JPH07102721B2 - Print timing generation circuit - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial printer, and more particularly to a circuit for generating print timing.

[Conventional technology]

Conventionally, this type of serial printer manages the position of the carrier by the rotation angle of the spacing motor, and the print timing is created at a fixed time interval after the carrier reaches a constant speed. Even in the case of a serial printer equipped with a linear position detector, the print timing is generated by the resolution of the linear position detector.

[Problems to be Solved by the Invention]

The above-mentioned conventional print timing generation circuit has a drawback that an error occurs in the print position when the carrier changes in speed because the print timing is generated in a fixed time.

Even when equipped with a linear position detector, there are multiple print modes, so depending on the print mode, 1/160 ″, 1/180 ″, 1 /
It is necessary to generate the print timing by moving the carrier in 240 ″ units. Therefore, the resolution of the linear position detector is
At least 1/1440 ″ units were required, making such short-interval pulses very difficult to make.

[Means for Solving the Problems]

According to the present invention, a linear position detector for generating two-phase carrier position detecting pulse signals having 90 ° phases different from each other in synchronization with the movement amount of a carrier carrying a print head, and a two-phase linear position detector. A multiplication circuit that multiplies the pulse frequency of the carrier position detection pulse, a circuit that controls the carrier position by a two-phase carrier position detection pulse signal, and a signal that is generated at the position to print, and a circuit that generates at the position to print And a counter circuit for starting the counting of the multiplied pulse signal from the multiplying circuit and generating the printing timing.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention, and FIG. 2 shows its time chart. Linear position detector 1 has 2
Phase position signals A and B are output, and the resolution is 1/18
The position signal multiplication circuit 3 multiplies the position signals A and B by 8 and outputs the position multiplication signal C. The carrier position control circuit 2 manages the carrier position by the position signals A and B, and When the position reaches the position to be printed, the gate signal D is output and the counter 4 is activated.
Outputs the print timing signal E by counting the number of position multiplication signals C. In the case of FIG. 2, the print timing signal E is output for every 9 pulses of the position multiplication signal C in order to output the 1/160 ″ print timing. Similarly, in the case of 1/180 ″, 8 pulses, 1/240 , The print timing signal E is output every 6 pulses.

〔The invention's effect〕

As described above, by adding the position signal multiplying circuit, the present invention can be used even in a linear position detector having a relatively low resolution, and as a result, the printing quality can be improved. Further, by selecting the tracking constant of the position signal multiplying circuit, the accuracy error of the linear position detector can be absorbed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a time chart showing the operation of the embodiment of the present invention. 1 ... Linear position detector, 2 ... Carrier position control circuit, 3 ... Position signal multiplication circuit, 4 ... Counter, A ...
Linear position detection signal A phase, B ... Linear position detection signal B
Phase, C ... Position multiplication signal, D ... Gate signal, E ... Print timing signal.

Claims (1)

[Claims] 1. A linear position detector for generating carrier phase detection pulse signals of two phases different in phase by 90 ° in synchronism with a movement amount of a carrier carrying a print head, and the two phases from the linear position detector. A multiplying circuit for multiplying the pulse frequency of the carrier position detecting pulse, a circuit for controlling the carrier position by the two-phase carrier position detecting pulse signals, and further generating a signal at a position to be printed; A print timing generation circuit having a counter circuit for starting counting of the multiplied pulse signal from the multiplication circuit by a signal generated at a position and generating a print timing.