JP5520888B2 - Sheet material conveying apparatus and image forming apparatus having the same - Google Patents

Description

  The present invention relates to a sheet material conveying apparatus such as a copying machine, a printer, a facsimile, or a composite machine thereof, and an image forming apparatus including the same, and more particularly, to a sheet material conveying apparatus capable of jamming a sheet material and the sheet material conveying apparatus. The present invention relates to an image forming apparatus.

  2. Description of the Related Art Image forming apparatuses represented by copying machines, printers, and the like are provided with rollers in each transport path for transporting paper within the main body. In order to move the paper from the jam position by rotating the roller when the paper jam occurs, a jam processing member that is manually operated is provided in a part of these rollers.

  For example, the image forming apparatus disclosed in Patent Document 1 operates a jam processing lever in one direction when a jam occurs in a fixing unit including a fixing roller and a pressure roller for fixing a sheet on which a toner image is transferred. Jam processing is done. That is, it has a gear that rotates integrally with the fixing roller, and a jam processing lever that can be rotated, and the gear has a built-in one-way clutch that switches the presence or absence of power transmission according to the rotation direction of the jam processing lever. It is press-fitted into the sleeve, and the jam processing lever is provided integrally with the sleeve. When the jam handling lever is rotated in one direction, the rotational force is transmitted by the one-way clutch and the gear is also rotated. Accordingly, the fixing roller rotates, and the paper sandwiched between the fixing roller and the pressure roller is discharged from the fixing unit. When the jam processing lever is rotated in the reverse direction, the rotational force is not transmitted to the gear by the one-way clutch, the fixing roller remains stopped, and the paper is not conveyed in the reverse direction.

JP-A-7-319315 (paragraphs [0015] to [0024], FIG. 2)

  2. Description of the Related Art In recent years, a plurality of paper discharge units have been provided, for example, a face-down discharge unit that discharges paper with the image carrying surface down, and a face-up discharge unit that discharges paper with the image carrying surface up. Have been used. In the case where such a plurality of discharge units are provided, a plurality of conveyance paths from the fixing unit to each discharge unit are necessary to convey the sheet to each discharge unit, and a jam may occur in each conveyance path. In order to perform jam processing in each transport path, for example, if the jam processing lever described in Patent Document 1 is disposed in each transport path, a space for that is required, the apparatus becomes large, and the manufacturing cost increases. . In addition, there is a problem in that the operation becomes complicated because the conveyance path where the jammed paper remains is checked and the jam processing lever corresponding to the conveyance path is operated.

  The present invention has been made in order to solve the above-described problems. When a jam occurs in any one of a plurality of transport paths, the jam can be removed by operating one jam processing member. An object of the present invention is to provide a sheet material conveying device that can be released and an image forming apparatus including the sheet material conveying device.

  To achieve the above object, according to a first aspect of the present invention, there is provided an upstream conveying roller for conveying a sheet material in a sheet material conveying apparatus for manually conveying the sheet material and releasing the jam when the sheet material is jammed. A first conveyance roller and a second conveyance roller that are arranged downstream of the conveyance path of the sheet material with respect to the upstream conveyance roller and convey the sheet material, and the upstream conveyance roller and the first conveyance roller are normal. A first conveying path that conveys the sheet material from the upstream conveying roller to the first conveying roller by rotating in the direction, and the upstream by rotating the upstream conveying roller and the second conveying roller in the forward direction. A second conveying path that is different from the first conveying path that conveys the sheet material from the side conveying roller to the second conveying roller, and the first conveying roller rotates in the opposite direction to rotate the first conveying path. A third conveying path that conveys the sheet material from the first conveying roller to the second conveying roller by rotating the conveying roller in the forward direction, a jam processing member that allows the first conveying roller to rotate forward and backward, and When the first transport roller rotates forward or backward, the upstream transport roller and the second transport roller rotate in the forward direction so that the rotational force of the first transport roller is rotated by the output gear. A rotation direction switching mechanism including a gear train that transmits to the roller, and the first conveyance roller and the second conveyance path by rotating the first conveyance roller forward by an operation in one direction of the jam processing member. The sheet material stopped at the same time can be conveyed, and the first conveying roller is rotated in the reverse direction by operating the jam processing member in the other direction. Sheet material that has stopped in the third transport path is characterized in that the conveyable.

  Further, in the second invention, in the sheet material conveying apparatus, the rotation direction switching mechanism includes two gears incorporating a one-way clutch that switches transmission of rotational force according to a rotation direction of the first conveying roller; Two gear trains, a gear train in which the gear meshes evenly and a gear train in which the gear meshes oddly, and the one-way clutch applies the rotational force in the positive direction of the first transport roller to the one of the gear trains. The transmission is transmitted to the output gear through a gear train, and the other one-way clutch transmits the rotational force of the reverse direction of the first transport roller to the output gear through the other gear train.

  According to a third aspect of the present invention, in the sheet material conveying apparatus, the rotation direction switching mechanism meshes with the input gear rotated by the rotation of the first conveying roller, and is transmitted from the input gear. Two gears, a swing gear configured to be swingable between the first position and the second position by a rotational driving force, a gear train in which the gear meshes an odd number of times, and a gear train in which the gear meshes an even number of times When the first transport roller rotates forward, the swing gear swings to a first position, and the one gear train transmits a rotational force to the output gear. When the transport roller rotates in the reverse direction, the swing gear swings to the second position, and the other gear train transmits the rotational force to the output gear.

  According to a fourth aspect of the present invention, in the sheet material conveyance device, the output gear meshes with a gear provided coaxially with the second conveyance roller, and meshes with a gear provided coaxially with the upstream conveyance roller. It is characterized by doing.

  Moreover, in 5th invention, in said sheet | seat conveyance apparatus, the display member which displays the operation direction of the said jam processing member, The sheet | seat detection member which detects the presence or absence of the sheet | seat material in the said 1st-3rd conveyance path, , And an operation direction of the jam processing member is displayed on the display member based on a detection result of the sheet detection member.

  According to a sixth aspect of the present invention, in the sheet material conveying apparatus, the sheet detecting member includes a first sheet detecting member disposed in the vicinity of the upstream side of the first conveying path with respect to the first conveying roller. And when the first sheet detection member detects the sheet material, the display member displays an operation in one direction of the jam processing member, and then the rear end of the sheet material by the first sheet detection member. In response to the detection of passage, the display member displays an operation in the other direction of the jam processing member.

  According to a seventh aspect of the invention, there is provided an image forming apparatus including the sheet material conveying device having the above-described configuration.

