JPS5927672A - Printer synchronism system - Google Patents

Abstract

PURPOSE:To prevent an image distortion, by detecting a rotating speed of a paper feed system motor for controlling a clock pulse and making the aspect ratio of an image constant. CONSTITUTION:The speed of a printer paper 1 moved as shown in solid lines is detected for the number of revolutions of the paper feed motor 2' with a tachometer 8. The clock of a clock generator 4 is controlled in response to the change in capacity C of a varactor diode 10 by controlling the voltage varactor diode 10 with a detected voltage via a buffer 9. This clock is frequency-divided into a prescribed clock with a frequency divider 5 and an image signal of an image memory 6 is read out with the frequency-divided clock. Further, the read- out image signal is inputted to a write head 7 and the write head 7 prints out the image signal on the printer paper 1 in synchronizing with the clock.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a printer device using a line scan method.
0 Regarding Link Synchronization System (b) @"Last Technology and Problems In general, in a line scan type 7' link device, the paper feed direction is vertical, and the writing direction of the write head is horizontal. In this case, It is assumed that the speeds in the vertical direction and the speed in the horizontal direction are synchronized.For this reason, a high-performance stepping motor or the like with less uneven rotation is used as the paper feed motor.

Figure 1 is a schematic diagram of a printer device having a conventional paper feed shimoter. In the figure, printer paper 1 is fed through a rotating shaft 3 of a stepping motor 2 in the direction of the arrow.

The clock pulse generated by the clock pulse generator 4 (
(hereinafter referred to as clock) is divided into a predetermined clock by the divider 5, and the image information is transmitted using the divided clock. II
P\A is read out from the image memory 6, and the read information is input to the recording head 7 to draw a predetermined image on printer paper l. In this case, the rotation speed of the motor 2 changes due to the load IK movement of the printer device, and this change changes the ratio of the horizontal and vertical lengths of the image, causing distortion to the image drawn on the printer &1. It is expressed in

For this reason, the motor 2iJ printer &
There is a demand for high-performance printers that do not cause rotational defects, but this has the disadvantage of increasing the price of printer devices. It is an object of the present invention to provide a new printer synchronization method that detects the speed and controls the clock frequency of a clock generator using the detection signal to maintain a fixed aspect ratio of an image (d) Structure of the invention In order to achieve this object, the present invention provides that writing of an image in the horizontal direction of a printer device having a paper feed system motor that drives the image in the vertical direction is performed using a clock pulse as a reference pressure, and that the paper feed system motor drives the image in the vertical direction. It is characterized in that by detecting the rotational speed of the motor and controlling the clock pulses, the vertical-to-horizontal ratio of the image becomes constant.

(e) Examples of the invention The present invention will be explained below based on the embodiment shown in FIG. In FIG. 2, the paper feeding direction of one printer is assumed to be 1.

In this case, in order to synchronize the speeds in the vertical and horizontal directions, the moving speed of the printer paper moving in the vertical direction is detected by the rotational speed of the motor, and the speed in the horizontal direction is controlled using the detection signal.

In the figure, the speed of the printer paper 1, which is 5i4IJ, as shown by the solid line, is determined by detecting the number of rotations of the paper feed motor 2' using a tachometer 8. The detected voltage controls the voltage j5J variable capacitance diode 10 through the buffer 9, and controls the clock of the clock generator 4 in response to the change in the capacitance 1C of the variable capacitance diode. The clock is divided into the required clocks by a frequency divider 5, and the image signal from the image memory 6 is read out using the divided clock. The read il++9 is inputted to the door by the attendant, and the RAD 7 synchronizes with the clock and prints 7 lint images on the paper l.

(f) Effects of the Invention According to the present invention, by feeding back the rotational speed of the motor to the clock generator, the l1i without image stoppage can be achieved.
0 has the advantage of being able to print 11 images.

[Brief explanation of drawings]

FIG. 1 shows a conventional printer apparatus, and FIG. 2 shows an embodiment of the present invention. In the figure, Ifi paper, 2 and 2' are motors, 3 is the motor shaft, 4 is a clock generator, 5 is a frequency divider, 6 is an image, 7 is a writing head, 8 is a tachometer, 9 is a buffer, 10 〇P1 diagram shows a voltage variable capacitance diode

Claims (1)

[Claims] In a printer having a paper feed motor that drives the image in the vertical direction, one image is captured in the horizontal direction based on a clock pulse, and the rotational speed of the paper feed motor is detected. A printer synchronization method characterized in that the vertical-to-horizontal ratio of the picture book is kept constant by controlling a nuclear clock pulse.