Image forming apparatus

Abstract

An image forming apparatus includes: a transport unit that transports a recording medium in a predetermined transport direction; and a frame that detachably supports the transport unit, the frame including: a pair of side plates disposed facing each other in a direction intersecting the transport direction; the two reference shafts are fixed at the same height at intervals in the conveying direction between the pair of side plates; the conveying unit is provided with two adjusting shafts which are separated at the same interval as the interval between the two reference shafts and are fixed at the same height, one end of each adjusting shaft is arranged below the other end of the corresponding reference shaft at a certain interval in the vertical direction, and the other end of each adjusting shaft is arranged below the other end of the corresponding reference shaft at a certain interval in the vertical direction. One end of one adjustment shaft is supported by one side plate at a distance from one end of the reference shaft and is supported by the other side plate, the other end of the one adjustment shaft is supported by one support plate at a position below the one end of the reference shaft in the vertical direction, and the other end of the other adjustment shaft is supported by the other support plate so as to be movable in the vertical direction.

Description

Technical Field

[0001] The present invention relates to an image forming apparatus including a conveying unit. Background Art

[0002] The inkjet image forming apparatus of the related art includes a conveying unit for conveying a recording medium in a predetermined conveying direction, and an inkjet head for ejecting ink onto the conveyed recording medium. In order to obtain good image quality, it is necessary to keep the distance between the recording medium conveyed by the conveying unit and the inkjet surface of the inkjet head constant. Since the conveying unit has a predetermined length in the conveying direction, if the distance between the upstream side and the downstream side in the conveying direction is different, color shift will occur.

[0003] In the image forming apparatus of the related art, the conveyor belt unit (corresponding to the conveyor unit) is supported by the side plate of the frame at four points along the horizontal plane. Three of the four points are directly fixed to the side plate, and the remaining one point is supported by the side plate in a manner that can be adjusted in the height direction. After obtaining flatness by fixing the three points, the remaining one point is adjusted, thereby supporting the conveyor belt unit on the frame without distortion or deformation.

[0004] In the image forming apparatus of the related art, the conveyor belt unit is supported on the frame through the opening of the upper surface of the frame. Therefore, it is relatively easy to support three points along the horizontal plane. However, there is also a case where the conveyor belt unit passes through the opening of the front surface of the frame and is supported on the frame. In this case, it cannot be handled. Summary of the invention

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an image forming apparatus capable of supporting a conveying unit without distortion or deformation relative to a frame even when the conveying unit passes through an opening in a front surface of the frame and is supported by the frame.

[0006] To solve the above-mentioned problem, an image forming apparatus of the present invention includes: a conveying unit for conveying a recording medium in a predetermined conveying direction; and a frame body for detachably supporting the conveying unit, wherein the image forming apparatus is characterized in that the frame body includes: a pair of side plates arranged opposite to each other in a direction intersecting the conveying direction; two reference shafts fixed at the same height at intervals between the pair of side plates in the conveying direction; and two support plates hung from one end of the two reference shafts and fixed to one of the side plates, wherein the conveying unit includes two adjustment shafts, the two adjustment shafts are fixed at the same height at intervals equal to the interval between the two reference shafts, one end of the two adjustment shafts is supported by the other side plate below the vertical direction at a certain interval from the other end of the two reference shafts, the other end of the one adjustment shaft is supported by the one support plate below the vertical direction at the certain interval from the one end of the reference shaft, and the other end of the other adjustment shaft is supported by the other support plate so as to be movable in the up-down direction.

[0007] In the present invention, one of the side plates has an opening for allowing the transport unit to enter and exit in the front-rear direction, and the two support plates overlap a portion of the opening.

[0008] In the present invention, the support plate on the other side includes: an adjustment member supported so as to be rotatable in the upward and downward directions; and a screw for rotating the adjustment member relative to the support plate, and the other end of the adjustment shaft on the other side is supported by the adjustment member, and the adjustment member is rotated by rotating the screw, thereby enabling the other end of the adjustment shaft on the other side to move in the upward and downward directions.

