CN107099951B - Sewing machine and skip stitch detection device and detection method thereof - Google Patents
Sewing machine and skip stitch detection device and detection method thereof Download PDFInfo
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- CN107099951B CN107099951B CN201710379333.3A CN201710379333A CN107099951B CN 107099951 B CN107099951 B CN 107099951B CN 201710379333 A CN201710379333 A CN 201710379333A CN 107099951 B CN107099951 B CN 107099951B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/36—Devices for stopping drive when abnormal conditions occur, e.g. thread breakage
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/30—Details
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2205/00—Interface between the operator and the machine
- D05D2205/12—Machine to the operator; Alarms
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2305/00—Operations on the work before or after sewing
- D05D2305/32—Measuring
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Abstract
The invention discloses a skip stitch detection method for a sewing machine, which comprises the following steps: acquiring the time length occupied by the upper thread in the feeding process within a preset time period; judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not; if not, the next step is carried out; the operator is prompted for a sewing abnormality. The invention also discloses a skip stitch detection device for the sewing machine. The invention also discloses a sewing machine comprising the skip stitch detection device. The skip stitch detection method can timely know whether the skip stitch phenomenon occurs in the sewing process.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a skip stitch detection method for a sewing machine. The invention also relates to a skip stitch detection device for the sewing machine; in addition, the invention also relates to a sewing machine with the skip stitch detection device.
Background
As is well known, in a sewing machine, a phenomenon that a needle passes through a sewing material but a lower thread and an upper thread do not continuously form a stitch, which is called a skip stitch, sometimes occurs. In the sewing process, empty stitches can be left once the needles jump, the attractiveness of the stitches is affected, and particularly in the high-end sewing process of automobile products, leather and the like, the products must be treated as defective products once the needles jump.
In fact, most of airbag manufacturers in asia and the usa select polyamide thread sewing when producing airbags, due to the safety reasons of the airbags, the sewing process must be strictly controlled, the principle of zero defect is adhered to, any broken thread occurs, the product with empty needles is directly scrapped, and according to statistics, the phenomena of needle skipping and broken thread occur most in the sewing process. In order to take safety into consideration, the sewing machine must be capable of giving an alarm in time for the defects of needle skipping and thread breakage, so as to ensure zero defects of the safety airbag leaving a factory.
Disclosure of Invention
The invention aims to provide a skip stitch detection method for a sewing machine, which can know whether a skip stitch phenomenon occurs in the sewing process in time. Another object of the present invention is to provide a skip stitch detecting device for a sewing machine. Still another object of the present invention is to provide a sewing machine having the skip stitch detecting device.
In order to achieve the above object, the present invention provides a skip stitch detecting method for a sewing machine, comprising:
acquiring the time length occupied by the upper thread in the feeding process within a preset time period;
judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not; if not, the next step is carried out;
the operator is prompted for a sewing abnormality.
Preferably, the judgment is made to determine whether the ratio of the duration to the preset time period is within a preset duty ratio range; if not, the following steps are also included before:
acquiring the theoretical time length occupied by the upper thread in the feeding process during normal sewing;
calculating a theoretical duty ratio of the theoretical duration to the preset time period;
and determining the duty cycle range according to the theoretical duty cycle.
Preferably, the judgment is made to determine whether the ratio of the duration to the preset time period is within a preset duty ratio range; if not, the next step further comprises:
judging whether the duration is zero, if so, performing step S010; if not, go to step S02;
s010, performing disconnection prompt to an operator;
s02, judging whether the needle pitch is changed in the current preset time period; if not, performing step S020;
and S020, prompting jumper wire for an operator.
Preferably, in the step S02, if yes, the step S03 is further executed;
s03, compensating the duration according to the changed needle pitch, and judging whether the ratio of the compensated duration to the preset time period is within the duty ratio range; if not, the step S020 is executed.
Preferably, the preset time period is specifically the time required for one rotation of the spindle.
The present invention also provides a skip stitch detecting device for a sewing machine, comprising:
a piezoelectric sensor: the device is used for acquiring the time length occupied by the upper thread in the feeding process within the preset time period;
a controller: the duty ratio judging unit is used for judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not;
an alarm device: and when the ratio of the time length to the preset time period is not within the preset duty ratio range, the abnormal sewing is prompted to an operator.
