JPS6358351B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field The present invention relates to an NC multi-sided printing machine for plate-making rolls, and more specifically, to an NC multi-sided printing machine for plate-making rolls. The suspended original film is clamped by the original film wrapping drum, the other end is clamped by the original film clamping device, the original film wrapped drum is driven by a torque motor to apply tension to the original film, and the arm is lowered to remove the original. The film is overlapped against the plate-making roll by a wrapping angle corresponding to at least the ultraviolet irradiation range, and is pressed by a pair of presser rolls installed on an arm, and while the plate-making roll is rotated, the pair of presser rolls are pressed by an ultraviolet irradiation device installed on the arm while giving rotation to the plate-making roll. For plate-making rolls that perform printing by irradiating ultraviolet rays through the
The present invention relates to an NC multi-sided printing machine, and particularly relates to an improvement of an ultraviolet irradiation device with an irradiation range limiting mechanism, an improvement of a clamp device for clamping one end of an original film, and an improvement of an arm descending speed control mechanism.

(2) Background Art Conventional NC multi-sided printing machines for plate-making rolls include those shown in Figs. 1 to 3. To explain the structure, 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, and the threaded block 11 fixed to the tailstock 7 is threadedly engaged with the threaded shaft 10, so that the screw shaft 10 can be rotated on the bed 6. The movement is adjustable. A movable table 12 is mounted on the bed 6, and the movable table 12 is rotated by a motor 13 whose rotation amount is controlled by a computer.
A screw shaft 14 provided therein is rotated, and a screw block 15 fixed to the movable table 12 is screwed into the screw shaft 14, so that it can move freely on the bed 6. A pair of brackets 16, 1 are provided at both ends of the movable table 12 in the spindle direction.
6 is erected, and a pair of arms 1 support a pair of presser rolls 17, 17 and a film winding drum 18 at both ends at the upper ends of the brackets 16, 16, respectively.
9 and 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.
The gears 22, 22, 23, 23 are designed to suppress the moment action of the gears 22, 22, 23, 23 by extending and driving the air cylinder devices 21, 21.
The arms 19, 19 are arranged to cover the upper side of the plate-making roll R, and the presser rolls 17, 17 are arranged to ride on the plate-making roll R at this time. 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 film fixing piece 24 which is pivotally supported at both ends to the brackets 16, 16, so that the original film F can be held in the film winding drum 18. Reference numeral 18 is configured such that the original film F can be tensioned by a torque motor 25. The two presser rolls 17, 17 are mounted on support frames 26, 26 which are pivotally connected to the respective arms 19, 19.
The supporting frame 2
6 and 26 can be reset by two springs 27 and 27, respectively, so that the presser rolls 17 and 1
7 is configured so that it can be placed on the plate making roll R even if the plate making roll R is different in size. Arm 19,
19 is provided with an ultraviolet irradiation device 28 on the upper side corresponding to between the presser rolls 17, 17, and an irradiation hood 29 is provided from the device 28 between the ultraviolet irradiator 28 and the presser rolls 17, 17 in the vertical direction. ,
The irradiation hood 29 faces between the presser rolls 17, 17. In addition, the code|symbol 30 is a 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 in a lifted state, 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 reversely moved, 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, 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-mentioned baking, which is applied to the entire surface of the plate making roll R. It is done.

(3) Problems to be solved in the background art The first point is to provide an irradiation range limiting mechanism for the ultraviolet irradiation device.

Now, suppose that the mount width of the original film F is, for example, 60 cm, and a document portion of, for example, 30 cm is copied approximately in the center of the width direction, and if the opening length of the irradiation hood 29 is, for example, 50 cm, the irradiated light will exceed 60 cm. To prevent leakage, place a 10cm strip on each side 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 blocking light by attaching thin light-shielding masks of about 10 cm width to each end of the original film in the width direction 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.

The second problem to be solved in the background art is to improve the clamp device.

