TWI709676B - Sewing machine having automatically controlling process, and method for controlling the same - Google Patents

Abstract

A sewing machine used for sewing cloths having a control unit, an operation interface, a cloth sensing unit, a motor driver, and a motor is disclosed. The cloth sensing unit senses current thickness of the cloth upon the sewing machine. When the current thickness is sensed within a threshold, the control unit directly accepts an instruction from the operation interface and sends a corresponding operation signal to the motor driver, and the motor driver then controls the speed of the motor correspondingly according to the operation signal. When the current thickness changes, the control unit automatically generates and transmits a slow-down signal to the motor driver, and the motor driver replaces the operation signal with the slow-down signal for changing the speed of the motor according to the slow-down signal, therefore, the sewing machine is effectively and automatically prevented from being damaged due to thick cloth and speeded motor.

Description

Sewing machine with automatic control mechanism and automatic control method thereof

The invention relates to a sewing machine, in particular to a sewing machine with an automatic control mechanism, and an automatic control method of the sewing machine.

Under normal conditions without special requirements, the sewing machine operator will usually operate the sewing machine at the highest operating speed in order to run the sewing machine at full speed and obtain the highest work efficiency. Under certain circumstances, the operating technicians should appropriately reduce the operating speed of the sewing machine, so that the sewing machine will not be damaged and the production schedule will stop.

Specifically, when the sewing machine is in operation, the reaction force experienced by the needle when it pierces the cloth will increase as the operating speed of the motor increases, and the greater the thickness of the cloth, the greater the reaction force of the key needle. If the sewing machine controls the sewing needle to pierce the cloth with a certain thickness under the high-speed motor operation, the reaction force generated by the sewing machine may be greater than the force that the sewing needle itself can bear, causing the key needle to break.

In order to prevent the key needle from breaking during the operation of the sewing machine, the operator must observe the current thickness change of the fabric with his own vision and/or touch when the sewing machine is operating, and quickly reduce the operating speed of the sewing machine when the fabric thickens to avoid stitches Break, and restore the operating speed of the sewing machine when the cloth becomes thinner to ensure and maintain production efficiency.

It can be seen from the above description that the current sewing machine needs to rely heavily on the operator's own high concentration and reaction ability to operate, so as to avoid the occurrence of the above problems. However, a high degree of concentration and responsiveness will accelerate the fatigue of the operator. Therefore, how to reduce the fatigue of the operator while maintaining the production efficiency and quality is a topic that the technicians in this field have concentrated on. .

The main purpose of the present invention is to provide a sewing machine with an automatic control mechanism and an automatic control method thereof, which can automatically control and change the operating speed of the motor according to the thickness of the currently sewn cloth.

In order to achieve the above objective, the sewing machine of the present invention mainly has a control unit, an operating interface, a cloth sensing unit, a motor driving unit and a motor. The cloth sensing unit is used for sensing the thickness of a cloth currently being sewn. When the thickness of the cloth falls within a threshold, the control unit receives an instruction from the operation interface and sends a corresponding operation signal to the motor driver, and the motor driver correspondingly controls the motor according to the operation signal of the control unit One running speed. When the cloth sensing unit senses that the thickness of the cloth changes, the control unit automatically generates a deceleration signal and sends it to the motor driver. The motor driver replaces the original operation signal with the deceleration signal to change the motor's Operating speed.

Compared with the related technology, the technical effect of the present invention is that it can automatically control and limit the running speed of the motor according to the thickness of the cloth, which can avoid the problem of the sewing machine being damaged by the operator's careless operation. In this way, the present invention can effectively assist manual operation and greatly reduce the operation The skill of the craftsman, concentration and reaction ability are required to avoid the above-mentioned problems while maintaining production efficiency.

1: Sewing machine

10: Control unit

101: Algorithm

11: Operation interface

12: Motor drive unit

13: Motor

14: Sewing machine spindle

15: Cloth sensing unit

16: Setting interface

17: display interface

18: platform

19: Feeding teeth

21: Needle bar

22: Stitch

3: Presser foot mechanism

31: drive shaft

32: pivot

33: Pressing element

4: cloth

5: Cloth sensing unit

H1: first height

H2: second height

S10~S30: Control steps

Fig. 1 is a first embodiment of a block diagram of a sewing machine of the present invention.

