An encrypted sewing control method and sewing apparatus

Abstract

The application relates to an encryption sewing control method and a sewing device, wherein the encryption sewing control method comprises the following steps: dragging cloth by a cloth wheel to run at a first speed, performing skip sewing or normal sewing on the cloth at the first speed; detecting the cloth position in real time, and dragging the cloth by the cloth wheel to run at a second speed when the cloth runs to a predetermined position, and performing encryption sewing on the cloth at the second speed; wherein the second speed is less than the first speed. The encryption sewing control method can reduce the stitch length under the premise of keeping the needle movement frequency unchanged through the cooperation of one or more ways, avoid the thread end formed by skip sewing from being pulled to cause the stitch to be loose, and ensure the garment quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of garment processing and equipment, in particular to a method for encrypted sewing control and a sewing device. BACKGROUND

[0002] In the field of garment manufacturing, different fabrics often need to be sewn together. Based on design and process requirements, there may be a skip-stitch area, i.e., the bottom thread does not intersect with the face thread in this area.

[0003] Taking the upper waist process of jeans as an example, the fabrics that need to be sewn together are waistband and body fabric. Generally, chain stitches are used, and after skipping in the local area, there will be thread ends (non-intersecting face threads and bottom threads). During garment handling, the thread ends floating on the surface of the fabric are easy to be pulled, resulting in thread pulling phenomenon, which causes the thread to loosen, seriously affecting the appearance and sewing quality of the upper waist part. Generally, it can only be repaired by manual needle repair, which increases the cost and reduces the garment quality. At present, there is no effective method to avoid this situation. SUMMARY

[0004] In view of the problems of the prior art, the present application provides a sewing method for a skip-stitch area, which can avoid thread ends being pulled apart.

[0005] The present application provides a method for encrypted sewing control, comprising:

[0006] dragging the fabric to move at a first speed by a fabric dragging wheel, and performing skip-stitch or normal sewing on the fabric at the first speed;

[0007] detecting the position of the fabric in real time, and dragging the fabric to move at a second speed by the fabric dragging wheel when the fabric moves to a predetermined position, and performing encrypted sewing on the fabric at the second speed;

[0008] wherein the second speed is less than the first speed.

[0009] The following also provides several optional modes, but not as an additional limitation to the above general scheme, but only as a further supplement or preference. Without technical or logical contradiction, each optional mode can be combined with the above general scheme, and multiple optional modes can also be combined.

[0010] In one embodiment, the skip-stitch, the normal sewing, and the encrypted sewing correspond to a skip-stitch area, a normal sewing area, and an encrypted sewing area, respectively, and the upstream and / or downstream of the skip-stitch area is adjacent to the encrypted sewing area along the sewing path.

[0011] In one embodiment, the fabric is sewn by a needle driving a top thread to intersect with a bottom thread, wherein the tension of the top thread is increased relative to the normal sewing when the security sewing is performed.

[0012] In one embodiment, the tension of the top thread is increased by at least one of the following ways:

[0013] extending the path of the top thread;

[0014] applying a frictional resistance to the top thread.

[0015] In one embodiment, the security sewing control method further drives the fabric to move by a cooperating presser foot and feed dog, and when the tension of the top thread is increased, the presser foot is correspondingly lowered.

[0016] The present application also provides a sewing machine comprising a feed device for driving the fabric to move, and a sewing device for sewing the fabric, wherein the feed device comprises a fabric dragging wheel for dragging the fabric to move, and the sewing device comprises a thread clamp assembly through which the top thread passes, and a needle which carries the top thread to reciprocate on both sides of the fabric, and the fabric dragging wheel is adjustable in speed to implement the security sewing control method as described in the present application.

[0017] In one embodiment, the sewing machine further comprises:

[0018] a sensor for detecting the fabric and providing a corresponding position signal;

[0019] a controller for receiving the position signal and controlling the fabric dragging wheel to adjust the speed accordingly.

