CN116080254A

CN116080254A - Printing machine

Info

Publication number: CN116080254A
Application number: CN202211646268.3A
Authority: CN
Inventors: 於金华; 车文春; 王鑫; 郑祥琪; 孟祥富; 丁学伟; 任锋杰; 陈堃
Original assignee: Zhejiang Weigang Technology Co ltd
Current assignee: Zhejiang Weigang Technology Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-09

Abstract

The invention relates to a printing machine, the cylinder surface of a transfer printing cylinder in a printing mechanism of an offset printing machine set is a complete circle of circumference surface, the processing and manufacturing cost and the difficulty are reduced, a blanket is conveniently wound, coated and stuck on the cylinder surface of the transfer printing cylinder, and the blanket in an adhesive mode is convenient to disassemble and assemble; the head end and the tail end of the blanket are closed and connected, or a rollback notch is reserved between the head end and the tail end of the blanket, the relative positions of the head end and the tail end of the blanket, which are stuck on the transfer printing roller, are different, and the continuous printing and the reciprocating printing can be switched; during reciprocating printing, the rubber blanket with the matched length can be directly glued on the transfer printing cylinder according to the length of the unit pattern on the plate cylinder, and the transfer printing cylinder does not need to be replaced within a certain specification range, so that the printing machine is more convenient and practical. Avoiding the trouble caused by frequent disassembly and assembly of unit patterns with different printing modes or different length specifications and changing the transfer printing roller, and overcoming the defect of the transfer printing roller with the groove.

Description

Printing machine

Technical Field

The present invention relates to printing apparatuses, and in particular to offset printing apparatuses.

Background

In offset printing, continuous printing and intermittent printing are classified, and each of the two printing modes has an independent apparatus.

The continuous printing is high in efficiency and suitable for printing products with large printing quantity, but in order to adapt to different printing unit pattern lengths, a plate cylinder and a transfer cylinder corresponding to the printing unit pattern lengths need to be arranged, extra cost and time are needed for arranging the plate cylinder and the transfer cylinder, and the cost is high and the time cost is long; if the specification of the pattern length of the printing unit is excessive, the printing cost is increased. In addition, continuous printing requires additional expense and time to arrange the plate cylinder and the transfer cylinder for products with small print volumes, resulting in lower printing efficiency.

In addition, intermittent printing (i.e., reciprocating printing, which is generally shorter than full-page printing), requires rollback to eliminate the blank space between the unit patterns on the substrate (e.g., paper or film) during printing, and the print cylinder also requires coordinated rollback (reversing), resulting in low efficiency and high cost. Particularly, the transfer printing roller is required to be provided with a groove on the cylindrical surface for backing the printing stock, and a device for fixing the end part of the rubber blanket is arranged in the groove, so that the processing and manufacturing difficulty, the cost and the time of the transfer printing roller are greatly increased; even still must change different recess sizes according to different specification demands, under the diameter of transfer printing cylinder satisfies the circumstances of specification, has to change transfer printing cylinder because of the recess reason, needs extra dismouting to change the assembly again, and is comparatively troublesome, wastes time and energy, increases use cost.

Disclosure of Invention

In view of the technical problems existing in the background art, the technical problems solved by the invention are to provide a printing machine which has relatively low cost and relatively low processing and manufacturing difficulty of a transfer printing roller, and a printing unit can be used for continuously printing and reciprocally printing.

In order to solve the technical problems, the invention adopts the following technical scheme: a printing press comprising at least one offset printing unit, characterized in that: the offset printing unit comprises a printing mechanism, wherein the printing mechanism comprises a frame, a plate cylinder, a transfer printing cylinder and a printing cylinder are arranged on the frame, the transfer printing cylinder is arranged between the plate cylinder and the printing cylinder, and a rubber blanket is arranged outside the cylindrical surface of the transfer printing cylinder, and the offset printing unit is characterized in that: the cylinder surface of the transfer printing cylinder is a complete circle of circumference surface, the blanket is wound and coated on the cylinder surface of the transfer printing cylinder, and the thickness of the blanket and the radius of the transfer printing cylinder are added to be matched with the radius of the plate cylinder; the head end and the tail end of the rubber blanket are closed and connected, or a rollback notch is reserved between the head end and the tail end of the rubber blanket; the printing mechanisms in each offset printing unit are switched to continuous printing or to reciprocating printing.

