A kind of deviation rectifying mechanism suitable for planar cloth

Abstract

The application discloses a deviation rectifying mechanism suitable for flat cloth, which comprises a rear deviation rectifying mechanism and a front deviation rectifying mechanism. The rear deviation rectifying mechanism comprises small deviation rectifying wheels and large deviation rectifying wheels for driving the cloth to change the moving direction. The small deviation rectifying wheels are arranged above a small sewing table of a sewing table and are connected with small wheel lifting cylinders. The large deviation rectifying wheels are arranged above the sewing table right to the small deviation rectifying wheels and are connected with large wheel lifting cylinders. One side of the large deviation rectifying wheels is provided with a large cloth blocking plate. The small sewing table is further provided with a small cloth blocking plate and a cloth sensor for detecting the cloth. The front deviation rectifying mechanism comprises a cloth moving synchronous belt arranged on a front lifting mechanism of the sewing table and used for driving the cloth to move. The deviation rectifying mechanism has the advantages of simple structure, high speed sewing deviation rectifying and being suitable for deviation rectifying of various width cloths.

Description

Technical Field

[0001] This invention relates to the field of sewing device technology, and in particular to a correction mechanism adapted to flat fabric pieces. Background Technology

[0002] Currently, the correction structure used in sewing devices is mainly a two-way wheel with a worm gear for correction. This type of correction device is suitable for three-dimensional cylindrical fabrics, but not for flat fabrics. It is also complex, costly, difficult to maintain, and cannot cope with high-speed sewing correction. It has a small correction force and is not suitable for large fabrics. Chinese patent document CN215517902U, published on January 14, 2022, discloses a dual worm gear correction mop device, including a roller, a worm shaft passing through and rotating with the roller, and 6 pairs of 12 grooves extending through the front and rear ends on the circumferential surface of the roller. The arc lengths of adjacent grooves are equal. 6 pairs of 12 steering pulleys and 3 pairs of 6 drive pulleys are respectively mounted on the end face of the roller. The 3 pairs of drive pulleys are closer to the axis of the roller than the steering pulleys and are arranged alternately with respect to the 6 pairs of steering pulleys. A worm wheel is fixed in the middle of each pair. A front worm and a rear worm are fixed on the worm shaft, and the worm wheel meshes with the front worm or the rear worm respectively. An endless circular belt is wound around each steering pulley and drive pulley, with the endless circular belt part protruding outside the groove. Compared with existing technologies, this structure adopts a double worm gear mechanism, which makes more efficient use of space and arranges the 12 correction belts evenly, achieving good correction effect at any angle. It is mainly suitable for correction of three-dimensional cylindrical fabrics. However, the correction device of this structure is complex, costly, difficult to maintain, and struggles to cope with high-speed sewing correction. It also has weak correction force and is not suitable for correction of large flat fabric pieces. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of existing correction devices, such as complex structure, high cost, difficult maintenance, inability to cope with high-speed sewing correction, weak correction force, and unsuitability for large flat fabric pieces. The invention provides a correction mechanism suitable for flat fabric pieces, which has the advantages of simple structure, suitability for high-speed sewing correction, and suitability for correction of flat fabric pieces of various widths.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is a correction mechanism suitable for flat fabric pieces, which is set on a sewing table. The sewing table has a notch in the middle of its rear side for accommodating an overlock sewing machine, and a small sewing table is provided in front of the notch.

[0005] The aforementioned correction mechanism includes a rear correction mechanism and a front correction mechanism. The rear correction mechanism is located on the right rear side of the sewing table. The rear correction mechanism includes a small correction wheel assembly and a large correction wheel assembly for driving the fabric piece to change its direction of movement. The small correction wheel assembly is located above the small sewing table near the notch. The small correction wheel in the small correction wheel assembly is raised and lowered by connecting to a small wheel lifting cylinder. The small sewing table is also provided with a small fabric baffle and a fabric sensor for detecting the fabric piece. The large correction wheel assembly is located above the sewing table to the right of the small correction wheel assembly. The large correction wheel in the large correction wheel assembly is raised and lowered by connecting to a large wheel lifting cylinder. The left sides of both the small and large correction wheels are tilted backward. A large fabric baffle is provided on the rear side of the large correction wheel.

