JP2001113669A - Offset printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an offset printer having a paper thickness regulating mechanism reduced in size by decreasing the number of components without necessity of a complicated work for moving rotating centers of a plurality of rubber cylinders. SOLUTION: A rubber cylinder 600 (700) is eccentrically supported to a rubber cylinder shaft 601 (701). When the shaft 601 (701) is rotated, an axial center 600A (700A) of the cylinder 600 (700) is moved. A scale dial 901 is manually rotated, and an arm 919 is vertically moved by a rotary force of the dial 901 through a handle 902, a shaft 908, a bevel gear (gear 900 and a gear 911), a shaft 910, a bevel gear (gear 912, a gear 914) and a shaft 913. A link 961 and a link 971 are connected to the arm 919. When the arm 919 is vertically moved, the shaft 601 is rotated through the link 961, an L-shaped arm 963, links 635, 633 and an impression throw-on arm 631, and the shaft 701 is similarly simultaneously rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing press, and more particularly to an offset printing press provided with a mechanism for moving a rotation center of a blanket cylinder to adjust a contact state between the blanket cylinder and an impression cylinder.

[0002]

2. Description of the Related Art In general, an offset printing machine includes a plate cylinder having a desired plate formed on an outer periphery, an impression cylinder for holding and transporting a sheet as a printing medium on the outer periphery, and transferring ink from the plate cylinder. And a blanket cylinder for transferring the ink image transferred from the plate cylinder to the sheet held on the outer periphery of the impression cylinder. The blanket cylinder circumscribes both the plate cylinder and the impression cylinder, receives ink transfer on its own outer periphery by contact with the plate cylinder, and transfers the ink image formed on its own outer periphery to the sheet by contact with the impression cylinder. I do. Therefore, when the apparent radius of the impression cylinder changes due to the thickness of the sheet held on the outer periphery of the impression cylinder, the rotation of the impression cylinder and the blanket cylinder corresponds to the apparent radius of the impression cylinder. The center position must be adjusted so that the outer periphery of the blanket cylinder makes good contact with the sheet held on the outer periphery of the impression cylinder.

[0003] JP-B-48-32686, JP-A-9-7
JP-A-6453 and JP-A-10-315429 describe an offset printing machine having a cylinder inserting mechanism for moving a single blanket cylinder away from or closer to an impression cylinder or a plate cylinder.

According to Japanese Patent Publication No. 48-32686, the rotating shaft of the blanket cylinder is moved by rotating a deformed disk fixed to the rotating shaft of the blanket cylinder, and the blanket cylinder and the plate cylinder, and the blanket cylinder and the pressure Adjust the distance of the torso. The deformed disk is formed in a shape such that the distance between the blanket cylinder and the plate cylinder, and the distance between the blanket cylinder and the impression cylinder are set to desired distances depending on the rotation angle.

[0005] According to Japanese Patent Application Laid-Open No. 9-76453,
In order to adjust the contact pressure (printing pressure) between the pair of blanket cylinders, an eccentric bearing that supports the rotation shaft of the blanket cylinder is provided with a printing pressure adjusting lever, and the eccentric bearing is rotatable.

According to Japanese Patent Application Laid-Open No. 10-315429, the positional relationship is such that the rotational center of the blanket cylinder exists on a straight line connecting the rotational center of the eccentric bearing for supporting the blanket cylinder and the rotational center of the plate cylinder. At times, the impression pressure of the blanket cylinder and impression cylinder is at a maximum. When the eccentric bearing is rotated around the rotation center of the eccentric bearing, the rotation center of the blanket cylinder moves, and the printing pressure changes.

[0007] According to the cylinder insertion mechanism described above, the distance between the rotation center of the blanket cylinder and the rotation center of the impression cylinder is adjusted by moving the rotation center axis of the blanket cylinder, and the outer peripheral surface of the blanket cylinder is adjusted. The distance from the outer peripheral surface of the impression cylinder can be set to a desired value. With this configuration, the position of the blanket cylinder can be finely adjusted, and the contact state between the blanket cylinder and the impression cylinder / plate cylinder can always be kept good. In addition, by adjusting the position of the blanket cylinder according to the paper thickness, it is possible to perform good printing.

[0008]

However, in the offset printing press having the above-described cylinder inserting mechanism, in an offset printing press for two-color printing or more, a single impression cylinder is provided with two or more blanket cylinders. In such a case, there is a disadvantage that the number of parts increases and the size of the product increases. In addition, the position of the center of rotation of each blanket cylinder must be separately adjusted according to the thickness of the sheet, and the operation is complicated.

Accordingly, an object of the present invention is to provide an offset printing press having a plurality of blanket cylinders, in which the number of parts can be reduced and the size can be reduced. In addition, a complicated operation for moving the rotation centers of a plurality of blanket cylinders is not required, and a plurality of blanket cylinders are simultaneously moved by one operation, and the contact of each blanket cylinder with an impression cylinder is performed by this operation. An object of the present invention is to provide an offset printing press in which pressures can be made equal to each other.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises frames 3a and 3b forming an outer periphery of an apparatus, and ink images formed on the outer periphery thereof, which are rotatably provided on the frames 3a and 3b. At least two blanket cylinders 600, 700
And circumscribes the blanket cylinders 600 and 700, and transports the sheet by placing the sheet on its peripheral surface.
Impression cylinder 40 for transferring each of the ink images to the sheet.
0 and the axes 600A, 700 of the blanket cylinders 600, 700.
A and a paper thickness adjusting mechanism 630, 730, 900 for adjusting the distance between the shaft center 400A of the impression cylinder 400 and the paper thickness adjusting mechanism 630, 7
Reference numerals 30 and 900 denote a single operation unit 901 and the two or more blanket cylinders 60 connected to the single operation unit 901.
0, 700, and an interlocking mechanism 900 provided with an interlocking mechanism 900 for simultaneously moving the axes of the two or more blanket cylinders 600, 700 by the same distance by a driving force generated by operating the operation unit 901. ing.

