CN111979647A - Sewing machine with automatic control mechanism and automatic control method thereof - Google Patents
Sewing machine with automatic control mechanism and automatic control method thereof Download PDFInfo
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- CN111979647A CN111979647A CN201910436496.XA CN201910436496A CN111979647A CN 111979647 A CN111979647 A CN 111979647A CN 201910436496 A CN201910436496 A CN 201910436496A CN 111979647 A CN111979647 A CN 111979647A
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- cloth
- sewing machine
- control unit
- motor
- control
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-controlled sewing machines
- D05B19/02—Sewing machines having electronic memory or microprocessor control unit
- D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
- D05B19/14—Control of needle movement, e.g. varying amplitude or period of needle movement
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/14—Needle-bar drives
Abstract
The invention discloses a sewing machine with an automatic control mechanism and an automatic control method thereof, the sewing machine with the automatic control mechanism is used for sewing cloth and at least comprises a control unit, an operation interface, a cloth sensing unit, a motor driving unit and a motor. The cloth sensing unit is used for sensing the thickness of the currently sewn cloth. When the thickness of the cloth falls within the threshold value, the control unit receives the indication of the operation interface and sends a corresponding operation signal to the motor driver, and the motor driver correspondingly controls the rotating speed of the motor according to the operation signal of the control unit. When the cloth sensing unit senses that the thickness of the cloth is changed, the control unit automatically generates a deceleration signal and sends the deceleration signal to the motor driver, and the motor driver replaces the original operation signal with the deceleration signal to change the rotating speed of the motor, so that the damage of the sewing machine caused by the over-thick cloth and the over-high rotating speed of the motor is avoided.
Description
Technical Field
The present invention relates to a sewing machine, and more particularly, to a sewing machine having an automatic control mechanism and an automatic control method of the sewing machine.
Background
Under normal conditions without special requirements, the operating technician of the sewing machine will usually operate the sewing machine at the highest operating speed, so as to operate the sewing machine at full speed and obtain the highest working efficiency. Under specific conditions, the operation technician can properly reduce the running speed of the sewing machine so as to prevent the sewing machine from generating the problem of stop of the production progress caused by damage of parts.
Specifically, when the sewing machine is in operation, the reaction force applied to the needle to pierce the fabric increases as the operating speed of the motor increases, and the reaction force applied to the needle increases as the thickness of the fabric increases. If the sewing machine controls the needle to pierce the cloth with a certain thickness under the high-speed operation of the motor, the generated reaction force may be larger than the force which can be borne by the needle, so that the needle is broken.
In order to prevent the needle from being broken during the operation of the sewing machine, an operation technician should observe the current thickness variation of the cloth material with his/her own vision and/or touch sense while the sewing machine is operating, rapidly reduce the operation speed of the sewing machine to prevent the needle from being broken when the cloth material becomes thick, and restore the operation speed of the sewing machine to ensure and maintain the production efficiency when the cloth material becomes thin.
As can be seen from the above description, the present sewing machines are highly dependent on the operating skill itself to operate with great attention and responsiveness so as to avoid the above problems. However, the high degree of attention and responsiveness will accelerate the fatigue level of the operation technician, and therefore, it is a subject of intensive research by those skilled in the art how to reduce the fatigue level of the operation technician while maintaining the production efficiency and quality.
Disclosure of Invention
The present invention is directed to a sewing machine with an automatic control mechanism and an automatic control method thereof, which can automatically control and change the operation speed of a motor according to the thickness of the currently sewn fabric.
In order to achieve the above object, the present invention provides a sewing machine with an automatic control mechanism, which mainly comprises:
an operation interface for receiving an external operation to generate a control command;
the control unit is electrically connected with the operation interface, receives the control instruction sent by the operation interface and generates a corresponding operation signal;
a motor;
a motor driving unit electrically connected to the control unit and the motor for controlling a rotation 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 a cloth;
the control unit automatically generates and sends a deceleration signal to the motor driving unit when judging that the current thickness exceeds a threshold value, and the motor driving unit replaces the operation signal with the deceleration signal to modify the running speed of the motor.
As described above, when the control unit returns a control right of the operation interface when determining that the current thickness falls within the threshold, the control unit regenerates and sends the operation signal according to the control command, and the motor driving unit recovers the operation speed of the motor according to the operation signal.