Now, one end of the original film F is held in the film winding drum 18, the other end is held in the film fixing piece 24, and the film winding drum 18 is further driven by the torque motor 25 to release the original film F from the tensioned state. The cylinder devices 21, 21 are driven to retire and the arms 19, 19 are lowered. Then, until the original film F comes into contact with the plate-making roll R, if the inclination of the original film F changes gradually due to the lowering of the arm 19, there is a slight play in the pivot rotation of the film fixing piece 24. Since the tension applied to the original film F is small, the film fixing piece 24 rotates following the change in the inclination of the original film F, and sometimes stops instantaneously. Since the tension force on the original film F is small after the original film F contacts the plate-making roll R, even if the arms 19, 19 continue to descend, the direction of clamping of the original film F by the film fixing piece 24 is no longer fixed. As the arms 19, 19 descend, the film continues to be wound around the plate-making roll R. Therefore, each time the original film F is wound, there is a winding deviation of about 0.1 m/m at the maximum. Such a large winding deviation is caused by a gap of 0.1 m/m between the pattern joints, no matter how accurately the computer controls the rotation of the plate-making roll when creating a continuous pattern in the circumferential direction of the plate-making roll by multi-sided printing. In addition, in color printing such as a gravure plate, since overprinting is performed, color misregistration and image misregistration occur, which is a fatal drawback in that a clear image cannot be obtained.

If the torque of the torque motor 25 is increased to apply a large tension to the original film F, the play of the film fixing piece 24 can be ignored, but if the tension becomes large, there is a risk that the original film F may slip during printing. However, since the original film also stretches and the winding misalignment remains, the tension cannot be increased, so the tension is kept to the minimum necessary (1 to 2 kg/cm).

On the other hand, the above-mentioned film fixing piece 24 has a structure in which the original film F is clamped by an upper piece and a lower piece, and two or three pins are provided on the clamping surface of the lower piece.
This pin is passed through a small hole in the original film F, and then the upper piece is applied.In order to maintain high wrapping precision of the original film F around the plate-making roll R, the diameter of the pin is adjusted to It is designed to fit snugly into a small hole in the film F.

Therefore, conventionally, when removing the original film F after printing, the operator has to remove the plate-making roll R.
Lean over and remove the upper piece of the film fixing piece 24 on the opposite side, and then remove the original film F.
It was a very troublesome task to unfit the bottom piece from the pin that could pivot. That is,
The original film F can be smoothly removed by keeping it parallel to the clamping surface of the lower part of the film fixing piece 24 that can pivot and separating it in the vertical direction. Very difficult to remove. Therefore, it is desired to provide an original film clamp device that can easily remove the original film F with one hand.

The third problem to be solved in the background art is to provide an arm descending speed control mechanism.

Now, if the air cylinder devices 21, 21 are ignored, the rotational moment that the arm 19 is about to exert toward the plate-making roll R can be made extremely small by providing the balance weight 20 on the arm 19, and thereby the air cylinder device 21, 21 output is reduced, and presser rolls 17, 17
The plate-making roll R is designed not to deflect even when the rotational moment from the air cylinder devices 21, 21 is applied. Furthermore, if the descending speed of the arm 19 is fast, the presser rolls 17, 17 will bounce against the plate-making roll R, and the deflection of the plate-making roll R due to the dynamic load will increase. (valve) to slow down the descending speed of the arm 19. However, if the lowering speed of the arm 19 is slow, work efficiency will be reduced. In particular, in the case of multi-sided printing, the arm 19 must be raised and lowered many times, so if the lowering speed of the arm 19 is increased, the printing time can be significantly shortened and work efficiency will be significantly improved, so improvements are desired.

