JP2013060246A - Paper folding apparatus and image forming apparatus - Google Patents

Paper folding apparatus and image forming apparatus Download PDF

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Publication number
JP2013060246A
JP2013060246A JP2011198758A JP2011198758A JP2013060246A JP 2013060246 A JP2013060246 A JP 2013060246A JP 2011198758 A JP2011198758 A JP 2011198758A JP 2011198758 A JP2011198758 A JP 2011198758A JP 2013060246 A JP2013060246 A JP 2013060246A
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Prior art keywords
sheet
paper
roller pair
additional folding
folding roller
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JP2011198758A
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Japanese (ja)
Inventor
Kenji Kai
健児 開
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Ricoh Co Ltd
株式会社リコー
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Abstract

PROBLEM TO BE SOLVED: To provide a paper holding apparatus and an image forming apparatus capable of forming an additional folded part on a continuous piece of paper over the entire range in the paper width direction by restraining the dispersion of pressurizing force while achieving downsizing and a low cost.SOLUTION: This paper holding apparatus includes a paper folding means, a first additional pair of folding rollers in which an additional fold is formed on a continuous piece of paper by a pair of roller members which has a smaller width in the axial direction than the maximum width of the paper and is provided at an end in the paper width direction on the more downstream side than the paper folding means, and a second additional pair of folding rollers in which an additional folded part is formed on the paper by a pair of roller members which has a smaller width in the axial direction than the maximum width of the paper and is provided at the other end in the paper width direction on the more downstream side than the first additional pair of folding rollers wherein a rotating shaft of each pair of roller members of the first additional pair of folding rollers or the second additional pair folding rollers is disposed in such a way that the outer end in the paper width direction of a rotating shaft with reference to the inner end is declined with respect to the direction perpendicular to a paper feeding direction at each prescribed angle to the downstream side or upstream side, and both inner ends in the paper width direction of the first additional pair of folding rollers and second additional pair of folding rollers are made to be very close to each other in the paper feeding direction.

Description

  The present invention relates to a sheet folding apparatus that performs folding processing on a sheet, and an image forming apparatus including the sheet folding apparatus.

  2. Description of the Related Art Conventionally, as a sheet folding device, a folding process for forming a crease is performed by sandwiching and conveying the bending of a sheet formed by stopping the leading end of a sheet being conveyed between a pair of folding rollers that are a pair of roller members. What to do is known. Further, the sheet on which the crease is formed is passed through a nip portion of an additional fold roller pair which is a pair of roller members provided on the downstream side in the sheet conveyance direction with respect to the fold roller pair, and the crease is pressed to perform additional fold. There is.

  However, if the axial width of the roller member of the pair of additional folding rollers has a width that can be increased and folded across the entire sheet width direction, the crease is simultaneously pressed over the entire sheet width direction. . Therefore, the applied pressure at the nip portion is dispersed in the paper width direction, and it is difficult to reduce the fold height.

  The paper folding device described in Patent Document 1 includes a plurality of pairs of additional folding rollers as described below using a plurality of roller members whose axial width is shorter than the maximum width of paper that can be used in the device. Yes. That is, a first additional folding roller pair that performs additional folding on the fold at the center of the sheet is provided. Further, a second additional folding roller pair is provided on the downstream side of the first additional folding roller pair in the paper transport direction to perform additional folding on the fold on the right side of the paper in the paper transport direction. Further, a third additional folding roller pair is provided on the downstream side of the first additional folding roller pair in the paper conveyance direction to perform additional folding on the left fold in the paper direction in the paper conveyance direction.

  The rotation axis of each roller of the first additional folding roller pair is arranged in a direction orthogonal to the paper transport direction. On the other hand, the rotation axis of each roller of the second additional folding roller pair and the third additional folding roller pair has a sheet outer end of the rotation axis with respect to a direction perpendicular to the sheet conveying direction with respect to the sheet inner end of the rotation axis. The portion is arranged to be inclined at a predetermined angle on the downstream side in the sheet conveying direction.

  The sheet in which the crease at the center of the sheet is increased and folded by the first additional folding roller pair is the inner side in the sheet width direction of the nip portion of each of the second additional folding roller pair and the third additional folding roller pair disposed at an inclination of the predetermined angle. While entering the end portion and being pressurized, it sequentially enters the outer end portion of the nip portion in the paper width direction and passes while being pressurized. Thereby, it is possible to suppress the pressure applied at the nip portion of the second additional folding roller pair or the third additional folding roller pair from being dispersed in the paper width direction, and to perform stronger additional folding.

  However, since three additional folding roller pairs are provided to perform additional folding on the paper throughout the paper width direction while suppressing the pressure applied at the nip portion from being dispersed in the paper width direction, the size of the apparatus can be increased. There arises a problem such as an increase in cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the size and cost of the apparatus while suppressing the pressure applied at the nip portion from being dispersed in the paper width direction. It is an object of the present invention to provide a sheet folding apparatus capable of performing additional folding on a sheet over the entire direction and an image forming apparatus including the sheet folding apparatus.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a sheet folding device for folding a sheet, and one end side in the sheet width direction on the downstream side of the sheet conveying direction with respect to the sheet folding unit. The first additional folding roller pair that is further folded on the paper with a pair of roller members that are shorter in the axial direction than the maximum width of the paper that can be used in the apparatus, and more than the first additional folding roller pair A second additional folding roller pair provided on the other end side in the paper width direction on the downstream side in the paper transport direction and configured to further fold the paper with a pair of roller members whose axial width is shorter than the maximum width of the paper; The rotation shafts of the roller members of the first additional folding roller pair and the second additional folding roller pair rotate relative to the direction perpendicular to the paper transport direction with respect to the inner end portion of the rotation axis in the paper width direction. The outer edge of the shaft in the paper width direction is the paper transport direction Are inclined a predetermined angle to the flow or upstream, said first additional folding roller pair and the second additional folding rollers each sheet width direction inside end portion is characterized in that the overlap in the sheet conveyance direction.