[0020] In one embodiment, the thread clamp assembly comprises:

[0021] a front thread passing plate having a first thread passing hole;

[0022] a rear thread passing plate having a second thread passing hole;

[0023] a thread beating rod having a third thread passing hole, the top thread passing through the first thread passing hole, the third thread passing hole and the second thread passing hole in sequence, and the thread beating rod is movably mounted and controlled by the controller to change the tension of the top thread.

[0024] In one embodiment, the feed device further comprises a presser foot and a feed dog which cooperate to hold the fabric to move, the pressure of the presser foot is adjustable and controlled by the controller, and the pressure of the presser foot is adjusted in linkage with the tension of the top thread.

[0025] In one embodiment, the sewing machine further comprises:

[0026] The feedback device detects the operation signal and feeds back to the controller, so that the controller drives the mop wheel, the presser foot and the thread tensioner assembly according to the operation signal related to the speed of the mop wheel, the pressure of the presser foot and the tension of the thread.

[0027] The encryption sewing control method of the present application can reduce the stitch length while keeping the needle movement frequency unchanged through the cooperation of one or more ways, avoid the thread end formed by skip sewing being pulled to cause the loose stitch, and ensure the quality of garment processing. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the sewing equipment in an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the sewing equipment in an embodiment of the present application. Figure 1 It is a schematic diagram of the three-dimensional structure of the sewing equipment in an embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the sewing equipment in an embodiment of the present application. Figure 1 It is a schematic diagram of the three-dimensional structure of the sewing equipment in an embodiment of the present application.

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the sewing equipment in an embodiment of the present application. Figure 1 It is a schematic diagram of the thread tensioner assembly structure of the sewing equipment in an embodiment of the present application.

[0033] Figure 5 It is a schematic diagram of the thread tensioner assembly structure of the sewing equipment in an embodiment of the present application. Figure 4 It is an enlarged view of part A in the above figure.

[0034] Figure 6 It is an enlarged view of part A in the above figure. Figure 5 It is a schematic diagram of the thread tensioner assembly structure of the sewing equipment in an embodiment of the present application.

[0035] Figure 7 It is a schematic diagram of the principle of the encryption sewing control method in an embodiment of the present application.

[0036] Figure 8 It is a flow chart of the encryption sewing control method in an embodiment of the present application.

[0037] Figure 9 It is a schematic diagram of the stitch distribution after the encryption sewing control method is implemented.

[0038] The element reference signs are as follows:

[0039] 100 sewing machine; 110 frame; 120 motor; 130 presser bar; 140 first sensor; 150 second sensor; 160 thread tensioner assembly; 161 front thread guide plate; 162 first thread guide hole; 163 rear thread guide plate; 164 second thread guide hole; 165 thread beating bar; 166 third thread guide hole; 167 air cylinder; 168 connecting seat; 170 needle; 180 presser foot; 190 bobbin thread; 200 body fabric; 210 waistline. DETAILED DESCRIPTION

[0040] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application.

[0041] It should be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can 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 can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used in the description of the specification are for the purpose of illustration only and do not indicate or imply absolute orientation.

[0042] In addition, the terms "first", "second", and the like, are used merely to describe the elements and do not indicate or imply a relative importance or a specific order. Thus, a feature defined with "first", "second", etc. can implicitly or explicitly include at least one of the features. In the description of the specification, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above", and "over" of a first feature to a second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above", and "over" of a first feature to a second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height (or in a use state, or in a certain drawing perspective). The "under", "below", and "under" of a first feature to a second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height (or in a use state, or in a certain drawing perspective).

[0044] Unless otherwise defined, all technical and scientific terms used in the application's specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. The terminology used in the application's specification is for describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] In order to solve the problem that the thread ends after skip stitching are easily pulled to cause the stitches to be loose in the prior art, see Figures 1-3 An embodiment of the application provides a sewing equipment. The following embodiments take a sewing machine 100 as an example. The stitch density can be changed at the end of the skip stitching area as required. Compared with normal sewing, the stitches formed after the stitch density is reduced are denser, that is, the encryption sewing is realized. The encryption sewing can further improve the connection firmness of the sewing thread and the cloth compared with the normal sewing. The stitches are not easily pulled apart and damaged when pulled by the thread ends.

