CN214572599U - Tooth height-adjustable lifts tooth mechanism - Google Patents

Abstract

The utility model relates to a tooth height-adjustable's tooth lifting mechanism, including adjusting eccentric, eccentric cover, compressing tightly subassembly, adjustment disk and locking Assembly, it has rotationally to cup joint at the epaxial eccentric section of thick bamboo portion of lifting tooth and fixes at the left shoulder portion of eccentric section of thick bamboo portion to adjust eccentric, eccentric cover suit on eccentric section of thick bamboo portion outer peripheral face and with shoulder portion friction contact, lifting tooth connecting rod one end rotationally the suit on eccentric cover, the other end is used for articulating with the dental articulator, the adjustment disk is installed at lifting tooth epaxially and is located eccentric cover right side to it is fixed mutually all in circumference and axial with lifting tooth axle, be equipped with on the adjustment disk with eccentric cover complex regulation spout, eccentric cover right side card is gone into in adjusting the spout, and eccentric cover and regulation spout bottom surface friction contact, compressing tightly the subassembly and fixing on lifting tooth epaxially for make adjust between eccentric and the eccentric cover, The eccentric sleeve and the adjusting disc are axially pressed; the locking assembly is used for locking and adjusting the circumferential position of the eccentric center.

Description

Tooth height-adjustable lifts tooth mechanism

Technical Field

The utility model relates to a sewing machine tool field, concretely relates to tooth height-adjustable lifts tooth mechanism.

Background

In the sewing machine, a feeding part of the sewing machine comprises a feeding mechanism b and a feed lifting tooth mechanism a, as shown in attached figure 1, teeth 3 are installed on a tooth frame 2, two ends of the tooth frame 2 are respectively hinged to output ends of the feeding mechanism b and the feed lifting tooth mechanism a, the feeding mechanism b drives the tooth frame 2 and the teeth 3 to move back and forth, the feed lifting tooth mechanism a drives the tooth frame 2 and the teeth 3 to move up and down, and the up and down and the back and forth movement are matched through a certain time sequence to form a common elliptic cloth feeding track.

In the existing sewing machine, the height range of the up-and-down movement of the teeth 3 is a fixed value and is set according to the assembly process of the machine type. Different tooth height ranges are needed to be used for sewing different sewing materials in the market, so that the existing feed lifting mechanism a has poor flexibility and cannot meet various working requirements.

Disclosure of Invention

In view of the above disadvantages of the prior art, the to-be-solved technical problem of the present invention is to provide a tooth lifting mechanism with adjustable tooth height, which can flexibly adjust the height of the tooth as required, and is simple in operation.

In order to realize the aim, the utility model provides a tooth lifting mechanism with adjustable tooth height, which comprises a tooth lifting shaft, a tooth lifting connecting rod, an adjusting eccentric, an eccentric sleeve, a pressing component, an adjusting disc and a locking component, the adjusting eccentric is provided with an eccentric cylinder part which can be rotatably sleeved on the feed lifting shaft and a shoulder part which is fixed at one end of the eccentric cylinder part, the eccentric sleeve can be rotatably sleeved on the eccentric cylinder part, one end of the eccentric sleeve is in friction contact with the end face of the shoulder part, the adjusting disc is fixed on the feed lifting shaft and is positioned at the other end of the eccentric sleeve, an adjusting chute matched with the eccentric sleeve is arranged on the side surface of the adjusting disk, one end of the eccentric sleeve facing the eccentric sleeve is clamped in the adjusting chute, the end surface of the eccentric sleeve is in frictional contact with the bottom surface of the adjusting chute, one end of the tooth lifting connecting rod is rotatably sleeved on the eccentric sleeve, and the other end of the tooth lifting connecting rod is hinged with the tooth rack; the pressing assembly is fixed on the feed lifting shaft and applies axial pressure to the adjusting eccentric, so that the adjusting eccentric and the eccentric sleeve and the adjusting disc are kept pressed in the axial direction; the locking assembly is used for locking and adjusting the circumferential position of the eccentric center.

