CN115161893A

CN115161893A - Tugboat device of sewing machine

Info

Publication number: CN115161893A
Application number: CN202210966767.4A
Authority: CN
Inventors: 阮宏辉
Original assignee: Karakuli Transmission Technology Taizhou Co ltd
Current assignee: Karakuli Transmission Technology Taizhou Co ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-10-11
Anticipated expiration: 2042-08-12
Also published as: CN115161893B

Abstract

The invention belongs to the field of sewing machines, and particularly relates to a tugboat device of a sewing machine. The tug boat device comprises a tug boat with rotating and lifting functions, so that the feeding and pressing actions can be completed in an auxiliary manner in the sewing process. This tug device still includes: motor, fixing base, installing support, drive mechanism and elevating system. Wherein, the motor is used as a power source for driving the tug to rotate. The fixed seat is fixedly connected with the machine body of the sewing machine; the motor is installed on the fixing base. One end of the mounting bracket is rotatably connected with the fixing seat, and the other end of the mounting bracket is connected with the tug. The mounting bracket also includes a cavity therein. The transmission mechanism is arranged in the cavity of the mounting bracket, and the motor drives the tug to rotate through the transmission mechanism. One end of the lifting mechanism is movably connected with one side of the mounting bracket close to the tug, and the other end of the lifting mechanism is fixedly connected with a presser foot of the sewing machine or a connecting rod of the presser foot. The invention solves the problems of unreasonable design, higher failure rate, lower service life and the like of the tug device of the existing sewing machine.

Description

Tugboat device of sewing machine

Technical Field

The invention belongs to the field of sewing machines, and particularly relates to a tugboat device of a sewing machine.

Background

The sewing machine is the most important mechanical equipment of garment processing enterprises, most garment processing still needs to adopt the sewing machine to carry out semi-automatic processing at present, and the performance of the sewing machine is a key factor for determining garment processing efficiency. When the common sewing machine is used, manual feeding is needed, the high-performance sewing machine can be provided with a feeding system, and the feeding system can automatically feed the fabric to be processed to a processing area where a needle is located in the processing process. However, the feeding system usually cannot ensure the smoothness of the seam material, and the uneven seam material can result in the increase of the reject ratio of the product processing process. For example, when sewing heavy products such as curtains, the products are very likely to be poor. In practical applications, in order to solve the problem of uneven sewing material, an auxiliary rear tug is usually installed in the sewing machine, and the sewing material in a processing area is compressed by the auxiliary rear tug, so that the auxiliary rear tug is required to have a lifting function in consideration of the fact that the processing process is usually not continuous and the feeding direction of the sewing material needs to be adjusted.

The scheme of back tow boat is many among the prior art, for example, drives the back tow boat through the motor and rotates to adopt electric jar drive back tow boat elevating movement etc. need adopt a plurality of external power supplies in these schemes, not only can improve the application cost of tow boat device by a wide margin, probably improve the fault rate and the maintenance degree of difficulty of this tow boat device moreover, reduce the life of device.

In order to overcome the defects of the above solutions, some technicians also develop a driving scheme of the tug using a single motor as a power source. The technical scheme has relatively high cost performance, and particularly, a set of complex transmission mechanism is designed in the scheme for driving the tug to lift and rotate by using a single motor respectively. The transmission mechanism can drive the tug to rotate in forward rotation and drive the tug to lift and release in reverse rotation. Although this solution requires only one motor to be installed, the solution is relatively low cost. However, in practical application, the transmission mechanism is complex, and a large torque required for driving the tug to lift is provided by adopting a high-power motor, so that the scheme has poor practical value and is difficult to popularize and apply.

Meanwhile, in the traditional schemes, the distance between the tugboat and the presser foot is too far due to the complicated transmission structure and the larger size of the motor, so that the defects caused by the staggered layer of sewing materials can be caused when the cloth is fed up and down, and the production efficiency and the quality are greatly influenced.

Disclosure of Invention

The problems that the conventional tug device of the sewing machine is unreasonable in design, cannot meet the requirements of light weight, simple structure, easiness in operation, installation, maintenance and the like of a product at the same time, has high failure rate and short service life in the use process and even can influence the normal function of the sewing machine are solved; the invention provides a tugboat device of a sewing machine.

