JP2023054431A - Sheet transport device, image reading device, and image formation device - Google Patents

Abstract

To achieve reduction of operating sound.SOLUTION: A sheet transport device includes: a transport roller pair 80 which transports documents D including a document D1 having a first width W1 and a document D2 having a second width W2 wider than the first width W1 in a transport direction; restriction members 61, 62, 63, 64 each of which is disposed at the upstream side of a nip part of the transport roller pair 80 in the transport direction and may move between a restriction position where the restriction member contacts with a tip of the document D2 transported toward the transport roller pair 80 to restrict transport of the document D2 and an allowable position where the restriction member is pressed by the tip of the document D2 to allow transport of the document D2; and a biasing member which biases the restriction members 61, 62, 63, 64 so that the restriction members 61, 62, 63, 64 are located at the restriction position. The restriction members 61, 62, 63, 64 are not disposed in a first area Ar1, which overlaps with an area where the document D1 passes in a width direction W, and are disposed at a second area Ar2, which is other than the first area Ar1, of an area where the document D2 passes.SELECTED DRAWING: Figure 6

Description

The present invention relates to a sheet conveying device that conveys a sheet, and an image reading device and an image forming device using the same.

2. Description of the Related Art Conventionally, image reading apparatuses have been widely used that can automatically feed documents (sheets) stacked on a document tray or the like one by one and read image information of the fed documents. An ADF (Auto Document Feeder) that automatically feeds a document is widely used as a sheet conveying device used in this image reading apparatus. Further, as such a sheet conveying device, one having a sheet skew correction mechanism is known (see Patent Document 1).

In a sheet conveying apparatus having this skew correction mechanism, a pair of conveying rollers having a nip portion arranged on a conveying path of a sheet, a shutter provided on the pair of conveying rollers, and a pair of upstream rollers conveying the sheet to the pair of conveying rollers. and a transport device. The shutter is arranged upstream from the nip portion of the conveying roller pair. The shutter has a regulating position in which the leading edge of the sheet conveyed toward the pair of conveying rollers abuts to restrict the conveyance of the sheet, and a permitting position in which the sheet is pressed by the leading edge of the sheet to allow the sheet to be conveyed. It is movable by swinging. When the shutter is positioned at the regulating position, the shutter stops the sheet so as to obtain a skew correcting effect of straightening the sheet from a skewed state.

JP-A-11-139626

2. Description of the Related Art In recent years, image reading apparatuses are required to read documents of various sizes. Among them, there is a demand for an image reading apparatus capable of reading a small size document such as a business card size. Business cards are often made of strong thick paper (basis weight of 128 g/m ² or more), and have a large conveyance resistance, so that the conveyance noise of rubbing the guide member is loud.

However, in the sheet conveying apparatus described in Japanese Patent Application Laid-Open No. 2002-200010, since it is assumed that the sheet to be conveyed is a normal sheet with low stiffness, the urging force of the shutter is set to a strength corresponding to it. Therefore, when a card having a strong stiffness is conveyed by the sheet conveying apparatus described in Japanese Patent Laid-Open No. 2002-200310, the shutter is pressed and the business card is easily moved, and there is a possibility that the effect of skew correction is hardly seen. . In this way, although the business card is rigid, the effect of skew correction by the stopping force of the shutter can hardly be expected. When returning, an operation sound occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet conveying device, an image reading device, and an image forming device capable of reducing operating noise.

A sheet conveying apparatus of the present invention includes a pair of conveying rollers for conveying a sheet including a first sheet having a first width and a second sheet having a second width wider than the first width in a conveying direction; a regulating position arranged on the upstream side in the conveying direction of the nip portion of the pair of rollers and at which the leading edge of the second sheet conveyed toward the pair of conveying rollers abuts to regulate the conveying of the second sheet; a regulating member that is pressed by the leading edge of the second sheet and is movable to a permitting position that permits conveyance of the second sheet; and an urging member that urges the regulating member to the regulating position. , the regulating member is not arranged in a first region overlapping a region through which the first sheet passes in a width direction intersecting the conveying direction, and is not arranged in the first region out of regions through which the second sheet passes. It is characterized by being arranged in a second area other than the area.

