CN109652928B - Knee rest device of sewing machine - Google Patents
Knee rest device of sewing machine Download PDFInfo
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- CN109652928B CN109652928B CN201910129719.8A CN201910129719A CN109652928B CN 109652928 B CN109652928 B CN 109652928B CN 201910129719 A CN201910129719 A CN 201910129719A CN 109652928 B CN109652928 B CN 109652928B
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- knee
- sewing machine
- rod
- knee rest
- presser foot
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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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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a knee rest device of a sewing machine, and belongs to the technical field of clothing manufacturing equipment. The technical problem that misoperation occurs easily in the knee rest device of the existing sewing machine is solved. This knee is leaned on device includes that the knee leans on the dish, leans on the control rod that the dish is connected with the knee, the axis of rotation and sets firmly the pivoted crank at the axis of rotation, pivoted crank's one end top is equipped with vertical ejector pin, the control rod is connected with the axis of rotation and the control rod swing can drive the axis of rotation and rotate, the knee leans on the device still including can restrict the wobbling driving piece of control rod, can detect whether sewing machine is at sewing moving detection mechanism and protection switch. The knee rest device can effectively prevent a worker from lifting the presser foot due to misoperation of the operating lever during sewing, thereby ensuring that the phenomenon of disordered cloth stitches caused by insufficient pressure of the presser foot is avoided, and further achieving the effect of attractive overall cloth stitches.
Description
Technical Field
The invention belongs to the technical field of sewing machines, and relates to a knee rest device of 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, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. The presser foot is an important component on the sewing machine, and the existing presser foot on the sewing machine comprises a pressure lever arranged on the sewing machine and a presser foot fixedly connected to the lower end of the pressure lever. When the sewing machine feeds materials, the presser foot presses on the cloth; when the sewing machine feeds and discharges materials, the presser foot is lifted upwards. In order to facilitate the operation, the existing sewing machine is also provided with a knee rest device for controlling the lifting of the presser foot; during the use, the manual work supports through the knee position and leans on the knee to lean on the dish, and then stirs the mode of control lever and realize lifting of presser foot, and when the sewing work of operation workman high strength, easy people for the maloperation and touching the knee and lean on the dish, make the presser foot lift up automatically when making up, can make the cloth lack sufficient presser foot pressure when sewing like this and cause the confusion of cloth stitch seam, influence the aesthetic measure that whole cloth was made at last.
Chinese patent discloses (publication number: CN 108611770A; bulletin date: 2018-10-02) a presser foot lifting structure of a sewing machine, which comprises an automatic presser foot lifting driving source component, a top post, a knee backrest ejector rod, a rear lever component, a pull rod, a presser foot lifting mechanism and a presser foot component arranged at the lower end of the presser foot lifting mechanism, wherein the rear lever component comprises an automatic presser foot lifting lever and a knee backrest presser foot lifting lever which can swing around the same fixed axis, one end of the top post is connected with one end of the automatic presser foot lifting lever, the other end of the top post is abutted against the moving part of the automatic presser foot lifting driving source component, one end of the knee backrest presser foot lifting lever is hinged with the knee backrest ejector rod, the other end of the knee backrest presser foot lifting lever is hinged with one end of; an avoiding mechanism is arranged between the automatic presser foot lifting lever and the knee presser foot lifting lever, when the knee presser foot lifting lever is driven by the knee ejector rod to swing to lift the knee presser foot, the avoiding mechanism enables the automatic presser foot lifting lever not to swing, and when the automatic presser foot lifting lever is driven by the automatic presser foot lifting drive source component to automatically lift the presser foot, the avoiding mechanism enables the knee presser foot lifting lever to synchronously swing along with the automatic presser foot lifting lever.
In the patent documents, a common knee rest device in the prior art is adopted to control the action of lifting the presser foot; when sewing, artifical external force removes to touch the knee and leans on the dish, and the knee leans on the dish to drive the control lever swing, and the control lever drives axis of rotation and crank handle rotation again, then makes ejector pin upward movement to drive the presser foot and upwards lift up, later the torsional spring that resets, can appear the maloperation and touch the knee and lean on a dish phenomenon like this at the sewing in-process, make the presser foot rise automatically when making up, influence the normal of cloth and make up.
