JP2016047641A - Printing drum pair and offset rotary printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate cylinder and printing drum pair capable of suppressing vibration of the plate cylinder in a 4(W)×1(L) type offset rotary printer, and an offset rotary printer comprising the printing drum pair.SOLUTION: A columnar plate cylinder 10 comprising a peripheral surface having a printing region having length corresponding to 4 sheets in shorter side direction of a newspaper in axis direction and a printing region having length corresponding to one sheet in longer side direction of the newspaper comprises a first print plate equipping groove 11a extending in parallel with axis direction from one end part 10a to a center part 10c in axis direction and a second print plate equipping groove 11b extending in parallel with axis direction from the center part 10c to the other end part 10b. The first print plate equipping groove 11a and the second print plate equipping groove 11b are formed with a predetermined interval in circumferential direction of the plate cylinder 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plate cylinder and a printing cylinder pair used in an offset rotary printing press, and an offset rotary printing press including the printing cylinder pair.

  Conventionally, a printing unit used in a web offset press for newspapers includes an ink supply device having a large number of ink supply rollers, a plate cylinder on which a printing plate is mounted, and a blanket cylinder on which a blanket is mounted. The ink supplied from the ink supply device is supplied to the blanket cylinder through the plate cylinder, and is brought into contact with the continuous paper (printed body) on which the blanket cylinder travels at a predetermined pressure. Characters, images, etc.) are transferred.

  A conventional plate cylinder used in such a printing unit is formed with a printing plate mounting groove extending in the axial direction and an accommodating portion which is an internal space continuous to the printing plate mounting groove. One end of the printing plate is locked to the edge portion of the mounting groove, and the other end of the printing plate is pulled by the printing plate mounting locking member of the printing plate mounting device housed in the housing portion. It is configured to wrap the plate around the circumference. Similarly, the conventional blanket cylinder is also formed with a blanket mounting groove extending along the axial direction and an accommodating portion for accommodating the blanket mounting device, and the blanket is formed by the edge of the blanket mounting groove and the blanket mounting device. Is wound around the peripheral surface.

  In recent years, as an offset rotary printing press for newspapers, a plate cylinder having a circumferential surface of 4 (W) × 1 (L) (so-called 1-fold cylinder) and a circumferential surface of 4 (W) × 2 (L) An offset rotary printing press (hereinafter referred to as “4 (W) × 1 (L) type offset rotary printing press”) having a blanket cylinder having a so-called blanket cylinder (so-called double cylinder blanket cylinder) has been proposed (for example, a patent) Reference 1). Here, “4 (W) × 1 (L)” means that the peripheral surface of the cylinder is printed with a length (W) corresponding to four pages in the short side direction (horizontal width) of a newspaper (for example, blanket size). This means that it has an area in the axial direction and a printing area having a length (L) corresponding to one page in the long side direction (longitudinal direction) of the newspaper in the circumferential direction. In addition, “4 (W) × 2 (L)” means that the printing surface has a length (W) corresponding to four pages in the short side direction (horizontal width) of the newspaper (for example, blanket size) of the drum. In the axial direction, and a printing area having a length (L) corresponding to two pages in the long side direction (longitudinal direction) of the newspaper in the circumferential direction. Such a 4 (W) × 1 (L) type offset rotary printing press has a plate cylinder having a circumferential surface of 4 (W) × 2 (L) and a circumferential surface of 4 (W) × 2 (L). Compared to a general offset rotary printing press having a blanket cylinder, the amount of printing plates to be used can be reduced, and the rotary printing press can be reduced in size and weight, and power consumption can be reduced. It has various advantages that can be suppressed.

Japanese Patent No. 5465886

  However, in the conventional 4 (W) × 1 (L) type rotary offset printing press, the diameter of the plate cylinder is thin and easy to bend, and the plate mounting groove 112 is one end of the plate cylinder 110 as shown in FIG. A straight line is formed from 110a to the other end 110b. Therefore, the plate cylinder in a state in which the blanket cylinder 120 to which the printing blankets 104 and 104 are mounted and the plate cylinder 110 to which the printing plates 102 and 102 are mounted are rotating while contacting under a predetermined printing pressure. When the plate mounting groove 112 of the plate 110 faces the blanket cylinder 120, a printing pressure fluctuation occurs over the entire area of the plate cylinder 110 in the longitudinal direction. ) May cause printing troubles such as shock eyes and doubles. In particular, the 4 (W) × 1 (L) type offset rotary printing press disclosed in Patent Document 1 is used to suppress the transfer of residual ink from the plate cylinder 110 to the blanket cylinder 120, as shown in FIG. A concave portion 106 extending in the axial direction is provided in the central portion of the blanket 104 in the circumferential direction, and the plate cylinder 110 is mounted when the plate cylinder 110 and the blanket cylinder 120 rotate while contacting under printing pressure. The ends (the end on the side of the side and the end on the side of the tail) of the printing plates 102 and 102 that are mounted in the groove 112 face the blanket mounting groove 122 of the blanket cylinder 120 and the recess 106 of the blanket 104. It is configured as follows. In such a 4 (W) × 1 (L) type offset rotary printing press of Patent Document 1, not only the printing pressure fluctuation caused by the blanket mounting groove 122 of the blanket cylinder 120 but also the concave portion 106 of the blanket 104 is caused. Since printing pressure fluctuations also occur, the plate cylinder 110 is further vibrated further, and there is a possibility that printing troubles such as shock eyes and doubles may occur on the surface of the continuous paper (printed body). In addition, such vibration of the plate cylinder 110 may cause not only a printing failure but also damage to the plate cylinder 110 and a plate mounting device (not shown) built in the plate cylinder 110.

  The present invention has been made in view of the above-described problems of the prior art, and the object thereof is to suppress vibration of a plate cylinder in a 4 (W) × 1 (L) type offset rotary printing press. Another object of the present invention is to provide an offset rotary printing press including a printing cylinder and a printing cylinder pair and the printing cylinder pair.

