Automatic presser foot adjusting device of sewing equipment and sewing equipment

Abstract

The utility model relates to an automatic presser foot adjusting device of sewing equipment and the sewing equipment, and the automatic presser foot adjusting device comprises a machine shell, a presser foot adjusting device and a pressing foot adjusting device, and the machine shell is fixedly provided with a support assembly; the presser foot is rotationally mounted on the bracket assembly; the first air cylinder is in transmission connection with the presser foot and is used for maintaining the pressure of the presser foot on the cloth; the detection assembly is used for detecting the thickness change of the cloth; and the second cylinder is in transmission connection with the presser foot and is used for correspondingly lifting the presser foot according to a signal of the detection assembly. According to the technical scheme, the thickness change of the cloth is detected through the detection assembly, the presser foot is automatically adjusted to achieve self-adaption to different thicknesses of the cloth, and the technical advantages of being high in production flexibility, high in production efficiency, good in stability and the like are achieved while the product quality is guaranteed.

Description

Technical Field

[0001] This application relates to the field of sewing equipment technology, and more particularly to an automatic presser foot adjustment device for sewing equipment and sewing equipment. Background Technology

[0002] Sewing machines primarily join multiple layers of fabric together by stitching. During the sewing process, the presser foot applies downward pressure to keep the fabric firmly against the sewing table, preventing slippage or shifting and ensuring neat stitches. Because of the seams, style, and shape of the garment, the fabric thickness at the sewing location often varies.

[0003] For example, in the hemming process of jeans, the sewing thickness can vary from 3 layers of fabric to 12 layers and then back to 3 layers in the fabric feeding direction. If the presser foot maintains constant pressure, the increased fabric thickness often leads to reduced feeding efficiency, resulting in "fabric blockage" at the seam. This causes the stitch spacing in that area to be significantly smaller than normal, resulting in an overly dense stitch pattern on the product. In cases where the fabric is elastic or the equipment's feeding capacity is insufficient, the problem of unstable stitch spacing is further amplified. For instance, when the thickened area of ​​the fabric passes through the sewing area, the elasticity is released, causing subsequent stitch spacing to be significantly larger than normal, further resulting in an overly sparse stitch pattern and affecting the stability of product quality.

[0004] To address the aforementioned issues, existing technologies aim to minimize presser foot pressure to reduce resistance to the fabric and prevent fabric blockage at the seams. However, in practice, to avoid insufficient presser foot pressure leading to skipped stitches and inability to hold the fabric in place, the pressure must be reduced as much as possible while ensuring no skipped stitches. This still results in denser stitches at the seams, creating a dilemma in presser foot pressure adjustment and leaving room for improvement. Utility Model Content

[0005] This application provides an automatic presser foot adjustment device for sewing equipment, which can automatically adjust the presser foot to a preset height according to the thickness of the fabric, so as to avoid the presser foot from blocking the fabric at the rib and ensure the constraint of the fabric on the fabric, thereby reducing the risk of skipped stitches.

[0006] One embodiment of this application discloses an automatic presser foot adjustment device for sewing equipment, comprising:

[0007] A housing, wherein a bracket assembly is fixedly mounted on the housing;

[0008] The pressure foot is rotatably mounted on the bracket assembly;

[0009] The first cylinder is connected to the presser foot and is used to maintain the pressure of the presser foot on the fabric.

[0010] A detection component used to detect changes in fabric thickness;

[0011] The second cylinder is connected to the pressure foot and is used to lift the pressure foot according to the signal from the detection component.

[0012] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0013] In one embodiment, the first cylinder and the second cylinder are arranged side by side and the piston rods move in parallel directions.

[0014] In one embodiment, the automatic presser foot adjustment device further includes:

[0015] A linkage component is driven between the second cylinder and the pressure foot. The second cylinder remains in its current state, and the linkage component allows the pressure foot to adjust its position under the drive of the first cylinder.

[0016] In one embodiment, the linkage component includes:

[0017] The driving component is fixed to the piston rod of the second cylinder;

[0018] The driven member is fixed to the pressure foot;

[0019] One of the driving member and the driven member is provided with a stroke release bar hole, and the other extends into the stroke release bar hole.

