Bag inkjet printing apparatus

Abstract

This application discloses an inkjet printing device for bags, relating to the field of inkjet printing technology. It includes a feeding mechanism, a conveying mechanism, and a printing mechanism. The feeding mechanism provides bags to be printed. The conveying mechanism is located beside the feeding mechanism, with its head receiving the bags from the feeding mechanism. The conveying mechanism includes a frame, which is divided into a conveying area and a clearance area. A conveyor belt structure is provided on the conveying area for transporting the main body of the bag. The clearance area is used to hold the bag's drawstring portion, and a first pressure strip is provided on the clearance area to press down and limit the drawstring portion of the bag. The printing mechanism is located above the conveyor belt structure and is used for inkjet printing on the main body of the bag. This application can improve the printing effect of the bags and extend the service life of the printing equipment.

Description

Technical Field

[0001] This application relates to the field of inkjet printing technology, and in particular to an inkjet printing device for bags. Background Technology

[0002] Shopping bags have become an indispensable part of people's daily lives. After production, the bags usually need to be printed with merchant information or advertisements according to the needs of the merchants or customers, which not only promotes the merchants but also makes the packaging bags more attractive. However, during the printing process, because the bag's drawstring is relatively light, it will sway with the airflow during the printing process. The drawstring can easily overlap with the main body of the bag, snag on a part of the printing equipment, or bend up and touch the print head, potentially damaging it and resulting in the printing effect not meeting the expected requirements. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes an inkjet printing device for bags that can improve the printing effect of bags and the service life of the printing equipment.

[0004] This application provides an inkjet printing apparatus for bags, comprising:

[0005] A feeding mechanism for providing bags to be printed;

[0006] A conveying mechanism is disposed beside the feeding mechanism. The first end of the conveying mechanism is used to receive the bag from the feeding mechanism. The conveying mechanism includes a frame, which is divided into a conveying area and a clearance area. A conveyor belt structure is provided on the conveying area for transporting the main body of the bag. The clearance area is used to place the rope part of the bag. A first pressure strip is provided on the clearance area for pressing down and limiting the rope part of the bag.

[0007] A printing mechanism, located above the conveyor belt structure, is used for inkjet printing on the main body of the bag.

[0008] The bag inkjet printing equipment according to the embodiments of this application has at least the following beneficial effects: the feeding mechanism provides the bag to be printed to the conveying mechanism. When the bag is conveyed on the conveying mechanism, its main body is located on the conveyor belt structure in the frame conveying area. The bag is transported by the conveyor belt structure, and the rope part of the bag falls into the clearance area of ​​the frame. The rope part is pressed down by the first pressure bar in the clearance area, so that the printing mechanism can accurately print the main body. The bag will not float with the air flow during transportation, which can improve the printing effect of the main body of the bag. At the same time, it can also reduce the damage to the equipment caused by the rope part floating, especially the print head of the printing mechanism, and improve the service life of the printing equipment.

[0009] According to some embodiments of this application, the clearance area is further provided with a first guide plate, which is disposed on the front side of the first pressure strip relative to the conveyor belt structure in the transmission direction. The first guide plate is used to guide the rope portion of the bag to move downward.

[0010] According to some embodiments of this application, the feeding mechanism includes a material support plate, a first transfer structure, and a material gripping structure. The material support plate is used to place bags to be printed. The material support plate is provided with a plurality of limiting posts for limiting the position of the bags. The driving end of the first transfer structure is connected to the material gripping structure. The first transfer structure is used to drive the material gripping structure to move between the material support plate and the conveyor belt structure. The material gripping structure is used to grip the bags on the material support plate or place the bags at the beginning of the conveyor belt structure.

[0011] According to some embodiments of this application, the feeding mechanism further includes a vertical transfer structure, the driving end of which is connected to the material support plate, and the vertical transfer structure is used to drive the material support plate to move in the vertical direction.

[0012] According to some embodiments of this application, the conveying mechanism further includes a first flattening structure, which is used to flatten the bag just received by the conveyor belt structure. The first flattening structure includes a first cylinder, a transmission plate, a fixed block, a rotating rod, a rotating plate, and a pressure roller. Two fixed blocks are provided and are respectively arranged on both sides of the frame. The first cylinder is arranged on one side of the frame and is located next to one of the fixed blocks. The two ends of the rotating rod are respectively rotatably connected to the fixed blocks. The driving end of the first cylinder is connected to one end of the transmission plate, and the other end of the transmission plate is connected to one end of the rotating rod on the same side. One end of the rotating plate is sleeved on the rotating rod and is located above the conveyor belt structure. The other end of the rotating plate is provided with a pressure roller.

