dust cover 34 is in the second position.

  As shown in FIG. 2, the rear feeding tray 3 includes a tray support portion 31, a sheet support portion 32, a lower cover 33 as an example of a first cover, and a dustproof cover 34 as an example of a second cover. I have. The rear feeding tray 3 is also provided with a feeding mechanism such as a feeding roller for feeding a sheet supported by the tray support unit 31 to the printer unit P. However, since it is a known mechanism, description thereof is omitted. To do.

(Tray support)
The tray support portion 31 is a member that is provided on the back surface of the first housing 2 and supports the sheet support portion 32 and the lower cover 33. The tray support portion 31 includes a pair of side wall portions 31A that are spaced apart from each other and disposed on the left and right sides, and a rear side surface portion 31B that is disposed between the pair of side wall portions 31A.

(Sheet support part)
As illustrated in FIG. 5, the sheet support portion 32 includes a first sheet support portion 32A and a second sheet support portion 32B. The first sheet support portion 32A is disposed between the pair of side wall portions 31A and connected to the side wall portion 31A. The first sheet support portion 32 </ b> A has a first sheet support surface 32 </ b> C that supports a sheet supplied into the first housing 2. The lower end portion of the first sheet support portion 32A is rotatably connected to the side wall portion 31A by a connecting portion 32D having a fourth rotation axis R4 parallel to the first rotation axis R1. The connecting portion 32D can be constituted by a rotating shaft portion made of a columnar convex portion or the like and a support portion made of a cylindrical concave portion or the like.

  As a result, the first sheet support portion 32A has a use position where the first sheet support surface 32C can support the sheet in cooperation with the second sheet support surface around the fourth rotation axis R4 (state shown in FIG. 5). ) And the storage tip closest to the second housing 4 where the rotation tip 32E of the first sheet support surface 32C is rotatable. In the use position, the first seat support portion 32A is supported in an inclined posture toward the rear as it goes upward, and extends rearward and obliquely upward from the rear side surface portion 31B.

  The second sheet support portion 32B is connected to the upper end portion of the first sheet support portion 32A. The second sheet support part 32 </ b> B has a second sheet support surface 32 </ b> F that supports the sheet supplied into the first housing 2. The lower end portion of the second sheet support portion 32B is rotatably connected to the upper end portion of the first sheet support portion 32A by a connecting portion 32G having a second rotation axis R2 parallel to the first rotation axis R1. The connecting portion 32G can be configured by a rotating shaft portion made of a columnar convex portion or the like and a support portion made of a cylindrical concave portion or the like.

  As a result, the second sheet support portion 32B has a use position where the second sheet support surface 32F can support the sheet in cooperation with the first sheet support surface 32C around the second rotation axis R2 (see FIG. 5). State) and the rotation position 32H of the second sheet support surface 32F is rotatable between the storage position closest to the second housing 4. In the use position, the second sheet support portion 32B is supported substantially parallel to the first sheet support portion 32A in the use position.

  In addition, the sheet | seat support part 32 can also be set as the form which is not accommodated in an accommodation position. For example, the first sheet support portion 32A and the second sheet support portion 32B may be integrated into one sheet support portion and fixed at the use position.

  As shown in FIG. 2, the second sheet support surface 32 </ b> F is provided with a pair of side guides 35 that can move in the left-right direction and align the position of the sheet 18 in the width direction. In the rear feeding tray 3, the sheet width is adjusted by moving the side guide 35 in the left-right direction according to the size in the width direction of the sheet 18 supported by the first sheet support surface 32C and the second sheet support surface 32F. Different types of sheets 18 can be supported on the first sheet support surface 32C and the second sheet support surface 32F. In the rear feeding tray 3, the direction parallel to the first sheet supporting surface 32C and the second sheet supporting surface 32F and perpendicular to the feeding direction of the sheet 18 is the left-right direction, and the left-right direction of the sheet 18 is the width. Direction.

  The second sheet support portion 32B has an auxiliary arm 32J extending from the upper end portion of the second sheet support portion 32B in an obliquely upward direction along the second sheet support surface 32F. The auxiliary arm 32J is a support member that supports a portion above the second sheet support surface 32F of the sheet 18 supported by the second sheet support surface 32F. The auxiliary arm 32J is configured to be displaceable between a state extending from the second sheet support portion 32B and a state accommodated in the second sheet support portion 32B.

(Bottom cover)
The lower cover 33 is disposed between the pair of side wall portions 31A so as to face the first sheet support surface 32C. The first sheet support surface 32 </ b> C here is an example of one side surface portion of the first housing 2 of the sheet support surface. The lower cover 33 is supported by the pair of side wall portions 31A at a position separated from the first sheet support surface 32C. The lower cover 33 has a role of preventing foreign matters such as dust from entering the first housing 2 from the feeding port 36 of the rear feeding tray 3.

  The lower cover 33 has a front surface 33A that is the side surface opposite to the first sheet support surface 32C. The front surface 33A is a surface substantially parallel to the first sheet support surface 32C, that is, an inclined surface inclined in a direction in which the lower end portion of the front surface 33A approaches the first housing 2. A pair of first engaging portions 33B is formed in the vicinity of the lower end of the front surface 33A with an interval in the left-right direction. The first engaging portion 33B is a portion that engages with the second engaging portion 34E of the dust-proof cover 34 and supports the dust-proof cover 34 so as to be detachable and rotatable.

  As shown in FIG. 5, the first engaging portion 33 </ b> B is a curved concave portion that opens upward and extends in the left-right direction. The concave portion smoothly connects the front wall portion 33C extending in the vertical direction on the first housing 2 side, the bottom portion 33D extending in the horizontal direction, and the rear wall portion 33E extending in the vertical direction on the first sheet support portion 32A side. Has been configured. The upper end of the rear wall portion 33E is connected to the front surface 33A. That is, the first engaging portion 33B does not penetrate to the first sheet support portion 32A side. In this way, by forming the first engagement portion 33B so as not to penetrate the first sheet support portion 32A side, foreign matters such as dust enter the first housing 2 from the outside through the first engagement portion 33B. And good dustproof performance can be realized.