[0009] According to the present invention, even when the conveying unit is inserted into and removed from the frame in the front-rear direction, the conveying unit can be horizontally supported at three points by providing left and right support plates overlapping with a part of the opening. Therefore, the conveying unit can be supported on the frame without distortion or deformation, thereby preventing color shift.

[0010] This specification introduces the concepts described in the following detailed description in a simplified manner, with appropriate reference to the drawings. This specification is not intended to limit the important features and essential features of the subject matter described in the claims, nor is it intended to limit the scope of the subject matter described in the claims. In addition, the objects described in the claims are not limited to implementations that solve some or all of the disadvantages described in any part of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a front view schematically showing the internal structure of the image forming apparatus according to one embodiment of the present invention.

[0012] Figure 2A This is a perspective view of a housing of an image forming apparatus according to an embodiment of the present invention as viewed from the front.

[0013] Figure 2B This is a perspective view of a housing of an image forming apparatus according to an embodiment of the present invention as viewed from the rear.

[0014] Figure 3 It is a perspective view showing a transport unit of the image forming apparatus according to one embodiment of the present invention.

[0015] Figure 4 This is a perspective view of a housing supporting a conveying unit in an image forming apparatus according to an embodiment of the present invention, as viewed from the front.

[0016] Figure 5 This is a perspective view of a housing supporting a conveying unit in an image forming apparatus according to an embodiment of the present invention, as viewed from the rear side.

[0017] Fig. 6A This is a front view showing the positional relationship between a reference axis and an adjustment axis in the image forming apparatus according to one embodiment of the present invention.

[0018] Figure 6B It is a rear view showing the positional relationship between a reference axis and an adjustment axis in the image forming apparatus according to one embodiment of the present invention.

[0019] Fig. 7A It is a perspective view showing an adjustment member in the image forming apparatus according to one embodiment of the present invention.

[0020] Figure 7B It is a cross-sectional perspective view showing an adjustment member in the image forming apparatus according to one embodiment of the present invention. DETAILED DESCRIPTION

[0021] Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

[0022] Initially, refer to Figure 1 , the overall structure of the image forming apparatus 1 will be described. Figure 1 1 is a front view schematically showing the interior of the image forming apparatus 1. In each figure, L, R, Fr, and Rr represent left, right, front, and rear, respectively.

[0023] The image forming apparatus 1 is an inkjet image forming apparatus that forms an image by ejecting ink. The image forming apparatus 1 includes a housing 3 having a rectangular parallelepiped hollow portion.

[0024] First, refer to Figure 2A and Figure 2B Frame 3 is described. Figure 2A and Figure 2B3 is a perspective view showing the frame 3. The frame 3 includes: four pillars 5 respectively arranged at the four corners (left front corner, right front corner, left rear corner, and right rear corner) of the hollow part; a rectangular upper frame 7 connecting the upper ends of the four pillars 5; and a rectangular lower frame 9 connecting the lower ends of the four pillars 5. The hollow part is divided into an upper hollow part S1 and a lower hollow part S2 (see also FIG. 1 ) by a partition 11 along a horizontal plane. Figure 1 ).

[0025] A front side plate 13 is fixed to the front surface of the upper hollow portion S1. Specifically, the front side plate 13 is fixed to the upper frame 7 and the two pillars 5 on the front side. An opening 15 is formed in the front side plate 13. A rear side plate 17 is fixed to the rear surface of the upper hollow portion S1. Specifically, the rear side plate 17 is fixed to the upper frame 7, the two pillars 5 on the rear side, and the partition 11. In this way, the front side plate 13 and the rear side plate 17 are opposite to each other in the front-to-back direction. In addition, the frame 3 has a bottom plate, a right side plate fixed between the pillars 5 on the right side, and a left side plate fixed between the pillars 5 on the left side. The above-mentioned detailed description is omitted.

