A processing device for preventing the elastic waistband of a disposable diaper from shrinking

Abstract

The present invention relates to the technical field of diaper processing, and discloses a processing device for preventing the elastic waistband of a diaper from shrinking. The device is characterized in that it includes a frame, a lower non-woven fabric feeding roller, an upper non-woven fabric feeding roller, an elastic feeding roller, and a cutting member arranged on the frame. The cutting member includes a cutting motor, a driving rod, a cam, and a cutting strip. The cutting motor is fixedly arranged on the frame, the driving end of the cutting motor is fixedly connected to the driving rod, the cam is fixedly connected to the driving rod, the cutting motor drives the driving rod to drive the cam to rotate, a cutting strip is radially arranged on the protruding part of the cam, and a feeding supplement mechanism is also arranged on the frame. In the present invention, the cutting motor drives the driving rod to rotate, the driving rod drives the cam to rotate, and the protruding part of the cam drives the cutting strip to cut the elastic into sections. The upper and lower layers of the elastic are non-woven fabrics. The present invention solves the problem of large shrinkage of the elastic waistband.

Description

Technical Field

[0001] The present invention relates to the technical field of diapers, and particularly to a processing device for preventing the shrinkage of the elastic waistband of diapers. Background Art

[0002] With the continuous improvement of production processes, diapers have evolved from their initial single functions of leak prevention and urine absorption to functions such as leak prevention, breathability, urine absorption, antibacterial properties, and the addition of stretchable elastic waistbands and three-dimensional leak-proof edges. New types of tea diapers have added the functions of anti-inflammatory, antibacterial, and odor removal on the basis of traditional diapers.

[0003] The Chinese patent application publication number CN111973346A discloses a decompression waistband for diapers and its manufacturing process, including an elastic hot melt adhesive layer. The elastic hot melt adhesive layer is in a strip-like structure, with a first non-woven fabric layer and a second non-woven fabric layer provided on the front and back respectively. The first non-woven fabric layer, the elastic hot melt adhesive layer, and the second non-woven fabric layer are closely adhered to each other in sequence in a face-to-face contact form. By adopting a differential pressure bonding process, the produced elastic hot melt adhesive layer has better ductility and elasticity, and is closely adhered to the first non-woven fabric layer and the second non-woven fabric layer in all directions of 360°, ensuring that the overall stretching and contraction are in face-to-face contact with the user's skin surface, increasing the contact area, effectively relieving the pressure of the elastic waistband on the waist, and bringing comfort to the user.

[0004] The Chinese invention patent with the authorization announcement number CN102113937B discloses a device and method for applying a transverse elastic waistband to diapers. The invention relates to a device and method for applying a transverse elastic waistband to diapers with simple elastic material production steps, good elasticity of the produced elastic material, low cost, and high online production efficiency. It includes an elastic band unwinding mechanism, a non-woven fabric wrapping mechanism, an elastic band glue gun, a material traction component, a cutting knife component, a bottom knife and a turning wheel device, an elastic waistband glue gun, a negative pressure adsorption wheel device, and a negative pressure belt conveying component. The elastic band unwinding mechanism is the first station, followed by the elastic band glue gun, the non-woven fabric wrapping mechanism, the material traction component, the bottom knife and the turning wheel device, the cutting knife component, the elastic waistband glue gun, the negative pressure adsorption wheel device, and the negative pressure belt conveying component. Advantages: First, the production steps of the elastic material are simple; second, the produced elastic material has good elasticity and low cost; third, the online production efficiency is high; fourth, the structure is reasonable, the operation is reliable, and the faults are few; fifth, it can be used for processing products of various sizes.

