JPH07209943A - Image forming device - Google Patents

Abstract

PURPOSE:To provide an image forming device where jammed paper is easily removed and also a high quality image is obtained by accurately positioning a photoreceptor and an optical system device with a simple constitution. CONSTITUTION:A printer main body 10 is divided into a lower main body 10b and an upper main body 10a capable of opening upward with respect to the main body 10b and a positioning frame 18 supporting the photoreceptor 4 and a developing device 7 is supported by the lower main body 10b, and the positioning frame 18 is press-contacted with the optical system device 6 by a spring 50 provided between the lower main body 10b and the positioning frame 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower body, an upper body rotatably supported so as to be opened upward with respect to the lower body, and a latent image on which an electrostatic latent image is formed. A carrier,
An optical system device for forming an electrostatic latent image on the latent image carrier, and a developing device for visualizing the electrostatic latent image,
The present invention relates to an image forming device that transfers a visible image formed on the latent image carrier to a recording paper conveyed from a paper feeding device, and fixes the transferred visible image on the recording paper by a fixing device.

[0002]

2. Description of the Related Art An image forming apparatus of the type described above, which is configured as a copying machine, a printer, a facsimile or the like, has been well known in the art. In a conventional image forming apparatus of this type, when the recording paper is jammed in the paper path below the developing device or the latent image carrier, the developing device or the latent image carrier is installed so that the jammed paper can be removed. It is constructed so that it can be pulled out by sliding it toward the front side of the image forming apparatus main body.

However, when the developing device and the latent image carrier are pulled out toward the front side in this way, the jammed paper exists in the paper path below the jammed paper, so that the developing device and the latent image carrier interfere with the jammed paper. It may be difficult to pull them out.
Further, if the latent image carrier strongly hits the jammed paper, the latent image carrier may be damaged. Further, if the developing device and the latent image carrier are configured to be pulled out to the front side of the image forming device main body, it is necessary to secure a space at the front side of the image forming device when the developing device and the latent image bearing member are pulled out. Therefore, the substantial installation space of the image forming apparatus becomes large, and there arises a problem that the image forming apparatus cannot be placed in a narrow place.

Further, as described above, in order to treat the jammed paper, the developing device and the latent image carrier are pulled out to the front side of the main body of the image forming apparatus to remove the jammed paper. It is necessary to remove the jammed paper from the front side of the device body by inserting a hand inside the device body. In this way, even if the developing device and the latent image carrier are pulled out to the front side, the work of processing the jammed paper is very troublesome and complicated.

Further, if the relative position between the latent image carrier and the optical system device becomes inaccurate, the quality of the image formed on the latent image carrier deteriorates. Therefore, conventionally, the expensive position means for determining the relative position of the both is used to correctly set the position of the optical system device with respect to the latent image carrier, but if such an expensive positioning means is used, There is an inevitable drawback that the cost of the entire image forming apparatus increases.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus which eliminates all the above-mentioned conventional drawbacks.

[0007]

In order to achieve the above object, the present invention provides an image forming apparatus of the type described at the beginning,
Conveyance of recording paper supported by the lower body and conveyed below the lower body so as to remain in the lower body with the upper body being opened upward while supporting the latent image carrier and the developing device. A positioning frame that constitutes a guide is provided, the positioning frame is supported so as to be movable upward with respect to the lower body, and the optical system device is supported on the upper body side. An elastic member for urging the positioning frame upward is interposed between the positioning frame and the lower body so that the positioning frame is pressed against a part of the optical system device when closed to the lower body. Proposes the configuration.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a laser printer as an example of an image forming apparatus. In this laser printer, the image forming apparatus main body, that is, the printer main body 10 is the lower main body 10b.
The upper body 10a is divided into two parts, the upper body 10a and the upper body 10a, and the upper body 10a can be opened and closed with respect to the lower body 10b around a hinge (not shown) provided on the back side thereof as shown in FIG. . In this way, laser printers
Lower body 10b and upper body 10 rotatably supported with respect to the lower body 10b so as to open upward.
a.