As mentioned above, the method further comprises:
a platform for placing the cloth;
the cloth feeding tooth is arranged on the bottom surface of the platform and rotates along a direction to push the cloth towards the direction; and
and the presser foot lifting mechanism is arranged on the top surface of the platform, presses the cloth on the cloth feeding tooth with a pressing force and generates displacement along with the pushing of the cloth.
As mentioned above, 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.
As described above, the presser foot lifting mechanism includes a transmission shaft moving up and down perpendicular to the platform, a pivot disposed at one end of the transmission shaft, and a cloth pressing element pivotally connected to the transmission shaft through the pivot and swinging based on the pivot, the cloth sensing unit senses a relative height variation between the cloth pressing element and the cloth feeding teeth, and the control unit calculates the current thickness of the cloth according to the relative height variation.
As mentioned above, the fabric sensing unit is a camera, the camera captures an image of the fabric, and the control unit performs image recognition on the image to calculate the current thickness of the fabric.
In order to achieve the above object, the present invention provides an automatic control method of a sewing machine, which mainly comprises the following steps:
a) sensing a current thickness of a cloth by a cloth sensing unit of the sewing machine;
b) receiving an external operation through an operation interface of the sewing machine and generating a control instruction;
c) a control unit of the sewing machine receives the control instruction and generates a corresponding operation signal according to the control instruction;
d) receiving the operation signal by a motor driving unit of the sewing machine, and controlling a running speed of a motor according to the operation signal;
e) The control unit judges whether the current thickness exceeds a threshold value;
f) the control unit automatically generates a deceleration signal when judging that the current thickness exceeds the threshold value; and
g) the motor driving unit replaces the operation signal with the deceleration signal to modify the operation speed of the motor.
As mentioned above, the method further comprises the following steps:
h) returning a control right of the operation interface when the control unit judges that the current thickness is recovered to be within the threshold value;
i) the control unit regenerates the operation signal according to the control instruction sent by the operation interface; and
j) the motor driving unit restores the running speed of the motor according to the operation signal.
As described above, the sewing machine further includes a platform for placing the cloth, a feed dog disposed on the bottom surface of the platform, and a presser foot lifting mechanism disposed on the top surface of the platform and pressing the cloth onto the feed dog with a pressing force; wherein, the cloth sensing unit senses a displacement of the presser foot lifting mechanism caused by the pushing of the cloth in the step e), and the control unit calculates the current thickness of the cloth according to the displacement.
As mentioned above, the sewing machine further includes a platform for placing the cloth, a feed dog disposed on the bottom surface of the platform, and a presser foot lifting mechanism disposed on the top surface of the platform and pressing the cloth onto the feed dog with a pressing force, the presser foot lifting mechanism includes a transmission shaft moving up and down perpendicular to the platform, a pivot disposed at one end of the transmission shaft, and a cloth pressing element pivotally connected to the transmission shaft through the pivot; in the step e), the cloth sensing unit senses a relative height variation between the cloth pressing element and the cloth feeding teeth, and the control unit calculates the current thickness of the cloth according to the relative height variation.
Compared with the related art, the invention can achieve the technical effect that the running speed of the motor is automatically controlled and limited according to the thickness of the cloth, thereby avoiding the problem that the sewing machine is damaged due to careless operation of an operation technician. Therefore, the invention can effectively assist manual operation, greatly reduce the requirements of the sewing machine on the proficiency, concentration and reaction of operating technicians, and maintain the production efficiency while avoiding the problems.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
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 sewing machine of the present invention;
FIG. 3 is a diagram illustrating a displacement signal according to a first embodiment of the present invention;
FIG. 4 is a first embodiment of a control flow diagram of the present invention;
FIG. 5 is a second embodiment of the sewing machine according to the present invention.
Wherein, the reference numbers:
1 … sewing machine;
10 … control unit;
101 … algorithm;
11 … operating interface;
12 … motor drive unit;
13 … a motor;
14 … sewing machine main shaft;
15 … cloth sensing unit;
16 … setting interface;
17 … display interface;
18 … platform;
19 … feed dog;
21 … needle bar;
22 … sewing needle;
3 … presser foot lifting mechanism;
31 … drive shaft;
32 … pivot;
33 … cloth pressing element;
4 … cloth;
5 … cloth sensing unit;
h1 … first height;
h2 … second height;
S10-S30 ….
