JP2020003757A - Image formation apparatus - Google Patents

Abstract

To provide an image formation apparatus which can reduce twisting of a door unit at the time when the door unit is opened.SOLUTION: An image formation apparatus includes: an apparatus body having an image formation part for forming an image on a sheet; a door unit which is openably/closably supported with respect to the apparatus body around the axis extending in the vertical direction, and has a sheet loading part loaded with sheets and a sheet feeding part feeding the sheets loaded on the sheet loading part to the image formation part; and a regulation part which is brought into contact with the contact region of the door unit in such a state that the door unit is opened with respect to the apparatus body and regulates the opening angle of the door unit. The gravity center of the door unit is located at the position overlapping with the contact region in the vertical direction. The center in the vertical direction and the gravity center of the contact region is located on one side with respect to the center in the vertical direction of the door unit.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an image forming apparatus that forms an image on a sheet.

  2. Description of the Related Art Conventionally, there has been proposed an image forming apparatus provided with a front door that is opened at the front of an apparatus main body having an image forming unit for forming an image on a sheet during maintenance or a work for removing a jammed sheet (Patent Document 1). reference). This image forming apparatus is provided with a stopper member for locking the lower end of the apparatus main body and the lower end of the front door to the front door, and the front door is opened when the front door is opened at a predetermined angle with respect to the apparatus main body. The door is configured to be locked. Further, in general, a door unit provided on a side surface of the apparatus main body and having a manual feeding portion for feeding a manually fed sheet is known.

JP 2004-122370A

  Since the door unit has a manual feeding portion, the center of gravity is often located slightly below the center of the door unit in the vertical direction. In such a door unit, when the lower end of the door unit is locked by the stopper member described in Patent Document 1, the center of gravity of the door unit and the stopper member are vertically displaced. When such a door unit is vigorously opened, the door unit is locked by the stopper member at a predetermined opening angle. However, the door unit is twisted to open further due to inertia, and the door unit is easily distorted or deformed.

  Therefore, an object of the present invention is to provide an image forming apparatus capable of reducing the twist of the door unit when the door unit is opened.

  The present invention provides, in an image forming apparatus, an apparatus main body having an image forming unit for forming an image on a sheet, and a door unit supported to be openable and closable with respect to the apparatus main body around an axis extending vertically. A door unit having a sheet stacking unit on which sheets are stacked, and a sheet feeding unit for feeding the sheets stacked on the sheet stacking unit to the image forming unit; A restricting portion that contacts the contact area of the door unit in an open state, and regulates an opening angle of the door unit, wherein the center of gravity of the door unit is located at a position overlapping the contact area in the vertical direction. The center of the contact area in the vertical direction and the center of gravity are located on one side with respect to the center of the door unit in the vertical direction.

  According to another aspect of the present invention, there is provided an image forming apparatus comprising: an apparatus main body having an image forming unit for forming an image on a sheet; A door unit having a sheet stacking unit on which sheets are stacked, and a feeding roller for feeding the sheets stacked on the sheet stacking unit to the image forming unit; and A restricting portion that contacts the contact area of the door unit in the open state, and regulates an opening angle of the door unit, wherein the feeding roller is located at a position overlapping the contact area in the vertical direction. The center of the contact area in the vertical direction and the feed roller are located on one side with respect to the center of the door unit in the vertical direction.

  According to the present invention, the center of the contact area in the vertical direction and the center of gravity of the door unit are located on one side with respect to the center in the vertical direction of the door unit. Can be reduced.

1 is an overall schematic diagram illustrating an image forming apparatus according to a first embodiment. FIG. 2 is a perspective view of the image forming apparatus in a state where a right door is open. FIG. 3A is a front view illustrating the image forming apparatus, in which FIG. 4A is a front view in a state where a right door is closed, and FIG. 4B is a front view in a state where the right door is open. 2A is a perspective view illustrating the image forming apparatus, FIG. 2A is a perspective view illustrating a state in which a right door is closed, and FIG. 2B is a perspective view illustrating a state in which the right door is opened. The left side view of a right door. FIG. 4A is a right side view showing the image forming apparatus, in which FIG. 4A is a right side view in a state where a right door is closed, and FIG. 4B is a right side view in a state where the right door is open. 7A is a graph showing a time change of the displacement of the manual feed door in the rotation direction, FIG. 7A is a graph showing a time change in the comparative example, and FIG. 7B is a graph showing a time change in the first embodiment. FIG. 9 is a perspective view of an image forming apparatus according to a second embodiment.