  According to the first invention, when a jam occurs in the first transport path, when the jam handling member is operated in one direction, the first transport roller rotates forward, and the rotational force of the first transport roller is upstream by the gear train. By being transmitted to the side conveyance roller, the upstream side conveyance roller rotates forward, and the sheet material can be conveyed on the first conveyance path by the upstream side conveyance roller and the first conveyance roller. Further, when a jam occurs in the second transport path, when the jam processing member is operated in one direction, the rotational force of the first transport roller is transmitted to the upstream transport roller and the second transport roller by the gear train, The upstream conveyance roller and the second conveyance roller rotate in the forward direction, respectively, and the upstream conveyance roller and the second conveyance roller allow the sheet material to be conveyed on the second conveyance path. Further, when a jam occurs in the third transport path, when the jam handling member is operated in the other direction, the first transport roller rotates in the reverse direction, and the rotational force of the first transport roller is transmitted to the second transport roller by the gear train. Thus, the second conveyance roller rotates forward, and the sheet material can be conveyed on the third conveyance path by the first conveyance roller and the second conveyance roller. Therefore, even if a jam occurs in any one of the first to third conveyance paths, the jam can be released with one jam processing member, and the jam processing operation is simple. There is no need to dispose a member in each conveyance path, the apparatus is downsized, and the manufacturing cost can be reduced.

1 is a schematic diagram illustrating an image forming apparatus including a paper transport unit according to a first embodiment of the present invention. 1 is a schematic plan view showing first to third conveyance paths of a paper conveyance unit according to a first embodiment. The perspective view which shows the paper conveyance part provided with the drive mechanism which concerns on 1st Embodiment. The perspective view which shows the jam processing operation | movement of the 1st conveyance path or the 2nd conveyance path in the drive mechanism which concerns on 1st Embodiment. The perspective view which shows the jam processing operation | movement of the 3rd conveyance path in the drive mechanism which concerns on 1st Embodiment. The block diagram which displays the jam processing operation which concerns on 1st Embodiment Schematic side view showing the gear train of the drive mechanism according to the second embodiment Schematic top view which shows the gear train of the drive mechanism which concerns on 3rd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. Further, the use of the invention and the terms shown here are not limited thereto.

(First embodiment)
FIG. 1 is a schematic view showing an image forming apparatus according to the first embodiment of the present invention. The image forming apparatus 1 includes a rectangular parallelepiped apparatus main body 1a, and an image forming unit 10 is disposed at a substantially central portion in the apparatus main body 1a. The image forming unit 10 includes a photoconductor 11 that is an image carrier, and further, around the photoconductor 11 in order along the rotation direction (the arrow direction in the drawing), a charging unit 13, an exposure unit 12, and a developing unit. The unit 2, the transfer roller 55, the cleaning unit 14, and the charge removal unit 15 are provided. The supply of toner to the developing unit 2 is performed from a toner container (not shown). The cleaning unit 14 peels off and collects the toner remaining on the surface of the photoconductor 11, and the charge removal unit 15 removes residual charges on the surface of the photoconductor 11.

  When the surface of the photoconductor 11 is uniformly charged by the charging unit 13 with a predetermined polarity and potential, the exposure unit 12 is arranged on the photoconductor 11 on the basis of image data of a document read by a document reading device (not shown). Then, an electrostatic latent image of the original image is formed.

  The developing unit 2 supplies charged toner to the surface of the photoconductor 11 and develops the electrostatic latent image on the photoconductor 11 to form a toner image. The toner image is transferred onto a sheet, which is a sheet material, by a transfer roller 55. After the toner image is transferred to the paper, the toner remaining on the surface of the photoconductor 11 is cleaned and collected by the cleaning unit 14, and the residual charge on the surface of the photoconductor 11 is removed by the charge removing unit 15.

  The paper feed unit 46 is composed of paper feed cassettes 47 to 50 and the like. The paper feed cassettes 47 to 50 are arranged in the vertical direction at the bottom of the apparatus main body 1a, and sheets are stacked and stored in the paper feed cassettes 47 to 50. The paper is placed on the placement plate 47a of the paper feed cassette 47, and the paper on the placement plate 47a is sent out one by one to the paper transport path by the pickup roller 47b.

  The paper transport unit 70 is for transporting paper within the apparatus main body 1a, and includes a paper feed transport path 71, an image forming transport path 72, a post-fixing transport path 73, a branch transport path 74, and a reverse discharge. A transport path 77, a reverse transport path 75, and a re-transport path 76 are provided.

  The sheet feeding conveyance path 71 is a conveyance path from the sheet feeding unit 46 to the registration roller pair 53, and is formed to bend to the left from the middle while extending upward from the sheet feeding unit 46 on the right side of the apparatus main body 1a. The registration roller pair 53 is disposed on the right side of the transfer roller 55 and sends the paper toward the transfer roller 55 in synchronization with the timing of transferring the toner image onto the paper.

  The image forming conveyance path 72 is a conveyance path from the registration roller pair 53 to the fixing unit 18 and extends in the substantially horizontal direction of the apparatus main body 1a and is curved upward from the middle. An image forming unit 10 and a fixing unit 18 are disposed in the image forming conveyance path 72, and a toner image is transferred onto the sheet by the image forming unit 10, and the toner image transferred onto the sheet is transferred onto the sheet by the fixing unit 18. To be established.

  The post-fixing conveyance path 73 is a conveyance path extending upward from the fixing unit 18 to the branch conveyance path 74, and the post-fixing conveyance path 73 conveys the sheet on which the toner image is fixed to the branch conveyance path 74.

  The branch conveyance path 74 is a conveyance path for conveying the paper on which the toner image is fixed to the reverse discharge conveyance path 77 or the second discharge tray 67, and is curved to the right from the upstream conveyance roller pair 61 and is first curved. A first conveyance path that reaches the conveyance roller pair 62, a second conveyance path that curves leftward from the upstream conveyance roller pair 61 and reaches the second conveyance roller pair 63, and extends horizontally from the first conveyance roller pair 62. The third conveyance path reaches the second conveyance roller pair 63.

  The reverse discharge transport path 77 is a transport path for discharging the paper to the first discharge tray 66 or transporting the reverse paper to form a toner image on the back surface of the paper. In the middle of the reverse discharge transport path 77, the reverse transport path 75 joins from below.

  The reverse conveyance path 75 reverses the front and back of the paper and conveys the reversed paper to the reverse discharge conveyance path 77. The reverse conveyance path 75 branches from the post-fixing conveyance path 73 and extends rightward toward the reverse roller pair 57. Furthermore, it extends upward in a U shape from the pair of reverse rollers 57 and is joined to the reverse discharge conveyance path 77.

  The re-conveying path 76 conveys the sheet reversed by the reversing conveying path 75 from the reversing discharge conveying path 77 to the image forming conveying path 72. It merges with the conveyance path 71.

  When the paper supplied from the paper supply unit 46 is conveyed upward in the paper supply conveyance path 71 and further conveyed to the transfer roller 55 at the conveyance timing by the registration roller pair 53, the toner is transferred by the transfer roller 55. The image is transferred to the paper. The sheet on which the toner image is transferred is conveyed to the fixing unit 18 on the image forming conveyance path 72, and when heated and pressed by the fixing unit 18, the toner image is melted and fixed on the sheet. The sheet on which the toner image is fixed is discharged to the first discharge tray 66 by the first transfer roller pair 62 and the discharge roller pair 64 through the post-fixing transfer path 73 and the branch transfer path 74 (first transfer path). Alternatively, the sheet on which the toner image is fixed is discharged to the second discharge tray 67 by the second transfer roller pair 63 through the post-fixing transfer path 73 and the branch transfer path 74 (second transfer path).

