CN112064218A - Front trimming control method - Google Patents
Front trimming control method Download PDFInfo
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- CN112064218A CN112064218A CN201910501646.0A CN201910501646A CN112064218A CN 112064218 A CN112064218 A CN 112064218A CN 201910501646 A CN201910501646 A CN 201910501646A CN 112064218 A CN112064218 A CN 112064218A
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
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Abstract
The invention provides a front trimming control method, which is characterized in that an electric control module judges whether a middle stop exists after starting sewing: if the intermediate parking exists, the electric control module judges whether the front trimming is finished in the process from the seam starting to the intermediate parking: if the front trimming is finished, the electronic control module controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing machine is stopped and then sewn until the sewing is finished; if the front thread trimming is not finished, the electronic control module controls the rotating speed of a main motor of the sewing machine according to signals of the speed regulator when the sewing machine is stopped in the middle and then sewn until the sewing is finished, and controls the action of the thread trimming driving source after the sewing machine is stopped in the middle and the preset thread trimming time Tm is reached, so that the front thread trimming is finished. The rotating speed of a main motor of the sewing machine is controlled according to a signal of the speed regulator after the middle stop, so that the blocking phenomenon is avoided; meanwhile, the electric control module controls the cutting time of the thread trimming assembly according to the actual thread trimming time T or the thread trimming time Tm, so that the front thread trimming effect of the short thread end is realized, and the user experience is improved.
Description
Technical Field
The invention relates to the field of sewing machines, in particular to a front trimming control method.
Background
The overedger needs to trim a front wire braid formed at the front edge of the sewing material during starting sewing and needs to trim a rear wire braid formed at the rear edge of the sewing material after sewing is finished, and some sewing processes provide the requirement of short wire ends on wire cutting so as to improve the sewing quality and efficiency. At present, in a front and rear thread trimming control method of an overlock sewing machine, a sewing material passes through an inductor, a certain needle number is delayed, and then a front thread trimming action and a rear thread trimming action are executed, so that the front and rear thread trims are completed, and the effect of short thread ends is achieved.
Further, chinese patent application No. 201810552290.9 discloses a trimming control method for a sewing machine, which performs compensation calculation on trimming time according to the current sewing parameters of the sewing machine to achieve the effect of stable front trimming and rear short thread ends; the current sewing parameters of the sewing machine comprise the current rotating speed, namely the electric control module can acquire the motor speed when the sewing material passes through the sensor for controlling the front trimming, and the sewing machine stably runs at the motor speed until the sewing machine starts to accelerate after the front trimming is finished.
However, for some sewing processes, for example: paste processes such as the straight technique of cloth is smoothed out after parking in the middle of needs such as trade mark, the car worker low-speed sewing several needles earlier, then the middle parking is and is placed a section surface fabric, later when sewing again, if the cloth shelters from the inductor that is used for preceding trimming control, and do not accomplish preceding trimming before the middle parking, then electric control module control sewing machine sews with the low-speed of memory before this, it is with higher speed according to the signal of speed regulator again after the trimming is accomplished to electric control module judgement, can bring the obvious card pause phenomenon of customer this moment, lead to user experience degree poor.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a front trimming control method, which introduces the signal of the speed governor into the logic judgment, and can ensure the effect of the front trimming stub while solving the stuck phenomenon.
In order to achieve the above object, the present invention provides a front trimming control method for a sewing machine, the sewing machine has an electronic control module, a main motor, a detection sensor for front trimming control, a speed regulator for a user to give a rotation speed instruction, and a trimming assembly for trimming, the main motor, the detection sensor, the speed regulator, and a trimming driving source in the trimming assembly are all connected to the electronic control module, and the front trimming control method sequentially includes the following steps:
s1, starting sewing and starting a front trimming compensation function;
s2, the electric control module judges that the detection sensor is covered by the sewing material according to the feedback signal of the detection sensor, and the electric control module automatically calculates the actual thread cutting time T;
s3, judging whether a middle stop exists by the electronic control module after starting sewing according to the signal of the speed regulator:
s31, if no intermediate stop exists, the electric control module controls the action of the thread cutting driving source according to the actual thread cutting time T to finish front thread cutting, and then the electric control module controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator until the sewing is finished;
s32, if there is middle parking, the electric control module judges whether the front trimming is finished in the process from the starting to the middle parking: if the front trimming is finished, the electronic control module controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing machine is stopped and then sewn until the sewing is finished; if the front thread trimming is not finished, the electronic control module controls the rotating speed of a main motor of the sewing machine according to signals of the speed regulator when the sewing machine is stopped in the middle and then sewn until the sewing is finished, and controls the action of the thread trimming driving source after the sewing machine is stopped in the middle and the preset thread trimming time Tm is reached, so that the front thread trimming is finished.
