JP2007062031A - Blanket inspecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for inspecting a defect on the surface of a blanket under a condition that a pressure is loaded like when an actual printing is performed, and its inspecting apparatus. <P>SOLUTION: The blanket inspecting apparatus comprises: a platen 7 equipped with a transparent plate 6 capable of supporting the blanket 3 under a nip contacting condition and capable of observing a contacting condition between the blanket 3 and the transparent plate 6 through this transparent plate 6, a hydraulic cylinder 11 relatively pressing the blanket 3 and the transparent plate 6; and an inspecting means 9 which is arranged at a position facing the blanket 3 through the transparent plate 6, and when the blanket 3 and the transparent plate 6 are relatively pressed, the surface condition of the blanket 3 is inspected under a condition that the pressure is loaded on the blanket 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blanket inspection apparatus that applies an appropriate printing pressure to a blanket and inspects the surface of the blanket when the blanket is pressed against a plate as in actual printing.

  In general, in flat plate offset printing presses and intaglio offset printing presses, the pressure at the contact portion between the plate surface plate and the blanket or the pressure at the contact portion between the printing surface plate and the blanket, and the contact portion between the plate and the blanket or printed matter The nip width of the contact portion with the blanket is an important matter that affects the quality of the printed matter because it is related to the transfer and transfer of ink from the blanket to the printed matter. The relationship between pressure and nip width could not be measured. Similarly, regarding the defects on the blanket, it is not known how the defect shape changes under pressure. For example, as shown in Fig. 3, the blanket defect was a large pinhole in the non-pressurized state, but it became a small pinhole in the pressurized state. However, it may be difficult to predict from the defect state in the non-pressurized state.

  Thus, a method as shown in Patent Document 1 has been proposed for the relationship between the printing pressure and the nip width. However, when confirming whether a defect on the blanket is defective, the presence or absence of a printing defect has been confirmed by actually creating a printed matter. Also, it takes a lot of work to create an actual printed matter, and electronic parts printing and display-related material printing, especially color filter printing, are very expensive because the ink and the substrate are very expensive. In addition, the cost due to the consumption of these members has been a major problem.

Patent documents are as follows.
Japanese Patent Laid-Open No. 5-24182

  However, defects on the blanket and printed matter when transferred from the blanket to the printed matter due to differences in hardness, caliber of each blanket, thickness of the printing paper or printing substrate, or aging of the blanket itself, etc. The correlation of the way out was not always clear. In particular, blankets used for display-related materials such as electronic components such as printed wiring boards and color filters may cause problems depending on the shape even if they are very small. Since it is difficult to determine whether a printed product is a non-defective product or a defective product, it is very important to know the shape of the defect confirmed on the surface during printing.

  The blanket inspection apparatus according to the present invention has been made by paying attention to the above-mentioned problem, and how large the defect on the blanket when the printing pressure is not applied is when the printing pressure is applied. The purpose is to make it possible to inspect whether or not the defect is invisible, and eliminate the need for confirmation work with actual printed matter.

In order to achieve this object, a blanket inspection apparatus according to claim 1 of the present invention includes a transparent plate capable of supporting the blanket in a nip contact state, and observes the nip contact state between the blanket and the transparent plate through the transparent plate. A possible surface plate, a pressing means for relatively pressing the blanket and the transparent plate, and a position facing the blanket through the transparent plate, the blanket and the transparent plate being relatively A blanket inspection device comprising a blanket surface inspection means for pressing the blanket when pressed.

  The blanket inspection apparatus according to claim 2 of the present invention is the blanket inspection apparatus according to claim 1, further comprising pressure detection means for measuring the pressing force of the blanket when the blanket is pressed against the transparent plate. This is a featured blanket inspection device.

  A blanket inspection apparatus according to claim 3 of the present invention is the blanket inspection apparatus according to claim 1 or 2, wherein the inspection apparatus can scan in the width direction of the blanket and can perform surface inspection in the width direction. This is a blanket inspection device.

  A blanket inspection apparatus according to claim 4 of the present invention is the blanket inspection apparatus according to claims 1 to 3, wherein the blanket cylinder on which the blanket is mounted is rotatable, and the entire surface of the blanket is sequentially pressed. It is a blanket inspection device characterized by being capable of surface inspection.

  Further, the blanket inspection apparatus according to claim 5 of the present invention is the blanket inspection apparatus according to claims 1 to 4, wherein the inclination of the surface plate can be adjusted, and the film thickness distribution of the blanket is inclined. The blanket inspection apparatus is characterized in that the printing pressure applied to the blanket can always be constant.

