Novel air suction pulling device for underwear woven fabric

Abstract

The application discloses a novel air suction pulling device for underwear machine woven fabrics, and relates to the technical field of underwear machine weaving, which comprises a rack, a cloth winding drum is arranged on the rack, a half disc is arranged in the cloth winding drum, a discharging cylinder is arranged at the bottom of the cloth winding drum, a negative pressure traction device is connected to the bottom of the discharging cylinder, and the negative pressure traction device is used for generating negative pressure suction force to pull the fabric away from the cloth winding drum and the half disc; a lateral air guiding device is arranged on the inner wall of the discharging cylinder; wind power is generated by the negative pressure traction device to generate a pulling force on the fabric in the cloth winding drum, so that the fabric is discharged through the negative pressure traction device after passing through the discharging cylinder; and the lateral air guiding device provides horizontal suction force on the fabric entering the discharging cylinder, so as to avoid the fabric swinging and affecting the pulling force of the negative pressure traction device on the fabric in the cloth winding drum, and to ensure that the fabric can be uniformly stressed and discharged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of underwear weaving technology, in particular to a novel air suction pulling device for underwear fabric. BACKGROUND

[0002] Underwear refers to clothes worn next to the skin, which has the function of keeping warm, and the lightweight of knitted underwear products has become a trend. In seamless underwear circular knitting machines, the pulling mechanism adopts air suction type, and the suction force generated by the air suction machine is used to pull the fabric away from the loop area.

[0003] However, due to the small weight of lightweight fabric during knitting, the negative pressure suction force generated by the air suction machine cannot provide sufficient traction, making the fabric easy to float out of the pores of the needle cylinder and half needle disc, and the fabric loops are not enough to be de-looped, which can easily cause fabric defects or damage the knitting needle. Secondly, due to the different lengths of the fabric, the fabric does not receive enough traction, resulting in differences in the appearance of the fabric loops. The existing patent CN113737375B discloses a seamless underwear circular knitting machine and a method for controlling the pulling force of fabric, which is an inductive type. The device is provided with an induction device at the wall opening of the device, and the induction device is connected with the control system. When powered on, the sensor in the induction device can work, and the pulling force of the fabric during the knitting process can be collected in the first time, and the suction negative pressure can be changed in time to keep the pulling force of the fabric uniform.

[0004] However, the following problems still exist in the invention patent: the fabric will pass through the discharge port when subjected to the pulling force, and the fabric lacks restriction during the process of passing through the discharge port, which makes the fabric prone to swing at this point, thereby causing the connection between the discharge port and the cloth winding cylinder to be blocked by the fabric. The air force generated by the air suction motor is affected at this point, the wind direction and the pulling force on the fabric will change, thereby affecting the pulling effect on the fabric, and then affecting the weaving quality of the fabric. SUMMARY

[0005] The purpose of the present application is to provide a novel air suction pulling device for underwear fabric, which solves the technical problems raised in the background art.

[0006] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0007] The utility model provides a new type of air suction pulling device of underwear machine woven fabric, including frame, which is provided with the cloth winding drum, and the cloth winding drum is funnel -shaped, the cloth winding drum is provided with the half plate in, and the cloth winding drum and half plate are used for the fabric to weave, the bottom of cloth winding drum is provided with the discharge cylinder, the bottom of discharge cylinder is connected with negative pressure traction device, and the negative pressure traction device is used to produce negative pressure suction force to pull the fabric and separate from cloth winding drum and half plate, and the fabric is discharged after the discharge cylinder and negative pressure traction device, the inner wall of discharge cylinder is provided with lateral air guide device, and the lateral air guide device is used to provide horizontal direction lateral suction force.

[0008] As a preferred scheme of the utility model, the lateral air guide device includes a ring pipe arranged on the outer wall of the discharge cylinder, a plurality of air guide plates uniformly distributed around the center line of the discharge cylinder are arranged on the outer wall of the ring pipe and the side wall of the discharge cylinder, the ring pipe is communicated with the inside of the discharge cylinder through the plurality of air guide plates, the plurality of air guide plates are connected with an adjusting assembly, the adjusting assembly is used to adjust the size of the channel on the air guide plate communicated with the ring pipe and the discharge cylinder, a plurality of air tubes corresponding to the air guide plates are arranged in the ring pipe, and the plurality of air tubes are connected with a first air pump.

