JP2005022398A - Perfecting sheet-fed printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a perfecting sheet-fed printing machine which has no fear of causing soiling of the sheet on its print face (coated face), can realize a significant improvement in print quality, can reduce waste sheet, and can stably transfer the sheet to improve drying efficiency. <P>SOLUTION: This perfecting sheet-fed printing machine includes a first intermediate cylinder, which comprises an intermediate cylinder, of which the circumferential face comes into contact with the printed face side after printing on the upstream side, provided with an air blowout means for blowing out gas such as air toward the outer circumferential face of the cylinder. The perfecting sheet-fed printing machine further includes a second intermediate cylinder, which comprises an intermediate cylinder, on the downstream side of the first intermediate cylinder, provided with a gas suction means for sucking gas such as air toward the inner circumferential face of the cylinder. The air blowout region of the gas blowout means is limited to only the width and the circumferential section with which the sheet possibly comes into contact. The gas blowout timing in the gas blowout means was set to the sheet holding range in the cylinder rotating direction with which the sheet possibly comes into contact. Further, drying means, cooling means and the like are also improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the double-sided printing machine in which the coating unit is arranged in the most downstream of the front and back printing units, the present invention is provided between the printing unit located upstream and the printing unit located downstream, and the printing unit located upstream. The present invention relates to a double-sided sheet-fed printing machine in which a structure of an intermediate cylinder for stably transferring a sheet from a coating unit to a printing unit located downstream, a drying unit, a cooling unit, etc. are devised.

  FIG. 7 is an explanatory view showing the schematic configuration of the entire conventional general duplex sheet-fed printing press, and FIG. 8 is a diagram between the back-side printing device (unit) and the front-side printing device (unit) of the duplex sheet-fed printing press. It is a structure explanatory drawing of the intermediate trunk | drum part arrange | positioned in. 9 is an explanatory diagram of the configuration of the ink supply device portion F in FIG. 8 installed in the front surface printing unit, and FIG. 10 is a coating liquid (varnish) supply device portion in G portion in FIG. 8 installed in the back surface coating unit. FIG.

  As shown in FIGS. 7 and 8, the conventional general double-sided sheet-fed printing machine includes a sheet feeding device 19, a feeder board unit 20, a back surface printing unit 1, a back surface coating unit 36, and a front surface printing unit 2 as main components. A plurality of intermediate cylinders 3 (3a to 3d) for transferring the sheet 4 from the pressure drum 5b of the back surface coating unit 36 to the pressure drum 5c of the front surface printing unit 2, a UV drying device 6, and a discharge It is composed of a paper device 21 and the like.

  The paper discharge device 21 includes a sheet conveying device 22 and a sheet stacking device 23 provided below the downstream end of the sheet conveying device 22.

  The double-sided sheet-fed printing press shown in FIG. 7 is configured to print one color on both the front and back sides and coat the printed surface.

  The impression cylinder 5b positioned at the outlet of the back coating unit 36 and the impression cylinder 5c of the front surface printing unit 2 are respectively provided with gears fixed to the shaft ends, which are shafts of the intermediate cylinders 3a to 3d. They are connected to each other via a gear fixed to the end, and rotate in a predetermined direction synchronously.

  In addition, the sheet supply device 19 stacks the sheets 4 to be printed on the sheet feeding table 30, and one sheet at a time from the uppermost sheet 4 according to the consumption speed (machine speed) associated with printing. It is a device that supplies sequentially.

  The next feeder board unit 20 is installed between the sheet supply device 19 and the back surface printing unit 1 as the first printing device. The sheet 4 sequentially fed from the sheet supply device 19 is introduced into the back surface printing unit 1. It functions to transfer to the intermediate cylinder 24 arranged in the section.

  The sheet 4 is transferred from the intermediate cylinder 24 to the next intermediate cylinder 25 and transferred to the impression cylinder 5a of the back surface printing unit 1 for printing. The sheet 4 printed on the back surface is further transferred through the intermediate cylinder 3 and then coated on the printed surface by the back surface coating unit 36.

  Subsequently, after the sheet 4 is conveyed sequentially through the first intermediate cylinder 3a, the second intermediate cylinder 3b, the third intermediate cylinder 3c, and the fourth intermediate cylinder 3d, the pressure of the surface printing unit 2 positioned downstream is obtained. After being transferred to the cylinder 5 c and subjected to surface printing in the same manner as the above-described back surface, and further transferred through the intermediate cylinder 3, the surface is coated by the surface coating unit 37.

  As shown in FIG. 9, the ink supply device of the single back surface printing unit 1 or front surface printing unit 2 includes an ink reservoir 31, an ink roller group 32, and a plate cylinder 34 on which a printing plate 33 is wound, a blanket cylinder 35, an impression cylinder. 5c (5a), a wet water device 38 and the like.

  The ink 18 supplied to the ink reservoir 31 is appropriately kneaded in the process of sequentially transferring the ink roller group 32, transferred and supplied as an ink film to the surface of the printing plate 33 mounted on the plate cylinder 34, and then a blanket cylinder 35 as a pattern. It will be transferred to the outer peripheral surface. In parallel with this, dampening water is also transferred from the dampening device 38.

