CN111996658A - Circular knitting machine cloth-shedding detection device and circular knitting machine - Google Patents

Abstract

The invention relates to a circular knitting machine and a cloth falling detection device thereof. The cloth-releasing detection device of the circular knitting machine comprises a support, a cloth bearing piece, a contact element and a detector; the cloth bearing piece is provided with a channel for the cloth to pass through; the inner side wall of the cloth bearing piece is provided with an induction area, the contact piece is movably connected to the support, and the contact piece can move to abut against the induction area; the detector is connected between the contact piece and the sensing area and used for detecting an abutting signal between the contact piece and the sensing area. During the processing of the cloth, the yarns form the cloth on the inner side wall of the cloth bearing piece. Under normal processing conditions, the cloth separates the contact member from the sensing region, in that the contact member presses the cloth against the sensing region. When the cloth takes place to take off the cloth condition, cloth drops from the inside wall of cloth carrier for the contact member butt in the induction zone, and the detector detects the butt signal of contact member butt in the induction zone this moment, can in time detect out the cloth problem of taking off that appears in the course of working.

Description

Circular knitting machine cloth-shedding detection device and circular knitting machine

Technical Field

The invention relates to the technical field of textiles, in particular to a circular knitting machine and a cloth falling-off detection device thereof.

Background

In the textile process, a circular knitting machine is an important processing device which plays an important role in forming cloth. In the cloth processing process, the problem of cloth shedding, such as cloth shedding caused by yarn breakage, occurs inevitably. When a doffing occurs, the yarn or cloth may become wound into the apparatus, causing damage to the apparatus and even injury to the workers. However, in conventional processes, it is difficult to detect these de-cloth problems in a timely manner.

Disclosure of Invention

Accordingly, there is a need for a circular knitting machine and a cloth-off detection device thereof. The cloth-releasing detection device of the circular knitting machine can detect the cloth-releasing problem in the processing process in time.

The technical scheme of the invention is as follows:

a cloth-off detection device of a circular knitting machine comprises a support, a cloth bearing piece, a contact element and a detector;

the cloth bearing piece is provided with a channel for cloth to pass through; an induction area is arranged on the inner side wall of the channel of the cloth bearing piece, the contact piece is movably connected to the support, and the contact piece can move to abut against the induction area;

the detector is connected between the contact and the sensing area for detecting an abutting signal between the contact and the sensing area.

In one embodiment, the circular knitting machine doffing detection device further comprises an elastic piece; the elastic piece is connected between the contact piece and the support and used for assisting the contact piece to abut against the sensing area.

In one embodiment, the contact is a conductive contact and the sensing region is a conductive sensing region; when the contact member abuts against the sensing area, the contact member, the detector and the sensing area form a closed circuit.

In one embodiment, two ends of the sensing area are integrally connected to the inner side wall of the cloth bearing piece.

In one embodiment, the circular knitting machine doffing detection device further comprises a first driving mechanism; the first driving mechanism is connected with the support and used for driving the support to rotate so as to enable the contact piece to move along the sensing area.

A circular knitting machine comprises a circular knitting machine main body and the circular knitting machine cloth-off detection device in any embodiment; the circular knitting machine main body forms cloth on the inner side wall of the cloth bearing piece.

In one embodiment, the circular knitting machine further comprises a controller electrically connected with the detector for receiving the abutting signal between the contact and the sensing area detected by the detector and controlling the circular knitting machine to stop.

In one embodiment, the circular knitting machine further comprises a blowing member; the air blowing piece is movably connected to the support and used for blowing air towards the circular knitting machine main body.

In one embodiment, the blowing end of the blowing member is bent toward the bracket.

In one embodiment, the circular knitting machine further comprises a second drive mechanism; the second driving mechanism is connected with the air blowing piece and used for driving the air blowing piece to rotate.

