JP2021135348A - Image reading device and image forming apparatus - Google Patents

Abstract

To provide an image reading device including a fixing structure that can prevent the generation of chips.SOLUTION: An image reading device 101 comprises: a reading unit; a rail part; a driving unit that moves the reading unit along the rail part; a housing including a frame 211 that has an opposing part 211a opposite to the rail part and an exterior member 212 that is fixed to the frame; and a fixing structure 50 for fixing the exterior member 212 to the frame 211. The fixing structure 50 includes: a coil spring 52 that is inserted into a first through hole 211b provided on the opposing part 211a; and a mail screw 51 that is inserted into a second through hole 212b provided in the exterior member 212 and the coil spring 52. The coil spring 52 has a spiral part 512 that is fitted to a screw groove provided in the mail screw 51, and the exterior member 212 is fixed to the frame 211 in a state in which the spiral part 512 presses an inner wall surface of the frame 211 that defines the first through hole 211b.SELECTED DRAWING: Figure 5

Description

The present invention relates to an image reader and an image forming apparatus.

Conventionally, a method of fitting a male screw and a female screw to fix a member is widely known. Some female threads exist as parts with threaded grooves, such as nuts.

For example, Japanese Patent Application Laid-Open No. 11-125231 (Patent Document 1) discloses that a coil spring is interposed between a male screw and a female screw in order to further strengthen the fitting between the male screw and the female screw. Has been done.

Further, Japanese Patent Application Laid-Open No. 2016-161126 (Patent Document 2) discloses that a regulating member for preventing the nut from falling off is provided below the nut in order to prevent the nut fastened to the bolt from loosening. The regulating member is composed of a cylinder and a coil spring having an inner coil portion and an outer coil portion. The outer coil portion is in close contact with the outer peripheral surface of the cylinder, and the inner coil portion is attached to the tip of a bolt exposed from the nut. It is in close contact.

Here, in precision equipment such as an image reader and an image forming apparatus, a method of directly cutting a screw groove (female screw groove) in a sheet metal frame supporting other parts is generally used in order to reduce the size, cost, and weight. Is the target.

The method is to press only the pilot holes without screw grooves on the frame and then post-machine the screw grooves with a tool called a screw tap, and to eliminate the need for post-processing with a special tool, the screw tap shape. There is a method of fastening a part while the screw itself forms a screw groove by inserting the self-tapping screw at the tip of the screw into a pilot hole without a screw groove while rotating the screw. Both are processes for cutting sheet metal, and the thread groove of a male screw and the processed screw groove (female screw) are fitted and fixed.

Japanese Unexamined Patent Publication No. 11-125231 Japanese Unexamined Patent Publication No. 2016-16126

However, when the exterior parts are screwed to the frame housing made of sheet metal, the screw groove and the male screw slide strongly and the screw groove is partially cut, so that chips fall directly under the screw hole. Sometimes. In particular, since the screws are hardened, they have a higher hardness than a frame made of sheet metal. Therefore, when the screw slides on the frame during screwing, chips are likely to be generated.

Since the image reader needs to be dustproof, a sealed frame configuration is assembled in a clean room. Therefore, if chips fall into the device during the final process of mounting the exterior parts, it is not possible to easily remove the foreign matter of the dropped chips.

In particular, when the image reading device is disassembled for removing chips outside the clean room, a new problem occurs in which foreign matter in the air is mixed and adheres to the image sensor or the like to generate image noise. Chips made of metal such as iron are large and hard foreign substances. Therefore, if the image reading unit falls on the rail when scanning a document, shock noise may be formed in the image due to contact between the slider bush and foreign matter during scanning, or abnormal noise may be generated due to an increase in sliding resistance. Further, also in the image forming apparatus, when each component is arranged in the housing, if chips fall on the circuit board, the circuit may be short-circuited. As described above, a fixed structure capable of suppressing the generation of chips was required.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an image reading device and an image forming device having a fixed structure capable of suppressing the generation of chips. ..

