CN110541245B - Sewing machine and sewing method - Google Patents
Sewing machine and sewing method Download PDFInfo
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- CN110541245B CN110541245B CN201810526192.8A CN201810526192A CN110541245B CN 110541245 B CN110541245 B CN 110541245B CN 201810526192 A CN201810526192 A CN 201810526192A CN 110541245 B CN110541245 B CN 110541245B
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- 238000009958 sewing Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 27
- 239000004744 fabric Substances 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
- D05B1/08—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
- D05B1/12—Lock-stitch seams
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/14—Needle-bar drives
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention belongs to the technical field of sewing machinery, relates to a sewing machine and a sewing method, and solves the problems of poor stability of the existing lock stitch loop and the like. The sewing machine comprises a machine head, a motor, a main shaft and a needle rod, wherein the motor and the main shaft are arranged on the machine head, the motor is connected with the main shaft, the main shaft is connected with the needle rod, the needle rod is provided with a needle, a needle plate is arranged below the needle rod, the needle moves to the needle plate from the lowest displacement point to form a first stroke, other strokes in the same period are second strokes, and the average rotating speed omega 1 of the motor in the first stroke is smaller than the average rotating speed omega 2 of the motor in the second stroke. The sewing method comprises the following steps: A. starting a motor, and driving the machine needle to move from top to bottom to the lowest displacement point at the average speed omega 2; B. reducing the average speed of the motor to omega 1 and driving the needle to move towards the needle plate from the lowest displacement point; C. the average speed of the motor is increased to omega 2, and the needle is driven to move to the highest displacement position. The invention can effectively improve the forming stability of the lock stitch loop.
Description
Technical Field
The invention belongs to the technical field of sewing machines, and relates to a sewing machine and a sewing method.
Background
Currently, the stitches of industrial sewing machines can be divided into chain stitches and lock-stitch. The lock stitch is the most common, when the sewing machine works, the motor rotates at a constant speed to drive the main shaft to rotate, so as to drive the needle in the material pricking mechanism to move, and the leading belt upper thread penetrates through the sewing material and is lifted upwards after reaching the lower limit position. Because friction exists between the sewing material and the sewing thread, the upper thread cannot be synchronously lifted along with the needle, but is retained below the sewing material and expands to the two sides of the needle under the action of elasticity to form a ring; then, the shuttle point of the rotating shuttle reaches the needle in the moving process, passes through the upper thread ring and continuously enlarges the hooked thread ring in the continuous rotating motion; after the rope is wound to the radius of the rope, the rope "jumps" over the expanded wire loop like jumping a rope; the next downward movement is the take-up of the thread take-up lever, the feed dog feeds the material to ensure that the movements have enough time to be carried out smoothly, and the rotating shuttle still rotates for a circle at the original speed, but does not hook the thread any more and only idles for a circle. Due to the take-up action of the take-up lever, the original thread is expanded by the rotating shuttle and rapidly reduced by jumping over the upper thread ring until the bottom thread led out from the rotating shuttle lock cylinder is drawn into the sewing material to form one-time interweaving. After the needle reaches the upper limit position, when the needle pierces the material downwards again, the sewing machine repeats the above action process, thereby forming a continuous regular lock stitch on the sewing material.
In this way, the wire loop is formed stably and reliably when the main shaft rotates at a low speed. However, as the rotation speed of the spindle increases, the time for forming the wire loop is short, the wire loop is small and unstable, and the wire loop is easily failed to cause wire breakage. The problem that the thread is easily broken at high speed is mainly that the needle rod rises quickly at the critical moment of thread loop formation at high speed, so that the thread loop cannot be formed in time, the needle brings back the upper thread together, the thread loop is small and unstable, and the rotating shuttle is easy to split the thread instead of passing through the thread loop at the moment of thread hooking.
Disclosure of Invention
The invention aims to provide a sewing machine and a sewing method aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to improve the loop forming stability of the lock stitch.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a sewing machine, sewing machine includes aircraft nose, motor, main shaft and needle bar, the motor is fixed in on the aircraft nose, the main shaft rotates and sets up on the aircraft nose, the output of motor is connected with the main shaft, the main shaft is connected with the needle bar through drive mechanism, the lower extreme of needle bar is provided with the eedle, the below of needle bar has the faller that supplies the eedle to pass, its characterized in that, the eedle is first stroke by this section stroke that its displacement minimum moved to faller department, and other strokes of this eedle are the second stroke in the same cycle, in the first stroke the average rotational speed omega 1 of motor is less than the average rotational speed omega 2 of motor in the second stroke.
