JP6791422B2 - Printing press and printing press status monitoring method - Google Patents

Description

The present invention relates to a printing press and a method for monitoring the state of the printing press.

In the printing machine, the state of each component of the printing machine is grasped and an abnormality is monitored. In particular, since the printing pressure and printing pressure of an offset printing machine are directly linked to the transferability of ink, it is important to accurately grasp these states in order to ensure printing reproducibility.

In Patent Document 1, a detector provided outside the impression cylinder and the plate cylinder detects the core-to-core distance, which is the distance between the impression cylinder and the support shaft of the plate cylinder, to grasp the state of printing pressure. The technology to be used is described.

JP-A-2017-144617

The technique described in Patent Document 1 is accurate when the temperature of the plate cylinder or impression cylinder changes due to a change in atmospheric temperature or the like and thermal deformation such as thermal expansion or heat contraction occurs in the plate cylinder or impression cylinder. It is difficult to measure the printing pressure.

The present invention has been made in view of the above circumstances, and it is an example of a problem to solve the above-mentioned problems. That is, one example of the subject of the present invention is to accurately grasp the state of the printing machine and monitor the abnormality.

The printing machine according to the present invention has a plurality of mandrels for holding an object to be printed and an outer peripheral portion that can rotate around a support shaft, and rotates the plurality of mandrels provided along the circumferential direction of the outer peripheral portion. It is characterized by including a mandrel wheel to be operated and a mandrel distance sensor provided outside the mandrel wheel and measuring the distance to each of the plurality of mandrels.

Preferably, a printing plate mounted on the plate cylinder, a blanket for transferring the ink supplied to the printing plate to the printed matter, and a blanket wheel for rotating the blanket are further provided inside the blanket wheel. It is provided and is characterized by including a distance sensor for measuring the distance of the printing plate to the blanket wheel.

Preferably, a printing plate mounted on the plate cylinder, a blanket for transferring the ink supplied to the printing plate to the printed matter, and a blanket wheel for rotating the blanket are further provided inside the blanket wheel. It is provided and is characterized by including a temperature sensor for measuring the temperature of the printing plate.

Preferably, the mandrel distance sensor is characterized in that it makes a measurement when the printing press is stopped.

The state monitoring method of the printing machine according to the present invention has a plurality of mandrels for holding the object to be printed and a plurality of outer peripheral portions that can rotate around a support shaft, and are provided along the circumferential direction of the outer peripheral portion. a mandrel wheel which rotates the mandrel, is provided outside the front Symbol mandrel wheel, a condition monitoring method for a printing press comprising a mandrel distance sensor for measuring the distance between each of the plurality of said mandrel, wherein the mandrel distance It is characterized by including an acquisition step of acquiring a measurement result of measuring the distance to each of a plurality of the mandrel by a sensor.

Preferably, the printing machine further includes a printing plate mounted on the plate cylinder, a blanket for transferring the ink supplied to the printing plate to the printed matter, and a blanket wheel for rotating the blanket. The acquisition step is characterized in that the measurement result of measuring the distance of the printing plate to the blanket wheel by a distance sensor provided inside the blanket wheel is acquired.

Preferably, the printing machine further includes a printing plate mounted on the plate cylinder, a blanket for transferring the ink supplied to the printing plate to the printed matter, and a blanket wheel for rotating the blanket. The acquisition step is characterized in that the measurement result of measuring the temperature of the printing plate by a temperature sensor provided inside the blanket wheel is acquired.

Preferably, the mandrel distance sensor is characterized in that it makes a measurement when the printing press is stopped.

According to the present invention, it is possible to accurately grasp the state of the printing machine and monitor the abnormality.

It is a figure which shows typically the basic structure of the printing machine which concerns on this embodiment. FIG. 5 is an enlarged view of the vicinity of the area where the printing plate and the blanket shown in FIG. 1 come into contact with each other. It is a figure which shows the structure which the printing machine shown in FIG. 1 is prepared for grasping the state and monitoring an abnormality. It is a figure for demonstrating the arrangement structure of the distance sensor and the temperature sensor shown in FIG. It is a figure which shows the flow of the state monitoring process performed by the control device shown in FIG. It is a figure for demonstrating the calculation method of the push-in amount and gauge thickness which is an index which shows the state of a plate pressure. It is a figure which shows typically the structure of the printing machine provided with the printed matter temperature sensor and the mandrel temperature sensor.

The present invention is widely applicable to a printing machine that prints on a curved surface of a three-dimensional object such as a cylindrical object by using a printing plate and an intermediate transfer body. In the present embodiment, a case where the present invention is applied to an offset printing machine that prints on a curved surface of a container having a bottomed tubular shape such as a can, a bottle, and a bottle will be described as an example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below show some examples of the present invention and do not limit the contents of the present invention. Moreover, not all of the configurations and operations described in the embodiments are essential as the configurations and operations of the present invention.

[Basic configuration of printing machine]
FIG. 1 is a diagram schematically showing a basic configuration of a printing press 1 according to the present embodiment. FIG. 2 is an enlarged view of the vicinity of the area where the printing plate 14 and the blanket 25 shown in FIG. 1 come into contact with each other.

The printing machine 1 shown in FIG. 1 is a plate-type offset printing machine in which a can body having a substantially cylindrical shape such as a two-piece can is used as a printed matter P, and ink is transferred to the outer peripheral surface of the can body for printing. is there.