Fig. 2 is a first embodiment of the operation schematic diagram of the sewing machine of the present invention.

FIG. 3 is a first specific embodiment of the schematic diagram of the displacement signal of the present invention.

Fig. 4 is a first specific embodiment of the control flowchart of the present invention.

Fig. 5 is a second embodiment of the operation schematic diagram of the sewing machine of the present invention.

For a preferred embodiment of the present invention, with the drawings, the detailed description is as follows.

Refer to Fig. 1, which is a first embodiment of the block diagram of the sewing machine of the present invention. The present invention discloses a sewing machine with an automatic control mechanism (hereinafter referred to as sewing machine 1 in the specification). As shown in FIG. 1, the sewing machine 1 at least includes a control unit 10 and an operating interface electrically connected to the control unit 10. 11. Motor drive unit 12 and cloth sensing unit 15.

The control unit 10 is mainly used to integrate electronic components inside the sewing machine 1 and transmit corresponding electronic signals. In one embodiment, the control unit 10 may be, for example, a micro control unit (MCU), a processor ( Processor) or System On a Chip (System On a Chip), etc., are not limited.

The operating interface 11 can be a physical interface (for example, an interface composed of physical buttons, switches, switches, joysticks, etc.) or a virtual interface (for example, a human-machine interface displayed on a screen), and the user can The sewing machine 1 is controlled through the operation interface 11. In one embodiment, the sewing machine 1 can be manipulated by a user (for example, an operator) through the operating interface 11 to adjust the operating mode, operating speed and other parameters of the sewing machine 1.

As shown in FIG. 1, the motor driving unit 12 is electrically connected to the motor 13 of the sewing machine 1, and the operating speed of the motor 13 is adjusted according to the control of the control unit 10.

Specifically, after the user performs an operation on the operating interface 11, the operating interface 11 generates corresponding control instructions according to the user's operating behavior, and transmits the control instructions to the control unit 10 (for example, sending electronic signals by wire control) To the control unit 10). In the case of normal operation, the control right of the sewing machine 1 belongs to the operation interface 11 by default, that is, the user can fully control the operation of the sewing machine 1 through the operation interface 11. In this case, the control unit 10 will generate a corresponding operation signal according to the received control command, and transmit the operation signal to the motor driving unit 12.

In this embodiment, the operation signal generated by the control unit 10 is also an electronic signal. After the motor drive unit 12 receives the operation signal sent by the control unit 10, it can output corresponding power to the motor 13 according to the operation signal, thereby driving the motor 13 to operate. Wherein, the amount of power output by the motor drive unit 12 corresponds to the content of the operation signal, whereby the motor drive unit 12 can ensure that the motor 13 runs at a specific operating speed (that is, the operating speed of the motor 13 corresponds to the operating speed Operator’s behavior).

As shown in FIG. 1, the motor 13 is mainly installed on the main shaft 14 of the sewing machine. Through the operation of the motor 13, the main shaft 14 of the sewing machine can be driven to control the sewing components (detailed later) on the sewing machine 1 to realize the sewing action. In the present invention, the operating speed of the motor 13 corresponds to the operating efficiency of the sewing component (within a certain range, the faster the operating speed of the motor 13 is, the higher the operating efficiency that the sewing component can achieve).

One of the technical features of the present invention is that when the sewing machine 1 performs a sewing action on the cloth (the cloth 4 shown in FIG. 2), the control unit 10 can actively or passively control the cloth sensing unit 15 to continuously sense the cloth 4 The current thickness, and the control right of the sewing machine 1 is switched when the thickness of the cloth 4 is sensed to change.

Specifically, the sewing machine 1 of the present invention can divide the operation mode into at least a normal operation mode and a restricted operation mode. In the normal operation mode, the control unit 10 transfers the control right of the sewing machine 1 to the operation interface 11 (that is, the user has full control of the sewing machine 1), in other words, the user can directly control the motor 13 through the operation interface 11 To control the overall operating efficiency of the sewing machine 1.

