JP2009096097A - Offset printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain the structural enlargement and complication of the whole printing machine and to easily and quickly perform operation of separating a printing cylinder from an ink supply device and returning them into an original externally-contacting state. <P>SOLUTION: This offset printing machine includes an impression cylinder 5 and a blanket cylinder 6 in a circumscribed arrangement for holding a supply line of printed matter W; the printing cylinder 7 is circumscribed about the blanket cylinder; and attaching rollers 12 of the ink supply device 10 provided in external contact with the printing cylinder. The offset printing machine comprises a contacting/separating mechanism 15 for allowing the printing cylinder 7 to get into contact and separate with/from the attaching rollers 12 of the ink supply device 10, allowing the blanket cylinder 6 to get into contact and separate with/from the printing cylinder 7 and allowing the impression cylinder 5 to get into contact and separate with/from the blanket cylinder 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an offset printing machine.

An offset printing machine is provided with a pressure cylinder and a rubber cylinder in a circumscribed arrangement that sandwiches a supply line of a printing material, a plate cylinder is circumscribed on the rubber cylinder, and a form roller of an ink supply device and a water roller of a water supply device are connected to the plate. It is configured to be circumscribed by the cylinder, and by supplying ink from the ink supply device and water from the water supply device to the plate attached to the outer peripheral surface of the plate cylinder, The ink is transferred to a blanket provided on the outer peripheral surface of the rubber cylinder, and transferred from the rubber cylinder to a printed material in a backup state on the impression cylinder.
As described above, many printing presses having a plurality of cylinders for printing on a printing material have a mechanism for separating both the ink supply device and the water supply device from the plate cylinder for maintenance during non-printing. ing. As a method of separating the ink supply device and the water supply device, a method of separating the ink supply device and the water supply device along the axial direction of the plate cylinder (for example, see Patent Document 1) and a method of separating the ink supply device and the water supply device in the radial direction of the plate cylinder (for example, Patent Document 2) See).

As a means of operation, the ink supply device and the water supply device should be separated from the plate cylinder as described above for the reason that the ink supply to the plate cylinder is stopped, such as when it takes time for maintenance or a break. was there.
JP 2007-38675 A JP 2007-21858 A

As described above, the structure in which the ink supply device and the water supply device are separated from the plate cylinder is large and complicated because each of these devices has a large number of rollers. This greatly affects the configuration of the system and causes various inconveniences regarding installation and cost.
The present invention has been made in view of the above circumstances, and can suppress an increase in size and complexity of the structure of the printing press as a whole, and can separate the plate cylinder and the ink supply device or return them to their original circumscribed state. It is an object of the present invention to provide an offset printing machine that can easily and quickly perform such operations.

In order to achieve the above object, the present invention has taken the following measures.
In other words, the offset printing press 1 according to the present invention is provided with the impression cylinder 5 and the rubber cylinder 6 in a circumscribed arrangement for sandwiching the supply line of the substrate W, and the plate cylinder 7 is circumscribed with the rubber cylinder 6 so that the ink supply device is provided. 10 is a roller that is externally attached to the plate cylinder 7. The plate cylinder 7 is brought into contact with and separated from the plate roller 7, and the rubber cylinder 6 is brought into contact with and separated from the plate cylinder 7. A contact / separation mechanism 15 that contacts and separates the impression cylinder 5 is provided.
In this manner, the plate cylinder 7, the rubber cylinder 6, and the impression cylinder 5 are moved toward and away from each other by the contact / separation mechanism 15 as necessary. In this case, the ink supply device 10 does not need to be moved. Therefore, the increase in size and complexity of the structure can be suppressed.

