JPH0443508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention is a basic unit of offset printing, in which a cylinder for spot color (replenishment) printing is attached to the B-B type cylinder arrangement. The present invention relates to an apparatus capable of partially additionally printing one more color on a monochrome printed web or a single-sided two-color printed web.

(b) Prior Art In offset printing units, the cylinder arrangement often used as a basic type and also incorporated in various applied variants is the B-B type, ie, a pair of blanket cylinders each with a cooperating plate cylinder. These are mutual contact type, and the web passing between them is subjected to simultaneous single-color printing on both sides. Here, monochromatic printing is also referred to as sumi printing. In addition, the above-mentioned B-B type can perform two-color printing on one side of the web (direct printing for one color) by using one of the blanket cylinders as an impression cylinder.

By the way, the pair of blanket cylinders incorporated in this B-B type printing unit have conventionally been used for cylinder relief (also known as trip or impression).
It is well known to involve a mechanism for displacing the plate cylinders from their mutually contacting position to a neutral position where they are spaced apart from each other and away from their respective cooperating plate cylinders, also known as throw-offs.

However, with the above-mentioned B-B type printing unit, printing on the web is limited to single-color printing on both sides or two-color printing on one side. Therefore, for example, in addition to single-color printing on both sides, it is desired to print one additional color locally on one side of the web. A modified B-B type was proposed and became well known. This modified type is called the B-B type with a spot color, a reprinting device, or a color deck.

However, the conventional B-B type printing unit with spot color deck is a dedicated type in which the third plate cylinder contacts only one of the blanket cylinders, so reprinting can only be done on one side of the web. The freedom of choice to add reprints to the other side was not available.

In contrast, U.S. Patent No. 4,526,099
By making the axes of both blanket cylinders in the B-type printing unit selectively movable in the same direction, and by providing the third printing cylinder at an intermediate position between the two blanket cylinders, A B-B type printing unit with a spot color deck for both left and right use has been proposed in which either cylinder can selectively contact a third printing cylinder.

(c) Problems to be Solved by the Invention In this known left-right and left-handed printing cylinder, the two blanket cylinders are displaced to bring one of them into contact with the third printing cylinder, and the blankets also come into contact with each other. Therefore, it is unreasonable that one of the two blanket cylinders is in contact with the third printing cylinder even when spot color printing is not performed.

In addition, when the spot collar deck section is attached to a B-B type unit, it is necessary to replace the cylinder relief displacement mechanism of the pair of blanket cylinders, which is a main part of the B-B type unit, with a completely new one.

However, as mentioned above, the B-B type unit is a sophisticated basic type that is widely used in offset printing, is incorporated into other modified units, is produced in large numbers, and is highly compatible. It is not preferable to specially transform the main parts of the equipment when it is used as an accessory, and the modification should be realized within the scope of the equipment itself. In this way, it will be possible to deal with design changes midway, additions, removals, and replacements after installation quickly, easily, and at low cost.

The first object of this invention is to enable selective reprinting on one side of the web in addition to single-color printing on both sides;
In addition, it can be used as a B-B type printing unit for double-sided single-color printing, and is a left-right dual-use type in which both of the two blanket cylinders can be separated from the third printing cylinder when used as a B-B type printing unit. To provide a B-B type printing unit with a spot color deck.

The second object of this invention is that the equipment unit to be added can complete its displacement operation within its own range, and the mechanisms inherent in the B-B type unit to be added must not be modified in any way. To provide a BB type printing unit with a spot color deck for both left and right use, which is easy to add, remove, and replace, is simple, and is inexpensive, in which the combination of both is achieved without the need for .

(d) Means for solving the problem The present invention has a conventionally known body relief mechanism,
B consisting of a pair of plate cylinders and a pair of blanket cylinders
- In the B-type printing unit, the printing cylinder is provided at a position substantially corresponding to the apex of a triangle in relation to the pair of plate cylinders, and the pair of blanket cylinders are located within the triangle. , further comprising a first printing cylinder which contacts only one of the blanket cylinders when the pair of blanket cylinders contact each other;
Single eccentric mounting means for displacing between a contact position, a neutral position where the blanket cylinders are not in contact with any of the blanket cylinders, and a second contact position where the blanket cylinders are in contact with only the other blanket cylinder when the pair of blanket cylinders are in mutual contact. The above objectives were achieved by providing the following.