As mentioned above, if the thickness of the cloth 4 is too thick, when the sewing machine 1 operates at a higher operating speed, the stitches (the stitches 22 shown in FIG. 2) may break. In the present invention, the control unit 10 controls the cloth sensing unit 15 to continuously sense the thickness of the cloth 4, when the thickness of the cloth 4 does not change (that is, the same as the initial thickness) or does not exceed a preset threshold value, Make the sewing machine 1 operate in the above-mentioned normal operation mode (that is, transfer the control right to the operation interface 11). Moreover, the control unit 10 causes the sewing machine 1 to operate in the restricted operation mode when the cloth sensing unit 15 senses that the thickness of the cloth 4 changes (ie, is different from the initial thickness) or exceeds the threshold value.

In the restricted operation mode, the control unit 10 mainly transfers the control right of the sewing machine 1 from the operation interface 11 to the control unit 10, so that the control unit 10 itself controls the operating speed of the motor 13 according to a preset script, thereby Limit the sewing machine 1 to a specific operating efficiency. In other words, when the sewing machine 1 is in the restricted operation mode, no matter what kind of operation the user performs on the operation interface 11, the motor drive unit 12 will only follow the commands of the control unit 10 to make the motor 13 operate at A specific operating speed.

In one embodiment, the specific operating speed refers to the fastest operating speed that does not cause the needle 22 to break under the current thickness of the cloth 4. The above-mentioned specific operating speed can be obtained by the manufacturer of the sewing machine 1 after a large number of experimental tests, and is directly recorded in the firmware of the control unit 10, but is not limited to this.

Specifically, when the control unit 10 obtains the relevant information of the cloth 4 from the cloth sensing unit 15, and determines that the current thickness of the cloth 4 has changed, or the current thickness exceeds the preset threshold value, it will automatically retrieve it from the operating interface 11. The sewing machine 1 has the control right, and automatically generates a set of deceleration signals, and at the same time transmits the generated deceleration signals to the motor drive unit 12. In this embodiment, the threshold value corresponds to a specific thickness of the cloth 4, and when the motor 13 of the sewing machine 1 runs at the highest operating speed and the cloth 4 exceeds the specific thickness, the needle 22 will break.

In the restricted operation mode, since the control right belongs to the control unit 10, the motor drive unit 12 receives the deceleration signal sent by the control unit 10 with the control right, and replaces the previously obtained operation signal (or The operation signal is directly discarded), and the operating speed of the motor 13 is modified according to the content of the deceleration signal (that is, the output power is modified), so that the operating speed of the motor 13 meets the requirements of the restricted operation mode.

In one embodiment, the deceleration signal generated by the control unit 10 is the same every time it enters the restricted operation mode, so that the motor drive unit 12 will drive the motor 13 to run in the same operation every time the motor drive unit 12 receives the deceleration signal. speed. In another embodiment, after the control unit 10 enters the restricted operation mode, it can generate a deceleration signal corresponding to the content according to the current thickness of the cloth 4, so that the motor drive unit 12 can drive the motor 13 to run without causing the stitch 22 The fastest running speed of the fracture.

Specifically, the control unit 10 may contain an algorithm 101, and the algorithm 101 may obtain the sensing signal of the cloth sensing unit 15 and perform operations on the sensing signal to determine the cloth 4 The current thickness. Further, the algorithm 101 can also perform a lookup table based on the current thickness, thereby generating the deceleration signal with content corresponding to the current thickness. In this way, the control unit 10 can generate and send the deceleration signal to make the motor 13 run at the most appropriate operating speed. However, the above are only specific implementation examples of the present invention, but should not be limited to the above.

In the present invention, regardless of the normal operation mode or the restricted operation mode, the control unit 10 will continuously obtain the sensing signal of the cloth sensing unit 15. When the sewing machine 1 is operating in the restricted operation mode, and the control unit 10 uses the sensing signal to determine that the current thickness of the fabric 4 has returned to the threshold value, the control right of the sewing machine 1 can be returned to the operating interface 11 ( That is, the user can regain control of the sewing machine 1 through the operation interface 11), so that the sewing machine 1 can be restored to the normal operation mode.

Specifically, when the current thickness of the cloth 4 returns to within the threshold value, it means that the thickness of the cloth 4 becomes thinner, and the sewing machine 1 no longer has the risk of breaking the needle 22. Therefore, the control unit 10 allows the user to control the motor 13 by himself The operating speed, that is, allows the user to adjust the operating efficiency of the sewing machine 1 by himself. When the control right is returned to the operation interface 11, the control unit 10 stops generating and sending the deceleration signal. In addition, the control unit 10 continuously receives the control instruction generated by the user's operation behavior from the operation interface 11, and regenerates the operation signal according to the content of the control instruction. The motor drive unit 12 can discard the aforementioned deceleration signal after the sewing machine 1 returns to the normal operation mode, and adjust the output power according to the operation signal issued by the control unit 10 again, thereby restoring the operating speed of the motor 13.

