TW202007808A - A method for calculating the length of a remaining bobbin thread, and device using same - Google Patents

Abstract

The present invention relates a method for calculating remaining bobbin thread which can apply to automatic sewing machine and a device that used the method. The method is getting a smallest remaining length of bobbin thread, a total length of bobbin thread, a next sewing length for sewing preset pattern and a used length of present bobbin thread for generating a first determining value and a second determining value; according to measuring whether the first determining value is bigger than the second determining value for generating a reminding message or updating the used length of present bobbin thread, to apply next sewing operation. When a user uses the automatic sewing machine, the user can know when need to change a bobbin case without assembling sensor in a sewing machine.

Description

Method and device for calculating remaining length of bottom line

A method and device for calculating the remaining length of a bobbin thread, in particular to an automatic sewing machine device that can be used to automatically change the bobbin.

Just like the CNC processing machines used in the industrial field, in the field of sewing machines, sewing machines that can automatically sew according to the graphic trajectory set by the user. Needle stop or thread trimming have been developed. In such sewing machines, how to prevent The bobbin thread used in the process of automatic sewing is exhausted, causing scrapped products or requiring time-consuming repair, which is a problem that must be solved.

In order to solve the above problems, the methods currently used in the automatic sewing machines on the market include the method of calculating the amount of bobbin thread using the number of sewing needles, and the use of a sensor installed on the sewing machine to monitor the number of turns of the coil or detect the coil Thickness to determine the bottom line margin.

However, the method of calculating the amount of bobbin thread using only the number of stitches must ensure that the stitch length of each stitch and the thickness of the sewing material must be the same, otherwise errors will occur in the calculation; and the method of using the sensor to monitor the coil, In addition to the sensor that must be installed on the sewing machine table, special parts for the sensor must be specially made, which increases the cost of the equipment.

The main purpose of the present invention is to provide a method for calculating the remaining length of the bobbin thread, which allows the user to know when the bobbin needs to be replaced when applying an automated sewing machine, and does not need to install an additional sensor on the original sewing machine.

The second object of the present invention is to provide a method for calculating the remaining length of the bottom line, which can be selected by the remaining amount of the bottom line or the length of the already used bottom line for calculation.

The secondary object of the present invention is to provide a device capable of calculating the remaining length of the bobbin thread, which allows the user to know when the bobbin needs to be replaced when using an automated sewing machine.

To achieve the above objective, a method for calculating the remaining length of the bottom line of the present invention includes: an obtaining step, a judgment value generating step, and a judgment reminding step.

In the above obtaining step, a minimum remaining length, a total length of the bobbin thread, a length of the current state in which sewing has been performed, and a next sewing length required for sewing a preset pattern are obtained.

Then, in the determination value generation step, a first determination value and a second determination value are generated based on the minimum remaining length, the next sewing length and the current state length.

Finally, in the judgment reminding step, the first judgment value and the second judgment value are compared. When the first judgment value is greater than the second judgment value, a reminder message is generated to let the user know that the remaining amount of the bottom line is insufficient, or stop The sewing machine operates; and when the first judgment value is less than the second judgment value, the value of the current state length is updated for the next sewing period.

Regarding the actual judgment method, in one embodiment, the length of the currently used bobbin thread plus the expected bobbin thread length is greater than the length of the entire bobbin thread that can be used for the next section of sewing. A judgment value is generated by adding the current sewing length to the next sewing length; the second judgment value is generated by subtracting the minimum remaining length from the total length of the bobbin thread.

In another embodiment, by judging whether the length of the currently unused bobbin thread is used to sew the length of the bobbin thread that is expected to be used, whether the minimum remaining length will be used, so the above first judgment value is directly Generated by the minimum remaining length; the second judgment value is generated by subtracting the next sewing length from the current state length.

Regarding the method for obtaining the next sewing length, in one embodiment, the calculation of the next sewing length is generated by calculating the stitch length of the preset pattern and the setting value of the intermediate presser height when sewing the preset pattern; Wherein, the setting value of the height of the intermediate presser foot is a distance between a lowest point of a reciprocating stroke of an intermediate presser foot corresponding to the sewing machine and a needle plate surface of the sewing machine.

