JPS6064849A - 4-color offset perfect printing machine - Google Patents

Abstract

PURPOSE:To enable a 4-color offset perfect printing via one-time passage without inversion of sheets by forming printing units of cylinder array without middle cylinder and feeding sheets to be supplied from lower to upper and hence vertically. CONSTITUTION:4 sets of printing units A-D are provided, and the units A and C are a plate cylinder 2 and a rubber cylinder 2 disposed at the left side of a pressure cylinder 3 are disposed in the same state. The units B and D are its plate cylinder 1 and a rubber cylinder 2 disposed at the right side of a pressure cylinder 3 freely. The free units are alternately connected in such a manner that the pressure cylinders 3 are disposed in a zigzag state, and gathered integrally, thereby forming 4-color perfect printing cylinder array. Sheets are supplied by a supply unit E to the cylinder 3 disposed at the lowermost position of the units, fed upwardly to a sheet exhaust unit F, and are printed in 4 colors on both sides during passage of this route.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a double-sided multicolor offset printing machine, which allows four-color offset printing to be performed on both the front and back sides of a sheet by passing it once. This relates to the provision of printing machines that can.

[Technical background of the invention and its problems]

A double-sided offset printing press is used to perform offset printing on both the front and back sides of a sheet in one pass. There have been various types of double-sided printing machines of this type, and the following are known as representative ones.

That is, there are those that can be printed in multiple colors on the front side and single color on the back side, those that can be printed in single color on both the front and back, and those that can be printed in multiple colors on both the front and back sides. Some of these machines are originally designed as double-sided printing machines, and others are normally used as single-sided multicolor printing machines, but they can be switched to double-sided paper printing machines if necessary. There are things etc.

One example of the former type is that described in Japanese Patent Publication No. 86801/1983. This publication discloses a type that can print two colors on the front side and one color on the back side in one pass, and a type that can print single color on both sides at the same time.

These are the so-called B-B types, and 2
A paper gripper is attached to one of the book's rubber cylinders, and the paper sheet is gripped by this rubber grip, and as it passes between the two rubber cylinders, both the front and back sides are printed at the same time. In addition, as disclosed in the same publication, the above-mentioned surface capable of performing two-color printing is printed via a separately provided single-color printing unit (k) and three intermediate cylinders. It is connected to a B type printing unit.

I have yet to see an example of the above-mentioned B-B type that can be printed in multiple colors on both sides of a sheet, but if such a device were to be constructed, multiple B-B Type printing units) are lined up one by one, and are connected with at least three intermediate cylinders in between. (With one intermediate cylinder, even if a double cylinder is used, the customer printing unit is (There is not enough space between them for the work.) Therefore, printing presses inevitably become larger, and the number of intermediate cylinders is large.
This increases the number of paper changes, leading to a decrease in registration accuracy.

Next, considering what can be converted to a normal multi-color offset printing machine and a full-sided printing machine, this type of printing machine is a single-color printing unit consisting of three cylinders: a plate cylinder, a blanket cylinder, and an impression cylinder. -It is connected by 13 intermediate cylinders (often seen in so-called tandem type multi-color printing presses).

Tandem printing machines have three intermediate cylinders as mentioned above, but machines that can be used for double-sided printing are equipped with a sheet reversing device on these intermediate cylinders, and can be used for double-sided printing by switching operations. It can be used for other purposes. In this case, the front side of the sheet is first printed as usual in the front printing unit for front side printing, but this sheet is sent to the rear printing unit via the intermediate cylinder equipped with the reversing device. When the sheet is turned, the sheet is turned over by the action of the turning device so that the trailing edge of the sheet now leads.

Therefore, in the subsequent printing unit, the back side of the sheet is printed.

Some of those having the above configuration are described in Japanese Patent Publication No. 52-97802, Japanese Patent Publication No. 52-138211, Japanese Patent Publication No. 79607-1987, Japanese Patent Publication No. 53-149404, and the like. As can be seen in the above-mentioned publication, all of the reversing devices have complicated mechanisms, and the adjustment at the time of switching is complicated, and the complexity increases as the size of the sheet to be printed changes, and at the same time, the printing is not possible. There are also mechanical limitations on the sheet size. The fact that the three intermediate cylinders are located between each printing unit increases the size of the machine even more than the one using the BB type unit described above. In other words, if double-sided four-color printing is to be performed in one pass, the above-mentioned B-B type can be achieved with four units, but with this type, twice as many printing units are required, and eight-color fill is required. I'm jealous of both sides of 11 mark 1dll.
I t) Hiroshi τ ← 1 i has to go out of the way. Of course, if the tandem type printing machine Q' is also used as a double-sided printing machine, since its main purpose is single-sided multicolor printing, it has certain advantages in terms of versatility. However, since it is not designed exclusively for double-sided printing, we cannot expect much from this type of printer in terms of compactness or paper storage.

