JP5736179B2 - Rotary printing press and plate cylinder initial position adjustment method - Google Patents

Description

The present invention relates to you and plate cylinder initial position adjustment method rotary printing press.

  A rotary printing machine that performs multicolor printing is provided with a plurality of printing units. In such a rotary printing press, the operation of aligning the printing position of each printing unit, that is, the initial position of the plate cylinder so as not to cause the printing position deviation (color misregistration) of each printing unit (plate cylinder initial position adjustment, registration) ) Is performed.

In conventional plate cylinder initial position adjustment, a method of using a mechanical pointer indicating one point of the plate cylinder surface or a method of using a laser pointer projected on the plate cylinder surface is known as a reference position indicating device.
In any method, a reference mark (register mark or the like) serving as a reference position of a printed pattern is engraved on the surface of the plate cylinder, and the reference mark and the indicated position of the pointing device (pointer or laser pointer) described above are located. The matched state is set as the initial position of the plate cylinder.

By the way, the plate cylinder of the printing unit is replaceable. That is, the plate cylinder is detachably supported on the rotating shaft of the printing unit. A keyway fitting or the like is formed between the plate cylinder and the rotation shaft, and the plate cylinder and the rotation shaft are maintained at a predetermined angular position.
When the plate cylinder is exchanged, the above-mentioned plate cylinder initial position adjustment is essential. That is, the angle position between the keyway of the plate cylinder and the reference mark on the surface is different for each plate cylinder. When a new plate cylinder is mounted on the printing unit, the rotation shaft is operated, and the reference mark is the same as described above. It is necessary to adjust so as to coincide with the indication position of the indication device.

As described above, the plate cylinder initial position adjustment is necessary every time the plate cylinder is replaced. However, in the conventional plate cylinder initial position adjustment, the pointing device is attached to the printing unit every time adjustment work is performed, and then removed after the work. For this reason, since the adjustment work including attachment / detachment of the pointing device is frequently repeated, the work efficiency is low, and it is necessary to store the pointing device separately except during the work.
For such problems, record the angle of the rotation axis in the completed state for each plate cylinder, and call the appropriate rotation axis angle when using the plate cylinder. A technique that enables the cylinder initial position adjustment to be omitted has been proposed by the present applicant (see Patent Document 1).

On the other hand, in a multi-color printing machine or the like, in general, in order to attach and detach the printing cylinder to the printing machine, the printing cylinder is clamped in the axial direction from both sides by using a tapered shaft (sidelet) or the like as the rotation axis of the printing machine. ) Has been made. At this time, the surface length of the plate cylinder (the length of the plate cylinder in the axial direction) varies, and the axial position changes depending on the clamping state, so the axial position of the plate cylinder mounted on the printing machine is May not be in the same position.
In order to solve such a problem, an initial registration device has been proposed in which a movement amount is calculated and adjusted for an axial position (see Patent Document 2).

Japanese Patent No. 3934968 JP 2009-101621 A

In Patent Document 1, the initial position of the plate cylinder of the rotary shaft in the printing unit is recorded for each plate cylinder and reused so that the adjustment of the initial position of the plate cylinder can be omitted.
However, for the initial position adjustment of the plate cylinder, a conventional pointing device is used, and it is necessary to attach / detach or store it.
In addition, although the conventional pointing device performs angular positioning in the rotation direction with respect to the reference mark on the surface of the plate cylinder, it does not support position adjustment in the rotation axis direction of the plate cylinder.
According to Patent Document 2 described above, position adjustment in the rotation axis direction can be performed. However, Patent Document 1 does not consider position adjustment in the rotation axis direction such as handling of the pointing device. Therefore, it is necessary to separately perform angular positioning in the rotational direction and position adjustment in the rotational axis direction.

An object of the present invention is to provide a rotary press contact and the plate cylinder initial position adjusting method capable of performing even the position adjustment of the rotation axis direction of the plate cylinder is possible to work even more simplified.

