An offset printing machine ink transfer and uniformity system and offset printing machine

Abstract

The present application provides a kind of offset press ink transfer and ink uniformity system and offset press, ink transfer and ink uniformity system includes: ink roller, ink taking roller, first ink string roller, transition roller, second ink string roller, ink transfer rubber roller, magnetic roller and printing roller in turn contact and drive, printing roller can drive ink roller, ink taking roller, transition roller, ink transfer rubber roller and magnetic roller when rotating, printing roller can also drive first ink string roller and second ink string roller rotate and reciprocate along axial direction when rotating.Compared with traditional structure, in the case where the number of rollers does not change in limited space, an action of rubbing ink is added, so that the ink transfer and ink uniformity effect is better, and the printing quality is improved.

Description

An ink transfer and distribution system for an offset printing machine and the offset printing machine itself. Technical Field

[0001] This invention belongs to the field of printing machinery technology, and more specifically, relates to an ink transfer and ink distribution system for an offset printing machine and an offset printing machine. Background Technology

[0002] In existing offset printing press technology, the design of the inking system directly affects print quality and machine operating efficiency. However, existing inking systems suffer from several problems that urgently need to be addressed. First, their structural design often results in uneven ink distribution, leading to a decline in print quality. Second, some manufacturers report ink leakage during actual use, making cleaning up the leaked ink a burden for operators. Finally, the components that enable the clutch function of the inking rollers are difficult to machine, resulting in high manufacturing and maintenance costs. As the printing industry pursues high-efficiency, low-cost, and environmentally friendly printing, the limitations of existing inking systems are becoming increasingly apparent, necessitating a new inking system design that can reduce costs and improve stability and durability. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an offset printing press ink transfer and uniformity system and an offset printing press, thereby solving the problem of uneven ink distribution in existing ink transfer and uniformity systems.

[0004] To achieve the above objectives, in a first aspect, the present invention provides an offset printing press ink transfer and distribution system, comprising:

[0005] The ink roller, ink take-up roller, first string of ink rollers, transition roller, second string of ink rollers, ink transfer rubber roller, magnetic roller and printing roller are sequentially contacted and driven. When the printing roller rotates, it can drive the ink roller, the ink take-up roller, the transition roller, the ink transfer rubber roller and the magnetic roller to rotate. When the printing roller rotates, it can also drive the first string of ink rollers and the second string of ink rollers to rotate and reciprocate along the axial direction.

[0006] The ink roller, the ink collection roller, the first string of ink rollers, the transition roller, the second string of ink rollers, and the ink transfer rubber roller are all installed between the rear wall panel and the front wall panel, which are arranged opposite to each other.

[0007] A support component on which the magnetic roller and the printing roller are rotatably mounted.

[0008] Optionally, the first string of ink rollers and the second string of ink rollers have the same structure, both including:

[0009] A non-rotatable ink-guiding steel roller shaft is connected between the rear wall panel and the front wall panel;

[0010] The ink-guiding steel roller sleeve is movably sleeved outside the ink-guiding steel roller shaft;

[0011] The figure-eight oil groove is provided on the outer surface of the ink-conducting steel roller shaft;

[0012] Keyway, the keyway is provided on the inner surface of the ink-conducting steel roller sleeve;

[0013] The fork pin has one end embedded in the keyway and the other end embedded in the figure-eight oil groove.

[0014] Optionally, the inner sides of the rear wall panel and the front wall panel are provided with a pair of first sliding grooves and a pair of second sliding grooves that are inclined downwards;

[0015] The first set of ink rollers has a pair of first sliders at both ends, and the pair of first sliders are slidably disposed in a pair of first grooves;

[0016] The second set of ink rollers has a pair of second sliders at both ends, and the pair of second sliders are slidably disposed in a pair of second grooves;

[0017] The transition roller is provided with a pair of third sliders at both ends, and the pair of third sliders are slidably disposed in a pair of second grooves and located above the second sliders.

[0018] In a second aspect, the present invention provides an offset printing machine, comprising:

[0019] The offset printing press ink transfer and uniform ink system described in the first aspect;

[0020] An ink cartridge, which is mounted on the ink roller, is used to supply ink to the surface of the ink roller;

[0021] A driving component, connected to the printing roller, is used to drive the printing roller to rotate;

[0022] The gearbox, wherein the ink transfer roller and the ink roller are connected by transmission through the gearbox;

[0023] A first gear is disposed at one end of the printing roller;

[0024] A second gear is disposed at one end of the magnetic roller and meshes with the first gear;

[0025] The third gear is disposed at one end of the ink transfer roller and meshes with the second gear;

[0026] A clutch assembly is connected to the ink transfer roller and is used to control the engagement and disengagement of the ink transfer roller and the printing roller.

[0027] Optionally, the ink roller includes:

[0028] The ink roller shaft is rotatably connected between the rear wall plate and the front wall plate. The ink roller shaft is a stepped shaft, and the diameter of the middle part of the ink roller shaft is larger than the diameter of the two ends. The middle part of the ink roller shaft is used for ink transfer.

