CN116024749A - Sewing machine and tensioning device thereof - Google Patents

Abstract

The application relates to the technical field of sewing equipment, in particular to a tensioning device, which comprises a tensioning wheel and a base, wherein the tensioning wheel is arranged on the base, and the base is arranged beside a belt of a sewing machine and enables the tensioning wheel to be propped against the belt; the two ends of the belt are respectively connected with the thread winding mechanism and the main driving shaft of the sewing machine so as to drive the sewing needle and the thread winding mechanism of the sewing machine to synchronously move. The tensioning device of the belt tensioning device is characterized in that the tensioning wheel is connected with the sewing machine through the base, and then the belt is tensioned by the tensioning wheel in a propping mode. Thereby overcoming the problem that the belt is likely to fall off due to the loosening. The application also discloses a sewing machine provided with the tensioning device, and the transmission rod part in the conventional sewing machine is replaced by a belt. And the belt is supported by means of the matching of the tensioning device, so that the risk that the belt falls off due to deformation after long-term use is overcome.

Description

Sewing machine and tensioning device thereof

Technical Field

The application relates to the technical field of sewing equipment, in particular to a sewing machine and a tensioning device thereof.

Background

With the continuous progress and development of society, the mechanical equipment in the existing production line is increasingly prone to light weight and automation. The sewing machine is a mechanical device involved in the production of typical fabrics, leatherware and the like. The machine is used for interweaving or sewing one or more layers of sewing materials by forming one or more stitches on the sewing materials by one or more sewing threads.

In the existing sewing machine, the sewing needle of the machine head and the reel work simultaneously in a mutually matched mode, and production of sewing clothes and cloth is achieved. When the sewing needle reciprocates along the length direction (generally up and down), a rod-shaped transmission component is usually adopted to cooperatively connect a main driving shaft of the sewing machine and an input shaft of a winding mechanism, and simultaneously, a winding wheel is driven to rotate, so that the sewing work is realized. The drive assembly requires a housing to provide a motion stop for the rod-like member. However, the housing tends to increase the weight of the sewing machine.

However, if a belt is used instead of a rod-like member, the belt life problem is adversely caused, although the weight problem can be solved. Since the belt structure tends to be flexible, there is little problem when driving assistance. However, when the drive is performed between the main shaft and the reel of the sewing machine, the work load is large, and the life limit is reached quickly, and the slack occurs. Therefore, in various sewing machines of the prior art, there is almost no application of using a belt instead of a rod-like member as a transmission assembly between a main drive shaft of the sewing machine and an input shaft of a winding mechanism.

Disclosure of Invention

To solve or at least partially solve the above technical problem, the present application provides a sewing machine and a tensioning device thereof, wherein the tensioning device comprises:

the belt conveyer comprises a tension wheel and a base, wherein the tension wheel is arranged on the base, and the base is arranged beside a belt of a sewing machine and enables the tension wheel to be propped against the belt;

the two ends of the belt are respectively connected with the thread winding mechanism and the main driving shaft of the sewing machine so as to drive the sewing needle and the thread winding mechanism of the sewing machine to synchronously move.

The base is used for connecting the tension wheel with the sewing machine, and then the tension wheel is used for propping against the belt, so that the belt is tensioned. Thereby overcoming the problem that the belt is likely to fall off due to the loosening.

Optionally, the base includes: the rotating shaft is fixed on the sewing machine, and the tensioning wheel is sleeved on the rotating shaft and can rotate freely on the rotating shaft.

Optionally, the base further comprises: a slide block and a slide rail;

the rotating shaft is arranged on the sliding block, and the sliding block is arranged on the sliding rail so that the tensioning wheel can be close to or far away from the belt.

The position of the sliding block on the sliding rail is changed, and the sliding block is connected with the tensioning wheel through the rotating shaft, so that the position of the tensioning wheel is adjusted to support the belt.

Preferably, the base further comprises: and one end of the spring is relatively fixed, and the other end of the spring is connected with the sliding block.

The spring gradually grows along with the deformation of the belt, so that the tension wheel is always in a state of propping against and tensioning the belt.

Preferably, the base further comprises: and the fastening piece is used for fastening the sliding block.

Optionally, the base further comprises: the telescopic component can drive the sliding block to move along the sliding rail under the driving of the telescopic power source.

Preferably, the base further comprises: the pressure sensor is used for detecting the pressure born by the rotating shaft, and is in communication connection with the telescopic power source.

The pressure sensor can accurately acquire the pressure between the belt and the tension roller, and the position of the tension roller is conveniently adjusted through the telescopic component.

The present application also provides a sewing machine comprising:

the main body is provided with a machine head, and a sewing needle is arranged on the machine head;

the winding mechanism is arranged opposite to the machine head;

the driving motor and the main driving shaft are arranged on the driving motor, and the main driving shaft is connected into the machine head and drives the sewing needle to reciprocate;

the two ends of the belt are respectively connected with a winding mechanism and a main driving shaft of the sewing machine so as to drive a sewing needle and the winding mechanism of the sewing machine to synchronously move;

a tensioning device as defined in any one of the claims mounted to the body and exerting a force on the strap to tension the strap.

