GB2512769A

GB2512769A - Method and device for ink transfer and feed, and printing apparatus having the device

Info

Publication number: GB2512769A
Application number: GB1411527.3A
Authority: GB
Inventors: Ming Bi; Mingsheng Qu; Leping Li; Tongbo Zhu; Fangjian Li; Yanping Li; Chuan Wang; Xueliang Dong; Yuzhen Huang
Original assignee: SECURITY PRINTING INST OF PEOPLE S BANK OF CHINA; China Banknote Printing and Minting Corp
Current assignee: SECURITY PRINTING INST OF PEOPLE S BANK OF CHINA; China Banknote Printing and Minting Corp
Priority date: 2011-12-23
Filing date: 2011-12-23
Publication date: 2014-10-08
Anticipated expiration: 2031-12-23
Also published as: CN103282206B; AT514850A5; GB201411527D0; CH706793B1; CH706793B8; GB2512769B; WO2013091246A1; AT514850B1; JP5828965B2; CN103282206A; JP2014533615A; DE112011106012T5

Abstract

Disclosed are a method and device for ink transfer and feed, and a printing apparatus comprising the device. The device for ink transfer and feed comprises: at least one set of ink feed mechanisms, each set comprising at least an ink supply device, a colour mould roller and an ink transfer roller; the ink transfer roller is connected to a plate cylinder; the ink feed mechanism and the plate cylinder are driven by first and second driving systems, respectively. During a stipulated period, the plate cylinder rotates at a constant speed, and the ink transfer roller can rotate at a variable speed with respect to the plate cylinder, such that the ink transfer roller is offset from the ink transfer position of the plate cylinder by a set spacing, and the offset spacing can be adjusted according to the web requirements of the product to be printed, without the need to exchange the colour mould roller, ink transfer roller and plate cylinder, etc. Hence, the present invention can ensure sufficient ink supply from the ink feed mechanism to the paper to be printed and meet the requirements for printing various products very well, greatly improving the printing quality and productive efficiency.

Description

METHOD AND APPARATUS FOR INK TRANSFER AND SUPPLY AND

PRINTING EQUIPMENT HAVING THE APPARATUS

Field of the Invention

The present invention relates to a method and an apparatus for ink transfer and supply and a printing equipment having the apparatus.

Background of the Invention

In order to ensure normal and ordered social economic activities, the anti-counterfeit printing is adopted in the printing process of the marketable securities such as bills, securities and notes.

In order to improve the anti-counterfeit level of the marketable securities, people usually print images and texts of two or more colors on the marketable securities. For the continuous image-text printing in the circumferential direction of the printing plate is cylinder, different color regions are separated from each other on the same rotary surface of the printing plate cylinder, thus the ink must be supplied to different color regions at fixed points, so as to ensure the accurate separation between them.

Currently, a known fixed point ink supply method is designed so that the diameter of the printing plate cylinder is an integral multiple of that of the ink transfer cylinder, so as to ensure that during the rotation and ink transfer, each point on the surface of the printing plate cylinder is always corresponding to a certain point on the surface of the ink transfer roller in a one-to-one manner The fixed-point ink supply method is easily to be realized, but a certain point on the printing plate cylinder is always ink supplied by a certain fixed point on the surface of the ink transfer roller, so in the printing process, some regions on the surface of the printing plate cylinder are inevitably ink supplied insufficiently, which may directly influence the product quality and the anti-counterfeit performance of the marketable securities, and even result in waste products.

In order to avoid the situation that a certain region on the surface of the printing plate cylinder may be ink supplied insufficiently in the prior art, the inventor of the present invention considers performing a relative position shift of ink each time the ink transfer roller makes an ink transfer, in the process where the ink transfer roller transfers the ink to the printing plate cylinder. The Chinese patent No. 200410050147.8 discloses a "shift ink transfer number cabling printer", comprising a number printing unit having a number cylinder, an impression cylinder and two groups of ink transfer systems, and each group of ink transfer system is composed of an ink feed device, a color module roller and an ink transfer roller, the diameter of the color module roller is matched with that of the ink H transfer roller, the ink transfer roller in the two groups of ink transfer systems transfers ink to the number cylinder, and the diameter ratio between the number cylinder and the ink transfer roller is a non-integer. After a non-integer multiple relation is made between the diameter of the number cylinder and the diameter of the ink transfer roller, in the working process, when the number cylinder is rotated for J circles, the ink transfer roller is rotated for F circles, so as to complete an ink transfer cycle. Thus in each ink transfer cycle, the ink is transferred to the same color zone of each number on the number cylinder for J times by J ink storage regions on corresponding ink transfer roller, such that each number is sufficiently ink supplied, thereby eliminating the defect of insufficient ink amount, and ensuring the printing quality.

