Double-concealed-thread presser foot cylinder of sewing machine

Abstract

The utility model relates to the technical field of sewing machines, and discloses a double-concealed-thread presser foot cylinder of a sewing machine, a functional presser foot is detachably installed on the lower portion of a presser foot support, a core rope penetrating hole is formed in the front portion of the functional presser foot, a wrapping forming hole is formed in the upper portion of the functional presser foot, and a detachable presser foot headstock structure is adopted. The functional presser foot is installed on the lower portion of the presser foot support through a notch embedded fastening structure, the functional presser foot is small in size and convenient to replace, and different functional presser feet can be replaced according to machining requirements during use, so that the device can meet the machining requirements of different types of work; the material guiding ring frame is connected and installed through the ring frame supporting arm, installation is convenient, adjustment is flexible, strips entering a material wrapping forming hole can be guided and supported through the material guiding ring frame, manual arrangement is not needed, it is guaranteed that the strips enter smoothly, meanwhile, deviation of the strips can be avoided, the quality of sewn finished products can be improved, and the production efficiency is improved. And the working stability of the device is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a double-hidden-thread presser foot cylinder for a sewing machine. Background Technique

[0002] The presser foot of a sewing machine is an essential component in the feeding mechanism of the sewing machine. Various forms of presser feet play a very important role in the production process, such as those for sewing visible stitches, special presser feet for invisible zippers, and pleating presser feet, etc.

[0003] Currently, decorative strips are sewn on various existing clothes, shoes, and bags. Specifically, see the semi-elliptical decorative strip on the front end shoe upper of a shoe. Sewing this decorative strip is very troublesome. First, one side of the wrapping material is sewn on the shoe upper in the form of a hidden thread. Then, the core rope is placed on the shoe upper and the wrapping material is wrapped around the core rope. Finally, the other side of the wrapping material is sewn on the shoe upper in the form of a visible thread. To facilitate the stitching of the wrapping material, the patent No. CN220012991U discloses a double-hidden-thread sewing machine presser foot, which adopts a double-notch feeding structure. During use, it is not necessary to put the core rope wrapped with the wrapping material into the sewing hole together. Only the core rope and the wrapping material need to be respectively passed through the core rope feeding hole and the wrapping material forming part and pulled out together from the discharge port, and a decorative strip is naturally formed. During the process of pulling out to form the decorative strip, two sewing needles pass through the sewing hole to sew the decorative strip on the article to be sewn. At the same time, there is no visible thread after the decorative strip is sewn, and the wrapping material presses the core rope on the article to be sewn in a wrapped state, and the core rope will not slide randomly, making the decorative strip structure compact and the overall appearance more beautiful.

[0004] This double-hidden-thread sewing machine presser foot has the following drawbacks: The installation structure of its presser foot head seat and the support arm is an integral fixed type. The types of single presser feet for processing the wrapping material are limited, and after the presser foot head seat is worn, the whole presser foot needs to be replaced, resulting in a high use cost. Moreover, it lacks an effective guiding and supporting structure for the decorative strip entering the forming groove. During the stitching process of a longer decorative strip, due to the uneven bending of the strip, wrinkles or skewing are likely to occur at the stitching part of the strip, and the whole strip needs to be guided intermittently, making it very inconvenient to use. Therefore, a double-hidden-thread presser foot cylinder for a sewing machine is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a double-hidden-thread presser foot cylinder for a sewing machine to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A double-hidden-thread presser foot cylinder for a sewing machine, including a presser foot support and a functional presser foot. The functional presser foot is detachably installed at the lower part of the presser foot support. A core rope perforation is arranged at the front part of the functional presser foot, and a wrapping material forming hole is arranged at the upper part of the functional presser foot.

[0007] A guide assembly for guiding and supporting the conveying of decorative strips is provided on the side of the presser foot support, and the guide assembly includes a material guide ring frame, a ring frame support arm and a limiting bolt. The ring frame support arm is installed on the side of the presser foot support by rotating and limiting the limiting bolt. The material guide ring frame is installed on the front part of the ring frame support arm, and an arc-shaped protrusion is provided on the lower part of the inner frame of the material guide ring frame.

[0008] Preferably, the upper portion of the presser foot support is provided with a mounting slot, which is aligned with the mounting slot block on the upper portion of the sewing machine, and the presser foot support is fixed to the upper portion of the sewing machine by means of the mounting slot and bolts.