  In the present invention, the inner ends of the first additional folding roller pair and the second additional folding roller pair overlap each other in the sheet conveying direction, so the first additional folding roller pair and the second additional folding roller pair As a result, the central portion of the paper in the paper width direction is further folded. As a result, there is no need to provide a dedicated additional folding roller pair for additional folding of the central portion in the sheet width direction of the sheet, so that the apparatus can be reduced in size and cost accordingly. In addition, since the first additional folding roller pair and the second additional folding roller pair are disposed at a predetermined angle with respect to the orthogonal direction, each of the first additional folding roller pair and the second additional folding roller pair The sheet can be further folded from one end side to the other end side in the width direction of the sheet while suppressing the pressure applied at the nip portion from being dispersed in the sheet width direction.

  As described above, according to the present invention, the sheet can be further folded over the entire region in the sheet width direction while suppressing the pressure applied at the nip portion from being dispersed in the sheet width direction while reducing the size and cost of the apparatus. There is an excellent effect of being able to.

FIG. 3 is a schematic view of an additional folding roller pair and the periphery of the sheet folding device according to Configuration Example 1 as viewed from above. 1 is a schematic diagram of an image forming apparatus including an image forming apparatus main body and a sheet folding device according to an embodiment. 1 is a schematic configuration diagram of a sheet folding device according to an embodiment. The schematic diagram which looked at the additional folding roller pair and its periphery from the paper width direction. FIG. 10 is a schematic view of an additional folding roller pair and its periphery of a sheet folding device according to Configuration Example 2 as viewed from above. The schematic diagram which looked at the additional folding roller pair and its periphery from the paper width direction. FIG. 10 is a schematic view of an additional folding roller pair and its periphery of a sheet folding device according to Configuration Example 3 as viewed from above. FIG. 10 is a schematic view of an additional folding roller pair and its periphery of a sheet folding device according to Configuration Example 4 as viewed from above. FIG. 10 is a schematic diagram of an additional folding roller pair and its periphery of a sheet folding device according to Configuration Example 5 as viewed from above.

  Hereinafter, an embodiment in which the present invention is applied to a paper folding apparatus that performs folding processing on paper discharged from an image forming apparatus will be described.

  FIG. 2 shows an image forming apparatus comprising a sheet folding apparatus 200 according to the present embodiment and an image forming apparatus main body 100 such as a copying machine or a printer that supplies the sheet folding apparatus 200 with a sheet P as a sheet material after image formation. 2 is a schematic configuration diagram of an apparatus 300. FIG. The image forming apparatus 300 is not limited to the image forming apparatus 300 including the image forming apparatus main body 100 and the sheet folding apparatus 200, and includes an image forming unit that forms an image on the sheet P and a sheet processing unit that performs a folding process on the sheet P. The present invention can be applied to the sheet processing means of the image forming system.

  The image forming apparatus main body 100 of the present embodiment is an electrophotographic image forming apparatus including an image processing circuit, a photoconductor, an optical writing device, a developing device, a transfer device, and a fixing device, although not particularly illustrated. The image processing circuit converts image data read by a scanner unit when the image forming apparatus main body 100 is a copying machine or image data input from an external device such as a personal computer into printable image data, and the converted image Data is output to the optical writing device. The optical writing device performs optical writing on the photoconductor based on the image signal output from the image processing circuit to form an electrostatic latent image on the surface of the photoconductor. The developing device develops toner on the electrostatic latent image formed on the surface of the photoreceptor by optical writing. The transfer device transfers the toner image on the surface of the photoreceptor visualized by the developing device onto the paper P. The fixing device fixes the toner image transferred onto the paper P onto the paper P.

  The sheet P on which the toner image has been fixed by the image forming apparatus main body 100 is sent to the sheet folding apparatus 200 and is folded by the sheet folding apparatus 200. The image forming apparatus main body 100 of the present embodiment is of an electrophotographic system as described above, but all of the known image forming apparatuses such as an ink jet system and a thermal transfer system are used as the image forming apparatus main body 100 as a paper folding device 200. Can be combined.

  FIG. 3 is a schematic configuration diagram of the sheet folding device 200 according to the present embodiment. The sheet folding apparatus 200 receives a sheet on which an image is formed from an image forming apparatus main body (not shown) from a sheet entrance, and performs a predetermined sheet folding process. When post-processing such as punching or stapling is performed after the paper folding process, the folded paper is discharged to a post-processing apparatus (not shown). The sheets after folding are stacked.

  The sheet folding apparatus 200 has a first conveyance path 1, a second conveyance path 2, a third conveyance path 3, a fourth conveyance path 4, a fifth conveyance path 5, and a sixth conveyance as conveyance paths for conveying the sheet. A path 6, a seventh transport path 7, an eighth transport path 8, a ninth transport path 9, a tenth transport path 10, a paper storage unit discharge transport path 11, and a horizontal transport path 13. Each transport path is formed by arranging guide plates for guiding the transport of the paper with a predetermined gap distance on both sides in the thickness direction of the paper. Each conveyance path is arranged between the conveyance paths directly or with a pair of rollers composed of two folding rollers. Further, the first switching claw 31, the second switching claw 32, the third switching claw 33, the fourth switching claw 34, the fifth switching claw 35, and the sixth switching claw that guide the paper to each conveyance path so as to switch the conveyance path. 36 is provided. Further, in the transport paths of the second transport path 2, the third transport path 3, and the fourth transport path 4, a first stopper 51, a second stopper are used as stop members for stopping and abutting the leading edge of the transported paper. 52 and a third stopper 53 are provided. The first folding roller 21 and the second folding roller 22 are arranged so that the second folding roller 22 and the third folding roller 23 are in pressure contact with the fourth folding roller 24 and the fifth folding roller 25, respectively. Thus, a pair of folding rollers forming a first nip, a second nip, and a third nip is formed. As described above, the second folding roller 22 in one of the pair of folding rollers forming the first nip is configured to serve also as one folding roller of the pair of folding rollers forming the second nip. Thereby, the paper folding device 200 is simplified and downsized.