[Purpose of the invention]

The present invention was proposed under the above circumstances, and aims to provide a compact and inexpensive printing press that is capable of double-sided, four-color offset printing without reversing the paper. purpose.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention forms a cylinder arrangement printing unit without an intermediate cylinder, and the sheets fed by the paper feeder are transported upwardly from below, that is, vertically. It is designed to be compact and compact.

That is, four sets of five-cylinder printing units are provided, each consisting of five cylinders: two plate cylinders and two blanket cylinders with the same diameter, and one common impression cylinder with a diameter three times the diameter of these cylinders. The above-mentioned five-cylinder printing unit has a configuration in which the plate cylinders and blanket cylinders are arranged horizontally and are arranged in two stages, upper and lower, with a full interval between them, and an impression cylinder is connected to both the upper and lower blanket cylinders. Moreover, two out of the four sets each have different left and right hands.

The opposite printing units are connected alternately and in such a way that their impression cylinders form a vertical zigzag pattern, and are integrated into one unit, thereby forming a four-color double-sided printing unit as a whole. Further, the impression cylinder located at the lowermost part of the printing section includes a paper feeding device for supplying sheets of paper.
It is characterized in that a paper discharge device is connected to the uppermost impression cylinder.

[Embodiments of the invention]

The accompanying drawings are schematic side views showing essential parts of the present invention,
One example is shown below.

In the drawings, the number 1 indicates eight plate cylinders, and the number 2 indicates eight rubber side notes. The plate cylinder 1 and the blanket cylinder 2 have the same diameter. Two pairs of the plate cylinder 1 and the blanket cylinder 2 are arranged horizontally to form one set. 3 indicates four impression cylinders.

Note that the impression cylinder is provided with gripping claws (not shown) at three equal positions on the curved surface. The two pairs of plate cylinders and blanket cylinders are arranged at intervals, and the impression cylinder 3 is connected to them as a common impression cylinder, and these five cylinders constitute a two-color printing unit. The printing units of 11σ are A, B, C, and D.
There are four sets of printing units A and C, in which the plate cylinder 1 and blanket cylinder 2 are arranged on the left side with respect to the impression cylinder 3, and are in the same manner. In addition, printing unit) B and printing unit)
D has the plate cylinder 1 and the rubber A82 on the right side of the impression cylinder 3, and has the same structure as that of the above embodiment, but is placed on the opposite side.

As clearly shown in the drawing, each of the different printing units is arranged alternately, and the three impression cylinders are connected in a zigzag pattern and combined into one unit, forming a printing section side arrangement for double-sided four-color printing. has been done.

E is an example of a paper feeding device and has the following configuration. 4 is a well-known i-sheet feeder, and 5 is a sheet stacked in the feeder. 6 is an abbreviation of the well-known swing gripper mechanism. This swing gripper 6 is for delivering sheets fed by the feeder 4 and stopped on the paper feed plate 7 to the rotating paper feed cylinder 8 while making a reciprocating circular arc motion.

Reference numerals 9, 10, and 11 are similar to the above-mentioned abbreviation of a known chain conveyance mechanism, and at the point of contact with the paper feed cylinder 8, sheets held by grippers of the paper feed cylinder 8 (not shown) are Chi =
It is configured such that it is gripped by a gripping claw (not shown) attached to the cylinder, and is accurately delivered to the impression cylinder 3 at the lowest position in the printing section. In addition, the above 9 and 10 are sprockets for driving the Y-1711, which are formed to have a diameter twice that of the plate cylinder. show.

F is a complete abbreviation of the paper discharge device, which is a well-known chain delivery device. 12 is a chain equipped with a known gripping claw (not shown), and 13 is a sprocket. Further, numeral 14 indicates printed sheets which are ejected by the ejecting device and piled up.

Since the present invention has the above-described configuration, the sheet is supplied to the impression cylinder 3 at the lowest position in the printing section by the paper feeder E, and follows the path shown by the thick line in the direction of the arrow from impression cylinder to impression cylinder. The sheet is gripped by gripping claws (not shown), transported upward, and sent to the sheet discharging device F. While the sheet follows this path, it is printed in four colors on both sides. That is,
When the sheet of paper held by the gripper (not shown) of the impression cylinder 3 of printing unit A passes between the two rubber pieces 2.2,
A two-color image is pressed from the blanket cylinder onto the surface of the sheet. Then, the impression cylinder 3 of the next printing unit) B from printing unit) A
The sheet of paper that has been picked up is now placed on the impression cylinder 3 with its printing surface
When the sheet is inverted so that it is in contact with the circumferential surface and is held in the gripping claw where the back side is not printed in two colors as described above, the front and back sides of the sheet are printed in four colors each. is applied.

