JPS634218Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Technical field This invention is a printing machine for a plate-making roll. Specifically, the plate-making roll is supported horizontally at both ends by a pair of spindles, and the original film is wound on top of the plate-making roll. Ultraviolet rays are used in a printing machine for plate-making rolls, which has a configuration in which the original film is held down by a pair of push rolls, and the ultraviolet rays are irradiated from above between the pair of push rolls through an irradiation hood by an ultraviolet irradiation device to print on the plate-making roll. This invention relates to an irradiation range limiting mechanism of an irradiation device.

(2) Background technology Conventional plate-making roll printing machines have
There is one shown in the figure. This printing machine is of the NC multi-sided printing type, and to explain its construction, reference numeral R denotes a plate-making roll, which is supported horizontally at both ends by a driving side spindle 1 and a non-driving side spindle 2. The drive spindle 1 is driven by a motor 3 whose rotation amount is controlled by a computer via a gear reducer 4 and a worm-worm gear mechanism 5. The non-drive side spindle 2 is rotatably attached to a tailstock 7 mounted on a bed 6 and is movable in the axial direction by an air cylinder device 8. The threaded shaft 10 of the tailstock 7 is rotated by turning the handle 9.
In addition, a screw block 11 fixed to the tailstock 7 is threadedly engaged with a screw shaft 10, so that it can be freely adjusted for movement on the bed 6. A movable table 12 is placed on the bed 6.
A screw shaft 14 provided in the bed 6 is rotated by a motor 13 whose rotation amount is controlled by a computer, and a screw block 15 fixed to the movable table 12 is threadedly engaged with the screw shaft 14. This makes it possible to move freely on the bed 6. A pair of brackets 16, 16 are erected at both ends of the movable table 12 in the spindle direction, and a pair of arms supporting a pair of presser rolls 17, 17 and a film winding drum 18 at both ends are provided at the upper ends of the brackets 16, 16, respectively. 19, 19 are pivotally mounted. A balance weight 20 is attached to the arms 19, 19 on the opposite side of the presser rolls 17, 17 with respect to the fulcrum, so that the moment action of the arms 19, 19 can be suppressed to a small level, and the air cylinder devices 21, 21 are driven to extend. By doing so, the arms 19, 1 are connected via the gears 22, 22, 23, 23.
9 is configured to cover the upper side of the plate making roll R, and at this time, the presser rolls 17, 17 are configured to ride on the plate making roll R. The original film F is configured such that one end can be held in the film winding drum 18, and the other end can be held in the brackets 16, 16.
The film winding drum 18 is configured so that it can be held by a film fixing piece 24 which is pivotally supported at both ends thereof, and the film winding drum 18 is configured so that the original film F can be tensioned by a torque motor 25. The two presser rolls 17, 17 are attached at a predetermined distance to support frames 26, 26 which are pivotally connected to each arm 19, 19, and the support frames 26, 26 can be reset by two springs 27, 27, respectively. Therefore, the presser rolls 17, 17 are configured to rest on the plate-making roll R even if the plate-making roll R is different in size. Presser roll 1 is attached to arms 19, 19.
Ultraviolet irradiation device 2 is placed on the upper side corresponding to between 7 and 17.
8 is provided, and an irradiation hood 29 is provided between the ultraviolet irradiation device 28 and the presser rolls 17, 17 in the vertical direction.
is provided from the device 28, and the irradiation hood 29 faces between the presser rolls 17, 17. In addition, code 3
0 is the base.

Next, to explain the operation, turn the handle 9 to set the tailstock 7 in a predetermined position, set the air cylinder device 8 in the retracted state, move the spindle 2 to the left, and then set the air cylinder devices 21, 21 in the retracted state. Lift up the arms 19, 19, and in this state, hoist or lift the plate-making roll R horizontally and on one axis with the spindles 1, 2, and then extend or drive the air cylinder device 8 to lift the plate-making roll R. By fitting the conical holes at both ends with the tips of the spindles 1 and 2, the plate-making roll R is supported at both ends by the spindles 1 and 2.

