JP2019010804A - Print roll cleaning apparatus - Google Patents

Abstract

To provide a print roll cleaning apparatus that can minimize the processing of waste liquid, can simplify and miniaturize the apparatus, can save a space and reduce cost, and further can remove stain efficiently reliably.SOLUTION: A print roll cleaning apparatus includes: first support means 11 for rotatably supporting a print roll 10; first drive means 12 for rotating the print roll 10; imaging means 3 for imaging the surface 10a of the print roll 10; cleaning means 2 for cleaning a partial length region of the print roll 10 over the whole circumference; second support means 21 for supporting the cleaning means 2 in a movable manner along the axial direction of the print roll 10; second drive means 22 for moving the cleaning means 2 along the axial direction of the print roll 10; detection means 63 for detecting the stain on the surface of the print roll, based on the pick-up image imaged with the imaging means 3; and position control means 64 for operating the second drive means 22, based on detection results of the detection means 63, and controlling the axial position of the cleaning means 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a printing roll cleaning apparatus that can efficiently and reliably remove dirt.

  A printing roll of a printing press has a surface that is clogged with ink and has dried “dirt”. If printing is continued with the stains attached, the amount of ink deposited will change, causing printing defects such as missing colors. Therefore, conventionally, the printing roll is regularly cleaned. In some cases, cleaning of the printing roll may be completed simply by wiping the surface with a cloth or the like with a cleaning solution, but especially for dirt such as dry ink adhering to the back of the deep groove of the intaglio, I can't drop it easily.

  In order to remove such dirt that is difficult to remove, prepare a cleaning tank that contains cleaning liquid, immerse the entire printing roll in the cleaning liquid in the tank, and then operate the ultrasonic oscillator installed in the tank to A fine portion is cleaned by sonic vibration. Similarly, as a cleaning method using ultrasonic waves, without removing the printing roll from the printing machine, a similar cleaning tank with an ultrasonic oscillator is lifted with respect to the printing roll on the printing machine, and the printing roll is washed in the tank. There has also been proposed a method of immersing a part in the surface and cleaning the surface by ultrasonic vibration (see, for example, Patent Document 1).

  However, in the method in which the roll is immersed in the cleaning liquid in the cleaning tank in this way, a large amount of cleaning liquid waste liquid comes out. In addition, there is a problem that the apparatus becomes large, and there is a problem of installation space and cost. In addition, after cleaning, the entire surface is visually checked, but it is difficult to determine the stain of the ink remaining in the bottom of the deep and narrow groove, which requires labor and time.

JP 2010-58505 A

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem that waste liquid processing can be minimized, the apparatus can be simplified and reduced in size, and space saving and cost reduction can be achieved. In addition, the present invention is to provide a printing roll cleaning device that can efficiently and reliably remove dirt.

The present invention includes the following inventions.
(1) A printing roll cleaning apparatus for cleaning the surface of a printing roll, wherein the first supporting means for rotatably supporting the printing roll, and the first rotating the printing roll supported by the first supporting means. Driving means, imaging means for imaging the surface of the printing roll, and a partial length region of the rotating printing roll that partially faces and rotates in a region of a predetermined length of the axial total length of the surface of the printing roll Cleaning means for cleaning the entire circumference, second supporting means for supporting the cleaning means movably along the axial direction of the printing roll, and cleaning means supported by the second supporting means for the printing roll. Based on a second drive unit that moves along the axial direction, a detection unit that detects dirt attached to the surface of the printing roll based on a captured image captured by the imaging unit, and a detection result of the detection unit, Said second driving hand A printing roll cleaning apparatus comprising: a position control unit that operates a stage and controls a position of the cleaning unit along the axial direction.

  (2) Third support means for supporting the image pickup means movably along the axial direction of the print roll, and moving the image pickup means supported by the third support means along the axial direction of the print roll. (3) The printing roll cleaning apparatus according to (1), further including a third driving unit, wherein the imaging unit images the same partial length region including the partial length region cleaned by the cleaning unit.

  (3) (1) or (2), wherein the cleaning means is an ultrasonic cleaning device, and a receiving container is provided below the printing roll to receive the cleaning liquid supplied from the ultrasonic cleaning device and traveling down the roll surface. Printing roll cleaning equipment.

  According to the printing roll cleaning apparatus according to the present invention as described above, the partial length region of the rotating printing roll that partially faces and rotates in a predetermined length of the axial total length of the surface of the printing roll. Since the cleaning means for cleaning the entire circumference is provided, compared to the conventional method of immersing in the cleaning tank, the amount of the cleaning liquid can be reduced, and the cleaning means can be small. Space saving and cost reduction can be achieved.