  In the case of duplex printing, the paper fixed by the fixing unit 18 is conveyed from the post-fixing conveyance path 73 to the reverse conveyance path 75. Immediately before the trailing edge of the paper passes through the reverse roller pair 57 in the reverse conveyance path 75, the reverse roller pair 57 is reversely rotated so that the paper is switched back and the printing surface of the paper is turned upside down. Is sent to the reverse discharge conveyance path 77. The reversed paper is transported from the reverse discharge transport path 77 to the paper feed transport path 71 through the re-transport path 76 again. The paper conveyed to the image forming conveyance path 72 via the paper feeding conveyance path 71 is branched and conveyed when the toner image is transferred to the back surface thereof by the image forming unit 10 and the toner image is melted and fixed by the fixing unit 18. The paper is discharged to the first discharge tray 66 or the second discharge tray 67 through the conveyance path selected in the path 74.

  The structure of the branch conveyance path 74 is shown in FIG. 2 is a schematic plan view showing the branch conveyance path 74. FIG. 2A shows a state in which the sheet is conveyed on the first conveyance path, and FIG. 2B shows a condition in which the sheet is conveyed on the second conveyance path. Further, FIG. 2C shows a state in which the sheet is conveyed along the third conveyance path.

  As shown in FIG. 2A, the branch conveyance path 74 includes an upstream conveyance roller pair 61 having an upstream conveyance roller 61a and an upstream conveyance roller 61b, a first conveyance roller 62a, and a first conveyance roller 62b. A first conveyance roller pair 62 having a second conveyance roller 63a and a second conveyance roller 63b having a second conveyance roller 63b, a branching claw 21 for switching the conveyance direction of the paper, and the presence or absence of paper. An upstream sheet detection member 95, a first sheet detection member 96, and a second sheet detection member 97 are provided.

  The upstream transport roller 61a is rotated by a motor 98 or a jam processing member 94, which will be described later. When the upstream transport roller 61a rotates, the upstream transport roller 61b pressed against the upstream transport roller 61a is driven to rotate. The first transport roller 62a is rotated by the motor 98 or the jam processing member 94. When the first transport roller 62a rotates, the first transport roller 62b pressed against the first transport roller 62a is driven to rotate. Further, the second transport roller 63a is rotated by the motor 98 or the jam processing member 94, and when the second transport roller 63a rotates, the second transport roller 63b pressed against the second transport roller 63a is driven to rotate.

  The branch claw 21 has a triangular shape and is pivotally supported at a position shown in FIG. 2A or 2B so as to be swingable. When the branching claw 21 is held at the position shown in FIG. 2A, the paper can pass through the conveyance path 78 formed by the upstream conveyance roller pair 61 and the first conveyance roller pair 62, and The sheet can pass through the conveyance path 80 formed by the first conveyance roller pair 62 and the second conveyance roller pair 63 (see FIG. 3C). On the other hand, when the branching claw 21 is held at the position shown in FIG. 2B, the sheet can pass through the conveyance path 79 formed by the upstream conveyance roller pair 61 and the second conveyance roller pair 63. Become.

  When the branching claw 21 is held at the position of FIG. 2A and the upstream transport roller 61a and the first transport roller 62a rotate in the direction of arrow A, the paper is transported from the upstream transport roller pair 61 to the transport path. The first conveyance path P <b> 1 passing through 78 and going to the first conveyance roller pair 62 is conveyed. Accordingly, the sheet is transported from the post-fixing transport path 73 via the first transport path P1 to the reverse discharge transport path 77 (see FIG. 1) and discharged face down to the first discharge tray 66 (see FIG. 1). The

  When the branching claw 21 is held at the position shown in FIG. 2B and the upstream transport roller 61a and the second transport roller 63a rotate in the direction of arrow A, the paper is transported from the upstream transport roller pair 61 to the transport path. The second conveyance path P <b> 2 passing through 79 and toward the second conveyance roller pair 63 is conveyed. Accordingly, the sheet is discharged face-up from the post-fixing conveyance path 73 via the second conveyance path P2 to the second discharge tray 67 (see FIG. 1).

  When the branch claw 21 is held at the position of FIG. 2C, the first transport roller 62a rotates in the direction of arrow B, which is the reverse direction of the arrow A, and the second transport roller 63a rotates in the direction of arrow A. The sheet is transported on the second transport path P3 from the first transport roller pair 62 toward the second transport roller pair 63. Accordingly, the sheet is transported from the post-fixing transport path 73 to the first transport path P1, and the first transport roller 62a rotates in the arrow B direction after the trailing end of the sheet has passed the upstream transport roller pair 61. The sheet is transported through the third transport path P3 and discharged face down to the second discharge tray 67.

  The upstream paper detection member 95 is disposed in the vicinity of the downstream side where the two conveyance paths 78 and 79 overlap the upstream conveyance roller pair 61, and detects the passage of the leading edge or the trailing edge of the paper to thereby detect both conveyance paths 78. 79, the presence or absence of paper is detected. The upstream sheet detection member 95 includes a cantilever supported so as to be able to enter and exit on the conveyance path, and an optical sensor that emits light and receives the light. When the sheet passes through one end of the cantilever, the cantilever swings, and the other end of the cantilever blocks the light emitted from the optical sensor by the swinging of the cantilever, so that the upstream sheet detection member 95 detects the presence or absence of the sheet. Note that the upstream side paper detection member 95 may be formed of a reflective optical sensor. In the case of this optical sensor, the presence or absence of the paper is detected by irradiating the conveyance path with light and receiving the reflected light from the paper passing so as to block the light of the optical sensor. Further, the upstream side sheet detection member 95 may be configured by an optical sensor including a light projecting unit and a light receiving unit that are disposed to face each other with the conveyance path interposed therebetween.

  The first paper detection member 96 is disposed in the vicinity of the upstream side of the first transport path P1 with respect to the first transport roller pair 62, and detects the passage of the front end or the rear end of the paper to thereby detect the first transport roller pair 62. The presence or absence of paper in the vicinity of is detected. The first paper detection member 96 has the same configuration as the upstream paper detection member 95 described above.

  The second paper detection member 97 is disposed in the vicinity of the downstream side of the second transport path P2 with respect to the second transport roller pair 63, and detects the passage of the front end or the rear end of the paper to thereby detect the second transport roller pair 63. The presence or absence of paper in the vicinity of is detected. The second paper detection member 97 has the same configuration as the upstream paper detection member 95 described above.

