JP6647828B2 - Paper transport device and image reading device - Google Patents

Description

  The present invention relates to a sheet conveying device provided along a conveying path and having a sheet detecting member for detecting a position of a sheet, and an image reading device.

  In a sheet conveying device used in an image forming apparatus, a sheet is conveyed by a plurality of rollers provided along a sheet conveying path. When a plurality of sheets are stacked in a sheet conveying device, a double feed such that the sheets are conveyed in an overlapping state may occur, and a method for solving the problem has been proposed (for example, Patent Document 1).

  Further, when the paper is transported, the leading end of the paper may be inclined obliquely to the transport direction, and as a result, there may be a problem in image formation such as image inclination. When transporting paper, the shape of the paper transport path is also affected.If a curved portion is provided, various problems may occur. It was a difficult task to avoid, such as an increase in the size of the device.

JP 2009-298599 A

  In the sheet feeding apparatus described in Patent Document 1, a stacker for stacking sheets, a sheet feeding unit for separating and feeding the sheets, a sheet conveyance path for guiding the sheets, a registration unit for temporarily waiting the sheets, a registration unit A sheet feeding unit that feeds the sheet from the unit to the processing position; and a double feed detection sensor that detects sheet overlap. The sheet conveying path is composed of a pair of guide members, and the pair of guide members is provided with pressing means for deflecting the sheet toward one of the guide members. In the above-described sheet feeding apparatus, an ultrasonic sensor is used as the double feed detection sensor. However, since the detection is performed without contacting the sheet, there is a possibility that the sheet is erroneously detected as another object. On the other hand, apart from the double feed detection sensor, a sheet detecting member that comes into contact with the sheet and detects the leading edge or the trailing edge of the sheet may be provided in the transport path. In this case, when the sheet is pressed, there is a concern that a difference in feed amount occurs at both ends of the sheet, and that the leading end is inclined.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to provide a paper transport device and an image reading device that can improve the inclination accuracy of the leading edge of a paper.

The paper transport device according to the present invention includes a transport path on which the paper is transported, a paper detection member provided along the transport path, for detecting the position of the paper, and a transport roller for nipping and transporting the paper. A paper transport device, wherein the transport path is provided with a pair of transport guides facing each other at an interval, and a pressing member that presses the paper toward one of the transport guides. The pressing member protrudes from the pair of conveyance guides so as to block a conveyance path, extends in a conveyance direction of the sheet, is disposed at a position overlapping the sheet detection member in the conveyance direction, and has a width of the sheet. The transport rollers are separated so as not to overlap in the direction, and the transport roller is provided in a plurality on the downstream side of the sheet detecting member in the transport direction and is spaced apart in the width direction, and the pressing member and the transport roller are And said Characterized in that it is provided in a position overlapping in the direction.

  In the paper transporting device according to the present invention, the pressing member and the paper detecting member may be provided in a curved portion of the transport path in which the transport direction is curved.

In the paper conveying apparatus according to the present invention, the transport roller includes a rotating body that contacts the sheet, may be configured to have a structure and a roller shaft for rotatably supporting the rotating body.

  In the paper transport device according to the present invention, the pressing member and the paper detecting member may be configured to press the paper toward the same transport guide.

  In the paper transport device according to the present invention, the pressing member and the paper detecting member may be configured to press the paper toward different transport guides.

  In the sheet transporting device according to the present invention, a plurality of the pressing members are provided apart from each other in the width direction, and at least two of the plurality of pressing members are symmetric with respect to a center line in the width direction of the paper. It may be configured to be arranged at a position.

  In the sheet transport device according to the present invention, the pressing member may be arranged adjacent to the sheet detecting member in the width direction.

  In the paper transport device according to the present invention, the pressing member may be formed of a resin film.

  An image reading device according to the present invention includes the sheet conveying device according to the present invention, and further includes an image forming unit that forms an image on a sheet conveyed by the sheet conveying device.

