A machine for sewing and automatic hemming

Abstract

The utility model discloses a kind of binding machine and automatic lower swing machine, it is related to sewing machine technical field, binding machine includes needle bar, needle, first stop block and second stop block, needle bar can move in up-down direction;Needle is fixedly connected to needle bar;First stop block is fixedly connected to needle bar;Second stop block is below first stop block, second stop block is connected to first stop block by drive assembly, drive assembly is used to drive second stop block to press down cloth before needle moves down and pierces into cloth, and after needle moves up and leaves cloth, drive second stop block to move up and leave cloth. Second stop block not only can press cloth when needle sewing, but also can leave cloth after needle leaves, avoid the problem that over-ramming becomes dense caused by presser foot pushing material, simultaneously, only through auxiliary feeding mechanism to feed, there is no problem of matching between auxiliary feeding mechanism and the feeding function of sewing unit, can avoid that both are not matched well and cause stitch skew, needle skipping, twist and other problems, with good sewing effect.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and in particular to a cover-up sewing machine and an automatic hem machine. Background Technology

[0002] The current automatic hem cutting machine includes a sewing head unit, an auxiliary feeding mechanism, a correction unit, and an expansion unit. The main working process is as follows: the fabric is placed in the designated position, and then the fabric is fed through the sewing auxiliary feeding mechanism. At this time, the sewing unit does not work. The detection unit finds the starting position. After finding the starting position, the sewing unit and the correction unit start working synchronously to complete the automatic sewing operation.

[0003] In related technologies, the sewing unit also includes a feeding function, and it uses an intermittent feeding structure, while the auxiliary feeding mechanism provides continuous feeding. This leads to a matching problem between the two, primarily manifested in the inconsistent feed and release speeds of different fabrics due to varying tooth heights, presser foot pressures, and fabric types. Furthermore, different fabrics exhibit inconsistent auxiliary feeding speeds on the auxiliary feeding mechanism. For a new fabric, repeated adjustments to relevant parameters are often necessary to achieve optimal sewing results. Poor matching can pull on the fabric, causing issues such as skewing stitches, skipped stitches, and twisting. Additionally, due to the current presser foot feeding structure, the presser foot is always pressed against the fabric, resulting in the presser foot pushing the fabric during the feed pass, leading to denser stitches.

[0004] Therefore, how to provide a cover-up sewing machine and an automatic hem-down machine to at least partially improve the above-mentioned drawbacks is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a cover-up sewing machine and an automatic hem-down machine that can avoid the problem of excessive stitch density caused by the presser foot pushing the material. At the same time, it only uses an auxiliary feeding mechanism for feeding, so there is no problem of matching the feeding function of the auxiliary feeding mechanism and the sewing unit. This can avoid problems such as skewing, skipped stitches, and twisting caused by pulling the fabric when the two are not matched well, and has a better sewing effect.

[0006] To achieve the above objectives, this utility model provides a coverstitch sewing machine, comprising:

[0007] The needle bar can move in the vertical direction;

[0008] The needle is fixedly connected to the needle bar;

[0009] The first stop is fixedly connected to the needle bar;

[0010] The second stop is located below the first stop. The second stop is connected to the first stop via a drive assembly. The drive assembly is used to drive the second stop to press down on the fabric before the needle moves down and pierces the fabric, and to drive the second stop to move up and away from the fabric after the needle moves up and leaves the fabric.

[0011] In one possible implementation, the first stop block is provided with a through hole whose axis extends in the vertical direction;

[0012] The driver components include:

[0013] The guide rod includes a rod body extending in the vertical direction and a stop connected to the top of the rod body. The bottom of the rod body passes through a through hole and is fixedly connected to a second stop. The stop is used to restrict the guide rod from disengaging downward from the first stop.

[0014] An elastic element is sleeved on the rod body and located between the first stop and the second stop. The elastic element is used to drive the second stop away from the first stop.

