labelling machine

Abstract

The application discloses a labeling machine, comprising a unwinding assembly, a tension roller assembly and a labeling assembly, a label roll is arranged on the unwinding assembly, the tension roller assembly and the labeling assembly are sequentially arranged along the conveying direction of the label tape, a pneumatic tension area is arranged between the tension roller assembly and the labeling assembly along the conveying direction of the label tape, the label tape has parallel first and second side surfaces, the first side surface in the pneumatic tension area is subjected to a gas pressure P1, the second side surface in the pneumatic tension area is subjected to a gas pressure P2, ΔP=|P1-P2|, and ΔP>0. ΔP is continuously greater than 0, the first and second side surfaces of the label tape in the pneumatic tension area are always kept with a pressure difference, when the label tape is slack, the label tape can rapidly bend under the action of the pressure difference, the time consumption of tension adjustment is shortened, and therefore, the label tape can be continuously tensioned.

Description

Technical Field

[0001] This invention relates to the field of labeling equipment technology, and more particularly to a labeling machine. Background Technology

[0002] In many manufacturing industries, an essential part of product packaging is labeling products using labeling machines. Labeling machines include an unwinding assembly, a tension roller assembly, and a labeling assembly. The unwinding assembly controls the unwinding speed of the label roll, the tension roller assembly is used to tension the unwound label tape, ensuring that the label tape remains taut during transport and preventing it from slack and tangling, and the labeling assembly is used to peel the label body from the label tape and attach the label body to the corresponding product.

[0003] The existing technology has the following problems: the tension roller assembly generally consists of multiple tension rollers. When the label tape becomes loose, it is necessary to adjust the distance between the tension rollers to control the tension of the label tape. Understandably, the position adjustment and movement of the tension rollers cannot be completed instantly. Therefore, during the adjustment of the tension rollers, the label tape is still in a loose state. The label tape tension adjustment takes a long time and is not conducive to the labeling operation. Summary of the Invention

[0004] The purpose of this invention is to provide a labeling machine that has a short tension adjustment time and can continuously maintain the tension of the label tape.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A labeling machine is provided, comprising an unwinding assembly, a tensioning roller assembly, and a labeling assembly. A label roll is disposed on the unwinding assembly. The tensioning roller assembly and the labeling assembly are arranged sequentially along the conveying direction of the label tape. An air pressure tensioning zone is provided between the tensioning roller assembly and the labeling assembly along the conveying direction of the label tape. The label tape has a first side and a second side arranged opposite to each other along the thickness direction. The gas pressure on the first side located in the air pressure tensioning zone is P1, and the gas pressure on the second side located in the air pressure tensioning zone is P2, ΔP=|P1-P2|, ΔP>0.

[0007] As a preferred solution for labeling machines, P1 is negative pressure and P2 is atmospheric pressure.

[0008] As a preferred embodiment of the labeling machine, a pneumatic tensioning assembly is provided in the pneumatic tensioning zone. The pneumatic tensioning assembly includes an adsorption box, and a receiving cavity is provided inside the adsorption box. The receiving cavity is connected to a negative pressure pump, and the opening of the receiving cavity faces the first side. The label tape can be bent toward the receiving cavity.

[0009] As a preferred embodiment of the labeling machine, the adsorption box includes a box body and two plates. The two plates are spaced apart along the width direction of the label tape. The box body and the two plates enclose the receiving cavity and the opening of the receiving cavity. At least one plate is slidably connected to the box body and can move along the width direction of the label tape so that the edge of the label tape is attached to the plate.

[0010] As a preferred embodiment of the labeling machine, the adsorption box further includes an adjusting rod and a locking component. The locking component is disposed on the box body, and the box body is provided with an adjusting hole. The adjusting rod is slidably disposed in the adjusting hole and is connected to the plate. The locking component is connected to the adjusting rod and selectively locks the adjusting rod.

[0011] As a preferred embodiment of the labeling machine, the pneumatic tensioning assembly further includes two guide rollers, which are rotatably disposed at the edge of the opening of the receiving cavity. The guide rollers are dynamically sealed to the side wall of the adsorption box. The two guide rollers are spaced apart along the conveying direction of the label tape, and the first side abuts against the circumferential side of the guide roller.

[0012] As a preferred embodiment of the labeling machine, a portion of the plate protrudes from the receiving cavity along a direction perpendicular to the first side.

