JP4445899B2 - Paper folding apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet folding device and an image forming apparatus for folding a sheet.

  In Patent Document 1, in the paper folding apparatus, at least a pair of rotating members that are driven in synchronization with each other are provided along the paper conveyance path, and grooves and protrusions for crease the paper are provided on each of the rotating members. Technology is disclosed.

  In Patent Document 2, the sheet conveyed by the sheet conveying unit is turned up by the end face folding member, and the bent portion of the turned up sheet is inserted into the nip portion of the roller pair so that a crease is formed on the end face of the sheet. The technique to attach is disclosed.

Japanese Patent No. 2849914 Utility Model Registration No. 2524155

  However, in the conventional technique described in Patent Document 1, each rotating member rotates to pinch the paper, thereby forming a crease, and stacking the paper along the crease in a paper storage unit installed below the rotating member pair. Therefore, there is a problem that it is difficult to cleanly crease.

  On the other hand, in the prior art described in Patent Document 2, the end of the paper is turned up by an end face folding member that scoops up the end face of the paper, and is inserted into the nip portion of the roller pair from the curved portion of the turned up paper. Therefore, it is difficult to insert into the nip portion, and the angle of the crease may vary, or wrinkles may occur and bend.

  It is an object of the present invention to obtain a paper folding device and an image forming apparatus that can fold paper reliably.

In order to solve the above-mentioned problem, the invention described in claim 1 is a sheet conveying unit that conveys a sheet, a first folding unit that folds the sheet, and a sheet that is creased by the first folding unit. In the paper folding apparatus including the second folding means for folding the first folding means, the first folding means is a first rotating member pair and a second rotating member pair provided on the downstream side of the first rotating member pair in the paper conveying direction. And the first rotating member pair and the second rotating member pair each have one rotating member having a protrusion and the other rotating member having a groove, and when the sheet is creased, The sheet is conveyed between the rotating member pair and the second rotating member pair, and the protrusion of one rotating member and the groove of the other rotating member are fitted in the first rotating member pair, and the second rotating member pair. In which the protrusion of one rotating member and the groove of the other rotating member fit together When the crease and the valley-shaped crease are made and the paper is not made crease, the first rotary member pair and the second rotary member pair stop the rotation of each rotary member, and the first rotary member A sheet conveyance guide path is provided between the pair and the second rotating member pair .

In order to solve the above-mentioned problem, the invention described in claim 2 is a sheet conveying unit that conveys a sheet, a first folding unit that folds the sheet, and a sheet that is creased by the first folding unit. In the paper folding apparatus including the second folding means for folding the first folding means, the first folding means is a first rotating member pair and a second rotating member pair provided on the downstream side of the first rotating member pair in the paper conveying direction. The first rotating member pair and the second rotating member pair each have one rotating member having a protrusion and the other rotating member having a groove, and the first rotating member pair and the second rotating member The sheet is conveyed between the pair of rotating members, the protrusion of one rotating member and the groove of the other rotating member are fitted in the first rotating member pair, and the protrusion of one rotating member in the second rotating member pair And the groove of the other rotating member is fitted to the paper, Creased shape, is provided with conveying rollers between the first folding means and second folding means, characterized in that the conveying rollers are provided in a plurality along the rotation axis direction And

In order to solve the above-mentioned problem, the invention described in claim 3 is a sheet conveying unit that conveys a sheet, a first folding unit that folds the sheet, and a sheet that is creased by the first folding unit. In the paper folding apparatus including the second folding means for folding the first folding means, the first folding means is a first rotating member pair and a second rotating member pair provided on the downstream side of the first rotating member pair in the paper conveying direction. The first rotating member pair and the second rotating member pair each have one rotating member having a protrusion and the other cylindrical rotating member, and the first rotating member pair and the second rotating member pair, respectively. The sheet is conveyed between the pair of rotating members, and the protrusion of one rotating member in the first rotating member pair bites into the other rotating member, and the protrusion of one rotating member in the second rotating member pair rotates the other. The paper has a chevron-shaped crease and a trough-shaped Ri with the eyes, to the rotary shaft of the one rotary member has a plurality of rollers are provided, and wherein the carrying the sheet by the roller is rotated.

In order to solve the above-mentioned problem, the invention described in claim 4 is a sheet conveying means for conveying the sheet, a first folding means for folding the sheet, and a sheet that has been folded by the first folding means. And a second folding unit that folds the sheet, the first folding unit has a crease on the end surface of the sheet, and the second folding unit has a fold line formed by the first folding unit. The end surface is further folded, and the first folding means includes one rotating member having a protrusion and the other rotating member having a groove, and the protrusion of one rotating member and the groove of the other rotating member are fitted. In this case, the end face of the sheet is creased, the groove formed in the other rotating member has a substantially V-shaped cross section, and an elastic member is provided on one wall of the groove .

In order to solve the above-mentioned problem, the invention described in claim 5 is a sheet conveying means for conveying a sheet, a first folding means for folding a sheet, and a sheet that has been folded by the first folding means. And a second folding unit that folds the sheet, the first folding unit has a crease on the end surface of the sheet, and the second folding unit has a fold line formed by the first folding unit. The end surface is further folded, and the first folding means includes one rotating member having a protrusion and the other rotating member having a groove, and the protrusion of one rotating member and the groove of the other rotating member are fitted. In addition, the end face of the sheet is creased, and the rotation angle of each rotation member of the one rotation member and the other rotation member is freely changeable with respect to the sheet conveyance direction .

In order to solve the above-described problem, the invention described in claim 6 is a sheet conveying unit that conveys a sheet, a first folding unit that folds the sheet, and a sheet that is creased by the first folding unit. And a second folding unit that folds the sheet, the first folding unit has a crease on the end surface of the sheet, and the second folding unit has a fold line formed by the first folding unit. The end surface is further folded, and the first folding means includes one rotating member having a protrusion and the other rotating member having a groove, and the protrusion of one rotating member and the groove of the other rotating member are fitted. The end face of the paper is creased, and one rotating member cuts out a part of the arc shape on the downstream side in the paper transport direction, and when the end face of the paper is bent, Avoid contact with rotating members And characterized in that it.

In order to solve the above-mentioned problem, the invention described in claim 7 is a sheet conveying unit that conveys a sheet, a first folding unit that folds the sheet, and a sheet that is creased by the first folding unit. And a second folding unit that folds the sheet, the first folding unit has a crease on the end surface of the sheet, and the second folding unit has a fold line formed by the first folding unit. The end face is further folded, and the second folding means includes a pair of folding rollers that grips the fold formed by the first folding means and further folds the end face of the paper, and includes a pair of folding rollers. It is characterized in that the surface friction is reduced, and the paper gripped by the pair of folding rollers is easy to slip .

