JP6721234B2 - Wetting device for printing machine - Google Patents

Description

The present invention relates to a dampening device (water supply device) for a printing machine, and more particularly to a dampening device for supplying dampening water from a water source such as a water boat to the plate surface of a plate cylinder of a printing unit in the printing machine.

In a printing press, the temperature of dampening water is controlled, and in Patent Document 1, a dampening water device controls the temperature of dampening water in a water boat for controlling the temperature of dampening water. A device is disclosed.

The dampening water temperature control device in this dampening water device is a device for controlling the temperature of the dampening water in the water boat, and is a dampening water temperature detecting means for detecting the actual dampening water temperature in the water boat. A thermoelectric cooling element that adjusts the temperature of the dampening water by heating or cooling the dampening water in the water boat; a memory in which the optimum temperature of the dampening water stored in the water boat is preset; The control unit controls the thermoelectric cooling element so that the detected temperature from the water temperature detecting unit and the optimum temperature preset in the memory are compared and the detected temperature becomes the same as the optimum temperature.

JP 2001-199052 A

According to the dampening water device of the printing machine of Patent Document 1 described above, printing quality is improved by controlling the temperature of the dampening water, but the temperature is controlled at a position away from the plate surface, and the temperature of the dampening water is stable. However, there is a problem in that the number of prints from printing to stable printing is large.

An object of the present invention is to provide a wet water device of a printing machine, which can reduce the number of prints from printing to stable printing.

First Shimemizu apparatus invention of the printing press by the (Claim 1) is provided with a dip roller water source side, and the dampener rollers of the printing unit side, and an intermediate roller disposed between the rollers In the wet water device of the printing press, the roller located on the side closer to the plate surface among the intermediate rollers is a rocking roller capable of reciprocating in the axial direction and is subjected to a hydrophilic treatment. The roller is hollow, and a cooling device for supplying cooling water is provided inside the roller .
A wet water device for a printing press according to a second aspect of the present invention comprises a water source side water source roller, a printing portion side watering roller, and an intermediate roller arranged between both rollers. In a wet water device of a printing machine, a cooling device that supplies cooling water to the inside of a hollow intermediate roller is provided, and the intermediate roller has a drive side end that is driven by a gear. The tip of the water supply pipe faces the vicinity of the drive side end of the intermediate roller .

The roller used in the wet water device is a water source roller immersed in a water boat, a watering roller that contacts the plate cylinder, and one or two intermediate rollers provided between the water source roller and the watering roller. And so on. The water source roller is a roller whose surface is chrome-plated, which is called a chrome roller, and the watering roller is a rubber roller whose surface is rubber. When there is one intermediate roller, the intermediate roller is a chrome roller, and when there are two intermediate rollers, the intermediate roller is a chrome roller and a rubber roller. Whether the number of intermediate rollers is one or two, a chrome roller is included as an intermediate roller, and a cooling device is provided on the intermediate chrome roller (chrome roller closer to the plate surface).

By providing the cooling device on the chrome roller closer to the plate surface, the dampening water is supplied to the plate surface after being cooled to a constant temperature at a position close to the plate surface. As a result, the temperature of the dampening water on the plate surface reaches the set temperature early and is stably maintained. Therefore, the number of prints from printing to stable printing can be reduced.

The cooling device may include a water supply pipe inserted into the intermediate roller, a pump that feeds the cooling water to the water supply pipe, and a flow rate adjustment valve that adjusts the flow rate of the cooling water.

By adjusting the flow rate of the cooling water, the temperature of the dampening water on the intermediate roller can be finely adjusted, and the temperature of the dampening water can be accurately controlled.

It is preferable that the intermediate roller has a drive-side end that is driven by a gear, and the tip of the water supply pipe faces the vicinity of the drive-side end of the intermediate roller.