As shown in FIG. 1, the sewing machine 1 of the present invention also has a setting interface 16 and a display interface 17 electrically connected to the control unit 10. The setting interface 16 can be manipulated by the user to set the system control parameters related to the sewing machine 1, so that the sewing machine 1 can be applied to automatic system control in various states. demand. The display interface 17 can be used to display various settings made by the user through the setting interface 16, so that the user can clearly understand the current system control parameters. The above-mentioned setting interface 16 and display interface 17 can be a physical interface or a virtual interface, respectively, and are not limited.

Please continue to refer to FIG. 2, which is a first embodiment of the operation schematic diagram of the sewing machine of the present invention.

As shown in Fig. 2, the sewing machine 1 of the present invention also has a horizontally arranged platform 18 for placing the cloth 4 to be sewn. As mentioned above, the motor 13 of the sewing machine 1 is mainly installed in the main shaft 14 of the sewing machine, and the main shaft 14 of the sewing machine is connected to the needle bar 21 arranged perpendicularly to the platform 18 by a linkage member (not shown in the figure). The needle bar 21 is close to the platform 18. Said needle 22 is provided at one end of the device. When the motor 13 is running, the main shaft 14 of the sewing machine can be driven, and the main shaft 14 of the sewing machine can drive the needle bar 21 and the sewing needle 22 to move up and down, thereby sewing the cloth 4 on the platform 18 through the sewing needle 22.

As shown in FIG. 2, the bottom surface of the platform 18 is provided with feeding teeth 19, and the feeding teeth 19 can penetrate the bottom surface of the platform 18 and contact the cloth 4. When the sewing machine 1 is operating, the feeding dog 19 is controlled to rotate along the first direction (ie, the arrow direction in FIG. 2) to push the cloth 4 on the platform 18 in the first direction. The top surface of the platform 18 is also provided with a presser foot lifting mechanism 3, the presser foot lifting mechanism 3 is controlled to press the cloth 4 on the feed dog 19 with a certain amount of pressure, and the presser foot mechanism 3 will send The pushing of the cloth 4 causes displacement (mainly displacement in the up and down direction).

In one embodiment, the cloth sensing unit 15 of the present invention is set at an appropriate position on the sewing machine 1, and senses the displacement of the presser foot mechanism 3 through mechanical or electronic means (for example, directly with the presser foot mechanism 3). Connection or electrical connection). More specifically, the cloth 4 is sandwiched between the presser foot mechanism 3 and the feed dog 19, so the height between the bottom surface of the presser foot mechanism 3 and the top surface of the cloth feed dog 19 is the current thickness of the cloth 4, which is also The displacement amount of the presser foot mechanism 3 in the Z-axis direction (ie, the vertical direction). That is, when When the current thickness of the cloth 4 becomes thicker, the displacement of the presser foot mechanism 3 will increase, and when the current thickness of the cloth 4 becomes thinner, the displacement of the presser foot mechanism 3 will decrease.

Please also refer to FIG. 3, which is a first specific embodiment of the schematic diagram of the displacement signal of the present invention. FIG. 3 is used to describe the electronic signal generated by the cloth sensing unit 15. In this embodiment, the electronic signal generated by the cloth sensing unit 15 after sensing is a displacement signal used to represent the displacement of the presser foot mechanism 3.

As shown in FIG. 3, when the thickness of the cloth 4 changes (in FIG. 3, the thickness is increased as an example), the displacement signal generated by the cloth sensing unit 15 changes greatly as the displacement of the presser foot lifting mechanism 3 increases. In the present invention, the control unit 10 continuously receives the electronic signal generated by the cloth sensing unit 15 and analyzes and calculates the electronic signal through the algorithm 101, thereby calculating according to the displacement of the presser foot mechanism 3. The current thickness of fabric 4 is displayed. In this way, the control unit 10 can determine whether to maintain the sewing machine 1 in the normal operation mode or switch to the restricted operation mode according to the current thickness of the fabric 4.

