JPH0234337A - Ink feeder - Google Patents

Abstract

PURPOSE: To supply an ink of a sufficient amount to respective printing columns by pulse injection of the ink to an ink roller. CONSTITUTION: An ink from a supply unit 12 is supplied to a gear pump 15, and continuously pumped into a conduit 18. Valve means 20 independent at the respective columns are installed. The means 20 has a position for the ink to pass toward a rail and a position for the ink to be returned to a supply manifold via a bypass 25. The means move by switching between the two positions in a predetermined frequency for a predetermined time interval.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an ink supply device used for printing publications, in which the ink supply is determined as a function of the ink occupancy required for a given column of the printed matter. The present invention relates to an ink supply device that is controlled as follows.

[Prior art] Normally, 77 pieces of ink are obtained from the ink reservoir of a paper-fed printing machine>
-r>o- is supplied to the fountain roller. The fountain roller is a duct roller (dtlctor) that sends ink to the remaining ink train rollers.
roller). BACKGROUND OF THE INVENTION Providing ink to a printing press, especially one using lithography, is a difficult task, but one that is extremely important for producing good prints. The oil-based inks used in offset 6-plate printing are very viscous and in most cases are markedly plastic rather than fluid. Because of these physical properties of ink, ink is supplied to plate rollers through a roller array to reduce viscosity and form a uniform ink film on the plate.

Until now, the amount of ink applied to the fountain roller was
It was regulated by a blade that formed one wall of the ink reservoir. The free end of this blade can be adjusted manually or using a motor-operated adjustment screw. This type of equipment typically has a main ink applicator roller (key ink applicator).
ed 1nker), which allows the amount of ink delivered to each printing column to be adjusted across the width of the plate roll.

More recently, separate gear pumps have been used to supply ink to the ink rail. These gear pumps are mounted directly to the ink rail for each printing column. An ink supply device of the type shown in U.S. Pat. No. 4,281,597 varies the amount of ink supplied to each column by varying the speed of a drive motor that operates a gear pump associated with each printing column. is being adjusted. Adjustment of motor speed can be done manually or automatically. Another type of primary inking roller using a pump or piston to supply ink to an ink roller via a suitable dispensing nozzle is disclosed in U.S. Pat.
, No. 981.182, No. 2,081,906@, No. 3,
No. 207.070 and No. 2,130,659.

SUMMARY OF THE INVENTION A principal object of the present invention is to provide a printing press ink supply system that provides significantly better control of ink than those of the prior art.

Another object of the invention is to provide a printing press ink supply device with a reduced number of parts.

Still another object of the present invention is to provide a printing press ink supply system capable of supplying a sufficient amount of ink to each printing column by pulsing ink to an ink roller.

Other objects and advantages of the present invention will be apparent from the following description in conjunction with the accompanying drawings.

[Example] To understand the ink supply device of the present invention in more detail, reference is first made to FIG. 1 of the drawings. In FIG. 1, reference numeral 10 indicates a printing roller. This printing roller is generally known as the first roller in the printing roller row. The device itself, indicated generally by the reference numeral 11, comprises an ink supply 12 which is connected to a supply tube manifold 13. The supply vibrator 14 coming out of the manifold 13 is connected to the inlet side 1 of the positive displacement ink feed pump means 15.
Ink is being sent to 6. Pump 15 is shown here as a gear pump. This gear pump is a type of pump particularly suitable for transporting highly viscous printing inks. Typically, printed materials such as daily newspapers have a plurality of printed columns, the exact number of which is determined by the size of the newspaper and whether the printing press is single-column wide or double-column wide.

In this way, the manifold 13 is used to supply ink to the plurality of pump means 15. These plurality of pump means are consecutively arranged in parallel to the manifold 13. From the outlet side 17 of the pump means 15, a conduit or pipe 18 delivers ink to the valve means 20. The valve means 2o is operable via a suitable actuation mechanism. This operating mechanism uses a solenoid 21 in the illustrated example. 'The valve means 20 is provided with ink bypass means. This ink bypass means is shown as conduit 25 in this example. For purposes of illustration, ink is returned to manifold 13 through conduit 25 when the valve is in the "off" position, for example. In the other position, ie, "on", the valve is adapted to deliver ink to the ink rail 30 through the ink conduit means 26. The ink rail 30 supplies ink to a plurality of columns that require printing by plate rolls.

