Three-fold folder presser foot for leather fabric welt concealed seam single bag

Abstract

The utility model relates to a garment sewing appliance, in particular to a three-fold folder presser foot for a leather fabric welt concealed seam single bag. The utility model aims to provide a three-fold folder presser foot for a leather fabric welt concealed seam single bag, and the three-fold folder presser foot has an integrated edge covering function and has the characteristics of simple structure and convenience in use. According to the technical scheme, the three-fold folder presser foot for the leather fabric welt concealed seam single bag is characterized in that the three-fold folder presser foot comprises a presser foot assembly and a folder structure which is connected with the presser foot assembly and is horizontally arranged; the presser foot assembly comprises a presser foot fixing block connected with a presser foot rod of the sewing machine and a presser foot connecting frame connected with the presser foot fixing block through a spring assembly.

Description

Technical Field

[0001] This utility model relates to garment sewing tools, specifically a three-fold pull-out presser foot for blind stitching of leather fabric single bags. Background Technology

[0002] In garment production, a technique using leather piping for edge binding is frequently used. This requires a blind-stitched, single-layer, three-fold binding with no visible stitching. This technique involves numerous steps and is quite difficult to execute. Common processing methods include (e.g.) Figure 18 , Figure 19 , Figure 20 (as shown)

[0003] 1. First, attach the right side (smooth side D) of one side A of the leather fabric piping to the area of ​​the body fabric S to be bound, and sew the edge A to the edge of the body fabric with a sewing thread H.

[0004] 2. Apply glue to the reverse side (fabric side M) of the leather piping;

[0005] 3. Then turn the other side B of the leather piping over to wrap the area to be bound on the other side of the body fabric, and make the fabric side M of side B fit the body fabric.

[0006] 4. Stretch the leather piping to expose the seam H where the leather piping connects to the body fabric as much as possible, and sew a seam I close to the seam H to sew edge B to the body fabric.

[0007] 5. Finally, use an ironing process to cover the stitching on edge A of the leather fabric piping.

[0008] Therefore, this process is complex and cumbersome, resulting in low production efficiency and high rework rates, and it also requires a high level of operator skill. Thus, it is essential to design a device to optimize the blind-seam single-layer three-fold process. Utility Model Content

[0009] The purpose of this utility model is to overcome the shortcomings in the above-mentioned background technology and provide a three-fold pull tube presser foot for single-pack leather fabric with blind stitching. This utility model should have the function of integrated edge binding and have the characteristics of simple structure and easy use.

[0010] The technical solution of this utility model is:

[0011] A three-fold pull tube presser foot for blind stitching of leather fabric single bag, characterized in that: the three-fold pull tube presser foot includes a presser foot assembly and a pull tube structure connected to the presser foot assembly and arranged horizontally;

[0012] The presser foot assembly includes a presser foot fixing block that connects to the presser foot bar of a sewing machine and a presser foot connecting bracket that connects to the presser foot fixing block via a spring assembly;

[0013] The length direction of the pull tube structure maintains an angle with the width direction of the presser foot assembly; the rear end of the pull tube structure is arranged at the right end of the presser foot assembly and serves as the outlet of the pull tube structure; the front end of the pull tube structure extends to the right front side of the presser foot and serves as the inlet of the pull tube structure.

[0014] The pull tube structure includes a pull tube with a serpentine frame, a fabric support piece installed at the top of the pull tube and extending to the right, a sewing opening at the rear end of the pull tube, and baffles on the left and right sides of the sewing opening.

[0015] The pull tube includes a bottom plate, a top plate, and a left side baffle to form an edging channel for the first folding of the leather fabric piping; the middle parts of the bottom plate and the top plate are bent upwards to form the right side of the edging channel; the left end of the bottom plate is folded upwards to form the left side baffle, and the upper end of the left side baffle is connected to the top plate to form the left side of the edging channel; the middle of the rear side of the bottom plate is also slotted downwards to form the sewing opening.

[0016] The rear end of the pull tube is an inclined surface, and the inclined surface maintains an angle with the bottom surface of the pull tube; the bottom plate edge, top plate edge, and left side baffle edge of the edge binding channel outlet are all located on the inclined surface, so that the leather fabric strip led out from the pull tube is folded down against the inclined surface and then output through the sewing port, realizing the second fold of the leather fabric strip.