[0009] As a preferred scheme of the utility model, the air guide plate includes a fixed plate, the ring pipe and the discharge cylinder are provided with mutually aligned mounting grooves, the fixed plate is arranged in the mounting grooves on the ring pipe and the discharge cylinder and flush with the inner wall of the ring pipe, a plurality of air guide holes are arranged on the fixed plate, a sealing plate is slidably connected to the side of the fixed plate facing the inside of the ring pipe, the sealing plate is connected with the adjusting assembly, and a plurality of adjusting holes corresponding to the plurality of air guide holes are arranged on the sealing plate.

[0010] As a preferred scheme of the utility model, the adjusting assembly includes an outer gear ring fixedly connected to the outer wall of the plurality of sealing plates, a gear is engaged with the outer gear ring, the gear is installed on the inner side wall of the ring pipe through a rotating shaft, and the rotating shaft is connected with a driving device.

[0011] As a preferred scheme of the utility model, a positioning convex plate is arranged on the side wall of the ring pipe close to the discharge cylinder, two positioning blocks are arranged on the bottom of the outer gear ring, and the positioning convex plate is located between the two positioning blocks.

[0012] When one of the positioning blocks abuts against the positioning convex plate, the plurality of air guide holes are aligned with the plurality of adjusting holes, and when the other positioning block abuts against the positioning convex plate, the sealing plate closes the plurality of air guide holes.

[0013] As a preferred scheme of the present application, the wind guide hole is inclined upward on the fixing plate, the adjusting hole is arranged horizontally on the sealing plate, and the center of one end of each wind guide hole can coincide with the center of one end of the corresponding adjusting hole.

[0014] As a preferred scheme of the present application, the inner wall of the discharging cylinder is further provided with an auxiliary discharging device, the auxiliary discharging device is used for assisting the fabric to separate from the cloth winding cylinder and the half disc, the auxiliary discharging device comprises a plurality of connecting shafts rotatably arranged on the inner side wall of the discharging cylinder and an annular seat fixedly arranged on the outer wall of the discharging cylinder, the plurality of connecting shafts are uniformly distributed around the center line of the discharging cylinder, a plurality of elastic sheets are uniformly arranged around the axis of each connecting shaft, a side groove for mounting the plurality of connecting shafts is arranged on the inner side wall of the discharging cylinder, an annular groove in communication with the plurality of side grooves is arranged on the annular seat, the height of the inner bottom of the annular groove is less than the height of the inner bottom of the side groove, the height of the inner top of the annular groove is greater than the height of the inner top of the side groove, and a plurality of air blowing pipes are arranged in the annular groove, the plurality of air blowing pipes are commonly connected with a second air pump, and a plurality of air outlet grooves in communication with the outside of the annular seat are arranged on the inner top of the annular groove corresponding to the plurality of air blowing pipes.

[0015] As a preferred scheme of the present application, the edges of the elastic sheets are provided with circular arc chamfers.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The present application generates wind force through the negative pressure traction device to generate traction force on the fabric in the cloth winding cylinder, so that the fabric is discharged through the discharging cylinder and the negative pressure traction device, and the lateral wind guide device provides horizontal suction force on the fabric entering the discharging cylinder, thereby avoiding the fabric from swinging and affecting the traction force of the negative pressure traction device on the fabric in the cloth winding cylinder, so as to ensure that the fabric can be uniformly stressed and discharged. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be obtained on the basis of the provided drawings without creative labor.

[0019] Figure 1 A schematic diagram of the overall structure of a new type of air suction traction device for underwear machine fabric is provided for the embodiments of the present application.

[0020] Figure 2 A schematic diagram of the partial cross-sectional structure of a first perspective view of a new type of air suction traction device for underwear machine fabric is provided for the embodiments of the present application.

