TW201643290A - Compensation method of fabric feeding amount for sewing machine - Google Patents

Abstract

A compensation method of fabric feeding amount for sewing machine, applied to a sewing machine, comprises the following steps: (A) a compensation unit constructs at least one standard pattern sample; (B) the sewing machine sews a test pattern sample on a material according to the standard pattern sample; (C) the compensation unit photographs and scans the test pattern sample into a test image, which is image-processed and compared with the standard pattern sample; (D) the compensation unit calculates the lengths of the standard and test pattern samples respectively, whereby the length values mentioned above are converted into the compensation values required by the driving unit operation of the sewing machine; (E) the compensation unit inputs the compensation values into the control unit of the sewing machine, and the control unit superimposes the compensation values to the corresponding feeding parameters in the parameter database as the rotation setting of the next driving unit operation.

Description

Compensation method for feed feed amount of sewing machine

The present invention relates to an automatic compensation method, and more particularly to a compensation method for feeding feed amount of a sewing machine.

The compensation method of the existing sewing machine is mostly to build the sensor inside the machine and measure the error of the actuating component to make compensation. It is often necessary to build relevant sensing parts and lines on the actuating component of the machine, and one influence The arrangement of the original components, the second must take into account the coordination between the components and the accuracy of the control, so that the compensation method is more complicated. On the other hand, there are few corrections for the actual sewing, which is limited to the machine itself, and it is difficult to confirm the accuracy of the actual sewing.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of compensating for a feed amount of a sewing machine which is simpler, lower in cost, and which can improve the accuracy of feeding feed.

Thus, the method of compensating for the feeding amount of the sewing machine of the present invention is applied to a sewing machine. The sewing machine comprises a sewing unit for suture, a driving unit, a feeding unit driven by the driving unit for feeding, and a control unit electrically connecting the driving unit and a compensation unit, the feeding unit The unit cooperates with the sewing unit for sewing, and the control unit constructs a parameter database for controlling the actuation of the driving unit, and the parameter database has a plurality of pen feeding parameters.

The compensation method of the feeding feed amount of the sewing machine comprises the following steps:

(A) The compensation unit establishes at least one standard pattern.

(B) The driving unit of the sewing machine drives the feeding unit to drive a material, and cooperates with the sewing unit to sew a test pattern according to the standard pattern.

(C) The compensation unit captures and scans the test pattern into a test surface, and the image processes the test surface and compares it with the standard pattern.

(D) The compensation unit respectively calculates and calculates the length of the standard pattern and the test pattern, and then converts at least one compensation value required for the driving unit to operate according to the length value.

(E) The compensation unit merges the compensation values into the control unit, and the control unit superimposes the compensation value to the corresponding feed parameter in the parameter database as the rotation setting of the next operation of the driving unit.

The utility model has the advantages that the precision of the feed feeding amount is improved by the compensation unit, and a plurality of sensing members are avoided, and the connection with the original components of the sewing machine is not complicated, and the utility model can be used simply and at low cost. The compensation method of the present invention.

20‧‧‧Sewing machine

21‧‧‧ stitching unit

22‧‧‧Drive unit

23‧‧‧Feeding unit

24‧‧‧Control unit

241‧‧‧Parameter database

3‧‧‧Compensation unit

31‧‧‧Memory Module

32‧‧‧Video Recorder

33‧‧‧Image Processing Module

34‧‧‧ Computing Module

41‧‧‧Standard drawing

411‧‧‧Standard pattern

42‧‧‧Test surface

421‧‧‧ test pattern

5‧‧‧Materials

61~65‧‧‧Steps

Other features and effects of the present invention will be apparent from the embodiments of the drawings, in which: BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing an embodiment of a method for compensating a feed feed amount of a sewing machine according to the present invention, illustrating a connection actuation relationship between components; and Fig. 2 is a schematic view showing a compensation unit for a standard drawing. Aligning with a test surface; and Figure 3 is a flow chart of an embodiment.