According to another aspect of the invention, there is provided an image reading apparatus including the sheet conveying apparatus described above and a reading section that reads an image of the sheet conveyed by the sheet conveying apparatus.

According to another aspect of the invention, there is provided an image forming apparatus comprising the image reading device described above and an image forming section for forming an image on a recording material based on the image read by the image reading device.

According to the present invention, it is possible to reduce operating noise.

1 is a cross-sectional view showing an image forming apparatus according to an embodiment; FIG. 1 is a perspective view showing a document reading device according to an embodiment; FIG. 3 is a perspective view of a conveying roller pair and a registration shutter mechanism according to the embodiment; FIG. FIG. 4 is a cross-sectional view showing the document reading device according to the embodiment, in which the regulating member is positioned at the regulating position and regulating a normal size document; FIG. 2 is a cross-sectional view showing the document reading apparatus according to the embodiment, in which the regulating member is pressed against the document and positioned at the allowable position, allowing the document to be conveyed; FIG. 4 is a plan view showing the arrangement of regulating members of the register shutter mechanism according to the embodiment; FIG. 4 is a cross-sectional view showing the document reading apparatus according to the embodiment, in which the regulating member is positioned at the regulating position and the small-sized document is conveyed without being regulated by the regulating member;

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 7. FIG. In this embodiment, as shown in FIG. 1, a case will be described in which a document reading device 1 equipped with a document feeding device 20, which is an example of a sheet conveying device, is applied to an image forming apparatus 100. FIG. This image forming apparatus 100 includes an image forming section 101 that forms an image on a recording material based on an image read by the document reading device 1 .

[Document reader]
FIG. 1 is a cross-sectional view of a document reading apparatus 1 according to this embodiment, and FIG. 2 is a perspective view thereof. In this embodiment, the main scanning direction (width direction W) orthogonal to the transport direction of the document D of the document reading device 1 is defined as the front-rear direction. A document reading device 1 , which is an example of an image reading device, includes a document feeding device 20 and a document platen scanner 50 . The platen scanner 50 is a platen scanning type document reading device capable of reading a document placed on the platen glass, and has a housing 51 and a first reading unit 52 . The first reading unit 52 is an example of a reading section, and irradiates the image information surface of the document D with light from an LED array as a light source, and the reflected light reflected by the image information surface is sent to a sensor element by a SELFOC (registered trademark) lens. image is formed on the surface and image information is read. That is, the document reading device 1 reads the image of the document D conveyed by the document feeding device 20 .

[Document feeder]
The document feeding device 20 is an ADF, and includes a document tray 3 on which a document D, which is an example of a sheet, is placed, a feeding unit 21, a conveying section 22, and a second reading unit 18, which is an example of a reading section. , an ejection tray 24, and the like. Note that the document D is a general term including documents D1, D2, and D3 of various sizes, as will be described later (see FIG. 6). The document feeding device 20 is rotatably provided above the document platen scanner 50 by a hinge portion (not shown).

The feeding unit 21 has an arm 21 a that can move up and down, a feeding roller 17 , a separation roller 8 and a separation pad 9 . The feeding roller 17, which is an example of a feeding rotating body, is rotatably supported by the arm 21a, contacts the uppermost document D among the plurality of documents D supported by the document tray 3, and feeds it. Pick up and deliver. The separation roller 8 is an example of a separation rotary member, and separates the originals D one by one from the separation pad 9 when a plurality of originals D are fed by the feeding roller 17 .

