CN108611770B - Sewing machine lifts presser foot structure and sewing machine - Google Patents
Sewing machine lifts presser foot structure and sewing machine Download PDFInfo
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- CN108611770B CN108611770B CN201810558315.6A CN201810558315A CN108611770B CN 108611770 B CN108611770 B CN 108611770B CN 201810558315 A CN201810558315 A CN 201810558315A CN 108611770 B CN108611770 B CN 108611770B
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- 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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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a presser foot lifting structure of a sewing machine, which comprises an automatic presser foot lifting driving source component, a jacking column, a knee backrest ejector rod, a rear lever component, a pull rod, a presser foot lifting mechanism and a presser foot component, 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, an avoiding mechanism is arranged between the automatic presser foot lifting lever and the knee backrest presser foot lifting lever, when the knee backrest ejector rod drives the knee backrest presser foot lifting lever to swing to lift the presser foot, the avoiding mechanism enables the automatic presser foot lifting lever not to swing, and when the automatic presser foot lifting driving source component drives the automatic presser foot lifting lever to lift the presser foot automatically, the avoiding mechanism enables the knee backrest presser foot lifting lever to swing synchronously along with the automatic presser foot lifting lever. This application can make the knee by lifting the automatic presser foot lever not swing when lifting the presser foot through dodging the mechanism for the fore-set also does not swing, so the knee is by lifting the presser foot when fore-set and sewing machine casing can not interfere, collide, and then make this application have sufficient knee by lifting the presser foot height.
Description
Technical Field
The invention relates to a presser foot lifting structure of a sewing machine.
The invention also relates to a sewing machine comprising the presser foot lifting structure of the sewing machine.
Background
The presser foot lifting structure of the sewing machine in the prior art is shown in fig. 1, and comprises a presser foot lifting electromagnet assembly 100, a top pillar 200, a knee rest top rod 300, a rear lever 500 hinged to a machine shell through a screw 400, a pull rod 600, a presser foot lifting mechanism 700, and a presser foot assembly 800 mounted at the lower end of the presser foot lifting mechanism 700, wherein the presser foot lifting electromagnet assembly 100 is mounted on the machine shell, one end of the top pillar 200 is contacted with the moving end of the presser foot lifting electromagnet assembly 100, the other end of the top pillar is mounted at one end of the rear lever 500, the upper end of the knee rest top rod 300 is hinged to the rear lever 500, the other end of the rear lever 500 is hinged to the other end of the pull rod 600, and the. The working principle of the presser foot lifting structure of the sewing machine is as follows: when the presser foot is automatically lifted, the moving end of the presser foot lifting electromagnet assembly 100 extends upwards, the rear lever 500 is driven by the top post 200 to swing around the screw 400, and the presser foot assembly 800 is driven to move upwards by the pull rod 600 and the presser foot lifting mechanism 700, so that the automatic presser foot lifting is realized; when the presser foot is lifted by the artificial knee, a user upwards props up the knee through the knee to extend the presser foot jacking rod 300, the rear lever 500 is driven to swing around the screw 400, and then the presser foot assembly 800 is driven to move upwards through the pull rod 600 and the presser foot lifting mechanism 700, so that the presser foot is lifted by the knee.
When the presser foot lifting structure of the sewing machine works, the swinging of the rear lever 500 can drive the knee rest ejector rod 300 to move upwards simultaneously when the presser foot is lifted automatically, and the swinging of the rear lever 500 can drive the ejector post 200 to move upwards simultaneously when the presser foot is lifted manually. However, due to the limitation of the internal structure of the needle feeder type in the sewing machine, the sewing machine adopts an electromagnet semi-external structure, so that if the presser foot is lifted manually and the height is too high, the stroke of the upward movement of the top pillar 200 is increased, and the top pillar 200 and the machine shell generate interference and collision; in order to avoid interference and collision between the top pillar 200 and the machine shell, the height of the presser foot lifted when the presser foot is lifted manually can only be reduced, and further the height of the presser foot lifted by the knee rest is insufficient. The highest height requirement of the knee rest of the sewing industry standard presser foot lifting structure reaches 13mm, and the highest height of the knee rest of the presser foot lifting structure of the sewing machine with the structure cannot reach 13mm at all.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a presser foot lifting structure of a sewing machine, which can ensure that the maximum height of a knee rest for lifting a presser foot meets requirements, and can avoid interference and collision between a top pillar and a machine shell when the knee rest lifts the presser foot.