  The plate cylinder according to the present invention has a printing area having a length corresponding to four pages in the short side direction of a newspaper in the axial direction, and printing having a length corresponding to one page in the long side direction of the newspaper. A cylindrical plate cylinder having a circumferential surface having a region in the circumferential direction, a first plate mounting groove extending in parallel with the axial direction from one axial end portion to the central portion, and an axial central portion A second printing plate mounting groove extending in parallel with the axial direction from the other end to the first printing plate mounting groove and the second printing plate mounting groove. It is characterized by being formed at predetermined intervals in the direction.

  In the plate cylinder according to the present invention, the first plate mounting groove and the second plate mounting groove may be formed at an interval of 180 degrees in the circumferential direction of the plate cylinder.

  Further, the printing cylinder pair according to the present invention has a printing area having a length corresponding to four pages in the short side direction of the newspaper in the axial direction and a length corresponding to one page in the long side direction of the newspaper. A cylindrical plate cylinder having a circumferential surface having a printing area in the circumferential direction, and a cylindrical blanket cylinder having a circumferential surface having a circumferential length that is an integral multiple of the circumferential length of the plate cylinder; A first printing plate mounting groove extending in parallel with the axial direction from one axial end portion to the central portion of the printing drum, and the first printing plate mounting. A second printing plate mounting groove formed at a predetermined interval in the circumferential direction of the plate cylinder with respect to the printing groove and extending in parallel with the axial direction from the axial center to the other end of the printing cylinder The blanket cylinder is attached to a first blanket extending parallel to the axial direction from one axial end portion to the central portion of the blanket cylinder. A groove is formed at a predetermined interval in the circumferential direction of the blanket cylinder with respect to the first blanket mounting groove, and is parallel to the axial direction from the axial center to the other end of the blanket cylinder. A second blanket mounting groove extending, the circumferential length of the blanket cylinder being X times the circumferential length of the plate cylinder, and the first printing plate mounting groove and the second When the interval between the printing plate mounting groove and the plate cylinder axis is α degrees, the distance between the first blanket mounting groove and the second blanket mounting groove is the same as that of the blanket cylinder. It is characterized by being configured to be α / X degrees around the axis.

  In the printing cylinder pair according to the present invention, the blanket cylinder has a circumferential length twice as long as a circumferential length of the plate cylinder, and the first printing plate mounting groove and the second printing plate. A mounting groove is formed at an interval of 180 degrees in the circumferential direction of the plate cylinder, and the first blanket mounting groove and the second blanket mounting groove are 90 degrees in the circumferential direction of the blanket cylinder. It may be formed with an interval of. In this case, each of the first blanket mounting groove and the second blanket mounting groove may be formed at intervals of 180 degrees in the circumferential direction of the blanket cylinder.

  In the printing cylinder pair according to the present invention, two or more of the first blanket mounting groove and the second blanket mounting groove are formed at an interval of 360 / X degrees in the circumferential direction of the blanket cylinder. It may be.

  An offset rotary printing press according to the present invention includes the above-described printing cylinder pair.

  According to the present invention, in a 4 (W) × 1 (L) type offset rotary printing press, a plate cylinder and a printing cylinder pair capable of suppressing vibration of the plate cylinder, and an offset rotary printing press provided with the printing cylinder pair. Can be provided.

It is a perspective view showing a schematic structure of a printing cylinder pair according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a state where the plate cylinder shown in FIG. 1 is rotated 180 degrees and the blanket cylinder is rotated 90 degrees. It is a schematic block diagram which shows the phase relationship of the 1st printing plate mounting groove | channel and the 2nd printing plate mounting groove | channel of the plate cylinder which concerns on 1st Embodiment. It is a schematic block diagram which shows the phase relationship of the 1st blanket mounting groove | channel and the 2nd blanket mounting groove | channel of the blanket cylinder which concerns on 1st Embodiment. It is process drawing which shows the operation | movement at the time of the printing operation of a pair of printing cylinder pair which concerns on 1st Embodiment. It is a perspective view which shows schematic structure of the printing cylinder pair which concerns on 2nd Embodiment of this invention. FIG. 7 is a perspective view showing a state where the plate cylinder shown in FIG. 6 is rotated 180 degrees and the blanket cylinder is rotated 90 degrees. The phase relationship between a pair of first blanket mounting grooves, the phase relationship between a pair of second blanket mounting grooves, and the phase of the first blanket mounting groove and the second blanket mounting groove of the blanket cylinder according to the second embodiment It is a schematic block diagram which shows a relationship. It is process drawing which shows the operation | movement at the time of the printing operation of a pair of printing cylinder pair which concerns on 2nd Embodiment. It is a perspective view which shows schematic structure of the conventional printing cylinder pair.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  First, an offset rotary printing press according to a first embodiment of the present invention will be described with reference to FIGS. The web offset printing press according to the first embodiment is a 4 (W) × 1 (L) type web offset printing press, and is a continuous paper supply for setting a roll paper obtained by winding a continuous paper (printed body) into a roll. A unit, a printing unit for performing offset printing on both sides of the continuous paper supplied from the continuous paper supply unit, and cutting the continuous paper after offset printing to form individual sheet-like sheets, and one sheet-like sheet Or a folding machine that folds a sheet-like sheet group composed of a plurality of sheet-like sheets to form a signature, and a post-processing mechanism that performs a predetermined process such as further folding the signature formed by the folding machine and stacks it. And one or a plurality of control units that execute various types of control. In the offset rotary printing press according to the first embodiment, various types of known continuous paper supply units, folding machines, post-processing mechanisms, and control units can be arbitrarily used, and descriptions thereof are omitted.

  The printing unit includes an ink supply device (not shown) having a large number of ink supply rollers, and a printing cylinder pair 1 that performs printing on a continuous paper (printed body) with ink supplied from the ink supply device. . As shown in FIGS. 1 and 2, the printing cylinder pair 1 includes a plate cylinder 10 to which the printing plates 12 and 14 are attached, and a blanket cylinder 20 to which the printing blankets 22 and 24 are attached. .

