Online printing device for bag making machine

Abstract

The present invention discloses an online printing device for a bag making machine, comprising a reeling mechanism and a reeling mechanism and a packaging bag film therebetween. The reeling mechanism and the reeling mechanism are provided with a printing device, comprising an upper roller and a printing roller located below the upper roller, the printing roller being able to move along its axial direction, and an adjustment mechanism for controlling the axial movement of the printing roller. The printing roller is able to move along its axial direction, so that when printing misalignment is found, correction can be made by controlling the fine adjustment of the lateral position of each printing roller, which is convenient and quick. By arranging a shift fork in the printing device, the position of the printing roller can be conveniently shifted and fixed. The shift fork cooperates with the linear bearing through two guide shafts, which can greatly reduce the sliding resistance and has high precision, facilitating accurate position adjustment of the printing roller. The shift fork can be precisely fine-tuned by adjusting the cylindrical cam groove on the cylinder, and the rotational torque of the adjustment cylinder is used to drive the shift fork to move.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to an online printing device for a bag making machine. Background Art

[0002] Bag-making machines are machines that produce a variety of plastic or other material packaging bags. They process bags of various sizes, thicknesses, and specifications, with plastic or other materials generally being the primary product. With the continuous improvement of living standards in China, the plastic flexible packaging industry has seen boundless business opportunities, and plastic flexible packaging bag-making machines have also flourished. To enhance the aesthetics, add selling points, and improve product recognition, businesses are increasingly designing the outer packaging and the product itself, often by incorporating patterns or fonts into the outer packaging to increase recognition and attract customers.

[0003] In the prior art, a roll toilet paper printing device disclosed in application number CN200920171370.6, or an online printing device for printing patterns on sanitary napkins disclosed in application number CN201410223924.8, both use a pair of upper rollers and a printing roller arranged in an upper and lower relative manner to print the product surface online. Their defects are: since the prints on the printing rollers are all fixedly set, if the printed pattern deviates or is misaligned during printing due to insufficient assembly accuracy, it is extremely difficult to adjust. Usually, it is necessary to stop the machine, remove the printing roller, and reinstall and calibrate it before it can be started again. Moreover, due to long-term production of the equipment, the product and the printing roller may be offset and misaligned, which is not convenient for online adjustment. This causes many inconveniences and leads to reduced production efficiency and product quality. Secondly, each printing roller in the above-mentioned prior art can only print a single color. For patterns with rich colors, multiple printing devices need to be set, which not only increases the equipment cost but also reduces the printing efficiency.

[0004] In view of the above, it is necessary to propose an online printing device for a bag making machine to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems and to provide an online printing device for a bag making machine. When the printing of the product is offset, the printing roller can be adjusted online in time to improve the printing quality of the product.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: an online printing device for a bag making machine, comprising a unwinding mechanism and a rewinding mechanism and a packaging bag film therebetween, at least one group of printing devices is provided between the unwinding mechanism and the rewinding mechanism, the printing device comprising an upper roller and a printing roller located below the upper roller, a pattern relief plate for printing being provided on the upper surface of the printing roller, the printing roller being able to move along its axial direction, and also comprising an adjustment mechanism for controlling the axial movement of the printing roller.

[0007] Furthermore, the printing device is arranged in the outer frame, and a printing shaft is rotatably connected inside the outer frame. The printing device includes a printing roller, which is sleeved on the printing shaft. The side of the printing shaft is provided with a convex key along the axial direction, and the printing roller is provided with a key groove corresponding to it. The printing roller can be driven to rotate by the printing shaft and can slide along its axial direction; the printing device is provided with an outer frame, and the outer frame is provided with a driving motor for driving the printing shaft to rotate.

[0008] Furthermore, a driving ring groove is provided on one end face of the printing roller, and the adjustment mechanism includes a shift fork, the fork mouth of the shift fork cooperates with the driving ring groove, and the driving ring groove is inserted from the fork mouth of the shift fork so that the driving ring groove and the fork mouth are rotatably connected. The shift fork can move along the axial direction of the printing roller and drive the printing roller to move.

