KR19980018972A - Serial Head Type Recording Apparatus - Google Patents

Abstract

Provided is a serial head type recording apparatus capable of minimizing occurrence of interline pitch unevenness.

The pulse number correction value holding section 32 holds the pulse number correction value corresponding to the conveying irregularity appearing during one round of the conveying roller and the control section 33 sets the target number of pulses ), And the target number of pulses (real number) of the personnel position at the line-to-line destination is integerized, and the number of pulses obtained by this integerization is provided to the pulse motor 11 to control the amount of rotation. In addition, the control unit 33 corrects the target number of pulses at the current HR position corresponding to the fact that the number of integer pulses is supplied to the motor, not the real number.

Description

Serial head type recording device

The present invention relates to a serial head type recording apparatus for carrying recording paper in correspondence with the width of a serial head in a printer using a serial head.

1 is a perspective view showing a main part of a general serial head type recording apparatus. This serial head type recording apparatus comprises a conveying roller 1 for conveying a recording sheet (not shown), a platen 2 arranged in the vicinity of the conveying roller 1, a motor A group of gears 3 for transmitting the rotational force of the motor to the conveying roller 1, a serial head 4 for greeting the recording sheet, a head supporting body 5 for supporting the serial head 4, An ink ribbon cassette 6 set on the head supporting body 5, a shaft 7 for guiding the head supporting body 5 in the lateral direction of the recording paper, and a paper feeding tray 8.

Fig. 2 is an explanatory view showing a human body mechanism. Fig. A recording sheet 10 is positioned between the serial head 4 and the platen 2. [ An ink ribbon 6a of the ink ribbon cassette 6 is interposed between the recording sheet 10 and the serial head 4. [ The serial head 4 and the ink ribbon cassette 6 are moved in the leftward direction (carriage scanning direction) in Fig. 2 and the ink ribbon 6a is wound on the side roll 6c unwound from the paper feeding side roll 6b . When the party is greeted, the conveying roller 1 is driven to move the recording sheet 10 by a new line width.

Fig. 25 is a schematic diagram showing a state in which greetings of up to about 1/3 of the third row and the next row are formed on the recording sheet 10 by the aforementioned greeting principle.

In such a recording apparatus using the serial head 4, there is a problem of incidence of leading pitch inconsistency. This inter-row pitch unevenness is caused by conveyance unevenness in the recording paper transport system. This conveyance unevenness is caused by the eccentricity and phase of the conveying roller 1 and the gear. As shown in Fig. 26, if the conveyance amount of the recording sheet 10 is larger than the required line width (the width of the serial head 4), a gap is generated between the lines. If the conveyance amount is small, the image is undesirably superimposed, An image is deteriorated due to an occurrence of an anomaly or a dot mismatch. Fig. 26 is a schematic diagram showing an ink layer in the sublimation type printer not shown.

Fig. 27 is an explanatory view showing the relationship between the conveyance unevenness and the line-to-line fluctuation. Here, S is the target conveyance amount, and L is the actual conveyance amount. Then, the difference between S and L becomes the transport unevenness F (F = L-S). Since the gap between the 0th line and the 1st line is L1- (L0 + G) and L0 = S0 + F0, L1 = S1 + F1 and G = S1-S0, -F0.

28 is a graph showing the relationship between the number of pulses to be supplied to the motor and the paper feed amount, in which the solid line shows the ideal feed amount (without conveyance unevenness) and the dotted line shows the actual feed amount (with uneven conveyance).

In order to solve this kind of problem in the conventional recording paper transportation, it has been attempted to employ high-precision gears or high-precision rollers, but even in such a case, conveying irregularities of about +/- 65 mu m occur. Therefore, in a high-resolution printer or a color printer, simply adopting such a method can be said to be insufficient as a countermeasure against interline pitch unevenness. There is also known a method of deliberately overlapping dots with respect to forwarding to prevent the occurrence of inter-line gaps. On the other hand, such a method can be shown to some extent in a fusing type color printer, When such dot overlapping is performed, there is a problem that a good image can not be obtained unless the deviation amount of the dot overlapping is set to about 30 mu m or less in the overlapping direction from the deviation amount 0.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a serial head type recording apparatus capable of minimizing occurrence of interline pitch unevenness in view of the above circumstances.

A serial head type recording apparatus of the present invention comprises a conveying roller for conveying a recording sheet, a motor rotating at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a feed amount of one line of the recording sheet by the conveying roller is set to an integer multiple of a circumferential length of the conveying roller and a width of the serial head is set to be equal to or greater than the conveying amount .

According to this, even if the conveying roller is eccentrically rotated, the recording sheet is conveyed by the amount corresponding to the circumferential length of the conveying roller when the conveying roller rotates by a constant number of times. Therefore, Is set to be an integer multiple of the circumferential length, it is possible to make the new line width by the conveying roller constant. When the width of the serial head is set to coincide with the feed amount, overlapping is not performed. On the other hand, when the width of the serial head is larger than the feed amount by, for example, one dot, One dot overlapping is performed.

The reduction ratio between the gears directly coupled to the conveying rollers and the gears engaged with the gears may be an integer ratio. According to this configuration, a small conveying unevenness caused by at least the gear directly connected to the conveying roller and the gear engaged with the same is regularly and reliably generated every one week of the conveying roller. Therefore, The new line width can be made constant.

In addition, the serial head type recording apparatus of the present invention includes a conveying roller for conveying a recording sheet, a motor rotating at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, A holding unit for holding data on the number of revolutions of the motor provided for each of the new lines from the reference position so as to reduce the conveying unevenness based on the conveying unevenness in each new line, the serial head type recording apparatus comprising: Rotation control means for controlling the rotation of the motor on the basis of the data and reverse rotation control means for reversing the motor by the total number of rotations of all the lines each time a single recording sheet ends, .

With such a configuration, by the rotation control means for controlling the rotation of the motor based on the data, the inter-lead gap and the like can be eliminated in one greeting. Here, since the data on the number of revolutions of the motor is provided from the reference position, the data is not helpful in the next row parameter if the next row is greeted as it is after one greeting. Therefore, every time the completion of the greeting of one sheet of recording paper, the motor is reversely rotated by the total number of rotations of all the lines, thereby securing the reference position.

In the serial head type recording apparatus of the present invention, the target number of pulses of real number corresponding to the actual displacement amount of the conveying roller is set to L, and by the pulse number correction value H of the real number corresponding to the target number of pulses L, The feed pulse number P of a real number serving as a basis of the number of supply pulses of an integer to be supplied to the motor for driving the roller is calculated as P = L + H.

Further, in the serial head type recording apparatus of the present invention, the target number of pulses of real number corresponding to the actual displacement amount of the conveying roller is set to L, and the number of pulses And L is calculated as L = P + A by the pulse number correction value A of the real number corresponding to the number of supply pulses P with the number of supply pulses of real number being P,

In addition, the serial head type recording apparatus of the present invention includes a conveying roller for conveying a recording sheet, a motor rotating at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a gear ratio between at least gears directly coupled to the conveying rollers and gears meshed with the gears is set to an integer ratio, and a plurality of revolving stages of the conveying rollers are provided in a plurality of Holding means for holding a pulse number correction value for the target number of pulses provided for each section so as to reduce the conveyance unevenness on the basis of the conveyance irregularities of each division at the time of division; The actual number of pulses is added to calculate the target number of pulses of real number representing the amount of conveyed recording paper of the next destination, Means for calculating a feed pulse number of a real number as a basis of the number of integral pulses to be provided to the motor by adding the target number of pulses representing the actual number of pulses and the pulse number correction value of the segment corresponding to the target number of pulses, Means for calculating the number of pulses for a new line from the number of supply pulses and generating an integer number of pulses by integrating the number of pulses to supply the number of integer pulses to the motor; And a means for correcting the number of times.