Disclosure of Invention
The invention aims to provide a knee rest device of a sewing machine aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to avoid the influence of the malfunction of the knee rest device on normal sewing.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a sewing machine's knee leans on the device, the knee leans on the device to include the knee and leans on the dish, leans on the control rod that the dish is connected, axis of rotation and sets firmly with the knee rotation axis of rotation epaxial crank, crank handle's one end top is equipped with vertical ejector pin, the control rod with the axis of rotation is connected just the control rod swing can drive the axis of rotation rotates, a serial communication port, the knee leans on the device still including can restricting control rod wobbling driving piece, can detect whether sewing machine is sewing moving detection mechanism and protection switch.
The principle is as follows: the control rod is connected with the rotating shaft and can drive the rotating shaft to rotate through self swinging, the rotating shaft is connected with the rotating crank, the rotating shaft rotates to drive the rotating crank to swing, one end of the rotating crank swings upwards to drive the ejector rod to move upwards, and then the presser foot is driven to lift through the connecting rod mechanism. In the technical scheme, the operating lever is additionally connected with a driving piece, and the driving piece is mainly used for limiting the movement of the operating lever, so that the effect of limiting the lifting of the presser foot is achieved.
When the sewing machine is used, a user can select to turn on the protection switch, then the detection mechanism can start to feed back whether the sewing machine is in normal sewing motion or not, for example, whether a driving motor of the sewing machine rotates or whether a main shaft of the sewing machine rotates or not is detected, if the cloth is sewn by the user through detection and judgment, the electric control signal controls the driving piece to limit the operating rod, so that the user cannot drive the operating rod to move by touching the knee rest disc, and the protection effect of limiting the lifting of the presser foot is achieved; if judge through the detection that the user does not carry out sewing work, the protection effect cancels, and electrical control signal can make the driving piece contact spacing to the control lever, and the user can touch the knee and lean on the dish and drive the control lever this moment and make the presser foot lift.
The structure in this technical scheme prevents effectively that the workman from driving the presser foot and lifting up to the maloperation of control rod when sewing to guaranteed can not lead to the chaotic phenomenon of cloth stitch because of presser foot pressure is not enough, reached the pleasing to the eye effect of the whole stitch seam of cloth.
In the knee rest device of the sewing machine, the driving piece is an electromagnet, a connecting block is fixedly arranged on the rotating shaft, one end of the operating lever is connected with the knee rest disc, the end part of an iron core of the electromagnet is hinged with a connecting rod, and the other end of the operating lever penetrates through the connecting block and is hinged with the end part of the connecting rod; the operating rod is fixedly connected with the connecting block.
When the detection mechanism detects that the user is sewing the cloth, the electric control signal controls the electromagnet to attract, the control lever is pulled by the connecting rod, so that the user cannot swing the control lever by touching the knee rest disc, and the protection effect of limiting the lifting of the presser foot is achieved; if detection mechanism detects not to be in sewing operating condition at present, the protection effect cancels, and electrical control signal can make the electro-magnet be in under the uncharged natural state, and the user can touch the knee and lean on the dish and drive the control lever swing this moment, makes the presser foot lift.
In the knee rest device of the sewing machine, the operating lever is bent, the outer end of the iron core of the electromagnet is provided with a first opening slot, and one end of the connecting rod is inserted into the first opening slot and is connected with the iron core of the electromagnet through a first connecting screw; the other end of the connecting rod is provided with a connector, the connector is provided with a second opening slot, and the end part of the operating rod is inserted into the second opening slot and is connected with the connector through a second connecting screw.
In the knee rest device of the sewing machine, the sewing machine comprises a main shaft and a driving motor for driving the main shaft to rotate, the detection mechanism comprises a sensor arranged on an output shaft of the driving motor, and the sensor and the driving piece are connected with an electric control system of the sewing machine.
The sensor can be centrifugal and is sleeved on the output shaft of the driving motor; or magnetic induction or photoelectric induction, and the like, and the judgment is carried out by combining induction time and induction frequency through corresponding structures such as a protrusion or a magnetic block and the like matched with an output shaft of the driving motor.
In foretell sewing machine's knee is by device, crank handle's middle part is connected in the axis of rotation, still the cover is equipped with reset torsion spring in the axis of rotation, crank handle's one end has the promotion portion, it supports and leans on the recess to have in the promotion portion, the lower extreme of ejector pin can with the bottom of leaning on the recess contacts.
Compared with the prior art, the knee rest device can effectively prevent a worker from lifting the presser foot due to misoperation of the operating lever during sewing, so that the phenomenon of disordered stitches of the cloth caused by insufficient pressure of the presser foot is avoided, and the effect of attractive stitches of the whole cloth is achieved.
Drawings
FIG. 1 is a first perspective view of the present knee rest apparatus.