  In addition, since the apparatus includes a position control unit that detects dirt based on a captured image of the surface of the printing roll imaged by the imaging unit, operates the second driving unit based on the detection result, and controls the position of the cleaning unit. It is possible to efficiently and efficiently clean the dirty part. Since dirt is detected by the imaging means, confirmation after washing and re-washing can be performed more reliably, and dirt can be removed efficiently and reliably.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which looked at the printing roll washing | cleaning apparatus concerning typical embodiment of this invention from the side surface side. Similarly explanatory drawing seen from the front side. The block diagram which similarly shows the structure of a control part.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the printing roll cleaning apparatus 1 of the present embodiment is provided on a hand cart 13 so that the surface 10 a of the stored printing roll 10 can be cleaned while being transported by the cart 13. It is composed. Due to the trend toward smaller lots in recent years, the printing roll is frequently replaced. In this embodiment, cleaning is performed using the timing of the replacement. However, the present invention is not limited to such a carriage mounted.

  Specifically, the 1st support means 11 which supports the printing roll 10 rotatably, the 1st drive means 12 which rotates the printing roll 10, the imaging means 3 which images the surface 10a of the printing roll 10, A cleaning unit 2 that partially faces a region of a predetermined length in the axial total length of the surface 10a of the printing roll 10 and cleans the partial length region of the rotating printing roll 10 over the entire circumference, and a cleaning unit The second support means 21 that movably supports 2 along the axial direction of the printing roll 10, and the cleaning means 2 supported by the second support means 21 moves along the axial direction of the printing roll 10. 2, the detection means 63 for detecting dirt adhering to the surface of the printing roll based on the image captured by the imaging means 3, and the second driving means based on the detection result of the detection means 63. Operate 22 It is characterized in that it comprises a position control means 64 for controlling the position along the axial direction of the cleaning unit 2.

  Reference numeral 7 denotes a power source (battery) for operating each unit. Although the gravure printing roll is effective as the printing roll 10 to be cleaned, it can also be suitably used for cleaning a flexographic printing roll and other printing rolls.

  The first support means 11 that supports the printing roll 10 is provided with a pair of support rollers 40, 40 that rotatably support the end of the printing roll 10 on both ends. However, the 1st support means 11 is not limited to such a form at all, The form which supports the both ends of the printing roll 10 by a central axis, and the other well-known rotation support structure are possible.

  As the first drive means 12, a pulley 41 or a sprocket is provided on the shaft 44 of the support roller 40, and a drive motor 43 for driving the pulley 41 or the sprocket via a belt 42 or a chain is provided. By rotating the support roller 40 by the drive motor 43, the printing roll 10 placed on the support roller 40 rotates about its own axis. The 1st drive means 12 is not limited to such a form at all. For example, if the first support means 11 supports the printing roll 10, it is of course possible to adopt a drive structure that rotationally drives the shaft.

  As the cleaning means 2, a small ultrasonic cleaning device 20 is provided. Specifically, a cleaning head 24 equipped with an ultrasonic oscillator, and a discharge nozzle 25 that is attached to the cleaning head 24 and discharges a cleaning liquid (for example, water) between the cleaning head 24 and the roll surface 10a. In addition, an ultrasonic cleaning apparatus in which the cleaning head 24 and the discharge nozzle 25 are integrally assembled is supported by the second support means 21 so as to be movable along the axial direction of the printing roll 10. Reference numeral 26 in FIG. 1 is a tank for storing cleaning liquid, 27 is a pump for sending the cleaning liquid from the tank, and 28 is a flexible hose for supplying the cleaning liquid sent from the pump to the discharge nozzle 25 that moves as described above.

  As the second support means 21 for supporting the cleaning means 2, a guide shaft 50 and a feed screw 51 for transferring the ultrasonic cleaning device 20 in parallel to the axis of the printing roll 10 are provided. The guide shaft 50 is passed through an insertion hole provided in the axial direction of the printing roll 10 through the support main body 29 that supports the cleaning head of the ultrasonic cleaning device 20 so that the ultrasonic cleaning device 20 can be moved in the axial direction. I support it.

  Similarly, the feed screw 51 is screwed into a screw groove provided in the axial direction of the printing roll 10 on the support main body 29, and supports the ultrasonic cleaning device 20 so as to be capable of screw feeding in the axial direction. The feed screw 51 and the motor 52 that rotates the feed screw 51 constitute a second drive unit 22 that moves the cleaning unit 2 (ultrasonic cleaning device 20) along the axial direction of the printing roll 10.

  Below the printing roll 10, a receiving container 23 having a length over the entire length of the printing roll is provided to receive the cleaning liquid supplied from the discharge nozzle 25 of the ultrasonic cleaning device 20 and flowing down the roll surface 10a.

