Dynamic balance outer shuttle holder design method, rotating shuttle, sewing machine and storage medium

Abstract

The present application relates to the technical field of sewing machines, and particularly relates to a dynamic balance outer shuttle holder design method, a rotating shuttle, a sewing machine and a storage medium, the dynamic balance outer shuttle holder design method comprising the following steps: constructing a dynamic model of the motion of the outer shuttle holder in motion simulation software; inputting a first size parameter range of an eccentricity compensation boss and a second size parameter range of an arc-shaped lightening groove into the motion simulation software; obtaining the center of mass coordinates and the rotation center coordinates of the dynamic model according to the dynamic model, and adjusting the size of the eccentricity compensation boss and the size of the arc-shaped lightening groove according to the first size parameter range and the second size parameter range, so that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the rotating shuttle dynamic balance design threshold; and forming a new dynamic model of the outer shuttle holder. The present application can improve the design efficiency, and can ensure that the rotating shuttle designed has small vibration, low noise and reduced track wear.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to a dynamic balancing external shuttle design method, a rotary shuttle, a sewing machine, and a storage medium. Background Technology

[0002] The rotary hook is the core component of a sewing machine that enables lockstitch stitches. It works in conjunction with the needle to hook the thread loop and form the stitch. The principle can be divided into four key steps: 1. Needle piercing to form a loop: The needle, carrying the top thread, pierces the fabric downwards. When the needle reaches its lowest point and begins to rise, due to the resistance of the fabric and the position of the needle eye, the top thread will form an open loop above the needle eye.

[0003] 2. The rotary hook catches the loop: The rotary hook rotates at high speed in a clockwise direction, and the tip of the rotary hook is precisely aligned with the position where the loop is formed, accurately hooking the loop and continuing to rotate with it.

[0004] 3. Bottom thread passes through the loop: The bobbin inside the shuttle carries the bottom thread. As the shuttle rotates, the bottom thread passes through the hooked loop, forming a cross knot.

[0005] 4. The thread loops tighten to form a stitch: After the rotary hook completes one revolution, the top thread is pulled upward by the sewing machine's take-up lever, tightening the crossed knots in the middle of the fabric. At the same time, the needle pierces downward again, starting the cycle of the next stitch.

[0006] The rotary shuttle consists of an inner shuttle frame and an outer shuttle frame, which are assembled together via a track. The outer shuttle frame is a high-speed rotating component with a high rotational speed. Because the outer shuttle frame is responsible for the hooking action, its center of gravity generally deviates from the rotation center due to structural factors. The surge in centrifugal force during high-speed operation of the outer shuttle frame leads to significant shuttle shuttle vibration, excessive noise, and track wear, which can severely cause the shuttle to break the thread and skip stitches.

[0007] Traditional rotary hook centroid design relies on engineers' experience, adjusting the centroid position by modifying model dimensions, and repeatedly modeling and measuring the centroid. This method is inefficient, resulting in rotary hooks with significant vibrations that fail to meet requirements.

[0008] Therefore, a dynamic balancing external shuttle design method, rotary hook, sewing machine, and storage medium are needed to solve the above problems. Summary of the Invention

[0009] The purpose of this invention is to provide a dynamic balance outer shuttle design method, a rotary shuttle, a sewing machine, and a storage medium, which can improve design efficiency and ensure that the designed rotary shuttle has low vibration, low noise, and reduced track wear.

[0010] To achieve this objective, the present invention adopts the following technical solution: The design method for a dynamically balanced outer shuttle frame includes the following steps: S1. Construct a dynamic model of the outer shuttle frame motion in motion simulation software, wherein the dynamic model of the outer shuttle frame has a parameterized eccentric compensation boss and an arc-shaped weight reduction groove, and the arc-shaped weight reduction groove is arranged along the circumference of the dynamic model. S2. Input the first size parameter range of the eccentric compensation boss and the second size parameter range of the arc-shaped weight reduction groove into the motion simulation software; S3. Obtain the center of mass coordinates and rotation center coordinates of the dynamic model according to the dynamic model, and adjust the size of the eccentric compensation boss according to the first size parameter range and the second size parameter range, so that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the dynamic balance design threshold of the shuttle. S4. Adjust the dynamic model based on the size parameters of the eccentric compensation boss and the arc-shaped weight reduction groove obtained according to the dynamic balance design threshold of the shuttle to form a new dynamic model of the outer shuttle frame.

