Label printing machine

Abstract

The label printing machine comprises a printing part, a drying cavity and a material receiving box, a reciprocating conveying supporting plate and a reversing adsorption device are arranged in the drying cavity, an air hole is formed in the reciprocating conveying supporting plate and connected with the reversing adsorption device, and the reciprocating conveying supporting plate is connected with a reciprocating driving mechanism. The reversing adsorption device comprises a negative pressure cavity and a positive pressure cavity, the control push rod controls the position of the movable valve plate and completes air path switching, a first valve hole and a second valve hole are formed in the movable valve plate, the section width of the first valve hole is larger than that of the second valve hole, and therefore adsorption force can not be interrupted; the air holes of the supporting plate without adsorption force can provide reverse blowing force, friction force between the supporting plate moving in the reverse direction and a label is reduced, the movable supporting plate moving in a reciprocating mode is adopted for conveying the sticker, conveying is stable and high in speed, the whole sticker makes complete contact with the surface of the preheating supporting plate, heating is even, the ironing effect is achieved, and therefore the drying efficiency is improved, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the field of printing machinery, in particular to a label printing machine with an energy-saving drying box. Background Art

[0002] The use of labels has been very widespread, and more and more waterproof materials are used for labels, such as plastic films. Due to the poor water absorption of plastic films, the ink is not easy to dry after printing by the printer. The friction between two labels will cause the ink on the surface of the plastic film to diffuse and be scratched, which seriously affects the product quality.

[0003] A Chinese patent with application number CN201911263469.3 discloses a label printer, including a label printer body, which is provided with a feeding component, a printing component and a receiving component, and also includes: a roller component, which is provided with multiple rollers arranged in a line and fixed between the printing component and the receiving component, the roller component includes: a roller, the wheel cores at both ends of which are respectively fixed to a frame through bearings, the roller is a hollow structure, and the wheel core is provided with a core hole; an infrared heating tube, the two ends of which are respectively passed through the core hole of the wheel core and fixed to the frame, the infrared heating tube is not in contact with the wheel core, and the electrodes of the infrared heating tube are connected to a power supply; a light shielding plate, which is composed of more than two vertical bars and multiple horizontal bars of equal width, the light shielding plate is rolled into a barrel shape and fixed on the circumferential inner wall of the roller, wherein multiple horizontal bars near the center of the infrared heating tube are densely distributed; a motor, which drives the roller to rotate, and a box, which is fixed to the frame, and the multiple roller assemblies are located in the box. The present invention has the beneficial effects of fast printing speed, energy saving, and improved printing quality.

[0004] The above scheme uses roller-driven labels. Since the roller is in linear contact with the sticker, the contact surface is small and the sticker is heated unevenly, it is easy to cause bending, deformation, and edge warping. In addition, the warping or sinking caused by the deformation of the sticker will further affect the direction of travel and cause paper jams. Summary of the invention

[0005] The purpose of the present invention is to provide a label printing machine, which adopts a movable flat plate to convey stickers, thereby increasing the heating area, reducing the overall energy consumption of the drying box, and solving the problems existing in the prior art such as small contact surface through roller drive, uneven heating, easy bending and deformation of stickers, edge warping, and the inability to move in a straight line in the preset direction, resulting in paper jams.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A label printing machine comprises a printing section, a drying chamber and a material receiving box. The printing section comprises a material storage box, a feeding device and a printing device. The material outlet of the printing device is connected to the material inlet of the drying chamber. The material outlet of the drying chamber is connected to the material receiving box. A reflective cover is arranged in the shell of the drying chamber. An infrared heating tube, a reciprocating conveying pallet and a reversing adsorption device are arranged inside the drying chamber. Air holes are arranged on the reciprocating conveying pallet, and the air holes are connected to the reversing adsorption device. The reciprocating conveying pallet passes through the material inlet and the material outlet of the drying chamber. The reciprocating conveying pallet is connected to a reciprocating driving mechanism.

[0008] The first movable support plate and the second movable support plate are both made of multi-layer boards, including an ironing board layer at the top layer, a heat insulation layer at the bottom layer, and an electric heating layer at the middle layer. The heat insulation layer can prevent heat loss, and the electric heating layer evenly transfers heat to the ironing board layer, so that the label above can be ironed and heated at the bottom during the transfer process, and the whole is evenly heated to avoid wrinkles and warping.

