Label stack supply device

Abstract

The utility model discloses a label pile feeding device which is arranged in the forward direction of a labeling device and comprises a rack, a label supporting structure which is vertically and movably arranged is installed on the rack, and a height controller is arranged between the label supporting structure and the rack. The rack is provided with a label positioning mechanism used for limiting the position of a large label. The label supporting structure comprises a near-sticking end close to the labeling device and a far-sticking end far away from the labeling device, a first pressing structure is mounted at the far-sticking end on the rack, and a first pressing controller is arranged between the first pressing structure and the rack; a second pressing and holding structure is installed at the position, located at the attaching end, of the rack, and a second pressing and holding controller used for driving the second pressing and holding structure to leave the position over the large label is arranged between the second pressing and holding structure and the rack. According to the utility model, large labels can be stored in piles, the large labels can be directly supplied one by one conveniently, and full-automatic labeling of the large labels can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of labeling equipment, in particular to a label stack supply device. Background Art

[0002] At present, in the production of plastic bags, operations such as unwinding, intermittent cutting, heat sealing, and winding are basically automated. After winding, the plastic bags are wound into bag rolls, and the bag rolls are formed into packages by means of labeling. Among them, bag roll labeling is divided into two types: small label labeling and large label labeling. Small label labeling is a labeling method in which one or two stickers are pasted at the tail of the bag roll, which only achieves the effect of preventing the bag roll from loosening; large label labeling is a labeling method in which a rectangular label paper surrounds the outer peripheral surface of the bag roll by winding around the bag roll at least once. Because more comprehensive product and manufacturer information can be reflected on the large label, and it can protect the bag roll, it is more and more favored by plastic bag manufacturers.

[0003] Based on the relatively soft characteristics of the bag roll, at present, most of the large label pasting of plastic bag rolls is completed manually. The cost of manual labor is high, the efficiency is low, and the labeling quality is unstable, which limits the popularization and use of large label labeling. Therefore, more and more manufacturers have begun to research and manufacture fully automatic large label labeling machines. At present, the large label labeling machines that are compatible with the automatic production of plastic bags on the market are mainly, as Figure 8 shown, using continuous large labels output from a lateral label roll. Before the bag roll arrives, the position where the label needs to be pasted is first coated with glue or double-sided tape. The large label with glue is placed at the bag roll conveying position and cut off. After the bag roll arrives, it forms a label by rolling itself.

[0004] For such a large label labeling machine, before the wound bag roll enters the labeling machine, it is necessary to manually pre-seal the tail part of the bag roll to prevent the bag roll from loosening. Therefore, the labeling operation cannot be completely separated from manual labor, and the labor cost is still relatively high. And the bag roll labeling is divided into two steps: sealing and large label pasting. Not only is the process relatively complex, but the sealing step also generates additional equipment and material costs.

[0005] Based on the above situation, the inventor proposed an automatic labeling machine that can directly paste large labels on the wound bag rolls. Among them, it is required that the large label is input from the front in the rolling direction of the bag roll. This input method is difficult to achieve with the existing label roll unwinding and output method. There is a need for a supply means that can store the labels in stacks and facilitate single-sided front input to cooperate to complete the fully automatic labeling action. The present invention is thus created. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a label stack supply device that can realize the storage of large labels in stacks, facilitate the direct single-sided supply of large labels, and is conducive to the realization of fully automatic large label labeling.

[0007] To solve the above technical problems, the technical solution of the present utility model is: a label stack feeding device, arranged in the forward direction of the labeling device, including a frame, on which a label supporting structure is vertically movably arranged, and a height controller is provided between the label supporting structure and the frame; a label positioning mechanism for restricting the position of large labels is provided on the frame; the label supporting structure includes a near-label end close to the labeling device and a far-label end far from the labeling device, and a first pressing structure is installed at the far-label end on the frame, and a first pressing controller is provided between the first pressing structure and the frame; a second pressing structure is installed at the near-label end on the frame, and a second pressing controller for driving the second pressing structure to move away from directly above the large label is provided between the second pressing structure and the frame.

[0008] As a preferred technical solution, the second pressing controller includes a rotary cylinder arranged at the side of the near-label end, and the second pressing structure is fixedly arranged on the driving end of the rotary cylinder.