In FIG. 1, a recording paper 2 fed from a paper feeding device 1 in the direction of arrow A is conveyed by a registration roller pair 3 to a latent image carrier composed of a photosensitive drum 4 in a timing manner. . The photoconductor 4 is driven to rotate clockwise in FIG. 1, and at that time, the surface of the photoconductor 4 is charged by the charging charger 5 and is supported by the upper main body 10a.
Is irradiated with laser light L to form an electrostatic latent image on the photoconductor 4. This latent image is visualized by the toner as it passes through the developing device 7, and this visible image is transferred to the recording paper conveyed to the photoconductor 4 by the action of the transfer charger 8 and is visible on the transferred recording paper. The image is fixed by the fixing device 9. The recording paper exiting the fixing device 9 is discharged to a paper discharge unit 11 formed by the upper wall surface of the printer body 10 as indicated by an arrow B.

As described above, the illustrated laser printer has the photoconductor 4 on which an electrostatic latent image is formed, the optical system device 6 for forming the electrostatic latent image on the photoconductor 4, and the electrostatic latent image. And a developing device 7 for converting the image into a visible image. The visible image formed on the photoconductor 4 is transferred onto the recording paper 2 conveyed from the paper feeding device 1, and the transferred visible image is transferred. It is fixed on the recording paper 2 by the fixing device 9.

On the other hand, the photosensitive member after the transfer of the visible image is removed of residual toner by the cleaning device having the cleaning blade 12, and is subjected to the static elimination action by the static elimination brush 13. The toner removed from the photoconductor 4 is collected in the toner collection chamber 15 by the impeller 14 and stored therein.

In the laser printer shown in FIG. 1,
The latent image carrier composed of the photoconductor 4 and the parts related thereto are configured as one carrier unit 16, and the developing device 7
Is also configured as one developing unit 17, and these units 16 and 17 are separately and detachably supported by the positioning frame 18, respectively. As described above, the laser printer has the positioning frame 18 that supports the photoconductor 4 and the developing device 7.

As shown in FIG. 2, the carrier unit 16 has a box-shaped case 19, and the support shaft 4a of the photosensitive member 4 is rotatably supported by the case 19. The case 19 has a hole 2 through which the laser light from the laser optical system 6 enters.
0 is formed, and the toner recovery chamber 15 described above is partitioned by the case 19 itself. Furthermore, this case 1
A charging charger 5, a charge removing brush 13, an impeller 14, and a cleaning blade 12 are supported by the reference numeral 9, respectively, and these constitute a carrier unit 16.

Further, as is apparent from FIG. 1, the developing device 7 includes a developing tank 21 containing the toner T, a developing roller 22 opposed to the photoconductor 4, and a regulating blade for regulating the layer thickness of the toner on the developing roller. 24, a supply roller 23 that supplies toner to the developing roller 22, and an agitator 62 that agitates the toner T in the tank 21, and the support shaft 22a of the developing roller 22 is rotatable in the tank 21 as shown in FIG. It is supported, and the supply roller 23 and the agitator 62 are also rotatably supported by the tank 21. Also the regulation blade 2
4 also has one end fixed to the tank 21. Further, a toner cartridge 25 is detachably attached to the developing tank 21, and the developing unit 17 is constituted by the cartridge 25 and the developing device 7.

The carrier unit may be composed of only the latent image carrier and a member for supporting the latent image carrier, or conversely, the carrier unit may be structured by adding parts more than in the case of FIG. The same applies to the developing unit, and a developing unit having at least a developing device may be used.

Positioning frame 1 shown as an example in the drawing
8 is formed in a box shape having an opening at the top and a bottom wall, and is supported by the lower main body 10b of the printer main body 10 in a manner described later. In addition, the positioning frame 18
Has a pair of positioning members 26 fixed to its bottom wall as shown in FIG.
A notch 27 that supports the support shaft 4a of the photoconductor 4 and a notch 28 that supports the support shaft 22a of the developing roller 22 are formed. By fitting the support shafts 4a and 22a into the notches 27 and 28, respectively, The photoconductor 4, that is, the carrier unit 16, and the developing device 7, that is, the developing unit 17, can be properly positioned and supported by the positioning frame 18.

