Single-face and double-face printing switching mechanism and digital ink-jet printer

Abstract

The utility model discloses a single-face and double-face printing switching mechanism and a digital ink-jet printer. The single-face and double-face printing switching mechanism is arranged on the paper output side of a jet printing paper conveying unit of the ink-jet printer and comprises a paper collecting air suction roller, a paper returning air suction roller and a detection sensor, and the detection sensor detects the position of paper and transmits a signal to the controller; the paper collecting air suction roller and the paper returning air suction roller are arranged on the downstream portion of the paper supporting plate, a paper turning gap is formed between the paper collecting air suction roller and the paper supporting plate, and the paper returning air suction roller is used for converting and turning over the paper head and the paper tail of paper and then returning the paper back to the jet printing paper conveying unit from the paper turning gap. The paper collecting air suction roller is used for conveying the printed paper to the paper collecting unit. The paper feeding device is more compact and reasonable in structural design, stable and reliable in work, short in paper conveying path and small in occupied space.

Description

Technical Field

[0001] The utility model belongs to the technical field of inkjet printing machinery, and particularly relates to a single-sided and double-sided printing conversion mechanism and a digital inkjet printer. Background Art

[0002] Single-sheet digital inkjet printing machinery can perform single-sided or double-sided printing operations on single sheets according to customer printing requirements.

[0003] The applicant recently disclosed a toothless drum type single-nozzle digital inkjet printer and a printing control method (CN117445562A). By using a single set of inkjet heads, i.e., a single set of inkjet systems, and alternately operating the paper turning suction wheel and the sheet receiving suction wheel to turn over or output the paper, single-sided or double-sided printing operations can be achieved. In this solution, the sheet receiving suction wheel is arranged downstream of the paper turning suction wheel. The paper turning suction wheel turns over the paper head and paper tail of the paper and then sends it back to the printing paper transfer unit. The sheet receiving suction wheel conveys the printed paper to the sheet receiving unit. It has the advantages of simple structural design, stable and reliable operation. However, this layout is still not compact enough in terms of structural design, and during the sheet receiving operation, since the sheet receiving suction wheel is downstream of the paper turning suction wheel, the sheet receiving path is long, resulting in low printing efficiency. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a single-sided and double-sided printing conversion mechanism with a more compact and reasonable structural design, more convenient control operation, and higher efficiency.

[0005] To solve the above technical problem, the technical solution of the utility model is: a single-sided and double-sided printing conversion mechanism is arranged on the paper output side of the printing paper transfer unit of an inkjet printer. A paper support plate is arranged on the paper output side of the printing paper transfer unit. The mechanism includes a sheet receiving suction roller, a paper returning suction roller, and a detection sensor. The detection sensor detects the position of the paper and transmits a signal to the controller. The sheet receiving suction roller and the paper returning suction roller are arranged downstream of the paper support plate. A paper turning gap is formed between the sheet receiving suction roller and the paper support plate. The paper returning suction roller is used to turn over the paper head and paper tail of the paper and then send it back to the printing paper transfer unit through the paper turning gap. The sheet receiving suction roller is used to convey the printed paper to the sheet receiving unit.

[0006] Of course, the paper receiving air suction roller or the paper returning air suction roller can also be implemented in a wheel structure, which shall fall within the protection scope of the present utility model. That is, the following solutions: a single-sided and double-sided printing conversion mechanism is arranged on the paper output side of the printing and paper transfer unit of the inkjet printer. A paper support plate is arranged on the paper output side of the printing and paper transfer unit, including a paper receiving air suction wheel, a paper returning air suction wheel and a detection sensor. The detection sensor detects the position of the paper and transmits a signal to the controller. The paper receiving air suction wheel and the paper returning air suction wheel are arranged downstream of the paper support plate. A paper turning gap is formed between the paper receiving air suction wheel and the paper support plate. The paper returning air suction wheel is used to turn the paper head and paper tail of the paper over and send it back to the printing and paper transfer unit through the paper turning gap. The paper receiving air suction wheel is used to transfer the printed paper to the paper receiving unit.

[0007] As one of the technical solutions, the paper receiving air suction roller and the paper returning air suction roller are arranged vertically opposite to each other, and the paper receiving air suction roller is arranged above the paper returning air suction roller. The rotation direction of the paper receiving air suction roller is the same as that of the paper returning air suction roller.

[0008] As a preferred technical solution, a paper pressing mechanism is arranged above the paper turning gap.

[0009] As a preferred technical solution, the paper pressing mechanism is a paper pressing wheel or a positive pressure air nozzle.

[0010] As another technical solution, the paper receiving air suction roller and the paper returning air suction roller are arranged vertically offset from each other, and the paper receiving air suction roller is arranged below the paper returning air suction roller. The paper returning air suction roller can move up and down. The rotation direction of the paper receiving air suction roller is the same as that of the paper returning air suction roller.