[0009] The feeding device feeds the label from the material storage box into the printing device. After printing, the label is fed into the reciprocating conveying pallet of the drying chamber, and the label is sent out of the drying chamber by the reciprocating conveying pallet and collected in the receiving box. During the conveying process in the drying chamber, the ink on the label can be dried quickly due to the effect of the infrared heating tube and the reflective cover. The reciprocating conveying pallet can ensure that the label is in a flat state during the conveying process, and will not bend or deform, thereby avoiding the occurrence of warping, debonding, paper jams, etc. And the heat is evenly distributed, which can effectively improve the stability of the equipment.

[0010] The reciprocating conveying pallet includes a first movable pallet and a second movable pallet, both of which are composed of a plurality of strip plates arranged at intervals, and the first movable pallet and the second movable pallet are cross-matched, the upper plane is flush, and the label is located on the plane, each pallet has a linear degree of freedom in the direction from the feed port to the discharge port of the drying chamber, and the reciprocating drive mechanism provides driving force for the first movable pallet and the second movable pallet, so that the first movable pallet and the second movable pallet can reciprocate. The label is placed on the reciprocating conveying pallet. Since the friction between the label and the reciprocating conveying pallet is small, and the first movable pallet and the second movable pallet move at a fast speed and exert opposite forces on the label, the movement trajectory of the label will be uncontrollable. Therefore, it is necessary to provide air holes on both the first movable pallet and the second movable pallet, and the air holes are connected to the reversing adsorption device. By continuously changing the adsorption force between the first movable pallet and the second movable pallet, that is, only providing adsorption force for the movable pallet moving in the outlet direction, and not providing adsorption force or providing blowing force to reduce friction for the movable pallet moving in the opposite direction, the label can be controlled to move along the outlet direction.

[0011] The reciprocating drive mechanism includes a fixed slide rail, a slider, a first connecting rod, a second connecting rod, a push rod, a cam and a reset spring. The slider is installed on the fixed slide rail and can slide in a direction perpendicular to the reciprocating conveying pallet. The first movable pallet and the second movable pallet are respectively connected to the slider through the first connecting rod and the second connecting rod. The slider is connected to the push rod, and the cam and the push rod cooperate. The slider is connected to the reset spring. The cam pushes the slider to move upward. When the cam reaches the highest point, the slider stays for a short time, and then moves downward under the action of the reset spring. When it reaches the lowest point, it stays for a short time and then continues to move upward. The corresponding first movable pallet and the second movable pallet will stay for a short time when they reach the limit position. During this period, the reversing adsorption device completes the switching adsorption between the first movable pallet and the second movable pallet.

[0012] The above scheme can realize that the label follows the movement of the first movable support plate or the second movable support plate. In order to further improve the stability, the following conditions are required: 1. When switching the adsorption between the first movable support plate and the second movable support plate, it can be ensured that there is no interruption in the adsorption force, and it is necessary to ensure that at least one movable support plate has adsorption force at any time; 2. During the movement of the movable support plate, the air holes of the support plate without adsorption force provide reverse blowing force, that is, reduce the friction between the support plate moving in the opposite direction and the label. The conventional scheme is to use a two-position four-way electromagnetic reversing valve in conjunction with a vacuum pump to realize a reversing adsorption device, but it cannot meet the above requirements. Therefore, the present invention designs a reversing valve body and a positive and negative pressure pump.