The invention described in claim 8 is an image forming apparatus including the sheet folding device according to any one of claims 1 to 7 .

  According to the present invention, since the first folding means for folding the paper and the second folding portion for further folding the paper along the crease made by the first folding means are provided, for example, a thick waist Even if the paper is strong, the paper can be reliably folded by using two folding means.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First, the first embodiment will be described with reference to FIGS. FIG. 1 is a side view schematically showing a copying machine according to the first embodiment, FIG. 2 is an enlarged side view showing a main part of the sheet folding apparatus shown in FIG. 1, and FIGS. FIG. 9 is a plan view showing a roller pair on the upstream side of the first folding means, and FIG. 10 is a plan view showing a roller pair on the downstream side of the first folding means. FIG. 11 is a control block diagram according to the first embodiment, and FIG. 12 is a flowchart showing a sheet conveying operation according to the first embodiment.

  First, the overall configuration will be described with reference to FIG. As shown in FIG. 1, a sheet folding apparatus 1 according to the present embodiment is provided adjacent to a copying machine main body 200 on which image formation is performed. The sheet folding apparatus 1 includes a sheet conveying unit (sheet conveying unit) 2 that conveys the sheet discharged from the copier apparatus main body 200, and a first bellows folding unit (first item) that folds the sheet in a direction perpendicular to the conveying direction. 1 folding means) 3, a second bellows folding section (second folding means) 4 that folds the paper in a bellows shape along the crease formed by the first bellows folding section 3, and a second bellows folding section 4. The cross-folding unit 5 folds the paper folded in a bellows shape in the vertical direction to the size of A4, and the stacker unit 6 that discharges and stacks the paper folded in the size of A4.

  An image reading device 205 is disposed in the copying machine main body 200, and a manual sheet feeding table 208 is disposed below the image reading device 205. The paper set on the manual paper feed tray 208 is temporarily stopped by the registration roller 207 and is supplied to the image forming unit 206 at a timing. The image forming unit 206 forms a latent image corresponding to the image data on the photosensitive member, develops the latent image with toner, transfers the toner to a sheet of paper, and fixes it by the fixing device 210. The paper P on which the toner is fixed by the fixing device 210 is discharged to the paper insertion opening A of the paper folding device 1 by the paper discharge roller 211. Thereafter, the paper P is transported by the paper transport unit 2 to the first bellows folding unit 3, and a crease is formed in a direction perpendicular to the transporting direction of the paper P. The second bellows folding unit 4 feeds the paper along the fold. Folded into bellows. Further, the paper P folded in a bellows shape is conveyed in a direction perpendicular to the conveying direction at the time of the bellows folding, folded to the size of A4 by the cross folding part 5, discharged to the stacker part 6, and stacked.

  Next, the configuration of the bellows folding portion will be described. The first bellows folding unit 3 includes a first folding roller pair (first rotating member pair) and a second folding roller pair (second rotating member) provided on the downstream side of the first folding roller pair in the sheet conveying direction. The first folding roller pair has one rotating roller (rotating member) 16 having a projection 16c and the other rotating roller (rotating member) 17 having a groove 17c, and the second folding roller The pair has one rotating roller (rotating member) 19 having a protrusion 19c and the other rotating roller (rotating member) 18 having a groove 18c. Further, a pair of conveying rollers 20 and 21 are provided downstream of the second folding roller pair so as to convey the creased paper to the second bellows folding unit 4.

  The second bellows folding unit 4 is provided with a sheet switching port 22 provided so as to be movable in the left-right direction, and on the downstream side of the sheet switching port 22, the second folding roller right pair 23, 24 and the second folding roller left pair 25, 26 Is provided. In the second bellows folding section 4, the creased paper is folded.

  Next, a control block diagram according to the present embodiment will be described. As shown in FIG. 11, the copying machine 200 includes a main body operation unit 201 and a main body control board 202, which are connected to the paper folding controller 100 on the paper folding apparatus 1 side. The sheet folding apparatus 1 includes detection sensors (start detection sensor 11, first fold detection sensor 15, second fold detection sensor right 27, second fold detection sensor left 28, first fold roller HP sensor (1) 36, The 1-fold roller HP sensor (2) 42) and the paper folding controller 100 are connected. The paper folding controller 100 includes a paper discharge switching solenoid 50, a transport motor 51, a first folding motor (1) 31, a first folding motor (2) 37, a first folding roller clutch (1) 43, and a first folding roller clutch. (2) 44, the switching guide solenoid right 52, the switching guide solenoid left 53, and the second folding motor 54 are connected.

Next, the actions and effects of the sheet folding apparatus according to the present embodiment will be described with reference to FIGS.
It demonstrates using the flowchart of these. After the sheet conveyed from the copying machine main body 200 is inserted into the sheet insertion opening A of the sheet folding apparatus 1, when the leading edge of the sheet P reaches the start detection sensor 11, the rotation operation of the conveyance motor 51 starts, and the sheet P is transported by transport roller pairs 12 and 13. When paper folding is not performed, the paper discharge switching solenoid 50 is operated to change the direction of the paper discharge switching claw, and the paper is discharged from the discharge port B, and the transport motor 51 stops after t1 seconds (S1 to S5). When paper folding is performed, the paper discharge switching solenoid 50 does not operate, and the paper P passes through the transport roller pair 14 and is transported to the first bellows folding unit 3 (FIG. 3, S6 to S8). The rotating operation of the first folding motor (1) 31 starts t2 seconds after the leading edge of the paper P reaches the first folding detection sensor 15, and the first folding roller pair 16, 17 is driven (S9 to S10). By being sandwiched between a protrusion that is provided in a straight line in the horizontal direction with respect to one rotating roller 16 and a groove that is provided in a straight line in the horizontal direction with respect to the other rotating roller 17, D is formed. The folding width can be changed by changing the rotation operation start timing t2 of the first folding motor (1) 31 after the leading edge of the paper P reaches the first folding detection sensor 15.

  The first folding motor (1) 31 is configured to be stopped by a first folding roller HP detection plate 35 and a first folding roller HP sensor (1) 36 at the ends of the first folding roller pair 16, 17. When the first folding motor (1) 31 starts rotating, the first folding roller pair 16, 17 is driven via the first folding roller drive belt 32, the right drive gear 33, and the left drive gear 34. Since the first folding roller HP detection plate 35 is also rotated at the same time, the first folding roller HP sensor (1) 36 sends an ON signal. When the first folding roller HP sensor (1) 36 rotates once, the first folding roller HP sensor is again applied to the first folding roller HP detection plate 35. (1) 36 is shielded from light and sends an OFF signal to stop the rotation of the first folding motor (1) 31 (S11 to S13).