In order to achieve the purpose, the invention provides a presser foot lifting structure of a sewing machine, which comprises an automatic presser foot lifting drive source component, a jacking column, 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 jacking column is connected with one end of the automatic presser foot lifting lever, the other end of the jacking column is abutted against the moving part of the automatic presser foot lifting drive 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 the pull; an avoiding mechanism is arranged between the automatic presser foot lifting lever and the knee rest presser foot lifting lever, when the knee rest ejector rod drives the knee rest presser foot lifting lever to swing to lift the knee rest presser foot, the avoiding mechanism enables the automatic presser foot lifting lever not to swing, and when the automatic presser foot lifting driving source assembly drives the automatic presser foot lifting lever to automatically lift the presser foot, the avoiding mechanism enables the knee rest presser foot lifting lever to synchronously swing along with the automatic presser foot lifting lever.
Furthermore, the swinging direction of the knee pressure foot lifting lever when the knee pressure foot is lifted is the same as the swinging direction of the automatic pressure foot lifting lever when the knee pressure foot is lifted automatically; the avoidance mechanism comprises a bending part extending from the automatic presser foot lifting lever, a cavity area formed on the inner peripheral side of the bending part, and a swing rod part arranged on the knee presser foot lifting lever; the bending part is arranged on the right side of the swing rod part, the bending part is provided with an avoidance opening part on the left side of the cavity area, a driving swing part is arranged on the right side of the cavity area, and the swing rod part is located in the cavity area, the avoidance opening part and the left side of the driving swing part.
Furthermore, the swinging direction of the knee pressure foot lifting lever when the knee pressure foot is lifted is the same as the swinging direction of the automatic pressure foot lifting lever when the knee pressure foot is lifted automatically; the avoidance mechanism comprises a bending part extending from the knee to the presser foot lifting lever, a cavity area formed on the inner peripheral side of the bending part, and a swing rod part arranged on the automatic presser foot lifting lever; the bending part is arranged on the left side of the swing rod part, the bending part is provided with an avoidance opening part on the right side of the cavity area, a driving swing part is arranged on the left side of the cavity area, and the swing rod part is located in the cavity area, the avoidance opening part and the right side of the driving swing part.
Further, the knee rest presser foot lifting lever is hinged with the knee rest ejector rod through a hinge mechanism, and when the automatic presser foot lifting lever is driven by the automatic presser foot lifting driving source component to automatically lift the presser foot, the hinge mechanism enables the knee rest ejector rod not to move along with the swinging of the knee rest presser foot lifting lever.
Furthermore, the hinge mechanism comprises a push rod screw for hinging the knee rest push rod with the knee rest presser foot lifting lever and a sliding groove which is arranged on the knee rest presser foot lifting lever and extends up and down, and the push rod screw is arranged in the sliding groove in a penetrating way and can move up and down relative to the sliding groove; when the presser foot is not lifted by the knee and the presser foot is automatically lifted, the ejector rod screw is positioned at the upper end of the sliding groove.
Furthermore, the upper end of the knee backrest ejector rod is integrally provided with a cylindrical connecting part and a limiting part arranged at the outer end of the cylindrical connecting part, the knee backrest pressure foot lifting lever is provided with a round hole part matched with the cylindrical connecting part, the cylindrical connecting part is rotatably arranged in the round hole part in a penetrating mode, and the limiting part is located outside the round hole part and is abutted to the knee backrest pressure foot lifting lever.
Furthermore, an elastic buffer pad is fixedly arranged on the end face of the driving swinging part facing the swinging rod part.
Furthermore, a rubber ring is sleeved on the driving swing part, and a part of the rubber ring between the driving swing part and the swing rod part forms the elastic cushion pad.
Furthermore, the automatic presser foot lifting lever and the knee rest presser foot lifting lever are coaxially hinged to a shell of the sewing machine through an axial screw.
Furthermore, the top pillar is sleeved with a rotatable roller, and the roller is abutted to a moving part at the upper end of the automatic presser foot lifting driving source assembly.
Furthermore, the presser foot lifting mechanism comprises a front lever with a fixed swing fulcrum, a pressure rod capable of moving up and down, a pressure rod guide frame fixed at the upper end of the pressure rod, and a lifting connecting plate connected with the pressure rod guide frame through a pin, wherein one end of the front lever is hinged with the pressure rod, the other end of the front lever is hinged with the upper end of the lifting connecting plate, the lower end of the lifting connecting plate is provided with a connecting groove extending up and down, the pin is arranged in the connecting groove in a penetrating manner and located at the lower end of the connecting groove, and the presser foot assembly is installed at.