FIG. 2 is a schematic perspective view of the present knee rest apparatus.
Figure 3 is a schematic diagram of the control structure of the knee rest device.
In the figure, 1, a knee leaning disc; 2. a joystick; 3. a rotating shaft; 4. rotating a crank; 41. a pushing part; 41a, abutting against the groove; 5. a top rod; 6. a drive member; 61. an electromagnet; 61a, an iron core; 61b, a first opening slot; 7. connecting blocks; 8. a connecting rod; 9. a connector; 9a, a second opening slot; 10. a return torsion spring.
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 sewing machine comprises a main shaft and a driving motor for driving the main shaft to rotate, as shown in fig. 1 to 3, the knee leaning device comprises a knee leaning disc 1, an operating rod 2 connected with the knee leaning disc 1, a rotating shaft 3 and a rotating crank 4 fixedly arranged on the rotating shaft 3, a vertical ejector rod 5 is arranged above one end of the rotating crank 4, the operating rod 2 is connected with the rotating shaft 3, the operating rod 2 swings to drive the rotating shaft 3 to rotate, the middle part of the rotating crank 4 is connected onto the rotating shaft 3, a reset torsion spring 10 is further sleeved on the rotating shaft 3, one end of the rotating crank 4 is provided with a pushing part 41, the pushing part 41 is provided with a leaning groove 41a, and the lower end of the ejector rod 5 can be contacted with the bottom of the; the knee rest device further comprises a driving member 6 capable of limiting the swing of the operating lever 2, a detecting mechanism capable of detecting whether the sewing machine is in sewing operation, and a protection switch. Specifically, in this embodiment, the driving member 6 is an electromagnet 61, the rotating shaft 3 is fixedly provided with a connecting block 7, one end of the operating lever 2 is connected with the knee rest 1, an end of an iron core 61a of the electromagnet 61 is hinged with a connecting rod 8, and the other end of the operating lever 2 penetrates through the connecting block 7 and is hinged with an end of the connecting rod 8; the operating rod 2 is fixedly connected with the connecting block 7. The operating rod 2 is bent, the outer end of an iron core 61a of the electromagnet 61 is provided with a first opening slot 61b, and one end of the connecting rod 8 is inserted into the first opening slot 61b and is connected with the iron core 61a of the electromagnet 61 through a first connecting screw; the other end of the connecting rod 8 is provided with a connector 9, the connector 9 is provided with a second opening slot 9a, and the end part of the operating lever 2 is inserted into the second opening slot 9a and is connected with the connector 9 through a second connecting screw; the detection mechanism comprises a sensor arranged on an output shaft of the driving motor, the sensor can be a centrifugal inertial sensor and is sleeved on the output shaft of the driving motor, and the sensor and the driving piece 6 are connected with an electric control system of the sewing machine.
When the sewing machine is used, a user can select to turn on the protection switch, then the detection mechanism can start to detect whether the driving motor works or not, the electric control system judges whether the sewing machine is in normal sewing motion or not, if the user is judged to sew cloth, the electric control signal controls the electromagnet 61 to suck, the control lever 2 is pulled through the connecting rod 8, the user cannot enable the control lever 2 to swing through touching the knee leaning disc 1, and therefore the protection effect of limiting the lifting of the presser foot is achieved; if detection mechanism detects not to be in sewing operating condition at present, the protection effect cancels, and electrical control signal can make electro-magnet 61 be under the uncharged natural state, and the user can touch the knee at this moment and lean on dish 1 to drive the swing of control lever 2, makes the presser foot lift up.
The structure in this embodiment can prevent effectively that the workman from lifting up the presser foot to the maloperation of control rod 2 when sewing to guaranteed can not lead to the chaotic phenomenon of cloth stitch because of presser foot pressure is not enough, reached the pleasing to the eye effect of the whole stitch seam of cloth.
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 (4)
1. The knee rest device of the sewing machine comprises a knee rest disc (1), an operating rod (2) connected with the knee rest disc (1), a rotating shaft (3) and a rotating crank (4) fixedly arranged on the rotating shaft (3), wherein a vertical ejector rod (5) is arranged above one end of the rotating crank (4), the operating rod (2) is connected with the rotating shaft (3), and the operating rod (2) swings to drive the rotating shaft (3) to rotate, and the knee rest device is characterized by further comprising a driving piece (6) capable of limiting the swing of the operating rod (2), a detection mechanism capable of detecting whether the sewing machine is in sewing operation and a protection switch; the driving piece (6) is an electromagnet (61), a connecting block (7) is fixedly arranged on the rotating shaft (3), one end of the operating lever (2) is connected with the knee leaning disc (1), a connecting rod (8) is hinged to the end of an iron core (61a) of the electromagnet (61), and the other end of the operating lever (2) penetrates through the connecting block (7) to be hinged to the end of the connecting rod (8); the operating rod (2) is fixedly connected with the connecting block (7).