[0005] However, in the prior art, when the elastic in the elastic waistband of a disposable diaper is a complete single piece of elastic, the waistband will fully retract with a relatively large retraction force. However, when using a longer elastic to make the retracted waistband meet the usable waist circumference range, the non-woven fabric will accumulate thickly due to the large retraction of the elastic, which is too burdensome for the delicate skin of a baby. Also, when one end of the waistband breaks, the entire waistband will retract completely, causing the waistband to become tight and affecting the comfort of the baby when using the disposable diaper. Summary of the Invention

[0006] The purpose of the present invention is to provide a processing device for preventing the elastic waistband of a disposable diaper from retracting, and the present invention solves the problem of large retraction of the elastic waistband.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: A processing device for preventing the elastic waistband of a disposable diaper from retracting, characterized in that: it includes a frame, a lower non-woven fabric feeding roller, an upper non-woven fabric feeding roller, an elastic feeding roller, and a cutting member arranged on the frame. The cutting member includes a cutting motor, a driving rod, a cam, and a cutting strip. The cutting motor is fixedly arranged on the frame, the driving end of the cutting motor is fixedly connected to the driving rod, the cam is fixedly connected to the driving rod, the cutting motor drives the driving rod to drive the cam to rotate, and a cutting strip is radially arranged on the protruding part of the cam. A feeding supplement mechanism is also arranged on the frame.

[0008] The further setting of the present invention is: The feeding supplement mechanism includes a feeding supplement roller, a feeding supplement motor, an upper cutting knife, a lower cutting knife, a control frame, and a control member. The control frame is detachably arranged on the frame, the feeding supplement roller is rotatably connected to the frame, the driving end of the feeding supplement motor is fixedly connected to the feeding supplement roller, both the upper cutting knife and the lower cutting knife are slidably connected to the control frame, the control member is arranged on the control frame, and the control member drives the upper cutting knife and the lower cutting knife to approach or move away from each other.

[0009] The further setting of the present invention is: The control member includes a control rod, an adjusting ring, a rotating rod, a rotating ring, an adjusting rod, and a control motor. The control motor is arranged on the control frame, the control motor drives the control rod to rotate, the control rod is rotatably connected to the control frame, the adjusting ring is radially arranged on the control rod, the rotating ring is radially movably connected below the control rod, a through hole is radially and axially opened at the lower end of the control rod, a through hole coaxial with the through hole is opened on the rotating ring, the rotating rod is radially movably and coaxially inserted into the through hole and the through hole, and both ends of the adjusting rod are hinged to the rotating ring and the adjusting ring respectively.

[0010] A further setting of the present invention is that upper cutter supports are arranged on both sides of the upper cutter, lower cutter supports are arranged on both sides of the lower cutter, inner sliding grooves and outer sliding grooves are arranged on both sides of the control frame, the upper cutter supports are slidably arranged in the inner sliding grooves, the lower cutter supports are slidably arranged in the outer sliding grooves, push rods are arranged on the side of the upper cutter supports and the lower cutter supports close to the rotating ring, the two push rods are respectively perpendicular to the upper cutter supports and the lower cutter supports, and the upper cutter supports and the lower cutter supports are relatively movably clamped in the rotating ring.

[0011] A further setting of the present invention is that a limiting member is also arranged on the rotating rod, the limiting member includes a limiting rod, a limiting disk and a limiting seat, the limiting seat is fixedly arranged above the control frame, an external thread is arranged on the limiting rod, an internal thread is arranged on the limiting seat, the limiting rod is threadedly connected to the limiting seat, the limiting disk is fixedly connected to the lower end of the limiting rod, the limiting disk is movably clamped in the adjusting ring, a limiting strip is axially arranged on the control rod, a limiting groove is opened in the adjusting ring, and the adjusting ring is slidably connected to the control rod through the cooperation of the limiting groove and the limiting strip.

[0012] A further setting of the present invention is that the adjusting rod includes an upper adjusting plate, an adjusting column and a lower adjusting plate, the diameters of the upper adjusting plate and the lower adjusting plate are larger than the diameter of the adjusting column, and the limiting disk is movably clamped between the upper adjusting plate and the lower adjusting plate.