On the other hand, with the arms 19, 19 lifted, one end of the original film F is held in the film winding drum 18, and the other end is held in the fixing piece 24, and then the original film F is moved by the torque motor 25.
is tensioned and the motor 13 is driven to move the movable table 12 to a printing start position corresponding to the right end of the plate making roll R supported at both ends by the spindles 1 and 2. A light shielding mask is attached to the irradiation hood 29 in order to narrow down the ultraviolet irradiation range according to the size of the original film F. Thereafter, the air cylinder devices 21, 21 are driven to retire and the arms 19, 19 are moved downward, thereby bringing the document film F into contact with the plate-making roll R over the necessary area, and further pressing the presser rolls 17, 17. Place it on the plate making roll R.
The computer is also made to store the diameter and length of the plate-making roll R and the size and arrangement of the original. With the above steps, the preparation for printing is completed.

Then, when the computer is activated, the motor 3 is driven, the plate-making roll R is rotated by a slight angle and stopped, and the printing start position in the circumferential direction is determined.After that, the ultraviolet irradiation device 28 starts irradiation and the motor 3 is turned on again. The printing roll R is driven to print one circumference of the printing roll R, and when the printing is completed, the irradiation is stopped, the motor 3 is moved in reverse, and the printing roll R is returned to its original position. Depending on the original film, one round of printing is performed by multi-sided printing. Next, arm 1
9 and 19 are lifted up, and the movable table 12 is moved to the left by a predetermined distance by driving the motor 13 and stopped, and the arms 19 and 19 are lowered again to perform the above-described printing. It will be held in

(3) Problems to be solved in the background art Now, it is assumed that the mount width of the original film F is, for example, 60 cm, and a document portion of, for example, 30 cm is projected approximately in the center of the width direction, and the opening length of the irradiation hood 29 is, for example, If it is 50 cm, the irradiated light will leak beyond 60 cm, so add 10 cm at each end of the original film in the width direction.
Light shielding is achieved by attaching thin ears of a light-shielding mask with a width of about 100 mm, or by pasting black tape or black cardboard to the irradiation hood 29 below the ultraviolet irradiation device 28 as described above. However, the method of attaching thin light-shielding masks of about 10 cm width to each end of the original film in the width direction to block light is troublesome and increases the thickness even if the overlapping parts of the light-shielding mask and the original film are pasted without wrinkles. So presser roll 1
Even if the original film F is suppressed in steps 7 and 17, there is a drawback that the printing accuracy is lowered.

Furthermore, the method of attaching black tape or black cardboard to the irradiation hood 29 to block light is very troublesome and requires changing the size of the light shielding mask each time depending on the size of the document portion of the document film F. If the original film F is incomplete, one end of the light-shielding mask peels off during printing, and the irradiated light leaks to the outside of the original film F, resulting in a failure in printing.

(4) Disclosure of the invention This invention was devised in view of the above-mentioned points.A reel-shaped mask is placed at both ends of the irradiation hood, and the opening of the irradiation hood is closed by guiding this mask to the underside of the irradiation hood. Both ends of the section can be freely masked as desired, and a pair of mask pieces is slidably hooked between the presser rolls and this mask piece can be connected to the reel-shaped mask, so that the roll axis direction between the presser rolls can be adjusted. Both ends can be masked as desired, making it easy to adjust the masking range according to the size and position of the original portion of the original film F, and even if the original portion is provided over the full width of the mount of the original film F. The irradiation range of the ultraviolet irradiation device in the printing machine for plate-making rolls has been improved so that the irradiation light can only be irradiated to the full width of the document mount, and it does not interfere with the function of turning the ultraviolet irradiation device sideways for maintenance, inspection, etc. It provides a mechanism.

(5) Best Mode for Carrying Out the Invention Figures 4 and 5 are a plan view and a side view of an embodiment of the irradiation range limiting mechanism of the ultraviolet irradiation device in the printing machine of this invention.

