CN215757905U - Lift presser foot and thread loosening mechanism and sewing machine - Google Patents
Lift presser foot and thread loosening mechanism and sewing machine Download PDFInfo
- Publication number
- CN215757905U CN215757905U CN202121367916.2U CN202121367916U CN215757905U CN 215757905 U CN215757905 U CN 215757905U CN 202121367916 U CN202121367916 U CN 202121367916U CN 215757905 U CN215757905 U CN 215757905U
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- presser foot
- foot lifting
- plate
- thread
- drive plate
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- 230000007246 mechanism Effects 0.000 title claims abstract description 27
- 238000009958 sewing Methods 0.000 title claims abstract description 22
- 230000009471 action Effects 0.000 claims description 9
- 230000003578 releasing effect Effects 0.000 abstract description 23
- 238000000465 moulding Methods 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of sewing machines, in particular to a presser foot lifting and loosening mechanism and a sewing machine. A presser foot lifting and thread releasing mechanism of a sewing machine is arranged at the head of a frame and comprises: the presser foot lifting lever is hinged on the rack and used for lifting the presser foot; the wire releasing plate is used for pushing the wire clamping device to perform a wire releasing action; the presser foot lifting drive plate is used for driving the presser foot lifting lever; the driving motor is used for driving the driving cam, and the driving cam pushes the presser foot lifting driving plate and the thread loosening plate to move; one end of the presser foot lifting drive plate is hinged and linked with one end of the thread loosening plate, and a certain distance is reserved between the other end of the presser foot lifting drive plate and the presser foot lifting lever; under the drive of the drive cam, the other end of the presser foot lifting drive plate rotates for a certain angle towards the presser foot lifting lever, and then contacts and drives the presser foot lifting lever. The utility model solves the problems of inconvenient use and inflexible use caused by integral molding of the original design and influence on the working efficiency.
Description
Technical Field
The utility model relates to the technical field of sewing machines, in particular to a presser foot lifting and loosening mechanism and a sewing machine.
Background
The existing sewing machine is generally provided with a thread clamping device. The thread clamping device has the advantages that when the sewing machine works, the thread clamping device clamps a thread, so that the thread has proper tightness; when the sewing is finished and the thread is automatically cut, the thread clamping device cannot be automatically loosened, and the thread loosening device is required to be arranged to control the automatic loosening of the thread clamping device.
The sewing machine is also provided with a presser foot device. The presser foot is arranged above the sewing material when the sewing machine works, and the action of lifting the presser foot is driven by the presser foot lifting device.
Chinese utility model 2019102043358 discloses a sewing machine and lift presser foot thread loosening mechanism, wherein lift presser foot lever and thread loosening board and be integrated into one piece. When the thread releasing device is used, thread releasing and presser foot lifting are necessarily carried out simultaneously, inconvenience in the daily use process can be caused, thread releasing can not be independently carried out, the use is not flexible and convenient, and the working efficiency of the sewing machine is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a presser foot lifting and loosening mechanism and a sewing machine.
The purpose of the utility model is realized as follows:
a presser foot lifting and thread releasing mechanism is arranged at the head of a frame and comprises:
the presser foot lifting lever is hinged on the rack and used for lifting the presser foot;
the wire releasing plate is used for pushing the wire clamping device to perform a wire releasing action;
the presser foot lifting drive plate is used for driving the presser foot lifting lever;
the driving motor is used for driving the driving cam, and the driving cam pushes the presser foot lifting driving plate and the thread loosening plate to move;
one end of the presser foot lifting drive plate is hinged and linked with one end of the thread loosening plate, and a certain distance is reserved between the other end of the presser foot lifting drive plate and the presser foot lifting lever; under the drive of the drive cam, the other end of the presser foot lifting drive plate rotates for a certain angle towards the presser foot lifting lever, and then contacts and drives the presser foot lifting lever.
Preferably, the presser foot lifting drive plate and the presser foot lifting lever are hinged on the frame by taking the pin shaft I as the center;
a pushing block is arranged on one side of the presser foot lifting drive plate; after the pressure foot lifting drive plate rotates for a certain angle, the push block contacts and drives the pressure foot lifting lever.