[0011] Further, each of the blanket cylinders 600, 700
The blanket cylinder shafts 601, 701 rotatably supported by the frames 3a, 3b are rotatably supported by the blanket cylinder shafts 601, 701.
The rotary shafts 601A and 701A of the
The shaft centers 600A, 700A of 0, 700 are arranged eccentrically, and the shaft centers 600A, 700A of the blanket cylinders 600, 700 move in the radial direction by the rotation of the blanket cylinder shafts 601 and 701 to form a structure. The operation unit 901 is a rotation operation unit 9
01 to generate a rotational driving force,
Are conversion mechanisms 902 to 919 for converting the rotational motion of the rotary operation unit 901 into linear motion, and link mechanisms 961 to 964, 97 connected to the conversion mechanisms 902 to 919.
1 to 974, and the link mechanisms 961 to 96
4, 971 to 974 are connected to the blanket cylinder shafts 601 and 701, respectively, and preferably convert the linear motion of the conversion mechanisms 902 to 919 into the rotary motion of the blanket cylinder shafts 601 and 701.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Overall Configuration An offset printing press according to an embodiment of the present invention will be described with reference to FIGS. First, an outline of the configuration of the offset printing press according to the present embodiment will be described with reference to FIG. The offset printing press shown in FIG. 1 forms a framework of the offset printing press, and has frames 3a and 3b facing each other.
(FIG. 4) is provided. And the frames 3a, 3
b, and is provided with an impression cylinder 400 that conveys the sheet by rotating while holding the sheet on the peripheral surface.
Further, in order to print on a sheet held on the peripheral surface of the impression cylinder 400, the blanket cylinder 6 inserted into the frames 3a and 3b is used.
The ink unit 800 includes 00, 700, plate cylinders 811, 812, and ink roller groups 801, 802, 803, 804.

A paper feed mechanism for supplying a sheet as a printing medium to the impression cylinder 400 is disposed on one side of the impression cylinder 400. The paper supply mechanism includes a paper supply unit 1 for storing sheets as print media, a feeder board 100 for supplying the sheets stored in the paper supply unit 1 to the impression cylinder 400, an infeed unit 200, and a paper supply cylinder 300. Consists of The infeed unit 200 includes a front contact mechanism 220 that abuts on the leading edge of the sheet to temporarily prevent the conveyance of the sheet, a horizontal needle mechanism 210 that adjusts the position of the sheet in the width direction, and a feeder board 1.
A swing mechanism 230 for delivering the sheet conveyed from 00 to the paper feed cylinder 300 is provided.

On the other side of the impression cylinder 400, a sheet ejection mechanism 500 for ejecting a printed sheet on which the ink images have been transferred from the blanket cylinders 600 and 700 on the impression cylinder 400 is arranged. The paper discharge mechanism 500 includes paper discharge sprockets 501 and 50.
2, and a chain 510 returned to the discharge sprocket;
Discharge grippers 520 and 53 provided on the chain 510
Has zero. In the vicinity of the paper discharge mechanism 500, there is a paper discharge mechanism 50.
0 is provided with a paper discharge pile 2 for accumulating the printed sheets conveyed by 0.

Paper feed cylinder 300, impression cylinder 400, blanket cylinder 600, 7
00, the plate cylinders 811 and 812 are substantially cylindrical members,
The axes extend parallel to each other, and each of the axes 300A,
Rotate around 400A, 600A, 700A, 811A, 812A. Further, the two paper ejection sprockets 501 and 502 constituting the paper ejection unit 500 also rotate about an axis parallel to the paper feed cylinder 300 and the like. Each rotation direction is as shown in FIG. As shown in FIG.
0, paper ejection sprocket 501 of paper ejection section 500, blanket cylinder 6
Reference numerals 00 and 700 substantially circumscribe the impression cylinder 400, and the plate cylinder 81
1 circumscribes the blanket cylinder 600 and the plate cylinder 812 circumscribes the blanket cylinder 700, respectively.

A motor (not shown) for supplying a driving force to the offset printing press is provided, and an output shaft (not shown) of the motor is connected to an axis 400A of the impression cylinder 400.
The blanket cylinders 600 and 700 are driven by the rotational force of the impression cylinder 400, and the plate cylinders 811 and 821 are
It is configured to be driven by a rotational force of 0,700. Further, the paper feed cylinder 300 is configured to be driven by the rotational force of the impression cylinder 400. The front setting mechanism 220 and the horizontal needle mechanism 210 are configured to be driven by the rotational force of the paper feed cylinder 300, and the feeder board 100 is configured to drive the front setting mechanism 220 and the horizontal needle mechanism 210 (not shown). , And the sheet is conveyed from right to left in FIG. 1. Further, the paper ejection prokets 501 and 502 for transporting the chain 510 provided in the paper ejection mechanism 500 are provided with the impression cylinder 400.
It is configured to be driven by the rotational force of.

The feeder board 100 of the paper feeding mechanism has a belt-conveyor shape. The sheets stored in the paper feeding unit 1 are placed on the upper surface of the feeder board 100, and are conveyed toward the infeed unit 200.
The front contact mechanism 220 is provided between the feeder board 100 and the swing mechanism 230 and includes a front contact portion (not shown).
And a front contact portion drive mechanism (not shown). The front contact portion is driven by the front contact drive mechanism by the feeder board 100.
Is configured to be movable between an intrusion position where the sheet intrudes on the conveyance path between the sheet and the swing mechanism 230 and a retreat position which deviates from the conveyance path. When the sheet is moved to the retreat position, the sheet is allowed to be conveyed.

