JPS5976261A - Apparatus for printing continuous sheet - Google Patents

Abstract

PURPOSE:To efficiently print a continuous sheet in a desired length to be printed, by constituting the titled apparatus from such a mechanism that a sheet pull and supply part is provided to the downstream side of a printing part and the continuous sheet is intermittently supply to the printing part while pulled at every a predetermined dimension. CONSTITUTION:A printing apparatus is constituted from a first sheet storage part 6, a printing part 8 and a sheet pull and supply part 20 which is, in turn, constituted from an arc shaped pull member 92 provided to the outer periphery of a disc cylinder 90 and a pressure cylinder 94 mutually contacted with said arc shaped pull member 92. Prior to operating the apparatus, the desired length to be printed of a continuous sheet 24 is determined while the arc shaped pull member 92 is moved to the periphery of the disc cylinder 90 and a pull dimension corresponding to the length to be printed is set. Subsequently, the continuous sheet 24 is set to the printing apparatus to operate the printing apparatus and intermittently supplied to the printing part 18 at every the set pull dimension to perform printing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous sheet printing device, and more particularly, it relates to a continuous sheet printing device, and more particularly to a continuous sheet printing device, and more particularly, a continuous sheet printing device that prints a web or other sheet at any printing length within the circumferential dimension of a plate cylinder of a rotary printing press. The present invention relates to a novel printing device that can sequentially perform desired printing on each scheduled printing section of a continuous sheet.

In an axial printing press in which 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 pressure between the two cylinders, the printing dimensions of the continuous sheet are: It is generally determined by the circumferential dimension of the plate cylinder. In other words, it is impossible to print with a method that is larger than the entire circumference of the plate cylinder.
In addition, when a printing plate with a circumference size or less is attached to the plate cylinder, printing is possible, but there is a disadvantage that there is a lot of waste because a margin is created between printings on the continuous sheet 1- every time one rotation of the plate cylinder. be.

Therefore, as another means of printing a continuous sheet using one method, it is conceivable to replace the plate cylinder each time with a circumferential dimension corresponding to the desired printing dimension, but in this case, the circumferential It is necessary to prepare as many plate cylinders of different sizes as desired, which increases installation costs, complicates the printing mechanism, and requires time and effort. In this way, continuous sheet rotary printing.

Generally, the circumference of the plate cylinder determines the print length on the sheet, so any printing length (of course within the range of the circumference of the plate cylinder) and the unnecessary margin between each printing are It was not possible to perform sequential printing without causing problems.

However, there has long been a desire in industry to perform high-speed printing on webs and other continuous sheets 1- such as webs, films, etc., at arbitrary printing lengths without cutting them. - For example, in a corrugator line that continuously produces one corrugated board, a long rolled core paper and a liner are used, and the liner is attached to the top of the corrugated corrugation of the core paper. are bonded together to produce single-sided or double-sided corrugated cardboard, but printing on the resulting corrugated cardboard is not done in a corrugator line, but after it is cut to a predetermined size and made into sheet-fed corrugated cardboard.

By the way, taking double-sided corrugated cardboard as an example, as shown in FIG.
The front liner 10 and the back liner 12 are joined to each other by a core paper 14 with a cylindrical shape, and in appearance, the front liner 10 and the back liner 12 form a flan 1-. However, each liner has a portion a that is supported by the corrugated top portion (so-called peak portion) of the core paper and a so-called valley portion that is not supported by the corrugated top portion. Printing pressure is not applied, 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 state before the liner and core paper are assembled. It is impossible to print on a liner at high speed without creating wasted margins with arbitrary printing lengths, except when printing according to the circumferential dimension as a repeating wood grain pattern (e.g. in a cypress machine). Its realization has been long awaited.

In addition, if the corrugated cardboard 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 cardboard itself will decrease. If this is done, such concerns will be completely eliminated, which is desirable from this point of view as well.

The present invention has been devised in view of the drawbacks inherent in the prior art, and does not require cutting of a web or other continuous sheet, and also eliminates wasteful margins between adjacent printed matter. It is an object of the present invention to provide a continuous sheet printing device that can perform printing at an arbitrary print length in a continuous state.

In order to achieve this object, the printing device according to the present invention has a continuous sheet fed out from a take-up roll at a predetermined Jf in a running state.
1 consisting of a sheet storage section in which the sheet is stored, a plate cylinder located downstream of the sheet storage section and equipped with a printing plate having a predetermined arc length dimension, and an impression cylinder disposed opposite thereto.
the continuous sheet is intermittently delivered to the printing section by pulling the continuous sheet by a predetermined length that is the same as or larger than the arc length dimension of the printing plate, and is located downstream of the printing section. The present invention is characterized in that it is composed of a sea 1 for supplying water to a tensile supply section and a tension supply section.

