阅读说明：本技术 偏心可调装置、缝纫机的抬牙驱动机构及缝纫机 (Eccentric adjustable device, lifting tooth driving mechanism of sewing machine and sewing machine ) 是由 朱赛瑞 芈韶雷 徐永明 赵林蔚 于 2019-09-19 设计创作，主要内容包括：本发明提供一种偏心可调装置、缝纫机的抬牙驱动机构及缝纫机,其包括：偏心组件包括调节套和偏心调节部,偏心调节部与主轴径向固定相连,偏心调节部上具有沿主轴轴向延伸的调节作用面,调节作用面的中心线与主轴的轴线成一定角度,调节套和偏心调节部可在主轴的轴向上相对滑动、且调节套与调节作用面滑动接触,调节套与所述调节作用面滑动接触的表面中心线与主轴的轴线形成所述一定角度；调节组件带动调节套和偏心调节部中的一个沿主轴滑动,改变调节套与偏心调节部在主轴轴向上的相对位置,进而改变调节套的外周面中心线相对主轴轴线的偏心量。本发明的偏心量可调,可以满足不同厚度的面料对应不同偏心量的需求。(The invention provides an eccentric adjustable device, a feed lifting driving mechanism of a sewing machine and the sewing machine, comprising: the eccentric assembly comprises an adjusting sleeve and an eccentric adjusting part, the eccentric adjusting part is fixedly connected with the main shaft in the radial direction, an adjusting action surface extending along the axial direction of the main shaft is arranged on the eccentric adjusting part, the central line of the adjusting action surface forms a certain angle with the axis of the main shaft, the adjusting sleeve and the eccentric adjusting part can relatively slide in the axial direction of the main shaft, the adjusting sleeve is in sliding contact with the adjusting action surface, and the central line of the surface of the adjusting sleeve in sliding contact with the adjusting action surface forms the certain angle with the axis of the main shaft; the adjusting component drives one of the adjusting sleeve and the eccentric adjusting part to slide along the main shaft, the relative position of the adjusting sleeve and the eccentric adjusting part in the axial direction of the main shaft is changed, and the eccentric amount of the central line of the outer peripheral surface of the adjusting sleeve relative to the axis of the main shaft is further changed. The eccentric amount of the invention is adjustable, and the requirements of fabrics with different thicknesses corresponding to different eccentric amounts can be met.)

1. An eccentrically adjustable device, comprising:

a main shaft is arranged on the main shaft,

the eccentric assembly comprises an adjusting sleeve and an eccentric adjusting part, the eccentric adjusting part is fixedly connected with the main shaft in the radial direction, an adjusting action surface extending along the axial direction of the main shaft is arranged on the eccentric adjusting part, the central line of the adjusting action surface forms a certain angle with the axis of the main shaft, the adjusting sleeve and the eccentric adjusting part can relatively slide in the axial direction of the main shaft, the adjusting sleeve is in sliding contact with the adjusting action surface, and the central line of the surface of the adjusting sleeve in sliding contact with the adjusting action surface forms the certain angle with the axis of the main shaft;

and the adjusting assembly drives one of the adjusting sleeve and the eccentric adjusting part to slide along the main shaft, so that the relative position of the adjusting sleeve and the eccentric adjusting part in the axial direction of the main shaft is changed, and the eccentric amount of the central line of the peripheral surface of the adjusting sleeve relative to the axis of the main shaft is further changed.

2. The eccentrically adjustable device of claim 1, wherein: the eccentric adjusting part is a sleeve-shaped part sleeved on the main shaft, the sleeve-shaped part and the main shaft axially slide and are radially positioned and connected, and the central line of an inner hole of the sleeve-shaped part is collinear with the axis of the main shaft; one end of the sleeve-shaped part is connected with the adjusting component, the outer peripheral surface of the other end of the sleeve-shaped part is provided with the adjusting action surface, and the adjusting sleeve is sleeved at the other end of the sleeve-shaped part.

3. The eccentrically adjustable device of claim 2, wherein: the adjusting action surface is the whole peripheral surface of the other end of the sleeve-shaped part, and the central line of the adjusting action surface is the central line of the peripheral surface of the other end of the sleeve-shaped part.