  The paper jam position is detected based on the detection result of the presence / absence of the paper by the paper detection members 95 to 97. Alternatively, based on the detection result of the presence / absence of the paper by the paper detection members 95 to 97, information on the paper such as the paper size and the printing mode, and the operation instruction, the rotation driving of each of the transport rollers 61a to 63a and the swinging of the branch claw 21 are performed. The position is controlled and the paper is transported.

  For example, when paper is discharged face-down to the first discharge tray 66 (see FIG. 1), the branching claw 21 is driven and held to the position of FIG. 2A, and the upstream-side transport roller 61a and the first transport The roller 62a is rotated in the direction of arrow A. Further, when the sheet is discharged face-up to the second discharge tray 67, the branch claw 21 is driven and held to the position of FIG. 2B, and the upstream-side transport roller 61a and the second transport roller 63a are moved to the arrow A. Rotation driven in the direction.

  Further, when the sheet is discharged face-down to the second discharge tray 67, the branching claw 21 is driven and held to the position of FIG. 2A, and the upstream conveyance roller 61a and the first conveyance roller 62a are moved in the direction of arrow A. Driven by rotation. The paper is transported along the first transport path P1 by the rotation of the transport rollers 61a and 62a. After the upstream sheet detection member 95 detects the passage of the trailing edge of the sheet, when the time required for the trailing edge of the sheet conveyed on the first conveyance path P1 to come before the first conveyance roller pair 62 has elapsed, The rotation direction of the first transport roller 62a can be switched from the arrow A direction to the arrow B direction (see FIG. 2C). The first transport roller 62a is rotationally driven in the direction of arrow B and the second transport roller 63a is rotationally driven in the direction of arrow A, whereby the paper is transported through the third transport path P3 and face-down to the second discharge tray 67. It is discharged at.

  The transport rollers 61a to 63a are rotated by the driving mechanism shown in FIG. FIG. 3 is a perspective view showing a branch conveyance path provided with a drive mechanism.

  The drive mechanism is constituted by a gear train and is driven by a motor 98 or a jam processing member 94. The motor 98 is disposed rearward in the longitudinal direction (perpendicular to the paper transport direction) and rotates the transport rollers 61a to 63a via a drive mechanism. As a result, the fixed sheet is discharged to the first discharge tray 66 or the second discharge tray 67. The jam processing member 94 is disposed forward in the longitudinal direction, and rotates each of the transport rollers 61a to 63a via a drive mechanism. As a result, the jammed paper can be manually removed from the conveyance path.

  The jam handling member 94 is constituted by a turning knob supported so as to be rotatable in the forward direction or the reverse direction, and a first gear 81 is fixed to the shaft of the turning knob.

  A predetermined number (four in this case) of the first transport rollers 62a are fixed to the first roller shaft 62c extending in the longitudinal direction. A second gear 82 is fixed to one end of the first roller shaft 62c, and a third gear 83 is fixed to the other end. The second gear 82 meshes with the first gear 81 of the jam handling member 94. When the jam handling member 94 is rotated, the first transport roller 62a rotates through the first roller shaft 62c by the meshing of the first gear 81 and the second gear 82.

  The third gear 83 meshes with the fourth gear 84, and the fourth gear 84 meshes with the fifth gear 85. The fifth gear 85 is disposed so as to be integrally rotatable with the sixth gear 86 and the gear shaft. The sixth gear 86 incorporates a one-way clutch. When the third gear 83 (first transport roller 62a) rotates in the A direction (see FIG. 2 (a)), the one-way clutch of the sixth gear 86 uses the torque of the gear shaft by the fifth gear 85 as the sixth gear. 86, but when the third gear 83 (the first transport roller 62a) rotates in the B direction (see FIG. 2C), the rotational force of the gear shaft by the fifth gear 85 is transmitted to the sixth gear 86. It is the composition to do.

  The fifth gear 85 meshes with the seventh gear 87, and the seventh gear 87 meshes with the eighth gear 88, while the sixth gear 86 meshes with the ninth gear 89. The eighth gear 88 and the ninth gear 89 are disposed so as to be integrally rotatable with the gear shaft. The eighth gear 88 incorporates a one-way clutch. The one-way clutch of the eighth gear 88 uses the rotational force of the eighth gear 88 when the third gear 83 (first transport roller 62a) rotates in the A direction (see FIG. 2A). While transmitting to the gear shaft, when the third gear 83 (first transport roller 62a) rotates in the B direction (see FIG. 2C), the rotational force of the eighth gear 88 is applied to the gear shaft of the eighth gear 88. It is configured not to transmit.

  Accordingly, the ninth gear 89 is rotated by the eighth gear 88 disposed coaxially or by the sixth gear 86 meshing with the ninth gear 89. The ninth gear 89 meshes with the tenth gear 90 and meshes with the eleventh gear 91.

  A predetermined number (four in this case) of the second transport rollers 63a are fixed to the second roller shaft 63c extending in the longitudinal direction. A tenth gear 90 is fixed to one end of the second roller shaft 63c, and when the tenth gear 90 is driven to rotate, the second transport roller 63a rotates via the second roller shaft 63c.

  A predetermined number (four in this case) of the upstream conveying rollers 61a are fixed to the upstream roller shaft 61c extending in the longitudinal direction. An eleventh gear 91 is fixed to one end of the upstream roller shaft 61c. When the eleventh gear 91 is driven to rotate, the upstream transport roller 61a rotates via the upstream roller shaft 61c.

  These first to eleventh gears 81 to 91 are spur gears. When the jam handling member 94 is rotated, the first transport roller 62a rotates and the third gear 83 rotates through the engagement of the first gear 81 and the second gear 82 and the first roller shaft 62c. The rotational force of the third gear 83 is transmitted to the fourth gear 84 to the ninth gear 89. Due to the rotation of the ninth gear 89 that is the output gear, the second transport roller 63a rotates through the tenth gear 90, and the upstream transport roller 61a rotates through the eleventh gear 91. As described above, the ninth gear 89 meshes with the tenth gear 90 provided coaxially with the second transport roller 63a, and meshes with the eleventh gear 91 provided coaxially with the upstream-side transport roller 61a. The drive mechanism is small in size without taking up a large space in the arrangement.

  still. The motor 98 has a motor gear 93 fixed to the motor shaft, and the motor gear 93 meshes with the fifth gear 85. Therefore, when the motor 98 is rotationally driven, the rotational force of the motor 98 is transmitted by the third to eleventh gears 83 to 91, and the first transport roller 62a, the second transport roller 63a, and the upstream transport roller 61a rotate.

  Depending on the rotation direction of the jam handling member 94 or the motor 98, the rotation directions of the first and second transport rollers 62a and 63a and the upstream transport roller 61a are switched as shown in FIG. 4 or FIG. 4 is a perspective view showing the rotation direction of each gear of the gear train by the operation in one direction of the jam processing member 94, and FIG. 5 shows each gear of the gear train by the operation in the other direction of the jam processing member 94. It is a perspective view which shows the rotation direction.

