An extended cylinder sewing machine

Abstract

The utility model discloses a kind of lengthening cylinder type sewing machines, comprising: feeding mechanism, push the cloth to be processed to the needle hole position of sewing machine moves;Thread cutting mechanism, cut the excess thread on cloth;Open frame mechanism, wear on cylindrical cloth and open it, so that its side wall is in tension state;The table extension of sewing machine to process the cylindrical part of cloth, feeding mechanism, thread cutting mechanism and open frame mechanism are respectively arranged on the table of sewing machine;When open frame mechanism opens cloth, thread cutting mechanism synchronously moves and cuts the thread on cloth;The present application can conveniently process cylindrical cloth.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, and in particular relates to an extended tube sewing machine. Background Technology

[0002] Extended tubular sewing machines are specialized equipment for sewing cylindrical fabrics (such as garment sleeves, trouser legs, and collars; home textile tubular covers and dust covers; and industrial tubular filter cloths). The core processing requirements for these fabrics are smooth and taut cylindrical sidewalls, continuous and even stitches, and timely removal of thread ends. The cylindrical fabric must maintain its hollow tubular shape during sewing to avoid sidewall wrinkles and misalignment that could lead to skewed stitches. Simultaneously, in mass production scenarios (such as garment factories and home textile production lines), processing efficiency must be considered, avoiding excessive manual intervention steps that could impact production capacity. Existing ordinary sewing machines or traditional tubular sewing machines are structurally unsuitable for the specific processing requirements of cylindrical fabrics, exhibiting several significant shortcomings. Firstly, the tables of existing sewing machines are mostly of standard length (suitable only for flat fabrics or small tubular fabrics), and cannot support longer cylindrical fabrics (such as adult long sleeves or industrial long-tube filter cloths). During processing, the cylindrical part hangs over the outside of the table, and the lack of effective support leads to uneven stress on the fabric. During sewing, the cylinder wall is prone to shifting and twisting, the stitches are wavy, and even faults such as skipped stitches and broken needles may occur. For cylindrical fabrics with larger diameters, the hanging part will also cause the seams to misalign due to gravity, resulting in a significant decrease in the finished product qualification rate. Secondly, existing processing methods mostly rely on manual hand-held or simple supports to stretch cylindrical fabrics: when stretching manually, it is difficult to maintain uniform force, and the cylinder wall is prone to local loosening or overstretching. After sewing, the fabric rebounds, causing the stitches to deform. Simple supports are mostly of fixed size and cannot be adapted to cylindrical fabrics of different diameters and lengths. Moreover, after stretching, the cylinder wall cannot be fully tightened, and there is still a risk of wrinkles. Especially in delicate processes such as sewing cylinder wall splicing and decorative lines, wrinkles will directly affect the processing accuracy. Third, the thread-cutting mechanisms of existing sewing machines are mostly designed with a fixed position or require manual triggering for thread cutting: when processing cylindrical fabrics, after the fabric is stretched out, sewing must be completed first, and then the fabric must be manually moved to the thread-cutting position, or the machine must be stopped to manually cut the thread ends, resulting in a disconnect in the process and extending the processing time of a single piece by more than 30%; although some equipment has an automatic thread-cutting function, the thread-cutting mechanism cannot move synchronously with the position of the stretched fabric, which easily leads to deviation in the thread-cutting position, and the residual thread ends are too long (≥3mm), requiring secondary trimming, increasing labor costs, and cannot adapt to the circular sewing trajectory of cylindrical fabrics. Fourth, existing feeding mechanisms are mostly designed for flat fabrics, and the biting method and transmission rhythm of the feeding teeth cannot match the cylindrical wall under tension: during sewing, the feeding teeth are prone to slipping on the cylinder wall, or the cylinder wall may fray or break due to excessive biting force; for thicker cylindrical fabrics (such as denim trouser legs and canvas sleeves), the feeding mechanism is not powerful enough to smoothly push the fabric to move, resulting in uneven stitch spacing, or even needle breakage caused by the fabric stopping. Fifth, the feeding, thread cutting, and stretching functions of existing equipment are mostly designed independently and lack integrated layout: during processing, one person needs to operate the sewing machine while another person assists in stretching the fabric, adjusting its position, and triggering thread cutting, resulting in high labor costs; moreover, the actions of each mechanism lack linkage control, which easily leads to coordination errors such as feeding the material before it is fully stretched or fabric shifting when cutting the thread. Especially in mass production scenarios, coordination errors will accumulate and lead to poor product consistency, making it difficult to meet the needs of large-scale processing. Utility Model Content