In this configuration, the conveying irregularities corresponding to the integer ratios periodically appear during one round of the conveying roller, since the reduction ratio between the gears directly coupled to the conveying rollers and the gears engaged with the gears is set to an integer ratio. Then, the pulse number correction value corresponding to the conveyance unevenness is maintained, and the rotation of the motor is controlled based on the correction value, so that conveyance unevenness can be substantially eliminated. In addition, since the target pulse number of the current HR position is supplied to the motor as a constant pulse number instead of a real number, the number of integer pulses is supplied to the motor so that the error can be solved do.

Means for counting the number of pulses provided to the motor by counting the reference position of the conveying roller until the recording sheet is conveyed to the first row personnel position; And a means for judging the target number of pulses at the real number value of the personnel position of the first line in addition to the pulse number correction value.

The actual number of pulses of one week of the conveying roller is subtracted from the target number of pulses when the target number of pulses of the real number indicating the amount of conveyance of the recording paper of the next round exceeds the pulse number of the real number of one week of the conveying roller, It is also possible to determine the segment by using the remaining actual number target pulse number and to calculate the number of supply pulses after correction by using the remaining actual number target pulse number.

The actual number of pulses of one week of the conveying roller is subtracted from the target number of pulses when the actual number of target pulses indicative of the amount of conveyance of the recording paper to the line feeder exceeds the actual number of pulses of one week of the conveying roller, The number of pulses after correction may be calculated by using the number of pulses provided to the motor with the reference position of the conveying roller as a count start point.

In addition, the serial head type recording apparatus of the present invention includes a conveying roller for conveying a recording sheet, a motor rotating at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a gear ratio between at least gears directly coupled to the conveying rollers and gears meshed with the gears is set to an integer ratio, and a plurality of revolving stages of the conveying rollers are provided in a plurality of A holding means for holding a pulse number correction value for the number of feeding pulses provided for each of the sections so as to reduce the conveyance unevenness on the basis of the conveyance unevenness of each section when the sections are divided, And a pulse number correction value of the section corresponding to the number of supply pulses, Means for adding the actual number of target pulses indicative of the transferred count of the lock to the target number of pulses of the current personnel position and the actual number of pulses for the next line to obtain the actual number of pulses of the recording destination, Means for acquiring a feed pulse number of a real number indicating a feed amount of a recording material to be fed to a new destination by obtaining a pulse number correction value for the number of feed pulses; means for subtracting, from the actual number feed pulse number, And means for calculating the actual number of pulses of the next line and for supplying the actual number of pulses of the preceding line to the motor.

In addition, the serial head type recording apparatus of the present invention comprises a conveying roller for conveying a recording sheet, a motor rotating at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a gear ratio between at least gears directly coupled to the conveying rollers and gears meshed with the gears is set to an integer ratio, and a plurality of revolving stages of the conveying rollers are provided in a plurality of A holding means for holding pulse number correction for the number of feed pulses provided for each section so as to reduce the conveyance unevenness on the basis of the conveyance irregularities for each section when the sections are divided; Means for obtaining by adding the number of supply pulses of the position and the pulse number correction value of the partition corresponding to the number of supply pulses, Means for calculating a feeding pulse number of a real number indicating a recording sheet conveyance amount of the provisional next destination by adding the actual number pulse number of the current recording position to the feed pulse number of the real number value of the current position, Means for calculating a target number of pulses at a new destination by adding the pulse number correction value of the segment corresponding to the number of supplied pulses to the number of supplied pulses; Means for calculating an error by subtracting the actual number of pulses of the preceding line from the actual number of pulses of the next line to calculate an error, Means for calculating the number of pulses of the numerical value of the quartz room and means for supplying the number of quartz numerical pulses to the motor The.

1 is a perspective view showing a mechanism of a general serial head type recording apparatus;

2 is a perspective view showing a printing mechanism portion of a general serial head type recording apparatus;

3 is a perspective view showing a recording paper conveyance system of the serial head type recording apparatus according to the first embodiment of the present invention.

4 is a graph showing recording paper conveyance unevenness.

5 is a block diagram showing a control system of a serial head type recording apparatus according to a second embodiment of the present invention;

6 is a perspective view showing a recording paper conveyance system of a serial head type recording apparatus according to a third embodiment of the present invention.

7 is a block diagram showing a control system of a serial head type recording apparatus according to a third embodiment of the present invention.

8 is an explanatory diagram showing the content of the pulse number correction value holding unit of the present invention.

9 is a flowchart showing a part of a first control example of the control unit according to the third embodiment of the present invention.

Figure 10 is a flow chart following Figure 9;

Figure 11 is a flow chart following Figure 10;

Figure 12 is a flow chart following Figure 11;

13 is a flowchart showing the concrete contents of step 15 in Fig.

14 is an explanatory diagram for explaining estimation of L ₀ in the third embodiment of the present invention;

15 is an explanatory diagram for explaining estimation of P ₁ in the third embodiment of the present invention;

16 is a diagram showing that P ₁ point is obtained by calculation of P ₀ + K using K obtained by adding a correction value H ₁ to L ₁ = L ₀ + Lg.

17 is a graph showing the relationship between the number of pulses corresponding to the target distance with the origin of the circumferential detection sensor of the conveying roller of the present invention and the amount to be corrected (converted into number of pulses).

18 is an explanatory diagram showing the relationship between the conveying roller and the compartment in the second control example of the control unit according to the third embodiment of the present invention;

FIG. 19 is an explanatory diagram showing the content of the pulse number correction value holding unit in the second control example of the control unit of the third embodiment of the present invention; FIG.

20 is a flowchart showing a part of a second control example of the control unit according to the third embodiment of the present invention.

FIG. 21 is a flowchart following FIG. 20; FIG.

Figure 22 is a flow chart following Figure 21;

Figure 23 is a flow chart following Figure 22;

Fig. 24 is a flowchart showing specific contents of steps 48 and 62; Fig.

25 is an explanatory view showing a serial-in-line principle by a serial head;

26 is an explanatory diagram of line-to-line stains.

Fig. 27 is an explanatory diagram showing a specific relationship between a conveying unevenness and an inter-line fluctuation. Fig.

28 is a graph showing the relationship between the number of motor pulses and the paper feed amount;

29 is a flowchart showing a first control example of the control unit of the fourth embodiment of the present invention.

30 is a flowchart showing a second control example of the control unit of the fourth embodiment of the present invention.

Fig. 31 is a diagram showing the relationship between the head width and the conveyance unevenness due to the third axis, showing a state in which about 0.2 cycles are generated as a phase difference; Fig.

Fig. 32 is an explanatory diagram showing the inter-row fluctuation (① to ① ', ② to ②', etc.) by the phase difference of the 0.2 period.

[0002] DESCRIPTION OF REFERENCE NUMBERS

1: conveying roller

2: Platen

3: gear group

4: Serial head

5: serial head support

6: Ink ribbon cassette

7: Shaft

8: Feed tray

(First Embodiment)

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. For convenience of explanation, FIG. 1 and FIG. 2 used in the conventional example are again used here.