  This printing unit, like the conventional printing unit, rotates from the ink supply device by rotating the printing operation while the printing plates 12 and 14 of the plate cylinder 10 and the printing blankets 22 and 24 of the blanket cylinder 20 are in contact with each other. The supplied ink is supplied to the printing blankets 22 and 24 of the blanket cylinder 20 through the printing plates 12 and 14 of the plate cylinder 10, and the continuous paper (printed material) on which the printing blankets 22 and 24 run and a predetermined sheet. By contacting with pressure, the contents (characters, images, etc.) of the printing plates 12 and 14 are transferred to the continuous paper. In the printing unit according to the first embodiment, various well-known ink supply devices can be arbitrarily used, and the description thereof is omitted. 1, 2 and 5, only the plate cylinder body 11 and the printing plates 12 and 14 of the plate cylinder 10 and the blanket cylinder body 21 and the printing blankets 22 and 24 of the blanket cylinder 20 are illustrated. Mounting shafts provided at both ends of the cylinder main body 11 and the blanket cylinder main body 21, a printing plate mounting mechanism provided in the printing plate mounting grooves 11 a and 11 b of the plate cylinder 10, and a blanket mounting groove 21 a of the blanket cylinder 20. The blanket mounting mechanism and the like mounted in the 21b are not shown because various known structures can be adopted.

As shown in FIGS. 1 and 2, the plate cylinder 10 includes a plate cylinder main body 11 formed in a columnar shape, and two printing plates 12 and 14 mounted on the peripheral surface portion of the plate cylinder main body 11 in the axial direction. And. 2 shows a state in which the plate cylinder 10 has made a half turn (180 degree rotation) and the blanket cylinder 20 has made a quarter turn (90 degree rotation) from the state shown in FIG.

  The plate cylinder body 11 has a printing area having a length (W) corresponding to four pages in the short side direction (horizontal direction) of the newspaper in the axial direction, and 1 in the long side direction (longitudinal direction) of the newspaper. A circumferential surface having a printing area with a length (L) corresponding to a page in the circumferential direction, and so-called 4 (2), on which two printing plates 12 and 14 can be mounted side by side in the axial direction. W) × 1 (L) type rotator (single cylinder). The plate cylinder body 11 is provided with attachment shafts (not shown) at both ends thereof, and these attachment shafts are attached to a frame (not shown) via bearings (not shown). A rotational driving means (not shown) connected to the mounting shaft is configured to be rotationally driven at the same speed in synchronization with the peripheral speed of the blanket cylinder 20.

  Further, as shown in FIGS. 1 and 2, the plate cylinder main body 11 includes a first printing plate mounting groove 11a that opens from an axial end portion 10a to an axial central portion (substantially intermediate position) 10c. The second plate mounting groove 11b is formed to open from the axial center portion 10c to the axial other end portion 10b. The first printing plate mounting groove 11a and the second printing plate mounting groove 11b are grooves in which a printing plate mounting mechanism (not shown) is provided in the grooves, respectively. The length is approximately half of the length, specifically, the length corresponding to approximately two pages in the short side direction (lateral direction) of the newspaper, and is formed to extend in parallel with the axial direction of the plate cylinder body 11. ing.

  As shown in FIGS. 1 to 3, the first plate mounting groove 11 a and the second plate mounting groove 11 b are arranged in the circumferential direction of the plate cylinder body 11 so as not to be continuous in the axial direction of the plate cylinder body 11. It is formed by shifting the position (with a predetermined interval in the circumferential direction). That is, the second printing plate mounting groove 11b is formed by an arbitrary angle (α degrees) about the axis of the printing drum body 11 in the circumferential direction of the printing drum body 11 with respect to the first printing plate mounting groove 11a. It is formed by shifting the position. In the plate cylinder body 11 according to the first embodiment, the first printing plate mounting groove 11 a and the second printing plate mounting groove 11 b are 180 degrees (that is, α = 180 degrees) in the circumferential direction of the plate cylinder body 11. It is formed at intervals.

  The printing plates 12 and 14 are made of a metal-made flexible thin plate material and, as shown in FIGS. 1 and 2, are formed by bending an edge portion on one side in the longitudinal direction. And a tail edge side end portion 18 formed by bending an end edge portion on the other side in the longitudinal direction. The printing plates 12 and 14 have a width direction length that is approximately half of the axial length of the plate cylinder main body 11 and a length in the longitudinal direction that can be mounted around the outer peripheral surface of the plate cylinder main body 11. . Each of the printing plates 12 and 14 has a printing area in the width direction corresponding to two pages in the short side direction of the newspaper, and a length corresponding to one page in the long side direction of the newspaper. The printing area is in the longitudinal direction. Since the printing plates 12 and 14 can use known printing plates, detailed descriptions thereof are omitted. Further, the printing plates 12 and 14 may have a width direction length that is approximately one quarter of the axial length of the plate cylinder body 11. In this case, the peripheral surface of the plate cylinder body 11 may be used. Four parts are mounted in the portion in the axial direction.

  As shown in FIGS. 1 and 2, the printing plate 12 has the tail end 17 and the tail end 18 inserted in the first plate mounting groove 11 a of the plate cylinder body 11. The plate cylinder main body 11 on the side where the first plate mounting groove 11a is formed is pulled into the groove by a plate mounting mechanism (not shown) mounted in the first plate mounting groove 11a. It is comprised so that it may mount | wear with the state which was tense evenly on the outer peripheral surface. Further, as shown in FIGS. 1 and 2, the other printing plate 14 has the tail end 17 and the tail end 18 inserted in the second plate mounting groove 11 b of the plate cylinder body 11. The plate cylinder main body on the side where the second plate mounting groove 11b is formed by being pulled into the groove by a plate mounting mechanism (not shown) mounted in the second plate mounting groove 11b. It is comprised so that it may mount | wear with the state which was tense evenly on 11 outer peripheral surfaces.

  As shown in FIGS. 1 and 2, the blanket cylinder 20 includes a blanket cylinder body 21 formed in a columnar shape, and two printing blankets 22 that are mounted on the peripheral surface portion of the blanket cylinder body 21 in the axial direction. 24.

