JP2019159144A - Image forming device - Google Patents

Abstract

To downsize a brake mechanism provided in an opening/closing member.SOLUTION: Provided is an image forming device comprising: a device body 1; an upper cover 31 and a middle cover 32 rotating around the same support shaft 33 and opened/closed on the device body 1; a first torque limiter 41 provided in the upper cover 31, for adding resistive force to the rotating motion of the upper cover 31; and a second torque limiter 42 provided in the middle cover 32, for adding resistive force to the rotating motion of the middle cover 32. The first torque limiter 41 includes a first projection 43, and the second torque limiter 42 has a second projection 44 brought into contact with the first projection 43, respectively. When the upper cover 31 is placed, by its rotating motion, at a prescribed angle of rotation relative to the middle cover 32, the first projection 43 is brought into contact with the second projection 44, and the resistive force of the second torque limiter 42 is imparted to the rotating motion of the upper cover 31 by this contact.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an image forming apparatus.

  As an opening / closing member provided in the image forming apparatus, an upper cover for opening and closing the scanner unit and a cover member for opening the inside of the image forming apparatus to replace parts and remove jammed paper are provided. In particular, the upper cover is provided with an automatic document feeder (ADF) for feeding a document to the scanner section of the image forming apparatus, and its weight tends to increase.

  Some open / close members such as the upper cover are provided with a brake mechanism for applying a resistance force to the open / close operation. In other words, the open / close member is unintentionally closed by its own weight, and a user's hand is sandwiched between the open / close member and the image forming apparatus main body, or the open / close member is vigorously closed and damaged. In order to prevent this, a brake mechanism is provided.

  For example, in Patent Document 1 (Japanese Patent No. 5446858), a brake unit is provided on an upper cover provided in an image forming apparatus. The brake unit includes a brake gear provided on the upper cover side and a rack portion provided on the image forming apparatus main body side and meshing with the brake gear. A frictional force is generated between the brake gear and the rack in accordance with the opening / closing operation of the upper cover, and a braking force (resistance force) against the opening / closing operation of the upper cover can be generated.

  The braking force required for the opening / closing member increases in proportion to the weight of the opening / closing member. For this reason, in particular, when a plurality of opening / closing members are provided in the apparatus, or when the opening / closing member is heavy, such as an upper cover provided with an ADF, the brake mechanism is also enlarged in proportion thereto. Thereby, there existed a subject that the enlargement of the whole apparatus was caused and the restrictions on the layout of the apparatus were seriously limited.

  Under such circumstances, an object of the present invention is to reduce the size of the brake mechanism provided in the opening / closing member.

  In order to solve the above-described problems, the present invention provides an apparatus main body, a first opening / closing member that rotates about the same support shaft and that is opened / closed with respect to the apparatus main body, a second opening / closing member, and the first opening / closing member. A first brake mechanism that is provided on the member and imparts resistance to the rotational movement of the first opening and closing member; and is provided on the second opening and closing member and imparts resistance to the rotational movement of the second opening and closing member. An image forming apparatus including a second brake mechanism, wherein the first brake mechanism includes a contact portion, and the second brake mechanism includes a contacted portion that contacts the contact portion. When the first opening / closing member is arranged at a predetermined rotation angle with respect to the second opening / closing member by the rotation operation, the contact portion contacts the contacted portion, and the contact causes the first opening / closing member to The resistance force of the two brake mechanisms is applied to the rotational movement of the first opening / closing member. Characterized in that it is applied to.

  In the present invention, since the resistance force of the second brake mechanism can be applied to the first brake mechanism, the resistance force required for the first brake mechanism can be reduced and the first brake mechanism can be downsized.

