JPS5942959A - Method and apparatus for printing capable of varying length of printing on continuous sheet - Google Patents

Abstract

PURPOSE:To eliminate the excessive blank between adjacent printing faces by a method in which an endless belt carrying detachably and exchangeably a printing plate corresponding to a desired printing length is freely exchanged with various lengths of belts. CONSTITUTION:When making a multi-color printing on a continuous sheet through plural printing units, the continuous sheet 12 is held on a pressure cylinder 48 and a printing plate 78 and a desired length of printing is made. In each printing unit, an endless belt 46 connected to the printing cylinder 42 and a regulating cylinder 44, running at a given speed, is detachably and exchangeably provided with a printing plate 78 of a size crresponding to a desired printing length. A quick-drying flexo-ink is transferred from an anilox roll 86 to the printing plate 78. By exchanging the endless belt 46, the printing length on the continuous sheet 12 is varied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing method capable of changing the printing length on a continuous sheet 1 and an apparatus for carrying out the same, and more particularly relates to When performing multi-color printing by passing sheets 1 to 1 through multiple printing units, the sheets can be sequentially printed at any printing length within the circumferential length range of the endless belt, which will be described later, without being restricted by the circumferential dimension of the 1-plate cylinder. The present invention relates to a method and apparatus that can perform desired printing and can vary the printing length by a simple belt replacement operation.

In a rotary printing press, a long continuous sheet is fed between a plate cylinder and an impression cylinder equipped with a curved printing plate, and printing is performed by the pinching pressure of the two eyelids. The size is generally determined by the circumferential dimension of the plate cylinder. In other words, it is impossible to print anything less than the entire circumference of the plate cylinder, and when printing with a printing plate smaller than the circumference on the plate cylinder, a continuous sheet is printed every rotation of the plate cylinder. This method has the disadvantage that it is extremely wasteful because blank spaces are created between adjacent printed surfaces. In order to deal with this drawback, before printing, the supplied continuous sheet 1- is cut into sheets of appropriate size using a cutting device, and a printing plate of a size corresponding to the paper size is mounted on the plate cylinder and printing is carried out. An all-sa rz rotary press has been proposed, but
Since this method assumes sheet 1-cutting before printing, it is excluded from category 1 of printing on continuous sheets, and is not suitable for high-speed printing.

Furthermore, as another means of printing arbitrary dimensions on the continuous sheet 1- without cutting it, it is conceivable to replace the plate cylinder with the circumferential dimension corresponding to the desired printing dimension each time. In this case, it is necessary to prepare a desired number of plate cylinders with different circumferential dimensions, which increases manufacturing costs, complicates the structure of the printing machine, and requires a large number of steps, making it difficult to use in practice. . In this way, in rotary printing on a continuous sheet, the circumferential dimension of the plate cylinder generally determines the printing length of the sheet.
J-method) and without creating wasted margins between each print.

However, there has long been a desire in industry to perform high-speed printing on webs or other continuous sheets at arbitrary printing lengths without cutting them. -For example, in a corrugator line that continuously produces corrugated cardboard,
Using a long rolled-up core paper liner as a raw material, the liner is adhesively laminated to the corrugated corrugated top part of the core paper which has been subjected to corrugation 1-1 to produce single-sided corrugated board or double-sided corrugated board. However, the printing on the obtained corrugated cardboard is not carried out in a corrugator line, but after it is cut in a predetermined -=J direction to form sheet-fed corrugated cardboard. by the way,
Taking double-sided corrugated cardboard as an example, as shown in FIG.
And the back liner 6 has a flan 1-. However, each liner has a part A supported by the corrugated top part (so-called peak part) of the corrugated paper, and a so-called valley part which is not supported by the said corrugated top part. Printing pressure is not applied evenly, which tends to cause shading and color unevenness.

Therefore, in order to print clearly and uniformly on corrugated cardboard, it is preferable to print on the liner in a continuous sheet before laminating the liner and core paper. Apart from cases in which printing is performed according to the circumferential dimensions of the cylinder as a repeated wood grain pattern (for example, with the Hinoki machine), as mentioned above, printing can be done at high speed without creating margins at the printing length of the specified size. It is impossible to print on liner, and its realization has been long awaited.