[0013] According to some embodiments of this application, the conveying mechanism further includes a second guide plate, which is located behind the first flattening structure. The second guide plate is disposed on one side of the frame and on the conveyor belt structure via a first fixing rod. The second guide plate gradually approaches the clearance area along the conveyor belt structure in the direction of transmission.

[0014] According to some embodiments of this application, the conveying mechanism further includes a second flattening structure, which is disposed on the rear side of the second guide plate. The second flattening structure includes an integral flattening section and a circumferential flattening section. The integral flattening section is disposed on the front side of the circumferential flattening section. The integral flattening section is used to flatten the main body of the bag, and the circumferential flattening section is used to continuously flatten the sides of the main body of the bag. The printing mechanism is disposed above the circumferential flattening section.

[0015] According to some embodiments of this application, the second flattening structure includes a second fixed rod and a third fixed rod. The second fixed rod is disposed on the front side of the third fixed rod. The two ends of the second fixed rod and the third fixed rod are respectively disposed on both sides of the frame and located above the conveyor belt structure. The second fixed rod is provided with a plurality of second pressure strips spaced apart in the conveyor belt structure transmission direction. The third fixed rod is provided with a third pressure strip at a position relative to the side of the conveyor belt structure and in the conveyor belt structure transmission direction. The second pressure strip and the third pressure strip do not overlap each other. The length of the third pressure strip is greater than the length of the second pressure strip. The portions of the plurality of second pressure strips and the third pressure strip flush with the second pressure strip form the overall flattening section. The area where the third pressure strip is longer than the second pressure strip forms the circumferential flattening section.

[0016] According to some embodiments of this application, the conveyor belt structure includes a conveyor belt with a plurality of adsorption holes spaced apart on it. The conveying mechanism also includes an adsorption structure disposed inside the conveyor belt, which is used to adsorb the bag onto the conveyor belt through the adsorption holes.

[0017] According to some embodiments of this application, a feeding mechanism is also included. The feeding mechanism is disposed on the side of the conveying mechanism away from the feeding mechanism. The feeding mechanism includes a position sensor, a deceleration buffer wheel, a feeding belt structure, and a receiving plate. The feeding belt structure is connected to the conveyor belt structure. The position sensor is disposed at the intersection of the feeding belt structure and the conveyor belt structure. The deceleration buffer wheel is disposed on the feeding belt structure and located behind the position sensor. The receiving plate is disposed at the end of the feeding belt structure away from the conveyor belt structure. The receiving plate is provided with a clearance groove to facilitate material collection by workers.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0020] Figure 1 This is a schematic diagram of the structure of a bag inkjet printing apparatus provided in some embodiments of this application;

[0021] Figure 2 Top view of a bag inkjet printing apparatus provided in some embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the conveying mechanism provided in some embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the structure of the first flattening structure provided in some embodiments of this application;

[0024] Figure 5 This is a schematic diagram of the conveyor belt structure provided in some embodiments of this application;

[0025] Figure 6 This is a schematic diagram of the structure of the feeding mechanism provided in some embodiments of this application;

[0026] Figure 7 This is a schematic diagram of the feeding mechanism provided in some embodiments of this application.

[0027] The attached icons are numbered as follows:

[0028] Feeding mechanism 100; Material support plate 110; Limiting post 111; First transfer structure 120; Grabbing structure 130; Vertical transfer mechanism 140; Conveying mechanism 200; Frame 210; Clearance area 211; Conveyor belt structure 220; Conveyor belt 221; Adsorption hole 222; First pressure bar 231; First guide plate 232; First flattening structure 240; First cylinder 241; Transmission plate 242; Fixing block 243; Rotating rod 244 Rotating plate 245; pressure roller 246; second guide plate 250; first fixing rod 251; second flattening structure 260; second fixing rod 261; third fixing rod 262; second pressure strip 263; third pressure strip 264; overall flattening section 265; circumferential flattening section 266; adsorption structure 270; feeding mechanism 300; position sensor 310; deceleration buffer wheel 320; feeding belt structure 330; receiving plate 340; clearance groove 341. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0033] In current technology, shopping bags have become an indispensable part of people's daily lives. After the bags are produced, they usually need to be printed with merchant information or advertisements according to the needs of merchants or customers, which not only promotes the merchant but also makes the packaging bags more attractive. However, during the printing process, because the bag's drawstring is relatively light, it will sway with the airflow during the printing process. The drawstring can easily overlap with the main body of the bag, snag on a part of the printing equipment, or bend up and touch the printing nozzle, potentially damaging the print head and resulting in the printing effect not meeting the expected requirements.

