JPH0768746A - Vertical register initial preset system for multicolor gravure printer - Google Patents

Abstract

PURPOSE:To call the same intrinsic position of a plate cylinder even at the time of using with other printer having different web path with the same cylinder by obtaining a vertical register correction amount by calculation, driving a register roll and controlling a position through a printer controller and calling a peripheral length of the cylinder, a mark position and a preset value. CONSTITUTION:When a vertical register correction amount K2mm for initially registering a plate cylinder 21 of a printing unit U2, 1/2 of the amount K2mm is transmitted from a preset position 42 to a printer controller 41 as a preset value K2/2mm of a register roll 25 position. Then, a preset value K2/2mm is output from the controller 41 to a driver of the roll 25 as a preset position of the roll 25, and vertical register initial preset position control of the roll 25 is executed. Even in the case of other multicolor gravure printer having different web path, the path is previously input to the preset position, a mark position of the same cylinder is called, and this calculation is repeatedly executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an initial preset system for performing registration in the vertical (web flow) direction at the start of printing in a multicolor gravure printing machine.

[0002]

2. Description of the Related Art Conventionally, in a multicolor gravure printing machine, in order to register characters / designs printed in each color unit in the vertical (web flow) direction, a register roll for changing the web path length between each color unit is used. Is provided to displace the register roll position so that the web path length is an integral multiple of the plate cylinder circumference, and a differential gear mechanism that can adjust the plate cylinder phase of each color unit is provided in the plate cylinder drive unit. A method is adopted in which the synchronous rotation positions of the characters and designs made on the plate cylinder are aligned. In the former method of displacing the register roll position, the movement amount requires a stroke equivalent to about 1/2 of the maximum plate cylinder circumference length, and the tension fluctuation can be caused by greatly changing the web path length between each color unit. When it occurs, there is a disadvantage that it is difficult to stabilize the registration until the equilibrium state is reached.In the latter method of aligning the synchronous rotation position of the plate cylinder, a differential gear mechanism is provided in the plate cylinder drive section, which makes the structure complicated and In addition, there are disadvantages in terms of maintenance and cost, which is a disadvantage. Although each has its advantages in that it can eliminate the disadvantages of each other, the reality is that the former method is adopted more than the latter method.

Furthermore, in order to quickly perform registration at the start of printing to reduce printing defects and improve productivity,
In the former case, the position of the register roll is set in advance, and in the latter case, the phase of the plate cylinder is set in advance, and an initial registration device has been developed so as to be in a substantially registered state from the beginning of printing.

An example of the initial registration device in the former method is disclosed in Japanese Patent Application Laid-Open No. 54-85806. In this method, all the plate cylinders of each color unit are set in the same phase, and the reference web path length L _o (mm) between each color unit when the register roll is at the reference position.
Is divided by the plate cylinder circumference C (mm) to obtain a remainder S (mm), and the web path length is L _o −S (mm) or L _o + C −S (mm), that is, an integral multiple of the plate cylinder circumference. The register roll position is moved in advance so that Therefore, the register rolls are arranged between the guide rolls that are parallel to the web path so as to be movable in the parallel direction, and the detector for detecting the moving position of the register rolls is provided to detect the register roll position at all times. Then, the vertical register correction amount of -S (mm) or C-S (mm) with respect to the reference length L _o (mm) of the web path length obtained as described above is 1
It is configured to be able to automatically stop at the set value for initial registration, where / 2 is the amount of movement (mm) from the reference position of the register roll. Furthermore, if you input the web path reference length in advance, you can input the perimeter of the plate cylinder each time and automatically calculate and output the set value, or store the set value of each plate cylinder for each order. Control devices have been developed that can be called and called.