[0013] The reversing adsorption device includes a reversing valve body and a positive and negative pressure pump, the positive and negative pressure pump includes a negative pressure chamber and a positive pressure chamber, a fan or an air pump is arranged between the negative pressure chamber and the positive pressure chamber, the negative pressure chamber is connected to the negative pressure pipe, and the positive pressure chamber is connected to the positive pressure pipe, the reversing valve body includes a movable valve plate, a control push rod, a first air pipe and a second air pipe, the first air pipe and the second air pipe are respectively connected to the air holes on the first movable support plate and the second movable support plate, the movable valve plate is connected to the control push rod, and the control push rod controls the position switching of the movable valve plate, and a first valve hole and a second valve hole are arranged on the movable valve plate, the cross-sectional width of the first valve hole is greater than the cross-sectional width of the second valve hole, when the movable valve plate is in position one, the first air pipe is connected to the negative pressure pipe, and the second air pipe is connected to the positive pressure pipe; when the movable valve plate is in position two, the first air pipe is connected to the positive pressure pipe, and the second air pipe is connected to the negative pressure pipe; there is position three during the switching process, and the first air pipe and the second air pipe are both connected to the negative pressure pipe.

[0014] The structure of the above-mentioned reversing adsorption device can achieve the following expectations: 1. When switching adsorption between the first movable pallet and the second movable pallet, it can be ensured that there is no interruption in the adsorption force, that is, it is necessary to ensure that at least one movable pallet has adsorption force at any time; 2. During the movement of the movable pallet, the air holes of the pallet that does not have adsorption force provide reverse blowing force, that is, reduce the friction between the pallet moving in the opposite direction and the label.

[0015] The reversing adsorption device needs to complete the ventilation when the first movable support plate and the second movable support plate reach the limit position and pause. In the present invention, a cam group is used to realize the linkage between the reversing adsorption device and the reciprocating conveying support plate. A second cam is arranged coaxially with the cam, and the second cam cooperates with the control push rod of the reversing adsorption device. When the cam drives the slider to move upward through the push rod, the control push rod remains stationary during this time period; when the slider reaches the highest point, it stops for a short time, during which the control push rod moves to the left, and the reversing adsorption device completes the reversing action; when the slider starts to move downward, during this time period, the control push rod remains stationary; when the slider reaches the lowest point, it stops for a short time, during which the control push rod moves to the right, and the reversing adsorption device completes the reversing action; the above actions are repeated in a cycle.

[0016] The beneficial effects of the present invention are:

[0017] 1. Use a reciprocating movable pallet to transport stickers. The transport motion is smooth and high-speed. The sticker is in full contact with the surface of the preheated pallet, heated evenly, and plays an ironing role, thereby improving drying efficiency and reducing energy consumption.

[0018] Second, when switching between the first movable support plate and the second movable support plate for adsorption, it can be ensured that there is no interruption in the adsorption force, that is, it is ensured that at least one movable support plate has adsorption force at any time.

[0019] 3. During the movement of the movable pallet, the air holes of the pallet without adsorption force provide reverse blowing force, that is, reducing the friction between the pallet moving in the reverse direction and the label.

[0020] Fourth, the reversing adsorption device is mechanically linked with the movable support plate, that is, the reversing adsorption device needs to pause after the first movable support plate and the second movable support plate reach the limit position, during which the reversing adsorption device completes the switching of the blowing and suction forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the reciprocating conveyor plate.

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the reciprocating conveyor pallet.

[0025] Figure 4 This is the schematic diagram of the first driving mode of the reciprocating transport pallet.

[0026] Figure 5 for Figure 4 A magnified view of the local structure.

[0027] Figure 6 This is the schematic diagram of the second driving mode of the reciprocating transport pallet.

[0028] Figure 7 It is a structural schematic diagram of the reversing adsorption device in state one.

[0029] Figure 8 It is a structural schematic diagram of the reversing adsorption device in state 2.

[0030] Fig. 9 It is a structural schematic diagram of the reversing adsorption device in state three.

[0031] Fig.10 It is the principle diagram of the linkage scheme between the reciprocating conveying pallet and the reversing adsorption device.

[0032] Fig.11 for Fig.10 Schematic diagram of the three-dimensional structure of the middle cam group.

