JP2015225266A - Composite machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which further improvement in operability is required since it is difficult to maintain excellent operability over the whole area when it is tried to widen a rotation area in a composite machine in which a document reading device is arranged on the upper part of an image formation device and the upper part of the image formation device is made openable by making the document reading device freely rotatable.SOLUTION: A composite machine comprises: a left one-way hinge 25 which is arranged in an image formation device body 21a; a left pinion gear 27 which rotates integrally with a rotation shaft; a first left rack gear 33a which is arranged in a rotation part (31, 13, 14, 11, 15) and engaged with the left pinion gear 27 when the rotation part rotates in a first rotation area; and a second left rack gear 33b which is engaged with the left pinion gear 27 when the rotation part rotates in a second rotation area different from the first rotation area, and is configured so that the rotation directions of the pinion gear 27 are different from each other between the first rotation area and the second rotation area when the rotation part rotates in one direction.

Description

  The present invention relates to a composite apparatus, for example, a copying machine or a facsimile in which an original reading apparatus is mounted on an upper part of an image forming apparatus, or a composite apparatus in which an original reading apparatus and a printer are combined.

  2. Description of the Related Art Conventionally, in this type of apparatus, for example, an original reading apparatus is arranged on the upper part of the image forming apparatus, and at least the upper original reading apparatus can be rotated to cope with paper jams and maintenance of the image forming apparatus. There is one that is configured to be openable above (see, for example, Patent Document 1).

  Also, in this case, in order to improve the operability when the image reading device is rotated, a one-way hinge or the like is employed so that it is in a free state when rotating in the opening direction and a constant load is applied when rotating in the closing direction. is there.

JP 2008-152050 A (page 7, FIG. 11)

  However, further improvement in operability in the rotation region is required.

The present invention is a composite apparatus comprising a base and a rotating part that is rotatably held by the base in a predetermined rotation region,
A one-way hinge disposed on the base, a pinion gear that rotates integrally with a rotation shaft of the one-way hinge, and a pivot that is disposed on the pivot, wherein the pivot is a first rotation within the pivot region. A first rack gear that meshes with the pinion gear when rotating the moving region, and a second rack gear that is disposed on the rotating portion, and the rotating portion is different from the first rotating region in the rotating region. A second rack gear meshing with the pinion gear when rotating the rotation region of
The first rotation area and the second rotation area are provided continuously via a third rotation area where the pinion gear is free, and the rotation portion rotates in one direction. In this case, the rotation direction of the pinion gear is different between the first rotation area and the second rotation area.

  According to the present invention, it is possible to maintain good operability in the rotation range.

It is a front view of the compound apparatus of Embodiment 1 by the present invention. It is a left view of the compound apparatus of Embodiment 1 by the present invention. It is explanatory drawing which shows the state which the discharge medium mounting base 31 closed. Description showing a state in which the discharge medium mounting table is rotated in the opening direction until the center of gravity G of the integrated discharge medium mounting table, the left and right stays, the image reading device, and the finisher is positioned vertically above the rotation shaft. FIG. FIG. 3 is an exploded perspective view illustrating a configuration of a left side chassis disposed on the left side of the image forming apparatus main body, a periphery of a rotation shaft of a discharge medium placing table, and a left one-way hinge disposed on the left side chassis. It is the left view which looked at the rotating shaft periphery of the discharge | emission medium mounting base after an assembly seen from the left side. It is the side view which looked at the left rotating shaft and the left pinion gear which were integrally formed by the same axis | shaft from the left one-way hinge side. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow A from an opening angle of 0 ° to an opening angle of 90 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow A from an opening angle of 0 ° to an opening angle of 90 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow A from an opening angle of 0 ° to an opening angle of 90 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow A from an opening angle of 0 ° to an opening angle of 90 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow A from an opening angle of 0 ° to an opening angle of 90 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow B from an opening angle of 90 ° to an opening angle of 0 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow B from an opening angle of 90 ° to an opening angle of 0 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow B from an opening angle of 90 ° to an opening angle of 0 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow B from an opening angle of 90 ° to an opening angle of 0 °. FIG. 10 is a state explanatory diagram for explaining an operation when the discharge medium mounting table rotates in the direction of arrow B from an opening angle of 90 ° to an opening angle of 0 °.

Embodiment 1 FIG.
FIG. 1 is a front view of a composite apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a left side view thereof.

