JP3147883B2 - Optical disk printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a printing method that can not bend the optical disk.

[0002]

2. Description of the Related Art Hitherto, it has been required to print on an optical disk such that bending is insufficient or prohibited, or to print to the very edge of the optical disk, and it is not possible to print and transport while holding the optical disk. For example, label printing on the back side of the reflection type optical disk which is not the recording side is almost silk screen printing. In this case, the optical disk is positioned and fixed in a cassette, the optical disk is set in a printing position of a silk screen printing machine together with the cassette, and the first color is printed. Then, the ink is dried and the cassette is manually or automatically inserted into the next second color printing unit. The optical disk is carried and the second color is printed, and the above process is repeated to perform multicolor label printing.

[0003] However, in the above-mentioned conventional technique, the pixel density is coarse, and fine and beautiful printing cannot be performed.

[0004] In addition, the equipment is large and requires a large installation area.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention In view of the above, it is an object to obtain a printing method of an optical disk can be carried out directly and easily color offset printing to bend impossible disc.

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, according to the present invention, first, circular recesses arranged at regular intervals on a rotatable circular optical disc mounting printing platen are provided. A negative pressure is applied to the bottom surface of the mounting portion of the mold, and the optical disk on which information is written is sucked and fixed.

Next, an inking roller reciprocating between the ink reservoir and the printing platen for mounting the optical disk receives each ultraviolet curable ink at a time from the ink reservoir divided for each ink. The radius of the circle drawn by the mounting portion is defined as a reference line that is located on the movement locus of the inking roller and that is perpendicular to the rotation center axis of the inking roller and that passes through the rotation center of the printing platen for mounting the optical disk. Arranged at the same interval as the mounting part so as to draw an arc whose center is on the reference line with the same radius as the printing image formed so that the straight line connecting the top and bottom of the image goes to the center of the arc An inking roller transfers ink to the image area at a time.

Then, one blanket cylinder that moves together with the inking roller receives each ink on the image portion at a time and transfers it to a plurality of optical disks at a time.

Each ink on the image area is transferred to an optical disc.
After irradiating the optical disc with ultraviolet light, the ink is completely
To dry.

According to such a process, ink is transferred at once from a plurality of image portions arranged in an arc shape to a plurality of optical discs placed on a mounting portion by using only one blanket cylinder without printing displacement. Can be. Further, the optical disk is positioned on the printing platen for mounting the optical disk only by placing the optical disk on the mounting portion of the circular concave portion and fixing the optical disk by applying a negative pressure. Further, it is possible to quickly print on an optical disk even in a narrow place. In addition, the inking roller
One rubber cylinder that moves with
After all the data has been transferred to the optical disc, the optical disc is irradiated with ultraviolet light.
To dry the ink completely,
Multicolor printing is also possible.

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

For this reason, ink can be individually supplied according to the pixel area of each color, thereby reducing waste.

[0013]

[0014]

According to the third aspect of the present invention, the silk screen
UV-curable ink on optical disc
And apply UV light to dry or completely dry the substrate.
And then, on the base under the process of claim 1 or 2
Turn off UV-curable ink that is different from the one used on the ground
Transfer by set printing.

[0016] Therefore, the color of the optical disk can be concealed and multicolor printing can be made clearer and more beautiful later.

[0017]

The DESCRIPTION OF THE PREFERRED EMBODIMENTS first and second figure is shown offset printer 10 to which the present invention is applied. In the same drawing, the ink supply hand throw, the platen plate, the carriage including the blanket cylinder and the inking roller, the frame on which these are mounted,
Since each drive unit and the like are almost the same as a conventional circular pressure offset printing press (also referred to as a flatbed offset printing press), they are simply shown. This offset printing press 10 is used for the optical disc 2
The optical disk 24 is taken out from the end of the transport line 36 among the four transport lines 36, 36A, and 36B, and is returned to the transport line 36B after performing predetermined label printing.

Next, the step of mounting the optical disk on the printing platen for mounting the optical disk will be described.

