Inking control device for gravure printing machine

Abstract

The inking control device of the gravure printing machine provided by the present invention comprises an embossing roller and a scraper printing carriage arranged on the lower side of the embossing roller on each group of overprint color group units, the scraper printing carriage also comprises a carriage frame, an ink tank, a printing roller and a pump pressure circulation ink supply system, the printing roller is rotatably installed in the ink tank, and transfers the ink on the surface of the roller body to the plate paper between the embossing roller and the printing roller; the pump pressure circulation ink supply system is used to pump the ink in the ink storage box at the bottom of the carriage frame and continuously supply it to the inking area of ​​the printing roller in the ink tank; a touch pressure bubble squeezing mechanism is installed in the inking area of ​​the ink tank, and a scraper mechanism for scraping off excess ink on the printing roller plate is installed in the ink outlet area of ​​the ink tank, the ink on the printing roller plate is evenly distributed through the touch pressure bubble squeezing mechanism, and the plate foam after the printing roller is inked is squeezed, so that the foam on the printing roller plate is effectively removed, the plate defects produced by the printed product are eliminated, and the printing quality is improved.

Description

[Technical field]

[0001] The invention relates to printing equipment, in particular to an inking control device of a gravure printing machine. [Background technology]

[0002] In the prior art, gravure printing machines are widely used because of their high printing speed and ability to overprint multiple color groups. The gravure printing machine includes multiple printing units according to the color group, and each overprint unit includes an impression roller and a printing carriage. The printing carriage can be pushed in and out of each printing unit for color change and maintenance.

[0003] When the printing carriage of each printing unit is working, the ink contained in the gravure pits of the printing roller on the printing carriage is directly pressed onto the substrate through the embossing roller. The shades of the printed picture are determined by the size and depth of the pits. If the pits are deeper, they contain more ink, and the ink layer left on the substrate after printing is thicker; on the contrary, if the pits are shallow, they contain less ink, and the ink layer left on the substrate after printing is thinner.

[0004] However, in the gravure printing process, since the gravure ink is liquid ink and uses a pump pressure circulation ink supply, bubbles are inevitably generated in the process, and the speed of the printing roller for inking is relatively high. The rotation of the printing plate will easily cause the ink in the ink tank to generate bubbles during the rapid inking. After the bubbles burst, they are transferred to the substrate, resulting in large-area or full-page printed products, small spots after UV varnish drying, and poor leveling, resulting in uneven layout after printing, damage to the layout, reduced work efficiency, increased defective rate, and affected economic benefits.

[0005] In particular, with the increasingly stringent environmental protection policies and the continuous improvement of product hygiene and safety requirements, the proportion of water-based inks used has continued to increase, especially the widespread use of water-based snowflake inks and water-based matte inks, which has made the bubble problem more prominent and seriously affected the quality of gravure printing. [Summary of the invention]

[0006] An embodiment of the present invention provides an inking control device for a gravure printing machine, which can adaptively elastically contact and press on the axial surface of a printing roller to eliminate bubbles generated on the printing roller when the ink is quickly inked. It has a simple structure, improves the printing flatness and printing accuracy of the plate, effectively reduces the defective product rate, and improves work efficiency.

[0007] The technical solution adopted in at least one embodiment of the present invention is:

[0008] The inking control device of the gravure printing machine is used for inking each group of overprint color group units on the gravure printing machine, comprising an embossing roller and a scraper printing carriage arranged on the lower side of the embossing roller on each group of overprint color group units, wherein the scraper printing carriage can be pushed out and advanced in each group of overprint color group units; the scraper printing carriage also comprises:

[0009] A small carriage frame is provided with rotatable casters on the bottom side, and the entire carriage body is pushed in or out from the bottom side of the impression roller of each overprinting color group unit under the driving force of an external force;

[0010] An ink tank is located directly below the embossing roller, is cantilevered on the upper side of the trolley frame, and is provided with a bucket-shaped tank body along the axial direction of the embossing roller for accommodating the ink required for inking the overprinting color group unit;

[0011] A printing roller is coaxially arranged with the embossing roller and is located directly below the embossing roller, is rotatably installed in the ink tank, and transfers the ink on the roller surface to the master paper between the embossing roller and the printing roller;

[0012] The pump pressure circulation ink supply system is used to pump the ink in the ink storage box at the bottom of the trolley frame and continuously supply it to the inking area of ​​the printing roller in the ink tank;

[0013] A contact and pressure foam squeezing mechanism is installed in the inking area of ​​the ink tank and is provided along the axial direction of the printing roller to elastically contact and press the surface of the printing roller after adjusting the gap, so as to evenly distribute the ink on the printing roller surface and squeeze the foam on the printing roller surface after the printing roller is inked;

[0014] The scraper mechanism is installed in the ink outlet area of ​​the ink tank and is provided along the axial direction of the printing roller to adjust the gap and then follow the contact pressure on the surface of the printing roller to scrape off the excess ink on the printing roller plate.

