JPH0451349B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] 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. [Prior art] A non-image area treated with hydrophilic treatment and an image area (printed picture frame) 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. A printing machine is known in which printing is performed by applying ink only to the printed area and transferring the ink to printing paper. 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 connected to a motor 10 (driving means) via a transmission mechanism 9.
It is designed to be driven separately from the printing machine. 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 protrusion 12a of the lever 12 and the protrusion 14a of the lever 14, and urges the protrusions 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 21 is rotatably supported by a support shaft 20 on a frame or the like, and a rotating shaft 22 of the metering roller 6 is rotatably supported eccentrically from the lever 21 . 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 becomes detached. 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 (water supply means) for supplying water to the water boat 8. [Problems to be Solved by the Invention] In the water supply device having such a configuration, various problems occur when 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 drive the rotation of the water base roller, the attachment/detachment of the metering roller, and the swimsuit roller under certain conditions. An object of the present invention is to provide a water supply device for a printing press that prevents damage to the water supply device. [Means for solving the problem] A water head roller having a part of its peripheral surface arranged inside a water boat, a water supply means for supplying water to the water boat, and a driving means for rotationally driving the water head roller. , a metering roller that contacts the water base roller, a transfer roller that rotates in the opposite direction to the metering roller and contacts it, a swimsuit roller that comes into contact with the transfer roller, a plate cylinder that contacts the swimsuit roller, A first attachment/detachment means for attaching or detaching the contact state of the amount roller transfer roller, and a first attachment/detachment means that changes the contact state of the swimsuit roller and the plate cylinder to the attaching state after the swimsuit roller and the transfer roller come into contact during the attaching operation, and the contact state of the swimsuit roller and the plate cylinder to the attaching state for the detachment operation. When the swimsuit roller and the transfer roller are separated, a second attachment/detachment means is provided which operates to remove the contact between the swimsuit roller and the transfer roller after the swimsuit roller and the printing cylinder are separated, and the water of the water boat is removed from the printing plate while the rollers are in contact with each other. In a water supply device of a printing press configured to supply water to a cylinder, a circuit that operates a driving means that rotates a water head roller under conditions in which the water supply means operates and there is water in a water tank, and a circuit that operates a driving means that rotates a water head roller and rotates the water head roller. A circuit that drives the first attachment/detachment means so that the metering roller is attached after a predetermined time has elapsed and the machine including the plate cylinder is rotating; A circuit is provided for driving the second attachment/detachment means so that the swimsuit roller is brought into the attaching operation after a certain period of time has elapsed. [Function] When the metering roller and transfer roller come into contact, a certain amount of time has passed since the water base roller rotated with water in the water tank, so there is always water in the metering roller. ing. Furthermore, when the swimwear roller and the plate cylinder come into contact, a predetermined period of time has passed since the metering roller and the transfer roller came into contact with each other, so there is always water on the swimsuit roller. [Example] 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. When printing, select switches SS1 and SS2, which are linked to each other, are turned on as shown in the diagram. In this state, when the main unit of the printing machine, such as the plate cylinder, rotates, a main unit rotation relay (not shown) is activated, its relay contacts r ₀₁ and r ₀₃ are turned on, and its relay contact r ₀₂ is turned off. When the switch S is turned on, the water supply relay _R1 operates, and the relay contact _R1 is turned on, and this operation causes the water supply pump 2 in Fig. 2 to operate.
5 operates and water is supplied to the water boat 8. Next, press the push button switch for driving the water head roller.
When A ₁ is pressed to turn on, relay contact r ₁ is on, so relay R ₂ for driving the water head roller operates, relay contacts r ₂₁ and r ₂₂ are on, and relay contact r ₂₃ is off. When the relay contact _r21 is turned on, the operation of the relay _R2 is self-maintained, and the operation of the relay _R2 causes the motor 10 shown in FIG. 1 to rotate and the water head roller 5 to be rotationally driven. In addition, if you press the push button switch B ₁ for stopping the water head roller drive to turn it off,
The self-holding of relay _R2 is released and the rotation of the water base roller stops. 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. 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 to be 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. 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, use select switches SS1 and SS2.
Switch to turn on the lower position in the diagram. In this state, when the switch S is turned on, the relay _R1 operates and water is supplied to the water boat, and at the same time, the relay contact _r1 is turned on. Next, when the push button switch _A1 is turned on, the relay _R2 is operated and the water head roller is rotated, and at the same time, the relay contacts _r21 and _r22 are turned 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. Here, press the push button switch for the metering roller.
When A ₂ is pressed and turned on, since timer contact t ₁₂ is on, relay R ₃ is activated and the metering roller is turned on, and at the same time relay contacts r ₃₁ and r ₃₂ are turned on. In this case, relay R ₂ does not operate and timer relay T ₁
When the water head roller is stopped and the machine is not operating, the relay contact
Since r ₀₂ and r ₂₃ are both turned on, the timer relay
Relay R ₃ operates even if timer contact t ₁₂ is off due to non-operation of T ₁ . The relay is turned on by turning on relay r ₃₁ .
The operation of R ₃ is self-sustaining. Note that when the push button switch _B2 for removing the metering roller is pressed to turn it off, the self-holding of the relay _R3 is released and the metering roller is removed from the transfer roller. 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. 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】

〔Effect of the invention〕

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 drawings]

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 having a part of its peripheral surface disposed inside the water boat, a water supply means for supplying water to the water boat, a driving means for rotationally driving the water fountain roller, and a contact with the water fountain roller. a transfer roller that rotates in the opposite direction to the metering roller and comes into contact with the metering roller, a swimsuit roller that comes into contact with the transfer roller, a plate cylinder that comes into contact with the swimsuit roller, and the metering roller and the transfer roller. a first attachment/detachment means that changes the contact state between the swimsuit roller and the transfer roller to put on or take off; and a first attachment/detachment means that changes the contact state between the swimsuit roller and the transfer roller to put on or off during the put on operation, and then changes the contact state between the swimsuit roller and the plate cylinder to put on and off when the swimsuit roller comes in contact with the transfer roller; and a second attachment/detachment means that operates to remove the contact state between the swimsuit roller and the transfer roller after the plate cylinders are separated, and supply water from the water boat to the plate cylinder with each roller in contact with each other. In the water supply device for a printing press, the water supply means operates to operate a driving means for rotationally driving the water head roller under the condition that there is water in the water tank; a circuit for driving the first attachment/detachment means to remove the metering roller after a predetermined period of rotation and under the condition that the machine including the plate cylinder is rotating; and the metering roller. and a circuit for driving the second attachment/detachment means so that the swimsuit roller is attached after a predetermined lapse of time after the swimsuit roller is attached.