[0009] Preferably, the core rope through-hole is opened in the middle of the front side of the functional presser foot, the material wrapping forming hole is opened through the upper part of the functional presser foot and forms a bottom through-groove at the lower part of the functional presser foot, a T-shaped forming block is provided inside the material wrapping forming hole, and a discharge trough hole is provided at the rear part of the functional presser foot, and the core rope through-hole and the discharge trough hole are both connected with the material wrapping forming hole.

[0010] Preferably, a mounting groove is provided at the lower portion of the presser foot support, a connecting protrusion is fixedly mounted on the top of the functional presser foot, and the connecting protrusion is aligned and mounted on the inner side of the mounting groove.

[0011] Preferably, a fastening screw hole is provided at the rear of the connecting protrusion, a fastening bolt is installed inside the fastening screw hole, and the end of the fastening bolt passes through the rear of the mounting groove and is threadedly connected to the inner side of the fastening screw hole.

[0012] Preferably, the material guide ring frame is fixedly mounted on the front end of the ring frame support arm, and the rear end of the ring frame support arm is fixedly mounted with an adjustment seat, and the limiting bolt passes through the adjustment seat and is threadedly connected to the inner side of the screw hole set on the side of the presser foot support.

[0013] Preferably, hemispherical protrusions are evenly fixed on the side of the adjusting seat in a circular shape, and limiting grooves are provided on the side of the presser foot support. After tightening and installation, the hemispherical protrusions are engaged with the limiting grooves.

[0014] Compared with the prior art, the above technical solution adopted by the present invention has the following technical effects:

[0015] The presser foot cylinder adopts a detachable presser foot head seat structure, and the functional presser foot is installed at the lower part of the presser foot support by means of a slotted fastening structure. The functional presser foot is compact and easy to replace. Different functional presser feet can be replaced according to processing requirements during use, so that the device can meet the processing requirements of different types of work. In addition, a frame-type guide assembly is provided on the side of the presser foot support, and the guide ring frame is connected and installed by means of a ring frame support arm. The installation is convenient and the adjustment is flexible. The lower part of the guide ring frame is provided with an arc protrusion, which can guide and support the strips entering the material forming hole through the guide ring frame without manual arrangement. While ensuring the smooth entry of the strips, the deviation of the strips can be avoided, the quality of the finished product after sewing can be improved, and the working stability of the device can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a schematic diagram of the overall front three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall rear three-dimensional structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the front structure of the functional presser foot of the present invention;

[0020] Figure 4 This is a schematic diagram of the rear structure of the functional presser foot of the present invention;

[0021] Figure 5 This is a schematic diagram of the guide assembly installation structure of the present utility model.

[0022] Explanation of the accompanying symbols: 1. Presser foot support; 2. Functional presser foot; 3. Mounting slot; 4. Connecting protrusion; 5. Fastening bolt; 6. Core rope through hole; 7. Material wrapping forming hole; 8. Bottom through slot; 9. Discharge slot hole; 10. Material guide ring frame; 11. Ring frame support arm; 12. Limit bolt; 13. Adjustment swivel seat; 14. Limit groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application. Example

[0025] See also Figures 1-5 The utility model provides a technical solution: a double-blind thread presser foot cylinder for a sewing machine, comprising a presser foot support 1 and a functional presser foot 2, both of which are made of metal, and the presser foot support 1 is used for the installation and support of the functional presser foot 2, as shown in the attached figure. Figure 1 As shown, in order to facilitate the connection and installation of the presser foot support 1, a mounting slot 3 is opened on the upper part of the presser foot support 1, and the mounting slot 3 is aligned with the mounting slot block on the upper part of the sewing machine. The presser foot support 1 is fixed to the upper part of the sewing machine through the mounting slot 3 and bolts.

[0026] In order to facilitate the connection and installation of the functional presser foot 2, as shown in the attached Figure 3 As shown, a mounting groove is provided at the lower part of the presser foot support 1, and a connecting protrusion 4 is fixedly installed on the top of the functional presser foot 2. The connecting protrusion 4 is mounted in alignment with the inner side of the mounting groove. The functional presser foot 2 can be detachably mounted on the lower part of the presser foot support 1. The functional presser foot 2 is mounted on the lower part of the presser foot support 1 by utilizing the notch engaging and fastening structure. The functional presser foot 2 is compact and easy to replace. Different functional presser feet 2 can be replaced according to processing requirements during use, so that the device can meet the processing requirements of different types of work. In order to fasten and install the functional presser foot 2, as shown in the attached figure, Figure 4 As shown, a fastening screw hole is provided at the rear of the connecting protrusion 4, and a fastening bolt 5 is installed inside the fastening screw hole. The end of the fastening bolt 5 passes through the rear of the mounting groove and is threadedly connected to the inner side of the fastening screw hole.