The invention also provides a sewing machine, wherein the sewing machine is provided with the presser foot lifting structure.
As described above, the sewing machine presser foot lifting structure and the sewing machine according to the present invention have the following advantages:
in this application, can make the knee by lifting the automatic presser foot lever not swing when the presser foot through dodging the mechanism for the fore-set also does not swing, so the phenomenon that fore-set and sewing machine casing interfere, collide can not appear when the knee is by lifting the presser foot, and then make this application have sufficient knee and lean on lifting the presser foot height, can guarantee that the knee is by lifting the highest height of presser foot and reaching 13mm, satisfy the requirement.
Drawings
Fig. 1 is a schematic structural view of a presser foot lifting structure of a sewing machine in the prior art.
Fig. 2 is a schematic view of the structure of the sewing machine of the present application.
Fig. 3 is a schematic structural view of a presser foot lifting structure of the sewing machine in the present application.
FIG. 4 is a schematic structural view of an embodiment of the rear lever assembly of the present application.
Fig. 5 is an exploded view of fig. 4.
FIG. 6 is a schematic structural view of another embodiment of a rear lever assembly of the present application.
Fig. 7 is an exploded view of fig. 6.
FIG. 8 is a schematic view of the connection of the knee lift pin and the knee pressure foot lift lever according to an embodiment of the present application.
Fig. 9 is an exploded view of fig. 8.
FIG. 10 is a schematic view of the connection of a knee lift pin and a knee pressure foot lever in another embodiment of the present application.
Fig. 11 is a schematic structural view of a presser foot lift mechanism in the present application.
Fig. 12 is an enlarged view of circle a of fig. 11.
Description of the element reference numerals
1 automatic presser foot lifting driving source component
2 top column
3 knee backrest mandril
31 cylindrical connecting part
32 position limiting part
4 rear lever assembly
41 automatic lifting presser foot lever
42 knee is leaned on and is lifted presser foot lever
421 sliding groove
422 round hole part
43 bent part
44 hollow cavity region
45 swing link part
46 avoiding opening part
47 drive the oscillating part
5 draw bar
6 presser foot hoist mechanism
61 front lever
62 pressure bar
63 pressure bar guide frame
64 pin
65 lifting connection board
651 connecting groove
66 pressure bar sleeve
7 presser foot subassembly
8 ejector pin screw
9 rubber ring
10-axis screw
11 roller
12 casing
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.
In the following embodiments, the cloth feeding direction of the cloth feeding mechanism of the sewing machine is defined as a forward direction, the direction of the sewing machine toward the head is defined as a right direction, and the direction of the sewing machine toward the tail is defined as a left direction.
The invention provides a sewing machine, in particular to a presser foot lifting structure of a sewing machine arranged in the sewing machine. As shown in fig. 2 and 3, the presser foot lifting structure of the sewing machine is installed in a machine shell 12 of the sewing machine, and comprises an automatic presser foot lifting drive source assembly 1, a top pillar 2 extending forwards and backwards, a knee ejector rod 3 extending up and down, a rear lever assembly 4, a pull rod 5 extending left and right, a presser foot lifting mechanism 6, and a presser foot assembly 7 installed at the lower end of the presser foot lifting mechanism 6, wherein the automatic presser foot lifting drive source assembly 1, the top pillar 2 and the rear lever assembly 4 are arranged at the tail of the machine shell 12, the presser foot lifting mechanism 6 is arranged at the head of the machine shell 12, and the upper end of the knee ejector rod 3 extends into the machine shell 12 and is connected with the rear lever assembly 4. The automatic presser foot lifting driving source component 1 can be an electromagnet component, an air cylinder and the like, is fixed on the machine shell 12 through screws, and is provided with a moving part at the upper end thereof, wherein the moving part can move up and down. The rear lever component 4 comprises an automatic presser foot lifting lever 41 and a knee rest presser foot lifting lever 42, the automatic presser foot lifting lever 41 and the knee rest presser foot lifting lever 42 are coaxially hinged to the shell 12 of the sewing machine through a shaft position screw 10 extending forwards and backwards, so that the automatic presser foot lifting lever 41 and the knee rest presser foot lifting lever 42 can swing around the same fixed axis extending forwards and backwards; the rear end of the top pillar 2 penetrates through the left end of the automatic presser foot lifting lever 41 and is fixedly connected with the automatic presser foot lifting lever 41 through a nut, the front end of the top pillar 2 is abutted against the moving part at the upper end of the automatic presser foot lifting driving source component 1, and the top pillar 2 is positioned above the moving part; one end of the knee rest presser foot lifting lever 42 is