Printing device

Abstract

The invention relates to the technical field of printing equipment, and particularly discloses a printing device which comprises a machine body, the machine body is provided with a printing device and a feeding device, the feeding device comprises a conveying belt, air inlet holes are evenly formed in the conveying belt, the machine body is further provided with a positioning mechanism and an adsorption mechanism, and the positioning mechanism is arranged at the feeding end of the machine body; the positioning mechanism comprises a positioning plate and a driving assembly, the adsorption mechanism comprises an adsorption frame, a plurality of partition plates, a movable partition plate and a negative pressure assembly, the negative pressure assembly is arranged in the adsorption frame, the partition plates are arranged in the adsorption frame at intervals in the length direction of the machine body, the adsorption frame is divided into a plurality of cavities through the partition plates, and the movable partition plate is arranged in the adsorption frame. The movable partition plate moves in the width direction of the machine body, the movable partition plate and the positioning plate are opposite in the longitudinal direction, the side walls of the adsorption frame, the upper end faces of the movable partition plate and the upper end faces of the partition plates are attached to the conveying belt, and the printing quality of paperboards is improved through the printing device.

Description

Technical Field

[0001] The present invention relates to the technical field of printing equipment, and particularly relates to a printing device. Background Art

[0002] Cardboard printers are mainly used to print information such as text, patterns, barcodes, etc. on packaging materials such as cardboard and cartons. They are one of the most commonly used printing equipment. During the production process of packaging cartons, it is necessary to first use a printer to print patterns on the cardboard. When using a printer to print cardboard, first place the cardboard on one side of the printing press, and then the conveyor belt transports the cardboard to the printing device one by one, so as to achieve the printing of the cardboard. In order to achieve stable feeding of the cardboard, most printers in the related art use a negative pressure adsorption method for feeding, and the cardboard fits with the conveyor belt under the action of negative pressure.

[0003] The patent document with the publication number CN217753249U discloses a printer with a material positioning structure, including a printer body, a frame, a transmission system, a print head, a top plate, an adsorption area, and a vacuum adsorption table. A frame is provided on the printer body, a transmission system is provided on the upper part of the frame, and the transmission system is connected to the frame in a fixed manner. A print head is provided on the transmission system, a top plate is provided on the top of the frame, and the top plate is connected to the frame in a fixed manner. An adsorption area is provided in the middle of the top plate, and the adsorption area is composed of multiple vacuum adsorption tables. When the printer provided by this patent document is in use, the material to be printed is placed in the adsorption area, and two sides of the printed material are aligned with two sides of the top plate for positioning, and then the printed material is fixed through the adsorption area for printing.

[0004] For the printer provided by the above patent document, the printed material is positioned by the top plate, that is, two sides of the printed material are aligned with two sides of the top plate. To ensure the stability of the printed material during transportation, it is necessary to make the printed material cover the adsorption area. Since the sizes of the cardboard for different specifications of packaging cartons are different, when the width of the cardboard is smaller than the adsorption area, if the cardboard cannot completely cover the adsorption area, air is likely to leak from the gaps at the edges of the adsorption area, reducing the negative pressure of the adsorption area and affecting the fixing effect of the cardboard. Especially during the printing process, the cardboard may be affected by factors such as the movement of the print head and the self-weight of the paper, resulting in the deviation of its position, and further affecting the printing quality. Summary of the Invention

[0005] The present invention provides a printing device, aiming to solve the problem that when the printer in the related art transports cardboard with a width different from that of its adsorption area, air is likely to leak from the edges of the adsorption area, resulting in the deviation of the cardboard position and ultimately affecting the printing quality of the cardboard.