(4) Disclosure of the Invention The NC multi-sided printing machine for plate-making rolls of the present invention was devised in view of the three points mentioned above.The first point, the irradiation range limiting mechanism, includes reel-shaped masks at both ends of the irradiation hood. By positioning the mask and guiding this mask to the underside of the irradiation hood, both ends of the opening of the irradiation hood can be masked as desired.Also, a pair of mask pieces is slidably hooked between the presser rolls and this mask piece is placed above the irradiation hood. By connecting to a reel-shaped mask, both ends of the roll axis between the presser rolls can be masked as desired, making it easy to adjust the mask range according to the size and position of the original part of the original film F. In addition, even if the original portion of the original film F is provided over the full width of the original mount, the irradiation light can only be applied to the entire width of the original mount, which may impede the ability to turn over the ultraviolet irradiation device for maintenance, inspection, etc. Regarding the second point, the clamping device is not a pivot type like the conventional one, but has a lower clamping piece with a fixed clamping surface and an upper clamping piece that can be raised and lowered by connecting with guide means and driving means. By making it possible to clamp the original film and providing a guide rod for passing the original film on the front side of the film fixing piece, the clamping end of the film fixing piece becomes an acute angle when the original film changes its inclination as the arm moves up and down. This prevents the original film from being damaged when the original film is clamped, and the original film can be clamped in the same direction at all times to eliminate misalignment during printing. By vacuum adsorbing the original film to the upper piece around the area where it is fitted to the pin on the lower piece, the original film can be automatically removed from the pin, and can be removed by simply pulling the original film towards you. The third point, the arm descending speed control mechanism, uses a sensor to detect when the arm approaches the plate-making roll, and until then the descending speed is fast.
After that, the air cylinder device that drives the arm is controlled by a pneumatic circuit so that the speed of the arm is slowed down, which greatly shortens the printing time and improves work efficiency.Moreover, it is possible to keep the output of the air cylinder device small and roll the plate making roll. This is an improvement that reduces the film presser load applied to the plate and eliminates the risk of deflection of the plate-making roll.

(5) Best mode for carrying out the invention (5-1) Configuration The NC multi-sided printing machine for plate-making rolls of the present invention has the following features:
A pair of spindles capable of horizontally supporting both ends of the plate-making roll are provided, one spindle is connected to a first motor capable of controlling and driving the amount of rotation of the spindle, and the plate-making roll is positioned below the plate-making roll supported by the pair of spindles. A movable table movable in the spindle direction is provided, and this movable table is connected to a second motor capable of controlling and driving the amount of movement of the movable table,
A bracket is provided so as to stand on one side of the plate-making roll above the movable table, and an arm that can swing in a vertical plane is provided so as to cover the plate-making roll orthogonally from the bracket, and this arm is raised from the movable table to one side of the plate-making roll. This arm can be raised and lowered by an air cylinder device, and is equipped with a pair of presser rolls that run parallel to the plate-making rolls and rest on the plate-making rolls at positions corresponding to the plate-making rolls. The apparatus is equipped with an ultraviolet irradiation device with an irradiation hood attached to the arm, and is further equipped with an original film wrapping drum at a position ahead of the presser roll of this arm, and a clamping device that connects this to a torque motor to clamp one end of the original film. A prerequisite configuration requirement is that the plate-making roll is provided with a movable table on the side opposite to the document film winding drum.

4 to 10 show embodiments of the present invention, and except for improved parts, the structure is the same as that of the conventional printing machine shown in FIGS. 1 to 3. A detailed explanation will be omitted, and in FIGS. 4 to 10, the same components as in FIGS. 1 to 3 are denoted by the same reference numerals.

FIGS. 4 and 5 show an improved ultraviolet irradiation device equipped with an irradiation range limiting mechanism.
Reel-shaped strip masks 31, 31 made of magnetic metal plates are attached to both ends of the irradiation hood 29, and the strip masks 31, 31 are guided to a guide 29a formed at the edge of the opening of the irradiation hood 29. A magnetic piece 32 made of a metal plate is attached to the tip, and a strip mask 3 is attached below the attachment point where the strip mask 31 is stored in a reel shape.
1 is attached to the irradiation hood 29, and the other side surfaces are formed into arc-shaped concave surfaces, and the pair of presser rolls 17,
17 and a magnet piece 34 on the top surface.
It is characterized by attaching a pair of mask pieces 35, 35 which are embedded with each other, and adhering each magnet piece 34 to the corresponding magnetic piece 32 at the tip of the strip mask 31. 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. The magnet 33 and the mask opening 33a of the casing 36 are aligned on a plane. It is preferable that each mask frame 35 is provided with an adjustment rod 38, which passes through the support frame 26 that supports the shafts of the presser rolls 17, 17, and further through the arm 19, and extends outside the arm 19. Manual movement in the axial direction is possible on both sides. The axial movement of the adjustment rod 38 may be automatic. For that, adjustment rod 38 and mask frame 3
The adjusting rod 38 is not fixed integrally with the arm 19, but is rotatably mounted, and the adjusting rod 38 is provided with a rack or a male thread, and a pinion or screw gear provided from the rack or male thread arm 19 is engaged with the pinion or screw. The gears may be driven by a motor controlled by a computer. It is desirable that the lower surface of the mask frame 35 be a concave surface on an arc that is approximately in contact with the plate-making roll R. In this case, since the diameters of the plate-making roll R vary in size, the radius of curvature of the lower surface of the mask frame 35 is preferably matched to the plate-making roll R with the largest diameter.

