A hem sewing machine

Abstract

This invention discloses a hem sewing machine, including a machine base, and a sewing machine head, a feeding mechanism, a folding mechanism, a worktable, a moving platform assembly, and a garment support mechanism disposed on the machine base. The sewing machine head is located above the worktable, the feeding mechanism is located on one side of the platform, and the folding mechanism is arranged facing the garment support mechanism. A moving device is slidably connected to the machine base. The feeding mechanism includes a placement plate fixed to the moving device, a swing rod fixedly connected to the moving device, a second drive device rotatably connected to the moving device for driving the swing rod to rotate, a top plate slidably connected to the machine base, and a third drive device fixed to the machine base for pushing the top plate. By setting up the feeding mechanism, manual removal of the garment from the garment support mechanism is avoided, improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of sewing machines, and more specifically to a hem sewing machine. Background Technology

[0002] Existing hem sewing machines require manual folding of the hem of the garment to be sewn, followed by placing the garment on the machine and then manually removing it after sewing. Manual folding of the hem cannot guarantee a perfectly flat fold, and misalignment is prone to occur during the placement process on the machine. The manual folding and subsequent manual removal of the garment is time-consuming, labor-intensive, and inefficient.

[0003] In view of this, the inventors of this case conducted in-depth research on the above-mentioned problems, which led to the creation of this case. Summary of the Invention

[0004] The purpose of this invention is to provide a hem sewing machine that can ensure the hem is folded flat and improve work efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hem sewing machine includes a machine base, and a sewing machine head, a feeding mechanism, a folding mechanism, a worktable, a moving table assembly, and a garment support mechanism disposed on the machine base. The sewing machine head is located above the worktable, the feeding mechanism is located on one side of the worktable, and the folding mechanism is arranged toward the garment support mechanism. The garment support mechanism includes a first rotating roller, a second rotating roller, a first slider, and a second slider. The first slider and the second slider are slidably connected to the table surface. The first rotating roller is rotatably connected to the first slider, and the second rotating roller is rotatably connected to the second slider. The moving table assembly is slidably connected to the machine platform at a position corresponding to the first rotating roller and the second rotating roller. The worktable is fixedly connected to the machine platform at a position corresponding to the first rotating roller and the moving table assembly, and the worktable and the moving table assembly are located on the same horizontal plane. The folding mechanism includes a distance sensor, an air pump, and at least three air blowing pipes, wherein the three air blowing pipes are a first air blowing pipe, a second air blowing pipe, and a third air blowing pipe. The first air blowing pipe is fixed on the side of the first rotating roller away from the moving platform assembly, and the air outlet of the first air blowing pipe faces the first rotating roller. The second air blowing pipe is fixed between the first rotating roller and the moving platform assembly, and the air outlet of the second air blowing pipe faces the lower end face of the moving platform assembly. The third air blowing pipe is fixed below the moving platform assembly, and the air outlet of the third air blowing pipe faces the moving platform assembly. The distance sensor is fixed on the machine platform at a position above the moving platform assembly, and the sensing end of the distance sensor is set facing the moving platform assembly. Each air blowing pipe is connected to the air pump. A moving device is slidably connected to the machine base, and a first driving device for pushing the moving device to slide is fixed on the machine base. The sliding direction of the moving device is perpendicular to the axis of the first rotating roller. The feeding mechanism includes a placement plate fixed to the moving device, a swing rod fixedly connected to the moving device, a second driving device rotatably connected to the moving device for driving the swing rod to swing, a top plate slidably connected to the machine platform, and a third driving device fixed to the machine platform for pushing the top plate. The sliding direction of the top plate is parallel to the axial direction of the first rotating roller. The top plate and the placement plate are located on the same horizontal plane, and the swing rod is located between the first rotating roller and the top plate. The hem sewing machine also includes a limiting mechanism, which is detachably connected to the side of the first slide rail away from the first rotating roller. The limiting mechanism includes a limiting pin and a plurality of connecting holes distributed along the length of the first slide rail. The limiting pin is connected to the corresponding connecting hole according to the fixed position of the first slider. A sliding rod is inserted through the middle of the limiting pin. A rotating block is slidably connected to the sliding rod. Two locking blocks are integrally formed at the lower end of the rotating block. A stop block is fixedly connected below the rotating block. Two locking slots are formed on the stop block. The rotating block rotates on the sliding rod so that the two locking blocks and the two locking slots are locked in one-to-one.