The transport section 22 has a transport guide 40 that forms a curved transport path in a substantially U shape. The transport path is formed in a curved shape so as to transport the document supported on the document tray 3 to the discharge tray 24 . The transport guide 40 has an upper guide portion 41 that contacts the upper surface of the document D and guides the document D, and a lower guide portion 42 that contacts the lower surface of the document D and guides the document D. As shown in FIG. The transport unit 22 is provided with a transport roller pair 80 for transporting the document D, an intermediate transport roller 14, a discharge roller pair 15, and an edge sensor 16 for detecting the leading edge and trailing edge of the document D. ing. Further, the conveying portion 22 is provided with a stopper 10 for regulating the position of the leading edge of the document D, an urging spring 12, and a document presence/absence sensor 11 for detecting the presence or absence of the document D. As shown in FIG.

The stopper 10 has a regulating position where the document D supported by the document tray 3 abuts to restrict feeding of the document D, and a permitting position where the document D supported by the document tray 3 is permitted to be fed. provided to be movable. The biasing spring 12 biases the stopper 10 to the restricted position. The document presence/absence sensor 11 has a detection unit that detects the document D. As shown in FIG. The detection portion is arranged upstream of the stopper 10 in the feeding direction, and detects the presence or absence of the document supported by the document tray 3 .

Similarly to the first reading unit 52, the second reading unit 18 irradiates the image information surface of the document D with light from an LED array as a light source, and the reflected light reflected by the image information surface is passed through a SELFOC (registered trademark) lens. Image information is read by forming an image on a sensor element. In the document feeder 20 of this embodiment, when the user places the document D on the document tray 3 and the sub-tray 33, the leading edge position of the document D is regulated by the stopper 10, and the presence of the document D is detected by the document presence/absence sensor 11. is detected.

The document tray 3 is an example of a support section that supports the document D. As shown in FIG. The discharge tray 24 is arranged below the document tray 3, and the documents D are discharged and stacked thereon. As shown in FIG. 2, the document tray 3 is an example of a first regulating portion capable of coming into contact with both sides of the document D in order to regulate the position of the set document D in the width direction W at the center of transport. It has 1 regulation plate 31 and the 2nd regulation plate 32 which is an example of the 2nd regulation part. The first restricting plate 31 and the second restricting plate 32 are connected by a gear train (not shown), and when one restricting plate is operated, the other restricting plate also operates. The amount of movement of the first restricting plate 31 and the second restricting plate 32 is always the same, and it is possible to restrict the document D to the center of transport regardless of the width of the document D. That is, the first regulating plate 31 and the second regulating plate 32 are movably provided so as to interlock with each other in the width direction W, and adjust the positions on both sides of the document D supported on the document tray 3 in the width direction W. regulate.

A sub-tray 33 is provided on the upstream side of the document tray 3 . The sub-tray 33 has a rotating portion 34 and is rotatable with respect to the document tray 3 . Since the sub-tray 33 is provided, it is possible to support the document D whose feeding direction is long. Further, since the sub-tray 33 is rotatable, the sub-tray 33 can be placed in a closed state so as to overlap the document tray 3 . As a result, the visibility and ease of taking out the document D discharged to the discharge tray 24 is improved. Deposition and intrusion into 22 can be suppressed.

When the user gives an instruction to start reading from the operation section or the like of the image forming apparatus 100, a driving motor (not shown) rotates and the feeding unit 21 descends. As a result, the feeding unit 21 lowers the arm 21a to bring the feeding roller 17 into contact with the uppermost document D, and pushes down the stopper 10 with the arm 21a to position the stopper 10 at the allowable position. The document D is fed by the feeding roller 17 .

By the rotation of the feeding roller 17, the document D is fed to the separation portion of the separation roller 8 and the separation pad 9, the document D is separated one by one, and the top document D is separated and fed. Also, the separated document D is conveyed along the conveying guide 40 by the conveying roller pair 80 and conveyed to the reading sections of the first reading unit 52 and the second reading unit 18 .

