GB2512238A

GB2512238A - Associated printing apparatus

Info

Publication number: GB2512238A
Application number: GB1411525.7A
Authority: GB
Inventors: Ming Bi; Fangjian Li; Yanping Li; Xudong Du; Chuan Wang
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: 2012-05-09
Filing date: 2012-05-09
Publication date: 2014-09-24
Anticipated expiration: 2032-05-09
Also published as: CH706783B1; CN103547454B; DE112012006348T5; CN103547454A; GB201411525D0; JP5897738B2; AT516936B1; DE112012006348B4; WO2013166672A1; JP2015513479A; AT516936A1; GB2512238B

Abstract

An associated printing apparatus (100) is disclosed. The printing apparatus (100) comprises a screen printing unit (4), an orientation unit (2) for an inked magnetic sheet, a relief printing unit (1), and at least a set of ink light-cure unit (3). The screen printing unit (4), the orientation unit (2) for and inked magnetic sheet and the relief printing unit (1) are arranged in order. The connection among the said units is implemented by a sheet transferring system. Since the units are located in one printing apparatus, the sheet only needs to be transferred once to finish such procedures as screen printing, magnetic orientation, and relief printing in succession, thereby reducing the manufacturing cost. Compared to the production with single machine, the associated printing apparatus (100) occupies a smaller area and enables a shorter production line.

Description

A COMBINED PRINTING APPARATUS

Field of the Invention

The present invention relates to a combined printing apparatus for secure files (particularly marketable securities), which can achieve a combined printing using three printing technologies, i.e., screen printing, presswork magnetic orientation and letterpress printing, through one time of printing.

Background of the Invention

Most of the existing security printing equipments can only perform a printing using one printing technology. For example, the sheet-fed single-side rotary screen-plate printing equipment can only perform a printing using the screen printing technology, and the letterpress printing equipment can only perform a printing using the letterpress printing technology. When the presswork needs to be printed using multiple printing technologies, different printing equipments of simplex technology are used for printing successively. Thus, one production line is provided with a certain number of printing equipments of different technologies which can respectively achieve screen printing, letterpress printing, etc. Since all kinds of equipments are equipped with a sheet delivery device respectively, the production line is long and the workshop occupies a large area, so the production cost is increased.

The Chinese patent No. 200410084389.9 discloses a sticky rotary printing machine composed of a paper feeding section, a paper collecting device, a screen printing section and a satellite letterpress printing section, etc., wherein a screen printing unit is coordinated with a letterpress printing machine, but a comprehensive printing using three printing technologies, i.e., screen printing, presswork magnetic orientation and letterpress printing, cannot be achieved through one time of paper pass.

The Chinese patent No. 200880005435.8 discloses a "cylinder body for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate". The known cylinder body 10 having magnetic field generating devices has a determinate position relative to the shaft member in the circumferential direction, and they rotate synchronously. Thus, a sheet will always be in an absorbed state when it is delivered to the cylinder body 10, and particularly, it is absorbed on the cylinder body even in the sheet handover process. Thus, when a sheet transfer system of the known cylinder body 10 having magnetic field generating devices performs a sheet handover with a sheet transfer system of other cylinder or device, the adsorption force of the cylinder body 10 will influence the accuracy and stability of the sheet handover in a certain extent. Thus in the known structure, the sheet handover between cylinders is unstable and the accuracy is low during continuous production operation, and the quality of the presswork is influenced. Thus the cylinder body 10 of the known structure is more suitable for the printing equipment as illustrated in Fig. 13 which has no sheet handover Furthermore, in the known structure, although the suction hole in the center shaft of the magnetic orientation cylinder can switch the suction and non-suction functions by being selectively inserted with an element, such arrangement shall be made in appropriate time, thus its structure is relatively complex and the labor intensity in production is increased. In addition, the axial position of the magnetic field generating device in the known art is not adjustable on the annular support, and only the mounting position of the annular support can be adjusted in the axial direction of the center shaft, which largely restricts the flexibility of the position adjustment of the magnetic field generating device. H Since the screen presswork has a thick ink layer, it needs to be dried so as to ensure the quality of the presswork. In existing screen printing equipments, the presswork is usually dried through a combination of hot air drying and infrared drying/UV drying. But the combined drying uses a long drying path, which not only occupies a large space of the equipment, but also causes a problem that the presswork quality is influenced when the presswork cannot be dried in time. For this reason, an apparatus for baking ink on sheet surfaces with ultraviolet light has been developed. In the drying process, the printing cylinder having a cooling function is required to cool the sheet surface at the same time of drying, so as to improve the sheet security in the drying process. For example, in an "Ultraviolet and Infrared Two-Selecting Drying Apparatus of Printer" disclosed in the Chinese patent No. 200820009427.8, a cool-type transfer flat roll is described, which is provided at a lower portion of an ultraviolet light box and which is hollow inside. The cooling water is transferred to the cavity of the cool-type transfer flat roll through the water pipe and the rotary valve assembly. When the sheet is dried with the ultraviolet light box, in order to prevent the film sheet from a shrinkage distortion under high temperature of the ultraviolet light box, the rotary valve assembly is opened, and the cool-type transfer flat roll is filled with cool water inside, so as to absorb the heat from the sheet surface.

The printing process is a complex process, and the known structure of the cool-type transfer flat roll only cools the sheet surface. However, when the cool-type transfer flat roll cannot engage with other paper delivery cylinder, the sheet floats on the surface of the transfer flat roll, thus the sheet is unstable in the delivery process. For example, in the delivery process, the tail of the sheet may drift, and different parts of the sheet cannot be kept in the same plane, etc..

In conclusion, for the printing houses which have a large product volume and mainly use comprehensive technologies, the current production lines of existing printing apparatuses and equipments can only be provided with the equipments of simplex or two combined printing technologies. As a result, the expenses of investment and management for the equipment are high, the production cycle is long, and many human labors are required. In addition, the maintenance expense is increased, thus the production cost is high and the market competitiveness is influenced. Moreover, the screen printing requires a huge drying system, thus the existing printing apparatuses of comprehensive technologies further have a defect that the production lines and the storehouses occupy large areas.

is In view of the above defects of the known arts and according to the production and design experiences of many years in this and related fields, the inventor has developed a combined printing apparatus of the present invention, which achieves three printing technologies, i.e., screen printing, presswork magnetic orientation and letterpress printing, and solves the problems that during the sheet handover between various printing units, the printed image and text may be set-off, the sheet needs to be turned over, and the delivery path shall be as short as possible, etc.. That is, the present invention not only could meet the printing requirement and ensures the printing quality, but also greatly shortens the delivery path and reduces the equipment volume.