As shown in FIG. 1, the printing machine 1 includes an inking unit 10, a blanket wheel 20, a transport unit 30, a mandrel wheel 40, a burnish applicator 50, and a transfer unit 60.

The inking unit 10 is a device that supplies ink to the printing plate 14. The inking unit 10 is also referred to as an inker unit. The inking unit 10 is composed of a plurality of inking units 10 that are different for each color of ink. Each of the plurality of inking units 10 is arranged along the outer peripheral surface of the blanket wheel 20. The inking unit 10 includes an ink supply unit 11 for accommodating a predetermined ink, and a plate cylinder 13 on which a printing plate 14 corresponding to the predetermined ink is mounted.

As shown in FIG. 2, the ink supply unit 11 includes an ink roller group 12 composed of a fountain roller, a foam roller, and the like. The ink supply unit 11 supplies the ink contained in the ink storage unit (not shown) to the printing plate 14 mounted on the plate cylinder 13 by rotating each roller of the ink roller group 12. Temperature control water is circulated inside some of the rollers of the ink roller group 12, and the temperature of the ink is maintained appropriately.

The plate cylinder 13 has a substantially cylindrical shape that can rotate around a support shaft, and a printing plate 14 is detachably mounted on the outer peripheral surface thereof. The plate cylinder 13 is provided so that the distance to the blanket wheel 20 can be changed. The plate cylinder 13 is also referred to as a plate cylinder. In the printing plate 14, for example, a waterless lithographic plate in which a non-image area on which ink does not adhere is formed of a silicone resin layer or the like, or an image area portion on which ink is applied is formed of a photosensitive resin layer or the like. It is composed of resin letterpress. An outlet for blowing cold air is attached in the vicinity of the plate cylinder 13, so that the temperatures of the plate cylinder 13 and the printing plate 14 are properly maintained.

The blanket wheel 20 is a device that rotates the blanket 25 that makes rotational contact with each of the printed matter 14 and the printed matter P and transfers the ink supplied to the printed matter 14 to the printed matter P. As shown in FIG. 1, the blanket wheel 20 has a substantially cylindrical shape that can rotate around a support shaft 22. As shown in FIG. 2, a plurality of segments 21 are provided on the outer peripheral surface of the blanket wheel 20 at predetermined intervals along the circumferential direction of the blanket wheel 20. A blanket 25 is attached to the outer surface of each of the plurality of segments 21. In the printing press 1 shown in FIG. 1, twelve blankets 25 are mounted on the segment 21.

The blanket 25 is an intermediate transfer body that mediates the transfer of ink from the printing plate 14 to the printed matter P. The blanket 25 includes a base material layer made of a woven fabric and a foam, and a rubber layer made of acrylonitrile butadiene rubber or the like. The base material layer is detachably attached to the outer surface of the segment 21 via an adhesive or the like. The rubber layer is a layer on which the ink is transferred on the printing plate 14, and is arranged on the outer surface of the base material layer to form the outer surface of the blanket 25.

The transport unit 30 is a device that transports the printed matter P before printing to the mandrel wheel 40. The transport unit 30 is provided above the mandrel wheel 40, as shown in FIG. The transport unit 30 is provided on the upstream side in the rotation direction of the mandrel wheel 40 with respect to the area where the printed matter P held by the mandrel 41 and the blanket 25 come into contact with each other. The transfer unit 30 sequentially conveys the printed matter P one by one from above the mandrel wheel 40 to the upper part of the mandrel wheel 40 by the gravity of the printed matter P.

The mandrel wheel 40 is a device that rotates the mandrel 41 that holds the printed matter P. The mandrel wheels 40 are provided adjacent to each other in the radial direction of the blanket wheel 20. The mandrel wheel 40 has a substantially disk shape that can rotate around a support shaft. A plurality of mandrel 41s are provided on the outer peripheral portion of the mandrel wheel 40 at predetermined intervals along the circumferential direction of the mandrel wheel 40.

The mandrel 41 has a substantially cylindrical shape that can be inserted into the can body, which is the printed matter P. A plurality of mandrel 41s are provided so as to project in a direction intersecting the mandrel wheel 40, and are cantilevered and supported on the outer peripheral portion of the mandrel wheel 40. The number of mandrels 41 is preferably an integral multiple of the number of blankets 25. In the printing press 1 shown in FIG. 1, 24 mandrel 41s are provided on the mandrel wheel 40.

The mandrel 41 holds the printed matter P by adsorbing the inner surface of the bottom of the can body whose tip is the printed matter P by air suction or the like. The mandrel 41 is provided so that its posture can be changed, and the position of the mandrel wheel 40 in the radial direction can be changed. The mandrel 41 is rotatably provided around the central axis of the mandrel 41 while holding the printed matter P.

The burnish applicator 50 is an apparatus for applying an overcoat such as a finishing varnish to the printed matter P to which the ink has been transferred. The burnish applicator 50 is provided adjacent to each other in the radial direction of the mandrel wheel 40. The burnish applicator 50 is provided on the downstream side in the rotational direction of the mandrel wheel 40 with respect to the area where the printed matter P held by the mandrel 41 and the blanket 25 come into contact with each other.