Preferably, the main body further comprises:

a side panel mounted on a side of the body remote from the handpiece, the winding mechanism having an input shaft;

the side panel is provided with a first through hole and a second through hole, the first through hole is used for the main driving shaft to pass through, and the second through hole is used for the input shaft to pass through;

the main driving shaft and the input shaft are provided with belt pulleys which are positioned on the same side of the side panel, and the belt is connected with the belt pulleys; the base is disposed on the side panel.

Preferably, the belt and the tensioner are both positioned on one side of the side panel away from the handpiece;

and the base is detachably connected with the side panel.

The base is detachably connected with the side panel, so that the tensioning device is convenient to detach in the later period.

The sewing machine in this application achieves replacement of the drive rod components in conventional sewing machines by means of a belt. In contrast, the belt is lighter in weight and higher in safety, and even if exposed to the outside, a protective shell is not required.

Meanwhile, the tension device is arranged on the sewing machine, and the tension wheel in the tension device can prop against the belt, so that the problem that the belt is likely to fall off due to deformation and relaxation is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application, a brief description of the associated drawings will be provided below. It is understood that the drawings in the following description are only for illustrating some embodiments of the present application, and that one of ordinary skill in the art can obtain many other technical features and connection relationships not mentioned herein from the drawings.

Fig. 1 is a schematic perspective view of a sewing machine according to the present application.

Fig. 2 is a side view of a sewing machine provided herein.

Fig. 3 is a schematic structural diagram of a first transmission assembly provided in the present application.

Fig. 4 is a schematic structural diagram of a second transmission assembly provided in the present application.

Fig. 5 is a schematic view of a side panel provided herein.

Fig. 6 is a schematic structural view of another side panel provided herein.

Fig. 7 is a schematic structural view of yet another side panel provided herein.

Fig. 8 is a schematic structural view of the connection between the sewing machine and the mechanical arm.

FIG. 9 is a force-bearing schematic diagram of the connection between the sewing machine and the mechanical arm.

Fig. 10 is a schematic structural view of a first tensioning device provided in the present application.

Fig. 11 is a schematic structural view of a second tensioning device provided in the present application.

Fig. 12 is a schematic structural view of a base in the tensioning device provided in the present application.

Fig. 13 is a perspective view of a connection between a tensioner and a rotating shaft in the tensioner provided in the present application.

Fig. 14 is a schematic structural view of a third tensioning device provided in the present application.

Fig. 15 is a schematic structural view of a fourth tensioning device provided in the present application.

Fig. 16 is a schematic view of a partial enlarged structure of a third tensioning device provided in the present application.

Reference numerals illustrate:

1. a main body; 11. a machine head; 111. a sewing needle; 12. a sewing mechanism; 121. an input shaft; 122. a wire spool; 123. a second transmission assembly; 13. a side panel; 131. a first flat plate portion; 1311. a first through hole; 132. a connection part; 1321. a hole; 133. a second flat plate portion; 1331. a second through hole; 134. reinforcing ribs;

2. a drive assembly; 21. a driving motor; 22. a support mechanism; 23. a first transmission assembly; 231. a first rotating lever; 232. a first rotating gear; 233. a gear plate;

3. a connecting piece; 31. a connecting seat; 311. a first fixing hole; 32. a peripheral plate; 33. a cover plate; 331. a second fixing hole;

4. a tread assembly; 41; a first rotating wheel; 42. a belt; 43. a second rotating wheel;

5. a mechanical arm;

61. a junction; 62. a first end of the sewing machine; 63. a second end of the sewing machine;

71. a tensioning wheel; 711. rotating the cavity;

72. a base; 721. a rotating shaft; 7211. rotating the groove; 722. a slide block; 723. a slide rail; 724. a spring; 725. a tightening piece; 726. a telescopic member; 727. a pressure sensor.

Detailed Description

The present application will be described in detail with reference to the accompanying drawings.

Embodiment one

The inventors of the present application have found that in the existing sewing machine, the sewing mechanism and the thread winding portion are driven simultaneously by a transmission rod assembly. The existing transmission rod assembly belongs to a rod-shaped structure, and a shell is required to be arranged outside the transmission rod assembly to provide movement limit for the rod-shaped component. In addition, the shell can also prevent the rod-shaped component from damaging an operator. However, the housing tends to increase the weight of the sewing machine. In daily production, handling of the sewing machine is inevitably involved, which brings inconvenience to actual production operation.

Therefore, the applicant has desired to solve the weight problem of the sewing machine of the prior art by using a belt instead of the rod-shaped member, and to miniaturize and lighten the sewing machine. The inventors have found that the problem is not great when driving assistance, as the belt structure tends to be flexible. However, when the drive is performed between the main shaft and the reel of the sewing machine, the work load is large, and the life limit is reached quickly, and the slack occurs. This problem is the main reason why the drive of sewing machines is still commonly carried out with rod-shaped elements in the prior art.

