Method for manufacturing a needleless binding

Abstract

Provided is a manufacturing method for a needleless binding portion that includes a first binding portion having a plurality of concavities and convexities and a second binding portion having a plurality of concavities and convexities that are disposed opposite the first binding portion and are fitted with the concavities and convexities of the first binding portion, and that binds media to each other by sandwiching the media in a thickness direction of the media with the first binding portion and the second binding portion. The manufacturing method includes a forming step of forming the binding portion using a mold; a first adjustment step of adjusting a center position of a convex portion of the binding portion that is formed using the mold and is removed from the mold; and a second adjustment step of adjusting an outer shape of the convex portion whose center position has been adjusted.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a needleless binding part for binding paper bundles, etc. without using binding needles. Background Technology

[0002] Regarding needleless binding parts (so-called needleless binders) for binding bundled papers without using binding needles, the technology described in the following patent documents 1-3 is a prior art.

[0003] Patent Document 1 (Japanese Patent Application Publication No. 2017-185785) discloses a binding unit 50 for binding paper by clamping it between interlocking upper teeth 540 and lower teeth 550. In Patent Document 1, the protrusions 541 and 551 of each tooth 540 and 550 are formed with a top surface 541a and 551a that is a plane along the surface of the paper, a sloped side surface 541b and 551b, a first side surface 542b and 552b extending along the thickness direction of the paper, and a bottom surface 542a and 552a along the surface of the paper. Furthermore, it is described that portions of the top surface 541a and 551a and the sloped side surface 541b and 551b are formed into convex curved surfaces. In addition, in Patent Document 1, all protrusions 541 and 551 are formed with the same shape.

[0004] Patent Document 2 (Japanese Patent Application Publication No. 2018-158796) describes a structure in which a binding unit 51, which uses an upper pressing member 83A and a lower pressing member 83B to clamp paper for binding, has a tooth shape comprising teeth consisting of five sharp protrusions 91 at the front end and teeth at the two ends consisting of trapezoidal protrusions 92 with their front ends cut off. Furthermore, Patent Document 2 also describes a structure in which a middle protrusion 95, with a protrusion less than the protrusions 91 but greater than the trapezoidal protrusions 92, is disposed between the protrusions 91 and 92.

[0005] Patent document 3 (Japanese Patent Application Publication No. 2018-158807) describes the following structure: In a binding unit 51 where paper is clamped and bound by an upper pressing member 83A and a lower pressing member 83B, the lower pressing member 83B has a tooth shape in which teeth composed of a high protrusion 42B with a sharp front end and a large protrusion are arranged at both ends of a low protrusion 42A with a sharp front end and a small protrusion.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2017-185785 (“0036”-“0043”, “0057”-“0062”) Figure 5 , Figure 6 (Figure 10)

[0007] Patent Literature 2: Japanese Patent Application Laid-Open No. 2018-158796 ("0025" to "0032", "0056" to "0063", Figure 4 , Figure 6 , FIG. 9)

[0008] Patent Literature 3: Japanese Patent Application Laid-Open No. 2018-158807 ("0034" to "0038", Figure 5 ) SUMMARY

[0009] The present application has an object to improve the binding force compared to a case where the center positions of the binding protrusions are uneven.

[0010] To achieve the object, the manufacturing method of the needleless binding portion according to the application of aspect 1 is a manufacturing method of a needleless binding portion that binds media to each other by sandwiching the media in a thickness direction of the media with a first binding portion having a plurality of concavities and convexities and a second binding portion disposed opposite to the first binding portion and having concavities and convexities that fit with the concavities and convexities of the first binding portion, the manufacturing method of the needleless binding portion performing:

[0011] a forming step of forming the binding portion with a mold;

[0012] a first adjustment step of adjusting a center position of a convex portion of the binding portion formed with the mold and taken out from the mold; and

[0013] a second adjustment step of adjusting an outer shape of the convex portion whose center position is adjusted.

[0014] The application of aspect 2 is the manufacturing method of the needleless binding portion according to aspect 1, which performs, after the forming step and before the first adjustment step, a step of pressing a portion of each of the binding portions on an opposite side to a certain portion of the concavities and convexities to warp the certain portion of the concavities and convexities.

[0015] The application of aspect 3 is the manufacturing method of the needleless binding portion according to aspect 2, which performs, after the warping step and before the first adjustment step, a step of processing so that the portion on the opposite side becomes flat.

[0016] The application of aspect 4 is the manufacturing method of the needleless binding portion according to any one of aspects 1 to 3, in which the convex portion has a first inclined surface and a second inclined surface located on a base end side more than the first inclined surface, and the first adjustment step of adjusting the center position of the convex portion is performed using a first mold that contacts the second inclined surface.

[0017] The invention described in the item 5 is the manufacturing method of the needleless binding portion described in the item 4, wherein the first mold also contacts the first inclined surface on the tip side of the convex portion.

[0018] The invention described in the item 6 is the manufacturing method of the needleless binding portion described in the item 5, wherein the second adjustment process of adjusting the outer shape of the tip of the convex portion using the second mold contacting the first inclined surface on the tip side of the convex portion is performed.

[0019] The invention described in the item 7 is the manufacturing method of the needleless binding portion described in any one of the items 4 to 6, wherein the outer surface of the second inclined surface on the base end side is more steeply inclined than the outer surface of the first inclined surface of the convex portion.

[0020] The invention described in the item 8 is the manufacturing method of the needleless binding portion described in any one of the items 4 to 7, wherein the position of the tip of the convex portion is the center position.

[0021] The invention described in the item 9 is the manufacturing method of the needleless binding portion described in any one of the items 1 to 8, wherein the convex portion has a first inclined surface and a second inclined surface on the base end side than the first inclined surface, and the second adjustment process of adjusting the outer shape of the convex portion using the second mold not contacting the second inclined surface is performed.

[0022] The invention described in the item 10 is the manufacturing method of the needleless binding portion described in any one of the items 1 to 9, wherein in the first adjustment process and the second adjustment process, the mold for adjustment does not contact the tip of the convex portion.

[0023] Effects of the Invention

[0024] According to the item 1 of the present invention, the binding force can be improved compared to the case where the center position of the binding convex portion is uneven.

[0025] According to the item 2 of the present invention, even if the binding portion is deformed when it is formed, the deformation can be corrected by the warping process.

[0026] According to the item 3 of the present invention, the adjustment in each adjustment process can be made easier compared to the case where the adjustment is not made flatly.

[0027] According to the item 4 of the present invention, the center position can be adjusted with high precision compared to the case where a mold contacting only the tip or the base end of the convex portion is used.