[0027] In order to carry out the bagging and sewing, a core rope perforation 6 is provided at the front of the functional presser foot 2. Figure 3As shown, a core rope perforation 6 is opened in the middle of the front side of the functional presser foot 2 for the insertion and installation of the core rope. In order to facilitate the curling and forming of the decorative strip, a material wrapping and forming hole 7 is provided in the upper part of the functional presser foot 2. The material wrapping and forming hole 7 runs through the upper part of the functional presser foot 2 and forms a bottom through groove 8 in the lower part of the functional presser foot 2. In order to facilitate the forming of the strip, a T-shaped forming block is arranged inside the material wrapping and forming hole 7. In order to facilitate the discharge of the strip after sewing, as shown in the appendix Figure 4 As shown, a discharge slot hole 9 is arranged at the rear part of the functional presser foot 2. Both the core rope perforation 6 and the discharge slot hole 9 are communicated with the material wrapping and forming hole 7.

[0028] A guiding component for guiding, supporting and conveying the decorative strip is arranged on the side of the presser foot support 1. The guiding component includes a guide material ring frame 10, a ring frame support arm 11 and a limiting bolt column 12. As shown in the appendix Figure 5 As shown, the guide material ring frame 10 is fixedly installed at the front end of the ring frame support arm 11. In order to facilitate the guiding and supporting of the strip, an arc-shaped protrusion is arranged at the lower part of the inner frame of the guide material ring frame 10. The arrangement of the arc-shaped protrusion can prevent the strip from shifting and facilitate the subsequent forming operation. The strip entering the material wrapping and forming hole 7 can be guided and supported by the guide material ring frame 10 without manual arrangement. While ensuring the smooth entry of the strip, it can prevent the strip from shifting, improve the quality of the sewn product, and greatly improve the working stability of the device.

[0029] In order to install and support the ring frame support arm 11, as shown in the appendix Figure 5 As shown, an adjusting rotating seat 13 is fixedly installed at the rear end of the ring frame support arm 11. The limiting bolt column 12 passes through the adjusting rotating seat 13 and is threadedly connected to the inner side of a screw hole arranged on the side of the presser foot support 1. The ring frame support arm 11 is rotationally and limitedly installed on the side of the presser foot support 1 through the limiting bolt column 12. By flipping the ring frame support arm 11, the support position and height of the guide material ring frame 10 can be controlled and adjusted. In order to lock and limit the adjusted ring frame support arm 11, hemispherical protrusions are uniformly fixed in a circumferential shape on the side of the adjusting rotating seat 13. A limiting groove 14 is arranged on the side of the presser foot support 1. After being firmly installed, the hemispherical protrusions are engaged and connected with the limiting groove 14, and the locking and limiting of the ring frame support arm 11 can be realized.

[0030] Working principle or structural principle: During use, select and install a functional presser foot 2 with a suitable specification according to the size of the roll wrapping type. During installation, only align and insert the connecting convex block 4 into the inner side of the installation slot at the lower part of the presser foot support 1, and then complete the locking installation of the functional presser foot 2 through the tightening installation of the fastening bolt 5. Similarly, after simply loosening and removing the fastening bolt 5, the disassembly operation of the functional presser foot 2 can be completed by simply pushing forward. After completion, the presser foot support 1 is installed on the upper part of the sewing machine through the installation slot 3 and bolt tightening and limiting, and the installation operation of the presser foot cylinder is completed;

[0031] During operation, lay the decorative strip flat through the material guiding ring frame 10, and then pass the ends of the decorative strip through the material wrapping and forming holes 7 and the discharge slot holes 9 in sequence. The T-shaped forming block in the material wrapping and forming hole 7 completes the guiding and pressing forming of the decorative strip. At the same time, pass the core rope through the core rope perforation 6 and the discharge slot hole 9 in sequence, so that the core rope is clamped inside the formed decorative strip. Then place the bottom fabric under the functional presser foot 2 and lower the presser foot to pull and flatten the decorative strip passing through the material guiding ring frame 10 to complete the preliminary installation of the strip. Then, use a double needle to sew and process the clamped decorative strip from both sides of the rear of the material wrapping and forming hole 7. During the processing, the sewn material piece is discharged from the discharge slot hole 9, and at the same time, the front decorative strip stably enters the material wrapping and forming hole 7 under the guiding and supporting of the material guiding ring frame 10, and the processing is completed in this cycle.