[0029] A pair of ink roller sleeves, wherein the pair of ink roller sleeves are rotatably sleeved at both ends of the ink roller shaft;

[0030] A pair of retaining plates are used to fix the pair of ink roller retainers to the rear wall panel and the front wall panel.

[0031] Optionally, each of the pair of ink roller sleeves is provided with a flat portion that slopes downward from the side closest to the ink cartridge to the other side;

[0032] The ink cartridge includes:

[0033] A pair of ink roller bushings, wherein the ink roller bushings are disposed between the ink roller sleeve and the middle part of the ink roller shaft body;

[0034] A pair of O-rings, wherein the O-rings are disposed between the middle part of the ink roller bushing and the ink roller shaft;

[0035] A pair of ink cartridge side plates, wherein the ink cartridge side plates are provided with C-shaped openings that mate with the flat part, and the ink cartridge side plates can be installed on the flat part through the C-shaped openings and fit against the side of the ink roller bushing;

[0036] The ink cartridge body is connected between a pair of ink cartridge side plates, and the side of the wiper blade of the ink cartridge body is attached to the ink cartridge side plate.

[0037] A pair of limiting plates, one end of which is connected to the bottom of the sleeve fixing plate, and the other end of which corresponds to the bottom position of the sleeve fixing plate.

[0038] Optionally, the ink cartridge includes:

[0039] A pair of adjusting bases, wherein the adjusting bases are detachably connected to the retaining plate;

[0040] The ink cartridge body is connected between a pair of adjustment bases.

[0041] A pair of ink cartridge side plates, wherein the ink cartridge side plates are provided with arc grooves that match the middle part of the ink roller shaft;

[0042] Several first anti-leakage screws, the first anti-leakage screws being perpendicular to the ink roller shaft and passing through the adjusting base and contacting the ink cartridge side plate, are used to provide a first clamping force so that the arc groove of the ink cartridge side plate fits against the middle of the ink roller shaft;

[0043] Several second anti-leakage screws are provided, which are parallel to the ink roller shaft and pass through the adjusting base to contact the ink cartridge side plate, and are used to provide a second clamping force so that the side of the ink cartridge side plate is in contact with the side of the wiper blade of the ink cartridge body.

[0044] Optionally, the clutch assembly includes:

[0045] A clutch plate, one end of which is rotatably connected to the outside of the front wall plate, and the other end of the ink transfer roller passes through the front wall plate and is rotatably connected to the middle of the clutch plate. The other end of the clutch plate is provided with a first upper inclined surface and a first lower inclined surface.

[0046] A limiting component is fixedly disposed on the front wall panel and positioned corresponding to the clutch plate, for limiting the clutch plate from rotating toward the magnetic roller;

[0047] A clutch pressure plate, one end of which is rotatably connected to the outside of the front wall panel, and the other end of which is provided with a second upper inclined surface and a second lower inclined surface. The second lower inclined surface is used to contact the first upper inclined surface to keep the clutch plate in contact with the limiting component, and the second upper inclined surface is used to contact the first lower inclined surface to keep the clutch plate and the limiting component in a closed-loop manner.

[0048] An elastic component is fixedly disposed on the front wall panel and connected to the clutch pressure plate, and is used to provide a restoring force to the clutch pressure plate so that the second lower inclined surface keeps in contact with the first upper inclined surface or keeps the second upper inclined surface in contact with the first lower inclined surface.

[0049] Optionally, the clutch assembly further includes:

[0050] A clutch lever, wherein the clutch lever is disposed on the clutch plate;

[0051] A pressure plate handle is provided on the clutch pressure plate.

[0052] Optionally, the limiting component includes:

[0053] A pressure adjusting screw seat is fixedly installed on the front wall panel;

[0054] The pressure adjusting screw passes through the pressure adjusting screw seat and corresponds to the first limiting face. The pressure adjusting screw can adjust the extension length.

[0055] The beneficial effects of this invention are as follows: It provides an offset printing press ink transfer and even ink distribution system, comprising: an ink roller, an ink take-up roller, a first set of ink rollers, a transition roller, a second set of ink rollers, an ink transfer rubber roller, a magnetic roller, and a printing roller that are sequentially contacted and driven. When the printing roller rotates, it can drive the ink roller, the ink take-up roller, the transition roller, the ink transfer rubber roller, and the magnetic roller to rotate only. When the printing roller rotates, it can also drive the first set of ink rollers and the second set of ink rollers to rotate and reciprocate along the axial direction. Compared with the traditional structure, an ink-eventing action is added within a limited space while keeping the number of rollers the same, resulting in better ink transfer and even ink distribution and improved printing quality.

[0056] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0057] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0058] Figure 1 shows one of the schematic structural diagrams of the offset printing press ink transfer and uniform ink system according to Embodiment 1 of the present invention.

[0059] Figure 2 shows a second schematic structural diagram of the offset printing press ink transfer and uniform ink system according to Embodiment 1 of the present invention.