  With such a configuration, it is possible to perform the sheet folding processing operation in each folding mode (bi-folding, Z-folding, outer tri-folding, inner tri-folding, simple four-folding, and four-tone folding). Hereinafter, each folding processing operation will be described.

<Folded>
The paper received from the paper entrance is guided to the first transport path 1 by the first switching claw 31. And it guides to the 2nd conveyance path 2 so that the front-end | tip may contact | abut the 1st stopper 51 which can be moved to the folding position arrange | positioned in the 2nd conveyance path 2. FIG. Then, the bent portion of the sheet generated when the leading end abuts against the first stopper 51 enters the first nip between the first folding roller 21 and the second folding roller 22 to perform the first folding process. It will be in a state of being folded in half.

  The second folded roller 22 and the third folding roller 23 rotate the sixth switching claw 36, which will be described in detail later, and do not enter the third conveyance path 3 in the folded paper. Guided to enter the second nip to be formed. Then, it is transported so as to pass through the second nip, and is guided to the fifth transport path 5 by the second switching claw 32. Further, the paper passes through the seventh conveyance path 7 while being further folded by the additional folding roller mechanism 26, is guided to the eighth conveyance path 8 by the third switching claw 33, passes through the horizontal conveyance path 13, and is changed to the fifth switching claw. 35 is guided to the tenth transport path 10, and is discharged to the paper storage section 41 via the paper storage section discharge transport path 11. Further, when performing post-processing, the paper is passed through the seventh transport path 7 while being further folded by the additional folding roller mechanism 26, guided to the ninth transport path 9 by the third switching claw 33, and moved to the post-processing apparatus side. The paper is ejected.

<Z-fold>
The paper received from the paper entrance is guided to the first transport path 1 by the first switching claw 31. Then, the first nip formed by the first fold roller 21 and the second fold roller 22 is passed, and the tip can be moved to the fold position arranged in the third transport path 3 by the sixth switching claw 36. The third conveyance path 3 is guided so as to abut against the second stopper 52. Then, the bent portion of the sheet generated when the leading end abuts against the second stopper 52 enters the second nip formed by the second folding roller 22 and the third folding roller 23 to perform the first folding process.

  Subsequently, the sheet is guided to the fourth conveyance path 4 by the second switching claw 32 so that the leading edge of the sheet abuts against the third stopper 53 that can move to the folding position arranged in the fourth conveyance path 4. Then, the bent portion of the sheet caused by the front end abutting against the third stopper 53 enters the third nip formed by the fourth folding roller 24 and the fifth folding roller 25, and the second folding process is performed. As a result, the Z-fold state is established.

  The sheet in the Z-fold state is guided to the sixth transport path 6. Then, the paper is passed through the seventh conveyance path 7 while being further folded by the additional folding roller mechanism 26, guided to the eighth conveyance path 8 by the third switching claw 33, and then passed through the horizontal conveyance path 13 to the fifth switching claw. 35 is guided to the tenth transport path 10, and is discharged to the paper storage section 41 via the paper storage section discharge transport path 11. Further, when performing post-processing, after being guided to the sixth transport path 6, the paper is passed through the seventh transport path 7 while being further folded by the additional folding roller mechanism 26, and the ninth transport pawl 33 performs the ninth transport. It is guided to the path 9 and discharged to the post-processing apparatus side.

<Outer tri-fold, inner tri-fold, simple four-fold>
The paper received from the paper entrance is guided to the first transport path 1 by the first switching claw 31. And it guides to the 2nd conveyance path 2 so that the front-end | tip may contact | abut the 1st stopper 51 which can be moved to the folding position arrange | positioned in the 2nd conveyance path 2. FIG. Then, the bent portion of the sheet generated when the leading end abuts against the first stopper 51 enters the first nip formed by the first folding roller 21 and the second folding roller 22 to perform the first folding process.

  Subsequently, the sheet is guided to the third conveyance path 3 by the sixth switching claw 36 so that the leading edge of the sheet abuts against the second stopper 52 that can move to the folding position arranged in the third conveyance path 3. Then, the bent portion of the sheet caused by the front end abutting against the second stopper 52 enters the second nip formed by the second folding roller 22 and the third folding roller 23, and the second folding process is performed. This completes the folding process.

  The outer trifold, inner trifold, and simple four fold are almost the same as the folding operation and are as described above. The difference between the folding process of the outer trifold, inner trifold, and simple fourfold is the first folding position, and the folding position of the sheet can be adjusted by changing the position of the first stopper 51. Then, the subsequent second folding position is determined according to the first folding position on the paper, and each folding process is performed. Specifically, the first stopper 51 and the second stopper 52 are stopped at controlled positions according to the respective folding modes of outer tri-fold, inner tri-fold, and simple four-fold, and the paper size.

  The sheet for which the folding process has been completed is guided to the fifth transport path 5 by the second switching claw 32. Then, the paper is passed through the seventh conveyance path 7 while being further folded by the additional folding roller mechanism 26, guided to the eighth conveyance path 8 by the third switching claw 33, and then passed through the horizontal conveyance path 13 to the fifth switching claw. 35 is guided to the tenth transport path 10, and is discharged to the paper storage section 41 via the paper storage section discharge transport path 11. Further, when performing post-processing, the paper is passed through the seventh transport path 7 while being further folded by the additional folding roller mechanism 26, guided to the ninth transport path 9 by the third switching claw 33, and moved to the post-processing apparatus side. The paper is ejected.

<Kannon quadrifold>
The paper received from the paper entrance is guided to the first transport path 1 by the first switching claw 31. And it guides to the 2nd conveyance path 2 so that the front-end | tip may contact | abut the 1st stopper 51 which can be moved to the folding position arrange | positioned in the 2nd conveyance path 2. FIG. Then, the bent portion of the sheet generated when the leading end abuts against the first stopper 51 enters the first nip formed by the first folding roller 21 and the second folding roller 22 to perform the first folding process.