[0034] Based on this, this application provides an inkjet printing device for bags to solve the aforementioned technical problems.

[0035] Reference Figure 1 and Figure 2This application provides an inkjet printing device for bags, including: a feeding mechanism 100, a conveying mechanism 200, and a printing mechanism. The feeding mechanism 100 is used to provide bags to be printed. The conveying mechanism 200 is disposed beside the feeding mechanism 100, and the first end of the conveying mechanism 200 is used to receive bags from the feeding mechanism 100. The conveying mechanism 200 includes a frame 210, which is divided into a conveying area and a clearance area 211. A conveyor belt structure 220 is provided on the conveying area for transporting the main body of the bag. The clearance area 211 is used to place the rope part of the bag. A first pressure strip 231 is provided on the clearance area 211 for pressing down the rope part of the bag. The printing mechanism (not shown in the figure) is disposed above the conveyor belt structure 220 and is used for inkjet printing on the main body of the bag. The feeding mechanism 100 provides bags to be printed to the conveying mechanism 200. When the bags are transported on the conveying mechanism 200, their main body is located on the conveyor belt structure 220 in the conveying area of ​​the frame 210. The bags are transported by the conveyor belt structure 220, and the rope part of the bag falls into the clearance area 211 of the frame 210. The first pressure strip 231 of the clearance area 211 presses down the rope part, so that the printing mechanism can accurately print the main body of the bag. The bag will not float with the air flow during transportation, which can improve the printing effect of the main body of the bag and reduce the damage to the equipment caused by the rope part floating, especially the print head of the printing mechanism, thus improving the service life of the printing equipment.

[0036] Reference Figures 1 to 3 It is understood that the clearance area 211 is also provided with a first guide plate 232. The first guide plate 232 is located in front of the first pressure bar 231 in the transmission direction relative to the conveyor belt structure 220. The first guide plate 232 is used to guide the rope portion of the bag to move downward. The bag may include lightweight plastic tote bags and rigid paper tote bags, etc. For lightweight bags, the rope portion can hang naturally in the clearance area 211 until it reaches the position of the first pressure bar 231, where the rope portion is stably pressed downward to play a limiting role. For rigid bags, the rope portion can be guided by the first guide plate 232 in front of the first pressure bar 231, guiding the rope portion of the bag to move downward so that when it reaches the position of the first pressure bar 231, it can be pressed down and limited by the first pressure bar 231, reducing the interference caused by the rope portion during printing.

[0037] Reference Figure 6It is understood that the feeding mechanism 100 includes a material support plate 110, a first transfer structure 120, and a material gripping structure 130. The material support plate 110 is used to place bags to be printed. The material support plate 110 is provided with a number of limiting posts 111 for limiting the position of the bags. The driving end of the first transfer structure 120 is connected to the material gripping structure 130. The first transfer structure 120 is used to drive the material gripping structure 130 to move between the material support plate 110 and the conveyor belt structure 220. The material gripping structure 130 is used to grip the bags on the material support plate 110 or place the bags at the beginning of the conveyor belt structure 220. A plurality of limiting posts 111 on the material support plate 110 form a placement position for the bag to be printed. The first transfer mechanism moves the gripping structure 130 above the material support plate 110, grips a bag to be printed by the gripping structure 130, and after the gripping structure 130 has finished gripping, the first transfer mechanism moves the gripping structure 130 above the conveyor belt structure 220 and places the gripped bag on the conveyor belt structure 220 for transportation. It should be noted that the gripping structure 130 may include a cylinder and a suction cup assembly. The cylinder drives the suction cup assembly to descend so that the suction cup assembly can grip the bag to complete the loading process. This application does not limit the specific design of the gripping structure 130.