<First embodiment>
[overall structure]
First, a first embodiment of the present invention will be described. As shown in FIG. 1, a printer 100 as an image forming apparatus according to the first embodiment is an electrophotographic laser beam printer that forms four color toner images. As shown in FIG. 1, the printer 100 includes a reader unit 43 that reads an image of a document, and an apparatus main body 90 provided below the reader unit 43. The apparatus main body 90 includes the cassette feeding unit 60, the image forming unit 1, the fixing device 5, and the door unit 2.

  When an image forming command is output to the printer 100, an image forming process by the image forming unit 1 is started based on image information input from the reader unit 43 or an external computer connected to the printer 100. The image forming unit 1 includes scanner units 13Y, 13M, 13C, and 13K, and four process cartridges 1Y, which form images of four colors of yellow (Y), magenta (M), cyan (C), and black (K). 1M, 1C, and 1K. The four process cartridges 1Y, 1M, 1C, and 1K have the same configuration except that the colors of the images to be formed are different. Only the image forming process of the process cartridge 1Y will be described, and the process cartridges 1M, 1C, and 1K will be described. Description is omitted.

  The scanner unit 13Y irradiates a laser beam to the photosensitive drum 11Y of the process cartridge 1Y based on the input image information. At this time, the photosensitive drum 11Y is charged in advance by the charger 12Y, and an electrostatic latent image is formed on the photosensitive drum 11Y by being irradiated with a laser beam. Thereafter, the electrostatic latent image is developed by the developing device 14Y, and a yellow (Y) toner image is formed on the photosensitive drum 11Y.

  Similarly, magenta (M), cyan (C), and black (K) toner images are formed on the photosensitive drums of the process cartridges 1Y, 1M, and 1K. The toner images of each color formed on each photosensitive drum are transferred to the intermediate transfer belt 36 by the primary transfer rollers 35Y, 35M, 35C, 35K, and are conveyed to the secondary transfer inner roller 37 by the rotating intermediate transfer belt 36. . The image forming process of each color is performed at a timing of superimposing on the upstream toner image primarily transferred on the intermediate transfer belt 36.

  The sheet S is fed from the cassette feeding unit 60 or the door unit 2 in parallel with the above-described image forming process. The cassette feeding section 60 has four-stage cassettes 61, 62, 63, 64 and cassette feeding rollers 71, 72, 73, 74 corresponding to the respective cassettes. Then, a cassette is appropriately selected and sheets are fed.

  The fed sheet S is corrected for skew by the registration roller pair 75, and is conveyed at a predetermined conveyance timing. The full-color toner image on the intermediate transfer belt 36 is transferred to the sheet S by the inner secondary transfer roller 37 and the outer secondary transfer roller 41. The sheet S to which the toner image has been transferred is conveyed by the belt conveying body 42, and a predetermined heat and pressure are applied in the fixing device 5 to fuse and fix the toner. The sheet S that has passed through the fixing device 5 is discharged from the discharge port 50 to the outside of the apparatus.

  When images are formed on both sides of the sheet, the sheet S on which an image has been formed on the first side and has passed through the fixing device 5 is conveyed to the reversing conveyance path 52, and is switched back and conveyed so that the front and back and the front and back are reversed. . Then, the sheet S is again conveyed to the registration roller pair 75 via the double-sided conveyance path 85, and the toner image is transferred to the second surface by the inner secondary transfer roller 37 and the outer secondary transfer roller 41.

  The printer 100 includes a display device 9 including a liquid crystal panel capable of displaying various information related to the printer 100 and an operation unit. The display device 9 displays error information of the printer 100, information on replacement time of consumable parts, information on various settings of the printer 100 when the image forming unit 1 forms an image on the sheet S, and the like. The display device 9 is supported by a support arm 10 as a support member that is disposed on the back side of the door unit 2 in FIG. The support arm 10 extends from the lower end of the door unit 2 to the upper end of the printer 100 in the vertical direction.