1 is a perspective view showing a main part of a general serial head type recording apparatus. This serial head type recording apparatus comprises a conveying roller 1 for conveying a recording sheet (not shown), a platen 2 arranged in the vicinity of the conveying roller 1, a pulse motor (Not shown), a group of gears 3 for transmitting the rotational force of the pulse motor to the conveying roller 1, a serial head 4 for greeting the recording paper, An ink ribbon cassette 6 set on the head support 5, a shaft 7 for guiding the head support 5 in the transverse direction of the recording sheet, and a paper feed tray 8.

Fig. 2 is an explanatory view showing a human body mechanism. Fig. A recording sheet 10 is positioned between the serial head 4 and the platen 2. [ An ink ribbon 6a of the ink ribbon cassette 6 is interposed between the recording sheet 10 and the serial head 4. [ The serial head 4 and the ink ribbon cassette 6 are moved in the left direction (carriage scanning direction) in Fig. 2 and the ink ribbon 6a is wound on the side roll 6c unwound from the paper feeding roll 6b All. Then, when the party is greeted, the conveying roller 1 is driven and the recording sheet 10 is moved by a new line width. By repeating this operation, greeting is performed on the entire one recording sheet 10.

3 is a schematic perspective view showing the conveying roller 1, the gear group 3, and the pulse motor 11 constituting the recording paper conveyance system. In the serial head type recording apparatus of the present embodiment, when the roller diameter of the conveying roller 1 is A and the head printing width of the serial head 4 is B, the following relationship (1) have.

However, n is a natural number

Here, FIG. 4 is a graph showing the relationship between the target conveyance amount and the conveyance unevenness. As can be seen from this graph, when the circumferential length of the conveying roller 1 is 37.7 mm, conveying unevenness occurs within one week. However, when the conveying unevenness is observed at an interval of 37.7 mm, which is the circumference of the conveying roller 1, It can be seen that the value of the stain is almost the same. Thus, for example, the configuration of the present embodiment in which the feeding amount of one line of the recording sheet 10 by the conveying roller 1 is 37.7 mm, the n is 1, and the head printing width B is set to 37.7 mm , It is possible to prevent the occurrence of a new line gap.

In the case where the head print width B is set to be larger than 37.7 mm, for example, by one dot, one dot overlapping is performed in the adjacent row. Alternatively, the feed amount for one line may be set to an integer multiple as long as it is two times or three times as long as the circumferential length of the conveying roller 1, instead of one. The reduction ratio between the first gear 3a directly connected to the conveying roller 1 and the small gear portion of the second gear 3b engaged with the first gear 3a is set to an integer ratio . According to this, since a small conveying unevenness caused by such gears occurs regularly and reliably every week of the conveying roller 1, the conveyance width of the conveying roller 1 by the conveying roller 1 can be made substantially constant . It is needless to say that the reduction ratio in the third gear 3c and the fourth gear 3d may be an integer ratio.

(Second Embodiment)

Next, another embodiment of the present invention will be described. The configuration of the recording paper transport system and the head configuration are the same as those of the first embodiment, and therefore the description thereof is omitted.

5 is a block diagram mainly showing a control unit of the serial head type recording apparatus of the present embodiment. The motor rotational speed data holding section 21 holds the number of rotations (the amount of rotation) of the pulse motor 11 provided for each new line from the reference position so that the conveying unevenness is reduced based on the measurement of the conveying unevenness of the recording paper in each new line Maintain data. The above-described measurement and data storage processing is performed at the inspection and shipment stage of the product.

The control unit 22 performs rotation control for controlling the rotation of the pulse motor 11 based on the data. Then, the total number of rotations of the pulse motor 11 is measured, and the total number of rotations of the data is stored in the total number of rotations data holding section 23. Further, every time the recording of one recording sheet ends, the total number of rotations of the data is read from the total rotation number data holding unit 23, and the pulse motor 11 is rotated in the reverse direction by the total number of rotations Reverse rotation control is performed.

With such a configuration, since the rotation of the pulse motor 11 is controlled based on the data obtained in the measurement of the conveyance unevenness, the inter-lead gap and the like can be eliminated in one sheet of greeting. Here, since the data on the number of revolutions of the pulse motor 11 is provided from the reference position, if the next greeting is performed as it is after one greeting, the data is not helpful for the next succeeding parameter. Therefore, the pulse motor 11 is rotated counterclockwise by the total number of rotations of the forward rotation every time the completion of the greeting of one sheet of recording paper. As a result, the reference position is ensured in the next greeting, so that the leading gap or the like is solved even in the next greeting.

(Third Embodiment)

Next, another embodiment of the present invention will be described.

Fig. 6 is a schematic diagram showing the relationship between the conveying roller 1 constituting the recording paper conveyance system of the present embodiment, the group of gears 3, the pulse motor 11, A paper sensor 31, and a paper sensor 35. As shown in Fig. The reduction ratio of the first gear 3a directly connected to the conveying roller 1 and the gear ratio of the second gear 3b engaged with the first gear 3a is set to an integer ratio. In addition, the circumferential detection sensor 31 includes a sensor plate portion 31a and a plate sensor portion 31b. The sensor plate portion 31a is formed of a disk having one cutout portion (reference position), and the center of the sensor plate portion 31a is located on the extension of the central axis of the conveying roller 1 and the conveying roller 1 or the first gear 3a, So that the conveying roller 1 makes one rotation when the conveying roller 1 makes one rotation. The plate sensor portion 31b generates a signal when detecting the cut-out portion formed on the sensor plate portion 31a, and notifies the circumference of the conveying roller 1 by the signal. In addition, the paper sensor is adapted to detect the leading edge of the recording paper at the personnel start position.

7 is a block diagram showing the control unit of the serial head type recording apparatus of the present embodiment at the center. The pulse number correction value holding section 32 holds the number of pulses provided for each section so as to reduce the conveyance unevenness based on the measurement of the conveyance unevenness of the recording sheet 10 for each section when the conveying roller 1 is divided into a plurality of circles The correction value H is maintained.

Fig. 8 shows an example of pulse correction values for each section (11. 25 [deg.]: 360/32 at an angle) when the circumference of the conveying roller is divided into 32 sections. The measurement of the conveyance unevenness and the storage of the pulse number correction value based on the conveyance unevenness in the holding section 32 are carried out at the product shipping stage. Further, when the relationship between the number of pulses corresponding to the target distance with the cut-out portion of the circumference detection sensor 31 as the origin and the amount to be corrected (pulse conversion) is shown, for example, a graph as shown in Fig. 17 is obtained. In the figure, a curve having a fine waveform is a correction curve when the reduction ratio of all gears is set to an integer ratio. On the other hand, a curve having a smoother waveform is a correction curve when the reduction ratio of the small gear portion of the second gear is an integer ratio.

The pulse number counter 34 measures the number of pulses supplied to the pulse motor 11 every detection of the conveying roller by the sensor 31. [ The control section 33 obtains the pulse number correction value of the section according to the rotation amount of the conveying roller 1 based on the number of pulses and controls the rotation of the pulse motor 11 on the basis of the pulse correction value.

As described above, in the serial head type recording apparatus of this embodiment having such a configuration, the first gear 3a directly connected to the conveying roller 1, And the gear ratio of the small gear portion of the second gear 3b meshed with the first gear 3b are constant ratios. Therefore, uneven conveyance due to the eccentricity of the gear periodically appears in accordance with the integer ratio during one round of the conveying roller 1. Therefore, even when the new line width corresponds to 0.45 rotation of the conveying roller, the motor rotation control is performed using the pulse number correction value of each section corresponding to the conveyance unevenness in this one week range, (When the conveying roller has rotated a predetermined number of times to the personnel start position), the pulse motor 11 is properly rotated and the target The amount of rotation of the conveying rollers can be reduced to reduce the gap between the conveying rollers.

