JP2022151956A - Sheet carrier device - Google Patents

Abstract

To provide a sheet carrier device capable of reducing defects in carrying sheets in a carrying path.SOLUTION: A sheet carrier device comprises a carrying path 18c including a pair of guide members 13 and 15 guiding sheets, and is configured to move the one guide member 15 to a guide position PB where the carrying path 18c is formed and a standby position PC where the carrying path 18c is opened. The one guide member 15 is moved to the guide position PB after a front end of a sheet is carried out of the carrying path 18c which is opened.SELECTED DRAWING: Figure 7

Description

The present invention relates to a sheet conveying device that conveys sheets, and more particularly to a guide mechanism that guides sheets conveyed along a conveying path.

2. Description of the Related Art Conventionally, sheet conveying apparatuses including image forming apparatuses such as copiers and printers and sheet post-processing apparatuses for performing post-processing on sheets on which images are formed are known. The sheet conveying device includes a sheet binding device that binds sheets and a sheet folding device that folds sheets. A sheet folding device is used for filing or compactly storing a sheet, and automatically folds the sheet in two or three (Z-fold).

For example, in Patent Document 1, a loop is formed by feeding the upstream side of the sheet in a state where the downstream end of the sheet is nipped by a pair of folding rollers. A sheet folding device is disclosed that Z-folds the sheet by pushing it into position and overlapping the downstream edge of the sheet with a predetermined portion of the loop while rotating the pair of folding rollers. Further, in Japanese Patent Application Laid-Open No. 2002-100002, a loop forming portion is provided below a path for guiding a sheet to the folding rollers, and the veneer forms the path when guiding the leading edge of the sheet to the pair of folding rollers. When a loop is formed in the sheet, the sheet is retracted from the position facing the upper guide to open the path and move to a position where the path and the loop space are communicated. It is designed to

JP 2020-93855 A

In Japanese Unexamined Patent Application Publication No. 2002-100002, an upstream path is provided upstream of the path to guide the sheet toward the loop forming portion in order to facilitate the formation of the loop on the sheet. However, the upstream path that guides the sheet toward the loop forming portion is formed to be inclined with respect to the path, and the connecting portion with the path is bent. In such a curved transport path, paper jams may occur at the curved portion. In particular, there is a problem that paper jams are likely to occur with sheets such as curled paper that have been deformed by image formation by the image forming apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet conveying apparatus capable of reducing sheet conveying defects in a conveying path.

In order to solve the above-described problems, a first invention provides a sheet conveying apparatus including a conveying path including a pair of guide members for guiding a sheet, and conveying means for conveying the sheet along the conveying path. A moving means is provided for moving the guide member of (1) to a first position for forming the conveying path and a second position for opening the conveying path, and the conveying means moves the leading edge of the sheet from the opened conveying path to the outside of the conveying path. The conveying means moves the first guide member from the second position to the first position so as to guide the leading edge of the sheet conveyed outside the conveying path into the conveying path.

A second invention comprises a pair of feed rollers for feeding a sheet, a pair of folding rollers for nipping a predetermined position of the sheet to fold the sheet, a conveying path for guiding the sheet from the pair of feed rollers to the pair of folding rollers, and a pair of feed rollers. and a pair of folding rollers to form a loop in the sheet; a thrusting member that thrusts the sheet with the loop formed thereon and nips the sheet at a predetermined position with the pair of folding rollers; A first position for guiding the sheet, a second position for opening the conveying path so that a loop of the sheet can be formed in the loop forming portion, and a third position for nipping the predetermined position of the sheet between the pair of folding rollers. and a moving means for moving the pushing member to a position, wherein the conveying path includes a first path for guiding the sheet to the pair of folding rollers, and a feeding roller provided upstream of the first path. The pair of feed rollers has a second path that guides the sheet fed in pairs toward the loop space provided outside the first path, and the pair of feed rollers transports the leading edge of the sheet to the loop forming portion and moves. The means moves the pushing member from the second position to the first position so as to guide the leading edge of the sheet conveyed to the loop forming portion into the first path.

