阅读说明：本技术 一种用于包缝机的收线机构及包缝机 (Take-up mechanism for overedger and overedger ) 是由 宋国庆 徐永明 芈韶雷 赵林蔚 于 2019-11-29 设计创作，主要内容包括：本发明提供一种收线机构及包缝机,收线机构包括机针和下弯针,下弯针具有收线部、设在收线部上的收线面、以及位于收线面端部的收线根部；在收线过程中,机针向上运动,下弯针向靠近机针的方向摆动,收线部勾住机针的线环,机针线在收线面上相对地向靠近收线根部的方向滑移,下弯针具有收线部刚勾住线环时的初始收线点、以及收线结束时的停止收线点；下弯针在停止收线点时,收线根部与机针之间在主轴轴向上的距离L为-2.5mm～2.5mm,使得在收线结束的最后避免收线根部拉扯机针线、或减少收线根部拉扯机针线的收线量,避免收线过程中出现急剧增加的突变收线量,实现机针线稳定、完美的收线,可以较好地实现薄料到厚料的适应性缝纫。(The invention provides a take-up mechanism and a overedger, wherein the take-up mechanism comprises a machine needle and a lower curved needle, the lower curved needle is provided with a take-up part, a take-up surface arranged on the take-up part and a take-up root positioned at the end part of the take-up surface; in the process of taking up, the machine needle moves upwards, the lower curved needle swings towards the direction close to the machine needle, the take-up part hooks the wire loop of the machine needle, the machine needle wire slides towards the direction close to the take-up root relatively on the take-up surface, and the lower curved needle is provided with an initial take-up point when the take-up part just hooks the wire loop and a stop take-up point when the take-up is finished; when the lower curved needle stops taking up the thread, the distance L between the take-up root and the machine needle in the axial direction of the main shaft is-2.5 mm, so that the pulling of the machine needle thread at the take-up root is avoided or the take-up amount of the machine needle thread at the take-up root is reduced at the end of taking up the thread, the sudden change take-up amount which is increased sharply in the take-up process is avoided, the stable and perfect take-up of the machine needle thread is realized, and the adaptive sewing from thin to thick materials can be better realized.)

1. A take-up mechanism for a overedger comprises a needle (1) capable of reciprocating up and down and a lower curved needle (2) capable of swinging back and forth in a direction close to or far away from the needle (1), wherein the lower curved needle (2) is provided with a take-up part (21), a take-up surface (22) arranged on the take-up part (21) and a take-up root part (23) positioned at the end part of the take-up surface (22); in the process of winding, eedle (1) upward movement, looper (2) are swung to the direction that is close to eedle (1) down, receive line portion (21) and hook the wire loop of eedle (1), and the eedle line of wearing to establish in eedle (1) is in receive line face (22) and relatively slide to the direction that is close to receipts line root (23), looper (2) have receive line portion (21) initial receipts line point when just hooking the wire loop and receive line the stopping point of receiving when finishing, its characterized in that: when the lower curved needle (2) stops taking up the thread, the distance L between the take-up root (23) of the lower curved needle (2) and the needle (1) in the axial direction of the main shaft (3) is-2.5 mm.

2. The take-up mechanism for an overlock machine as claimed in claim 1, wherein: when the lower curved needle (2) stops taking up the line point, the distance L between the take-up root (23) and the needle (1) in the axial direction of the main shaft (3) is 0-2.5 mm.

3. The take-up mechanism for the overedger according to claim 1, characterized in that an included angle α between the upper take-up surface (22) of the lower looper (2) and the needle (1) is 61-64 degrees when the lower looper (2) is at an initial take-up point, and an included angle α between the upper take-up surface (22) of the lower looper (2) and the needle (1) is 82-85 degrees when the lower looper (2) stops at a take-up point.