2. The knee rest device of a sewing machine according to claim 1, characterized in that the operating lever (2) is bent, the outer end of the iron core (61a) of the electromagnet (61) is provided with a first open slot (61b), one end of the connecting rod (8) is inserted into the first open slot (61b) and is connected with the iron core (61a) of the electromagnet (61) through a first connecting screw; the other end of connecting rod (8) has connector (9), have opening slot two (9a) on connector (9), the tip of control rod (2) is inserted and is established in opening slot two (9a) and through connecting screw two with connector (9) are connected.
3. The knee rest device of a sewing machine according to claim 1 or 2, characterized in that the sewing machine comprises a main shaft and a drive motor for driving the main shaft to rotate, the detection mechanism comprises a sensor arranged on an output shaft of the drive motor, and the sensor and the drive member (6) are connected with an electric control system of the sewing machine.
4. The knee rest device of the sewing machine according to claim 1 or 2, wherein the middle part of the rotating crank (4) is connected to the rotating shaft (3), a return torsion spring (10) is further sleeved on the rotating shaft (3), one end of the rotating crank (4) is provided with a pushing part (41), the pushing part (41) is provided with a supporting groove (41a), and the lower end of the push rod (5) can be in contact with the bottom of the supporting groove (41 a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129719.8A CN109652928B (en) | 2019-02-21 | 2019-02-21 | Knee rest device of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129719.8A CN109652928B (en) | 2019-02-21 | 2019-02-21 | Knee rest device of sewing machine |
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| Publication Number | Publication Date |
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| CN109652928A CN109652928A (en) | 2019-04-19 |
| CN109652928B true CN109652928B (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910129719.8A Active CN109652928B (en) | 2019-02-21 | 2019-02-21 | Knee rest device of sewing machine |
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| CN (1) | CN109652928B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3340836A (en) * | 1965-10-15 | 1967-09-12 | Singer Co | Knee shift mechanisms for sewing machines |
| JP2006149440A (en) * | 2004-11-25 | 2006-06-15 | Juki Corp | Sewing machine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB471594A (en) * | 1936-03-07 | 1937-09-07 | Singer Mfg Co | Presser-lifter actuating device for sewing machines |
| JPH04132586A (en) * | 1990-09-22 | 1992-05-06 | Aisin Seiki Co Ltd | Operating device of walking rate adjusting device of sewing machine |
| WO2012066903A1 (en) * | 2010-11-17 | 2012-05-24 | 株式会社ジャガーインターナショナルコーポレーション | Fabric presser device of a sewing machine |
| ITVR20110110A1 (en) * | 2011-05-20 | 2012-11-21 | Vi Be Mac Spa | PREMISTOFFA DEVICE AND SEWING MACHINE INCLUDING THIS DEVICE |
| JP5993287B2 (en) * | 2012-11-15 | 2016-09-14 | Juki株式会社 | sewing machine |
| KR200472324Y1 (en) * | 2013-05-11 | 2014-04-17 | 정용조 | Knee pad of presser foot for sewing machine |
| CN203741543U (en) * | 2014-03-11 | 2014-07-30 | 浙江美机缝纫机有限公司 | Presser foot lift mechanism for computer controlled lockstitch sewing machine |
| CN205115788U (en) * | 2015-09-19 | 2016-03-30 | 浙江中捷缝纫科技有限公司 | Presser foot mechanism is lifted in sewing machine's knee accuse |
| CN204959251U (en) * | 2015-09-20 | 2016-01-13 | 浙江中捷缝纫科技有限公司 | Presser foot lifting device of sewing machine |
| CN207313874U (en) * | 2017-09-18 | 2018-05-04 | 浙江中捷缝纫科技有限公司 | The presser foot lifter control device of sewing machine |
-
2019
- 2019-02-21 CN CN201910129719.8A patent/CN109652928B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3340836A (en) * | 1965-10-15 | 1967-09-12 | Singer Co | Knee shift mechanisms for sewing machines |
| JP2006149440A (en) * | 2004-11-25 | 2006-06-15 | Juki Corp | Sewing machine |
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| CN109652928A (en) | 2019-04-19 |
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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: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |
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