[0006] A printing device of the present invention includes a machine body, a printing device and a feeding device are provided on the machine body. The feeding device includes a conveyor belt, and air inlet holes are uniformly arranged on the conveyor belt. The machine body is further provided with: A positioning mechanism is provided at the loading end of the machine body. The positioning mechanism includes a positioning plate and a driving assembly, and the driving assembly drives the positioning plate to move along the width direction of the machine body. An adsorption mechanism includes an adsorption frame, partition plates, a movable partition plate, and a negative pressure assembly. The negative pressure assembly is arranged inside the adsorption frame and is used to extract the air inside the adsorption frame. There are multiple partition plates, and the partition plates are arranged at intervals along the length direction of the machine body inside the adsorption frame. The adsorption frame is divided into multiple chambers by each partition plate. The negative pressure assembly is communicated with each independent chamber. The movable partition plate is arranged inside the adsorption frame and moves along the width direction of the machine body. The movable partition plate is opposite to the positioning plate longitudinally. The upper end surfaces of the side walls, the movable partition plate, and each partition plate of the adsorption frame are attached to the conveyor belt.

[0007] Optionally, there are two positioning plates, and the two positioning plates are connected by a connection structure. The connection structure includes a connecting rod and a connecting piece. There are two connecting rods, and the upper ends of the two connecting rods are respectively hinged to the upper ends of the two positioning plates. A slider is longitudinally slidably arranged on the connecting piece, and the lower ends of the two connecting rods are respectively slidably connected to the slider. An elastic member is arranged on the upper side of the slider, and the elastic member presses the slider downward. A stop block is also arranged on the machine body, and the stop block is in movable contact with the connecting piece. When the stop block contacts the connecting piece, it blocks the movement of the connecting piece. The stop block is connected to a cylinder, and the cylinder drives the stop block to move along the width direction of the machine body to change the position where the stop block abuts against the connecting piece. There are two movable partition plates, and the two movable partition plates are respectively opposite to the two positioning plates longitudinally.

[0008] Optionally, two limit blocks are arranged inside the adsorption frame, and the two limit blocks are respectively connected to the two positioning plates. The two limit blocks move synchronously with the two positioning plates respectively. The two movable partition plates are located between the two limit blocks, and the movable partition plate stops moving when it abuts against the limit block. Optionally, the traction assembly includes a rotating cylinder and a traction rope. The rotating cylinder is rotatably installed on the machine body through a torsion spring. One end of the traction rope is connected to the rotating cylinder, and the other end of the traction rope is connected to the movable partition plate.

[0009] Optionally, the positioning plate is connected to the limit block through a connecting strip. The connecting strip is a frame shape with one end open. The open end of the connecting strip faces the positioning plate. The free end of the upper side frame of the connecting strip is fixed to the positioning plate. The lower side frame of the connecting strip extends into the adsorption frame from the side of the machine body and is connected to the limit block inside the adsorption frame.

[0010] Optionally, there are multiple groups of traction assemblies, and any movable partition plate is connected to at least two groups of traction assemblies.

[0011] Optionally, the driving assembly includes a driving source and a lead screw. The driving source is installed on the machine body. The lead screw is arranged above the feeding end of the machine body and extends along the width direction of the machine body. The driving end of the driving source is connected to one end of the lead screw. Any positioning plate is threadedly connected to the lead screw, and the other positioning plate is slidably sleeved on the lead screw.

[0012] Optionally, a longitudinal baffle is provided at the feeding end of the machine body. The connecting member slides in contact with the baffle, and the air cylinder is installed on the baffle.

[0013] Optionally, the negative pressure assembly includes a negative pressure pipe, a connecting pipe, and a pumping device. There are multiple negative pressure pipes, and the negative pressure pipes are arranged at intervals along the length direction of the adsorption frame. Multiple air extraction ports are provided at the upper end of the negative pressure pipe. The connecting pipe is connected to each negative pressure pipe, and the pumping device is connected to the connecting pipe.

[0014] Optionally, a plurality of grooves are provided on the movable partition plate. The number of grooves is the same as the number of partition plates. Each partition plate is slidably engaged with each groove, and the partition plate is slidably attached to the side wall of the groove.