The horizontal needle mechanism 210 is connected to the feeder board 10
0 and the front contact mechanism 220 for moving the sheet in the width direction of the sheet to adjust the sheet to a predetermined position on the transport path. The horizontal needle mechanism 210 includes a sheet holding unit (not shown) and a sheet holding unit driving mechanism (not shown). The sheet holding unit is provided on a sheet conveyance path between the feeder board 100 and the front contact unit of the front contact mechanism 220, and is capable of holding the sheet and moving in the width direction of the sheet by the sheet holding unit driving mechanism. It is configured.

The swing mechanism 230 includes a swing gripper 231 for holding and releasing a sheet, and a swing gripper drive mechanism (not shown) for moving the swing gripper 231. The swing gripper drive mechanism
The swing gripper 231 is moved from a position close to the feeder board 100 to a standby position (not shown) through the vicinity of the outer peripheral surface of the paper feed cylinder 300, and is again moved from the standby position to the paper feed cylinder 30.
0 and can move to a position from the feeder board 100 through the vicinity of the outer peripheral surface of the swing gripper 231.
Sheet feeding cylinder 30 in conjunction with the sheet holding / release operation of
0.

On the outer peripheral surface of the paper feed cylinder 300, a paper feed cylinder gripper 310 for holding a sheet is provided.
Is configured to convey the sheet held on the outer peripheral surface by rotating. More specifically, the sheet feeding cylinder gripper 310 receives a sheet from the swing gripper unit 231 and transfers the sheet from the sheet feeding cylinder gripper 310 to an impression cylinder gripper 410, 4
20 and 430.

Although the total length of the chain 510 of the paper discharge mechanism 500 is substantially equal to an integral multiple of the outer peripheral length of the blanket cylinders 600 and 700, in the present embodiment, approximately 2 of the outer peripheral length of the blanket cylinders 600 and 700 is used.
The length is equal to twice. Printed sheet ejection mechanism 50
The paper discharge grippers 520 and 530 for holding at 0 are fixed to the chain 510 and move with the conveyance of the chain 510. The discharge grippers 520 and 530 are provided with the blanket cylinder 60.
The outer circumferences 0 and 700 (in this embodiment, twice as long as the circumference of each segment of the impression cylinder 400) are spaced apart from each other by a length substantially equal to the length. Also, the paper ejection gripper 52
Reference numerals 0 and 530 denote press drum grippers 410, 420, and 430, which will be described later, with the conveyance of the paper discharge mechanism 500 and the rotation of the pressure drum 400.
Are arranged so that when any one of them reaches the closest position between the impression cylinder 400 and the paper discharge mechanism 500, it reaches the closest position at the same time and can cross the impression cylinder grippers 410, 420, and 430. The paper discharge grippers 520 and 530 are configured to receive a sheet and release the sheet near the paper discharge pile 2 when reaching the closest position between the paper discharge mechanism 500 and the impression cylinder 400.

In the embodiment, the ink unit 800 employs a printing device using four colors of ink. In this case, magenta, cyan, yellow, and black are generally used as the four colors used for the ink. Ink roller group 8
Reference numerals 01, 802, 803, and 804 are for supplying inks of different colors to the plate cylinders 811 and 812, respectively.

The peripheral surfaces of the plate cylinders 811 and 812 are equally divided into two plate regions 811a and 811b or 812a and 812b in the circumferential direction. Four plate areas 811a,
811b, 812a, and 812b are formed with plates corresponding to the respective colors corresponding to the ink roller groups 801, 802, 803, and 804, respectively. It is configured to be supplied. Plate cylinders 811 and 812
Is for forming an ink image on the peripheral surface of the blanket cylinders 600 and 700.

The peripheral surfaces of the blanket cylinders 600 and 700 are
1, 812, and two color regions 600a and 600b, or 700a and 700b, which are the same number of divisions as the outer peripheral surfaces of the plate cylinders 811 and 812 in the circumferential direction.
It is divided equally. Plate cylinders 811 and 812 and blanket cylinder 6
The rotation speeds of 00 and 700 are equal, and the peripheral surfaces circumscribing each other are configured to rotate without deviation.
Four color areas 600a on the peripheral surface of the blanket cylinders 600 and 700,
600b, 700a, and 700b each correspond to the plate cylinder 81 described above.
1, 812, four plate areas 811a, 811b,
812a and 812b, and the blanket cylinders 600 and 7
00 and the rotation of the plate cylinders 811 and 812, the color area 600
a, 600b, 700a, and 700b correspond to the plate areas 811a, 811b, and 81, respectively.
They are arranged so as to coincide with the start points (or end points) of 2a and 812b.

The outer peripheral surface of the impression cylinder 400 extends in the circumferential direction in the color regions 600a, 600b, 700 of the blanket cylinders 600, 700.
The segments are equally divided into three segments 400a, 400b, and 400c having the same length as the circumferences of the segments a and 700b. At the head of each of the segments 400a, 400b, 400c, there are provided impression cylinder grippers 410, 420, 430 for holding a sheet on the outer peripheral surface of the impression cylinder 400.
While the plate cylinders 811 and 812 and the blanket cylinders 600 and 700 make one rotation, the impression cylinder 400 makes two-thirds rotation, and is configured to rotate without any deviation on the peripheral surfaces circumscribing each other. Also, with the rotation of the impression cylinder 400 and the blanket cylinders 600 and 700, the segments 400a and 40
0b and 400c are the starting points (or ending points) of the blanket cylinder 60.
Color areas 600a, 600b, 70 on the outer circumference of 0, 700
0a and 700b are arranged so as to coincide with one of the start points (or end points).

