Single sheet front and back one pass inkjet printing apparatus

Abstract

The present application relates to printing equipment technical field, specifically to a kind of single sheet front and back disposable ink-jet printing equipment, including rack, paper feeding device being installed on rack, paper conveying device, ink-jet device, turnover device, paper conveying device and paper collecting device, turnover device includes turnover board and turnover paper mechanism, turnover board is the plate body formed by stainless steel plate after 180 degree rotation distortion, paper conveying device, turnover device and paper conveying device form closed loop of conveying paper, paper is 180 degree turned over by turnover board, only single ink-jet device is used to print on the front and back of paper, and turnover board replaces multiple cylinders in prior art, therefore compared with prior art, the number of cylinder and the number of ink-jet device are reduced, the structure of the above ink-jet printing equipment is simplified, and the weight of equipment and the cost of parts used in equipment manufacturing are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a one-time inkjet printing device for the front and back of a single sheet of paper. Background Art

[0002] The prior art patent number CN202121773710.X discloses a single-sheet front-and-back flipping inkjet printing device, which uses two inkjet devices to print on the front and back of the paper respectively. After one of the inkjet devices prints on the front of the paper, multiple rollers are used to flip the paper 180 degrees, and then the other inkjet device is used to print on the back of the paper. Since multiple rollers are used to flip the paper, not only the weight of the inkjet printing device is increased, but also the cost of accessories used in the manufacture of the equipment is increased. Summary of the Invention

[0003] The purpose of the present invention is to provide a single-sheet front and back inkjet printing device to overcome the problems existing in the existing devices.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a single-sheet front-and-back disposable inkjet printing device, comprising a frame, a paper feeding device mounted on the frame, a paper conveying device, an inkjet device, a flipping device, a paper conveying device and a paper receiving device, wherein the inkjet device is arranged above the paper conveying device, and the paper conveying device, the flipping device and the paper conveying device form a closed loop for conveying paper, and the flipping device comprises a flipping plate and a flipping paper feed mechanism, wherein the flipping plate is a plate body formed by rotating and twisting a stainless steel plate by 180 degrees, and the front and back sides of the flipping plate are curved surfaces formed by the twisting, and the flipping paper feed mechanism is connected to the paper conveying device, the first end of the flipping plate is located below the flipping paper feed mechanism, and a gap for receiving paper is formed between the first end of the flipping plate and the flipping paper feed mechanism, and the second end of the flipping plate is connected to the paper conveying device, the front side of the first end of the flipping plate is arranged upward and faces the flipping paper feed mechanism, and the back side of the second end of the flipping plate is also arranged upward, and the paper is flipped 180 degrees by being guided by the front side of the first end of the flipping plate and the back side of the second end of the flipping plate.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows:

[0006] Furthermore, the paper feeding device is located in front of the paper conveying device, and includes a paper suction feeder and a paper table. The paper suction feeder is located above the paper table, and the paper suction feeder is a pneumatic feeder.

[0007] Furthermore, the paper conveying device includes a printing roller, a first paper transfer roller and a second paper transfer roller. The printing roller, the first paper transfer roller and the second paper transfer roller are connected to the frame in sequence from back to front, and an inkjet device is provided directly above the printing roller.

[0008] Furthermore, gears are installed at the ends of the printing roller, the first paper transfer roller and the second paper transfer roller. The gear on the printing roller is engaged with the gear on the first paper transfer roller, and the gear on the first paper transfer roller is engaged with the gear on the second paper transfer roller. The drive motor is installed on the frame and is used to drive the printing roller, the first paper transfer roller and the second paper transfer roller to rotate. A transmission gear is connected and fixed to the output shaft of the drive motor, and the transmission gear is engaged with the gear on the printing roller.

[0009] Furthermore, the printing cylinder is a double-diameter cylinder, the first paper transfer cylinder and the second paper transfer cylinder are single-diameter cylinders, the diameter of the double-diameter cylinder is 300-800 mm, and the diameter of the single-diameter cylinder is 150-720 mm.

[0010] Furthermore, the paper conveying device includes a first paper feeding mechanism and a second paper feeding mechanism driven by a motor. The first paper feeding mechanism is arranged horizontally and the second paper feeding mechanism is arranged vertically. One end of the first paper feeding mechanism is connected to the paper suction feeder, and the other end is connected to the printing roller of the paper conveying device. The upper end of the second paper feeding mechanism is connected to the first paper feeding mechanism, and the lower end is connected to the flipping device.

[0011] Furthermore, the flipping paper feeding mechanism is connected to the second paper transfer roller, and the second end of the flip plate is connected to the lower end of the second paper feeding mechanism.