[0015] In one possible implementation, the driving component includes:

[0016] The elastic element has one end connected to the side of the first stop block facing the second stop block, and the other end connected to the side of the second stop block facing the first stop block;

[0017] A guide component, connected to the second stop, is used to guide the second stop to move in the vertical direction.

[0018] In one possible implementation, the guiding component includes:

[0019] A through hole is provided in the first stop block, and the axis of the through hole extends in the vertical direction;

[0020] The guide rod is fixedly connected to the second stop at one end, and passes through the through hole at the other end. The axis of the guide rod is collinear with the axis of the through hole.

[0021] In one possible implementation, there are two through holes and two guide rods, and the through holes and guide rods correspond one-to-one.

[0022] In one possible implementation, a first sound-insulating pad is provided on the side of the stop facing the first stop block.

[0023] In one possible implementation, a second sound-insulating pad is provided on the side of the first stop facing the stop head.

[0024] In one possible implementation, the device also includes a housing and a detection assembly, the detection assembly including a detector fixed relative to the housing and a sensing plate fixed relative to the needle, the detector being used to detect the sensing plate.

[0025] In one possible implementation, a bracket is provided between the housing and the detector. The bracket includes a first fixed end connected to the housing and a second fixed end connected to the detector. The bracket is used to adjust the height of the detector.

[0026] Based on the above, this application also provides an automatic hem-down machine, including an auxiliary feeding mechanism and a cover-stitching machine as described in any of the above embodiments. The auxiliary feeding mechanism is used to drive the fabric to move when the needle and the second stop leave the fabric.

[0027] Compared with the prior art, the technical solution provided by this utility model has at least the following beneficial effects:

[0028] The needle and the first stop are fixedly connected to the needle bar. When the needle bar moves downward, it drives the needle and the first stop to move downward synchronously. When the needle bar moves upward, it drives the needle and the first stop to move upward synchronously. The second stop is connected to the first stop through a drive assembly. When the first stop moves downward, the drive assembly can drive the second stop to press the fabric tightly before the needle pierces it, preventing unstable needle insertion. When the first stop moves upward, the drive assembly can drive the second stop to leave the fabric after the needle leaves, avoiding interference with the auxiliary feeding mechanism. The second stop not only presses the fabric tightly during needle sewing but also leaves the fabric after the needle leaves, avoiding the problem of excessive stitch density caused by contact with the fabric during feeding. Furthermore, since feeding is only done through the auxiliary feeding mechanism, there is no issue of matching the feeding function of the auxiliary feeding mechanism with the sewing unit. This avoids problems such as skewing, skipped stitches, and twisting caused by poor matching, resulting in better sewing performance. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the automatic heel counter provided in an embodiment of the present utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the overlock sewing machine provided in an embodiment of the present utility model;

[0032] Figure 3 A partially enlarged view of the overlock sewing machine provided in an embodiment of this utility model;

[0033] Figure 4 This is a schematic diagram of the detection component provided in an embodiment of the present invention.

[0034] in:

[0035] 100-needle bar;

[0036] 200-needle;

[0037] 300 - First stop;

[0038] 400 - Second stop;

[0039] 511-rod body, 512-stop, 520-elastic element;

[0040] 610 - Detector, 620 - Bracket, 621 - First connection hole;

[0041] 700 - Housing, 710 - Second connection hole;

[0042] 800 - Auxiliary feeding mechanism. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0046] The purpose of this invention is to provide a cover-up sewing machine and an automatic hem-down machine that can avoid the problem of excessive stitch density caused by the presser foot pushing the material. At the same time, it only uses an auxiliary feeding mechanism for feeding, so there is no problem of matching the feeding function of the auxiliary feeding mechanism and the sewing unit. This can avoid problems such as skewing, skipped stitches, and twisting caused by pulling the fabric when the two are not matched well, and has a better sewing effect.