Next, specific details such as the basic thinking method under the control of the control section 33, the reduction ratio in the gear group 3 and the diameter of the conveying roller 1 will be described.

(1) The management of the target position of the recording sheet is performed by L (target number of real number pulses). L is the target displacement of the conveying roller, and 0? L? 4360 is expressed by the number of pulses (real number) with the detection point of one circumference detected by the circumference detection sensor as the origin. 04734.

Further, the value of 4360.04734, which is the number of pulses for the conveying roller to circulate, is provided as follows. If the total reduction ratio I in the gear group 3 is 0.0055 and the step angle of the motor is 15 占, it can be obtained by 360 占 / (15 占 I).

Further, assuming that the new line width is Lg equivalent to 95 dots and the resolution is 144 dpi, 25.4 mm 占 95/144 dots = 16.7569444 ... Mm and roller diameter = 12 ± 0 to 4360.04734 × 16.7569444 / 12π = 1938. 0051 ... And the number of pulses of the line break width becomes 1938. 0051. Actually, since the step of measuring the roller diameter is omitted, and there is a difference between the measured diameter and the diameter actually contributing to the conveyance, the number of pulses of the line width is obtained by actual measurement as follows. That is, as shown in Fig. 28, an ideal straight line is substituted by a straight line approximating the actual conveyance amount by a first order. Then, a pulse corresponding to 16.7569444 is obtained from the slope of this straight line.

(2) The number of pulses of the pulse motor is controlled by P (the number of pulses after correction of the real number). P denotes the number of pulses (real number) obtained by computation, with the circumference detection point by the circumference detection sensor as the origin, 0? P? 04734, but the pulse itself which can be provided by the motor is an integer.

(3) When the pulse correction value in FIG. 8 is H, H = P-L. Therefore, the number of pulses P to be provided to the motor becomes P = L + H.

(4) Let P be P ₀ (P ₀ is an integer) when the paper sensor 35 detects the leading edge of the recording paper. Then, the actual roller displacement L ₀ when this P ₀ is provided is estimated.

(5) L ₁ = L ₀ + Lg where L ₁ is the sending party. When L ₁ , P ₁ is estimated as to how the number of pulses should be. Newline minute pulses are in, but K = P ₁ -P _0, that when one of the Integer K as Ka, actually the number of pulses because the pulses provided to the motor is an integer P ₁ = P ₀ + Ka.

⑥ Provide pulse Ka to the motor. Since Ka is an integer, the roller displacement at that time does not become L ₁ . Therefore, L ₁ is estimated from P ₁ .

⑦ Repeat the above process.

⑧ When the reduction ratio of any gear ratio is then constant by detecting the circumference of the conveying roller in the first and resets the P wherein P ₀ the obtained count value is not used in the control example. On the other hand, when only a part is the integer ratio, P is reset every time the roller circumference is detected. Therefore, step 32 to be described later is omitted in this case.

Next, the detailed control contents of the control section 33 will be described with reference to flowcharts of Figs. 9 to 13. Fig. First, it is determined whether or not there is a paper feed command (step 1). If there is a paper feed command, the pulse motor 11 starts to be driven (pulse supply) (step 2). Next, the number of pulses P supplied to the pulse motor 11 is counted by the pulse number counter 34 (step 3). Then, whether or not the cutout portion (reference position) of the conveying roller 1 is detected is detected by the circumferential detection sensor 31 (Step 4).

If the reference position is detected, a process (reset process) of P = 0 is performed (step 5). Then, it is judged whether or not the recording tip is detected by the paper sensor 35 (step 6). If a recording sheet tip end is detected, it performs a process of P ₀ = P (Step 7). That is, the actual number of pulses provided to the pulse motor is set to P ₀ until the leading edge of the recording paper is detected.

On the other hand, if the reference position is not detected in step 4, it is determined whether or not P4360.04734 is satisfied (step 8). If YES, the process proceeds to step 6. If NO, an error process is performed (step 9). If the leading edge of the recording paper is not detected in Step 6, the process proceeds to Step 2 to continue the driving of the pulse motor. Further, the process proceeds from the step 4 to step 8, and goes to step 6, as also when in the step 7 to P ₀ = P wherein P is detected the reference position of the conveying roller 1 in a one weeks detecting sensor 31. The paper The number of integral pulses supplied to the pulse motor is the number of pulses until the leading end of the recording paper is detected by the sensor 35. [

Next, calculation processing of the index i, j is performed (step 10). I is obtained by calculation of i = I _nt (P ₀ /(4360.04734/32)), and j is calculated by calculating j = (i + 1) - {I _nt (i + 1) / 32) I ask. J is calculated as 1 when i is 0, 2 when i is 1, and 0 when i is 31. And, those i, j which will exhibit if the displacement is one where the conveying roller P ₀ corresponding to a second pulse minutes several compartments.

Next, the roller displacements L (i) and L (j) at the indexes i and j are calculated (step 11). L (i) is obtained by calculation of L (i) = (4360.04734 / 32) x i, and L (j) is calculated by calculation of (4360.04734 / 32) x j. That is, since one compartment corresponds to 4360.04734 / 32 pulses, the amount of roller displacement corresponding to that compartment is obtained by multiplying the number of compartments by the number of compartments.

Next, the pulse number correction values H (i) and H (j) of the indexes i and j are obtained from the post-correction list of FIG. 8 (step 12). For example, if H (1), -1.2345 is obtained.

Next, the corrected pulses P (i) and P (j) of the index i and j are calculated (step 13). P (i) is obtained by calculation of P (i) = L (i) + H (i) and P (j) is obtained by calculation of P (j) = L (j) + H

Next, processing for securing 0P4360.04734 is performed (step 14). That is, if P (i) 0, P (i) = P (i) +4360.04734 is processed and P (j) = P (j) -4360 if P (j) is 4360.04734. 04734 is performed.

Next, it is judged whether or not P ₀ is within the section of P (i) to P (j) (step 15). As shown in Fig. 13, this process first determines whether or not i = 31 (step 151). If NO, the process proceeds to step 153. On the other hand, if YES is the F = 0 As a general rule, by the processing of step 152, but perhaps P ₀ -P (i) _0, a F = -1, and if ever P (j) -P _{0 0} to F = 1 The process proceeds to step 153. [

In step 153, it is determined whether or not i = 0. If YES, F = 0 is set in principle. However, if P ₀ (4360.04734 / 32) x 31, F = -1, and if P ₀ P (j), F = 1 is set (step 154). Further, in step 153. As a general rule, if a NO to F = 0, however, ever be as F = -1 if P ₀ P (i), and, perhaps to as F = 1 if P ₀ P (j) (step 155) returns .

Further, in the processing of the step 15 (151 to 155), F = 0 means that it is in the section, F = 1 means that it is outside the section, and the plus and minus means the direction away.

The calculation of i = (i + F) -32 x I _nt ((i + F) / 32) and the calculation of j = (i + F) -32 x I _nt 32) (step 16). That is, while i is i and j is j, i is outside the interval (F = ± 1), the interval is corrected.

