JP2003136672A - Apparatus for attaching/detaching cylinder of offset perfecting press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly position each cylinder with regard to an apparatus for attaching/detaching the cylinder of an offset perfecting press. SOLUTION: The shaft center position of each plate cylinder 8 and 18 is fixed and arranged, and each blanket cylinder 1 and 11 is attached/detached to/from a corresponding plate cylinder and a counter blanket cylinder by attaching/detaching means 2, 22, 23, 21, 3, 32, 33, and 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mounting and demounting a cylinder of an offset double-sided printing machine, and is particularly suitable for use in a shaftless type printing machine provided with independently operable drive motors on the left and right sides of each printing unit. To the body attachment / detachment device.

[0002]

2. Description of the Related Art FIG. 8 is a front view showing the construction of a printing section of a conventional newspaper offset double-sided printing machine. The printing unit 50 of the offset double-sided printing press for newspapers is composed of a plurality of printing units 51A to 51D arranged side by side in the vertical direction. A pair of blanket cylinders 61 and 71 are arranged to face each of the printing units 51A to 51D, and plate cylinders 67 and 77 are attached to the blanket cylinders 61 and 71, respectively. The belt-shaped web 20 which is a printing paper is used for the printing unit 50.
Running in the vertical direction, each blanket cylinder 61,
71 are sequentially passed.

At the time of printing, the blanket cylinder 61 and the plate cylinder 6
7, the blanket cylinder 71 and the plate cylinder 77 come into contact with each other, and the blanket cylinder 61 and the blanket cylinder 71 facing each other also come into contact with each other with the web 20 interposed therebetween. In this state, the ink is supplied to the plate cylinders 67 and 77, so that the ink adheres to the printing plate wound around the plate cylinders 67 and 77,
The ink attached to the printing plate is transferred and attached to the blanket cylinders 61 and 71, and the ink attached to the blanket cylinders 61 and 71 is printed on the web 20 at the nip portion between the blanket cylinders 61 and 71.

On the other hand, the cylinders 61, 71, 67, 77 are separated from each other when preparing for ink replacement or plate replacement. From the state where the respective cylinders 61, 71, 67, 77 are in contact with each other like during printing, the respective cylinders 61, 71, 67, 77 are thus
The operation to separate the body is called the body removal, and conversely, each body 61, 7
From the state that 1, 67, 77 are separated from each other,
The operation of bringing 7,77 into contact with each other is called body insertion.

FIG. 9 is a front view showing the construction of a printing unit in a conventional offset double-sided printing press for newspapers, and shows in detail a conventional device for removing the cylinder (body removing device). As shown in FIG. 9, one blanket cylinder (left blanket cylinder) 61 has its rotating shaft 64 supported by an eccentric bearing (inner eccentric bearing) 62, and this eccentric bearing 62 is further separated from another eccentric bearing (outer eccentric bearing). Eccentric bearing)
It has a double eccentric structure supported by 63. The other blanket cylinder (right blanket cylinder) 71
Has an eccentric structure in which its rotating shaft 74 is supported by an eccentric bearing 72.

Inner eccentric bearing 62 of the left blanket cylinder 61
The eccentric bearing 72 of the right blanket cylinder 71 is rotatably operated by the same operating device. This operating device uses a link mechanism. The air cylinder 81 is connected to a link member 82 which is rotatable around a fixing pin 83 whose position is fixed to the machine frame, and the eccentricity with the link member 82 is provided. The bearings 62 and 72 are connected to each other. The end of the air cylinder 81 on the main body side is rotatably supported by a fixing pin 84, and the end of the telescopic rod 81a is pin 85.
Is rotatably connected to the link member 82.
A lever 62 a is provided on the inner eccentric bearing 62 of the left blanket cylinder 61, and the lever 62 a and the link member 82 are connected by a rod 86. The lever 62a and the rod 86, and the link member 82 and the rod 86 are rotatably connected by pins 87 and 88, respectively. Similarly, the eccentric bearing 72 of the right blanket cylinder 71 is provided with a lever 72 a, and the lever 72 a and the link member 82 are connected by a rod 89. The lever 72a and the rod 89, and the link member 82 and the rod 89 are rotatably connected by pins 90 and 91, respectively.

With such a structure, as shown in FIGS.
As shown in (a), the telescopic rod 81a of the air cylinder 81 in the state where the respective cylinders 61, 71, 67, 77 are in contact with each other.
When the contraction operation is performed, the link member 82 rotates counterclockwise in the figure around the fixing pin 83. This link member 8
By the rotation of 2, the rods 86, 89 are pulled, and the inner eccentric bearing 62 of the left blanket cylinder 61 and the eccentric bearing 72 of the right blanket cylinder 71 respectively rotate clockwise in the drawing. The rotation of the eccentric bearings 62 and 72 causes the rotary shafts 64 and 74 of the blanket cylinders 61 and 71 to be displaced, and as shown in FIG.
1 moves, between the blanket cylinder 61 and the plate cylinder 67,
Between the blanket cylinder 71 and the plate cylinder 77 and between the blanket cylinders 61 and 71, gaps W12, W13,
W11 is formed and the cylinders 61, 71, 67, 77 are removed. In addition, by reversely expanding the telescopic rod 81a of the air cylinder 81 from this state (the state shown in FIG. 11A), as shown in FIG. 11B, the respective trunks 61, 71, 67, 77 are moved. Body insertion is performed.