  As shown in these drawings, the composite apparatus 1 includes an image reading apparatus 11 and an image forming apparatus 21. For example, image information read by the image reading apparatus 11 is printed by the image forming apparatus 100. In the upper part of the image forming apparatus 21, a discharge medium mounting table 31 including a discharge medium mounting portion 31 a for mounting a print medium to be printed and discharged is disposed. As will be described later, the discharge medium mounting table 31 includes a rotation shaft 32 protruding left and right from the vicinity of the rear end portion, and is rotatably held by a main body 21 a of the image forming apparatus 21. Hereinafter, the image forming apparatus 21 other than the discharge medium mounting table 31 may be referred to as an image forming apparatus main body 21a.

  In addition, as described above, when the multifunction device 1 is viewed from the front shown in FIG. 1, the up / down / left / right and front / rear directions of the multifunction device 1 may be specified. Here, the vertical direction is the vertical direction. And

  The left stay 13 and the right stay 14 whose front and rear depths are shallower than those of the image forming apparatus 21 are arranged on the left and right sides of the upper surface of the discharge medium mounting table 31, and the rear ends thereof are aligned with the image forming apparatus 21. It is fixedly arranged along.

  The left and right stays 13 and 14 fixedly support the left and right side portions of the lower surface of the image reading device 11 placed on the upper surface thereof, whereby the discharge medium placing table 31 and the image reading device 11 are integrated. It is connected. Here, the image reading device 11 has a left-right width that is substantially the same as the image forming device 21, a front-rear depth that is substantially the same as the left and right stays 13, 14, and the left and right stays 13, 14 are aligned with the rear end. Be placed. The image reading apparatus 11 includes a document feeding unit 11a and an operation panel 11b extending obliquely downward at the front.

  A finisher 15 is fixedly disposed on the upper surface of the discharge medium mounting table 31 in a region surrounded by the left and right stays 13 and 14 and the image reading device 11. The finisher 15 executes a punching process and a stapling process on the print medium printed and discharged by the image forming apparatus 21 according to a user instruction, and the print medium processed on the medium placement unit 15a extending obliquely upward at the front. Is placed.

Accordingly, the discharge medium placing table 31, the left and right stays 13, 14, the image reading device 11, and the finisher 15 are integrally formed. As shown in FIGS. When rotating around 32, these rotate together. As will be described later, FIG. 3 shows a state in which the discharge medium mounting table 31 is closed, and FIG. 4 shows an integrated discharge medium mounting table 31, left and right stays 13, 14, the image reading device 11, and A state is shown in which the discharge medium mounting table 31 is rotated in the opening direction until the center of gravity G of the finisher 15 is positioned vertically above the rotation shaft 32.

  Here, the image forming apparatus main body 21a corresponds to the base, and the discharge medium mounting table 31, the left and right stays 13 and 14, the image reading device 11, and the finisher 15 that rotate integrally correspond to the rotation unit.

  FIG. 5 shows the configuration of the left side chassis 22a disposed on the left side of the image forming apparatus main body 21a, the periphery of the rotation shaft 32 of the discharge medium mounting table 31, and the left one-way hinge 25 disposed on the left side chassis 22a. FIG.

  In FIG. 5, the discharge medium mounting table 31 is supported by fitting the left end portion of the rotation shaft 32 into the shaft hole 23 formed in the left side chassis 22a disposed on the left side portion of the image forming apparatus main body 21a. Further, the right end portion of the rotation shaft 32 is fitted into and supported by a shaft hole 23 formed in the right side chassis 22a (not shown) disposed on the right side of the main body of the image forming apparatus 21, thereby forming an image. The apparatus main body 21a is rotatably held.

  Here, the left and right side chassis 22a, 22b (only 22a is shown) and the discharge medium mounting table 31 are configured to support the rotation and the configuration of a gear engagement mechanism, which will be described later, between the left and right side chassis 22a, 22b. Since the configuration is symmetrical with respect to the center plane (perpendicular to the rotation shaft 32), only the components on the left side are illustrated and described here.

  In FIG. 5, the left side chassis 22a, when assembled, holds the discharge medium mounting table 31 so that the rotation shaft 32 disposed at the rear end thereof can turn freely to the left and right. The left one-way hinge 25 is fixedly arranged with a screw at a predetermined position near 32.