A rotary printing press according to the present invention includes a frame, a side plate rotatably supported by the frame, and a plate cylinder that is attached to the side plate so that the axial position thereof can be adjusted and a reference mark is formed on the surface. A rotary printing press, a plate cylinder drive motor having a rotary encoder capable of detecting the rotation angle of the plate cylinder, a side drive motor having an encoder capable of detecting an axial position of the plate cylinder, and supported by the frame A rail that extends along the axial direction of the side lever, a laser pointer that is supported by the rail and that can move in the longitudinal direction of the rail, and that can point to a point on the surface of the plate cylinder, and supports the laser pointer A holder movably provided along the rail, a linear scale capable of detecting an axial position of the holder, the rail or the holder And a servo motor that moves the laser pointer to the detection position and retracts to the end of the rail during the printing operation, and the light spot of the laser pointer matches the reference mark of the plate cylinder With the plate cylinder adjusted to the initial position, the rotation angle of the plate cylinder detected by the rotary encoder of the plate cylinder drive motor, the axial position of the plate cylinder detected by the encoder of the side drive motor, and the comprises a storage device linear scale as the registration information of the axial position of the holder which is detected to memorize, and a control device for controlling the position of the plate cylinder and the laser pointer, the control device, wherein Check whether the plate cylinder mounted on the side tray is registered in the storage device, and if the plate cylinder to be checked is already registered, The registration information corresponding to the cylinder is read, and based on the read registration information, the plate cylinder drive motor is operated to rotate the plate cylinder with the target rotation angle of the plate cylinder, and the axial position of the plate cylinder the plate cylinder by actuating the Saidore drive motor to the target axially move to Rukoto and adjust the position of the plate cylinder, when the plate cylinder to be confirmed is not registered, the servo motor The laser pointer is moved to an intermediate position in the adjustment range of the axial position of the side shift, and the plate cylinder driving motor is operated to adjust the rotation angle of the plate cylinder. And adjusting the axial position of the plate cylinder by operating the side drive motor to adjust the plate cylinder to the initial position and detecting the current rotation angle and axial position of the plate cylinder Memorize in the storage device, During the printing operation, the servo motor is operated to control to retract the laser pointer to the end of the rail.

The plate cylinder initial position adjusting method of the present invention includes a frame, a side plate rotatably supported on the frame, a plate cylinder mounted on the side plate so as to be axially position adjustable and having a reference mark formed on the surface, A plate cylinder initial position adjusting method for a rotary printing press comprising: a plate cylinder drive motor having a rotary encoder capable of detecting a rotation angle of the plate cylinder; and an encoder capable of detecting an axial position of the plate cylinder. A lateral drive motor having a rail supported by the frame and extending along the axial direction of the lateral; a rail supported by the rail and movable in the longitudinal direction of the rail; and a point on the surface of the plate cylinder can be indicated. A laser pointer; a holder that supports the laser pointer and is movable along the rail; and a linear scale that can detect the axial position of the holder. A servo motor that is provided on the rail or the holder and moves to the detection position of the laser pointer and retracts to the end of the rail during a printing operation, the light spot of the laser pointer, and the plate The rotation angle of the plate cylinder detected by the rotary encoder of the plate cylinder drive motor in the state where the plate cylinder is adjusted to the initial position where the reference mark of the cylinder coincides, and the encoder of the side drive motor detected the axial position of the plate cylinder, and a storage device for memorize the axial position of the holder in which the linear scale is detected by the registration information, and a control device for controlling the position of the plate cylinder and the laser pointer, the Based on the control by the control device, check whether the plate cylinder attached to the side tray is registered in the storage device. When the plate cylinder to be confirmed is already registered, the registration information corresponding to the plate cylinder is read from the storage device, and the plate cylinder driving motor is set with the rotation angle of the plate cylinder as a target based on the read registration information. rotating the plate cylinder by actuating the said plate to the plate cylinder the axial position by operating the Saidore drive motor to the target cylinder axially move to Rukoto, the positional adjustment of the plate cylinder If the plate cylinder to be confirmed is not registered, the servo motor is operated to move the laser pointer to a preset temporary registration position and move to an intermediate position in the adjustment range of the axial position of the side shift The plate cylinder drive motor is operated to adjust the rotation angle of the plate cylinder, and the side drive motor is operated to adjust the axial position of the plate cylinder, thereby bringing the plate cylinder into the initial position. Adjust current version The rotation angle and axial position of the cylinder are detected and stored in a storage device, and during the printing operation, the servo motor is operated to retract the laser pointer to the end of the rail.