[0009] As a preferred technical solution, the label positioning mechanism includes a first positioning seat installed on the frame and located at the far-label end, on which a first positioning structure extending upward from the supporting surface of the label supporting structure is vertically movably installed, and a first telescopic controller is provided between the first positioning structure and the first positioning seat; a far-label positioning adjustment structure is provided between the first positioning seat and the frame, and a first avoidance long opening corresponding to the first positioning structure is provided on the label supporting structure.

[0010] As a preferred technical solution, a first flipping seat is abutted on the first positioning seat, the first positioning structure is installed on the first flipping seat, and one end of the first flipping seat far from the label supporting structure is hinged to the first positioning seat.

[0011] As a preferred technical solution, the first pressing controller and the first pressing structure are installed on the first positioning seat.

[0012] As a preferred technical solution, the label positioning mechanism includes a second positioning seat installed on the frame and located at the near-label end, on which a second positioning structure extending upward from the supporting surface of the label supporting structure is vertically movably installed, and a second telescopic controller is provided between the second positioning structure and the second positioning seat.

[0013] As a preferred technical solution, the label positioning mechanism includes two side positioning seats mounted on the frame and located on both sides of the label supporting structure respectively. The two side positioning seats are slidably arranged in a direction close to or away from the label supporting structure, and a side positioning adjustment structure is provided between the two side positioning seats and the frame; a side positioning structure extending upward beyond the supporting surface of the label supporting structure is fixedly provided on each side positioning seat, and side avoidance grooves corresponding to the side positioning structures are provided on the label supporting structure.

[0014] As a preferred technical solution, the second pressing structure and the second pressing controller are mounted on the side positioning seat.

[0015] As a preferred technical solution, the first pressing controller includes two first pressing cylinders respectively arranged on both sides of the far attachment end, and the first pressing structure is fixedly mounted on the driving ends of the two first pressing cylinders together.

[0016] As a preferred technical solution, the height controller includes a height transmission screw rod rotatably mounted on the frame, a height transmission screw hole cooperating with the height transmission screw rod is provided on the label supporting structure, and the height transmission screw rod is connected with a height control motor.

[0017] Due to the adoption of the above technical solution, the label stack feeding device is arranged in the forward direction of the labeling device and includes a frame. A vertically movable label supporting structure is mounted on the frame, and a height controller is provided between the label supporting structure and the frame; a label positioning mechanism for restricting the position of the large label is provided on the frame; the label supporting structure includes a near attachment end close to the labeling device and a far attachment end far from the labeling device. A first pressing structure is mounted on the frame at the far attachment end, and a first pressing controller is provided between the first pressing structure and the frame; a second pressing structure is mounted on the frame at the near attachment end, and a second pressing controller for driving the second pressing structure to move away from directly above the large label is provided between the second pressing structure and the frame. In the present utility model, the label supporting structure is used for placing the label stack, and the label positioning mechanism positions its position to realize stacked storage. The height controller controls the label supporting structure so that the uppermost large label in the label stack is always at a fixed height. The first pressing structure and the second pressing structure press both ends of the large label respectively, which jointly facilitates the gluing operation at both ends of the large label. During input, the first pressing controller drives the first pressing structure to release the pressing, and the second pressing controller drives the second pressing structure to move away from directly above the large label to avoid the label supply path. The uppermost large label that has been glued is convenient to be directly fed into the labeling device in the forward direction for labeling use, which is beneficial to realizing full-automatic labeling of large labels. Description of the Drawings

[0018] The following attached drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model. Among them:

[0019] Figure 1 is a schematic three-dimensional structure diagram of an embodiment of the present utility model;

[0020] Figure 2 is Figure 1 a schematic three-dimensional structure diagram from another perspective;

[0021] Figure 3 is Figure 1 a schematic three-dimensional structure diagram from yet another perspective;

[0022] Figure 4 is Figure 1 a schematic three-dimensional structure diagram from yet another perspective;

[0023] Figure 5 is a schematic three-dimensional structure diagram of the label supporting structure of an embodiment of the present utility model;

[0024] Figure 6 is a schematic three-dimensional structure diagram of one of the positioning seats on one side of an embodiment of the present utility model;

[0025] Figure 7 is a structural diagram of an embodiment of the present utility model used in conjunction with a labeling device;

[0026] Figure 8 is a schematic diagram of the principle of an existing large-label labeling machine.