  Thereafter, the image is transferred to the surface of the sheet 4 running between the blanket cylinder 35 and the impression cylinder 5c (5a), and predetermined printing is completed.

  However, in one set of printing units, only one color can be printed. When multi-color printing is performed, a plurality of sets of printing units (1a to 1n) (not shown) having different ink colors along the sheet running direction. ), (2a to 2n) are arranged in parallel, and the intended multicolor printing is performed by sequentially passing the printing unit group.

  Next, as shown in FIG. 10, the back surface coating unit 36 or the surface coating unit 37 includes a varnish reservoir 40 filled with a varnish 39 used as a coating liquid, a varnish base roller 41a, a varnishing roller 41, a plate cylinder 42, and the like. The varnish 39 supplied to the varnish reservoir 40 is appropriately kneaded through the varnishing roller 41 and transferred to the outer peripheral surface of the plate cylinder 42.

  Thereafter, the image is transferred to the surface of the sheet 4 running between the plate cylinder 42 and the impression cylinder 5b (5d), and predetermined coating is completed.

  The sheet 4 that has been printed and coated as described above is transferred from the impression cylinder 5d to the sheet conveying device 22 of the paper discharge device 21, that is, the chain gripper of the endless chain 28 driven by the paper discharge shaft 27. The sheet is conveyed to the sheet stacking device 23 in a gripped state and stacked on the sheet discharge table 29 of the sheet stacking device 23. When a predetermined amount is stacked, the sheet stacking device 23 is appropriately transported to the outside. Become.

  In the conventional double-sided sheet-fed printing machine, when the coating is applied to the surface on the downstream side shown in FIG. 7, the sheet can be conveyed by a chain gripper provided on the paper discharge shaft 27 and the endless chain 28. When the sheet 4 is transferred to the front surface printing unit 2 side after the printing on the back surface of the sheet 4 by the back surface printing unit 1 and the coating operation on the printing surface by the back surface coating unit 36 are completed. In this case, the sheet 4 immediately after coating the printing surface is transferred to the first intermediate cylinder 3a.

  Therefore, in the first intermediate cylinder 3a engaged adjacent to the drum-shaped impression cylinder 5b, there is no time for the coating liquid varnish 39 coated on the printing surface to dry, and coating is performed. The coating surface in an undried state immediately after the contact comes into contact with the outer peripheral surface of the first intermediate cylinder 3a.

Therefore, in the conventional double-sided sheet-fed printing machine, in the first intermediate cylinder 3a,
(1) The coating surface of the sheet 4 is soiled or scratched.
(2) Due to the adhesion of the varnish 39, which is a coating liquid, the outer peripheral surface of the first intermediate cylinder 3a is soiled together with the printed surface of the sheet 4, and this stain is transferred to the succeeding sheet 4. There is a risk that a large amount of waste paper will be generated.
(3) The varnish 39 attached to the surface of the first intermediate cylinder 3a is dried, cured, and scratched on the printing surface of the subsequent sheet 4 that is sequentially conveyed.
There were various problems. In the second intermediate cylinder 3b,
(4) Since the conveyance state becomes unstable due to fluttering or sagging of the sheet 4 to be transferred, an effective drying function by the UV drying device 6 cannot be obtained, and the sheet 4 is deformed or scratched. There is a fear.
And so on.

  In a sheet-fed printing press, blow air is blown from a plurality of orifices provided on the circumferential surface of the printing cylinder so that the sheet is supported on the circumferential surface of the intermediate cylinder without turning over, or the sheet is printed on the printing cylinder. It is well known that the sheet is adsorbed to the circumferential surface of the printing cylinder so as to be held on the circumferential surface of the cylinder, and the area of the recessed portion is formed on the outer periphery of the cylinder base body in which a large number of recessed portions are formed. A peripheral wall body having a plurality of through passages is attached, and the concave portion is connected to a suction air source or a blow air source, and acts on the lower surface of the sheet conveyed on the circumferential surface of the printing cylinder. There has also been proposed one in which a blow and suction section is formed (see, for example, Patent Document 1).

  However, they are designed to blow out air toward the cylinder outer peripheral surface of the printing cylinder or to suck air toward the inner peripheral surface of the printing cylinder, and the printing unit positioned downstream and the printing unit positioned downstream. It is not applied to the intermediate cylinder located in the middle of the unit.

  In addition, as a cylinder for guiding sheets for printing presses, air is blown out from a number of openings provided in the cylinder peripheral wall so that the sheet is conveyed without being set off, or the coated varnish is dried. Has also been proposed (see, for example, Patent Document 2).

  However, the cylinder does not perform a function of preventing the conveyance state from becoming unstable due to fluttering or sagging of the sheet to be transferred, and further improvement has been desired.

  Next, FIG. 11 is an explanatory diagram showing the overall schematic configuration of a conventional double-sided sheet-fed printing press equipped with a drying means, a cooling means, and the like.