In the present invention, since the rail and the laser pointer are always installed, the problem of attachment / detachment and storage in the conventional pointing device can be solved.
Also, since the rail is formed along the rotation axis direction and the laser pointer is movable along the rail in the rotation axis direction, the position of the plate cylinder in the rotation axis direction can be determined by measuring the rail longitudinal position of the laser pointer. Can be measured.
In these invention, movement of the laser pointer, the rotation of the plate cylinder, the position adjustment of the axial direction of the plate cylinder is being automated to operate the motor or the like by an instruction from the control device, manually by the operator by reference It is also possible to do this . Also, the operator may visually confirm the coincidence between the reference mark on the plate cylinder surface and the light spot on the plate cylinder surface projected by the laser pointer, and the image taken by the camera is recognized by the control device. You may automate so that it may be in agreement.

In such present invention, it is possible to appropriately adjust the axial position of the plate cylinder by Saidore drive motor as an axial position adjusting device, adjust the laser pointer with respect to the plate cylinder of a suitably adjusted state, that state By detecting the position in the axial direction with an encoder of a side drive motor as an axial position detection device , this axial position can be used for the next adjustment.

In the present invention, an appropriate axial position for each plate cylinder detected by the encoder of the side drive motor can be stored in the storage device, and based on the axial position for each plate cylinder read from the storage device. The plate cylinder can be set to an appropriate axial position by adjusting the axial position of the plate cylinder by operating the side drive motor .
Therefore, with the axial position of the plate cylinder can be appropriately adjusted by Saidore drive motor, properly align the laser pointer with respect to the plate cylinder of the adjusted state, the axial position of its state encoder Saidore drive motor By detecting this, this axial position can be used in the next adjustment.

It is a schematic side view which shows one Embodiment of this invention. It is a perspective view which shows the printing unit of the said embodiment. It is a schematic diagram which shows the reference mark of the said embodiment. It is a block diagram which shows the control system of the said embodiment. It is a flowchart which shows the initial position adjustment process of the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a rotary printing press 1 according to this embodiment. The rotary printing machine 1 is a five-color straight gravure rotary printing machine, and includes five printing units 2 to 6 arranged in series.
A printing paper (web) W is passed through the rotary printing press 1. The web W is passed through the five printing units 2 to 6 described above, and overprinting of five colors is performed.

In order to operate such a web W, a paper feeding unit 7 and an infeed unit 8 for supplying the web W are arranged on the upstream side of the printing unit 2. Further, on the downstream side of the printing unit 6, an outfeed unit 9 and a winding unit 10 for winding the printed web W are arranged.
Further, a control unit 11 is connected to the rotary printing press 1, and the entire rotary printing press 1 including the printing units 2 to 6, the paper feeding unit 7, the infeed unit 8, the outfeed unit 9 and the winding unit 10 described above. Control is performed.

  The printing units 2 to 6 are each provided with a plate cylinder 22, an impression cylinder 20, a plurality of guide rollers 21 and the like. Each plate cylinder 22 is rotationally driven independently by each plate cylinder drive motor 23.

In FIG. 2, the printing units 2 to 6 have a pair of frames 31 and 32 on both sides, and the plate cylinder 22 and other rollers described above are installed between the frames 31 and 32.
The plate cylinder 22 is clamped by a pair of side trays 24 on both sides and attached to the printing units 2 to 6, and can be detached from the printing units 2 to 6 by retreating the side tray 24 to release the clamping.