With the above configuration, when printing is performed on a sheet, the sheet stored in the sheet feeding unit 1 is transferred to the infeed unit 200 by the feeder board 100. Here, the sheet is positioned by the front contact mechanism 220 and the horizontal needle mechanism 210, held by the swing gripper unit 231 of the swing mechanism 230, and delivered to the paper feed cylinder gripper 310 of the paper feed cylinder 300. The sheet held on the outer peripheral surface of the feed cylinder 300 by the feed cylinder gripper 310 is
00, is transported to the vicinity of the impression cylinder 400,
00 is transferred to the impression cylinder grippers 410, 420, and 430, and is held on the outer peripheral surface of the impression cylinder 400. Here, the sheet is held on the outer peripheral surface of the impression cylinder 400 while the impression cylinder 400 rotates approximately two times, and is held on the outer peripheral surface of the impression cylinder 400 while being conveyed, while the rubber cylinder contacting the outer peripheral surface of the impression cylinder 400. 600, 7
00 is transferred. The sheet on which the transfer of the ink images for all four colors has been performed is the impression cylinder gripper 410,
From 420 and 430, the paper ejection gripper 52 of the paper ejection mechanism 500
0, 530, is conveyed by the chain 510, and is accumulated in the paper discharge pile 2.

An operation for forming an ink image on a sheet provided on the outer peripheral surface of the impression cylinder 600 will be described.
By the ink roller groups 801, 802, 803, 804, each plate area 811 a, 8 on the peripheral surface of the plate cylinder 811, 812.
The ink is supplied to 11b, 812a, and 812b. Here, the ink roller group 801 supplies ink only to the plate area 811a, and the ink roller group 802 supplies ink to the plate area 811a.
11b to supply ink only to the ink roller group 803.
Supplies ink only to the plate region 812a, and the ink roller group 804 supplies ink only to the plate region 812a.
This operation is performed by rotating the plate cylinders 811 and 812 counterclockwise in FIG. 1 around the rotation centers 811A and 812A, which are also the axes of the respective cylindrical shapes.
a, 811b, 812a, and 812b relatively move with respect to the ink roller groups 801, 802, 803, and 804.

Next, plate cylinders 811 and 812 to which ink has been supplied.
Color regions 600 of the blanket cylinders 600, 700 to which the respective plate regions 811a, 811b, 812a, 812b correspond.
a, 600b, 700a, 700b by contacting the respective color regions 600a, 600b, 700a, 700b.
Then, a corresponding ink image is formed. Blanket cylinder 600, 7
Reference numeral 00 is rotatably supported by blanket cylinder shafts 601 and 701, and the blanket cylinders 600 and 700 rotate clockwise in FIG. 1 around rotation centers 600A and 700A that are also cylindrical axes. At this time, as described above, the plate cylinder 81
1 and 812 are the rotation centers 811A and 811, respectively, as described above.
It is rotating around 2A. Thus, the plate cylinders 811 and 8
12, plate regions 811a, 811b, 8 provided on the peripheral surface
12a, 812b and color regions 600a, 600b, 700a, 700 provided on the peripheral surface of the blanket cylinders 600, 700.
b contact with each other without friction, and the plate areas 811a,
The entire surface of 811b, 812a, 812b is a color area 600
a, 600b, 700a, and 700b at the time of contact with the entire surface, complete ink images are formed in the color areas 600a, 600b, and 7b.
00a, 700b.

Further, blanket cylinders 600 and 7 on which ink images are formed.
00 each color area 600a, 600b, 700a, 700
b, each segment 400a, 400b of the impression cylinder 400,
Each of the color areas 600a, 600b, 700a, 7
The ink image formed on the sheet 00b is transferred to a sheet.

(2) Adjustment of the Rotation Centers 600A and 700A of the Blanket Cylinder If the blanket cylinders 600 and 700 are always kept in contact, a problem may occur. The blanking cylinder 600 must be separated from the plate cylinder 811 by removing the cylinder when printing is not performed. Further, unless the contact pressure between the blanket cylinders 600 and 700 and the impression cylinder 400 is changed according to the thickness of the sheet as a print medium, good printing may not be performed.

Therefore, blanket cylinders 6 and 7 are provided with blanket cylinder 6.
In order to switch the contact and non-contact states between the outer periphery of the cylinders 00 and 700 and the outer periphery of the plate cylinders 811 and 812, the blanket cylinders 600 and 700 are switched.
Are provided with blanket / plate cylinder body inserting means 610 and 710 for moving the positions of the rotation centers 600A and 700A (FIGS. 2 to 4). In addition, the blanket cylinders 600, 700 are provided on the blanket cylinders 600, 700 in order to switch between a contact state and a non-contact state between the outer periphery of the blanket cylinder 600, 700 and the outer periphery of the impression cylinder 400.
Rubber blanket / press cylinder insertion means 630 and 730 for moving the positions of the 0 rotation centers 600A and 700A are also provided (FIG. 2). Further, the outer circumference of the impression cylinder 400 and the blanket cylinder 60 are adjusted according to the thickness of the sheet held on the outer circumference of the impression cylinder 400.
A scale dial mechanism 900 is provided for simultaneously and finely adjusting the outer peripheral distances of 0 and 700 by the same distance (FIG. 2). Blanket cylinder / impression cylinder body insertion means 630,
The scale dial mechanism 900 connected to 730 corresponds to the paper thickness adjusting mechanism of claim 1.

The blanket cylinders 600 and 700 are respectively provided with blanket cylinder shafts 601 and 701 (FIG. 4) penetrating the frame 3a and the frame 3b.
Are supported rotatably about the blanket cylinder rotation centers (the blanket cylinder axis) 600A and 700A, and are rotated about the blanket cylinder rotation centers 600A and 700A by the motor. Here, the rotation centers 601A, 701 of the blanket cylinder shafts 601, 701
1A (FIG. 2), the blanket cylinder rotation center 600
A and 700A are eccentric structures. The blanket cylinder shafts 601 and 701 are provided with eccentric housings 611a described later,
611b and the eccentric housings 711a and 711b support the frame 3a and the frame 3b, respectively.