According to the present invention, it is possible to reduce sheet conveyance failures in the conveyance path.

1 is a configuration diagram of an entire image forming system including a folding machine as a sheet conveying device of the present invention; FIG. 1 is a configuration diagram showing the main configuration of a folding machine; FIG. FIG. 4 is an explanatory diagram for explaining the configuration of a control system of the folding machine; 4 is a main operation flow chart showing the operation of the folding machine; FIG. FIG. 4 is an operation flowchart showing operations in folding loop processing of the folding machine; FIG. 4 is an operation flowchart showing operations in folding processing of the folding machine; FIG. 11 is a state diagram (part 1) showing a state of a sheet in folding loop processing and folding processing of the folding machine; FIG. 11 is a state diagram (part 2) showing a state of a sheet in folding loop processing and folding processing of the folding machine;

FIG. 1 is a configuration diagram of an entire image forming system provided with a sheet folding device as a sheet conveying device of the present invention. As shown in FIG. 1, a sheet folding device (folding machine) C as a sheet conveying device of the present invention is arranged between an image forming device (copier) A and a sheet binding device (stitching machine) B to Sheets conveyed from the machine A are sent to the binding machine B after being subjected to various folding processes. In the present embodiment, a copier is used as the copier A, and a folding machine C is connected to the discharge port of this copier, and a binding machine B is connected downstream thereof.

In the copier A, an image reading section 4 reads a document sent by a document feeding section 5 , and an image forming section 2 forms an image on a sheet sent from a paper feeding section 3 based on the read image. A relay transport unit 6 is mounted inside the cavity of the copying machine A. As shown in FIG. When the sheet is not folded or bound, the sheet is conveyed to the discharge tray 7 via the first relay path P20. On the other hand, when the sheet is subjected to folding processing or binding processing, the sheet is sent from the discharge roller pair 8 to the folding machine C via the second relay path P21.

The binding machine B discharges the sheets from the first pass P1 to the third pass P3 to the binding processing tray 9a, and staples the sheets on the binding processing tray 9a at two points, i.e., the corners or one side, with the stapler 9b. It is discharged to the second paper discharge tray 12b. When the staple binding process is not performed, the sheet sent from the folding machine C is directly discharged to the first paper discharge tray 12a via the first pass P1 and the second pass P2.

FIG. 2 is a configuration diagram showing the main configuration of the folding machine C. As shown in FIG. FIG. 3 is an explanatory diagram for explaining the configuration of the control system of the folding machine C. As shown in FIG. Folding machine C, as shown in FIG. A folding roller pair 11 is provided for processing. Between the feed roller pair 10 and the folding roller pair 11, as shown in FIG. (push member) 15 and a conveying path 18 for guiding the sheet from the feed roller pair 10 toward the folding roller pair 11 . The sheet folding operation stops after the downstream end of the sheet in the sheet conveying direction is nipped by the nip portion 11 c of the folding roller pair 11 . By feeding the sheet from the feed roller pair 10 in this state, a loop portion having a predetermined length is formed in the loop forming portion 20 . Then, the first folding position of the loop portion set to the first first folding line is guided to the nip portion 11c by the thrust plate 15, and the folding roller pair 11 is rotated in the conveying direction. As a result, a three-fold (Z-fold) process having a first fold and a second fold formed on the upstream side of the first fold is performed.

The feed roller pair 10 is composed of an upper feed roller 10a rotated by a motor drive and a lower feed roller 10b rotated following the rotation of the upper feed roller 10a. The feed roller pair 10 aligns the sheet and conveys it toward the folding roller pair 11 .

