JP2009113901A - Paper conveyor and paper handling equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper conveyor and the like, when structured such that a portion of a paper conveying path is opened with a pair of conveying rolls remaining, capable of removing paper by manually holding a part of the paper to be removed, even when the paper to be removed is caught between the pair of conveying rolls existing in the opened portion of the conveying path, where at least one of the front and rear ends of the paper in its conveying direction is not exposed to the opened portion of the conveying path. <P>SOLUTION: The paper conveyor includes path forming members each having a path forming surface, disposed in opposing states to form the paper conveying path, and the pair of conveying rolls to convey paper to pass through the conveying path formed by the path forming members, in a structure in which a part of the path forming member disposed on one side retreats to open a portion of the conveying path with the pair of conveying rolls remaining, wherein a recessed portion depressed in the direction opposite to the conveying path side is formed at a part of the path forming surface of the path forming member, which exists in the opened portion of the conveying path. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a paper transport device and a paper handling device using the same.

  2. Description of the Related Art Conventionally, a paper transport provided with a path forming member that is installed in an opposed state to form a paper transport path, and a pair of transport rolls that transport the paper and pass through the transport path formed by the path forming member. As apparatuses, for example, the following apparatuses are known as those applied to image forming apparatuses such as printers, copiers, and facsimiles.

  A sheet conveying device that opens at least a part of a sheet conveying path by a cover member that can be opened and closed and forms a space for retracting a sheet to be removed from the sheet conveying path. A pair is provided on the covering member so as to move together with the opening and closing operation of the covering member, and the sheet to be removed sandwiched between the pair of conveying rollers is provided on the covering member by opening the covering member. There is a sheet conveying apparatus in which the sheet is pulled out into the space while being sandwiched between a pair of conveying rolls (Patent Document 1).

  In addition, a curved guide means for guiding the sheet to bend along the guide surface in the conveyance direction is provided, and the guide surfaces (of the guide ribs) for guiding the sheet to the curved portion of the curved guide means are arranged at both ends in the sheet width direction. There is a sheet conveying device in which a portion is located closer to the center of curvature of the curved portion than a central portion, and an image forming apparatus including the sheet conveying device (Patent Document 2).

Japanese Patent No. 3715122 (FIGS. 7 and 9) JP 2006-111364 A (FIGS. 1 and 3)

  In the present invention, when a part of a member disposed on one side of the passage forming member is retracted by an opening / closing mechanism or the like and a part of the paper transport path is opened in a state where the pair of transport rolls remains, the opening is performed. In the conveyance path portion in which at least one of the front and rear end portions in the conveyance direction of the sheet is opened while the sheet (sheet-like recording medium, etc.) to be removed is sandwiched between the pair of conveyance rolls existing in the conveyed conveyance path portion A paper transport apparatus that can easily pinch and remove a part of the paper to be removed without increasing unnecessary space even in an unexposed state, and image formation using the same A device is provided.

The sheet conveying apparatus according to the present invention (A1) includes a path forming member having a path forming surface that is disposed in an opposed state to form a sheet conveying path, and a sheet that is formed by the path forming member by conveying a sheet. A pair of transport rolls passing through the passage,
A part of the member disposed on one side of the passage forming member is retracted, and a part of the transport path is opened in a state where the pair of transport rollers remains, and is present in the opened transport path part. A recess is formed on a part of the passage forming surface of the passage forming member.

  The discharge conveyance device of the invention (A2) is the paper conveyance device of the invention A1, wherein the concave portion has a position where at least one of right and left end portions along a conveyance direction of the paper conveyed through the conveyance path passes. It is formed in an included state.

  The discharge conveying device of the invention (A3) is the paper conveying device of the invention A1 or A2, wherein the concave portion is formed at a position downstream of the conveying roll in the sheet conveying direction.

  The discharge conveying apparatus according to the present invention (A4) is the sheet conveying apparatus according to any one of the inventions A1 to A3, wherein the surface of the concave portion on the downstream side in the sheet conveying direction moves in the sheet conveying direction. It is formed with the inclined surface which inclines so that it may approach the height of this.

  The image forming apparatus according to the present invention (B) includes the sheet conveying apparatus according to any one of the above-described inventions A1 to A4.

  According to the sheet conveying apparatus of the invention A1, the sheet to be removed is sandwiched between the pair of conveying rolls existing in the opened conveying path portion and the sheet is conveyed as compared with the case of not having the configuration of the invention. Even in a state where at least one of the front and rear end portions in the direction is not exposed in the opened conveyance path portion, a part of the sheet to be removed can be easily handed in the recess without increasing unnecessary space. Can be removed by pinching.

  In the paper transport device of the invention A2, it is possible to easily pinch and remove at least a part of the left and right end portions along the transport direction of the paper to be removed by hand as compared with the case where the configuration is not provided.

