JPH0341348B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a water supply device for a printing press that supplies ink and dampening water to a plate cylinder for printing. A non-surface line area treated with hydrophilic treatment and an image area (printed picture area) treated with water repellency are formed on the plate surface of the plate cylinder, and ink and dampening water are supplied to the plate surface to form ink and image lines. A printing machine is known in which the ink is applied only to one area and the ink is transferred to printing paper to perform printing. FIG. 1 is a block diagram of a water supply device for such a printing press. In the figure, an ink forming roller 2 and a swimsuit roller 3 are in contact with the plate surface of a plate cylinder 1 rotating in direction A, and these rollers are in contact with the plate surface.
It is designed to be removable. Ink is supplied from an ink fountain (not shown) to the ink form roller 2 via a group of rollers including a swing roller 4, and dampening water is supplied from a water source roller 5 to a bathing roller 3 via a metering roller 6 and a transfer roller 7. be done. The water base roller 5 is immersed in water stored in a water boat 8, and is driven separately from the printing machine by a motor 10 via a transmission mechanism 9. Each roller is designed to rotate in the directions of arrows B, C, D, and E, but the rotation directions of the contact surfaces of the metering roller 6 and transfer roller 7 are opposite to each other in order to transfer the water smoothly. It's summery. FIG. 2 is a configuration diagram of the attachment/detachment device for the water supply roller group. In the figure, a pin shaft 13 is fixed to the tip of a lever 12 that is rotatably provided with respect to the rotating shaft 11 of the transfer roller 7, and a lever 14 is rotatably provided on this pin shaft 13. Lever 14
A rotary shaft 15 of the swimsuit roller 3 is rotatably supported at one end of the swimsuit roller 3. A spring 16 is interposed between the protruding portion 12a of the lever 12 and the lever 14 and the protruding portion 14a, and urges both protruding portions away from each other. Due to the force of this spring 16, the swimsuit roller 3 is attached to the transfer roller 7.
A piston rod of a cylinder 17 is connected to the lever 14. The figure shows a state in which the piston rod is extended and the swimsuit roller 3 is attached to the plate cylinder 1. Here, when the cylinder 17 is operated and the piston rod is retracted, the levers 12 and 14 are rotated together in the clockwise direction in the figure around the support shaft 11, and the swimsuit roller 3 is separated from the plate cylinder 1 and is in the detached state. Become. After the lever 12 has rotated to a certain extent, it hits the stop pin 18 and stops, so the lever 14
is rotated about the pin shaft 13 against the spring 16, and the swimsuit roller 3 is further separated from the transfer roller 7. When the cylinder 17 is operated and the piston rod is extended, the operation is performed in the reverse order as described above, and the wet roller 3 is brought into contact with the plate cylinder 1. That is, the rotation shaft 11 of the transfer roller 7, the lever 12, the pin shaft 13, the lever 14, and this lever 14.