[0028] According to the item 5 of the present invention, the center position of the convex portion can be adjusted with high precision compared to the case where the mold does not contact the first inclined surface.

[0029] According to the sixth aspect of the present invention, compared with the case where the mold in contact with the first inclined surface is not used in the second adjustment step, the position of the front end side of the protruding part can be adjusted with high precision.

[0030] According to the seventh aspect of the present invention, the portion of the first inclined surface that is first subjected to force during binding can be adjusted with high precision.

[0031] According to the eighth aspect of the present invention, the position of the front end of the protruding part that first contacts the media during binding can be adjusted with high precision.

[0032] According to the ninth aspect of the present invention, compared with the case of contact with the second inclined surface in the second adjustment process, the shape of the part under force during binding, namely the first inclined surface, can be adjusted with high precision.

[0033] According to the tenth aspect of the present invention, compared with the case where the mold used in the first adjustment step or the second adjustment step contacts the front end of the protruding portion, deformation such as flattening of the front end due to the pressure generated by the adjustment can be suppressed. Attached Figure Description

[0034] The embodiments of the present invention will be described in detail with reference to the following figures.

[0035] Figure 1 This is an explanatory diagram of the image forming apparatus of Embodiment 1;

[0036] Figure 2 This is an overall illustration of the needleless binding section of Example 1;

[0037] Figure 3 AB is an explanatory diagram of the teeth portion of the needleless binding part in Example 1. Figure 3 A is the overall explanatory diagram. Figure 3 B is an enlarged view of the convex part;

[0038] Figure 4 AF is an explanatory diagram of the manufacturing method of the binding component in Example 1. Figure 4 A is an explanatory diagram of the forming process. Figure 4 B is an illustration of the warping process. Figure 4 C is an illustration of the cutting process. Figure 4 D is an explanatory diagram for the first adjustment process. Figure 4 E is an explanatory diagram for the second adjustment process. Figure 4 F is an explanatory diagram of the meshing process;

[0039] Figure 5 AB is an enlarged view of the main parts of the first adjustment step in Example 1. Figure 5 A is a diagram illustrating the state before adjustment. Figure 5 B is an illustration of the adjusted state;

[0040] Figure 6 is a main part enlarged view of the second adjustment process of Example 1;

[0041] Figure 7 A-B of is an explanatory view of a state in which a paper bundle is bound with a conventional structure, Figure 7 A of is an explanatory view of a state in which a front end of a protrusion of a central portion of a needleless binding portion contacts a surface of a paper bundle, Figure 7 B of is an explanatory view of a state in which a binding member is pressed from Figure 7 A of is an explanatory view of a state in which a binding member is pressed from

[0042] Figure 8 A-C of is an explanatory view of a state in which a paper bundle is bound with the structure of Example 1, Figure 8 A of is an explanatory view of a state in which a front end of a protrusion of a central portion of a needleless binding portion contacts a surface of a paper bundle, Figure 8 B of is an explanatory view of a state in which a binding member is pressed from Figure 8 A of is an explanatory view of a state in which a binding member is pressed from Figure 8 C of is an explanatory view of a state in which a binding member is pressed from Figure 8 A of is an explanatory view of a state in which a binding member is pressed from

[0043] Symbol explanation

[0044] 1 - first binding portion, 2 - second binding portion, 12, 22 - protruding portion, 12b, 22b - front end portion, 12c, 22c - base end portion, 41 - center position, 42 - first mold, 51 - second mold, S - medium, U3b - needleless binding portion. DETAILED DESCRIPTION

[0045] Next, an example as a specific example of an embodiment of the present application will be described with reference to the drawings, but the present application is not limited to the following example.

[0046] Further, in order to facilitate understanding of the following description, in the drawings, the front-rear direction is set as the X-axis direction, the left-right direction is set as the Y-axis direction, the up-down direction is set as the Z-axis direction, and the directions indicated by the arrows X, -X, Y, -Y, Z, -Z or the sides indicated thereby are respectively set as the front, the rear, the right, the left, the upper, the lower or the front side, the rear side, the right side, the left side, the upper side, the lower side.

[0047] Further, in the drawings, a mark in which "·" is written in "O" indicates an arrow that faces the front surface from the back surface of the paper, and a mark in which "X" is written in "O" indicates an arrow that faces the back surface from the front surface of the paper.

[0048] Further, in the description using the following drawings, in order to facilitate understanding, the drawings other than the components required for the description are appropriately omitted.

[0049] [Example 1]

[0050] (Explanation of the overall structure of the printer U of Example 1)

[0051] Figure 1 is an explanatory diagram of the image forming apparatus of Example 1.

[0052] In Figure 1 , the printer U, which is an example of the image forming apparatus of Example 1 of the present application, has a main body of the printer Ul, a feeding unit U2, which is an example of a supply device that supplies a medium to the main body of the printer Ul, an operation section Ul operated by a user, and a postprocessor U3, which is an example of a post-processing device that performs post-processing of a medium discharged from the main body of the printer Ul.

[0053] (Explanation of the structure of the marking device of Example 1)

[0054] In Figure 1 , the main body of the printer Ul has a control section (an example of a control unit) C that performs control of the printer U, an unillustrated communication section that receives image information transmitted from a print image server COM, which is an example of a transmission device that connects to the outside of the printer U via an unillustrated dedicated cable, a marking section Ula, which is an example of a recording unit that records an image on a medium, and the like. The print image server COM has connected thereto a personal computer PC, which is an example of a transmission device of an image that connects via a cable or a LAN: Local Area Network (LAN) or the like and that transmits information of an image printed by the printer U.

[0055] The marking section Ula, which is an example of an image holding unit, has photosensitive bodies Py, Pm, Pc, and Pk of each color of Y: yellow, M: magenta, C: cyan, and K: black, and a photosensitive body Po used to make an image more glossy when a print photograph image or the like is printed. The surfaces of the photosensitive bodies Py to Po are composed of a dielectric body having photosensitivity.

[0056] In Figure 1 , around the photosensitive body Pk of black color, there are arranged a charger CCK, which is an example of a charging unit, an exposure machine ROSk, which is an example of a latent image forming unit, a developer Gk, which is an example of a developing unit, a primary transfer roller Tlk, which is an example of a primary transfer unit, and a photosensitive body cleaning device CLk, which is an example of a cleaning unit for the image holding unit.

[0057] Likewise, around the other photosensitive bodies Py, Pm, Pc, Po, there are arranged the chargers CCy, CCm, CCc, CCo, the exposure devices ROSy, ROSm, ROSc, ROSo, the developers Gy, Gm, Gc, Go, the primary transfer rollers T1y, T1m, T1c, T1o, the photosensitive body cleaning devices CLy, CLm, CLc, CLo.

