JP3662396B2 - Printing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a printing apparatus for printing an image by recording an image on a printing plate and then supplying ink to the printing plate.
[0002]
[Prior art]
  In a conventional general printing apparatus, a printing plate is prepared by bringing a film on which a black and white binary image has been recorded and a printing plate into close contact in a plate making process, and then exposing the printing plate to the printing apparatus. The printing process was executed.
[0003]
  On the other hand, in recent years, a printing apparatus generally called a digital printing machine that can execute such a plate making process and a printing process with a single apparatus has been proposed. In this digital printing machine, a “computer to plate” system is employed in which a printing plate is directly scanned and exposed to form a image on a printing plate by a laser beam or the like modulated based on an image signal.
[0004]
  As one of the prior arts of such a digital printing machine, a printing device called quick master DI46-4 is sold by Heidelberg PMT Co., Ltd. FIG. 21 is a configuration diagram showing an outline of the printing apparatus.
[0005]
  This printing apparatus performs printing by an offset printing method, and a blanket cylinder 2, a plate cylinder 3, an ink supply device 4, and an image recording around an impression cylinder 1 on which four printing sheets can be mounted on the outer periphery. Four sets of each of the devices 5 are arranged. These four sets of blanket cylinder 2, plate cylinder 3, ink supply apparatus 4 and image recording apparatus 5 correspond to the colors of cyan (C), magenta (M), yellow (Y) and black (K), respectively. Is.
[0006]
  In this printing apparatus, a printing plate on which no image stored in a roll state is recorded in each plate cylinder 3 is unwound on the outer peripheral surface of the plate cylinder 3. The printing plate is irradiated with a modulated laser beam output from each image recording device 5 to form an image on the printing plate, thereby making the printing plate.
[0007]
  Next, the ink is supplied onto the plate-making printing plate by each ink supply device 4. In addition, four printing sheets supplied from the sheet feeding unit 6 are mounted on the outer periphery of the impression cylinder 1. Then, by rotating the impression cylinder 1, the blanket cylinder 2 and the plate cylinder 3 in contact with each other, the ink on each printing plate is sequentially transferred to the printing paper on the impression cylinder 1 via each blanket cylinder 2. Then, four colors are printed on each printing paper. The printing paper that has been printed is discharged to the paper discharge unit 8 by the paper discharge mechanism 7.
[0008]
  In normal offset printing, ink is supplied after dampening water is supplied onto the printing plate in advance. In this printing apparatus, a dampening water is provided with a silicone rubber layer on the surface of the printing plate. By using a waterless lithographic plate that does not require supply of dampening, the dampening water supply by the dampening water supply device is omitted.
[0009]
  Further, in the normal plate making process of the printing plate, the printing plate is made by developing the printing plate after irradiating the printing plate with the laser beam by the image recording device 5. In this printing device, By using a printing plate that is capable of making a plate only by laser beam irradiation, development processing by the development processing apparatus after laser irradiation is omitted.
[0010]
[Problems to be solved by the invention]
  Since the conventional printing apparatus shown in FIG. 21 is configured to make a printing plate on the plate cylinder 3, an image recording apparatus 5 is provided around the plate cylinder 3 in addition to the blanket cylinder 2 and the ink supply device 4. Must be provided. For this reason, it is difficult to secure a sufficient space for arranging these members.
[0011]
  In particular, in the printing apparatus shown in FIG. 21, the dampening water supply device and the development processing device are omitted by using a waterless lithographic plate of a type in which plate making is completed only by laser beam irradiation. However, when using a general printing plate, it is necessary to use these dampening water supply devices and development processing devices. For this reason, in addition to the blanket cylinder 2, the ink supply device 4, and the image recording device 5 described above, it is necessary to dispose a fountain solution supply device and a development processing device around the plate cylinder 3. It is substantially impossible to arrange these members around the plate cylinder 3.
[0012]
  Further, when a plate feeding device that supplies a printing plate to the plate cylinder 3 and a plate discharging device that discharges the printing plate from the plate cylinder are provided around the plate cylinder 3, a sufficient space is required.
[0013]
  Further, in the conventional printing apparatus shown in FIG. 21, in order to form images on printing plates mounted on a plurality of plate cylinders 3, image recording devices 5 are arranged at positions facing the plate cylinders 3, respectively. There is a need. For this reason, a plurality of image recording apparatuses 5 are required, which not only complicates the apparatus but also increases the price of the entire apparatus.
[0014]
  For this reason, the applicant of the present invention is a printing apparatus that performs printing by supplying an ink to a printing plate after recording an image on the printing plate and making a plate, in order to solve the above-described problems. A plate cylinder that holds the image on the outer periphery thereof, an image recording apparatus that records an image on the printing plate held on the plate cylinder, an image recording position that faces the image recording apparatus, and a printing plate that is held on the plate cylinder Has proposed a plate cylinder moving type printing apparatus provided with a plate cylinder moving mechanism for moving between printing positions for printing (Japanese Patent Application No. 9-95023).
[0015]
  According to this printing apparatus, the image recording apparatus used in the plate making process of the printing plate and the ink supply apparatus used in the printing process can be arranged at different positions without interfering with each other. , It is easy to secure a space for arranging them, and the degree of freedom in arrangement can be improved.
[0016]
  In such a plate cylinder moving type printing apparatus, an image is recorded on the printing plate held on the plate cylinder by an image recording device, or the printing plate on which the image is recorded is developed for processing. It is necessary to rotate the cylinder at a constant speed at the image recording position. At this time, in a normal printing apparatus, the plate cylinder is generally configured to rotate by receiving a drive from another cylinder by a gear disposed concentrically with the plate cylinder. is there.
[0017]
  However, at the time of image recording in which an image is recorded on a printing plate by an image recording device, it is necessary to rotate the plate cylinder with the printing plate held on its outer periphery at low speed and with high accuracy. At this time, the method of rotating the plate cylinder by driving a gear arranged concentrically with the plate cylinder is a method suitable for rotating the plate cylinder at a high speed, but is held by the plate cylinder. When printing plate cylinders are rotated at a relatively slow constant speed, such as when recording images on a printing plate, high precision is achieved due to the effects of backlash that occurs in gears and rotational unevenness that occurs due to gear processing accuracy errors. This causes a problem that the image recording becomes difficult.
[0018]
  The present invention has been made to solve the above-described problems, and provides a plate cylinder moving type printing apparatus capable of recording an image with high accuracy by preventing uneven rotation of the plate cylinder during image recording. The purpose is to do.
[0019]
[Means for Solving the Problems]
  The invention according to claim 1 is a printing apparatus for printing an image by recording an image on a printing plate and then supplying ink to the printing plate to perform printing, the printing cylinder holding the printing plate on the outer periphery thereof. An image recording apparatus for recording an image on a printing plate held on the plate cylinder, an image recording position on the plate cylinder facing the image recording apparatus, and printing on a printing plate held on the plate cylinder A plate cylinder moving mechanism that moves between a printing position to be performed, and a drive cylinder type rotation mechanism that is disposed in the vicinity of the image recording position and uses a frictional force that rotates the plate cylinder at the image recording position; ,The plate cylinder rotating mechanism of the drive transmission system using the frictional force includes a driving roller that rotates by driving a motor, a driven roller that is concentrically connected to the plate cylinder, and the driven roller that drives the driven roller. Low A transmission roller for transmitting drive to the roller, and a transmission roller for moving the transmission roller between a drive transmission position where the transmission roller is pressed against the driving roller and the driven roller, and a retracted position spaced apart from the driving roller and the driven roller And a moving mechanismIt is characterized by that.