  An impression cylinder bearing case 50 that rotatably holds the rotating shaft 5 a of the impression cylinder 5 with respect to the machine frame 22, a rubber cylinder bearing case 45 that rotatably holds the rotating shaft 6 a of the rubber cylinder 6, and the plate cylinder 7 A plate cylinder bearing case 21 that rotatably holds the rotating shaft 7a is rotatably held, and the rotating shaft 5a of the impression cylinder 5 is rubber with respect to the rotation axis P6 of the impression cylinder bearing case 50. The rotation shaft 6a of the rubber cylinder 6 is eccentric with respect to the rotation axis P4 of the cylinder bearing case 45, and the rotation shaft 7a of the plate cylinder 7 is eccentric with respect to the rotation axis P2 of the plate cylinder bearing case 21, respectively. The contact / separation mechanism 15 includes an impression cylinder contact / separation means 18 that rotates the impression cylinder bearing case 50, a rubber cylinder contact / separation means 17 that rotates the rubber cylinder bearing case 45 by the rotation of the impression cylinder bearing case 50, and rubber. Plate cylinder that rotates the plate cylinder bearing case 21 by the rotation of the cylinder bearing case 45 It may be assumed that the release means 16 is provided.

If such a configuration is adopted, the structure can be made more compact and simplified, which is preferable.
In the contact / separation mechanism 15, when the impression cylinder contact case 50 is rotated by the impression cylinder contact / separation means 18, the rubber cylinder contact / separation means 17 causes the rubber cylinder bearing case 45, and the plate cylinder contact / separation means 16 indicates the plate cylinder. Since the bearing cases 21 are respectively rotated, as a result, the contact / separation operation of the impression cylinder 5, the rubber cylinder 6 and the plate cylinder 7 can be performed all at once by only one drive. Therefore, not only simplification of the structure but also ease of operation and speed can be achieved.

  The impression cylinder contacting / separating means 18 includes a rotation driving device 56 and an impression cylinder gear 53 provided in the impression cylinder bearing case 50 to which power from the rotation driving device 56 is transmitted. That's fine. The rubber cylinder contacting / separating means 17 has an interlocking gear 52 provided in the impression cylinder bearing case 50 and a rubber cylinder gear 48 provided in the rubber cylinder bearing case 45 and meshing with the interlocking gear 52. What should I do? The plate cylinder contacting / separating means 16 interlocks and connects the rubber cylinder bracket 47 provided to the rubber cylinder bearing case 45, the plate cylinder bracket 41 provided to the plate cylinder bearing case 21, and the brackets 41 and 47. The connecting rod 42 may be provided.

  If such a configuration is adopted, the structure can be made more compact and simplified, which is preferable.

  In the offset printing press according to the present invention, it is possible to suppress an increase in size and complexity of the structure of the entire printing press. Further, the operation of separating the plate cylinder and the ink supply device or returning to the original circumscribed state can be performed easily and quickly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 8 show an embodiment of an offset printing machine 1 according to the present invention. This offset printing press 1 is called a so-called small intermittent offset printing press that is capable of not only moving forward but also stopping and backing when the substrate W is supplied. For example, as shown in FIG. As described above, a plurality of units are installed along the supply line of the substrate W and different colors are assigned to configure a multicolor printing process, or only one unit is installed to configure a single color printing process.

As shown in FIG. 3, the offset printing machine 1 is provided with an impression cylinder 5 and a rubber cylinder 6 in a circumscribed arrangement that sandwiches a supply line of the substrate W, and a plate cylinder 7 is circumscribed by the rubber cylinder 6. . An ink supply device 10 and a water supply device 11 are provided around the plate cylinder 7.
The impression cylinder 5, the rubber cylinder 6 and the plate cylinder 7 have their rotation shafts 5a, 6a and 7a parallel to each other, the impression cylinder 5 and the rubber cylinder 6 are in a reverse rotation relationship with each other, and the rubber cylinder 6 and the plate cylinder 7 Are rotated in conjunction with each other so that they are in a reverse rotation relationship with each other.
On the outer peripheral surface of the plate cylinder 7, a plate having an image line portion (a portion to be a printing surface) and a non-image line portion (portion on which ink is not placed) formed between the image line portions is provided. A blanket made of leather, rubber or the like is provided on the outer peripheral surface.