[0013] A further setting of the present invention is that moving grooves are axially arranged on the opposite sides of the control rod, the rotating rod is inserted into the two moving grooves through the insertion holes, and the rotating ring is arranged in the two moving grooves.

[0014] A further setting of the present invention is that a driving ball is arranged at the end of the push rod, and the driving ball is movably clamped in the rotating ring.

[0015] A further setting of the present invention is that a pressure roller is also arranged on the machine frame, and the pressure roller is located on the side of the feeding mechanism close to the upper non-woven fabric feeding roller.

[0016] The beneficial effects of the present invention are:

[0017] 1. When all the elastics inside the elastic waistband of the diaper are a complete single piece of elastic, the waistband will fully retract. At the same time, when one end of the waistband is disconnected, the entire waistband will retract back completely, causing the waistband to become tight and affecting the comfort of the baby using the diaper. Therefore, in the process of manufacturing the waistband of the present invention, a complete piece of elastic is cut into sections. In this way, when the end of the elastic becomes loose, only a small section of the elastic will retract, which has little impact on the overall tightness of the waistband and can still be used. In the present invention, the cutting motor drives the driving rod to rotate, the driving rod drives the cam to rotate, and the protruding part of the cam drives the cutting strip to cut the elastic into sections. The upper and lower layers of the elastic are non-woven fabrics, and the cutting strip cannot break them. Therefore, only the elastic between the upper and lower non-woven fabrics is broken. Thus, the present invention solves the problem of the retraction of the elastic waistband.

[0018] 2. When the elastic is broken, the end of the broken elastic will retract appropriately, and during the retraction process, a retraction gap will appear between the upper and lower non-woven fabrics. At the same time, there are only the upper and lower non-woven fabrics at the broken end of the elastic, and the non-woven fabrics here are also subjected to a relatively large squeezing and cutting force, making them relatively fragile during subsequent use. The feeding mechanism in the present invention can add a small section of connecting fabric above the elastic to be broken. The presence of this fabric can not only prevent excessive retraction of the elastic but also increase the thickness here, making its connection more stable.

[0019] 3. The feeding mechanism in the present invention can achieve the effect of supplementing fabric at the place where the elastic is to be cut. The feeding motor drives the feeding roller to rotate, and the fabric is wound around the feeding roller. Then the fabric passes between the upper cutting knife and the lower cutting knife and then falls above the elastic. Since there is glue between the elastic and the lower non-woven fabric, the fabric will be driven to move under the action of the glue's viscosity and the conveying force. After moving a certain distance, the control part will control the upper cutting knife and the lower cutting knife to cut the fabric. Due to the guiding action of the side baffle of the lower cutting knife, the gravity of the fabric, and the conveying action of the feeding roller, the fabric can be continuously conveyed forward, so that the cut fabric can fall on the elastic. Then, under the appropriate pressure of the pressing roller, the supplemented fabric can be attached to the lower non-woven fabric and the elastic.

[0020] 4. In the present invention, the control motor drives the control rod to rotate, and the control rod drives the adjusting ring and the rotating ring to rotate. The adjusting ring and the rotating ring are connected by an adjusting rod. By adjusting the limit rod, the limit rod drives the limit disk to move upward. Since the limit disk is clamped between the upper adjusting plate and the lower adjusting plate of the adjusting ring, and the adjusting ring is slidably connected to the control rod, the limit disk drives the adjusting ring to move upward. Since the length of the adjusting rod is fixed, when the adjusting ring moves upward, the distance between the adjusting ring and the rotating ring increases, causing the side of the rotating ring connected to the adjusting rod to tilt upward. The upper cutter support is movably clamped on the rotating ring through a push rod and is slidably connected to the control frame. Therefore, when the adjusting ring and the rotating ring rotate synchronously, the rotating ring floats up and down around the rotating rod, driving the upper cutter support to move up and down along the control frame. The lower cutter support is the same as the upper cutter support. Since the upper cutter support and the lower cutter support are arranged oppositely, when the upper cutter support moves upward, the lower cutter support moves downward, achieving the effect of the upper cutter and the lower cutter cutting against each other. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the present invention.