hinged with the knee rest ejector rod 3, the other end of the knee rest presser foot lifting lever is hinged with the left end of the pull rod 5, and the right end of the pull rod 5 is connected with the upper end of the presser foot lifting mechanism 6. In particular, an avoiding mechanism is arranged between the automatic presser foot lifting lever 41 and the knee rest presser foot lifting lever 42, and the avoiding mechanism can enable the automatic presser foot lifting lever 41 and the knee rest presser foot lifting lever 42 to have the following motion relation: 1. when the knee backrest push rod 3 drives the knee backrest presser foot lifting lever 42 to swing to lift the knee backrest presser foot, the knee backrest presser foot lifting lever 42 is driven to swing around a fixed axis by the upward movement of the knee backrest push rod 3, and the presser foot component 7 is driven to move upward by the pull rod 5 and the presser foot lifting mechanism 6, so that the knee backrest presser foot lifting is realized; at this moment, the avoidance mechanism enables the automatic presser foot lifting lever 41 not to swing, so that the top pillar 2 connected with the automatic presser foot lifting lever 41 does not swing, so that the phenomenon that the top pillar 2 interferes and collides with the sewing machine shell 12 cannot occur when the knee is lifted by the presser foot, and further the knee is enabled to have enough knee height to lift the presser foot, and the maximum height of the knee by lifting the presser foot can be ensured to reach 13mm and meet the requirements. 2. When the automatic presser foot lifting driving source component 1 drives the automatic presser foot lifting lever 41 to automatically lift the presser foot, the jacking column 2 is driven to move upwards through the upward movement of the moving part at the upper end of the automatic presser foot lifting driving source component 1, so that the automatic presser foot lifting lever 41 is driven to swing around a fixed axis, at the moment, the avoidance mechanism enables the knee rest presser foot lifting lever 42 to synchronously swing along with the automatic presser foot lifting lever 41, the knee rest presser foot lifting lever 42 drives the pull rod 5 to move, and the presser foot component 7 is driven to move upwards through the presser foot lifting mechanism 6, so that the automatic presser foot lifting is realized.
In the present application, the swing direction of the knee presser lifting lever 42 when the knee presser is lifted is the same as the swing direction of the automatic presser lifting lever 41 when the knee presser is lifted automatically, and both swing leftward in the direction toward the tail. The avoidance mechanism has the following two preferred embodiments:
as shown in fig. 3 to 5, the avoidance mechanism includes a bending portion 43 extending from the right side of the automatic presser foot lifting lever 41, a cavity area 44 formed on the inner peripheral side of the bending portion 43, and a swing rod portion 45 provided on the knee presser foot lifting lever 42; the bending part 43 is arranged at the right side of the swing rod part 45 along the swing direction of the left swing of the knee pressure foot lifting lever 42 when the knee is lifted, the bending part 43 is approximately concave, so that the bending part 43 is provided with an avoiding opening part 46 at the left side of the cavity area 44, a driving swing part 47 is arranged at the right side of the cavity area 44, and the swing rod part 45 is positioned in the cavity area 44 and the avoiding opening part 46 and at the left side of the driving swing part 47. When the knee is lifted, the knee top rod 3 moves upwards to drive the knee lifting presser foot lever 42 to swing leftwards, the swing rod part 45 on the knee lifting presser foot lever 42 swings leftwards in the direction away from the driving swing part 47 on the automatic presser foot lifting lever 41 in the cavity area 44 and the avoidance opening part 46, so that the swing rod part 45 is not abutted with the driving swing part 47, the automatic presser foot lifting lever 41 and related parts installed on the automatic presser foot lifting lever 41 do not swing, the knee lifting presser foot lever 42 drives the pull rod 5 to move leftwards, and the presser foot component 7 is driven to move upwards through the presser foot lifting mechanism 6, so that the knee lifting presser foot is realized. When the presser foot is automatically lifted, the moving part at the upper end of the automatic presser foot lifting driving source component 1 extends upwards, the automatic presser foot lifting lever 41 is driven by the jacking column 2 to swing leftwards, the driving swing part 47 on the automatic presser foot lifting lever 41 swings leftwards together, the driving swing part 47 on the automatic presser foot lifting lever 41 is abutted with the swing rod part 45 on the knee pressure lifting lever 42, so that the automatic presser foot lifting lever 41 can drive the knee pressure lifting lever 42 to swing leftwards together, the knee pressure lifting lever 42 drives the pull rod 5 to move leftwards, and the presser foot component 7 is driven to move upwards by the presser foot lifting mechanism 6, thereby realizing automatic presser foot lifting.