In view of this, embodiments of the present application provide a sewing machine, as shown in fig. 1, 2 and 3, including:

a main body 1, the main body 1 having a head 11 on which a sewing needle 111 is provided;

the winding mechanism 12, the winding mechanism 12 is connected to the main body 1, and is arranged opposite to the head of the machine 11;

the driving component 2, the driving component 2 is connected with the main body 1, and drives the sewing needle 111 on the machine head 11 to reciprocate along the length direction of the sewing needle, and the reciprocating motion is that the sewing needle moves back and forth along the up and down direction of the picture in fig. 1;

a pulley assembly 4, wherein the pulley assembly 4 comprises a belt 42, and the belt 42 is respectively connected with the winding mechanism 12 and the driving assembly 2 so that the winding mechanism 12 is matched with the reciprocating motion of the sewing needle 111 to wind;

the sewing machine further comprises a tensioning device which is mounted on the main body 1 and applies a force to the belt 42 to tension the belt 42. Referring specifically to fig. 10, the tensioning device comprises: tensioner 71 and base 72.

The tensioning wheel 71 can be arranged on the base 72, the base 72 can be detachably arranged beside the belt 42 of the sewing machine, and the tensioning wheel 71 is abutted against the belt 42; the belt 42 has both ends connected to the thread winding mechanism 12 and the main driving shaft of the sewing machine, respectively, to drive the sewing needle 111 and the thread winding mechanism 12 of the sewing machine to move synchronously.

In particular use, the driving assembly 2 is activated, and the driving assembly 2 can drive the sewing needle 111 to move in the length direction thereof. Meanwhile, the driving unit 2 winds the thread by driving the thread winding mechanism 12 in cooperation with the reciprocating motion of the sewing needle 111 through the belt 42. The present application replaces the drive rod assembly in a conventional sewing machine with a belt 42. Compared to the drive rod assembly, the belt 42 works without the need for a housing stop, and the omitted housing can significantly reduce the weight of the sewing machine. At the same time, the weight of the belt 42 is lighter and safer than a drive rod.

As the sewing machine continues to be used, the belt 42 may be deformed gradually and the length may be increased gradually, so that it may not be tightly attached to the winding mechanism 12 and the driving assembly 2, and there is a risk of falling off. In the embodiment of the application, the tensioning wheel 71 is connected with the sewing machine through the base 72, and the tensioning wheel 71 is propped against the belt 42, so that the problem that the belt 42 is loosened to cause possible falling is solved.

The base 72 may be removably mounted to the sewing machine adjacent the belt 42, including, but not limited to, the following: the base 72 is attached to the sewing machine by means of bolts, screws, pins or the like.

The embodiment of the present application will be described by taking a threaded connection as an example: the sewing machine and the base 72 are provided with a plurality of threaded holes, and then the threaded holes are accessed by rotating bolts, so that the base 72 is fixed on the sewing machine.

In the embodiment of the application, the base 72 and the sewing machine can be detached, so that the base 72 can be detached from the sewing machine conveniently, and the tensioning device can be replaced integrally. Meanwhile, a plurality of holes are required to be formed in the detachable arrangement, so that the weight of the sewing machine can be reduced.

Further, in fig. 10, the base 72 may include a rotation shaft 721 in the embodiment of the present application, the rotation shaft 721 may be connected to the sewing machine by a bolt or a screw or a pin, and the tensioner 71 may be sleeved on the rotation shaft 721 and may freely rotate on the rotation shaft 721.

In order to facilitate understanding that the tensioner 71 can freely rotate on the rotary shaft 721, the following description will be given in detail:

referring to fig. 13, a rotating cavity 711 may be formed at a position near the center inside the tensioner 71, and a rotating groove 7211 may be formed at an end of the rotating shaft 721 away from the sewing machine toward the axial direction. And the outer diameter of the rotating groove 7211 is approximately equal to the inner diameter of the rotating cavity 711.

When the tensioner 71 is mounted, the tensioner 71 may be fitted around the rotary shaft 721 and the outer diameter rotary cavity 711 of the rotary groove 7211 may be fitted. This ensures that the tensioner can be mounted on the rotary shaft 721 and can freely rotate relative to the rotary shaft 721.

Alternatively, the tensioner 71 is mounted on the rotary shaft 721 by means of a bearing. Namely, the outer ring body of the bearing is connected with the tensioner 71, the inner ring body of the bearing is connected with the rotating shaft 721, and the outer ring body and the inner ring body are connected through balls, so that the rotating grooves 7211 and the rotating cavities 711 are connected through the balls in a rotating way, and the friction force between the rotating grooves 7211 and the rotating cavities 711 can be effectively reduced.

It should be noted that the description of the tensioner 71 being able to rotate freely on the rotation shaft 721 is only exemplary 2.

It should be noted that, in the present embodiment, the tensioner 71 can freely rotate relative to the rotating shaft 721, and the rotating shaft 721 cannot freely rotate relative to the sewing machine. Simultaneously, the rotating shaft 721 is detachably connected with the sewing machine, so that the tensioning device is convenient to detach, and the practicability is high.

In order to facilitate understanding of the connection relationship between the main body 1 and the winding mechanism 12 in the sewing machine, referring to fig. 1 and 6, in the embodiment of the present application, the sewing machine may further include: side panels 13.