In one embodiment, as long as the control unit 10 determines that the thickness of the cloth 4 changes according to the displacement signal, and when the thickness becomes thicker, it controls the sewing machine 1 to enter the restricted operation mode (ie, withdraw the control right of the operation interface 11) ). In addition, when the control unit 10 determines that the thickness of the cloth 4 changes again according to the displacement signal, and the thickness becomes thinner, the control unit 10 controls the sewing machine 1 to resume the normal operation mode (ie, return the control right to the operation interface 11).

In another embodiment, the control unit 10 may preset a threshold value (for example, the displacement threshold value corresponding to the displacement range, or the thickness threshold value corresponding to the thickness range). When the control unit 10 determines that the thickness of the cloth 4 changes according to the displacement signal, and the thickness after the change is greater than the threshold value, the sewing machine 1 is controlled to enter the restricted operation mode. And, when the control unit 10 judges the cloth according to the displacement signal When the thickness of the material 4 changes and the changed thickness returns to the threshold value, the sewing machine 1 is controlled to resume the normal operation mode.

Back to Figure 2. The presser foot lifting mechanism 3 mainly includes a transmission shaft 31 that can move up and down perpendicular to the platform 18, a pivot 32 arranged on the end of the transmission shaft close to the platform 18, and a pivotal connection to the transmission shaft 31 through the pivot. A cloth pressing element 33 that can swing based on a pivot 32. In this embodiment, the presser foot raising mechanism 3 mainly presses the cloth 4 on the cloth feed dog 19 through the cloth pressing element 33. In this embodiment, the distance between the presser foot mechanism 3 and the feeding dog 19 refers to the distance between the bottom surface of the cloth pressing element 33 and the top surface of the feeding dog 19.

In one embodiment, the cloth sensing unit 15 mainly continuously senses the relative height change between the cloth pressing element 33 and the feed dog 19, that is, the electronic signal generated by the cloth sensing unit 15 may also be A change signal representing the change in height. After the control unit 10 receives the electronic signal from the cloth sensing unit 15, it can analyze and calculate the electronic signal (ie, the relative height change) through the algorithm 101 to obtain the current thickness of the cloth 4.

As shown in FIG. 2, since the presser foot mechanism 3 presses the cloth 4 on the feed dog 19 via the cloth presser 33, the distance between the presser 33 and the feed dog 19 (ie, the first height H1) That is the current thickness of the cloth 4. When the cloth 4 becomes thicker, the distance between the cloth pressing element 33 and the feed dog 19 is changed to the second height H2. In this embodiment, the cloth sensing unit 15 senses the change amount of the second height H2 relative to the first height H1, and generates the electronic signal according to the change amount.

In the above embodiment, the control unit 10 can determine that the current thickness of the fabric 4 is within the threshold value when the distance between the cloth pressing element 33 and the feed dog 19 is the first height H1, so that the sewing machine 1 is maintained in the normal operation mode . When the distance between the cloth pressing element 33 and the feeding dog 19 is changed to the second height H2, the control unit 10 can determine that the current thickness of the cloth 4 has changed and exceeds the threshold value, so that the sewing machine 1 Enter restricted operation mode. When the distance between the cloth pressing element 33 and the feeding dog 19 is changed from the second height H2 to the first height H1, the control unit 10 can determine that the current thickness of the cloth 4 has returned to the threshold value, thus returning the sewing machine 1 to normal Mode of operation. It can be seen that through the technical solution of the present invention, the automatic control program of the sewing machine 1 can be used to maintain the operating efficiency of the sewing machine 1 while avoiding the stitches 22 without relying on the user's high concentration and responsiveness. The risk of breakage is actually quite convenient.

Please continue to refer to FIG. 4, which is the first specific embodiment of the control flowchart of the present invention. The present invention further discloses an automatic control method, which is mainly applied to the sewing machine 1 shown in FIGS. 1 and 2. Through the automatic control method of the present invention, the user of the sewing machine 1 can monitor the current thickness of the fabric by itself without paying a high degree of concentration and reaction ability, and automatically limit the operating speed of the motor according to the current thickness, thereby Avoid the problem of needle breakage caused by thick fabric and too fast motor speed.