[0013] As a preferred design for a labeling machine, P1 is negative pressure and P2 is positive pressure; or...

[0014] P1 is atmospheric pressure, and P2 is positive pressure.

[0015] As a preferred embodiment of the labeling machine, an air pressure tensioning assembly is provided in the air pressure tensioning zone. The air pressure tensioning assembly includes an air blower, and the air outlet of the air blower faces the second side.

[0016] As a preferred embodiment of the labeling machine, the tension per unit width of the label tape located in the air pressure tension zone, generated by the pressure difference, is F', where F' ≤ 4N.

[0017] The beneficial effects of this invention are as follows: By setting up an air pressure tensioning zone, the pressure on both sides of the label tape is inconsistent, resulting in a pressure difference between the two sides of the label tape. When the label tape becomes slack, under the action of the pressure difference, the label tape will bend towards the side with lower pressure. The label tape in the air pressure tensioning zone is not kept taut in a straight line, but rather in a curved bending manner. The air pressure tensioning zone can cause the label tape to bend, thereby absorbing the label tape released by the unwinding assembly due to inertia, ensuring that the label tape outside the air pressure tensioning zone can also maintain tension. After the distance between each tensioning roller shaft in the tensioning roller assembly is adjusted, the label tape in the air pressure tensioning zone can overcome the pressure difference and restore straight tension under tension. Since ΔP is always greater than 0 in the air pressure tensioning zone, the first and second sides of the label tape always maintain a pressure difference in the air pressure tensioning zone. When the label tape becomes slack, the label tape can quickly bend under the action of the pressure difference, shortening the time required for tension adjustment, thereby ensuring that the label tape can maintain continuous tension. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the labeling machine described in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the adsorption box and label tape described in an embodiment of the present invention.

[0021] Figure 3 This is a three-dimensional schematic diagram of the adsorption box described in an embodiment of the present invention.

[0022] Figure 4 This is a schematic front view of the adsorption box according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the decomposition of the adsorption box according to an embodiment of the present invention.

[0024] In the picture:

[0025] 100. Label tape; 200. Label roll; 300. Product; 400. Spacer space;

[0026] 1. Base; 2. Unwinding assembly; 3. Tensioning roller assembly; 31. Tensioning roller shaft; 4. Pneumatic tensioning assembly; 41. Adsorption box; 411. Box body; 412. Plate body; 413. Adjusting rod; 414. Mounting plate; 415. Guide roller shaft; 416. Locking component; 417. Receiving cavity; 5. Labeling assembly; 51. Labeling disc; 52. Labeling component; 6. Automatic switching assembly; 7. Rewinding assembly. Detailed Implementation

[0027] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figures 1 to 5 As shown, the present invention provides a labeling machine, which includes a base 1, an unwinding assembly 2, a tension roller assembly 3, a labeling assembly 5, and a rewinding assembly 7. The unwinding assembly 2 is disposed on the base 1 and has a label roll 200 disposed on it. The unwinding assembly 2 controls the unwinding speed of the label roll 200. The tension roller assembly 3, the labeling assembly 5, and the rewinding assembly 7 are all disposed on the base 1 and arranged sequentially along the conveying direction of the label tape 100. The tension roller assembly 3 includes multiple tension roller shafts 31, which are spaced apart along the conveying direction of the label tape 100. The tension roller shafts 31 are used to tension the unwound label tape 100, so that the label tape 100 remains taut during conveying and avoids... When the label becomes loose and tangled, the labeling assembly 5 is used to peel the label body from the label tape 100 and attach the label body to the corresponding product 300. The winding assembly 7 is used to wind up the peeled label tape 100. Along the conveying direction of the label tape 100, a pneumatic tensioning zone is provided between the tensioning roller assembly 3 and the labeling assembly 5. The label tape 100 has a first side and a second side that are parallel to each other. The first side and the second side are arranged opposite each other along the thickness direction of the label tape 100. The gas pressure on the first side located in the pneumatic tensioning zone is P1, and the gas pressure on the second side located in the pneumatic tensioning zone is P2. ΔP=|P1-P2|, ΔP>0.