An example of the initial registration device in the latter method is disclosed in Japanese Patent Application Laid-Open No. 56-30863. This method does not move the register roll position so that the web path length between each color unit becomes an integral multiple of the plate cylinder circumference like the former, but the pattern printed by the previous unit is transferred to the next unit. When the pattern cylinder is reached, the plate cylinder drive unit is provided with a differential gear mechanism capable of adjusting the phase so as to match the synchronous rotation position so that the patterns of the plate cylinder are printed in the same phase. And Thus, the control device causes the input pre Uebupasu length L _o (mm), type a plate cylinder circumference C (mm), Uebupasu length L _o (mm) of the plate cylinder circumference C (mm) Divide by to calculate the remainder S (mm), which is the vertical register correction amount -S (mm)
Alternatively, C-S (mm) is divided by the plate cylinder circumference C (mm) to convert it into a rotation adjusting angle of the plate cylinder, and the plate cylinder is supplied via a computing unit so as to give a rotation signal according to the rotation adjusting angle. It is transmitted to the differential gear mechanism of the drive unit to adjust the phase of the plate cylinder to align the design with the synchronous rotation position.

[0006]

By the way, in the initial registration apparatus of the former type in which the register roll position is moved, the initial condition is that the plate cylinder of each color unit sets all the patterns to the same phase. Has become. Therefore, it is necessary to align the cross marks (or register marks), which is the reference of the pattern made on the plate cylinder, in the same phase, for example, all directly above. For this reason, the alignment is visually performed by hand in the beginning, and an automatic alignment device, such as a combination of an optical detection device and a plate cylinder phase rotation mechanism, has been developed as a higher-level control device.

A reference of the rotational phase of the plate cylinder (plate cylinder key)
If the phase difference between the position of the pattern and the pattern (reference is a cross mark) is the same for each plate cylinder, the rotation phase connecting each plate cylinder and the plate cylinder drive unit can be kept constant at all times. Therefore, it is possible to propose that all the plate cylinders can be set to the same phase as in the initial condition just by mounting them, but in the current plate making process, as described above, the reference of the rotational phase of the plate cylinder (plate cylinder key) is used. It is difficult to make the phase difference of the positions (reference is a cross mark) of the pattern made on the plate all the same for each plate cylinder, and it is not practiced.

Therefore, in any of the conventional initial registration devices, after the plate cylinder is mounted on each color unit, a step of setting all the above-mentioned symbols in the same phase is required,
Even with the recent demand for automation, labor saving, and shortening of preparation time, even when a plate cylinder automatic changing device is put into practical use, the effect thereof is greatly impaired by the above process. In addition, the plate cylinder drive unit requires a plate cylinder phase rotation mechanism that matches all the symbols in the same phase, but during normal operation, a phase shift does not occur and a gear coupling with a relatively high phase resolution is used. Even in such a case, there is a drawback that a phase error of one tooth or less cannot be avoided, and if a differential gear mechanism is used, it is possible to perform fine phase adjustment, but the latter disadvantage mentioned above is inherent.

Further, in the conventional method, the reference web path length L _o (mm) and the plate cylinder peripheral length C (mm) are input with the initial condition that all the above-mentioned symbols are set to the same phase, and the initial value is set. The vertical register correction amount required for registration is calculated to obtain the register roll position movement amount, and this initial registration movement amount is applied only to the web path length specific to the gravure printing machine. ) Is managed as
Originally, the amount of movement required for initial registration is specific to the plate cylinder due to the position of the pattern made on the peripheral surface of the plate cylinder, but the same plate cylinder is used for other gravure printing machines with different web passes. When used, there is a problem in that, for example, the same set value (data) stored in a recording medium cannot be directly used as preset data and used.

The present invention has been made in view of the above points, and in a gravure printing machine that performs registering by moving a register roll position, a rotation that connects each mounted plate cylinder and a plate cylinder drive unit. Each plate is a distance on the peripheral surface between the reference of the rotational phase of the plate cylinder (plate cylinder key) and the position of the pattern made on the plate (reference is a cross mark), by adopting a structure that can keep the phase constant at all times. By inputting the mark position of the cylinder, the conventional initial registration device eliminates the preparatory work for setting all the patterns of each plate cylinder in the same phase, which was necessary for the preparation before starting the presetting system. By managing the preset data as the mark position peculiar to the plate cylinder, even when the same plate cylinder is used in another gravure printing machine with a different web pass, the mark position peculiar to the same plate cylinder can be recorded. And to provide a vertical register initial preset system multicolor gravure printing machine it is possible to calculate call to.