[0058] On the upper portion of the mark portion U1a, detachably supported is a toner cartridge Ky, Km, Kc, Ko, which is an example of a developer housing unit. The toner cartridges Ky to Ko house toner to be replenished to the developers Gy to Go.

[0059] Under each of the photosensitive bodies Py to Po, there is arranged an intermediate transfer belt B, which is an example of an intermediate transfer unit and an example of an image holding unit. The intermediate transfer belt B is sandwiched between the photosensitive bodies Py to Po and the primary transfer rollers T1y to T1o. The back surface of the intermediate transfer belt B is supported by a drive roller Rd, which is an example of a driving unit, a tension roller Rt, which is an example of a tension applying unit, a wobble preventing roller Rw, which is an example of a wobble preventing unit, a plurality of idler rollers Rf, which are an example of a driven unit, a support roller T2a, which is an example of a secondary transfer opposing unit, a plurality of retraction rollers R1, which are an example of a moving unit, and the primary transfer rollers T1y to T1o.

[0060] On the surface of the intermediate transfer belt B, in the vicinity of the drive roller Rd, there is arranged a belt cleaning device CLB, which is an example of a cleaning unit of the intermediate transfer unit.

[0061] On the support roller T2a, there is arranged a secondary transfer roller T2b, which is an example of a secondary transfer member, in opposition to the intermediate transfer belt B. Further, in order to apply a voltage of a polarity opposite to the polarity of the charge of the developer to the support roller T2a, a contact roller T2c, which is an example of a contact unit, is in contact with the support roller T2a.

[0062] The support roller T2a, the secondary transfer roller T2b, and the contact roller T2c constitute a secondary transfer device T2, which is an example of a secondary transfer unit of Embodiment 1. The primary transfer rollers T1y to T1o, the intermediate transfer belt B, the secondary transfer device T2, and the like constitute a transfer device T1, B, T2, which is an example of a transfer unit of Embodiment 1.

[0063] As an example of the housing unit, a paper feed tray TR1 is provided below the secondary transfer device T2. On the paper feed tray TR1, recording paper S, which is an example of the medium, is housed. A pick-up roller Rp, which is an example of the take-out unit, and a combing roller Rs, which is an example of the combing unit, are disposed in the right oblique upper side of the paper feed tray TR1. A conveyance passage SH that conveys the recording paper S extends from the combing roller Rs. A plurality of conveyance rollers Ra, which are an example of the conveyance unit that conveys the recording paper S to the downstream side along the conveyance passage SH, are disposed.

[0064] A burr removing device Bt, which is an example of the removal unit of the unnecessary portion, is disposed in the downstream side of the combing roller Rs. The burr removing device Bt grips the recording paper S with a predetermined pressure to convey it to the downstream side to perform removal of the unnecessary portion of the edge of the recording paper S (so-called burr removal).

[0065] A superimposed conveyance detection device Jk is disposed in the downstream side of the burr removing device Bt. The superimposed conveyance detection device Jk measures the thickness of the recording paper S that passes through to detect the state in which a plurality of recording papers S are superimposed (so-called superimposed conveyance).

[0066] A correction roller Rc, which is an example of the posture correction unit, is disposed in the downstream side of the superimposed conveyance detection device Jk. The correction roller Rc corrects the inclination (so-called skew) with respect to the conveyance direction of the recording paper S.

[0067] A positioning roller Rr, which is an example of the adjustment unit that adjusts the conveyance timing of the recording paper S to the secondary transfer device T2, is disposed in the downstream side of the correction roller Rc. Further, a sheet guide SG1, which is an example of the medium guide unit, is disposed in the downstream side of the positioning roller Rr.

[0068] In addition, on the feed unit U2, a paper feed tray TR2, TR3, and the like, which are configured in the same manner as the paper feed tray TR1 and the pick-up roller Rp, the combing roller Rs, and the conveyance roller Ra, are also provided, and the conveyance passages SH from the paper feed trays TR2, TR3 merge with the conveyance passage SH of the main body Ul of the printer on the upstream side of the superimposed conveyance detection device Jk.

[0069] A plurality of conveyance belts HB, which are an example of the conveyance unit of the medium, are disposed in the downstream side in the conveyance direction of the recording paper S with respect to the secondary transfer roller T2b.

[0070] A fixing device F, which is an example of the fixing unit, is disposed in the downstream side in the conveyance direction of the recording paper S with respect to the conveyance belt HB.

[0071] A collection tray U3a, which is an example of the paper carrying unit, is disposed in a postprocessor U3 in the downstream side of the fixing device F. A stapler U3b, which is an example of the stapling portion and an example of the stapling device, is disposed on the collection tray U3a.

[0072] A paper stacking tray U3c as an example of a second paper carrying unit is arranged on the outer side of the collection tray U3a.

[0073] A reversing passage SH2 as an example of a passage branched from the conveying passage SH is formed on the downstream side of the fixing device F. A first gate GT1 as an example of a switching unit in the conveying direction is arranged at the branching portion of the conveying passage SH and the reversing passage SH2.

[0074] A plurality of turn-back rollers Rb as an example of a conveying unit that can rotate in the forward and reverse directions is arranged in the reversing passage SH2. A connecting passage SH3 as an example of a conveying passage branched from the upstream portion of the reversing passage SH2 and merged with the conveying passage SH at a position further downstream than the branching portion of the conveying passage SH and the reversing passage SH2 is formed on the upstream side of the turn-back rollers Rb. A second gate GT2 as an example of a switching unit in the conveying direction is arranged at the branching portion of the reversing passage SH2 and the connecting passage SH3.

[0075] On the downstream side of the reversing passage SH2, a turn-back passage SH4 for reversing the conveying direction of the recording paper S (so-called turn-back) is arranged below the fixing device F. A turn-back roller Rb as an example of a conveying unit that can rotate in the forward and reverse directions is arranged in the turn-back passage SH4. Further, a third gate GT3 as an example of a switching unit in the conveying direction is arranged at the entrance of the turn-back passage SH4.

[0076] In addition, the conveying passage SH on the downstream side of the turn-back passage SH4 merges with the conveying passage SH of the paper feed tray TR1.

[0077] (Action of the marking device)

[0078] In the printer U, when image information transmitted from a personal computer PC is received via a print image server COM, an image forming operation, i.e., a job, is started. When the job is started, the photosensitive bodies Py to Po and the intermediate transfer belt B rotate.

[0079] The photosensitive bodies Py to Po are rotationally driven by a drive source not shown.

[0080] The chargers CCy to CCo are applied with a voltage set in advance to charge the surfaces of the photosensitive bodies Py to Po.