  As shown in FIG. 4, when the jam handling member 94 is rotated in one direction (counterclockwise direction in FIG. 3), the first transport roller 62a (see FIG. 3) rotates in the A direction (positive direction) and the second direction. The three gear 83 rotates in the A direction. The rotational force in the A direction of the third gear 83 is sequentially transmitted to the fourth gear 84, the fifth gear 85, the seventh gear 87, the eighth gear 88 incorporating the one-way clutch, and the ninth gear 89. At this time, the rotation direction of each gear rotates in the direction of the arrow shown in FIG. 4, so that the tenth gear 90 meshing with the ninth gear rotates in the A direction, and the second transport roller 63a (see FIG. 3) is A. Rotate in the direction (positive direction). In addition, the eleventh gear 91 that meshes with the ninth gear rotates in the A direction, and the upstream-side transport roller 61a (see FIG. 3) rotates in the A direction (forward direction).

  As shown in FIG. 5, when the jam handling member 94 is rotated in the other direction (clockwise direction in FIG. 3), the first transport roller 62a (see FIG. 3) rotates in the B direction (reverse direction) and the third direction. The gear 83 rotates in the B direction. The rotational force in the B direction of the third gear 83 is sequentially transmitted to the fourth gear 84, the fifth gear 85, the sixth gear 86 incorporating the one-way clutch, and the ninth gear 89. At this time, the rotation direction of each gear rotates in the direction shown in FIG. 5, so that the tenth gear 90 meshing with the ninth gear rotates in the A direction, and the second transport roller 63a (see FIG. 3) moves in the A direction. Rotate in the positive direction. In addition, the eleventh gear 91 that meshes with the ninth gear rotates in the A direction, and the upstream-side transport roller 61a (see FIG. 3) rotates in the A direction (forward direction).

  Here, the third gear 83, the fourth gear 84, the fifth gear 85, the seventh gear 87, and the eighth gear 88 that transmit the rotational force in FIG. 4 constitute one gear train. In this one gear train, the third gear 83 and the fourth gear 84 mesh, and the fourth gear 84 and the fifth gear 85, and the fifth gear 85 and the seventh gear 87. And the seventh gear 87 and the eighth gear 88 are engaged with each other for a total of four engagements. On the other hand, the third gear 83, the fourth gear 84, the fifth gear 85, and the sixth gear 86 that transmit the rotational force in FIG. 5 constitute the other gear train. In the other gear train, the third gear 83 and the fourth gear 84 mesh with each other, the fourth gear 84 and the fifth gear 85, and the sixth gear 86 and the ninth gear 89. It is configured to mesh with each other for a total of three times.

  As described above, the sixth gear 86 and the eighth gear 88 incorporating the one-way clutch, the gear train in which the gear meshes evenly, and the gear train in which the gear meshes oddly constitutes a rotation direction switching mechanism and rotates. The direction switching mechanism does not switch the rotation direction of the ninth gear 89 that is the output gear even if the rotation direction of the first transport roller 62a is switched. With this configuration, when the jam handling member 94 is rotated in one direction or the other direction, the rotation direction of the first transport roller 62a is switched to the A direction (forward direction) or the B direction (reverse direction), but the upstream transport roller 61a. And the second transport roller 63a rotate only in the A direction. It should be noted that one gear train may be engaged with an odd number of times and the other gear train may be engaged with an even number of times, and the number of meshes is not limited to 3 and 4, and may be appropriately determined depending on the configuration of the drive mechanism. Is set.

  Therefore, when a jam occurs in the first transport path P1 (see FIG. 2A), when the jam processing member 94 is operated in one direction, the upstream transport roller 61a and the first transport roller 62a rotate in the A direction. The jammed paper can be moved from the first transport path P1 toward the reverse discharge transport path 77 (see FIG. 1), and further, the jammed paper can be discharged to the first discharge tray 66 via the reverse discharge transport path 77. Further, when a jam occurs in the second transport path P2 (see FIG. 2B), when the jam processing member 94 is operated in one direction as described above, the upstream transport roller 61a and the second transport roller 63a are moved in the A direction. , The jammed paper moves from the second transport path P2 toward the second discharge tray 67 (see FIG. 1), and the jammed paper can be discharged to the second discharge tray 67 (see FIG. 1). On the other hand, when a jam occurs in the third transport path P3 (see FIG. 2C), when the jam processing member 94 is operated in the other direction, the first transport roller 62a rotates in the B direction and the second transport roller 63a. Rotates in the A direction, the jammed paper moves from the third conveyance path P3 toward the second discharge tray 67, and the jammed paper can be discharged to the second discharge tray 67.

  Thus, even if a jam occurs in any of the first to third transport paths P1 to P3, the jam can be released by one jam processing member 94, and the jam processing operation is simple. In addition, it is not necessary to dispose the jam processing member 94 in each conveyance path, the apparatus can be downsized, and the manufacturing cost can be reduced.

  FIG. 6 is a block diagram showing a jam handling operation. The paper detection members 95 to 97 detect the presence or absence of paper, and the detection result is input to the control unit 100 configured by a microcomputer or the like. When the paper detection members 95 to 97 detect the paper, the control unit 100 counts the paper detection time in the paper detection members 95 to 97, and determines that the paper is jammed if the detection time is a predetermined time or more. The display member 99 is configured by an operation panel including a liquid crystal element and an operation panel having a display unit, and displays an operation direction of the jam processing member 94 (see FIG. 3). For example, when a paper jam has occurred in the first transport path P1 or the second transport path P2, a display prompting a one-way operation is performed on the display member 99. Further, when a paper jam has occurred in the third transport path P3, a display for prompting the other direction operation is performed on the display member 99. As described above, even when the jam processing is performed at a plurality of places by one jam processing member 94, the operation direction of the jam processing member 94 is displayed on the display member 99, so that no erroneous operation is caused.

  When a paper jam has occurred in the first transport path P1, the jammed paper is discharged to the first discharge tray 66 via the reverse discharge transport path 77 (see FIG. 1), but the reverse discharge transport path 77 becomes longer. In the configuration, the jam processing takes time, and the operation of the jam processing becomes complicated. Therefore, the operation direction of the jam processing member 94 is displayed so that the paper jammed in the first transport path P1 is discharged to the second discharge tray 67 (see FIG. 1).

  That is, when the upstream sheet detection member 95 (see FIG. 2) and the first sheet detection member 96 detect a sheet for a predetermined time or more, the control unit 100 determines that a jam has occurred in the first conveyance path P1. The display member 99 performs a display indicating a one-way operation of the jam processing member 94. As a result of the user operating the jam processing member 94 in one direction, the first paper detection member 96 does not detect the jammed paper. That is, after the first paper detection member 96 detects the passage of the trailing edge of the jammed paper, the display member 99 displays the operation in the other direction of the jam processing member 94. When the user operates the jam processing member 94 in the other direction according to the display on the display member 99, the first transport roller pair 62 rotates in the B direction (reverse direction) and the second transport roller pair 63 moves in the A direction (forward direction). , The jammed paper is transported through the second transport path P2, and is easily discharged to the second discharge tray 67 in a short time.

