JPH01174447A - Ink pump controller - Google Patents

Abstract

PURPOSE:To simplify a mechanism and to enhance the adjusting performance and operating reliability in supplying ink by providing a generating circuit outputting a printing speed and printing density dividing ratio pulse signal, a gate circuit and an AND circuit which output a pulse control signal, and a pulse motor. CONSTITUTION:Respective data of a printing speed 30a, a printing density 30b, and a printing ratio 30c, which are corresponding to a printing, are inputted to a CPU 31. According to the calculation of the data, a printing speed and printing density dividing ratio signal 31a and a printing ratio dividing ratio signal 31b are outputted, and in a generating circuit 32 the printing speed and printing density dividing ratio signal 31a is outputted as a printing speed and printing density dividing ratio pulse signal 32a. In a gate circuit 33 and an AND circuit 34, a pulse control signal 34a is outputted on the basis of the printing speed and printing density dividing ratio pulse signal 32a and the printing ratio dividing ratio signal 31b. By being controlled by a pulse motor 36 according to this signal, the drive of an ink pump 37 is quantatively controlled, whereby an ink supply amount is automatically controlled correspondingly to the respective data of the printing speed 30a, the printing density 30b, and the printing ratio 30c.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides ink supply devices for various printing presses that are capable of controlling the printing speed (M/C speed), printing density, and streak rate (printing area) corresponding to the printing plate. The present invention relates to an ink pump control device characterized in that it controls the ink discharge pattern based on each data (rate).

(Prior Art) Conventionally, the amount of ink supplied to a printing press has to correspond to the pattern distribution in the width direction of the printing plate, and also to the printing speed, so that the amount of ink supplied is commensurate with the amount of ink required for these. In addition, it is required that the density be arbitrarily adjusted to a desired density at any time during printing, regardless of the pattern.

Therefore, the ink supply device has conventionally adopted a system in which a large number of variable discharge amount plunger pumps are arranged in parallel in the axial direction of the ink roller, and in this conventional example, the ink supply amount can be adjusted by adjusting the pump stroke. There are two types: one that uses a fixed stroke and a through-hole method to adjust the ink supply amount.

The stroke regulation method and the swash plate method have been put into practical use as the pump stroke adjustment types, both of which open the suction valve and close the discharge valve during suction, and open the suction valve and open the discharge valve during discharge. The structure is such that both valves are closed near the switching between suction and discharge.

The above fixed stroke, through-hole method! For l″f1 type,
A constant stroke plunger pump (15) having the basic structure shown in Fig. 6.7 is applied, and the pump (15) has an oblique groove (2) in the upper part of the plunger (1). ? lI (2m
) to connect with the top surface of the plunger, and connect it to the top surface of the plunger as shown in Figure 7 (a), (b),
C) Full injection (A is bottom dead center, mouth is injection ji7i, C is injection end), (D) (E) is 1/, injection (2 is bottom dead center, E is injection start), (to) There will be no injection, and the plunger (1
) reaches the bottom dead center due to spring (3), Fig. 6 (B)
, as shown in Figure 7 (a), the ink enters the ink inlet (4a) →
The chamber (5) → flows into the sleeve (7) through the hole (6) and 1
．． When the plunger (1) is raised by a cam (not shown) and the hole (6) and through hole (8) are closed as shown in Fig. 7 (b), ink discharge starts from the discharge port (4b). , 1. When the 1-land gear (1) rises to the position shown in Fig. 7 (c), the diagonal m
(2) passes through the through hole (8), and the ink is returned to the suction side and the discharge is stopped.

Furthermore, when the 1-land gear (1) is rotated as shown in FIG.
1) to the position shown in Fig. 7 (to), the vertical thread (2a) and the through hole (8) always communicate with each other, and no ink is ejected.In Fig. 6 (A) (I3), the rack gear (9) ),gear(
When the cylinder (11) is rotated at step 10), the horizontal plug (13) of the plunger (1) is fitted into the notch (12) at the lower end of the cylinder (11), and the plunger (1) is rotated regardless of reciprocating motion. (11
), it has a structure that rotates with the

The control of the ink supply amount by the ink supply device is performed in the eighth step.
As shown in the figure, power is supplied from the drive device of the printing press body via a speed reducer to a sprocket (21), a one-way clutch (22), a drive shaft (23), and a gear (24).

