CN116005372A - Clean and tidy seam lifting mechanism of sewing machine - Google Patents

Abstract

The invention discloses a clean and tidy seam lifting mechanism of a sewing machine, which comprises a small needle plate, a movable clamping knife, a second needle hole, a wire clamping plate and a fixed clamping knife, wherein a first needle hole for a needle to pass through is formed in the small needle plate; the clean seam lifting mechanism of the sewing machine can realize the seam lifting and falling-off preventing function or the bird nest preventing function, and completely solves the problem of clean seam lifting.

Description

Clean and tidy seam lifting mechanism of sewing machine

Technical Field

The invention relates to the technical field of pattern sewing machines, in particular to a clean and tidy seam lifting mechanism of a sewing machine.

Background

Currently, in the field of pattern sewing machines, the process of first needle sewing a sewing material by a sewing machine is called lift. Starting to start the seam as shown in fig. 7, if the seam is successfully started as shown in fig. 8; however, during the seam lifting process, the free thread end 80 is present at one end of the upper thread 8, and since the free thread end 80 has no tension control of the previous sewing stitch, the free thread end 80 can freely move, and there is a certain probability of seam lifting failure, and the seam lifting failure is shown in fig. 9 or fig. 10, specifically:

1. FIG. 9 is a first condition of a stitch failure, which easily occurs under the working conditions of too short upper thread 8, high elasticity of sewing material or too thick sewing material during the stitch pulling, that is, during the stitch pulling, the upper thread 8 on the needle 7 cannot hook the lower thread 90 of the shuttle bed 9, and the free thread end 80 is loosened, which easily causes that the following needles cannot be sewn to the upper thread, and seriously affects the sewing production work;

2. fig. 10 is a second case of a stitch failure, which easily occurs under the condition that the upper thread 8 is too long during the stitch starting, that is, during the stitch starting, the upper thread 8 on the needle 7 can hook the bottom thread 90 of the shuttle bed 9, but the free thread end 80 of the upper thread 8 can block the first needle hole 61 of the small needle plate 6, and the following several needles and the free thread end 80 are wound on the sewing position, so as to form a bird nest defect, which affects the beauty, requires the subsequent manual repair of the sewing personnel, and has complicated work.

Currently, there is no mechanical structure on the market capable of solving the two problems of seam lifting failure, and it is still necessary for the sewing personnel to avoid or repair the seam lifting failure by using the manual experience and feel.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a neat seam lifting mechanism of a sewing machine, which is used for solving the problem that free thread ends loose or bird nest-shaped defects are formed during seam lifting, so that the problem of neat seam lifting is completely solved.

In order to achieve the above purpose, the invention provides a clean and tidy seam lifting mechanism of a sewing machine, which comprises a small needle plate, wherein a first needle hole for a needle to pass through is formed in the small needle plate, the clean and tidy seam lifting mechanism further comprises a movable clamp knife rotatably arranged at the bottom of the small needle plate, a second needle hole is formed in the movable clamp knife, a thread clamping plate and a fixed clamp knife are respectively arranged on one side of the movable clamp knife, the thread clamping plate, the movable clamp knife and the fixed clamp knife are sequentially arranged in the vertical direction from top to bottom, the thread clamping plate is rotatably arranged at the bottom of the small needle plate, an elastic piece is arranged at one end of the thread clamping plate, the movable clamp knife is provided with a first position, a second position and a third position which are opposite to the small needle plate, a driving mechanism for driving the movable clamp knife to rotate to the first position, the second position and the third position is arranged at one end of the movable clamp knife, when the movable clamp knife is positioned at the first position and the sewing machine is lifted, the second needle hole and the first needle hole is coaxially arranged with the first needle hole, the second needle hole is used for the needle feeding the needle is used for a needle to pass through, and the thread clamping head is clamped at the top of the movable clamp knife and the top of the movable clamp knife is clamped at the bottom synchronously with the third position and the thread clamping head is clamped at the bottom of the movable clamp position.

Preferably, the elastic member is a return spring; when the movable clamping knife is positioned at the second position or the third position, the reset springs are used for providing elastic tension for the wire clamping plate, so that the wire clamping plate and the movable clamping knife clamp the free thread end of the upper thread together, and when the movable clamping knife is positioned at the first position, the reset springs are used for resetting the wire clamping plate; the reset spring effectively ensures the stability of the actions.

