A multi-color compound offset printing device

Abstract

The utility model discloses a multicolor composite offset printing device belongs to the field of offset press, including by base, the conveyer belt of conveying printing paper and the rubber roller of printing are composed of multicolor composite offset press. The utility model has the advantages compared with prior art: the device is through pulley and carries out the preliminary traction to the drawing of printing completion, makes the drawing that rolls up complete flat laying through the extrusion of pulley, again through the rectangular sliding slot to the drawing of completing flat laying and draws, guarantees in the area of drying and does not appear the situation of partial bulge, thereby guarantees the uniformity of drying, wherein the slider of pulley has the pressure spring, can guarantee when facing the drawing of different thickness, pulley can press it on the conveyer belt.

Description

Technical Field

[0001] This utility model relates to the field of offset printing machines, specifically to a multi-color composite offset printing device. Background Technology

[0002] In order to quickly print drawings and pictures, people have gradually developed from the most primitive stencil printing and black and white electronic printing to the current multicolor composite offset printing. When dealing with large-area color printing, a multicolor composite offset printing device is usually used. When printing longer drawings, a multicolor composite offset printing machine consisting of a base, a conveyor belt for feeding printing paper, and printing rollers is often used.

[0003] In the existing offset printing machine production process, in order to accelerate the drying speed of ink and ensure that it can be dried in time before winding when processing long roll images, a suitable drying device is usually installed in the printing rear area of ​​the offset printing machine, such as an infrared drying device, an ultraviolet drying device, and an electron beam drying device. Among them, the most commonly used drying device usually uses ultraviolet light for rapid drying.

[0004] During drying, smaller drawings can pass through the gaps under the ultraviolet light normally. However, when printing longer drawings, the edges of the drawings will inevitably curl. If the drawings entering the ultraviolet light are not stretched and flattened, uneven drying or ink on the drawing rubbing against the ultraviolet shell can easily occur during drying, thus affecting the product quality of the drawings. Utility Model Content

[0005] The technical problem this invention aims to solve is that, when producing long drawings, existing multicolor composite offset printing devices are prone to ink layer friction with the UV shell, and uneven drying is also common during the drying process.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a multi-color composite offset printing device, comprising a multi-color composite offset printing machine consisting of a base, a conveyor belt for conveying printing paper, and a printing roller. Behind the output end of the multi-color composite offset printing machine, there are sequentially arranged movable adjusting pressure rollers for pressing the printing paper, a traction chute for restricting the winding of the printing paper, and an auxiliary roller for facilitating the winding of the printing paper. An ultraviolet curing lamp is provided above the traction chute. The ultraviolet curing lamp includes a concave housing fixed to the base by bolts, an ultraviolet lamp plate located in the bottom cavity of the concave housing, and several height adjusting screws located on both sides of the ultraviolet lamp plate. A rectangular chute corresponding to the height adjusting screws is provided on the outer wall of the bottom cavity of the concave housing. The height adjusting screws are connected to the outer wall of the rectangular chute via hexagonal nuts.

[0007] The movable adjusting pressure roller includes a hollow rectangular column welded to the base, a slider located inside the hollow rectangular column, a pressure spring located above the slider, and a pulley passing through the slider and the side of the hollow rectangular column. The top surface of the hollow rectangular column is provided with a cover plate connected by a bolt structure.

[0008] As an improvement, the ultraviolet lamp panel includes a concave lamp panel and a plurality of lamp tubes located in the cavity of the concave lamp panel, and the height adjustment screw is welded to the concave groove sidewall of the concave lamp panel.

[0009] As an improvement, the lowest height of the lamp tube is located inside the concave housing.

[0010] As an improvement, a removable protective housing is provided above the rubber roller to prevent external interference.

[0011] As an improvement, the side cavity of the slider is connected to the shaft of the pulley via a rotary bearing.

[0012] As an improvement, the conveyor belt is a plurality of synchronous conveyor belts, and the rubber rollers are located between the conveyor belts.