[0060] Figure 3 shows a schematic structural diagram of the first string of ink rollers according to Embodiment 1 of the present invention.

[0061] Figure 4 shows a partial schematic structural diagram of the offset printing press ink transfer and uniform ink system according to Embodiment 1 of the present invention.

[0062] Figure 5 shows one of the schematic structural diagrams of an ink cartridge according to Embodiment 1 of the present invention.

[0063] Figure 6 shows a second schematic structural diagram of an ink cartridge according to Embodiment 1 of the present invention.

[0064] Figure 7 shows the DD cross-sectional view of Figure 6.

[0065] Figure 8 shows the FF cross-sectional view of Figure 6.

[0066] Figure 9 shows one of the schematic structural diagrams of the clutch assembly according to Embodiment 1 of the present invention.

[0067] Figure 10 shows a schematic diagram of the engagement state of the clutch assembly according to Embodiment 1 of the present invention.

[0068] Figure 11 shows a schematic diagram of the clutch assembly in the disengaged state according to Embodiment 1 of the present invention.

[0069] Figure 12 shows a schematic structural diagram of an ink cartridge according to Embodiment 2 of the present invention.

[0070] Figure 13 shows a second schematic structural diagram of an ink cartridge according to Embodiment 2 of the present invention.

[0071] Figure 14 shows the GG cross-sectional view of Figure 13.

[0072] Figure 15 shows a schematic structural diagram of the ink transfer and distribution system of a prior art offset printing press.

[0073] Explanation of reference numerals in prior art:

[0074] a' Ink cartridge; b' Ink roller; c' Ink take-up roller; d' Transition roller; e' Ink transfer roller; f' Transition roller; g' Ink transfer roller; h' Magnetic roller; i' Printing roller; j' Substrate; k' Ink; m' Gearbox.

[0075] Explanation of reference numerals in the embodiments of the present invention:

[0076] a. Ink cartridge; a1. Ink cartridge side plate; a2. Ink roller bushing; a3. Squeegee pressure plate; a4. Ink cartridge connecting plate; a5. Adjusting screw seat; a6. Adjusting screw; a7. Squeegee; a8. Anti-loosening spring; a9. O-ring seal; a10. C-shaped opening; a11. Limiting plate; a12. Removable base plate; a13. Longitudinal adjustment support plate; a14. Transverse adjustment support plate; a15. First leak-proof screw; a16. Arc groove; a17. Second leak-proof screw;

[0077] b. Ink roller; b1. Ink roller shaft; b2. Ink roller sleeve; b3. Sleeve fixing plate; b4. Flat part;

[0078] c. Ink roller;

[0079] d, First ink roller; d2, Ink roller shaft; d3, Figure-eight oil groove; d4, Bushing; d5, Fork pin; d6, Ink roller sleeve;

[0080] e. Transition roller;

[0081] f. The second set of ink rollers;

[0082] g, ink transfer roller; g1, third gear;

[0083] h, magnetic roller; h1, second gear;

[0084] i. Printing roller; i1. First gear;

[0085] k. Ink;

[0086] m, gearbox,

[0087] n, clutch assembly; n1, clutch plate; n2, clutch pressure plate; n3, spring seat; n4, spring; n5, clutch handle; n6, pressure adjusting screw seat; n7, pressure adjusting screw; n8, stop screw; n9, clutch pulley; n10, pressure plate handle;

[0088] p, rear wall panel; p1, first sliding groove; p2, second sliding groove;

[0089] q. Front wall panel;

[0090] r1 is the first slider, r2 is the second slider, and r3 is the third slider. Detailed Implementation

[0091] In the prior art, the structure of the original roller ink transfer and uniform ink system is shown in Figure 15. The arrows indicate the direction of movement. a' is the ink cartridge, b' is the ink roller (steel), c' is the ink collection roller (rubber), d' is the transition roller (steel), e' is the ink transfer roller (rubber), f' is the transition roller (steel), g' is the ink transfer rubber roller, h' is the magnetic roller with a magnetic resin plate, i' is the printing roller with a rubber blanket, j' is the printing substrate, k' is the ink, and m' is the gearbox.

[0092] The printing ink path is as follows: ink k' is transferred to the magnetic resin plate on the surface of magnetic roller h' through the ink transfer and uniform ink system. The resin plate is composed of a 0.5mm iron plate and 0.2~0.3mm resin. The resin part is the embossed pattern. The ink is transferred to the rubber blanket evenly distributed on the surface of printing roller i through the resin plate. The pattern is then transferred to the substrate through the rubber blanket.

[0093] The motion constraints of each roller are as follows: Ink roller b', transition roller d', transition roller f', ink transfer roller g', magnetic roller h', and printing roller i' all rotate only around their axes, their function being to transfer ink to the substrate step by step. Ink transfer roller e' rotates around its axis while simultaneously performing axial reciprocating motion, transferring ink and also spreading it evenly. Ink take-up roller c' rotates around its axis while periodically swaying left and right, that is, periodically contacting transition roller d' and ink roller b'.