1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention. It is the figure which showed a mode that the upper cover was open | released to the middle. It is the figure which showed a mode that the upper cover and the middle cover were open | released to the middle. It is the figure which showed a mode that the upper cover and the middle cover were open | released. It is a figure which shows a 1st control part. It is a figure which shows a 2nd control part. It is a perspective view of a brake mechanism. It is a side view of a brake mechanism. It is a front view of a brake mechanism. It is a figure which shows transition of brake force, (a) A figure is an upper cover, (b) A figure is a figure which shows a middle cover. It is a figure which shows the modification of a 2nd control part.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

  In the center of the color image forming apparatus 1 shown in FIG. 1, an image forming unit 2 in which four process units 9Y, 9M, 9C, 9Bk are detachably provided is arranged. Each process unit 9Y, 9M, 9C, 9Bk contains developers of different colors of yellow (Y), magenta (M), cyan (C), and black (Bk) corresponding to the color separation components of the color image. The configuration is the same except that.

  Specifically, each process unit 9 includes a photosensitive drum 10 that is a drum-like rotating body capable of carrying toner as a developer on the surface, a charging roller that uniformly charges the surface of the photosensitive drum 10, and the like. And a developing device 12 having a developing roller and the like.

  At the top of the image forming apparatus 1, toner bottles 26Y, C, M, and Bk filled with yellow, cyan, magenta, and black toners are detachably provided. Each color toner is supplied to each color developing device 12 through a supply path provided between the toner bottles 26Y, 26C, 26M, and Bk and each developing device 12.

  An exposure unit is disposed above the process unit 9. The exposure unit is configured to emit laser light based on the image data.

  A transfer unit 4 is disposed immediately below the image forming unit 2. The transfer unit 4 is opposed to the endless intermediate transfer belt 16 stretched around the driving roller 14 and the driven roller 15 so as to be able to run around, and the photosensitive drum 10 of each process unit 9 sandwiching the intermediate transfer belt 16 therebetween. The primary transfer roller 17 is disposed at the position. Each primary transfer roller 17 presses the inner peripheral surface of the intermediate transfer belt 16 at each position, and a primary transfer nip is formed at a place where the pressed portion of the intermediate transfer belt 16 and each photosensitive drum 10 come into contact. Has been.

  A secondary transfer roller 18 is disposed at a position opposite to the drive roller 14 of the intermediate transfer belt 16 and the drive roller 14 across the intermediate transfer belt 16. The secondary transfer roller 18 presses the outer peripheral surface of the intermediate transfer belt 16, and a secondary transfer nip is formed at a location where the secondary transfer roller 18 and the intermediate transfer belt 16 are in contact with each other.

  A toner density sensor 50 is provided below the intermediate transfer belt 16 so as to face the lower surface thereof. The toner density sensor 50 faces the flat surface 16 a of the intermediate transfer belt 16 and can detect the toner density and the position of the toner image on the surface of the intermediate transfer belt 16.

  The paper feed unit 5 is located below the image forming apparatus 1 and includes a paper feed cassette 19 that stores paper P as a recording medium, a paper feed roller 20 that carries the paper P out of the paper feed cassette 19, and the like. ing.

  The conveyance path 6 is a conveyance path that conveys the paper P carried out from the paper feeding unit 5, and the conveyance roller pair is located in the middle of the conveyance path 6 until it reaches the paper discharge unit 8 described later in addition to the pair of registration rollers 21. Are appropriately arranged.

  The fixing device 7 includes a fixing roller 22 that is heated by a heating source, a pressure roller 23 that can press the fixing roller 22, and the like.

  The paper discharge unit 8 is provided on the most downstream side of the conveyance path 6 of the image forming apparatus 1. The paper discharge unit 8 is provided with a pair of paper discharge rollers 24 for discharging the paper P to the outside and a paper discharge tray 25 for stocking the discharged paper P.

  An ADF (automatic conveyance device) 46 is disposed above a scanner unit (reading unit) 47. The ADF 46 is for automatically conveying the paper P placed on the paper table to the scanner unit 47. The scanner unit 47 has a contact glass as a reading surface for reading paper, and a reading mechanism such as a sensor therein.

  The basic operation of the image forming apparatus 1 will be described below with reference to FIG.