[0081] The exposure devices ROSy to ROSo output laser beams Ly, Lm, Lc, Lk, and Lo as an example of light for writing latent images in accordance with a control signal from the control section C to write electrostatic latent images to the charged surfaces of the photosensitive bodies Py to Po.

[0082] The developers Gy to Go develop the electrostatic latent images on the surfaces of the photosensitive bodies Py to Po into visible images.

[0083] Tone cartridge Ky ~ Ko replenishes the developer consumed with development in the developer container Gy ~ Go.

[0084] Primary transfer rollers T1y ~ T1o apply a primary transfer voltage of a polarity opposite to the charged polarity of the developer to transfer the visible image on the surface of the photoreceptors Py ~ Po to the surface of the intermediate transfer belt B.

[0085] A photoreceptor cleaning device CLy ~ CLo removes and cleans the developer remaining on the surface of the photoreceptors Py ~ Po after primary transfer.

[0086] The intermediate transfer belt B transfers and laminates the images in the order of O, Y, M, C, and K when passing through the primary transfer area opposite to the photoreceptors Py ~ Po, and passes through the secondary transfer area Q4 opposite to the secondary transfer device T2. In the case of a single-color image, only one color of image is transferred and conveyed to the secondary transfer area Q4.

[0087] A pick-up roller Rp feeds the recording paper S from the paper feed trays TR1 ~ TR3 that perform the supply of the recording paper S, according to the size and designation of the received image information, and the size and type of the housed recording paper S, and the like.

[0088] A combing roller Rs separates and combs the recording paper S fed from the pick-up roller Rp one by one.

[0089] A burr removing device Bt applies a predetermined pressure to the passing recording paper S to remove burrs.

[0090] An overlap conveyance detecting device Jk detects the overlap conveyance of the recording paper S by detecting the thickness of the passing recording paper S.

[0091] A correction roller Rc contacts the passing recording paper S to a non-illustrated wall surface to correct skew.

[0092] A positioning roller Rr feeds the recording paper S corresponding to the timing at which the image on the surface of the intermediate transfer belt B is conveyed to the secondary transfer area Q4.

[0093] A paper guide SG1 guides the recording paper S fed by the positioning roller Rr to the secondary transfer area Q4.

[0094] In the secondary transfer device T2, a secondary transfer voltage of the same polarity as the pre-set charged polarity of the developer is applied to the support roller T2a via a contact roller T2c to transfer the image on the intermediate transfer belt B to the recording paper S.

[0095] A belt cleaning device CLB removes and cleans the developer remaining on the surface of the intermediate transfer belt B after the image is transferred in the secondary transfer area Q4.

[0096] The conveyer belt HB holds the recording paper S on which the image is transferred by the secondary transfer T2 on the surface and conveys it to the downstream side.

[0097] The fixing device F has a heating roller Fh as an example of a heating unit and a pressure roller Fp as an example of a pressure unit. Inside the heating roller Fh is housed a heater h as an example of a heat source. The fixing device F heats the recording paper S while pressing it against the fixing area Q5 where the heating roller Fh and the pressure roller Fp are in contact, and fixes the unfixed image on the surface of the recording paper S. The fixing unit Fp, Fh of Example 1 is composed of the heating roller Fh and the pressure roller Fp.

[0098] The recording paper S after passing through the fixing device F is conveyed to the reverse passage SH2 when double-sided printing is performed, and the first gate GT1 is opened. The recording paper S conveyed to the reverse passage SH2 is reversed (so-called turnaround) in the conveyance direction in the turnaround passage SH4. The recording paper S after the turnaround is conveyed again to the registration roller Rr through the conveyance passage SH, and is subjected to the second printing.

[0099] The recording paper S discharged to the stack tray U3c is conveyed in the conveyance passage SH and discharged to the stack tray U3c via the collection tray U3a in the case where it is discharged with the surface on which the image is recorded as the upper surface (so-called upward discharge case).

[0100] On the other hand, in the case where it is discharged with the surface on which the image is recorded as the lower surface (so-called downward discharge case), it is temporarily conveyed from the conveyance passage SH to the reverse passage SH2. Then, after the trailing end of the recording paper S passes through the second gate GT2, the forward rotation of the turnaround roller Rb is stopped. Then, the second gate GT2 is switched, and the turnaround roller Rb is reversely rotated to convey the recording paper S to the connecting passage SH3 to be conveyed to the stack tray U3c.

[0101] In the case where the bundle of recording papers S is stapled, the recording papers S are stacked on the collection tray U3a and stapled by a stapler U3b after being integrated by an unillustrated integration unit. The stapled bundle of recording papers S is discharged to the stack tray U3c.

[0102] (Explanation of the needleless stapler)

[0103] Figure 2 is a whole explanatory view of the needleless stapling portion of Example 1.

[0104] In Figure 2In this embodiment, the stapler U3b consists of a stapler section that performs staples without using staples (a so-called needleless stapler). The needleless stapler U3b has an upper stapler 1 as an example of a first stapler section and a lower stapler 2 as an example of a second stapler section. The upper stapler 1 and the lower stapler 2 are supported by a drive device including a motor and gears (not shown) so that they can move in directions that bring them closer together and separate from each other.

[0105] Figure 3 AB is an explanatory diagram of the teeth portion of the needleless binding part in Example 1. Figure 3 A is the overall explanatory diagram. Figure 3 B is an enlarged view of the convex part.

[0106] exist Figure 2 , Figure 3 In AB, an upper toothed portion 11 is formed on the lower surface of the upper binding member 1. The upper toothed portion 11 has a plurality of protrusions 12, which are arranged side by side along the arrangement direction 13. Therefore, the upper toothed portion 11 has a structure with a plurality of protrusions and concavities.

[0107] exist Figure 3 In embodiment AB, the top surface 12a of the front end portion of the protrusion 12 in embodiment 1 is formed as a curved surface. Both ends of the top surface 12a are connected to a front end slope 12b, which is an example of a first slope and a front end portion. The root side of the front end slope 12b is connected to a base end slope 12c, which is an example of a second slope and a base end portion. A bottom surface 12d extending parallel to the arrangement direction 13 is disposed on the root side of the base end slope 12c. In embodiment 1, the angle θ1 formed by the front end slope 12b and the direction (gravity direction) in which they approach and separate from each other is a smaller angle than the angle θ2 formed by the base end slope 12c and the gravity direction. That is, the base end slope 12c is formed as a steeper inclined surface than the front end slope 12b.

[0108] As an example, in this embodiment, θ1 = 35° and θ2 = 27° are set. Furthermore, ten teeth (protrusions 12) are arranged side-by-side along the arrangement direction 13.