[0046] The following mainly describes the improved part of the sewing machine 100. The part not mentioned can be implemented in combination with the prior art. The sewing machine 100 of the embodiment comprises a cloth feeding device for driving the cloth to advance and a sewing device for sewing the cloth.

[0047] The sewing machine 100 specifically comprises a machine frame 110. The cloth feeding device comprises cloth dragging wheels 130 for dragging the cloth to advance. The cloth dragging wheels 130 are arranged in pairs. The same pair of cloth dragging wheels 130 is respectively arranged on the upper and lower sides of the cloth. The cloth dragging wheels 130 clamp and drag the cloth to advance when rotating. At least one of the same pair of cloth dragging wheels 130 acts as a driving wheel and is connected with a power mechanism. For example, the power mechanism can adopt a motor 120 and is connected with the cloth dragging wheels 130 through a transmission mechanism. The cloth dragging wheels 130 can be mounted on height-adjustable lifting frames, so as to facilitate the prepositioning of the cloth and adapt to the change of the cloth thickness.

[0048] The sewing device comprises related components for conveying the top thread 190 and the bottom thread. The related components for conveying the bottom thread can be implemented in combination with the prior art. The related components for conveying the top thread 190 comprise a thread tensioner assembly 160 through which the top thread 190 passes and provides tension, and a needle 170 that carries the top thread 190 to reciprocate on both sides of the cloth to perform sewing.

[0049] In the embodiment, when the encryption sewing needs to be implemented, the motor 120 changes the rotating speed of the cloth dragging wheels 130, that is, the movement speed of the cloth dragging wheels 130 is adjustable to change the advancing speed of the cloth. In the case that the reciprocating frequency of the needle 170 is unchanged, the stitch density can be reduced to obtain denser stitches due to the reduced advancing speed of the cloth.

[0050] In order to facilitate automatic control, in one embodiment, the sewing machine 100 further comprises a first sensor 140 for detecting the edge position of the cloth in real time and providing a corresponding position signal, according to the distance between the first sensor 140 and the needle 170 and in combination with the traveling speed of the cloth, the timing of the sewing position of the cloth reaching the needle 170 can be conveniently converted, and the expected sewing mode can be switched accordingly, for example, normal sewing, skip sewing or dense sewing can be performed, the "normal" sewing and the "dense" sewing in the present application are relative concepts, that is, the dense sewing has a smaller stitch length, but the specific value of the stitch length is not strictly limited, for example, the stitch length of the dense sewing is 50%~90% of the stitch length of the normal sewing, and for example, the stitch length of the dense sewing is greater than or equal to 0.5mm and less than the stitch length of the normal sewing.

[0051] In the embodiment, the sewing machine 100 further comprises a controller, for example, the controller can adopt a programmable logic controller (PLC), the controller is used to control the operation of the sewing machine 100 as a whole, can receive the position signal from the first sensor 140 and drive the corresponding controlled components and cooperate with the change of the sewing mode, and can adjust the speed of the cloth wheel 130 during dense sewing, in a specific manner, for example, the speed of the motor 120 can be changed or the transmission ratio of the motor 120 and the cloth wheel 130 can be changed, etc., so as to reduce the traveling speed of the cloth.

[0052] In some embodiments, the sewing machine 100 is also configured with an automatic cutting function, for example, a cutter controlled by the controller, and a second sensor 150 for detecting the position of the cloth, the second sensor 150 can detect the edge position of the cloth (and the edge shape of the cloth as needed) and drive the cutter through the controller to cut the leading edge and / or the trailing edge of the cloth, or the thread bundle at the edge of the cloth.

[0053] In the direction of the cloth traveling, the first sensor 140 is upstream of the needle 170, and the second sensor 150 is downstream of the needle 170, and the sensors themselves can adopt the prior art.