Preferably, the bottom of the small needle plate is provided with a mounting block, one end of the return spring is arranged at one end of the wire clamping plate, and the other end of the return spring is arranged on the mounting block.

Preferably, the clamp plate is provided with a supporting part protruding downwards; when the movable clamp knife is positioned at the second position, the propping part is used for clamping the free thread end of the upper thread at the top of the movable clamp knife.

Preferably, one end of the fixed clamp knife is provided with a blade part; when the movable clamp knife is positioned at the third position and the seam is formed, the top edge of the cutting edge part of the fixed clamp knife is used for cutting off the free thread end of the upper thread at the second needle hole of the movable clamp knife.

Preferably, the fixed clamping knife is arranged at the bottom of the small needle plate through bolts.

Preferably, the driving mechanism comprises a motor, a driving block sleeved on a rotating shaft of the motor, a position detection sheet arranged on the driving block, a pull rod arranged on the position detection sheet and a position sensor arranged on one side of the position detection sheet and matched with the position detection sheet, and one end of the pull rod is arranged at one end of the movable clamping knife; the motor, the driving block, the position detection sheet, the pull rod and the position sensor are matched with an electric control system in the prior art, so that the driving mechanism can accurately drive the movable clamping knife to rotate to a first position, a second position and a third position.

Preferably, the pull rod is arranged in a broken line shape; the pull rod is convenient to install and arrange.

Preferably, the small needle plate is embedded with a needle plate, and the first needle hole is formed in the needle plate.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention is provided with the wire clamping plate, the movable cutter and the fixed clamp cutter which are arranged from top to bottom, has simple installation and small occupied space, and is beneficial to the space layout of the sewing machine.

2. The clamp plate, the movable cutter, the driving mechanism and the fixed clamp cutter are matched with the sewing machine structure and an electric control system in the prior art, and the sewing machine can be specifically realized: when the seam is formed and the movable clamping knife is positioned at the first position, the machine needle falls through the second needle hole; then, when the needle is lifted to the small needle plate, the movable clamping knife can rotate the free thread end of the upper thread to the second position and prop against the clamping plate no matter the free thread end of the upper thread of the small needle plate is in a quick release state or a nest state, and the clamping plate is kept at the original position under the elastic action of the elastic piece and is matched with the movable clamping knifeTogether withThe free thread end of the upper thread is clamped, the upper thread of the machine needle is controlled by the tension of the free thread end of the upper thread, and the next sewing can be successfully performed to form a sewing stitch, namely the sewing is successful; after successful seam starting, the movable clamping knife synchronously pushes the wire clamping plate to rotateAnd the third position is that the wire clamping plate is acted by the elastic piece and continuously clamps the free wire end of the upper wire together with the movable clamping knife, and simultaneously the movable clamping knife and the fixed clamping knife jointly cut off the free wire end of the upper wire.

3. The invention provides a clean and tidy seam lifting mechanism of a sewing machine, which has the advantages of simple installation in the first aspectAssembly ofThe space is compact, and the size miniaturization of the sewing machine is realized after the sewing machine is installed; in the second aspect, the seam-starting anti-falling function or the bird nest preventing function can be realized, and the two functions are stable and effective; in the third aspect, the clean and tidy seam lifting mechanism reduces the repair rate of a customer sewing product, saves labor cost and manufacturing cost, and improves the quality of sewing stitches; in the fourth aspect, the sewing machine is matched with the structure of the sewing machine and an electric control system in the prior art to realize full-automatic production, is suitable for being used by sewing novice, and completely solves the problem of clean and tidy seam lifting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a clean and tidy seam lifting mechanism of a sewing machine;

FIG. 2 is a schematic view showing an exploded structure of a clean and tidy seam lifting mechanism of a sewing machine according to the present invention;

FIG. 3 is a top view of a clean and tidy lift mechanism of the sewing machine provided by the present invention;

FIG. 4 is a top view of the movable clamp provided by the present invention when in a first position;

FIG. 5 is a top view of the movable clamp knife provided by the present invention when in a second position;

FIG. 6 is a top view of the movable clamp knife in a third position provided by the present invention;

FIG. 7 is a front view of a prior art sewing machine with a needle beginning to lift;

FIG. 8 is a front view of a sewing machine provided in the prior art with successful needle lift;

FIG. 9 is a front view of a first case of needle lift failure of the sewing machine provided by the prior art;

fig. 10 is a front view showing a second case of a needle lift failure of the sewing machine provided in the prior art.

