Tension control device and control method

Abstract

The invention discloses a tension control device and method, and belongs to the technical field of sewing equipment control. The technical problem that when an existing tensioning belt is sewn together with cloth, stable and moderate tension cannot be kept is solved. The tension control device comprises a belt feeding mechanism, a tension control mechanism and a control mechanism, wherein the belt feeding mechanism is used for adjusting the deformation of a tensioning belt to output different tensions; the tension measuring mechanism is used for detecting the actual tension value of the tension when the tensioning belt is sewed; the control unit is used for receiving the actual tension value conveyed by the tension measuring mechanism and comparing and analyzing the actual tension value and a preset tension value to control the belt conveying mechanism to work so as to adjust the tensioning belt to output constant tension. The tension control device has the advantages that stable and moderate tension of the tensioning belt can be kept during sewing, so that the uniformity of the sewing effect of each piece of clothes is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing equipment control, and particularly to a tension control device and a control method. Background Art

[0002] At present, when a sewing equipment sews a tension belt (made of an elastic band or other elastic materials), in order to achieve a good sewing effect, it is necessary to keep the tension belt moving together with the fabric to be sewn, or to keep the tension belt uniformly at a fixed tension value. The tension needs to be moderate. Too tight or too loose will cause problems. If the tension belt is overstretched during sewing, its elasticity may be damaged, resulting in insufficient elasticity in, for example, cuffs after sewing and unable to meet the expected elastic requirements; if the tension of the tension belt is too loose, it may cause, for example, cuffs to easily slip off during wearing, affecting the wearing experience.

[0003] In order to enable the tension belt to reach a moderate tension during the sewing process with the fabric, currently, a damping is applied to the tension belt to keep it at a moderate tension, and then the sewing effect is controlled according to the sewing speed.

[0004] However, in the process of implementing the technical solution of the present invention in the embodiments of the present application, the inventors of the present application found that the above technology has at least the following technical problems: Since the damping has poor stability of the tension generated on the tension belt, it is difficult to ensure the consistency of the sewing effect of each piece of clothing. Summary of the Invention

[0005] The present application provides a tension control device and a control method, which solve the technical problem that the tension belt cannot maintain a stable and moderate tension when sewing with the fabric in the prior art, and achieve the technical effect of being able to maintain a stable and moderate tension of the tension belt during sewing, thereby ensuring the consistency of the sewing effect of each piece of clothing.

[0006] The present application provides a tension control device, which is characterized by including:

[0007] A belt feeding mechanism for adjusting the deformation size of the tension belt to output different tensions;

[0008] A tension measuring mechanism for detecting the actual tension value of the tension belt during sewing;

[0009] A control unit for receiving the actual tension value conveyed by the above tension measuring mechanism, comparing and analyzing the size of the actual tension value and the preset set tension value, and controlling the above belt feeding mechanism to work so as to adjust the tension belt to output a constant tension.

[0010] In the above-mentioned tension control device, it is characterized in that the tape feeding mechanism includes a driving motor, a driving roller and a driven roller. The driving roller is installed on the output shaft of the driving motor. One end of the tension belt is clamped between the driving roller and the driven roller. The driven roller is installed on the sewing equipment and together with the driving roller controls the deformation size of the tension belt through friction so that the other end of the tension belt outputs different tensions. The driving motor is electrically connected to the above control unit.

[0011] In the above-mentioned tension control device, it is characterized in that the tension measuring mechanism includes a first roller and a weighing sensor. The weighing sensor is installed on the first roller and is installed on the sewing equipment together with the first roller through a bracket. The other end of the above tension belt passes around the first roller and is sewn to the fabric.

[0012] In the above-mentioned tension control device, it is characterized in that it further includes a second roller installed on the sewing equipment. The other end of the above tension belt passes around the first roller and the second roller in sequence and is sewn to the fabric. The above driving roller, driven roller and second roller are located on the same side of the first roller.

[0013] In the above-mentioned tension control device, it is characterized in that the weighing sensor is replaced by an S-type force sensor.

[0014] In the above-mentioned tension control device, it is characterized in that it further includes a human-machine interaction module for presetting a set tension value and displaying the actual tension value. The human-machine interaction module is a liquid crystal display.

[0015] In the above-mentioned tension control device, it is characterized in that the tension belt is an elastic band or made of other elastic materials; the driving motor is a stepping closed-loop motor, a DC motor or a servo motor.