  According to the present invention, by providing the pressing member in the transport path, the inclination accuracy of the leading end of the sheet can be improved. In other words, the sheet is pressed by the sheet detecting member provided in the conveying path so as to be pressed against one of the conveying guides, but is also pressed by the pressing member, so that the sheet is fed at both ends in the width direction of the sheet. The difference in the amount is reduced, and the inclination of the leading end of the sheet can be suppressed.

FIG. 1 is a schematic side view of an image forming apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic side view illustrating an image reading device and a document conveying device. FIG. 3 is an enlarged side view showing the vicinity of a conveyance path in FIG. 2 in an enlarged manner. It is a schematic side view extracting and showing the vicinity of an actuator and a pressing member. FIG. 5 is an explanatory diagram viewed from the outer periphery guide side in FIG. 4. FIG. 2 is a schematic side view illustrating a state in which a sheet is being conveyed by the sheet conveyance device according to the first embodiment of the present invention. FIG. 9 is a schematic side view illustrating a state in which a sheet is being conveyed in a comparative example. FIG. 8 is an explanatory diagram viewed from the outer periphery guide side in FIG. 7. FIG. 9 is a schematic side view of the sheet conveying device according to a second embodiment of the present invention, in which the vicinity of an actuator and a pressing member is extracted and shown. FIG. 9 is a schematic side view illustrating a state in which a sheet is being conveyed by a sheet conveying device according to a second embodiment of the present invention. FIG. 14 is a schematic side view illustrating the vicinity of an actuator and a pressing member in a sheet transporting device according to a third embodiment of the present invention. FIG. 12 is an explanatory diagram viewed from the outer periphery guide side in FIG. 11. FIG. 14 is a schematic side view illustrating the vicinity of an actuator and a pressing member in a sheet transporting device according to a fourth embodiment of the present invention. It is explanatory drawing seen from the outer periphery guide side of FIG.

(1st Embodiment)
Hereinafter, an image forming apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view of the image forming apparatus according to the first embodiment of the present invention.

  The image forming apparatus 100 is a multifunction peripheral having a scanner function, a copying function, a printer function, a facsimile function, and the like. The image forming apparatus 100 transmits an image of a document (paper) read by the image reading device 41 to the outside, or ), And forms an image of a read document or an image received from the outside on a sheet in color or in a single color (corresponding to a copying function, a printer function, and a facsimile function).

  Above the image reading device 41, there is provided a sheet transporting device 50 (ADF) supported to be openable and closable with respect to the image reading device 41. When the sheet transport device 50 is opened, the document table 44 above the image reading device 41 is opened, and the document can be placed manually. Further, the paper transporting device 50 automatically transports the document placed on the document tray 51 onto the image reading device 41. The image reading device 41 reads a placed document or a document transported from the paper transport device 50 to generate image data. Note that the sheet transport device 50 and the image reading device 41 will be described in detail with reference to FIG.

  The image forming apparatus 100 includes an optical scanning device 1, a developing device 2, a photosensitive drum 3, a drum cleaning device 4, a charger 5, an intermediate transfer belt 7, a fixing device 12, a paper transport path S, a paper cassette 10, a stacking tray. 15 and so on.

  In the image forming apparatus 100, image data corresponding to a color image using each color of black (K), cyan (C), magenta (M), and yellow (Y) or a monochrome image using a single color (for example, black) Is treated. The image forming apparatus 100 is provided with four developing devices 2, four photosensitive drums 3, four drum cleaning devices 4, and four chargers 5 for forming four types of toner images, each of which has black, cyan, magenta, And yellow, four image stations Pa, Pb, Pc, and Pd are configured.