[Manual feed door]
Next, the door unit 2 will be described in detail. The door unit 2 includes an exterior unit 20 supported by the apparatus main body 90 so as to be openable and closable, a manual tray 18 on which sheets S are stacked, and a sheet for feeding the sheets S stacked on the manual tray 18 to the image forming unit 1. And a feeding unit 3.

  The exterior unit 20 is integrally formed of a synthetic resin into a box shape, and is disposed so as to protrude from a side surface 91 of the apparatus main body 90, and holds the manual feed tray 18 as a sheet stacking unit and the sheet feeding unit 3. . The manual feed tray 18 is supported so as to be openable and closable with respect to the exterior unit 20 around an axis extending in the width direction W (see FIG. 5) of the sheets S stacked on the manual feed tray 18. The sheet S is configured to be able to be stacked in an open state with respect to the sheet 20. The sheet feeding unit 3 has a pickup roller 70 as a feeding roller, a feed roller 77, a retard roller 76, and a drive motor 30 (see FIG. 3) as a drive source, and generates a driving force. Driven by the drive motor 30.

  The pickup roller 70 is supported by a pickup arm 78 so as to be able to move up and down, and is rotated by the driving force of the drive motor 30 while being pressed against the uppermost sheet of the sheets S stacked on the manual feed tray 18 by a spring (not shown). The feed roller 77 is rotated by the driving force of the drive motor 30, and conveys the sheet S fed by the pickup roller 70.

  The retard roller 76 is pressed against the feed roller 77 from below, and is rotated by a driving force in a direction opposite to the sheet conveying direction from the driving motor 30 via a torque limiter (not shown) to rotate the conveyed sheet S by one. Separate each sheet. Note that the pickup roller 70 constitutes a feeding unit in the present embodiment, and the feed roller 77 and the retard roller 76 constitute a separating unit in the present embodiment. With this configuration, the sheet feeding unit 3 feeds one sheet at a time from the top sheet of the sheets S stacked on the manual feed tray 18. The sheet S fed by the sheet feeding unit 3 is transported downstream in the sheet transport direction by a pair of pull-out rollers 89 provided in the apparatus main body 90.

  As shown in FIGS. 2 to 4, the door unit 2 opens and closes with respect to the apparatus main body 90 around a vertically extending axis L via a cylindrical shaft portion 6 disposed adjacent to the support arm 10. Supported as possible.

  The door unit 2 has a handle 7 that can be operated from the outside in a state where the door unit 2 is closed with respect to the apparatus main body 90. The handle 7 engages with the handle receiving portion 8 of the apparatus main body 90 in a state where the door unit 2 is closed with respect to the apparatus main body 90, and regulates the opening of the door unit 2. When the handle 7 is operated and the engagement between the handle 7 and the handle receiving portion 8 is released, the door unit 2 is opened and closed. When the door unit 2 is opened, the feed roller 77 and the retard roller 76 of the door unit 2, the pull-out roller pair 89 of the apparatus main body 90 (see FIG. 1), and the like are exposed to perform maintenance work and work for removing jammed sheets. It is in a state where it can be performed.

  As shown in FIG. 5, the exterior unit 20 includes a bottom surface 21 (see FIG. 1) disposed outside the side surface 91 of the apparatus main body 90, a lower surface 22, an upper surface 23 opposed to the lower surface 22, an upper surface 23, and a lower surface 22 and a left side surface 26 facing the right side surface 25. The bottom surface 21 is arranged along the side surface 91 of the apparatus main body 90. The lower surface 22 extends in the width direction W of the sheets S stacked on the manual feed tray 18 (see FIG. 1). The right side surface 25 has a first surface 27 extending in the vertical direction, and a second surface 28 connecting the upper end of the first surface 27 and the upper surface 23 and extending so as to be inclined with respect to the vertical direction. . That is, the center of the first surface 27 in the up-down direction is located below the line C, which is the center of the door unit 2 in the up-down direction.