Referring to Figs. 1 to 3, an embodiment of a method of compensating for the feeding amount of the sewing machine of the present invention is applied to a sewing machine 20.

The sewing machine 20 includes a sewing unit 21 for suture, a driving unit 22, a feeding unit 23 driven by the driving unit 22 for feeding, and a control unit electrically connecting the driving unit 22 and a compensation unit 3. twenty four.

The feeding unit 23 pushes a material 5 at a different unit feed amount, and can cooperate with the sewing unit 21 to synchronize the lower needle to sew a plurality of patterns on the material 5. The control unit 24 defines a parameter database 241 for operating the driving unit 22, and the parameter database 241 has a plurality of feed parameters corresponding to the unit feed amount.

The compensation unit 3 includes a memory module 31, a video recorder 32, an image processing module 33, and an operation of respectively reading the memory module 31 and the image processing module 33 and electrically connecting the control unit 24 Module 34.

The method for compensating the feed feed amount of the sewing machine includes the following steps: in step 61, the compensation unit 3 respectively constructs a plurality of standard patterns 411 according to different unit feed amounts and stores them in the memory module 31. The standard patterns 411 are combined to form a standard surface 41.

In the step 62, the driving unit 22 of the sewing machine 20 drives the feeding unit 23 to drive the material 5, and cooperates with the sewing unit 21 to sew a plurality of test patterns 421 on the material 5 according to the standard drawing surface 41.

It is further explained that each standard pattern 411 in the standard drawing surface 41 is a line in which line segments of the same unit feed amount are combined in series, and the length is a standard length value, and each test pattern 421 corresponds to the same unit. The amount is stitched along a feeding direction. When the suturing operation is performed, the suturing unit 21 and the feeding unit 23 perform a movement once, and suture a unit feeding amount of the length of the material 5. It can be noted that in the present embodiment, a plurality of test patterns 421 are stitched to the material 5 at a time, which can speed up the work. Of course, only one test pattern 421 can be sewn at a time for only a specific unit feed amount.

In step 63, the camcorder 32 of the compensation unit 3 captures and scans the test pattern 421 into a test surface 42, and the image processing module 33 performs image processing on the test surface 42 and the standard map. Face 41 is aligned. In this embodiment, the picture is analyzed in a two-dimensional manner, and the standard pattern 411 and the specific points on the test pattern 421 are respectively taken and the distance between the points and the points is converted as the length basis, and the position of the point is determined by sewing. At the time of the lower needle.

In step 64, the computing module 34 measures and calculates the lengths of the standard patterns 411 and the test patterns 421, and respectively substitutes the compensation mathematical formulas, and converts the plurality of driving units 22 to operate. The required compensation value. Usually check according to the value of the unit feed The sorting of the workflow can be set to sort from the minimum value to the maximum value, and the standard pattern 411 of the same unit feed amount and the length of the test pattern 421 are compared each time, and the operation is performed.

In the present embodiment, the length of the standard pattern 411 is preset to a standard length value of 30 mm. Therefore, when the same length is actually sewn, the number of seams is reduced as the value of the unit feed amount is increased. For example, if the feed per unit is 0.5 mm, the number of seams is 60. If the feed per unit is 1 mm, the number of seams is 30.

For example, the first operation method is: capturing a plurality of specific points through the image processing module 33, where the specific points are lower needle points, and the operation module 34 calculates corresponding points corresponding to the specific points. The distance value is used to estimate the value of each point of the test pattern 421. Lagrange Interpolating polynomial may be used, and three down points are taken for the test pattern 421, and the corresponding values are measured. Separately , , , substituting into the Lagrangian planting polynomial to calculate the value at any point x _i for:

Among them, i represents the number of stitches, usually the number of stitches (if no stitches are stitched out when the first stitch is down, it is convenient for calculation, it is regarded as i=0), and x _i represents the point of the ith needle down. The value indicating the test pattern 421 at the point x _i , similarly, y _i represents the value of the standard pattern 411 at the point x _i , and also represents the ideal value at the point x _i , since the value is built in the memory The module 31 can be automatically read and determined by the system and can be regarded as a known application. The added benefit of this formula is that the known value can be used to calculate the unit feed of the next stitch during actual sewing, and then the feedback calculation of the compensation value can be used with the following formula, which is suitable for immediate feedback control.