[0015] The beneficial effects of the present invention are as follows: (1) The printing effect on the printing substrate is improved. The positioning mechanism cooperates with the movable partition plate in the adsorption mechanism, and the width of the relative adsorption area below the conveyor belt can be adjusted according to the width of different printing substrates, so that the width of the adsorption area is the same as the width of the printing substrate, avoiding the unstable adsorption of the printing substrate caused by air leakage at the edge of the adsorption area during the transportation of the printing substrate, reducing the probability of the printing substrate shifting during the printing process, ensuring the printing effect of the pattern, and thus improving the final processing quality of the product.

[0016] (2) The printing efficiency of the printing substrate is improved. When the width of the printing substrate is small, the positions of the two positioning plates and the two movable partition plates can be adjusted to form two adsorption areas below the conveyor belt. The two adsorption areas correspond to two groups of positioning plates with different widths respectively, so as to realize the simultaneous transportation of two groups of printing substrates to the printing device and the simultaneous printing of the two groups of printing substrates, effectively improving the printing efficiency. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 is a schematic diagram of the installation structure of the positioning mechanism and the adsorption mechanism relative to the machine body in the present invention.

[0019] Figure 3 is a schematic diagram of the cooperation between the positioning mechanism and the adsorption mechanism in the present invention.

[0020] Figure 4 is a schematic diagram of the connection structure between the two positioning plates and the machine body in the separated state in the second embodiment.

[0021] Figure 5 It is a schematic structural diagram of the connection between the two positioning plates and the connection structure and the moving partition when they are far away from each other in the second embodiment.

[0022] Figure 6 It is a schematic structural diagram of the connection between the positioning plate and the connection structure in the second embodiment.

[0023] Figure 7 It is a schematic structural diagram of the negative pressure assembly in the present invention.

[0024] Reference numerals: 1, body; 11, printing device; 12, baffle; 13, conveyor belt; 2, positioning plate; 21, drive source; 22, lead screw; 23, connecting bar; 231, limiting block; 24, connecting piece; 241, slider; 242, chute; 25, connecting rod; 26, elastic member; 3, adsorption frame; 31, partition plate; 32, moving partition; 321, groove; 33, negative pressure pipe; 331, air extraction port; 34, connecting pipe; 35, rotating cylinder; 36, towing rope; 4, stop block; 41, cylinder. Detailed implementation manners

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0026] Embodiment 1: As Figures 1 to 3 shown, a printing device of the present invention includes a body 1. A printing device 11 and a feeding device are provided on the body 1. The feeding device conveys the printing substrate from the loading end of the body 1 to the unloading end of the body 1. The feeding device can convey the printing substrate in a manner of belt transmission by a conveyor belt 13. Specifically, driving rollers can be rotatably provided at the loading end and the unloading end of the body 1 respectively. One of the driving rollers is connected to a motor, and the conveyor belt 13 is sleeved on the two driving rollers. The printing device 11 is provided above the conveyor belt 13. After the printing substrate is placed on the conveyor belt 13, it can move along with the conveyor belt 13. The printing substrate passes under the printing device 11, and the printing device 11 prints the printing substrate passing through its printing range. A positioning mechanism and an adsorption mechanism are also provided on the body 1. The positioning mechanism is provided at the loading end of the body 1 and is used to position the printing substrate at the loading position at the loading end of the body 1. The adsorption mechanism is located in the cavity formed by the conveyor belt 13. The adsorption mechanism forms a negative pressure environment under the conveyor belt 13 so that the printing substrate can be stably conveyed while being attached to the conveyor belt 13 during the conveying process.

[0027] When manufacturing a packaging box, it is first necessary to cut out cardboard of a certain size. The printing device provided by the present invention is mainly used for printing patterns on the cardboard for making the packaging box. The printing substrate in the present invention refers to the cardboard. In other embodiments, the printing device provided by the present invention can also be used for printing other similar products. Since the sizes of the cardboard for making different packaging boxes vary, when the width of the cardboard is smaller than the adsorption area, the cardboard cannot completely cover the adsorption area, and air is likely to leak from the gaps at the edges of the adsorption area, reducing the negative pressure in the adsorption area, thereby affecting the adsorption strength of the cardboard and causing the cardboard to shift during the printing process, resulting in the offset of the patterns printed on the cardboard and affecting the final quality of the packaging box. In the present invention, to ensure the stability of the cardboard conveyance, the adsorption range of the adsorption mechanism can be adjusted along with the positioning mechanism to ensure that the width of the adsorption area formed by the adsorption mechanism is consistent with the width of the cardboard, thereby ensuring the stable conveyance of the cardboard.

