Paper collecting and turning-over switching mechanism and digital ink-jet printer

Abstract

The utility model discloses a paper collecting and turning conversion mechanism and a digital ink-jet printer. The paper collecting and turning-over switching mechanism is arranged on the paper output side of a jet printing paper conveying unit of the ink-jet printer and comprises an air suction roller, a detection sensor and a controller, and the air suction roller is connected with a forward and reverse rotation driving mechanism. During paper collecting operation, the forward and reverse rotation driving mechanism drives the air suction roller to keep forward rotation, and paper output from the jet printing paper conveying unit is adsorbed by the air suction roller and conveyed to the paper collecting unit to be collected. When the paper needs to be turned over, the detection sensor detects the position of the paper and transmits a signal to the controller, the air suction roller absorbs the tail of the paper and then rotates reversely, and the paper is transmitted from the paper turning gap and then returns to the jet printing paper conveying unit again. According to the utility model, only one air suction roller capable of rotating forwards and backwards is utilized to realize conversion between paper collection and surface turning, so that single-surface jet printing or double-surface jet printing operation of a single piece of paper is realized, the structural design is more compact and reasonable, the work is stable and reliable, the occupied space is small, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of inkjet printing machinery, and particularly relates to a paper receiving and turning conversion mechanism and a digital inkjet printer. Background Art

[0002] Single-sheet digital inkjet printing machinery can perform single-sided printing 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 group of inkjet heads, that is, a single set of inkjet systems, the paper is turned over or output by alternately operating the paper turning air suction wheel and the paper receiving air suction wheel, so as to realize single-sided printing or double-sided printing operations. In this solution, the paper receiving air suction wheel is arranged downstream of the paper turning air suction wheel. The paper turning air 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 paper receiving air suction wheel transfers the printed paper to the paper receiving unit. It has the advantages of simple structure design and stable and reliable operation. However, in terms of structural design, this arrangement is still not compact enough and needs to be further improved. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a paper receiving and turning conversion mechanism with a simpler, more compact and reasonable structural design.

[0005] To solve the above technical problem, the technical solution of the utility model is: a paper receiving and turning 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 paper receiving and turning conversion mechanism includes a suction roller, a detection sensor and a controller. The suction roller is arranged downstream of the paper support plate. A paper turning gap is formed between the suction roller and the paper support plate. The suction roller is connected with a forward and reverse drive mechanism. During the paper receiving operation, the forward and reverse drive mechanism drives the suction roller to keep rotating forward, and the paper output from the printing paper transfer unit is adsorbed by the suction roller and transferred 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. After the suction roller adsorbs the paper tail, it rotates reversely, and the paper returns to the printing paper transfer unit again after being transferred through the paper turning gap.

[0006] As a preferred technical solution, a paper pressing mechanism is arranged above the paper turning gap.

[0007] As a preferred technical solution, the paper pressing mechanism is a paper pressing wheel or a positive pressure air nozzle.

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

[0009] As a preferred technical solution, the paper guiding mechanism is an inclined paper guide plate.

[0010] As a preferred technical solution, the air suction roller includes a roller body, on the surface of which there are provided more than two rows of air holes, and corresponding to each row of air holes in the roller body, there is respectively provided an air duct, and the air duct is communicated with the corresponding air hole; a conduction member is cooperatively provided at the end of the roller body, the roller body and the conduction member can rotate relative to each other, and the conduction member is connected to a negative pressure device through a pipeline.

[0011] As a preferred technical solution, the forward and reverse drive mechanism is a servo motor.

[0012] Compared with the prior art, the present utility model has at least the following beneficial effects: during the paper receiving operation, the forward and reverse drive mechanism drives the air suction roller to rotate forward, and the paper output from the inkjet paper transfer unit is adsorbed by the air 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, the air suction roller adsorbs the paper tail and then rotates reversely, and the paper returns to the inkjet paper transfer unit again after passing through the paper turning gap. In this way, through ingenious design, only by using an air suction roller that can rotate forward and reverse, the conversion between paper receiving and turning over can be realized, so as to realize single-sided printing or double-sided printing operations of single sheets of paper. The structure design is more compact and reasonable, the work is stable and reliable, the occupied space is small, the manufacturing cost is low, and it has a broad market prospect. Description of the Drawings

[0013] 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:

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 is a front view structural schematic diagram of the air suction roller in the embodiment of the present utility model;

[0016] Figure 3 is Figure 2 a cross-sectional structural schematic diagram taken along the A-A direction in

[0017] Figure 4 is a left view structural schematic diagram of the air suction roller in the embodiment of the present utility model;

[0018] Figure 5 is a schematic diagram of paper transmission during single-sided printing in the embodiment of the present utility model;

[0019] Figure 6 is a schematic diagram of paper transmission during double-sided printing in the embodiment of the present utility model. Detailed Embodiments

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It goes without saying that 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.

[0021] As Figure 1 shown, the digital inkjet printer includes a paper feeding unit 1, a paper receiving unit 2, an inkjet paper transfer unit 3, an inkjet head 4, and a paper receiving and turning conversion mechanism. The paper receiving and turning conversion mechanism is arranged on the paper output side of the inkjet paper transfer unit 3, and a paper support plate 5 is arranged on the paper output side of the inkjet paper transfer unit 3.