  In the sheet conveying apparatus of the invention A3, as compared with the case where the configuration is not provided, the upstream end (rear end) of the sheet to be removed in the conveying direction is sandwiched between the pair of conveying rolls and the conveying direction. Even in a state where the downstream end (front end) is not exposed to the opened conveyance path portion, the sheet can be easily pinched and removed by hand in the recess.

  In the paper conveying apparatus of the invention A4, compared to the case where the configuration is not provided, even when the leading corner portion of the conveyed paper is conveyed in a state of entering the concave portion, the concave portion in the paper conveying direction is downstream. It is smoothly transported without being caught on the side surface.

  According to the image forming apparatus of the invention B, the sheet to be removed is sandwiched between the pair of conveying rolls existing in the opened conveying path portion of the sheet conveying apparatus as compared with the case where the configuration is not provided. Even in a state where at least one of the front and rear end portions in the transport direction is not exposed in the opened transport path portion, a part of the paper to be removed can be easily removed in the recess without increasing unnecessary space. It can be removed by pinching by hand.

  FIG. 1 is an explanatory diagram showing a main part of a sheet conveying apparatus 1 and an image forming apparatus 100 using the same according to an embodiment of the present invention.

  In FIG. 1, reference numeral 110 denotes an apparatus main body including a support frame and an exterior cover of the image forming apparatus 100. Reference numeral 120 denotes an image forming apparatus that forms a toner image as an unfixed image and transfers the toner image to a sheet 9. Is a fixing device for fixing the toner image transferred by the image forming device 120 to the paper 9. Further, reference numeral PR1 is a paper feed path for transporting and feeding the paper 9 from a paper feeding device (not shown) to the image forming apparatus 120, and reference numeral PR2 is transporting the paper 9 sent from the fixing device 130 to the discharge port 112 of the apparatus main body 110. The paper discharge path, the sign PR3, is formed again in the image forming apparatus 120 (actually, the joining point of the paper feed path PR1) with the front and back surfaces of the paper 9 sent out from the fixing device 130 turned on at the time of double-sided image formation. A reverse retransmission path 113 for conveying the sheet 9 is a paper discharge container for storing the sheets 9 discharged from the discharge port 112 in a stacked state. An alternate long and short dash line with an arrow indicates a part of the conveyance path of the paper 9.

  The image forming apparatus 120 employs a recording method such as a known electrophotographic method or electrostatic recording method. Specifically, an electrostatic latent image based on input image information input from the outside of the apparatus is formed on an image holding member such as a photosensitive member charged by a charging device by the latent image forming device, and then the electrostatic latent image is developed by the developing device. A toner image is formed by developing with the developer supplied from the toner, and then the toner image is directly transferred to one side of the required paper 9 supplied through the paper feed path PR1 by the transfer device or intermediate The transfer material is relayed and transferred. The image forming device 120 is a single color image forming device that forms a single color toner image composed of one type of toner, and a multicolor image forming device that forms a multicolor toner image composed of a plurality of types (colors) of toner. Any of the image devices may be used.

  The paper feed path PR1 is installed in a predetermined number of guide members 141 that form a transport path for the paper 9 in a process from a paper feed device (not shown) to the image forming device 120, and a predetermined position in the transport path. A pair of transport rolls 142. Of the transport rolls 142, the transport roll 142 a installed at a position immediately before the image forming device 120 operates to temporarily stop the leading end portion of the paper 9 being transported and then send it to the image forming device 120 at a predetermined timing. .

  The fixing device 130 includes a heating rotator 131 that is heated to a predetermined temperature by a heating source 132 and rotationally driven, and a pressure rotator 133 that rotates in contact with the heating roll 131 at a predetermined pressure. It is. The heating rotator 131 is rotationally driven at a predetermined speed by a rotation driving device (not shown). In FIG. 1, reference numeral 135 denotes a heat-insulating housing that covers the periphery of the heating rotator 131 and the pressure rotator 133, reference numeral 136 denotes an introduction-side guide plate that can guide the sheet 9 to be fixed at the time of introduction, and 137 denotes fixing. A discharge-side guide plate capable of guiding the subsequent sheet 9 during discharge is shown.

  In the fixing device 130, the sheet 9 to which the toner image is transferred and sent out by the image forming device 120 is guided by the introduction-side guide plate 136 and is brought into contact with the heating rotator 131 and the pressure rotator 133 (fixing nip portion). By being introduced and heated and pressurized when passing through the contact portion, the toner of the toner image is melted and fixed on the paper 9. The sheet 9 after the fixing process is guided to the discharge side guide plate 137 and sent out of the casing 135.

  The discharge path PR2 extends from a position on the sheet discharge side of the fixing device 130 to a discharge port 121 disposed at a position obliquely above the fixing device 130 (in this example, an upper position shifted to the heating rotator 131 side). And a plurality of guide members 141 that form a conveyance path for the sheet 9 and a discharge roll pair 142 (142a, 142b) that finally sends out the sheet 9 conveyed through the conveyance path from the discharge port 112. Yes. One side 142a of the discharge roll pair 142 is driven to rotate in a forward / reverse direction by a rotation driving device (not shown) so that the paper feeding direction can be switched. Reference numeral 145 in the drawing is a charge removal member for contacting the sheet 9 when discharged and discharging it.

