JP7209350B2 - Plate cylinder phase difference measuring device and plate cylinder phase difference measuring method - Google Patents

Description

The present invention relates to a plate cylinder phase difference measuring apparatus and a plate cylinder phase difference measuring method.

In a web printing apparatus that performs multicolor printing, plate cylinders rotatably supported by printing units that perform printing of each color are aligned (hereinafter referred to as registration) with the web, and the outer circumferences of the respective plate cylinders are aligned. The ink adhering to the surface is sequentially transferred to the web for printing.

The initial registration when the plate cylinders are attached to the printing unit takes into consideration the length between each plate cylinder, the circumference of the plate cylinder, the elongation of the web, etc., and the plate cylinder supported by the printing unit is This is done by setting a predetermined rotational position (angle). The rotation position of the plate cylinder is set by rotating the plate cylinder so that the reference marks such as crop marks and colored control marks, which are the reference positions of the printing pattern formed on the outer peripheral surface of the plate cylinder, are at predetermined rotation positions. , by changing the phase.

In general, a printing unit of a printing apparatus supports a cylindrical plate cylinder by inserting support shafts (plate cylinder shafts) into support holes formed at both ends in the central axis direction of the cylindrical plate cylinder. The angle between the support shaft and the plate cylinder is adjusted by fitting the key of the support shaft into the key groove formed in the support hole of the plate cylinder. The printing apparatus includes a control unit that controls the rotation of the plate cylinder, and recognizes the rotation angle of the support shaft by detecting the rotation position of a key formed on the support shaft, for example.

The printing unit is adjusted in advance so that the rotational position of the key is set as the origin, and the rotational position of the support shaft is detected by a rotary encoder attached to the support shaft. Therefore, by correcting the difference between the rotational position of the key groove into which the key is fitted and the rotational position of the reference mark marked on the printing cylinder (hereinafter referred to as the printing cylinder phase difference), Controls the rotational position of the mark.

However, the plate cylinder phase difference, which is the angle between the position of the keyway formed in the support hole of the plate cylinder and the position of the reference mark imprinted on the outer peripheral surface of the plate cylinder, differs from plate cylinder to plate cylinder. Therefore, it is necessary to measure the plate cylinder phase difference for each plate cylinder in order to rotate the plate cylinder attached to the printing apparatus and set the reference mark at a predetermined rotational position for registration.

To measure the phase difference of the plate cylinder, for example, with the plate cylinder attached to the printing unit, position alignment is performed using a pointer or the like so that the registration mark is at a predetermined position, and the rotational position of the key groove at that time is set to 0. , and the angle information of the plate cylinder is stored in a memory (Patent Document 1).

JP 2003-266645 A

In the printing apparatus of Patent Document 1, the plate cylinder phase difference is measured while the plate cylinder used for printing for the first time is attached to the printing unit. Therefore, the switching time, that is, the stop time of the printing apparatus when replacing the plate cylinder is long. resulting in lower production efficiency. In addition, each printing unit requires a device such as a pointer for aligning the rotational position of the fiducial mark.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is an object of the present invention to provide a plate cylinder phase difference measuring apparatus and a plate cylinder phase difference measuring method capable of shortening the stop time of a printing apparatus at the time of plate cylinder replacement by memorizing the information.

In order to achieve the above object, the plate cylinder phase difference measuring device according to the first aspect of the present invention includes:
a mounting table for mounting the plate cylinder in a rotatable state around the central axis;
rotation angle adjustment means for adjusting a reference mark, which is marked on the plate cylinder and indicates a reference position of a printing pattern, to a predetermined rotation position;
angle measuring means for measuring an angle between a rotational position of a key groove formed on the plate cylinder and positioning and fixing the plate cylinder to the printing unit and a rotational position of the reference mark;
The angle measuring means
an insertion portion inserted into a support hole formed at one end of the plate cylinder in the central axis direction;
a key portion formed in the insertion portion and fitted into the key groove;
and a goniometer for measuring the rotation angle of the key portion around the central axis.

Further, the rotation angle adjusting means is
irradiating a laser beam from vertically above the central axis of the plate cylinder mounted on the mounting table;
You can do it.

Further, the goniometer
capable of measuring a relative angle between the rotational position of the keyway and the rotational position of the fiducial mark;
You can do it.