Furthermore, the compressing assembly comprises a compressing nut screwed on the feed lifting shaft and a butterfly gasket, the compressing nut compresses the butterfly gasket on the adjusting eccentric, and the butterfly gasket and the adjusting disc are respectively positioned at two ends of the adjusting eccentric.

Furthermore, an arc-shaped limiting groove is formed in the shoulder part for adjusting eccentricity, a limiting pin is installed on the eccentric sleeve and is located in the limiting groove, and the limiting pin slides in the limiting groove when the eccentric sleeve is oppositely adjusted to rotate eccentrically.

Furthermore, the eccentric locking groove is formed in the adjusting part, the locking assembly comprises a locking piece matched with the locking groove, the locking piece is used for being movably installed on the bottom plate of the sewing machine, and the locking piece can be inserted into or fall off the locking groove.

Further, the locking assembly further comprises a resilient return structure acting on the locking member.

Further, the retaining member is the iron core, locking Assembly still includes fixed mounting's main body cover and spacing spring, the winding has the coil on the main body cover, the iron core wears to establish in the main body cover in a flexible way, spacing spring is used for on the iron core, and to the elasticity of iron core along the direction of keeping away from the locking groove.

Furthermore, the locking assembly is used for being connected with an electric control system of the sewing machine, and the electric control system controls the locking action and the unlocking action of the locking assembly.

Further, the feed lifting shaft is driven circumferentially by a feed lifting driving source.

Further, the tooth lifting driving source is a motor.

Further, the lifting tooth device also comprises a hand wheel fixed on the lifting tooth shaft.

As described above, the utility model relates to a tooth lifting mechanism has following beneficial effect:

through setting the adjusting eccentric, the eccentric sleeve, the compressing assembly, the adjusting disc and the locking assembly, when the device works normally, the lifting tooth shaft drives the compressing assembly and the adjusting disc to rotate synchronously, the adjusting disc drives the eccentric sleeve to rotate synchronously through the adjusting chute on the adjusting disc, under the condition that the compressing assembly applies axial pressure to the adjusting eccentric, friction force exists between the adjusting eccentric and the eccentric sleeve and between the eccentric sleeve and the adjusting disc, the adjusting disc drives the eccentric sleeve and the adjusting eccentric to rotate synchronously through the friction force, and the position angles of the adjusting eccentric and the eccentric sleeve are fixed mutually; when the height of teeth needs to be adjusted, the locking assembly is operated to circumferentially lock the adjusting eccentric, then the tooth lifting shaft is rotated to drive the pressing assembly and the adjusting disc to synchronously rotate, the adjusting disc drives the eccentric sleeve to overcome the friction force between the eccentric sleeve and the shoulder part for adjusting the eccentric through the adjusting chute to rotate, and under the limitation of the adjusting chute, the eccentric sleeve slides along the length of the adjusting chute to displace a small section, so that the eccentric sleeve relatively rotates on the eccentric cylinder part for adjusting the eccentric, the distance between the peripheral circular axis of the eccentric sleeve and the axis of the tooth lifting shaft is changed, namely the eccentric amount of the tooth lifting is changed; then the locking assembly is released, the adjusting disc, the eccentric sleeve and the adjusting eccentric are returned to the circumferential mutually fixed state and then returned to the working state again, and the range of the tooth lifting connecting rod driving the tooth frame to swing up and down is also changed due to the change of the eccentric amount of the tooth lifting, so that the adjustment of the height of the teeth is realized. The utility model discloses a lifting teeth mechanism can adjust the height of tooth as required in a flexible way, adjusts in a flexible way, and the motion is reliable, and adaptability is good, can satisfy sewing machine's multiple sewing needs.

Drawings

FIG. 1 is a schematic view showing a structure of a feeding unit of a sewing machine.

Fig. 2 is a schematic structural diagram of the tooth lifting mechanism of the present invention.

Fig. 3 is an exploded view of the tooth lifting mechanism of the present invention.

Fig. 4 is a schematic structural diagram of the eccentric adjustment of the present invention.