4. The take-up mechanism for the overedger according to claim 3, characterized in that the angle α between the upper take-up surface (22) of the lower looper (2) and the needle (1) is 63 ° when the lower looper (2) is at the initial take-up point, and the angle α between the upper take-up surface (22) of the lower looper (2) and the needle (1) is 84 ° when the lower looper (2) stops at the take-up point.

5. The take-up mechanism for an overlock machine as claimed in claim 1, wherein: the needle (1) is provided with a thread ring groove (11); in the process of taking up, the wire collecting part (21) on the lower curved needle (2) scratches and hooks the wire ring of the needle (1) from the wire ring groove (11) on the needle (1).

6. An overlock machine, characterized in that: the overedger is provided with the take-up mechanism of any one of claims 1 to 5.

Technical Field

The invention relates to a take-up mechanism for an overlock machine.

The invention also relates to an overedger comprising the take-up mechanism.

Background

At present, a overedger is provided with a needle capable of reciprocating up and down, a lower curved needle capable of reciprocating left and right, and an upper curved needle arranged on one side of the needle, such as a hemming actuator of the overedger disclosed in chinese patent application publication No. CN 101338494A. During the operation of the overedger, when the needle moves upwards, the lower curved needle swings rightwards in the direction close to the needle, the lower curved needle hooks the wire loop of the needle until the lower curved needle swings to the rightmost end of the movement stroke of the lower curved needle, so that the process is the take-up process of the overedger, and the lower curved needle is matched with the needle and then combined with the take-up lever matched with the needle to realize the take-up of the needle thread. Therefore, the machine needle, the lower curved needle, the take-up lever and other components also form the take-up mechanism of the overedger.

However, due to the matching structural features between the sewing needle and the lower curved needle in the existing overlock sewing machine and the structural features of the lower curved needle, the winding amount of the overlock sewing machine in the winding process presents a change track of a parabola, namely, a sudden change state of a sharp increase of the winding amount exists, and the sudden change of the sharp increase of the winding amount is usually caused by that the winding root on the lower curved needle excessively pulls the sewing needle, so that the stable winding cannot be performed. Therefore, when the overedger sews fabrics with different thicknesses, even if the matching of the take-up lever and the lower looper is adjusted, the sewing quality with wide adaptability cannot be realized, the thread tension of the machine needle thread and the looper thread needs to be respectively adjusted by the thread clamping device aiming at the fabrics with different thicknesses in the sewing process, so that the sewing quality requirement is met, but certain technical requirements are met for sewing operators, and the sewing quality requirement is difficult to realize. Generally, when a thin material is sewn, the fabric is wrinkled due to overlarge take-up amount, when a thick material is sewn, the take-up amount is insufficient, so that the take-up of the fabric is unstable, and further, the perfect take-up of machine needle threads and the adaptive sewing of the thin and thick materials cannot be realized.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a take-up mechanism capable of achieving stable take-up.

In order to achieve the purpose, the invention provides a take-up mechanism for an overlock machine, which comprises a needle capable of reciprocating up and down and a lower curved needle capable of reciprocating and swinging towards the direction close to or away from the needle, wherein the lower curved needle is provided with a take-up part, a take-up surface arranged on the take-up part and a take-up root part positioned at the end part of the take-up surface; in the process of winding, the needle moves upwards, the lower curved needle swings towards the direction close to the needle, the winding part hooks the wire loop of the needle, the needle wire penetrating the needle slides on the winding surface relatively towards the direction close to the winding root, and the lower curved needle is provided with an initial winding point when the winding part just hooks the wire loop and a stopping winding point when winding is finished; and when the lower curved needle stops at a take-up point, the distance L between the take-up root of the lower curved needle and the needle in the axial direction of the main shaft is-2.5 mm.

Further, when the lower curved needle stops at a take-up point, the distance L between the take-up root of the lower curved needle and the needle in the axial direction of the main shaft is 0-2.5 mm.

Further, when the lower curved needle is at an initial take-up point, an included angle α between an upper take-up surface of the lower curved needle and the needle is 61-64 degrees, and when the lower curved needle is at a take-up stopping point, an included angle α between an upper take-up surface of the lower curved needle and the needle is 82-85 degrees.