In order to calculate the above sewing length more accurately, in one embodiment, the calculation of the next sewing length further includes a thread length generated by the thread cutting operation before starting a sewing path and after ending the sewing path.

In one embodiment, the preset pattern includes at least one stitch portion, and the calculation formula for the next sewing length is: Lseam = Σ Ls + H + Bwaste, where Lseam is equal to the next sewing length; Ls is equal to the stitch size The length of bobbin thread required by the part; H is equal to the above-mentioned intermediate presser height setting value; Bwaste is equal to the above-mentioned thread length.

In another embodiment, the predetermined pattern includes at least one stitch portion and optionally a moving portion, so that the calculation formula of the next sewing length is: Lseam = Σ Ls + Σ Lm + H + Bwaste Among them, Lseam is equal to the above-mentioned next sewing length; Ls is equal to the length of the bobbin thread required for the stitch portion; Lm is equal to the bobbin thread length required for the moving portion; H is equal to the setting value of the intermediate presser foot height; Bwaste is equal to the length of the thread end.

In addition, in order to accurately estimate the length of the actual consumed bottom thread, in one embodiment, when calculating the next sewing length, the calculation process of the next sewing length further includes a correction factor.

In one embodiment, considering that the thickness of the material used in sewing will vary according to requirements, the preset pattern may include at least two different settings of the intermediate presser foot height.

The present invention also provides a device capable of calculating the remaining length of the bobbin thread. The above device uses the aforementioned method for calculating the remaining length of the bobbin thread, including: a sewing machine that can automatically perform sewing operations according to settings, at least one input device, a memory module, A judgment module and an output device.

The input device is connected to the sewing machine to input the minimum remaining length, the total length of the bobbin thread and a sewing parameter required for generating the next sewing length; the memory module is connected to the sewing machine to record the current state length.

The calculation module is connected to the input device and the memory module, calculates the next sewing length after acquiring the sewing parameters, and obtains the minimum remaining length, the total length of the bobbin thread, the next sewing length and the current After the length of the state, the first judgment value and the second judgment value are generated; and the judgment module is connected to the calculation module and the memory module for generating a value through the first judgment value and the second judgment value The reminder message updates the value of the current state length and sends it to the memory module; the output device is used to display or generate a reminder signal after receiving the reminder message.

Finally, the present invention also provides another device capable of calculating the remaining length of the bobbin thread, used in conjunction with a sewing machine that can sew according to a set path, and the above device uses the aforementioned method for calculating the remaining length of the bobbin thread, including: at least one input Device, a memory module, a calculation module and a judgment module.

The input device is used for inputting the minimum remaining length, the total length of the bobbin thread, and the sewing parameters required for generating the next sewing length; the memory module is used for recording the current state length.

The calculation module is connected to the input device and the memory module, calculates the next sewing length after acquiring the sewing parameters, and obtains the minimum remaining length, the total length of the bobbin thread, the next sewing length and the current state After the length, the first judgment value and the second judgment value are generated; and the judgment module is connected to the calculation module and the memory module to generate a reminder through the first judgment value and the second judgment value The message may update the value of the current state length and send it to the memory module.

As can be seen from the above description, the present invention is characterized by providing a method for calculating the remaining length of the bobbin thread and a device using the method, or a device using the method in conjunction with a sewing machine, through the minimum remaining length of the bobbin thread and the total length of the bobbin thread Degree, the current length of the bobbin thread, and the calculation of the stitches, stitches, intermediate presser height settings, remaining length, and correction factors required for the nature of the thread or material to be automatically sewn to the pattern Sewing length to generate the first judgment value and the second judgment value, and according to whether the first judgment value is greater than the second judgment value to judge whether the remaining amount of bobbin thread can be used to finish the next sewing length, and send a signal or reminder The user can let the automatic sewing machine know when the bobbin needs to be replaced, and there is no need to install a sensor on the sewing machine to detect the remaining amount of bobbin thread.

In order to facilitate a deeper and more clear and detailed understanding and understanding of the structure, use and characteristics of the present invention, the preferred embodiment is cited, and the detailed description in conjunction with the drawings is as follows:

Referring to FIGS. 1 to 2, the method for calculating the remaining length of the bobbin thread provided by the present invention, in one embodiment, is through a sewing machine 10 and a connection (or (Built) executed by the computing device 20 of the sewing machine 10 described above.