  In this example, an upper guide member 141a having an inclined guide surface that gradually rises toward the discharge roll 142 at the upper position of the fixing device 130 is installed as the guide member 141. The upper guide member 141a is a reverse that will be described later. It also functions as a guide member (152) for the conveyance path PR3. Further, a switching guide member (151) of the reverse conveyance path PR3 described later functions as a part of the guide member 143. Further, a warp correction roll 147 for correcting the warp state (so-called curl) of the paper 9 is installed at a position on the paper discharge side of the fixing device 130 which is the starting side of the discharge path PR2. The warp correction roll 147 includes a pair of rolls 147a and 147b that rotate in contact with each other. One of the rolls 147a serves as a drive roll, and the other roll 147b is elastic when it comes into contact with the drive roll 147a. It is an elastic roll that is greatly elastically deformed in a state where the outer peripheral portion is wound around the roll peripheral surface of the drive roll 147a.

  The reverse retransmission path PR3 branches at a position before the discharge rollers 142 and 143 of the discharge path PR2, passes through the upper position of the fixing device 130 from the branch point, and reaches the merging point with the paper feed path PR1. A plurality of guide members 152 forming a conveyance path for the paper 9 and a pair of conveyance rolls 153 to 155 installed in a predetermined number at predetermined positions of the conveyance path. Further, at the branch point of the reverse retransmission path PR3 with the discharge path PR2, the rear end portion in the feeding direction of the paper 9 being discharged by the discharge roll pair 142 is reversed by the reverse rotation of the discharge roll pair 142. A switching guide member 151 is provided for switching and conveying the paper so that it is fed to the paper path side.

  The switching guide member 151 is a tapered member supported so as to be able to swing around the support shaft 151a at a position on the paper discharge side of the warp correction roll 147 (upper position in FIG. 1). (When the sheet is not conveyed) The tapered tip end portion closes the discharge path PR2 and the reverse retransmission path PR3 is opened (the state shown in FIG. 1). When the sheet 9 is discharged and conveyed, the sheet 9 is conveyed. The lower end is pushed by the tip of the direction and swings and is lifted upward (this causes the discharge path PR2 to be opened).

  In addition, a part of the reverse retransmission path PR3 is configured by the sheet transport device 1 shown below.

  1-4, as shown in FIGS. 1 to 4, the guide member 152 (12, 13) that constitutes the reverse retransmission path PR3 and the plurality of transport roll pairs 153 that pass through the reverse retransmission path PR3 are provided. 155 (15 to 17), and a part (22A) of the guide member 152 (12) disposed outside the apparatus can be removed from the guide member 152, and a part of the reverse retransmission path PR3 can be removed by the removal. In a state where the pair of transport rolls 154 remains.

  In the figure, reference numeral 21 is a support frame of the apparatus, 22 is a plate-shaped outer cover, 23 is a handle, 24 is a paper detection sensor for detecting whether or not the paper has passed through the reverse retransmission path PR3, and 25 is a main body of the apparatus. An attachment claw 26 to be inserted into the attachment hole is a screw insertion hole for inserting a fixing screw to be attached to the screw hole of the apparatus main body. The sheet detection sensor 24 includes a detection member (actuator) that exists in the sheet conveyance path when not passing and swings when the sheet 9 comes into contact. The sheet detection sensor 24 passes the detection member 9 in the sheet conveyance direction A. After the paper is swung in the downstream direction and brought into a tilted state, the paper is swung and returned to the original state after the passage is completed, thereby detecting the completion of the passage of the sheet.

  The guide member 152 in the paper transport apparatus 1 is composed of an outer guide member 12 disposed on the outside (left side in FIGS. 1 to 3) of the apparatus and an inner guide member 13 disposed on the inside thereof. The outer guide member 12 is composed of a plurality of protrusions (ribs) extending in parallel along the paper transport direction A, and is distributed or attached to the support frame 21 and the exterior cover 22. The inner guide member 13 includes a surface portion (main body) 13a that forms a transport path for the paper 9, and a plurality of protrusions 13b that extend in parallel along the paper transport direction A on the surface portion 13a. Attached to the frame 21. The outer guide member 12 and the inner guide member 13 are arranged in a state of being opposed to each other with a predetermined interval. A part of the road PR3).

