Lockstitch sewing machine and control method thereof

Abstract

The present application relates to the technical field of sewing machines, and in particular to a flatbed sewing machine and a control method thereof. The flatbed sewing machine control method includes adjusting the rotation speed of a driving member when the operating state of the flatbed sewing machine is any one of the starting stitch, the reverse stitch, the first stitch, the first stitch stopped midway, or the stitch length mutation state. The present application also provides a flatbed sewing machine, which is controlled by the above-mentioned flatbed sewing machine control method. Compared with the prior art, the advantage of the present application is that the rotation speed of the driving member is adjusted accordingly in any one of the starting stitch, the reverse stitch, the first stitch stopped midway, the first stitch restarted, or the stitch length mutation state, so that the adjusted stitch length will also change, and the changed stitch length is just used to compensate for the problem of unstable stitch length in any one of the starting stitch, the reverse stitch, the first stitch stopped midway, or the stitch length mutation state caused by insufficient tension of the conveyor belt.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular to a lockstitch sewing machine and a control method thereof. Background Art

[0002] The flat-bed sewing machine is one of the indispensable equipment in the textile processing industry. As people have higher and higher requirements for clothing and textiles, cutting is becoming more and more sophisticated, the requirements for processing are also increasing, and the requirements for flat-bed sewing machines are also getting higher and higher.

[0003] During the feeding process of existing flat-bed sewing machines, the conveyor belt usually becomes loose during backstitching, resulting in gaps between the conveyor belt and the driving pulley and the driven pulley. Even if a tensioning pulley is used for tensioning, the gaps between the conveyor belt and the driving pulley and the driven pulley cannot be completely eliminated. Summary of the Invention

[0004] Based on this, it is necessary to provide a lockstitch sewing machine and a control method thereof that can compensate for the gaps between the conveyor belt and the driving pulley and the driven pulley.

[0005] A control method for a flat-bed sewing machine, the flat-bed sewing machine comprising a driving member, a driving pulley, a conveyor belt, and a driven pulley, the driving pulley being connected to the driving member, the conveyor belt being sleeved on the driving pulley and the driven pulley, and conveying material under the action of the driving member; the control method for the flat-bed sewing machine comprising: adjusting the rotational speed of the driving member when the operating state of the flat-bed sewing machine is any one of starting the first stitch, reverse sewing, stopping midway to restart the first stitch, or a sudden change in stitch length.

[0006] It can be understood that by adopting the flat-bed sewing machine control method, the rotation speed of the driving member can be adjusted accordingly in any one of the states of starting the seam or the first stitch of the reverse stitch or the first stitch of the sewing machine after stopping halfway or the sudden change of the stitch length, so that the adjusted stitch length will also change. The changed stitch length is just used to compensate for the problem of unstable stitch length in any one of the states of starting the seam or the first stitch of the reverse stitch or the first stitch of the sewing machine after stopping halfway or the sudden change of the stitch length due to insufficient tension of the conveyor belt.

[0007] In one embodiment, a stitch length compensation parameter is preset according to the gap between the conveyor belt and the driving pulley and / or the gap between the conveyor belt and the driven pulley; and the rotational speed of the driving member is adjusted according to the preset stitch length compensation parameter.

[0008] In one embodiment, the control method of the flat-bed sewing machine includes the following steps: presetting a stitch length parameter; adjusting the rotation speed of the driving member according to the stitch length parameter; obtaining the positional relationship between the needle and the material on the conveyor belt, and making a judgment; if the needle is before piercing the fabric, controlling the driving member to continue running according to the stitch length parameter to maintain the material conveyance; if the needle is between piercing the fabric and rising up and leaving the material, controlling the driving member to stop running to stop the material conveyance; if the needle is after rising up and leaving the material, controlling the driving member to restart running according to the stitch length parameter to continue the material conveyance.

[0009] It can be understood that by adopting the flat-bed sewing machine control method, intermittent feeding of the flat-bed sewing machine can be achieved.

[0010] This application also provides the following technical solutions:

[0011] A flat sewing machine is controlled by the flat sewing machine control method, the flat sewing machine includes a casing assembly, a first feeding assembly and a driving member, wherein the first feeding assembly and the driving member are respectively installed on the casing assembly, and the driving member can drive the first feeding assembly to convey materials; the first feeding assembly includes a driving pulley, a conveyor belt and a driven pulley, the driven pulley is rotatably installed on the casing assembly, the driving pulley is installed on the driving member, and the conveyor belt is sleeved on the driving pulley and the driven pulley and is used to convey materials.