First, regarding the part of the above-mentioned sewing machine 10, the present invention does not specifically limit the above-mentioned sewing machine 10, but can be applied to various types of sewing machines; the part of the above-mentioned computing device 20: as shown in FIG. 1, in this embodiment, The computing device 20 connected to the sewing machine 10 includes an input device 21, a memory module 22, a computing module 23, a determination module 24, and an output device 25.

The above-mentioned input device 21 is used to input the minimum remaining length of a bobbin thread, the total length of a bobbin thread, the length of the thread end and other sewing parameters and data of a preset pattern.

Among them, the above-mentioned preset pattern includes a plurality of sewing paths and a plurality of tangent points, and each sewing path is composed of a plurality of needle drop point coordinates, and contains the setting value of the intermediate presser foot height; wherein, the data of the stitch length can be calculated according to The distance between each needle entry point is obtained; the minimum remaining length of the above-mentioned bobbin thread refers to the minimum length required to retain the lower thread in consideration of calculation errors; the total length of the above-mentioned bobbin thread refers to the winding around the bobbin 311 (please refer to FIG. 4A ) The total length of the bobbin thread; and for the detailed description of the above sewing parameters, please refer to the description below.

The memory module 22 is used to obtain a current state length. In different embodiments, the current state length may be two values with different meanings according to the determination method. For details, please refer to the following description.

The calculation module 23 calculates a piece of sewing length after obtaining the data of the sewing parameters and the preset patterns. The next piece of sewing length refers to the length of bobbin thread required for the next sewing operation performed by the sewing machine 10 according to the path data. After obtaining the minimum remaining length, the total length of the bobbin thread, the next sewing length and the current state length, a first judgment value and a second judgment value are generated, and the first judgment value and the second judgment value are generated. The determination value is transmitted to the determination module 24 described above.

The determination module 24 is connected to the calculation module and the memory module, and after receiving the first determination value and the second determination value, generates a reminder message or generates an update message according to the size relationship between the two To update the value of the current state length and send the updated current state length to the memory module 22.

The output device 25 displays and generates a reminder signal after receiving the reminder message from the determination module 24 to let the user know that the length of the bobbin thread on the bobbin 311 is insufficient; specifically, in this embodiment, the output The device 25 may include a screen for displaying a warning sign and a buzzer (not shown) that emits a warning sound.

As can be seen from the above description and drawings, the hardware device applying the method for calculating the remaining length of the bobbin thread provided by the present invention may be the sewing machine 10 including the above-described computing device 20, or may be only a computing device externally used by the sewing machine 10 20.

Returning to the method section, please refer to FIG. 1, in this embodiment, the calculation device 20 calculates the length of the bobbin thread (the length of the bobbin thread away from the bobbin 311) that has been used in the sewing program that has been executed, plus an estimate After the length of the bobbin thread required for the next sewing program is executed, whether the sum is greater than the difference between the total length of the bobbin thread and the minimum remaining length of the bobbin thread is used to determine whether to issue the above reminder signal (first method). However, the present invention also provides another calculation method (second method) different from the above-mentioned first method. In other embodiments using the above-mentioned second method, the calculation device 20 uses the calculation of the remaining thread remaining on the bobbin 311 After the length of the bobbin thread required for the next sewing procedure is executed, whether the remaining amount is greater than the minimum remaining length of bobbin thread to determine whether to issue the above reminder signal; and whether to use the first method or the second method above, calculate The result is the same. In the following, for convenience of description, the first method will be described as an example.

As shown in FIG. 1, when the above-mentioned first method is executed to monitor a sewing procedure, first in an acquisition step, the minimum remaining length input through the input device 21, the total length of the bobbin thread in the bobbin 311, The sewing parameters, such as the thread length, cause the calculation module 23 to first generate the next sewing length through the sewing parameters and the sewing path; and obtain the current state length from the memory module 22; In terms of a method, in this embodiment, the current state length refers to the length of the bobbin thread that has been used for sewing. Therefore, when the monitoring in this embodiment is initially set, the initial value of the current state length is set to 0.

Next, in a judgment value generation step, a first judgment value and a second judgment value (and transmitted to the judgment module 24 are obtained according to the minimum remaining length, the next sewing length and the current state length ; Where, as described above, in the first method, the first judgment value is a value generated by adding the current state length to the next sewing length; the second judgment value is the total length of the bobbin thread minus the above The value generated by the minimum remaining length.