The conveying path 18 includes a first conveying path 18a extending horizontally from the nip portion 10c of the feed roller pair 10, a second conveying path 18b extending downward from the downstream side of the first conveying path 18a, and a second conveying path. and a third conveying path 18c extending horizontally from the downstream side of the path 18b to reach the folding roller pair 11. The first conveying path 18 a and the second conveying path 18 b are provided with an upper feed guide 13 , a lower feed guide 14 and a veneer 15 . The third conveying path 18 c is formed by the upper folding guide 16 and the lower folding guide 17 . Further, the folding guide 17 is formed of a horizontal guide portion 17a extending in the horizontal direction, an inclined guide portion 17b inclined, and a vertical guide portion 17c extending in the vertical direction.

The folding roller pair 11 is composed of an upper folding roller 11a and a lower folding roller 11b, and is arranged below a horizontal extension line extending from the nip portion 10c of the feed roller pair 10. As shown in FIG. In other words, the folding roller pair 11 and the feed roller pair 10 are arranged in a vertically displaced state. The folding roller pair 11 nips the leading edge (downstream end) of the sheet conveyed from the feed roller pair 10, and conveys the sheet by nipping a predetermined portion (fold) poked by the thrust plate 15. By doing so, the sheet is Z-folded.

The veneer 15 is a plate-shaped member extending in the sheet width direction and arranged below the feed lower guide 14 . The tip 15a of the veneer 15 enters between the upper fold guide 16 and the lower fold guide 17, and guides the fold of the sheet toward the nip portion 11c of the folding roller pair 11. As shown in FIG. In addition, the veneer 15 faces the downstream side of the feed upper guide 13 and also functions as a guide for forming a part of the third conveying path 18c. Furthermore, the third conveying path 18 c is opened to communicate with the loop forming section 20 . That is, the thrusting plate 15 has a thrusting position PA that folds the fold of the sheet and is nipped by the nip portion 11c of the roller pair 11, a guide position PB that guides the sheet as a part of the third conveying path 18c, and a loop forming space portion 20. to the retracted position PC for forming a loop. The gap in the portion of the third conveying path 18c that uses the veneer 15 as a guide is narrower than the gap in the second conveying path 18b. In the present embodiment, the gap in the portion of the third conveying path 18c guided by the veneer 15 is set to 2.0 mm, and the gap in the second conveying path 18b is set to 4.0 mm. Note that FIG. 2 shows a state in which the veneer 15 is moved to the guide position PB for guiding the sheet as a part of the third conveying path 18c.

A folding section (multiplier) 50 is arranged downstream of the folding roller pair 11 . As shown in FIG. 3, the folding machine 50 includes a folding unit 51 having a plurality of rollers 52 rotatable in the width direction of the sheet perpendicular to the sheet conveying direction, and the folding unit 51. It is provided with a folding motor MT4 and a moving mechanism (not shown) for moving in the vertical direction and the width direction of the sheet. The folding machine 50 can flatten the folds of the sheet by sandwiching and pressing the folds of the sheet conveyed onto the pressing table 59 by the pair of folding rollers 11 with a plurality of rollers 52 .

A control system will be described based on FIG. As shown in FIG. 3, the folding machine C includes an entrance sensor S1 for detecting the leading and trailing edge of the sheet on the upstream side of the feed roller pair 10, and an inlet sensor S1 arranged on the upstream side of the folding roller pair 11 to detect the leading and trailing edge of the sheet to be folded. and a thrust sensor S3 for detecting the movement position of the sliced plate 15 . These sensors detect the positions of the sheet and the veneer 15 .

The folding machine C also includes a feed motor MT1 for driving the upper feed roller 10a via a drive transmission mechanism (not shown), and an upper folding roller 11a of the folding roller pair 11 via a transmission mechanism (not shown). , a folding motor MT2 for driving the lower folding roller 11b, a pushing motor MT3 for moving the thrust plate 15, and an increasing motor MT4 for moving the folding unit 51 in the vertical direction and the width direction of the sheet.

