Wide offset press

Abstract

The utility model discloses a wide offset press which comprises two side plates which are symmetrically arranged, an ink supply mechanism, a fountain mechanism capable of being movably adjusted, a printing plate roller, a rubber roller capable of being movably adjusted and a printing bottom roller capable of being movably adjusted are installed between the two side plates, and the ink supply mechanism is arranged above the printing plate roller. The output end of the dampening mechanism abuts against the printing plate roller, the rubber roller abuts against the printing plate roller, the printing bottom roller makes contact with the rubber roller, and a plurality of paper transition rollers are installed between the side plates. In this way, the technical effect of high position adjusting efficiency is achieved, and therefore the device can quickly adapt to printing stocks of different materials and thicknesses.

Description

Technical Field

[0001] The utility model relates to printing equipment, in particular to a wide-format offset printing machine. Background Art

[0002] Web-type offset printing press is a type of lithographic printing press. When printing, the printed image is first printed on the rubber cylinder from the printing plate, and then transferred to the paper by the rubber cylinder. According to the number of colors printed in one pass, it can be divided into single-color, two-color, four-color and multi-color printing presses; according to the maximum paper format, it can be divided into small offset printing presses, six-opening, four-opening, double-opening and full-sheet printing presses.

[0003] During the printing process, the web-type wide-format offset printing machine needs to replace the plate roller and adjust the position of the rubber cylinder and the dampening mechanism according to the requirements of the graphics, the material and thickness of the substrate. Such position adjustment is laborious and requires multiple debugging to adjust to the precise position, which brings great delays to production. At the same time, the traditional rubber cylinder includes a rubber plate and a roller. The rubber plate is bonded to the circumferential surface of the roller with glue. Due to the thermal expansion and contraction of the rubber plate during the offset printing process, the glue will soften, and the rubber plate will expand and contract on the roller and leave a gap. This will cause the color of the pattern to deviate after paper feeding, making it difficult to achieve a stable printing effect. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide a wide-format offset printing machine with high position adjustment efficiency and stable pattern printing.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wide-format offset printing machine, comprising two symmetrically arranged side plates, an ink supply mechanism, a movable and adjustable dampening mechanism, a plate roller, a movable and adjustable rubber cylinder and a movable and adjustable printing bottom roller are installed between the two side plates, the ink supply mechanism is arranged above the plate roller, the output end of the dampening mechanism abuts on the plate roller, the rubber cylinder abuts on the plate roller, the printing bottom roller contacts the rubber cylinder, a plurality of paper transition rollers are installed between the side plates, the rubber cylinder comprises a roller and a rubber plate, the rubber plate is wound around It is connected to the roller, a buckle strip is connected to the front end of the rubber sheet, and an insertion strip is connected to the rear end of the rubber sheet. The roller is provided with a clamping groove arranged along its length direction, and an entrance to the clamping groove is arranged on the peripheral wall of the roller. A rotatable pressure rod is arranged in the clamping groove, and a groove for clamping with the buckle strip is arranged on the side wall of the clamping groove. A slot for inserting the insertion strip is arranged on the pressure rod, and one end of the pressure rod extends out of the end of the roller and is provided with a regular hexagonal driving shaft rod, which is rotated by operating an external hexagonal wrench, and a locking mechanism is arranged between the end face of the roller and the pressure rod.

[0006] The locking mechanism includes a swing arm connected to the driving shaft, and the swing arm is connected to a rotatable screw through an inserted shaft. A raised fixing block is provided on the end surface of the drum, and a through hole is provided on the fixing block for the screw to pass through. After the screw passes through the through hole, a locking nut is arranged on the screw.

[0007] The ink supply mechanism includes an ink fountain, an ink fountain roller, an ink transfer roller, an ink stringing roller, an ink evenly distributed roller and an ink form roller. The ink fountain is filled with ink and outputs the ink through the ink fountain roller. The ink transfer roller abuts against the ink fountain roller to transfer and output the ink. The ink transfer roller, the ink stringing roller, the ink evenly distributed roller and the ink form roller contact and conduct the ink in sequence, and the ink form roller abuts against the printing plate roller.