In this case, a pair of notches 2 for the developing unit
The width of 8 is formed to be slightly larger than the diameter of the support shaft 22a of the developing roller 22, and when the support shaft 22a is fitted into the notches 28, the positioning frame 18 and the developing unit 1
A spring 29 disposed between the support shaft 22a and the spring 7 presses the developing unit 17 to the left in FIG.
It is pressed against one side surface as shown in FIG. For this reason, when the developing roller 22 and the photoconductor 4 are opposed to each other with a predetermined small gap, the gap is made constant along the axial direction of the photoconductor, and the surface of the developing roller 22 is elastically deformable. When the photosensitive member 4 is pressed against the photosensitive member 4 while elastically deforming, the pressing force is applied to the developing roller 22.
Can be made uniform in the axial direction.

As described above, the photoconductor 4 and the developing device 7
Is a positioning frame 1 arranged in the printer body 10.
8 is supported.

As described above, the printer main body 10 is divided into the upper main body 10a and the lower main body 10b. At this time, the positioning frame 18 is supported by the lower main body 10b, and the photoconductor 4 is attached to the positioning frame 18. And the developing device 7 is supported as described above. Therefore, when the upper main body 10a is opened as shown in FIG. 3, the positioning frame 18 is left on the lower main body 10b, the upper portions of both units 16 and 17 are exposed, and if the units 16 and 17 are lifted up in this state, Each of the support shafts 4a and 22a has a positioning member 26.
After being removed from the notches 27 and 28, both units, that is, the photoconductor 4 and the developing device 7, can be easily removed from the printer body 10. When installing the units 16 and 17,
On the contrary, it is only necessary to lower these from above and fit the support shafts 4a and 22a into the notches 27 and 28. At this time, the lower main body 10b of the printer main body 10 and the positioning frame 1
8 is horizontal, so the operator
The attachment and detachment work of 6, 17 can be performed in a comfortable posture.

As mentioned above, the positioning frame 18 is
The upper main body 10a is supported by the lower main body 10b so as to be left in the lower main body 10b in a state where the upper main body 10a is opened upward, and the developing device 7 is removably supported in the upper direction with respect to the positioning frame 18. ing. Moreover, the positioning frame 18 is opened at the top so that the developing device 7 and the photoconductor 4 can be removed upwardly from the positioning frame 18, and the bottom wall of the positioning frame 18 is supported by the developing frame 18. An opening 30 is formed so as to cover the lower side of the device 7 and at the bottom wall portion facing the photoconductor 4.

As described above, in the laser printer of this embodiment, when removing the developing device 7 and the photoconductor 4 for the purpose of exchanging the developing device 7 and the photoconductor 4, the developing device 7 and the photoconductor 4 are simply lifted upward. Of course, it is not necessary to pull out the developing device and the photoconductor to the front side with respect to the image forming apparatus main body. Therefore, when the developing device 7 and the photoconductor 4 are attached and detached, even if the jammed paper exists in the paper path below the photoconductor 4, the photoconductor 4 strongly hits the jammed paper and is damaged.
There is no problem that the developing device 7 interferes with the jammed paper and makes it difficult to attach and detach it. Further, since the developing device 7 can be attached and detached while being kept horizontal and it is not necessary to incline the developing device 7 obliquely, the detachability can be improved and the toner can be prevented from scattering. Moreover, even if the toner is scattered during the attachment / detachment and falls downward, the bottom wall of the positioning frame 18 is located below the toner, so that the toner is received by the bottom wall and falls into the paper path. There is no such thing. Therefore, it is possible to prevent the problem that the recording paper is soiled by the toner. Further, since the developing device 7 and the photoconductor 4 are vertically attached and detached, it is not necessary to secure a large space in front of the printer body 10.
The substantial installation space of the laser printer can be reduced.

If the units 16 and 17 are supported by the upper main body 10a, when the upper main body 10a is opened, it tilts with respect to the horizontal direction.
Although it is necessary to attach and detach 6 and 17 in a tilted state, the workability is deteriorated. However, the laser printer of this example can eliminate such a defect.

If the carrier unit 16 is provided with a handle 60 as shown in FIG. 2, it is convenient because the handle 60 can be gripped for the attachment / detachment work. Similarly, the developing unit 17 can be provided with a handle.