[0013] The advantages of this invention compared to the prior art are as follows: This device uses pulleys to initially pull the printed drawings, so that the rolled-up drawings are flattened by the pressure of the pulleys. Then, the flattened drawings are pulled by rectangular chute, ensuring that there are no local bulges in the drying area, thus ensuring the uniformity of drying. The slider where the pulleys are located has a pressure spring, which can ensure that the pulleys can press the drawings of different thicknesses onto the conveyor belt. Attached Figure Description

[0014] Figure 1 This is a general structural diagram of a multicolor composite offset printing device according to the present invention.

[0015] Figure 2 This is a cross-sectional view of the overall structure of a multicolor composite offset printing device according to this utility model.

[0016] Figure 3 This is a cross-sectional view of the movable adjusting pressure roller of a multi-color composite offset printing device according to this utility model.

[0017] Figure 4 This is an exploded view of the ultraviolet curing lamp of a multicolor composite offset printing device according to this utility model.

[0018] As shown in the figure: 1. Multicolor composite offset printing machine; 11. Base; 12. Conveyor belt; 13. Glue roller; 14. Removable protective shell; 2. Movable adjusting pressure roller; 21. Hollow rectangular column; 22. Slider; 23. Pressure spring; 24. Pulley; 25. Cover plate; 3. Traction chute; 4. Auxiliary roller; 5. Ultraviolet curing lamp; 51. Concave shell; 52. Ultraviolet lamp plate; 521. Concave lamp plate; 522. Lamp tube; 53. Height adjusting screw; 54. Rectangular chute. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] As per the instruction manual Figure 1 , 2 As shown in Figures 3 and 4, the existing multicolor composite offset printing machine 1 consists of a base 11, a conveyor belt 12 for conveying printing paper, and a printing roller 13. The printing roller 13 refers to the overall printing structure of the printing paper ink, and the ink contains photosensitive curing agents and other substances to ensure the drying speed of the ink when irradiated by the ultraviolet curing lamp 5. In order to ensure the safety of the printing roller 13 during printing, a detachable protective shell 14 is provided above the printing roller 13 to prevent external interference. The conveyor belt 12 consists of multiple synchronous conveyor belts, and the printing roller 13 is located between the conveyor belts 12. The synchronous operation of the conveyor belts 12 can ensure that the printing paper is not torn during printing. The printing roller 13 and the auxiliary roller 4 appear in pairs.

[0021] To prevent paper curling during the processing of longer drawings, which would affect drying efficiency and quality, the multi-color composite offset printing machine 1 is equipped with a movable adjusting pressure roller 2 for pressing the printing paper, a traction chute 3 for restricting paper winding, and an auxiliary roller 4 for facilitating paper rewinding, all located behind the output end. The movable adjusting pressure roller 2 includes a hollow rectangular column 21 welded to the base 11, a slider 22 located inside the hollow rectangular column 21, a pressure spring 23 above the slider 22, and a pulley 24 passing through the slider 22 and the side of the hollow rectangular column 21. To reduce the rotational friction of the pulley 24, the side cavity of the slider 22 is connected to the shaft of the pulley 24 via a rotary bearing. The top surface of the column 21 is provided with a cover plate 25 connected by a bolt structure; by the downward pressure of the pressure spring 23, the pulley 24 on one side of the slider 22 can always be pressed tightly against the left and right edges of the drawing, regardless of the thickness of the drawing. After flattening the front end of the drawing, the drawing will directly enter the traction groove 3. The traction groove 3 continuously restricts the flatness of the drawing, and finally the front end of the drawing enters the auxiliary roller 4. The auxiliary roller 4 ensures that the drawing will not be scratched by the edge of the base 11 before the drawing is wound. After the drawing enters below the pulley 24, the traction force of the drawing is provided by the winding wheel that winds the drawing. Alternatively, a winding motor can be installed on one side of the auxiliary roller 4 for uniform winding.