Further, the conventional cylinder attaching / detaching device is also provided with a mechanism for adjusting the printing pressure (nip pressure) between the cylinders. First, the left blanket cylinder 61 has an outer eccentric bearing 6
A rod 92 is rotatably connected to a lever 63a provided on the shaft 3 via a pin 94. This rod 92
The other end is rotatably connected to the fixing pin 93, and a turnbuckle 92a is provided in the center.
Further, the left plate cylinder 67 and the right plate cylinder 77 are provided with the respective rotary shafts 69, 7
9 are supported by eccentric bearings 68 and 78, respectively. The eccentric bearings 68, 78 are provided with levers 68a, 78a, and rods 98, 95 are rotatably connected to the levers 68a, 78a via pins 100, 97, respectively. The other ends of the rods 98 and 95 are rotatably connected to the fixing pins 99 and 96, respectively.
Turnbuckles 98a and 95a are provided in the central portion.

With such a configuration, the turnbuckle 9
By operating 2a, the length of the rod 92 is adjusted and the rotation amount of the outer eccentric bearing 63 is adjusted. As a result, the rotary shaft 64 of the left blanket cylinder 61 is slightly displaced around the axis of the outer eccentric bearing 63, and the left blanket cylinder 61 is slightly moved to move the right blanket cylinder 71 and the left blanket cylinder as shown in FIG. 11C. The printing pressure of the nip portion N11 with 61 is adjusted. Further, the length of the rod 95 is adjusted by operating the turnbuckle 95a, and the eccentric bearing 7 of the right plate cylinder 77 is adjusted.
The rotation amount of 8 is adjusted, and the right plate cylinder 77 is slightly moved as shown in FIG.
The printing pressure of the nip portion N13 with respect to 7 is adjusted. Further, by operating the turnbuckle 98a, the length of the rod 98 is adjusted, the rotation amount of the eccentric bearing 68 of the left plate cylinder 67 is adjusted, and the left plate cylinder 67 is slightly moved as shown in FIG. 11 (d). N1 between the left blanket cylinder 61 and the left plate cylinder 67
The printing pressure of 2 is adjusted.

[0010]

As described above, the conventional cylinder attaching / detaching device moves the left blanket cylinder 61 and the right blanket cylinder 71 simultaneously by using the eccentric bearings 62, 72 and the link mechanism. A mechanism for adjusting the printing pressure of each of the nip portions N11, N12, and N13 with the right blanket cylinder 71 as a reference while performing the insertion / extraction operation of the cylinder.

However, the eccentric bearing 72 that supports the rotary shaft 74 of the right blanket cylinder 71 is difficult to achieve accuracy in machining and assembly, and the right blanket cylinder 71 may be the standard of the machine depending on the machining accuracy and the assembly accuracy of the eccentric bearing 72. It is difficult to place it exactly parallel to the axis. For this reason,
Each nip portion N11 based on the right blanket cylinder 71,
When trying to adjust the printing pressures of N12 and N13, the other cylinder 6 which will be positioned with respect to the right blanket cylinder 71
There is a possibility that the twists will occur in 1, 67, and 77, and as a result, the registration of the pattern printed on the web 20 will be misregistered.

When some of the printing units 51A to 51D are not used for printing, the cylinders of the printing units are removed. In the conventional cylinder attachment / detachment device, in order to obtain a stable printing state, the left blanket cylinder 61 and the right blanket cylinder 71 are arranged with a slight offset in the vertical direction, and the web 20 is arranged on each blanket cylinder 6
I am trying to wind it around 1,71. When removing the body,
Since the left blanket cylinder 61 and the right blanket cylinder 71 are separated from each other, the wrapping amount of the web 20 is reduced as shown in FIG. 10B, but it is preferable that the blanket cylinders 61 and 71 separate from the web 20 at the time of removing the cylinder. I want to do it.

Today, each printing unit 51A-51D
A shaftless printing machine that can independently drive each drive system has been put into practical use. Therefore, if the blanket cylinders 61, 71 can be separated from the web 20 when the cylinders are removed, the rotation of the cylinders 61, 71, 67, 77 can be stopped for a printing unit that does not perform printing, which results in wasteful energy consumption. And driving noise can be suppressed. In a conventional shaft-type printing press that extracts driving force from a drive shaft, the blanket cylinders on the left and right are linked by gears so that they can be driven integrally, so there is a limit to the amount of blanking between blanket cylinders. However, since the shaftless printer has a drive motor for driving the blanket cylinder 61 on the left side and a drive motor for driving the blanket cylinder 71 on the right side separately, the gap W11 between the left and right blanket cylinders 61, 71 is increased. There is no problem in opening the door wide.