[0009] Furthermore, the outer frame is provided with at least two parallel guide shafts, the guide shafts are parallel to the printing shaft, the shift fork is slidably connected to the two guide shafts away from the fork end, and linear bearings are provided at the two sliding connections of the shift fork.

[0010] Furthermore, the adjustment mechanism also includes a driving mechanism for the shift fork, which includes an adjusting cylinder and a fixed shaft. Both ends of the fixed shaft are fixedly arranged on the outer frame and parallel to the printing shaft. The adjusting cylinder is rotatably connected to the fixed shaft, and a cylindrical cam groove is provided on the cylindrical surface of the adjusting cylinder. A cam key is provided on the shift fork to cooperate with the cylindrical cam groove. When the adjusting cylinder rotates, the cylindrical cam groove and the cam key are used to push the shift fork to fine-tune the movement.

[0011] Furthermore, a worm wheel is fixedly provided on one end face of the adjusting cylinder, a worm is rotatably connected to the side wall of the outer frame, the worm wheel is meshed with the worm, and an adjusting hand wheel is provided on one end of the worm extending out of the outer frame.

[0012] Furthermore, the printing devices are provided in multiple groups in the outer frame; the printing rollers in each group of printing devices are immersed in the ink hopper, and a hopper lifting cylinder is provided below the ink hopper.

[0013] Furthermore, a plurality of partitions are provided in the ink hopper, and the partitions divide the ink hopper into a plurality of compartments, and a printing roller is correspondingly provided in each compartment.

[0014] Furthermore, a lifting cylinder 2 is installed above the upper roller to control the lifting of the upper roller.

[0015] Furthermore, a scraper is provided in the outer frame, and the scraper cooperates with the roller surface of the printing roller.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The printing roller of this device has a high-precision adjustment function. Since the printing roller can move along its axial direction, when printing misalignment is found, it can be corrected by controlling the fine adjustment of the lateral position of each printing roller, which is convenient and quick.

[0018] 2. By arranging a shift fork in the printing device, the position of the printing roller can be conveniently shifted and fixed.

[0019] 3. The shift fork cooperates with the linear bearing through two guide shafts, which can greatly reduce the sliding resistance and has high precision, making it easy to accurately adjust the position of the printing roller.

[0020] 4. The shift fork can be precisely fine-tuned by adjusting the cylindrical cam groove on the cylinder. The rotation torque of the adjusting cylinder is used to drive the shift fork to move, and the one-way transmission principle of the worm gear is used to automatically limit the shift fork after adjustment, thereby limiting the axial position of the printing roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of an online printing device for a bag making machine according to the present invention;

[0022] Figure 2 This is an axonometric diagram of an online printing device for a bag making machine according to the present invention;

[0023] Figure 3 This is one of the exploded views of the online printing device of the present invention;

[0024] Figure 4 This is the second exploded view of the online printing device of the present invention;

[0025] In the picture:

[0026] 1. Unwinding mechanism; 2. Rewinding mechanism; 3. Packaging bag film; 4. Printing device; 5. Upper roller; 6. Printing roller; 7. Adjusting mechanism; 8. External frame; 9. Printing shaft; 10. Key; 11. Keyway; 12. Driving motor; 13. Driving ring groove; 14. Shift fork; 15. Fork mouth; 16. Guide shaft; 17. Adjusting cylinder; 18. Fixed shaft; 19. Cylindrical cam groove; 20. Cam key; 21. Worm gear; 22. Worm; 23. Adjusting hand wheel; 24. Ink hopper; 25. Hopper lifting cylinder; 26. Partition; 27. Lifting cylinder 2; 28. Scraper. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example 1:

[0028] An online printing device for a bag making machine, such as Figure 1 As shown, it includes a unwinding mechanism 1 and a rewinding mechanism 2 and a packaging bag film 3 therebetween. At least one printing device 4 is provided between the unwinding mechanism 1 and the rewinding mechanism 2. In actual production, both ends of the packaging bag film 3 are wound on the unwinding mechanism 1 and the rewinding mechanism 2. When the rewinding mechanism 2 is in operation, it can pull the packaging bag film 3 through the printing device 4, thereby realizing online printing on the packaging bag film 3. The printing device 4 includes an upper roller 5 and a printing roller 6 located below the upper roller 5. The upper surface of the printing roller 6 is provided with a pattern relief for printing. A lifting cylinder 27 for controlling the lifting of the upper roller 5 is installed above the upper roller 5. The upper roller 5 can move up and down under the drive of the lifting cylinder 27, thereby controlling the force of the upper roller 5 pressing on the printing roller 6. Since the packaging bag film 3 passes between the two, the printing force on the surface of the packaging bag film 3 is adjusted. In fact, the upper roller 5 can always be set The upper roller 5 is made of a soft material, which is beneficial to improving the clarity of printing. An ink hopper 24 is provided below the printing roller 6, and a hopper lifting cylinder 25 is provided below the ink hopper 24, so that the side of the printing roller 6 can be immersed in the ink hopper 24 when it is rotated to the bottom. When it is rotated out again, the surface of the printing roller 6 is covered with ink to achieve continuous printing. When the printing roller 6 is rotated out of the ink, the ink on the surface of the printing roller 6 is evenly scraped by the scraper 28 to make the ink thickness uniform and the printing effect good. In actual use, in order to facilitate the correction of the problem of pattern printing offset on the packaging bag film 3, the present device arranges the printing roller 6 into a structure that can move along its axial direction. The range of movement of the printing roller 6 on the printing shaft 9 constitutes the range in which the present device can adjust the printing pattern, thereby coping with the problem of pattern printing deviation. When the present device is used, the displacement of the printing roller 6 along the axial direction is controlled by the adjustment mechanism 7. Example 2:

[0029] like Figure 2As shown, the printing device 4 of the present device is arranged in the outer frame 8, and the outer frame 8 is rotatably connected with a printing shaft 9. The outer frame 8 is provided with a drive motor 12 for driving the printing shaft 9 to rotate. The rotation speed of the drive motor 12 is controlled by the drive motor 12, so that the circumferential roller speed of the printing roller matches the moving speed of the packaging bag film 3. The printing device 4 includes a printing roller 6, which is sleeved on the printing shaft 9. The side of the printing shaft 9 is provided with a convex key 10 along the axial direction, and the printing roller 6 is provided with a key groove 11 corresponding thereto. As shown in the figure, when the printing roller 6 is sleeved on the printing shaft 9, the convex key 10 is protruded from the side and snapped into the key groove 11, so that the printing roller 6 can rotate with the drive of the printing shaft 9. At the same time, since the convex key 10 and the key groove 11 do not limit the axial movement of the printing roller 6, the printing roller 6 can also move laterally along the printing shaft 9, so that when the printed pattern on the product is offset, it can be adjusted laterally.

[0030] In order to realize that the printing roller 6 can be moved laterally during printing, Figure 3 As shown, a drive ring groove 13 is fixedly provided on one end face of the printing roller 6. The drive ring groove 13 is a structure with a circle of circular grooves on the circumferential side. The adjusting mechanism 7 includes a shift fork 14. The fork 15 of the shift fork 14 cooperates with the drive ring groove 13. The drive ring groove 13 is inserted through the fork 15 of the shift fork 14. The opening diameter of the fork 15 of the shift fork 14 cooperates with the diameter of the drive ring groove 13, and the thickness of the shift fork 14 should be adapted to the width of the drive ring groove 13 to avoid a large clearance, and the printing roller should be able to rotate freely when the fork 15 is inserted into the drive ring groove 13. It can be understood that balls can be provided on both sides of the fork 15 to transform the cooperation between the shift fork 14 and the drive ring groove 13 from sliding friction to rolling friction, thereby greatly reducing friction resistance and helping to improve control accuracy. Therefore, when in use, the printing roller 6 can be driven to move laterally by shifting the shift fork 14, and the rotation of the printing roller 6 is not affected.