The following various optimization or supplementary explanation can be performed on the above technical solutions, respectively.

For example, the offset printing unit is provided with two or more groups in series.

For example, the rack comprises a first bracket and a second bracket, the first bracket is positioned at the front side of the second bracket, and at least one of the first bracket and the second bracket is arranged in a front-back displacement adjustment way; the plate cylinder and the transfer cylinder are connected to a first bracket, and the printing cylinder is connected to a second bracket.

In addition, still be equipped with the support swing arm on the first support, the transfer cylinder sets up on the support swing arm, and the plate cylinder sets up on the first support.

For example, the first bracket is configured on a guide rail running back and forth, the second bracket is fixedly arranged, the frame also comprises a fixed seat, the guide rail is connected to the fixed seat, the second bracket is fixedly connected to the fixed seat, and a first cylinder driving device is connected between the first bracket and the fixed seat of the second bracket or the frame; a second cylinder driving device is connected between the support swing arm and the fixed seat of the frame or the first bracket or the second bracket.

For example, the first cylinder driving means includes a first double-stroke cylinder or a first double-cylinder group; the second cylinder driving device comprises a second double-stroke cylinder or a second double-cylinder group; the first cylinder driving means has a large stroke and a small stroke, and the second cylinder driving means has a large stroke and a small stroke.

For example, a first cylinder driving device is connected between a first bracket and a second bracket, and a first hinge shaft is respectively arranged on the first bracket and the second bracket and is connected with the first cylinder driving device; the second cylinder driving device is connected between the supporting swing arm and the second bracket, and a second hinge shaft is arranged on the supporting swing arm and the second bracket respectively and is connected with the second cylinder driving device; the second bracket is also provided with a swing arm limiting and adjusting ejector rod; the swing arm limiting and adjusting ejector rod is in transmission connection with a telescopic driving device; the left side and the right side of the first bracket are respectively provided with the supporting swing arms, the left side and/or the right side of the second bracket is/are also provided with a rotating plate for the second hinge shaft to be arranged, and the rotating plate is also provided with a rotating driving device; the rotary driving device comprises a rotary driving cylinder, and a rotary limiting part in limiting fit with the rotary plate is arranged on the second bracket.

In addition, still be equipped with the floating seat on the second support, be equipped with first roller and second roller on the floating seat, transfer printing cylinder and the input between the cylinder of bearing link up first roller, transfer printing cylinder and the output between the cylinder of bearing link up the second roller.

The second support is further provided with a first guide roller and a second guide roller, the input end between the transfer printing roller and the printing roller is connected with the first roller through the first guide roller, and the output end between the transfer printing roller and the printing roller is connected with the second roller through the second guide roller.

Wherein the plate cylinder is equipped with a first motor, the transfer cylinder is equipped with a second motor, and the printing cylinder is equipped with a third motor.

Wherein, when the head end and the tail end of the blanket are closed and connected, the printing state is switched to the continuous printing state.

Wherein, when a rollback notch is left between the head end and the tail end of the blanket, the printing blanket is switched to a reciprocating printing state.

The invention has the beneficial effects that in the printing mechanism of the printing unit of the printing machine, the cylindrical surface of the transfer printing roller adopts a complete circle of circumferential surface to process and manufacture cost and difficulty are reduced, and the complete circle of circumferential surface is convenient for the blanket to be connected by wrapping and gluing around the blanket, and the gluing mode blanket is convenient to assemble and disassemble; the relative positions of the head end and the tail end of the blanket which is stuck on the transfer printing roller are different, so that the continuous printing and the reciprocating printing can be switched; during reciprocating printing, the rubber blanket with the matched length can be directly glued on the transfer printing cylinder according to the length of the unit pattern on the plate cylinder, and the transfer printing cylinder does not need to be replaced within a certain specification range, so that the printing machine is more convenient and practical. Avoiding the trouble caused by frequent disassembly and assembly of unit patterns with different printing modes or different length specifications and changing the transfer printing roller, and overcoming the defect of the transfer printing roller with the groove. Thus, the present invention has outstanding substantial features and significant advances over the prior art.

Drawings

The details and working principles of the embodiments and examples of the present invention are described below with reference to the drawings.