As shown in Fig. 4, to use the automatic control method of the present invention, the user first needs to start the sewing machine 1 (step S10). After the sewing machine 1 is started, the control unit 10 controls the cloth sensing unit 15 to continuously sense the current thickness of the cloth 4 (step S12). In an embodiment, the cloth sensing unit 15 senses the change in displacement of the presser foot lifting mechanism 3 in step S12, and the control unit 10 calculates the current thickness of the cloth 4 according to the change in displacement. In another embodiment, the cloth sensing unit 15 senses the relative height change between the cloth pressing element 33 and the feed dog 19 in step S12, and the control unit 10 calculates the cloth 4 according to the relative height change. The current thickness.

It is worth mentioning that the control unit 10 can automatically control the fabric sensing unit 15 to start sensing the fabric 4 after the sewing machine 1 is powered on, or after the user triggers the sensing function of the sewing machine 1, according to the use The control of the person is to enable the cloth sensing unit 15 and is not limited.

The control unit 10 continuously receives the electronic signal generated by the cloth sensing unit 15, calculates the current thickness of the cloth 4 according to the content of the electronic signal, and determines whether the current thickness of the cloth 4 exceeds a preset threshold value (step S14). In one embodiment, the threshold value is the thickness of the cloth that may cause the stitch 22 to break under the maximum operating speed of the motor 13. However, the above is only one of the implementation examples of the present invention, and should not be limited thereto.

If the current thickness of the fabric 4 does not exceed the threshold value, in this embodiment, the control unit 10 transfers the control of the sewing machine 1 to the operation interface 11 (step S16), that is, the sewing machine 1 is in the normal operation mode. In the normal operation mode, the user can fully control the sewing machine 1 through the operating interface 11, that is, the user can arbitrarily adjust the operating speed of the motor 13 (ie, the operating efficiency of the sewing machine 1).

In the normal operation mode, the control unit 10 will continue to receive the control commands generated by the user's operation behavior through the operation interface 11 (step S18), and generate corresponding operation signals according to the content of the control commands, and then transfer the generated The operation signal is transmitted to the motor drive unit 12 (step S20). The motor drive unit 12 can receive the operating signal from the control unit 10, and output corresponding power to the motor 13 according to the content of the operating signal to control the operating speed of the motor 13 so that the operating speed of the motor 13 conforms to the user's operating behavior ( Step S22).

If it is determined in step S14 that the current thickness of the fabric 4 exceeds the threshold value, the control unit 10 will retrieve the control right of the sewing machine 1 from the operation interface 11 (S24), so that the sewing machine 1 enters the said from the normal operation mode. Restrict the mode of operation. In the restricted operation mode, the control unit 10 automatically generates a deceleration signal according to a preset script, and transmits the deceleration signal to the motor driving unit 12 (step S26). After the motor drive unit 12 receives the deceleration signal from the control unit 10, it will take the deceleration signal Substituting the previously obtained operating signal and modifying the output power accordingly, thereby modifying the operating speed of the motor 13 so that the operating speed of the motor 13 conforms to the content of the deceleration signal issued by the control unit 10 (step S28).

It is worth mentioning that in the restricted operation mode, the user can still continue to operate the operating interface 11, and the operating interface 11 can continuously generate and issue the control command according to the user's operating behavior. However, because the control of the sewing machine 1 is on the control unit 10 in the restricted operation mode, the control unit 10 ignores the control commands issued by the operation interface 11 (or discards the control commands after receiving them), and decelerates by itself. The signal is used to control the motor drive unit 12.

In the present invention, the content of the deceleration signal mainly corresponds to the maximum operating speed of the motor 13 that does not cause the needle 22 to break under the currently sensed fabric thickness. In other words, as long as the motor drive unit 12 controls the operating speed of the motor 13 according to the content of the deceleration signal, the stitch 22 will not be broken due to the current thickness of the cloth 4 being too thick. However, the above is only one of the implementation examples of the present invention, and should not be limited thereto.

In one embodiment, the control unit 10 may generate a deceleration signal with the same content every time it enters the restricted operation mode, thereby restricting the motor 13 to operate at the same operating speed.