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a first embodiment of a block diagram of a sewing machine according to the present invention is shown. The present invention discloses a sewing machine with an automatic control mechanism (hereinafter, referred to as sewing machine 1 for short in the specification), as shown in fig. 1, the sewing machine 1 at least comprises a control unit 10, and an operation interface 11, a motor driving unit 12 and a cloth sensing unit 15 which are electrically connected with the control unit 10.
The Control Unit 10 is mainly used for integrating electronic components inside the sewing machine 1 and transmitting corresponding electronic signals, and in an embodiment, the Control Unit 10 may be, for example, a Micro Control Unit (MCU), a Processor (Processor), or a System On a Chip (System On a Chip), without limitation.
The operation interface 11 may be a physical interface (e.g., an interface composed of physical buttons, switches, joysticks, etc.) or a virtual interface (e.g., a human-machine interface displayed on a screen), and a user may control the sewing machine 1 through the operation interface 11. In one embodiment, the sewing machine 1 can be controlled by a user (e.g., an operator) through the operation interface 11 to adjust parameters such as an operation mode and an operation speed of the sewing machine 1.
As shown in fig. 1, the motor driving unit 12 is electrically connected to a motor 13 of the sewing machine 1, and adjusts the operation speed of the motor 13 according to the control of the control unit 10.
Specifically, after the user operates the operation interface 11, the operation interface 11 generates a corresponding control command according to the operation behavior of the user, and transmits the control command to the control unit 10 (for example, sends an electronic signal to the control unit 10 by wire control). In the case of normal operation, the control right of the sewing machine 1 is preset to belong to the operation interface 11, i.e. the user can fully control the operation of the sewing machine 1 through the operation interface 11. In this case, the control unit 10 generates a corresponding operation signal according to the received control command, and transmits 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 receiving the operation signal from the control unit 10, the motor driving unit 12 outputs corresponding electric power to the motor 13 according to the operation signal, so as to drive the motor 13 to operate. The magnitude of the power output by the motor driving unit 12 corresponds to the content of the operation signal, so that the motor driving unit 12 can ensure that the motor 13 operates at a specific operation speed (i.e., the operation speed of the motor 13 corresponds to the operation behavior of the user).
As shown in fig. 1, the motor 13 is mainly installed on a main shaft 14 of the sewing machine, and the main shaft 14 of the sewing machine is driven by the operation of the motor 13 to control a sewing component (detailed later) on the sewing machine 1, thereby realizing a sewing action. In the present invention, the operation speed of the motor 13 corresponds to the operation efficiency of the sewing member (within a certain range, the faster the operation speed of the motor 13, the higher the operation efficiency of the sewing member can be achieved).
One technical feature of the present invention is that when the sewing machine 1 sews a fabric (e.g., the fabric 4 shown in fig. 2), the control unit 10 can actively or passively control the fabric sensing unit 15 to continuously sense the current thickness of the fabric 4, and switch the control right of the sewing machine 1 when sensing the change of the thickness of the fabric 4.
Specifically, the sewing machine 1 of the present invention can distinguish the operation mode into at least a normal operation mode and a restricted operation mode. In the normal operation mode, the control unit 10 gives the control right of the sewing machine 1 to the operation interface 11 (i.e., the user can control the sewing machine 1 at all), in other words, the user can directly control the operation speed of the motor 13 through the operation interface 11, thereby controlling the overall operation efficiency of the sewing machine 1.
As described above, if the thickness of the cloth 4 is too thick, the needle (e.g., the needle 22 shown in fig. 2) may be broken when the sewing machine 1 is operated at a high operation speed. In the present invention, the control unit 10 controls the cloth sensing unit 15 to continuously sense the thickness of the cloth 4, and when the thickness of the cloth 4 is not changed (i.e. the thickness is the same as the initial thickness) or does not exceed a preset threshold, the sewing machine 1 is operated in the normal operation mode (i.e. the control right is given to the operation interface 11). Moreover, the control unit 10 makes the sewing machine 1 operate in the limited operation mode when the cloth sensing unit 15 senses the thickness change (i.e. different from the initial thickness) of the cloth 4 or exceeds the threshold value.
In the operation limiting 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 controls the operation speed of the motor 13 according to the preset script, thereby limiting the sewing machine 1 to a specific operation efficiency. In other words, when the sewing machine 1 is in the restricted operation mode, the motor driving unit 12 only listens to the command of the control unit 10 to operate the motor 13 at a specific operation speed no matter what operation action the user performs on the operation interface 11.