[0020]
  According to a second aspect of the present invention, there is provided a printing apparatus for printing after recording an image on a printing plate and supplying ink to the printing plate to hold the printing plate on the outer periphery thereof. A second plate cylinder, a single image recording apparatus for recording an image on the printing plate held by the first and second plate cylinders, and the first plate cylinder, the image recording apparatus. A first plate cylinder moving mechanism for moving between an image recording position opposite to the first printing cylinder and a first printing position where printing is performed by a printing plate held on the first plate cylinder, and the second plate cylinder Near the image recording position, and a second plate cylinder moving mechanism for moving the image recording position between the image recording position and a second printing position where printing is performed by the printing plate held on the second plate cylinder. A drive transmission using a frictional force arranged to rotate the first plate cylinder or the second plate cylinder at the image recording position. And the plate cylinder rotation mechanism of the system,A drive cylinder rotating mechanism of the drive transmission system using the frictional force, a driving roller that rotates by driving a motor, a first driven roller that is concentrically connected to the first plate cylinder, A second driven roller connected concentrically with the second plate cylinder, a transmission roller for transmitting drive from the driving roller to the first driven roller or the second driven roller, and the transmission A transmission roller that moves the roller between a drive transmission position that is in pressure contact with the drive roller and the first or second driven roller, and a retracted position that is separated from the drive roller and the first or second driven roller. And a moving mechanismIt is characterized by that.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a printing apparatus according to the present invention.
[0022]
  In this printing apparatus, an image is recorded on a printing plate on which the images held on the first and second plate cylinders 11 and 12 are not recorded, and then the ink supplied to the printing plate is first, Printing is performed by transferring to the printing paper held by the impression cylinder 15 via the second blanket cylinders 13 and 14.
[0023]
  This printing apparatus includes a first plate cylinder 11 that can move between a first printing position indicated by a solid line in FIG. 1 and an image recording position indicated by a two-dot chain line, and a second printing indicated by a solid line in FIG. And a second plate cylinder 12 movable between the position and the image recording position.
[0024]
  Around the first plate cylinder 11 moved to the first printing position, an ink supply device 20a for supplying black (K) ink to the printing plate and magenta (M) ink to the printing plate, for example. An ink supply device 20b for supplying water and dampening water supply devices 21a and 21b for supplying dampening water to the printing plate are arranged. Further, around the second printing cylinder 12 moved to the second printing position, an ink supply device 20c for supplying, for example, cyan (C) ink to the printing plate, and, for example, yellow (Y) to the printing plate. An ink supply device 20d for supplying the ink and dampening water supply devices 21c and 21d for supplying dampening water to the printing plate are disposed. Further, around the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position, a plate feeding unit 23, a plate discharging unit 24, an image recording device 25, and a development processing device 26 are arranged. Has been.
[0025]
  In addition, the printing apparatus includes a first blanket cylinder 13 provided so as to be in contact with the first plate cylinder 11 and a second blanket cylinder 14 provided so as to be able to contact the second plate cylinder 12. The first and second blanket cylinders 13 and 14 are provided with an impression cylinder 15 that can contact the first and second blanket cylinders 13 and 14 at different positions, and a supply for passing the printing paper supplied from the paper supply unit 27 to the impression cylinder 15. A paper cylinder 16, a paper discharge cylinder 17 around which a chain 19 for discharging printed printing paper received from the impression cylinder 15 to a paper discharge unit 28 is wound, and a blanket cleaning device 29 are provided.
[0026]
  The first and second plate cylinders 11 and 12 are connected to first and second plate cylinder moving mechanisms 31 and 32, which will be described later, respectively. Is driven to reciprocate between the first or second printing position and the image recording position.
[0027]
  As will be described later, gears 51 arranged concentrically with the first and second plate cylinders 11 are attached to the sides of the first and second plate cylinders 11, respectively. Gears 52 arranged concentrically with the first and second blanket cylinders 13 and 14 are attached to the sides of the first and second blanket cylinders 13 and 14, respectively. When the first plate cylinder 11 is moved to the first printing position, the gear 51 attached to the first plate cylinder 11 and the gear 52 attached to the first blanket cylinder 13 mesh with each other. It is configured to Similarly, when the second plate cylinder 12 is moved to the second printing position, the gear 51 attached to the second plate cylinder 12 and the gear 52 attached to the second blanket cylinder 14 are mutually connected. It is comprised so that it may mesh.
[0028]
  For this reason, the first plate cylinder 11 rotates in synchronization with the first blanket cylinder 13 at the first printing position. Similarly, the second plate cylinder 12 rotates in synchronization with the second blanket cylinder 14 in the second printing position.
[0029]
  Further, a traction type plate cylinder rotating mechanism 30 to be described later is disposed in the vicinity of the image recording position, and both the first and second plate cylinders 11 and 12 are moved to the image recording position. The plate cylinder rotating mechanism 30 is driven to rotate.
[0030]
  FIG. 2 is a front view of the first and second plate cylinder moving mechanisms 31 and 32 described above, and FIG. 3 is a side sectional view showing the vicinity of the bearing portion 33 in the first plate cylinder moving mechanism 31. Since the first and second plate cylinder moving mechanisms 31 and 32 have the same configuration that is symmetrical to each other, members common to the first and second plate cylinder moving mechanisms 31 and 32 are the same. The code | symbol is attached | subjected.
[0031]
  The first and second plate cylinder moving mechanisms 31 and 32 are configured to move the side plate so as to move the bearing portion 33 including a pair of bearings 34 that support the support shaft 36 of the first and second plate cylinders 11 and 12. 37 has a slot 38 bored in 37 (note that only the slot 38 is shown in FIG. 2 and this is not shown in the side plate 37). The bearing portion 33 is connected to a slide holder 41 that can move along the guide member 39. Further, the slide holder 41 is provided with a nut 42. The nut 42 is screwed with a ball screw 44 connected to the drive shaft of the motor 35.
[0032]
  For this reason, the first plate cylinder 11 is movable together with the slide holder 41 by driving the motor 35. The first plate cylinder 11 is along the guide member 39 and the ball screw 44 in the first printing position indicated by the solid line in FIG. 1 and by the two-dot chain line in FIG. 2 and the two-dot chain line in FIG. Further, it moves between image recording positions indicated by solid lines in FIG. Similarly, the second plate cylinder 12 can be moved together with the slide holder 41 by driving the motor 35. The second plate cylinder 12 is arranged along the guide member 39 and the ball screw 44 at the second printing position indicated by a solid line in FIGS. 1 and 2, a two-dot chain line in FIG. 1, and a solid line in FIG. It moves between the image recording positions indicated by.
[0033]
  A fixing member 43 for fixing the bearing portion 33 is disposed in the vicinity of the first and second printing positions on the side plate 37. The first plate cylinder 11 is positioned and fixed by the fixing member 43 at the first printing position, and the second plate cylinder 12 is positioned and fixed by the fixing member 43 at the second printing position.
[0034]
  The first and second plate cylinders 11 and 12 are respectively connected to the first and second plate cylinders 11 and 12 when the first and second plate cylinder moving mechanisms 31 and 32 are moved. An anti-rotation mechanism to be described later for preventing the rotation of the two plate cylinders 11 and 12 is provided.
[0035]
  The reason why the rotation of the first and second plate cylinders 11 and 12 is prevented using this rotation prevention mechanism is as follows. That is, when a deviation occurs in the rotational positional relationship between the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 and other members, the positional deviation of printing and the interval between parts This positional relationship needs to be constant at all times. At this time, when an image is recorded on the printing plates held on the first and second plate cylinders 11 and 12 at the image recording position by an image recording device 25 described later, the first and second plates The rotational angle positions of the cylinders 11 and 12 are monitored by a photocoupler 87, a rotary encoder, etc., which will be described later. However, during the movement from the image recording position to the first and second printing positions, the first and second plate cylinders 11 and 12 are rotated, and the first and second plate cylinders 11 and 12 and the first and second printing cylinders are rotated. In some cases, the rotational positional relationship with the second blanket cylinders 13, 14, etc. may deviate. For this reason, the rotation preventing mechanism is used to prevent the first and second plate cylinders 11 and 12 from rotating when the first and second plate cylinders 11 and 12 are moved.