Summary of the Invention

An object of the present invention is to provide a rotary multi-process single-side printing apparatus, and particularly, a combined printing apparatus achieving three printing technologies (screen printing, presswork magnetic orientation and letterpress printing) through one time of printing.

Another object of the present invention is to provide a magnetic orientation cylinder meeting different presswork requirements, conveniently adjustable, simply structured, and capable of effectively improving the presswork quality.

Still another object of the present invention is to provide a drying paper delivery cylinder for adsorbing and cooling sheets in the process of printing a sheet-like paper or a web-like paper.

Therefore, the present invention proposes a combined printing apparatus comprising: at least one group of ink photo-curing units; and a screen printing unit, an ink magnetic base magnetic orientation unit and a lefferpress printing unit which are provided in order; the units being connected to each other through a paper delivery system.

The aforementioned combined printing apparatus, wherein the ink photo-curing unit comprises a UV drying device and/or an infrared drying device, and a drying paper delivery cylinder capable of cooling and absorbing sheets; the drying paper delivery cylinder is a rotary air valve, comprising a cylinder body and a spindle, wherein the cylinder body is rotatably nested on the spindle, and an air chamber is formed between the cylinder body and the spindle; the spindle is connected to an air extracting device, and capable of extracting the air in the air chamber; the roll wall of the cylinder body is provided with a cooling passage connected to a cooling water pipe, and adsorption air holes capable of communicating with the air chamber.

The aforementioned combined printing apparatus, wherein the ink magnetic base magnetic orientation unit is a magnetic orientation cylinder, comprising: a rotary air valve having a spindle and a cylinder body rotatably nested outside the spindle, and an air chamber is formed between the cylinder body and the spindle; the spindle is connected to an air extracting device and capable of extracting the air in the air chamber; the cylinder wall of the cylinder body is provided with through holes capable of communicating with the air chamber; a plurality of annular supports axially provided outside the cylinder body, the outer circumference of each of the annular supports being embedded with a plurality of magnetic field generating devices and first adsorption holes communicated with the through holes; and a cover plate on which a plurality of second adsorption holes are uniformly distributed, the cover plate encapsulating outside the plurality of annular supports.

As compared with the prior art, the present invention has the following characteristics and advantages: The combined printing apparatus of the present invention enables the sheet to pass a paper transport section, a paper feeding cylinder, a first paper delivery cylinder, printing sections and a paper collecting section, through one time of printing, the comprehensive printing technology which uses screen printing, ink magnetic base magnetic orientation and letterpress printing can be completed on one side of a single paper, and the process from the paper transport and printing to the collection can be finished.

In one printing equipment, the present invention inputs the sheets in one time, and the comprehensive printing operation can be completed through the continuous screen printing, magnetic orientation and letterpress printing, then the finished products are S delivered to the paper collecting section. Thus, as compared with the prior art, the present invention can greatly shorten the production cycle, decrease the equipment investment, save the areas occupied by the production and storehouse, and reduce the human labor. The present invention is applicable, but not limited, to the safe printing of F the secure certificates and the marketable securities The present invention adopts a single drying form of UV drying or infrared drying, or a combined drying form of UV drying and infrared drying, to dry the presswork, i.e., the drying path of the ink photo-curing unit in the present invention is relatively short, and the presswork quality can be easily ensured, and particularly for the presswork pattern having been magnetically orientated, it is especially important to dry it in time. In the process of presswork drying, the present invention delivers the presswork through the drying paper delivery cylinder, of which the sheet adsorption function makes the presswork be delivered more stably and smoothly in the drying process, and the cooling passage provided thereon can cool the sheet surface while ensuring a stable sheet delivery, thereby particularly when the sheet is dried, effectively decreasing the sheet surface temperature, reducing the sheet moisture loss, avoiding the sheet shrinkage distortion, and ensuring the drying effect and security of the presswork.

In addition, both the drying paper delivery cylinder and the magnetic orientation cylinder of the present invention use the structure of a rotary air valve, which divides the region in the circumferential working range of the drying paper delivery cylinder and the magnetic orientation cylinder into a region having adsorption function and a region having no adsorption function, so that the suction and non-suction functions can be freely switched from each other. As compared with the prior art, the present invention is simple in structure, and through a reasonable arrangement of the handover position between the cylinders, it ensures that the presswork handover process is always performed in the region having no adsorption function, thereby eliminating the presswork handover error and improving the presswork handover stability. In addition, by virtue of the adsorptive force on the cylinder surface, the unstable factors in the presswork magnetization process such as sheet floating are reduced, and the presswork pattern magnetic orientation quality is improved.

S H

In addition, both the drying paper delivery cylinder and the magnetic orientation cylinder of the present invention are provided with at least one group of gripper bars for sheet handover and delivery in the process of presswork drying or magnetic orientation, thereby ensuring the quality of the presswork magnetic orientation pattern.

s The screen plate cylinder of the present invention uses the independent servo drive control technique, such that the screen plate cylinder does not need to idles with the host machine when no printing is performed, and the non-image-text portion of the screen cylinder stops right below the cylinder in time after a throw-off. Thus ink leakage and shedding of the screen plate cylinder can be avoided in a large extent, and the wastes produced in a startup after shutdown can be reduced.

In the present invention, after the screen printing, a sheet needs to be delivered between the second paper delivery cylinder, the magnetic orientation cylinder and the third paper delivery cylinder and then to the drying unit. In order to prevent the printed image or text from being set-off, the second paper delivery cylinder and the third paper is delivery cylinder of the present invention use the cushion cylinders, such that in the delivery process the sheet is always attached to the cushions under the negative pressure, and the image-text side and non-image-text side of the sheet never contact the cylinder, thereby ensuring the security of avoiding the image-text set-off.