(Dust cover)
As shown in FIG. 2, the dust cover 34 is a cover member that covers at least a part of the first sheet support surface 32C and the second sheet support surface 32F. Suppresses the entry of foreign objects. The dust cover 34 is provided at the left and right ends of the main cover 34A and the main cover 34A disposed opposite to the second sheet support surface 32F and the front surface 33A of the lower cover 33. A side cover 34B extending toward the 32F side, and an end wall 34C provided at the upper end of the main cover 34A and extending from the main cover 34A toward the second sheet support surface 32F. Yes. The upper end portion of the dust cover 34 and the upper end portion of the second sheet support surface 32F are located at substantially the same height position.

  As described above, the dust cover 34 has the side cover 34B and the end wall 34C, so that foreign matters such as dust enter the first housing 2 from the side and the upper side of the back feeding tray 3. It is possible to suppress this.

  A rectangular notch 34D is formed at the end of the end wall portion 34C on the second sheet support surface 32F side. The notch 34D is formed over the range of the maximum width sheet 18 that can be supported by the second sheet support surface 32F in the left-right direction, and the sheet 18 supported by the second sheet support surface 32F is an end wall portion. It is configured not to contact 34C. Thereby, when the sheet 18 is conveyed, the conveyance load due to the dust cover 6 is not generated.

  As shown in FIGS. 3 and 4, a pair of second engaging portions 34 </ b> E that engage with the first engaging portions 33 </ b> B are formed at the lower end portion of the main cover 34 </ b> A. The second engaging portion 34E is a cylindrical convex portion extending in the left-right direction from the lower end portion of the main cover 34A toward the outside. And since the 1st engaging part 33B is open | released upwards, the 2nd engaging part 34E becomes attachable / detachable to an up-down direction with respect to the 1st engaging part 33B.

  Accordingly, since the dust cover 34 is detachable, the dust cover 34 can be removed when the multifunction machine 1 is transported, and the first sheet support part 32A and the second sheet support part 32B can be folded into the storage position, and the dust cover can be reduced. 34 can be prevented from being damaged. Further, if the multifunction device 1 is used in this state, it can be used in a miniaturized state.

  In addition, the second engaging portion 34E is engaged with the first engaging portion 33B because the second engaging portion 34E is a cylindrical convex portion extending in the left-right direction and is a rotating shaft portion. The second engaging portion 34E can be rotated in the front-rear direction. At this time, a straight line passing through the centers of the left and right circles of the second engagement portion 34E becomes a third rotation axis R3 parallel to the first rotation axis R1.

  The dust cover 34 has a first position (the state shown in FIG. 5) covering the first sheet support surface 32C and the second sheet support surface 32F, the first sheet support surface 32C, and the first sheet support surface 32C around the third rotation axis R3. The two-sheet support surface 32F can be rotated between the second position (the state shown in FIG. 6). The user can replenish the sheet without removing the dust cover 34 by turning the dust cover 34 in the first position to the second position, which is convenient.

  Further, as shown in FIG. 17, the height H1 from the bottom 33D of the front wall 33C in the first engagement portion 33B is higher than the radius RA of the second engagement portion 34E. Thereby, when the dust cover 34 rotates about the third rotation axis R3, the second engagement portion 34E is unlikely to come off from the first engagement portion 33B.

  Thus, the dust-proof cover 34 can be stably supported and rotated by using the fixed first engaging portion 33B as a concave portion and turning the second engaging portion 33A as a convex portion. In the present embodiment, the first engaging portion 33B is a concave portion opened upward, but the opening direction of the concave portion is not particularly limited as long as the dust cover 34 can be attached and detached in a predetermined direction. For example, the first engaging portion 33B can be a recess that is opened in an upward diagonally forward direction, an upwardly diagonally right direction, or an upwardly diagonally left direction.

  In the present embodiment, the first engaging portion 33B is a concave portion and the second engaging portion 34E is a convex portion. Conversely, the first engaging portion 33B may be a convex portion and the second engaging portion 34E may be a concave portion. Good. In the present embodiment, the concave portion has a curved shape extending in the left-right direction and the convex portion has a cylindrical shape extending in the left-right direction. However, the shape of the concave portion and the convex portion is not particularly limited, and the dust-proof cover 34 can be rotated. That's fine. For example, the concave portion can be a hemispherical recess and the convex portion can be a hemispherical shape. Further, for example, the concave portion may be a semicircular groove and the convex portion may be a disk shape. Further, the first engaging portion 33B and the second engaging portion 34E are a combination of a concave portion and a convex portion as long as the dust cover 34 is detachable and rotatable and the first engaging portion 33B does not penetrate therethrough. It may be other than.

  As shown in FIG. 2, the side cover 34 </ b> B has a pair of side guides 35 when the distance between the side covers 34 </ b> B is maximum in the left-right direction, i.e. Further, the sheet is disposed outside the pair of side guides 35 when the sheet 18 having the maximum size in the width direction can be supported.

  Therefore, even when the sheet 18 having the maximum width that can be supported by the rear feeding tray 3 is supported, the first sheet support surface 32C and the second sheet support surface 32F can be covered by the dust cover 34. ing. Accordingly, it is possible to prevent foreign matters such as dust from entering the first housing 2 through the feeding port 36 even when the rear feeding tray 3 supports the sheet 18 of any width size.

  Further, the side cover 34B is disposed inside the left and right end portions of the first sheet support surface 32C and the second sheet support surface 32F in the left-right direction. Thereby, in the left-right direction, there is no gap between the width direction end of the back feeding tray 3 and the side cover 34 </ b> B, and entry of foreign matters such as dust into the first housing 2 is suppressed. It is possible to increase the effect.

  As shown in FIGS. 3 to 6, the side cover 34 </ b> B supports the second sheet when the dustproof cover 34 is positioned at the first position at a position facing the second sheet support surface 32 </ b> F at the upper end on the rear side. It has a positioning portion 34G that comes into contact with the surface 32F. The positioning portion 34G is a convex portion that slightly protrudes rearward. When the dust cover 34 is in the first position, the dust cover 34 is positioned at the first position by the second engagement portion 3 disposed at the lower end portion and the positioning portion 34G disposed at the upper end portion. .