(25), (26), the camshaft (27) transmits the information, and the cam (28) reciprocates the plunger (1) [has a rough interlocking am, and is proportional to the printing speed (M/C speed). The reciprocating motion of the 1 rungeer (1) is performed, and the adjustment of the ink supply l of each pump to the pattern distribution, etc. is determined by the individual pump stroke (the effective stroke is the IIJ! 1, resulting in complicated adjustment operations for each version change.

(Problems to be Solved by the Invention) What is the conventional ink supply device? Each ink pump with a coarse interlocking speed is proportional to the printing speed. l!
The adjustment of the ink supply amount corresponding to the pattern distribution etc. is done by the operator's manual setting, which creates a complicated process for each plate. There are problems such as the need for 1 ti production, which is a factor in lowering the operating rate.

(Means for Solving Problems) The present invention is an ink pump control device developed to solve the above-mentioned problems. a central processing unit that outputs a printing speed/printing density frequency division signal and a printing density frequency division signal; and a central processing unit that inputs the printing speed/printing density frequency division signal and generates a printing speed/printing density frequency division pulse signal. an oscillation circuit that outputs a pulse control signal; a gate circuit and an AND circuit that input the printing speed/print density frequency division signal and the coverage ratio frequency division signal and output a pulse control signal; The configuration includes a pulse motor for the ink pump that is controlled via a drive circuit, and the central processing unit, oscillator circuit, AND circuit, etc. A control signal with the number of pulses corresponding to the data is obtained, and the ink pump is driven by controlling the pulse motor using the pulse control signal, thereby simplifying the mechanism and controlling the ink supply T.
Improved A-alignment performance and operational reliability.

(Function) The printing speed, printing density, and stroke rate data corresponding to the printing plate are input to the central processing unit, and the central processing unit calculates the printing speed/printing density division ratio signal and the stroke rate. The frequency ratio signal is output, and the oscillation circuit outputs the printing speed/printing density frequency division ratio signal as a printing speed/printing density frequency division ratio pulse signal, and the gate circuit and the AND circuit output the printing speed/printing density frequency division ratio signal. A pulse control signal based on the pulse signal and the printing ratio dividing ratio signal is output, and the ink pump is controlled for quantification by controlling the pulse motor using the pulse control signal, and each of the printing speed, printing density, and printing ratio is controlled. The ink supply amount is automatically controlled according to the data.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 to 5, and (
31) is a central processing unit (computer, CPU), (32
) is the oscillation circuit, (33) is the gate circuit, (34) is the AN
D circuit, (35) is a drive circuit, (36) is a pulse motor, (37) is an ink pump, and a central processing unit (31)
), print speed (machine speed, M/C speed) data (30a) and print density data (30b) corresponding to the printing plate.
and printing area ratio data (30c) are input, and the frequency division ratio necessary to generate a clock corresponding to the printing speed data (30a) and printing density data (30b) is calculated. Print speed/print density division ratio signal (
31a) to the oscillation circuit (32),
The image ratio division ratio signal (
31b) to the gate circuit (33).

The oscillation circuit (32) receives a basic clock generated by a high frequency oscillator (32G), and uses a frequency dividing function (programmable counter) to divide the printing speed and print density corresponding to the desired print speed and print density. Frequency ratio pulse signal (32
m) output to the gate circuit (34) and AND circuit (35).

The gate circuit (33) compares the printing speed/printing density division ratio pulse signal (32a) and the coverage ratio division ratio signal (31b) and selects the gate width signal (33a) at the maximum coverage ratio.
is output to the AND circuit (35).

The AND circuit (34) performs pulse control corresponding to each data of printing speed, printing density, and drawing ratio as a logical product of the printing speed/printing density frequency division ratio pulse signal (32m) and the gate width signal (33a). The drive circuit (
35).

The drive circuit (35) is a drive circuit for the pulse motor (36) of the ink pump (37), and controls the pulse motor (36) by inputting a pulse control signal (34m). Ink pump (3)
)) is driven and controlled to a desired ink ejection amount corresponding to each input data (30m), (30b), and (30c) of printing speed, printing density, and streak rate.

The pulse motor (36) is an 81-degree motor that rotates by a rotation angle corresponding to the number of pulses of the input signal, and the ink pump (3) is a gear pump, screw pump, vane pump, etc. Rotary pumps are applied. The control is a control device for a large number of ink pumps arranged in parallel.