[0031] Furthermore, in order to ensure that the fork 14 can move laterally stably, at least two parallel guide shafts 16 are provided on the outer frame 8. The guide shaft 16 is parallel to the printing shaft 9. The end of the fork 14 away from the fork mouth 15 is slidingly connected to the two guide shafts 16. The fork 14 is provided with linear bearings at the two sliding connections. The two guide shafts 16 can also use linear bearings, thereby improving the smoothness of the movement of the fork 14. Example 3:

[0032] In order to facilitate the movement of the shift fork 14 and to limit the position of the shift fork 14, the device is provided with a driving mechanism for the shift fork 14, such as Figure 3 、 Figure 4As shown, the mechanism includes an adjusting cylinder 17 and a fixed shaft 18, both ends of the fixed shaft 18 are fixedly arranged on the outer frame 8 and made parallel to the printing shaft 9, the adjusting cylinder 17 is rotatably connected to the fixed shaft 18, and a bearing for easy rotation can be set between the adjusting cylinder 17 and the fixed shaft 18, and a worm gear 21 is fixedly provided on the end face of one side of the adjusting cylinder 17, so the adjusting cylinder 17 can be driven to rotate by driving the worm gear 21, and due to the unidirectionality of the worm gear 21 and the worm 22, the angle of the adjusting cylinder 17 can also be locked by the worm gear 21 and the worm 22; a worm gear 22 is rotatably connected to the side wall of the outer frame 8, and the worm gear 21 is meshed with the worm gear 22. An adjusting handwheel 23 is provided at one end of the worm gear 22 extending out of the outer frame 8, and the internal adjusting cylinder 17 can be conveniently controlled to rotate at a fixed angle by the adjusting handwheel 23 extending out of the side wall of the outer frame 8.

[0033] Furthermore, a cylindrical cam groove 19 is provided on the cylindrical surface of the adjusting cylinder 17. The cylindrical cam groove 19 is spirally wound around the outer circumference of the adjusting cylinder 17 for at least one circle. It can be understood that as the number of circles increases, the adjustment of the shift fork 14 becomes more subtle and precise. Figure 4 As shown, a cam key 20 is provided on the shift fork 14 to cooperate with the cylindrical cam groove 19. The diameter of the cam key 20 cooperates with the width of the cylindrical cam groove 19, and a large clearance should be avoided. During assembly, the cam key 20 is inserted into the cylindrical cam groove 19 to form a cam fit. When the adjusting cylinder 17 rotates, the cylindrical cam groove 19 and the cam key 20 cooperate to push the shift fork 14 to fine-tune the movement. In this way, when the adjusting cylinder 17 rotates, its rotational torque is converted through the cam mechanism to form a driving force that pushes the shift fork 14 to move laterally, and the structure of the cam fit can also limit the position of the shift fork 14, that is, to control the position of the printing roller 6. Example 4:

[0034] The number of printing rollers 6 in the printing device 4 is not limited. A single printing roller 6 or multiple printing rollers 6 can be set according to the complexity of the printing pattern and the diversity of colors. When one printing roller 6 is set, only one shift fork 14 and a set of adjustment mechanisms 7 can be set to control it. When multiple printing rollers 6 are set, multiple sets of adjustment mechanisms 7 need to be set accordingly. Figure 2As shown in FIG, three groups of printing rollers 6 are provided. It is understandable that if only one printing roller 6 is provided, it can usually only be dipped in ink of one color during printing. In order to print patterns of multiple colors, in this embodiment, multiple printing rollers 6 are provided on the same printing shaft 9, which is convenient for printing different patterns and different colors. In addition, multiple partitions 26 are provided in the ink hopper 24. The partitions 26 divide the ink hopper 24 into multiple compartments, and each compartment is provided with a corresponding printing roller 6. The printing rollers 6 in each group of printing devices 4 are all immersed in the ink hopper 24, and different inks can be added to different compartments, thereby printing patterns of various colors.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An online printing device for a bag making machine, comprising a reeling mechanism (1) and a reeling mechanism (2) and a packaging bag film (3) therebetween, characterized in that: At least one printing device (4) is provided between the unwinding mechanism (1) and the rewinding mechanism (2), the printing device (4) comprising an upper roller (5) and a printing roller (6) located below the upper roller (5), the upper surface of the printing roller (6) being provided with a relief plate for printing a pattern, the printing roller (6) being capable of moving along its axial direction, and further comprising an adjusting mechanism (7) for controlling the axial movement of the printing roller (6); The adjusting mechanism (7) further includes a driving mechanism for the shift fork (14), which includes an adjusting cylinder (17) and a fixed shaft (18). Both ends of the fixed shaft (18) are fixedly arranged on the outer frame (8) and parallel to the printing shaft (9). The adjusting cylinder (17) is rotatably connected to the fixed shaft (18), and a cylindrical cam groove (19) is provided on the cylindrical surface of the adjusting cylinder (17). A cam key (20) is provided on the shift fork (14) to cooperate with the cylindrical cam groove (19). When the adjusting cylinder (17) rotates, the shift fork (14) is pushed to move in a fine adjustment manner through the cooperation between the cylindrical cam groove (19) and the cam key (20).