The transfer unit 60 is a device that transfers the printed matter P that has passed through the burnish applicator 50 from the mandrel 41 and transfers the ink, the overcoat, and the like to a drying device such as an oven that fixes the ink and the overcoat on the printed matter P. The transfer units 60 are provided adjacent to each other in the radial direction of the mandrel wheel 40. The transfer unit 60 is provided on the downstream side in the rotational direction of the mandrel wheel 40 with respect to the area where the printed matter P held by the mandrel 41 and the burnish applicator 50 come into contact with each other.

[Printing operation of printing machine]
The printing operation of the printing machine 1 on the printed matter P will be described. The printing machine 1 conveys the printed matter P to the upper part of the mandrel wheel 40 by the conveying unit 30. The printing machine 1 holds the printed matter P conveyed to the upper part of the mandrel wheel 40 by the mandrel 41. Before the printed matter P comes into contact with the blanket 25, the printing machine 1 rotates the mandrel 41 to press-pin the printed matter P, and rotates the mandrel wheel 40 to bring the printed matter P into the contact area with the blanket 25. Move. That is, the printed matter P rotates by the rotation of the mandrel 41 and revolves by the rotation of the mandrel wheel 40.

Further, the printing machine 1 rotates the ink roller group 12 to supply the ink contained in the ink supply unit 11 to the printing plate 14 mounted on the plate cylinder 13. The printing plate 14 to which the ink is supplied moves to the contact area between the printing plate 14 and the blanket 25 by the rotation of the plate cylinder 13. The printing machine 1 rotates the blanket wheel 20 to bring the blanket 25 into contact with the printing plate 14 to which the ink is supplied, and transfers the ink supplied to the printing plate 14 to the blanket 25. As a result, the image corresponding to the pattern of the image line portion formed on the printing plate 14 is transferred to the blanket 25.

The blanket 25 to which the ink is transferred moves to the contact area between the printed matter P and the blanket 25 by the rotation of the blanket wheel 20. The blanket 25 that has moved to the contact region contacts the printed matter P while pressing the printed matter P held by the mandrel 41, and transfers the ink transferred to the blanket 25 to the printed matter P. As a result, the image corresponding to the pattern of the image line portion formed on the printing plate 14 is transferred to the printed matter P via the blanket 25.

The printed matter P to which the ink is transferred moves to the burnish applicator 50 and moves to the transfer unit 60 by the rotation of the mandrel wheel 40. The printing machine 1 operates the burnish applicator 50 to apply an overcoat to the printed matter P to which the ink has been transferred. Further, the printing machine 1 operates the transfer unit 60 to transfer the printed matter P that has passed through the burnish applicator 50 from the mandrel 41 and transfer it to a drying device such as an oven.

The printing machine 1 rotates the plate cylinder 13, the blanket wheel 20, the mandrel 41, and the mandrel wheel 40 in synchronization with each other. In addition, the printing machine 1 also operates the burnish applicator 50 and the transfer unit 60 in synchronization with their rotations. By such an operation, the printing machine 1 prints on the printed matter P.

[Configuration related to status monitoring of printing press]
FIG. 3 is a diagram showing a configuration in which the printing press 1 shown in FIG. 1 is provided for grasping the state and monitoring an abnormality. FIG. 4 is a diagram for explaining the arrangement configuration of the distance sensor 71 and the temperature sensor 75 shown in FIG.

The printing machine 1 can grasp the state of each component of the printing machine 1 as described above and monitor the abnormality. Specifically, the printing press 1 collects, visualizes, and evaluates information indicating the state of each component of the printing press 1, which is important for ensuring print reproducibility, so that each of the printing presses 1 is evaluated. It is possible to determine whether or not the components are operating in an appropriate state.

Information indicating the state of each component of the printing machine 1 that is important for ensuring print reproducibility includes plate pressure, printing pressure, plate surface temperature, atmospheric temperature and humidity of the printing machine 1, and temperature of the printed matter P (can). Temperature), the temperature of the mandrel 41, the position of the mandrel 41, the temperature of the ink roller group 12, and the like. The plate pressure is the pressure generated by the contact between the plate surface, which is the outer surface of the printing plate 14, and the outer surface of the blanket 25. The printing pressure is the pressure generated by the contact between the surface of the printed matter P and the outer surface of the blanket 25. The plate surface temperature is the temperature of the plate surface, which is the surface of the printing plate 14. The atmospheric temperature and humidity of the printing machine 1 include the temperature and humidity above and below the blanket wheel 20, and the temperature and humidity of the transport unit 30. The position of the mandrel 41 is the relative position of each mandrel 41 in the radial direction of the mandrel wheel 40.

Among the above-mentioned information indicating the state of each component of the printing machine 1, the printing pressure and the printing pressure are the transferability of the ink from the printing plate 14 to the blanket 25 and the transferability of the ink from the blanket 25 to the printed matter P. It is especially important because it is directly connected to. The printing press 1 according to the present embodiment is configured to collect, visualize, and evaluate information on plate pressure and printing pressure.

Specifically, as shown in FIGS. 3 and 4, the printing machine 1 includes a distance sensor 71, a slip ring 74, a temperature sensor 75, a mandrel distance sensor 76, a control device 80, and a display device 91. And a communication device 92.

The distance sensor 71 is a sensor that measures the distance of the printing plate 14 to the blanket wheel 20. The distance of the printing plate 14 to the blanket wheel 20 is the distance of the printing plate 14 to the blanket wheel 20, and indicates the relative position of the printing plate 14 in the radial direction of the blanket wheel 20.