[0016] A tension control method is characterized by including the following steps:

[0017] S1. When the detected actual tension value is greater than the set tension value, control the tape feeding mechanism to adjust the tension belt to reduce deformation to lower the tension value of the tension belt until the set tension value.

[0018] S2. When the detected actual tension value is less than the set tension value, control the tape feeding mechanism to adjust the tension belt to increase deformation to raise the tension value of the tension belt until the set tension value.

[0019] S3. Keep the actual tension value constant at the set tension value until the sewing is completed.

[0020] In the above-mentioned tension control method, it is characterized in that the specific content of step S1 is:

[0021] When the detected actual tension value is greater than the set tension value, the control unit controls the drive motor in the tape feeding mechanism to rotate in the wire feeding direction. The rotational speed of the drive motor gradually decreases from fast and gradually approaches 0. When the rotational speed of the drive motor is 0, the tension belt is conveyed with the tension magnitude of the set tension value.

[0022] The wire feeding direction is the direction in which the tension belt goes to the sewing needle for sewing.

[0023] In the above-mentioned tension control method, it is characterized in that the specific step S2 is as follows:

[0024] When the detected actual tension value is less than the set tension value, the control unit controls the drive motor in the tape feeding mechanism to rotate in the wire winding direction. The rotational speed of the drive motor gradually decreases from fast and gradually approaches 0. When the rotational speed of the drive motor is 0, the tension belt is conveyed with the tension magnitude of the set tension value;

[0025] The wire winding direction is the opposite direction of the wire feeding direction.

[0026] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0027] 1. Since the technical means of comparing and analyzing the actual tension value with the preset set tension value by the control unit to control the operation of the tape feeding mechanism so as to adjust the tension belt to output a stable tension is adopted, therefore, the technical problem that the tension belt cannot maintain a stable and appropriate tension when sewing together with the fabric in the prior art is effectively solved. Furthermore, the technical effect of being able to maintain a stable and appropriate tension of the tension belt during sewing so as to ensure the consistency of the sewing effect of each piece of clothing is achieved.

[0028] 2. The tension measuring device can accurately measure the tension value received by the tension belt, avoiding the method of estimating the tension value by experience and trying the feel for sewing through multiple experiments.

[0029] 3. The overall structure design is simple and the cost is low, making the system have better cost performance. Description of the Drawings

[0030] Figure 1 is the structural schematic diagram of this tension control device.

[0031] Figure 2 is the structural schematic diagram of this tension control device.

[0032] Figure 3 is another structural schematic diagram of this tension control device.

[0033] Figure 4 is the flow chart of this tension control method.

[0034] In the figure, 1 is the drive motor; 2 is the driving roller; 3 is the driven roller; 4 is the first roller; 5 is the weighing sensor; 6 is the second roller; 7 is the bracket; 8 is the control unit; 9 is the liquid crystal display; 10 is the elastic band. Detailed implementation mode

[0035] By providing a tension control device and a control method in the embodiments of the present application, the technical problem that the tension of the tension belt cannot be maintained at a stable and moderate level when sewing with the fabric in the prior art is solved, and a stable and moderate tension of the tension belt can be maintained during sewing, thereby ensuring the consistency of the sewing effect of each piece of clothing.

[0036] The technical solution in the embodiments of the present application to solve the above tension stability problem is generally as follows:

[0037] The actual tension value of the tension of the tension belt during sewing is detected in real time through the tension measuring mechanism; then the control unit controls the operation of the belt feeding mechanism according to the actual tension value received from the tension measuring mechanism, and compares and analyzes the size of the actual tension value and the preset set tension value to adjust the output of a stable tension of the tension belt. Dynamically adjust the output of a stable and moderate tension of the tension belt to better match the sewing of the fabric, and ensure the consistency of the sewing effect of each piece of clothing.

[0038] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0039] Embodiment 1

[0040] As Figure 1 shown, this embodiment provides a tension control device, including:

[0041] A belt feeding mechanism for adjusting the deformation size of the tension belt to output different tensions;

[0042] As Figure 2 and 3 shown, the belt feeding mechanism includes a drive motor 1, a driving roller 2 and a driven roller 3. The driving roller 2 is installed on the output shaft of the drive motor. One end of the tension belt is clamped between the driving roller 2 and the driven roller 3. The driven roller 3 is installed on the sewing equipment and controls the deformation size of the tension belt together with the driving roller 2 through friction to make the other end of the tension belt output different tensions. The drive motor 1 is electrically connected to the control unit 8;

[0043] A tension measuring mechanism for detecting the actual tension value of the tension of the tension belt during sewing;