However, in the structure using the eccentric bearings 62 and 72, since the blanket cylinders 61 and 71 move in an arc shape, the left and right blanket cylinders 61 and 71 are attached to and detached from the plate cylinders 67 and 77 without interfering with each other. There is a limit to the design range of the link mechanism for making it. Also, each torso 6
Since devices such as drive gears are arranged in a complicated manner at both ends of 1, 71, 67, 77, there are also large restrictions on the arrangement of the link member 82, the air cylinder 81, and the like. Therefore, in the conventional cylinder attaching / detaching device, each blanket cylinder 61, 7
The amount of movement of 1 (that is, the gap W11) cannot be increased, and as shown in FIG. 10B, the web 20 is wound around the blanket cylinders 61 and 71 even when the cylinder is removed, and the web 20 The blanket cylinders 61 and 71 had to be rotated in synchronization with the running.

The present invention was devised in view of the above problems, and an object of the present invention is to provide a cylinder attaching / detaching device for an offset double-sided printing machine, which enables each cylinder to be accurately positioned. Another object of the present invention is to provide a cylinder attachment / detachment device for an offset double-sided printing machine, which allows the left and right blanket cylinders to be widely separated when the cylinder is removed.

[0016]

SUMMARY OF THE INVENTION A cylinder attaching / detaching device for an offset double-sided printing machine according to the present invention is a type of offset double-sided printing in which a pair of blanket cylinders each including a plate cylinder are arranged to face each other across a web running line. In the machine, the axial center positions of the plate cylinders are fixed, and the blanket cylinders are attached to and detached from the corresponding plate cylinders and the corresponding blanket cylinders by the attaching / detaching means.

With such a structure, at least each plate cylinder can be always parallel to the reference axis of the machine, and when the blanket cylinders are brought into contact with the corresponding plate cylinders, the blanket cylinders are brought into contact with each other. The parallelism of the cylinder with respect to the reference axis of the machine is also improved. Therefore, by positioning the corresponding blanket cylinders on the basis of the respective plate cylinders, the respective cylinders can be accurately positioned, and the misregistration due to the twisting of the cylinders can be prevented.

The attaching / detaching means is preferably a first moving means for moving one blanket cylinder in the first direction and a second moving means for the other blanket cylinder in a second direction different from the first direction. The second moving means for moving the first moving means and the second moving means can be operated independently of each other. By configuring the left and right blanket cylinders to move independently of each other in this way, compared to the conventional configuration that moves the left and right blanket cylinders at the same time, the design range is widened due to less mechanical constraints, and It is possible to avoid the above restrictions. Therefore, the amount of movement of each blanket cylinder when the cylinder is removed can be retracted to a position where each blanket cylinder does not contact the web.

Each of the first moving means and the second moving means preferably comprises an eccentric bearing for supporting the corresponding blanket cylinder and a bearing operating device for rotating the eccentric bearing. Thus, by using the eccentric bearing as the moving means of each blanket cylinder, smooth movement is possible and sufficient strength of the movable portion can be ensured.

In the above-mentioned bearing operating device, the eccentric bearing and the stationary member are connected by a rod arranged in a plane parallel to the rotation surface of the eccentric bearing, and the rod length is adjusted in two stages to this rod. It is preferable that a cylinder (air cylinder, hydraulic cylinder, etc.) and a fine adjustment device for finely adjusting the rod length are provided in series. A turnbuckle can be simply used as the fine adjustment device. With such a configuration, by operating the cylinder, the eccentric bearing can be largely rotated and the blanket cylinder can be largely moved, and the eccentric bearing can be minutely rotated by the fine adjustment device to finely move the blanket cylinder. Therefore, the same eccentric bearing can be used for both large movements such as when removing the cylinder and minute movements during printing pressure adjustment.

The above rod is divided into a first rod connected to the eccentric bearing and a second rod connected to the stationary member, and the first rod and the second rod form a link mechanism. It is preferable that they are connected to each other through a structure. By thus interposing the link mechanism, the stroke amount of the cylinder can be reduced. Further, in addition to the first moving means and the second moving means, a third moving means for moving one blanket cylinder in a third direction different from the first direction and the second direction is provided. Preferably, it is provided. Since the blanket cylinder can be moved in a total of three directions in this manner, it is possible to adjust the printing pressure between the plate cylinder and the blanket cylinder and between the left and right blanket cylinders. More preferably, the third moving direction of the third moving means is a direction orthogonal to the first moving direction.