The distance of the printing plate 14 to the blanket wheel 20 has a correlation with the plate pressure. The shorter the distance of the printing plate 14 to the blanket wheel 20, the greater the force with which the printing plate 14 presses the blanket 25 inward in the radial direction of the blanket wheel 20, so that the plate pressure increases. The longer the distance of the printing plate 14 to the blanket wheel 20, the smaller the force with which the printing plate 14 presses the blanket 25 inward in the radial direction of the blanket wheel 20, so that the plate pressure becomes smaller.

The distance sensor 71 is a non-contact type sensor, and is composed of a reflection type displacement sensor or the like using a laser beam. Specifically, as shown in FIG. 4, the distance sensor 71 includes a head 72 having a light emitting portion and a light receiving portion of laser light, and an amplifier 73 for amplifying the laser light received by the head 72. Laser.

One distance sensor 71 is provided inside the blanket wheel 20. Specifically, the head 72 is arranged between the plurality of segments 21 of the blanket wheel 20 and is arranged in a posture facing outward in the radial direction of the blanket wheel 20. The amplifier 73 is arranged between the segment 21 of the blanket wheel 20 and the support shaft 22. For example, the amplifier 73 may be attached to the outer surface of the bearing 23 that rotatably supports the support shaft 22 or to the spokes 24 near the bearing 23. The distance sensor 71 measures the distance to each of the blanket wheels 20 of the plurality of printing plates 14 provided for each ink color while rotating integrally with the blanket wheel 20.

Further, since the distance sensor 71 is provided inside the blanket wheel 20 and rotates integrally with the blanket wheel 20, the distance of the printed matter P held by the mandrel 41 to the blanket wheel 20 can be measured. Since the number of mandrel 41 is an integral multiple of the blanket 25, the distance sensor 71 measures the distance of the printed material P held by the specific mandrel 41 to the blanket wheel 20 each time the mandrel wheel 40 makes one rotation. The distance of the printed matter P to the blanket wheel 20 is the distance of the outer peripheral surface of the printed matter P to the blanket wheel 20, and indicates the relative position of the printed matter P in the radial direction of the blanket wheel 20.

The distance of the printed matter P with respect to the blanket wheel 20 has a correlation with the printing pressure. The shorter the distance of the printed matter P to the blanket wheel 20, the greater the force with which the blanket 25 presses the printed matter P outward in the radial direction of the blanket wheel 20, so that the printing pressure increases. As the distance of the printed matter P with respect to the blanket wheel 20 becomes longer, the force with which the blanket 25 presses the printed matter P outward in the radial direction of the blanket wheel 20 becomes smaller, so that the printing pressure becomes smaller.

Further, the distance sensor 71 is wiredly connected to the control device 80 via the slip ring 74. Specifically, the head 72 is wiredly connected to the amplifier 73 by a cable or the like. The amplifier 73 is wiredly connected to the control device 80 provided outside the blanket wheel 20 via a slip ring 74 by a cable or the like. The thick solid line in FIG. 4 indicates the cable.

The temperature sensor 75 is a sensor that measures the temperature of the printing plate 14. The temperature of the printing plate 14 measured by the temperature sensor 75 is the plate surface temperature of the printing plate 14. The plate surface temperature of the printing plate 14 has a correlation with the ink temperature. When the plate surface temperature of the printing plate 14 changes, the temperature of the ink changes. When the temperature of the ink changes, the viscosity of the ink changes, causing printing defects such as blurring of the ink, bleeding of the ink, background stain of the printed matter P due to scattering of the ink, or turbidity of the ink.

The temperature sensor 75 is a non-contact type sensor and is composed of a radiation thermometer or the like. As shown in FIG. 4, one temperature sensor 75 is provided inside the blanket wheel 20 like the distance sensor 71. Specifically, the temperature sensor 75 is arranged between the plurality of segments 21 of the blanket wheel 20 and is arranged in a posture facing outward in the radial direction of the blanket wheel 20. The temperature sensor 75 is wiredly connected to the control device 80 via the slip ring 74. The temperature sensor 75 measures the plate surface temperature of each of the plurality of printing plates 14 provided for each ink color while rotating integrally with the blanket wheel 20.

The mandrel distance sensor 76 is a sensor provided outside the mandrel wheel 40 and measures the distance to the mandrel 41. The mandrel distance sensor 76 is provided above the mandrel wheel 40, as shown in FIG. The mandrel distance sensor 76 is a non-contact type sensor, and is composed of a reflection type displacement sensor or the like using a laser beam.

The distance measured by the mandrel distance sensor 76 indicates the relative position of the individual mandrel 41 in the radial direction of the mandrel wheel 40. If the position of the mandrel 41 varies among the plurality of mandrel 41 provided on the mandrel wheel 40, the position of the printed matter P held by each of the plurality of mandrel 41 varies. As a result, the distance of the printed matter P with respect to the blanket wheel 20 varies from printed matter P to printed matter P, and the printing pressure varies from printed matter P to printed matter P. The printing machine 1 measures the variation in the relative position of the other mandrel 41 with respect to one mandrel 41, which is a predetermined reference, and if the mandrel 41 exceeding the allowable range of variation is specified, it is specified. The position of the mandrel 41 is adjusted as appropriate. The measurement by the mandrel distance sensor 76 is performed when the operation of the printing press 1 is stopped, that is, when the printing press 1 is adjusted.