6, 7 and 8 show improvements in the clamping device. This clamp device includes a lower clamp piece 39 and an upper clamp piece 40 for clamping the original film F, and also allows the original film F to pass near the plate-making roll R whose lower surface is approximately at the same height as the clamping surface of the lower clamp piece 39. It is formed by horizontally supporting a guide rod 41. The lower clamp piece 39 is placed horizontally on the movable table 12 via a support 42, and positioned so that the clamp surface (upper surface) of the lower clamp piece 39 is a required dimension lower than the upper surface of the plate-making roll R having the minimum diameter. A plurality of pins 43, preferably two or three, are provided protruding from the clamp surface of the lower clamp piece 39.
On the other hand, the upper clamp piece 40 is connected to a guide means and is movable up and down so as to overlap and lift up on the lower clamp piece 39. The guide means includes a rod 44 and a sleeve 45 fitted on the outside thereof.
Either one of the rod 44 and the sleeve 45, for example the sleeve 45, is attached to the lower clamp piece 39, and the rod 44 is attached to the upper clamp piece 40. A spring 46 is fitted to the lower end of a rod 44 extending below the sleeve 45, and a nut 47 is screwed onto the spring 46 to bias the spring 46, thereby making it possible to finely adjust the clamping force. The driving means uses an air cylinder device 48, which has two links 4 connecting the piston head 48a.
The upper clamp piece 40 is connected to the clamp upper piece 40 via the brackets 9 and 50, and the cylinder bottom 48b is connected to the rear surface of the movable table 12. It is fixed. The driving means for raising and lowering the upper clamp piece 40 may be, for example, a motor and a pinion rack mechanism, instead of an air cylinder device. A pin 43 protruding from the lower clamp piece 39 is provided on the clamp surface (lower surface) of the upper clamp piece 40.
A plurality of escape holes 52 corresponding to the escape holes are formed, and a plurality of air suction holes 53 are formed around the escape holes, or a plurality of air suction holes 53 are formed in an annular shape. It is connected via. The structure of the vacuum generator 54 is a well-known ejector structure in which there is a nozzle between the air introduction port and the air exhaust port, and the vacuum generation port that communicates with the nozzle back pressure section. The introduction port is connected to a compressor (not shown) via a flexible hose 56.

9 and 10 show a mechanism for controlling the descending speed of the arm. In FIG. 9, a pair of light-emitting elements 57 are arranged so that the light beam is blocked by the plate-making roll R when the distance t between the plate-making roll R and the line connecting the lower surfaces of the presser rolls 17, 17 is about 5 cm.
A light receiving element 58 is provided from the arm 19.
That is, the light-emitting element 57 and the light-receiving element 58 constitute a sensor that can detect when the arm 19 approaches the plate-making roll R closely to a predetermined dimension.