[0011] As a preferred technical solution, a paper guiding mechanism is arranged below the paper turning gap.

[0012] As a preferred technical solution, the paper guiding mechanism is a paper guiding plate arranged obliquely.

[0013] As a preferred technical solution, the paper receiving air suction roller or the paper returning air suction roller includes a roller body. Two or more rows of air holes are formed on the surface of the roller body. Air ducts are respectively arranged in the roller body corresponding to each air exhaust hole. The air ducts are communicated with the corresponding air holes. A conduction member is arranged at the end of the roller body in a matching manner. The roller body and the conduction member can rotate relative to each other. The conduction member is connected to a negative pressure device through a pipeline, and an electromagnetic control valve is installed on the pipeline.

[0014] Compared with the prior art, the utility model has at least the following beneficial effects: When performing the paper receiving operation, the paper returning suction roller is in an idling state with suction disconnected, while the paper receiving suction roller is in a working state with suction turned on. The paper output from the inkjet paper transfer unit is adsorbed by the paper receiving suction roller and transmitted to the paper receiving unit for paper receiving; when the paper needs to be turned over, the detection sensor detects the position of the paper and transmits a signal to the controller. When the paper output from the inkjet paper transfer unit is adsorbed by the paper receiving suction roller and transmitted to the set position, the paper returning suction roller switches to the working state with suction turned on, while the paper receiving suction roller is in an idling state with suction disconnected. The paper returning suction roller adsorbs the paper tail, and the paper is returned to the inkjet paper transfer unit again after being transferred through the paper turning gap. Through such a clever design, by using the paper receiving suction roller and the paper returning suction roller arranged up and down, and by controlling the working states of the paper receiving suction roller and the paper returning suction roller, the conversion between paper receiving and turning over can be realized, so as to realize the single-sided printing or double-sided printing operation of single sheets of paper. The structural design is more compact and reasonable, the work is stable and reliable, the paper transmission path is short, and the occupied space is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model. Among them:

[0016] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0017] Figure 2 is a front view structural diagram of the paper receiving suction roller in Embodiment 1 of the present utility model;

[0018] Figure 3 is Figure 2 the sectional structural diagram in the A-A direction of

[0019] Figure 4 is a left view structural diagram of the paper receiving suction roller in Embodiment 1 of the present utility model;

[0020] Figure 5 is a schematic diagram of paper transmission when performing single-sided printing in Embodiment 1 of the present utility model;

[0021] Figure 6 is a schematic diagram of paper transmission when performing double-sided printing in Embodiment 1 of the present utility model;

[0022] Figure 7 is a schematic structural diagram of Embodiment 2 of the present utility model;

[0023] Figure 8 is a schematic diagram of paper transmission when performing single-sided printing in Embodiment 2 of the present utility model;

[0024] Figure 9 is a schematic diagram of paper transmission when performing double-sided printing in Embodiment 2 of the present utility model. Detailed implementation mode

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. Without doubt, those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.

[0026] Embodiment 1

[0027] As Figure 1 shown, the digital inkjet printer includes a paper feeding unit 1, a paper receiving unit 2, an inkjet printing and paper transfer unit 3, an inkjet head 4, and a single-sided / double-sided printing conversion mechanism. The single-sided / double-sided printing conversion mechanism is arranged on the paper output side of the inkjet printing and paper transfer unit 3, and a paper supporting plate 5 is arranged on the paper output side of the inkjet printing and paper transfer unit 3.

[0028] The single-sided / double-sided printing conversion mechanism includes a paper receiving suction roller 6, a paper returning suction roller 7, a detection sensor 8, and a controller. The detection sensor 8 is used to detect the position of the paper and transmit a signal to the controller. The paper receiving suction roller 6 and the paper returning suction roller 7 are arranged downstream of the paper supporting plate 5. The paper receiving suction roller 6 and the paper returning suction roller 7 are arranged opposite to each other up and down, and the paper receiving suction roller 6 is arranged above the paper returning suction roller 7. The rotation direction of the paper receiving suction roller 6 is the same as that of the paper returning suction roller 7 (both are counterclockwise); a paper turning gap 11 is formed between the paper receiving suction roller 6 and the paper supporting plate 5.

[0029] In order to improve the transfer effect, a paper pressing mechanism 9 is preferably arranged above the paper turning gap 11. The paper pressing mechanism 9 can be a lifting paper pressing wheel, or a positive pressure air nozzle can also be used. When turning the paper, the paper tail is pressed against the surface of the paper returning suction roller 7 through the paper pressing mechanism 9, so that the paper returning suction roller 7 can quickly adsorb the paper tail. A paper guiding plate 10 is arranged below the paper turning gap 11 to facilitate the transfer and guiding of the paper.

