JP4736027B2 - Multicolor printing system - Google Patents

Description

  The present invention relates to a multicolor printing system having a plurality of plate cylinders, and in particular, multicolor printing capable of easily and accurately performing vertical register adjustment and horizontal register adjustment of each plate cylinder and positioning of a mark sensor for a color mark. About the system.

  2. Description of the Related Art Conventionally, in a multicolor printing system, a color mark printed on a web and a mark sensor for a color mark for detecting the color mark are used in order to match the vertical register. Such adjustment of the mark sensor for the color mark is not performed in a preset manner, but is performed by looking at a picture printed just before the initial registration work.

  This is because in an existing printing system, it is unavoidable to perform the initial registration work, and therefore, the work load is reduced when the adjustment work of the mark sensor for the color mark is performed immediately before that.

  However, in recent years, it has become possible to preset the position of the compensator roller. Therefore, particularly in a multicolor printing system with a lateral register adjustment mechanism, immediately after the start of printing, only for the adjustment of this mark sensor, It is necessary to adjust to the settling and material loss.

  Further, the conventional registration adjustment is performed by matching the phase (pattern standard) of each plate cylinder for every plate cylinder (for example, see Patent Document 1).

  As shown in FIGS. 6 and 7, for example, in order to preset the vertical register of the plate cylinder 12 supported by the frame 11, a register mark 20 such as a register mark is provided on each plate cylinder 12, and the register mark 20 The plate cylinder 12 is set so that is at the same position on the side. Conventionally, only the phase of the plate cylinder 12 is matched with the laser from the horizontal laser irradiator 21, and the lateral registration is not performed.

6 and 7, the web W is sandwiched between the plate cylinder 12 and the impression cylinder 13.
JP-A-1-99846

  Further, in order to adjust the lateral register of the plate cylinder 12 with high accuracy, the lateral register is actually performed while looking at the register mark actually printed on the web W.

  Further, in reality, the positioning of the mark sensor for detecting the color mark printed on the web W is performed while viewing the color mark printed on the web W.

  The present invention has been made in consideration of such points, and multi-color printing capable of easily and accurately performing longitudinal register adjustment and lateral register adjustment of each plate cylinder and positioning of a mark sensor for a color mark. The purpose is to provide a system.

The present invention includes a plurality of plate cylinders that perform printing of different colors on a web, a compensator roll provided between the plate cylinders, a control unit that controls each compensator roll, and a guide that extends in parallel with each plate cylinder. A pointer that is slidable along the guide, and a mark sensor that is coupled to the pointer and that slides along the guide together with the pointer. A color mark forming portion is provided on each plate cylinder, and the pointer Irradiates the color mark forming part with light, the mark sensor detects the color mark on the web printed by the color mark forming part , and the mounting table that integrally supports the pointer and the mark sensor slides on the guide Each plate cylinder is moved by irradiating light from the pointer to the color mark forming portion of each plate cylinder, so that each plate cylinder is moved to the side of the color mark forming portion. The mark sensor provided in correspondence with each plate cylinder detects a self-colored color mark, and the mark sensor provided corresponding to each plate cylinder automatically detects at the same timing. A multicolor printing system that detects a color mark of a color and sends a detection signal to a control unit.

  The present invention is the multicolor printing system, wherein the color mark forming portion on the plate cylinder is formed in a triangular shape, a quadrangular shape, or a parallel line.

  As described above, according to the present invention, it is possible to easily and accurately perform the longitudinal register adjustment and the lateral register adjustment and the positioning of the color mark mark sensor for each plate cylinder.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams showing an embodiment of a multicolor printing system according to the present invention.

  As shown in FIGS. 1 to 4, the multicolor printing system includes a plurality of printing units 10, 10a, 10b, 10c,... Arranged in multiple stages. Each of these printing units 10, 10a, 10b, 10c,... Prints different colors on the web W to perform multicolor printing. Further, convenor rollers 20a, 20b, 20c,... Are arranged between the printing units 10, 10a, 10b, 10c,.

  Each printing unit 10 is provided with a frame 11, a plate cylinder 12 that is rotatably arranged on the frame 11, and has a color mark forming portion 30 on the surface thereof, and an impression cylinder that holds the web W between the plate cylinder 12. 13. Among these, the color mark forming portion 30 has a triangular shape including a straight line 30 a extending in the circumferential direction of the plate cylinder 12 and a straight line 30 b extending in the axial direction of the plate cylinder 12 at its end.

  The color mark forming unit 30 has a triangular shape having straight lines 30a and 30b and an intersection point 30c, but the direction of the triangular shape is not limited to that shown in FIG. Further, the color mark forming unit 30 may be formed in a quadrangular shape or a parallel line.