The cloth-off detection device of the circular knitting machine comprises a support, a cloth bearing piece, a contact element and a detector; the cloth bearing piece is provided with a channel for the cloth to pass through; the inner side wall of the cloth bearing piece is provided with an induction area, the contact piece is movably connected to the support, and the contact piece can move to abut against the induction area; the detector is connected between the contact piece and the sensing area and used for detecting an abutting signal between the contact piece and the sensing area. During the processing of the cloth, the yarns form the cloth on the inner side wall of the cloth bearing piece. Under normal processing conditions, the cloth separates the contact member from the sensing region, in that the contact member presses the cloth against the sensing region. When the cloth takes place to take off the cloth condition, cloth drops from the inside wall of cloth carrier for the contact member butt in the induction zone, and the detector detects the butt signal of contact member butt in the induction zone this moment, can in time detect out the cloth problem of taking off that appears in the course of working.

Furthermore, after the cloth-off detection device of the circular knitting machine detects the cloth-off problem, the device can guide workers to stop the circular knitting machine in time or stop the circular knitting machine automatically to stop the circular knitting machine, so that the cloth-off is prevented from damaging the circular knitting machine. Meanwhile, the damage to workers caused by cloth removal can be avoided, and the safety of the processing process is effectively improved.

The circular knitting machine comprises a circular knitting machine main body and the circular knitting machine cloth-off detection device; the circular knitting machine main body forms cloth on the inner side wall of the cloth bearing piece. In the cloth course of working, above-mentioned circular knitting machine can in time detect out the problem of taking off the cloth. Further, effectively reduce the damage that takes off cloth and cause equipment, can also avoid taking off the cloth and probably cause the injury to the staff, effectively improve the security of course of working.

Drawings

FIG. 1 is a schematic structural diagram of a cloth releasing detection device of a circular knitting machine according to an embodiment of the present invention;

FIG. 2 is a front view of the cloth releasing detecting device of the circular knitting machine corresponding to FIG. 1;

FIG. 3 is a left side view of the cloth falling-off detection device of the circular knitting machine corresponding to FIG. 1;

fig. 4 is a top view of the cloth falling-off detection device of the circular knitting machine corresponding to fig. 1.

The notation in the figure is:

10. a cloth-off detection device of the circular knitting machine; 11. a support; 12. a piece goods carrier; 1201. a sensing region; 13. a contact member; 14. a piece goods cushioning member; 15. an elastic member protective sleeve; 16. an air blowing member; 1601. a blowing end; 1602. a second drive mechanism; 17. and (7) installing holes.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the accompanying examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "bottom", "inner", "outer", etc. in the present invention are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-4, an embodiment of the present invention provides a cloth take-off detection device 10 for a circular knitting machine, where the cloth take-off detection device 10 includes a support 11, a cloth bearing member 12, a contact member 13, and a detector (not shown). The cloth carrier 12 has a passage through which the cloth passes. The cloth carrier 12 has a sensing area 1201 on the inner side wall, the contact 13 is movably connected to the bracket 11, and the contact 13 can move to abut against the sensing area 1201. The detector is connected between the contact 13 and the sensing area 1201 for detecting an abutting signal between the contact 13 and the sensing area 1201.

During the processing of the cloth, the yarns form the cloth on the inner side wall of the cloth bearing piece. When the cloth-dropping detection device 10 of the circular knitting machine in the embodiment is applied to actual production, under normal processing conditions, the contact piece 13 is separated from the sensing area 1201 by the cloth, and the cloth is pressed on the sensing area 1201 by the contact piece 13. When the cloth is removed, the cloth is removed from the inner side wall of the cloth bearing piece 12, so that the contact piece 13 abuts against the sensing area 1201, and the detector detects an abutting signal of the contact piece 13 abutting against the sensing area 1201, so that the cloth removing problem in the processing process can be detected in time.

Further, in this embodiment, after the cloth-off detecting device 10 detects the cloth-off problem, the worker can be timely guided to stop the circular knitting machine or stop the circular knitting machine, so as to avoid damage of the cloth-off to the circular knitting machine. Meanwhile, the damage to workers caused by cloth removal can be avoided, and the safety of the processing process is effectively improved.

In another embodiment of the invention, the circular knitting machine doffing detecting device 10 is composed of a support 11, a cloth carrier 12, a contact piece 13 and a detector. The cloth carrier 12 has a passage through which the cloth passes. The cloth carrier 12 has a sensing area 1201 on the inside wall, the contact 13 is movably connected to the bracket, and the contact 13 can move to abut against the sensing area 1201. The detector is connected between the contact 13 and the sensing area 1201 for detecting an abutting signal between the contact 13 and the sensing area 1201.