In addition, if a corrugated board is formed and then passed through a rotary printing machine and compressed between a plate cylinder and an impression cylinder, there is a concern that the compressive strength of the corrugated board itself will decrease. If this is done, such concerns will be completely eliminated, which is desirable from this point of view as well.

As described above, there has been a long-standing demand in the industry to print on continuous sheets at a desired print length and at high speed without creating margins between adjacent printing surfaces. The present invention has been devised to satisfy such demands.

Furthermore, when printing on continuous sheets, after printing a small lot, it is often necessary to print another order with a different printing length. In this case, it is desirable to be able to quickly exchange printing plates of different sizes so as not to reduce printing efficiency.

The present invention has been devised in view of the results of these studies, and it is possible to perform multicolor printing by passing the continuous sheet 1~ fed out from a winding roll through a plurality of printing units 1-. In each printing unit, an endless belt is run, which removably carries a printing plate having a size corresponding to the printing length, and which can be freely replaced with bells 1- of various lengths as necessary.
The continuous sheet is pressed against the printing plate attached to an endless belt to print the desired printing length, and then the continuous sheet is passed close to a drying unit installed in each printing unit to dry the ink. printing and r
7. The present invention provides a printing method characterized in that the printing length of the continuous sheet is changed by repeating the drying process in each printing unit and replacing the endless bells 1 to 1.

Further, as a suitable device for carrying out this printing method, another invention of the present application is a bell h which is composed of a plate cylinder and an adjustment cylinder disposed so as to be able to freely move and adjust the distance between the axes with respect to the two cylinders (1i). An endless belt that removably carries a printing plate set to a desired printing length is replaceably wound around the drive unit, and the impression cylinder can be moved toward and away from the plate cylinder by sandwiching the endless belt. A printing mechanism is configured by arranging them facing each other, and by arranging a drying unit 1- for drying ink corresponding to the printing mechanism, a printing unit 221- is configured independently, and this printing unit 1- The present invention provides a printing device characterized in that a plurality of printers are arranged spaced apart in series.

Next, the printing method according to the invention of the present application will be described in detail below with reference to the accompanying drawings in connection with an explanation and effects of an embodiment of a printing device suitably used to carry out the method. In the printing apparatus of the present invention shown in FIGS. 2 and 3, reference numeral 10 indicates a printing unit 1-, and each of the printing units 1 to 10 has a belt-type printing machine groove, which will be described later in connection with FIG. It is built-in and can independently print on continuous sheets 1 to 12.

The printing apparatus according to the present invention is configured by arranging a plurality of printing units IO in series at a predetermined interval +1IIL, and in this embodiment four units are arranged, but this arrangement The number can be increased or decreased as needed. On the upstream side of these series of printing units 1-10, there are two
A splicer 18 is provided to chuck and hold two base paper rolls 14, 14 on a mill roll stand 16, and automatically splice the paper to the other base paper roll 14 when only a small amount of one base paper roll 14 remains. , this O1
- The continuous sheet 12 is continuously supplied from the splicer 18 toward the printing unit 10. Further, on the downstream side of the series of printing units 10, there is a festival 1-22 consisting of a group of dancer rolls 20 for temporarily retaining and storing the printed continuous sheet 1 while running the sheet 12 thereon. A winding device 24 that winds the continuous sheet 12 fed from the festivals 1 to 22 into a roll.
are arranged respectively.

In this embodiment, the continuous sheet 12 after printing is temporarily wound up;
is directly incorporated into this corrugator line, and the printed corrugated board liner can of course be used as is without being wound up.

In FIG. 3, the printing apparatus of the present application includes an electric motor (not indicated by reference numeral 26) as a common driving source, and the output of the electric motor 26 is transmitted through a belt 28 to the line shirt 1 shown in the figure.
-30 is connected to I, and the line shirt I.
30. Said line shirt L-3 (L is name printing unit L~10, FES 1-
-n 22 and Wa rnde C n) Master force axis 3 of I device 24
A gear box 34 and a line shirt 1-3 are arranged perpendicularly to the input shaft 2 and correspondingly provided at the end of each of the input shafts.
By connecting the printing unit 1-JO, the festoon 22, and the winding device 24 of the printing unit 1-JO, the printing unit 1-JO, the festoon 22, and the winding device 24 of the printing unit 1-JO, the printing unit 1-JO, the festoon 22, and the winding device 24 are driven in a constant-velocity synchronous manner.

