JPS6124369A - Sub scanning control system - Google Patents

Abstract

PURPOSE:To uniform the scanning line intervals by storing the timing of time intervals where scanning lines are made to equal intervals to a memory at the carrying of an original attended to the sub scanning corresponding to one unit of plural scanning lines in case of intermittent sub scanning. CONSTITUTION:Eight scanning lines are used alone unit, the time where the displacement of recording paper is between one scanning line and 8 scanning lines is measured in advance, recording timings T0-T7 of each scanning line are decided and stored in a ROM105. Suppose that a picture data is transferred to a buffer 101 from a picture data processing section and picture data for 8 scanning line's share are stored. A sub scanning control circuit 104 commands the start of continuous feeding of 8 scanning lines to a pulse motor drive circuit 106, a pulse motor 20 is turned for an amount corresponding to the feeding of 8 scanning lines, a control circuit 104 reads a data T0 from the ROM105 at the same time and starts counting the T0. When the time T0 is elapsed, the control circuit 104 commands the recording of the 1st scanning line to a buffer 101 and a recording control circuit 103. The recording up to the 8th scanning line is attained similarly and a series of recording for the 8 scanning lines is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION (Al tψField of Industrial Use) The present research relates to sub-scanning methods for reading devices and recording devices, and particularly to starting sub-scanning in units of a plurality of scanning lines.

This invention relates to a sub-scanning control method for a device that repeatedly stops.

(b) Conventional technology When reading and recording images in units of multiple scanning lines,
Processing of read data per scan line.

The time required to process recorded data depends on the complexity of the image data and varies irregularly. Therefore, intermittent sub-scanning for each scanning line requires complicated time control.

10,000, to avoid such intermittent feeding for each scan,
Although there is a method of storing one screen's worth of image data and scanning it, such a method requires an enormous amount of memory, which is disadvantageous.

Therefore, in order to eliminate such drawbacks? A method has been devised in which a number of PL lines are stored and sub-scanning is performed intermittently for a plurality of corresponding lines.

In such a system, the above-mentioned intermittent secondary feeding must be started and stopped repeatedly in order to wait for the completion of data processing.

In this case, due to the inertia of the sub-scanning system, there is a delay in startup when starting up and residual vibration when stopping. This causes disturbances in the scanning line spacing between reading and recording, resulting in deterioration of image quality, but no countermeasures have been taken in the conventional apparatus.

(e) Problems to be Solved by the Invention The present invention aims to solve the above-mentioned conventional drawbacks, and improves image quality by equalizing the scanning line spacing.

fdJ Means for Solving the Problem In the present invention, in order to achieve the above object, in the reading and recording method in which a plurality of scanning lines are treated as one unit and Kenshi 1k is performed intermittently for each unit, When a document or recording medium is conveyed during sub-scanning corresponding to a unit, the timings of the four corners of the time such that the plurality of scanning lines are equally spaced are stored in a memory, and the timings of the four corners of the time such that the plurality of scanning lines are at equal intervals are stored in a memory, and the timing of the plurality of scanning lines is read out from the memory at the timing read out from the memory. The present invention provides a sub-scanning control system characterized in that it is configured to scan scanning lines.

<8) Effect The present invention determines the timing of scanning and recording of a plurality of scanning lines based on the driving characteristics of the sub-scanning system measured in advance.
The scanning line spacing is set to be equal to eliminate scanning line irregularities.

(f) Example The present invention will be explained below using the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a recording section of a 71 comb E.

In the figure, 1 is electrostatic recording paper, 2 is a multi-stylus head, 8 is a developing device, and 4 is a pressure fixing device.

10.11.12.1: lj is a feed roller, and 20 is a step motor.

The electrostatic recording paper l is intermittently conveyed by driving the feed rollers 10.11.degree. and 12.18 by a step motor 20 via a timing belt (not shown) or the like. The multi-squill head 2 is brought into contact with the electrostatic recording paper 1, a latent image is formed for each scanning line, and toner is applied to the latent image by the developing device 3 to make the image visible. The image is fixed on the electrostatic recording paper 1 by the machine 4 and the recording is completed.

At this time, the recording timing of the scanning lines is controlled so that the interval between the scanning lines becomes equal as the timing of intermittent paper feeding and scanning.

The method of this control will be explained below.