In one embodiment, the specific operating speed is the fastest operating speed that will not cause the needle 22 to break at the current thickness of the cloth 4. The specific operating speed can be obtained from a manufacturer of the sewing machine 1 after a lot of experimental tests and is directly recorded in the firmware of the control unit 10, but not limited thereto.
Specifically, when the control unit 10 obtains the information related to the cloth 4 from the cloth sensing unit 15 and determines that the current thickness of the cloth 4 changes or exceeds a preset threshold, the control unit will automatically retrieve the control right of the sewing machine 1 from the operation interface 11, and automatically generate a set of deceleration signals, and transmit the generated deceleration signals to the motor driving unit 12. In the embodiment, the threshold corresponds to a specific thickness of the cloth 4, and when the motor 13 of the sewing machine 1 operates at the highest operation speed and the cloth 4 exceeds the specific thickness, the sewing needle 22 will be broken.
In the restricted operation mode, since the control right belongs to the control unit 10, after receiving the deceleration signal sent by the control unit 10 with the control right, the motor driving unit 12 replaces the originally obtained operation signal with the deceleration signal (or directly discards the operation signal), and modifies the operation speed of the motor 13 (i.e. modifies the output power) according to the content of the deceleration signal, thereby making the operation speed of the motor 13 meet the requirement of the restricted operation mode.
In one embodiment, the deceleration signal generated by the control unit 10 is the same every time the restricted operation mode is entered, so that the motor driving unit 12 drives the motor 13 to operate at the same operation speed every time the deceleration signal is received. In another embodiment, after entering the operation-restricted mode, the control unit 10 may generate a deceleration signal corresponding to the current thickness of the cloth 4, so that the motor driving unit 12 may drive the motor 13 to operate at the fastest operation speed without breaking the sewing needle 22.
Specifically, the control unit 10 may include an algorithm 101, and the algorithm 101 may obtain the sensing signal of the cloth sensing unit 15 and perform an operation on the sensing signal to determine the current thickness of the cloth 4. Further, the algorithm 101 may also perform a lookup table (lookup table) according to the current thickness, thereby generating the deceleration signal having a content corresponding to the current thickness. In this way, the control unit 10 can operate the motor 13 at the optimum operating speed by generating and sending the deceleration signal. However, the above description is only an exemplary embodiment of the present invention, and should not be construed as limiting the scope of the present invention.
In the present invention, the control unit 10 continuously obtains the sensing signal of the cloth sensing unit 15 no matter in the normal operation mode or the restricted operation mode. When the sewing machine 1 operates in the restricted operation mode and the control unit 10 determines that the current thickness of the cloth 4 is restored to the threshold value by the sensing signal, the control right of the sewing machine 1 is returned to the operation interface 11 (i.e., the user can control the sewing machine 1 again through the operation interface 11), so that the sewing machine 1 is restored to the normal operation mode.
Specifically, when the current thickness of the cloth 4 is restored to be within the threshold value, it represents that the thickness of the cloth 4 is thinned, and the sewing machine 1 no longer risks the breakage of the sewing needle 22, so the control unit 10 may allow the user to control the operation speed of the motor 13 by himself, i.e., allow the user to control the operation 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. And, the control unit 10 continuously receives the control command generated by the operation behavior of the user from the operation interface 11, and regenerates the operation signal according to the content of the control command. The motor driving unit 12 may discard the deceleration signal after the sewing machine 1 is restored to the normal operation mode, and adjust the output power according to the operation signal re-sent by the control unit 10, thereby restoring the operation speed of the motor 13.
As shown in fig. 1, the sewing machine 1 of the present invention further has a setting interface 16 and a display interface 17 electrically connected to the control unit 10. The setting interface 16 can be controlled by a user to set the related system control parameters of the sewing machine 1, so that the sewing machine 1 can be suitable for the system automatic control requirements of various states. The display interface 17 can be used to display various settings performed by the user through the setting interface 16, so that the user can clearly know the current system control parameters. The setting interface 16 and the display interface 17 may be a physical interface or a virtual interface, respectively, but are not limited thereto.
Referring to fig. 2, a first embodiment of the present invention is shown.