A means for attaching or detaching the contact state between the swimsuit roller 3 and the plate cylinder 1 (a second attachment/detachment means) using the protruding portion 14a of the swimsuit roller 3, the rotating shaft 15 of the swimsuit roller 3, the spring 16, the cylinder 17, the stop pin 18, etc. means) are configured. On the other hand, a lever shaft 21 rotatably supported on a frame or the like by a support shaft 20 rotatably supports a rotating shaft 22 of the metering roller 6 eccentrically therefrom. A piston rod of a cylinder 23 is connected to this lever shaft 21. In addition, 24 is the rotating shaft of the water head roller 5, and since the rotating shafts 22 and 24 are maintained at a constant interval, the water head roller 5 and metering roller 6 are always in contact with each other with a predetermined pressure to maintain the wet state. It's summery. The figure shows the state in which the piston rod is retracted and the metering roller 6 is attached to the transfer roller 7. Here, when the cylinder 23 operates and the piston rod extends, the lever shaft 21 rotates, and as a result of this rotation, the eccentric metering roller 6 separates from the transfer roller 7 and enters the disengaged state. Needless to say, when the cylinder 23 operates and the piston rod is retracted, the metering roller 6 will be placed on the transfer roller 7 again. That is, the support shaft 20, the lever shaft 21, the rotation shaft 2
2, and a means for attaching or detaching the contact state between the metering roller 6 and the swimsuit roller 3 via the transfer roller 7 using the cylinder 23 or the like (first attachment/detachment means)
is configured. In addition, 25 is a water supply pump for supplying water to the water boat 8. In the water supply device having such a configuration, various problems occur if the water source roller 5 is rotated and the swimwear roller 3 and metering roller 6 are arbitrarily attached and detached. In other words, if the water head roller rotates when there is no water in the water boat, there will be no water film on the contact surface between the water head roller and the metering roller, and the coefficient of friction between them will increase, and even a slight slip will cause the metering roller to elastic surface is damaged. In addition, if the metering roller is moved and comes into contact with the metering roller when there is no water film on its surface, the surface of the metering roller will be damaged as well because the contact surfaces of these rollers are rotating in opposite directions. Ru. Furthermore, a large load is placed on the motor that drives the water head roller, resulting in burnout of the motor. Additionally, if the swimsuit roller reaches the plate cylinder when there is no water film on the surface of the transfer roller, ink from the plate will adhere to the swimsuit roller, and after this ink is transferred to the transfer roller, it will adhere to the metering roller. , it may contaminate the metering roller or cause a large amount of friction on the slip part in the opposite direction. The present invention has been made in view of these points, and its purpose is to
To provide a water supply device for a printing press which prevents damage to each part by driving the rotation of a water base roller and the attachment/detachment of a metering roller and a bathing roller under certain conditions even during nip pressure adjustment work. There is a particular thing. Hereinafter, the present invention will be explained in detail with reference to Examples. FIG. 3 is a circuit diagram of an embodiment of a water supply device for a printing press according to the present invention. During printing, select switches SS1 and SS2, which are linked to each other, are turned on as shown in the figure. In this state, when the main unit of the printing machine such as the plate cylinder rotates, the main unit rotation relay (not shown) operates.
Its relay contacts r ₀₁ and r ₀₃ turn on, and relay contact r ₀₂
turns off. When the switch S is turned on here, the water supply relay R ₁ operates, and the relay contact R ₁ is turned on, and this operation also operates the water supply pump 25 shown in FIG. 2 to supply water to the water boat 8. . Next, when push button switch A ₁ for driving the water head roller is pressed to turn it on, relay contact r ₁ is on, so relay R ₂ for driving the water head roller operates, and relay contacts r ₂₁ and r ₂₂ are turned on. turns on and relay contact _r23 turns off. When relay contact r ₂₁ is turned on, the operation of relay R ₂ is self-maintained, and the operation of relay R ₂ causes the first
The illustrated motor 10 rotates, and the water head roller 5 is rotationally driven. Note that when the water head roller drive stop push button switch _B1 is pressed to turn off, the self-holding of the relay _R2 is released and the rotation of the water head roller is stopped. That is, switch S, water supply relay R ₁ ,
By the relay contact r ₁ of this relay R ₁ , the push button switch A ₁ for driving the water base roller, the relay R ₂ for driving the water base roller, and the relay contact r ₂₁ for self-holding this relay R ₂ , a circuit (first circuit) for rotationally driving the water base roller 5 under the condition that water is present in the water boat 8 is configured. In addition, timer relay T ₁ is activated by turning on relay contact r ₂₂ , and after a certain period of time, timer contacts t ₁₁ and t ₁₂ are turned on.