[0028] The positioning mechanism includes a positioning plate 2 and a driving assembly. The driving assembly is used to drive the positioning plate 2 to move along the width direction of the machine body 1. Baffles 12 are also provided on both width sides of the feeding end of the machine body 1. The two baffles 12 are arranged parallel to the positioning plate 2 in the vertical direction. When printing the cardboard, the staff places the neatly stacked cardboard on the feeding end of the machine body 1 and makes one side of the cardboard abut against one of the baffles 12. Then, the driving assembly drives the positioning plate 2 to move until the positioning plate 2 abuts against the cardboard, that is, the cardboard is stacked between the positioning plate 2 and the baffle 12, and the positioning plate 2 is moved into contact with the cardboard to achieve the preliminary positioning of the cardboard at the feeding end. The driving assembly includes a driving source 21 and a lead screw 22. The driving source 21 is fixedly installed on the machine body 1. The driving source 21 directly uses a motor. The driving end of the driving source 21 is fixedly connected to the lead screw 22. The driving source 21 is used to drive the lead screw 22 to rotate. The positioning plate 2 is threadedly connected to the lead screw 22. When the lead screw 22 rotates, it drives the positioning plate 2 to move along the length direction of the lead screw 22.

[0029] The adsorption mechanism includes an adsorption frame 3, partition plates 31, a movable partition plate 32, and a negative pressure assembly. The adsorption frame 3 is set as a rectangular frame structure and is arranged in the cavity of the conveyor belt 13. The upper end faces of the side walls of the adsorption frame 3 are attached to the conveyor belt 13. There are multiple partition plates 31, and each partition plate 31 is arranged at intervals and evenly along the length direction of the machine body 1 within the adsorption frame 3 to divide the internal space of the adsorption frame 3 in the length direction of the machine body 1 to form multiple chambers. When the negative pressure assembly works, it extracts the gas in each independent chamber to create a negative pressure environment in each chamber. The movable partition plate 32 is slidably arranged in the adsorption frame 3 and moves along the width direction of the machine body 1. There are multiple grooves 321 on the movable partition plate 32, and the number of grooves 321 is the same as the number of partition plates 31. Each partition plate 31 is slidably matched with each groove 321, and the side walls of the partition plate 31 are slidably attached to the side walls of the grooves 321. The movable partition plate 32 is opposite to the positioning plate 2 longitudinally. The movable partition plate 32 can divide the adsorption area in the adsorption frame 3 to form an adsorption area with the same width as the cardboard, so that during the cardboard printing process, the cardboard completely covers this adsorption area to ensure the stability of the cardboard transportation.

[0030] In this embodiment, to achieve the synchronous movement of the movable partition plate 32 and the positioning plate 2, a "U"-shaped positioning block can be arranged in the adsorption frame 3. The positioning plate 2 drives the positioning block to move synchronously, and the end of the movable partition plate 32 is stuck in the positioning block. The positioning plate 2 is connected to the limiting block 231 through a connecting strip 23. The connecting strip 23 is a frame-shaped structure with one end open, and the open end of the connecting strip 23 faces the positioning plate 2. The free end of the upper side frame of the connecting strip 23 is connected to the positioning plate 2, and the lower side frame of the connecting strip 23 extends into the adsorption frame 3 from the side of the machine body 1 and is connected to the positioning block in the adsorption frame 3. By setting the connecting strip 23, the relative fixation of the positioning plate 2 and the positioning block can be achieved. The connecting strip 23 extends into the adsorption frame 3 from the side of the machine body 1 to avoid the conveyor belt 13 and prevent interference with the transportation of the conveyor belt 13 due to direct longitudinal connection. When the positioning plate 2 moves, it drives the positioning block to move synchronously through the connecting strip 23, and then drives the movable partition plate 32 connected to the positioning block to move synchronously. When the movable partition plate 32 moves, it can change the width of the adsorption area in the adsorption frame 3 relative to the cardboard to be the same as the width of the cardboard.