As shown in fig. 1, the support 11 of the cloth-off detection device 10 of the circular knitting machine in the present embodiment includes two U-shaped sub-supports. The bottoms of the two U-shaped sub-supports are arranged in a crossed mode, and the side arm of each U-shaped sub-support extends upwards from the bottom of each U-shaped sub-support. Two contact pieces 13 are mounted on the two side arms of one of the U-shaped sub-brackets, and two contact pieces 13 are mounted on one of the U-shaped sub-brackets near the bottom to enable better abutment with the piece goods carrier 12; a blow piece 16 is mounted on the other U-shaped sub-mount.

Preferably, the bottom of the two U-shaped sub-supports forms an acute angle of 30 to 90 degrees when being crossed, so that the two U-shaped sub-supports are convenient to mount, the two contact elements 13 can be kept at a proper distance, and the cloth falling problem of the circular knitting machine can be reflected and detected more accurately. For example, in some specific examples, the acute angles formed by the intersection of the bottoms of the two U-shaped sub-brackets are 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, and 90 °. Preferably, the side arms of the two U-shaped sub-brackets have equal length; further, the length of the side arms of the two U-shaped sub-brackets is 50cm-80 cm; further, the length of the side arm of the two U-shaped sub-brackets can be, but is not limited to, 50cm, 55cm, 60cm, 65cm, 70cm, 75cm, 80cm, 85cm, 90 cm.

Referring to fig. 1 again, in the embodiment, the top of the two U-shaped sub-brackets are provided with mounting holes 17, and the doffing detecting device 10 of the circular knitting machine can be mounted at a proper position of the main body of the circular knitting machine according to production requirements by arranging the mounting holes 17. For example, in a specific circular knitting machine, the cloth discharge detection device 10 of the circular knitting machine is mounted on the top plate of the circular knitting machine main body through mounting holes 17 at the tops of two U-shaped sub-supports. Further, the cloth-releasing detection device 10 of the circular knitting machine is installed on the top disc of the circular knitting machine main body through the installation holes 17 at the tops of the two U-shaped sub-supports, the support 11 can be driven to rotate through the action of the circular knitting machine in the production process, and therefore under the normal processing condition, the two contact pieces 13 can continuously press cloth on the inner side wall of the cloth bearing piece 12. Preferably, two contact members 12 can continuously press cloth in the sensing area 1201 of the inside wall of the cloth carrier 12, so that the cloth removing problem of the circular knitting machine can be detected in real time, and once the cloth is removed, the contact member 13 can be timely abutted against the sensing area 1201, and the cloth removing problem can be timely detected through a detector.

It is understood that the connection relationship between the contact 13 and the bracket 11 is not limited to the two contacts 13 shown in fig. 1 being respectively located on the two side arms of one of the U-shaped sub-brackets. For example, the number of the contact pieces 13 is 1, 1 contact piece 13 is mounted on any one side arm of the two U-shaped sub-brackets, and the contact piece 13 can move to abut against the sensing area 1201 on the inner side wall of the cloth carrier 12. For another example, the number of the contact elements 13 is 3, 3 contact elements 13 are respectively located on any 3 side arms of the two U-shaped sub-brackets, and all 3 contact elements 13 can move to abut against the sensing area 1201 on the inner side wall of the cloth carrier 12; the number of the contact pieces 13 is 1, the other 2 contact pieces 13 are located on the other side arm of the two U-shaped sub-supports, and the 3 contact pieces 13 can move to abut against the sensing area 1201 on the inner side wall of the cloth carrier 12; it is also possible that 3 contact members 13 are located on any one side arm of the two U-shaped sub-brackets, and 3 contact members 13 can move to abut against the sensing area 1201 on the inner side wall of the cloth carrier 12.