  The blanket cylinder main body 21 has an axial length that is substantially the same as the axial length of the plate cylinder main body 11 and is X times the circumferential length of the plate cylinder main body 11 (X is an arbitrary number of 2 or more). It is a cylindrical rotating body having a circumferential length of an integer). In the first embodiment, the blanket cylinder main body 21 has a printing area with a length (W) corresponding to four pages in the short side direction (lateral direction) of the newspaper in the axial direction, and the long side direction of the newspaper. It has a circumferential surface having a printing area with a length (L) corresponding to two pages in the (vertical direction) in the circumferential direction, and two printing blankets 22 and 24 are mounted on the circumferential surface portion side by side in the axial direction. This is a so-called 4 (W) × 2 (L) type rotating body (double cylinder). The blanket cylinder body 21 is provided with attachment shafts (not shown) at both ends thereof, and these attachment shafts are attached to a frame (not shown) via bearings (not shown). A rotational drive means (not shown) connected to the mounting shaft is configured to be rotationally driven at the same speed in synchronization with the peripheral speed of the plate cylinder 10.

  Further, as shown in FIGS. 1 and 2, the blanket cylinder body 21 includes a first blanket mounting groove 21a that opens from an axial end portion 20a to an axial central portion (substantially intermediate position) 20c, A second blanket mounting groove 21b is formed to open from the axial center 20c to the other axial end 20b. Each of the first blanket mounting groove 21a and the second blanket mounting groove 21b is a groove in which a blanket mounting mechanism (not shown) is provided in the groove, and the length of the blanket cylinder main body 21 in the axial direction is substantially the same. The half length, specifically, the length corresponding to approximately two pages in the short side direction (lateral direction) of the newspaper, is formed so as to extend parallel to the axial direction of the blanket cylinder body 21.

  The first blanket mounting groove 21a is formed at a circumferential position corresponding to the first printing plate mounting groove 11a of the plate cylinder 10, and the second blanket mounting groove 21b is formed on the second printing plate mounting of the plate cylinder 10. It is formed at a circumferential position corresponding to the groove 11b. Specifically, as shown in FIGS. 1, 2, and 4, the first blanket mounting groove 21 a and the second blanket mounting groove 21 b have a length in the circumferential direction of the blanket cylinder body 21 that is the plate cylinder body 11. And the distance between the first printing plate mounting groove 11 a and the second printing plate mounting groove 11 b is α degrees around the axis of the plate cylinder body 11. Further, the blanket cylinder so that the distance between the first blanket mounting groove 21 a and the second blanket mounting groove 21 b is “α / X” degrees (β in FIG. 4) about the axis of the blanket cylinder body 21. The position is shifted in the circumferential direction of the main body 21. In the printing cylinder pair 1 according to the first embodiment, the circumferential length of the blanket cylinder body 21 is twice the circumferential length of the plate cylinder body 11 (that is, X = 2), and the first printing plate is mounted. Since the gap between the groove 11a and the second printing plate mounting groove 11b is 180 degrees (ie, α = 180), the distance between the first blanket mounting groove 21a and the second blanket mounting groove 21b is the blanket. It is set to be 90 degrees (that is, β = 90) with the axis of the trunk body 21 as the center. That is, in the blanket cylinder body 21 according to the first embodiment, the second blanket mounting groove 21b is 90 degrees in the circumferential direction of the blanket cylinder body 21 with respect to the first blanket mounting groove 21a as shown in FIG. Are formed at intervals of.

  The printing blankets 22 and 24 are sheet-like blankets each including a base fabric layer made of a cloth sheet material and an elastic layer laminated on the base fabric layer. As shown in FIGS. Attachment portions 26 and 28 for the blanket cylinder main body 21 are provided at the respective end portions. The printing blankets 22 and 24 have a width direction length that is substantially half of the axial direction length of the blanket cylinder body 21 and a longitudinal length that can be mounted around the outer peripheral surface of the blanket cylinder body 21. . Specifically, each of the printing blankets 22 and 24 has a length corresponding to two pages in the short side direction of the newspaper in the width direction, and corresponds to two pages in the long side direction of the newspaper. It has a length in the longitudinal direction. Since the printing blankets 22 and 24 can be publicly known blankets, detailed description thereof is omitted. Further, the printing blankets 22 and 24 may have a width direction length that is approximately one quarter of the axial direction length of the blanket cylinder body 21. Four pieces are mounted on the surface portion in the axial direction.

  As shown in FIGS. 1 and 2, one printing blanket 22 has mounting portions 26 and 28 inserted into the first blanket mounting groove 21a of the blanket cylinder body 21, and into the first blanket mounting groove 21a. By being pulled into the groove by an equipped blanket mounting mechanism (not shown), the blanket body is mounted in an evenly tensioned state on the outer peripheral surface of the blanket cylinder body 21 on the side where the first blanket mounting groove 21a is formed. It is configured as follows. In addition, as shown in FIGS. 1 and 2, the other printing blanket 24 has mounting portions 26 and 28 inserted into the second blanket mounting groove 21b of the blanket cylinder body 21, and the second blanket mounting groove 21b. By being pulled into the groove by a blanket mounting mechanism (not shown) installed therein, it is mounted in an evenly tensioned state on the outer peripheral surface of the blanket cylinder body 21 on the side where the second blanket mounting groove 21b is formed. It is configured to be.

  As shown in FIGS. 5A to 5D, the offset rotary printing press according to the first embodiment has a plate cylinder 10 on which the printing plates 12 and 14 are mounted and printing blankets 22 and 24. The blanket cylinders 20 are combined as a pair of printing cylinders 1, and during printing operation, the two pairs of printing cylinders 1 are arranged on the outer peripheral surfaces of the printing blankets 22 and 24 mounted on the blanket cylinders 20. For example, they are configured to be pressed and brought into contact with each other via the printing medium W, which is continuous paper, and the contact positions of the peripheral surfaces are displaced and rotated in the direction in which the printing medium W travels.

  Specifically, as shown in FIGS. 5A to 5D, both blanket cylinders 20 and 20 are arranged so that the first blanket mounting grooves 21a and 21a and the second blanket mounting grooves 21a and 21a, The blanket mounting grooves 21b and 21b are arranged so as to face each other with the printing medium W interposed therebetween. Both blanket cylinders 20 and 20 are driven and controlled to rotate at the same speed in opposite directions.