  Subsequently, the sheet is guided to the third conveyance path 3 by the sixth switching claw 36 so that the leading edge of the sheet abuts against the second stopper 52 that can move to the folding position arranged in the third conveyance path 3. Then, the bent portion of the sheet caused by the front end abutting against the second stopper 52 enters the second nip formed by the second folding roller 22 and the third folding roller 23, and the second folding process is performed.

  Subsequently, the sheet is guided to the fourth transport path 4 by the second switching claw 32 so that the front end of the sheet hits the third stopper 53 that can move to the folding position arranged in the fourth transport path 4. Then, the bent portion of the sheet caused by the front end hitting the third stopper 53 enters the third nip formed by the fourth folding roller 24 and the fifth folding roller 25, and the third folding process is performed. At the time of the third fold, the bent portion is pressed by a not-shown quadruple fold folding tip turning prevention mechanism provided in the fourth transport path 4. As a result, the leading and trailing edges of the paper folded in the first folding process and the second folding process can be pressed, and the third folding process is performed without turning up the paper edge. Now, it will be in the Kannon quadruple state.

  The sheet that has been folded into the Kannon quadruple state is guided to the fifth transport path 5 by the second switching claw 32. Then, the paper is passed through the seventh conveyance path 7 while being further folded by the additional folding roller mechanism 26, guided to the eighth conveyance path 8 by the third switching claw 33, and then passed through the horizontal conveyance path 13 to the fifth switching claw. 35 is guided to the tenth transport path 10, and is discharged to the paper storage section 41 via the paper storage section discharge transport path 11. Further, when performing post-processing, the paper is passed through the seventh transport path 7 while being further folded by the additional folding roller mechanism 26, guided to the ninth transport path 9 by the third switching claw 33, and moved to the post-processing apparatus side. The paper is ejected.

[Configuration example 1]
FIG. 1 is a schematic view of the additional folding roller pair 171 and 172 and the periphery of the sheet folding device 200 according to the present configuration example as viewed from above. FIG. 4 is a schematic view of the additional folding roller pair 171 and 172 and the periphery thereof as viewed from the paper width direction.

  The rotation shaft 71a of each roller of the additional folding roller pair 171 as a pair of roller members in which the roller 171a and the roller 171b are pressed against each other and the additional folding roller pair 172 as a pair of roller members in which the rollers 172a and 172b are in pressure contact with each other. , 71b, 72a, 72b are the sheet outer end portions of the rotation shafts 71a, 71b, 72a, 72b with respect to the sheet inner end portion of the rotation shafts 71a, 71b, 72a, 72b with respect to the direction orthogonal to the sheet conveying direction. Is inclined at a predetermined angle θ on the downstream side in the paper transport direction. Note that the predetermined angle θ of each rotating shaft has the same size, and the predetermined angle θ is preferably 0 [°] <θ ≦ 15 [°].

  The folded sheet P passes between the conveyance guide plate 173a and the conveyance guide plate 173b, enters the nip between the additional folding roller pair 171 and the additional folding roller pair 172, which are inclined, and is sandwiched and conveyed. The The folds of the paper are sandwiched and pressed at the inner end of the nip of each of the additional folding roller pair 171 and the additional folding roller pair 172 in the paper width direction, and are sequentially sandwiched toward the outer end of the nip in the paper width direction. Passed by being pressed. As a result, a concentrated load is sequentially applied to the folds of the sheet according to the nip positions of the additional folding roller pair 171 and the additional folding roller pair 172 that are inclined, and the folds are fixed.

  Further, an additional folding roller pair 171 is provided downstream of the additional folding roller pair 172 in the sheet conveying direction, and the additional folding roller pair 171 and the additional folding roller pair 172 intersect each other at the center in the sheet width direction. Thus, they are arranged so as to be shifted in the paper transport direction. Accordingly, the additional folding roller pair 171 and the additional folding roller pair 172 can perform additional folding at the center in the sheet width direction. Therefore, there is no need to provide a dedicated additional folding roller pair for additional folding in the central portion in the paper width direction, so that the apparatus can be reduced in size and cost accordingly.

  In addition, since the additional folding roller pair 171 and the additional folding roller pair 172 nip a range wider than the maximum sheet width, it is possible to fold and fold the sheet over the entire sheet width. At this time, since the additional folding roller pair 171 and the additional folding roller pair 172 are disposed at a predetermined angle θ with respect to the direction orthogonal to the sheet conveying direction, each of the additional folding roller pair 171 and the additional folding roller pair 172 is provided. The sheet P can be further folded from one end side to the other end side in the width direction of the sheet while suppressing the pressure applied at the nip portion from being dispersed in the sheet width direction.

  Further, as shown in FIG. 1, the additional folding roller pair 171 and the additional folding roller pair 172 are arranged at an angle of θ with respect to the direction orthogonal to the sheet conveying direction, so that the additional folding roller pair 171 and the additional folding roller pair 172 are additionally folded. When the sheet is conveyed by both the roller pair 172, the conveying force in the oblique direction toward the inner side in the sheet width direction with respect to the sheet conveying direction generated by each additional folding roller pair is offset. Therefore, the pair of additional folding rollers 171 and the pair of additional folding rollers 172 can convey the paper straight in the paper conveyance direction.

[Configuration example 2]
FIG. 5 is a schematic view of the additional folding roller pairs 171 and 172 and the periphery of the pair of folding rollers 200 according to this configuration example viewed from above. FIG. 6 is a schematic view of the additional folding roller pair 171 and 172 and the periphery thereof as viewed from the paper width direction.

