JPS6178672A - Measuring device for hammer flight time - Google Patents

Abstract

PURPOSE:To eliminate the need for detaching a hammer unit when measuring the hammer flight time and thereby avoid time-consuming operations such as fitting and detaching of a substrate, by measuring the hammer flight time on the basis of the difference between the moment a hammer collides against a platen to generate vibration and the moment a hammer-driving trigger pulse is impressed. CONSTITUTION:With an address signal ADj impressed on a terminal 68, a trigger pulse Tpj for operating a j-th hammering mechanism (j) in a hammer unit 25 is sent from an address circuit 62 to a hammer-driving unit 61, whereby the j-th hammer 5 is caused to fly out, thereby giving an impact on the platen 11 at a point pj. The acoustic shock wave generated at this moment is transmitted through the platen 11, and is detected by an acoustic sensor DTE to form an electrical signal SP (SPj). The period of time from the moment the trigger pulse Tpj is generated to the moment the electrical signal SP is detected is measured by a counter 30, and the period of time required for propagation of the sound wave is subtracted from the measured period of time by a calculating means 305, thereby obtaining the hammer flight time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flight time measuring device for a printing hammer.

[Conventional technology]

In recent years, a line printer has been widely used as an output device for electronic computers.

The main parts of this line printer, especially the printing device, are explained as shown in FIGS. 3(a) and 3(b). In other words, first of all, an endless type belt 2 running in the direction of arrow A is stretched across the two pulleys Ia and 1b shown in Fig. 3 fa). AB, U... in the upper half of the
・・１、２．８・・・・・・A11B, Honey...
The printed text 4 is engraved on it. Immediately below each printed character 4, a mark 8 indicating the position of the printed character 4 is attached in one-to-one correspondence with each printed character. The hammer 5 shown in FIG. gives a blow to the paper 12 and the ink ribbon 13 placed between the platen 11.The letters on the letter belt 2 are aligned with the hitting surface of the hammer 5, and the letters are the desired letters to be printed. If so, the character, number or symbol is printed on the paper 12J: by the impact between it and the platen 11. 31 is a sensor that detects the mark 3, and the position m1.r of the printed character to be printed. Since the distance 11iL1.]4 from !II to the home position mark 8a does not change, the current It turns out that the printed characters to be printed are the desired characters or printed characters.
In b), 20 is a driver, 21 is a magnet drive signal generator, and 23 is a 4mBm pulse input terminal. is a magnetic coil.

A line printer with such a configuration (in this case, since it is equipped with, for example, 186 impact machines Pt1t26 arranged adjacently and in parallel in the hammer unit 25 shown in FIG. 1, which will be described later), as shown in FIG. Impact mechanism 2 of the unit shown in (b)
6 is activated (in fact, it is necessary that the flight times of the corresponding hammers 5 caused by the individual functions of each striking mechanism 26 are aligned within a permissible value. The adjustment method for aligning the flight times of each hammer is shown in FIG. (b) The semi-individual set screw 27 shown in FIG.

However, even if you use this method to adjust the flight time of the b'' hammer to within the allowable value for all the impact mechanisms 26 housed in the hammer unit 25, the Depending on usage conditions, the difference in hammer flight time for each striking mechanism becomes larger.

The biggest factor is each movable part in each striking mechanism 26,
This is wear on the sliding and contact parts, and this wear causes unevenness in the flight time of the hammer, and if this exceeds the allowable limit, This results in misalignment and missing characters, resulting in an unsightly appearance.

Therefore, when the missing characters occur and become noticeable, the hammer flight time can be re-adjusted for each stroke by turning the half set screws 27 of 11I provided in each striking mechanism 26 again. It will be necessary to redo each mechanism 26 or to correct this in some other way. To do this, it is necessary to accurately measure the flight time of the hammer 5. Conventionally, in order to measure the flight time of the hammer 5, the type belt 2 was first removed from the boot IJ 1a.
Alternatively, for example m mutually insulated parallel 24
A sheet 40 in which 41 and 42 are pasted in a staggered manner is pasted on two platens 11, and each end 50.51 of the two parallel beads 41.42 is connected to a short circuit detection device (not shown). .

