CN213925311U - Presser foot lifting device and sewing machine - Google Patents
Presser foot lifting device and sewing machine Download PDFInfo
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- CN213925311U CN213925311U CN202022194222.5U CN202022194222U CN213925311U CN 213925311 U CN213925311 U CN 213925311U CN 202022194222 U CN202022194222 U CN 202022194222U CN 213925311 U CN213925311 U CN 213925311U
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- lifting
- presser foot
- shaft
- wrench
- swing arm
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Abstract
The utility model discloses a presser foot hoisting device and contain this kind of presser foot hoisting device's sewing machine. A presser foot lifting device comprises a presser foot lifting bracket component which is arranged at the head of a frame of a sewing machine; the lifting shaft assembly is arranged in a cross beam of the machine frame and used for lifting or putting down the presser foot lifting support assembly, and the lifting shaft assembly also comprises a driving motor which is arranged on the machine frame and used for driving the lifting shaft assembly; a rotating disk installed on a motor shaft of the driving motor; the rotating disc is provided with a curved surface stroke part, and the curvature of the contour line of the curved surface stroke part is gradually increased; one end of the crank is fixedly arranged on a lifting shaft of the lifting shaft assembly, and the other end of the crank is provided with a driven pin shaft; the driven pin shaft is abutted against the side wall of the curved surface stroke part. The lifting height and the lifting time of the presser foot are controlled by the stepping motor, so that the presser foot is conveniently and accurately lifted; and the presser foot is lifted automatically by connecting a control circuit and controlling the motor to rotate to start and stop.
Description
Technical Field
The utility model belongs to the technical field of sewing machine, refer in particular to a presser foot hoisting device and contain this kind of presser foot hoisting device's sewing machine.
Background
Currently, a presser foot lifting function in a sewing machine is one of the most commonly applied functions. But adjusting the height of the presser foot lift still requires manual adjustment by rotating the knob. Such an adjustment is time-consuming and labor-consuming and cannot be automated.
As patent numbers: 2019100330748 which discloses one particular design of a sewing machine. It can be seen from the above patent that it has a manual adjustment mechanism having an adjustment knob that is turned to adjust the position of the center of rotation of the limit link to vary the amount of alternation between the inner and outer presser feet.
However, the above adjustment mode is very traditional, and the design of the knob cannot meet the requirement of automation and intelligence.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a more intelligent also more accurate mode that drives presser foot and promote.
The purpose of the utility model is realized like this: a presser foot lifting device comprises
A presser foot lifting bracket assembly mounted on the frame head of the sewing machine;
a lift shaft assembly mounted within a cross beam of the frame for raising or lowering the presser foot lift bracket assembly, and further comprising
A drive motor mounted on the frame for driving the lift shaft assembly;
a rotating disk installed on a motor shaft of the driving motor; the rotating disc is provided with a curved surface stroke part, and the curvature of the contour line of the curved surface stroke part is gradually increased;
one end of the crank is fixedly arranged on a lifting shaft of the lifting shaft assembly, and the other end of the crank is provided with a driven pin shaft; the driven pin shaft is abutted against the side wall of the curved surface stroke part.
Preferably, the curved surface stroke is an internal groove formed on the rotating disc, or the curved surface stroke is an external contour of the rotating disc.
Preferably, the contour curve of at least a part of the wall surface of the curved stroke part is a spiral line which is centered on the axis of the motor shaft.
Preferably, a swing arm torsion spring is sleeved outside the lifting shaft and comprises a first pressure lever and a second pressure lever, and the first pressure lever is abutted against the inner side wall of the rack; the second pressure lever is arranged on the lifting shaft and rotates synchronously with the lifting shaft.
Preferably, the lifting shaft is sleeved with a pressure lifting swing arm, and the pressure lifting swing arm and the lifting shaft synchronously rotate; the second pressure lever is abutted against the upper end face of the lifting pressure swing arm.
Preferably, the pressure lifting swing arm comprises a pressure wheel part and a limiting part, and the pressure wheel part is arranged between the rotating cam and the second pressure rod; the second pressure bar is arranged between the pressure wheel part and the limiting part.
Preferably, a presser foot wrench is further arranged on the outer side of the rack, one end of the presser foot wrench is connected with a wrench shaft, a rotating cam is sleeved at the outer end of the wrench shaft, and the outer edge of the rotating cam abuts against the pressure lifting swing arm.