[0033] In the figure: 1--printing unit; 11--material storage box; 12--feeding device; 13--printing device; 2--drying chamber; 21--shell; 22--infrared heating tube; 23--reflection cover; 24--reciprocating conveying pallet; 241--first movable pallet; 242--second movable pallet; 243--air hole; 246--insulation layer; 245--electric heating layer; 244--ironing board layer; 25--reciprocating drive mechanism; 251--fixed slide rail; 252--slider; 253--crank; 254--driving connecting rod; 255--first connecting rod; 2 56--second connecting rod; 257--push rod; 258--cam; 259--reset spring; 2510--second cam; 26--reversing adsorption device; 261--control push rod; 262--reversing valve body; 263--positive and negative pressure pumps; 264--first air pipe; 265--second air pipe; 266--negative pressure chamber; 267--positive pressure chamber; 268--movable valve plate; 269--first valve hole; 2610--second valve hole; 2611--negative pressure pipe; 2612--positive pressure pipe; 2613--pressure relief valve; 3--material receiving box; 4--label. DETAILED DESCRIPTION

[0034] like Figure 1As shown, a label printing machine includes a printing part 1, a drying chamber 2 and a material receiving box 3, the printing part 1 includes a material storage box 11, a feeding device 12 and a printing device 13, the discharge port of the printing device 13 is connected to the feed port of the drying chamber 2, the discharge port of the drying chamber 2 is connected to the material receiving box 3, a reflective cover 23 is arranged in the shell 21 of the drying chamber 2, and an infrared heating tube 22, a reciprocating conveying pallet 24 and a reversing adsorption device 26 are arranged inside the drying chamber 2, air holes are arranged on the reciprocating conveying pallet 24, the air holes are connected to the reversing adsorption device 26, the reciprocating conveying pallet 24 passes through the feed port and the discharge port of the drying chamber 2, and the reciprocating conveying pallet 24 is connected to the reciprocating driving mechanism 25.

[0035] The feeding device 12 feeds the label 4 from the storage box 11 into the printing device 13. The printed label 4 is fed onto the reciprocating conveying pallet 24 of the drying chamber 2, and the label 4 is sent out of the drying chamber 2 by the reciprocating conveying pallet 24 and collected in the receiving box 3. During the conveying process in the drying chamber 2, the ink on the label 4 can be quickly dried due to the action of the infrared heating tube 22 and the reflective cover 23.

[0036] The reciprocating conveying support plate 24 can ensure that the label 4 is in a flat state during the conveying process, and will not bend or deform, thereby avoiding the occurrence of edge warping, debonding, paper jam, etc., and the heat is evenly distributed, which can effectively improve the stability of the equipment.

[0037] like Figure 2 As shown, the reciprocating conveying pallet 24 includes a first movable pallet 241 and a second movable pallet 242, and the first movable pallet 241 and the second movable pallet 242 are both composed of a plurality of strip plates arranged at intervals, and the first movable pallet 241 and the second movable pallet 242 are cross-matched, and the upper plane is flush, and the label 4 is located on the plane, and each pallet has a linear degree of freedom in the direction from the feed port to the discharge port of the drying chamber 2, and the reciprocating drive mechanism 25 provides driving force for the first movable pallet 241 and the second movable pallet 242, so that the first movable pallet 241 and the second movable pallet 242 can reciprocate.

[0038] The label 4 is placed on the reciprocating conveying pallet 24. Since the friction between the label 4 and the reciprocating conveying pallet 24 is relatively small, and the first movable pallet 241 and the second movable pallet 242 move at a fast speed and exert opposite forces on the label 4, the movement trajectory of the label 4 will be uncontrollable. Therefore, it is necessary to provide air holes 243 on both the first movable pallet 241 and the second movable pallet 242, and the air holes 243 are connected to the reversing adsorption device 26. By continuously changing the adsorption force between the first movable pallet 241 and the second movable pallet 242, that is, only providing adsorption force to the movable pallet moving in the exit direction, and not providing adsorption force to the movable pallet moving in the opposite direction or providing blowing force to reduce friction, the label 4 can be controlled to move in the exit direction.

[0039] Further, if Figure 3 As shown, the first movable support plate 241 and the second movable support plate 242 are both made of multi-layer boards, including an ironing board layer 244 at the top layer, a heat insulation layer 246 at the bottom layer, and an electric heating layer 245 at the middle layer. The heat insulation layer 246 can prevent heat loss, and the electric heating layer 245 evenly conducts heat to the ironing board layer 244, so that the label 4 above can be ironed and heated at the bottom during the transfer process, and the whole is evenly heated to avoid wrinkles and warping.

