Presser foot interaction amount adjusting and presser foot lifting mechanism

Abstract

The present application belongs to sewing equipment technical field, and particularly to a presser foot interaction amount adjusting and lifting presser foot mechanism; the driving cam comprises a base circle surface and a cam surface, the presser foot lifting assembly is connected with the presser foot lifting shaft and the presser foot assembly respectively, the lifting presser foot crank is connected with the presser foot lifting shaft and the base circle surface or the cam surface respectively, the presser foot interaction amount adjusting assembly is connected with one end of the adjusting shaft and the presser foot assembly respectively, the other end of the adjusting shaft is connected with the driving cam through the adapter component; when the other end of the lifting presser foot crank is connected with the base circle surface, the presser foot lifting assembly does not act, the adapter component drives the presser foot interaction amount adjusting assembly to adjust the interaction amount with the driving cam; when the other end of the lifting presser foot crank is connected with the cam surface, the lifting presser foot crank swings to drive the presser foot lifting assembly to lift the presser foot, and the presser foot interaction amount changes from the maximum to the minimum; the present application realizes the lifting presser foot and the presser foot interaction amount adjusting by the driving motor and the driving cam respectively, and has compact structure and effectively reduces the production cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewing equipment, and particularly relates to a presser foot interaction amount adjusting and presser foot lifting mechanism. BACKGROUND

[0002] The presser foot of a sewing machine presses the cloth before sewing, and presses the cloth on the feed dog during sewing, so that the dog and the cloth have sufficient friction to transport the cloth, and ensure normal sewing. When sewing multiple layers of thick materials, the feed dog alone cannot meet the feeding requirements, and the cloth may slip or not be fed. Therefore, the inner and outer presser feet are alternately used to realize presser foot feeding. When the outer presser foot contacts the feed dog for feeding, the inner presser foot is lifted. When the outer presser foot does not contact the feed dog, the inner presser foot presses the cloth. In this way, the presser foot feeding is realized. When the cloth is folded into multiple layers in the sewing process, the cloth on one section has inconsistent thickness, and the height difference forms a step. The presser foot must adjust the relative height of the inner and outer presser feet, that is, the interaction amount, so that the outer presser foot can step over the step and normally sew.

[0003] Chinese invention patent (authorized publication number CN 113279156 A, published on August 20, 2021) discloses a comprehensive feeding thick material machine presser foot interaction amount adjusting and quick switching mechanism. The above-mentioned patent document discloses a mechanism for adjusting the interaction amount of the presser foot by using a gas cylinder or an electromagnet or an oil cylinder as a driver. The gas cylinder or the electromagnet or the oil cylinder as the driver cannot realize precise adjustment. In addition, when an automatic presser foot lifting mechanism is needed, another set of presser foot lifting mechanism needs to be configured to realize it, which makes the whole machine structure complex and the cost high. SUMMARY

[0004] The purpose of the present application is to provide a presser foot interaction amount adjusting and presser foot lifting mechanism with compact structure, effectively reducing production cost, and high control precision.

[0005] The present application is implemented as follows:

[0006] A kind of foot interaction amount adjusting and lifting foot mechanism, including drive motor, drive cam, foot lifting assembly, foot interaction amount adjusting assembly, foot assembly, the drive cam is rotated by drive motor, the drive cam includes base circle part and cam part, the base circle part includes base circle face, the cam part includes cam face;The input end of foot lifting assembly is connected with foot lifting shaft, the output end is connected with foot assembly, one end of lifting foot crank is fixedly connected with foot lifting shaft, the other end is connected with the base circle face or cam face of drive cam;The input end of the foot interaction amount adjusting assembly is connected with one end of adjusting shaft, the output end is connected with foot assembly, the other end of adjusting shaft is connected with drive cam by adapter component, the adapter component is eccentrically connected on the base circle part of drive cam;Drive motor rotates drive cam, when the other end of lifting foot crank is connected with base circle face, the foot lifting assembly does not act, the adapter component drives foot interaction amount adjusting assembly to adjust interaction amount with drive cam action;When the other end of lifting foot crank is connected with cam face, lifting foot crank swing drives foot lifting assembly to lift foot, and the foot interaction amount changes from maximum to minimum.