  As described above, the positioning error can be reduced by disposing the positioning portion 34G at the position away from the second engagement portion 34E in the dust cover 34. As a result, the gaps between the dustproof cover 34 and the second sheet support surface 32F and the lower cover 33 are reduced, and the dustproof performance is enhanced.

[Configuration for avoiding damage to the dust cover when the second sheet support is in the closed state]

  FIG. 7 is a partial right side view of the multifunction machine 1 showing a state in which the second housing 4 is in the closed position and the second sheet support portion 32B is between the use position and the storage position. FIG. 8 is a partial right side view of the multifunction machine 1 showing a state in the middle of the second housing 4 being rotated from the state of FIG. 7 toward the open position. FIG. 9 is a partial right side view of the multifunction machine 1 showing a state in which the second housing 4 has reached the open position from the state of FIG.

  In a state in which the dust cover 34 is attached to the multifunction machine 1, there may be a case where the second sheet support part 32 </ b> B in the use position is unintentionally tilted forward by the user. At this time, the dust cover 34 is pushed by the second sheet support portion 32B and falls forward. Then, the multifunction machine 1 is in the state shown in FIG. That is, the second housing 4 is in the closed position, the dust cover 34 is in the second position, the first sheet support portion 32A is in the use position, and the second sheet support portion 32B is between the use position and the storage position. It is in a state. At this time, the main cover 34A of the dust cover 34 and the rear end portion of the second housing 4 come into contact with each other at the third contact portion C3, and the rotating front end portion 32H of the second sheet support portion 32B and the dust cover 34 are brought into contact with each other. Contact is made at the fourth contact portion C4.

  When the second housing 4 is opened from this state, the dust-proof cover 34 is not sandwiched between the second housing 4 and the second sheet support portion 32B and is not crushed, thereby avoiding damage to the dust-proof cover 34. In order to be able to do it, it has the following composition.

  When the second housing 4 starts to open from the state of FIG. 7, that is, when the second housing 4 starts to rotate from the closed position toward the open position, the second housing 4 is contacted by the third contact portion C3. Press the dust cover 34 that comes into contact. As a result, the dust cover 34 starts to rotate from the second position toward the first position, and the dust cover 34 presses the second sheet support portion 32B that comes into contact with the fourth contact portion C4. As a result, a tangential pressing force F1 centering on the third rotation axis R3 is generated from the dust cover 34 to the second sheet support portion 32B at the fourth contact portion C4.

  In this state, when viewed in the direction of the first rotation axis R1, that is, in the direction perpendicular to the paper surface, the pressing force F1 is equal to the tangential component force F2 centered on the second rotation axis R2 and the first rotation axis R2. 2 and a component force F3 in the direction toward the rotation axis R2. Here, the component force F2 is directed in the opposite direction to the third rotation axis R3 side in the tangential direction around the second rotation axis R2. Expressed as an equation, when the clockwise angle in FIG. 7 is a positive angle and the angle formed by F1 and F3 is θ, F2 = F1sin θ> 0. That is, θ> 0.

  Thus, since the component force F2 is a force in the direction in which the second sheet support portion 32B rotates toward the use position, the second sheet support portion 32B rotates toward the use position. Then, as shown in FIG. 9 through the states of FIGS. 7 to 8, the second housing 4 reaches the open position, and the dust cover 34 reaches the use position. In the state between FIG. 7 and FIG. 9 including FIG. 8, the component force F2 is directed in the opposite direction to the third rotation axis R3 side in the tangential direction around the second rotation axis R2, as described above. Yes.

  Therefore, even if the second housing 4 is opened when the second sheet support portion 32B is in the closed state, the dust cover 34 is sandwiched between the second housing 4 and the second sheet support portion 32B and pushed. The dust cover 34 can be prevented from being damaged without being crushed. If the component force F <b> 2 is a force in a direction in which the second sheet support portion 32 </ b> B rotates toward the storage position, the dustproof cover 34 and the second housing 4 are opened when the second housing 4 is opened. Since it is pinched and crushed between the second sheet support portions 32B, the possibility of breakage is high.

  Further, when expressing from another viewpoint that the component force F2 is directed in the direction tangential to the second rotation axis R2 and opposite to the third rotation axis R3, the first rotation axis R1. When viewed in the direction, it can be said that the pressing force F1 is directed to the outside of the triangle T formed by the second rotation axis R2, the third rotation axis R3, and the fourth contact portion C4.

  Here, it is preferable that the shape of the side cover 34B of the dust cover 34 in the fourth contact portion C4 is the cutout portion 34H. For example, as shown in FIG. 8, the notch 34 </ b> H can have a dogleg shape. Thus, by providing the notch 34H, it is possible to satisfy the conditions for avoiding damage to the dust cover 34 while reducing the size of the dust cover 34.

  In order to satisfy the condition for avoiding damage to the dust cover 34, for example, the third rotation axis R3 can be disposed close to the second rotation axis R2. In addition, for example, by providing a convex portion that extends vertically instead of the notch portion 34H, the second sheet support portion 32B has its convex portion in a state in which the second sheet support portion 32B has not rotated much toward the storage position. You may make it contact | abut.

[Configuration to prevent damage to the dust-proof cover when the dust-proof cover is in a position where it has fallen off]
FIG. 10 is a partial side cross-sectional view of the multifunction machine 1 showing a state in which the second housing 4 is in the closed position and the dust cover 34 is in the third position. FIG. 11 is a partial side cross-sectional view of the multifunction machine 1 showing a state in the middle of the second housing 4 being rotated from the state of FIG. 10 toward the open position. FIG. 12 is a partial side cross-sectional view of the multi-function device 1 showing a state where the second housing 4 is rotating from the state of FIG. 11 toward the open position.

  When the user installs the dustproof cover 34 in the wrong position or rotates the dustproof cover 34 in the first position to the second position, the second engagement part 34E is mistakenly removed from the first engagement part 33B. It is conceivable that it will fall. At this time, as shown in FIG. 10, the lower end portion of the dust-proof cover 34 may fall in a groove portion 33 </ b> F that is formed in the lower portion of the lower cover 33 and extends to the left and right. Here, the position of the dust cover 34 shown in FIG. 10 is defined as a third position.