[0027] In the figure: 1 - frame; 2 - label supporting structure; 21 - near-labeling end; 22 - far-labeling end; 3 - height controller; 31 - height transmission screw; 32 - height control motor; 4 - label positioning mechanism; 41 - side positioning seat; 411 - side positioning structure; 412 - side avoidance groove; 42 - side positioning adjustment structure; 421 - side adjustment screw sleeve; 422 - side adjustment screw; 43 - first positioning seat; 431 - first positioning structure; 432 - first avoidance long opening; 433 - first telescopic controller; 434 - first flipping seat; 44 - far-labeling positioning adjustment structure; 45 - second positioning seat; 451 - second positioning structure; 452 - second telescopic controller; 46 - near-labeling positioning adjustment structure; 5 - first pressing structure; 51 - first pressing controller; 6 - second pressing structure; 61 - second pressing controller; 91 - labeling device; 92 - bag roll; 93 - label stack; 94 - large label. Detailed implementation manners

[0028] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the drawings and the description are illustrative in nature and are not used to limit the scope of protection of the claims.

[0029] As Figures 1 to 7 As commonly shown, the label stack feeding device is arranged in the forward direction of the labeling device 91. Among them, the labeling device 91 forms a label by rolling the bag roll 92, and its forward direction is approximately the radial direction of the bag roll 92; the label stack 93 is a label set formed by stacking a number of single large labels 94 one above the other in sequence. The above is easily understood by those skilled in the art and will not be elaborated here.

[0030] The device includes a frame 1, which can be shared by the labeling device 91 or can be separately provided and relatively fixed to the frame 1 of the labeling device 91, without limitation here. A vertically movable label supporting structure 2 is installed on the frame 1, and the label supporting structure 2 is used to support the label stack 93; conventionally, the label supporting structure 2 includes a label supporting table and a frame structure for supporting and connecting below the label supporting table, and the upper surface of the label supporting table constitutes the bearing surface of the label supporting structure 2. The label supporting structure 2 is vertically movably arranged through a structure such as a guide rod and a sliding sleeve or a guide rail and a sliding seat. Only the guide rod and sliding sleeve structure is used for illustration in this embodiment.

[0031] A height controller 3 is provided between the label supporting structure 2 and the frame 1. The height controller 3 in this embodiment has two functions. First, after the top large label 94 of the label stack 93 is output, the height controller 3 finely adjusts the height of the label supporting structure 2 so that the top large label 94 of the label stack 93 can always be at a fixed height, which is convenient for gluing and also convenient for smoothly outputting to the labeling device 91; second, after all the large labels 94 in the label stack 93 are used up, the height controller 3 drives the label supporting structure 2 to lower to a lower height, which is convenient for adding a new label stack 93.

[0032] In this embodiment, the height controller 3 includes a height transmission screw 31 rotatably mounted on the frame 1. A height transmission screw hole matching with the height transmission screw 31 is provided on the label supporting structure 2. The height transmission screw 31 is connected with a height control motor 32. Of course, the height control motor 32 is preferably a servo motor with high control precision, etc., and precise height control is achieved through the cooperation of the servo motor and screw transmission. In actual use, a sensor for detecting the height of the uppermost large label 94 should be provided on the frame 1 to serve as a signal for the operation of the height controller 3. This signal detection and controller operation are easily obtained by those skilled in the art by combining conventional technical means and will not be elaborated here.

[0033] A label positioning mechanism 4 for restricting the position of the large label 94 is provided on the frame 1, so that the label stack 93 on the label supporting structure 2 can be in the required position in the horizontal direction, which is convenient for precise gluing and also convenient for accurately supplying to the labeling device 91. The label supporting structure 2 includes a near-labeling end 21 close to the labeling device 91 and a far-labeling end 22 far from the labeling device 91. In this embodiment, such a definition enables the positions of each structure to be described more clearly.

[0034] The label positioning mechanism 4 includes two side positioning seats 41 mounted on the frame 1 and located on both sides of the label supporting structure 2 respectively. The two side positioning seats 41 are slidably arranged in the direction of approaching or departing from the label supporting structure 2. A side positioning adjustment structure 42 is provided between the two side positioning seats 41 and the frame 1. Side positioning structures 411 extending upward from the supporting surface of the label supporting structure 2 are respectively fixed on each side positioning seat 41. Side avoidance grooves 412 corresponding to the side positioning structures 411 are provided on the label supporting structure 2.