[0044] The tension measuring mechanism includes a first roller 4 and a weighing sensor 5. The tension control device further includes a second roller 6. The second roller 6 is installed on the sewing equipment. The weighing sensor 5 is installed on the first roller 4 and is installed on the sewing equipment together with the first roller 4 through a bracket 7. The other end of the tension belt passes around the first roller 4 and the second roller 6 and is sewn to the fabric. The driving roller 2, the driven roller 3 and the second roller 6 are located on the same side of the first roller 4;

[0045] A control unit 8, which is used to receive the actual tension value transmitted by the tension measuring mechanism, and compare and analyze the size of the actual tension value and the preset set tension value to control the operation of the tape feeding mechanism so as to adjust the tension belt to output a stable tension;

[0046] A human-machine interaction module, which is used to preset the set tension value and display the actual tension value. The human-machine interaction module in this embodiment is a liquid crystal display 9.

[0047] The tension belt in this embodiment is an elastic band 10, and of course it can also be made of other elastic materials.

[0048] The elastic band 10 is clamped between the driving roller 2 and the driven roller 3. The driving motor 1 works to drive the driving roller 2 to rotate. The driving roller 2 drives the driven roller 3 to rotate, and the frictional force between the two drives the elastic band 10 to move for feeding. When the elastic band 10 feeds at a moderate and stable tension state, the rotation speed of the driving motor 1 tends to 0. During operation, one end of the elastic band 10 is clamped between the driving roller 2 and the driven roller 3, and the other end passes through the first roller 4 and the second roller 6 in sequence and enters the working fabric, and is sewn to the fabric under the drive of the sewing machine needle.

[0049] Before work, the staff first sets the set tension value through the liquid crystal display 9. The set tension value is stored in the control unit 8, and the set tension value can be modified through the liquid crystal display 9 according to actual needs. During operation, the weighing sensor 5 in the tension measuring mechanism detects and collects the actual tension value of the elastic band 10 in real time, and compares and analyzes the actual tension value with the preset set tension value. When the detected actual tension value is greater than the set tension value, the control unit 8 controls the driving motor 1 in the tape feeding mechanism to rotate in the wire feeding direction, and the rotation speed of the driving motor 1 gradually decreases from fast and gradually tends to 0. When the rotation speed of the driving motor is 0, the tension belt is transmitted at the tension value of the set tension value; when the detected actual tension value is less than the set tension value, the control unit 8 controls the driving motor 1 in the tape feeding mechanism to rotate in the wire collecting direction, and the rotation speed of the driving motor 1 gradually decreases from fast and gradually tends to 0. When the rotation speed of the driving motor is 0, the tension belt is transmitted at the tension value of the set tension value; the wire feeding direction is the direction where the tension belt goes to the sewing of the sewing machine needle, and the wire collecting direction is the opposite direction of the wire feeding direction. The weighing sensor 5 detects and collects the actual tension value of the elastic band 10 in real time specifically as: For example Figure 2As shown in the figure, the first roller 4 generates an upward pulling force under the pulling force of the tension of the elastic band 10. At this time, the generated pulling force is twice the actual tension value of the elastic band 10. The load cell 5 measures this pulling force, and the measured pulling force value divided by 2 can obtain the actual tension value of the elastic band 10, and then feedback it to the control unit 8; when the first roller 4 is subjected to an upward pulling force, the load cell 5 will deform and generate weighing data, thereby detecting the pulling force value and obtaining the actual tension value of the elastic band 10. The control unit 8 obtains the feedback value of the actual tension value from the load cell 5 in the form of AD acquisition, and then completes the driving work of the driving motor 1 in combination with the driving circuit of the driving motor 1. The control unit 8 calculates the difference between the actually measured tension value and the set tension value in real time according to the calculation period, and according to the PID closed-loop control calculation method, continuously adjusts the output. The specific output performance is to adjust the rotation speed of the driving motor 1. The driving motor 1 drives the active roller 2 to rotate, and the driven roller 3 rotates with the active roller 2 by friction. The elastic band 10 moves forward or backward through the friction of the two rollers, and its deformation changes, resulting in a change in tension, which is fed back to the input end, and the entire system forms a closed loop. The feedback of the entire control device undergoes hardware filtering and digital filtering design, which makes the entire system more robust and the control more stable while ensuring the real-time and accuracy of the signal, as Figure 1 shown. The change in the rotation speed of the driving motor 1 is reflected in the change in the deformation of the elastic band 10, and the change in deformation finally turns into a change in tension.