[0012] In one embodiment, the driven pulleys include at least two, and the two driven pulleys are arranged at intervals and located on the same horizontal plane; the conveyor belt is mounted on the driving pulley and at least two of the driven pulleys, and the portion of the conveyor belt located between at least two of the driven pulleys is used for transporting materials.

[0013] It can be understood that by setting the two driven pulleys at intervals and being located on the same horizontal plane, the smoothness of the feeding process is ensured, and when the fabric is extremely thin, the friction between the conveyor belt and the fabric helps to feed the extremely thin fabric without causing damage to the fabric; when sewing medium and thick fabrics, the feeding force for thick fabrics can also be enhanced, which helps to feed thick fabrics.

[0014] In one embodiment, the flat-bed sewing machine further includes a needle plate assembly, wherein the needle plate assembly includes a needle plate, the needle plate is fixed on the housing assembly and is provided with a transmission hole, the driven pulley is rotatably mounted on the needle plate, and a portion of the conveyor belt extends from the transmission hole to the needle plate for material transportation.

[0015] It can be understood that by opening the transmission hole on the needle plate, the installation of the driven pulley in the transmission hole is facilitated.

[0016] In one embodiment, a fixing frame is further installed in the transmission hole, the driven pulley is installed on the fixing frame, and the driven pulley is connected to the fixing frame through a fixing pin, and the driven pulley can rotate around the fixing pin.

[0017] It can be understood that by connecting the driven pulley to the fixed frame through the fixed pin, the driven pulley can rotate around the fixed pin, thereby facilitating the transmission of the conveyor belt mounted on the driven pulley to achieve the effect of feeding the cloth on the conveyor belt.

[0018] In one embodiment, the needle plate assembly further includes a push plate and a connecting plate, wherein the push plate is located at one end of the opening side of the transmission hole, and the connecting plate is overlapped between the needle plate and the push plate to connect the needle plate and the push plate.

[0019] It can be understood that by connecting and fixing the needle plate and the push plate via the connecting plate, the strength of the needle plate is enhanced.

[0020] In one embodiment, the flat-bed sewing machine further includes a needle and a presser foot assembly, both of which are mounted on the housing assembly and are capable of reciprocating motion perpendicular to the fabric feeding direction, and the presser foot assembly is used to press the fabric on the needle plate.

[0021] It can be understood that by making the presser foot assembly press the cloth on the needle plate, it is ensured that the cloth is continuously subjected to the pressing force from the presser foot assembly during the cloth feeding process, thereby preventing the cloth from deviating and affecting the stitches.

[0022] In one embodiment, the presser foot assembly includes a presser foot and a pressure rod connected to each other, the pressure rod can reciprocate in a direction perpendicular to the fabric feeding direction, the presser foot is connected to one end of the pressure rod close to the needle plate assembly, and the presser foot is used to press the fabric on the needle plate.

[0023] It can be understood that by enabling the presser rod to reciprocate perpendicularly to the fabric feeding direction, the distance between the presser foot and the needle plate can be adjusted according to the different thicknesses of the fabric.

[0024] In one embodiment, the flat-bed sewing machine further includes a needle and a second feed assembly, both of which are mounted on the housing assembly, and the needle can reciprocate perpendicular to the fabric feeding direction, and the second feed assembly can roll against the fabric on the needle plate.

[0025] It can be understood that by enabling the second feeding assembly to roll and press against the cloth on the needle plate, the upper and lower composite synchronous feeding of the flat-bed sewing machine is achieved.

[0026] In one embodiment, the second feeding assembly includes a transmission assembly and a transmission wheel connected to each other, wherein the transmission assembly is capable of driving the transmission wheel to roll against the fabric on the needle plate. The transmission assembly includes a main shaft, an eccentric wheel, an oscillating crank, a transmission shaft, and a connecting rod. The eccentric wheel is respectively fixed to the main shaft and the connecting rod, the connecting rod is connected to one end of the oscillating crank, the end of the oscillating crank away from the connecting rod is fixedly connected to the transmission shaft, and the end of the transmission shaft away from the oscillating crank is connected to the transmission wheel via a drive rod.