First, the blanket cylinder / plate cylinder body inserting means 610 will be described. An eccentric housing 611a which supports one end of the blanket cylinder shaft 601 and penetrates the frame 3a,
An eccentric housing 611b that supports the other end of the frame 01 and penetrates the frame 3b is provided. Eccentric housing 6
11a and 611b are symmetrical with respect to the frames 3a and 3b, and are rotatably supported by the frames 3a and 3b, respectively, as shown in FIG. The eccentric structure supports the blanket cylinder shaft 601 at the position. That is, the eccentric housing 611
When a and 611b rotate, the blanket cylinder shaft 601 moves perpendicularly to its own axial direction by drawing an arc around the rotation center 611A of the eccentric housings 611a and 611b. As described above, the blanket cylinder 600 is provided on the blanket cylinder shaft 601 so as to be rotatable around the axis 600A of the blanket cylinder 600, and the shaft center (rotation center) 6 of the blanket cylinder 600 is provided.
00A has an eccentric structure supported at a position deviated from the rotation center 601A of the blanket cylinder shaft 601.

As shown in FIG. 2, the eccentric housing 611
The end of a link 613a is rotatably connected to a through a pin 612a, and the other end of the link 613a is rotatably connected to one end of an arm 615a through a pin 614a. . Near the center of the arm 615a,
Is passed through the frame 3a and the frame 3b,
One end of a shaft 616 rotatably supported by the frame 3a and the frame 3b is fixed.
The arm 16 and the arm 615a rotate integrally about the axis of the shaft 616.

One end of a link 618 is connected to the other end of the arm 615a via a pin 617, and one end of the link 620 and the air cylinder 622 are respectively turned to the other end of the link 618 by a pin 619. Movably connected.
The other end of the link 620 is rotatably connected to the frame 3a by a stud 621. The air cylinder 622 is rotatably supported by the frame 3a by studs 623. Air cylinder 622
Becomes longer or shorter depending on the on / off operation.

As shown in FIG. 3, one end of a link 613b is rotatably connected to the eccentric housing 611b via a pin 612b, and further to the other end of the link 613b via a pin 614b. One end of the arm 615b is rotatably connected. The other end of the shaft 616 is fixed to the other end of the arm 615b, and the shaft 616 and the arm 615b are
It rotates integrally about 16 axes. Therefore, the arm 615a and the arm 615b rotate integrally via the shaft 616.

The blanket cylinder / plate cylinder body inserting means 710 includes the impression cylinder 400
It has the same configuration as the blanket cylinder / plate cylinder insertion means 610 at a position symmetrical to the blanket cylinder / plate cylinder insertion means 610 with respect to. The members constituting the blanket cylinder / plate cylinder insertion means 710 are the same as the members constituting the blanket cylinder / plate cylinder insertion means 610.
Are indicated by reference numbers with the addition of 00,
It has the same configuration as the member of the plate cylinder insertion means 610.

Next, the outer periphery of the blanket cylinders 600 and 700 and the impression cylinder 40
In order to switch between the contact and non-contact states with the outer periphery of the cylinder 0, the blanket and impression cylinder inserting means 630, 73 for moving the position of the rotation center 600A, 700A of the blanket cylinder 600, 700.
0 will be described. First, means 6 for inserting the blanket cylinder and impression cylinder
30 will be described. A barrel insertion arm 631 fixed to one end of a blanket cylinder shaft 601 is provided. As shown in FIG. 4, the barrel insertion arm 631 is
It is configured to rotate integrally with the blanket cylinder shaft 601 about one rotation center 601A. On the other hand, as mentioned above,
The rotation center 601A of the blanket cylinder shaft 601 is eccentric with the rotation center 600A of the blanket cylinder 600, and
When 1 rotates, the rotation center 600A of the blanket cylinder 600 becomes
The blanket cylinder 600 has a structure in which the blanket cylinder 600 moves vertically with respect to the axis of the blanket cylinder shaft 601 by drawing an arc around the rotation center 601A. As described above, the blanket cylinder 600 is provided on the blanket cylinder shaft 601 so as to be rotatable around the rotation center 600A of the blanket cylinder 600. However, the blanket cylinder shaft 601 that is also the rotation center of the barrel insertion arm 631 is provided. The rotation center 811A of the plate cylinder 811 is substantially placed on the plane connecting the rotation center 601A and the rotation center 600A of the blanket cylinder 600.

As shown in FIG. 2, one end of a link 633 is connected to the trunk insertion arm 631 via a pin 632, and one end of the link 635 is connected to the other end of the link 633 by a pin 634. Each of the cylinders 637 is rotatably connected. The other end of the link 635 is a pin 636
, And is rotatably connected to the L-shaped arm 963. The L-shaped arm 963 is provided with a paper thickness adjusting device 90 described later.
0, and is rotatably supported on the frame 3a by studs 964.
The position is determined by the operation 1. That is, unless the scale dial 901 is operated, the rotational position of the L-shaped arm 963 is fixed, and the position of the pin 636 provided on the L-shaped arm 963 does not move. The air cylinder 637 is rotatably connected to the frame 3a by studs 638. Air cylinder 637
Becomes longer or shorter depending on the on / off operation.

The blanket cylinder / impression cylinder inserting means 730 is provided for the impression cylinder 400.
It has the same configuration as the blanket and impression cylinder inserting means 630 at a position symmetrical to the blanket and impression cylinder inserting means 630 with the. The members constituting the blanket cylinder / impression cylinder insertion means 730 are the same as the members constituting the blanket cylinder / impression cylinder insertion means 630.
Are indicated by reference numbers with the addition of 00,
It has the same configuration as the member of the impression cylinder body inserting means 630.

Next, the scale dial mechanism 900 will be described. This mechanism operates the impression cylinder 400 by a user operation.
Depending on the thickness of the sheet held on the outer periphery of the impression cylinder 400
Distance between the axis 400A and the axis 600A of the blanket cylinder 600,
And the axis 400A of the impression cylinder 400 and the axis 7 of the blanket cylinder 700.
This is a mechanism for changing the distance to 00A so that it can be finely adjusted simultaneously and by the same distance.