[0008] The dampening mechanism includes a first guide groove arranged on the side plate, a first slide plate is arranged in the first guide groove, a dampening liquid transfer roller and a watering roller are installed between the first slide plates, the dampening liquid transfer roller is in contact with the watering roller, the watering roller is in contact with the printing plate roller, the first slide plate is screwed on a first screw rod, and the first screw rod is connected to the first servo motor in transmission.

[0009] The rubber roller is rotatably mounted on a second slide plate. The side plate is provided with a second guide groove for the second slide plate to slide. The second slide plate is screwed with a second screw rod, which is driven by a second servo motor.

[0010] The printing bottom roller is rotatably mounted on a third slide plate. The side plate is provided with a third guide groove for the third slide plate to slide. The third slide plate is screwed with a third screw rod, which is driven by a third servo motor.

[0011] The structure of the utility model realizes position adjustment of the rubber roller, the printing bottom roller and the dampening mechanism through the movable and adjustable rubber roller, the movable and adjustable printing bottom roller and the movable and adjustable dampening mechanism, so that precise control and adjustment can be performed according to the material and thickness of the substrate, which greatly improves the production efficiency, thus achieving the technical effect of high position adjustment efficiency, thereby quickly adapting to substrates of different materials and thicknesses.

[0012] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional diagram of a specific implementation of the utility model;

[0014] Figure 2 It is a structural diagram of an offset printing device in a specific implementation mode of the utility model;

[0015] Figure 3 It is a three-dimensional diagram of a rubber roller in a specific embodiment of the utility model;

[0016] Figure 4 It is a longitudinal cross-sectional view of the rubber roller in a specific embodiment of the utility model;

[0017] Figure 5 It is a partial stereoscopic diagram of the rubber roller in a specific embodiment of the utility model;

[0018] Figure 6 It is a partial cross-sectional view of the rubber roller in a specific implementation manner of the utility model. DETAILED DESCRIPTION

[0019] The present invention is specifically described below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention.

[0020] like Figure 1 , Figure 2 As shown, this embodiment discloses a wide-format offset printing machine, which is equipped with a feed unwinding rack and a winding rack, one or more offset printing devices are arranged between the feed unwinding rack and the winding rack, the pressure-bearing object is placed on the feed unwinding rack for output and is printed and inked after passing through one or more offset printing devices according to color requirements and finally wound up on the winding rack, the offset printing device comprises two symmetrically arranged side plates 31, an ink supply mechanism 4, a movable and adjustable dampening mechanism 5, a plate roller 6, a movable and adjustable rubber cylinder 7 and a movable and adjustable printing bottom roller 8 are installed between the two side plates 31, the ink supply mechanism 4 is arranged above the plate roller 6, the output end of the dampening mechanism 5 abuts against one side of the plate roller 6, the rubber cylinder 7 abuts against the other side of the plate roller 6, the printing bottom roller 8 is in contact with the rubber cylinder 7, a plurality of paper transition rollers 9 are installed between the side plates 31, and the side plates 31 are fixed on a base 10.

[0021] The ink supply mechanism 4 includes an ink fountain 41, an ink fountain roller 42, an ink transfer roller 43, an ink string roller 44, an ink leveling roller 45 and an ink form roller 46. The ink fountain 41 is filled with ink and is outputted through the ink fountain roller 42. The ink transfer roller 43 abuts against the ink fountain roller 42 to transfer and output the ink. The ink transfer roller 43, the ink string roller 44, the ink leveling roller 45 and the ink form roller 46 are contacted and transmitted in sequence. An ink groove is formed between the ink transfer roller 43 and the ink string roller 44. The ink leveling roller 45 can evenly distribute the ink and evenly output it to the ink form roller. The ink form roller 46 abuts against the printing plate roller 6. Through this structure, the ink in the ink fountain 41 can be stably output and evenly applied to the substrate passing through the printing plate roller 6.