[0006] Preferably, the hem sewing machine further includes a support plate rotatably connected to the machine base and a fourth drive device fixed to the machine base for driving the support plate to rotate, and the support plate is located below the top plate.

[0007] Preferably, the mobile platform assembly includes a first telescopic device fixed on the machine platform, a second telescopic device fixed on the machine platform, a first mobile platform fixedly connected to the telescopic end of the first telescopic device, and a second mobile platform fixedly connected to the telescopic end of the second telescopic device, wherein both the first mobile platform and the second mobile platform slide along the width direction of the machine platform.

[0008] Preferably, the garment support mechanism further includes a contact switch, a contact strip, and a gravity strip. The contact strip is located below the contact switch, the gravity strip is rotatably connected to the workbench, the contact switch is fixed to the workbench, one end of the contact strip is fixedly connected to the lower end surface of the gravity strip, the other end of the contact strip is opposite to the sensing end of the contact switch, and the end of the contact strip away from the gravity strip extends out of the lower end surface of the workbench.

[0009] Preferably, the hem sewing machine further includes a cutting mechanism, which includes a cutting body and a cutting drive mechanism. The cutting drive mechanism is fixedly connected to the machine base, and the cutting body is fixedly connected to the working end of the cutting drive mechanism. The cutting body is located below the moving platform assembly, and the blade of the cutting body faces the moving platform assembly.

[0010] Preferably, the garment support mechanism further includes a first slide rail, which is fixed on the machine platform along the length of the machine platform, and the first slider is slidably connected to the first slide rail.

[0011] Preferably, the garment support mechanism further includes a second slide rail, which is fixed on the machine platform along the length of the machine platform, and the second slider is slidably connected to the second slide rail.

[0012] By adopting the aforementioned design scheme, the beneficial effects of the present invention are as follows: The machine base is equipped with a first rotating roller and a second rotating roller. The hem of the garment to be sewn can be fitted onto the first and second rotating rollers. By setting up an air pump and an air blowing pipe, when the first and second rotating rollers drive the hem of the garment to rotate, air is blown onto the first rotating roller through the air blowing pipe located on the side of the first rotating roller away from the moving table assembly, thus unfolding the hem of the garment on the first rotating roller. Then, the air blowing pipe between the first rotating roller and the moving table assembly blows the hem of the garment downwards towards the moving table assembly. Then, the air blowing pipe located below the moving table assembly keeps the hem of the garment tightly against the lower end surface of the moving table assembly. Driven by the first and second rotating rollers, the folded hem moves to the worktable for sewing. A distance sensor is installed. When the distance sensor detects an increase in the thickness of the garment above the moving platform assembly, it indicates that the hem of the garment on the moving platform assembly has been sewn. The moving platform assembly can then stop supporting the hem. This hem sewing machine automatically folds the hem of the garment with the help of air pipes, ensuring that the hem is folded flat. A placement plate, a swing rod, and a top plate are installed on the frame. The placement plate and the top plate are located on the same horizontal plane. The top plate is used to hold the garment below the first rotating roller against the placement plate. The swing rod swings the garment, which is sleeved on the first and second rotating rollers, off the garment support mechanism and onto the placement plate. The purpose of the top plate is to ensure that the garment falls onto the placement plate. By setting up a feeding mechanism, manual removal of the garment from the garment support mechanism is avoided, improving work efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the hem sewing machine of the present invention; Figure 2 This is a structural schematic diagram of the hem sewing machine of the present invention from another angle; Figure 3 This is a schematic diagram of the structure of the second rotating roller of the hem sewing machine of the present invention (the outer shell of the second rotating roller is omitted). Figure 4 This is a partial structural diagram of the hem sewing machine of the present invention; Figure 5 This is a schematic diagram of the structure of the limiting pin of the hem sewing machine of the present invention; In the diagram: 10. Machine base; 11. Tabletop; 12. Column; 13. Horizontal bar; 14. Support plate. 20. Sewing machine head, 30. Workbench; 31. Contact switch; 32. Contact strip; 33. Gravity strip; 34. Connecting piece; 35. Gravity block. 40. Mobile station assembly; 41. First mobile station; 42. Second mobile station. 51. First rotating roller; 511. First slider; 52. Second rotating roller; 521. Second slider; 53. Correcting wheel. 61. Air tube, 71. Shelf; 72. Swing rod; 73. Second drive unit; 74. Top plate; 75. Sliding plate; 76. Support rod. 81. External thread; 82. Rotating block; 83. Locking block; 84. Locking groove. a. Photoelectric switch. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] In this embodiment, the upper and lower positions are referenced to the position of the hem sewing machine placed on a horizontal ground.