[0030] Reference Figure 1The labeling component 5 includes a labeling tray 51, with multiple labeling elements 52 arranged around the periphery of the labeling tray 51. After the labeling elements 52 peel the label body from the label tape 100, the labeling tray 51 rotates, rotating the labeling elements 52 with the label body to the labeling station. The labeling elements 52 at the labeling station are aligned with the product 300 on the production line, so that the labeling elements 52 can affix the removed label to the corresponding product 300. Under normal circumstances, the products 300 on the production line are evenly arranged. However, due to reasons such as defective product rejection, there will be gaps 400 on the production line. When the labeling element 52 at the labeling station encounters a gap 400, the labeling element 52 will not perform the labeling operation, and the labeling tray 51 remains stationary. After the production line transports the product 300 to the labeling station and the labeling element 52 completes the labeling operation, the labeling tray 51 will be driven so that the next labeling element 52 with the label body enters the labeling station. To avoid label waste, while the labeling tray 51 is stationary and waiting for product 300, the winding assembly 7 will also remain stationary and will not perform winding operations. The unwinding assembly 2 will stop unwinding after receiving a signal. However, in the initial adjustment phase, the unwinding assembly 2 will still release a portion of the label tape 100 due to inertia, causing the label tape 100 to become slack. When the labeling machine's sensor detects that the label tape 100 has become slack, the tension roller assembly 3 inside the labeling machine receives an adjustment signal and adjusts the distance between the tension roller shafts 31 accordingly to keep the label tape 100 taut. The adjustment speed of the distance between the tension roller shafts 31 is affected by the sensor's detection speed, the response speed of the tension roller assembly 3, and the mechanical adjustment speed of the tension roller shafts 31 themselves. The adjustment of the tension of the label tape 100 takes a long time.

[0031] By setting up an air pressure tension zone, the pressure on both sides of the label tape 100 is inconsistent, creating a pressure difference between the two sides of the label tape 100. When the label tape 100 becomes slack, under the action of the pressure difference, the label tape 100 will bend towards the side with lower pressure. The label tape 100 within the air pressure tension zone is not kept taut in a straight line, but rather in a curved bending manner. In other words, the air pressure tension zone allows the label tape 100 to bend, thereby absorbing the label tape 100 released by the unwinding assembly 2 due to inertia, ensuring the label tape outside the air pressure tension zone remains taut. The label tape 100 can also maintain tension. After the distance between each tension roller shaft 31 in the tension roller assembly 3 is adjusted, the label tape 100 in the air pressure tension zone can overcome the pressure difference and restore linear tension. Since ΔP is always greater than 0 in the air pressure tension zone, that is, the first side and the second side of the label tape 100 always maintain a pressure difference in the air pressure tension zone. Therefore, when the label tape 100 becomes loose, the label tape 100 can quickly bend under the action of the pressure difference, shortening the time required for tension adjustment, thereby ensuring that the label tape 100 can maintain tension.

[0032] In this embodiment, P1 is negative pressure and P2 is atmospheric pressure. By setting P1 to negative pressure and P2 to atmospheric pressure, the component that generates negative pressure can be provided only on one side of the label tape 100, while the other side of the label tape 100 is at atmospheric pressure. By providing the component that generates negative pressure only on one side of the label tape 100, the number of parts inside the labeling machine can be reduced, thereby simplifying the structure of the labeling machine and reducing costs.

[0033] In other embodiments, P1 can be set to negative pressure and P2 to positive pressure; or P1 can be set to atmospheric pressure and P2 to positive pressure. Of course, both P1 and P2 can be set to negative pressure or both to positive pressure, but the pressure difference between P1 and P2 must still be maintained.

[0034] In this embodiment, a pneumatic tensioning assembly 4 is provided within the pneumatic tensioning zone. The pneumatic tensioning assembly 4 includes an adsorption box 41, and a receiving cavity 417 is provided within the adsorption box 41. The receiving cavity 417 is connected to a negative pressure pump, and the opening of the receiving cavity 417 faces the first side. The label tape 100 can be bent towards the receiving cavity 417. By providing the adsorption box 41 connected to the negative pressure pump, the adsorption box 41 can change the flow path and flow range of the negative pressure airflow generated by the negative pressure pump, thereby ensuring that the negative pressure generated by the negative pressure pump can act on the label tape 100, ensuring the negative pressure tensioning effect on the label tape 100.