When the edge sensor 16 detects the leading edge of the document D, the first reading unit 52 starts reading the image information of the front side of the document D at a point where the document D is conveyed from that position by a predetermined distance. , the reading of the image information on the back side of the document D is started. After starting reading, the document D moves toward the intermediate conveying roller 14 . When the trailing edge of the document D is detected by the edge sensor 16, the reading of the image information by the first reading unit 52 and the second reading unit 18 is finished when the document D is conveyed from that position by a predetermined distance. Then, the document D is discharged to the discharge tray 24 by the discharge roller pair 15 . In this manner, the document feeder 20 repeats the above-described reading operation until the document presence/absence sensor 11 detects that there is no document.

[Configuration of register shutter mechanism]
Next, the configuration of the registration shutter mechanism 6 provided near the conveying roller pair 80 will be described in detail with reference to FIG. FIG. 3 is a perspective view of the conveying roller pair 80 and the registration shutter mechanism 6. As shown in FIG. The conveying roller pair 80 has a driven roller 81 and a driving roller 82 that contact each other at the nip portion N and rotate. The driven roller 81 has three rollers 81a, 81b, 81c spaced apart in the width direction W, and a rotary shaft 83 that rotatably supports these rollers 81a, 81b, 81c. ing. Incidentally, the roller 81b is an example of a first roller. The drive roller 82 has roller portions 82a, 82b and 82c corresponding to the three rollers 81a, 81b and 81c, and a drive shaft 84 for rotating these roller portions 82a, 82b and 82c is provided. . The drive shaft 84 is rotated via a gear train by a drive motor (not shown). The rotary shaft 83 and the drive shaft 84 are provided extending in a width direction W that intersects (here, orthogonally) the conveying direction X. As shown in FIG. The roller 81b is an example of a first roller, and the roller portion 82b is an example of a second roller.

The register shutter mechanism 6 is arranged upstream in the transport direction X from the nip portion N of the transport roller pair 80, and includes a plurality of regulating members 61, 62, 63, and 64, a connecting portion 65, and a torsion coil spring. 66. For example, four regulating members 61 , 62 , 63 , 64 are provided, and are rotatably supported coaxially with the rotating shaft 83 between the rollers 81 a , 81 b , 81 c of the driven roller 81 . That is, in the width direction W that is coaxial with the rotating shaft 83, the regulating member 61, rollers 81a, 62, 81b, 63, 81c, and 64 are arranged in order. The regulating member 61 has a bearing portion 61a that is swingably provided with respect to the rotating shaft 83, and a contact portion 61b that is provided continuously with the bearing portion 61a. Similarly, the regulating members 62, 63, 64 are provided continuously with the bearings 62a, 63a, 64a, which are provided so as to be able to swing with respect to the rotating shaft 83, and the respective bearings 62a, 63a, 64a. and contact portions 62b, 63b, 64b. That is, in the present embodiment, the register shutter mechanism 6 includes a plurality of (for example, four) contact portions 61b, 62b, 63b, and 64b arranged at intervals in the axial direction of the rotating shaft 83 and projecting in the radial direction. have.

The connecting portion 65 is an elongated member extending parallel to the rotating shaft 83, and is engaged with the bearing portions 61a, 62a, 63a, 64a so that the four restricting members 61, 62, 63, 64 are interlocked. The contact portions 61b, 62b, 63b, 64b and the opposite side are connected. As a result, the contact portions 61b, 62b, 63b, and 64b protrude outward from the rotating shaft 83 at the same angle and are integrally swingable with respect to the rotating shaft 83. As shown in FIG.

The regulating members 61 , 62 , 63 , 64 can move between the regulating position and the permissible position by swinging about the rotating shaft 83 . The regulation position is a position where the leading edge of the document D conveyed toward the conveying roller pair 80 abuts to regulate the conveyance of the document D (see FIG. 4). The allowable position is a position pressed by the leading edge of the document D to allow the transport of the document D (see FIG. 5). That is, the contact portions 61b, 62b, 63b, and 64b can move between the regulation position overlapping the transport path and the allowable position retracted from the transport path by the swinging of the bearings 61a, 62a, 63a, and 64a.

