Label waste winding device

Abstract

The invention relates to the field of label processing, in particular to a label waste winding device which comprises a rack and a winding roller, a roller shaft is coaxially and fixedly connected to the winding roller, the roller shaft is rotationally connected to the rack, a fixing frame is fixedly connected to the winding roller and located on the outer side of the circumference of the winding roller, and a gap is formed between the fixing frame and the circumferential side face of the winding roller. A pressing block slides on the fixing frame in a sealing mode, one end of the pressing block is located in the fixing frame, the other end of the pressing block is located on the outer side of the fixing frame and faces the circumferential side face of the winding roller, a first air cavity is formed in the fixing frame, and a first elastic piece used for pulling the pressing block is arranged in the first air cavity; and a main air channel is formed in the roller shaft, the main air channel and the roller shaft are coaxially arranged, a first branch air channel is formed in the winding roller, the first branch air channel communicates with the first air cavity, and the first branch air channel communicates with the main air channel. By means of the scheme, when waste starts to be wound around the wind-up roller, the waste and the wind-up roller can be pressed and fixed, and the waste can be wound around the wind-up roller easily.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of label processing, in particular to a label waste winding device. BACKGROUND

[0002] Label die cutting refers to the process of cutting label material (such as paper, plastic, cloth, etc.) according to certain shapes, sizes and patterns through die cutting process.

[0003] After the label is subjected to the die cutting process, the waste material after being torn off from the label needs to be manually wound on the winding roller, the winding roller winds the waste material, and the effective label left after the waste material is torn off from the label continues to be conveyed to the next process. Before the waste material is wound on the winding roller, a winding paper is first attached to the winding roller by adhesive tape, and then the waste material is manually wound on the winding paper, and the winding paper is subsequently rotated with the winding roller, so as to realize the continuous winding of the waste material on the winding paper. The purpose of attaching the winding paper to the winding roller is to separate the waste material from the winding roller, and after the winding of the waste material is completed, the winding paper and the waste material are taken off from the winding roller as a whole, so as to realize the separation of the wound waste material from the winding roller.

[0004] Therefore, at present, before the waste material is wound, the winding paper needs to be manually attached to the winding roller, and then the waste material is manually wound on the surface of the winding paper, which is relatively troublesome, and during the initial winding of the waste material on the winding roller, the waste material is not easy to be wound on the winding roller due to the lack of fixation of the waste material to the winding roller.

[0005] In addition, although the winding paper is provided to separate the winding roller from the waste material, after the winding of the waste material is completed, the winding paper is tightly wrapped by the waste material, and the winding paper is tightly attached to the winding roller, which makes it difficult to take the waste material off from the winding roller. SUMMARY

[0006] The present application aims to provide a label waste winding device to solve the problem that the winding roller is not easy to wind the waste material due to the lack of fixation of the waste material to the winding roller during the initial winding of the waste material on the winding roller.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a label waste winding device, comprising a rack and a winding roller, the winding roller is coaxially fixedly connected with a roller shaft, the roller shaft is rotatably connected to the rack, the winding roller is fixedly connected with a fixing frame, the fixing frame is located outside the circumference of the winding roller, there is a gap between the fixing frame and the circumferential side surface of the winding roller, the fixing frame is sealingly slidably provided with a pressing block, one end of the pressing block is located inside the fixing frame, the other end of the pressing block is located outside the fixing frame and faces the circumferential side surface of the winding roller, the fixing frame is provided with a first air cavity, the end of the pressing block is slidably located in the first air cavity, and the first air cavity is provided with a first elastic member for pulling the pressing block. The roll shaft is provided with a total air passage, the total air passage is coaxial with the roll shaft, the inside of the winding roll is provided with a first branch air passage, the first branch air passage is communicated with the first air cavity, and the first branch air passage is communicated with the total air passage; and the end, away from the winding roll, of the total air passage is connected with an air source with air charging and air pumping functions.