Furthermore, when the lower curved needle is at an initial take-up point, an included angle α between the upper take-up surface of the lower curved needle and the needle is 63 degrees, and when the lower curved needle stops the take-up point, an included angle α between the upper take-up surface of the lower curved needle and the needle is 84 degrees.

Furthermore, a wire ring groove is formed on the machine needle; in the process of taking up, the take-up part on the lower curved needle scratches and hooks the thread ring of the needle from the thread ring groove on the needle.

As mentioned above, the take-up mechanism and the overedger provided by the invention have the following beneficial effects:

according to the method, the horizontal distance L between the take-up root and the machine needle when the take-up point of the lower curved needle is stopped is controlled within the range of minus 2.5mm to 2.5mm, so that the machine needle thread is prevented from being pulled by the take-up root at the end of take-up, or the take-up amount of the machine needle thread is reduced at the take-up root, the machine needle thread is prevented from being excessively and rapidly pulled by the take-up root, the sudden change take-up amount which is rapidly increased in the take-up process is avoided, stable and perfect take-up of the machine needle thread is realized, the adaptive sewing from thin materials to thick materials can be well realized, and the sewing performance of the whole overlock sewing machine is greatly improved.

Drawings

FIG. 1 is a schematic structural view of an overlock machine according to the present application.

Fig. 2 is a schematic structural view of a needle in the present application.

Fig. 3 is a schematic structural diagram of a down-bending needle in the present application.

FIG. 4 is a schematic view of the needle and looper of the present application engaged at an initial thread take-up point.

FIG. 5 is a schematic view of the needle and the looper of the present application engaged at the point of stopping the thread take-up.

Description of the element reference numerals

1 machine needle

11 wire ring groove

2 lower bend needle

21 wire take-up part

22 line-collecting surface

23 take-up root

3 spindle

4 needle bar

5 curved needle shaft

6 curved needle seat

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

The present application provides an overlock machine, as shown in fig. 1, in which a main shaft 3 which can rotate and extend right and left, a needle bar 4 which can reciprocate up and down, a needle 1 which is mounted at the lower end of the needle bar 4, a needle bar driving mechanism which is connected between the main shaft 3 and the needle bar 4, a lower looper 2 which can swing right and left in a direction approaching or separating from the needle 1, and a looper driving mechanism which is connected between the main shaft 3 and the lower looper 2 are mounted. The looper driving mechanism mainly comprises a looper shaft 5, a looper seat 6 and a swing transmission assembly, wherein the looper shaft 5 and the looper seat 6 are rotatably arranged in a shell of the overedger, the swing transmission assembly is connected between the looper shaft 5 and a main shaft 3, the looper shaft 5 extends forwards and backwards and is perpendicular to the main shaft 3, the looper shaft 5 is positioned below the main shaft 3, the lower end of the looper seat 6 is fixed on the looper shaft 5 through a screw, and the lower end of the lower looper 2 is fixed on the looper seat 6 through a screw. When the overedger sews, the main shaft 3 rotates, the main shaft 3 drives the needle bar 4 to reciprocate up and down through the needle bar driving mechanism, and the needle bar 4 drives the needle 1 to reciprocate up and down together; meanwhile, the main shaft 3 drives the bent needle shaft 5 to reciprocate left and right around the axis of the bent needle shaft through the swinging transmission component, and the bent needle shaft 5 drives the bent needle seat 6 to reciprocate left and right together with the lower bent needle 2.