FIG. 1 is a side view of a first embodiment of the printing mechanism of the present invention wherein the leading and trailing ends of the blanket are in close contact, in a continuous printing state, with the substrate advancing continuously.

Fig. 2 is an enlarged view of a in fig. 2.

FIG. 3 is a side view of a second embodiment of a printing mechanism according to the present invention; wherein a rollback notch is reserved between the head end and the tail end of the rubber blanket and is in a reciprocating printing state, and the printing stock is intermittently rolled back in the running process; in the figure, the printing roller is reversed, the printing material on the printing roller is in a retreating state, and the retreating notch faces the printing roller and can be used for retreating the printing material.

Fig. 4 is an enlarged view of B in fig. 3.

FIG. 5 is a schematic view of the print substrate cylinder of FIG. 4 switched to forward rotation; the transfer printing roller continues to run, the printing roller rotates forward, and the printing material advances.

Fig. 6 is an enlarged view of C in fig. 5.

FIG. 7 is a right side schematic view of the offset printing unit of the present invention.

Fig. 8 is a schematic view of the other side (left side) of the offset printing unit of fig. 7.

Fig. 9 is a schematic diagram of a tandem structure of a printing unit according to the first embodiment.

Fig. 10 is a schematic diagram of a tandem structure of a printing unit in the second embodiment.

In the figure: 1. a print cylinder; 2. a transfer roller; 3. a plate cylinder; 4. a frame; 51. a first guide roller; 52. a second guide roller; 6. a dampening system; 7. an ink supply system; 9. a blanket; 10. a first bracket; 11. a floating seat; 12. a second bracket; 13. supporting a swing arm; 14. a first roller; 15. a second roller; 16. a joint; 17. backspacing the notch; 30. a substrate; 91. a blanket head end; 92. the tail end of the rubber blanket; 33. a fixing seat; 34. a first cylinder driving device; 35. a second cylinder driving device; 36. a first hinge shaft; 37. a second hinge shaft; 38. the swing arm limits and adjusts the ejector rod; 39. a rotating plate; 40. a rotation driving device; 41. a guide rail; 42. a rotation limiting part; 51. a first guide roller; 52. and a second guide roller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some, but not all, embodiments of the present invention, and that all other embodiments obtained by persons of ordinary skill in the art without making inventive efforts are within the scope of this invention.

Referring to the drawings, a printing press according to an embodiment of the present invention includes at least one offset printing unit, wherein each offset printing unit includes a printing mechanism, and each offset printing unit switches the printing mechanism to continuous printing or to reciprocating printing, so that the printing press performs continuous printing or reciprocating printing. Usually, offset printing units are connected in series with two or more groups, and other units can be connected in series additionally. For example, traction mechanisms (which comprise traction rollers driven by a power motor and the like) are respectively arranged at the front and the rear of the offset printing machine units connected in series.

Referring to the drawings, the printing mechanism of the offset printing unit of the printing press in the embodiment comprises a frame 4, wherein a plate cylinder 3, a transfer printing cylinder 2 and a printing cylinder 1 are arranged on the frame 4; the transfer cylinder 2 is arranged between the plate cylinder 3 and the printing cylinder 1, and a blanket 9 is arranged outside the cylindrical surface of the transfer cylinder 2; wherein the plate cylinder 3, the transfer cylinder 2 and the printing cylinder 1 cooperate to realize offset printing; in printing engagement, the plate cylinder 3 is engaged with the transfer cylinder 2 in a counter-rolling manner, the pattern of the plate on the plate cylinder 3 is transferred to the blanket 9 of the transfer cylinder 2, the transfer cylinder 2 is engaged with the blanket 1 in a counter-rolling manner, and the pattern on the blanket 9 of the transfer cylinder 2 is transferred to a substrate 30 (typically a continuous roll of paper or film or the like) between the transfer cylinder 2 and the blanket 1.

The cylindrical surface of the transfer printing roller 2 is a complete circle of circumferential surface, namely, the cylindrical surface of the transfer printing roller 2 is a complete circle of circumferential surface, and the transfer printing roller is free of grooves, simpler in processing and manufacturing, shorter in manufacturing period and smaller in difficulty, and is not influenced by the size and the specification of the grooves in the subsequent use.