On the other hand, the number of the U-shaped sub-racks is not limited to 2. In some specific examples, the number of U-shaped sub-racks may be, but is not limited to, 1, 2, 3, 4. Meanwhile, the shape of the sub-mount is not particularly limited, and one of the reasons for providing the sub-mount in a U-shape in the present embodiment is to facilitate the installation of the contact 13 and the blowing member 16; in addition, the reason why the shape of the sub-frame is set to be U-shaped in the present embodiment is that it is convenient to match and install with the main body of the conventional circular knitting machine, and it is convenient to modify the main body of the conventional circular knitting machine to obtain a circular knitting machine with new functions.

In a preferred embodiment, the support 11 has a central axis of rotation. Further, the rotation center axis of the holder 11 is on the same straight line as the center axis of the cloth carrier 12. When the bracket 11 rotates, the contact 13 can stably abut against the sensing area 1201 and is uniformly stressed, which is beneficial to prolonging the service life of the contact.

Preferably, the radial cross-section of the piece goods carrier 11 is circular in shape. The installation and operation of the equipment are more convenient at this time.

Still further preferably, the circular knitting machine doffing detecting device 10 further comprises a first driving mechanism (not shown in the figure); the first driving mechanism is connected with the bracket 11 for driving the bracket 11 to rotate so as to realize the movement of the contact piece 13 along the sensing area 1201. In particular, the first driving mechanism is connected to the support 11 for driving the support 11 to rotate along the rotation central axis thereof, so that the contact element 13 keeps pressing the cloth against the inner side wall of the cloth carrier 12, facilitating real-time detection of the abutting signal of the contact element with the sensing area 1201.

In a specific example, the sensing area 1201 is integrally connected to both ends of the inner side wall of the cloth bearing member 12. In this case, during the rotation of the support 11, the contact element 13 keeps pressing the cloth against the sensing area 1201, and once a cloth release problem occurs, the contact element 13 can abut against the sensing area 1201, which is beneficial to improving the accuracy and reliability of the cloth release detection device 10 of the circular knitting machine.

Preferably, the inner side walls of the cloth carrier 12 are all the sensing areas 1201. The inner side walls of the cloth bearing piece 12 are all induction areas 1201, so that the accuracy and the reliability of the cloth releasing detection device 10 of the circular knitting machine can be further improved.

As a preferred aspect of the present invention, the contact 13 is a conductive contact, and the sensing region 1201 is a conductive sensing region; when the contact 13 abuts against the sensing region 1201, the contact 13, the detector, and the sensing region 1201 form a closed circuit. When the contact 13 is separated from the sensing region 1201 by the cloth during normal processing, the contact 13, the detector, and the sensing region 1201 cannot form a closed circuit and appear as an open circuit, and the detector cannot detect a contact signal between the contact 13 and the sensing region 1201. When the doffing occurs, the contact 13 abuts against the sensing area 1201, and at this time, the contact 13, the detector and the sensing area 1201 form a closed circuit, and the detector detects an abutting signal of the contact 13 and the sensing area 1201. The contact 13 is the conductive contact 1 and the sensing region 1201 is the conductive sensing region, and the contact signal between the contact 13 and the sensing region 1201 is detected by closing and opening the circuit, so that the detection sensitivity can be improved.

Specifically, the contacts 13 may be, but are not limited to, conductive metal contacts, conductive alloy contacts, conductive non-metal contacts, and the like, such as iron contacts, stainless steel contacts, aluminum alloy contacts, graphite contacts, and the like. Sensing region 1201 can be, but is not limited to, a conductive metal sensing region, a conductive alloy sensing region, a conductive non-metal sensing region, and the like, such as an iron sensing region, a stainless steel sensing region, an aluminum alloy sensing region, a graphite sensing region, and the like.

In a specific example, a conventional circular knitting machine includes a needle cylinder element, and when the circular knitting machine cloth discharge detecting device 10 is installed, the needle cylinder of the circular knitting machine can be used as the cloth carrier 12, and then other elements of the circular knitting machine cloth discharge detecting device 10 are installed.