The carrier unit 16 is attached to the positioning frame 1
When supported by 8, a part of the photoconductor 4 projects into the opening 30 formed in the bottom wall of the positioning frame 18, and the gear 31 attached to the support shaft 4a projects into the hole 32 in the frame bottom wall. It meshes with a gear (not shown) supported on the printer body side. The gear 31 also meshes with an intermediate gear 33 that is rotatably supported by the positioning frame 18, and another intermediate gear 34 that is also supported by the positioning frame 18 is used.
Meshes with a gear (not shown) on the developing unit side, and rotation of the gear on the printer body side causes the photoconductor 4 and the developing roller 2 to rotate.
2, to the supply roller 23, the agitator 62, etc.
In this way, the gears on the units 16 and 17 side engage or disengage from the gears on the printer body 10 side and the frame 18 side when the units are attached and detached. In this example, the units 16 and 17 are moved up and down. The gears can be easily attached and detached, so that the gears can be easily engaged with each other. When the units 16 and 17 are slid in the horizontal direction for this attachment / detachment, it is difficult to engage the gears with each other, and it is inevitable that the work is troublesome. Further, since the opening 30 is formed in the bottom wall of the positioning frame 18 at a position facing the photoconductor 4, it is possible to
The visible image on the photoconductor 4 can be transferred onto the recording paper without any trouble.

Further, in this example, the carrier unit 16 and the developing unit 17 are separately supported by the positioning frame 18, so that it is not always necessary to attach and detach both units integrally, and for example, the photoreceptor 4 deteriorates. When this is to be replaced, the developing unit 17 can be left attached, and only the carrier unit 16 can be replaced. Even the fully usable developing device 7 is replaced, which is uneconomical. I don't need it. Further, even when a plurality of developing devices accommodating toners of different colors are prepared and the developing device for a desired toner is selected and used, the developing unit 17 only needs to be replaced, and the carrier need not be replaced. There is no need to perform wasteful work such as replacing the body unit 16 as well. Therefore, it suffices to prepare only a developing unit containing toners of different colors.

Toner cartridge 2 of developing unit 17
As shown in FIG. 2, projecting pieces 134 are attached to the cartridge 5, and these are engaged with the mounting engaging portions 35 of the tank 21 to mount the cartridge 25 on the tank 21. Tank 21
When it is necessary to replenish the inside of the toner, the projecting piece 134 of the cartridge 25 is removed from the mounting engagement portion 35, and the projecting piece 134 of the new toner cartridge is attached to the engagement portion 3 of the tank 21.
Attach and engage with 5. New toner cartridge 25
1 has a seal 36 attached thereto as indicated by a chain line in FIG. 1, and toner is contained therein. By pulling the seal 36 in a direction perpendicular to the paper surface of FIG. The toner stored in is dropped into the tank 21 to replenish the toner. Although the toner can be replenished in this manner, the developing device is supported horizontally by the positioning frame 18 even during this replenishment work, and therefore this work can be easily performed.

As described above, the recording paper passes under the positioning frame 18, but in the illustrated laser printer, attention is paid to this point, and the positioning frame 18 is
It constitutes a conveyance guide for recording paper conveyed below it. In this example, as shown in FIGS. 1 and 4, a plurality of ribs 39 are provided on the lower surface of the positioning frame 18 to form an upper guide of the recording paper, and the positioning frame 1
8 constitutes a part of the recording paper conveyance guide.

In this way, the other independent guide member located below the positioning frame 18 can be omitted, which has the advantage of reducing the number of parts. Moreover, as described later, the positioning frame 1
When 8 is rotated and lifted, the jammed paper can be immediately approached, and an advantage that jam paper can be easily processed is also obtained.

Further, a separating claw 40 is formed in a portion of the positioning frame 18 which is close to the photoconductor 4, and the recording paper wound around the photoconductor 4 can be separated by this. That is, the separation claw 40 for preventing the recording paper 2 from winding around the latent image carrier composed of the photoconductor 4 is formed in a part of the positioning frame 18. As a result, an independent separating claw can be omitted, and the number of parts and cost can be reduced. However, it goes without saying that the separation claw, which is a separate member, may be fixed to the positioning frame 18.

Here, the positioning frame 18 has an engaging groove 37 formed at the left end in FIG.
Is engaged with a pin 38 fixed to the lower main body 10b, and the positioning frame 18 can rotate about the pin 38.