  The rotation shaft 71a of each roller of the additional folding roller pair 171 as a pair of roller members in which the rollers 171a and 171b are pressed against each other and the additional folding roller pair 172 as a pair of roller members in which the rollers 172a and 172b are in pressure contact with each other. , 71b, 72a, 72b are the sheet outer end portions of the rotation shafts 71a, 71b, 72a, 72b with respect to the sheet inner end portion of the rotation shafts 71a, 71b, 72a, 72b with respect to the direction orthogonal to the sheet conveying direction. Is inclined at a predetermined angle θ upstream of the sheet conveyance direction. In addition, the predetermined angle θ of each rotating shaft is the same size.

  The folded sheet P passes between the conveyance guide plate 173a and the conveyance guide plate 173b, enters the nip between the additional folding roller pair 171 and the additional folding roller pair 172, which are inclined, and is sandwiched and conveyed. The The conveying directions at both ends of the sheet width direction at the leading edge of the sheet after passing through the nip of the additional folding roller pair 171 and the additional folding roller pair 172 are the rotation shafts 71a, 71b, 72a of the additional folding roller pair 171 and the additional folding roller pair 172, respectively. It is conveyed in a direction orthogonal to 72b. As a result, the conveyance force f for conveying the sheet P as shown in FIG. Since the conveying force f acts in a direction perpendicular to the rotation shafts 71a, 71b, 72a, 72b of the additional folding roller pair 171 and the additional folding roller pair 172, the direction f is inclined by a predetermined angle θ from the sheet conveying direction. It is suitable. Therefore, since the paper P is pulled outward in the paper width direction, it is possible to prevent the paper P from being bent in the paper width direction, which causes creases.

  Further, an additional folding roller pair 172 is provided downstream of the additional folding roller pair 171 in the sheet conveyance direction, and the additional folding roller pair 171 and the additional folding roller pair 172 intersect each other at the center in the sheet width direction. Thus, they are arranged so as to be shifted in the paper transport direction. Accordingly, the additional folding roller pair 171 and the additional folding roller pair 172 can perform additional folding at the center in the sheet width direction. Therefore, there is no need to provide a dedicated additional folding roller pair for additional folding in the central portion in the paper width direction, so that the apparatus can be reduced in size and cost accordingly.

  In addition, since the additional folding roller pair 171 and the additional folding roller pair 172 nip a range wider than the maximum sheet width, it is possible to fold and fold the sheet over the entire sheet width. At this time, since the additional folding roller pair 171 and the additional folding roller pair 172 are arranged to be inclined with respect to the direction orthogonal to the sheet conveying direction, the nip portions of the additional folding roller pair 171 and the additional folding roller pair 172 are respectively provided. The sheet P can be further folded from one end side to the other end side of the sheet in the width direction while suppressing the dispersion of the applied pressure in the sheet width direction.

  Here, the paper P is sandwiched between the respective nips and conveyed in the order of the additional folding roller pair 171 to the additional folding roller pair 172. For this reason, while the paper P is being transported by only one of the additional folding roller pair 171 and the additional folding roller pair 171, the transport force f is applied only to one side in the paper width direction. At this time, if the sheet contact surface which is the surface of the additional folding roller pair 171 or the additional folding roller pair 172 is formed of a high friction coefficient member, the conveying force f acts strongly on the sheet P, and the sheet P Is pulled in an oblique direction, the paper P is skewed.

  Therefore, in the present configuration example, the sheet contact surfaces of the additional folding roller pair 171 and the additional folding roller pair 172 are formed of a rubber material having a low friction coefficient or a metal having a small surface roughness, and transport that acts on the sheet P. By reducing the force f, the skew of the paper P is suppressed.

  In addition, as shown in FIG. 5, the additional folding roller pair 171 and the additional folding roller pair 172 are disposed at a predetermined angle θ with respect to the direction orthogonal to the sheet conveyance direction, so that the additional folding roller pair 171 and the additional folding roller pair 172 are further folded. When the paper is transported by both the roller pair 172, the transport force in the oblique direction toward the outside in the paper width direction with respect to the paper transport direction generated by each additional folding roller pair is offset. Therefore, the sheet can be conveyed straight in the sheet conveyance direction by the additional folding roller pair 171 and the additional folding roller pair 172 while pulling the sheet P outward in the sheet width direction.

[Configuration example 3]
FIG. 7 is a schematic view of the additional folding roller pair and the periphery thereof of the sheet folding device 200 according to this configuration example as viewed from above. The configuration of the additional folding roller pair 171 and the additional folding roller pair 172 in this configuration example is the same as that of the additional folding roller pair 171 and the additional folding roller pair 172 in the configuration example 2.

  Also in this configuration example, the rotation shaft 71a and the rotation shaft 72a of each of the additional folding roller pair 171 and the additional folding roller pair 172 have a rotation shaft 71a, a rotation shaft 72a, and the like with respect to a direction orthogonal to the sheet conveyance direction. With respect to the inner edge of the paper, the outer edge of the paper such as the rotary shaft 71a and the rotary shaft 72a is inclined at a predetermined angle θ on the upstream side in the paper conveyance direction. In addition, the predetermined angle θ of each rotating shaft is the same size.

  In the present configuration example, on the upstream side of the additional folding roller pair 171 and the additional folding roller pair 172 in the sheet conveyance direction, two conveyance rollers 174a attached to the rotation shaft 74 on one end side and the other end side in the sheet width direction, respectively. A conveying roller 174 having the following is arranged. Then, the conveyance roller 174 conveys the sheet creased by the folding mechanism toward the additional folding roller pair 171 and the additional folding roller pair 172. The rotation shaft 74 of the transport roller 174 is orthogonal to the paper transport direction and transports the paper P straight in the paper transport direction.

  As described above, the additional folding roller pair 171 and the additional folding roller pair 172 are inclined in the sheet conveying direction, and the conveying force f for conveying the sheet in an oblique direction is generated individually. However, when the sheet P is sandwiched and conveyed by both the additional folding roller pair 171 and the additional folding roller pair 172, the component force of the conveying force f in the sheet width direction is canceled. Therefore, the sheet P is conveyed straight in the sheet conveying direction. However, when the sheet P is sandwiched and conveyed by only one of the additional folding roller pair 171 and the additional folding roller pair 172, the conveyance force f acts on the sheet P only on one side, and the sheet P is inclined. Pulled in the direction and skew occurs.

