Swing arm type imprinting rubber roller device of photogravure press

Abstract

A swing arm type imprinting rubber roller device of a photogravure press comprises two vertical plates and an imprinting rubber roller, and is characterized in that L-shaped swing arms are symmetrically hinged to the inner sides of the two vertical plates, seat plates are fixed to the inner sides of one ends of the L-shaped swing arms, a long shaft is arranged between the two seat plates, two supporting discs are symmetrically fixed to the positions, located on the inner sides of the two seat plates, of the long shaft, and the two supporting discs are connected with the L-shaped swing arms. The number of the imprinting rubber rollers is three, the length specifications of rubber surfaces are different, and the imprinting rubber rollers are installed between the two supporting discs. Control air cylinders are hinged to the inner sides of the two vertical plates respectively, and the lower ends of cylinder rods of the control air cylinders are hinged to one ends of the corresponding L-shaped swing arms; positioning air cylinders are arranged on the outer sides of the two base plates respectively, one ends of cylinder rods of the positioning air cylinders penetrate through the base plates and are connected with pins, three positioning holes are evenly distributed in the circumference of the supporting disc, and when the coining rubber roller rotates to be close to the printing plate along with the supporting disc, the pins are inserted into the corresponding positioning holes under the action of the positioning air cylinders. The device has the beneficial effects that the rubber roller is convenient to replace when printing plates with different lengths are replaced, and manpower and cost can be saved.

Description

Technical Field

[0001] This utility model relates to a printing device, and more particularly to a swing arm type impression roller device for a gravure printing machine. Background Technology

[0002] The gravure printing process includes the following steps: The printing plate is partially immersed in an ink bath, and the ink is evenly applied to the plate surface by the circumferential rotation of the plate cylinder; a doctor blade precisely scrapes the plate surface, retaining only the ink within the cells of the gravure printing; subsequently, a pressure roller system applies controlled contact pressure to press the printing medium, such as a plastic film, against the inked plate. During the synchronous operation of the plate cylinder and the pressure roller, the substrate undergoes linear displacement due to mechanical transmission, causing the ink within the cells to be precisely transferred to the printing medium through a contact transfer mechanism, thus forming a monochrome printing layer.

[0003] Modern gravure printing equipment typically features 7-10 independent color modules. Taking the plastic flexible packaging industry as an example, to meet market demands for diverse packaging specifications and complex color representations (usually requiring overprinting of 7-10 colors), each color module requires a dedicated impression roller assembly. The axial length of the printing cylinder must match the packaging specifications, while the effective length of the rubber surface of the matching impression roller must be matched to the corresponding printing plate length as required. This technical characteristic means that during production, every change in product specifications necessitates a simultaneous replacement of the printing cylinder and matching impression roller, significantly increasing equipment calibration time and labor intensity.

[0004] Traditional printing rollers use a single-roller installation structure, requiring the roller to be replaced simultaneously when changing printing plates of different lengths. The roller consists of a metal core, a rubber surface, and bearings at both ends. Its weight varies depending on the model, generally ranging from forty to over one hundred kilograms. Each roller replacement requires disassembly, handling, positioning, and adjustment, necessitating two operators working together. This results in heavy physical labor, high labor intensity, and significant labor costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a gravure printing machine swing arm type printing roller device that makes it easy to change the rubber roller when changing printing plates of different lengths, and can save manpower and costs.

[0006] The technical solution of this utility model is as follows:

[0007] A gravure printing press swing-arm type impression roller device includes two vertical plates of the gravure printing press and impression rollers. Its unique feature is that L-shaped swing arms are symmetrically hinged to the inner sides of the two vertical plates. A base plate is fixed to the inner side of one end of each L-shaped swing arm. A long shaft is provided between the two base plates, and two support discs are symmetrically fixed to the long shaft on the inner sides of the two base plates. There are three impression rollers with different rubber surface lengths, and the rollers are evenly distributed circumferentially and rotatably mounted between the two support discs. Control cylinders are hinged to the inner sides of the two vertical plates above the L-shaped swing arms. The lower end of the cylinder rod of each control cylinder is hinged to one end of the corresponding L-shaped swing arm via a connector, used to control the swing of the two L-shaped swing arms, thereby driving the three impression rollers to swing up and down.

