Automatic control mechanism for winding and unwinding label winding cylinder

Abstract

An automatic winding and unwinding control mechanism for a label winding cylinder comprises a supporting arm and a tensioning plate, the ends of the supporting arm and the tensioning plate are hinged to each other, a supporting shaft is vertically arranged in the middle of the surface of the supporting arm, the lower portion of the supporting shaft is coaxially and rotationally connected with a label winding base, a label winding tray is coaxially installed on the label winding base, an annular groove is formed in the outer side face of the label winding base, and a guide roller is arranged at the outer end of the tensioning plate. An elastic belt is sleeved with the annular groove, one end of the elastic belt is fixed to the middle of the tensioning plate, the other end of the elastic belt is fixed to the outer end of the supporting arm, and a tension spring is connected between the inner end of the tensioning plate and the middle of the side face of the supporting arm; the tension spring pulls the end of the tensioning plate to form an unwinding and tensioning mechanism, when label guiding and stripping are blocked and operation is not smooth, the tensioning force becomes weak, the spring pulls the tensioning plate back, the tensioning plate pulls the rubber tube to tighten the annular groove in the label roll base, the label roll base is braked in time, the phenomenon that labels are bent and stacked due to the fact that a label winding drum continues to unwind due to inertia is avoided, and the label winding drum is prevented from being damaged. Labels can be protected, and the arrangement and maintenance frequency of the system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of labeling machines, and in particular to an automatic control mechanism for unwinding and rewinding label rolls. Background Technology

[0002] The label feeding system of a packaging can labeling machine is a crucial component, ensuring accurate and efficient label application to the cans. This system typically includes key components such as label supply, label guidance, label peeling, and label application. The label supply system provides labels and ensures they enter the machine at the correct speed and sequence. The label guidance system ensures labels maintain the correct orientation and flatness during transport for subsequent peeling and application. The label peeling system peels the labels from the backing paper while maintaining their flatness and integrity. The label application system smoothly and quickly applies the peeled labels to the can surface. The label supply system usually consists of a label roll mounted on an unwinding bracket. As the labels are guided and peeled, the roll rotates and unwinds. A current problem with this system is that when the peeling process encounters obstacles, the roll continues to unwind due to inertia, resulting in a large number of bent and stacked labels within the system. This necessitates rewinding and reorganization, which is time-consuming, labor-intensive, and carries the risk of label damage. This system needs improvement. Utility Model Content

[0003] To solve the above problems, this utility model proposes an automatic control mechanism for the unwinding and rewinding of label rolls.

[0004] The technical solution of this utility model is: an automatic control mechanism for unwinding and rewinding of label rolls, including a support arm and a tensioning plate hinged at their ends. A support shaft is vertically provided in the middle of the surface of the support arm. A label roll holder is coaxially rotatably connected to the lower part of the support shaft. A label roll tray is coaxially mounted on the label roll holder. Bearings are provided at both the upper and lower ends of the label roll holder, and are rotatably connected to the support shaft through the bearings. An annular groove is provided on the outer side of the label roll holder. The cross-section of the arc-shaped groove is arc-shaped. A guide roller is provided at the outer end of the tensioning plate. An elastic band is sleeved inside the annular groove. One end of the elastic band is fixed to the middle of the tensioning plate, and the other end is fixed to the outer end of the support arm. A tension spring is connected between the inner end of the tensioning plate and the middle of the side of the support arm. Hanging screws are provided on both the tensioning plate and the support arm. The two ends of the tension spring are respectively hung on two screws.

[0005] Preferably, the surface of the support arm is provided with a locking seat A, and the elastic band is inserted into the locking hole A of the locking seat A. The surface of the tensioning plate is provided with a locking seat B. Both locking seat A and locking seat B are cylindrical seats, and the elastic band is inserted into the locking hole B of the locking seat B.

[0006] Preferably, the locking seat is located inside the tensioning plate and can support the end of the tensioning plate inside the hinge point. The bottom surface of the locking seat has a threaded hole in the middle and a corresponding through hole on the support arm. A set screw is installed between the through hole and the threaded hole.