In this offset printing press 10, a turntable 14 is supported on one side of a frame 12 with its support shaft 16 vertical as shown in FIG. 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 of rotations (12 in this embodiment) on the same radius of rotation (R) around the axis.
Are formed, and the optical disc 24 is inserted into each of the circular recesses 22 (see FIG. 4).

The turntable 14 is configured so that each optical disk 24 is intermittently rotated by a motor 18 at every one pitch P1, ie, every 1/12 rotation (30 degrees).

As described above, the turntable 14 is intermittently driven by the driving means, and the optical disk 24 can be stopped in association with the image section 68. For this reason,
When the turntable 14 rotates, several optical discs 24 on the turntable 14 become printing positions, and the image portion 68
And corresponding.

Also, by alternately repeating the rolling of the blanket cylinder 72 and the rotation of the turntable 14, the optical disk 14 on the turntable 14 is sequentially printed with inks of different colors.

With such a configuration, the optical disk 24 and the image section 6 can be simply driven by intermittently driving the turntable 14.
Since the position of the position 8 can be adjusted, high-precision printing can be performed without an additional mechanism.

On the other hand, the depth of the circular concave portion 22 is determined such that the printing surface of these optical disks 24 protrudes from the surface of the turntable 14 by a predetermined height.

A supply / discharge means 26 is arranged adjacent to the turntable 14, and the optical disc 24 is
Supply and discharge to 4. For this reason, the optical disk 24 before printing is sequentially loaded on the turntable 14 by the supply / discharge means 26, and after printing of a plurality of necessary colors is performed,
4 is taken out of the turntable 14 by the supply / discharge means 26.

In the supply / discharge means 26, an intermediate portion of an arm 32 is fixed to a rotating shaft 28 having a vertical axis. At both ends of the arm 32, a suction cup 3 shown in detail in FIG.
The optical disk 24 can be supplied to and ejected from the turntable 14.

The supply / discharge means 26 is provided with a stack table 42 adjacent to the transport line 36 so as to be able to reciprocate 180 ° around a vertical axis. The stack table 42 holds the stack poles 24 sent on the transport line 36.
A plurality of (for example, 100) optical disks 24 stacked on B are housed on opposite sides of the vertical axis. The stack pole 24B protrudes from the support 24A.

On the stack table 42, lift arms 44 are respectively arranged corresponding to a pair of stack pole mounting portions. These lifting arms 44 are connected to the stack pole 2
When the optical discs 24 stacked on the 4B are mounted on the stack table 42, the optical discs 24 turn and enter the lower side of the lowermost optical disc 24 among the many optical discs 24,
The uppermost optical disk is lifted to a height at which the optical disk can be sucked to the suction disk 34.

Therefore, 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 disk 34. Thus, one of the stack poles 24B and the optical disc 24
Is placed below the suction cup 34, and the other stack pole 24B
The other lifting arm 44 corresponds to the optical disk 24, and similarly lifts the optical disk 24 and waits.

When all the optical disks 24 are supplied to the turntable 14 by the lifting operation of the lifting arm 44, the stack table 42 is inverted, and the standby optical disk 24 is sent below the suction disk 34, and all the optical disks 24 are fed. The stack pole 24B after having been taken out is returned to the transport line 36A and sent in the direction of arrow B.

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

The suction disk 34 is supplied with a negative pressure from a negative pressure source (not shown), 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 is rotated together with the cylinder 46 by a motor (not shown), the optical disk 24 is at the supply / discharge position S of the turntable 14 (FIG. 2). It can be carried over the circular concave portion 22 and inserted into the circular concave portion 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. Therefore, when the suction disk 34 supplies the optical disk 24 from the lifting arm 44 to the turntable 14, the suction disk 48 turns the turntable 1.
The optical disk 24 on the disk 4 is sucked and lifted, and taken out to the discharge line 52.

The discharge line 52 is provided with a transfer table 56 provided with a plurality of (seven in this embodiment) support recesses 54.
The optical disk 24 inserted therein is sent out downstream (in the direction of arrow E) at intervals of one pitch (P2) by a transport bar 58 below the support recess 54.

