JPH0694212B2 - Water supply adjustment device for printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field The present invention achieves elimination of hickeys and reduction of ghosting by making the surface speed of a swimsuit roller different from the surface speed of a plate cylinder. The present invention relates to a moisturizing device for a lithographic printing machine devised as described above.

(Prior Art) and (Problems to be Solved by the Invention) Conventionally, in a water supply adjusting device of a printing machine of this type, the peripheral speed of the swimsuit roller is made slightly slower than the peripheral speed of the plate cylinder to remove the hickies. It has been known that the ghost is reduced, but this is to reduce the peripheral speed of the swimsuit roller by a fixed amount by using a motor for driving the printing machine main body as a power source and via a gear and a mechanical clutch. As a result, vibration may occur due to the impact when the clutch is engaged or disengaged, and good printing may not be possible, and the degree of slowing down the peripheral speed of the swimsuit roller may not be stepless. It is impossible to increase or decrease it in a region where the surface speed of the swimsuit roller is higher than the surface speed of the plate cylinder simply because it is not used and the speed is not sufficiently high. And also The contact state between the swimsuit roller and the plate cylinder changes abruptly when the clutch is engaged or disengaged, so that the plate surface is liable to be damaged or reduced (edge), and the abrupt change causes the printing machine body to be driven. There were defects such as a load on the motor and troubles with the weight feeder adversely affect the motor.

It is an object of the present invention to provide a moisturizing device for a lithographic printing machine that eliminates such defects.

(Means for Solving the Problems) In order to achieve the above-mentioned object, it is possible to drive by a motor which is intermittently transmitted and controlled by engagement / disengagement of a clutch, and in the disengaged state of the clutch, a plate cylinder is provided. The speed of the above-mentioned motor is based on the swimsuit roller that is always driven by the contact pressure with the swimsuit roller and is in constant contact with the plate cylinder, and the speed command of the amount of any slip amount added to the speed of the plate cylinder. If the difference between the peripheral speed of the swimsuit roller and the peripheral speed of the plate cylinder is within the specified range, including the zero value, plus value and minus value, the engagement state is set, and the speed control circuit that controls the engagement state is set otherwise. And an electric control circuit for the clutch capable of forming a disengaged state, respectively.

(Embodiment) In the first embodiment shown in FIG. 1, a water source roller 2 rotating in a water tank 1, a water transfer roller 3 interlocking with the water source roller 2, a water draining roller 4 interlocking with the water transfer roller 3, Water transfer roller 3
And the swimsuit roller 6 in contact with the plate cylinder 5, the bridge roller 8 in contact with the swimsuit roller 6 and the ink roller 7, and the water source roller 2 is an encoder 10. The geared motor 11, the inverter 12, the water source roller speed command dial 13, and the water source roller speed indicator 14 control the swimsuit roller 6 to engage an electric clutch (a clutch operated by electric energy: an electromagnetic clutch, for example) 15. Driving by a geared motor 17 with an encoder 16 that is intermittently transmitted / controlled by engagement / disengagement is enabled via an inverter 18, etc., and the plate cylinder 5 is in the disengaged state of the clutch 15.
Sliding amount command dial 19 enables driven rotation drive by contact pressure with
And the speed of the geared motor 17 is controlled by adjusting the speed via the mixer 20, and the electric clutch 15 has a zero value and a positive value (+ 10%) in the difference between the peripheral speed of the swimsuit roller 6 and the peripheral speed of the plate cylinder 5. ) And a negative value (-10%) are within the specified range, the engaged state is indicated, and otherwise the disengaged state is indicated respectively by the slip amount instruction dial 19, the slip amount indicator 21, the encoder 16 , Inverter 18, comparison circuit 22, arithmetic circuit 23, clutch automatic ON
An OFF circuit 24 and a clutch manual ON / OFF switch 25 are formed to form the water source roller speed command in the first embodiment.
When set at 13, the input is transmitted to the inverter 12, and the geared motor 11 rotates at the set speed to rotate the water source roller 2. The greater the number of rotations of the water source roller 2, the more water will pass through the water transfer roller 3 and the swimsuit roller 6, and more water will adhere to the plate cylinder surface. On the other hand, the encoder 10 detects the rotation speed of the geared motor 11 and feeds back the rotation speed to the inverter 12, and the inverter 12 constantly compares the rotation speed with a speed set value, and a stable rotation according to the set value is performed. 11 and the stable rotation speed is always given to the water source roller speed indicator 14 for display.