  Although the basic configuration is substantially the same as that shown in FIG. 7, in the conventional double-sided sheet-fed printing machine shown in FIG. 11, the sheet supplied from the sheet supply apparatus 101 is located upstream to perform pre-printing. After being printed by the back surface printing unit 102, it passes through the first to fourth intermediate cylinders 104 to 107 positioned at the intermediate connecting portion 103, and then is transferred to the front surface printing unit 108 positioned downstream for performing the post-printing while being guided by the guide 122. After being supplied and applied with a varnish by the downstream surface coating unit 109, the varnish is dried by the drying device 113 and stacked on the paper discharge device 111.

  In the drying device 113, UV irradiation is performed by irradiating with an ultraviolet ray from an irradiation lamp 114 and curing is performed. In normal printing, infrared rays are irradiated and drying is performed. Since the temperature of the sheet rises, a cold air blowing device 112 that blows cold air to the sheet is provided as a cooling means.

  However, there is nothing in the drying device 113 that contacts the printing surface of the sheet conveyed by the chain.

  By the way, although the printing surface of the sheet previously printed by the upstream back surface printing unit 102 is in contact with the surface of the intercolor intermediate cylinder 123 before reaching the connecting portion 103, the surface of the intercolor intermediate cylinder 123 and the printing surface of the sheet Since there is no relative speed difference, the printed surface of the sheet will not rub.

  It should be noted that even if the intercolor intermediate cylinder 123 is wrapped with a coating material that is normally difficult to adhere ink or varnish, and the printed surface of the sheet comes into contact with the surface of the intercolor intermediate cylinder 123, there are problems such as scratches. Care is taken not to occur.

  Further, the printing surface of the sheet printed by the front surface printing unit 108 located downstream of the connecting portion 103 is also in contact with the intercolor intermediate cylinder 118, but in the same way, consideration is given so as not to cause troubles such as scratches.

  However, in the above conventional double-sided sheet-fed printing machine, when the printing surface of the sheet previously printed by the back surface printing unit 102 is printed by the front surface printing unit 108 downstream of the connecting portion 103, the printing surface becomes the impression cylinder 110. Because of the contact, the printing surface is likely to be smudged. In particular, at the connecting portion 103, the printing surface is at the lower side in the second intermediate cylinder 105 and the fourth intermediate cylinder 107, and the sheet hangs down due to gravity and the printing surface becomes a guide 122. When contacted, scratches are generated on the printed surface, and particularly with varnishes that are easily affected by the smoothness of the surface, there is a problem that the gloss of the varnish is lowered and the print quality is deteriorated.

  In order to prevent the deterioration of the print quality, the printing surface of the sheet may be dried at the connecting portion 103. However, the printing surface of the second intermediate cylinder 105 is on the lower side, and the sheet hangs down due to gravity. Is different depending on the operation speed, the quality of the sheet, the amount of ink and varnish applied, etc. Even if the drying device 113 is provided below the second intermediate cylinder 105, the irradiation lamp of the sheet and the drying device 113 is caused by the drooping of the sheet. There is a problem in that a good print quality cannot be obtained even if the drying device 113 is provided because the distance between the 114 varies and the printing surface of the sheet is not uniformly irradiated with the necessary and sufficient irradiation energy.

  Therefore, in the conventional double-sided sheet-fed printing press, the varnish can be applied only on one side by the downstream surface coating unit 109, and when it is desired to apply the varnish to both sides of the sheet in order to increase the added value of the printed matter, After applying the varnish to one side of the sheet and drying it, it is necessary to take out the printed matter from the machine once, restack it, supply the sheet again from the sheet supply device 101, and apply the varnish to the other side as well and dry it. There is.

  However, when the varnish is additionally applied in this way, the second sheet passing to the double-sided sheet-fed printing machine is not only troublesome to handle the sheet, but also tends to cause scratches on the printing surface during sheet passing, Good print quality could not be obtained, and this was a big problem especially when printing high-quality printed matter.

  In addition, for example, varnish coating and drying on the front and back surfaces of each of the front surface printing unit and the back surface printing unit via one varnish coater cylinder are also proposed (see, for example, Patent Document 3). However, the above problems cannot be solved, and further improvement has been desired.

JP 2000-108299 A (paragraphs 0002, 0003, abstract, FIGS. 1 and 2) JP-A-9-187916 (paragraphs 0015, 0016, abstract, FIG. 4) Japanese Patent Laid-Open No. 2001-191489 (summary, FIG. 2)

  The present invention has been made in view of the above circumstances, and there is no risk of the printed surface (coating surface) of the sheet becoming dirty, and it prevents the occurrence of scratches and stains on the paper surface due to the drying of deposits on the outer peripheral surface of the intermediate cylinder. In addition to greatly improving print quality and reducing waste paper, it can be used in a drying device without sheet fluttering or sagging, and the sheet can be transported stably. It is an object of the present invention to provide a practically extremely effective double-sided sheet-fed printing press that can improve drying efficiency and can be uniformly dried to enable high-quality printing.

