JPH0413168Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention uses optical fiber to remove defects such as printing stains that occur when printing on packaging materials such as plastic film, paper, and aluminum. The present invention relates to a position adjustment device for a detection unit of an apparatus that performs color photometry to illuminate and measure light.

(Prior Art) Printing on packaging materials such as plastic film, paper, and aluminum is generally performed by gravure printing. In this gravure printing, the rotating gravure cylinder or ink forming roller is immersed in the ink in the tray, so when printing at high speed, the ink tends to scatter, and the scattered ink may stick to the printed matter and cause stains. There is a problem that printing defects occur. Since such defects occur irregularly in spots, they are difficult to detect, and the reality is that visual inspection is performed after printing is completed and the winding is rewound at a low speed.

As a detection device for such printing defects, two sets of color sensor elements are arranged horizontally in a row, each of which receives visible light, separates it into red, green, and blue, and generates the corresponding output voltage. A detection unit is used, and this unit is arranged perpendicular to the flow direction of the running printing sheet, and the gap between each detection unit is set so that the printed pattern is shifted by one or several pitches, so that the color sensor element detects the printing sheet. They are arranged so as to correspond to each other with respect to the flow direction, and the reflected light from the printed sheet is received by the two sets of detection units described above, and the red, green, and blue of the corresponding color sensor elements between the two sets of detection units are detected. There is an apparatus that detects defects in printed matter by calculating a voltage difference and comparing this voltage difference with a preset voltage.

FIGS. 5a and 5b are explanatory diagrams showing the relationship between the detection unit and the printing sheet, in which 2A and 2B are the detection units, 3 is the control device, W is the printing sheet,
A and B represent printed patterns. In the figure, the detection units A and B are arranged with their longitudinal directions separated by one pitch of the printed pattern with respect to the direction of the sheet W, and the same pattern is continuously printed on the sheet W. Therefore, as shown in FIG. 5b, the color sensor 2a in the detection unit A and the color sensor 2b in the detection unit B are used to detect the parts where adjacent patterns A and B correspond, that is, the true parts of the same pattern. Similarly, for the other color sensors, detection unit A and detection unit B are located directly above the same picture area.

In this way, two detection units 2A and 2
Irregular defects on the sheet W are detected by installing B at a position separated by one pitch or several pitches of the printed pattern on the sheet W, and calculating and processing the detection signals of each detection unit by the control device 3. be able to.

(Problems with the Prior Art) In order to accurately detect defects in printed matter using the method described above, it is necessary to make the detection conditions of each detection unit completely the same.
In order to obtain this same condition, it is desirable to detect defects in printed matter on the roll so that the position of the sheet W does not fluctuate due to flapping, etc., and furthermore, it is desirable to detect defects in the printed matter on the roll so that the position of the sheet W does not fluctuate due to flapping, etc., and furthermore, it is desirable to detect defects in the printed matter on the roll so that the position of the sheet W does not fluctuate due to flapping etc. It is desirable to locate this detection unit at the top of the roll circumferential surface where the variation in the distance range is the smallest.

In order to obtain the same conditions as above, the patent application
A positioning device as shown in No. 60-79412 has been proposed by the applicant.

However, when using such a device to position the detection unit so that it is at the top of the roll circumferential surface, the operator must visually check the distance between the detection unit and the roll, making accurate positioning difficult. This poses a problem that not only is it impossible to do this, but it also takes a long time to operate.

(Purpose of the invention) The present invention has been made in view of the above points, and it is possible to detect the distance between the detection unit and the roll without visual inspection, and to position the detection unit so that it is on the circumferential surface of the roll in a short time. It is an object of the present invention to provide a position adjustment device that can perform accurate position adjustment.

(Summary of the invention) In order to achieve this purpose, the present invention is provided with a detection unit of a device for detecting defects in printed matter by performing color photometry on the circumferential surface of the roll at one end, and an engaging member at the other end. a support member provided, a horizontal movement mechanism that moves the support member horizontally on the circumferential surface of the roll by rotation of a screw screwed into the engagement member; an elevating mechanism that moves up and down in a vertical direction with respect to the horizontal direction by rotation of screws that are combined;
A printing defect detection unit comprising: a detector that detects the distance between both ends of the roll axis of the detection unit and the circumferential surface of the roll; and a display that displays detection information from the detector. Provides a position adjustment device.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1a is a schematic front view of an apparatus showing an embodiment of the present invention. In the figure, 2A and 2B are detection units of the printing defect detection device, 3 is a control device of the printing defect detection device, 4 is an optical fiber that illuminates the printing surface and performs photometry, 5A and 5B are mark detection devices, and 6A and 6B are is a fixed roll, 7 is a control device, 8 is a
is a DC motor, 9 is a moving roll, 18A, 18B
1 is a distance detector, 19 is a display, 20A and 20B are position adjustment devices for the detection units 2A and 2B, and W is a sheet with a pattern printed thereon.