The torsion coil spring 66 is an example of an urging member, is provided coaxially with the rotating shaft 83, and urges the regulating members 61, 62, 63, 64 to the regulating positions. The contact portions 61b, 62b, 63b, and 64b are regulated by stoppers (not shown) so that they stop at the rotational positions shown in FIG. Therefore, when the leading edge of the document D conveyed in the conveying direction X comes into contact with the contact portions 61b, 62b, 63b, and 64b, the contact portions 61b, 62b, 63b, and 64b resist the biasing force of the torsion coil spring 66. and pressed. That is, the restricting members 61, 62, 63, 64 move against the biasing force of the torsion coil spring 66 when moving from the restricting position to the permitting position. The contact portions 61b, 62b, 63b, and 64b guide the leading edge of the document D to the nip portion N of the transport roller pair 80 while rotating in the rotational direction R2. The document D is adjusted in posture by the contact portions 61b, 62b, 63b, and 64b, and skew correction is performed. When the trailing edge of the skew-corrected document D passes through the nip portion N, it returns to the position shown in FIG.

[Operation of register shutter mechanism]
Next, the operation when the register/shutter mechanism 6 is caused to convey normal-sized originals D2 and D3, which are not small-sized originals, will be described in detail with reference to FIGS. 4 to 6. FIG. The normal size here means a document larger than a business card size, for example, document D2 which is B5 size copy paper (plain paper), document D3 which is A4 size copy paper, and the like. FIG. 5 illustrates the document D3.

FIG. 4 is a cross-sectional view taken along line AA of FIG. 3. As shown in FIG. The leading edge of the document D3 conveyed to the separation roller 8 is in contact with the contact portion 62b of the regulating member 62 of the register shutter mechanism 6. FIG. Since FIG. 4 is a sectional view taken along the line AA in FIG. 3, only the regulating member 62 of the register shutter mechanism 6 is shown. Therefore, although the restricting member 62 will be described below, it is assumed that the other restricting members 61, 63, and 64 also move in the same manner.

As shown in FIG. 4 , the regulation member 62 is arranged downstream of the separation roller 8 in the conveyance direction X, and regulates the conveyance of the document D3 conveyed by the separation roller 8 . At this time, the leading edge of the document D3 has not entered the nip portion N of the transport roller pair 80 . When the leading edge of the document D3 contacts the contact portion 62b of the regulating member 62, the regulating member 62 receives the biasing force of the torsion coil spring 66 and does not rotate. After that, the document D3 forms a loop in the transport guide 40, and the separation roller 8 moves the document D3 while the leading edge of the document D3 is stopped until the stiffness of the document D3 generates a pressing force greater than the biasing force of the torsion coil spring 66. keep transporting. At this time, the leading edge of the document D3 contacts the four contact portions 61b, 62b, 63b, and 64b (two contact portions 62b and 63b in the case of the size of the document D2) of the register/shutter mechanism 6, thereby It is possible to correct the skew by aligning the leading edges of the paper.

Here, it is assumed that the normal size documents D2 and D3 have a basis weight of 52 g/m ² or more and 105 g/m ² or less. That is, the torsion coil spring 66 causes the leading edge of the conveyed document D3 with a basis weight of 52 g/m ² to 105 g/m ² to come into contact with the regulating members 61, 62, 63, and 64 (regulating members 62 and 63 for the document D2). It has an urging force that bends the document D3 and corrects the skew when it comes into contact with the document D3.

Thereafter, as shown in FIG. 5, when the leading edge of the document D3 exerts a predetermined pressing force on the contact portion 62b of the regulating member 62, the regulating member 62 rotates in the rotational direction R2, and the leading edge of the document D3 is transported. It enters the nip portion N of the roller pair 80 . Since the document D3 enters the nip portion N of the transport roller pair 80 in a state where the leading edge of the document D3 is in contact with the contact portions 61b, 62b, 63b, and 64b of the register shutter mechanism 6, the document D3 is kept aligned with the leading edge of the transport roller pair. 80 can be transported.