[0038] Continue to refer to Figure 6 It is understood that the feeding mechanism 100 also includes a vertical transfer structure. The drive end of the vertical transfer structure is connected to the material support plate 110, and the vertical transfer structure is used to drive the material support plate 110 to move in the vertical direction. The vertical transfer structure can adjust the position of the material support plate 110 in the vertical direction, making it easier for workers to put new bags to be printed on the material support plate 110.

[0039] Reference Figure 3 and Figure 4It is understood that the conveying mechanism 200 also includes a first flattening structure 240, which is used to flatten the bag just received by the conveyor belt structure 220. The first flattening structure 240 includes a first cylinder 241, a transmission plate 242, a fixed block 243, a rotating rod 244, a rotating plate 245, and a pressure roller 246. There are two fixed blocks 243, which are respectively set on both sides of the frame 210. The first cylinder 241 is set on one side of the frame 210 and is located next to one of the fixed blocks 243. The two ends of the rotating rod 244 are rotatably connected to the fixed blocks 243. The driving end of the first cylinder 241 is connected to one end of the transmission plate 242. The other end of the transmission plate 242 is connected to one end of the rotating rod 244 on the same side. One end of the rotating plate 245 is sleeved on the rotating rod 244 and is located above the conveyor belt structure 220. The other end of the rotating plate 245 is provided with a pressure roller 246. When the material gripping structure 130 transports the bag to be printed to the conveyor belt structure 220, it mainly grips the upper surface of the main body of the bag. The lower surface of the bag will sag due to gravity, resulting in the bag being slightly open. That is, the height of the bag when it first enters the conveyor belt structure 220 will be higher than its height on the material support plate 110. If the bag is too high, it is easy to collide with the subsequent printing mechanism, thereby causing damage to the printing mechanism. The first flattening structure 240 is used to flatten the bag that the conveyor belt structure 220 has just received, so as to close the bag again, which improves the printing effect of the bag and protects the printing mechanism. Specifically, before the gripping structure 130 places the bag onto the conveyor belt structure 220, the first cylinder 241 retracts its drive end and, through the force transmission of the transmission plate 242, transmission rod, and rotating plate 245, lifts the pressure roller 246. After the gripping structure 130 places the bag onto the conveyor belt structure 220, the first cylinder 241 extends its drive end and, through the force transmission of the transmission plate 242, transmission rod, and rotating plate 245, presses down the pressure roller 246 to flatten and close the bag that has just entered the conveyor belt structure 220, thereby improving the printing effect of subsequent inkjet printing.

[0040] Reference Figures 1 to 3 It is understood that the conveying mechanism 200 also includes a second guide plate 250, which is located behind the first flattening structure 240. The second guide plate 250 is mounted on one side of the frame 210 and on the conveyor belt structure 220 via a first fixing rod 251. The second guide plate 250 gradually approaches the clearance area 211 along the conveyor belt structure 220. The second guide plate 250 guides the position of the bag as it enters the conveyor belt structure 220, allowing the bag's rope portion to fall into the clearance area 211, thus preventing the rope portion from interfering with the main body of the bag during printing.

[0041] Reference Figure 2It is understood that the conveying mechanism 200 also includes a second flattening structure 260, which is located behind the second guide plate 250. The second flattening structure 260 includes a general flattening section 265 and a circumferential flattening section 266. The general flattening section 265 is located in front of the circumferential flattening section 266 and is used to flatten the main body of the bag. The circumferential flattening section 266 is used to continuously flatten the sides of the main body of the bag. The printing mechanism is located above the circumferential flattening section 266. The general flattening section 265 of the second flattening structure 260 performs secondary flattening on the main body of the bag to prevent the bag from being too high and damaging the print head of the printing mechanism. The main body of the bag is inkjet printed at the position of the circumferential flattening section 266. During the printing process, the circumferential flattening section 266 presses down on the sides of the main body of the bag to prevent the bag from shaking and reduce the inkjet printing effect, thereby improving the stability of the printing process.

