CN111764057B - Constant pressure structure of presser foot of sewing machine and sewing machine - Google Patents
Constant pressure structure of presser foot of sewing machine and sewing machine Download PDFInfo
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- CN111764057B CN111764057B CN201910258982.7A CN201910258982A CN111764057B CN 111764057 B CN111764057 B CN 111764057B CN 201910258982 A CN201910258982 A CN 201910258982A CN 111764057 B CN111764057 B CN 111764057B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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- 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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- Textile Engineering (AREA)
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- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention discloses a constant pressure structure of a presser foot of a sewing machine and the sewing machine. The sewing machine comprises a pressure lever spring and a pressure foot arm. The pressure foot pressure constant structure comprises a pressure detector, an electric control device, an electrified conductor and a pressure foot pressure constant device. The pressure detector detects the pressure applied on the pressure foot arm by the pressure rod in real time and sends a pressure signal; the electric control device outputs current according to the pressure signal; the electrified conductor is arranged on the pressure pin arm; the pressure foot pressure constant device is provided with a correlation magnetic field. The pressure detector feeds back the pressure applied on the presser foot arm to the electric control device in time. The electric control device can send corresponding current according to the pressure change. Current flows through the current conductor. This produces an ampere force under the influence of the oppositely directed magnetic fields. The ampere force is applied on the presser foot arm to keep the pressure on the presser foot arm constant, thereby avoiding the problems of wrong layers, unattractive stitches and the like when the sewing machine runs at high speed.
Description
Technical Field
The invention relates to the technical field of sewing machine presser feet, in particular to a constant pressure structure of a sewing machine presser foot and a sewing machine.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, rayon and the like and products such as leather, plastics, paper and the like. The stitch sewed by the sewing machine is neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. And derives the artistic forms of hand-push embroidery, computer embroidery, etc.
At present, a presser bar mechanism is provided in each type of sewing machine. And along with the rotating speed of the existing sewing machine is higher and higher, the reaction speed of a pressure bar spring of the sewing machine cannot keep up with the cloth feeding speed of teeth, so that the pressure value of the pressure foot in a period of time is far less than the normal pressure value. And the phenomena of layer dislocation, unattractive stitch and the like can occur in the period of time. And when the too thick too big pressure that leads to of overleaf stalk and the surface fabric of sewing is thinner leads to the pressure undersize, also can make the sewing machine in the in-process of making the phenomenon such as the staggered floor appears and the stitch is unsightly.
Disclosure of Invention
The invention aims to provide a constant pressure structure of a presser foot of a sewing machine and the sewing machine. The constant structure of presser foot pressure of sewing machine is in order to solve when sewing machine high-speed operation, and the pressure value of presser foot can't keep invariable when being less than normal pressure value far away in a period among the current sewing machine to the problem that staggered floor and stitch seam are unsightly appears when leading to making.
In order to achieve the purpose, the invention provides the following technical scheme: a presser foot pressure constant structure of a sewing machine, the sewing machine comprising:
a pressure lever;
the pressure foot arm is positioned below the pressure rod and is abutted against the pressure rod;
the presser foot pressure constant structure is used for ensuring that the pressure applied to the presser foot arm by the pressure lever is a constant pressure value when the sewing machine operates;
the presser foot pressure constant structure includes:
the pressure detector is arranged on the presser foot arm, detects the pressure applied on the presser foot arm by the presser bar in real time when the sewing machine runs at a high speed, and sends a pressure signal;
the electric control device is used for receiving the pressure signal and outputting current according to the pressure signal;
the electrified conductor is arranged on the pressure pin arm and is electrically connected with the electric control device to form an electrified loop for the current to flow;
a presser foot pressure constant device having a correlation magnetic field; the electrified conductor is positioned in the correlation magnetic field and is vertical to the direction of magnetic induction lines of the correlation magnetic field; the pressure foot pressure constant device generates an ampere force when current flows in the electrified conductor; the ampere force points to the pressure foot arm and is applied to the pressure foot arm together with the pressure force to ensure that the pressure force applied to the pressure foot arm by the pressure rod is a constant pressure value.
Preferably, the sewing machine further comprises a machine shell, and one end of the pressure lever, which is far away from the pressure foot arm, is movably arranged on the machine shell; the presser foot pressure constant device comprises two permanent magnets which are oppositely arranged, and the two permanent magnets are symmetrical about the presser foot arm and are both arranged on the machine shell.
Preferably, the upper ends of the two permanent magnets are connected through a connecting rod, and the connecting rod is mounted on the machine shell through a rotating mechanism and can rotate relative to the rotating mechanism.