The scale dial mechanism 900 is provided with a scale dial 901 which is provided with a scale of paper thickness and which is manually rotated by a user. Scale dial 901
One end of a handle shaft 902 provided in parallel with the frame 3a is connected to the center of rotation of, so that the scale dial 901 and the handle shaft 902 rotate integrally. A bracket 90 is provided on the frame 3a.
3, 904 are fixed, and the handle shaft 902
Is rotatably supported on the frame 3a by brackets 903 and 904. Near the other end of the handle shaft 902, a plate 905 is provided.
05 is fixed to the frame 3a by studs 906. Further, the plate 905 is provided with a block 907, and the block 907 allows the other end of the handle shaft 902 to turn to a surface on the plate 905 opposite to the surface facing the frame 3a. (FIG. 5). Also, a shaft 908 is coaxially fixed at the other end of the handle shaft 902,
A helical gear 909 is fixed to the shaft 908, and the handle shaft 902 and the helical gear 909 rotate integrally. In the vicinity of the helical gear 909, a shaft 910 rotatably supported by the frame 3a and penetrating the plate 905 is provided, and a tip of the shaft 910 protruding from the plate 905 on the side opposite to the frame 3a is provided with a helical gear. A helical gear 911 that meshes with 909 is fixed. A helical gear 912 is fixed to a portion of the shaft 910 between the plate 905 and the frame 3a, and the helical gear 912 is
It is configured to rotate integrally with the helical gear 911 via the zero. Near the other end of the shaft 910 supported by the frame 3a, a shaft 913 extending parallel to the frame 3a is provided with a slide bearing 915 fixed to the frame 3a by bolts 916, and a thrust bearing 91.
7 and a chrysanthemum nut 918 so as to be rotatable on the frame 3a. A helical gear 914 is fixed to one end of the shaft 913, and the helical gear 914 meshes with the helical gear 912. At the other end of the shaft 913, a threaded portion 913a is formed, and the frame 3a
Is connected to one end of a rod-shaped arm 919 which is non-rotatably supported. Specifically, a hole 919a is formed at one end of the arm 919, and a female thread 919b is formed on the peripheral surface of the hole 919a. The two are connected by matching. With such a configuration, when the helical gear 914 rotates, the shaft 913 rotates integrally with the helical gear 914, and the arm 919 screwed to the shaft 913 moves up and down relatively to the shaft 913.

An eccentric stud 9 is provided near the other end of the arm 919.
21 is provided to prevent the arm 919 from excessively moving downward in FIG. A pin 920 is provided at the other end of the arm 919, and one end of the link 961 and one end of the link 971 are rotatably connected. One end of the L-shaped arm 963 is rotatably connected to the other end of the link 961 by a pin 962. A stud 964 fixed to the frame 3 a is rotatably connected to a corner of the L-shaped arm 963.
The link 635 is rotatably connected to the other end of the link 63 by the pin 636 as described above.

Similarly, the other end of the link 971 has a pin 97
2, one end of the L-shaped arm 973 is rotatably connected. A stud 974 fixed to the frame 3a is rotatably connected to a corner of the L-shaped arm 973, and a link 735 is rotatably connected to the other end of the L-shaped arm 973 by a pin 736. Have been. Link 9
71, L-shaped arm 973, link 735, ring 73
3. The shape of the trunk insertion arm 731 is the same as the shape of the link 961, the L-shaped arm 963, the link 635, the link 633, and the trunk insertion arm 631, and is symmetrically arranged.

The operation of adjusting the positions of the rotation centers 600A and 700A of the blanket cylinders 600 and 700 based on the above configuration will be described.

The adjustment of the contact state between the outer peripheral surface of the blanket cylinder 600 and the outer peripheral surface of the plate cylinder 811 is performed by the operation of the blanket cylinder / plate cylinder insertion means 610. FIG. 2 shows a state where the air cylinder 622 is elongated. In this state, the link 620 and the link 618 extend linearly via the pin 619, and the distance from the stud 621 to the pin 617 increases. In this position, the arm 615a has the shaft 616
2, the link 613a is at the upper left position in FIG. 2, and the eccentric housing 611a is in the clockwise direction in FIG. Similarly, the arm 615b in FIG. 3 is in a position rotated clockwise in FIG. 3 (counterclockwise in FIG. 2), and the link 613b is in a position in the upper right direction (upper left in FIG. 2) in FIG. In this case, the eccentric housing 611b is in a state rotated in a counterclockwise direction in FIG. 3 (clockwise direction in FIG. 2). Accordingly, the blanket cylinder shaft 601 supported by the eccentric housings 611a and 611b moves substantially upward in FIG.
Rotation center 6 of blanket cylinder 600 fixed to blanket cylinder shaft 601
00A also moves substantially upward in FIG. Thus, the rotation center 600A of the blanket cylinder 600 is changed to the rotation center 81 of the plate cylinder 811.
1A, the blanket cylinder 600 and the plate cylinder 811 can be brought into contact.

On the other hand, the positional relationship when the air cylinder 622 is shortened is the positional relationship shown by the one-dot chain line in FIG. In this state, link 620 and link 6
18 form a dogleg shape via the pin 619, and the distance from the stud 621 to the pin 617 is reduced. In this position, the arm 615a is in a position rotated clockwise in FIG. 2 together with the shaft 616, the link 613a is in a lower right position in FIG. 2, and the eccentric housing 611a is in the counterclockwise direction in FIG. It is in a state of turning in the direction. Similarly, the arm 615b in FIG. 3 is at a position rotated counterclockwise in FIG. 3 (clockwise in FIG. 2).
The link 613b is located at the lower left direction in FIG. 3 (lower right direction in FIG. 2), and the eccentric housing 611b is rotated clockwise in FIG. 3 (counterclockwise in FIG. 2). Thereby, the blanket cylinder shaft 601 supported by the eccentric housings 611a and 611b moves substantially downward in FIG. 2, and the rotation center 600A of the blanket cylinder 600 fixed to the blanket cylinder shaft 601.
Also move substantially downward in FIG. Thus, the blanket cylinder 600
Can be moved away from the rotation center 811A of the plate cylinder 811 to separate the blanket cylinder 600 and the plate cylinder 811 from each other.