[0021] Figure 3 A second view of a partial sectional view structure schematic diagram of a new type of air suction pulling device of an underwear machine fabric is provided for the embodiment of the present application;

[0022] Figure 4 A partial structure schematic diagram of a new type of air suction pulling device of an underwear machine fabric is provided for the embodiment of the present application;

[0023] Figure 5 A structure enlarged schematic diagram of the A part shown in Figure 2

[0024] Figure 6 A structure enlarged schematic diagram of the B part shown in Figure 2

[0025] Figure 7 A structure enlarged schematic diagram of the C part shown in Figure 4

[0026] Figure 8 A structure enlarged schematic diagram of the D part shown in Figure 3 The numbers in the figures respectively represent as follows:

[0027] 1, machine frame; 2, cloth winding cylinder; 3, half disc; 4, discharging cylinder; 5, negative pressure pulling device; 6, lateral air guiding device; 7, auxiliary discharging device;

[0028] 601, annular tube; 602, air guiding plate; 603, air pipe; 604, adjusting assembly; 605, fixed plate; 606, air guiding hole; 607, sealing plate; 608, adjusting hole; 609, outer tooth ring; 610, gear; 611, positioning convex plate; 612, positioning block; 701, connecting shaft; 702, elastic sheet; 703, side slot; 704, annular slot; 705, air blowing pipe; 706, air outlet slot; 707, annular seat.

[0029] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0030] As

[0031] Figures 1 to 8 ​​​​As shown, the present application provides a new type of air suction pulling device for underwear machine fabric, which comprises a rack 1, a cloth winding drum 2 is arranged on the rack 1, and the cloth winding drum 2 is funnel-shaped, a half disc 3 is arranged in the cloth winding drum 2, and the cloth winding drum 2 and the half disc 3 are used for fabric weaving, a discharge cylinder 4 is arranged at the bottom of the cloth winding drum 2, a negative pressure traction device 5 is connected at the bottom of the discharge cylinder 4, and the negative pressure traction device 5 is used to generate negative pressure suction force to pull the fabric away from the cloth winding drum 2 and the half disc 3, and the fabric is discharged after passing through the discharge cylinder 4 and the negative pressure traction device 5, a lateral air guiding device 6 is arranged on the inner wall of the discharge cylinder 4, and the lateral air guiding device 6 is used to provide horizontal lateral suction force.

[0032] In actual application, the half disc 3 and the cloth winding drum 2 do not have a connection relationship (for details, refer to the invention patent with patent publication number CN113737375B, a seamless underwear circular machine and a method for controlling fabric pulling force), and both are located inside the underwear circular machine, and the underwear circular machine (not shown in the drawing) is a prior art, and its technical principle is not described in detail, the rack 1 is a support inside the underwear circular machine for installing the half disc 3 and the cloth winding drum 2, and its shape in the drawing is only an example, the fabric is woven in the half disc 3 and the cloth winding drum 2, and is adsorbed and pressed downward by the negative pressure suction force generated by the negative pressure traction device 5.

[0033] During weaving, the negative pressure traction device 5 generates negative pressure suction force to provide pulling force to the fabric, pulls the fabric into the discharge cylinder 4, and then into the negative pressure traction device 5 through the discharge cylinder 4, and then discharges from the negative pressure traction device 5.

[0034] In this embodiment, the specific structure and principle of the negative pressure traction device 5 refer to the invention patent with patent publication number CN113737375B, a seamless underwear circular machine and a method for controlling fabric pulling force, and specifically refer to the pulling device, fabric conveying pipeline, discharge horn and discharge cover in the invention patent (CN113737375B), and the negative pressure traction device 5 in this application is a collection of the above-mentioned structures (pulling device, fabric conveying pipeline, discharge horn and discharge cover) listed in the invention patent (CN113737375B), and the technical principle of the negative pressure traction device 5 is not described in detail.

[0035] After the fabric is pulled into the discharge cylinder 4 by the negative pressure traction device 5, the lateral air guiding device 6 provides horizontal lateral suction force, so that the fabric is uniformly stressed in the horizontal direction during passing through the discharge cylinder 4, and the fabric is uniformly stressed when pulled by the negative pressure traction device 5, which ensures the weaving quality of the fabric and avoids the fabric from swinging after entering the discharge cylinder 4, thereby affecting the pulling effect of the negative pressure traction device 5 on the fabric in the half disc 3.

[0036] Further, the inductive device is arranged on the cloth beam 2 and the half disc 3, and is used for sensing the pulling force of the fabric in the weaving process. For details, refer to the inductive seamless underwear circular machine and the method for controlling the fabric pulling force disclosed in the patent with the publication number CN113737375B.