Preferably, the two permanent magnets and the connecting rod are of an integrally formed structure.
Preferably, the rotating mechanism includes:
each group of mounting mechanisms comprises two oppositely arranged connecting plates, one end of each connecting plate is mounted on the connecting rod, and the other end of each connecting plate is provided with a pin hole;
the mounting block is arranged between the two corresponding connecting plates, one end of each mounting block is symmetrically provided with two pin grooves, and the other end of each mounting block is arranged on the shell; each pin groove is connected with the corresponding pin hole through a pin;
wherein the connecting rod rotates relative to the mounting block.
Preferably, the rotating mechanism is a hinge, one end of the hinge is mounted on the connecting rod, and the other end of the hinge is mounted on the casing.
Preferably, the current conductor and the presser foot arm (2) are insulated from each other: the pressure foot arm (2) is made of insulating materials, or an insulating layer is arranged between the electrified conductor and the pressure foot arm (2), or the electrified conductor is subjected to insulating treatment.
Preferably, the sewing machine further comprises a pressure lever wrench, wherein the pressure lever wrench is movably connected with the pressure lever and is connected with the pressure foot pressure constant device through a linkage mechanism;
the linkage mechanism drives the presser foot pressure constant device to rotate to be in a flat shape with the presser foot arm when the pressure lever wrench is pressed downwards, and drives the presser foot pressure constant device to rotate to be perpendicular to the presser foot arm when the pressure lever wrench moves upwards to restore the original position.
The present invention also provides a sewing machine, comprising:
a pressure lever;
the pressure foot arm is positioned below the pressure rod and is abutted against the pressure rod;
the sewing machine further includes:
a presser foot pressure constant structure, which is any of the above presser foot pressure constant structures.
Preferably, the sewing machine further comprises a pressure lever wrench, and the pressure lever wrench is movably connected with the pressure lever;
the pressure lever is separated from the pressure foot arm when the pressure lever wrench is pressed downwards, and abuts against the pressure foot arm when the pressure lever wrench moves upwards to restore the original position.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, when the sewing machine runs at high speed, the pressure detector feeds back the pressure applied on the presser foot arm to the electric control device in time. The electric control device can send corresponding current according to the pressure change. Current flows through the current conductor. This produces an ampere force under the influence of the oppositely directed magnetic fields. The ampere force is applied on the presser foot arm to keep the pressure on the presser foot arm constant, thereby avoiding the problems of staggered layers, unattractive stitches and the like in the sewing process caused by untimely reaction of a spring on the presser bar when the sewing machine runs at a high speed. Meanwhile, the presser foot arm and the presser foot pressure constant device form a thrust electromagnet structure, so that the space occupied by the presser foot pressure constant structure and the cost of the presser foot pressure constant structure can be greatly saved, and the feasibility of applying the presser foot pressure constant structure on a machine is improved.
Drawings
FIG. 1 is a schematic view showing a structure of a sewing machine according to embodiment 1;
FIG. 2 is a schematic view of a structure of the presser foot pressure constant device separated from the presser foot arm;
fig. 3 is a schematic view of the structure of the presser foot pressure constant device and the presser foot arm without separation.
In the figure: the pressure foot pressure constant device comprises a pressure foot pressure constant device 1, a permanent magnet 11, a connecting rod 12, a pressure foot arm 2, a pressure detector 3, a pressure rod 4, a casing 5 and a pressure rod wrench 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a constant pressure structure of a presser foot of a sewing machine, which is applied to the sewing machine. Referring to fig. 1, the sewing machine includes a presser foot arm 2, a presser bar 4, and a housing 5. The pressure foot arm 2 is positioned below the pressure lever 4 and is propped against the pressure lever 4. One end of the pressure lever 4 far away from the pressure foot arm 2 is movably arranged on the shell 5.
The pressure foot pressure constant structure in the embodiment is used for solving the problems that the pressure value on the pressure foot is far smaller than the normal pressure value due to untimely reaction of the spring on the pressure rod 4 when the sewing machine is in a high-speed state, so that the problem of staggered layers or unattractive stitches occurs in the sewing process.
Referring to fig. 2, the presser foot pressure constant structure is provided for ensuring that the pressure applied by the presser bar 4 to the presser foot arm 2 is a constant pressure value when the sewing machine is in operation. The pressure constant structure comprises a pressure detector 3, an electric control device, a current conductor and a pressure foot pressure constant device 1.
Wherein, the pressure detector 3 is arranged on the presser foot arm 2, and detects the pressure exerted on the presser foot arm 2 by the presser bar 4 in real time and sends a pressure signal when the sewing machine runs at a high speed. The pressure detector 3 in the present embodiment may be a pressure sensor.