[0036]
  This anti-rotation mechanism is connected to the support shaft 36 of the first and second plate cylinders 11 and 12 and has a disk-like rotating plate 46 having a notch part in the outer periphery thereof, and a notch portion of the rotating plate 46. A rotation preventing member 47 for restricting the rotation of the rotating plate 46 by engaging with the rotation preventing member 47 in the first and second printing positions for releasing the engagement of the rotation preventing member 47 with the notch portion of the rotating plate 46, Release members 48 respectively disposed near the second printing position, and release members disposed near the image recording position for releasing the engagement of the rotation preventing member 47 with the notch portion of the rotating plate 46 at the image recording position. 49.
[0037]
  FIG. 4 is a schematic diagram showing the relationship between the rotation preventing member 47 disposed in the first plate cylinder 11 and the release member 48 disposed in the first printing position. The anti-rotation member 47 is engaged with the lever 54 that can swing about the shaft 53 disposed in the bearing portion 33, the engagement pin 55 erected on the surface side of the lever 54, and the lever 54. The guide pin 56 erected on the back side of the coupling pin 55, the pressing pin 57 disposed on the opposite side of the guide pin 56 with respect to the shaft 53, and the lever 54 are swung to rotate the engagement pin 55. And a spring 58 for biasing in the direction of the plate 46. On the other hand, the release member 48 includes a cam member having an inclined surface 59 for guiding the guide pin 56.
[0038]
  The second plate cylinder 12 is also provided with a rotation prevention member 47 similar to the above, and the second release position is also provided with a release member 48 similar to the above.
[0039]
  On the other hand, FIG. 7 is a schematic diagram showing the relationship between the rotation preventing member 47 and the release member 49 disposed at the image recording position in a state where the first plate cylinder 11 has moved to the image recording position. The release member 49 includes a pressing plate 62 reciprocally moved by an air cylinder 61 for pressing the pressing pin 57 of the rotation preventing member 47 in the first plate cylinder 11 moved to the image recording position downward.
[0040]
  Note that when the second plate cylinder 12 is moved to the image recording position, the pressing pin 57 of the rotation preventing member 47 disposed on the second plate cylinder 12 is pressed by the pressing plate 62 of the release member 49. .
[0041]
  FIG. 8 is a front view of the vicinity of the plate cylinder rotating mechanism 30 described above, and FIG. 9 is a side sectional view showing an essential part thereof. The plate cylinder rotating mechanism 30 is for rotating the first and second plate cylinders 11 and 12 at the image recording position, and prevents the rotation described above with respect to the first and second plate cylinders 11 and 12. It is arranged on the opposite side to the mechanism. In FIG. 9, the transmission rotor 78 and its moving mechanism are not shown.
[0042]
  The plate cylinder rotating mechanism 30 is connected to the driving roller 76 that is rotated by the drive of the motor 75 and the support shaft 36 of the first plate cylinder 11 or the second plate cylinder 12, whereby the first plate cylinder 11 or First and second driven rollers 77 arranged concentrically with the second plate cylinder 12, and arranged concentrically with the first plate cylinder 11 or the second plate cylinder 12 from the driving roller 76. And a transmission roller 78 for transmitting drive to one of the driven rollers 77 (hereinafter simply referred to as “driven roller 77”).
[0043]
  The lower end of the drive roller 76 is immersed in oil stored in the oil pan 79. Further, as described above, the driven roller 77 is concentric with the first plate cylinder 11 or the second plate cylinder 12 via the support shaft 36 of the first plate cylinder 11 or the second plate cylinder 12. It is arranged and rotates in synchronization with the first plate cylinder 11 or the second plate cylinder 12. Further, the transmission roller 78 is rotatably supported at the tip end of a cylinder rod of an air cylinder 80 whose base end is pivotally connected to the support member 91 via a shaft 92. Thus, it is possible to move between a drive transmission position in pressure contact with both the drive roller 76 and the driven roller 77 and a retracted position separated from the surfaces of the drive roller 76 and the driven roller 77.
[0044]
  Therefore, the drive roller 76 is rotated at a constant speed by driving the motor 75 while the transmission roller 78 is moved to the drive transmission position, whereby the rotation of the drive roller 76 is driven via the transmission roller 78. The first plate cylinder 11 rotates at a constant speed. At this time, the driving force by the motor 75 is generated by the first plate cylinder 11 or the second plate cylinder 12 by a traction type drive transmission mechanism using frictional forces between the driving roller 76, the driven roller 77, and the transmission roller 78. Therefore, the first plate cylinder 11 or the second plate cylinder 12 can be accurately rotated without causing rotation unevenness.
[0045]
  At this time, in particular, in the above-described embodiment, the transmission roller 78 can move between the drive transmission position that is in pressure contact with both the drive roller 76 and the driven roller 77 and the retracted position. After the second plate cylinders 11 and 12 have moved to the image recording position, the transmission roller 78 is brought into pressure contact with both the driving roller 76 and the driven roller 77 to thereby provide a gap between the transmission roller 78, the driving roller 76 and the driven roller 77. The first and second plate cylinders 11 and 12 can be accurately rotated without causing slippage.
[0046]
  Therefore, as in the printing apparatus according to this embodiment, the driven roller 77 is moved in accordance with the movement between the image recording position of the first and second plate cylinders 11 and 12 and the first and second printing positions. Even when the first and second plate cylinders 11 and 12 are moved to the image recording position, the transmission roller 78 is moved to both the driving roller 76 and the driven roller 77. By moving to the driving transmission position where the pressure contact is made, the transmission roller 78 can be reliably brought into pressure contact with each driven roller 77 moved to the image recording position as well as the driving roller 76. The transmission roller 78, the driving roller 76, and the driven roller It is possible to accurately rotate the first and second plate cylinders 11 and 12 without causing slippage between them.
[0047]
  The driven roller 77 is provided with four positioning members 81a, 81b, 81c, 81d composed of V blocks for positioning and fixing the first and second plate cylinders 11, 12 at predetermined angular positions. Has been. The positioning members 81 a, 81 b, 81 c, 81 d engage the driven roller 77 by engaging with a locking pin 85 provided at the tip of a lever 84 that swings about a shaft 83 by driving the air cylinder 82. The first and second plate cylinders 11 and 12 are used for positioning and fixing at predetermined rotational angular positions.
[0048]
  The driven roller 77 is provided with a detection plate 86 used for detecting the rotational angle position of the driven roller 77, and the side plate 37 has a photo for detecting the detection plate 86. A coupler 87 is provided. The rotation angle position of the driven roller 77, that is, the rotation angle position of the first and second plate cylinders 11 and 12 is determined by the detection signal of the detection plate 86 by the photocoupler 87 and the first and second plate cylinders 11. The first and second plate cylinders 11 and 12 are connected to the 12 spindles 36 and are monitored by a rotary encoder (not shown) that generates a pulse signal as the first and second plate cylinders 11 and 12 rotate.
[0049]
  Further, a light shielding plate 88 is attached to the support shaft 36 of the first and second plate cylinders 11 and 12.
[0050]
  Next, the rotation prevention operation for the first and second plate cylinders 11 and 12 by the rotation prevention mechanism described above, and the first and second plate cylinders 11 and 12 by the traction type plate cylinder rotation mechanism 30 described above. The rotational driving operation will be described. In the following description, the rotation prevention operation and the rotation drive operation for the first plate cylinder 11 will be described, but the rotation prevention operation and the rotation drive operation for the second plate cylinder 12 are also executed by the same process.
[0051]
  As shown in FIG. 4, when the first plate cylinder 11 is located at the first printing position, the gear 51 and the first blanket cylinder 13 arranged concentrically with the first plate cylinder 11. And the gear 52 arranged concentrically with each other.