  In the image forming apparatus 1, when an image forming operation is started, an electrostatic latent image is formed on the surface of the photosensitive drum 10 of each process unit 9Y, 9C, 9M, 9Bk. The image information exposed to the photosensitive drums 10 by the exposure unit is single-color image information obtained by separating a desired full-color image into color information of yellow, cyan, magenta, and black. An electrostatic latent image is formed on each photoconductor drum 10, and the toner stored in each developing device 12 is supplied to the photoconductor drum 10 by a drum-shaped developing roller, whereby the electrostatic latent image becomes visible. It is visualized as a toner image (developer image) which is an image.

  In the transfer unit 4, the intermediate transfer belt 16 is driven to run in the direction of the arrow in the drawing by the rotational drive of the drive roller 14. Further, each primary transfer roller 17 is applied with a constant voltage or a constant current-controlled voltage having a polarity opposite to the charging polarity of the toner. As a result, a transfer electric field is formed in the primary transfer nip, and the toner images formed on the respective photosensitive drums 10 are sequentially superimposed and transferred onto the intermediate transfer belt 16 in the primary transfer nip.

  On the other hand, when the image forming operation is started, the sheet P stored in the sheet feeding cassette 19 is moved to the transport path 6 by rotating the sheet feeding roller 20 of the sheet feeding unit 5 below the image forming apparatus 1. Sent out. The sheet P sent to the conveyance path 6 is timed by the registration roller 21 and is sent to the secondary transfer nip between the secondary transfer roller 18 and the drive roller 14. At this time, a transfer voltage having a polarity opposite to the toner charging polarity of the toner image on the intermediate transfer belt 16 is applied, and a transfer electric field is formed in the secondary transfer nip. The toner images on the intermediate transfer belt 16 are collectively transferred onto the paper P by the transfer electric field formed in the secondary transfer nip.

  The sheet P on which the toner image is transferred is conveyed to the fixing device 7, and the sheet P is heated and pressed by the fixing roller 22 and the pressure roller 23, and the toner image is fixed on the sheet P. Then, the paper P on which the toner image is fixed is separated from the fixing roller 22, transported by a pair of transport rollers, and discharged to the paper discharge tray 25 by the paper discharge roller 24 in the paper discharge unit 8.

  The above description is an image forming operation when a full color image is formed on the paper P. A single color image can be formed using any one of the four process units 9Y, 9C, 9M, and 9Bk. It is also possible to form two or three color images using two or three process units 9.

  Next, the configuration of the upper cover, the middle cover, and the periphery thereof according to this embodiment will be described.

  As shown in FIG. 1, an upper cover 31 as a first opening / closing member is provided on the upper portion of the image forming apparatus 1. A middle cover 32 as a second opening / closing member is provided below the upper cover 31.

  The upper cover 31 includes an ADF 46 and is provided so as to be rotatable around the support shaft 33 together with the ADF 46. The intermediate cover 32 includes toner bottles 26Y, 26C, 26M, and 26K, and is provided so as to be rotatable around the support shaft 33 together with the toner bolts.

  Next, the opening / closing operation of the upper cover and the middle cover will be described. In addition, the angle demonstrated below is the angle of each cover with respect to the horizontal line X of FIG. 2 which shows the rotation angle from the closed state (state of FIG. 1) of each cover as 0 degree | times.

  When opening the upper cover 31 and the middle cover 32, the upper cover 31 is first opened by an angle α1, as shown in FIG. When the middle cover 32 is closed, the rotation angle of the upper cover 31 is restricted by the first restricting portion, and the upper cover 31 can be opened only to the angle α1. In the present embodiment, α1 is set to 70 degrees. In this state, the toner bottles 26 </ b> Y, C, M, and Bk provided on the middle cover 32 can be attached to and detached from the image forming apparatus 1.

  Subsequently, as shown in FIG. 3, the upper cover 31 and the middle cover 32 are simultaneously opened, and the upper cover 31 is moved to the upright position and the middle cover is moved to the position of the angle β1. That is, the angle at which the upper cover 31 and the middle cover 32 are rotated is 20 degrees, α2 is 90 degrees, and β1 is 20 degrees.