The control device 80 is a device that comprehensively controls each component of the printing machine 1. The control device 80 includes a processor and a storage device, and is configured by a PLC (Programmable Logic Controller) including a program that implements the functions of the printing machine 1. The control device 80 grasps the state of each component of the printing machine 1 based on the measurement result of each sensor provided in the printing machine 1 and monitors the abnormality. In the present embodiment, the process performed by the control device 80 for grasping the state of each component of the printing machine 1 and monitoring the abnormality is also referred to as “state monitoring process”. In the present embodiment, a method of grasping the state of the printing press 1 and monitoring an abnormality by performing a state monitoring process is also referred to as a “state monitoring method”. The details of the state monitoring process will be described later with reference to FIG.

The display device 91 is composed of a display device such as a display or a personal digital assistant. The display device 91 displays the measurement results and the like of each sensor provided in the printing machine 1 in response to a command from the control device 80.

The communication device 92 is composed of a wireless or wired communication module provided integrally with the control device 80. The communication device 92 transmits the measurement results of each sensor provided in the printing machine 1 to an external production management device in response to a command from the control device 80. The production control device is a device that centrally manages the operating state of a plurality of printing machines 1 at a place away from the printing machine 1.

[Status monitoring process]
FIG. 5 is a diagram showing a flow of a state monitoring process performed by the control device 80 shown in FIG. FIG. 6 is a diagram for explaining a method of calculating the pressing amount X and the gauge thickness Y, which are indexes indicating the state of the plate pressure. FIG. 6A is a diagram when the printing plate 14 is made of a resin letterpress. FIG. 6B is a diagram when the printing plate 14 is composed of a waterless planographic plate.

The state monitoring process is a process for grasping the state of each component of the printing machine 1 and monitoring an abnormality. The control device 80 performs a state monitoring process in real time when the printing machine 1 is in operation, that is, when the printing machine 1 prints on the printed matter P. However, depending on the type of information indicating the state of each component of the printing machine 1, the control device 80 performs a state monitoring process when the operation of the printing machine 1 is stopped, that is, when the printing machine 1 is adjusted. Do.

For example, when the information indicating the state of each component of the printing machine 1 is the printing pressure and the printing pressure, the control device 80 performs the state monitoring process related to the printing pressure and the printing pressure when the printing machine 1 is operated. On the other hand, when the information indicating the state of each component of the printing machine 1 is the position of the mandrel 41, the control device 80 performs the state monitoring process regarding the position of the mandrel 41 when the operation of the printing machine 1 is stopped. .. The control device 80 may perform the state monitoring process related to the printing pressure when the operation of the printing machine 1 is stopped.

FIG. 5 describes a state monitoring process related to printing pressure and printing pressure, which is particularly important among the information indicating the state of each component of the printing press 1.

In step 501, the control device 80 causes each sensor provided in the printing machine 1 called the distance sensor 71 and the temperature sensor 75 to execute the measurement, and acquires the measurement result. The measurement result of the distance sensor 71 includes the respective distances of the plurality of printed plates 14 with respect to the blanket wheel 20 and the distance of the printed matter P with respect to the blanket wheel 20. The respective distances of the plurality of printing plates 14 with respect to the blanket wheel 20 indicate the state of the respective plate pressures of the plurality of printing plates 14. The distance of the printed matter P with respect to the blanket wheel 20 indicates the state of printing pressure. The measurement result of the temperature sensor 75 is the plate surface temperature of each of the plurality of printing plates 14.

Here, the measurement result of the distance sensor 71 indicating the distance of the printing plate 14 to the blanket wheel 20 indicates the state of the plate pressure, but the control device 80 more accurately indicates the state of the plate pressure as the indentation amount X and The gauge thickness Y can be calculated. The pushing amount X is the amount at which the blanket 25 is pushed by the contact between the printing plate 14 and the blanket 25. The gauge thickness Y is the distance between the bearer portion 15 of the printing plate 14 and the outer surface of the segment 21. The bearer portion 15 is a ring-shaped member provided at both ends of the plate cylinder 13, and is a body pillow of the plate cylinder 13. The gauge thickness Y corresponds to the distance of the printing plate 14 to the blanket wheel 20 described above. The control device 80 calculates the pushing amount X and the gauge thickness Y using the measurement result of the distance sensor 71 indicating the distance of the printing plate 14 to the blanket wheel 20.

As shown in FIG. 6A, when the printing plate 14 is made of a resin letterpress, the control device 80 calculates the pushing amount X and the gauge thickness Y by the following calculation method. The engraving depth of the printing plate 14 is D, the measured value of the distance sensor 71 is L0, the reference distance which is the distance between the head 72 of the distance sensor 71 and the outer surface of the segment 21 is L1, and the thickness of the blanket 25 is TBL. And. At this time, the control device 80 calculates the push-in amount X and the gauge thickness Y by using the following equations.
X = (D + TBL + L1) -L0
Y = L0- (D + L1)

As shown in FIG. 6B, when the printing plate 14 is composed of a waterless planographic plate, the control device 80 calculates the pressing amount X and the gauge thickness Y using the following equations.
X = (TBL + L1) -L0
Y = L0-L1

As described above, the control device 80 can acquire not only the measured value of the distance sensor 71 but also the push-in amount X and the gauge thickness Y as the measurement result of the distance sensor 71. Therefore, even if the type of the printing plate 14 and the thickness of the blanket 25 are changed, the control device 80 can grasp the accurate plate pressure state reflecting the changes. When the operator manually grasps the state of the plate pressure, the gauge thickness Y is measured using a feeler gauge. When adjusting the printing press 1, the gauge thickness Y obtained from the measured value of the distance sensor 71 is compared with the manually measured gauge thickness Y, and a correction value is added to the measured value of the distance sensor 71 as necessary. You can also do it.