  The cleaning means 2 is not limited to the ultrasonic cleaning device, and is preferably composed of another cleaning device such as one provided with a high-pressure cleaning device that jets the cleaning liquid at a high pressure, or a combination with another cleaning device. . In addition, combining a drying device that blows warm air to dry the cleaning liquid is also a preferred embodiment for detecting dirt after cleaning. In addition to the screw feed mechanism, a known mechanism such as a cylinder drive feed mechanism or a timing belt feed mechanism can be adopted for the second support means 21 and the second drive means 22.

  In this example, the imaging unit 3 includes an imaging camera 30 that captures a partial length region including the partial length region of the printing roll 10 that the cleaning unit 2 cleans. The third support means 31 that supports the (imaging camera 30) movably along the axial direction of the printing roll 10 and the imaging means 3 (imaging camera 30) supported by the third supporting means 31 are connected to the printing roll 10. And a third driving means 32 for moving along the axial direction.

  The imaging camera 30 can be an area sensor camera in which a plurality of CCD and CMOS imaging elements are arranged in the vertical and horizontal directions. The number and arrangement of the cameras are not particularly limited as long as the surface of the printing roll can be imaged. A line sensor camera in which a plurality of CCDs or CMOS image sensors are arranged in parallel in the lateral direction perpendicular to the transport direction may be used to capture an image over the entire length of the printing roll 10. The imaging unit 3 is also provided with an illuminating unit (not shown) that illuminates the surface 10a of the printing roll 10 for imaging.

  The third support means 31 and the third drive means 32 are configured by a screw feed mechanism, similar to the second support means 21 and the second drive means 22 of the ultrasonic cleaning device described above. Specifically, a guide shaft 53 and a feed screw 54 for transferring the imaging camera 30 in parallel with the axis of the printing roll 10 are provided as the third support means 31.

  The guide shaft 53 is passed through an insertion hole provided in the axial direction of the printing roll 10 through a support main body portion 33 that supports the imaging camera 30, and supports the imaging camera 30 so as to be movable in the axial direction. Similarly, the feed screw 54 is screwed into a thread groove provided in the axial direction of the printing roll 10 on the support main body 33, and supports the imaging camera 30 so that the screw can be fed in the axial direction. The feed screw 54 constitutes the third drive means 32 together with a motor 55 that rotates the feed screw 54. As for the third support means 31 and the third drive means 32, well-known mechanisms such as a cylinder drive feed mechanism and a timing belt feed mechanism can be adopted in addition to the screw feed mechanism.

  The detection unit 63 and the position control unit 64 are configured by a computer of the control unit 6. The control unit 6 controls various operations such as the first driving unit 12, the cleaning unit 2, the second driving unit 22, the imaging unit 3, and the third driving unit 32 that rotationally drive the printing roll 10. The CPU 61 such as a microprocessor is mainly configured to input / output various information through an input / output unit and a bus line.

  Inside and outside the control unit 6 is provided with storage means 62 composed of a storage memory such as a RAM and a ROM, a hard disk inside and outside the apparatus, etc., and programs and processing data for defining procedures of various processing operations in the control unit 6 are stored. . In this example, as shown in FIG. 3, a captured image storage unit 62a that stores an image captured by the imaging unit 3, a master image storage unit 62b that stores a master image serving as a reference, and an image of a detected dirty portion Is stored at least, and a position storage unit 62d for storing the position of the detected dirty part.

  The CPU 61, as shown in FIG. 3, in addition to the operation control processing unit 60 that controls the operations of the first driving unit 12, the cleaning unit 2, the second driving unit 22, the imaging unit 3, the third driving unit 32, and the like. In addition, the picked-up image storage processing unit 61a that receives picked-up image data from the image pickup unit 3 and stores the picked-up image data in the picked-up image storage unit 62a of the storage unit; A stain detection processing unit 61b, a position specification processing unit 61c as a position specifying unit for specifying the position of the detected stain on the printing roll surface 10a, and a detected image of the stain part as a stain part image storage unit 62c. And a position storage processing unit 61e for storing the position of the specified dirty part in the position storage unit 62d. These functions are stored in the program of the storage means 62. It is realized by such.

  The dirt detection processing unit 61b compares the image picked up by the image pickup unit 3 with the master image of the master image storage unit 62b, and when the difference between the density level comparison values exceeds a preset allowable range, A part exceeding the allowable range is detected as a dirty part (ink remaining, etc.). The master image stored in the master image storage unit is a multi-gradation area image having a density level of 256 gradations or more, similar to the captured image, and the comparison means compares the multi-gradation area image of the image to be inspected with the master image. The density level difference of each part is obtained by comparing with the multi-gradation area image.

  The position specifying processing unit 61c grasps the position of the image pickup unit 3 from the operation of the third drive unit 32 (motor angular position information) and determines the position of the dirt portion from the end of the image (end in the print roll axis direction). The distance can be specified by the distance. The position in the rotation direction of the printing roll may be further specified from the angular position information of the first driving means that rotationally drives the printing roll.