The drawings include:

1. a movable clamping knife; 10. a second pinhole; 2. a wire clamping plate; 20. a supporting part; 3. fixing the clamping knife; 30. a blade section; 4. an elastic member; 40. a mounting block; 5. a driving mechanism; 50. a motor; 51. a driving block; 52. a position detecting sheet; 53. a pull rod; 54. a position sensor; 6. a small needle plate; 60. a needle hole plate; 61. a first pinhole; 7. a needle; 8. an upper thread; 80. free thread ends; 9. a shuttle bed; 90. and (5) a bottom line.

Detailed Description

The technical solutions of the present embodiment of the present invention will be clearly and completely described below with reference to the drawings in the present embodiment of the present invention, and it is apparent that the described present embodiment is one embodiment of the present invention, but not all the present embodiments. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

Referring to fig. 1 to 6, an embodiment of the present invention provides a clean and tidy seam lifting mechanism of a sewing machine, which includes a small needle plate 6, wherein the small needle plate 6 is used for placing sewing materials, a first needle hole 61 for passing through a needle 7 is formed on the small needle plate 6, a needle hole plate 60 is embedded on the small needle plate 6, and the first needle hole 61 is formed on the needle hole plate 60. The movable clamp knife 1 is rotatably arranged at the bottom of the small needle plate 6, a second needle hole 10 is formed in the movable clamp knife 1, a wire clamping plate 2 and a fixed clamp knife 3 are respectively arranged on one side of the movable clamp knife 1, the wire clamping plate 2, the movable clamp knife 1 and the fixed clamp knife 3 are sequentially arranged from top to bottom in the vertical direction, the wire clamping plate 2 is rotatably arranged at the bottom of the small needle plate 6, an elastic piece 4 is arranged at one end of the wire clamping plate 2, the movable clamp knife 1 is provided with a first position, a second position and a third position which rotate relative to the small needle plate 6, a driving mechanism 5 for driving the movable clamp knife 1 to rotate to the first position, the second position and the third position is arranged at one end of the movable clamp knife 1, wherein when the movable clamp knife 1 is positioned at the first position and a sewing machine is in a seam, the second needle hole 10 is coaxial with the first needle hole 61, the second needle hole 10 is used for allowing a needle thread 8 of the machine needle 7 to pass through, when the movable clamp knife 1 is positioned at the second position, the top of the movable clamp knife 1 is in the same with the bottom of the wire clamping plate 2 and pushes the free clamp head 8 of the machine needle 7 against the bottom of the wire clamping plate 2 to the first position and the free clamp knife 80 is clamped at the third position, and after the movable clamp knife 1 is clamped to the free clamp knife 1 is clamped to the first position and the third position is clamped to the thread clamp needle thread 8 is clamped to the free to the top 80, and the needle thread clamp needle 7 is cut off the thread 1 is synchronously.

The elastic member 4 is a return spring. The specific function of the return spring is as follows: first point: when the movable cutter is positioned at the first position or rotates to the first position, the return spring enables the clamp plate 2 to be kept in place or reset; second aspect: when the movable cutter rotates to the second position, the reset spring provides a certain elastic tension for keeping the clamp plate 2 in place, so that the bottom of the clamp plate 2 is propped against the movable clamp cutter 1, and a clamping force is generated between the clamp plate 2 and the movable clamp cutter 1 to clamp the free thread end 80 of the upper thread 8 between the clamp plate 2 and the movable clamp cutter 1; third aspect: when the movable cutter rotates to the third position and the seam is formed, the movable cutter synchronously pushes the clamp plate 2 to rotate to the third position, the elastic tension provided by the spring is increased, so that the clamp plate 2 and the movable clamp knife 1 clamp the free thread end 80 of the upper thread 8 more conveniently and more reliably, and the free thread end 80 of the upper thread 8 is cut off at the bottom of the movable clamp knife 1 and the top of the fixed clamp knife 3. Therefore, the use of the return spring has an advantage of effectively ensuring the stable progress of the above-described actions, and ensuring the effective implementation of the functions of the clamp plate 2, the movable clamp 1 and the fixed clamp 3.

The mounting block 40 is arranged at the bottom of the small needle plate 6, one end of the tension spring is arranged at one end of the wire clamping plate 2, and the other end of the tension spring is arranged on the mounting block 40.