Next, the printing apparatus according to the present invention will be described in detail below with reference to the accompanying drawing. As an example, the description will be made in connection with a corrugator line for manufacturing corrugated cardboard, but the present invention is not limited thereto, and can of course be widely applied to printing of general webs, webs such as resin films, and other continuous sheets. be.

FIG. 2 is a side view, not showing the general structure, of the continuous sheet printing apparatus according to the present invention, and FIG. 3 is an example of the power transmission mechanism of the printing section and sheet tension supply section shown in FIG. 2'. FIG. In FIG. 2, the printing device is designated by reference numeral 1
It basically consists of a first sheet storage section indicated by 6, a printing section indicated by 18, and a sheet tension supply section indicated by 20, and in this order from the upstream side where the continuous sheet 1- runs toward the downstream side. Arranged. It should be noted that the block designated by the reference numeral 22 is an optional second sheet storage section required for synchronization with the line speed when installed in series in a corrugator line.

On the second stream side (not shown), a sheet winding roll is attached to a roll stand, and the continuous sheet 1-24 for the front liner that is unwound from this winding roll is composed of a roll group 26. The sheet 1- is supplied to the first sheet storage section 16, where the sheet 1- is retained for a predetermined length while maintaining its running state.

This first sheet storage section 16 is connected to the printing section 1 as described later.
When the seam 1-24 is intermittently tensioned and supplied to the seam 8, it functions to prevent excessive tensile force from acting on the seam 1-24 and breakage or deformation due to elongation. Therefore, various configurations other than the so-called festival 1-line structure using the dancer roll group 26 shown in the figure can be adopted as long as they fulfill this function. In addition,
The base frame 28 constituting the first sheet storage section 16 is movably disposed on a rail 30'' which is used in common with the printing section 18, which will be described later, via a wheel 111i32.

The printing section 18 located downstream of the first sheet 1-storage section 16 is connected to a first printing unit 34 and a second printing unit 1-1 so as to be able to perform two-color printing in the illustrated embodiment.
However, when monochrome printing is sufficient, one printing unit is used, and when multicolor printing of three or more colors is performed, three or more printing units are provided. The printing unit constituting this printing section 18 is basically a known rotary printing press, with wheels 3 on a common rail 30.
The plate J]1 is placed in the base frame 38, which is freely movable through the base frame 38.
40 and an impression cylinder 4 disposed oppositely above the plate cylinder 40.
It has 2. As shown in FIG. 3, the plate 11i40 is rotatably supported by bearings 46, 46 via its rotating shaft 44, and receives power transmission from a sheet tension supply section 20, which will be described later, via a gear train. The first printing unit 34 and the second printing units 1-36 are power-coupled by a bevel gear and a spline shaft. That is, in FIG. 3, a spur gear 48 is fixed to the rotating shaft 44 of the second printing unit h36, and the spur gear 48 is connected to the driving gear 50 of the sheet tension supply section 20, which will be explained in detail later, through a series of gear trains 52. Power is transmitted to 48 to rotate the plate cylinder 40. A bevel gear 54 is fixed to the tip of the rotating shaft 44, and this bevel gear 54 meshes with a one-digit bevel gear 58 set at the end of the spline shaft 56, and this spline shaft 5G is connected to the base. It is horizontally inserted into a bearing 60 set aside outside the frame 38 so as to be rotatable. As shown in the figure, the spline shaft 56 extends horizontally and parallel to the first printing unit 34, and is rotatably and axially mounted on a spline bearing 62 disposed outside the base frame of the first printing unit 1-34. It is inserted and fixed so that it can be slid in any direction. A bevel gear 64 is rotatably attached to this spline bearing 62, and this bevel gear 64 is a bevel gear 64 fixed to the tip of the rotating shaft 44 of the first printing unit 34.
It meshes with 6. Therefore, if the plate JIFi 40 of the second printing unit 1-36 is rotated in the direction of the arrow by the power transmitted by the gear train 52, the bevel gear 54.58
It is understood that the combination of these rotates the spline shaft 56 in the direction of arrow B, and the combination of the other bevel gears 64 and 66 drives the plate cylinder 40 of the first printing unit 1-34 synchronously at a constant speed and in the same direction. Good morning. Moreover, since the spline shaft 62 is configured to be slidable in the axial direction with respect to the spline bearing 62 and the bevel gear 64, by moving the first printing unit 34 along the rail 30'', the printing without interrupting the power transmission to the unit 34.
It can be spaced a predetermined distance from the printing unit 36. This is determined by setting the arc length of the printing plate 68 wound around the printing cylinder 40 and the distance between adjacent printing sections of the continuous sheet 24 supplied to the printing unit 18 to be large as necessary. It can be effectively used when

As shown in the figure, the plate cylinder 40 and the printing plate 68 are pressed by pressing JJF1.
In a type of printing device located below 42.