Further, the application also provides a take-up mechanism for the overedger, which comprises the machine needle 1 and the lower bending needle 2 as shown in fig. 1. As shown in fig. 2, the needle 1 is provided with a thread loop groove 11, and the thread loop groove 11 is opened on the rear surface of the needle 1; as shown in fig. 2, the lower looper 2 has a thread take-up portion 21, a thread take-up surface 22 provided on the thread take-up portion 21, and a thread take-up root portion 23 located at the left end of the thread take-up surface 22, the thread take-up surface 22 is an inclined surface, the right end is inclined upward to the right, and the thread take-up root portion 23 is an arc segment. When the overlock sewing machine is used for sewing, the needle 1 reciprocates up and down, and the lower curved needle 2 swings back and forth left and right, so that the needle 1 has an upper needle stop position at the uppermost end in the stroke range and a lower needle stop position at the lowermost end in the stroke range, and the lower curved needle 2 has a left limit position at the leftmost end in the stroke range and a right limit position at the rightmost end in the stroke range; the matching relationship between the machine needle 1 and the lower bent needle 2 is as follows: when the needle 1 is at the upper needle stop position, the lower bent needle 2 is limited at the right pole; when the needle 1 moves downwards from the upper needle stop position to the lower needle stop position, the lower bent needle 2 swings leftwards from the right limit position to the left limit position in the direction far away from the needle 1; when the machine needle 1 is at the lower needle stop position, the lower bent needle 2 is at the left limit position; when the needle 1 moves upwards from the lower needle stop position to the upper needle stop position, the lower curved needle 2 swings rightwards from the left limit position to the direction close to the needle 1 to the right limit position.

Further, in the process that the machine needle 1 moves upwards and the lower curved needle 2 swings right, the wire collecting part 21 on the lower curved needle 2 passes through the wire ring groove 11 on the machine needle 1 and hooks the wire ring of the machine needle 1, the lower curved needle 2 drives the wire ring to swing rightwards together, the machine needle wire penetrating through the machine needle 1 slides on the wire collecting surface 22 of the lower curved needle 2 in the direction close to the wire collecting root 23 relatively, the lower curved needle 2 and the machine needle 1 are matched to realize the wire collecting of the machine needle wire, therefore, the wire collecting mechanism also executes the wire collecting action in the process that the machine needle 1 moves upwards and the lower curved needle 2 swings right to generate the wire collecting process, when the wire collecting part 21 just hooks the wire ring of the machine needle 1, the wire collecting process starts, when the wire collecting part 21 drives the wire ring of the machine needle 1 to move rightwards to the right limit position of the lower curved needle 2, the wire collecting process is finished, therefore, in the wire collecting process, the lower curved needle 2 has an initial wire collecting point and a stopping point, an included angle between the wire collecting surface 22 on the lower curved needle 2 and the machine needle 1 and the main shaft 2 changes at the moment α, and the distance between the main shaft 1 and the main shaft of the main shaft.

Specifically, when the lower looper 2 stops the thread take-up point, as shown in fig. 5, a distance L in the axial direction of the main shaft 3 between the thread take-up root 23 of the lower looper 2 and the needle 1 is-2.5 mm to 2.5mm, and the distance L is also a horizontal distance in the left-right direction between the right end of the thread take-up root 23 of the lower looper 2 connected to the thread take-up surface 22 and the needle 1. When there are a plurality of needles 1, the plurality of needles 1 are arranged side by side left and right along the axial direction of the main shaft 3, and the distance L is a horizontal distance between the take-up root 23 on the lower curved needle 2 and the leftmost needle 1 in the left-right direction. When the distance L is a certain negative number in the range of minus 2.5mm to 0, the fact that the right end of the take-up root 23 on the lower curved needle 2 passes over the machine needle 1 rightwards when the lower curved needle 2 stops taking up the thread is indicated, at the end of the take-up process, the take-up root 23 on the lower curved needle 2 pulls the machine needle thread to generate a take-up amount, and the take-up root 23 plays a certain take-up role, but the take-up amount of the take-up root 23 to the machine needle thread is very small due to the fact that the distance L is minus 2.5mm to 0, the take-up amount cannot be increased sharply, and the change of the take-up amount in the take-up process is relatively gentle. When the distance L is a positive number within the range of 0-2.5 mm, it is indicated that when the lower curved needle 2 stops winding, the right end of the winding root 23 on the lower curved needle 2 does not pass over the needle 1 rightwards and is still located on the left side of the needle 1, at this time, the machine needle thread is still pulled by the winding surface 22 at the end of the winding process, and a winding amount is generated, or in the winding process, the thread is pulled only through the winding surface 22, the thread is not pulled through the winding root 23, the winding root 23 does not play a role of winding, the winding amount of the winding root 23 is 0, and therefore, the winding amount is changed linearly and no obvious mutation exists. Therefore, the horizontal distance L between the take-up root 23 and the machine needle 1 when the take-up point of the lower curved needle 2 is stopped is controlled within the range of minus 2.5mm to 2.5mm, so that the take-up root 23 is prevented from pulling the machine needle thread or the take-up amount of the take-up root 23 pulling the machine needle thread at the end of take-up is reduced, the take-up root 23 is prevented from excessively and sharply pulling the machine needle thread, sharply increased sudden take-up amount in the take-up process is avoided, stable and perfect take-up of the machine needle thread is realized, adaptive sewing from thin materials to thick materials can be well realized, and the sewing performance of the whole overlock sewing machine is greatly improved.