[0017] The baffle extends vertically upward to guide the fabric rollers output from the edge binding channel.

[0018] The spring assembly includes a bolt passing through a through hole in the presser foot fixing block, a nut tightened with the bolt to fix the presser foot connecting bracket to the lower end of the presser foot fixing block, and a telescopic spring that is sleeved on the bolt and whose two ends respectively abut against the presser foot connecting bracket and the presser foot fixing block.

[0019] The left end of the fabric support sheet is vertically aligned with the right edge of the sewing opening; the left edge of the sewing opening is vertically aligned with the right end of the presser foot.

[0020] The upper end of the presser foot fixing block is provided with a connecting groove for connecting with the presser foot rod of the sewing machine.

[0021] The length direction of the fabric support sheet is at an angle to the length direction of the pull tube; the plane of the fabric support sheet is at an angle to the bottom surface of the presser foot.

[0022] The upper front end of the presser foot connecting bracket is provided with a presser foot baffle that extends horizontally backward.

[0023] The pull tube and the supporting cloth sheet, the pull tube and the serpentine frame, the bottom plate and the top plate, and the presser foot connecting frame and the pull tube are all welded with tin solder.

[0024] The fabric support sheet, pull tube and serpentine frame, bottom plate and top plate are all made of stainless steel sheets with raised dots.

[0025] The beneficial effects of this utility model are:

[0026] 1. The original multi-step blind stitch single-cover three-fold process is simplified into an integrated sewing process, which greatly improves the processing efficiency (more than ten times the efficiency compared with the existing process).

[0027] 2. It simplifies the processing steps, reduces the skill requirements for employees, and decreases the amount of rework. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the main structure of an embodiment of this utility model.

[0029] Figure 2 yes Figure 1 A partial cross-sectional view of the middle pressure foot connecting bracket.

[0030] Figure 3 This is a top view of an embodiment of the present invention.

[0031] Figure 4 yes Figure 3 A schematic diagram of the structure with the supporting fabric removed.

[0032] Figure 5 yes Figure 4 AA section view of the middle pull tube.

[0033] Figure 6 yes Figure 4 BB cross-sectional view of the middle pull tube.

[0034] Figure 7 yes Figure 4 A schematic diagram of the W-direction structure of the middle-pull tube.

[0035] Figure 8 This is a schematic diagram showing the path of the leather rollers as they pass through the pull tube during operation.

[0036] Figure 9 This is a schematic diagram of the cross-sectional structure of the leather fabric roller inside the pull tube during operation (first fold).

[0037] Figure 10 This is a schematic diagram of the cross-sectional structure of the leather fabric roller that is pulled out from the pull tube and enters the sewing opening during operation (the leather fabric roller is in the second folded state).

[0038] Figure 11This is one of the top views of the working state of this utility model embodiment (the main body fabric is not inserted).

[0039] Figure 12 This is a top view of the working state of this utility model embodiment (with leather fabric piping and body fabric inserted simultaneously).

[0040] Figure 13 This is one of the schematic diagrams illustrating the working principle of stitching leather piping to the main body fabric.

[0041] Figure 14 This is the second schematic diagram illustrating the working principle of stitching leather piping to the main body fabric.

[0042] Figure 15 This is the third schematic diagram illustrating the working principle of stitching leather piping to the main body fabric.

[0043] Figure 16 yes Figure 11 The FF sectional view (cross-sectional structure of the leather piping).

[0044] Figure 17 yes Figure 12 The cross-sectional view of GG (the cross-sectional structure after the leather piping is sewn to the body fabric).

[0045] Figure 18 This is one of the schematic diagrams illustrating the working principle of the original process.

[0046] Figure 19 This is the second schematic diagram of the working principle of the original process.

[0047] Figure 20 This is the third schematic diagram of the working principle of the original process.

[0048] Figure label:

[0049] Presser foot assembly 1, presser foot fixing block 1.1, presser foot connecting bracket 1.2, presser foot baffle 1.2.1, spring assembly 1.3, nut 1.3.1, telescopic spring 1.3.2, bolt 1.3.3, connecting groove 1.4, serpentine frame 2.1, pull tube 2.2, base plate 2.2.1, top plate 2.2.2, left side baffle 2.2.3, fabric support piece 2.3, baffle 2.4, binding channel 3, sewing opening 4, first needle hole 5.1, second needle hole 5.2, third needle hole 5.3, fourth needle hole 5.4, sewing needle 6. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0051] The direction of fabric movement during operation is towards Figure 1 On the left side.

