JPH0232985B2 - - 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-image area treated with hydrophilic treatment and an image area (printed picture area) treated with water-repellent treatment 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 configuration diagram of an example of a water supply device used in such a printing press. In the figure, an ink forming roller 2 and a wet roller 3 are in contact with the plate surface of a plate cylinder 1 rotating in direction A, and these rollers are configured to be attached to and detached from the plate surface at will. . Ink is supplied from an ink fountain (not shown) to an ink forming roller 2 via a group of rollers including a swing roller 4, and dampening water is supplied from a fountain roller 5 having a hydrophilic surface to a transfer roller 6 also having a hydrophilic surface. Then, it is supplied to a swimwear roller 3 having an elastic surface. The water base roller 5 is immersed in water stored in a water cannon 7, and the transfer roller 6 is driven separately from the printing machine by a motor 9 via a transmission mechanism 8. Each roller is designed to rotate in the directions of arrows B, C, and D, but the rotation directions of the contact surfaces of swimsuit roller 3 and transfer roller 6 are opposite to each other in order to transfer water smoothly. . FIG. 2 is a configuration diagram of an attachment/detachment device for attaching/detaching contact between the swimsuit roller and the transfer roller. In the figure, a pin shaft 13 is fixed to the tip of a lever 12 that is rotatably provided with respect to the rotation shaft 11 of the transfer roller 6, and a lever 14 is rotatably provided on this pin shaft 13. A rotating shaft 15 of the swimsuit roller 3 is rotatably supported at one end of the lever 14. 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 in the direction of the arrow. Due to the force of this spring 16, the swimsuit roller 3 is attached to the transfer roller 6. A piston rod of a cylinder 17 is connected to the lever 14 as attachment/detachment means. 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, cylinder 1
When lever 7 operates and the piston rod retracts, lever 1
2 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 a detached state. When it has rotated to a certain extent, press lever 1.
2 stops against the stop pin 18, the lever 14 now rotates about the pin shaft 13 against the spring 16, and the swimsuit roller 3 is further separated from the transfer roller 6. When the cylinder 17 is activated and the piston rod is extended, the piston rod operates in the reverse order as described above, and the swim roller 3 is placed on the transfer roller 6 and then on the plate cylinder 1. Here, the rotating shaft 11, levers 12, 14, pin shaft 13, stop pin 18, and cylinder 17
During the unloading operation, the contact state between the swimsuit roller and the transfer roller is removed after the contact state between the print cylinder and the swimsuit roller is removed, and during the loading operation, the contact state between the swimsuit roller and the transfer roller is removed, and then the contact state between the swimsuit roller and the transfer roller is removed. An attachment/detachment means is configured to bring the swimsuit roller into contact with the swimsuit roller. Further, the rotating shaft 19 of the water base roller 5 is supported by a bearing 20 formed eccentrically thereto, and by rotating this bearing 20 by an adjustment means (not shown), the water base roller 5 is rotated relative to the transfer roller 6. The contact pressure can be adjusted. In addition, 21 is a water supply pump for supplying water to the water boat 7. In the water supply device having such a configuration, various problems occur if the water source roller 5 is rotated and the swimsuit roller 3 and transfer roller are arbitrarily attached and detached. In other words, if the water base roller rotates when there is no water in the water boat, the water base roller and transfer roller will rotate without any water film on the contact surface, and the friction coefficient of that contact surface will increase. Even the slightest slip can damage the hydrophilic elastic surface of the head roller. In addition, if the swimsuit roller touches the transfer roller when there is no water film on the surface of the transfer roller, the surface of the swimsuit roller may be damaged because the friction coefficient of the contact surface is large and the rollers are rotating in opposite directions. Furthermore, the ink that has adhered to the bathing roller from the printing plate is transferred to the transfer roller and then adheres to the fountain roller, staining them. Also, in such a situation,
A large load is applied to the motor that drives the transfer roller and water source roller, resulting in an accident in which the motor burns out. The present invention has been made in view of these points, and its purpose is to prevent damage to each part by driving the rotation of the water head roller and the attachment/detachment of 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 the above problems. Hereinafter, the present invention will be explained in detail with reference to the drawings. 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, turn on the select switch SS as shown in the diagram.
When the main unit of the printing machine such as the plate cylinder rotates in this state,
The rotary relay of the machine (not shown) operates, and relay contact r, which is on when the machine is stopped, turns off. Here, when switch S is turned on, the water supply relay is activated.
_R1 operates and relay contact _r1 turns on, and
This operation causes the water supply pump 21 shown in FIG. 2 to operate, and water is supplied to the water boat 8. Next, press push button switch A ₁ for driving the water head roller to turn it on.
Since relay contact r ₁ is already on, relay R ₂ for driving the water head roller operates, and relay contact r ₂₁ ,
r ₂₂ turns on and relay contact r ₂₃ turns 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 rotates the motor 9 shown in FIG. Ru. Note that when the push button switch _B1 for stopping the water head roller is pressed to turn it off, the self-holding of the relay _R2 is released and the rotation of the water head roller is stopped. That is, switch S, relay R ₁ for water supply, relay contact r ₁ of this relay R ₁ , push button switch A ₁ for driving the water base roller, relay R ₂ for driving the water base roller, and this relay R ₂ . Mizifune 7 by relay contact r ₂₁ for self-holding
A first circuit is configured to rotationally drive the water source roller 5 under the condition that water is supplied into the water source. In addition, timer relay T is activated by turning on relay contact _r22 .
After a certain period of time, timer contacts t ₁ and t ₂ are 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 transfer roller. Next, the push button switch for wearing swimsuit rollers.
When A ₂ is pressed to turn on, timer contact t ₁ is on, so relay R ₃ for driving the attachment/detachment means operates.
Relay contact _r3 turns on and its operation is self-maintained. Due to the operation of this relay _R3 , the cylinder 17 shown in FIG.
I will be wearing it. When the push button switch _B2 for removing the swimsuit roller is pressed to turn it off, the self-holding of the relay R3 is released and the swimsuit roller ₃ is released from the transfer roller 6. Here, the timer contact _t1 constitutes a second circuit that enables the attachment/detachment means to operate by means of a timer output when the select switch SS is turned on in the upper position during printing work. Thus, during printing work, the operation commands and conditions have a relationship as shown in Table 1 below.