[0011]

According to the present invention for achieving the above object, each plate cylinder mounted on a plurality of printing units is disposed so as to face each plate cylinder so as to be able to come into contact with and separate from the plate cylinder. A web path between each impression cylinder, a number of guide rollers arranged to form each web path between each pair of the plate cylinder and the impression cylinder, and a web path between front and rear guide rolls in the middle of each web path. Each register roll formed to be substantially parallel to each other, a drive unit that allows the position of each register roll to move in the parallel direction, a detector for detecting the position of each register roll, and each of the above Multicolor gravure printing including a printing press control device for driving register rolls and position control, and a presetting device having an input unit, a calculation unit, and a storage unit for performing initial registration at the start of printing Vertical orientation of machine The reset system includes a plate cylinder driving unit for mounting and connecting while holding the rotation phases of the plate cylinders the same, and fixing the web path when the register roll between the plate cylinders and the impression cylinder is at the reference position. Path length L _f
(mm) and an arithmetic expression for obtaining a path length L _c (mm) that changes depending on the plate cylinder diameter, and the preset device that is input in advance is divided into the normal direction from the reference phase of each plate cylinder. Input the mark positions M ₁ , M ₂ , ... M _n , ... (mm) and the plate cylinder circumference C (mm) on the circumferential surface, and set the vertical register correction amount K _{n + 1} (mm) = C-{( L _f + L _c −M _n
+ M _{n + 1} )% C} (where% is an operator for finding the remainder), and the vertical register correction amount K _{n +} for initial registration of the plate cylinder of the n + 1th color is performed. ₁ (mm) is calculated and K _{n +} 1/2 (m
(m) is output as a preset value of the register roll position to drive the register roll and control the position via the printing press control device, and the plate cylinder circumference, mark position and preset set value can be recalled. This is the initial preset system for vertical registration of the multicolor gravure printing machine to be stored.

Further, the vertical register initial preset system starts printing and adjusts the vertical register of each color when the mark position M _n (mm) of at least one of the plate cylinders is known. After that, the register roll position of the n + 1th color is detected as K _{n +} 1/2 (mm) by the detector, and K _{n + 1} (mm) is transmitted from the detected value to the preset device via the printing press control device. Then, this value and the input L _f (mm), L _c
(mm), M _n (mm) and C (mm), the mark position M _n + 1 (mm) = C − {(L _f + L _c + K _{n + 1} −
M _n )% C} is calculated to obtain the mark position M _{n + 1} (mm) of the plate cylinder on which the n + 1th color is printed, and all the mark positions of the remaining plate cylinders are calculated in the same manner. The mark position of each of these plate cylinders can be stored in a callable manner as well as obtained.

[0013]

In the vertical alignment initial preset system of the present invention, each plate cylinder mounted on the multi-color gravure printing machine is connected to the plate cylinder drive unit so as to maintain the same rotational phase, and the distance between each plate cylinder and the impression cylinder is increased. The web path when the register roll of is in the reference position is divided into a fixed path length L _f (mm) and an arithmetic expression for obtaining a path length L _c (mm) which changes depending on the plate cylinder diameter, and are input in advance. The preset device is provided with the mark positions M ₁ , M ₂ , ... M on the circumferential surface in the normal direction from the reference phase of each plate cylinder.
_{When n} , ... (mm) and plate cylinder circumference C (mm) are input, the vertical register correction amount K _{n + 1} (mm) = C − {(L _f + L _c −M _n
+ M _{n + 1} )% C} (where,% is an operator for finding the remainder). This calculation is a web path between each plate cylinder and the impression cylinder when the register roll is at the reference position, L _f + L
The mark position M _n (mm) of the nth color plate cylinder is subtracted from _c (mm) to obtain n +
It is the web path from the mark position of the nth color plate cylinder to the mark position of the n + 1th color plate cylinder (L _f + L _c −) by adding the mark position M _{n + 1} (mm) of the first color plate cylinder. M _n + M
_{n + 1} ) (mm) divided by plate cylinder circumference C (mm), the remainder is plate cylinder circumference C
(mm) is subtracted to obtain a vertical register correction amount K _{n + 1} (mm) for initial registration of the n + 1th color plate cylinder so that the web path is an integral multiple of the plate cylinder circumference. Therefore, K _{n + 1/2} is half of the vertical register correction amount K _{n + 1} (mm) is (mm),
The register roll position is output as a preset value, the register roll is driven and the position is controlled via the printing press controller, and the vertical register initial preset is performed. Further, these plate cylinder circumference, mark position and preset set value are stored so as to be recalled.