In another preferred embodiment, the circular knitting machine doffing detecting device 10 further includes an elastic member (not shown in the drawings); the elastic member is connected between the contact member 13 and the bracket 11 for assisting the contact member 13 to abut against the sensing area 1201. Under normal processing conditions, the contact piece 13 presses the cloth on the inner side wall of the cloth bearing piece 12 through the elastic piece, when the cloth is detached, the cloth falls off between the contact piece 13 and the inner side wall of the cloth bearing piece 12, and at the moment, the contact piece 13 can be in contact with the inner side wall of the cloth bearing piece 12 in a self-adaptive mode through the elasticity of the elastic piece. It is further preferred that the elastic member is connected between the contact member 12 and the holder 11 to achieve the movable connection between the contact member 13 and the holder 11. The movable connection between the contact element 13 and the support 11 is realized through the self-adaptability of the elastic element, the structure can be simplified, the cost is reduced, and meanwhile, the contact element 13 can be abutted to the inner side wall of the cloth bearing piece 1201 in time when cloth is removed.

In this embodiment, the contact member 13 is attached to the holder 11 by an elastic member. Specifically, both ends of the elastic member are connected to the holder 11 and the contact member 13, respectively.

As a specific example of the elastic member, the elastic member may be, but is not limited to, a spring. The movable connection between the contact 13 and the holder 11 is achieved by the elasticity of the spring. Specifically, both ends of the spring are connected to the holder 11 and the contact 13, respectively.

Referring to fig. 1-4 again, the cloth-releasing detecting device 10 of the circular knitting machine in this embodiment further includes an elastic member protecting sleeve 15, and the elastic member protecting sleeve 15 is disposed outside the elastic member, i.e. the side surface of the elastic member is covered by the elastic member protecting sleeve 15. The elastic piece protective sleeve 15 plays a certain protection role on the elastic piece, and is beneficial to preventing the elastic piece from being damaged in the processing process. The elastic member protective sheath 16 also prevents impurities such as yarn, fly, etc. from adhering to the surface of the elastic member during processing and adversely affecting the elastic member. In addition, the elastic piece protective sleeve 15 can also prevent the cloth from being hung on the elastic piece and from being adversely affected by normal cloth stripping of the cloth. Especially, when the elastic component is the spring, because spring structure's particularity, inside yarn, flyings, fly impurity such as hair got into the spring easily, and cloth blocked in the spring easily, and this moment, elastic component protective sheath 15 can prevent effectively that impurity from getting into the spring and causing adverse effect to the spring, can also prevent that cloth from blocking in the spring, prevents to take off the strap to come adverse effect to the normal of cloth.

In a specific example, the circular knitting machine doffing detecting device 10 further includes a piece goods buffer 141; the piece goods buffer 14 extends from the contact piece 13 to the bracket 11 and away from the connection of the contact piece 13 and the bracket 11 for buffering the cloth removal. The cloth buffering piece 14 is arranged to enable cloth to smoothly pass through the cloth bearing piece 12 in the cloth releasing process, and the risk of cloth clamping is reduced.

In this embodiment, the number of the cloth dampers 14 is 4. Each contact element 13 corresponds to 2 cloth buffers 14, and the 2 cloth buffers 14 are symmetrically arranged. Specifically, the 2 piece goods buffers 14 form an isosceles triangle with the bracket 11. More specifically, the 2 piece goods buffers 14 are symmetrically distributed with the elastic member as a symmetry axis.

In a specific example, the circular knitting machine doffing detecting device 10 further comprises a signal feedback device (not shown in the figure). The signal feedback device is electrically connected with the detector and used for receiving the abutting signal detected by the detector and feeding back the abutting signal. Specifically, the signal feedback ware feeds back the butt signal to the staff, is used for reminding the staff problem that the cloth had taken off to the course of working. And then the worker receives the signal and then performs corresponding processing on the circular knitting machine, such as stopping the circular knitting machine. The feedback mode of the signal feedback device can be a warning light and/or a warning sound, such as buzzing. In addition, the signal feedback device can also feed back the abutting signal to the circular knitting machine, and then the circular knitting machine can realize the automatic stop of the circular knitting machine through the controller.

A further embodiment of the present invention provides a circular knitting machine including a circular knitting machine main body and the circular knitting machine cloth discharge detection apparatus 10 in any one of the above examples or any one of the embodiments or any one of the aspects; the circular knitting machine main body forms cloth on the inner side wall of the cloth bearing piece. In the cloth course of working, the circular knitting machine in this embodiment can detect the problem of taking off the cloth in time. Further, effectively reduce the damage that takes off cloth and cause equipment, can also avoid taking off the cloth and probably cause the injury to the staff, effectively improve the security of course of working.