[0027] Compared with the prior art, the flat-bed sewing machine control method adopts the flat-bed sewing machine control method, so that the rotation speed of the driving part is adjusted accordingly in the state of the reverse stitch or stitch length mutation, so that the adjusted stitch length will also change. The changed stitch length is just used to compensate for the problem of unstable stitch length in the state of the reverse stitch or stitch length mutation caused by insufficient tension of the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic structural diagram of a lockstitch sewing machine from one perspective provided in this application;

[0030] Figure 2 A structural diagram of the lockstitch sewing machine provided in this application from another perspective;

[0031] Figure 3 This is a schematic structural diagram of one embodiment of the lockstitch sewing machine provided in this application;

[0032] Figure 4 A schematic diagram of the structure of the second feeding assembly provided in this application;

[0033] Figure 5 A schematic structural diagram of the needle plate assembly provided in this application from one perspective;

[0034] Figure 6 This is a schematic structural diagram of the needle plate assembly provided in this application from another perspective;

[0035] Figure 7Schematic diagram of the needle plate structure provided for this application;

[0036] Figure 8 A schematic diagram of the operation flow of the lockstitch sewing machine control method provided in this application;

[0037] Figure 9 A schematic diagram of the operation flow of the lockstitch sewing machine control method provided in this application;

[0038] Figure 10 This is a schematic diagram of the operating flow of the lockstitch sewing machine control method provided in this application.

[0039] 1. The present invention relates to a plurality of parts of the present invention which are specifically designed for use with a plurality of control devices, and a plurality of control devices comprising a plurality of control devices, wherein the plurality of control devices comprise a plurality of control devices, and a plurality of control devices comprise a plurality of control devices. The plurality of control devices comprise a plurality of control devices, and a plurality of control devices comprise a plurality of control devices. The plurality of control devices comprise a plurality of control devices, and a plurality of control devices comprise a plurality of control devices. DETAILED DESCRIPTION

[0040] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0041] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0045] See also Figures 1 to 10 The present application provides a flat-bed sewing machine 100, which is one of the indispensable equipment in the textile processing industry. As people have higher and higher requirements for clothing and textiles, cutting becomes more and more sophisticated, and the requirements for processing are also increasing, the requirements for the flat-bed sewing machine 100 are also getting higher and higher.

[0046] like Figure 1 As shown, the lockstitch sewing machine 100 includes a housing assembly 10, a first feeding assembly 20 and a driving member 30. The first feeding assembly 20 and the driving member 30 are respectively installed on the housing assembly 10, and the driving member 30 can drive the first feeding assembly 20 to transport the material.

[0047] In this embodiment, the driving member 30 preferably adopts a stepping motor; of course, in other embodiments, the driving member 30 may also adopt other driving mechanisms such as a cam, which is not limited here.

[0048] Furthermore, the lockstitch sewing machine 100 also includes a needle plate assembly 40, a needle 60, and a presser foot assembly 50. The housing assembly 10 includes a machine head 11 and a base plate 12, which are interconnected. The needle 60 and the presser foot assembly 50 are both mounted on the machine head 11, and the needle plate assembly 40 is mounted on the base plate 12. The needle 60 is capable of reciprocating in a direction perpendicular to the fabric feed direction. The presser foot assembly 50 includes a presser foot 51 and a pressure rod 52, which are interconnected. The pressure rod 52 is capable of reciprocating in a direction perpendicular to the fabric feed direction. The presser foot 51 is connected to the end of the pressure rod 52 near the needle plate assembly 40 and is used to press the fabric on the needle plate 41.

[0049] It should be noted that when sewing fabric, the fabric is placed on the needle plate assembly 40, and the first feeding assembly 20 transmits and feeds the fabric placed on the needle plate assembly 40. The needle 60 reciprocates in a direction perpendicular to the base plate 12 to complete the movement process of piercing the fabric and leaving the fabric. The needle 60 is connected to a sewing thread to complete the sewing of the fabric; the presser foot 51 presses on the fabric to provide a continuous pressing force on the fabric, so that the fabric is ensured not to deviate during the process of the first feeding assembly 20 feeding the fabric placed on the needle plate assembly 40, making the stitches more neat and beautiful.