4. The eccentrically adjustable device of claim 2, wherein: the adjusting action surface is a pair of inclined planes which are parallel to each other and are positioned on the outer surface of the other end of the sleeve-shaped part, and the inclined planes and the axis of the main shaft form the certain angle.

5. The eccentrically adjustable device of claim 2, wherein: the adjusting component comprises an adjusting shifting fork, an annular groove is formed in the circumferential direction of one end of the sleeve-shaped part, and a fork opening of the adjusting shifting fork is located in the annular groove.

6. The eccentrically adjustable device of claim 1, wherein: the eccentric adjusting part comprises a first sliding surface arranged on the outer surface of the main shaft and a second sliding surface protruding out of the inner wall of the adjusting sleeve, the first sliding surface and the second sliding surface are in sliding contact in the axial direction of the main shaft, and the first sliding surface and the second sliding surface form a certain angle with the axis of the main shaft; the adjusting sleeve is connected with the adjusting component and is fixedly connected with the main shaft in the radial direction, and the adjusting sleeve slides in the axial direction under the driving of the adjusting component to change the relative position of the adjusting sleeve and the first sliding surface in the axial direction of the main shaft.

7. The eccentrically adjustable device of claim 6, wherein: two opposite mounting grooves are formed in the inner wall of the adjusting sleeve, a follow-up sliding block is fixed in each mounting groove, and the lower surface of each follow-up sliding block forms a second sliding surface; the spindle is embedded with two sliding seats which are oppositely arranged, the upper surfaces of the sliding seats form the first sliding surface, and the sliding seats are embedded in the corresponding mounting grooves in a sliding manner.

8. The eccentrically adjustable device of claim 6, wherein: the adjusting component comprises an adjusting shifting fork, an annular groove is circumferentially arranged at one end of the adjusting sleeve, and a fork opening of the adjusting shifting fork is located in the annular groove.

9. The utility model provides a sewing machine's feed lifting tooth actuating mechanism, includes feed lifting tooth frame and the feed lifting tooth subassembly that links to each other with feed lifting tooth frame, be equipped with on the feed lifting tooth frame along feed lifting tooth frame length direction gliding feed lifting tooth slider, the feed lifting tooth slider is worn to establish on the sewing machine axle, its characterized in that: the eccentric adjustable device of any one of claims 1 to 8, wherein the main shaft is used as the sewing machine shaft, the adjusting sleeve is arranged between the tooth lifting slide block and the main shaft and fixedly connected with the tooth lifting slide block in the axial direction of the main shaft, and when the eccentric amount of the adjusting sleeve relative to the main shaft is changed, the eccentric amount between the central line of the tooth lifting slide block and the axial line of the sewing machine shaft is changed.

10. The feed dog driving mechanism of a sewing machine according to claim 9, wherein: the adjusting component comprises an adjusting block which is arranged outside the sewing machine shell and can be locked with the sewing machine shell, and an adjusting shifting fork which is arranged in a sliding groove on the sewing machine shell in a penetrating mode, wherein the shaft end of the adjusting shifting fork is connected with the adjusting block and slides along the sliding groove under the driving of the adjusting block, and the fork end of the adjusting shifting fork is connected with one of the adjusting sleeve and the eccentric adjusting part.

11. A sewing machine characterized by: the sewing machine has an eccentric adjustable device as claimed in any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of sewing machines, in particular to an eccentric adjustable device, a feed lifting driving mechanism of a sewing machine and the sewing machine.

Background

The feed lifting mechanism of the sewing machine is used for driving the teeth to move up and down to match with sewing. The existing sewing machine uses a main shaft as a power source and simultaneously an eccentric shaft section is arranged on the main shaft, the eccentric shaft section is fixed in eccentricity and cannot be adjusted, and the eccentric shaft section drives a tooth lifting slide block so as to drive a tooth rack in a tooth lifting mechanism to move up and down. When sewing fabrics with different thicknesses, the overedger with the main shaft with the lifting tooth slide block sections with different eccentric amounts (namely, the lifting tooth eccentric amount corresponds to the overedger) needs to be selected according to the thickness types of the fabrics, so that the sewing machine with the lifting tooth eccentric amount can only sew fabrics with one thickness type, and the function is narrow.