As shown in fig. 6 to 7, the second preferred embodiment of the avoidance mechanism includes a bent portion 43 extending from the left side of the knee presser lifting lever 42, a hollow cavity region 44 formed on the inner peripheral side of the bent portion 43, and a swing rod portion 45 provided on the automatic presser lifting lever 41; along the swinging direction of the knee pressure lifting foot lever 42 swinging leftwards when the knee pressure is lifted, the bending part 43 is arranged on the left side of the swing rod part 45, the bending part 43 is provided with an avoiding opening part 46 on the right side of the cavity area 44, a driving swinging part 47 is arranged on the left side of the cavity area 44, and the swing rod part 45 is positioned in the cavity area 44 and the avoiding opening part 46 and on the right side of the driving swinging part 47. When the knee is lifted by the presser foot, the knee top rod 3 moves upwards to drive the knee to lift the presser foot lever 42 to swing leftwards, the driving swing part 47 on the knee lifting presser foot lever 42 swings leftwards in the direction away from the swing rod part 45 on the automatic presser foot lifting lever 41, so that the swing rod part 45 is not abutted with the driving swing part 47, the automatic presser foot lifting lever 41 and related parts installed on the automatic presser foot lifting lever 41 do not swing, the knee is lifted by the presser foot lifting lever 42 to drive the pull rod 5 to move leftwards, and the presser foot component 7 is driven by the presser foot lifting mechanism 6 to move upwards, so that the knee is lifted by the presser foot. When the presser foot is automatically lifted, the moving part at the upper end of the presser foot automatic lifting driving source component 1 extends upwards, the automatic presser foot lifting lever 41 is driven by the jacking column 2 to swing leftwards, the swing rod part 45 on the presser foot automatic lifting lever 41 swings leftwards together, the swing rod part 45 on the presser foot automatic lifting lever 41 is abutted with the driving swing part 47 on the presser foot lifting lever 42, so that the presser foot automatic lifting lever 41 drives the knee to swing leftwards together with the presser foot lifting lever 42, the knee is lifted by the presser foot lifting lever 42 to drive the pull rod 5 to move leftwards, and the presser foot component 7 is driven to move upwards by the presser foot lifting mechanism 6, so that the automatic presser foot lifting.
In the first and second embodiments of the avoiding mechanism, as shown in fig. 5 to 7, an elastic buffer pad is fixedly arranged on the end surface of the driving swing portion 47 facing the swing rod portion 45, and when the automatic presser foot lifting lever 41 drives the knee to swing leftwards along with the presser foot lifting lever 42, the driving swing portion 47 and the swing rod portion 45 are in abutting relation, the elastic buffer pad can buffer, so that the driving swing portion 47 is prevented from directly contacting the swing rod portion 45, and noise and vibration when the presser foot lifting structure of the sewing machine automatically lifts the presser foot are effectively reduced. The elastic buffer cushion comprises the following structural components: the rubber ring 9 is sleeved on the driving swing part 47, and a part of the rubber ring 9 between the driving swing part 47 and the swing rod part 45 forms the elastic buffer pad. Meanwhile, in the first and second embodiments of the avoidance mechanism, the bent portion 43 may be provided in various shapes, and the cavity region 44 formed on the inner peripheral side of the bent portion 43 may be in a U shape, an L shape, or other shapes according to the different shapes of the bent portion 43.