[0040] The reciprocating drive mechanism 25 has various implementations.

[0041] like Figure 4 and 5 As shown, in the first embodiment, the reciprocating drive mechanism 25 includes a fixed slide rail 251, a slider 252, a crank 253, a driving connecting rod 254, a first connecting rod 255 and a second connecting rod 256. The slider 252 is installed on the fixed slide rail 251 and can slide in a direction perpendicular to the reciprocating conveying pallet 24. The first movable pallet 241 and the second movable pallet 242 are connected to the slider 252 through the first connecting rod 255 and the second connecting rod 256 respectively. The slider 252 is connected to the driving connecting rod 254, and the driving connecting rod 254 is connected to the crank 253. The crank 253, the driving connecting rod 254 and the slider 252 form a crank slider mechanism. The crank 253 rotates to drive the slider 252 to move repeatedly in a straight line, and the first movable pallet 241 and the second movable pallet 242 are driven to reciprocate in the horizontal direction through the first connecting rod 255 and the second connecting rod 256.

[0042] In the above embodiment, since the movement of the first movable pallet 241 and the second movable pallet 242 is continuous and uninterrupted, the reversing adsorption device 26 will switch adsorption between the first movable pallet 241 and the second movable pallet 242 when the first movable pallet 241 and the second movable pallet 242 reach the limit position. Therefore, if the movement of the first movable pallet 241 and the second movable pallet 242 can be suspended when the reversing adsorption device 26 is in motion, it will help to improve the stability of the reciprocating transport pallet 24.

[0043] As a preference, Figure 6As shown, in the second embodiment, the reciprocating drive mechanism 25 includes a fixed slide rail 251, a slider 252, a first connecting rod 255, a second connecting rod 256, a push rod 257, a cam 258 and a return spring 259. The slider 252 is installed on the fixed slide rail 251 and can slide in a direction perpendicular to the reciprocating conveying pallet 24. The first movable pallet 241 and the second movable pallet 242 are connected to the slider 252 through the first connecting rod 255 and the second connecting rod 256 respectively. The slider 252 is connected to the push rod 257, and the cam 258 cooperates with the push rod 257. The slider 252 is connected to the return spring 259, and the cam 258 pushes the slider 252 to move upward. When reaching the highest point of the cam, the slider 252 stays for a short time, and then under the action of the return spring 259, the slider 252 moves downward. When reaching the lowest point, it stays for a short time and then continues to move upward. The corresponding first movable pallet 241 and the second movable pallet 242 will stay for a short time when reaching the limit position. During this period, the switching adsorption device 26 completes the switching adsorption between the first movable support plate 241 and the second movable support plate 242 .

[0044] The above scheme can realize that the label 4 moves with the first movable support plate 241 or the second movable support plate 242. In order to further improve the stability, the following conditions are required: 1. When switching between the first movable support plate 241 and the second movable support plate 242 for adsorption, it can be ensured that there is no interruption in the adsorption force, and it is necessary to ensure that at least one movable support plate has adsorption force at any time; 2. During the movement of the movable support plate, the air hole 243 of the support plate without adsorption force provides a reverse blowing force, that is, reduces the friction between the support plate moving in the reverse direction and the label 4. The conventional scheme is to use a two-position four-way electromagnetic reversing valve in conjunction with a vacuum pump to realize the reversing adsorption device 26, but it cannot meet the above requirements. Therefore, the present invention designs a reversing valve body 262 and a positive and negative pressure pump 263.