In step 502, the control device 80 causes the display device 91 to display the measurement results of the distance sensor 71 and the temperature sensor 75 acquired in step 501. As a result, the control device 80 can visualize the state of the plate pressure, the printing pressure, and the plate surface temperature of the printing plate 14 in real time. In the printing press 1, the distance (printing pressure) of the printed matter P to the blanket wheel 20 can be measured at all times while the printing press 1 is in operation, but it is periodically measured in order to measure with higher accuracy. The operation of the printing machine 1 may be stopped and the measurement may be performed.

In step 503, the control device 80 evaluates the measurement result acquired in step 501 and determines whether or not the measurement result is within the permissible range. Thereby, the control device 80 can determine whether or not the printing machine 1 is operating in a state where the plate pressure, the printing pressure, and the plate surface temperature of the printing plate 14 are appropriate. The permissible range is a range of numerical values in which the difference between the preset reference value and the measurement result can be tolerated. The reference value and the allowable range can be changed depending on the type of the printed matter P, the type of the printing plate 14, the content of the printed image, and the like. If the measurement result is within the permissible range, the control device 80 shifts to step 505. If the measurement result is not within the permissible range, the control device 80 proceeds to step 504. In the printing press 1, the operator can also make the judgment in step 503, and when the measurement result is out of the permissible range, or when a significant change is observed even if the measurement result is within the permissible range. Can allow the operator to immediately perform the adjustment work of the printing machine 1.

In step 504, the control device 80 issues an alarm. For example, the control device 80 causes the display device 91 to display an alarm, turn on a warning light, or emit a warning sound. As a result, the control device 80 can immediately notify the operator when the plate pressure, the printing pressure, and the plate surface temperature of the printing plate 14 are not in an appropriate state. The operator can immediately perform the adjustment work of the printing machine 1 in response to the alarm. Alternatively, the printing machine 1 can automatically perform the adjustment work of the printing machine 1.

In step 505, the control device 80 causes the communication device 92 to transmit the measurement result acquired in step 501 and the result evaluated and determined in step 503 to the external production control device. As a result, the external production management device can manage the state of the printing press 1 in real time. After that, the control device 80 ends this process.

In the description of FIG. 5, the state monitoring process relating to the plate pressure and the printing pressure has been described, but the state monitoring process relating to the position of the mandrel 41 is performed by the control device 80 as follows.

When the operation of the printing machine 1 is stopped, the control device 80 acquires the measurement result of the mandrel distance sensor 76 based on the operation of the operator (step 501) and displays the measurement result on the display device 91 (step 502). ). The measurement target of the mandrel distance sensor 76 is a plurality of mandrel 41s provided on the mandrel wheel 40. The measurement result of the mandrel distance sensor 76 shows the relative positions of the plurality of mandrel 41s in the radial direction of the mandrel wheel 40. The control device 80 determines whether or not the relative positions of the other plurality of mandrel 41 with respect to one mandrel 41, which is a predetermined reference, are within an allowable range (step 503). Then, the control device 80 issues an alarm if the relative positions of the plurality of mandrel 41s are not within the permissible range (step 504). In response to the alarm, the operator can identify the mandrel 41 determined to be out of the permissible range and immediately adjust the relative position of the identified mandrel 41. Then, the control device 80 transmits the measurement result indicating the relative position of each of the plurality of mandrel 41 and the evaluation and determination result from the communication device 92 to the external production control device (step 505).

[Action effect]
As described above, in the printing machine 1, a distance sensor 71 for measuring the distance of the printing plate 14 to the blanket wheel 20 and a temperature sensor 75 for measuring the temperature of the printing plate 14 are provided inside the blanket wheel 20. As a result, the distance sensor 71 can accurately measure the distance of the printing plate 14 to the blanket wheel 20 even if the blanket wheel 20 or the plate cylinder 13 is thermally deformed.

When the distance sensor is provided outside the blanket wheel to measure the plate pressure, it is difficult to make an accurate measurement. In particular, when the distance sensor measures the distance between the support shafts of the blanket wheel and the plate cylinder, it is difficult to measure in consideration of the influence of the dimensional change due to the thermal deformation of the blanket wheel or the plate cylinder.

On the other hand, since the distance sensor 71 is provided inside the blanket wheel 20, the printing plate 14 with respect to the blanket wheel 20 reflects the influence of the dimensional change due to the thermal deformation of the blanket wheel 20 or the plate cylinder 13. The distance can be measured. Therefore, the distance sensor 71 can accurately measure the distance of the printing plate 14 to the blanket wheel 20. Therefore, the printing machine 1 can accurately grasp the state of the plate pressure and monitor the abnormality.

Further, since the distance sensor 71 and the temperature sensor 75 are provided inside the blanket wheel 20, they rotate integrally with the blanket wheel 20. Therefore, the distance sensor 71 and the temperature sensor 75 can measure the distance and the plate surface temperature of the printing plate 14 in each of the plurality of inking units 10 with one sensor. As a result, it is not necessary to provide a large number of distance sensors 71 and temperature sensors 75 in the printing machine 1, and the distance and plate surface of the printing plate 14 to the blanket wheel 20 at the timing when the ink is transferred from the printing plate 14 to the blanket 25. The temperature can be measured. Therefore, the printing machine 1 can quickly and accurately grasp the state of the plate pressure and the plate surface temperature of the printing plate 14 with a simple configuration, and can monitor the abnormality.

