Method for switching cloth feeding movement

Abstract

The invention provides a method for switching cloth feeding motion, which comprises the following steps of: 1) rotating a presser foot lifting motor, and lifting a presser foot to the highest position; (2) a feeding motor and a feed lifting motor rotate, and a feed dog moves to the highest position; (3) the actual model of the feed dog is judged according to the image of the feed dog acquired by the camera; 4) judging the actual model of the needle plate; 5) acquiring a preset model of the needle plate matched with the actual model of the feed dog; 6) judging whether the preset model of the needle plate is the same as the actual model of the needle plate; if so, performing a step 7); if not, performing the step 8); (7) a feeding motor and a feed lifting motor are driven to rotate; 8) prompting an alarm signal; the actual model of the feed dog and the preset model of the needle plate matched with the feed dog are displayed, and the actual model of the needle plate and the preset model of the feed dog matched with the needle plate are displayed. Matched cloth feeding movement can be switched according to the replaced feed dog and the needle plate, operation is easy, and errors are not prone to occurring.

Description

Technical Field

[0001] The present invention relates to the technical field of cloth feeding methods, and in particular to a method for switching cloth feeding motions. Background Art

[0002] The power sources of existing lockstitch sewing machines are the presser foot lifter motor, the thread lifter motor, and the feed motor. The presser foot lifter motor drives the presser foot via the presser foot lifter transmission component, raising or lowering the presser foot. The feed motor drives the thread carrier via the feed component, which in turn drives the feed dog to move forward and backward. The thread lifter motor drives the thread carrier via the thread lift component, which in turn drives the feed dog to move up and down. The feed motor and thread lifter motor work together to achieve the combined motion of the feed dog.

[0003] When a flat-bed sewing machine is sewing different fabrics, different types of feed dogs need to be used to ensure better feeding performance because the materials of the fabrics are different. For example, when sewing thin and soft materials, in order to prevent the feed dogs from scratching the fabric, feed dogs with small spacing between teeth and more teeth need to be selected. When sewing thick materials, in order to improve the feeding force of the feed dogs, feed dogs with large spacing between teeth and fewer teeth need to be selected. At the same time, different models of feed dogs need to be matched with different sizes of needle plates due to their size differences. Therefore, replacing the feed dogs and needle plates on the flat-bed sewing machine is a frequent operation when changing styles and materials.

[0004] After replacing the feed dog and needle plate, the height and front-to-back position of the feed dog change relative to the connected tooth holder. At this time, if the feed dog moves according to the original transmission motion, the feed dog will cause the feed dog to interfere with the edge of the needle plate groove of the needle plate when the needle length is above 4mm. At the same time, the change in the height of the feed dog will lead to a decrease in the feeding performance. Therefore, in a flat-bed sewing machine that realizes the feeding motion driven by a motor, multiple sets of motion programs are required to achieve the appropriate matching of the feed dog and the needle plate.

[0005] Therefore, replacing the feed dogs, needle plate, and switching the matching feed motion requires highly specialized mechanics or sewing operators. If the matching needle plate or feed motion is not correctly replaced after the feed dogs are replaced, feeding performance may be reduced or even the feed dog motion may interfere, causing damage to the sewing machine. Currently, sewing machine operators must visually confirm that the feed dogs and needle plate are correctly aligned, and then select the corresponding feed motion program on the sewing machine's control panel. This method relies on manual inspection and operation, which is complex and prone to errors for sewing operators.

[0006] How to design a method for switching the feeding motion that can be matched according to the replaced feed dog and needle plate, and which is simple to operate and not prone to errors is a problem that technicians in this field need to solve. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a method for switching the feed motion that can be matched according to the replaced feed dog and needle plate, and which is simple to operate and not prone to errors.