  The present invention has been made to solve the above-described problems, and adopts the following means (1) to (6).

  (1) A double-sided sheet-fed printing press as a first means includes a plurality of sets of intermediate cylinders as means for transferring and transferring sheets between a coating unit on the printing unit side located upstream and a printing unit located downstream. In the double-sided sheet-fed printing press provided, the first intermediate provided with a gas blowing means for blowing gas such as air toward the outer peripheral surface of the intermediate cylinder whose peripheral surface is in contact with the printed surface side after printing upstream. A cylinder and a second intermediate cylinder provided with a gas suction means for sucking a gas such as air toward the inner peripheral surface of the intermediate cylinder on the downstream side of the first intermediate cylinder. It is a feature.

  (2) The double-sided sheet-fed printing press as the second means is the one of the first means, wherein the gas blowing area of the gas blowing means has a width in which the sheet may come into contact and a circumferential section. It is characterized by having comprised only.

  (3) The double-sided sheet-fed printing press as the third means is the first means or the second means, and the gas blowing timing of the gas blowing means is the cylinder rotation direction in which the sheet may come into contact. The sheet holding range is configured as described above.

  (4) The double-sided sheet-fed printing press as the fourth means is the one of the first means, the drying device for drying the sheet around the second intermediate cylinder, and the downstream side of the second intermediate cylinder The intermediate cylinder is provided with a third intermediate cylinder provided with a cold air spraying device for cooling the sheet.

  (5) The double-sided sheet-fed printing press as the fifth means is characterized in that, in the fourth means, the preheated gas is blown out from the gas blowing means of the first intermediate cylinder. is there.

  (6) The double-sided sheet-fed printing press as the sixth means includes the cold air spraying device for maintaining the cylinder surface temperature of the second intermediate cylinder at an appropriate temperature in the fourth means or the fifth means. It is characterized by that.

  The invention according to each claim described in the claims employs the means described in the above (1) to (6), and thus has the following effects.

  (1) The invention according to claim 1 employs the first means, and the first intermediate cylinder is provided with the gas blowing means, so that the printing surface (coating surface) of the sheet is the outer periphery of the first intermediate cylinder. The sheet can be conveyed without being brought into contact with the surface, and there is no possibility that the printing surface (coating surface) of the sheet becomes dirty.

  In addition, since the ink (coating liquid) on the printing surface of the sheet does not transfer and adhere to the outer peripheral surface of the intermediate cylinder, it is possible to prevent the occurrence of scratches and smudges on the paper surface due to drying of these deposits. As a result, the amount of waste paper can be reduced.

  In addition, since the second intermediate cylinder to be engaged is provided with the gas suction means, it can be adapted to the drying device in a state where there is no fluttering or sagging of the sheet, and the sheet is stably transferred to improve the drying efficiency. be able to.

  (2) The invention according to claim 2 employs the second means, and in the first means, the gas blowing area of the gas blowing means has a width with which the sheet may contact, And since it comprised only as the area of the circumferential direction, in addition to the said effect which the invention which concerns on Claim 1 has, it can save the usage-amount of blowing gas by this.

  (3) Since the invention according to claim 3 employs the third means, it is possible to improve the print quality in addition to the function and effect of the invention according to claim 1 or claim 2. And performance is stable.

  (4) Since the invention according to claim 4 employs the fourth means, in addition to the above-described operation and effect of the invention according to claim 1, the drying provided in the peripheral portion of the second intermediate cylinder The sheet can be uniformly dried by the apparatus, and the sheet heated at the temperature for drying is cooled by the cold air blowing apparatus provided in the third intermediate cylinder, and the water is evaporated to polymerize the varnish. And the curing of the ink can be promoted, and the printing quality can be further improved.

  (5) Since the invention according to claim 5 employs the fifth means, in addition to the above-mentioned operation and effect of the invention according to claim 4, the preheated heat blown from the gas blowing means of the first intermediate cylinder By preheating the sheet with the gas thus produced, the sheet can be sufficiently dried even in high-speed printing.

  (6) Since the invention according to claim 6 employs the above sixth means, the cool air blowing device blows cold air onto the body surface of the second intermediate cylinder to maintain the body surface temperature at an appropriate temperature, thereby drying. It is possible to prevent overheating of the sheet by the apparatus.

  The best mode for carrying out the present invention will be described based on Examples 1 and 2 below.

  FIG. 1 is an explanatory diagram showing the overall schematic configuration of a double-sided sheet-fed printing press according to a first embodiment of the present invention, FIG. 2 is a configuration explanatory diagram of a first intermediate body portion in FIG. 1, and FIG. It is a cross-sectional view of 1 intermediate body part. FIG. 4 is an explanatory diagram of the configuration of the second intermediate body in FIG.

  Example 1 was made to solve the problems in the prior art, and the overall schematic configuration of the double-sided sheet-fed printing machine according to Example 1 is the same as the conventional one shown in FIG. In FIG. 1, parts (components) common to the conventional one shown in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted.