2. The online printing device for a bag making machine according to claim 1, characterized in that: The printing device (4) is arranged in an outer frame (8), and a printing shaft (9) is rotatably connected in the outer frame (8). The printing device (4) includes a printing roller (6), and the printing roller (6) is sleeved on the printing shaft (9). The side of the printing shaft (9) is provided with a convex key (10) along the axial direction, and the printing roller (6) is provided with a key groove (11) corresponding to it. The printing roller (6) can be driven to rotate by the printing shaft and can slide along its axial direction; the printing device (4) is provided with an outer frame (8), and the outer frame (8) is provided with a driving motor (12) for driving the printing shaft (9) to rotate.

3. The online printing device for a bag making machine according to claim 2, characterized in that: A driving annular groove (13) is provided on one end surface of the printing roller (6), and the adjusting mechanism (7) includes a shift fork (14). The fork opening (15) of the shift fork (14) cooperates with the driving annular groove (13). The driving annular groove (13) is inserted through the fork opening (15) of the shift fork (14), so that the driving annular groove (13) and the fork opening (15) are rotatably connected. The shift fork (14) can move along the axial direction of the printing roller (6) and drive the printing roller (6) to move its position.

4. The online printing device for a bag making machine according to claim 3, characterized in that: The outer frame (8) is provided with at least two parallel guide shafts (16), the guide shafts (16) are parallel to the printing shaft (9), the end of the shift fork (14) away from the fork opening (15) is slidably connected to the two guide shafts (16), and the shift fork (14) is provided with linear bearings at the two sliding connections.

5. The online printing device for a bag making machine according to claim 1, characterized in that: A worm wheel (21) is fixedly provided on one end face of the adjusting cylinder (17), and a worm (22) is rotatably connected to the side wall of the outer frame (8). The worm wheel (21) is meshedly connected with the worm (22), and an adjusting hand wheel (23) is provided on one end of the worm (22) extending out of the outer frame (8).

6. An online printing device for a bag making machine according to any one of claims 1 to 5, characterized in that: The printing device (4) is provided with multiple groups in the outer frame (8); the printing rollers (6) in each group of the printing devices (4) are immersed in the ink hopper (24), and a hopper lifting cylinder (25) is provided below the ink hopper (24).

7. The online printing device for a bag making machine according to claim 6, characterized in that: A plurality of partitions (26) are provided in the ink hopper (24), and the partitions (26) divide the ink hopper (24) into a plurality of compartments, and a printing roller (6) is correspondingly provided in each compartment.

8. The online printing device for a bag making machine according to claim 7, characterized in that: A lifting cylinder 2 (27) for controlling the lifting of the upper roller (5) is installed above the upper roller (5).

9. The online printing device for a bag making machine according to claim 7, characterized in that: A scraper (28) is also provided in the outer frame (8), and the scraper (28) cooperates with the roller surface of the printing roller (6).

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