[0011] In some embodiments, the method further includes step S5: performing a simulation test on the dynamic model of the new outer shuttle frame within a set rotational speed range to obtain the centrifugal force; if the centrifugal force is less than a set centrifugal force threshold, the design work is completed.

[0012] In some embodiments, if the centrifugal force is not less than the set centrifugal force threshold, steps S3-S5 are executed until the centrifugal force is less than the set centrifugal force threshold.

[0013] In some embodiments, the rotational speed range is greater than or equal to 5000 r / min and less than or equal to 12000 r / min.

[0014] In some embodiments, in step S2, the range of the first size parameters includes the length, width, and height of the eccentric compensation boss.

[0015] In some embodiments, in step S2, the range of the second size parameters includes the depth, width, corresponding central angle, and distance from the end face of the outer shuttle frame of the arc-shaped weight-reducing groove.

[0016] In some embodiments, in step S3, the eccentricity also needs to be adjusted in conjunction with the shape of the arc-shaped weight-reducing groove.

[0017] The rotary shuttle includes an inner shuttle frame and an outer shuttle frame, wherein the outer shuttle frame is designed and manufactured using the dynamic balance outer shuttle frame design method described above.

[0018] A sewing machine, comprising a sewing machine body and a rotary hook as described above, the rotary hook being mounted in the sewing machine body.

[0019] A storage medium containing a computer program that, when executed by a processor, implements the dynamic balancing outer shuttle design method described above.

[0020] The beneficial effects of this invention are: This invention provides a dynamic balancing method for designing an outer shuttle frame. A dynamic model of the outer shuttle frame's motion is constructed in motion simulation software. This model includes a parameterized eccentric compensation boss and an arc-shaped weight-reducing groove. The first dimensional parameter range of the eccentric compensation boss and the second dimensional parameter range of the arc-shaped weight-reducing groove are input into the motion simulation software. The coordinates of the center of mass and the center of rotation of the dynamic model are obtained. The dimensions of the eccentric compensation boss and the arc-shaped weight-reducing groove are adjusted according to the first and second dimensional parameter ranges, ensuring that the eccentricity formed by the difference between the center of mass coordinates and the center of rotation coordinates is less than or equal to the dynamic balancing design threshold of the shuttle frame. Finally, the dynamic model is adjusted based on the dimensional parameters of the eccentric compensation boss and the arc-shaped weight-reducing groove, which satisfy the dynamic balancing design threshold, to form a new dynamic model of the outer shuttle frame. By adjusting the eccentric compensation boss and the arc-shaped weight-reducing groove in motion simulation software according to the first and second size parameter ranges, the outer shuttle frame is automatically optimized. This ensures that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the dynamic balance design threshold of the rotary shuttle, and the designed parameters are then used to adjust the dynamic model of the outer shuttle frame in reverse. Designing the outer shuttle frame using this method improves design efficiency and ensures that the designed rotary shuttle has low vibration, low noise, and reduced track wear.

[0021] The present invention provides a rotary shuttle, including an inner shuttle frame and an outer shuttle frame, which can improve design efficiency and ensure that the designed rotary shuttle has low vibration, low noise and reduced track wear.

[0022] The sewing machine provided by the present invention includes a sewing machine body and a rotary hook as described above, which can improve design efficiency and ensure that the designed rotary hook has low vibration, low noise and reduced track wear.

[0023] The present invention provides a storage medium storing a computer program, which, when executed by a processor, implements the dynamic balancing external shuttle design method described above, thereby improving design efficiency and ensuring that the designed shuttle has low vibration, low noise, and reduced track wear. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a flowchart of a dynamic balancing external shuttle design method according to the present invention; Figure 2 This is a schematic diagram of the outer shuttle frame in the dynamic balancing outer shuttle frame design method of the present invention.