The chrome roller used in the wet water device is driven by a gear and is connected by a gear at one end side so as to rotate in synchronization with a water source roller and the like. Since heat is generated at one end side where the gears are connected, the dampening water on the chrome roller has a relatively high temperature on the gear drive side and a relatively low temperature on the counter gear drive side. It causes quality deterioration. Since the tip of the water supply pipe faces the drive side end of the chrome roller, the dampening water on the gear drive side of the chrome roller is further cooled, and the temperature gradient on the chrome roller is eliminated. As a result, the print quality is further improved.

According to the dampening device of the printing machine of the present invention, as described above, the temperature of the dampening water on the plate surface reaches the set temperature early and is stably maintained, whereby the printing is stabilized, The number of prints from printing to stable printing can be reduced.

FIG. 1 is a side view of a wet water device of a printing machine showing one embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the main part of FIG.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, the printing machine (1) includes a plate cylinder (2) on which a printing plate is mounted, an ink supply device (3) for supplying ink to the plate cylinder (2), and a plate cylinder (2). And a dampening device (4) for supplying dampening water.

The ink supply device (3) is arranged immediately downstream of the ink fountain roller (12) and the ink fountain roller (12) in which part of the ink fountain (11) is immersed in the ink fountain (11). Ink is supplied by contacting the selected ink feeding roller (13), the ink delivery roller (14) located immediately downstream of the ink feeding roller (13), and the printing plate (plate surface) of the plate cylinder (2). A plurality of inking rollers (15), and a plurality of sets of an ink kneading roller (16) and an ink reciprocating roller (17) arranged between the ink transfer roller (14) and the inking roller (15). ing.

Each roller (12)(13)(14)(15)(16)(17) is arranged with its axial direction oriented in the width direction of the printed matter (direction orthogonal to the printing direction of the printing machine), and at both left and right ends. It is rotatably supported by the frame of the printing machine. Of the rollers (12)(13)(14)(15)(16)(17), the required rollers (12)(14)(17) are rotated at a predetermined rotational speed synchronized with each other by a drive device (not shown). To be

According to the ink supply device (3), the ink in the ink fountain (11) is transferred to the ink source roller (12), the ink feeding roller (13), the ink delivery roller (14), the plurality of ink kneading rollers (16) and the ink. It is transmitted to the inking roller (15) through the reciprocating roller (17) and is supplied to the plate surface of the plate cylinder (2).

Although illustration is omitted, the ink feeding roller (13) is formed by a plurality of divided rollers arranged in the longitudinal direction, and each divided roller is separated from the ink delivery roller (14) by an appropriate switching device. It can be switched to a position in contact with the original roller (12) and a position in contact with the ink delivery roller (14) apart from the ink original roller (12). As a result, the circumference of the ink that is called from the ink fountain (11) to the divided rollers of the ink calling roller (13) is controlled, and as a result, the amount of ink supplied to the printing surface is adjusted by the position in the width direction.

According to such an ink supply device (3), the ink amount is controlled for each divided roller of the ink feeding roller (13) according to the fact that the optimum ink amount varies depending on the position in the width direction depending on the pattern of the printed matter. .. This improves the accuracy of controlling the ink amount.

The ink supply device (3) is provided with a plurality of ink keys arranged in the length direction of one non-divided ink feeding roller adjacent to the ink fountain (11), and the opening of the ink key is adjusted. Therefore, the optimum ink amount may be obtained depending on the position in the width direction depending on the pattern of the printed matter.

The dampening device (4) includes a water boat (21) for storing dampening water, a water source roller (22) partly immersed in the water boat (21), and a plate cylinder (2) for dampening water. Watering roller (23) for transferring to the surface of the printing plate mounted on the outer peripheral portion of the roller, and a metering roller (24) disposed between the water source roller (22) and the watering roller (23) And two intermediate rollers (24) and (25), which are rocking rollers (25), a rider roller (26) for leveling the dampening water on the watering roller (23), and a rocking roller (25 shown in FIG. ) Cooling device (27).

The water source roller (22) and the swing roller (25) are chrome rollers, the watering roller (23) and the metering roller (24) are rubber rollers, and the rider roller (26) is a copper roller. The chrome roller is an iron roller that has been subjected to a hydrophilic treatment such as chrome plating, and can uniformly and stably supply dampening water.