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 structure principle diagram of a combined printing apparatus according to the present invention; Fig. 1A is a structure principle diagram of another embodiment of a combined printing apparatus according to the present invention, wherein a paper delivery system uses a chain paper delivery mechanism; Fig. 2 is a structure principle diagram of a magnetic orientation cylinder in an ink magnetic base magnetic orientation unit according to the present invention; Fig. 3 is a sectional schematic diagram along line M-M in Fig. 2; Fig. 3a is a partial enlarged diagram of H in Fig. 3; Fig. 3b is a partial enlarged diagram of J in Fig. 3; Fig. 4 is a structure schematic diagram of the structure of an annular support in a magnetic orientation cylinder and its connection to a cylinder body according to the present invention, wherein parts provided in the cylinder body are not shown; Fig. 5 is a structure schematic diagram of a magnetic field generating device according to the present invention; Fig. 6 is a sectional schematic diagram along line B-B in Fig. 5; Fig. 7 is a structure schematic diagram of a spindle of a rotary air valve of a magnetic orientation cylinder according to the present invention; Fig. 8 is a structure schematic diagram of an ink photo-curing unit of a combined printing apparatus according to the present invention; Fig. 9 is a structure principle diagram of a drying paper delivery cylinder of an ink photo-curing unit according to the present invention; Fig. 10 is a sectional schematic diagram along line D-D in Fig. 9; Fig. 11 is a structure schematic diagram of a spindle of a drying paper delivery cylinder according to the present invention; Fig. 12 is a sectional schematic diagram along line C-C in Figs. 7 and 11; and I 5 Fig. 13 is a side view of a known printing machine with magnetic orientation cylinder.

Detailed Description of the Preferred Embodiments

The present invention provides a combined printing apparatus, comprising at least one group of ink photo-curing units; and a screen printing unit, an ink magnetic base magnetic orientation unit and a letterpress printing unit which are provided in order; the units being connected to each other through a paper delivery system. In a printing equipment, the present invention inputs the sheets in one time, and the comprehensive printing operation can be completed through the continuous screen printing, magnetic orientation and letterpress printing, then the finished products are delivered to the paper collecting section. Thus, as compared with the prior art, the present invention can greatly shorten the production cycle, decrease the equipment investment, save the areas occupied by the production and storehouse, and reduce the human labor. The present invention is applicable, but not limited, to the safe printing of the secure certificates and the marketable securities.

In order to more clearly understand the technical features, objects and effects of the present invention, the specific embodiment, structures, features and effects of the combined printing apparatus of the present invention will be detailedly described as follows with reference to the drawings and preferred embodiments. In addition, through the descriptions of the specific 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.

Fig. 1 is a structure principle diagram of a combined printing apparatus according to the present invention. As illustrated in Fig. 1, the combined printing apparatus 100 of the present invention includes: at least one group of ink photo-curing units 3; and a screen printing unit 4, an ink magnetic base magnetic orientation unit 2 and a letterpress printing unit 1 which are provided in order; the units being connected to each other through a paper delivery system. In which, the paper delivery system includes a paper delivery cylinder and/or a chain paper delivery mechanism.

In the combined printing apparatus of the present invention one or two ink photo-curing units 3 may be provided.

When just one ink photo-curing unit 3 is used, it may be provided in front of the letterpress printing unit 1, i.e., being located between the ink magnetic base magnetic orientation unit and the letterpress printing unit 1. The ink photo-curing unit 3 may also be provided behind the letterpress printing unit 1, i.e., being located between the Ietterpress printing unit 1 and a paper-out cylinder 107.

Two ink photo-curing units 3 are provided in the specific embodiment as illustrated in Fig. 1, i.e., one of the ink photo-curing units 3 is provided in front of and behind the letterpress printing unit 1, respectively. As illustrated in Fig. 1, in the specific solution, the screen printing unit 4 includes a screen impression cylinder 114, and at least one group of screen plate cylinders 115 contacted with the screen impression cylinder 114. The letterpress printing unit 1 includes a letterpress impression cylinder 106, and at least one group of letterpress cylinders 103 contacted with the letterpress impression cylinder 106.

The ink magnetic base magnetic orientation unit is constructed by magnetic orientation cylinder 20. The ink photo-curing unit 3 includes a UV drying device 110, and a drying paper delivery cylinder 30 capable of cooling and absorbing sheets. The magnetic orientation cylinder 20 and one of the two drying paper delivery cylinders 30 are provided between the screen impression cylinder 114 and the letterpress impression cylinder 106, and the other drying paper delivery cylinder 30 is provided between the letterpress impression cylinder 106 and the paper-out cylinder 107.

A second paper delivery cylinder 113 is provided between the screen impression cylinder 114 and the magnetic orientation cylinder 20. A third paper delivery cylinder 111 is provided between the magnetic orientation cylinder 20 and the drying paper delivery cylinder 30. A fourth paper delivery cylinder 108 is provided between the drying paper delivery cylinder 30 and the letterpress impression cylinder 106.

As illustrated in Fig. 1A, in a feasible technical solution, the ink photo-curing unit 3 is only provided between the ink magnetic base magnetic orientation unit and the letterpress printing unit 1. In addition, a chain paper delivery mechanism 108' is provided between the drying paper delivery cylinder 30 and the letterpress impression cylinder 106. Other structures are the same as those in the solution illustrated in Fig. 1, and herein are omitted.

Next, descriptions are given through an example where the fourth paper delivery cylinder 108 is provided between the drying paper delivery cylinder 30 and the letterpress impression cylinder 106.

In a preferred embodiment, the second paper delivery cylinder 113, the third paper delivery cylinder 111 and the fourth paper delivery cylinder 108 are all cushion cylinders.

When a sheet arrives at the paper delivery cushion cylinder, the cushion cylinder blows Is air toward the sheet to form a negative pressure between the sheet and the inner surface of the cylinder, so that the non-image-text side of the sheet is attached to the inner surface of the paper delivery cylinder under the negative pressure, thereby avoiding the image-text set-off on the sheet.

Fig. 2 is a structure principle diagram of a magnetic orientation cylinder in an ink magnetic base magnetic orientation unit according to the present invention; Fig. 3 is a sectional schematic diagram along line M-M in Fig. 2; Fig. 3a is a partial enlarged diagram of H in Fig. 3; Fig. 3b is a partial enlarged diagram of J in Fig. 3; Fig. 4 is a structure schematic diagram of the structure of an annular support in a magnetic orientation cylinder and its connection to a cylinder body according to the present invention, wherein parts provided in the cylinder body are not shown; Fig. 5 is a structure schematic diagram of a magnetic field generating device; Fig. 6 is a sectional schematic diagram along line B-B in Fig. 5; Fig. 7 is a structure schematic diagram of a spindle of a rotary air valve of a magnetic orientation cylinder according to the present invention; and Fig. 12 is a sectional schematic diagram along line C-C in Figs. 7 and 11.