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] In order to overcome the problem of inconvenience in processing cylindrical fabrics by existing sewing machines, this utility model provides an extended cylindrical sewing machine.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an extended tube sewing machine, comprising: The feeding mechanism pushes the fabric to be processed toward the needle hole position of the sewing machine; The thread-cutting mechanism cuts off excess threads from the fabric. The support frame mechanism is threaded onto the cylindrical fabric and spreads it open, so that its sidewalls are in a taut state; The sewing machine table extends to process the cylindrical part of the fabric, and the feeding mechanism, thread cutting mechanism and stretching frame mechanism are respectively located on the sewing machine table. When the spreading mechanism spreads the fabric, the thread cutting mechanism moves simultaneously to cut the threads on the fabric.

[0006] Furthermore, the feeding mechanism includes: The feed dog is located on the sewing machine table; A toother frame is used to install feeding teeth; The jaw support and lifting fork are respectively located at both ends of the jaw support; The lifting drive shaft and the feeding drive shaft are respectively mounted on the tooth holder seat and the lifting fork. The support block is provided with through holes for the tooth lifting drive shaft and the feeding drive shaft to pass through; The tooth holder, tooth lifting fork, and support block are fixed to the bottom of the table.

[0007] Furthermore, the feeding mechanism also includes: Two lifting feed shafts are installed on the sewing machine; Two sets of reversing connection components are used to connect the tooth lifting feed shaft and the tooth lifting drive shaft or the tooth lifting feed shaft and the feed drive shaft.

[0008] Furthermore, the commutation connection component includes: The first tooth-lifting conversion crank is sleeved on the tooth-lifting feed shaft; The second tooth-lifting conversion crank is sleeved on the tooth-lifting drive shaft or the feeding drive shaft; The tooth-lifting conversion linkage is used to connect the first tooth-lifting conversion crank and the second tooth-lifting conversion crank; The distance between the two lifting feed shafts is greater than the distance between the lifting drive shaft and the feeding drive shaft.

[0009] Furthermore, the wire-cutting mechanism includes: The fixed cutter is attached to the lower part of the feed tooth; A single-moving blade moves relative to a stationary blade to cut the thread end; A stepper motor drives a single-moving blade to move and perform the wire-cutting action; The transmission assembly transmits the power of the stepper motor to the single-acting blade; The sewing machine is equipped with a motor bracket, and the stepper motor is mounted on the motor bracket.

[0010] Furthermore, the transmission components include: The wire-cutting drive linkage is connected to the output shaft of the stepper motor; The first wire-cutting drive crank is connected to one end of the wire-cutting transmission connecting rod; The second wire-cutting drive crank is connected to the first wire-cutting drive crank via a first wire-cutting connecting shaft; The single-action tool holder is connected to the second shearing line drive crank via a second shearing line connecting shaft. The sewing machine is equipped with a lower shaft, on which the first thread-cutting drive crank, the second thread-cutting drive crank, and the single-action blade holder are respectively mounted.

[0011] Furthermore, the support frame mechanism includes: Two first guide tubes are located on the sewing machine table; The second guide tube is located below the sewing machine table. The output shaft of the stepper motor and the second guide tube form a transmission connection.

[0012] Furthermore, the sewing machine table has grooves on both sides, the first guide tube is located in the grooves, and guide tube seats are provided at both ends of the first guide tube.

[0013] Furthermore, the output shaft of the stepper motor is provided with a support frame pulley seat. One end of the support frame pulley seat is connected to the wire cutting transmission link, and the other end is connected to the support frame link. One end of the support frame link is connected to the guide tube link, and the second guide tube is connected to the guide tube link. The middle part of the guide tube link is rotatably connected to the motor bracket.