  By the way, in the first embodiment, the first intermediate engaged with the impression cylinder 5b of the back surface coating unit 36 in the middle between the back surface coating unit 36 on the back surface printing unit 1 located upstream and the front surface printing unit 2 located downstream. The body 3a is provided with gas blowing means 7 for blowing a gas such as air toward the outer peripheral surface of the cylinder, and the first intermediate cylinder 3a is configured as a gas blowing cylinder.

  The first intermediate cylinder 3a blows a gas such as air toward the outer peripheral surface of the cylinder by the gas blowing means 7 so that a gas layer is formed between the traveling seat 4 and the outer peripheral surface of the first intermediate cylinder 3a. It is composed.

Next, based on FIG. 2, FIG. 3, the structure of the 1st intermediate body 3a and the function of the gas blowing means 7 are demonstrated.
The first intermediate body 3 a includes a cell (main body) 13, a rotation shaft 14 that integrally rotates the cell 13, and a shaft 15.

  Two gas boxes 11 (11 a, 11 b) for sending compressed gas are provided in a part of the outer peripheral surface of the cell 13, and the length of the gas box 11 in the trunk circumferential direction is formed corresponding to the length of the sheet 4. It is. Further, a plurality of gas blowout holes 48 opened to face the outer side of the cylinder are formed in the outer peripheral surfaces (surfaces forming the outer peripheral surface of the cylinder) of the gas boxes 11a and 11b.

  The gas boxes 11a and 11b are connected to the gas holes 12 (12a and 12b) in the shaft 15 through connecting pipes 43 (43a and 43b), respectively, and move in the axial direction by the operation of the air cylinder (actuator) 45. The gas piping 49, the solenoid valve (control valve) 8, the valve (control valve) 52, and the blower (compressed gas applying means) via the opening of the switching valve (switching means) 46 for switching the gas blowing location ) 10, and together with adjusting the strength of the blown gas, the operation timing for stopping the supply of compressed gas can be set appropriately.

  The adjustment of the strength of the blown gas and the setting of the operation timing for stopping the supply of compressed gas are performed by controlling the electromagnetic valve 8 and the like by the control device 51 in conjunction with the sheet supply device 19, but manually. You may make it perform.

  According to the gas blowing means 7 configured as described above, the blower 10 is actuated to send compressed gas through the valve 52, the electromagnetic valve 8, and the gas pipe 49, thereby the cell 13 of the first intermediate cylinder 3a. The inside of the gas box 11 provided at the inside is at a predetermined pressure, and the gas is blown out toward the outer peripheral surface of the body through the plurality of gas blowing holes 48 formed in the outer peripheral surface of the cell 13. it can.

  For this reason, the sheet 4 engaged with the outer periphery of the cell 13 by the claw device 26 has a slight gap due to the gas layer formed by the gas blown from the outer peripheral surface of the cell 13 as shown in FIG. Then, it is fed to the next second intermediate cylinder 3b.

  In the present embodiment, the intermediate cylinder corresponding to the UV drying device 6, that is, the second intermediate cylinder 3 b engaged with the wake of the first intermediate cylinder 3 a is directed toward the inner peripheral surface of the cylinder. A gas suction means 50 for sucking a gas such as air is provided, and the second intermediate cylinder 3b is configured as a vacuum suction cylinder.

  The second intermediate cylinder 3b is configured as shown in FIG. 4 and has substantially the same configuration as the first intermediate cylinder 3a shown in FIG. 2, but the cell 13 of the first intermediate cylinder 3a shown in FIG. The second intermediate cylinder 3b shown in FIG. 4 is provided with a suction box 17 (17a, 17b) in place of the gas box 11 on the outer peripheral surface, and a plurality of gases instead of the gas blowing holes 48 are provided on the outer peripheral surface. A suction hole 16 is formed.

  The suction boxes 17a and 17b are connected to the suction holes 44 (44a and 44b) in the shaft 15 through the connecting pipes 43 (43a and 43b), respectively, and are moved in the axial direction by the operation of the air cylinder 45 to suck the gas. It is connected to the suction pipe 9, the electromagnetic valve 8, and the suction machine (suction force applying means) 47 that is a gas suction source via the opening of the switching valve 46 that switches the location, and the suction stop is performed together with the suction strength adjustment The operation timing can be appropriately set.

  It should be noted that although the adjustment of the suction intensity and the setting of the operation timing for stopping the suction are performed by controlling the electromagnetic valve 8 and the like by the control device 51 in conjunction with the sheet feeding device 19, they should be performed manually. May be.

  According to the gas suction means 50 configured as described above, the suction machine 47 is operated to suck the gas through the electromagnetic valve 8 and the suction pipe 9, thereby being provided in the cell 13 of the second intermediate cylinder 3b. The inside of the suction box 17 has a predetermined negative pressure, and gas can be sucked toward the inner peripheral surface of the cylinder 13 through a plurality of gas suction holes 16 formed in the outer peripheral surface of the cell 13.

