CN219099521U

CN219099521U - Bottom thread-free mechanism of sewing machine

Info

Publication number: CN219099521U
Application number: CN202222758149.9U
Authority: CN
Inventors: 郑贤
Original assignee: Wenzhou Xinjia Precision Machinery Co ltd
Current assignee: Wenzhou Xinjia Precision Machinery Co ltd
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2023-05-30
Anticipated expiration: 2032-10-19

Abstract

The utility model discloses a bottom line free mechanism of a sewing machine, which is technically characterized by comprising a machine body and a base for bearing the machine body, wherein the machine body comprises a main shaft and a driving mechanism, the driving mechanism comprises a rotating disc, a swinging rod, a needle bar and a connecting rod, the rotating disc is fixedly connected with the main shaft, one end of the swinging rod is hinged with the machine body, the other end of the swinging rod can swing around a hinging point, one end of the connecting rod is eccentrically arranged with the rotating disc and is rotationally connected with the rotating disc, the other end of the connecting rod is connected with the needle bar, one end of the connecting rod connected with the needle bar is also provided with a sliding pin, the swinging rod is provided with a sliding groove, and the sliding pin is in sliding connection with the sliding groove; the utility model discloses a thread hooking device, which is characterized in that a transmission shaft which rotates synchronously with a main shaft is arranged in a base, a chain wheel is arranged at the end part of the transmission shaft, a thread hooking wheel is arranged above the chain wheel, the thread hooking wheel comprises a chain wheel part and a hook body, the chain wheel part is connected with the chain wheel through a chain, and the surface of the hook body is of a smooth arc-shaped structure.

Description

Bottom thread-free mechanism of sewing machine

Technical Field

The utility model relates to the technical field of sewing machines, in particular to a bottom-thread-free mechanism of a sewing machine.

Background

The sewing machine is provided with a rotating shuttle at the lower side of the needle plate. The rotating shuttle comprises an outer shuttle frame and an inner shuttle frame. The outer bobbin holder rotates integrally with the shaft along with the up-and-down movement of the needle, and rotatably supports the inner bobbin holder. The inner bobbin holder is rotatable independently of the outer bobbin holder and includes a shuttle stopping portion at an outer peripheral portion thereof. The shuttle stopping part is clamped with a shuttle stopping sheet included in the sewing machine and used for stopping the rotation of the inner shuttle frame, so that the inner shuttle frame cannot rotate with the outer shuttle frame in a driven mode. The upper thread is threaded into the needle eye of the needle. The sewing machine uses the outer shuttle frame to catch the upper thread of the needle passing through the cloth, and interweaves the upper thread with the bottom thread held by the inner shuttle frame in a stopped state to perform sewing. The problem with this kind of traditional structure is that, because the inside space of interior shuttle frame is limited, therefore, the volume of the bobbin thread that its held is very limited, when products such as shoes package are made up, need often open interior shuttle frame and change the bobbin thread, and complex operation has influenced sewing efficiency.

In order to solve the above-mentioned problems, chinese patent publication No. CN2268040Y discloses a bottomless bobbin type sewing machine, in which a thread hook is used to replace a bobbin, when the thread hook is rotated by a sewing machine, the hook body of the thread hook is hooked into a loop formed by a needle thread, and when the loop is rotated away, the loop is sleeved on the loop hooked by the next action to form a sleeve sewing of the loop on the bottom of the sewing machine, so that a rotating shuttle for supplying the bottom thread is not required to be provided.

However, the prior art still has some defects in use: after the mode of a thread hook is adopted to replace the mode of a rotating shuttle, the stroke of a needle can be reduced because the rotating shuttle is not required to provide a bottom thread, and the stroke of a corresponding thread take-up lever is also required to be reduced, but the prior art still adopts a traditional driving mechanism to drive the needle to move, so that the problems of over-tightening and thread clamping can occur when the thread hook is pulled, and the driving mechanism of the needle needs to be improved; meanwhile, the structure of the thread hook needs to be adjusted so that the movement of the suture thread is smoother.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides a thread-backing-free mechanism of a sewing machine, which is matched with the stroke of a thread hook wheel when in use, so that the problem of overtightening of a thread can be avoided, and the thread hook wheel is smoother in thread hooking.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a sewing machine exempts from bobbin thread mechanism, includes the organism and is used for bearing the base of organism, including the main shaft in the organism, be provided with the actuating mechanism that is used for driving the reciprocating motion of needle, its characterized in that on the main shaft: the driving mechanism comprises a rotating disc, a swinging rod, a needle bar and a connecting rod, wherein the rotating disc is fixedly connected with the main shaft, one end of the swinging rod is hinged with the machine body, the other end of the swinging rod can swing around a hinge point, one end of the connecting rod is eccentrically arranged with the rotating disc and is rotationally connected with the rotating disc, the other end of the connecting rod is connected with the needle bar, one end of the connecting rod connected with the needle bar is also provided with a sliding pin, the swinging rod is provided with a sliding groove, and the sliding pin is in sliding connection with the sliding groove; the novel hook comprises a base, wherein a transmission shaft which rotates synchronously with a main shaft is arranged in the base, a chain wheel is arranged at the end part of the transmission shaft, a wire hook wheel is arranged above the chain wheel, the wire hook wheel comprises a chain wheel part and a hook body, the chain wheel part is connected with the chain wheel through a chain, and the surface of the hook body is of a smooth arc structure.

