An accordion material feeding and heat sealing device for a flat-bottom bag making machine

Abstract

The present invention provides a flat-bottom bag making machine with a bellows material feeding and heat sealing device, comprising: a material feeding mechanism; a traction transition mechanism installed behind the material feeding mechanism; a traction calibration mechanism installed behind the traction transition mechanism; a servo traction and cutting mechanism installed below the traction calibration mechanism; and a heat sealing mechanism installed on one side of the servo traction and cutting mechanism. This flat-bottom bag making machine with a bellows material feeding and heat sealing device has a high degree of automation, integrating automatic unwinding, deviation correction, forming, tension adjustment, servo traction, color mark tracking, precise length measurement, flying knife cutting, and heat sealing with the main film, with high production efficiency and good quality of the produced bags.

Description

Technical Field

[0001] The present invention relates to the technical field of bag-making equipment, and particularly relates to a flat-bottom bag-making machine bellows material feeding and heat-sealing device. Background Art

[0002] The bellows material feeding and heat-sealing of a flat-bottom bag-making machine are key components for processing flat-bottom bags. The production efficiency of this device directly determines the production efficiency of flat-bottom bag-making. Currently, the common bellows material feeding and heat-sealing devices on the market are realized according to technological steps such as bellows feeding, forming, servo traction, cutting, the manipulator reciprocating to pick up the bellows material, and heat-sealing. Due to the reciprocating movement of the manipulator, the efficiency will be reduced a lot. The manipulator clamping the bellows material to pick it up and then releasing the bellows material after pulling it to the designated position will all take a certain amount of time. This way of feeding and heat-sealing the bellows material can no longer meet the needs of mass-producing flat-bottom bags at high speed. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention proposes a flat-bottom bag-making machine bellows material feeding and heat-sealing device, which is compact in structure and high in automation degree. It can realize the automatic unwinding, traction feeding, cutting of the bellows material, and the heat-sealing combination with the main film, with high production efficiency and good quality of the produced bags.

[0004] To achieve the above technical solution, a flat-bottom bag-making machine bellows material feeding and heat-sealing device provided by the present invention includes: a feeding mechanism; a traction transition mechanism installed behind the feeding mechanism; a traction calibration mechanism installed behind the traction transition mechanism; a servo traction and cutting mechanism installed below the traction calibration mechanism. The servo traction and cutting mechanism includes a guiding frame, on which a traction rubber roller is installed. A rubber roller driving device is installed on one side of the traction rubber roller. A linear guide rail is installed behind the traction rubber roller. A slider driving device is installed on the linear guide rail. A slider is installed on the linear guide rail and connected to the slider driving device. A circular knife is installed at the bottom of the slider. A left pressing plate cylinder and a right pressing plate cylinder are installed below the linear guide rail. Pressing plates are installed on the telescopic shafts of the left pressing plate cylinder and the right pressing plate cylinder. A support plate is arranged below the pressing plates. There is a certain gap between the pressing plates and the support plate. The circular knife is arranged flush with the rear end of the support plate; a heat-sealing mechanism installed on one side of the servo traction and cutting mechanism. The heat-sealing mechanism includes a heat-sealing frame. A support seat is installed at the top of the heat-sealing frame and arranged downward. A heat-sealing iron is arranged upward and facing the bottom of the support seat at the bottom of the support seat. A hot knife driving device is installed at the bottom of the heat-sealing iron. The main film passes longitudinally between the support seat and the heat-sealing iron, and the bellows material enters between the support seat and the heat-sealing iron horizontally from the servo traction and cutting mechanism.

[0005] In the above technical solution, during actual operation, the bellows material roll is placed on the feeding mechanism. The feeding mechanism stably feeds the bellows material. After passing through the transition and calibration of the traction transition mechanism and the traction calibration mechanism, it is conveyed to the traction rubber roller in the servo traction cutting mechanism. Driven by the rubber roller driving device, the traction rubber roller laterally conveys the bellows material between the support seat and the heat-sealing iron. And by tracking the color mark on the bellows material, the feeding length of the bellows material is determined. When the bellows material is fed in place, the left pressing plate cylinder and the right pressing plate cylinder drive the pressing plate to press down, pressing the bellows material on the support plate. Then the slider driving device drives the slider to drive the round knife to move longitudinally along the linear guide rail, and the bellows material is neatly cut along the pressing plate by the round knife. The cut bellows material falls onto the main film passing longitudinally between the support seat and the heat-sealing iron. The heat-sealing iron driving device drives the heat-sealing iron to move upward, pressing the bellows material and the main film on the support seat to realize the heat-sealing of the bellows material and the main film. Compared with the traditional feeding method, this feeding method directly conveys the material to the designated position through servo traction, greatly saving the feeding time and improving the production efficiency.