In this case, more preferably, the one blanket cylinder is supported by a double eccentric bearing, and the inner eccentric bearing operating device for rotating the inner eccentric bearing of the double eccentric bearing and the outer side of the double eccentric bearing. And an outer eccentric bearing operating device for rotating the eccentric bearing. The inner eccentric bearing and the inner eccentric bearing operating device constitute the first moving means, and the outer eccentric bearing and the outer eccentric bearing operating device constitute the third moving means. By using the double eccentric bearing in this way, one blanket cylinder can be moved in two different directions (first direction and third direction) without complicating the structure.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a printing unit of an offset double-sided printing press for newspaper including a cylinder attaching / detaching device according to an embodiment of the present invention. Although not particularly shown here, the printing unit shown in FIG. 1 is a printing unit of a shaftless printing machine, and includes a drive motor for driving each cylinder on the left side and a drive motor for driving each cylinder on the right side. Are separately provided, and no driving force is transmitted by gears between the left side cylinder and the right side cylinder.

As shown in FIG. 1, the printing unit of the offset double-sided printing press for newspapers comprises a pair of blanket cylinders 1 and 11 arranged to face each other with a running line of the web 20 interposed therebetween.
And the plate cylinders 8 and 18 corresponding to the blanket cylinders 1 and 11, respectively.
It has and. Blanket cylinders 1 and 11 are web 20
The webs 20 are arranged at positions slightly deviated in the traveling direction (vertical direction in FIG. 1) of each of the blanket cylinders 1, 1.
It is designed to run while being wrapped around the circumference of 1.

Of the cylinders 1, 11, 8 and 18 described above, the left and right plate cylinders 8 and 18 have their rotary shafts 9 and 19 mounted on the body via bearings 6 and 16 which are concentric with the rotary shafts 9 and 19, respectively. It is supported by the frame. Therefore, the positions of the plate cylinders 8 and 18 are always constant regardless of the rotation of the bearings 6 and 16, and the position is adjusted so that the axis line thereof is parallel to the reference axis of the machine body.

On the other hand, the left and right blanket cylinders 1 and 11 are
The rotating shafts 4 and 14 are supported by the machine body frame via eccentric bearings 2, 3 and 12, which will be described later. Here, FIG.
(A) is one blanket cylinder (left blanket cylinder) 1
2B is a side sectional view showing the structure of the bearing portion of FIG. 2, and FIG. 2B is a side sectional view showing the structure of the bearing portion of the other blanket cylinder (right blanket cylinder) 11. Further, FIG. 3 shows the axial center of each blanket cylinder 1, 11 and each eccentric bearing 2, 3, 12
It is a schematic diagram which shows the positional relationship with the rotation center of.

As shown in FIG. 2A, a sleeve 2a is attached to the end of the rotary shaft 4 of the left blanket cylinder 1. The sleeve 2a is an eccentric sleeve in which the center of the outer peripheral surface is displaced from the center of the rotary shaft 4, and together with the bearing 2b attached to the outer peripheral surface, the rotation center C2 of the bearing 2b with respect to the shaft center C1 of the rotary shaft 4 is formed. An eccentric bearing (inner eccentric bearing) 2 that is eccentric is configured. The outer periphery of the inner eccentric bearing 2 is supported by the inner peripheral surface of the sleeve 3a. This sleeve 3a is also an eccentric sleeve in which the center of the inner peripheral surface is deviated from the center of the outer peripheral surface, and together with the bearing 3b attached to the outer peripheral surface, the center of rotation C3 of the bearing 3b with respect to the axis C2 of the inner eccentric bearing 2 is formed. Constitutes an eccentric bearing (outside eccentric bearing) 3. The outer eccentric bearing 3 is attached to the body frame 10, and as a result, the left blanket cylinder 1 is supported by the body frame 10 via a double eccentric bearing including an inner eccentric bearing 2 and an outer eccentric bearing 3.

On the other hand, the rotary shaft 14 of the right blanket cylinder 11
As shown in FIG. 2B, a sleeve 12a is attached to the end of the sleeve. The sleeve 12a is an eccentric sleeve in which the center of the outer peripheral surface is displaced from the center of the rotating shaft 4,
With the bearing 12b mounted on the outer peripheral surface, the rotating shaft 1
The center of rotation C1 by the bearing 12b with respect to the axis C11 of 4
2 constitutes an eccentric bearing 12 which is eccentric. Eccentric bearing 1
2 is attached to the body frame 10, and as a result, the right blanket cylinder 11 is supported by the body frame 10 via one eccentric bearing 12.