  The paper P is folded at the fold D by the second bellows fold 4 after the fold D is formed by the first bellows fold 3. The second bellows folding section 4 has a configuration in which two roller pairs are arranged with a space therebetween, and the paper P is folded into a bellows shape by reciprocating between the roller pairs. After t2 seconds after the leading edge of the paper P reaches the first folding detection sensor 15, an ON operation of the switching guide solenoid right 52 (not shown) and a forward rotation operation of the second folding motor 54 are simultaneously started (S10). The sheet P is guided to the sheet switching port 22 and added to the second pair of right folding rollers 23 and 24, and the leading edge of the sheet is conveyed to the second folding detection sensor right 27 (FIG. 5).

  The switching guide solenoid right 52 is turned off t3 seconds after the leading edge of the paper P reaches the second folding detection sensor right 27, and the paper switching port 22 is directed leftward by the ON operation of the switching guide solenoid left 53. The reverse rotation operation of the second folding motor 54 is started, and the sheet P is folded at the first bellows folding unit 3 by the conveyance force from the conveyance roller pair 14 and the conveyance force from the second folding roller right pair 23, 24. It is conveyed while forming a loop with D as the tip, and is eventually added to the second folding roller left pair 25, 26 from the fold line D (FIG. 6, S14 to S15).

  As a result, the sheet P continues to be conveyed while being completely folded based on the crease D, conveyed to the upper side of the second fold detection sensor left 28, and again after 4 seconds from the arrival of the sensor, the switching guide solenoid left 53 OFF operation, the switching guide solenoid right 52 ON. By the operation, the sheet switching port 22 is directed rightward, and the second folding motor 54 forward rotation operation is started. When the folding is not repeated, the sheet P is folded in two and the second folding roller right pair 23 and 24 and a pair of paper transport rollers 29 are transported from the discharge port C to the cross-folding section 5, and after the rear end of the paper P passes over the second fold detection sensor right 27, the switching guide solenoid right 52 OFF operation, the second fold The bellows folding is finished by stopping the motor 54 (S16 to S19).

  In the case of repeated folding, before the second folding roller left pair 25, 26 is added, the first folding motor (2) 37 starts rotating, and the second folding roller pair 18, 19 is driven. Then, it is sandwiched between a protrusion that is provided in a straight line in the horizontal direction with respect to one rotating roller 19 and a groove that is provided in a straight line in the horizontal direction with respect to the other rotating roller. A character-shaped fold E is formed (FIG. 7, S16 to S23).

  Thereafter, in the same manner as described above, the fold D is added by the second pair of left folding rollers 25 and 26, and continues to be conveyed while being folded. After the second folding detection sensor left 28 reaches t3 seconds, the switching guide solenoid left 53 OFF operation, the switching guide With the solenoid right 52 ON operation, the sheet switching port 22 is directed rightward, and the second folding motor 54 forward rotation operation is started, and the sheet P is conveyed by the sheet conveying roller pair 14 and the second folding roller left pair 25, 26. Is conveyed while forming a loop with the fold line E formed at the first bellows fold part 3 as the tip, and is finally added to the second pair of right folding rollers 23 and 24 from the fold line E (FIG. 7). ).

  Thereafter, when the folding is not repeatedly performed, the sheet is conveyed from the discharge port C to the cross folding unit 5 by the pair of sheet conveying rollers 29 and the rear end of the sheet P passes over the second folding detection sensor right 27 as described above. The bellows folding is terminated by the switching guide solenoid right 52 OFF operation and the second folding motor 54 stopping (S24 to S19). Further, when repeatedly folding A0 large format paper or the like, by repeatedly performing the above-described operation, the paper P can be folded in the direction of the crease and folded into a bellows shape.

  As described above, in the paper folding apparatus according to the present embodiment, the paper is further fed along the first bellows fold portion 3 that folds the paper and the folds formed by the first bellows fold portion 3. Since the second bellows fold part 4 to be folded is provided, even a large sheet can be surely creased in a desired size and finished with a small thickness after folding.

  The first bellows folding section 3 includes a first folding roller pair 16 and 17 and a second folding roller pair 18 and 19, and a sheet-shaped crease is formed on one sheet by passing the sheet between the pair of rollers. And the valley-shaped folds are provided with two types of creases, and the bellows can be folded with only one pair of folding rollers.

Next, other embodiments will be described. In the description, parts having the same functions and effects as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.
A second embodiment will be described with reference to FIGS. FIG. 13 is a plan view of the first folding roller pair according to the second embodiment, FIG. 14 is a plan view of the second folding roller pair according to the second embodiment, and FIG. 15 is according to the second embodiment. 6 shows a flowchart of a sheet transport operation.

  The first bellows folding unit 3 has a first folding roller pair 16, 17 and a second folding roller pair 18, 19 having the same configuration as that of the first embodiment, and the sheet conveying roller pair used in the first embodiment. 14, 20, and 21 are omitted, and instead, the first folding roller pair 16, 17 and the second folding roller pair 18, 19 play a role of paper conveyance.

  As shown in FIG. 13, one rotating roller 16 in the first folding roller pair 16, 17 is composed of a roller 16a having a protrusion and a plurality of rollers 16b provided at appropriate intervals on the roller shaft. ing. Also, in the second folding roller pair 18, 19, the other rotating roller 18 is composed of a roller 18a provided with a protrusion and a plurality of rollers 18b provided at appropriate intervals on the roller shaft.

  In addition, a one-rotation clutch that stops operation with only one rotation by one ON signal is attached to the end of one rotation roller 16 in the first folding roller pair 16, 17. The first folding roller pair 16, 17 is driven via the attached gear pulley 34 and drive belt 32. In the first embodiment, the first folding roller pair 16 and 17 are rotated and stopped by turning the first folding motor (1) 31 on and off. Since it is used as a paper transport roller, folding is performed by turning on and off the one-rotation clutch described above. The second folding roller pair 18 and 19 has the same configuration and operation method as the first folding roller pair 16 and 17.

  In the present embodiment, one rotating roller 16 in the first folding roller pair 16, 17 is composed of a roller 16a having a protrusion and a plurality of rollers 16b (also in the second folding roller pair 18, 19). The other rotating roller 18 is composed of a roller 18a having protrusions and a plurality of rollers 18b), so that it can be used not only for creasing but also as a sheet conveying roller. Therefore, it can be made inexpensive and small.