Further, in step S32, the manner of determining whether front trimming is completed during the period from starting to middle parking by the electronic control module is as follows: the electronic control module obtains the time T1 when the sewing material covers the detection sensor, the electronic control module obtains the time T2 when the speed regulator is reset, and when T2-T1 is less than T, the electronic control module judges that front trimming is finished in the process from sewing to intermediate parking; when T2-T1 is larger than or equal to T, the electric control module judges that front trimming is not finished in the process from starting to middle parking.
Further, in step S3, the electronic control module determines whether there is a middle stop according to the signal of the governor: when the speed regulator has reset action, the electric control module judges that intermediate stop exists; when the speed regulator has no reset action, the electronic control module judges that no intermediate stop exists.
Further, the speed regulator is a pedal of the sewing machine.
Further, the actual trimming time T is calculated in the following manner: and T/(P N) -Tc, wherein L is the distance between the detection sensor and the thread cutting mechanism, P is the current needle pitch of the sewing machine, N is the current rotating speed of a main motor of the sewing machine when the sewing material passes through the detection sensor, and Tc is the response time of the detection sensor.
Further, the detection sensor comprises a first sensor and a second sensor, and the first sensor, the second sensor and the thread cutting assembly are sequentially arranged from back to front along the forward moving direction of the sewing material when the sewing machine sews.
Further, one or only one of the first sensor and the second sensor is turned on.
Further, the first sensor is mounted on a sewing table of the sewing machine, and the second sensor is mounted on a needle plate of the sewing machine.
Further, the thread cutting time Tm is 0-2 needle count time.
As described above, the front trimming control method according to the present invention has the following advantageous effects:
the rotating speed of a main motor of the sewing machine is controlled according to a signal of the speed regulator after the middle stop, so that the blocking phenomenon is avoided; meanwhile, the electric control module controls the cutting time of the thread trimming assembly according to the actual thread trimming time T or the thread trimming time Tm, so that the front thread trimming effect of the short thread end is realized, and the user experience is improved.
Drawings
Fig. 1 is a schematic view of a sewing machine according to the present application.
Fig. 2 is a flowchart of a front trimming control method according to a first embodiment of the present application.
Fig. 3 is a flowchart of a second embodiment of a front trimming control method in the present application.
Description of the element reference numerals
1 case
2-stitch sewing machine
3 electric control module
4 thread trimming assembly
5 transmitter assembly
6 first inductor
7 second inductor
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.
The invention provides a front trimming control method for a sewing machine, which is preferably an overlock machine. As shown in fig. 1, the sewing machine has a machine case 1, a sewing table 2, an electric control module 3 installed on the right end face of the machine case 1, a main motor installed on the machine case 1, a detection sensor for front thread trimming control, a speed governor for a user to give a rotational speed instruction, a thread trimming assembly 4 for performing thread trimming, and a transmitter assembly 5 installed on the left end of the machine case 1; the detection sensor for controlling the front trimming comprises a first sensor 6 and a second sensor 7, wherein the first sensor 6, the second sensor 7 and the trimming component 4 are sequentially arranged from back to front along the direction of forward movement of the sewing material when the sewing machine sews; the main motor, the first inductor 6, the second inductor 7, the speed regulator, the wire cutting driving source in the wire cutting assembly 4 and the emitter assembly 5 are all connected with the electronic control module 3. The first sensor 6 is arranged on a sewing table 2 of the sewing machine, the second sensor 7 is arranged on a needle plate of the sewing machine, and sewing materials sequentially pass through the first sensor 6 and the second sensor 7 during sewing. The electronic control module 3 controls the first sensor 6 and the second sensor 7 to be switched on or off by controlling the switches of the emitters in the emitter assembly 5; of course, in other embodiments, the electronic control module 3 can directly control the on or off of the first sensor 6 and the second sensor 7. Further, in order to avoid mutual interference of signals between the first sensor 6 and the second sensor 7, in the front trimming control method, only one of the first sensor 6 and the second sensor 7 is turned on. The following provides two preferred embodiments of the front trim control method.