[0022] The dampening mechanism 5 includes a first guide groove provided on the side plate 31, a first slide plate 51 provided in the first guide groove, a dampening liquid conveying roller 52 and a watering roller 53 installed between the first slide plates 51, the dampening liquid conveying roller 52 and the watering roller 53 are in contact with each other, the watering roller 53 is in contact with the printing plate roller 6, the first slide plate 51 is screwed on a first screw rod 54, and the first screw rod 54 is connected to the first servo motor in a transmission manner. This facilitates the change of the interval between the watering roller and the printing plate roller due to the change in the diameter of the printing plate roller after the printing plate roller is replaced, and the first servo motor accurately controls the rotation of the first screw rod 54, thereby pushing the first slide plate 51 to accurately move the watering roller 53 to a reliable position, so that the watering roller 53 and the printing plate roller 6 maintain an appropriate contact pressure, so that the dampening liquid is reliably transmitted to the printing plate roller 6, so that a water film is formed on the blank part of the printing plate of the printing plate roller, and at the same time, the hydrophilic layer damaged during the printing process is supplemented and the surface temperature of the printing plate roller is reduced.

[0023] The rubber roller 7 is rotatably mounted on a second slide plate 71. A second guide groove for the second slide plate 71 to slide is provided on the side plate 31. A second screw rod 72 is screwed on the second slide plate 71. The second screw rod 72 is driven by a second servo motor. Such a structure can drive the rubber roller 7 on the second slide plate 71 to move and adjust the position through the second servo motor, so that the contact pressure between the rubber roller 7 and the plate roller 6 can better conduct the ink reliably on the peripheral wall of the rubber roller 7.

[0024] Among them, Figure 3-Figure 6 As shown, the rubber roller 7 includes a roller 71 and a rubber plate 72, the rubber plate 72 is wound around the roller 71, a buckle strip 721 is connected to the front end of the rubber plate 72, and an insertion strip 722 is connected to the rear end of the rubber plate 72, a clamping groove 73 is arranged along the length direction of the roller 71, an entrance to the clamping groove 73 is arranged on the peripheral wall of the roller 71, a rotatable pressure rod 74 is arranged in the clamping groove 73, a clamping groove 731 that is clamped with the buckle strip 721 is arranged on the side wall of the clamping groove 73, a slot 741 for inserting the insertion strip 722 is arranged on the pressure rod 74, one end of the pressure rod 74 extends out of the end of the roller 71 and is provided with a regular hexagonal driving shaft 742, the driving shaft 742 is rotated by operating an external hexagonal wrench, and a locking mechanism 20 is arranged between the end face of the roller 71 and the pressure rod 74.

[0025] The locking mechanism 20 includes a swing arm 201 connected to the driving shaft 742, and the swing arm 201 is connected to a rotatable screw rod 202 through an insertion shaft. A protruding fixing block 203 is provided on the end surface of the drum 71, and a through hole is provided on the fixing block 203 for the screw rod 202 to pass through. After the screw rod 202 passes through the through hole, a locking nut 204 is arranged on the screw rod 202. In this way, after the pressure rod 74 fixes the head and tail of the rubber plate 72 in the pressing groove 73, the position of the screw rod 202 passing through the fixing block 203 is determined, and the position of the screw rod 202 can be locked by the locking nut 204, which is convenient and reliable to operate.

[0026] By adopting the above technical solution, the buckle strip 721 on the rubber sheet 72 is inserted into the clamping groove 73 from the entrance, and then the pressure rod 74 is rotated. The pressure rod 74 drives the buckle strip 721 to enter the card groove 731. After the insertion strip 722 on the rubber sheet 72 passes through the entrance, it is inserted into the slot 741 on the pressure rod 74 in the clamping groove 73. Then, the pressure rod 74 is rotated to tighten the rubber sheet 72, and then the pressure rod 74 is locked by the locking mechanism 20 to ensure that the rubber sheet 72 remains in a tightened state. The rotation of the pressure rod 74 can be driven by an external hexagonal wrench, thereby avoiding the expansion and contraction changes of the rubber sheet 72 on the roller 71 caused by the softening of the glue, so that the pattern can be printed stably.

[0027] The printing bottom roller 8 is rotatably mounted on a third slide plate 81. The side plate 31 is provided with a third guide groove for the third slide plate 81 to slide. The third screw rod 82 is screwed on the third slide plate 81. The third screw rod 82 is driven by a third servo motor. Through this structure, the third servo motor can accurately drive the printing bottom roller 8 on the third slide plate 81 to adjust the gap between the rubber cylinder 7 and the pressure-bearing object, so that when the printing object passes through the gap, the pattern can be reliably imprinted on the printing object.