Therefore, an eccentric amount adjustable device is needed, which can adjust the eccentric amount of the driving tooth frame on the existing spindle according to different thicknesses of fabrics, and realize that one sewing machine can sew fabrics with different thicknesses.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an eccentric adjustable device, a feed dog driving mechanism of a sewing machine, and a sewing machine, which are used to solve the problem of the prior art that the eccentric amount on the main shaft is fixed and cannot be adjusted.

To achieve the above and other related objects, the present invention provides an eccentric adjustable device, comprising:

a main shaft is arranged on the main shaft,

the eccentric assembly comprises an adjusting sleeve and an eccentric adjusting part, the eccentric adjusting part is fixedly connected with the main shaft in the radial direction, an adjusting action surface extending along the axial direction of the main shaft is arranged on the eccentric adjusting part, the central line of the adjusting action surface forms a certain angle with the axis of the main shaft, the adjusting sleeve and the eccentric adjusting part can relatively slide in the axial direction of the main shaft, the adjusting sleeve is in sliding contact with the adjusting action surface, and the central line of the surface of the adjusting sleeve in sliding contact with the adjusting action surface forms the certain angle with the axis of the main shaft;

and the adjusting assembly drives one of the adjusting sleeve and the eccentric adjusting part to slide along the main shaft, so that the relative position of the adjusting sleeve and the eccentric adjusting part in the axial direction of the main shaft is changed, and the eccentric amount of the central line of the peripheral surface of the adjusting sleeve relative to the axis of the main shaft is further changed.

Preferably, the eccentric adjusting part is a sleeve-shaped part sleeved on the main shaft, the sleeve-shaped part and the main shaft axially slide and are radially positioned and connected, and the central line of an inner hole of the sleeve-shaped part is collinear with the axis of the main shaft; one end of the sleeve-shaped part is connected with the adjusting component, the outer peripheral surface of the other end of the sleeve-shaped part is provided with the adjusting action surface, and the adjusting sleeve is sleeved at the other end of the sleeve-shaped part.

Preferably, the adjusting action surface is the whole peripheral surface of the other end of the sleeve-shaped member, and the central line of the adjusting action surface is the central line of the peripheral surface of the other end of the sleeve-shaped member.

Preferably, the adjustment action surface is a pair of inclined planes parallel to each other on the outer surface of the other end of the sleeve, and the inclined planes form the certain angle with the axis of the main shaft.

Preferably, the adjusting component comprises an adjusting shifting fork, an annular groove is circumferentially arranged at one end of the sleeve-shaped part, and a fork opening of the adjusting shifting fork is located in the annular groove.

Preferably, the eccentric adjustment part comprises a first sliding surface arranged on the outer surface of the spindle and a second sliding surface protruding out of the inner wall of the adjustment sleeve, the first sliding surface and the second sliding surface are in sliding contact in the axial direction of the spindle, and the first sliding surface and the second sliding surface form the certain angle with the axis of the spindle; the adjusting sleeve is connected with the adjusting component and is fixedly connected with the main shaft in the radial direction, and the adjusting sleeve slides in the axial direction under the driving of the adjusting component to change the relative position of the adjusting sleeve and the first sliding surface in the axial direction of the main shaft.

Preferably, the inner wall of the adjusting sleeve is provided with two opposite mounting grooves, a follow-up slider is fixed in each mounting groove, and the lower surface of each follow-up slider forms the second sliding surface; the spindle is embedded with two sliding seats which are oppositely arranged, the upper surfaces of the sliding seats form the first sliding surface, and the sliding seats are embedded in the corresponding mounting grooves in a sliding manner.

Preferably, the adjusting component comprises an adjusting shifting fork, an annular groove is circumferentially arranged at one end of the adjusting sleeve, and a fork opening of the adjusting shifting fork is located in the annular groove.

The invention also provides a feed lifting tooth driving mechanism of the sewing machine, which comprises a feed lifting tooth frame and a feed lifting tooth assembly connected with the feed lifting tooth frame, wherein a feed lifting tooth sliding block sliding along the length direction of the feed lifting tooth frame is arranged on the feed lifting tooth frame, the feed lifting tooth sliding block is arranged on a sewing machine shaft in a penetrating manner, the feed lifting tooth driving mechanism also comprises the eccentric adjustable device, the main shaft is used as the sewing machine shaft, the adjusting sleeve is sleeved between the feed lifting tooth sliding block and the main shaft, the adjusting sleeve is fixedly connected with the feed lifting tooth sliding block in the axial direction of the main shaft, and when the eccentric amount of the adjusting sleeve relative to the main shaft is changed, the eccentric amount between the central line of the feed lifting tooth sliding block and the axial line of the sewing machine shaft is changed along with the feed.