The invention is realized by adopting the following technical scheme:

a tugboat device of a sewing machine comprises a tugboat with rotating and lifting functions, so that feeding and pressing actions can be completed in an auxiliary mode in the sewing process. This tug device still includes: motor, fixing base, installing support, drive mechanism and elevating system.

Wherein, the motor is used as the power source of drive tug pivoted. The fixed seat is fixedly connected with the machine body of the sewing machine; the motor is installed on the fixing base.

One end of the mounting bracket is rotatably connected with the fixing seat, and the other end of the mounting bracket is connected with the tug. The mounting bracket also includes a cavity therein. The transmission mechanism is arranged in the cavity of the mounting bracket, and one end of the transmission mechanism is fixedly connected with an output shaft of the motor; the other end is fixedly connected with a rotating shaft of the tug; the motor drives the tug to rotate through the transmission mechanism.

One end of the lifting mechanism is movably connected with one side of the mounting bracket close to the tug, and the other end of the lifting mechanism is fixedly connected with a presser foot of the sewing machine or a connecting rod of the presser foot. So that: when the presser foot is in the lifting state, the tug is in the synchronous lifting state, and when the presser foot is in the pressing state, the tug is in the synchronous pressing state and is in contact with the working table of the sewing machine.

As a further improvement of the invention, the transmission mechanism adopts any one of gear transmission, belt transmission and chain wheel-chain transmission mechanism.

Preferably, the transmission mechanism adopts a belt transmission mechanism; the transmission mechanism comprises a driving wheel, a driven wheel and a transmission belt. The driving wheel is connected with an output shaft key of the motor, and the driven wheel is coaxially connected with the tug. The transmission belt is sleeved on the driving wheel and the driven wheel, so that the driving wheel and the driven wheel rotate synchronously.

As a further improvement of the invention, the transmission mechanism also comprises a tension wheel; the tensioning wheel adopts an eccentric wheel, and the wheel surface of the tensioning wheel is attached to the outer side of the transmission belt.

As a further improvement of the invention, the mounting bracket includes a housing, a cover plate, and a bearing. The shell comprises a cavity which is long-strip-shaped; the bottom wall of one end of the shell is provided with a first through hole, and a rotating shaft of the tug penetrates through the first through hole to be in transmission connection with a driven wheel in the cavity. The other end of the cover plate, which is correspondingly far away from the first through hole, is provided with a second through hole, the outer ring of the bearing is sleeved in the second through hole, and the output shaft of the motor is sleeved in the inner ring of the bearing. The tail end of the output shaft of the motor is connected with the driving wheel key.

As a further improvement of the invention, the lifting mechanism comprises a lifting connecting rod and a movable shaft sleeve. The lifting connecting rod comprises a first connecting rod and a second connecting rod. The first connecting rod and the second connecting rod are rotatably connected through a pin shaft, and then a V-shaped structure is formed. The other end of the first connecting rod is fixedly connected with the presser foot or a connecting rod of the presser foot; the other end of the second connecting rod comprises a straight rod section with a smooth surface. The movable shaft sleeve is rotatably connected to the mounting bracket and is positioned at one side close to the tug. The side surface of the movable shaft sleeve is provided with a shaft sleeve hole which penetrates through the movable shaft sleeve; the straight rod section of the second connecting rod is inserted into the shaft sleeve hole; the tail end of the second connecting rod is also provided with a limiting piece for preventing separation.

As a further improvement of the invention, an elastic piece is arranged between the second connecting rod and the rotating shaft sleeve, and the elastic piece is in a deformation state when the tug is pressed down, so that a pressing force capable of being adjusted in a self-adaptive manner is generated; the down force acts on the underside of the tug.

Preferably, the elastic member is a spring; the spring is sleeved on the straight rod section of the second connecting rod. An external thread is arranged at one end of the straight rod section, which is close to the second connecting rod, a rotary adjusting nut is further arranged at the external thread of the straight rod section, and the spring is abutted between the rotary adjusting nut and the movable shaft sleeve.

As a further improvement of the invention, the motor is a stepping motor, a servo motor, a synchronous motor, a direct current motor or a direct current motor with a speed reducer.

