Curve guiding composite device for guiding leg elastic line to form leg contour

Abstract

The utility model discloses a curve guiding composite device for guiding a leg elastic line to form a leg contour. The curve guiding composite device comprises a supply component and a guiding device which are sequentially arranged in the MD direction. The guiding device at least comprises a swing rod. The swing rod is configured to swing back and forth along the outer side of the CD direction and the inner side of the CD direction. A leading-out part is arranged at the tail end of the swing rod, a transition piece is arranged on the swing rod, and a first guide path is formed between the supply component and the transition piece; a second guide path is formed between the transition piece and the leading-out part on the swing rod; the leg elastic line is conveyed to the transition piece through the first guide path and is conveyed to the leading-out part through the second guide path; when the swing rod swings back and forth along the outer side of the CD direction and the inner side of the CD direction, the length of the second guiding path between the transition piece and the guiding-out part is kept unchanged all the time. The distances between the leg elastic lines on the two sides of the center line of the disposable diaper are consistent, and the overall quality of the disposable diaper is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of disposable sanitary product manufacturing equipment, in particular to the fields of baby pull-up pants, adult pull-up pants, women's sanitary pants, etc., and more particularly to a curve guiding composite device for guiding leg elastic lines to form leg contours. Background Art

[0002] Disposable diapers typically have leg elastic threads that conform to the leg contour. Prior art manufacturing equipment for disposable diapers incorporates a curved guide composite device to allow at least one set of leg elastic threads (a set of leg elastic threads may include multiple leg elastic threads) to be positioned along the leg contour, thereby conforming the leg elastic threads to a predetermined leg contour.

[0003] Combine Figure 1 and Figure 2 The conventional curved guide composite device includes a supply member 1 and a guide device arranged sequentially along the MD direction. Two sets of supply members 1 and two sets of guide devices are arranged along the CD direction. Each set of supply members 1 corresponds to a set of guide devices, and each set of supply members 1 and guide devices conveys a set of leg elastic threads S15. The MD direction is the flow direction of the leg elastic threads S15, while the CD direction is perpendicular to the flow direction of the leg elastic threads S15.

[0004] Along the MD direction, the supply member 1 delivers the leg elastic thread S15 delivered from the upstream side to the guide device. The guide device has a swing rod 21 driven by a motor. The swing rod 21 swings back and forth along the CD direction outer side and CD direction inner side under the drive of the motor, that is, the swing rod 21 swings outward A (as shown in FIG. Figure 1 As shown) and the inner swing B of the pendulum 21 (as shown Figure 2 The end of the swing rod 21 has a lead-out portion M. The leg elastic thread S15 is fed to the lead-out portion M via a guide path L between the supply member 1 and the lead-out portion M at the end of the swing rod 21. The lead-out portion M has a through hole, through which the leg elastic thread S15 passes.

[0005] When the rocker arm 21 swings back and forth along the outer side and the inner side of the CD direction driven by the motor, the guide path L between the supply member 1 and the lead-out part M will change, thereby causing the tension of the leg elastic line S15 between the supply member 1 and the lead-out part M to change.

[0006] like Figure 1As shown, when the rocker arm 21 swings outward A, the guide path L between the supply member 1 and the lead-out portion M becomes shorter, the tension of the leg elastic line S15 between the supply member 1 and the lead-out portion M becomes smaller (loose), and the position of the leg elastic line S15 relative to the rocker arm 21 lags behind a lot, so that when the multiple leg elastic lines S15 transported along the MD direction are compounded with the first sheet S11 and the second sheet S12, the spacing between the multiple leg elastic lines S15 in the first area T1 will become narrower (for example, the spacing between the multiple leg elastic lines S15 is 2 mm).

[0007] like Figure 2 As shown, when the rocker arm 21 swings inwardly at B, the guide path L between the supply member 1 and the lead-out portion M becomes longer, the tension of the leg elastic line S15 between the supply member 1 and the lead-out portion M becomes greater (tighter), and the position lag of the leg elastic line S15 relative to the rocker arm 21 is less, so that when the multiple leg elastic lines S15 transported along the MD direction are compounded with the first sheet S11 and the second sheet S12, the spacing between the multiple leg elastic lines S15 in the second area T2 will become wider (for example, the spacing between the multiple leg elastic lines S15 is 3.5 mm).

[0008] In the disposable diaper molded product, the first area T1 and the second area T2 are symmetrical about the center line C. If the spacing of the leg elastic lines S15 of the first area T1 and the spacing of the leg elastic lines S15 of the second area T2 are different during the processing, the appearance and wearing comfort of the disposable diaper S will be greatly affected, thereby reducing its quality. Utility Model Content

[0009] The utility model provides a curve guiding composite device for guiding leg elastic lines to form leg contours, so as to solve the technical problem that when the existing curve guiding composite device guides the leg elastic lines to form leg contours, the spacing between multiple leg elastic lines on both sides of the center line of the disposable diaper is different, which affects the appearance and wearing comfort of the disposable diaper.