[0008] The principle and advantages of the scheme are as follows: the rack is used for supporting the winding roll, the rotation of the winding roll is realized through the rotation of the roll shaft on the rack. When it is needed to wind the waste material, the end of the waste material needs to be fixed on the winding roll, at this time, the gas is not introduced into the first branch air passage, the air pressure in the first air cavity is small, the pressing block is in the retracted state under the elastic force of the first elastic member, the retracted state means that there is a gap between the pressing block and the circumferential surface of the winding roll (the pressing block does not necessarily completely enter into the first air cavity), the end of the waste material is placed between the pressing block and the circumferential surface of the winding roll, and then the gas is introduced into the first branch air passage, the gas enters into the first air cavity through the first branch air passage, the air pressure in the first air cavity is increased, the pressing block slides under the air pressure in the first air cavity and overcomes the elastic force of the first elastic member, the pressing block approaches the circumferential surface of the winding roll, and the pressing block compresses the waste material, so that the fixing of the waste material and the winding roll is realized.

[0009] After the winding roll and the waste material are fixed, the winding roll is then rotated, the winding roll winds the waste material cut by the die cutting, the waste material cut by the die cutting is wound on the winding roll, and the effective label continues to be conveyed to the next process. When the winding of the waste material by the winding roll is completed, the gas in the first air cavity is pumped out through the first branch air passage, the air pressure in the first air cavity is reduced, the pressing block moves back into the first air cavity under the action of the first elastic member, the pressing block no longer compresses the end of the waste material, and there is a gap between the pressing block and the circumferential surface of the winding roll, so that when the wound waste material is taken off from the winding roll, the pressing block will not compress the end of the waste material to hinder the taking off of the waste material from the winding roll.

[0010] In summary, through the scheme of the present application, the fixing of the waste material and the winding roll is realized before the winding of the waste material on the winding roll, and the winding roll is easy to wind the waste material. Before the winding of the waste material, the adhesive tape is not needed to be used for pasting the winding paper on the winding roll, only the waste material needs to be placed between the pressing block and the circumferential surface of the winding roll, and the pressing block is pressed to the waste material, so that the operation is more simple and convenient.

[0011] Preferably, as an improvement, the winding roller is provided with a plurality of supporting units, the plurality of supporting units are arranged around the circumferential side of the winding roller; each supporting unit comprises a second air cavity and a supporting block, one end of the supporting block is located in the second air cavity, and the other end of the supporting block is located outside the winding roller; the second air cavity is provided with a second elastic element for pulling the supporting block, the inside of the winding roller is provided with a second gas distribution channel, the second gas distribution channel is in communication with the second air cavity, and the second gas distribution channel is in communication with the total gas channel.

[0012] Therefore, in the process of winding the waste material on the winding roller, the second gas distribution channel is filled with gas, the gas pressure in the second air cavity is relatively large, and the gas pressure in the second air cavity makes the supporting block extend out of the second air cavity by overcoming the elastic force of the second elastic element. The plurality of supporting blocks abut against the inner wall of the wound waste material, thereby supporting the waste material, so that the waste material can be uniformly and stably wound on the winding roller. Compared with not providing the supporting unit, the wound waste material is prevented from protruding excessively at the part of the fixed frame on the winding roller.

[0013] In addition, after the waste material is wound, the wound waste material needs to be taken off from the winding roller. At this time, the gas in the second air cavity is discharged through the second gas distribution channel, the gas pressure in the second air cavity is reduced, and the supporting block is recovered into the second air cavity under the pulling force of the second elastic element (the supporting block does not necessarily completely enter the second air cavity). The end of the supporting block no longer abuts against the inner wall of the wound waste material, and the abutting force of the supporting block against the inner wall of the wound waste material disappears. The diameter of the inner wall of the wound waste material is larger than the diameter of the winding roller. Compared with the prior art, the wound waste material can be easily taken off from the winding roller, the operation is simple and convenient, and the problem that the waste material is not easy to be taken off from the winding roller is solved.

[0014] Preferably, as an improvement, the fixed frame is provided with a sliding block which slides sealingly, one end of the sliding block is located in the first air cavity, the other end of the sliding block is located outside the side of the fixed frame away from the winding roller, and the first elastic element is connected between the sliding block and the pressing block.

[0015] Therefore, the waste material is wound on the winding roller, and the first air cavity is filled with gas. The end of the sliding block extends out of the side of the fixed frame away from the winding roller under the action of the gas pressure, and the end of the sliding block abuts against the inner wall of the wound waste material, thereby supporting the waste material. Thus, the sliding block and the supporting block jointly support the wound waste material. After the waste material is wound, the wound waste material needs to be taken off from the winding roller. At this time, the gas in the first air cavity is discharged through the first gas distribution channel, the gas pressure in the first air cavity is reduced, and the sliding block is recovered into the first air cavity under the pulling force of the first elastic element. The end of the sliding block no longer abuts against the inner wall of the wound waste material, and the abutting force of the sliding block against the inner wall of the wound waste material disappears, so that the wound waste material can be easily taken off from the winding roller, and the operation is simple and convenient.