Preferably, the end face of the rotating cam is formed with a plurality of mounting holes, the mounting holes are used for being connected with the wrench shaft, and the wrench shaft is connected with different mounting holes so as to drive the lifting shaft to rotate in different radians.
Preferably, a connecting shaft part is formed at one end of the pressure foot wrench, and the wrench shaft is sleeved in the connecting shaft part; a wrench torsion spring is sleeved outside the connecting shaft part and comprises a third pressure rod and a fourth pressure rod, and the third pressure rod penetrates through the pressure foot wrench; the fourth pressure lever penetrates through the rack.
Preferably, one end of the lifting shaft is sleeved with a lifting swing arm and synchronously rotates along with the lifting shaft; the presser foot lifting support assembly comprises a lifting frame, and the lower end part of the lifting frame is connected with a presser foot rod; one side of the lifting frame is extended and formed with a supporting part, and the lifting swing arm is supported against the lower end face of the supporting part.
A sewing machine comprising a presser foot lift arrangement as claimed in any preceding claim.
Compared with the prior art, the utility model outstanding and profitable technological effect is:
1. the utility model utilizes the existing structure of the shell and controls the lifting height and the lifting time of the presser foot through the stepping motor, thereby conveniently and accurately realizing the lifting of the presser foot; and the presser foot is lifted automatically by connecting a control circuit and controlling the motor to rotate to start and stop. Simultaneously the utility model discloses a lift drive process simple structure of presser foot, the process is clear and definite.
Drawings
FIG. 1 is a schematic view of the overall structure of the sewing machine of the present invention;
FIG. 2 is one of the schematic structural views of the foot lifting device of the present invention;
FIG. 3 is a second simplified structural view of the foot lift of the present invention;
fig. 4 is a third schematic view of the foot lifting device of the present invention;
FIG. 5 is a schematic view of the construction of the rotating disk;
FIG. 6 is an enlarged view of the lift and press swing arm and associated components;
fig. 7 is an enlarged view of the presser foot wrench and related components.
In the figure: 1-a presser foot assembly; 2-a presser foot lift bracket assembly; 3-a presser bar; 4-lifting the swing arm; 5-lifting the shaft assembly; 6-a presser foot wrench; 7-rotating the cam; 8-lifting and pressing the swing arm; 9-a crank; 10-a rotating disc; 11-a drive motor; 12-curved surface stroke; 13-motor shaft; 14-a driven pin shaft; 15-helix; 21-a lifting frame; 22-an abutment; 51-a lift shaft; 52-swing arm torsion spring; 53-a first compression bar; 54-a second compression bar; 61-wrench shaft; 62-a connecting shaft portion; 63-wrench torsion spring; 64-a third compression bar; 65-a fourth strut; 71-mounting holes; 81-a press wheel part; 82-a limiting part; 100-machine frame.
Detailed Description
The invention will be further described with reference to specific embodiments.
The first embodiment is as follows: as shown in fig. 1-7, a sewing machine comprises a frame 100, a presser foot assembly 1 is arranged at one end of the frame 100, and the presser foot assembly 1 comprises a presser foot rod 3; a presser foot lift is also provided within the frame 100.
The presser foot lifting device comprises
A presser foot lifting bracket assembly 2 mounted on the head of the frame 100 of the sewing machine; the function of the presser foot lift bracket assembly 2 is to connect with the presser foot assembly 1 and ultimately lift the presser foot.
A lift shaft assembly 5 mounted within the cross beam of the frame 100 for raising and lowering the presser foot lift bracket assembly 2, the lift shaft assembly 5 in this embodiment rotationally driving movement of the lift bracket assembly 2.
Also comprises
A driving motor 11 mounted on the frame 100 for driving the lift shaft assembly 5;
a rotary disk 10 mounted on a motor shaft 13 of the driving motor 11; the rotating disc 10 is provided with a curved surface stroke part 12, and the curvature of the contour line of the curved surface stroke part 12 is gradually increased;
a crank 9, one end of which is fixedly arranged on a lifting shaft 51 of the lifting shaft assembly 5, and the other end of which is provided with a driven pin shaft 14; the follower pin 14 abuts against the side wall of the curved stroke 12.