Preferably, one end of the presser foot lifting drive plate and one end of the thread loosening plate are hinged to each other by taking a pin shaft III as a center, and a roller is arranged on the pin shaft III; the driving cam drives the roller.
Preferably, the middle part of the thread loosening plate is provided with a strip-shaped hole, a fourth pin shaft is arranged in the strip-shaped hole, and the fourth pin shaft is fixed on the rack and limits the moving range of the thread loosening plate.
Preferably, a return spring is arranged between the presser foot lifting drive plate and the pin shaft IV, and the return spring enables the pushing block to tend to be far away from the presser foot lifting lever.
Preferably, the upper end of the return spring is hooked on the lower part of the pressure lifting pin driving plate, and the lower end of the return spring is hooked on the pin shaft four.
Preferably, when the driving cam is in an initial non-operating state, an included angle a between the pushing block and the lower side surface of the presser foot lifting lever is-degree.
Preferably, the middle part of the presser foot lifting lever is provided with an arc-shaped groove, a second pin shaft is arranged in the arc-shaped groove, and the second pin shaft is fixed on the rack and limits the swing range of the presser foot lifting lever.
Preferably, the driving motor is a servo motor or a stepping motor.
A sewing machine comprising a presser foot lifting and thread releasing mechanism as described above.
Compared with the prior art, the utility model has the outstanding and beneficial technical effects that:
1. the presser foot lifting lever and the thread loosening plate are connected by the presser foot lifting drive plate, the presser foot lifting drive plate and the thread loosening plate are driven to move by the drive cam, the thread loosening plate can independently run within a certain angle under the action of the presser foot lifting drive plate, thread loosening operation is realized, and then the thread loosening plate continuously rotates to drive the presser foot lifting lever to move, so that the presser foot lifting operation is further carried out.
The utility model provides a design both can independently loosen the line, can loosen the line again and lift the presser foot and go on jointly, and convenience simple to use is more nimble than current design in the structure, can guarantee work efficiency.
2. According to the first pin shaft, the presser foot lifting drive plate is connected with the presser foot lifting lever, the presser foot lifting drive plate can rotate through the first pin shaft, the presser foot lifting lever is moved upwards by matching with the pushing block, presser foot lifting operation is realized, only thread loosening action is executed without executing presser foot lifting operation only by lifting the presser foot drive plate, and when the presser foot lifting operation is required, the thread loosening action can be executed in one step, so that sewing threads can be supplied timely.
3. The cooperation of the arc-shaped groove and the pin shaft II can restrict the swing range of the presser foot lifting lever, and ensure the normal operation of the mechanism and the accuracy of the presser foot lifting.
4. The presser foot lifting drive plate and the thread loosening plate are hinged with each other through the third pin shaft, linkage of the presser foot lifting drive plate and the thread loosening plate is achieved, meanwhile, the roller on the third pin shaft can reduce abrasion caused when the drive cam drives the presser foot lifting drive plate and the thread loosening plate to move, operation precision and accuracy of the mechanism are guaranteed, and service life is guaranteed.
5. According to the utility model, the two end parts of the reset spring are respectively lifted on the presser foot driving plate and the pin shaft IV, the reset spring can pull the presser foot lifting driving plate and the thread loosening plate to be close to each other, so that the presser foot lifting driving plate and the thread loosening plate both return to the initial positions, the subsequent thread loosening and the subsequent thread lifting are ensured to be carried out smoothly, and meanwhile, the two ends of the reset spring do not need to be hooked on the rack, so that the scheme can be applied to the existing rack, and the practicability is better.
Drawings
FIG. 1 is a schematic view showing a structure of a sewing machine according to the present invention.
Fig. 2 is one of the structure diagrams of the presser foot lifting and releasing mechanism of the present invention.
Fig. 3 is a partial schematic structural view of the presser foot lifting and releasing mechanism of the present invention.
Fig. 4 is a second schematic structural view of the presser foot lifting and releasing mechanism of the present invention.