The clamp 2 has a downwardly projecting abutment 20. The abutting part 20 acts: the abutment 20 is used to clamp the free thread end 80 of the upper thread 8 on top of the movable clamp 1 when the movable clamp 1 is in the second position or the third position. The supporting part 20 has the advantages that: when the movable clamping knife 1 is located at the second position or the third position, the friction force between the supporting part 20 and the top of the movable clamping knife 1 can be increased, and the functions of the wire clamping plate 2, the movable clamping knife 1 and the fixed clamping knife 3 are effectively implemented.

The fixed blade 3 has a blade portion 30 at one end. The blade portion 30 functions to: when the movable clamp knife 1 is positioned at the third position and the seam is completed, the top edge of the cutting edge part 30 of the fixed clamp knife 3 is used for cutting the free thread end 80 of the upper thread 8 at the second needle hole 10 of the movable clamp knife 1.

The fixed clamping knife 3 is arranged at the bottom of the small needle plate 6 through bolts. The movable clamping knife 1 is arranged at the bottom of the small needle plate 6 through a section screw, and the section screw is arranged in two sections, wherein one section of the section screw is provided with external threads for being in threaded connection with the bottom of the small needle plate 6, and the other section of screw is provided with a polish rod for the movable clamping knife 1 to rotate. The clamp plate 2 is arranged at the bottom of the small needle plate 6 through a section screw, and the section screw is arranged in two sections, wherein one section of the section screw is provided with external threads for being in threaded connection with the bottom of the small needle plate 6, and the other section of screw is provided with a polish rod for the clamp plate 2 to rotate.

The driving mechanism 5 comprises a motor 50, a driving block 51 sleeved on a rotating shaft of the motor 50, a position detecting piece 52 arranged on the driving block 51, a pull rod 53 arranged on the position detecting piece 52, and a position sensor 54 arranged on one side of the position detecting piece 52 and matched with the position detecting piece 52, wherein one end of the pull rod 53 is arranged at one end of the movable clamp knife 1. The motor 50 and the position sensor 54 of the driving mechanism 5 are used with an electric control system in the prior art, and different position parameters of the position detecting piece 52 and the position sensor 54 can be determined by setting different rotation angles of the position detecting piece 52, so that the rotation amount of the movable clamp knife 1 to the first position, the second position and the third position can be accurately controlled. The motor 50, the driving block 51, the position detecting piece 52, the pull rod 53 and the position sensor 54 of the driving mechanism 5 work together to precisely drive the movable clamp knife 1 to rotate to the first position, the second position and the third position.

The pull rod 53 is arranged in a fold line shape, which is beneficial to the installation of the pull rod 53 on the sewing machine and the installation layout of the sewing machine.

Referring to fig. 4 to 6, an embodiment of the present invention provides a working principle of a clean and tidy seam lifting mechanism of a sewing machine:

first, as shown in fig. 4, fig. 4 shows the movable clamp knife 1 in a first position, and when the sewing machine is started, the upper thread 8 of the needle 7 passes through the first needle hole 61 and the second needle hole 10, respectively;

then, when the upper thread 8 of the standby needle 7 intersects with the lower thread 90 of the shuttle 9 and the needle 7 returns to the top of the small needle plate 6, at this time, the driving mechanism 5 drives the movable clamp 1 to rotate from the first position to the second position, and at this time, whether the free thread end 80 of the upper thread 8 of the small needle plate 6 is in a fast release state or a nest-like state, the movable cutter drives the free thread end 80 of the upper thread 8 to come to the second position, as shown in fig. 5, fig. 5 shows that the movable clamp 1 is in the second position, the clamp 2 is kept in place by the elastic member 4, and at the same time, the elastic member 4 provides a certain elastic force, so that the free thread end 80 of the upper thread 8 between the clamp 2 and the movable cutter is clamped;

then, the cloth feeding teeth on the small needle plate 6 push the sewing material forward, and the cloth feeding teeth are of the existing structure, so that details are omitted, at this time, the upper thread 8 of the needle 7 reaches the second sewing point and passes through the first needle hole 61, and then, as the upper thread 8 of the needle 7 is subject to the tension of the sewing track of the free thread end 80 of the upper thread 8, the upper thread 8 of the needle 7 is successfully hooked by the shuttle bed 9 and intersected with the bottom thread 90, and the track is successfully sewn;

then, after the seam is formed, as shown in fig. 6, fig. 6 shows that the movable clamping knife 1 is located at the third position, the movable clamping knife 1 synchronously pushes the wire clamping plate 2 to rotate to the third position, the elastic piece 4 increases the elastic force, the free thread end 80 of the upper thread 8 is clamped more tightly, and at this time, the movable clamping knife 1 and the fixed clamping knife 3 jointly cut off the free thread end 80 of the upper thread 8;

after the whole sewing work is finished, the driving mechanism 5 drives the movable clamp knife 1 to reset from the third position to the first position, and the clamp plate 2 is reset under the action of the elastic piece 4.