[0052]
  In this state, as shown in FIG. 5, if the first plate cylinder 11 starts moving from the first printing position to the image recording position by the first plate cylinder moving mechanism 31, The engagement between the gear 51 arranged concentrically and the gear 52 arranged concentrically with the first blanket cylinder 13 is gradually released. Accordingly, the guide pin 56 of the rotation preventing member 47 slides along the inclined surface 59 of the release member 48, and the lever 54 swings about the shaft 53, whereby the engagement pin 55 rotates. The movement starts in the notch in the plate 46.
[0053]
  At this time, the engagement between the gear 51 arranged concentrically with the first plate cylinder 11 and the gear 52 arranged concentrically with the first blanket cylinder 13 is completely released. Further, since the rotation prevention member 47 has not yet prevented the rotation of the first plate cylinder 11, the first plate cylinder 11 is rotating in the counterclockwise direction in the state shown in FIG. 5. Move toward the image recording position. For this reason, it is possible to prevent the gears 51 and 52 from colliding and being damaged.
[0054]
  Then, as shown in FIG. 6, the first plate cylinder 11 further moves in the image recording position direction, and the gear 51 and the first blanket cylinder 13 arranged concentrically with the first plate cylinder 11. When the engagement with the gear 52 arranged concentrically with the gear 52 is released, the guide pin 56 of the rotation prevention member 47 is completely detached from the inclined surface 59 of the release member 48 and the engagement pin 55 rotates. The plate 46 is completely stored in the notch. For this reason, rotation of the first plate cylinder 11 is prevented.
[0055]
  In this state, the first plate cylinder 11 is moved to the image recording position by driving the first plate cylinder moving mechanism 31 as shown in FIG. Then, as shown in FIG. 8, the transmission roller 78 of the plate cylinder rotation mechanism 30 is moved to the drive transmission position where it is pressed against both the drive roller 76 and the driven roller 77 by driving the air cylinder 80. Thereafter, the pressing plate 62 in the above-described release mechanism 49 is moved from the position indicated by the solid line in FIG. As a result, the pressing pin 57 of the rotation preventing member 47 moves downward and the lever 54 swings about the shaft 53, so that the engaging pin 55 is detached from the notch portion of the rotating plate 46. Accordingly, the first plate cylinder 11 is in a rotatable state.
[0056]
  In this state, the first plate cylinder 11 is rotated at a low speed by the traction type plate cylinder rotating mechanism 30, and the printing plate is mounted on the first plate cylinder 11. Record an image. Then, after the recording of the image on the printing plate is completed, the printing plate is developed by the development processing device 26. When the recording of the image on the printing plate and the development processing are completed, the first plate cylinder 11 is returned to the origin position using the detection values by the detection plate 86, the photocoupler 87, and the like. Then, the transmission roller 78 of the plate cylinder rotating mechanism 30 is moved to the retracted position by driving the air cylinder 80, and the air cylinder 82 shown in FIG. 8 is driven to engage the positioning member 81a and the engaging pin 85. Thus, the first plate cylinder 11 is positioned and fixed at a predetermined rotational angle position via the driven roller 77.
[0057]
  Thereafter, the pressing plate 62 in the release mechanism 49 is moved from the position indicated by the two-dot chain line in FIG. 7 to the position indicated by the solid line by driving the air cylinder 61. As a result, the pressing pin 57 of the rotation preventing member 47 moves upward and the lever 54 swings about the shaft 53, so that the engagement pin 55 of the rotation preventing member 47 and the notch portion of the rotating plate 46 are moved. Engage. Accordingly, the rotation of the first plate cylinder 11 is prevented. Thereafter, the air cylinder 82 is driven to disengage the positioning member 81a from the engagement pin 85.
[0058]
  Subsequently, the first plate cylinder 11 is moved from the image recording position to the first printing position by driving the first plate cylinder moving mechanism 31. Along with the movement of the first plate cylinder 11, the rotation preventing member 47 is operated by an operation opposite to the movement of the first plate cylinder 11 from the first printing position to the image recording position shown in FIGS. The engagement between the engaging pin 55 and the notch in the rotating plate 46 is released.
[0059]
  That is, as the first plate cylinder 11 moves from the position shown in FIG. 6 to the position shown in FIG. 5, the guide pin 56 of the rotation preventing member 47 slides along the inclined surface 59 of the release member 48, and the lever As the pin 54 swings about the shaft 53, the engaging pin 55 moves outward from the notch in the rotating plate 46. At the same time, the meshing operation of the gear 51 arranged concentrically with the first plate cylinder 11 and the gear 52 arranged concentrically with the first blanket cylinder 13 is started.
[0060]
  At this time, along with the start of the meshing operation of the gear 51 disposed concentrically with the first plate cylinder 11 and the gear 52 disposed concentrically with the first blanket cylinder 13, the above-described operation is performed. The prevention of rotation of the first plate cylinder 11 by the rotation preventing member 47 is released, and the first plate cylinder 11 moves toward the first printing position while rotating clockwise in the state shown in FIG. . For this reason, it is possible to prevent the gears 51 and 52 from colliding and being damaged.
[0061]
  As shown in FIG. 4, when the first plate cylinder 11 returns to the first printing position, the gear 51 and the first blanket cylinder 13 disposed concentrically with the first plate cylinder 11. And the gear 52 arranged concentrically with each other completely mesh with each other.
[0062]
  Referring again to FIG. 1, a plate supply unit 23 and a plate discharge unit 24 are arranged around the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position.
[0063]
  In the plate supply unit 23, a supply cassette 63 that stores a long roll-shaped printing plate on which no image is recorded in a light-tight state, and a front end portion of the printing plate drawn out from the supply cassette 63 is a first plate. A guide member 64 and a guide roller 65 for guiding the surface of the cylinder 11 or the second plate cylinder 12 and a cutter 66 for cutting a long printing plate into a sheet-like printing plate are provided. ing. Further, the first and second plate cylinders 11 and 12 are provided with a pair of gripping claws (not shown) for holding the leading end portion and the trailing end portion of the printing plate supplied from the plate feeding portion 23. .
[0064]
  The plate discharging unit 24 discharges the printing plate peeled off by the action of the nail mechanism 73 for peeling off the printing plate held on the first plate cylinder 11 or the second plate cylinder 12 after the printing is completed. And a conveyor mechanism 69 for conveying to the cassette 68.
[0065]
  The leading end portion of the printing plate drawn out from the supply cassette 63 in the plate supply unit 23 is guided by the guide roller 65 and the guide member 64, and is held in one holding nail of the first plate cylinder 11 or the second plate cylinder 12. It is done. Then, the first plate cylinder 11 or the second plate cylinder 12 is rotated by driving the plate cylinder rotation mechanism 30, and the printing plate is wound around the outer periphery of the first plate cylinder 11 or the second plate cylinder 12. Then, the rear end portion of the printing plate cut by the cutter 66 is held by the other holding nail. In this state, as described above, the first plate cylinder 11 or the second plate cylinder 11 is rotated by the image recording device 25 while the first plate cylinder 11 or the second plate cylinder 12 is rotated at a low speed by driving the plate cylinder rotating mechanism 30. The surface of the printing plate held on the outer periphery of the second plate cylinder 12 is irradiated with a modulated laser beam to record an image.
