Presser foot and hooking device for a serging machine

Abstract

The utility model discloses a kind of presser foot and hook foot device for overlock machine, belong to overlock machine technical field.A kind of presser foot for overlock machine, including the presser foot part being set at overlock machine head, the presser foot part includes: first swing lever, through pin shaft hinged in the lower side of the head of the overlock machine;Second swing lever, hinged at the one end of the first swing lever away from overlock machine head;Pressing plate, through pin shaft rotation in the bottom of the second swing lever rotation is connected;Wherein, the pressing plate includes the bottom plate being rotationally connected with second swing lever, and front pressing plate and rear pressing plate being installed on the bottom plate twice by screw;The utility model can present the effect of decoration at the sewing place of clothes by setting presser foot.

Description

Technical Field

[0001] This utility model relates to the field of overlock machine technology, and in particular to a presser foot and hook for an overlock machine. Background Technology

[0002] A four-thread overlock machine is a specialized piece of equipment used in garment processing. It primarily uses four threads to simultaneously perform overlocking, binding, and reinforcement functions. Its core functions and applicable scenarios are as follows: By using two needles and four threads (two straight needles + two curved needles) to form stable stitches, it can simultaneously cut fabric edges and wrap raw edges, preventing fabric from unraveling. Compared to a three-thread overlock machine, the added straight needle makes its stitches stronger and more elastic, suitable for processing easily deformable fabrics such as knitwear and stretch fabrics. It also provides double stitch reinforcement at critical stress points in garments (such as shoulder seams, armholes, and crotch areas), improving abrasion resistance and tensile strength. It is commonly used in the production of outerwear, sportswear, and denim garments.

[0003] Existing overlock machines primarily focus on practical sewing, while decorative effects require a combination of mechanical adjustments, accessory modifications, and operational skills, resulting in a complex process that cannot meet the needs of actual use. Utility Model Content

[0004] The purpose of this utility model is to solve the problems existing in the prior art by proposing a presser foot and hook foot device for a lockstitch machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A presser foot for a lockstitch machine includes a presser foot portion disposed at the head of the lockstitch machine, the presser foot portion comprising: The first swing arm is hinged to the lower side of the machine head of the overlock machine by a pin, and a torsion spring is provided on the pin; The second swing arm is hinged to the end of the first swing arm away from the head of the overlock machine; The pressure plate is rotatably connected to the bottom of the second rocker arm via a pin. The pressure plate component includes a base plate that is rotatably connected to the second rocker arm, and a front pressure plate and a rear pressure plate that are screwed onto the base plate.

[0006] Preferably, the ends of the front pressure plate and the bottom plate furthest from the rear pressure plate are both set in an arc shape to guide and feed the edge-locking material.

[0007] The present invention also discloses a hook foot device for a superimposed overlock machine, comprising a hook foot portion fixed to the outside of the superimposed overlock machine, characterized in that the hook foot portion comprises: A fixing plate is fixed to the outside of the overlock machine; The universal adjustment component rotates at one end of the fixed plate via a pin. And the hook body, which is connected to the end of the universal adjustment assembly away from the fixed plate.

[0008] Preferably, the universal adjustment assembly includes: A rotating plate rotates at one end of the fixed plate via a pin. The connecting seat is fixed to the end of the rotating plate away from the fixed plate; The connecting plate is fixed to the connecting seat by screws; A connecting bracket is installed on one side of the connecting seat and can be displaced in a direction perpendicular to the connecting plate; The side panel is fixed to the connecting frame with screws. The rotating seat is rotatably connected to the side plate via a pin at one end and to the hook body at the other end.

[0009] Preferably, an adjusting bolt is rotatably connected to the connecting plate, and a nut seat is threaded onto the adjusting bolt. The nut seat is connected to the connecting frame via a support.

[0010] Preferably, the side plate has a groove for the movement of the rotating seat.

[0011] Compared with the prior art, this utility model provides a presser foot and hook for a lockstitch machine, which has the following advantages: 1. This overlock machine uses a presser foot and a hook foot device. By improving the presser foot, a differential presser foot feed dog is adopted, and the hook foot device positions the width to prevent elastic fabric from being stretched and deformed (such as when sewing cuffs, the front dog feed dog is faster and the back dog feed dog is slower). Pressure adjustment enables zero deformation sewing of the fabric, and the finished product has a consistent width.

[0012] 2. The presser foot and hook foot of this overlock machine are improved to reduce the installation accuracy requirements and reduce jamming caused by assembly errors. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the presser foot part of this utility model; Figure 3 This is a schematic diagram of the structure of the hook-foot device of this utility model; Figure 4 This is a schematic diagram showing the connection between the universal adjustment component and the hook body.