Preferably, the adjusting part is including arranging the adjusting block that the sewing machine casing is outer and can lock with the sewing machine casing in to and wear to establish the regulation shift fork in the spout on the sewing machine casing, the axle head of adjusting the shift fork links to each other with the adjusting block and slides along the spout under the drive of adjusting block, the fork end of adjusting the shift fork with the adjusting collar with one in the eccentric regulation portion links to each other.

The invention also provides a sewing machine, which is provided with the eccentric adjustable device.

As described above, the eccentric adjustable device, the feed lifting driving mechanism of the sewing machine and the sewing machine of the invention have the following beneficial effects: the eccentric adjusting part is provided with an adjusting action surface which forms a certain angle with the axis of the main shaft, the central line of an inner hole of the adjusting sleeve forms a certain angle with the axis of the main shaft, the adjusting sleeve and the eccentric adjusting part slide relatively, the relative axial position of the adjusting sleeve and the eccentric adjusting part is adjusted to change the eccentric amount of the central line of the outer peripheral surface of the adjusting sleeve relative to the axis of the main shaft, so that the adjustability of the eccentric amount of the adjusting sleeve relative to the main shaft is realized, the eccentric adjusting device can be used for a tooth lifting driving mechanism, the requirements of fabrics with different thicknesses corresponding to different eccentric amounts are met, and even one sewing machine meets the sewing requirements of fabrics with.

Drawings

FIG. 1 is a diagram of an embodiment of the eccentric adjustable device of the present invention.

Fig. 2 is a view showing an embodiment of the sleeve of the present invention.

Fig. 3 shows a schematic diagram of the eccentricity of the sleeve of the present invention.

Fig. 4 is a schematic view of another embodiment of the eccentric adjustable device of the present invention.

Fig. 5 shows a partial cross-sectional view of the eccentrically adjustable means of fig. 4.

FIG. 6 is a schematic view showing a part of the mechanism of the sewing machine housing of the present invention.

Description of the element reference numerals

1 Sleeve like element

101 ring groove

102 at the other end of the sleeve

2 limiting pin

3. 8 screw

4 slider front cover

5 adjusting sleeve

6 lifting tooth slide block

7 slider back cover

9 Main shaft

9A long groove

10 lifting tooth rack

11 adjusting shifting fork

11B adjusting block

11A fork mouth part

12 oil seal

13 Sewing machine casing

13A chute

13B oil seal chute

14 adjusting block

21. 25 spacing pin

22 adjusting sleeve

23. 28 follow-up sliding block

24. 27 sliding seat

26 spindle

Detailed Description

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

Please refer to fig. 1 to 6. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

For convenience of description, in the present specification, a direction in which the spindle axis extends is referred to as a front-rear direction, a direction perpendicular to the spindle axis is referred to as an up-down direction, and a cross section passing through the spindle axis is referred to as an axial cross section. The sewing machine mainly comprises a main shaft as a total power source, wherein a plurality of eccentric parts with different eccentric amounts are generally arranged on the main shaft and connected with a feed lifting tooth connecting rod, a cloth feeding connecting rod and other mechanisms to realize transmission of various functions, so that the movement of the cloth feeding tooth in a three-dimensional space is realized, and sewing is completed. In order to facilitate adjustment, the sewing machine of the invention adopts an eccentric adjustable device as an eccentric part to be connected with a feed lifting tooth connecting rod and a cloth feeding connecting rod.

As shown in fig. 1 to 6, the present invention mainly provides an eccentric adjustable device, which includes:

the main shafts 9, 26 are provided with,

the eccentric assembly comprises adjusting sleeves 5 and 22 and an eccentric adjusting part, the eccentric adjusting part is fixedly connected with the main shafts 9 and 26 in the radial direction, an adjusting acting surface extending along the axial direction of the main shafts 9 and 26 is arranged on the eccentric adjusting part, and the central line of the adjusting acting surface forms a certain angle (see an included angle theta in figure 2) with the axial lines of the main shafts 9 and 26; the adjusting sleeve 5, 22 and the eccentric adjusting part can relatively slide in the axial direction of the main shaft 9, 26, the adjusting sleeve 5, 22 is in sliding contact with the adjusting acting surface, and the surface center line of the adjusting sleeve 5, 22 in sliding contact with the adjusting acting surface forms the certain angle with the axis of the main shaft 9, 26;