In the sewing machine, the motor is a servo motor.
In the sewing machine described above, preferably, the magnitude of ω 1 is 1/2 of ω 2.
In the sewing machine, the transmission mechanism comprises a crank and a connecting rod, one end of the crank is connected with the end part of the main shaft, the other end of the crank is connected with one end of the connecting rod, the other end of the connecting rod is hinged to the needle rod, a sliding block is fixed on the needle rod, and the machine head is provided with a sliding rail matched with the sliding block along the vertical direction.
In order to achieve the above and other related objects, the present invention also provides a sewing method using the above sewing machine, characterized in that the sewing method comprises the steps of:
A. placing the cloth on a needle plate, starting a motor, driving a needle to penetrate the cloth and the needle plate from top to bottom at an average speed of omega 2, and moving the needle to the lowest displacement point of the needle;
B. reducing the average speed of the motor to omega 1 and driving the needle to move from the lowest displacement point to the needle plate;
C. the average speed of the motor is increased to omega 2, and the needle is driven to move to the highest displacement position.
In one of the sewing methods described above, the motor starts to decelerate when the needle reaches its lowest point of displacement, and starts to accelerate when the needle is lifted back and away from the needle plate.
In the above-mentioned sewing method, as another scheme, when the needle moves from top to bottom to be close to the cloth, the motor starts to decelerate, and when the lower end of the needle moves from bottom to top to be close to the cloth, the motor starts to accelerate.
Compared with the prior art, the invention has the following advantages:
the invention increases the time for forming the wire loop by reducing the average rotating speed of the motor in the first stroke, namely reducing the speed of the needle rising from the lowest displacement point to the needle plate, thereby enlarging the wire loop, effectively avoiding the wire from being split when the rotating shuttle hooks the wire and improving the stability for forming the wire loop of the lock stitch.
Drawings
FIG. 1 is a schematic view showing the structure of the sewing machine according to the embodiment.
FIG. 2 is a schematic structural diagram of a pricking mechanism of the sewing machine according to the embodiment.
FIG. 3 is a graph showing the relationship between the rotational speed and the angle of the motor of the sewing machine according to the embodiment.
In the figure, 1, a motor; 2. a main shaft; 3. a needle bar; 4. a transmission mechanism; 5. a needle; 6. a needle plate; 7. a crank; 8. a connecting rod; 9. a slider; 10. a slide rail.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the present sewing machine includes a head, a motor 1, a main shaft 2 and a needle bar 3, the motor 1 is fixed to the head, and the servo motor 1 is preferred in the present embodiment. The main shaft 2 is rotatably arranged on the machine head, the output end of the motor 1 is connected with the main shaft 2, the main shaft 2 is connected with a needle rod 3 through a transmission mechanism 4, a needle 5 is arranged at the lower end of the needle rod 3, a needle plate 6 for the needle 5 to penetrate is arranged below the needle rod 3, and specifically, the needle plate 6 is usually arranged on the bedplate and is positioned right below the needle 5. In this embodiment, the transmission mechanism 4 includes a crank 7 and a connecting rod 8, one end of the crank 7 is connected with the end of the main shaft 2, the other end of the crank 7 is connected with one end of the connecting rod 8, the other end of the connecting rod 8 is hinged on the needle rod 3, a sliding block 9 is fixed on the needle rod 3, and a sliding rail 10 matched with the sliding block 9 is arranged on the machine head along the vertical direction. The motor 1 rotates and can drive the needle rod 3 and the needle 5 to move sequentially through the main shaft 2, the crank 7 and the connecting rod 8.
When the motor 1 rotates, the needle rod 3 and the needle 5 can be driven to move by the main shaft 2 and the transmission mechanism 4, when the needle 5 moves, the needle moves downwards to the needle plate 6 from the highest displacement point, then continuously moves downwards to the lowest displacement point from the needle plate 6, then moves to the needle plate 6 from the lowest displacement point, and then continuously rises back to the highest displacement point from the needle plate 6, so that the needle 5 moves in a complete period. It is assumed that the stroke of the needle 5 from the lowest displacement point to the needle board 6 is a first stroke, and the other strokes of the needle 5 in the same period are second strokes, and the average rotation speed ω 1 of the motor 1 in the first stroke is smaller than the average rotation speed ω 2 of the motor 1 in the second stroke.