  As shown in FIGS. 5A to 5D, each plate cylinder 10 includes printing blankets 22 and 24 in which the plate surfaces of the printing plates 12 and 14 mounted on the plate cylinder 10 are mounted on the blanket cylinder 20. The blanket cylinders 20 are arranged close to each other so as to be in contact with the outer peripheral surface of the blanket cylinder. Each plate cylinder 10 is rotated at the same speed in the opposite direction to the corresponding blanket cylinder 20, that is, the contact peripheral surfaces of the printing plates 12 and 14 and the outer peripheral surfaces of the printing blankets 22 and 24 are in the same direction. The drive is controlled so as to be displaced and rotated. In the printing cylinder pair 1 according to the first embodiment, since the plate cylinder 10 is a single cylinder and the blanket cylinder 20 is a double cylinder, the plate cylinder 10 rotates twice when the blanket cylinder 20 makes one rotation. It is configured as follows.

  Each plate cylinder 10 has a first blanket mounting groove 11a in the first blanket mounting groove 21a of the blanket cylinder 20, as shown in FIG. As shown in FIG. 5D, the second printing plate mounting groove 11b is opposed to the second blanket mounting groove 21b of the blanket cylinder 20 at the second rotational position during the printing operation rotation. It is arranged to be in a relationship. 5A shows a state in which the first printing plate mounting groove 11a of the plate cylinder 10 is opposed (opposed) to the first blanket mounting groove 21a of the blanket cylinder 20, and FIG. FIG. 5A shows a state in which the plate cylinder 10 has made a half rotation (180 degrees rotation) and the blanket cylinder 20 has made a quarter rotation (90 degrees rotation) from the state shown in FIG. 5 (c) is based on the state shown in FIG. 5 (b), and FIG. 5 (d) is based on the state shown in FIG. 5 (c). ) And the blanket cylinder 20 is shown in a state in which it is rotated by a quarter (90 degrees). In the printing cylinder pair 1 according to the first embodiment, the plate cylinder 10 and the blanket cylinder 20 are arranged so as to have such a phase relationship, so that, for example, as shown in FIG. At the first rotational position where the first printing plate mounting groove 11 a faces the first blanket mounting groove 21 a of the blanket cylinder 20, the second printing plate mounting groove 11 b of the plate cylinder 10 is mounted on the second blanket of the blanket cylinder 20. On the other hand, the second printing plate mounting groove 11b of the plate cylinder 10 is opposed to the second blanket mounting groove 21b of the blanket cylinder 20, as shown in FIG. In the rotational position, the first printing plate mounting groove 11 a of the plate cylinder 10 can be configured not to oppose the first blanket mounting groove 21 a of the blanket cylinder 20.

  As described above, the plate cylinder 10 according to the first embodiment has a printing area having a length corresponding to four pages in the short side direction of the newspaper in the axial direction and one page in the long side direction of the newspaper. A cylindrical plate cylinder having a circumferential surface having a printing area having a length corresponding to a minute in the circumferential direction, and extending in parallel with the axial direction from one end portion 10a in the axial direction to the central portion 10c. There are a mounting groove 11a and a second printing plate mounting groove 11b extending in parallel with the axial direction from the axial center 10c to the other end 10b. The plate mounting groove 11 b is formed at a predetermined interval in the circumferential direction of the plate cylinder 10. According to such a plate cylinder 10, grooves formed on the plate cylinder 10 side (first printing plate mounting groove 11 a and second printing plate mounting groove 11 b) and grooves formed on the blanket cylinder 20 side (first The fluctuation of the printing pressure caused by the first blanket mounting groove 21a and the second blanket mounting groove 21b) can be minimized, and the vibration of the plate cylinder 10 during the printing operation rotation can be suppressed. It is possible to drastically reduce the occurrence of printing troubles such as doubles and the occurrence of damage to the plate cylinder 10 and its built-in members.

  That is, for example, in the conventional plate cylinder 110 shown in FIG. 10, as described above, the plate mounting groove 112 is formed in a straight line from one end 110a to the other end 110b of the plate cylinder 110. Therefore, whenever the printing plate mounting groove 112 of the plate cylinder 110 faces the blanket cylinder 120 during printing operation rotation, a printing pressure fluctuation occurs over the entire area in the longitudinal direction of the plate cylinder 110, and this impact causes the plate cylinder 110 to move. Vibrates greatly. On the other hand, in the plate cylinder 10 according to the first embodiment, the plate cylinder main body 11 so that the first printing plate mounting groove 11 a and the second printing plate mounting groove 11 b are not continuous in the axial direction of the plate cylinder main body 11. Thus, one of the first printing plate mounting groove 11a and the second printing plate mounting groove 11b is formed as a groove in the blanket cylinder 20 (first blanket mounting groove). 21a or the second blanket mounting groove 21b), the other of the first printing plate mounting groove 11a and the second printing plate mounting groove 11b does not face the groove of the blanket cylinder 20. According to the plate cylinder 10 according to the first embodiment, for example, the first printing plate mounting groove 11a faces the first blanket mounting groove 21a of the blanket cylinder 20, and the first printing plate mounting groove 11a is formed. Even if the transfer pressure on the formed side is momentarily lost, the transfer pressure on the side on which the second printing plate mounting groove 11b is formed can be maintained, so that vibration of the plate cylinder 10 is effectively suppressed. Can do.

  Next, an offset rotary printing press according to a second embodiment of the present invention will be described with reference to FIGS. In the offset rotary printing press according to the second embodiment, the configuration other than the blanket cylinder 50 can adopt the same configuration as that of the offset rotary press according to the first embodiment. By using the same reference numerals as those in the first embodiment, description thereof is omitted, and description of other components is omitted.

  As shown in FIGS. 6 and 7, the blanket cylinder 50 according to the second embodiment is arranged in a circumferential direction and an axial direction on a blanket cylinder body 51 formed in a columnar shape and a peripheral surface portion of the blanket cylinder body 51. A total of four printing blankets 52, 52 ', 54, 54' mounted two by two.