When the slip amount command dial 19 is set, the set amount and the plate cylinder rotation speed Nm are calculated, and the speed command is output from the mixer 20 and input to the inverter 18. The geared motor 17 rotates at the command speed to rotate the swimsuit roller 6 at the command speed via the clutch 15. On the other hand, the encoder 16 constantly detects the rotation speed of the geared motor 17 and inputs it to the inverter 18. The inverter 18 gives the geared motor 17 stable rotation at the rotation speed according to the speed command, and at the same time outputs the speed output Nn and the plate cylinder rotation speed. Nm is calculated by the comparison circuit 22 and the calculation circuit 23, and the result of the calculation is given to the clutch automatic ON / OFF circuit 24 and the slip amount indicator 21, and the clutch automatic ON / OFF circuit 2
The electric clutch 15 automatically disconnects the geared motor 17 and the swimsuit roller 6 to protect the plate surface of the plate cylinder 5 when the calculation result given to 4 is a certain amount of plus or minus. .

The second embodiment shown in FIG. 2 is a little different from the first embodiment in that the swimsuit roller 6 is controlled by program control, but the other parts have substantially the same structure and are therefore the same as the same parts. A reference numeral is given and detailed description thereof is omitted.

That is, in the second embodiment, the geared motor 17 rotates the swimsuit roller 6 at the programmed speed when the speed command from the speed commander 26, which is programmed in advance according to the printing conditions, is input to the inverter 18. On the other hand, the encoder 16 always detects the rotation speed of the geared motor 17 and outputs the detection result to the inverter.
The stable rotation of the program speed fed back to 18 is given to the geared motor 17 and the rotation speed output by the encoder 16 is displayed on the display 21, and the rotation speed Nm of the plate cylinder 5 detected by the encoder 5'and the inverter 18 The speed output Nn is calculated by the calculation circuit 23 and the result of the calculation is given to the clutch automatic ON / OFF circuit 24 to automatically turn the clutch ON.
The clutch 15 automatically disconnects the geared motor 17 from the swimsuit roller 6 to protect the plate surface of the plate cylinder 5 when the calculation result given to the OFF circuit 24 is equal to or greater than a certain plus or minus value. It is the one.

(Operation) and (Effect of the Invention) The present invention enables driving by a motor whose intermittent transmission is controlled by engagement / disengagement of the clutch, and in the disengaged state of the clutch, driven rotation by contact pressure with the plate cylinder. A swimsuit roller that can be driven and is always in contact with the plate cylinder, and a speed control circuit that controls the speed of the motor based on a speed command of an amount obtained by adding or subtracting an arbitrary slip amount to the speed of the plate cylinder, If the difference between the peripheral speed of the swimsuit roller and the peripheral speed of the plate cylinder is within the specified range including zero value, plus value and minus value, the engaged state is formed, otherwise the disengaged state is formed. The electric control circuit for the clutch is provided, that is, the peripheral speed of the swimsuit roller can be arbitrarily set to be higher or lower than the peripheral speed of the plate cylinder by electric means without any step. And the expected It has an excellent effect that the objective can be sufficiently achieved, and since the drive motor for the swimsuit roller is independent of the main motor of the printing press main body, it does not directly give a load to the main motor. , Not only has the advantage of not adversely affecting the main motor from the humidifying device, but it is also possible to manage the relationship with the plate surface that controls the swimsuit roller remotely, which is ideal for performing the best printing. It has a practical effect.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing a first embodiment of a moisturizing device for a printing machine of the present invention, and FIG. 2 is an overall system diagram showing the same second embodiment. 1 ... Water tank, 2 ... Mizumoto roller, 3 ... Water transfer roller,
4 ... Draining roller, 5 '... Encoder, 5 ... Plate cylinder,
6 …… Swimsuit roller, 7 …… Ink roller, 8 …… Bridge roller, 10 …… Encoder, 11 …… Geared motor, 12 …… Inverter, 13 …… Water source roller speed command dial, 14 …… Water source Roller speed indicator, 15 …… electric clutch, 16 …… encoder, 17 …… geared motor, 18 ……
Inverter, 19 …… Slip amount command dial, 20 …… Mixer, 21 …… Slip amount indicator, 22 …… Comparison circuit, 23 ……
Arithmetic circuit, 24 …… Clutch automatic ON / OFF circuit, 25 …… Manual ON / OFF switch, 26 …… Speed command device.

Claims (1)

[Claims] Claims: 1. It is possible to drive by a motor whose intermittent transmission is controlled by engagement and disengagement of a clutch, and when the clutch is disengaged, driven rotation can be driven by contact pressure with a plate cylinder. A swimsuit roller that is in constant contact with the plate cylinder,
A speed control circuit for controlling the speed of the motor based on a speed command of an amount obtained by adding or subtracting an arbitrary amount of slip to the speed of the plate cylinder, and the difference between the peripheral speed of the swimsuit roller and the peripheral speed of the plate cylinder is zero, plus A printing machine, comprising: an electric control circuit for the clutch, which is capable of forming an engaged state when the value is within a predetermined range including a negative value and a negative value, and a disengaged state when the value is other than the predetermined value. Humidifier.