In the present embodiment, the mechanism for moving the sliced plate 15 includes a first rack 30 provided at one end of the sliced plate 15 in the sheet width direction, a second rack 31 provided at the other end, and a second rack 31 provided at the other end. A first pinion 32 meshing with one rack 30 and a second pinion 32 provided coaxially with the first rack 30 and meshing with a second rack 31 are provided. That is, when the thrust motor MT3 is driven, the first pinion 32 rotates. As this first pinion 32 rotates, the second pinion 33 also rotates via shaft 34 . Then, the first rack 30 meshing with the first pinion 32 and the second rack 31 meshing with the second pinion 33 move synchronously. As a result, the veneer 15 reciprocates in the horizontal direction. 3 shows a state in which the veneer 15 is moved to the retreat position PC for forming a loop in the loop forming space 20. As shown in FIG.

The folding machine C is provided with a control unit 100 and receives information such as the sheet type and folding mode set on the operation panel of the copying machine A via the binding machine B. FIG. The control unit 100 controls driving of the motors MT1, MT2, MT3 and MT4 based on various information from the copier A and sheet detection results by the sensors S1, S2 and S3. As a result, the sheet is conveyed and folded. Further, the control unit 100 has a function of transmitting information such as sheet conveying status to the copying machine A via the binding machine B, and notifying the user of a conveying failure of the folding machine C and the like.

FIG. 4 shows the main operation flow of the folding machine C. As shown in FIG. The folding machine C of this embodiment has a "folding" mode in which the sheet is Z-folded and a "no folding" mode in which the sheet is not folded. Triggered by the detection of the leading edge (downstream edge) of the sheet by the inlet sensor S1, sheet information such as sheet size, material, and thickness, and post-processing information such as folding mode are sent from copying machine A to binding machine B. (ST01, ST02). If the acquired information includes information indicating "folded" (ST03), a folding operation setting process for setting various values for folding the sheet based on the sheet information such as the sheet size is executed (ST04), and registration is performed. In the process, the sheet skew is corrected by abutting the leading edge of the sheet against the feed roller pair 10 and aligning it (ST05). Then, a loop portion is formed on the sheet by folding loop processing (ST06), and a predetermined position of the loop portion is poked by the veneer 15 in the folding processing to be nipped by the folding roller pair 11. A second crease is formed (ST07). In this folding process, the folding machine 50 is operated to sequentially apply pressure to the two folds formed by the folding rollers to flatten the bulges of the folds. Finally, in the discharge process, the sheet is carried out to the binding machine B on the downstream side (ST09).

On the other hand, if the acquired information does not include information designating "folded" (ST03), normal processing (unfolded processing) is executed (ST08). In this normal process, the sheets received by the folding machine C are carried out to the binding machine B without performing a series of processes in the folding mode and applying pressure to the fold line by the folding machine 50 (ST09).

Here, in the copier A, the sheet curls (circular deformation) due to the heat and pressure of the fixing device that fixes the image. This curled sheet is likely to cause a paper jam in the curved portion of the conveying path 18 . In particular, since the connecting portion of the second conveying path 18b and the third conveying path 18c uses the sliced plate 15 as a guide, there is a space between the feed lower guide 14 and the sliced plate 15 as shown in FIG. SP occurs, and the tip of the sheet tends to buckle. Furthermore, since the gap of the third conveying path 18c guided by the sliced plate 15 is narrower than the gap of the second conveying path 18b, the leading edge of the sheet is guided from the second conveying path 18b to the third conveying path 18c. paper jams easily.

In the present embodiment, as a countermeasure against such curled sheet conveyance failure, an assist operation is performed by the sliced plate 15 . In this assist operation, as shown in FIG. 7A, the tip of the sheet conveyed by the pair of feed rollers 10 is suspended in the loop space while the thrust plate 15 is at the retracted position PC. Move from PC to guide position PB. As a result, as shown in FIGS. 7(b) and 7(c), the front edge of the sheet hanging in the loop space 20 is scooped up by the veneer 15 and conveyed, so that even a curled sheet can be conveyed satisfactorily. can be transported.