[0109] exist Figure 3In embodiment AB, in the upper toothed portion 11 of embodiment 1, the protrusion 12 (12A) of the central tooth in the arrangement direction 13 of the plurality of protrusions 12 in this embodiment, i.e., the two central teeth, protrusions 12 (12B) that are disposed at a different position from the central portion protrusions protruding further to the front end. Specifically, each protrusion 12 in embodiment 1 is formed to be the same size, but in the base end portion of each protrusion 12, the central protrusion 12 (12A) in the arrangement direction 13 protrudes further to the front end side than the protrusions 12 (12B) at both ends in the arrangement direction 13. In other words, among the plurality of protrusions 12, the central protrusion 12A, the end protrusions 12B, and the protrusion 12C in the middle portion between the central portion and the end protrusions in the arrangement direction 13 have different protrusion amounts, and the plurality of protrusions 12 protrude further in the convex direction from the end portion toward the central portion in the arrangement direction 13. In embodiment 1, as Figure 3 As shown by the dashed line A, the straight line 16 connecting the base ends is formed into an arc shape that protrudes further towards the center. That is, the position of the base end of each protrusion 12 protrudes further towards the center from the end in the arrangement direction 13. In this embodiment, the teeth in the center are two central teeth, but it can also be one central tooth, and conversely, about six teeth can also be used as the teeth in the center. Furthermore, in the case of a plurality of teeth such as six teeth, the average height of the teeth can be used.

[0110] Furthermore, the lower binding member 2 is formed in a shape symmetrical to the upper binding member 1, and has a lower tooth 21 and a protrusion 22 constructed in the same manner as the upper tooth 11 and the protrusion 12. In addition, the upper tooth 11 and the lower tooth 21 are arranged in a staggered position in the arrangement direction 13 such that the top surface 12a of the protrusion 12 of the upper tooth 11 and the bottom surface 12d of the protrusion 22 of the lower tooth 21 are opposite each other. When the upper binding member 1 and the lower binding member 2 are close together, the upper tooth 11 and the lower tooth 21 are in a meshing state.

[0111] (Explanation of manufacturing method)

[0112] Figure 4 AF is an explanatory diagram of the manufacturing method of the binding component in Example 1. Figure 4 A is an explanatory diagram of the forming process. Figure 4 B is an illustration of the warping process. Figure 4 C is an illustration of the cutting process. Figure 4 D is an explanatory diagram for the first adjustment process. Figure 4 E is an explanatory diagram for the second adjustment process. Figure 4 F is an explanatory diagram of the meshing process.

[0113] Next, the manufacturing method of each binding component 1 and 2 in Example 1 will be described.

[0114] (Forming process)

[0115] exist Figure 4 In embodiment A, during the forming process, a molding die is used to form each binding component 1, 2. The die is used to ensure that the arrangement of the protrusions 12 is in a straight line along the arrangement direction 13. As an example, each binding component 1, 2 of embodiment 1 is made of metal, and as an example of the firing method, it can be formed by metal injection molding. However, it is not limited to metal injection molding, and can also be formed by any method such as precision casting or die casting, machining, stamping, or a combination thereof.

[0116] (Warping process)

[0117] exist Figure 4 In embodiment B, during the warping process, the binding components 1 and 2 manufactured in the forming process are warped. In the warping process of embodiment 1, with the two ends of the binding components 1 and 2 supported by a clamp 31 along the alignment direction 13, a press 32 is used to press the side (back face 17) of the central portion along the alignment direction 13 opposite to the teeth 11 and 21, thereby warping the central portion of the binding components 1 and 2. Therefore, the teeth 11 and 21 of the binding components 1 and 2 are processed into an arc shape so that the central portion along the alignment direction 13 of the base ends protrudes.

[0118] (Cutting process)

[0119] exist Figure 4 In step C, during the cutting process, the back surface 17 of the binding components 1 and 2, which have undergone the warping process, is cut in a manner that makes it flat. That is, the back surface 17 is cut in a manner that makes it flat, corresponding to cases where the back surface 17 becomes arc-shaped due to the warping process or wavy due to deviations during forming. As a result, when the back surface 17 is pressed to apply pressure to bind the media during assembly into the binding device, it is easy to apply pressure to the back surface 17.

[0120] Figure 5 AB is an enlarged view of the main parts of the first adjustment step in Example 1. Figure 5 A is a diagram illustrating the state before adjustment. Figure 5 B is an illustration of the adjusted state.

[0121] (Precision pressing 1: First adjustment step)

[0122] exist Figure 4 In step D, during the first adjustment process, the center positions of the protrusions 12 and 22 are adjusted. Figure 5In embodiment A, if the stamping machine 32 is used to press the binding components 1 and 2 during the warping process, the front ends and center positions 41 of the protrusions 12 and 22 are prone to positional displacement, such as opening outwards more towards the outer side in the arrangement direction 13. In the first adjustment process of embodiment 1, the first mold 42 is pressed onto each protrusion 12 and 22, such as... Figure 5 As shown in B, the center position 41 of each protrusion 12, 22 is adjusted to a predetermined position. That is, the protrusions 12, 22 are pressed to adjust their positions to the center position 41 at a predetermined interval. In addition, in Embodiment 1, the center position 41 is set at the apex (front end) of each protrusion 12, 22.

[0123] In Embodiment 1, the first mold 42 contacts the front bevel 12b and the base bevel 12c and presses the protrusions 12 and 22 to adjust the center position 41. For example, adjustment is made by pressing the entire protrusions 12 and 22. In addition, when pressing the first mold 42, it is necessary to press the back side 17 first. In Embodiment 1, the back side 17 becomes flat during the cutting process, making it easy to press the first mold 42 for adjustment.

[0124] Figure 6 This is an enlarged view of the main parts of the second adjustment process in Example 1.

[0125] (Precision pressing 2: Second adjustment process)

[0126] exist Figure 4 In step E, the shape of the protrusions 12 and 22 is adjusted in the second adjustment process. In the first adjustment process, the protrusions 12 and 22 are pressed and processed using the first mold 42, which sometimes causes the shape of the protrusions 12 and 22 to become uneven. In particular, during adjustments such as adjusting the center position, a large load is applied to each tooth, easily causing the shape to become uneven. Furthermore, corrections with a large contact area with the mold also easily apply a load to the teeth. Figure 6 In the second adjustment step of Embodiment 1, the second mold 51 is pressed onto each of the protrusions 12 and 22, thereby adjusting the shape of each of the protrusions 12 and 22 as follows. Figure 3 The shape is shown in AB. In Embodiment 1, the second mold 51 contacts the front inclined surfaces 12b and 22b and presses the protrusions 12 and 22 to adjust the shape. For example, the adjustment is performed by pressing a portion of the protrusions 12 and 22. Therefore, in the second adjustment step, the portion of the protrusions 12 and 22 pressed is less than in the first adjustment step.