[0006] Preferably, the feeding mechanism includes a feeding frame. The feeding roller is installed on the feeding frame. The deviation rectifier is arranged below the feeding roller. The forming support plate is installed on the feeding frame and behind the deviation rectifier. A plurality of forming pressure rollers are installed above the forming support plate. Two traction rollers arranged in parallel vertically and closely are installed at the end of the forming support plate. The traction motor is installed on the feeding frame and connected to the traction roller. A tension swing arm is installed behind the traction roller. A plurality of tension adjusting rollers are installed on the tension swing arm. The potentiometer is installed between the traction roller and the tension swing arm. The potentiometer is electrically connected to the tension swing arm. A plurality of guide rollers are installed side by side above the tension adjusting rollers. The bellows material roll is placed on the feeding roller. Under the traction of the traction roller, it first passes through the deviation rectifier for deviation rectification and then enters the forming support plate. After being processed by the forming pressure rollers installed above the forming support plate, bellows patterns are formed on the surface. Then it enters the traction roller. The traction motor drives the traction roller to rotate to provide power for the backward movement of the bellows material. And it enters the tension adjusting rollers. The tension swing arm will swing up and down with the traction of the bellows material, driving the potentiometer swing arm to swing up and down. The potentiometer will output signals in real time with the change of position, controlling the speed of the traction motor to realize the stable output of the bellows material and keep the tension of the bellows material stable during the conveying process.

[0007] Preferably, the traction transition mechanism includes a transition support plate installed behind the feeding mechanism. A transition guide roller is installed between the transition support plate and the feeding mechanism. After the tension of the bellows material is adjusted by the tension adjusting rollers in the feeding mechanism, it enters the transition support plate through the transition guide roller to further keep the tension of the bellows material stable during the conveying process.

[0008] Preferably, the traction calibration mechanism includes a servo traction machine installed at the tail of the transition pallet. A tension adjustment floating roller is installed behind the servo traction machine. A color mark locator is installed behind the tension adjustment floating roller. An upper direction-changing guide roller is installed behind the color mark locator, and a lower direction-changing guide roller is installed directly below the upper direction-changing guide roller. Among them, the servo traction machine is used to provide power for the traction of the bellows material. The tension adjustment floating roller is used to further adjust the tension stability of the bellows material during transportation. The color mark locator is used to mark a color mark on the surface of the bellows material to facilitate the precise length determination of the subsequent bellows material. The upper direction-changing guide roller and the lower direction-changing guide roller are used to reverse the conveying direction of the bellows material, realizing the upper and lower layer structure design, which can reduce the overall length of the equipment, make the equipment more compact as a whole, and reduce the floor area.

[0009] Preferably, the rubber roller driving device includes a first servo motor, a first synchronous pulley, and a first synchronous belt. Among them, the first servo motor is installed on the guiding frame, the first synchronous pulley is installed on the output shaft of the first servo motor, and the first synchronous pulley is connected to the end shaft of the traction rubber roller through the first synchronous belt. During actual operation, the traction rubber roller is accurately driven to move by the first servo motor, and the first servo motor rotates accurately according to the color mark on the bellows material to achieve the accurate length determination of the bellows material.

[0010] Preferably, the slider driving device includes a second servo motor, a second synchronous pulley, and a second synchronous belt. Among them, the second servo motor is installed on the guiding frame, the second synchronous pulley is installed on the output shaft of the second servo motor, the synchronous pulley is installed on the guiding frame and on one side of the second synchronous pulley, the second synchronous pulley is connected to the synchronous pulley through the second synchronous belt, and the slider is installed on the second synchronous belt and contacts the linear guide rail. During the actual working process, the second synchronous belt is accurately driven to move longitudinally by the second servo motor, and then the slider and the circular knife installed on the slider can be driven to move precisely to achieve the neat cutting of the bellows material.