Therefore, the curvature of the contour line of the curved stroke part 12 is gradually increased, so that the adjustment of the change rate can be realized. Specifically speaking, through the increase of contour line camber, can let after the motor rotated certain fixed angle for a bigger angle that crank 9 can rotate, the speed that changes also can increase moreover, thereby can both let the presser foot have trafficability characteristic to the cloth of different thickness.
As also shown in fig. 4, the axis of the follower pin 14 is in a parallel position, not collinear, with the axis of the motor shaft 13. Due to the eccentric design, the driven pin 14 can be driven.
Therefore, in the above technical solution, the driven pin 14 can be driven to rotate in the curved surface stroke portion 12 by the rotation of the driving motor 11, and then the lifting shaft 51 is driven to rotate, thereby lifting the presser foot lifting bracket assembly 2.
Compared with the prior art, the mode can save more labor and conveniently realize the function of automatically lifting the presser foot. The specific implementation mode is as follows: firstly, in actual use, the driving motor 11 is connected with an electric control system, and then the lifting height of the presser foot can be adjusted according to actual conditions by controlling the rotating angle of the driving motor 11; the presser foot can be automatically lifted by controlling the starting and stopping time of the driving motor 11.
Therefore, compared with the prior art, the technical scheme is more intelligent and automatic, and can improve the production efficiency and improve the sewing precision.
Preferably, the curved stroke 12 is an internal groove formed in the rotating disk 10. The contour curve of at least a part of the wall surface of the curved surface stroke part 12 is a spiral line 15, and the spiral line 15 is centered on the axis of the motor shaft 13. The spiral line 15 can make the profile curve transition smooth and easy, reduce the loss of motor and noise reduction. Therefore, as a further preferred technical scheme, the outer side of the driven pin shaft 14 is also sleeved with the roller, so that the friction force is further reduced, the smooth degree of the operation of the equipment is improved, and the normal service life of the equipment is ensured.
Preferably, a swing arm torsion spring 52 is sleeved outside the lifting shaft 51, the swing arm torsion spring 52 comprises a first compression bar 53 and a second compression bar 54, and the first compression bar 53 abuts against the inner side wall of the rack 100; the second pressing lever 54 is provided on the lift shaft 51 and rotates in synchronization with the lift shaft 51.
This technical scheme specifically discloses a technical scheme that can drive lift axle 51 and reset. Specifically, after the driving motor 11 rotates and lifts the presser foot lifting bracket assembly 2, the motor is reset, but in the present embodiment, due to the design of the curved surface stroke part 12, a mechanism is needed to reset the lifting shaft 51 at this time, and at least the resetting of the auxiliary lifting shaft 51 is needed.
Therefore, in order to solve the above technical problem, in the embodiment, a swing arm torsion spring 52 is sleeved outside the lifting shaft 51, the swing arm torsion spring 52 is deformed by arranging the second pressing rod 54 on the lifting shaft 51 and rotating synchronously with the lifting shaft 51, and the first pressing rod 53 abuts against the inner side wall of the rack 100, so as to provide a reaction force, so that the lifting shaft 51 can be reset.
In this embodiment, the second pressing rod 54 may be directly welded to the lift shaft 51, thereby being implemented. Or a hole may be formed through which the second plunger 54 passes. Or by tightly wrapping the second presser bar 54 around the lift shaft 51.
However, as a more preferable technical solution, in the present embodiment, the lifting shaft 51 is externally sleeved with a lifting and pressing swing arm 8, and the lifting and pressing swing arm 8 and the lifting shaft 51 rotate synchronously; the second pressure lever 54 abuts against the upper end face of the lifting and pressing swing arm 8.
The simultaneous rotation of the lifting and depressing swing arm 8 and the lifting shaft 51 is achieved by punching a hole in the lifting and depressing swing arm 8 in the radial direction of the lifting shaft 51 and by using a fastener to pass through the hole for synchronization. Therefore, the second pressure lever 54 directly abuts against the lifting and pressing swing arm 8, the structure is simple, and the assembly is convenient.