As shown in fig. 2, the sewing machine 1 of the present invention further has a table 18 horizontally disposed, and the table 18 is used for placing the cloth 4 to be sewn. As described above, the motor 13 of the sewing machine 1 is mainly installed in the sewing machine main shaft 14, and the sewing machine main shaft 14 is connected to the needle bar 21 vertically disposed with the platform 18 by an interlocking member (not shown), and the needle bar 21 is provided with the sewing needle 22 at an end close to the platform 18. When the motor 13 is operated, the sewing machine main shaft 14 is driven, and the sewing machine main shaft 14 drives the needle bar 21 and the needle 22 to move up and down, thereby sewing the cloth 4 on the table 18 by the needle 22.
As shown in fig. 2, the bottom surface of the platform 18 is provided with feed dogs 19, and the feed dogs 19 can penetrate through the bottom surface of the platform 18 to contact the cloth 4. When the sewing machine 1 is operated, the feed dog 19 is controlled to rotate in a first direction (i.e., arrow direction in fig. 2) to push the cloth 4 on the table 18 in the first direction. The top surface of the platform 18 is further provided with a presser foot lifting mechanism 3, the presser foot lifting mechanism 3 is controlled to apply the cloth 4 to the cloth feeding teeth 19 with a certain applying force, and the presser foot lifting mechanism 3 pushes the cloth 4 to generate displacement (mainly displacement in the up-down direction).
In one embodiment, the cloth sensing unit 15 of the present invention is disposed at a suitable position on the sewing machine 1, and senses the displacement of the presser foot lifting mechanism 3 mechanically or electronically (for example, directly connected or electrically connected to the presser foot lifting mechanism 3). More specifically, the cloth 4 is sandwiched between the presser foot lifting mechanism 3 and the feed dog 19, so that the height between the bottom surface of the presser foot lifting mechanism 3 and the top surface of the feed dog 19 is the current thickness of the cloth 4, and is the displacement of the presser foot lifting mechanism 3 in the Z-axis direction (i.e., the up-down direction). That is, when the current thickness of the cloth 4 becomes thick, the amount of displacement of the presser foot lifting mechanism 3 increases, and when the current thickness of the cloth 4 becomes thin, the amount of displacement of the presser foot lifting mechanism 3 decreases.
Please refer to fig. 3, which is a diagram illustrating a displacement signal according to a first embodiment of the present invention. Fig. 3 is a diagram illustrating an electrical 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 representing the displacement of the presser foot lifting mechanism 3.
As shown in fig. 3, when the thickness of the cloth 4 is changed (thickening is taken as an example in fig. 3), the displacement amount signal generated by the cloth sensing unit 15 is greatly changed along with the increase of the displacement amount of the presser foot lifting mechanism 3. In the present invention, the control unit 10 continuously receives the electronic signal generated after the sensing of the cloth sensing unit 15, and the electronic signal is analyzed and calculated by the algorithm 101, so as to calculate the current thickness of the cloth 4 according to the displacement of the presser foot lifting mechanism 3. 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 cloth 4.
In one embodiment, the control unit 10 controls the sewing machine 1 to enter the restricted operation mode (i.e., to withdraw the control right of the operation interface 11) as long as the thickness of the cloth 4 is determined to be changed according to the displacement signal and the thickness is increased. The control unit 10 controls the sewing machine 1 to resume the normal operation mode (i.e., returns the control right to the operation interface 11) when it is determined that the thickness of the cloth 4 is changed again according to the displacement signal and the thickness is reduced.
In another embodiment, the control unit 10 may preset a threshold (e.g., a displacement threshold corresponding to the displacement range or a thickness threshold corresponding to the thickness range). When the control unit 10 determines that the thickness of the cloth 4 is changed according to the displacement signal and the changed thickness 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 that the thickness of the cloth 4 is changed according to the displacement amount signal and the changed thickness is restored to the threshold value, the sewing machine 1 is controlled to restore the normal operation mode.
Returning to fig. 2. The presser foot lifting mechanism 3 mainly includes a transmission shaft 31 vertically movable with respect to the platform 18, a pivot shaft 32 provided at an end of the transmission shaft adjacent to the platform 18, and a cloth pressing member 33 pivotally connected to the transmission shaft 31 via the pivot shaft and swingable based on the pivot shaft 32. In the present embodiment, the presser foot lifting mechanism 3 mainly presses the cloth 4 against the feed dog 19 via the cloth pressing member 33. The distance between the presser foot lifting mechanism 3 and the feed dog 19 in the present embodiment is a distance between the bottom surface of the presser element 33 and the top surface of the feed dog 19.