  When the second housing 4 is opened from the state of FIG. 10, the dust-proof cover 34 is not crushed between the second housing 4 and the lower cover 33, and the dust-proof cover 34 is damaged. In order to avoid this, the configuration is as follows.

  When the second housing 4 starts to rotate from the closed position toward the open position from the state of FIG. 10, the rear end portion of the second housing 4 pushes the main cover 34A of the dustproof cover 34, and the state of FIG. Become. That is, the second housing 4 is in a position starting to open from the closed position, and the dust cover 34 is in the third position. At this time, the main cover 34A of the dust-proof cover 34 and the rear end portion of the second housing 4 are in contact with each other at the first contact portion C1, and the extension 34J of the dust-proof cover 34 and the front surface 33A of the lower cover 33 are the first. The two abutting portions C2 are in contact. The extending portion 34J is a portion that extends rearward from the lower end portion of the side cover 34B. The lower surface of the extending portion 34J has a curved shape that is recessed toward the second engaging portion 34E.

  In the state of FIG. 11, when the rear end portion of the second housing 4 presses the main cover 34A of the dust cover 34, a pressing force F4 extending from the first contact portion C1 in the direction passing through the second contact portion C2 is generated. Arise. The direction of the pressing force F4 is higher than the normal line N with respect to the contact surface of the lower cover 33 in the second contact portion C2.

  Thus, the pressing force F4 is a force in a direction in which the extending portion 34J rises along the front surface 33A while pressing the front surface 33A of the lower cover 33, and thus the dustproof cover 34 rises along the front surface 33A. Here, since the front surface 33A of the lower cover 33 is an inclined surface whose lower end portion is inclined in a direction approaching the first housing 2, the resistance at the second abutting portion C2 is reduced. Less lifting resistance. Then, as shown in FIG. 12, the extending portion 34 </ b> J rides on the upper end portion 33 </ b> G of the lower cover 33 that continues from the front surface 33 </ b> A of the lower cover 33.

  Thereafter, when the second housing 4 rotates to the open position, the extending portion 34J moves in the rear lower direction along the upper surface portion 33H extending from the upper end portion 33G of the lower cover 33 in the rear lower direction. And when the 2nd housing | casing 4 arrives at an open position, the extension part 34J will maintain the state engaged with the upper end part 33G of the lower cover 33 using the curved shape of a lower surface. In other words, the dust cover 34 is hooked on the lower cover 33 and is supported at a position close to the first position.

  As described above, even when the second housing 4 is opened when the dust-proof cover 34 falls in the groove portion 33F, the dust-proof cover 34 may be sandwiched between the second housing 4 and the lower cover 33 and crushed. In addition, damage to the dust cover 34 can be avoided. In addition, since the lower surface of the extending portion 34J has a curved shape that is recessed toward the second engaging portion 34E, the extending portion 34J can be engaged with the upper end portion of the first cover. Thereby, since the dust-proof cover 34 is supported at a position close to the first position, the dust-proof cover 34 does not move the next time the second housing 4 is rotated from the closed position toward the open position. Therefore, the resistance when the second housing 4 is opened next time becomes small.

  In addition, when the second housing 4 is rotated from the state of FIG. 12 to the open position, the dust cover 34 moves so that the second engagement portion 34E can be engaged with the first engagement portion 33B. Moving. At this time, if the first engagement portion 33B and the second engagement portion 34E are in the same position in the left-right direction, the second engagement portion 34E engages with the first engagement portion 33B. Thereby, the dust cover 34 moves to the first position, and the dust cover 34 can be used as usual. Thus, when the second housing 4 is opened when the dust-proof cover 34 has fallen into the groove 33F, the dust-proof cover 34 may automatically move to the first position, which is convenient.

  In this embodiment, as shown in FIGS. 10 to 12, the front wall portion 33C of the first engaging portion 33B constituting a part of the front surface 33A extends in the vertical direction, but the front wall portion 33C is also a front surface. It is good also as an inclined surface similar to the other part of 33A. Accordingly, in the state of FIGS. 10 to 12, the second engaging portion 34 </ b> E rises along the inclined surface, so that the resistance to lift the dust-proof cover 34 is reduced.

  In the state of FIG. 11, it is preferable that the lower end of the inclined surface of the front surface 33A including the inclined surface of the front wall portion 33C extends downward from the position of the circle center of the second engaging portion 34E. As a result, when the second housing 4 is opened when the dust-proof cover 34 has fallen into the groove portion 33F, the second engagement portion 34E can be reliably brought into contact with the inclined surface of the front surface 33A. The resistance to lift 34 is reduced.

[Modification 1]
The dust cover 34 of the above embodiment has a notch 34D formed in the end wall 34C. The notch 34D is effective from the viewpoint of reducing the conveyance load of the sheet 18, but is preferably not provided from the viewpoint of dust resistance. If the notch 34D is not provided in the dust-proof cover 34, the dust-proof cover 34 must be opened when the sheet 18 is replenished, in addition to the conveyance load of the sheet 18, which takes time. Therefore, the dustproof cover of the first modification is configured to easily replenish the sheet 18 while improving the dustproof performance.

  FIG. 13 is a front perspective view of a dustproof cover 54 of Modification 1, and FIG. 14 is a side sectional view thereof. In addition, in the modification 1 to the modification 4, the same code | symbol is attached | subjected to the same structure as said embodiment, and the detailed description is abbreviate | omitted.

  The dust cover 54 is provided at the upper end portion of the main cover 34A, and has an end wall portion 54C extending from the main cover 34A toward the second sheet support surface 32F. Unlike the dust cover 34 of the above embodiment, the end wall portion 54C is not formed with a notch 34D. A plate-shaped sheet guiding portion 54A extending in the left-right direction is provided at the left-right center of the rear end portion of the end wall portion 54C. Note that the sheet guiding portion 54A may extend to the left and right end portions of the end wall portion 54C.