Next, coming to the judgment reminding step, after the judgment module 24 receives the first judgment value and the second judgment value, it compares the magnitude relationship between the first judgment value and the second judgment value; when judging the first When the judgment value is greater than the second judgment value, since such a result indicates that the length of the unused bobbin thread is insufficient and the next sewing procedure is scheduled, the judgment module 24 generates a reminder message and sends it to the output device 25 When the above reminder message is issued, when it is judged that the first judgment value is smaller than the second judgment value, the sewing machine 10 executes the next sewing procedure, and after executing the sewing procedure, by adding the value of the current length to the above In the manner of the numerical value of the sewing length, the numerical value of the current length is updated and stored in the memory module 22.

In addition, as mentioned in the preceding paragraph, this case also provides another calculation method for calculating the remaining length of the bobbin thread (the second method described above), which uses the calculation of the length of the bobbin thread remaining on the bobbin 311 to be used when performing a sewing program After the length of the bottom line, whether the remaining amount is greater than the minimum remaining length required by the bottom line to determine whether to send the above reminder signal.

Therefore, when the second method is used, the initial value of the current length is equal to the total length of the bottom line; and in the determination value generation step, the first determination value is directly obtained from the minimum remaining length, the second The judgment value is the current state length minus the next sewing length; and when updating the current state length in the judgment reminding step, the above value is updated by subtracting the sewing length value from the current length value The value of the current state length.

Finally, regarding the generation method of the next sewing length mentioned in the foregoing description of the first method and the second method, please refer to the following description in conjunction with FIGS. 3A to 4B:

As shown in FIG. 3A, in the actual sewing process, the sewing machine 10 mainly passes through a bobbin thread 31 and a needle thread 30 along a fixed distance through a material having a thickness of 51 and interlaces with each other to combine multiple layers of materials A plurality of stitches 40 are formed together; therefore, in order to calculate the length of the bobbin thread (the length of the stitches of the stitches at the stitches Ls) required to form the single stitch 40 described above in FIG. 3A, the The sewing parameter includes the correction coefficient C1, and the stitch length 50 (each stitch length is not necessarily equal) and the intermediate presser height setting value H of each stitch portion 40 in the sewing path are obtained.

Among them, regarding the above-mentioned intermediate presser foot height setting value H, please refer to FIGS. 4A and 4B. During the sewing process, in addition to a needle 11 of the above-mentioned sewing machine 10 will make a vertical reciprocating stroke, in order to fix the material to be sewn Position, a middle presser foot 12 of the sewing machine 10 moves toward the material before the needle 11 passes through the material, and clamps the material together with a needle plate 13 of the sewing machine 10, and then moves away from the above after threading Material, so the height setting value H of the intermediate presser foot is the interval distance 14 between the lowest point 121 of the intermediate presser foot 12 and a needle plate surface 131 of the needle plate 13 during the reciprocating stroke, and The above-mentioned intermediate presser foot height setting value H can be set to be slightly smaller than the above-mentioned thickness 51. In addition, please refer to FIG. 3C. When calculating the above-mentioned bobbin thread length Ls, there may be a difference in the thickness of the material due to the above-mentioned sewing path. The area of the material thickness consumes different lengths of the bottom line 31, for example, the first area 60 (having a first thickness 511) and the second area 61 (having a second thickness 512), so the intermediate presser height settings in different areas H can also be accompanied by correction of the calculated value of the length of the bobbin thread; and with respect to the above-mentioned correction coefficient C1, the above-mentioned correction coefficient C1 is due to the influence of the tension of the bobbin thread, the elasticity of the thread, or the softness and hardness of the sewing material, in order to obtain accurate calculation length, length of the stitch of the bottom portion 40 actually used for correcting coefficient; therefore the bottom line length is calculated for each of the 40 required for stitch portion can be expressed as: bottom portion 40 of the stitch length L s = (slit Mesh length 50 + intermediate presser foot height setting value H)* (1+ correction factor C 1 )

Among them, because the bobbin thread 31 and the needle thread 30 are usually knotted at the middle of the thickness 51, the bobbin thread 31 is calculated to be used in the length of the penetration material is equivalent to the length of the back to the intermediate point, so the input intermediate presser height setting The value H is the thickness 51 corresponding to the material threaded by the bottom thread 31.