  In the above-described embodiment, the operation direction of the jam processing member 94 is displayed on the display member 99 including the operation panel. Instead, a display member including a liquid crystal element on one surface of the jam processing member 94 is illustrated. 99 is arranged, and the operation direction is displayed on the display member 99, the operability is improved.

(Second Embodiment)
FIG. 7 is a schematic side view showing the arrangement of gears in the gear train according to the second embodiment. The second embodiment differs from the first embodiment in the arrangement of gears incorporating a one-way clutch, and the description of the same parts as in the first embodiment will be omitted hereinafter.

  Similar to the first embodiment, the third gear 83 is fixed to the first roller shaft 62c extending in the longitudinal direction from the first transport roller 62a (see FIG. 3), and is in the A direction according to the operation of the jam processing member 94. It rotates in the (forward direction) and B direction (reverse direction).

  The ninth gear 89 is an output gear of the gear train, and is provided coaxially with the tenth gear 90 provided coaxially with the second conveying roller 63a (see FIG. 3) and upstream conveying roller 61a (see FIG. 3). Is engaged with the eleventh gear 91. Accordingly, when the ninth gear 89 rotates, the second transport roller 63a and the upstream transport roller 61a rotate.

  Two gear trains are provided between the third gear 83 and the tenth gear 90. Each gear consists of a spur gear.

  One gear train is configured by arranging the gear 101, the gear 102, the gear 103, and the gear 104 in order of the third gear 83 and the third gear 83 in the direction of transmission of the rotational force. The gear 101 meshes with the third gear 83 and is disposed so as to be integrally rotatable with the gear 102 and the gear shaft, and further incorporates a one-way clutch. The one-way clutch of the gear 101 transmits the rotational force to the coaxial gear 102 when the third gear 83 rotates in the A direction, while the rotational force is transmitted to the coaxial gear 102 when the third gear 83 rotates in the B direction. The structure does not transmit to the gear 102.

  Further, in one gear train, the third gear 83 and the gear 101 are engaged, the gear 102 and the gear 103, the gear 103 and the gear 104, and the gear 104 and the ninth gear 89 are engaged. Are engaged with each other for a total of four engagements.

  Therefore, even if the third gear 83 rotates in the B direction, the one-way clutch of the gear 101 does not transmit the rotational force in the B direction of the third gear 83 to the gears subsequent to the gear 102. Does not rotate. However, when the third gear 83 rotates in the A direction, the rotational force is transmitted in the order of the gears 101 to 104 and the ninth gear 89. Accordingly, when the first transport roller 62a rotates in the A direction, the third gear 83 rotates in the A direction, and the tenth gear 90 rotates in the A direction via the gear train, so that the second transport roller 63a ( 3) rotates in the A direction (positive direction). When the first transport roller 62a rotates in the A direction, the 11th gear 91 rotates in the A direction via the gear train, so that the upstream transport roller 61a (see FIG. 3) moves in the A direction (positive direction). Rotate.

  The other gear train is configured by arranging a gear 105, a gear 106, and a gear 107 in the order of the third gear 83 and the third gear 83 in the direction of transmission of the rotational force. The gear 105 meshes with the third gear 83 and is disposed so as to be integrally rotatable with the gear 106 and the gear shaft, and further incorporates a one-way clutch. The one-way clutch of the gear 105 transmits the rotational force to the coaxial gear 106 when the third gear 83 rotates in the B direction, while the rotational force is transmitted to the coaxial gear 106 when the third gear 83 rotates in the A direction. It is configured not to transmit to the gear 106.

  In the other gear train, meshing is performed between the third gear 83 and the gear 105, meshing between the gear 106 and the gear 107, and coupling between the gear 107 and the ninth gear 89. It is configured to mesh with each other.

  Therefore, even if the third gear 83 rotates in the A direction, the rotational force in the A direction of the third gear 83 is not transmitted to the gears subsequent to the gear 106 by the one-way clutch of the gear 105. Does not rotate. However, when the third gear 83 rotates in the B direction, the rotational force is transmitted to the gears 105 to 107 and the ninth gear 89. Thus, when the first transport roller 62a rotates in the B direction, the third gear 83 rotates in the B direction, and the tenth gear 90 rotates in the A direction via the gear train, so that the second transport roller 63a ( 3) rotates in the A direction (positive direction). When the first transport roller 62a rotates in the B direction, the 11th gear 91 rotates in the A direction via the gear train, so that the upstream transport roller 61a (see FIG. 3) moves in the A direction (positive direction). Rotate.

  As described above, the gear 101 and the gear 105 incorporating the one-way clutch, the gear train meshing with the even number of times, and the gear train meshing with the odd number of times constitute the rotation direction switching mechanism, and the rotation direction switching mechanism is the first transport roller. Even if the rotation direction of 62a is switched, the ninth gear 89 as the output gear is rotated in the same direction. With this configuration, when the jam handling member 94 is rotated in one direction or the other direction, the rotation direction of the first transport roller 62a is switched to the A direction (forward direction) or the B direction (reverse direction), but the upstream transport roller 61a. And the second transport roller 63a rotate only in the A direction. It should be noted that one gear train may be engaged with an odd number of times and the other gear train may be engaged with an even number of times, and the number of meshes is not limited to 3 and 4, and may be appropriately determined depending on the configuration of the drive mechanism. Is set.

  Therefore, when a jam occurs in the first transport path P1, if the jam processing member 94 is operated in one direction, the jammed paper moves from the first transport path P1 and passes through the reverse discharge transport path 77 (see FIG. 1). Thus, the jammed paper can be discharged to the first discharge tray 66. Further, when a jam occurs in the second transport path P2, if the jam processing member 94 is operated in one direction as described above, the jammed paper moves from the second transport path P2, and the second discharge tray 67 (see FIG. 1). The jammed paper can be discharged. On the other hand, when a jam occurs in the third transport path P3, when the jam processing member 94 is operated in the other direction, the jammed paper moves from the third transport path P3 and is jammed on the second discharge tray 67 (see FIG. 1). Can be discharged.

  Thus, even when a jam occurs in any one of the first to third transport paths P1 to P3, the jam can be released by one jam processing member 94, and the jam processing operation is simple. In addition, it is not necessary to dispose the jam processing member 94 in each conveyance path, the apparatus can be downsized, and the manufacturing cost can be reduced.