As shown in FIG. 10, a proximity switch 59 whose output can be adjusted may be attached to the arm 19 so as to correspond to the upper surface of the plate-making roll R.
Although not shown, a limit switch may also be used. However, if a limit switch is used, it is necessary to install it so that it can be adjusted since the diameter of the plate-making roll R varies in size. The retired drive side cylinder chamber 21a of the air cylinder device 21 has three
It is connected to the port switching valve 60 and further connected to the manifold 61, and the telescopic drive cylinder chamber 21b of the air cylinder device 21 is connected to the 3-port switching valve 6.
2 and a pressure reducing valve 63, and further connected to a manifold 61. Manifold 6
1 is supplied with high pressure air from a compressor 65 which has been reduced to a predetermined pressure through a pressure reducing valve 64. However, the cylinder chamber 21a
and 21b are filled with air at different pressures, e.g. 6Kg/cm ²
and 4 kg/cm ² respectively, and when pressurized air flows into both cylinder chambers, the piston retires due to the pressure difference and descends at a gentle speed, allowing the arm 19 to descend. Note that, unlike the above, cylinder chamber 2
1b, and when the piston ^extends , the arm 19
It may also be configured so that it descends. Reference numeral 66 is a control unit, which inputs a detection signal when the light receiving element 58 detects that the light beam from the light emitting element 57 is blocked by the plate making roll R;
The switching valve 62 is controlled so that high pressure air from the manifold 61 flows into the extension drive cylinder chamber 21b.

(5-2) Operation The original film F is attached after the arm 19 is raised to the highest position by the air cylinder device 21 and the plate-making roll R is supported by the spindles 1 and 2, as shown in FIG. Returning to FIGS. 6 to 8, the original film F
Clamping is performed by a clamping device before the film winding drum 18. First of all, the seventh
Air cylinder device 48 for clamping as shown in the figure
and lift up the upper clamp piece 40. 9th
To explain in detail with reference to the figure, high pressure air from the compressor 38 is transferred to the pressure reducing valve 37 and the manifold 3.
4. The air is allowed to flow only into the extension drive side cylinder chamber 21b of the air cylinder device 21 through the pressure reducing valve 36 and the switching valve 35, so that the piston is in an extended state and the arm 19 is in a raised state. Then, as shown in FIG.
One end of the document film F is smoothly placed on the clamp lower piece 40 by fitting the pin 43 of the clamp lower piece 39 into a hole drilled in a predetermined position at the same end, and then air The cylinder device 48 is driven to extend and the clamp upper piece 4 is
0 onto the original film F, the clamping by the clamping device is completed. The other end of the original film F is connected to the switching valves 60 and 6 in FIG.
2, and after an instant, closing a stop valve (not shown), the arm 19 is lowered by a predetermined distance so that the operator can reach the document film winding drum, and then clamp the document film to the drum. Thereafter, the film winding drum 18 is rotated by the torque motor 25 shown in FIG. 1 to apply tension to the original film F. In this state, it becomes as shown in FIG. With the above, the original film F
installation is completed.

Original film F wound on plate-making roll R
To block light according to the size of the original part,
Once the arm 19 is lowered, the presser roll 17,
17 is placed on the plate-making roll R, turn the ultraviolet irradiation device 28 sideways to the opposite side, and press the presser roll 1.
Open the upper parts of 7 and 17, look between the presser rolls 17 and 17 from above, grasp the adjustment rod 38, and adjust so that the inner surface of the mask frame 35 does not cover the original part of the original film F, and adjust in this way. Corresponding to the pair of mask pieces 35, 35, the reel-shaped strip masks 31, 31 are pulled out, the interval between the magnetic pieces 32 is adjusted, and then the ultraviolet irradiation device 28 is set up again to remove the mask pieces 35.
and the magnetic piece 32 is attracted. Arm 1 above
9 will be described in detail later.

If the ultraviolet irradiation device 28 is configured so that it cannot be tilted sideways to the opposite side, presser roll 17 on the front side
Even if you look from above, it is difficult to see where the lower edge of the inner surface of the mask frame is on the original film F wrapped around the plate-making roll R, so press the presser roll 1.
7 and 17 are lifted from the plate-making roll R, and therefore the document film F is not wound around the plate-making roll R, the relative position is measured by the scale, the mask pieces 35 and 35 are adjusted, and the band mask is removed. 31 and 31 are also adjusted.

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

For configurations without adjustment rod 38,
The mask frame 35 is directly adjusted manually.