As a further improvement of the invention, a PU sheath layer is sleeved on the outer wheel surface of the tug, and a low-resistance film for reducing the friction force between the tug and the sewing material is arranged at the falling point when the tug is pressed down.

The technical scheme provided by the invention has the following beneficial effects:

the invention designs a novel tug device, which only adopts a motor, wherein the motor is used for driving the tug to rotate so as to realize real-time feeding, a mounting bracket of the tug can rotate relative to the motor so as to realize the lifting of the tug, the embodiment also designs a lifting mechanism special for driving the tug to lift by utilizing a presser foot, and further, the lifting mechanism is driven by a spindle motor for driving the presser foot to synchronously lift the tug.

This scheme is built-in drive mechanism in the mounting bracket, and then can reduce the drive mechanism and take place the fault rate of jam and wearing and tearing, improves the operating stability and the life of this tow boat device. Meanwhile, the tugboat device also has good overrun bearing capacity, and can perform self-adaptive adjustment on the pressure and the height of the tugboat according to the thickness of the sewing material; has more effective stem passing capability.

In the technical scheme provided by the invention, the tug device can independently or synchronously control the lifting and rotating actions according to the requirements, so that the tug device can be used in richer application scenes and has stronger functions.

The tug boat device has fewer parts and is suitable for miniaturization and light weight. Meanwhile, the product is simpler in structure, higher in stability and lower in failure rate. The scheme has lower performance requirements on high-value parts such as motors and the like, so that the comprehensive cost of the product can be greatly reduced.

This scheme not only can install in the sewing machine of new design and use, also can be applicable to and reform transform the promotion to old money sewing machine, has higher practical value.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of an assembled tugboat device and sewing machine of a sewing machine according to embodiment 1 of the present invention.

Fig. 2 is a structural schematic diagram of a bottom view of the tug boat device after installation.

Fig. 3 is a schematic structural diagram of a combined body after the mounting bracket, the transmission mechanism and the fixing seat are assembled.

Fig. 4 is a schematic structural view of a lifting mechanism used in the tug boat apparatus.

Fig. 5 is a schematic structural view of the transmission mechanism after being assembled with the bearing and the fixing seat.

Labeled as: 1. a tug; 2. a motor, 3, a fixed seat; 4. mounting a bracket; 5. a transmission mechanism; 6. a lifting mechanism; 7. a presser foot; 41. a second through hole; 40. a bearing; 51. a driving wheel; 52. a driven wheel; 53. a belt; 54. a tension pulley; 60. a pin shaft; 61. a first link; 62. a second link; 63. a movable shaft sleeve; 620. a straight pole section; 621. a spring; 622. a stopper; 623. and (6) screwing and adjusting the nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

The embodiment provides a tug device of a sewing machine, which comprises a tug 1 with rotating and lifting functions, wherein the tug 1 is used for assisting in completing feeding and pressing in a sewing process. As shown in fig. 1, the tug boat device further comprises: motor 2, fixing base 3, installing support 4, drive mechanism 5 and elevating system 6.

Wherein, the motor 2 is used as a power source for driving the tug 1 to rotate. The fixed seat 3 is fixedly connected with the body of the sewing machine; the motor 2 is installed on the fixing base 3.

One end of the mounting bracket 4 is rotatably connected with the fixed seat 3; specifically, the mounting bracket 4 can rotate relative to the fixing base 3 by using the output shaft of the motor 2 on the fixing base 3 as a center. The other end of the mounting bracket 4 is connected with the tug 1. The mounting bracket 4 also contains a cavity therein. The transmission mechanism 5 is arranged in the cavity of the mounting bracket 4, and one end of the transmission mechanism 5 is fixedly connected with the output shaft of the motor 2; the other end is fixedly connected with a rotating shaft of the tug 1; the motor 2 drives the tug 1 to rotate through a transmission mechanism 5.

One end of the lifting mechanism 6 is movably connected with one side of the mounting bracket 4 close to the tug 1, and the other end is fixedly connected with a presser foot 7 of the sewing machine or a connecting rod of the presser foot 7. So that: when the presser foot 7 is in a lifting state, the tug 1 is in a synchronous lifting state, and when the presser foot 7 is in a pressing state, the tug 1 is in a synchronous pressing state and is in contact with the working table of the sewing machine.