[0047] Please see Figures 1 to 4To achieve the above objectives, this utility model provides a coverstitch sewing machine, including a needle bar 100, a needle 200, a first stop 300, and a second stop 400. The needle bar 100 is movable in the vertical direction. The needle 200 is fixedly connected to the needle bar 100, specifically to the bottom of the needle bar 100, and is used to sew by passing through the fabric upwards or downwards under the drive of the needle bar 100. The first stop 300 is fixedly connected to the needle bar 100, and the second stop 400 is located below the first stop 300. The second stop 400 has an opening that extends from top to bottom through the second stop 400 and is located below the needle 200, allowing the needle 200 to pass through. The second stop 400 is connected to the first stop 300 via a drive assembly. The drive assembly is used to drive the second stop 400 to press down on the fabric before the needle 200 moves down and pierces the fabric, and to drive the second stop 400 to move up and away from the fabric after the needle 200 moves up and away from the fabric. The connection between the first stop block 300 and the needle bar 100 can be in various ways. For example, the first stop block 300 may include two connecting parts. The two connecting parts are provided with arc-shaped grooves, and the two arc-shaped grooves can be closed to form a circular groove. After the arc-shaped grooves of the two connecting parts are fitted with the needle bar 100, they are connected by a fixing member. Tightening the fixing member will cause the two connecting parts to clamp the needle bar 100. When it is necessary to adjust the position of the first stop block 300, loosen the fixing member, move it to the preset height, and then tighten the fixing member again.

[0048] The needle 200 and the first stop 300 are fixedly connected to the needle bar 100. When the needle bar 100 moves down, it drives the needle 200 and the first stop 300 to move down synchronously. When the needle bar 100 moves up, it drives the needle 200 and the first stop 300 to move up synchronously. The second stop 400 is connected to the first stop 300 through a drive assembly. When the first stop 300 moves down, the drive assembly can drive the second stop 400 to press the fabric tightly before the needle 200 pierces the fabric, preventing the needle 200 from piercing the fabric unstablely. When the first stop 300 moves up, the drive assembly can drive the second stop 400 to leave the fabric after the needle 200 leaves the fabric, avoiding interference with the auxiliary feeding mechanism 800 in feeding the fabric. The second stop 400 not only presses the fabric tightly when the needle 200 is sewing, but also leaves the fabric after the needle 200 leaves, avoiding the problem of excessive stitch density caused by contact with the fabric during feeding. At the same time, it feeds the fabric only through the auxiliary feeding mechanism 800, so there is no problem of matching the feeding function of the auxiliary feeding mechanism 800 with the sewing unit. This avoids problems such as skewing, skipped stitches, and twisting caused by pulling the fabric when the two are not matched well, resulting in a better sewing effect.

[0049] The drive assembly has multiple implementations. In one possible embodiment, the first stop 300 has a through hole with its axis extending vertically. The drive assembly includes a guide rod and an elastic element 520. The guide rod includes a rod body 511 extending vertically and a stop head 512 connected to the top of the rod body 511. The bottom of the rod body 511 passes through the through hole from top to bottom and is fixedly connected to the second stop 400. The cross-sectional dimension of the stop head 512 perpendicular to the vertical direction is larger than the cross-sectional dimension of the through hole perpendicular to the vertical direction, so that the stop head 512 located above the first stop 300 cannot pass through the through hole from top to bottom, thereby allowing the stop head 512 to be used to restrict the guide rod from disengaging from the first stop 300 downwards. The elastic element 520 is sleeved on the rod body 511 and located between the first stop 300 and the second stop 400. The elastic element 520 is used to drive the second stop 400 away from the first stop 300. The elastic element 520 can be, but is not limited to, a spring.

[0050] When the needle 200 moves to the highest point, the stop 512 of the guide rod is engaged with the first stop 300, and the elastic element 520 drives the second stop 400 away from the first stop 300, so that the bottom plane of the second stop 400 is lower than the needle 200. As the needle 200 moves downward, the first stop 300, the drive assembly, and the second stop 400 move downward synchronously until the second stop 400 contacts the fabric. At this point, the second stop 400 and the guide rod can no longer move downward. The first stop 300 continues to move downward, pushing the elastic element 520 to compress, causing the elastic element 520 to press the second stop 400 firmly onto the fabric. Then, the needle 200 pierces the fabric to sew. Afterward, the needle 200 and the first stop 300 move upward synchronously. After the needle 200 leaves the fabric, the first stop 300 contacts the stop head 512, causing the guide rod to move upward. The guide rod then causes the second stop 400 to move upward, releasing the fabric, and the auxiliary feeding mechanism 800 begins feeding.