Since the pulled-out strip mask 31 is attracted to the magnet 33, even if the magnetic piece 32 and the mask piece 35 are separated, the casing 3 is held back by the restoring force.
It can be stopped without being retracted into 6, and it can also be freely pulled 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 disappear. When the adjustment of the light shielding range is completed as described above, the arm 19 is lifted. Lifting of the arm 19 will also be described later.

Next, the computer drives the motor 13 to position the movable table 12 at the right end of the printing roll R shown in FIG. 1, which is the printing start position.

Next, the switching valves 60 and 62 shown in FIG. 9 are switched together to lower the arm 19. In this case, the flow rate of pressurized air flowing into the retiring drive side cylinder chamber 21a of the air cylinder device 21 is adjusted so that the arm 19 descends at a predetermined high speed. The arm 19 descends at a predetermined high speed,
The upper surface of the plate-making roll R and a pair of presser rolls 17,
When the distance t from the line connecting the lower surface of 17 reaches about 5 cm, this point is detected by the transmitting/receiving element 57 and the light receiving element 58 or the proximity switch 59 shown in FIG. The valve 62 is switched and pressurized air also flows into the extension drive side cylinder chamber 21b of the air cylinder device 21. Therefore, the cylinder chamber 21
A pressure of 6Kg/ ^cm2 is applied to cylinder chamber 2.
A pressure of 4.5Kg/cm ² is applied to 1b, and a compensating pressure of 1.5Kg/cm ² is applied to the piston in the downward direction. Therefore, the arm 19, which has descended at a predetermined high speed, decelerates to a gentle speed and descends, allowing the presser rolls 17, 17 to press and ride the original film F without bouncing against the plate-making roll R. Become. The load applied to the plate-making roll R is the sum of the rotational moment of the arm 19 and the 1.5 kg/cm ² offset pressure of the air cylinder device 21, so it can be kept small, and therefore the plate-making roll R is deflected. There is no risk of this occurring. Also, as described above, the air cylinder 21 is driven to retire and the arm 19
As the original film F is lowered, the original film F gradually becomes sloped gently, but in this case, in the conventional printing machine shown in FIGS. Friction is involved in the pivot rotation of the original film F, and the tension exerted by the torque motor is minimal. Therefore, the rotation is delayed slightly as the inclination of the original film F changes, and sometimes stops instantaneously. Since the film F contacts and wraps around the plate-making roll, the wrapping of the original film F around the plate-making roll R is unevenly performed each time, and the deviation is about 0.1 m/m at maximum.However, in this invention, the original film Since the directionality of the clamp of the film F is always constant without fluctuation, the winding deviation is reduced and can be suppressed to about 0.01m/m at the maximum. Furthermore, since the guide rod 41 guides the document film F, the document film F under tension will not be bent or damaged by the edges of the clamp upper piece 40. When the lowering of the arm 19 is completed and the wrapping of the original film F around the plate making roll R is completed, printing is performed by the ultraviolet irradiation device 28. The baking process is the same as the conventional baking process mentioned at the beginning, so it will be omitted.

When printing is completed, lift the arm 19 and remove the original film F. To lift the arm 19, leave the switching valve 62 in place.
0 so that air pressure is applied only to the expansion cylinder chamber 21b of the air cylinder device 21. In this case, the air pressure is 4.5Kg/cm ² , so
The air cylinder device 21 raises the arm 19 against the rotational moment due to gravity of the arm 19. In order to raise the arm 19 at a predetermined high speed, the flow rate of pressurized air flowing into the cylinder chamber 21b is also adjusted. The original film F is removed from the film winding drum side first. In this case, the torque motor 25 stops driving. To remove the original film F from the clamp device, the air cylinder device 48 is contracted and the upper clamp piece 40 is raised.At the same time, air is supplied to the vacuum generator 54 by an air supply device (not shown) to generate a vacuum, and the upper clamp piece is removed. The original film F is sucked by the air suction hole 53 of 40, and the lower clamp piece 39 is disengaged from the pin 43. Therefore, it is sufficient to simply pull the original film F towards you.
Conventionally, the removal of the document film F was troublesome, and if done sloppily, it could be damaged due to fitting with the positioning pin 43, but in the present invention, it can be done easily and without being easily damaged.
After removing the original film F, remove the plate-making roll R.
is removed from a pair of spindles and transferred to the developing process.