[0014] The advantages of this utility model are: The sewing machine table extension design can fully support long and large diameter cylindrical fabrics (such as adult long sleeves and industrial long filter cloths), replacing the problem of fabric drooping caused by the existing table being too short: the cylindrical part of the fabric fits the table throughout the process, avoiding the deviation and twisting of the cylinder wall caused by gravity pulling, and the straightness error of the stitch is ≤0.1mm, completely eliminating defects such as wavy stitches, skipped stitches, and broken needles; at the same time, the table support makes the seam alignment more precise, increasing the finished product qualification rate by more than 40%, and is suitable for processing all sizes of cylindrical fabrics, from small garment parts (collars, cuffs) to large industrial parts (cylindrical filter cloths, canvas sleeves). The stretching frame mechanism can thread and stretch cylindrical fabrics, replacing manual hand-held or simple supports: the stretching force is uniform and controllable, avoiding local slack or excessive stretching, keeping the cylinder wall in a flat and taut state throughout, eliminating the risk of wrinkles, and is especially suitable for delicate processes such as cylinder wall splicing and decorative lines, significantly improving processing accuracy; moreover, the stretching frame can be adapted to cylindrical fabrics of different diameters and lengths without the need to change special components, solving the problem of poor adaptability of existing fixed-size supports, and is compatible with various materials such as elastic knitted fabrics and heavy canvas, preventing the fabric from springing back and deforming after sewing.

[0015] When the fabric is spread out by the stretching mechanism, the thread-cutting mechanism moves synchronously to cut the thread, replacing the existing design that requires disconnected processes and manual triggering: no need to stop the machine or manually transfer the fabric, the processing time per piece is reduced by more than 30%, and the tedious process of sewing-shifting-thread-cutting is completely eliminated; the thread-cutting mechanism moves synchronously with the position of the fabric, accurately adapting to the circular sewing trajectory of cylindrical fabric, with a residual thread length of ≤1mm, eliminating the need for secondary trimming, reducing labor costs, and perfectly solving the pain points of existing thread-cutting position deviation and excessively long thread ends. The integrated feeding mechanism has been upgraded for improved adaptability, eliminating transmission jams and fabric damage. The feeding mechanism, along with the support frame and thread cutting mechanism, is designed in a coordinated manner and optimized for the tensioned cylindrical wall. The feeding teeth's biting method and transmission rhythm are precisely matched to the characteristics of the cylindrical wall, avoiding slippage or excessive biting that could cause pilling or damage. For thick materials (denim trouser legs, canvas sleeves), the feeding power is sufficient to smoothly push the fabric forward. The stitch spacing uniformity error is ≤0.2mm, eliminating the risk of needle breakage due to stagnation. It is suitable for processing cylindrical fabrics of various materials, from thin knitted fabrics to heavy canvas. The feeding, thread cutting, and stretching mechanisms are integrated on the table and move in tandem, replacing the existing independent design and manual assistance mode: a single person can complete the entire process of stretching, feeding, sewing, and thread cutting without additional personnel, reducing labor costs by 50%; the linkage control of each mechanism avoids coordination errors such as feeding before stretching is in place or fabric shifting during thread cutting, greatly improving product consistency during mass production and meeting the large-scale processing needs of garment factories, home textile production lines, etc. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the structure of an extended tube sewing machine according to one embodiment of the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the feeding mechanism of the extended tube sewing machine in the illustrated embodiment.

[0020] Figure 3 for Figure 1 A schematic diagram of the thread-cutting mechanism of the extended tube sewing machine in the illustrated embodiment.

[0021] Figure 4 for Figure 1 A schematic diagram of the support frame mechanism of the extended tube sewing machine in the illustrated embodiment.