The ink supply device 10 has a plurality of (four in the illustrated example) rotating rollers 12 that rotate while circumscribing the plate cylinder 7, and the water supply device 11 rotates while circumscribing the plate cylinder 7. A water roller 13 is provided. An intermediate roller 14 is provided in a circumscribed state so as to straddle one of the form rollers 12 in the ink supply device 10 and the water roller 13 of the water supply device 11. Water is also supplied from the water roller 13 to the landing roller 12 through the water roller 13.
The intermediate roller 14 can adjust the distance between the shafts of the water roller 13 and the dosing roller 12 by a driving tool (not shown) such as a fluid pressure cylinder. Pressure) and on / off switching of water supply.

The offset printing press 1 according to the present invention contacts and separates the plate cylinder 7 with respect to the form roller 12, contacts and separates the rubber cylinder 6 with respect to the plate cylinder 7, and contacts and separates the impression cylinder 5 with respect to the rubber cylinder 6. An approach / separation mechanism 15 is provided. The contact / separation mechanism 15 includes a plate cylinder contact / separation means 16, a rubber cylinder contact / separation means 17, and an impression cylinder contact / separation means 18.
As shown in FIGS. 5 and 6, the rotating shaft 7 a of the plate cylinder 7 protrudes at both ends of the plate cylinder 7 and is rotatably held by the plate cylinder bearing case 21 via the bearings 20. Further, the plate cylinder bearing cases 21 on both sides are rotatably fitted to a case housing 23 provided in the machine frame 22.

The plate cylinder bearing case 21 is formed in a double case structure in which the inner case 27 is rotatably and axially movable in the outer case 26, and the outer surface of the outer case 26 is the case housing 23. The inner peripheral surface of the inner case 27 and the inner peripheral surface of the inner case 27 are in sliding contact with the outer peripheral surface of the bearing 20, respectively.
In the present embodiment, the case housing 23 is fixed to the machine frame 22 via the fixing ring 28, but may be provided integrally with the machine frame 22.

The plate cylinder bearing case 21 (outer case 26) is held with respect to the rotation axis P1 where the rotation shaft 7a of the plate cylinder 7 is held with respect to the plate cylinder bearing case 21 (inner case 27) and the case housing 23. The rotational axis P2 is in an eccentric relationship with each other.
In addition, an axial movement adjusting bolt 30 is connected to one plate cylinder bearing case 21 (the side of FIG. 5 showing the front portion) with respect to the inner case 27 in a relatively rotatable state. Are penetrated by screwing into the female thread portion 32 of the adjustment receiving base 31 fixed to the machine frame 22. The axis of the shaft movement adjusting bolt 30 is concentric with the rotational axis P2 of the plate cylinder bearing case 21 (outer case 26).

A lock nut 33 is screwed onto the shaft movement adjusting bolt 30 and an adjustment dial 34 is fixed to the protruding end of the bolt. By rotating the adjustment dial 34 with the lock nut 33 loosened, The adjustment receiving base 31 is screwed forward / backward, so that the axial movement of the plate cylinder 7 with the inner case 27, that is, the lateral register adjustment of the plate cylinder 7 at the time of printing is enabled.
A driven gear 37 for rotating the plate cylinder 7 is attached to a rotating shaft 7a (on the side of FIG. 6 showing the back surface portion) protruding on one side of the plate cylinder 7 so as to be integrally rotatable.

The plate cylinder bearing case 21 is provided with a flange portion 40 that protrudes radially outward from the outer case 26 at the end on the outer side of the machine frame 22. Is attached with a plate cylinder bracket 41 protruding radially outward at a predetermined angle. As shown in FIG. 4, one end 42 a of a connecting rod 42 is connected to the plate cylinder bracket 41.
As shown in FIGS. 9 and 10, the rotating shaft 6 a of the rubber cylinder 6 protrudes at both ends of the rubber cylinder 6 and is rotatably held by a rubber cylinder bearing case 45 via bearings 43. In addition, the rubber cylinder bearing cases 45 on both sides are rotatably fitted to the case housing 44 provided on the machine frame 22.

