CN112030391B

CN112030391B - Threading apparatus and industrial sewing machine using threading apparatus

Info

Publication number: CN112030391B
Application number: CN202010848114.7A
Authority: CN
Inventors: 江红霞; 林婧雅
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-07-27
Anticipated expiration: 2040-08-21
Also published as: CN112030391A

Abstract

The invention discloses a threading device of a sewing machine and an industrial sewing machine applying the threading device, aiming at the requirement of automatic threading under the high-strength eye state in sewing production based on the spring elastic deformation and the magnetic principle, the developed threading device of the industrial sewing machine is taken as an independent part and can be selectively assembled with the industrial sewing machine. The developed threading device of the industrial sewing machine is beneficial to reducing eye fatigue of workers, improving the accuracy of threading action and saving working time and cost. The technical scheme comprises the following steps: the thread-threading device comprises a fixed seat, wherein a thread-threading device main body is rotatably connected to the fixed seat, an included angle is formed between the initial position of the thread-threading device main body and the fixed seat, and a space formed by the included angle is used for accommodating a sewing machine needle; the threading device main body and the fixed seat are magnetically adsorbed to realize limiting; the threading device main body is provided with a flexible crochet hook for threading.

Description

Threading apparatus and industrial sewing machine using threading apparatus

Technical Field

The invention belongs to the field of textile and clothing machinery, and relates to a threading device of an industrial sewing machine based on spring elastic deformation and a magnetic principle.

Background

At present, in the textile and clothing industry, the types of industrial sewing machines are various, including flat sewing machines, chain sewing machines, overedgers, flat sewing machines, herringbone lathes, buttonholing machines, tacking machines and the like, wherein the most common machine is the industrial sewing machine. The main mechanism of the industrial sewing machine comprises a thread take-up mechanism, a feeding mechanism, a thread hooking mechanism, a needle rod mechanism and the like. These mechanisms have been largely automated, however, the threading process is still performed manually by the sewing worker. Most of the existing threading tools of the auxiliary lockstitch sewing machine are replaced by a crochet hook with stronger rigidity. After the sewing worker passes the crochet hook through the needle eye, the original path of the crochet hook hooked with the needle thread is drawn back, thereby completing the threading process. The crochet hook has simple structure, and the hand-held part is generally a plastic shell. Moreover, the product is completely independent of the flat sewing machine mechanism, and a plurality of unnecessary actions are easily generated in industrial production, thereby causing waste of production benefits.

Disclosure of Invention

The invention aims to provide a threading device of an industrial sewing machine, which is developed as an independent part based on the spring elastic deformation and the magnetic principle and aiming at the requirement of automatic threading under the high-strength eye using state in sewing production and can be selectively assembled with the industrial sewing machine. The developed threading device of the industrial sewing machine is beneficial to reducing eye fatigue of workers, improving the accuracy of threading action and saving working time and cost. The technical scheme comprises the following steps: the thread-threading device comprises a fixed seat, wherein a thread-threading device main body is rotatably connected to the fixed seat, an included angle is formed between the initial position of the thread-threading device main body and the fixed seat, and a space formed by the included angle is used for accommodating a sewing machine needle; the threading device main body and the fixed seat are magnetically adsorbed to realize limiting; the threading device main body is provided with a flexible crochet hook for threading.

Furthermore, one side of the threading apparatus main body, which is far away from the fixed seat, is connected with a finger protector, the finger protector is perpendicular to the threading apparatus main body, and the initial position of the finger protector is pointed to the sewing machine needle by the threading apparatus main body.

Further, the interior cavity of threading apparatus main part sets up, and it is equipped with the slider to slide in cavity position department, the crochet hook links to each other with the slider.

Furthermore, the slider is detachably connected with a handle, the handle penetrates through the side wall of the threading device main body, and the handle and the sewing machine needle are respectively positioned on two sides of the threading device main body.

Further, the handle is connected with the sliding block in a threaded engagement manner.