Further, in this system, when the mark position M _n (mm) of at least one of the plate cylinders is known, after printing is started and the vertical register of each color is adjusted, n + The K position of the register roll of the first color is detected by the detector.
_It is detected as _{n +} 1/2 (mm), and K _{n + 1} (m
m) is transmitted to the presetting device through the control device, and this value is input to L _f (mm), L _c (mm), M _n (mm) and C
From (mm), the mark position M _{n + 1} (mm) = C − {(L _f + L _c + K _{n + 1} −
M _n )% C} is calculated. This calculation is based on the fact that the web path from the mark position of the nth color plate cylinder to the mark position of the (n + 1) th color plate cylinder is an integer multiple of the plate cylinder circumference length when the vertical registration is correct. A vertical register correction amount K _{n + 1} (mm) derived from the detected value of the position is added to obtain n in advance.
A Uebupasu obtained by subtracting the mark position color plate cylinder _{M n (mm) (L f} + L c + K n + 1 -M n) (mm) of the plate cylinder circumference C (m
By subtracting the remainder divided by m) from the plate cylinder circumference C (mm), the mark position M _{n + 1} (m
m) is required. Similarly, all the mark positions of the other remaining plate cylinders are obtained, and the mark positions of these plate cylinders can be stored in a recallable manner.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, U ₁ , U ₂ , and U ₃ are printing units, which constitute a printing unit of a gravure printing machine capable of increasing or decreasing the number of colors depending on the number of units. Here, in the case of a three-color gravure printing machine, It illustrates and demonstrates. Plate cylinders 11, 21, and 31 are attached to the lower center of the printing unit, respectively, and are connected to a plate cylinder drive unit (not shown). The impression cylinders 12, 22, 32 are opposed to the plate cylinders so as to be capable of being pressed and disengaged to form a pair, and a large number of guide rollers 1 are formed to form a suitably bypassed web path between the pairs.
3, 24 ... Are arranged. In the illustrated case, the plate cylinder is driven in the clockwise direction, and the web W flows between the printing units while being guided by a large number of guide rollers while passing between the plate cylinder and the impression cylinder from left to right.

The plate cylinders 11, 21, and 31 are connected to a plate cylinder drive unit (not shown) by a structure capable of maintaining the same rotational phase of each plate cylinder, for example, a shaftless sleeve type plate cylinder. In the above, a key groove is formed in a taper hole formed in an end portion, and a key is embedded in a taper cone on the plate cylinder drive section side so that they are fitted together. In this case, the keys on the taper cone on the plate cylinder drive section side of each printing unit are adjusted so as to have the same rotational phase, and then assembled. Also, when the plate cylinder automatic changer is equipped, the plate cylinder can be mounted by aligning the key groove on the taper hole of the plate cylinder waiting for replacement with the key on the taper cone on the plate cylinder drive side. Easily done.

Numerals 25 and 35 are register rolls, which are arranged in the middle of the web path between the printing units so that the web paths are substantially parallel to the front and rear guide rolls. The register rolls 25 and 35 are provided with a drive unit (not shown) capable of moving the position in the parallel direction, and the movement position is provided with a detector (not shown) in the drive unit so that the position can be constantly detected by a digital amount. The printing press controller 41 is provided with driving and position control of the register rolls 25 and 35. The drive unit (not shown) uses, for example, a mechanism in which a screw screw screwed to a bearing portion of a register roll is rotated by a motor to rotate forward and backward, and a position detector is attached with a potentiometer, a rotary encoder, or the like. ing. A preset device 42 is equipped with a control unit for a vertical register initial preset system, and mutually communicates the vertical register initial preset value and the vertical register (position of register roll) current value with the printing press controller 41. Is performed.