In one embodiment, the cloth sensing unit 15 mainly continuously senses the relative height variation between the cloth pressing element 33 and the cloth feeding tooth 19, that is, the electronic signal generated by the cloth sensing unit 15 may also be a variation signal representing the height variation. After the control unit 10 receives the electronic signal from the cloth sensing unit 15, the electronic signal (i.e., the relative height variation) is analyzed and calculated by the algorithm 101, so as to obtain the current thickness of the cloth 4.
As shown in fig. 2, since the presser foot lifting mechanism 3 presses the cloth 4 against the feed dog 19 via the cloth pressing element 33, the distance between the cloth pressing element 33 and the feed dog 19 (i.e., the first height H1) is the current thickness of the cloth 4. When the cloth 4 becomes thick, the distance between the cloth presser 33 and the feed dog 19 changes to the second height H2. In this embodiment, the cloth sensing unit 15 senses a variation of the second height H2 relative to the first height H1, and generates the electronic signal according to the variation.
In the above embodiment, the control unit 10 can determine that the current thickness of the cloth 4 is within the threshold when the distance between the cloth pressing element 33 and the feed dog 19 is the first height H1, so as to maintain the sewing machine 1 in the normal operation mode. When the distance between the cloth pressing member 33 and the feed dog 19 is changed to the second height H2, the control unit 10 determines that the current thickness of the cloth 4 is changed and exceeds the threshold, thereby causing the sewing machine 1 to enter the restricted operation mode. When the distance between the cloth pressing member 33 and the feed 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 is restored to the threshold value, thereby restoring the sewing machine 1 to the normal operation mode. It can be seen that the technical solution of the present invention is quite convenient to maintain the operation efficiency of the sewing machine 1 and to avoid the risk of breaking the sewing needle 22 by the automatic control program of the sewing machine 1 without depending on the high concentration and reaction of the user.
Please refer to fig. 4, which is a control flow chart according to a first embodiment of the present invention. The present invention further discloses an automatic control method, which is mainly applied to the sewing machine 1 shown in fig. 1 and 2. By the automatic control method of the invention, the user of the sewing machine 1 can automatically monitor the current thickness of the cloth by the sewing machine 1 without paying high attention and reaction capability, and automatically limit the running speed of the motor according to the current thickness, thereby avoiding the problem of needle breakage caused by over-thick cloth and over-high running speed of the motor.
As shown in fig. 4, to use the automatic control method of the present invention, first, the user 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 one embodiment, the cloth sensing unit 15 senses the variation of the 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 variation of the displacement. In another embodiment, the cloth sensing unit 15 senses the relative height variation between the cloth pressing element 33 and the feed dog 19 in step S12, and the control unit 10 calculates the current thickness of the cloth 4 according to the relative height variation.
It should be noted that the control unit 10 may automatically control the cloth sensing unit 15 to start sensing the cloth 4 after the sewing machine 1 is powered on, or enable the cloth sensing unit 15 according to the control of the user after the user triggers the sensing function of the sewing machine 1, which 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 (step S14). In one embodiment, the threshold is the thickness of the fabric that would cause the needle 22 to break at the highest operating speed of the motor 13. However, the above is only one embodiment of the present invention, and should not be taken as a limitation.
If the current thickness of the cloth 4 does not exceed the threshold, in the present embodiment, the control unit 10 will give the control right of the sewing machine 1 to the operation interface 11 (step S16), i.e. the sewing machine 1 is in the normal operation mode. In the normal operation mode, the user can control the sewing machine 1 comprehensively through the operation interface 11, that is, the user can adjust the operation speed of the motor 13 (i.e., the operation efficiency of the sewing machine 1) at will.
In the normal operation mode, the control unit 10 continuously receives the control command generated by the operation behavior of the user through the operation interface 11 (step S18), generates a corresponding operation signal according to the content of the control command, and transmits the generated operation signal to the motor driving unit 12 (step S20). The motor driving unit 12 may receive the operation signal from the control unit 10 and output corresponding power to the motor 13 according to the content of the operation signal to control the operation speed of the motor 13, so that the operation speed of the motor 13 conforms to the operation behavior of the user (step S22).