[0037] The lateral air guide device 6 includes an annular pipe 601 arranged on the outer wall of the discharge cylinder 4, and a plurality of air guide plates 602 are uniformly distributed around the center line of the discharge cylinder 4 and arranged on the outer wall of the annular pipe 601 and the side wall of the discharge cylinder 4. The annular pipe 601 is in communication with the inside of the discharge cylinder 4 through the plurality of air guide plates 602, and the plurality of air guide plates 602 are connected with an adjusting assembly 604, and the adjusting assembly 604 is used for adjusting the size of the passage on the air guide plate 602 which communicates the annular pipe 601 and the discharge cylinder 4. The inside of the annular pipe 601 is provided with a plurality of air tubes 603 corresponding to the air guide plates 602, and the plurality of air tubes 603 are connected with a first air pump.

[0038] The first air pump is started to suck the plurality of air tubes 603, so as to generate a negative pressure suction force in the annular pipe 601, and the negative pressure suction effect is generated on the fabric in the discharge cylinder 4 through the passage on the plurality of air guide plates 602. Due to the uniform distribution of the air guide plates 602, the horizontal suction force on the fabric is uniformly distributed, so that the fabric is kept stable under the action of the negative pressure suction force, and the pulling force distribution of the negative pressure traction device 5 on the fabric in the cloth beam 2 is uniform, so as to avoid that the fabric is blocked from the passage between the discharge cylinder 4 and the cloth beam 2.

[0039] The size of the passage on the air guide plate 602 is adjusted through the adjusting assembly 604, so as to adjust the size of the suction force in the discharge cylinder 4, and the size of the suction force is adjusted according to the fabric with different parameters such as different materials and different weights, so as to ensure the stability of the fabric in the discharging process.

[0040] The air guide plate 602 includes a fixed plate 605, and the annular pipe 601 and the discharge cylinder 4 are jointly provided with mutually aligned mounting grooves, and the fixed plate 605 is arranged in the mounting grooves on the annular pipe 601 and the discharge cylinder 4 and is flush with the inner wall of the annular pipe 601. A plurality of air guide holes 606 are arranged on the fixed plate 605, and a sealing plate 607 is slidably connected to one side of the fixed plate 605 which faces the inside of the annular pipe 601, and the sealing plate 607 is connected with the adjusting assembly 604. A plurality of adjusting holes 608 corresponding to the plurality of air guide holes 606 are arranged on the sealing plate 607.

[0041] The adjusting assembly 604 drives the plurality of sealing plates 607 to slide on the corresponding fixed plates 605, so as to adjust the relative positions between the adjusting holes 608 and the corresponding air guide holes 606, so that the size of the communication part between the adjusting holes 608 and the air guide holes 606 is increased or decreased, so as to change the sectional area of the path through which the air flows, thereby adjusting the size of the fabric adsorption force.

[0042] The fixed plates 605 are flush with the inner wall of the annular pipe 601, so as to ensure that the sealing plates 607 can normally slide and avoid interference with the inner wall of the annular pipe 601.

[0043] Further, one side of the fixed plate 605 can also extend into the inside of the annular pipe 601, as long as the inner wall of the annular pipe 601 does not interfere with the movement of the sealing plate 607.

[0044] The adjusting assembly 604 includes an outer tooth ring 609 fixedly connected to the outer wall of the plurality of sealing plates 607, the outer tooth ring 609 is engaged with a gear 610, and the gear 610 is installed on the inner side wall of the annular pipe 601 through a rotating shaft, and the rotating shaft is connected with a driving device.

[0045] The driving device such as a motor drives the rotating shaft to drive the gear 610 to rotate, thereby driving the outer tooth ring 609 to rotate, and the plurality of sealing plates 607 synchronously rotate with the outer tooth ring 609, so as to adjust the relative positions between the sealing plates 607 and the fixed plates 605, and then adjust the size of the communication part between the adjusting holes 608 and the air guide holes 606.

[0046] The inner wall of the annular pipe 601 near the discharge cylinder 4 is provided with a positioning lug 611, and the bottom of the outer tooth ring 609 is provided with two positioning blocks 612, and the positioning lug 611 is located between the two positioning blocks 612.

[0047] When one of the positioning blocks 612 abuts against the positioning lug 611, the plurality of air guide holes 606 are aligned with the plurality of adjusting holes 608, and when the other positioning block 612 abuts against the positioning lug 611, the sealing plates 607 close the plurality of air guide holes 606.