FIG. 6 shows the positional relationship between the contact portions 61b, 62b, 63b and 64b and the documents D2 and D3 at this time. As shown in FIG. 6, the contact portions 61b, 62b, 63b, and 64b are arranged symmetrically in the width direction W with respect to the transport center C1 of the document D. As shown in FIG. Here, the document D2, which is an example of the second sheet, has a second width W2 in the width direction. A document D3, which is an example of a second sheet, has a third width (second width) W3 wider than the second width W2 in the width direction. The document D2 contacts only two contact portions 62b and 63b. The document D3 contacts four contact portions 61b, 62b, 63b, and 64b. As described above, the contact portions 61b, 62b, 63b, and 64b are different depending on the size in the width direction W of the document.

Next, the relationship between the small size document D1 such as a business card, which is a characteristic configuration of the present invention, and the contact portions 61b, 62b, 63b, and 64b of the register shutter mechanism 6 will be described with reference to FIGS. 6 and 7. FIG. . The document D1, which is an example of the first sheet, is, for example, a business card, and is defined as having a first width W1 of 55 mm or less in the width direction W and a basis weight of 80 g/m ² or more and 230 g/m ² or less in this embodiment. do. As shown in FIG. 6, the distance L between the contact portions 62b and 63b located closest to each other with respect to the transport center C1 is 60 mm. The contact portions 61b, 62b, 63b, and 64b of the register shutter mechanism 6 do not exist within a range of at least 55 mm in the width direction W centering on the transport center C1.

That is, the regulating members 61, 62, 63, and 64 are not arranged in the first area Ar1 overlapping in the width direction W with the area through which the document D1 passes, but in the first area Ar1 out of the areas through which the document D2 and the document D3 pass. It is arranged in a second area Ar2 other than the first area Ar1 (other than the area). In the present embodiment, the first region Ar1 preferably has a length of 56 mm or more in the width direction W, corresponding to the fact that the first width W1 is 55 mm or less. is 60 mm. In addition, the transport center C1 of the document D1 when the document D1 is restricted by the first restriction plate 31 and the second restriction plate 32 (see FIG. 2) overlaps the first area Ar1 in the width direction W.

As described above, since the distance L between the contact portions 62b and 63b of the register shutter mechanism 6 is wider than the first width W1 of the document D1, the document D1 contacts the contact portions 62b and 63b of the register shutter mechanism 6 during transport. do not. Therefore, as shown in FIG. 7, the leading edge of the document D1 does not contact any of the contact portions 61b, 62b, 63b, and 64b of the register shutter mechanism 6 when the document D1 is conveyed. Then, the document D1 enters the nip portion N of the transport roller pair 80 and is transported without moving the register shutter mechanism 6 from the regulating position. Although the document D1 is not subjected to the skew correction effect by the register shutter mechanism 6, the skew correction effect by roller alignment or the like is expected. In addition, even if the document D1 is conveyed obliquely, the reading widths of the first reading unit 52 and the second reading unit 18 are sufficient so that the entire image can be read. Skew correction can be performed by processing.

Also, as the small-sized document D1, a receipt, for example, can be applied in addition to a business card. The receipt here is, for example, narrower than a business card and weaker in stiffness than a business card or copy paper. When a receipt is used as the document D1, the first width W1 of the receipt is narrower than the interval L between the contact portions 62b and 63b of the register shutter mechanism 6. FIG. Here, if a thin and weak document D1 such as a receipt is brought into contact with any of the contact portions 61b, 62b, 63b, and 64b of the register shutter mechanism 6, the tip of the document D1 will be the contact portion. A predetermined pressing force for swinging 61b, 62b, 63b, 64b cannot be applied. Therefore, the contact portions 61b, 62b, 63b, and 64b do not swing to the allowable positions, and the document D1 cannot be conveyed downstream, which may cause a paper jam. On the other hand, in the present embodiment, when the document D1, which is thin and weak like a receipt, is conveyed, it does not contact the contact portions 61b, 62b, 63b, and 64b. can be suppressed.