[0010] The technical solutions provided by this utility model are as follows:

[0011] One object of the present invention is to provide a curve guiding composite device for guiding leg elastic lines to form leg contours, the curve guiding composite device comprising at least:

[0012] The feeding members and the guide devices are sequentially arranged along the MD direction; along the CD direction, the feeding members are arranged in at least one group, and the guide devices are arranged in at least one group; one group of the feeding members corresponds to one group of the guide devices, and one group of the feeding members and one group of the guide devices corresponds to conveying a group of leg elastic threads, wherein the group of leg elastic threads includes a plurality of leg elastic threads;

[0013] The MD direction is the process direction of the leg elastic line, and the CD direction is the direction perpendicular to the process direction of the leg elastic line.

[0014] The supply member is used to deliver the leg elastic thread delivered from the upstream side to the guide device;

[0015] The guide device includes at least one swing rod, and the swing rod is configured to swing back and forth along the outer side of the CD direction and the inner side of the CD direction when the swing rod is positioned perpendicular to the CD direction;

[0016] Wherein, a transition piece is provided on the rocker arm, and a lead-out portion is provided at the end of the rocker arm, so that a first guide path is formed between the supply member and the transition piece; and a second guide path is formed on the rocker arm between the transition piece and the lead-out portion;

[0017] The leg elastic thread is fed to the transition piece via a first guide path between the feeding member and the transition piece, and fed to the outlet portion via a second guide path between the transition piece and the outlet portion;

[0018] When the swing rod swings back and forth along the outer side in the CD direction and the inner side in the CD direction, the transition piece and the lead-out portion are driven to swing back and forth along the outer side in the CD direction and the inner side in the CD direction, and the length of the second guide path between the transition piece and the lead-out portion remains unchanged;

[0019] When the lead-out portion swings back and forth along the outer side in the CD direction and the inner side in the CD direction, the lead-out portion guides the leg elastic thread to form a leg contour of a predetermined shape.

[0020] In a preferred embodiment, the transition piece includes a guide tube;

[0021] A first threading hole is defined in the guide tube, and a length direction of the first threading hole is parallel to an extension direction of the swing rod;

[0022] The leg elastic thread is delivered to the guide tube via a first guide path and is led out through a first threading hole of the guide tube.

[0023] In a preferred embodiment, the diameter of the first threading hole of the guide tube is 2 mm-10 mm; the length of the guide tube is greater than or equal to 20 mm and less than the continuous distance from the rotation center of the rocker arm to the lead-out portion.

[0024] In a preferred embodiment, the transition piece further comprises a guide head, which is a trumpet-shaped structure with a trumpet opening formed inside; the guide head is mounted on an end of the guide pipe away from the outlet portion;

[0025] The bell mouth of the guide head is connected to the first threading hole, and the opening direction of the bell mouth is away from the guide tube;

[0026] The leg elastic thread is transported to the guide head through the first guide path, introduced into the bell mouth of the guide head, and guided out through the first threading hole of the guide tube.

[0027] In a preferred embodiment, a pipe is installed in the lead-out portion, and a second threading hole is provided in the pipe;

[0028] The leg elastic thread is delivered to the tube through the second guide path and introduced into the second threading hole of the tube.

[0029] In a preferred embodiment, the guide device further includes a motor;

[0030] One end of the swing rod away from the lead-out portion is connected to the output shaft of the motor; the motor is used to drive the swing rod to swing back and forth along the outer side of the CD direction and the inner side of the CD direction.

[0031] In a preferred embodiment, the curve guide device further includes a mounting frame, and the motor is mounted on the mounting frame.

[0032] In a preferred embodiment, the curve guide compounding device further comprises a compounding roller;

[0033] The composite rollers are a pair, and along the MD direction, the pair of composite rollers are located on the downstream side of the guide device; the pair of composite rollers extend along the CD direction and are symmetrically arranged perpendicular to the CD direction;

[0034] The pair of composite rollers are used to introduce the first sheet and the second sheet respectively, and composite the first sheet, the second sheet and the leg elastic thread at the composite point so that the leg elastic thread is composited between the first sheet and the second sheet.

[0035] In a preferred embodiment, the feeding member comprises a plurality of guide wheels; along the MD direction, the plurality of guide wheels convey the group of leg elastic threads conveyed from the upstream side to the guide device.