  The conveyance roll pairs 153 to 155 are a first conveyance roll pair 153, a second conveyance roll pair 154, and a third conveyance roll pair 155, all of which are indicated by arrows by a rotation drive device (motor, rotation transmission mechanism, etc.) 27. The driving rolls 15a to 17a are rotationally driven in the direction at a predetermined speed, and driven rolls 15b to 17b are rotated in contact with the driving rolls 15a to 17a with a predetermined pressure. 2 to 4, reference numeral 16c denotes a drive shaft of the drive roll 16a. The first to third transport roll pairs 153 to 155 (15 to 17) are located at the most upstream position, the most downstream position, and the intermediate position of the reverse retransmission path PR3 formed by the outer guide member 12 and the inner guide member 13. , Each contact portion (conveying nip portion) N where each of the driving rolls and each of the follower rolls contacts is installed in a state where it is located in the sheet conveying path.

  In addition, a conveyance path (reversal) that exists between a part of the outer side guide member 12 on the downstream side in the paper conveyance direction A of the first conveyance roll pair 15 and a part on the upstream side in the paper conveyance direction A of the third conveyance roll pair 17. A part 12A corresponding to the retransmission path PR3) region is configured as a detachable guide member, and is detachable together with the exterior cover 22A on which the detachable outer guide member 12A is formed (FIG. 3). .

  In the sheet conveying apparatus 1, by removing the removable outer guide member 12A and the outer cover 22A, as shown in FIGS. 3 and 4, a part PR30 of the reverse retransmission path PR3 is exposed to the outside and opened. It becomes a state. At this time, the second transport roll 16 is in a state where both the drive roll 16a and the driven roll 16b remain on the apparatus main body (inner guide member 13) side and are exposed to the outside. Further, the remaining portion 12B of the outer guide member and the first and third transport roll pairs 15 and 17 are also left on the apparatus main body side, and are hidden by the exterior cover 22B that is not removed and are not exposed to the outside. Put in condition.

  For the detachable outer guide member 12A and the outer cover 22A, an attachment claw 25 formed at the lower part of the outer cover is inserted into an attachment hole (not shown) of the apparatus main body, and there is a handle 23 at the upper part of the outer cover. It is structured to be attached / detached by hooking a disengageable hook member (latch) not shown in the position to the apparatus main body or releasing the hook. At the time of the attachment / detachment, the hook member 23 is held to displace the hook member. The attachment / detachment work is performed. In FIG. 3, reference numeral 14 denotes an accommodation space for accommodating a part of the second transport roll pair 16 (drive roll 16a) in the detachable outer guide member 12A.

  And in this paper conveying apparatus 1, in part 13A of the channel | path formation surface part 13 of the inner side guide member 13 which exists in the open part PR30 of the inversion re-transmission path opened by removal of the outer guide member 12A and the exterior cover 22A which can be attached or detached. A concave portion 4 is formed which is recessed on the opposite side (the right side in FIGS. 1 to 3) of the reverse retransmission path.

  In this embodiment, as shown in FIGS. 4 and 5, the concave portion 4 is a position on the downstream side in the paper transport direction A of the second transport roll 16 in the open portion PR30 of the reverse retransmission path, and is adjacent to each other. It is formed between the ribs 13b. About the rib 13b which exists in the site | part which forms this recessed part 4, it is preferable to set the space | interval of the adjacent rib to the dimension which can insert a human finger at least, for example, to the dimension of 15-20 mm To do.

  Further, the concave portion 4 has left and right end portions 9c and 9d along the conveyance direction A of various types of paper 9A to 9C (including differences in size and also in the feeding direction) conveyed through the open portion PR30 of the reverse retransmission path. Position P (for example, P1 to P3) to which at least one of them (the left end portion 9d in this example as viewed from the conveyance direction A. The end portion on the right side in FIG. 5) is to pass is included in the opening region of the recess 4. It is formed in a state. In this example, the left side (the right side in FIG. 4) when viewed from the sheet conveyance direction A corresponds to the side close to the front side where the user of the image forming apparatus 100 stands and operates. For this reason, when the user removes the jammed paper 9 which will be described later, the user can easily remove the paper by bringing his hand (actually a fingertip) close to the recess 4.

  Moreover, each recessed part 4 (4A-4D) is a thing of the shape which has the bottom face part 41 and the some side part 42 which depressed 13 A of surface parts, as shown in FIG.4 and FIG.6. In particular, the side surface portion 42a on the downstream side in the paper transport direction A is formed as an inclined surface that is inclined so as to approach the height of the passage forming surface 13a (the surface thereof) as it moves in the paper transport direction A. Further, of the side surface portion 42, the side surface portion 42b on the upstream side in the paper conveyance direction A needs to be an inclined surface that inclines so as to move away from the height of the passage forming surface 13a as it moves in the paper conveyance direction A, for example. For example, it may be formed as a surface that hangs perpendicularly to the surface portion 13a.