In the first embodiment of the front trimming control method, the electronic control module 3 controls the first sensor 6 to be turned on and the second sensor 7 to be turned off.
As shown in fig. 2, a first embodiment of the front trimming control method sequentially includes the following steps:
step S1, starting sewing, and starting a front trimming compensation function, wherein after the front trimming compensation function is started, the electric control module 3 controls the trimming component 4 to execute the actual trimming time T of the front trimming action, which is automatically calculated by the electric control module 3, so that the front trimming effect of the short thread end is realized; meanwhile, the electric control module 3 identifies the working states of the first sensor 6 and the second sensor 7, so that subsequent control is facilitated.
Step S2, the electric control module 3 judges that the first sensor 6 is covered by the sewing material according to the feedback signal of the first sensor 6, namely, whether the front edge of the sewing material passes through the first sensor 6 or not is judged, the front edge of the sewing material is identified by the first sensor 6, and the electric control module 3 automatically calculates the actual thread cutting time T; the actual trimming time T is the compensated front trimming cutting time, and the calculation mode is as follows: t is L1/(P × N1) -Tc1, L1 is the distance between the first sensor 6 and the cutting edge of the thread cutting mechanism in the front-rear direction, P is the current needle pitch of the sewing machine, N1 is the current rotation speed of the main motor of the sewing machine when the front edge of the sewing material passes through the first sensor 6, Tc1 is the response time of the first sensor 6, L1 and Tc1 are known quantities, both stored in advance in the electronic control module 3, and both P and N1 are known quantities, and are automatically obtained by the electronic control module 3.
Step S3, the electronic control module 3 judges whether there is a middle stop after starting up the seam:
step S31, if there is no intermediate stop, the electronic control module 3 controls the action of the thread trimming driving source according to the actual thread trimming time T, that is: the electric control module 3 starts timing when judging that the front edge of the sewing material passes through the first inductor 6, immediately controls the action of the thread trimming driving source after the actual thread trimming time T is timed, finishes front thread trimming, realizes the front thread trimming effect of the short thread head, and then the electric control module 3 controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator until the sewing is finished.
Step S32, if there is a middle stop, the electronic control module 3 determines whether the front trimming is completed in the process from the start to the middle stop:
if the front thread trimming is finished, the electronic control module 3 immediately controls a thread trimming driving source to act after judging that the actual thread trimming time T is met when the front edge of the sewn material passes through the first inductor 6 after starting sewing, so that the front thread trimming effect of the short thread head is realized, and then the electronic control module 3 controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing machine stops in the middle and finishes sewing, so that a user cannot feel a pause phenomenon when the sewing machine stops in the middle and then sews;
if the front trimming is not finished, the electric control module 3 controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing is finished after the middle stop, and a user cannot feel the pause phenomenon; particularly, the front edge of the sewing material is close to the cutting edge of the thread trimming component 4, so that the electric control module 3 controls the action of the thread trimming driving source after the sewing is finished for the preset thread trimming time Tm after the middle stop, the front thread trimming is finished, and the front thread trimming effect of the short thread head is realized; the trimming time Tm is stored in advance in the electronic control module 3.
In step S32, the manner of determining whether or not the front trimming is completed during the period from the start of sewing to the middle stop by the electronic control module 3 is as follows: judging whether front trimming is finished or not according to whether a trimming signal is sent out or not in the process from the seam starting to the middle parking of the electric control module 3; in the second mode, the electronic control module 3 acquires the time T1 when the first sensor 6 is covered by the sewing material, and the time T1 when the first sensor 6 is covered by the sewing material is also the time when the front edge of the sewing material passes through the first sensor 6; the electronic control module 3 acquires the time T2 when the speed governor is reset, and the time T2 when the speed governor is reset is also the time of intermediate parking; when T2-T1 is less than T, the electric control module 3 judges that front trimming is finished in the process from starting to middle parking; when T2-T1 is more than or equal to T, the electric control module 3 judges that the front trimming is not finished in the process from the starting to the middle parking.
In the second embodiment of the front trimming control method, the electronic control module 3 controls the first sensor 6 to be turned off and the second sensor 7 to be turned on.
As shown in fig. 3, the second embodiment of the front trimming control method sequentially includes the following steps:
step S1, starting sewing, and starting a front trimming compensation function, wherein after the front trimming compensation function is started, the electric control module 3 controls the trimming component 4 to execute the actual trimming time T of the front trimming action, which is automatically calculated by the electric control module 3, so that the front trimming effect of the short thread end is realized; meanwhile, the electric control module 3 identifies the working states of the first sensor 6 and the second sensor 7, so that subsequent control is facilitated.