[0016] In this embodiment, the position of the first rotating roller is taken as the right and the position of the second rotating roller is taken as the left. like Figures 1-5 As shown, a hem sewing machine includes a machine base 10, a sewing machine head 20, a feeding mechanism, a folding mechanism, a worktable 30, a moving table assembly 40, and a garment-stretching mechanism for spreading garments on the table surface 11 of the machine base 10. The sewing machine head 20 is located above the worktable 30, the feeding mechanism is located on one side of the table surface 11, and the folding mechanism is arranged facing the garment-stretching mechanism.

[0017] The machine platform 10 includes four columns 12, which are fixed to the lower end of the table surface 11. A crossbar 13 is connected between two adjacent columns 12. The two ends of the crossbar 13 are fixedly connected to the corresponding two columns 12 to increase the stability of the machine platform.

[0018] The garment support mechanism includes a first rotating roller 51, a second rotating roller 52, a first slider 511, and a second slider 521. The first slider 511 and the second slider 521 are slidably connected to the table surface 11, the first rotating roller 51 is rotatably connected to the first slider 511, and the second rotating roller 52 is rotatably connected to the second slider 521.

[0019] In this embodiment, the length direction of the machine platform 10 is defined as the direction perpendicular to the axial direction of the first rotating roller 51, and the width direction of the machine platform 10 is defined as the direction parallel to the axial direction of the first rotating roller 51.

[0020] The garment support mechanism in this embodiment also includes a first slide rail, which is fixed on the table surface 11 along the length of the machine base 10. A first slider 512 is slidably connected to the first slide rail, and a first motor for driving the first rotating roller 51 to rotate is disposed inside the first slider 512. The first slider 512 is slidably connected to the first slide rail, and the distance between the first rotating roller 51 and the second rotating roller 52 can be changed by sliding the first slider 512 along the first slide rail, so that the garment support mechanism can be used for garments of different sizes, improving the applicability of the hem sewing machine.

[0021] The garment support mechanism in this embodiment also includes a second slide rail, which is fixed on the table surface 11 along the length of the machine base 10. The first slide rail and the second slide rail 521 are on the same straight line. The second rotating roller 52 is rotatably connected to the second slider 521. In this embodiment, the second slider 521 is equipped with a second motor for driving the second rotating roller 52 to rotate, and the rotation directions of the first motor and the second motor are the same. In this embodiment, a drive motor for driving the second slider 521 to slide is also provided on the side of the second slide rail 521 away from the second rotating roller 52. The drive motor is connected to the second slider 521 via belt drive.

[0022] The second slider 521 is driven by a drive motor to slide on the second slide rail, thereby changing the distance between the first rotating roller 51 and the second rotating roller 52, so that the garment support mechanism can be used for different sizes of clothing, improving the applicability of the hem sewing machine.

[0023] The movable stage assembly 40 is slidably connected to the machine base 10 at a position corresponding to the first rotating roller 51 and the second rotating roller 52. The worktable 30 is fixedly connected to the machine base 10 at a position corresponding to the second rotating roller 52 and the movable stage assembly 40, and the worktable 30 and the movable stage assembly 40 are located on the same horizontal plane. In this embodiment, the first rotating roller 51, the worktable 30, the movable stage assembly 40, and the second rotating roller 52 are linearly distributed along the length direction of the table surface 11.