  The drum cleaning device 4 removes and collects residual toner on the surface of the photosensitive drum 3. The charger 5 uniformly charges the surface of the photosensitive drum 3 to a predetermined potential. The optical scanning device 1 exposes the surface of the photosensitive drum 3 to form an electrostatic latent image. The developing device 2 develops the electrostatic latent image on the surface of the photoconductor drum 3 to form a toner image on the surface of the photoconductor drum 3. Through the series of operations described above, a toner image of each color is formed on the surface of each photoconductor drum 3.

  An intermediate transfer roller 6 is disposed above the photosensitive drum 3 via an intermediate transfer belt 7. The intermediate transfer belt 7 circulates in the direction of arrow C, removes and collects residual toner by the belt cleaning device 9, and sequentially transfers and superimposes the toner images of each color formed on the surface of each photoconductor drum 3. Thus, a color toner image is formed on the surface of the intermediate transfer belt 7.

  The transfer roller 11 a of the secondary transfer device 11 has a nip area formed between the transfer roller 11 a and the intermediate transfer belt 7, and transports the paper conveyed through the paper transport path S while sandwiching the paper in the nip area. When the paper passes through the nip area, the toner image on the surface of the intermediate transfer belt 7 is transferred and conveyed to the fixing device 12.

  The fixing device 12 includes a fixing roller 31 and a pressure roller 32 that rotate while sandwiching a sheet. The fixing device 12 heats and presses the sheet on which the toner image has been transferred between the fixing roller 31 and the pressure roller 32 to fix the toner image on the sheet.

  The paper feed cassette 10 is a cassette for storing sheets used for image formation, and is provided below the optical scanning device 1. The sheet is pulled out of the sheet cassette 10 by the sheet pickup roller 16, conveyed through the sheet conveying path S, passes through the secondary transfer device 11 and the fixing device 12, and is transferred to the stack tray 15 via the sheet discharging roller 17. It is carried out. After temporarily stopping the paper and aligning the leading edge of the paper, the paper is conveyed to the paper transport path S in accordance with the transfer timing of the color toner image in the nip area between the intermediate transfer belt 7 and the transfer roller 11a. A paper registration roller 14 for starting transport, a paper transport roller 13 for prompting transport of the paper, and a paper discharge roller 17 are arranged.

  When performing image formation not only on the front side but also on the back side of the sheet, the sheet is conveyed in the reverse direction from the discharge roller 17 to the sheet reversing path Sr, and the sheet is turned over. 14, the image is formed on the back side in the same manner as the front side, and the sheet is carried out to the stacking tray 15.

  FIG. 2 is a schematic side view showing the image reading apparatus and the document conveying apparatus, and FIG. 3 is an enlarged side view showing the vicinity of the conveying path in FIG. 2 in an enlarged manner.

  The image reading device 41 includes a document reading glass 43, a document table 44, a first scanning unit 45, a second scanning unit 46, an imaging lens 47, a document reading unit 48, and the like. The document reading glass 43 and the document table 44 are provided on the upper surface of the image reading device 41. The first scanning unit 45 is located below the document reading glass 43 or the document table 44 and moves along the document table 44. The first scanning unit 45 exposes the document on the document reading glass 43 or the document table 44 and guides the reflected light to the second scanning unit 46. The second scanning unit 46 guides the reflected light from the document to the imaging lens 47 while moving following the first scanning unit 45. The imaging lens 47 condenses the reflected light from the document on the document reading unit 48 and forms an image on the document surface on the document reading unit 48. The document reading unit 48 is a charge coupled device (CCD) and generates image data based on the read document image.

  Further, the image reading device 41 can read a document being conveyed by the sheet conveying device 50. In this case, the first scanning unit 45 stops below the document reading glass 43 and exposes a document passing between the document reading glass 43 and the reading guide plate 54 of the sheet conveying device 50.