[0008] In order to solve the above technical problems, the present invention provides a method for switching cloth feeding motion, comprising the following steps:

[0009] 1) The presser foot lifting motor of the sewing machine rotates, and the presser foot lifting motor drives the presser foot through the presser foot lifting transmission component, so that the presser foot is raised to the highest position;

[0010] 2) The feeding motor and the tooth lifting motor rotate, the feeding motor drives the tooth frame through the feeding component, and the tooth frame drives the feed dog to move; the tooth lifting motor drives the tooth frame through the tooth lifting component, and the tooth frame drives the feed dog to move, so that the feed dog moves to the highest position;

[0011] 3) The camera transmits the image of the feed dog to an image processing device. The image processing device processes the image of the feed dog and transmits the identified characteristic information of the feed dog to a controller. The controller determines the actual model of the feed dog based on the characteristic information of the feed dog.

[0012] 4) The camera sends the acquired image of the needle plate to the image processing device. The image processing device processes the image of the needle plate and transmits the identified characteristic information of the needle plate to the controller. The controller determines the actual model of the needle plate based on the characteristic information of the needle plate.

[0013] 5) The controller obtains a preset model of the needle plate that matches the actual model of the feed dog;

[0014] 6) The controller determines whether the preset model of the needle plate is the same as the actual model of the needle plate; if the preset model of the needle plate is the same as the actual model of the needle plate, proceed to step 7); if the preset model of the needle plate is not the same as the actual model of the needle plate, proceed to step 8);

[0015] 7) The controller obtains the corresponding operating parameters of the feed motor and the tooth lifting motor according to the actual model of the feed dog and the actual model of the needle plate, and the controller drives the feed motor to rotate according to the obtained operating parameters of the feed motor. The controller drives the tooth lifting motor to rotate according to the obtained operating parameters of the tooth lifting motor, and the sewing machine starts feeding;

[0016] 8) The controller controls the alarm device to prompt an alarm signal; the controller transmits the preset model of the needle plate that matches the actual model of the feed dog to the display device; the controller transmits the preset model of the feed dog that matches the actual model of the needle plate to the display device; the display device displays the actual model of the feed dog and the preset model of the needle plate that matches it, and the display device displays the actual model of the needle plate and the preset model of the feed dog that matches it.

[0017] Preferably, the characteristic information of the feed dog includes the number of teeth of the feed dog and the distance from the first tooth to the last tooth of the feed dog.

[0018] Preferably, the characteristic information of the needle board includes the length of the needle board groove and the characteristic pattern of the surface of the needle board.

[0019] Preferably, the camera is arranged on the sewing machine.

[0020] Preferably, the needle plate is connected to the bottom plate of the sewing machine.

[0021] As described above, the method for switching the cloth feeding motion of the present invention has the following beneficial effects:

[0022] The method for switching the cloth feeding motion uses a camera to capture images of the feed dog and the needle plate, an image processing device processes the images of the feed dog and the needle plate, and identifies characteristic information of the feed dog and the needle plate. A controller determines the actual models of the feed dog and the needle plate based on the characteristic information of the feed dog and the needle plate, switches the operating parameters of the feeding motor and the lifting motor to match, and then the sewing machine starts feeding motion. When the feed dog and the needle plate do not match, an alarm signal is prompted by an alarm device, thereby improving the automation level of the sewing machine. The present invention is a method for switching the cloth feeding motion that can switch the matching cloth feeding motion according to the replaced feed dog and needle plate, and is simple to operate and not prone to errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic three-dimensional structure diagram of the sewing machine of this embodiment.

[0024] Figure 2 Display as Figure 1 Schematic diagram of the enlarged structure at A.

[0025] Figure 3 Shown is a schematic three-dimensional structure diagram of the presser foot lifting motor, feed motor and thread lifting motor inside the sewing machine of this embodiment.

[0026] Figure 4 It is a schematic structural diagram showing the feed dog of the sewing machine of this embodiment inserted into the needle plate groove.

[0027] Figure 5 Shown is a schematic structural diagram of the feed dog of this embodiment.

[0028] Figure 6 Shown is a schematic structural diagram of the needle plate of this embodiment.

[0029] Figure 7 Shown is a logic diagram of the method for switching the cloth feeding motion of this embodiment.

[0030] Figure 8 Shown is a schematic diagram of a control system for switching cloth feeding motion adopted by the method for switching cloth feeding motion of this embodiment under the control of a controller.