[0023] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0024] Figure 3 It is a schematic front view of the internal structure of the present invention.

[0025] Figure 4 It is a schematic diagram of the cutting member structure of the present invention.

[0026] Figure 5 It is a schematic diagram of the feeding mechanism structure of the present invention.

[0027] Figure 6 It is a schematic diagram of the control member structure of the present invention.

[0028] Figure 7 It is a schematic diagram of the partial structure of the control member of the present invention.

[0029] Figure 8 It is an exploded schematic diagram of the control member of the present invention.

[0030] Figure 9 is Figure 8Local structural schematic diagram at position A in [Chinese context].

[0031] In the figure, 1 is the frame; 11 is the lower non-woven fabric feeding roller; 12 is the upper non-woven fabric feeding roller; 13 is the rubber band feeding roller; 2 is the cutting member; 21 is the cutting motor; 22 is the driving rod; 23 is the cam; 24 is the cutting strip; 3 is the feeding replenishment mechanism; 31 is the feeding replenishment roller; 32 is the feeding replenishment motor; 33 is the upper cutting knife; 331 is the upper cutting knife bracket; 34 is the lower cutting knife; 341 is the lower cutting knife bracket; 35 is the control frame; 351 is the inner sliding groove; 352 is the outer sliding groove; 4 is the control member; 41 is the control rod; 411 is the jack; 412 is the limiting strip; 413 is the movable groove; 42 is the adjusting ring; 422 is the upper adjusting plate; 423 is the adjusting column; 4231 is the limiting groove; 424 is the lower adjusting plate; 43 is the rotating rod; 44 is the rotating ring; 441 is the through hole; 45 is the adjusting rod; 46 is the control motor; 5 is the push rod; 51 is the driving ball; 6 is the limiting member; 61 is the limiting rod; 62 is the limiting disk; 63 is the limiting seat; 7 is the pressing roller. Specific embodiments

[0032] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] Embodiment, as Figures 1 to 4As shown in the figure, a processing device for preventing the elastic waistband of a disposable diaper from retracting includes a frame 1, a lower non-woven fabric feeding roller 11, an upper non-woven fabric feeding roller 12, an elastic feeding roller 13, and a cutting member 2 disposed on the frame 1. The cutting member 2 includes a cutting motor 21, a driving rod 22, a cam 23, and a cutting strip 24. The cutting motor 21 is fixedly disposed on the frame 1, the driving end of the cutting motor 21 is fixedly connected to the driving rod 22, the cam 23 is fixedly connected to the driving rod 22, the cutting motor 21 drives the driving rod 22 to drive the cam 23 to rotate, and a cutting strip 24 is radially disposed on the protruding portion of the cam 23. A feeding mechanism 3 is further disposed on the frame 1. A pressing roller 7 is further disposed on the frame 1, and the pressing roller 7 is located on one side of the feeding mechanism 3 close to the upper non-woven fabric feeding roller 12. When the elastic in the elastic waistband of the disposable diaper is a complete single piece of elastic, the waistband will retract completely. At the same time, when one end of the waistband is disconnected, the entire waistband will retract back, resulting in the waistband becoming tight and affecting the comfort of the baby using the disposable diaper. Therefore, in the process of manufacturing the waistband of the present invention, a single piece of elastic is cut into sections. In this way, when the end of the elastic becomes loose, only a small section of the elastic will retract, which has little impact on the overall tightness of the waistband and can still be used. In the present invention, the cutting motor 21 drives the driving rod 22 to rotate, the driving rod 22 drives the cam 23 to rotate, and the protruding portion of the cam 23 drives the cutting strip to cut the elastic into sections. Since the upper and lower layers of the elastic are non-woven fabrics, the cutting strip cannot cut them off. Therefore, only the elastic between the upper and lower non-woven fabrics is cut off. Thus, the present invention solves the problem of the retraction of the elastic waistband.