Next, the contents of actual control in the vertical registration initial preset system of the gravure printing machine having such a configuration will be described with reference to the flow shown in FIG. For convenience of explanation, the printing unit U in FIG.
Only the initial preset control of the position of the register roll 25 for adjusting the vertical register with respect to the _second plate cylinder 21 will be described, and the same is performed for each of the subsequent printing units, and a description thereof will be omitted. That is, when the web printed with the pattern by the plate cylinder 11 in the printing unit U ₁ is guided by a large number of guide rollers 13, 24, ... A case will be representatively described in which initial preset control is performed on the position of the register roll 25 disposed midway in order to adjust the web path length between the units so that the rotational phase of the pattern of the plate cylinder 21 is synchronized.

In step 1, a preset device 42 equipped in the printing machine is provided with a numerical value of the fixed path length L _f (mm) and an arithmetic expression for obtaining the path length L _c (mm) which changes depending on the plate cylinder diameter.
Enter in advance. Here, the plate cylinder 1 of the printing unit U ₁
1 and print from the pressing contact of the impression cylinder 12 units U ₂ of the plate cylinder 2
The web path length between the unit 1 and the pressing contact point of the impression cylinder 22 is divided into a fixed path length L _f (mm) and a path length L _c (mm) that changes depending on the plate cylinder diameter, and Is defined as That is, the fixed path length L _f (mm) is printed through the register roll 25 set at the reference position 0 (origin) on the way from the contact with the web on the guide roller 13 immediately after the impression cylinder 12 of the printing unit U _1. The fixed web path length up to the point of contact with the web on the guide roller 24 just before the impression cylinder 22 of the unit U ₂ is calculated from the roller diameter and position on the design drawing, and the tape etc. is actually printed on the printing machine. A numerical value obtained by measuring along the web path is used. Path length L _c (mm) that changes depending on plate cylinder diameter
Is the path length from the pressing contact points of the plate cylinder 11 and the impression cylinder 12 in the printing unit U ₁ to the contact point with the web on the guide roller 13 immediately after the impression cylinder 12, and immediately before the impression cylinder 22 of the printing unit U ₂ . From the contact point with the web on the guide roller 24, the plate cylinder 2
1 and the path length to the pressing contact point of the impression cylinder 22 are combined, and in a normal gravure printing machine in which the positional relationship between the plate cylinder / impression cylinder and the front and rear guide rollers does not change in each printing unit, It is the same as the web path from the contact point with the web on the guide roller immediately before the impression cylinder to the contact point with the web on the guide roller immediately after the impression cylinder through the press contact point of the plate cylinder and the impression cylinder. In the mechanism of a normal printing unit that presses and separates the impression cylinder against the plate cylinder held and fixed to the plate cylinder, the path length that changes as the position of the impression cylinder moves when pressing against the plate cylinder whose diameter changes Equivalent to.
Therefore, the path length L _c (mm) that changes depending on the plate cylinder diameter
Is a calculation formula geometrically determined from the positional relationship between the impression cylinder and the front and rear guide rollers and their respective diameters with the plate cylinder circumference C (mm) as a parameter.

Therefore, in the actual work, the vertical register initial preset of the plate cylinder mounted on the gravure printing machine is executed. In step 2, the mark positions M ₁ and M ₂ of each plate cylinder are input to the preset device 42. The mark positions M ₁ and M ₂ are the normal rotation directions on the circumferential surface from the key groove of the mounting taper hole that is the reference of the rotation phase of the plate cylinder to the cross mark that is the reference of the pattern made on the plate cylinder. Is the distance to, and the measured value measured outside the machine in advance for each plate cylinder is used. The mark position is easily measured by hand using a measure, and semi-automated measurement is performed by placing the plate cylinder on a rotatable pedestal and rotating it from the reference position to the mark position. The rotation of the long roller is converted into counts. Next, when the preset system is started in step 3, the arithmetic unit of the preset device 42 executes the following equation.

