JPH0321350B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is applicable to, for example, the dot printing pin provided on the printing hammer of JP-A-51-40221 or
No. 52-5250 relates to a dot line printer that prints using a printing wire. The following description will be made assuming that printing is performed using a dot printing pin provided on a printing hammer.

[Background of the invention]

FIG. 1 shows the arrangement relationship when the dot printing pins 2 attached to the upper end of the printing hammer 1 are arranged in a straight line parallel to the printing line, that is, at predetermined intervals along the row direction. Note that the lower end of the printing hammer 1 is attached to a hammer base 4 via a fixing screw 3.

Each of the printing hammers 1 reciprocates along the line direction in order to print a plurality of digits in a printing position of 132 digits per line. That is, the first group of printing hammers shown in FIG. 1 is housed and held in a hammer bank (not shown), and the first group of printing hammers is moved back and forth by driving the hammer bank with a reciprocating drive source such as a motor or a cam. It becomes like this. During the reciprocating process, when each printing hammer 1 passes a dot printing position, the printing hammer 1 is driven, and a dot can be printed on a printing paper (not shown).

In one direction of reciprocating movement, one horizontal column, that is, one dot row, is printed, and then when the first group of printing hammers reverses the direction of movement, the printing paper is fed to the next printing dot. Next, 1 on the return trip of the round trip.
Dot lines are printed. By repeating this operation a predetermined number of times, dot printing can be performed in the horizontal and vertical directions.

That is, dot matrix characters are printed by printing while reciprocating the first group of printing hammers along the line direction, and by feeding the printing paper to the next printing dot line position when the moving direction of the first group of printing hammers is reversed. I have to.

Although the number of dots that make up a character varies, a structure with 5 dots in the horizontal direction and 7 dots in the vertical direction will be described. The second example of printing with this character structure is
As shown in the figure. The number of dots in the horizontal direction has a one-dot gap to accommodate the space between characters printed in each digit. Therefore, the number of dots in one digit in the horizontal direction is six. For this reason, when each printing hammer 1 is arranged so as to print n digits, each printing hammer 1 needs the ability to print 6×n dots in one direction during reciprocating movement.

In order to print one line of characters, each character is made up of seven dots in the vertical direction, so it is necessary to make one round trip seven times, or 3.5 times. Furthermore, it is necessary to feed the printing paper to the first printing position of the next line, and if this operation is performed within one time of one-way reciprocating movement of the first group of printing hammers, printing of one line and feeding of the printing paper to the next line can be completed. requires eight one-way trips or four round trips.

In order to realize a dot printing device with a printing speed of N (lines/min), the one-way operation time, that is, the time t (ms) allowed to feed the paper from printing one dot line to the position of the next printing dot line. is, t=(60000/N)×1/8=7500/N(ms)...(1).

The time required to reverse the first group of printing hammers and feed the printing paper to the next printing dot line position is t _pf (m
s), the (minimum) time from when the printing hammer 1 is driven once until it is driven again is t _p (ms, hereinafter t _p
is called hammer repeat time), the number of dots in one digit in the horizontal direction is 6, and each printing hammer 1
Since n digits are printed, the time t becomes t=t _pf +6×n×t _p (ms) (2). Therefore, the hammer repeat time t _p is
Equation (2) is transformed and expressed as the following equation.

t _p = (t - t _pf ) / (6 x n) (ms) ... (3) From equation (3), when the printing speed is the same and the number of printing hammers 1 is the same, if t _pf is large, t _p It can be seen that when t _pf becomes smaller, t _p becomes larger.

If the number of printing hammers 1 is set to 66 in order to achieve a printing speed of 600 lines/minute, one printing hammer 1 will print 2 digits since one line has 132 digits. Therefore, equation (3) is n=2, t=7500/6
Since 00=12.5, t _p =(12.5−t _pf )/12(ms) ……(4). This relationship is shown in FIG. 3 by a solid line.