[0030] Refer to Figures 2 to 4, the sheet receiving suction roller 6 includes a roller body 61, on the surface of the roller body 61, there are provided more than two rows of air holes 62, inside the roller body 61, corresponding to each air exhaust hole 62, there is respectively provided an air duct 63, and the air duct 63 is communicated with the corresponding air hole 62; at the end of the roller body 61, there is cooperatively provided a conducting member 64, the roller body 61 and the conducting member 64 can rotate relatively, the conducting member 64 is connected to a negative pressure device through a pipeline, and an electromagnetic control valve is installed on the pipeline; thus, a switchable negative pressure adsorption area is formed inside the conducting member 64; when the roller body 61 rotates, each air duct 63 passes through the negative pressure adsorption area in sequence and is communicated with the adsorption area, so that the air holes corresponding to the air ducts rotating to the adsorption area will instantaneously adsorb the paper arriving here, playing the role of the gripper "bite", and the paper head is subjected to a large negative pressure adsorption effect, and will be instantaneously adsorbed to the roller surface and accurately positioned. The structure principle of the paper returning suction roller 7 is the same as that of the sheet receiving suction roller 6, and will not be elaborated here.

[0031] The working principle of the present utility model is as follows:

[0032] Reference Figure 5 , during single-sided printing, the paper feeding unit 1 conveys the paper to the inkjet printing paper transfer unit 3, the inkjet head 4 performs single-sided printing on the paper, the paper returning suction roller 7 is in an idling state with suction off, while the sheet receiving suction roller 6 is in a working state with suction on, and the paper completed with single-sided printing output from the inkjet printing paper transfer unit 3 is directly conveyed to the sheet receiving unit 2 for sheet receiving after being adsorbed by the sheet receiving suction roller 6;

[0033] Reference Figure 6 , when double-sided printing is required, the paper completed with single-sided printing output from the inkjet printing paper transfer unit 3 first moves forward a certain distance along with the sheet receiving suction roller 6. When the detection sensor 8 detects that the paper reaches the set position, it transmits a signal to the controller. At this time, the paper returning suction roller 7 switches to a working state with suction on, while the sheet receiving suction roller 6 switches to an idling state with suction off. At the same time, the paper pressing mechanism 9 presses the paper tail against the surface of the sheet receiving suction roller 6, and the paper returning suction roller 7 adsorbs the paper tail. At this time, the paper tail is converted into the paper head, and the paper is brought into the guide paper board 10 from the paper turning gap 11, and then returns to the inkjet printing paper transfer unit 3 for reverse printing after being transferred.

[0034] Embodiment 2

[0035] As Figure 7 shown, the digital inkjet printer includes a paper feeding unit 1, a sheet receiving unit 2, an inkjet printing paper transfer unit 3, an inkjet head 4 and a single / double-sided printing conversion mechanism. The single / double-sided printing conversion mechanism is arranged on the paper output side of the inkjet printing paper transfer unit 3, and a paper supporting board 5 is arranged on the paper output side of the inkjet printing paper transfer unit 3.

[0036] The single-sided and double-sided printing conversion mechanism includes a paper receiving suction roller 6, a paper returning suction roller 7, a detection sensor 8 and a controller. The detection sensor 8 is used to detect the position of the paper and transmit a signal to the controller. The paper receiving suction roller 6 and the paper returning suction roller 7 are arranged downstream of the paper supporting plate 5. In this embodiment, the paper receiving suction roller 6 and the paper returning suction roller 7 are arranged in an offset manner vertically, and the paper receiving suction roller 6 is arranged below and to the side of the paper returning suction roller 7, and the paper returning suction roller 7 can move up and down; the rotation direction of the paper receiving suction roller 6 is the same as that of the paper returning suction roller 6 (both are clockwise). A paper turning gap 11 is formed between the paper receiving suction roller 6 and the paper supporting plate 5.

[0037] The working principle of the present utility model is as follows:

[0038] Reference Figure 8 , during single-sided printing, the paper feeding unit 1 conveys the paper to the inkjet printing and paper transfer unit 3, and the inkjet head 4 performs single-sided printing on the paper. The paper returning suction roller 7 is in an idle rotation state with suction off, while the paper receiving suction roller 6 is in a working state with suction on. The paper that has completed single-sided printing and is output from the inkjet printing and paper transfer unit 3 is directly conveyed to the paper receiving unit 2 for paper receiving after being adsorbed by the paper receiving suction roller 6;

[0039] Reference Figure 9 , when double-sided printing is required, the paper that has completed single-sided printing and is output from the inkjet printing and paper transfer unit 3 first moves forward a certain distance along with the paper receiving suction roller 6. When the detection sensor 8 detects that the paper reaches the set position, it transmits a signal to the controller. At this time, the paper returning suction roller 7 switches to a working state with suction on and moves downward, while the paper receiving suction roller 6 switches to an idle rotation state with suction off. The paper returning suction roller 7 adsorbs the paper tail, and at this time the paper tail is converted into the paper head. The paper is brought into the lower suction conveyor belt from the paper turning gap 11, and then after being transferred, it returns to the inkjet printing and paper transfer unit 3 for reverse printing.