In addition, the hinge structure between the knee top rod 3 and the knee lifting and pressing foot lever 42 has three preferred embodiments: in the first embodiment, as shown in fig. 3, the knee top bar 3 is hinged to the knee lifting and pressing lever 42 by a screw extending forward and backward. In the second embodiment, as shown in fig. 8 and 9, the knee lift presser foot lever 42 and the knee lift push rod 3 are hinged by the hinge mechanism, and when the automatic presser foot lift driving source assembly 1 drives the automatic presser foot lift lever 41 to automatically lift the presser foot, the hinge mechanism can move the knee lift push rod 3 upward without the swing of the knee lift presser foot lever 42, so that the second embodiment is a preferable configuration. The hinge mechanism may adopt the following structure: the hinge mechanism comprises a push rod screw 8 for hinging the knee rest push rod 3 with the knee rest presser foot lifting lever 42 and a sliding groove 421 which is arranged on the knee rest presser foot lifting lever 42 and extends up and down, wherein the push rod screw 8 extends back and forth, penetrates through the sliding groove 421 and can move up and down relative to the sliding groove 421; in the initial state, when the presser foot is not lifted by the knee or automatically lifted, the ejector bolt 8 is positioned at the upper end of the chute 421. Therefore, when the knee is used for lifting the presser foot, the knee ejector rod 3 moves upwards, and the ejector rod screw 8 is abutted against the groove wall at the upper end of the sliding groove 421, so that the knee ejector rod 3 drives the knee lifting presser foot lever 42 to swing leftwards, and the knee lifting presser foot is realized; when the presser foot is automatically lifted, the automatic presser foot lifting lever 41 drives the knee presser foot lifting lever 42 to swing leftward together with the avoidance mechanism, but the slide groove 421 on the knee presser foot lifting lever 42 moves upward relative to the ejector screw 8, so the position of the ejector screw 8 is not changed, and the knee ejector 3 does not move upward with the swing of the knee presser foot lifting lever 42 when the automatic presser foot lifting operation is performed. In the third embodiment, as shown in fig. 10, the upper end of the knee top rod 3 is integrally provided with a cylindrical connecting part 31 extending forward and a limiting part 32 arranged at the front end of the cylindrical connecting part 31, the knee lifting and pressing lever 42 is provided with a circular hole part 422 matching with the cylindrical connecting part 31, the cylindrical connecting part 31 is rotatably inserted into the circular hole part 422, the limiting part 32 is located outside (i.e. on the front side) the circular hole part 422 and abuts against the knee lifting and pressing lever 42, the limiting part 32 is in a flat plate-shaped structure, and the length is greater than the diameter of the circular hole part 422, so that the limiting part 32 can limit the cylindrical connecting part 31 from being pulled out of the circular hole part 422; during installation, the lower end of the knee top rod 3 is inserted into the round hole part 422, so that the knee top rod 3 and the knee lifting presser foot lever 42 can be hinged.
As shown in fig. 3 to 5, the top pillar 2 is sleeved with a rotatable roller 11, the roller 11 is abutted against a moving part at the upper end of the automatic pressure foot lifting driving source assembly 1, and the roller 11 is axially limited by a retainer ring fixed on the top pillar 2.
The preferable structure of the presser foot lifting mechanism 6 is: as shown in fig. 11 and 12, the presser foot lift mechanism 6 includes a front lever 61 having a fixed swing fulcrum, a presser bar 62 movable up and down, a presser bar guide 63 fixed to an upper end of the presser bar 62 and having a projection, and a lift link plate 65 connected to the projection of the presser bar guide 63 by a pin 64; the front lever 61 is hinged to the case 12 by a pin extending forward and backward; the pressure lever 62 can be vertically moved and is arranged in a pressure lever sleeve 66 in a penetrating way, and the pressure lever sleeve 66 is fixed on the machine shell 12; the upper end of the front lever 61 is hinged with the right end of the pull rod 5, and the lower end of the front lever 61 is hinged with the upper end of the lifting connecting plate 65; the lower end of the lifting connecting plate 65 is provided with a connecting groove 651 extending up and down, and the pin 64 penetrates through the connecting groove 651 and is positioned at the lower end of the connecting groove 651; the presser foot assembly 7 is mounted to the lower end of the presser bar 62. When the presser foot is lifted by the knee or automatically, the presser foot lifting lever 42 swings leftwards, the front lever 61 swings leftwards under the driving of the pull rod 5, the lifting connecting plate 65 is further driven to move upwards, and the lower end groove wall of the connecting groove 651 in the lifting connecting plate 65 is abutted to the pin 64, so that the lifting connecting plate 65 drives the pressing rod guide frame 63, the pressing rod 62 and the presser foot component 7 to move upwards together through the pin 64, and the presser foot is lifted by the knee or automatically.