If (x ₀ , y ₀ ) is the starting point (0, 0), the above equation can be simplified to:

Calculated using the above formula The value, the compensation formula can be obtained as: Where δ is the conversion factor, depending on the built-in parameters of the machine, and It is the amount of error generated when the needle is down for the ith time, and further the compensation value b _i required for the i-th lower needle of the drive unit 22 is converted. Because each time the needle is finished, the unit feed of the next needle can be estimated, which is more precise and fine-tuned for the instant feedback control.

There are many ways to calculate the compensation value, and the second calculation method is relatively simple. Assuming that the test pattern 421 is a linear straight line and the unit feed amount of the lower needle is evenly distributed, only the point values of the front and rear ends of the test pattern 421 are used for the length calculation, and the compensation value can be obtained by a relatively simple formula.

The length of the standard pattern 411 is set to a standard length value L ₀ , and the length of the test pattern 421 calculated by the operation module 34 to calculate the same unit feed amount a is one amount. The length value L _{1 is} measured. Substituting the above known parameters into the following equation is used for the operation.

Where b is the compensation value required by the driving unit 22, and the corresponding conversion coefficient is known as The unit feed amount is a, and then the standard length value L _{0 is} substituted, and the measured length value L ₁ calculated by the measurement is further calculated: the total error amount is (L _{0 -} L ₁ ), and the number of seams Is (L ₀ /a). The total error amount of the length divided by the number of seams is the average error value, indicating the length error that should be made up each time the stitch is stitched, and then multiplied The compensation value b required for the drive unit 22 is converted.

At step 65, the compensation module 34 is fed to the control unit 24 by the computing module 34. The control unit 24 sequentially superimposes the received compensation values on the corresponding feed parameters in the parameter database 241 as the rotation setting of the next operation of the driving unit 22, thereby adjusting the feeding of the feeding unit 23. the amount.

The parameter database 241 basically classifies and builds the value of the rotation setting according to the unit feed amount, and further, can also sort according to the number of seams, and one-to-one correspondingly sets the value of the rotation setting of each seam number. . Further, the parameter database 241 can also be classified according to the type of material.

The aforementioned material 5 may be a soft cloth, a hard cloth, a non-woven fabric, a leather, a plastic, or other substrate for sewing. The advantage of using different materials 5 for the present invention is that some of the more sophisticated sewing machines 20 have a choice of material settings. Depending on the material 5, such as the difference in friction between the cloth or the leather, the feed speed may vary, and each type may be used. The material 5 is compensated by the compensation method of the present invention for the feed amount corresponding to the different materials 5, and is correspondingly stored under the category of each material type.

The two methods mentioned in step 64 can be used to calculate the compensation value, and the second operation method is different from the first operation method in that the total error amount is directly calculated, and the total error amount is equally divided for each. One feed And when the needle is down, make compensation. The accuracy may not be as precise as the first calculation method until each needle is corrected, but overall, the compensation effect gradually corrects the overall error amount as the number of seams increases, and more preferably, the control unit 24 It is not necessary to make a differential correction for each seam, and the driving unit 22 can be controlled relatively easily. Correspondingly, the second operation method has the advantages of being suitable for immediate feedback control and obtaining higher precision.