The electric control device is used for receiving the pressure signal and outputting current according to the pressure signal. The electrified conductor is arranged on the pressure pin arm 2 and is electrically connected with the electric control device to form an electrified loop for current to flow. The electrified conductor and the presser foot arm 2 can be of an integrated structure. The presser foot arm 2 does not need to be made of insulating materials, so long as the mutual insulation between the electrified conductor arranged on the presser foot arm 2 and the presser foot arm 2 is ensured, and the electrified conductor has a complete loop. The electrified conductor and the presser foot arm 2 are mutually insulated, and various realization modes can be adopted: the presser foot arm 2 is made of an insulating material, or an insulating layer is arranged between a current conductor and the presser foot arm 2, or the current conductor is subjected to insulation treatment. In the embodiment, the presser foot arm 2 is made of insulating materials so as to ensure that current only flows in the electrified conductor; the electrified conductor can be copper sheets, copper strips, aluminum strips and other metals, and current flows in the electrified loop.
The presser foot pressure stabilizing device 1 has a correlation magnetic field. The electrified conductor is positioned in the correlation magnetic field and is vertical to the direction of magnetic induction lines of the correlation magnetic field. The pressure foot pressure constant device 1 generates an ampere force to the pressure foot arm 2 when current flows in the electrified conductor; the direction of the ampere force is directed to the presser foot arm 2, and the ampere force is applied to the presser foot arm 2 together with the pressure to ensure that the pressure applied to the presser foot arm 2 by the pressure rod 4 is a constant pressure value. When the pressure is larger than the constant pressure value, the ampere force is vertically upward and points to the pressure foot arm 2; when the pressure is less than the constant pressure value, the direction of the ampere force is vertically downward and directed toward the presser arm 2. In this embodiment, the presser foot pressure stabilizing device 1 may include two permanent magnets 11 disposed opposite to each other. The two permanent magnets 11 are symmetrical with respect to the presser arm 2 and are both mounted on the housing 5. A bijection magnetic field is formed between the two permanent magnets 11.
In this embodiment, when the sewing machine is operated at a high speed, the pressure detector 3 feeds back the pressure applied to the presser arm 2 to the electric control device in time. The electric control device can send corresponding current according to the pressure change. Current flows through the current conductor. This produces an ampere force under the influence of the oppositely directed magnetic fields. The ampere force is applied to the presser foot arm 2 to keep the pressure applied to the presser foot arm 2 constant, so that the problems of layer staggering, thread stitching and the like caused by untimely reaction of a spring on the pressure lever 4 in the sewing process when the sewing machine runs at a high speed are avoided. Meanwhile, in the embodiment, the presser foot arm 2 and the presser foot pressure constant device 1 form a thrust electromagnet structure, so that the space occupied by the presser foot pressure constant structure and the cost of the presser foot pressure constant structure can be greatly saved, and the feasibility of the application of the presser foot pressure constant structure on a machine is improved.
Example 2
Referring to fig. 3, in the present embodiment, the upper ends of two permanent magnets 11 are connected by a link 12. Preferably, the two permanent magnets 11 and the connecting rod 12 are integrally formed. The link 12 is mounted on the housing 5 via a rotation mechanism and can rotate relative to the rotation mechanism. Thus, when the presser arm 2 needs to be replaced or maintained, the connecting rod 12 is manually rotated to separate the two permanent magnets 11 from the presser arm 2.
The rotation mechanism may include a mounting mechanism and a mounting block.
Wherein at least one group of installation mechanisms is arranged. Each group of mounting mechanisms comprises two connecting plates which are oppositely arranged, one end of each connecting plate is mounted on the connecting rod 12, and the other end of each connecting plate is provided with a pin hole.
The number of the mounting blocks is at least one, and the mounting blocks correspond to at least one group of mounting mechanisms. Each mounting block is located between two corresponding connecting plates. Two pin grooves are symmetrically formed in one end of each mounting block. The other end of each mounting block is mounted on the housing 5. Each pin slot is connected with a corresponding pin hole through a pin. The link 12 rotates relative to the mounting block. Therefore, when the presser arm 2 needs to be cleaned or maintained, a worker manually pulls the two permanent magnets 11 upwards.
In some embodiments, the rotation mechanism may be a hinge. One end of the hinge is mounted on the link 12 and the other end of the hinge is mounted on the housing 5.
Example 3
The embodiment provides a sewing machine. The sewing machine includes the structure of embodiment 1. The sewing machine further comprises a pressure lever wrench 6 and a pressure foot pressure constant structure.