In the tug device provided by the embodiment, the motor 2 drives the tug 1 to rotate through the transmission structure, and meanwhile, the pressure foot 7 of the sewing machine can distribute the driving force on the pressure foot 7 connecting rod to one end, connected with the roller, of the mounting bracket 4 through the lifting mechanism 6 when lifting, so that the tug 1 can lift along with the pressure foot 7 of the sewing machine.

The working principle of the tug 1 in the device is analyzed to know that: the power source of the tug 1 during rotary feeding is the motor 2, and the rotating speed of the tug 1 is comprehensively controlled by the rotating speed of the output shaft of the motor 2 and the transmission ratio of the transmission mechanism 5. The power source of the lifting action of the tug 1 and the power source of the presser foot 7 are the same (namely, the main shaft of the sewing machine). Therefore, the tug boat device provided by the embodiment only adopts one external power source, namely the motor 2. Meanwhile, the motor 2 only needs to drive the tug 1 to rotate, and the requirement on the torque of the motor 2 is relatively low, so that the motor 2 can adopt products with relatively small size, such as various stepping motors, servo motors and synchronous motors. Meanwhile, the direct current motor also becomes an alternative scheme, but the direct current motor can be matched with a speed reducer for use due to high rotating speed. Such a design increases the selectable range of the motor 2 and reduces the procurement cost of the motor 2. Therefore, the tug 1 mechanism provided by the embodiment has a smaller overall structure, can be further installed in various existing sewing machines, and has smaller influence on the normal functions of the sewing machines. During application, the drive of the motor 2 is controlled by the electric control system of the sewing machine.

In addition, as the transmission mechanism 5 and the lifting mechanism 6 of the tug device provided by the embodiment are completely independent, the lifting motion and the rotating motion of the tug 1 are independently controlled by two sets of components; therefore, the tug device can be used for independently adjusting the rotating speed or the lifting height and can also be used for simultaneously adjusting the height and the rotating speed of the tug 1. The practicability is greatly improved, and the popularization and application values are higher.

Specifically, as can be seen from fig. 2 and 3, in the tug boat device provided in the present embodiment, the transmission mechanism 5 is a belt 53 transmission mechanism 5; the transmission mechanism 5 includes a driving pulley 51, a driven pulley 52, and a transmission belt 53. The driving wheel 51 is in key connection with an output shaft of the motor 2, and the driven wheel 52 is in coaxial connection with the tug 1. The driving pulley 51 and the driven pulley 52 are sleeved with the transmission belt 53, so that the driving pulley 51 and the driven pulley 52 synchronously rotate.

The mounting bracket 4 in this embodiment comprises a housing, a cover plate and a bearing 40. The shell comprises a cavity which is long-strip-shaped; the bottom wall of one end of the shell is provided with a first through hole, and a rotating shaft of the tug 1 penetrates through the first through hole to be in transmission connection with a driven wheel 52 in the cavity. The other end of the cover plate, which is correspondingly far away from the first through hole, is provided with a second through hole 41, the outer ring of the bearing 40 is sleeved in the second through hole 41, and the output shaft of the motor 2 is sleeved in the inner ring of the bearing 40. The tail end of the output shaft of the motor 2 is connected with the driving wheel 51 in a key mode.

In this embodiment, the motor 2 and the fixing base 3 can be mounted together by a connecting member such as a bolt, thereby forming a stable assembly. The outer ring of the bearing 40 is connected with the mounting bracket 4 and the inner ring is connected with the output shaft of the motor 2. Therefore, the bearing 40 not only realizes that the mounting bracket 4 (and the transmission mechanism 5 therein) is stably suspended on the fixed seat 3, but also enables the mounting bracket 4 to rotate relative to the fixed seat 3, thereby being convenient for lifting adjustment of the tug 1.

In the technical scheme provided by this embodiment, the mounting bracket 4 is a closed housing, so that the internal transmission mechanism 5 can be protected in the using process, and the phenomenon that dust or sundries are blocked in the transmission mechanism 5 to block or damage the dragging wheel device is avoided.