[0007] Preferably, both locking seat A and locking seat B have radially threaded holes on their sides, which are perpendicularly connected to the locking hole, and set screws are installed in the threaded holes.

[0008] Preferably, the elastic band is a rubber tube.

[0009] Preferably, a label roll pressure roller is coaxially rotatably connected to the upper part of the support shaft, and the size of the label roll pressure roller matches the size of the label roll base.

[0010] Preferably, two limiting rings are arranged side by side in the middle of the guide roller. The limiting rings are coaxially arranged with the guide roller and have notches to form an elastic fastening structure, so that the height can be adjusted on the guide roller.

[0011] The beneficial technical effects of this utility model are:

[0012] This invention utilizes a tension spring to pull the end of a tension plate to form an unwinding and tensioning mechanism. An annular groove is provided on the label roll holder, and a rubber tube connected to the support arm and the tension plate at both ends is fitted inside the annular groove. When the label guide encounters resistance and the operation becomes sluggish, the required tension force weakens, and the spring pulls back the tension plate. The tension plate then pulls the rubber tube to tighten the annular groove on the label roll holder, stopping the label roll holder in time. This prevents the label roll from continuing to unwind due to inertia, which could cause the labels to bend and stack. This protects the labels and reduces the frequency of system maintenance. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 This is a top view of the structure of this utility model after the label is installed;

[0015] Figure 3 This is a three-dimensional structural diagram of the present invention after the label tray has been removed;

[0016] Figure 4 This is a side view of the structure of this utility model after the label tray has been removed;

[0017] Figure 5 yes Figure 4 A schematic diagram of the AA-direction cross-section structure.

[0018] In the diagram, 11. support arm, 12. support shaft, 13. label roll holder, 14. annular groove, 15. tension plate, 16. guide roller, 17. tension spring, 18. locking seat A, 19. locking hole A, 20. locking seat B, 21. locking hole B, 22. top screw, 23. label roll pressure roller, 24. limit ring, 25. rubber tube, 26. label roll tray, 27. label roll. Detailed Implementation

[0019] Example 1, see appendix Figure 1-4 An automatic control mechanism for unwinding and rewinding label rolls includes a support arm 11 and a tensioning plate 15 hinged at their ends. A support shaft 12 is vertically disposed at the center of the support arm surface. A label roll holder 13 is coaxially rotatably connected to the lower part of the support shaft. A label roll tray 26 is coaxially mounted on the label roll holder 13 and rotates on the support shaft via the label roll holder. An annular groove 14 is provided on the outer surface of the label roll holder 13. A guide roller 16 is provided at the outer end of the tensioning plate 15. A roller shaft is sleeved inside the guide roller 16, and the lower end of the roller shaft is vertically and fixedly connected to the tensioning plate 15. The roller is mounted on the vertical shaft, and the lower end of the vertical shaft is fixedly connected to the tensioning plate. An elastic band is fitted inside the annular groove 14. One end of the elastic band is fixed to the middle of the tensioning plate 15, and the other end is fixed to the outer end of the support arm 11. When the tensioning plate 15 swings outward, it will pull the elastic band, and the elastic band will tighten the annular groove 14, thus stopping the label holder 13 in time. A tension spring 17 is connected between the inner end of the tensioning plate 15 and the middle of the side of the support arm 11. The tensioning plate 15 is pulled at the end by the spring, and the guide roller 16 on the tensioning plate 15 generates elastic tension force.

[0020] The elastic band is a rubber tube 25. The rubber tube itself has a good anti-slip effect, and it will elastically deform under pressure, squeezing into the annular groove 14 of the label holder 13. It has high braking sensitivity and good braking effect on the label holder 13.

[0021] Two limiting rings 24 are arranged side by side in the middle of the guide roller 16. The limiting rings are coaxially arranged with the guide roller 16. The width of the label is the same as the distance between the two limiting rings 24. The limiting rings 24 restrict the label and prevent it from sliding along the outer side of the guide roller 16 shaft, which would cause misalignment.