The detection units 2A, 2B are placed on the support members 28, 28 of the position adjustment devices 20A, 20B, which have the same structure, and are located at the top of the peripheral surface of the fixed rolls 6A, 6B, so that the position adjustment devices 20A, 20B face each other. It is located. Detection unit 2A, 2
Distance detectors 18A and 18B are attached to both ends of B, and the distance detectors 18A and 18B are connected to a display 19. A magnetic sensor, a photoelectric sensor, a capacitance sensor, etc. are used for this distance detector. The display 19 is a distance detector 18A, 18
B displays the measured distance between the detection units 2A, 2B and the fixed rolls 6A, 6B,
It may be a device that directly displays the measured distance of each distance detector, or it may be a device that uses a lamp display or the like to determine whether or not both ends of the detection units 2A and 2B are within a preset distance range. Good too.

FIG. 1b is a left side view of the position adjustment device 20A. In the figure, a pair of distance detectors 18A, 18A are attached to both longitudinal ends of the detection unit 2A, and the upper part of the support members 28, 28, 28 on which the detection unit 2A is set is attached to the main roll 2.
6, and both ends of the main roll 26 are placed on sub rolls 27, 27. Vice roll 27
is fitted and fixed to the roll support member 25 as shown in FIG. . The threaded portion of the rod 24 engages with the threaded portion of the block 23,
Block 23 is fixed to the bottom end of channel 21. Guides 32, 32 provided with grooves are fixed to the back surface of both ends of the channel 21,
Further, a moving member 36 having a threaded portion is fixed to the back surface of the bottom of the central portion. A pair of angles 35, 35 are arranged along the longitudinal direction of this channel 21, and both ends of the angles 35, 35 are connected to the channels 30, 3 provided perpendicularly to the angle 35.
0, and the channels 30, 30 are fixed to a frame (not shown) of a printing or rewinding machine. Fixing blocks 34, 34 having through holes are fixed to the center portions of the upper surfaces of the angles 35, 35, and a lead screw 37 having a handle 33 fixed to one end thereof is rotatably held in the fixing blocks 34, 34. 37 engages with a threaded portion of the moving member 36. channel 30,
Square members 31, 31 are fixed to the upper surface of the channel 21 in the longitudinal direction.
It is slidably fitted into guides 32, 32 provided at both ends of. Therefore, by rotating the handle 33, the roll supporting members 25, 25, the main roll 26,
The detection units 2A set on the support members 28, 28, 28 move forward and backward as one.

The fixed rolls 6A and 6B have mirror-finished peripheral surfaces and are rotatably supported by a printing press frame (not shown) at predetermined intervals. Fixed roll 6
Detection units 2A and 2B are placed near the circumferential surfaces of sheets A and 6B at the top, and mark detection devices 5A and 5B are placed on the side of the entrance side of sheet W, respectively. It is connected to the control device 7. Furthermore, a movable roll 9 is rotatably supported by a pair of movable members 10 below the middle of the fixed rolls 6A, 6B. The moving member 10 is provided with a threaded portion (not shown) that engages with the lead screw 11, and as the lead screw 11 rotates, the moving roll 9 moves up and down together with the moving member 11. The lead screw 11 is rotatably supported at both ends by support members 13 and 14, and the support members 13 and 14 are fixed to a frame (not shown) of a printing press or a rewinding machine. A gear 12 is fitted and fixed to the tip of the lead screw 11 on the support member 14 side, and the gear 12 meshes with a gear 15 that is fitted and fixed to the rotating shaft of the DC motor 8. DC motor 8 is connected to control device 7 .
Therefore, the DC motor 8 is rotated by a command from the control device 7, and the moving roll 9 is moved up and down by this rotation.

Next, a positioning operation using the above device will be explained.