[0031] Explanation of Figure Numbers

[0032] 100 sewing machines

[0033] 101 Upper Case

[0034] 111 Presser foot lift motor

[0035] 112 Presser foot lift transmission parts

[0036] 113 presser foot

[0037] 121 Feeding motor

[0038] 122 Feeding parts

[0039] 123 dental bracket

[0040] 124 Feed dog

[0041] 1241 Teeth

[0042] 131 tooth lifting motor

[0043] 132 Tooth lift parts

[0044] 141 needle plate

[0045] 1411 Needle plate groove

[0046] 1412 characteristic pattern

[0047] 151 base plate

[0048] 200 cameras

[0049] 300 Image Processing Device

[0050] 400 controller

[0051] 500 alarm device

[0052] 600 display device

[0053] L Distance from the first tooth to the last tooth

[0054] S Length of the throat plate slot DETAILED DESCRIPTION

[0055] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0056] Please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0057] like Figures 1 to 8 As shown, the method for switching the cloth feeding motion of this embodiment includes the following steps:

[0058] 1) The presser foot lifting motor 111 of the sewing machine 100 rotates, and the presser foot lifting motor 111 drives the presser foot 113 through the presser foot lifting transmission component 112, so that the presser foot 113 is raised to the highest position;

[0059] 2) The feed motor 121 and the tooth lifting motor 131 rotate, the feed motor 121 drives the tooth frame 123 through the feed component 122, and the tooth frame 123 drives the feed dog 124 to move; the tooth lifting motor 131 drives the tooth frame 123 through the tooth lifting component 132, and the tooth frame 123 drives the feed dog 124 to move, so that the feed dog 124 moves to the highest position;

[0060] 3) The camera 200 transmits the captured image of the feed dog 124 to the image processing device 300. The image processing device 300 processes the image of the feed dog 124 and transmits the identified characteristic information of the feed dog 124 to the controller 400. The controller 400 determines the actual model of the feed dog 124 based on the characteristic information of the feed dog 124.

[0061] 4) The camera 200 sends the acquired image of the needle plate 141 to the image processing device 300. The image processing device 300 processes the image of the needle plate 141 and transmits the identified characteristic information of the needle plate 141 to the controller 400. The controller 400 determines the actual model of the needle plate 141 based on the characteristic information of the needle plate 141.

[0062] 5) The controller 400 obtains a preset model of the needle plate 141 that matches the actual model of the feed dog 124;

[0063] 6) The controller 400 determines whether the preset model of the needle plate 141 is the same as the actual model of the needle plate 141; if the preset model of the needle plate 141 is the same as the actual model of the needle plate 141, step 7) is performed; if the preset model of the needle plate 141 is not the same as the actual model of the needle plate 141, step 8) is performed;

[0064] 7) The controller 400 obtains the corresponding operating parameters of the feed motor 121 and the tooth lifting motor 131 according to the actual model of the feed dog 124 and the actual model of the needle plate 141. The controller 400 drives the feed motor 121 to rotate according to the obtained operating parameters of the feed motor 121. The controller 400 drives the tooth lifting motor 131 to rotate according to the obtained operating parameters of the tooth lifting motor 131. The sewing machine 100 starts feeding and starts sewing.

[0065] 8) The controller 400 controls the alarm device 500 to prompt an alarm signal; the controller 400 transmits the preset model of the needle plate 141 that matches the actual model of the feed dog 124 to the display device 600, and the controller 400 transmits the preset model of the feed dog 124 that matches the actual model of the needle plate 141 to the display device 600; the display device 600 displays the actual model of the feed dog 124 and the preset model of the needle plate 141 that matches it, and the display device 600 displays the actual model of the needle plate 141 and the preset model of the feed dog 124 that matches it.

[0066] The method for switching the cloth feeding motion captures images of the feed dog 124 and the needle plate 141 through a camera 200, and identifies characteristic information of the feed dog 124 and the needle plate 141 after processing the images of the feed dog 124 and the needle plate 141 through an image processing device 300. The controller 400 determines the actual model of the feed dog 124 and the needle plate 141 based on the characteristic information of the feed dog 124 and the needle plate 141, switches the operating parameters of the feeding motor 121 and the lifting motor 131 to match, and then the sewing machine 100 starts feeding motion; and when the feed dog 124 and the needle plate 141 do not match, the alarm device 500 prompts an alarm signal, thereby improving the automation level of the sewing machine 100. The present invention is a method for switching the cloth feeding motion that can switch the matching cloth feeding motion according to the replaced feed dog 124 and needle plate 141, and is simple to operate and not prone to errors.

