JP3024976B2 - Multicolor offset printing press for flat plate and printing system using the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a flat plate multicolor offset printing machine used for performing multicolor offset printing on a non-bendable optical disk such as an optical disk, and a printing system using the same. About.

[Conventional technology]

2. Description of the Related Art Conventionally, it has been required to print on an optical disc such that the bend is insufficient or prohibited from being bent or print to the very edge of the optical disc. For example, a reflective optical disc cannot be printed and transported while nipping the optical disc. The label printing on the back side which was not the recording side was almost silk screen printing. In this case, the optical disk is positioned and fixed in a cassette, and the optical disk together with the cassette is set to a printing position of a silk screen printing machine, and the optical disk is placed in the cassette.
The color tone is printed, then the ink is dried, and the optical disk in the cassette is manually or automatically carried to the next printing unit for the second color to print the second color, and the above process is repeated to perform multicolor label printing.

However, with the above-mentioned conventional technology, it was not possible to perform fine and beautiful printing with a coarse pixel density.

 In addition, the equipment was large and required a large installation area.

[Problems to be solved by the invention]

The present invention has been made in view of the above circumstances, and has as its object to provide a multicolor offset printing press for a flat plate and a printing system using the same, which can directly and easily perform color offset printing on a non-bendable optical disc.

[Means for solving the problem]

In view of the above facts, in the invention according to the first aspect of the present invention, the circular concave type mounting portions on which the optical disk can be sucked on the bottom surface by applying the negative pressure are fixed at equal intervals along the circumference. A rotatable circular optical disc mounting printing platen, ink supply means provided with ink reservoirs divided for each ink, and a carriage reciprocating between the ink supply means and the optical disc mounting printing platen. One blanket cylinder which is supported by the carriage and transfers the ink to an optical disc placed on the placing section, a printing plate placing platen plate located on a movement locus of the blanket cylinder, and With a line perpendicular to the rotation center axis of the blanket cylinder and passing through the rotation center of the optical disk mounting printing platen as a reference line, an arc centered on the reference line with the same radius as the radius of the circle drawn by the mounting portion is described. As you draw, same as above A plurality of image portions on which a printing image is formed such that a straight line connecting the top and bottom of the image is directed to the center of the circular arc; And an inking roller for receiving the ink from the ink reservoir and transferring the ink to the image section; and driving means for intermittently driving the optical disc mounting printing platen to stop the optical disc corresponding to the image section. And a supply / discharge means for supplying / discharging the optical disk to / from the optical disk mounting printing platen.

The invention according to claim 2 is characterized in that the ink supply amount is controlled in the ink reservoir unit.

In the invention according to claim 3, the ink is an ultraviolet curing type, and is provided on the printing platen for mounting the optical disk, and is operated every time printing is completed, and an ultraviolet irradiation device that dries the ink printed on the optical disk. It is characterized by having.

According to the fourth aspect of the present invention, in addition to the multicolor offset printing press for a flat plate, a base is further applied to the optical disk before transferring ink to the optical disk mounted on the mounting portion of the printing surface plate for mounting the optical disk. It is characterized by having a silk screen printing machine.

[Action]

According to the first aspect of the present invention, the circular printing platen for mounting an optical disk is rotatable, and the printing platen for mounting an optical disk has a circular concave type mounting portion along the circumference. The optical discs can be attracted to the bottom surface of the mounting portion by applying a negative pressure.

On the other hand, the ink supply means is provided with an ink reservoir divided for each ink, and the carriage reciprocates between the ink supply means and the printing platen for mounting the optical disk.

One blanket cylinder is supported on this carriage,
The ink is transferred to the optical disc placed on the placing section.
A printing plate-mounting platen is arranged on the movement locus of the blanket cylinder.

Also, on the printing plate-mounting platen, the radius of the circle drawn by the mounting portion is defined as a reference line that is perpendicular to the rotation center axis of the blanket cylinder and that passes through the rotation center of the optical disk-mounting printing platen. A plurality of image parts having the same radius and arranged so as to draw an arc whose center is on the reference line, and on which an image for printing is formed such that a straight line connecting the top and bottom of the image is directed to the center of the arc. The parts are arranged at the same intervals.