[0127] (Matching: meshing process)

[0128] exist Figure 4 In F, during the engagement process, the binding components 1 and 2, which have undergone the second adjustment process, are engaged with each other to confirm whether they are engaged in a manner that allows for binding of paper bundles.

[0129] (The function of Example 1)

[0130] In the printer U of embodiment 1 having the aforementioned structure, the bundle of recording paper S stacked on the collection tray U3a is clamped and bound by the upper binding part 1 and the lower binding part 2 of the needleless binder U3b.

[0131] Figure 7 AB is an explanatory diagram used in the traditional method of binding paper bundles. Figure 7 A is an illustration of the contact state between the front end of the protrusion of the needleless binding section and the surface of the paper bundle. Figure 7 B is the binding component from Figure 7 The diagram illustrates the state under pressure, as shown in state A.

[0132] exist Figure 7 In section A, in the conventional structure with aligned tooth heights, the actual tooth height in the product varies slightly. This is because the cost per tooth increases during machining, so it is typically manufactured using heating (sintering / metal injection, etc.). In this case, the area of ​​the toothed surface is larger than the area of ​​the back surface, causing it to cool first and resulting in a phenomenon known as shrinkage. Therefore, during firing, the tooth is formed as a slightly concave shape overall, with a slightly concave center and slightly protruding ends compared to the mold shape. Furthermore, the larger the tooth size, the greater the difference in surface area, making this trend more pronounced. In other words, simply designing the tooth tips in a straight line and molding them in a straight mold shape will not result in a straight finish; instead, the overall shape will be concave.

[0133] In conventional structures, when binding the recording paper 01, it is assumed that the front ends of the protrusions 02 and 03 in the center of all directions, i.e., the top surfaces 02a and 03a, will contact the recording paper 01 first. However, if the binding components 04 and 05 are concave as a whole, sometimes the two ends will contact them first instead of the center in the direction of arrangement, resulting in the problem that the recording paper 01 does not contact the top surfaces 02a and 03a as intended.

[0134] When binding record paper 01, if binding components 04 and 05 move closer to each other, then as follows: Figure 7 As shown in B, the recording paper 01 is pressed down and deformed corresponding to the shapes of the protrusions 02 and 03. (This is in contrast to...) Figure 7 In state A, the length L1 of the recording paper 01 between the top surface 02a of the upper protrusion 02 and the top surface 03a of the adjacent lower protrusion 03 is... Figure 7 In state B, the length L2 of the same part of the recording paper 01 is L1 < L2. Therefore, if the recording paper 01 is not stretched due to the stretching between the fibers of the recording paper 01, it cannot be bound and the recording paper 01 will tear.

[0135] Here, if the top surfaces 02a and 03a of the teeth 02B and 03B at both ends of the toothed portion 02B and 03B in the arrangement direction 06 contact the recording paper 01 before the teeth 02A and 03A in the central portion, then the two ends of the recording paper 01 will be restricted by the top surfaces 02a and 03a of the teeth 02B and 03B at both ends. Therefore, the recording paper 01, which is further inward than the top surfaces 02a and 03a of the teeth 02B and 03B at both ends, needs to extend its length from L1 to L2 by utilizing the elongation of the recording paper 01 itself. Therefore, there is a problem that the recording paper 01 is prone to tearing depending on the type of recording paper 01.

[0136] Furthermore, the binding force when binding the recording paper 01 typically depends on the shape of the teeth (protrusions 02, 03) and the binding area (the width of the binding area in the arrangement direction 13 of the binding components 1, 2). The binding area needs to be kept to a certain size, therefore each tooth needs to contribute to the binding force within a limited binding area. As with the prior art described in Patent Documents 2 and 3, if the teeth at both ends are small, there will be teeth that cannot contribute to the binding force, and there will also be problems of unevenness and deviation during binding.

[0137] Figure 8 The AC diagram is an illustration of the structure used in Example 1 for binding paper bundles. Figure 8 A is an explanatory diagram showing the contact state between the front end of the protrusion in the central part of the needleless binding section and the surface of the paper bundle. Figure 8 B is the binding component from Figure 8 The diagram illustrates the state under pressure, as shown in state A. Figure 8 C is the binding component further from Figure 8 The diagram illustrates the state of B under pressure.

[0138] exist Figure 8 In AC, in embodiment 1, the central protrusions 12A and 22A in the arrangement direction 13 are more prominent than the protrusions 12B and 22B at both ends, such as... Figure 8 As shown in Figure A, the central protrusions 12A and 22A contact the media before the other protrusions 12B and 22B. Specifically, during binding, the central protrusions 12A and 22A contact the recording paper S first. Therefore, except for the central portion, the outer side of the recording paper S in the alignment direction 13 is in a state where the recording paper S is not yet restricted. Then, if the recording paper S is pressed down on the central protrusions 12A and 22A, then... Figure 8 As shown in B, the recording paper S can move from the outside to the inside in the arrangement direction 13. Therefore, even if the length does not change from L1 to L2 solely due to the elongation of the recording paper S itself, it can be length L2 including the portion that enters from the outside to the inside. Therefore, even if the type of recording paper S is one that is difficult to elongate, the recording paper S can be bound without tearing it.

[0139] In particular, in the binder U3b of Embodiment 1, the protrusions 12A, 22A of the central portions are most protruded and the amount of protrusion decreases toward the outer side. Therefore, as the binding members 1, 2 are pressed in, it is easy for the flow to proceed from the outer side in the alignment direction 13 to the inner side in order, and it becomes difficult to tear in the entire binding region.

[0140] Also, the binder U3b of Embodiment 1 protrudes the protrusions 12A, 22A of the central portions in the warping process. Therefore, the binding members 1, 2 themselves can use the conventional structure in which the central portions are not protruded, and there is no need to change the device itself to be formed. Also, the binding members 1, 2 differ in the thickness of the material at the front end and the base end of the protrusions 12, 22, and in the process of solidifying the material in the forming process, there are cases in which the degree of thermal expansion and thermal contraction differs and the material deforms (there are cases in which so-called shrinkage occurs). In the warping process of Embodiment 1, by correcting and correcting this deformation, the alignment of the teeth in which the teeth of the central portions are protruded is corrected.

[0141] Also, in the binder U3b of Embodiment 1, the binding members 1, 2 align the center positions 41 of the protrusions 12, 22 in the first adjustment process. If the center positions 41 of the protrusions 12, 22 are offset, when the binding members 1, 2 are brought close to each other and force is applied to the recording paper S, the applied force can be biased, and it can be possible for the binding to become incomplete or for tearing to occur. In relation to this, in Embodiment 1, the center positions 41 are aligned in the first adjustment process, and the recording paper S is less likely to tear and it is easy to reliably perform the binding.