[0015] Preferably, the touch-pressure bubble squeezing mechanism comprises a pressing plate, an inking storage plate, at least one or more arc-shaped elastic parts with overlapping ends, a crossbeam and two sets of inking and touch-pressure fine-tuning components, each set of inking and touch-pressure fine-tuning components moves linearly along the radial direction of the printing roller;

[0016] Two sets of inking and touch pressure fine-adjusting components are respectively placed at two ends of the printing roller and fixedly mounted on the rib plates at two ends of the ink tank;

[0017] The horizontal beam is arranged parallel to the axial direction of the printing roller, and its two ends are respectively overlapped and fixed on the inking and touch pressure fine-adjusting components at the two ends of the ink tank, and the inking and touch pressure fine-adjusting components are adjusted on one side or both sides at the same time to drive one end or both ends of the horizontal beam to synchronously approach or move away from the printing roller surface;

[0018] The ink storage plate is an inverted "L"-shaped plate, which is buckled on the horizontal frame beam adjacent to the printing roller side and fixed to the upper side of the horizontal frame beam by a pressure plate connected to the top end. An ink spray cavity is formed between the ink storage plate and the side surface of the horizontal frame beam, which extends through the length direction of the horizontal frame beam and is connected to the ink supply pipe of the pump pressure circulation ink supply system. A plurality of ink nozzles are respectively connected to the ink spray cavity and are evenly distributed along the axial direction of the printing roller on the ink storage plate adjacent to the printing roller side.

[0019] All the arc-surface elastic members are cantileveredly mounted on a horizontal beam at the lower side of the ink nozzle along the axial direction of the printing roller, and the arc surface of the free end of at least the uppermost layer of the arc-surface elastic members elastically contacts the printing plate after the printing roller is inked.

[0020] Preferably, the inking and touch pressure fine-tuning assembly comprises an end support plate, a linear slide rail and a slider, a combined support connection block, a screw, a plurality of sets of mutually matching bearings and gaskets, a fine-tuning positioning plate and a fine-tuning knob, and the end support plate is horizontally mounted on the top of the side end of the ink tank;

[0021] The linear slide rail is perpendicular to the axis direction of the printing roller and is fixedly mounted on the end support plate, and the fine-tuning positioning plate is vertically mounted on the outer end of the end support plate;

[0022] The end of the cross beam is overlapped and fixed on the sliding block through the combined support connecting block;

[0023] One end of the screw is rotatably sleeved and fixed on the fine-tuning positioning plate through a plurality of sets of mutually matching bearings and gaskets, and the fine-tuning knob is fixed on the outer protruding end of the screw, and the other end of the screw is threadedly connected to the combined support connecting block. The external force rotates the fine-tuning knob, drives the cross beam connected to the combined support connecting block, the inking storage plate with ink nozzles, and the arc surface elastic member through the screw, moves along the linear slide direction, approaches the printing roller surface or moves away from the printing roller surface, so as to adjust the inking spacing of the ink nozzles and the contact pressure elastic force of the arc surface elastic member on the printing roller surface.

[0024] Preferably, the single arc-shaped elastic member is an elastic plastic sheet butted end to end to form a long strip-shaped hollow cavity with a self-tensioning arc-shaped elastic surface at the front end.

[0025] Preferably, plastic contact limit plates are respectively provided at both ends of the printing roller for limiting misoperation of the inking and touch pressure fine-tuning components and preventing the inking storage plate at the ink nozzle on the inner side of the cross beam from touching the printing roller surface; an arc-shaped contact surface cooperating with the outer roller surface of the printing roller is provided on the inner side of the plastic contact limit plate.