The operation for switching between the contact state and the non-contact state between the outer peripheral surface of the blanket cylinder 700 and the outer peripheral surface of the plate cylinder 812 is performed by using the blanket cylinder / plate cylinder inserting means 710 as described above.
The operation is performed in the same manner as described above.

Next, switching between the contact state and the non-contact state between the outer peripheral surface of the blanket cylinder 600 and the outer peripheral surface of the impression cylinder 400 is performed by the operation of the blanket / impression cylinder insertion means 630. FIG. 2 shows a state where the air cylinder 638 is elongated. In this state, the link 633 and the link 635 extend linearly via the pin 634, and the distance from the pin 636 to the pin 632 increases. Here, as described above, the L-shaped arm 9
The rotation position of 63 is fixed unless the scale dial 901 is operated, and the position of the pin 636 provided on the L-shaped arm 963 does not move. Therefore, in a state where the L-shaped arm 963 is fixed at the position shown in FIG. 2, the barrel insertion arm 631 is integrated with the blanket cylinder shaft 601 about the rotation center 601A of the blanket cylinder shaft 601 in FIG. It is in a position rotated clockwise. Thereby, the rotation center 60 of the blanket cylinder 600 supported by the blanket cylinder shaft 601 is set.
Since 0A moves clockwise in FIG. 2 around the rotation center 601A of the blanket cylinder shaft 601, the rotation center 600A of the blanket cylinder 600 moves substantially to the left in FIG. Thus, the rotation center 600A of the blanket cylinder 600 is
00A, the blanket cylinder 600 and the impression cylinder 400 can be brought into contact.

On the other hand, the positional relationship when the air cylinder 638 is shortened is the positional relationship shown by the one-dot chain line in FIG. In this state, link 633 and link 6
35 form a dogleg via pin 634 and pin 6
The distance from 36 to pin 632 is reduced. Here, as described above, the L-shaped arm 963 is fixed unless the scale dial 901 is operated, and the position of the pin 636 provided on the L-shaped arm 963 does not move.
Therefore, when the L-shaped arm 963 is fixed at the position shown in FIG.
2, it is at a position rotated counterclockwise in FIG. 2 around the rotation center 601A of the blanket cylinder shaft 601.
Thereby, blanket cylinder 600 supported on blanket cylinder shaft 601 is provided.
Is the rotation center 601 of the blanket cylinder shaft 601.
In order to move counterclockwise in FIG.
The center of rotation 600A of 00 moves substantially rightward in FIG.
Thus, the rotation center 600A of the blanket cylinder 600 is
The blanket cylinder 600 and the impression cylinder 400 can be spaced apart from the zero rotation center 400A.

The operation for switching between the contact state and the non-contact state between the outer peripheral surface of the blanket cylinder 700 and the outer peripheral surface of the impression cylinder 400 is as follows.
This is performed by operating in the same manner as 0.

Next, according to the thickness of the sheet held on the outer periphery of the impression cylinder 400 by the scale dial mechanism 900,
An operation for simultaneously adjusting the distance between the axis of the impression cylinder 400 and the axis of the blanket cylinder 600 and the distance between the axis of the impression cylinder 400 and the axis of the blanket cylinder 700 will be described.

The user manually operates the scale dial 901.
Can be rotated to the desired scale value. When the user rotates the scale dial 901 in a clockwise direction (the direction of arrow A in FIG. 2), the helical gear 909 rotates integrally with the scale dial 901 via the handle shaft 902 and the shaft 908, and the rotational force is reduced. Helical gear 9
09 to the helical gear 911. When the helical gear 911 rotates, the helical gear 912 rotates integrally with the helical gear 911 via the shaft 910, and the rotational force is transmitted to the helical gear 914 via the helical gear 912. Is transmitted. When the helical gear 914 rotates, the shaft 913 rotates, and the arm 919 screwed to the threaded portion 913a of the shaft 913 via the female screw portion 919b moves relatively upward with respect to the shaft 913 in FIG. . Then, the arm 9 is moved through the pin 920.
The arm 961 and the arm 971 connected to 19 move at the same time to the position shown by the two-dot chain line in FIG.

When the arm 961 moves to the position shown by the two-dot chain line in FIG. 2, the L-shaped arm 963 moves to the stud 964.
2 in a clockwise direction in FIG.
36 moves to the lower left of FIG. When the pin 636 moves, the arm 635 and the pin 63 are integrated with the pin 636.
4. The arm 633 and the pin 632 move in the lower left direction in FIG. 2, and the barrel insertion arm 631 rotates integrally with the blanket cylinder shaft 601 counterclockwise in FIG. 2 around the rotation center 601A of the blanket cylinder shaft 601. I do. Thus, the rotation center 600A of the blanket cylinder 600 supported by the blanket cylinder shaft 601 is
2, the center of rotation 600A of the blanket cylinder 600 moves substantially to the right in FIG. Thus, the rotation center 6 of the blanket cylinder 600
00A moves away from the rotation center 400A of the impression cylinder 400.