The rotation axis P3 where the rotation shaft 6a of the rubber cylinder 6 is held with respect to the rubber cylinder bearing case 45 and the rotation axis P4 where the rubber cylinder bearing case 45 is held with respect to the case housing 44 are eccentric to each other. It is related.
The rubber cylinder bearing case 45 is provided with a flange portion 46 projecting radially outward at an end on the outer side of the machine frame 22, and the outer peripheral portion of the flange portion 46 is radially oriented at a predetermined angle. A rubber barrel bracket 47 protruding outward is attached.
As shown in FIG. 4, the other end 42 b of the connecting rod 42 is connected to the rubber barrel 47. In addition, an arc-shaped rubber drum gear 48 is provided on one flange portion 46 (the side of FIG. 9 showing the front portion) on an outer peripheral portion different from the rubber drum bracket 47.

A driven gear 49 for rotating the rubber cylinder 6 is attached to a rotating shaft 6a (on the side of FIG. 10 showing the back portion) protruding on one side of the rubber cylinder 6 so as to be integrally rotatable.
As shown in FIGS. 11 and 12, the rotating shaft 5 a of the impression cylinder 5 protrudes at both ends of the impression cylinder 5 and is rotatably held by the impression cylinder bearing case 50 via bearings 57. Further, the impression cylinder bearing cases 50 on both sides are rotatably fitted to and held by a case housing 58 provided in the machine frame 22.
The rotation axis P5 where the rotary shaft 5a of the impression cylinder 5 is held with respect to the impression cylinder bearing case 50 and the rotation axis P6 where the impression cylinder bearing case 50 is held with respect to the case housing 58 are eccentric from each other. It is related.

The impression cylinder bearing case 50 is provided with a flange portion 51 projecting radially outward at an end portion on the outer side of the machine frame 22. As shown in FIG. 4, an arcuate interlocking gear 52 is provided at one flange portion 51 (the front portion in FIG. 11 side) at a position where it engages with the rubber barrel gear 48 on the rubber barrel 6 side. In addition, an arc-shaped impression cylinder gear 53 is provided on an outer peripheral portion different from the interlocking gear 52.
A driven gear 59 for receiving the rotational drive of the pressure drum 6 is attached to a rotary shaft 5a (on the side of FIG. 12 showing the back surface portion) protruding on one side of the pressure drum 5 so as to be integrally rotatable.

As shown in FIG. 13, a driven gear 37 provided on the plate cylinder 7 and a driven gear 49 provided on the rubber cylinder 6 mesh with each other, and the driven gear 49 and a driven gear 59 provided on the impression cylinder 5 are engaged with each other. And the driven gear 59 meshes with a driving gear 84 attached to the driving motor 38 via an intermediate gear 83. Therefore, the plate cylinder 7, the rubber cylinder 6, and the impression cylinder 5 are rotated in conjunction with each other by being driven by the driving motor 38.
As apparent from a comparison between FIG. 4 and FIG. 1, the plate cylinder contact / separation means 16 of the contact / separation mechanism 15 is for rotating the plate cylinder bearing case 21 by the rotation of the rubber cylinder bearing case 45. In this embodiment, the plate cylinder bracket 41 provided in the plate cylinder bearing case 21 and the rubber cylinder bracket 47 provided in the rubber cylinder bearing case 45 are connected by the connecting rod 42.