  In addition, when rotating each conveyance roller 61a-63a with the motor 98 (refer FIG. 3), the motor gear 93 provided in the motor 98 is good to set it as the structure which meshes | engages with the 3rd gear 83. FIG. When the motor 98 is driven to rotate, the third gear 83 and the gear train of the gears 101 to 104 and the ninth gear 89 or the third gear 83, the gear train of the gears 105 to 107 and the ninth gear 89, A rotational force is transmitted and the 1st conveyance roller 62a, the 2nd conveyance roller 63a, and the upstream conveyance roller 61a rotate. Further, the motor gear 93 may be appropriately replaced with the third gear 83 depending on the configuration of the drive mechanism, and a gear may be interposed between the motor gear 93 and the third gear 83.

(Third embodiment)
FIG. 8 is a schematic plan view showing a drive mechanism according to the third embodiment. FIG. 3A is a diagram illustrating a jam processing operation of the first transport path or the second transport path, and FIG. 3B is a diagram illustrating a jam processing operation of the third transport path. In the third embodiment, a swing gear is used as the rotation direction switching mechanism.

  Similar to the first embodiment, the third gear 83 is fixed to the first roller shaft 62c extending in the longitudinal direction from the first transport roller 62a (see FIG. 3), and is in the A direction according to the operation of the jam processing member 94. It rotates in the (forward direction) and B direction (reverse direction).

  The ninth gear 89 is an output gear of the gear train, and is provided coaxially with the tenth gear 90 provided coaxially with the second conveying roller 63a (see FIG. 3) and upstream conveying roller 61a (see FIG. 3). Is engaged with the eleventh gear 91. Accordingly, when the ninth gear 89 rotates, the second transport roller 63a and the upstream transport roller 61a rotate.

  A plurality of gears 111 to 116 are provided between the third gear 83 and the tenth gear 90. Each gear consists of a spur gear.

  The gear 111 meshes with a third gear 83 that is an input gear of the gear train. The rotation shaft 111a of the gear 111 is swingably held in an arc-shaped sliding hole 117 formed in a bracket (not shown). The sliding hole 117 is formed in an arc shape that is substantially concentric with the pitch circle of the third gear 83, whereby the gear (swinging gear) 111 keeps meshing with the third gear 83 and the rotating shaft 111 a slides. The inside of the moving hole 117 is swung. As shown in FIG. 8 (a), the swing gear 111 has a first position where the rotating shaft 111a contacts the upper end surface in the sliding hole 117, and a rotating shaft 111a as shown in FIG. 8 (b). Is movably disposed at a second position where it comes into contact with the lower end surface in the sliding hole 117.

  When the third gear 83 rotates in the A direction (see FIG. 8A), the rotational force of the third gear 83 is transmitted to the swing gear 111, and the rotational shaft 111a moves in the sliding hole 117 by the rotational force. Moving upward, the rocking gear 111 reaches the first position. On the other hand, when the third gear 83 rotates in the B direction (see FIG. 8B), the rotational force of the third gear 83 is transmitted to the swinging gear 111, and the rotational shaft 111a is moved to the sliding hole 117 by the rotational force. The swinging gear 111 reaches the second position.

  As shown in FIG. 8A, when the swing gear 111 moves to the first position, the swing gear 111 meshes with the gear 112. The gear 112 meshes with the gear 113, and the gear 113 meshes with the ninth gear 89. The gear 112, the gear 113, and the ninth gear 89 constitute one gear train. In one gear train, meshing is performed between the rocking gear 111 and the gear 112, meshing between the gear 112 and the gear 113, and between the gear 113 and the ninth gear 89, respectively, for a total of three times. It is configured to mesh. When the third gear 83 rotates, the rotational force is transmitted in the order of the rocking gear 111, the gears 112 and 113, and the ninth gear 89. Accordingly, when the first transport roller 62a rotates in the A direction, the third gear 83 rotates in the A direction, and the tenth gear 90 rotates in the A direction by the swing gear 111 and one gear train. The second transport roller 63a (see FIG. 3) rotates in the A direction (forward direction). Further, when the first transport roller 62a rotates in the A direction, the 11th gear 91 rotates in the A direction by the swing gear 111 and one gear train, so that the upstream transport roller 61a (see FIG. 3) is in the A direction. Rotate in the direction (positive direction).

  As shown in FIG. 8B, when the swing gear 111 moves to the second position, the swing gear 111 meshes with the gear 114. The gear 114 meshes with the gear 115, the gear 115 meshes with the gear 116, and the gear 116 meshes with the ninth gear 89. The gears 114 to 116 and the ninth gear 89 constitute the other gear train. In the other gear train, the rocking gear 111 and the gear 114 mesh with each other, the gear 114 and the gear 115, the gear 115 and the gear 116, and the gear 116 and the ninth gear 89. Between each other, and a total of four engagements. When the third gear 83 rotates, the rotational force is transmitted in the order of the swing gear 111, the gears 114 to 116, and the ninth gear 89. Thus, when the first transport roller 62a rotates in the B direction, the third gear 83 rotates in the B direction, and the tenth gear 90 rotates in the A direction by the swing gear 111 and the other gear train. The second transport roller 63a (see FIG. 3) rotates in the A direction (forward direction). Further, when the first conveying roller 62a rotates in the B direction, the eleventh gear 91 rotates in the A direction by the swing gear 111 and the other gear train, so that the upstream conveying roller 61a (see FIG. 3) becomes A. Rotate in the direction (positive direction).

  As described above, the oscillating gear 111, the gear train that engages the odd number of times, and the gear train that engages the even number of times constitute a rotation direction switching mechanism, and the rotation direction switching mechanism corresponds to the rotation direction of the first conveying roller 62a. Switch the rotation direction of the gear train. With this configuration, when the jam handling member 94 is rotated in one direction or the other direction, the rotation direction of the first transport roller 62a is switched to the A direction (forward direction) or the B direction (reverse direction), but the upstream transport roller 61a. And the second transport roller 63a rotate only in the A direction. In addition, there may be a configuration in which one gear train meshes evenly and the other gear train meshes oddly, and the number of meshing is not limited to 3 times and 4 times. Is set.

  Therefore, when a jam occurs in the first transport path P1, if the jam processing member 94 is operated in one direction, the jammed paper moves from the first transport path P1 and passes through the reverse discharge transport path 77 (see FIG. 1). Thus, the jammed paper can be discharged to the first discharge tray 66. Further, when a jam occurs in the second transport path P2, if the jam processing member 94 is operated in one direction as described above, the jammed paper moves from the second transport path P2, and the second discharge tray 67 (see FIG. 1). The jammed paper can be discharged. On the other hand, when a jam occurs in the third transport path P3, when the jam processing member 94 is operated in the other direction, the jammed paper moves from the third transport path P3 and is jammed on the second discharge tray 67 (see FIG. 1). Can be discharged.

  Thus, even when a jam occurs in any one of the first to third transport paths P1 to P3, the jam can be released by one jam processing member 94, and the jam processing operation is simple. In addition, it is not necessary to dispose the jam processing member 94 in each conveyance path, the apparatus can be downsized, and the manufacturing cost can be reduced.