  Next, a third embodiment will be described with reference to FIGS. 16 is a side view of the first folding roller pair according to the third embodiment, FIG. 17 is a plan view of the first folding roller pair, and FIGS. 18 to 20 are operations of the sheet folding device according to the third embodiment. FIG.

  The first bellows folding section 3 is composed of only the first folding roller pair 16 and 17, and both a mountain fold and a valley fold can be made on one sheet of paper P with only one pair of rollers. It is. The one and the other rotating rollers 16 and 17 are substantially square, and one rotating roller 16 has a protrusion as in the first embodiment, and has a groove on the opposite side of the protrusion 180 °. Yes.

  Furthermore, the roller surface shape at 90 ° from the surface on which the protrusions and grooves are formed is in the direction of paper conveyance when the concavo-convex axis is positioned at a right angle, that is, when the crease operation is not performed. It has a flat shape so as to be parallel to each other. The other rotating roller 17 has the same shape as the one rotating roller 16, but the mounting direction differs from that of the one rotating roller 16 at the position where the protrusion and the groove are formed. The driving method is the same as that of the first embodiment, but the shape of the first folding roller HP detection plate 35 is different. In the first embodiment, when the sheet is creased, one rotation of the roller is one operation. In order to crease both the mountain fold and the valley fold on one sheet P, two pairs of folds are made. Although a pair of rollers is necessary, in the present embodiment, one operation is performed by half rotation of the roller. Therefore, the first folding roller HP sensor 36 is extended by extending the first folding roller HP detection plate 35 to the opposite side by 180 °. In this case, detection can be performed every half rotation of the roller, and ON / OFF operation of the first folding motor (1) 31 can be controlled every half rotation of the roller.

  Next, a fourth embodiment will be described. As shown in FIGS. 21 and 22, in any of the first folding roller pair 16, 17 and the second folding roller pair 18, 19, one rotating roller 16, 19 and the other rotating roller 17, 18 are The rotation shaft is provided so as to be shifted from the center position of the rotation roller, and one rotation roller 16, 19 and the other rotation roller 17, 18 are eccentrically rotated.

  As described above, the rotation shaft is shifted from the center position of the rotation roller, and the one rotation rollers 16 and 19 and the other rotation rollers 17 and 18 are eccentrically rotated. Therefore, it is possible to make a crease with higher accuracy.

  Next, a fifth embodiment will be described with reference to FIG. As shown in FIG. 23, in the first folding roller pair 16, 17 and the second folding roller pair 18, 19, the roller surface on the opposite side to the concavo-convex portions (protrusions, grooves) attached to each roller. The shape is flat so as to be parallel to the paper transport direction. Thus, since the roller surface shape on the opposite side to the concavo-convex portion attached to each roller is made flat so as to be parallel to the paper transport direction, the first folding roller pair 16, When the 17 and the second folding roller pair 18, 19 are stopped, the space between the roller pair can be used as a sheet conveying guide, and when the sheet passes between the roller pair when the crease is not performed. Therefore, the paper can be prevented from being caught and smoothly conveyed.

  Next, a sixth embodiment will be described with reference to FIG. In the conveying roller pair 20 and 21 provided on the downstream side of the second folding roller pair 18 and 19, one roller has a skewer shape in which a plurality of rollers are arranged along the axial direction. Thus, since at least one of the pair of rollers for conveying the sheet from the first bellows folding section 3 to the second bellows folding section 4 has a skewer shape, it is attached at the first bellows folding section 3. When the folded fold is transported to the second bellows folding section 4, it can be transported without crushing the fold, so that it can be folded according to the fold attached at the first bellows folding section 3, and the thickness after folding is thin. Can be finished in the state.

  Next, a seventh embodiment will be described with reference to FIG. In the seventh embodiment, in the first bellows folding section 3, one rotating roller 16 in the first folding roller pair 16, 17 has the same configuration as in the first embodiment, and has a protrusion on a SUS shaft. It has a configuration in which cylindrical rubber is press-fitted. The other rotating roller 17 has a structure in which a cylindrical rubber having a groove is pressed into a shaft made of SUS. The cylindrical rubber used in the other rotating roller 17 is softer than the cylindrical rubber of one rotating roller 16. I use it. In this way, when the cylindrical rubber used in the other rotating roller 17 is softer than the cylindrical rubber of the one rotating roller 16, when the protrusion and the groove are fitted and the sheet is creased, After the protrusion is fitted into the groove, the protrusion can be further pushed in, the protrusion and the groove are more closely attached, and the crease can be made more reliably and accurately. Note that the second folding roller pair 18, 19 has the same configuration as the first folding roller pair 16, 17.

  Next, an eighth embodiment will be described with reference to FIGS. In the eighth embodiment, in the first bellows folding section 3, one rotating roller 16 in the first folding roller pair 16, 17 has the same configuration as that of the first embodiment, and has a protrusion on a SUS shaft. It has a configuration in which cylindrical rubber is press-fitted. The other rotating roller 17 is configured by press-fitting a cylindrical rubber that is generally used for a shaft made of SUS, and the cylindrical rubber used in the other rotating roller 17 is more than the cylindrical rubber of one rotating roller 16. A soft one is used. Thus, instead of the rotating roller having a groove, a roller that does not have a groove that is usually used is used, so that when the crease is made, the protrusion bites into the surface of the counterpart roller (the other rotating roller 17), It can crease more accurately and accurately, and uses a general roller rather than a special roller with grooves, so the position where the protrusion bites can be any position of the counterpart roller, and one rotating roller Even when there is a rotational difference between 16 and the other rotating roller 17, the creases can always be made with high accuracy. Note that the second folding roller pair 18, 19 has the same configuration as the first folding roller pair 16, 17.

  Next, a ninth embodiment will be described with reference to FIGS. In the ninth embodiment, in the first bellows folding section 3, the shape of the groove formed in the other rotating roller 17 in the first folding roller pair 16, 17 is different from that used in the first embodiment. Yes. As shown in FIG. 28, an angle formed by one wall forming the groove and the other wall (a drawing (θ) extracted and enlarged by a one-dot chain line in FIG. 28 is an obtuse angle). In addition, since the angle formed by the one wall and the other wall forming the groove is an obtuse angle, an extra crease that is likely to occur at the nip between the rollers occurs when the crease is applied to the paper. Can be prevented, and the crease can be more accurately and accurately made.