The image reading device based on the present invention includes a reading unit that reads a document, a rail portion that scanably supports the reading unit, a driving unit that moves the reading unit along the rail portion, and an upper part of the rail portion. A housing having a frame having facing portions facing from the side and an exterior member fixed to the frame, accommodating the reading unit and the rail portion, and a fixing structure for fixing the exterior member to the frame. To be equipped with. A first through hole is provided in the facing portion. The exterior member is provided with a second through hole at a position facing the first through hole. The fixed structure includes a coil spring inserted into the first through hole, and a male screw inserted into the second through hole and the coil spring. The coil spring has the same twisting direction as the male screw, and has a spiral portion that fits into a screw groove provided in the male screw. The exterior member is fixed to the frame in a state where the spiral portion presses the inner wall surface of the frame that defines the first through hole.

In the image reading device based on the present invention, the coil spring may have a first end portion drawn out from the first through hole to the side where the exterior member is located. In this case, it is preferable that the first end portion is engaged with a part of the frame so that the movement of the coil spring is restricted with respect to the frame.

In the image reading device based on the present invention, the first end portion of the coil spring is engaged with the part of the frame so that the coil spring does not rotate around the axis of the first through hole. You may.

In the image reading device based on the present invention, the frame may be provided with a locking portion in which a part of the frame is bent, and the first end portion of the coil spring is engaged with the above. It may have a hook shape that engages with the stop.

In the image reading device based on the present invention, at least a part of the coil spring pulled out from the first through hole to the side where the exterior member is located is sandwiched between the facing portion and the exterior member. You may.

In the image reading device based on the present invention, the coil spring may have a second end portion that is pulled out from the first through hole on the side opposite to the side where the exterior member is located. In this case, the second end portion may have a shape that covers the tip end side of the male screw.

In the image reading device based on the present invention, it is preferable that the male screw and the coil spring have a hardness harder than that of the frame.

The image forming apparatus based on the first aspect of the present invention includes the image reading apparatus.
The image forming apparatus based on the second aspect of the present invention includes an image forming unit, a circuit board for controlling the image forming unit, a housing accommodating the image forming unit and the circuit board, and the housing. A frame that is arranged inside the body and has an opposing portion that faces the circuit board from above, a fixed member that is arranged above the circuit board and fixed to the frame, and a fixed member that is fixed to the frame. It is provided with a fixed structure for the purpose of. A first through hole is provided in the facing portion. The fixed member is provided with a second through hole at a position corresponding to the first through hole. The fixed structure includes a coil spring inserted into the first through hole, and a male screw inserted into the second through hole and the coil spring. The coil spring has the same twisting direction as the male screw, and has a spiral portion that fits into a screw groove provided in the male screw. The fixed member is fixed to the frame in a state where the spiral portion presses the inner wall surface of the frame that defines the first through hole.

According to the present invention, it is possible to provide an image reading device and an image forming device having a fixed structure capable of suppressing the generation of chips.

It is the schematic of the image forming apparatus which concerns on Embodiment 1. FIG. It is a partial cross-sectional view of the image reading apparatus which concerns on Embodiment 1. FIG. It is a perspective view which shows the state before fixing the exterior member in the image reading apparatus which concerns on Embodiment 1. FIG. It is a perspective view which shows the state after fixing the exterior member in the image reading apparatus which concerns on Embodiment 1. FIG. It is sectional drawing which shows the appearance that the exterior member is fixed by the fixed structure in the image reading apparatus which concerns on Embodiment 1. FIG. It is a perspective view which shows the state which the coil spring included in the fixed structure which concerns on Embodiment 1 is attached to a frame. It is a perspective view which shows the coil spring included in the fixed structure which concerns on Embodiment 1. FIG. It is sectional drawing which shows the appearance that the exterior member is fixed by the fixed structure in the image reading apparatus which concerns on Embodiment 2. FIG. It is a perspective view which shows the coil spring included in the fixed structure which concerns on Embodiment 2. FIG. It is the schematic which shows the image forming apparatus which concerns on Embodiment 3. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

(Embodiment 1)
[Image forming device]
FIG. 1 is a schematic view of an image forming apparatus according to a first embodiment. The image forming apparatus 1 according to the first embodiment will be described with reference to FIG.