In the shift ink transfer number cabling printer, the diameter of the number cylinder is designed to be a non-integer multiple of the diameter of the ink transfer roller. Thus although the purpose of shift ink transfer is well achieved, the diameters of the ink transfer roller, the color module roller and the number cylinder are all limited by the breadth of the product to be printed. The known structure requires the outer surface perimeter of the ink transfer roller to be an integral multiple of the common divisor of the bill width, otherwise the shifted ink transfer cannot be accurately achieved. Thus in order to meet the requirement of shifted ink transfer, the known structure must exchange the entire cylinder including the ink transfer roller, the color module roller and the number (printing plate) cylinder when a presswork is replaced (i.e., the size and pattern of the presswork are changed) due to the change of the shift interval of the shifted ink transfer.

The known structure is complex, the area for application is limited, the operation cost is high in the actual production, and much time is spent in replacing the entire cylinder, which increases the production cost.

Summary of the Invention

The object of the present invention is to provide a method and an apparatus for ink transfer and supply, and a printing equipment having the apparatus.

Thus, the present invention proposes an ink transfer and supply method, in which an ink supply mechanism and a printing plate cylinder are driven by a first drive system and a second drive system independent from each other, respectively, wherein each group of ink supply mechanism at least comprises an ink feed device, a color module roller and an ink transfer roller; the ink transfer roller is connected to a printing plate cylinder; within specified time, the printing plate cylinder is rotated in a constant speed, while the ink transfer roller can move in a variable speed relative to the printing plate cylinder, such that the ink transfer roller shifts by a specified interval relative to the ink s transfer position of the printing plate cylinder.

Wherein, after the color module roller transfers the ink to the ink transfer roller, ink storage regions corresponding to the color module groups on the color module roller in size and interval therebetween are formed on the ink transfer roller, and each ink storage region is composed of ink storage blocks having the same size and interval therebetween as the color modules of corresponding color module group; and the ink storage regions on the ink transfer roller are corresponding to image-text regions provided on the printing plate cylinder.

Further, when the printing plate cylinder is rotated to its working position to be opposite to the ink transfer roller, the color module roller and the ink transfer roller driven is by the first drive system may be rotated at the same speed as the printing plate cylinder driven by the second drive system; when the printing plate cylinder is rotated to its non-working position to be opposite to the ink transfer roller, the first drive system drives the color module roller and the ink transfer roller to be rotated at a larger or smaller speed than the printing plate cylinder, such that once the printing plate cylinder is rotated for a circle, the ink can be transferred to the same color zone in each image-text region at the working position by a different ink storage block in the same ink storage region on the ink transfer roller, or by a different ink storage region on the ink transfer roller.

In addition, a specified interval for ink transfer position shift of the ink transfer roller relative to the printing plate cylinder may be an integral multiple of an interval between two adjacent ink storage blocks in the same ink storage region.

The specified interval for ink transfer position shift of the ink transfer roller relative to the printing plate cylinder may be 1 to x-1 times of the interval between two adjacent ink storage blocks in the same ink storage region, wherein x is the number of the ink storage blocks in the same ink storage region.

The present invention further provides an ink transfer and supply apparatus, comprising at least one group of ink supply mechanism, and each group of ink supply mechanism at least comprises an ink feed device, a color module roller and an ink transfer roller; the ink transfer roller is connected to a printing plate cylinder; and the ink supply mechanism and the printing plate cylinder are driven by first and second drive systems, respectively.

In addition, the present invention further provides a printing equipment comprising the aforementioned ink transfer and supply apparatus.