[0007] In the above-mentioned foot interaction amount adjusting and lifting foot mechanism, the foot assembly includes a triangular plate, an inner foot component and an outer foot component, the outer foot component and the input end of the foot lifting assembly are connected to the first connecting end of the triangular plate, the inner foot component is connected to the second connecting end of the triangular plate, and the output end of the foot interaction amount adjusting assembly is connected to the third connecting end of the triangular plate.

[0008] In the above-mentioned foot interaction amount adjusting and lifting foot mechanism, the adapter component includes an interaction amount adjusting crank and an interaction amount adjusting connecting rod, one end of the interaction amount adjusting crank is fixedly connected with the adjusting shaft, the other end of the interaction amount adjusting crank is connected with one end of the interaction amount adjusting connecting rod, and the other end of the interaction amount adjusting connecting rod is rotatably connected to the end face of the base circle part by a screw.

[0009] In the above-mentioned foot interaction amount adjusting and lifting foot mechanism, the other end of the lifting foot crank is provided with a swing rod roller, a bearing or a roller, and the swing rod roller, the bearing or the roller is in contact with the base circle face or the cam face of the drive cam.

[0010] In the above-mentioned foot interaction amount adjusting and lifting foot mechanism, the outer end of the cam part is provided with a concentric circle part concentrically arranged with the base circle part, and the concentric circle part includes a concentric circle face.

[0011] In the above-mentioned foot interaction amount adjusting and lifting foot mechanism, the connecting end of the cam face with the base circle face and the outer end of the concentric circle face are located at zero position.

[0012] In the above-mentioned foot interaction amount adjusting and lifting foot mechanism, the drive motor is a step motor.

[0013] In the above-mentioned presser foot interaction amount adjusting and presser foot lifting mechanism, the presser foot lifting assembly comprises a presser foot plate, one end of the presser foot plate is fixedly connected with the presser foot lifting shaft, the other end of the presser foot plate is provided with a first pin shaft, the outer presser foot component and the first connecting end of the triangular plate are hingedly connected with the first pin shaft, the other end of the presser foot plate is provided with a presser foot plate part, the upper part of the presser foot plate part is provided with a reset rod, a reset spring is sleeved on the reset rod, the lower end of the reset rod penetrates through the lower spring baffle and is limited below the lower spring baffle, the upper end of the reset rod is provided with an upper spring baffle, the two ends of the reset spring are tightly abutted on the upper spring baffle and the lower spring baffle respectively, the lower spring baffle is abutted on the presser foot plate part under the action of the reset spring, a through hole for the lower end of the reset rod to penetrate through is arranged on the presser foot plate part, and the reset spring drives the presser foot plate to reset.

[0014] In the above-mentioned presser foot interaction amount adjusting and presser foot lifting mechanism, the outer presser foot component is hingedly connected with one end of the first hinge part, the other end of the first hinge part is hingedly connected with the first pin shaft, and the second connecting end of the triangular plate is hingedly connected with the inner presser foot component through the second hinge part.

[0015] The outstanding advantages of the present application compared with the prior art are:

[0016] 1. The present application realizes the presser foot lifting and the presser foot interaction amount adjusting by the driving motor and the driving cam respectively, the structure is compact, automatic, intelligent, and the production cost is effectively reduced.

[0017] 2. The present application can control the height and the interaction amount of the presser foot lifting by controlling the clockwise and counterclockwise rotation angle of the output shaft of the driving motor, the precision is high, and the sewing occasions of different thickness and different material fabrics can be met. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is one of the stereogrammatical schematic views of the swing lever roller of the present application in the zero position;

[0019] Figure 2 is the second stereogrammatical schematic view of the swing lever roller of the present application in the zero position;

[0020] Figure 3 is one of the stereogrammatical schematic views of the swing lever roller of the present application in the presser foot lifting state;

[0021] Figure 4 is the second stereogrammatical schematic view of the swing lever roller of the present application in the presser foot lifting state;

[0022] Figure 5 is the stereogrammatical schematic view of the driving cam of the present application;

[0023] Figure 6 is the front view of the driving cam of the present application;

[0024] Figure 7 is a schematic view of the cam plate of the present application.

