Method for switching a fabric feeding motion

Abstract

The present application provides a method for switching the feeding motion, comprising the following steps: 1) moving the feeding dog to the highest position, and the sensor detects the height of the highest position of the presser foot and the presser foot pressure at the highest position; 2) moving the feeding dog to the lowest position, and the sensor detects the height of the lowest position of the presser foot and the presser foot pressure at the lowest position; 3) calculating the actual distance between the presser foot and the needle plate and the actual pressure difference of the presser foot; 4) when the actual distance between the presser foot and the needle plate meets the preset distance between the presser foot and the needle plate, and the actual pressure difference of the presser foot meets the preset pressure difference of the presser foot, step 5) is performed; when the actual distance between the presser foot and the needle plate does not meet the preset distance between the presser foot and the needle plate, or the actual pressure difference of the presser foot does not meet the preset pressure difference of the presser foot, step 6) is performed; 5) driving the lifting dog motor and the feeding motor to rotate; 6) prompting the warning information to be transmitted to the display device. The present application can switch the feeding motion according to the matching of the feeding dog and the needle plate.

Description

Technical Field

[0001] This invention relates to the field of fabric feeding methods, and in particular to a method for switching fabric feeding motions. Background Technology

[0002] The existing power sources for flat sewing machines are a presser foot lifting motor, a feed dog lifting motor, and a feed motor. The presser foot lifting motor drives the presser foot through a presser foot lifting transmission component, which includes a transmission rod component and a presser rod connected in sequence. The transmission input part of the transmission rod component is connected to the output end of the presser foot lifting motor, and the transmission output part of the transmission rod component is connected to the upper end of the presser rod. The lower end of the presser rod is connected to the presser foot. The upper end of the presser rod is sleeved on a fixed guide rod, and a fixed sleeve is sleeved on the upper end of the guide rod. The fixed sleeve and the presser rod are connected by an adjusting spring, which is sleeved on the guide rod. The pressure generated by the presser rod driving the adjusting spring to compress is the presser foot pressure. The feed motor drives the feed dog through a feed component, causing the feed dog to move back and forth. The feed dog lifting motor drives the feed dog through a feed dog lifting component, causing the feed dog to move up and down. Thus, the feed motor and the feed dog lifting motor work together to synthesize the movement of the feed dog.

[0003] When sewing different fabrics, flatbed sewing machines require different types of feed dogs to ensure good feeding performance because of the different fabric materials. For example, when sewing thin and soft materials, feed dogs with small spacing and many teeth are needed to avoid scratching the fabric. When sewing thick materials, feed dogs with large spacing and few teeth are needed to increase the feeding force. At the same time, different models of feed dogs require different sizes of needle plates due to size differences. Therefore, changing feed dogs and needle plates on flatbed sewing machines is a frequent operation when changing models or 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 feed dog frame. If the feed dog moves according to the original transmission motion, there is a risk that the feed teeth of the feed dog will interfere with the edge of the needle plate groove when the stitch pitch is above 4mm. At the same time, the change in the height of the feed dog will reduce the feeding performance. Therefore, in a flat sewing machine that uses a motor to drive the feeding motion, multiple motion programs are needed to achieve a suitable match between the feed dog and the needle plate.

[0005] Therefore, replacing the feed dog, needle plate, and switching the matching feed motion requires highly specialized mechanic or sewing machine operator skills. If the matching needle plate or feed motion is not correctly replaced after replacing the feed dog, reduced feeding performance or even feed dog interference can lead to sewing machine damage. Currently, sewing machine operation requires the operator to visually inspect the feed dog and needle plate to confirm their correctness, 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 the operator.

[0006] How to design a method that can switch the matching feed motion according to the changed feed teeth, and is simple to operate and not prone to errors in switching the feed motion is a problem that needs to be solved by those skilled in the art. 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 feeding motion according to the feeding teeth, which is simple to operate and less prone to errors.

[0008] To solve the above-mentioned technical problems, the present invention provides a method for switching fabric feeding motion, comprising the following steps:

[0009] 1) The lifting motor rotates, and the lifting motor drives the tooth frame through the lifting component. The tooth frame drives the feed tooth to move, so that the feed tooth moves to the highest position and the presser foot presses on the feed tooth. The pressure generated by the pressure rod driving the pressure regulating spring to compress is the presser foot pressure. At this time, the height of the presser foot position is the height of the highest position of the presser foot, and the presser foot pressure is the presser foot pressure at the highest position. The sensor detects the height of the highest position of the presser foot and the presser foot pressure at the highest position.