As shown in FIG. 3, the center of rotation C2 of the inner eccentric bearing 2 is arranged substantially horizontally to the left with respect to the axis C1 of the rotary shaft 4 of the left blanket cylinder 1, and the outer eccentric bearing 2 has a center of rotation C2. The rotation center C3 is arranged substantially vertically upward. As a result, the rotation direction (first direction) of the shaft center C1 when the rotation shaft 4 is rotated around the rotation center C2 of the inner eccentric bearing 2 and the rotation center C3 of the outer eccentric bearing 3 are centered. The rotation direction (the third direction) of the shaft center C1 when the rotation shaft 4 is rotated is substantially orthogonal.
On the other hand, the rotation center C12 of the eccentric bearing 12 is arranged substantially horizontally to the right with respect to the axis C11 of the rotation shaft 14 of the right blanket cylinder 11, and as a result, the eccentric bearing 12
The rotation direction (second direction) of the shaft center C11 when the rotation shaft 14 is rotated about the rotation center C12 is different from the first direction and the third direction. Has become. By making the blanket cylinders 1 and 11 movable in three different directions in this way, between the left blanket cylinder 1 and the left plate cylinder 8, between the right blanket cylinder 11 and the right plate cylinder 18, Also, the printing pressure of each nip between the left and right blanket cylinders 1 and 11 can be adjusted.

The eccentric bearings 2 and 3 of the left blanket cylinder 1 and the eccentric bearing 12 of the right blanket cylinder 11 are rotated by independent operating devices. The inner eccentric bearing 2 of the left blanket cylinder 1 has a lever 2
c is provided, and the rod 2c is provided with a turnbuckle (fine adjustment device) 22a (first rod)
A link member 23 is connected via 22. The link member 23 is rotatably supported by a fixed pin 24 whose position is fixed with respect to the body frame.
3, the rod 22 and the lever 2c and the rod 22 are rotatably connected by pins 27 and 28, respectively. Further, the air cylinder 21 is connected to the link member 23. The end of the air cylinder 21 on the main body side is rotatably supported by a fixing pin 25 whose position is fixed with respect to the body frame, and the telescopic rod (second rod) 2
The end on the 1a side is rotatably connected to the link member 26 by a pin 26.

In this embodiment, an operating device for rotating the inner eccentric bearing 2 of the left blanket cylinder 1 is constituted by the rod 22, the link member 23, the air cylinder 21, and the like. That is, as shown in FIG. 1, when the retractable rod 21 a of the air cylinder 21 is contracted while the left blanket cylinder 1 is in contact with the left plate cylinder 8 and the right blanket cylinder 11, the rod 22 is pulled through the link member 23. The inner eccentric bearing 2 of the left blanket cylinder 1 rotates counterclockwise in the figure. The rotation shaft 4 of the left blanket cylinder 1 is displaced by the rotation of the eccentric bearing 2, and the left blanket cylinder 1 moves in a direction away from the left plate cylinder 8 and the right blanket cylinder 11 as shown in FIG. Further, when the turnbuckle 22a is operated, the length of the rod 22 changes, so that the rotation amount of the inner eccentric bearing 2 changes and the position of the left blanket cylinder 1 with respect to the left plate cylinder 8 and the right blanket cylinder 11 also changes. To do.

On the other hand, the eccentric bearing 1 of the right blanket cylinder 11
2 is also provided with a lever 12c.
A link member 33 is connected to c via a rod (first rod) 32 having a turnbuckle (fine adjustment device) 32a. The link member 33 is rotatably supported by a fixed pin 34 whose position is fixed with respect to the machine body frame, and the link member 33, the rod 32, and the lever 12c.
The rod 32 and the rod 32 are rotatably connected by pins 37 and 38, respectively. An air cylinder 31 is connected to the link member 33. The end of the air cylinder 31 on the main body side is rotatably supported by a fixing pin 35 whose position is fixed with respect to the body frame. End of the rod) 31a side is rotatably connected to the link member 36 by a pin 36.

In this embodiment, the rod 32, the link member 33, the air cylinder 31 and the like constitute an operating device for rotating the eccentric bearing 12 of the right blanket cylinder 11. That is, as shown in FIG. 4, when the expandable rod 31a of the air cylinder 31 is contracted while the right blanket cylinder 11 is in contact with the right plate cylinder 18, the rod 32 is pulled through the link member 33, and the right blanket cylinder 11 is pulled. The eccentric bearing 12 rotates clockwise in the figure. The rotation of the eccentric bearing 12 causes the right blanket cylinder 11 to rotate.
The rotary shaft 14 of the left blanket cylinder 1 is displaced from the left plate cylinder 8 as shown in FIG.
The gap between and moves in the direction of further expansion. Further, when the turnbuckle 32a is operated, the rotation amount of the eccentric bearing 12 changes due to the change in the length of the rod 32, and the right plate cylinder 18 of the right blanket cylinder 11 and the left blanket cylinder 1
The position relative to also changes.

In the cylinder attaching / detaching device of this embodiment, the left and right blanket cylinders 1 and 11 are independently moved as described above, which is compared with the conventional structure in which the left and right blanket cylinders are simultaneously moved. Therefore, the design range is wide due to the small mechanical constraint, and the constraint on the placement is small.
Therefore, the amount of movement of the blanket cylinders 1 and 11 at the time of removal of the cylinders is increased so that the blanket cylinders 1 and 11 move to the web 20.
It can be retracted to a position where it does not come into contact with.