Specifically, the driving amount corresponding to the distance from the nip position of the conveying roller pair 10 to the connecting position of the second conveying path 18b and the third conveying path 18c plus a certain distance is set in advance. Then, when the conveying roller pair 10 starts conveying the sheet and drives a preset driving amount, the thrust plate 15 starts to move. At this time, the moving speed of the thrust plate 15 is set higher than the sheet conveying speed by the conveying roller pair 10 . As a result, the leading edge of the sheet is scooped up by the thrust plate 15 from the state in which it hangs down on the loop forming portion 20, and when the thrust plate 15 reaches the guide position, the sheet is conveyed through the third conveying path 18c. Note that such a configuration can be applied to sheets other than curled sheets, and similar effects can be obtained.

Next, the folding loop processing in which the assist operation described above is executed and the folding processing in which the sheet is folded will be described in detail. FIG. 5 is an operation flowchart of the folding loop process (ST06), and FIG. 6 is an operation flowchart of the folding process (ST07). 7 and 8 are state diagrams showing the state of the sheet in the folding loop processing and the folding processing.

In the folding loop process, first, the feed motor MT1 and the folding motor MT2 are driven to rotate the folding roller pair 11 (ST06-1). As a result, the conveying roller pair 10 starts conveying the sheet whose leading edge has been aligned by the registration process toward the folding roller pair 11 to perform an assist operation. In the assist operation, guide processing for the veneer 15 is executed when the feed motor MT1 starts driving and drives the first set amount (ST06-2, ST06-3). The first set amount is the drive amount of the feed motor MT1 corresponding to the distance from the nip position 10c of the feed roller pair 10 to a predetermined position in the loop forming section 20. FIG. As a result, the sheet is conveyed by the feed roller pair 10, and the leading edge of the sheet hangs down in the loop space 20 as shown in FIG. 7(a).

In the guide process, the thrust motor MT3 is driven to rotate forward, the thrust motor MT is driven by a constant amount, and the thrust motor MT3 is stopped. The fixed amount is the amount of drive for moving the veneer 15 from the retracted position PC to the guide position PB. By driving the thrust motor MT3 by a predetermined drive amount, the thrust plate 15 moves from the retracted position PC to the guide position PB as shown in FIGS. 7(a) to 7(c). At this time, the moving speed of the thrust plate 15 by the thrust motor MT3 is made faster than the sheet conveying speed of the feed roller pair 10 by the feed motor MT2. As a result, as shown in FIGS. 7(b) and 7(c), the leading edge of the sheet hanging in the loop space 20 is scooped up by the thrust plate 15 and conveyed. That is, in this assist operation, as shown in FIGS. 7A to 7C, by moving the veneer 15 toward the guide position PB at the timing when the tip of the sheet hangs down in the loop space 20, The veneer 15 picks up the leading edge of the sheet and conveys the sheet.

Then, when the folding sensor S2 detects the leading edge of the sheet, the cutting board 15 is retracted (ST06-4, ST06-5). Further, when the driving amount of the feed motor MT2 after the folding sensor S2 detects the leading edge of the sheet reaches the second set amount, the folding motor MT2 is stopped (ST06-6, ST06-7). As a result, the leading edge of the sheet stops while being nipped by the pair of folding rollers 11 as shown in FIG. 7(d). The second set amount is the drive amount of the feed motor MT2 required for the leading edge of the sheet to reach the nipping roller pair 11 . In the retraction process, the thrust motor MT3 is reversely driven, and when the thrust sensor S3 detects the detection flag FG of the thrust board 15, the thrust motor MT3 is stopped. As a result, it moves from the guide position PB to the retracted position PC, and the third transport path 18c is opened as shown in FIG. 7(d).