[0022] To facilitate adjustment of the irradiation intensity of the ultraviolet curing lamp 5, the ultraviolet curing lamp 5 includes a concave housing 51 fixed to the base 11 by bolts, an ultraviolet lamp plate 52 located in the bottom cavity of the concave housing 51, and several height adjustment screws 53 located on both sides of the ultraviolet lamp plate 52. The outer wall of the bottom cavity of the concave housing 51 is provided with a rectangular groove 54 corresponding to the height adjustment screws 53. The height adjustment screws 53 are connected to the outer wall of the rectangular groove 54 by hexagonal nuts. The height adjustment screws 53 are positioned within the rectangular groove 54... The distance between the ultraviolet lamp plate 52 and the conveyor belt 12 is adjusted by sliding, thereby adjusting the intensity of irradiation. In order to ensure the stability of the ultraviolet lamp plate 52 when adjusting up and down, the ultraviolet lamp plate 52 includes a concave lamp plate 521 and a plurality of lamp tubes 522 located in the cavity of the concave lamp plate 521. The height adjustment screw 53 is welded to the concave groove sidewall of the concave lamp plate 521. The left and right ends of the concave lamp plate 521 are in close contact with the bottom cavity sidewall of the concave housing 51, so as to ensure that there is no left and right height error when the concave lamp plate 521 moves up and down.

[0023] To prevent the lamp tube 522 from touching the drawing due to falling too low, the lowest height of the lamp tube 522 is located inside the concave housing 51.

[0024] In a specific implementation of this invention, the drawing is placed into a multi-color composite offset printing machine 1 for printing. After printing, the front end of the drawing is manually pressed under the pulley 24, and then pulled through the traction groove 3 into the auxiliary roller 4. During the traction process, the ultraviolet curing lamp 5 is turned on to ensure that the ink is dry when entering the auxiliary roller 4. Then the drawing is mounted on the take-up roller to complete the automatic take-up of the drawing. Finally, the motor on the take-up roller is started to pull the drawing at a uniform speed, thereby achieving uniform drying of the drawing before take-up.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A multicolor composite offset printing apparatus, comprising a multicolor composite offset printing machine (1) consisting of a base (11), a conveyor belt (12) for conveying printing paper, and a printing roller (13), characterized in that: The multicolor composite offset printing machine (1) is provided with a movable adjusting pressure roller (2) for pressing the printing paper, a traction chute (3) for restricting the winding of the printing paper, and an auxiliary roller (4) for facilitating the winding of the printing paper behind the output end. An ultraviolet curing lamp (5) is provided above the traction chute (3). The ultraviolet curing lamp (5) includes a concave housing (51) fixed to the base (11) by bolts, an ultraviolet lamp plate (52) located in the bottom cavity of the concave housing (51), and several height adjusting screws (53) located on both sides of the ultraviolet lamp plate (52). The outer wall of the bottom cavity of the concave housing (51) is provided with a rectangular chute (54) corresponding to the height adjusting screw (53). The height adjusting screw (53) is connected to the outer wall of the rectangular chute (54) by a hexagonal nut. The movable adjusting pressure roller (2) includes a hollow rectangular column (21) welded to the base (11), a slider (22) located inside the hollow rectangular column (21), a pressure spring (23) located above the slider (22), and a pulley (24) passing through the slider (22) and the side of the hollow rectangular column (21). The top surface of the hollow rectangular column (21) is provided with a cover plate (25) connected by a bolt structure.

2. The multi-color composite offset printing apparatus according to claim 1, characterized in that: The ultraviolet lamp panel (52) includes a concave lamp panel (521) and a plurality of lamp tubes (522) located in the cavity of the concave lamp panel (521), and the height adjustment screw (53) is welded to the concave groove sidewall of the concave lamp panel (521).

3. The multi-color composite offset printing device according to claim 2, characterized in that: The lowest point of the lamp tube (522) is located inside the concave housing (51).

4. The multi-color composite offset printing apparatus according to claim 1, characterized in that: The rubber roller (13) is provided with a detachable protective housing (14) above it to prevent external interference.

5. The multi-color composite offset printing apparatus according to claim 1, characterized in that: The side cavity of the slider (22) is connected to the shaft of the pulley (24) via a rotary bearing.

6. The multi-color composite offset printing apparatus according to claim 1, characterized in that: The conveyor belt (12) consists of multiple synchronous conveyor belts, and the rubber roller (13) is located between the conveyor belts (12).

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