[0028] By adopting the above technical scheme, the positions of the rubber roller 7, the printing bottom roller 8 and the dampening mechanism 5 can be adjusted through the movable and adjustable rubber roller 7, the movable and adjustable printing bottom roller 8 and the movable and adjustable dampening mechanism 5, so that precise control and adjustment can be made according to the material and thickness of the substrate, which greatly improves the production efficiency. In this way, the technical effect of high position adjustment efficiency is achieved, so as to quickly adapt to substrates of different materials and thicknesses.

Claims

1. A wide format offset printing machine, comprising two symmetrically arranged side panels, characterized in that: An ink supply mechanism, a movable and adjustable dampening mechanism, a plate roller, a movable and adjustable rubber roller and a movable and adjustable printing bottom roller are installed between the two side plates. The ink supply mechanism is arranged above the plate roller, the output end of the dampening mechanism abuts on the plate roller, the rubber roller abuts on the plate roller, the printing bottom roller contacts the rubber roller, and a plurality of paper transition rollers are installed between the side plates. The rubber roller includes a roller and a rubber plate, the rubber plate is wound around the roller, a buckle strip is connected to the front end of the rubber plate, and a plurality of paper transition rollers are installed between the side plates. The rubber roller includes a roller and a rubber plate, the rubber plate is wound around the roller, a buckle strip is connected to the front end of the rubber plate, and a plurality of paper transition rollers are installed between the side plates. The tail end of the rubber sheet is connected with an insertion strip, the roller is provided with a clamping groove arranged along its length direction, the peripheral wall of the roller is provided with an entrance to the clamping groove, a rotatable pressure rod is provided in the clamping groove, the side wall of the clamping groove is provided with a clamping groove for clamping with the buckle strip, the pressure rod is provided with a slot for inserting the insertion strip, one end of the pressure rod extends out of the end of the roller and is provided with a regular hexagonal driving shaft, the driving shaft is rotated by operating an external hexagonal wrench, and a locking mechanism is arranged between the end face of the roller and the pressure rod.

2. The wide format offset printing machine according to claim 1, characterized in that: The locking mechanism includes a swing arm connected to the driving shaft, and the swing arm is connected to a rotatable screw through an inserted shaft. A raised fixing block is provided on the end surface of the drum, and a through hole is provided on the fixing block for the screw to pass through. After the screw passes through the through hole, a locking nut is arranged on the screw.

3. The wide format offset printing machine according to claim 1, characterized in that: The ink supply mechanism includes an ink fountain, an ink fountain roller, an ink transfer roller, an ink stringing roller, an ink evenly distributed roller and an ink form roller. The ink fountain is filled with ink and outputs the ink through the ink fountain roller. The ink transfer roller abuts against the ink fountain roller to transfer and output the ink. The ink transfer roller, the ink stringing roller, the ink evenly distributed roller and the ink form roller contact and conduct the ink in sequence, and the ink form roller abuts against the printing plate roller.

4. The wide format offset printing machine according to claim 1, characterized in that: The dampening mechanism includes a first guide groove arranged on the side plate, a first slide plate is arranged in the first guide groove, a dampening liquid transfer roller and a watering roller are installed between the first slide plates, the dampening liquid transfer roller is in contact with the watering roller, the watering roller is in contact with the printing plate roller, the first slide plate is screwed on a first screw rod, and the first screw rod is connected to the first servo motor in transmission.

5. The wide format offset printing machine according to claim 1, characterized in that: The rubber roller is rotatably mounted on a second slide plate. The side plate is provided with a second guide groove for the second slide plate to slide. The second slide plate is screwed with a second screw rod, which is driven by a second servo motor.

6. The wide format offset printing machine according to claim 1, characterized in that: The printing bottom roller is rotatably mounted on a third slide plate, the side plate is provided with a third guide groove for the third slide plate to slide, a third screw rod is screwed on the third slide plate, and the third screw rod is driven by a third servo motor.

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