[0054] In one embodiment, the sewing machine 100 can not be provided with a presser foot and a feed dog, for example, only the cloth wheel 130 is used to drive the cloth to travel, and in other embodiments, the presser foot 180 and the feed dog can also be used in cooperation, the presser foot 180 and the feed dog cooperate with each other to intermittently clamp and move the cloth, the presser foot 180 is installed above the cloth and the height of the presser foot 180 is adjustable, the height adjustment of the presser foot 180 can be driven by the controller, for example, by a controlled cylinder or motor to drive the presser foot 180, the change of the height of the presser foot 180 also means that the pressure of the presser foot 180 relative to the cloth and the feed dog changes, that is, the clamping force of the presser foot 180 and the feed dog to the cloth changes, and the configuration of the presser foot 180 and the feed dog can make the sewing equipment applicable to a wider range of scenarios.

[0055] In one embodiment, the thread tension of the thread clamp assembly 160 can be adjusted for the top thread 190, for example, a movable component is provided in the thread clamp assembly 160 to change the extension path of the top thread 190, or other components are provided to apply frictional resistance to the top thread 190.

[0056] When the encryption sewing is implemented, the rotation speed of the presser wheel 130 can be changed, and at the same time, the tension of the top thread 190 can be increased and the pressure of the presser foot 180 can be reduced. In this way, the fabric between the presser foot 180 and the feed dog can be appropriately retracted (move in the opposite direction of the fabric), further ensure to reduce the stitch length, and also can switch the sewing mode without stopping, realize continuous sewing operation, further improve the production efficiency.

[0057] Referring to Figures 4-6 In one embodiment, the tension of the top thread 190 is changed by the improved thread clamp assembly 160, for example, at least one component in the thread clamp assembly 160 is a movable component and can drive the top thread 190 to change the transmission path, for example, the thread clamp assembly 160 includes:

[0058] The front thread guide plate 161 is provided with a first thread guide hole 162;

[0059] The rear thread guide plate 163 is provided with a second thread guide hole 164;

[0060] The front thread guide plate 161 and the rear thread guide plate 163 both have bending positions opposite to each other, and the first thread guide hole 162 and the second thread guide hole 164 are respectively arranged in the corresponding bending positions.

[0061] The thread clamp assembly 160 further includes a thread beating rod 165, the thread beating rod 165 is located between the bending positions of the front thread guide plate 161 and the rear thread guide plate 163, and the thread beating rod 165 is provided with a third thread guide hole 166, and the top thread 190 passes through the first thread guide hole 162, the third thread guide hole 166 and the second thread guide hole 164 in sequence.

[0062] In this embodiment, the thread beating rod 165 is movably installed and controlled by the controller. In order to drive the thread beating rod 165, the thread clamp assembly 160 further includes a pneumatic cylinder 167, which can be installed on one of the thread guide plates. The piston rod of the pneumatic cylinder 167 is fixed with the thread beating rod 165 through a connecting seat 168. When it is needed to increase the tension of the top thread 190, the pneumatic cylinder 167 drives the thread beating rod 165 to move, and then drives the third thread guide hole 166 to change the position, so that the extension path of the top thread 190 is lengthened and more tortuous. Figure 5 and Figure 6 It can be seen that after the thread beating rod 165 is lifted up, the extension path of the top thread 190 between the first thread guide hole 162 and the second thread guide hole 164 changes from relatively straight to obvious zigzag, so as to appropriately increase the tension of the top thread 190, and the fabric can be driven back relative to the feed dog to realize encryption sewing.

[0063] In order to facilitate closed-loop control, in one embodiment, the sewing machine 100 further comprises a feedback device, which can be a plurality of inductive elements or measuring elements, etc., capable of directly collecting the movement speed of the presser foot 180, the pressure of the presser foot 180, and the tension of the face thread 190, or collecting other parameters associated with these parameters for the controller to convert, regardless of the way, which can be understood as detecting an operating signal. After the operating signal is fed back to the controller, the controller can adjust the controlled components in real time to make the operating signal tend to be within the expected range, so as to ensure the effect of the encryption sewing and the correct resetting of the related components after the encryption sewing is completed.