  Furthermore, as shown in FIG. 6, each of the recesses 4 (4 </ b> A to 4 </ b> D) has a depth that satisfies at least a predetermined depth H from the top of the rib 13 b of the inner guide member 13 (the highest part of the sheet guide). Is formed. The predetermined depth H is, for example, preferably a dimension that allows the end of the sheet 9 to be removed present in the recess 4 to be easily pinched with a human finger, for example, 15 mm. Incidentally, the height difference h1 between the top of the rib 13b and the conveyance ideal line E indicated by a two-dot chain line when the sheet is fed almost horizontally from the conveyance nip N of the second conveyance roll 16 is, for example, 0.5 to. The size is set to 1.0 mm. The rib 13b is set so that the height difference (rib height) h2 between the top and the surface portion 13a (surface) of the inner guide member 13 is, for example, about 1.5 mm.

  Next, the operation of the image forming apparatus 100 (and the paper transport apparatus 1) will be described.

  When an image is formed, a toner image based on the input image information is formed in the image forming device 120 as described above, and the toner image is transferred to one side of the paper 9 sent to the image forming device 120 through the paper feed path PR1. The Subsequently, the sheet 9 on which the toner image is transferred by the image forming device 120 is sent out from the image forming device 120 and then sent to the fixing device 130, and the toner image is rotated as described above and the heating rotator 131 and the heating member 131. When passing through the contact portion of the pressure rotator 133, it is heated and pressurized and fixed to the paper 9.

  As shown in FIG. 1, the sheet 9 after the completion of fixing is sent out from the fixing device 130, and then first passes through a warp correction roll 147 that is installed on the starting point side of the discharge path PR2 and rotationally driven. It is bent so as to warp on the opposite side of the surface. Thereafter, the sheet 9 is discharged from the discharge roll 142a that is driven to rotate in the discharge direction (counterclockwise direction in FIG. 1) through the discharge path PR2 while maintaining the state in which the switching guide member 151 is swung up and pushed up. The paper is sent to the roll pair 142, and finally sent out from the discharge port 112 by the discharge roll pair 142 and stored in the paper discharge storage portion 113. When the rear end of the sheet 9 in the feeding direction finishes passing through the switching guide member 151, the switching guide member 151 swings downward, thereby closing the discharge path PR2 while reversing the retransmission path. PR3 is in an open state.

  When images are formed on both the front and back sides of the paper 9, the following operation is performed.

  In this case, first, after an image is formed on one side (after fixing), the sheet 9 is conveyed to the discharge roll pair 142 of the discharge path PR2, and the rear end portion in the feed direction passes through the switching guide member 151. At a point before passing the discharge roll 142, the discharge roll 142 is switched to a direction opposite to the discharge direction (clockwise direction in FIG. 1) and starts to rotate (reverse). At the same time, the transport rolls 153 to 155 (15 to 17) in the reverse retransmission path PR3 (paper transport apparatus 1) also start to rotate in the paper feed direction (clockwise direction in FIG. 1 and the like).

  At this time, the sheet 9 starts to be transported with the trailing end leading by the transport force of the reversely rotating discharge roll 142, and is guided by the upper portion of the switching guide member 151 and the guide member 152 toward the reverse retransmission path PR 3. It is transported towards. Then, the sheet 9 sent to the reverse retransmission path PR3 is successively conveyed by the conveyance force of each of the conveyance roll pairs 153 to 155, passes through the retransmission path PR3, and finally has the front and back surfaces of the sheet feeding path PR1. Retransmitted in inverted state. In the paper 9 passing through the reverse retransmission path PR3, for example, even if the left corner of the leading end in the transport direction A passes through the inside of the concave portion 4, the concave portion 4 Since it is guided so as to come out of the recess 4 by the inclined surface 42a on the downstream side in the transport direction, it is avoided that it is caught in the recess 4.

  The paper 9 retransmitted to the paper feed path PR1 is transferred to the fixing device 130 after the toner image is transferred to the opposite side by the image forming device 120, and subjected to fixing processing. Further, the sheet 9 fixed by the fixing device 130 is transported through the discharge path PR2 in the same state as described above, and finally sent out from the discharge port 112 to the discharge storage unit 113 for storage.

  In the image forming apparatus 100, the sheet 9 to be conveyed is jammed and conveyed while being held between the second conveying roll pair 154 (16) in the sheet conveying apparatus 1 constituting a part of the reverse retransmission path PR3. In an unusable state (so-called jam phenomenon, which is a paper jam), the removable outer guide member 12A and the outer cover 22A are removed to remove the jammed paper 9, and a part of the reverse retransmission path PR3 (open portion PR30). The paper is removed after the is opened.

  At this time, as shown in FIG. 5 and FIG. 7, the leading end side of the sheet 9 in the feeding direction is hidden behind the non-open portion PR33 located on the downstream side of the reverse conveying path, and the trailing end portion in the feeding direction When 9b is held by the second conveying roll pair 16 and slightly jammed in a state of slightly protruding upstream in the conveying direction A, the jammed sheet 9J1 is removed as follows, for example. Incidentally, the leading end portion of the sheet that is hidden inside the non-opening portion PR33 of the reversal transport path is not held by being sandwiched by the pair of transport rolls 155 existing in the non-opening portion PR33, but is held. It doesn't matter.