Further, an ink applying roller is pivotally supported on the carriage, receives the ink from the ink reservoir, and transfers the ink to the image portion.

In this manner, the image for printing is made such that the radius of the circle drawn by the placing section and the image section is the same, the center is on the reference line, and the straight line connecting the top and bottom of the image is directed to the center of the arc. Is formed on the image part, so that ink is transferred at once from a plurality of image parts to a plurality of optical discs placed on the circumference of the optical disc mounting printing platen with only one blanket cylinder without printing displacement. be able to. Further, the optical disk is positioned on the printing platen for mounting the optical disk only by mounting the optical disk on the mounting portion of the circular concave type and fixing the optical disk by applying a negative pressure. Furthermore, by arranging a plurality of image sections in an arc shape, the installation area of the apparatus can be reduced.

On the other hand, the driving means drives the printing platen for mounting an optical disk intermittently to stop the optical disk corresponding to the image section. For this reason, when the printing platen for mounting an optical disk rotates, several optical disks on the printing surface plate for mounting an optical disk become printing positions and correspond to the image portion. By alternately repeating the rolling of the blanket cylinder and the rotation of the printing platen for mounting the optical disk, the optical disks on the printing surface plate for mounting the optical disk are sequentially printed with inks of different colors.

As described above, since the position of the optical disc and the image portion can be aligned only by intermittently driving the printing platen for mounting the optical disc, high-precision printing can be performed without an additional mechanism.

Further, the optical disk is supplied to and discharged from the printing platen for mounting the optical disk by the supply / discharge means. For this reason, the optical disk before printing is sequentially loaded on the printing platen for mounting an optical disk by the supply / discharge means, and after printing of a plurality of necessary colors, the optical disk is taken out from the printing surface plate for mounting the optical disk by the supply / discharge means. It is.

In the present invention, the supply / discharge means may be either manual or automatic, but is preferably automated for cost reduction. Various mechanisms can be adopted for the automation,
When it is necessary to avoid dirt and scratches on the optical disk, such as an optical disk, it is preferable to use a structure that does not rub on the transport path, as will be described later in an embodiment of the present invention.

According to the second aspect of the present invention, the ink supply amount is controlled in ink reservoir units.

For this reason, the supply amount of ink can be individually determined according to the pixel area of each color.

The ink supply means is required to simultaneously print different colors on different optical disks, so that the ink reservoir must be divided for each color. In general, the pixel area is different for each color. Therefore, it is preferable that the ink supply amount is determined in advance for each color so that the ink supply amount can be individually controlled for each ink reservoir.

According to the third aspect of the present invention, the ink is an ultraviolet-curable ink, and an ultraviolet-ray irradiator is provided on the printing platen for mounting the optical disk, and the ultraviolet-curable ink printed on the optical disk by operating each time printing is completed. Allow to dry.

As described above, since the ink can be dried immediately after printing, multicolor printing of the optical disc can be performed in a short time.

In addition, when printing over a relatively short time on an optical disk that does not absorb ink, it is necessary to dry the ink immediately after printing. In this case, an ultraviolet irradiation device is provided above the printing zone of the printing platen for mounting the optical disk.

Of course, not only UV-curable inks, but also heat-curable inks, electron beam-curable inks, active energy curable inks such as composite inks thereof, and curing devices corresponding thereto can be used arbitrarily.

The optical disk is designed to print yellow, red, indigo and black inks as standard, and a drying means for drying the ink is provided on the printing platen for mounting the optical disk every time printing with ink is completed.

A second drying unit for further completely drying the ink on the optical disk discharged from the printing platen for mounting the optical disk may be provided. The printing ink of each color is dried one after another after being printed on the optical disk, so that inks of different colors are not mixed.

According to the fourth aspect of the present invention, in addition to the multicolor offset printing press for a flat plate, a base is further applied to the optical disk before transferring ink to the optical disk mounted on the mounting portion of the printing surface plate for mounting the optical disk. It is characterized by having a silk screen printing machine.

For this reason, the color of the optical disk can be hidden, and the multicolor printing can be made clearer and more beautiful later.