Thereafter, the pair of folding rollers 11 stops while nipping the sheet, and the pair of feed rollers 10 continues feeding the sheet, so that the sheet bends in the loop space 20 as shown in FIG. It is formed. When the folding loop counter counts up, the folding process is executed (ST06-8, ST07). The folding loop counter is determined by the folding position according to the size of the sheet. This is a pair of 10 conveying amounts. The folding position of the sheet is pushed by the cutting plate 15 at the timing when the value of the loop counter is "0", that is, at the timing when it counts up.

Next, the folding process will be described based on the operation flow chart of FIG. 15 thrust processing is executed (ST07-1). In the thrusting process, the thrusting motor MT3 is driven forward to move the thrusting board 15, and when the thrusting board 15 reaches the thrusting position PA, the thrusting motor MT3 is stopped. As a result, the veneer 15 moves toward the folding roller pair 11 while pushing the folding position of the loop portion of the sheet (corresponding to the second folding line in the Z-folded sheet). Then, as shown in FIG. 8(b), the projecting plate 15 enters between the upper fold guide 16 and the lower fold guide 17 of the third path 18c and stops at the thrust position PA. In this embodiment, the feed roller pair 10 continues to feed the sheet even while the thrust plate 15 is moving in the sheet feeding direction, and the moving speed of the thrust plate 15 is the same as the moving speed of the sheet fed by the feed roller pair 10. It is controlled to have the same speed.

When the thrust plate 15 stops at the thrust position PA and the feed motor MT1 has driven the third set amount, the folding motor MT2 is driven (ST07-2, ST07-3). When the folding motor MT2 is driven, the folding roller pair 11 rotates, and the second fold of the sheet positioned in front of the nip portion of the folding roller pair 11 by the thrust plate 15 is caught in the folding roller pair 11 and the sheet is folded. (See FIG. 8(c)). The third set amount is the drive amount of the feed motor MT1 for rotating the feed roller pair 10 until the second fold of the sheet reaches the position where the folding rollers are caught by the thrust plate 15. This amount is the amount of driving of the feed motor MT1. Set based on location.

When the second crease is caught in the folding roller pair 11, the cutting board 15 is retreated (ST07-4). In the retraction process, the thrust motor MT3 is reversely driven as described above, and when the thrust sensor S3 detects the detection flag FG of the thrust plate 15, the thrust motor MT3 is stopped. As a result, the veneer 15 moves to the retracted position PC as shown in FIG. 8(c).

After that, the folding roller pair 11 nips the sheet in a state in which the leading end of the sheet overlaps the front and rear portions of the second fold, and sends the sheet downstream. Thereby, the sheet loop in the loop space 20 gradually becomes smaller, and when the first fold is nipped by the folding roller pair 11, a Z-fold sheet is produced.

Then, when the entrance sensor S1 detects the trailing edge of the sheet, guide processing is executed (ST07-5, ST07-6). Although not shown, this guide process moves the veneer 15 to the guide position PB to support the trailing edge of the conveyed sheet and prevent the trailing edge of the sheet from hanging down in the loop forming portion 20 . When the guide process is executed, the two folds of the sheet have already passed the pair of folding rollers 11 and the sheet is not present in the loop forming section 20 .

Finally, the trailing edge of the Z-folded sheet is detected by the folding sensor S2, and the folding motor MT2 is driven by a predetermined amount. At the same time, the feed motor MT1 and the folding motor MT2 are stopped. (ST07-7 to ST07-10). As a result, the sliced plate 15 moves from the guide position PB to the retracted position PC, and the rotation of the feed roller pair 10 and folding roller pair 11 is stopped.

In the above explanation of the folding process, the operation of applying pressure to the first and second folds by the folding machine 50 was omitted for the sake of convenience. Each time the first fold reaches the additional folding position PP shown in FIG. 2, the sheet is temporarily stopped and the additional folding is performed by the folding machine 50 .