  Finally, as shown in FIG. 4, the middle cover 32 is rotated to the upright position. That is, the angle at which the middle cover 32 is rotated at this time is 70 degrees, and β2 is 90 degrees. In this state, the photosensitive unit including each process unit 9 and the photosensitive drum 10 can be detached from the main body of the image forming apparatus 1. In the present embodiment, the state where the upper cover 31 and the middle cover 32 stand upright (the state where α2 and β2 are 90 degrees) is a state where these covers are completely opened. That is, the rotation angle of the upper cover 31 (and the middle cover 32) is regulated by the second regulating part and cannot be opened more than 90 degrees.

  As described above, the upper cover 31 and the middle cover 32 can be opened. On the contrary, the middle cover 32 and the upper cover 31 can be closed in the reverse order of the above as shown in FIG. 4 → FIG. 3 → FIG. 2 → FIG.

Next, the first restricting portion that restricts the rotation angle (opening angle) of the upper cover 31 to the angle α1 will be described.
As shown in FIG. 5A, the first restricting portion 60 includes a first arm 34 as a first link member, an engaging portion 35 provided at an end of the first arm 34, and an engaging portion 35. Has a first groove (first recess) 32a to be engaged.

  The 1st groove | channel 32a is provided in the inside cover 32, and is holding the engaging part 35 in the inside so that a movement is possible.

  One end of the first arm 34 is fixed to the upper cover 31, and an engaging portion 35 is provided on the other end.

  The first arm 34 and the first groove 32a are formed in an arc shape having a constant same curvature. In a state where the upper cover 31 is closed, the engaging portion 35 is disposed on the one end side 32a1 side of the first groove 32a. The first arm 34 and the engaging portion 35 are provided so as to be movable in the first groove 32 a in conjunction with the opening / closing operation of the upper cover 31. On the other end side 32a2 of the first groove 32a, a protrusion (engagement portion) 32b that engages with the engagement portion 35 is provided.

  As shown in FIG. 5B, when the upper cover 31 is rotated in the direction to open up to the angle α1, the first arm 34 and the engaging portion 35 move in the rotational direction in conjunction with this rotational operation. Thereby, the first arm 34 jumps out of the first groove 32a, and the engaging portion 35 moves to the position on the other end side 32a2 of the first groove 32a. In this state, the engaging portion 35 engages with the protrusion 32b, and the engaging portion 35 cannot move any further. That is, the rotation range of the upper cover 31 can be restricted to the angle α1. More specifically, the rotation angle of the upper cover 31 with respect to the middle cover 32 can be limited to an angle α1.

  Then, as shown in FIG. 5C, by rotating the middle cover 32 together with the upper cover 31 in the opening direction, the upper cover 31 can be further opened while maintaining the angle with respect to the middle cover 32 of the upper cover 31. The upper cover 31 can be rotated to the upright position.

  Finally, as shown in FIG. 5D, the middle cover 32 can be rotated to the upright direction. At this time, the engaging portion 35 relatively moves in the first groove 32a.

  As described above, the engagement portion 35 is moved in the first groove 32a and is engaged with the protrusion 32b provided on the other end side 32a2 of the first groove 32a, whereby the upper cover 31 is rotated alone. The range can be regulated.

Next, the second restricting portion that restricts the rotation range of the upper cover 31 and the middle cover 32 to the upright position will be described.
As shown to Fig.6 (a), the 2nd control part 70 has the 2nd arm 36 as a 2nd link member, and the 2nd groove | channel 37 as a 2nd recessed part. One end 36 a of the second arm 36 is fixed to the upper cover 31, and the other end 36 b is provided so as to be movable in the second groove 37. The second groove 37 is provided in the image forming apparatus main body and extends in the left-right direction in the drawing.