The side panel 13 may be mounted on the side of the main body 1 remote from the head 11 by bolting. The driving assembly 2 may be welded, riveted or bolted to the side panel 13, and a first through hole 1311 may be formed in the side panel 13 so that the driving assembly 2 reciprocates through the driving sewing needle 111. The side panel can also be provided with a second through hole 1331, so that the winding mechanism 12 can be matched conveniently to work.

While the winding mechanism 12 is mounted on the side panel 13 by welding or bolts and corresponds to the position of the main body 1, the belt 42 is mounted on the side panel 13 and connects the spindle of the drive assembly 2, the winding mechanism 12.

The base 72 is detachably arranged on the side panel 13, and the belt 42 and the tensioner 71 are both positioned on the side of the side panel 13 away from the machine head.

Further, referring to fig. 1, 3, and 6, in the embodiment of the present application, the driving assembly 2 may include: a drive motor 21, a support mechanism 22 and a first transmission assembly 23.

The driving motor 21 may be mounted on the supporting mechanism 22 by bolts or screws, and one end of the supporting mechanism 22 remote from the driving motor 21 is welded or fixedly mounted on the main body 1 by bolts. The main shaft of the driving motor 21 passes through the first through hole 1311, and the sewing needle 111 is in transmission connection with the first transmission assembly 23, the main shaft of the driving motor 21 is connected to the first transmission assembly 23, and the main shaft is also connected with the belt 42. The first transmission assembly 23 converts the rotational motion of the main shaft of the driving motor 21 into the reciprocating motion of the sewing needle in the length direction.

It will be appreciated that the first transmission assembly 23 is located inside the main body 1 and is shielded by the main body 1. Although the first transmission assembly 23 is a structure commonly used in sewing machines, for the convenience of understanding the present application, the structure of the first transmission assembly 11 is exemplified as follows:

referring to fig. 3, the first transmission assembly 23 may include a first rotation lever 231, a cam 232, and a connection shaft 233. One end of the first rotating lever 231 is provided with a mounting hole and is fixed with the main shaft of the driving motor 21 through the mounting hole matching with the shaft sleeve, and the other end of the first rotating lever 231 is provided with a cam 232 through the shaft sleeve. Meanwhile, a connecting shaft 233 can be connected to the side, close to the circumference, of the cam 232, far from the first rotating rod 231, one end, far away from the cam 232, of the connecting shaft 233 can be connected with a sewing needle 111 through a shaft sleeve, and a limiting cylinder 113 can be sleeved on the outer side of the sewing needle 111. The limiting cylinder 113 is integrally welded to the inside of the main body 1, so that the sewing needle 111 is ensured to reciprocate along the length direction of the limiting cylinder 113.

When the driving motor 21 operates, the first rotating lever 231 is rotated by the main shaft, and the first rotating lever 231 is rotated by the driving cam 232. The circumference of the cam 232 far away from the center of the circle is connected with a connecting shaft 233, so that the sewing needle 111 can reciprocate along the length direction of the limiting cylinder 113 under the limiting action of the limiting cylinder 113, and the sewing work is realized by matching with the winding mechanism 12.

It should be emphasized that the above description of the structure of the first transmission assembly 23 is merely illustrative, and that the structure of the first transmission assembly 23 is different from the conventional sewing machine. And the structure of the first transmission assembly 23 is not within the scope of the present application, the description of other types of first transmission assemblies 23 will not be repeated.

In the present embodiment, the support mechanism 22 may include a support portion of a plate-like structure. At this time, one end/side of the support portion and the side panel 13 may be connected by welding or bolts, and one end/side of the support portion remote from the side panel 13 and the driving motor 21 may be connected by bolts.

Alternatively, the support 22 may be at least one or more fixing rods in order to reduce the weight. One end of the fixing rod may be connected to the side panel 13 by welding or bolting, and the other end is fixedly connected to the driving motor 21 by bolting or welding.

In the above-described embodiment, further weight reduction can be achieved by changing the plate shape to a rod shape. Meanwhile, the number of the fixing rods can be 2-4, so that the strength of the whole structure is ensured.

In the present embodiment, the thread winding mechanism 12 functions to perform a sewing operation in cooperation with the thread winding of the sewing needle 111. In practical applications, the structure of the winding mechanism 12 may be different depending on the type of sewing machine.

For ease of understanding of the embodiments of the present application, a typical winding mechanism 12 is provided below in conjunction with fig. 3 and 4.

The winding mechanism 1 includes: an input shaft 121, a spool 122, and a second transmission assembly 123 respectively connecting the input shaft 121 and the spool 122.

In specific use, the input shaft 121 penetrates through the second through hole 1331 and can be connected with the second transmission assembly 123 through the shaft sleeve, the axis of the wire spool 122 is perpendicular to the axis of the input shaft 121, and the wire spool 122 is opposite to the sewing needle 111; the second transmission assembly 123 converts the rotational movement of the input shaft 121 in the circumferential direction thereof into the rotational movement of the spool 122 in the circumferential direction thereof.

In this application, the second through hole 1331 is provided to accommodate insertion of the input shaft 121 into the interior of the winding mechanism 12. And for a more detailed description of the function of the second through hole 1331, it is described in connection with fig. 1:

it is assumed that the second through hole 1331 is not provided, and at this time, the second pulley 43 of the belt 42 needs to be directly placed on the side of the side panel 13 away from the winding mechanism 12. At this time, the second transmission assembly 123 is connected to the belt 42 through the input shaft 121, resulting in a widening of the overall structure of the sewing machine, which is disadvantageous in terms of weight reduction.