[0094] The transmission relationship of each roller is as follows: Printing roller i' acts as the driving wheel in this ink transfer and equalization system. Power is transmitted to magnetic roller h' through an end gear. Magnetic roller h' then transmits power to ink transfer roller g' through the end gear. The power of ink transfer roller g' is transmitted to ink roller b' through a synchronous pulley and belt, a gearbox m', and a flexible coupling. Simultaneously, ink transfer roller g' and transition roller f' experience rotational friction, causing transition roller f' to rotate around its axis. Correspondingly, e', d', and c' also rotate due to rotational friction. It is worth mentioning that ink take-up roller c periodically oscillates left and right, meaning that the power is periodically provided by frictional power from transition roller d' and ink roller b' to rotate around its axis.

[0095] This invention aims to solve the aforementioned problems in the prior art by achieving better ink distribution and uniformity in the ink transfer system through innovative design, reducing manufacturing and maintenance costs, resolving ink leakage issues, and optimizing the clutch components. The implementation of this invention will not only improve the overall performance of printing presses but also meet the market demand for efficient, economical, and environmentally friendly printing equipment, possessing significant practical value and broad market prospects.

[0096] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0097] Example 1

[0098] As shown in Figures 1 and 2, this embodiment provides an offset printing press ink transfer and distribution system, including:

[0099] The ink roller b, ink take-up roller c, first set of ink rollers d, transition roller e, second set of ink rollers f, ink transfer rubber roller g, magnetic roller h, and printing roller i are sequentially contacted and driven. When the printing roller i rotates, it can drive the ink roller b, ink take-up roller c, transition roller e, ink transfer rubber roller g, and magnetic roller h to rotate. When the printing roller i rotates, it can also drive the first set of ink rollers d and the second set of ink rollers f to rotate and reciprocate along the axial direction.

[0100] The ink roller b, ink take-up roller c, first set of ink rollers d, transition roller e, second set of ink rollers f and ink transfer rubber roller g are installed between the rear wall plate p and the front wall plate q, which are set opposite to each other.

[0101] A support component (not shown in the figure) is provided on which the magnetic roller h and the printing roller i are rotatably mounted.

[0102] Specifically, this ink transfer and distribution system, adhering to the principle of alternating steel and rubber rollers, optimizes the traditional single ink roller into two. The transition rubber roller e is configured to rotate only around its axis, its function being to transfer ink k. The first ink roller d and the second ink roller f are configured to rotate around their axis while simultaneously reciprocating along the axial direction, transferring ink k while also uniformly distributing it. Compared to the traditional structure, this system adds an ink-distributing action (k-mixing) within a limited space while maintaining the same number of rollers, resulting in superior ink transfer and distribution performance.

[0103] Optionally, as shown in Figure 3, the first string of ink rollers d and the second string of ink rollers f have the same structure, both including:

[0104] The ink-guiding steel roller shaft d2 is non-rotatably connected between the rear wall panel p and the front wall panel q.

[0105] The ink-guiding steel roller sleeve d6 is movably sleeved outside the ink-guiding steel roller shaft d2.

[0106] The figure-eight oil groove d3 is located on the outer surface of the ink-conducting steel roller shaft d2.

[0107] Keyway, the keyway is located on the inner surface of the ink-conducting steel roller sleeve d6;

[0108] The fork pin d5 has one end embedded in the keyway and the other end embedded in the figure-eight oil groove d3.

[0109] In this embodiment, the "figure-eight oil groove" is a prior art structure, including a forward spiral groove and a reverse spiral groove. The forward spiral groove and the reverse spiral groove are connected end to end and the connection is smoothly transitioned. The ink-spreading steel roller shaft d2 has two sections of figure-eight oil grooves d3 as guide grooves, one of which is a spare. That is, when the other guide groove wears out, the ink-spreading steel roller shaft d2 can be reversed and assembled to extend the service life of the shaft. The boss of the fork pin d5 is engaged in the figure-eight oil groove d3, and at the same time, the round head of the fork pin d5 is engaged in the keyway of the ink-spreading steel roller sleeve d6. When the ink-spreading steel roller sleeve d6 is subjected to the rolling friction of the previous set of rollers, it rotates around the shaft. At the same time, under the guidance of the fork pin d5 and the figure-eight oil groove d3, it performs axial reciprocating motion to achieve the uniform mixing of ink. A bushing d4 is provided between the ink-guiding steel roller sleeve d6 and the ink-guiding steel roller shaft d2. In the traditional design, the bushing d4 is made of copper. After 7-10 days of continuous operation (24 hours a day), the copper powder produced by the wear of the copper bushing d4 mixes with the lubricating grease to form sludge, which blocks the figure-eight oil groove d3 of the ink-guiding steel roller shaft d2, hindering the movement of the fork pin d5, thus causing the ink-guiding roller to jam and fail. In this embodiment, the material of the bushing d4 is changed to Teflon, which has the characteristics of low coefficient of friction, high temperature resistance, and self-lubrication. This solves the problem of ink-guiding roller jamming during use, significantly increases the service life to several months, and reduces maintenance costs.