[0022] The paper receiving and turning conversion mechanism includes a suction roller 6, a detection sensor 9, and a controller. The suction roller 6 is arranged downstream of the paper support plate 5. A paper turning gap 7 is formed between the suction roller 6 and the paper support plate 5. The suction roller 6 is connected with a forward and reverse drive mechanism (not shown in the figure). The forward and reverse drive mechanism can adopt a servo motor to drive the suction roller 6 to rotate forward or reverse according to the operation requirements.

[0023] In order to improve the transfer effect, a paper pressing mechanism is preferably arranged above the paper turning gap 7. The paper pressing mechanism can be a lifting paper pressing wheel or a positive pressure air nozzle. When turning the paper, the paper tail is pressed against the surface of the suction roller 6 through the paper pressing mechanism, so that the suction roller 6 can quickly adsorb the paper tail. A paper guide plate 8 is arranged below the paper turning gap 7 to facilitate the transfer and guiding of the paper.

[0024] Referring Figures 2 to 4 , the suction roller 6 includes a roller body 61. Two or more rows of air holes 62 are formed on the surface of the roller body 61. Air ducts 63 are respectively arranged in the roller body 61 corresponding to the air holes 62. The air ducts 63 are communicated with the corresponding air holes 62. A conducting member 64 is arranged at the end of the roller body 61 in a matching manner. The roller body 61 and the conducting member 64 can rotate relatively. The conducting member 64 is connected with a negative pressure device through a pipeline, so that a negative pressure adsorption area is formed in the conducting member 64. When the roller body 61 rotates, each air duct 63 passes through the negative pressure adsorption area in turn and is communicated with the adsorption area. Thus, the air holes corresponding to the air ducts rotating to the adsorption area will form an instantaneous adsorption on the paper reaching here, playing the role of a gripper "bite". The paper head is subjected to a large negative pressure adsorption effect and will be instantaneously adsorbed to the roller surface and accurately positioned.

[0025] The working principle of the present utility model is as follows:

[0026] Referring Figure 5, during single-sided printing, the forward and reverse drive mechanism drives the air suction roller 6 to rotate forward. The paper that has completed single-sided printing and is output from the inkjet paper transfer unit 3 is adsorbed by the air suction roller 6 and directly conveyed to the paper receiving unit 2 for paper receiving;

[0027] Reference Figure 6 , when double-sided printing is required, the paper that has completed single-sided printing and is output from the inkjet paper transfer unit 3 is first conveyed forward by a certain distance along with the forward-rotating air suction roller 6. When the detection sensor 9 detects that the paper tail reaches the set position, it transmits a signal to the controller. The paper pressing mechanism presses the paper tail against the surface of the air suction roller 6. While the air suction roller 6 adsorbs the paper tail, it stops rotating forward and rotates in the reverse direction. At this time, the paper tail is converted into the paper head, and the paper is led into the guide paper board 8 from the paper turning gap 7, and then returns to the inkjet paper transfer unit 3 after being conveyed for reverse printing.

[0028] It should be noted that the transfer method of the paper that has completed front-side printing and returns to the inkjet paper transfer unit can be achieved by various methods such as an air suction wheel, an air suction belt, a paper conveyor belt, or using an air 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 invention.

[0029] The above are only illustrative specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. The paper receiving and turning conversion mechanism is arranged on the paper output side of the inkjet printing and paper transfer unit of the inkjet printer. A paper supporting plate is arranged on the paper output side of the inkjet printing and paper transfer unit. It is characterized in that: It includes a suction roller, a detection sensor and a controller. The suction roller is arranged downstream of the paper support board. A paper turning gap is formed between the suction roller and the paper support board. The suction roller is connected with a forward and reverse drive mechanism. During the paper collection operation, the forward and reverse drive mechanism drives the suction roller to rotate forward. The paper output from the inkjet paper transfer unit is adsorbed by the suction roller and transmitted to the paper collection unit for paper collection. When the paper needs to be turned over, the detection sensor detects the position of the paper and transmits a signal to the controller. After the suction roller adsorbs the paper tail, it rotates in the reverse direction, and the paper returns to the inkjet paper transfer unit again after being transferred through the paper turning gap.

2. The sheet receiving and turning conversion mechanism according to claim 1, wherein: A paper pressing mechanism is arranged above the paper turning gap.

3. The paper receiving and turning conversion mechanism according to claim 2, wherein: The paper pressing mechanism is a paper pressing wheel or a positive pressure air nozzle.

4. The sheet collecting and turning conversion mechanism according to claim 1, characterized in that: A paper guiding mechanism is arranged below the paper turning gap.

5. The sheet receiving and turning conversion mechanism according to claim 4, characterized in that: The paper guiding mechanism is an inclined paper guide board.

6. The sheet receiving and turning conversion mechanism according to claim 1, wherein: The suction roller includes a roller body. More than two 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 exhaust air hole, and the air ducts are communicated with the corresponding air holes. A conduction member is cooperatively arranged at the end of the roller body. 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.

7. The sheet receiving and turning conversion mechanism according to claim 1, characterized in that: The forward and reverse drive mechanism is a servo motor.

8. Digital inkjet printer, comprising a paper feeding unit, an inkjet paper transfer unit and a paper receiving unit, characterized in that: A paper collection and turning conversion mechanism as described in any one of claims 1 to 6 is arranged between the inkjet paper transfer unit and the paper collection unit.

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