Vertical register correction amount K ₂ (mm) = C-{(L _f +
_{L c -M 1 + M 2)} % C} where% is an operator for obtaining the remainder. By this calculation, each plate cylinder, when the register roll is at the reference position,
The L _f + L _c (mm) is a Uebupasu between the impression cylinder, the printing unit U ₁ of the plate cylinder 11 mark position M ₁ mark position M ₂ of the plate cylinder 21 (mm) was subtracted printing unit U ₂ (mm of ) Is added to obtain the web path from the mark position of the plate cylinder 11 of the printing unit U ₁ to the mark position of the plate cylinder 21 of the printing unit U ₂ (L _f + L _c −M ₁ + M ₂ ) (mm ) is subtracted from the plate cylinder circumference the remainder obtained by dividing the plate cylinder circumference C (mm) C (mm) , the plate cylinder 21 of the printing unit U ₂ to an integral multiple of the plate cylinder circumferential length Uebupasu A vertical register correction amount K ₂ (mm) for initial registration is obtained. Step 4, presetting device 1/2 of vertical register correction amount K ₂ (mm) as the register roller 25 the position of the preset set value K _2/2 (mm) 42
From the printer control device 41. In step 5,
Preset setting from the printing press control device 41 to the drive portion of the register roll 25 value K _2/2 (mm) is output as a preset position of the register rolls 25, vertical register initial preset position control of the register roller 25 is performed.

[0022] In step 6, in this way the preset system executed, the plate cylinder circumference C (mm), the mark position M _1, M ₂ and the computation result of the preset setting of the register roll position value K _2/2 ( mm), the preset device 42
In step 7, read the preset setting value when reusing the same plate cylinder in the repeat order, by directly storing it in the storage section of the memory or storing it in the magnetic storage medium.
Steps 4 and below are repeatedly executed. In this case,
Even for other multi-color gravure printing machines with different web passes, the web pass is input to the preset device in advance, the mark position of the same plate cylinder is called, and step 3
The following operations are repeatedly executed.

Further, the preset system of the present invention is
If the mark positions of at least one plate cylinder are known, it is possible to start printing, register them, and after the vertical registers of each color match, calculate the mark positions of the remaining plate cylinders backwards. This will be described with reference to the flowchart shown in FIG. Again for convenience of explanation, has been found the mark position M ₁ of the plate cylinder 11 of the printing unit U ₁ in advance, it will be described for obtaining the mark position M ₂ of the plate cylinder 21 of the printing unit U _2. In Step 8, the position of the register roll 25 in a state in which start to vertical register is suits the printing, digital quantity K _2/2 by a detector provided to the drive unit (m
m) and doubled this detected value K ₂ (mm)
Is transmitted as a vertical register correction amount to the preset device 42 via the printing press control device 41. In step 9, the calculation of the following equation is executed.

M ₂ (mm) = C − {(L _f + L _c + K ₂ −M ₁ )% C} By this calculation, printing is performed from the mark position of the plate cylinder 11 of the printing unit U _{1 in} a state in which the vertical register is aligned. Since the web path to the mark position on the plate cylinder 21 of the unit U ₂ is an integral multiple of the plate cylinder circumference, the vertical register correction amount K ₂ (mm) derived from the detected value of the register roll position at this time is added. The mark position M of the plate cylinder 11 of the printing unit U ₁ which is known in advance
(L _f + L _c + K ₂ −M of the web path obtained by subtracting ₁ (mm)
_n ) (mm) divided by the plate cylinder circumference C (mm), the remainder is the plate cylinder circumference C (m
By subtracting from m), the mark position M ₂ (mm) that has not been measured in advance on the plate cylinder 21 printed by the printing unit U ₂ is obtained. By storing this in memory as in step 6 in FIG. 2 described above, it is possible to read out at the time of the repeat order and execute the vertical register initial preset as in step 7.

[0025]

As described above, according to the vertical register initial preset system of the multi-color gravure printing machine of the present invention, each of the multi-color gravure printing machines for registering by moving the register roll position Adopting a structure in which the rotation phases connecting the plate cylinder and the plate cylinder drive unit are all kept the same, the reference of the rotation phase of the plate cylinder is applied to the preset device in which the web path between each plate cylinder and the impression cylinder is input in advance. Body key)
By inputting the mark position of each plate cylinder, which is the distance on the peripheral surface in the forward direction from the position of the pattern made from (to the cross mark) to the initial registration of each plate cylinder The required vertical register correction amount is obtained as a preset set value for each register roll position, is output to the printing press control unit, and the register roll drive and position control are executed to perform the initial preset of the vertical register. The mark position and the plate cylinder circumference can be stored in a recallable manner. Therefore, in the conventional initial registration device, the work of setting all the patterns of each plate cylinder in the same phase, which was necessary for the preparation for starting the preset system, becomes unnecessary, and automation, labor saving and shortening of the preparation time can be achieved. , The effect of the cooperation work with the plate cylinder automatic changing device is synergized. Further, since the preset data can be managed as the mark position peculiar to the plate cylinder, even when the same plate cylinder is used in another multi-color gravure printing machine having a different web path, the printing machine in which the web path is input in advance is used. It is possible to cause the presetting device equipped in the above to execute by calculating the mark position of the same plate cylinder as data from the storage medium and calculating it.