  Next, a tenth embodiment will be described with reference to FIGS. In the sheet folding apparatus 1 according to the tenth embodiment, an end surface folding portion (first folding means) 70 for folding the end surface of the leading end of the sheet is provided. After the end surface folding portion 70 creases the leading end of the sheet, the bellows The folding unit 80 has a bellows-like crease in the sheet conveyance direction. Further, the paper folded in a bellows shape is folded into an A4 size at the cross fold 5 and then stacked on the stacker 6. When folding the paper at the end face folding section 70, the paper is discharged to the paper folding apparatus 1 by the paper discharge roller 211, passed through the connecting section 60, sent by the pair of entrance conveying rollers 71 of the end face folding section 70, and the paper end face is In the case of folding, the end face folding unit 70 can fold the end face of the paper. At this time, there are a case where the end face of the sheet is folded while the sheet is conveyed and a case where the end face of the sheet is folded after the conveyance of the sheet is temporarily stopped. When the paper end surface is temporarily stopped and the paper end face is folded, when the rear end of the paper is applied to the copying machine main body 200, the paper is continuously conveyed on the copying machine main body 200 side as shown in FIG. 61 is movable, and when the sheet is slack, the entrance guide plate 61 is moved from the position of the broken line to the position of the solid line, so that the sheet is discharged from the copying machine main body 200 side while the leading end is stopped. It has become. Since the configuration of the copying machine main body 200 is the same as that of the first to ninth embodiments described above, the same reference numerals are given and detailed description thereof is omitted.

  Next, the end face folding portion 70 will be described with reference to FIG. FIG. 31 is an enlarged view showing the end face folding portion 70 in FIG. 30, and FIG. 37 is a plan view of the end face folding portion 70. As shown in FIG. 37, a leading edge detection sensor 72 for detecting the leading edge of the sheet is disposed in the vicinity of the center of the downstream side of the entrance conveying roller pair 71, and a fold of the end face fold is formed at the further downstream position in the sheet conveying direction. End face folding rollers 73 and 74 having the roller shaft center arranged at the same angle as the angle Q are configured. At a position further downstream of the end face folding rollers 73 and 74, a folding roller pair 75 is disposed in which the sheet conveying direction and the roller axis center are arranged perpendicularly. A pulley 98 is fixed to the entrance conveyance roller pair 71, and a pulley 91 is also fixed to the folding roller pair 75. The pulleys 91 and 98 are connected by a drive belt 92, and the pulley 98 of the entrance transport roller 71 is connected via a drive belt 99 and a pulley 101 fixed to the transport motor 110. The folding roller pair 75 and the entrance conveyance roller pair 71 are rotated and stopped by driving the conveyance motor 110.

As shown in FIG. 31, the pair of end surface folding rollers 73 and 74 includes one end surface folding roller 73 having a protrusion 73a and the other end surface folding roller 74 having a groove 74a, and the protrusion 73a fits into the groove 74a. Thus, a crease is added to the end face of the paper. One end surface folding roller 73 is formed with a flat support portion 73c that is formed flat, and the other end surface folding roller 74 is also formed with a flat portion 74c. When the paper is transported, the flat portions 73c and 74c are parallel to the transport path and are waiting at a position where the paper does not interfere with the transport. Therefore, when the end face folding is not performed, the end face folding rollers 73 and 74 maintain the positions shown in FIG. Further, gears 95 and 96 are fixed to the end face folding rollers 73 and 74, respectively, and the gear 95 is connected to a gear 76 fixed to the end face folding motor 93.
Therefore, the end face folding rollers 73 and 74 are rotated and stopped by the end face folding motor 93.

  Further, as shown in FIG. 37, one end surface folding roller 73 is provided with a key-shaped light shielding portion 73d, and this light shielding portion 73d serves as a home position sensor (hereinafter referred to as HP sensor) 97 as an end surface folding roller 73, Light is shielded at the standby position 74, and the standby position is detected by the HP sensor 97 transmitting an ON signal.

  Further, as shown in FIG. 37, the end face folding rollers 73 and 74 can be moved and adjusted to the position of the broken line, and the arrangement angle of the end face folding rollers 73 and 74 is indicated by Q ′ from the angle indicated by Q in the figure. When the angle is changed, the angle of the fold of the end face fold can be changed to Q ′.

  Next, a control block diagram of the conveying operation according to the tenth embodiment will be described with reference to FIG. The operation unit 201 configured in the copier apparatus main body 200 allows the user to select whether to fold or not fold the sheet, and to perform an input operation to fold or not fold the end face when folding the sheet. The input signal is transmitted to the main body control board 202, and further, the signal is transmitted to the paper folding controller 100 configured in the paper folding apparatus 1 to control the paper folding operation. Further, the end folding is controlled by the paper folding controller 100, and the rotation and stop control of the ear fold motor (end fold motor) 93 and the transport motor 110 is performed based on the input signals of the leading edge detection sensor 72 and the HP sensor 97. .

  Next, the effect of 10th Embodiment is demonstrated using the flowchart of FIGS. 31-36 and FIG. First, when an end face folding signal is input to the operation unit 201 on the main body side (S0), the signal is input to the paper folding controller 100 via the main body control board 202. Therefore, the paper folding controller 100 checks the signal of the HP sensor to determine whether the end face folding rollers 73 and 74 are in the standby position (S1). If the HP sensor 97 is not ON, the end face folding motor 93 is rotated (S2). When the folding rollers 73 and 74 come to the standby position, the HP sensor 97 is turned on (S3), and the end surface folding motor 93 is stopped (S4). In this state, the conveyance motor 110 starts to rotate (S5), and as shown in FIG. 31, the folding roller 75 and the entrance conveyance roller 71 rotate in the direction of the arrow, and the sheet is fed by the discharge roller 211 of the copier apparatus main body 200. Wait for.

  When the sheet reaches the entrance conveying roller 71 as shown in FIG. 31 and the leading edge detection sensor 72 is turned on at the leading edge of the sheet (S6), the projections and grooves of the end surface folding rollers 73 and 74 are fitted at the position of the end surface fold tn. After a second, the end face folding motor 93 also starts to rotate, and the end face folding rollers 73 and 74 start to rotate in the arrow direction shown in FIG. 31 (S7). Further, after ta seconds, as shown in FIG. 32, the projections and grooves of the end surface folding rollers 73 and 74 are fitted at the position of the end surface fold, and the end surface of the sheet is folded back.