[0035] Furthermore, the adsorption box 41 includes a box body 411 and two plates 412. The two plates 412 are spaced apart along the width direction of the label tape 100. The box body 411 and the two plates 412 enclose a receiving cavity 417 and an opening of the receiving cavity 417. At least one plate 412 is slidably connected to the box body 411 and can move along the width direction of the label tape 100 so that the edge of the label tape 100 is in contact with the plate 412. By setting the plate 412 to slide and connect with the box body 411, and by allowing the plate 412 to move along the width of the label tape 100, the opening size of the receiving cavity 417 can accommodate label tapes 100 of different widths and heights, thus increasing the versatility of the adsorption box 41. By setting the edge of the label tape 100 to fit against the side of the plate 412, on the one hand, airflow can be reduced from flowing out of the gap between the edge of the label tape 100 and the side of the plate 412, thereby allowing the first and second sides of the label tape 100 to be subjected to different pressures. On the other hand, it can be ensured that when the label tape 100 becomes loose, it can face into the receiving cavity 417, preventing the label tape 100 from being blocked by the plate 412 and unable to bend, thus ensuring the tension effect of the label tape 100.

[0036] Reference Figure 4 and Figure 5The adsorption box 41 also includes an adjusting rod 413 and a locking member 416. The locking member 416 is disposed on the box body 411. The box body 411 is provided with an adjusting hole. The adjusting rod 413 is slidably disposed in the adjusting hole. The adjusting rod 413 is connected to the plate 412. The locking member 416 is connected to the adjusting rod 413 and selectively locks the adjusting rod 413. In this embodiment, two adjusting rods 413 are provided. One end of the adjusting rod 413 is fixed to the plate body 412 through the mounting plate 414, and the other end of the adjusting rod 413 passes through the adjusting hole. The locking member 416 includes a mounting base and a locking screw provided on the mounting base. The mounting base is fixed on the box body 411. The end face of the mounting base is provided with a through mounting hole that communicates with the adjusting hole. The side wall of the mounting base is provided with a threaded hole that communicates perpendicularly with the mounting hole. The locking screw is screwed into the threaded hole. The end of the adjusting plate away from the plate body 412 passes through the mounting hole. When the end face of the locking screw is tightened against the adjusting rod 413, the adjusting rod 413 is locked and cannot move up or down. When the end face of the locking screw is separated from the adjusting rod 413, the adjusting rod 413 can move up and down, thereby driving the plate body 412 to move up and down to achieve position adjustment.

[0037] Furthermore, the pneumatic tensioning assembly 4 also includes two guide rollers 415. These two guide rollers 415 are rotatably disposed at the edge of the opening of the receiving cavity 417. The guide rollers 415 are dynamically sealed to the side wall of the adsorption box 41. The two guide rollers 415 are spaced apart along the conveying direction of the label tape 100, with the first side abutting against the circumferential side of the guide rollers 415. Understandably, under the action of pressure difference, the first side of the label tape 100 is pressed against the side wall of the adsorption box 41. Therefore, during the movement of the label tape 100, dynamic friction will occur between it and the adsorption box 41, which could scratch the label tape 100. By providing the guide rollers 415, the guide rollers 415 will rotate as the label tape 100 moves, avoiding dynamic friction with the label tape 100 and preventing scratches.

[0038] Preferably, a portion of the plate 412 protrudes from the receiving cavity 417 in a direction perpendicular to the first side surface. By setting a portion of the plate 412 to protrude from the receiving cavity 417, even if the label tape 100 bends toward the side away from the receiving cavity 417 during the initial relaxation phase, the side surface of the plate 412 can still fit against the edge of the label tape 100, ensuring that the negative pressure generated by the negative pressure pump can act on the first side surface of the label tape 100.

[0039] The negative pressure pump has adjustable pressure to meet the needs of label tapes of different materials and thicknesses. (Refer to 100) Figure 4In this embodiment, the distance between the two plates 412 is W, the distance between the two guide rollers 415 is L, the tension of the label tape 100 within the air pressure tension zone due to the pressure difference is F, F = ΔP * L * W, and the tension per unit width of the label tape 100 within the air pressure tension zone due to the pressure difference is F', where F' ≤ 4N. By setting the tension per unit width of the label tape 100 within the air pressure tension zone due to the pressure difference to be no greater than 4N, it can be ensured that the production line does not slow down under high-speed (above 20000PBH) production conditions, and that optimal tensioning effect is still achieved even when there is a gap of 400.

[0040] In other embodiments, P1 can be set to negative pressure and P2 to positive pressure; or P1 can be set to atmospheric pressure and P2 to positive pressure. Of course, both P1 and P2 can be set to negative pressure or both to positive pressure, but the pressure difference between P1 and P2 must still be maintained.