The side tray 24 corresponds to the rotating shaft of the printing units 2 to 6 and is rotatably supported by the frames 31 and 32, respectively. The plate cylinder driving motor 23 described above drives the side cylinder 24 to rotate the plate cylinder 22. Drive to rotate.
The plate cylinder drive motor 23 is a servo motor, and includes a rotary encoder that detects a rotation angle of a control target. Here, the plate cylinder drive motor 23 is used as a function of detecting the rotation angle of the plate cylinder 22 as a rotation detection apparatus of the present invention while rotating the plate cylinder 22 as a rotation drive apparatus in the present invention (FIG. 4). reference).
In the present invention, a rotation detection device may be installed separately from the plate cylinder drive motor 23 which is a rotation drive device. The plate cylinder 22 can be appropriately rotated manually by an operator, in addition to being driven by the plate cylinder drive motor 23.

The frames 31 and 32 are provided with a side drive motor 34 for moving the position of the side 24 in the axial direction. The side drive motor 34 holds and releases the plate cylinder 22 as described above, and also sets the position of the side 24 in the axial direction. By changing the position, the axial position of the plate cylinder 22 can be adjusted.
The side drive motor 34 has an encoder for detecting the position in the movement direction, and can detect the movement position of the side shift 24. Here, the side drive motor 34 adjusts the axial position of the plate cylinder 22 as an axial position adjustment device in the present invention, and detects the axial position of the plate cylinder 22 as an axial position detection device of the present invention. (See FIG. 4).
In the present invention, an axial position detecting device may be installed separately from the side drive motor 34 which is an axial position adjusting device. In addition to the driving by the side driving motor 34, the side 24 can be appropriately advanced and retracted by the operator manually operating the handle.

In the printing units 2 to 6, a plate cylinder reference position indicating device 40 according to the present invention is installed in order to execute the plate cylinder initial position adjusting method according to the present invention.
A rail 41 extending in the direction of the rotation axis is bridged between the frames 31 and 32. The rail 41 has a prismatic shape, and a linear scale 42 is installed therein as pointer position detecting means.
A holder 43 is mounted on the rail 41, and the holder 43 is movable along the rail 41, and the axial position of the holder 43 (the position in the direction along the rotation axis of the plate cylinder 22) is detected by the linear scale 42. Is possible.

A laser pointer 44 is supported on the holder 43. A laser pointer 44 (hereinafter sometimes simply referred to as a pointer) irradiates a laser beam perpendicular to the surface of the plate cylinder 22 toward the plate cylinder 22, and designates one point of the cylinder surface on the surface of the plate cylinder 22. A point P (see FIG. 3) is generated.
Note that the end of the rail 41 serves as a retracted position of the laser pointer 44 and is retracted so as not to affect the operation of the operator on the plate cylinder 22 except when the initial position adjustment is performed.
In the printing units 2 to 6, the respective linear scales 42 are positioned with high accuracy with respect to the frames 31 and 32, and the axial position of the laser pointer 44 can be grasped with high accuracy from the detected values.
The position adjustment and retraction of the laser pointer 44 are performed by the operator manually releasing the clamp of the holder 43 with respect to the rail 41, moving it to an appropriate position of the rail 41, and clamping again. However, a servo motor or the like may be installed on the holder 43 or the rail 41 and automatic control may be performed by the control unit 11.