A blanket inspection apparatus according to claim 6 of the present invention is the blanket inspection apparatus according to any one of claims 1 to 5, wherein a rotatable adhesive roller can be installed at a location facing the blanket cylinder on which the blanket is mounted. A blanket inspection device comprising a foreign matter removing device capable of removing foreign matter and the like on the surface of the blanket by pressing the adhesive roller against the blanket drum equipped with the blanket and rotating the blanket drum The blanket inspection apparatus according to claim 7 of the present invention is the blanket inspection apparatus according to any one of claims 1 to 6, wherein when a defect is found, marking is performed on the surface of the blanket to clarify the location of the defect. This is a blanket inspection device characterized in that it can be performed.

  A blanket inspection apparatus according to an eighth aspect of the present invention is the blanket inspection apparatus according to any one of the first to seventh aspects, wherein the blanket inspection apparatus is a defect inspection apparatus for a blanket for electronic component printing.

  A blanket inspection apparatus according to a ninth aspect of the present invention is the blanket inspection apparatus according to the first to seventh aspects, wherein the blanket inspection apparatus is a defect inspection apparatus for a color filter printing blanket.

  According to the blanket inspection apparatus of the present invention, it is possible to accurately detect the shape of the defect on the blanket in the pressed state, so that the influence of the defect on the printed matter can be accurately determined before actual printing. This makes it possible to make an appropriate non-defective blanket determination before printing. As a result, the confirmation work at the time of printing can be simplified, and therefore material loss at the time of printing is reduced.

  Hereinafter, the blanket inspection device of the present invention is explained based on a drawing.

  FIG. 1 shows a configuration of a blanket inspection apparatus according to the present embodiment. Reference numeral 1 denotes a blanket inspection apparatus. In the blanket inspection apparatus body 1, legs 8 a to 8 d as height-adjustable legs are arranged with respect to the frame 2, and a surface plate 6 is installed on the legs. The inclination state of the surface plate 6 is adjusted by the expansion and contraction of the height-adjustable feet 8a to 8d.

  An elongated opening 12 extending in the longitudinal direction of the surface plate 6 is opened at the center in the width direction of the surface plate 6. A transparent plate 6 that covers the opening 12 is disposed on the upper surface of the surface plate 6. Since the lower end portion of the blanket 3 is in contact with the upper portion of the transparent plate 6, the transparent plate 6 is constituted by a glass plate or the like having a strength that can resist the pressing force of the blanket 3.

  The blanket 3 is supported by a shaft 5a of an arm 5 suspended from a hydraulic cylinder 11 serving as a telescopic drive device supported by a frame at the upper part of the frame. The blanket 3 can be moved up and down by the expansion and contraction of the hydraulic cylinder 11, and can respond to the blanket 3 having a different thickness by the expansion and contraction of the hydraulic cylinder 11 and can also correspond to a blanket replacement operation.

  The blanket 3 is attached to the blanket cylinder 4, and the blanket cylinder 4 is supported by a shaft 5 a of an arm 5 that is fixed to a hydraulic cylinder 11 that is supported by an upper frame of the frame 2. It can rotate around the shaft 5a. The blanket 3 can be moved up and down by the expansion and contraction of the hydraulic cylinder 11a, and the blanket 3 having a different thickness can be accommodated by the expansion and contraction of the hydraulic cylinder 11a. In this embodiment, as shown in FIG. 2, a pair of hydraulic cylinders 11 a and 11 b are disposed at both left and right ends of the upper frame 2, and both ends of the blanket 3 can be applied to the transparent plate 6 with the same pressure. The blanket surface can be seen from the lower side of the transparent plate 6 through the transparent plate 6.

  Further, a pressure detection means 14 for detecting a pressing force acting on the arm 5 is provided at the tip of the hydraulic cylinder 11. The pressure detection means 14 is composed of, for example, a strain gauge, a piezoelectric element, or the like, and can measure the pressure detected during control when the blanket 3 is pressed against the transparent plate 6.

  Further, the hydraulic cylinder 11 is adjusted so that the pressure is the same between the hydraulic cylinders 11a and 11b so that the nip width between the bracket 3 and the transparent plate 6 is constant, and the nip width is adjusted to be uniform. I can do it. This work may be structured such that the hydraulic cylinder 11 and the pressure detection means 14 are interlocked with the control device, and the difference between the pressure data is fed back to the movement to the hydraulic cylinder so that both pressures are the same.

  An inspection device 9 for detecting a defect in a contact portion between the blanket 3 and the transparent plate 6 through the transparent plate 6 is installed in the opening 12 of the surface plate 7. The inspection device 9 includes a light source that irradiates light to a contact portion between the blanket 3 and the transparent plate 6 and a camera that detects light reflected from the blanket surface. As the light source and the camera, a general inspection apparatus for film inspection can be used. For example, a system similar to the apparatus described in JP-A-6-235624 can be used.