As illustrated in Figs. 2 to 4, the magnetic orientation cylinder 20 includes a rotary air valve 21, an annular support 22 and a cover plate 23. In which, the rotary air valve 21 includes a spindle 211 and a cylinder body 212 rotatably nested outside of the spindle 211, and an air chamber 213 is formed between the cylinder body 212 and the spindle 211; the spindle 211 is connected to an air extracting device, and it can extract the air in the air chamber 213. The cylinder wall of the cylinder body 212 is provided with through hole 2121 communicated with the air chamber 213, wherein as illustrated in Fig. 2, the two ends of the spindle 211 are provided with bearings 241, 242 through which the cylinder body 212 is rotatably connected to the spindle 211. A plurality of annular supports 22 are provided outside the cylinder body 212 along the axial direction and spaced from each other in a certain distance L. The outer circumference of each of the annular supports 22 is embedded with a plurality of magnetic field generating devices 221, and a first adsorption hole 222 communicated with the through hole 2121. A plurality of second adsorption holes are uniformly distributed on the cover plate 23 that encapsulates the outside of the plurality of annular supports 22. The smoothness of the sheet surface in the delivery process is improved by providing the cover plate 23.

Referring to Fig. 3 together, an optional solution is that on the cylinder body 212, a plurality of through holes 2121 are provided in the axial direction, and preferably, the through holes 2121 are uniformly distributed in the lengthwise direction of the cylinder is body 212, so that the presswork is stably adsorbed on the cover plate 23 outside the magnetic orientation cylinder.

Further referring to Figs. 3, 3b and 4, two keyways 2122, 2123 are provided in the axial direction on the outer circumference of the cylinder body 212. A plurality of connecting keys 2124 of a number identical to and a width corresponding to those of the annular supports 22 are provided in the keyways 2122, 2123, and the annular supports 22 and the connecting keys 2124 are connected through connecting bolts 28, so as to fix the axial and circumferential positions of the annular supports 22 on the outer circumference of the cylinder body 212, and adjust the axial positions.

In which, the keyways 2122, 2123 preferably are T-shaped slots, and two rectangular grooves 223, 224 are provided on the inner circumferential walls of the annular supports 22 at the positions corresponding to the T-shaped slots. The connecting key 2124 is a 1-shaped key fitted with the T-shaped slot, the width of the rectangular grooves 223, 224 in the circumference direction is matched with the width of a vertical end of the T-shaped key, and the vertical end of the T-shaped key is embedded into the rectangular grooves 223, 224 of the annular supports 22, thereby circumferentially limiting the annular supports 22. In the present invention, by tightening connecting bolts 28, the upper surfaces of the two horizontal ends of the T-shaped connecting key 2124 abut against the 1-shaped keyways 2122, 2123, and the annular supports 22 are axially fixed by means of a friction force between the connecting key 2124 and the keyway. When the annular supports 22 need to be axially moved, the connecting bolts 28 are loosened, so that the connecting key 2124 goes away from the contact with the keyways 2122, 2123. next, the connecting key 2124 and the annular supports 22 are axially moved together in the keyways to new positions, and then the connecting bolts 28 are tightened again, thus the annular supports 22 can be conveniently fixed.

Further, the annular support 22 includes a support ring 225 and a pressing plate 226 which are firmly connected to each other through a screw. In which, the support ring 225 are provided with annular grooves 2251 at both sides thereof, in which the magnetic field generating device 221 is provided in the annular groove 2251, and respective magnetic field generating devices 221 are fixed to the corresponding support rings 225 through the pressing plate 226 and a plurality of set screws 227. As illustrated in the drawings, the end of the set screw 227 abuts against the magnetic field generating device 221. The magnetic field generating device 221 may be fixed to a specified position by tightening is the set screw 227; on the contrary, the circumferential position of the magnetic field generating device 221 on the support ring can be adjusted by loosening the set screw 227; thus the circumferential position of the magnetic field generating device 221 on the annular support 22 can be adjusted through the set screw 227, so as to meet the requirement of presswork of different specifications. As illustrated in Fig. 4, in a preferred embodiment, the support ring 225 are provided with the annular groove 2251 at both sides thereof, a shaft shoulder 2252 is formed between the two annular grooves 2251, a plurality of magnetic field generating devices 221 are uniformly distributed in each of the annular grooves 2251, and both the annular groove 2251 and the shaft shoulder 2252 are provided with the first adsorption hole 222.

Further, as illustrated in Fig. 3, the inner wall of the annular support 22 is axially provided with grooves 228, which are corresponding to the through holes 2121 of the cylinder body 212 and communicated with each of the first adsorption holes 222. By providing the grooves 228, it can ensure that the first adsorption holes 222 and the through holes 2121 of the cylinder body 212 are always in a through state when the annular support 22 moves in the axial direction.

As illustrated in Figs. 3b and 4, in another feasible embodiment, the pressing plate 226 may be provided with a recess snap-fitted with the connecting key 2124. The connecting bolt 28 is connected to the connecting key 2124 through the pressing plate 226, so as to fix the pressing plate 226 to the side of the support ring 225. In addition, the Ii upper surfaces of the two horizontal ends of the T-shaped connecting key 2124 abut against the T-shaped keyways 2122, 2123 by tightening connecting bolts 28, and the annular support 22 is axially fixed by means of a friction force between the connecting key 2124 and the keyways. In the structure, the axial adjustment of the annular support 22 has been described before, and herein is omitted.

Further, referring to Figs. 3, 5 and 6, the magnetic field generating device 221 includes a magnetic block carrier 2211, a magnetic element 2212 and a base plate 213.

The magnetic element 2212 is accommodated in the magnetic block carrier 2211. The base plate 2213 closes the magnetic element 2212 in the magnetic block carrier 2211.

The magnetic block carrier 2211 and the base plate 2213 are fixed to each other through a screw. The magnetic block carrier 2211, the base plate 2213 and the cover plate 23 are all made of weakly magnetic materials or non-magnetic materials.

In a feasible solution, one end of the cover plate 23 is fixedly connected to the annular support 22, and the other end is adjustably fixed in a gripping section 25. The gripping section 25 is connected to the annular support 22 and moveable in the circumferential direction thereof, so as to tension the cover plate 23.

Further, as illustrated in Figs. 3 and 3a, the gripping section 25 further includes a pair of upper and lower pressing plates 251, 252. The other end of the cover plate 23 is fixed between the upper and lower pressing plates 251, 252 which are provided in an elongated slot formed at one end of the annular support 22, and the lower pressing plate of the gripping section 25 is fixedly connected to the annular support 22 through a fastening bolt 261. When the annular support 22 or other part needs to be adjusted, the tensioning force of the cover plate 23 is decreased by loosening the fastening bolt 261, or the cover plate 23 goes away from the gripping of the upper and lower pressing plates by screwing out the positioning bolt 262. When the cover plate 23 is to be tensioned, the lower pressing plate 252 is strained toward the end of the annular support 22 by adjusting the fastening bolt 261, so as to strain the cover plate 23.