  In the closed position of the upper cover 31 in FIG. 6A, the other end 36 b of the second arm 36 is disposed on one end 37 a of the second groove 37. 6 (a) → (b) → (c), the other end 36b of the second arm 36 moves in the second groove 37 by rotating the upper cover 31 in the opening direction. . As shown in FIG. 6C, the other end 36 b of the second arm 36 is disposed on the other end 37 b of the second groove 37 in a state where the upper cover 31 is upright. As a result, the other end 36b can no longer move to the left side of the figure. Thereby, it can restrict | limit that the upper cover 31 rotates in an open direction further from an upright position.

Next, a brake mechanism provided in the image forming apparatus and a brake force generated when the upper cover and the middle cover are opened and closed will be described.
As shown in FIG. 7, a first torque limiter 41 as a first brake mechanism and a second torque limiter 42 as a second brake mechanism are provided on a support shaft 33 that is a rotation shaft of the upper cover and the middle cover. .

  The first torque limiter 41 is provided on the inner diameter side, and includes a fixed portion 41a fixed to the support shaft 33 and a movable portion 41b provided on the outer diameter side. In addition, a first protrusion 43 as a contact portion is provided on the outer peripheral side of the movable portion 41b. The movable portion 41b is fixed to the upper cover and rotates in conjunction with the opening / closing operation of the upper cover.

  The second torque limiter 42 is provided on the inner diameter side and includes a fixed portion 42a fixed to the support shaft 33 and a movable portion 42b provided on the outer diameter side. Further, a second protrusion 44 as a contacted portion is provided on the outer peripheral side of the movable portion 42b. The movable portion 42b is fixed to the middle cover and rotates in conjunction with the opening / closing operation of the middle cover.

  The first protrusion 43 has a length longer than that of the second protrusion 44, and one end side extends to the second torque limiter 42 side. In the present embodiment, the first protrusion 43 and the second protrusion 44 are provided in a rectangular parallelepiped shape, and a flat surface, which is one side surface of the first protrusion 43, is rotated by the upper cover rotation described later. It abuts against a flat surface that is one side surface.

  When a rotational force is applied to the upper cover, a frictional force is generated between the movable portion 41b that attempts to rotate integrally with the upper cover and the fixed portion 41a. This frictional force becomes a braking force (resistance force) generated for the opening / closing operation of the upper cover. Further, when a rotational force is applied to the middle cover, a frictional force is generated between the movable portion 42b that attempts to rotate integrally with the middle cover and the fixed portion 42a, and this becomes a braking force for the opening / closing operation of the middle cover.

  Next, the transition of the braking force generated in the upper cover and the middle cover in the process of opening the upper cover and the middle cover in FIGS. FIGS. 8 and 9 are views showing how the torque limiter rotates. FIGS. 8A to 8D show the torque limiter when the upper cover and the middle cover are arranged at the positions shown in FIGS. Indicates the position. FIG. 10 is a graph showing the transition of the braking force, where (a) shows the braking force generated on the upper cover, (b) shows the braking force generated on the middle cover, the horizontal axis shows the opening angle [°], and the vertical The shaft indicates the braking force F [N]. The solid line in the figure is the braking force actually generated, and the one-dot chain line is the required braking force.

  As shown in FIG. 1, when the upper cover 31 and the middle cover 32 are closed, as shown in FIG. 8A, the first protrusion 43 and the second protrusion 44 are arranged at positions separated in the circumferential direction. Has been. Then, as shown in FIG. 1 → FIG. 2, in the process of opening the upper cover 31 from the closed position to α1, only the braking force F1 of the first torque limiter 41 is applied to the upper cover 31, as shown in FIG. appear.

  1 to 2, the movable portion of the first torque limiter 41 and the first protrusion 43 rotate in the clockwise direction in the drawing as shown in FIGS. 8A to 8B. . Thereby, as shown in FIG.8 (b), the 1st protrusion 43 contact | abuts to the 2nd protrusion 44 (refer FIG. 9).