[0031] As Figure 7 shown, the negative pressure assembly includes a negative pressure pipe 33, a connecting pipe 34, and a pumping device. There are multiple negative pressure pipes 33, and each negative pressure pipe 33 is arranged at intervals along the length direction of the adsorption frame 3. Multiple air extraction ports 331 are provided at the upper end of the negative pressure pipe 33. The connecting pipe 34 is fixedly connected to each negative pressure pipe 33, and the pumping device is connected to the connecting pipe 34. Air extraction ports 331 are provided in each chamber formed by the partition plates 31 in the adsorption frame 3.

[0032] Embodiment 2: As Figures 1 to 6As shown, when the width of the cardboard is less than half of the width of the conveyor belt 13, the conveyor belt 13 can convey two cardboards simultaneously in its width direction to improve the printing efficiency of the cardboards.

[0033] In this embodiment, there are two positioning plates 2 and two moving partition plates 32. When conveying two smaller cardboards simultaneously, the two positioning plates 2 move relatively away from each other. Two areas for stacking cardboards are formed between the two positioning plates 2 and the two baffles 12 respectively. After the two positioning plates 2 are separated, they are attached to the two stacks of cardboards. When the two positioning plates 2 position the two groups of cardboards respectively, it is necessary to move the two positioning plates 2 relatively away from each other and contact the two groups of cardboards respectively. Therefore, in this embodiment, only one positioning plate 2 is threadedly connected to the lead screw 22, and a through hole is provided on the other positioning plate 2, and it is movably sleeved on the lead screw 22 through the through hole. The two positioning plates 2 are connected by a connection structure. The connection structure includes a connecting rod 25 and a connecting member 24. There are two connecting rods 25. The upper ends of the two connecting rods 25 are respectively hinged to the upper ends of the two positioning plates 2. A slider 241 is provided on the connecting member 24. The slider 241 is longitudinally slidably connected to the connecting member 24. A longitudinal chute 242 is provided on the connecting member 24. The slider 241 is longitudinally slidably connected to the connecting member 24 through the chute 242. The lower ends of the two connecting rods 25 are both hinged to the slider 241. The slider 241 is also connected to the connecting member 24 through an elastic member 26. The elastic member 26 directly adopts a spring. The elastic member 26 is arranged on the upper side of the slider 241. The elastic member 26 presses the slider 241 downward. When the slider 241 is at the lowermost end of the chute 242, the two positioning plates 2 are attached to each other, and the two positioning plates 2 remain attached and move synchronously. A stop block 4 is also provided on the machine body 1. The stop block 4 is connected to a cylinder 41. The extending end of the cylinder 41 is fixedly connected to the stop block 4. The cylinder 41 pushes the stop block 4 to move along the width direction of the machine body 1. When the two positioning plates 2 move together, they will also drive the connecting member 24 to move synchronously. When the connecting member 24 moves to contact the stop block 4, the stop block 4 blocks the movement of the connecting member 24. If the positioning plate 2 threadedly engaged with the lead screw 22 continues to move, the distance between the positioning block and the connecting member 24 increases, and the slider 241 is pushed upward through the connecting rod 25 connected thereto. Since the other connecting rod 25 is also hinged to the slider 241, when the slider 241 moves upward, the positioning plate 2 slidably engaged with the lead screw 22 is pushed to move through the connecting rod 25, and the two positioning plates 2 move in opposite directions. In this embodiment, the two moving partition plates 32 are respectively longitudinally opposite to the two positioning plates 2 to simultaneously form adsorption areas opposite to the two groups of cardboards below the conveyor belt 13.