It can be seen that when t _pf is 7 ms, a printing speed of 600 lines/min can be achieved if t _p is 0.458 ms or less.

If t _pf can be shortened, t _p will become longer and printing hammer 1
It is clear that the performance of But t _pf
Naturally, there are limits, and the same goes for _tp . t _pf and
Assuming that the limits of t _p are 7 ms and 0.5 ms, respectively, it is impossible to achieve a printing speed of 600 lines/min using the method described so far.

In other words, to achieve a printing speed of 600 lines/minute,
66 printing hammers 1 are insufficient and more printing hammers 1 are required. For example, printing hammer 1 is 132
In the case of _tp =(12.5− _tpf )/6(ms)...(5). When t _pf is 7 ms, t p is 0.916 ms, and if the performance limit of t _p is 0.5 ms, a printing speed of 600 lines/min can be easily achieved.

However, in this method, the number of printing hammers 1 increases, and it is necessary to increase the size of the reciprocating drive source for reciprocating the printing hammers 1 and the printing hammer driving means (not shown), which increases the cost. do not have.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to enable high printing speed to be realized at low cost without increasing the number of dot printing hammers.

[Summary of the invention]

The present invention provides two reciprocal movements of the printing hammer group in one direction.
Focusing on the fact that if the dot rows could be printed simultaneously, the number of reciprocating movements of the printing hammer group required to print one row could be reduced by almost half, and a high printing speed could be achieved, the dot printing pins were connected to the adjacent dot printing pins. The dot printing pins are arranged in two rows in the digit direction that are vertically shifted from each other, and the reciprocating stroke of the printing hammer group is set to be approximately equal to the pitch of the dot printing pins in the same row. The dot printing pins in a column can print the same character in the same row with the adjacent dot printing pins in other columns, and the vertical spacing between the two columns of dot printing pins is an integral multiple of the vertical dot spacing. , and half the number of dot lines to be printed in one line (round up the fraction)
The interval is set so that the printing of one line of characters is completed with the number of one-way movements of the printing hammer group equal to the number of times, and a high printing speed is obtained with a low-performance printing hammer with a long hammer repeat time t _p . This is what I did.

[Embodiments of the invention]

An embodiment of the present invention will be described using a printing speed of 600 lines/minute as an example.

The printing hammer 1 is arranged as follows.

The dot printing pin 2 of the adjacent printing hammer 1 is
The dots are placed at positions that are an integral multiple of the dot spacing in the vertical direction, that is, in the paper feed direction. This will be explained in more detail using FIG. 4.

When the dot printing pin 2 of the No. 1 printing hammer 1 is in the vertical position 1 in Fig. 2, the No. 2 printing hammer 1
The dot printing pin 2 is placed at the vertical position 5 in FIG. In other words, each dot printing pin 2
The vertical spacing is (vertical dot spacing)×4. The dot printing pin 2 of the No. 3 printing hammer 1 is at the same vertical position 1 as No. 1, and the dot printing pin 2 of the No. 4 printing hammer 1 is at the same vertical position 5 as No. 2. That is, odd numbered printing hammer 1
All the dot printing pins 2 of the even numbered printing hammers 1 are arranged at the vertical position 5. As a result, the dot printing pins 2 located at the vertical position 1 and the dot printing pins 2 located at the vertical position 5 are arranged in rows in the horizontal direction, with an interval of four dots.

The horizontal spacing between each dot printing pin 2 is 66 (actually
67 pieces), so it corresponds to 2 digits, and 1 digit is 2.54 mm.
Therefore, it is 5.08mm.

The reciprocating distance of each printing hammer 1 is set within the range shown in Fig. 4, that is, within the range approximately equal to the pitch of the dot printing pins 2 in each row, so the first digit character is No. 1. and No. 2 printing pin 2, the second digit character is printed with No. 1 and No. 2 printing pin 2, and the third digit character is printed with No. 3 and No. 2 printing pin 2. , the last 132nd character is No.67 and No.
It will be printed with 66 printing pins 2.