  As described above, the exterior portion 20 has the recessed portion D1 having the depressed corner formed by the extension surface P1 of the upper surface 23 and the extension surface P2 of the first surface 27 formed by the first surface 27, the second surface 28, and the upper surface 23. ing. The axis L is disposed near the side surface 91 of the apparatus main body 90, that is, near the end of the first surface 27 on the near side in FIG. Further, a plurality of reinforcing ribs R are formed on the inner side of the exterior part 20, and the rigidity is improved by the reinforcing ribs R to reduce distortion and deformation when an external force is applied.

  Further, the rotation shaft 19 (see FIG. 1) of the manual feed tray 18 and the sheet feeding unit 3 are arranged on one side with respect to a line C which is the center of the upper surface 23 and the lower surface 22 in the vertical direction, that is, the center of the door unit 2 in the vertical direction. That is, it is arranged in a region B which is a lower region. Further, since the door unit 2 does not have a heavy component such as a driving component on the other side of the line C, that is, the upper side, the center of gravity G of the door unit 2 is located at the center of the door unit 2 in the vertical direction. It is located in an area B which is an area below a certain line C.

  As shown in FIG. 6, when the door unit 2 is open to the apparatus main body 90, the first surface 27 of the exterior unit 20 contacts the support arm 10 from the lower end to the upper end of the first surface 27. In contact therewith, the opening angle of the door unit 2 is regulated. Specifically, when the door unit 2 is opened at a predetermined angle with respect to the apparatus main body 90, the end 29 on the bottom surface 21 side of the first surface 27, that is, the end portion 29 on the near side in FIG. It contacts the support arm 10 over the upper end. In this manner, the end 29 of the first surface 27 on the bottom surface 21 side that comes into contact with the support arm 10 in a state where the door unit 2 is opened to the apparatus main body 90 has its upper end positioned below the upper surface of the door unit 2. are doing.

  The above-described center of gravity G is located at a position overlapping the end 29 of the first surface 27 on the bottom surface 21 side in the vertical direction. Further, the support arm 10 constitutes a restricting portion in the present embodiment, and the end portion 29 on the bottom surface 21 side of the first surface 27 constitutes a contact area in the present embodiment. That is, the center of the contact area in the up-down direction is located below the line C, which is the center of the door unit 2 in the up-down direction. As described above, the door unit 2 is in contact with the support arm 10 at a position overlapping the center of gravity G in the up-down direction in a state where the door unit 2 is opened with respect to the apparatus main body 90, and at the top of the door unit 2 where the concave portion D1 is located. It is configured not to come into contact with 10.

  Further, the printer 100 connects the apparatus main body 90 and the door unit 2, and holds the door unit 2 in an open state with respect to the apparatus main body 90 in a state where the door unit 2 is open to the apparatus main body 90. It has an arm. The holding arm has a base portion provided on the device main body 90 side, and an arm portion having one end connected to the door unit 2 side and the other end sliding with the base portion. A recess is formed on the sliding surface of the base on which the arm slides, and a protrusion is formed on the other end of the arm. With the door unit 2 opened to the apparatus main body 90, the projection of the arm unit engages with the recess of the base unit, and the opening angle of the door unit 2 is maintained. When the door unit 2 is pressed with a predetermined force or more in the closing direction in a state where the protrusion of the arm is engaged with the protrusion of the base, the protrusion of the arm rides over the recess of the base and the recess of the base. The engagement between the arm and the protrusion of the arm is released.

[Example]
Hereinafter, an example as an example according to the present embodiment will be described. In the example according to the present embodiment, the total mass of the manual feed tray 18 and the sheet feeding unit 3 (see FIG. 2) excluding the drive motor 30 is 3.5 kg, the mass of the drive motor 30 is 0.5 kg, The total mass of other parts including the exterior part 20 is 0.9 kg. With these arrangements, the center of gravity G of the door unit 2 is located at the position shown in FIG. More specifically, the center of gravity G is located at a position further away from the axis L than the right side surface 25 in a radial direction orthogonal to the axis direction of the axis L. That is, the end portion 29 (see FIG. 6) of the first surface 27 on the bottom surface 21 side is located at a position closer to the axis L than the center of gravity G in the radial direction of the axis L.