The transport bar 58 rises from the origin and lifts the optical disk 24 from the inside of the support recess 54 (in the direction of arrow F), and moves the optical disk 24 one pitch (P2) downstream of the discharge line 52. A second operation (in the direction of arrow E), and then a third operation of lowering the optical disc 24
(In the direction of arrow G) and the fourth operation (in the direction of arrow H) of moving to the origin of the first operation in the upstream direction are repeatedly performed.

At the downstream end of the discharge line 52, a take-out arm 62 is disposed with its axis being vertical.
The optical disk 24 on the uppermost downstream side is sucked and lifted, taken out from the discharge line 52, and stacked on the stack pole 24B in the transport line 36B.

The supply / discharge means 26 may be either manual or automatic, but is preferably automated for cost reduction. Various mechanisms can be adopted for the automation, but when it is necessary to absolutely avoid contamination and scratching of the optical disc 24, a structure that does not rub on the transport path is preferable.

Next, a process in which the inking roller transfers each ink received from the ink reservoir to a plurality of image portions at once will be described.

On the turntable 14, a preliminary printing position T at which 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 °.
The screen printing machine 64 is arranged corresponding to.

Here, the screen printing machine 64 applies a white base to the optical disk 24 and then dry or completely dry the optical disk 24.
Let

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 underprinting is solid printing, which conceals the color of the optical disk, and makes multicolor printing more clear and beautiful later.

The printing stage U (U1, U2, U2) is a printing position between the state in which the turntable 14 is rotated by 7 pitches and the state in which the turntable 14 is rotated by 10 pitches from the supply / discharge position S on which the optical disk 24 is mounted. U3, U4).

A printing plate 78 having four image portions 68 (68A to 68D) for each color is placed 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 7 arranged and having a horizontal axis
2 transfers the images on the printing plate 78 onto the respective optical disks 24 on the printing stage U.
For this reason, the blanket cylinder 72 is connected to a driving means (not shown) so as to rotate in the direction of approaching and separating from the printing stage (the directions of arrows J and K).

On the opposite side of the carriage 73 to which the blanket cylinder 72 is attached, an inking roller 74 is supported in a parallel shaft state and moves together with the blanket cylinder 72, and the ink supply means for each divided color is used. After receiving the ink from the ink reservoir 76, when it comes to the printing plate 78 position, each color ink is transferred to the image portions (68A to 68D) at once while rotating in contact with the plate.

Here, the ink reservoir 76 must be divided for each color because it is necessary to simultaneously print different colors on different optical disks 24. In general, the pixel area differs 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.

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

It should be noted that different colors are coaxially formed on the surface of the inking roller with a uniform film thickness with a gap therebetween. The inking roller is provided with a divided ink reservoir 76.
However, there is no particular problem if the grooves are not provided. The same applies to the blanket cylinder 72.

Each of the image portions 68A to 68D has a print image of a different color on the optical disk 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, and the image portion 68D is for black ink. The image portion of each color corresponds to the divided ink reservoir for each color.

Next, a process in which the blanket cylinder receives each ink on the image portion at one time and transfers it to a plurality of optical disks at once will be described.

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 68A-6
8D, the center position is arranged on the same rotation radius R as the optical disk 24 on the printing stage U, and the printing center lines (V1 to V4) are also shifted by 30 ° from each other.

Therefore, the printing stages U1 to U4 are parallel to the printing center lines V1 to V4, respectively, and the optical disk 24 on the turntable 14 is mounted on the printing stages U1 to U4.
Between the printing centers V1 to V4
Are shifted by 30 °, so that images of each color are printed on the optical disk 24 in the same posture without color shift.

By such a process, one blanket cylinder 7 is provided.
Ink can be transferred at once from a plurality of image portions 68 arranged in an arc shape to a plurality of optical disks 24 placed on the mounting portion 68 by using only two, so that printing displacement does not occur and a narrow space can be quickly produced. But it can be printed on an optical disc.