[0016] Furthermore, a first elastic member is connected between the sliding block and the pressing block. When the air pressure in the first air chamber decreases, the sliding block and the pressing block move closer to each other under the action of the first elastic member, causing both the pressing block and the sliding block to retract into the first air chamber. The pressing block no longer presses against the end of the waste material, and the sliding block no longer presses against the inner wall of the rolled waste material. Therefore, by inflating or deflating the first air chamber, the movement of the sliding block and the pressing block can be controlled simultaneously.

[0017] Preferably, as an improvement, the distance between the end of the sliding block outside the first air cavity and the circumferential side of the winding roller is equal to the distance between the end of the supporting block outside the second air cavity and the circumferential side of the winding roller.

[0018] Preferably, as an improvement, there are at least two support units, and the multiple support units and the fixing frame are evenly distributed around the circumference of the winding roller.

[0019] Preferably, as an improvement, sliding grooves are provided in the first air cavity and the second air cavity, and limiting blocks are provided on the sliding block, the pressing block and the supporting block, and the limiting blocks are slidably arranged in the corresponding sliding grooves.

[0020] Therefore, when the sliding block, the pressing block and the supporting block slide, the limit block slides in the sliding groove. When the first air cavity and the second air cavity are filled with gas, the end of the sliding groove abuts against the limit block for limiting, thereby preventing the sliding block, the pressing block and the supporting block from sliding out of the corresponding air cavity.

[0021] Preferably, as an improvement, a gear is coaxially fixedly connected to the roller shaft. Thus, by driving the gear, the gear drives the roller shaft to rotate, thereby realizing the rotation of the winding roller.

[0022] Preferably, as an improvement, a rotary joint is rotatably connected to the end of the roller shaft away from the winding roller, and the air source is connected to the rotary joint. Thus, by evacuating or inflating the rotary joint, the total air passage is evacuated or inflated. When the roller shaft rotates, the roller shaft and the rotary joint rotate in coordination, and the rotary joint is in a stationary state, thereby not affecting the connection between the rotary joint and the air source.

[0023] Preferably, as an improvement, the pressing block, the sliding block and the supporting block are all made of rubber; or the pressing block, the sliding block and the supporting block all include an inner core and rubber covering the outer side of the inner core.

[0024] Preferably, as an improvement, the roller is rotatably connected to the frame via a bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a three-dimensional diagram of a label waste winding device.

[0026] Figure 2 for Figure 1Left view of the middle winding roller.

[0027] Figure 3 Schematic diagram of the winding roller winding the waste material. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: frame 1, winding roller 2, fixed frame 3, sliding block 4, pressure block 5, first air cavity 6, first elastic member 7, limit block 8, slide 9, main air duct 10, bearing 11, gear 12, rotating joint 13, first guide roller 14, second guide roller 15, die-cut label 16, waste 17, valid label 18, support block 19, second air cavity 20, second elastic member 21, second sub-air duct 22, first sub-air duct 23.

[0029] The embodiment is basically as shown in the attached Figures 1-3 The figure shows a waste label winding device, comprising a frame 1 (a portion of the frame 1 is shown schematically) and a take-up roller 2. A roller shaft is coaxially fixedly connected to the take-up roller 2, and the roller shaft is rotatably connected to the frame 1 via a bearing 11. A gear 12 is coaxially fixed to the roller shaft (e.g., secured by a key connection). A motor is mounted on the frame 1, and a drive gear is coaxially fixed to the motor's output shaft. The drive gear meshes with gear 12 on the roller shaft. Rotation of the motor drives the drive gear, which in turn drives gear 12 on the roller shaft. This rotation of the roller shaft causes the take-up roller 2 to rotate. The diameter of the take-up roller 2 in this embodiment can be 10 cm.

[0030] In this embodiment, a mounting bracket 3 is fixedly connected to the winding roller 2. The mounting bracket 3 is L-shaped, with one short side and the other long side. One end of the short side of the mounting bracket 3 is bolted to the circumferential side of the winding roller 2. The long side of the mounting bracket 3 is located outside the circumference of the winding roller 2 and is parallel to the winding roller 2. A gap exists between the long side of the mounting bracket 3 and the circumferential side of the winding roller 2. This gap can be 0.5-1 cm.