Each roller (22)(23)(24)(25)(26) is arranged with its axial direction oriented in the width direction of the printed material (direction orthogonal to the printing direction of the printing machine), and printing is performed at both left and right ends. It is rotatably supported by the machine frame.

The water source roller (22) is rotated by driving a motor, and the amount of dampening water supplied to the plate surface of the plate cylinder (2) is adjusted by changing the rotation speed of the water source roller (22). be able to.

The water source roller (22) constantly rotates with the lower half part immersed in water in the water boat (21), and the watering roller (23) keeps contact with the plate surface of the plate cylinder (2). It always rotates.

The metering roller (24) is opposed to the water source roller (22), and the swing roller (25) is arranged between the metering roller (24) and the watering roller (23). ..

The metering roller (24) has the same structure as the ink feeding roller (13), and is designed to obtain an optimum dampening water amount depending on the position in the width direction depending on the pattern of the printed matter.

The swing roller (25) is connected to the water source roller (22) by a gear and rotates in synchronization with the water source roller (22). The rocking roller (25) is capable of reciprocating in the axial direction while being in contact with the metering roller (24). The rider roller (26) is also reciprocally movable in the axial direction.

The metering roller (24) is not limited to the same structure as the ink feeding roller (13) and may be one roller. In this case, a plurality of dampening water amount adjusting devices are arranged side by side in the axial direction of the metering roller, and the amount of air blown to each region divided in the axial direction of the metering roller can be adjusted by a valve mechanism. It is preferably provided. The swing roller (25) may be a chrome roller that does not swing.

While the ink is being supplied from the ink supply device (3) to the plate surface of the plate cylinder (2), the water in the water tank (21) causes the water source roller (22), the intermediate rollers (24) (25) and the watering roller. It is supplied to the plate surface of the plate cylinder (2) as dampening water via (23). The dampening water is supplied to the non-picture area, and the ink is supplied in a state where the non-picture area is covered with the dampening water. At this time, in the non-picture area covered with the dampening water, ink does not adhere due to the repulsion of oil and water, and the oil-based ink adheres only to the picture area, so that an ink image is formed on the plate surface of the printing plate. In this way, the ink supplied from the ink supply device (3) repels the thin film of dampening water supplied from the dampening device (4) and is supplied to the pattern area of the plate cylinder (2). Since the dampening water has a great influence on the quality of the printed matter, it is an issue to supply it properly.

As shown in FIG. 2, the rocking roller (25) provided with the cooling device (27) is hollow, and is provided on the hollow roller body (25a) and the left end of the roller body (25a). The solid shaft (25b) and the hollow shaft (25c) provided at the right end of the roller body (25a).

The rocking roller (25) has a left end solid shaft (25b) and a right end hollow shaft (25c) rotatably supported by the frame (5) via rolling bearings (6).

The cooling device (27) includes a water supply pipe (31) inserted into the swing roller (25) from the right end side, and a pump (33) for sending the cooling water in the cooling water tank (32) to the water supply pipe (31). And a flow rate adjusting valve (34) for adjusting the flow rate of the cooling water.

The left end portion of the rocking roller (25) is driven by a gear (not shown), and the left end portion (tip end) of the water supply pipe (31) is located at the left end portion of the rocking roller (25) (by the gear wheel). It is exposed to the vicinity of the part that is being driven).

A drainage collection box (35) is provided so as to close the right end opening of the hollow shaft (25c) of the rocking roller (25), and the cooling water supplied from the water supply pipe (31) is supplied to the roller body (25a). ) Is cooled and then collected in the waste water collection box (35) and returned to the cooling water tank (32).

When the temperature of the dampening water is normal temperature, there is a problem that stains are likely to appear on the print. By cooling the rocking roller (25), the dampening water is cooled and the print quality is improved. Here, the dampening water can also be cooled by cooling the water boat (21), but in this case, since the water boat (21) is separated from the plate surface of the plate cylinder (2), There is a problem that it takes time for the temperature of the drainage water to stabilize, and the number of defective products to be printed increases until it stabilizes.

