JPS59127785A - Measuring method of hammer flight time - Google Patents

Abstract

PURPOSE:To enable to accurately monitor hammer flight time even when a hammer voltage is varied, by a method wherein a hammer-driving voltage and a reference voltage in an impact-type printer are compared with each other, and the difference between a driving timing of a hammer-driving means and the timing of hammering a type by a hammer is corrected. CONSTITUTION:A calculating circuit 20 impresses a hammer voltage impressing signal on a converting circuit 15, starts counting by a counter incorporated therein, and triggers a monomultivibrator 28 in accordance with a low-level output fed from the circuit 15 in response to the hammer voltage impressing signal, thereby exciting a magnet 3 through a transistor Tr10. When the hammer 1 strikes a flight time bar 5, the counter in the circuit 20 stops counting, and the hammer flight time is calculated. The hammer flight time is corrected by the circuit 20 in accordance with the result of comparison of the hammer-driving voltage with the reference voltage, and is indicated on an indicator. Accordingly, the hammer flight time can be accurately monitored even when the hammer voltage is varied.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a method for measuring hammer flight time in an impact printing device, and in particular to a method for measuring hammer flight time in an impact printing device, and in particular, to calculate the actual hammer flight time by adding correction to the actual hammer flight time measurement value. Concerning how to calculate and measure.

(2) Background of the Technology In recent years, line printers and various other impact printing devices are required to operate at extremely high speeds. In this case, accurate operation of the hammer is important, but the flight time of the hammer is a function of individual variation factors, operating stroke, and current waveform. The time is set by adjusting the hammer stroke at each step, but if the voltage applied to the hammer drive device such as a magnet fluctuates, the time will increase or decrease under the influence of that change. In order to eliminate this effect, a voltage stabilizer is sometimes installed to stabilize the hammer voltage, but since the hammers in these printers are fired at the time of character verification, many printed digits are verified at the same or close timing. In such cases, the required current becomes large and it is difficult to maintain a constant voltage. In actual equipment, instead of maintaining such a constant voltage, a means of monitoring the voltage and a method of compensating the drive timing of the handles using the voltage are adopted, and even when measuring to adjust to flight time, it is actually Before the hammer starts its movement, a circuit is built into the hammer driving device to give a further lead time, and this lead time is set to a value that compensates for the increase or decrease in the actual hammer flight time caused by the increase or decrease in the hammer voltage. Now, the total time from when the hammer voltage is applied to this circuit until the hammer hits the type (i.e., the time when the above actual hammer flight time and lead time are added) can be calculated as the normal hammer voltage. At least a first-order correction can be made to compensate for fluctuations so that the fluctuations become approximately constant.

However, not only printing devices with operating circuits such as those described above, but also devices without such circuits, devices that are not operating, or magnets alone may be used in factories, fields, etc. for assembly or maintenance purposes. In order to adjust the mechanical operating parts of the hammer, it is necessary to measure the entire actual hammer flight time to be managed in accordance with the above conditions, and in a state that is not affected by fluctuations in the hammer voltage. It is necessary to measure the monitoring amount as equivalent to the hammer flight time at the reference voltage (hereinafter referred to as practical hammer flight time).

(31 Prior Art and Problems) Fig. 1 schematically shows a general impact printing device, in which a hammer 1 supported by a spindle 2 is regulated by a stroke adjustment stopper 27 and shifted to one side in that direction. The ink is attracted by a magnet 3 driven by a transistor 4, and the other end of the hammer 1 strikes a rotating drum 7 on which printed characters are arranged, via a printing paper 8 and an ink ribbon 9.

FIG. 2 shows a conventional measuring means applied to the above-mentioned printing device, which corresponds to the type arrangement position 16 of the drum instead of the printing section (rotary drum 7, etc.) of the printing device. A detection device, ie, a flight time par 5, is set at the striking position of the hammer, and the hammer flight time is measured. A display 6 is connected to the flight time par 5, and from the time when the hammer voltage is applied to the magnet 3 until the hammer 1 rotates in the direction of arrow S in the figure and hits the flight time par 5. time is measured and the measured value is displayed on the display 6.

