CN212684973U - Sheet overturning structure of double-sided offset printing equipment - Google Patents
Sheet overturning structure of double-sided offset printing equipment Download PDFInfo
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- CN212684973U CN212684973U CN202020956757.9U CN202020956757U CN212684973U CN 212684973 U CN212684973 U CN 212684973U CN 202020956757 U CN202020956757 U CN 202020956757U CN 212684973 U CN212684973 U CN 212684973U
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- offset printing
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Abstract
The utility model relates to an offset press field discloses a sheet flip structure of two-sided offset printing equipment, including set up in first offset printing roller (1) with the first face contact of printing medium, with the second offset printing roller (2) of the second face contact of printing medium between the driving roller group, its characterized in that: the transmission roller group comprises a first transmission roller (3), a second transmission roller (4) and a turnover roller (5), wherein the front edge port and the rear edge port of the turnover roller (5) are provided with first grippers, a blowing device (6) is arranged between the first transmission roller (3) and the second transmission roller (4), and the second transmission roller (4) is provided with a suction device (7); other advantages of the utility model include shorter printing preparation time and higher quality paper pile, when the printing surface unevenness, after having increased the two-sided printing function, the efficiency of use equipment is higher.
Description
Technical Field
The utility model relates to an offset press field especially relates to a sheet flip structure of two-sided offset printing equipment.
Background
Offset printing is a kind of offset printing, and is simply a printing method of transferring images and texts on a printing plate to a printing stock by means of rubber, and is just the existence of a rubber blanket, and the printing method is named.
The use principle of the prior double-sided multicolor printing needs two sets of printing devices, namely, the printing of the front side is completed on one set of printing device firstly, the printing of the back side is completed on the other set of printing device, the printing uses a plurality of colors, a plurality of printing units are required to be arranged on the corresponding printing devices, and even if the same color is used on the front side and the back side, two printing units are required to be used for coloring, so the equipment cost is increased invisibly. Generally, the printed sheets need to be taken out and loaded again after being printed for one time, and the processes of drying ink and the like are needed in the middle, so that the production time is greatly prolonged.
The prior art generally conveys the sheet to a paper guide plate through a gripper on the front edge of the sheet, and then completes the paper collection through the sliding conveying of the paper guide plate, and a braking device is required to be arranged for decelerating the sheet, but the mode can cause the friction of the dried ink with the paper guide plate and the braking device, thereby affecting the printing quality. Therefore, a device is needed to improve the printing quality and the printing efficiency.
Disclosure of Invention
In order to solve the technical problem, the utility model discloses a following technical scheme can solve:
the utility model provides a two-sided offset printing equipment's sheet flip structure, including set up in the first offset printing roller with the first face contact of printing medium, the driving roller group between the second offset printing roller with the second face contact of printing medium, the driving roller group includes first driving cylinder, second driving cylinder and upset cylinder, the edge mouth all is provided with first gripper around the upset cylinder, first driving cylinder, be equipped with gas blowing device between the second driving cylinder, be equipped with getter device on the second driving cylinder, gas blowing device's the blowing direction and the projection of the center pin of first driving cylinder on vertical, the projection line of the center pin of second driving cylinder on vertical face is perpendicular. In the prior art, grippers on the front edge of a sheet are generally conveyed to a paper delivery device, but a gripper system is respectively used on the front edge and the rear edge, and the grippers naturally decelerate the sheet when the sheet reaches a paper delivery position because the grippers are also arranged on the rear edge, so that the grippers on the rear edge can complete paper delivery.
The blowing device and the suction device are used for fully pressing the sheet material and the second transmission roller, so that the sheet material is conveyed to the turnover roller in a flat manner, and the printing effect is influenced if the sheet material is conveyed in an uneven manner. The blowing direction of the blowing device is perpendicular to a projection connecting line of a central shaft of the first transmission roller on a vertical surface and a projection connecting line of a central shaft of the second transmission roller on the vertical surface, so that the sheet can be smoothly and accurately attached to the second transmission roller, a positioning plate of the side gauge is required to be arranged in front of the first embossing roller to be perpendicular to a positioning line of the front gauge by an accurate 90-degree angle, and the purpose is to improve the printing quality.