(5-1) Configuration The printing machine according to this invention is configured such that a plate-making roll R is horizontally supported at both ends and rotated by a pair of spindles 1 and 2, and a pair of arms 1
9 and 19 are plate-making rolls R using an air cylinder device.
The arms 19, 19 are provided with a pair of presser rolls 17, 17 that can be brought into rolling contact with the plate-making roll.
, an ultraviolet irradiation device 28 provided above the pair of presser rolls 17, 17, and a film winding drum 1 driven by a torque motor.
8, the ultraviolet irradiation device 28 is equipped with an irradiation hood 29, one end of the original film F is fixed to the film winding drum 18, and the other end is fixed on the opposite side of the film winding drum 18 with respect to the plate making roll R. Hold the paper and press the original film F with the presser rolls 17, 17.
It is configured so that it can be brought into close contact with the plate-making roll R.

The irradiation range limiting mechanism of the ultraviolet irradiation device of this invention is provided in the irradiation hood 29 in the printing machine configured as described above.
Reel-shaped strip masks 31, 31 made of magnetic metal plates are attached to both ends of the strip masks 31, 3.
1 formed on the edge of the opening of the irradiation hood 29
A magnetic piece 32 made of a metal plate is attached to the tip of each mask guided to 9a, and a magnet 33 that attracts the strip mask 31 is attached to the lower side of the attachment point where the strip mask 31 is stored in a reel shape. 29, a pair of mask pieces 35, each having an arc-shaped concave surface on both sides thereof, the pair of concave surfaces being loosely held between a pair of presser rolls 17, and a magnet piece 34 embedded in the upper surface;
35 is attached, and each magnet piece 34 and the corresponding magnetic piece 32 at the tip of the strip mask 31 are attracted to each other. Band mask 31
is configured to be restored into a reel shape, and is housed in a casing 36, with an inner winding end 31a fixed to a fixed shaft 37 provided from the casing 36.
Magnet 33 and mask extraction port 3 of casing 36
3a coincides with the plane. 35 mask frames each
It is preferable that each of the presser rolls 17, 17 is provided with an adjustment rod 38.
It passes through the support frame 26 that supports the shaft portion of the arm 19, and further passes through the arm 19, so that it can be manually moved in the axial direction outside the arm 19. The axial movement of the adjustment rod 38 may be automatic. To do this, the adjustment rod 38 and the mask piece 35 are not fixed integrally, but the adjustment rod 38 is rotatably attached, and the adjustment rod 38 is attached rotatably.
8 may be provided with a rack or male screw, and a pinion or screw gear provided from the arm 19 may be engaged with the rack or male screw, and the pinion or screw gear may be driven by a motor controlled by a computer. mask frame 3
It is desirable that the lower surface of the plate 5 be a concave arc-shaped surface that is approximately in contact with the plate-making roll R. In this case, the plate making roll R
Since there are various diameters, the radius of curvature of the lower surface of the mask frame 35 is preferably matched to the plate-making roll R having the largest diameter.

(5-2) Effect To block light according to the size of the original portion of the original film F wound on the plate-making roll R, the ultraviolet irradiation device is installed while the push rolls 17, 17 are placed on the plate-making roll R. 28 to the opposite side, open the upper part of the push rolls 17, 17, and push the push roll 1 from above.
7 and 17, grasp the adjustment rod 38, and adjust the inner surface of the mask frame 35 so that it does not cover the original part of the original film F, and then adjust the reel-shaped mask frame 35 corresponding to the pair of mask frames 35, 35 adjusted in this way. Pull out the strip masks 31, 31 and remove the magnetic piece 3.
Adjust the interval between steps 2 and 28, and then turn on the ultraviolet irradiation device 28.
Stand up again and remove the mask piece 35 and magnetic piece 32.
All you have to do is make it absorb.

If the ultraviolet irradiation device 28 is configured so that it cannot be tilted sideways to the opposite side, even if you look from above the push roll 17 on the front side, you will not be able to see which side of the original film F the lower edge of the inner surface of the mask frame is wrapped around the plate-making roll R. Since it is difficult to see whether the band has reached the desired position, adjust the mask frames 35, 35 while the push rolls 17, 17 are lifted above the plate-making roll R, and the original film F is not wound around the plate-making roll R. The masks 31, 31 may also be adjusted.