Reference numerals:
1-a frame;
2-driving the motor;
3-lifting a presser foot wrench;
4-an output shaft;
5-a drive cam;
6-pin shaft III; 61-a roller;
7-lifting the presser foot drive plate; 71-a pushing block;
8-wire loosing plate; 81-bar shaped holes; 82-inclined plane;
9-loosening the thread device; 91-a thread releasing rod;
10-presser foot lifting lever; 100-the underside; 101-an arc-shaped groove; 103-an abutment surface;
11-presser foot lifter plate;
12-presser bar;
13-pin shaft four;
14-pin II;
15-pin shaft I;
16-a return spring;
17-a wrench cam; 171-arc shaped face.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the sewing machine comprises a frame 1, wherein a presser foot lifting and releasing mechanism is arranged at the head part of the frame 1, and comprises a presser foot lifting lever 10, a thread releasing plate 8, a presser foot lifting drive plate 7 and a drive motor 2;
as shown in fig. 2, the presser foot lifting lever 10 is hinged on the frame 1, a presser foot rod 12 is vertically installed in the frame 1, a presser foot is installed at the lower end of the presser foot rod 12, and the presser foot rod 12 is connected with the presser foot lifting lever 10 through a presser foot lifting plate 11, so that the rotation of the presser foot lifting lever 10 can lift the presser foot.
The presser foot lifting drive plate 7 is rotatably arranged on the presser foot lifting lever 10, and a certain distance exists between one end of the presser foot lifting drive plate 7 and the presser foot lifting lever 10, namely, the end part can be abutted against the presser foot lifting lever 10 after the presser foot lifting drive plate 7 rotates for a certain angle;
as shown in fig. 4, the thread releasing plate 8 is movably mounted in the rack 1, the thread releasing device 9 is mounted on the rack 1, the lower end of the thread releasing plate 8 is formed with an inclined surface 82, and a thread releasing rod 91 of the thread releasing device 9 is movably abutted against the inclined surface 82;
the end parts of the presser foot lifting drive plate 7 and the thread loosening plate 8 are hinged with each other by taking a pin shaft three 6 as a center, a drive cam 5 is installed on the rack on the side surface of the pin shaft three 6, the drive cam 5 is arranged on an output shaft 4 of a drive motor 2 on the rack 1, the drive motor 2 drives the drive cam 5 to rotate, the presser foot lifting drive plate 7 and the thread loosening plate 8 can be simultaneously driven to move along with the rotation of the drive cam 5, and a thread loosening rod 91 is pushed through an inclined plane 82, so that a thread loosening device 9 loosens threads; after the presser foot lifting drive plate 7 rotates for a certain angle, the end part of the presser foot lifting drive plate 7 contacts the presser foot lifting lever 10 and drives the presser foot lifting lever 10 to rotate so as to carry out presser foot lifting operation.
The utility model is designed in such a way that a presser foot lifting drive plate 7 is used for connecting a presser foot lifting lever 10 and a thread loosening plate 8, then the presser foot lifting drive plate 7 and the thread loosening plate 8 are driven to move through a drive cam 5, under the action of the presser foot lifting drive plate 7, the thread loosening plate 8 can independently run within a certain angle to realize thread loosening operation, and then the presser foot lifting lever 10 is driven to move to further carry out presser foot lifting operation by continuing to rotate.
The utility model provides a design both can independently loosen the line, can loosen the line again and lift the presser foot and go on jointly, and convenience simple to use is more nimble than current design in the structure, can guarantee work efficiency.
As shown in fig. 3, the pin shaft three 6 is further provided with a roller 61, the driving cam 5 is formed with a working curved surface, and the rotation of the driving cam 5 causes the working curved surface to directly abut against the surface of the roller 61, so that the presser foot driving plate 7 and the thread loosening plate 8 are directly driven.
The roller 61 on the third pin shaft 6 can reduce the abrasion of the driving cam 5 for driving the presser foot lifting driving plate 7 and the thread loosening plate 8 to move, ensure the operation precision and accuracy of the mechanism and ensure the service life.
Further, as shown in fig. 3, the presser foot lifting drive plate 7 and the presser foot lifting lever 10 are hinged on the frame 1 by taking the first pin shaft 15 as a center;
a pushing block 71 is arranged on one side of the presser foot lifting drive plate 7; after the presser foot lifting drive plate 7 rotates for a certain angle, the push block 71 contacts and drives the presser foot lifting lever 10 to rotate.