[0110] Optionally, as shown in Figures 1 and 4, the inner sides of the rear wall panel p and the front wall panel q are provided with a pair of first sliding grooves p1 and a pair of second sliding grooves p2 that are cut downwards at an angle;

[0111] The first ink roller d has a pair of first sliders r1 at both ends, and the pair of first sliders r1 are slidably disposed in a pair of first grooves p1;

[0112] The two ends of the second ink roller f are provided with a pair of second sliders r2, and the pair of second sliders r2 are slidably disposed in a pair of second grooves p2;

[0113] The transition roller e has a pair of third sliders r3 at both ends. The pair of third sliders r3 are slidably disposed in a pair of second grooves p2 and located above the second sliders r2.

[0114] Specifically, the slider and the shaft of each roller are fixed. The slider is installed into the groove from top to bottom. The first set of ink rollers d, the transition roller e and the second set of ink rollers f rely on their own gravity to press down layer by layer. Even if the rubber rollers are worn, they will still contact each other and have a certain degree of self-adaptability. The steel bushings or rubber-coated bushings of each roller rotate around the shaft.

[0115] As shown in Figures 1 and 5-8, this embodiment also provides an offset printing machine, including:

[0116] The offset printing press ink transfer and uniform ink system in this embodiment;

[0117] Ink cartridge a, which is installed on ink roller b, is used to supply ink k to the surface of ink roller b;

[0118] A drive component (not shown in the figure) is connected to the printing roller i and is used to drive the printing roller i to rotate.

[0119] The gearbox m, the ink transfer roller g and the ink roller b are connected by the gearbox m;

[0120] The first gear i1 is disposed at one end of the printing roller i;

[0121] The second gear h1 is disposed at one end of the magnetic roller h and meshes with the first gear i1;

[0122] The third gear g1 is located at one end of the ink transfer roller g and meshes with the second gear h1.

[0123] Clutch assembly n is connected to ink transfer roller g and is used to control the engagement / disengagement action between ink transfer roller g and printing roller i.

[0124] Optionally, ink roller b includes:

[0125] The ink roller shaft b1 is rotatably connected between the rear wall plate p and the front wall plate q. The ink roller shaft b1 is a stepped shaft, and the diameter of the middle part of the ink roller shaft b1 is larger than the diameter of both ends. The middle part of the ink roller shaft b1 is used for ink transfer.

[0126] A pair of ink roller sleeves b2 are rotatably fitted onto both ends of the ink roller shaft b1;

[0127] A pair of clamping plates b3 and a pair of ink roller clamping plates b2 are fixedly installed on the rear wall plate p and the front wall plate q through the pair of clamping plates b3.

[0128] Optionally, each pair of ink roller sleeves b2 is provided with a flat position b4 that slopes downward from the side closest to the ink cartridge a to the other side;

[0129] Ink cartridge a includes:

[0130] A pair of ink roller bushings a2, the ink roller bushings a2 being disposed between the ink roller sleeve b2 and the middle of the ink roller shaft b1;

[0131] A pair of O-rings a9 are provided, which are located between the middle of the ink roller bushing a2 and the ink roller shaft b1.

[0132] A pair of ink cartridge side plates a1, each ink cartridge side plate a1 having a C-shaped opening a10 that mates with a flat part b4. The ink cartridge side plate a1 can be installed on the flat part b4 through the C-shaped opening a10 and fit against the side of the ink roller bushing a2.

[0133] The ink cartridge body is connected between a pair of ink cartridge side plates a1, and the side of the wiper blade a7 of the ink cartridge body is attached to the ink cartridge side plate a1.

[0134] A pair of limiting plates a11, one end of which is connected to the bottom of the sleeve fixing plate b3, and the other end of which corresponds to the bottom position of the sleeve fixing plate b3.

[0135] In this embodiment, the ink cartridge body adopts an existing structure, including: a scraper plate a3, an ink cartridge connecting plate a4, an adjusting screw seat a5, an adjusting screw a6, a scraper a7, and an anti-loosening spring a8. The ink cartridge side plate a1 and the ink cartridge connecting plate a4, as well as the ink cartridge side plate a1 and the adjusting screw seat a5, are connected by screws to form the overall frame of the ink cartridge. An O-ring a9 acts as a spring washer between the ink roller bushing a2 and the ink roller shaft b1. After assembling the ink cartridge frame, the ink cartridge side plate a1 is inserted into the flat part b4 of the ink roller sleeve b2. Rotating the ink cartridge frame clockwise until it is horizontal completes the installation. Simultaneously, the O-ring a9 is compressed, causing the ink cartridge side plate a1 to fit tightly against the ink roller bushing a2. By adjusting the adjusting screw a6, the scraper a7 fits tightly against the ink roller shaft b1, thus forming a groove for storing ink. To replace the ink, simply rotate the ink cartridge 45° counterclockwise and pull it out to remove any residual ink from the previous batch. This design facilitates ink replacement and is suitable for applications where products are frequently changed, requiring frequent changes of different inks.