is turned on. This timer time is set to a length sufficient for the water source roller to rotate and the water to rise up to the metering roller. By turning on timer contact _t11 ,
Since relay contact r ₀₁ is already on, relay R ₃ attached to the metering roller operates, and relay contacts r ₃₁ and r ₃₂
turns on. The operation of this relay _R3 causes the cylinder 23 shown in FIG. That is, the relay contact r ₂₂ of the drive relay R ₂ of the water head roller 5, the timer relay T ₁ , the relay contact t ₁₁ of this timer relay T ₁ , the relay contact r ₀₁ that turns on in response to the start of operation of the machine, and the adjustment The metering roller 6 is connected to the water base roller 5 by the relay R ₃ of the metering roller 6 when the metering roller 6 is rotated and the machine including the plate cylinder 1 is rotating after a predetermined period of time has passed since the metering roller 5 has been rotated. A circuit (second circuit) is configured to drive the above-described first attachment/detachment means so as to be attached at the same time. In addition, the timer relay is activated by turning on relay contact _r32 .
T ₂ operates, and after a certain period of time, timer contact t ₂ turns on. This timer period is set long enough for the metering roller to rotate and transfer the water to the transfer roller 7. Here, when push button switch A ₃ for wearing swimsuit rollers is pressed to turn on, relay contact r ₀₃ is turned on and timer contact t ₂ is also on, so relay R ₄ for wearing swimsuit rollers is activated and relay contact r ₄ is turned on. do.
The operation of relay _R4 is self-maintained by turning on relay contact _r4 . This _R4 operation causes the cylinder 17 shown in FIG. In addition, there is a push button switch to remove the swimsuit roller.
When B ₃ is pressed to turn it off, the self-holding of relay R ₄ is released and the swimsuit roller 3 is released from the plate cylinder 1. That is, the relay contact r ₃₂ of the relay R ₃ for wearing the metering roller 6, the timer relay T ₂ , the relay contact t ₂ for this timer relay T ₂ , the push button switch A ₃ for wearing the swimsuit roller 3, and the operation of the machine. The relay contact r ₀₃ that turns on in response to the start, the relay R ₄ for wearing the swimsuit roller, and the relay contact r ₄ of this relay R ₄ cause the swimsuit roller to be turned on after a predetermined period of time has passed after the metering roller 6 has been placed on the swimsuit roller. A circuit (fourth circuit) is configured to drive the second attachment/detachment means described above so as to attach the plate 3 to the plate cylinder 1. Thus, during printing operations, the relationship between the operation of the water supply device and the conditions under which the operation is performed is as shown in Table 1 below.

[Table] Note that the ○ mark indicates that the conditions were satisfied. If even one of these conditions is missing, the operation will not be performed. Next, when adjusting the nip pressure between each roller, select switch SS1 and SS
Switch 2 and turn it on at the lower position in the diagram. Methods for adjusting the nip pressure include a roller rotation adjustment method and a roller stop adjustment method, as will be described in detail later. In the roller rotation adjustment method, with select switches SS1 and SS2 switched to the lower position in FIG. 3, when switch S is turned on, relay _R1 operates to supply water to the water boat, and at the same time, relay contact _r1 is turned on. Next, when push button switch A ₁ is turned on, relay R ₂
operates, the water head roller rotates, and at the same time relay contacts r ₂₁ and r ₂₂ turn on. Relay R ₂ is self-held when relay contact r ₂₁ is turned on, and timer relay T ₁ is activated when relay contact r ₂₂ is turned on, and timer contacts t ₁₁ and t ₁₂ are turned on after a certain period of time. Press the push button switch A ₂ on the metering roller here.