If it is determined in step S14 that the current thickness of the cloth 4 exceeds the threshold, the control unit 10 retrieves the control right of the sewing machine 1 from the operation interface 11 (S24), so as to enable the sewing machine 1 to enter the restricted operation mode from the normal operation mode. In the restricted operation mode, the control unit 10 automatically generates a deceleration signal according to a predetermined script and transmits the deceleration signal to the motor driving unit 12 (step S26). After receiving the deceleration signal from the control unit 10, the motor driving unit 12 replaces the previously obtained operation signal with the deceleration signal and modifies the output power accordingly, thereby modifying the operation speed of the motor 13 so that the operation speed of the motor 13 matches the content of the deceleration signal sent by the control unit 10 (step S28).
It should be noted that, in the restricted operation mode, the user can still continuously operate the operation interface 11, and the operation interface 11 can continuously generate and send the control command according to the operation behavior of the user. However, since the control right of the sewing machine 1 is on the control unit 10 during the restricted operation mode, the control unit 10 disregards the control command sent from the operation interface 11 (or discards the control command after receiving), and controls the motor driving unit 12 by the deceleration signal generated by itself.
In the present invention, the content of the deceleration signal mainly corresponds to the highest operating speed of the motor 13 that will not cause the breakage of the sewing needle 22 under the currently sensed thickness of the cloth. In other words, as long as the motor driving unit 12 controls the operation speed of the motor 13 according to the content of the deceleration signal, there is no case where the sewing needle 22 is broken due to the current thickness of the cloth 4 being too thick. However, the above is only one embodiment of the present invention, and should not be taken as a limitation.
In one embodiment, the control unit 10 may generate the deceleration signal with the same content after entering the restricted operation mode, so as to restrict the motor 13 from operating at the same operation speed.
In another embodiment, after entering the limited operation mode, the control unit 10 may calculate the current thickness of the cloth 4 by the algorithm 101 to obtain the highest operation speed that does not cause the breakage of the sewing needle 22 at the thickness, and generate the deceleration signal according to the highest operation speed. In this embodiment, although the sewing machine 1 is operated in the restricted operation mode, the motor 13 can change its operation speed according to the current thickness of the cloth 4, thereby effectively maintaining the operation efficiency of the sewing machine 1.
During the operation of the sewing machine 1, the control unit 10 continuously determines whether the operation of the user is finished (step S30), and continuously executes the steps S12 to S28 before the operation is finished, so that the sewing machine 1 repeatedly and dynamically switches between a normal operation mode in which the rotation speed of the motor is controlled by the user and a restricted operation mode in which the rotation speed of the motor is automatically controlled by the system according to the current thickness of the cloth 4.
It should be noted that, if the sewing machine 1 operates in the limited operation mode and the control unit 10 determines in step S14 that the current thickness of the cloth 4 is restored to the threshold value, the control unit 10 further returns the control right to the operation interface 11 and regenerates the operation signal according to the control command sent by the operation interface 11. After the operation signal is obtained from the control unit 10, the motor driving unit 12 replaces the previously obtained deceleration signal with the operation signal to modify the output power, thereby restoring the operation speed of the motor 13, so that the operation speed of the motor 13 conforms to the operation behavior of the user again.
By the automatic control method of the invention, the sewing machine can enable a user to completely master the control right of the sewing machine 1 when the thickness of the cloth is thinner so as to obtain the optimal operation efficiency; when the cloth becomes thick, the sewing machine can automatically control and limit the running speed of the motor, thereby avoiding the problem of needle breakage in an automatic control mode on the premise of not excessively depending on the attention and reaction of a user.
Please refer to fig. 5, which is a second embodiment of the present invention.
In the above embodiment, the cloth sensing unit 15 mainly senses the displacement (or the relative height variation) of the presser foot lifting mechanism 3 and generates a corresponding electronic signal, so that the control unit 10 calculates the current thickness of the cloth 4. In the present embodiment, another cloth sensing unit 5 is disclosed, 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 is mainly disposed at one side of the platform 18 and performs an image capturing operation toward the placement position of the cloth 4. The control unit 10 can control the cloth sensing unit 5 to continuously capture the image of the cloth 4 during the operation of the sewing machine 1, and the control unit 10 can perform image recognition on the image of the cloth 4 through an image recognition algorithm, so as to judge the current thickness of the cloth 4 according to the recognition result.