That is, the second through hole 1331 is provided, so that the weight can be reduced, the whole structure width of the sewing machine can be reduced, and the occupied area can be reduced.

It will be appreciated that the second transmission assembly 123 in fig. 4 is only a schematic illustration. Since the structure of the second transmission assembly 123 is very large in the conventional sewing machine, a detailed description thereof will not be provided herein.

Specifically, in the embodiment of the present application, referring to fig. 1, the pulley assembly 4 further includes a first rotating wheel 41 and a second rotating wheel 43.

Wherein the first rotating wheel 41 is sleeved on the main shaft of the driving motor 21; the second rotating wheel 43 can be sleeved on the input shaft 121 of the winding mechanism 12; the belt 42 has both ends connected to the first rotating wheel 41 and the second rotating wheel 43, respectively.

The belt 42 is provided with a higher safety than the conventional sewing machine drive rod arrangement. Therefore, the protective shell does not need to be additionally arranged, and the whole weight of the sewing machine is ensured to be reduced.

In order to facilitate understanding of the sewing machine of the present application, a method for using the sewing machine disclosed in the present application is specifically described below, which comprises the following steps:

1) Firstly, placing an article to be sewn on the top of a winding mechanism 12, and pulling a needle thread on a sewing needle;

2) Starting the driving motor 21, driving the driving motor 21 to drive the first rotating rod 231 to rotate, wherein the first rotating rod 231 is matched with the gear plate 25 through the first rotating gear 24, and the gear plate is driven to reciprocate in the length direction; the sewing needle 111 thus reciprocates in its own longitudinal direction;

3) The sewing needle 111 reciprocates along its length direction, and at the same time, the driving motor 21 drives the first rotating wheel 41 on the main shaft to rotate, the first rotating wheel 41 drives the second rotating wheel 43 to rotate together through the belt 42, and the second rotating wheel 43 is connected with the input shaft 121, so that the input shaft 121 rotates along with it. The input shaft 121 drives the wire spool 122 to rotate through the second transmission assembly 123, and cooperates with the sewing needle 111 to perform sewing work;

4) After the sewing work is finished, the sewn object is taken down;

5) The tension wheel is abutted against the belt 42 of the sewing machine, so that the belt 42 is in a tension state, and the problem that the belt 42 falls off due to service life exhaustion and deformation after long-term use is solved.

In the above scheme, through the arrangement of the belt 42, the driving motor 21 can simultaneously drive the sewing needle 111 to work together with the wire spool 122, and meanwhile, articles such as a protective shell are not required to be installed, so that the weight is greatly reduced. The tensioning device is arranged on the sewing machine to support the belt 42, so that the service life of the belt 42 is prolonged, and the cost is saved.

Second embodiment

The applicant has found that by properly adjusting the tension roller 71 according to the degree of deformation of the belt 42, it is possible to ensure that the belt 42 is always kept in a tensioned state.

In view of this, the second embodiment of the present application improves on the first embodiment. Referring to fig. 11 and 12, the improvement is that: the base 72 may also include a slider 722 and a slide rail 723.

Wherein the rotation shaft 721 is disposed on the slider 722 by a bolt, and the slider 722 is disposed on the slide rail 723 so that the tensioner 71 is moved closer to or farther away from the belt 42.

The slide rail 723 may be detachably mounted to the sewing machine by means of bolts or screws. The slider 722 is placed in the sliding region of the slide rail 723 and slidingly coupled.

In addition, referring to fig. 15, the base 72 may further include a tightening piece 725, the tightening piece 725 for tightening the slider 722.

The fastener 725 may be a bolt, a pin, or the like. To facilitate understanding of the connection manner of the fastening member 725 and the slider 722, the following description uses the fastening member 725 as a pin shaft for illustration:

a first pin hole is provided in the slider 725, and a first pin hole is provided in the slide rail 723 or the sewing machine. When the slider 722 needs to be fixed, the first pin hole and the second pin hole are aligned, and the pin shaft is inserted.

It should be emphasized that the sliding rail 723 in the embodiment of the present application may be a cavity structure having a receiving space. And a side surface of the slide rail 723, which is close to the tensioner 71, and a side surface of the slide rail, which is far away from the sewing machine, may be open.

As a preferable solution, the sliding rail 723 may be a groove formed on the sewing machine, so as to reduce the weight of the sewing machine.

Embodiment III

With continued use of the sewing machine, the belt 42 is more heavily loaded and gradually deforms with a longer drive. Therefore, the third embodiment of the present application is modified from the second embodiment so that the tensioner 71 moves with the deformation of the belt 42, and the tensioner 71 is always held against the belt 42. Referring to fig. 11 and 12, the main improvement of the present embodiment is that:

the base 70 further includes a spring 724, one end of the spring 724 is oppositely connected to the inner side of the slide rail or the sewing machine through a bolt or a screw, and the other end is connected to a slider 722.

