Protective device of circular knitting machine for preparing knitted fabric

Abstract

The utility model belongs to the technical field of textile equipment, and particularly relates to a protective device of a circular knitting machine for preparing knitted fabric, which comprises a cover body, a circular knitting machine is arranged in the cover body, and a protective door is movably arranged on the outer wall of the cover body; the dust removal assembly is arranged on the outer side of the cover body and communicates with the top of the cover body, the dust removal assembly comprises a connecting pipeline, the connecting pipeline communicates with the top of the cover body, an air outlet pipe and a fan are arranged on the outer wall of the connecting pipeline in a communicating mode, and the fan is arranged in the air outlet pipe; a first filter screen and a cleaning structure are arranged between the air outlet pipe and the connecting pipeline, and the cleaning structure is movably arranged in the connecting pipeline and used for cleaning the surface of the first filter screen; wherein an air inlet is formed in the outer wall of the cover body, and a plurality of wire inlet holes are evenly distributed in the outer wall of the cover body in the circumferential direction. And the effects of conveniently cleaning the first filter screen and reducing the labor intensity of operators are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of textile equipment, and in particular relates to a protective device of a circular knitting machine for preparing knitted fabrics. Background Art

[0002] Knitted fabrics are made by bending yarns into loops and interlacing them with knitting needles. The difference between knitted fabrics and woven fabrics is the different forms of yarns in the fabrics. Knitting is divided into weft knitting. Knitted fabrics are widely used in clothing fabrics, linings, home textiles and other products. Among them, super soft knitted fabrics are popular among consumers.

[0003] Chinese utility model patent CN214992196U discloses a protective cover for a large circular knitting machine, including a cover body which wraps the large circular knitting machine and is open on the top, a cover top is fixed on the top of the cover body, a thread hole for thread passing through is reserved between the cover top and the cover body, a plurality of support columns located in the thread holes are fixed on the upper end surface of the cover body, the top ends of the support columns are fixed to the lower end surface of the cover top, an access door is provided on one side of the cover body, a plurality of observation ports are opened on the circumferential side wall of the cover body, and a plurality of transparent plates which close the observation ports are fixedly embedded in the observation ports.

[0004] However, when the device extracts air from the cover body through the fan, in order to ensure the filtering efficiency of the first filter screen, the operator needs to frequently open the cleaning door for cleaning, which increases the labor intensity of the operator. Utility Model Content

[0005] The purpose of the utility model is to provide a protective device for a circular knitting machine for preparing knitted fabrics in view of the above-mentioned technical problems, so as to achieve the effect of solving the problems raised in the background technology.

[0006] In view of this, the utility model provides a protective device for a circular knitting machine for preparing knitted fabrics, which is characterized by comprising:

[0007] A cover body, wherein a large circular knitting machine is arranged inside the cover body, and a protective door is movably arranged on the outer wall of the cover body;

[0008] A dust removal component is arranged outside the cover body and is connected to the top of the cover body. The dust removal component includes:

[0009] A connecting pipe is connected to the top of the cover body, and an air outlet pipe is connected to the outer wall of the connecting pipe.

[0010] A fan is arranged in the air outlet pipe, and a first filter is arranged between the air outlet pipe and the connecting pipe.

[0011] A cleaning structure, the cleaning structure is movably disposed in the connecting pipe and is used to clean the surface of the first filter screen;

[0012] Wherein, an air inlet is arranged on the outer wall of the cover body, and a plurality of wire inlet holes are evenly distributed on the outer wall of the cover body.

[0013] In this technical solution, the external yarn enters the cover through the inlet hole, so that the circular knitting machine processes it. The cooperation between the cover and the protective door can improve the safety of the circular knitting machine during operation. The cooperation between the connecting pipe, the air outlet pipe, the fan, the first filter, and the air inlet can collect the fluff generated by the circular knitting machine during operation, which is beneficial to improving the quality of the circular knitting machine processing. The first filter can be cleaned by the movable cleaning structure, which is beneficial to improving the filtering efficiency of the first filter and reducing the labor intensity of the operator.

[0014] In the above technical solution, further, the cleaning structure includes:

[0015] A lifting groove, wherein the lifting groove is symmetrically arranged on the inner wall of the connecting pipe, and a lifting screw rod is rotatably arranged in the lifting groove on one side, and a polished rod is arranged in the lifting groove on the other side;

[0016] A slider, wherein the slider is slidably disposed in the lifting groove, and the slider is threadedly connected to the lifting screw rod;

[0017] A brush, wherein the brush is disposed between the two sliders, and an end surface of the brush contacts the surface of the first filter screen;

[0018] The driving structure is arranged above the lifting slot and is used to drive the lifting screw to rotate.