Fig. 5 is an assembly schematic diagram of the tooth lifting mechanism of the present invention.

Fig. 6 is a schematic view of the tooth lifting mechanism of the present invention.

Fig. 7 is a schematic diagram of the adjustment operation of the tooth lifting mechanism of the present invention.

Fig. 8 is a schematic structural diagram of a locking assembly according to the present invention.

Description of the element reference numerals

a lifting tooth mechanism

b feeding mechanism

1 base plate

2 dental articulator

3 teeth

4 needle plate

5 pressing nut

6 butterfly gasket

7 adjusting eccentricity

7-1 eccentric cylinder part

7-2 shoulder

7-3 spacing groove

7-4 locking groove

8 locking assembly

81 limit clamp spring

82 return spring

83 push button shaft

84 iron core

85 main body shell

86 spacing spring

87 iron core limiting cover plate

9 limiting pin

10 eccentric sleeve

11 needle roller bearing

12 lifting tooth connecting rod

13 adjusting disk

13-1 regulating chute

14 lifting tooth shaft

14-1 thread segment

15 hinge pin

16 tooth lifting motor

17 hand wheel

18 tooth height adjusting button

19 display

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be considered as the scope of the present invention without substantial changes in the technical content.

Referring to fig. 1 to 8, the present invention provides a tooth lifting mechanism with adjustable tooth height, including a lifting tooth shaft 14 and a lifting tooth connecting rod 12, further including an adjusting eccentric 7, an eccentric sleeve 10, a pressing component, an adjusting disk 13 and a locking component 8, wherein the adjusting eccentric 7 has an eccentric cylinder 7-1 rotatably sleeved on the lifting tooth shaft 14 and a shoulder 7-2 fixed on one end of the eccentric cylinder 7-1, the eccentric sleeve 10 is rotatably sleeved on the eccentric cylinder 7-1, one end of the eccentric sleeve 10 is in friction contact with the end surface of the shoulder 7-2, the adjusting disk 13 is fixed on the lifting tooth shaft 14 and is located at the other end of the eccentric sleeve 10, an adjusting chute 13-1 matched with the eccentric sleeve 10 is arranged on the side surface of the adjusting disk 13, one end of the eccentric sleeve 10 towards the eccentric sleeve 10 is clamped in the adjusting chute 13-1, The end surface of the tooth lifting connecting rod 12 is in frictional contact with the bottom surface of the adjusting chute 13-1, one end of the tooth lifting connecting rod is rotatably sleeved on the eccentric sleeve 10, and the other end of the tooth lifting connecting rod is hinged with the tooth rack 2; the pressing component is fixed on the feed lifting shaft 14 and applies axial pressure to the adjusting eccentric 7, so that the pressing is kept between the adjusting eccentric 7 and the eccentric sleeve 10 and between the eccentric sleeve 10 and the adjusting disc 13 in the axial direction; the locking assembly 8 is used for locking the circumferential position of the adjusting eccentric 7.

For convenience of explanation, the axial direction of the feed lifting shaft 14 is referred to as the left-right direction in the present application. The width of the adjusting chute 13-1 is equal to or slightly larger than the size of the outer ring of the eccentric sleeve 10, so that the right side of the eccentric sleeve 10 can be embedded in the adjusting chute 13-1; meanwhile, the length of the eccentric cylinder part 7-1 of the adjusting eccentric 7 is slightly less than that of the eccentric sleeve 10. The locking assembly 8 may be mounted on the bed 1 of the sewing machine in the vicinity of the adjustment eccentric 7, or on other structures.