[0036] In a preferred embodiment, there are multiple transition pieces for introducing a group of leg elastic threads conveyed through a first guide path; there are multiple tubes for introducing a group of leg elastic threads conveyed through a second guide path; the number of transition pieces and tubes provided is consistent with the number of leg elastic threads in a group of leg elastic threads.

[0037] Compared with the prior art, the above technical solution of the present invention has at least the following beneficial effects:

[0038] The utility model provides a curved guide composite device for guiding leg elastic threads to form leg contours. A transition piece is provided on a swing arm of the guide device, forming a first guide path between a supply member and the transition piece, and a second guide path is formed on the swing arm between the transition piece and a lead-out portion. The leg elastic threads are conveyed to the transition piece via the first guide path between the supply member and the transition piece, and then to the lead-out portion via the second guide path between the transition piece and the lead-out portion. As the swing arm reciprocates outward and inward in the CD direction, the transition piece and the lead-out portion are both located on the swing arm, ensuring that the length of the second guide path between the transition piece and the lead-out portion remains constant. This ensures that the tension of the leg elastic threads conveyed by the second guide path remains stable to the greatest extent possible. Furthermore, during the reciprocating swing of the swing arm, the spacing between the multiple leg elastic threads on either side of the centerline of the disposable diaper remains consistent, resulting in a more symmetrical leg elastic thread pattern within the disposable diaper, thereby improving the appearance, wearing comfort, and overall quality of the disposable diaper.

[0039] The utility model provides a curved guide composite device for guiding leg elastic threads to form leg contours, wherein a transition piece comprises a guide head and a guide tube. A first threading hole is provided in the guide tube of the transition piece, and the length direction of the first threading hole is parallel to the extension direction of the swing rod. The guide head of the transition piece is a trumpet-shaped structure with a trumpet mouth provided therein. The guide head of the transition piece is configured to facilitate the threading of the leg elastic threads. The leg elastic threads are transported to the guide head via the first guide path, introduced into the trumpet mouth of the guide head, and guided out through the first threading hole of the guide tube, thereby ensuring to a great extent that the tension of the leg elastic threads transported by the second guide path remains stable, so that the spacing between the multiple leg elastic threads on both sides of the center line of the prepared disposable diaper remains consistent, thereby improving the appearance, wearing comfort, and overall quality of the disposable diaper. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 The present invention is a schematic diagram of the outward swing of a swing rod of an existing curve-guided composite device during the preparation process of disposable diapers.

[0042] Figure 2 The present invention is a schematic diagram of the inward swing of a swing rod of an existing curve-guided composite device during the preparation process of disposable diapers.

[0043] Figure 3 It is a schematic diagram of the disposable diaper prepared by the utility model.

[0044] Figure 4 The utility model is a schematic diagram of the disposable diaper prepared by the utility model when it is unfolded in the horizontal direction.

[0045] Figure 5 It is a side view of a curve guiding composite device for guiding the elastic line of the leg to form the leg contour.

[0046] Figure 6 This is a front view of a curve guiding composite device for guiding the leg elastic line to form the leg contour. Figure 5 Here, the pendulum is positioned perpendicular to the CD direction and does not swing.

[0047] Figure 7 It is a front view schematic diagram of the outward and inward swing of the swing rod of the guide device of the utility model.

[0048] Figure 8 It is a side view of the swing rod of the utility model.

[0049] Figure 9 This is a front view of the pendulum rod of the utility model ( Figure 8 J-direction view).

[0050] Figure 10 This is an enlarged view of the transition piece set on the swing rod of the utility model ( Figure 9 (enlarged image of the middle W area).

[0051] Figure 11 This is an enlarged view of the output end of the utility model ( Figure 8 (Enlarged view of region G in middle).

[0052] Figure 12 yes Figure 8 View from the middle RR direction.

[0053] Figure 13 This is a schematic diagram of the outward swing of a swing rod of a curve-guiding composite device for guiding the elastic line of the leg to form the leg contour in Example 1 of the present invention.

[0054] Figure 14 This is a schematic diagram of the inward swing of a swing rod of a curve-guiding composite device for guiding the elastic line of the leg to form the leg contour in Example 1 of the present invention.

[0055] Figure 15 This is a schematic diagram of the outward swing of a swing rod of a curve-guiding composite device for guiding the elastic line of the leg to form the leg contour in the second embodiment of the present invention.