  A guide 15 extending parallel to the axis of the plate cylinder 12 is provided outside each plate cylinder 12. The guide 15 is fixed to the frame 11, and a mounting table 16 is movably provided along the guide 15. A laser point 16 a and a mark sensor 19 are fixed on the mounting table 16. Among these, the laser point 16a irradiates the color mark forming unit 30 with a cross-shaped laser beam, and the mark sensor 19 detects the color mark 31 printed on the web W by the color mark forming unit 30. It is.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, from the drawing of the printed pattern (plate making drawing), the mounting table 16 is moved on the guide 15 and the value of the position display section (scale) provided on the guide 15 is viewed while the laser pointer 16a is the color mark forming section. When it comes to 30, the mounting table 16 is stopped. Next, the plate cylinder 12 is arranged so that the cross-shaped pointer from the laser pointer 16 a mounted on the mounting table 16 coincides with the color forming portion 30 of the new plate cylinder 12 to be produced that is mounted in the frame 11. Are moved laterally and circumferentially within the frame 11. In this way, for each of the printing units 10, 10a, 10b, 10c..., The plate alignment is completed by making all the horizontal positions of the plates and the circumferential positions (plate phases) of the plates coincide.

  Next, in order to easily adjust the vertical register in this state, a positioning preset for the convenience sweater roller is performed. In order to align the vertical register of each printing unit 10, 10a, 10b, 10c, ..., the conven sweater roll 20a has an inter-unit path length (web path length between printing units) that is an integral multiple of the plate cylinder circumference. , 20b, 20c by presetting the positions. The details of the preset are the same as those described in JP-A-62-130854. Thus, in order to align the vertical register by calculation in advance without printing, accurate plate phasing is required in all the printing units 10, 10a, 10b, 10c.

  Further, since the horizontal position of the plate cylinder 12 can be made the same in all the printing units 10, 10a, 10b, 10c..., The lateral registration can be easily adjusted before printing. Further, since the mark sensor 19 is fixed to the mounting table 15 together with the laser point 16a, and the cross-shaped laser beam from the laser point 16a can be aligned with the color mark forming unit 30, the mark sensor 19 can be positioned at the same time. it can.

  That is, the cross mark-shaped laser beam from the laser point 16 a can be aligned with the color mark forming unit 30 and the mark sensor 19 detects the color mark 31 printed by the color mark forming unit 30. Since the laser point 16a and the mark sensor 19 are integrally fixed to the mounting table 15, the mark sensor 19 can be positioned at the same time by arranging the laser point 16a at a predetermined position.

  The cross-shaped laser beam from the laser point 16 a is aligned with the intersection 30 c provided at the end of the color mark forming unit 30 and the mark sensor 19 detects the color mark 31 printed by the color mark forming unit 30. Therefore, it is preferable that the laser point 16a is shifted by a half of the horizontal width of the color mark 31 in the horizontal direction with respect to the mark sensor 19.

  The color mark 31 printed on the web W is read by the mark sensor 19 of each printing unit 10, 10 a, 10 b, 10 c..., And a signal from the mark sensor 19 is sent to the control unit 25. The control unit 25 adjusts the compensator rolls 20a, 20b, and 20c so that the phases of the plate cylinders 12 of the printing units 10, 10a, 10b, and 10c coincide (FIG. 4).

  Next, the adjusting action of the compensator rolls 20a, 20b, and 20c by the control unit 25 will be described by comparing the case of the present invention with the comparative example.

  In the comparative example shown in FIGS. 5 (a) and 5 (b), if the plate phases of the plate cylinders 12 of the printing units 10, 10a, 10b, 10c. The positions of the compensator rolls 20a, 20b, and 20c are determined so as to be the bus length. Normally, the basic path lengths of the printing units 10, 10a, 10b, 10c,... Are the same, so the positions of the compensator rolls 20a, 20b, 20c are common to all the units 10, 10a, 10b, 10c,.

  On the other hand, since the establishment of the gate address in the control unit 25 is somewhat troublesome, the conditions are simply set and described. Here, the reference position of the plate cylinder 12 (the lower surface of the D cut) is used as a reference, and the address value at this time is set to 0 (FIG. 5A). When the circumference of the plate cylinder 12 is 500 mm, the number of pulses per rotation is 1000, and the adjacent color control is performed by the arrangement of the reverse color marks, as shown in FIG. The timing when 31 passes T2 of the second printing unit 10a is when the address value is 430 pulses. The timing at which the self-colored color mark 31a of the second printing unit 10a passes T1 is also an address value 430 pulses. That is, it can be seen that the gate address to be set by the second printing unit is 430 pulses (FIG. 5B).

  Similarly, the self-colored color mark 31a of the second printing unit 10a passes through T2 of the third printing unit 10b at 390 pulses, and the self-colored color mark 31b of the third printing unit 10b passes through T1 at 390. It is a pulse. Therefore, the gate address to be set for the third printing unit 10b is 390 pulses, and the gate address to be set for the fourth printing unit 10c is 350 pulses. In this way, it can be seen that the gate address in the control unit 25 is decreased by 40. However, if the circumference of the plate cylinder 12 is different, the address value is different even at the same distance on the web W. It is not such a simple numerical value.