Hereinafter, the case where the image forming apparatus 1 is a color printer will be described, but the image forming apparatus 1 is not limited to the color printer. For example, the image forming apparatus 1 may be a monochrome printer, a FAX, or a monochrome printer, a color printer, and a multi-function peripheral (MFP).

As shown in FIG. 1, the image forming apparatus 1 according to the first embodiment includes an image reading unit 100, an image forming unit 110, and a paper feeding unit 120.

The image reading unit 100 includes an image reading device 101, an automatic document feeder (ADF: Automatic Document Feeder) 102, and a document tray 103. The automatic document transfer device 102 supplies the documents placed on the document tray 103 one by one to the image reading device 101. The image reading device 101 reads the document supplied by the automatic document transporting device 102, reads the document S (see FIG. 2) placed on the platen glass 220 (see FIG. 2), and generates image data.

The image forming unit 110 forms an image based on the image data generated by the image reading device 101, for example. The image forming unit 110 includes an image forming unit 111, an intermediate transfer belt 112, a secondary transfer roller 113, and a fixing device 114.

The image forming unit 110 forms a toner image for each of the yellow (Y), magenta (M), cyan (C), and black (K) colors in the image forming unit 111, and sequentially superimposes them on the intermediate transfer belt 112. At the same time, electrostatic transfer (primary transfer) is performed to obtain a color toner image. The intermediate transfer belt 112 is an endless belt that rotates in the direction of arrow C in FIG.

The paper feed unit 120 supplies the recording medium from the paper feed tray 121. The recording medium is conveyed to a nip portion formed by the secondary transfer roller 113 and the intermediate transfer belt 112, and the toner image is transferred from the intermediate transfer belt 112.

The recording medium on which the toner image is transferred is pressurized and heated by the fixing device 114. At this time, the toner image melts on the recording medium and is fixed on the recording medium. After that, the recording medium is discharged to the discharge tray.
[Image reader]
FIG. 2 is a partial cross-sectional view of the image reading device according to the first embodiment. The configuration of the image reading device 101 will be described with reference to FIG. In the following, the case where the image reading device 101 is of the CCD type will be described as an example, but the present invention is not limited to this, and the CIS type may be used.

As shown in FIG. 2, the image reading device 101 includes a reading unit 200, a housing 210 including a platen glass 220, a slider bush 230, a rail portion 240, a driving portion 250, and a fixed structure 50 (see FIG. 4).

The reading unit 200 reads an image of the document S placed on the platen glass 220. The reading unit 200 includes a slider unit 201 as a carriage and an optical system 202.

The slider portion 201 is provided so as to be slidable along the rail portion 240. Specifically, the slider portion 201 is connected to the rail portion 240 by the slider bush 230.

The optical system 202 is arranged inside the slider unit 201. The optical system 202 guides the light emitted from the light source and reflected from the document D placed on the platen glass 220 to an element such as a CCD. An element such as a CCD may be provided outside the slider unit 201, or may be provided inside the slider unit 201.

The rail portion 240 extends in a predetermined direction. The rail portion 240 supports the reading unit 200 so that it can be scanned. The drive unit 250 moves the reading unit 200 along the rail unit 240. As the drive unit 250, for example, an optical motor or the like can be adopted.

The housing 210 has a box-like shape, and houses at least the reading unit 200 and the rail portion 240 inside. A part of the ceiling portion of the housing 210 is made of platen glass 220.

FIG. 3 is a perspective view showing a state before fixing the exterior member in the image reading device according to the first embodiment. FIG. 4 is a perspective view showing a state after the exterior member is fixed in the image reading device according to the first embodiment. The configuration of the housing 210 of the image reading device 101 will be described with reference to FIGS. 3 and 4.

As shown in FIGS. 3 and 4, the housing 210 includes a frame 211 and an exterior member 212. The frame 211 is provided so as to surround the platen glass 220. The frame 211 has an opposing portion 211a facing the rail portion 240 from above. The frame 211 is made of, for example, a metal member such as sheet metal.