[Table] Note that the ○ mark indicates that the conditions were satisfied. Even if one of these conditions is missing, the operation will not be performed. Next, when adjusting the nip pressure between the rollers, switch the select switch SS to the position shown below. When the switch S is turned on in this state, 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 and the relay contact _r23 is turned off. relay contact r ₂₁
When relay R ₂ is turned on, relay R 2 is self-held, and when relay contact r ₂₂ is turned on, timer relay T is activated, and after a certain period of time, timer contacts t ₁ and t ₂ are turned on. Here, when push button switch A ₂ for putting on the swimsuit roller is pressed to turn it on, timer contact t ₂ is on, so relay R ₃ is activated and the swimsuit roller is put on.
At the same time, relay contact _r3 is turned on and the operation of relay _R3 is self-maintained. In this case, when relay R ₂ is not operating, timer relay T is not operating, the water head roller is stopped, and the machine is not rotating, both relay contacts r and r ₂₃ are turned on. Therefore, even if the timer contact _t2 is off due to the inoperation of the timer relay T, the relay _R3 operates. Then, the operation of relay _R3 is self-maintained by turning on relay contact _r3 . When the swimsuit roller removal pushbutton switch _B2 is pressed to turn off, the self-holding of the relay _R3 is released and the swimsuit roller is removed from the transfer roller. Here, the timer contact t2 constitutes a third circuit that enables the attaching/detaching means to operate by means of a timer output when the select switch SS is turned on during nip pressure adjustment work. In addition, relay contacts r and r23 are used to enable the attaching and detaching means when the water head roller is stopped and the printing press is stopped when the select switch SS is turned on in the lower position during nip pressure adjustment work. A fourth circuit is configured. Thus, during adjustment work, the relationship between operations and conditions when an operation command is given is as shown in Table 2 or 3 below.