When the upper main body 10a is opened as shown in FIG. 5, the positioning frame 18 can be rotated together with both units 16 and 17 around the pin 38 as shown by an arrow C, and the paper below the positioning frame 18 can be rotated. The recording paper jammed in the passage can be easily removed. in this way,
The positioning frame 18 is supported so as to be movable upward with respect to the lower body 10b.

As described above, in the conventional image forming apparatus of this type, when the recording paper is jammed, the developing device and the photoconductor are slid to the front side of the image forming apparatus main body to process the jammed paper. However, when the paper was pulled out, the jammed paper jammed against the photoconductor and rubbed against it, which could scratch the photoconductor. Further, the jammed paper interferes with the photoconductor and the developing device, making it difficult to pull out the jammed paper. On the other hand, in the configuration of the illustrated embodiment, the positioning frame 18 is moved upward, and the developing device 7, the photoconductor 4 and the like are lifted to treat the jammed paper. Therefore, the jammed recording paper damages the photoconductor 4. The paper path can be opened easily without being attached.

As described above, since the bottom wall of the positioning frame 18 is located below the developing device 7 in this example, even if the toner is scattered from the developing device 7,
It does not fall into the paper path. In addition, even when processing jammed paper, the developing device 7 and the photoconductor 4 are connected to the printer main body 1
Since it is not necessary to pull it out to the front side of 0, it is not necessary to secure a large space on the front side of the printer.

Further, since the developing device 7 and the photoconductor 4 are moved upward together with the positioning frame 18 to open the upper part of the paper passage and the jammed paper can be processed, the conventional operation is performed from the front side of the image forming apparatus main body. The workability can be significantly improved as compared with the case where the jam paper is processed by inserting the paper.

Further, the developing unit 17 and the carrier unit 1
6 are separately configured, but the positioning frame 18
Since both units rotate together with the rotation of, there is no need to lift each unit, and the work can be simplified. Providing the handle 61 on the positioning frame 18 is also advantageous because the turning operation can be performed easily.

As can be seen from the above description, the recording paper 2 conveyed from the paper feeding device 1 passes through the photoconductor 4 and is then positioned on the opposite side of the paper feeding device 1 with respect to the photoconductor 4. Paper feeding device 1 so that it passes through the fixing device 9
Although the photoconductor 4 and the fixing device 9 are arranged, the positioning frame 18 is rotatably in the upper part at the above-mentioned pin 38, that is, the end on the fixing device 9 side as a fulcrum. It is supported by the main body 10b.

Generally, the recording paper is apt to jam in the area of the fixing device 9 or the transfer charger 8. When the recording sheet is jammed at such a portion, the rear end portion is located on the side of the sheet feeding device 1. In order to remove the jammed paper, the positioning frame 18 is fixed to the pin 38 as described above.
When it is rotated about, the part on the side opposite to the fixing device 9 is largely opened upward. Therefore, the rear end of the jammed recording paper is located on the side that is largely opened, and the operator can easily grasp the rear end by hand and pull it out. Thus, the jammed paper can be processed only by rotating the frame 18 without removing the positioning frame 18 from the lower body 10b.

When the positioning frame 18 is rotatable about the side of the sheet feeding device 1 as a fulcrum, as described above, when the recording sheet is jammed at the fixing device 9 and the transfer charger 8, the positioning is performed. Even if the frame is rotated, the rear end of the recording paper is located on the fulcrum side of the positioning frame, that is, on the side that is not largely opened, so that it is difficult to grip the rear end. Therefore, if the user grasps the front end of the jammed recording paper by hand and pulls it toward the downstream side of the fixing device 9 in the recording paper conveyance direction, the unfixed toner on the recording paper passes through the fixing device 9. In this case, the unfixed toner adheres to the fixing roller whose temperature has dropped. The illustrated laser printer can avoid all such problems.

A foot member 49 is provided below the positioning frame 18 to support the positioning frame 18 on the lower body 10b, and a frame portion opposite to the foot member is provided with a spring 50 provided on the lower body 10b. And the frame 18 is urged upward by the action of the spring 50.
(FIG. 2) is an optical system device 6 supported by the upper main body 10a.
When pressed against the case or the like, the position of the photoconductor 4 with respect to the optical system device 6 can be correctly determined, and the occurrence of image defects can be prevented.