The blanket 9 is to be wrapped and adhered on the cylindrical surface of the transfer printing roller 2, that is, the blanket 9 is to be wrapped and adhered on the cylindrical surface of the transfer printing roller 2, and the blanket and the cylindrical surface of the transfer printing roller are connected and fixed by gluing (such as the blanket is self-adhesive or is adhered by glue, etc.), so that the blanket 9 is convenient to detach and install on the cylindrical surface of the transfer printing roller 2, no additional fixing device (such as a clamp, etc.) is needed for fixing, and no groove is needed for setting the fixing device on the cylindrical surface of the transfer printing roller 2.

Wherein the sum of the thickness of the blanket 9 and the radius of the transfer cylinder 2 matches the radius of the plate cylinder 3, i.e., the value (R1) of the radius of the plate cylinder 3 matches the value (d+r2) of the sum of the thickness of the blanket 9 and the radius of the transfer cylinder 2, typically the value (R1) is the same as or similar to the value (d+r2) (slightly offset), or the cylinder circumferences of the plate cylinder 3 and the blanket are made to be the same as or similar to each other (slightly offset) or to be in an integer multiple relationship (slightly offset) with each other on the transfer cylinder 2 when the blanket is closed end to end (closed end to end), but there is a slight offset due to the influence of processing accuracy, assembly accuracy, etc., and can also be matched within an error range. It is ensured that the unit pattern on the plate cylinder 3 can be smoothly transferred to the same position of the blanket 9 of the transfer cylinder 2 every time, and the pattern is not easily dislocated.

The blanket 9 is wrapped around and adhered to the cylindrical surface of the transfer cylinder 2, and in this embodiment, the blanket 9 is switched between continuous printing and reciprocating printing by changing the relative positions of the leading end 91 and the trailing end 92 on the transfer cylinder 2. Wherein the head end 91 and the tail end 92 of the blanket 9 are in closed connection, the head end 91 and the tail end 92 of the blanket 9 which are stuck and wound in a circle are connected, the head end 91 and the tail end 92 of the blanket 9 are connected, and the joint 16 between the head end 91 and the tail end 92 can be very small so that the head end 91 and the tail end 92 are almost abutted together, and the structure of the blanket 9 stuck on the transfer cylinder 2 is used for continuous printing. Alternatively, a back gap 17 is left between the head end 91 and the tail end 92 of the blanket 9, the head end 91 and the tail end 92 of the blanket 9 with the coils (not the whole coils) are separated by a certain distance, the distance forms the back gap 17, the back gap 17 is used for backing the printing stock 30, when the back gap 17 is opposite to the printing cylinder 1, the printing stock 30 between the transfer cylinder 2 and the printing cylinder 1 is not pressed and can be smoothly backed, and the structure of the blanket 9 attached to the transfer cylinder 2 is used for reciprocating printing cutting; in addition, the blanket 9 having a length selected to be matched according to the length of the unit pattern on the plate cylinder 3 can be directly adhered to the transfer cylinder 2, and the transfer cylinder 2 does not need to be replaced within a certain specification range. The relative positions of the leading end 91 and the trailing end 92 of the blanket 9 are different, and the continuous printing and the reciprocating printing are switched.

The working principle is as follows: in the printing mechanism in the printing machine, the cylinder surface of the transfer printing cylinder 2 adopts a complete circle (whole circle) of circumference surface, and the transfer printing cylinder 2 of the whole circle of circumference surface is externally stuck with a rubber blanket 9; when the blanket 9 is wrapped around and stuck to the cylindrical surface of the transfer cylinder 2, the continuous printing and the reciprocating printing are switched according to the difference in the relative positions of the leading end 91 and the trailing end 92 of the blanket 9. Wherein the leading end 91 and the trailing end 92 of blanket 9 are in close contact for continuous printing. Wherein, a back gap 17 is left between the head end 91 and the tail end 92 of the blanket 9 for reciprocating printing. After the blanket 9 is adhered to the cylindrical surface of the transfer cylinder 2, the relative positions of the leading end 91 and the trailing end 92 of the blanket 9 are different, and the continuous printing and the reciprocating printing are switched. The printing machine can be suitable for high-efficiency printing of large-batch printing sheets and can also be suitable for high-efficiency printing requirements of small-batch printing sheets.