In the working process, the presser foot lifting drive plate 7 cannot drive the presser foot lifting lever 10 at once, and the presser foot lifting lever 10 can be driven only after the presser foot lifting drive plate 7 is rotated by a certain angle, which is a space reserved for independent work of the thread loosening plate 8, so that only thread loosening action is executed without the presser foot lifting action; furthermore, when the presser foot needs to be lifted, the thread loosening action can be performed in one step, and the sewing thread can be supplied in time.
The middle of the presser foot lifting lever 10 is provided with an arc-shaped groove 101, a second pin shaft 14 is arranged in the arc-shaped groove 101, and the second pin shaft 14 is fixed on the frame 1, so that the swing of the presser foot lifting lever 10 can only be within the range of the arc-shaped groove.
The utility model utilizes the cooperation of the arc-shaped groove and the pin shaft II to restrict the swing range of the presser foot lifting lever, thereby ensuring the normal operation of the mechanism and the accuracy of the presser foot lifting.
Further setting, as shown in fig. 3, a strip-shaped hole 81 is formed in the middle of the thread loosening plate 8, a fourth pin shaft 13 is arranged in the strip-shaped hole 81, and the fourth pin shaft 13 is fixed on the rack 1.
The matching of the strip-shaped hole 81 and the pin shaft four 13 can restrict the moving range of the thread loosening plate 8 on one hand; on the other hand, the thread loosening plate 8 is guaranteed to move accurately, the thread loosening rod 91 can be pushed accurately, and thread loosening is achieved.
Further, as shown in fig. 4, a return spring 16 is arranged between the presser foot lifting drive plate 7 and the pin shaft four 13, the upper end of the return spring 16 is hooked on the lower part of the presser foot lifting drive plate 7, the lower end of the return spring 16 is hooked on the pin shaft four 13, and the push block 71 is enabled to tend to be far away from the presser foot lifting lever 10 through the return spring 16.
The presser foot lifting drive plate 7, the thread loosening plate 8 and the return spring 16 are arranged in a roughly triangular shape, and when the pushing block 71 is far away from the presser foot lifting lever 10, the upper end of the presser foot lifting drive plate 7 gradually moves upwards; meanwhile, the loosening plate 8 integrally moves upwards to reset the ejector rod 91 of the wire clamping device 9.
According to the utility model, two end parts of the reset spring 16 are respectively lifted on the presser foot lifting drive plate 7 and the pin shaft four 13, the reset spring 16 can pull the presser foot lifting drive plate 7 and the thread releasing plate 8 to be close to each other, so that the two parts both return to the initial positions, the subsequent thread releasing and presser foot lifting are ensured to be carried out smoothly, and meanwhile, two ends of the reset spring 16 are not required to be hooked on the frame, so that the scheme can be applied to the existing frame, and the practicability is better.
Further, as shown in fig. 3, when the driving cam 5 is in an initial non-operating state, an included angle a between the pushing block 71 and the lower side 100 of the presser foot lifting lever is 10 to 20 degrees, that is, the presser foot lifting driving plate 7 needs to rotate by 10 to 20 degrees, the pushing block can only contact the lower end face of the presser foot lifting lever 10, and then the pushing block continues to rotate, so as to push the presser foot lifting lever 10 to rotate, and perform the presser foot lifting operation.
As shown in fig. 1 and 4, a pressure foot lifting wrench 3 is further mounted on the frame, a wrench cam 17 is mounted in the frame 1, the wrench cam 17 is connected with the pressure foot lifting wrench 3, and the side surface of the wrench cam 17 is an arc surface 171; an abutting surface 103 is formed on the upper end side of the presser foot lifting lever 10.
The presser foot lifting wrench 3 is manually rotated to enable the arc surface 171 of the wrench cam 17 to abut against the abutting surface 103 and move on the abutting surface 103, so that the presser foot lifting lever 10 is pushed to rotate, and manual presser foot lifting is realized.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a lift presser foot and thread slackening mechanism, sets up the head at frame (1), its characterized in that includes:
the presser foot lifting lever (10) is hinged on the frame (1) and is used for lifting the presser foot;
the wire loosening plate (8) is used for pushing the wire clamping device to perform a wire loosening action;
a presser foot lifting drive plate (7) for driving the presser foot lifting lever (10);
the driving motor (2) is used for driving the driving cam (5), and the driving cam (5) pushes the presser foot lifting driving plate (7) and the thread loosening plate (8) to move;
one end of the presser foot lifting drive plate (7) is hinged and linked with one end of the thread loosening plate (8), and a certain distance is reserved between the other end of the presser foot lifting drive plate (7) and the presser foot lifting lever (10); the other end of the presser foot lifting drive plate (7) rotates for a certain angle towards the presser foot lifting lever (10) under the drive of the drive cam (5), and then contacts and drives the presser foot lifting lever (10).