[0056] Figure 16 This is a schematic diagram of the outward swing of a swing rod of a curve-guiding composite device for guiding the elastic line of the leg to form the leg contour in the third embodiment of the present invention. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the usual meanings understood by persons of ordinary skill in the field to which this utility model belongs. The words "first", "second" and similar terms used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0059] It should be noted that the terms "up", "down", "left", "right", "front" and "back" used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0060] Combine Figure 3 and Figure 4 In order to explain the present invention more clearly, it is necessary to explain the structure of the disposable diaper S. The disposable diaper S has mutually perpendicular transverse and longitudinal directions. When unfolded transversely, it can be divided into a front waist portion F1 corresponding to the abdomen, a back portion F2 corresponding to the buttocks, and a crotch portion F3 disposed between the front waist portion F1 and the back portion F2.

[0061] A disposable diaper S comprises an outer covering layer S1 and an absorbent core S2 disposed within the outer covering layer S1. The outer covering layer S1 comprises a first sheet S11, a second sheet S12, and, sandwiched between the first and second sheets S11, elastic abdominal threads S13, hip elastic threads S14, and leg elastic threads S15. These elastic threads (abdomen elastic threads S13, hip elastic threads S14, and leg elastic threads S15) can be made of elastic materials such as natural rubber strips (threads) or synthetic elastic spandex yarn. In this embodiment, the abdominal elastic threads S13, hip elastic threads S14, and leg elastic threads S15 are synthetic elastic spandex yarns with a gauge between 140D and 1200D.

[0062] In order to make the leg area of ​​the disposable diaper S fit better, a group of leg elastic lines S15 extending from the front waist F1 to the crotch F3 and a group of leg elastic lines S15 extending from the back F2 to the crotch F3 are provided in the transverse direction, wherein a group of leg elastic lines S15 comprises a plurality of leg elastic lines S15, and the plurality of leg elastic lines S15 are a curved structure arranged along a predetermined leg contour.

[0063] The disposable diaper S has a center line C in the longitudinal direction (the imaginary center line is set for illustration purposes only; there is no center line in the actual disposable diaper S). In order to improve the aesthetics and comfort of the disposable diaper S, the curve distribution of each set of leg elastic lines S15 on both sides of the center line C in the longitudinal direction and the spacing between adjacent leg elastic lines S15 are required to be symmetrical relative to the center line C. Figure 1 and Figure 2 In the prior art, on both sides of the center line C along the MD direction, the spacing of the leg elastic lines S15 in the first area T1 and the spacing of the leg elastic lines S15 in the second area T2 are different, that is, each group of leg elastic lines S15 located on both sides of the center line C along the MD direction is asymmetric. In order to solve this problem, the utility model provides a curve guiding composite device for guiding the leg elastic lines to form the leg contour.

[0064] Combine Figure 5 、 Figure 6 and Figure 7 According to an embodiment of the present invention, a curve guiding composite device for guiding leg elastic lines to form leg contours is provided, comprising:

[0065] The supply member 1, the guide device 2 and the composite roller 3 are arranged in sequence along the MD direction. Figure 5 and Figure 6 shown.

[0066] The present invention defines: the MD direction is the direction of flow of the leg elastic thread S15, and the CD direction is the direction perpendicular to the direction of flow of the leg elastic thread S15. The MD direction corresponds to the longitudinal direction of the disposable diaper S, and the CD direction corresponds to the transverse direction of the disposable diaper S.

[0067] Since the disposable diaper S is provided with a group of leg elastic lines S15 extending from the front waist F1 to the crotch F3, and a group of leg elastic lines S15 extending from the back F2 to the crotch F3; or only one group of leg elastic lines S15 extending from the front waist F1 to the crotch F3 is provided, or only one group of leg elastic lines S15 extending from the back F2 to the crotch F3 is provided. Therefore, in the present invention, along the CD direction, the supply components 1 are arranged in at least one group, and the guide devices 2 are arranged in at least one group. One group of supply components 1 corresponds to one group of guide devices 2, and one group of supply components 1 and one group of guide devices 2 correspond to conveying one group of leg elastic lines S15. In this embodiment, two groups of supply components 1 are arranged, and two groups of guide devices 2 are also arranged, such as Figure 6 shown.

[0068] The two groups of supply members 1 have the same structure, and the two groups of guide devices 2 have the same structure. In the following embodiments, only one group of supply members 1 and one group of guide devices 2 are described.

[0069] The supply member 1 is used to supply the leg elastic thread S15 supplied from the upstream side to the guide device 2 .

[0070] The supply member 1 includes a plurality of guide wheels, which convey a group of leg elastic threads S15 conveyed from the upstream side to the guide device 2 along the MD direction. Figure 6 As shown, in this embodiment, the supply member 1 includes three guide rollers, which convey three leg elastic threads S15 (here, a group of three leg elastic threads S15) conveyed from the upstream side to the guide device 2 along the MD direction.