[0011] Preferably, the hot knife driving device includes a hot knife driving motor, and an eccentric shaft is installed on the output shaft of the hot knife driving motor. The top of the eccentric shaft is fixedly connected to the bottom of the heat-sealing hot knife. During actual operation, the hot knife driving motor drives the eccentric shaft to rotate, and then the heat-sealing hot knife can be driven to move up and down periodically.

[0012] The beneficial effects of a flat-bottom bag making machine bellows material feeding and heat-sealing device provided by the present invention are as follows:

[0013] 1) The flat-bottom bag making machine bellows material feeding and heat-sealing device has a high degree of automation, integrating functions such as automatic unwinding, deviation correction, forming, tension adjustment, servo traction, color mark tracking, precise length determination, flying knife cutting, and heat-sealing with the main film. It has high production efficiency and the produced bags have good quality.

[0014] 2) The bellows material feeding and heat-sealing device of this flat-bottom bag making machine can ensure stable tension during the overall transportation of the bellows material by setting multiple servo traction and tension adjustment devices. Moreover, the feeding efficiency is high, and there will be no feeding deviation phenomenon. The heat-sealing method is adopted to realize the combination between the bellows material and the main film. Compared with the traditional feeding method, this feeding method directly feeds the material to the designated position through servo traction, greatly saving the feeding time and improving the production efficiency.

[0015] 3) The bellows material feeding and heat-sealing device of this flat-bottom bag making machine adopts an upper and lower layer structure design, which can reduce the overall length of the equipment, make the overall equipment more compact, and reduce the floor area. Brief Description of the Drawings

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the present invention.

[0017] Figure 2 It is a three-dimensional structure schematic diagram of the unwinding mechanism in the present invention.

[0018] Figure 3 It is a three-dimensional structure schematic diagram of the traction transition mechanism and the traction calibration mechanism in the present invention.

[0019] Figure 4 It is a three-dimensional structure schematic diagram of the servo traction and material cutting mechanism in the present invention Figure Ⅰ .

[0020] Figure 5 It is a three-dimensional structure schematic diagram of the servo traction and material cutting mechanism in the present invention Figure Ⅱ .

[0021] Figure 6 It is a three-dimensional structure schematic diagram of the heat-sealing mechanism in the present invention.

[0022] Figure 7 It is a schematic diagram of the feeding traction principle of the present invention.

[0023] In the figure: 1. Feeding mechanism; 11. Feeding frame; 12. Feeding roller; 13. Deviation rectifier; 14. Forming support plate; 15. Forming pressure roller; 16. Traction roller; 17. Traction motor; 18. Potentiometer; 19. Tension swing arm; 110. Tension adjusting roller; 111. Guide roller; 2. Traction transition mechanism; 21. Transition guide roller; 22. Transition support plate; 3. Traction calibration mechanism; 31. Servo traction machine; 32. Tension adjusting floating roller; 33. Color mark positioner; 34. Upper direction-changing guide rod; 35. Lower direction-changing guide rod; 4. Servo traction and cutting mechanism; 41. Guide frame; 42. Traction rubber roller; 43. First servo motor; 44. First synchronous pulley; 45. First synchronous belt; 46. Linear guide rail; 47. Slide block; 48. Second servo motor; 49. Second synchronous pulley; 410. Second synchronous belt; 411. Circular knife; 412. Left pressing plate cylinder; 413. Right pressing plate cylinder; 414. Pressing plate; 415. Support plate; 5. Heat sealing mechanism; 51. Heat sealing frame; 52. Support seat; 53. Heat sealing iron; 54. Eccentric shaft; 55. Iron driving motor; 6. Bellows material; 7. Main film. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0025] Embodiment: A bellows material feeding and heat sealing device for a flat-bottom bag making machine.

[0026] Referring to Figures 1 to 7 As shown, a bellows material feeding and heat sealing device for a flat-bottom bag making machine includes:

[0027] The feeding mechanism 1, the feeding mechanism 1 includes a feeding frame 11, a feeding roller 12 is installed on the feeding frame 11, a deviation rectifier 13 is arranged below the feeding roller 12, a forming support plate 14 is installed on the feeding frame 11 and behind the deviation rectifier 13, two sets of forming pressure rollers 15 are installed above the forming support plate 14, two traction rollers 16 arranged in parallel and closely contacting each other up and down are installed at the end of the forming support plate 14, a traction motor 17 is installed on the feeding frame 11 and connected to the traction rollers 16, a tension swing arm 19 is installed behind the traction rollers 16, a plurality of tension adjusting rollers 110 are installed on the tension swing arm 19, a potentiometer 18 is installed between the traction rollers 16 and the tension swing arm 19, the potentiometer 18 is electrically connected to the tension swing arm 19 and the traction motor 17, and a plurality of guide rollers 111 are installed side by side above the tension adjusting rollers 110; During actual operation, the bellows material roll is placed on the feeding roller 12. Under the traction of the traction rollers 16, it first passes through the deviation rectifier 13 for deviation rectification and then enters the forming support plate 14. After being processed by the forming pressure rollers 15 installed above the forming support plate 14, bellows patterns are formed on the surface, and then it enters the traction rollers 16. The traction motor 17 drives the traction rollers 16 to rotate to provide power for the backward movement of the bellows material 6, and it enters the tension adjusting rollers 110. The tension swing arm 19 will swing up and down with the traction of the bellows material 6, driving the swing arm of the potentiometer 18 to swing up and down. The potentiometer 18 will output signals in real time with the change of position, controlling the speed of the traction motor 17, realizing the stable output of the bellows material 6, and maintaining the stable tension of the bellows material 6 during the conveying process;

[0028] The traction transition mechanism 2 installed behind the feeding mechanism 1, the traction transition mechanism 2 includes a transition support plate 22 installed behind the feeding mechanism 1, a transition guide roller 21 is installed between the transition support plate 22 and the guide rollers 111 of the feeding mechanism 1. After the tension of the bellows material 6 is adjusted by the tension adjusting rollers 110 in the feeding mechanism 1, it enters the transition support plate 22 through the transition guide roller 21, further maintaining the stable tension of the bellows material 6 during the conveying process;

[0029] The traction calibration mechanism 3 is installed behind the traction transition mechanism 2. The traction calibration mechanism 3 includes a servo traction machine 31 installed at the tail of the transition support plate 22. A tension adjustment floating roller 32 is installed behind the servo traction machine 31. A color mark locator 33 is installed behind the tension adjustment floating roller 32. An upper direction-changing guide roller 34 is installed behind the color mark locator 33. A lower direction-changing guide roller 35 is installed directly below the upper direction-changing guide roller 34. Among them, the servo traction machine 31 is used to provide power for the traction of the bellows material 6. The tension adjustment floating roller 32 is used to further adjust the tension stability of the bellows material 6 during the conveying process. The color mark locator 33 is used to mark a color mark on the surface of the bellows material 6 to facilitate the subsequent precise length determination of the bellows material 6. The upper direction-changing guide roller 34 and the lower direction-changing guide roller 35 are used to reverse the conveying direction of the bellows material 6, realizing the structure design of the upper and lower layers, which can reduce the overall length of the equipment, make the equipment more compact as a whole, and reduce the floor area.

[0030] The servo traction and blanking mechanism 4 is installed below the traction calibration mechanism 3. The servo traction and blanking mechanism 4 includes a guiding frame 41. A traction rubber roller 42 is installed on the guiding frame 41. A rubber roller driving device is installed on one side of the traction rubber roller 42. The rubber roller driving device includes a first servo motor 43, a first synchronous pulley 44 and a first synchronous belt 45. Among them, the first servo motor 43 is installed on the guiding frame 41, the first synchronous pulley 44 is installed on the output shaft of the first servo motor 43, and the first synchronous pulley 44 is connected to the end shaft of the traction rubber roller 42 through the first synchronous belt 45. During actual work, the first servo motor 43 drives the traction rubber roller 42 to move accurately, and the first servo motor 43 rotates accurately according to the color mark on the bellows material 6 to achieve accurate length measurement of the bellows material 6. A linear guide 46 is installed behind the traction rubber roller 42. A slider driving device is installed on the linear guide 46. A slider 47 is installed on the linear guide 46 and is connected to the slider driving device. A circular knife 411 is installed at the bottom of the slider 47. The slider driving device includes a second servo motor 48, a second synchronous pulley 49 and a second synchronous belt 410. Among them, the second servo motor 48 is installed on the guiding frame 41, the second synchronous pulley 49 is installed on the output shaft of the second servo motor 48, a synchronous pulley is installed on the guiding frame 41 and is located on one side of the second synchronous pulley 49, and the second synchronous pulley 49 is connected to the synchronous pulley through the second synchronous belt 410. The slider 47 is installed on the second synchronous belt 410 and is in contact with the linear guide 46. During the actual working process, the second servo motor 48 drives the second synchronous belt 410 to move longitudinally accurately, and then the slider 47 and the circular knife 411 installed on the slider 47 can be driven to move precisely to achieve neat cutting of the bellows material 6. A left pressing plate cylinder 412 and a right pressing plate cylinder 413 are installed below the linear guide 46. Pressing plates 414 are installed on the telescopic shafts of the left pressing plate cylinder 412 and the right pressing plate cylinder 413. A supporting plate 415 is arranged below the pressing plates 414. A certain gap is maintained between the pressing plates 414 and the supporting plate 415. The circular knife 411 is flush with the rear end of the supporting plate 415. During actual work, when the bellows material 6 is fed in place, the left pressing plate cylinder 412 and the right pressing plate cylinder 413 drive the pressing plates 414 to press down, press the bellows material 6 on the supporting plate 415, and then the slider driving device drives the slider 47 to drive the circular knife 411 to move longitudinally along the linear guide 46, and the bellows material 6 is neatly cut along the pressing plates 414 by the circular knife 411;