The rubber cylinder contact / separation means 17 of the contact / separation mechanism 15 is for rotating the rubber cylinder bearing case 45 by the rotation of the impression cylinder bearing case 50. In the present embodiment, the rubber cylinder contact / separation means 17 is provided in the rubber cylinder bearing case 45. The rubber cylinder gear 48 and the interlocking gear 52 provided in the impression cylinder bearing case 50 are engaged with each other.
The impression cylinder contact / separation means 18 of the contact / separation mechanism 15 is for rotating the impression cylinder bearing case 50. In this embodiment, the impression cylinder contact / separation means 18 is an intermediate gear with respect to the impression cylinder gear 53 provided in the impression cylinder bearing case 50. The driving gear 55 is engaged with each other through the gear 54, and the driving gear 55 is configured to be able to rotate forward and reverse at a predetermined angle by a rotation driving device 56 such as an air actuator.

That is, when the rotation drive device 56 is rotated forward or backward by a predetermined angle in the contact / separation mechanism 15, the driving force is transmitted from the driving gear 55 to the impression cylinder gear 53 via the intermediate gear 54, and the pressure of the impression cylinder 5 is increased. The body bearing case 50 rotates by a predetermined angle. Then, driving is transmitted from the interlocking gear 52 to the rubber cylinder gear 48, and the rubber cylinder bearing case 45 of the rubber cylinder 6 rotates by a predetermined angle.
In the impression cylinder bearing case 50 of the impression cylinder 5 and the rubber cylinder bearing case 45 of the rubber cylinder 6, the rotational directions are relatively opposite. Upon receiving the rotation of the rubber cylinder bearing case 45 of the rubber cylinder 6, the connecting rod 42 is pushed and pulled, whereby the plate cylinder bearing case 21 of the plate cylinder 7 is rotated by a predetermined angle. The rotation direction of the rubber cylinder bearing case 45 of the rubber cylinder 6 and the plate cylinder bearing case 21 of the plate cylinder 7 are the same.

  The rotation axis P5 of the impression cylinder 5 and the rotation axis P6 of the impression cylinder bearing case 50 are eccentric, the rotation axis P3 of the rubber cylinder 6 and the rotation axis P4 of the rubber cylinder bearing case 45 are eccentric, and the plate cylinder. 7 is eccentric and the rotational axis P2 of the plate cylinder bearing case 21 is eccentric, so that the impression cylinder bearing case 50, the rubber cylinder bearing case 45, and the plate cylinder bearing case 21 are interlocked as described above. When rotating at a predetermined angle, the impression cylinder 5 is moved around the rotation axis P6, the rubber cylinder 6 is moved around the rotation axis P4, and the plate cylinder 7 is moved around the rotation axis P2. The position moves around.

FIG. 4 shows the state before the contact / separation mechanism 15 is activated (before the rotation drive device 56 is rotated), and the impression cylinder 5 and the rubber cylinder 6 can sandwich the substrate W, and the plate cylinder 7 is attached to the rubber cylinder 6. At the same time, the plate cylinder 7 is also circumscribed on the form roller 12 (see FIG. 3) of the ink supply device 10, and printing is possible. That is, the impression cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are all arranged at the printing position.
On the other hand, FIG. 1 shows the state after the operation of the contact / separation mechanism 15 (after the rotation of the rotation driving device 56), the impression cylinder 5 and the rubber cylinder 6 are separated from each other, and the plate cylinder 7 is the rubber cylinder. 6 and the form roller 12 are separated from each other at the same time, and idle rotation of each cylinder is possible (non-printing state). That is, the impression cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are all arranged at the idle position.

As shown in FIG. 3, the water supply device 11 includes a water tray 60, a first water supply source roller 61 that is rotatably held in a state where the lower peripheral surface is sunk in the water tray 60, and the first water supply device 11. A second water supply roller 62 that is rotatably held with a predetermined distance from the supply roller 61 and with the rotation axis parallel to each other, and the first and second water supply rollers 61 and 62 are simultaneously circumscribed. The squeezing roller 63 is rotatably held in such a state that the water roller 13 described above is provided in a state of circumscribing the second water supply source roller 62 and the plate cylinder 7 simultaneously.
The first and second water supply rollers 61 and 62 are metal rollers, and the squeezing roller 63 and the water roller 13 are rubber rollers.