  The left one-way hinge 25 has a left rotation shaft 26 that is fitted into the shaft hole 25a from the inside of the left side chassis 22a at the stage of assembly, and whose axial movement is restricted by the E ring, and extends to the inside of the left side chassis 22a. This left-side rotation shaft 26 is configured to generate a reverse torque in a direction to prevent rotation when rotating in the direction of arrow D while rotating in the direction of arrow D by obtaining rotational force from the outside. It has become.

  A left pinion gear 27 is integrally disposed on the left rotation shaft 26 so as to be coaxial with the inside of the left side chassis 22a. FIG. 7 is a side view of the left rotation shaft 26 and the left pinion gear 27 that are integrally formed coaxially and viewed from the left one-way hinge 25 side. As will be described later, the left rotation shaft 26 and the left pinion gear 27 are configured to rotate in the direction of the arrow C or the arrow D by obtaining a rotational force from the outside. When rotating in the direction of arrow D, reverse torque in the direction of preventing rotation is received.

  The discharge medium mounting table 31 has a first left rack gear 33a as a first rack gear and a second rack gear as a second rack gear meshing with the left pinion gear 27 on the inner surface (the surface that becomes the inner side when closed). A left rack portion 33 having a left rack gear 33b is fixedly disposed.

  FIG. 6 is a left side view of the periphery of the rotation shaft 32 of the discharge medium mounting table 31 after assembly as viewed from the left side. In order to clearly show the inside, the rotation shaft 32 is rotatably held and the left one-way is shown. The left side chassis 22a to which the hinge 25 is fixedly disposed is omitted.

  As shown in FIG. 6, the first left rack gear 33 a and the second left rack gear 34 a are respectively disposed when the discharge medium placing table 31 rotates about a predetermined rotation range around the rotation shaft 32 as will be described later. However, in a limited rotation range within the predetermined rotation range, they are selectively engaged with each other on the side different from the left pinion gear 27, and a rotational force in a different direction is applied to the left pinion gear 27. For this reason, the first left rack gear 33a and the second left rack gear 33b are formed along an arc centered on the rotation shaft 32, and the left pinion gear 27, the center of the rotation shaft 32, and the center of the left rotation shaft 26 are formed. On the connecting line, the meshes are individually engaged at opposing positions sandwiching the left rotation shaft 26.

  That is, the first left rack gear 33a is formed over the formation region W1 on the outer side (the side far from the rotation shaft 32) than the left pinion gear 27, and as will be described later, the discharge medium mounting table 31 is formed in the first rotation region (opening). The second left rack gear 33b is formed over the formation region W2 on the inner side (closer to the rotation shaft 32) than the left pinion gear 27 when rotating in the angular range), as will be described later. When the discharge medium mounting table 31 rotates in the second rotation region (open angle range), it engages with the left pinion gear 27.

  Therefore, for example, when the discharge medium placing table 31 rotates in one direction in the direction of arrow A, the left pinion gear 27 is in the direction of arrow C (FIG. 7) while meshing with the first left rack gear 33a in the first rotation region. While rotating and meshing with the second left rack gear 33b in the second rotation region, it rotates in the direction of arrow D (FIG. 7).

  Further, as will be described later, the left rack portion 33 has a left pinion gear 27 between the first left rack gear 33a and the second left rack gear 33b between the first rotation area and the second rotation area. The formation regions W1, W2 of the first left rack gear 33a and the second left rack gear 33b are set so that a third rotation region that does not mesh is generated.

  The left side chassis 22a disposed on the left side of the image forming apparatus main body 21a, the left one-way hinge 25, the left rotation shaft 26, the left pinion gear 27, the first left rack gear 33a, the second left rack gear 33b, and the left rack portion. 33, the right side chassis 22b (not shown), the right one-way hinge 25 ', the right rotation shaft 26', the right pinion gear 27 ', the first right rack gear 33a', As described above, the two right rack gears 33b 'and the right rack portion 33' are formed symmetrically and configured similarly.

  8 to 12, the discharge medium mounting table 31 is opened to the maximum corresponding to the open position as shown in FIG. 12 from the opening angle of 0 ° when the discharge medium mounting table 31 is closed corresponding to the closed position as shown in FIG. 8. It is state explanatory drawing which shows each meshing state of the left pinion gear 27 and the 1st left rack gear 33a or the 2nd left rack gear 33b at the time of rotating to the arrow A direction opened to 90 degree of opening angle. First, the operation when the discharge medium mounting table 31 rotates in the opening direction (arrow A direction) will be described with reference to FIGS.