2. The presser foot and thread take-up mechanism as claimed in claim 1, wherein:
the presser foot lifting drive plate (7) and the presser foot lifting lever (10) are hinged on the rack (1) together by taking a pin shaft I (15) as a center;
a pushing block (71) is arranged on one side of the presser foot lifting drive plate (7); after the presser foot lifting drive plate (7) rotates for a certain angle, the push block (71) contacts and drives the presser foot lifting lever (10).
3. The presser foot and thread take-up mechanism as claimed in claim 2, wherein:
one end of the presser foot lifting drive plate (7) and one end of the thread loosening plate (8) are hinged together by taking a pin shaft III (6) as a center, and a roller (61) is arranged on the pin shaft III (6); the driving cam (5) drives the roller (61).
4. The presser foot and thread take-up mechanism as claimed in claim 2, wherein:
a strip-shaped hole (81) is formed in the middle of the thread loosening plate (8), a pin shaft four (13) is arranged in the strip-shaped hole (81), and the pin shaft four (13) is fixed on the rack (1) and limits the moving range of the thread loosening plate (8).
5. The presser foot and thread take-up mechanism as claimed in claim 4, wherein:
and a return spring (16) is arranged between the presser foot lifting drive plate (7) and the pin shaft four (13), and the return spring (16) enables the pushing block (71) to tend to be far away from the presser foot lifting lever (10).
6. The presser foot and thread take-up mechanism as claimed in claim 5, wherein:
the upper end of the return spring (16) is hooked on the lower part of the presser foot lifting drive plate (7), and the lower end of the return spring (16) is hooked on the pin shaft four (13).
7. The presser foot and thread take-up mechanism as claimed in claim 6, wherein:
when the driving cam (5) is in an initial non-operating state, an included angle a between the pushing block (71) and the lower side surface (100) of the presser foot lifting lever is 10-20 degrees.
8. The presser foot and thread take-up mechanism as claimed in claim 2, wherein:
an arc-shaped groove (101) is formed in the middle of the presser foot lifting lever (10), a second pin shaft (14) is arranged in the arc-shaped groove (101), and the second pin shaft (14) is fixed on the rack and limits the swing range of the presser foot lifting lever (10).
9. The presser foot and thread take-up mechanism as claimed in claim 1, wherein:
the driving motor (2) is a servo motor or a stepping motor.
10. A sewing machine characterized by: comprising a presser foot and thread take-up mechanism as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121367916.2U CN215757905U (en) | 2021-06-18 | 2021-06-18 | Lift presser foot and thread loosening mechanism and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121367916.2U CN215757905U (en) | 2021-06-18 | 2021-06-18 | Lift presser foot and thread loosening mechanism and sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215757905U true CN215757905U (en) | 2022-02-08 |
Family
ID=80101109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121367916.2U Withdrawn - After Issue CN215757905U (en) | 2021-06-18 | 2021-06-18 | Lift presser foot and thread loosening mechanism and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215757905U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249879A (en) * | 2021-06-18 | 2021-08-13 | 浙江杜马缝纫机股份有限公司 | Lift presser foot and thread loosening mechanism and sewing machine |
-
2021
- 2021-06-18 CN CN202121367916.2U patent/CN215757905U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249879A (en) * | 2021-06-18 | 2021-08-13 | 浙江杜马缝纫机股份有限公司 | Lift presser foot and thread loosening mechanism and sewing machine |
| CN113249879B (en) * | 2021-06-18 | 2024-10-11 | 浙江杜马缝纫机股份有限公司 | Presser foot lifting and thread loosening mechanism and sewing machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20220208 Effective date of abandoning: 20241011 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20220208 Effective date of abandoning: 20241011 |