  The blanket cylinder body 51 has an axial length that is substantially the same as the axial length of the plate cylinder body 11 and is X times the circumferential length of the plate cylinder body 11 (X is an arbitrary number of 2 or more). It is a cylindrical rotating body having a circumferential length of an integer). In the second embodiment, the blanket cylinder main body 51 has a printing area having a length (W) corresponding to four pages in the short side direction (horizontal direction) of the newspaper in the axial direction, and the long side direction of the newspaper. A printing blanket 52 having a circumferential surface having a printing area of a length (L) corresponding to two pages in the (vertical direction) in the circumferential direction and two circumferentially and axially arranged on the circumferential surface portion. , 52 ′, 54, 54 ′ is a so-called 4 (W) × 2 (L) type rotating body (double cylinder). The blanket cylinder body 51 is provided with attachment shafts (not shown) at both ends thereof, and these attachment shafts are attached to a frame (not shown) via bearings (not shown). A rotational drive means (not shown) connected to the mounting shaft is configured to be rotationally driven at the same speed in synchronization with the peripheral speed of the plate cylinder 10.

  Further, as shown in FIGS. 6 and 7, the blanket cylinder main body 51 includes first blanket mounting grooves 51a and 51a that open from the axial one end 50a to the axial central portion (substantially intermediate position) 50c. ′ And a pair of second blanket mounting grooves 51b and 51b ′ that open from the axial center portion 50c to the axial other end portion 50b are formed. These first blanket mounting grooves 51 a and 51 a ′ and second blanket mounting grooves 51 b and 51 b ′ are grooves provided with blanket mounting mechanisms (not shown) in the grooves, respectively. The length is approximately half of the axial length, specifically, the length corresponding to approximately two pages in the short side direction (lateral direction) of the newspaper, and extends in parallel with the axial direction of the blanket cylinder body 51. It is formed as follows.

  The first blanket mounting grooves 51a and 51a 'are respectively formed in circumferential positions corresponding to the first printing plate mounting grooves 11a of the plate cylinder 10, and the second blanket mounting grooves 51b and 51b' are respectively formed. The plate cylinder 10 is formed at a circumferential position corresponding to the second printing plate mounting groove 11b.

  Specifically, the first blanket mounting grooves 51 a and 51 a ′ and the second blanket mounting grooves 51 b and 51 b ′ are such that the circumferential length of the blanket cylinder body 51 is equal to the circumferential length of the plate cylinder body 11. In the case of X times, X pieces are formed at intervals of “360 / X” degrees (γ in FIG. 8) in the circumferential direction of the blanket cylinder 50. In the printing cylinder pair 1 ′ according to the second embodiment, the circumferential length of the blanket cylinder body 51 is 2 as the circumferential length of the plate cylinder body 11, as in the printing cylinder pair 1 according to the first embodiment. Therefore, the first blanket mounting grooves 51a and 51a ′ and the second blanket mounting grooves 51b and 51b ′ are 180 degrees in the circumferential direction of the blanket cylinder 50 (that is, γ). = 180) are formed at intervals of two.

  The first blanket mounting grooves 51 a and 51 a ′ and the second blanket mounting grooves 51 b and 51 b ′ are such that the circumferential length of the blanket cylinder body 51 is X times the circumferential length of the plate cylinder body 11. And the first blanket adjacent in the circumferential direction when the interval between the first printing plate mounting groove 11a and the second printing plate mounting groove 11b is α degrees around the axis of the plate cylinder main body 11. The spacing between the mounting groove (51a or 51a ′) and the second blanket mounting groove (51b or 51b ′) is “α / X” degrees (β in FIG. 8) about the axis of the blanket cylinder body 51, respectively. ) So that the position of the blanket cylinder body 51 is shifted in the circumferential direction. In the printing cylinder pair 1 ′ according to the second embodiment, the circumferential length of the blanket cylinder body 51 is 2 as the circumferential length of the plate cylinder body 11, as in the printing cylinder pair 1 according to the first embodiment. Since the distance between the first printing plate mounting groove 11a and the second printing plate mounting groove 11b is 180 degrees (that is, α = 180) at double (that is, X = 2), the first printing plate mounting groove 11a and the second printing plate mounting groove 11b are adjacent to each other in the circumferential direction. The distance between the first blanket mounting groove (51a or 51a ′) and the second blanket mounting groove (51b or 51b ′) is 90 degrees (ie, β = 90) about the axis of the blanket cylinder body 51, respectively. It is set to become. That is, in the blanket cylinder body 51 according to the second embodiment, as shown in FIG. 8, one second blanket mounting groove 51 b has a circumference of the blanket cylinder body 51 with respect to one first blanket mounting groove 51 a. The other second blanket mounting groove 51b 'is formed at an interval of 90 degrees in the circumferential direction of the blanket cylinder body 51 with respect to the other first blanket mounting groove 51a'. Formed.

  The printing blankets 52, 52 ′, 54, 54 ′ are sheet-like blankets each including a base fabric layer made of a cloth sheet material and an elastic layer laminated on the base fabric layer. As shown, attachment portions 56 and 58 for the blanket cylinder body 51 are provided at each end in the longitudinal direction. The printing blankets 52, 52 ′, 54, 54 ′ can cover a width direction length that is approximately half the axial length of the blanket cylinder body 51 and a region that is approximately half the outer peripheral surface of the blanket cylinder body 51. A longitudinal length. Specifically, each of the printing blankets 52, 52 ′, 54, 54 ′ has a length corresponding to two pages in the short side direction of the newspaper in the width direction, and in the long side direction of the newspaper. It has a length corresponding to one page in the longitudinal direction. The printing blankets 52, 52 ′, 54, 54 ′ can use known blankets, and thus detailed description thereof is omitted. Further, the printing blankets 52, 52 ', 54, 54' may have a width direction length that is approximately one quarter of the axial length of the blanket cylinder body 51. In this case, A total of eight are mounted on the peripheral surface portion of the blanket cylinder main body 51, two in the circumferential direction and four in the axial direction.