Next, processing is performed to estimate the roller displacement L ₀ from the number of pulses P ₀ (step 17). Specifically, the estimation of the L ₀ (L (i), P ( i)) (L (j), P (j)) (L 0, P 0) from. 14, the shift from P (i) to P (j) is regarded as being linear, and the shift amount of P ₀ with respect to P (i) and the shift amount with respect to L (i) ₀ , and this L ₀ is obtained (first approximation). That is, L ₀ -L (i): L ₀ can be estimated from P (j) -P (i) : L (j) -L (i) = P 0 -P (i).

Next, a process of printing a line by scanning the serial head at the found L ₀ is performed (step 18). After that, it is judged whether or not the scheduled row has been greeted (step 19). If the scheduled row is greeted, the sheet is discharged (step 24). If the scheduled row is not printed, Minute, and the number of pulses to be supplied by the pulse motor is calculated.

First, the line width Lg is read (step 20). The new line width Lg is 1938.0051 in terms of the number of pulses, as described above. Then, the displacement L ₁ of the destination to be collated is calculated (step 21). L ₁ is obtained by a formula of L ₁ = L ₀ + Lg.

Next, it is determined whether L ₁ 4360.04734 is satisfied (step 22). This corresponds to checking whether the conveying roller 1 has crossed the reference position during the line break. If more than a reference position, is replaced with L ₁ as the value which L ₁ -4360.04734 (step 23).

Next, the indexes i and j are calculated (step 25). This processing is obtained by calculation of i = I _nt (L _{1 /} (4360.04734/32)) as in step 10, and j is calculated as j = (i + 1) - {I _nt (i + 32. Next, the roller displacements L (i) and L (j) at the index i, j are calculated (step 26). This processing is obtained by the calculation of L (i) = (4360.04734 / 32) x i and the L (j) = (4360.04734 / 32) x j as in step 11.

Next, the pulse number correction values H (i) and H (j) of the indexes i and j are obtained (step 27). This process may be obtained from the list of FIG. 8 as in step 12. Then, the corrected pulses P (i) and P (j) of the index i and j are calculated (step 28). This process can be obtained by calculation of P (i) = L (i) + H (i) and calculation of P (j) = L (j) + H (j).

Next, (L (i), P (i)) (L (j), P (j)) is estimated from the P ₁ (L _1, P ₁₎ (step 29). L ₁ is already obtained in step 21. As shown in Fig. 15, the estimation process of P ₁ is carried out in such a manner that the change from P (i) to P (j) is considered to be linear, and the shift amount of L ₁ to L (i) as to correspond to the shift amount of P _1, and estimates the P ₁ (linear approximation).

Next, the line feed pulse number K (real number) is calculated (step 30). K is obtained from K = P ₁ -P ₀ . When it exceeds the roller, since P ₁ -P ₀ 0 is obtained, K = 4360.04734 + P ₁ -P ₀ . However, since the number of pulses provided to the pulse motor is an integer, the integer number of pulses Ka is obtained (step 31). Ka is obtained by processing I _nt (K + 0.5). Addition of 0.5 means integerization after rounding off.

Next, the actual number of pulses of the next line is corrected (step 32). Specifically, P ₁ = P ₀ + Ka by newly obtaining the P _1, if P ₁ 4360.04734 P ₁ = P ₁ performs the edit processing in -4360.04734. Then, in step 33, the pulse number Ka is supplied to the pulse motor. If the reduction ratio of all the gears is an integer ratio, the process of P ₀ = P ₁ is executed (step 34) and the process proceeds to step 10. In addition, when only the gears have a reduction ratio equal to the integral ratio, P is reset each time one roller is detected. In this case, step 32 is omitted. P ₁ uses the actual count value. The correction processing of step 32 is performed by replacing the value of P _{0 by} the value of P _{1 in} the above-mentioned step 34 to cope with the processing of returning to step 10, and at the same time, setting P ₀ in the range of 0P ₀ 4360.04734 It is because we have to accept as.

8, the actual roller displacement amount (the position of the actual recording sheet) L (the actual recording sheet position) is calculated based on the number of pulses P ₀ (integer) supplied to the motor when the leading edge of the sheet is detected, estimating a _0, and the position of the next recording paper by adding a new line width L ₀ (roller displacement), and calculates the L _1, Kami after correction to be as the L ₁ supplies the pulse number P ₁ correction table in Fig. 8 The number of pulses K to be supplied at this time is obtained by P ₁ -P ₀ , and the number of pulses to be supplied to the motor is set to Ka as the number of pulses to be supplied to the motor as Ka.

If the number of pulses K can be provided by a pulse motor (actually, this can not be done), the roller displacement after the line feed becomes L _1. However, since the pulse motor is driven by the pulse number Ka which is an integral number as described above, The displacement after the new line does not become L ₁ . Therefore, if L ₁ is given as * L ₀ in the calculation for the next new line (* L ₁ = * L ₀ + Lg), the error between the actual displacement and L for managing this becomes large. Thus, the process of P ₀ = P ₁ is performed in step 34, and the process returns to step 10 to reach step 17, where L ₀ is again estimated based on P ₀ , and based on this, L ₁ is calculated. In FIG. 16, K obtained by adding the correction value H ₁ to L ₁ = L ₀ + Lg is used and P ₁ point is obtained by calculation of P ₀ + K.

Assuming that P ₀ = P = 136 in step 7, i = 0 and j = 1 in step 10 and L (0) = 0 and L (1) = 136.25148 in step 11, H (0) = 0 and H (1) = - 1.2345 in step 12 and P (0) = 0 and P (1) = 135.01698 in step 13. Therefore, no correction is made in step 14. Further, in the section determination in the step 15, since the P ₀ 136 is not within the range of 0 to 135.01698, the section correction is required. Specifically, and in step 153 in YES, since in step 154 to _{P 0 (136) P (j} ) = 135.01698 are as F = 1, at Step 16 i = (0 + 1) -32 × 0 = 1, j = (1 + 1) - 32 x 0 = 2. That is, i = 1 and j = 2 are modified.

Next, a modified example (second control example) of the control example (first control example) will be described with reference to Figs. 18 and 19. Fig. The modification of this modification is as follows.

① Change point 1

In the first control example, one week of the conveying roller is divided by the number of divisions 32 so that the entire section is accurately shaped to correspond to one round of the conveying roller.

In the second control example, 140.4291531 pulses, which is a value obtained by dividing the number of pulses by 32 (4493.7329 pulses due to changes in the roller diameter, step angle, and reduction ratio in this example, It is shifted up and treated as an integer. That is, 140.4291531 x 8? 1123.4. And it is 1024 which is good to finish. Then, 1024 is shifted down by 3 bits, and the number of pulses in one partition is set to 128 pulses. If the number of pulses per revolution of the conveying roller is 4493.7329 divided by 128 pulses, then 35.107 ... , So the number of compartments was 36. That is, in the relationship between the circumference of the conveying roller and the section of the conveying roller in this case, as shown in Fig. 18, the total of the front section exceeds the circumference of the conveying roller, and the first section and the 36th section are overlapped with the same part of the conveying roller . The pulse number correction table in this case is as shown in Fig.

② Change point 2

In the first control example, L ₀ is estimated from the pulse count P ₀ at the time of detecting the leading edge of the recording sheet.