Furthermore, a spring is arranged in the hollow inner cavity of the threading device main body, two ends of the spring respectively abut against the sliding block and the inner wall of the threading device main body, and the spring is positioned on one side of the advancing direction of the sliding block.

Further, the fixing seat and the threader main body are perpendicular to each other in an initial state, and a magnet used for adsorbing the threader main body is arranged on one side, facing the threader main body, of the fixing seat.

Further, magnet is located the fixing base middle part, or is located fixing base and deviates from threading apparatus main part one side.

Furthermore, a rotating pair is connected between the threading apparatus main body and the fixing seat, and comprises a connecting piece penetrating through the threading apparatus main body and the fixing seat and a fastening piece fastened at the end part of the connecting piece.

The invention also aims to provide an industrial sewing machine which comprises a presser bar, wherein the tail end of the presser bar is detachably connected with the threader of the sewing machine.

The invention has the following beneficial effects:

the invention has simple structure and convenient use and can be manufactured by a three-dimensional printing method. It has two effects simultaneously:

1. and (4) finger protection function. When the sewing machine is not broken, the sewing machine is in an open state, and the fingers are blocked by U-shaped finger protectors on the threading device. So as to prevent the sewing machine worker from mistakenly placing the finger under the needle of the sewing machine during operation.

2. And (4) a threading function. When the sewing machine breaks the thread, the handle outside the sliding block is pushed, the sliding bearing type revolute pair of the Z-shaped fixing seat rotates, the magnet in the middle section of the fixing seat adsorbs the threading device main body, and the threading device is in a closed state at this time. At this time, the handle is pushed to move the slide block rightwards and compress the spring, and the crochet hook connected with the slide block extends out to hook the sewing thread to pass through the needle eye of the machine needle. After the threading of the crochet hook is finished, the crochet hook and the sliding block reset leftwards due to the recovery function of the elastic deformation of the spring.

After threading is finished, the threading device is pulled away through the handle, the threading device is in an inoperative state, and the first function, namely the finger protection function, is recovered.

Drawings

FIG. 1 is a front view of the threader;

FIG. 2 is a left side view of the threader;

FIG. 3 is a three-dimensional structure of the threader;

FIG. 4 is a schematic view showing the structure of the threader applied to the presser foot bar of the industrial sewing machine.

In the figure, 1, a fixed seat; 2. a threader body; 3. a slider; 4. a spring; 5. hooking a needle; 6. finger protection; 7. a machine head; 8. a presser bar; 9. a handle; 10. tack nails; 11. a magnet; 12. and (5) needle eyes.

Detailed Description

Example 1

A threader of a sewing machine is shown in figures 1-3 and comprises a fixed seat 1, wherein a threader main body 2 is arranged on the fixed seat 1 by taking the fixed seat 1 as a reference. Fixing base 1 establishes to "Z" shape, divide into and be used for fixing the fixed plate body on external sewing machine, the connection plate body of perpendicular to fixed plate body, the connection plate body deviates from the lateral buckling setting of fixed plate body, it links to each other through revolute pair rotation between kink and the threading apparatus main part 2, revolute pair in this embodiment adopts the stopper to beat the screw as the connecting piece, run through 2 sides of threading apparatus main part and the limit of buckling of fixing base 1, screw up hexagon nut as the fastener at the tip of stopper to beat the screw, make threading apparatus main part 2 can use fixing base 1 as the motion benchmark, rotate the setting.

As shown in fig. 3, the angle range of the threader body 2 rotating around the revolute pair is 0-90 °, the initial position of the threader body 2 is a position perpendicular to the connecting plate body of the fixing seat 1, and the position is also one of the limit positions of the threader body 2.

As shown in fig. 3, a magnet 11 is disposed at the middle position of the connecting plate body of the fixing base 1, and the magnet 11 may also be disposed at one side of the connecting plate body of the fixing base 1 departing from the revolute pair, so as to reduce the attraction of the magnet 11 to the threading device main body 2 when the threading device main body 2 is perpendicular to the connecting plate body of the fixing base 1. In this embodiment, in order to enable the magnet 11 to adsorb and limit the threader body 2, the magnet 11 or the magnetic metal is disposed inside or on the outer wall of the threader body 2. The magnet 11 in this embodiment is annular and is fixed on the fixing base 1 by a tack 10.