[0067] In step 1), the presser foot 113 rises to the highest position, which enables the camera 200 to capture the needle plate 141 ; in step 2), the feed dog 124 moves to the highest position, which enables the camera 200 to capture the feed dog 124 .

[0068] The camera 200 is mounted on the upper housing 101 of the sewing machine 100 , and the shooting direction of the camera 200 faces the feed dog 124 and the needle plate 141 , and the feature information of the feed dog 124 and the needle plate 141 is obtained through the image processing device 300 .

[0069] In this embodiment, the sewing machine 100 is a flat sewing machine. The feed dog 124 is fixedly connected to the tooth holder 123 by screws, and the needle plate 141 is connected to the bottom plate 151 of the sewing machine 100 by screws. Since the height dimensions of the parts of different feed dogs 124 are different, it is necessary to replace the needle plate 141 with a height matching. At the same time, since the positions of the needle plate slots 1411 of different needle plates 141 are different, in order to avoid the interference between the movement of the feed dog 124 and the needle plate 141 when the stitch length is large. If the existing technology is used to feed the cloth with the main shaft power source, it is necessary to adjust the installation angle of the tooth holder seat so that the feed dog 124 is located at the center of the needle plate slot 1411. However, the movement of the position of the feed dog 124 will cause the movement trajectory of the feed dog 124 to be deformed, the height of the feed dog 124 and the movement matching of the feed dog 124 and other moving parts to change. Therefore, although the feed dog 124 can move normally in this operation, there will be problems such as broken needles and reduced feed force during sewing. Figure 3 As shown, the cloth feeding motion structure using the tooth lifting motor 131 and the feeding motor 121 as the power source can complete the movement of the feed dog 124 to the center position of the needle plate groove 1411 by rotating the tooth lifting motor 131 and the feeding motor 121 that match the feed dog 124 and the needle plate 141, while ensuring that the motion trajectory of the feed dog 124, the height of the feed dog 124 and the motion matching of the feed dog 124 and other moving parts are normal.

[0070] like Figures 1 to 8 As shown, in order to facilitate identification of characteristic information of the feed dog 124 , the characteristic information of the feed dog 124 includes the number of teeth of the feed dog 124 and the distance L from the first tooth 1241 to the last tooth 1241 of the feed dog 124 .

[0071] To facilitate identification of characteristic information of the needle plate 141 , the characteristic information of the needle plate 141 includes a length S of the needle plate groove 1411 and a characteristic pattern 1412 on the surface of the needle plate 141 .

[0072] In step 3), the controller 400 determines the actual model of the feed dog 124 according to the characteristic information of the feed dog 124 based on the following Table 1, which shows the correspondence between the characteristic information of the feed dog 124 and the model of the feed dog 124.

[0073] Table 1: Correspondence between the feed dog's characteristic information and the feed dog's model

[0074]

[0075] In step 4), the controller 400 determines the actual model of the needle plate 141 according to the characteristic information of the needle plate 141 based on the following Table 2, which shows the correspondence between the characteristic information of the needle plate 141 and the model of the needle plate 141.

[0076] Table 2: Correspondence between needle plate characteristic information and needle plate model

[0077]

[0078]

[0079] In step 7), the controller 400 obtains the corresponding operating parameters of the feed motor 121 and the tooth lifting motor 131 according to the actual model of the feed dog 124 and the actual model of the needle plate 141, based on the following Table 3, which shows the correspondence between the characteristic information of the feed dog 124, the characteristic information of the needle plate 141 and the operating parameters of the feed motor 121 and the tooth lifting motor 131.