The present compensation method is used to test a sewing machine, using the same material, such as a hard cloth, applying the compensation method of the present invention, and respectively testing the two modes of forward feeding and backward feeding. The test method is to control the sewing machine according to different unit feeds (take six unit feeds: 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm) to sew several lengths according to the standard pattern. The test patterns of the same standard length value (30mm) are respectively fed and sewn in the forward direction and the backward direction along the feeding direction, and the measured length values before the uncompensated test pattern are actually recorded, and Compensate the corrected measurement length value.

For test results, please refer to Table 1 and Table 2, where the unmarked units are in millimeters (mm). Comparing the error rate before and after compensation, the improvement of the error rate can be clearly seen, indicating that the compensation method can effectively improve the accuracy of the feed feed amount.

It should be noted that the compensation method of the present invention does not limit whether the compensation unit 3 is disposed on the sewing machine 20, and can be configured according to the purpose of use.

The compensating unit 3 can be disposed on the sewing machine 20, and the camcorder 32 is mounted above the feeding unit 23 to instantly capture the test pattern 421 that has just been stitched, and can immediately return the data to continue image analysis and In comparison, the unit feed amount of the feed unit 23 is corrected, and an immediate correction is achieved. The advantage of this method is that the sewing machine 20 itself has feedback control of the feed amount, and each time it is used, it is immediately monitored, and if there is an error, it can be corrected as soon as possible.

The compensation unit 3 can also be additionally constructed and connected to the control unit 24 by a signal line (not shown). After the stitched test pattern 421 is photographed by the camcorder 32, the comparison analysis is performed, and the signal of the processing operation is transmitted to the control unit 24 through the signal line, and the unit feed amount of the feeding unit 23 can also be adjusted. The effect. The advantage of this method is that the sewing machine 20 does not need to be equipped with new components, and the cost is relatively low. Generally, when the sewing machine 20 is adjusted at the factory, the accuracy of the feed amount can be effectively improved, which helps to simplify the calibration of the factory shipment. Or inspection procedures can speed up working hours and reduce costs.

From the above description, it is understood that the advantages and effects of the compensation method of the feed feed amount of the sewing machine of the present invention are as follows:

1. The application of the compensation unit 3 of the present invention can easily adjust the feed amount of the feed unit, and does not need to additionally install a sensor in the part, thereby reducing the cost.

2. The present invention does not limit the model of the applied product, and almost all of the sewing machine 20 products can be applied, because the present invention analyzes the material 5 by image processing, and does not need to be additionally used in the previously designed sewing machine 20. Adding new components also compensates for unit feeds. More conveniently, the finished product on the material 5 can be directly inspected for verification.

3. The present invention is applied to the sewing machine 20, and the manufacturing factory can use the present invention to inspect the sewing machine 20 that has just been shipped from the factory, instead of the original complicated correction procedure, and the memory module 31 of the compensation unit 3 can be constructed in a large amount. The standard pattern 411 for comparison allows the factory to select the calibration option as required, thereby enabling the introduction of a better quality product.

Fourth, it can also benefit from the development end and the user end of the sewing device. The present invention provides a new application mode, and the convenient feed amount correction compensation method is advantageous for simplifying the design of the research and development end, and is also beneficial for the pursuit of perfect use. The user can easily adjust the unit feed rate without the need to regularly enter the factory for maintenance correction.

5. The invention can be installed on the sewing machine 20 according to the purpose of use, and the application adaptability is wide; the design of precision and complexity can also be adjusted by the operation module 34 of the compensation unit 3, and the use is flexible. High degree.

In summary, the present invention uses the test pattern sewn on the material and the built-in standard pattern to perform the comparison operation, thereby obtaining the compensation value, thereby adjusting the precision of the feed feed amount, and the method is simple and low in cost, so it is true. The object of the invention can be achieved.

However, the above is only the preferred embodiment of the present invention. The simple equivalent changes and modifications made in the scope of the invention and the scope of the patent specification are still within the scope of the invention.