[0042] Reference Figure 3 It is understood that the second flattening structure 260 includes a second fixing rod 261 and a third fixing rod 262. The second fixing rod 261 is located in front of the third fixing rod 262. The two ends of the second fixing rod 261 and the third fixing rod 262 are respectively located on both sides of the frame 210 and above the conveyor belt structure 220. The second fixing rod 261 is provided with a number of second pressure strips 263 at intervals in the transmission direction of the conveyor belt structure 220. The third fixing rod 262 is provided with a third pressure strip 264 at a position relative to the side of the conveyor belt structure 220 and in the transmission direction of the conveyor belt structure 220. The second pressure strips 263 and the third pressure strips 264 do not overlap each other. The length of the third pressure strip 264 is greater than the length of the second pressure strip 263. The portion of the several second pressure strips 263 and the third pressure strip 264 that is flush with the second pressure strip 263 forms an integral flattening section 265. The area of ​​the third pressure strip 264 that is longer than the second pressure strip 263 forms a circumferential flattening section 266. For bags of different sizes, the operator can adjust the position of the second pressure strip 263 on the second fixing rod 261 and the position of the third pressure strip 264 on the third fixing rod 262 as appropriate; this application does not limit this adjustment. The portion of the bag's main body flush with the second pressure strip 263 allows for overall flattening. After passing through the flattening section 265, since the length of the third pressure strip 264 is longer than the length of the second pressure strip 263, the sides of the bag are also fixed by the third pressure strip 264. Simultaneously, the printing mechanism is located behind the second pressure strip 263, above the hollowed-out position between the third pressure strip 264 and the other second pressure strips 263. The side positioning of the third pressure strip 264 prevents the bag from shaking, thus reducing inkjet printing effect and improving the stability of the printing process.

[0043] Reference Figure 5It is understood that the conveyor belt structure 220 includes a conveyor belt 221 with multiple suction holes 222 spaced apart. The conveying mechanism 200 also includes a suction structure 270 disposed within the conveyor belt 221. The suction structure 270 is used to adsorb bags onto the conveyor belt 221 through the suction holes 222. Because the bags are lightweight, they are prone to falling during transport on the conveyor belt structure 220. The suction structure 270 draws air from the conveyor belt 221 and adsorbs the bags onto it through the suction holes 222, ensuring the bags adhere tightly to the conveyor belt 221 and resulting in smoother and more efficient equipment operation.

[0044] Reference Figure 7 It is understood that the bag inkjet printing equipment provided in this application also includes a feeding mechanism 300. The feeding mechanism 300 is located on the side of the conveying mechanism 200 away from the feeding mechanism 100. The feeding mechanism 300 includes a position sensor 310, a deceleration buffer wheel 320, a feeding belt structure 330, and a receiving plate 340. The feeding belt structure 330 is connected to the conveyor belt structure 220. The position sensor 310 is located at the junction of the feeding belt structure 330 and the conveyor belt structure 220. The deceleration buffer wheel 320 is located on the feeding belt structure 330 and is located behind the position sensor 310. The receiving plate 340 is located at the end of the feeding belt structure 330 away from the conveyor belt structure 220. The receiving plate 340 is provided with a clearance groove 341 to facilitate the collection of materials by the staff. The positioning sensor 310 is located between the conveyor belt structure 220 and the unloading belt structure 330. It is used to sense the bags output from the conveyor belt structure 220 and count them. The deceleration buffer wheel 320 is used to slow down the transmission speed of the bags output from the conveyor belt structure 220. The printed bags are stacked sequentially on the receiving plate 340 along with the unloading belt structure 330. When the number of bags stacked on the receiving plate 340 reaches a certain number, the worker can reach into the clearance groove 341 of the receiving plate 340 and lift all the bags from the bottom to complete the receiving process.

[0045] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A bag inkjet printing apparatus characterized by comprising: The utility model relates to a kind of bag printing machine, including: The upper mechanism is used to provide bag to be printed; The conveying mechanism is arranged in the side of the upper mechanism, the first end of the conveying mechanism is used to receive the bag from the upper mechanism, the conveying mechanism includes rack, the conveying area and the empty area are divided in the rack, the conveying belt structure is equipped on the conveying area, the conveying belt structure is used to transport the main part of the bag, the empty area is used to place the rope part of the bag, the first pressing strip is equipped on the empty area, and the first pressing strip is used to press the rope part of the bag and limit;The first guide plate is further provided on the empty area, and the first guide plate is arranged on the front side of the first pressing strip relative to the conveying direction of the conveying belt structure, and the first guide plate is used to guide the rope part of the bag to move downwards; The printing mechanism is arranged above the conveying belt structure, and is used for ink-jet printing of the main part of the bag.