That is, the optical system device 6 is attached to the upper main body 10a.
When the upper main body 10a is closed to the lower main body 10b as shown in FIG.
An elastic member for urging the positioning frame 18 upward is interposed between the positioning frame 18 and the lower main body 10b so that a part of the above is pressed against a part of the optical system device 6.
As a result, when the upper main body 10a is closed, the relative position between the photoconductor 4 and the optical system device 6 can be automatically determined correctly, and thus the occurrence of image defects can be prevented. Since the photoconductor 4 and the optical system device 6 can be positioned by such simple positioning means, the cost of the laser printer can be surely reduced.

The present invention can be applied to various image forming apparatuses other than the laser printer, and can be widely applied to an image forming apparatus using a belt-shaped latent image carrier.

[0043]

According to the present invention, there is provided a recording paper conveyance guide which is supported by the lower main body and is conveyed below the lower main body so that the upper main body is left open in the upper direction. The latent image carrier and the developing device are supported by the positioning frame, and the positioning frame is supported so as to be movable upward with respect to the lower body. When the recording paper is jammed, the positioning frame can be moved upward to open the paper passage, and thus the jammed paper can be easily processed. It is not necessary to insert the hand from the front side to the back side of the image forming apparatus main body to treat the jammed paper as in the conventional case.

Further, it is not necessary to pull out the developing device and the latent image carrier to the front side of the image forming apparatus main body when processing the jammed paper.
Since it is only necessary to move the positioning frame upwards,
The latent image carrier does not hit the jammed paper strongly and the latent image carrier is not scratched. Further, since the latent image carrier and the developing device do not hit the jammed paper strongly, the positioning frame can be easily moved upward.

Further, since it is not necessary to pull out the latent image carrier and the developing device to the front side of the image forming device main body when processing the jammed paper, the latent image carrier and the developing device are pulled out to the front side of the image forming device main body. There is no need to reserve a large space for
This can reduce the substantial installation space of the image forming device.

Further, the optical system device is supported on the side of the upper body, and when the upper body is closed with respect to the lower body,
An elastic member for urging the positioning frame upward is provided between the positioning frame and the lower main body so that a part of the positioning frame is pressed against a part of the optical system device. The body and the optical system device can be correctly positioned, and the cost of the image forming device can be reduced. Moreover, by closing the upper body, the latent image carrier and the optical system device can be automatically positioned.

[Brief description of drawings]

FIG. 1 is a sectional view of a laser printer.

FIG. 2 is a perspective view showing a developing unit and a carrier unit separated from a positioning frame.

FIG. 3 is a perspective view showing a state in which an upper main body is opened.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view showing a state in which the upper main body is opened and the positioning frame is further rotated upward.

[Explanation of symbols]

 1 Paper Feeding Device 2 Recording Paper 6 Optical System Device 7 Developing Device 9 Fixing Device 10a Upper Body 10b Lower Body 18 Positioning Frame

Claims (2)

[Claims] 1. A lower main body, and an upper main body rotatably supported so as to open upward with respect to the lower main body,
A latent image carrier on which an electrostatic latent image is formed, an optical system device for forming an electrostatic latent image on the latent image carrier, and a developing device for visualizing the electrostatic latent image. In the image forming device, the visible image formed on the latent image carrier is transferred to a recording paper conveyed from a paper feeding device, and the transferred visible image is fixed on the recording paper by a fixing device. A recording sheet supported by the lower main body and supported below the lower main body so as to remain in the lower main body while supporting the latent image carrier and the developing device and leaving the upper main body open upward. A positioning frame that constitutes a transport guide, the positioning frame is supported so as to be movable upward with respect to the lower body, and the optical system device is supported on the side of the upper body,
When the upper body is closed with respect to the lower body, an elastic member for urging the positioning frame upward is attached to the positioning frame and the lower body so that a part of the positioning frame comes into pressure contact with a part of the optical system device. An image forming device characterized by being interposed between them. 2. A recording sheet conveyed from a sheet feeding device passes through the latent image carrier, and then passes through a fixing device located on the side opposite to the sheet feeding device with the latent image carrier as a reference. The paper device, the latent image carrier, and the fixing device are arranged, and the positioning frame is rotatably supported by the lower main body in an upward direction with an end portion on the fixing device side as a fulcrum. Imaging device.