[0142] In particular, in the first adjustment process of Embodiment 1, the first mold 42 contacts the front end bevels 12b, 22b and the base end bevels 12c, 22c. Therefore, the first mold 42 contacts each of the bevels 12b, 12c, 22b, 22c of the protrusions 12, 22 to adjust the center positions 41 in a form in which the entire body except for the R portion of the front end is pressed. In adjustment in which only the front end bevels 12b of the protrusions 12, 22 are pressed, it can be possible for the front end bevels 12b, 22b to be adjusted so as to deform with respect to the base end bevels 12c, 22c, and for the adjustment of the base end bevels 12c, 22c to become insufficient. If the adjustment of the base end bevels 12c, 22c is insufficient, there is a problem in that the offset of the center positions 41 easily becomes large when adjustment is performed in the second adjustment process.

[0143] Further, in the adjustment of pressing only the base end inclined surface 12c of the protrusions 12, 22, the position of the top surface 12a, 22a of the front end inclined surface 12b, 22b can be deviated from the center position 41. If the center position 41 is deviated, the position where the protrusions 12, 22 first contact the surface of the recording paper S (i.e., the position where the recording paper S is restricted) is deviated from the predetermined position. If the interval of the positions where the top surfaces 12a, 22a of the protrusions 12, 22 contact is deviated due to the unevenness of the interval between the protrusions 12, 22, the length of the recording paper S between the top surfaces 12a, 22a is deviated to be shorter or longer. If the length of the recording paper S is shorter, when the recording paper S is elongated in stapling, there is a problem that the margin of elongation is small and the recording paper S is easily torn, and the like. In other words, although there is no particular limitation, it is preferable that the paper is elongated equally from the top of the protrusions toward the base end, and thus it is preferable that the pitch of the protrusions is constant and is aligned with the center of the concave portions to be engaged.

[0144] In contrast to this, in the embodiment 1, the first mold 42 is used to adjust the entire protrusions 12, 22 except for the R portion of the front end, and thus high-precision adjustment is possible compared to the case where the entire protrusions 12, 22 are not pressed. Therefore, in the stapling members 1, 2 of the embodiment 1, the deviation of the interval of the protrusions 12, 22 can be adjusted, and thus tearing of the recording paper S can be suppressed. Here, since the front end is not contacted, the front end portion can be suppressed from being crushed by the load of the mold.

[0145] Further, in the stapler U3b of the embodiment 1, the stapling members 1, 2 adjust the outer shape of the protrusions 12, 22 in the second adjustment process. If the outer shape of the protrusions 12, 22 is not the predetermined shape due to deformation, when the stapling members 1, 2 are brought close to each other to apply a force to the recording paper S, the applied force is deviated, and it can be possible that stapling is not completed or tearing occurs. In contrast to this, in the second adjustment process of the embodiment 1, the outer shape is adjusted, and the recording paper S is not easily torn, and stapling can be reliably performed.

[0146] In particular, in the second adjustment process of Embodiment 1, the second mold 51 contacts and presses the protrusions 12, 22 at the front end slopes 12b, 22b. When the binding members 1, 2 are brought close to each other to bind the recording paper S, the portion of the front end slopes 12b, 22b is the first to start stretching the recording paper S. Therefore, if there is a deviation in the outer shape of the front end slopes 12b, 22b, the force applied to the recording paper S will be deviated, and it can become impossible to bind or it can tear. In particular, if there is a deviation at the start of the stretching, the adverse effects until the final binding state will be large. In contrast, in Embodiment 1, the portion of the front end slopes 12b, 22b to which the force is applied at the start of the binding is adjusted by the second mold 51. Therefore, compared to the case where the front end slopes 12b, 22b are not adjusted, the deviation of the force applied at the start of the binding of the recording paper S can be suppressed, and thus the tearing of the recording paper S and the like can be suppressed.

[0147] Also, as with the protrusions 12, 22 of Embodiment 1, in the shape where the inclination of the base end slopes 12c, 22c is steeper than the inclination of the front end slopes 12b, 22b, at the start of the binding, the force is gradually applied to the recording paper S at the front end slopes 12b, 22b, which are less inclined than the base end slopes 12c, 22c. For example, at the start of the binding, the recording paper S is stretched stably and slowly. Then, after being stretched to a certain degree at the front end slopes 12b, 22b, the recording paper S contacts the highly inclined base end slopes 12c, 22c, and is deformed into a final state by a force greater than the case of the front end slopes 12b, 22b, and the binding is completed. Therefore, if the recording paper S is sharply stretched at the start of the binding, there is a problem that the recording paper S easily tears, and if there is a deviation at the start of the binding, there is a problem that the recording paper S easily tears at the stage of the stretching thereafter. In Embodiment 1, the outer shape of the front end slopes 12b, 22b, which contact the recording paper S at the start of the binding, which is particularly important, is adjusted by the second adjustment process. Therefore, compared to the case where the outer shape adjustment of the front end slopes 12b, 22b is not performed, the tearing of the recording paper S can be suppressed.

[0148] (Modified Example)

[0149] The above describes Embodiment of the present application in detail, but the present application is not limited to the described Embodiment, and various modifications can be made within the scope of the gist of the present application described in the technical solution. Hereinafter, Modified Examples (H01) to (H012) of the present application are exemplified.

[0150] (H01) In the described Embodiment, a printer U is exemplified as an example of an image forming apparatus, but is not limited thereto, and for example, can be constituted by a copying machine, a FAX, or a multifunction peripheral having a plurality of or all functions thereof, and the like. Also, it is not limited to an electrophotographic image forming apparatus, and can be applied to any image forming apparatus such as an inkjet or a thermal transfer method.

[0151] (H02)In the embodiment, as the printer U, a structure using five colors of developers is exemplified, but is not limited thereto, and can be applied to, for example, a monochrome image forming apparatus or an image forming apparatus of four colors or less or six colors or more.

[0152] (H03)In the embodiment, as an example of the image holding unit, an endless intermediate transfer belt B is exemplified, but is not limited thereto. For example, it can be applied to a cylindrical intermediate transfer drum or a photosensitive drum, a photosensitive belt. Also, it can be applied to a structure having no intermediate transfer body and directly recording an image from a photosensitive body to a recording paper S.

[0153] (H04)In the embodiment, there is no particular limitation, and it is preferable to perform the warping process, but in a case where the central portion is not protruded or the central portion is formed in a protruded form in the forming process, the warping process can not be performed. At this time, the deformation (shrinkage) in the forming process can be adjusted in the first adjustment process or the second adjustment process.