[0026] Preferably, the pump-pressure circulating ink supply system includes an ink storage box, an ink supply pump, an ink supply tube and a return tube. The ink storage box is installed on the outer side of the lower part of the trolley frame, and a tank cover for adding ink to the box is opened on the top side. The ink supply pump is installed on the top side of the ink storage box and supplies ink to the ink tank through the connected ink supply tube. The bottom side of the ink tank returns the ink after inking the printing roller to the ink storage box through the connected return tube.

[0027] Preferably, the scraper mechanism includes a scraper, a tool holder cross beam and two groups of scraper fine-adjustment components. The scraper is installed on the inner edge of the tool holder cross beam along the axial direction of the printing roller. The two groups of scraper fine-adjustment components are respectively installed at both ends of the ink groove. The two ends of the tool holder cross beam are respectively overlapped and fixed on each group of scraper fine-adjustment components. The two groups of scraper fine-adjustment components are respectively displaced along the radial straight line of the printing roller. The scraper fine-adjustment components are adjusted on one side or both sides at the same time to drive the tool holder cross beam and one end or both ends of the scraper to synchronously approach or move away from the printing roller surface to adjust the ink scraping gap.

[0028] The beneficial effects of at least one embodiment of the present invention are:

[0029] The present invention uses a contact-pressure bubble squeezing mechanism with adjustable spacing to directly supply ink to the printing roller surface through the ink nozzles on the inner side of the cross beam. At the same time, through one or more superimposed arc-shaped elastic parts connected to the lower side of the ink nozzles, the self-tension arc-shaped elastic surface on the front side of the arc-shaped elastic parts is in elastic contact and pressure contact with the printing roller surface to squeeze out the surface foam generated when the printing roller is inking, eliminate the problem of bubbles generated by the ink during rapid inking, evenly distribute the ink on the printing roller surface, eliminate the flower plate defects generated by the printed product, and improve the printing quality.

Brief Description of the Drawings

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the explosion structure of the touch-pressure foam squeezing mechanism of the present invention;

[0032] Figure 3 It is a schematic diagram of a partially enlarged structure of the ink tank without the printing roller in the present invention. [Specific implementation method]

[0033] Ink control device for gravure printing machine, such as Figure 1 and Figure 2As shown, the inking of each group of overprint color group units on the gravure printing machine includes an embossing roller (not shown) and a scraper printing trolley arranged on the lower side of the embossing roller on each group of overprint color group units, and the scraper printing trolley can be pushed out and pushed in each group of overprint color group units; the scraper printing trolley also includes a trolley frame 1, an ink tank 2, a printing roller 3, a pump pressure circulation ink supply system 4, a contact pressure bubble squeezing mechanism 5 and a scraper mechanism 6, wherein the trolley frame 1 is respectively provided with rotating casters 7 at the four corners of the bottom side, and the casters 7 are arranged on the outside. Driven by force, the entire frame is pushed in or out from the lower side of the embossing roller of each group of overprint color group units; the ink tank 2 is located directly below the embossing roller and is cantilevered on the upper side of the small frame 1, and a bucket-shaped tank body is formed along the axial direction of the embossing roller for accommodating the ink required for inking the overprint color group units; the printing roller 3 is coaxially arranged with the embossing roller and located directly below the embossing roller, and is rotatably installed in the ink tank 2, and transfers the ink on the surface of the roller to the plate paper between the embossing roller and the printing roller 3.

[0034] like Figure 1 and Figure 2 As shown, the pump pressure circulation ink supply system 4 is used to pump the ink in the ink storage box 40 at the bottom of the trolley frame 1 and continuously supply it to the inking area of ​​the printing roller 3 in the ink tank 2; the pump pressure circulation ink supply system 4 includes an ink storage box 40, an ink supply pump 41, an ink supply tube 42 and a return tube 43. The ink storage box 40 is installed on the outer side of the lower part of the trolley frame 1, and a storage box cover 44 for adding ink to the box body is opened on the top side. The ink supply pump 41 is installed on the top side of the ink storage box 40 and supplies ink to the ink tank 2 through the connected ink supply tube 42. The bottom side of the ink tank 2 returns the ink after inking the printing roller 3 to the ink storage box 40 through the connected return tube 43.