The printing mechanism with the continuous printing and reciprocating printing switching mode is adopted in the printing machine, wherein the cylindrical surface of the transfer printing cylinder 2 adopts a complete circle of circumferential surface to process and manufacture cost and difficulty are reduced, the complete circle of circumferential surface is convenient for the blanket 9 to be connected by wrapping and gluing on the complete circle of circumferential surface, the gluing mode blanket 9 is convenient to assemble and disassemble, and a blanket fixing device is not needed; the relative positions of the head end 91 and the tail end 92 of the blanket 9 which is stuck on the transfer printing roller 2 are different, so that the continuous printing and the reciprocating printing can be switched; during reciprocating printing, the rubber blanket 9 with the matching length selected according to the length of the unit pattern on the plate cylinder 3 can be directly glued on the transfer printing cylinder 2, and the transfer printing cylinder 2 is not required to be replaced within a certain specification range, so that the printing machine is more convenient and practical. Avoiding the trouble caused by frequent disassembly and assembly of unit patterns with different printing modes or different length specifications and changing the transfer printing roller 2, and overcoming the defect of the transfer printing roller 2 with grooves for the installation of the rubber blanket 9 and for the printing rollback.

The following optimizations or further description can be made on the basis of the above embodiments, respectively.

Wherein the head end 91 and the tail end 92 of the blanket 9 are switched to a continuous printing state when they are in close contact.

Wherein the printing state is switched to the reciprocating printing state when the head end 91 and the tail end 92 of the blanket 9 are separated by the back gap 17, and the blanket 9 does not completely wrap around the transfer cylinder 2 for one full turn.

For example, the plate cylinder 3 is provided with a first motor, the plate cylinder 3 is driven to rotate by the first motor, the transfer cylinder 2 is provided with a second motor, the transfer cylinder 2 is driven to rotate by the second motor, the print substrate cylinder 1 is provided with a third motor, and the print substrate cylinder 1 is driven to rotate by the third motor. Of course, a common motor linkage may be employed. The printing cylinder 1 may also be provided with curing means 23 (e.g. using UV curing means, etc.).

The frame 4 comprises a first support 10 and a second support 12, the first support 10 is positioned at the front side of the second support 12, at least one of the first support 10 and the second support 12 is arranged in a back-and-forth displacement adjustment mode, the first support 10 and the second support 12 can be separated and folded through the back-and-forth displacement position adjustment, the plate cylinder 3 and the transfer cylinder 2 are connected to the first support 10, the printing cylinder 1 is connected to the second support 12, and the printing cylinder 1 can be separated relative to the transfer cylinder 2 through the separation of the first support 10 and the second support 12, so that the separation is not contacted (in a pressure-leaving state) or a space position is vacated, and parts such as sticking a rubber blanket 9, such as dismounting the transfer cylinder 2, can be conveniently assembled and disassembled; when the first and

second brackets

10 and 12 are closed, the printing cylinder 1 is brought close to the transfer cylinder 2 (in a closed state) to perform printing. For example, in the figure, the first bracket 10 is set for forward and backward displacement adjustment, the second bracket 12 is fixedly arranged, the frame 4 further comprises a fixed seat 33 (such as a base), the guide rail 41 is connected to the fixed seat 33, the second bracket 12 is fixedly connected to the fixed seat 33, and the second bracket 10 is configured on the guide rail 41 (the guide rail 41 is arranged in a forward and backward direction so that the first bracket 10 moves forward and backward) so as to smoothly and stably adjust forward and backward displacement; the second support 12 is fixedly arranged, the relative position of the rotation axis of the printing cylinder 1 on the second support 12 is unchanged, and the printing stock 30 cannot be influenced by the front-back displacement of the first support 10 when the printing stock 30 is wound on the printing cylinder 1 on the second support 12, so that the problems of loosening of the printing stock 30 and the like are avoided.

It can be further optimized that a supporting swing arm 13 is further arranged on the first bracket 10, the transfer printing roller 2 is arranged on the supporting swing arm 13, and the plate roller 3 is arranged on the first bracket 10. The support swing arm 13 rotates (swings) the adjustment position at first support 10, down the pendulum makes things convenient for transfer printing cylinder 2 to change different diameter specifications, transfer printing cylinder 2 after the change upwards swings and closes plate cylinder 3 cooperation printing along with support swing arm 13, and structure operation is convenient, can be suitable for different diameter specification and closes the pressure demand.