[0022] The meanings of the reference numerals in the figure are as follows: 100. Feeding mechanism; 101. Feeding tooth; 102. Tooth holder; 103. Tooth holder seat; 104. Tooth lifting fork; 105. Tooth lifting pin; 106. Tooth lifting drive shaft; 107. Feeding drive shaft; 108. Tooth lifting feeding shaft; 109. First tooth lifting conversion crank; 110. Second tooth lifting conversion crank; 111. Tooth lifting conversion connecting rod; 200. Wire cutting mechanism; 201. Fixed blade; 202. Single blade; 203. Stepper motor; 204. First wire cutting drive crank 205. Handle; 206. Second thread-cutting drive crank; 207. Single-action blade holder; 208. First thread-cutting connecting shaft; 209. Second thread-cutting connecting shaft; 300. Thread-cutting transmission link; 301. Spreading frame mechanism; 302. Spreading frame pulley seat; 303. First guide tube; 304. Second guide tube; 305. Guide tube seat; 306. Spreading frame link; 407. Guide tube link; 408. Sewing machine; 401. Table; 402. Lower shaft; 403. Motor bracket. Detailed Implementation

[0023] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0024] It should also be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0025] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0026] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0028] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1-4As shown, an extended cylindrical sewing machine 400 includes a feeding mechanism 100, a thread-cutting mechanism 200, and a stretching frame mechanism 300. The feeding mechanism 100 pushes the fabric to be processed toward the needle hole position of the sewing machine 400. The thread-cutting mechanism 200 cuts off excess thread ends on the fabric. The stretching frame mechanism 300 is inserted into the cylindrical fabric and stretches it open, so that its sidewalls are in a taut state. The table 401 of the sewing machine 400 extends to process the cylindrical part of the fabric. The feeding mechanism 100, the thread-cutting mechanism 200, and the stretching frame mechanism 300 are respectively disposed on the table 401 of the sewing machine 400. When the stretching frame mechanism 300 stretches the fabric, the thread-cutting mechanism 200 moves synchronously to cut off the thread ends on the fabric. In practical use, the operator simply places the cylindrical fabric onto the stretching frame mechanism 300, starts the sewing machine 400, and the feeding mechanism 100 automatically feeds the fabric to the needle hole for sewing. During the sewing process, the stretching frame mechanism 300 continuously maintains the fabric tension to prevent wrinkles and misalignment. Once sewing is complete, as the stretching frame mechanism 300 expands the fabric, the thread-cutting mechanism 200 moves synchronously and accurately cuts off excess thread ends. The entire process is seamless, greatly improving processing efficiency and product quality.

[0030] Specifically, such as Figure 2 As shown, the feeding mechanism 100 includes a feeding tooth 101, a tooth holder 102, a tooth holder 102 seat, a tooth lifting fork 104, a tooth lifting drive shaft 106, a feeding drive shaft 107, a support block, a chain, each tooth lifting and feeding shaft 108, and two sets of reversing connection assemblies.

[0031] The feed dog 101 is located on the table 401 of the sewing machine 400; the feed dog holder 102 is used to install the feed dog 101; the feed dog holder 102 base and the feed dog lifting fork 104 are respectively located at both ends of the feed dog holder 102, and the feed dog lifting fork 104 is connected to the feed dog holder 102 base through the feed dog lifting pin 105; the feed dog lifting drive shaft 106 and the feed drive shaft 107 are respectively passed through the feed dog holder 102 base and the feed dog lifting fork 104; the support block is provided with through holes for the feed dog lifting drive shaft 106 and the feed drive shaft 107 to pass through; the feed dog holder 102 base, the feed dog lifting fork 104 and the support block are fixedly connected to the bottom of the table 401; two feed dog lifting shafts 108 are located on the sewing machine 400; two sets of reversing connection components are used to connect the feed dog lifting shaft 108 and the feed dog lifting drive shaft 106 or the feed dog lifting shaft 108 and the feed drive shaft 107. The tooth holder 102, the tooth lifting fork 104, and the support block provide support for both ends of the tooth lifting drive shaft 106 and the feeding drive shaft 107, thereby enhancing the stability of the feeding tooth 101 and ensuring that the feeding tooth 101 will not sink under pressure during the feeding process, which is a problem in some designs where the shaft cantilever is too long and affects the feeding effect.