[0020] In one embodiment, the driving element is a lifting seat and a piston rod connected to the second cylinder, and the stroke release bar hole is formed in the lifting seat;

[0021] The driven member is a linkage rod fixed to the pressure foot, and at least a portion of the linkage rod is inserted into the stroke release bar hole.

[0022] In one embodiment, the detection component has a detection position in contact with the fabric, located upstream of the presser foot along the fabric transport direction.

[0023] In one embodiment, the detection component includes:

[0024] The base is fixed to the housing;

[0025] A sensor plate is rotatably mounted on the base, and the sensor plate is used to press against the top surface of the fabric.

[0026] The sensor detects the rotation of the sensing plate and outputs a corresponding signal.

[0027] In one embodiment, the detection component further includes:

[0028] An elastic element acts between the base and the sensing sheet to drive the sensing sheet to adhere tightly to the top surface of the fabric.

[0029] In one embodiment, the sensing sheet is V-shaped, and contacts the fabric through the outer side of the turning part in the V-shape.

[0030] One embodiment of this application also discloses a sewing device, including the automatic presser foot adjustment device described in the above technical solution.

[0031] The technical solution in this application detects the thickness change of the fabric through a detection component and automatically adjusts the presser foot to achieve self-adaptation for different fabric thicknesses. While ensuring product quality, it has technical advantages such as high production flexibility, high production efficiency, and good stability. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of an automatic presser foot adjustment device for a sewing machine according to an embodiment of this application;

[0034] Figure 2 for Figure 1 Schematic diagram of the linkage components of the automatic adjustment device for the middle pressure foot;

[0035] Figure 3 for Figure 1 Schematic diagram of the detection component structure of the automatic adjustment device for the middle pressure foot;

[0036] Figure 4 This is a schematic diagram of the automatic presser foot adjustment device of the sewing equipment in normal sewing operation according to an embodiment of this application;

[0037] Figure 5 for Figure 4 A schematic diagram showing the cooperation between the detection component of the automatic presser foot adjustment device and the fabric boning position;

[0038] Figure 6 for Figure 4 A schematic diagram showing the fit between the presser foot of the automatic presser foot adjustment device and the fabric boning position;

[0039] Figure 7This is a schematic diagram of a sewing device in one embodiment of this application.

[0040] The component labels are as follows:

[0041] 100. Housing; 110. Bracket assembly; 111. Cylinder bracket; 112. Presser foot bracket;

[0042] 200. Presser foot; 210. Connector; 220. Foot plate;

[0043] 300, First cylinder; 310, Drive base; 311, Stabilizer; 312, Drive hole;

[0044] 400. Second cylinder; 410. Linkage assembly; 411. Driving component; 412. Driven component; 413. Stroke release bar hole;

[0045] 500. Detection component; 510. Base; 511. Sensor frame; 512. Rotating shaft; 520. Sensor plate; 530. Sensor; 540. Elastic element;

[0046] 900, Fabric; 910, Bone position; 920, Needle. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0052] Reference Appendix Figure 1 The embodiment shown discloses an automatic presser foot adjustment device for sewing equipment, including a machine housing, a presser foot 200 mounted on the machine housing, a first cylinder 300 and a second cylinder 400 for driving the presser foot 200 to move relative to the machine housing, and a detection component 500 for detecting changes in the thickness of fabric 900. In this embodiment, the detection component 500 detects changes in the thickness of the fabric 900, and the sewing equipment can automatically adjust the presser foot 200 based on the detection signal from the detection component 500 to achieve adaptive adjustment for different thicknesses of fabric 900, thereby avoiding product quality fluctuations caused by fabric blockage at the seam and ensuring that the needle 920 can form stable and aesthetically pleasing stitches on the product. Furthermore, the adaptive adjustment for different thicknesses of fabric 900 allows the sewing equipment to adapt to more types of fabric 900 and more styles of garment sewing, thereby improving production flexibility, production efficiency, and production stability.