The water roller 13 and the second water supply source roller 62 are driven to rotate by obtaining power from the plate cylinder 7 side when the water roller 13 is circumscribed by the plate cylinder 7.
On the other hand, the squeezing roller 63 and the first water supply source roller 61 are driven to rotate by obtaining power from a drive motor (not shown) provided in the first water supply source roller 61. The rotational speed of the drive motor provided on the first water supply source roller 61 can be adjusted manually.
Further, the water supply device 11 moves the water roller 13 around the second water supply source roller 62 so that the circumscribed state is maintained even when the plate cylinder 7 moves to the printing position and the idling position. Follower 65 is provided.

As shown in FIG. 7, the follower 65 holds the water roller 13 by a support arm 66 that is swingably provided with the rotation axis of the second water supply source roller 62 as a fulcrum. The elastic member 67 is connected to the support arm 66 so as to move concentrically around the second water supply source roller 62 and to generate a spring force in the direction of pressing the water roller 13 against the plate cylinder 7. It has a structure.
In the present embodiment, a coil spring is used as the compression spring as the elastic member 67, but a ring spring may be attached around the rotation axis of the second water supply source roller 62. Also, with other structures, it is possible to generate a spring force that presses the water roller 13 against the plate cylinder 7, and in some cases, it is possible to adopt a structure that does not involve a spring force.

In this embodiment, a positive cam 68 that contacts the support arm 66 is provided, and the positive cam 68 is rotated by a fluid pressure drive type or electric rotary actuator 69 as necessary. 70 is provided.
For example, by operating the forced water stop device 70 at the time of cleaning or maintenance, the positive cam 68 swings the support arm 66 so as to push it away in the direction against the spring force of the spring 67, and the water roller 13 is forcibly separated from the plate cylinder 7.
The squeezing roller 63 forms a water amount adjusting device 73 for adjusting the amount of water supplied from the first water supply source roller 61 to the second water supply source roller 62 as shown in FIG.

  In addition to the squeezing roller 63, the water amount adjusting device 73 includes an operating shaft 77 provided with an adjusting handle 75 at one end and a worm gear 76 provided at the other end so that they can rotate integrally, and the operating shaft 77. A pinion gear 78 meshed with the worm gear 76, a first slip wheel 79 eccentrically provided on the rotation shaft 78 a with respect to the pinion gear 78, and a swingable connection around the first slip wheel 79. The swinging arm 80 has a second slip ring 81 rotatably held at the tip of the swinging arm 80, and the rotation shaft 63 a of the squeezing roller 63 is eccentric to the second slip ring 81. Is held in a state to

Therefore, when the adjustment handle 75 is rotated, the pinion gear 78 is rotated via the worm gear 76, and the first slip ring 79 is caused to move circumferentially in accordance with the eccentric amount.
As a result, a swing driving component is given to the swing arm 80, and the first slip ring 79 is moved along with the squeezing roller 63 circumscribing the first and second water supply rollers 61 and 62. Slip is generated between the outer peripheral surface and the outer peripheral surface of the second slip ring 81, respectively, with the swing arm 80. As a result, the squeezing roller 63 is provided with the first and second water supply source rollers 61 and 62. The distance between the shafts (external pressure) is adjusted, and the amount of water transmitted from the first water supply roller 61 to the second water supply roller 62 is thereby adjusted.

Next, the movement of the offset printing machine 1 will be described.
As shown in FIG. 4, while supplying the printing material W between the impression cylinder 5 and the rubber cylinder 6, the ink is applied from the form roller 12 of the ink supply device 10 to the plate cylinder 7 circumscribing the rubber cylinder 6. Then, water is supplied from each of the water rollers 13 of the water supply device 11 to print the substrate W.
At the time of non-printing such as during maintenance or break, first, the ink supply by the ink supply device 10 is stopped, and then the rotation drive device 56 of the contact / separation mechanism 15 is counterclockwise by a predetermined angle as shown in FIG. Rotate. Then, driving force is transmitted from the driving gear 55 to the impression cylinder gear 53 via the intermediate gear 54, and the impression cylinder bearing case 50 rotates counterclockwise by a predetermined angle.