Referring to Figs. 7 and 12 in coordination, the spindle of the magnetic orientation cylinder is axially provided with a hollow air passage 2111 that is usually arranged coaxially with the spindle 211. The sidewall of the spindle 211 is provided with a plurality of air holes communicated with the air passage 2111. Both outer ends of the spindle 211 are provided with an annular shoulder 2113 respectively The annular shoulder 2113, the inner wall of the cylinder body 212, and the spindle 211 constitute the air chamber 213, and through the air hole 2112, the air in the air chamber 213 can be extracted. 12 H

In order that the presswork adsorbed on the magnetic orientation cylinder can be handed over stably to the next cylinder to eliminate the presswork handover error, one feasible solution is that two radially protruding air chamber partition boards 271, 272 are further fixed in the lengthwise direction outside the spindle 211. The two air chamber partition boards 271, 272 divide the circumferential hollow portion between the spindle 211 and the cylinder body 212 into two spaces, one of which is an air chamber 213. In the space within the air chamber 213, the spindle 211 is provided with an air hole 2112 communicated with the air passage 2111. In which, the through hole 2121 on the cylinder body 212 of the magnetic orientation cylinder is preferably provided in a section corresponding to the air chamber 213. Since the first adsorption hole 222 of the annular support 22 is communicated with the through hole 2121, and the cover plate 23 is uniformly distributed with the second adsorption holes thereon, it is clear that in the process of a relative rotation between the cylinder body 212 and the spindle 211, the surface of the magnetic orientation cylinder 20 can switch the adsorption and non-adsorption functions.

Referring to Figs. 7 and 12 together, in order to achieve a more stable connection between the air chamber partition boards 271, 272 and the spindle 211, preferably two groups of corresponding grooves 2114, 2115 are provided in the radial direction on opposite inner sides of the two shoulders 2113, respectively. The two air chamber partition boards 271, 272 are embedded in the grooves 2114, 2115, respectively, and fixedly connected to the spindle 211 through screws. The cylinder body 212, the two shoulders 2113 of the spindle 11 and the two air chamber partition boards 271, 272 form the air chamber 213.

Further, the shoulder 2113, each of the air chamber partition boards 271, 272 and the cylinder body 212 form a clearance fitting, i.e., the outer diameter of the shoulder 2113, and the distance from the outer end surface of each of the air chamber partition boards 271, 272 to the center of the cylinder body 212 are slightly smaller than the inner diameter of the cylinder body 212, so that the cylinder body 212 is freely rotatable on the spindle 211, without any friction interference with the air chamber partition board. In order to achieve the above object, when the air chamber partition boards are fixed to the spindle 211, preferably each of the air chamber partition boards 271, 272 is set to have a clearance of 0.lmm-4mm between its outer end surface and the inner wall surface of the cylinder body 212, and the shoulder 2113 also has a clearance of 0.lmm-4mm between its outer circumferential surface and the inner wall surface of the cylinder body 212.

As illustrated in Fig. 3, two air chamber partition boards 271, 272 divide the rotary air valve 21 into a space having adsorption function (air chamber 213) and a space having no adsorption function. In which, since the spindle 211 is not provided with any air hole 2112 in section A, the section A forms the space having no adsorption function. In the section of included angle a (360°-A), since the spindle 211 is provided with the air hole 2112, the space having adsorption function is formed in this section, that is, this space is formed as the air chamber 213. That is, in the rotation process of the cylinder body 212, when the through hole 2121 provided thereon enters the air chamber 213, the annular support 22 corresponding to that portion of cylinder body 212 obtains the adsorption function; and when the cylinder body 212 is rotated such that the through hole 2121 provided thereon goes away from the air chamber 213 and enters the section A, the annular support 22 corresponding to that portion of cylinder body 212 loses the adsorption function.

The working principle of the magnetic orientation cylinder 20 is that the spindle 211 does not rotate, and the cylinder body 212 is driven to be rotated by a drive system, e.g.1 through a gear drive. In the rotation process of the cylinder body 212, when the through bole 2121 of the cylinder body 212 is corresponding to the section A between the two air chamber partition boards 271, 272, the magnetic orientation cylinder 20 does not have the adsorption function since the spindle 211 has no air hole 2112 thereon in the section.

When the cylinder body 212 is rotated such that the through hole 2121 provided thereon enters the air chamber 213 (i.e., section 360°-A) between the two air chamber partition boards 271, 272, the second adsorption hole on the cover plate 23, the first adsorption hole 222 of the annular support 22, and the through hole 2121 on the cylinder body 212 are communicated in order, and the air extracting device extracts air from the surface of the magnetic orientation cylinder 20 through the air passage 2111 and the air hole 2112 of the spindle and the air chamber 213, such that the surface of the magnetic orientation cylinder 20 has the adsorption function. When the circumference surface of the cylinder body 212 having the through hole 2121 in the rotary air valve 1 entirely enters the section 360°-A between the two air chamber partition boards 271, 272, that part of surface of the cylinder body 212 has the strongest adsorption force, i.e., the magnetic orientation cylinder 20 achieves the maximum adsorption capability. With the rotation of the cylinder body 2121, the magnetic orientation cylinder 20 switches between two states of having and not having the adsorption function. Through the structure of the rotary air valve, the magnetic orientation cylinder ensures the stability of the presswork handover, reduces the unstable factors in the presswork magnetization process such as sheet drift, and improves the quality of the presswork pattern magnetic orientation.

Moreover, in the magnetic orientation cylinder, when the axial and circumferential s positions of the magnetic field generating device 221 of the annular support 22 need to be adjusted according to the layout of the presswork, on one hand, since the annular supports 22 are spaced from each other in a certain distance L (see Fig. 2), and each annular support 22 is fixedly connected to the cylinder body through the friction force generated between the connecting key 2124 and the keyway, the fixation between the o connecting key 2124 and the keyway 2122, 2123 can be cancelled by loosening the connecting bolt 28 which connects the annular support 22 with the connecting key, so that the connecting key 2124 and the annular support 22 axially move together in the keyway, thereby performing the axial adjustment of the magnetic field generating device 221, and achieving the purpose of adjusting the axial position of the magnetic field Is generating device 221. On the other hand, since the magnetic field generating device 221 is fixed in the annular groove 2251 of the annular support 22 through the pressing plate 226 and the set screw 227, when the circumferential position of the magnetic field generating device 221 needs to be adjusted, the end surface fixation of the magnetic field generating device 221 can be cancelled by loosening the set screw 227, and the magnetic field generating device 221 is moved in the annular groove 2251 until it reaches an appropriate position, then the set screw 227 is tightened to fasten the magnetic field generating device 221, thus the circumferential position of the magnetic field generating device 221 can be conveniently adjusted.