[0006] The front correction mechanism includes a fabric transfer timing belt for moving the fabric piece. The fabric transfer timing belt is located on the front side of the sewing table and is mounted on the fabric transfer timing belt lifting mechanism.

[0007] The correction mechanism also includes a controller, which is connected to the rear correction mechanism, the front correction mechanism, and the fabric sensor.

[0008] This invention features two correction mechanisms, one at the front and one at the rear. The front correction mechanism is located on the front side of the sewing table, while the rear correction mechanism is located on the right rear side of the sewing table (the side of the fabric to be sewn). Large and small baffles are also located on the side of the fabric to be sewn. These baffles guide and limit the position of the fabric, ensuring that the rear edge of the fabric is tightly against them during normal operation. In normal operation (i.e., when the fabric moves normally without correction), the small and large correction wheels in the small and large correction wheel assemblies rise and do not contact the fabric. The rear edge of the fabric (the sewing edge) moves to the left, tightly against the large and small baffles, driven by the overlock machine. Simultaneously, the synchronous belt on the front correction mechanism moves the front edge of the fabric to the left in sync. This ensures that both the front and rear sides of the fabric move smoothly and synchronously to the left, allowing the overlock machine to complete the sewing operation on the rear edge of the fabric. When the fabric sensor detects that the fabric has deviated forward (outward deviation), the controller controls the small and large correction wheels in the small and large correction wheel assemblies to descend and contact the fabric. Since the left sides of both the small and large correction wheels are tilted backward, meaning there is an angle between their radial planes and the normal direction of fabric movement, the rolling of these wheels on the fabric moves it backward, thus correcting the deviation. Simultaneously, the fabric shifting synchronous belt on the front correction mechanism decelerates and works in conjunction with the rear correction mechanism to return the deviated fabric to its normal position. The large and small fabric stoppers ensure that the fabric edges remain close to the stoppers during sewing, preventing over-correction. Conversely, when the fabric sensor detects that the fabric has deviated backward, the small and large correction wheels rise and no longer contact the fabric. The fabric shifting synchronous belt on the front correction mechanism accelerates, speeding up the forward movement of the fabric and returning it to its normal position. In this way, the front and rear correction mechanisms work together to allow the fabric to be corrected in a controllable and rapid manner. This solves the problems of existing correction devices, such as complex structure, high cost, difficult maintenance, inability to handle high-speed sewing correction, weak correction force, and unsuitability for large fabric pieces. The correction mechanism of this invention has the advantages of simple structure, applicability to high-speed sewing correction, and suitability for correction of fabric pieces of various widths, greatly improving the applicability of the correction mechanism.

[0009] Preferably, the small steering wheel is connected to the small wheel lifting cylinder via a small wheel connecting arm and a small wheel connecting plate. The small wheel lifting cylinder is fixed to the bottom of the small slit platform via a cylinder connecting bracket. The small wheel lifting cylinder is used for lifting and lowering the small steering wheel.

[0010] Preferably, the large steering wheel is connected to the large wheel lifting cylinder via a large wheel connecting arm and a large wheel connecting plate. The large wheel lifting cylinder is fixed to the movable rod of the large wheel telescopic cylinder, which is also fixed to the sewing table surface. The large wheel lifting cylinder is used to raise and lower the large steering wheel, and the large wheel telescopic cylinder is used to move the raised large steering wheel backward to avoid positional conflicts with other mechanisms on the sewing machine.

[0011] Preferably, a small baffle plate is fixed to the small sewing platform, and a rear baffle block on the rear side of the small baffle plate is fixed to the small sewing platform. An upper baffle plate is provided on the front side of the small baffle plate. The upper baffle plate, the rear baffle block, and the small sewing platform form a limiting channel for the fabric piece. An extended baffle section is provided on the left side of the rear baffle block. The front edge of the upper baffle plate is rolled upwards to form a front guide section that facilitates the entry of the fabric piece. The front guide section extends to the left to form an extended guide section. A through groove for accommodating the small correction wheel is provided in the middle of the upper baffle plate, and a sensor hole for installing the fabric piece sensor is provided on the rear side of the through groove. The upper baffle plate on the front side of the small baffle plate prevents the sewing edge of the fabric piece from curling upwards. The rear baffle block is used to closely adhere to the rear (sewing side) edge of the fabric piece. The front guide section guides the fabric piece when it is manually placed and is about to enter the small baffle plate. The extended guide section guides the fabric piece when it just begins to enter the small baffle plate. These two guiding structures reduce the probability of fabric jamming in the sewing machine and improve machine stability. The through slot is used to set the small correction wheel. The sensor hole is located on the rear side of the left end of the through slot, near the back baffle block, and is used to install the fabric sensor.