[0136] Optionally, as shown in Figure 9-11, the clutch assembly n includes:

[0137] The clutch plate n1 has one end rotatably connected to the outside of the front wall plate q, and the other end of the ink transfer roller g passes through the front wall plate q and is rotatably connected to the middle of the clutch plate n1. The other end of the clutch plate n1 is provided with a first upper inclined surface and a first lower inclined surface.

[0138] A limiting component is fixedly installed on the front wall plate q and its position corresponds to the clutch plate n1. It is used to limit the clutch plate n1 from rotating in the direction closer to the magnetic roller h.

[0139] Clutch pressure plate n2, one end of clutch pressure plate n2 is rotatably connected to the outside of front wall plate q, the other end of clutch pressure plate n2 is provided with a second upper inclined surface and a second lower inclined surface, the second lower inclined surface is used to contact the first upper inclined surface so that clutch plate n1 is kept in contact with the limiting component, and the second upper inclined surface is used to contact the first lower inclined surface so that clutch plate n1 is kept in contact with the limiting component.

[0140] An elastic component is fixedly mounted on the front wall panel q and connected to the clutch pressure plate n2. It is used to provide a restoring force to the clutch pressure plate n2 so that the second lower inclined surface keeps in contact with the first upper inclined surface or keeps the second upper inclined surface in contact with the first lower inclined surface.

[0141] Optionally, the clutch assembly n further includes:

[0142] Clutch handle n5 is located on clutch plate n1;

[0143] Pressure plate handle n10, pressure plate handle n10 is located on clutch pressure plate n2.

[0144] Optionally, the limiting component includes:

[0145] Pressure adjusting screw seat n6 is fixedly installed on the front wall panel q;

[0146] The pressure adjusting screw n7 passes through the pressure adjusting screw seat n6 and corresponds to the first limit face. The pressure adjusting screw n7 can adjust the extension length.

[0147] In this embodiment, the elastic components include a spring seat n3 and a spring n4. The clutch plate n1 is locked to the rear wall plate p or the front wall plate q by a locking screw n8, releasing the degree of freedom of rotation along the screw hole axis. That is, the clutch plate n1 can rotate around the screw hole. The pressure adjusting screw n7 restricts the rotation angle of the clutch plate n1, thus controlling the pressure and engagement / disengagement state between the ink transfer roller g and the resin plate on the surface of the magnetic roller h. When the clutch plate n1 contacts the pressure adjusting screw n7, the clutch pressure plate n2 is subjected to the elastic force of the spring n4. The pulley on the clutch pressure plate n2 presses against the upper inclined surface of the clutch plate n1, preventing the clutch plate n1 from separating from the pressure adjusting screw n7. Simultaneously, the ink transfer roller g contacts the resin plate on the surface of the magnetic roller h, connecting the ink path and allowing normal printing. When printing products in small batches with many print runs, frequent changes of ink and resin plates are often required. Sometimes 2-3 different batches of products need to be changed per day, and sometimes different products need to be changed every 5-6 days. As a consumable item, the rubber blanket experiences a decrease in hardness and surface wear with prolonged use, affecting print quality. Due to variations in printing press speed settings and production shifts, the replacement interval for the rubber blanket varies, generally every 10-30 days. When the clutch plate n1 disengages from the adjusting screw n7, the clutch pressure plate n2, under the elastic force of the spring n4, has its clutch pulley n9 pressing against the lower inclined surface of the clutch plate, preventing contact between the clutch plate n1 and the adjusting screw n7. Simultaneously, the ink transfer roller g separates from the resin plate on the surface of the magnetic roller h, disconnecting the ink path. This allows for cleaning of the printing roller i and magnetic roller h, or replacement of the resin plate and rubber blanket. This structure replaces the traditional eccentric shaft clutch structure, reducing processing difficulty and manufacturing costs.

[0148] Example 2

[0149] As shown in Figures 12-14, this embodiment provides an offset printing machine, which differs from Embodiment 1 in that the ink cartridge a includes:

[0150] A pair of adjustment bases, which are detachably connected to the retaining plate b3;

[0151] The ink cartridge body is connected between a pair of adjustment bases.

[0152] A pair of ink cartridge side plates a1, each ink cartridge side plate a1 having an arc groove a16 that matches the middle of the ink roller shaft b1;

[0153] Several first anti-leakage screws a15, the first anti-leakage screws a15 are perpendicular to the ink roller shaft b1 and pass through the adjustment base to contact the ink cartridge side plate a1, and are used to provide a first clamping force so that the arc groove a16 of the ink cartridge side plate a1 fits with the middle part of the ink roller shaft b1.