  Therefore, the traveling sheet 4 travels while being sucked and held on the outer peripheral surface of the second intermediate drum 3b, and is made to correspond to the second intermediate drum 3b while being sucked and held on the outer peripheral surface of the second intermediate drum 3b. Then, it is dried by the UV drying device 6 and sequentially transferred.

  Note that the first intermediate cylinder 3a shown in FIG. 2 and the second intermediate cylinder 3b shown in FIG. 4 are structurally different from each other even though there is a difference in function between a gas blowing cylinder and a vacuum suction cylinder. Can adopt the same structure, which is very convenient in design.

  The double-sided sheet-fed printing press according to the first embodiment is configured as described above, and the overall function of the printing press is the same as that of a conventional general double-sided sheet-fed printing press. In the middle of the backside coating unit 36 on the first side and the front surface printing unit 2 located downstream, the first intermediate cylinder 3a that engages with the impression cylinder 5b of the backside coating unit 36 is provided with gas blowing means 7 on the outer peripheral surface of the cylinder. Since the gas is blown out in the direction, the sheet 4 is coated between the printed surface on the back side and then transferred to the first intermediate cylinder 3a. A layer can be formed.

  The gas blowing area is switched and set via the air cylinder 45 so as to have only a width in which the sheet 4 may come into contact and a section in the circumferential direction. The gas blowing timing in the outer peripheral direction is also switched and set by the switching valve 46 so as to be in the sheet holding range in the cylinder rotation direction in which the sheet may come into contact.

  When the printing press is started and stopped, the solenoid valve 8, the blower 10 and the suction device 47 are operated at the best timing via the control device 51.

Thus, in the double-sided sheet-fed printing press according to the first embodiment, the first intermediate cylinder 3a is configured as a gas discharge cylinder.
(1) The printing surface (coating surface) of the sheet can be conveyed without contacting the outer peripheral surface of the first intermediate cylinder 3a, and the printing surface (coating surface) of the sheet 4 does not become dirty.
(2) Since the ink (coating liquid) on the printing surface of the sheet does not transfer and adhere to the outer peripheral surface of the intermediate cylinder, it is possible to prevent generation of scratches, stains, and the like on the paper surface due to drying of these deposits.
(3) Print quality can be greatly improved and paper loss can be reduced.

In addition, since the second intermediate cylinder 3b that engages with the first intermediate cylinder 3a is configured as a vacuum suction cylinder,
(4) The sheet can be made to correspond to the UV drying device 6 without the sheet 4 fluttering or drooping.
(5) The sheet 4 can be stably transferred to improve the drying efficiency.
Etc. can be obtained.

  However, as an application example of the first embodiment, if a plurality of sets of back surface printing units (1a to 1n) and front surface printing units (2a to 2n) are arranged above and below the sheet pass line shown in FIG. The present invention can also be applied to a double-sided sheet-fed printing machine for multicolor printing in which not only one color but also multicolor printing is performed.

  In Example 1, the back side printing is performed upstream and the front surface printing is performed downstream. However, on the contrary, the double-sided sheet is arranged so that the front surface printing is performed first and then the back surface printing is performed. It can also be applied to leaf printing machines.

  In addition, when there is a backside coating, it is necessary to use the intermediate cylinder as a gas blowing cylinder in terms of preventing contamination, but it is also possible to blow out gas that has been heated in advance in order to promote drying of the back printed surface. It is also possible to print on the backside printing unit before entering the intermediate cylinder, and after irradiating with UV irradiation for the purpose of drying, it is possible to blow cold air on the sheet for the purpose of cooling, after the intermediate cylinder configured as a vacuum suction cylinder An intermediate cylinder configured as a gas blowing cylinder can also be arranged in the flow.

  FIG. 5 is an explanatory diagram showing an overall schematic configuration of the double-sided sheet-fed printing press according to the second embodiment of the present invention, and FIG. 6 is a configuration explanatory diagram of the connecting portion 3 in FIG.

  Example 2 was also made to solve the problems in the conventional technology, and the overall schematic configuration of the double-sided sheet-fed printing machine according to Example 2 is the same as the conventional one shown in FIG. 5, parts (parts) common to the conventional one shown in FIG. 11 are denoted by the same reference numerals, and redundant description is omitted.

  In the second embodiment, the sheet is transferred and conveyed to the intermediate connecting portion 103 between the back surface coating unit 115 on the side of the back printing unit 102 for pre-printing located upstream and the front surface printing unit 108 for downstream printing located downstream. In the double-sided sheet-fed printing press provided with a plurality of sets of intermediate cylinders as means, a gas such as air is blown toward the first intermediate cylinder 104 located at the connecting portion 103 toward the cylinder outer peripheral surface in the same manner as in the first embodiment. A gas blowing means (not shown) is provided, and the first intermediate cylinder 104 is configured as a gas blowing cylinder. A gas blowing means connected to the cylinder interior 121 allows gas such as air to flow from the gas blowing hole 119a toward the outer peripheral surface of the cylinder. A gas layer is formed between the blowing and traveling sheet and the outer peripheral surface of the first intermediate cylinder 104.