[0034] When the elastic is cut off, the end of the cut-off elastic will retract appropriately, and during the retraction process, a retraction gap will appear between the upper and lower non-woven fabrics. At the same time, there are only the upper and lower non-woven fabrics at the cut end of the elastic, and the non-woven fabrics here are also subjected to a relatively large squeezing and cutting force, making them relatively fragile during subsequent use. The feeding mechanism 3 in the present invention can add a small section of connecting fabric above the elastic to be cut off. The presence of this fabric can not only prevent excessive retraction of the elastic, but also increase the thickness here, making the connection more stable.

[0035] Such as Figure 5 、 Figure 6As shown, the feeding mechanism 3 includes a feeding roller 31, a feeding motor 32, an upper cutter 33, a lower cutter 34, a control frame 35, and a control member 4. The control frame 35 is detachably arranged on the frame 1. The feeding roller 31 is rotatably connected to the frame 1. The driving end of the feeding motor 32 is fixedly connected to the feeding roller 31. Both the upper cutter 33 and the lower cutter 34 are slidably connected to the control frame 35. The control member 4 is arranged on the control frame 35, and the control member 4 drives the upper cutter 33 and the lower cutter 34 to approach or separate from each other. The feeding mechanism 3 in the present invention can achieve the effect of supplementing the fabric at the position where the rubber band is to be cut. The feeding motor 32 drives the feeding roller 31 to rotate. The feeding roller 31 is wound with the fabric. Then the fabric passes between the upper cutter 33 and the lower cutter 34 and then falls above the rubber band. Since there is glue between the rubber band and the lower non-woven fabric, the fabric will be driven to move under the action of the glue viscosity and the conveying force. After moving a certain distance, the control member 4 will control the upper cutter 33 and the lower cutter 34 to cut the fabric. Due to the guiding action of the side baffle of the lower cutter 34, the gravity of the fabric, and the conveying action of the feeding roller 31, the fabric can be continuously conveyed forward, so that the broken fabric can fall on the rubber band, and then under the appropriate pressure of the pressing roller 7, the supplemented fabric can be attached to the lower non-woven fabric and the rubber band.

[0036] As Figure 6 , Figure 7 shown, the control member 4 includes a control rod 41, an adjusting ring 42, a rotating rod 43, a rotating ring 44, an adjusting rod 45, and a control motor 46. The control motor 46 is arranged on the control frame 35. The control motor 46 drives the control rod 41 to rotate. The control rod 41 is rotatably connected to the control frame 35. The adjusting ring 42 is radially arranged on the control rod 41. The rotating ring 44 is radially movably connected below the control rod 41. A jack 411 is radially penetrated and opened at the lower end of the control rod 41. A through hole 441 coaxial with the jack 411 is opened on the rotating ring 44. The rotating rod 43 is radially movably and coaxially inserted into the jack 411 and the through hole 441. Both ends of the adjusting rod 45 are hinged to the rotating ring 44 and the adjusting ring 42 respectively.

[0037] As Figure 8As shown, upper cutter supports 331 are arranged on both sides of the upper cutter 33, lower cutter supports 341 are arranged on both sides of the lower cutter 34, inner sliding grooves 351 and outer sliding grooves 352 are arranged on both sides of the control frame 35, the upper cutter supports 331 are slidably arranged in the inner sliding grooves 351, the lower cutter supports 341 are slidably arranged in the outer sliding grooves 352, push rods 5 are arranged on the side of the upper cutter supports 331 and the lower cutter supports 341 close to the rotating ring 44, the two push rods 5 are perpendicular to the upper cutter supports 331 and the lower cutter supports 341 respectively, the upper cutter supports 331 and the lower cutter supports 341 are relatively movably clamped in the rotating ring 44, driving balls 51 are arranged at the ends of the push rods 5, and the driving balls 51 are movably clamped in the rotating ring 44.