Preferably, the pressure-raising swing arm 8 comprises a pressure wheel part 81 and a limiting part 82, wherein the pressure wheel part 81 is arranged between the rotating cam 7 and the second pressure rod 54; the second pressing rod 54 is arranged between the pressing wheel part 81 and the limiting part 82. The above-mentioned technical solution specifically discloses a lifting and pressing swing arm 8, and also explains that the second pressure lever 54 is linked with the lifting shaft 51 by pressing on the pressure wheel part 81. Thereby further constraining the position of the swing arm torsion spring 52.
Preferably, the pressure wheel portion 81 has a 7-shaped overall shape, and the rotating cam 7 abuts against the inside of the pressure wheel portion 81.
In conventional sewing machines there is a means for manually lifting the presser foot by means of a spanner, but in the existing triple-synchronous machines there is no such an arrangement.
In order to solve the above technical problem, preferably, a pressure foot wrench 6 is further disposed outside the machine frame 100, one end of the pressure foot wrench 6 is connected with a wrench shaft 61, the outer end of the wrench shaft 61 is sleeved with a rotating cam 7, and the outer edge of the rotating cam 7 abuts against a pressure lifting swing arm 8; in the present embodiment, the rotating cam 7 is provided in the housing 100. Therefore, the presser foot wrench 6 is rotated to drive the wrench shaft 61 to rotate, the rotation of the rotating cam 7 is driven by the rotation of the wrench shaft 61, then the rotating cam 7 is used for driving the lifting swing arm 8 to rotate, and finally the lifting shaft 51 is rotated.
Based on above-mentioned technical scheme, just can realize manual presser foot that lifts, increased the function. The product competitiveness is improved.
Preferably, the end surface of the rotating cam 7 is formed with a plurality of mounting holes 71, the mounting holes 71 are used for connecting with the wrench shaft 61, and the wrench shaft 61 is connected with different mounting holes 71 to drive the lifting shaft 51 to rotate in different arcs.
This technical scheme specifically discloses a technical scheme that realizes through rotating presser foot spanner 6 adjustment presser foot lifting height. The connection of the wrench shaft 61 to the different mounting holes 71 has different rotation centers, so that different rotation tracks can be obtained. Thereby can drive and lift the pivoted angle of pressing arm 8, and then change the height that the presser foot promoted.
Preferably, a connecting shaft part 62 is formed at one end of the presser foot wrench 6, and the wrench shaft 61 is sleeved in the connecting shaft part 62; a wrench torsion spring 63 is sleeved outside the connecting shaft part 62, the wrench torsion spring 63 comprises a third pressure lever 64 and a fourth pressure lever 65, and the third pressure lever 64 is arranged in the presser foot wrench 6 in a penetrating manner; the fourth pressing rod 65 is arranged in the machine frame 100 in a penetrating mode.
The technical scheme that a torsion spring is additionally arranged at the position of the presser foot wrench 6 to assist the resetting of the presser foot wrench 6 is specifically disclosed. Such design is simple effective and laborsaving.
Preferably, one end of the lifting shaft 51 is sleeved with the lifting swing arm 4 and rotates synchronously with the lifting shaft 51; the presser foot lifting support assembly 2 comprises a lifting frame 21, and the lower end part of the lifting frame 21 is connected with a presser foot rod; an abutting part 22 is formed on one side of the lifting frame 21 in an extending mode, and the lifting swing arm 4 abuts against the lower end face of the abutting part 22.
This technical scheme specifically discloses a presser foot lift's concrete scheme, supports portion 22 through the shaping in hoisting frame 21 one side to utilize to support portion 22 and promote the relative extrusion between the swing arm 4, thereby realize the promotion to presser foot lift bracket component 2, finally realize the promotion of presser foot.
The synchronous rotation between the lifting swing arm 4 and the lifting shaft 51 is achieved by fasteners radially penetrating the lifting swing arm 4 and abutting against the end face of the lifting shaft 51.
The second embodiment is basically the same as the first embodiment, but the difference is that the curved stroke part 12 is the outer contour of the rotating disk. The driven pin 14 abuts against the outer contour surface, and the driven pin 14 can be driven to swing by the rotation of the motor shaft 13.