[0035] like Figure 1 and Figure 2 As shown, the contact and pressure bubble squeezing mechanism 5 is installed in the inking area of ​​the ink tank 2, and is provided along the axial direction of the printing roller 3 with an adjustable gap to elastically contact and press the surface of the printing roller 3, which is used for uniformly distributing the ink on the surface of the printing roller 3 and squeezing the surface foam after the printing roller 3 is inked; the scraper mechanism 6 is installed in the ink outlet area of ​​the ink tank 2, and is provided along the axial direction of the printing roller 3 with an adjustable gap to follow up and press the surface of the printing roller 3, which is used for scraping off excess ink on the surface of the printing roller 3.

[0036] like Figures 1 to 3As shown, the touch-pressure bubble squeezing mechanism 5 includes a pressing plate 50, an inking storage plate 51, two arc-shaped elastic parts 52 with two ends superimposed and connected, a cross beam 53 and two groups of inking and touch-pressure fine-tuning components 54, each group of inking and touch-pressure fine-tuning components 54 is linearly displaced along the radial direction of the printing roller 3, and the arc-shaped elastic parts 52 are elastic plastic sheets that are butt-jointed end to end to form a long strip-shaped hollow cavity with a self-tension arc-shaped elastic surface at the front end; the two groups of inking and touch-pressure fine-tuning components 54 are disposed at both ends of the printing roller 3 and are respectively fixedly mounted on the rib plates 20 at both ends of the ink tank 2; the cross beam 53 is arranged parallel to the axial direction of the printing roller 3, and its two ends are respectively overlapped and fixed on the inking and touch-pressure fine-tuning components 54 at both ends of the ink tank 2; the inking and touch-pressure fine-tuning components 54 are adjusted on one side or both sides at the same time, so as to drive one end or both ends of the cross beam 53 to synchronously approach or move away from the printing roller 3.

[0037] Among them, the ink storage plate 51 is an inverted "L"-shaped plate body, which is buckled on the horizontal frame beam 53 adjacent to the printing roller 3 side and is fixed to the upper side of the horizontal frame beam 53 by the pressure plate 50 connected to the top. An ink spray cavity X is formed between the ink storage plate 51 and the side of the horizontal frame beam 53, which extends through the length direction of the horizontal frame beam 53 and is connected to the ink supply pipe 42 of the pump pressure circulation ink supply system 4. In addition, a plurality of ink nozzles 510 are provided on the ink storage plate 51 adjacent to the printing roller 3, which are respectively connected to the ink spray cavity and uniformly distributed along the axial direction of the printing roller 3; two arc-shaped elastic members 52 are cantilevered along the axial direction of the printing roller 3 on the lower side of the ink nozzle, and the arc surface of the free end of the uppermost arc-shaped elastic member 52 elastically contacts the printing plate surface after the printing roller 3 is inked.

[0038] Continue as Figures 1 to 3As shown, the inking and touch pressure fine-tuning assembly 54 includes an end support plate 540, a linear slide rail and a slider 541, a combined support connection block 542, a screw 543, a plurality of groups of mutually matching bearings 544 and gaskets 545, a fine-tuning positioning plate 546 and a fine-tuning knob 547. The end support plate 540 is horizontally installed on the top of the side end of the ink tank 2; the linear slide rail is perpendicular to the axial direction of the printing roller 3 and is fixed on the end support plate 540, and the fine-tuning positioning plate 546 is vertically installed on the outer end of the end support plate 540; the end of the cross beam 53 is overlapped and fixed on the slider through the combined support connection block 542, and the combined support connection block 542 is two blocks superimposed and connected by a screw assembly. ; Through three groups of mutually matched bearings 544 and four groups of fitted gaskets 545, one end of the screw 543 is rotated and inserted into the fine-tuning positioning plate 546, and the fine-tuning knob 547 is fixed on the outer protruding end of the screw 543; the other end of the screw 543 is threadedly connected to the combined support connecting block 542, and the external force rotates the fine-tuning knob 547, and drives the cross beam 53, the ink storage plate 51 with ink nozzles and the arc spring 52 connected to the combined support connecting block 542 through the screw 543 to move along the direction of the linear slide rail, approaching the printing roller 3 layout or moving away from the printing roller 3 layout, so as to adjust the ink spacing of the ink nozzles and the contact pressure elastic force of the arc spring 52 on the printing roller 3 layout.