[0154] Several second anti-leakage screws a17 are parallel to the ink roller shaft b1 and pass through the adjusting base to contact the ink cartridge side plate a1. They are used to provide a second clamping force so that the side of the ink cartridge side plate a1 fits against the side of the scraper a7 of the ink cartridge body.

[0155] In this embodiment, the adjusting base includes: a disassembly base plate a12, a longitudinal adjustment support plate a13, and a transverse adjustment support plate a14. The fit between the scraper blade a7 and the ink roller shaft b1 is controlled by the adjusting screw a6, which controls the thickness of the ink on the ink roller surface. The upper part of the scraper blade a7 is pressed onto the adjusting screw seat a5 by the scraper blade pressure plate a3. The scraper blade pressure plate a3 and the adjusting screw seat a5 are of equal length, and the scraper blade a7 extends 0.5mm at each end. The Teflon ink cartridge side plate a1 is tightly fitted to both sides of the scraper blade a7 by the second anti-leakage screw a17 relative to the axial direction of the ink roller shaft b1, preventing ink leakage. The Teflon ink cartridge side plate a1 is tightly fitted to the ink roller shaft b1 by the first anti-leakage screw a15 relative to the radial direction of the ink roller shaft b1, preventing ink leakage. The advantage of this structure is that it is not easy to leak ink, but the disadvantage is that it is difficult to disassemble. However, in working condition 2, factories generally rarely change ink, and the requirements for leak prevention are relatively high. It is suitable for working conditions where a single product is produced year after year, that is, where ink is not frequently changed.

[0156] The operation method of the offset printing machine in this embodiment is as follows:

[0157] First, press down the pressure plate handle n10 on the clutch pressure plate n2, and move the clutch handle n5 on the clutch plate n1 to separate the clutch plate from the pressure adjusting screw n7. The purpose of this operation is to separate the ink transfer roller g from the resin plate on the surface of the magnetic roller h, disconnect the ink path, and facilitate subsequent adjustment of ink thickness.

[0158] Next, adjust the pre-adjustment screw a6 and the first anti-leakage screw a15 appropriately to ensure the initial ink thickness. Add ink to ink cartridge a. Since the higher the rotation speed of ink roller b, the more ink is transferred per unit time, set the gearbox m to low speed and start the machine. After starting, observe the ink thickness: if the ink color is too light, the ink is too thin, and the adjustment screw a6 needs to be loosened appropriately to increase the gap between the doctor blade and ink roller b, thereby thickening the ink and making the ink color darker; if the ink color is too dark, the ink is too thick, and the adjustment screw a6 needs to be tightened appropriately to decrease the gap between the doctor blade and ink roller b, thereby thinning the ink and making the ink color lighter. Repeat the operation until the appropriate state is achieved.

[0159] Finally, press down the pressure plate handle n10 on the clutch plate n2, and move the clutch handle on the clutch plate n1 to make the clutch plate contact the pressure adjusting screw n7, allowing the ink transfer roller g to contact the resin plate on the surface of the magnetic roller h, thus connecting the ink path and starting the product trial run. During the trial run, observe whether the color depth of the product is consistent with the sample. If the color is too light, loosen the pressure adjusting screw n7 to increase the contact pressure between the ink transfer roller g and the resin plate on the surface of the magnetic roller h, thereby deepening the pattern color; if the color is too dark, tighten the pressure adjusting screw n7 to decrease the contact pressure between the ink transfer roller g and the resin plate on the surface of the magnetic roller h, thereby lightening the pattern color. Repeat the operation until the pattern of the trial product is indistinguishable from the pattern of the sample.