20‧‧‧Sewing machine

21‧‧‧ stitching unit

22‧‧‧Drive unit

23‧‧‧Feeding unit

24‧‧‧Control unit

241‧‧‧Parameter database

3‧‧‧Compensation unit

31‧‧‧Memory Module

32‧‧‧Video Recorder

33‧‧‧Image Processing Module

34‧‧‧ Computing Module

5‧‧‧Materials

Claims (8)

A method for compensating a feed feed amount of a sewing machine is applied to a sewing machine comprising a stitching unit for stitching, a driving unit, a feeding unit driven by the driving unit for feeding, and an electrical connection The driving unit and the control unit of the compensation unit, the feeding unit cooperates with the sewing unit for sewing, and the control unit constructs a parameter database for controlling the actuation of the driving unit, and the parameter database has a plurality of feeding parameters The method for compensating the feed feed amount of the sewing machine comprises the following steps: (A) the compensation unit constructs at least one standard pattern; (B) the drive unit of the sewing machine drives the feed unit to drive a material, and cooperates with the stitching The unit sews a test pattern according to the standard pattern; (C) the compensation unit captures and scans the test pattern into a test surface, and the image processes the test surface and compares with the standard pattern; (D) the compensation unit respectively Calculating the length of the standard pattern and the test pattern, and then converting at least one compensation required for the driving unit to operate according to the length value ; And (E) the compensation value compensation unit, etc. The control unit of the import, the control unit superimposes the compensation value to the parameter database corresponding to the feed parameters, as the next rotation of the driving operation of the setting unit. a method for compensating a feed feed amount of the sewing machine according to claim 1, The feeding unit feeds the material in different unit feeding amounts, and can cooperate with the sewing unit to sew a plurality of patterns and cooperate with the sewing unit to sew a plurality of patterns, and the feeding parameters in the parameter database respectively correspond to units. Feed quantity setting, wherein (A) the compensation unit respectively constructs a plurality of the standard patterns according to different unit feed amounts, and the standard pattern combinations form a standard drawing surface; (B) the feeding unit and the stitching unit are in accordance with the The standard drawing sews a plurality of the test patterns on the material; (C) the compensation unit captures and scans the test patterns into the test surface, and the image processes the test surface and compares with the standard drawing surface (D) the compensation unit separately calculates and calculates the lengths of the standard patterns and the test patterns, and then converts the compensation values required for the operation of the driving units according to the length values, and these The compensation value is transferred to the control unit; and (E) the compensation unit sends the compensation value to the control unit, and the control unit superimposes the compensation value to the corresponding feed parameter in the parameter database, as the next time drive Turning the setting operation unit. A method of compensating for a feed feed amount of a sewing machine according to claim 2, wherein the compensation unit includes a video recorder for photographing the material. A method of compensating for the feeding amount of the sewing machine according to claim 3, The compensation unit further includes a memory module, an image processing module for image processing the test surface, and an operation of respectively reading the memory module and the image processing module and electrically connecting the control unit Module. A method for compensating a feed feed amount of a sewing machine according to claim 2, wherein each standard pattern is a line in which line segments of the same unit feed amount are combined in series, and the length is a standard length value, and each test The pattern is stitched together in the same feeding direction by using the same unit feed amount, and the test pattern image is processed and converted to obtain the measured length value of each length, and the operation module is further substituted into the above standard length by a compensation mathematical formula. After the value and the measured length value, the compensation value is converted. A method for compensating a feed feed amount of a sewing machine according to claim 5, wherein the compensation mathematical expression is: b is the compensation value, The conversion coefficient, a is the unit feed amount, L ₀ is the standard length value, and L ₁ is the measurement length value. A method for compensating a feed feed amount of a sewing machine according to claim 5, wherein the compensation mathematical expression is: b is the compensation value, δ is the conversion coefficient, y is the standard length value, To measure the length value. A method of compensating for the feeding amount of the sewing machine according to claim 1, The material is one of cloth, leather and plastic.