The image portion for each color to be placed on the platen for printing plate placement may be one in which the image portion for each color is made into one plate with proper positioning. If color printing is desired, four printing plates may be prepared, each of which may be arranged on the same radius of rotation corresponding to the optical disk of the printing platen for mounting the optical disk, with the inclination thereof also being accurately adjusted. Alternatively, the image portions for two colors may be made into a single printed matter, and two printing plates may be prepared for four-color printing.

As described above, when a plurality of printing plates are used, it is convenient to provide a reference line for positioning the plates on the printing plate mounting plate surface in advance.

(Example of the invention)

1 and 2 show an offset printing press to which the present invention is applied.
10 is shown. In FIG. 1, the ink supply means, the platen, the carriage including the blanket cylinder and the inking roller, the frame on which these are mounted, and the driving units are each a conventional circular offset printing press (also referred to as a flatbed offset printing press). Since it is almost the same as above, it is simply shown. The offset printing press 10 is provided with transport lines 36, 36 for the optical disk 24.
The optical disk 24 is taken out from the end of the transport line 36 of A and 36B, and after performing predetermined label printing, the transport line 36
Return to B.

In this offset printing press 10, a turntable 14 is mounted on one side of a frame 12 as shown in FIG.
16 is supported vertically. The support shaft 16 is connected to a motor 18 as a driving means below the turntable 14 so as to rotate about a vertical axis (the direction of arrow D in FIGS. 1 and 2).

These turntables 14 have a plurality (12 in this embodiment) of circular recesses on the same radius of rotation (R) around the axis.
22 (see FIG. 4) are formed, and an optical disk 24 is inserted into each of them.

The turntable 14 is driven by a motor 18 so that each optical disc 24
Is intermittently every pitch P1, ie 1/12 rotation (30 degrees)
It is rotated every time.

The depth of the circular recess 22 is determined so that the printing surface of these optical disks 24 protrudes from the surface of the turntable 14 by a predetermined height.

A supply / discharge unit 26 is arranged adjacent to the turntable 14. The supply / discharge means 26 is a rotating shaft having a vertical axis.
An intermediate portion of the arm 32 is fixed to 28. At both ends of the arm 32, suction disks 34 shown in detail in FIG. 4 are mounted so that the optical disk 24 can be supplied to and discharged from the turntable 14.

In the supply / discharge means 26, a stack table 42 adjacent to the transport line 36 is provided so as to be able to reciprocate 180 ° around a vertical axis. This stack table 42 has a large number of sheets (for example, 100 sheets) on a stack pole 24B which is sent on the transport line 36
The stacked optical discs 24 are respectively housed on opposite sides of the vertical axis. In addition, stack pole 24
B protrudes from the support 24A.

Elevating arms 44 are arranged on the stack table 42 corresponding to the pair of stack pole mounting portions. When the optical discs 24 stacked on the stack pole 24B are mounted on the stack table 42, these elevating arms 44 rotate and enter the lower side of the lowermost optical disc 24 among the many optical discs 24, and the uppermost The optical disk is lifted to a height at which the optical disk can be sucked to the suction disk 34.

For this reason, when the optical disk 24 moves below the arm 32 due to the rotation of the stack table 42, the uppermost optical disk
24 corresponds to the suction cup 34. As described above, in a state where one stack pole 24B and the optical disc 24 are disposed below the suction disk 34, the other lifting arm 44 corresponds to the other stack pole 24B and the optical disc 24 that have entered the stack table 42. Then, similarly, the optical disk 24 is lifted and waits.

The stack table 42 is inverted when all the optical discs 24 are supplied to the turntable 14 by the lifting operation of the lifting arm 44, and sends the waiting optical discs 24 below the suction disk 34, and all the optical discs 24 are taken out. The stack pole 24B after returning is returned to the transport line 36A and the arrow B
Sent in the direction.

In this way, one optical disk 24 is always sent to the turntable 14 at every one pitch P1 of the turntable 14, thereby eliminating the difference in print tone between the optical disks 24.

It should be noted that a negative pressure from a negative pressure source (not shown) is supplied to the suction disk 34, and the application of a negative pressure to the suction disk 34 is controlled by an open / close valve (not shown).