[0012] Preferably, the large baffle is fixed to the sewing table surface. The large baffle includes a rear baffle fixed to the sewing table surface and an upper baffle connected above the rear baffle and extending forward. The rear baffle, the upper baffle, and the sewing table surface form a limiting channel for the fabric piece. The front edge of the upper baffle is curled upward to form a guide edge to facilitate the entry of the fabric piece. The cross-sectional structure of the large baffle is similar to that of the small baffle. The rear baffle is used to fit tightly against the rear (sewing side) edge of the fabric piece, the upper baffle is used to prevent the sewing edge of the fabric piece from curling upward, and the guide edge facilitates the insertion of the fabric piece.

[0013] Preferably, the front correction mechanism is an active correction mechanism. A support column is located on the left rear side of the sewing table, and a central fixing plate is mounted on the support column. Two forward-extending parallel connecting arms are mounted on the central fixing plate. A front fixing plate is located at the front end of the two connecting arms. Parallel swing arms are rotatably connected to both ends of the front fixing plate. Each of the two swing arms is connected to one end of a synchronous wheel lifting cylinder. A transmission synchronous belt assembly is mounted on both ends of one swing arm. A drive motor is connected to the upper end of the transmission synchronous belt assembly, and the lower end is connected to the fabric transfer synchronous belt via a rotating shaft and a synchronous wheel. The lower ends of the two swing arms are hinged to both ends of the synchronous wheel fixing plate. The synchronous wheel and the fabric transfer synchronous belt are mounted on the synchronous wheel fixing plate. Here, active correction refers to actively adjusting the movement speed of the fabric piece by accelerating or decelerating it using the fabric transfer synchronous belt, thereby correcting the movement deviation of the fabric piece. The swing arms can drive the fabric transfer synchronous belt at their lower ends to rise and fall by swinging. During normal sewing, the fabric transfer synchronous belt descends to fit against the fabric piece and moves it. In addition, by adjusting the speed of the synchronous belt for fabric transfer, the moving speed of the front side of the fabric sheet can be changed, thereby achieving deviation correction.

[0014] Preferably, the front fixed plate, the swing arm, and the synchronous wheel fixed plate form a parallelogram mechanism. When the synchronous wheel lifting cylinder is activated, the fabric transfer synchronous belt rises or falls and is parallel to the sewing table surface. The outer side of the fabric transfer synchronous belt is covered with a rubber layer. The synchronous wheel lifting cylinder extends and retracts to lift or lower the swing arm, causing the two swing arms to swing, thereby achieving parallel lifting and lowering of the synchronous wheel and the fabric transfer synchronous belt. The rubber layer on the outer side of the fabric transfer synchronous belt can increase the frictional force in contact with the fabric.

[0015] Preferably, the rear correction mechanism is a passive correction mechanism. Both the large and small correction wheels are rubber wheels. The radial plane of the large correction wheel forms an angle of 8-12 degrees with the direction of fabric movement, and the radial plane of the small correction wheel forms an angle of 30-40 degrees with the direction of fabric movement. Passive correction means that neither the large nor small correction wheels have a drive mechanism. When the fabric shifts forward, the large and small correction wheels descend and contact the fabric. The movement of the fabric causes the large and small correction wheels to roll on the fabric. Since the radial planes of the large and small correction wheels are not in the direction of fabric movement but are biased towards the rear of the fabric, their rolling motion can cause the fabric to shift backward, thus achieving correction. Using rubber wheels for the large and small correction wheels increases the friction in contact with the fabric.

[0016] As an alternative, the rear correction mechanism is an active correction mechanism. Both the large and small correction wheels are rubber wheels, connected to a servo motor, which is connected to a controller. The radial plane of the large correction wheel forms an angle of 8-12 degrees with the fabric movement direction, while the angle of the small correction wheel is 30-40 degrees. This solution is similar to the aforementioned passive correction solution, except that both the large and small correction wheels rotate autonomously for correction. To prevent fabric wrinkling, the rotational linear speed of the large and small correction wheels is typically lower than the fabric's movement speed on the overlock sewing machine.