[0031] The heat-sealing mechanism 5 is installed on one side of the servo traction and blanking mechanism 4. The heat-sealing mechanism 5 includes a heat-sealing machine frame 51. At the top of the heat-sealing machine frame 51, a downwardly arranged support seat 52 is installed. At the bottom of the support seat 52, a heat-sealing iron 53 is arranged facing the bottom of the support seat 52 upward. At the bottom of the heat-sealing iron 53, a cutter driving device is arranged. The cutter driving device includes a cutter driving motor 55. An eccentric shaft 54 is installed on the output shaft of the cutter driving motor 55. The top of the eccentric shaft 54 is fixedly connected to the bottom of the heat-sealing iron 53. The main film 7 longitudinally passes between the support seat 52 and the heat-sealing iron 53. The accordion material 6 transversely enters between the support seat 52 and the heat-sealing iron 53 from the servo traction and blanking mechanism 4. During actual operation, the cutter driving motor 55 drives the eccentric shaft 54 to rotate, and then the heat-sealing iron 53 can be driven to move up and down periodically, realizing the fitting of the main film 7 and the accordion material 6.

[0032] In the above technical solution, during actual operation, the accordion material roll is placed on the unwinding roller 12. Under the traction of the traction roller 16, it first passes through the deviation rectifier 13 for deviation rectification and then enters the forming support plate 14. After being processed by the forming pressing roller 15 installed above the forming support plate 14, accordion patterns are formed on the surface, and then it enters the traction roller 16. The traction motor 17 drives the traction roller 16 to rotate to provide power for the backward movement of the accordion material 6, and it enters the tension adjusting roller 110. The tension swing arm 19 will swing up and down along with the traction of the accordion material 6, driving the swing arm of the potentiometer 18 to swing up and down. The potentiometer 18 will output signals in real time with the change of position, controlling the speed of the traction motor 17 to realize the stable output of the accordion material 6 and keeping the tension of the accordion material 6 stable during the conveying process. Then, after passing through the traction transition mechanism 2, it enters the traction calibration mechanism 3. The traction calibration mechanism 3 adjusts the tension and calibrates the accordion material 6 during transmission. The upper deflection guide roller 34 and the lower deflection guide roller 35 are used to reverse the conveying direction of the accordion material 6, and it is conveyed to the traction rubber roller 42 in the servo traction and blanking mechanism 4. The traction rubber roller 42 drives the accordion material 6 to be conveyed transversely between the support seat 52 and the heat-sealing iron 53 under the drive of the rubber roller driving device, and the feeding length of the accordion material 6 is determined by tracking the color mark on the accordion material 6. When the accordion material 6 is fed in place, the left pressing plate cylinder 412 and the right pressing plate cylinder 413 drive the pressing plate 414 to press down, pressing the accordion material 6 on the support plate 415. Then, the slider driving device drives the slider 47 to drive the circular knife 411 to move longitudinally along the linear guide rail 46, and the accordion material 6 is neatly cut along the pressing plate 414 by the circular knife 411. The cut accordion material 6 falls onto the main film 7 longitudinally passing between the support seat 52 and the heat-sealing iron 53. The cutter driving device drives the heat-sealing iron 53 to move upward, pressing the accordion material 6 and the main film 7 on the support seat 52 to realize the heat-sealing of the accordion material 6 and the main film 7. Compared with the traditional feeding method, the heat-sealing method has a better combination effect between the accordion material 6 and the main film 7 and higher production efficiency.