  As shown in FIGS. 6 and 7, the printing blanket 52, 52 ′ mounted on the outer peripheral surface of the blanket cylinder body 51 on the side where the first blanket mounting grooves 51a, 51a ′ are formed has one mounting portion. 56 is inserted into one of the first blanket mounting grooves 51a and 51a ', and the other mounting portion 58 is inserted into either one of the first blanket mounting grooves 51a and 51a'. The blanket mounting mechanism (not shown) provided in each of the mounting grooves 51a and 51a ′ is pulled into the groove to be mounted on the outer peripheral surface of the blanket cylinder body 51 in an evenly tensioned state. ing. Further, as shown in FIGS. 6 and 7, the printing blankets 54 and 54 ′ to be mounted on the outer peripheral surface of the blanket cylinder body 51 on the side where the second blanket mounting grooves 51b and 51b ′ are formed, With the mounting portion 56 inserted into one of the second blanket mounting grooves 51b and 51b ′ and the other mounting portion 58 inserted into either the second blanket mounting groove 51b and 51b ′, 2 The blanket mounting mechanism (not shown) provided in each of the blanket mounting grooves 51b and 51b ′ is pulled into the groove so that the blanket cylinder body 51 is mounted in an evenly tensioned state. It is configured.

  As shown in FIGS. 9A to 9D, the offset rotary printing press according to the second embodiment includes a plate cylinder 10 on which the printing plates 12 and 14 are mounted, and printing blankets 52, 52 ′, The blanket cylinders 50 to which the 54, 54 'are mounted are combined as a pair of printing cylinders 1', and two sets of printing cylinders 1 'are combined with each blanket cylinder 50 during printing operation. The outer peripheral surfaces of the blankets 52, 52 ′, 54, 54 ′ are pressed and brought into contact with each other via, for example, a printing medium W that is continuous paper, and the contact positions of the peripheral surfaces cause the printing medium W to travel. It is configured to rotate by being displaced in the direction.

  Specifically, as shown in FIGS. 9A to 9D, both blanket cylinders 50, 50 are provided with first blanket mounting grooves 51a, 51a ′, 51a, 51a ′ during printing operation rotation. And the second blanket mounting grooves 51b, 51b ′, 51b, 51b ′ are arranged in a relationship of being opposed to each other via the printing medium W. Both blanket cylinders 50 and 50 are driven and controlled to rotate at the same speed in opposite directions.

  As shown in FIGS. 9A to 9D, each plate cylinder 10 includes printing blankets 52 and 52 in which the plate surfaces of the printing plates 12 and 14 mounted on the plate cylinder 10 are mounted on the blanket cylinder 50. The blanket cylinders 50 are arranged close to each other so as to be in contact with the outer peripheral surfaces of ', 54, 54'. Each plate cylinder 10 is rotated at the same speed in the opposite direction as the corresponding blanket cylinder 50, that is, the plate surface of the printing plates 12 and 14 and the outer peripheral surface of the printing blanket 52, 52 ', 54, 54'. Drive control is performed so that the peripheral surface is displaced in the same direction and rotates. In the printing cylinder pair 1 ′ according to the second embodiment, since the plate cylinder 10 is a single cylinder and the blanket cylinder 50 is a double cylinder, the plate cylinder 10 rotates twice when the blanket cylinder 50 makes one rotation. It is configured to

  Each plate cylinder 10 has a first plate mounting groove 11a for mounting the first blanket on one side of the blanket cylinder 50 as shown in FIG. As shown in FIG. 9 (b), the second printing plate mounting groove 11b is located in the blanket cylinder at a rotational position where the plate cylinder 10 is half-rotated (rotated 180 degrees) from the first rotational position. As shown in FIG. 9 (c), the first printing plate is located at a rotational position opposite to the second blanket mounting groove 51b of 50 and the plate cylinder 10 is further rotated halfway (180 degrees) from this rotational position. In the rotational position where the mounting groove 11a is opposed to the other first blanket mounting groove 51a 'of the blanket cylinder 50 and the plate cylinder 10 is further rotated halfway (180 degrees) from this rotational position, FIG. As shown, the second Plate mounting groove 11b are arranged so as to be opposed phase relationship with the other of the second blanket attachment groove 51b' of the blanket cylinder 50.

  In the printing cylinder pair 1 ′ according to the second embodiment, the plate cylinder 10 and the blanket cylinder 50 are arranged so as to have such a phase relationship, and similarly to the printing cylinder pair 1 according to the first embodiment, FIG. 9 (a) and 9 (c), at the rotational position where the first plate mounting groove 11a of the plate cylinder 10 faces the first blanket mounting grooves 51a, 51a 'of the blanket cylinder 50, the plate The second printing plate mounting groove 11b of the cylinder 10 does not oppose the second blanket mounting grooves 51b, 51b 'of the blanket cylinder 50, while the plate as shown in FIGS. 9 (b) and 9 (d). At the rotational position where the second printing plate mounting groove 11 b of the cylinder 10 faces the second blanket mounting grooves 51 b and 51 b ′ of the blanket cylinder 50, the first printing plate mounting groove 11 a of the plate cylinder 10 is formed on the blanket cylinder 50. First blanket mounting grooves 51a, 5 Can be a'not facing configuration. For this reason, according to the offset rotary printing press according to the second embodiment, similarly to the offset rotary press according to the first embodiment, the grooves formed on the plate cylinder 10 side (the first press plate mounting grooves 11a and 11). The second printing plate mounting groove 11b) and the grooves formed on the blanket cylinder 50 side (first blanket mounting grooves 51a and 51a 'and second blanket mounting grooves 51b and 51b') are suppressed. Since the vibration of the plate cylinder 10 during the rotation of the printing operation can be suppressed, it is possible to reduce printing failures such as shock eyes and doubles, and damage to the plate cylinder 10 and its built-in members.

  In the offset rotary printing press according to the second embodiment, the first blanket mounting grooves 51 a and 51 a ′ and the second blanket mounting grooves 51 b and 51 b ′ are 180 degrees in the circumferential direction of the blanket cylinder 50 (“ 360 / X "degrees), and two (X pieces) are formed. According to such an offset rotary printing press, the ink remaining on the surface of the printing plates 12, 14 near the folding position of the printing plates 12, 14 is transferred to the surfaces of the printing blankets 52, 52 ', 54, 54'. This can effectively prevent the residual ink from being printed on the surface of the printing medium W via the printing blankets 52, 52 ′, 54, 54 ′. it can.