In the working principle of the clean sewing mechanism of the sewing machine, the sewing end can be set after the second needle or the second needle is sewn, and the parameter judgment of the sewing end mark is set by a producer or a user, so that the parameter free setting has the advantage of being convenient for the producer or the user to set according to the sewing conditions of different sewing materials, and is used for avoiding the conditions that the second needle is sewn successfully and the third needle drags the stitches of the two previous needles due to the dragging of the needle 7.

The neat seam lifting mechanism of the sewing machine can realize the seam lifting and falling-off prevention function or the bird nest prevention function, can also play a role in enhancing the sewing quality during normal seam lifting, can effectively solve the problem of neat seam lifting, avoids various unstable problems during seam lifting, and is friendly to new sewing.

The foregoing is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.

Claims (9)

1. The utility model provides a neatly take-up mechanism of sewing machine, includes small needle board (6), set up on small needle board (6) and be used for supplying first pinhole (61) that needle (7) passed, its characterized in that still includes movable clamp knife (1) of rotatably installing in small needle board (6) bottom, set up second pinhole (10) on movable clamp knife (1), clamp plate (2) and fixed clamp knife (3) are installed respectively to movable clamp knife (1) one side, clamp plate (2), movable clamp knife (1) and fixed clamp knife (3) set gradually from top to bottom in vertical direction, clamp plate (2) rotatably install in small needle board (6) bottom, clamp plate (2) one end is installed elastic component (4), movable clamp knife (1) have first position, second position and the third position of rotation relative to small needle board (6), movable clamp knife (1) one end is installed and is used for driving movable clamp knife (1) to rotate to first position, second position and third position, wherein when needle plate (1) and fixed clamp knife (3) are located first pinhole (5), when needle (1) are located in the second needle hole (8) are located in the coaxial setting up, needle (1) and needle (10), the top of the movable clamp knife (1) is propped against the bottom of the clamp plate (2) and clamps the free thread end (80) of the upper thread (8) of the needle (7), when the movable clamp knife (1) is positioned at a third position and after the seam is formed, the movable clamp knife (1) synchronously pushes the clamp plate (2) to rotate to the third position, and the bottom of the movable clamp knife (1) and the top of the fixed clamp knife (3) are sheared so that the free thread end (80) of the upper thread (8) is cut off.

2. A neatly lifting mechanism of a sewing machine according to claim 1, characterized in that the elastic member (4) is a return spring.

3. The clean and tidy seam lifting mechanism of a sewing machine according to claim 2, wherein the mounting block (40) is installed at the bottom of the small needle plate (6), one end of the return spring is installed at one end of the wire clamping plate (2), and the other end is installed on the mounting block (40).

4. A neatly lifting mechanism of a sewing machine according to claim 1, characterized in that the clamp (2) has a downwardly projecting abutment (20).

5. A neatly lifting mechanism of a sewing machine according to claim 1, characterized in that the stationary knife (3) has a blade portion (30) at one end.

6. The trimming and hemming mechanism of a sewing machine according to claim 1 or 5, wherein the stationary clamp knife (3) is mounted to the bottom of the small needle plate (6) by means of a bolt.

7. The clean and tidy seam lifting mechanism of a sewing machine according to claim 1, wherein the driving mechanism (5) comprises a motor (50), a driving block (51) sleeved on a rotating shaft of the motor (50), a position detection sheet (52) arranged on the driving block (51), a pull rod (53) arranged on the position detection sheet (52) and a position sensor (54) arranged on one side of the position detection sheet (52) and matched with the position detection sheet (52), and one end of the pull rod (53) is arranged at one end of the movable clamp knife (1).

8. A neatly lifting mechanism of a sewing machine according to claim 7, characterized in that the pull rod (53) is provided in a fold line shape.

9. The clean and tidy seam taking-up mechanism of a sewing machine according to claim 1, wherein the small needle plate (6) is embedded with a needle plate (60), and the first needle hole (61) is opened on the needle plate (60).

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