In FIG. 3, a “+”-shaped reference mark M is engraved on the surface of the plate cylinder 22. Although details will be described later, in the initial adjustment of the plate cylinder, the initial rotation angle of the plate cylinder 22 is adjusted R so that the reference mark M and the light spot P of the laser pointer 44 coincide with each other, and the axial position of the plate cylinder 22 is adjusted. Adjustment A is performed.
In the plurality of printing units 2 to 6, if the position of the light spot P of the laser pointer 44 is set to a fixed position, the state of the drive system of the plate cylinder 22 is made by matching the reference mark M to the light spot P. Regardless, the surface of the plate cylinder 22 can be set at a fixed position.
Note that the coincidence between the reference mark M and the light spot P of the laser pointer 44 may be confirmed visually by the operator. For example, when the adjustment R of the initial rotation angle is performed, the operator manually operates the plate cylinder 22 while observing the deviation between the reference mark M and the light spot P (the circumferential direction of the plate cylinder 22 and the vertical direction in FIG. 3). Rotate with a motor. Further, when the adjustment A of the axial position is performed, the operator manually operates the motor 24 or the motor while watching the deviation between the reference mark M and the light spot P (the axial direction of the plate cylinder 22 and the left-right direction in FIG. 3). Move with etc.
Note that a camera for photographing the surface of the plate cylinder 22 is installed, an image including the reference mark M and the light spot P is photographed, and this image is taken into the control unit 11 to perform image recognition. It may be automated so as to confirm whether or not it matches the light spot P.

In FIG. 4, a control unit 11 of the rotary printing press 1 has an existing configuration for controlling the operation of the rotary printing press 1 and also includes a control device 12 for adjusting the initial position of the plate cylinder and a configuration based on the present invention. A storage device 13 is provided for recording registration information for plate cylinder initial position adjustment.
In the printing units 2 to 6, the plate cylinder drive motor 23, the side drive motor 34, and the linear scale 42 are installed as described above. As described above, the plate cylinder drive motor 23 serves as the rotational drive device of the present invention and the rotational position detection device of the present invention, and the side drive motor 34 is the axial position adjustment device of the present invention and the axial position of the present invention. It also serves as a detection device. The linear scale 42 is the axial position detection device of the present invention, and is used to detect the axial position of the laser pointer 44.

The operation in this embodiment will be described.
When performing new printing in the rotary printing press 1, the plate cylinders 22 of the printing units 2 to 6 are replaced, and the printing cylinder initial position adjusting process is performed in each of the printing units 2 to 6 before printing. The initial positions (rotation angle and axial position) of the plate cylinder 22 are aligned in the printing units 2 to 6.

  As shown in FIG. 5, in the plate cylinder initial position adjustment process, first, the control device 12 performs individual confirmation of the plate cylinder 22 mounted on the printing units 2 to 6, and the mounted plate cylinder 22 is stored in the storage device 13. Is registered (process S31). Specifically, the operator may perform an operation of inputting the identification code of the plate cylinder 22 to the control device 12, or the optical or electromagnetic in which the identification code displayed on the plate cylinder 22 is installed in the printing units 2-6. It may be read by a typical reading means.

When the current plate cylinder 22 is not registered (processing S32), the laser pointer 44 is moved to the detection position (processing S33). In moving to the detection position, the laser pointer 44 is moved to a preset temporary registration position (an approximate position in the axial direction where the reference mark M is imprinted on the surface of the plate cylinder 22).
In the detection position, the axial position of the laser pointer 44 detected by the linear scale 42 is referred to, and the axial position of the laser pointer 44 is adjusted to the same value in each printing unit 2 to 6. As a result, in each of the printing units 2 to 6, the laser pointer 44 is set at a certain axial position with reference to the frames 31 and 32.

Subsequently, laser light is emitted from the laser pointer 44 toward the plate cylinder 22 to generate a light spot P on the surface of the plate cylinder 22, and the light spot P and the reference mark M on the surface of the plate cylinder 22 coincide. Adjustment is performed as described above (processing S34).
Specifically, the plate cylinder 22 is rotated by the plate cylinder drive motor 23 to adjust the initial rotation angle R (see FIG. 3) of the plate cylinder 22, and the axial position of the side shift 24 is changed by the side drive motor 34. Thus, the adjustment A (see FIG. 3) of the axial position of the plate cylinder 22 is performed.