Preferably, when the lower looper 2 stops the thread take-up point, the distance L between the thread take-up root 23 of the lower looper 2 and the needle 1 in the axial direction of the main shaft 3 is 0-2.5 mm, and most preferably 0 mm. In addition, the take-up root 23 is a section of arc segment occupying 145-155 degrees and has a radius of 0.7-0.8 mm; most preferably, the take-up root 23 is a segment of a circular arc occupying 150 ° and having a radius of 0.75 mm.

Further, when the lower looper 2 is at an initial take-up point, as shown in fig. 4, a take-up portion 21 on the lower looper 2 just hooks a wire loop of a needle 1, at this time, an included angle α between a take-up surface 22 on the lower looper 2 and the needle 1 (the central axis of the needle 1) is 61-64 degrees, as the lower looper 2 continues to swing rightwards, an included angle α between the take-up surface 22 on the lower looper 2 and the needle 1 gradually increases, when the lower looper 2 stops at the take-up point, as shown in fig. 5, the take-up portion 21 on the lower looper 2 drives the wire loop of the needle 1 to move rightwards to a right limit position of the lower looper 2, at this time, an included angle α between the take-up surface 22 on the lower looper 2 and the needle 1 is 82-85 degrees, under the premise that a horizontal distance L between a take-up root 23 and the needle 1 when the take-up point of the lower looper 2 stops, the take-up surface 22 and the needle 1 is not present application, the relationship between the initial take-up point and the take-up surface is not changed between the initial take-up point and the take-up surface 23 and the lower looper 2, the take-up surface is kept in a linear adjustment of the linear take-up needle 2, the linear take-up surface, the linear take-up needle 2, the linear take-up needle is a linear take-up angle 3663 degree adjustment mechanism, the linear take-up angle between the lower looper 2 is a linear take-up surface is more stable adjustment angle is 3663 degree, the 3622-up needle is more excellent and the linear adjustment, the linear adjustment of the lower looper 2, the linear take-up needle is 3622-up needle 2, the linear adjustment mechanism, the linear adjustment of the linear adjustment mechanism, the linear adjustment of the take-up needle is more the take-up needle is 3623 is more the linear adjustment of the take.

In conclusion, the overedger related to the application can well realize adaptive sewing from thin materials (such as thin gauze fabrics) to thick materials (such as thick denim fabrics) and perfect quality sewing, and greatly improves the sewing performance of the whole overedger. In addition, the component composition structure of the overedger is not changed, so that the materials and the processing technology used in the production of the machine needle 1 and the lower curved needle 2 are basically the same before the machine needle is processed, and no extra cost is generated, so that the thin and thick adaptability and the sewing performance of the whole overedger can be greatly improved at very low cost. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.