[0039] Moreover, if Figures 1 to 3 As shown, plastic contact limit plates 548 are respectively provided at both ends of the printing roller 3 for limiting the misoperation of the inking and touch pressure fine-tuning assembly 54 and preventing the inking storage plate 51 at the ink nozzle on the inner side of the cross beam 53 from touching the surface of the printing roller 3. Correspondingly, an arc-shaped contact surface Y cooperating with the outer roller surface of the printing roller 3 is provided on the inner side of the plastic contact limit plate 548.

[0040] like Figure 1 and Figure 3 As shown, the scraper mechanism 6 includes a scraper 60, a tool holder cross beam 61 and two groups of scraper fine-tuning components 62. The scraper is installed on the inner edge of the tool holder cross beam 61 along the axial direction of the printing roller 3. The two groups of scraper fine-tuning components 62 are installed at both ends of the ink tank 2 respectively. The two ends of the tool holder cross beam 61 are respectively overlapped and fixed on each group of scraper fine-tuning components 62. The two groups of scraper fine-tuning components 62 are respectively displaced along the radial straight line of the printing roller 3. The scraper fine-tuning components 62 are adjusted on one side or both sides at the same time to drive the tool holder cross beam 61 and one end or both ends of the scraper to synchronously approach or move away from the printing roller 3 layout to adjust the ink scraping gap. Among them, the two groups of scraper fine-tuning components 62 and Figure 2 The structure of the inking and touch pressure fine-tuning assembly 54 shown in FIG. 1 is similar and will not be described in detail here.

[0041] In this embodiment, when ink is directly supplied to the printing roller 3 through the contact pressure bubble squeezing mechanism 5 and the scraper mechanism 6, on the one hand, the surface foam generated when the printing roller 3 is inking is squeezed out to eliminate the problem of bubbles generated by the ink during rapid inking; on the other hand, the excess ink on the printing roller 3 is effectively scraped off to achieve uniform distribution of the ink on the printing roller 3, eliminate the pattern defects produced by the printed product, and improve the printing quality.

[0042] The above-described embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes made based on the shape, structure and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An inking control device for a gravure printing machine, used for inking each group of overprint color group units on the gravure printing machine, comprising an embossing roller and a scraper printing carriage arranged on the lower side of the embossing roller on each group of overprint color group units, wherein the scraper printing carriage can be pushed out and advanced in each group of overprint color group units; characterized in that: The doctor blade printing carriage also includes: A small carriage frame is provided with rotatable casters on the bottom side, and the entire carriage body is pushed in or out from the bottom side of the impression roller of each overprinting color group unit under the driving force of an external force; An ink tank is located directly below the embossing roller, is cantilevered on the upper side of the trolley frame, and is provided with a bucket-shaped tank body along the axial direction of the embossing roller for accommodating the ink required for inking the overprinting color group unit; A printing roller is coaxially arranged with the embossing roller and is located directly below the embossing roller, is rotatably installed in the ink tank, and transfers the ink on the roller surface to the master paper between the embossing roller and the printing roller; The pump pressure circulation ink supply system is used to pump the ink in the ink storage box at the bottom of the trolley frame and continuously supply it to the inking area of ​​the printing roller in the ink tank; A contact and pressure foam squeezing mechanism is installed in the inking area of ​​the ink tank and is provided along the axial direction of the printing roller to elastically contact and press the surface of the printing roller after adjusting the gap, so as to evenly distribute the ink on the printing roller surface and squeeze the foam on the printing roller surface after the printing roller is inked; A scraper mechanism is installed in the ink outlet area of ​​the ink tank and is provided along the axial direction of the printing roller to adjust the gap and then follow the pressure on the surface of the printing roller to scrape off excess ink on the printing roller surface; The touch-pressure squeezing mechanism comprises a pressing plate, an inking storage plate, at least one or more arc-shaped elastic parts connected at the ends, a crossbeam and two sets of inking and touch-pressure fine-tuning components, each set of inking and touch-pressure fine-tuning components moves linearly along the radial direction of the printing roller; Two sets of inking and touch pressure fine-adjusting components are respectively placed at two ends of the printing roller and fixedly mounted on the rib plates at two ends of the ink tank; The horizontal beam is arranged parallel to the axial direction of the printing roller, and its two ends are respectively overlapped and fixed on the inking and touch pressure fine-adjusting components at the two ends of the ink tank, and the inking and touch pressure fine-adjusting components are adjusted on one side or both sides at the same time to drive one end or both ends of the horizontal beam to synchronously approach or move away from the printing roller surface; The ink storage plate is an inverted "L"-shaped plate body, the ink storage plate is buckled on the horizontal frame beam adjacent to the printing roller side, and is buckled and fixed to the upper side of the horizontal frame beam by a pressure plate connected to the top end, and an ink spray cavity extending through the length direction of the horizontal frame beam and connected to the ink supply pipe of the pump pressure circulation ink supply system is formed between the ink storage plate and the side of the horizontal frame beam, and a plurality of ink nozzles are opened on the ink storage plate adjacent to the printing roller side, which are respectively connected to the ink spray cavity and evenly distributed along the axial direction of the printing roller; All the arc-surface elastic members are cantileveredly mounted on a horizontal beam at the lower side of the ink nozzle along the axial direction of the printing roller, and the arc surface of the free end of at least the uppermost layer of the arc-surface elastic members elastically contacts the printing plate after the printing roller is inked.