[0010] 2) The lifting motor drives the tooth frame through the lifting component, and the tooth frame drives the feed tooth to move, so that the feed tooth moves to the lowest position and the presser foot presses on the needle plate. At this time, the height of the presser foot position is the lowest position height of the presser foot, and the presser foot pressure is the presser foot pressure at the lowest position. The sensor detects the lowest position height of the presser foot and the presser foot pressure at the lowest position.

[0011] 3) The controller calculates the actual distance between the presser foot and the needle plate and the actual pressure difference between the presser foot and the needle plate. The actual distance between the presser foot 200 and the needle plate 300 is the difference between the height of the presser foot at its highest position and the height of the presser foot at its lowest position. The actual pressure difference between the presser foot and the presser foot is the difference between the pressure of the presser foot at its highest position and the pressure of the presser foot at its lowest position.

[0012] 4) When the controller determines that the actual distance between the presser foot and the needle plate matches the preset distance between the presser foot and the needle plate, and the controller determines that the actual pressure difference of the presser foot matches the preset pressure difference of the presser foot, then proceed to step 5); when the controller determines that the actual distance between the presser foot and the needle plate does not match the preset distance between the presser foot and the needle plate, or the controller determines that the actual pressure difference of the presser foot does not match the preset pressure difference of the presser foot, then proceed to step 6).

[0013] 5) The controller obtains the corresponding operating parameters of the feed motor and the lifting tooth motor based on the actual distance between the presser foot and the needle plate and the actual pressure difference of the presser foot. The controller drives the feed motor to rotate based on the obtained operating parameters of the feed motor and drives the lifting tooth motor to rotate based on the obtained operating parameters of the lifting tooth motor. The sewing machine then begins to feed.

[0014] 6) The controller will send a warning message to the display device, and the display device will show the warning message as: there is a mismatch between the feed dog and the needle plate.

[0015] Preferably, the presser foot lifting motor drives the presser foot through a presser foot lifting transmission component. The presser foot lifting transmission component includes a transmission rod component and a presser rod connected in sequence. The transmission input part of the transmission rod component is connected to the output end of the presser foot lifting motor, and the transmission output part of the transmission rod component is connected to the upper end of the presser rod. The lower end of the presser rod is connected to the presser foot. The upper end of the presser rod is sleeved on the fixedly installed guide rod. The upper end of the guide rod is sleeved with a fixing sleeve. The fixing sleeve and the presser rod are connected by an adjusting spring, which is sleeved on the guide rod.

[0016] Preferably, the sensors that detect the lowest and highest positions of the presser foot are position sensors.

[0017] Preferably, the sensors that detect the pressure of the presser foot at the lowest position and the pressure of the presser foot at the highest position are gravity sensors.

[0018] As described above, the method for switching the fabric feeding motion of the present invention has the following beneficial effects:

[0019] This method for switching the feed motion addresses the issue that different models of needle plates and feed dogs have varying heights. Therefore, after replacing the needle plate and feed dog, the actual distance between the presser foot and needle plate differs when the feed dog reaches its highest position. A sensor can detect this actual distance to determine the operating parameters of the matching feed motor and feed dog motor, thus switching their motions. Similarly, because the presser foot is fixedly connected to the presser bar, the pressure generated by the presser bar driving the adjusting spring is the presser foot pressure. A sensor can detect this pressure to determine the operating parameters of the matching feed motor and feed dog motor, switching their motions to initiate the feed motion. Furthermore, an alarm signal is triggered when the feed dog and needle plate are mismatched, improving the automation level of the sewing machine. This invention provides a simple and error-free method for switching the feed motion based on the replaced feed dog. Attached Figure Description

[0020] Figure 1 The diagram shown is a three-dimensional internal structure diagram of the sewing machine in this embodiment.

[0021] Figure 2 Displayed as Figure 1 An enlarged structural diagram of point A.

[0022] Figure 3 Displayed as Figure 1 A magnified structural diagram at point C.

[0023] Figure 4 The diagram shown is a logic diagram of the method for switching fabric feeding motion in this embodiment.