With this arrangement of the printing hammer 1, in order to form a character of 5 dots in the horizontal direction and 7 dots in the vertical direction,
It is sufficient to move one group of printing hammers four times, which is half of the rounded-up number of seven dot lines, that is, to make two round trips. That is, odd numbered printing hammer 1 is at vertical position 1
The even-numbered printing hammers 1 are in charge of vertical positions 5 to 7, and one line of characters is printed.

After that, the first printing position of the next line, that is, the odd numbered printing hammer 1 is in the vertical position 1, and the even numbered printing hammer 1 is in the vertical position.
Feed the printing paper so that it is located at vertical position 5.
If this operation is performed within one time of one-way reciprocating movement of the first group of printing hammers, it is possible to print one line of characters and feed the printing paper to the next line by 2.5 hours of the first group of printing hammers.
Requires round-trip transportation.

Therefore, the operating time t(m
s) is as follows: t=(60000/600)×1/5=20(ms)...(6)

The number of horizontal dots that each printing hammer 1 is responsible for is 6× since each printing hammer prints 4 digits.
4=24, and the hammer repeat time t _p is
Since the one-way operation time is 20 ms, t _p = (20 - t _pf )/24 (ms) (7). This relationship is shown in FIG. 3 by a broken line.

From equation (7), if t _pf is 7 ms, t _p is 0.541 ms
If the printing speed is below 600 lines/minute, it is possible to achieve a printing speed of 600 lines/minute.
In the conventional method of printing one dot line at a time, t _p
While it is possible to achieve a printing speed of 600 lines/minute in less than 0.458ms, the present invention achieves a printing speed of 0.083ms or less.
83μS slow hammer repeat time t _p is sufficient, t _p is 0.5
This means that printing speed of 600 lines/minute can be achieved with 1 ms printing hammer.

〔Effect of the invention〕

As described above, according to the present invention, two dot lines are printed at the same time when the dot printing hammer group is moved, so the number of reciprocating movements of the dot printing hammer group required for printing the first position can be halved, and the dot printing hammer group can be moved back and forth by half. High printing speed can be achieved without increasing the number of printers. Further, there is no need to increase the size of the drive source for reciprocating the group of dot printing hammers, and the dot line printer can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the arrangement of a conventional printing hammer group, FIG. 2 is a front view showing characters printed by a dot line printer, and FIG. 3 is a characteristic diagram showing the relationship between paper feed time and hammer repeat time. FIG. 4 is a front view showing an example of the arrangement of printing hammer groups according to an embodiment of the present invention. In the figure, 1 is a printing hammer, 2 is a dot printing pin, 3 is a fixing screw, and 4 is a hammer base.

Claims (1)

[Scope of Claims] 1. A plurality of printing hammers having dot printing pins are arranged along the digit direction so that the dot printing pins are equally spaced in the digit direction, and these printing hammer groups are reciprocated along the digit direction. and in the process of this reciprocating movement, the printing hammer is driven to print with the dot printing pin, and when the moving direction of the printing hammer group is reversed, the printing paper is sent to the next printing position. The dot printing pins are configured such that adjacent dot printing pins are vertically shifted from each other and positioned in two rows in the digit direction, and the reciprocating stroke of the printing hammer group is set to the dot printing pins in the same row. The dot printing pins in one column can print the same character on the same line with the adjacent dot printing pins in the other column by setting the pitch to be approximately equal to the pitch of the dot printing pins in the two columns. The vertical spacing is an integral multiple of the vertical dot spacing, and 1
The interval is set so that the printing of one line of characters is completed with the number of one-way movements of the printing hammer group equal to half the number of dot lines to be printed in a line (fraction is rounded up), and when the printing hammer group moves, A dot line printer characterized in that the two rows of dot printing pins print two dot rows at a time.