Step S2, the electric control module 3 judges that the second sensor 7 is covered by the sewing material according to the feedback signal of the second sensor 7, namely, whether the front edge of the sewing material passes through the second sensor 7 or not is judged, the front edge of the sewing material is identified by the second sensor 7, and the electric control module 3 automatically calculates the actual thread cutting time T; the actual trimming time T is the compensated front trimming cutting time, and the calculation mode is as follows: t is L2/(P × N2) -Tc2, L2 is the distance between the second sensor 7 and the cutting edge of the thread cutting mechanism in the front-rear direction, P is the current needle pitch of the sewing machine, N2 is the current rotation speed of the main motor of the sewing machine when the front edge of the sewing material passes through the second sensor 7, Tc2 is the response time of the second sensor 7, L2 and Tc2 are both known quantities and are both stored in the electronic control module 3 in advance, and P and N2 are both known quantities and are automatically obtained by the electronic control module 3.
Step S3, the electronic control module 3 judges whether there is a middle stop after starting up the seam:
step S31, if there is no intermediate stop, the electronic control module 3 controls the action of the thread trimming driving source according to the actual thread trimming time T, that is: the electric control module 3 starts timing when judging that the front edge of the sewing material passes through the second inductor 7, immediately controls the action of the thread trimming driving source after the actual thread trimming time T is timed, finishes front thread trimming, realizes the front thread trimming effect of the short thread head, and then the electric control module 3 controls the rotating speed of the main motor of the sewing machine according to the signal of the speed regulator until the sewing is finished.
Step S32, if there is a middle stop, the electronic control module 3 determines whether the front trimming is completed in the process from the start to the middle stop:
if the front thread trimming is finished, the electronic control module 3 immediately controls a thread trimming driving source to act after judging that the front edge of the sewn material passes through the second inductor 7 and the actual thread trimming time T is full after starting sewing, so that the front thread trimming effect of the short thread head is realized, and then the electronic control module 3 controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing machine stops in the middle and then sews until the sewing is finished, so that a user cannot feel the pause phenomenon when the sewing machine stops in the middle and then sews;
if the front trimming is not finished, the electric control module 3 controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing is finished after the middle stop, and a user cannot feel the pause phenomenon; particularly, the front edge of the sewing material is close to the cutting edge of the thread trimming component 4, so that the electric control module 3 controls the action of the thread trimming driving source after the sewing is finished for the preset thread trimming time Tm after the middle stop, the front thread trimming is finished, and the front thread trimming effect of the short thread head is realized; the trimming time Tm is stored in advance in the electronic control module 3.
In step S32, the manner of determining whether or not the front trimming is completed during the period from the start of sewing to the middle stop by the electronic control module 3 is as follows: judging whether front trimming is finished or not according to whether a trimming signal is sent out or not in the process from the seam starting to the middle parking of the electric control module 3; in the second mode, the electronic control module 3 acquires the time T1 when the second sensor 7 is covered by the sewing material, and the time T1 when the second sensor 7 is covered by the sewing material is also the time when the front edge of the sewing material passes through the second sensor 7; the electronic control module 3 acquires the time T2 when the speed governor is reset, and the time T2 when the speed governor is reset is also the time of intermediate parking; when T2-T1 is less than T, the electric control module 3 judges that front trimming is finished in the process from starting to middle parking; when T2-T1 is more than or equal to T, the electric control module 3 judges that the front trimming is not finished in the process from the starting to the middle parking.
Therefore, after the sewing machine is stopped in the middle, the rotating speed of the main motor of the sewing machine is controlled according to the signal of the speed regulator, and the blocking phenomenon is avoided; meanwhile, a signal of the speed regulator is added during front trimming to judge whether front trimming is finished in the process from starting to stopping in the middle, and then the electric control module 3 is convenient to control the cutting time of the trimming component 4 according to the actual trimming time T or the trimming time Tm, so that the front trimming effect of the stub is realized, the pause phenomenon in the compensation control of the front trimming is intelligently solved, the front trimming effect of the stub is ensured, and the user experience is greatly improved.