[0024] The folding mechanism includes a distance sensor, an air pump, and at least three air pipes 61. The three air pipes 61 are designated as a first air pipe, a second air pipe, and a third air pipe. The first air pipe is fixed to the side of the first rotating roller 51 away from the moving platform assembly 40, with its outlet facing the first rotating roller 51. The second air pipe is fixed between the first rotating roller 51 and the moving platform assembly 40, with its outlet facing the lower end face of the moving platform assembly 40. The third air pipe is located below the moving platform assembly 40, with its outlet facing the moving platform assembly 40. In addition to the aforementioned three air pipes 61, this embodiment also provides an air pipe 61 above the first rotating roller 51, with its outlet facing the first rotating roller 51. The distance sensor is fixed on the machine base 10 at a position corresponding to the position above the moving platform assembly 40, and each air pipe 61 is connected to the air pump.

[0025] The folding mechanism operates as follows: When the first rotating roller 51 and the second rotating roller 52 rotate the hem of the garment, air is blown onto the first rotating roller 51 through the first air pipe to unfold the hem of the garment on the first rotating roller. Then, the hem of the garment is blown downwards through the air pipe 61 above the first rotating roller 51, and then blown towards the lower end face of the moving table assembly 40 through the second air pipe. Finally, the third air pipe keeps the hem of the garment tightly attached to the lower end face of the moving table assembly 40. Driven by the first rotating roller 51 and the second rotating roller 52, the folded hem is moved to the worktable 30 for sewing. By setting a distance sensor, when the distance sensor senses an increase in the thickness of the garment above the moving table assembly 40, it means that the garment above the moving table assembly 40 has been sewn. The moving table assembly 40 can then stop supporting the hem of the garment. This hem sewing machine automatically folds the hem of the garment with the help of the air pipe 61, ensuring that the hem of the garment is folded flat.

[0026] In this embodiment, the side of the second slide rail away from the first rotating roller 51 is defined as the left, and the side of the second slide rail away from the second rotating roller 52 is defined as the right.

[0027] A moving device is slidably connected to the machine base 10, and a first driving device for pushing the moving device to slide is fixed on the machine base 10. The sliding direction of the moving device is perpendicular to the axis of the first rotating roller 51.

[0028] The feeding mechanism includes a placement plate 71 fixed on the moving device, a swing rod 72 fixedly connected to the moving device, a second drive device 73 rotatably connected to the moving device for driving the swing rod 72 to swing, a top plate 74 slidably connected to the machine base 10, and a third drive device fixed on the lower end surface of the table 11 for pushing the top plate 74. The sliding direction of the top plate 74 is parallel to the axial direction of the first rotating roller 51. The top plate 74 and the placement plate 71 are located on the same horizontal plane. Before the feeding mechanism starts working, the placement plate 71 is located to the left of the top plate 74, and the swing rod 72 is located between the first rotating roller 51 and the top plate 74. In this embodiment, the first drive device, the second drive device 73, and the third drive device are all conventional cylinder devices.

[0029] In this embodiment, the machine 10 has the side with the shelf 71 as the front and the other side as the rear.

[0030] The moving device in this embodiment includes a sliding plate 75, a support rod 76, and a vertical pole.

[0031] A conventional slide rail is provided on a crossbar 13 located on one side in front of the machine platform 10 and arranged along the length of the machine platform 10. A sliding plate 75 is slidably connected to the slide rail, a support rod 76 is fixedly connected to the upper end face of the sliding plate 75, and the lower end face of the shelf 71 is fixedly connected to the upper end of the support rod 76. The piston rod of the cylinder of the first drive device is rotatably connected to the lower end face of the sliding plate 75. A second drive device 73 is rotatably connected to the sliding plate 75, and a vertical rod is fixedly connected to the sliding plate 75. A first transmission rod is rotatably connected to the vertical rod. The piston rod of the cylinder of the second drive device is rotatably connected to one end of the first transmission rod. A swing rod 72 is fixedly connected to the other end of the first transmission rod and is located below the first rotating roller 51. The second drive device drives the first transmission rod to rotate, and then the first transmission rod drives the swing rod 72 to rotate radially around the first transmission rod. A third drive device is fixed to the lower end face of the table 11, and the piston rod of the cylinder of the third drive device is rotatably connected to the top plate 74.