By using the eccentric bearings 2 and 12 as the moving means of the blanket cylinders 1 and 11 as described above,
The blanket cylinders 1 and 11 can be moved smoothly and the strength of the movable part is sufficiently ensured. Further, by providing the air cylinders 21 and 31 and the turnbuckles 22a and 32a in series, the eccentric bearings 2 and 12 are largely rotated and the blanket cylinders 1 and 11 are largely moved by operating the air cylinders 21 and 31. In addition, the eccentric bearings 2 and 12 are finely rotated by the turnbuckles 22a and 32a, and the blanket cylinders 1 and 11 are rotated.
Can be moved minutely. Therefore, according to the configuration of the cylinder attaching / detaching device of the present embodiment, the same eccentric bearing 2 is used for the large movement as in the case of removing the cylinder and the small movement for adjusting the printing pressure.
There is also an advantage that it can be performed using 12. Further, by providing a link mechanism including link members 23 and 33 between the air cylinders 21 and 31 and the rods 22 and 32, it is possible to reduce the stroke amount of the air cylinders 21 and 31.

The rotation operation of the outer eccentric bearing 3 of the left blanket cylinder 1 is performed by the rod 41 with the turnbuckle 41a. The rod 41 has one end connected to a lever 3c provided on the outer eccentric bearing 3 via a pin 43, and the other end rotatably supported by a fixed pin 42 whose position is fixed with respect to the machine body frame. ing. This allows
When the turnbuckle 41a is operated, the length of the rod 41a changes, and the outer eccentric bearing 3 of the left blanket cylinder 1 rotates according to the expansion and contraction of the rod 41a. Due to the rotation of the outer eccentric bearing 3, the rotary shaft 4 of the left blanket cylinder 1 is displaced,
Left blanket cylinder 8 of left blanket cylinder 1 and right blanket cylinder 1
The position for 1 changes. By using the double eccentric bearing in this way, the left blanket cylinder 1 can be moved in two different directions (first direction and third direction) without complicating the structure.

According to the body attaching / detaching device of the present embodiment having the above-described structure, the body removing operation can be performed by the following procedure. First, as shown in FIG.
In the state where 8 and 18 are in contact with each other, the telescopic rod 21a of the air cylinder 21 is contracted. As a result, the left blanket cylinder 1 rotates about the axis C2 of the inner eccentric bearing 2 as shown by the arrow in FIG. 6B, and the space between the left blanket cylinder 1 and the left plate cylinder 8 and Blanket body 1,11
Gaps W2 and W1 are formed therebetween, and the left blanket cylinder 1 is in a non-contact state with the left plate cylinder 8 and the right blanket cylinder 11.

Further, the telescopic rod 31a of the air cylinder 31 is contracted from the state shown in FIG. 6 (b). As a result, the right blanket cylinder 11 has the eccentric bearing 12 with the axial center C1.
2 is rotated as shown by an arrow in FIG. 6C, and a gap W is formed between the right blanket cylinder 11 and the right plate cylinder 18.
3 is formed, the right blanket cylinder 11 and the right plate cylinder 18 are not in contact with each other, the gap between the blanket cylinders 1 and 11 is increased from W1 to W1 ′, and the left and right blanket cylinders 1 and 11 are It is in a non-contact state with the web 20. In this way, each blanket cylinder 1, 11
By retracting the blanket cylinders 1 and 11 to a position where they do not come into contact with 0, it is possible to stop the rotation of the blanket cylinders 1 and 11 regardless of the traveling of the web 20 when the cylinder is unrolled.

On the other hand, the trunk insertion operation can be performed by the following procedure. As shown in FIG.
In the state in which 8 and 18 are separated from each other, first, the telescopic rod 31a of the air cylinder 31 is extended. As a result, the right blanket cylinder 11 rotates about the axis C12 of the inner eccentric bearing 12 as shown by the arrow in FIG. 7B, comes into contact with the right plate cylinder 18, and the traveling line of the web 20. Approach (or contact) with.

Subsequently, the telescopic rod 21a of the air cylinder 21 is extended from the state shown in FIG. 7 (b). As a result, the left blanket cylinder 1 has the axial center C2 of the inner eccentric bearing 2
Rotate around as shown by the arrow in Fig. 7 (c),
The left plate cylinder 8 is contacted, and the right blanket cylinder 11 is contacted via the web 20 while further winding the web 20.

According to the body attaching / detaching device of this embodiment,
The printing pressure can be adjusted by the following procedure. First, in the state shown in FIG. 7D, the turnbuckle 3
2a is operated to adjust the length of the rod 32. Rod 3
The right blanket cylinder 11 makes a minute rotation about the axis C12 of the eccentric bearing 12 in accordance with the change in the length of 2 as indicated by the arrow in FIG. Accordingly, the printing pressure (nip pressure) in the nip portion N3 between the right blanket cylinder 11 and the right plate cylinder 18 is adjusted.