[0032] The reversing connection assembly includes a first lifting reversing crank, a second lifting reversing crank, and a lifting conversion link 111. A first lifting conversion crank 109 is sleeved on the lifting feed shaft 108; a second lifting conversion crank 110 is sleeved on the lifting drive shaft 106 or the feeding drive shaft 107; the lifting conversion link 111 connects the first lifting conversion crank 109 and the second lifting conversion crank 110. The distance between the two lifting feed shafts 108 is greater than the distance between the lifting drive shaft 106 and the feeding drive shaft 107. This design allows the power of the lifting feed shaft 108 to be effectively transmitted to the lifting drive shaft 106 and the feeding drive shaft 107, while avoiding interference between the shafts. During the power transmission process, the first tooth lifting conversion crank 109 rotates along with the tooth lifting feed shaft 108, and drives the second tooth lifting conversion crank 110 to rotate through the tooth lifting conversion connecting rod 111, which in turn drives the tooth lifting transmission shaft 106 or the feed transmission shaft 107 to rotate, thereby realizing the tooth lifting and feeding action of the feed tooth 101.

[0033] Furthermore, such as Figure 3 As shown, the thread-cutting mechanism 200 includes a fixed blade 201, a single-moving blade, a stepper motor 203, and a transmission assembly. The fixed blade 201 is fixedly connected to the lower part of the feed tooth 101. The single-moving blade moves relative to the fixed blade 201 to cut the thread end. The stepper motor 203 drives the single-moving blade to move to achieve the thread-cutting action. The transmission assembly transmits the power of the stepper motor 203 to the single-moving blade. The sewing machine 400 is equipped with a motor bracket 403, on which the stepper motor 203 is mounted. To ensure the maximum bobbin length, the stepper motor 203 is mounted on the lower right side of the base plate.

[0034] The transmission assembly includes a wire-cutting drive linkage 209, a first wire-cutting drive crank 204, a second wire-cutting drive crank 205, and a single-action blade holder 206. The wire-cutting drive linkage 209 is connected to the output shaft of a stepper motor 203. When the stepper motor 203 starts, the output shaft rotates, which in turn drives the wire-cutting drive linkage 209. The first wire-cutting drive crank 204 is connected to one end of the wire-cutting drive linkage 209, and the movement of the wire-cutting drive linkage 209 drives the first wire-cutting drive crank 204 to rotate. The second wire-cutting drive crank 205 is connected to the first wire-cutting drive crank 204 via a first wire-cutting connecting shaft 207. The rotation of the first wire-cutting drive crank 204 is transmitted to the second wire-cutting drive crank 205 through the first wire-cutting connecting shaft 207. The single-action cutter holder 206 is connected to the second thread-cutting drive crank 205 via a second thread-cutting connecting shaft 208. The rotation of the second thread-cutting drive crank 205 is transmitted to the single-action cutter holder 206 via the second thread-cutting connecting shaft 208, thereby driving the single-action cutter to move relative to the fixed cutter 201, thus achieving the action of cutting the thread end. The sewing machine 400 is provided with a lower shaft 402. The first thread-cutting drive crank 204, the second thread-cutting drive crank 205, and the single-action cutter holder 206 are respectively sleeved on the lower shaft 402. The lower shaft 402 provides stable support and a rotational base for these components, ensuring the smooth operation of the thread-cutting action.

[0035] The thread cutter and the stepper motor 203 are connected only by the conversion crank and the thread cutting connecting shaft, which ensures the minimum circumference of the cylinder; both conversion cranks are mounted on the original lower shaft 402 of the sewing machine 400, with fewer parts, simple structure and small space occupation.

[0036] Furthermore, such as Figure 4 As shown, the support frame mechanism 300 includes first guide tubes 302 and second guide tubes 303. The two first guide tubes 302 are located on the table 401 of the sewing machine 400; the second guide tubes 303 are located below the table 401 of the sewing machine 400; the output shaft of the stepper motor 203 forms a transmission connection with the second guide tubes 303. Grooves are provided on both sides of the table 401 of the sewing machine 400, and the first guide tubes 302 are located within the grooves. Guide tube seats 304 are provided at both ends of the first guide tubes 302.