  8 to 12, the left side chassis 22a in which the rotation shaft 32 is rotatably held and the left one-way hinge 25 is fixedly disposed is omitted in order to clearly show the inside. Further, for the sake of simplicity, the image reading device 11 and the finisher 15 that are disposed integrally with the discharge medium mounting table 31 are also omitted. Therefore, here, the discharge medium mounting table 31 may be referred to as a rotating unit including the discharge medium mounting table 31, the left and right stays 13 and 14, the image reading device 11, and the finisher 15.

  As shown in FIG. 8, when the discharge medium mounting table 31 (rotating unit) is closed at an opening angle of 0 °, the left pinion gear 27 and the first left rack gear 33a are separated from each other, and the direction of opening from this closed position is shown. When the discharge medium mounting table 31 (rotation unit) rotates in the direction of arrow A, the left pinion gear 27 and the first left rack gear 33a first mesh with each other when the opening angle θ1 is reached. FIG. 9 shows a state in which the left pinion gear 27 and the first left rack gear 33a are meshed at a position where the opening angle slightly exceeds θ1 (θ1 + α1).

  Further, when the discharge medium placing table 31 (rotating part) is rotated in the opening direction (arrow A direction), the left pinion gear 27 and the first left rack gear 33a are separated from each other when the opening angle θ2 is reached, as shown in FIG. Thus, when the opening angle θ4 is reached, the left pinion gear 27 and the second left rack gear 33b mesh with each other, and this meshing state is maintained up to an opening angle of 90 ° when opened to the maximum as shown in FIG.

  Here, the discharge medium placing table 31 (rotating part) is configured to be regulated by a regulating means (not shown) so as not to open at an opening angle of 90 ° or more which is the open position, but the opening which is the open position is configured. The degree is appropriately set.

  FIG. 10 shows that the discharge medium mounting table 31 (rotating unit) is at an opening angle θ3 that is an intermediate position between the opening angle θ2 and the opening angle θ4, and the left pinion gear 27 is connected to the first left rack gear 33a and the second left rack gear. 33b shows a separated state. Further, here, when the discharge medium mounting table 31 (rotating part) is at the opening angle θ3, the center of gravity G of the integrated rotating part is vertically above the rotating shaft 32 as shown in FIG. It is comprised so that it may be located in.

Therefore, the relationship between the open angles θ1, θ2, θ3, and θ4 here is 0 ° <θ1 <θ2 <θ3 <θ4 <90 °.
θ3 = θ2 + (θ4-θ2) / 2,
θ1 ≦ first rotation region ≦ θ2
θ2 <third rotation region <θ4
θ4 ≦ second rotation region ≦ 90 °
It becomes.
Further, as described above, the left pinion gear 27 rotates idly when rotating in the direction of arrow C, and receives reverse torque in a direction that prevents rotation when rotating in the direction of arrow D.

  Therefore, when the operator opens the discharge medium mounting table 31 (rotation unit) in the closed state at 0 ° as shown in FIG. In the first rotation region of θ2, for example, as shown in FIG. 9, the left pinion gear 27 and the first left rack gear 33a mesh with each other and the left pinion gear 27 rotates in the idling state in the direction of arrow C. The discharge medium mounting table 31 (rotating part) can be rotated without receiving a rotational load by the hinge 25 (FIG. 5).

  When the discharge medium mounting table 31 (rotation unit) is in a third rotation region with an opening angle θ2 to θ4, for example, a rotation position with an opening angle θ3 shown in FIG. 10, the left pinion gear 27 is moved to the first left rack gear. Since it is separated from both 33a and the second left rack gear 33b, it is not affected by the left one-way hinge 25. However, in the third rotation region, the center of gravity G (FIG. 4) of the rotation unit is in the vicinity of the upper vertical portion of the rotation shaft 32 as described above, so that the weight of the rotation unit including the discharge medium mounting table 31 is reduced. Therefore, the turning operation by the operator is small and the turning operation by the operator is easy.

  When the operator further opens and opens the discharge medium mounting table 31 (rotation unit) in the direction of arrow A, in the second rotation region having an opening angle θ4 to 90 °, for example, FIG. 12, the left pinion gear 27 and the second left rack gear 33b mesh with each other and the left pinion gear 27 rotates in the direction of arrow D. During this time, the left pinion gear 27 is rotated by the left one-way hinge 25 (FIG. 5). The reverse torque generated in the blocking direction is received.