To explain the configuration of the present invention shown in the attached drawings using more specific numbers, the size of the sheet to be printed is
For example, when performing the process on a relatively small paper size such as Kikuhanjubi (469j01 Combined with the arrangement, it is convenient because it can be housed at a height that does not interfere with normal company buildings. By the way, when targeting the Kikuhan trial, the diameters of the printing cylinder and rubber cylinder were set to zoom5.
Suppose that it is set to g. If, as shown in the attached drawing, the angle (cylinder angle) α formed by the plate, rubber, and press cylinder is set to around 142°, and furthermore, the distance between the centers of each plate cylinder is set to be equal, The total height of the machine, including the bed, can be kept at around 2.6 m, making it possible to provide a compact machine that can be used even in small factory buildings. Also,
With the above configuration, the distance between the circumferential surfaces of the plate cylinders is approximately 3Qz, so there is no problem with the work.

Next, to add an additional note about the body attachment/detachment mechanism (so-called body release), when the diameter of the body is 200M da as in the previous example, the winding angle (when 4696 lengths of paper are wrapped around the circumferential surface of the body) The angle formed when connecting the end of the arc and the center of the torso is approximately 2700. As in this example, when the winding angle is large (and the cylinder angle is as large as 142 degrees, one cylinder relief), multiple eccentric bearings are used to support the rubber cylinder, and each eccentric bearing is rotated at a predetermined timing. The rubber cylinder can be attached and detached from the printing cylinder and the impression cylinder individually by rotating the cylinder.
There is no risk of producing waste paper.
(See Publication No. 4).

Although the embodiments have been described in detail above, the present invention is not limited to the barrel diameter of the above-mentioned embodiments, and the diameter of the barrel can be arbitrarily selected, and the target printing paper size is also limited to Kikuhanji. It's not something that should be done.

In addition, in the part shown by the two-dot chain line in the figure, 15 is a frame of the main body of the printing press. Reference numeral 16 denotes an inking frame in which an inking section (not shown) is installed. Further, a dampening water device is installed below each plate cylinder, but is not shown.

Also, 18 is a paper feed frame, 19 is a bed, 20
Shows Delino Ryu Reframe, etc.

[Other Examples]

In the embodiment shown in the accompanying drawings, the vertical center-to-center distances a, b, and c of each impression cylinder 3 are formed at equal intervals, and furthermore, the center-to-center distances of each plate cylinder are equal on both the L side shown in the figure and the L side. Although the rubber cylinders are shown arranged so that the distance and the distance between the rubber cylinder centers are the same, this is preferable because the eccentric bearing of the rubber cylinder and various other members can be used as a common member. However, the present invention is not limited to this. (Taking the distances e and f between the plate cylinder centers on the side shown in the figure as an example, the distance between the plate cylinder centers f and the distance between each printing unit The distance e between the plate cylinder centers formed in the above embodiments is not necessarily the same (also, the distance between the blanket cylinders may be somewhat wider than the distance between the plate cylinders, that is, the cylinder angle may be formed smaller than that of the example). .

〔Effect of the invention〕

Since the present invention does not use any intermediate cylinders, the number of cylinders is significantly smaller than in similar double-sided, four-color offset printing presses (and, moreover, the fed sheets are transported upwards rather than downwards). Since there is no structure, it can be provided very compactly.Furthermore, since the configuration of the four sets of five-cylinder printing units is the same, parts can be shared, and it can be done at a low cost.In addition, each impression cylinder can be arranged in a zigzag pattern. This is advantageous because it allows a lot of time for each printed sheet to start the next printing.

[Brief explanation of the drawing]

The accompanying drawing is a general side view schematic view of a four-color sheet-fed offset printing press according to the present invention, and shows one embodiment thereof. 1-...Print cylinder, 2...Rubber cylinder, 3
・・・－・・・－・Impression cylinder, A. B: 5-cylinder printing unit in the same manner, C
,D...--A 5-cylinder printing unit with left and right sides of feed registers A and B on opposite sides.

Claims (1)

[Claims] Two pairs of plate cylinders and blanket cylinders of equal diameter are arranged horizontally in two stages, upper and lower, with a gap between them, and three
It is a five-cylinder printing unit constructed by connecting double-diameter impression cylinders to both the upper and lower blanket cylinders, and two sets each of left and right hand printing units are provided, and the printing units are arranged alternately. In addition, the impression cylinders are connected in a vertical zigzag shape and are integrated, forming a double-sided four-color printing section as a whole, and the impression cylinder located at the bottom of this printing section has a A double-sided, four-color offset printing machine that includes a paper feeding device for feeding sheets, and a paper discharging device connected to the uppermost impression cylinder.