[0035] Both sides of the label stack 93 are laterally restricted by the side positioning structures 411, and the two side positioning seats 41 are made to approach or depart from the label supporting structure 2 through the side positioning adjustment structure 42. In this embodiment, lateral positioning of labels with different widths can be realized.

[0036] The side positioning and adjusting structure 42 includes side adjusting nuts 421 respectively installed on the two side positioning seats 41. The spiral directions of the two side adjusting nuts 421 are set to be opposite. Side adjusting screws 422 are respectively installed on each side adjusting nut 421, and the proximal ends of the two side adjusting screws 422 are fixedly connected. Thus, by rotating the side adjusting screw 422 forward or backward, the two side positioning seats 41 can be moved closer to or away from each other. Of course, axial movement restriction of the side adjusting screw 422 on the frame 1 should be achieved. This can be realized by setting a rotating seat on the frame 1 and a step on the screw, etc. The setting position can be between the two side adjusting screws 422 or at the distal end of the side adjusting screw 422. This embodiment does not limit this here. This axial movement restriction can be easily obtained by those skilled in the art by combining conventional technical means such as axial rotation installation, and will not be elaborated here.

[0037] The label positioning mechanism 4 in this embodiment further includes a first positioning seat 43 installed on the frame 1 and located at the far pasting end 22. A first positioning structure 431 is vertically movably installed on the first positioning seat 43 and extends upward from the supporting surface of the label supporting structure 2. A first telescopic controller 433 is provided between the first positioning structure 431 and the first positioning seat 43; a far pasting positioning and adjusting structure 44 is provided between the first positioning seat 43 and the frame 1, and a first avoidance long hole 432 corresponding to the first positioning structure 431 is provided on the label supporting structure 2.

[0038] The first positioning structure 431 restricts one end of the label stack 93 away from the labeling device 91, and the position of the first positioning seat 43 is adjustable through the far pasting positioning and adjusting structure 44. In this embodiment, end positioning of different-length labels can be realized for use. The far pasting positioning and adjusting structure 44 can be realized by a structure of a long hole and a bolt, or a structure of a sliding seat and a sliding rail and a radial bolt, etc. This is not limited here. In this embodiment, a structure of a sliding seat and a sliding rail and a radial bolt is used for illustration.

[0039] The setting of the first telescopic controller 433 can control the first positioning structure 431 to descend and leave the position of the uppermost large label 94 when gluing the uppermost large label 94 in the label stack 93, so as to provide an avoidance space for the gluing device. The first telescopic controller 433 can be realized by means such as a driving cylinder or a motor drive, etc. This is not limited here. In this embodiment, only a driving cylinder is used for illustration.

[0040] Preferably, a first flipping seat 434 is placed on the upper seat of the first positioning seat 43, and the first positioning structure 431 is installed on the first flipping seat 434. Of course, the first telescopic controller 433 is arranged between the first positioning structure 431 and the first flipping seat 434; one end of the first flipping seat 434 away from the label supporting structure 2 is hingedly connected to the first positioning seat 32. Thus, the first positioning structure 431, the first telescopic controller 433, and the first flipping seat 434 can be integrally flipped away from the label supporting structure 2. Through this flipping, it can cooperate with the height controller 3 to drive the label supporting structure 2 to descend, making it more convenient to place a new stack of labels 93 on the label supporting structure 2. Based on the setting of the first flipping seat 434, the first avoiding long slot 432 should have sufficient length in the direction away from the label supporting structure 2. Preferably, it is an open slot structure at the far attaching end 22.

[0041] Relative to the positioning at the far attaching end 22, the label positioning mechanism 4 further includes a second positioning seat 45 installed on the machine frame 1 and located at the near attaching end 21. A second positioning structure 451 that extends upward from the supporting surface of the label supporting structure 2 is vertically movably installed on the second positioning seat 45. A second telescopic controller 452 is provided between the second positioning structure 451 and the second positioning seat 45. The second positioning structure 451 restricts one end of the stack of labels 93 close to the labeling device 91. It is also controlled by the telescopic movement of the second telescopic controller 452 and can be lowered to a position away from the uppermost large label 94 during gluing to provide an avoidance space for the gluing device.