A printing cylinder phase difference measuring method according to a second aspect of the present invention includes:
Place the plate cylinder in a rotatable state around the central axis,
adjusting the reference mark indicating the reference position of the printing pattern, which is marked on the plate cylinder, to a predetermined rotational position;
angle measuring means formed on the plate cylinder for measuring an angle between a rotational position of a key groove for positioning and fixing the plate cylinder to the printing unit and a rotational position of the reference mark; It is inserted into the support hole to be supported, and the angle between the rotation angle of the keyway and the rotation position of the reference mark is measured.

According to the present invention, the phase difference of the plate cylinder can be easily measured before the plate cylinder is attached to the printing unit. Therefore, it is possible to shorten the stoppage time of the printing apparatus when replacing the plate cylinder and improve the production efficiency. be.

1 is a front view of a plate cylinder phase difference measuring device according to an embodiment of the present invention; FIG. 1 is a side view of a plate cylinder phase difference measuring device according to an embodiment; FIG. FIG. 5 is a plan view of the plate cylinder showing a state in which rotation angle adjustment has been completed; It is a perspective view showing the configuration of the angle measuring means according to the embodiment. FIG. 4 is a cross-sectional view showing a plate cylinder and angle measuring means inserted into the plate cylinder; FIG. 4 is a conceptual diagram showing a state of measuring a plate cylinder phase difference;

Hereinafter, a plate cylinder phase difference measuring apparatus and a plate cylinder phase difference measuring method according to an embodiment of the present invention will be described with reference to the drawings.

A plate cylinder phase difference measuring apparatus 1 according to the present embodiment includes a mounting table 11, rotation angle adjusting means 12, and angle measuring means 13, as shown in FIGS.

The mounting table 11 is a base on which the plate cylinder 30 is mounted, and includes a base plate 11a and a holding block 11b. The base plate 11a is a rectangular plate-shaped member, and is arranged so that the main surface thereof extends in the vertical direction.

The holding block 11b holds the plate cylinder 30 mounted on the mounting table 11 so that the central axis of the plate cylinder 30 is horizontal. For example, as shown in FIG. 2, the holding block 11b is attached to the base plate 11a so that one side surface of the triangular prism-shaped member is in contact with the upper surface of the base plate 11a. are placed in

Thus, the holding block 11b can place the plate cylinder 30 on the opposing slope portions like a V block. Therefore, plate cylinders 30 with various diameters can be mounted on the mounting table 11 . Further, as shown in FIG. 1, by arranging a plurality of pairs of holding blocks 11b opposed to each other in the central axis direction of the plate cylinder 30 to be placed, the plate cylinder 30 can be placed more stably.

In the above example, the shape of the holding block 11b is a triangular prism, but it is not particularly limited as long as the plate cylinder 30 can be rotatably mounted thereon. For example, it may be a roller installed rotatably parallel to the mounting direction of the plate cylinder 30, or a positioning pin erected on the base plate 11a. When the plate cylinder 30 is supported by rollers installed on the upper surface of the base plate 11a instead of the holding block 11b, the plate cylinder 30 can be easily rotated.

The rotation angle adjusting means 12 rotates the plate cylinder 30 mounted on the mounting table 11 around the central axis of the plate cylinder 30, and a reference indicating the reference position of the printing pattern, which is marked on the outer peripheral surface of the plate cylinder 30, is rotated. It is a guide for adjusting the mark to a predetermined rotational position (angle). The rotation angle adjusting means 12 according to this embodiment is a laser irradiation device arranged above the holding block 11b.

The rotation angle adjusting means 12 irradiates a linear laser beam so as to pass through the intermediate positions of the pair of opposing holding blocks 11 b arranged on the mounting table 11 . Specifically, a straight line is marked on the base plate 11a, which is the intermediate position between the pair of holding blocks 11b. The irradiation angle of the laser beam and the like are adjusted in advance so that the straight line that serves as a reference coincides with the laser beam emitted from the rotation angle adjusting means 12 .

Therefore, it is possible to irradiate the laser beam right above the central axis of the plate cylinder 30 mounted on the mounting table 11 . As a result, as shown in FIG. 3, the plate cylinder 30 is rotated around the central axis so that the reference mark on the plate cylinder 30 overlaps the irradiated laser beam, and the reference mark is positioned at the top. Additionally, the rotation angle of the plate cylinder 30 can be adjusted.