[0045] like Figures 7 to 9 As shown, the reversing adsorption device 26 includes a reversing valve body 262 and a positive and negative pressure pump 263, the positive and negative pressure pump 263 includes a negative pressure chamber 266 and a positive pressure chamber 267, a fan or an air pump is arranged between the negative pressure chamber 266 and the positive pressure chamber 267, the negative pressure chamber 266 is connected to the negative pressure pipe 2611, the positive pressure chamber 267 is connected to the positive pressure pipe 2612, the reversing valve body 262 includes a movable valve plate 268, a control push rod 261, a first air pipe 264 and a second air pipe 265, the first air pipe 265 and the positive pressure chamber 266 are connected to the positive pressure chamber 267, and the positive pressure chamber 267 is connected to the positive pressure chamber 267. The first air pipe 264 and the second air pipe 265 are connected to the air holes 243 on the first movable support plate 241 and the second movable support plate 242 respectively. The movable valve plate 268 is connected to the control push rod 261. The control push rod 261 controls the position switching of the movable valve plate 268. The first valve hole 269 and the second valve hole 2610 are provided on the movable valve plate 268. The cross-sectional width of the first valve hole 269 is greater than the cross-sectional width of the second valve hole 2610. When the movable valve plate 268 is located at position one, the state is as follows: Figure 7As shown, the first air pipe 264 is connected to the negative pressure pipe 2611, and the second air pipe 265 is connected to the positive pressure pipe 2612; when the movable valve plate 268 is in position 2, the state is as follows Figure 8 As shown, the first air pipe 264 is connected to the positive pressure pipe 2612, and the second air pipe 265 is connected to the negative pressure pipe 2611; there is position three during the switching process, and the state is as follows Fig. 9 As shown, the first air pipe 264 and the second air pipe 265 are both connected to the negative pressure pipe 2611.

[0046] The structure of the above-mentioned reversing adsorption device 26 can achieve the following expectations: 1. When switching adsorption between the first movable support plate 241 and the second movable support plate 242, it can be ensured that the adsorption force is not interrupted, that is, it is necessary to ensure that at least one movable support plate has adsorption force at any time; 2. During the movement of the movable support plate, the air hole 243 of the support plate that does not have adsorption force provides a reverse blowing force, that is, reduces the friction between the support plate moving in the opposite direction and the label 4.

[0047] Furthermore, the reversing adsorption device 26 needs to complete ventilation when the first movable support plate 241 and the second movable support plate 242 reach the limit position and pause. In the present invention, a cam group is used to realize the linkage between the reversing adsorption device 26 and the reciprocating conveying support plate 24.

[0048] like Fig.10 and 11 As shown, a second cam 2510 is coaxially arranged with the cam 258 , and the second cam 2510 cooperates with the control push rod 261 of the reversing adsorption device 26 .

[0049] When the cam 258 drives the slider 252 to move upward through the push rod 257, during this time period, the control push rod 261 remains stationary; when the slider 252 reaches the highest point, it stays for a short time, during this time period, the control push rod 261 moves to the left, and the reversing adsorption device 26 completes the reversing action; when the slider 252 starts to move downward, during this time period, the control push rod 261 remains stationary; when the slider 252 reaches the lowest point, it stays for a short time, during this time period, the control push rod 261 moves to the right, and the reversing adsorption device 26 completes the reversing action; the above actions are repeated in a cycle.

[0050] Preferably, the positive pressure chamber 267 is connected to the pressure relief valve 2613, which controls the pressure of the positive pressure chamber 267, thereby controlling the blowing force. Excessive blowing force may blow the label 4 off the reciprocating conveying pallet 24, while too little blowing force cannot achieve the effect of reducing friction.

[0051] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto. For ordinary technicians in this field, without departing from the principle of the present invention, the modifications made should be deemed to belong to the protection scope of the present invention.

Claims

1. A label printing machine, comprising a printing unit (1), a drying chamber (2) and a material receiving box (3), wherein the printing unit (1) comprises a material storage box (11), a feeding device (12) and a printing device (13), wherein the material outlet of the printing device (13) is connected to the material inlet of the drying chamber (2), and the material outlet of the drying chamber (2) is connected to the material receiving box (3), characterized in that: A reflective cover (23) is arranged in a shell (21) of a drying chamber (2), and an infrared heating tube (22), a reciprocating conveying pallet (24) and a reversing adsorption device (26) are arranged inside the drying chamber (2). Air holes are arranged on the reciprocating conveying pallet (24), and the air holes are connected to the reversing adsorption device (26). The reciprocating conveying pallet (24) passes through the feed port and the discharge port of the drying chamber (2), and the reciprocating conveying pallet (24) is connected to a reciprocating driving mechanism (25).