The utility model is further provided with: the needle bar is also provided with a thread take-up lever which extends out of the side wall of the machine body and can reciprocate up and down under the drive of the needle bar.

The utility model is further provided with: the hook body is provided with a groove, and the needle can be inserted into the groove in the descending process.

The utility model is further provided with: the needle is fixedly provided with a deconcentrator, and the deconcentrator is provided with a through hole, so that the sewing thread passes through the through hole and then is connected to the needle hole of the needle.

The utility model is further provided with: the through holes are arranged in a staggered mode with the needle holes of the machine needle.

In summary, the utility model has the following beneficial effects:

compared with the prior art, the needle bar is controlled to move through the rotating disc matched with the connecting rod and the swinging rod, and the connecting rod is eccentrically connected with the rotating disc, so that the connecting rod is driven to move circularly in the rotating process of the rotating disc, the swinging rod is driven to swing left and right, the needle bar is driven to move up and down at the same time, the thread taking-up rod is arranged on the needle bar and is driven to move synchronously, the stroke of the thread taking-up rod is required to be longer, and a connecting rod mechanism is usually additionally arranged to be connected with the rotating disc to drive the thread taking-up rod to move, and the thread hooking wheels are adopted to form a plurality of coils through the sewing threads on the needle, and the head and the tail of the coils are mutually twisted together, so that the stroke is reduced and the structure is simplified by adopting the driving mechanism of the utility model.

Meanwhile, the groove is formed in the hook body, the deconcentrator is arranged at the needle position, the deconcentrator and the needle hole of the needle are arranged in a staggered mode, when the sewing thread extends from the deconcentrator to the needle hole of the needle, the gap between the sewing thread and the needle is larger, so that the hook on the hook body can more easily penetrate through the gap to hook the sewing thread, the groove is arranged to enable the needle to extend into a position more inside, the gap of the sewing thread is closer to the deconcentrator, namely, the gap is wider, the thread hooking process is smoother through the arrangement of the groove and the deconcentrator, and the use is convenient.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic diagram showing the front view of the wire hook wheel of the present embodiment;

FIG. 3 is a schematic view of the sprocket portion structure of the present embodiment;

FIG. 4 is a schematic side view of the wire hook wheel of the present utility model;

FIG. 5 is a schematic view of the structure of the groove of the hook wheel of the present utility model;

FIG. 6 is a schematic view of the structure of the wire divider and the wire hook wheel of the present utility model.

Reference numerals: 1. a body; 2. a main shaft; 3. a driving mechanism; 4. a rotating disc; 5. swing rod; 501. a chute; 6. a needle bar; 601. a slide pin; 7. a needle; 8. a sprocket; 9. a wire hook wheel; 901. a sprocket section; 902. a hook body; 10. a thread take-up lever; 11. a groove; 12. a connecting rod; 13. a base; 14. a wire divider; 15. and a through hole.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

The embodiment discloses a sewing machine bottom-thread-free mechanism, as shown in fig. 1-5, the sewing machine bottom-thread-free mechanism comprises a machine body 1 and a base 13 for bearing the machine body 1, a main shaft 2 is arranged in the machine body 1, a driving mechanism 3 for driving a needle to reciprocate is arranged on the main shaft 2, the driving mechanism 3 comprises a rotating disc 4, a swinging rod 5, a needle rod 6 and a connecting rod 12, the rotating disc 4 is fixedly connected with the main shaft 2, one end of the swinging rod 5 is hinged with the machine body 1, the other end can swing around a hinging point, one end of the connecting rod 12 is eccentrically arranged with the rotating disc 4 and is rotationally connected, the other end is connected with the needle rod 6, one end of the connecting rod 12 connected with the needle rod 6 is also provided with a sliding pin 601, the swinging rod 5 is provided with a sliding groove 501, the sliding pin 601 is slidably connected with the sliding groove 501, the needle rod 6 is also provided with a thread picking rod 10 which extends out of the side wall of the machine body 1 and can reciprocate up and down under the driving of the needle rod 6; therefore, the eccentric connecting rod 12 is driven to move by the rotation of the rotating disc 4, the connecting rod 12 drives the needle rod 6 to move due to the fact that the rotating disc 4 and the needle rod 6 are respectively connected at the two ends of the connecting rod 12 in a rotating mode, and the connecting rod 5 is provided with a sliding groove at the swinging end, and a sliding pin 601 sliding in the sliding groove 501 is arranged at the connecting part of the connecting rod and the needle rod 6, so that the needle rod 6 moves up and down in a reciprocating mode and swings left and right in a certain range under the constraint of the connecting rod 12, meanwhile, the thread taking-up rod 10 is connected with the needle rod 6 to synchronously move up and down in a reciprocating mode.