Fig. 9 is a structure principle diagram of a drying paper delivery cylinder of an ink photo-curing unit according to the present invention; Fig. 10 is a sectional schematic diagram along line D-D in Fig. 9; and Fig. 11 is a structure schematic diagram of a spindle of a drying paper delivery cylinder according to the present invention.

As illustrated in Figs. 9 and 11, the drying paper delivery cylinder 30 includes a cylinder body 31 and a spindle 32. The cylinder body 31 is a hollow cylinder rotatably nested on the spindle 211. Both ends of the spindle are provided with an annular shoulder 323 respectively. An air chamber 33 is formed between the cylinder body 31 and the two shoulders 323 of the spindle 32. As illustrated in Fig. 9, in this embodiment, the cylinder body 31 is supported on the spindle 32 through bearings 341, 342. One end of the spindle 32 is closed, and the other end is open, i.e., the spindle 32 is axially provided with a hollow air passage 321. The spindle is connected to the air extracting device, and extracts the air in the air chamber 33 via a plurality of air holes 322 which are provided on the spindle 32 and communicated with the air passage 321. In addition, the roll wall of the cylinder body 31 is provided with a cooling passage 311 connected to a cooling water circulation system, and adsorption air holes 312 communicated with the air chamber 33.

Referring to Fig. 10 in coordination, an optional solution is to axially provide the cooling passage 311 on the roll wall of the cylinder body 31. In order to uniformly cool the whole sheet in the delivery process, preferably a plurality of cooling passages 311 are 0 uniformly and circumferentially distributed on the roll wall of the cylinder body 31 in a certain interval, and the plurality of the cooling passages are connected in serials with each other. In which, one end of a cooling passage 311 is connected to the water inlet 38, and one end of another cooling passage is connected to a water outlet (not illustrated).

Another optional solution is that the cylinder body 31 is axially provided with a plurality of adsorption air holes 312 arranged radially. Referring to Figs. 9 and 10 in coordination, the adsorption air holes 312 are arranged between two adjacent cooling passages 311, and the adsorption air holes 312 are uniformly distributed in the lengthwise direction of the cylinder body 31, so that the sheet is stably adsorbed on the drying paper delivery cylinder.

In the process of printing a sheet-like paper or a web-like paper, the drying paper delivery cylinder of the present invention can adsorb the sheet on the cylinder surface, so that the sheet is stable during the delivery. In addition, the sheet can be effectively cooled through the cooling passage 311 provided in the cylinder body, so as to efficiently decrease the temperature of the sheet surface.

Moreover, in order that the sheet adsorbed on the drying paper delivery cylinder can be handed over stably to the next cylinder to eliminate the sheet handover error, one feasible solution is that two protruding air chamber partition boards 361, 362 are fixed in the radial direction of the spindle 32. The two air chamber partition boards 361, 362 divide the portion between the cylinder body 31 and the spindle 32 into two spaces, one of which is an air chamber 33. In the space within the air chamber 33, the spindle 32 is provided with air holes 322 communicated with the air passage 321. On the cylinder body 31, the adsorption air holes 312 are provided in a section corresponding to the air chamber 33. The circumference of the cylinder body 31, except the range for mounting the gripper bar 5, is uniformly provided with the adsorption air holes 312. The included angle a between the two air chamber partition boards 361, 362 is determined by the sheet handover position. Thus in the rotation process of the cylinder body 31, when the adsorption air hole 312 provided thereon enters the air chamber 33, that portion of cylinder body 31 obtains the sheet adsorption function; and when the cylinder body 31 is rotated such that the adsorption air holes 312 provided thereon go away from the air chamber 33, the cylinder body 31 loses the adsorption function. In which, the fitting relationships between the air chamber partition boards 361, 362 and the spindle 32, the cylinder body 31 are the same as those in the structure of the magnetic orientation cylinder, and herein are omitted.

Fig. 8 is a schematic diagram of the working condition of a specific embodiment of the drying paper delivery cylinder. In that case, the gripper bar 5 is located in a range outside the air chamber 33, and the cylinder body 31 applies no adsorption force to the paper thereon. The working principle of the drying paper delivery cylinder is described in H conjunction with a specific embodiment illustrated in Fig. 8. Fig. 8 illustrates a specific s embodiment of the drying paper delivery cylinder applied to the combined printing apparatus of the present invention. Correspondingly, the drying paper delivery cylinder is provided below a UV drying device 110, the third paper delivery cylinder 111 is provided on one side of the drying paper delivery cylinder 30, the fourth paper delivery cylinder 108 is provided on the other side of the drying paper delivery cylinder 30, and the rotation direction of each cylinder is indicated by the arrows in the drawing. In this embodiment, the sheet is transferred to the drying paper delivery cylinder 30 by the third paper delivery cylinder 111, dried by the drying device 110, and delivered to the fourth paper delivery cylinder 108 by the drying paper delivery cylinder 30, thereby being sent out of the drying means.

The drying paper delivery cylinder 30 is composed of the cylinder body 31 and the spindle 32. A plurality of adsorption air holes 312 provided radially are uniformly and axially distributed on the circumference of the cylinder body 31. A plurality of air holes 322 are uniformly and axially distributed on the circumference of the spindle 32 within a specified range of central angle (included angle a). In which, the adsorption air holes 312 are uniformly distributed on the whole outer roll body 31 (except the position for mounting the sheet gripper bar 5), and the distribution angle of the air holes 322 on the circumference of the spindle 2 is determined by the sheet handover position. In order H that the sheet can be stably and firmly adsorbed on the surface of the cylinder body 31 during the drying process, and smoothly delivered to the third and fourth paper delivery 7 H cylinders 111, 108 to reduce the adsorption force from the cylinder body 31, two air chamber partition boards 361, 362 are fixed on the spindle 32, and the air holes 322 are provided in a range of included angle a between the two air chamber partition boards 361, 362, usually the included angle a being smaller than 3600 and larger than or equal to 1800. The space between the cylinder body 31 and the spindle 32 is divided into two parts through the two air chamber partition boards 361, 362, i.e., a space having the adsorption function (air chamber 33) and a space having no adsorption function. As illustrated in Fig. 10, section A is the space having no adsorption function, and the region of the included angle ci (360°-A) is the space having the adsorption function, that is, the io space is formed as the air chamber 33. In addition, the spindle 32 and the cylinder body 31 are supported by and connected to each other through the bearings 341 and 342 provided outside the shoulder 323. The cylinder body 31 is driven by the gear 37 to be rotated on the spindle 32.