By the way, on the right side of FIG. 3, there is a drag roll (described later) for sheet tension indicated by reference numeral 3G, and a rotary unit 1 such as the festoon 22 and the winding device 24.
The input shaft 32 of - is connected to the gear box 34 via a coupling 38, and each input shaft 32 of the series of printing units 10 is connected to an electromagnetic clutch 4.
0 to the gearbox 32. The electromagnetic clutch 40 is selectively activated by a predetermined electric command, and freely transmits and disconnects power from the line shirts 1 to 30 to the input shafts 32 of the corresponding printing units 1 to 10. It is configured to obtain. That is,
During the rotation of the shaft 1-30, in the section of the series of clutches 40 in which the clutch is released by the power transmission disconnection command, the corresponding printing unit 1
-10 stops rotating, and in the section where the clutch release operation is not performed, the corresponding printing units 1 to 10 are rotationally driven.
It will be L. In the J'1, O. Mei 3, and II books, the clutch 40 is mainly referred to as an electromagnetic clutch that uses an electric component to open and close electromagnetically. , I (any of the pure mechanical clutches).

Next, details of the printing mechanism built into the printing unit 10 of the apparatus of the present invention will be explained with reference to FIG. 2 and especially FIG. 4. This printing mechanism IJ,, 1121842,
The adjustment cylinder 44 is disposed so as to be movable up and down, and the distance between the axes of the plate cylinder 42 can be arbitrarily set, and the plate cylinder 42 is wrapped around the outer periphery of the adjustment cylinder 44. 4j411 end bell 1-
46, an endless bell I-/I Ci interposed therebetween, a pressure 111i 148, and a pressure 111i 148 disposed opposite to the plate cylinder 42 so as to be freely in contact with the plate cylinder 42. That is, the plate 11 [il 42 is rotatably supported on a machine frame (not shown) via a rotating shaft 50, and a driven gear 52 attached to the rotating shaft 50 is attached to the in-shirt 1-30 as described above. The plate cylinder 42 is rotated by touching a vinyl A 54 fixed to the connected input shaft 32. Note that one end of the rotating shaft 50 is connected to a differential gear device 5G for phase adjustment.
(for example, the trade name Harmonic Drive), and the other end has a fi
Utanu's handle 58 has been removed. Also,
Timing pulleys 60 are located at both ends of the plate cylinder 42.
The timing boots 1-62 provided on the inner edges of the bells 1-46, which will be described later, ensure reliable transmission.

The adjustment cylinder designated by the reference numeral 44 has each end of its rotating shaft 64 rotatably supported by the bearing box 6G, and is further rotatably supported by the bearing box 6G.
6 is supported in a state where it is screwed and pushed through a screw shaft 68 which is vertically arranged and arranged. The lower end of the screw shaft 68 is connected to a rotation source (not shown) via a bevel gear 70, 70, and therefore a pair of screws Φl! +G8. If f3B is rotated synchronously, the adjustment cylinder 441 pivotally supported by the il'llll receiver box 66, 66 will be moved down ↓7, and the distance between the axes of the adjustment cylinder 4 tl such as the plate 11) i42 can be adjusted freely. It is understood that proximity and separation can be adjusted. Note that the bearing box 66 is provided with a horizontal protruding piece 72, and by storing this in the fPW of a guide column 74 that stands close to and parallel to the screw shaft 68, the bearing box 66 when the screw shaft 68 rotates. This is to smoothly guide the R1 descent. Also, adjustment) IF1
Timing pulleys 76 are also fixed to both ends of the plate 44 for the same purpose as in the case of the plate 111ii42.