[0026] In the picture: 1. Outer shuttle frame; 11. Eccentric compensation boss; 12. Arc-shaped weight reduction groove. Detailed Implementation

[0027] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0028] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0029] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0030] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0031] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0032] The rotary hook is a crucial component of a sewing machine. However, the center of gravity of the outer shuttle frame in existing rotary hooks is generally offset from the center of rotation. The surge in centrifugal force during high-speed rotation of the outer shuttle frame leads to excessive shuttle vibration, excessive noise, and track wear, potentially causing thread breakage and skipped stitches. To address these issues, the outer shuttle frame needs to be redesigned. To improve design efficiency and ensure a redesigned rotary hook with low vibration, low noise, and reduced track wear, such as… Figures 1-2 As shown, this invention provides a method for designing a dynamically balanced outer shuttle. The method includes the following steps: S1. Construct a dynamic model of the motion of the outer shuttle frame 1 in motion simulation software. The dynamic model of the outer shuttle frame 1 has a parameterized eccentric compensation boss 11 and an arc-shaped weight reduction groove 12. The arc-shaped weight reduction groove 12 is arranged along the circumference of the dynamic model. S2. Input the first dimension parameter range of the eccentric compensation boss 11 and the second dimension parameter range of the arc-shaped weight reduction groove 12 into the motion simulation software. S3. Obtain the center of mass coordinates and rotation center coordinates of the dynamic model according to the dynamic model. Adjust the size of the eccentric compensation boss 11 and the size of the arc-shaped weight reduction groove 12 according to the first size parameter range and the second size parameter range, so that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the dynamic balance design threshold of the shuttle. S4. Adjust the dynamic model based on the dimensional parameters of the eccentric compensation boss 11 and the arc-shaped weight reduction groove 12 obtained according to the dynamic balance design threshold of the shuttle to form a new dynamic model of the outer shuttle frame 1.

[0033] By adjusting the eccentric compensation boss 11 and the arc-shaped weight-reducing groove 12 in motion simulation software according to the first and second size parameter ranges, the outer shuttle frame 1 is automatically optimized. This ensures that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the dynamic balance design threshold of the shuttle, and the designed parameters are then used to adjust the dynamic model of the outer shuttle frame 1 in reverse. Designing the outer shuttle frame 1 in this way improves design efficiency and ensures that the designed shuttle has low vibration, low noise, and reduced track wear. Specifically, designing the dimensions of the eccentric compensation boss 11 affects the final mass of the eccentric compensation boss 11, allowing the center of mass of the outer shuttle frame 1 to shift unidirectionally. Designing the dimensions of the arc-shaped weight-reducing groove 12 allows for adjustment of the angle and position of the center of mass of the outer shuttle frame 1.

[0034] In some embodiments, the dynamic balance design threshold for the rotary shuttle is less than or equal to 0.01 mm. This is achieved by ensuring that the coordinates of the center of mass and the center of rotation are as close as possible to each other. Only when the coordinates of the center of mass and the center of rotation are as close as possible to each other can the centrifugal force be reduced as much as possible. This solves the problem of large rotary shuttle vibration, excessive noise, and track wear caused by the surge in centrifugal force when the outer shuttle frame 1 is running at high speed, ensuring that the sewing machine can work efficiently.

[0035] In some embodiments, the dynamic balancing outer shuttle design method further includes step S5: performing simulation tests on the dynamic model of the new outer shuttle 1 within a set rotational speed range to obtain the centrifugal force. If the centrifugal force is less than a set centrifugal force threshold, the design work is completed. The set centrifugal force threshold is determined based on different models and materials of the outer shuttle 1, and is not subject to further restrictions here. After adjusting the dynamic model of the outer shuttle 1, simulation tests are performed within a set rotational speed range to verify the adjusted dynamic model. This avoids the defect that the static center of mass of the outer shuttle 1 is qualified, but the outer shuttle 1 still vibrates at high speed.