  As shown in FIG. 14, the sheet guiding portion 54A has an inclined surface 54B on the back side. The inclined surface 54B faces the second sheet support surface 32F side, and the upper end portion of the inclined surface 54B is at a position farther from the second sheet support surface 32F than the lower end portion. That is, the inclined surface 54B protrudes from the rear end portion of the end wall portion 54C toward the front upper side.

With this configuration, when the user refills the sheet 18, as shown in FIG. 14, when the inclined surface 54B of the sheet guiding portion 54A is pushed at the lower end portion of the sheet 18, a forward force is applied to the sheet guiding portion 54A. In addition, the dustproof cover 54 rotates toward the second position, and a gap is formed between the dustproof cover 54 and the second sheet support surface 32F. Therefore, the user can replenish the sheet support portion 32 as it is along the second sheet support surface 32F. Therefore,
When the sheet 18 is replenished, it is possible to save the trouble of holding the dustproof cover 54 and opening it.

[Modification 2]
Modification 2 is another form of the lower cover. The lower cover has a form for avoiding damage to the dust cover 34 when the dust cover 34 positioned at the first position is pressed. FIG. 15 is a view for explaining the lower cover 63 of the second modification. FIG. 15 shows a cross section at the same position as FIG.

  The difference between the lower cover 63 of Modification 2 and the lower cover 33 of the above embodiment is the shape of the front wall portion 63C of the first engagement portion 63B. The first engaging portion 63B is a curved concave portion that opens upward and extends in the left-right direction. The recess smoothly connects the front wall 63C extending forward and upward on the first housing 2 side, the bottom 33D extending horizontally, and the rear wall 33E extending vertically on the first seat support 32A side. Has been configured.

  The height H2 from the bottom 33D of the front wall 63C is such that when an external force in a direction opposite to the direction toward the second position, that is, an external force in the rear direction is applied to the dust cover 34 positioned at the first position. The height 34 does not interfere with the trajectory TY of the second engaging portion 34E when the contact point TA with the lower cover 63 is rotated about the fulcrum.

  In the present embodiment, the contact TA is located at the upper end 33G of the lower cover 63. Further, the front wall portion 63C has an inclined surface along a locus TY descending from the upper end portion toward the bottom portion 33D. Since the height of the front wall portion 63C can be increased by this inclined surface, the second engagement portion 34E can be made difficult to come off from the first engagement portion 63B during normal use.

  According to such a configuration, when the dust-proof cover 34 positioned at the first position is accidentally pressed against the sheet support portion 32, the dust-proof cover 34 contacts the lower cover 63 at the contact TA. Then, as shown by a two-dot chain line in FIG. 15, the upper part of the dustproof cover 34 rotates backward so as to push the sheet support part 32 with the contact TA as a fulcrum, and the lower part of the dustproof cover 34 is forward with the contact TA as a fulcrum. To turn.

  At this time, since the front wall portion 63C has a height that does not interfere with the locus TY of the second engagement portion 34E, the second engagement portion 34E can move along the locus TY. Thereby, the 2nd engaging part 34E remove | deviates from the 1st engaging part 63B. That is, the dust cover 34 is detached from the lower cover 63. Therefore, damage to the dust cover 34 can be avoided.

[Modification 3]
Modification 3 is another form of dustproof cover. This dust-proof cover has a form that suppresses intrusion of foreign matters such as sand dust from the cutout portion of the side cover. FIG. 16 is a right side view of the dust cover 74 of the third modification. The difference between the dustproof cover 74 of Modification 3 and the dustproof cover 34 of the above embodiment is the shape of the notch 74H of the side cover 74B. When viewed in the direction of the first rotation axis R1 as shown in FIG. 16, the notch 74H is convex toward the second sheet support surface 32F above the position of the fourth contact portion C4 in the state of FIG. It has an inflection point Z. The inflection point Z may be two or more.

  By providing such an inflection point Z, the area cut out by the cutout portion 74H of the modified example 3 becomes smaller than the cutout portion 34H of the above-described embodiment shown by a two-dot chain line in FIG. Therefore, intrusion of foreign matter such as dust from the notch 74H can be suppressed.

[Effect of the embodiment]
The back surface feeding tray 3 of the above-described embodiment is disposed on at least one side surface of the first housing 2 and has sheet support surfaces 32C and 32F that support the sheet 18 supplied into the first housing 2. The unit 32 is provided. Further, the rear feeding tray 3 is arranged to face one side surface portion of the first housing 2 of the sheet support surfaces 32C and 32F, and has a first engagement portion 33B on the side surface opposite to the sheet support surfaces 32C and 32F. A lower cover 33 is provided. Further, the back surface feeding tray 3 includes a second engagement portion that engages with the first engagement portion 33B, and includes a dustproof cover 34 that covers at least a part of the sheet support surfaces 32C and 32F. One of the first engaging portion 33B or the second engaging portion 34E is a convex portion. The other of the first engaging portion 33B or the second engaging portion 34E is a concave portion that engages with the convex portion so as to be detachable and rotatable. The dust cover 34 can be attached to and detached from the lower cover 33 in a predetermined direction, and is rotated between a first position covering the sheet support surfaces 32C and 32F and a second position opening the sheet support surfaces 32C and 32F. It is possible to move.

  According to this configuration, since the dustproof cover 34 is detachable, the dustproof cover 34 can be reduced in size by removing the dustproof cover 34 during transportation of the multifunction device 1, and damage to the dustproof cover 34 can be suppressed. Further, if the dust cover 34 is removed when the multifunction machine 1 is used, it can be used in a miniaturized state. Further, since the dustproof cover 34 is rotatable, the sheet 18 can be replenished without removing the dustproof cover 34, and it is easy to use. Furthermore, since the 1st engaging part 33B is not a through-hole, favorable dustproof performance is realizable.

  According to the back surface feeding tray 3 of the above embodiment, the first engaging portion 33B is opened upward and extends in the width direction parallel to the sheet support surfaces 32C and 32F and perpendicular to the feeding direction of the sheet 18. The second engaging portion 34 </ b> E is a cylindrical convex portion extending in the width direction from the lower end portion of the dustproof cover 34.