The angle measuring means 13 is formed on the plate cylinder 30 and measures the plate cylinder phase difference which is the angle between the rotational position of the key groove 30a for positioning and fixing the plate cylinder 30 to the printing unit and the rotational position of the reference mark. , and includes an insertion portion 13a, a key portion 13b, and a goniometer 13c, as shown in FIG. Here, the rotational position of the keyway 30a is the rotational angle of the widthwise center of the keyway 30a.

The insertion portion 13a is a tapered portion formed at one end of the cylindrical angle measuring means 13. As shown in FIG. is inserted into a support hole for supporting the printing unit. A tapered portion 30b is formed in the support hole, and the inserted angle measuring means 13 and the plate cylinder 30 are fixed so as to have the same central axis.

The key portion 13b is a key formed in the tapered insertion portion 13a, and as shown in FIG. position relative to the plate cylinder 30.

The goniometer 13c is an angle measuring device arranged at the end of the angle measuring means 13 opposite to the insertion portion 13a, and indicates the inclination of the measuring position with respect to the vertical direction. The goniometer 13c is, for example, a general digital goniometer (Shinwa Measurement Co., Ltd., digital angle meter mini with magnet 76447), and the center of the key portion 13b, more specifically, the widthwise center of the key portion 13b is , and the measurement positions of the goniometer 13c.

Thereby, the rotation angle about the central axis of the key portion 13b, which is the measurement position of the angle measuring means 13, can be measured.

Next, a method for measuring the plate cylinder phase difference using the plate cylinder phase difference measuring apparatus 1 according to the present embodiment will be described.

First, the plate cylinder 30 to be measured for the plate cylinder phase difference is placed on the mounting table 11 of the plate cylinder phase difference measuring apparatus 1 . The plate cylinder 30 is mounted by the holding block 11b arranged on the mounting table 11 so that the center axis thereof is substantially horizontal.

Subsequently, as shown in FIGS. 1 and 2, a cylindrical vertex indicator level CL is installed on the outer peripheral surface of the plate cylinder 30 mounted on the mounting table 11 . Then, it is confirmed that the plate cylinder 30 is set horizontally by using the cylindrical vertex indicating level CL. If the plate cylinder 30 is not placed horizontally, adjusters 11c arranged at the four corners of the base plate 11a are used to adjust the angle of the mounting table 11 so that the plate cylinder 30 is placed horizontally. This makes it possible to measure the plate cylinder phase difference more accurately.

Subsequently, the power of the laser irradiation device of the rotation angle adjusting means 12 is turned on to irradiate the printing cylinder 30 with laser light. Since the laser beam from the rotation angle adjusting means 12 is adjusted in advance so that it irradiates the central axis of the plate cylinder 30 from vertically above, the laser beam irradiates the top of the plate cylinder 30 in a straight line.

The plate cylinder 30 is manually rotated so that the reference mark stamped on the outer peripheral surface of the plate cylinder 30 is superimposed on the linear laser beam. As a result, the plate cylinder 30 is positioned such that the reference mark is positioned vertically upward.

Subsequently, the angle measuring means 13 is inserted into a tapered portion 30b having a keyway 30a formed at one end of the plate cylinder 30. As shown in FIG. At this time, the angle measuring means 13 is inserted into the plate cylinder 30 at the rotational position where the key portion 13b, which is the measuring position of the angle measuring means 13, fits into the key groove 30a of the plate cylinder 30. As shown in FIG.

As shown in FIG. 6, the goniometer 13c of the angle measuring means 13 indicates the angle of the rotational position of the key portion 13b, which is the same as the rotational position of the key groove 30a. Therefore, by reading the angle indicated by the goniometer 13c, the plate cylinder phase difference of the plate cylinder 30, that is, the difference between the rotational position of the keyway 30a for positioning and fixing the plate cylinder 30 to the printing unit and the rotational position of the reference mark Angles can be measured.

When the plate cylinder 30 whose plate cylinder phase difference has been measured is attached to the printing unit, by inputting the measured plate cylinder phase difference to the control unit of the printing device, the control unit can detect the rotational position of the key and The plate cylinder 30 can be rotated and registered based on the input plate cylinder phase difference.