[0053] Specifically, the housing 100 is fixedly mounted with a bracket assembly 110, and the pressure foot 200 is rotatably mounted on the bracket assembly 110. (See attached document) Figure 1 and attached Figure 2 In the illustrated embodiment, the support assembly 110 includes a cylinder frame 111 fixed relative to the housing 100 and a presser foot frame 112 connected to the cylinder frame 111. The cylinder frame 111 and the presser foot frame 112 can be an integral structure or separate structures interconnected by an intermediate component. The presser foot 200 includes a connector 210 rotatable to the presser foot frame 112 and a foot plate 220 fixedly mounted on the connector 210, the foot plate 220 interacting with the fabric 900. (See attached diagram.) Figure 4 It can be seen that the foot plate 220 is suspended above the sewing table. The presser foot 112 and the foot plate 220 are respectively connected to the two ends of the connector 210, and the first cylinder 300 and the second cylinder 400 act on the middle of the connector 210.

[0054] The presser foot 200 is driven by a first cylinder 300 and a second cylinder 400. The first cylinder 300 maintains the pressure of the presser foot 200 on the fabric 900, and the second cylinder 400 lifts the presser foot 200 according to the signal from the detection component 500. The first cylinder 300 and the second cylinder 400 can work together or independently. In embodiments where the first cylinder 300 and the second cylinder 400 need to work together to control the presser foot 200, there are various working methods. For example, the first cylinder 300 and the second cylinder 400 may work intermittently to control the presser foot 200 to different positions; or the first cylinder 300 and the second cylinder 400 may work in opposition to control the presser foot 200 to different positions; or, for example, [further details omitted]. Figure 2 In the illustrated embodiment, the automatic presser foot adjustment device further includes a linkage component 410, which is tractively connected between the second cylinder 400 and the presser foot 200. The second cylinder 400 remains in its current state, and the linkage component 410 allows the presser foot 200 to adjust its position under the drive of the first cylinder 300. In this embodiment, the linkage component 410 can decouple the first cylinder 300 and the second cylinder 400, thereby meeting flexible control requirements.

[0055] Furthermore, the linkage component 410 includes:

[0056] The driving component 411 is fixed to the piston rod of the second cylinder 400;

[0057] Follower 412 is fixed to presser foot 200.

[0058] One of the driving member 411 and the driven member 412 is provided with a stroke release slot 413, and the other extends into the stroke release slot 413. That is, the driving member 411 and the driven member 412 have unidirectional transmission or there is a free movement stroke between the driving member 411 and the driven member 412. For example, in this embodiment, the driving member 411 is a lifting seat and a piston rod connected to the second cylinder 400, and the stroke release slot 413 is opened in the lifting seat; the driven member 412 is a linkage rod fixed to the pressure foot 200, and at least a part of the linkage rod is inserted into the stroke release slot 413. The stroke release slot 413 can be a closed slot or a unidirectional open hole. The linkage rod can move freely in the stroke release slot 413, corresponding to when the second cylinder 400 is kept stationary, the pressure foot 200 can adjust its relative position under the action of the first cylinder 300 and be subjected to a holding force to maintain the position. The linkage rod can abut against and press against the side edge of the stroke release bar hole 413, corresponding to the second cylinder 400 being able to drive the presser foot 200 to change its relative position through the stroke release bar hole 413. During this process, the first cylinder 300 can be in a free state, that is, the two do not produce mutual resistance; during this process, the first cylinder 300 can also be in a working state, that is, the second cylinder 400 resists the holding force applied by the first cylinder 300 to the presser foot 200 to drive the presser foot 200 to move.