[0071] The guide device 2 includes a rocker 21, a motor 23, and a mounting frame 25. The motor 23 is mounted on the mounting frame 25. The rocker 21 is configured such that when the rocker 21 is positioned perpendicular to the CD direction, the rocker 21 swings back and forth along the outer side of the CD direction and the inner side of the CD direction, i.e., the rocker 21 swings outward A and inward B, as shown in FIG. Figure 7 It should be noted that when the position of the swing rod 21 is set perpendicular to the CD direction, that is, the initial state of the swing rod 21 without swinging, when the production line equipment of disposable sanitary products is shut down and then restarted, it is necessary to reset to the initial state with one button.

[0072] Specifically, the end of the rocker 21 has a lead-out portion M. The end of the rocker 21 away from the lead-out portion M is connected to the output shaft of the motor 23. The motor 23 is used to drive the rocker 21 to swing back and forth along the CD direction (outward swing A and inward swing B of the rocker 21).

[0073] like Figure 7 As shown, the angle α of the swing arm 21 as it reciprocates between the outer and inner sides of the CD direction (outward swing A and inward swing B of the swing arm 21) can be set based on the transverse span of the disposable diaper S and the length H of the swing arm 21. Generally, the longer the length H of the swing arm 21, the smaller the angle α; the shorter the length H of the swing arm 21, the larger the angle α. Furthermore, to better enable high-speed operation of the curved guide composite device, the swing arm 21 is made of lightweight materials such as carbon fiber and aluminum alloy.

[0074] According to the embodiment of the present invention, a transition piece 24 is provided on the rocker 21, so that a first guide path L1 is formed between the supply member 1 and the transition piece 24; a second guide path L2 is formed between the transition piece 24 and the outlet portion M on the rocker 21, such as Figure 6 shown.

[0075] The leg elastic thread S15 is fed to the transition piece 24 via a first guide path L1 between the supply member 1 and the transition piece 24 , and fed to the lead-out portion M via a second guide path L2 between the transition piece 24 and the lead-out portion M.

[0076] When the rocker 21 swings back and forth toward the outside of the CD direction and toward the inside of the CD direction (outward swing A and inward swing B of the rocker 21), the transition piece 24 and the lead-out portion M are driven to swing back and forth toward the outside of the CD direction and toward the inside of the CD direction (outward swing A and inward swing B of the rocker 21). Since the transition piece 24 and the lead-out portion M are both provided on the rocker 21, the length of the second guide path L2 between the transition piece 24 and the lead-out portion M remains unchanged. Figure 7 shown.

[0077] When the lead-out portion M swings back and forth toward the outside in the CD direction and toward the inside in the CD direction (the swing rod 21 swings outward A and inward B), the lead-out portion M guides the leg elastic wire S15 to form a predetermined leg contour.

[0078] Combine Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12According to an embodiment of the present invention, the transition piece 24 includes a guide head 242 and a guide tube 241. A first threading hole 423 is provided in the guide tube 241, and the length direction of the first threading hole 243 is parallel to the extension direction of the rocker 21. The guide head 242 is a trumpet-shaped structure with a trumpet mouth 244 provided therein. The guide head 242 is mounted on an end of the guide tube 241 away from the outlet portion M. The trumpet mouth 244 of the guide head 242 is connected to the first threading hole 243, and the opening direction of the trumpet mouth 244 is away from the guide tube 241, as shown in FIG. Figure 10 shown.

[0079] Since the transition piece 24 needs to pass through the leg elastic line S15, the transition piece 24 is made of wear-resistant materials such as plastic, ceramic, rubber, etc.

[0080] Combine Figure 6 and Figure 10 The leg elastic cord S15 is conveyed via the first guide path L1 to the guide head 242 of the transition piece 24, introduced into the bell mouth 244 of the guide head 242, and then guided out through the first threading hole 243 of the guide tube 241. Since the leg elastic cord S15 is in the form of a linear or strip material and needs to pass through the entire transition piece 24, the guide head 242 is configured as a bell-shaped structure with a bell mouth 244 to facilitate the threading of the leg elastic cord S15.

[0081] like Figure 10 As shown, in order to better maintain the stability of the tension of the leg elastic line S15 transported by the second guide path L2 between the transition piece 24 and the outlet part M, the diameter D1 of the first threading hole 243 of the guide tube 241 of the transition piece 24 of the utility model is 2mm-10mm, and the length D2 of the guide tube 241 is greater than or equal to 20mm (D2≥20mm) and less than the distance H1 from the rotation center of the rocker arm 21 to the outlet part M (D2

[0082] According to an embodiment of the present invention, there are multiple transition pieces 24, which are consistent with the number of leg elastic threads S15 in a group of leg elastic threads S15, and are used to introduce a group of leg elastic threads S15 conveyed through the first guide path L1. Figure 10 As shown, in this embodiment, the number of transition pieces 24 is the same as the number of guide wheels of the supply member 1, that is, there are three transition pieces 24, which are used to introduce three leg elastic lines S15 transported through the first guide path L1 (here, the three leg elastic lines S15 are a group).