According to the wet water device (4) described above, the rocking roller (25) which is a chrome roller (the water source roller (22) is also a chrome roller, but is not this, but the chrome roller closer to the plate surface is cooled). As a result, the temperature of the dampening water can be stabilized, and the amount of the dampening water can also be stabilized. Therefore, conventionally, the amount of dampening water was adjusted by the feeling of a person, and the amount of time required for the temperature of the dampening water to stabilize and its variation were large, but the amount of dampening water stabilized. By doing so, it is possible to eliminate the need for adjustment by the human sense. As a result, it is possible to significantly reduce wasteful printing, which was from tens to hundreds of sheets.

The amount of dampening water is adjusted by the position in the width direction depending on the pattern of the printed matter, and the pressure acting between the rollers (22)(23)(24)(25)(26) and the roller (22 )(23)(24)(25)(26) is also adjusted by the rotation speed. By cooling the rocking roller (25), the amount of dampening water can be reduced, which is also advantageous in suppressing the concentration fluctuation.

According to the above cooling device (27), by adjusting the flow rate of the cooling water with the flow rate adjusting valve (34), the temperature of the dampening water on the rocking roller (25) can be finely adjusted, and the dampening water can be accurately adjusted. The temperature of the sewage can be controlled. In addition to cooling the rocking roller (25), the water boat (21) may be cooled, but by using the flow rate adjusting valve (34), cooling of the water boat (21) is unnecessary. be able to.

In the wet water device (4), the left end portion of the swing roller (25) is driven by the gear, so that heat is generated at the left end portion. Therefore, in the conventional cooling water for dampening water of the watercraft (21), the dampening water on the rocking roller (25) is relatively hot on the left end side (gear drive side) and on the right end side (counter gear drive side). On the side), the temperature becomes relatively low, and this temperature gradient causes a decrease in print quality.

According to the cooling device (27), the tip of the water supply pipe (31) faces the vicinity of the left end side portion of the rocking roller (25), so that the gear driving side on the rocking roller (25) is The dampening water in the section is further cooled, and the temperature gradient is eliminated, so that the print quality is further improved.

Incidentally, the roller constituting the wet water device (4) is not limited to the above, there are various ones, but by providing the cooling device (27) on the chrome roller closer to the plate surface, The above effect can be obtained regardless of the configuration of.

(4) Wet water device
(22) Mizumoto roller
(23) Watering roller
(25) Chrome roller (intermediate roller)
(27) Cooling device
(31) Water pipe
(33) Pump
(34) Flow control valve

Claims (4)

In a dampening device of a printing machine, which comprises a water source side water source roller, a printing unit side watering roller, and an intermediate roller arranged between both rollers,
Among the intermediate rollers, the roller located on the side closer to the plate surface is a rocking roller capable of reciprocating in the axial direction, and is subjected to a hydrophilizing treatment. This rocking roller is hollow, A wet water device for a printing press, comprising a cooling device for supplying cooling water therein. The printing apparatus according to claim 1, wherein the cooling device includes a water supply pipe inserted in the intermediate roller, a pump for feeding the cooling water to the water supply pipe, and a flow rate adjusting valve for adjusting the flow rate of the cooling water. Machine wet water equipment. In a dampening device of a printing machine, which comprises a water source side water source roller, a printing unit side watering roller, and an intermediate roller arranged between both rollers,
A cooling device that supplies cooling water to the inside of the hollow intermediate roller is provided.
Intermediate roller has a drive-side end that is driven by a gear, the leading end portion of the water supply pipe, humidity printing machine characterized in that it is facing in the vicinity of the drive-side end of the intermediate roller Water equipment. The wet water device for a printing press according to any one of claims 1 to 3, wherein the intermediate roller provided with the cooling device is a chrome roller obtained by plating an iron roller with chrome.

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