[0024] Figure 5 The diagram shown is a schematic of the control system for the switching fabric feeding motion used in the method of switching fabric feeding motion in this embodiment, under the control of the controller.

[0025] Figure 6 This is a schematic diagram showing the structure when the feed dog and the presser foot are in contact in this embodiment.

[0026] Figure 7 The diagram shown illustrates the movement trajectory of the feed teeth in this embodiment.

[0027] Explanation of icon numbers

[0028] 110 Tooth Lifting Motor

[0029] 120 Tooth Lifting Components

[0030] 130 dental frame

[0031] 140 Delivery of cloth teeth

[0032] 200 presser foot

[0033] 300 needle plate

[0034] 400 controller

[0035] 510 Feeding Motor

[0036] 520 Feeding Parts

[0037] 700 display device

[0038] 810 Lifting foot motor

[0039] 820 Presser foot transmission component

[0040] 821 Transmission rod assembly

[0041] 822 Compression Rod

[0042] 830 Guide Rod

[0043] 840 fixing sleeve

[0044] 850 Adjustable spring

[0045] 910 Position Sensor

[0046] 920 Gravity Sensor

[0047] H1 Presser foot lowest position height

[0048] F1 Lowest position presser foot pressure

[0049] H2 Presser foot maximum position height

[0050] F2 highest position presser foot pressure

[0051] H. Actual distance between presser foot and needle plate

[0052] F. Actual pressure difference of the presser foot

[0053] B Elliptical trajectory Detailed Implementation

[0054] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0055] Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0056] like Figures 1 to 7 As shown, the method for switching the fabric feeding motion in this embodiment includes the following steps:

[0057] 1) Upon receiving the feed dog 140 replacement detection signal, the tooth lifting motor 110 rotates. The tooth lifting motor 110 drives the tooth frame 130 through the tooth lifting component 120. The tooth frame 130 drives the feed dog 140 to move, so that the feed dog 140 moves to the highest position. The pressure foot 200 presses on the feed dog 140. The pressure rod 822 drives the pressure regulating spring 850 to compress, and the pressure generated is the pressure foot 200 pressure. At this time, the height of the pressure foot 200 is the highest position height H2 of the pressure foot 200, and the pressure of the pressure foot 200 is the pressure F2 of the pressure foot 200 at the highest position. The sensor detects the highest position height H2 of the pressure foot 200 and the pressure F2 of the pressure foot 200 at the highest position.

[0058] 2) The lifting tooth motor 110 drives the tooth frame 130 through the lifting tooth component 120, and the tooth frame 130 drives the feed tooth 140 to move, so that the feed tooth 140 moves to the lowest position, and the presser foot 200 presses on the needle plate 300. At this time, the height of the presser foot 200 is the lowest position height H1 of the presser foot 200, and the pressure of the presser foot 200 is the lowest position pressure F1 of the presser foot 200. The sensor detects the lowest position height H1 of the presser foot 200 and the lowest position pressure F1 of the presser foot 200.

[0059] 3) The controller 400 calculates the actual distance H between the presser foot 200 and the needle plate 300 and the actual pressure difference F between the presser foot and the needle plate 300. The actual distance H between the presser foot 200 and the needle plate 300 is the difference between the height H2 of the highest position of the presser foot 200 and the height H1 of the lowest position of the presser foot 200. The actual pressure difference F is the difference between the pressure F2 of the presser foot 200 at the highest position and the pressure F1 of the presser foot 200 at the lowest position.

[0060] 4) When the controller 400 determines that the actual distance H between the presser foot 200 and the needle plate 300 conforms to the preset distance between the presser foot 200 and the needle plate 300, and the controller 400 determines that the actual pressure difference F of the presser foot conforms to the preset pressure difference of the presser foot 200, then proceed to step 5); when the controller 400 determines that the actual distance H between the presser foot 200 and the needle plate 300 does not conform to the preset distance between the presser foot 200 and the needle plate 300, or the controller 400 determines that the actual pressure difference F of the presser foot does not conform to the preset pressure difference of the presser foot 200, then proceed to step 6);

[0061] 5) The controller 400 obtains the operating parameters of the feed motor 510 and the lifting tooth motor 110 according to the actual distance H between the presser foot 200 and the needle plate 300 and the actual pressure difference F of the presser foot. The controller 400 drives the feed motor 510 to rotate according to the obtained operating parameters of the feed motor 510. The controller 400 drives the lifting tooth motor 110 to rotate according to the obtained operating parameters of the lifting tooth motor 110. The sewing machine starts to feed and starts sewing.