Further, since the distance sensor 71 is provided inside the blanket wheel 20 and rotates integrally with the blanket wheel 20, the distance of the printed matter P held by the mandrel 41 to the blanket wheel 20 can be measured. Therefore, the printing machine 1 can use the distance of the printing plate 14 with respect to the blanket wheel 20 and the distance of the printed matter P with respect to the blanket wheel 20 in one distance sensor 71. Therefore, the printing machine 1 can accurately grasp the state of the plate pressure and the printing pressure with a simple configuration and monitor the abnormality.

Further, the distance sensor 71 and the temperature sensor 75 are composed of a non-contact type sensor. Therefore, the distance sensor 71 does not require processing for each of the plurality of blankets 25 as compared with the case where the plate pressure and the printing pressure are measured by a contact type sensor such as a strain gauge. Compared with the case where the temperature sensor 75 measures the temperature with a contact type sensor such as a thermoelectric pair, the temperature sensor 75 does not need to be processed into a plate cylinder 13 or a printing plate 14. Therefore, the printing machine 1 can accurately grasp the state of the plate pressure, the printing pressure, and the plate surface temperature of the printing plate 14 with a simple configuration and monitor the abnormality while suppressing the work load and the cost.

Further, the distance sensor 71 and the temperature sensor 75 are wiredly connected to the control device 80 via the slip ring 74. That is, in the printing machine 1, there is no concern that the cable or the like connecting the distance sensor 71 and the temperature sensor 75 and the control device 80 will be disconnected, and the distance sensor 71 and the temperature sensor 75 and the control device 80 can be connected by wire. Therefore, in the printing machine 1, it is possible to suppress the superimposition of noise on the measurement result transmitted to the control device 80 as compared with the case of wireless connection, so that an accurate measurement result can be obtained. In addition, the printing machine 1 can shorten the transmission time of the measurement result to the control device 80 and improve the transmission stability as compared with the case of the wireless connection, so that the measurement result can be quickly and quickly transmitted. It can be obtained stably. Therefore, the accurate state of the plate pressure, the printing pressure, and the plate surface temperature of the printing plate 14 can be grasped quickly and stably, and the abnormality can be monitored.

Further, the printing machine 1 is provided outside the mandrel wheel 40 and includes a mandrel distance sensor 76 that measures the distance from the mandrel 41. Therefore, the printing machine 1 can quickly and easily measure the relative positions of the plurality of mandrel 41s in the radial direction of the mandrel wheel 40. Then, the printing machine 1 can identify the mandrel 41 whose relative position of the mandrel 41 is not within the permissible range and can adjust it quickly, so that it is possible to suppress the variation in printing pressure. Moreover, the printing machine 1 measures the mandrel distance sensor 76 when the operation of the printing machine 1 is stopped. Therefore, the printing machine 1 can accurately measure the relative positions of the plurality of mandrel 41s in the radial direction of the mandrel wheel 40, as compared with the case where the measurement is performed while the printing machine 1 is in operation. .. Therefore, the printing machine 1 can accurately grasp the state of the position of the mandrel 41.

[Other Embodiments]
FIG. 7 is a diagram schematically showing the configuration of a printing machine 1 provided with a printed matter temperature sensor 77 and a mandrel temperature sensor 78.

In the printing machine 1, in addition to the temperature sensor 75 that measures the plate surface temperature of the printing plate 14, the printed matter temperature sensor 77 that measures the temperature of the printed matter P held by the mandrel 41 and the mandrel that measures the temperature of the mandrel 41 A temperature sensor 78 can be provided.

The printed matter temperature sensor 77 and the mandrel temperature sensor 78 are non-contact type sensors, respectively, and are composed of a radiation thermometer and the like. The printed matter temperature sensor 77 is provided outside the mandrel wheel 40, within a range from the region where the printed matter P is inserted into the mandrel 41 to the region where the printed matter P comes into contact with the blanket 25. The mandrel temperature sensor 78 is provided outside the mandrel wheel 40 in a region where the printed matter P is not inserted into the mandrel 41.

The temperature of the mandrel 41 affects the temperature of the printed matter P held by the mandrel 41. The temperature of the printed matter P has a correlation with the temperature of the ink transferred to the printed matter P. When the temperature of the printed matter P changes, the temperature of the ink when transferred from the blanket 25 to the printed matter P changes. When the temperature of the ink changes, the viscosity of the ink changes, causing printing defects such as blurring of the ink, bleeding of the ink, background stain of the printed matter P due to scattering of the ink, or turbidity of the ink.

In addition to the plate surface temperature of the printing plate 14, the printing machine 1 can also measure the temperature of the mandrel 41 and the temperature of the printed matter P held by the mandrel 41. Therefore, in the printing machine 1, not only the plate pressure, the printing pressure, and the plate surface temperature of the printing plate 14 but also the temperature of the mandrel 41 and the printed matter P, which are important for ensuring the reproducibility of printing, It is possible to accurately grasp the temperature state and monitor abnormalities.