Further, in this system, when the mark position of at least one plate cylinder among the plate cylinders is known, the register roll position is detected after printing is started and the vertical register of each color is aligned. By transmitting the detected value to the preset device for calculation, the mark position of the plate cylinder can be back-calculated and obtained and can be stored so as to be recalled.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a three-color gravure printing machine showing an embodiment of a vertical registration initial preset system of a multi-color gravure printing machine of the present invention.

FIG. 2 is a flowchart showing an embodiment of a vertical register initial preset system of a multicolor gravure printing machine according to the present invention,
This is for obtaining the preset setting value of the register roll position.

FIG. 3 is a flowchart showing an embodiment of a vertical register initial preset system of a multicolor gravure printing machine according to the present invention,
This is the case where the plate cylinder mark position is calculated back.

[Explanation of symbols]

 11, 21, 31 plate cylinder 12, 22, 32 impression cylinder 13, 24 guide roller 25, 35 register roll 41 printing machine control device 42 preset device

Claims (2)

[Claims] 1. A plate cylinder mounted on a plurality of printing units, respective impression cylinders arranged facing each plate cylinder so as to be able to come into contact with and separate from each other, and a pair of each plate cylinder / impression cylinder. A large number of guide rollers arranged by forming respective web paths between them, and register rolls arranged by forming substantially parallel web paths between front and rear guide rolls in the middle of each web path, and these A drive unit for moving the position of each register roll in the parallel direction, a detector for detecting the position of each register roll, a printing press control device for driving and controlling the position of each register roll, In a vertical registration initial preset system of a multicolor gravure printing machine, which comprises an input unit for performing initial registration at the start, a presetting device having a calculation unit and a storage unit, the rotational phase of each plate cylinder The same A plate cylinder drive unit that holds, mounts and connects the plate cylinders to each other is provided, and the web path when the register roll between each plate cylinder and the impression cylinder is in the reference position is fixed path length L _f (m
m) and an arithmetic expression for obtaining a path length L _c (mm) that changes depending on the plate cylinder diameter, and the preset device is input in advance by dividing the circumference in the forward rotation direction from the reference phase of each plate cylinder. Input the mark positions M ₁ , M ₂ , ... M _n , ... (mm) and the plate cylinder circumference C (mm) on the surface, and set the vertical register correction amount K _{n + 1} (mm) = C-{(L _f + L _c −M _n
+ M _{n + 1} )% C} (where% is an operator for finding the remainder), and the vertical register correction amount K _{n +} for initial registration of the plate cylinder of the n + 1th color is performed. ₁ (mm) is calculated and K _{n +} 1/2 (m
(m) is output as a preset value of the register roll position to drive the register roll and control the position via the printing press control device, and the plate cylinder circumference, mark position and preset set value can be recalled. An initial preset system for vertical registration of a multicolor gravure printing machine characterized by storing. 2. A register for the (n + 1) th color after starting printing and aligning the vertical register of each color when the mark position M _n (mm) of at least one of the plate cylinders is known. detected as _{K n + 1/2 (mm} ) by the detector the position of the roll, is transmitted to the preset apparatus through a printing press control device K _{n + 1} (mm) from the detected value, enter the value L _f
(mm), L _c (mm), C (mm) and M _n (mm), the mark position M _{n + 1} (mm) = C − {(L _f + L _c + K _{n + 1} −
M _n )% C} is calculated to obtain the mark position M _{n + 1} (mm) of the plate cylinder on which the n + 1th color is printed, and all the mark positions of the remaining plate cylinders are calculated in the same manner. 2. The vertical registration initial preset system for a multi-color gravure printing machine according to claim 1, wherein the mark positions of these plate cylinders can be retrieved and stored so as to be recalled.