When pressed to turn on, since timer contact _t12 is on, relay _R3 is activated and the metering roller is turned on, and at the same time relay contacts _r31 and _r32 are turned on. Relay _R3 is self-held by turning on relay contact _r31 . In addition, in the roller stop adjustment method, the adjustment work is performed by turning on push button switch _A2 while both the water head roller and the main machine (printing machine) are stopped. In this case, pushbutton switch A ₁ is not pressed, so relay R ₂ does not operate, timer relay T ₁ does not operate, the water head roller is stopped, and the machine rotation has also stopped, so the relay Contacts r ₀₂ and r ₂₃ are both turned on. Therefore, even if the timer contact _t12 is off due to the non-operation of the timer relay _T1 due to the non-operation of the relay _R2 , when the pushbutton switch _A2 is pressed to turn it on, the relay contacts _r02 , _r23 are turned on. Through relay R ₃
Current flows through and relay _R3 operates. By turning on relay contact ₃₁ , the operation of relay _R3 is self-maintained. In addition, there is a push button switch B ₂ to remove the metering roller.
When pressed to turn off, the self-holding of relay _R3 is released and the metering roller is removed from the transfer roller. That is, the push button switch A ₂ for the metering roller 6, the relay R ₃ for the metering roller 6, the relay contact r ₃₁ of this relay R ₃ , the relay contact r ₀₂ , and the relay for driving the water base roller 5. R ₂ relay contact r ₂₃ ,
Then, by the timer contact _t12 , the metering roller 6 is moved and the roller 7 is moved under the condition that the water head roller 5 has rotated and a predetermined time has elapsed, or under the condition that the water head roller 5 has stopped and the machine has stopped. A circuit (third circuit) is configured to drive the first attachment/detachment means described above so as to attach the swimsuit roller 3 via the swimsuit roller 3. In addition, when push button switch _A3 is turned on at any time, relay _R4 is operated and the swimsuit roller is attached to the plate cylinder, and at the same time, relay contact _R4 is turned on and the operation of relay _R4 is self-maintained. Ru. That is, the circuit between the lower fixed contact of the select switch SS2 and the relay _R4 drives the second attachment/detachment means mentioned above so that the swimsuit roller 3 can be attached to the plate cylinder 1 at any time. (fifth circuit) is configured. Thus, during adjustment work, the relationship between the operation of the water supply device and the conditions under which the operation is performed is as shown in Table 2 or Table 3 below.

【table】

[Table] If even one of these conditions is missing, the operation will not be performed. In this embodiment, a transfer roller is provided between the metering roller and the swimwear roller, but the transfer roller may be brought into contact with the metering roller to directly supply water. In addition, the above-mentioned nip pressure refers to the swimsuit roller 3,
It refers to the contact pressure between two rollers that are in contact with each other in each roller such as the transfer roller 7, metering roller 6, and water base roller 5. This nip pressure adjustment work is performed, for example, in the following manner. (a) With two rollers in contact with each other stopped, a predetermined amount of ink is applied to the contact surface between the released rollers. Next, when these two rollers are brought into contact, the ink spreads over the contact surfaces. Then, the nip pressure is detected and adjusted by removing the two rollers and detecting the area of ink spread on the contact surface. Hereinafter, this will be referred to as the roller stop adjustment method. (b) A method of detecting and adjusting the nip pressure by visually observing the state of the liquid film formed on the roller surface by water supplied from the water boat 8 while rotating two rollers that are in contact with each other. . Hereinafter, this will be referred to as the roller rotation adjustment method. These two adjustment methods will be explained with reference to the respective operations during adjustment work. In the roller stop adjustment method, when adjusting the nip pressure between the metering roller 6 and the transfer roller 7, it is necessary to make sure that the water base roller 5, which is in constant contact with the metering roller 6, is stopped and that the transfer roller 7 is The condition is that the machine is not rotationally driven by the rotation of the barrel 1, in other words, that the machine is stopped. That is,
In Fig. 3, the select switch SS1 is turned on at the lower position, the timer contact _t12 is off, and the water head roller drive relay _R2 is inoperable, so the relay contact r of the water head roller drive relay _R2 is turned on. ₂₃ is on,