[0012] Furthermore, the paper receiving device is located at the rear side of the paper conveying device, and includes a paper receiving mechanism and a paper receiving platform. The paper receiving platform is connected to the paper conveying device through the paper receiving mechanism. The paper receiving mechanism is used to transport the printed paper to the paper receiving platform. One end of the paper receiving mechanism is close to the printing roller, and the other end is located above the paper receiving platform. The paper receiving mechanism includes a paper receiving conveyor belt for conveying paper and two paper receiving rollers connected to the paper receiving conveyor belt. A gear is installed on the end of one of the paper receiving rollers and meshes with the gear on the printing roller.

[0013] The beneficial effects of the present invention are as follows: in the above-mentioned inkjet printing device provided by the present invention, the paper conveying device, the flipping device and the paper feeding device form a closed loop for feeding paper. After the inkjet device prints on the front side of the paper, the paper is flipped 180 degrees by the flipping plate, and the paper is fed back to the inkjet device by the paper feeding device to print on the back side of the paper. Only a single inkjet device is required, and the flipping plate is used instead of the multiple rollers in the prior art. Therefore, compared with the prior art, the number of rollers and the number of inkjet devices are reduced, the structure of the above-mentioned inkjet printing device is simplified, and the weight of the equipment and the cost of accessories used in the equipment manufacturing are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] Figure 1This is a schematic structural diagram of a single-sheet front and back inkjet printing device provided by a preferred embodiment of the present invention;

[0016] Figure 2 It is along Figure 1 Cross-sectional view along line AA;

[0017] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle flip plate;

[0018] Figure 4 yes Figure 3 A schematic diagram of the structure of the middle flip plate from another angle;

[0019] In the figure: 10, paper feeding device; 11, paper suction feeder; 12, paper table; 20, paper conveying device; 21, printing roller; 22, first paper transfer roller; 23, second paper transfer roller; 24, gear; 25, drive motor; 30, paper collection device; 31, paper collection mechanism; 311, paper collection roller; 32, paper collection lifting drive motor; 33, paper collection table; 40, frame; 50, inkjet device; 60, flip device; 61, flip plate; 62, flip paper feed mechanism; 70, paper conveying device; 71, first paper feed mechanism; 72, second paper feed mechanism. DETAILED DESCRIPTION

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a single-sheet front and back disposable inkjet printing device, including a frame 40, a paper feeding device 10 installed on the frame 40, a paper conveying device 20, an inkjet device 50, a turning device 60, a paper conveying device 70 and a paper receiving device 30.

[0024] The paper feeding device 10 is located in front of the paper conveying device 70, and includes a paper suction feeder 11 and a paper table 12. The paper table 12 is used to place paper. The paper suction feeder 11 is located above the paper table 12. The paper suction feeder 11 is a pneumatic feeder used to absorb the paper on the paper table 12 and convey the paper to the paper conveying device 70.

[0025] The paper conveying device 20 includes a printing cylinder 21, a first transfer cylinder 22, and a second transfer cylinder 23. The printing cylinder 21, the first transfer cylinder 22, and the second transfer cylinder 23 are rotatably connected to a frame 40 from back to front. Gears 24 are mounted on the ends of the printing cylinder 21, the first transfer cylinder 22, and the second transfer cylinder 23. The gears 24 mesh with each other. The gear 24 on the printing cylinder 21 meshes with the gear 24 on the first transfer cylinder 22, and the gear 24 on the first transfer cylinder 22 meshes with the gear 24 on the second transfer cylinder 23. A drive motor 25 is mounted on the frame 40 to drive the printing cylinder 21, the first transfer cylinder 22, and the second transfer cylinder 23. A transmission gear is fixed to the output shaft of the drive motor 25 and meshes with the gear 24 on the printing cylinder 21. In this embodiment, the printing cylinder 21 rotates clockwise, and accordingly, the first transfer cylinder 22 rotates counterclockwise, and the second transfer cylinder 23 rotates clockwise. The printing cylinder 21 is a double-diameter cylinder, while the first and second transfer cylinders 22 and 23 are single-diameter cylinders. The diameter of the double-diameter cylinders is twice that of the single-diameter cylinders. In this embodiment, the diameter of the double-diameter cylinders is 300-800 mm, while the diameter of the single-diameter cylinders is 150-720 mm. An inkjet device 50 is located directly above the printing cylinder 21. The inkjet device 50 includes a nozzle for spraying ink.