Preferably, the alarm is a disconnection alarm for prompting disconnection of an operator when the duration is zero, and a jumper alarm for prompting jumper to the operator when the ratio of the duration to the preset time period is not within a preset duty ratio range and the duration is not zero.
Preferably, the method further comprises the following steps:
a memory: the method is used for acquiring the theoretical time length occupied by the upper thread in the feeding process during normal sewing;
duty ratio range determination unit: and the theoretical duty ratio is used for calculating the ratio of the theoretical duration to the preset time period, and the duty ratio range is determined according to the theoretical duty ratio.
Preferably, the piezoelectric sensor is arranged around the wire clamping stud.
The invention also provides a sewing machine comprising the skip stitch detection device.
Compared with the background technology, the invention provides a skip stitch detection method for a sewing machine, which mainly comprises the following steps: acquiring the time length occupied by the upper thread in the feeding process within a preset time period; judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not; if not, the abnormal sewing is prompted to the operator. According to the arrangement, whether the phenomenon of needle skipping or thread breakage occurs is known by judging the time length occupied by the upper thread in the feeding process in the preset time period, and when the ratio of the time length to the preset time period is not within the preset duty ratio range, abnormal sewing is prompted to an operator; therefore, the operator can know the abnormal phenomenon in the sewing process in time so as to take proper subsequent operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a skip stitch during sewing;
FIG. 2 is a schematic diagram showing the variation of thread feeding amount after the needle skipping phenomenon occurs;
FIG. 3 is a flow chart of a stitch skipping detection method for a sewing machine according to an embodiment of the present invention;
FIG. 4 is a flowchart of a skip stitch detection method for a sewing machine according to an embodiment of the present invention;
FIG. 5 is a block diagram of a stitch skipping detecting device for a sewing machine according to an embodiment of the present invention;
fig. 6 is a cross-sectional view of a wire holder equipped with a piezoelectric sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 6, fig. 1 is a schematic view of a skip stitch during sewing; FIG. 2 is a schematic diagram showing the variation of thread feeding amount after the needle skipping phenomenon occurs; FIG. 3 is a flow chart of a stitch skipping detection method for a sewing machine according to an embodiment of the present invention; FIG. 4 is a flowchart of a skip stitch detection method for a sewing machine according to an embodiment of the present invention; FIG. 5 is a block diagram of a stitch skipping detecting device for a sewing machine according to an embodiment of the present invention; fig. 6 is a cross-sectional view of a wire holder equipped with a piezoelectric sensor.
The invention provides a skip stitch detection method for a sewing machine, as shown in the accompanying drawing 3, which mainly comprises the following steps:
s100, acquiring the time length occupied by the upper thread in the feeding process within a preset time period;
s200, judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not; if not, the next step is carried out;
s300, prompting sewing abnormity to an operator.
Before describing the skip stitch detection method of the present invention, parameters such as thread consumption and thread feeding time of the sewing machine during normal operation can be studied, as shown in the accompanying drawings 1 and 2 of the specification.
As shown in the attached figure 1 of the specification, the thread quantity for normal sewing is as follows:
L＝P+2(h+c)
and the thread amount for generating the skip stitch: l ═ P
Wherein: p-thread consumption per stitch
h-thickness of upper layer cloth
c-hinge length of the face line;
from the above equation, the difference between the thread amount for normal sewing and the thread amount for stitch skipping is 2(δ + t), so if stitch skipping occurs during sewing, the thread feeding amount in the next spindle cycle after stitch skipping inevitably changes, and the specific change is shown in the delay of thread feeding time. The invention detects the skip stitch of the sewing machine by detecting the change.