[0048] The movement range of the positioning lug 611 is limited by the two positioning blocks 612, so that when the adjusting assembly 604 adjusts the positions of the sealing plates 607, the sealing plates 607 can accurately close the air guide holes 606 or make the air guide holes 606 and the adjusting holes 608 completely aligned, which not only adjusts more accurately, but also has the shortest stroke to achieve the effect of adjusting the size of the fabric negative pressure adsorption force.

[0049] The air guide holes 606 are obliquely upwardly formed in the fixed plates 605, and the adjusting holes 608 are arranged in the sealing plates 607 along the horizontal direction, and the center of one end of each air guide hole 606 can coincide with the center of one end of the corresponding adjusting hole 608.

[0050] The negative pressure suction force generated by the first air pump can have a downward pulling effect on the fabric, assisting the negative pressure traction device 5 in pulling the fabric and improving efficiency.

[0051] The inner wall of the discharge cylinder 4 is also provided with an auxiliary discharging device 7, and the auxiliary discharging device 7 is used to assist the fabric to separate from the beaming cylinder 2 and the half disc 3. The auxiliary discharging device 7 includes a plurality of connecting shafts 701 rotatably arranged on the inner side wall of the discharge cylinder 4 and an annular seat 707 fixedly arranged on the outer wall of the discharge cylinder 4, and the plurality of connecting shafts 701 are uniformly distributed around the center line of the discharge cylinder 4. A plurality of elastic sheets 702 are uniformly arranged on each connecting shaft 701 around the axis. A side groove 703 for installing the plurality of connecting shafts 701 is formed on the inner side wall of the discharge cylinder 4. An annular groove 704 is formed on the annular seat 707 and communicates with the plurality of side grooves 703. The height of the inner bottom of the annular groove 704 is less than that of the inner bottom of the side groove 703. The height of the inner top of the annular groove 704 is greater than that of the inner top of the side groove 703. A plurality of blow pipes 705 are arranged in the annular groove 704, and the plurality of blow pipes 705 are connected with a second air pump. A plurality of air outlet grooves 706 are arranged on the inner top of the annular groove 704 and communicate with the outside of the annular seat 707.

[0052] The second air pump is started, and the elastic sheets 702 on the connecting shafts 701 are blown by the plurality of blow pipes 705, so that the connecting shafts 701 rotate, and the elastic sheets 702 on the connecting shafts 701 are in contact with the fabric in a cycle, and a downward force is generated on the fabric to assist the fabric to be discharged.

[0053] By arranging the air outlet grooves 706 on the inner top of the annular groove 704 and arranging the blow pipes 705 on the inner bottom of the annular groove 704, the gas blown by the blow pipes 705 directly enters the outside of the annular seat 707 through the air outlet grooves 706 when the connecting shafts 701 are rotated by the blow pipes 705, avoiding the upward force on the fabric inside the discharge cylinder 4, and ensuring the stability of the fabric.

[0054] Further, the height of the auxiliary discharging device 7 arranged in the discharge cylinder 4 should be low. When the fabric is contacted by the auxiliary discharging device 7, the top of the fabric should be at the top of the discharge cylinder 4 and be about to leave the beaming cylinder 2.

[0055] The edges of the elastic sheets 702 are provided with circular arc chamfers to avoid damaging the fabric.

[0056] The above examples are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also considered to fall within the protection scope of the present application.