The exterior member 212 is provided so as to cover the frame 211. The exterior member 212 is fixed to the frame 211 by the fixing structure 50. The exterior member 212 is made of, for example, a resin member.

FIG. 5 is a cross-sectional view showing how the exterior member is fixed by the fixed structure in the image reading device according to the first embodiment. FIG. 6 is a perspective view showing a state in which the coil spring included in the fixed structure according to the first embodiment is attached to the frame. FIG. 7 is a perspective view showing a coil spring included in the fixed structure according to the first embodiment. A mode in which the exterior member 212 is fixed by the fixing structure 50 will be described with reference to FIGS. 5 to 7.

As shown in FIG. 5, the facing portion 211a of the frame 211 is provided with a first through hole 211b penetrating in the thickness direction of the frame 211. Further, the facing portion 211a is bent so that the tongue piece portion forming a part of the facing portion 211a faces the exterior member 212 side (specifically, the portion of the exterior member 212 facing the facing portion 211a). The bent portion 211c is provided.

The bent portion 211c includes a standing wall portion 211c1 that goes upward from the facing portion 211a and a flat portion 211c2 that is substantially parallel to the facing portion 211a from the standing wall portion 211c1. The bent portion 211c corresponds to a locking portion that engages with the first end portion 52a of the coil spring 52, which will be described later.

In the exterior member 212, a second through hole 212b is provided at a position corresponding to the first through hole 211b.

The fixed structure 50 includes a male screw 51 and a coil spring 52. The male screw 51 and the coil spring 52 have a hardness harder than that of the frame 211 made of sheet metal.

The male screw 51 includes a head portion 511 and a shaft portion 512 having a thread groove formed therein. The head portion 511 is exposed to the outside of the exterior member 212 and tightens the exterior member 212. The shaft portion 512 is inserted into the inside of the spiral portion 522 of the coil spring 52, which will be described later, through the second through hole 212b.

As shown in FIGS. 5 to 7, the coil spring 52 includes a first end 52a, a second end 52b, a connection 521, and a spiral 522. The spiral portion 522 is inserted into the first through hole 211b. The spiral portion 522 has the same twisting direction as the male screw 51. The spiral portion 522 fits into the thread groove provided in the shaft portion 512 of the male screw 51.

The first end portion 52a is a portion constituting one end side of the coil spring 52. The first end portion 52a is pulled out from the first through hole 211b to the side where the exterior member 212 is located (more specifically, the side of the exterior member 212 where the portion facing the facing portion 211a is located).

The first end portion 52a is engaged with the bent portion 211c provided on the facing portion 211a. Specifically, the first end portion 52a has a hook shape and is hooked on the bent portion 211c provided on the facing portion 211a. More specifically, the first end portion 52a has an annular shape, and the standing wall portion 211c1 of the bent portion 211c is inserted into the annular shape cavity portion.

As a result, when the shaft portion 512 of the male screw 51 is inserted into the spiral portion 522 and screwed, the spiral portion 522 is restricted from rotating around the axis of the first through hole 211b. Further, by arranging the flat portion 211c2 above the first end portion 52a, it is possible to regulate that the coil spring 52 moves upward when the exterior member 212 is assembled.

The connecting portion 521 connects the first end portion 52a and the spiral portion 522. The connecting portion 521 is sandwiched between the exterior member 212 and the facing portion 211a. This also makes it possible to regulate the movement of the coil spring 52 when the exterior member 212 is assembled.

The second end portion 52b is a portion constituting the other end side of the coil spring 52, and constitutes the tip end side of the spiral portion 522. The second end portion 52b is pulled out from the first through hole 211b to the side opposite to the side where the exterior member 212 is located. That is, the second end portion 52b is pulled out inside the housing 210.

When fixing the exterior member 212 to the frame 211 using the fixing structure 50, first, the coil spring 52 is attached to the facing portion 211a of the frame 211. Specifically, the spiral portion 522 of the coil spring 52 is inserted into the first through hole 211b provided in the facing portion 211a of the frame 211, and the first end portion 52a of the coil spring 52 is engaged with the bent portion 211c. The first end 52a of the coil spring 52 may be engaged with the bent portion 211c, and then the spiral portion 522 may be inserted into the first through hole 211b. The spiral portion 522 may be inserted at the same time.