Next, a process of irradiating the optical disk onto which the ink has been transferred with the ultraviolet irradiation device with ultraviolet light to dry the ink will be described.

An ultraviolet irradiation device 82 is disposed on the printing stages U1 to U4 for drying 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.

In the case where overprinting is performed on the optical disk 24 which does not absorb ink in a relatively short period of time, it is necessary to dry the ink immediately after printing. Preferably, the ink is an ink. In that case, an ultraviolet irradiation device 84 is provided above the print zone of the turntable 14.

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

The optical disk 24 is designed to print yellow, red, indigo and black inks as standard.
Above is provided a drying means for drying the ink every time printing with the ink is completed.

A second drying means for further drying the ink on the optical disk 24 discharged from the turntable 14 may be provided. The printing ink of each color is dried one after another after being printed on the optical disc 24, so that inks of different colors are not mixed.

The image portion 68 for each color placed on the printing plate 78 may be one in which the image portion for each color is correctly positioned and made into one plate. When printing is to be performed, four printing plates may be prepared, each of which may be arranged on the same radius of rotation corresponding to the optical disk 24 of the turntable 14 so that the inclination thereof is also accurately adjusted, or two printing plates may be used. It is also possible to make an image portion for one print on one printed material and prepare two printing plates 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 printing plates on the printing plate mounting plate surface in advance.

Next, the step of removing the optical disk to which each ink has been transferred from the printing platen for mounting the optical disk will be described.

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

A push-up rod 88 projects from the bottom of the circular concave portion 22 from the bottom surface to push 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 configured to suction and lift a portion to be printed (near the center opening) of the optical disk 24.

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 disks 24 are supported by a stack pole 24B, are transported along a transport line 36 in the direction of arrow A, and are sent onto a stack table 42. Here the lifting arm 4
4 lifts the optical disk 24, and the stack table 42 rotates. The suction disk 34 of the arm 32 sucks the uppermost optical disk 24 and rotates clockwise in FIGS. 1 and 2 to position the turntable 14 at the supply / discharge position S. Thereafter, when the arm 32 is lowered and the suction is released, the optical disk 24 is released.
Is accommodated in the circular concave portion 22, and the optical disc 24 is securely arranged in the circular concave portion 22 by applying a negative pressure to the negative pressure pipe 86.

When the turntable 14 is intermittently rotated in the direction of arrow D by the motor 18 and rotates by a predetermined angle (90 °), it reaches the preliminary printing position T, where white printing is performed by the screen printing machine 64 and the next ultraviolet irradiation device. At 66, the white ink is dried. Therefore, the color of the optical disc 24
And make multi-color printing more vivid and beautiful
be able to.

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 moves in the direction of the arrow J to take out the printing ink (yellow) applied on the image portion 68A and transfer it to the optical disk 24. When the blanket cylinder 72 retracts in the direction of arrow K, the ultraviolet irradiation device 82 dries this ink.

Then, the turntable 14 rotates the optical disk 24 after printing the yellow ink 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. Thereafter, drying, one-pitch rotation drying, indigo ink printing, drying, one-pitch rotation, black ink printing, and drying are performed. After all four colors have been printed, the optical disk 24 is supplied by the two-pitch rotation of the turntable 14. It reaches the discharge position S.

At this point, the arm 32 moves down and the suction
Lifts the vicinity of the center of the optical disc 24 from the turntable 14 and delivers it to the discharge line 52. On the discharge line 52, the optical disc 24 is moved downstream (in the direction of arrow E) in synchronization with one pitch rotation of the turntable 14 for each pitch.
During this time, all the inks are completely dried again by the ultraviolet irradiation device 84. Then take-out arm 62
Takes out the optical disk 24 from the discharge line 52 and stacks it through the center hole on the stack pole 24B in the transport line 36B.

At the same time as the arm 32 takes out the optical disk 24 to which the printing ink has been applied at the supply / discharge position S from the turntable 14 to the discharge line 52, the suction disk 34 moves the next optical disk 24 from the stack pole 24B to the turntable 14. And supply.