Wherein, the pressure lever wrench 6 is movably connected with the pressure lever 4. The pressure lever 4 is separated from the pressure foot arm 2 when the pressure lever wrench 6 is pressed down, and abuts against the pressure foot arm 2 when the pressure lever wrench 6 moves upwards to restore the original position. Because the limiting device at the lower end of the pressure rod 4 can limit the left and right movement of the presser foot arm 2, when threading, cleaning, maintenance and adjustment are needed, the pressure rod wrench 6 is pressed down, so that the pressure rod wrench 6 is separated from the presser foot arm 2. Then the presser foot arm 2 is pulled out manually.
The presser foot pressure constant structure is the presser foot pressure constant structure of embodiments 1 to 2, which is used for ensuring that the pressure applied to the presser foot arm 2 by the presser bar 4 is a constant pressure value when the sewing machine is operated at a high speed.
In some embodiments, the presser foot pressure keeping device 1 on the presser foot pressure keeping structure may be connected to the pressure bar wrench 6 through a linkage mechanism. The linkage mechanism drives the presser foot pressure constant device 1 to rotate to be in a flat shape (as shown in fig. 2) with the presser foot arm 2 when the pressure lever wrench 6 is pressed downwards, and drives the presser foot pressure constant device 1 to rotate to be in a vertical shape (as shown in fig. 3) with the presser foot arm 2 when the pressure lever wrench 6 moves upwards to restore the original position. Therefore, when the pressure bar wrench 6 is pressed down, the pressure foot pressure constant device 1 and the pressure bar 4 are separated from the pressure foot arm 2, and the pressure foot pressure constant device 1 does not need to be manually pulled again, so that the pressure foot pressure constant device 1 is separated from the pressure foot arm 2. Meanwhile, in some embodiments, a driving mechanism capable of rotating the presser foot pressure keeping device 1 is installed on the housing 5. Meanwhile, the driving mechanism is in signal transmission with the pressure detector 3 on the presser arm 2 in some embodiments, so as to realize the automatic lifting and lowering of the presser pressure constant device 1. The method specifically comprises the following steps: when the sewing machine stops operating and the presser foot arm needs to be pulled out, the pressure lever wrench is pressed down, and the presser foot arm 2 is separated from the pressure lever 4. At this time, the pressure detected by the pressure detector 3 of the presser arm 2 is small (theoretically becomes 0) and outputs a detection signal. At this time, the driving mechanism receives the pressure signal, and controls the lifting of the presser foot pressure constant device 1, thereby preventing the presser foot pressure constant device 1 from limiting the presser foot arm 2.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A presser foot pressure constant structure of a sewing machine, the sewing machine comprising:
a pressure lever (4);
the pressure foot arm (2) is positioned below the pressure lever (4) and is abutted against the pressure lever (4);
the pressure foot pressure constant structure is characterized in that when the sewing machine operates, the pressure foot pressure constant structure is used for ensuring that the pressure applied to the pressure foot arm (2) by the pressure rod (4) is a constant pressure value; the presser foot pressure constant structure includes:
the pressure detector (3) detects the pressure applied on the presser foot arm (2) by the pressure rod (4) in real time and sends out a pressure signal when the sewing machine operates;
the electric control device is used for receiving the pressure signal and outputting current according to the pressure signal;
the electrifying conductor is arranged on the pressure pin arm (2) and is electrically connected with the electric control device to form an electrifying loop for the current to flow;
a presser foot pressure constant device (1) having a correlation magnetic field; the electrified conductor is positioned in the correlation magnetic field and is vertical to the direction of magnetic induction lines of the correlation magnetic field; the presser foot pressure constant device (1) generates an ampere force when the current flows in the electrified conductor; the ampere force points to the presser foot arm (2) and is applied to the presser foot arm (2) together with the pressure to ensure that the pressure applied to the presser foot arm (2) by the pressure lever (4) is a constant pressure value;
the pressure lever wrench (6), the said pressure lever wrench (6) is connected with said pressure lever (4) movably, and connect with said presser foot pressure invariable device (1) through a linkage mechanism;
the linkage mechanism drives the presser foot pressure constant device (1) to rotate to be in a flat shape with the presser foot arm (2) when the pressure lever wrench (6) is pressed downwards, and drives the presser foot pressure constant device (1) to rotate to be perpendicular to the presser foot arm (2) when the pressure lever wrench (6) moves upwards to restore the original position.
2. The presser foot pressure constant structure of claim 1, wherein said sewing machine further comprises a housing (5), and an end of said presser bar (4) remote from said presser arm (2) is movably mounted on said housing (5); the presser foot pressure constant device (1) comprises two permanent magnets (11) which are oppositely arranged, wherein the two permanent magnets (11) are symmetrical relative to the presser foot arm (2) and are both arranged on the machine shell (5).