  The operation at the moment of the end face folding described above is shown in FIGS. As shown in FIG. 35, one wall of the groove 74a in the other end face folding roller 74 is provided with an elastic body 74b, and immediately before the concave and convex portions of the end face folding rollers 73 and 74 are fitted at the position of the end face fold, The protrusion 73a of the one end face folding roller 73 nipped and rotated the sheet at the position of the crease by the elastic body 74b provided in the groove 74a of the other end face folding roller 74, and folded the end face of the sheet while squeezing the sheet. Then, as shown in FIG. 36, the tip end of the protrusion 73a in one end face folding roller 73 is fitted into the bottom end position of the groove 74a in the other end face folding roller 74, and the paper end face is folded back. At this time, one end surface folding roller 73 cuts off a part of the arc shape on the downstream side in the paper transport direction so that the folded end surface of the paper does not contact the outer peripheral surface of one end surface folding roller 73.

  Further, the groove 74a of the other end surface folding roller 74 has an opening edge 74d curved. Then, after the end face folding rollers 73 and 74 crease the end face of the sheet, the conveyance motor 110 and the end face folding motor 93 continue to rotate, and gradually enter the folding roller 75 from the end-folded end crease. As shown in FIG. 34, when the end face fold portion passes through the nip of the folding roller 75, the end face fold portion is completely folded back. At the same time, the paper folding controller 100 monitors whether or not the end face folding rollers 73 and 74 reach the standby position and the HP sensor 97 is turned on (S9). When the HP sensor 97 is turned on, the end face folding motor 93 is stopped (S10). The end face folding rollers 73 and 74 maintain the standby position. Thereafter, the transport motor 110 is stopped at the timing when the trailing edge of the sheet passes through the nip of the folding roller 75 (S11).

  As described above, according to the tenth embodiment, the end surface of the sheet is creased by the end surface folding rollers 73 and 74, and the end surface of the sheet that has been creased by the folding roller 75 is further folded. The paper is folded back so that the paper folds do not vary, and even if the paper is stiff, such as thick paper, the angle of the folds of the end face folds will not vary or bend and bend , It is difficult for things like paper jams to occur.

  Since the end face folding rollers 73 and 74 can be arbitrarily set with respect to the sheet conveyance direction, the angle of the end face folding can also be arbitrarily changed.

  When the end face folding is not performed, the end face folding rollers 73 and 74 can be avoided at positions where they do not interfere with the conveyance of the sheet. Therefore, the thickness of the sheet when folded can be reduced. Further, by avoiding the position where the conveyance is not hindered, when the end face folding is not performed, the paper does not come into contact with the end face folding rollers 73 and 74 and the paper jam hardly occurs. Also, by folding the end face while transporting the paper, the paper can be folded without reducing the copying speed.

  Since the end face of the paper is folded by the projection 73a formed on the one end face folding roller 73 and the groove 74a formed on the other end face folding roller 74, the end face fold can be folded with a simple configuration, and The end face can be folded regardless of the strength of the waist without any variation in folding accuracy.

  Since the elastic member 74b is provided in the groove 74a of the other end surface folding roller 74, the paper is less likely to be displaced due to friction of the elastic member 74b, so that the folding accuracy does not vary more regardless of the strength of the paper. End face folding becomes possible.

  Since the roller surface on the downstream side in the conveying direction of one end surface folding roller 73 is cut into a flat shape, when the end surface of the sheet is folded by the end surface folding rollers 73 and 74, the end surface portion of the bent sheet and the one end surface are bent. The folding roller 73 is unlikely to come into contact with the roller surface, and the creased sheet enters the folding roller 75 in a state of being bent or folded into a reverse “he” shape, and is unlikely to cause a folding failure.

  Since the opening edge 74d of the groove 74a has a curved surface in the other end surface folding roller 74, the protrusion 73a of the one end surface folding roller 73 can smoothly enter and exit from the groove, and the curl ridge around the creased area. Can be prevented, and the occurrence of paper jams during conveyance can be prevented.

  Next, an eleventh embodiment will be described with reference to the flowcharts of FIGS. The difference from the tenth embodiment is that in the tenth embodiment, when the end surface folding is performed by the concavo-convex portions (projections 73a, grooves 74a) of the end surface folding rollers 73 and 74, while the sheet is conveyed, the first embodiment is different. In the second embodiment, the end face folding operation is performed in a state where the sheet is stopped once.

  In the flowchart shown in FIG. 40, the operation up to S26 is the same as that up to S6 in the tenth embodiment shown in FIG. 39, and the position where the end face crease is formed and the position where the concave and convex portions of the end face folding rollers 73 and 74 are fitted. The transport motor 110 is operated and stopped for a time ts seconds until the two match (S27). Next, the sheet is stopped in a state where the position where the end face crease is made coincides with the position where the concave and convex portions of the end face folding rollers 73 and 74 are fitted. Thereafter, the end surface folding motor 93 starts to rotate, the end surface folding rollers 73 and 74 rotate in the direction of the arrow shown in FIG. 32, and the concavo-convex portions of the end surface folding rollers 73 and 74 are fitted at the position of the end surface fold, and the end surface is folded back. (S28, S29).

  During this time, the paper folding controller 100 monitors whether or not the end face folding rollers 73 and 74 reach the standby position and the HP sensor 97 is turned on (S30). When the HP sensor 97 is turned on, the end face folding motor 93 is stopped (S31). The end face folding rollers 73 and 74 maintain the standby position. At that time, since the transport motor 110 is stopped, the leading edge of the sheet does not move. However, when the trailing edge of the sheet remains on the copying machine main body 200 side as shown in FIG. The copier continues to convey to the first side, and the entrance guide plate 61 of the connecting portion 60 moves to move the slack of the sheet from the broken line position to the solid line position, thereby stopping the conveyance of the leading edge of the sheet. It is discharged from the apparatus main body 200 side.

  Next, when the end face folding rollers 73 and 74 return to the standby position, the transport motor 110 rotates to transport the paper, and gradually enters the folding roller 75 from the leading fold portion of the paper, as shown in FIG. When the end face fold portion passes through the nip of the folding roller 75, the end face fold is completely folded back. Thereafter, the conveyance motor 110 stops at the timing when the trailing edge of the sheet passes through the nip of the folding roller 75 (S32).

  As described above, in this embodiment, even when the paper is stopped and the end face is folded, even when toner is placed on the entire area of the paper and the friction coefficient of the paper surface is reduced as in color output, the paper surface is wrinkled or bent. There is no folding and paper jams are less likely to occur.

  Next, a twelfth embodiment will be described. In the twelfth embodiment, the two roller pairs 23 to 26 of the second bellows folding unit 4 shown in FIG. The second bellows folding section 4 has a configuration in which two roller pairs are arranged with a space therebetween, and the friction coefficient of the roller surfaces of the second folding rollers 23 and 25 provided in the upper stage in each roller pair is provided in the lower stage. The lower folding rollers 24 and 26 are set lower (upper: metal roller, lower: rubber roller). The sheet is folded in a bellows shape by reciprocating between the pair of left and right folding rollers 23 to 26.