and the adjusting assembly drives one of the adjusting sleeves 5 and 22 and the eccentric adjusting part to slide along the main shafts 9 and 26, so that the relative positions of the adjusting sleeves 5 and 22 and the eccentric adjusting part in the axial directions of the main shafts 9 and 26 are changed, and further the eccentric amount of the central lines of the peripheral surfaces of the adjusting sleeves 5 and 22 relative to the axis of the main shafts is changed.

The eccentric adjusting part of the invention is provided with an adjusting action surface which forms a certain angle with the axial line of the main shaft 9 and 26, the surface central line of the sliding contact of the adjusting sleeve 5 and 22 and the adjusting action surface forms the certain angle with the axial line of the main shaft 9 and 26, so that the central line of the peripheral surface of the adjusting sleeve 5 and 22 is parallel with the axial line of the main shaft 9 and 26, the relative sliding of the adjusting sleeve 5 and 22 and the eccentric adjusting part is realized, the eccentric amount of the peripheral surface central line of the adjusting sleeve 5 and 22 relative to the axial line of the main shaft 9 and 26 is changed by adjusting the relative axial position of the adjusting sleeve and the eccentric adjusting part, and the eccentricity adjusting device can be used for a tooth lifting driving mechanism and a cloth feeding driving mechanism, so as to meet the requirements of different thicknesses of fabrics corresponding to different eccentricity, even if one sewing machine meets the sewing of fabrics with different thicknesses.

As an embodiment of the eccentric assembly

As shown in fig. 1 to fig. 3, in the present embodiment, the eccentric adjustment portion is a sleeve-shaped member 1 sleeved on the main shaft 9, the sleeve-shaped member 1 is axially slid and radially positioned and connected with the main shaft 9, and a central line of an inner hole of the sleeve-shaped member 1 is collinear with an axis of the main shaft 9; one end of the sleeve-shaped part 1 is connected with the adjusting component, the other end peripheral surface of the sleeve-shaped part 1 is provided with the adjusting action surface S1, and the adjusting sleeve 5 is sleeved on the other end of the sleeve-shaped part 1. In the embodiment, the sleeve-shaped member 1 is used as an eccentric adjusting part, the radial fixing and the axial sliding of the sleeve-shaped member 1 and the main shaft 9 are realized by matching the radially extending limit pin 2 with the axially extending long groove 9A of the main shaft 9, when the main shaft 9 rotates, the sleeve-shaped member 1 is driven to rotate, and the adjusting component can drive the sleeve-shaped member 1 to axially slide along the main shaft.

In order to achieve better adjustment of the eccentricity, the adjustment acting surface S1 in this embodiment is the entire outer peripheral surface of the other end 102 of the sleeve, and as shown in fig. 2, the center line L1 of the adjustment acting surface S1 is the rotation center line of the outer peripheral surface of the other end of the sleeve 1. That is, the adjusting action surface S1 is a circumferential surface in this embodiment, as shown in fig. 2 and fig. 3, the center line L1 of the adjusting action surface S1 intersects with the center line L2 of the central hole of the sleeve-shaped member to form an included angle θ, and the center line of the inner hole of the adjusting sleeve 5 intersects with the center line of the outer circumferential surface of the adjusting sleeve 5 to form an included angle θ, even if the center line of the outer circumferential surface of the adjusting sleeve 5 is parallel to the center line L2 of the central hole of the sleeve-shaped member; therefore, the distance between the axis of the outer circumferential surface of the adjusting sleeve 5 and the axis of the inner hole of the sleeve-shaped part 1 is different when the adjusting sleeve 5 is positioned at different positions at the other end of the sleeve-shaped part 1. That is, when the adjusting sleeve 5 and the sleeve-shaped member 1 move axially relatively, the eccentricity of the adjusting sleeve 5 relative to the main shaft 9 changes, specifically: when the adjusting sleeve 5 is located at the axial position a1 of the adjusting action surface S1, the eccentric amount of the axial position a1 corresponding to the center line a11 of the outer peripheral surface of the adjusting sleeve and the center line L2 of the central hole of the sleeve is d 1; the sleeve-shaped element 1 is axially adjusted, so that the adjusting sleeve 5 is located at the axial position a2 of the adjusting action surface S1, the eccentricity between the central line a21 of the outer peripheral surface of the adjusting sleeve at the axial position a2 and the central line L2 of the central hole of the sleeve-shaped element is d2, and as can be seen from fig. 3, the eccentricity d2 is smaller than the eccentricity d1, that is, the adjustment of the eccentricity of the adjusting sleeve 5 relative to the main shaft 9 is completed by the sleeve-shaped element 1.