It should be noted that the difference between the thread feeding process in which the upper thread feeding frame passes through the thread gripper and the thread feeding process in which the thread take-up and release operation of the thread take-up lever is not performed as to the stitch forming process is that the former is the input of the thread amount from the outside and the latter is the consumption of the internal thread amount. Therefore, the amount of thread feeding according to the present invention is mainly a change in the amount of externally input thread, and the consumption of the amount of thread internally appears as a change in the length of the slack portion, and is relatively difficult to detect, while a change in the amount of externally fed thread is relatively easy to realize. Because the sewing thread is input from the thread frame and needs to pass through the thread clamping device, the thread clamping device is not used as a dividing line, the thread passing from the thread clamping device to the machine needle is called an internal line, and the thread passing from the thread clamping device to the thread frame is called an external line, the sewing thread can be kept in a tensioning state due to the clamping effect of the thread clamping device, the internal line needs thread amount in the sewing process, the external line can be supplemented in time, the sewing machine which is stably operated is free of sewing starting, the thread amount consumption of the internal line is regular, the specific consumption is given by the formula, and therefore the supply of the external line to the thread amount is regular. If the skipping needle abnormity occurs, the thread consumption of the internal circuit changes, so that the external thread output quantity also changes correspondingly. In the sewing process, the thread transferring is not carried out in the whole period, but only carried out in a certain time period, the upper needle stop position of a machine needle is taken as the beginning of a main shaft period, namely, the change of the position of the machine needle corresponds to different working states, the time starting points of the thread transferring are different for different sewing machines, and the thread using amount is different for different needle pitches and fabrics.
When the sewing machine breaks, the sewing thread loses tension, the thread consumption is avoided, and the thread is not conveyed, so the invention can judge the broken thread condition.
As shown in FIG. 2, the delay delta of the line feeding time can be usedtThe reduction of the wire feeding amount is shown, and T is the time length of one rotation of the main shaft; the detection circuit compares the delay delta of the line feeding time of the front and back periods by monitoring the rising edge time of the leveltTo judge whether the jumping stitch occurs. Of course, the falling edge time of the level can be monitored, and the duration of the period occupied by the line sending time can be obtained.
In the invention, step S100, the time length of the upper thread in the feeding process in a preset time period is obtained; the length of time of the facial line in the feeding process can be known through a piezoelectric sensor, and the piezoelectric sensor can be arranged on the thread clamping device; as shown in figure 6 of the specification; the piezoelectric sensor 101 is sleeved on the thread clamping device stud 3, the thread clamping device stud 3 is arranged on the lower thread clamping plate 2, the sewing thread 1 (namely the upper thread) is wound on the piezoelectric sensor 101, the specific arrangement mode of the thread clamping device can refer to the prior art, and the piezoelectric sensor 101 is only additionally arranged for obtaining the time length occupied by the upper thread in the feeding process; in addition, the preset time period may be a time required for one rotation of the spindle.
In step S200, it is determined whether the ratio of the duration to the preset time period is within a preset duty ratio range; if not, the next step is carried out; as can be seen from the attached figure 2 in the specification, under the condition that the sewing is normal, the thread feeding time in one period T is T1Duty ratio of t1a/T; according to the duty ratio t1the/T can determine a preset duty cycle range; when a sewing abnormality (a skip phenomenon) occurs, a delay delta occurstAt this time, the time of sending the line in one period T is T2Actual duty cycle of t2a/T; when the actual duty ratio is t2If the/T does not belong to the preset duty ratio range, the process proceeds to step S300.
In step S300, the operator is presented with a sewing abnormality.
For the determination method of the preset duty ratio range, the following method can be adopted:
acquiring the theoretical time length occupied by the upper thread in the feeding process during normal sewing;
calculating a theoretical duty ratio of the theoretical duration to the preset time period;
and determining the duty cycle range according to the theoretical duty cycle.
Continuing with the description of the attached figure 2 as an example, the theoretical time length occupied by the upper thread in the feeding process in normal sewing is t1(ii) a Calculating the theoretical duty ratio t of the ratio of the theoretical duration to the preset time period1a/T; and the theoretical duty cycle t1T is a defined value; according to actual conditions, the theoretical duty ratio t1the/T is determined as a rangeI.e. the duty ratio range, and whether the actual duty ratio in the actual sewing process is within the duty ratio range is judged by taking the duty ratio range as a judgment reference.
In case the actual duty cycle is not within the duty cycle range, the following steps may also be performed:
judging whether the duration is zero, if so, performing step S010; if not, go to step S02;
s010, performing disconnection prompt to an operator;
s02, judging whether the needle pitch is changed in the current preset time period; if not, performing step S020;
and S020, prompting jumper wire for an operator.
That is, as long as the time length is zero, it indicates that the upper thread is already disconnected, and therefore the actual duty ratio should also be zero, and step S010 is performed to prompt the operator to disconnect the thread; if the duration is not zero, it indicates that the thread is not broken, and step S02 is performed to determine whether the needle pitch is changed within the preset time period; if not, performing step S020; and prompting the operator for jumping.