  According to this configuration, the dust-proof cover 34 can be stably supported and rotated by using the fixed first engaging portion 33B as a concave portion and the rotating second engaging portion 34E as a convex portion. it can.

  According to the back surface feeding tray 3 of the above-described embodiment, the dust cover 34 is provided on the main cover 34A disposed opposite to the sheet support surfaces 32C and 32F, and on the side of the main cover 34A, and the main cover 34A. And a side cover 34B extending toward the sheet support surface.

  According to this structure, it can suppress that foreign materials, such as dust, penetrate | invade into the 1st housing | casing 2 from the side of the sheet | seat support surfaces 32C and 32F.

  The back surface feeding tray 3 of the above embodiment is provided on the sheet support surfaces 32C and 32F so as to be movable in the width direction, and a pair of the width direction positions of the sheets 18 supported by the sheet support surfaces 32C and 32F are aligned. A side guide 35 is provided. And the side cover 34B is arrange | positioned in the width direction outer side rather than the side guide 35 nearer to the side cover 34B among a pair of side guides 35 in the position where a mutual separation dimension becomes the maximum.

  According to this configuration, the sheet support surfaces 32C and 32F can be covered by the dust cover 34 even when the maximum size sheet 18 that can be supported by the sheet support surfaces 32C and 32F is supported.

  According to the back surface feeding tray 3 of the above-described embodiment, the side cover 34B is disposed on the inner side of the end portions in the width direction of the sheet support surfaces 32C and 32F.

  According to this configuration, there is no gap between the width direction end portions of the sheet support surfaces 32C and 32F and the side cover 34B in the width direction, so that foreign matters such as sand dust enter the first housing 2. The effect which suppresses can be heightened.

  The dust cover 54 of Modification 1 is provided at the upper end of the dust cover 54, faces the sheet support surfaces 32C and 32F, and the upper end is located farther from the sheet support surfaces 32C and 32F than the lower end. A sheet guiding portion 54A having an inclined surface 54B is provided.

  According to this configuration, when the sheet 18 is replenished, the dust cover 34 is opened by pushing the inclined surface 54B of the sheet guiding portion 54A with the lower end portion of the sheet 18. Therefore, the trouble of opening the dust cover 34 when the sheet 18 is replenished can be saved.

  According to the back surface feeding tray 3 of the above-described embodiment, the side cover 34B has a sheet support surface when the dustproof cover 34 is positioned at the first position at a position facing the sheet support surfaces 32C and 32F at the upper end. It has positioning part 34G which contacts 32C and 32F.

  According to this configuration, by positioning the positioning portion 34G at the upper end portion that is away from the second engaging portion 34E that is the rotation shaft portion disposed at the lower end portion of the dust cover 34, positioning errors can be reduced. Can be small.

  According to the lower cover 63 of Modification 2 described above, the first engagement portion 63B has the front wall portion 63C on the first housing 2 side that constitutes a part of the recess. The height H2 of the front wall portion 63C is such that when an external force in a direction opposite to the direction toward the second position is applied to the dustproof cover 34 located at the first position, the dustproof cover 34 has a contact TA with the lower cover 63. The height does not interfere with the locus TY of the second engagement portion 34E when rotating to the fulcrum.

  According to this configuration, when the dust cover 34 is accidentally pressed, the dust cover 34 is detached from the lower cover 63 due to the second engagement portion 34E being detached from the first engagement portion 63B. Can be avoided.

  According to the lower cover 63 of Modification 2 described above, the front wall portion 63C has an inclined surface that descends from the upper end portion of the front wall portion 63C toward the recess.

  According to this configuration, since the height of the front wall portion 63C can be increased by having the inclined surface of the front wall portion 63C, it is difficult for the second engagement portion 34E to be detached from the first engagement portion 63B during normal use. Can do.

  The multifunction device 1 according to the above embodiment includes the first housing 2 that houses the image forming unit 20 that forms an image on the sheet 18, and the back feeding tray 3 described above.

  According to this configuration, the back feeding tray 3 described above can be applied to the multifunction machine 1.

  According to the back surface feeding tray 3 of the above embodiment, the first engagement portion 33B has the front wall portion 33C on the first housing 2 side that constitutes a part of the recess, and the height of the front wall portion 33C is high. The height H1 is higher than the radius RA of the second engagement portion 34E.

  According to this configuration, when the dust cover 34 rotates about the third rotation axis R3, the second engagement portion 34E is unlikely to come off from the first engagement portion 33B.

  The multifunction device 1 according to the above embodiment includes the first housing 2 that houses the image forming unit 20 that forms an image on the sheet 18. The multi-function device 1 is disposed on the upper side of the first housing 2 and has a closed position that covers the upper portion of the first housing 2 and an open portion that opens the upper portion of the first housing 2 around the first rotation axis R1. A second housing 4 is provided that can be rotated between positions. The multi-function device 1 also includes a back feeding tray 3 disposed on the side surfaces of the first housing 2 and the second housing 4 on the first rotation axis R1 side. Further, the back surface feeding tray 3 includes a first sheet support portion 32 </ b> A having a first sheet support surface 32 </ b> C that supports the sheet 18 supplied into the first housing 2. Further, the back surface feeding tray 3 is connected to the upper end portion of the first sheet support portion 32A, and has a second sheet support surface 32F that supports the sheet 18 fed into the first housing 2, and has a first rotation. The second seat support surface 32F cooperates with the first seat support surface 32C around the second rotation axis R2 parallel to the axis R1 and the use position where the seat 18 can be supported and the rotation of the second seat support surface 32F. A second sheet support portion 32 </ b> B is provided that is rotatable between the moving tip portion 32 </ b> H and the storage position closest to the second housing 4. Further, the back surface feeding tray 3 includes a lower cover 33 disposed to face the first sheet support surface 32C. Further, the lower sheet feed tray 3 has a lower end engaged with the first housing 2 side of the lower cover 33, and a first sheet support surface centering on a third rotation axis R3 parallel to the first rotation axis R1. A dust-proof cover 34 that is rotatable between a first position that covers 32C and the second sheet support surface 32F and a second position that opens the first sheet support surface 32C and the second sheet support surface 32F is provided. The dust cover 34 is in the second position, the second sheet support portion 32B is between the use position and the storage position, and the rotating tip 32H of the second sheet support portion 32B is in contact with the dust cover 34. When the second housing 4 is rotated from the closed position toward the open position and the second housing 4 is pressing the dust cover 34, the dust housing is dustproof when viewed in the direction of the first rotation axis R1. A second tangential pressing force F1 about the third rotation axis R3 applied from the dust cover 34 to the second sheet support part 32B at the fourth contact part C4 between the cover 34 and the second sheet support part 32B. A tangential component force F2 centering on the rotation axis R2 is directed in the opposite direction to the third rotation axis R3 side.