In addition, the front-back displacement adjustment of the first bracket 10 can be driven by driving power (such as a cylinder or a motor, etc.) to move; for example, a first cylinder driving device 34 is connected between the first bracket 10 and the second bracket 12 or the fixed seat 33 of the frame, and the first cylinder driving device 34 drives the first bracket 10 to shift (move) back and forth. The first cylinder driving means 34 may employ a single cylinder; the first double-stroke cylinder or the first double-cylinder group can be adopted, the first double-stroke cylinder or the first double-cylinder group can enable the first cylinder driving device to have a large stroke and a small stroke, the large stroke can drive the first bracket in place, the small stroke can enable the first bracket to relatively make a small-distance clutch movement, the plate cylinder and the transfer cylinder can be relatively clutched, the printing plate cylinder is relatively more practical, only the small-stroke operation is needed when printing is suspended, and the large-stroke cooperation operation can be realized when the specification of the plate sleeve needs to be adjusted or replaced.

Also, the swing adjusting position of the supporting swing arm 13 can be driven by driving power (such as a cylinder or a motor, etc.) to swing; for example, a second cylinder driving device 35 is connected between the support swing arm 13 and the fixed seat 33 of the frame 4 or the first bracket 10 or the second bracket 12, and the second cylinder driving device 35 drives the support swing arm 13 to swing and rotate. The second cylinder driving means 35 may employ a single cylinder; the second double-stroke cylinder or the second double-cylinder group can be adopted, the second double-stroke cylinder or the second double-cylinder group can enable the second cylinder driving device 35 to have a large stroke and a small stroke, the large stroke can drive the supporting swing arm 13 in place, the small stroke can enable the supporting swing arm 13 to move in a clutch mode with a small angle relative to the swinging motion, the transfer printing cylinder 2 and the printing cylinder 1 can be clutched, the printing machine is relatively more practical, only the small stroke operation is needed when printing is suspended, and the large stroke cooperation operation can be realized when the specification of the printing plate sleeve needs to be adjusted or replaced.

For example, in the drawings, a first cylinder driving device 34 is connected between a first bracket 10 and a second bracket 12, a first hinge shaft 36 is respectively provided on the first bracket 10 and the second bracket 12, and the first hinge shaft 36 is connected with the first cylinder driving device 34; the second cylinder driving device 35 is connected between the supporting swing arm 13 and the second bracket 12, the supporting swing arm 13 and the second bracket 12 are respectively provided with a second hinge shaft 37, and the second hinge shafts 37 are connected with the second cylinder driving device 35 so as to be capable of rotating relatively in the transmission process; the first cylinder driving means 34 has a large stroke and a small stroke, and the second cylinder driving means 35 has a large stroke and a small stroke, and the double stroke structure is more practical. When the first cylinder driving device 34 drives the first carriage 10 to approach the second carriage 12, the plate cylinder 3 on the first carriage 10 can be brought into contact with the transfer cylinder 2; when the second cylinder driving device 35 drives the supporting swing arm 13 to approach the second bracket 12, the transfer printing roller 2 on the supporting swing arm 13 leans against the printing roller 1; the acting forces of the first cylinder driving device 34 and the second cylinder driving device 35 cannot be mutually offset, and the structural layout is more reasonable.

In addition, the second bracket 12 is further provided with a swing arm limiting and adjusting ejector rod 38, and the swing arm limiting and adjusting ejector rod 38 is used for limiting and propping the supporting swing arm 13 of the second bracket 12 which swings close (leans against), and the pressure between the transfer printing cylinder 2 and the printing cylinder 1 can be controlled by limiting and propping the supporting swing arm 13. The swing arm limiting and adjusting ejector rod 38 is also in transmission connection with a telescopic driving device 43, and the telescopic driving device 43 drives the (axial) relative position of the swing arm limiting and adjusting ejector rod 38, so that the relative position of the supporting swing arm 13 leaning towards the second bracket 12 can be adjusted, and the adjustment of the pressure is realized. The telescopic driving device 43 may be a manual drive, a motor drive, or the like, and the telescopic driving device 43 may be configured to include a screw-nut mechanism (including a screw and a nut) or a worm-gear mechanism (including a worm wheel and a worm).