[0051] In another possible implementation, the drive assembly includes an elastic element 520 and a guide assembly. One end of the elastic element 520 is connected to the side of the first stop 300 facing the second stop 400, and the other end is connected to the side of the second stop 400 facing the first stop 300. The elastic element 520 can be, but is not limited to, a spring. When the spring is compressed, it tends to drive the first stop 300 and the second stop 400 away from each other; when the spring is stretched, it tends to drive the first stop 300 and the second stop 400 closer to each other. The guide assembly is connected to the second stop 400 and is used to guide the second stop 400 to move in the vertical direction to avoid the second stop 400 from shifting. The guide assembly includes a guide rod and a through hole in the first stop 300, the axis of which extends in the vertical direction. One end of the guide rod is fixedly connected to the second stop 400, and the other end passes through the through hole. The axis of the guide rod is collinear with the axis of the through hole, and it is used to guide the movement of the second stop 400.

[0052] When the needle 200 moves to its highest point, the second stop 400 stretches the elastic element 520 under the action of gravity, and the bottom plane of the second stop 400 is lower than the needle 200. When the needle 200 moves downward, the first stop 300, the drive assembly, and the second stop 400 move downward synchronously until the second stop 400 contacts the fabric. The second stop 400 and the guide rod can no longer move downward, and the first stop 300 continues to move downward, pushing the elastic element 520 to compress, so that the elastic element 520 presses the second stop 400 tightly onto the fabric. Then the needle 200 pierces the fabric to sew. After that, the needle 200 and the first stop 300 move upward synchronously. After the needle 200 leaves the fabric, the first stop 300 pulls the second stop 400 upward through the elastic element 520 to release the fabric, and the auxiliary feeding mechanism 800 starts feeding.

[0053] In one possible implementation, there are two through holes and two guide rods, with each through hole corresponding to one guide rod. The two through holes and the two guide rods are spaced apart, which effectively disperses stress and avoids the stress concentration problem caused by having only one through hole and one guide rod. Specifically, a first sound-insulating pad is provided on the side of the stop 512 facing the first stop block 300, and / or a second sound-insulating pad is provided on the side of the first stop block 300 facing the stop 512. The provision of the first and / or second sound-insulating pads effectively reduces the noise that may be generated during the contact between the first stop block 300 and the stop 512.

[0054] In one possible implementation, the coverstitch machine further includes a housing 700 and a detection assembly. The detection assembly includes a detector 610 fixed relative to the housing 700 of the coverstitch machine and a sensor plate fixed relative to the needle 200. The detector 610 is used to detect the sensor plate. By fixing the height of the detector 610 and the fixed position of the sensor plate on the needle bar 100, the position of the needle 200 when the detector 610 detects the sensor plate can be determined, thereby determining whether the needle 200 has left the fabric.

[0055] Furthermore, a bracket 620 is provided between the housing 700 and the detector 610. The bracket 620 includes a first fixed end connected to the housing 700 and a second fixed end connected to the detector 610. The bracket 620 is used to adjust the height of the detector 610. Specifically, the second fixed end is provided with a first connecting hole 621, and the housing 700 is provided with a second connecting hole 710. The first connecting hole 621 and the second connecting hole 710 correspond one-to-one. The connector is fixed after passing through the corresponding first connecting hole 621 and second connecting hole 710, so that the position of the bracket 620 is fixed. The first connecting hole 621 is an oblong hole. By the connector passing through different positions in the oblong hole, the bottom of the bracket 620 is at different heights, so as to be adjusted according to actual needs. The second connecting hole 710 can be, but is not limited to, a threaded hole, and the connector can be, but is not limited to, a screw, so as to facilitate the installation and disassembly of the bracket 620.