[0050] In addition, the reason why a pressure rod 52 capable of reciprocating in a direction perpendicular to the base plate 12 is connected to the end of the presser foot 51 away from the base plate 12 is to facilitate adjustment of the distance between the presser foot 51 and the needle plate assembly 40. Because different fabrics have different thicknesses, it is necessary to adjust the height of the presser foot 51 according to the thickness of different fabrics to avoid the presser foot 51 being pressed tightly on the fabric, causing the fabric to be unable to be fed normally; or to avoid the presser foot 51 having no pressure on the fabric, causing the fabric to deflect.

[0051] like Figure 2 As shown, the first feeding assembly 20 includes a driving pulley 21, a conveyor belt 23 and a driven pulley 22. The driven pulley 22 is rotatably mounted on the housing assembly 10, the driving pulley 21 is mounted on the driving member 30, and the conveyor belt 23 is sleeved on the driving pulley 21 and the driven pulley 22 and is used to convey materials.

[0052] Specifically, there are at least two driven pulleys 22, and the two driven pulleys 22 are arranged at intervals and located on the same horizontal plane; the conveyor belt 23 is sleeved on the driving pulley 21 and at least two driven pulleys 22, and the part of the conveyor belt 23 located between the at least two driven pulleys 22 is used for material transmission.

[0053] It should be noted that currently, lockstitch sewing machines typically use a tooth frame to drive the feed dogs. Due to the small surface area of ​​the feed dog tips, this can often cause damage to the fabric during feeding. This is especially true when sewing medium-thick fabrics, as the increased pressure from the presser foot increases the pressure on the feed dogs, further damaging the fabric during feeding. Furthermore, when feeding extremely thin fabrics, the current feed dog feeding method can cause poor feeding and slippage.

[0054] In response to the above existing problems, the flat sewing machine 100 provided in the present application ensures the smoothness of the feeding process by setting the two driven pulleys 22 at intervals and on the same horizontal plane. As a result, when the fabric is extremely thin, the friction between the conveyor belt 23 and the fabric helps to feed the extremely thin fabric without causing damage to the fabric; when sewing medium and thick fabrics, it can also enhance the feeding force for thick fabrics, which helps to feed thick fabrics.

[0055] It is worth noting that the driven pulleys 22 include at least two, which means that the driven pulleys 22 may include two, three, four, five or even more. In this embodiment, the driven pulleys 22 include four, and the four driven pulleys 22 are all located on the same horizontal plane.

[0056] like Figure 3 and Figure 4 As shown, in one embodiment, the lockstitch sewing machine further includes a second feeding assembly 80 , which is mounted on the housing assembly 10 , and the second feeding assembly 80 can roll and press against the fabric on the needle plate 41 .

[0057] Furthermore, the second feeding assembly 80 includes a transmission assembly 81 and a transmission wheel 82 that are connected to each other. The transmission assembly 81 can drive the transmission wheel 82 to roll and press the fabric on the needle plate 41. The transmission assembly 81 includes a main shaft 811, an eccentric wheel 812, an oscillating crank 813, a transmission shaft 814, and a connecting rod 816. The eccentric wheel 812 is rotatably connected to the main shaft 811, and the eccentric wheel 812 is fixed to the connecting rod 816. The connecting rod 816 is connected to one end of the oscillating crank 813. The end of the oscillating crank 813 away from the connecting rod 816 is rotatably connected to the transmission shaft 814. The end of the transmission shaft 814 away from the oscillating crank 813 is connected to the transmission wheel 82 via a driving rod 815.

[0058] It should be noted that the eccentric wheel 812 is rotatably connected to the main shaft 811 , and the external driving mechanism drives the main shaft 811 to rotate. As the main shaft 811 rotates, the eccentric wheel 812 can be driven to rotate eccentrically. The eccentric wheel 812 is fixed on the connecting rod 816, and the connecting rod 816 is connected to the swing crank 813 for rotation, and the swing crank 813 can rotate on the connecting rod 816. The swing crank 813 is fixedly connected to the transmission shaft 814. Due to the rotational movement of the eccentric wheel 812, the connecting rod 816 can be driven to rotate back and forth within a certain range. The reciprocating rotation of the connecting rod 816 drives the swing crank 813 to swing within a certain range, so that the swing crank 813 drives the transmission shaft 814 to perform periodic reciprocating rotation. The transmission shaft 814 is hinged to the driving rod 815, and the driving shaft 814 rotates back and forth, thereby driving the driving rod 815 to move. Since the end of the driving rod 815 away from the transmission shaft 814 is connected to the transmission wheel 82, the transmission wheel 82 is driven to rotate in a circle.