The utility model relates to a main theory of operation of lifting teeth mechanism does: referring to fig. 2 and 3, after the feed lifting mechanism is assembled, the pressing assembly and the adjusting disk 13 are respectively positioned on the left side and the right side of the adjusting eccentric 7, the pressing assembly provides axial pressing force to press the adjusting eccentric 7 from the left side, so that the pressing force is kept between the adjusting eccentric 7 and the eccentric sleeve 10 and between the eccentric sleeve 10 and the adjusting disk 13 in the axial direction and is in frictional contact, and therefore, friction force exists between the adjusting eccentric 7 and the eccentric sleeve 10 and between the eccentric sleeve 10 and the adjusting disk 13. Referring to fig. 5, 6 and 7, point a is the rotation axis of the tooth lifting shaft 14, point B is the axis of the outer circumference circle of the eccentric cylinder part 7-1, i.e. the center of the inner hole of the eccentric sleeve 10, point C is the axis of the outer circumference circle of the eccentric sleeve 10, i.e. the hinged center point of the lower end of the tooth lifting connecting rod 12, and the distance between point a and point C is the tooth lifting eccentricity. During normal work, the feed lifting shaft 14 drives the compressing component and the adjusting disk 13 to synchronously rotate, friction force is arranged between the adjusting disk 13 and the eccentric sleeve 10, the friction force is reasonably set according to actual conditions, the adjusting disk 13 can drive the eccentric sleeve 10 to synchronously rotate through the friction force, similarly, friction force is arranged between the eccentric sleeve 10 and the eccentric cylinder part 7-1 for adjusting the eccentricity 7, the friction force is reasonably set according to actual conditions, the eccentric sleeve 10 can drive the adjusting eccentricity 7 to synchronously rotate through the friction force, the adjusting disk 13, the eccentric sleeve 10 and the adjusting eccentricity 7 are circumferentially fixed, the feed lifting shaft 14 synchronously rotates, and at the moment, see fig. 5, namely, the positions of a point A, a point B and a point C are fixed mutually. The tooth lifting shaft 14 drives the adjusting eccentric 7 to rotate, so that the swing rod AB can be simplified, the eccentric sleeve 10 is driven to rotate when the tooth lifting shaft 14 rotates, the swing rod AC can be simplified, a kinematic chain of the tooth lifting mechanism is simplified, as shown in figure 6, the swing rod AC rotates through the rotation of the tooth lifting shaft 14, and the tooth lifting connecting rod 12 drives the tooth rack 2 to swing up and down, so that tooth lifting action is realized. When the height of the tooth 3 needs to be adjusted, the adjusting eccentric 7 is locked by operating the locking component 8, the adjusting eccentric 7 does not rotate in the circumferential direction any more, then the feed lifting shaft 14 is rotated to drive the pressing component and the adjusting disc 13 to rotate synchronously, the adjusting disc 13 drives the eccentric sleeve 10 to overcome the friction between the eccentric sleeve 10 and the shoulder part 7-2 of the adjusting eccentric 7 through the side edge of the adjusting chute 13-1 and the friction, and under the limitation of the adjusting chute 13-1, the eccentric sleeve 10 slides along the length of the adjusting chute 13-1 for small-segment displacement, so that the eccentric sleeve 10 relatively rotates on the eccentric cylinder part 7-1 of the adjusting eccentric 7, see fig. 7, namely the swing rod AB rotates, the adjusting chute 13-1 drives the swing rod CB to rotate, ABC changes, and the point C displaces one end distance along the length direction of the adjusting chute 13-1, the length of the swing rod AC is changed, namely the eccentricity of the lifting tooth is changed; after the swing rod AC reaches a required value, the locking assembly 8 is released, the tooth lifting shaft 14, the adjusting eccentric 7 and the eccentric sleeve 10 return to the circumferential mutually fixed state and return to the working state again, and the amplitude of the tooth lifting connecting rod 12 driving the tooth frame 2 to swing up and down is changed due to the change of the tooth lifting eccentric amount, so that the height of the teeth 3 is adjusted. The utility model discloses a lifting teeth mechanism can adjust the height of tooth 3 as required in a flexible way to easy operation, stable in structure is reliable.