Printing is done on the bottom surface of the continuous sheet 1-24. For this reason,
Ink is transferred in a half-dry state to the bottom surface of the sheet 24 printed by each printing unit, and when it is carried by a conveyance roll and sent to the next process as in the past, the color transfers to the conveyance roll. Inconveniences may occur, such as the ink being retransferred to the printed surface and becoming unclear. Therefore, in this embodiment, a vacuum suction source (not shown) is provided on the horizontal traveling path of the continuous sheet 24.
A negative pressure surface 70 is provided, and a predetermined number of through holes 72 are formed in the lower surface of the negative pressure surface and are positioned so as to face the upper surface of the sea 1-24. Then, when the negative pressure surface 7o is made negative pressure, the continuous seams 1 to 24 are vacuum-adsorbed on the upper surface and run in a floating state, so that the lower surface of the continuous seams 1 to 24 comes into contact with other obstacles to the sea 1 where the ink is transferred. Since the ink is sent to the next process without any problems, the sharpness of the printed surface will not be impaired due to color transfer or ink retransfer as described above. Moreover, the negative pressure surface 7
Due to the adsorption action of the continuous sea 1-24 by the sea!
Since a braking force is applied to -, an appropriate tension can be applied to the sheet 24 by adjusting the suction force. It is more preferable to provide several guide abutment plates 74 on the lower surface of the negative pressure surface 70, the ends of which are slightly curved toward the sheet arrival direction.

Further, in FIG. 2, reference numeral 76 indicates an anilox roll for flexographic ink transfer, 78 indicates a rubber roll for ink mixing, 80 indicates an ink supply nozzle, and 82 indicates an ink pan. In addition, 1 is facing each other with C 1 to 24 in between.
A pair of rolls 84 and 86 are arranged to thread the sheet at the start of printing, and the rolls 84 and 86 are energized by the cylinder 88.
6 presses the sheet 24 together with the roll 84 and sends it to the downstream side. Furthermore, the code 89 tJ:
, No hot air supply box is shown for forced drying by blowing warm air onto the printed surfaces of sheets 1 to 24.

Next, details of the seal tension supply section 20 disposed downstream of the printing section 18 will be explained. The sheet tension supply unit 20 includes a cylinder 90 having a smaller outer diameter than the plate cylinder 40 of the printing unit 18, and a plurality of arc-shaped sheets that are movable and adjustable in the circumferential direction of the cylinder 90 and arranged in the axial direction. It basically consists of a tensioning member 92 and an impression cylinder 94 which is located above the cylinder 90 and rotates in contact with the arcuate tensioning member 92. That is, the cylinder 90 is set to have the same width as the plate cylinder 40 (this width is set larger than the maximum width of the continuous sheets 1 to 24) as shown in FIG. The diameter is set smaller than the diameter of the plate cylinder 40, and the ll1l receivers 46, 46 are connected to each other via the rotating shaft 96.
It is rotatably supported on the shaft.

The driving gear 50 is fixed to the tip of the rotating shaft 96, and is driven by an electric motor (not shown) to rotate the cylinder 90 in the direction of arrow C, and also to rotate the cylinder 90 via the gear train 52. 40.

A tension member 92 having a circular arc with a center angle of 90° is provided on the outer periphery of the cylinder 90 so as to be movable in the circumferential direction, and the tension member 92 is spaced apart by a predetermined distance in the axial direction of the cylinder 90.
It is arranged. However, one of the four tension members 92
The plate is fixed to the cylinder 90 and cannot be moved in the circumferential direction. In addition, the other three arc-shaped tension members 9
2 is rotatable at a predetermined center angle in the circumferential direction of the cylinder 90 by three running registers (not shown). Therefore, by appropriately adjusting the rotation angles of the four arcuate tension members, a circle 11ii9 can be obtained as shown in FIG.
An arcuate protrusion that comes into contact with the impression cylinder 94 is formed in the circumferential direction of the cylinder 90 within a range of 90''≦α≦360° with respect to the axis of 0. The radius of the arc-shaped portion of the section is set to match the radius of the plate cylinder 40, and the arc length of the arc-shaped portion is
This is the size from the sea 1 to the drawer when the continuous sea 1 is compressed and pulled together with the impression cylinder 24. In the embodiment (not shown in FIGS. 2 and 3), two sets of two arc-shaped tensile parts 1f) UO3 having a phase angle of 90 degrees are arranged in parallel to form an arc shape with a central angle of 180 degrees. Continuous sea 1-2 because the protrusion is obtained
4 is pulled out by 172 dimensions of the entire length of the plate cylinder 40. In addition, in this embodiment, since the center angle of the arcuate tension member 92 is 90° as described above, four members are provided, and a maximum of three
I tried to cover 60° (90° x 4 = 360
°), it is possible to change the number of arranged sheets and other conditions as necessary.