Further, the trimming time Tm in the first embodiment of the front trimming control method relates to the distance L1 from the first sensor 6 to the edge position of the trimming mechanism, and the trimming time Tm in the second embodiment of the front trimming control method relates to the distance L2 from the second sensor 7 to the edge position of the trimming mechanism, so the trimming time Tm in the first embodiment of the front trimming control method is different from the trimming time Tm in the second embodiment of the front trimming control method. Preferably, the thread trimming time Tm is a time of 0-2 stitches, i.e. a time required for the sewing machine to move 0-2 stitches, and the magnitude of the parameter value of the thread trimming time Tm can be automatically correlated with the turning on of the first sensor 6 or the second sensor 7.
Further, in both embodiments of the front trimming control method, the speed regulator is a pedal of the sewing machine. The electric control module 3 judges whether a middle stop exists according to the signal of whether the speed regulator has the reset action, and the specific judgment mode is as follows: when the speed regulator has a reset action, the electronic control module 3 judges that a middle stop exists; when the speed regulator has no resetting action, the electronic control module 3 judges that no intermediate stop exists.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A front trimming control method is used for a sewing machine, the sewing machine is provided with an electric control module, a main motor, a detection sensor for front trimming control, a speed regulator for a user to give a rotating speed instruction, and a trimming assembly for executing trimming, and trimming driving sources in the main motor, the detection sensor, the speed regulator and the trimming assembly are all connected with the electric control module, and the front trimming control method is characterized in that: the front trimming control method sequentially comprises the following steps:
s1, starting sewing and starting a front trimming compensation function;
s2, the electric control module judges that the detection sensor is covered by the sewing material according to the feedback signal of the detection sensor, and the electric control module automatically calculates the actual thread cutting time T;
s3, judging whether a middle stop exists by the electronic control module after starting sewing according to the signal of the speed regulator:
s31, if no intermediate stop exists, the electric control module controls the action of the thread cutting driving source according to the actual thread cutting time T to finish front thread cutting, and then the electric control module controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator until the sewing is finished;
s32, if there is middle parking, the electric control module judges whether the front trimming is finished in the process from the starting to the middle parking: if the front trimming is finished, the electronic control module controls the rotating speed of a main motor of the sewing machine according to the signal of the speed regulator when the sewing machine is stopped and then sewn until the sewing is finished; if the front thread trimming is not finished, the electronic control module controls the rotating speed of a main motor of the sewing machine according to signals of the speed regulator when the sewing machine is stopped in the middle and then sewn until the sewing is finished, and controls the action of the thread trimming driving source after the sewing machine is stopped in the middle and the preset thread trimming time Tm is reached, so that the front thread trimming is finished.
2. The front trimming control method according to claim 1, wherein: in step S32, the manner of judging whether front trimming is completed in the process from the starting to the middle parking by the electronic control module is as follows: the electronic control module obtains the time T1 when the sewing material covers the detection sensor, the electronic control module obtains the time T2 when the speed regulator is reset, and when T2-T1 is less than T, the electronic control module judges that front trimming is finished in the process from sewing to intermediate parking; when T2-T1 is larger than or equal to T, the electric control module judges that front trimming is not finished in the process from starting to middle parking.
3. The front trimming control method according to claim 1, wherein: in step S3, the electronic control module determines whether there is an intermediate stop according to the signal of the speed governor: when the speed regulator has reset action, the electric control module judges that intermediate stop exists; when the speed regulator has no reset action, the electronic control module judges that no intermediate stop exists.
4. The front trimming control method according to any one of claims 1 to 3, wherein: the speed regulator is a pedal of the sewing machine.
5. The front trimming control method according to claim 1, wherein: the calculation mode of the actual trimming time T is as follows: and T/(P N) -Tc, wherein L is the distance between the detection sensor and the thread cutting mechanism, P is the current needle pitch of the sewing machine, N is the current rotating speed of a main motor of the sewing machine when the sewing material passes through the detection sensor, and Tc is the response time of the detection sensor.
6. The front trimming control method according to claim 1 or 5, wherein: the detection sensor comprises a first sensor and a second sensor, and the first sensor, the second sensor and the thread cutting assembly are sequentially arranged from back to front along the direction of forward movement of the sewing material when the sewing machine sews.
7. The front trimming control method according to claim 6, wherein: one or only one of the first sensor and the second sensor is turned on.
8. The front trimming control method according to claim 6, wherein: the first sensor is installed on a sewing table of the sewing machine, and the second sensor is installed on a needle plate of the sewing machine.
9. The front trimming control method according to claim 1, wherein: the thread cutting time Tm is the time of the number of needles of 0-2 needles.
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