After adjusting the printing pressure at the nip portion N3, the length of the rod 22 is adjusted by operating the turnbuckle 22a.
The length of the rod 41 is adjusted by operating the turnbuckle 41a in parallel. The left blanket cylinder 1 slightly rotates around the axis C2 of the inner eccentric bearing 2 in accordance with the change in the length of the rod 22 as shown by a solid arrow in FIG. In accordance with the change in the length of the outer eccentric bearing 3, the outer eccentric bearing 3 is slightly rotated about the axis C3 as indicated by a broken line arrow in FIG. 7 (e). Since the rotation direction about the axis C2 and the rotation direction about the axis C3 are different (substantially orthogonal), by appropriately adjusting the amount of rotation around each axis C2, C3, The printing pressure at the nip portion N2 between the left blanket cylinder 1 and the left plate cylinder 8 and the printing pressure at the nip portion N1 of the left and right blanket cylinders 1 and 11 are adjusted in parallel.

As described above, the blanket cylinders 1, 18 are arranged with reference to the plate cylinders 8, 18 arranged parallel to the reference axis of the machine.
By positioning 11 and adjusting the printing pressure of each nip portion N1, N2, N3, the parallelism of the blanket cylinders 1 and 11 with respect to the reference axis of the machine is improved. Therefore, it is possible to accurately position the cylinders 1, 8, 11, and 18, and it is possible to prevent misregistration due to twisting of the cylinders 1, 8, 11, and 18.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the embodiment, as means for rotating the inner eccentric bearing 2 of the left blanket cylinder 1 and the eccentric bearing 12 of the right blanket cylinder 11, the turnbuckles 22a, 32a are used in combination with the air cylinders 21, 31. Alternatively, a driving device such as a servo motor or a linear actuator that can accurately position the rod length without any step may be used. Further, the means for moving the left and right blanket cylinders 1 and 11 is not limited to the one using an eccentric bearing, but may be a means for sliding the blanket cylinders in a linear direction.

[0045]

As described above in detail, according to the cylinder attaching / detaching device of the offset double-sided printing machine of the present invention, the corresponding blanket cylinder is positioned with reference to each plate cylinder, so that each cylinder can be accurately positioned. The positioning is possible, and there is an advantage that misregistration due to twisting of the body can be prevented.

Further, by making the first moving means and the second moving means for moving the respective blanket cylinders independently operable, the left and right blanket cylinders are simultaneously moved as in the conventional case. Since there are less mechanical restraints compared to the configuration and there are less restrictions on placement, it is possible to retract each blanket cylinder to a position where it does not contact the web when removing the cylinder, and it is possible to move the web when removing the cylinder. There is an advantage that it is possible to stop the rotation of each blanket cylinder regardless.

Further, when the eccentric bearing is used as the moving means of each blanket cylinder, there are advantages that smooth movement is possible and sufficient strength of the movable part can be secured. In this case, in particular, by using a structure in which a cylinder and a fine adjustment device are provided in series as a bearing operating device, the same eccentric bearing is used for both large movements such as when the cylinder is removed from the cylinder and minute movements during printing pressure adjustment. It becomes possible to do it.
Further, by dividing the rod connecting the eccentric bearing and the stationary member into two parts and interposing the link mechanism, the stroke amount of the cylinder can be reduced.

In addition to the above-mentioned first moving means and second moving means, a third movement for moving one blanket cylinder in a third direction different from the first direction and the second direction. When the means is provided, between the plate cylinder and the blanket cylinder,
Also, there is an advantage that the printing pressure at each nip portion between the left and right blanket cylinders can be adjusted. In particular, in this case, by adopting the double eccentric bearing for the one blanket cylinder, it is possible to move the one blanket cylinder in two different directions without inviting a complicated structure.

[Brief description of drawings]

FIG. 1 is a front view of a printing unit of an offset double-sided printing press for newspaper including a cylinder attaching / detaching device according to an embodiment of the present invention.

2 (a) is a side sectional view showing a structure of a bearing portion of the left blanket cylinder of FIG. 1, and FIG. 2 (b) is a side sectional view showing a structure of a bearing portion of the right blanket cylinder.

FIG. 3 is a schematic diagram showing a positional relationship between an axial center of each blanket cylinder of FIG. 1 and a rotation center of each eccentric bearing.

FIG. 4 is a view showing a state in which a cylinder for rotating the inner eccentric bearing of the left blanket cylinder is contracted in FIG.

5 is a view showing a state in which a cylinder for rotating the eccentric bearing of the right blanket cylinder is further contracted in FIG.

6A to 6C are diagrams showing an operation at the time of removing the cylinder in the printing unit of FIG. 1 in the order of (a) to (c).

7A to 7E are diagrams showing an operation at the time of inserting the cylinder and an operation at the time of adjusting the printing pressure in the printing unit of FIG. 1 in the order of (a) to (e).