In this embodiment, the adjustment action surface S1 may be a pair of inclined planes (not shown) parallel to each other on the outer surface of the other end 102 of the sleeve, the inclined planes forming an angle with the axis of the main shaft (i.e., the included angle θ), and the center line of the adjustment action surface is defined as: in an axial section through the spindle axis (referred to as axial section), the section lines of the two inclined planes are the symmetry center lines in the axial section. The adjustment surface S1 may also be an inclined plane on the outer surface of the other end 102 of the sleeve and a circumferential arc surface matching the inclined plane, and the center line of the adjustment surface is defined as: and in an axial section passing through the axis of the main shaft, a section line of the inclined plane and a section line of the circumferential cambered surface are symmetrical center lines in the axial section. That is, the adjustment acting surface S1 is not limited to the entire outer peripheral surface of the sleeve 1, but may be an inclined surface extending in the axial direction on the outer peripheral surface of the sleeve 1, and the eccentricity of the adjustment sleeve can be changed only by allowing the adjustment sleeve to move in the axial direction relative to the sleeve. In order to realize the axial sliding of the sleeve-shaped member 1, the adjusting assembly in this embodiment includes an adjusting fork 11, an annular groove 101 is circumferentially disposed at one end of the sleeve-shaped member 1, a fork opening portion 11A of the adjusting fork 11 is located in the annular groove 101, and the fork opening portion 11A is located in the annular groove 101, so that the sleeve-shaped member 1 can be driven to axially slide along the spindle 9.

Another embodiment as an eccentric assembly

As shown in fig. 4 and 5, in the present embodiment, the eccentric adjustment portion includes a first sliding surface S2 disposed on the outer surface of the main shaft and a second sliding surface S3 protruding from the inner wall of the adjustment sleeve 22, the first sliding surface S2 and the second sliding surface S3 are in sliding contact with each other in the axial direction of the main shaft 26, and the first sliding surface S2 and the second sliding surface S3 both form the certain angle with the axis of the main shaft 26; the adjusting sleeve 22 is connected with the adjusting assembly and is fixedly connected with the main shaft 26 in the radial direction, and the adjusting sleeve 22 slides in the axial direction under the driving of the adjusting assembly, so that the relative position of the adjusting sleeve 22 and the first sliding surface S2 in the axial direction of the main shaft 26 is changed. In the present embodiment, the first sliding surface S2 is matched with the second sliding surface S3, so that different eccentric amounts are generated at different axial positions of the adjusting sleeve 22 relative to the main shaft 26.

The specific implementation can be as follows: two opposite mounting grooves are formed in the inner wall of the adjusting sleeve 22, a follow-up slider 23 and a follow-up slider 28 are fixed in each mounting groove, and the lower surfaces of the follow-up sliders 23 and 28 form a second sliding surface S3; the main shaft 26 is embedded with two opposite sliding seats 24 and 27, the upper surfaces of the sliding seats 24 and 27 form the first sliding surface S2, and the sliding seats 24 and 27 are embedded in the corresponding mounting grooves in a sliding manner. In the embodiment, the sliding seats 24 and 27 are fixed on the main shaft 26 and are embedded in the mounting grooves, so that the radial positioning of the adjusting sleeve 22 relative to the main shaft 26 is realized, and when the main shaft 26 rotates, the adjusting sleeve 22 also rotates; and the adjustment of the eccentric amount is realized by the cooperation of the first sliding surface S2 and the second sliding surface S3.