[0038] As Figure 8 , Figure 9 As shown, a limiting member 6 is further arranged on the rotating rod 43. The limiting member 6 includes a limiting rod 61, a limiting disk 62, and a limiting seat 63. The limiting seat 63 is fixedly arranged above the control frame 35. The limiting rod 61 is provided with an external thread, the limiting seat 63 is provided with an internal thread, the limiting rod 61 is threadedly connected to the limiting seat 63, the limiting disk 62 is fixedly connected to the lower end of the limiting rod 61, the limiting disk 62 is movably clamped in the adjusting ring 42, a limiting strip 412 is axially arranged on the upper part of the control rod 41, a limiting groove 4231 is formed in the adjusting ring 42, and the adjusting ring 42 is slidably connected to the control rod 41 through the cooperation of the limiting groove 4231 and the limiting strip 412.

[0039] As Figure 9 As shown, the adjusting rod 45 includes an upper adjusting plate 422, an adjusting column 423, and a lower adjusting plate 424. The diameters of the upper adjusting plate 422 and the lower adjusting plate 424 are larger than the diameter of the adjusting column 423, and the limiting disk 62 is movably clamped between the upper adjusting plate 422 and the lower adjusting plate 424.

[0040] As Figures 7 - 9As shown, on the opposite sides of the control rod 41 in the axial direction, there are movable slots 413. The rotating rod 43 is inserted between the two movable slots 413 through the insertion holes 411, and the rotating ring 44 is arranged in the two movable slots 413. The control rod 41 drives the adjusting ring 42 and the rotating ring 44 to rotate. The adjusting ring 42 and the rotating ring 44 are connected by an adjusting rod 45. By adjusting the limiting rod 61, the limiting rod 61 drives the limiting disk 62 to move upward. Since the limiting disk 62 is clamped between the upper adjusting plate 422 and the lower adjusting plate 424 of the adjusting ring 42, and the adjusting ring 42 is slidably connected to the control rod 41, the limiting disk 62 drives the adjusting ring 42 to move upward. Since the length of the adjusting rod 45 is fixed, when the adjusting ring 42 moves upward, the distance between the adjusting ring 42 and the rotating ring 44 increases, causing the side of the rotating ring 44 connected to the adjusting rod 45 to tilt upward. The upper cutter support 331 is movably clamped on the rotating ring 44 through the push rod 5, and the upper cutter support 331 is slidably connected to the control frame 35. Therefore, when the adjusting ring 42 and the rotating ring 44 rotate synchronously, the rotating ring 44 floats up and down around the rotating rod 43, thereby driving the upper cutter support 331 to move up and down along the control frame 35. The lower cutter support 341 is the same as the upper cutter support 331. Since the upper cutter support 331 and the lower cutter support 341 are arranged oppositely, when the upper cutter support 331 moves upward, the lower cutter support 341 moves downward, achieving the effect of the upper cutter 33 and the lower cutter 34 cutting against each other.