In the second control example, L ₀ 'obtained by processing as described below is set to L ₀ . Originally, P ₀ = L ₀ + H _0, but L ₀ and H ₀ are unknown (because H ₀ is provided for L ₀ ). Thus, by using the L ₀ P ₀ as a substitute sets of H ₀ 'is H _0. L ₀ = P ₀ -H ₀ to L ₀ ? L ₀ '= P ₀ -H ₀ '. This L ₀ 'is used as a substitute for L ₀ . If this method is adopted, the error is somewhat present, but the processing is completed with a simple process. In addition, the L ₀ with "" obtains, from the _{L 0 = P 0 -H 0,} L 0 ≒ L 0 " is using H ₀ = L ₀ 'again, to reduce the error in L ₀ There -H _0" L ₀ ". By repeating this, the error becomes smaller.

③ Change point 3

In the first control example, the target number of pulses L ₁ of the real number representing the recording paper conveyance amount of the new destination is added by adding the real number pulse count Lg of the new line to the real number target pulse number L ₀ of the current personnel position, ₁ is longer than _one minute of the roller, a process (step 23) is performed in which L ₁ = L ₁ - the pulse number of one week of the roller.

The second control example, the by the change point 1, given that the number of index interval total pulses less than one circumference of the roller, the L ₁ is more than the index 36 × 128 pulse = 4608 L ₁ = L ₁ fixes to the roller one weeks minute pulse . For example, if L ₁ = 4600, the index interval is i = 35 ~ j = 36 is to be used, is L ₁ = 4610, 4608, and in the L ₁ to L ₁ = 4610-4493.7329 = 116.2671, an index interval i = 0 to j = 1.

④ Change 4

In the first control example, the correction of the target number of pulses at the current HR position performed in response to the supply of the integer number of pulses, not the real number, to the motor is set to P ₀ = P ₁ in step 34 and the processing in steps 10 to 17 the via was performed by estimating from the L ₀ P _0. That is, the difference K (real number) from the current number of pulses P ₀ is obtained by calculating the corrected number of pulses P ₁ (real number) (P ₁ = L ₁ + H ₁ ) from the amount of roller displacement L ₁ = L ₀ + (Ka = I _nt (K + 0.5)), P ₁ as the integer number of pulses is obtained corresponding to the fact that the integer number of non-real number pulses is supplied to the motor ((K = P ₁ -P ₀ ) P ₁ = P ₀ + Ka i.e., substitution of an integer), and it estimates the L ₀ from P ₀ to P ₁ of this constant as P _0.

In the second control example, P ₁ '= P ₀ + Ka (substitution with an integer), and E = P ₁ ' - P ₁ (real number) calculation is performed. That is, by extracting a fraction less than a decimal point, this corresponds to obtaining a difference by supplying the integer number of pulses instead of a real number. Then, the process of L ₁ '= L ₁ + E is performed, and this L ₁ ' is used as a substitute for L ₁ , and this L ₁ is set as L ₀ to obtain the amount L ₁ of the roller displacement at the next destination.

⑤ Change 5

In the first control example, the resetting of the counter (hereinafter referred to as reference point detection) when the circumference of the conveying roller is detected in steps 4 and 5 is not performed after that step. This method of not detecting the reference point has no problem since the gear ratio of the gear group 3 is an integer ratio (ratio between the roller axis and the other axis) in all gears. That is, if the number of pulses of one week of the conveying roller is supplied to the motor, the conveying roller always circulates.

However, there is an error from the number of significant digits in the number of pulses per one revolution of the roller, and it is rather rather undesirable to set the gear ratio to a constant ratio for all the gears of the gear group 3 (since the deterioration of the gear is promoted) , The integer ratio is secured between the first axis and the second axis or the third axis, so that even if the number of pulses of one week of the conveying roller is supplied to the motor, the conveying roller can not necessarily be circled.

Thus, in the second control example, reference point detection is performed every time, and the pulse counter is reset. That is, as described in the above-described modification point 3, L ₁ = L ₁ - is corrected to the number of pulses _{per one} roller, P ₁ is estimated from L ₁ , and the conveying roller is rotated by P ₁ . The pulse counter is reset when the roll of the roller is detected during rotation, and the amount of displacement of the conveying roller by P ₁ after the reference point has passed is obtained by the pulse counter. Then, the process is repeated again with the pulse number (P ₀ ) by the pulse counter. Also, in this case, because the L ₁ is generated based on P ₀ actually detected by the pulse counter, the corrected L ₁ stated at the change point 4 becomes unnecessary.

The contents of the second control example described above will be described based on the flowcharts of Figs. 20 to 24. Fig.

First, as shown in Fig. 20, the pulse motor is driven after the paper feed start command (step 41). The pulse number counter 34 (see FIG. 7) which always counts the number of pulses supplied to the pulse motor is reset when the reference position of the conveying roller is detected by the circumferential detection sensor 31 (step 42). This process is always performed. It is determined whether or not the paper sensor 35 has detected the leading edge of the recording paper (step 43). If it is detected, P ₀ = P is processed (step 44).

Next, the estimation process of the roller displacement L ₀ is started from the pulse count P ₀ . First, as shown in FIG. 21, the value of P ₀ is inserted as the roller displacement L ₀ '(hereinafter referred to as L ₀ ) (step 45). Next, 1 is added as the number m of repetition (step 46). In addition, the insert has a value of L ₀ 'as an argument displacement Lx (step 47), calculates the pulse number correction value acquired from the Hx displacement Lx (step 48). This step 48 is concretely performed by the processing of steps 73, 74 and 75 shown in FIG. These processes correspond to the division determination processing in the first control example.

Next, a pulse number correction value H ₀ 'Add the value of the Hx (step 49). Then, an estimate L ₀ is obtained by P ₀ and H ₀ '(step 50). Next, it is judged whether or not the number of repetition times m has reached a predetermined number N (step 51). If the predetermined number of times is not reached, the estimation L ₀ is set to L ₀ '(step 53), m is incremented (step 54), and the process returns to step 47 to repeat the generation process of estimation L ₀ . On the other hand, if it is a predetermined number of times, the estimation L _{0 is set} to L ₀ (step 52).

The processing of the above-described steps 45 to 52 corresponds to the processing of the steps 10 to 17 in the first control example, and also shows the concrete contents of the above-mentioned change point 2.

Next, the calculation processing of the roller displacement L _{1 at} the line-to-line is performed. That is, as shown in Fig. 22, after one row is printed (step 55), it is judged whether or not the scheduled row is printed (step 56). If the scheduled row is printed, to read by adding (step 57) L _0, and Lg is obtained a line break processing roller displacement L ₁ (step 58). Then, it is determined whether or not the maximum index 36 displacement L ₁ (36) exceeds 4608 (see FIG. 19) during the line break (step 59). When the reference position of the conveying roller is detected in the paper conveyance to the new line, the process proceeds to step 61 while the process of L ₁ = L-Lr (step 60) is performed, The process directly advances to step 61. [ The above-mentioned Lr is the displacement of one roller (4493.7329 pulses).

The processing of the above-described steps 59 and 60 corresponds to the above-mentioned change point 3.