[0034] In this embodiment, two positioning plates 2 are respectively connected with limiting blocks 231 through connecting bars 23. The two limiting blocks 231 are movably arranged in the adsorption frame 3. The two limiting blocks 231 move synchronously with the two positioning plates 2 respectively. Two moving partitions 32 are located between the two limiting blocks 231. A traction assembly is further provided on the machine body 1. The traction assembly is used to drive the two moving partitions 32 to move with the corresponding positioning plates 2. The traction assembly includes a rotating cylinder 35 and a traction rope 36. One end of the traction rope 36 is connected to the moving partition 32, and the other end of the traction rope 36 is wound on the rotating cylinder 35. An installation bracket is provided on the machine body 1. The rotating cylinder 35 is rotatably connected to the installation bracket through a torsion spring. When the moving partition 32 pulls the traction rope 36 away from the rotating cylinder 35, it drives the rotating cylinder 35 to rotate and makes the torsion spring store energy. After the two positioning plates 2 move relatively away from each other, the moving partition 32 moves in the direction close to the rotating cylinder 35 under the elastic force of the torsion spring, and stops moving after the moving partition 32 abuts against the limiting block 231. That is, after the two positioning plates 2 move away from each other, the two moving partitions 32 also move in the opposite direction until they are again in a position relative to the two positioning plates 2.

[0035] In this embodiment, when conveying a single cardboard with a larger width, the air cylinder 41 drives the stopper 4 to move, so that the stopper 4 is disengaged from the blocking of the connecting member 24. The elastic member 26 pushes the slider 241 to move downward, driving the positioning plate 2 movably connected to the lead screw 22 to move until the two positioning plates 2 are in contact with each other. The two limiting blocks 231 connected to the two positioning plates 2 approach each other and push the two moving partitions 32 to approach until they are in a state of being in contact with each other.

[0036] By adjusting the position of the stopper 4 through the air cylinder 41, the position where the two positioning plates 2 move relatively away from each other can also be adjusted, so as to adjust the positioning area to adapt to cardboard with different widths when conveying two groups of cardboard with different widths at the same time.

[0037] The printing device provided by the present invention can adapt to the width of the printing substrate, form an adsorption area consistent with the width of the printing substrate under the lower side of the conveyor belt 13, so as to ensure the adsorption strength of the printing substrate, reduce the offset of the printing substrate during the printing process, ensure the printing quality, and at the same time can flexibly adjust the number of printing substrates conveyed at one time in the width direction of the conveyor belt 13 according to the size of the printing substrate. So when the width of the printing substrate is small, two groups of different printing substrates can be printed at the same time to improve the printing efficiency.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as a limitation on the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A printing device, comprising a machine body (1), wherein a printing device (11) and a feeding device are arranged on the machine body (1), wherein the feeding device comprises a conveyor belt (13), and air inlet holes are evenly arranged on the conveyor belt (13), wherein: The machine body (1) is also provided with: A positioning mechanism, the positioning mechanism being arranged at a feeding end of the machine body (1), the positioning mechanism comprising a positioning plate (2) and a driving component, the driving component driving the positioning plate (2) to move along the width direction of the machine body (1); The adsorption mechanism comprises an adsorption frame (3), a partition plate (31), a movable partition plate (32) and a negative pressure component. The negative pressure component is arranged in the adsorption frame (3) and is used to extract air in the adsorption frame (3). There are a plurality of partition plates (31). The partition plates (31) are arranged at intervals in the adsorption frame (3) along the length direction of the machine body (1). The adsorption frame (3) is divided into a plurality of chambers by the partition plates (31). The negative pressure component is connected to each independent chamber. The movable partition plate (32) is arranged in the adsorption frame (3). The movable partition plate (32) moves along the width direction of the machine body (1). The movable partition plate (32) and the positioning plate (2) are opposite to each other in the longitudinal direction. The upper end surfaces of the side walls of the adsorption frame (3), the movable partition plates (32) and the partition plates (31) are in contact with the conveyor belt (13).