(e) Effect When the pair of blanket cylinders in the B-B type printing unit are in the mutual contact position, the eccentric mounting means for the printing cylinders is actuated to move the printing cylinders to the first contact position. , spot color printing can be added to one side of a double-sided single-color web.

Further spot color printing can be applied to the other side of the double-sided monochrome web by actuating the printing cylinder eccentric mounting means to move the printing cylinder to the second contact position.

By activating the eccentric mounting means for the printing cylinder and moving the printing cylinder to a neutral position, only double-sided monochrome printing can be performed.

When it is desired to release a pair of blanket cylinders in a B-B type printing unit, first operate the printing cylinder eccentric mounting means to move the printing cylinders to a non-contact neutral position, and then By operating a well-known cylinder release displacement mechanism on the blanket cylinder, the printing cylinder and the pair of blanket cylinders are brought into a non-contact state.

(f) Embodiment The embodiments shown in FIGS. 1 and 3 are the same in that a conventionally well-known B-B type printing unit 1 is provided, but the printing cylinder equipped on the spot color deck 2 is The difference is that in FIG. 1 only a forme cylinder 21 is provided, whereas in FIG. 3 a blanket cylinder 22 with a cooperating forme cylinder 21 is provided.

As is well known, the B-B type printing unit 1 is a four-cylinder articulated type in which a pair of blanket cylinders 11 and 12 are accompanied by cooperating plate cylinders 13 and 14, respectively.
By passing the web 3 from the solid line W position between a pair of blanket cylinders 11 and 12 that are in contact with each other, monochrome printing (black printing) is printed on both sides of the web 3,
Also, move the web 3 from the dotted line X1, X2 position to the body 1.
Pass between 1 and 13 or between 12 and 14 respectively,
Furthermore, by passing it between the cylinders 11 and 12, two-color printing is printed on one side of the cylinder. Furthermore, the B-B type printing unit 1 includes a pair of blanket cylinders 11, 1.
2 are allowed to move simultaneously in opposing (opposite) directions between a mutually contacting position (indicated by a solid line) and a body release position (indicated by a two-dot chain line) in which they are separated from each other. Single eccentric mounting means (not shown) supporting each axial end of the blanket body
It is also well known that

In the present invention, without making any modification to the mechanism of such a conventionally well-known B-B type printing unit, a spot color deck for both left and right use is attached to it, and the web 3 is normally printed as shown in FIGS. 2A and 2B. 4A and B, and if necessary, as shown in FIGS. 2C and D and 4C and D, to place one more color spot on the desired side of the web 3. We also aim to be able to print in color.

Plate cylinder 2 for spot color printing in Figure 1
Blanket cylinders 1 and 22 for spot color printing in FIG. The pair of blanket cylinders 11, 12 are positioned therein.

The plate cylinder 21 or the blanket cylinder 22 can be moved to a first contact position in which it contacts the left blanket cylinder 11 in the figure, provided that the pair of blanket cylinders 11, 12 are in a mutual contact position, It can also be moved to a second contact position where it contacts the blanket cylinder 12 on the right side in the figure. However, the rotation of the cylinder 21 or 22 at the two contact positions is in opposite directions, and the reversal can be easily achieved by a drive system (not shown).

Furthermore, the body 21 or 22 is connected to the first and second bodies.
In the middle of contact, the blanket cylinders 11 and 12 can be positioned at a neutral position where they are not in contact with each other, and the pair of blanket cylinders 11 and 1
The second barrel release displacement is activated on the premise that the barrel 21 or 22 is in the neutral position. The interlocking means can be easily achieved by inputting a signal from an electric sensor or a limit switch.

5 to 7 illustrate the eccentric mounting means of the embodiment shown in FIG.
FIG. 5 shows the state of each part at the first contact position, FIG. 6 the neutral position, and FIG. 7 the state of each part at the second contact position.