[0019] In the present technical solution, the driving structure drives the lifting screw to rotate, thereby driving the slider to move back and forth up and down along the lifting groove. The first filter can be cleaned by the brush arranged between the sliders, which is beneficial to improving the filtering efficiency of the first filter.

[0020] In the above technical solution, further, the driving structure includes:

[0021] An air avoidance groove, the air avoidance groove is arranged above the lifting groove;

[0022] A driving motor, wherein the driving motor is arranged on the outer wall of the connecting pipe, and the output shaft passes through the side wall of the connecting pipe;

[0023] A first bevel gear, which is rotatably disposed in the clearance groove and connected to an output shaft of the driving motor;

[0024] The second bevel gear is meshed with the first bevel gear and connected to the top end of the lifting screw.

[0025] In the present technical solution, the first bevel gear can be driven to rotate by a driving motor, thereby driving the second bevel gear and the lifting screw to rotate, and the up and down movement of the slider in the lifting slot is adjusted by controlling the forward and reverse rotation of the driving motor.

[0026] In the above technical solution, further, a collecting structure is provided below the first filter screen, and the collecting structure is used to collect the cleaned fluff.

[0027] In the above technical solution, further, the collection structure includes:

[0028] A collecting box, which is arranged at the bottom of the connecting pipe and has a feed inlet on the top surface;

[0029] The opening is formed on the side wall of the collecting box, and a sealing door is hingedly provided at the opening.

[0030] In the present technical solution, the fluff cleaned by the cleaning structure can fall into the collecting box through the feed port. After a certain amount of fluff is collected in the collecting box, the sealed door can be opened and the fluff in the collecting box can be cleaned through the opening, which facilitates the cleaning of the fluff and is beneficial to improving production efficiency and quality.

[0031] In the above technical solution, further, a compression structure is provided inside the collection box, and the compression structure includes:

[0032] A movable plate, the movable plate is hingedly arranged at the feed inlet to control the opening and closing of the feed inlet;

[0033] A squeezing plate, which is movably arranged in the collecting box and is arranged in an L shape;

[0034] A telescopic cylinder, wherein the telescopic cylinder is arranged in the collecting box and an output shaft thereof is connected to the extrusion plate;

[0035] Wherein, the L-shaped side of the extrusion plate is in contact with the top surface of the collection box.

[0036] In the technical solution, when the telescopic cylinder does not push the extrusion plate to move, the movable plate is in an inclined state, so that the cleaned fluff can enter the collection box through the feed inlet, and the telescopic cylinder pushes the extrusion plate to move. During the movement of the extrusion plate, the movable plate can be pushed to rotate upward to close the feed inlet and prevent the fluff from falling into the cavity between the extrusion plate and the telescopic cylinder. Through the cooperation between the sealing door and the extrusion plate, the fluff can be compressed, which is beneficial to increase the collection capacity of the collection box.

[0037] In the above technical solution, further, the length of the contact edge between the extrusion plate and the top surface of the collecting box is greater than the distance between the sealing door and the feed port.

[0038] In the present technical solution, by making the length of the fitting edge between the extrusion plate and the top surface of the collection box greater than the distance between the sealing door and the feed port, it is possible to prevent the movable plate from rotating downward when the extrusion plate is extruding the fluff, causing the extrusion plate to be unable to be retracted normally, which is beneficial to improving the stability of the device.

[0039] In the above technical solution, further, a transparent window is provided on the protective door.

[0040] In the technical solution, the transparent window enables the operator to observe the large circular knitting machine conveniently, which greatly reduces the probability of the observing personnel being injured when the large circular knitting machine fails, thereby improving the safety of personnel.

[0041] In the above technical solution, further, the air inlet is located below the wire inlet hole, and a second filter is provided in the air inlet.

[0042] In the present technical solution, the air inlet is set below the wire inlet hole. When the fan draws air, air enters from the air inlet, causing an upward airflow in the cover body, thereby improving the collection efficiency of lint on the yarn. In addition, by setting up a second filter, impurities on the outside of the cover body can be prevented from entering the cover body, which is beneficial to improving the quality of fabric preparation.

