JPH0542722A - Dot hammering control of printer - Google Patents

Abstract

PURPOSE:To make it possible to hammer dots in adjustment to the resonance point of a printing head so that data is prevented from failing to be printed in the dot hammering control system of an impact-type, piezoelectrically driven dot printer. CONSTITUTION:A dot hammering control printer consists of a printing head 1, a shuttle part 2 for moving the head, a shuttle control driver 3 which controls the movement of the shuttle part 2 and a printing head control driver 4 which drives the head 1 for hammering date. In addition, an internal dotting position generation circuit 5 is provided before the printing head control driver 4. Further the internal dot hammering position generation circuit 5 receives a printing start signal generated as an instruction at the head of printing information, and commands the printing head control driver 4 so that the dot is hammered at an equal time interval corresponding to the resonance period of a piezoelectric element during a period until the reception of a following printing start signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot control system for an impact type or dot type piezoelectric drive printer.

[0002]

2. Description of the Related Art With the recent increase in speed of printers, there is an apparatus that utilizes the resonance of a print pin using a piezoelectric element. In this device as well, the dot dot point is determined by the position signal according to the movement of the shuttle as in the past, but since the resonance development is used, the accuracy of the movement speed of the shuttle is required and the speed is constant due to disturbance. If not, the resonance phenomenon is disturbed and printing cannot be performed.

That is, as shown in FIG. 3, the print head 1 arranges dots for one line of one character in the vertical direction, for example, 24 dots, and is sent in the horizontal direction by the shuttle 2 to print characters or figures. The position of the shuttle 2 is detected by the position sensor 6, and the shuttle 2 is controlled by the shuttle control driver 3 to be sent in the lateral direction. The print head control driver 4 receives a position signal from the shuttle control driver 3 and supplies an output to the print head 1 so as to perform dot printing. The position sensor 6 is provided with a slit, and the position of the shuttle is detected by matching the slit moving with the shuttle 2 with a plurality of fixed slits.

[0004]

In the conventional hitting point control system as described above, the accuracy of the shuttle moving speed is required, and if the speed is not constant due to disturbance, the resonance phenomenon is disturbed and printing cannot be performed. There was a problem. Further, as the speed of the printer has been increased, the signal indicating the dot printing point has a high frequency and is easily affected by noise or the like.

Therefore, a main object of the present invention is to enable printing at the resonance point of the print head to prevent printing loss. Another object of the present invention is to prevent the signal indicating the dot point from being affected by noise.

[0006]

In the present invention, as shown in FIG.
As illustrated in FIG. 1, a head unit 1 for printing, a shuttle unit 2 for moving the head unit 1, a shuttle control driver 3 for controlling the movement of the shuttle unit 2, and a print head for driving the head unit 1 for dot printing. In a printing point control system of a printer provided with a control driver 4, a printing point position internal generation circuit 5 is provided in front of the print head control driver 4, and one printing point position internal generation circuit 5 is provided at the head of a predetermined print information group. A printing point control method for a printer is provided, which is characterized in that a printing head control driver 4 is instructed to perform printing points at equal time intervals until a next printing start signal is received. It

[0007]

According to the above-described method, when the print start signal output at the head of the predetermined print information group is received, the dot position internal generation circuit 5 prints at equal time intervals until the next print start signal is received. By generating a control driver signal for head hitting, the print head can be hit at fixed intervals.
If this time interval is matched with the resonance cycle of the print head, suitable print head timing control becomes possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the construction of an apparatus for carrying out a printing point control system of a printer as an embodiment of the present invention, and its waveform diagram is shown in FIG. First, when a pin corresponding to a dot (for example, 24 dots) in one vertical column of the print head 1 receives a command, the shuttle control driver 3 detects the movement position laterally by the shuttle 2 while the position sensor 6 detects the movement position. It is driven at a predetermined speed. When the print start signal is given to the head of the predetermined print information group, the shuttle control driver 3 supplies the print start signal to the dot position internal generation circuit 5, and the dot position internal generation circuit 5 has a predetermined cycle (T). The dot position signal is generated until the next print start signal is received (see FIG. 2). Printhead 1 receives the dot position signal
Drives a piezoelectric element (not shown) to print dots on the paper. Characters or graphics are printed by combining the printing with the dots. Since the print head driven by the piezoelectric element utilizes the resonance phenomenon due to its expansion and contraction, it must be driven at the timing of the resonance cycle. For this reason, it is necessary to match the period (T) with the resonance period, and the movement speed of the shuttle must be selected to correspond to the resonance period. It should be noted that the position sensor 6 is one of a plurality of slits provided in the position sensor 6 fixed to the slit interlocking with the shuttle 2.
When the two match, the position of the shuttle is determined.

In the conventional apparatus, a signal corresponding to the print start signal is commanded each time the slit coincidence signal is obtained, and the piezoelectric element of the print head is driven. When the moving speed is disturbed, the drive signal of the print head may not match the resonance timing of the piezoelectric element. The above-mentioned predetermined print information group may be set in one character unit. It is also possible to handle a character group for one line as a predetermined print information group.

[0010]

As described above, according to the present invention, it is possible to make a dot in accordance with the resonance point of the print head, and thereby to prevent the loss of printing. It is also possible to prevent the signal for hitting points from being affected by noise.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an apparatus for performing a dot-dot control system of a printer as an embodiment of the present invention.

FIG. 2 is a waveform diagram showing a print start signal and a dot position signal in the apparatus of FIG.

FIG. 3 is a diagram showing a configuration of a conventional device.

[Explanation of symbols]

 1 ... Print head 2 ... Shuttle 3 ... Shuttle control driver 4 ... Print head control driver 5 ... Dot position internal generation circuit 6 ... Position sensor

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Claims (2)

[Claims] 1. A head unit (1) for printing, a shuttle unit (2) for moving the head unit (1), a shuttle control driver (3) for controlling the movement of the shuttle unit (2),
In a dot dot control system of a printer provided with a print head control driver (4) for driving the head portion (1) for dot dot printing, a dot dot position internal generation circuit (5) is provided in front of the print head control driver (4), Internal generating circuit for the dot position (5)
Is until the print start signal output one by one at the head of the predetermined print information group and the next print start signal is received.
A printing point control method for a printer, characterized by instructing a print head control driver (4) to perform printing points at equal time intervals. 2. The dot-dot control system for a printer according to claim 1, wherein the dot-dots at the same time interval correspond to the dot-dot resonance cycle of the head portion (1).