The bell 1-drive section consisting of the forme cylinder 42 and the adjustment cylinder 44 is made of, for example, polyester resin. An endless belt 46 of a predetermined width is wrapped around it. As described above, this endless belt 46 has timing bells 1-62 fixed to both end edges of the groove 01, and the plate cylinder 46
The endless bells 1 to 46 have a printing plate 7 made of a flexible material engraved with desired printing information on the outer circumference of the endless bells 1 to 46.
8 is fixed by appropriate means. The dimensions of the printing plate 78 and the endless belt 46 supported by the plate 78 are selected from various sizes depending on the printing dimensions required for the printing object, and the bearing box is adjusted according to this determination. The distance between the axial centers of the plate cylinder 42 and the adjustment cylinder 44 is adjusted by raising and lowering the cylinder 6G and 66. In conventional rotary printing presses, the "maximum printing on the same plate cylinder" method corresponds to the circumferential dimension of the plate cylinder.
Although it is impossible to print with dimensions larger than 2, it is possible to increase the printing 4° method to the extent of 1,111 hits by using a long belt 46 (center) in this belt-type printing machine groove. - It is possible to do the following:
For example, remove the tape that glues the seams of a belt/flc
By doing so, the belt can be easily removed from the plate cylinder 42 and the adjustment cylinder 44, and by attaching tape to each circle 11 (beam 1 - 1'1), the belt can be attached to the plate cylinder 42 and the adjustment cylinder 44. 14 times can be done.

Furthermore, an impression cylinder 48 is disposed facing one side of the return plate 111'M 42 (as shown in the figure) with a bell 1-46 (and a printing plate 78) interposed therebetween. 48 is located at the end of the rotating shaft 80 and is supported on the piston rod 134 of the air cylinder 82. Under the biasing action of the air cylinder 82, the pressure 114.8 is applied to the plate cylinder 42. The impression cylinder 48 is configured to be able to come into contact with and separate from the bell 1 (via 46).The impression cylinder 48 is separated from the plate cylinder 42 during printing plate replacement work, as will be described later, and when the printing operation starts, the impression cylinder 48 is moved away from the plate cylinder 42. ■It is controlled so that it comes into contact with 42.

Furthermore, in FIG. 4, reference numeral 8G is an anilox roll for ink transfer of the printing plate 78, 88 is an inkylonyl roll, and 9 is an ink transfer roll.
0 is an ink pan, 92 is an ink (11 is a ship nozzle, and the anilox roll 86 and ink roll 88 are connected and supported by a bracket 93 and a link lever 94, and Under the action of the connected air cylinder 98, the printing plate 78
Contact/separation control of the anilox roll 86 is performed. In addition, the tongue J'+100 provided on the bracket 93
The nip pressure between the anilox roll 86 and the printing plate 78 can be adjusted by applying an eccentric force, /, %102, to the anilox roll 86 and the printing plate 78.

Returning again to FIG. 2, each printing unit 10 has a drag roll 104 for pulling the continuous sheet 1-12 and a C trawl 10 for delivering the continuous sheet 1-12 on both sides of its belt-type printing mechanism.
A drying unit 1-108, each equipped with a hot air blowing hole at the top and bottom, is disposed between the two units 104 and 106. Each of the drying units 1-1 and 1-08 has a built-in heater 110 and a blower (not shown), and the hot air heated to a temperature suitable for drying the ink is used to dry the unit 108. It is grooved so that it blows out from the bottom. Further, as shown in FIG.
) 148 and is printed, the sheet 1-
The ink is dried by passing the printing surface of 12 in close proximity to the bottom and both sides of the drying unit 108, and is then supplied to the printing unit 10 on the downstream side.

The effects of the printing apparatus according to the present invention configured as described above will be explained below in relation to the printing method according to another invention of the present application. 2 and 3, the continuous sheet 12 fed out from the auto splicer 18 is sent to the first printing unit l-L Oa (fifth At this time, in each printing unit 10, as shown in FIG. An endless belt 46 runs at a predetermined speed, and the endless belt 46 has several removably replaceable printing plates 78 corresponding to a desired printing length.
There is no transfer of the quick-drying flexo ink from the anilox roll 86 to the printing plate 781.

And under the action of cylinder 82 the plate IJFil 'l
The impression cylinder 48 which is raised and separated from 2" and the endless belt 4G
During this time, the continuous sheet 1-12 is passed through, and when the running speed of the endless bell 1-46 is synchronized with the predetermined printing speed, the impression cylinder 48 is lowered toward the plate cylinder 42 4-J. As a result, the continuous sheet 12 is pressed between the impression cylinder 48 and the printing plate 78, and printing of a desired printing length is performed. As shown in FIG. 5, the continuous sheet 1-12 which was not printed in the printing unit 1-10a constituting the first printing section was then placed correspondingly above the printing unit I"lOa. drying unit h1
The ink is then passed close to the lower side of 0B and 10C, and is exposed to 1L of hot air blown from the drying unit 1-108, thereby drying the ink.