2. A printing device according to claim 1, characterized in that: There are two positioning plates (2), and the two positioning plates (2) are connected by a connecting structure. The connecting structure includes a connecting rod (25) and a connecting member (24). There are two connecting rods (25), and the upper ends of the two connecting rods (25) are respectively hinged to the upper ends of the two positioning plates (2). A slider (241) is provided on the connecting member (24) for longitudinal sliding. The lower ends of the two connecting rods (25) are respectively slidably connected to the slider (241). An elastic member (26) is provided on the upper side of the slider (241), and the elastic member (26) presses the slider (241) downward. The machine body (1) is further provided with a stopper (4), the stopper (4) being in active contact with the connecting member (24), and when the stopper (4) is in contact with the connecting member (24), the connecting member (24) is blocked from moving, and the stopper (4) is connected to a cylinder (41), and the cylinder (41) drives the stopper (4) to move along the width direction of the machine body (1) so as to change the position of the stopper (4) abutting against the connecting member (24); There are two movable partitions (32), and the two movable partitions (32) are respectively opposite to the two positioning plates (2) in the longitudinal direction.

3. A printing device according to claim 2, characterized in that: Two limit blocks (231) are arranged in the adsorption frame (3), the two limit blocks (231) are connected to the two positioning plates (2) respectively, the two limit blocks (231) move synchronously with the two positioning plates (2) respectively, the two movable partitions (32) are located between the two limit blocks (231), and the movable partitions (32) stop moving when they collide with the limit blocks (231); The two movable partitions (32) are respectively connected to a traction assembly, which comprises a rotating drum (35) and a traction rope (36). The rotating drum (35) is rotatably mounted on the machine body (1) via a torsion spring, one end of the traction rope (36) is connected to the rotating drum (35), and the other end of the traction rope (36) is connected to the movable partition (32).

4. A printing device according to claim 3, characterized in that: The positioning plate (2) is connected to the limiting block (231) via a connecting strip (23); the connecting strip (23) is in the shape of a frame with one end open, the open end of the connecting strip (23) faces the positioning plate (2); the free end of the upper side frame of the connecting strip (23) is fixed to the positioning plate (2); the lower side frame of the connecting strip (23) extends from the side of the body (1) into the adsorption frame (3) and is connected to the limiting block (231) in the adsorption frame (3).

5. A printing device according to claim 3, characterized in that: There are multiple groups of traction components, and any movable partition (32) is connected to at least two groups of traction components.

6. A printing device according to claim 2, characterized in that: The drive assembly comprises a drive source (21) and a screw rod (22), wherein the drive source (21) is mounted on the machine body (1), the screw rod (22) is arranged on the upper side of the feeding end of the machine body (1), the screw rod (22) is arranged along the width direction of the machine body (1), the drive end of the drive source (21) is connected to one end of the screw rod (22), any one of the positioning plates (2) is threadedly connected to the screw rod (22), and the other screw rod (22) is slidably sleeved on the screw rod (22).

7. A printing device according to claim 2, characterized in that: A longitudinal baffle (12) is provided at the feeding end of the machine body (1), a connecting piece (24) slides in contact with the baffle (12), and a cylinder (41) is mounted on the baffle (12).

8. A printing device according to claim 1, characterized in that: The negative pressure component comprises a negative pressure tube (33), a connecting tube (34) and an exhaust device. There are a plurality of negative pressure tubes (33), each of which is arranged at intervals along the length direction of the adsorption frame (3). A plurality of exhaust ports (331) are provided at the upper end of the negative pressure tube (33). The connecting tube (34) is connected to each of the negative pressure tubes (33), and the exhaust device is connected to the connecting tube (34).

9. A printing device according to claim 1, characterized in that: The movable partition plate (32) is provided with a plurality of grooves (321), the number of the grooves (321) being the same as the number of the partition plates (31), each partition plate (31) being slidably matched with respect to each groove (321), and the partition plates (31) are slidably fitted with the side walls of the grooves (321).

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