[0036] In some embodiments, if the centrifugal force is not less than a set centrifugal force threshold, steps S3-S5 are executed until the centrifugal force is less than the set centrifugal force threshold. If the centrifugal force is large, or if the design adjustment as described above still fails to meet the standard, it can be determined that the static centroid of the outer shuttle frame 1 is qualified, but there is still a defect of vibration during high-speed operation, requiring redesign and adjustment. By adopting the above method, a closed-loop design verification of the adjustment and validation of the dynamic model of the outer shuttle frame 1 can be achieved, which can significantly improve the design efficiency of the outer shuttle frame 1.

[0037] In some embodiments, the rotational speed range is greater than or equal to 5000 r / min and less than or equal to 12000 r / min. The operating speed of the rotary hook is typically greater than or equal to 5000 r / min and less than or equal to 12000 r / min. Higher speeds result in smoother continuous sewing and reduce time loss due to machine restarts. The lower limit of 5000 r / min meets the sewing needs of thick materials and coarse threads, preventing thread breakage and fabric wrinkling caused by excessive speed. The upper limit of 12000 r / min easily handles rapid splicing of thin materials and fine threads, achieving fine stitching. Within this speed range, the rotary hook's thread hooking timing is more precise, the stitch stability is better, and the probability of skipped stitches and thread breaks is reduced. A reasonable speed range can reduce the wear rate of the rotary hook, extend its service life, and reduce equipment maintenance costs. By simulating the dynamic model of the outer shuttle frame 1 within this speed range, it is possible to ensure that the simulation test results match the real-world application scenario, thus ensuring the effectiveness of the test.

[0038] In some embodiments, in step S2, the range of first dimensional parameters includes the length, width, and height of the eccentric compensation boss 11. By adjusting the length, width, and height of the eccentric compensation boss 11, the weight of the eccentric compensation boss 11 can be changed, thereby affecting the center of gravity distribution position of the outer shuttle 1.

[0039] In some embodiments, in step S2, the range of the second dimensional parameters includes the depth, width, and distance from the end face of the arc-shaped weight-reducing groove 12 to the end face of the outer shuttle frame 1. By adjusting the depth, width, and distance from the end face of the arc-shaped weight-reducing groove 12 to the end face of the outer shuttle frame 1, the weight of the outer shuttle frame 1 can be effectively adjusted, and the center of mass distribution can be directly adjusted by adjusting the distance from the arc-shaped weight-reducing groove 12 to the end face of the outer shuttle frame 1.

[0040] In some embodiments, in step S2, the second dimensional parameter further includes the angle of the central angle corresponding to the arc-shaped weight-reducing groove 12. By adjusting the angle of the central angle corresponding to the arc-shaped weight-reducing groove 12, the center of mass distribution of the outer shuttle frame 1 can be adjusted.

[0041] In some embodiments, in step S3, it is also necessary to adjust the eccentricity based on the shape of the arc-shaped weight-reducing groove 12. For example, the arc-shaped weight-reducing groove 12 can be a U-shaped groove, a triangular groove, or a trapezoidal groove. When the arc-shaped weight-reducing groove 12 adopts different shapes, it will directly affect the center of gravity distribution of the outer shuttle frame 1. Therefore, by reasonably designing the shape of the arc-shaped weight-reducing groove 12, it is possible to adjust the center of gravity distribution of the outer shuttle frame 1.

[0042] This embodiment also provides a rotary shuttle, which includes an inner shuttle frame and an outer shuttle frame 1. The outer shuttle frame 1 is designed and manufactured using the dynamic balancing outer shuttle frame design method described above. This improves design efficiency and ensures that the designed rotary shuttle has low vibration, low noise, and reduced track wear.

[0043] This embodiment also provides a sewing machine, which includes a sewing machine body and a rotary hook as described above, the rotary hook being installed in the sewing machine body. This improves design efficiency and ensures that the designed rotary hook has low vibration, low noise, and reduced track wear, guaranteeing that the sewing machine using this rotary hook can operate efficiently.