Preferably, the second transmission roller is provided with at least one positioning device, and a second gripper is arranged on the positioning device; the tooth sheet of the second gripper is a right-angle tooth sheet. The tooth opening ball of the second gripper is located in the direction of the transmission surface of the turnover structure, and the positioning device is a positioning pin and is arranged at the front edge opening of the gripper bar so as to ensure the accuracy of the mounting position of the gripper bar of the second transmission roller.
Preferably, the suction device is rotatably arranged, and acts on the edge of the sheet and tightly attaches the sheet to the second driving roller. When the printing surface is uneven, the thickness of the wrapping lining of the first transmission roller can be reduced, the tail part of the sheet is more tightly attached to the second transmission roller, meanwhile, the vacuum valve of the suction device increases the suction force, and after the length of the paper is changed, the suction device is rotated to enable the paper to correspond to the suction device.
Preferably, the air blowing device comprises a plurality of air blowing holes, and the air blowing device is correspondingly provided with an adjusting valve and a spring piece. The air blowing hole is positioned on the operation surface, the regulating valve is used for regulating the air blowing quantity, corresponding regulation is made according to the thickness and the hardness of the sheet, and the spring piece is used for blocking the air hole outside the size of the sheet.
Preferably, the axis of the first gripper is located on a pitch circle of the turnover drum gear. The mounting position is accurate in order to ensure that the sheets are kept flat after being transferred to the turnover drum in order that the grippers are completely conveyed flat from the sheets on the second transmission drum, and the shaft center of the first gripper is arranged on the reference circle of the gear of the turnover drum so that the sheets can be smoothly transferred.
Preferably, the surface of the first offset printing roller is wrapped with a cloth wrapping layer. The cloth wrapping layer is used for enabling the sheet to be accurately unfolded in the process of being conveyed between the first offset printing roller and the first conveying roller, and the cloth wrapping layer can adjust the gap between the first offset printing roller and the first conveying roller.
Preferably, the cloth covering layer is a steel plate coated with a resin layer. The purpose is to accelerate the drying speed of the printing ink after the first surface is printed, and meanwhile, the resin layer has an anti-sticking effect, so that the printing effect can be prevented from being influenced by rubbing of the printing ink.
Preferably, the second driving roller has a diameter twice or more as large as that of the first driving roller.
The utility model discloses owing to adopted above technical scheme, have apparent technological effect: the utility model discloses different from traditional big breadth paper collecting device, the sheet is not only carried for paper collecting device through the tooth of gripping on the sheet front edge, but respectively sets up a tooth in the front and back edge, and the sheet can be slowed down when reacing paper collecting device to use another tooth in the jaw to accomplish the paper collection. The innovative design eliminates the need for paper guides and sheet brakes in the delivery of the printing press and avoids scraping of the undried ink against the paper guides and brakes. The printing quality is greatly improved. Furthermore, the size of the printed sheet can be reduced by about 50mm, since no sheet brakes need to be used. In addition, it is also capable of printing products of mixed formats of different imposition sizes. The utility model discloses an other advantages include shorter printing preparation time and higher quality paper pile, when the printing surface unevenness, the suggestion increases the thickness of little first driving drum packing, makes the afterbody of sheet more press close to the suction nozzle of second driving drum, after having increased two-sided printing function, and the efficiency of service equipment is higher, and printing speed can reach more than the triple of printer when the face.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a second driving roller of the present invention.