  In addition, when rotating each conveyance roller 61a-63a with the motor 98 (refer FIG. 3), the motor gear 93 provided in the motor 98 is good to set it as the structure which meshes | engages with the 3rd gear 83. FIG. When the motor 98 is rotationally driven, the gear train of the third gear 83, the swing gear 111, the gears 112 and 113, and the ninth gear 89, or the third gear 83, the swing gear 111, and the gears 114 to 116. The rotational force of the motor 98 is transmitted by the gear train of the ninth gear 89, and the first transport roller 62a, the second transport roller 63a, and the upstream transport roller 61a rotate. Further, the motor gear 93 may be appropriately replaced with the third gear 83 depending on the configuration of the drive mechanism, and a gear may be interposed between the motor gear 93 and the third gear 83.

  In the first to third embodiments, the ninth gear 89 meshes with the tenth gear 90 provided coaxially with the second conveyance roller 63a and the eleventh gear 91 provided coaxially with the upstream conveyance roller 61a. Although the configuration is shown, the present invention is not limited to this, and a gear is interposed between the ninth gear 89 and the tenth gear 90 so that the tenth gear 90 rotates in the opposite direction to the above embodiment. Also good. Further, a gear may be interposed between the ninth gear 89 and the eleventh gear 91 so that the eleventh gear 91 rotates in the opposite direction to the above embodiment.

  In the first to third embodiments, the first gear 81 provided on the jam handling member 94 is engaged with the second gear 82 of the first transport roller 62a. However, the present invention is not limited to this. A gear may be interposed between the first gear 81 and the second gear 82 in accordance with the arrangement and configuration of the jam handling member 94 and the drive mechanism.

  INDUSTRIAL APPLICABILITY The present invention can be used for a sheet material conveying apparatus such as a copying machine, a printer, a facsimile machine, and a composite machine thereof, and an image forming apparatus including the sheet material conveying apparatus. And an image forming apparatus including the same.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Image forming part 21 Branch nail | claw 46 Paper feeding part 61 Upstream conveyance roller pair 61a Upstream conveyance roller 61b Upstream conveyance roller 61c Upstream roller shaft 62 First conveyance roller pair 62a First conveyance roller 62b First Transport roller 62c First roller shaft 63 Second transport roller pair 63a Second transport roller 63b Second transport roller 63c Second roller shaft 64 Discharge roller pair 66 First discharge tray 67 Second discharge tray 70 Paper transport section 71 Paper transport Path 72 image forming transport path 73 post-fixing transport path 74 branch transport path 75 reverse transport path 76 re-transport path 77 reverse discharge transport path 78-80 transport path (branch transport path)
81 1st gear 82 2nd gear 83 3rd gear (one gear train, the other gear train, input gear)
84 4th gear (one gear train, the other gear train)
85 5th gear (one gear train, the other gear train)
86 6th gear (the other gear train, one-way clutch built-in gear)
87 7th gear (one gear train)
88 8th gear (one gear train, gear with built-in one-way clutch)
89 9th gear (output gear)
90 10th gear 91 11th gear 93 motor gear 94 jam processing member 95 upstream paper detection member 96 first paper detection member 97 second paper detection member 98 motor 99 display member 100 control unit 101-104 one gear train 101, 105 gear (gear with built-in one-way clutch)
105-107 The other gear train 111 Oscillating gear 111a Rotating shaft 112, 113 One gear train 114-116 The other gear train 117 Sliding hole P1 First transport path P2 Second transport path P3 Third transport path

Claims (7)

In the sheet material conveying apparatus that manually conveys the sheet material and releases the jam when the jam of the sheet material occurs,
An upstream conveying roller for conveying the sheet material;
A first transport roller and a second transport roller which are disposed on the downstream side of the transport path of the sheet material with respect to the upstream transport roller and transport the sheet material;
A first conveying path for conveying the sheet material from the upstream conveying roller to the first conveying roller by rotating the upstream conveying roller and the first conveying roller in the forward direction;
A second transport path different from the first transport path for transporting the sheet material from the upstream transport roller to the second transport roller by rotating the upstream transport roller and the second transport roller in the forward direction. When,
A third conveyance path for conveying the sheet material from the first conveyance roller to the second conveyance roller by rotating the first conveyance roller in the reverse direction and rotating the second conveyance roller in the forward direction;
A jam handling member that allows the first transport roller to rotate forward and backward;
When the first transport roller rotates forward or backward, the upstream transport roller and the second transport roller rotate in the forward direction so that the rotational force of the first transport roller is rotated by the output gear. A rotation direction switching mechanism including a gear train that is transmitted to the roller,
The sheet material stopped in the first transport path and the second transport path can be transported by rotating the first transport roller forward by an operation in one direction of the jam processing member, and the other direction of the jam processing member. The sheet material conveying apparatus is characterized in that the sheet material stopped in the third conveying path can be conveyed by reversely rotating the first conveying roller by the operation of (1). The rotation direction switching mechanism includes two gears incorporating a one-way clutch that switches transmission of rotational force according to the rotation direction of the first transport roller, a gear train in which the gear meshes evenly, and a gear in which the gear meshes oddly Two gear trains with rows,
The one one-way clutch transmits the rotational force in the forward direction of the first transport roller to the output gear via the one gear train, and the other one-way clutch is the rotational force in the reverse direction of the first transport roller. The sheet material conveying device according to claim 1, wherein the sheet material is transmitted to the output gear via the other gear train. The rotation direction switching mechanism includes an input gear that is rotated by rotation of the first transport roller, and meshes with the input gear, and is rotated between a first position and a second position by a rotational driving force transmitted from the input gear. And two gear trains, a gear train in which the gear meshes an odd number of times and a gear train in which the gear meshes an even number of times,
When the first transport roller rotates forward, the swing gear swings to the first position, the one gear train transmits a rotational force to the output gear, and the first transport roller rotates in reverse. The sheet material conveying device according to claim 1, wherein the swing gear swings to a second position, and the other gear train transmits a rotational force to the output gear.   The said output gear meshes with the gear provided coaxially with the said upstream conveyance roller while it meshes | engages with the gear provided coaxially with the said 2nd conveyance roller, The any one of Claims 1-3 characterized by the above-mentioned. The sheet | seat material conveying apparatus of description.   A display member that displays an operation direction of the jam handling member; and a sheet detection member that detects the presence or absence of a sheet material in the first to third conveyance paths, and based on a detection result of the sheet detection member, The sheet material conveying apparatus according to any one of claims 1 to 4, wherein an operation direction of the jam processing member is displayed on a display member. The sheet detection member has a first sheet detection member disposed in the vicinity of the upstream side of the first conveyance path with respect to the first conveyance roller,
When the first sheet detection member detects the sheet material, the display member displays an operation in one direction of the jam processing member, and then the passage of the rear end of the sheet material by the first sheet detection member is detected. 6. The sheet material conveying apparatus according to claim 5, wherein the display member displays an operation in the other direction of the jam processing member.   An image forming apparatus comprising the sheet material conveying device according to claim 1.

Images