  At this time, the reverse torque generated by the left one-way hinge 25 (FIG. 5) is such that the discharge medium placing table 31 (rotating part) exceeds the center of gravity G of the rotating part vertically above the rotating shaft 32 (FIG. 4). When rotating in the direction of opening the second rotation region (arrow A direction), the rotation speed that increases due to its own weight is set to prevent, for example, an increase beyond necessity.

  13 to 17, the discharge medium mounting table 31 is closed corresponding to the closed position as shown in FIG. 17 from the opening angle of 90 ° when the maximum is opened corresponding to the open position as shown in FIG. 13. It is a state explanatory drawing which shows each meshing state of the left pinion gear 27 and the 1st left rack gear 33a or the 2nd left rack gear 33b at the time of rotating to the close direction to the opening angle of 0 degree. Next, the operation when the discharge medium mounting table 31 rotates in the closing direction (arrow B direction) will be described with reference to FIGS.

  13 to 17, the left side chassis 22 a is omitted, and the image reading device 11 and the finisher 15 that are disposed integrally with the discharge medium mounting table 31 are also omitted, as in FIGS. 8 to 12. Yes. Accordingly, the discharge medium mounting table 31 may be referred to as a rotating unit including the discharge medium mounting table 31, the left and right stays 13 and 14, the image reading device 11, and the finisher 15.

  As shown in FIG. 13, when the operator closes the discharge medium mounting table 31 (rotating unit) that is fully opened at an opening angle of 90 ° by rotating it in the direction of arrow B, the opening angle is 90 °. In the second rotation region of .about..theta.4 (see FIG. 11), for example, as shown in FIG. 13, the left pinion gear 27 and the second left rack gear 33b mesh and the left pinion gear 27 is idled in the direction of arrow C. Since it rotates, the discharge medium mounting table 31 (rotating part) can be rotated almost without receiving a rotational load by the left one-way hinge 25 (FIG. 5).

  When the operator further rotates and closes the discharge medium mounting table 31 in the direction of arrow B, for example, as shown in FIG. 14, the opening angle θ4 that is easy to rotate without being affected by the left one-way hinge 25. In the first rotation region of the opening angles θ2 to θ1 that has passed through the third rotation region of ~ θ2 (including the opening angle θ3), for example, as shown in FIGS. 15 and 16, the left pinion gear 27 and the first left The left pinion gear 27 rotates in the direction of arrow D by meshing with the rack gear 33a. During this time, the left pinion gear 27 receives reverse torque generated in the direction of preventing rotation by the left one-way hinge 25 (FIG. 5). become.

  At this time, the reverse torque generated by the left one-way hinge 25 (FIG. 5) is such that the discharge medium placing table 31 (rotating part) exceeds the center of gravity G of the rotating part vertically above the rotating shaft 32 (FIG. 4). Further, when the first rotation area is rotated in the closing direction, the rotation speed increased by its own weight is prevented from increasing more than necessary.

  Eventually, when the opening angle of the discharge medium mounting table 31 (rotating unit) becomes equal to or less than θ1 close to 0 °, the left pinion gear 27 and the first left rack gear 33a are separated from each other, and therefore the reverse torque by the left one-way hinge 25 is applied. Although not received, it immediately reaches the closed position with an opening angle of 0 ° shown in FIG. 17, so that the rotational speed does not increase more than necessary. Further, by this separation, the bending stress generated in the discharge medium placing table 31 by the reverse torque can be suppressed, and the occurrence of creep deformation can be prevented.

  In addition, the discharge medium mounting table 31 (rotating unit) is not affected by the left pinion gear 27 that communicates with the left one-way hinge 25 in the closed state with an opening angle of 0 °, and thus avoids the disadvantage of floating. it can.

  The operations of the left side chassis 22a disposed on the left side of the image forming apparatus 21, the left one-way hinge 25, the left rotation shaft 26, the left pinion gear 27, the first left rack gear 33a, and the second left rack gear 33b have been described. However, the right side chassis 22b (not shown) formed in plane symmetry as described above, the right one-way hinge 25 ', the right rotation shaft 26', the right pinion gear 27 ', and the first right side are also formed on the right side of the image forming apparatus 21. The rack gear 33a 'and the second right rack gear 33b' operate similarly.