[0026] The left and right ends of the front side plate 13 are formed with left and right upper through holes 19L and 19R at the same height. The left and right ends of the rear side plate 17 are formed with left and right upper through holes 21L and 21R at the same height as the left and right upper through holes 19L and 19R of the front side plate 13. The left upper through hole 19L and the left upper through hole 21L are arranged on the same axis along the front-back direction. The right upper through hole 19R and the right upper through hole 21R are arranged on the same axis along the front-back direction.

[0027] In addition, if Figure 2B As shown, at the left and right ends of the rear side plate 17, left and right lower through holes 23L, 23R are formed at equal intervals in the vertical direction below the left and right upper through holes 21L, 21R.

[0028] A left reference shaft 25L is provided between the upper through hole 19L on the left side and the upper through hole 21L on the left side. A right reference shaft 25R is provided between the upper through hole 19R on the right side and the upper through hole 21R on the right side. The left and right reference shafts 25L, 25R (collectively referred to as reference shafts 25) are shafts with stepped ends having smaller diameters. That is, the front end and rear end of the left reference shaft 25L are inserted into the upper through hole 19L on the left side and the upper through hole 21L on the left side, and the front end and rear end of the right reference shaft 25R are inserted into the upper through hole 19R on the right side and the upper through hole 21R on the right side. In this way, the left and right reference shafts 25L, 25R are fixed at the same height in a posture perpendicular to the front and rear side plates 13, 17 and parallel to each other.

[0029] Refer again Figure 1The head unit 31 and the conveying unit 33 are accommodated in the upper hollow portion S1 of the frame 3. The head unit 31 is accommodated in the upper portion of the upper hollow portion S1, and the conveying unit 33 is accommodated in the lower portion of the upper hollow portion S1. For example, the ink container and the cleaning liquid container 35 are accommodated in the lower hollow portion S2 of the frame 3.

[0030] The head unit 31 is described. The head unit 31 includes four inkjet heads 41 corresponding to yellow, black, cyan, and magenta inks. The inkjet head 41 includes three recording heads (not shown). The four inkjet heads 41 are arranged at predetermined intervals in the left-right direction.

[0031] The recording head has a plurality of nozzles (not shown) for supplying ink, and a piezoelectric element (not shown) provided for each nozzle. The discharge ports of the plurality of nozzles are open on the lower surface of the recording head. By driving the piezoelectric element, the ink in the nozzle is discharged downward from the discharge port.

[0032] Next, refer to Figure 1 and Figure 3 The transport unit 33 will be described. Figure 3 3 is a perspective view showing the conveying unit 33. The conveying unit 33 includes an endless conveying belt 51, a driving roller 53A and a driven roller 53B around which the conveying belt 51 is wound. The conveying belt 51 is formed with a plurality of through holes penetrating in the thickness direction. The driving roller 53A and the driven roller 53B are connected by front and rear side plates 55 (see FIG. Figure 3 ,exist Figure 1 The front side plate 55 is formed with a handle 55a. The conveyor belt 51 is rotated by the rotation of the driving roller 53A. Figure 1 and Figure 3 Utilize the conveyor belt 51 that travels along the upper travel track, along Figure 1 and Figure 3 The recording medium is transported in a right-to-left transport direction.

[0033] like Figure 1 As shown, a conveyor plate 57, a plurality of suction chambers 59 and a plurality of suction devices 61 are arranged in the hollow portion of the conveyor belt 51. The conveyor plate 57 is arranged between the two rollers 53A and 53B, and contacts the inner surface of the conveyor belt 51 running along the upper travel track. The conveyor plate 57 is provided with a plurality of through holes penetrating in the thickness direction. A plurality of suction chambers 59 are arranged below the conveyor plate 57 along the conveying direction. The suction device 61 is arranged in the suction chamber 59 so that a negative pressure is generated in the suction chamber 59. When the suction chamber 59 becomes negative pressure, a negative pressure is generated in the through hole of the conveyor plate 57 and the through hole of the conveyor belt 51 running along the upper travel track, and the recording medium is adsorbed on the conveyor belt 51.