As compared with the prior art, the present invention has the following characteristic and advantages: The ink supply mechanism and the printing plate cylinder are driven by two different independent drive systems, respectively. Within a certain time, the printing plate cylinder is rotated in a constant speed, while the ink supply mechanism is rotated in a variable speed relative to the printing plate cylinder following a certain rule, such that the ink transfer position of the ink supply mechanism relative to the printing plate cylinder in each movement cycle is shifted for a certain interval following a certain rule. In addition, the shifted interval for ink transfer of the ink supply mechanism can be adjusted according to the breadth of the product to be printed, thereby ensuring that the ink supply mechanism sufficiently feeds the ink to the image and text to be printed, and meets the printing requirements of different presswork. When a different presswork is to be substituted, the present invention only needs to change the color module groups on the outer surface of each color module wheel while adjusting the control system of the drive system of the ink supply mechanism, thereby changing the shifted ink transfer interval, without replacing the color module roller, the ink transfer roller or the printing plate cylinder Therefore, the present invention can greatly save the time and the production cost, while improving the production efficiency of the printing equipment.

Brief Description of the Drawings

The following drawings are only used to schematically illustrate and explain the present invention, rather than limiting the scope of the present invention, in which, Fig. 1 is a schematic structural diagram of a drive section of an ink transfer and supply apparatus according to the present invention; Fig. 2 is a schematic structural diagram before a shift adjustment of an ink transfer and supply apparatus according to the present invention; Fig. 3 is a schematic structural diagram after a shift adjustment of an ink transfer and supply apparatus according to the present invention; Fig. 4 is an unfolded diagram of an outer circumferential surface of a color module wheel according to the present invention, which illustrates the position of a color module group thereon and the positional relation between respective color modules; Fig. 5 is a schematic structural diagram of another embodiment of an ink transfer and supply apparatus according to the present invention; Fig. 6 is a schematic structural diagram of a printing unit in a printing equipment having an ink transfer and supply apparatus according to the present invention; and s Fig. 7 is a schematic structural diagram of a color module roller in an ink transfer and supply apparatus according to the present invention.

Detailed Description of the Preferred Embodiments

The present invention proposes an ink transfer and supply apparatus, comprising at to least one group of ink supply mechanism, and each group of ink supply mechanism at least comprises an ink feed device, a color module roller and an ink transfer roller; the ink transfer roller is connected to a printing plate cylinder; the ink supply mechanism and the printing plate cylinder are driven by first and second drive systems, respectively.

Further, the diameters of the color module roller and the ink transfer roller are equal to or integral multiples of each other.

Further, the color module roller may comprise a center shaft and at least one color module wheel provided thereon, and the outer circumferential surface of each color module wheel is provided with at least one color module group.

Each color module group may be at least composed of two color modules, and respective color modules have the same shape and interval therebetween.

Further, after transfering ink to the ink transfer roller, the color module roller may form on the ink transfer roller ink storage regions corresponding to respective color module groups on the color module roller in size and interval, and each ink storage region is composed of ink storage blocks having the same size and interval with the color module.

Further, the ink storage regions on the ink transfer roller are corresponding to the image-text regions provided on the printing plate cylinder.

The ink transfer and supply method proposed by the present invention drives the ink supply mechanism and the printing plate cylinder with two independent drive systems, Jo respectively, wherein each group of ink supply mechanism at least comprises an ink feed device, a color module roller and an ink transfer roller, and the ink transfer roller is connected to a printing plate cylinder; within specified time, the printing plate cylinder is rotated in a constant speed, while the color module roller and the ink transfer roller can move in variable speeds relative to the printing plate cylinder, such that the color module roller and the ink transfer roller shift for a specified interval relative to the ink transfer position of the printing plate cylinder.

A feasible solution is as follows: when the printing plate cylinder is rotated to its working position opposite to the ink transfer roller, a first drive system drives the color module roller and the ink transfer roller to be rotated at the same speed as the printing plate cylinder driven by a second drive system; when the printing plate cylinder is rotated to its non-working position opposite to the ink transfer roller, the first drive system drives the color module roller and the ink transfer roller to be rotated at a larger or smaller speed than the printing plate cylinder. Once the printing plate cylinder is rotated for a cycle, the ink can be transferred to the same color zone in each image-text region on the working position by different ink storage blocks in the same ink storage region on the ink transfer roller, or different ink storage regions on the ink transfer roller.

Specifically, the specified shift interval may be an integral multiple of the interval between two adjacent ink storage blocks in the same ink storage region on the ink is transfer roller, i.e., an integer between 1 and (rn-i), wherein m is the number of the ink storage blocks in the same ink storage region.