[0017] The beneficial effects of this invention are that it effectively solves the problems of existing correction devices being complex in structure, costly and difficult to maintain, unable to cope with high-speed sewing correction, having weak correction force, and being unsuitable for large fabric pieces. The correction mechanism of this invention, applicable to flat fabric pieces, has the advantages of simple structure, being suitable for high-speed sewing correction, and being suitable for correction of fabric pieces of various widths, greatly improving the applicability of the correction mechanism and having high practical value. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a correction mechanism applicable to planar fabric pieces according to the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the post-correction mechanism of the present invention;

[0020] Figure 3 This is a top view of the post-correction mechanism of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the small baffle plate of the present invention;

[0022] Figure 5 This is a schematic diagram of another three-dimensional structure of the small baffle plate of the present invention.

[0023] In the diagram: 5. Sewing table, 20. Axis fixing plate, 30. Small wheel connecting plate, 31. Cylinder connecting bracket, 32. Large wheel front and rear telescopic cylinder, 33. Large wheel lifting cylinder, 34. Large baffle plate, 35. Large wheel connecting arm, 36. Large correction wheel, 37. Small wheel connecting arm, 38. Small correction wheel, 39. Small baffle plate, 391. Baffle extension section, 392. Front guide section, 393. Extension guide section, 394. Through groove, 395. Sensor hole, 396. Rear baffle block, 40. Fabric sensor, 41. Small wheel lifting cylinder, 42. Large wheel connecting plate, 50. Notch, 51. Small sewing table, 80. Fabric transfer timing belt, 81. Rotating shaft, 82. Timing wheel fixing plate, 83. Swing arm, 84. Timing wheel lifting cylinder, 85. Transmission timing belt, 86. Drive motor, 87. Connecting arm. Detailed Implementation

[0024] The specific implementation of the technical solution of the present invention will be further described below through examples and in conjunction with the accompanying drawings.

[0025] Example 1

[0026] In such Figure 1 Figure 2 In Embodiment 1 shown, a correction mechanism suitable for flat fabric pieces is installed on a sewing table 5. The sewing table 5 has a notch 50 at the center of its rear side for accommodating an overlock sewing machine. A small sewing platform 51 is located in front of the notch 50. The correction mechanism includes a rear correction mechanism and a front correction mechanism. The rear correction mechanism is located on the right rear side of the sewing table 5 and includes a small correction wheel assembly and a large correction wheel assembly for changing the direction of movement of the fabric piece. The small correction wheel assembly is located above the small sewing platform 51 near the notch 50. The small correction wheel 38 in the small correction wheel assembly is raised and lowered by connecting to a small wheel lifting cylinder 41. The large correction wheel assembly is located above the sewing table 5 to the right of the small correction wheel assembly. The large correction wheel 36 in the large correction wheel assembly is raised and lowered by connecting to a large wheel lifting cylinder 33. The left sides of both the small and large correction wheels are tilted backward. In this embodiment, the rear correction mechanism is a passive correction mechanism. Both the large correction wheel 36 and the small correction wheel 38 are rubber wheels. The radial plane of the large correction wheel 36 forms an angle of 10 degrees with the direction of fabric movement, and the radial plane of the small correction wheel 38 forms an angle of 35 degrees with the direction of fabric movement (see...). Figure 3 ).