[0043] The beneficial effects of the utility model are:

[0044] 1. The cooperation between the cover and the protective door can improve the safety of the circular knitting machine during operation. The cooperation between the connecting pipe, the air outlet pipe, the fan, the first filter and the air inlet can collect the fluff generated by the circular knitting machine during operation, which is beneficial to improving the quality of the circular knitting machine processing. The first filter can be cleaned by the movable cleaning structure, which is beneficial to improving the filtering efficiency of the first filter and reducing the labor intensity of the operator.

[0045] 2. The fluff cleaned by the cleaning structure can fall into the collection box through the feed port. After a certain amount of fluff is collected in the collection box, the sealing door can be opened and the fluff in the collection box can be cleaned through the opening, which is convenient for cleaning the fluff and is beneficial to improving production efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a three-dimensional diagram of the utility model;

[0047] Figure 2 It is a three-dimensional cross-sectional view of the utility model;

[0048] Figure 3 It is a cross-sectional view of the dust removal component in the utility model;

[0049] Figure 4 This utility model Figure 3 A magnified image of area A;

[0050] The symbols in the figure are:

[0051] 1. Cover body; 2. Protection door; 3. Dust removal assembly; 301. Connecting pipe; 302. Air outlet pipe; 303. Fan; 304. First filter; 4. Air inlet; 5. Wire inlet; 6. Cleaning structure; 601. Lifting slot; 602. Lifting screw rod; 603. Sliding block; 604. Brush; 7. Driving structure; 701. Air avoidance slot; 702. First bevel gear; 703. Second bevel gear; 8. Collecting structure; 801. Collecting box; 802. Feeding port; 803. Opening; 804. Sealing door; 9. Compression structure; 901. Movable plate; 902. Extrusion plate; 903. Telescopic cylinder; 10. Second filter; 11. Transparent window. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0053] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0055] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0056] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0057] Embodiment 1:

[0058] Depend on Figure 1-Figure 4As shown, the present embodiment provides a protective device for a large circular knitting machine for preparing knitted fabrics, comprising: a cover body 1, wherein a large circular knitting machine is arranged inside the cover body 1, and a protective door 2 is movably arranged on the outer wall of the cover body 1; a dust removal component 3, wherein the dust removal component 3 is arranged on the outer side of the cover body 1 and is connected to the top of the cover body 1, and the dust removal component 3 comprises: a connecting pipe 301, wherein the connecting pipe 301 is connected to the top of the cover body 1, and an air outlet pipe 302 is connected to the outer wall of the connecting pipe 301, a fan 303, wherein the fan 303 is arranged in the air outlet pipe 302, and a first filter screen 304 is arranged between the air outlet pipe 302 and the connecting pipe 301, and a cleaning structure 6, wherein the cleaning structure 6 is movably arranged in the connecting pipe 301, and is used to clean the surface of the first filter screen 304; wherein, an air inlet 4 is arranged on the outer wall of the cover body 1, and a plurality of wire inlet holes 5 are evenly distributed circumferentially on the outer wall of the cover body 1.

[0059] The external yarn enters the cover body 1 through the wire inlet hole 5, so that the circular knitting machine processes it. The cooperation between the cover body 1 and the protective door 2 can improve the safety of the circular knitting machine during operation. The cooperation between the connecting pipe 301, the air outlet pipe 302, the fan 303, the first filter screen 304, and the air inlet 4 can collect the fluff generated by the circular knitting machine during operation, which is beneficial to improving the quality of the circular knitting machine processing. The first filter screen 304 can be cleaned by the movable cleaning structure 6, which is beneficial to improving the filtering efficiency of the first filter screen 304 and reducing the labor intensity of the operator.

[0060] Furthermore, the cleaning structure 6 includes: a lifting groove 601, which is symmetrically arranged on the inner wall of the connecting pipe 301, and a lifting screw 602 is rotatably arranged in the lifting groove 601 on one side, and a light rod is arranged in the lifting groove 601 on the other side; a slider 603, which is slidably arranged in the lifting groove 601, and the slider 603 and the lifting screw 602 are threadedly connected; a brush 604, which is arranged between the two sliders 603, and the end face of the brush 604 is in contact with the surface of the first filter 304; a driving structure 7, which is arranged above the lifting groove 601 to drive the lifting screw 602 to rotate.

[0061] The lifting screw rod 602 is driven to rotate by the driving structure 7, thereby driving the slider 603 to move up and down along the lifting slot 601. The first filter screen 304 can be cleaned by the brush 604 arranged between the sliders 603, which is beneficial to improving the filtering efficiency of the first filter screen 304.