Two key grooves are arranged on the circumference of the main shaft 26, sliding seats 24 and 27 are arranged in the key grooves, the sliding seats 24 and the sliding seats 27 are arranged on two sides of the axis of the main shaft, the upper and lower two surfaces of each of the sliding seats 24 and 27 form an included angle theta, after the sliding seats 24 and the sliding seats 27 are installed on the main shaft 26, the acting surfaces deviating from the main shaft 26 are mutually parallel and form an included angle theta with the axis of the main shaft 26 in the same direction, and two first sliding surfaces S2 are formed. The upper and lower surfaces of the follower slide block 23 and the follower slide block 28 form an included angle θ, and the included angles are respectively arranged corresponding to the action surfaces of the slide seat 24 and the slide seat 27 departing from the main shaft 26, so that the outer planes (i.e. the second sliding surface S2) of the follower slide block 23 and the follower slide block 28 departing from the main shaft 26 are parallel to the axis of the main shaft 26. Two opposite mounting grooves on the inner hole of the adjusting sleeve 22 are respectively sleeved on the outer planes of the follow-up sliding block 23 and the follow-up sliding block 28, and two sides of the key groove exceed the thin ends of the follow-up sliding block 23 and the follow-up sliding block 28 and are simultaneously clamped on two side surfaces of the sliding seat 24 and the sliding seat 27. The adjusting sleeve 22 is axially fixedly connected with the follow-up sliding blocks 23 and 28 through limiting pins 21 and 25.

The adjusting component in this embodiment includes adjusting fork 11, be equipped with the annular on the one end circumference of adjusting sleeve 22, the fork mouth portion 11A of adjusting fork 11 is located the annular, can drive adjusting sleeve 22 along main shaft axial slip.

In the present embodiment, two pairs of sliding surfaces (i.e., the first sliding surface and the second sliding surface) that are obliquely arranged in the axial direction slide relatively in the axial direction, so as to adjust the eccentricity, and the number of the sliding surfaces that are relatively matched may also be multiple pairs. The first sliding surface can be arranged by protruding the outer surface of the main shaft and can also be a concave plane, and only the first sliding surface and the second sliding surface can be matched in a sliding mode in the axial direction.

The invention also provides a feed lifting tooth driving mechanism of a sewing machine, which comprises a feed lifting tooth rack 10 and a feed lifting tooth assembly (not shown) connected with the feed lifting tooth rack 10, wherein the feed lifting tooth rack 10 is provided with a feed lifting tooth sliding block 6 sliding along the length direction of the feed lifting tooth rack 10, the feed lifting tooth sliding block 6 is arranged on a sewing machine shaft in a penetrating way, the feed lifting tooth driving mechanism also comprises an eccentric adjustable device as described above, the main shafts 9 and 26 are used as the sewing machine shaft, the adjusting sleeves 5 and 22 are arranged between the feed lifting tooth sliding block 6 and the main shafts 9 and 26, the adjusting sleeves 5 and 22 are fixedly connected with the feed lifting tooth sliding block 6 in the axial directions of the main shafts 9 and 26, and when the eccentric amounts of the adjusting sleeves 5 and 22 relative to the main shafts 9 and 26 are changed, the eccentric amounts between the central line of the feed lifting tooth sliding block 6 and the sewing shaft are changed accordingly. The invention changes the eccentricity of the lifting tooth slide block 6 by changing the eccentricity of the adjusting sleeves 5 and 22 relative to the main shafts 9 and 26, realizes the eccentricity requirement aiming at the sewing of fabrics with different thickness types, and further realizes multiple purposes of one machine.

Example one

When the eccentric assembly in the eccentric adjustable device is in the structure of the first embodiment, the adjusting sleeve 5 is arranged in the tooth lifting slide block 6, the slide block front cover 4 is arranged at the front end of the tooth lifting slide block 6, the slide block rear cover 7 is arranged at the rear end of the tooth lifting slide block 6, and the slide block front cover 4, the slide block rear cover 7 and the tooth lifting slide block 6 are respectively fixed through the screws 3 and 8, so that the adjusting sleeve 5 cannot axially move relative to the tooth lifting slide block 6. At this time, the adjusting sleeve 5 does not move axially relative to the main shaft 9, but the sleeve-shaped part 1 moves axially under the driving of the adjusting component, so that the axial position of the adjusting sleeve 5 on the outer peripheral surface of the sleeve-shaped part 1 is changed, and the eccentric amount of the tooth lifting slide block 6 is further changed.