  Further, the second intermediate cylinder 105 is provided with a gas suction means (not shown) for sucking gas toward the cylinder inner peripheral surface in the same manner as in the first embodiment, and the second intermediate cylinder 105 is configured as a vacuum suction cylinder. Gas such as air is sucked from the gas suction hole 119b toward the cylinder interior 120 by the gas suction means, and the sheet is brought into close contact with the second intermediate cylinder 105 so that the sheet does not hang down.

  Incidentally, in the second embodiment, as shown in FIG. 6, a drying device 113 having an irradiation lamp 114 is disposed at the lower part of the peripheral portion of the second intermediate cylinder 105.

  The gas blowing means is provided with a hot air generating device (not shown) so that the gas heated beforehand by the hot air generating device can be blown out from the gas blowing holes 119a of the first intermediate cylinder 104.

  In addition, a cool air blowing device 116 that cools the surface of the second intermediate cylinder 105 by blowing cool air is disposed above the second intermediate cylinder 105, and the second intermediate cylinder 105 is located on the downstream side of the second intermediate cylinder 105. On the upper part of the third intermediate cylinder 106, a cold air blowing device 117 is provided for blowing the cold air to cool the sheet.

  Since the double-sided sheet-fed printing press according to the second embodiment is configured as described above, the sheet coated with the varnish by the back surface coating unit 115 after printing by the back surface printing unit 102 is transferred to the first intermediate cylinder 104. Will be.

  However, a gas layer is formed between the traveling sheet and the outer peripheral surface of the first intermediate cylinder 104 by the gas blown out from the gas outlet holes 119a toward the outer peripheral surface of the first intermediate cylinder 104. The surface coated with the varnish does not come into contact with the cylinder surface of the first intermediate cylinder 104.

  Further, since the gas blown toward the outer peripheral surface of the first intermediate cylinder 104 is a gas heated in advance by a hot air generator (not shown), the sheet is heated in advance by the first intermediate cylinder 104 while being transported. Will be.

  Next, the sheet is transferred to the second intermediate cylinder 105, and the surface not coated with ink or varnish comes into contact with the cylinder surface of the second intermediate cylinder 105. The sheet is sucked by a gas suction means (not shown). By sucking a gas such as air from the hole 119b toward the cylinder interior 120, the sheet is sucked and closely adhered to the second intermediate cylinder 105 without slack, so that the sheet does not hang down.

  In this state, ultraviolet rays or infrared rays are irradiated from the irradiation lamp 114 of the drying device 113 arranged at the lower part of the periphery of the second intermediate cylinder 105, and evaporation of the moisture of the ink and varnish applied to the sheet and a polymerization reaction occur. Drying will begin.

  In the process of irradiating ultraviolet rays or infrared rays from the irradiation lamp 114, the sheet is adsorbed on the cylinder surface of the second intermediate cylinder 105, and the distance between the sheet and the irradiation lamp 114 is constant. The sheet can be stably and uniformly dried.

  Further, as shown in FIG. 6, the cylinder diameter of the second intermediate cylinder 105 is considerably larger than the cylinder diameters of the first intermediate cylinder 104, the third intermediate cylinder 106, the fourth intermediate cylinder 107, etc., for example, twice the reference diameter or If the cylinder diameter is about three times, the sheet can secure a conveyance length in the second intermediate cylinder 105 so that sufficient irradiation of ultraviolet rays and infrared rays can be obtained from the irradiation lamp 114 of the drying device 113. Since the sheet is preheated by the hot air-like gas blown from the gas blowing holes 119a of the first intermediate cylinder 104, the sheet can be sufficiently dried by the drying device 113 even in high-speed printing.

  In addition, since the cold air spraying device 116 is disposed on the upper part of the second intermediate drum 105, the cool air spraying device 116 blows cool air on the surface of the second intermediate drum 105, and the irradiation lamp 114 of the drying device 113 performs the first operation. 2 It is possible to prevent the cylinder surface of the intermediate cylinder 105 from being heated excessively.

  Next, the sheet is transferred to the third intermediate cylinder 106. Since the cold air blowing device 117 is provided on the upper portion of the third intermediate cylinder 106, the cold air blowing device 117 blows the cold air, and the temperature is increased for drying. While the rising sheet is cooled, curing of the polymerized ink and varnish can be promoted.

  As described above, in the double-sided sheet-fed printing press according to the second embodiment, the factor that hindered the drying at the connecting portion 103 is eliminated, and it becomes possible to apply the varnish to both sides of the sheet with a single sheet passing. Also, it can respond to requests for high-quality printing.

  However, for example, instead of ultraviolet or infrared irradiation by an irradiation lamp used for drying, a drying apparatus that irradiates an electron beam or the like may be used.

  Moreover, if the drying is sufficient, the cylinder diameter of the second intermediate cylinder does not need to be 2 to 3 times the reference diameter, and can be designed to an appropriate cylinder diameter if necessary, and the number of intermediate cylinders is four. Needless to say, the number can be designed to an appropriate number as needed.

  In addition, this invention is not limited to the said Example 1 and Example 2, In the range which does not deviate from the summary of this invention, a various change can be added.