[0050] The load cell 5 in this embodiment can also be replaced with an S-type force sensor; the driving motor 1 is a stepping closed-loop motor, a DC motor or a servo motor.

[0051] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0052] 1. Since the technical means of using the control unit to compare and analyze the actual tension value with the preset set tension value to control the operation of the tape feeding mechanism and thus adjust the tension of the tension belt to output a stable tension is adopted, the technical problem that the tension belt in the prior art cannot maintain a stable and moderate tension when sewing with the fabric is effectively solved. Furthermore, the technical effect of being able to maintain a stable and moderate tension of the tension belt during sewing to ensure the consistency of the sewing effect of each piece of clothing is achieved.

[0053] 2. The tension measuring device can accurately measure the tension value of the tension belt, avoiding the method of estimating the tension value by experience and trying the feel through multiple experiments for sewing.

[0054] 3. The overall structure design is simple and the cost is low, making the system have a better cost performance.

[0055] Embodiment 2

[0056] In this embodiment, compared with the first embodiment, the second roller 6 is not included, and the other end of the tension belt is directly sewn to the fabric after passing around the first roller 4.

[0057] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0058] The structure is more simplified and the cost is reduced.

[0059] Embodiment Three

[0060] As Figure 4 shown, a tension control method includes the following steps:

[0061] S1. When the detected actual tension value is greater than the set tension value, control the belt feeding mechanism to adjust the deformation of the tension belt to decrease, so as to reduce the tension value of the tension belt until the set tension value;

[0062] When the detected actual tension value is greater than the set tension value, the control unit controls the drive motor in the belt feeding mechanism to rotate in the wire feeding direction. The rotation speed of the drive motor gradually decreases from fast and gradually approaches 0. When the rotation speed of the drive motor is 0, the tension belt is transmitted with the tension value of the set tension value; the wire feeding direction is the direction where the tension belt goes to the sewing needle.

[0063] S2. When the detected actual tension value is less than the set tension value, control the belt feeding mechanism to adjust the deformation of the tension belt to increase, so as to increase the tension value of the tension belt until the set tension value;

[0064] When the detected actual tension value is less than the set tension value, the control unit controls the drive motor in the belt feeding mechanism to rotate in the wire collecting direction. The rotation speed of the drive motor gradually decreases from fast and gradually approaches 0. When the rotation speed of the drive motor is 0, the tension belt is transmitted with the tension value of the set tension value; the wire collecting direction is the opposite direction of the wire feeding direction.

[0065] S3. Keep the actual tension value stable at the set tension value until the sewing is completed.

[0066] This embodiment is described with the tension belt being an elastic band.

[0067] The specific working principle is as follows:

[0068] When the detected actual tension value is greater than the set tension value, it indicates that the elastic band is deformed too much at this time, and the upward pulling force acting on the first roller is too large. At this time, control the driving motor to rotate in the wire feeding direction. The elastic band moves forward faster through the friction force of the driving roller and the driven roller, the deformation of the elastic band becomes smaller, the tension generated by the elastic band decreases, the upward pulling force acting on the first roller decreases, the deformation of the weighing sensor 5 becomes smaller, and the feedback actual tension value decreases; at the beginning stage of control, since the difference between the actual tension value and the set tension value is the largest, in order to improve the adjustment efficiency, the driving motor rotates at the fastest speed at this time, and the tension adjustment speed is fast. When the tension difference gradually becomes smaller, the rotation speed also gradually decreases until the feedback actual tension value gradually decreases until it is the same as the set tension value. At this time, the rotation speed of the driving motor gradually decreases from fast and gradually approaches 0. When the rotation speed of the driving motor is 0, the tension belt is conveyed with the tension value of the set tension value. When the detected actual tension value is less than the set tension value, it indicates that the elastic band is deformed too little at this time, and the upward pulling force acting on the first roller is too small. At this time, control the driving motor to rotate in the wire collecting direction. The elastic band contracts backward faster through the friction force of the driving roller and the driven roller, the deformation of the elastic band becomes larger, the tension generated by the elastic band becomes larger, the upward pulling force acting on the first roller becomes larger, the deformation of the weighing sensor 5 becomes larger, and the feedback actual tension value becomes larger; at the beginning stage of control, since the difference between the actual tension value and the set tension value is the largest, in order to improve the adjustment efficiency, the driving motor rotates at the fastest speed at this time, and the tension adjustment speed is fast. When the tension difference gradually becomes smaller, the rotation speed also gradually decreases until the feedback actual tension value gradually becomes larger until it is the same as the set tension value. At this time, the rotation speed of the driving motor gradually decreases from fast and gradually approaches 0. When the rotation speed of the driving motor is 0, the tension belt is conveyed with the tension value of the set tension value.