[0031] A pressure block 5 is sealed and slidably mounted on the long side of the fixed frame 3 in the radial direction of the winding roller 2. One end of the pressure block 5 is located inside the fixed frame 3, and the other end of the pressure block 5 is located outside the fixed frame 3 and faces the circumferential side of the winding roller 2 (the other end of the pressure block 5 is located between the fixed frame 3 and the winding roller 2). A first air cavity 6 is provided on the fixed frame 3, and one end of the pressure block 5 is sealed and slidably mounted in the first air cavity 6. A first elastic member 7 for pulling the pressure block 5 is provided in the first air cavity 6. The first elastic member 7 is specifically a tension spring, and the end of the first elastic member 7 is fixed to the end of the pressure block 5 by hooking. In this embodiment, there are multiple first elastic members 7, and the multiple first elastic members 7 are distributed along the length of the pressure block 5.

[0032] A sliding block 4 is sealingly and slidably connected to the fixed frame 3, one end of the sliding block 4 is located in the first air cavity 6, and the other end of the sliding block 4 is located outside the fixed frame 3 away from the winding roller 2. The first elastic member 7 is connected between the sliding block 4 and the pressing block 5, and the end of the first elastic member 7 is fixed on the end of the sliding block 4 by hooking.

[0033] The winding roller 2 is provided with a plurality of support units, the number of support units is at least two, and the support units are uniformly distributed around the circumferential side of the winding roller 2. Figure 2 As shown in the figure, three support units are taken as an example for illustration in the embodiment. The fixed frame 3 and the plurality of support units are uniformly distributed around the circumferential side of the winding roller 2. Each support unit includes a second air cavity 20 and a support block 19, so the number of support blocks 19 and second air cavities 20 in the embodiment is three. One end of the support block 19 is located in the second air cavity 20, and the other end of the support block 19 is located outside the winding roller 2. The support block 19 is sealingly and slidably connected in the second air cavity 20. The second air cavity 20 is provided with a second elastic member 21 for pulling the support block 19. The second elastic member 21 in the embodiment is a tension spring, one end of the second elastic member 21 is hooked on the end of the support block 19, and the other end of the second elastic member 21 is hooked on the inner wall of the second air cavity 20.

[0034] Since the pressing block 5 and the sliding block 4 are sealingly and slidably connected in the first air cavity 6, and the support block 19 is sealingly and slidably connected in the second air cavity 20, the pressing block 5, the sliding block 4 and the support block 19 can be made of rubber, or the pressing block 5, the sliding block 4 and the support block 19 each include a hard inner core and a rubber coated on the outer side of the inner core. The rubber contacts the corresponding air cavity, and the inner core is used to support the rubber and to connect with the corresponding elastic member. In this way, the rubber itself has a sealing effect, thereby realizing the corresponding sealing and sliding connection.

[0035] In the embodiment, the distance between the end of the sliding block 4 located outside the first air cavity 6 and the circumferential side of the winding roller 2 is equal to the distance between the end of the support block 19 located outside the second air cavity 20 and the circumferential side of the winding roller 2, and each distance is equal to 1.5-2 cm.

[0036] In order to make the pressing block 5, the sliding block 4 and the supporting block 19 slide stably in the corresponding air cavity, avoid the pressing block 5 and the sliding block 4 from separating from the first air cavity 6 of the fixed frame 3, and avoid the supporting block 19 from separating from the second air cavity 20 of the winding roller 2. The first air cavity 6 and the second air cavity 20 are each provided with a sliding groove 9 at both ends, and the two ends of the sliding block 4, the two ends of the pressing block 5 and the two ends of the supporting block 19 are each fixedly provided with a limiting block 8 which is slidably arranged in the corresponding sliding groove 9. In this way, when the sliding block 4, the pressing block 5 and the supporting block 19 slide in the corresponding air cavity, the limiting block 8 slides in the sliding groove 9, and through the sliding cooperation of the limiting block 8 and the sliding groove 9, the sliding block 4, the pressing block 5 and the supporting block 19 are guided to slide, and at the same time, when the sliding block 4, the pressing block 5 and the supporting block 19 slide outward to a certain extent, the limiting block 8 abuts against the end of the sliding groove 9, so that the sliding block 4, the pressing block 5 and the supporting block 19 are prevented from sliding out of the corresponding air cavity and falling off.