For example, if the hammer leaves immediately after hitting the part shown in 43, 44, 45..., parallel:
1A41, 42 cause a short period of time at the above T word 44, so a pulse is generated at the output of the j protrusion (not shown). Therefore, applying a driving pulse to the terminal 23 in FIG. 3(b) and measuring the time from time zh until the output pulse of the detection device appears is performed for each striking mechanism 26 in turn. In this case, since the time required for the electric signal to travel through the two parallel lines can be ignored, the flight time Tl' of each hammer can be measured.

[Problems that the invention attempts to solve]

However, with the above configuration, the first problem is that the ml foil forming the two parallel lines is easily peeled off by the impact of the hammer M;
The steps for removing the type belt 2 and tensioning the flexible substrate in its place are shown in Figure 2 (25 on aJ).
The hammer unit shown in the figure must be completely removed once. This second problem is particularly troublesome, as Mjt is large and a method for precise installation is required.) Removal of the stripe unit 25 requires skill, and inexperienced people are forced to do it. This may lead to damage and accidents.

[Means for solving problems]

The present invention aims to provide a printer with a new hammer flight time measurement device ↑8 that solves the above-mentioned conventional problems.
The method is to attach an acoustic sensor (impact detection means) to a predetermined location on the platen, so that a flying hammer can be detected on the platen.
The vibration that occurs when the hammer is struck is rounded out, and the flight time of the hammer can be measured from the difference between the time when this vibration occurs and the time when the hammer drive trigger pulse is applied.

[Written by Kawa]

According to the above-mentioned new printer, not only does it become unnecessary to remove the hammer unit 25 which is heavy and has a precise mounting mechanism, but also the type belt or the parallel
Complicated and time-consuming work such as pasting wires and attaching and removing the board can be avoided, which is practical and highly effective.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram illustrating the main part of a new hammer flight time measurement crack according to the present invention. Strike machine 11126 in Fig. 3(b)
For example, 186 striking mechanisms 26 are arranged adjacent to each other in the hammer unit 25 that has a built-in hammer unit 25. Counting from the left end, these are the first striking mechanism (1), the second striking mechanism (1), and the second striking mechanism (1). (2), 8th digit impact mechanism (8),...
..., and the dimensions of the hammer unit shown as O in the same figure will be called the platen length of the unit digit.

First, when operating the striking mechanism 26 of a desired digit, an address signal AL) containing the address of that digit is applied to the terminal 70. For example, the striking mechanism of the j8th digit counting from the left end (
If it is desired to fly the hammer 5 in the direction of the arrow from j), the address signal must be set to ALlj.

This address signal is applied to the terminal 68 of the address circuit 62, and from the terminal 69 at -10,000, the address signal for each digit is AJJ, A13. , AI)3. ...
Each time ... is applied to terminal 68, a start pulse of 8T is generated.
is output. However, this does not have information regarding the number of digits (or address).

When the address signal A1)J is now processed into the terminal 6K), the address circuit 62 uses an arrow force to send the trigger pulse 'l'pi for operating the first striking mechanism (j) in the hammer unit 25. The information is transmitted to the hammer drive unit 61 as shown. Then, the j-th FT ψ171 (j
) works and the j-th hammer 5 pops out, giving balance to the platen 11 at point pJ.

The acoustic shock waves generated at this time are transmitted, for example, through the platen 11 as indicated by the dotted arrows, and are transmitted to the acoustic sensor LI E
'I' is detected and becomes an electrical signal iMP (to be exact, the first digit is 8Pj). Therefore, in principle, if the bird measures the time from when the pulse 'lpj (or start pulse ST) occurs until it detects the electrical signal SP (or SP, i), the hammer flight time of the target digit can be determined. If asked, it becomes logical. However, in reality, during this time the acoustic waves propagate through the platen.
Since the rotation time td is included, this is only the apparent hammer flight time T1'"'.

The distance from each digit to the acoustic sensor 1) ET in the platen is the distance for each stroke ζ3 mechanism (11, (2), (3)
) , ...... (j + ......t All are different. Therefore, if you want to find the true value T of the hammer flight time of each digit, the acoustic sensor 1) BT Sound propagation time Td from the position to the target girder impact mechanism
(Td is 1 from the point Pi via the path YO when the hammer hits the point P1 due to the hammering mechanism of the Gth digit) The propagation time to ET is also α
).