[0032] The working principle of the feeding mechanism is as follows: one end of the garment attached to the garment support mechanism hangs down to the bottom of the top plate 74. The first driving device drives the sliding plate 75 and the swing rod 72 to slide towards the top plate 74 until the placement plate 71 is directly in front of the top plate 74. At this time, the swing rod 72 is exactly on the side of the garment close to the first rotating roller 51. The third driving device drives the top plate 74 to move away from the machine platform 10 until the top plate 74 presses one end of the garment against the placement plate 71. The swing rod 72 swings away from the table surface 11 so that the garment attached to the garment support mechanism is taken off the garment support mechanism and placed on the placement plate 71. The top plate 74 is set to press one end of the garment against the side of the placement plate 71 to ensure that the feeding mechanism can accurately take the garment off the garment support mechanism and place it on the placement plate 71.

[0033] The feeding mechanism of this embodiment can also be applied to other conventional sewing machines.

[0034] In a preferred embodiment, the hem sewing machine further includes a support plate 14 rotatably connected to the machine base 10 and a fourth drive device fixed to the machine base 10 for driving the support plate 14 to rotate, with the support plate 14 located below the top plate 74. The fourth drive device in this embodiment can be a conventional cylinder. The piston rod of the cylinder is rotatably connected to one end of a swing block, the middle of which is rotatably connected to the lower end surface of the table 11. The other end of the swing block is fixed with a second transmission rod, the two ends of which are respectively fixedly connected to one side of the support plate 14. By setting the support plate 14 below the second rotating roller 52, one end of the garment fitted onto the garment support mechanism can be placed on the support plate 14, preventing the garment from slipping off the garment support mechanism due to gravity. When the feeding mechanism is activated, the support plate 14 rotates away from the table 11, allowing the garment to hang naturally, facilitating the top plate 74 to press the garment against the placement plate 71. In a preferred embodiment, the moving platform assembly 40 includes a first telescopic device fixed to the machine base 10, a second telescopic device fixed to the machine base 10, a first moving platform 41 fixedly connected to the telescopic end of the first telescopic device, and a second moving platform 42 fixedly connected to the telescopic end of the second telescopic device. Both the first moving platform 41 and the second moving platform 42 slide along the width direction of the machine base 10. In this embodiment, the first telescopic device and the second telescopic device can be conventional cylinders. The moving platform assembly 40 is used as follows: after the distance sensor detects a change in the hem of the garment, the first moving platform 41 moves away from the shelf 71, while the second moving platform 42 continues to support the garment. When the top plate 74 presses the garment against the shelf 71, the second moving platform 42 moves away from the shelf 71.

[0035] In a preferred embodiment, the garment support mechanism further includes a contact switch 31, a contact bar 32, and a gravity bar 33. The contact bar 32 is located below the contact switch 31, and the gravity bar is rotatably connected to the workbench 30.

[0036] The workbench 30 in this embodiment includes a connecting piece 34 fixed below the workbench of the sewing machine head 20. One end of the gravity bar 33 is rotatably connected to the connecting piece 34. The contact switch 31 is fixedly connected to the connecting piece 34 of the workbench 30. One end of the contact bar 32 is fixedly connected to the gravity bar 33. The other end of the contact bar 32 is opposite to the sensing end of the contact switch 31, and the end of the contact bar 32 away from the gravity bar 33 extends out of the lower end face of the workbench 30. In this embodiment, a gravity block 35 is rotatably connected to the connecting piece 34 above the gravity bar 33. One end of the gravity block 35 is rotatably connected to the connecting piece 34, and the other end of the gravity block 35 presses against the gravity bar 33. The connecting piece 34 has a notch for the contact strip 32 to pass through. The end of the contact strip 32 away from the gravity bar 33 is located below the notch. The gravity block 35 presses against the gravity bar 33, causing the gravity bar 33 to drive the contact strip 32 downward through the notch of the connecting piece 34. When the garment support mechanism gradually expands the garment, the hem of the garment drives the contact strip 32 below the notch to move upward. When the contact strip 32 touches the contact switch 31, the second rotating roller 52 stops sliding. By setting the contact strip 32 and the contact switch 31, when different sizes of garments are fitted on the garment support mechanism, the contact strip 32 can touch the contact switch 31 so that the garment support mechanism can expand the garment to a suitable degree for hem sewing.