As described above, according to the document feeding device 20 of the present embodiment, the regulating members 61, 62, 63, 64 are not arranged in the first area Ar1, but are arranged in the second area Ar2 other than the first area Ar1. are placed. Therefore, the small-sized document D1 does not contact any of the abutment portions 61b, 62b, 63b, and 64b of the registration shutter mechanism 6 during conveyance, and the conveyance rollers 10a and 10b do not move the registration shutter mechanism 6 from the regulated position. It enters the nip portion N of the pair 80 and is conveyed. As a result, when the document D1 abuts against the regulating members 61, 62, 63, 64, or after the document D1 passes through the regulating members 61, 62, 63, 64, the regulating members 61, 62, 63, 64 are brought to the regulating positions. When returning, it is possible to suppress the occurrence of operation sounds. Therefore, it is possible to reduce the operation noise when the document D1 is conveyed.

Further, according to the document feeding device 20 of the present embodiment, the transport center C1 of the document D1 when the document D1 is restricted by the first regulating plate 31 and the second regulating plate 32 of the document tray 3 is It overlaps with the first region Ar1. Therefore, since the document D1 passes through the first area Ar1 during transport, it can be prevented from coming into contact with any of the contact portions 61b, 62b, 63b, and 64b of the register shutter mechanism 6. operation noise can be reduced.

Further, according to the document feeding device 20 of this embodiment, the register shutter mechanism 6 is provided with four regulating members 61 , 62 , 63 and 64 . Therefore, skew correction can be effectively performed for a plurality of types of normal size documents D2 and D3, such as document D2 and document D3.

Further, according to the document feeding device 20 of the present embodiment, the torsion coil spring 66 allows the front end of the transported document D3 with a basis weight of 52 g/m ² to 105 g/m ² to be regulated by the regulating members 61, 62, 63, 64, it has an urging force that bends the document D3 and corrects the skew. Therefore, when copy paper having a basis weight of about 65 g/m ² is conveyed as the document D3, the skew can be corrected by the regulation members 61, 62, 63, and 64. FIG.

Although the document feeder 20 of the present embodiment described above has been described as having four regulating members 61, 62, 63, and 64 in the register shutter mechanism 6, the present invention is not limited to this. For example, five or more may be provided, or one may be provided on both sides in the width direction W with the first region Ar1 interposed therebetween.

Further, in the document feeding device 20 of the present embodiment, the case where the first area Ar1 is arranged at the center of the transport roller pair 80 in the width direction W and the second areas Ar2 are arranged on both sides thereof is described. However, it is not limited to this. For example, the first area Ar1 may be arranged on one side in the width direction of the conveying roller pair 80, and the other area may be the second area Ar2. In this case, a plurality of regulating members may be provided, or only one regulating member may be arranged by providing a sufficient length in the width direction.

In addition, in the document feeder 20 of the present embodiment, the first width W1 of the document D1 is 55 mm or less, and correspondingly, the first area Ar1 is set to 56 mm or more in the width direction W, and furthermore, the contact is made with a margin. A case where the interval L between the portions 62b and 63b is 60 mm is described. However, the first width W1 is not limited to this, and the first width W1 may be of other dimensions. good too.

Further, in the document feeding device 20 of the present embodiment, a case in which the document feeding device 20 is applied to the document reading device 1 has been described, but the present invention is not limited to this, and can be applied to general sheet conveying devices. Similarly, in the present embodiment, the case where the document reading device 1 is applied to the image forming device 100 has been described, but the present invention is not limited to this, and can be applied to image reading devices in general.