The names of the parts indicated by the numerical references in the above figures are as follows: the automatic printing machine comprises a first offset printing roller 1, a second offset printing roller 2, a first transmission roller 3, a second transmission roller 4, a turnover roller 5, an air blowing device 6, an air suction device 7 and a second gripper 41.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A sheet turning structure of a double-sided offset printing device is disclosed, as shown in figures 1-2, and comprises a transmission roller group arranged between a first offset printing roller 1 contacted with a first surface of a printing medium and a second offset printing roller 2 contacted with a second surface of the printing medium, wherein the transmission roller group comprises a first transmission roller 3, a second transmission roller 4 and a turning roller 5, the front edge opening and the rear edge opening of the turning roller 5 are provided with first grippers, an air blowing device 6 is arranged between the first transmission roller 3 and the second transmission roller 4, the second transmission roller 4 is provided with an air suction device 7, and the air blowing direction of the air blowing device 6 is vertical to the projection of the central shaft of the first transmission roller 3 on a vertical surface and the projection connecting line of the central shaft of the second transmission roller 4 on the vertical surface. The second transmission roller 4 is at least provided with a positioning device, and a second gripper 41 is arranged on the positioning device; the tooth sheet of the second gripper is a right-angle tooth sheet.
The suction device 7 is rotatably arranged, and the suction device 7 acts on the edge of the sheet and enables the sheet to be tightly attached to the second transmission roller 4.
The blowing device 6 comprises a plurality of blowing holes, and the blowing device 6 is correspondingly provided with an adjusting valve and a spring piece.
The axis of the first gripper is positioned on the reference circle of the gear of the turnover drum 5.
The surface of the first offset printing roller 1 is wrapped with a cloth wrapping layer.
The cloth covering layer is a steel plate coated with a resin layer.
The second transfer drum 4 has a diameter twice or more as large as that of the first transfer drum 3.
In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.
Claims (8)
1. The utility model provides a two-sided offset printing equipment's sheet flip structure, includes the driving roller group that sets up between first offset printing roller (1) with the first face contact of printing medium, the second offset printing roller (2) with the second face contact of printing medium, its characterized in that: the transmission roller group comprises a first transmission roller (3), a second transmission roller (4) and a turnover roller (5), wherein the front edge port and the rear edge port of the turnover roller (5) are provided with first grippers, a blowing device (6) is arranged between the first transmission roller (3) and the second transmission roller (4), the second transmission roller (4) is provided with a suction device (7), the blowing direction of the blowing device (6) is perpendicular to the projection of the central shaft of the first transmission roller (3) on the vertical surface, and the projection connecting line of the central shaft of the second transmission roller (4) on the vertical surface.
2. The sheet reversing structure of a double-sided offset printing apparatus according to claim 1, wherein: the second transmission roller (4) is at least provided with a positioning device, and a second gripper (41) is arranged on the positioning device; the tooth sheet of the second gripper is a right-angle tooth sheet.
3. The sheet reversing structure of a double-sided offset printing apparatus according to claim 1, wherein: the air suction device (7) is rotationally arranged, and the air suction device (7) acts on the edge of the sheet and enables the sheet to be tightly attached to the second transmission roller (4).
4. The sheet reversing structure of a double-sided offset printing apparatus according to claim 1, wherein: the blowing device (6) comprises a plurality of blowing holes, and the blowing device (6) is correspondingly provided with an adjusting valve and a spring piece.
5. The sheet reversing structure of a double-sided offset printing apparatus according to claim 1, wherein: the axle center of the first gripper is positioned on the reference circle of the gear of the turnover drum (5).
6. The sheet reversing structure of a double-sided offset printing apparatus according to claim 1, wherein: the surface of the first offset printing roller (1) is wrapped with a cloth wrapping layer.
7. The sheet reversing structure of a double-sided offset printing apparatus according to claim 6, wherein: the cloth covering layer is a steel plate coated with a resin layer.
8. The sheet reversing structure of a double-sided offset printing apparatus according to claim 1, wherein: the diameter of the second transmission roller (4) is two times or more than that of the first transmission roller (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020956757.9U CN212684973U (en) | 2020-05-31 | 2020-05-31 | Sheet overturning structure of double-sided offset printing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020956757.9U CN212684973U (en) | 2020-05-31 | 2020-05-31 | Sheet overturning structure of double-sided offset printing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212684973U true CN212684973U (en) | 2021-03-12 |
Family
ID=74889433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020956757.9U Active CN212684973U (en) | 2020-05-31 | 2020-05-31 | Sheet overturning structure of double-sided offset printing equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212684973U (en) |
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2020
- 2020-05-31 CN CN202020956757.9U patent/CN212684973U/en active Active
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