The present invention uses two independent drive systems to drive the ink supply mechanism and the printing plate cylinder, respectively, such that the color module roller and the ink transfer roller move at the same speed as the printing plate cylinder in the working region, and the color module roller and the ink transfer roller move at a larger or smaller speed than the printing plate cylinder when the printing plate cylinder is rotated to the non-working region, thus the ink transfer roller is shifted for a specified interval relative to the printing plate cylinder, so as to ensure that each time the ink is transferred to the same color zone in the printed image-text on the printing plate cylinder by different ink storage blocks in the same ink storage region on corresponding ink transfer roller or by different ink storages on corresponding ink transfer roller, and the ink can be sufficiently supplied to each color zone in the printed image or text. When the type of the presswork is changed, the interval between the image-text regions on the printing plate cylinder is changed, and the interval between the ink storage regions on the ink transfer roller and the interval for shifted ink transfer are also changed. In the present invention, the interval between the color module groups on the color module wheel and the interval for shifted ink transfer can be adjusted just by changing the color module groups on the outer surface of the color module wheel and changing the drive control system, without replacing the color module roller, the ink transfer roller or the printing plate cylinder, thereby greatly improving the production efficiency, reducing the production cost, and greatly expanding the applicable range of the products made by the technical equipment.

The printing equipment proposed by the present invention includes the ink transfer and supply apparatus, wherein the printing plate cylinder and the impression cylinder are driven by the second drive system.

In order to more clearly understand the technical features, objects and effects of the present invention, the structures, features and effects of the combined printing apparatus of the present invention will be described in detail as follows with reference to the drawings and preferred embodiments. In addition, through the descriptions of the embodiments, the technical means adopted to achieve the intended objects of the present invention and the produced effects will be understood more deeply and concretely. However, the drawings just provide references and illustrations, rather than limitations to the present invention.

The following drawings are only used to schematically illustrate and explain the is present invention, rather than limiting the scope of the present invention. In which, Fig. 1 is a schematic structural diagram of a drive section of an ink transfer and supply apparatus according to the present invention; Fig. 2 is a schematic structural diagram before a shift adjustment of an ink transfer and supply apparatus according to the present invention; Fig. 3 is a schematic structural diagram after a shift adjustment of an ink transfer and supply apparatus according to the present invention; Fig. 4 is an unfolded diagram of an outer circumferential surface of a color module wheel according to the present invention, which illustrates the position of a color module group and the positional relation between respective color modules; Fig. 5 is a schematic structural diagram of another embodiment of an ink transfer and supply apparatus according to the present invention; Fig. 6 is a schematic structural diagram of a printing unit in a printing equipment having an ink transfer and supply apparatus according to the present invention; and Fig. 7 is a schematic structural diagram of a color module roller in an ink transfer and supply apparatus according to the present invention.

As illustrated in the drawings, the ink transfer and supply apparatus proposed by the present invention comprises: at least one group of ink supply mechanism 10, and each group of ink supply mechanism at least comprises an ink feed device 13, a color module roller 12 and an ink transfer roller 11; the ink transfer roller 11 is connected to a printing plate cylinder 30; the ink supply mechanism 10 and the printing plate cylinder 30 are driven by first and second drive systems, respectively.

The diameters of the color module roller 12 and the ink transfer roller 11 are equal to or integral multiples of each other. In this embodiment, as illustrated in Figs. 1, 2, 3, 5 and 6, the descriptions are made only through examples where the diameters of the color module roller 12 and the ink transfer roller 11 are equal to each other s The color module roller 12 comprises a center shaft 12" and at least one color module wheel 12' provided thereon, and the outer circumferential surface of each color module wheel 12' is provided with at least one color module group 120. Each color module group is at least composed of two color modules, and respective color module groups 120 provided on the outer circumferential surface of the color module wheel 12' have the same shape, quantity and interval therebetween, and respective color modules in the same color module group have the same shape and interval therebetween.

The color module wheel 12' is connected to the central shaft of the color module roller 12 with a conventional prior art, which is omitted herein.

In this embodiment, three color module groups 120 provided on the outer circumferential surface of the color module wheel 12' are schematically illustrated through an example where the diameter radio between the color module roller 12, the ink transfer roller 11 and the printing plate cylinder 30 is 1: 1: 2. The three color module groups are denoted with reference signs 121, 122 and 123, respectively, and each color module group is composed of four color modules a, b, c and d. Meanwhile, three image-text regions 300 are provided in the working region of the printing plate cylinder 30, and denoted with reference signs 301, 302 and 303 respectively, as shown in Fig. 2.