In the step S02, if the needle pitch is changed within the current preset time period, the step S03 is further executed; compensating the duration according to the changed needle pitch, and judging whether the ratio of the compensated duration to the preset time period is within the duty ratio range; if not, the step S020 is executed.
The program flow chart is shown in figure 4 in the specification;
after the step S10 is started, step S20 is executed to obtain a sensor waveform, that is, to obtain a waveform that the piezoelectric sensor starts to work, and obtain the waveform as shown in fig. 2 in the specification; filtering and shaping in step S30, filtering and shaping the obtained actual waveform, which may refer to the prior art; calculating the duty ratio in step S40, and judging whether the duty ratio is smaller in step S50; step S40 and step S50 are the above step S200, and determine whether the ratio of the duration to the preset time period is within the preset duty ratio range; if the duty ratio is not within the preset duty ratio range, that is, the duty ratio is smaller, the process proceeds to step S60, where it is determined whether the duty ratio is zero (if the duration is zero), and if so, a disconnection warning signal is output and the process ends, such as steps S70 and S80. If the actual duty ratio is within the preset duty ratio range, the sewing period is defined as a normal period and stored, and the next cycle of detection is entered, as shown in step S51.
In step S60, if the actual duty ratio is not zero, step S61 is performed to determine whether the stitch length is changed, and if the stitch length is not changed, it is determined that the skip phenomenon does occur, and a skip alarm signal is output and ended, as in steps S71 and S90; in step S61, if the needle pitch is changed, the compensation value of the changed needle pitch is added to the calculation process of the duty ratio (the specific compensation mode may be determined according to actual needs), and it is determined whether the calculated duty ratio is still small after compensation, if so, a needle skipping alarm signal is output and the process is ended, such as step S62, step S72 and step S90; and if the calculated duty ratio after compensation is within the preset duty ratio range, returning to the step S20, and repeating the loop judgment.
Therefore, the piezoelectric sensor 101 can be installed on the wire clamping stud 3, when the piezoelectric sensor 101 detects that the tension is increased, a waveform signal is output, the waveform signal is processed into a square wave signal in the figure 2, and the rising edge time (the falling edge time in the opposite case) of the waveform of each period is compared, so that whether the needle skipping occurs or not can be judged. In the stable sewing process, the thread feeding process is relatively stable under the condition of not changing sewing parameters, but if the system fluctuates accidentally or the sewing machine is just in variable-pitch sewing, the thread feeding process is also changed, and at the moment, misjudgment can be caused with great possibility.
The invention relates to a detection method by comparing waveform duty ratios. As shown in figure 2, the thread-transferring state is represented by the high level of the waveform, the waveform of the normal sewing condition is arranged above the figure, the waveform after the needle skipping occurs is arranged below the figure, and the duty ratio of the normal waveform is t1T, the duty cycle of the waveform of the period after the stitch skipping is T2The period T of the waveform can be calculated through the rotation speed of the main shaft electric control as long as the detection is carried outAnd the high level time t of each spindle period is measured, and whether the jumping stitch occurs can be judged by comparison. Even in the case of variable-pitch sewing, it is still applicable if the variable-pitch portion is compensated accordingly. The duty ratio refers to a time ratio of the high level in one period to the whole period. Of course, the waveform does not have to be a rising edge timing, but may be a falling edge timing, and may be determined as necessary.
The invention also provides a skip stitch detection device for a sewing machine, as shown in the attached figure 5 of the specification, mainly comprising:
the piezoelectric sensor 101: the device is used for acquiring the time length occupied by the upper thread in the feeding process within the preset time period;
the controller 102: the duty ratio judging unit is used for judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not;
the alarm 103: and when the ratio of the time length to the preset time period is not within the preset duty ratio range, the abnormal sewing is prompted to an operator.
Preferably, the alarm is a disconnection alarm for prompting disconnection of an operator when the duration is zero or not, and a jumper alarm for prompting jumper to the operator when the ratio of the duration to the preset time period is not within a preset duty ratio range and the duration is not zero.
Preferably, the method further comprises the following steps:
a memory: the method is used for acquiring the theoretical time length occupied by the upper thread in the feeding process during normal sewing;
duty ratio range determination unit: and the theoretical duty ratio is used for calculating the ratio of the theoretical duration to the preset time period, and the duty ratio range is determined according to the theoretical duty ratio.