[0062] 6) The controller 400 will send a warning message to the display device 700, and the display device 700 will display the message: there is a mismatch between the feed dog 140 and the needle plate 300.

[0063] This method of switching the feed motion only involves rotating the lifting tooth motor 110 to complete the zero-stitch feed motion. Because the height dimensions of the needle plate 300 and feed tooth 140 differ between different models, the actual distance H between the presser foot 200 and the needle plate 300 is different when the feed tooth 140 reaches its highest position after replacing the needle plate 300 and feed tooth 140. Therefore, the actual distance H between the presser foot 200 and the needle plate 300 at this time can be detected by a sensor to determine the operating parameters of the matching feed motor 510 and lifting tooth motor 110, thereby switching the motion of the lifting tooth motor 110 and the feed motor 510. Similarly, because the presser foot 200 is fixedly connected to the presser rod 822... Next, the pressure generated by the compression of the pressure regulating spring 850 driven by the pressure rod 822 becomes the pressure of the presser foot 200. Therefore, the operating parameters of the matching feed motor 510 and the lifting tooth motor 110 can be determined by the sensor detecting the pressure of the presser foot 200, so as to switch the movement of the lifting tooth motor 110 and the feed motor 510, so that the sewing machine can start the feeding movement. In addition, when the feed dog 140 and the needle plate 300 are mismatched, an alarm signal is given through the alarm device, which improves the automation level of the sewing machine. This invention is a method for switching the matching feeding movement according to the changed feed dog 140 and needle plate 300, which is simple to operate and not prone to errors.

[0064] The presser foot motor 810 drives the presser foot 200 via a presser foot transmission component 820. The presser foot transmission component 820 includes a transmission rod component 821 and a presser rod 822 connected in sequence. The transmission input part of the transmission rod component 821 is connected to the output end of the presser foot motor 810, and the transmission output part of the transmission rod component 821 is connected to the upper end of the presser rod 822. The lower end of the presser rod 822 is connected to the presser foot 200. The upper end of the presser rod 822 is sleeved on a fixedly installed guide rod 830. A fixing sleeve 840 is fitted onto the upper end of the guide rod 830. The fixing sleeve 840 and the presser rod 822 are connected by a pressure adjusting spring 850, which is sleeved on the guide rod 830. This structure facilitates the movement of the presser rod 822 along the guide rod 830. The movement of the presser rod 822 causes the pressure adjusting spring 850 to extend and retract. The pressure generated by the presser rod 822 driving the pressure adjusting spring 850 to compress is the pressure of the presser foot 200.

[0065] To facilitate driving the feed dog 140, the lifting motor 110 drives the feed dog frame 130 via the lifting component 120, causing the feed dog frame 130 to move up and down. The feeding motor 510 drives the feed dog frame 130 via the feeding component 520, causing the feed dog frame 130 to move back and forth. In this embodiment, the movement trajectory of the feed dog 140 is... Figure 6 The elliptical trajectory B in the diagram.

[0066] like Figures 1 to 7 As shown, the sensor that detects the lowest position height H1 and the highest position height H2 of the presser foot 200 is a position sensor 910, and the sensor that detects the pressure F1 of the presser foot 200 at the lowest position and the pressure F2 of the presser foot 200 at the highest position is a gravity sensor 920. The position sensor 910 can acquire the height value, and the gravity sensor 920 can acquire the pressure of the presser foot 200.

[0067] The control system for switching the fabric feeding motion includes a controller 400, a position sensor 910, a gravity sensor 920, and a display device 700. The position sensor 910, the gravity sensor 920, and the display device 700 are all connected to the controller 400, and the presser foot motor 810, the feed motor 510, and the tooth lifting motor 110 are all connected to the controller 400.

[0068] The system automatically detects the matching status of the feed dog 140 and the needle plate 300 using multiple sensors. After the detection is completed, it can automatically switch the movement of the matching feed motor, avoiding the error-prone problems caused by the cumbersome manual operation in the past.