In addition, the support swing arms 13 are respectively disposed on the left side and the right side of the first bracket 10, the left side and/or the right side of the second bracket 12 are/is further provided with a rotating plate 39 for setting the second hinge shaft 37, in the figure, the right side of the second bracket 12 is provided with the rotating plate 39 for setting the second hinge shaft 37, the support swing arms 13 can be connected with the second bracket 12 through the second hinge shaft 37 on the rotating plate 39, the rotating plate 39 can rotate one of the rotating plates 39 when the transfer printing roller 2 on the support swing arms 13 needs to be replaced through the rotation switching position, and the support swing arms 13 on the left side or the right side of the first bracket 10 are driven to swing, so that the support swing arms 13 on the left side and the right side of the first bracket 10 can be driven to be mutually staggered, and the transfer printing roller 2 can be conveniently moved axially to be replaced and assembled. The rotary plate 39 is further provided with a rotary driving device 40, and the rotary driving device 40 drives the rotary plate 39 to rotate and switch positions, and the rotary driving device 40 can adopt an air cylinder, a motor, manual operation or the like as power. In the figure, the rotation driving device 40 comprises a rotation driving cylinder, a rotation limiting part 42 is arranged on the second bracket 12, and the rotation limiting part 42 is in limiting fit with the rotating plate 39, so that the rotating plate 39 is limited when rotating in place, and the supporting swing arm 13 can be driven to return (rotate) accurately in place through the limiting; the rotation limiting portion 42 may be a limiting block, a limiting rod, or the like, and the rotation driving cylinder may be mounted on the second bracket 12 and is in transmission connection with the rotation plate 39.

In addition, the second bracket 12 is preferably further provided with a floating seat 11, the floating seat 11 usually moves back and forth along a linear direction to adjust the floating position, and of course, the floating seat 11 can also move back and forth along an arc track to adjust the floating position (such as in the form of a floating swing arm), and the floating seat 11 can be moved and adjusted by power (such as power of a motor or a cylinder) or manual driving. Wherein the floating seat 11 is provided with a first roller 14 and a second roller 15, and the input end between the transfer printing roller 2 and the printing roller 1 is connected with the first roller 14, namely the printing stock 30 is wound on the first roller 14 and then enters the input end (between the transfer printing roller 2 and the printing roller 1); the output between the transfer cylinder 2 and the printing cylinder 1 engages the second roller 15, i.e. the printing material 30 is wound onto the second roller 15 after exiting the output (between the transfer cylinder 2 and the printing cylinder 1). Wherein the printing material 30 enters between the transfer roller 2 and the printing roller 1 from the input end, and the printing material 30 is output from the output end after being printed between the transfer roller 2 and the printing roller 1. The floating seat 11 and the first roller 14 and the second roller 15 on the floating seat are matched together to perform floating movement adjustment, so that the relative position of a printing object 30 (including the front and the back of the printing pattern) on the printing cylinder 1 can be adjusted, the problem of misalignment and registration of multicolor printing unit patterns in the printing process can be solved, and the registering process is relatively more accurate.

In addition, a first guide roller 51 and a second guide roller 52 are further arranged on the second support 12, the input end between the transfer printing cylinder 2 and the printing cylinder 1 is connected with the first roller 14 through the first guide roller 51, the output end between the transfer printing cylinder 2 and the printing cylinder 1 is connected with the second roller 15 through the second guide roller 52, and the printing material 30 is guided by the first guide roller 51 and the second guide roller 52 in a matching manner in the winding process so that the smooth arrangement winding trend of the printing material 30 is realized, and the number of the first guide roller 51 and the second guide roller 52 can be set according to requirements. A dampening system 6, an inking system 7, and a plate cylinder 3 may be provided on the frame 4 (e.g., the first support 10).

Claims

1. A printing press comprising at least one offset printing unit, characterized in that: offset press unit is including print mechanism, and print mechanism is equipped with plate cylinder (3), transfer cylinder (2) and printing cylinder (1) including frame (4) on frame (4), and transfer cylinder (2) disposes between plate cylinder (3) and printing cylinder (1), and the drum face of transfer cylinder (2) is rubber blanket (9) outward, its characterized in that:

the cylinder surface of the transfer printing cylinder (2) is a complete circle of circumference surface, the blanket (9) is wrapped and stuck on the cylinder surface of the transfer printing cylinder (2),

the sum of the thickness of the blanket (9) and the radius of the transfer cylinder (2) is matched with the radius of the plate cylinder (3);

the head end (91) and the tail end (92) of the rubber cloth (9) are in closed connection, or a back gap (17) is reserved between the head end (91) and the tail end (92) of the rubber cloth (9);

the printing mechanisms in each offset printing unit are switched to continuous printing or to reciprocating printing.