[0066]
  As shown in FIG. 10A, the printing plate P mounted on the outer periphery of the first plate cylinder 11 has an image area 67a for printing with black ink as shown in FIG. An image area 67b for printing with magenta ink is recorded. Further, the printing plate P mounted on the outer periphery of the second plate cylinder 12 has an image area 67c for printing with cyan ink by the image recording device 25 as shown in FIG. An image area 67d for printing with yellow ink is recorded. The image area 67a and the image area 67b are recorded at positions where the image area 67a and the image area 67b are evenly distributed (that is, 180 degrees apart from each other) when mounted on the outer periphery of the first plate cylinder 11. Similarly, the image area 67c and the image area 67d are recorded at positions where the image area 67c and the image area 67d are evenly distributed (ie, 180 degrees apart from each other) when mounted on the outer periphery of the second plate cylinder 12. The
[0067]
  In the embodiment described above, in order to simplify the configuration of the first plate cylinder 11 or the second plate cylinder 12, it is held on the outer periphery of the first plate cylinder 11 or the second plate cylinder 12. Two image areas 67a, 67b or 67c, 67d are provided on one printing plate P. However, the first plate cylinder 11 or the second plate cylinder 1 or the second plate cylinder 12 is provided with two sets of holding claws for holding the front end portion and the rear end portion, respectively. A configuration may be adopted in which each of the cylinders 12 holds two printing plates P. Also in this case, the first printing is performed with the two printing plates P being equally distributed so that the image areas of the printing plates P are evenly distributed (that is, 180 ° apart from each other). It is necessary to hold on the plate cylinder 11 or the second plate cylinder 12.
[0068]
  Referring to FIG. 1 again, as described above, around the first plate cylinder 11 moved to the first printing position, the ink supply device 20a and the ink supply device 20b are also used for the second printing. Around the second plate cylinder 12 moved to the position, an ink supply device 20c and an ink supply device 20d are arranged. Each of these ink supply devices 20a, 20b, 20c and 20d (referred to collectively as “ink supply device 20”) includes a plurality of ink rollers 71 and ink fountains 72.
[0069]
  The ink roller 71 of the ink supply devices 20a and 20b swings by the action of a cam (not shown). And by this rocking | fluctuation operation | movement, it is the ink supply apparatus 20a or 20b in arbitrary image areas of the two image areas 67a and 67b formed in the printing plate P hold | maintained at the outer peripheral part of the 1st plate cylinder 11. FIG. The ink roller 71 is in contact with the ink roller 71 so that ink can be supplied only to a necessary image area. Similarly, the ink roller 71 of the ink supply devices 20c and 20d also swings by the action of a cam (not shown). And by this rocking | fluctuation operation | movement, it is the ink supply apparatus 20c or 20d to arbitrary image area | regions of the two image area | regions 67c and 67d formed in the printing plate P hold | maintained at the outer peripheral part of the 2nd plate cylinder 12. FIG. The ink roller 71 is in contact with the ink roller 71 so that ink can be supplied only to a necessary image area.
[0070]
  Referring to FIG. 1 again, dampening water supply devices 21a, 21b, 21c and 21d (referred to collectively as “dampening water supply device 21”) are applied to the printing plate P by the ink supply device 20. Before supplying ink, dampening water is supplied to the printing plate P. Among these fountain solution devices 21, the fountain solution supply device 21a is in the image area 67a of the printing plate P, the fountain solution supply device 21b is in the image region 67b of the printing plate P, and the fountain solution supply device 21c is in the printing area. The dampening water supply device 21d supplies dampening water to the image area 67c of the printing plate P and the image area 67d of the printing plate P, respectively.
[0071]
  Below the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, the development processing device 26 described above is disposed. The development processing device 26 includes a development unit, a fixing unit, and a diaphragm unit, and is configured to be movable up and down between a standby position indicated by a two-dot chain line and a development processing position indicated by a solid line in FIG.
[0072]
  When the printing plate P on which an image is recorded by the image recording device 25 is developed by the development processing device 26, the printing plate rotating mechanism 30 is driven to rotate together with the first plate cylinder 11 or the second plate cylinder. The developing unit, the fixing unit, and the diaphragm unit are sequentially brought into contact with the printing plate P.
[0073]
  The first and second blanket cylinders 13 and 14 provided so as to be in contact with the first and second plate cylinders 11 and 12 have the same diameter as the first and second plate cylinders 11 and 12. A blanket for ink transfer is mounted on the outer periphery. The first and second blanket cylinders 13 and 14 can be brought into contact with and separated from the first and second plate cylinders 11 and 12 and the impression cylinder 15 by a cylinder insertion mechanism described later.
[0074]
  FIG. 11 is a schematic view showing a body insertion mechanism of the first blanket cylinder 13. Note that the cylinder insertion mechanism of the second blanket cylinder 14 has the same configuration as the cylinder insertion mechanism of the first plate cylinder 13 shown in FIG.
[0075]
  An eccentric shaft 102 having a center different from that of the shaft 101 is connected to the side of the shaft 101 that rotatably supports the first blanket cylinder 13. Further, an eccentric bearing 103 having a different center from that of the shafts 101 and 102 is disposed around the eccentric shaft 102. Therefore, as shown in FIG. 11, the center 104 of the shaft 101 (that is, the center of the first blanket cylinder 13) 104, the center 105 of the eccentric shaft 102, and the center 106 of the eccentric bearing 103 are at different positions. Be placed.
[0076]
  The fixed plate 107 fixed to the eccentric shaft 102 and the fixed plate 108 fixed to the eccentric bearing 103 are connected by two connecting plates 111 and 112 constituting a link mechanism. The tip of the cylinder rod 114 of the air cylinder 113 is connected to the connecting portion of the two connecting plates 111 and 112. The air cylinder 113 main body is connected to one end of a rotating plate 116 that rotates about a shaft 115. Further, the other end of the rotating plate 116 is connected to a fixed plate 118 fixed to the eccentric bearing 103 via a rod 117.
[0077]
  The rotating plate 116 and the shaft 120 of the eccentric member 119 are connected by two connecting plates 121 and 122 constituting a link mechanism. The tip of the cylinder rod 124 of the air cylinder 123 fixed to the apparatus main body is connected to the connecting portion of the two connecting plates 121 and 122. Further, the worm wheel 125 connected to the eccentric member 119 is screwed with a worm gear 127 that rotates by driving of the motor 126.
[0078]
  In such a configuration, when the cylinder rods 114 and 124 of the air cylinders 113 and 123 are extended, as shown in FIG. 11, the surface of the first blanket cylinder 13, the first plate cylinder 11 and the impression cylinder. It is separated from the 15 surface by a small distance.
[0079]
  In this state, when the cylinder rod 114 is contracted by driving the air cylinder 113, the first blanket cylinder 13 is moved to the first plate cylinder 11 by the action of the link mechanism by the two connecting plates 111, 112 and the like. The first plate cylinder 11 is moved in the direction.
[0080]
  In this state, when the cylinder rod 124 is contracted by driving the air cylinder 123, the first blanket cylinder 13 is moved to the impression cylinder 15 by the action of the link mechanism constituted by the two connecting plates 121, 122 and the like. It moves in the direction and the cylinder is put into the impression cylinder 15. At this time, since the rotating plate 116 also rotates clockwise about the shaft 115, the first blanket cylinder 13 moves not only in the impression cylinder 15 direction but also in the first plate cylinder 11 direction. Accordingly, the cylinder blanking state of the first plate cylinder 11 in the first blanket cylinder 13 is maintained.
[0081]
  In addition, when the eccentric member 119 is rotated, the shaft 120 of the eccentric member 119 slightly moves. Therefore, the worm wheel 125 connected to the eccentric member 119 is rotated by driving the motor 126 and the shaft 120 is finely moved, so that the contact between the impression cylinder 15 and the first plate cylinder 11 and the first blanket cylinder 13 is achieved. The pressure can be adjusted. Therefore, it is possible to adjust the printing pressure during printing using the first blanket cylinder 13.
[0082]
  Referring to FIG. 1 again, the blanket cleaning device 29 disposed between the first and second blanket cylinders 13 and 14 has a path from the unwinding roll to the winding roll via a plurality of pressure rollers. The cleaning liquid is supplied to the pasted long cleaning cloth, and the cleaning cloth is brought into contact with the first and second blanket cylinders 13 and 14 and then slid, whereby the first and second The surface of the blanket cylinders 13 and 14 is cleaned. In addition, the surface of the impression cylinder 15 may be cleaned by bringing the cleaning cloth into contact with the surface of the impression cylinder 15 as well.