[0044] This embodiment also provides a storage medium, specifically a computer-readable storage medium, on which a computer program is stored. When executed by a processor, this program implements a dynamic balancing outer shuttle design method. This dynamic balancing outer shuttle design method includes the following steps: S1. Construct a dynamic model of the motion of the outer shuttle frame 1 in motion simulation software. The dynamic model of the outer shuttle frame 1 has a parameterized eccentric compensation boss 11 and an arc-shaped weight reduction groove 12. The arc-shaped weight reduction groove 12 is arranged along the circumference of the dynamic model. S2. Input the first dimension parameter range of the eccentric compensation boss 11 and the second dimension parameter range of the arc-shaped weight reduction groove 12 into the motion simulation software. S3. Obtain the center of mass coordinates and rotation center coordinates of the dynamic model according to the dynamic model. Adjust the size of the eccentric compensation boss 11 and the size of the arc-shaped weight reduction groove 12 according to the first size parameter range and the second size parameter range, so that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the dynamic balance design threshold of the shuttle. S4. Adjust the dynamic model based on the dimensional parameters of the eccentric compensation boss 11 and the arc-shaped weight reduction groove 12 obtained according to the dynamic balance design threshold of the shuttle to form a new dynamic model of the outer shuttle frame 1.

[0045] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0046] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0047] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0048] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for designing a dynamically balanced outer shuttle frame, characterized in that, Includes the following steps: S1. Construct a dynamic model of the motion of the outer shuttle frame (1) in motion simulation software. The dynamic model of the outer shuttle frame (1) has a parameterized eccentric compensation boss (11) and an arc-shaped weight reduction groove (12). The arc-shaped weight reduction groove (12) is arranged along the circumference of the dynamic model. S2. Input the first size parameter range of the eccentric compensation boss (11) and the second size parameter range of the arc-shaped weight reduction groove (12) into the motion simulation software; S3. Obtain the center of mass coordinates and rotation center coordinates of the dynamic model according to the dynamic model, and adjust the size of the eccentric compensation boss (11) according to the first size parameter range and the second size parameter range, so that the eccentricity formed by the difference between the center of mass coordinates and the rotation center coordinates is less than or equal to the dynamic balance design threshold of the shuttle. S4. Adjust the dynamic model according to the size parameters of the eccentric compensation boss (11) and the arc-shaped weight reduction groove (12) obtained according to the dynamic balance design threshold of the shuttle, and form a new dynamic model of the outer shuttle frame (1).

2. The dynamic balancing outer shuttle design method according to claim 1, characterized in that, It also includes step S5, which involves simulating the dynamic model of the new outer shuttle frame (1) within a set rotational speed range to obtain the centrifugal force. If the centrifugal force is less than the set centrifugal force threshold, the design work is completed.

3. The dynamic balancing outer shuttle design method according to claim 2, characterized in that, If the centrifugal force is not less than the set centrifugal force threshold, then steps S3-S5 are executed until the centrifugal force is less than the set centrifugal force threshold.

4. The dynamic balancing outer shuttle design method according to claim 2, characterized in that, The specified speed range is greater than or equal to 5000 r / min and less than or equal to 12000 r / min.

5. The dynamic balancing outer shuttle design method according to claim 1, characterized in that, In step S2, the first size parameter range includes the length, width and height of the eccentric compensation boss (11).

6. The dynamic balancing outer shuttle design method according to claim 1, characterized in that, In step S2, the range of the second size parameters includes the depth, width, corresponding central angle, and distance from the end face of the outer shuttle frame (1) of the arc-shaped weight reduction groove (12).

7. The dynamic balancing outer shuttle design method according to claim 6, characterized in that, In step S3, the eccentricity also needs to be adjusted according to the shape of the arc-shaped weight reduction groove (12).

8. A rotary shuttle, characterized in that, It includes an inner shuttle frame and an outer shuttle frame (1), wherein the outer shuttle frame (1) is designed and manufactured using the dynamic balance outer shuttle frame design method as described in any one of claims 1-7.

9. A sewing machine, characterized in that, It includes a sewing machine body and a rotary hook as described in claim 8, the rotary hook being installed in the sewing machine body.

10. A storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the dynamic balancing external shuttle design method as described in any one of claims 1-7.

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