After the color module roller 12 inks the ink transfer roller 11, three ink storage regions 110 corresponding to the three color module groups 121, 122 and 123 on the color module roller are formed on the ink transfer roller 11, and denoted with reference signs 111, 112 and 113, respectively, wherein each ink storage region 110 is composed of four ink storage blocks a', b', c' and d'. Three image-text regions 300 on the printing plate cylinder are corresponding to the three ink storage regions formed on the ink transfer roller 11 in a one-to-one manner, and inked in order by the four ink storage blocks a', b', c' and din the ink storage region 110 following a certain rule.

In addition, the surface of the ink transfer roller 11 is made of an elastic material, while the surface of the color module roller 12 is made of a hard material. The elastic material has shore hardness in a range from 30 to 45, for example it may be a rubber layer or a polyester layer; and the hard material may be a nylon plate or a metal plate.

Of course, the ink transfer and supply apparatus of the present invention is not limited to being provided with just one group of ink supply mechanism 10. Fig. 5 is a schematic structural diagram of an ink transfer and supply apparatus provided with two groups of ink supply mechanisms 10. Therefore, the number of the ink supply mechanisms may be set upon the actual demand, wherein the structure and principle of s each group of ink supply mechanism are the same as each other. Herein just one group of ink supply mechanism is described as an example.

A printing equipment proposed by the present invention at least comprises a printing unit as illustrated in Fig. 6, wherein the printing plate cylinder 30 and the impression cylinder 50 are driven by the second drive system to be rotated synchronously.

In one specific embodiment, ink is supplied to the ink supply mechanism 10 by a set of independent ink feed mechanism 13, wherein each set of independent ink feed mechanism 13 may be composed of an ink fountain, an ink fountain roller, an ink vibrator and an ink distributing roller. Each group of ink supply mechanism 10 comprises the ink feed mechanism 13, the color module roller 12 and the ink transfer roller 11 connected in order. The ink feed mechanism 13 transfers the ink to the ink transfer roller 11 through the color module roller 12, and then the ink transfer roller 11 transfers the ink to corresponding image-text region 300 on the printing plate cylinder 30 contacted therewith. The ink supply mechanism 10 is driven independently by the first drive system, and it may be driven independently by a servo motor 40 as illustrated in Fig. 1. The printing plate cylinder 30 and the impression cylinder 50 are driven by the second drive system, such as another motor (not illustrated). In this embodiment, the color module roller 12 is connected to the first drive system, and drives the color module roller 12 and the ink transfer roller 11 to be rotated synchronously through the gears 41 engaged with each other. In addition, the diameter of the color module roller 12 is equal to that of the ink transfer roller 11.

Of course, Fig. 1 just illustrates a specific embodiment. The servo motor 40 is not limited to driving the color module roller 12, instead, it may directly drive any of the ink transfer roller, the ink vibrator and the ink distributing roller, and drive other rollers of the ink supply mechanism to be rotated synchronously via a gear drive.

As illustrated in Fig. 5, when there are two groups of ink supply mechanisms 10, an optional solution is that one independent drive system 40 synchronously drives the color module rollers 12, 22 in the two groups of ink supply mechanisms 10, and drives the ink transfer rollers 11, 21 in the two groups of ink supply mechanisms 10, respectively, via the gears engaged with each other. Another feasible embodiment is that the two groups of ink supply mechanisms 10 are driven by two drive systems, respectively. For example, they may be driven by two servo motors which are rotated synchronously, The control manner thereof is the prior art, and herein is omitted.

The working principle of the present invention is that the ink supply mechanism 10 is s driven by the first drive system (e.g., the servo motor 40), wherein the ink supply mechanism 10 at least comprises the ink feed mechanism 13, the color module roller 12 and the ink transfer roller 11 connected in order. The color module roller 12 and the ink transfer roller 11 are driven by the servo motor 40 to be rotated synchronously. Each ink transfer roller 11 is connected to a printing plate cylinder 30, wherein the printing plate cylinder 30 and the impression cylinder 50 are driven by another drive system (not illustrated) to be rotated synchronously.