[0034] like Figure 3As shown, the left and right adjustment shafts 63L and 63R (collectively referred to as the adjustment shaft 63) respectively penetrate between the left end and the right end of the front and rear side plates 55. The left and right adjustment shafts 63L and 63R are fixed at the same height in a posture perpendicular to the front and rear side plates 55 and parallel to each other. The adjustment shaft 63 is a shaft with a stepped shape having a smaller diameter at both ends.

[0035] The conveying unit 33 passes through the opening 15 of the front side plate 13 of the frame 3 (see Figure 2A , Figure 2B ), is housed in the lower portion of the upper hollow portion S1 of the frame 3 (below the head unit 31), and is supported by the front side plate 13 and the rear side plate 17 of the frame 3 via left and right adjustment shafts 63L and 63R so as to be detachable.

[0036] Next, refer to Figure 4 , Figure 5 , Fig. 6A and Figure 6B , describing the transport unit 33 supported by the frame 3. Figure 4 This is a perspective view of the frame 3 supporting the conveying unit 33 as viewed from the front side. Figure 5 This is a perspective view of the frame 3 supporting the transport unit 33 as viewed from the rear side. Fig. 6A and Figure 6B It is a diagram for explaining the positional relationship between the reference shaft 25 and the adjustment shaft 63 .

[0037] like Figure 5 As shown, the rear end portions of the left and right adjustment shafts 63L and 63R are inserted into the left and right lower through holes 23L and 23R formed in the rear side plate 17 of the frame body 3. Figure 4 As shown, the front end portions of the left and right adjustment shafts 63L and 63R are supported by the front plate 13 of the frame body 3 via left and right support plates 71L and 71R (collectively referred to as support plates 71 ), respectively.

[0038] The left and right support plates 71L and 71R are described. Figure 4 and Fig. 6A The right support plate 71R is described. The right support plate 71R is substantially rectangular and has upper and lower through holes 81R and 83R. The diameter of the upper through hole 81R is the same as the diameter of the front end of the right reference shaft 25R of the frame 3, and the diameter of the lower through hole 83R is the same as the diameter of the front end of the right adjustment shaft 63R of the conveying unit 33. Fig. 6A As shown, the interval D between the upper and lower through holes 81R and 83R is equal to the interval D between the upper and lower through holes 21R and 23R formed on the right side of the rear side plate 17 of the frame body 3 (see Figure 6B )equal.

[0039] like Figure 4 and Fig. 6AAs shown, the right support plate 71R is suspended from the front end portion of the right reference shaft 25R protruding from the upper through hole 19R of the front side plate 13 of the frame 3. That is, by inserting the front end portion of the right reference shaft 25R into the upper through hole 81R of the right support plate 71R, the right support plate 71R is suspended from the front end portion of the right reference shaft 25R. Moreover, the front end portion of the right adjustment shaft 63R of the conveying unit 33 is inserted into the lower through hole 83R of the right support plate 71R. In this way, by utilizing the dead weight of the conveying unit 33, the front end portion of the right adjustment shaft 63R and the front end portion of the right reference shaft 25R are arranged in the vertical direction. In this way, with the right support plate 71R suspended from the front end portion of the right reference shaft 25R, the right support plate 71R is fixedly connected to the front side plate 13 of the frame 3 and the support pillar 5. At this time, as shown Fig. 6A As shown, the right support plate 71R overlaps a part (right end portion) of the opening 15 of the front side plate 13 .