Specifically, as shown in fig. 4, the lifting mechanism 6 in the present embodiment includes a lifting link and a movable bushing 63. The lifting link includes a first link 61 and a second link 62. The first link 61 and the second link are rotatably connected by a pin 60 to form a V-shaped structure. The other end of the first connecting rod 61 is fixedly connected with the presser foot 7 or the connecting rod of the presser foot 7; the other end of the second link 62 includes a smooth surfaced straight segment 620. The movable sleeve 63 is rotatably connected to the mounting bracket 4 and is located on a side adjacent to the tug 1. The side surface of the movable shaft sleeve 63 is provided with a shaft sleeve hole which penetrates through the movable shaft sleeve; the straight rod section 620 of the second connecting rod 62 is inserted into the shaft sleeve hole; the end of the second link 62 is also provided with a stopper 622 for preventing disengagement.

The structure in fig. 4 is subjected to a stress analysis, so that: when the presser foot 7 is lifted, the first connecting rod 61 is driven to move up and down, and the second connecting rod 62 is controlled to move. In the lifting process of the second connecting rod 62, an upward or downward acting force is provided for the movable shaft sleeve 63 and the mounting bracket 4, so that the mounting bracket 4 is driven to rotate along the bearing 40, and the purpose of driving the tug 1 to lift is achieved. Because the presser foot 7 at the tail end of the first connecting rod 61 is vertically lifted in the movement process, and the mounting bracket 4 at the tail end of the second connecting rod 62 only can rotate along the bearing 40, namely the movement locus of the lifting process is an arc, the movement loci are not matched actually, and the required power transmission effect cannot be realized by adopting a common connecting rod assembly.

The lifting mechanism 6 of the present embodiment employs a special V-shaped dual link assembly so that the first link 61 and the second link 62 can be rotated with respect to each other. Meanwhile, the second connecting rod 62 is sleeved with the movable shaft sleeve 63 on the mounting bracket 4, so that the two are slidably connected. Therefore, the lifting mechanism 6 has multiple degrees of freedom, so that the vertical lifting of the presser foot 7 is matched with the rotary lifting process of the tug 1, smooth transmission is realized, and the assembly is prevented from being locked in the moving process.

It is to be emphasized that: although the power source of the tug 1 in the lifting process in the embodiment is provided by the lifting driving mechanism of the presser foot 7 (namely the sewing machine main shaft motor 2), the motor 2, the mounting bracket 4, the transmission mechanism 5 and the tug 1 (comprising the movable shaft sleeve 63 in the lifting mechanism 6) are all connected on the fixed seat 3, and the fixed seat 3 is fixedly connected with the machine head or the machine table of the sewing machine. Therefore, the gravity load of the whole tug device is actually mainly borne by the machine table, so that the lifting process of the tug 1 only needs the spindle motor 2 of the sewing machine to distribute small power to the lifting mechanism 6, and the installed tug device can not influence components such as a needle or a presser foot 7 of the sewing machine. This ensures the entire equipment life of the sewing machine.

The transmission mechanism 5 in the tug boat device of the embodiment employs the belt 53 transmission mechanism 5. In practical applications, the driving pulley 51 and the driven pulley 52 can be either a belt 53 pulley with teeth or a belt 53 pulley with smooth surface. When using different types of belt 53 pulleys, an adapted belt 53 needs to be selected. In other embodiments, the transmission mechanism 5 may also adopt any one of a gear transmission, a belt 53 transmission, and a sprocket-chain transmission mechanism 5. Even a rod drive with bevel gears at the ends, etc. may be used.

Among the above various transmission mechanisms 5, belt 53 transmission is the most preferable solution for the following reasons: 1. the parts are easy to assemble, low in cost and good in stability. 2. The transmission mechanism 5 is more easily miniaturized and lightened. 3. The belt 53 can be used for counteracting the resistance born by the motor 2 when the tug 1 is stressed and overloaded when necessary, and the phenomenon that the motor 2 is forcibly stopped under the action of external force to cause the motor 2 to be burnt in the use process is avoided.

Since the present embodiment uses the belt 53 and the pulley of the belt 53 as the transmission mechanism 5, as shown in fig. 5, in order to prevent the belt 53 from aging and deforming to affect the transmission effect, a tension pulley 54 is further provided in the transmission mechanism 5. The idler pulley 54 is an eccentric wheel, and the surface of the idler pulley 54 is attached to the outer side of the transmission belt 53. The tensioner 54 acts to "grip" the belt 53 and pulley 53 by changing the tension of the belt 53, thereby eliminating unnecessary slip and improving the transmission efficiency of the transmission 5.