  In the paper transport device 50, the documents stacked on the document tray 51 are supplied to a transport path 53 via a pickup roller 61. In the transport path 53, the image is read by the image reading device 41 via a pickup roller 61, a paper supply roller 62, a registration roller 63, a pre-reading roller 64, a post-reading roller 65, and a discharge roller 66 in order from the document tray 51 side. Is discharged to the paper discharge tray 52. The transport path 53 is provided with a reverse transport path 53r branched between a post-read roller 65 and a discharge roller 66. The reverse transport path 53r is a transport path between the paper feed roller 62 and the registration roller 63. Merges with 53. As described above, the paper transport device 50 includes, as transport rollers for nipping and transporting the paper, the pickup roller 61, the paper feed roller 62, the registration roller 63, the pre-read roller 64, and the post-read roller provided along the transport path. A roller 65 and a discharge roller 66 are provided. The transport path 53 includes a pair of transport guides 57 facing each other at an interval. That is, the sheet is transported in the area sandwiched between the pair of transport guides 57.

  The registration roller 63 sends the document to the pre-reading roller 64 after aligning the leading ends of the conveyed document. A reading guide plate 54 facing the document reading glass 43 is provided between the pre-reading roller 64 and the post-reading roller 65. A document pressing plate 56 is provided on the lower surface of the sheet conveying device 50 so as to face the document table 44. The document pressing plate 56 is placed on the document table 44 when the sheet conveying device 50 is closed. The originals so that they do not move.

  When reading the back side of the document, the intermediate tray 55 is rotated around the tray shaft 55a as shown by a two-dot chain line, the document discharged from the discharge roller 66 is received on the intermediate tray 55, and the discharge roller 66 is Stop. Then, by rotating the discharge roller 66 in the reverse direction, the document returned to the transport path 53 is guided to the registration roller 63 through the reverse transport path 53r, and passes over the document reading glass 43 with the front and back reversed. .

  The transport path 53 has a substantially U-shaped curved shape, and a curved portion in which the paper transport direction H (see FIG. 4 described later) is curved between the registration roller 63 and the pre-reading roller 64. ing. Between the registration roller 63 and the pre-reading roller 64, an actuator 80 (an example of a lever and a sheet detecting member) for detecting the position of the sheet and a pressing member 70 for pressing the sheet are provided. In addition, the actuator 80 and the pressing member 70 will be described in detail with reference to FIGS. For the sake of explanation, the inner peripheral side of the pair of transport guides 57 may be referred to as an inner peripheral guide 57a, and the outer peripheral side may be referred to as an outer peripheral guide 57b.

  Next, the arrangement and shape of the actuator 80 and the pressing member 70 will be described with reference to the drawings.

  FIG. 4 is a schematic side view extracting and showing the vicinity of the actuator and the pressing member.

  The pressing member 70 (outer mylar 70 a) is formed of a resin film, and has an upper end (a pressing upper end 71) fixed to one of the pair of transport guides 57 and extends in the transport direction H. In the present embodiment, the pressing upper end 71 is fixed to the inner peripheral guide 57a, and is curved so as to approach the outer peripheral guide 57b toward the lower end (the pressing lower end 72). By using a flexible resin film as the material of the pressing member 70, the pressing member 70 can maintain its original shape without securing flexibility and without being bent by deformation or the like.

  The actuator 80 (inward turning lever 80a) includes a detection shaft 81 supported by one of the pair of conveyance guides 57, and a detection protrusion 82 projecting from the detection shaft 81 and blocking the conveyance path 53. The detection protrusion 82 rotates around the detection shaft 81 by being pressed by the conveyed sheet P, and a gap for the sheet P to pass therethrough is provided. In the present embodiment, the detection shaft 81 is supported by the outer circumference guide 57b, and the detection projection 82 protrudes toward the inner circumference guide 57a. The pressing member 70 and the actuator 80 are arranged at positions where they overlap in the transport direction H. Specifically, the actuator 80 is provided between the pressing upper end 71 and the pressing lower end 72 in the transport direction H.

  FIG. 5 is an explanatory diagram viewed from the outer periphery guide side in FIG. Note that FIG. 5 shows a state where the curved surface is expanded in a plane and the outer peripheral guide 57b is omitted in consideration of the legibility of the drawing.