2. The label printing machine according to claim 1, characterized in that: The reciprocating conveying pallet (24) comprises a first movable pallet (241) and a second movable pallet (242), each of which is composed of a plurality of strip plates arranged at intervals, and the first movable pallet (241) and the second movable pallet (242) are cross-matched, and the upper plane is flush, and the label (4) is located on the plane, and each pallet has a linear degree of freedom in the direction from the feed port to the discharge port of the drying chamber (2), and the reciprocating drive mechanism (25) provides driving force for the first movable pallet (241) and the second movable pallet (242).

3. The label printing machine according to claim 2, characterized in that: Air holes (243) are provided on both the first movable support plate (241) and the second movable support plate (242), and the air holes (243) are connected to the reversing adsorption device (26). The first movable support plate (241) and the second movable support plate (242) are both composed of multi-layer boards, including an ironing board layer (244) located on the top layer, a heat insulation layer (246) located on the bottom layer, and an electric heating layer (245) located in the middle layer.

4. The label printing machine according to claim 3, characterized in that: The reciprocating drive mechanism (25) comprises a fixed slide rail (251), a slider (252), a crank (253), a driving connecting rod (254), a first connecting rod (255) and a second connecting rod (256); the slider (252) is installed on the fixed slide rail (251) and can slide in a direction perpendicular to the reciprocating conveying pallet (24); the first movable pallet (241) and the second movable pallet (242) are respectively connected to the slider (252) through the first connecting rod (255) and the second connecting rod (256); the slider (252) is connected to the driving connecting rod (254); the driving connecting rod (254) is connected to the crank (253); the crank (253), the driving connecting rod (254) and the slider (252) form a crank slider mechanism.

5. The label printing machine according to claim 3, characterized in that: The reciprocating drive mechanism (25) comprises a fixed slide rail (251), a slider (252), a first connecting rod (255), a second connecting rod (256), a push rod (257), a cam (258) and a return spring (259); the slider (252) is installed on the fixed slide rail (251) and can slide in a direction perpendicular to the reciprocating conveying pallet (24); the first movable pallet (241) and the second movable pallet (242) are respectively connected to the slider (252) through the first connecting rod (255) and the second connecting rod (256); the slider (252) is connected to the push rod (257); the cam (258) and the push rod (257) cooperate; and the slider (252) is connected to the return spring (259).

6. The label printing machine according to claim 5, characterized in that: The reversing adsorption device (26) comprises a reversing valve body (262) and a positive and negative pressure pump (263), wherein the positive and negative pressure pump (263) comprises a negative pressure chamber (266) and a positive pressure chamber (267), wherein a fan or an air pump is arranged between the negative pressure chamber (266) and the positive pressure chamber (267), wherein the negative pressure chamber (266) is connected to a negative pressure pipe (2611), and the positive pressure chamber (267) is connected to a positive pressure pipe (2612), wherein the reversing valve body (262) comprises a movable valve plate (268), a control push rod (261), a first air pipe (264) and a second air pipe (265), wherein the first air pipe (264) and the second air pipe (265) are respectively connected to air holes (243) on the first movable support plate (241) and the second movable support plate (242), wherein the movable valve plate (268) is connected to the control push rod (261), and ... 61), the control push rod (261) controls the position switching of the movable valve plate (268), a first valve hole (269) and a second valve hole (2610) are provided on the movable valve plate (268), the cross-sectional width of the first valve hole (269) is greater than the cross-sectional width of the second valve hole (2610), when the movable valve plate (268) is located at position one, the first air pipe (264) is connected to the negative pressure pipe (2611), and the second air pipe (265) is connected to the positive pressure pipe (2612); when the movable valve plate (268) is located at position two, the first air pipe (264) is connected to the positive pressure pipe (2612), and the second air pipe (265) is connected to the negative pressure pipe (2611); during the switching process, there is position three, and the first air pipe (264) and the second air pipe (265) are both connected to the negative pressure pipe (2611).

7. The label printing machine according to claim 6, characterized in that: A second cam (2510) is arranged coaxially with the cam (258), and the second cam (2510) cooperates with a control push rod (261) of the reversing adsorption device (26).

8. The label printing machine according to claim 7, characterized in that: The positive pressure chamber (267) is connected to the pressure relief valve (2613).

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