Preferably, the piezoelectric sensor 101 is disposed around the chuck stud 3. The piezoelectric sensor 101 mounting location may also be provided at a small wire grip stud or other wire passing member.
The skipping stitch detection device has the advantages that the original mechanism of the sewing machine is changed a little, only the piezoelectric sensor 101 needs to be additionally arranged on the thread clamping device or other thread passing pieces, the influence on the thread passing way is little, and the attractiveness of the existing sewing stitch can not be influenced. Meanwhile, the thread conveying state of the sewing machine is represented through the tension level, and the data collected by the piezoelectric sensor 101 is converted into switching values in a high-low level mode, so that the precision requirement of the adopted sensor can be reduced, and the cost can be controlled. The duty ratio detection mode is adopted, so that the identification accuracy can be improved, and the method is still suitable for variable-stitch-length sewing; the skipping-stitch detection device can also distinguish and detect skipping stitches and broken threads.
The invention provides a sewing machine with a skip stitch detection device, which comprises the skip stitch detection device described in the specific embodiment; other parts of the sewing machine can be referred to the prior art and are not expanded herein.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The sewing machine and the skip stitch detection device and the detection method thereof provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A skip stitch detection method for a sewing machine, characterized by comprising:
acquiring the time length occupied by the upper thread in the feeding process within a preset time period;
judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not; if not, the next step is carried out;
when the duration is zero, performing disconnection prompt on an operator;
and when the duration is not zero and the needle pitch is judged not to be changed in the current preset time period, carrying out jumper wire prompt on an operator.
2. The method according to claim 1, wherein the determining whether the ratio of the duration to the preset time period is within a preset duty cycle range; if not, the following steps are also included before:
acquiring the theoretical time length occupied by the upper thread in the feeding process during normal sewing;
calculating a theoretical duty ratio of the theoretical duration to the preset time period;
and determining the duty cycle range according to the theoretical duty cycle.
3. The skip stitch detection method according to claim 1, wherein when it is determined that the stitch length is changed within the preset time period, step S03 is further executed;
s03, compensating the duration according to the changed needle pitch, and judging whether the ratio of the compensated duration to the preset time period is within the duty ratio range; and if not, executing the step of prompting the jumper wire to the operator.
4. The method for detecting the skip needle according to any one of claims 1 to 3, wherein the preset time period is specifically a time required for one rotation of the main shaft.
5. A skip stitch detection device for a sewing machine, comprising:
a piezoelectric sensor: the device is used for acquiring the time length occupied by the upper thread in the feeding process within the preset time period;
a controller: the duty ratio judging unit is used for judging whether the ratio of the duration to the preset time period is within a preset duty ratio range or not;
an alarm device: the sewing machine is used for prompting sewing abnormity to an operator when the ratio of the time length to the preset time period is not within a preset duty ratio range;
the alarm is specifically a disconnection alarm for prompting disconnection of an operator when the duration is zero or not, and a jumper alarm for prompting jumper to the operator when the ratio of the duration to the preset time period is not within a preset duty ratio range and the duration is not zero.
6. The pogo pin detection device of claim 5, further comprising:
a memory: the method is used for acquiring the theoretical time length occupied by the upper thread in the feeding process during normal sewing;
duty ratio range determination unit: and the theoretical duty ratio is used for calculating the ratio of the theoretical duration to the preset time period, and the duty ratio range is determined according to the theoretical duty ratio.
7. The jumper pin detection device according to claim 5 or 6, wherein the piezoelectric sensor is arranged around the wire clamp stud.
8. A sewing machine characterized by comprising the skip stitch detecting device according to any one of claims 5 to 7.
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| JP7183824B2 (en) * | 2019-01-29 | 2022-12-06 | ブラザー工業株式会社 | sewing machine |
| CN110359191A (en) * | 2019-07-22 | 2019-10-22 | 杰克缝纫机股份有限公司 | A kind of baseline based on error compensation uses length calculation method |
| CN110453400B (en) * | 2019-08-16 | 2021-07-27 | 北京大豪科技股份有限公司 | Embroidery machine thread state detection method and device, electronic device and storage medium |
| CN114318686A (en) * | 2020-09-28 | 2022-04-12 | 杰克科技股份有限公司 | Sewing machine control parameter automatic adjustment method, device and readable storage medium |
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