Note that the eccentric mounting means of the embodiment shown in FIG.
The remaining structure that eliminates the need for the link and lever between the plate cylinder 21 and the plate cylinder 21 in FIGS. 5 to 7 is sufficient, and
In the following text, "blanket cylinder 22" is replaced with "plate cylinder 2".
1" and delete "plate cylinder 21" and read it again, so illustrations and explanations will be omitted.

In FIGS. 5 to 7, the first eccentric sleeve 4
is a shaft 221 at the end surface of the blanket body 22.
An arm 41 projects radially from the sleeve, and the free end of the arm is connected to the free end of the first lever part 43 of the bell crank lever via a link 42. connected.

On the other hand, the second eccentric sleeve 5
The arm 51 is rotatably fitted between the sleeve 1 and the shaft 211 at the end surface of the arm 51.
is provided protrudingly, and the free end of the arm is connected to a link 52.
The second lever part 53 of the bell crank lever via
connected to the free end of.

Further, the bell crank lever having the first and second lever parts 43 and 53 has its center part fixed to the shaft 6 by, for example, a key, and one end part of the shaft 6 is rotatably inserted into the frame 23. It protrudes behind it, and the other end is rotatably supported by a frame (not shown) facing the frame 23. Furthermore, a bifurcated arm 7 is fixed to one end of the shaft 6 projecting behind the frame 23, for example, by a key. The arm 7 includes a first arm 71 and a second arm 7
A guide pin 73 is provided between the free ends of each arm and is rotatably lockable and has a male threaded portion on the outer periphery. The male threaded portion of the guide pin 73 may be provided over the entire length, or may be provided for an appropriate length on both ends, and the other portions may have a smaller diameter than the male threaded root.

Fluid actuator, e.g. air cylinder 8
is a slider block 83 whose tail end is rotatably attached to the back surface of the frame 23 by a pin 81, and the tip of a rod 82 protruding from its free end engages with the male threaded portion of the guide pin 73. is connected to.

In such a configuration, as shown in FIG.
Since the bifurcated arm 7 and the bell crank levers 43, 53 rotate together with the shaft 6 and are angularly displaced in the direction of the hour hand, each eccentric sleeve 4
and 5 via links 42 and 52, respectively,
Blanket cylinder 22, on the one hand, is in contact with left-hand blanket cylinder 11 so that a spot color can be printed, since both are positioned in a counterclockwise angular displacement position.

Next, in FIG. 6, the rod 82 extends from the air cylinder 8 and angularly displaces the bifurcated arm 7 and the bell crank levers 43, 53 in the counterclockwise direction. are both angularly displaced in the direction of the hour hand, and thus, at the same time that blanket cylinder 22 separates from both of the pair of blanket cylinders 11 and 12, plate cylinder 21 also separates from the blanket cylinder. If printing is carried out by passing the web between the blanket cylinders 11 and 12 in this state, only double-sided monochrome printing will be performed. Also, under this condition, a well-known cylinder release displacement mechanism (not shown) of the B-B type printing unit is operated to reduce the distance between the pair of blanket cylinders.
Execute from the position shown by the broken line to the position shown by the two-dot chain line.

Furthermore, in FIG. 7, the slider block 83 at the tip of the extended rod 82 is moved on the guide pin 73 and displaced toward the second arm 72, and in this state, the rod 82 is pulled into the cylinder 8. As a result, the bifurcated arm 7 and the bell crank levers 43, 53 rotate together with the shaft 6 and are angularly displaced in the direction of the hour hand. The sleeve 5 is angularly displaced counterclockwise, so that the blanket cylinder 22 is in contact with the right-hand blanket cylinder 12 on the one hand and a spot color can be printed.

Although the links 42 and 52 are shown as one body in FIGS. 5 to 7 to avoid cluttering the drawings, it is of course possible to provide a well-known length adjustment means such as a screw mechanism in the intermediate portion. be.

Further, the present invention is not limited to what is shown in the examples, but includes modifications of the design within a range that does not depart from the spirit of the invention.