REFERENCE SIGNS LIST 1 document reading device (image reading device), 3 document tray (supporting portion), 8 separation roller (separation rotator), 12 biasing spring (biasing means), 17 feeding roller (feeding rotation 18 Second reading unit (reading section) 20 Document feeding device (sheet conveying device) 31 First regulation plate (first regulation section) 32 Second regulation plate (second regulation section ), 52... First reading unit (reading portion) 61, 62, 63, 64... Regulating member 61a, 62a, 63a, 64a... Bearing portion 61b, 62b, 63b, 64b... Contact portion 65... Connection Part 66...Torsion coil spring (biasing member) 80...Conveying roller pair 81b...Roller (first roller) 82b...Roller part (second roller) 83...Rotating shaft 100...Image forming apparatus 101 Image forming unit Ar1 First area Ar2 Second area C1 Conveyance center D Document (sheet) D1 Document (first sheet) D2, D3 Document (second sheet) N Nip part W... Width direction W1... First width W2... Second width W3... Third width (second width) X... Conveying direction

Claims (10)

a conveying roller pair for conveying in the conveying direction a sheet including a first sheet having a first width and a second sheet having a second width wider than the first width;
a regulating position disposed on the upstream side in the conveying direction of the nip portion of the conveying roller pair and at which the leading edge of the second sheet conveyed toward the conveying roller pair abuts to regulate the conveying of the second sheet; a regulating member that is pressed against the leading edge of the second sheet and is movable to an allowable position where the second sheet is allowed to be conveyed;
a biasing member that biases the restricting member to the restricting position;
The regulating member is not arranged in a first area overlapping a width direction crossing the conveying direction with respect to an area through which the first sheet passes, and is the first area of the area through which the second sheet passes. is placed in a second region other than
A sheet conveying device characterized by: comprising a support for supporting the seat,
The support portion is provided movably in conjunction with each other in the width direction, and regulates the positions of the sheet supported by the support portion on both sides in the width direction. has
A center of conveyance of the first sheet when the first restricting portion and the second restricting portion restrict the first sheet overlaps the first area in the width direction,
2. The sheet conveying apparatus according to claim 1, wherein: A plurality of the regulating members are provided,
comprising a connecting portion in which a plurality of the regulating members are connected so as to be interlocked;
3. The sheet conveying apparatus according to claim 1, wherein: The first region has a length of 56 mm or more in the width direction,
4. The sheet conveying device according to any one of claims 1 to 3, characterized in that: The first width is 55 mm or less,
The sheet conveying apparatus according to any one of claims 1 to 4, characterized in that: The biasing member has a biasing force that bends and corrects the skew of the conveyed second sheet when the leading edge of the conveyed second sheet having a basis weight of 105 g/m ² or less comes into contact with the regulation member.
The sheet conveying apparatus according to any one of claims 1 to 5, characterized in that: The conveying roller pair has a first roller and a second roller that rotate in contact with each other at the nip portion, and a rotation shaft that supports the first roller,
The biasing member is a torsion coil spring provided coaxially with the rotating shaft,
The regulating member includes a bearing portion that is provided so as to be able to swing with respect to the rotating shaft, and the regulating position that is provided continuously with the bearing portion and overlaps the sheet conveying path by swinging of the bearing portion. and a contact portion that is movable to the allowable position retracted from the transport path, and moves against the biasing force of the torsion coil spring when moving from the restricted position to the allowable position.
The sheet conveying device according to any one of claims 1 to 6, characterized in that: a support that supports the seat;
a feeding rotator for feeding the uppermost sheet among the plurality of sheets supported by the supporting portion;
a separation rotator that separates sheets one by one when a plurality of sheets are fed by the feeding rotator;
The regulating member is arranged downstream of the separation rotator in the conveying direction, and regulates conveyance of the sheet conveyed by the separation rotator.
The sheet conveying device according to any one of claims 1 to 7, characterized in that: A sheet conveying device according to any one of claims 1 to 8;
a reading unit that reads an image of the sheet conveyed by the sheet conveying device;
An image reading device characterized by: an image reading device according to claim 9;
an image forming unit that forms an image on a recording material based on the image read by the image reading device;
An image forming apparatus characterized by:

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