Particularly, in a more optimized scheme of the embodiment, an elastic member is further arranged between the second connecting rod 62 and the rotating shaft sleeve, and the elastic member is in a deformation state when the tug 1 is pressed down, so that a pressing force capable of being adjusted in a self-adaptive manner is generated; a downward force is applied below the tug 1.

In this embodiment, the function of the elastic member installed between the second link 62 and the rotating shaft sleeve mainly includes two points: firstly, the downforce of the tugboat 1 in the downforce process is increased, so that the tugboat 1 is kept in close contact with the sewing material. The friction between the tugboat 1 and a smoother sewing material (such as silk, polyester fiber, viscose fiber, terylene, spandex, chinlon, modal and the like) is prevented from being small when the tugboat 1 is pressed down, so that the tugboat 1 cannot effectively drive the sewing material to move in the rotating process, and the feeding effect of the tugboat 1 is ensured. Secondly, when the sewing material is folded, extruded and deformed or thick sewing material is replaced, the local pressure borne by the tugboat 1 is obviously increased, and at the moment, the movable shaft sleeve 63 and the mounting bracket 4 can be properly lifted, so that the gap between the tugboat 1 and the object below is enlarged; and then avoid the tug 1 and sewing material to take place the jam between them, after above emergency eliminated, the elastic component reset, and tug 1 again keeps the best downforce. The elastic piece can adopt various components such as a spring 621, a reed, an elastic rubber strip, an elastic sealing ring and the like, and different installation modes and installation positions are selected according to different stress and deformation modes of different elastic pieces.

Specifically, as shown in fig. 2 and 4, the elastic member in the present embodiment employs a spring 621; the spring 621 is sleeved on the straight rod section 620 of the second connecting rod 62. In particular, in this embodiment, an external thread is disposed at one end of the straight rod section 620 close to the second connecting rod 62, a turning nut 623 is further disposed at the external thread of the straight rod section 620, and the spring 621 abuts between the turning nut 623 and the movable bushing 63.

The effect of the rotation adjusting nut 623 is to adjust the initial deformation degree of the spring 621 according to the actual installation and application state, so that the lifting connecting rod and the movable shaft sleeve 63 can be kept in the optimal state in the using process. For example, when the tug 1 is pressed down, an excessive pressure on the tug 1 will cause the spring 621 to be looser by turning the nut 623, and when the lower pressure is insufficient, the spring 621 will be tighter by turning the nut 623.

In the lifting mechanism 6 of the present embodiment, the limiting member 622 at the end of the second connecting rod 62 mainly prevents the connecting rod from being disengaged from the bushing hole during sliding, so the limiting member 622 can take various forms during application. For example: the limiting member 622 may be a limiting nut, and an external thread is disposed at the end of the second connecting rod 62, and the limiting nut is sleeved on the external thread at the end of the second connecting rod 62. The limiting member 622 may also be a cotter pin or a conventional pin 60, and a pin hole is formed at the end of the second connecting rod 62, and the cotter pin or the conventional pin 60 is inserted into the pin hole. Or the end of the second link 62 is directly pressed, deformed or bent so that the size of the end is larger than the axle sleeve hole in the movable axle sleeve 63, and the deformed portion constitutes the desired limiting member 622.

In this embodiment, the cover is equipped with the restrictive coating of PU material on the outer round face of tow boat 1, and the restrictive coating uses is a wear-resisting flexible material, consequently can increase the frictional force between tow boat 1 and seam material in the use to can not cause the damage to seam material. And a low-resistance film for reducing the friction force between the tow wheel 1 and the sewing material is arranged at the falling point when the tow wheel is pressed down. The ground resistance film can be made of smooth materials such as ceramics or glass. The barrier film can be reduced to make the seam material slide on the surface of the machine table more smoothly.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A tugboat device of a sewing machine comprises a tugboat and is characterized in that the tugboat has the functions of rotation and lifting, so that the auxiliary feeding and pressing in the sewing process are realized; the tug boat device further comprises:

a motor as a power source for driving the tug to rotate;

the fixed seat is fixedly connected with the machine body of the sewing machine; the motor is arranged on the fixed seat;

a mounting bracket including a cavity therein; one end of the mounting bracket is rotatably connected with the fixed seat, and the other end of the mounting bracket is connected with the tug;

the transmission mechanism is arranged in the cavity of the mounting bracket, and one end of the transmission mechanism is fixedly connected with an output shaft of the motor; the other end is fixedly connected with a rotating shaft of the tug; the motor drives the tug to rotate through the transmission mechanism; and

one end of the lifting mechanism is movably connected with one side of the mounting bracket close to the tug, and the other end of the lifting mechanism is fixedly connected with a presser foot of the sewing machine or a connecting rod of the presser foot; so that: when the presser foot is in a lifting state, the tug is in a synchronous lifting state, and when the presser foot is in a pressing state, the tug is in a synchronous pressing state and is in contact with a working table of the sewing machine.

2. The tug apparatus of claim 1, wherein: the transmission mechanism adopts any one of gear transmission, belt transmission and chain wheel-chain transmission mechanism.

3. The tug apparatus of claim 2, wherein: the transmission mechanism adopts a belt transmission mechanism; the transmission mechanism comprises a driving wheel, a driven wheel and a transmission belt; the driving wheel is in key connection with an output shaft of the motor, and the driven wheel is coaxially connected with the tug; the transmission belt is sleeved on the driving wheel and the driven wheel, so that the driving wheel and the driven wheel rotate synchronously.

4. The tug apparatus of claim 3, wherein: the transmission mechanism also comprises a tension wheel; the tensioning wheel adopts an eccentric wheel, and the wheel surface of the tensioning wheel is attached to the outer side of the transmission belt.

5. The tug apparatus of claim 3, wherein: the mounting bracket comprises a shell, a cover plate and a bearing; the shell comprises the cavity, and the cavity is long-strip-shaped; a first through hole is formed in the bottom wall of one end of the shell, and a rotating shaft of the tug passes through the first through hole and is in transmission connection with a driven wheel in the cavity; the other end of the cover plate, which is far away from the first through hole, is provided with a second through hole, the outer ring of the bearing is sleeved in the second through hole, the output shaft of the motor is sleeved in the inner ring of the bearing, and the tail end of the output shaft of the motor is in key connection with the driving wheel.

6. The tug apparatus of claim 1, wherein: the lifting mechanism comprises a lifting connecting rod and a movable shaft sleeve; the lifting connecting rod comprises a first connecting rod and a second connecting rod; the first connecting rod and the second connecting rod are rotatably connected through a pin shaft to form a V-shaped structure; the other end of the first connecting rod is fixedly connected with the presser foot or a connecting rod of the presser foot; the other end of the second connecting rod comprises a straight rod section with a smooth surface; the movable shaft sleeve is rotatably connected to the mounting bracket and is positioned at one side close to the tug; a shaft sleeve hole penetrating through the side surface of the movable shaft sleeve is formed; the straight rod section of the second connecting rod is inserted into the shaft sleeve hole; the tail end of the second connecting rod is also provided with a limiting piece for preventing separation.

7. The tug apparatus of claim 6, wherein: an elastic piece is arranged between the second connecting rod and the rotating shaft sleeve, and the elastic piece is in a deformation state when the tug is pressed down, so that a pressing force capable of being adjusted in a self-adaptive mode is generated; the downforce acts below the tug.

8. The tug apparatus of claim 7, wherein: the elastic piece adopts a spring; the spring is sleeved on the straight rod section of the second connecting rod; an external thread is arranged at one end, close to the second connecting rod, of the straight rod section, a rotary adjusting nut is further arranged at the external thread of the straight rod section, and the spring is abutted between the rotary adjusting nut and the movable shaft sleeve.

9. The tug apparatus of claim 1, wherein: the motor adopts a stepping motor, a servo motor, a synchronous motor, a direct current motor or a direct current motor with a speed reducer.

10. The tug apparatus of claim 1, wherein: the outer wheel surface of the tug is sleeved with a PU sheath layer; and a low-resistance film for reducing the friction force between the tugboat and the sewing material is arranged at a falling point when the tugboat is pressed down.