FIG. 8 is a front view showing a configuration of a printing unit of a conventional offset double-sided printing press for newspapers.

FIG. 9 is a front view of a printing unit of a conventional offset double-sided printing machine for newspapers, which is equipped with a cylinder attaching / detaching device.

FIG. 10 is a diagram showing an operation at the time of removing the cylinder in the printing unit of FIG. 9 in the order of (a) and (b).

11A to 11D are diagrams showing the operation at the time of inserting the cylinder and the operation at the time of adjusting the printing pressure in the printing unit of FIG. 9 in the order of (a) to (d).

[Explanation of symbols]

1,11 blanket body 2 Inner eccentric bearing 2a, 3a, 12a sleeve 2b, 3b, 12b bearings 2c, 3c, 12c lever 3 Outer eccentric bearing 4,14 rotating shaft 8,18 plate cylinder 12 Eccentric bearing 20 Web 21,31 Air cylinder 21a, 31a Telescopic rod 22, 32, 41 rod 22a, 32a, 41a turnbuckle 23,33 Link member 24, 25, 34, 35, 42 Fixed pin C1 Shaft center of the left blanket cylinder C2 Center of rotation of the inner eccentric bearing of the left blanket cylinder C3 Center of rotation of the outer eccentric bearing of the left blanket cylinder C11 The center of rotation of the right blanket cylinder C12 Center of rotation of the eccentric bearing of the right blanket cylinder W1, W1 'Gap between the left and right blanket cylinders W2 Gap between left blanket cylinder and left plate cylinder W3 Gap between right blanket cylinder and right plate cylinder N1 Nip part of the left and right blanket cylinders N2 Nip between left blanket cylinder and left plate cylinder N3 Nip between right blanket cylinder and right plate cylinder

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16C 13/02 F16C 13/02 F term (reference) 2C034 AA16 AE03 AE06 AE54 3J103 AA02 BA43 CA01 CA63 DA05 FA18 FA20 FA26 GA02 GA54

Claims (9)

[Claims] 1. A cylinder attaching / detaching device of an offset double-sided printing machine, wherein a pair of blanket cylinders each having a plate cylinder are arranged so as to face each other across a web running line, wherein each plate cylinder has a fixed axial center position. A cylinder attaching / detaching device for an offset double-sided printing machine, which is arranged and has attachment / detachment means for attaching / detaching each of the blanket cylinders to / from a corresponding plate cylinder and a corresponding blanket cylinder. 2. The cylinder attachment / detachment device for an offset double-sided printing machine according to claim 1, wherein the corresponding blanket cylinder is positioned on the basis of each of the plate cylinders. 3. The attaching / detaching means comprises a first moving means for moving one blanket cylinder in a first direction, and a second moving means for moving the other blanket cylinder in a second direction different from the first direction. The cylinder attachment / detachment device for an offset double-sided printing press according to claim 1 or 2, comprising two moving means, wherein the first moving means and the second moving means can be operated independently. 4. The cylinder of an offset double-sided printing machine according to claim 3, wherein the first moving means and the second moving means retract the respective blanket cylinders to a position where they do not contact the web. Detachable device. 5. The first moving means and the second moving means each include an eccentric bearing that supports a corresponding blanket cylinder, and a bearing operating device that rotationally operates the eccentric bearing. The cylinder attaching / detaching device of the offset double-sided printing machine according to claim 3 or 4. 6. The bearing operating device comprises a rod which is arranged in a plane parallel to a rotation surface of the eccentric bearing and which connects the eccentric bearing and a stationary member, and which is provided on the rod and has two rod lengths. The cylinder attachment / detachment device of an offset double-sided printing press according to claim 5, characterized in that the cylinder attachment / detachment device comprises an adjusting cylinder and a fine adjusting device provided on the rod in series with the cylinder to finely adjust the rod length. 7. The rod is divided into a first rod connected to the eccentric bearing and a second rod connected to the stationary member, and the first rod and the second rod are connected via a link mechanism. The cylinder attachment / detachment device of the offset double-sided printing machine according to claim 6, wherein the cylinder attachment / detachment device is connected. 8. The third moving means for moving the one blanket cylinder in a third direction different from the first direction and the second direction is provided. 7. The cylinder attachment / detachment device for an offset double-sided printing machine according to any one of 7). 9. A double eccentric bearing that supports the one blanket cylinder, an inner eccentric bearing operating device that rotates and operates an inner eccentric bearing of the double eccentric bearing, and an outer eccentric bearing of the double eccentric bearing that rotates. An outer eccentric bearing operating device for operating, wherein the inner eccentric bearing and the inner eccentric bearing operating device constitute the first moving means, and the third outer eccentric bearing and the outer eccentric bearing operating device 9. The cylinder attaching / detaching device for an offset double-sided printing machine according to claim 8, wherein the moving means is configured.