[0064] Based on the above-mentioned embodiments of the sewing equipment, one embodiment of the present application further provides an encryption sewing control method. The main principle can be referred to Figure 7 The controller obtains or calculates the real-time position of the fabric through the position signal of the inductor. When encryption sewing needs to be implemented, the rotation speed of the presser foot is changed to reduce the stitch length. In addition, according to the configuration of the sewing equipment, the presser foot pressure can be further reduced, and the face thread tension can be increased.

[0065] For example, when only the presser foot 130 is used to drag the fabric to move, the encryption sewing control method of the present embodiment includes:

[0066] The fabric is dragged by the presser foot 130 to move at a first speed, and the fabric is jump-stitched or normally sewn at the first speed;

[0067] The position of the fabric is detected in real time. When the fabric moves to a predetermined position, the fabric is dragged by the presser foot 130 to move at a second speed, and the fabric is encryption sewn at the second speed;

[0068] The second speed is less than the first speed. After the jump-stitching, normal sewing, and encryption sewing are implemented, the jump-stitching area, the normal sewing area, and the encryption sewing area are formed, respectively. In order to avoid the thread end formed by the jump-stitching from being pulled and damaged, the upstream and / or downstream of the jump-stitching area is adjacent to the encryption sewing area along the sewing path, so as to improve the connection strength of the sewing thread at the end of the jump-stitching and the fabric.

[0069] When the sewing equipment is configured with a presser foot and a feed dog that cooperate with each other, the face thread tension is increased and the presser foot pressure is reduced during the encryption sewing. The increase in the face thread tension can be to extend the extension path of the face thread or to apply a frictional resistance to the face thread.

[0070] Referring to Figure 8 , the encryption sewing control method of the present application is further illustrated in one embodiment of the present application by taking the upper waistband process of the jeans as an example. The inductor and other components mentioned herein can be combined with Figure 1 The fabric mentioned herein includes the body fabric 200 and the strip-shaped waistband 210. Referring toFigure 9 , by different period of sewing, the formed stitch includes corresponding skip-stitch area, normal sewing area and encryption sewing area, which will be described in detail below.

[0071] When performing the sewing operation, the waist head 210 is put under the presser foot 180 by pressing the sewing machine 100 pedal in turn, and then the normal sewing A needle (i.e. the normal sewing A needle of the waist piece) is performed to form the normal sewing area L1 in the Figure 9 .

[0072] Then the skip-stitch (i.e. skip-stitch) is started, at this time the large body cloth 200 can be stacked with the waist head 210 together according to the actual situation, when the sensor senses the fabric, i.e. the first sensor 140 detects the front edge of the large body cloth 200, the distance between the preset sewing position of the large body cloth 200 and the needle 170 is converted into the number of needles, and then the skip-stitch B needle is continued, thus the two skip-stitches before and after the sensor sensing the fabric form the skip-stitch area L2 in the Figure 9 .

[0073] At this time, the sewing position of the large body cloth 200 corresponds to the needle 170, and the normal sewing can be further performed, in this process, if the second sensor 150 senses the cloth, the cutting time can be calculated by the controller, and the corresponding cutting of the cutter is driven to cut off the excess waist head 210 in the front section. During the process of the cloth, the first sensor 140 will always detect the cloth until the rear edge of the cloth leaves the first sensor 140, i.e. the sensor does not sense the fabric, at this time, according to the relative position of the cloth and the needle 170, the normal sewing C needle is further performed, thus the part from the skip-stitch B needle to the normal sewing forms the normal sewing area L3 in the Figure 9 .

[0074] The normal sewing C needle means that the cloth travels to the position where the encryption sewing is needed, the controller can control the speed of the motor 120 to slow down, i.e. the speed of the drag cloth wheel 130 is reduced to correspondingly make the drag cloth needle distance smaller, at the same time, the pressure of the presser foot 180 is reduced, and the extension path of the thread 190 is changed by the thread clamp assembly 160 to make the tension of the thread 190 larger, so that when the needle moves forward, the tension of the thread 190 overcomes the pressure of the presser foot 180 to pull the cloth back, the actual needle distance is reduced, the encryption sewing (i.e. the sewing D needle) is realized, and the encryption sewing area L4 in the Figure 9 is formed. Similarly, when the second sensor 150 senses that the cloth leaves, the controller can control the cutter to cut the excess cloth at the rear end.