Subsequently, the frame 211 is covered with the exterior member 212 so that the second through hole 212b provided in the exterior member 212 overlaps the first through hole 211b. At this time, the connecting portion 521 of the coil spring 52 is sandwiched between the exterior member 212 and the facing portion 211a.

Next, the tip of the male screw 51 is inserted into the inside of the spiral portion 522 of the coil spring 52 through the second through hole 212b. Then, the male screw 51 is rotated in the tightening direction. At this time, since the first end portion 52a of the coil spring 52 is engaged with a part of the frame 211 as described above, it is possible to prevent the coil spring 52 from rotating due to the rotation of the male screw 51.

By rotating the male screw 51 and allowing the male screw 51 to enter the inside of the spiral portion 522, the spiral portion 522 is expanded in the radial direction while being fitted (screwed) into the thread groove of the male screw 51. .. As a result, the exterior member 212 is fixed to the frame 211 in a state where the spiral portion 522 presses the inner wall surface of the frame 211 that defines the first through hole 211b.

Here, in the male screw 51, various dimensions of the outer diameter of the screw, the root diameter of the screw, and the pitch of the screw are defined by the JIS standard. The wire diameter of the spiral portion 522 of the coil spring 52 is preferably a diameter at which the spiral portion 522 is not buried in the thread groove of the male screw 51, and is preferably equal to or less than the screw pitch.

When the spiral portion 522 is buried in the thread groove of the male screw 51, the inner wall surface of the frame 211 defining the first through hole 211b and the spiral portion 522 do not come into contact with each other, and the spiral portion 522 does not come into contact with the inner wall surface of the frame 211 at the time of assembly. There is a concern that the screw thread will slide. Further, when the wire diameter of the spiral portion 522 of the coil spring 52 is larger than the pitch of the screw, the spiral portion 522 cannot be fitted into the screw groove.

Further, the inner diameter of the spring in the spiral portion 522 of the coil spring 52 is preferably smaller than the outer diameter of the male screw 51. As a result, the thread groove of the male screw 51 can be fitted into the spiral portion 522. The hole diameter of the first through hole 211b is larger than the outer diameter of the male screw 51 and smaller than the maximum outer diameter of the spiral portion 522 when the spiral portion 522 is expanded by the male screw 51.

For example, when the outer diameter of the screw is 3.0 mm, the valley diameter of the screw is 2.459 mm, and the pitch is 0.5 mm, the hole diameter of the first through hole 211b is φ3.1 mm. It is preferable to do so.

When the coil spring 52 has the above dimensions, the wire diameter of the spiral portion 522 of the coil spring 52 is preferably φ0.25 mm or more and 0.5 mm or less. Further, the inner diameter of the spring in the spiral portion 522 is preferably smaller than φ3.0 mm.

With such dimensions, when the exterior member 212 is fixed to the frame 211 using the fixing structure 50, a tightening torque of approximately 9 kgfcm can be obtained as in the case where a screw groove (female screw) is machined in the frame 211. ..

Further, when the male screw 51 is rotated as described above to allow the male screw 51 to enter the inside of the spiral portion 522, the top of the thread of the male screw 51 defines the first through hole 211b. It enters between the spiral portions 522 without touching the inner wall surface of 211. Therefore, the male screw 51 can prevent the inner wall surface of the frame 211 defining the first through hole 211b from being scraped, so that the generation of chips can be suppressed.

As a result, it is possible to prevent chips from falling onto the rail portion 240, shock noise is formed in the image due to contact between the slider bush and foreign matter during scanning of the reading unit 200, and abnormal noise is generated due to an increase in sliding resistance. It is possible to suppress the noise.

As described above, the image reading device 101 and the image forming device 1 according to the first embodiment can suppress the generation of chips by having the fixed structure 50.