[0027] The small correction wheel 38 is connected to the small wheel lifting cylinder 41 via the small wheel connecting arm 37 and the small wheel connecting plate 30. The small wheel lifting cylinder 41 is fixed to the bottom of the small sewing table 51 via the cylinder connecting bracket 31. The small wheel lifting cylinder here can be a cylinder with a slide rail or a cylinder with a guide rod. The small sewing table 51 is also equipped with a small fabric baffle 39 and a fabric sensor 40 for detecting fabric pieces. The small fabric baffle 39 is fixed to the small sewing table 51. The rear fabric baffle block 396 on the rear side of the small fabric baffle 39 is fixed to the small sewing table 51. The front side of the small fabric baffle 39 is equipped with an upper baffle. The upper baffle, the rear fabric baffle block 396 and the small sewing table 51 form a limiting channel for the fabric piece. Here, the upper baffle is used to prevent the sewing edge of the fabric piece from curling upwards, and the rear fabric baffle block is used to fit tightly against the rear side edge (sewing edge) of the fabric piece. The left side of the back baffle block 396 is provided with a baffle extension section 391. The front edge of the upper baffle is rolled upward to form a front guide section 392 to facilitate the entry of the fabric piece. The front guide section 392 extends to the left to form an extended guide section 393. The front guide section 392 can guide the fabric piece when it is manually placed and is about to enter the small baffle block 39. The extended guide section 393 can guide the fabric piece when it just begins to enter the small baffle block 39. The above two guiding structures can reduce the probability of fabric jamming in the sewing machine and improve the stability of the machine. The middle of the upper baffle is provided with a through groove 394 for accommodating the small correction wheel 38. The rear side of the through groove 394 is provided with a sensor hole 395 for installing the fabric piece sensor 40. The sensor 395 is located on the rear side of the left end of the through groove 394 near the back baffle block 396 and is used to install the fabric piece sensor 40.

[0028] A large baffle plate 34 is provided on the rear side of the large correction wheel 36. The large baffle plate 34 is fixed on the sewing table 5 and includes a rear baffle fixed to the sewing table 5 and an upper baffle connected above the rear baffle and extending forward. The rear baffle, the upper baffle, and the sewing table form a limiting channel for the fabric. The front edge of the upper baffle is curled upward to form a guide edge to facilitate the entry of the fabric. The large correction wheel 36 is connected to the large wheel lifting cylinder 33 through the large wheel connecting arm 35 and the large wheel connecting plate 42. The large wheel lifting cylinder 33 is fixed on the movable rod of the large wheel front and rear telescopic cylinder 32, which is fixed on the sewing table 5. The large wheel front and rear telescopic cylinder 32 is used to move the large correction wheel 36 backward in the raised state to avoid positional conflict with other mechanisms on the sewing machine. The large wheel lifting cylinder 33 and the large wheel front and rear telescopic cylinder 32 can be double-rod cylinders or cylinders with guide rods.

[0029] The front correction mechanism includes a fabric transfer timing belt 80 for moving the fabric piece. The fabric transfer timing belt 80 is located on the front side of the sewing table 5 and is mounted on the fabric transfer timing belt lifting mechanism. In this embodiment, the front correction mechanism is an active correction mechanism. A support column is provided on the left rear side of the sewing table. A shaft fixing plate 20 is provided on the support column. Two forward-extending parallel connecting arms 87 are provided on the shaft fixing plate 20. A front fixing plate is provided at the front end of the two connecting arms 87. Parallel swing arms 83 are rotatably connected to both ends of the front fixing plate. The two swing arms 83 are respectively connected to one end of the synchronous wheel lifting cylinder 84. A transmission timing belt assembly 85 is provided at both ends of one swing arm 83. A drive motor 86 is connected to the upper end of the transmission timing belt assembly 85, and the lower end is connected to the fabric transfer timing belt 80 through a rotating shaft 81 and a synchronous wheel. The lower ends of the two swing arms 83 are hinged to both ends of the synchronous wheel fixing plate 82. The synchronous wheel and the fabric transfer timing belt are mounted on the synchronous wheel fixing plate. The front fixed plate, swing arm 83, and synchronous pulley fixed plate 82 form a parallelogram mechanism. When the synchronous pulley lifting cylinder 84 is activated, the fabric transfer synchronous belt 80 rises or falls and remains parallel to the sewing table surface. The outer side of the fabric transfer synchronous belt 80 is covered with a rubber layer. The synchronous pulley lifting cylinder 84 extends or retracts the swing arm 83 to swing the two swing arms 83, thereby achieving parallel lifting and lowering of the synchronous pulley and the fabric transfer synchronous belt 80. The rubber layer on the outer side of the fabric transfer synchronous belt 80 increases the friction between it and the fabric.

[0030] The correction mechanism also includes a controller, which is connected to the rear correction mechanism, the front correction mechanism, and the fabric sensor 40. The controller can correct the fabric deviation by controlling the actions of the rear and front correction mechanisms based on the signal from the fabric sensor 40.