[0083]
  The impression cylinder 15 provided so as to be in contact with the first and second blanket cylinders 13 and 14 has diameters of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. It has a diameter of 1/2. The impression cylinder 15 has a gripper (not shown) for holding and transporting the leading edge of the printing paper.
[0084]
  In addition, the sheet feeding cylinder 16 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper feed cylinder 16 conveys the leading end of the printing paper supplied one by one from the paper feed unit 27 by the reciprocating suction plate 74 by a gripper (not shown). The leading edge of the printing paper held by the gripper is held by the gripper of the impression cylinder 15 when the printing paper is transferred from the paper feeding cylinder 16 to the impression cylinder 15.
[0085]
  Further, the paper discharge cylinder 17 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper discharge cylinder 17 has a structure in which a pair of chains 19 are wound around both ends thereof, and grippers are respectively disposed on connecting members (not shown) that connect the pair of chains 19. The leading end of the printing paper held by the gripper of the pressure drum 15 is held by any gripper of the paper discharge drum 17 when the printing paper is transferred from the pressure drum 15 to the paper discharge drum 17. The printing paper is transported onto the paper discharge unit 28 as the chain 19 moves and is discharged.
[0086]
  The paper feed cylinder 16 is connected to a drive motor via a belt (not shown). The paper feed cylinder 16, the pressure drum 15, the paper discharge cylinder 17, and the first and second blanket cylinders 13 and 14 are connected to each other by gears attached to the ends thereof. Further, the first blanket cylinder 13 and the first plate cylinder 11 moved to the first printing position, and the second blanket cylinder 14 and the second plate cylinder 12 moved to the second printing position are: As described above, the gears 51 and 52 attached to the end portions are connected to each other. Accordingly, the drive cylinder (not shown) drives the feed cylinder 16, the impression cylinder 15, the discharge cylinder 17, the first and second blanket cylinders 13 and 14, and the first and second plate cylinders 11 and 12. , Rotate in sync with each other.
[0087]
  FIG. 12 is a block diagram showing the main electrical configuration of the printing apparatus. The printing apparatus includes a control unit 140 including a ROM 141 that stores an operation program necessary for controlling the apparatus, a RAM 142 that temporarily stores data and the like during control, and a CPU 143 that executes logical operations. The control unit 140 is connected to the ink supply device 20, the image recording device 25, the development processing device 26, the blanket cleaning device 29, the first and second plate cylinder moving mechanisms 31, 32, first, The second blanket cylinders 13 and 14 are connected to a drive circuit 145 that generates a drive signal for a drive unit and the like in the case insertion mechanism and the like. The printing apparatus is controlled by the control unit 140 and executes a plate making operation and a printing operation, which will be described later.
[0088]
  Next, plate making and printing operations by this printing apparatus will be described. FIG. 13 is a flowchart showing an outline of plate making and printing operations by this printing apparatus. The printing and plate making operations are for the case where multicolor printing is performed on printing paper with four colors of inks of yellow, magenta, cyan, and black.
[0089]
  First, a plate making process is performed in which an image is recorded on the printing plate P on the first and second plate cylinders 11 and 12 and development processing is performed (step S1). This plate making process is executed according to the process shown in the flowchart of FIG. 14 as a subroutine.
[0090]
  That is, first, the first plate cylinder 11 is moved to the plate making position indicated by a two-dot chain line in FIG. 1 (step S11). The movement of the first plate cylinder 11 is executed by moving the slide holder 41 along the guide member 39 by driving the motor 35 of the first plate cylinder moving mechanism 31 shown in FIG.
[0091]
  Next, the printing plate P is supplied to the outer periphery of the first plate cylinder 11 (step S12). The supply of the printing plate P is executed by holding the leading portion of the printing plate P drawn from the supply cassette 63 and the rear end portion of the printing plate P cut by the cutter 66 with a pair of gripping claws (not shown).
[0092]
  Subsequently, an image is recorded on the printing plate P held on the outer periphery of the first plate cylinder 11 (step S13). This image is recorded by rotating the first plate cylinder 11 at a low speed by the plate cylinder rotating mechanism 30 and modulating the laser from the image recording device 25 to the printing plate P held on the outer periphery of the first plate cylinder 11. This is performed by irradiating the beam.
[0093]
  Next, the printing plate P on which the image is recorded is developed (step S14). In this development processing, after the development processing device 26 is raised from the standby position indicated by the two-dot chain line in FIG. 1 to the development processing position indicated by the solid line, the plate cylinder rotation mechanism 30 is driven to rotate together with the first plate cylinder 11. The printing plate P is executed by bringing the developing unit, the fixing unit, and the aperture unit into contact with each other in order.
[0094]
  When the developing process is completed, the first plate cylinder 11 is moved to the first printing position indicated by the solid line in FIG. 1 (step S15).
[0095]
  Subsequently, a plate making process for the printing plate P held on the outer periphery of the second plate cylinder 12 is performed by the same operation as in steps S11 to 15 (steps S16 to S20). And if the plate making to the printing plate P hold | maintained on the outer periphery of the 1st, 2nd plate cylinders 11 and 12 is complete | finished, a plate making process will be complete | finished.
[0096]
  Referring to FIG. 13 again, when the plate making process is completed, a printing process for printing on printing paper using printing plates P on the first and second plate cylinders 11 and 12 is executed (step S2). The operation of the printing apparatus in this printing process will be described in detail later.
[0097]
  When the printing process is completed, the printing plate P used for printing is discharged (step S3). In order to discharge the printing plate P, the first plate cylinder 11 is first moved to a plate making position indicated by a two-dot chain line in FIG. Then, the first cylinder 11 is rotated counterclockwise by the plate cylinder rotating mechanism 30 and the end portion of the printing plate P held on the first plate cylinder 11 is peeled off by the claw mechanism 73. The printing plate P is guided by the conveyor mechanism 69 and discharged into the discharge cassette 68. Then, after the first plate cylinder 11 is returned to the first printing position, the second plate cylinder 12 is moved from the second printing position to the plate-making position, and the same operation as described above is executed. The printing plate P held on the second plate cylinder 12 is discharged into the discharge cassette 68.
[0098]
  When the discharge process of the printing plate P is completed, the first and second blanket cylinders 13 and 14 are washed (step S4). When the first and second blanket cylinders 13 and 14 are cleaned, the first and second blanket cylinders 13 and 14 and the first and second plate cylinders 11 and 12 and the pressure cylinders are pressed by the cylinder insertion mechanism shown in FIG. After being separated from the cylinder 15, the first and second blanket cylinders 13 and 14 are rotated. In this state, the cleaning cloth supplied with the cleaning liquid in the blanket cleaning device 29 is brought into contact with the surfaces of the first and second blankets 13 and 14 and then slid to thereby move the first and second blanket cylinders. 13 and 14 are washed.
[0099]
  When the cleaning of the first and second blanket cylinders 13 and 14 is completed, it is confirmed whether or not another print product is to be printed (step S5). When other printing work is performed, the operations in steps 1 to 4 are repeated.
[0100]
  When the printing operation is completed, the ink is washed (step S6). This ink cleaning is performed by removing and cleaning ink adhering to the ink roller 71 and the ink fountain 72 in each ink supply device 20 by an ink cleaning device (not shown) disposed in each ink supply device 20. .
[0101]
  When the ink cleaning process is completed, all processes are completed.
[0102]
  Next, the operation of the printing apparatus in the printing process described above will be described. 15 to 20 are explanatory views showing the printing operation of this printing apparatus. In these drawings, for convenience of explanation, the length of the printing paper S and the peripheral lengths of the impression cylinder 15, the paper feed cylinder 16, and the paper discharge cylinder 17 are expressed as being the same. The length of the printing paper S is shorter than the circumferential length of the impression cylinder 15, the paper feed cylinder 16 and the paper discharge cylinder 17.