In addition, please refer to FIG. 3B. Since the thread trimming action is not necessarily executed between each sewing path when sewing the pattern, a movement distance 501 that is greater than the stitch length 50 is directly moved through the moving needle, resulting in a The moving part 41, therefore, when calculating the above-mentioned next sewing length, it is necessary to take the next thread cutting action as the basis for calculating the overall length, and consider the length Lm of the lower thread consumed by the moving part 41 that may be formed during the movement, and apply Correction coefficient C2 of the moving part; where the correction coefficient C2 is due to the tension, elasticity of the bobbin thread or the softness and hardness of the material being sewn, and in order to obtain an accurate calculated length, the actual bobbin thread length of the mobile part 41 is used Make corrections; so that the calculation method of the bottom line length required by the moving part 41 can be expressed as: the bottom line length L m of the moving part 41 = moving distance 501* (1 + correction factor C 2 )

In addition to the length Ls of the bottom thread of the stitch 40, in the pattern of FIG. 3A, in addition to the need to pass the bottom thread 31 through the material at the beginning of the seam, the bottom thread 31 needs to be threaded through the material again at the end of the seam. When calculating the required sewing length of the next section in FIG. 3A, it is necessary to add the above-mentioned intermediate presser height setting value H at the end of the formula;

In addition, please also refer to Figure 3A. During the sewing process, since the sewing thread needs to be cut before the next sewing program can be carried out, the above sewing parameters also include a consideration from the thread cutting point 52 to the beginning of the sewing path. The thread length Bwaste obtained by adding the starting thread length 521 and the ending thread length 522 from the end of the sewing path to the tangent 52 is obtained.

Therefore, based on the above description, the calculation formula for the next sewing length Lseam required in the case where the moving portion 41 is not included as shown in FIG. 3A can be expressed as: the next sewing length L seam = all stitches 40 The total required bottom thread length Σ L s + intermediate presser foot height setting value H + thread head length B waste

In the case where FIG. 3B includes the stitch portion 40 and the moving portion 41 at the same time, the next sewing length Lseam is required, the calculation formula can be expressed as: the next sewing length L seam = all stitches 40 the bottom line length required sum Σ L s + length of bottom portion 41 required to move all the sum Σ L m + height set value of the presser head length H + B waste

Finally, it is specifically stated that the present invention does not specifically limit the details of the formula used in calculating the next sewing length. Those skilled in the art of the present invention should be able to change the calculation formula from the above description according to the general knowledge. content.

The above-mentioned embodiments are only for the convenience of describing the present invention, not to limit it. Without departing from the spirit of the present invention, those skilled in this industry who are familiar with the patent application scope of the present invention and various simple modifications and modifications made by the invention description should still be Included in the following patent applications.

10‧‧‧Sewing machine 11‧‧‧Needle 12‧‧‧ Medium presser foot 121‧‧‧Lowest point 13‧‧‧Needle plate 131‧‧‧Needle plate surface 14‧‧‧Space distance 20‧‧‧Computer 21 ‧‧‧Input device 22‧‧‧Memory module 23‧‧‧Calculation module 24‧‧‧Judgment module 25‧‧‧Output device 30‧‧‧Needle thread 31‧‧‧Bottom thread 311‧‧‧Bobber 40‧ ‧‧Mesh section 41‧‧‧Moving section 50‧‧‧Mesh length 501‧‧‧Movement distance 51‧‧‧Thickness 511‧‧‧First thickness 512‧‧‧Second thickness 52‧‧‧‧Tangent 521 ‧‧‧ Start thread length 522‧‧‧ End thread length 60‧‧‧ First area 61‧‧‧ Second area

FIG. 1 is a schematic diagram of the device of the present invention capable of calculating the remaining length of the bottom line in a preferred embodiment; FIG. 2 is a schematic diagram of the operation flow of the device in the embodiment of FIG. 1; FIGS. 3A to 3C are the embodiment of FIG. 2 4A and 4B are schematic diagrams of the operation of the intermediate presser foot in the embodiment of FIG. 1.