[0037] The roller shaft in the embodiment is internally provided with a total air passage 10 which is coaxially arranged with the roller shaft, the winding roller 2 is internally provided with a first branch air passage 23 and three second branch air passages 22, the first branch air passage 23 is communicated with the first air cavity 6, and the first branch air passage 23 and the second branch air passages 22 are all communicated with the total air passage 10. The plurality of second branch air passages 22 are respectively communicated with the plurality of second air cavities 20.

[0038] The shaft roller is rotatably connected with a rotating joint 13 at one end away from the winding roller 2, and lubricating oil is arranged between the inner wall of the rotating joint 13 and the outer wall of the roller shaft, so as to reduce the rotating friction between the rotating joint 13 and the roller shaft, and the lubricating oil can also play a sealing role. The rotating joint 13 is connected with a gas source through a gas pipe, and the gas source is specifically a gas pump which has the functions of inflating and exhausting.

[0039] The specific implementation process is as follows: when it is needed to wind the waste material 17, the end of the waste material 17 needs to be fixed on the winding roller 2, at this time, instead of inflating the total air passage 10 with gas, the gas in the total air passage 10, the first branch air passage 23, the second branch air passages 22, the first air cavity 6 and the second air cavity 20 is exhausted by the gas pump. After the gas in the first air cavity 6 and the second air cavity 20 is exhausted, the air pressure in the first air cavity 6 and the second air cavity 20 is reduced, the pressing block 5 and the sliding block 4 are close to each other under the pulling action of the first elastic member 7, and the pressing block 5 and the sliding block 4 are both retreated into the first air cavity 6, and at the same time, the supporting block 19 is retreated into the second air cavity 20 under the pulling action of the second elastic member 21.

[0040] Since the pressing block 5 retreats into the first air cavity 6, there is a gap between the pressing block 5 and the circumferential surface of the winding roller 2, and the pressing block 5 is combined with the sliding block 4 to form a pressing surface which is in contact with the waste material 17. Figure 3As shown, the end of the waste material 17 is manually put into the gap between the pressing block 5 and the circumferential surface of the winding roller 2, and then the gas pump fills the gas into the total gas channel 10, the gas enters the first gas cavity 6 through the first gas branch 23, the gas pressure in the first gas cavity 6 becomes large, the pressing block 5 slides under the action of the gas pressure in the first gas cavity 6 and overcomes the elastic force of the first elastic member 7, the pressing block 5 approaches the circumferential surface of the winding roller 2, and the pressing block 5 compresses the waste material 17, so as to realize the fixation of the waste material 17 and the winding roller 2. At the same time, the sliding block 4 slides under the action of the pressure of the first gas cavity 6 and overcomes the elastic force of the first elastic member 7, and the sliding block 4 slides away from the circumferential surface of the winding roller 2.

[0041] At the same time, the gas in the total gas channel 10 enters the second gas cavity 20 through the second gas branch 22, the gas pressure in the second gas cavity 20 becomes large, and the gas pressure in the second gas cavity 20 makes the support block 19 move outward from the second gas cavity 20 and overcome the elastic force of the second elastic member 21 until the limiting block abuts against the end of the sliding groove.

[0042] Subsequently, the motor is started, the motor drives the driving gear to rotate, the driving gear drives the gear 12 to rotate, the gear 12 drives the shaft to rotate, and thus the winding roller 2 rotates, and the waste material 17 on the winding roller 2 is wound more and more. Figure 3 As shown, the die-cut label 16 is conveyed to the left, the die-cut label 16 passes through the first guide roller 14, the waste material 17 is wound on the winding roller 2, and after the waste material 17 and the effective label 18 are separated, the effective label 18 passes through the second guide roller 15 and is continuously conveyed to the next process.

[0043] Thus, with the rotation of the winding roller 2, the waste material 17 on the winding roller 2 is wound more and more.