[0025] In the figure: 1, driving motor; 2, driving cam; 3, presser foot lifting assembly; 4, presser foot interaction amount adjusting assembly; 5, outer presser foot component; 6, inner presser foot component; 7, cam plate; 8, first connecting end; 9, second connecting end; 10, base circle part; 11, cam part; 12, base circle surface; 13, cam surface; 14, presser foot lifting shaft; 15, presser foot lifting crank; 16, adjusting shaft; 17, third connecting end; 18, interaction amount adjusting crank; 19, interaction amount adjusting connecting rod; 20, swing rod roller; 21, concentric circle part; 22, concentric circle surface; 23, cam bearing sleeve; 24, screw; 25, joint bearing; 26, presser foot pressure plate; 27, reset rod; 28, reset spring; 29, lower spring baffle; 30, upper spring baffle; 31, pressure plate part; 32, first hinged part; 33, second hinged part; 34, swing support; 35, first crank; 36, second crank; 37, third crank; 38, second pin shaft; 39, first connecting rod; 40, second connecting rod; 41, presser foot shaft; 42, swing rod. DETAILED DESCRIPTION

[0026] The present application will be further described in specific embodiments, with reference to the accompanying drawings, in which Figure 1 - 7:

[0027] The application provides a presser foot interaction amount adjusting and presser foot lifting mechanism, which comprises a driving motor 1, a driving cam 2, a presser foot lifting assembly 3, a presser foot interaction amount adjusting assembly 4 and a presser foot assembly, wherein the presser foot assembly comprises a triangular plate 7, an outer presser foot component 5 and an inner presser foot component 6 in the embodiment, the outer presser foot component 5 and the inner presser foot component 6 are connected to a first connecting end 8 and a second connecting end 9 of the triangular plate 7 respectively, the driving cam 2 is arranged on an output shaft of the driving motor 1, the driving cam 2 comprises a base circle part 10 and a cam part 11, the base circle part 10 comprises a base circle face 12, and the cam part 11 comprises a cam face 13; an input end of the presser foot lifting assembly 3 is connected with a presser foot lifting shaft 14, an output end is connected with the first connecting end 8 of the triangular plate 7 of the presser foot assembly, one end of a presser foot lifting crank 15 is arranged on the presser foot lifting shaft 14, and the other end is connected with the base circle face 12 or the cam face 13 of the driving cam 2; an input end of the presser foot interaction amount adjusting assembly 4 is connected with an adjusting shaft 16, and an output end is connected with a third connecting end 17 of the triangular plate 7, the adjusting shaft 16 is connected with the driving cam 2 through a transfer component, and the transfer component is eccentrically connected to the base circle part 10 of the driving cam 2; wherein the transfer component comprises an interaction amount adjusting crank and an interaction amount adjusting connecting rod 19, one end of the interaction amount adjusting crank 18 is fixedly connected with the adjusting shaft 16, the other end is connected with one end of the interaction amount adjusting connecting rod 19, and the other end of the interaction amount adjusting connecting rod 19 is rotatably connected to an end face of the base circle part 10 through a screw 24. The driving motor 1 can be a stepping motor or a servo motor. In the embodiment, the stepping motor is preferred.

[0028] The application can realize the adjustment of the presser foot interaction amount and the lifting of the presser foot through one motor, and the structure is compact. Through the driving of the stepping motor, the height of the lifting of the presser foot and the adjustment of the interaction amount can be accurately controlled.

[0029] The driving motor 1 is controlled by a controller to drive the driving cam 2 to rotate. When the other end of the presser lifting crank 15 is connected to the base circle surface 12 of the driving cam 2, the presser lifting crank 15 does not swing because the radius of the base circle surface 12 is equal, and the presser lifting shaft 14 does not swing, so that the presser lifting and lowering assembly 3 does not operate, and the outer presser component 5 and the inner presser component 6 do not operate to lift the presser. At this time, the interaction adjusting connecting rod 19 rotates with the driving cam 2 to drive the adjusting shaft 16 to operate and drive the presser interaction adjusting assembly 4 to adjust the interaction of the outer presser component 5 and the inner presser component 6. When the other end of the presser lifting crank 15 is connected to the cam surface 13 of the driving cam 2, the presser lifting crank 15 swings due to the different diameters of the cam surface 13, and drives the presser lifting crank 15 to swing, and drives the presser lifting shaft 14 to swing to drive the presser lifting and lowering assembly 3 to lift the presser (i.e., the outer presser component 5 and the inner presser component 6 are lifted at the same time), so as to ensure the lifting height of the presser, and the presser interaction is changed from the maximum to the minimum.