[0160] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An offset printing machine, characterized in that, include: An offset printing press ink transfer and distribution system includes: an ink roller (b), an ink take-up roller (c), a first set of ink rollers (d), a transition roller (e), a second set of ink rollers (f), an ink transfer rubber roller (g), a magnetic roller (h), a printing roller (i), and a rear wall plate (p) and a front wall plate (q) arranged opposite to each other, which are in sequential contact and drive each other; an ink cartridge (a) installed on the ink roller (b) for supplying ink (k) to the surface of the ink roller (b); a drive component connected to the printing roller (i) for driving the printing roller (i) to rotate; a gearbox (m) through which the ink transfer rubber roller (g) and the ink roller (b) are connected for transmission; and a first gear (i1). The first gear (i1) is disposed at one end of the printing roller (i); the second gear (h1) is disposed at one end of the magnetic roller (h) and meshes with the first gear (i1); the third gear (g1) is disposed at one end of the ink transfer roller (g) and meshes with the second gear (h1); the clutch assembly (n) is connected to the ink transfer roller (g) and is used to control the disengagement action of the ink transfer roller (g) and the magnetic roller (h); the ink roller (b) includes: an ink roller shaft (b1), which is rotatably connected between the rear wall plate (p) and the front wall plate (q). The roller shaft (b1) is a stepped shaft, with the diameter at the middle part being larger than the diameter at both ends. The middle part of the roller shaft (b1) is used for ink transfer. A pair of roller sleeves (b2) are rotatably fitted onto both ends of the roller shaft (b1). A pair of sleeve fixing plates (b3) are used to fix the roller sleeves (b2) to the rear wall plate (p) and the front wall plate (q). The ink cartridge (a) includes: a pair of adjusting bases, detachably connected to the sleeve fixing plates (b3); an ink cartridge body connected between the pair of adjusting bases; and a pair of ink cartridge side plates (a1), each side plate having a groove for connecting to the ink cartridge. The roller body (b1) has a matching arc groove (a16) in the middle; a plurality of first anti-leakage screws (a15), which are perpendicular to the ink roller body (b1) and pass through the adjusting base to contact the ink cartridge side plate (a1) to provide a first clamping force so that the arc groove (a16) of the ink cartridge side plate (a1) fits with the middle of the ink roller body (b1); a plurality of second anti-leakage screws (a17), which are parallel to the ink roller body (b1) and pass through the adjusting base to contact the ink cartridge side plate (a1) to provide a second clamping force so that the side of the ink cartridge side plate (a1) fits with the side of the scraper blade (a7) of the ink cartridge body.The clutch assembly (n) includes: a clutch plate (n1), one end of which is rotatably connected to the outside of the front wall plate (q), and the other end of the ink transfer roller (g) passes through the front wall plate (q) and is rotatably connected to the middle of the clutch plate (n1). The other end of the clutch plate (n1) is provided with a first upper inclined surface and a first lower inclined surface; a limiting component, which is fixedly disposed on the front wall plate (q) and positioned corresponding to the clutch plate (n1), for limiting the clutch plate (n1) from rotating toward the magnetic roller (h); and a clutch pressure plate (n2), one end of which is rotatably connected to the outside of the front wall plate (q), and the other end of the clutch pressure plate (n2) is provided with a second upper inclined surface and a second lower inclined surface. The inclined surface is used to contact the first upper inclined surface to keep the clutch plate (n1) in contact with the limiting component; the second upper inclined surface is used to contact the first lower inclined surface to keep the clutch plate (n1) and the limiting component in contact; an elastic component is fixedly disposed on the front wall panel (q) and connected to the clutch pressure plate (n2) to provide a restoring force to the clutch pressure plate (n2) to keep the second lower inclined surface in contact with the first upper inclined surface or to keep the second upper inclined surface in contact with the first lower inclined surface; the clutch assembly (n) further includes: a clutch handle (n5) disposed on the clutch plate (n1); and a pressure plate handle (n10) disposed on the clutch pressure plate (n2).

2. The offset printing machine according to claim 1, characterized in that, When the printing roller (i) rotates, it can drive the ink roller (b), the ink-taking roller (c), the transition roller (e), the ink transfer roller (g), and the magnetic roller (h) to rotate. When the printing roller (i) rotates, it can also drive the first string of ink rollers (d) and the second string of ink rollers (f) to rotate and reciprocate along the axial direction. The ink roller (b), the ink-taking roller (c), the first string of ink rollers (d), the transition roller (e), the second string of ink rollers (f), and the ink transfer roller (g) are all installed between the rear wall plate (p) and the front wall plate (q). The magnetic roller (h) and the printing roller (i) are rotatably mounted on the support component.

3. The offset printing machine according to claim 1, characterized in that, The first ink roller (d) and the second ink roller (f) have the same structure, both including: an ink roller shaft (d2), which is non-rotatably connected between the rear wall plate (p) and the front wall plate (q); an ink roller sleeve (d6), which is movably sleeved on the outside of the ink roller shaft (d2); a figure-eight oil groove (d3), which is provided on the outer surface of the ink roller shaft (d2); a keyway, which is provided on the inner surface of the ink roller sleeve (d6); and a fork pin (d5), one end of which is embedded in the keyway and the other end of which is embedded in the figure-eight oil groove (d3).

4. The offset printing machine according to claim 1, characterized in that, The inner sides of the rear wall panel (p) and the front wall panel (q) are provided with a pair of downwardly inclined first sliding grooves (p1) and a pair of second sliding grooves (p2); the two ends of the first ink roller (d) are provided with a pair of first sliders (r1), and the pair of first sliders (r1) are slidably disposed in the pair of first sliding grooves (p1); the two ends of the second ink roller (f) are provided with a pair of second sliders (r2), and the pair of second sliders (r2) are slidably disposed in the pair of second sliding grooves (p2); the two ends of the transition roller (e) are provided with a pair of third sliders (r3), and the pair of third sliders (r3) are slidably disposed in the pair of second sliding grooves (p2) and located above the second sliders (r2).

5. The offset printing machine according to claim 1, characterized in that, The limiting component includes: a pressure adjusting screw seat (n6), which is fixedly disposed on the front wall panel (q); and a pressure adjusting screw (n7), which passes through the pressure adjusting screw seat (n6) and corresponds to the first limiting surface, and the pressure adjusting screw (n7) can adjust the extension length.

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