(Embodiment 2)
FIG. 8 is a cross-sectional view showing how the exterior member is fixed by the fixed structure in the image reading device according to the second embodiment. FIG. 9 is a perspective view showing a coil spring included in the fixed structure according to the second embodiment. The image reading device 101 according to the second embodiment will be described with reference to FIGS. 8 and 9.

As shown in FIG. 8, the image reading device 101A according to the second embodiment has a different shape of the coil spring 52A in the fixed structure 50 when compared with the image reading device 101 according to the first embodiment. Other configurations are almost the same.

Similar to the first embodiment, the coil spring 52A has a first end portion 52a pulled out from the first through hole 211b to the side where the exterior member 212 is located and a side from the first through hole 211b where the exterior member 212 is located. It has a second end 52b that is pulled out to the opposite side.

As shown in FIGS. 8 and 9, in the coil spring 52A of the second embodiment, the second end portion 52b has a shape of covering the tip end side of the male screw 51. That is, the second end portion 52b has a bag-like shape. Specifically, the second end portion 52b of the coil spring 52A has a shape in which the inner diameter gradually decreases as the distance from the facing portion 211a increases.

Even in such a case, the image reading device 101A according to the second embodiment has substantially the same effect as the image forming reading device 101 according to the first embodiment. Further, the second end portion 52b of the coil spring 52A has a shape that covers the tip end side of the male screw 51. Therefore, when the male screw 51 is inserted, when the male screw 51 slides on the coil spring 52, even if the coil spring 52 is scraped, the chips can be captured by the second end portion 52b. can.

(Embodiment 3)
FIG. 10 is a schematic view showing an image forming apparatus according to the third embodiment. The image forming apparatus 1B according to the third embodiment will be described with reference to FIG.

As shown in FIG. 10, in the image forming apparatus 1B according to the third embodiment, the fixed member 170 has a fixed structure 50 above the circuit board 150 when compared with the image forming apparatus 1 according to the first embodiment. It differs in that it is fixed to the frame 160 using. Other configurations are almost the same.

The image forming apparatus 1B according to the third embodiment includes an image forming unit 110, a circuit board 150, a housing 80, a frame 160, a fixed member 170, and a fixed structure 50.

The circuit board 150 controls the image forming unit 110. The circuit board 150 is arranged so that the mounting surface 150a on which the electronic components are mounted faces upward. For example, a high voltage is applied to the electronic components mounted on the circuit board 150.

The housing 80 has a box shape and houses the image forming unit 110 and the circuit board 150. The frame 160 is arranged in the housing 80 and has a facing portion 161 facing the circuit board 150 from above. Specifically, the facing portion 161 faces the mounting surface 150a on the circuit board 150 described above.

The fixed member 170 is arranged above the circuit board 150 and is fixed to the frame 160 by the fixing structure 50 as in the first embodiment. The fixed member 170 may be, for example, a holding member that holds various parts constituting the image forming portion 110, or an exterior member that forms a part of the housing 80.

The facing portion 161 is provided with a first through hole 161a, and the fixed member 170 is provided with a second through hole 171a at a position corresponding to the first through hole 161a.

The fixed structure 50 has the same configuration as that of the first embodiment, and has a coil spring 52 provided in the first through hole 161a and a male screw 51 inserted into the second through hole 171a so as to reach the inside of the coil spring 52. And include. The coil spring 52 has the same twisting direction as the male screw 51, and has a spiral portion that fits into the thread groove provided in the male screw 51. The fixed member 170 is fixed to the frame 160 in a state where the spiral portion presses the inner wall surface of the frame 160 defining the first through hole 161a.

In this case, as in the first embodiment, the top of the thread of the male screw 51 does not come into contact with the inner wall surface of the frame 160 defining the first through hole 161a, and the spiral of the coil spring 52. Get in between the clubs. Therefore, the male screw 51 can prevent the inner wall surface of the frame 160 defining the first through hole 161a from being scraped, so that the generation of chips can be suppressed.

Therefore, it is possible to prevent chips from falling on the mounting surface 150a of the circuit board 150. As a result, it is possible to prevent the electronic equipment mounted on the circuit board 150 from being short-circuited, and to prevent the occurrence of electrical system malfunctions.