  In this case, first, after confirming the concave portion 4 (any one of 4A to 4D) in which the left end portion 9d in the conveyance direction A of the jammed paper 9J1 is located in the opening region, as shown in FIG. The finger 6 (a) is inserted into the space of the target recess 4, and the left end 9b of the paper 9J1 is pinched with another finger 6 (b) in the recess 4.

  Next, the jammed paper 9J1 is moved in a direction away from the surface 13a of the guide member. As a result, the rear end portion 9b in the feeding direction of the sheet 9J1 is pulled out from the second conveying roll pair 16 (conveying nip portion N) and released (the state is the rear end portion 9b indicated by a two-dot chain line in FIG. 7). ). At this time, the second conveyance roll pair 16 rotates in the direction (feed direction) indicated by the dotted arrow B in FIG. 7 by the rear end portion 9b of the sheet 9J1 being pulled out. Thereafter, by grasping and pulling the paper 9J1, the leading end side hidden inside the non-opening portion PR33 of the reverse conveyance path is pulled out from the non-opening portion. As a result, the entire sheet 9J1 is removed.

  Further, as shown in FIG. 8, the vicinity of the central portion of the sheet 9 is held by the second conveying roll pair 16, and the leading end portion 9a in the feeding direction of the sheet 9 is not on the downstream side of the reverse conveying path. When the paper is jammed in a state where it is hidden inside the open part PR33 and its rear end 9b in the feed direction is hidden inside the non-open part PR32 on the upstream side of the reverse conveyance path The jammed paper 9J2 is removed as follows, for example.

  Also in this case, first, after confirming the concave portion 4 (any one of 4A to 4D) where the left end portion 9d in the conveyance direction A of the jammed paper 9J2 is located in the opening region, as shown in FIG. The finger 6 (a) is inserted into the space of the target recess 4, and the left end 9b of the paper 9J2 is pinched with the other finger 6 (b) in the recess 4.

  Next, when the jammed sheet 9J2 is moved in a direction away from the surface 13a of the guide member, the feeding direction leading end 9a of the sheet 9J2 is pulled out from the non-open portion PR33 on the downstream side of the reverse conveyance path (two in FIG. 8). It becomes the state of the front end portion 9a indicated by a dotted line). Thereafter, by grasping and pulling the paper 9J2, the rear end portion 9b in the feeding direction of the paper 9J2 is pulled out from the non-open portion PR32 on the upstream side of the reverse transport path and is pulled out from the second transport roll pair 16 and opened. Is done. As a result, the entire sheet 9J2 is removed.

[Modification]
In the above embodiment, as shown in FIG. 9, instead of or in addition to the concave portion 4 formed at a position on the downstream side in the paper transport direction A of the second transport roll 16 in the open portion PR30 of the reverse retransmission path. In addition, the recess 40 may be formed at a position on the upstream side of the second transport roll 16 in the paper transport direction A. The configuration of the recess 40 can be the same as the configuration of the recess 4 described above.

  When the concave portion 40 is formed, as shown in FIG. 9, the rear end portion (9b) side of the sheet 9 in the feeding direction is hidden inside the non-open portion PR32 on the upstream side of the reverse conveyance path. In the case where the paper-feed jammed paper 9J3 is held in the second transport roll pair 16 and slightly protrudes downstream in the transport direction A, the jammed paper 9J3 is removed as follows, for example. be able to.

  Also in this case, first, the left end 9d in the conveyance direction A of the jammed paper 9J3 is located in the opening 40 in the concave portion 40 (the concave portions 4A to 4D shown in FIG. 4 are arranged in the paper conveyance direction A of the second conveyance roll 16). After confirming any one of the recesses 40A to 40D provided in the corresponding position on the upstream side), as shown in FIG. 9, the finger 6 (a) is inserted into the space of the target recess 40, In the recess 4, the left end portion 9b of the paper 9J2 is pinched with another finger 6 (b).

  Next, when the jammed sheet 9J3 is moved in a direction away from the surface 13a of the guide member, the rear end 9b in the feeding direction of the sheet 9J3 is pulled out from the non-open portion PR32 on the upstream side of the reverse conveyance path (in FIG. 9). The state of the rear end portion 9b indicated by a two-dot chain line is obtained). Thereafter, by grasping and pulling the paper 9J3, the leading end portion 9a of the paper 9J3 is pulled out from the second conveying roll pair 16 and released. At this time, the second conveyance roll pair 16 is rotated in the direction indicated by the dotted arrow C in FIG. 8 (the direction opposite to the feeding direction) by the feeding direction leading end portion 9a of the sheet 9J3 to be pulled out. As a result, the entire sheet 9J3 is removed.