The arm 32 is moved up and down by a cylinder 46. When the arm 32 rotates together with the cylinder 46 by a motor (not shown), the optical disc 24 is turned on the turntable.
It can be carried over the circular recess 22 at the 14 supply / discharge position S (FIG. 2), and can be inserted into the circular recess 22 by lowering the cylinder 46 again.

On the other hand, a suction plate 48 is also attached to the other end of the arm 32, and the supply of the negative pressure of the negative pressure source is controlled similarly to the suction plate 34. Accordingly, when the suction disk 34 supplies the optical disk 24 from the elevating arm 44 to the turntable 14, the suction disk 48 sucks and lifts the optical disk 24 on the turntable 14 and takes it out to the discharge line 52. ing.

The discharge line 52 is provided with a carrier 56 provided with a plurality of (seven in this embodiment) support recesses 54. The optical disc 24 inserted into the first support recess 54 by the suction cup 48 is supported. 1 by the transport bar 58 at the bottom of the recess 54.
It is sent downstream (direction of arrow E) for each pitch (P2).

The first operation of raising the optical disk 24 from the support recess 54 by raising the transport bar 58 from the origin (the direction of arrow F)
A second operation (arrow E direction) for moving the optical disk 24 to the downstream side of the discharge line 52 by one pitch (P2), and a third operation thereafter for lowering the optical disk 24 (arrow G direction).
And a fourth operation (in the direction of arrow H) of moving in the upstream direction to the origin of the first operation is repeatedly performed.

At the downstream end of the discharge line 52, a take-out arm 62 is disposed with its axis being vertical, sucks and lifts the optical disk 24 at the most downstream side on the discharge line 52, takes out the optical disk 24 from the discharge line 52, and takes out the transport line 36B. It is designed to be stacked on the inside stack pole 24B.

On the turntable 14, a screen printing machine 64 is arranged corresponding to a preliminary printing position T, which is a position where the optical disk 24 inserted into the circular recess 22 by the supply / discharge means 26 at the supply / discharge position S is rotated by 90 °. ing. The screen printer 64 is for applying a white base to the optical disc 24.

An ultraviolet dryer 66 is disposed at a position rotated by one pitch in the direction of arrow D of the turntable 14 relative to the screen printer 64 to dry a white base. This white base printing is solid printing, which is performed to conceal the color of the optical disc and to make multicolor printing more clear and beautiful later.

The turntable 14 is supplied to the optical disc 24 by
7 pitch rotation from the supply / discharge position S where the
The print stage U (U1, U2, U3, U4), which is the print position, is between the positions rotated by the pitch.

A printing plate 78 having four image portions 68 (68A to 68D) for each color is arranged on the platen plate corresponding to these printing stages U at the same height as the optical disk 24 on the turntable 14,
A blanket cylinder 72 having a horizontal axis transfers the image on the printing plate 78 onto each optical disk 24 on the printing stage U. For this purpose, the blanket cylinder 72 is connected to a driving means (not shown) so as to rotate and move in a direction approaching and separating from the printing stage (arrows J and K directions).

The carriage to which the blanket cylinder 72 is attached
On the opposite side of 73, an inking roller 74 is supported in a parallel axis state and moves together with the blanket cylinder 72, and after receiving ink from the divided ink reservoirs 76 of the ink supply means, comes to the printing plate 78 position. When the image section (68A
Transfer each color ink to ~ 68D).

The surface of the inking roller has different colors coaxially with a uniform thickness with a gap. The inking roller may be provided with a groove in accordance with the divided ink reservoir 76, but it does not matter if it is not. The same applies to the blanket cylinder 72.

The image portions 68A to 68D are each formed with a printing image for each color on the optical disc 24, the image portion 68A is for yellow ink, the image portion 68B is for red ink, the image portion 68C is for indigo ink,
Image part 68D is for black ink. The image portion of each color corresponds to the divided ink reservoir for each color.

The arrangement of the image sections 68A to 68D is the same as the arrangement of the four optical discs 24 on the printing stage. That is, these image portions 68A to 68D are arranged at the center positions on the rotation radius of the same rotation radius R as the optical disk 24 on the printing stage U, and the printing center lines (V1 to V4) are shifted from each other by 30 °. I have.