[0069] In summary, this embodiment effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0070] The above embodiments are merely illustrative of the principles and effects of this embodiment and are not intended to limit this embodiment. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this embodiment. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this embodiment should still be covered by the claims of this embodiment.

Claims

1. A method for switching fabric feeding motion, characterized in that, Includes the following steps: 1) The lifting tooth motor (110) rotates, and the lifting tooth motor (110) drives the tooth frame (130) through the lifting tooth component (120). The tooth frame (130) drives the feed tooth (140) to move, so that the feed tooth (140) moves to the highest position. The presser foot (200) presses on the feed tooth (140). The pressure generated by the pressure rod (822) driving the pressure adjusting spring (850) to compress is the pressure of the presser foot (200). At this time, the height of the presser foot (200) is the height of the highest position of the presser foot (200), and the pressure of the presser foot (200) is the pressure of the presser foot (200) at the highest position. The sensor detects the height of the highest position of the presser foot (200) and the pressure of the presser foot (200) at the highest position. 2) The lifting tooth motor (110) drives the tooth frame (130) through the lifting tooth component (120), and the tooth frame (130) drives the feed tooth (140) to move, so that the feed tooth (140) moves to the lowest position, and the presser foot (200) presses on the needle plate (300). At this time, the height of the presser foot (200) is the lowest position height of the presser foot (200), and the pressure of the presser foot (200) is the pressure of the presser foot (200) at the lowest position. The sensor detects the lowest position height of the presser foot (200) and the pressure of the presser foot (200) at the lowest position. 3) The controller (400) calculates the actual distance between the presser foot (200) and the needle plate (300) and the actual pressure difference of the presser foot (200). The actual distance between the presser foot (200) and the needle plate (300) is the difference between the height of the presser foot (200) at its highest position and the height of the presser foot (200) at its lowest position. The actual pressure difference of the presser foot (200) is the difference between the pressure of the presser foot (200) at its highest position and the pressure of the presser foot (200) at its lowest position. 4) When the controller (400) determines that the actual distance between the presser foot (200) and the needle plate (300) conforms to the preset distance between the presser foot (200) and the needle plate (300), and the controller (400) determines that the actual pressure difference of the presser foot (200) conforms to the preset pressure difference of the presser foot (200), then proceed to step 5); when the controller (400) determines that the actual distance between the presser foot (200) and the needle plate (300) does not conform to the preset distance between the presser foot (200) and the needle plate (300), or the controller (400) determines that the actual pressure difference of the presser foot (200) does not conform to the preset pressure difference of the presser foot (200), then proceed to step 6); 5) The controller (400) obtains the operating parameters of the feed motor (510) and the lifting tooth motor (110) according to the actual distance between the presser foot (200) and the needle plate (300) and the actual pressure difference of the presser foot (200). The controller (400) drives the feed motor (510) to rotate according to the obtained operating parameters of the feed motor (510). The controller (400) drives the lifting tooth motor (110) to rotate according to the obtained operating parameters of the lifting tooth motor (110). The sewing machine starts to feed. 6) The controller (400) transmits a warning message to the display device (700), and the display device (700) displays the warning message as: there is a mismatch between the feed dog (140) and the needle plate (300).

2. The method for switching fabric feeding motion according to claim 1, characterized in that: The presser foot motor (810) drives the presser foot (200) through the presser foot transmission component (820). The presser foot transmission component (820) includes a transmission rod component (821) and a presser rod (822) connected in sequence. The transmission input part of the transmission rod component (821) is connected to the output end of the presser foot motor (810), and the transmission output part of the transmission rod component (821) is connected to the upper end of the presser rod (822). The lower end of the presser rod (822) is connected to the presser foot (200). The upper end of the presser rod (822) is sleeved on a fixed guide rod (830). The upper end of the guide rod (830) is sleeved with a fixing sleeve (840). The fixing sleeve (840) and the presser rod (822) are connected by a pressure adjusting spring (850). The pressure adjusting spring (850) is sleeved on the guide rod (830).

3. The method for switching fabric feeding motion according to claim 1, characterized in that: The sensor that detects the lowest and highest position height of the presser foot (200) is a position sensor (910).

4. The method for switching fabric feeding motion according to claim 1, characterized in that: The sensors that detect the pressure of the presser foot (200) at the lowest position and the pressure of the presser foot (200) at the highest position are gravity sensors (920).

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