Referring to fig. 1 to 7, the present invention is further described below with a specific embodiment:

in the present embodiment, referring to fig. 1, 2 and 3, the feed lifting rock shaft 14 is flexibly and rotatably mounted on the bottom plate 1, the axial direction of the feed lifting rock shaft 14 is the left-right direction, the right end of the feed lifting rock shaft 14 is connected to the feed lifting rock motor 16, and preferably, a hand wheel 17 is fixed on the feed lifting rock shaft 14 outside the feed lifting rock motor 16, and during adjustment, the feed lifting rock shaft 14 can be adjusted to rotate by rotating the motor, and can also be manually rotated by the hand wheel 17. The upper end of the feed lifting connecting rod 12 is hinged with one end of the tooth rack 2 through a hinge shaft, and the lower end is sleeved on the eccentric sleeve 10 through a needle bearing 11.

In the present exemplary embodiment, the side of the adjusting disk 13 remote from the adjusting gate 13-1 has two threaded holes arranged circumferentially, in the present exemplary embodiment the adjusting disk 13 is fastened to the lifting-teeth shaft 14 by means of two screws.

In the embodiment, referring to fig. 2 and 3, as a preferred design, the pressing assembly comprises a pressing nut 5 fixedly screwed on the feed lifting rock shaft 14 and a butterfly gasket 6 arranged between the pressing block and the adjusting eccentric 7, the butterfly gasket 6 is sleeved on the feed lifting rock shaft 14, the pressing nut 5 is screwed on a threaded section 14-1 at the left end of the feed lifting rock shaft 14, so that the installation and the pressing force adjustment are convenient, the pressing block presses the butterfly gasket 6 on the left side of the adjusting eccentric 7, and the adjusting disc 13 is positioned on the right side of the adjusting eccentric 7. Preferably, the butterfly washer 6 is in frictional contact with the adjusting eccentric 7, and the feed lifting mechanism can provide a driving force for rotating the adjusting eccentric 7 through a frictional force between the pressing assembly and the adjusting eccentric 7 instead of the frictional force between the adjusting disc 13 and the adjusting eccentric 7 during normal operation. Of course, in other embodiments, the pressing assembly may have other suitable structures, and the axial pressure applied to the adjusting eccentric 7 may be implemented.

In this embodiment, referring to fig. 3 and 4, as an optimal design, an arc-shaped limiting groove 7-3 is formed in a shoulder portion 7-2 of the adjusting eccentric 7, a limiting pin 9 is installed on the eccentric sleeve 10, one end of the limiting pin 9 is inserted into the eccentric sleeve 10, and the other end of the limiting pin extends into the limiting groove 7-3, when the eccentric sleeve 10 rotates relative to the adjusting eccentric 7, the limiting pin 9 slides in the limiting groove 7-3, and the rotating range of the eccentric sleeve 10 relative to the adjusting eccentric 7 is limited by the positions of two end portions of the limiting groove 7-3, so that the adjusting range of the swing rod AC is limited, and the adjusting range of the height of the teeth 3 is limited finally.

In the embodiment, referring to fig. 3 and 4, the adjusting eccentric 7 is provided with a locking groove 7-4, the locking groove 7-4 is specifically arranged on the circumferential surface of the shoulder part 7-2, the locking assembly 8 comprises a locking member matched with the locking groove 7-4, the locking member is arranged on the bottom plate 1 of the sewing machine, and the locking member can move on the bottom plate 1 and be inserted into or separated from the locking groove 7-4, so that the adjusting eccentric 7 cannot rotate, and circumferential locking is realized. In the present embodiment, the lock assembly 8 includes both a manual control type and a power control type.