In this embodiment, the number of scanning lines to be continuously fed all at once is set to n=8, and feeding is performed in the sub-scanning direction. FIG. 2 shows the measurement results of the driving characteristics of the static recording paper 1 when 8 scanning lines were continuously fed. The horizontal axis shows the time from the start of driving, and the vertical axis shows the displacement of the electrostatic recording paper in units of scanning section.

Figure 2. From 7, the displacement of the electrostatic recording paper is l scanning line,
The time required for 2 scanning lines, . . . 8 scanning lines is determined, and the recording timing To/%/T of each scanning line is determined.

A scan line of %1 is recorded after To from the start of driving, and a second scan line is recorded after l1ll. Similarly, Tl
I, T8... After T7, scanning lines corresponding to the pots are recorded. Note that the timing of '1G' TV may be stored in a predetermined memory.

FIG. 3 shows an example of a control circuit applied to this embodiment.

In this figure, 2.20 is the same part as shown in Figure 1, and 101.102 is the buff 1.108.
104 is a recording control circuit, 104 is a sub-scanning control circuit, and 105 is R.
OM, 106 is pulse motor drive circuit, 10″7.10
8 indicates a switch.

The operation of this circuit will be explained below.

Each of the buffers y101 and y102 has a capacity to store image data of 8 scanning lines.

Now, it is assumed that image data is transferred from an image data processing unit (not shown) to the buffer 7101, and image data for eight eclipsing lines is stored. Therefore, the switch 108 is connected to the buffer 102 side, and recording of the image data stored in the buffer 77101 is started. -In case of emergency, switch 107
is connected to the buffer 102 side, and the image data is transferred to the buffer y
102.

The sub-scanning control circuit 104 instructs the pulse motor drive circuit 106 to start continuous feeding of eight scanning lines, and the pulse motor 2
0 is rotated by an amount equivalent to a feed of 8 scan lines. At the same time, the sub-scanning control circuit 104 outputs the above-mentioned recording timing data ToN.
'r, is the first data T stored in advance from the ROM 105.

is read out and starts counting the pa recording timing To. As a result of counting, when 1"0 time has elapsed, the sub-scanning control circuit 104 outputs a rose flag 101. Recording control circuit 108
to instruct recording of the first scanning line. Also ROM 105
The next timing data l111 is read out and the recording timing T1 is counted, and after 11 hours, ? The fJ2 scanning line is recorded.

Thereafter, printing is performed in the same manner up to the eighth scanning line, and the series of printing of eight scanning lines is completed. Thereafter, it waits for the image data to be stored in the buffer 102, and when the image data is prepared in the buffer 102, the switches 107 and 108 are turned on to record eight scanning lines in the same order.

(g) Effects of the Invention According to the present invention, the scanning lines are recorded at equal intervals regardless of the disturbance in the feed in the sub-scanning direction, so that the quality of the recorded image is improved. In this example, an example using electrostatic recording paper has been described, but it is also possible to use a dielectric belt as the recording medium.
It goes without saying that the present invention is also applicable to a recording method in which an image is once formed on a recording medium and then transferred to recording paper.

Furthermore, although the time between scanning lines TO--T was used as the recording timing, other times such as the time from the start of feed may also be used. Further, in this embodiment, the case where the present invention is applied to a 7-axis recording section has been described, but it can be similarly applied to a 77-axis reading section. Furthermore, the present invention can be applied not only to facsimiles but also to graphic plotters, image input scanners, and the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment to which the present invention is applied, FIG. 2 is a diagram for explaining the present invention, and FIG. 3 is a block diagram of a control circuit for implementing the present invention. In the figure, l is electrostatic recording paper, to, ii,. 12.13 is a feed roller, 20 is a pulse motor. 101 and 102 are buffers, 103 are recording control circuits, 1
04 is a sub-scanning control circuit, 105 is a ROM, and 106 is a pulse motor drive circuit.

Claims (1)

[Claims] In a reading/recording method in which multiple scanning lines are treated as one unit and sub-scanning is performed intermittently for each unit, when a document or recording material is conveyed during sub-scanning corresponding to one unit, the scanning line 1. A sub-scanning control method, characterized in that timings at time intervals such that the times are equally spaced are stored in a memory, and the plurality of scanning lines are scanned at the timings read from the memory.