[0059] The connection between the first cylinder 300 and the pressure foot 200 can be implemented independently of the second cylinder 400, or they can share a portion of the transmission components. (See attached reference.) Figure 2 In the illustrated embodiment, the piston rod of the first cylinder 300 is connected to a drive seat 310. The drive seat 310 has a drive hole 312 for the linkage rod to pass through. The drive hole 312 and the linkage rod can be connected by unidirectional or bidirectional transmission. In this embodiment, the inner edge shape of the drive hole 312 is adapted to the outer periphery shape of the linkage rod. Furthermore, the middle part of the linkage rod is controlled by the drive hole 312, and both ends are adapted to the pressure foot 200 and the stroke release strip hole 413, respectively. That is, the drive seat 310 is located between the lifting seat and the pressure foot 200. To improve the stability of the movement of each component, the drive seat 310 is provided near the pressure foot bracket 112, including a stabilizer 311 extending to the side of the pressure foot bracket 112. When the drive seat 310 moves relative to the pressure foot bracket 112, the stabilizer 311 moves relative to the side edge of the pressure foot bracket 112. The stabilizer 311 can be abutted against or spaced with the presser foot 112. The side of the presser foot 112 facing the stabilizer 311 serves as a retaining surface for maintaining the relative spatial position of the stabilizer 311. The presser foot 112 is plate-shaped, and the stabilizer 311 can be installed individually or in pairs. Pairs of stabilizers 311 are respectively fitted onto the retaining surfaces on different sides of the presser foot 112.

[0060] Combined with appendix Figure 1In the embodiment shown, the first cylinder 300 and the second cylinder 400 are arranged side by side and the piston rods move in parallel directions.

[0061] The motion control of the first cylinder 300 and the second cylinder 400 is based on the signal from the detection component 500. (See attached document) Figure 1 In the illustrated embodiment, the detection component 500 has a detection position that contacts the fabric 900. Along the fabric 900 transport direction, the detection position is upstream of the presser foot 200, meaning the presser foot 200 adjusts its position according to the thickness of the fabric 900 about to enter the sewing position. See attached figure for details. Figure 3 As shown, the detection component 500 includes:

[0062] Base 510, fixed to housing 100;

[0063] The sensing element 520 is rotatably mounted on the base 510 and is used to press against the top surface of the contact fabric 900.

[0064] Sensor 530 detects the rotation of sensor 520 and outputs a corresponding signal.

[0065] Furthermore, the base 510 is provided with a sensor frame 511 for positioning the sensor 530, which positions the sensor 530 near the sensor plate 520. The base 510 is provided with a rotating shaft 512, to which the sensor plate 520 is connected for rotatable mounting. When the thickness of the conveyed fabric 900 changes, the sensor plate 520 is driven by the fabric 900 to rotate and change position, triggering the sensor 530 to output a signal. To ensure that the sensor plate 520 maintains constant contact with the top surface of the fabric 900, the detection assembly 500 also includes an elastic element 540. The elastic element 540 acts between the base 510 and the sensor plate 520 to drive the sensor plate 520 to adhere tightly to the top surface of the fabric 900. In this embodiment, the elastic element 540 is a coil spring disposed on the rotating shaft 512. The elastic element 540 and the sensing plate 520 are respectively located at both ends of the rotating shaft 512. The elastic element 540 applies a force to the sensing plate 520 through the rotating shaft 512. The elastic force of the elastic element 540 should be set to ensure that the sensing plate 520 is in constant contact with the fabric 900 without obstructing the conveying of the fabric 900 and avoiding fabric blockage. Correspondingly, the sensing plate 520 is V-shaped, and contacts the fabric 900 through the outer side of the bend in the V-shape. The bend in the V-shape can reduce the resistance applied by the sensing plate 520 to the fabric 900.

[0066] With the cooperation of the first cylinder 300 and the second cylinder 400, the presser foot 200 can achieve more control methods. In addition to the functions mentioned above, the first cylinder 300 can also be used to lift the presser foot 200 when conveying the fabric 900, etc. For example, the following is combined with the appendix Figure 3 To be continued Figure 5The working process of the automatic presser foot adjustment device in this application is described.

[0067] As attached Figure 4 As shown, presser foot 200 is in normal sewing mode at this time. The foot plate 220 of presser foot 200 is suspended from the sewing table, meaning there is a certain gap between them, the size of which does not exceed the normal thickness of the fabric being sewn. The purpose is to minimize the resistance of presser foot 200 to the fabric.