When the arm 971 is moved to the position indicated by the two-dot line in FIG. 2, the L-shaped arm 973 is rotated around the stud 974 in the counterclockwise direction in FIG. Moves in the lower right direction of FIG. Pin 736
Is moved, the arm 735, together with the pin 736,
The pin 734, the arm 733, and the pin 732 move to the lower right direction in FIG. 2, and the barrel insertion arm 731 is integrated with the blanket cylinder shaft 701 about the rotation center 701A of the blanket cylinder shaft 701 in FIG.
Rotate clockwise. Accordingly, the center of rotation 700A of the blanket cylinder 700 supported by the blanket cylinder shaft 701 moves clockwise in FIG. 2 around the center of rotation 701A of the blanket cylinder shaft 701. Move almost to the left of. Thus, the rotation center 700A of the blanket cylinder 700 moves away from the rotation center 400A of the impression cylinder 400.

On the other hand, when the user rotates the scale dial 901 in the counterclockwise direction (the reverse direction of the arrow A in FIG. 2), the operation is the reverse of the above operation, and the rotation center 6 of the blanket cylinder 600 is rotated.
00A approaches the rotation center 400A of the impression cylinder 400, and the rotation center 700A of the blanket cylinder 700 approaches the rotation center 400A of the impression cylinder 400 at the same time, and the movement distance is also equal.

When the paper pressure is adjusted by the scale dial mechanism 900, the blanket cylinder / plate cylinder body inserting means 61 is used.
0, 710 and blanket and impression cylinder inserting means 630, 730
Accordingly, the blanket cylinder 600 and the plate cylinder 811 and the impression cylinder 400 must be in contact with each other, and the blanket cylinder 700 and the plate cylinder 812 and the impression cylinder 400 must be in contact with each other. Depending on the paper thickness, blanket cylinders 600, 7
This is because adjusting the contact pressure between 00 and the impression cylinder 400 is based on the premise that they are in contact with each other.

[0058] The offset printing press according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, the outer circumference of each blanket cylinder and plate cylinder is divided into two plate regions or color regions, but may be one plate region or color region, and various division numbers such as three are possible. It is. In this embodiment, two blanket cylinders and two plate cylinders are provided for one impression cylinder. However, any number of blanket cylinders and plate cylinders provided for one impression cylinder can be used. Good.

In this embodiment, since both blanket cylinders are arranged symmetrically with respect to the impression cylinder, the members constituting the blanket cylinder / press cylinder insertion means are also arranged symmetrically. However, even when both blanket cylinders are arranged asymmetrically across the impression cylinder, the position of the studs 964, 974 or the shape of the arms 963, 973 is changed, and
By adjusting the length of 1, 971, the operation unit 90
With one operation, the axes of both blanket cylinders can be simultaneously moved by the same distance. Although the operation of the operation unit 901 is described as a manual operation in the present embodiment, it is also possible to drive a motor by bringing a motor driving source into contact therewith.

[0060]

According to the first aspect of the present invention, since the paper thickness adjusting mechanism moves the rotation axes of the two or more blanket cylinders simultaneously and at the same distance, the apparatus can be downsized. In addition, the work required for adjusting the paper thickness is simplified.

According to the second aspect of the present invention, there is provided a specific configuration capable of simplifying the operation required for adjusting the paper thickness and reducing the size of the apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an offset printing press according to an embodiment of the present invention.

FIG. 2 is a side view showing a blanket cylinder / plate cylinder body insertion unit, a blanket cylinder / press cylinder body insertion unit, and a scale dial mechanism of the offset printing press according to the embodiment of the present invention.

FIG. 3 is a side view showing the blanket cylinder / plate cylinder body inserting means of the offset printing press according to the embodiment of the present invention as viewed from the side opposite to FIG.

FIG. 4 is a cross-sectional view of a main part showing a blanket cylinder / plate cylinder body inserting unit and a blanket cylinder / press cylinder body inserting unit of the offset printing press according to the embodiment of the present invention.

FIG. 5 is an essential part cross-sectional view showing a scale dial mechanism of the offset printing press according to the embodiment of the present invention.

[Explanation of symbols]

3a, 3b frame 400 impression cylinder 400A impression cylinder axis 600, 700 blanket cylinder 600A, 700A blanket cylinder axis 601, 701 blanket cylinder axis 601A, 701A rotation center of blanket cylinder axis 630, 730 blanket cylinder / impression cylinder Inserting means (paper thickness adjusting mechanism) 900 Scale dial mechanism (operation section and interlocking mechanism) 901 Scale dial (operation section) 902 Handle shaft (conversion mechanism) 908, 910, 913 Shaft (conversion mechanism) 909, 911, 912, 914 Helical gear (conversion mechanism) 919 Arm (conversion mechanism) 961, 971 Arm (link mechanism) 963, 973 Arm (link mechanism)

Claims (2)

[Claims] A frame forming an outer periphery of the apparatus, an ink image formed on an outer periphery of the frame, at least two blanket cylinders rotatably provided on the frame; An impression cylinder for transferring the ink image of each of the blanket cylinders onto the sheet while carrying the paper cylinder thereon, and a paper thickness adjustment for adjusting a distance between the axis of the blanket cylinder and the axis of the impression cylinder. In an offset printing press provided with a mechanism, the paper thickness adjustment mechanism is connected to a single operation unit, the single operation unit, and connected to the two or more blanket cylinders, An offset printing press, comprising: an interlocking mechanism for simultaneously moving the axes of the two or more blanket cylinders by an equal distance by a driving force by an operation. 2. Each blanket cylinder is rotatably supported by a blanket cylinder shaft rotatably supported by the frame, and the rotation axis of the blanket cylinder shaft is eccentrically arranged with respect to the axis of the blanket cylinder. The rotation of the blanket cylinder shaft forms a structure in which the axis of the blanket cylinder moves in the radial direction. The operation unit forms a rotation operation unit to generate a rotational driving force. A conversion mechanism for converting the rotational movement of the operation unit into a linear movement, and a link mechanism connected to the conversion mechanism, the link mechanism is connected to each of the blanket cylinder shafts,
2. The offset printing press according to claim 1, wherein the linear motion of the conversion mechanism is converted into a rotary motion of the blanket cylinder shaft.