[0080] Table 3: Feed dog model, needle plate model and motor motion matching relationship

[0081] Feed dog characteristic information Needle plate characteristic information Operating parameters of feeding motor and tooth lifting motor Y1 Z1 R1 … … … Yn Zn Rn

[0082] The control system for switching the cloth feed motion used in the method includes a controller 400, a camera 200, an image processing device 300, an alarm device 500, and a display device 600. The camera 200, the image processing device 300, the alarm device 500, and the display device 600 are all connected to the controller 400, and the presser foot lifting motor 111, the feed motor 121, and the tooth lifting motor 131 are all connected to the controller 400. This method for switching the cloth feed motion avoids the error-prone problems caused by cumbersome manual operations in the past.

[0083] In summary, this embodiment effectively overcomes various shortcomings of the prior art and has high industrial application value.

[0084] The above embodiments are merely illustrative of the principles and effects of the present embodiments and are not intended to limit the present embodiments. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present embodiments. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical concepts disclosed in the present embodiments are intended to be covered by the claims of the present embodiments.

Claims

1. A method for switching cloth feeding motion, characterized in that: The following steps are involved: 1) The presser foot lifting motor (111) of the sewing machine (100) rotates, and the presser foot lifting motor (111) drives the presser foot (113) through the presser foot lifting transmission component (112), so that the presser foot (113) is raised to the highest position; 2) the feeding motor (121) and the tooth-lifting motor (131) rotate, the feeding motor (121) drives the tooth frame (123) through the feeding component (122), and the tooth frame (123) drives the feed dog (124) to move; the tooth-lifting motor (131) drives the tooth frame (123) through the tooth-lifting component (132), and the tooth frame (123) drives the feed dog (124) to move, so that the feed dog (124) moves to the highest position; 3) the camera (200) transmits the acquired image of the feed dog (124) to the image processing device (300); the image processing device (300) processes the image of the feed dog (124) and transmits the identified characteristic information of the feed dog (124) to the controller (400); the controller (400) determines the actual model of the feed dog (124) based on the characteristic information of the feed dog (124); 4) The camera (200) sends the acquired image of the needle plate (141) to the image processing device (300), and the image processing device (300) transmits the identified characteristic information of the needle plate (141) after performing image processing on the image of the needle plate (141) to the controller (400), and the controller (400) determines the actual model of the needle plate (141) based on the characteristic information of the needle plate (141); 5) the controller (400) obtains a preset model of the needle plate (141) that matches the actual model of the feed dog (124); 6) The controller (400) determines whether the preset model of the needle plate (141) is the same as the actual model of the needle plate (141); when the preset model of the needle plate (141) is the same as the actual model of the needle plate (141), step 7) is performed; when the preset model of the needle plate (141) is not the same as the actual model of the needle plate (141), step 8) is performed; 7) The controller (400) obtains the corresponding operating parameters of the feed motor (121) and the tooth lifting motor (131) according to the actual model of the feed dog (124) and the actual model of the needle plate (141), and the controller (400) drives the feed motor (121) to rotate according to the obtained operating parameters of the feed motor (121), and the controller (400) drives the tooth lifting motor (131) to rotate according to the obtained operating parameters of the tooth lifting motor (131), and the sewing machine (100) starts feeding; 8) The controller (400) controls the alarm device (500) to prompt an alarm signal; the controller (400) transmits the preset model of the needle plate (141) that matches the actual model of the feed dog (124) to the display device (600), and the controller (400) transmits the preset model of the feed dog (124) that matches the actual model of the needle plate (141) to the display device (600); the display device (600) displays the actual model of the feed dog (124) and the preset model of the needle plate (141) that matches it, and the display device (600) displays the actual model of the needle plate (141) and the preset model of the feed dog (124) that matches it.

2. The method for switching cloth feeding motion according to claim 1, characterized in that: The characteristic information of the feed dog (124) includes the number of teeth of the feed dog (124) and the distance from the first tooth (1241) to the last tooth (1241) of the feed dog (124).

3. The method for switching cloth feeding motion according to claim 1, characterized in that: The characteristic information of the needle plate (141) includes the length of the needle plate groove (1411) and the characteristic pattern (1412) on the surface of the needle plate (141).

4. The method for switching cloth feeding motion according to claim 1, characterized in that: The camera (200) is arranged on the sewing machine (100).

5. The method for switching cloth feeding motion according to claim 1, characterized in that: The needle plate (141) is connected to the bottom plate (151) of the sewing machine (100).

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