[0040] In this way, by aligning the front end of the right adjustment shaft 63R and the front end of the right reference shaft 25R in the vertical direction, the front end and the rear end of the right adjustment shaft 63R are positioned at the same height (the height below the upper through hole 19R of the front side plate 13 and the upper through hole 21R of the rear side plate 17 in the vertical direction at a distance D). In addition, as described above, the rear end of the left adjustment shaft 63L is inserted into the lower through hole 23L formed on the left side of the rear side plate 17 of the frame body 3. The lower through hole 23L is formed at a height below the upper through hole 21L in the vertical direction at a distance D. Therefore, the rear end of the left adjustment shaft 63L is also positioned at the same height as the front end and the rear end of the right adjustment shaft 63R.

[0041] Next, refer to Figure 4 and Fig. 6A The left support plate 71L is described. The left support plate 71L is roughly rectangular and has upper and lower through holes 81L and 83L. The diameter of the upper through hole 81L is the same as the diameter of the front end of the left reference shaft 25L of the frame 3, and the diameter of the lower through hole 83L is larger than the diameter of the washer 105 (described later) installed at the front end of the left adjustment shaft 63L of the conveying unit 33. Fig. 6A As shown, the interval D between the upper and lower through holes 81L and 83L is the same as that between the upper and lower through holes 21L and 23L formed on the left side of the rear side plate 17 of the frame body 3 (see Figure 6B ) are equal in interval D.

[0042] Furthermore, a pin 85 extending forward is formed on the left side of the lower through hole 83L in the left support plate 71L.

[0043] The left support plate 71L is suspended from the front end of the left reference shaft 25L protruding from the upper through hole 19L of the front side plate 13 of the frame body 3. That is, the left support plate 71L is suspended from the front end of the left reference shaft 25L by inserting the front end of the left reference shaft 25L into the upper through hole 81L of the left support plate 71L. Furthermore, the front end of the left adjustment shaft 63L of the conveying unit 33 is inserted into the lower through hole 83L of the left support plate 71L. The front end of the left adjustment shaft 63L protrudes from the lower through hole 83L and is supported by the left support plate 71L via the adjustment member 101.

[0044] Next, refer to Fig. 7A and Figure 7B The adjustment member 101 will be described. Fig. 7A is a perspective view showing the adjustment member 101, Figure 7B 1 is a cross-sectional perspective view showing the adjustment member 101. The adjustment member 101 is a rectangular parallelepiped member having a substantially rectangular front surface and rear surface, upper and lower side surfaces, and left and right side surfaces.

[0045] On the front and rear surfaces, a front through hole 103 and a rear through hole 104, both of which are long holes extending in the horizontal direction and have different diameters, are formed in a stepped shape in the axial direction on the same axis along the front-to-back direction. The front end of the left adjustment shaft 63L protruding from the lower through hole 83L of the left support plate 71L is inserted into the front through hole 103 and the rear through hole 104. Specifically, as shown in FIG. Figure 7B As shown, the front end of the left adjustment shaft 63L protruding from the lower through hole 83L of the left support plate 71L is coaxially embedded with a cylindrical washer 105 having a larger diameter than the front end. The washer 105 is inserted into the rear through hole 104. Fig. 7A As shown, the front end portion of the left adjustment shaft 63L protrudes from the washer 105 and passes through the front through hole 103 to protrude forward.

[0046] On the left side of the front and rear through holes 103 and 104 of the adjustment member 101, a fulcrum through hole 106 penetrating the front and rear surfaces is rotatably supported by a pin 85 formed on the left support plate 71L (see also Figure 4 , Fig. 6A ). In addition, a screw hole 107 penetrating the upper surface and the lower surface is opened on the right side of the front and rear through holes 103 and 104. A screw 111 is screwed into the screw hole 107 from above. The lower end of the screw 111 protrudes downward from the lower side plate.

[0047] A substantially horizontal fixing piece 113 is fixed to the left support plate 71L below the adjustment member 101. The lower end of the screw 111 threadedly connected to the screw hole 107 of the adjustment member 101 abuts against the fixing piece 113. When the screw 111 is rotated in the screwing direction, the adjustment member 101 rises relative to the fixing piece 113 and rotates upward around the pin 85. On the other hand, when the screw 111 is rotated in the loosening direction, the adjustment member 101 falls relative to the fixing piece 113 and rotates downward around the pin 85.