2. The bag inkjet printing apparatus according to claim 1, characterized by, The upper mechanism includes material supporting plate, first moving structure and grabbing structure, the material supporting plate is used to place bag to be printed, the material supporting plate is provided with a plurality of limiting columns for limiting the position of the bag, the driving end of the first moving structure is connected with the grabbing structure, the first moving structure is used to drive the grabbing structure to move between the material supporting plate and the conveying belt structure, and the grabbing structure is used to grab the bag on the material supporting plate or place the bag at the first end of the conveying belt structure.

3. The bag inkjet printing apparatus according to claim 2, characterized by, The upper mechanism further includes vertical moving structure, the driving end of the vertical moving structure is connected with the material supporting plate, and the vertical moving structure is used to drive the material supporting plate to move in the vertical direction.

4. The bag inkjet printing apparatus according to claim 1, characterized by, The conveying mechanism further includes first flattening structure, and the first flattening structure is used to flatten the bag received by the conveying belt structure, the first flattening structure includes first cylinder, transmission plate, fixed block, rotating rod, rotating plate and pressure roller, the fixed block is provided with two and is arranged on the two sides of the rack respectively, the first cylinder is arranged on one side of the rack and located on the side of one of the fixed blocks, the two ends of the rotating rod are rotatably connected to the fixed blocks respectively, the driving end of the first cylinder is connected with one end of the transmission plate, the other end of the transmission plate is connected with one end of the rotating rod on the same side, one end of the rotating plate is sleeved on the rotating rod and located above the conveying belt structure, and the other end of the rotating plate is provided with a pressure roller.

5. The bag inkjet printing apparatus according to claim 4, characterized by, The conveying mechanism further includes second guide plate, and the second guide plate is located on the rear side of the first flattening structure, the second guide plate is arranged on one side of the rack through first fixed rod and located on the conveying belt structure, and the second guide plate gradually approaches the empty area along the conveying direction of the conveying belt structure.

6. The bag inkjet printing apparatus according to claim 5, characterized by The conveying mechanism further comprises a second flattening structure arranged at the rear side of the second guide plate, the second flattening structure comprises an integral flattening section and a circumferential flattening section, the integral flattening section is arranged at the front side of the circumferential flattening section, the integral flattening section is used for flattening the main body of the bag, and the circumferential flattening section is used for continuously flattening the side edges of the main body of the bag, and the printing mechanism is arranged above the circumferential flattening section.

7. The bag inkjet printing apparatus according to claim 6, characterized by The second flattening structure comprises a second fixed rod and a third fixed rod, the second fixed rod is arranged at the front side of the third fixed rod, the two ends of the second fixed rod and the third fixed rod are arranged at the two sides of the rack and above the conveying belt structure, a plurality of second pressing strips are arranged on the second fixed rod in the transmission direction of the conveying belt structure, a third pressing strip is arranged on the third fixed rod at the position relative to the side edge of the conveying belt structure and in the transmission direction of the conveying belt structure, the second pressing strips and the third pressing strip do not overlap with each other, the length of the third pressing strip is greater than that of the second pressing strip, the second pressing strips and the part of the third pressing strip flush with the second pressing strips form the integral flattening section, and the area of the third pressing strip longer than the second pressing strip forms the circumferential flattening section.

8. The bag inkjet printing apparatus according to claim 1, characterized by, The conveying belt structure comprises a conveying belt, a plurality of suction holes are arranged on the conveying belt in a spaced manner, and the conveying mechanism further comprises a suction structure arranged in the conveying belt, the suction structure is used for suctioning the bag to the conveying belt through the suction holes.

9. The bag inkjet printing apparatus according to claim 1, characterized by, Further comprising a discharging mechanism arranged at the side of the conveying mechanism away from the feeding mechanism, the discharging mechanism comprises a position sensor, a deceleration buffer wheel, a discharging belt structure and a material collecting plate, the discharging belt structure is connected with the conveying belt structure, the position sensor is arranged at the position where the discharging belt structure and the conveying belt structure are connected, the deceleration buffer wheel is arranged on the discharging belt structure and at the rear side of the position sensor, and the material collecting plate is arranged at one end of the discharging belt structure away from the conveying belt structure, and the material collecting plate is provided with an avoiding groove facilitating the staff to collect materials.

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