If we rearrange this using a formula, we get the following. In other words, the apparent hammer flight time ti is T'f = 'i'f + Td...
・・・・・・・・・・・・・・・ (Represented by 11. Also, the acoustic propagation velocity in units of digits! is given by. However, Tf l' and Tf r' are respectively This is the apparent sound propagation time when the hammer hits the digit (1st digit) and the rightmost digit (136th digit).1..1. is determined by the material of the platen, so measure it in advance. Then, the measured value can be stored as a constant in the arithmetic processing means described later.Therefore, the hammer flight time TrJ of the first tool is "fj -Trt' -j x t, . . .
・・・・・・・・・・・・・・・・・・(3B)=T ``r'
(136J) X tl ・・・・・・・・・・
...It is expressed as (3b).

In FIG. 1, each of the above-mentioned equations is constructed according to the relationships shown, and this will be explained below.

The impact generated at point Pj, subsequently propagated through the platen 11, and detected by the acoustic sensor L)ET is the
After becoming p+sl' and amplified by the amplifier 301, it is applied to the counter 303 terminal. Also this counter 3
The start pulse SP sent from the terminal 69 of the address circuit 62 is applied to the terminal Q of the address circuit 62. For this purpose, the counter 303 starts counting the clock pulse CKL applied from the terminal 300 when the start pulse ST is applied, and stops counting when the electric signal Sr is applied.

Therefore, first, use the hammer on the rightmost digit to hit the rightmost digit on the platen 11, and then use the hammer on the rightmost digit to hit the rightmost digit on the platen II. The apparent hammer flight time Tfr is stored in the second memo IJMr. Then, put both of these data into the subtraction circuit 601! After performing the double calculation, the predetermined number of digits Z −136
A division operation is performed by te+jtIi calculation e line 5i1'JJ1m602. Such an operation is nothing but the calculation of the above-mentioned equation (2).

And after that - 4, whose address is j#th! If the address signal "J" containing as data is input to the multiplier 603 via the route, the multiplier 603 calculates the acoustic propagation time t1 of the unit and the data representing the jth unit using the procedure described above. #! ! gon be done. Since the data So output from the divider 602 is also added to the multiplication 'a6031, the result of multiplying these two is 8
Get 1.

From the first memory, the signal 8 corresponding to the leftmost apparent hammer flight time Tfz' that was temporarily stored earlier is received. has been output, both this output S3 and the above multiplication result S1 are input to the subtraction circuit 604. This procedure is performed by the calculation section 1! of equation (3a) above. l! There is no other way than that he was forced to do so. Therefore, if the calculation result 5aie obtained as the output of the subtraction circuit 604 is displayed as -605, for example, the true flight time of the j-th hammer given by equation (3) 1.1 time Tl −j can be found. In addition, in Fig. 1, the system of the subtraction circuit 6019, the division circuit 602, the multiplier m6oa, and the hibachi time t@604 is collectively referred to as 305, but this 305 is defined as the operation 6 logic + Be able to handle it.

In practice, this may be the case, but the temperature of the platen changes depending on the usage status of the device Ii and the td tax. At this time, as the temperature changes, td"' changes and becomes more accurate/incorrect than the 1" amount.

The next configuration that can avoid these risks is shown in Figure 2(e)(I).
This is described using J. In other words, Figure 2 (mu)
95 is a configuration diagram showing a molding example of the present invention;
The same parts as in Figure 1 are indicated with the same symbols.

In this xbtb example, two counters are used, each gtl has amplifiers 801 and 8
02 is placed. First and second acoustic sensors DI! are installed at predetermined portions of the platen, that is, at both ends of the platen. If'1 and DET2 are arranged.

Now, if the hammer of the first finger hits point Pl on the platen, IJET, , JJET.

Apparent hammer fly P + I time T that can be detected in each
f? , Tfr' are also Tfz'=Tf1+.・・・・・・・・・・・・・・・
・・・・・・・・・(4a) Tfr ”Tft+muβ+tt
It is given by XZ---(4b). However, β is the time it takes for the sound that follows the path 2 to travel between points P18@ and DET2, and α is the time that the sound that follows the path 2 travels between the points P1 and DET2.
This is the time it takes to travel between

Also, when the hammer at the 186th digit hits point P18@ on the platen, the apparent hammer flight time Tri, Tt□r/ which can be detected by L) ET l, DET, respectively.
Each of 'f' (/ = Tf + Tf tas + ta
+ is also 1 x z... (5a) Tfr''= Tf1s
m=TfI3s+'lJ ---・= ・-(5b)
is given by

In this relationship, when the trigger pulse TP1 is transmitted to the hammer drive unit 71 (as shown by the arrow), the start pulse ST is simultaneously sent out from the terminal 69 via the path. S T
is added to the respective terminals Qt and Qs of the first counter 304 and the second counter 303, and the clock pulse O shown in FIG.
Start counting KL.