  Next, the operation of adjusting the compensator rolls 20a, 20b, and 20c by the control unit 25 of the present invention will be described.

  For simplicity, the case of having adjacent color and positive color marks will be described.

  As shown in FIG. 4, according to the present invention, the mark sensor 19 is provided at the same phase position with respect to the corresponding plate cylinder 12 for each printing unit 10, 10 a, 10 b, 10 c. Therefore, the timing when the mark sensor 19 of the printing unit 10 detects the color mark 31 of the own color, the timing when the mark sensor 19 of the printing unit 10a detects the color mark 31a of the own color, and the mark sensor 19 of the printing unit 10b. The timing at which the self-color mark 31b is detected and the timing at which the mark sensor 19 of the printing unit 10c detects the self-color mark 31c are the same. In this case, when the address value is 0, the gate address to be set in the control unit 25 is 0.

  However, paying attention to the printing units 10 and 10a, the two printing units 10 and 10a are different in phase of the plate cylinder 12 by 20 mm corresponding to the distance between the color marks 31 and 31a at the surface distance of the plate cylinder 12.

  That is, when the self-colored color marks 31, 31a, 31b, 31c are used as a reference, the gate address value calculated from the distance from the nip point of the impression cylinder 13 to the color marks 31, 31a, 31b is common to all printing units. It has become.

  Here, T1 and T2 indicate positions where the color marks 31, 31a and 31b are detected by the mark sensor 19.

  As described above, according to the present invention, the lateral register adjustment of the plate cylinder 12 and the positioning adjustment of the mark sensor for the color mark can be easily and easily performed.

  Incidentally, as described above, when the intersection of the color mark forming portion 30 of the new plate cylinder 12 is detected by the laser pointer 16a, the position of the mounting table 16 is set for each printing unit 10, 10a, 10b, 10c. A power value may be input in advance, and the mounting table 16 may be moved based on this value.

  Further, after the new plate cylinder 12 is set at a predetermined position, the mark sensor 19 can detect the color mark 31, 31a, 31b in correspondence with the meandering and shift at the start of printing as follows. You may take appropriate measures.

  That is, in the case where the color marks 31, 31a, 31b having a right isosceles triangle with a side of 20 mm are simply used, first, the lateral registration adjustment, position adjustment, and positioning of the mark sensor 19 of the new plate cylinder 12 are completed. At the time, the mark sensor 19 enters the light for a length of 10 mm. When printing is started, the speed is increased and the web W is shifted in the horizontal direction so that the light incident length of the mark sensor 19 becomes 2 mm or 18 mm, and the mark sensor 19 removes the color mark due to the meandering of the web W. there is a possibility.

  Therefore, light enters the color marks 31, 31a, 31b, and the light incident length of the mark sensor 19 is set to 10 mm until the speed increases, and the light of the mark sensor 19 is brought to the center.

1 is a perspective view showing an embodiment of a multicolor printing system according to the present invention. The enlarged view which shows a laser point and a mark sensor. The figure which shows the color mark formation part formed on the plate cylinder. 1 is an overall configuration diagram showing a multicolor printing system according to the present invention. 1 is an overall configuration diagram showing a multicolor printing system according to a comparative example. The figure which shows the conventional multicolor printing system. The figure which shows the conventional multicolor printing system.

Explanation of symbols

10, 10a, 10b, 10c ... Printing unit 11 Frame 12 Plate cylinder 13 Impression cylinder 15 Guide 16 Mounting table 16a Laser pointer 19 Mark sensor 20a, 20b, 20c Compensator roll 30 Color mark forming part 30a, 30b Two orthogonal straight lines 30c Intersection point

Claims (2)

A plurality of printing cylinders for printing different colors on the web ;
A compensator roll provided between the plate cylinders;
A control unit for controlling each compensator roll;
A guide extending parallel to each plate cylinder;
A pointer slidably provided along the guide;
A mark sensor coupled to the pointer and sliding along the guide along with the pointer;
A color mark forming part is provided on each plate cylinder,
The pointer irradiates the color mark forming part with light,
The mark sensor detects the color mark on the web printed by the color mark forming unit ,
A mounting table that integrally supports the pointer and the mark sensor is slidably provided on the guide,
By irradiating light from the pointer to the color mark forming portion of each plate cylinder, each plate cylinder is moved so that the horizontal position and the circumferential position of the color mark forming portion match each plate cylinder,
The mark sensor provided for each plate cylinder detects the self-colored color mark, and the mark sensor provided for each plate cylinder detects and detects the self-colored color mark at the same timing. A multicolor printing system characterized by sending a signal to a control unit.   2. The multicolor printing system according to claim 1, wherein the color mark forming portion on the plate cylinder has a triangular shape, a quadrangular shape, or a parallel line.

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