Since the machine is stopped, relay contact r ₀₂ is turned on, and only when the condition that relay contact r ₂₃ is turned on is met, the push button switch A ₂ is turned on, and the first attachment/detachment means is turned on. is driven and the metering roller 6 is placed in position. On the other hand, in the roller rotation adjustment method, when adjusting the nip pressure between the rotating metering roller 6 and transfer roller 7, only after water has been sufficiently supplied to the metering roller 6 by the water source roller 5. In other words, it is necessary that the water source roller 5 rotates under the condition that there is water in the water boat 8, and that the metering roller 6 is turned off only after a predetermined period of time. If this condition is not met and the metering roller 6 and transfer roller 7, which rotate in opposite directions, become stuck, both rollers will be damaged as described above. That is, if water is supplied to the water boat 8 and the water head roller 5 rotates for a predetermined time, the timer contact _t12 , which is turned on, is turned on, and the push button switch _A2 is turned on. The attachment/detachment means 1 is driven and the metering roller 6 is attached. In addition, since the water head roller 5 is being driven at this time, the relay contact
_r23 is off, and only the timer contact _t12 is active. As described above, according to the water supply device for a printing press according to the present invention, during normal printing work or adjustment work, the rollers that do not have a water film on their surfaces do not rotate in contact with each other, so there is no possibility of slips caused by operational errors. This has the excellent effect of preventing accidents such as damage to the roller surface and transfer of ink to the roller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a water supply device for a printing press that uses ink and dampening water, FIG. 2 is a block diagram of a device for attaching and detaching a group of water supply rollers, and FIG. 3 is an implementation of the water supply device for a printing press according to the present invention. FIG. 3 is an example circuit diagram. 1... Plate cylinder, 2... Ink forming roller, 3... Swim roller, 5... Water base roller, 6... Measuring roller, 7... Transfer roller, 8... Mizufune, 10... Motor, 17, 23... Cylinder, 25... Water supply pump, SS1, SS2... Select switch, R ₁ ...
... Water supply relay, R ₂ ... Relay for driving the water base roller, R ₃ ... Relay for metering roller, R ₄ ... Relay for wearing swimsuit roller, T ₁ , T ₂ ... Timer relay.

Claims (1)

[Claims] 1. A water head roller with a part of its circumferential surface disposed inside a water boat, a metering roller in contact with the water head roller, and a swimsuit roller in direct or indirect contact with the metering roller. a plate cylinder in contact with the swimsuit roller; a first attachment/detachment means for connecting or disconnecting the metering roller and the swimsuit roller; and a first attachment/detachment means for connecting or disconnecting the contact state between the swimsuit roller and the plate cylinder. A water supply device for a printing press, comprising a second attaching/detaching means and configured to supply water from the water tank to the plate cylinder with each roller in contact with each other, under the condition that water is present in the water tank. a first circuit that rotationally drives the water head roller; a first select switch that selects a connection state between printing work and nip pressure adjustment work; a second select switch that selects the connection state during printing work or nip pressure adjustment work; and when the first select switch selects the connection state during print work, the water head roller a second circuit that drives the first attachment/detachment means to remove the metering roller after a predetermined period of time has elapsed since the plate cylinder has rotated, and under the condition that the machine including the plate cylinder is rotating; When the first select switch selects the connection state during nip pressure adjustment work, the conditions are set after the water head roller rotates and a predetermined period of time elapses, or when the water head roller stops and the machine is turned off. a third circuit that drives the first attachment/detachment means so that the metering roller is turned on when the metering roller is stopped; and the second selection switch selects a connection state during printing work. and a fourth driving means for driving the second attachment/detachment means to attach the swimsuit roller to the bathing suit roller after a predetermined period of time has elapsed after the metering roller has been attached to the bathing suit roller and under the condition that the machine including the plate cylinder is rotating. a circuit for driving the second attachment/detachment means to attach the swimsuit roller at any time when the second select switch selects the connection state during the nip pressure adjustment operation; A water supply device for a printing press equipped with a circuit of 5.