First, by alternately rotating the handles 22, 22, an operation is performed to maintain a constant distance between the detection unit 2A and the fixed roll 6A in the axial direction of the fixed roll 6A. That is, by rotating the handle 22 of the detection unit 2A, the rod 24 to which the handle 22 is fixed is raised and lowered, and the roll support member 25 is raised and lowered. Since both ends of the main roll 26 are simply placed on the sub rolls 27, 27, only one side of the main roll 26 moves up and down, and the detection unit 2A set on the support members 28, 28, 28 moves up and down. Only one side of is in contact with and separating from the fixed roll 6A. Therefore, the handle 22,2
By alternately rotating the detection unit 2A, both ends of the detection unit 2A can be raised and lowered independently.
During this operation, the distance between the detection unit 2A and the fixed roll 6A is displayed on the display 19 by the distance detectors 18A, 18A, so it is easy to position the detection unit 2A and the fixed roll 6A to maintain a constant gap. , and the detection unit 2A and the fixed roll 6
You can check the parallelism with A. At this time, the distance between the detection unit 2A and the fixed roll 6A is set within a predetermined range.

Next, rotate the handle 33 to detect the detection unit 2.
An operation is performed to position A at the top of the circumferential surface of the fixed roll 6A. That is, the handle 33 is rotated to move the moving member 36 engaged with the lead screw 37. This allows channel 21
moves in the longitudinal direction of the channels 30, 30, the rods 24, 24, roll support members 25, 25, main roll 26, and support members 28, 28, 28 move as one, and the support members 28, 28, 28 The detection unit 2A set in the position moves forward and backward with respect to the traveling direction of the seat W. During this operation, the detection unit 2A is detected by the distance detectors 18A, 18A.
Since the distance between the fixed roll 6A and the fixed roll 6A is displayed on the display 19, the handle 33 can be operated so that the displayed value is minimized.

After this, if the distance between the detection unit 2A and the fixed roll 6A changes and deviates from the predetermined range, operate the handles 22, 22 again to adjust the distance to the predetermined distance, and finally set both ends of the main roll 26. By fixing the detection unit 2A with a stopper (not shown), the operation of positioning the detection unit 2A at the top of the circumferential surface of the fixed roll 6A at a predetermined distance is completed. The positioning operation of the detection unit 2B is performed in the same manner.

FIGS. 2a and 2b show another embodiment of the above-mentioned position adjustment device, and the position adjustment device 20 shown in FIG.
Corresponding to B, FIG. 11A is a schematic front view, and FIG.

In the figure, the position adjustment device 40 is connected to channel 4.
Blocks 42, 42 fixed to both ends of the upper surface of 1
XY stages 43, 43 placed above, Z stage 48 placed on the XY stages 43, 43,
48, and a support plate 60 movably attached to the upper surface of the Z stages 48, 48, and support members 61, 61, 61 connected vertically to the support plate 60.
A detection unit 2B is placed on the lower part of the support members 61, 61, 61, and distance detectors 18B, 1 are placed on both ends of the detection unit 2B in the longitudinal direction.
8B is installed. Further, the channel 41 is fixed to frames 70, 70 of a printing machine or a rewinding machine, and a fixed roll 6 is fixed to the frames 70, 70.
B is rotatably attached.

The XY stage 43 is moved by a micrometer 44 so that the stage surface 45 is horizontal and in the axial direction of the fixed roll 6B (hereinafter referred to as "X direction"), and by a micrometer 46 the stage surface 45 is moved in the axial direction of the fixed roll 6B (hereinafter referred to as "X direction").
moves in a horizontal direction and in a direction perpendicular to the axial direction of the fixed roll 6B (hereinafter referred to as "Y direction"). Z
A stage 50 of the stage 48 is moved in the vertical direction (hereinafter referred to as "Z direction") by a micrometer 49. Therefore, the micrometer 46,4
9, both ends of the detection unit 2B move independently in the Y direction and the Z direction, respectively.
Based on the values displayed on the display 19 by the distance detectors 18B, 18B attached to both ends of the detection unit 2B, the detection unit 2B is positioned at the top of the circumferential surface of the fixed roll 6B with a predetermined gap. can be done.

At this time, the operation is performed using the position adjustment device 20 shown in FIG.
A and 20B may be used, but in the case of the position adjustment device 40, since both ends of the detection unit 2B move independently in the Y direction, the position adjustment device 2
More accurate adjustment can be made than with 0A and 20B.
Note that the detection unit 2 using the micrometer 44
The movement of B in the X direction is performed to adjust the range in which defects in printed matter are detected.

Next, an operation is performed in which the detection units 2A and 2B are positioned directly above the same pattern portion of the sheet W. This operation is performed by rotating the DC motor 8 by operating the operation switch (not shown) of the control device 7 shown in FIG. This is done by changing the

After this, the sheet W is run to detect a defect in the printed pattern, but a description will be given of the pattern position correction operation when the tension of the sheet W changes and the pitch of the printed pattern changes.