  Note that an illumination system that can select a desired illumination wavelength of monochromatic light such as a laser may be used as the illumination light source, or the accuracy of an image taken into the photoelectric conversion means may be improved through a polarizing filter.

  In the present embodiment, the inspection device 9 can be scanned in the width direction by, for example, a feeding device 11 including a screw rod and a guide rod so that inspection can be performed at each portion of the contact portion of the blanket 3 with the transparent plate.

  In this apparatus, it is possible to equip the blanket cylinder 4 with an adhesive roller 13 that can be crimped in a direction parallel to the axis 5a. It is assumed that the adhesive roller 13 can be pressed onto the blanket with a certain pressure. Further, the adhesive roller is configured to be able to rotate, so that the foreign material on the blanket 3 can be removed by rotating the adhesive roller or the blanket cylinder while being pressed against the blanket 3 mounted on the blanket cylinder 4. is there.

  The material of the adhesive roller may be an adhesive rubber roller, or may be an adhesive sheet that can be peeled in sequence. As the peelable pressure-sensitive adhesive sheet, a general sheet for floor cleaning or the like may be used.

  In this apparatus, the blanket cylinder 4 to which the blanket 3 is attached can detect a rotation angle that is a deviation from the origin from a place where the arm shaft 5a is located. Further, the inspection device 9 and the arm shaft 5a are connected to a control means (not shown), whereby the coordinates of the defect on the blanket can be specified when the inspection is performed. Further, it is possible to mark the defective portion on the blanket by transmitting the coordinate information to the marking device (not shown) on the defect coordinates on the blanket obtained by the control device and instructing the marking operation. Even if it is a case where a defect confirmation is performed visually after completion | finish of the blanket inspection in a press state by this marking, since a defect location is known immediately, confirmation becomes easier.

  As a marking method, marking may be performed so as to surround the defect with a soldering material, or a magical material may be used. For example, destruction such as a method of scratching with a knife or the like may be used. A method that makes the blanket unusable for printing, such as inspection, is not preferable.

  In addition, this invention is not restricted to said structure, The raising / lowering mechanism which inclines the blanket cylinder 4 is not restricted to the hydraulic cylinders 11a-11b, The combination mechanism of a rack and pinion and a motor, etc. may be sufficient.

The side view which showed schematic structure of the blanket inspection apparatus concerning the Example of this invention. The front view of the blanket inspection apparatus shown in FIG. It is a top view which shows the change by the presence or absence of the pressurization of the defect on a blanket.

Explanation of symbols

1. 1. Blanket inspection device Frame 3. Blanket4. 4. Blanket cylinder Arm 6. Transparent plate 7. Surface plate8. Height adjustable feet 9. Inspection equipment (lighting and sensors)
10. 10. Inspection apparatus movable table Hydraulic cylinder 12. Opening 13. Adhesive roller 14. Pressure detector

Claims (9)

  A transparent plate capable of supporting the blanket in a nip contact state, a surface plate capable of observing the nip contact state of the blanket and the transparent plate through the transparent plate, and a pressing means for relatively pressing the blanket and the transparent plate And a blanket surface inspection means that is disposed at a position facing the blanket through the transparent plate and that is pressed against the blanket when the blanket and the transparent plate are relatively pressed. Blanket inspection equipment   2. The blanket inspection apparatus according to claim 1, further comprising pressure detecting means for measuring a pressing force of the blanket when the blanket is pressed against the transparent plate.   3. The blanket inspection apparatus according to claim 1, wherein the inspection apparatus can scan in the width direction and can inspect surface defects on the nip between the blanket and the transparent plate.   4. The blanket inspection apparatus according to claim 1, wherein the blanket cylinder on which the blanket is mounted is rotatable, and the surface of the entire blanket can be successively inspected in a pressed state.   In the blanket inspection apparatus according to claims 1 to 4, the inclination of the blanket cylinder can be adjusted, and even if the film thickness distribution of the blanket is inclined, the printing pressure applied to the blanket can always be constant. Characteristic blanket inspection device   6. The blanket inspection apparatus according to claim 1, wherein a rotatable adhesive roller can be installed at a location opposite to the blanket cylinder on which the blanket is mounted, and the adhesive roller is pressed against the blanket cylinder on which the blanket is mounted. A blanket inspection device provided with a foreign matter removing device capable of removing foreign matter and the like on the surface of the blanket by rotating the barrel   7. The blanket inspection apparatus according to claim 1, wherein when a defect is found, marking for clarifying a place where the defect exists can be performed on the surface of the blanket.   8. The blanket inspection apparatus according to claim 1, wherein the blanket inspection apparatus is a blanket defect inspection apparatus for an electronic component printing blanket.   8. A blanket inspection apparatus according to claim 1, wherein the blanket inspection apparatus is a defect inspection apparatus for a color filter printing blanket.

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