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a sewing machine lifts presser foot structure, includes that automatic presser foot drive source subassembly (1), fore-set (2), knee are leaned on ejector pin (3), back lever assembly (4), pull rod (5), presser foot hoist mechanism (6) and install presser foot subassembly (7) at presser foot hoist mechanism (6) lower extreme, its characterized in that: the rear lever component (4) comprises an automatic presser foot lifting lever (41) and a knee rest presser foot lifting lever (42) which can swing around the same fixed axis, one end of the ejection column (2) is connected with one end of the automatic presser foot lifting lever (41), the other end of the ejection column is abutted against the moving part of the automatic presser foot lifting driving source component (1), one end of the knee rest presser foot lifting lever (42) is hinged with the knee rest ejection rod (3), the other end of the knee rest presser foot lifting lever is hinged with one end of a pull rod (5), and the other end of the pull rod (5) is connected with the upper end of a presser foot lifting mechanism (6); an avoidance mechanism is arranged between the automatic presser foot lifting lever (41) and the knee rest presser foot lifting lever (42), when the knee rest ejector rod (3) drives the knee rest presser foot lifting lever (42) to swing to lift the presser foot by the knee rest, the avoidance mechanism enables the automatic presser foot lifting lever (41) not to swing, and when the automatic presser foot lifting driving source component (1) drives the automatic presser foot lifting lever (41) to automatically lift the presser foot, the avoidance mechanism enables the knee rest presser foot lifting lever (42) to synchronously swing along with the automatic presser foot lifting lever (41);
the swinging direction of the knee pressure foot lifting lever (42) when the knee pressure foot is lifted is the same as the swinging direction of the automatic pressure foot lifting lever (41) when the pressure foot is automatically lifted; the avoidance mechanism comprises a bending part (43), a cavity area (44) formed on the inner peripheral side of the bending part (43) and a swing rod part (45), and the bending part (43) and the swing rod part (45) are respectively arranged on the automatic presser foot lifting lever (41) and the knee-rest presser foot lifting lever (42);
when the bending part (43) is arranged on the automatic presser foot lifting lever (41) and the swing rod part (45) is arranged on the knee presser foot lifting lever (42), the bending part (43) is arranged on the right side of the swing rod part (45) along the swinging direction of the knee presser foot lifting lever (42) swinging leftwards when the knee is lifted, the bending part (43) is provided with an avoiding opening part (46) on the left side of the cavity area (44), the right side of the cavity area (44) is provided with a driving swinging part (47), and the swing rod part (45) is positioned in the cavity area (44) and the avoiding opening part (46) and on the left side of the driving swinging part (47);
when the bending part (43) is arranged on the knee lifting presser foot lever (42) and the swing rod part (45) is arranged on the automatic presser foot lifting lever (41), the bending part (43) is arranged on the left side of the swing rod part (45) along the swinging direction of the knee lifting presser foot lever (42) swinging leftwards when the knee is lifted, the bending part (43) is provided with an avoiding opening part (46) on the right side of the cavity area (44), the left side of the cavity area (44) is provided with a driving swinging part (47), and the swing rod part (45) is positioned in the cavity area (44) and the avoiding opening part (46) and is positioned on the right side of the driving swinging part (47).
2. The presser foot lifting structure of a sewing machine according to claim 1, wherein: the knee rest presser foot lifting lever (42) is hinged with the knee rest ejector rod (3) through a hinge mechanism, and when the automatic presser foot lifting driving source component (1) drives the automatic presser foot lifting lever (41) to automatically lift the presser foot, the hinge mechanism enables the knee rest ejector rod (3) not to move along with the swinging of the knee rest presser foot lifting lever (42).
3. The presser foot lifting structure of a sewing machine according to claim 2, wherein: the hinge mechanism comprises a push rod screw (8) for hinging the knee rest push rod (3) with the knee rest presser foot lifting lever (42) and a sliding groove (421) which is arranged on the knee rest presser foot lifting lever (42) and extends up and down, and the push rod screw (8) is arranged in the sliding groove (421) in a penetrating way and can move up and down relative to the sliding groove (421); when the presser foot is not lifted by the knee and the presser foot is automatically lifted, the mandril screw (8) is positioned at the upper end of the sliding groove (421).