  As described above, the friction coefficient of the roller surfaces of the second folding rollers 23 and 25 provided in the upper stage in each roller pair is set lower than that of the second folding rollers 24 and 26 provided in the lower stage. When the fold line D formed by the fold part 3 is gripped by the second fold roller, the upper surface side of the sheet P with the fold line D as a boundary contacts the second fold roller 25 on the upper left side. Without being pulled by the grip force of the roller 25, the second fold roller left pair 25, 26 is gripped with the crease D as the tip. Therefore, double folding can be minimized, and even large-size paper can be creased to a desired size with a small and simple device, and finished in a thin state after folding. Can do.

  The roller hardness of either roller pair constituting the second folding means is softer than the other roller hardness (upper: metal roller, lower: rubber roller). Since a large number of nips can be formed with a small amount of pressure, the roller load is reduced, the size of the roller drive device is reduced, the paper folding device is also reduced in size and cost, and the thickness after folding is finished to be thin. be able to.

  Next, a thirteenth embodiment will be described. In the present embodiment, with respect to the two roller pairs 23 to 26 of the second bellows folding section 4, the rollers constituting the second bellows folding section 4 are metal rollers, and all the (second folding rollers 23 to 26). ) The friction coefficient of the roller surface is set low. When the fold D formed by the first bellows fold portion 3 is added by the second fold roller of the second bellows fold portion 4, the upper surface side of the sheet P with the fold D as a boundary is connected to the second fold roller 25 on the upper left side. Although the second folding roller 25 on the left side of the upper stage is a metal roller and the friction coefficient of the surface thereof is set low, the fold line D is not pulled by the grip force of the second folding roller 25 on the left side of the upper stage. Are added to the second pair of left folding rollers 25 and 26 with the front end being the front end.

  The lower left second folding roller 26 constituting the second bellows folding section 4 is a metal roller, and the friction coefficient of the roller surface is set low. Therefore, the lower surface side of the sheet P with the fold line D as a boundary is not added to the second pair of left folding rollers 25 and 26 while being pulled by the grip force of the second folding roller 26 on the lower left, but from the pair of sheet conveying rollers 14. And the second folding roller right pair 23, 24 are added to the second folding roller left pair 25, 26 with the crease D as the tip.

  All the rollers 23 to 26 of the second folding roller pair are metal rollers, and the surface state of the rollers is set to be slippery when the sheet comes into contact with the rollers. Therefore, when the folds formed at the first bellows fold part 3 are gripped, when the upper surface side of the sheet bordering on the folds contacts the upper stage of the second folding roller, it is pulled by the grip force of the upper second folding roller 25. The second fold roller pair is inserted into the second fold roller pair without being bent. In addition, the lower left second folding roller 26 is also a metal roller, and the friction coefficient of the surface is set low. Therefore, the lower surface of the sheet with the fold line as a boundary is pulled by the grip force of the lower left second folding roller 26. However, instead of being caught by the second folding roller pair 25, 26, the fold line is made to be the leading edge by the conveying force from the pair of paper conveying rollers and the conveying force from the second pair of folding rollers 23, 24 on the opposite side. Since the formed loop is added to the second folding roller pair, it can be finished in a state without double folding, and even a large sheet can be reliably secured to a desired size by a small and simple device. Can be creased and finished in a thin state after folding.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. In the above-described embodiment, the sheet folding apparatus 1 is provided in the copier body 200 to crease the sheet after completion of image formation. However, the present invention is not limited to this, and the sheet folding apparatus 1 is used alone. You may do it.

1 is a side view schematically showing a copier according to a first embodiment. It is a side view which expands and shows the principal part of the paper folding apparatus shown in FIG. It is a figure which shows the conveyance operation of the paper in the bellows folding part which concerns on 1st Embodiment, and is a side view which shows the state in which a paper is conveyed to the 1st bellows part. It is a figure which shows the conveyance operation of the sheet | seat in the bellows folding part which concerns on 1st Embodiment, and is a side view which shows the state by which a crease is given to a sheet | seat with a folding roller pair. It is a figure which shows the conveyance operation | movement of the paper in the bellows folding part which concerns on 1st Embodiment, and is a side view which shows the state in which a paper is conveyed to the 2nd bellows part. It is a figure which shows the conveyance operation of the paper in the bellows folding part which concerns on 1st Embodiment, and is a side view which shows the state by which a paper is folded in a 2nd bellows part. It is a figure which shows the conveyance operation of the paper in the bellows folding part which concerns on 1st Embodiment, and is a side view which shows the state by which a paper is repeatedly folded in a 2nd bellows part. It is a figure which shows the conveyance operation of the paper in the bellows folding part which concerns on 1st Embodiment, and is a side view which shows the state in which the folded paper is conveyed to a cross folding part. It is a top view which shows the roller pair (1st folding roller pair) of the upstream of a 1st folding means. It is a top view which shows the roller pair (2nd folding roller pair) of the downstream of the 1st folding means. It is a control block diagram concerning a 1st embodiment. 6 is a flowchart illustrating a sheet transport operation according to the first embodiment. It is a top view of the 1st folding roller pair which concerns on 2nd Embodiment. It is a top view which shows the 2nd folding roller pair which concerns on 2nd Embodiment. 10 shows a flowchart of a sheet transport operation according to a second embodiment. It is a side view of the 1st folding roller pair which concerns on 3rd Embodiment. FIG. 17 is a plan view of the first folding roller pair shown in FIG. 16. It is a figure which shows the conveyance operation of the paper in the bellows folding part which concerns on 3rd Embodiment, and is a side view which shows the state by which a crease is attached | subjected to a paper in the 1st bellows folding part. It is a figure which shows the conveyance operation of the paper in the bellows folding part which concerns on 3rd Embodiment, and is a side view which shows the state by which a paper is folded in the 2nd bellows folding part. It is a figure which shows the conveyance operation of the sheet | seat in the bellows folding part which concerns on 3rd Embodiment, and is a side view which shows the state by which a sheet | seat is repeatedly folded in a 2nd bellows folding part. It is a side view which shows the 1st bellows folding part which concerns on 4th Embodiment. It is a side view which shows the state in which a sheet | seat is conveyed through the 1st bellows folding part which concerns on 4th Embodiment. It is a side view which shows the 1st bellows folding part which concerns on 5th Embodiment. It is a top view which shows the conveyance roller pair in the 1st bellows folding part which concerns on 6th Embodiment. It is a side view which shows the 1st bellows folding part which concerns on 7th Embodiment. It is a side view which shows the 1st bellows folding part which concerns on 8th Embodiment. It is a side view which shows the state in which a sheet | seat is conveyed through the 1st bellows folding part which concerns on 8th Embodiment. It is a side view which shows the 1st bellows folding part which concerns on 9th Embodiment. It is a side view which shows the state in which a sheet | seat is conveyed through the 1st bellows folding part which concerns on 9th Embodiment. It is a side view which shows roughly the copying machine concerning 10th Embodiment. It is the schematic which expands and shows the end surface folding part which concerns on 10th Embodiment. It is the schematic which shows the end surface folding operation | movement of the end surface folding part which concerns on 10th Embodiment, and is a figure which shows the state which gives a crease to a paper end surface. It is the schematic which shows the end surface folding operation | movement of the end surface folding part which concerns on 10th Embodiment, and is a figure which shows the state which conveys a paper to a folding roller. It is the schematic which shows the end surface folding operation | movement of the end surface folding part which concerns on 10th Embodiment, and is a figure which shows the state which has an end surface folding roller in a retracted position. It is a side view which expands and shows an end surface folding roller. It is a side view which expands and shows an end surface folding roller. It is a top view of the end face folding part concerning a 10th embodiment. FIG. 20 is a control block diagram of a paper transport operation according to tenth and eleventh embodiments. It is a flowchart which shows the paper conveyance operation | movement which concerns on 10th Embodiment. It is a flowchart which shows the paper conveyance operation | movement which concerns on 11th Embodiment.