In a configuration in which the adjustment rod 38 is operated from the front, providing a scale on the adjustment rod 38 makes it easier to adjust the light shielding.

If the configuration does not include the adjustment rod 38, the mask piece 35 is directly adjusted manually.

The pulled-out strip mask 31 is attracted to the magnet 33, so the magnetic piece 32 and the mask piece 3
Even if it is separated from the casing 36, the restoring force prevents it from being drawn into the casing 36 and it is stopped, and it is also possible to pull it out by hand.

Since the pulled-out strip mask 31 fits into the guide 29a provided at the edge of the opening of the irradiation hood 29, the ultraviolet light is irradiated only between the mask frames 35 and 35 without leaking, resulting in printing errors due to light leakage. will be completely eliminated.

(6) Effects As explained above, the irradiation range limiting mechanism of the ultraviolet irradiation device in the printing machine for plate-making rolls of this invention consists of magnetic metal plates at each end of the irradiation hood and is wound into a reel. Attach a strip mask that has been rolled up so that it returns to its original state, and then extend this strip mask and fit it into the guide provided at the edge of the opening of the irradiation hood.A magnetic piece is attached to the tip of the strip mask, and each strip mask is A magnet is installed from the irradiation hood under the mask attachment point to attract the strip mask, and a mask piece that is loosely held between a pair of push rolls is installed, and the magnet piece attached to the top surface of this mask piece and the above magnetic It has a structure that allows it to be attached to the piece.

Therefore, the irradiation range limiting mechanism of this invention is
Both ends of the opening of the irradiation hood can be masked as desired using a strip mask by manual operation, and both ends in the roll axis direction between the presser rolls can also be masked as desired with masking pieces. Adjustment of the mask range according to the position can be done easily and reliably without any trouble, and even if the original film
Even if the original part is provided across the entire width of the original mount, the irradiation light can only be applied to the entire width of the original mount, and even if the ultraviolet irradiation device has a function to roll over for maintenance and inspection, the mask frame and magnetic piece will be separated. Since this is possible, it has various excellent effects without impairing this function.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional plate-making roll printing machine. Figure 1 is a left side view, Figure 2 is a left side view in a pre-baking state, and Figure 3 is a left side view in a baked state. It is a diagram. FIG. 4 is a front view of the irradiation range limiting mechanism of the ultraviolet irradiation device in the printing machine for plate-making rolls according to the embodiment of this invention, and FIG. 5 is a sectional view as seen from the left side. Furthermore, if an embodiment is adopted in which an adjustment rod is attached to each mask frame, and this adjustment rod is inserted through the outside of the arm so that it can be operated from the outside of the arm, in addition to the above-mentioned effects, even more
This has the effect of improving operability. R...Prepress roll, F...Manuscript film, 1,
2... Spindle, 17, 17... Presser roll,
28... Ultraviolet irradiation device, 29... Irradiation hood,
31, 31... Strip mask, 32... Magnetic piece, 33... Magnet, 34... Magnet piece, 35, 35
...Mask frame.

Claims (1)

[Scope of utility model registration request] A plate-making roll is supported horizontally at both ends by a pair of spindles, a manuscript film is wrapped around the plate-making roll, and a pair of push rolls press the manuscript film from above, and ultraviolet rays are irradiated from above between the pair of push rolls. In a printing machine for plate-making rolls, which uses a device to irradiate ultraviolet rays through an irradiation hood to print on the plate-making roll, each side end of the irradiation hood is made of a magnetic metal plate that is rewound and restored into a reel shape. Attach the band mask wrapped around the
This strip mask is pushed out and fitted into a guide provided at the edge of the opening of the irradiation hood, and a magnetic piece is attached to the tip of the strip mask. A mask piece was provided to be attached to the strip mask, and a mask piece was provided with both sides formed with concave surfaces that were in close contact with the push rolls, and was loosely held between a pair of push rolls, and was attached to the top surface of this mask piece. 1. An irradiation range limiting mechanism for an ultraviolet irradiation device in a printing machine for plate-making rolls, characterized in that a magnet piece is attracted to the magnetic piece.