  In the section of FIG. 2 → FIG. 3, the movable portion of each torque limiter rotates while the first projection 43 abuts on the second projection 44 as shown in FIG. 8 (b) → FIG. 8 (c). To do. As a result, as shown in FIGS. 10A and 10B, the first torque limiter 41 of the upper cover 31 in the section of the angles α1 to α2 and the section of the middle cover 32 from 0 degree to the angle β1 A brake force F1 + F2 obtained by adding the brake force F1 and the brake force F2 of the second torque limiter is generated in the upper cover 31 and the middle cover 32.

  Finally, as shown in FIG. 3 → FIG. 4, when the middle cover 32 rotates to the upright position, only the movable part of the second torque limiter 42 rotates as shown in FIG. 8 (c) → FIG. 8 (d). The second protrusion 44 is separated from the first protrusion 43. Therefore, as shown in FIG. 10B, only the braking force F2 of the second torque limiter is generated in the section from β1 to angle β2 of the middle cover 32.

  Further, the braking force shown in FIGS. 10 (a) and 10 (b) is the braking force generated in each cover when the user releases the upper cover 31 and the middle cover 32 at that position (rotation due to the weight of the cover). It is also the braking force generated against the force). Contrary to the above procedure, when the upper cover 31 and the middle cover 32 are closed as shown in FIGS. 4 to 1, the braking force shown in FIGS. 10A and 10B is applied at each angle. appear.

  The closer the upper cover 31 is to the upright state, the greater the rotational force in the closing direction caused by its own weight and the greater the required braking force (see the dashed line in FIG. 10a). On the other hand, in the present embodiment, as described above, the braking force generated in the upper cover 31 is changed in two stages to correspond to the necessary braking force. That is, in the second half rotation range of the upper cover 31 that requires a larger braking force, the generated braking force is increased using the braking force F2 of the middle cover 32.

  On the other hand, in the configuration in which the brake force of the middle cover 32 is not used, it is necessary to set the brake force of the upper cover 31 to a value of F1 + F2 from the beginning, and the first torque limiter 41 is increased in size. Further, the braking force of the upper cover 31 from 0 degree to α1 becomes F1 + F2, and the operability is deteriorated. In other words, an excessive braking force is applied to the braking force required for the upper cover 31, and the operability of the upper cover 31 is deteriorated.

  As described above, even in the brake mechanism according to the present embodiment using the frictional force generated in the torque limiter, the brake force of the upper cover 31 is changed by using the brake force F2 of the middle cover 32. Can be generated and does not generate excessive braking force. In addition, since the braking force required for the first torque limiter can be reduced, the apparatus can be reduced in size. Compared with the upper cover 31 provided with ADF or the like, since the weight of the middle cover 32 is lighter, the required braking force is small (see the one-dot chain line portion in FIG. 10b). Automatic rotation due to the weight of the middle cover 32 can be prevented. Thus, in the present embodiment, it is possible to generate a braking force that matches the weight of each cover.

Next, a modified example of the second restricting portion will be described.
As shown in FIG. 11A, in this embodiment, a stopper 45 as a contacted member is provided on the rear side of the image forming apparatus 1. As shown in FIG. 11B, when the upper cover 31 rotates to the upright position, the rear surface 31 a of the upper cover 31 comes into contact with the contact surface 45 a of the stopper 45. Thereby, the stopper 45 supports the upper cover 31 from below, and the upper cover 31 can be prevented from further rotating clockwise.

  In the present embodiment, the contact surface 45 a is formed as a flat surface corresponding to the shape of the rear surface 31 a of the upper cover 31. Further, the thickness and shape of the stopper 45 are set so that the stopper 45 has sufficient strength to support the weight of the upper cover 31 and the middle cover 32. In the present embodiment, the stopper 45 has a substantially triangular cross section.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  The image forming apparatus according to the present invention is not limited to the color image forming apparatus shown in FIG. 1, but may be a monochrome image forming apparatus, a copying machine, a printer, a facsimile, or a complex machine thereof.

  Recording media include paper P (plain paper), thick paper, postcards, envelopes, thin paper, coated paper (coated paper, art paper, etc.), tracing paper, OHP sheet, plastic film, prepreg, copper foil, etc. included.