[0026] The paper conveying device 70 includes a first paper feed mechanism 71 and a second paper feed mechanism 72, both driven by motors. The first paper feed mechanism 71 is arranged horizontally, while the second paper feed mechanism 72 is arranged vertically. One end of the first paper feed mechanism 71 is connected to the suction feeder 11, and the other end is connected to the printing cylinder 21 of the paper conveying device 20. The upper end of the second paper feed mechanism 72 is connected to the first paper feed mechanism 71, and the lower end is connected to the flipping device 60. The paper conveying device 20, the flipping device 60, the second paper feed mechanism 72, and the first paper feed mechanism 71 form a closed loop for conveying paper. The first and second paper feed mechanisms 71 and 72 each include a paper feed conveyor belt for conveying paper, a paper feed driving roller and a paper feed driven roller connected to the paper feed conveyor belt, and a paper feed drive motor for driving the paper feed driving roller. The paper feed drive motor drives the paper feed conveyor belt via the paper feed driving roller to convey paper, and the paper feed driven roller cooperates with the paper feed driven roller and, as needed, with an appropriate tensioning roller.

[0027] The flipping device 60 includes a flip plate 61 and a flip paper feed mechanism 62 driven by a motor. The flip plate 61 is a twisted stainless steel plate. The flip plate 61 is a plate body formed by rotating and twisting the stainless steel plate 180 degrees. The front and back sides of the flip plate 61 are curved surfaces formed by twisting. The flip paper feed mechanism 62 is connected to the second paper transfer roller 23. The first end of the flip plate 61 is located below the flip paper feed mechanism 62 and a gap for receiving paper is formed between the first end of the flip plate 61 and the flip paper feed mechanism 62. The second end of the flip plate 61 is connected to the lower end of the second paper feed mechanism 72. The front side of the first end of the flip plate 61 is set upward and faces the flip paper feed mechanism 62. The back side of the second end of the flip plate 61 is also set upward. The paper is guided by the front side of the first end of the flip plate 61 and the back side of the second end to achieve 180-degree flipping. The flipping and feeding mechanism 62 includes a flipping and feeding conveyor belt for conveying paper, a flipping and feeding driving roller and a flipping and feeding driven roller connected to the flipping and feeding conveyor belt, and a flipping and feeding drive motor for driving the flipping and feeding driving roller. The flipping and feeding drive motor drives the flipping and feeding conveyor belt via the flipping and feeding driving roller to convey paper, and the flipping and feeding driven roller cooperates with the flipping and feeding driven roller. By using the flipping plate 61 instead of the multiple rollers used in the prior art, the structure of the above-mentioned inkjet printing device is simplified.

[0028] The paper collection device 30 is located on the rear side of the paper conveying device 20, and includes a paper collection mechanism 31 and a paper collection platform 33. The paper collection platform 33 is connected to the paper conveying device 20 through the paper collection mechanism 31, and is driven to rise and fall by the paper collection lifting drive motor 32; the paper collection mechanism 31 is used to convey the printed paper to the paper collection platform 33. One end of the paper collection mechanism 31 is close to the printing cylinder 21, and the other end is located above the paper collection platform 33. The paper collection mechanism 31 includes a paper collection conveyor belt for conveying paper and two paper collection rollers 311 connected to the paper collection conveyor belt. A gear 24 is installed on the end of one of the paper collection rollers 311 and meshes with the gear 24 on the printing cylinder 21.

[0029] When the present invention is used, paper is placed on the paper table 12, and then the drive motor 25 is started. The drive motor 25 drives the printing roller 21, the first paper transfer roller 22 and the second paper transfer roller 23 to rotate. The paper suction flyer 11 absorbs the paper on the top of the paper table 12 and conveys the paper to the printing roller 21 through the first paper feeding mechanism 71. The paper rotates clockwise with the printing roller 21 so that the front side of the paper faces upward. The inkjet device 50 prints on the front side of the paper. After the printing is completed, the paper is transferred in sequence through the first paper transfer roller 22 and the second paper transfer roller 23; then the paper is transferred to the flip feeder by the second paper transfer roller 23. The front side of the paper is facing upwards in the gap between the flip plate 62 and the first end of the flip plate 61. The flipping paper feed mechanism 62 presses the paper and carries the paper forward, so that the paper moves from the front side of the first end of the flip plate 61 to the back side of the second end and is flipped 180 degrees. At this time, the back side of the paper is facing upwards. After the flipping is completed, the paper is sequentially conveyed to the printing roller 21 through the second paper feed mechanism 72 and the first paper feed mechanism 71. When the paper reaches the printing roller 21 again, the back side of the paper is facing upwards, and the inkjet device 50 prints on the back side of the paper. Finally, the printed paper is conveyed to the paper receiving table 33 through the paper receiving mechanism 31.

[0030] In the above-mentioned inkjet printing device provided by the present invention, the paper conveying device 20, the flipping device 60 and the paper feeding device 70 form a closed loop for conveying paper. After the inkjet device 50 prints on the front side of the paper, the paper is flipped 180 degrees by the flipping plate 61, and the paper is conveyed back to the inkjet device 50 by the paper feeding device 70 to print on the back side of the paper. Only a single inkjet device 50 is required, and the flipping plate 61 is used to replace the multiple rollers in the prior art. Therefore, compared with the prior art, the number of rollers and the number of inkjet devices 50 as consumables are reduced, the structure of the above-mentioned inkjet printing device is simplified, and the weight of the equipment and the cost of accessories used in the equipment manufacturing are reduced.