[0048] By rotating the adjustment member 101 in this way, the front end portion of the left adjustment shaft 63L moves in the vertical direction in the lower through hole 83L of the left support plate 71L together with the washer 105 engaged with the rear through hole 104 of the adjustment member 101 .

[0049] Furthermore, a cover plate 115 that covers a portion of the front surface, the left side surface, and the lower side surface of the adjustment member 101 is fixed to the left support plate 71L.

[0050] As described above, the left support plate 71L is suspended from the front end of the left reference shaft 25L protruding from the upper through hole 19L of the front side plate 13 of the frame body 3. In this way, the front end of the left adjustment shaft 63L and the front end of the left reference shaft 25L are arranged in the vertical direction by the dead weight of the conveying unit 33. In this way, the left support plate 71L is fixedly connected to the front side plate 13 of the frame body 3 and the support column 5 in a state where the left support plate 71L is suspended from the front end of the left reference shaft 25L. At this time, the left support plate 71L overlaps with a part (left end) of the opening 15 of the front side plate 13 of the frame body 3.

[0051] The following describes a method for adjusting the horizontality of the conveying unit 33 in the image forming apparatus 1 having the above configuration. As described above, the front end and rear end of the right adjustment shaft 63R and the rear end of the left adjustment shaft 63L of the conveying unit 33 are located at the same height. Therefore, the conveying unit is fixed to the frame 3 by making the three points (the front end and rear end of the right adjustment shaft 63R and the rear end of the left adjustment shaft 63L) on the same horizontal plane.

[0052] On the other hand, the front end of the left adjustment shaft 63L is inserted into the lower through hole 83L of the left support plate 71L. Since the diameter of the lower through hole 83L is larger than the diameter of the washer 105 installed at the front end of the left adjustment shaft 63L, the front end of the left adjustment shaft 63L can move in the up-down direction and can move to the horizontal plane defined by the above-mentioned three points. Therefore, by rotating the screw 111 of the adjustment member 101 in a certain direction, the front end of the left adjustment shaft 63L moves in the up-down direction, and the conveying unit 33 can be horizontally supported without twisting and bending at four points (the front end and rear end of the right adjustment shaft 63R and the front end and rear end of the left adjustment shaft 63L).

[0053] Thus, the front side plate 13 and the rear side plate 17 of the frame 3 are examples of the side plate on one side and the side plate on the other side in the present invention, and the front end and the rear end of the reference shaft 25 are examples of one end and the other end of the reference shaft in the present invention. In addition, the front end and the rear end of the adjustment shaft 63 are examples of the other end and one end of the adjustment shaft in the present invention. In addition, the left support plate 71L and the right support plate 71R are examples of the support plate on the other side and the support plate on one side in the present invention.

[0054] As described above, according to the present invention, even when the conveying unit 33 is inserted into and removed from the opening 15 of the front side plate 13 of the frame 3, the conveying unit 33 can be horizontally supported at three points by providing the left and right support plates 71L and 71R overlapping with a part of the opening 15. Therefore, the conveying unit 33 can be supported on the frame 3 without distortion or deformation, so that color shift does not occur.

[0055] Next, an example of a method for mounting the transport unit 33 on the frame 3 is described. First, the transport unit 33 is inserted into the upper hollow portion S1 through the opening 15 of the front plate 13 of the frame 3. Then, the rear ends of the left and right adjustment shafts 63L and 63R of the transport unit 33 are respectively inserted into the left and right through holes 23L and 23R of the rear plate 17 of the frame 3.

[0056] Next, the front ends of the left and right adjustment shafts 63L and 63R are inserted into the lower through holes 83L and 83R of the left and right support plates 71L and 71R. Here, the front end of the adjustment shaft 63L is preliminarily mounted with a washer 105. In addition, the adjustment member 101 and the cover plate 115 are mounted on the support plate 71L.