-75, upper f+a) The application of the trigger pulse Tp1 causes the leftmost one (1) of the hammer fllGmt426 to work, and the hammer 5 of that (6hl(1)) hits the point P1 of the platen 11. The shock wave propagates in the direction of the dotted arrow y and dotted arrow y. As a result,
First acoustic sensor L) ETI, second speech sensor L) E
T2 outputs electrical signals 8P1 and 8P, respectively,
These signals are routed through the respective input terminal boards of the gIJ1 and second counters 304 and 303.

is input into the .

Each note from 'dot'! #Detector LIET 1, LIE'
Since the respective distances to l' 2 are different, the signal 8P
, , SP, as shown in FIG. 2(b), each 1. □, that is detected in the above fJIJ1
And the counting of clock pulses CLL in the gruel 2 counter is stopped. In other words, the 10,000 counter is m1 pieces07
The other counter counts m8 times 07 couples α. The time required for each count is Tf 1'+ T1 m, which is equal to the apparent hammer flight time Tfl', Tfr
Therefore, the following calculation is performed by the calculation φ processing means 305 using equation (411) and equation (4b).

T(i-Tfr'=tlXZ, (z=tas)
-=・(6B) If we rub 1 like this, we can use the above formula (2) (Thus, tl can be calculated, so roughly, we can use the formula (3)
a) The true hammer flight time T() can be determined, but this can also be done by the arithmetic processing means 305.

Therefore, the number of pulses counted individually by both counters 304 and 303 (therefore, the apparent hammer flight time) is temporarily stored in counters 303 and 304, and both data ds+ and S1m thus obtained are Performance means 304 surrounded by a dotted line in FIG.
Once the processing means 305 is introduced, the same procedure as described in the first embodiment is performed, and the result S1a is displayed from the processing means 305. This corresponds to 83 in FIG.

Therefore, by adding the output sea of C to the display 605, the true hammer flight time can be found here.

The advantage of the above-mentioned practical example of sword 2 is that it is only necessary to hit the platen once with a hammer, and this is different from the first example in Section M.

〔Effect of the invention〕

As explained above, according to the hammer flight time measuring device according to the present invention, there is no need to remove the type belt when measuring the hammer flight time, and there is no need to remove the type belt, which may be difficult to remove. Because there is no such thing, it can be easily measured, so a great practical effect can be expected.

[Brief explanation of drawings]

FIG. 1 is a top view showing the main structure of a printer with a pants flight time 6111 fixing device according to the present invention, @ 2 [, JCa
+ is a diagram showing a modified example, and FIG.
Figure 3 (a) shows a time chart of the waveforms of each part of
J is a perspective view showing the general structure of the printer, FIG.
Figure 3 (Co) is a diagram for explaining the impact mechanism installed in this printer, and is a diagram showing a sheet used for conventional hammer flight time measurement. In the figure numbers, Ia and 1b are pulleys, 2 is a type belt,
5 is a hammer, 11 is a platen, 12 is a paper 13 is an ink ribbon, l)gT, υETI, υET2 are acoustic sensors, and 305 is an arithmetic processing means. Figure 3 (Q) Figure 3 (C)

Claims (1)

[Claims] The hammer unit is composed of a plurality of striking mechanisms, each of which has a hammer for printing, arranged adjacent to each other, and the platen is arranged in parallel with a predetermined gap in the longitudinal direction of the hammer units. In the configuration, at least one detecting acoustic shock wave (vibration) generated when a hammer flying from the hammer unit hits a predetermined position of the platen at a predetermined position of the platen.
a means for measuring the time from the time when a start pulse is applied to the striking mechanism until the acoustic sensor detects a shock wave corresponding to the start pulse, and propagation of the shock wave in the platen. A hammer flight time measuring device characterized by comprising a signal processing means for performing arithmetic operations that avoid the influence of time.