  Under these conditions, when the door unit 2 is opened with respect to the apparatus main body 90, the upper part J, which is the open end on the opposite side to the axis L, of the door units 2 of the examples and comparative examples according to the present embodiment and The measurement result of the deformation amount of the lower portion K (both see FIG. 2) will be described. The door unit of the comparative example is different from the door unit 2 of the example according to the present embodiment only in that the first surface 27 extends to the upper surface 23 and the concave portion D1 is not formed.

  In this measurement, the door unit of the comparative example and the example according to the present embodiment was rotated in a direction in which the door unit was opened with respect to the apparatus main body 90, and the door unit was brought into contact with the support arm 10 at a predetermined angular velocity. The displacement in the turning direction and the time change of the upper J and lower K manual feed doors were recorded.

  As shown in FIG. 7, the upper unit J and the lower unit K of the door unit of the comparative example and the example according to the present embodiment both deform while the door unit is deformed by the inertial force after the door unit abuts on the support arm 10. The door unit is displaced in a direction to open with respect to the apparatus main body 90. Thereafter, the upper part J and the lower part K are displaced in a direction in which the door unit is closed with respect to the apparatus main body 90, and the opening angle of the door unit is held by the holding member, so that the door unit is repeatedly opened and closed. Vibrates when displaced.

  In the door unit of the comparative example, the maximum value of the displacement of the upper part J is smaller than the maximum value of the displacement of the lower part K, which indicates that the door unit is twisted. This is because the center of gravity G is located in the area B below the line C, and the area B where the lower part K is located is closer to the door unit than the area A where the upper part J is located. It is considered that this is because the inertia force of is large.

  On the other hand, in the door unit 2 of the example according to the present embodiment, the difference between the maximum value of the displacement of the lower part K and the maximum value of the displacement of the upper part J is smaller than that of the comparative example, and the torsion of the door unit 2 is smaller than that of the comparative example. It turns out that it is small. This is because the concave unit D1 of the region A does not abut on the support arm 10, so that the door unit 2 of the example according to the present embodiment has a larger area J where the upper part J is located than the door unit of the comparative example. Is likely to be displaced by inertial force.

  Further, it can be seen that the amplitude of the vibration generated after the door unit 2 of the example according to the present embodiment abuts on the support arm 10 is smaller than the door unit of the comparative example. As described above, the door unit 2 is configured such that the concave portion D1 is formed so that the load received by the vibration after contacting the support arm 10 is reduced.

  As described above, in the first embodiment, in the printer 100, the center of gravity G of the door unit 2 is located below the line C, which is the center in the vertical direction of the door unit 2, and the concave portion D1 is It is configured to be formed below C. Thereby, the torsion of the door unit 2 when the door unit 2 is opened can be reduced, the failure of the door unit 2 can be reduced, and the feeding quality of the sheet S can be improved. In addition, when the door unit 2 comes into contact with the support arm 10, the burden on the door unit 2 due to vibration can be reduced. Further, by reducing the load received by the torsion and vibration of the door unit 2, the reinforcing ribs R of the exterior unit 20 can be reduced, and the weight of the door unit 2 can be reduced and the formability of the exterior unit 20 can be reduced. Can be improved.

  Further, in the first embodiment, the printer 100 is configured such that when the door unit 2 is opened, the support arm 10 abutting on the exterior part 20 of the door unit 2 regulates the opening angle of the door unit 2. ing. Accordingly, it is easy to secure a work space in a state where the door unit 2 is opened with respect to the apparatus main body 90, and it is possible to improve workability in maintenance work, work for removing jammed sheets, and the like.

  In the above-described embodiment, in the printer 100, the center of gravity G of the door unit 2 is located below the line C, which is the center in the vertical direction of the door unit 2, and the concave portion D1 is located above the line C. It is configured to be formed on the side, but is not limited to this. The printer 100 is configured such that the center of gravity G of the door unit 2 is located on one side with respect to a line C, which is the center in the vertical direction of the door unit 2, and the concave portion D1 is formed on the other side with respect to the line C. It should just be. For example, the printer 100 may be configured such that the center of gravity G of the door unit 2 is located above the line C, which is the center in the vertical direction of the door unit 2, and the concave portion D1 is formed below the line C. It may be configured.