[0052] like Figure 1 As shown, a three-fold pull tube presser foot for blind stitching of leather single bags includes a presser foot assembly 1 and a pull tube structure. The left side of the pull tube structure is installed on the right side of the presser foot assembly, which is connected to a sewing machine. The length direction of the pull tube structure and the width direction of the presser foot assembly maintain an angle, preferably between 10 and 20 degrees.

[0053] The presser foot assembly includes a presser foot fixing block 1.1, a presser foot connecting bracket 1.2, and a spring assembly 1.3.

[0054] The upper end of the presser foot fixing block is provided with a connecting groove 1.4. The fastening screw on the sewing machine presser foot bar is inserted into and fastened to the connecting groove to fix the presser foot on the presser foot bar.

[0055] like Figure 1 , Figure 3 As shown, the front and rear sides of the presser foot connecting bracket (vertically facing) Figure 1 The front and left sides of the paper are both bent with vertically upward baffles. The upper end of the front baffle is also bent with a horizontally extending presser foot baffle 1.2.1, thus forming a moving groove. The presser foot connecting frame can be positioned at the lower end of the presser foot fixing block by moving left and right through the moving groove.

[0056] like Figure 2 As shown, the spring assembly includes a nut 1.3.1, a telescopic spring 1.3.2, and a bolt 1.3.3. The bolt passes through the through hole on the presser foot fixing block and is then tightened with the nut to fix the presser foot connecting bracket to the lower end of the presser foot fixing block. The telescopic spring is sleeved on the bolt, with its two ends abutting against the baffle on the left side of the presser foot connecting bracket and the left side surface of the lower end of the presser foot fixing block, respectively. When the nut is loosened, the telescopic spring pushes the presser foot connecting bracket to the left; when the nut is tightened, the presser foot connecting bracket compresses the telescopic spring and moves to the right.

[0057] The pull tube structure includes a serpentine frame 2.1, a pull tube 2.2, a fabric support sheet 2.3, and a baffle 2.4.

[0058] The serpentine frame is installed at the front end of the pull tube structure and is used to organize and guide the leather fabric rollers as they enter the pull tube.

[0059] like Figure 1 and Figure 4 As shown, the pull tube includes a bottom plate 2.2.1, a top plate 2.2.2, and a left side baffle 2.2.3. The three are connected to form a front-to-back through edge binding channel 3, which is used for the first folding of the leather fabric piping.

[0060] The shape of the edge binding channel, such asFigure 5 and Figure 6 The cross-sectional views AA and BB of the pull tube are shown. The bottom plate and the top plate are arranged vertically and vertically, and the middle parts of the bottom plate and the top plate bend upwards simultaneously. The gap between the bottom plate and the top plate forms the right side of the edging channel (similar to "n"). The left end of the bottom plate is folded upwards to form the left side baffle. The upper end of the left side baffle extends upwards and then bends towards the top plate and connects with the left side of the top plate. The gap between the left side baffle and the top plate forms the left side of the edging channel. The leather fabric roller enters the pull tube and undergoes the first fold.

[0061] The middle part of the rear of the base plate is also slotted downward to form a sewing opening 4. The outline of the sewing opening is arc-shaped to serve as the working space for the sewing needle. The right end of the presser foot assembly (the end facing the fabric) is aligned vertically with the left edge of the sewing opening. Two symmetrical baffles 2.4 are provided on the left and right sides of the connection between the sewing opening and the base plate of the pull tube. The baffles extend vertically upward and are perpendicular to the inlet and outlet direction of the binding channel, so as to cooperate with the binding channels on both sides of the sewing opening to fold the leather fabric strip output from the binding channel to form a second fold.

[0062] like Figure 7 and Figure 8 As shown, the front end of the pull tube is the input end of the leather fabric piping, and the rear end of the pull tube is the output end of the leather fabric piping, designed as an inclined surface (the bottom edge, top edge, and left side baffle edge of the edging channel outlet are all located on this inclined surface), and this inclined surface maintains an angle with the bottom surface of the pull tube (preferably 45 degrees). Two baffles 2.4 are symmetrically arranged on the left and right sides of the bottom plate of the pull tube at the sewing opening; the baffles extend upwards and are perpendicular to the inlet and outlet direction of the edging channel.