Claims

1. A processing device for preventing the elastic waistband of a disposable diaper from shrinking, characterized in that: It includes a frame (1), a lower non-woven fabric feeding roller (11), an upper non-woven fabric feeding roller (12), an elastic band feeding roller (13), and a cutting member (2) arranged on the frame (1). The cutting member (2) includes a cutting motor (21), a driving rod (22), a cam (23), and a cutting strip (24). The cutting motor (21) is fixedly arranged on the frame (1), the driving end of the cutting motor (21) is fixedly connected to the driving rod (22), the cam (23) is fixedly connected to the driving rod (22), the cutting motor (21) drives the driving rod (22) to drive the cam (23) to rotate, and a cutting strip (24) is radially arranged on the protruding part of the cam (23). A feeding mechanism (3) is also arranged on the frame (1); the feeding mechanism (3) includes a feeding roller (31), a feeding motor (32), an upper cutter (33), a lower cutter (34), a control frame (35), and a control member (4). The control frame (35) is detachably arranged on the frame (1), the feeding roller (31) is rotatably connected to the frame (1), the driving end of the feeding motor (32) is fixedly connected to the feeding roller (31), the upper cutter (33) and the lower cutter (34) are both slidably connected to the control frame (35), the control member (4) is arranged on the control frame (35), and the control member (4) drives the upper cutter (33) and the lower cutter (34) to approach or separate from each other; the control member (4) includes a control rod (41), an adjusting ring (42), a rotating rod (43), a rotating ring (44), an adjusting rod (45), and a control motor (46). The control motor (46) is arranged on the control frame (35), the control motor (46) drives the control rod (41) to rotate, the control rod (41) is rotatably connected to the control frame (35), the adjusting ring (42) is radially arranged on the control rod (41), the rotating ring (44) is radially movably connected below the control rod (41), a jack (411) is radially penetrated and opened at the lower end of the control rod (41), a through hole (441) coaxial with the jack (411) is opened on the rotating ring (44), the rotating rod (43) is radially movably and coaxially inserted into the jack (411) and the through hole (441), and the two ends of the adjusting rod (45) are respectively hinged to the rotating ring (44) and the adjusting ring (42);A limiting member (6) is further provided on the rotating rod (43). The limiting member (6) includes a limiting rod (61), a limiting disc (62), and a limiting seat (63). The limiting seat (63) is fixedly provided above the control frame (35). The limiting rod (61) is provided with an external thread, and the limiting seat (63) is provided with an internal thread. The limiting rod (61) is threadedly connected to the limiting seat (63). The limiting disc (62) is fixedly connected to the lower end of the limiting rod (61). The limiting disc (62) is movably clamped in the adjusting ring (42). A limiting strip (412) is axially provided on the upper part of the control rod (41). A limiting groove (4231) is formed in the adjusting ring (42). The adjusting ring (42) is slidably connected to the control rod (41) through the cooperation of the limiting groove (4231) and the limiting strip (412).; 2. The processing device for preventing the elastic waistband of a disposable diaper from retracting according to claim 1, wherein: On both sides of the upper cutting knife (33), there are upper cutting knife brackets (331). On both sides of the lower cutting knife (34), there are lower cutting knife brackets (341). On both sides of the control frame (35), there are inner sliding grooves (351) and outer sliding grooves (352). The upper cutting knife brackets (331) are slidably arranged in the inner sliding grooves (351), and the lower cutting knife brackets (341) are slidably arranged in the outer sliding grooves (352). On the side of the upper cutting knife brackets (331) and the lower cutting knife brackets (341) close to the rotating ring (44), there are push rods (5). The two push rods (5) are perpendicular to the upper cutting knife brackets (331) and the lower cutting knife brackets (341) respectively. The upper cutting knife brackets (331) and the lower cutting knife brackets (341) are relatively movably clamped in the rotating ring (44).

3. The processing device for preventing the elastic waistband of a diaper from retracting according to claim 1, wherein: The adjusting ring (42) includes an upper adjusting plate (422), an adjusting column (423) and a lower adjusting plate (424). The diameters of the upper adjusting plate (422) and the lower adjusting plate (424) are larger than the diameter of the adjusting column (423). The limiting disc (62) is movably clamped between the upper adjusting plate (422) and the lower adjusting plate (424).

4. The processing device for preventing the elastic waistband of a diaper from shrinking according to claim 1, wherein: On the opposite sides of the control rod (41) in the axial direction, there are movable grooves (413). The rotating rod (43) is inserted between the two movable grooves (413) through the jack (411). The rotating ring (44) is arranged in the two movable grooves (413).

5. The processing device for preventing the elastic waistband of a diaper from shrinking according to claim 2, characterized in that: At the end of the push rod (5), there is a driving ball (51). The driving ball (51) is movably clamped in the rotating ring (44).

6. A processing device for preventing the elastic waistband of a diaper from shrinking according to claim 1, characterized in that: On the machine frame (1), there is also a pressure roller (7). The pressure roller (7) is located on the side of the feeding mechanism (3) close to the upper non-woven fabric feeding roller (12).

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