[0062] Furthermore, the driving structure 7 includes: an air avoidance groove 701, which is arranged above the lifting groove 601; a driving motor, which is arranged on the outer wall of the connecting pipe 301, and the output shaft passes through the side wall of the connecting pipe 301; a first bevel gear 702, which is rotatably arranged in the air avoidance groove 701 and is connected to the output shaft of the driving motor; a second bevel gear 703, which is meshed with the first bevel gear 702 and is connected to the top of the lifting screw 602.

[0063] The first bevel gear 702 can be driven to rotate by the driving motor, thereby driving the second bevel gear 703 and the lifting screw 602 to rotate. The up and down movement of the slider 603 in the lifting slot 601 can be adjusted by controlling the forward and reverse rotation of the driving motor.

[0064] Embodiment 2:

[0065] Depend on Figure 1-Figure 3 As shown, this embodiment provides a protective device for a circular knitting machine for preparing knitted fabrics. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0066] A collecting structure 8 is disposed below the first filter screen 304, and the collecting structure 8 is used to collect the cleaned fluff.

[0067] Furthermore, the collecting structure 8 includes: a collecting box 801, which is arranged at the bottom of the connecting pipe 301, and a feed port 802 is opened on the top surface of the collecting box 801; an opening 803, which is opened on the side wall of the collecting box 801, and a sealing door 804 is hingedly provided at the opening 803.

[0068] The fluff cleaned by the cleaning structure 6 can fall into the collecting box 801 through the feed port 802. After a certain amount of fluff is collected in the collecting box 801, the sealing door 804 can be opened and the fluff in the collecting box 801 can be cleaned through the opening 803, which is convenient for cleaning the fluff and helps to improve production efficiency and quality.

[0069] Furthermore, a compression structure 9 is provided inside the collecting box 801, and the compression structure 9 includes: a movable plate 901, which is hingedly provided at the feed port 802 to control the opening and closing of the feed port 802; an extrusion plate 902, which is movably provided in the collecting box 801 and is L-shaped; a telescopic cylinder 903, which is provided in the collecting box 801 and has an output shaft connected to the extrusion plate 902; wherein the L-shaped side of the extrusion plate 902 is in contact with the top surface of the collecting box 801.

[0070] When the telescopic cylinder 903 does not push the squeezing plate 902 to move, the movable plate 901 is in an inclined state, so that the cleaned fluff can enter the collection box 801 through the feed port 802, and the telescopic cylinder 903 pushes the squeezing plate 902 to move. During the movement of the squeezing plate 902, the movable plate 901 can be pushed to rotate upward to close the feed port 802 to prevent the fluff from falling into the cavity between the squeezing plate 902 and the telescopic cylinder 903. Through the cooperation between the sealing door 804 and the squeezing plate 902, the fluff can be compressed, which is conducive to increasing the collection capacity of the collection box 801.

[0071] Embodiment 3:

[0072] Depend on Figure 1-Figure 3 As shown, this embodiment provides a protective device for a circular knitting machine for preparing knitted fabrics. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0073] Furthermore, the length of the contact edge between the extrusion plate 902 and the top surface of the collection box 801 is greater than the distance between the sealing door 804 and the feed port 802 .

[0074] By making the length of the fitting edge between the extrusion plate 902 and the top surface of the collection box 801 greater than the distance between the sealing door 804 and the feed port 802, it is possible to avoid the movable plate 901 rotating downward when the extrusion plate 902 is extruding the fluff, causing the extrusion plate 902 to be unable to be retracted normally, which is beneficial to improving the stability of the device.

[0075] Furthermore, a transparent window 11 is provided on the protective door 2 .

[0076] The transparent window 11 can facilitate the operator to observe the circular knitting machine, which greatly reduces the probability of the observing personnel being injured when the circular knitting machine fails, thereby improving the safety of the personnel.

[0077] Furthermore, the air inlet 4 is located below the wire inlet hole 5 , and a second filter screen 10 is disposed in the air inlet 4 .

[0078] By setting the air inlet 4 below the wire inlet hole 5, when the fan 303 draws air, air enters from the air inlet 4, causing an upward airflow in the cover body 1, which can improve the collection efficiency of the lint on the yarn, and by setting the second filter 10, it can prevent impurities on the outside of the cover body 1 from entering the cover body 1, which is beneficial to improving the quality of fabric preparation.