[0014] In the diagram: 1. Overlock machine; 2. First swing arm; 3. Second swing arm; 4. Pressure plate; 401. Base plate; 402. Front pressure plate; 403. Rear pressure plate; 5. Hook foot; 6. Fixing plate; 7. Universal adjustment assembly; 701. Rotating plate; 702. Connecting seat; 703. Connecting plate; 7031. Adjusting bolt; 7032. Nut seat; 704. Connecting frame; 705. Side plate; 7051. Groove; 706. Rotating seat; 8. Hook foot body. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0018] like Figures 1 to 3 As shown, this embodiment proposes a presser foot for an overlock machine, including a presser foot portion disposed at the head of the overlock machine 1, the presser foot portion comprising: The first swing arm 2 is hinged to the lower side of the machine head of the overlock machine 1 by a pin, and a torsion spring is provided on the pin; The second swing arm 3 is hinged to the end of the first swing arm 2 away from the head of the overlock machine 1; The pressure plate 4 is rotatably connected to the bottom of the second rocker arm 3 via a pin. The pressure plate component 4 includes a base plate 401 that is rotatably connected to the second rocker arm 3, and a front pressure plate 402 and a rear pressure plate 403 that are installed on the base plate 401 twice by screws. Furthermore, the ends of the front pressure plate 402 and the bottom plate 401 that are away from the rear pressure plate 403 are both set to be arc-shaped to guide and feed the material for the edge locking. Specifically, the first swing arm 2 can rotate relative to the overlock machine 1, providing downward pressure through a torsion spring. During sewing, the bottom plate 401 of the presser foot is in close contact with the fabric, and the front presser plate 402 and the rear presser plate 403 assist in pressing the fabric, clamping the fabric together with the needle plate of the overlock machine 1. When the needle pierces, the presser foot is briefly slightly raised (about 0.5mm) to avoid obstructing the movement of the needle bar; after the needle rises, it immediately returns to its original position under the action of the torsion spring, pressing the fabric tightly. The presser foot remains pressed tightly throughout the entire process. This achieves stable feeding, prevents fabric displacement, and ensures uniform stitch spacing; pressing the fabric makes it less prone to deformation when the needle pierces, reduces the failure of thread loop formation, and effectively prevents skipped stitches; the torsion spring pressure is adjustable, compatible with thin materials (knitted, silk) to thick materials (denim), and can also create a decorative effect at the seams of the garment.

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment proposes a hook foot device for an overlock machine, characterized in that it includes a hook foot portion 5 fixedly disposed on the outside of the overlock machine 1, the hook foot portion 5 comprising: Fixed plate 6 is fixed to the outside of the overlock machine 1; The universal adjustment component 7 is rotatable at one end of the fixed plate 6 via a pin. And the hook body 8, which is connected to the end of the universal adjustment assembly 7 away from the fixed plate 6; like Figure 4 As shown, the universal adjustment assembly 7 further includes: a rotating plate 701, which is rotatable at one end of the fixed plate 6 via a pin; a connecting seat 702, which is fixed to the end of the rotating plate 701 away from the fixed plate 6; a connecting plate 703, which is fixed to the connecting seat 702 by screws; a connecting frame 704, which is installed on one side of the connecting seat 702 and can be displaced in a direction perpendicular to the connecting plate 703; a side plate 705, which is fixed to the connecting frame 704 by screws; and a rotating seat 706, one end of which is rotatably connected to the side plate 705 via a pin, and the other end of which is connected to the hook body 8. Furthermore, an adjusting bolt 7031 is rotatably connected to the connecting plate 703, and a nut seat 7032 is threadedly connected to the adjusting bolt 7031. The nut seat 7032 is connected to the connecting frame 704 through a support. Furthermore, the side plate 705 is provided with a groove 7051 for the rotation of the rotating seat 706; Specifically, when the presser foot is pressing the fabric, the hook body 8 is pushed to the front end of the presser foot by rotating the seat 706, and then the hook body 8 is used to hook the fabric. The hook can be adjusted according to the required width. The universal adjustment component 7 and the adjustment bolt 7031 can improve the adjustment accuracy, solve the pain points of tension imbalance, low efficiency and unstable quality control in traditional machines, and reduce jamming caused by assembly errors.

[0020] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A presser foot for a lockstitching machine, comprising a presser foot portion disposed at the head of a lockstitching machine (1), characterized in that, The presser foot includes: The first swing arm (2) is hinged to the lower side of the head of the overlock machine (1) by a pin, and a torsion spring is provided on the pin; The second swing arm (3) is hinged to the end of the first swing arm (2) away from the head of the overlock machine (1); The pressure plate (4) is rotatably connected to the bottom of the second rocker arm (3) via a pin. The pressure plate component (4) includes a base plate (401) rotatably connected to the second rocker arm (3) and a front pressure plate (402) and a rear pressure plate (403) mounted on the base plate (401) twice by screws.

2. The presser foot for a lockstitching machine according to claim 1, characterized in that, The front pressure plate (402) and the bottom plate (401) are both set to an arc shape at the end away from the rear pressure plate (403) to guide and feed the edge-locking material.

3. A hook-foot device for a lockstitch machine, characterized in that, Includes a hook foot (5) fixed to the outside of the overlock machine (1), the hook foot (5) comprising: The fixing plate (6) is fixed to the outside of the overlock machine (1); The universal adjustment assembly (7) is rotatable at one end of the fixed plate (6) via a pin. And the hook body (8) is connected to the end of the universal adjustment assembly (7) away from the fixed plate (6).

4. The hook-foot device for a lockstitching machine according to claim 3, characterized in that, The universal adjustment assembly (7) includes: The rotating plate (701) rotates at one end of the fixed plate (6) via a pin. A connecting seat (702) is fixed to the end of the rotating plate (701) away from the fixed plate (6); The connecting plate (703) is fixed to the connecting seat (702) by screws; A connecting bracket (704) is installed on one side of the connecting seat (702) and can be displaced in a direction perpendicular to the connecting plate (703); The side plate (705) is fixed to the connecting bracket (704) by screws; The rotating seat (706) is rotatably connected at one end to the side plate (705) via a pin, and at the other end to the hook body (8).

5. A hook-and-loop fastener for a lockstitching machine according to claim 4, characterized in that, An adjusting bolt (7031) is rotatably connected to the connecting plate (703), and a nut seat (7032) is threaded onto the adjusting bolt (7031). The nut seat (7032) is connected to the connecting frame (704) through a support.

6. A hook-and-loop fastener for a lockstitching machine according to claim 4, characterized in that, The side plate (705) has a groove (7051) for the rotation seat (706) to move.

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