[0056] Based on the above, this application also provides an automatic hem-dropping machine, including an auxiliary feeding mechanism 800 and a coverstitch sewing machine according to any of the above embodiments. The auxiliary feeding mechanism 800 is used to move the fabric when the needle 200 and the second stop 400 leave the fabric. The feeding time of the auxiliary feeding mechanism 800 is triggered by the transmission signal when the detector 610 detects the sensing sheet, ensuring that the matching between the auxiliary feeding mechanism 800 and the needle 200 and the second stop 400 is as follows: when the needle 200 and the second stop 400 leave the fabric, the auxiliary feeding mechanism 800 feeds; when the needle 200 and the second stop 400 have not left the fabric, the auxiliary feeding mechanism 800 does not feed.

[0057] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A cover-stitching machine, characterized in that, include: The needle bar (100) is capable of moving in the vertical direction; The needle (200) is fixedly connected to the needle bar (100); The first stop (300) is fixedly connected to the needle bar (100); The second stop (400) is located below the first stop (300). The second stop (400) is connected to the first stop (300) via a drive assembly. The drive assembly is used to drive the second stop (400) to press down on the fabric before the needle (200) moves down and inserts into the fabric, and to drive the second stop (400) to move up and away from the fabric after the needle (200) moves up and away from the fabric.

2. The overlock sewing machine according to claim 1, characterized in that, The first stop (300) is provided with a through hole whose axis extends along the vertical direction; The driving component includes: The guide rod includes a rod body (511) extending along the vertical direction and a stop (512) connected to the top of the rod body (511). The bottom of the rod body (511) passes through the through hole and is fixedly connected to the second stop (400). The stop (512) is used to restrict the guide rod from disengaging downward from the first stop (300). An elastic element (520) is sleeved on the rod body (511) and located between the first stop (300) and the second stop (400). The elastic element (520) is used to drive the second stop (400) away from the first stop (300).

3. The overlock sewing machine according to claim 1, characterized in that, The driving component includes: The elastic element (520) has one end connected to the side of the first stop (300) facing the second stop (400), and the other end connected to the side of the second stop (400) facing the first stop (300); A guide component, connected to the second stop (400), is used to guide the second stop (400) to move in the vertical direction.

4. The overlock sewing machine according to claim 3, characterized in that, The guiding component includes: A through hole is provided in the first stop block (300), and the axis of the through hole extends along the vertical direction; The guide rod has one end fixedly connected to the second stop (400) and the other end passes through the through hole. The axis of the guide rod is collinear with the axis of the through hole.

5. The overlock sewing machine according to claim 2 or 4, characterized in that, There are two through holes and two guide rods, and each through hole corresponds to one guide rod.

6. The overlock sewing machine according to claim 2, characterized in that, The stop (512) is provided with a first sound insulation pad on the side facing the first stop (300).

7. The overlock sewing machine according to claim 2, characterized in that, The first stop (300) is provided with a second sound insulation pad on the side facing the stop head (512).

8. The overlock sewing machine according to any one of claims 1-4, characterized in that, It also includes a housing (700) and a detection assembly, the detection assembly including a detector (610) fixed relative to the housing (700) and a sensing plate fixed relative to the needle (200), the detector (610) being used to detect the sensing plate.

9. The overlock sewing machine according to claim 8, characterized in that, A bracket (620) is provided between the housing (700) and the detector (610). The bracket (620) includes a first fixed end connected to the housing (700) and a second fixed end connected to the detector (610). The bracket (620) is used to adjust the height of the detector (610).

10. An automatic hem-dropping machine, characterized in that, Includes an auxiliary feeding mechanism (800) and a cover-stitching machine as described in any one of claims 1-9, wherein the auxiliary feeding mechanism (800) is used to move the fabric when the needle (200) and the second stop (400) leave the fabric.

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