[0030] Specifically, when the output shaft of the driving motor 1 rotates clockwise, the base circle surface 12 of the driving cam 2 is connected to the other end of the presser lifting crank 15, and at this time, the interaction of the presser is adjusted. When the output shaft of the driving motor 1 rotates counterclockwise, the cam surface 13 of the driving cam 2 is connected to the other end of the presser lifting crank 15, and at this time, the presser is lifted.

[0031] Further, in order to make the driving cam 2 rotate flexibly, the other end of the presser lifting crank 15 is provided with a swing rod roller 20 or a bearing or a roller, which is connected to the base circle surface 12 and the cam surface 13 of the driving cam 2. When the driving cam 2 rotates, the swing rod roller 20 or the bearing or the roller rolls on the base circle surface 12 or the cam surface 13.

[0032] As shown in Figure 5 and Figure 6 , the outer end of the cam part 11 is provided with a concentric circle part 21 which is coaxial with the base circle part 10, and the concentric circle part 21 comprises a concentric circle surface 22. One end of the concentric circle surface 22 is connected to the end of the cam surface 13. The connection end of the cam surface 13 and the outer end of the concentric circle surface 22 are located at zero position. The purpose of the concentric circle part 21 is to reduce the output torque of the driving motor 1. When the swing rod roller 20 abuts against the concentric circle surface 22, the swing rod roller 20 will not fall down even if the motor does not output.

[0033] As shown in Figure 6As shown, the arc of the base circular surface 12 of the present invention is 180°. The outer end of the concentric circular portion 21 is the zero position. The radius of the cam surface 13 gradually increases from its connection with the base circular surface 12 to its end point. Counterclockwise rotation adjusts the presser foot interaction from 0° to 180°, while clockwise rotation of 170° controls the presser foot lift.

[0034] like Figures 1-4 As shown, a cam bearing sleeve 23 and a driving cam 2 are sequentially arranged along the axial direction on the output shaft of the driving motor 1. The cam bearing sleeve 23 and the driving cam 2 can be an integrated structure. During installation, the driving cam 2 is fixedly connected to the output shaft of the driving motor 1 through the cam bearing sleeve 23. In this embodiment, for ease of processing, the cam bearing sleeve 23 and the driving cam 2 are made into a split structure. The connection between the cam bearing sleeve 23 and the driving cam 2 is connected by a screw 24 arranged axially and eccentrically. The screw 24 is also used to connect the interaction amount adjustment connecting rod 19 and the driving cam 2. In order to make the rotation flexible, a joint bearing 25 is provided between the screw 24 and one end of the interaction amount adjustment connecting rod 19.

[0035] For example Figure 1 -and Figure 4 As shown, the drive motor 1 is arranged on the casing through a motor mounting plate 26, and an output shaft through hole is provided on the motor mounting plate 26. The output shaft of the drive motor 1 passes through the output shaft through hole and extends out of the motor mounting plate 26. The cam bearing sleeve 23 and the drive cam 2 are located at the outer end of the output shaft, and a bearing is provided between the output shaft and the output shaft through hole.

[0036] Specifically, the structure of the presser foot lifting assembly 3 is as follows: it includes a presser foot pressing plate 26, one end of the presser foot pressing plate 26 is fixedly connected to the presser foot lifting shaft 14, and the other end is provided with a first pin shaft, and the first connecting end 8 of the outer presser foot component 5 and the triangular plate 7 is hinged with the first pin shaft. The other end of the presser foot pressing plate 26 is provided with a pressing plate portion 31, and a reset rod 27 is provided above the pressing plate portion 31, and a reset spring 28 is sleeved on the reset rod 27. The lower end of the reset rod 27 passes through the lower spring baffle 29 and is limited below the lower spring baffle 29, and the upper end is provided with an upper spring baffle 30. The two ends of the reset spring 28 are respectively tightened on the lower spring baffle 29 and the upper spring baffle 30. The lower spring baffle 29 abuts on the pressing plate portion 31 under the action of the reset spring 28, and a through hole for the lower end of the reset rod to pass through is provided on the pressing plate portion. The reset spring 28 drives the presser foot pressing plate 26 to reset. Under the action of the return spring 28 , the other end of the presser foot lifting crank 15 or the rocker roller 20 can always be in contact with the driving cam 2 .