[0008] Positioning cylinders are provided on the outer sides of the two base plates. One end of the cylinder rod of the positioning cylinder passes through the base plate and is connected to a pin. Three positioning holes are evenly distributed around the circumference of the support disc. The three positioning holes correspond one-to-one with the printing roller. When the printing roller rotates with the support disc to the printing plate near the bottom, the pin is inserted into the corresponding positioning hole under the action of the positioning cylinder.

[0009] As a further preferred embodiment, three U-shaped slots are evenly distributed on the inner circumference of the support disc. The two ends of the roller shaft of the printing roller are respectively installed in the U-shaped slots through bearings and limited by pressure blocks. The pressure blocks are inserted into the U-shaped slots and fixed by screws to facilitate the installation of the printing roller.

[0010] As a further preferred option, a positioning pin is provided between one end of the L-shaped swing arm and the seat plate to position the relative positions of the L-shaped swing arm and the seat plate.

[0011] As a further preferred option, a rotatable support roller is installed between the other ends of the two L-shaped swing arms to control the tension of the printing medium when the printing roller swings.

[0012] The beneficial effects of this utility model are:

[0013] 1. Since there are three impression rollers with different rubber surface lengths, the rollers are evenly distributed around the circumference and can be rotatably installed between two support discs. When using the rollers, you only need to make the printing plate according to the three pre-assembled rollers with different rubber surface lengths. When changing the printing plate, the two L-shaped swing arms are controlled by the control cylinder to swing, which drives the three impression rollers to swing upward. The support discs are rotated according to the length of the printing plate, and the rollers that match the printing plate can be switched. This makes it convenient to change the rollers when changing printing plates of different lengths. It can be done by a single person, which saves manpower and costs.

[0014] 2. Positioning cylinders are installed on the outer sides of the two base plates. One end of the cylinder rod of the positioning cylinder is inserted into the positioning holes evenly distributed around the circumference of the support disc through a pin. The three positioning holes correspond one-to-one with the printing roller. Therefore, when the printing roller rotates with the support disc to the printing plate near the bottom, the pin is inserted into the corresponding positioning hole under the action of the positioning cylinder, so that the positioning of the printing roller after replacement can be realized, ensuring stable and reliable operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 yes Figure 1 Rear view.

[0017] Figure 3 yes Figure 1 Top view.

[0018] Figure 4 yes Figure 1 AA sectional view.

[0019] Figure 5 yes Figure 1 BB cross-sectional view.

[0020] Figure 6 This is a three-dimensional structural diagram of the present invention.

[0021] In the diagram: 1. Vertical plate; 2. Short shaft; 3. L-shaped swing arm; 4. Seat plate; 5. Support disc; 6. Control cylinder; 7. Imprint roller; 8. Support roller; 9. Long rod; 10. Pressure cap; 11. Positioning cylinder; 12. Positioning pin; 13. Connector; 14. Pressure block; 15. Long shaft; 16. Bearing; 17. Printing plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] like Figures 1-6As shown, this utility model relates to a swing arm type impression roller device for a gravure printing machine, including two vertical plates 1 and an impression roller 7 of the gravure printing machine. Two L-shaped swing arms 3 are symmetrically hinged to the inner sides of the two vertical plates 1 by short shafts 2 and bearings, respectively. A seat plate 4 is fixed to the inner side of one end of the L-shaped swing arm 3 by screws. The seat plate 4 protrudes from one end of the L-shaped swing arm 3. A long shaft 15 is rotatably installed between the two seat plates 4. The two ends of the long shaft 15 are respectively inserted into U-shaped grooves provided at one end of the seat plate 4 and limited by pressure caps 10 inserted into the U-shaped grooves.

[0024] Two support discs 5 are symmetrically fixed on the long shaft 15 inside the two seat plates 4 by set screws. There are three printing rollers 7 with different glue surface lengths. The three printing rollers 7 are evenly distributed along the circumference and can be rotatably installed between the two support discs 5. Control cylinders 6 are respectively hinged above the L-shaped swing arms 3 on the inner side of the two upright plates 1. The lower end of the cylinder rod of the control cylinder 6 is hinged to one end of the corresponding L-shaped swing arm 3 through the connector 13, which is used to control the swing of the two L-shaped swing arms 3, thereby driving the three printing rollers 7 to swing up and down.