  That is, normally, when a printing operation is performed using a plate cylinder having a plate mounting groove, an ink supply device that rotates by being pressed against the plate surface of the plate mounted on the plate cylinder by the rotation of the printing cylinder pair. Ink is supplied to the plate surface of the printing plate by the ink supply roller. The ink supply roller presses the outer peripheral surface of the printing plate with the pressing pressure every time the peripheral surface with the plate mounting groove reaches the position where the plate cylinder rotates and the ink supply roller is pressed. The operation of dropping from one edge of the dent formed along the plate mounting groove and then riding on the plate surface from the other edge of the dent is repeated. Then, when climbing onto the printing plate surface, the ink supply roller comes into impact contact with the folding position of the printing plate that forms the ridges along the other edge of the recess, thereby folding the printing plate. Ink remains on the plate surface near the bending position. For this reason, in a normal offset rotary printing press that does not take measures to suppress transfer to residual ink, the ink remaining on the edge of the printing plate is printed on the surface of the printing medium via the printing blanket, and printing There is a risk of quality degradation.

  In contrast, in the offset rotary printing press according to the second embodiment, as shown in FIGS. 9A to 9D, the first printing plate mounting groove 11a and the second printing plate mounting of the plate cylinder 10 are provided. Since the groove 11b, the first blanket mounting grooves 51a and 51a 'of the blanket cylinder 50 and the second blanket mounting grooves 51b and 51b' are configured to coincide with each other during printing operation rotation, It is possible to effectively prevent the ink remaining on the printing plates 12 and 14 near the folding position from being transferred to the surfaces of the printing blankets 52, 52 ', 54 and 54'. It is possible to effectively prevent the ink from being printed on the surface of the printing medium W via the printing blankets 52, 52 ′, 54, 54 ′.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the scope described in the above-described embodiment. Various modifications or improvements can be added to the above embodiments.

  For example, in the description of the embodiment described above, the printing blanket has been described as including a base fabric layer made of a cloth sheet material and an elastic layer laminated on the base fabric layer, but is not limited thereto. Various printing blankets can be used.

  In the above description of the embodiment, the blanket cylinders 20 and 50 are described as being double cylinders having a circumferential surface of 4 (W) × 2 (L). The circumference may be an integer multiple of the circumference of the plate cylinder.

  Furthermore, in the description of the above-described embodiment, it is assumed that the first printing plate mounting groove 11a and the second printing plate mounting groove 11b are formed at an interval of 180 degrees in the circumferential direction of the plate cylinder main body 11. However, the present invention is not limited to this, and the interval between the first printing plate mounting groove 11a and the second printing plate mounting groove 11b can be arbitrarily set.

  1 printing cylinder pair, 10 printing cylinder, 11a first printing plate mounting groove, 11b second printing plate mounting groove, 20, 50 blanket cylinder, 21a, 51a, 51a ′ first blanket mounting groove, 21b, 51b, 51b 'second blanket mounting groove

Claims (7)

A circumferential surface having a printing area in the axial direction corresponding to four pages in the short side direction of the newspaper in the axial direction and a printing area having a length corresponding to one page in the long side direction of the newspaper in the circumferential direction A cylindrical plate cylinder having
A first printing plate mounting groove extending parallel to the axial direction from one axial end portion to the central portion, and a second printing plate mounting extending parallel to the axial direction from the central axial portion to the other end portion. Having a groove,
The plate cylinder, wherein the first plate mounting groove and the second plate mounting groove are formed at predetermined intervals in the circumferential direction of the plate cylinder. The plate cylinder according to claim 1,
The plate cylinder, wherein the first plate mounting groove and the second plate mounting groove are formed at an interval of 180 degrees in the circumferential direction of the plate cylinder. A circumferential surface having a printing area in the axial direction corresponding to four pages in the short side direction of the newspaper in the axial direction and a printing area having a length corresponding to one page in the long side direction of the newspaper in the circumferential direction A printing cylinder pair, and a cylindrical blanket cylinder having a circumferential surface having a circumferential length that is an integral multiple of the circumferential length of the printing cylinder,
The plate cylinder includes a first printing plate mounting groove extending in parallel with the axial direction from one axial end portion to a central portion of the printing drum, and the plate cylinder with respect to the first printing plate mounting groove. A second plate mounting groove formed at a predetermined interval in the circumferential direction and extending in parallel with the axial direction from the axial center to the other end of the plate cylinder;
The blanket cylinder includes a first blanket mounting groove extending in parallel with the axial direction from one axial end portion to a central portion of the blanket cylinder, and a circumferential direction of the blanket cylinder with respect to the first blanket mounting groove. And a second blanket mounting groove extending in parallel with the axial direction from the axial center to the other end of the blanket cylinder,
The circumferential length of the blanket cylinder is X times the circumferential length of the plate cylinder, and the distance between the first plate mounting groove and the second plate mounting groove is the plate cylinder. The distance between the first blanket mounting groove and the second blanket mounting groove is α / X degrees about the blanket cylinder axis, where α is about the axis. A printing cylinder pair characterized by that. A printing cylinder pair according to claim 3,
The blanket cylinder has a circumferential length twice as long as the circumferential length of the plate cylinder;
The first plate mounting groove and the second plate mounting groove are formed at an interval of 180 degrees in the circumferential direction of the plate cylinder,
The printing cylinder pair, wherein the first blanket mounting groove and the second blanket mounting groove are formed at an interval of 90 degrees in the circumferential direction of the blanket cylinder. A printing cylinder pair according to claim 3,
Two or more of the first blanket mounting groove and the second blanket mounting groove are formed at intervals of 360 / X degrees in the circumferential direction of the blanket cylinder. The printing cylinder pair according to claim 4,
Each of the first blanket mounting groove and the second blanket mounting groove is formed at two intervals of 180 degrees in the circumferential direction of the blanket cylinder. An offset rotary printing press comprising the printing cylinder pair according to any one of claims 3 to 6.

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