Further, a transmission shaft which rotates synchronously with the main shaft is arranged in the base 13, the transmission shaft can be connected with the main shaft through a transmission mechanism such as a gear, if the main shaft is driven by a motor, the transmission shaft can also be controlled to rotate by adopting the motor which rotates synchronously with the main shaft, a chain wheel 8 is arranged at the end part of the transmission shaft, a wire hook wheel 9 is arranged above the chain wheel 8, the wire hook wheel 9 comprises a chain wheel part 901 and a hook body 902, the chain wheel part 901 is connected with the chain wheel 8 through a chain, and therefore, when the chain wheel 8 rotates, the wire hook wheel 9 also rotates in a stepping way; the hook body 902 is provided with the groove 11 on the surface, the needle 7 can be inserted into the groove 11 in the descending process, when the hook body 902 is used, the needle 7 is provided with a sewing thread, when the needle 7 stretches into the thread hook wheel 9, the hook structure on the hook body 902 hooks the sewing thread, then the needle 7 rises, the thread hook wheel 9 continues to rotate, the sewing thread is hooked on the arc-shaped outer surface of the hook body 902, when the needle 7 stretches into the thread hook wheel 9 for the second time, the hook mechanism on the hook body 902 hooks the sewing thread again, the sewing thread hooked for the first time just turns a whole circle, the formed loops are separated from the surface of the hook body 902, the formed loops are lapped on the sewing thread hooked for the second time, namely, the sewing thread forms individual loops through the thread hook wheel 9, and the loops are twisted together head and tail, so that the condition that the base thread is required to be replaced in the prior art is avoided, and the use is more convenient.

Further, referring to fig. 6, a deconcentrator 14 is fixedly arranged on the needle 7, a through hole 15 is arranged on the deconcentrator 14, so that the sewing thread passes through the through hole 15 and then is connected to the needle hole of the needle 7, the through hole 15 and the needle hole of the needle 7 are arranged in a staggered manner, the gap between the sewing thread at the needle 7 is larger through the arrangement of the deconcentrator 14, the hook structure on the hook body 902 is easier to hook the sewing thread, the use is smoother, and the thread hooking wheel can also smoothly hook the thread continuously during the rapid sewing operation.

The above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the design concept of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a sewing machine exempts from bobbin thread mechanism, includes organism (1) and is used for bearing base (13) of organism (1), including main shaft (2) in organism (1), be provided with on main shaft (2) and be used for driving actuating mechanism (3) of needle reciprocating motion, its characterized in that: the driving mechanism (3) comprises a rotating disc (4), a swinging rod (5), a needle rod (6) and a connecting rod (12), wherein the rotating disc (4) is fixedly connected with the main shaft (2), one end of the swinging rod (5) is hinged with the machine body (1), the other end of the swinging rod can swing around a hinging point, one end of the connecting rod (12) is eccentrically arranged with the rotating disc (4) and is rotationally connected, the other end of the connecting rod is connected with the needle rod (6), one end of the connecting rod (12) connected with the needle rod (6) is further provided with a sliding pin (601), a sliding groove (501) is formed in the swinging rod (5), and the sliding pin (601) is in sliding connection with the sliding groove (501); be equipped with in base (13) with main shaft synchronous rotation's transmission shaft, the tip of transmission shaft is provided with sprocket (8), sprocket (8) top is provided with line hook wheel (9), line hook wheel (9) are including sprocket portion (901) and shank (902), sprocket portion (901) are connected through the chain with sprocket (8), shank (902) surface is smooth arc structure.

2. The sewing machine bottom-free thread mechanism of claim 1, wherein: the needle bar (6) is also provided with a thread take-up lever (10), and the thread take-up lever (10) extends out of the side wall of the machine body (1) and can reciprocate up and down under the drive of the needle bar (6).

3. The sewing machine bottom-free thread mechanism of claim 1, wherein: the hook body (902) is provided with a groove (11), and the needle (7) can be inserted into the groove (11) in the descending process.

4. The sewing machine bottom-free thread mechanism of claim 1, wherein: the needle (7) is fixedly provided with a deconcentrator (14), and the deconcentrator (14) is provided with a through hole (15) so that a sewing thread passes through the through hole (15) and then is connected to a needle hole of the needle (7).

5. The sewing machine bottom-free thread mechanism of claim 4, wherein: the through holes (15) are arranged in a staggered mode with the needle holes of the machine needle (7).