  Therefore, in this configuration example, the conveying force F of the conveying roller 174 located upstream of the additional folding roller pair 171 in the sheet conveying direction is set to be stronger than the conveying force f of the additional folding roller pair 171. Thereby, the influence of the conveyance force f with respect to the paper P can be reduced, and it can suppress that the paper P is conveyed diagonally by the conveyance force f.

  As a method of controlling the conveying force f, adjustment is performed by adjusting the friction coefficient of the roller surface with respect to the sheet of the additional folding roller pair 171 and the additional folding roller pair 172, the nip pressure, and the like.

[Configuration Example 4]
FIG. 8 is a schematic view of the additional folding roller pair and the periphery thereof in the sheet folding apparatus 200 according to the present configuration example as viewed from above. The configuration of the additional folding roller pair 171 and the additional folding roller pair 172 in this configuration example is the same as that of the additional folding roller pair 171 and the additional folding roller pair 172 in the configuration example 2.

  Also in this configuration example, the rotation shaft 71a and the rotation shaft 72a of each of the additional folding roller pair 171 and the additional folding roller pair 172 have a rotation shaft 71a, a rotation shaft 72a, and the like with respect to a direction orthogonal to the sheet conveyance direction. With respect to the inner edge of the paper, the outer edge of the paper such as the rotary shaft 71a and the rotary shaft 72a is inclined at a predetermined angle θ on the upstream side in the paper conveyance direction. In addition, the predetermined angle θ of each rotating shaft is the same size.

  Further, an additional folding roller pair 172 is provided downstream of the additional folding roller pair 171 in the sheet conveying direction, and the additional folding roller pair 171 and the additional folding roller pair 172 intersect each other at the center in the sheet width direction. They are shifted in the paper transport direction.

  A transport roller 174 having two transport rollers 174a attached to the rotary shaft 74 at one end side and the other end side in the paper width direction is disposed upstream of the additional folding roller pair 171 in the paper transport direction. Then, the conveyance roller 174 conveys the sheet creased by the folding mechanism toward the additional folding roller pair 171 and the additional folding roller pair 172. The rotation shaft 74 of the transport roller 174 is orthogonal to the paper transport direction and transports the paper P straight in the paper transport direction.

  Further, on the downstream side of the additional folding roller pair 172 in the sheet conveyance direction, a conveyance roller 175 having two conveyance rollers 175a attached to the rotary shaft 75 on one end side and the other end side in the sheet width direction is disposed. . Then, the paper P that has been further folded by the pair of additional folding rollers 171 and the pair of additional folding rollers 172 is transported further downstream in the paper transport direction by the transport roller 175, and is fed to a post-processing device that performs origami stacker, stapling, and the like. Send it in. The rotation shaft 75 of the transport roller 175 is orthogonal to the paper transport direction and transports the paper P straight in the paper transport direction.

  The transport roller 174 and the transport roller 175 are arranged at a distance between the rotation axis centers of each other by a distance L in the paper transport direction. This distance L is the minimum paper length (folded paper) of the paper P in the paper transport direction. Shorter). Therefore, while the sheet P is nipped and conveyed by the additional folding roller pair 171 and the additional folding roller pair 172, the sheet P is nipped and conveyed by both or both of the conveying roller 174 and the conveying roller 175. It is in the state.

  Therefore, also in this configuration example, the conveying force F of the conveying roller 174 located upstream of the additional folding roller pair 171 in the sheet conveying direction is set stronger than the conveying force f of the additional folding roller pair 171 and the additional folding roller pair 172. Has been. Further, the conveying force F ′ of the conveying roller 174 located downstream of the additional folding roller pair 172 in the sheet conveying direction is set to be stronger than the conveying force f of the additional folding roller pair 171 and the additional folding roller pair 172. Thereby, when the paper P is transported by the transport roller 174 and the transport roller 175, the influence of the transport force f on the paper P is reduced, and the paper P is prevented from being transported obliquely by the transport force f. .

  Further, if the conveying force F and the conveying force F ′ are sufficiently strong with respect to the conveying force f, for example, set to 5 times, the additional folding roller pair 171 and the additional folding roller pair 172 are used as described in the configuration example 3. There is no need to take measures to offset the component force of the conveyance force f in the paper width direction.

[Configuration Example 5]
FIG. 9 is a schematic view of the additional folding roller pair and the periphery thereof in the sheet folding apparatus 200 according to the present configuration example as viewed from above.

  An additional folding roller pair 171 and an additional folding roller pair 172 are provided on the downstream side in the paper transport direction from the transport roller 176 that transports the paper creased by the folding mechanism. The rotation shaft 71a and the rotation shaft 72a of each roller of the additional folding roller pair 171 and the additional folding roller pair 172 have the inner end portions of the sheet such as the rotation shaft 71a and the rotation shaft 72a with respect to the direction orthogonal to the sheet conveyance direction. The paper outer ends such as the rotary shaft 71a and the rotary shaft 72a are inclined with respect to the upstream side in the paper transport direction by a predetermined angle θ as a reference. In addition, the predetermined angle θ of each rotating shaft is the same size.

  Further, the additional folding roller pair 172 is provided downstream of the additional folding roller pair 171 in the sheet conveyance direction so that the additional folding roller pair 171 and the additional folding roller pair 172 intersect each other at the center in the sheet width direction. Are shifted in the paper transport direction.

  An additional folding roller pair 171 ′ and an additional folding roller pair 172 ′ are provided downstream of the additional folding roller pair 171 and the additional folding roller pair 172 in the sheet conveying direction. The configuration of the additional folding roller pair 171 ′ and the additional folding roller pair 172 ′ is the same as the configuration of the additional folding roller pair 171 and the additional folding roller pair 172.