2. The inking control device of the gravure printing machine according to claim 1, characterized in that: The inking and touch pressure fine-tuning assembly includes an end support plate, a linear slide rail and a slider, a combined support connection block, a screw, a plurality of sets of mutually matching bearings and gaskets, a fine-tuning positioning plate and a fine-tuning knob, and the end support plate is horizontally mounted on the top of the side end of the ink tank; The linear slide rail is perpendicular to the axis direction of the printing roller and is fixedly mounted on the end support plate, and the fine-tuning positioning plate is vertically mounted on the outer end of the end support plate; The end of the cross beam is overlapped and fixed on the sliding block through the combined support connecting block; One end of the screw is rotatably sleeved and fixed on the fine-tuning positioning plate through a plurality of sets of mutually matching bearings and gaskets, and the fine-tuning knob is fixed on the outer protruding end of the screw, and the other end of the screw is threadedly connected to the combined support connecting block. The external force rotates the fine-tuning knob, drives the cross beam connected to the combined support connecting block, the inking storage plate with ink nozzles, and the arc surface elastic member through the screw, moves along the linear slide direction, approaches the printing roller surface or moves away from the printing roller surface, so as to adjust the inking spacing of the ink nozzles and the contact pressure elastic force of the arc surface elastic member on the printing roller surface.

3. The inking control device of the gravure printing machine according to claim 1 or 2, characterized in that: The single arc-shaped elastic member is a long strip-shaped hollow cavity with a self-tension arc-shaped elastic surface at the front end formed by connecting the elastic plastic sheets end to end.

4. The inking control device of the gravure printing machine according to claim 1 or 2, characterized in that: Plastic contact limit plates are respectively arranged at both ends of the printing roller to limit the misoperation of the inking and touch pressure fine-tuning components and prevent the inking storage plate at the ink nozzle on the inner side of the cross beam from touching the printing roller surface. An arc-shaped contact surface cooperating with the outer roller surface of the printing roller is arranged on the inner side of the plastic contact limit plate.

5. The inking control device for a gravure printing machine according to claim 1, characterized in that: The pump-pressure circulating ink supply system includes an ink storage box, an ink supply pump, an ink supply tube and a return tube. The ink storage box is installed on the outer side of the lower part of the trolley frame, and a tank cover for adding ink to the box is opened on the top side. The ink supply pump is installed on the top side of the ink storage box and supplies ink to the ink tank through the connected ink supply tube. The bottom side of the ink tank returns the ink after the printing roller is inked to the ink storage box through the connected return tube.

6. The inking control device for a gravure printing machine according to claim 1, characterized in that: The scraper mechanism includes a scraper, a tool holder cross beam and two groups of scraper fine-adjustment components. The scraper is arranged along the axial direction of the printing roller and installed on the inner edge of the tool holder cross beam. The two groups of scraper fine-adjustment components are respectively installed at both ends of the ink groove. The two ends of the tool holder cross beam are respectively overlapped and fixed on each group of scraper fine-adjustment components. The two groups of scraper fine-adjustment components are respectively displaced along the radial straight line of the printing roller. The scraper fine-adjustment components are adjusted on one side or both sides at the same time to drive the tool holder cross beam and one end or both ends of the scraper to synchronously approach or move away from the printing roller surface to adjust the ink scraping gap.

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