[0068] As attached Figure 5 As shown, as the fabric 900 is conveyed, the thickened area on the fabric 900 (e.g., the rib 910) moves to the vicinity of the detection component 500. After the sensing plate 520 is lifted by the rib 910 of the fabric 900, the sensor 530 outputs a corresponding signal. The signal is transmitted to the control system. The control system calculates the control timing of the first cylinder 300 and / or the second cylinder 400 based on the preset distance between the sensing plate 520 and the presser foot 200.

[0069] As attached Figure 6 As shown, as the fabric 900 is conveyed, the rib 910 of the fabric 900 approaches the foot plate 220 of the presser foot 200. The second cylinder 400 retracts and rises via the lifting seat, thereby raising the presser foot 200 to a preset height. In this embodiment, the lifting height of the presser foot 200 is no greater than the thickness of the rib 910, thus eliminating the fabric blockage phenomenon at the rib 910. After the rib 910 passes the presser foot 200, the piston rod of the second cylinder 400 extends outward, causing the presser foot 200 to return to its original position. Figure 4 The state shown indicates that the entire bone position 910 adjustment is now complete.

[0070] Combining the above description and the appendix Figure 7 As shown, one embodiment of this application also discloses a sewing device, including the automatic presser foot adjustment device described above. The machine housing 100 includes a lower housing for providing a sewing table and an upper housing for mounting the presser foot, wherein a detection component is disposed on the sewing table, and a feed roller for fabric feeding is provided inside the lower housing. Other specific details of the automatic presser foot adjustment device can be found in the above description. The configuration of other parts of the sewing device can be implemented in conjunction with existing technology and will not be elaborated further here.

[0071] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An automatic presser foot adjustment device for sewing equipment, characterized in that, include: A housing, wherein a bracket assembly is fixedly mounted on the housing; The pressure foot is rotatably mounted on the bracket assembly; The first cylinder is connected to the presser foot and is used to maintain the pressure of the presser foot on the fabric. A detection component used to detect changes in fabric thickness; The second cylinder is connected to the pressure foot and is used to lift the pressure foot according to the signal from the detection component.

2. The automatic presser foot adjustment device for sewing equipment according to claim 1, characterized in that, The first cylinder and the second cylinder are arranged side by side and the piston rods move in parallel directions.

3. The automatic presser foot adjustment device for sewing equipment according to claim 1, characterized in that, The automatic presser foot adjustment device also includes: A linkage component is driven between the second cylinder and the pressure foot. The second cylinder remains in its current state, and the linkage component allows the pressure foot to adjust its position under the drive of the first cylinder.

4. The automatic presser foot adjustment device for sewing equipment according to claim 3, characterized in that, The linkage component includes: The driving component is fixed to the piston rod of the second cylinder; The driven member is fixed to the pressure foot; One of the driving member and the driven member is provided with a stroke release bar hole, and the other extends into the stroke release bar hole.

5. The automatic presser foot adjustment device for sewing equipment according to claim 4, characterized in that, The driving component is a lifting seat and a piston rod connected to the second cylinder; the stroke release bar hole is opened in the lifting seat. The driven member is a linkage rod fixed to the pressure foot, and at least a portion of the linkage rod is inserted into the stroke release bar hole.

6. The automatic presser foot adjustment device for sewing equipment according to claim 1, characterized in that, The detection component has a detection position that contacts the fabric, and along the fabric transport direction, the detection position is located upstream of the presser foot.

7. The automatic presser foot adjustment device for sewing equipment according to claim 1, characterized in that, The detection component includes: The base is fixed to the housing; A sensor plate is rotatably mounted on the base, and the sensor plate is used to press against the top surface of the fabric. The sensor detects the rotation of the sensing plate and outputs a corresponding signal.

8. The automatic presser foot adjustment device for sewing equipment according to claim 7, characterized in that, The detection component also includes: An elastic element acts between the base and the sensing sheet to drive the sensing sheet to adhere tightly to the top surface of the fabric.

9. The automatic presser foot adjustment device for sewing equipment according to claim 7, characterized in that, The sensing element is V-shaped, and it contacts the fabric through the outer side of the turning part in the V-shape.

10. A sewing device, characterized in that, Includes the automatic presser foot adjustment device according to any one of claims 1 to 9.

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