However, with such conventional hammer flight time measurement methods, only the operating performance of the hammer magnet itself, that is, the actual hammer flight time, is measured. It is not possible to make adjustments including Therefore,
Even if you try to use the values obtained as measured values to adjust the operation timing of the printing magnet, the characteristics of the magnet itself and the characteristics when used in the device do not correspond, resulting in incorrect f.
There was a problem that the f1ii hammer flight time could not be adjusted.

(4) Purpose of the Invention The present invention was made by focusing on such conventional problems, and its purpose is to make it practical even when the hammer voltage changes when measuring the hammer flight time. To facilitate adjustment of the hammer flight time of the hammer means by allowing the hammer flight time to be obtained as a measured value for monitoring and using the measured value as an index for adjustment.

(5) Structure of the Invention In order to achieve the above-mentioned object, the present invention detects the timing at which the hammer strikes the typeface, and detects the timing at which the hammer moving means is driven. Compare the drive voltage when driving the means with the reference voltage, determine the correction time based on this comparison value, and calculate the actual flight time of the hammer measured from the difference in timing between the two above and the correction time. The purpose of the present invention is to calculate the result of the calculation by the calculation means and use it as a monitoring value for adjusting the hammer flight time of each printing magnet constituting the hammer means.

(6) Examples of the invention FIGS. 3 to 7 are diagrams showing one embodiment of the present invention.

Among them, Fig. 3 shows a time change circuit which is a simulator of the voltage time function of the magnet for correcting the operation time by voltage, and calculates the change FIf interval γ (correction time) with respect to the change in the hammer m pressure (denoted as VD). make. In this figure, the inverter 1o is connected to the B terminal where the hammer voltage application signal *B is input.
The bases of the transistors Tr and Tr are connected via the diode 11. Inverter 1o and diode 11
A power supply (NFF, Vcc) is connected between the two and a resistor 12. A hammer voltage V is applied to the collector of the switching transistor Tr through a resistor 132.
While connecting the power supply that supplies D, the resistor R1 and capacitor C3 that form the integrating circuit, and the diode D connected in parallel to this resistor and capacitor C6 are connected. , the capacitor c5, the diode D1, and the transistor Tr constitute the entire charging/discharging circuit.

The output terminal of this light emitting @ circuit, that is, the positive electrode of the capacitor C6, is connected to the inverting input terminal of the operational amplifier OP, which serves as a comparator, and the output terminal of the operational amplifier; Connected to the base of 2. The collector of the transistor Tr2 is connected to a power supply (voltage Vcc) via a resistor 17, and the collector of the transistor Tr2 is used as an output terminal A. Note that the switching transistor Tr, l'I'r2
The emitter of is grounded, and a predetermined reference voltage Vrel serving as a reference for comparison is applied to the non-inverting input terminal of the operational amplifier OPI.

The operation when the application signal *B of the hammer T)L pressure VD as shown in FIG. 4(a) is applied to the B terminal of the time varying circuit 15 will be described. The signal *B is normally at a voltage H, and the base of the transistor Tr1 is held at L by the operation of the inverter 10, and the transistors Tr,
Since the voltage is turned off, the charging/discharging circuit is charged by the hammer voltage VD.

In FIG. 4, at the start point 1 when the hammer voltage is applied. The signal *B changes from H to L, and the transistor T
The base of r changes from L to H, turning it on. Therefore, discharging is started from the capacitor C3 of the discharging/charging circuit via the resistor R1, and the output voltage (■) is determined by the time constant determined by the capacitor C6 and resistor R1 of the charging/discharging circuit as shown in Fig. 4(b).
It gradually decreases as shown in . The voltage Ve is the operational amplifier O
P, as an input voltage, where the reference voltage Vrc
It is compared with f. The operational amplifier OF, normally keeps the base voltage of the transistor Tr2 at L to turn it off, and
The terminal potential is held at H. And operational amplifier OP
, when the input voltage Ve becomes equal to Vref, the operational amplifier OF operates to turn on the transistor Tr2, and the A terminal outputs a signal *A as shown in FIG. 4(C). In the end, 15 time-varying circuits, hammer voltage V
When D is applied, a logic circuit is formed which outputs a signal times *A after a delay of the change time shown by T in FIG. 4 from the time of application. Note that this time τ is the hammer m pressure VD
varies depending on the size. Therefore, this time varying circuit 15
By measuring the hammer flight time in the following manner using