[0031] Example 2

[0032] The rear correction mechanism in Example 2 is an active correction mechanism. Both the large correction wheel 36 and the small correction wheel 38 are rubber wheels, connected to a servo motor. The servo motor is connected to a controller. The radial plane of the large correction wheel forms a 10-degree angle with the fabric movement direction, and the radial plane of the small correction wheel forms a 35-degree angle with the fabric movement direction. The rest is the same as in Example 1. In this example, the rear correction mechanism is an active correction mechanism. The servo motor drives the large correction wheel 36 and the small correction wheel 38 to rotate on the fabric, thereby changing the movement direction to achieve correction. To avoid wrinkling of the fabric, the rotational linear speed of the large correction wheel 36 and the small correction wheel 38 is typically less than the movement speed of the fabric on the overlock sewing machine.

[0033] This invention features two correction mechanisms, one at the front and one at the rear. The front correction mechanism is located on the front side of the sewing table, while the rear correction mechanism is located on the right rear side of the sewing table (the side of the fabric to be sewn). Large and small baffles are also located on the side of the fabric to be sewn. These baffles guide and limit the position of the fabric, ensuring that the rear edge of the fabric is tightly against them during normal operation. In normal operation (i.e., when the fabric moves normally without correction), the small and large correction wheels in the small and large correction wheel assemblies rise and do not contact the fabric. The rear edge of the fabric (the sewing edge) moves to the left, tightly against the large and small baffles, driven by the overlock machine. Simultaneously, the synchronous belt on the front correction mechanism moves the front edge of the fabric to the left in sync. This ensures that both the front and rear sides of the fabric move smoothly and synchronously to the left, allowing the overlock machine to complete the sewing operation on the rear edge of the fabric. When the fabric sensor detects that the fabric has deviated forward (outward deviation), the controller lowers the small and large correction wheels to contact the fabric. Since both the small and large correction wheels are tilted backward on their left sides, their rolling motion on the fabric moves it backward, correcting the deviation. Simultaneously, the fabric shifting belt on the front correction mechanism decelerates and works in conjunction with the rear correction mechanism to return the deviated fabric to its normal position. The large and small fabric guards ensure that the fabric edges remain close to the guards during sewing, preventing over-correction. Conversely, when the fabric sensor detects backward deviation, the small and large correction wheels rise and no longer contact the fabric. The fabric shifting belt on the front correction mechanism accelerates, speeding up the forward movement of the fabric and returning it to its normal position. In this way, the front and rear correction mechanisms work together to ensure controllable and rapid fabric correction.

[0034] In addition to the embodiments described above, within the scope disclosed in the claims and specification of this invention, the technical features or technical data of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A correction mechanism for flat fabric pieces, disposed on a sewing table, wherein the rear center of the sewing table has a notch for accommodating an overlock sewing machine, and a small sewing table is disposed in front of the notch, characterized in that, The correction mechanism includes a rear correction mechanism and a front correction mechanism. The rear correction mechanism is located on the right rear side of the sewing table. The rear correction mechanism includes a small correction wheel assembly and a large correction wheel assembly for driving the fabric piece to change its direction of movement. The small correction wheel assembly is located above the small sewing table near the notch. The small correction wheel in the small correction wheel assembly is raised and lowered by connecting to a small wheel lifting cylinder. A small fabric baffle and a fabric sensor for detecting the fabric piece are provided on the small sewing table. The large correction wheel assembly is located above the sewing table to the right of the small correction wheel assembly. The large correction wheel in the large correction wheel assembly is raised and lowered by connecting to a large wheel lifting cylinder. The left sides of both the small and large correction wheels are tilted backward. A large fabric baffle is provided behind the large correction wheel. The front correction mechanism includes a fabric transfer timing belt for moving the fabric piece. The fabric transfer timing belt is located on the front side of the sewing table and is mounted on the fabric transfer timing belt lifting mechanism. The correction mechanism includes a controller, which is connected to the rear correction mechanism, the front correction mechanism, and the fabric sensor. The front correction mechanism is an active correction mechanism, which includes two parallel swing arms that are respectively connected to one end of the synchronous pulley lifting cylinder. One swing arm is equipped with a transmission synchronous belt assembly at both ends. The lower end of the transmission synchronous belt assembly is connected to the cloth transfer synchronous belt through a rotating shaft and a synchronous pulley, and the upper end is connected to a drive motor. When the synchronous pulley lifting cylinder is activated, the synchronous belt for moving the fabric rises or falls and remains parallel to the sewing table.