[0083] like Figure 11 and Figure 12 As shown, according to an embodiment of the present invention, a pipe 22 is installed in the lead-out portion M, and a second threading hole 221 is opened in the pipe 22. The length direction of the second threading hole 221 is parallel to the extension direction of the swing rod 21.​

[0084] Combine Figure 6 、 Figure 10 、 Figure 11 and Figure 12 After the leg elastic line S15 is led out through the first threading hole 243 of the guide tube 241, it is transported to the pipe 22 of the lead-out part M through the second guide path L2 and introduced into the second threading hole 221 of the pipe 22.

[0085] According to an embodiment of the present invention, there are multiple tubes 22 for introducing a group of leg elastic threads S15 transported through the second guide path L2. Figure 12 As shown, in this embodiment, the tube 22 is consistent with the number of leg elastic lines S15 in a group of leg elastic lines S15, and the tube 22 is the same as the number of guide wheels of the transition piece 24 and the supply member 1, that is, there are 3 tubes 22, which are used to introduce 3 leg elastic lines S15 transported through the second guide path L2 (here, 3 leg elastic lines S15 are a group).

[0086] Combine Figure 5 and Figure 6 According to an embodiment of the present invention, the composite rollers 3 are a pair. Along the MD direction, the pair of composite rollers are located on the downstream side of the guide device 2. The pair of composite rollers extend along the CD direction and are symmetrically arranged perpendicular to the CD direction.

[0087] A pair of composite rollers 3 are used to convey the first sheet S11 and the second sheet S12 respectively, and composite the first sheet S11, the second sheet S12 and the leg elastic line S15 at the composite point so that the leg elastic line S15 is composited between the first sheet S11 and the second sheet S12.

[0088] Furthermore, in order to enable the first sheet material S11, the second sheet material S12 and the leg elastic thread S15 to be bonded and fixed, a gluing device 4 is provided on the process line before the first sheet material S11 and / or the second sheet material S12 are compounded.

[0089] As the rocker arm 21 reciprocates outward and inward in the CD direction (outward swing A and inward swing B of the rocker arm 21), it drives the transition piece 24 and the lead-out portion M to reciprocate outward and inward in the CD direction (outward swing A and inward swing B of the rocker arm 21). As the lead-out portion M reciprocates outward and inward in the CD direction (outward swing A and inward swing B of the rocker arm 21), the lead-out portion M guides the leg elastic wire S15 to form the predetermined leg contour.

[0090] The following describes the process of forming the leg contour with the leg elastic thread S15 of the present invention.

[0091] Example 1.

[0092] like Figure 13 As shown, the swing arm 21 swings outward in the CD direction (swing arm 21 swings outward A), and at the same time, the leg elastic thread S15 is conveyed to the supply member 1 in the MD direction, and the supply member 1 conveys the leg elastic thread S15 to the guide device 2.

[0093] The leg elastic thread S15 is transported to the transition piece 24 via the first guide path L1 between the supply member 1 and the transition piece 24 , introduced into the bell mouth 244 of the guide head 242 , and guided out through the first threading hole 243 of the guide tube 241 .

[0094] After the leg elastic line S15 is led out from the first threading hole 243 of the catheter 241, it is transported to the outlet part M through the second guide path L2 between the transition piece 24 and the outlet part M, and is introduced into the second threading hole 221 of the pipe 22 installed in the outlet part M, and then led out from the second threading hole 221 of the pipe 22.

[0095] During the outward swing of the swing rod 21 in the CD direction (outward swing A of the swing rod 21 ), the lead-out portion M drives the leg elastic line S15 to form a curve extending from the inner side in the CD direction to the outer side in the CD direction.

[0096] After the leg elastic line S15 is led out through the second threading hole 221 of the tube 22, it is transported to the composite roller 3, and the first sheet S11, the second sheet S12 and the leg elastic line S15 are composited at the composite point by the composite roller 3, so that the leg elastic line S15 forms a leg contour on one side of the center line C of the disposable diaper in the longitudinal direction.

[0097] like Figure 14 As shown, the rocker arm 21 swings inwardly along the CD direction (the rocker arm 21 swings inwardly B), and at the same time, the leg elastic line S15 is transported to the supply component 1 along the MD direction, and then transported to the transition component 24 through the first guide path L1 between the supply component 1 and the transition component 24. The leg elastic line S15 is introduced into the bell mouth 244 of the guide head 242 and is led out through the first threading hole 243 of the guide tube 241.