[0037] Further, the outer presser foot component 5 is hingedly connected to one end of a first hinge 32, and the other end of the first hinge 32 is hingedly connected to a first pin shaft. The second connecting end 9 of the triangular plate 7 is hingedly connected to the inner presser foot component 6 through a second hinge 33.

[0038] Specifically, the structure of the presser foot interaction amount adjusting assembly 4 is as follows: a swing bracket 34, a first crank 35, a second crank 36 and a third crank 37 are included. The swing bracket 34 includes a first arm and a second arm. The first arm is fixedly connected to the adjusting shaft 16. The second arm is swingably connected to the casing through a second pin shaft 38. A first connecting rod 39 and a second connecting rod 40 are respectively hingedly connected to the side wall adjacent to the first arm and the second arm. The other ends of the first connecting rod 39 and the second connecting rod 40 are hingedly connected to a third pin shaft. One end of the first crank 35 is hingedly connected to the third pin shaft, and the other end is fixedly connected to one end of a presser foot shaft 41. The other end of the presser foot shaft 41 is connected to the second crank 36. The other end of the second crank 36 is hingedly connected to one end of a swing rod 42. The other end of the swing rod 42 is hingedly connected to the third connecting end 17 of the triangular plate 7. One end of the third crank 35 is hingedly connected to the third pin shaft, and the other end is fixedly connected to the main shaft.

[0039] The above embodiment is only one of the preferred embodiments of the present application, and does not limit the scope of the present application. Any equivalent changes made in shape, structure and principle according to the present application should be covered within the scope of protection of the present application.

Claims

1. A presser foot interaction amount adjustment presser lifting mechanism, comprising a driving motor (1), a driving cam (2), a presser foot lifting assembly (3), a presser foot interaction amount adjustment assembly (4), a presser foot assembly, the driving cam (2) is driven to rotate by the driving motor (1), characterized in that: The driving cam (2) comprises a base circle part (10) and a cam part (11), the base circle part (10) comprises a base circle surface (12), and the cam part (11) comprises a cam surface (13); an outer end of the cam part (11) is provided with a concentric circle part (21) concentrically arranged with the base circle part (10), and the concentric circle part (21) comprises a concentric circle surface (22); the connecting end of the cam surface (13) and the base circle surface (12) and the outer end of the concentric circle surface (22) are located on the zero position; the arc of the base circle surface (12) is 180°, the outer end of the concentric circle part (21) is taken as the zero position, the connecting position of the cam surface (13) and the base circle surface (12) is taken as the starting point, the connecting position of the cam surface (13) and the concentric circle surface (22) is taken as the terminal point, the radius gradually increases from the starting point to the terminal point, the presser foot interaction amount is adjusted by rotating 0°-180° in the counterclockwise direction, and the presser foot lifting action is controlled by rotating 170° in the clockwise direction; the input end of the presser foot lifting assembly (3) is connected with the presser foot lifting shaft (14), the output end is connected with the presser foot assembly, one end of the presser foot lifting crank (15) is fixedly connected with the presser foot lifting shaft (14), and the other end is in contact with the base circle surface (12) or the cam surface (13) of the driving cam (2); the input end of the presser foot interaction amount adjusting assembly (4) is connected with one end of the adjusting shaft (16), the output end is connected with the presser foot assembly, the other end of the adjusting shaft (16) is connected with the driving cam (2) through a connecting part, and the connecting part is eccentrically connected to the base circle part (10) of the driving cam (2); the driving motor (1) drives the driving cam (2) to rotate, when the other end of the presser foot lifting crank (15) is in contact with the base circle surface (12), the presser foot lifting assembly (3) does not act, the connecting part drives the presser foot interaction amount adjusting assembly (4) to adjust the interaction amount by driving the driving cam (2), when the other end of the presser foot lifting crank (15) is in contact with the cam surface (13), the presser foot lifting crank (15) swings to drive the presser foot lifting assembly (3) to lift the presser foot, and the presser foot interaction amount changes from maximum to minimum. ​ 2. The presser foot interaction amount adjusting presser foot lifting mechanism according to claim 1, characterized by: The presser foot assembly comprises a triangular plate (7), an inner presser foot part (6) and an outer presser foot part (5), the outer presser foot part (5) and the input end of the presser foot lifting assembly (3) are connected to the first connecting end (8) of the triangular plate (7), the second connecting end (9) is connected with the inner presser foot part (6), and the third connecting end (17) is connected with the output end of the presser foot interaction amount adjusting assembly (4).