[0103]
  Note that the printing operation described below is for multi-color printing on four-color inks of yellow, magenta, cyan, and black, as described above. In FIGS. 15 to 20, for convenience of explanation, the area of the first plate cylinder 11 and the first blanket cylinder 13 on the side used for printing the black ink is denoted by K, and the first The area of the plate cylinder 11 and the first blanket cylinder 13 on the side used for printing magenta ink is marked with M, and the cyan of the second plate cylinder 12 and the second blanket cylinder 14 is cyan. An area C used for ink printing is denoted by C, and an area of the second plate cylinder 12 and the second blanket cylinder 14 used for printing yellow ink is denoted by Y. ing.
[0104]
  In the plate making process prior to the printing process, as described above, the printing plate P mounted on the outer peripheral portion of the first plate cylinder 11 is printed with black ink as shown in FIG. An image area 67a for printing and an image area 67b for printing with magenta ink are recorded, and the printing plate P mounted on the outer peripheral portion of the second plate cylinder 12 is shown in FIG. ), An image area 67c for printing with cyan ink and an image area 67d for printing with yellow ink are recorded.
[0105]
  Further, as described above, black ink is used for the ink supply device 20a, magenta ink is used for the ink supply device 20b, cyan ink is used for the ink supply device 20c, and yellow ink is used for the ink supply device 20d. The black ink is supplied from the ink supply device 20a to the image area 67a of the printing plate P shown in FIG. 10, the magenta ink is supplied from the ink supply device 20b to the image area 67b, and the ink is supplied to the image area 67c. Cyan ink is supplied from the supply device 20c, and yellow ink is supplied from the ink supply device 20d to the image area 67d.
[0106]
  First, each fountain solution supply device 21 and each ink supply device 20 are brought into contact only with the corresponding image areas of the printing plates P held on the first and second plate cylinders 11 and 12. Accordingly, dampening water is supplied from the corresponding dampening water supply devices 21a, 21b, 21c, and 21d to the image regions 67a, 67b, 67c, and 67d, and the image region 67a is supplied from the ink supply device 20a. Black, magenta, cyan, and yellow inks are supplied to the image area 67b from the ink supply apparatus 20b, the image area 67c from the ink supply apparatus 20c, and the image area 67d from the ink supply apparatus 20d, respectively. This ink is then transferred to corresponding areas of the first and second blanket cylinders 13 and 14.
[0107]
  By repeating this operation, ink is supplied to the printing plate P and the first and second blanket cylinders 13 and 14 on the first and second plate cylinders 11 and 12. This ink supply operation is repeatedly executed until the printing process is completed.
[0108]
  When the ink supply to the printing plates P on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 is completed, the printing paper S is supplied as shown in FIG. Supply to the paper cylinder 16. The printing paper S is transferred from the paper feed cylinder 16 to the impression cylinder 15.
[0109]
  Then, if the impression cylinder 15 further rotates and the leading end of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the first blanket cylinder 13, the action of the cylinder insertion mechanism shown in FIG. The first blanket cylinder 13 is brought into a cylinder-inserted state in contact with the impression cylinder 15. In this state, as shown in FIG. 16, the leading edge of the printing paper S abuts on the edge of the area on the side used for printing black ink on the surface of the first blanket cylinder 13. Then, the black ink is transferred from the image area 67a of the printing plate P held on the first plate cylinder 11 to the area used for printing the black ink on the surface of the first blanket cylinder 13. Yes. For this reason, the black ink is transferred to the printing paper S by further rotating the first blanket cylinder 13 and the impression cylinder 15.
[0110]
  If the impression cylinder 15 further rotates and the leading edge of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the second blanket cylinder 14, the action of the cylinder insertion mechanism shown in FIG. The blanket cylinder 14 is brought into a cylinder-inserted state in contact with the impression cylinder 15. In this state, as shown in FIG. 17, the leading end of the printing paper S abuts on the end of the region on the surface of the second blanket cylinder 14 used for printing cyan ink. Then, cyan ink is transferred from the image area 67c of the printing plate P held by the second plate cylinder 12 to the area on the surface used for printing cyan ink on the surface of the second blanket cylinder 14. Yes. For this reason, when the second blanket cylinder 14 and the impression cylinder 15 are further rotated, the cyan ink is further transferred to the printing paper S on which the black ink has already been transferred.
[0111]
  When the impression cylinder 15 continues to rotate together with the first and second blanket cylinders 13 and 14 in this state, the printing paper S is completely wound around the outer periphery of the impression cylinder 15 as shown in FIG. It becomes. Since the impression cylinder 15 has a half diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14, the impression cylinder 15 is wound around the outer periphery of the impression cylinder 15. In the second rotation, the printed printing paper S comes into contact with the area on the surface of the first blanket cylinder 13 that is used for printing magenta ink. The magenta ink is transferred from the image area 67b of the printing plate P held on the first plate cylinder 11 to the area on the surface of the first blanket cylinder 13 used for printing magenta ink. Yes. For this reason, when the first blanket cylinder 13 and the impression cylinder 15 are further rotated, the magenta ink is further transferred to the printing paper S on which the black and cyan inks have already been transferred.
[0112]
  When the impression cylinder 15 further rotates, the printing paper S comes into contact with the end of the area on the second blanket cylinder 14 used for printing yellow ink. Then, the yellow ink is transferred from the image area 67d of the printing plate P held on the second plate cylinder 12 to the area on the surface of the second blanket cylinder 14 used for printing yellow ink. Yes. Therefore, when the second blanket cylinder 14 and the impression cylinder 15 are further rotated, the yellow ink is further transferred to the printing paper S on which the black, cyan, and magenta inks have already been transferred. Is completed.
[0113]
  The leading end portion of the printing paper S for which printing of four colors has been completed is transferred from the impression cylinder 15 to the paper discharge cylinder 17 as shown in FIG. Further, after the printing paper S to be printed next is supplied to the paper feed cylinder 16, it is transferred from the paper feed cylinder 16 to the impression cylinder 15.
[0114]
  Then, as shown in FIG. 20, the printing paper S for which the printing of the four colors has been completed is transported to the paper discharge unit 28 together with the gripper of the paper discharge cylinder 17 by the drive of the pair of chains 19 and discharged.
[0115]
  As described above, in this printing apparatus, the impression cylinder 15 has a diameter that is ½ of the diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. Therefore, the impression cylinder 15 rotates twice while the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 rotate once. Then, while the impression cylinder 15 rotates twice, the four colors of yellow, magenta, cyan, and black are printed on the printing paper S held on the outer periphery of the impression cylinder 15. For this reason, every time the impression cylinder 15 makes two revolutions, the new printing paper S is supplied from the paper feeding cylinder 16 so that the four colors can be continuously printed.
[0116]
  In this printing apparatus, instead of performing the above four-color printing, it is also possible to perform single-color printing or the like.
[0117]
  For example, when printing with only black ink in this printing press, the same image is formed in the image areas 67 a and 67 b in the printing plate P held by the first plate cylinder 11. The ink supply device 20a can supply black ink to both the image areas 67a and 67b. Further, the other ink supply devices 20b, 20c, and 20d are separated from the first and second plate cylinders 11 and 12, respectively. In this state, a new printing paper S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 makes one rotation. As a result, every time the impression cylinder 15 makes one rotation, an image of black ink from the image area 67a or 67b on which the same image is formed is transferred to the printing paper S held on the outer periphery of the impression cylinder 15, Monochromatic printing can be performed.
[0118]
  In this case, the second plate cylinder 12 and the second blanket cylinder 14 are not used. Therefore, the second blanket cylinder 14 may be removed from the body by the body insertion mechanism shown in FIG. Further, while printing is being performed using the first plate cylinder 11 and the first blanket cylinder 13, the second plate cylinder 12 is moved to the image recording position, and the second plate cylinder 12 is moved to this position. The plate making process may be executed above.