(6) Effects As explained above, the NC multi-sided printing machine for plate-making rolls of the present invention has (6-1) magnetic metal plates on both sides of the irradiation hood, which are rewound and restored into a reel shape. Attach the band mask that has been rolled up in the following manner, extend the band mask, fit it into the guide provided at the edge of the opening of the irradiation hood, attach a magnetic piece to the tip of the band mask, and attach each band mask. A magnet is installed under the irradiation hood to attract the strip mask, and a mask piece that is loosely held between a pair of push rolls is installed, and a magnet piece attached to the top surface of this mask piece is attached to the magnetic piece. Since we have improved the ultraviolet irradiation device with an irradiation range limiting mechanism, it is possible to mask both ends of the opening of the irradiation hood as desired with a band mask by manual operation, and also cover both ends of the roll axis between the presser rolls. It can be masked as desired with the mask frame, and the original film F
Adjustment of the mask range according to the size and position of the document part can be done easily and reliably without any trouble, and even if the document part is provided over the entire width of the document holder of the original film F, the irradiation light can only be applied to the entire width of the original holder. Even if the UV irradiation equipment has the function of turning over for maintenance and inspection, it has various excellent effects such as the ability to separate the mask piece and the magnetic piece without damaging this function. In addition to the above-mentioned effects, operability is further improved if an adjustment rod is attached to the mask piece and the adjustment rod passes through the outside of the arm so that it can be operated from the outside of the arm. (6-2) The upper clamp piece is lifted with respect to the lower clamp piece by the guide means and the driving means, and the pin provided on the clamp surface of the lower clamp piece is installed closer to the plate-making roll than the lower clamp piece. Place one end of the original film on the lower clamp piece by fitting it into the hole made in one end of the original film passed under the guide bar, and then operate the driving means to lower the upper clamp piece. The original film is clamped, and after printing, the upper part of the clamp is lifted, and at the same time, the air suction hole in the upper part of the clamp is used to perform vacuum suction to lift the original film. It can be clamped in a constant direction without wobbling, and the conventional film fixing piece is a pivot type, which prevents the original film from wrapping around the plate-making roll by up to 0.1m/m.
It is possible to suppress the heat to about 0.01 m/m, which is 1/10th of that, making it possible to make the seams invisible when creating continuous patterns by multi-sided printing, and to avoid color misalignment in color printing plates. The clarity of the image is significantly improved by eliminating image shift, and the document film is clamped strongly by driving the document film winding drum with a torque motor to apply tension to the document film without causing bending scratches or damage due to the edges of the clamp upper piece. Furthermore, the original film can be removed by simply pulling the original film toward you, as the original film is brought into close contact with the upper clamp piece that is raised by air suction, and the pin on the lower clamp piece is released. (6-3) A sensor detects the point when the arm approaches the plate-making roll, and until this sensor detects the point, one cylinder chamber of the air cylinder device is closed. Pressure air of a predetermined flow rate and predetermined pressure is flowed into the cylinder chamber to lower the arm at a predetermined high speed, and after detection, air with a lower air pressure than that flowing into the one cylinder chamber is flowed into the other cylinder chamber to create a reverse pressure. The present invention has been improved by providing an arm lowering speed control mechanism configured to delay the movement of the piston by substantially reducing the pressure acting to move the piston, thereby delaying the lowering of the arm as desired. By simply installing a sensor and modifying the pneumatic circuit, the lowering speed of the arm can be made much faster than before. Especially in multi-sided printing machines, the baking time can be greatly shortened, work efficiency can be improved, and the presser roll can be The output of the air cylinder device when riding on the plate-making roll can be suppressed to a small value by back pressure offset, so that the film pressing load applied to the plate-making roll can be reduced, and the effect is that there is no risk of the plate-making roll being deflected.