If the servo motor 34 is outside the adjustment range of the axial position of the side 24 in the adjustment A of the axial position of the plate cylinder 22, the position of the laser pointer 44 is changed and the axial position of the plate cylinder 22 is changed again. Adjustment A is performed.
At this time, it is desirable to set the position of the new laser pointer 44 so as to be an intermediate position of the adjustment range of the side shift 24 in order to secure the adjustment allowance in other printing units. In either case, adjustment is made so that the axial positions of the laser pointers 44 in the printing units 2 to 6 are the same.

When the initial rotation angle adjustment R and the axial position adjustment A of the plate cylinder 22 are completed, the current plate with respect to the mechanical reference position of the printing unit (for example, the reference position of the rotation axis with respect to the frames 31 and 32, the reference position of the side shift). The rotational angle and axial position of the barrel 22 are detected and stored in the storage device 13 (processing S35).
Further, the current axial position of the laser pointer 44 is detected from the linear scale 42 and stored in the storage device 13 as the axial position of the laser pointer 44 in the subsequent printing unit. When the movement of the laser pointer 44 to the detection position (processing S33) and the storage to the retracted position (processing S36 described later) are automatically performed under the control of the control unit 11, the axial position of the laser pointer 44 is stored. It is desirable to keep it.

  When the above processing is completed, the laser pointer 44 is moved to the retracted position (processing S36), and the printing operation by the rotary printing press 1 is performed in this state (processing S37). By retracting the laser pointer 44 prior to the operation, it is possible to avoid an obstacle such as an operation of the operator with respect to the plate cylinder 22 and to avoid a collision with the laser pointer 44 and to store the laser pointer 44 safely. Is possible.

On the other hand, if the current initial position of the plate cylinder 22 has been registered in the process S32, the control device 12 reads the corresponding registration information from the storage device 13 (process S38), and based on this, the rotation angle of the plate cylinder 22 is read. And it is moved so as to change the axial position (processing S39), and the printing operation by the rotary printing press 1 is performed in this state (processing S37).
Therefore, when the information of the initial position regarding the plate cylinder 22 to be mounted is registered, the reference mark alignment operation by the above-described processing S33 to S36 can be omitted, and significant efficiency and time reduction can be expected.

Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.
For example, in the above-described embodiment, the plate cylinder 22 is sandwiched between the side plates 24, but other structures may be used as long as the plate cylinder 22 can be detachably mounted.
The rotary printing machine 1 is not limited to a gravure printing machine, and can be applied to other printing machines as long as it uses a plate cylinder 22. Further, the number of printing units 2 to 6 is not limited to five, and may be four or less or six or more.

The present invention relates to a contact and plate cylinder initial position adjusting method rotary printing press, can be used, such as especially a gravure rotary press for performing multi-color printing.

DESCRIPTION OF SYMBOLS 1 ... Rotary press 2-6 ... Printing unit 7 ... Paper feed part 8 ... Infeed part 9 ... Outfeed part 10 ... Winding-up part 11 ... Control unit 12 ... Control apparatus 13 ... Memory | storage device 20 ... Impression cylinder 21 ... Guide Roller 22 ... Plate cylinder 23 ... Plate cylinder drive motor 24 ... Side reel 31, 32 ... Frame 34 ... Side reel drive motor 40 ... Plate cylinder reference position indicating device 41 ... Rail 42 ... Linear scale 43 ... Holder 44 ... Laser pointer M ... Reference mark P ... Light spot W ... Web

Claims (2)

