JPS59196277A - Variable sub-scanning system of printer - Google Patents

Abstract

PURPOSE:To make it possible to obtain an output image without irregularity by smoothing the variable driving of a paper feed pulse motor, by monitoring the change of an input data accumulated amount to the point of time when the frequency of a feed pulse prior to plural times is determined. CONSTITUTION:Outputs of counters COU2-1-COU2-n and COU1 are compared by a comparator circuit CMP2 while the min. value thereof is compared with a value obtained by converting the cycle of the previous feed pulse latched by a converter circuit RES by CMP1 and the magnitude thereof is judged to input both values to an up down counter COU3. In this case, the converter circuit RES latches the output of the counter COU3 as the cycle information of the feed pulse and allowed to correspond to an input data accumulated amount. In the next step, memory ROM outputs the cycle information of the feed FED to a counter 4 corresponding to the increase and decrease of the output signal of the counter COU3 and loads the same in matching relation to the previous FED output and a FED pulse is made as the counting result thereof. By this method, the variable driving of a paper feed pulse motor can be smoothed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer device, and particularly relates to its machihen sub-scanning force type.

This type of variable sub-scanning printer, as shown in FIG.
In order to make the feed pulse FED to the pulse smoke of paper feeding variable, when determining the period of the feed pulse FJdD, a counter C0 indicating the amount of accumulated input data at that time is used.
A counter C0 that indicates the value of IJI and the amount of accumulated input data at the time when the cycle of Luz FED is determined 611 times.
The value of U2 is compared with the comparator 1/-ri C1\4P, and the up/down counter C0U3C is output, and the accumulated amount of input data is JIQ reduced. The output of the ll counter C0U3 is incremented and decremented.

Then, the counting result of counter C0U3 is stored in memory), [)
The period of the feed pulse is determined by converting it by M, and the period of the feed pulse is determined by loading the counter C0U4c, and the feed pulse FF3D is outputted from the division result.

However, in this conventional method, the feed pulse F
In order to output ED, the amount of accumulated input data for those 115 points is compared with the accumulated amount of input data at the time when the previous feed pulse (FJ) was output.
'), so for example, if the product due to manual measurement is to increase and decrease alternately each time feed pulses F and IffD appear, the cycle of feed pulse FED is also determined. Accordingly, there is a drawback that the amount increases and decreases, causing unevenness in the output image of the printer.

The present invention has been made in view of the above-mentioned conventional circumstances, and
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned drawbacks and to obtain an even output image by monitoring changes in the amount of input data stored in a printer device several times up to the point in time when the cycle of feed pulses II is determined. It is possible to provide the sub-scanning force formula according to the gr standard.

In order to achieve the above object, the present invention uses a variable sub-scanning method of a printer device to determine the period of the feed pulse to the paper feed pulse motor. Instead of using the input data accumulation amount at the time as an index, the input data accumulation amount at the time when the feed pulse cycle was determined and the minimum value of the input data accumulation amount at the present time and the previous feed pulse are calculated multiple times. A method is adopted that uses the results of comparison with the value indicating the period.
The feature is that the period of the shifted pulse is determined based on the magnitude of the comparison result, and the speed of the pulse motor is reduced.

A preferred embodiment of the misfire 1j will be specifically explained below with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, an embodiment of the present invention is shown.

Input data at that time M jA Counter CO does not indicate the amount
Ut, input data M' at the time when the cycle of the nth previous feed pulse FIUI) was determined? tfr? counter C0U2-n, callan 9C (JU2-1-COU
2-n, power') Link C0UI (7,) Circuit CMP2 that outputs the minimum of the outputs, register RP】S
Comparator CMP that compares the values of and circuit CM, P2
L Up/down counter C0U3, counter C0U
A conversion circuit RES that includes a read-only memory ROM that determines the frequency of the feed pulse IJDD by the output of 3, a counter C0U4 that outputs the feed pulse, and a register.
, counter CO[ANJ which applies the gate to the output of J4
(Constructed including children.

Next, to explain the operation, the unfired f1. As shown in Fig. 2, the outputs of counters C0U2-1 to C0U2-C (JU2-n and counter C0UI
and outputs the minimum value to comparator CMPL. And the comparator CMP l is connected to the circuit C8 (P2
The output of circuit C is compared with the value obtained by converting the period of 811 feed pulses latched by conversion circuit 1 (・ES),
When the value of MP2 is large, it is determined whether the value of the conversion circuit RES is large or the same, and the information is output to the up-run counter COU3. Counter C0U
3? -j, G. Accordingly, when the feed pulse Ii"ED that determined the same period last time is output, it becomes up, down, or unchanged 2. Also, the conversion circuit R]"]S is the counter C0U3. Feed the output of pulse period 1#
There is a material that latches the information and makes it correspond to the input data storage amount. After that, as in the conventional method, the counter COU
Memory YOM l-J succumbs to the increase and decrease of output number a of 3.
The 1a report of the period of the feed pulse FED is sent to the counter C0U.
The counter C0U4 outputs the previous feed pulse FJ? , ]) is loaded in accordance with the output, and the foot-pulse operator II and ED are created from the counting results. In this case, the value converted by the conversion circuit RES has a one-to-one correspondence with the period of the feed pulse.

Also, as a modification of misfire 191, conversion circuit '1 (・J!;
The human power of S is stored in memory (from the output of M4 and 9, the conversion circuit R
There is also a method of performing an inverse transformation of +nl *l vs. II in ES and outputting it to the comparator CMPl.

As described above, input data melt Jf (amount
Since it is viewed from E, it is possible to suppress fluctuations in the fine input data accumulated within G, and as a result, the operation of the paper feed pulse motor is smoothed, and unevenness in the output image of the printer can be suppressed. .

As explained above, when the input data storage board of the printer is viewed at multiple times, the present invention smoothes the shift of the paper feed pulse motor 11jl and provides an output image free of 71 etc. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a Yoku-Sei 27 force type that was proposed before the present invention. C0UI...Counter that does not indicate the amount of accumulated input data, C0
U2, . . . +it input data storage at the time when the cycle of the single feed pulse FED is determined, a counter indicating R1t-l, C0U3, . . . Up/down counter 'I
C0UJ・Fist-Feed pulse FB, D output counter, CMP.・-Comparator, l(,0,lX4-・φ″ Counter C0U3 output G determines the cycle of feed pulse I″El). -Only memory, i''BD, output pulse motor, CLK, -clock FIG. 2 is a block diagram showing an embodiment of the sub-scanning force type according to the present invention.

Claims (1)

[Claims] In the variable sub-scanning method, which increases or decreases the speed of the paper feed pulse motor according to the increase or decrease in the amount of accumulated input data, in order to determine the cycle of the feed pulse that controls the drive of the pulse motor, the cycle of the feed pulse up to several times before is determined. The minimum value is selected from the input data storage amount and the current input data storage amount, and the selected minimum value is compared with a value indicating the cycle of n1] feed pulses. This is a sub-scanning force type printer that determines the length of the image and increases or decreases the speed of the pulse motor.