Note that the assist operation may be executed according to the type of sheet or the state of the sheet. For example, since cardboard is less likely to curl, if the cardboard cannot be folded, the veneer sheet is applied after the registration process is completed and before the loop formation process is executed, that is, before step 06-1 (ST06-1) is executed. 15 guide processing is executed. As a result, since the thrust plate 15 is moved to the guide position PB when the sheet is started to be conveyed by the feed roller pair 10, the sheet can be conveyed without any trouble. In this manner, the assist operation is performed for thin paper and plain paper, and the assist operation is not performed for thick paper that is less likely to curl. can be made smaller. Further, as an example of execution depending on the state of the sheet, it is possible to recognize the state of curl, perform the assist operation when the curl is large, and not perform the assist operation when the curl is small.

As described above, the present invention has been described in relation to the preferred embodiments, but the present invention is not limited to the above embodiments, and can be implemented with various changes or modifications within its technical scope. Needless to say.

A Copier C Folding machine 10 Feed roller pair 11 Fold roller pair 13 Feed upper guide 14 Feed lower guide 15 Veneer plate 16 Fold upper guide 17 Fold lower guide 18 Conveying path 18a First conveying path 18b Second conveying path 18c Third conveying Path 20 Loop forming section 30 First rack 31 Second rack 32 First pinion 33 Second pinion 100 Control section MT1 Feed motor MT2 Folding motor MT3 Pushing motor S1 Entrance sensor S2 Folding sensor S3 Pushing sensor

Claims (7)

A sheet conveying apparatus comprising: a conveying path including a pair of guide members for guiding a sheet; and conveying means for conveying the sheet along the conveying path,
moving means for moving one of the pair of guide members to a first position that forms the transport path and a second position that opens the transport path;
The conveying means conveys the leading edge of the sheet from the open conveying path to the outside of the conveying path, and the moving means guides the leading edge of the sheet conveyed outside the conveying path into the conveying path. A sheet conveying device for moving the first guide member from the second position to the first position. 2. A sheet conveying apparatus according to claim 1, wherein said moving means moves said one guide member along said conveying path. The one guide member is provided below the other guide member,
2. The sheet conveying apparatus according to claim 1, wherein the conveying means suspends the leading edge of the sheet outside the conveying path. an upstream transport path for guiding a sheet to the transport path on the upstream side of the transport path;
2. A sheet conveying apparatus according to claim 1, wherein a connecting portion connecting said upstream conveying path and said conveying path is curved. a feed roller pair for feeding the sheet;
a folding roller pair that nips a predetermined position of the sheet to fold the sheet;
a conveying path for guiding the sheet from the pair of feed rollers to the pair of folding rollers;
a loop space forming a loop in the sheet between the pair of feed rollers and the pair of folding rollers;
a thrusting member for thrusting the looped sheet and nipping it at a predetermined position with the pair of folding rollers;
a first position forming part of the conveying path and guiding the sheet; a second position opening the conveying path so that a loop of the sheet can be formed in the loop forming portion; moving means for moving the pushing member to a third position where the folding roller pair nips the position;
In a sheet conveying device comprising
The transport path includes a first path that guides the sheet to the pair of folding rollers, and a path that is provided upstream of the first path and provided outside the first path for the sheet fed by the pair of feed rollers. and a second route that guides toward the loop space,
The feed roller pair conveys the leading edge of the sheet to the loop forming section, and the moving means moves the pushing member so as to guide the leading edge of the sheet conveyed to the loop forming section into the first path. A sheet conveying device for moving from a second position to a first position. 3. The second path guides the sheet in a direction intersecting the sheet guiding direction of the first path, and a connecting portion between the first path and the second path forms a curved path. 5. The sheet conveying device according to 5. 7. The sheet conveying apparatus according to claim 6, wherein the loop space portion is provided outside the curved connecting portion of the first path and the second path.

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