[0025] Positioning cylinders 11 are fixed on the outer side of the two base plates 4 near the other end of the U-shaped groove. One end of the cylinder rod of the positioning cylinder 11 passes through the base plate 4 and is connected to a pin. Three positioning holes 501 are evenly distributed around the circumference of the support disc 5. The three positioning holes 501 correspond one-to-one with the printing roller 7. When the printing roller 7 rotates with the support disc 5 to the printing plate 17 near the bottom, the pin is inserted into the corresponding positioning hole 501 under the action of the positioning cylinder 11.

[0026] Three U-shaped slots are evenly distributed on the inner circumference of the support disc 5. The two ends of the roller shaft of the printing roller 7 are respectively installed in the corresponding U-shaped slots through bearings 16 and limited by pressure blocks 14. The pressure blocks 14 are inserted into the U-shaped slots and fixed by screws to facilitate the installation of the printing roller 7.

[0027] A positioning pin 12 is provided between one end of the L-shaped swing arm 3 and the seat plate 4 to position the relative positions of the L-shaped swing arm 3 and the seat plate 4.

[0028] A long rod 9 is fixed between the other ends of the two L-shaped swing arms 3. A rotatable roller 8 is mounted on the long rod 9 via bearings to control the tension of the printing medium when the printing roller swings.

[0029] During operation, the printing medium passes between the device and the printing plate 17 below, and is then passed around by the support roller 8. During printing, two control cylinders 6 extend simultaneously, causing the L-shaped swing arms 3 and three impression rollers 7 to swing downwards around their short axes and press against the printing plate 17 below, driving the printing plate 17 to rotate for printing. When changing printing plates, the control cylinders 6 control the two L-shaped swing arms 3 to swing, causing the three impression rollers 7 to swing upwards away from the printing plate. The support disc 5 rotates according to the printing plate length, allowing the use of the impression roller 7 that matches the printing plate. When the required impression roller 7 rotates with the support disc 5 to a position close to the printing plate below, the positioning cylinder 11 extends, causing a pin to insert into the corresponding positioning hole 501, thus achieving the positioning of the replaced impression roller 7.

[0030] After replacement, re-control the extension of cylinder 6 and press the replaced printing roller 7 onto the printing plate below to continue working.

[0031] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A swing arm impression roller assembly for a gravure printing press, comprising two uprights of the gravure printing press and an impression roller, characterised in that: Two L-shaped swing arms are symmetrically hinged on the inner sides of the two vertical plates, a seat plate is fixed on the inner side of one end of the L-shaped swing arm, a long shaft is arranged between the two seat plates, two support discs are symmetrically fixed on the long shaft on the inner sides of the two seat plates, the three impression rubber rollers with different rubber surface lengths are rotatably arranged between the two support discs; a control air cylinder is hinged on the inner side of each vertical plate above the L-shaped swing arm, the lower end of the cylinder rod of the control air cylinder is hinged to one end of the corresponding L-shaped swing arm through a connecting head, for controlling the swing of the two L-shaped swing arms, so as to drive the up-and-down swing of the three impression rubber rollers; A positioning air cylinder is arranged on the outer side of each seat plate, one end of the cylinder rod of the positioning air cylinder penetrates through the seat plate and is connected with a pin, three positioning holes are uniformly distributed on the circumference of the support disc, the three positioning holes correspond to the three impression rubber rollers one by one, when the impression rubber roller rotates with the support disc to be close to the lower printing plate, the pin is inserted into the corresponding positioning hole under the action of the positioning air cylinder.

2. The gravure printing machine swing arm impression roller device according to claim 1, characterized in that: Three U-shaped clamping grooves are uniformly distributed on the inner side of the support disc, the roller shafts of the impression rubber rollers are respectively installed in the U-shaped clamping grooves through bearings and are limited by pressing blocks, the pressing blocks are inserted into the U-shaped clamping grooves and are fixed through screws, so as to facilitate the installation of the impression rubber rollers.

3. The gravure printing machine swing arm impression roller device according to claim 1, characterized in that: A positioning pin is arranged between one end of the L-shaped swing arm and the seat plate, for positioning the relative positions between the L-shaped swing arm and the seat plate.

4. The offset printing machine swing arm impression roller device according to any one of claims 1 to 3, characterized in that A rotatable supporting roller is installed between the other ends of the two L-shaped swing arms, for controlling the tension of the printing medium when the impression rubber roller swings.

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