It is explanatory drawing which shows the schematic structure of the whole double-sided sheet-fed printing press based on Example 1 of this invention. FIG. 2 is a configuration explanatory view of a first intermediate body portion in FIG. 1. FIG. 3 is a cross-sectional view of a first intermediate body portion shown in FIG. 2. It is a structure explanatory drawing of the 2nd intermediate | middle trunk | drum in FIG. It is explanatory drawing which shows schematic structure of the whole double-sided sheet-fed printing press based on Example 2 of this invention. FIG. 6 is a configuration explanatory diagram of a connecting portion in FIG. 5. It is explanatory drawing which shows the schematic structure of the whole of the conventional common double-sided sheet-fed printing machine. FIG. 8 is an explanatory diagram of a configuration of an intermediate body disposed between a back surface printing apparatus (unit) and a front surface printing apparatus (unit) of the double-sided sheet-fed printing press illustrated in FIG. 7. FIG. 9 is an explanatory diagram of a configuration of an ink supply device unit F in FIG. 8 installed in the front surface printing unit. It is a structure explanatory drawing of the coating liquid (varnish) supply apparatus part of the G section in FIG. 8 installed in the back surface coating unit. It is explanatory drawing which shows schematic structure of the whole of the conventional double-sided sheet-fed printing machine provided with the drying means, the cooling means, etc.

Explanation of symbols

1 Back side printing unit 2 Front side printing unit 3 Intermediate cylinder (3a, 3b, 3c, 3d)
4 sheets 5 impression cylinders (5a, 5b, 5c, 5d)
6 UV dryer 7 Gas blowing means 8 Solenoid valve 9 Suction pipe 10 Blower 11 Gas box (11a, 11b)
12 gas holes (12a, 12b)
13 cell 14 rotating shaft 15 shaft 16 gas suction hole 17 suction box (17a, 17b)
DESCRIPTION OF SYMBOLS 18 Ink 19 Sheet supply apparatus 20 Feeder board part 21 Paper discharge apparatus 22 Sheet conveying apparatus 23 Sheet stacking apparatus 24 Intermediate cylinder 25 Intermediate cylinder 26 Claw apparatus 27 Paper discharge shaft 28 Endless chain 29 Paper discharge table 30 Paper feed table 31 Ink reservoir 32 Ink roller group 33 Printing plate 34 Plate cylinder 35 Blanket cylinder 36 Back surface coating unit 37 Surface coating unit 38 Wet water device 39 Varnish 40 Varnish reservoir 41 Varnish roller 41a Varnish roller 42 Plate cylinder 43 Connecting pipe (43a, 43b)
44 Suction hole (44a, 44b)
45 Air cylinder 46 Switching valve 47 Suction machine 48 Gas blowout hole 49 Gas piping 50 Gas suction means 51 Control device 52 Valve 101 Sheet supply device 102 Back surface printing unit 103 Connecting portion 104 First intermediate cylinder 105 Second intermediate cylinder 106 Third intermediate Cylinder 107 Fourth intermediate cylinder 108 Surface printing unit 109 Surface coating unit 110 Pressure cylinder 111 Paper discharge device 112 Cold air spraying device 113 Drying device 114 Irradiation lamp 115 Back surface coating unit 116 Cold air spraying device 117 Cold air spraying device 118 Intercolor intermediate drum 119a Gas Air outlet 119b Gas suction hole 120 Inside the cylinder 121 Inside the cylinder 122 Guide 123 Intercolor intermediate cylinder

Claims (6)

  In a double-sided sheet-fed printing press equipped with a plurality of sets of intermediate cylinders as means for transferring and transferring sheets between the coating unit on the upstream printing unit side and the printing unit located downstream, printing after printing upstream A first intermediate cylinder provided with gas blowing means for blowing out gas such as air toward the outer peripheral surface of the intermediate cylinder whose peripheral surface is in contact with the surface side; and an intermediate cylinder on the downstream side of the first intermediate cylinder And a second intermediate cylinder provided with a gas suction means for sucking a gas such as air toward the cylinder inner peripheral surface.   2. The double-sided sheet-fed printing press according to claim 1, wherein the gas blowing area of the gas blowing means is limited to a width in which the sheet may contact and a section in the circumferential direction.   The double-sided sheet-fed printing machine according to claim 1 or 2, wherein the gas blowing timing of the gas blowing means is set to a sheet holding range in a cylinder rotation direction in which the sheet may come into contact.   A drying device for drying the sheet on the periphery of the second intermediate cylinder, and a third intermediate cylinder provided with a cold air blowing device for cooling the sheet on the intermediate cylinder on the downstream side of the second intermediate cylinder. The double-sided sheet-fed printing press according to claim 1.   The double-sided sheet-fed printing press according to claim 4, wherein preheated gas is blown out from the gas blowing means of the first intermediate cylinder.   The double-sided sheet-fed printing press according to claim 4 or 5, further comprising a cold air blowing device for maintaining a cylinder surface temperature of the second intermediate cylinder at an appropriate temperature.

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