[0044] When the winding of the waste material 17 by the winding roller 2 is completed, the waste material 17 needs to be taken off from the winding roller 2, at this time, the gas pump extracts the gas in the first gas cavity 6 and the second gas cavity 20 through the total gas channel 10, the first gas branch 23 and the second gas branch 22, and the gas pressure in the first gas cavity 6 and the second gas cavity 20 decreases. When the gas pressure in the first gas cavity 6 decreases, the pressing block 5 and the sliding block 4 both move back into the first gas cavity 6 under the action of the pulling force of the first elastic member 7, the pressing block 5 no longer compresses the end of the waste material 17, and there is a gap between the pressing block 5 and the circumferential side surface of the winding roller 2, and the end of the sliding block 4 no longer abuts against the inner wall of the wound waste material 17.

[0045] For the second air cavity 20, the air pressure in the second air cavity 20 is also reduced, and the support block 19 moves to the inside of the second air cavity 20 under the pulling force of the second elastic member 21, so that the end of the support block 19 no longer abuts against the inner wall of the wound waste 17, and the abutting force of the support block 19 against the inner wall of the wound waste 17 disappears. Since the support block 19 and the sliding block 4 are both in the retreat action and no longer abut against the inner wall of the wound waste 17, and the diameter of the inner wall of the wound waste 17 is greater than the diameter of the winding roller 2, compared with the prior art, the wound waste 17 can be easily taken off from the winding roller 2, and the operation is simple and convenient, and the problem that the waste 17 is not easy to be taken off from the winding roller 2 is solved.

[0046] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific embodiments in the specification can be used to explain the content of the claims.

Claims

1. A label waste winding device, comprising a frame and a winding roller, wherein the winding roller is coaxially fixedly connected to a roller shaft, and the roller shaft is rotatably connected to the frame, characterized in that: The winding roller is fixedly connected to a fixing frame, the fixing frame is located outside the circumference of the winding roller, a gap is formed between the fixing frame and the circumferential side surface of the winding roller, a pressure block is sealed and slidably provided on the fixing frame, one end of the pressure block is located inside the fixing frame, and the other end of the pressure block is located outside the fixing frame and faces the circumferential side surface of the winding roller, a first air cavity is provided in the fixing frame, the end of the pressure block is slidably located in the first air cavity, and a first elastic member for pulling the pressure block is provided in the first air cavity; A main air duct is provided on the roller shaft, and the main air duct and the roller shaft are coaxially arranged. A first branch air duct is provided inside the winding roller, and the first branch air duct is connected to the first air cavity, and the first branch air duct is connected to the main air duct; the end of the main air duct away from the winding roller is connected to an air source with inflation and exhaust functions.

2. The label waste winding device according to claim 1, characterized in that: The winding roller is provided with multiple support units, which are distributed around the circumferential side of the winding roller; each support unit includes a second air cavity and a support block, one end of the support block is located in the second air cavity, and the other end of the support block is located on the outside of the winding roller; a second elastic member for pulling the support block is provided in the second air cavity, and a second sub-air duct is provided inside the winding roller, the second sub-air duct is connected with the second air cavity, and the second sub-air duct is connected with the main air duct.

3. The label waste winding device according to claim 2, characterized in that: A sliding block is sealed and slidably mounted on the fixing frame. One end of the sliding block is located in the first air cavity, and the other end of the sliding block is located outside the fixing frame away from the winding roller. The first elastic member is connected between the sliding block and the pressing block.

4. The label waste winding device according to claim 3, characterized in that: The distance between the end of the sliding block outside the first air cavity and the circumferential side of the winding roller is equal to the distance between the end of the supporting block outside the second air cavity and the circumferential side of the winding roller.

5. The label waste winding device according to claim 3, characterized in that: There are at least two supporting units, and the multiple supporting units and the fixing frame are evenly distributed around the circumference of the winding roller.

6. The label waste winding device according to claim 3, characterized in that: Slide grooves are provided in the first air cavity and the second air cavity, and limit blocks are provided on the sliding block, the pressing block and the supporting block. The limit blocks are slidably arranged in the corresponding slide grooves.

7. The label waste winding device according to claim 1, characterized in that: A gear is coaxially fixedly connected to the roller shaft.

8. The label waste winding device according to claim 1, characterized in that: One end of the roller shaft away from the winding roller is rotatably connected to a rotary joint, and the air source is connected to the rotary joint.

9. The label waste winding device according to claim 3, characterized in that: The pressing block, sliding block and supporting block are all made of rubber; or the pressing block, sliding block and supporting block all include an inner core and rubber covering the outer side of the inner core.

10. The label waste winding device according to claim 1, characterized in that: The roller shaft is rotatably connected to the frame through a bearing.

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