  The rotation shaft 71a ′ and the rotation shaft 72a ′ of each of the additional folding roller pair 171 ′ and the additional folding roller pair 172 ′ have a rotation shaft 71a ′, a rotation shaft 72a ′, and the like with respect to a direction orthogonal to the sheet conveying direction. The paper outer end such as the rotation shaft 71a ′ and the rotation shaft 72a ′ is inclined by a predetermined angle θ on the upstream side in the sheet conveyance direction with respect to the inner end of the sheet. In addition, the predetermined angle θ of each rotating shaft is the same size.

  Further, the additional folding roller pair 172 ′ is provided downstream of the additional folding roller pair 171 ′ in the sheet conveying direction, and the additional folding roller pair 171 ′ and the additional folding roller pair 172 ′ are provided at the center in the sheet width direction. They are arranged so as to be shifted in the paper transport direction so as to cross each other.

  An additional folding roller pair 171 ″ and an additional folding roller pair 172 ″ are provided downstream of the additional folding roller pair 171 ′ and the additional folding roller pair 172 ′ in the sheet conveying direction. The configuration of the additional folding roller pair 171 ″ and the additional folding roller pair 172 ″ is the same as the configuration of the additional folding roller pair 171 and the additional folding roller pair 172.

  The rotation shaft 71a ″ and the rotation shaft 72a ″ of each of the additional folding roller pair 171 ″ and the additional folding roller pair 172 ″ have a rotation shaft 71a ″ or the like with respect to a direction orthogonal to the sheet conveying direction. With respect to the inner end of the sheet such as the rotating shaft 72a ″, the outer end of the sheet such as the rotating shaft 71a ″ and the rotating shaft 72a ″ is inclined by a predetermined angle θ upstream in the sheet conveying direction. In addition, the predetermined angle θ of each rotating shaft is the same size.

  Further, the additional folding roller pair 172 ″ is provided on the downstream side of the additional folding roller pair 171 ″ in the sheet conveying direction, and the additional folding roller pair 171 ″ and the additional folding roller pair 172 ″ are formed in the sheet width. They are arranged so as to be shifted in the paper transport direction so as to cross each other at the center in the direction.

  In this configuration example, a plurality of additional folding roller mechanisms each including two pairs of additional folding rollers are provided side by side along the sheet conveyance direction, so that the sheet P is repeatedly repeatedly folded and more strongly increased. A desired fold can be obtained.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
In the paper folding apparatus, a paper folding means for performing folding processing on the paper, and provided at one end side in the paper width direction downstream of the paper folding means and in the paper width direction, the shaft is larger than the maximum width of the paper usable in the apparatus. A pair of additional folding rollers 171 that perform additional folding on the sheet with a pair of roller members having a short width in the direction, and a sheet width direction other than the first additional folding roller pair on the downstream side in the sheet conveying direction. A second additional folding roller pair, such as an additional folding roller pair 172, which is provided on the end side and is configured to perform additional folding on the paper with a pair of roller members that are shorter in the axial direction than the maximum width of the paper. The rotation axis of each roller member of the roller pair and the second additional folding roller pair is the outer end of the rotation axis in the sheet width direction with respect to the inner end of the rotation axis in the sheet width direction with respect to the direction orthogonal to the sheet conveyance direction. Is on the downstream side in the paper transport direction or It is inclined a predetermined angle to the flow side, the paper width direction inside end portion of each of the first additional folding roller pair and a second additional folding roller pair overlap in the sheet conveyance direction. According to this, as described in the above embodiment, the sheet can be further folded while suppressing the pressure applied at the nip portion from being dispersed in the sheet width direction while reducing the size and cost of the apparatus. it can.
(Aspect B)
In (Aspect A), the rotation axis of each roller member of the first additional folding roller pair and the second additional folding roller pair is based on the inner end of the rotation axis in the paper width direction with respect to the direction orthogonal to the paper transport direction. In addition, the outer end of the rotating shaft in the sheet width direction is disposed at a predetermined angle toward the upstream side in the sheet conveying direction. According to this, as described in the above embodiment, it is possible to suppress the bending of the paper.
(Aspect C)
In (Aspect A) or (Aspect B), the sheet contact surface of each roller member of the first additional folding roller pair and the second additional folding roller pair is formed of a low friction coefficient member. According to this, as described in the above embodiment, the skew of the paper can be suppressed.
(Aspect D)
In (Aspect A), (Aspect B), or (Aspect C), after the folding process is performed by the sheet folding means on the upstream side in the sheet conveying direction from the first additional folding roller pair or the second additional folding roller pair. A sheet conveying roller such as a conveying roller 174 that conveys the sheet toward the first additional folding roller pair and the second additional folding roller pair is provided, and the sheet conveying force of the sheet conveying roller is the first additional folding roller pair and the second additional folding roller pair. It is stronger than the sheet conveying force of the pair of additional folding rollers. According to this, as described in the above embodiment, the skew of the paper can be suppressed.
(Aspect E)
In (Aspect A), (Aspect B), or (Aspect C), an upstream side paper transport roller such as a transport roller 174 provided upstream of the first additional folding roller pair or the second additional folding roller pair in the paper transport direction. And a downstream paper transport roller such as a transport roller 175 provided downstream of the first additional folding roller pair and the second additional folding roller pair in the paper transport direction. The force and the sheet conveying force of the downstream sheet conveying roller are stronger than the sheet conveying force of the first additional folding roller pair and the second additional folding roller pair. According to this, as described in the above embodiment, the skew of the paper can be suppressed.
(Aspect F)
In (Aspect A), (Aspect B), (Aspect C), (Aspect D), or (Aspect E), the additional folding roller mechanism having the first additional folding roller pair and the second additional folding roller pair is moved in the sheet conveying direction. A plurality were provided. According to this, as described in the above embodiment, it is possible to obtain a desired crease that has been subjected to stronger extra folding.
(Aspect G)
(Aspect A), (Aspect B), (Aspect C), (Aspect D), (Aspect E) provided with an image forming apparatus main body that forms an image on a sheet, and an image forming apparatus main body that is integrated with or separate from the image forming apparatus main body Alternatively, the sheet folding device according to (Aspect F) is provided. According to this, as described in the above embodiment, the paper is further folded while suppressing the pressure applied at the nip portion from being dispersed in the paper width direction while reducing the size and cost of the apparatus. Can do.