[0042] Based on the relatively fixed distance between the stack of labels 93 and the labeling device 91, the position of one end of the stack of labels 93 close to the labeling device 91 on the label supporting structure 2 is relatively fixed. Therefore, no positioning adjustment may be provided between the second positioning seat 45 and the machine frame 1. Of course, it is also possible to set a near attaching end positioning adjustment structure 46, which at least facilitates the position adjustment cooperation during equipment assembly.

[0043] A first pressing structure 5 is installed on the machine frame 1 at the far attaching end 22. Through this pressing, the stability of the uppermost large label 94 at the far attaching end 22 during the gluing process can be ensured, which is beneficial to ensuring the gluing quality. A first pressing controller 51 is provided between the first pressing structure 5 and the machine frame 1, and the first pressing controller 51 controls the first pressing structure 5 to press or release the pressing on the large label 94.

[0044] The first pressing controller 51 in this embodiment includes two first pressing cylinders respectively arranged on both sides of the far attachment end 22. The first pressing structure 5 is fixedly installed on the driving ends of the two first pressing cylinders, and the pressing or releasing of the pressing is realized by the extension and retraction of the pressing cylinders. The first pressing structure 5 can be implemented by structures such as plates and rods that can achieve multi-point pressing or continuous pressing in the width direction, and no limitation is made here.

[0045] A second pressing structure 6 is installed on the frame 1 at the near attachment end 21. By this pressing, the stability of the uppermost large label 94 at the near attachment end 21 during the gluing process can be ensured, which is beneficial to ensuring the gluing quality. A second pressing controller 61 for driving the second pressing structure 6 to leave directly above the large label 94 is provided between the second pressing structure 6 and the frame 1. The second pressing controller 61 controls the second pressing structure 6 to press or release the pressing on the large label 94, and when the pressing is released, the second pressing structure 6 can leave directly above the large label 94 to avoid the output path of the large label 94 to the labeling device 91.

[0046] The second pressing controller 61 in this embodiment includes a corner cylinder arranged on the side of the near attachment end 21. The second pressing structure 6 is fixedly arranged on the driving end of the corner cylinder. Through the corner movement inherent in the extension and retraction process of the corner cylinder, the second pressing structure 6 can leave directly above the large label 94 when the pressing is released. The second pressing structure 6 can also be implemented by structures such as plates and rods that can achieve multi-point pressing or continuous pressing in the width direction, and no limitation is made here.

[0047] Preferably, the first pressing controller 51 and the first pressing structure 5 are installed on the first positioning seat 43. For the forward input of the large label 94 to the labeling device 91, one end of it close to the labeling device 91 adheres to the outer periphery of the bag roll 92 first, and this end and the bag roll 92 roll together, and the remaining part gradually winds around the outer periphery of the bag roll 92 during the rolling of the bag roll 92 until the end of the large label 94 that was originally far from the labeling device 91 also winds around the outer periphery of the bag roll 92; at this time, the glue at the end of the large label 94 that was originally far from the labeling device 91 can adhere to the bag roll 92 or its own label paper to form a label. In this embodiment, the first pressing controller 51 and the first pressing structure 5 are installed on the first positioning seat 43, which can facilitate the first pressing structure 5 to press beside the gluing position regardless of the length of the large label 94, ensuring the stability of the gluing position and being beneficial to ensuring the gluing quality.

[0048] For the position of one end of the label stack 93 close to the labeling device 91 to be relatively fixed on the label supporting structure 2, the second pressing structure 6 and the second pressing controller 61 can be directly installed on the frame 1 or on the side positioning seat 41. In this embodiment, the latter is illustrated. The second pressing structure 6 and the second pressing controller 61 can be provided in one set or two sets. In this embodiment, two sets are illustrated and are respectively arranged on two side positioning seats 41 to press both sides of one end of the label stack 93 close to the labeling device 91 during pressing. Of course, when one set is provided, it should preferably be arranged at the side positioning seat 41 on the starting side of glue application, and this solution should also be within the protection scope of the present utility model.

[0049] During the use of this embodiment, the height controller 3 drives the label supporting structure 2 to lower to a lower position, the first flipping seat 434 flips away from the label supporting structure 2, and a label stack 93 is placed on the label supporting structure 2. During the placing process, the label stack 93 abuts against the second positioning structure 451 to form one - end positioning. The side positioning adjustment structure 42 is used to adjust the two side positioning seats 41 to approach each other until the two side positioning structures 411 on both sides abut against the label stack 93 to form side positioning. The first flipping seat 434 reclines on the first positioning seat 42 again, and the far - label positioning adjustment structure 44 is used to adjust the first positioning structure 431 to the position where it abuts against the label stack 93 to form the positioning of the other end. Thus, the purpose of stacked storage is achieved.