The ink supply system operates by supplying ink from an ink supply 12 to a series of gear pumps 15, which continuously pump ink into a conduit 18. One valve means 20 is installed independently for each column. These valve means are controlled by a block labeled ``Inputs from the mid-column machine control system''. This device is manual &! 1 ml of ink can be flowed into the ink rail for a predetermined period of time through each valve, or the υrm can be run through an optical reader.
You can also. An optical reader reads the l of ink required to print a column of known print density.

As previously mentioned, each valve means 20 is adapted to essentially move between two operating positions. One of these operating positions is where the ink is passed through towards the rail, and the other operating position is where the ink flow is bypassed.
5 and back to the supply manifold in the position shown in FIG. Depending on the initially set conditions, the valve means can be moved between the two operating positions at a predetermined frequency over a predetermined time interval. For example, if the printing is high-density printing that requires a large amount of ink, υ1
Valve means 20 by @ device (or first manual setting means)
can be left open for a certain length of time. During this time, more ink can be supplied to the ink rails of a given column than would be the case for columns with lower printing densities.

The method of operating this ink supply device is basically a digital control operation that continuously ejects ink and supplies it to the ink roller 10. Upon startup, the device is preset or programmed to repeatedly eject a supply of ink to evenly distribute the ink over the entire surface of the ink roller. This is in contrast to leaving the valve means 20 open for an extended period of time to supply the entire amount of ink required for a given print density.

FIG. 2 shows how ink is supplied to the ink rail as a function of occupancy.

This occupancy rate is expressed by a numerical value N. In the range of occupancy of 50% or more, the time the valve must keep ink flowing in the ink rail is given by the following equation.

'(ON)' T (HIM) I NHere, 'HIM''Required time to keep the valve means open N - Ink occupancy rate ≧50% On the other hand, if the occupancy rate is 50% or less, the valve is closed. The required time is expressed by the following formula.

where: T HIM - the time required to keep said valve means open N - ink occupancy ≦50% The two curves shown in Figure 2 indicate the range from 10% to full occupancy in the dark with the valve open for 0.5 seconds. This figure shows how it is possible to layer ink up to a certain level. The table below shows how to obtain the curve graph and at what point in time when the valve means 2o is in the off state and at 50% occupancy, the valve means is turned on. There is.

4. By using the ink supply device of the present invention, the pulse ratio can be increased by changing the time during which the valve is open. Therefore, the distribution of ink around the ink roller is not constant over a long period of time and is performed with cycle fluctuations, so that the required amount of ink can be supplied. The appropriate amount of ink is supplied to each ink roller as it is fed through the ink roll row, and can be evened out while moving through the remaining ink roll rows. Various changes and modifications can be made within the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the components of an ink supply device according to the present invention. FIG. 2 is a graph showing the characteristics of the ink occupancy effect by the ink supply device as a function of the on/off ratio of the ink flow rate. 10... Printing roller 11... Ink supply device 12... Ink supply body 13... Supply manifold 14... Supply pipe 15... Positive displacement feed pump 18... Conduit 21... ...Solenoid 25...Bypass conduit 26...Ink conduit means 30...Ink rail.

Claims (4)

[Claims] (1) An ink supply device for supplying ink to a printing machine equipped with rollers having a plurality of columns printed simultaneously, the ink supply device comprising: a. an ink supply body; b. an ink supply body; positive displacement ink delivery pump means having an inlet side and an outlet side connected to the supply body; c. an ink outlet located proximate said plate roll and arranged to supply ink to each printing column; an ink rail comprising an orifice; d. ink conduit means connecting an outlet side of said pump means to a respective outlet orifice of said ink rail; e. said ink rail between said pump means and said ink rail; a valve means connected to the conduit means and capable of causing ink to flow from the ink pump means to the rail at a predetermined discharge rate; g. control means for controlling operation of said valve means and delivering ink to said ink conduit means and to said bypass means at a predetermined rate. (2) The ink supply device according to claim 1, wherein the control means includes an optical reading means for emitting a signal representing the printing density of the column, and a flow of ink in response to a signal sent from the optical reading means. and a solenoid actuator attached to the valve means for pulsing the ink. (3) In the ink supply device according to claim 2, the control means opens the valve means and the following equation: T_O_
N=T_M_I_NN/1-N where: T_M_I_N=time required to keep the valve means open N=
An ink supply device capable of flowing ink to the ink rail for a period of time determined from an ink occupancy rate of 50%. (4) In the ink supply device according to claim 2, the control means opens the valve means, and the following equation: T_O_
F_F=T_M_I_N(1-N)/N where: T_M_I_N=time required to keep the valve means open N=
An ink supply device capable of flowing ink to the ink rail for a period of time determined from an ink occupancy rate≦50%.