For example, three arc-shaped tension members 02 with a central angle of 120° may be provided (120° x 3 = 360°), and the printing size for one printing needs to be smaller than the plate cylinder circumference of 174. In such a case, the central angle of the arcuate tension member 92 may be set within 90 degrees, and the number of arcuate tension members 92 may of course be increased.

In FIG. 2, reference numeral 98 indicates a roll for changing the direction of sheet delivery. Also, the second sea 1 indicated by reference numeral 22
- the storage is a phase 1-- consisting of a dancer roll IF 100, for example, which is used for printing with a corrugator line, such as when this continuous sheet printing device is connected in-line to the corrugator line; This is an optional equipment that is installed in order to synchronize the speeds between the two devices since the feed speeds are different between the two devices.

The operation and effects of the continuous sheet printing apparatus of the present invention 1 constructed as described above will be described below.

Prior to operation of the apparatus, the desired print length for the continuous sheet 24 is determined; this depends on the tension of the printing plate 68 mounted on the plate cylinder 40), then the sheet tension is 0 (the length of the printing plate 68 mounted on the plate cylinder 40); By activating the running I nozzle and moving the arcuate tension member 92 around the cylinder 90, a tension dimension corresponding to the printing length is set.For example,
In the embodiment shown in FIGS. 2 and 3, the arc length dimension of the printing plate 68 mounted on the plate cylinder 40 is 172 mm of the circumference of the plate cylinder, so the arc-shaped tension member 92 in The central angle of the arc formed by the entire tensioning member 92 is set to be 180°, and the arc length is made to match the arc length of the printing plate 68 .theta.mi.

In this way, when the sheet tensile dimensions are determined, the continuous sheet 1-24 is sent to the printing device, but in this case, the continuous sheet 1-24 is placed on the upstream side of the printing section 18-. Sheet 1 - In the storage section 16, the sheet 24 is retained for a predetermined length in the running state, and the adjustment is completed in 1] 11- so that the sheet can be fed quickly and smoothly.Sheet 1- If the printing device is started after the threading is completed, sheets 1-2 will be rotated every time the cylinder 90 rotates once.
4 is intermittently pulled by the arc length dimension (-1/2 of the plate cylinder circumference) of the printing plate 8 under the pinching action of the arc-shaped tensioning member 92 and the impression cylinder 94, so that each printing unit h ( 34, 36) Advance inside. If the printing plate 68 of the plate cylinder 40 is brought onto the sheets 1 to 1 at the same timing as the continuous sheets 1 to 24 are intermittently supplied, printing of a desired printing length can be achieved. After the tension member 92 has finished contacting the impression cylinder 94, the remaining 18
1III It, which rotates 0°, the tension supply of 24 to the sear 1 is stopped, and the printing plate 68 is also separated from the opposing impression cylinder 42 and similarly travels the remaining 180°, so printing is not performed during this time. Not done. Next, when the tensioning member 92 again comes into contact with the impression cylinder 94 and starts pulling the sheet 24, the printing plate 68 also synchronously comes into contact with the impression cylinder 42 (printing) - dead center. ), printing starts, and this cycle is repeated intermittently thereafter. For this reason, sea 1
- 11 printed surfaces of a predetermined length are sequentially formed adjacent to each other, and only tJ isted blank space is not generated.

Regarding this printing mode, an example in which a single rotary printing press is used will be briefly explained in detail in 8. Each mode (shown as an intermittent state over time from T1 to
8 designates each arc-shaped printing plate attached to this plate cylinder 40,
The arc length of the printing plate 68 is -4 method.

It is assumed that the plate cylinder is set to 174 of 40σ 11 revolutions per month” modulus πIJ. Further, reference numeral 24 indicates a continuous sheet 1- to be printed, and the planar state of the continuous sheet 1-24 is shown below in a positional correspondence. This continuous sea 1
- In the plan view of No. 24, the sections Δ, B, C, and so on, separated by vertical lines, are the areas planned for printing.
By printing in this area, printed matter A +
B+ r C+ +... In addition, in the case shown in the figure, the dimension I in the machine direction of the planned printing area is the actual printing length 1
However, in the case of full-page printing, the area size is equal to the printing length 1 ([, ≧j). Further, the printing length -Q substantially matches the arc length dimension (I/4πI) of the printing plate 68.