  Moreover, in the said embodiment, although the said recessed part 4 (recessed part 40) was formed in the shape which has the bottom face part 41 different from the side part 42 of the upstream and downstream of the conveyance direction A of a sheet | seat, the recessed part The shape of the (bottom surface portion) may be any other shape as long as a space is secured to easily hold the left and right side portions of the paper by inserting a finger, for example, a curved shape. Furthermore, the number and positions of the recesses 4 (recesses 40) are not limited to the configuration example of the above embodiment and can be changed.

  Furthermore, in the above embodiment, the guide member 12 that opens a part of the reversal conveyance path PR3 (open part PR30) is removed by removing a part 12A together with a part 22A of the exterior cover on which the guide member is formed. Although the configuration for obtaining the state has been illustrated, it is not limited to the open (retracted) type, and other methods may be adopted. For example, a part 12A of the guide member 12 to be opened is structured to be able to swing and open with a certain support shaft as a fulcrum together with a part 22A of the exterior cover. It can comprise so that a part may be in an open state. Moreover, as the outer side guide member 12, it is also possible to apply not only a rib but the thing comprised by a surface part (13a) and a rib similarly to the inner side guide member 13. FIG.

  In addition, the sheet conveying apparatus 1 having the concave portion 4 (the concave portion 40) as exemplified in the above embodiment can be applied to a sheet conveying path other than the reverse retransmission path PR3 in the image forming apparatus 100. In addition, the sheet conveying apparatus 1 is not limited to being applied to the image forming apparatus 100, and a part of a member disposed on one side of a path forming member having a path forming surface that forms a sheet conveying path is an attachment / detachment mechanism, By retracting by an opening / closing mechanism or the like, it is also possible to apply to other sheet handling apparatuses having a structure in which a part of the transport path is opened while remaining on the side where the transport roll pair is released.

  Other paper handling devices include, for example, an image reading device that reads a paper (original) on which an image to be read is formed (applied to a paper conveyance path that is partially opened), and a large amount of paper is accommodated. Post-processing such as aligning or binding sheets on which an image is formed by a sheet feeding device (applied to a partially-opened sheet conveyance path) that supplies the sheet to the image forming apparatus And a post-processing apparatus (applied to a paper conveyance path in which a part thereof is opened).

  FIG. 10 is an explanatory diagram illustrating a configuration example in which the sheet conveying device 1 is applied to the image reading device 200. The image reading apparatus 200 conveys a document (sheet-like material) 90 having an image to be read from the document storage unit 201 to the first reading unit 202 (and the second reading unit 203) through the document reading conveyance path PR5. The image on one side (or both sides) of the original 90 is read by passing the original 90, and the original 90 after the reading is finally discharged to the discharge container 205. In the figure, reference numeral 207 denotes a first apparatus main body, 208 denotes a second apparatus main body, 212 and 213 denote original guide members constituting the reading conveyance path PR5 (212 is an outer guide member, 213 is an inner guide member), 215 Reference numeral 218 denotes a pair of conveyance rolls of the original constituting the reading conveyance path PR5 (215 is a first conveyance roll pair, 216 is a second conveyance roll pair, 217 is a third conveyance roll pair, and 218 is a fourth conveyance roll pair) Indicates.

  In the image reading apparatus 200, a part of the document transport path PR 5 including the second transport roll pair 216 to the third transport roll pair 217 is configured by the paper transport apparatus 1. That is, as shown in FIGS. 10 and 11, the sheet conveying apparatus 1 includes a part 212A of the outer guide member 212 in the document conveying path PR5 along with a part 208A of the second apparatus main body in the direction of arrow D with the support shaft 209 as a fulcrum. The part PR50 of the document transport path is opened by moving it in the direction shown in FIG. At this time, both the second transport roll pair 216 and the third transport roll pair 217 have both the driving rolls 216a and 217a and the driven rolls 216b and 217b constituting the respective transport roll pairs remaining on the inner guide member 213 side. It becomes a state. About the inner side guide member 213, it is comprised by the surface part (13a) and the rib (13b) similarly to the inner side guide member 13 in the said embodiment.

  In the sheet conveying apparatus 1, one of the passage forming surface portions of the inner guide member 213A existing in the openable portion PR50 of the document conveying path opened by the opening operation of the second guide body 208A and the outer guide member 212A that can be opened and closed. A concave portion 41 that is recessed on the side opposite to the conveyance path side of the document conveyance path (on the right side in FIGS. 10 and 11) is formed in the portion. The recess 41 can adopt the same configuration as the recess 4 in the above embodiment. Incidentally, the concave portion 41 has a structure in which the two conveyance roll pairs 216 and 217 remain in the open portion PR50 of the original conveyance path, so that the concave portion 41 is located on the downstream side in the conveyance direction A of the second conveyance roll pair 216 and at the same time. The three transport roll pairs 217 are formed in a state of being positioned on the upstream side in the transport direction. When the plurality of transport roll pairs remain in the opened transport path in this way, at least the downstream side of the transport roll pair disposed on the most upstream side in the transport direction (the transport roll pair disposed next). It is good to form so that it may be located in the upstream).