(g) Effect of the invention As detailed above, the present invention improves the existing B-
Without changing the configuration of the B-type printing unit 1 in any way, the third printing cylinder 21 (FIG. 1) or 22 (FIGS. 3 to 7) can be connected to a pair of blankets by using only the attached deck 2. It is possible to selectively contact both the shells 11 and 12 (the fifth
(Fig. 7), in the case of double-sided single-color printing only,
In addition, in consideration of cylinder release displacement, it is also possible to position the third printing cylinder 22 at a position where it does not come into contact with any of the cylinders 11, 12, and 21 (FIG. 6).

Therefore, according to the present invention, it is possible to normally print only double-sided single-color printing using the B-B type printing unit, and selective reprinting on one side can be added using the left-right and left-hand spot color deck. It became like that.

Furthermore, since the spot color deck for both left and right use can be made into a unit, it has become possible to quickly and easily handle design changes during the process, additions, removals, and replacements after installation at low cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic layout diagram of each cylinder for explaining the first embodiment of the present invention, FIGS. 2A to D are explanatory diagrams showing an example of paper threading in the first embodiment, and FIG.
4A to 4D are explanatory diagrams showing an example of paper threading in the second embodiment, and FIG. 5 is a schematic layout diagram of each cylinder for explaining the second embodiment of the present invention. 1
6 is a schematic view of the main part showing the state of the displacement mechanism in the contact position, FIG. 6 is a schematic diagram of the main part showing the state of the displacement mechanism in the body release (neutral) position of FIG. FIG. 6 is a schematic view of the main parts showing the state of the displacement mechanism at the second contact position shown in the figure. 1... B-B type printing unit, 11 and 12...
... Blanket cylinder, 13 and 14 ... Plate cylinder, 15
...Frame, 2...Spot color deck, 2
1... Plate cylinder, 211... Its axis, 22... Blanket cylinder, 221... Its axis, 23... Frame, 3... Web, W, X1, X2... Web insertion direction, Y1, Y2... Web unloading direction, 4...
First eccentric sleeve, 41... Arm, 42... Link, 43... First lever portion, 5... Second eccentric sleeve, 51... Arm, 52... Link, 53
... second lever part, 6 ... shaft, 7 ... bifurcated arm, 71 ... first arm, 72 ... second arm,
73...Guide pin, 8...Air cylinder, 81
...pin, 82...rod, 83...slider block.

Claims (1)

[Scope of Claims] 1. A pair of blanket cylinders each having a plate cylinder that cooperates with each other, and simultaneously facing each other between a position where the pair of blanket cylinders contact each other and a cylinder release position where they are separated from each other. a single eccentric mounting means for supporting each axial end of said pair of blanket cylinders so as to permit movement in (opposite) directions; a printing cylinder provided at a position substantially corresponding to the apex of a triangle formed by the relationship, and provided so that the pair of blanket cylinders are located within the triangle; a first contact position in which the blanket cylinders are in contact with one of the blanket cylinders when the pair of blanket cylinders are in mutual contact; a neutral position in which the blanket cylinders are not in contact with any of the blanket cylinders; and a second contact position in which the blanket cylinders are in contact with one of the blanket cylinders when the pair of blanket cylinders are in contact with each other; single eccentric mounting means for supporting the axial end of said printing cylinder so as to be allowed to move between said printing cylinder and a second contact position in contact with said printing cylinder; . 2. The spot color deck according to claim 1, which uses a plate cylinder as the printing cylinder. 3. The single eccentric mounting means for the plate cylinder includes: an eccentric sleeve attached to the shaft end of the plate cylinder so as to be freely rotatable; a lever connected to the sleeve via a link; and an angular displacement operation for the lever. 3. A spot collar deck according to claim 2, comprising: a fluid actuator operably attached thereto; 4. A spot color deck according to claim 1, which uses a blanket cylinder with a cooperating plate cylinder as the printing cylinder. 5. The single eccentric mounting means of the blanket cylinder is connected to each eccentric sleeve rotatably attached to each shaft end of the blanket cylinder and the cooperating plate cylinder through a link, respectively. 5. The spot collar deck according to claim 4, comprising: a bell crank lever; and a fluid actuator attached to the lever so that the lever can be operated for angular displacement.