  The dirt detection processing unit 61b and the position specification processing unit 61c function as the detection unit 63. Further, the motion control processing unit 60 operates the second driving unit 22 based on the detection result of the detection unit 63, that is, the position information stored in the position storage unit 62d of the dirty part, and the axial direction of the cleaning unit 2 It functions as a position control means 64 for controlling the position along the line.

  Various timings of processing operations of the respective units by the control unit 6 are possible. For example, when the imaging unit 3 is configured to move as in this example, the cleaning unit 2 and the imaging unit 3 may be moved while keeping the axial position of the printing roll 10 at the same position, The imaging means 3 may move ahead of time. The movement of the cleaning means 2 and the image pickup means 3 is performed by repeatedly moving and stopping for each length region (range) in which the cleaning means 2 can be cleaned at the same axial position to detect cleaning, imaging, and contamination. It is preferable to sequentially move to the position where the adjacent partial length region is cleaned for each distance.

  It may be controlled such that only the image pickup means 3 is moved and the detection means 63 detects the contamination and position of the region over the entire length, and then the cleaning means 2 is moved to the position and cleaned. Further, the cleaning means 2 is preceded, the surface 10a after the cleaning is imaged by the imaging means 3, the dirt and position of the unwashed surface is detected by the detection means 63, and the cleaning means 2 is moved again to the position and cleaned. You may make it go.

  When the cleaning means 2 and the imaging means 3 are run at the same axial position, the imaging means 3 images the surface 10a before and after the cleaning by the cleaning means 2 at a predetermined stop position, and the detection means 63 cannot detect dirt. You may comprise so that it may move to the next stop position at the stage.

  When the image pickup means 3 picks up an area covering the entire length of the printing roll 10 with a line sensor camera, the image pickup means 3 does not move. In this case, the position of dirt on the entire surface imaged by the image pickup means 3 can be detected by the detection means 63, and the cleaning means 2 can be moved to the position of the dirt and sequentially cleaned. The detection of the presence / absence of dirt after washing may be performed by imaging / detecting after all the positions of each dirt have been washed, or imaging / detecting while washing the next position.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such an Example at all, In the range which does not deviate from the summary of this invention, such as what was comprised as an installation type apparatus instead of the trolley | bogie 13. Of course, it can be implemented in various forms.

DESCRIPTION OF SYMBOLS 1 Printing roll washing | cleaning apparatus 2 Cleaning means 3 Imaging means 6 Control part 7 Battery 10 Printing roll 10a Surface 11 1st support means 12 1st drive means 13 Cargo 20 Ultrasonic cleaning apparatus 21 2nd support means 22 2nd Drive means 23 Receiving container 24 Washing head 25 Discharge nozzle 26 Tank 27 Pump 28 Hose 29 Support body part 30 Imaging camera 31 Third support means 32 Third drive means 33 Support body part 40 Support roller 41 Pulley 42 Belt 43 Drive motor 44 shaft 50 guide shaft 52 motor 53 guide shaft 55 motor 60 operation control processing unit 61a captured image storage processing unit 61b detection processing unit 61c position specifying processing unit 61d dirt portion image storage processing unit 61e position storage processing unit 62 storage means 62a captured image Storage unit 62b Master image Storage unit 62c dirty part image storage unit 62d position storage section 63 detecting means 64 position control means

Claims (3)

A printing roll cleaning device for cleaning the surface of a printing roll,
First support means for rotatably supporting the printing roll;
First driving means for rotating a printing roll supported by the first supporting means;
Imaging means for imaging the surface of the printing roll;
A cleaning means that partially faces a region of a predetermined length in the axial total length of the surface of the printing roll, and that cleans the partial length region of the rotating printing roll over the entire circumference,
Second support means for supporting the cleaning means movably along the axial direction of the printing roll;
Second drive means for moving the cleaning means supported by the second support means along the axial direction of the printing roll;
Detection means for detecting dirt adhering to the surface of the printing roll based on the captured image captured by the imaging means;
Position control means for operating the second drive means based on the detection result of the detection means to control the position of the cleaning means along the axial direction;
A printing roll cleaning apparatus comprising: Third support means for supporting the image pickup means so as to be movable along the axial direction of the printing roll; and third means for moving the image pickup means supported by the third support means along the axial direction of the print roll. Driving means,
The printing roll cleaning apparatus according to claim 1, wherein the image pickup unit picks up an image of a partial length region including the partial length region to be cleaned by the cleaning unit.   The printing roll cleaning apparatus according to claim 1 or 2, wherein the cleaning means is an ultrasonic cleaning apparatus, and a receiving container is provided below the printing roll for receiving a cleaning liquid supplied from the ultrasonic cleaning apparatus and passing down the roll surface. .

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