Compared with the first embodiment, no inner groove needs to be machined in the rotating disk 10, so that the manufacturing is simpler, and the manufacturing cost is reduced.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. A presser foot lifting device comprises
A presser foot lifting bracket component (2) which is arranged at the head of a frame (100) of the sewing machine;
a lifting shaft assembly (5) mounted in a beam of the frame (100) for raising or lowering the presser foot lift bracket assembly (2),
also comprises
A drive motor (11) mounted on the frame (100) for driving the lift shaft assembly (5);
a rotating disk (10) mounted on a motor shaft (13) of the drive motor (11); a curved surface stroke part (12) is arranged on the rotating disc (10), and the curvature of the contour line of the curved surface stroke part (12) is gradually increased;
one end of the crank (9) is fixedly arranged on a lifting shaft (51) of the lifting shaft assembly (5), and the other end of the crank is provided with a driven pin shaft (14); the driven pin shaft (14) is pressed on the curved surface stroke part (12).
2. Presser foot lift arrangement according to claim 1, wherein said curved stroke (12) is an internal groove formed in the rotary disc (10) or wherein said curved stroke (12) is the outer contour of the rotary disc.
3. Presser foot lift arrangement according to claim 1, wherein the contour curve of at least a part of the curved stroke (12) is a helix (15), which helix (15) is centered on the axis of the motor shaft (13).
4. The presser foot lift arrangement according to claim 1, wherein a swing arm torsion spring (52) is sleeved on the lift shaft (51), the swing arm torsion spring (52) comprises a first pressure lever (53) and a second pressure lever (54), and the first pressure lever (53) abuts against an inner side wall of the frame (100); the second pressure lever (54) is arranged on the lifting shaft (51) and rotates synchronously with the lifting shaft (51).
5. The presser foot lift arrangement according to claim 4, wherein the lift shaft (51) is externally sleeved with a lifting and pressing swing arm (8), and the lifting and pressing swing arm (8) rotates synchronously with the lift shaft (51); the second pressure lever (54) is abutted against the upper end face of the lifting and pressing swing arm (8).
6. Presser foot lift arrangement according to claim 5, wherein said pressure swing arm (8) comprises a pressure wheel portion (81) and a limiting portion (82), said pressure wheel portion (81) being arranged between the rotating cam (7) and the second pressure bar (54); the second pressure lever (54) is arranged between the pressure wheel part (81) and the limiting part (82).
7. A presser foot lifting device according to claim 1 or 5, characterized in that a presser foot wrench (6) is further arranged outside the frame (100), one end of the presser foot wrench (6) is connected with a wrench shaft (61), the outer end of the wrench shaft (61) is sleeved with a rotating cam (7), and the outer edge of the rotating cam (7) abuts against the lifting swing arm (8).
8. Presser foot lift arrangement according to claim 7, wherein the end face of the rotary cam (7) is formed with a number of mounting holes (71), the mounting holes (71) being adapted for connection to the wrench shaft (61), the wrench shaft (61) being adapted to be connected to different mounting holes (71) for driving the lifting shaft (51) to rotate through different arcs;
one end of the presser foot wrench (6) is formed with a connecting shaft part (62), and a wrench shaft (61) is sleeved in the connecting shaft part (62); a wrench torsion spring (63) is sleeved outside the connecting shaft part (62), the wrench torsion spring (63) comprises a third pressure lever (64) and a fourth pressure lever (65), and the third pressure lever (64) is arranged in the pressure foot wrench (6) in a penetrating manner; the fourth pressure lever (65) penetrates through the rack (100).
9. Presser foot lift arrangement according to claim 1, wherein one end of the lift shaft (51) is sleeved with a lift swing arm (4) and rotates synchronously with the lift shaft (51); the presser foot lifting support assembly (2) comprises a lifting frame (21), and the lower end part of the lifting frame (21) is connected with a presser foot rod (3); one side of the lifting frame (21) is extended and formed with a leaning part (22), and the lifting swing arm (4) leans against the lower end face of the leaning part (22).
10. A sewing machine characterized by: including the presser foot lift arrangement of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022194222.5U CN213925311U (en) | 2020-09-29 | 2020-09-29 | Presser foot lifting device and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022194222.5U CN213925311U (en) | 2020-09-29 | 2020-09-29 | Presser foot lifting device and sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213925311U true CN213925311U (en) | 2021-08-10 |
Family
ID=77218885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022194222.5U Active CN213925311U (en) | 2020-09-29 | 2020-09-29 | Presser foot lifting device and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213925311U (en) |
-
2020
- 2020-09-29 CN CN202022194222.5U patent/CN213925311U/en active Active
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