  The registration roller 63 includes a registration rotating body 63a (rotating body) and a registration roller shaft 63b (roller shaft). Two registration rotating bodies 63a are fixed to the registration roller shaft 63b so as to be separated from each other, and both ends thereof are rotatably supported by the sheet conveying device 50. The pre-reading roller 64, like the registration roller 63, includes a pre-reading rotator 64a and a pre-reading roller shaft 64b. Detailed description of the transport rollers other than the registration roller 63 and the pre-reading roller 64 is omitted, but similar to the registration roller 63 and the like, a structure in which a rotating body is rotatably supported by a roller shaft may be used. . Further, a corresponding driven roller is provided on the transport roller, and the paper P is sandwiched between the driven roller and a pair of driven rollers.

  In the width direction W of the paper P, a direction (left direction in FIG. 5) toward one end (first end P1) of the paper P is referred to as a first width direction W1, and the other end (the first The direction toward the second end P2 (rightward in FIG. 5) may be referred to as a second width direction W2. In addition, rotating members of the conveying rollers such as the registration rotating member 63a and the pre-reading rotating member 64a may be collectively referred to as a rotating member.

  In the sheet conveying device 50, a center line CL in the conveying direction H of the sheet P is set, and the positions of the rotating body and the pressing member 70 are determined based on the center line CL. The two rotating bodies of the transport roller are arranged near the first end P1 and near the second end P2, respectively, and the whole rotating body is provided at a position overlapping the sheet P in the width direction W. In the present embodiment, two pressing members 70 are provided apart from each other in the width direction W, and each of the pressing members 70 is disposed at a position overlapping the rotating body in the width direction W. Specifically, the rotating body and the pressing member 70 provided on the first end P1 side are disposed on the first auxiliary line SL1 parallel to the center line CL, and provided on the second end P2 side. The rotating body and the pressing member 70 are arranged on a second auxiliary line SL2 parallel to the center line CL. The two pressing members 70 are arranged at positions symmetrical with respect to the center line CL in the width direction W. That is, the first pressing width MW1 from the center line CL to the first auxiliary line SL1 is the same as the second pressing width MW2 from the center line CL to the second auxiliary line SL2.

  The actuator 80 is provided so as not to overlap with the pressing member 70 in the width direction W, and is disposed between the center line CL and the first auxiliary line SL1. In the present embodiment, the actuator 80 is disposed closer to the first end P1 than the center line CL, but is not limited to this, and may be disposed closer to the second end P2.

  The sheet P shown in FIG. 5 has the smallest size among the sheets conveyed by the sheet conveying device 50, and the sheet conveying device 50 can convey a sheet having a larger size. Even when a sheet of different size is conveyed, the sheet conveying device 50 conveys the sheet such that the center line CL coincides with the center of the sheet in the width direction W.

  As described above, the pressing member 70 and the actuator 80 press the conveyed sheet P when passing between the registration roller 63 and the pre-reading roller 64. Hereinafter, a path through which the sheet P passes will be described with reference to the drawings.

  FIG. 6 is a schematic side view illustrating a state in which a sheet is being conveyed by the sheet conveying device according to the first embodiment of the present invention.

  The sheet P conveyed from the registration roller 63 is pressed by the pressing member 70, and passes through the outer periphery guide 57b of the conveyance path 53 (outward rotation). An actuator 80 is provided in the middle of being conveyed along the pressing member 70, and the sheet P is pressed by the pressing member 70 toward the inner peripheral guide 57a. At this time, since both ends of the first end P1 and the second end P2 in the width direction W are pressed toward the outer periphery guide 57b, the sheet P is not affected by the actuator 80 and is not affected by the actuator 80. The sheet is conveyed to the pre-reading roller 64 in a state where it is regulated to pass through the outer circumference.