In the prior art, the motor 1 rotates at a constant speed in the whole period, and in the embodiment, because ω 1 is smaller than ω 2, namely the speed of the needle 5 rising from the lowest displacement point to the needle plate 6 is smaller than the rotating speed of the motor 1 in other strokes, correspondingly, compared with the prior art, the speed of the needle 5 rising from the lowest displacement point to the needle plate 6 is effectively reduced, and the time is the key time for forming the loop of the lock stitch, therefore, the time for forming the loop is increased correspondingly when the speed is reduced, the loop is enlarged, the thread is effectively prevented from being split when the rotating shuttle hooks the thread, and the stability for forming the loop of the lock stitch is improved.
Preferably, in the first stroke, the motor 1 rotates at a constant speed of ω 1, and in the second stroke, the motor 1 rotates at a constant speed of ω 2. The definition of the average rotation speed in the claims of the present application is to avoid that a sudden speed change is performed somewhere in the first stroke or the second stroke to cause that the sudden speed change is out of the protection range of the present application in order to avoid the need of subsequent development or the avoidance of competitors; in fact, if the motor 1 is otherwise shifted in the first stroke or in the second stroke, the object of the invention is still achieved, but the corresponding efficiency is not as good as in the preferred solution.
Preferably, ω 1 in the present application has a size of 1/2 of ω 2. By the design, enough thread loop forming time can be effectively ensured, and the sewing efficiency can be prevented from being influenced by excessively increasing the cycle length.
For example: if the normal rotation speed of the servo motor 1 of the main shaft 2 is 4000r/min, the lifting speed of the needle 5 when lifting from the lowest point to form a wire loop is V under the traditional condition. When the speed curve provided by the invention is used, the rising speed of the needle 5 rising from the lowest point to form a wire loop is V/2; at this time, the rotation speed of the motor 1 is calculated as follows
When rotating at a constant speed, the rotation period is as follows:
the first 3/4 cycles are:
the final 1/4 cycles are:
the rotational speed can then be determined:
namely, the actual working efficiency of the sewing machine is equivalent to 3200r/min by adopting the application. However, the formation of the wire loop is only 2000 r/min. Not only effectively ensuring the sewing efficiency, but also increasing the forming time of the wire loop and improving the forming stability of the wire loop.
As shown in fig. 3, the section of the stroke from point a to point b is a stage in which the needle 5 moves downward from the highest point, at this time, the rotation speed of the motor 1 is kept at 4000r/min, and from point b, the motor 1 starts to decelerate until the needle 5 reaches the lowest point, that is, the point c, and the needle 5 moves from the lowest point to the section of the distance at the needle plate 6, that is, the stroke from point c to point d in the drawing, and the motor 1 keeps transporting at a lower speed at a constant speed until the needle 5 reaches the needle plate 6, and the motor 1 starts to accelerate until the needle 5 reaches the highest point, that is, the stroke from point d to point e in the drawing.
A sewing method using the sewing machine is characterized by comprising the following steps:
A. placing the cloth on the needle plate 6, starting the motor 1, driving the needle 5 to penetrate the cloth and the needle plate 6 from top to bottom at an average speed of omega 2, and moving towards the lowest displacement point;
B. reducing the average speed of the motor 1 to omega 1 and driving the needle 5 to move from the lowest displacement point to the needle plate 6;
C. the average speed of the motor 1 is increased to omega 2, and the needle 5 is driven to move to the highest displacement position.
As a solution, the motor 1 starts decelerating when the needle 5 reaches its lowest point of displacement, until the motor 1 starts to accelerate when the needle 5 lifts back and leaves the needle board 6.
As another scheme, when the needle 5 moves from top to bottom to be close to the cloth, the motor 1 starts to decelerate, and when the lower end of the needle 5 rises back from bottom to top to be close to the cloth, the motor 1 starts to accelerate. For example, the motor 1 starts to decelerate at 1/50 cycles immediately before the needle 5 is about to penetrate the cloth. The deceleration duration is accelerated until 1/50 periods before the needle 5 leaves the cloth, and the acceleration is carried out until the period is finished.