  According to this configuration, even if the second housing 4 is opened when the second sheet support portion 32B is in the closed state, the second housing 4 heading to the open position pushes the dust-proof cover 34, and the dust-proof cover. 34 rotates toward the first position, the dust cover 34 presses the second sheet support portion 32B, and the second sheet support portion 32B rotates toward the use position. Therefore, the dust cover 34 is not crushed by being sandwiched between the second housing 4 and the second sheet support portion 32B, and damage to the dust cover 34 can be avoided.

  The configuration of the multifunction device 1 can also be expressed as follows. That is, the multifunction machine 1 includes a first housing 2 that houses an image forming unit 20 that forms an image on a sheet 18. The multifunction device 1 is disposed on the upper side of the first housing 2 and has a closed position that covers the top of the first housing 2 and an open position that opens the top of the first housing 2 around the first rotation axis. The 2nd housing | casing 4 which can be rotated between is provided. The multi-function device 1 also includes a back feeding tray 3 disposed on the side surfaces of the first housing 2 and the second housing 4 on the first rotation axis R1 side. Further, the back surface feeding tray 3 includes a first sheet support portion 32 </ b> A having a first sheet support surface 32 </ b> C that supports the sheet 18 supplied into the first housing 2. Further, the back surface feeding tray 3 is connected to the upper end portion of the first sheet support portion 32A, has a second sheet support surface 32F that supports a sheet supplied into the first housing 2, and has a first rotation axis. The second seat support surface 32F cooperates with the first seat support surface 32C to support the seat 18 and the second seat support surface 32F pivots around the second pivot axis R2 parallel to R1. A second sheet support portion 32 </ b> B is provided that can be rotated between a storage position where the distal end portion 32 </ b> H is closest to the second housing 4. Further, the back surface feeding tray 3 includes a lower cover 33 disposed to face the first sheet support surface 32C. Further, the lower sheet feed tray 3 has a lower end engaged with the first housing 2 side of the lower cover 33, and a first sheet support surface centering on a third rotation axis R3 parallel to the first rotation axis R1. A dust-proof cover 34 that is rotatable between a first position that covers 32C and the second sheet support surface 32F and a second position that opens the first sheet support surface 32C and the second sheet support surface 32F is provided. The dust cover 34 is in the second position, the second sheet support portion 32B is between the use position and the storage position, and the rotating tip 32H of the second sheet support portion 32B is in contact with the dust cover 34. When the second housing 4 is rotated from the closed position toward the open position and the second housing 4 is pressing the dust cover 34, the dust housing is dustproof when viewed in the direction of the first rotation axis R1. A tangential pressing force F1 about the third rotation axis R3 applied from the dust cover 34 to the second sheet support part 32B at the fourth contact part C4 between the cover 34 and the second sheet support part 32B is the second. It faces the outside of the triangle T formed by the rotation axis R2, the third rotation axis R3, and the fourth contact portion C4.

  According to the multifunction device 1 of the above embodiment, the dust cover 34 is in the second position, the second sheet support portion 32B is between the use position and the storage position, and the rotation tip of the second sheet support portion 32B is provided. When the portion 32H is in contact with the dust cover 34, the fourth contact portion C4 of the dust cover 34 with the second sheet support portion 32B is the notch 34H.

  According to this configuration, by forming the fourth contact portion C4 by the notch portion 34H, it is possible to satisfy the conditions for avoiding damage to the dustproof cover 34 while reducing the size of the dustproof cover 34.

  According to the dustproof cover 74 of Modification 3 described above, when viewed in the direction of the first rotation axis R1, the cutout portion 74H is convex above the fourth contact portion C4 toward the second sheet support surface 32F. Has an inflection point Z.

  According to this configuration, the area where the dust cover 74 is notched by the notch 74H can be reduced, and entry of foreign matters such as dust from the notch 74H can be suppressed.

  The multifunction device 1 according to the above embodiment includes the first housing 2 that houses the image forming unit 20 that forms an image on the sheet 18. The multi-function device 1 is disposed on the upper side of the first housing 2 and has a closed position that covers the upper portion of the first housing 2 and an open portion that opens the upper portion of the first housing 2 around the first rotation axis R1. A second housing 4 is provided that can be rotated between positions. The multi-function device 1 also includes a back feeding tray 3 disposed on the side surfaces of the first housing 2 and the second housing 4 on the first rotation axis R1 side. Further, the back surface feeding tray 3 includes a sheet support portion 32 having inclined sheet support surfaces 32 </ b> C and 32 </ b> F that support the sheet 18 supplied into the first housing 2. In addition, the back feeding tray 3 is disposed to face the side portions on the first rotation axis R1 side of the first housing 2 and the second housing 4 of the sheet support surfaces 32C and 32F, and the sheet support surface 32C, A lower cover 33 having a first engagement portion 33B is provided on the side surface opposite to 32F. Further, the rear feeding tray 3 has a second engagement portion 34E that is detachably and rotatably engageable with the first engagement portion 33B, and an extension that extends toward the sheet support surfaces 32C and 32F. And a dustproof cover 34 that covers at least a part of the sheet support surfaces 32C and 32F. The dust cover 34 is detachable in a predetermined direction with respect to the lower cover 33, and rotates between a first position covering the sheet support surfaces 32C and 32F and a second position opening the sheet support surfaces 32C and 32F. Is possible. When the second engagement portion 34E is disengaged from the first engagement portion 33B and the dust cover 34 is in the third position on the lower cover 33, the second housing 4 moves from the closed position toward the open position. When the dust cover 34 is pushed by the second housing 4 by rotating, the second contact between the extension 34J and the lower cover 33 from the first contact portion C1 between the second housing 4 and the dust cover 34 is achieved. The direction of the pressing force F4 extending in the direction passing through the contact portion C2 is higher than the normal line N with respect to the contact surface of the lower cover 33 in the second contact portion C2.