[0063] like Figure 8 As shown, when the leather fabric roller leading out from the pull tube is folded downwards along the inclined surface and then output to the left through the sewing opening, the edge of the leather fabric roller can fold inwards, thereby realizing the second fold of the leather fabric roller; the baffle 2.4 cooperates with the binding channels on both sides of the sewing opening to make the second fold of the leather fabric roller more stable and reliable.

[0064] The leather trim enters the zipper to form the first fold (e.g.) Figure 9 As shown), at this point, the smooth surface D of the leather piping is facing down, and the fabric surface M is facing up; after leaving the binding channel, the leather piping folds vertically downwards into the sewing opening. The side panels 2.4 and the inclined surface of the bottom plate together provide the leather piping with an inward supporting force from both sides, causing the leather piping to fold inwards along the first fold line and the second fold line (as shown). Figure 9 , Figure 10As shown), perform a second fold (as shown). Figure 10 (As shown), the fabric then passes downwards through the sewing opening. After entering the second fold, the main body fabric can be inserted from the sewing opening into the recess in the center of the leather piping, allowing for the next step.

[0065] like Figure 11 As shown, the leather piping is guided into the pull tube by the serpentine frame, then folded a second time through the sewing opening, and then passes to the left under the presser foot. The cross-section of the leather piping under the presser foot at this point is as shown. Figure 16 As shown (the main body fabric is hidden).

[0066] like Figure 12 As shown, after the main body fabric passes through the supporting sheet, it is inserted into the recess in the center of the leather fabric piping (second folded state) through the sewing opening, and then moves forward together with the leather fabric piping under the presser foot. At this time, the cross-section of the leather fabric piping under the presser foot and the main body fabric is as shown. Figure 17 As shown.

[0067] like Figure 13 , Figure 14 , Figure 15 As shown, the leather piping is folded down from top to bottom at the sewing point; this is the sewing position. During sewing, each stitch of the sewing machine needle needs to pass through the first needle hole 5.1, the second needle hole 5.2, and the fourth needle hole 5.4 on the leather piping. The first needle hole 5.1 and the second needle hole 5.2 are inserted into side A of the leather piping (entering and exiting along side A), while the fourth needle hole is inserted into side B of the leather piping. The body fabric needs to pass through the third needle hole 5.3. During sewing, the four sewing needle holes are aligned vertically, and the sewing needle is inserted into each of the four needle holes sequentially to complete one sewing cycle. The sewing effect is as follows: Figure 15 As shown.

[0068] The support fabric is located on the right side of the top plate, and the length direction of the support fabric is at an angle to the length direction of the pull tube, preferably between 15 and 20 degrees. The support fabric extends to the right, and the plane on which the support fabric is located is at an angle to the bottom surface of the presser foot, preferably between 30 and 40 degrees, so as to keep the main body fabric flat before sewing. The rear end of the support fabric is aligned vertically with the rear edge of the sewing opening to facilitate the entry of the main body fabric into the sewing opening. The edges of the support fabric are rounded to avoid damaging the main body fabric.

[0069] Furthermore, the fabric support sheet, pull tube and serpentine frame, bottom plate and top plate are all made of stainless steel sheets with raised dots to keep the fabric clean.

[0070] Furthermore, the stainless steel sheet is pre-fabricated with regularly arranged protrusions (small pits on the back of the stainless steel sheet) to increase friction with the fabric during manufacturing. The protrusions are formed by punching, and the distance between the protrusions is generally 3-5mm.

[0071] Working principle:

[0072] 1. For example Figure 11 As shown, with the fabric side M of the leather piping facing up, pass it through the binding channel via the serpentine frame;

[0073] 2. Press the front end of the leather piping into the sewing opening. With the help of the baffles on both sides of the sewing opening, the leather piping on the front side A forms a double-layer structure, consisting of an inner smooth surface (directly attached to the main fabric) and an outer smooth surface. The inner smooth surface D on the left side A corresponds to the fabric surface M on the right side B. The leather piping at the sewing opening forms a three-fold structure (e.g., Figure 10 (as shown)

[0074] 3. For example Figure 10 and Figure 12 As shown, the main body fabric is sandwiched between the inner smooth surface on the left and the fabric surface on the right through the supporting sheet.