[0059] It is worth noting that the first feeding assembly 20 and the second feeding assembly 80 cooperate with each other to realize the upper and lower composite synchronous feeding of the flat sewing machine 100; the advantage is that the composite feeding has a large feeding force, and the second feeding assembly 80 is used for feeding. When the cloth turns, there is no traditional presser foot to press the cloth, and the second feeding assembly 80 is used for feeding. The contact area between the transmission wheel 82 and the cloth is small, which is conducive to the realization of the turning process. In particular, for the sewing of thick fabrics, the upper and lower composite feeding is more suitable.

[0060] like Figures 5 to 7 As shown, the needle plate assembly 40 includes a needle plate 41. The needle plate 41 is fixed to the base plate 12 and defines a transmission hole 411. A fixing bracket 42 is mounted within the transmission hole 411 and secured to the wall of the transmission hole 411. The driven pulley 22 is connected to the fixing bracket 42 via a fixing pin 43, allowing the driven pulley 22 to rotate about the fixing pin 43. The conveyor belt 23 is sleeved over the driven pulley 22 and extends from the transmission hole 411 to the needle plate 41 for material transport.

[0061] Furthermore, the needle plate assembly 40 also includes a push plate 44 and a connecting plate 45. The push plate 44 is located at one end of the opening side of the transmission hole 411, and the connecting plate 45 is overlapped between the needle plate 41 and the push plate 44. The connecting plate 45, the needle plate 41 and the push plate 44 are fixedly connected by fixing screws 451, thereby enhancing the structural strength of the needle plate 41.

[0062] Since the present application adopts the transmission feeding of the conveyor belt 23, the driving pulley 21 and the driven pulley 22 to replace the feeding method of the feed dog used in the existing flat-bed sewing machine, in this embodiment, the conveyor belt 23 will usually be loose during the reverse sewing, so that a gap will be generated between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22, and even if a tensioning wheel is used for tensioning, the gap between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22 cannot be completely eliminated.

[0063] like Figure 8 As shown, in order to solve the problem of uneven stitches caused by the gap between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22. The present application also provides a lockstitch sewing machine control method, which is used to control the above-mentioned lockstitch sewing machine 100 to perform corresponding actions. Specifically, the method includes the following steps:

[0064] S1: When the operating state of the lockstitch sewing machine is any one of starting the first stitch, backstitching the first stitch, stopping midway and restarting the first stitch, or sudden change of stitch length, adjusting the rotation speed of the driving member 30.

[0065] It should be noted that the gap between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22 always exists, but when the first stitch is started or the first stitch is reversed or the sewing is stopped midway and the first stitch is restarted or the stitch length suddenly changes, the gap between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22 will affect the stitch length. At this time, it is first necessary to tension the conveyor belt 23 and the driving pulley 21 and the driven pulley 22 through the tensioning wheel assembly 70, which can adjust the gap between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22 to a certain extent. However, there is still a gap between the conveyor belt 23 and the driving pulley 21 and the driven pulley 22, so it needs to be controlled automatically in real time through electronic control.

[0066] like Figure 9 As shown, in step S1, in order to more accurately and automatically control the needle distance in real time through electronic control, the control method includes the following steps:

[0067] S11: Presetting stitch length compensation parameters according to the gap between the conveyor belt 23 and the driving pulley 21 and / or the gap between the conveyor belt 23 and the driven pulley 22;

[0068] S12: adjusting the rotation speed of the driving member 30 according to the preset stitch length compensation parameter.