[0119]
  In the embodiment described above, the driven rollers 77 are moved from different directions as the first and second plate cylinders 11 and 12 move between the image recording positions and the first and second printing positions. Since it is configured to move to a position facing the body rotation mechanism 30, it is driven between the driving roller 76 and the driven roller 77 using a transmission roller 78 that can move between the drive transmission position and the retracted position. However, in the case where the single plate cylinder is moved to the position facing the plate cylinder rotating mechanism 30 only from one direction, the drive roller 76 directly moves to the driven roller 77. It is good also as a structure which transmits a drive.
[0120]
【The invention's effect】
  According to the first aspect of the present invention, in a printing apparatus that performs printing by recording an image on a printing plate and then making ink by supplying ink to the printing plate, the plate cylinder is placed between the image recording position and the printing position. The image recording device used in the plate making process of the printing plate and the ink supply device used in the printing process can be arranged at different positions that do not interfere with each other, Since the image can be recorded by rotating the plate cylinder by a drive transmission type plate cylinder rotating mechanism using frictional force at the image recording position, uneven rotation of the plate cylinder can be prevented during image recording. It becomes possible to record with high accuracy.
[0121]
  AlsoSince the plate cylinder rotating mechanism is employed in which the transmission roller is moved between a driving transmission position where the transmission roller is pressed against the driving roller and the driven roller and a retracted position separated from the driving roller and the driven roller, the driving roller and the driven roller are used. It is possible to reliably prevent slippage between the roller and the transmission roller and to accurately rotate the plate cylinder.
[0122]
  Claim2According to the invention described in the above, in the printing apparatus that performs printing by recording an image on a printing plate and then supplying ink to the printing plate, the first and second plate cylinders are set to the image recording position and the first recording plate. By moving between the second printing positions, an image can be recorded on the printing plates held on the first and second plate cylinders using a single image recording apparatus, and the printing plate is made. The image recording device used in the process and the ink supply device used in the printing process can be arranged at different positions so as not to interfere with each other, and the first and second images are recorded at the image recording position. Since the image can be recorded by rotating the plate cylinder by a drive transmission type plate cylinder rotating mechanism using frictional force, uneven rotation of the first and second plate cylinders can be prevented during image recording, An image can be recorded with high accuracy.
[0123]
  AlsoThe plate cylinder of the type in which the transmission roller is moved between a drive transmission position in pressure contact with the first or second driven roller and the driving roller and a retracted position separated from the driving roller and the first or second driven roller. By adopting the rotation mechanism, it is possible to reliably prevent slippage between the driving roller and the first or second driven roller moving from different directions to the vicinity of the driving roller and the transmission roller, and accurately rotate the plate cylinder. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a printing apparatus according to the present invention.
FIG. 2 is a front view of first and second plate cylinder moving mechanisms 31 and 32;
3 is a side sectional view showing the vicinity of a bearing portion 33 in the first plate cylinder moving mechanism 31. FIG.
FIG. 4 is a schematic diagram showing a relationship between a rotation preventing member 47 disposed in the first plate cylinder 11 and a release member 48 disposed in a first printing position.
FIG. 5 is a schematic diagram showing the relationship between a rotation preventing member 47 disposed in the first plate cylinder 11 and a release member 48 disposed in a first printing position.
FIG. 6 is a schematic diagram showing the relationship between a rotation preventing member 47 disposed in the first plate cylinder 11 and a release member 48 disposed in a first printing position.
FIG. 7 is a schematic view showing a rotation preventing member 47 disposed in the first plate cylinder 11 and a release member 49 disposed in an image recording position.
FIG. 8 is a front view of the vicinity of the plate cylinder rotating mechanism 30;
FIG. 9 is a side cross-sectional view showing the main part of FIG. 8;
FIG. 10 is an explanatory diagram showing an arrangement of an image area 67 on the printing plate P.
FIG. 11 is a schematic view showing a trunking mechanism of the first blanket cylinder 13;
FIG. 12 is a block diagram illustrating a main electrical configuration of the printing apparatus.
FIG. 13 is a flowchart showing an outline of plate making and printing operations by the printing apparatus.
FIG. 14 is a flowchart showing a plate making process.
FIG. 15 is an explanatory diagram illustrating a printing operation of the printing apparatus.
FIG. 16 is an explanatory diagram illustrating a printing operation of the printing apparatus.
FIG. 17 is an explanatory diagram illustrating a printing operation of the printing apparatus.
FIG. 18 is an explanatory diagram illustrating a printing operation of the printing apparatus.
FIG. 19 is an explanatory diagram illustrating a printing operation of the printing apparatus.
FIG. 20 is an explanatory diagram illustrating a printing operation of the printing apparatus.
FIG. 21 is a configuration diagram illustrating an outline of a conventional printing apparatus.
[Explanation of symbols]
  11 First plate cylinder
  12 Second plate cylinder
  13 First blanket cylinder
  14 Second blanket cylinder
  15 impression cylinder
  16 Feed cylinder
  17 Discharge cylinder
  20 Ink supply device
  21 Dampening water supply device
  23 Plate Supply Department
  24 Discarding part
  25 Image recording device
  26 Development processing equipment
  27 Feeder
  28 Paper discharge unit
  30 Plate cylinder rotation mechanism
  31 First plate cylinder moving mechanism
  32 Second plate cylinder moving mechanism
  33 Bearing part
  34 Bearing
  35 motor
  36 Spindle
  37 Side plate
  38 slots
  39 Guide members
  41 Slide holder
  44 Ball screw
  75 motor
  76 Driving roller
  77 Followed roller
  78 Transmission roller
  79 Oil Pan
  80 Air cylinder
  P printing plate
  S printing paper

Claims (2)

A printing apparatus for printing by recording an image on a printing plate and then supplying ink to the printing plate for printing,
A plate cylinder holding the printing plate on its outer periphery,
An image recording apparatus for recording an image on a printing plate held by the plate cylinder;
A plate cylinder moving mechanism for moving the plate cylinder between an image recording position facing the image recording apparatus and a printing position where printing is performed by a printing plate held on the plate cylinder;
A drive transmission type plate cylinder rotation mechanism that is disposed in the vicinity of the image recording position and uses a frictional force that rotates the plate cylinder at the image recording position ;
A drive transmission type plate cylinder rotating mechanism using the frictional force,
A driving roller that rotates by driving a motor;
A driven roller connected concentrically with the plate cylinder;
A transmission roller for transmitting drive from the drive roller to the driven roller;
A transmission roller moving mechanism that moves the transmission roller between a drive transmission position that is in pressure contact with the drive roller and the driven roller, and a retracted position that is separated from the drive roller and the driven roller;
Printing apparatus characterized by comprising a. A printing apparatus for printing by recording an image on a printing plate and then supplying ink to the printing plate for printing,
First and second plate cylinders that hold the printing plate on its outer periphery;
A single image recording device for recording an image on a printing plate held by the first and second plate cylinders;
The first plate cylinder is moved between an image recording position facing the image recording apparatus and a first printing position where printing is performed by a printing plate held on the first plate cylinder. A plate cylinder moving mechanism;
A second plate cylinder moving mechanism for moving the second plate cylinder between the image recording position and a second printing position where printing is performed by a printing plate held on the second plate cylinder;
A drive transmission type plate cylinder rotation mechanism that is disposed in the vicinity of the image recording position and uses frictional force that rotates the first plate cylinder or the second plate cylinder at the image recording position ;
A drive transmission type plate cylinder rotating mechanism using the frictional force,
A driving roller that rotates by driving a motor;
A first driven roller connected concentrically with the first plate cylinder;
A second driven roller connected concentrically with the second plate cylinder;
A transmission roller for transmitting drive from the drive roller to the first driven roller or the second driven roller;
The transmission roller is moved between a driving transmission position that is in pressure contact with the driving roller and the first or second driven roller, and a retracted position that is separated from the driving roller and the first or second driven roller. A transmission roller moving mechanism;
Printing apparatus characterized by comprising a.

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