In addition, the gripper bar 5 may be provided on both the magnetic orientation is cylinder 20 and the drying paper delivery cylinder 30, so as to ensure smooth handover and accurate delivery of the sheet in the magnetic orientation or drying process.

The working principle of the combined printing apparatus of the present invention is that the sheet passes a paper transport section 118, a paper feeding cylinder 117, a first paper delivery cylinder 116, printing sections and a paper collecting section 101, through one time of printing, the comprehensive printing technology which uses screen printing, ink magnetic base magnetic orientation and letterpress printing can be completed on one side of a single paper, and the process from the paper transport and printing to the collection can be finished. The present invention may be applicable, but not limited to the safe printing of the secure certificates and the marketable securities.

Specifically, a sheet supplied from the paper transport section 118 enters the screen printing unit 4 after passing the paper feeding cylinder 117 and the first paper delivery cylinder 116, and then a screen printing is achieved on the sheet through the combined action of the screen impression cylinder 114 and the screen plate cylinder 115. The screen-printed sheet enters the ink magnetic base magnetic orientation unit from the second paper delivery cylinder 113, wherein the magnetic base in the ink is magnetically oriented when the sheet passes the magnetic orientation cylinder 20. Next1 the sheet enters the first ink photo-curing unit 3 from the third paper delivery cylinder 111. When the sheet passing the drying paper delivery cylinder 30, the photo-curable ink on the sheet is cured by the UV drying device 110 provided on the side of the drying paper delivery cylinder 30. The dried sheet is delivered to the letterpress impression cylinder 106 by the fourth paper delivery cylinder 108, and then to the letterpress printing unit 1.

That is, when the sheet passes the letterpress impression cylinder 106, the letterpress cylinder 103 and the letterpress impression cylinder 106 together apply a pressing force on the sheet to complete the letterpress printing on the sheet. The letterpress-printed sheet is delivered to the second ink photo-curing unit 3 by the fifth paper delivery cylinder 109. When the sheet passes the drying paper delivery cylinder 30, the photo-curable ink on the sheet is cured again by the UV drying device 110 provided on the side of the drying paper delivery cylinder 30. Finally, the sheet enters the paper collecting section o 101 via the paper-out cylinder 107.

In one printing equipment, the present invention inputs the sheets in one time, and the comprehensive printing operation can be completed through the continuous screen printing, magnetic orientation and letterpress printing, then the finished products are delivered to the paper collecting section. Thus, as compared with the prior art, the present invention can greatly shorten the production cycle, decrease the equipment investment, save the areas occupied by the production and storehouse, and reduce the human labor.

In addition, both the magnetic orientation cylinder and the drying paper delivery cylinder in the present invention use the rotary air valve, thereby smoothly adsorbing the presswork on the surface of the magnetic orientation cylinder or the drying paper delivery cylinder in the magnetic orientation or drying process of the magnetic base in the ink on the surface of the presswork. Moreover, when the magnetic orientation cylinder or the drying paper delivery cylinder is rotated such that the presswork needs to be delivered to the third paper delivery cylinder 111 or the fourth paper delivery cylinder 108 for a handover, the presswork in the handover region is no longer adsorbed by the magnetic orientation cylinder or the drying paper delivery cylinder. That is, in the handover region, the surface of the cylinder body having the presswork is located in the section A illustrated in Fig. 3, and the presswork handover error existing in the known art is eliminated since the cylinder body loses the adsorption function in the section.

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 modifications 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 parts of the present invention are not limited to the above general application, and they can be combined with other prior arts upon the actual demand. Therefore, the present invention certainly covers other combinations and specific applications related to the inventive points of the present application.