Next, as shown in Fig. 23, the number of the rearrangement pulses (the correction of the real number serving as the basis of the integer number of pulses to be provided to the motor) is calculated from the roller displacement of the destination of the rearrangement The number of post-pulses) P ₁ . First, let L ₁ obtained in step 60 of FIG. 22 be L ₁ and introduce the value as a factor Lx (step 61). The pulse number correction value Hx is obtained from the argument displacement Lx (step 62). This step 62 is concretely performed by the processing of steps 73, 74, and 75 shown in FIG. Next, the value of Hx is entered as H ₁ (step 63). Next, the number of lines P ₁ (real number) of the line to be traced is obtained by processing P ₁ = L ₁ + H ₁ (step 64). Next, the number K (real number) of the line-to-be-collated line is obtained by processing K = P ₁ -P ₀ (step 65). If it is 0K, then K is added to 4493.7329. Next, an actual new-line pulse Ka (integer) is obtained by processing Ka = I _nt (K + 0.5) (step 66). Next, the error E is rounded off to obtain E by the processing of E = Ka-K (step 67). Then, the line feed processing pulses modification of the L ₁ caused by the Integer of _{P 1 L 1 = L 1 +} E is carried out by a process (step 68).

Then, a process of supplying pulses to the motor by the number of Ka is started (step 69), and it is judged whether or not the reference position of the conveying roller is detected by the circumference detection sensor 31 during this pulse supply (step 70). If it is detected, the process of P ₀ = P (count number counted by the pulse number counter 34) is performed (step 71) and the process goes to step 45. On the other hand, if not detected, the process of L ₁ = L ₀ is performed (step 71) and the process proceeds to step 55.

The processes of the above-mentioned steps 61 to 66 correspond to the steps 25 to 31 of the first control example. Step 67 and step 68 are processes corresponding to the change point 4 in which calculation of L is simplified again based on P after step 34 → step 10 of the first control example. Step 71 is a process corresponding to the change point 5.

In this embodiment, the number of divisions is 32 or 36. However, the number of divisions is not limited to 32 or 36, but may be 4361 or 4494 corresponding to the number of pulses per revolution of the conveying roller.

In addition, although the conveying of the recording paper is carried out by only the conveying roller (no-load state), and the line-by-line pulse Lg serving as a reference is obtained by the first approximation, the feeding roller is moved vertically during the initial performance of one conveyance, Load, the slip of about 0.04% occurs. This corresponds to a slip of 16.68 mm when one row is 16.7 mm, which corresponds to about 0.8 pulses when converted into the number of pulses.

Therefore, it is preferable that a reference DELTA Pg is added to the reference new-line pulse Lg throughout this execution.

On the other hand, in the latter half of one sheet, the conveyance is performed by only the conveying roller (capstan roller), so that it is unnecessary to change the reference line-by-line pulse.

In the middle row, a state in which the sheet feeding roller is not in a state of being loaded continues to occur. In this case, it is preferable that the reference pulse Lg is given a substantial amount of DELTA Pg / 2 (the denominator may be a numerical value according to the ratio occupied by the state).

(Fourth Embodiment)

Next, another embodiment of the present invention will be described. In the third embodiment, the target number of pulses of the real number corresponding to the actual displacement amount of the conveying roller is set to L, and by the pulse number correction value H of the real number corresponding to the target number of pulses L, The number P of supply pulses at the real number on the basis of the number of supplied supply pulses of the providing integer is calculated at P = L + H, and the number of pulses for the next line is calculated by P at the current P and P at the next row. 4, the target number of pulses of real number corresponding to the actual displacement amount of the conveying roller is set to L and the number of supply pulses of the real number serving as the basis of the constant number of supply pulses provided to the motor for driving the conveying rollers is P , The L is calculated at L = P + A by the real number pulse number correction value A corresponding to the number of supplied pulses P, and even if the P is supplied to the motor, the actual L And the next row By the L and calculates the number of pulses of the line feed time. The A may be stored in the storage unit in the same format as in Fig.

Fig. 29 is a flowchart showing a first control example of the present embodiment, which is shown in correspondence with Fig. 9 to Fig. 13, and is simplified in order to avoid overlapping of explanations. That is, in the same manner as the processing up to step 7 in Fig. 9, the processing of P ₀ = P is performed (step 101). Next, processing of L ₀ = P ₀ + A ₀ is performed (step 102). That is, A ₀ corresponding to P ₀ is acquired based on the pulse P ₀ supplied to the motor, and the actual roller displacement amount L ₀ is acquired. Then, by the process of L ₁ = L ₀ + Lg, the actual amount of roller displacement at the line feed destination is obtained (step 103). Next, using the L ₁ to P ₁ is obtained instead of the index i, j (step 104). Then, calculation processing of L (i) = P (i) + A (i) and L (j) = P (j) + A (j) is performed (step 105). Further, (L (i), P (i)), (L (j), (P (j)) is obtained for P ₁ when L ₁ il by a first-order approximation from (step 106).

Next, by the calculation of K = P ₁ -P ₀ , the number of real number pulses for the new line is obtained (step 107). Then, K is rounded off and integerized to obtain Ka (step 108), and new line Ka is executed (step 109). Further, the process of P ₁ = P ₀ + Ka is performed (step 110), and P ₀ = P ₁ is set (step 111), and the process returns to step 101.

Also, in the serial head type recording apparatus in which such control is performed, even in the case of a serial head type recording apparatus, there are a conveying roller for conveying the recording sheet, a motor rotating at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, And a serial head for performing a greeting to the user. In addition, a reduction ratio between at least gears directly coupled to the conveying roller and gears engaged with the gears is set to an integer ratio. 7, and the control unit 33 may be configured to realize the means for executing the process corresponding to each step described above.

Fig. 30 is a flowchart showing the first control example of the present embodiment, which is shown in correspondence with Fig. 20 to Fig. 24 and is shown in a simplified form in order to avoid overlapping of explanations. In other words, the process of P ₀ = P is performed in the same manner as the process up to step 44 in FIG. 20 (step 121). Next, processing of L ₀ = P ₀ + A ₀ is performed (step 122). Next, by the process of P ₁ = P ₀ + K ', the number of supply pulses of the next destination is acquired (step 123). It should be noted that K 'is a standard line-by-line pulse, but the line width Lg is used instead. Next, the actual roller displacement amount is calculated (step 124), assuming that L ₁ = P ₁ + A ₁ , and that the above-mentioned P ₁ pulse has been provided by the motor.

Then, the error E of the new line width Lg is obtained by the processing of Lg = L ₁ -L ₀ (step 125) and the processing of E = Lg-Lg (step 126) (K = K'-E) to obtain the number K of real pulses of a new line (step 127). K is rounded off and integerized to obtain Ka (step 128), and a new line of Ka is executed (step 129). Further, the process of P ₁ = P ₀ + Ka is performed (step 130), and P ₀ = P ₁ is set (step 131), and the process returns to step 121.

In a serial head type recording apparatus in which such control is performed, a conveying roller for conveying the recording sheet and a motor for rotating a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, And a serial head for performing greeting. In addition, a reduction ratio between at least gears directly coupled to the conveying roller and gears engaged with the gears is set to an integer ratio. 7, and the control unit 33 may realize the means for executing the process corresponding to each step described above.

However, since the deterioration of the gears is promoted, it is not preferable to set the reduction ratio of all the gears to an integral ratio with respect to the roller. Therefore, in the above-described embodiment, at least the roller shaft and the gear ratio of the small gear meshed with the roller shaft are made constant.

However, the conveying unevenness on the third axis is also negligible to about 6 mu m. So, in the case when the conveyance amount l ₃ (period) of the three-axis in this case first in Korea, when determining the ratio of the roller axis a third axis so as to optimize the personnel width and l _3, it is possible to fairly reduce the conveying dirt, Moreover, since it is not a constant ratio, it does not promote deterioration of the gear.