1. Image forming device (device main body)
31 Upper cover (first opening / closing member)
32 Middle cover (second opening / closing member)
32a First groove (first recess)
33 Support shaft 34 First arm (first link member)
35 engaging portion 36 second arm (second link member)
37 Second groove (second recess)
41 1st torque limiter (1st brake mechanism)
41a Fixed part 41b Movable part 43 First protrusion (contact part)
42 Second torque limiter (second brake mechanism)
42a fixed part 42b movable part 44 2nd protrusion (contacted part)
45 Stopper (contact member)
46 ADF (automatic transfer device)
47 Scanner part 60 First restriction part 70 Second restriction part

Japanese Patent No. 5446858

Claims (6)

The device body;
A first opening / closing member and a second opening / closing member that rotate about the same spindle and are opened / closed with respect to the apparatus main body;
A first brake mechanism provided on the first opening / closing member and imparting a resistance force to the rotational operation of the first opening / closing member;
An image forming apparatus comprising: a second brake mechanism that is provided on the second opening / closing member and applies a resistance force to the rotational operation of the second opening / closing member;
The first brake mechanism has a contact portion, and the second brake mechanism has a contacted portion that contacts the contact portion,
When the first opening / closing member is arranged at a predetermined rotation angle with respect to the second opening / closing member by the rotation operation, the contact portion contacts the contacted portion, and the contact causes the first opening / closing member to An image forming apparatus, wherein a resistance force of a two-brake mechanism is applied to the rotational operation of the first opening / closing member. The first brake mechanism and the second brake mechanism are provided with a fixed portion fixed to the support shaft and a movable portion provided on an outer peripheral side of the fixed portion and rotatably provided with respect to the support shaft and the fixed portion. And
The first brake mechanism and the second brake mechanism are configured such that the first opening and closing member is caused by a frictional force generated between the movable portion and the fixed portion in accordance with the rotation operation of the first opening and closing member or the second opening and closing member. Giving the resistance to the rotation of the member or the second opening and closing member,
The contact portion is provided in the movable portion of the first brake mechanism, and the contacted portion is provided in the movable portion of the second brake mechanism,
The image forming apparatus according to claim 1, wherein the contact portion contacts the contacted portion as the contact portion rotates in accordance with the rotation operation of the first opening / closing member. A first restricting portion for restricting a rotation angle of the first opening / closing member with respect to the second opening / closing member to a predetermined angle or less;
The first restricting portion includes a first link member and a first recess provided in the second opening / closing member,
One end side of the first link member is fixed to the first opening / closing member, and the other end side is provided to be movable in the first recess,
The first restricting portion restricts a rotation angle of the first opening / closing member with respect to the second opening / closing member by restricting a movement range on the other end side of the first link member within the first recess. Item 3. The image forming apparatus according to any one of Items 1 and 2. A second restricting portion for restricting a rotation angle of the first opening / closing member with respect to the apparatus main body to a predetermined angle or less;
The second restricting portion has a second link member and a second recess provided in the apparatus main body,
One end side of the second link member is fixed to the first opening / closing member, and the other end side is provided to be movable in the second recess,
The said 2nd control part controls the rotation angle with respect to the said apparatus main body of a said 1st opening / closing member by the movement range of the other end side of a said 2nd link member being controlled in the said 2nd recessed part. 4. The image forming apparatus according to any one of items 1 to 3. A contact member against which the first opening / closing member contacts;
4. The rotation range of the first opening / closing member relative to the image forming apparatus main body is regulated by the first opening / closing member contacting the contacted member by the rotation operation. Image forming apparatus. A scanner unit for reading an image on the surface of the recording medium, and an automatic conveyance device that automatically conveys the recording medium to the scanner unit;
6. The image forming apparatus according to claim 1, wherein the scanner unit and the automatic conveyance device are provided on the first opening / closing member and rotate integrally with the opening / closing member. 6.

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