2. The correction mechanism for planar fabric pieces according to claim 1, characterized in that, The small correction wheel (38) is connected to the small wheel lifting cylinder (41) via the small wheel connecting arm (37) and the small wheel connecting plate (30). The small wheel lifting cylinder (41) is fixed to the bottom of the small slit platform (51) via the cylinder connecting bracket (31).

3. The correction mechanism for planar fabric pieces according to claim 1, characterized in that, The large correction wheel (36) is connected to the large wheel lifting cylinder (33) through the large wheel connecting arm (35) and the large wheel connecting plate (42). The large wheel lifting cylinder (33) is fixed on the movable rod of the large wheel front and rear telescopic cylinder (32). The large wheel front and rear telescopic cylinder (32) is fixed on the sewing table (5).

4. The correction mechanism for planar fabric pieces according to claim 1, characterized in that, The small baffle plate (39) is fixed on the small sewing platform (51). The rear baffle block (396) on the rear side of the small baffle plate (39) is fixed to the small sewing platform (51). The front side of the small baffle plate (39) is provided with an upper baffle plate. The upper baffle plate, the rear baffle block (396) and the small sewing platform (51) form a limiting channel for the fabric piece. The left side of the rear baffle block (396) is provided with a baffle extension section (391). The front edge of the upper baffle plate is rolled upward to form a front guide section (392) to facilitate the entry of the fabric piece. The front guide section (392) extends to the left to form an extension guide section (393). The middle part of the upper baffle plate is provided with a through groove (394) for accommodating the small correction wheel (38). The rear side of the through groove (394) is provided with a sensor hole (395) for installing the fabric piece sensor (40).

5. The correction mechanism for planar fabric pieces according to claim 1, characterized in that, The large baffle plate (34) is fixed on the sewing table (5). The large baffle plate (34) includes a rear baffle fixed to the sewing table (5) and an upper baffle connected above the rear baffle and extending forward. The rear baffle, the upper baffle and the sewing table form a limiting channel for the fabric piece. The front edge of the upper baffle is rolled upward to form a guide edge to facilitate the entry of the fabric piece.

6. The web-correcting mechanism for planar fabrics according to claim 1, characterized in that, A support column is provided on the left rear side of the sewing table. A shaft fixing plate (20) is provided on the support column. Two connecting arms (87) extend forward in parallel on the shaft fixing plate (20). A front fixing plate is provided at the front end of the two connecting arms (87). Two parallel swing arms (83) are rotatably connected to the two ends of the front fixing plate. The lower ends of the two swing arms (83) are hinged to the two ends of the synchronous wheel fixing plate (82). The synchronous wheel and the fabric shifting synchronous belt are set on the synchronous wheel fixing plate.

7. The correction mechanism for planar fabric pieces according to claim 6, characterized in that, The front fixing plate, the swing arm (83) and the synchronous wheel fixing plate (82) form a parallelogram mechanism, and the outer side of the cloth transfer synchronous belt (80) is provided with a rubber coating layer.

8. The web-correcting mechanism for planar fabrics according to any one of claims 1-7, characterized in that, The rear correction mechanism is a passive correction mechanism. The large correction wheel (36) and the small correction wheel (38) are both rubber wheels. The radial plane of the large correction wheel (36) has an angle of 8-12 degrees with the direction of fabric movement, and the radial plane of the small correction wheel (38) has an angle of 30-40 degrees with the direction of fabric movement.

9. The web-correcting mechanism for planar fabrics according to any one of claims 1-7, characterized in that, The rear correction mechanism is an active correction mechanism. The large correction wheel (36) and the small correction wheel (38) are both rubber wheels. The large correction wheel (36) and the small correction wheel (38) are both connected to a servo motor. The servo motor is connected to a controller. The radial plane of the large correction wheel has an angle of 8-12 degrees with the direction of fabric movement, and the radial plane of the small correction wheel has an angle of 30-40 degrees with the direction of fabric movement.

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