JPH088103Y2 - Common water flow device for offset printing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an offset printing machine having an inking device, a dampening water device and a dampening water cooling circulation unit for normal plate printing, and more particularly, For waterless lithographic printing, using the water supply device and dampening water cooling circulation unit as they are,
The present invention relates to a common water-flowing device for cooling ink by passing water from a water boat to an ink roller through a cooling water pipe.

(Background of the Invention) Since offset printing basically utilizes the repulsion between oil-based ink and water, in the case of ordinary plate printing, there are chemical and non-image areas due to chemical treatment. It is necessary to supply the ink and the dampening water to the plate surface divided into two parts. Therefore, the inking device and the dampening water device are provided in association with the plate cylinder.

The inking device takes out the ink stored in the ink fountain with a doctor roller, kneads it with a large number of ink roller groups, guides it to an inking roller, and deposits the ink on the plate surface.

In addition, the dampening water device temporarily stores the dampening water (actually containing various chemical compounds) kept at a predetermined temperature by the dampening water cooling circulation unit in a water boat. The dampening water is supplied from the boat to the printing plate after the dampening water is evenly guided in a thin film form to the watering roller via the water source roller and the like. In addition, as the configuration type of the roller group of the dampening water device,
There are an intermittent type that connects the water source roller and the plate cylinder side roller by a calling roller that makes an oscillating motion, and a continuous type that is directly connected by a group of rollers that make mutual contact between the water boat and the plate surface. The invention is equally applicable to both formats.

Then, the ink and the dampening water are supplied to the normal printing plate such as the PS plate by the inking device, the dampening water device, and the dampening water cooling circulation unit, and the offset printing is performed.

By the way, recently, in addition to printing with the above-mentioned normal printing plate,
Printing by waterless lithographic printing that does not require dampening water is being put to practical use. This waterless planographic printing plate has a non-printing area with a silicone rubber layer that repels the ink without dampening water, as well as a printing area that exposes the aluminum surface that is the substrate and adheres the ink. Emphasis is placed on convenience that does not require water.

However, in printing with a waterless flat plate, it is necessary to cool the ink below room temperature in order to improve and stabilize the printing quality. For this purpose, the ink is transferred and kneaded into a uniform film. Cooling via an ink roller is an effective means.

Needless to say, it is preferable that one offset printing machine can be commonly used for printing a normal printing plate and a waterless planographic printing plate.

(Prior Art) A technique for cooling ink from room temperature so that one printing machine can be commonly used for normal plate printing and waterless planographic printing.
There is one disclosed in No. 62-64549. In this technology, a cooling roller is removably provided on the inking roller opposite to the plate cylinder, a nip pressure adjusting device for the inking roller is attached to the cooling roller, and the cooling roller is connected to the dampening water unit. Cooling water pipes for switching and supplying dampening water are connected to cooling rollers.

However, this technique takes a circumventing means of adjusting the nip pressure between the rollers, so that the structure is complicated and the pressure adjustment and hence the temperature adjustment are difficult. Further, since it is difficult to adjust the pressure and the cooling roller is brought into contact with the inking roller immediately before the plate surface,
There is a problem that the cooling effect is not sufficient and is not stable.

(Summary of the Invention) The present invention has been made in view of the above-mentioned problems, and an improved common water-passing device for an offset printing machine capable of sharing one printing machine for normal plate printing and waterless lithographic printing. The purpose is to simplify the structure,
It is intended to facilitate handling, enhance the cooling effect, and stabilize it.

For this reason, the device of the present invention uses the dampening water device and the dampening water cooling circulation unit as they are, and is a water supply block that can be detachably attached to the water supply port (15) of the water boat (17) for waterless planographic printing. Cooling water supply pipe (23), one end of which is connected to (24)
Through the ink roller group (7), at least one ink roller (27), which is a gold roller and not a swing roller, is allowed to pass cooling water and one end of which is a water boat (17). It is characterized in that the used cooling water from the ink roller (27) is returned to the inside of the water boat (17) through the cooling water return pipe (25) opened to the.

As a result, during waterless lithographic printing that does not require dampening water, the dampening water device and dampening water cooling circulation device unit for normal plate printing can be used as is to cool the ink rollers, and The printing quality can be improved and stabilized by cooling.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of a common water-passing device according to the present invention, and FIG. 2 is a plan view showing a water tank of a dampening water device at the time of normal plate printing. , Fig. 3 shows
Fig. 2 is a cross-sectional view taken along the line III-III, Fig. 4 is a perspective view showing a water boat during waterless lithographic printing, and Fig. 5 is a cross-sectional view of an ink roller through which cooling water flows. is there.

FIG. 1 schematically shows one printing unit that constitutes an offset printing machine. Reference numeral 1 indicates a plate cylinder and reference numeral 2 indicates a blanket cylinder, but an impression cylinder and a transfer cylinder are omitted. Of these, a normal printing plate such as a PS plate or a printing plate for waterless planographic printing in place of this is wound around the plate cylinder (1), and this is shown by reference numeral 3.

The inking device, generally designated by the reference numeral 4, is an ink fountain (5).
The ink stored in the ink is taken out by a doctor roller (6), kneaded while being repeatedly transferred among a large number of ink roller groups (7), guided to an inking roller (8), and supplied to a printing plate (3). is there.

Further, the dampening water device indicated by reference numeral 9 as a whole is a constant temperature bath (1
0), a dampening water cooling circulation unit (13) including a cooler (11) and a pump (12). Then, the dampening water guided by the water supply pipe (14) reaches the water supply port (15) as shown in FIG. 2 and FIG. The water passes through the partition wall (18) and enters the water boat (17) through the conduit (16) opened at the other end near the partition wall (18), flows along the partition wall (18), and drains. Proceed to the opposite side of (19).