2. A printing press as claimed in claim 1, wherein: the offset printing machine sets are connected in series with two or more groups.

3. A printing press as claimed in claim 1, wherein: the frame (4) comprises a first bracket (10) and a second bracket (12), the first bracket (10) is positioned at the front side of the second bracket (12), and at least one of the first bracket (10) and the second bracket (12) is arranged in a front-back displacement adjustment way;

the plate cylinder (3) and the transfer cylinder (2) are connected to a first support (10), and the printing cylinder (1) is connected to a second support (12).

4. A printer according to claim 3, wherein: the first bracket (10) is also provided with a supporting swing arm (13), the transfer printing cylinder (2) is arranged on the supporting swing arm (13), and the plate cylinder (3) is arranged on the first bracket (10).

5. A printer according to claim 4, wherein: the first bracket (10) is arranged on a guide rail (41) which runs back and forth, the second bracket (12) is fixedly arranged,

the frame (4) also comprises a fixed seat (33), the guide rail (41) is connected to the fixed seat (33), the second bracket (12) is fixedly connected to the fixed seat (33),

a first cylinder driving device (34) is connected between the first bracket (10) and the second bracket (12) or a fixed seat (33) of the frame (4);

a second cylinder driving device (35) is connected between the fixed seat (33) supporting the swing arm (13) and the frame (4) or the first bracket (10) or the second bracket (12).

6. A printer according to claim 5, wherein:

the first cylinder driving device (34) comprises a first double-stroke cylinder or a first double-cylinder group;

the second cylinder driving device (35) comprises a second double-stroke cylinder or a second double-cylinder group;

the first cylinder driving means (34) has a large stroke and a small stroke, and the second cylinder driving means (35) has a large stroke and a small stroke.

7. A printer according to claim 5, wherein:

the first cylinder driving device (34) is connected between the first bracket (10) and the second bracket (12), and a first hinge shaft (36) is respectively arranged on the first bracket (10) and the second bracket (12) and is connected with the first cylinder driving device (34);

the second cylinder driving device (35) is connected between the supporting swing arm (13) and the second bracket (12), and a second hinge shaft (37) is respectively arranged on the supporting swing arm (13) and the second bracket (12) and connected with the second cylinder driving device (35);

a swing arm limiting and adjusting ejector rod (38) is further arranged on the second bracket (12); the swing arm limiting and adjusting ejector rod (38) is in transmission connection with a telescopic driving device;

the left side and the right side of the first bracket (10) are respectively provided with the supporting swing arm (13), the left side and/or the right side of the second bracket (12) is/are also provided with a rotating plate (39) for arranging a second hinge shaft (37), and the rotating plate (39) is also provided with a rotating driving device (40);

the rotary driving device (40) comprises a rotary driving cylinder, and a rotary limiting part (42) in limit fit with the rotary plate (39) is arranged on the second bracket (12).

8. A printer according to claim 3, wherein: a floating seat (11) is further arranged on the second bracket (12), a first roller (14) and a second roller (15) are arranged on the floating seat (11), an input end between the transfer printing roller (2) and the printing roller (1) is connected with the first roller (14), and an output end between the transfer printing roller (2) and the printing roller (1) is connected with the second roller (15);

the second bracket (12) is also provided with a first guide roller (51) and a second guide roller (52), the input end between the transfer printing roller (2) and the printing roller (1) is connected with the first roller (14) through the first guide roller (51), and the output end between the transfer printing roller (2) and the printing roller (1) is connected with the second roller (15) through the second guide roller (52);

the plate cylinder (3) is equipped with a first motor, the transfer cylinder (2) is equipped with a second motor, and the printing cylinder (1) is equipped with a third motor.

9. A printing press as claimed in claim 1, wherein: the head end (91) and the tail end (92) of the blanket (9) are switched to a continuous printing state when being in closed connection.

10. A printing press as claimed in claim 1, wherein: the printing device is switched to a reciprocating printing state when a back gap (17) is reserved between a head end (91) and a tail end (92) of the blanket (9).