[0022] The principle of the automatic control mechanism in this embodiment is as follows: the tension spring 17 pulls the end of the tension plate 15, so that the guide roller 16 at the other end of the tension plate 15 generates tension force on the label wrapped around its outside. The label is unwound in a tensioned state. When the label guide peeling encounters resistance and the operation is not smooth, the label will become loose and the required tension force will weaken. The spring will pull back the tension plate 15, and the tension plate 15 will pull the rubber tube 25. The rubber tube 25 is stretched and undergoes elastic deformation and tightens the annular groove 14 on the label roll holder 13, stopping the label roll holder 13 in time. The label roll 27 on the label roll tray 26 stops unwinding, which can effectively avoid the phenomenon of the label roll bending and stacking due to the inertia of the label roll continuing to unwind.

[0023] Example 2, see appendix Figure 3-5 This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The difference is that: the surface of the support arm 11 is provided with a locking seat A 18, and the elastic band is fitted into the locking hole A 19 of the locking seat A 18; the surface of the tensioning plate 15 is provided with a locking seat B 20, and the elastic band is fitted into the locking hole B 21 of the locking seat B 20; both locking seats A and B have radially threaded holes on their sides, and set screws 22 are installed in the threaded holes. The ends of the elastic band are pressed against the two locking seats by the set screws 22, locking and fixing both ends of the elastic band to the two locking seats. At the same time, after releasing the set screws 22, the elastic band can be pulled outward from the locking holes to adjust the tension of the elastic band, thereby changing the braking sensitivity of the elastic band in the annular groove 14 as needed.

[0024] The locking seat 18 is located inside the tensioning plate 15 and can support the end of the tensioning plate 15 inside the hinge point. While locking the elastic band, the locking seat 18 can also limit the end of the tensioning plate, restrict the rotation and swing range of the tensioning plate 15, and prevent it from contacting the tape holder 13 and causing mutual interference.

Claims

1. An automatic control mechanism for the unwinding and rewinding of label rolls, characterized in that: The device includes a support arm and a tensioning plate with their ends hinged together. A support shaft is vertically provided in the middle of the surface of the support arm. A label holder is coaxially rotatably connected to the lower part of the support shaft. A label tray is coaxially mounted on the label holder. An annular groove is provided on the outer side of the label holder. A guide roller is provided at the outer end of the tensioning plate. An elastic band is sleeved inside the annular groove. One end of the elastic band is fixed to the middle of the tensioning plate, and the other end is fixed to the outer end of the support arm. A tension spring is connected between the inner end of the tensioning plate and the middle of the side of the support arm.

2. The automatic control mechanism for unwinding and rewinding of a label roll according to claim 1, characterized in that: The surface of the support arm is provided with a locking seat A, and the elastic band is inserted into the locking hole A of the locking seat A. The surface of the tensioning plate is provided with a locking seat B, and the elastic band is inserted into the locking hole B of the locking seat B.

3. The automatic control mechanism for unwinding and rewinding of label rolls according to claim 2, characterized in that: The locking seat is located inside the tensioning plate and can support the end of the tensioning plate inside the hinge point.

4. The automatic control mechanism for unwinding and rewinding of a label roll according to claim 2, characterized in that: Both locking seat A and locking seat B have radially threaded holes on their sides, and set screws are installed in the threaded holes.

5. The automatic control mechanism for unwinding and rewinding of a label roll according to claim 1, characterized in that: The elastic band mentioned is a rubber tube.

6. The automatic control mechanism for unwinding and rewinding of label rolls according to claim 1, characterized in that: The upper part of the support shaft is coaxially rotatably connected to a standard roll pressure roller.

7. The automatic control mechanism for unwinding and rewinding of a label roll according to claim 1, characterized in that: Two limiting rings are arranged side by side in the middle of the guide roller, and the limiting rings are coaxially arranged with the guide roller.

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