[0069] It should be noted that, since the gap between the conveyor belt 23 and the active pulley 21 and the driven pulley 22 will not be the same every time in any of the states of starting the first stitch or reverse stitching or stopping midway to restart the first stitch or stitch length mutation, it is necessary to preset the stitch length compensation parameter according to the actual gap between the conveyor belt 23 and the active pulley 21 and / or the actual gap between the conveyor belt 23 and the driven pulley 22, and then use the system to determine whether the current operating state of the flat sewing machine 100 is any of the states of starting the first stitch or reverse stitching or stopping midway to restart the first stitch or stitch length mutation. If in this state, the speed of the driving member 30 is adjusted in real time according to the preset stitch length compensation parameter; for example, when a gap is generated between the conveyor belt 23 and the active pulley 21 and the driven pulley 22, the transmission speed of the conveyor belt 23 will slow down, and the stitch length will become smaller at this time. Then, the stitch length needs to be compensated at this time, and the speed of the driving member 30 needs to be increased to compensate for the smaller stitch length, so that the stitch length returns to normal.

[0070] like Figure 10 As shown, if the system determines that the machine is not in any of the states of starting the first stitch, backstitching the first stitch, stopping the machine midway to restart the first stitch, or sudden change of the stitch length, the rotation speed of the driving member 30 is adjusted according to the normal forward sewing state of the lockstitch sewing machine 100. The control method includes the following steps:

[0071] S2: preset needle distance parameters;

[0072] S3: adjusting the rotation speed of the driving member 30 according to the needle distance parameter;

[0073] S4: Obtain the positional relationship between the needle 60 and the material on the conveyor belt 23 and make a judgment;

[0074] S5: If the needle 60 is before piercing the fabric, the driving member 30 is controlled to continue running according to the needle distance parameter to maintain the material conveyance;

[0075] S6: If the needle 60 is between piercing the fabric and rising away from the fabric, the driving member 30 is controlled to stop running to stop the conveyance of the material;

[0076] S7: If the needle 60 is in the process of rising and leaving the material, the driving member 30 is controlled to restart according to the needle distance parameter to allow the material to continue to be conveyed, thereby realizing intermittent feeding of the flat-bed sewing machine 100.

[0077] The flat-bed sewing machine control method provided in the present application adopts the flat-bed sewing machine control method, so that the rotation speed of the driving part 30 is adjusted accordingly in any one of the states of starting the first stitch or the backstitch or the first stitch of the sewing is restarted after stopping halfway or the stitch length mutation state, so that the adjusted stitch length will also change. The changed stitch length is just used to compensate for the problem of unstable stitch length in any one of the states of starting the first stitch or the backstitch or the first stitch of the sewing is restarted after stopping halfway or the stitch length mutation state caused by insufficient tension of the conveyor belt 23.

[0078] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A control method for a flat-bed sewing machine, the flat-bed sewing machine comprising a driving member (30), a driving pulley (21), a conveyor belt (23), and a driven pulley (22), wherein the driving pulley (21) is connected to the driving member (30), the conveyor belt (23) is sleeved on the driving pulley (21) and the driven pulley (22), and performs material transmission under the action of the driving member (30); It is characterized in that The lockstitch sewing machine control method comprises: When the operating state of the lockstitch sewing machine is any one of starting the first stitch, backstitching the first stitch, stopping midway and restarting the first stitch, or sudden change of stitch length, adjusting the rotation speed of the driving member (30); The lockstitch sewing machine control method comprises the following steps: Presetting a stitch length compensation parameter according to a gap between the conveyor belt (23) and the driving pulley (21) and / or a gap between the conveyor belt (23) and the driven pulley (22); The rotation speed of the driving member (30) is adjusted according to a preset needle distance compensation parameter.

2. The lockstitch sewing machine control method according to claim 1, characterized in that: The lockstitch sewing machine control method comprises the following steps: Preset stitch length parameters; adjusting the rotation speed of the driving member (30) according to the needle distance parameter; Obtaining the positional relationship between the needle (60) and the material on the conveyor belt (23), and making a judgment; If the needle (60) is before piercing the fabric, the driving member (30) is controlled to continue running according to the needle distance parameter to maintain the conveyance of the material; If the needle (60) is between piercing the fabric and rising away from the fabric, the driving member (30) is controlled to stop running to stop the conveyance of the material; If the needle (60) is raised and leaves the material, the driving member (30) is controlled to run again according to the needle distance parameter to allow the material to continue to be transported.