The water source roller (20) is immersed in the water boat (17), and the dampening water flowing along the axial direction of the water source roller (20) is
The surplus is returned from the drain port (19) through the water distribution pipe (21) to the constant temperature bath (10) again.

In addition, in the dampening water device shown in FIG. 1, a so-called continuous water supply type in which the watering roller (22) directly contacts the water source roller (20) immersed in the water boat (17) However, the present invention is not limited to this, but can be applied to an intermittent type using a calling roller.

During normal plate printing, the plate (3) is supplied with ink from the inking roller (8) and dampening water from the watering roller (22). Ink and the dampening water adhere to the non-image areas, which are transferred to the blanket cylinder (2) and finally printed on the paper.

However, at the time of waterless planographic printing, since the silicone rubber layer of the printing plate (3) has ink repulsion, the printing plate (3) does not need dampening water. However, as described above, the ink needs to be cooled more than usual in order to improve and stabilize the quality.

Therefore, the dampening water device (9) (particularly, the water boat (17)) and the dampening water cooling circulation unit (13) for normal plate printing are used as they are, and at least those in the ink roller group (7) are used. The device of the present invention is to cool the ink by passing cooling water through the inside of one ink roller.

The cooling water as used herein means the dampening water used during printing of the ordinary printing plate as it is or used after being further cooled by the cooler (11).

In FIG. 4, the water boat (17) at the time of waterless planographic printing is shown. The conduit (16) that led the dampening water from the water supply port (15) toward the partition wall (18) during normal plate printing has been removed, and three cooling water supply pipes (23) have been installed at the water supply port (15). )
The water supply block (24) for supporting the pipe end of the is directly connected. This water supply block (24) has a water inlet (15)
Has a portion for receiving the cooling water, a portion where the pipe ends of the cooling water supply pipe (23) are joined, and a branch communication portion for communicating the both, and the water boat is inserted, screwed or magnetized. It is removably fixed to (17).

Further, as shown in FIG. 4, the support attachment (26) for supporting and fixing the pipe ends of the three cooling water return pipes (25) has a partition wall (18) and a water boat (17) side. It is arranged so as to be sandwiched between the parts. This support attachment (26)
Also, similarly to the case of the water supply block (24), it is detachably fixed to the inside of the water boat (17) by an appropriate mechanical or magnetic means.

As shown in FIG. 1, the cooling water supply pipe (23) with the pipe end detachably attached to the inside of the water boat (17) as described above, is used for any ink of the ink roller group (7). The cooling water is guided to the roller (27), and after cooling, the cooling water return pipe (25) returns the used cooling water to the water boat (17).

Then, the used cooling water returned to the water boat (17) returns to the constant temperature tank (10) via the water distribution port (19) and the water distribution pipe (21).

Although the number of the ink rollers (27) to be cooled is three in this embodiment, it is not limited to this. In selecting it, various factors such as being a gold roller, not being a rocking roller, and being present at a position with high cooling efficiency should be taken into consideration.

FIG. 5 shows a cross section of the ink roller (27) capable of passing water inside. By the way, such an ink roller (27) is already well known.

Both ends of the support shaft (28) of the ink roller (27) are attached to a support block (30) fixed to the side wall (29) of the printing machine, and the support shaft (28) is supplied with cooling water. A receiving port (31) and a return port (31) for the pipe (23) and the cooling water return pipe (25) are attached, respectively. Then, the cooling water that has entered the through hole (33) of the support shaft (28) from the receiving port (31) reaches the void (35) in the roller body (34), and the roller body (made of metal) ( Cool the ink adhering to 34). After this, the cooling water is passed through the other through hole (36) of the support shaft (28).
And returns to the cooling water return pipe (25) through the return port (32).

Incidentally, (37) shows a seal member for the roller body (34), and (38) shows a bearing member.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a shared water passage device according to the present invention. FIG. 2 is a plan view showing the water boat of the dampening water device, which is during normal plate printing. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a perspective view showing a water boat at the time of waterless planographic printing. FIG. 5 is a sectional view of an ink roller through which cooling water is passed. (Explanation of symbols) 1 …… plate cylinder 3 …… printing plate 4 …… inking device 7 …… ink roller group 9 …… dampening water device 10 …… constant temperature bath 11 …… cooler 12 …… pump 13 …… Dampening water cooling / circulation unit 15 …… Water inlet 17 …… Water boat 23 …… Cooling water water supply pipe 24 …… Water supply block 25 …… Cooling water return pipe 26 …… Supporting attachment 27 …… Ink roller 34 …… Roller body 35 ... vacant space

Claims (1)

[Scope of utility model registration request] 1. An offset printing machine comprising an inking unit, a dampening water unit and a dampening water cooling circulation unit for printing on a normal printing plate, wherein the dampening water unit and the dampening water cooling circulation unit are used for lithographic printing. A water passage device that uses the unit as it is, and for waterless planographic printing, a cooling water water supply pipe whose one end is connected to a water supply block (24) that is detachable from the water supply port (15) of the water boat (17). Cooling water is passed through at least one ink roller (27) of the ink roller group (7) that is a gold roller and not a swing roller via the (23), and one end of the water roller The common cooling passage is characterized in that the used cooling water from the ink roller (27) is returned to the inside of the water tank (17) through a cooling water return pipe (25) opened in (17). Water equipment.