In operation, each ink transfer roller 11 of the ink supply mechanism 10 transfers the ink to corresponding printing plate cylinder 30. In a certain time, the printing plate cylinder 30 is rotated in a constant speed, while the ink supply mechanism 10 is rotated in a variable speed relative to the printing plate cylinder 30 following a certain rule, such that the ink transfer position of the ink supply mechanism 10 relative to the printing plate cylinder 30 in each movement cycle is shifted for a certain interval following a certain rule.

Specifically, when the printing plate cylinder 30 is rotated to its working position (i.e., a position where the image-text region 300 is provided) to be opposite to the ink transfer roller 11, as illustrated in Fig. 2 (in this embodiment, when the image-text regions 301, 302, 303 of the printing plate cylinder 30 are contacted with the ink storage blocks a' of the ink storage regions 111, 112, 113 of the ink transfer roller 11, respectively), the servo motor 40 drives the color module roller 12 and the ink transfer roller 11 to be synchronously rotated at the same speed as the printing plate cylinder 30. When the printing plate cylinder 30 is rotated to its non-working position A (i.e., a position where no image or text is provided) to be opposite to the ink transfer roller 11 (i.e., when the ink transfer roller 11 is contacted with each image-text region 300 provided on the printing plate cylinder 30 to complete one time of ink transfer, and the printing plate cylinder 30 is rotated to its non-working position Ato be opposite to the ink transfer roller 11), the servo motor 40 drives the color module roller 12 and the ink transfer roller 11 to be rotated at a larger or smaller speed than the printing plate cylinder 30, such that after the printing plate cylinder 30 is rotated for a circle to complete an ink transfer cycle, the ink is transferred to respective image-text regions 300 on the printing plate cylinder 30 in the next ink transfer cycle by different ink storage blocks in the same ink storage region 110 on the ink transfer roller 11, as illustrated in Fig. 3, which schematically illustrates that after an ink transfer between the ink transfer roller 11 and the printing plate cylinder as illustrated in Fig. 2, the variable speed control is performed by the servo motor 40, such that the ink transfer positions of the ink transfer roller 11 and the printing plate cylinder 30 s are adjusted by a shift, and the ink storage blocks c' of the ink storage region 111, 112, 113 transfer the ink to the image-text regions 301, 302, 303.

Further specifically, when the ink transfer roller 11 is in the working region of the printing plate cylinder 30, it is rotated synchronously with the printing plate cylinder 30, and transfers the ink from each ink storage region 110 on the ink transfer roller 11 to each image-text region 300 provided in the working region of the printing plate cylinder via cooperation with the printing plate cylinder 30. When the ink transfer roller 11 is in the non-working region A (i.e., the neutral position) of the printing plate cylinder 30, the ink transfer roller 11 is rotated at a speed different from that of the printing plate cylinder 30, and a stepless speed regulation is performed by the servo motor 40 to drive the color module roller 12 to shift the position in a predetermined interval. Since the color module roller 12 and the ink transfer roller 11 are connected to each other through gears with a diameter ratio of 1: 1, the ink transfer roller 11 and the color module roller 12 are shifted synchronously. For example, in the first cycle (see Fig. 2), firstly the ink storage block a' in each of the ink storage regions liii 112, 113 on the ink transfer roller 11 transfers the ink to the image-text regions 301, 302, 303 on the printing plate cylinder 30. In the non-working region, the ink transfer roller is driven by the servo motor 40 to perform a variable speed control, such that in a second work cycle (i.e., the printing plate cylinder is located in the working section again), other ink storage blocks in the ink storage regions 111, 112, 113 ofthe inktransfer roller 11, except ink storage block a', forexample ink storage block c' in Fig. 3, transfers the ink to the image-text regions 301, 302, 303 on the printing plate cylinder 30.

Fig. 3 just illustrates an example where the ink storage region on the ink transfer roller 11 is shifted by three color module intervals relative to the printing plate cylinder 30, but the present invention is not limited thereto. After the variable speed control of the color module roller and the ink transfer roller is performed in the non-working region of the printing plate cylinder, in the next work cycle, the ink may be transferred to the same image-text region on the printing plate cylinder 30 by any ink storage block, except ink storage block a', in the same ink storage region on the ink transfer roller 11, provided that the interval of each variable-speed shift is an integral multiple of the interval between two adjacent ink storage blocks in the same ink storage region on the ink transfer roller, i.e., an integer from 1 to (x-1), wherein x is the number of the ink storage blocks in the same ink storage region. In this way, once the printing plate cylinder 30 is rotated for a circle, the ink transfer roller 11 achieves one shifted ink transfer, which ensures that each time s the same image-text region 300 on the printing plate cylinder 30 is inked by a different ink storage block in the same ink storage region 110 on the ink transfer roller 11, such that the ink can be sufficiently supplied to each image-text region, thereby ensuring the qualities of the images and texts printed on the marketable securities.