In conclusion, the invention increases the time for forming the thread loop by reducing the average rotating speed of the motor 1 in the first stroke, namely reducing the speed of the needle 5 rising from the lowest displacement point to the needle plate 6, thereby enlarging the thread loop, effectively avoiding the thread from being split when the rotating shuttle hooks the thread and improving the thread loop forming stability of the lock stitch.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. A sewing machine comprises a machine head, a motor (1), a main shaft (2) and a needle bar (3), the motor (1) is fixed on the machine head, the main shaft (2) is rotationally arranged on the machine head, the output end of the motor (1) is connected with the main shaft (2), the main shaft (2) is connected with the needle bar (3) through the transmission mechanism (4), a needle (5) is arranged at the lower end of the needle rod (3), a needle plate (6) for the needle (5) to pass through is arranged below the needle rod (3), the needle (5) moves from the lowest displacement point to the needle plate (6) in a first stroke, other strokes of the needle (5) in the same period are second strokes, and the average rotating speed omega 1 of the motor (1) in the first stroke is smaller than the average rotating speed omega 2 of the motor (1) in the second stroke;
the transmission mechanism (4) comprises a crank (7) and a connecting rod (8), one end of the crank (7) is connected with the end of the main shaft (2), the other end of the crank (7) is connected with one end of the connecting rod (8), the other end of the connecting rod (8) is hinged to the needle rod (3), a sliding block (9) is fixed on the needle rod (3), and the machine head is provided with a sliding rail (10) matched with the sliding block (9) along the vertical direction.
2. Sewing machine as in claim 1, characterized in that said motor (1) is a servomotor (1).
3. Sewing machine according to claim 1 or 2, characterised in that the magnitude of ω 1 is 1/2 of ω 2.
4. A sewing method using the sewing machine according to claim 1, characterized in that the sewing method comprises the steps of:
A. placing the cloth on a needle plate (6), starting a motor (1), driving a needle (5) to penetrate through the cloth and the needle plate (6) from top to bottom at an average speed of omega 2, and moving towards the lowest displacement point of the needle plate;
B. reducing the average speed of the motor (1) to omega 1 and driving the needle (5) to move towards the needle plate (6) from the lowest displacement point;
C. the average speed of the motor (1) is increased to omega 2, and the needle (5) is driven to move to the highest displacement position.
5. Sewing method as in claim 4, characterized in that the motor (1) starts decelerating as soon as the needle (5) reaches its lowest point of displacement, and that the motor (1) starts accelerating as the needle (5) rises back and leaves the needle plate (6).
6. Sewing method as in claim 4, characterized in that when the needle (5) moves from top to bottom close to the cloth, the motor (1) starts to decelerate, and when the lower end of the needle (5) moves back from bottom to top close to the cloth, the motor (1) starts to accelerate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810526192.8A CN110541245B (en) | 2018-05-28 | 2018-05-28 | Sewing machine and sewing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810526192.8A CN110541245B (en) | 2018-05-28 | 2018-05-28 | Sewing machine and sewing method |
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| CN110541245A CN110541245A (en) | 2019-12-06 |
| CN110541245B true CN110541245B (en) | 2021-09-21 |
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| CN201810526192.8A Active CN110541245B (en) | 2018-05-28 | 2018-05-28 | Sewing machine and sewing method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117071198B (en) * | 2022-05-09 | 2025-09-23 | 拓卡奔马机电科技有限公司 | A method, system, device and storage medium for controlling the speed of a sewing machine |
| CN118854558B (en) * | 2024-09-05 | 2025-09-23 | 杰克科技股份有限公司 | A sewing machine anti-stitch skipping control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008126018A (en) * | 2006-11-27 | 2008-06-05 | Barudan Co Ltd | Multi-needle embroidery machine |
| CN101831767A (en) * | 2010-05-10 | 2010-09-15 | 朱强 | Needle bar driving mechanism of sewing machine and driving method thereof |
| JP4932388B2 (en) * | 2006-08-30 | 2012-05-16 | 株式会社ジェイテクト | Movable steering device |
| CN103374797A (en) * | 2012-04-27 | 2013-10-30 | Juki株式会社 | Sewing machine |
| CN203360800U (en) * | 2013-05-20 | 2013-12-25 | 浙江宝石机电股份有限公司 | Needle bar stroke changeable mechanism of sewing machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4932388B1 (en) * | 1970-03-20 | 1974-08-29 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4932388B2 (en) * | 2006-08-30 | 2012-05-16 | 株式会社ジェイテクト | Movable steering device |
| JP2008126018A (en) * | 2006-11-27 | 2008-06-05 | Barudan Co Ltd | Multi-needle embroidery machine |
| CN101831767A (en) * | 2010-05-10 | 2010-09-15 | 朱强 | Needle bar driving mechanism of sewing machine and driving method thereof |
| CN103374797A (en) * | 2012-04-27 | 2013-10-30 | Juki株式会社 | Sewing machine |
| CN203360800U (en) * | 2013-05-20 | 2013-12-25 | 浙江宝石机电股份有限公司 | Needle bar stroke changeable mechanism of sewing machine |
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