The locking assembly 8 of the manual control type is shown in fig. 5, and the locking member is a button shaft 83 and is provided with an elastic restoring structure for automatically restoring the locking member. And the button shaft 83 can move on the bottom plate 1 along the axial direction, the locking assembly 8 further comprises a limiting snap spring 81, the limiting snap spring 81 can be installed on the bottom plate 1, the limiting snap spring 81 aims to limit the position of the button shaft 83 when the button shaft 83 is close to the eccentric 7, the elastic reset structure comprises a reset spring 82, the reset spring 82 is sleeved on the button shaft 83, one end of the reset spring 82 is abutted or connected with the head of the button shaft 83, and the other end of the reset spring is abutted or connected with the limiting snap spring 81. When the height of the tooth 3 needs to be adjusted, the rotary feed lifting shaft 14 drives the adjusting eccentric 7 to rotate until the locking groove 7-4 is aligned with the button shaft 83, then the button shaft 83 is pressed to move towards the adjusting eccentric 7 to be inserted into the locking groove 7-4 and abut against the limiting clamp spring 81, the button shaft 83 is limited from moving excessively, and when the button shaft 83 is inserted into the locking groove 7-4, the rotation of the adjusting eccentric 7 is limited, so that the circumferential locking of the adjusting eccentric 7 is realized. After the adjustment is completed, the pressing is released, and the button shaft 83 is automatically returned by the return spring 82, thereby releasing the circumferential locking of the rotation of the adjustment eccentric 7. Of course, in other embodiments, the locking assembly 8 may also adopt other forms of structures, and the circumferential locking of the adjusting eccentric 7 can be realized.

When the locking component 8 is electrically controlled, the locking component 8 is connected with an electric control system of the sewing machine, and the electric control system controls the locking and unlocking actions of the locking component 8. Specifically, referring to fig. 8, the locking assembly 8 includes a main body housing 85, an iron core 84, a limiting spring 86, and an iron core limiting cover plate 87, wherein a coil is wound on the main body housing 85, and the coil is controlled by an electric control system to be turned on or off, the main body housing 85 is fixedly mounted on the base plate 1, the iron core 84 is a locking member and flexibly penetrates through the main body housing 85, the head of the iron core 84 faces the adjusting eccentric 7 and can be inserted into the locking groove 7-4, the iron core 84 can move axially along the iron core 84 and is close to or away from the adjusting eccentric 7, the limiting spring 86 is sleeved on the tail end of the iron core 84, the iron core limiting cover plate 87 is fixedly mounted on the base plate 1 and is located at the tail end side of the iron core 84, one end of the limiting spring 86 abuts against the main body housing 85, the other end of the limiting spring abuts against the iron core 84, and the limiting spring 86 exerts an elastic force on the iron core 84, which faces the iron core limiting cover plate 87. Under the condition that a coil on the main body shell 85 is not electrified, the tail of the iron core 84 abuts against the iron core limiting cover plate 87 for limiting under the action of the limiting spring 86, at the moment, the iron core 84 leaves the locking groove 7-4 for adjusting the eccentricity 7, when the coil on the main body shell 85 is electrified, the iron core 84 is under the action of electromagnetic force, overcomes the spring force, moves towards the adjustment eccentricity 7 until the shaft shoulder of the iron core 84 abuts against the main body shell 85, and at the moment, the head of the iron core 84 is inserted into the locking groove 7-4, so that the circumferential locking of the adjustment eccentricity 7 is realized. Further, preferably, a sensor may be provided to detect the stroke of the iron core 84 and then feed back a signal to the electronic control system, whereby it is possible to automatically determine whether the locking and unlocking are achieved.

Of course, the locking assembly 8 of the present invention is not limited to the two specific examples, and in other embodiments, other suitable structures may be adopted, so as to achieve circumferential locking of the adjusting eccentric 7, and not affect the normal operation of the tooth lifting mechanism.

The utility model discloses in, locking Assembly 8 uses electric control as preferred design to this whole accommodation process can realize full automatic control, and degree of automation is high, and is accurate high-efficient.

Therefore, the tooth lifting mechanism of the utility model can realize the height adjustment of the teeth 3 by simple operation, and has the advantages of simple operation, flexible adjustment, reliable movement and good adaptability; can satisfy sewing machine's multiple sewing needs, when making thin material, reduce 3 high can improve the seam material phenomenon of wrinkling of tooth, when making thick material and cross the stalk sewing, heighten 3 high effective work feed efficiency that can improve of tooth for the work feed is more smooth and easy.