For example, the printing plate cylinder 30 is rotated in a speed of 8000 nh, and lo when the ink transfer roller 11 is rotated to the work region of the printing plate cylinder 30, the ink supply mechanism 10 is driven by the first drive system to rotate at the same speed as the printing plate cylinder 30; each time the ink transfer roller 11 is rotated to the non-working region A of the printing plate cylinder 30, the ink supply mechanism 10 is driven by the first drive system (servo motor 40) to be rotated in a speed of 6000 nh; thus after a work cycle, the position for the ink transfer roller 11 of the ink supply mechanism to transfer the ink to the printing plate cylinder is illustrated in Figs. 2 and 3, which is adjusted from ink storage block a' in the ink storage region 111 to ink storage block c' in the ink storage region 111, so as to transfer the ink to the same image-text region on the printing plate cylinder 30. Thus when the ink transfer roller of the ink supply mechanism is rotated for n circles, the printing plate cylinder is rotated for m circles (of course, in the next movement cycle, the printing plate cylinder may be rotated for k circles while the ink transfer roller of the ink supply mechanism is rotated for n circles). This ensures that after being inked for multiple times by corresponding color module on the color module roller 12, each ink storage block in the same ink storage region 110 on the ink transfer roller 11 supplies the ink to the image-text region 300 on the printing plate cylinder 30, such that the inking amount of the image-text region 300 on the printing plate cylinder 30 is ensured, thereby ensuring the printing quality Therefore, the present invention overcomes the defect that the known structure requires the diameter ratio between the printing plate cylinder and the ink transfer roller to be a non-integer, and the outer surface perimeter of the ink transfer roller to be an integral multiple of the common divisor of the bill width, otherwise the shifted ink transfer cannot be achieved. The known structure must replace the entire cylinder including the color module roller, the ink transfer roller and the number cylinder when a product of different intervals between the numbers (image-text regions) is to be printed.

In the present invention, the ink supply mechanism 10 is driven by the first drive system, for example, the color module roller 12 is driven by the servo motor 40, while the printing plate cylinder 30 is driven by another drive system, such that the ink transfer roller 11 can flexibly regulate the speed, and adjust the shift interval according to interval B between the color modules of the color module group. As a result, after being inked for multiple times by the color module on the color module roller 12, each ink storage block in the same ink storage region on the ink transfer roller 11 supplies the ink to the image-text region 300 on the printing plate cylinder 30, such that sufficient ink is supplied to the image-text region 300, thereby improving the presswork quality. When the presswork is replaced (i.e., the interval between the image-text regions on the printing plate cylinder 30 is changed), the present invention only needs to change the size and interval of the color modules in the color module group on the outer circumferential surface of the color module wheel, and at the same time changing the predetermined shift interval by modifying the drive control system, without replacing the color module roller, the ink transfer roller or the printing plate cylinder, which saves the time and the production cost, and improves the production efficiency of the printing equipment, thereby meeting different printing requirements of different presswork.

The printing plate cylinder 30 herein is, but not limited to, a letterpress cylinder.

The above descriptions are just exemplary embodiments of the present invention, rather than limitations to the scope of the present invention. Any equivalent changes and mod ifications made by a person skilled in the art without deviating from the conception or principle of the present invention shall fall within the protection scope of the present invention. To be noted, various constituent pads of the present invention are not limited to the above general applications, while one or combinations of the technical features described in the Specification of the present invention may be selected upon the actual demand. Therefore, the present invention certainly covers other combinations and specific applications related to the inventive ideas of the present application,