In the third embodiment described above, the circuit board 150 is arranged so that the mounting surface 150a faces upward, but the present invention is not limited to this, and the mounting surface 150a intersects in the vertical direction. , More specifically, the circuit board 150 may be arranged so as to face the horizontal direction.

As described above, the embodiment invented this time is an example in all respects and is not limiting. The scope of the present invention is indicated by the claims and includes all modifications within the meaning and scope equivalent to the claims.

1,1B image forming device, 50 fixed structure, 51 male screw, 52, 52A coil spring, 52a 1st end, 52b 2nd end, 80 housing, 100 image reader, 101, 101A image reader, 102 automatic Document carrier, 103 Original tray, 110 image forming unit, 111 image forming unit, 112 intermediate transfer belt, 113 secondary transfer roller, 114 fixing device, 120 paper feeding unit, 121 paper feeding tray, 150 circuit board, 150a mounting surface , 160 frame, 161 facing part, 161a first through hole, 170 fixed member, 171a second through hole, 200 reading unit, 201 slider part, 202 optical system, 210 housing, 211 frame, 211a facing part, 211b 1 penetration, 211c bent part, 211c1 standing wall part, 211c2 flat part, 212 exterior member, 212b second through hole, 220 platen glass, 230 slider bush, 240 rail part, 250 drive part, 511 head, 512 shaft part, 521 connection part, 522 spiral part.

Claims (9)

A reading unit that reads images and
A rail portion that supports the reading unit so that it can be scanned, and
A drive unit that moves the reading unit along the rail unit, and
A frame having a portion facing the rail portion from above and an exterior member fixed to the frame, and a housing for accommodating the reading unit and the rail portion.
A fixing structure for fixing the exterior member to the frame is provided.
A first through hole is provided in the facing portion.
The exterior member is provided with a second through hole at a position facing the first through hole.
The fixing structure includes a coil spring inserted into the first through hole, the second through hole, and a male screw inserted into the coil spring.
The coil spring has the same twisting direction as the male screw and has a spiral portion that fits into a screw groove provided in the male screw.
An image reading device in which the exterior member is fixed to the frame in a state where the spiral portion presses the inner wall surface of the frame defining the first through hole. The coil spring has a first end portion that is pulled out from the first through hole to the side where the exterior member is located.
The image reading device according to claim 1, wherein the first end portion is engaged with a part of the frame so that the movement of the coil spring is restricted with respect to the frame. The image reading device according to claim 2, wherein the first end portion of the coil spring is engaged with the part of the frame so that the coil spring does not rotate about the axis of the first through hole. The frame is provided with a locking portion in which a part of the frame is bent.
The image reading device according to claim 3, wherein the first end portion of the coil spring has a hook shape that engages with the locking portion. According to any one of claims 1 to 4, at least a part of the coil spring pulled out from the first through hole to the side where the exterior member is located is sandwiched between the facing portion and the exterior member. The image reader of the description. The coil spring has a second end portion that is pulled out from the first through hole to a side opposite to the side where the exterior member is located.
The image reading device according to any one of claims 1 to 5, wherein the second end portion has a shape that covers the tip end side of the male screw. The image reading device according to any one of claims 1 to 6, wherein the male screw and the coil spring have a hardness harder than that of the frame. An image forming apparatus comprising the image reading apparatus according to any one of claims 1 to 7. Image forming part and
A circuit board for controlling the image forming unit and
A housing that houses the image forming unit and the circuit board,
A frame arranged in the housing and having a facing portion facing the circuit board from above.
A fixed member arranged above the circuit board and fixed to the frame, and
A fixing structure for fixing the fixed member to the frame is provided.
A first through hole is provided in the facing portion.
The fixed member is provided with a second through hole at a position corresponding to the first through hole.
The fixing structure includes a coil spring inserted into the first through hole, the second through hole, and a male screw inserted into the coil spring.
The coil spring has the same twisting direction as the male screw and has a spiral portion that fits into a screw groove provided in the male screw.
An image forming apparatus in which the fixed member is fixed to the frame in a state where the spiral portion presses the inner wall surface of the frame defining the first through hole.

Images