Further, the drive is transmitted from the interlocking gear 52 to the rubber cylinder gear 48, the rubber cylinder bearing case 45 rotates clockwise by a predetermined angle, and the connecting rod 42 is pulled downward by receiving the rotation of the rubber cylinder bearing case 45. Accordingly, the plate cylinder bearing case 21 also rotates clockwise by a predetermined angle.
Accordingly, as the impression cylinder bearing case 50, the rubber cylinder bearing case 45, and the plate cylinder bearing case 21 rotate, the impression cylinder 5 moves to the position around the rotation axis P6 (about 2 mm on the outer peripheral surface), and the rubber. The cylinder 6 moves about the rotation axis P4 (about 1.5 mm on the outer peripheral surface), and the plate cylinder 7 moves about the rotation axis P2 (about 1 mm on the outer peripheral surface).

That is, the impression cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are all in a state of being separated from each other and not circumscribed. However, the driven gears 59, 49, and 37 (see FIG. 13) provided on the rotary shafts 5a, 6a, and 7a of the pressure cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are in an accurate circumscribed state between the pitch circles. Is slightly disengaged, but the meshing state between the gear teeth is not released, so the interlocking rotation state is maintained.
At this time, in the water supply apparatus 11, as shown in FIG. 7, the follower 65 moves the water roller 13 around the second water supply source roller 62 to maintain the circumscribed state to the plate cylinder 7. . Therefore, the plate cylinder 7 can always maintain an appropriate wet state even during the non-printing.

In this manner, the plate cylinder 7 is simultaneously separated from the rubber cylinder 6 and the form roller 12 of the ink supply device 10, but is in an idle position that maintains a circumscribed state with the water roller 13 of the water supply device 11.
Here, the driving motor 38 is controlled, and the plate cylinder 7 is idle-rotated at a lower speed than the rotation speed at the time of printing. In this case, since the rotation of the water roller 13 circumscribing the plate cylinder 7 is also reduced, the amount of water supplied from the water roller 13 to the plate cylinder 7 is suppressed to the minimum necessary.
If necessary, the adjustment handle 75 of the water amount adjusting device 73 (see FIG. 8) is operated to set the interaxial distance (external pressure) between the squeeze roller 63 and the first and second water supply source rollers 61 and 62. The first water supply source roller 61 is changed to the second water supply source roller 62 by adjusting the speed or by controlling the speed of the drive motor (not shown) that drives the first water supply source roller 61 to rotate. You may adjust the amount of water transmitted.

When changing from the non-printing state to the printing state, the rotation driving device 56 of the contact / separation mechanism 15 is rotated in the clockwise direction (the reverse rotation direction to the above), so that the impression cylinder 5, the rubber cylinder 6, and the plate are rotated. The cylinder 7 is returned to the mutually circumscribed state, and at the same time, the plate cylinder 7 is brought into the circumscribed state with the form roller 12 of the ink supply device 10, and the ink supply by the ink supply device 10 is resumed, and the impression cylinder 5, the rubber cylinder 6, and the plate The condition is adjusted by letting the barrel 7 idle for a while at a speed higher than the idle rotation.
Thereafter, the printing material W may be supplied between the impression cylinder 5 and the rubber cylinder 6 to start printing. Since the plate cylinder 7 is kept in an appropriate wet state during non-printing (during idling), the ink adhering to the plate cylinder 7 is not dried, and printing can be resumed easily and quickly.

  By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.