For this reason, the printing stages U1 to U4 are respectively parallel to the printing center lines V1 to V4, and the optical disk 24 on the turntable 14 is rotated at a pitch of 30 ° between the printing stages U1 to U4. ~ V4 is also shifted by 30 ゜, so optical disc
On the top 24, images of each color are printed in the same posture without color shift.

An ultraviolet irradiation device 82 is disposed on the printing stages U1 to U4 to dry the ink transferred from the blanket cylinder to the optical disk by the printing each time printing is performed.

The optical disk on which printing and drying of all four colors have been completed is taken out from the stack table 42, and then completely dried by the ultraviolet irradiation device 84 on the discharge line 52.

The circular recess 22 of the turntable 14 as shown in FIG.
A negative pressure pipe 86 communicated with a negative pressure source (not shown) is disposed in the optical disc 24 so that the optical disk 24 is surely attracted to the bottom surface of the circular concave portion 22.

Further, a push-up bar 88 projects from the bottom of the circular concave portion 22 from the bottom surface, and pushes up the optical disk 24 so that it can be easily sucked to the suction disks 34 and 48. The suction disks 34 and 48 are optical discs.
In this configuration, 24 printing portions (near the center opening) are sucked and lifted.

 Next, the operation of the present embodiment will be described.

After a recording operation is performed by a recording device (not shown), a large number of optical discs 24 are supported by a stack pole 24B, conveyed along a conveyance line 36 in the direction of arrow A, and sent onto a stack table 42. Here, when the lifting arm 44 lifts the optical disk 24, the stack table 42 rotates. Arm 32
The suction disk 34 sucks the uppermost optical disc 24, rotates clockwise in FIGS. 1 and 2, and arranges it at the supply / discharge position S of the turntable 14. Thereafter, when the arm 32 is lowered and the suction is released, the optical disk 24 is accommodated in the circular concave portion 22, and the optical disk 24 is moved into the circular concave portion 22 by applying a negative pressure to the negative pressure pipe 86.
It is securely placed inside.

When the turntable 14 is intermittently rotated in the direction of arrow D by the motor 18 and rotates a predetermined angle (90 °), the preliminary printing position T
Then, white printing is performed by the screen printer 64, and the white ink is dried by the next ultraviolet irradiation device 66.

Next, when the turntable 14 rotates a predetermined angle (210 °) from the supply / discharge position S, it reaches the printing stage U1. Here, when the turntable 14 is intermittently rotated, the blanket cylinder 72 is indicated by an arrow J.
The printing ink (yellow) applied on the image portion 68A is taken out and transferred onto the optical disc 24.
When the blanket cylinder 72 retracts in the direction of arrow K, the ultraviolet irradiation device 82 dries the ink.

Then, the turntable 14 rotates the optical disk 24 after the yellow ink printing to the U2 position. The blanket cylinder 72 moves again in the direction of the arrow J to take out the printing ink (red) on the image portion 68B and print on the printing slip optical disk 24 of the yellow ink on the printing stage U2.

At this time, the yellow ink of the image portion 68A is printed on the subsequent optical disk 24 brought to the printing stage U1. After that, drying, one pitch rotation drying, indigo ink printing, drying, one pitch rotation, black ink printing and drying are performed sequentially,
After all four colors have been printed, the optical disk 24 reaches the supply / discharge position S by rotating the turntable 14 by two pitches.

At this point, the arm 32 descends and the suction cup 48
Is lifted from the turntable 14 and transferred to the discharge line 52. On the discharge line 52, the optical disk is synchronized with one pitch rotation of the turntable 14 for each pitch.
24 is conveyed downstream (in the direction of arrow E), during which all the ink is completely dried again by the ultraviolet irradiation device 84.
After that, the take-out arm 62 ejects the optical disc 24
Take out from 52 and stack pole 24B in transport line 36B
Through the center hole.

The arm 32 takes the optical disk 24 after the printing ink is applied at the supply / discharge position S from the turntable 14 to the discharge line 52, and at the same time, the suction disk 34 supplies the next optical disk 24 from the stack pole 24B to the turntable 14. .

In this manner, a large number of optical discs 24 are sequentially sent to the turntable 14, and each optical disc 24 is successively rotated by the intermittent rotation of the turntable 14 for each pitch and the reciprocating motion of the blanket cylinder 72 and the inking roller 74. Since printing is performed using four colors of printing ink and dried, a large number of optical disks 24 can be printed in a short period of time.