It will be appreciated that the manner in which the screw connection is achieved may be: and (3) forming a blind hole on the sliding rail or the sewing machine, and then driving a screw.

When the belt 42 and the tensioner are mounted on the sewing machine, the tensioner 721 is pressed against the belt 42, and is simultaneously pressed by the belt 42 and the supporting force from the spring 724, and the belt 42 and the tensioner are in a force balance state. When the belt 42 is deformed gradually, the tension wheel 721 receives a smaller pressure of the belt 42, and the spring 724 returns from the compressed state to maintain the force balance. The spring 724 lengthens and drives the slider 722 to slide on the sliding rail 723, so that the slider 722 is positioned at a new stress balance point. During this process, the belt 42 is kept in a stretched state under the action of its own elastic force and spring elastic force.

It should be noted that the belt 42 may become loose and fall out as it runs out of life and deforms gradually. However, in this embodiment, the spring 724 is provided to be gradually lengthened as the belt 42 is loosened, and pushes the slider 722 to slide on the slide rail 723, thereby moving the tensioner 71 toward the belt 42. Since the tension roller 71 is tightly abutted against the belt 42, the belt 42 can be tightly fixed on the first rotating roller 41 and the second rotating roller 43 after being loosened and lengthened, and the service life of the belt is remarkably prolonged.

Fourth embodiment

The embodiment of the present application is improved based on the second application mode. Referring to fig. 12, 14 and 16, the improvement is that:

the base 72 also includes a telescoping member 726.

The telescopic end of the telescopic member and the sliding block 722 can be connected through bolts or screws, and the other end of the telescopic member can be connected through bolts or screws

The telescopic component 726 can drive the sliding block 722 to move along the sliding rail 723 under the drive of a telescopic power source so as to enable the tensioner to better abut against the tensioner.

The telescopic member 726 may be a cylinder, a telescopic rod, or the like.

When the belt 42 is deformed, the driving slider 722 moves on the slide rail 723 by adjusting the telescopic member 726. The slider 722 moves to drive the tensioner 721 to abut against the belt 42 through the rotation shaft 721.

In order to make the tension roller 71 abut against the belt 42 more precisely, as shown in fig. 12, in this embodiment, the base 72 may further include a pressure sensor 727, where a fixing groove is formed at the connection between the rotation shaft 721 and the tension roller 71, and the pressure sensor 727 is disposed at the position of the fixing groove at the connection between the rotation shaft 721 and the tension roller 71.

In the present embodiment, the pressure sensor 727 is configured to detect the pressure applied to the rotary shaft 721 in real time, and the pressure sensor 727 is connected to the telescopic power source in a communication manner.

It is appreciated that the pressure sensor 727 may be communicatively coupled to the telescoping power source via a PLC controller. That is, the pressure sensor 727 is connected to the PLC controller in communication, and detects the pressure and transmits it to the PLC controller in real time. The PLC controller is in communication connection with the telescopic power source, and sends corresponding control instructions to the telescopic power source to realize the work of the telescopic component 726.

It is emphasized that the PLC controller may be provided on the sewing machine or on the robotic arm, or may be provided separately from the outside. The PLC controller receives pressure data to control the operation of the telescoping member 726, a part of the control principle which is well known in the art and will not be described in any greater detail herein.

When the belt 42 is deformed, the force between the belt 42 and the tensioner 71 becomes smaller. At this time, the pressure between the tensioner 7 and the rotary shaft 721 also changes. When it is detected that the pressure between the tensioner 71 and the rotary shaft 721 is less than a preset pressure threshold Px, the telescopic power source is started, and the telescopic member 726 is extended. When the telescopic member 726 extends towards the belt direction, the driving slider 722 moves on the sliding rail 723, and the slider 722 is connected with the tensioner 71 through the rotating shaft 721, so that the tensioner 71 moves along the direction towards the belt 42, and the tensioner 71 is ensured to be abutted against the belt 42 more tightly. The pressure threshold Px may be set according to the actual situation.

For the convenience of understanding the embodiments of the present application, the following detailed description will be given:

1) The components are installed, so that the tension wheel 71 is abutted against the belt 42;

2) The pressure sensor 727 detects the pressure applied to the rotating shaft 721 by the tensioner 71 in real time, the pressure detected at the time t1 is P1, and P1 is greater than the pressure threshold value Px, and the belt 42 is in a tensioned state at this time;

3) The sewing machine is started to operate, and the pressure sensor 727 continuously monitors the pressure applied to the rotating shaft 721 by the tensioner 71 in real time and transmits the pressure to the PLC controller 727. When the pressure Pn received by the PLC controller 727 is smaller than the pressure threshold Px at time tn, the PLC controller 727 sends a control command to control the telescopic power source to drive the telescopic component 726 to extend, and push the slider 722 to slide on the sliding rail 723 towards the direction of the belt 42, so that the pressure between the tensioner 71 and the belt 42 is increased until the pressure is larger than the pressure threshold Px and reaches the preset pressure threshold Py. In the present embodiment, the pressure threshold Py is smaller than the pressure threshold Px, so that the tensioner 71 can be tightly abutted against the deformed belt 42.