To sum up, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may 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. A tooth lifting mechanism with adjustable tooth height comprises a tooth lifting shaft (14) and a tooth lifting connecting rod (12), and is characterized in that: the eccentric adjusting mechanism is characterized by further comprising an adjusting eccentric (7), an eccentric sleeve (10), a pressing assembly, an adjusting disc (13) and a locking assembly (8), wherein the adjusting eccentric (7) is provided with an eccentric cylinder part (7-1) which is rotatably sleeved on the feed lifting shaft (14) and a shoulder part (7-2) which is fixed at one end of the eccentric cylinder part (7-1), the eccentric sleeve (10) is rotatably sleeved on the eccentric cylinder part (7-1), one end of the eccentric sleeve (10) is in friction contact with the end face of the shoulder part (7-2), the adjusting disc (13) is fixed on the feed lifting shaft (14) and is positioned at the other end of the eccentric sleeve (10), an adjusting sliding groove (13-1) which is matched with the eccentric sleeve (10) is arranged on the side face of the adjusting disc (13), one end, facing the eccentric sleeve (10), of the eccentric sleeve (10) is clamped in the adjusting sliding groove (13-1), The end surface of the tooth lifting connecting rod is in frictional contact with the bottom surface of the adjusting chute (13-1), one end of the tooth lifting connecting rod (12) is rotatably sleeved on the eccentric sleeve (10), and the other end of the tooth lifting connecting rod is hinged with the tooth rack (2); the pressing component is fixed on the feed lifting shaft (14) and applies axial pressure to the adjusting eccentric (7), so that the pressing is kept between the adjusting eccentric (7) and the eccentric sleeve (10) and between the eccentric sleeve (10) and the adjusting disc (13) in the axial direction; the locking assembly (8) is used for locking and adjusting the circumferential position of the eccentric (7).

2. The tooth lifting mechanism of claim 1, wherein: the pressing assembly comprises a pressing nut (5) and a butterfly gasket (6), the pressing nut (5) is screwed on the feed lifting shaft (14), the butterfly gasket (6) is pressed on the adjusting eccentric (7) through the pressing nut (5), and the butterfly gasket (6) and the adjusting disc (13) are respectively located at two ends of the adjusting eccentric (7).

3. The tooth lifting mechanism of claim 1, wherein: an arc-shaped limiting groove (7-3) is formed in a shoulder part (7-2) of the eccentric adjusting sleeve (7), a limiting pin (9) is installed on the eccentric sleeve (10), the limiting pin (9) is located in the limiting groove (7-3), and the limiting pin (9) slides in the limiting groove (7-3) when the eccentric sleeve (10) rotates relative to the eccentric adjusting sleeve (7).

4. The tooth lifting mechanism of claim 1, wherein: the adjusting eccentric mechanism is characterized in that a locking groove (7-4) is formed in the adjusting eccentric mechanism (7), the locking assembly (8) comprises a locking piece matched with the locking groove (7-4), the locking piece is movably arranged on the bottom plate (1) of the sewing machine, and the locking piece can be inserted into or fall off the locking groove (7-4).

5. The tooth lifting mechanism of claim 4, wherein: the locking assembly (8) further comprises a resilient return structure acting on the locking member.

6. The tooth lifting mechanism of claim 4, wherein: the retaining member is iron core (84), locking Assembly (8) still include fixed mounting's main body cover (85) and spacing spring (86), the winding has the coil on main body cover (85), iron core (84) are worn to establish in main body cover (85) in a flexible way, spacing spring (86) are used in iron core (84), and to the elasticity of iron core (84) along the direction of keeping away from locking groove (7-4).

7. The tooth lifting mechanism of claim 1, wherein: the locking assembly (8) is connected with an electric control system of the sewing machine, and the electric control system controls the locking action and the unlocking action of the locking assembly (8).

8. The tooth lifting mechanism of claim 1, wherein: the feed lifting shaft (14) is driven in the circumferential direction by a feed lifting driving source.

9. The tooth lifting mechanism of claim 8, wherein: the tooth lifting driving source is a motor.

10. The tooth lifting mechanism of claim 1, wherein: also comprises a hand wheel (17) fixed on the feed lifting rock shaft (14).

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