In another embodiment, the control unit 10 may calculate the current thickness of the fabric 4 through the algorithm 101 after entering the restricted operation mode, so as to obtain the maximum operating speed that does not cause the needle 22 to break under the thickness, and according to The maximum operating speed is used to generate the deceleration signal. In this embodiment, although the sewing machine 1 is operating in the restricted operation mode, the motor 13 can still change its operating speed according to the current thickness of the cloth 4, thereby effectively maintaining the operating efficiency of the sewing machine 1.

During the operation of the sewing machine 1, the control unit 10 continues to determine whether the user's operation is over (step S30), and continues to execute the aforementioned steps S12 to S28 before the end of the operation to make The sewing machine 1 dynamically switches between the normal operation mode in which the motor speed is controlled by the user and the limited operation mode in which the motor speed is automatically controlled by the system according to the current thickness of the cloth 4.

It is worth mentioning that if the sewing machine 1 is operating in the restricted operation mode, and the control unit 10 determines in step S14 that the current thickness of the fabric 4 is restored to the threshold value, the control unit 10 will further return the control right to the operating interface 11, and regenerate the operation signal according to the control command issued by the operation interface 11. After the motor drive unit 12 obtains the operating signal from the control unit 10, the operating signal can replace the previously obtained deceleration signal to modify the output power, thereby restoring the operating speed of the motor 13 so that the operating speed of the motor 13 is in line with the use Operator’s behavior.

Through the automatic control method of the present invention, the sewing machine can enable the user to fully control the control of the sewing machine 1 when the thickness of the cloth is thin, so as to obtain the best operating efficiency; and when the cloth becomes thicker, the sewing machine can automatically control and limit the motor The speed of operation, so as to avoid the problem of needle breakage in an automatic control method without excessively relying on the user's concentration and reaction.

Please continue to refer to FIG. 5, which is a second specific embodiment of the operation schematic diagram of the sewing machine of the present invention.

In the foregoing embodiment, the cloth sensing unit 15 mainly senses the displacement (or relative height change) of the presser foot mechanism 3 and generates a corresponding electronic signal, thereby enabling the control unit 10 to calculate the current thickness of the cloth 4 . This embodiment discloses another cloth sensing unit 5. As shown in FIG. 5, the cloth sensing unit 5 may be a camera, and the algorithm 101 of the control unit 10 may be an image recognition algorithm. .

In this embodiment, the cloth sensing unit 5 may be mainly arranged on one side of the platform 18 and perform an image capturing action toward the placement position of the cloth 4. The control unit 10 can control the cloth sensing unit 5 to continuously capture images of the cloth 4 during the operation of the sewing machine 1, and the control unit 10 can pass The image recognition algorithm performs image recognition on the image of the cloth 4, thereby determining the current thickness of the cloth 4 according to the recognition result.

In one embodiment, the control unit 10 can extract an image of the cloth 4 from the image, and perform image recognition on the image of the cloth 4 to directly determine the current thickness of the cloth 4. In another embodiment, the control unit 10 can capture the images of the cloth pressing element 33 and the feeding dog 19 from the image, and perform image recognition on the images of the cloth pressing element 33 and the feeding dog 19 to determine the pressing cloth The relative height between the element 33 and the feeding dog 19, and the current thickness of the cloth 4 is calculated based on the relative height.

The above are only preferred specific examples of the present invention, and are not limited to the scope of the patent of the present invention. Therefore, all equivalent changes made by using the content of the present invention are included in the scope of the present invention in the same way. Bright.

1: Sewing machine

10: Control unit

101: Algorithm

11: Operation interface

12: Motor drive unit

13: Motor

14: Sewing machine spindle

15: Cloth sensing unit

16: Setting interface

17: display interface

Claims (10)