The embodiment of the present invention has the above-mentioned configuration, and to explain the operation in detail, the printing speed (M/C speed) data (30a) is used as the printing density data in order to output an output proportional to the device speed. (30b) is the drawing rate data (30c) in order to correspond to the printing solid density required by the operator.
is input to the central processing unit (31) in order to correspond to the printing area ratio of the picture, and the drawing ratio data (30c
) may be set manually by the operator or may be set using a coverage rate measuring device.

The central processing unit (31) (computer) calculates as described above based on the input of the data (30a), (30b), and (30c), and generates printing speed/printing density division ratio signals (31a) corresponding to the data (30a), (30b), and (30c). Image rate division ratio signal (
31b), and the oscillation circuit (32) receives the basic clock generated by the high frequency oscillator (320), and outputs the signal according to the printing speed and printing density based on the printing speed/printing density division ratio signal (31m). The basic clock is frequency-divided, and a printing speed/printing density frequency division ratio pulse signal (32a) of an appropriate frequency (pulse signal) is output.

The gate circuit (33) and the AND circuit (34) select the number of pulses according to the drawing rate, and the gate signal is usually set at the maximum drawing rate (for example, 00 pulses at 60% in newspaper printing). As the number of pulses, only the pulses corresponding to the drawing ratio are valid (for example, when the drawing ratio is 15%, 15 pulses are used),
This effective number of pulses is transmitted to the pulse motor (3B) (stepping motor), and the pulse motor (36) rotates by an angle commensurate with the number of pulses.
) and the ink pump (3)) are connected via, for example, a gear transmission mechanism and are constantly driven and controlled. Pump discharge IL/
Assuming that the pulse is 0, the number of pulses is P, the constant determined by the print density is 1, the constant determined by the pump characteristics is 2, the device speed coefficient is j, and the drawing rate coefficient is Si, then the required The ink amount Q1 is Qi=Ko ・r'=lK bi (Kz ・
Vj) - Calculated by Si, arithmetic circuit,
The rotation control circuit, which includes a gate circuit, a pulse motor, etc., makes it possible to control the ink discharge amount by quantifying it. Oscillation frequency of the pulse control signal 1. The ink discharge amount is obtained as the characteristics shown in FIGS. 3 to 5, and the ink discharge amount is excellent!
l! It has improved stability and reliability.

(Effects of the Invention) The present invention has the above-described configuration, and includes inputting each data of printing speed, printing density, and streak rate corresponding to the printing plate to the central processing unit, and controlling the printing speed by the central processing unit.・Output of printing density frequency division ratio signal and image ratio frequency division ratio signal (31b), output of printing speed/printing density frequency division ratio pulse signal of oscillation circuit, printing speed/printing density frequency division by gate circuit and AND circuit Theory of ratio pulse signal and gate width signal F1! By outputting the pulse control signal as a product, the pulse control signal becomes a signal with a number of pulses commensurate with the printing speed, printing density, and streak rate, and each ink pump is controlled only by the number of pulses of the pulse control signal. , excellent ink discharge amount quantified by a relatively simple mechanism! I! I'Mi performance is obtained and operational reliability is significantly improved.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that the design may be modified in any way without departing from the spirit of the present invention. It is.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an ink pump control device showing an embodiment of the present invention, Fig. 2 is a functional explanatory diagram of the ink supply control shown in Fig. 1, and Fig. 3 shows printing speed (M/C speed) and printing. Figure 4 is a graph showing the relationship between density and oscillation frequency, Figure 4 is a graph showing the relationship between printing speed, print rate, and discharge amount, Figure 5 is a graph showing the relationship between print rate, printing speed, and discharge rate, and Figure 6 (A ) (B) is an overall perspective view and an enlarged longitudinal cross-sectional view of the main parts of a conventional constant stroke plunger pump, with a partial cross-section;
are each stroke diagram in FIG. 6, and FIG. 8 is a sectional view taken along the line m of the interlocking mechanism of the conventional example. 31: Central processing unit 32: Oscillation circuit 33: Gate circuit 34: AND circuit 35: Drive circuit
36: Valse motor 37: Ink pump agent Patent attorney Shige Okamoto 2 people outside the kiln Figure 6 Figure 7

Claims (1)

[Claims] a central processing unit that calculates based on each data input of printing speed, printing density, and drawing rate and outputting a printing speed/printing density frequency dividing signal and a drawing rate dividing signal;
an oscillation circuit that inputs a print density frequency division signal and outputs a printing speed/print density frequency division pulse signal; An ink pump control device comprising: a gate circuit and an AND circuit that output a pulse control signal; and a pulse motor of an ink pump controlled by the pulse control signal via a drive circuit.