In a specific example, the circular knitting machine further comprises a controller (not shown in the figures) electrically connected with the detector for receiving the abutment signal between the contact 13 and the sensing area 1201 detected by the detector and controlling the circular knitting machine to stop. When the cloth is removed, the contact piece 13 is abutted with the sensing area 1201, and the controller receives an abutting signal detected by the detector and controls the circular knitting machine to stop. The circular knitting machine can be prevented from continuously working after the cloth is removed to cause injury to equipment and even workers.

In a particular example, the circular knitting machine further comprises a blowing member 16; the blowing member is movably connected to the support 11 for blowing air toward the circular knitting machine body. In the processing process of the circular knitting machine, impurities such as flying flowers and flying hairs are easy to appear due to the abrasion of the yarns, particularly, when yarns with different colors are processed, the flying flowers and the flying hairs with different colors are generated, and the impurities such as the flying flowers and the flying hairs are easy to gather or accumulate to form flaws on the surface of the cloth. The arrangement of the air blowing piece 16 can blow away flying flowers, flying hair and other impurities, so that the impurities are prevented from being gathered or accumulated, the impurities can be prevented from forming flaws on the surface of the cloth, and the quality of the cloth is improved.

Preferably, the blowing end 1601 of the blowing piece 16 is bent towards the support 11. The blowing end 1601 of the blowing piece 16 is bent towards the support 11, so that the blowing area can be increased, the blowing effect is improved, and the quality of the cloth is further improved.

Further preferably, the circular knitting machine further comprises a second drive mechanism 1602; the second driving mechanism 1602 is connected to the air-blowing member 16 for driving the air-blowing member to rotate. Thus, the blowing area can be further increased, and the blowing effect can be improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a circular knitting machine takes off cloth detection device which characterized in that: comprises a bracket, a cloth bearing piece, a contact piece and a detector;

the cloth bearing piece is provided with a channel for cloth to pass through; an induction area is arranged on the inner side wall of the channel of the cloth bearing piece, the contact piece is movably connected to the support, and the contact piece can move to abut against the induction area;

the detector is connected between the contact and the sensing area for detecting an abutting signal between the contact and the sensing area.

2. The cloth-off detection device of the circular knitting machine according to claim 1, characterized in that: the device also comprises an elastic piece; the elastic piece is connected between the contact piece and the support and used for assisting the contact piece to abut against the sensing area.

3. The cloth-off detection device of the circular knitting machine according to claim 1, characterized in that: the contact element is a conductive contact element, and the induction area is a conductive induction area; when the contact member abuts against the sensing area, the contact member, the detector and the sensing area form a closed circuit.

4. The circular knitting machine doffing detection device according to claim 3, characterized in that: on the inside wall of the cloth bearing piece, two ends of the induction area are connected into a whole.

5. The cloth-off detection device of the circular knitting machine according to claim 4, characterized in that: the device also comprises a first driving mechanism; the first driving mechanism is connected with the support and used for driving the support to rotate so as to enable the contact piece to move along the sensing area.

6. A circular knitting machine is characterized in that: comprising a circular knitting machine main body and the circular knitting machine doffing detection device according to any one of claims 1 to 5; the circular knitting machine main body forms cloth on the inner side wall of the cloth bearing piece.

7. The circular knitting machine according to claim 6, characterized in that: the circular knitting machine further comprises a controller, and the controller is electrically connected with the detector and used for receiving the abutting signals between the contact element and the induction area detected by the detector and controlling the circular knitting machine to stop.

8. The circular knitting machine according to any of claims 6 to 7, characterized in that: the device also comprises an air blowing piece; the air blowing piece is movably connected to the support and used for blowing air towards the circular knitting machine main body.

9. The circular knitting machine according to claim 8, characterized in that: the blowing end of the blowing piece is bent towards the bracket.

10. The circular knitting machine according to claim 9, characterized in that: the device also comprises a second driving mechanism; the second driving mechanism is connected with the air blowing piece and used for driving the air blowing piece to rotate.

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