[0154] (H05)In the embodiment, there is no particular limitation, and it is preferable to perform the cutting process, but in a case where a jig that holds the back surface 17 can be prepared in each adjustment process, the cutting process can not be performed.

[0155] (H06)In the embodiment, protrusions 12, 22 of the same shape are exemplified, but are not limited thereto. For example, protrusions 12, 22 of different shapes and sizes can be used. In addition, in a case where the shapes of the protrusions 12, 22 are different from each other, a mold 42, 51 needs to be prepared in correspondence thereto. Also, it is preferable to be a structure in which the central protrusion protrudes, but is not limited thereto. For example, it can be configured in a form in which the protrusion amount of the central portion and both end portions is large and the protrusion amount of the intermediate portion is smaller than that of the central portion and both end portions (for example, a W-shaped mold).

[0156] (H07)In the embodiment, the protrusions 12, 22 exemplify a form in which the base end is arc-shaped and the central portion protrudes the most (that is, a form in which the protrusion amount continuously increases), but are not limited thereto. For example, it can be a form in which the base end increases in stages and in steps. Also, it is not limited to a structure in which the protrusion amounts of the protrusions 12, 22 change one by one. For example, it can be a structure in which the protrusion amounts of a plurality of protrusions are the same and the protrusion amounts change in stages, such as a structure in which the protrusion amounts of two protrusions of the central portion are the largest, the protrusion amounts of each of two protrusions outside thereof are the next, the protrusion amounts of each of two protrusions outside thereof are the next, and so on.

[0157] (H08)In the embodiment, a structure in which the post-processor U3 and the main body U1 of the printer are separately provided is exemplified, but can be a structure in which they are integrated.

[0158] (H09)In addition, in Embodiment 1, the entire body excluding the tip end is pressed, but the entire body including the tip end can be pressed in the first mold, and the tip end can be excluded in the second mold. In this case, in particular, in a case where the adjustment amount at the center position is large, the inclusion of the tip end makes the contact area large and easily transmits the force, and a difference between the two tip end side inclined surfaces continuous from the tip end of the tooth is less likely to occur.

[0159] (H010)In Embodiment 1, the first mold is brought into contact with the base end side inclined surface and the tip end side inclined surface, but the first mold can be brought into contact with only the base end side inclined surface. In this case, the base end side inclined surface can be adjusted more.

[0160] (H011)In Embodiment 1, the mold is linear along the arrangement direction, but is not limited thereto. For example, a concave mold can be used so that the arrangement of the convex portion 12 is initially parabolic along the arrangement direction 13. The shape of the concave portion of the mold can be set so that the convex portion 12 is parabolic even when deformation (shrinkage) after being taken out of the concave mold and cooled is taken into account. Therefore, the warping process or the cutting process, the press working process performed in Embodiment 1 can not be performed. Also, in a case where only the press working is performed without the warping process and the like, the center line is less likely to be shifted compared to Embodiment 1 because the warping process and the like are not performed, and therefore, only the press working can be performed.

[0161] (H012)In the embodiment, in the first adjustment process, there is no particular limitation, and it is preferable that the two, the tip end inclined surface 12b, 22b and the base end inclined surface 12c, 22c, are contacted, but at least the base end inclined surface 12c, 22c can be contacted and pressed.

[0162] The above-described embodiments of the present application are provided for the purpose of illustration and explanation. In addition, the embodiments of the present application do not comprehensively and exhaustively include the present application, and do not limit the present application to the disclosed modes. It is obvious that various modifications and changes are self-evident to those skilled in the art to which the present application pertains. The present embodiments are selected and described in order to most easily explain the principles of the present application and its application. Thus, other skilled persons in the art can understand the present application by various modified examples assumed to be optimized for specific uses of various embodiments. The scope of the present application is defined by the above claims and equivalents thereof.

Claims

1. A manufacturing method of a needleless binding portion, the needleless binding portion having a first binding portion having a plurality of concavities and convexities and a second binding portion having a plurality of concavities and convexities disposed opposite to the first binding portion and engaged with the concavities and convexities of the first binding portion, the needleless binding portion binding media to each other by sandwiching the media in a thickness direction of the media with the first binding portion and the second binding portion, the manufacturing method of the needleless binding portion comprising: a forming step of forming the binding portion using a mold; a first adjustment step of adjusting a center position of a convex portion of the binding portion formed using the mold and taken out of the mold, the position of a tip of the convex portion being the center position, a step of pressing a portion of each of the binding portions on an opposite side to a certain portion of the concavities and convexities to warp the certain portion of the concavities and convexities after the forming step and before the first adjustment step, the center positions being arranged at predetermined intervals; and a second adjustment step of adjusting a shape of the convex portion adjusted by the center positions.

2. The manufacturing method of the needleless binding portion according to claim 1, wherein a step of processing so that the portion on the opposite side becomes flat is performed after the step of warping and before the first adjustment step.

3. The manufacturing method of the needleless binding portion according to claim 1 or 2, wherein the convex portion has a first inclined surface and a second inclined surface located on a base end side more than the first inclined surface, and the first adjustment step of adjusting the center position of the convex portion using a first mold in contact with the second inclined surface is performed.

4. The manufacturing method of the needleless binding portion according to claim 3, wherein the first mold also comes in contact with the first inclined surface.

5. The manufacturing method of the needleless binding portion according to claim 4, wherein the second adjustment step of adjusting a shape of a tip of the convex portion using a second mold in contact with the first inclined surface of the tip side of the convex portion is performed.

6. The manufacturing method of the needleless binding portion according to claim 3, wherein an inclination of an outer surface of the second inclined surface on the base end side is steeper than an inclination of an outer surface of the first inclined surface of the convex portion.

7. The manufacturing method of the needleless binding portion according to claim 4, wherein an inclination of an outer surface of the second inclined surface on the base end side is steeper than an inclination of an outer surface of the first inclined surface of the convex portion.

8. The manufacturing method of the needleless binding portion according to claim 5, wherein an inclination of an outer surface of the second inclined surface on the base end side is steeper than an inclination of an outer surface of the first inclined surface of the convex portion.

9. The manufacturing method of the needleless binding portion according to claim 1, wherein the convex portion has a first inclined surface and a second inclined surface located on a base end side more than the first inclined surface, and the second adjustment step of adjusting a shape of the convex portion using a second mold not in contact with the second inclined surface is performed.

10. The manufacturing method of the needleless binding portion according to claim 1, wherein in the first adjustment step and the second adjustment step, the mold does not come in contact with a tip of the convex portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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