In addition, in FIG. 5, the arc length dimension l; l1 of the tension member 92
, ^; The flow direction of the printing constant area is set to be equal to ``Method I'', therefore, by rotating the cylinder 90 in the direction of the arrow, the tension member 92 and the impression cylinder 94 (FIG. 2) continuously When pressing the seal 1-24, the continuous sheet 2.1 is intermittently stretched and fed in the direction of the arrow by the length 1.

Then, during this continuous sheet 1 - intermittent supply, the plate cylinder 11 ( )
When the printing plate 68 attached to the continuous sheet 24'' reaches the continuous sheet 24''2〕1(
It would be a good idea to perform appropriate timing control to ensure this.

In other words, in FIG.
Pressing the sea 1-24 with the impression cylinder 94 and rubbing)
Start pulling in the direction of the arrow. At this point, the tip of the printing plate 68 attached to the plate cylinder 40 is placed at a predetermined printing contact position (,
However, it has not yet touched the sheet 24 (note that the arc distance between b and c is equal to the vertical margin l law d in each printed matter A r 8+ + C+ + . . . Become).

Then, with the rotation of P month 1■90 in the anti-chronological direction.

As shown in FIG. 5, the sheet 24 is pulled forward in the direction of the arrow, and at tJ'l, the leading edge of the printing plate 68 reaches the printing contact point Wr, and printing is started. Furthermore, through the processes shown in FIG. 5, the continuous sheet 1-24 is pulled and supplied by the arc length dimension (2) of the tensioning member 92, and as a result, a printed matter with a printing length of 1 is completed.

As shown in the fifth whistle, when the rear end e of the tension member 92 separates from the continuous sheet 24 and releases the contact, the sheet 1-2
4, the progress is stopped instantly. However, the plate cylinder 40 and I
'l Ilfm 9 (+ has the same diameter and rotates at the same speed) continues its rotation regardless of the stoppage of supply of the continuous sheet 24, and returns to the fifth Repeat the process shown in figure (fql).
1-24 is intermittently fed in the direction of the arrow by a predetermined distance 77<L, and the first plate cylinder 40 and impression cylinder 42 move the opposing printing section to the next printing area 13. Each time C, .
I get J. As described above, according to the printing apparatus according to the present invention, when printing on the continuous sheets 1 to 1, the continuous sheets are intermittently fed by a predetermined length of -1 while preventing the plate cylinder from constantly rotating at a constant speed, This sheet is intermittent (! Ii When feeding, the printing plate is brought to the sheet 1-1- and printing is performed.
It is possible to print at any printing length up to 1 in a continuous state without cutting 1 continuous sheet 1- (however, this arbitrary printing length depends on the length of the printing plate attached to the plate cylinder). (of course, it is limited to the circumferential dimension of the first plate), and the number of prints that are adjacent to each other is
This has many beneficial effects, such as eliminating unnecessary blank spaces between C1g and C1g. The present invention is suitably used for printing on a continuous riser in a corrugator line for producing one corrugated board, and thereafter, it can be used to print on a long film, cloth, web, etc. at a printing length of an arbitrary droplet. It is widely applicable to

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a double-sided corrugated board, Fig. 2 is a side view of the printing device according to the present invention without showing its schematic structure, and Fig. 3 is a plan view of the board printing section and the sheet 1 to tension supply section in Fig. 2. 4 is a schematic perspective view of the sheet tension supply flute, and FIG. 5 is a schematic explanatory diagram illustrating over time the printing process in each mode when printing is performed by the apparatus of the present invention. 16... Sea 1-storage section 18... Printing section 20.
... Sheet 1 - Tension supply section 40 ... Plate cylinder 42 ... Impression cylinder 68 ...
・Print plate

Claims (1)

[Claims] a sheet storage section for retaining a continuous sheet fed out from a take-up roll for a predetermined amount of time in a running state; a plate cylinder located downstream of the sheet storage section and equipped with a printing plate having a predetermined arc length dimension; one or more printing units consisting of impression cylinders disposed opposite to each other; and a printing unit located downstream of the printing unit that prints the continuous sheet by a predetermined length that is equal to or larger than the arc length of the printing plate. A continuous sheet printing device comprising a sheet 1 and a tension supply section that intermittently supplies the sheet to a printing section by tension.