JPH02303860A - Wire-dot printer printing method - Google Patents

Abstract

PURPOSE:To lighten noise to be generated from a head in a form difficult to receive an influence due to a printing pattern by a method wherein effect to be obtained by delaying drive timing by integral times continuous printing cycle and effect to be obtained by delaying the drive timing further therefrom within the continuous printing cycle are generated. CONSTITUTION:Drive timing of a kth wire of a head composed of (n) wires is delayed by (1+1/(n+1))kT0 times continuous printing cycle T0 to drive timing of a first wire. When scan speed of a head 5 is taken as (v), the kth wire 5k is arranged by shifting by (1+1/(n+1))kvT0 to the first wire 51. The number of wires to be driven per unit times is averaged, and dispersion becomes extremely small. Therefore, noise amount to be generated per unit time is equalized, and low frequency noise like that having a letter pitch as cycle is extremely lightened. Since the drive time comes to be further divided into timing per each wire within unit time, frequency of generating noise is raised by comparing with a case of delaying by integral times continuous printing cycle T0.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a printing method for a wire dot printer.

[Prior Art 1] The printing method of a conventional wire dot printer is to drive wires arranged perpendicularly to the scanning direction of the head at the same drive timing while scanning the head. For example, when printing the character string shown in FIG. 9 using a head consisting of eight wires, printing is performed while driving the number of wires shown in FIG. 10 per unit time.

1. Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, the number of wires driven at one time varies greatly depending on each drive timing, which tends to generate relatively low-frequency noise, and it is difficult to drive a large number of wires at one time. When driven continuously, large high-frequency noises were generated.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a printing method that reduces the noise generated by the head in a manner that is less susceptible to the effects of the print pattern.

[0 Means for Solving the Problems 1] The printing method of the present invention is such that the drive timing of at least one wire is equal to or greater than the continuous printing period with respect to the drive timing of another specific wire, and is an integer of the continuous printing period. It is characterized by delaying the amount of time so that it does not double.

1 Effect 1 According to the above method of the present invention, the effect of delaying the drive timing by an integral multiple of the continuous printing cycle and the effect of further delaying it within the continuous printing cycle reduce the noise generated by the head due to the print pattern. It can be reduced in a way that makes it less susceptible.

Embodiment j FIG. 1 is a block diagram showing a configuration for realizing an embodiment of the present invention. Print data 1 for each wire is input to a shift register 2 for each wire. clock 3
The print data 1 in the shift register 2 is shifted by the pulse generated by the shift register 2, and when it is output from the shift register 2, each wire drive circuit 4 is operated to perform printing. Here, by changing the number of clocks from input to output of shift register 2 for print data 1 of each wire, the drive timing of at least one wire can be delayed with respect to the drive timing of another specific wire. .

FIG. 2 is a timing diagram showing an embodiment of the present invention,
The drive timing of the 2nd wire of a head consisting of n wires is set to (1+1/ (n+1))kTo of the continuous printing period TO with respect to the 1st wire drive timing.
It is characterized by being delayed by twice as much. FIG. 3 is a plan view showing a head realizing an embodiment of the present invention, in which the head 5
When the scanning speed of is V, the kth wire 5k is connected to the first wire 51 by 1+1/(n+1))kvT
They are arranged offset by o.

First, the drive timing is set to kTo, an integer multiple of the continuous printing period To.
I will explain the effect of delaying the time. Head 5 in Figure 3
If the character string shown in FIG. 9 is printed using , the number of wires driven per unit time will be averaged as shown in FIG. 4, and the variation will be much smaller than in FIG. Therefore, the amount of noise generated per unit time is equalized, and low-frequency noise whose period is equal to the character pitch can be significantly reduced. The sponge-like sound-absorbing materials commonly used in sound-absorbing materials have excellent sound-absorbing properties in the high-frequency range, but hardly absorb noise in the low-frequency range, so suppressing the generation of low-frequency noise is a great way to reduce noise. bring about an effect.

Next, the drive timing is set to kTo/( within the continuous printing period TO)
The effect of delaying by n+1) will be explained. When printing a character string as shown in Figure 9, the wire drive is further divided into timings for each wire within the unit time shown in Figure 4, so it is delayed by an integral multiple of the continuous printing period To. The frequency of the generated noise can be further increased compared to the case where the noise is generated. Furthermore, considering the case of solid printing, in the conventional printing method, as shown in FIG. 5, noise equivalent to the number of wires is generated for each continuous printing cycle. However, if the drive timing of each wire is delayed by equal parts within the continuous printing cycle, the generated noise will be as shown in Figure 6, the fundamental frequency will be multiplied by the number of wires, and the noise level will be - by the number of wires. become. In other words, most of the noise is increased to outside the audible range, and the noise within the audible range can also be made to have a high frequency and a small amplitude. Therefore, combined with the effect of the sound absorbing material, a large noise reduction effect can be obtained.

In the embodiment shown in Fig. 2, the timing is delayed sequentially starting from wire 1, but the correspondence between the wires and the drive timing is not particularly limited, and when printing a specified pattern, there may be variations in the number of wires driven per unit time. Each drive timing may be assigned to each wire so as to be minimized. Furthermore, the method of delay within the continuous printing cycle is not limited.

FIG. 7 is a timing diagram showing another embodiment of the present invention, which is characterized in that a plurality of wires are driven at one drive timing.

In the present invention, an embodiment has been described based on the block diagram of FIG. 1, but as shown in FIG. 8, after each data 1 is held in each latch 6, each data is It may be realized by a configuration such as activating the wire drive circuit 4. Further, a similar effect can be obtained for a type of printer in which the head does not scan.

[Effect of the invention 1] As described above, according to the present invention, the noise generated by the head can be reduced by the effect of delaying the drive timing by an integral multiple of the continuous printing period and the effect of further delaying the drive timing within the continuous printing period. It has the effect of reducing the effect in a way that is less susceptible to the effects of the pattern.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a configuration for realizing an embodiment of the present invention. FIG. 2 is a timing diagram showing an embodiment of the present invention. FIG. 3 is a plan view showing a head realizing an embodiment of the present invention. FIG. 4 is a timing diagram showing the effects of the embodiment of the present invention. FIG. 5 is a timing diagram showing a conventional printing method. FIG. 6 is a timing diagram showing the effects of the embodiment of the present invention. FIG. 7 is a timing chart showing another embodiment of the present invention. FIG. 8 is a block diagram showing another configuration for realizing the embodiment of the present invention. FIG. 9 is a printed character string explaining the invention in detail. FIG. 10 is a timing diagram showing a conventional printing method. 111. Print data 21. , shift register 360. Clock 410. Wire drive circuit 591. Head 630. Latch 790. Applicant for timer and above Seiko Epson Co., Ltd. Representative Patent Attorney Kizobe Suzuki (and 1 other person) 7. Tap 1 data 5゛ To, ni' 0゛1ゝ“1° Figure 3 Figure 4! t Tsuka Wire failure 18 [Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In a printing method for a wire dot printer having a head made up of a plurality of wires, the drive timing of at least one wire is set to be equal to or longer than a continuous print cycle and an integral multiple of the continuous print cycle with respect to the drive timing of another specific wire. A printing method of a wire dot printer characterized by delaying the printing by a length of time that prevents the printing from occurring.