[0075] 4. For example Figure 13 , Figure 14 As shown, the sewing needle passes through the sewing opening to perform one stitch. The sewing thread passes through the first needle hole 5.1, the second needle hole 5.2 on the leather fabric piping A side, the third needle hole 5.3 on the body fabric, and the fourth needle hole 5.4 on the leather fabric piping B side before hooking with the bottom thread. The sewing thread does not pass through the top layer.

[0076] 5. Step 4 is repeated continuously to achieve blind stitching and three-fold binding of the leather fabric piping; the bound body fabric is output to the front of the sewing machine worktable.

[0077] The accompanying drawings provide a complete picture of the preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough understanding of the disclosure of the present invention.

Claims

1. A three-fold pull tube presser foot for leather fabric piping and blind stitching single bags, characterized in that: The three-fold pull tube presser foot includes a presser foot assembly (1) and a pull tube structure connected to the presser foot assembly and arranged horizontally; The presser foot assembly includes a presser foot fixing block (1.1) that connects to the presser foot bar of a sewing machine and a presser foot connecting bracket (1.2) that connects to the presser foot fixing block via a spring assembly (1.3). The length direction of the pull tube structure maintains an angle with the width direction of the presser foot assembly; the rear end of the pull tube structure is arranged at the right end of the presser foot assembly and serves as the outlet of the pull tube structure; the front end of the pull tube structure extends to the right front side of the presser foot and serves as the inlet of the pull tube structure. The pull tube structure includes a pull tube (2.2) with a serpentine frame (2.1), a fabric support piece (2.3) installed at the top of the pull tube and extending to the right, a sewing opening (4) at the rear end of the pull tube, and baffles (2.4) on the left and right sides of the sewing opening. The pull tube includes a bottom plate (2.2.1), a top plate (2.2.2), and a left side baffle (2.2.3) forming the binding channel (3) to achieve the first fold of the leather fabric piping; the middle of the bottom plate and the top plate bend upwards to form the right side of the binding channel; the left end of the bottom plate is folded upwards to form the left side baffle, and the upper end of the left side baffle is connected to the top plate to form the left side of the binding channel; the middle of the rear side of the bottom plate is also slotted downwards to form the sewing opening.

2. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 1, characterized in that: The rear end of the pull tube is an inclined surface, and the inclined surface maintains an angle with the bottom surface of the pull tube; the bottom plate edge, top plate edge, and left side baffle edge of the edge binding channel outlet are all located on the inclined surface, so that the leather fabric strip led out from the pull tube is folded down against the inclined surface and then output through the sewing port, realizing the second fold of the leather fabric strip.

3. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 2, characterized in that: The baffle extends vertically upward to guide the fabric rollers output from the edge binding channel.

4. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 3, characterized in that: The spring assembly includes a bolt (1.3.3) passing through a through hole in the presser foot fixing block, a nut (1.3.1) tightened with the bolt to fix the presser foot connecting frame to the lower end of the presser foot fixing block, and a telescopic spring (1.3.2) sleeved on the bolt and with its two ends abutting against the presser foot connecting frame and the presser foot fixing block respectively.

5. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 4, characterized in that: The left end of the fabric support sheet is vertically aligned with the right edge of the sewing opening; the left edge of the sewing opening is vertically aligned with the right end of the presser foot.

6. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 5, characterized in that: The upper end of the presser foot fixing block is provided with a connecting groove (1.4) for connecting with the presser foot rod of the sewing machine.

7. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 6, characterized in that: The length direction of the fabric support sheet is at an angle to the length direction of the pull tube; the plane of the fabric support sheet is at an angle to the bottom surface of the presser foot.

8. The three-fold pull tube presser foot for leather fabric piping blind stitch single bag according to claim 7, characterized in that: The upper front end of the presser foot connecting bracket is provided with a presser foot baffle that extends horizontally backward (1.2.1).

9. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 8, characterized in that: The pull tube and the supporting cloth sheet, the pull tube and the serpentine frame, the bottom plate and the top plate, and the presser foot connecting frame and the pull tube are all welded with tin solder.

10. The three-fold pull tube presser foot for blind stitching of leather fabric single bags according to claim 9, characterized in that: The fabric support sheet, pull tube and serpentine frame, bottom plate and top plate are all made of stainless steel sheets with raised dots.

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