Since the series of printing units 110a to 10d are synchronously rotated by a common drive source via line shirts 1 to 30, the continuous sheets 1 to 12 that have passed through the printing units 1 to 10a are sequentially rotated downstream. is moored to the printing unit of
The printing and drying steps described above are repeated.

In addition, when it is necessary to change the print order or to change the print length on the continuous sheet 1-12 in response to other requests such as printing on the 1-1 sheet, the rotation of the 1st plate 11F1/12 is stopped. At the same time, the air cylinder 82 is activated to raise and hold the impression cylinder 48 at -, and then the endless belt 4G carrying the printing plate 78 is moved to the plate Jl.
) Removed from the i42 and adjustment cylinder 44, and replaced with a bell 1- provided with a printing plate 78 corresponding to the printing length of the new printing order. In this case, it is naturally possible that the circumferential dimension of the belt that needs to be replaced will be different from that of the belt that is newly installed, based on changes in the printing length of the printing order. At this time, as shown in FIG.
By raising and lowering G, the center distance of the plate IJ) i42 and the adjustment cylinder '14 is adjusted. In addition, endless belt 4G
The replacement itself can be accomplished very easily by peeling off the tape bonding the bell 1 joint as described above, and then reattaching the tape after replacing the bell.

As described above, according to the method and apparatus according to the present invention, when performing multicolor printing by passing the continuous sheet 1- through a plurality of printing units, the printing plate 1- In addition, the desired printing length can be easily changed by a simple bell replacement operation to easily change the printing length applied to the continuous sheet. For this reason, printing is applied in advance to a continuous sheet 1 used as a liner for two corrugated boards, such as a corrugator line for manufacturing corrugated board, for example.
The method and device according to the invention are particularly suitable for use in cases where it is required to maintain Moreover,
There are many advantages, such as being able to easily respond to production requests for small lots that frequently change production orders.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a double-sided corrugated board, Fig. 21-1 is a side view of an embodiment of a printing device preferably used for carrying out the printing method according to the invention of the present application, and Fig. Back side U:! showing the arrangement of the printing device shown in Figure 1. 1 and 4 are perspective views showing a schematic configuration of a 4L printing mechanism employed in the printing apparatus shown in FIG. 2, and FIG. 5 is a schematic explanation of the printing method according to the present invention. 10...Printing unit 1-12.) Insect v cosi-1.
42... Plate cylinder 44... Adjustment cylinder 46...
・Belt 78...1111 and 1108...
・Dried Uniso 1- Patent applicant: Isowa Iron Works Co., Ltd. Applicant's agent: Patent attorney Yoshiki Yamaki I;″′Bound 1
．． 1 No 4J1

Claims (1)

[Scope of Claims] (]) When performing multicolor printing by passing a continuous sheet fed out from a winding roll through multiple printing units, printing plates with dimensions corresponding to the desired printing length can be attached and detached and replaced. An endless belt carried on the belt and freely exchangeable with bells 1- of various lengths as necessary is run through each printing unit 1, and the continuous sheet is pressed against the printing plate attached to the endless belt. This prints the desired printing length, and then passes this continuous sheet close to the drying unit 1- provided in each printing unit 1- to dry the ink, and these series of printing and drying processes are carried out in each printing unit. A printing method characterized in that the printing length of the continuous sheet 1- is changed by repeating and replacing the endless belt. (2) A printing plate set to a desired printing length is detachably supported on the Pell 1 to drive unit, which is composed of a plate cylinder and an adjustment cylinder disposed so as to be able to move and adjust the distance between the axes of the plate cylinder. endless bell 1
- are exchangeably wound, and an impression cylinder is arranged opposite to the plate cylinder so as to be able to move toward and away from the plate cylinder, sandwiching the endless belt, to form a printing press groove, and an ink drying groove is formed in accordance with the printing mechanism. A printing apparatus characterized in that a printing unit is configured independently by disposing a drying unit, and several printing units are arranged in series at a distance from each other.