In this manner, a large number of optical disks 24 are sequentially sent to the turntable 14, and each optical disk 24 is repeatedly rotated by the intermittent rotation of the turntable 14 at every pitch and the reciprocating movement of the blanket cylinder 72 and the inking roller 74. Are successively printed with four colors of printing ink and dried, so that a large number of optical disks 24 can be printed in a short period of time.

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

In the present invention, the supply of the optical disk 24 to a predetermined position of the printing plate 78 or the discharge of the optical disk 24 after the printing and drying may be performed manually or automatically, but the cost is reduced. Therefore, it is preferable to automate. Various mechanisms can be adopted for the automation, but when it is necessary to absolutely avoid dirt and scratches on the optical disk, a structure that does not rub on the transport line 36 is preferable.

[0079]

Further, a second drying means for further drying the ink on the optical disk 24 discharged from the turntable 14 may be provided.

[0081]

According to the present invention having the above-mentioned construction, according to the first aspect of the present invention, the printing section is not shifted, and the mounting section is formed from a plurality of image sections arranged in an arc by only one blanket cylinder. Ink can be transferred to a plurality of optical discs placed on the same at once. Further, the optical disk is positioned on the printing platen for mounting the optical disk only by placing the optical disk on the mounting portion of the circular concave portion and fixing the optical disk by applying a negative pressure. Further, it is possible to quickly print on an optical disk even in a narrow place. In addition, multicolor printing of optical discs can be performed in a short time.
Can be According to the second aspect of the present invention, the ink can be individually supplied according to the pixel area of each color, so that there is little waste. According to the third aspect of the present invention, it is possible to conceal the color of the optical disc and to make multicolor printing more clear and beautiful.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an offset printing press used in the present embodiment.

FIG. 2 is a plan view showing an offset printing press used in the present embodiment.

FIG. 3 is a sectional view taken along line III-III of FIG . 1 ;

FIG. 4 is a sectional view taken along line IV-IV of FIG . 2 ;

[Explanation of symbols]

 Reference Signs List 10 offset printing machine 14 turntable (printing surface plate for mounting optical disc) 24 optical disc 64 screen printing machine (silk screen printing machine) 68 image portion 72 blanket cylinder 73 inking roller 76 ink reservoir 82 ultraviolet irradiation device 84 ultraviolet irradiation device

Claims (3)

(57) [Claims] 1. A bottom surface of a circular concave type mounting portion arranged at equal intervals on a rotatable circular optical disk mounting printing surface plate.
A process of applying a negative pressure to adsorb and fix the optical disk on which information is written, and an inking roller which reciprocates between the ink reservoir and the printing platen for placing the optical disk is moved from the ink reservoir divided for each ink. After receiving each ultraviolet curable ink at a time, a line located on the movement locus of the inking roller, perpendicular to the rotation center axis of the inking roller, and passing through the rotation center of the optical disc mounting printing platen is As a reference line, a straight line connecting the top and bottom of the image is arranged at the same interval as the placement section so as to draw an arc centered on the reference line with the same radius as the radius of the circle drawn by the placement section. A step in which the inking roller transfers ink at a time to a plurality of image portions where an image for printing is formed so as to head toward the center of one of the rubber cylinders that moves together with the inking roller,
Transferring the ink on the image area to an optical disk, and irradiating the optical disk with ultraviolet light to completely dry the ink
A method for printing an optical disk , comprising a step of causing the optical disk to print. 2. The method for printing an optical disk according to claim 1, further comprising a step of controlling an ink supply amount in units of the ink reservoir. 3. A purple screen is applied to an optical disk by silk screen printing.
Apply a base of external curing type ink and irradiate with ultraviolet light before
Claim 1 or claim 2 after drying or completely drying the substrate.
2. The method according to any one of 2 above, wherein
UV curable ink different from the
Optical printing method according to claim 1 or 2, characterized in that to transfer.