[0037] The output shaft of the stepper motor 203 is equipped with a support frame pulley seat 301. One end of the support frame pulley seat 301 is connected to the wire shearing transmission connecting rod 209, and the other end is connected to the support frame connecting rod 305. One end of the support frame connecting rod 305 is connected to a guide tube connecting rod 306. The second guide tube 303 is connected to the guide tube connecting rod 306, and the middle part of the guide tube connecting rod 306 is rotatably connected to the motor bracket 403. The integrated roller is mounted on the base plate, which makes the roller diameter smaller and more stable.

[0038] When the stepper motor 203 is working, the rotation of its output shaft drives the second guide tube 303 to perform corresponding actions, thereby realizing the opening operation of the cylindrical fabric. When the stepper motor 203 rotates, the opening frame pulley seat 301 rotates accordingly. Since one end of the opening frame pulley seat 301 is connected to the wire cutting transmission link 209 and the other end is connected to the opening frame link 305, the opening frame link 305 will move under the drive of the opening frame pulley seat 301. The guide tube link 306 connected to one end of the opening frame link 305 will also move accordingly. The second guide tube 303 is connected to the guide tube link 306, and the middle of the guide tube link 306 is rotatably connected to the motor bracket 403. This allows the second guide tube 303 to move along a specific trajectory, thereby threading and opening the cylindrical fabric.

[0039] In actual sewing, the feeding mechanism 100, the thread-cutting mechanism 200, and the stretching mechanism 300 work closely together to form a highly efficient working system. The feeding mechanism 100 continuously and stably feeds the fabric to the needle hole position, the stretching mechanism 300 ensures that the fabric is always in a flat and taut state, and the thread-cutting mechanism 200 accurately cuts the thread ends at the appropriate time. This collaborative working mode not only improves sewing efficiency but also greatly enhances sewing quality.

[0040] The extended tube sewing machine 400 demonstrates excellent adaptability to cylindrical fabrics of varying materials and sizes. For thin knitted fabrics, the feed mechanism 100 gently guides the fabric, preventing damage; for heavy canvas, the feed mechanism 100 provides ample power to ensure smooth movement. The stretching mechanism 300 can be flexibly adjusted according to the diameter and length of the fabric, adapting to various sizes of cylindrical fabrics without requiring the replacement of specialized components.

[0041] Currently, conventional sewing machines (400mm) and stretchers are designed separately and assembled together during use. This results in an excessively long circumference for the combined cylindrical portion of the sewing machine (400mm) and the rollers of the stretcher, which is insufficient for small-diameter garment manufacturing processes. This invention addresses this issue by incorporating two fixed rollers mounted on the sewing machine (400mm) base plate and one stretcher roller installed below the base plate. The stretching circumference is adjusted by rotating a stepper motor (203). Additionally, a fixed roller can be added to the far end of the base plate to accommodate larger-diameter garment manufacturing processes.

[0042] The stroke of the stretching roller is adjusted by a stepper motor 203, and the length can be set arbitrarily within a certain range, making adjustment extremely convenient and suitable for garments of different sizes. Both stretching and retraction can be automatically completed through program settings, reducing manual operation. The amount of stretching is achieved by the rotation of the stepper motor 203, resulting in a longer service life compared to traditional products that rely on cylinder extension and component limiters. Both the wire cutting mechanism 200 and the support frame mechanism 300 are controlled by the same stepper motor 203, resulting in fewer parts, lower cost, and stable quality. Through size optimization, a win-win design is achieved, utilizing the idle stroke of the wire cutting blade to adjust the stroke of the support frame, while simultaneously utilizing the idle stroke of the support frame to adjust the wire cutting stroke. This significantly reduces the number of parts and the difficulty of debugging for these two mechanisms.

[0043] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of this disclosure is not limited to the specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An extended tube-type sewing machine (400), characterized in that: include: The feeding mechanism (100) pushes the fabric to be processed toward the needle hole position of the sewing machine (400); The thread-cutting mechanism (200) cuts off excess threads on the fabric; The support frame mechanism (300) is inserted into the cylindrical fabric and supports it, so that its sidewalls are in a taut state; The table (401) of the sewing machine (400) extends to process the cylindrical part of the fabric, and the feeding mechanism (100), the thread cutting mechanism (200) and the support frame mechanism (300) are respectively provided on the table (401) of the sewing machine (400). When the spreading frame mechanism (300) spreads the fabric, the thread cutting mechanism (200) moves synchronously to cut the thread ends on the fabric.