[0037] The garment support mechanism of this embodiment can also be applied to other conventional sewing machines.

[0038] In a preferred embodiment, the hem sewing machine further includes a limiting mechanism. The limiting mechanism is detachably connected to the side of the first slide rail 511 away from the first rotating roller 51. The limiting mechanism includes a limiting pin and a plurality of connecting holes (not shown in the figure) distributed along the length direction of the first slide rail 511. The limiting pin is connected to the corresponding connecting hole according to the fixed position of the first slider 512. Each connecting hole has an internal thread section on its hole wall. The outer wall of the lower end of the limiting pin has an external thread 81 for detachable connection to the connecting hole. A sliding rod is inserted through the middle of the limiting pin. A rotating block 82 is slidably connected to the sliding rod. Two locking blocks 83 are integrally formed at the lower end of the rotating block 82. A stop block is fixedly connected below the rotating block 82. Two locking grooves 84 are formed on the stop block. The rotating block 82 can rotate on the sliding rod so that the two locking blocks 83 and the two locking grooves 84 are locked in a one-to-one correspondence. When the first slider 512 is slid to the required production position, the limiting pin is connected to the corresponding connecting hole, and the rotating block 82 is pulled upward to make the locking block 83 disengage from the locking groove 84. By rotating, the lower end of the rotating block 82 abuts against the upper end of the abutting block. By setting a limiting mechanism on the first slide rail 511, the first slider 512 is prevented from disengaging from the first slide rail 511.

[0039] In a preferred embodiment, the hem sewing machine further includes a cutting mechanism. The cutting mechanism comprises a cutting body and a cutting drive mechanism. The cutting drive mechanism is fixedly connected to the machine base 10, and the cutting body is fixedly connected to the working end of the cutting drive mechanism. The cutting body is located below the moving table assembly 40, and the blade of the cutting body faces the moving table assembly 40. By providing the cutting mechanism, the needle thread on the hem of the garment can be cut off. In this embodiment, the cutting drive mechanism is a lead screw stepper motor.

[0040] The operation of this hem sewing machine is as follows: The garment is placed on the garment support mechanism. The first rotating roller 51 and the second rotating roller 52 rotate under the drive of the motor. The second slider 521 slides away from the first slider 512. When the contact strip 32 touches the contact switch 31, the second rotating roller 52 stops sliding. The folding mechanism folds the hem of the garment through the cooperation of four air pipes 61. When the hem of the garment moves the contact strip 32 to touch the contact switch 31, the sewing machine head 20 starts sewing the hem of the garment. During the sewing process, the correction device can adjust the position of the garment. After the garment is sewn, it is placed on the shelf 71 through the feeding mechanism.