[0098] After the leg elastic thread S15 is guided out from the first threading hole 243 of the guide tube 241 , the supply member 1 delivers the leg elastic thread S15 to the guide device 2 .

[0099] The leg elastic line S15 is transported to the outlet portion M through the second guide path L2 between the transition piece 24 and the outlet portion M, and is introduced into the second threading hole 221 of the tube 22 installed in the outlet portion M, and then is led out from the second threading hole 221 of the tube 22.

[0100] During the inner swing of the swing rod 21 along the CD direction (the inner swing B of the swing rod 21 ), the lead-out portion M drives the leg elastic line S15 to form a curve extending from the outer side in the CD direction to the inner side in the CD direction.

[0101] After the leg elastic line S15 is led out through the second threading hole 221 of the tube 22, it is transported to the composite roller 3, and the first sheet S11, the second sheet S12 and the leg elastic line S15 are composited at the composite point by the composite roller 3, so that the leg elastic line S15 forms a leg contour on the other side of the center line C of the disposable diaper in the longitudinal direction.

[0102] The swing rod 21 swings inwardly along the CD direction (swing rod 21 inward swing B) once, and swings outwardly along the CD direction (swing rod 21 outward swing A) once, guiding the leg elastic line S15 to form the leg contours on both sides of the center line C of the disposable diaper S. It should be noted that when the swing rod 21 stops, since the first sheet S11 and the second sheet S12 are still being transported to the downstream side, a straight line (such as Figure 13 and Figure 14 (As shown in the area at the centerline C, the longer the swing arm 21 stops, the longer the straight line length. Therefore, whether the swing arm 21 needs to pause depends on the desired leg shape. Furthermore, in this embodiment, along the CD direction, the two sets of leg elastic threads S15 are spaced a certain distance apart at the centerline C, which is determined by the style of the disposable diaper S.)

[0103] Example 2.

[0104] The difference between this embodiment and the first embodiment is that along the CD direction, the two groups of leg elastic lines S15 are partially crossed. Figure 15 As shown, a group of leg elastic lines S15 extending from the front waist portion F1 to the crotch portion F3 and another group of leg elastic lines S15 extending from the back portion F2 to the crotch portion F3 partially intersect at the center line C.

[0105] Specifically, in this embodiment, two leg elastic lines S15 in a group of leg elastic lines S15 extending from the front waist F1 to the crotch F3 intersect with two leg elastic lines S15 in another group of leg elastic lines S15 extending along the back F2 to the crotch F3 at the center line C.

[0106] In this embodiment, when the swing rod 21 swings inwardly along the CD direction (not shown), in order to prevent the swing rods 21 of the two sets of guide devices 2 from interfering with each other, they can be staggered in space, and the specific arrangement can be determined according to actual conditions.

[0107] Example 3.

[0108] The difference between this embodiment and the first embodiment is that along the CD direction, the two groups of leg elastic lines S15 are completely crossed. Figure 16As shown, a group of leg elastic lines S15 extending from the front waist portion F1 to the crotch portion F3 and another group of leg elastic lines S15 extending from the back portion F2 to the crotch portion F3 all intersect at the center line C.

[0109] Specifically, in this embodiment, the three leg elastic lines S15 in a group of leg elastic lines S15 extending from the front waist F1 to the crotch F3 and the three leg elastic lines S15 in another group of leg elastic lines S15 extending from the back F2 to the crotch F3 all intersect at the center line C.

[0110] In this embodiment, when the swing rod 21 swings inwardly along the CD direction (not shown), in order to prevent the swing rods 21 of the two sets of guide devices 2 from interfering with each other, they can be staggered in space, and the specific arrangement can be determined according to actual conditions.

[0111] In the present invention, during the outward swing of the rocker arm 21 along the CD direction (outward swing A of the rocker arm 21) and the inward swing toward the CD direction (inward swing B of the rocker arm 21), the length of the second guide path L2 between the transition piece 24 and the outlet portion M remains unchanged, thereby ensuring as much as possible that the tension of the leg elastic line S15 transported by the second guide path L2 remains stable. Moreover, since the transition piece 24 has a guide head 242 with a trumpet-shaped structure and the length direction of the first threading hole 243 of the guide tube 241 is parallel to the extension direction of the rocker arm 21, the tension of the leg elastic line S15 transported by the second guide path L2 is further ensured to a great extent to remain stable, thereby keeping the spacing between the multiple leg elastic lines S15 on both sides of the center line C of the disposable diaper S consistent, thereby improving the appearance, wearing comfort and overall quality of the disposable diaper S.