  Next, for comparison with the present invention, a comparative example showing a case without the pressing member 70 will be described with reference to the drawings.

  FIG. 7 is a schematic side view showing a state in which a sheet is being conveyed in the comparative example, and FIG. 8 is an explanatory diagram viewed from the outer periphery guide side in FIG. In addition, FIG. 8 shows a state in which the curved surface is expanded in a plane and the outer periphery guide 57b is omitted in consideration of the legibility of the drawing.

  The comparative example is different from the first embodiment in that the pressing member 70 is not provided. 7 and 8, the virtual paper VP is indicated by a two-dot chain line as the paper conveyed in the comparative example. For the sake of explanation, as shown in FIG. 8, the end of the virtual paper VP on the first width direction W1 side is referred to as a first virtual end VP1, and the end of the virtual paper VP on the second width direction W2 side is referred to as a first. 2 may be referred to as a virtual end VP2.

  In FIG. 7, the virtual paper VP is being conveyed from the registration rollers 63. Here, in the transport path 53, the portion between the registration roller 63 and the pre-reading roller 64 is formed as a curved portion, so that the virtual paper VP can move outward (outward path VPb) or inward (inward path) of the transport path 53. VPa), the distance (running length) to the pre-read roller 64 differs. In FIG. 7, the virtual paper VP passes through the outer circumference due to its elasticity. Then, when the virtual paper VP reaches the actuator 80, as shown in FIG. 8, the actuator 80 is arranged on the first width direction W1 side from the center line CL, so that the virtual paper VP Only the one virtual end VP1 is pressed toward the inner circumference guide 57a, and the second virtual end VP2 follows the path up to that. That is, in the comparative example, the first virtual end VP1 side passes through the inward path VPa, and the second virtual end VP2 side passes through the outer path VPb. Become.

  On the other hand, in the present embodiment, by providing the pressing member 70 in the transport path 53, the inclination accuracy of the leading end of the sheet P can be improved. That is, the sheet P is pressed by the actuator 80 provided in the transfer path 53 so as to be pressed against one of the transfer guides 57, but also pressed by the pressing member 70. , The difference in the feed amount at both ends is reduced, and the inclination of the leading end of the sheet P can be suppressed.

  Further, by providing the pressing member 70 and the actuator 80 in the curved portion, the inclination of the leading end of the sheet P can be further suppressed. In the curved portion, a difference in feed amount occurs depending on whether the sheet P follows the outer rotation or the inner rotation, so that the frequency of occurrence of the tip inclination increases. By pressing the sheet P at a location that causes such tip inclination, the difference in the feed amount can be eliminated.

  In addition, by providing the pressing member 70 at a position overlapping the rotating body in the width direction W, the pressing member 70 can reliably press the paper P. That is, since the rotating body is provided at a position in contact with the sheet P in the width direction W in consideration of the size of the sheet P, it is preferable that the pressing member 70 also determines the position based on the rotating body.

  In the present embodiment, the pressing member 70 and the actuator 80 are configured to press the paper toward different conveyance guides 57. In this case, the paper P is pressed from both sides of the front surface and the back surface. However, compared with the pressing member 70, the force of the actuator 80 pressing is very weak, and the paper P passes along the pressing side of the pressing member 70. In addition, it is possible to adopt a configuration in which a uniform path is traced without being affected by the warpage of the sheet P itself.

  Further, since at least two of the plurality of pressing members 70 are arranged at positions symmetrical with respect to the center line in the width direction W of the paper P, the feeding amounts at both ends of the paper P are surely aligned. be able to. In addition, it is preferable that the pressing members 70 provided at both ends in the width direction W are arranged at symmetrical positions.

  In the present embodiment, the configuration is such that the registration roller 63 is provided on the upstream side of the pressing member 70 in the transport direction H. However, the present invention is not limited to this, and the registration roller 63 may be provided on the downstream side of the pressing member 70. Good. That is, the pre-reading roller 64 may receive the sheet P and align the leading ends. Even in this case, by adjusting the feeding amount of the paper P by the pressing member 70, the inclination of the leading end can be suppressed within a range that can be corrected by the registration roller.