[0041] In summary, this hem sewing machine can automatically fold the hem of clothing to ensure a flat fold, and it can also automatically feed the material, effectively improving the working efficiency of the hem sewing machine.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hem sewing machine characterized by: The machine includes a machine base, and a sewing machine head, a feeding mechanism, a folding mechanism, a worktable, a moving table assembly, and a garment support mechanism disposed on the machine base. The sewing machine head is located above the worktable, the feeding mechanism is located on one side of the table, and the folding mechanism is arranged towards the garment support mechanism. The garment support mechanism includes a first rotating roller, a second rotating roller, a first slider, and a second slider. The first slider and the second slider are slidably connected to the table surface. The first rotating roller is rotatably connected to the first slider, and the second rotating roller is rotatably connected to the second slider. The moving table assembly is slidably connected to the machine platform at a position corresponding to the first rotating roller and the second rotating roller. The worktable is fixedly connected to the machine platform at a position corresponding to the first rotating roller and the moving table assembly, and the worktable and the moving table assembly are located on the same horizontal plane. The folding mechanism includes a distance sensor, an air pump, and at least three air blowing pipes, wherein the three air blowing pipes are a first air blowing pipe, a second air blowing pipe, and a third air blowing pipe. The first air blowing pipe is fixed on the side of the first rotating roller away from the moving platform assembly, and the air outlet of the first air blowing pipe faces the first rotating roller. The second air blowing pipe is fixed between the first rotating roller and the moving platform assembly, and the air outlet of the second air blowing pipe faces the lower end face of the moving platform assembly. The third air blowing pipe is fixed below the moving platform assembly, and the air outlet of the third air blowing pipe faces the moving platform assembly. The distance sensor is fixed on the machine platform at a position above the moving platform assembly, and the sensing end of the distance sensor is set facing the moving platform assembly. Each air blowing pipe is connected to the air pump. A moving device is slidably connected to the machine base, and a first driving device for pushing the moving device to slide is fixed on the machine base. The sliding direction of the moving device is perpendicular to the axis of the first rotating roller. The feeding mechanism includes a placement plate fixed to the moving device, a swing rod fixedly connected to the moving device, a second driving device rotatably connected to the moving device for driving the swing rod to rotate, a top plate slidably connected to the machine platform, and a third driving device fixed to the machine platform for pushing the top plate. The sliding direction of the top plate is parallel to the axial direction of the first rotating roller. The top plate and the placement plate are located on the same horizontal plane, and the swing rod is located between the first rotating roller and the top plate. The hem sewing machine also includes a limiting mechanism, which is detachably connected to the side of the first slide rail away from the first rotating roller. The limiting mechanism includes a limiting pin and a plurality of connecting holes distributed along the length of the first slide rail. The limiting pin is connected to the corresponding connecting hole according to the fixed position of the first slider. A sliding rod is inserted through the middle of the limiting pin. A rotating block is slidably connected to the sliding rod. Two locking blocks are integrally formed at the lower end of the rotating block. A stop block is fixedly connected below the rotating block. Two locking slots are formed on the stop block. The rotating block rotates on the sliding rod so that the two locking blocks and the two locking slots are locked in one-to-one.

2. A hem sewing machine as claimed in claim 1, characterized in that: The hem sewing machine also includes a support plate rotatably connected to the machine base and a fourth drive device fixed to the machine base for driving the support plate to rotate, and the support plate is located below the top plate.

3. A hem sewing machine as claimed in claim 1, characterized in that: The mobile platform assembly includes a first telescopic device fixed on the machine platform, a second telescopic device fixed on the machine platform, a first mobile platform fixedly connected to the telescopic end of the first telescopic device, and a second mobile platform fixedly connected to the telescopic end of the second telescopic device. Both the first mobile platform and the second mobile platform slide along the width direction of the machine platform.

4. A hem sewing machine as claimed in claim 1, characterized in that: The garment support mechanism also includes a contact switch, a contact strip, and a gravity strip. The contact strip is located below the contact switch, and the gravity strip is rotatably connected to the workbench. The contact switch is fixed to the workbench. One end of the contact strip is fixedly connected to the lower end face of the gravity strip, and the other end of the contact strip is opposite to the sensing end of the contact switch. The end of the contact strip away from the gravity strip extends out of the lower end face of the workbench.

5. A hem sewing machine as claimed in claim 1, characterized in that: The hem sewing machine also includes a cutting mechanism, which includes a cutting body and a cutting drive mechanism. The cutting drive mechanism is fixedly connected to the machine base, and the cutting body is fixedly connected to the working end of the cutting drive mechanism. The cutting body is located below the moving platform assembly, and the blade of the cutting body faces the moving platform assembly.

6. A hem sewing machine as claimed in claim 1, characterized in that: The garment support mechanism further includes a first slide rail, which is fixed on the machine platform along the length of the machine platform, and the first slider is slidably connected to the first slide rail.

7. A hem sewing machine according to claim 1 or 6, wherein: The garment support mechanism also includes a second slide rail, which is fixed on the machine platform along the length of the machine platform, and the second slider is slidably connected to the second slide rail.

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