[0112] There are a few points to note:

[0113] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0114] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present invention are exaggerated or reduced, that is, these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or intervening elements may be present.

[0115] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0116] The above are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A curve guiding composite device for guiding leg elastic lines to form leg contours, characterized in that: The curve guiding composite device at least comprises: The feeding members and the guide devices are sequentially arranged along the MD direction; along the CD direction, the feeding members are arranged in at least one group, and the guide devices are arranged in at least one group; one group of the feeding members corresponds to one group of the guide devices, and one group of the feeding members and one group of the guide devices corresponds to conveying a group of leg elastic threads, wherein the group of leg elastic threads includes a plurality of leg elastic threads; The MD direction is the process direction of the leg elastic line, and the CD direction is the direction perpendicular to the process direction of the leg elastic line. The supply member is used to deliver the leg elastic thread delivered from the upstream side to the guide device; The guide device includes at least one swing rod, and the swing rod is configured to swing back and forth along the outer side of the CD direction and the inner side of the CD direction when the swing rod is positioned perpendicular to the CD direction; Wherein, a transition piece is provided on the rocker arm, and a lead-out portion is provided at the end of the rocker arm, so that a first guide path is formed between the supply member and the transition piece; and a second guide path is formed on the rocker arm between the transition piece and the lead-out portion; The leg elastic thread is fed to the transition piece via a first guide path between the feeding member and the transition piece, and fed to the outlet portion via a second guide path between the transition piece and the outlet portion; When the swing rod reciprocates along the outer side and the inner side of the CD direction, the transition piece and the lead-out portion are driven to reciprocate along the outer side and the inner side of the CD direction, and the length of the second guide path between the transition piece and the lead-out portion remains unchanged; When the lead-out portion swings back and forth along the outer side in the CD direction and the inner side in the CD direction, the lead-out portion guides the leg elastic thread to form a leg contour of a predetermined shape.

2. The curve guiding composite device according to claim 1, characterized in that: The transition piece includes a guide tube; A first threading hole is defined in the guide tube, and a length direction of the first threading hole is parallel to an extension direction of the swing rod; The leg elastic thread is delivered to the guide tube via a first guide path and is led out through a first threading hole of the guide tube.

3. The curve guiding composite device according to claim 2, characterized in that: The diameter of the first threading hole of the guide tube is 2mm-10mm; the length of the guide tube is greater than or equal to 20mm and less than the distance between the rotation center of the rocker arm and the lead-out portion.

4. The curve guiding composite device according to claim 2, characterized in that: The transition piece also includes a guide head; The guide head is a trumpet-shaped structure with a trumpet opening formed inside; the guide head is mounted on an end of the guide tube away from the outlet portion; The bell mouth of the guide head is connected to the first threading hole, and the opening direction of the bell mouth is away from the guide tube; The leg elastic thread is transported to the guide head through the first guide path, introduced into the bell mouth of the guide head, and guided out through the first threading hole of the guide tube.

5. The curve guiding composite device according to claim 1, characterized in that: A pipe is installed in the lead-out portion, and a second threading hole is provided in the pipe; The leg elastic thread is delivered to the tube through the second guide path and introduced into the second threading hole of the tube.

6. The curve guiding composite device according to claim 1, characterized in that: The guide device also includes a motor; One end of the swing rod away from the lead-out portion is connected to the output shaft of the motor; the motor is used to drive the swing rod to swing back and forth along the outer side of the CD direction and the inner side of the CD direction.

7. The curve guiding composite device according to claim 6, characterized in that: The curve guide device also includes a mounting frame, and the motor is mounted on the mounting frame.

8. The curve guiding composite device according to claim 1, characterized in that: The curve guide compound device also includes a compound roller; The composite rollers are a pair, and along the MD direction, the pair of composite rollers are located on the downstream side of the guide device; the pair of composite rollers extend along the CD direction and are symmetrically arranged perpendicular to the CD direction; The pair of composite rollers are used to convey the first sheet and the second sheet respectively, and composite the first sheet, the second sheet and the leg elastic thread at a composite point so that the leg elastic thread is composited between the first sheet and the second sheet.

9. The curve guiding composite device according to claim 1, characterized in that: The feeding member includes a plurality of guide rollers, and the plurality of guide rollers feed the group of leg elastic threads fed upstream in the MD direction to the guide device.

10. The curve guiding composite device according to claim 5, characterized in that: There are multiple transition pieces, which are used to introduce a group of leg elastic threads conveyed through the first guide path; There are multiple tubes for introducing a group of leg elastic threads delivered through the second guide path; The number of the transition pieces and the tube pieces is consistent with the number of the leg elastic threads in a group of leg elastic threads.

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