[0069] The technical solutions in the embodiments of the present application described above have at least the following technical effects or advantages:

[0070] By using the technical means that the control unit compares and analyzes the size of the actual tension value and the preset set tension value to control the operation of the belt feeding mechanism so as to adjust the tension belt to output a stable tension, therefore, it effectively solves the technical problem that the tension belt cannot maintain a stable and appropriate tension when sewing with the fabric in the prior art, and further realizes the technical effect of being able to maintain a stable and appropriate tension of the tension belt during sewing to ensure the consistency of the sewing effect of each piece of clothing.

[0071] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0072] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations therein.

Claims

1. A tension control device, characterized in that: include: A belt feeding mechanism, wherein the belt feeding mechanism is used to adjust the deformation of the tensioning belt to output different tensions; The tension measuring mechanism is used to detect the actual tension value of the tension belt when sewing; The control unit (8) is used to receive the actual tension value transmitted by the tension measuring mechanism, and compare and analyze the actual tension value with the preset tension value to control the operation of the belt feeding mechanism, thereby adjusting the tension belt to output a constant tension.

2. A tension control device according to claim 1, characterized in that: The belt feeding mechanism comprises a driving motor (1), a driving roller (2) and a driven roller (3); the driving roller (2) is mounted on the output shaft of the driving motor (1); one end of the tension belt is clamped between the driving roller (2) and the driven roller (3); the driven roller (3) is mounted on the sewing device and together with the driving roller (2), controls the deformation of the tension belt through friction so that the other end of the tension belt outputs different tensions; the driving motor (1) is electrically connected to the above-mentioned control unit (8).

3. A tension control device as claimed in claim 2, characterized in that: The tension measuring mechanism comprises a first roller (4) and a weighing sensor (5). The weighing sensor (5) is mounted on the first roller (4) and is mounted on the sewing device together with the first roller (4) through a bracket (7). The other end of the tensioning belt passes through the first roller (4) and is sewn together with the cloth.

4. A tension control device as claimed in claim 3, characterized in that: It also includes a second roller (6) installed on the sewing device, the other end of the tension belt is passed through the first roller (4) and the second roller (6) in sequence to be sewn together with the cloth, and the active roller (2), the driven roller (3) and the second roller (6) are located on the same side of the first roller (4).

5. A tension control device according to claim 3 or 4, characterized in that: The weighing sensor (5) is replaced by an S-type force sensor.

6. A tension control device as claimed in claim 5, characterized in that: It also includes a human-computer interaction module, which is used to preset a set tension value and display an actual tension value, and the human-computer interaction module is a liquid crystal display (9).

7. A tension control device as claimed in claim 2, characterized in that: The tensioning belt is an elastic belt (10) or is made of other elastic materials; the driving motor (1) is a stepping closed-loop motor or a DC motor or a servo motor.

8. A tension control method, characterized in that: The steps include: S1. When the actual tension value detected is greater than the set tension value, the belt feeding mechanism is controlled to adjust the deformation of the tension belt to reduce the tension value of the tension belt until the set tension value is reached; S2. When the detected actual tension value is less than the set tension value, the belt feeding mechanism is controlled to adjust the deformation of the tension belt to increase the tension value of the tension belt until the set tension value is reached; S3. Keep the actual tension value constant at the set tension value until the sewing is completed.

9. A tension control method according to claim 8, characterized in that: The step S1 is specifically as follows: When the detected actual tension value is greater than the set tension value, the control unit (8) controls the drive motor (1) in the belt feeding mechanism to rotate in the wire feeding direction, and the speed of the drive motor (1) gradually decreases from fast to 0. When the speed of the drive motor (1) is 0, the tension belt is transmitted at the tension value of the set tension value; The wire feeding direction is the direction from the tensioning belt to the sewing needle.

10. A tension control method according to claim 9, characterized in that: The step S2 is specifically as follows: When the detected actual tension value is less than the set tension value, the control unit (8) controls the drive motor (1) in the belt feeding mechanism to rotate in the wire-reeling direction, and the speed of the drive motor (1) gradually decreases from fast to 0. When the speed of the drive motor (1) is 0, the tension belt is transmitted at the tension value of the set tension value. The wire taking-up direction is the opposite direction of the wire feeding direction.

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