Claims

CLAIMS1. An ink transfer and supply method, in which an ink supply mechanism and a printing plate cylinder are driven by a first drive system and a second drive system independent from each other, respectively, wherein each group of ink supply mechanism at least comprises an ink feed device, a color module roller and an ink transfer roller; the ink transfer roller is connected to a printing plate cylinder; within specified time, the printing plate cylinder is rotated in a constant speed, while the ink transfer roller can move in a variable speed relative to the printing plate cylinder, such that the ink transfer roller shifts by a specified interval relative to the ink transfer position of the printing plate cylinder.
2. The ink transfer and supply method according to claim 1, wherein the outer circumferential surface of the color module roller is provided with at least one color is module group, each color module group is at least composed of two color modules, and the respective color modules have the same shape and interval therebetween.
3. The ink transfer and supply method according to claim 2, wherein after the color module roller transfers the ink to the ink transfer roller, ink storage regions corresponding to the color module groups on the color module roller in size and interval therebetween are formed on the ink transfer roller, and each ink storage region is composed of ink storage blocks having the same size and interval therebetween as the color modules of corresponding color module group; and the ink storage regions on the ink transfer roller are corresponding to image-text regions provided on the printing plate cylinder.
4. The ink transfer and supply method according to claim 3, wherein when the printing plate cylinder is rotated to its working position to be opposite to the ink transfer roller, the color module roller and the ink transfer roller driven by the first drive system are rotated at the same speed as the printing plate cylinder driven by the second drive system; when the printing plate cylinder is rotated to its non-working position to be opposite to the ink transfer roller, the first drive system drives the color module roller and the ink transfer roller to be rotated at a larger or smaller speed than the printing plate cylinder, such that once the printing plate cylinder is rotated for a circle, the ink can be transferred to the same color zone in each image-text region at the working position by a different ink storage block in the same ink storage region on the ink transfer roller, or by a different ink storage region on the ink transfer roller.
5. The ink transfer and supply method according to claim 3 or 4, wherein a specified interval for ink transfer position shift of the ink transfer roller relative to the printing plate cylinder is an integral multiple of an interval between two adjacent ink storage blocks in the same ink storage region.
6. The ink transfer and supply method according to claim 5, wherein the specified interval for ink transfer position shift of the ink transfer roller relative to the printing plate cylinder is 1 to x-1 times the interval between two adjacent ink storage blocks in the H same ink storage region, wherein x is the number of the ink storage blocks in the same ink storage region.is
7. An ink transfer and supply apparatus, comprising: at least one group of ink supply mechanism, and each group of ink supply mechanism at least comprises an ink feed device, a color module roller and an ink transfer roller; the ink transfer roller is connected to a printing plate cylinder; and the ink supply mechanism and the printing plate cylinder are driven by first and second drive systems, respectively.
8. The ink transfer and supply apparatus according to claim 7, wherein the diameters of the color module roller and the ink transfer roller are equal to or integral multiples of each other.
9. The ink transfer and supply apparatus according to claim 7 or 8, wherein the color module roller is composed of a central shaft and at least one color module wheel provided thereon, and the outer circumferential surface of each color module wheel is provided with at least one color module group.
10. The ink transfer and supply apparatus according to claim 8, wherein each of the color module groups is at least composed of two color modules having the same shape and interval therebetween.
11. The ink transfer and supply apparatus according to claim 10, wherein after the color module roller transfers the ink to the ink transfer roller, ink storage regions corresponding to the color module groups on the color module roller in size and interval therebetween are formed on the ink transfer roller, and each ink storage region is composed of ink storage blocks having the same size and interval therebetween as the color modules of corresponding color module group.
12. The ink transfer and supply apparatus according to claim 7 or 8, wherein after the color module roller transfers the ink to the ink transfer roller, ink storage regions corresponding to the color module groups on the color module roller in size and interval therebetween are formed on the ink transfer roller, and each ink storage region is composed of ink storage blocks having the same size and interval therebetween as the color modules of corresponding color module group; and the ink storage regions on the ink transfer roller are corresponding to image-text regions provided on the printing plate cylinder,
13. The ink transfer and supply apparatus according to claim 7, wherein the surface of the ink transfer roller is made of an elastic material having a shore hardness in a range from 30 to 45; and the surface of the color module roller is made of a hard material.
14. The ink transfer and supply apparatus according to claim 13, wherein the elastic material is a rubber layer or a polyester layer; and the hard material is a nylon plate or a metal plate.
15. A printing equipment, comprising the ink transfer and supply apparatus according to any of claims 7 to 13, wherein the ink supply mechanism is driven by a first drive system, while the printing plate cylinder and the impression cylinder are driven by a second drive system.