[0050] The height controller 3 controls the label supporting structure 2 to keep the uppermost large label 94 in the label stack 93 at a fixed height all the time. The first pressing structure 5 and the second pressing structure 6 respectively press both ends of the large label 94. The first positioning structure 431 and the second positioning structure 451 lower under the control of their respective telescopic controllers, and smooth glue application is carried out at both ends of the uppermost large label 94 close to and away from the labeling device 91. When inputting, the first pressing controller 51 drives the first pressing structure 5 to release the pressing, the second pressing controller 61 drives the second pressing structure 6 to move away from directly above the large label 94 to avoid the label supply path, and the first positioning structure 431 and the second positioning structure 451 rise again to a position higher than the uppermost large label 94 under the control of their respective telescopic controllers. The uppermost large label 94 with glue applied is convenient to be lifted and fed forward into the labeling device 91 for labeling, which is beneficial to realizing the full - automation labeling of the large label 94.

[0051] The basic principle, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A label stack supply device, arranged in the positive direction of the labeling device, comprises a frame, and is characterized in that: A vertically movable label holding structure is installed on the frame, and a height controller is provided between the label holding structure and the frame; a label positioning mechanism for limiting the position of a large label is provided on the frame; the label holding structure includes a near-sticking end close to the labeling device and a far-sticking end away from the labeling device, a first pressing structure is installed on the frame at the far-sticking end, and a first pressing controller is provided between the first pressing structure and the frame; a second pressing structure is installed on the frame at the near-sticking end, and a second pressing controller for driving the second pressing structure to leave the top of the large label is provided between the second pressing structure and the frame.

2. The label stack supply device according to claim 1, characterized in that: The second pressing and holding controller includes a rotation cylinder arranged at the side of the proximal end, and the second pressing and holding structure is fixedly arranged on the driving end of the rotation cylinder.

3. The label stack supply device according to claim 1, characterized in that: The label positioning mechanism includes a first positioning seat installed on the frame and located at the far-end, a first positioning structure with a supporting surface extending upward from the label supporting structure is vertically movably installed on the first positioning seat, and a first telescopic controller is provided between the first positioning structure and the first positioning seat; a far-end positioning adjustment structure is provided between the first positioning seat and the frame, and a first avoidance long opening corresponding to the first positioning structure is provided on the label supporting structure.

4. The label stack supply device according to claim 3, characterized in that: The first positioning seat is supported by a first flip seat, the first positioning structure is installed on the first flip seat, and one end of the first flip seat away from the label holding structure is hingedly connected to the first positioning seat.

5. The label stack supply device according to claim 3, characterized in that: The first pressing controller and the first pressing structure are installed on the first positioning seat.

6. The label stack supply device according to claim 1, characterized in that: The label positioning mechanism includes a second positioning seat installed on the frame and located at the proximal end, a second positioning structure with a supporting surface extending upward from the label holding structure is vertically movably installed on the second positioning seat, and a second telescopic controller is provided between the second positioning structure and the second positioning seat.

7. The label stack supply device according to claim 1, characterized in that: The label positioning mechanism includes two side positioning seats installed on the frame and respectively located on both sides of the label supporting structure. The two side positioning seats are slidably arranged in a direction approaching or moving away from the label supporting structure, and a side positioning adjustment structure is provided between the two side positioning seats and the frame; each of the side positioning seats is respectively fixed with a side positioning structure that extends upward from a supporting surface of the label supporting structure, and the label supporting structure is provided with a side avoidance groove corresponding to each of the side positioning structures.

8. The label stack supply device according to claim 7, characterized in that: The second pressing structure and the second pressing controller are installed on the side positioning seat.

9. The label stack supply device according to claim 1, characterized in that: The first pressing controller comprises two first pressing cylinders respectively arranged at two sides of the distal end, and the first pressing structure is fixedly mounted on the driving ends of the two first pressing cylinders.

10. The label stack supply device according to claim 1, characterized in that: The height controller comprises a height transmission screw rotatably mounted on the frame, a height transmission screw hole matching with the height transmission screw is arranged on the label supporting structure, and the height transmission screw is connected to a height control motor.

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