[0033] The automaticity of the bellows material feeding and heat sealing device of this flat-bottom bag making machine is high. It integrates the automatic unwinding, deviation correction, forming, tension adjustment, servo traction, color mark tracking, precise length measurement, flying knife cutting and heat sealing with the main film of the bellows material. It has high production efficiency and the produced bags have good quality. By setting multiple servo traction and tension adjustment devices, the bellows material feeding and heat sealing device of this flat-bottom bag making machine can ensure stable tension during the overall conveying process of the bellows material, with high feeding efficiency and no feeding deviation phenomenon. The combination between the bellows material and the main film is realized by heat sealing, which has better effect and higher production efficiency compared with the traditional feeding method. The bellows material feeding and heat sealing device of this flat-bottom bag making machine adopts an upper and lower layer structure design, which can reduce the overall length of the equipment, make the equipment more compact as a whole and reduce the floor area.

[0034] The above are the preferred embodiments of the present invention, but the present invention should not be limited to the content disclosed in this embodiment and the drawings. Therefore, all equivalent or modified implementations completed without departing from the spirit disclosed by the present invention fall within the protection scope of the present invention.

Claims

1. A flat-bottom bag making machine bellows material feeding and heat sealing device, characterized in that Including: A feeding mechanism; A traction transition mechanism installed behind the feeding mechanism; A traction calibration mechanism installed behind the traction transition mechanism; A servo traction and cutting mechanism installed below the traction calibration mechanism. The servo traction and cutting mechanism includes a guiding frame. A traction rubber roller is installed on the guiding frame. A rubber roller driving device is installed on one side of the traction rubber roller. A linear guide rail is installed behind the traction rubber roller. A slider driving device is installed on the linear guide rail. The slider is installed on the linear guide rail and connected to the slider driving device. A circular knife is installed at the bottom of the slider. A left pressing plate cylinder and a right pressing plate cylinder are installed below the linear guide rail. Pressing plates are installed on the telescopic shafts of the left pressing plate cylinder and the right pressing plate cylinder. A supporting plate is arranged below the pressing plates. A certain gap is maintained between the pressing plates and the supporting plate. The circular knife is flush with the rear end of the supporting plate; A heat sealing mechanism installed on one side of the servo traction and cutting mechanism. The heat sealing mechanism includes a heat sealing frame. A downwardly arranged supporting seat is installed on the top of the heat sealing frame. A heat sealing iron is arranged at the bottom of the supporting seat facing upwardly and directly opposite to the bottom of the supporting seat. A hot knife driving device is arranged at the bottom of the heat sealing iron. The main film passes longitudinally between the supporting seat and the heat sealing iron. The accordion material enters between the supporting seat and the heat sealing iron horizontally from the servo traction and cutting mechanism, The feeding mechanism includes a feeding frame. A feeding roller is installed on the feeding frame. A deviation rectifier is arranged below the feeding roller. A forming support plate is installed on the feeding frame and behind the deviation rectifier. A plurality of forming pressing rollers are installed above the forming support plate. Two parallel and closely arranged traction rollers are installed at the end of the forming support plate. A traction motor is installed on the feeding frame and connected to the traction rollers. A tension swing arm is installed behind the traction rollers. A plurality of tension adjusting rollers are installed on the tension swing arm. A potentiometer is installed between the traction rollers and the tension swing arm. The potentiometer is electrically connected to the tension swing arm. A plurality of guide rollers are arranged side by side above the tension adjusting rollers, The traction transition mechanism includes a transition support plate installed behind the feeding mechanism. Transition guide rollers are installed between the transition support plate and the feeding mechanism, The traction calibration mechanism includes a servo traction machine installed at the tail of the transition support plate. A tension adjusting floating roller is installed behind the servo traction machine. A color mark locator is installed behind the tension adjusting floating roller. An upper direction-changing guiding roller is installed behind the color mark locator. A lower direction-changing guiding roller is installed directly below the upper direction-changing guiding roller.

Images