  Next, a sheet conveying device 50 according to a second embodiment to a fourth embodiment of the present invention will be described with reference to the drawings. It should be noted that the second to fourth embodiments differ from the first embodiment only in the arrangement of the actuator 80 and the pressing member 70. Therefore, only the main part drawings are shown, and other drawings are omitted.

(2nd Embodiment)
FIG. 9 is a schematic side view showing the vicinity of the actuator and the pressing member in the sheet transporting device according to the second embodiment of the present invention. Note that components having substantially the same functions as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The pressing member 70 (inner mylar 70b) has a pressing upper end 71 fixed to the outer peripheral guide 57b, and is curved so as to approach the inner peripheral guide 57a toward the pressing lower end 72. In the actuator 80 (outer rotation lever 80b), the detection shaft 81 is supported by the inner circumference guide 57a, and the detection protrusion 82 protrudes toward the outer circumference guide 57b. That is, the second embodiment is different from the first embodiment in that the transport guide 57 to which the actuator 80 and the pressing member 70 are fixed is replaced.

  FIG. 10 is a schematic side view illustrating a state where a sheet is being conveyed by the sheet conveying device according to the second embodiment of the present invention.

  The paper P conveyed from the registration roller 63 is pressed by the inner circumference mylar 70b, and passes through the inner side guide 57a of the conveyance path 53 (inner rotation). While being conveyed along the inner circumference mylar 70b, the outer circumference lever 57b presses the outer circumference guide 57b. At this time, the sheet P is regulated so as to pass through the inside of the conveyance path 53 without being affected by the outside rotation lever 80b because both ends in the width direction W are pressed toward the inner circumference guide 57a. Is conveyed to the pre-reading roller 64.

(Third embodiment)
FIG. 11 is a schematic side view showing the vicinity of the actuator and the pressing member in the paper transporting device according to the third embodiment of the present invention, and FIG. 12 is an explanatory diagram viewed from the outer peripheral guide side in FIG. It is. FIG. 12 shows a state where the curved surface is expanded in a plane and the outer peripheral guide 57b is omitted in consideration of the legibility of the drawing. Note that components having substantially the same functions as those of the first embodiment and the second embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the third embodiment, the pressing member 70 is an outer mylar 70a, and the actuator 80 is an outer lever 80b. That is, the pressing member 70 and the actuator 80 are configured to press the paper toward the same conveyance guide 57 side. As shown in FIG. 12, in the third embodiment, one pressing member 70 is provided at a position that coincides with the rotating body on the second end P2 side in the width direction W. The actuator 80 is disposed closer to the first end P1 than the center line CL. The paper P is turned outward by the actuator 80 on the first end P1 side, and is turned outward by the pressing member 70 on the second end P2 side. As a result, the paper P is pressed toward the same transport guide 57, so that the path followed by the paper P can be matched and the feed amount of the paper P can be uniformed.

(Fourth embodiment)
FIG. 13 is a schematic side view showing the vicinity of the actuator and the pressing member in the paper transporting device according to the fourth embodiment of the present invention, and FIG. 14 is an explanatory diagram viewed from the outer periphery guide side in FIG. It is. Note that FIG. 14 shows a state where the curved surface is expanded in a plane and the outer peripheral guide 57b is omitted in consideration of the legibility of the drawing. Note that components having substantially the same functions as those of the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  In the fourth embodiment, the pressing member 70 is an inward turning mylar 70b, and the actuator 80 is an inward turning lever 80a. In the fourth embodiment, as shown in FIG. 14, three pressing members 70 are provided. In addition to the two pressing members 70 provided at positions corresponding to the rotating body, the fourth pressing member 70 is disposed adjacent to the actuator. Provided adjacent mylar 70c. In FIG. 14, the adjacent mylar 70c is provided at a position indicated by a solid line on the second width direction W2 side of the actuator 80, but is not limited thereto, and is indicated by a dashed line on the first width direction W1 side of the actuator 80. It may be provided at a position. The number of the adjacent mylar 70c is not limited to one, and may be provided at both the position indicated by the solid line and the position indicated by the dashed line. Therefore, by providing the pressing member 70 adjacent to the actuator 80, a structure in which the change of the path of the sheet P by the actuator 80 is reliably restricted by the pressing member 70 can be achieved.