FIG. 5 shows a configuration of the present invention in which hammer flight time is measured using a time varying circuit 15.

In this figure, first, hammer 1 of the impact printing device is shown.
As in FIG. 2, a flight time par 5 is set at the hitting location. This hula/r trim bar 5 is connected to a calculation circuit 20, and this calculation circuit 20 is connected to a time change circuit 15 and a display 21. The calculation circuit 20 also includes a monostable multivibrator 28.
It is connected to the transistor TrIo of the magnet 3 via.

The time-varying circuit 15 calculates τ with respect to the change in the hammer voltage VD.
The amount of change is the same as the flight time impoverishment ISt with respect to the change in hammer voltage VD determined by experiment (positive and negative are opposite)
The time constant of O, + 几 is determined in advance so that.

The calculation circuit 20 starts counting time at the same time as applying the hammer voltage application signal *B to the time change circuit 15, and
When A becomes L, the above time counting is stopped). The calculation circuit 20 is constituted by, for example, a microprocessor, and as shown in FIG. Count the time using the procedure shown in . RIJ signal generator 2 to which hammer voltage VD is applied
3, a signal *B is generated and applied to the time varying circuit 15.

At the same time, the counting section 24 reads N-N in the number section 26.
+1 (1 is the initial value) is counted, and the determination unit 2
7, the output signal of the time varying circuit 15 at that point *
Determine whether A is L. When the determination in the determination unit 27 is NO, the number ViVS26-c N=N+1 is repeated.
A counting operation is performed. This counting operation is repeated until the signal *A becomes L, during which time the count number N gradually increases. When the signal *A becomes L, a YES signal is output from the determination unit 27 to the calculation unit 25, and the counting operation is stopped.
h. Letting the total count up to now be M, the calculation unit 25 calculates τ=MXT...
...The calculation in (1) is performed, and the signal *B is generated from the signal *
The change time τ until the occurrence of A is calculated. Furthermore, the above formula 1c
Here, T represents the time required for the counting operation corresponding to one loop of the counting section 24, that is, the unit time 2 for time measurement.

Next, the calculation circuit 20 receives the signal *A from the time variation circuit 15.
At the same time, a triggered hammer starting signal is applied to the base of the letter transistor 'I' 10 connected to the magnet 3 through the monostable multivibrator 28. This turns on the transistor TrlO. A hammer voltage VD is applied to the magnet 3 to activate the hammer 1.The calculation circuit 20 calculates that the hammer 1 has a 7 write time per 5 from the application of this hammer activation signal.
It is also measured as the time until the hammer hits, that is, the actual hammer flight time. The flight time par 5 has terminals 5a and 5b that make contact with the hammer 1. When the hammer 1 makes contact, current flows from the terminal 5a to the hammer 1 to the terminal 5b, and the calculation circuit 20 calculates whether the hammer 1 or the flight time Judge that you hit the par 5. The procedure for measuring the hammer flight time is the same as the procedure for measuring the time τ described above with reference to FIG.

In addition, the hammer voltage VD is the value (Vo volts)
, Vo±n% (2) shall be used within the permissible change range, and τn when the hammer voltage is Vo (this time is called the nominal time). ) in advance. Then, if the actual hammer flight time calculated above is T1, and the change time obtained at each measurement is τ, then τ−τn ・・・・・・・・・・・・・・・( The flight time correction time can be obtained from 3). And the practical hammer flight time is T. Then, this time T. is, To=T, +(τ−τn)・・・・・・・・・・・・(
4).