A sewing machine with an automatic control mechanism for sewing a piece of cloth includes: an operating interface that accepts an external operation from a user to generate a control instruction; a control unit electrically connected to the operating interface, the control The unit transfers a control right of the sewing machine to the operation interface in a normal operation mode to receive the control command sent by the operation interface and generate a corresponding operation signal; a motor; a motor drive unit, electrically connected to the The control unit and the motor control an operating speed of the motor according to the operation signal; and a cloth sensing unit electrically connected to the control unit for sensing a current thickness of the cloth; wherein the control unit determines When the current thickness falls within a threshold value, it operates in the normal operation mode, and when it is determined that the current thickness exceeds the threshold value, it operates in a restricted operation mode; wherein, the control unit operates in the restricted operation mode of the sewing machine The control right is transferred from the operation interface to the control unit, and the control unit automatically generates and sends a deceleration signal to the motor drive unit. The motor drive unit replaces the operation signal with the deceleration signal to modify the motor's Operating speed. The sewing machine with an automatic control mechanism according to claim 1, wherein when the control unit determines that the current thickness falls within the threshold value, the restricted operation mode is restored to the normal operation mode and the control right of the operation interface is returned The operation interface is provided to regenerate and issue the operation signal according to the control command, and the motor drive unit restores the operation speed of the motor according to the operation signal. The sewing machine with an automatic control mechanism according to claim 1, which further includes: a platform for placing the cloth; a feed dog arranged on the bottom surface of the platform and rotating in a direction to move the cloth toward the direction Pushing; and a presser foot mechanism, which is set on the top surface of the platform, presses the cloth on the feed dog with a pressure amount, and generates displacement with the push of the cloth. The sewing machine with an automatic control mechanism according to claim 3, wherein the cloth sensing unit senses a displacement of the presser foot lifting mechanism, and the control unit calculates the current thickness of the cloth according to the displacement. The sewing machine with an automatic control mechanism according to claim 3, wherein the presser foot lifting mechanism includes a transmission shaft that moves up and down perpendicular to the platform, a pivot provided at one end of the transmission shaft, and a pivot through the pivot A cloth pressing element connected to the transmission shaft and capable of swinging based on the pivot, the cloth sensing unit senses a relative height change between the cloth pressing element and the feeding dog, and the control unit is based on the relative height The amount of change calculates the current thickness of the cloth. The sewing machine with an automatic control mechanism according to claim 3, wherein the cloth sensing unit is a camera, the camera captures an image of the cloth, and the control unit performs image recognition on the image to calculate the cloth The current thickness. An automatic control method for a sewing machine, applied to a sewing machine for sewing a cloth, includes: a) sensing a current thickness of the cloth by a cloth sensing unit of the sewing machine; b) receiving through an operating interface of the sewing machine An external operation by a user and generating a control command; c) A control unit of the sewing machine transfers a control right of the sewing machine to the operation interface in a normal operation mode to receive the control command and generate a corresponding operation signal according to the control command; d) the sewing machine A motor drive unit of receives the operation signal and controls an operating speed of a motor according to the operation signal; e) the control unit determines whether the current thickness exceeds a threshold value, wherein the control unit determines that the current thickness falls within Operate in the normal operation mode when the threshold is within; f) the control unit operates in a restricted operation mode when judging that the current thickness exceeds the threshold, and the control of the sewing machine is removed from the operation in the restricted operation mode The interface is transferred to the control unit, and the control unit automatically generates a deceleration signal; and g) the motor drive unit replaces the operation signal with the deceleration signal to modify the operating speed of the motor. The automatic control method according to claim 7, which further includes the following steps: h) when the control unit determines that the current thickness is restored to the threshold value, the limit operation mode is restored to the normal operation mode and the operation interface is returned The control right is given to the operation interface; i) the control unit regenerates the operation signal according to the control command issued by the operation interface; and j) the motor drive unit restores the operating speed of the motor according to the operation signal. The automatic control method according to claim 7, wherein the sewing machine further includes a platform for placing the cloth, a feed dog provided on the bottom surface of the platform, and a top surface of the platform with a pressing pressure A presser foot mechanism for pressing the cloth onto the feed dog; wherein, step e) is performed by the The cloth sensing unit senses a displacement of the presser foot mechanism due to the pushing of the cloth, and the control unit calculates the current thickness of the cloth according to the displacement. The automatic control method according to claim 7, wherein the sewing machine further includes a platform for placing the cloth, a feed dog provided on the bottom surface of the platform, and a top surface of the platform with a pressing pressure A presser foot lifting mechanism that presses the cloth onto the feed dog. The presser foot mechanism includes a drive shaft that moves up and down perpendicular to the platform, a pivot set at one end of the drive shaft, and The pivot is pivotally connected to a cloth pressing element of the transmission shaft; wherein, the step e) is that the cloth sensing unit senses a relative height change between the cloth pressing element and the cloth feed dog, and the The control unit calculates the current thickness of the cloth according to the relative height change.

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