3. The presser foot pressure constancy structure for sewing machines according to claim 2, characterized in that the upper ends of the two permanent magnets (11) are connected by a connecting rod (12), said connecting rod (12) being mounted on said machine housing (5) by means of a rotation mechanism and being able to rotate with respect to the rotation mechanism.
4. The presser foot pressure stabilizing structure of claim 3, wherein the two permanent magnets (11) and the one link (12) are of an integrally formed structure.
5. The sewing machine presser foot pressure constancy structure according to claim 3, characterized in that said rotation mechanism comprises:
each group of mounting mechanisms comprises two oppositely arranged connecting plates, one end of each connecting plate is mounted on the connecting rod (12), and the other end of each connecting plate is provided with a pin hole;
at least one mounting block corresponding to at least one group of mounting mechanisms, wherein each mounting block is positioned between the corresponding two connecting plates, one end of each mounting block is symmetrically provided with two pin grooves, and the other end of each mounting block is mounted on the shell (5); each pin groove is connected with the corresponding pin hole through a pin;
wherein the connecting rod (12) rotates relative to the mounting block.
6. Sewing machine presser foot pressure constancy structure according to claim 3, characterized in that said rotation mechanism is a hinge, one end of which is mounted on said connecting rod (12) and the other end of which is mounted on said casing (5).
7. The presser foot pressure constancy structure of sewing machines according to claim 1, characterized in that the energized conductor is insulated from the presser arm (2): the pressure foot arm (2) is made of insulating materials, or an insulating layer is arranged between the electrified conductor and the pressure foot arm (2), or the electrified conductor is subjected to insulating treatment.
8. A sewing machine, comprising:
a pressure lever (4);
the pressure foot arm (2) is positioned below the pressure lever (4) and is abutted against the pressure lever (4);
characterized in that, the sewing machine further comprises:
a presser foot pressure constant structure of the sewing machine according to any one of claims 1 to 7.
9. The sewing machine according to claim 8, further comprising a lever wrench (6), the lever wrench (6) being movably connected to the lever (4);
the pressure lever (4) is separated from the pressure foot arm (2) when the pressure lever wrench (6) is pressed downwards, and abuts against the pressure foot arm (2) when the pressure lever wrench (6) moves upwards to restore the original position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910258982.7A CN111764057B (en) | 2019-04-01 | 2019-04-01 | Constant pressure structure of presser foot of sewing machine and sewing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910258982.7A CN111764057B (en) | 2019-04-01 | 2019-04-01 | Constant pressure structure of presser foot of sewing machine and sewing machine |
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| CN111764057A CN111764057A (en) | 2020-10-13 |
| CN111764057B true CN111764057B (en) | 2021-12-21 |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2660235B2 (en) * | 1989-12-11 | 1997-10-08 | ペガサスミシン製造株式会社 | Sewing machine presser presser |
| JP4473671B2 (en) * | 2004-07-30 | 2010-06-02 | ペガサスミシン製造株式会社 | Sewing machine presser equipment |
| JP2010179013A (en) * | 2009-02-09 | 2010-08-19 | Juki Corp | Bobbin thread tension control equipment of sewing machine |
| CN204029686U (en) * | 2014-07-24 | 2014-12-17 | 科都电气有限公司 | A kind of kick rotary switch |
| CN104294486B (en) * | 2014-09-30 | 2017-01-11 | 浙江理工大学 | Device and method for detecting pressure of presser foot of sewing machine |
| CN204138893U (en) * | 2014-09-30 | 2015-02-04 | 浙江理工大学 | A kind of pressure for presser foot of sewing machine checkout gear |
| CN204780219U (en) * | 2015-06-10 | 2015-11-18 | 吴江市震宇缝制设备有限公司 | Prevent difficult to handle sewing machine protection casing that indicates |
| CN109518365A (en) * | 2017-09-18 | 2019-03-26 | 浙江中捷缝纫科技有限公司 | Presser foot lifter control method, device, storage medium and the processor of sewing machine |
| CN207468872U (en) * | 2017-11-15 | 2018-06-08 | 江西三江精密针车有限公司 | A kind of sewing machine equipped with multilayer needle plate |
| CN109058798B (en) * | 2018-07-18 | 2020-11-06 | 浙江天平光电科技有限公司 | Direct current cluster lamp that can be stable |
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2019
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Address after: 318000 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee after: Jack Technology Co.,Ltd. Address before: 318000 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |
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Address after: 318000 no.1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318000 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: Jack Technology Co.,Ltd. |