A rotary printing press comprising: a frame; a sidelet rotatably supported by the frame; and a plate cylinder that is mounted on the sidele so as to be axially adjustable and has a reference mark formed on a surface thereof.
A plate cylinder drive motor having a rotary encoder capable of detecting the rotation angle of the plate cylinder;
A side drive motor having an encoder capable of detecting the axial position of the plate cylinder;
A rail supported by the frame and extending along the axial direction of the sidelet;
A laser pointer supported by the rail and movable in the longitudinal direction of the rail and capable of indicating one point on the surface of the plate cylinder;
A holder that supports the laser pointer and is movable along the rail;
A linear scale capable of detecting the axial position of the holder;
A servo motor that is provided on the rail or the holder and moves to the detection position of the laser pointer and retracts to the end of the rail during printing operation;
The rotation angle of the plate cylinder detected by the rotary encoder of the plate cylinder drive motor in a state where the plate cylinder is adjusted to an initial position where the light spot of the laser pointer and the reference mark of the plate cylinder coincide with each other, the axial position of the plate cylinder of the encoder Saidore drive motor is detected, and a storage device for memorize the axial position of the holder in which the linear scale is detected as the registration information,
A control device for controlling the position of the plate cylinder and the laser pointer,
The control device checks whether the plate cylinder mounted on the side register is registered in the storage device,
When the plate cylinder to be confirmed is already registered, the registration information corresponding to the plate cylinder is read from the storage device, and the plate cylinder driving motor is set with the rotation angle of the plate cylinder as a target based on the read registration information. rotating the plate cylinder by actuating the said plate to the plate cylinder the axial position by operating the Saidore drive motor to the target cylinder axially move to Rukoto, the positional adjustment of the plate cylinder Done
When the plate cylinder to be confirmed is not registered, the servo motor is operated to move the laser pointer to a temporary registration position set in advance and move to an intermediate position in the adjustment range of the axial position of the side shift, The plate cylinder drive motor is operated to adjust the rotation angle of the plate cylinder, and the side drive motor is operated to adjust the axial position of the plate cylinder, thereby adjusting the plate cylinder to the initial position. , Detecting the current rotation angle and axial position of the plate cylinder and storing them in the storage device,
In a printing operation, the rotary printing press is configured to perform control to operate the servo motor to retract the laser pointer to the end of the rail. Plate cylinder initial position of a rotary printing press comprising a frame, a side plate rotatably supported by the frame, and a plate cylinder that is mounted on the side plate so as to be axially adjustable and has a reference mark formed on the surface. An adjustment method,
A plate cylinder drive motor having a rotary encoder capable of detecting the rotation angle of the plate cylinder;
A side drive motor having an encoder capable of detecting the axial position of the plate cylinder;
A rail supported by the frame and extending along the axial direction of the sidelet;
A laser pointer supported by the rail and movable in the longitudinal direction of the rail and capable of indicating one point on the surface of the plate cylinder;
A holder that supports the laser pointer and is movable along the rail;
A linear scale capable of detecting the axial position of the holder;
A servo motor that is provided on the rail or the holder and moves to the detection position of the laser pointer and retracts to the end of the rail during printing operation;
The rotation angle of the plate cylinder detected by the rotary encoder of the plate cylinder drive motor in a state where the plate cylinder is adjusted to an initial position where the light spot of the laser pointer and the reference mark of the plate cylinder coincide with each other, the axial position of the plate cylinder of the encoder Saidore drive motor is detected, and a storage device for memorize the axial position of the holder in which the linear scale is detected as the registration information,
A controller for controlling the position of the plate cylinder and the laser pointer; and
Based on the control by the control device, confirm whether the plate cylinder mounted on the side register is registered in the storage device,
When the plate cylinder to be confirmed is already registered, the registration information corresponding to the plate cylinder is read from the storage device, and the plate cylinder driving motor is set with the rotation angle of the plate cylinder as a target based on the read registration information. rotating the plate cylinder by actuating the said plate to the plate cylinder the axial position by operating the Saidore drive motor to the target cylinder axially move to Rukoto, the positional adjustment of the plate cylinder Done
When the plate cylinder to be confirmed is not registered, the servo motor is operated to move the laser pointer to a temporary registration position set in advance and move to an intermediate position in the adjustment range of the axial position of the side shift, The plate cylinder drive motor is operated to adjust the rotation angle of the plate cylinder, and the side drive motor is operated to adjust the axial position of the plate cylinder, thereby adjusting the plate cylinder to the initial position. , Detecting the current rotation angle and axial position of the plate cylinder and storing them in the storage device,
A printing cylinder initial position adjusting method, wherein the servo motor is operated to retract the laser pointer to an end of the rail during a printing operation.

Images