The relationship of equation (4) is shown in FIG. 7 using the coordinates of hammer voltage and time. As is clear from this figure, as long as the hammer voltage is within the range of change, the practical hammer flight time T is constant regardless of the increase or decrease in the hammer voltage.

is always 1', which is a characteristic of the hammer magnet itself placed corresponding to each digit, and is used in actual equipment under various conditions. It can be seen that I-measurement is carried out. Therefore, this practical hammer flight time T. This is used as a monitoring measurement value for adjusting the hammer flight time ft of each printing magnet constituting the hammer means.

Then, the calculation circuit 20 performs calculation according to the above equation (4), and displays the measured value on the display 21.

Furthermore, for magnets whose practical flight time does not fall within the standard value based on all of the measured values, the stroker of the hammer is adjusted for each digit to bring it to the standard value. Instead of using the value at one point as a standard, for example, measure at the center and both ends of the tolerance value, take the value Kl +, and use the average of each digit as the standard value. It is also possible to use this as a standard for replacing or selecting a magnet whose characteristics vary beyond a certain limit as a monitoring value for abnormality in the characteristics of the magnet itself.

(7) As described in detail, according to the present invention, the actual hammer flight time of the impact printing device and the hammer voltage at this measurement time are measured, and the flight corresponding to the change in the hammer voltage is measured. The amount of change in time is calculated, and the actual hammer flight time measurement value is corrected to obtain a practical hammer flight time. It has now become possible to easily obtain a correct 1ill constant value that is not affected by this variation. Therefore, when adjusting or repairing the product,
It is now possible to accurately adjust the hammer flight time and check the operating status of the impact printing device. It is possible to always keep it in good condition. Moreover, by varying the measured voltage and monitoring the variation in the value, it becomes possible to discover magnets with abnormal characteristics.

[Brief explanation of drawings]

@ Figure 1 is a schematic diagram showing the configuration of a line printer that is an example of an impact marker 111 device, Figure 2 is a schematic diagram showing a conventional method for measuring hammer flight time, and Figure 3 is a diagram showing the hammer flight time of the present invention. 4 ■ When used for orthotropy mj
FIG. 4 is a time chart showing the operating state in the circuit shown in FIG. 3, and FIG. 5 is a diagram showing the 7f! flight time of the hammer of the present invention. II determination method and configuration diagram, No. 6
FIG. 7 is a flowchart showing the operating state of the calculation circuit used in the present invention, and FIG. 7 is a diagram showing the relationship between the hammer m pressure and the hammer flight time in the method of measuring the hammer flight time of the present invention. 1...Hammer 2...Spindle 3...Magnet 4...Transistor 5 Flight time par 15...Ij & ffJl variation F
ry20...Calculation circuit 21...Display unit 2
... Stroke adjustment stopper location diagram

Claims (1)

[Scope of Claims] 1) A method for monitoring the hammer flight time of a hammer means used in an impact printing device having a hammer driving means and a hammer means, in which the timing at which the hammer strikes type is detected while the hammer The timing at which the drive means is driven is detected, the drive voltage when the hammer drive means is driven is compared with the reference voltage, the correction time is determined based on this comparison value, and the correction time is determined based on the difference between the two timings. What is the actual 7-light time of the hammer and the above correction time? A method for measuring hammer flight time, characterized in that calculation is performed by a calculation means, and the calculation result is used as a monitoring measurement value for adjusting the hammer flight time of each printing magnet constituting the hammer means. 2) The hammer flight time measuring method according to claim 1, wherein the calculation result value is obtained by adding or subtracting a fixed value to the sum or difference between the actual flight time and the corrected time. . 3) Is the reference center of the above monitoring measurement value and hammer means drive voltage? Claims 1 or 2 are characterized in that the measurement is carried out at a plurality of positions within an allowable variation range including the above, and the plurality of values obtained thereby are used as monitoring values for managing the flight time characteristics of the printing magnet. Hammer flight time measurement method described in section.