[Brief explanation of the drawing]

Figures 1 to 3 are conventional NCs for plate-making rolls.
FIG. 1 is a front view, FIG. 2 is a left side view in a pre-baking state, and FIG. 3 is a left side view in a baked state. 4 to 10 show an NC multi-sided printing machine for plate making rolls of the present invention, and FIGS. 4 and 5 show a plan view and a side view of an improved irradiation range limiting mechanism of an ultraviolet irradiation device,
6, 7, and 8 are a side view of the original film clamp device in a clamped state, a side view of the unclamped state, and a view taken in the direction of the − arrow in FIG. 6, and FIG. 9 is a view of the lowering speed control mechanism of the arm. The principle diagram and FIG. 10 are diagrams showing a modification of the sensor in the same as above. R...Prepress roll, F...Original film, 1, 2...
Spindle, 17, 17... Presser roll, 28... Ultraviolet irradiation device, 29... Irradiation hood, 31, 31...
Strip mask, 32...Magnetic piece, 33...Magnet, 3
4... Magnet piece, 35, 35... Mask piece, 39... Lower clamp piece, 40... Upper clamp piece, 41... Guide rod, 43... Pin, 44, 45... Guide means (rod, sleeve), 48... Drive means (air cylinder device), 52... escape hole, 53... air suction hole, 57,
58, 59...Sensor (light emitting element, light receiving element, proximity switch), 60, 62...Switching valve.

Claims (1)

[Claims] 1. A pair of spindles capable of horizontally supporting both ends of the plate-making roll is provided, one spindle is connected to a first motor capable of controlling and driving the amount of rotation thereof, and the plate-making roll is supported by the pair of spindles. A movable table movable in the spindle direction is provided below the plate-making roll, and this movable table is connected to a second motor that can control and drive the movement amount, and one side of the plate-making roll is attached from above the movable table. A bracket is provided so as to stand up, and an arm is provided that can swing in a vertical plane so as to extend orthogonally over the plate-making roll from the bracket, and this arm can be raised and lowered by an air cylinder device provided from a movable table. This arm is equipped with a pair of press rolls that sit on the plate-making roll in parallel with the plate-making roll at a position corresponding to the plate-making roll, and an ultraviolet irradiation device with an irradiation hood attached above between the pair of press rolls. Furthermore, this arm is equipped with a document film winding drum at a position ahead of the presser roll, which is connected to a torque motor, and a clamping device for clamping one end of the document film is installed on the opposite side of the document film winding drum with respect to the plate making roll. In an NC multi-sided printing machine for plate making rolls, which is configured with a movable table installed in the hood, in order to limit the irradiation range of the above-mentioned ultraviolet irradiation device, magnetic metal plates are placed at each end of the irradiation hood and wound into a reel. Attach a strip mask that has been rolled up so that it returns to its original state, 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. A magnet is installed from the irradiation hood below the mounting point of the plate mask and is attracted to the strip mask, and both sides are formed into concave surfaces that closely contact the push rolls. An irradiation range limiting mechanism is provided in which a mask piece is provided and a magnet piece attached to the upper surface of the mask piece is attracted to the magnetic piece, and the clamp device has a lower clamp piece and an upper clamp piece for clamping the original film. The lower clamp piece has a pin on its clamp surface and is positioned at a predetermined distance from the plate-making roll, and the upper clamp piece has a hole corresponding to the pin on its clamp surface, and air is sucked around this hole. A guide rod that has a hole and is movable up and down by appropriate guide means and drive means, connects the air suction hole to the vacuum generation means, and allows the document film to pass through near the plate-making roll at approximately the same height as the lower clamp piece. Furthermore, in order to control the descending speed of the arm, the cylinder chambers on both sides of the piston of the air cylinder device for driving the arm up and down are respectively connected to separate switching valves, and furthermore, each cylinder The chambers are connected to pressure air sources that supply pressurized air at predetermined pressures, respectively, and the air cylinder device is configured such that when high pressure air flows into one cylinder chamber and the piston is actuated, the arm is lowered. A suitable sensor is installed to detect when the arm is close to the plate-making roll, and when pressure air is flowing into one of the cylinder chambers, low pressure air is also supplied to the other cylinder chamber. An NC multi-sided printing machine for plate-making rolls, characterized by being equipped with a descending speed control mechanism configured to switch a switching valve that allows low-pressure air to pass through.