When the PLC controller 727 receives that the pressure value reaches the preset pressure threshold Py, the PLC controller 727 can issue a command to control the telescopic power source to stop working, so that the telescopic member 726 maintains the current length.

Through the scheme, the pressure between the tension wheel 71 and the belt 42 is larger than or equal to the pressure threshold Py, so that the tension wheel 71 is ensured to tightly abut against the belt 42 all the time, and the problem that the belt 42 falls off due to loosening and deformation after long-term use is effectively solved.

In the present embodiment, the pressure between the tensioner 71 and the rotary shaft 721 is generated by the pressure transmission between the belt 42 and the tensioner 721. When the pressure between the tensioner 71 and the rotating shaft 721 is smaller than the pressure threshold Px, it is indicated that the tensioner 71 is not tightly abutted against the belt 42, and the belt 42 may be loosened. Accordingly, the tension roller 721 can be moved toward the belt 42 by the pressure applied by the expansion and contraction member 726, and the pressure between the tension roller 71 and the belt 42 can be increased to the pressure threshold Py. In this way, the belt 42 may be extended in service life by the telescoping member 726.

Compared with the elastic component, such as the spring 724, the force application direction of the telescopic component 726 is easier to control, the supporting force of the telescopic component 726 is not changed like the elastic component due to the change of the stroke of the telescopic component 726, and the stability is better. Those skilled in the art will appreciate that the operation of the sewing machine requires a precise fit of the sewing needle and 111 and the spool 122, which is extremely sensitive to changes in tightness of the belt 42. In the process of sewing for luxury goods leather items, very small errors can all involve significant cost losses. By applying pressure to the belt 42 by the telescopic component 726, the service life of the belt 42 is remarkably prolonged, meanwhile, the working stability of the sewing machine can be improved, and the yield of products is improved.

In addition, compared with the conventional sewing operation of the sewing machine, when the sewing machine is applied to the mechanical arm to perform the three-dimensional sewing operation, the requirement on the stability of the sewing machine during operation is higher. The expansion part 726 is stretched to tightly support the tension wheel 41 against the belt 42, and the expansion part 726 is usually a rigid part (such as an expansion rod, an air cylinder, etc.), so that no external force or self-cause changes in self-travel, the tension wheel 71 is tightly supported against the belt 42 all the time, and the stability of the sewing machine when being applied to a mechanical arm for three-dimensional sewing operation is ensured.

Fifth embodiment

In the actual production process, the applicant has found that the sewing machine can still be further reduced in weight.

In view of this, referring to fig. 1 and 5, the embodiment of the present application is modified on the basis of the fourth embodiment, and the modification mainly includes:

the side panel 13 may include a first flat plate portion 131, a connection portion 132, and a second flat plate portion 133.

Wherein, the supporting mechanism 22 may be connected to the first flat plate portion 131, and the first through hole 1311 may be formed in the first flat plate portion 131 and corresponds to the first rotating wheel 41; the second plate portion 133 is provided with a second through hole 1331 for the input shaft 121 to pass through.

One end of the connection portion 132 may be fixedly connected to the first plate portion 131 by welding, and the other end of the connection portion may be connected to the second plate portion 132 by welding. In addition, in order to reduce the weight, the connecting portion 132 has a hollow hole 1321; or alternatively, the process may be performed,

the scheme can realize that the side panel 13 with the original plate-shaped structure is replaced by an I-shaped structure, and the weight is further reduced on the basis of ensuring the structural strength.

Still further, referring to fig. 6, the connection portion 132 may be formed as at least one straight bar.

The weight can be reduced to the greatest extent by a straight rod. However, in order to ensure strength, the connection portion 132 is preferably two straight bars, and the two straight bars are parallel or crossed, and the two ends of the two straight bars are respectively connected to the first plate portion 131 and the second plate portion 133 by welding.

For securing the strength, referring to fig. 7, when there are two connection portions 132, the reinforcing ribs 134 may be connected by welding at positions where the two connection portions are close to each other. The overall structure of the side panel 13 is light in weight and has better stability.

Through the scheme, the structure strength can be increased, and the weight can be reduced to the greatest extent.

Embodiment six

The applicant found that the reduced sewing machine can be connected with a mechanical arm and other devices, and can realize three-dimensional sewing operation after being combined with the mechanical arm.

In view of this, the embodiments of the present application are modified on the basis of the above-described embodiments. The improvement is that the device also comprises a connecting piece 3. The connecting piece 3 can be attached to the side of the body 1 remote from the winding mechanism 12 by welding or by bolts or by screws.

The connector may be any multi-terminal connection structure known in the art. The present application gives an example, as shown in fig. 1 and 8, the connector 3 may include a connector holder 31, a peripheral plate 32, and a cover plate 33.

Wherein the cover plate 33 is attached to the side of the main body 1 away from the winding mechanism 12 (i.e., the top in fig. 1) and may be fixedly connected by welding or bolts, and the side of the cover plate 33 away from the main body 1 and the side of the connection seat 31 may be connected by welding or bolts. The side of the connecting seat 31 facing away from the cover plate 33 and the peripheral plate 32 may be connected by welding or by bolts. The first fixing hole 311 and the second fixing hole 331 may be respectively formed at the positions of the connecting seat 31 and the cover plate 33 near the center, and the connecting position of the mechanical arm 5 may be inserted into the first fixing hole 311 and the second fixing hole 331 and may be connected by using bolts or shaft sleeves.