4. The presser foot lifting structure of a sewing machine according to claim 1, wherein: the knee is by the upper end of ejector pin (3) and is equipped with cylinder connecting portion (31) and establishes spacing portion (32) in cylinder connecting portion (31) outer end integratively, knee is by lifting and is seted up on presser foot lever (42) with cylinder connecting portion (31) matched with round hole portion (422), cylinder connecting portion (31) rotationally wear to establish in round hole portion (422), spacing portion (32) are located the outside of round hole portion (422) and are leaned on with the knee and lift presser foot lever (42) butt.
5. The presser foot lifting structure of a sewing machine according to claim 1, wherein: an elastic buffer pad is fixedly arranged on the end face, facing the swing rod part (45), of the driving swing part (47).
6. The sewing machine presser foot lifting structure according to claim 5, wherein: the rubber ring (9) is sleeved on the driving swing part (47), and a part of the rubber ring (9) between the driving swing part (47) and the swing rod part (45) forms the elastic buffer pad.
7. The presser foot lifting structure of a sewing machine according to claim 1, wherein: the automatic presser foot lifting lever (41) and the knee rest presser foot lifting lever (42) are coaxially hinged to a shell (12) of the sewing machine through an axial screw (10).
8. The presser foot lifting structure of a sewing machine according to claim 1, wherein: the top pillar (2) is sleeved with a rotatable roller (11), and the roller (11) is abutted to a moving part at the upper end of the automatic presser foot lifting driving source component (1).
9. The presser foot lifting structure of a sewing machine according to claim 1, wherein: the presser foot lifting mechanism (6) comprises a front lever (61) with a fixed swing fulcrum, a pressing rod (62) capable of moving up and down, a pressing rod guide frame (63) fixed at the upper end of the pressing rod (62), and a lifting connecting plate (65) connected with the pressing rod guide frame (63) through a pin (64), one end of the front lever (61) is hinged with the pull rod (5), the other end of the front lever is hinged with the upper end of the lifting connecting plate (65), a connecting groove (651) extending up and down is formed in the lower end of the lifting connecting plate (65), the pin (64) penetrates through the connecting groove (651) and is located at the lower end of the connecting groove (651), and the presser foot assembly (7) is installed at the lower end of the pressing rod (62.
10. A sewing machine characterized by: a presser foot lifting structure of a sewing machine according to any one of claims 1 to 9 is installed in the sewing machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810558315.6A CN108611770B (en) | 2018-06-01 | 2018-06-01 | Sewing machine lifts presser foot structure and sewing machine |
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| CN201810558315.6A CN108611770B (en) | 2018-06-01 | 2018-06-01 | Sewing machine lifts presser foot structure and sewing machine |
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| CN108611770A CN108611770A (en) | 2018-10-02 |
| CN108611770B true CN108611770B (en) | 2020-08-18 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112626726B (en) * | 2019-09-24 | 2022-07-05 | 杰克科技股份有限公司 | Feed lifting height adjusting mechanism and sewing machine |
| CN110904576A (en) * | 2019-12-30 | 2020-03-24 | 浙江美机缝纫机有限公司 | Presser foot lifting device of sewing machine |
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| CN203144677U (en) * | 2013-03-20 | 2013-08-21 | 新杰克缝纫机股份有限公司 | Presser foot mechanism |
| CN204000196U (en) * | 2014-07-29 | 2014-12-10 | 浙江宝石机电股份有限公司 | A kind of presser foot lifting device of Sewing machines |
| CN204919000U (en) * | 2015-10-28 | 2015-12-30 | 浙江美机缝纫机有限公司 | Sewing machine lifts presser foot device |
| CN206109689U (en) * | 2016-09-30 | 2017-04-19 | 浙江中捷缝纫科技有限公司 | Presser foot lifting mechanism of sewing machine |
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| CN207143456U (en) * | 2017-09-12 | 2018-03-27 | 杰克缝纫机股份有限公司 | Foot lifting mechanism and sewing machine |
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| US4246856A (en) * | 1979-07-13 | 1981-01-27 | The Singer Company | Presser foot lift operable independently by manual or power devices |
| CN203144677U (en) * | 2013-03-20 | 2013-08-21 | 新杰克缝纫机股份有限公司 | Presser foot mechanism |
| CN204000196U (en) * | 2014-07-29 | 2014-12-10 | 浙江宝石机电股份有限公司 | A kind of presser foot lifting device of Sewing machines |
| CN204919000U (en) * | 2015-10-28 | 2015-12-30 | 浙江美机缝纫机有限公司 | Sewing machine lifts presser foot device |
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| CN108611770A (en) | 2018-10-02 |
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Address after: 318010 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. |