In the above-described embodiment, the printing press 1 includes both the distance sensor 71 and the temperature sensor 75, but may include only one of the distance sensor 71 or the temperature sensor 75. That is, the printing machine 1 may include at least one of the distance sensor 71 and the temperature sensor 75. Then, the printing machine 1 may cause the distance sensor 71 and / or the temperature sensor 75 to perform the measurement, and determine whether or not the measurement result is within the permissible range. As a result, the printing machine 1 can accurately grasp the state of the plate pressure and the printing pressure of the printing machine 1 and / or the state of the plate surface temperature of the printing plate 14, and monitor the abnormality.

[Other]
In the above-described embodiment, the printing machine 1 corresponds to an example of the "printing machine" described in the claims. The plate cylinder 13 corresponds to an example of the "plate cylinder" described in the claims. The print plate 14 corresponds to an example of the "print plate" described in the claims. The blanket wheel 20 corresponds to an example of the "blanket wheel" described in the claims. The blanket 25 corresponds to an example of the "blanket" described in the claims. The mandrel wheel 40 corresponds to an example of the "mandrel wheel" described in the claims. Mandrel 41 corresponds to an example of the "mandrel" described in the claims. The distance sensor 71 corresponds to an example of the “distance sensor” described in the claims. The slip ring 74 corresponds to an example of the "slip ring" described in the claims. The temperature sensor 75 corresponds to an example of the “temperature sensor” described in the claims. The mandrel distance sensor 76 corresponds to an example of the “mandrel distance sensor” described in the claims. The control device 80 corresponds to an example of the “control device” described in the claims. The printed matter P corresponds to an example of the “printed matter” described in the claims. Step 501 corresponds to an example of the "acquisition process" described in the claims.

In the above-described embodiments, the techniques can be applied to each other, including modifications. The above-described embodiment does not limit the content of the present invention, and changes can be made without departing from the scope of claims.

The terms used in the above embodiments and claims should be construed as non-limiting terms. For example, the term "contains" should be construed as "not limited to what is described as including." The term "contains" should be construed as "not limited to what is described as containing." The term "prepared" should be construed as "not limited to what is described as prepared." The term "have" should be construed as "not limited to what is described as having."

1 Printing machine 10 Inking unit 11 Ink supply unit 12 Ink roller group 13 Plate cylinder 14 Printing plate 15 Bearer part 20 Blanket wheel 21 Segment 22 Support shaft 23 Bearing 24 Spoke 25 Blanket 30 Conveyance unit 40 Mandrel wheel 41 Mandrel 50 Burnish application Bearing unit 71 Distance sensor 72 Head 73 Amplifier 74 Slip ring 75 Temperature sensor 76 Mandrel distance sensor 77 Printed matter temperature sensor 78 Mandrel temperature sensor 80 Control device 91 Display device 92 Communication device D Engraving depth L0 Measured value L1 Reference distance P Printed matter TBL blanket thickness X Push-in amount Y Gauge thickness

Claims (8)

With multiple mandrels holding the printed matter,
A mandrel wheel that has an outer peripheral portion that can rotate around a support shaft and that rotates a plurality of the mandrels provided along the circumferential direction of the outer peripheral portion .
A printing machine provided outside the mandrel wheel and provided with a mandrel distance sensor that measures a distance from each of the plurality of mandrels. The printing plate attached to the plate cylinder and
A blanket that transfers the ink supplied to the printing plate to the printed matter, and
A blanket wheel that rotates the blanket and
With more
The printing machine according to claim 1, further comprising a distance sensor provided inside the blanket wheel and measuring the distance of the printing plate to the blanket wheel. The printing plate attached to the plate cylinder and
A blanket that transfers the ink supplied to the printing plate to the printed matter, and
A blanket wheel that rotates the blanket and
With more
The printing machine according to claim 1 or 2, further comprising a temperature sensor provided inside the blanket wheel and measuring the temperature of the printing plate. The printing machine according to any one of claims 1 to 3, wherein the mandrel distance sensor makes a measurement when the operation of the printing machine is stopped. With multiple mandrels holding the printed matter,
A mandrel wheel that has an outer peripheral portion that can rotate around a support shaft and that rotates a plurality of the mandrels provided along the circumferential direction of the outer peripheral portion .
It provided outside the front Symbol mandrel wheel, and the mandrel a distance sensor for measuring a distance between each of the plurality of said mandrel,
It is a condition monitoring method of a printing machine equipped with
A method for monitoring a state of a printing press, which comprises an acquisition step of acquiring a measurement result obtained by measuring a distance to each of a plurality of the mandrels by the mandrel distance sensor. The printing machine
The printing plate attached to the plate cylinder and
A blanket that transfers the ink supplied to the printing plate to the printed matter, and
A blanket wheel that rotates the blanket and
With more
The state of the printing press according to claim 5, wherein in the acquisition step, a measurement result of measuring the distance of the printing plate to the blanket wheel by a distance sensor provided inside the blanket wheel is acquired. Monitoring method. The printing machine
The printing plate attached to the plate cylinder and
A blanket that transfers the ink supplied to the printing plate to the printed matter, and
A blanket wheel that rotates the blanket and
With more
The method for monitoring the state of a printing press according to claim 5 or 6, wherein in the acquisition step, a measurement result of measuring the temperature of the printing plate by a temperature sensor provided inside the blanket wheel is acquired. .. The method for monitoring a state of a printing machine according to any one of claims 5 to 7, wherein the mandrel distance sensor makes a measurement when the operation of the printing machine is stopped.