In order to reduce the weight, the number of the peripheral side plates 32 is preferably two, and the structural strength of the connector 3 can be ensured while the weight is reduced.

Compared with the existing sewing machine, the sewing machine in the embodiment of the application is light in weight, and can be applied to the mechanical arm 5 or other external equipment to perform three-dimensional sewing operation.

Embodiment seven

In the practical application trial use process, the applicant finds that when the connecting piece 3 is arranged at the gravity balance point position of the sewing machine, the whole service life of the device can be prolonged. For ease of understanding, see fig. 9;

wherein the weight of the first end 62 of the sewing machine is greater than the weight of the second end 63 of the sewing machine. At this time, the whole sewing machine body tends to rotate counterclockwise. When the connecting piece 3 is arranged at the gravity balance point position of the sewing machine, the gravity of the first end 62 of the sewing machine is the same as the gravity of the second end 63 of the sewing machine, and the reverse rotation trend is not generated.

For this reason, in the embodiment of the present application, the connecting member 3 is disposed at a gravity balance point position of the sewing machine 1 parallel to the side panel 13, and ensures that the weight of both sides of the connecting portion 61 is the same when the connecting portion is connected to the arm 5.

In order to ensure that the weights of the two sides of the sewing machine are the same at the connecting position of the mechanical arm of the sewing machine, the specific installation is limited to a certain extent. Because of the variety of sewing machines, other parts may be mounted at the gravity balance point of a conventional sewing machine. At this time, the position of the gravity balance point of the sewing machine needs to be adjusted.

At this time, the driving motor 21 can be placed on the side surface of the side body 1, and the weight of the whole sewing machine can be balanced. The weight of the sewing machine can be changed by adjusting the weight of the side panel 13, such as a plurality of through holes, or by hollowing out part of the grooves on the main body 1. Therefore, the mounting position of the connecting piece 3 can be adjusted according to actual needs, the connecting piece is better convenient to connect with the mechanical arm 5, and three-dimensional sewing operation is performed.

Finally, it should be noted that those skilled in the art will understand that many technical details are presented in the embodiments of the present application in order to better understand the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above embodiments. Accordingly, in actual practice, various changes may be made in the form and details of the above-described embodiments without departing from the spirit and scope of the present application.

Claims (10)

1. A tensioning device, the tensioning device comprising:

the belt conveyer comprises a tension wheel and a base, wherein the tension wheel is arranged on the base, and the base is arranged beside a belt of a sewing machine and enables the tension wheel to be propped against the belt;

the two ends of the belt are respectively connected with the thread winding mechanism and the main driving shaft of the sewing machine so as to drive the sewing needle and the thread winding mechanism of the sewing machine to synchronously move.

2. The tensioning device of claim 1, wherein the base comprises: the rotating shaft is fixed on the sewing machine, and the tensioning wheel is sleeved on the rotating shaft and can rotate freely on the rotating shaft.

3. The tensioning device of claim 2, wherein the base further comprises: a slide block and a slide rail;

the rotating shaft is arranged on the sliding block, and the sliding block is arranged on the sliding rail so that the tensioning wheel can be close to or far away from the belt.

4. A tensioning device as defined in claim 3, wherein the base further comprises: and one end of the spring is relatively fixed, and the other end of the spring is connected with the sliding block.

5. A tensioning device as defined in claim 3, wherein the base further comprises: and the fastening piece is used for fastening the sliding block.

6. A tensioning device as defined in claim 3, wherein the base further comprises: the telescopic component can drive the sliding block to move along the sliding rail under the driving of the telescopic power source.

7. The tensioning device of claim 6, wherein the base further comprises: the pressure sensor is used for detecting the pressure born by the rotating shaft, and is in communication connection with the telescopic power source.

8. A sewing machine, comprising:

the main body is provided with a machine head, and a sewing needle is arranged on the machine head;

the winding mechanism is arranged opposite to the machine head;

the driving motor and the main driving shaft are arranged on the driving motor, and the main driving shaft is connected into the machine head and drives the sewing needle to reciprocate;

the two ends of the belt are respectively connected with a winding mechanism and a main driving shaft of the sewing machine so as to drive a sewing needle and the winding mechanism of the sewing machine to synchronously move;

a tensioning device as defined in any one of claims 1 to 7 mounted to said body and exerting a force on said strap to tension said strap.

9. The sewing machine of claim 8, wherein the body further comprises:

a side panel mounted on a side of the body remote from the handpiece, the winding mechanism having an input shaft;

the side panel is provided with a first through hole and a second through hole, the first through hole is used for the main driving shaft to pass through, and the second through hole is used for the input shaft to pass through;

the main driving shaft and the input shaft are provided with belt pulleys which are positioned on the same side of the side panel, and the belt is connected with the belt pulleys; the base is disposed on the side panel.

10. The sewing machine of claim 9, wherein the belt and the tensioner are both located on a side of the side panel remote from the head;

and the base is detachably connected with the side panel.

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