[0041] In one embodiment, P2 is a positive pressure, and the air pressure tensioning assembly 4 includes an air blower with its outlet facing the second side. By setting the air blower, the air pressure on the second side of the label tape 100 can be greater than the air pressure on the first side. When the label tape 100 becomes slack, under the blowing of the air blower, the label tape 100 will bend towards the side away from the air blower, thereby maintaining tension.

[0042] In this embodiment, there are two unwinding components 2, each with a label roll 200. The labeling machine is also equipped with an automatic switching component 6, which is existing technology. When the label roll 200 on one of the unwinding components 2 is about to be unwound, the automatic switching component 6 can connect the label roll 200 on the other unwinding component 2 to ensure the continuous operation of the labeling machine.

[0043] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A labeling machine, comprising an unwinding assembly, a tension roller assembly, and a labeling assembly, wherein a label roll is disposed on the unwinding assembly, the tension roller assembly and the labeling assembly are arranged sequentially along the conveying direction of the label tape, the tension roller assembly includes a plurality of tension roller shafts, the plurality of tension roller shafts are spaced apart along the conveying direction of the label tape, and adjusting the distance between the tension roller shafts can keep the label tape taut, characterized in that, Along the conveying direction of the label tape, a pneumatic tensioning zone is provided between the tensioning roller assembly and the labeling assembly. The label tape has a first side and a second side arranged opposite to each other along the thickness direction. The gas pressure on the first side located in the pneumatic tensioning zone is P1, and the gas pressure on the second side located in the pneumatic tensioning zone is P2. ΔP=|P1-P2|, ΔP>0. When the label tape becomes slack, under the action of ΔP, the label tape can bend towards the side with lower pressure. The label tape in the air pressure tensioning zone maintains tension in a curved bending manner, thereby shortening the time required for tension adjustment. After the distance between each tensioning roller shaft in the tensioning roller assembly is adjusted, the label tape in the air pressure tensioning zone is stretched to overcome ΔP and restores straight tension.

2. The labeling machine according to claim 1, characterized in that, P1 is negative pressure, and P2 is atmospheric pressure.

3. The labeling machine according to claim 2, characterized in that, A pneumatic tensioning assembly is provided in the pneumatic tensioning zone. The pneumatic tensioning assembly includes an adsorption box, and a receiving cavity is provided in the adsorption box. The receiving cavity is connected to a negative pressure pump. The opening of the receiving cavity faces the first side, and the label tape can be bent toward the receiving cavity.

4. The labeling machine according to claim 3, characterized in that, The adsorption box includes a box body and two plates. The two plates are spaced apart along the width direction of the label tape. The box body and the two plates enclose the receiving cavity and the opening of the receiving cavity. At least one plate is slidably connected to the box body and can move along the width direction of the label tape so that the edge of the label tape is in contact with the plate.

5. The labeling machine according to claim 4, characterized in that, The adsorption box also includes an adjusting rod and a locking component. The locking component is disposed on the box body, and the box body is provided with an adjusting hole. The adjusting rod is slidably disposed in the adjusting hole and is connected to the plate. The locking component is connected to the adjusting rod and selectively locks the adjusting rod.

6. The labeling machine according to claim 4, characterized in that, The pneumatic tensioning assembly also includes two guide rollers, which are rotatably disposed at the edge of the opening of the receiving cavity. The guide rollers are dynamically sealed to the side wall of the adsorption box. The two guide rollers are spaced apart along the conveying direction of the label tape, and the first side abuts against the circumferential side of the guide roller.

7. The labeling machine according to claim 4, characterized in that, A portion of the plate protrudes from the receiving cavity along a direction perpendicular to the first side.

8. The labeling machine according to claim 1, characterized in that, P1 is a negative pressure, P2 is a positive pressure; or, P1 is atmospheric pressure, and P2 is positive pressure.

9. The labeling machine according to claim 8, characterized in that, An air pressure tensioning assembly is provided in the air pressure tensioning zone. The air pressure tensioning assembly includes an air blower, and the air outlet of the air blower faces the second side.

10. The labeling machine according to any one of claims 1-9, characterized in that, The tension per unit width of the label tape located within the air pressure tension zone, generated by the pressure difference, is F', where F' ≤ 4N.

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