[0057] Then, the front ends of the left and right reference shafts 25L and 25R protruding from the front side plate 13 of the frame 3 are inserted into the upper through holes 81L and 81R of the left and right support plates 71L and 71R. In this way, the left and right support plates 71L and 71R are hung from the left and right reference shafts 25L and 25R. Then, by using the dead weight of the conveying unit 33, the upper and lower through holes 81L and 83L of the left support plate 71L are arranged in the vertical direction, and the upper and lower through holes 81R and 83R of the right support plate 71R are arranged in the vertical direction. Then, the left and right support plates 71L and 71R are fixedly connected to the frame 3. In this way, the conveying unit 33 is fixed on the same horizontal plane at three points (the front end and rear end of the right adjustment shaft 63R and the rear end of the left adjustment shaft 63L).

[0058] Finally, the position of the front end portion of the left adjustment shaft 63L is adjusted by rotating the screw 111 of the adjustment member 101 in a predetermined direction, so that the conveying unit 33 is positioned horizontally.

[0059] In addition, according to the above-mentioned embodiment, the front end portion of the left adjustment shaft 63L of the conveying unit 33 is supported to be adjustable by the adjustment member 101. That is, since the right adjustment shaft 63R is fixed to the frame 3, the end portion (right end portion) on the upstream side in the conveying direction of the conveying unit 33 is fixed to the frame 3. Usually, the recording medium is conveyed to the conveying unit 33 from the paper supply device adjacent to the image forming device. Therefore, by fixing the end portion on the upstream side in the conveying direction of the conveying unit 33 to the frame 3, the receiving port of the recording medium from the paper supply device can be positioned with high precision relative to the paper supply device.

[0060] However, the front end portion of the right adjustment shaft 63R of the transport unit 33 or the rear end portions of the left and right adjustment shafts 63L, 63R may be supported by the adjustment member 101 so as to be adjustably supported.

[0061] The above-described embodiment shows one form of the image forming apparatus of the present invention, and the technical scope of the present invention is not limited to the above-described embodiment.

[0062] The scope of the present invention is not limited to the above content, but is defined by the description of the claims, so it can be considered that the embodiments described in this specification are only illustrative, not limiting. Therefore, all changes that do not depart from the scope and limits of the claims, as well as contents that are equivalent to the scope and limits of the claims, are included in the scope of the claims.

Claims

1. An image forming device, comprising: a conveying unit for conveying the recording medium in a predetermined conveying direction; and a frame body that detachably supports the transport unit, wherein the image forming apparatus is characterized in that: The frame comprises: a pair of side plates arranged opposite to each other in a direction intersecting the conveying direction; Two reference shafts are fixed at the same height between the pair of side plates and spaced apart in the conveying direction; and Two support plates are hung on one end of the two reference shafts and fixed to one of the side plates, The conveying unit includes two adjustment shafts, and the two adjustment shafts are separated by the same interval as the interval between the two reference shafts and fixed at the same height. One end of the two adjustment shafts is supported by the other side plate at a predetermined interval below the other end of the two reference shafts in the vertical direction. The other end of the adjustment shaft on one side is supported by the support plate on one side at a position below the one end of the reference shaft in the vertical direction and at a predetermined distance therefrom. The other end portion of the other adjustment shaft is supported by the other support plate so as to be movable in the up-down direction.

2. The image forming apparatus according to claim 1, wherein: The side plate on one side has an opening for allowing the conveying unit to enter and exit in the front-rear direction. The two support plates overlap a portion of the opening.

3. The image forming apparatus according to claim 1, wherein: The support plate of the other side comprises: An adjustment member supported to be rotatable in an upward and downward direction; and a screw for rotating the adjustment member relative to the support plate, The other end of the other adjustment shaft is supported by the adjustment member, and the other end of the other adjustment shaft can be moved in the vertical direction by rotating the screw to rotate the adjustment member.

Images