It is the side view which showed the positional relationship of the plate cylinder, the rubber cylinder, and the impression cylinder at the time of non-printing (during idling). It is the perspective view which showed the example of the installation about one Embodiment of the offset printing machine which concerns on this invention. It is the perspective view which showed the internal structure in the offset printing machine of FIG. It is the side view which showed the positional relationship of the plate cylinder, the rubber cylinder, and the impression cylinder at the time of printing. FIG. 5 is a cross-sectional plan view showing the axial direction near one end corresponding to the line AA in FIG. 4. FIG. 5 is a plan sectional view showing the vicinity of the other end in the axial direction corresponding to the line AA in FIG. 4. It is a side view corresponding to the B section of FIG. It is a side view corresponding to the C section of FIG. FIG. 5 is a plan sectional view showing the axial direction near one end corresponding to the line DD in FIG. 4. FIG. 5 is a cross-sectional plan view showing the axial direction other end side corresponding to the DD line of FIG. 4. It is the plane sectional view showing the axial direction near one end corresponding to the EE line of FIG. It is the plane sectional view showing the axial direction other end side corresponding to the EE line of FIG. It is the side view shown from the direction used as the back side of the state shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Offset printing machine 5 Pressure cylinder 6 Rubber cylinder 7 Plate cylinder 7a Rotating shaft 10 Ink supply apparatus 11 Water supply apparatus 12 Forming roller 13 Water roller 15 Contact / separation mechanism 16 Plate cylinder contact / separation means 17 Rubber cylinder contact / separation means 18 Pressure cylinder contact / separation Means 21 Bearing case 22 Machine frame 23 Case housing 62 Water supply source roller 65 Following means W Printed material

Claims (3)

An impression cylinder (5) and a rubber cylinder (6) are provided in a circumscribed arrangement sandwiching the supply line of the substrate (W), a plate cylinder (7) is circumscribed on the rubber cylinder (6), and an ink supply device (10 In an offset printing machine in which the form roller (12) is circumscribed on the plate cylinder (7),
The plate cylinder (7) is moved toward and away from the application roller (12), the rubber cylinder (6) is moved toward and away from the plate cylinder (7), and the impression cylinder (5) is moved toward and away from the rubber cylinder (6). An offset printing machine provided with a contact / separation mechanism (15). An impression cylinder bearing case (50) for rotatably holding the rotating shaft (5a) of the impression cylinder (5) and a rotating shaft (6a) of the rubber cylinder (6) are rotatably held with respect to the machine frame (22). A rubber cylinder bearing case (45) and a plate cylinder bearing case (21) for rotatably holding the rotating shaft (7a) of the plate cylinder (7), respectively, are rotatably held;
The rotary shaft (5a) of the impression cylinder (5) is against the rotational axis (P6) of the impression cylinder bearing case (50), and the rubber cylinder is against the rotational axis (P4) of the rubber cylinder bearing case (45). The rotational axis (6a) of (6) is eccentric to the rotational axis (7a) of the plate cylinder (7) with respect to the rotational axis (P2) of the plate cylinder bearing case (21),
The contact / separation mechanism (15) rotates an impression cylinder contacting / separating means (18) for rotating the impression cylinder bearing case (50) and a rubber cylinder bearing case (45) by rotation of the impression cylinder bearing case (50). A rubber cylinder contact / separation means (17) that moves, and a plate cylinder contact / separation means (16) that rotates the plate cylinder bearing case (21) by the rotation of the rubber cylinder bearing case (45) are provided. The offset printing machine according to claim 1, wherein The impression cylinder contacting / separating means (18) is provided in a rotation driving device (56) and an impression cylinder bearing case (50), and an impression cylinder gear to which power from the rotation driving device (56) is transmitted. (53)
The rubber cylinder contacting / separating means (17) is engaged with the interlocking gear (52) provided in the impression cylinder bearing case (50) and the interlocking gear (52) provided in the rubber cylinder bearing case (45). A rubber barrel gear (48),
The plate cylinder contacting / separating means (16) includes a rubber cylinder bracket (47) provided in the rubber cylinder bearing case (45), a plate cylinder bracket (41) provided in the plate cylinder bearing case (21), The offset printing machine according to claim 2, further comprising a connecting rod (42) for interlockingly connecting both brackets (41, 47).

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