  The actuator 80 and the pressing member 70 are not limited to the above-described first to fourth embodiments, and the number, arrangement, and the like may be appropriately changed. Further, the configuration in which the actuator 80 and the pressing member 70 are arranged in the transport path 53 has been described, but the actuator 80 and the pressing member 70 may be applied to the sheet transport path S. That is, it is preferable that high accuracy is secured not only in image reading but also in image formation as to the inclination accuracy of the leading end of the sheet.

  It should be noted that the embodiment disclosed this time is an example in all respects, and is not a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not construed only by the embodiments described above, but is defined based on the description of the claims. Further, all changes within the meaning and scope equivalent to the claims are included.

Reference Signs List 50 Paper transport device 53 Transport path 57 Transport guide 57a Inner circumference guide 57b Outer circumference guide 63 Registration roller (an example of a transport roller)
64 Roller before reading (an example of a transport roller)
Reference Signs List 70 Pressing member 70a Outer mylar 70b Inner mylar 80 Actuator (an example of a paper detecting member)
80a Inner turning lever 80b Outer turning lever 100 Image forming apparatus H Transport direction P Paper W Width direction W1 First width direction W2 Second width direction

Claims (9)

A transport path along which the paper is transported,
A paper detection member provided along the transport path and configured to detect a position of a paper ,
And a transport roller for nipping and transporting the paper, comprising:
The transport path is provided with a pair of transport guides facing each other at an interval, and a pressing member that presses the sheet toward one transport guide,
The paper detection member projects from the pair of transport guides so as to block the transport path,
The pressing member is drawn along the transport direction of the sheet, to the sheet detecting member is disposed at a position overlapping with the transport direction, they are spaced apart so as not to overlap in the width direction of the paper,
A plurality of the transport rollers are provided on the downstream side of the sheet detecting member in the transport direction and are separated in the width direction.
The sheet conveying device according to claim 1, wherein the pressing member and the conveying roller are arranged at positions overlapping in the width direction . The paper transport device according to claim 1,
The paper transporting device according to claim 1, wherein the pressing member and the paper detecting member are provided in a curved portion of the transport path in which the transport direction is curved. The paper transport device according to claim 1 or 2, wherein:
The conveying roller, a sheet conveying device comprising a rotating body contacts the paper, that it is configured to include a roller shaft for rotatably supporting the rotating body. The paper transport device according to any one of claims 1 to 3, wherein
The sheet conveying device, wherein the pressing member and the sheet detecting member press the sheet toward the same conveying guide. The paper transport device according to any one of claims 1 to 3, wherein
The sheet conveying device, wherein the pressing member and the sheet detecting member press the sheet toward different conveying guides. The paper transport device according to claim 1, wherein
A plurality of the pressing members are provided apart from each other in the width direction,
At least two of the plurality of pressing members are arranged at positions symmetrical with respect to a center line in a width direction of the sheet. The paper transport device according to any one of claims 1 to 6, wherein:
The sheet conveying device according to claim 1, wherein the pressing member is disposed adjacent to the sheet detecting member in the width direction. The paper transport device according to claim 1, wherein
The sheet conveying device according to claim 1, wherein the pressing member is formed of a resin film.   An image reading apparatus, comprising: the sheet conveying device according to claim 1; and an image reading unit that reads an image of a sheet conveyed by the sheet conveying device.

Images