  Further, here, the first left rack gear 33a formed outside the left pinion gear 27 in the first rotation region meshes with the left pinion gear 27, and is formed inside the left pinion gear 27 in the second rotation region. The second left rack gear 33b is formed to mesh with the left pinion gear 27. However, the present invention is not limited to this, and the rack gear formed on the inner side of the left pinion gear 27 in the first rotation region is A rack gear that meshes with the pinion gear 27 and is formed outside the left pinion gear 27 in the second rotation region may mesh with the left pinion gear 27.

  However, in this case, the left one-way hinge 25 rotates in the direction in which the left rotation shaft 26 rotates idly when the left rotation shaft 26 obtains rotational force from the outside and rotates in the direction of arrow D, and prevents rotation when rotated in the direction of arrow C. The reverse torque is generated.

  As described above, according to the composite device of the present embodiment, in the case where the center of gravity straddles the vertical upper side of the rotation axis while the rotation unit rotates between the closed position and the open position, In either direction, it is possible to suppress an increase in the rotation speed more than necessary only in a rotation area where the rotation speed tends to increase due to its own weight. Therefore, good operability can be obtained in the rotation range. Moreover, since the suppression action is completed by a mechanism using one one-way hinge, it can contribute to simplification of the configuration and cost reduction.

  In the first embodiment described above, an example in which the present invention is applied to a composite apparatus including an image forming apparatus and an image reading apparatus has been described. However, the present invention is not limited to this. It is also applicable to.

  DESCRIPTION OF SYMBOLS 1 Composite apparatus, 11 Image reading apparatus, 11a Document feeding unit, 11b Operation panel, 13 Left stay, 14 Right stay, 15 Finisher, 15a Medium mounting part, 21 Image forming apparatus, 21a Image forming apparatus main body, 22a Left side chassis , 23 shaft hole, 25 left one-way hinge, 25a shaft hole, 26 left rotation shaft, 27 left pinion gear, 31 discharge medium mounting table, 31a discharge medium mounting part, 32 rotating shaft, 33 left rack part, 33a first left Rack gear, 33b Second left rack gear.

Claims (9)

In a composite apparatus comprising a base and a rotating part that is rotatably held by the base in a predetermined rotation region,
A one-way hinge disposed on the base;
A pinion gear that rotates integrally with the rotation shaft of the one-way hinge;
A first rack gear that is disposed in the rotating portion and meshes with the pinion gear when the rotating portion rotates in a first rotating region in the rotating region;
A second rack gear that is disposed in the rotating portion and meshes with the pinion gear when the rotating portion rotates in a second rotation area different from the first rotation area in the rotation area. And
The first rotation area and the second rotation area are provided continuously via a third rotation area where the pinion gear is free,
The composite apparatus, wherein the rotation direction of the pinion gear is different between the first rotation area and the second rotation area when the rotation portion rotates in one direction.   2. The composite apparatus according to claim 1, wherein when the rotating part is in the third rotating area, the center of gravity of the rotating part is positioned substantially vertically above the rotating shaft of the rotating part. .   When the rotating portion rotates from the first rotation area toward the second rotation area, the pinion gear rotates in the direction in which the one-way hinge is idled in the first rotation area. 3. The composite apparatus according to claim 1, wherein the one-way hinge rotates in a direction in which a reverse torque is generated in the second rotation region.   The first rack gear and the second rack gear are individually meshed with each other at positions facing each other across the rotation shaft on a line connecting the pinion gear and the respective shaft centers of the rotation shaft and the rotation shaft. The composite apparatus according to claim 1, wherein:   The base portion corresponds to an apparatus main body of an image forming apparatus that forms an image on a medium, and the rotating portion is disposed integrally with the discharge medium mounting table and the discharge medium mounting table of the image forming apparatus. The composite apparatus according to claim 1, further comprising an image reading apparatus that reads the image.   The composite apparatus according to claim 5, wherein the rotating unit includes a finisher integrally disposed on the discharge medium mounting table.   The rotating part rotates between a closed position with an opening angle of 0 ° for closing the upper part of the apparatus main body and an open position with a predetermined opening angle for opening the upper part of the apparatus main body. Item 7. The composite device according to Item 5 or 6.   The composite apparatus according to claim 7, wherein an opening angle at the open position is about 90 °. 9. The composite apparatus according to claim 7, wherein the pinion gear is free when the rotating portion is in the closed position.

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