Claims (11)

A method for calculating the remaining length of the bobbin thread includes: an obtaining step of obtaining a minimum remaining length, a total length of the bobbin thread, a current state length of which sewing has been performed, and a next sewing length required for sewing a preset pattern; A judgment value generating step, using the minimum remaining length, the current state length and the next sewing length to generate a first judgment value and a second judgment value; a judgment reminder step, comparing the first judgment value and the first Two determination values, a reminder message is generated when the first determination value is greater than the second determination value, and the value of the current state length is updated when the first determination value is less than the second determination value. The method for calculating the remaining length of bobbin thread as described in claim 1, wherein the first judgment value is generated by adding the next sewing length to the current state length; the second judgment value is based on the total length of the bobbin thread Produced by subtracting the minimum remaining length. The method for calculating the remaining length of the bobbin thread as described in claim 1, wherein the first judgment value is directly generated from the minimum remaining length; the second judgment value is the current state length minus the next section of sewing Produced after the length. The method for calculating the remaining length of bobbin thread as described in item 1 of the claim, wherein the calculation of the next sewing length is by calculating the length of the stitches of the preset pattern and the setting value of the intermediate presser height when sewing the preset pattern produce. The method for calculating the remaining length of the bobbin thread as described in item 4 of the claim, wherein the calculation of the next sewing length further includes a thread end generated by the thread cutting operation before starting to sew a sewing path and after ending the above sewing path length. The method for calculating the remaining length of the bobbin thread as described in item 5 of the claim, wherein the preset pattern includes at least one stitch portion, and the calculation formula for the sewing length of the next segment is: Lseam=Σ Ls+H+Bwaste where, Lseam It is equal to the above-mentioned next sewing length; Ls is equal to the length of the bobbin thread required for the above-mentioned stitches; H is equal to the above-mentioned setting value of the intermediate presser foot height; The method for calculating the remaining length of the bobbin thread as described in item 5 of the claim, wherein the preset pattern includes at least one stitch portion and at least one moving portion, and the calculation formula for the next sewing length is: Lseam=Σ Ls+ Σ Lm+H+Bwaste where Lseam is equal to the above-mentioned next sewing length; Ls is equal to the length of the bobbin thread required for the above-mentioned seam section; Lm is equal to the bobbin thread length required for the above-mentioned moving section; H is equal to the above-mentioned intermediate presser foot height setting value; Bwaste It is equal to the length of a thread. The method for calculating the remaining length of the bobbin thread as described in item 4 of the claim, wherein the calculation of the next sewing length further includes a correction factor. The method for calculating the remaining length of the bottom line according to claim 4, wherein the preset pattern may include at least two different setting values of the intermediate presser foot height. An apparatus capable of calculating the remaining length of the bobbin thread, which uses the method for calculating the remaining length of the bobbin thread as described in one of claims 1 to 9, including: a sewing machine that can automatically perform sewing operations according to settings; At least one input device, connected to the sewing machine, for inputting the minimum remaining length, the total length of the bobbin thread, and a sewing parameter required for generating the next sewing length; a memory module connected to the sewing machine for recording the above Current state length; a calculation module, connected to the input device and the memory module, calculate the next sewing length after obtaining the sewing parameters, and obtain the minimum remaining length, the total length of the bobbin thread, the next sewing After the length and the length of the current state, the first judgment value and the second judgment value are generated; a judgment module, connected to the calculation module and the memory module, for passing the first judgment value and the second judgment The value generates a reminder message or updates the value of the current state length and sends it to the memory module; an output device receives the reminder message and displays or generates a reminder signal. A device capable of calculating the remaining length of the bobbin thread is used in conjunction with a sewing machine that can sew according to a set path. The above device uses the method for calculating the remaining length of the bobbin thread as described in one of claims 1 to 9 , Including: at least one input device for inputting the minimum remaining length, the total length of the lower thread and the sewing parameters required for generating the next sewing length; a memory module for recording the current state length; The calculation module is connected to the input device and the memory module, calculates the next sewing length after acquiring the sewing parameters, and obtains the minimum remaining length, the total length of the bobbin thread, the next sewing length and the current status After the length, the first judgment value and the second judgment value are generated; a judgment module is connected to the calculation module and the memory module to generate a reminder message through the first judgment value and the second judgment value Or update the value of the current state length and send it to the memory module.

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