As shown in fig. 3, the middle of the threader main body 2 is hollowed, a slide block 3 is arranged at the hollowed position, and a crochet hook 5 is arranged at the central position of the slide block 3. Slider 3 can reciprocate to slide in the fretwork position of threading apparatus main part 2, drives crochet hook 5 and stretches out or retract, and crochet hook 5 slides along with slider 3 and the translation goes out outside threading apparatus main part 2 for the threading. The handle 9 is arranged on the threader main body 2, the handle 9 is detachably connected with the threader main body 2, in the embodiment, the handle part of the handle 9 is a threaded rod, is screwed into the side wall of the threader main body 2 and is connected with the sliding block 3; the side wall of the threader main body 2 is provided with a sliding groove for accommodating the sliding of the handle 9. The handle 9 and the sewing machine needle are respectively positioned at two sides of the threading device main body 2.

The upper surface and the lower surface of the sliding block 3 are convex surfaces, the upper wall and the lower wall of the inner cavity of the threading apparatus main body 2 are concave surfaces, and the upper surface and the lower surface of the sliding block 3 are connected with the concave surfaces of the inner cavity of the threading apparatus main body 2 in a sliding manner. The upper part of the sliding block 3 is provided with a through small hole, the diameter is within the range of 3.0-4.0mm, and the value in the embodiment is 3.5 mm; the small hole is internally provided with a crochet hook 5, the diameter range of the crochet hook 5 is 0.2-0.4mm, and the value in the embodiment is 0.3 mm. At 3 tip installation springs 4 of slider, springs 4 are located the aperture below of

installation crochet hook

5, and 4 one ends of springs are pushed up tightly at 2 inner walls of threading apparatus main part, and the other end is contradicted with slider 3, and springs 4 are located advancing direction one side of slider 3, and when slider 3 drove crochet hook 5 and stretches out, springs 4 were compressed. In the embodiment, the wire diameter of the spring 4 is within the range of 0.4-0.8mm, the diameter of the spring 4 is within the range of 5-7mm, and the axial length is within the range of 8-12mm, wherein the wire diameter of the spring 4 is 0.6mm, the diameter of the spring 4 is 6mm, and the axial length is 10 mm. A detachable handle 9 is arranged outside the sliding block 3, the specification of the handle 9 is in the range of M3-M6, and M3 is selected in the embodiment; the length of the handle 9 is within the range of 12-20mm, and the value in the embodiment is 16 mm.

When the handle 9 pushes and drives the sliding block 3 and the crochet hook 5 to push out of the threading device main body 2, the spring 4 is compressed under the stress, and the crochet hook 5 passes through the needle eye 12 of the machine needle, so that the threading function of the industrial sewing machine is realized; when the pushing force to the handle 9 is removed, the spring 4 is reset to drive the sliding block 3 and the crochet hook 5 to retract into the threading device main body 2.

The end part of the threading apparatus is vertically provided with a U-shaped finger protector 6, the finger protector 6 is made into a metal frame by adopting iron wires and is made into a round-angle rectangular shape, the finger protector 6 is arranged vertical to the threading apparatus main body 2, and the initial position of the finger protector 6 is pointed to the sewing machine needle by the threading apparatus main body 2. When the sewing machine does not break, the finger is blocked by the U-shaped finger protector 6 on the threading device. So as to prevent the sewing machine worker from mistakenly placing the finger under the needle of the sewing machine during operation.

Example 2

An industrial sewing machine is applied with the threading device of the sewing machine in embodiment 1, wherein a triangular support is arranged at the turning part of a fixed seat 1 of the threading device of the sewing machine to be used as a ribbed plate so as to reduce the shaking caused by the rotation of a main body 2 of the threading device and enhance the stability of the threading device; as shown in fig. 4, the fixing plate of the fixing seat 1 is used as one end of the connection and is connected with the tail end of the presser bar 8 of the sewing machine.