In one embodiment, the control unit 10 can capture an image of the fabric 4 from the image and perform image recognition on the image of the fabric 4 to directly determine the current thickness of the fabric 4. In another embodiment, the control unit 10 can extract the image of the cloth pressing member 33 and the feed dog 19 from the image, perform image recognition on the image of the cloth pressing member 33 and the feed dog 19 to determine the relative height between the cloth pressing member 33 and the feed dog 19, and then calculate the current thickness of the cloth 4 according to the relative height.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A sewing machine with an automatic control mechanism is used for sewing a cloth, and is characterized by comprising:
an operation interface for receiving an external operation to generate a control command;
the control unit is electrically connected with the operation interface, receives the control instruction sent by the operation interface and generates a corresponding operation signal;
A motor;
a motor driving unit electrically connected to the control unit and the motor for controlling a rotation 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;
the control unit automatically generates and sends a deceleration signal to the motor driving unit when judging that the current thickness exceeds a threshold value, and the motor driving unit replaces the operation signal with the deceleration signal to modify the running speed of the motor.
2. The sewing machine of claim 1, wherein the control unit returns a control right of the operation interface when determining that the current thickness falls within the threshold, and regenerates and sends the operation signal according to the control command, and the motor driving unit restores the operation speed of the motor according to the operation signal.
3. The sewing machine with automatic control mechanism as claimed in claim 1, further comprising:
a platform for placing the cloth;
the cloth feeding tooth is arranged on the bottom surface of the platform and rotates along a direction to push the cloth towards the direction; and
And the presser foot lifting mechanism is arranged on the top surface of the platform, presses the cloth on the cloth feeding tooth with a pressing force and generates displacement along with the pushing of the cloth.
4. The sewing machine with automatic control mechanism as claimed in 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.
5. The sewing machine with automatic control mechanism as claimed in claim 3, wherein the presser foot lifting mechanism comprises a transmission shaft moving up and down perpendicular to the platform, a pivot shaft disposed at one end of the transmission shaft, and a cloth pressing element pivoted to the transmission shaft through the pivot shaft and capable of swinging based on the pivot shaft, the cloth sensing unit senses a relative height variation between the cloth pressing element and the feed dog, and the control unit calculates the current thickness of the cloth according to the relative height variation.
6. The sewing machine of 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 current thickness of the cloth.
7. An automatic control method of a sewing machine, which is applied to a sewing machine for sewing a cloth, is characterized by comprising the following steps:
a) sensing a current thickness of the cloth by a cloth sensing unit of the sewing machine;
b) receiving an external operation through an operation interface of the sewing machine and generating a control instruction;
c) a control unit of the sewing machine receives the control instruction and generates a corresponding operation signal according to the control instruction;
d) receiving the operation signal by a motor driving unit of the sewing machine, and controlling a running speed of a motor according to the operation signal;
e) the control unit judges whether the current thickness exceeds a threshold value;
f) the control unit automatically generates a deceleration signal when judging that the current thickness exceeds the threshold value; and
g) the motor driving unit replaces the operation signal with the deceleration signal to modify the operation speed of the motor.
8. The automatic control method of claim 7, further comprising the steps of:
h) returning a control right of the operation interface when the control unit judges that the current thickness is recovered to be within the threshold value;
i) the control unit regenerates the operation signal according to the control instruction sent by the operation interface; and
j) The motor driving unit restores the running speed of the motor according to the operation signal.
9. The automatic control method according to claim 7, wherein the sewing machine further comprises a platform for placing the cloth, a feed dog disposed on a bottom surface of the platform, and a presser foot lifting mechanism disposed on a top surface of the platform and pressing the cloth against the feed dog with a pressing force; wherein, the cloth sensing unit senses a displacement of the presser foot lifting mechanism caused by the pushing of the cloth in the step e), and the control unit calculates the current thickness of the cloth according to the displacement.
10. The automatic control method according to claim 7, wherein the sewing machine further comprises a platform for placing the cloth, a feed dog disposed on a bottom surface of the platform, and a presser foot lifting mechanism disposed on a top surface of the platform and pressing the cloth against the feed dog with a pressing force, the presser foot lifting mechanism comprising a transmission shaft moving up and down perpendicular to the platform, a pivot disposed at one end of the transmission shaft, and a cloth pressing element pivotally connected to the transmission shaft through the pivot; in the step e), the cloth sensing unit senses a relative height variation between the cloth pressing element and the cloth feeding teeth, and the control unit calculates the current thickness of the cloth according to the relative height variation.
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