In the above configuration, when a silk-screen printing machine for preliminary printing, an ultraviolet irradiation device, or the like interferes with the blanket cylinder 72 and other movable parts, it is retracted, raised, and retracted.

〔The invention's effect〕

Since the present invention is configured as described above, according to the first aspect of the present invention, ink is simultaneously applied from a plurality of image units to a plurality of optical disks mounted on the mounting unit with only one blanket cylinder without printing deviation. Can be transcribed. Further, the optical disk is positioned on the printing platen for mounting the optical disk only by mounting the optical disk on the mounting portion of the circular concave type and fixing the optical disk by applying a negative pressure. Furthermore, by arranging a plurality of image sections in an arc shape, the installation area of the apparatus can be reduced. According to the second aspect of the present invention, the ink supply amount can be individually determined according to the pixel area of each color.
According to the third aspect of the invention, the ink can be dried immediately after printing, and the optical disc can be multicolor printed in a short time. According to the fourth aspect of the present invention, it is possible to conceal the color of the optical disk and to make multicolor printing more clear and beautiful later.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a printing system using a multicolor offset printing press for a flat plate to which the present invention is applied. FIG. 2 is a plan view of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a sectional view taken along line IV-IV of FIG. [Description of Signs] 10: Offset printing machine (multicolor offset printing machine for flat plate), 14: Turntable (printing surface plate for mounting optical disc), 18: Motor (driving means), 24: Optical disc, 26 ... Supply / discharge means, 32 ... Arm (supply / discharge means), 34 ... Suction board (supply / discharge means), 38 ... Suction board (supply / discharge means), 64 ... Screen printing machine (silk screen printing machine) ), 68 image part, 72 rubber cylinder, 73 carriage, 74 inking roller, 76 ink reservoir (ink supply means), 78 printing plate (plate setting plate) Panel), 82 ... UV irradiation device, 84 ... UV irradiation device.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazu Shimizu 3-19-19 Himonya, Meguro-ku, Tokyo (56) References JP-A-63-218358 (JP, A) JP-A-1-190454 (JP, A) ) Real opening 63-33939 (JP, U)

Claims (4)

(57) [Claims] 1. A rotatable circular optical disk mounting printing platen having a circular concave type mounting portion on which an optical disk can be adsorbed on the bottom surface by applying a negative pressure and fixed at equal intervals along the circumference. An ink supply unit provided with an ink reservoir divided for each ink; a carriage reciprocating between the ink supply unit and a printing platen for mounting an optical disk; and One blanket cylinder for transferring the ink to the loaded optical disc; a platen for printing plate placement positioned on the movement locus of the blanket cylinder; and the optical disc placement orthogonal to the rotation center axis of the blanket cylinder. The line passing through the center of rotation of the printing platen as a reference line, so as to draw an arc centered on the reference line with the same radius as the radius of the circle drawn by the mounting portion, at the same interval as the mounting portion Placed on the platen for printing plate A plurality of image portions on which images for printing are formed such that a straight line connecting the top and bottom of the image is directed to the center of the arc; and receiving the ink from the ink reservoir, being pivotally supported by the carriage, and receiving the ink from the ink reservoir. An inking roller for transferring ink; a drive unit for intermittently driving the printing platen for mounting the optical disk to stop the optical disk in correspondence with the image portion; and supplying the optical disk to the printing surface plate for mounting the optical disk. A multicolor offset printing press for flat plates, comprising: a supply / discharge unit for discharging. 2. The multi-color offset printing press for a flat plate according to claim 1, wherein an ink supply amount is controlled in each ink reservoir unit. 3. The apparatus according to claim 1, wherein said ink is of an ultraviolet curing type, and has an ultraviolet irradiation device which is provided on said printing platen for mounting said optical disk and is operated each time printing is completed to dry said ink printed on said optical disk. The multi-color offset printing press for flat plates according to claim 1 or 2, wherein: 4. A silk screen printing machine for applying a base to an optical disk before transferring ink to an optical disk mounted on a mounting portion of a printing platen for mounting an optical disk. A printing system using the multicolor offset printing press for flat plate described in 1 above.