When the sewing machine does not break the thread, the threading apparatus main body 2 is in an open state, namely the threading apparatus main body 2 is perpendicular to the connecting plate body of the fixed seat 1, and the finger is blocked by the U-shaped finger protector 6 on the threading apparatus. So as to prevent the sewing machine worker from mistakenly placing the finger under the needle of the sewing machine during operation. At this time, the threader body 2 plays a finger protection function.

When sewing machine broken string, promote the outer handle 9 of slider 3 for 1 slide bearing formula revolute pair of Z type fixing base rotates, and 1 middle section magnet 11 of fixing base adsorbs threading apparatus main part 2, and threading apparatus main part 2 is closed state this time, just so attaches on the face that has magnet 11 in fixing base 1. At this time, the handle 9 is pushed again to move the slider 3 rightward and compress the spring 4, and the crochet hook 5 connected to the slider 3 is extended to hook the sewing thread passing through the eye 12 of the machine needle. After the threading of the crochet hook 5 is finished, the crochet hook 5 and the sliding block 3 are reset leftwards due to the recovery function of the elastic deformation of the spring 4. At this time, the threader body 2 plays a role of safety threading.

After threading, the threading device is pulled away through the handle 9, the threading device is in an inoperative state, and the first function, namely the finger protection function, is recovered.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A threader of a sewing machine comprises a fixed seat (1), and is characterized in that a threader main body (2) is rotatably connected to the fixed seat (1), an included angle is formed between the initial position of the threader main body (2) and the fixed seat (1), and a space formed by the included angle is used for accommodating a needle of the sewing machine; the threading device main body (2) and the fixed seat (1) are magnetically adsorbed to realize limiting; the threader main body (2) is provided with a movably telescopic crochet hook (5) for threading;

one side of the threading apparatus main body (2) deviating from the fixing seat (1) is connected with a finger protector (6), the finger protector (6) is perpendicular to the threading apparatus main body (2) and the initial position of the finger protector (6) is pointed to the sewing machine needle by the threading apparatus main body (2).

2. The threader of a sewing machine according to claim 1, characterized in that the threader body (2) is hollow inside, a slide block (3) is slidably arranged at the hollow position, and the crochet hook (5) is connected with the slide block (3).

3. The threader of the sewing machine according to claim 2, characterized in that a handle (9) is detachably connected to the slider (3), and the handle (9) penetrates through the side wall of the threader body (2) and is respectively positioned at two sides of the threader body (2) together with the sewing machine needle.

4. A threader for a sewing machine according to claim 3 characterised in that the handle (9) is threadedly engaged with the slider (3).

5. The threader of the sewing machine according to claim 2, characterized in that a spring (4) is further arranged in the hollow inner cavity of the threader main body (2), two ends of the spring (4) respectively abut against the slider (3) and the inner wall of the threader main body (2), and the spring (4) is positioned on one side of the slider (3) in the advancing direction.

6. The threader of the sewing machine according to claim 1, characterized in that the fixing base (1) and the threader body (2) are perpendicular to each other in an initial state, and a magnet (11) for adsorbing the threader body (2) is arranged on one side of the fixing base (1) facing the threader body (2).

7. The threader of the sewing machine according to claim 6, characterized in that the magnet (11) is arranged in the middle of the fixing base (1) or on the side of the fixing base (1) facing away from the threader body (2).

8. The threader of the sewing machine according to claim 1, characterized in that a revolute pair is connected between the threader body (2) and the fixed seat (1), and the revolute pair comprises a connecting piece penetrating through the threader body (2) and the fixed seat (1) and a fastening piece fastened at the end of the connecting piece.

9. An industrial sewing machine comprising a presser bar (8), characterized in that the end of the presser bar (8) is detachably connected with the sewing machine threader according to any one of claims 1 to 8.