  Further, in the above-described embodiment, the printer 100 is configured such that the upper surface 23, the lower surface 22, the first surface 27, and the second surface 28 are flat surfaces without irregularities, but the present invention is not limited to this. The printer 100 may be configured to be able to reduce torsion and vibration of the door unit 2 when the door unit 2 is opened. For example, in the printer 100, the upper surface 23, the lower surface 22, the first surface 27, and the second surface 28 have irregularities that do not greatly affect the twisting and vibration of the door unit 2 when the door unit 2 is opened. Or may be configured as a curved surface or the like. In such a case, the line C may be the center between the upper end and the lower end of the door unit 2 in the vertical direction. Further, the shape of the concave portion D1 is not limited to the above. Any shape may be used as long as the first surface 27 is in contact with the support arm 10 and does not contact the support arm 10 or the apparatus main body 90.

  Further, in the above-described embodiment, the printer 100 is configured such that the support arm 10 extends from the lower end of the door unit 2 to the upper end of the printer 100 in the vertical direction, but is not limited thereto. The support arm 10 may extend at least from the lower end to the upper end of the door unit 2 in the vertical direction, and more specifically, may extend from the lower end to the upper end of the first surface 27. In this case, the upper end and the lower end do not mean the upper and lower ends in a strict sense.

  Further, in the above-described embodiment, the support arm 10 supported by the apparatus main body 90 constitutes the restricting portion that restricts the opening angle of the door unit 2, but is not limited thereto. The restricting portion may be in contact with the door unit 2 in an open state with respect to the apparatus main body 90 and may restrict the opening angle of the door unit 2. For example, another component provided in the apparatus main body 90 may be a restricting portion. Or the side surface 91 of the apparatus main body 90 may constitute a restricting portion. Further, the printer 100 may be configured so that the first surface 27 abuts before the second surface 28 with the door unit 2 opened to the apparatus main body 90. For example, when the printer 100 is opened with respect to the apparatus main body 90, after the first surface 27 abuts on the support arm 10, the second surface 28 abuts on the support arm 10 due to the distortion of the door unit 2. It may be constituted as follows.

<Second embodiment>
Next, a printer 101 according to a second embodiment will be described. Note that the second embodiment is the same as the first embodiment except for the shape of the exterior part and the support arm, and the other configuration is the same. Therefore, the description of the same configuration will be omitted.

  As shown in FIG. 8, the manual feed door 62 according to the second embodiment has the exterior part 20 supported by the apparatus main body 90. The exterior unit 20 includes a bottom surface 21 (see FIG. 1) disposed outside the side surface 91 of the apparatus main body 90, a lower surface 22, an upper surface 64 facing the lower surface 22, a vertically extending upper surface 64 and a lower surface 22. , And a left side surface 26 facing the right side surface 65. The support arm 40 extends vertically from the lower end of the manual feed door 62 to the upper end of the printer 101, and faces the upper end 66 of the right side surface 65 in a state where the manual feed door 62 is open to the apparatus main body 90. It has a concave portion D2.

  When the manual feed door 62 is open to the apparatus main body 90, the end 67 on the bottom surface 21 side of the right side surface 65 of the exterior part 63 abuts on the support arm 40, and the opening angle of the manual feed door 62 is reduced. Be regulated. Note that the support arm 40 constitutes a restricting portion in the present embodiment, and a region 68 of the end portion 67 on the bottom surface 21 side of the right side surface 65 which is in contact with the support arm 40 excluding the upper end portion 66 is the present embodiment. In the contact area.

  As described above, in the second embodiment, the printer 101 does not require the shape restriction such as forming the concave portion D1 in the door unit 2 unlike the first embodiment, Can be reduced when the door is opened. Further, similarly to the first embodiment, when the door unit 2 comes into contact with the support arm 10, the load on the door unit 2 due to vibration can be reduced.

  In the second embodiment, the support arm 40 has the concave portion D2 and forms a restricting portion that restricts the opening angle of the manual feed door 62. However, the present invention is not limited to this. The restricting section may be in contact with the door unit 2 in an open state with respect to the apparatus main body 90, and may be any type as long as the opening angle of the door unit 2 can be restricted. For example, another component provided in the device main body 90 may constitute a regulating portion having the concave portion D2, or the side surface 91 of the device main body 90 may constitute a regulating portion having the concave portion D2.