Explanation of symbols

1 Paper folding device 2 Paper transport unit (paper transport means)
3 First bellows fold (first folding means)
4 Second bellows folding part (second folding means)
16, 17 One rotating roller (one rotating member)
18, 19 The other rotating roller (the other rotating member)
20, 21 Conveying rollers 23, 24 Second folding roller right pair 25, 26 Second folding roller left pair 70 End face folding portion (first folding means)
73 One end face folding roller (one rotating member)
74 The other end face folding roller (the other rotating member)
75 Folding roller (second folding means)

Claims (8)

In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means .
The first folding means includes a first rotating member pair and a second rotating member pair provided on the downstream side of the first rotating member pair in the sheet conveying direction, and the first rotating member pair and the second rotating member. Each member pair has one rotating member having a protrusion and the other rotating member having a groove,
When the sheet is creased, the sheet is conveyed between the first rotating member pair and the second rotating member pair, and the protrusion of one rotating member and the groove of the other rotating member are formed in the first rotating member pair. The protrusion of one rotating member and the groove of the other rotating member are fitted in the second rotating member pair to fit, and a mountain-shaped fold and a valley-shaped crease are formed,
When the sheet is not creased, the first rotating member pair and the second rotating member pair stop the rotation of each rotating member, and the gap between the first rotating member pair and the second rotating member pair. A paper folding device, which is used as a paper conveyance guide path. In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means.
The first folding means includes a first rotating member pair and a second rotating member pair provided on the downstream side of the first rotating member pair in the sheet conveying direction, and the first rotating member pair and the second rotating member. The member pair has one rotating member having a protrusion and the other rotating member having a groove, respectively, and transports the paper between the first rotating member pair and the second rotating member pair, In the rotating member pair, the protrusion of one rotating member and the groove of the other rotating member are fitted, and in the second rotating member pair, the protrusion of one rotating member and the groove of the other rotating member are fitted to the sheet. Add a crease with a mountain shape and a crease with a valley shape,
A sheet folding device, wherein a conveyance roller is provided between the first folding unit and the second folding unit, and the conveyance roller is divided into a plurality along the rotation axis direction. In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means.
The first folding means includes a first rotating member pair and a second rotating member pair provided on the downstream side of the first rotating member pair in the sheet conveying direction, and the first rotating member pair and the second rotating member. The member pair has one rotating member having a protrusion and the other cylindrical rotating member, respectively, and transports the sheet between the first rotating member pair and the second rotating member pair, In the rotating member pair, the protrusion of one rotating member bites into the other rotating member, and in the second rotating member pair, the protrusion of one rotating member bites into the other rotating member, so that the folds and valleys of the mountain shape are formed on the sheet. Crease the shape,
A sheet folding device, wherein a plurality of rollers are provided on a rotation shaft of one rotating member, and the rollers convey the sheet by rotating the rollers. In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means.
In the first folding means, the end face of the paper is creased, and in the second folding means, the end face of the paper creased by the first folding means is further folded ,
The first folding means includes one rotating member having a protrusion and the other rotating member having a groove, and the protrusion of the one rotating member and the groove of the other rotating member are fitted to each other so that a crease is formed on the end surface of the sheet. Attached,
A sheet folding apparatus, wherein a groove formed in the other rotating member has a substantially V-shaped cross section, and an elastic member is provided on one wall of the groove. In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means.
In the first folding means, the end face of the paper is creased, and in the second folding means, the end face of the paper creased by the first folding means is further folded,
The first folding means includes one rotating member having a protrusion and the other rotating member having a groove, and the protrusion of the one rotating member and the groove of the other rotating member are fitted to each other so that a crease is formed on the end surface of the sheet. Attached,
The sheet folding device, wherein the rotation angle of each of the rotation members of the one rotation member and the other rotation member is freely changeable with respect to the sheet conveyance direction. In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means.
In the first folding means, the end face of the paper is creased, and in the second folding means, the end face of the paper creased by the first folding means is further folded,
The first folding means includes one rotating member having a protrusion and the other rotating member having a groove, and the protrusion of the one rotating member and the groove of the other rotating member are fitted to each other so that a crease is formed on the end surface of the sheet. Attached,
One rotating member cuts off a part of the arc shape on the downstream side in the sheet conveying direction so that when the end face of the sheet is bent, the bent portion of the sheet does not contact one rotating member. A sheet folding apparatus characterized by the above. In a paper folding apparatus comprising: a paper transporting means for transporting a paper; a first folding means for folding the paper; and a second folding means for folding the paper that has been folded by the first folding means.
In the first folding means, the end face of the paper is creased, and in the second folding means, the end face of the paper creased by the first folding means is further folded,
The second folding means includes a pair of folding rollers that grips the fold formed by the first folding means and further folds the end surface of the paper, and reduces the surface friction of one and the other of the folding roller pair. A paper folding device characterized in that the paper caught by the pair of folding rollers is slippery. An image forming apparatus comprising the sheet folding apparatus according to any one of claims 1 to 7.

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