DESCRIPTION OF SYMBOLS 1 1st conveyance path 2 2nd conveyance path 3 3rd conveyance path 4 4th conveyance path 5 5th conveyance path 6 6th conveyance path 7 7th conveyance path 8 8th conveyance path 9 9th conveyance path 10 10th conveyance path DESCRIPTION OF SYMBOLS 11 Paper storage part discharge conveyance path 13 Horizontal conveyance path 21 1st folding roller 22 2nd folding roller 23 3rd folding roller 24 4th folding roller 25 5th folding roller 26 Increase folding roller mechanism 31 1st switching claw 32 2nd Switching claw 33 Third switching claw 34 Fourth switching claw 35 Fifth switching claw 36 Sixth switching claw 41 Paper storage portion 51 First stopper 52 Second stopper 53 Third stopper 71a Rotating shaft 71b Rotating shaft 72a Rotating shaft 72b Rotating shaft 74 Rotating shaft 75 Rotating shaft 171 Additional folding roller pair 171a Roller 171b Roller 172 Additional folding roller pair 172a Roller 172b Roller 1 3a conveyance guide plate 173b conveying guide plate 174 transport rollers 174a transport roller 175 transport rollers 175a transport roller 176 transport rollers

JP 2010-195560 A

Claims (7)

  1. Paper folding means for performing folding processing on the paper;
    A pair of roller members, which are provided at one end side in the sheet width direction downstream of the sheet folding unit and in the sheet width direction, have a shorter width in the axial direction than the maximum sheet width that can be used in the apparatus, and further fold the sheet. A first additional folding roller pair;
    A pair of roller members provided on the other end side in the sheet width direction downstream of the first additional folding roller pair in the sheet conveyance direction and having a shorter width in the axial direction than the maximum width of the sheet are used to perform additional folding on the sheet. With two additional folding roller pairs,
    The rotation shafts of the roller members of the first additional folding roller pair and the second additional folding roller pair rotate relative to the direction perpendicular to the paper transport direction with respect to the inner end portion of the rotation axis in the paper width direction. The outer edge of the shaft in the paper width direction is inclined at a predetermined angle toward the downstream side or the upstream side in the paper conveyance direction,
    A sheet folding apparatus, wherein inner ends of the first additional folding roller pair and the second additional folding roller pair overlap in the sheet conveying direction.
  2. The paper folding apparatus according to claim 1.
    The rotation shaft of each roller member of the first additional folding roller pair and the second additional folding roller pair rotates with respect to a direction perpendicular to the paper transport direction with reference to the inner end of the rotation shaft in the paper width direction. A sheet folding device, wherein an outer end portion of the shaft in the sheet width direction is inclined at a predetermined angle toward the upstream side in the sheet conveying direction.
  3. The paper folding apparatus according to claim 1 or 2,
    A sheet folding apparatus, wherein a sheet contact surface of each roller member of the first additional folding roller pair and the second additional folding roller pair is formed of a low friction coefficient member.
  4. In the paper folding apparatus of Claim 1, 2, or 3,
    The sheet after the folding process is performed by the sheet folding unit on the upstream side in the sheet conveying direction from the first additional folding roller pair or the second additional folding roller pair is the first additional folding roller pair or the second second folding roller pair. A paper transport roller that transports toward the additional folding roller pair is provided,
    A sheet folding apparatus, wherein a sheet conveying force of the sheet conveying roller is stronger than a sheet conveying force of the first additional folding roller pair and the second additional folding roller pair.
  5. In the paper folding apparatus of Claim 1, 2, or 3,
    An upstream sheet conveying roller provided upstream of the first additional folding roller pair and the second additional folding roller pair in the sheet conveying direction;
    A downstream paper transport roller provided downstream of the first additional folding roller pair and the second additional folding roller pair in the paper transport direction;
    The sheet conveying force of the upstream sheet conveying roller and the sheet conveying force of the downstream sheet conveying roller are stronger than the sheet conveying force of the first additional folding roller pair or the second additional folding roller pair. Paper folding device.
  6. The paper folding apparatus according to claim 1, 2, 3, 4 or 5.
    A paper folding apparatus comprising a plurality of additional folding roller mechanisms having the first additional folding roller pair and the second additional folding roller pair along the paper transport direction.
  7. An image forming apparatus main body for forming an image on paper;
    An image forming apparatus comprising the sheet folding device according to claim 1, wherein the sheet folding device is provided integrally or separately from the image forming apparatus main body.
JP2011198758A 2011-09-12 2011-09-12 Paper folding apparatus and image forming apparatus Withdrawn JP2013060246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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JP2011198758A JP2013060246A (en) 2011-09-12 2011-09-12 Paper folding apparatus and image forming apparatus

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015120596A (en) * 2013-11-22 2015-07-02 株式会社リコー Sheet processing device, image formation system, sheet processing method
US9555998B2 (en) 2014-02-07 2017-01-31 Ricoh Company, Limited Sheet processing device, image forming system, and sheet processing method
US10105968B2 (en) 2014-05-13 2018-10-23 Ricoh Company, Ltd. Sheet processing device and image forming system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015120596A (en) * 2013-11-22 2015-07-02 株式会社リコー Sheet processing device, image formation system, sheet processing method
US9555998B2 (en) 2014-02-07 2017-01-31 Ricoh Company, Limited Sheet processing device, image forming system, and sheet processing method
US10105968B2 (en) 2014-05-13 2018-10-23 Ricoh Company, Ltd. Sheet processing device and image forming system
US10363757B2 (en) 2014-05-13 2019-07-30 Ricoh Company, Ltd. Sheet processing device and image forming system

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