  Further, in any of the above-described embodiments, the printer is not limited to an electrophotographic laser beam printer. For example, the present invention can be applied to an inkjet printer that forms an image on a sheet by discharging ink liquid from nozzles.

  2: door unit / 3: sheet feeding unit / 9: display device / 10: support arm (regulator, support member) / 18: manual feed tray (sheet stacking unit) / 22: lower surface / 23: upper surface / 25: side surface / 27: first surface / 28: second surface / 29: end (contact area) / 30: drive motor (drive source) / 62: manual feed door (door) / 65: side surface / 68: area ( Contact area) / 70: pickup roller (feeding means) / 76: retard roller (separating means) / 77: feed roller (separating means) / 90: apparatus main body / 100: printer (image forming apparatus) / 101: printer (Image forming apparatus) / C: line (center) / D2: concave / G: center of gravity / L: axis / S: sheet

Claims (9)

An apparatus main body having an image forming unit for forming an image on a sheet,
A door unit that is supported to be openable and closable with respect to the apparatus main body around an axis extending in a vertical direction, wherein a sheet stacking unit on which sheets are stacked and a sheet stacked on the sheet stacking unit are formed by the image forming unit A sheet feeding unit for feeding the sheet to the door unit,
A regulating unit that contacts the contact area of the door unit in a state where the door unit is opened with respect to the apparatus main body, and regulates an opening angle of the door unit;
The center of gravity of the door unit is located at a position overlapping the contact area in the vertical direction,
The center and the center of gravity of the contact area in the vertical direction are located on one side with respect to the center of the door unit in the vertical direction.
An image forming apparatus comprising: The contact area is located at a position closer to the axis than the center of gravity in the radial direction of the axis,
The image forming apparatus according to claim 1, wherein: A sheet feeding unit configured to feed a sheet stacked on the sheet stacking unit; a separating unit configured to separate sheets fed by the feeding unit one by one; A driving source for generating a driving force for driving the separation unit,
The image forming apparatus according to claim 1, wherein: The center and the center of gravity of the contact area in the up-down direction are located below the center of the door unit in the up-down direction,
The image forming apparatus according to claim 1, wherein: The regulating portion extends from a lower end to an upper end of at least the door unit in the vertical direction,
The center of the upper surface of the door unit and the lower surface of the door unit in the vertical direction is the center of the door unit in the vertical direction,
The upper end of the contact area is located below the upper surface of the door unit,
The image forming apparatus according to claim 4, wherein: A side surface of the door unit connects the first surface on which the contact area is formed and extends in the vertical direction, an upper end of the first surface and the upper surface of the door unit, and is inclined with respect to the vertical direction. And a second surface extending like
The image forming apparatus according to claim 5, wherein: The vertical center of the upper surface of the door unit and the lower surface of the door unit is the center of the door unit in the vertical direction,
The side surface of the door unit where the contact area is formed connects the lower surface and the upper surface of the door unit,
The regulating portion has a concave portion facing the upper end portion of the side surface when the door unit is open to the apparatus main body, and at least the upper end portion of the door unit from the lower end portion of the door unit in the vertical direction. Extending to
The image forming apparatus according to claim 4, wherein: A display device capable of displaying information on settings of the image forming apparatus,
The regulating unit is a support member that is supported by the device body and supports the display device.
The image forming apparatus according to claim 1, wherein: An apparatus main body having an image forming unit for forming an image on a sheet,
A door unit that is supported to be openable and closable with respect to the apparatus main body around an axis extending in a vertical direction, wherein a sheet stacking unit on which sheets are stacked and a sheet stacked on the sheet stacking unit are formed by the image forming unit A door unit having a feed roller for feeding
A regulating unit that contacts the contact area of the door unit in a state where the door unit is opened with respect to the apparatus main body, and regulates an opening angle of the door unit;
The feed roller is located at a position overlapping the contact area in the vertical direction,
The center of the contact area in the up-down direction and the feed roller are located on one side with respect to the center of the door unit in the up-down direction.
An image forming apparatus comprising:

Images