As shown in fig. 1 and fig. 6, the adjusting assembly in this embodiment includes an adjusting block 14 (in this embodiment, the adjusting block is a lock nut) disposed outside the sewing machine housing 13 and capable of being locked with the sewing machine housing 13, and an adjusting fork 11 inserted into a sliding slot 13A of the sewing machine housing 13, wherein a shaft end 11B of the adjusting fork 11 is connected to the adjusting block 14 and slides along the sliding slot 13A under the driving of the adjusting block 14, and a fork end 11A of the adjusting fork 11 is disposed in the annular groove 101 of the sleeve 1. In the embodiment, when the eccentric amount does not need to be adjusted, the adjusting block 14 is locked, and the adjusting shifting fork 11 does not act at the moment, namely the sleeve-shaped part 1 does not act; when the eccentric amount needs to be adjusted, the locking of the adjusting block 14 is released, the adjusting shifting fork 11 is driven by the adjusting block 11 to slide along the sliding groove 13A, and then the sleeve-shaped part 1 moves axially along the main shaft 9, so that the position of the adjusting sleeve 5 on the sleeve-shaped part 1 is changed, and the eccentric amount of the adjusting sleeve 5 is changed.

In this embodiment, the adjusting block 14 is locked on the left upper cover of the sewing machine housing 13, the left upper cover is located above the feed lifting rack 10, as shown in fig. 6, a sliding groove 13A and an oil seal sliding groove 13B are arranged on the left upper cover, a shaft end 11B of the adjusting fork 11 is arranged in the sliding groove 13A of the 13A, an oil seal 12 is sleeved on the shaft end 11B of the adjusting fork 11 and is simultaneously arranged in the oil seal sliding groove 13B of the left upper cover and slides along with the adjusting fork 11, the lower end of the adjusting fork 11 is a fork opening 11A, and the fork opening 11A is forked in the annular groove 101 of the sleeve-shaped member 1, so that the sleeve-shaped member 1 slides along the axial direction of the main shaft 9 along with the adjusting fork 11, and can rotate radially relative to the adjusting fork 11.

When the locking nut is unscrewed, the adjusting shifting fork 11 can be shifted to slide back and forth along the direction of the main shaft, so that the sleeve-shaped part 1 slides back and forth in the axial direction of the main shaft 9, and accordingly, the eccentric amount of the motion centers of the corresponding different tooth lifting slide blocks 6 relative to the center of the main shaft is generated. The eccentric amount requirement for sewing of fabrics with different thickness types is met, and therefore the multifunctional sewing machine is multipurpose.

In the embodiment, the outer diameter of the adjusting sleeve 5 is constant, so that the diameter of the inner hole of the lifting tooth slide block 6 is not changed when the eccentricity of the motion center relative to the axis of the main shaft is changed, and the structure is stable and reliable.

Example two

The eccentric component in the eccentric adjustable device of this embodiment is a structure in another embodiment, the tooth lifting slider 6 is sleeved at the rear end of the adjusting sleeve 22, the front end of the adjusting sleeve 22 is provided with a ring groove, the fork opening part 11A of the adjusting fork 11 in the adjusting component is forked in the ring groove, the adjusting sleeve 22 is driven by the adjusting block 14 to axially slide along the main shaft 26, so as to drive the follower sliders 23 and 24 to axially move, and thus, the base sliders 28 and 27 are axially moved relatively, so that the position of the tooth lifting slider 6 on the adjusting sleeve 22 is changed, and the eccentric amount of the motion center of the tooth lifting slider relative to the axis of the main shaft is changed.

In summary, the eccentric adjusting device, the feed lifting driving mechanism of the sewing machine and the sewing machine of the invention have the advantages that the eccentric adjusting part is provided with the adjusting action surface which forms a certain angle with the axis of the main shaft, the central line of the inner hole of the adjusting sleeve forms a certain angle with the axis of the main shaft, the adjusting sleeve and the eccentric adjusting part slide relatively, the relative axial position of the adjusting sleeve and the adjusting sleeve is adjusted to change the eccentric amount of the adjusting sleeve relative to the main shaft, the adjustability of the eccentric amount of the adjusting sleeve relative to the main shaft is realized, the eccentric adjusting device can be used for the feed lifting driving mechanism, the requirements of fabrics with different thicknesses corresponding to different eccentric amounts are met, and even one sewing machine meets the requirements of fabrics with different thicknesses. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.