Claims

CLAIMS1 A combined printing apparatus, comprising: at least one group of ink photo-curing units; and a screen printing unit, an ink magnetic base magnetic orientation unit and a letterpress printing unit which are provided in order; the units being connected to each other through a paper delivery system.
2. The combined printing apparatus according to claim 1, wherein the screen printing unit comprises a screen impression cylinder and at least one group of screen plate cylinders contacted with the screen impression cylinder; the letterpress printing unit comprises a letterpress impression cylinder and at least one group of letterpress cylinders contacted with the letterpress impression cylinder; and the ink photo-curing unit comprises a UV drying and/or infrared drying device, and a drying paper delivery cylinder capable of cooling and absorbing sheets.
3. The combined printing apparatus according to claim 1, wherein a second paper delivery cylinder is provided between the screen printing unit and the ink magnetic base magnetic orientation unit, a third paper delivery cylinder is provided between the ink magnetic base magnetic orientation unit and the ink photo-curing unit, and a paper delivery cylinder or a chain paper delivery mechanism is provided between the ink photo-curing unit and the letterpress printing unit.
4. The combined printing apparatus according to claim 3, wherein the second paper delivery cylinder and the third paper delivery cylinder are cushion cylinders.
5. The combined printing apparatus according to claim 1, wherein the ink photo-curing unit comprises a UV drying and/or infrared drying device and a drying paper delivery cylinder capable of cooling and absorbing sheets; the drying paper delivery cylinder is a rotary air valve, comprising a cylinder body and a spindle, wherein the cylinder body is rotatably nested on the spindle and an air chamber is formed between the cylinder body and the spindle; the spindle is connected to an air extracting device, and capable of extracting the air in the air chamber; and the roll wall of the cylinder body is provided with a cooling passage connected to a cooling water pipe, and adsorption air holes capable of communicating with the air chamber.
6. The combined printing apparatus according to claim 5, wherein the cooling passage is axially provided within the cylinder wall of the cylinder body.
7. The combined printing apparatus according to claim 6, wherein a plurality of the cooling passages are uniformly distributed in the circumferential direction of the cylinder wall of the cylinder body, and the plurality of the cooling passages are connected in series.
8. The combined printing apparatus according to claim 5 or 6, wherein a plurality of the adsorption air holes are radially provided on the cylinder body.
9. The combined printing apparatus according to claim 8, wherein the cooling passage is axially provided in the cylinder wall of the cylinder body and uniformly distributed in the circumferential direction of the cylinder wall of the cylinder body in plurality; and the adsorption air holes are provided between the two adjacent cooling passages and uniformly distributed in the lengthwise direction of the cylinder body.
10. The combined printing apparatus according to claim 1, wherein the ink magnetic base magnetic orientation unit is a magnetic orientation cylinder comprising: a rotary air valve having a spindle and a cylinder body rotatably nested outside the spindle, and an air chamber is formed between the cylinder body and the spindle; the spindle is connected to an air extracting device and capable of extracting the air in the air chamber; the cylinder wall of the cylinder body is provided with through holes capable of communicating with the air chamber; a plurality of annular supports axially provided outside the cylinder body, the outer circumference of each of the annular supports being embedded with a plurality of magnetic field generating devices and first adsorption holes communicated with the through holes; and a cover plate on which a plurality of second adsorption holes are uniformly distributed, the cover plate encapsulating outside the plurality of annular supports.
11. The combined printing apparatus according to claim 10, wherein a plurality of the through holes are axially provided on the cylinder body.
12. The combined printing apparatus according to claim 10, wherein the outer circumference of the cylinder body is axially provided with two keyways, in which a plurality of connecting keys of a number identical to and a width corresponding to those of the annular supports are provided, and the annular supports are connected to the connecting keys through connecting bolts, so as to fix axial and circumferential positions of the annular supports on the outer circumference of the cylinder body, and adjust the axial position thereof.
13. The combined printing apparatus according to claim 12, wherein the keyway is a T-shaped slot, and two rectangular grooves are provided on the inner circumferential wall of the annular support at a position corresponding to the T-shaped slot; the connecting key is a T-shaped key fitted with the T-shaped slot, and one end of the T-shaped key is embedded into the rectangular groove of the annular support, thereby circumferentially limiting the annular support; and the annular support is axially positioned or axially position-adjusted through a connecting bolt.
14. The combined printing apparatus according to claim 12 or 13, wherein the annular support comprises a support ring and a pressing plate provided on the side of the support ring, wherein an annular groove is provided on the side of the support ring, the magnetic field generating device is provided in the annular groove, and each of the magnetic field generating devices is fixed to the support ring through the pressing plate and plurality of set screws.
15. The combined printing apparatus according to claim 14, wherein the support ring is provided with the annular groove on both sides thereof, a shaft shoulder is formed between the two annular grooves, a plurality of the magnetic field generating devices are uniformly distributed in the annular grooves, and both the annular grooves and the shaft shoulder are provided with the first adsorption hole. H
16. The combined printing apparatus according to claim 10, wherein the magnetic field generating device comprises a magnetic block carrier, a magnetic element accommodated in the magnetic block carrier, and a base plate closing the magnetic element in the magnetic block carrier.
17. The combined printing apparatus according to claim 10, wherein one end of the cover plate is fixedly connected to the annular support, and the other end is adjustably fixed in a gripping section, the gripping section being connected to the annular support and moveable in the circumferential direction thereof, so as to tension the cover plate.
18. The combined printing apparatus according to claim 17, wherein the gripping section comprises a pair of upper and lower pressing plates, the other end of the cover plate is fixed between the upper and lower pressing plates, the annular support is connected to the gripping section through a fastening bolt, and the cover plate is strained by adjusting the fastening bolt.
19. The combined printing apparatus according to any of claims 16 to 18, wherein the magnetic block carrier, the base plate and the cover plate are all made of weakly magnetic materials or non-magnetic materials.
20. The combined printing apparatus according to claim 5 or 10, wherein both the drying paper delivery cylinder and the magnetic orientation cylinder are provided with a gripper bar thereon for sheet handover and delivery.
21. The combined printing apparatus according to any of claims 5 to 13, wherein the spindle is axially provided with a hollow air passage; a plurality of air holes communicated with the air passage are provided on the sidewall of the spindle; both ends of the spindle are provided with an annular shoulder respectively; the annular shoulder, the inner wall of the cylinder body and the spindle constitute the air chamber; and the air in the air chamber can be extracted through the air holes.
22. The combined printing apparatus according to claim 21, wherein two radially protruding air chamber partition boards are fixed outside the spindle in the lengthwise direction; the two air chamber partition boards divide a circumferential hollow portion between the spindle and the cylinder body into two spaces, one of which is an air chamber, and the air holes are provided on the spindle in the space of the air chamber.
23. The combined printing apparatus according to claim 22, wherein two groups of corresponding grooves are radially provided on opposite inner sides of the two shoulders, respectively; the two air chamber partition boards are embedded in the grooves, respectively, and fixedly connected to the spindle; and the cylinder body, the two shoulders of the spindle and the two air chamber partition boards form the air chamber.
24. The combined printing apparatus according to claim 23, wherein the adsorption air holes or the through holes are provided in a section corresponding to the air chamber on the cylinder body; in the process of a relative rotation between the cylinder body and the spindle, the surface of the drying paper delivery cylinder or the magnetic orientation cylinder can switch the adsorption and non-adsorption functions.
25. The combined printing apparatus according to claim 22, wherein the shoulder, each of the air chamber partition boards and the cylinder body form a clearance fitting therebetween.is
26. The combined printing apparatus according to claim 25, wherein a clearance of 0.1mm to 4mm respectively exists between the outer circumferential surface of the shoulder and the inner wall surface of the cylinder body and between the outer end surface of each of the air chamber partition boards and the inner wall surface of the cylinder body.
27. The combined printing apparatus according to claim 5 or 10, wherein both ends of the spindle are provided with bearings through which the cylinder body and the spindle are rotatably connected therebetween.
28. The combined printing apparatus according to claim 1, wherein the ink photo-curing unit is provided in front of or behind the letterpress printing unit.
29. The combined printing apparatus according to claim 28, wherein a paper delivery cylinder or a chain paper delivery mechanism is provided between the ink photo-curing unit and the letterpress printing unit.
30, The combined printing apparatus according to claim 1, wherein ink photo-curing units are provided in front of and behind the letterpress printing unit, respectively. L
31. The combined printing apparatus according to claim 30, wherein the ink photo-curing unit and the letterpress printing unit are connected to each other through a fourth paper delivery cylinder and a fifth paper delivery cylinder, or through a chain paper delivery mechanism.