[0031] Any matters not mentioned in the above specific embodiments of the present invention belong to the common knowledge in this field and can be implemented with reference to the common knowledge.

[0032] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A single-sheet front-and-back inkjet printing device comprising a frame, a paper feeder mounted on the frame, a paper conveyor, an inkjet device, a turning device, a paper conveying device, and a paper delivery device, characterized in that: The inkjet device is arranged above the paper conveying device. The paper conveying device, the turning device and the paper feeding device form a closed loop for conveying paper. The turning device includes a turning plate and a turning paper feeding mechanism. The turning plate is a plate body formed by rotating and twisting a stainless steel plate 180 degrees. The front and back sides of the turning plate are curved surfaces formed by the twisting. The turning paper feeding mechanism is connected to the paper conveying device. The first end of the turning plate is located below the turning paper feeding mechanism and a gap for receiving paper is formed between the first end of the turning plate and the turning paper feeding mechanism. The second end of the turning plate is connected to the paper feeding device. The front side of the first end of the turning plate is arranged upward and faces the turning paper feeding mechanism. The back side of the second end of the turning plate is also arranged upward. The paper is turned 180 degrees under the guidance of the front side of the first end of the turning plate and the back side of the second end of the turning plate. The paper feeding device is located in front of the paper conveying device and includes a paper suction feeder; the paper conveying device includes a printing cylinder, a first paper transfer cylinder and a second paper transfer cylinder, and the printing cylinder, the first paper transfer cylinder and the second paper transfer cylinder are connected to the frame in a rotational manner from back to front; The paper conveying device includes a first paper feed mechanism and a second paper feed mechanism driven by a motor, the first paper feed mechanism being arranged horizontally and the second paper feed mechanism being arranged vertically, one end of the first paper feed mechanism being connected to a paper suction feeder and the other end being connected to a printing cylinder of a paper conveying device, the upper end of the second paper feed mechanism being connected to the first paper feed mechanism and the lower end being connected to a turning device; the turning paper feed mechanism being connected to a second paper transfer cylinder, and the second end of a turning plate being connected to a lower end of the second paper feed mechanism; The paper is transferred to the gap between the flip paper feed mechanism and the first end of the flip plate via the second paper transfer roller, so that the front side of the paper faces upward. The flip paper feed mechanism presses the paper and moves it forward, so that the paper moves from the front side of the first end of the flip plate to the back side of the second end, and is flipped 180 degrees so that the back side of the paper faces upward.

2. The single-sheet front and back inkjet printing device according to claim 1, characterized in that: The paper feeding device also includes a paper table. A paper suction feeder is located above the paper table and is a pneumatic feeder.

3. The sheet-fed front and back inkjet printing device according to claim 2, characterized in that: An inkjet device is provided just above the printing cylinder.

4. The single-sheet front and back inkjet printing device according to claim 3, characterized in that: The ends of the printing cylinder, the first paper transfer cylinder and the second paper transfer cylinder are all equipped with gears, the gear on the printing cylinder is meshed with the gear on the first paper transfer cylinder, and the gear on the first paper transfer cylinder is meshed with the gear on the second paper transfer cylinder. The driving motor is installed on the frame and is used to drive the printing cylinder, the first paper transfer cylinder and the second paper transfer cylinder to rotate. A transmission gear is connected and fixed to the output shaft of the driving motor, and the transmission gear is meshed with the gear on the printing cylinder.

5. The single-sheet front and back inkjet printing device according to claim 4, characterized in that: The printing cylinder is a double-diameter cylinder, and the first paper transfer cylinder and the second paper transfer cylinder are single-diameter cylinders. The diameter of the double-diameter cylinder is 300-800 mm, and the diameter of the single-diameter cylinder is 150-720 mm.

6. The single-sheet front and back inkjet printing device according to claim 4, characterized in that: The paper receiving device is located at the rear side of the paper conveying device, and includes a paper receiving mechanism and a paper receiving platform. The paper receiving platform is connected to the paper conveying device through the paper receiving mechanism. The paper receiving mechanism is used to transport the printed paper to the paper receiving platform. One end of the paper receiving mechanism is close to the printing roller, and the other end is located above the paper receiving platform. The paper receiving mechanism includes a paper receiving conveyor belt for conveying paper and two paper receiving rollers connected to the paper receiving conveyor belt. A gear is installed on the end of one of the paper receiving rollers and meshes with the gear on the printing roller.

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