On the side edges of the sheet W, as shown in FIG. 4, a group of marks M for printing registration are printed at the pitch of the printed pattern. If the first marks in the traveling direction of the sheet W of the mark group M on the sides of the adjacent patterns A and B are MA and MB, respectively, the interval between the mark MA and the mark MB is the same as the printed pattern pitch. Mark MA and mark MB are detected by mark detection devices 5A and 5B shown in FIG. 1A, and pulses are generated. If a printing defect detection device is installed in the printing press, the gate signal for generating this pulse can be generated by selecting a signal from a resolver that rotates one-to-one with the printing cylinder.
If the printing defect detection device is installed in a place other than a printing machine, for example, in a rewinding machine, select the pulse obtained by detecting the pattern position mark printed in the printed pattern with another mark detection device. It is sufficient to generate a gate signal.

Figure 3 a, b, and c are mark detection devices 5A and 5B.
is the time chart of the pulse that is generated when mark MA and mark MB are detected, and the pulse T _A in the upper row is
is generated by the mark detection device 5A, and the lower pulse T _B is generated by the mark detection device 5B.
As shown in Figure 3a, if the timings of pulse T _A and pulse T _B match, this indicates that the pitch of the printed pattern has not changed from the state in which the detection units 2A and 2B were positioned. Detection units 2A and 2B are located directly above the same picture area. If the pulse T _B occurs later than the pulse T _A as shown in FIG. The DC motor 8 is operated in the upward direction. This movement of the moving roll 9 is continued until the timings of generation of pulse T _A and pulse T _B coincide. On the contrary, the second
If the pulse T _A is generated later than the pulse T _B as shown in Figure c, this indicates that the pitch of the printed pattern has become larger than the initial setting, and the control device 7 lowers the moving roll 9. The DC motor 8 is operated in the direction. This lowering of the moving roll 9 is continued until the timings of generation of pulse T _A and pulse T _B coincide. In this way, when the pitch of the printed pattern changes, the control device 7 operates the DC motor 8 to move the moving roll 9 up and down, so that the detection units 2A and 2B are always positioned directly above the same pattern area. The position of the printed pattern will need to be corrected.

(Effects of the invention) As described above, in the present invention, when detecting defects in printed patterns on a roll using two sets of detection units, the detection unit is placed at the top of the circumferential surface of the roll, This has the effect that adjustment to keep the gap between the detection unit and the roll constant at a predetermined amount in the axial direction can be performed extremely accurately and quickly.

[Brief explanation of drawings]

Fig. 1a is a schematic front view of a device showing an embodiment of the present invention, Fig. 1b is a left side view of the position adjustment device 20A shown in Fig. 1a, and Fig. 2a is shown in Fig. 1a. A schematic front view of the device showing another aspect of the position adjustment device 20B, FIG. 2b is the position adjustment device 40 shown in FIG. 2a.
3a, b, and c are explanatory diagrams of pulses generated by the mark detection devices 5A and 5B shown in FIG. 1a, and FIG. 4 is a side edge of the sheet W shown in FIG. 1a. Figures 5a and 5b, which are explanatory diagrams of the print registration marks printed on the copy, show the positional relationship between the detection units and the printing sheet when two sets of detection units are used to detect defects in printed matter. It is an explanatory diagram. 2A, 2B...Detection unit, 3...Control device, 4...Optical fiber, 5A, 5B...Mark detection device, 6A, 6B...Fixed roll, 7...Control device, 8...DC motor, 9 ...Movement roll,
18A, 18B...Distance detector, 19...Display device, 20A, 20B...Position adjustment device, 22...
Handle, 28... Support member, 33... Handle, 40... Position adjustment device, 43... XY stage, 48... Z stage, 61... Support member.

Claims (1)

[Scope of utility model registration request] A support member is provided at one end with a detection unit of a device for detecting defects in printed matter by performing color photometry on the circumferential surface of the roll, and an engagement member is provided at the other end, and the support member is connected to the engagement member. a horizontal movement mechanism that moves the support member horizontally on the circumferential surface of the roll by rotation of a screw screwed together; and a horizontal movement mechanism that moves the support member vertically with respect to the horizontal direction by rotation of a screw screw screwed to the engagement member. The invention is characterized in that it is comprised of an elevating mechanism, a detector that detects the distance between both ends of the detection unit in the roll axis direction and the circumferential surface of the roll, and a display that displays detection information from the detector. Print defect detection unit position adjustment device.