  According to this configuration, even if the second housing 4 is opened with the dust cover 34 falling between the first housing 2 and the lower cover 33, the dust cover 34 is not touched by the lower cover 33. Since the dust-proof cover 34 is lifted along the contact surface, the dust-proof cover 34 is not crushed, and damage to the dust-proof cover 34 can be avoided.

  According to the multifunction device 1 of the above-described embodiment, the lower portion of the extending portion 34J has a curved shape that is recessed toward the second engaging portion 34E.

  According to this configuration, when the dust-proof cover 34 is in the third position, the dust-proof cover 34 is lifted by turning the second housing 4 from the closed position toward the open position, and the curved extending portion 34J. Engages with the upper end portion 33G of the lower cover 33. Thereby, since the dust-proof cover 34 is supported at a position close to the first position, the dust-proof cover 34 does not move the next time the second housing 4 is rotated from the closed position toward the open position. Therefore, the resistance when the second housing 4 is opened next time becomes small.

  According to the multifunction device 1 of the above embodiment, when the second housing 4 is rotated from the closed position to the open position when the dust cover 34 is in the third position, the second engaging portion 34E is the first. It moves to a height at which it can engage with the engaging portion 33B.

  According to this configuration, when the dust cover 34 is in the third position, the dust cover 34 is lifted by rotating the second housing 4 from the closed position toward the open position, and the second engaging portion 34E. Is moved to a height at which the first engaging portion 33B can be engaged with the first engaging portion 33B, the second engaging portion 34E may be engaged with the first engaging portion 33B.

  According to the multifunction device 1 of the above embodiment, the contact surface of the lower cover 33 is an inclined surface whose lower end portion is inclined in a direction approaching the first housing 2.

  According to this configuration, since the contact surface is an inclined surface, the resistance at the second contact portion C2 is reduced, and thus the resistance for lifting the dustproof cover 34 is reduced.

  According to the multi function device 1 of the above embodiment, the first engaging portion 33B is opened upward and is parallel to the sheet support surface 32 and extends in the width direction perpendicular to the feeding direction of the sheet 18. It is. The second engaging portion 34 </ b> E is a cylindrical convex portion extending in the width direction from the lower end portion of the dust cover 34. When the dust cover 34 is in the third position, the lower end portion of the contact surface of the lower cover 33 extends downward from the position of the circle center of the second engagement portion 34E.

  According to this configuration, the second engagement portion 34E can be reliably brought into contact with the contact surface of the lower cover 33 in a state where the dustproof cover 34 is in the third position.

1 MFP (image forming device)
2 First housing (image forming device housing)
3 Rear feed tray (feed tray)
4 Second casing 18 Sheet 20 Image forming unit 32 Sheet support unit 32A First sheet support unit 32B Second sheet support unit 32C First sheet support surface (sheet support surface)
32F Second sheet support surface (sheet support surface)
32H Rotating tip 33 Lower cover (first cover)
33B, 63B 1st engaging part 33C Front wall part (wall part)
34, 74 Dust-proof cover (second cover)
34A Main cover 34B Side cover 34E Second engagement portion 34G Positioning portion 34H Notch portion 34J Extension portion 35 Side guide 54A Seat guide portion C1 First contact portion C2 Second contact portion C4 Contact portion (fourth contact) Contact)
F1 pushing force F2 component force F4 pushing force N normal line R1 first turning axis R2 second turning axis R3 third turning axis T triangle TA contact TY locus Z inflection point

Claims (5)

A first housing that houses an image forming unit that forms an image on a sheet;
Arranged on the upper side of the first casing and pivoting between a closed position covering the upper part of the first casing and an open position opening the upper part of the first casing, with the first rotation axis as the center A possible second housing;
A feeding tray disposed on a side surface on the first rotation axis side of the first housing and the second housing,
The feeding tray is
A sheet support portion having an inclined sheet support surface for supporting a sheet supplied into the first housing;
The seat support surface is disposed to face the side portion on the first rotation axis side of the first housing and the second housing, and has a first engaging portion on the side surface opposite to the seat support surface. A first cover;
A second engagement portion that is detachably and rotatably engageable with the first engagement portion; and an extension portion that extends toward the sheet support surface; A second cover covering at least a portion,
The second cover is detachable from the first cover in a predetermined direction, and is rotatable between a first position covering the sheet support surface and a second position opening the sheet support surface. ,
When the second engagement portion is disengaged from the first engagement portion and the second cover is in a third position on the first cover, the second housing is moved from the closed position to the open position. The extension portion and the first cover from the first contact portion between the second housing and the second cover when the second cover is pushed by the second housing by rotating toward the second housing An image forming apparatus, wherein a direction of a pressing force extending in a direction passing through the second contact portion is higher than a normal to the contact surface of the first cover in the second contact portion.   The image forming apparatus according to claim 1, wherein a lower portion of the extending portion has a curved shape that is recessed toward the second engaging portion.   When the second cover is in the third position and the second housing is rotated from the closed position to the open position, the second engagement portion can be engaged with the first engagement portion. The image forming apparatus according to claim 1, wherein the image forming apparatus moves to a certain height.   The image according to claim 1, wherein the contact surface of the first cover is an inclined surface whose lower end portion is inclined in a direction approaching the first housing. Forming equipment. The first engagement portion is a concave portion having a curved shape that is open upward, extends in the width direction parallel to the sheet support surface and perpendicular to the sheet feeding direction,
The second engaging portion is a columnar convex portion extending in the width direction from a lower end portion of the second cover,
The lower end portion of the contact surface of the first cover extends downward from the position of the circle center of the second engagement portion in a state where the second cover is in the third position. Item 5. The image forming apparatus according to Item 4.

Images