3. A flat-bed sewing machine controlled by the flat-bed sewing machine control method according to claim 1 or 2, the flat-bed sewing machine comprising a housing assembly (10), a first feeding assembly (20) and a driving member (30), wherein: The first feeding assembly (20) and the driving member (30) are respectively mounted on the housing assembly (10), and the driving member (30) is capable of driving the first feeding assembly (20) to transport materials; It is characterized in that the first feeding assembly (20) includes a driving pulley (21), a conveyor belt (23) and a driven pulley (22), the driven pulley (22) is rotatably mounted on the housing assembly (10), the driving pulley (21) is mounted on the driving member (30), the conveyor belt (23) is sleeved on the driving pulley (21) and the driven pulley (22), and is used to convey materials.

4. The lockstitch sewing machine according to claim 3, characterized in that The driven pulleys (22) include at least two, and the two driven pulleys (22) are arranged at intervals and located on the same horizontal plane; the conveyor belt (23) is sleeved on the driving pulley (21) and at least two of the driven pulleys (22), and the portion of the conveyor belt (23) located between the at least two driven pulleys (22) is used for transporting materials.

5. The lockstitch sewing machine according to claim 3, characterized in that The flat-bed sewing machine further includes a needle plate assembly (40), wherein the needle plate assembly (40) includes a needle plate (41), the needle plate (41) is fixed on the housing assembly (10) and is provided with a transmission hole (411), the driven pulley (22) is rotatably mounted on the needle plate (41), and a portion of the conveyor belt (23) extends from the transmission hole (411) to the needle plate (41) for material transportation.

6. The lockstitch sewing machine according to claim 5, characterized in that A fixing frame (42) is also installed in the transmission hole (411), and the driven pulley (22) is installed on the fixing frame (42). The driven pulley (22) is connected to the fixing frame (42) via a fixing pin (43), and the driven pulley (22) can rotate around the fixing pin (43).

7. The lockstitch sewing machine according to claim 5, characterized in that The needle plate assembly (40) further includes a push plate (44) and a connecting plate (45), wherein the push plate (44) is located at one end of the opening side of the transmission hole (411), and the connecting plate (45) is overlapped between the needle plate (41) and the push plate (44) to connect the needle plate (41) and the push plate (44).

8. The lockstitch sewing machine according to claim 5, characterized in that The lockstitch sewing machine further comprises a machine needle (60) and a presser foot assembly (50), wherein the machine needle (60) and the presser foot assembly (50) are both mounted on the housing assembly (10), and the machine needle (60) is capable of reciprocating in a direction perpendicular to the fabric feeding direction, and the presser foot assembly (50) is used to press the fabric on the needle plate (41).

9. The lockstitch sewing machine according to claim 8, characterized in that The presser foot assembly (50) comprises a presser foot (51) and a pressure rod (52) connected to each other, wherein the pressure rod (52) can reciprocate in a direction perpendicular to the fabric feeding direction, the presser foot (51) is connected to one end of the pressure rod (52) close to the needle plate assembly (40), and the presser foot (51) is used to press the fabric on the needle plate (41).

10. The lockstitch sewing machine according to claim 5, characterized in that The lockstitch sewing machine further comprises a machine needle (60) and a second feeding assembly (80), wherein the machine needle (60) and the second feeding assembly (80) are both mounted on the housing assembly (10), and the machine needle (60) can make reciprocating motion perpendicular to the fabric feeding direction, and the second feeding assembly (80) can roll and press against the fabric on the needle plate (41).

11. The lockstitch sewing machine according to claim 10, characterized in that The second feeding assembly (80) includes a transmission assembly (81) and a transmission wheel (82) that are connected to each other, and the transmission assembly (81) can drive the transmission wheel (82) to roll and press the cloth on the needle plate (41).

12. The lockstitch sewing machine according to claim 11, characterized in that The transmission assembly (81) comprises a main shaft (811), an eccentric wheel (812), an oscillating crank (813), a transmission shaft (814) and a connecting rod (816); the eccentric wheel (812) is fixed to the main shaft (811) and the connecting rod (816), respectively; the connecting rod (816) is connected to one end of the oscillating crank (813); the end of the oscillating crank (813) away from the connecting rod (816) is fixedly connected to the transmission shaft (814); the end of the transmission shaft (814) away from the oscillating crank (813) is connected to the transmission wheel (82) via a driving rod (815).

Images