Distance of one note l ₃ =? 12.15? X (13/52) x (19/41) = 4.4222 mm

(52) → the number of teeth of the large gear of the first axis

(13) → the number of teeth of the small gear of the first axis

(41) → the number of teeth of the large gear of the second shaft

(19) → the number of teeth of the small gear of the second axis

The personnel width B = 95 dots x 25.4 mm / 144 dpi = 16.7569 mm. Further, B / l ₃ = 3.79. Therefore, the phase difference is about 0.2 cycles as shown in Fig.

A phase difference according to 0.2 × l ₃ between the lines 32 is a variation that can be thought of as to ① ① ', ② to ②' ... 5 & cir & 5 ', and the variation between lines in calculation is 6 mu m x 1.175 = 7 mu m. Therefore, it is most preferable that the phase difference is 0, and the roller diameter, the reduction ratio of the third axis, and the envelope width are determined so that B / l ₃ = n (n is an integer). In addition, 1.175 is a multiplier indicating the maximum influence by the phase calculated.

Here, if the reduction ratio of the third axis and the roller diameter are determined by the printer, the greasing width can be adjusted.

mdot 占 25.4 mm / 144 dpi = n 占 4.4222 mm

When n is set to 4 close to 3.79, m = 100 dots

When n is set to 3 close to 3.79, m = 75 dots

Thus, even if the gear ratio can not be reduced, the influence of the conveyance unevenness can be reduced.

It is also applicable to the fourth and fifth axes. The axis near the roller axis should be prioritized. When the greedy width is set in correspondence with the third axis, for example, a reduction ratio or the like may be set for the fourth axis and the like.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to reduce undesired overlapping of an image caused when a conveyance amount of a recording sheet is larger than a required new line width, or when the recording sheet is small, and the image quality can be improved .

Claims (13)

A motor for rotating the motor at a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, and a serial head for performing printing on the recording sheet, In the head type recording apparatus, the feeding amount of one line of the recording sheet by the feeding roller is set to an integral multiple of the circumferential length of the feeding roller, and the printing width of the serial head is set to be equal to or more than the feeding amount Type recording head. The serial head type recording apparatus according to claim 1, wherein a gear ratio between at least gears directly connected to the conveying roller and gears engaged with the gears is an integer ratio. A serial head type recording apparatus having a conveying roller for conveying the recording sheet, a motor rotating by a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Holding means for holding data relating to the number of revolutions of the motor provided for each new line from the reference position so as to reduce the conveying unevenness on the basis of the conveyance unevenness in each new line; And a reverse rotation control means for reversely rotating the motor by the number of total rotations of all the lines each time the completion of the greeting of one sheet of recording paper is completed. The target number of pulses of the real number corresponding to the actual displacement amount of the conveying roller is set to L and the integer number of the supply pulses to be supplied to the motor for driving the conveying roller by the pulse number correction value H of real number corresponding to the target number of pulses, And the number P of supply pulses at the real number which is the basis of the number is calculated at P = L + H. The target number of pulses of real number corresponding to the actual displacement amount of the conveying roller is set to L and the number of supply pulses of the real number serving as a basis of the number of constant number of supplying pulses to the motor for driving the conveying roller is set to P, And said L is calculated at L = P + A by a real number pulse number correction value A corresponding to the number of pulses P. 2. The serial head type recording apparatus according to claim 1, A serial head type recording apparatus having a conveying roller for conveying a recording sheet, a motor rotating by a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a gear ratio between at least gears directly coupled to the conveying rollers and gears meshed with the gears is set to an integer ratio and at least one of a plurality of conveying rollers A holding means for holding a pulse number correction value for the target number of pulses provided for each section so as to reduce the conveyance unevenness based on the unevenness, and the actual number of pulses for the next line to the target number of pulses at the current number of personnel positions The target number of pulses of the real number representing the amount of conveyed recording paper of the new destination is calculated, and the target value of the real number Means for calculating a feed pulse number of a real number as a basis of the number of integral pulses to be supplied to the motor by adding the number of pulses and the pulse number correction value of the section corresponding to the target number of pulses; Means for calculating the number of pulses for a new line, integrating this to generate an integer number of pulses, and supplying the integer number of pulses to the motor, and means for calculating a target pulse number And a correction means for correcting the correction value. 7. The image forming apparatus according to claim 6, further comprising: means for counting the number of pulses provided to the motor with the reference position of the conveying roller as a count starting point until the recording sheet is conveyed to the first row of personnel positions; And means for determining a target number of pulses at a real number of personnel positions of the current line in the first row by adding the pulse number correction value based on the actual pulse number correction value. The recording apparatus according to claim 6 or 7, wherein, when the target number of pulses of real number indicating the amount of conveyance of the recording material of the next row exceeds the number of real number pulses of one week (one revolution) of the conveying roller, The number of pulses of the real number of one week of the actual number of pulses of the actual number of pulses of the one week of the week Characterized in that it comprises: The recording apparatus according to claim 6 or 7, wherein, when the target number of pulses of real number indicating the amount of recording paper transported to the next destination exceeds the number of real number pulses of one week of the transporting roller, The number of pulses of the real number is subtracted from the number of pulses supplied to the motor and the number of pulses of the remaining number of real numbers is used to determine the division, And the number of pulses is calculated. The serial head type recording apparatus according to claim 8, wherein a reduction ratio is set to an integer ratio. The serial head type recording apparatus according to claim 9, wherein only a part of the reduction ratio is set to an integer ratio. A serial head type recording apparatus having a conveying roller for conveying a recording sheet, a motor rotating by a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a reduction ratio between a gear directly connected to at least the conveying roller and a gear engaged with the gear is set to an integer ratio, and based on the conveying unevenness of each compartment when the conveying roller is divided into a plurality of sections, The number of supply pulses at a current personnel position and the number of supply pulses at a present personnel position are set to be equal to the number of supply pulses at a current personnel position, By adding the correction value of the number of pulses of the section corresponding to the number of recording sheets Means for adding the target number of pulses to the target number of pulses of the current position and the actual number of pulses for the next line to obtain the number of pulses of the real number representing the amount of feeding of the recording material to be replaced, Means for acquiring a feed pulse number of a real number representing a feed amount of a recording sheet to a new destination by obtaining a correction value for the number of pulses for a new number of pulses, And means for integerizing the actual number of pulses of the preceding line and supplying it to the motor. The serial head type recording apparatus according to claim 1, A serial head type recording apparatus having a conveying roller for conveying a recording sheet, a motor rotating by a predetermined angle in accordance with the number of pulses, a gear group for transmitting the rotational force of the motor to the conveying roller, Wherein a reduction ratio between a gear directly connected to at least the conveying roller and a gear engaged with the gear is set to an integer ratio, and based on the conveying unevenness of each compartment when the conveying roller is divided into a plurality of sections, A holding means for holding a pulse number correction for the number of supply pulses provided for each section so as to reduce the conveyance unevenness; a holding means for holding the actual number of pulses at the current number of personnel positions, By adding the correction value of the number of pulses of the section corresponding to the predetermined number of times, Means for calculating a feed pulse number of a real number indicative of a feed amount of recording paper of a provisional next feed destination by adding to the feed pulse number of the feeding position of the feeder pulses; Means for calculating a target number of pulses of a next generation destination by adding the pulse number correction value of the segment corresponding to the number Means for calculating an error by subtracting the actual number of pulses for the next line from the actual number of pulses for the next line; A means for calculating the number of pulses, and means for integerizing the number of correction room number pulses and supplying the same to the motor. .