[0079] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A protective device for a circular knitting machine for preparing knitted fabrics, characterized in that ,include: A cover body (1), wherein a large circular knitting machine is arranged inside the cover body (1), and a protective door (2) is movably arranged on the outer wall of the cover body (1); A dust removal component (3), the dust removal component (3) is arranged outside the cover body (1) and is connected to the top of the cover body (1), and the dust removal component (3) comprises: A connecting pipe (301), wherein the connecting pipe (301) is connected to the top of the cover body (1), and an air outlet pipe (302) is connected to the outer wall of the connecting pipe (301). A fan (303), wherein the fan (303) is arranged in the air outlet pipe (302), and a first filter screen (304) is arranged between the air outlet pipe (302) and the connecting pipe (301), A cleaning structure (6), wherein the cleaning structure (6) is movably disposed in the connecting pipe (301) and is used to clean the surface of the first filter screen (304); Wherein, an air inlet (4) is arranged on the outer wall of the cover body (1), and a plurality of wire inlet holes (5) are evenly distributed circumferentially on the outer wall of the cover body (1).

2. The protective device for a circular knitting machine for preparing knitted fabrics according to claim 1, characterized in that: The cleaning structure (6) comprises: A lifting groove (601), wherein the lifting groove (601) is symmetrically arranged on the inner wall of the connecting pipe (301), and a lifting screw rod (602) is rotatably arranged in the lifting groove (601) on one side, and a polished rod is arranged in the lifting groove (601) on the other side; A slider (603), wherein the slider (603) is slidably disposed in the lifting groove (601), and the slider (603) is threadedly connected to the lifting screw rod (602); A brush (604), wherein the brush (604) is disposed between the two sliders (603), and an end surface of the brush (604) is in contact with a surface of the first filter screen (304); A driving structure (7), wherein the driving structure (7) is arranged above the lifting slot (601) and is used to drive the lifting screw rod (602) to rotate.

3. The protective device for a circular knitting machine for preparing knitted fabrics according to claim 2, characterized in that: The driving structure (7) comprises: An air avoidance groove (701), wherein the air avoidance groove (701) is arranged above the lifting groove (601); A driving motor, wherein the driving motor is arranged on the outer wall of the connecting pipe (301), and an output shaft passes through the side wall of the connecting pipe (301); A first bevel gear (702), the first bevel gear (702) being rotatably disposed in the clearance groove (701) and connected to an output shaft of a driving motor; The second bevel gear (703) is meshed with the first bevel gear (702) and connected to the top end of the lifting screw rod (602).

4. The protective device for a circular knitting machine for preparing knitted fabrics according to claim 1, characterized in that: A collecting structure (8) is provided below the first filter screen (304), and the collecting structure (8) is used to collect the cleaned fluff.

5. The protective device for a circular knitting machine for preparing knitted fabrics according to claim 4, characterized in that: The collecting structure (8) comprises: A collecting box (801), wherein the collecting box (801) is arranged at the bottom of the connecting pipe (301), and a feed inlet (802) is provided on the top surface of the collecting box (801); An opening (803), wherein the opening (803) is opened on the side wall of the collection box (801), and a sealing door (804) is hingedly provided at the opening (803).

6. A protective device for a circular knitting machine for preparing knitted fabrics according to claim 5, characterized in that: A compression structure (9) is provided inside the collection box (801), and the compression structure (9) comprises: A movable plate (901), the movable plate (901) is hingedly arranged at the feed inlet (802) to control the opening and closing of the feed inlet (802); A squeezing plate (902), wherein the squeezing plate (902) is movably disposed in the collecting box (801) and is arranged in an L shape; A telescopic cylinder (903), wherein the telescopic cylinder (903) is arranged in the collecting box (801), and an output shaft thereof is connected to the extrusion plate (902); Wherein, the L-shaped side of the extrusion plate (902) is in contact with the top surface of the collection box (801).

7. A protective device for a circular knitting machine for preparing knitted fabrics according to claim 6, characterized in that: The length of the contact edge between the extrusion plate (902) and the top surface of the collection box (801) is greater than the distance between the sealing door (804) and the feed port (802).

8. The protective device for a circular knitting machine for preparing knitted fabrics according to claim 1, characterized in that: The protective door (2) is provided with a transparent window (11).

9. The protective device for a circular knitting machine for preparing knitted fabrics according to claim 1, characterized in that: The air inlet (4) is located below the wire inlet hole (5), and a second filter screen (10) is arranged in the air inlet (4).

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