[0075] After the encryption sewing (i.e. the sewing D needle) is performed, the skip-stitch E needle can be further performed according to the process flow to form the skip-stitch area L5 in the Figure 9 .

[0076] Then the normal sewing can be further performed, for example, the normal sewing F needle can be performed to form the normal sewing area L6 in the Figure 9The normal sewing area L6 in the middle is sewn until the whole process is completed.

[0077] In this embodiment, the stitch density is increased by reducing the presser foot pressure, reducing the distance between the presser feet of the presser bar, and appropriately increasing the tension of the top thread. In other embodiments, the feed dog structure of the sewing machine head can be removed, and the presser bar can rely only on the presser bar to press the cloth. In this case, the stitch density can be increased by simply reducing the distance between the presser feet of the presser bar. This can meet the skip-stitch requirement of the waist seam of the jeans, and also realize the function of increasing the stitch density, thereby preventing the stitches from loosening.

[0078] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present disclosure, as long as the combination does not result in contradictions. When the technical features in different embodiments are embodied in the same figure, it can be considered that the figure also discloses the combination of each embodiment involved.

[0079] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be considered as a limitation on the patent application scope. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An encryption stitching control method, characterized by, The method comprises: towing the fabric by a fabric wheel to travel at a first speed at which the fabric is subjected to skip stitching or normal stitching; detecting the position of the fabric in real time, and towing the fabric by the fabric wheel to travel at a second speed at which the fabric is subjected to security stitching when the fabric travels to a predetermined position; wherein the second speed is less than the first speed; the fabric is sewn by a needle to drive the thread to intersect with a bottom thread, wherein the tension of the thread is increased relative to the normal stitching when the security stitching is performed; the security stitching control method further comprises: driving the fabric to travel by a cooperating presser foot and feed dog, and the tension of the thread is also linked to reduce the pressure of the presser foot when increased.

2. The cryptographic stitch control method of claim 1, wherein, The skip stitching, the normal stitching and the security stitching correspond to a skip stitching area, a normal stitching area and a security stitching area respectively, and the skip stitching area is adjacent to the security stitching area upstream and / or downstream along the sewing path.

3. The cryptographic stitch control method of claim 1, wherein, Increasing the tension of the thread is selected from at least one of the following ways: extending the extension path of the thread; applying friction resistance to the thread.

4. A sewing apparatus comprising a feed device for driving the progress of a cloth, and a sewing device for sewing the cloth, wherein the feed device comprises a drag wheel for dragging the progress of the cloth, and the sewing device comprises a thread clamp assembly through which a thread is passed, and a needle which carries the thread to reciprocate on both sides of the cloth, characterized in that, The movement speed of the fabric wheel is adjustable to implement the security stitching control method of any one of claims 1-3.

5. The sewing apparatus according to claim 4, wherein The sewing device further comprises: a sensor for detecting the fabric and providing a corresponding position signal; a controller receiving the position signal and corresponding controlling the fabric wheel to adjust the movement speed.

6. The sewing apparatus according to claim 5, wherein The thread clamp assembly comprises: a front thread guide plate having a first thread hole; a rear thread guide plate having a second thread hole; a thread beating rod having a third thread hole, the thread sequentially passes through the first thread hole, the third thread hole and the second thread hole, the thread beating rod is movably installed and controlled by the controller to change the tension of the thread.

7. The sewing apparatus according to claim 6, wherein The feed device further comprises a presser foot and a feed dog cooperating to clamp and move the fabric, the pressure of the presser foot is adjustable and controlled by the controller, and the pressure of the presser foot is linked to adjust the tension of the thread.

8. The sewing apparatus according to claim 7, wherein The sewing device further comprises: a feedback device detecting an operation signal and feeding back to the controller, so that the controller drives the fabric wheel, the presser foot and the thread clamp assembly accordingly, the operation signal is related to the movement speed of the fabric wheel, the pressure of the presser foot and the tension of the thread.

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