2. The extended tube sewing machine (400) according to claim 1, characterized in that: The feeding mechanism (100) includes: The feed dog (101) is located on the table (401) of the sewing machine (400); A tooth holder (102) is used to mount the feeding tooth (101); The tooth frame (102) seat and the tooth lifting fork (104) are respectively provided at both ends of the tooth frame (102); The tooth lifting drive shaft (106) and the feeding drive shaft (107) are respectively mounted on the tooth frame (102) seat and the tooth lifting fork (104); The support block is provided with through holes for the tooth lifting drive shaft (106) and the feeding drive shaft (107) to pass through; The tooth rack (102) seat, the tooth lifting fork (104) and the support block are fixedly connected to the bottom of the table (401).

3. The extended tube sewing machine (400) according to claim 2, characterized in that: The feeding mechanism (100) further includes: Two lifting feed shafts (108) are provided on the sewing machine (400); Two sets of reversing connection assemblies are used to connect the tooth lifting feed shaft (108) and the tooth lifting drive shaft (106) or the tooth lifting feed shaft (108) and the feed drive shaft (107).

4. The extended tube sewing machine (400) according to claim 3, characterized in that: The commutation connection component includes: The first tooth lifting conversion crank (109) is sleeved on the tooth lifting feed shaft (108); The second tooth lifting conversion crank (110) is sleeved on the tooth lifting transmission shaft (106) or the feeding transmission shaft (107); The tooth lifting conversion linkage (111) is used to connect the first tooth lifting conversion crank (109) and the second tooth lifting conversion crank (110); The distance between the two lifting feed shafts (108) is greater than the distance between the lifting drive shaft (106) and the feeding drive shaft (107).

5. The extended tube sewing machine (400) according to claim 2, characterized in that: The wire-cutting mechanism (200) includes: A fixed blade (201) is fixedly connected below the feed tooth (101); A single-moving blade moves relative to the fixed blade (201) to cut the wire end; A stepper motor (203) drives the single-acting blade to move and perform the wire-cutting action; The transmission assembly transmits the power of the stepper motor (203) to the single-acting blade; The sewing machine (400) is provided with a motor bracket (403), and the stepper motor (203) is mounted on the motor bracket (403).

6. The extended tube sewing machine (400) according to claim 5, characterized in that: The transmission assembly includes: The wire-cutting transmission link (209) is connected to the output shaft of the stepper motor (203); The first wire-cutting drive crank (204) is connected to one end of the wire-cutting transmission link (209); The second wire-cutting drive crank (205) is connected to the first wire-cutting drive crank (204) via a first wire-cutting connecting shaft (207); The single-action tool holder (206) is connected to the second wire-cutting drive crank (205) via a second wire-cutting connecting shaft (208); The sewing machine (400) is provided with a lower shaft (402), and the first thread cutting drive crank (204), the second thread cutting drive crank (205) and the single-action knife holder (206) are respectively sleeved on the lower shaft (402).

7. The extended tube sewing machine (400) according to claim 6, characterized in that: The support frame mechanism (300) includes: Two first guide tubes (302) are provided on the table (401) of the sewing machine (400); The second guide tube (303) is located below the table (401) of the sewing machine (400); The output shaft of the stepper motor (203) is connected to the second guide tube (303) in a transmission relationship.

8. The extended tube sewing machine (400) according to claim 7, characterized in that: The sewing machine (400) has grooves on both sides of the table (401), the first guide tube (302) is located in the grooves, and guide tube seats (304) are provided at both ends of the first guide tube (302).

9. The extended tube sewing machine (400) according to claim 8, characterized in that: The output shaft of the stepper motor (203) is provided with a support frame pulley seat (301). One end of the support frame pulley seat (301) is connected to the wire cutting transmission link (209), and the other end is connected to the support frame link (305). One end of the support frame link (305) is connected to the guide tube link (306). The second guide tube (303) is connected to the guide tube link (306). The middle part of the guide tube link (306) is rotatably connected to the motor bracket (403).

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