[0040] It should be noted that the transfer method for the paper that has completed front printing to return to the inkjet printing and paper transfer unit can be achieved by various methods such as a suction wheel, a suction belt, a paper conveying belt, or using a suction drum for transition. Those skilled in the art can easily implement the specific transfer method and transfer path, and will not be elaborated here. They should all fall within the protection scope of the present utility model.

[0041] Through ingenious design, the present utility model utilizes the paper receiving suction roller (wheel) and the paper returning suction roller (wheel). By controlling the working states of the paper receiving suction roller and the paper returning suction roller, the conversion between paper receiving and turning can be realized, thereby realizing single-sided or double-sided inkjet printing operations for single sheets of paper. The structure design is more compact and reasonable, the work is stable and reliable, the paper transmission path is short, and the occupied space is small.

[0042] The above are only illustrative specific embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present utility model shall fall within the scope of protection of the present utility model.

Claims

1. A single-sided and double-sided printing conversion mechanism is arranged on the paper output side of the printing and paper feeding unit of an inkjet printer. A paper support plate is arranged on the paper output side of the printing and paper feeding unit. It is characterized in that: It includes a paper receiving suction roller, a paper returning suction roller and a detection sensor. The detection sensor detects the position of the paper and transmits a signal to the controller. The paper receiving suction roller and the paper returning suction roller are arranged downstream of the paper supporting board. A paper turning gap is formed between the paper receiving suction roller and the paper supporting board. The paper returning suction roller is used to turn the head and tail of the paper over and then send it back to the inkjet paper transfer unit through the paper turning gap. The paper receiving suction roller is used to transfer the printed paper to the paper receiving unit.

2. The single-sided and double-sided printing conversion mechanism according to claim 1, characterized in that: The paper receiving suction roller and the paper returning suction roller are arranged vertically opposite to each other, and the paper receiving suction roller is arranged above the paper returning suction roller. The rotation direction of the paper receiving suction roller is the same as that of the paper returning suction roller.

3. The single-sided and double-sided printing conversion mechanism according to claim 2, wherein: A paper pressing mechanism is arranged above the paper turning gap.

4. The single-sided and double-sided printing conversion mechanism according to claim 3, wherein: The paper pressing mechanism is a paper pressing wheel or a positive pressure air nozzle.

5. The single-sided and double-sided printing conversion mechanism according to claim 1, characterized in that: The paper receiving suction roller and the paper returning suction roller are arranged vertically offset, and the paper receiving suction roller is arranged below the paper returning suction roller. The paper returning suction roller can move up and down. The rotation direction of the paper receiving suction roller is the same as that of the paper returning suction roller.

6. The single-sided and double-sided printing conversion mechanism according to claim 1, wherein: A paper guiding mechanism is arranged below the paper turning gap.

7. The single-sided and double-sided printing conversion mechanism according to claim 6, characterized in that: The paper guiding mechanism is a paper guiding board arranged obliquely.

8. The single-sided and double-sided printing conversion mechanism according to claim 1, characterized in that: The paper receiving suction roller or the paper returning suction roller includes a roller body. Two or more rows of air holes are formed on the surface of the roller body. Air ducts are respectively arranged in the roller body corresponding to each air exhaust hole. The air ducts are communicated with the corresponding air holes. A conducting part is arranged at the end of the roller body in a matching way. The roller body and the conducting part can rotate relatively. The conducting part is connected to a negative pressure device through a pipeline, and an electromagnetic control valve is installed on the pipeline.

9. Single-sided and double-sided printing conversion mechanism, which is arranged on the paper output side of the printing and paper transfer unit of the inkjet printer. A paper support plate is arranged on the paper output side of the printing and paper transfer unit. It is characterized in that: It includes a paper receiving suction wheel, a paper returning suction wheel and a detection sensor. The detection sensor detects the position of the paper and transmits a signal to the controller. The paper receiving suction wheel and the paper returning suction wheel are arranged downstream of the paper supporting board. A paper turning gap is formed between the paper receiving suction wheel and the paper supporting board. The paper returning suction wheel is used to turn the head and tail of the paper over and then send it back to the inkjet paper transfer unit through the paper turning gap. The paper receiving suction wheel is used to transfer the printed paper to the paper receiving unit.

10. Digital inkjet printer, comprising a paper feeding unit, an inkjet paper transfer unit and a paper receiving unit, characterized in that: A single-sided and double-sided printing conversion mechanism as described in any one of claims 1 to 9 is arranged between the inkjet paper transfer unit and the paper receiving unit.

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