【table】

[Table] If even one of these conditions is missing, the operation will not be performed. 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 6 and the water base roller 5. This nip pressure adjustment work is
For example, this is done in the following way. (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 checking 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 swimsuit roller 3 and the transfer roller 6, it is necessary to make sure that the water base roller 5, which is in constant contact with the transfer roller 6, is stopped, and that the swimsuit roller 3 is not in contact with the plate cylinder. The condition is that the machine is not rotationally driven by the rotation of step 1, in other words, that the machine is stopped. That is, in Fig. 3, the select switch SS is turned on in the lower position, the timer contact _t2 is off, and the water head roller drive relay _R2 is inoperative, so the water head roller drive relay _R2 is turned off. Contact r ₂₃ is on,
Only when the condition that relay contact r is on because the machine is stopped is met, when push button switch A ₂ is turned on, the attachment/detachment means is driven and swimsuit roller 3 and transfer roller 6 are connected. will be worn. On the other hand, in the roller rotation adjustment method, when adjusting the nip pressure between the rotating swimsuit roller 3 and the transfer roller 6, it is necessary to adjust the nip pressure between the rotating swimsuit roller 3 and the transfer roller 6 only after water is sufficiently supplied to the swimsuit roller 3 by the water base roller 5. For example, it is necessary that the water base roller 5 rotates under the condition that water is supplied into the water boat 7 and that the swimsuit roller 3 and the transfer roller 6 are brought into contact only after a predetermined period of time. If this condition is not met and the swimsuit roller 3 and transfer roller 6, which rotate in opposite directions, become stuck, both rollers will be damaged as described above. That is, by turning on the push button switch _A2 only when water is supplied to the water boat 7 and the timer contact t2, which turns on after a predetermined time as the water base roller ₅ rotates, turns on the attachment/detachment means. is driven, and the swimsuit roller 3 and transfer roller 6 are placed on the swimsuit. In addition,
At this time, the water head roller 5 is being driven, so
Relay contact _r23 is off, and only the timer contact _t2 is enabled. 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 roller attaching/detaching device, and Fig. 3 is an embodiment of a water supply device for a printing press according to the present invention. It is a circuit diagram. 1... Plate cylinder, 2... Ink forming roller, 3... Swimsuit roller, 5... Water source roller, 6... Transfer roller, 7... Water boat, 9... Motor, 17... Cylinder, 21... Water supply pump, SS... Select switch, _R1 ...Water supply relay, _R2 ...Water roller drive relay, _R3 ...Swimsuit roller attachment relay, T...Timer relay.

Claims (1)

[Scope of Claims] 1. A swimsuit roller that rotates in contact with the plate cylinder, a transfer roller that contacts the swimsuit roller and rotates so that its contact surfaces face in opposite directions, and a transfer roller that contacts the transfer roller and rotates so that its contact surfaces face in opposite directions. A water roller that is supported so that its contact pressure can be adjusted and has a part of its circumferential surface disposed inside the water boat;
During the unloading operation, the contact state between the print cylinder and the swimsuit roller is removed, and then the contact state between the swimsuit roller and the transfer roller is removed, and during the loading operation, the contact state between the swimsuit roller and the transfer roller is changed to "clothing", and then the contact state between the print cylinder and the swimsuit roller is removed. A water supply device for a printing press, comprising an attachment/detachment means that brings the rollers into contact with each other, and supplies water from the water barrel to the plate cylinder while the rollers are in contact with each other, the water supply device supplying water to the water barrel. a first circuit that rotationally drives the water head roller when the water head roller is in the state, a select switch that selects either the first or second connection state, and a tamper output after the water head roller rotates and a predetermined time elapses. a second circuit (t1) for enabling the attachment/detachment means to operate by means of the timer output when the select switch is in the first connection state during printing operations; a third circuit (t2) that enables the attaching/detaching means to be operated by the timer output when the select switch is in the second connected state; a fourth circuit (r23,
r) Water supply device for a printing press.