3. The presser foot interaction amount adjusting presser foot lifting mechanism according to claim 1 or 2, characterized in that: The connecting part comprises an interaction amount adjusting crank (18) and an interaction amount adjusting connecting rod (19), one end of the interaction amount adjusting crank (18) is fixedly connected with the adjusting shaft (16), the other end is connected with one end of the interaction amount adjusting connecting rod (19), and the other end of the interaction amount adjusting connecting rod (19) is rotatably connected to the end face of the base circle part (10) through a screw.

4. The presser foot interaction amount adjusting presser foot lifting mechanism according to claim 1 or 2, characterized by: The other end of the presser foot lifting crank (15) is provided with a swing rod roller (20) or a bearing or a roller, and the swing rod roller (20) or the bearing or the roller is in contact with the base circle surface (12) or the cam surface (13) of the driving cam (2).

5. A presser foot lifting mechanism for adjusting the presser foot interaction amount according to claim 1 or 2, characterized in that: The driving motor (1) is a stepping motor.

6. The presser foot interaction amount adjusting presser foot lifting mechanism according to claim 2, characterized by: The presser lifting assembly (3) comprises a presser plate (26), one end of the presser plate (26) is fixedly connected with the presser lifting shaft (14), the other end is provided with a first pin shaft, the outer presser component (5) and the first connecting end (8) of the cam (7) are hingedly connected with the first pin shaft, the other end of the presser plate (26) is provided with a plate part (31), the upper portion of the plate part (31) is provided with a reset rod (27), the reset rod (27) is sleeved with a reset spring (28), the lower end of the reset rod penetrates through a lower spring baffle (29) and is limited below the lower spring baffle (29), the upper end is provided with an upper spring baffle (30), the two ends of the reset spring (28) are tightly abutted on the upper spring baffle (30) and the lower spring baffle (29) respectively, the lower spring baffle (29) is abutted on the plate part (31) under the action of the reset spring (28), the plate part (31) is provided with a through hole for the lower end of the reset rod (27) to penetrate through, and the reset spring (28) drives the presser plate (26) to reset.

7. The presser foot interaction amount adjusting presser foot lifting mechanism according to claim 6, characterized by: The outer presser component (5) is hingedly connected with one end of a first hinge part (32), the other end of the first hinge part (32) is hingedly connected with the first pin shaft, the second connecting end (9) of the cam (7) is hingedly connected with the inner presser component (6) through a second hinge part (33).

8. The presser foot interaction amount adjusting presser foot lifting mechanism according to claim 2, characterized by: The presser interaction amount adjusting assembly (4) comprises a swing bracket (34), a first crank (35), a second crank (36) and a third crank (37), the swing bracket (34) comprises a first branch arm and a second branch arm, the first branch arm is fixedly connected with an adjusting shaft (16), the second branch arm is swingingly connected on the shell through a second pin shaft (38), first connecting rods (39) and second connecting rods (40) are respectively hingedly connected on the side walls adjacent to the first branch arm and the second branch arm, the other ends of the first connecting rods (39) and the second connecting rods (40) are hingedly connected on a third pin shaft, one end of the first crank (35) is hingedly connected with the third pin shaft, the other end is fixedly connected with one end of a presser shaft (41), the other end of the presser shaft (41) is connected with the second crank (36), the other end of the second crank (36) is hingedly connected with one end of a swing rod (42), the other end of the swing rod (42) is hingedly connected with the third connecting end (17) of the cam (7), one end of the third crank (37) is hingedly connected with the third pin shaft, the other end is fixedly connected with the main shaft.

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