  Further, in the document reading apparatus 200 provided with such a sheet transport apparatus 1, for example, as shown in FIG. 11, the leading end 90a side of the document 90 is sandwiched between the third transport roll pair 217 and the document transport path. A state where the rear end 90b in the feed direction is held by the second transporting roll pair 216 and slightly protrudes upstream in the transporting direction A while being hidden inside the non-open portion PR53 located on the downstream side of PR5 If the paper is jammed, the jammed document 90J is removed as follows, for example.

  In this case, first, the left end (or right end) in the conveyance direction A of the jammed document 90J is confirmed in the concave portion 41 located in the opening region, and then the finger is placed on the space of the target concave portion 41. And the end of the original 90J is pinched with another finger in the recess 41. Next, the jammed document 90J is moved away from the surface of the guide member 213A. As a result, the leading end 90a of the document 90J in the feed direction is pulled out from the second transport roll pair 216 (transport nip) and opened. Thereafter, by grasping and pulling the document 90J, the leading end 90a side hidden inside the non-opening portion PR53 of the document transport path is pulled out from the non-opening portion. As a result, the entire original 90J is removed.

  In the document reading apparatus 200, the state in which the leading end 90a side of the document 90 is only sandwiched between the third transport roll pair 217 (the rear end portion 90b in the feed direction is sandwiched between the second transport roll pair 216). Or the state in which the rear end 90b side of the document 90 is simply sandwiched between the second transport roll pair 216 (the front end 90a in the feed direction is sandwiched between the third transport roll pair 217). In the case where the document 90 is not present, the operation of removing the jammed document 90 may be performed by inserting a finger into the space of the recess 41.

FIG. 2 is an explanatory diagram illustrating a main part of a sheet conveying device according to an embodiment and an image forming apparatus using the same. FIG. 2 is a partial cross-sectional view showing an enlarged view of the paper transport device in FIG. 1. FIG. 3 is a partial cross-sectional view illustrating a state when a part of a paper guide member and the like of the paper transport device in FIGS. 1 and 2 is removed. FIG. 4 is a perspective view showing an opened reverse conveyance path on the apparatus main body side of the paper conveyance device in FIG. 3. It is explanatory drawing which shows the recessed part formed in the guide member which comprises the open reverse conveyance path. It is explanatory drawing which shows the structure of the recessed part etc. which are formed in a guide member. FIG. 6 is an explanatory diagram illustrating an example of a state of a sheet jammed in an opened reverse conveyance path and a state when the sheet is removed. It is explanatory drawing which shows the state when removing the other example of the state of the sheet | seat jammed in the open | release reverse conveyance path, and the sheet | seat. It is explanatory drawing which shows the example when the modified example which changed the formation position of the recessed part, the example of the paper jam state in the structural example, and the state when removing the paper. FIG. 2 is an explanatory diagram illustrating a main part of a paper transport device and a document reading device using the same. FIG. 12 is an explanatory diagram illustrating a configuration and an operation state of the sheet conveying device and the document reading device of FIG. 11.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Paper conveying apparatus, 4, 40, 41 ... Recessed part, 9 ... Paper, 9d ... Left end part (one end along a conveying direction) of a conveyance direction, 12, 13 ... Guide member (path formation member), 12A Detachable outer guide member part (a part of the passage forming member arranged on one side), 13a ... Surface portion (passage forming surface), 15-17 (153-155) ... Conveying roll pair, 16 (154) ... No. 2 transport roll pairs (pairs of transport rolls remaining when opened), 42... Inclined surface, 90... Original (paper), 100... Image forming apparatus (paper handling apparatus), 200. ... Transport direction, PR3... Reverse retransmission path (conveyance path), PR30... Open part of the reverse retransmission path (open transport path part), PR50... Open part of the document transport path (open transport path part).

Claims (5)

A path forming member having a path forming surface that is disposed in an opposed state to form a paper transport path, and a transport roll pair that transports the paper and passes through the transport path formed by the path forming member,
A part of the member disposed on one side of the passage forming member is retracted and a part of the transport path is opened in a state where the transport roll pair remains;
In addition, the paper transporting apparatus is characterized in that a concave portion that is depressed on the side opposite to the transport path side is formed in a part of the path forming surface of the path forming member that exists in the opened transport path portion.   The paper conveyance device according to claim 1, wherein the concave portion is formed in a state including a position where at least one of right and left end portions along a conveyance direction of the paper conveyed through the conveyance path is to pass.   The paper conveyance device according to claim 1 or 2, wherein the concave portion is formed at a position downstream of the conveyance roll in the paper conveyance direction.   The surface of the concave portion on the downstream side in the paper conveyance direction is formed with an inclined surface that is inclined so as to approach the height of the passage forming surface as it moves in the paper conveyance direction. The sheet conveying apparatus according to the item.   A paper handling device comprising the paper transport device according to claim 1.

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