[0032] In summary, this presser foot cylinder adopts a detachable presser foot head seat structure. The functional presser foot 2 is installed at the lower part of the presser foot support 1 by using a notch fitting and fastening structure. The functional presser foot 2 is small in size and convenient to replace. During use, different functional presser feet 2 can be replaced according to the processing requirements, so that the device can meet the processing requirements of different types of work. And a frame-type guiding component is arranged on the side of the presser foot support 1. The material guiding ring frame 10 is connected and installed by using the ring frame support arm 11. The installation is convenient and the adjustment is flexible. An arc protrusion is arranged at the lower part of the material guiding ring frame 10. The material guiding ring frame 10 can guide and support the strip entering the material wrapping and forming hole 7, without manual arrangement. While ensuring the smooth entry of the strip, it can avoid the deviation of the strip, improve the quality of the sewn finished product, and greatly improve the working stability of the device.

[0033] Those skilled in the art can understand that the features recited in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly recited in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features recited in the various embodiments and / or claims of the present invention can be combined and combined in various ways. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A double-hidden-thread presser foot cylinder for a sewing machine, comprising a presser foot support (1) and a functional presser foot (2), characterized in that: The functional presser foot (2) is detachably installed at the lower part of the presser foot support (1). A core cord perforation (6) is provided at the front part of the functional presser foot (2), and a material wrapping forming hole (7) is provided at the upper part of the functional presser foot (2). A guiding assembly for guiding and supporting the conveying of decorative strips is provided on the side of the presser foot support (1). The guiding assembly includes a material guiding ring frame (10), a ring frame support arm (11) and a limiting bolt post (12). The ring frame support arm (11) is rotationally and limitably installed on the side of the presser foot support (1) through the limiting bolt post (12). The material guiding ring frame (10) is installed at the front part of the ring frame support arm (11), and an arc-shaped protrusion is provided at the lower part of the inner frame of the material guiding ring frame (10).

2. The double-hidden-thread presser foot cylinder of a sewing machine according to claim 1, wherein: An installation notch (3) is provided at the upper part of the presser foot support (1). The installation notch (3) is in alignment and engagement with the installation slot block at the upper part of the sewing machine. The presser foot support (1) is fixedly installed at the upper part of the sewing machine through the installation notch (3) and bolts.

3. A double hidden thread presser foot cylinder of a sewing machine according to claim 1, characterized in that: The core cord perforation (6) is provided in the middle of the front side of the functional presser foot (2). The material wrapping forming hole (7) penetrates through the upper part of the functional presser foot (2) to form a bottom through groove (8) at the lower part of the functional presser foot (2). A T-shaped forming block is provided inside the material wrapping forming hole (7). A discharge slot hole (9) is provided at the rear part of the functional presser foot (2). Both the core cord perforation (6) and the discharge slot hole (9) are communicated with the material wrapping forming hole (7).

4. The double-hidden-thread presser foot cylinder of a sewing machine according to claim 3, wherein: An installation embedding groove is provided at the lower part of the presser foot support (1). A connecting convex block (4) is fixedly installed at the top of the functional presser foot (2). The connecting convex block (4) is in alignment and engagement with the inner side of the installation embedding groove.

5. A double-blind stitch presser foot cylinder for a sewing machine according to claim 4, characterized in that: A fastening screw hole is provided at the rear part of the connecting convex block (4). A fastening bolt (5) is installed inside the fastening screw hole. The end of the fastening bolt (5) penetrates through the rear part of the installation embedding groove and is threadedly connected to the inner side of the fastening screw hole.

6. The double-hidden-thread presser foot cylinder of a sewing machine according to claim 1, wherein: The material guiding ring frame (10) is fixedly installed at the front end of the ring frame support arm (11). An adjusting rotating seat (13) is fixedly installed at the rear end of the ring frame support arm (11). The limiting bolt post (12) penetrates through the adjusting rotating seat (13) and is threadedly connected to the inner side of the screw hole provided on the side of the presser foot support (1).

7. The double-blind stitch presser foot cylinder of a sewing machine according to claim 6, characterized in that: Hemispherical convex blocks are uniformly fixed in a circumferential shape on the side of the adjusting rotating seat (13). A limiting groove (14) is provided on the side of the presser foot support (1). After being tightly installed, the hemispherical convex blocks are in engagement connection with the limiting groove (14).

Images