Claims

1. A suction-pulling device for a knitted fabric of an undergarment, comprising a frame (1), characterized in that, The rack (1) is provided with a cloth winding cylinder (2), and the cloth winding cylinder (2) is funnel-shaped, the cloth winding cylinder (2) is provided with a half disc (3), and the cloth winding cylinder (2) and the half disc (3) are used for fabric weaving, the bottom of the cloth winding cylinder (2) is provided with a discharge cylinder (4), the bottom of the discharge cylinder (4) is connected with a negative pressure traction device (5), and the negative pressure traction device (5) is used to generate negative pressure suction force to separate the fabric from the cloth winding cylinder (2) and the half disc (3), and the fabric is discharged after passing through the discharge cylinder (4) and the negative pressure traction device (5), the inner wall of the discharge cylinder (4) is provided with a lateral air guide device (6), and the lateral air guide device (6) is used to provide horizontal lateral suction force; The lateral air guide device (6) comprises an annular pipe (601) arranged on the outer wall of the discharge cylinder (4), a plurality of air guide plates (602) uniformly distributed around the center line of the discharge cylinder (4) are arranged on the outer wall of the annular pipe (601) and the side wall of the discharge cylinder (4), and the annular pipe (601) is in communication with the inside of the discharge cylinder (4) through the plurality of air guide plates (602), a plurality of air guide plates (602) are connected with an adjusting assembly (604), and the adjusting assembly (604) is used to adjust the size of the channel of the air guide plate (602) connected with the annular pipe (601) and the discharge cylinder (4), a plurality of air pipes (603) corresponding to the air guide plates (602) are arranged in the annular pipe (601), and a first air pump is connected with the plurality of air pipes (603); The air guide plate (602) comprises a fixed plate (605), the annular pipe (601) and the discharge cylinder (4) are provided with mutually aligned mounting grooves, and the fixed plate (605) is arranged in the mounting grooves on the annular pipe (601) and the discharge cylinder (4) and flush with the inner wall of the annular pipe (601), a plurality of air guide holes (606) are arranged on the fixed plate (605), and a sealing plate (607) is slidably connected to one side of the fixed plate (605) facing the inside of the annular pipe (601), and the sealing plate (607) is connected with the adjusting assembly (604), a plurality of adjusting holes (608) corresponding to the plurality of air guide holes (606) are arranged on the sealing plate (607); The inner wall of the discharge cylinder (4) is further provided with an auxiliary discharging device (7), which is used for assisting the fabric to separate from the beaming cylinder (2) and the Haff disc (3), and the auxiliary discharging device (7) comprises a plurality of connecting shafts (701) rotatably arranged on the inner side wall of the discharge cylinder (4) and an annular seat (707) fixedly arranged on the outer wall of the discharge cylinder (4), and the plurality of connecting shafts (701) are uniformly distributed around the center line of the discharge cylinder (4), a plurality of elastic sheets (702) are uniformly arranged on each connecting shaft (701) around the axis, a side groove (703) for mounting the plurality of connecting shafts (701) is formed in the inner side wall of the discharge cylinder (4), an annular groove (704) in communication with the plurality of side grooves (703) is formed in the annular seat (707), the height of the inner bottom of the annular groove (704) is less than that of the side groove (703), the height of the inner top of the annular groove (704) is greater than that of the side groove (703), a plurality of blow pipes (705) are arranged in the annular groove (704), and the plurality of blow pipes (705) are commonly connected with a second air pump, and a plurality of air outlet grooves (706) in communication with the outside of the annular seat (707) are arranged on the inner top of the annular groove (704) corresponding to the plurality of blow pipes (705).

2. An air suction pulling device for a knitted fabric of an undergarment according to claim 1, wherein The adjusting assembly (604) comprises an outer gear ring (609) fixedly connected to the outer wall of the plurality of sealing plates (607), the outer gear ring (609) is engaged with a gear (610), and the gear (610) is mounted on the inner side wall of the annular pipe (601) through a rotating shaft, and the rotating shaft is connected with a driving device.

3. An air suction pulling device for a knitted fabric of an undergarment according to claim 2, characterized in that, The annular pipe (601) is provided with a positioning lug (611) on the side wall close to the discharge cylinder (4), the bottom of the outer gear ring (609) is provided with two positioning blocks (612), and the positioning lug (611) is located between the two positioning blocks (612). When one of the positioning blocks (612) abuts against the positioning lug (611), the plurality of air guide holes (606) are aligned with the plurality of adjusting holes (608), and when the other positioning block (612) abuts against the positioning lug (611), the sealing plate (607) closes the plurality of air guide holes (606).

4. An air suction pulling device for a knitted fabric of an undergarment according to claim 1, wherein The air guide hole (606) is obliquely upwardly formed in the fixed plate (605), the adjusting hole (608) is arranged on the sealing plate (607) in the horizontal direction, and the center of one end of each air guide hole (606) can coincide with the center of one end of the corresponding adjusting hole (608).

5. An air suction pulling device for a knitted fabric of an undergarment according to claim 1, wherein The edges of the elastic sheets (702) are all provided with circular arc chamfers.

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