Further, combination information of the identification number of the plate cylinder 30 and the measured plate cylinder phase difference is stored in advance in the control unit of the printing apparatus, the storage device of the server to which the printing apparatus is connected via a network, or the like. As a result, even when the plate cylinder 30 is repeatedly used by being replaced, the switching operation can be performed efficiently.

As described above in detail, in the plate cylinder phase difference measuring device 1 and the plate cylinder phase difference measuring method using the same according to the present embodiment, the plate cylinder 30 can be easily measured before the plate cylinder 30 is attached to the printing unit. Since the phase difference can be measured, it is possible to shorten the stoppage time of the printing apparatus at the time of plate cylinder replacement and improve production efficiency.

Further, when measuring the plate cylinder phase difference with the plate cylinder 30 attached to the printing unit, it is necessary to attach a pointer or the like for setting the rotational position of the reference mark to each printing unit. That is, the reference for plate cylinder phase difference measurement differs for each printing unit. As a result, there is a risk that the printing positions will vary among the printing units. However, in the plate cylinder phase difference measuring apparatus 1 according to the present embodiment and the plate cylinder phase difference measuring method using the same, the plate cylinder phase difference is measured with a common reference for the plate cylinders 30 attached to the respective printing units. Therefore, it is possible to improve the registration accuracy of each printing unit.

Although the rotation angle adjustment means 12 according to the present embodiment is a laser irradiation device, it is not limited to this, and may be configured so that the reference mark of the plate cylinder 30 can be adjusted to a predetermined position.

Also, in the present embodiment, the reference mark is marked on the outer peripheral surface of the plate cylinder 30, but the present invention is not limited to this. For example, it may be marked on one end face in the central axis direction. In this case, the rotation angle adjusting means 12 may irradiate a laser beam in the vertical direction of the end surface on which the reference mark is marked, or otherwise guide the reference mark so that it is positioned vertically upward.

In the present embodiment, the rotation angle adjustment means 12 is used to adjust the rotational position of the reference mark vertically upward. may be adjusted to In this case, the phase difference of the plate cylinder can be measured using the goniometer 13c capable of measuring the relative angle between the rotational position of the keyway 30a and the rotational position of the reference mark.

1 plate cylinder phase difference measuring device 11 mounting table 11a base plate 11b holding block 11c adjuster 12 rotation angle adjusting means 13 angle measuring means 13a insertion part 13b key part 13c goniometer 30 plate cylinder 30a Key groove, 30b taper portion, CL cylindrical vertex indicator level

Claims (4)

a mounting table for mounting the plate cylinder in a rotatable state around the central axis;
rotation angle adjustment means for adjusting a reference mark, which is marked on the plate cylinder and indicates a reference position of a printing pattern, to a predetermined rotation position;
angle measuring means for measuring an angle between a rotational position of a key groove formed on the plate cylinder and positioning and fixing the plate cylinder to the printing unit and a rotational position of the reference mark;
The angle measuring means
an insertion portion inserted into a support hole formed at one end of the plate cylinder in the central axis direction;
a key portion formed in the insertion portion and fitted into the key groove;
a goniometer for measuring the rotation angle around the central axis of the key portion ;
A plate cylinder phase difference measuring device characterized by: The rotation angle adjusting means is
irradiating a laser beam from vertically above the central axis of the plate cylinder mounted on the mounting table;
The plate cylinder phase difference measuring device according to claim 1, characterized in that: The goniometer
capable of measuring a relative angle between the rotational position of the keyway and the rotational position of the fiducial mark;
3. The plate cylinder phase difference measuring apparatus according to claim 1, wherein: Place the plate cylinder in a rotatable state around the central axis,
adjusting the reference mark indicating the reference position of the printing pattern, which is marked on the plate cylinder, to a predetermined rotational position;
angle measuring means formed on the plate cylinder for measuring an angle between a rotational position of a key groove for positioning and fixing the plate cylinder to the printing unit and a rotational position of the reference mark; inserting it into a support hole to be supported, and measuring the angle between the rotation angle of the key groove and the rotation position of the reference mark;
A printing cylinder phase difference measuring method characterized by:

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