JPS609777A - Multicolor transfer-type thermal recorder - Google Patents

Abstract

PURPOSE:To correct a shift in a transferring position for each color ink and thereby enhance recording quality, by a method wherein a feed quantity of a recording paper is detected from a rotating angle of each back-up roller, and recording is performed by deleting or inserting a one-line amount of image information when the feed quantity is increased or decreased by a minimum feed quantity. CONSTITUTION:Based on the rotating angle of each of back-up rollers 11, 21, a pulse P1, P2 proportional to the feed quantity of the recording paper P is detected, and is counted by a counter C1, C2. On the other hand, each time a driving pulse P0 in a driving roller driving circuit reaches (n), the ratio between the driving pulse P0 and the rotating angle pulse P1, P2 is calculated by the first or second calculating circuit 40, 50. The third calculating circuit 60 detects whether or not there is a difference equivalent to the minimum feed quantity (one line) between the ratios thus calculated. For example, when the feed quantity of the recording paper in a red recording part 200 is longer than that in a black recording part 100 by a one-line amount, a one-line amount of red image information is deleted, whereby the feed quantity of the recording paper P in the red recording part 200 is equalized with that in the black recording part 100 in a pseudo manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transfer type thermal recording device, and more particularly to a color transfer thermal recording device comprising a line thermal head, an ink donor film corresponding to the line thermal head, and a back roller. The present invention relates to a multicolor transfer type thermal recording device that has recording sections for two or more colors, and each recording section independently transfers image information of the color, and records a multicolor original by combining the transferred image information of each color. .

[Prior art]

FIG. 1 is a schematic diagram conceptually showing an example of the configuration of a conventional multicolor transfer type thermal recording device. The device is a line thermal spatula)"10, a back roller ii.

Black ink donor film C (lower than black) 1)
2. A black transfer heat-sensitive placement unit 100 consisting of a F12 supply roller 13°, a take-up roller 14 and a drive roller 15, and a line thermal bed 20. A two-color transfer thermal recording device having a back roller 219 red ink donor film c (hereinafter referred to as F from red) 22 a red transfer thermal recording section 200 consisting of a supply roller 231 of the red ink donor film 22, a take-up roller 24, and a drive roller 25. It is. The line thermal heads 10 and 20 are connected to a pressure contact mechanism (not shown), and are brought into pressure contact with the back roller 11 and the back roller 21 through FI2 from black and 'F22' from red at the start of recording.

At the same time, F12 from the black color and F22 from the red color.
The transportation of the black IDFI 2 and red II) has also started.
722 is a line thermal head 10 of each recording section
and Baku crawler 11 questions and line thermal head 20
5x crawler 211Z'& winding rollers 14 and 2 from respective supply rollers 13 and 23 while being conveyed
4 are sequentially wound. On the other hand, the conveyance of the recording paper P is started from the recording paper supply mechanism that does not flow, and first the black recording section 1
F12. It is supplied between the back crawlers 12. Thereafter, the vaginal recording paper P is conveyed between the black IDF 12e and the back roller 11 in synchronization with and in close contact with the black IDF 12 that has been conveyed in advance as described above. At this time, the F12 ink is transferred onto the recording paper P from the black color which is melted at the required heat generation part of the thermal head 1o which is selectively driven according to the black image information of the predetermined document, and first only the black image information is recorded. will be carried out.

The recording paper P on which the black image information has been recorded is then transferred to the IP 22 and the back roller 21 from the red color of the red recording section 200.
Similarly to the black recording section 100, the red IDF 22 is conveyed in close contact with and in synchronization with the red IDF 22 which is being conveyed in between.

At this time, the molten ink of the red IDF 22 is transferred, which is melted at a required heat generation location of the thermal head 2o, which is selectively driven according to the red image information of the predetermined original.

Therefore, two-color image information is recorded on the recording paper P by a combination of the previously transferred black image information and the red image information, and then the paper is ejected to a paper ejection tray (not shown). In this way, a plurality of transfer heat-sensitive recording sections of different colors are arranged in series, and each recording section sequentially conveys the same recording paper while transferring different colors independently, and by combining these transfer inks. In a multicolor transfer type thermal recording device that records multicolor originals in blue, it is particularly important for K to prevent displacement of the transfer position of the molten ink in each recording section in order to maintain good recording quality. However, according to the above-mentioned conventional apparatus, the conveyance speed of the ink donor film of each recording section that participates in conveyance of the recording paper is affected by slight diameter differences and dirt conditions in the manufacturing process of each drive roller, or from each of the F supply rollers. This has the disadvantage that it easily changes due to differences in diameter or recording density, and as a result, the conveyance amount of the recording paper differs, resulting in misalignment of the transfer position of each color ink, which significantly impairs the recording quality.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and even when there is a difference in the amount of conveyance of the recording paper in each recording section due to the above-mentioned factors, it is possible to correct the transfer position deviation of each color ink, so that the transfer position can always be corrected. It is an object of the present invention to provide a multicolor transfer type thermal recording device that can obtain high quality recorded images.

[Structure of the invention]

Therefore, in the present invention, the back rollers of each of the recording sections are rotated as the recording paper is conveyed, and the load on the back rollers is small, and the back rollers are conveyed with little slippage with the recording paper, so that the conveyance distances of both of them are equal to each other. Focusing on this point, a means for detecting the rotation angle of each back roller is provided, and the conveyance amount of the recording paper in each of the recording sections is detected from the detection value of the detection means, and the conveyance amount of the recording paper in the recording section is set as a reference. When the conveyance amount is increased or decreased by one line, that is, the minimum feed amount of the recording paper, compared to the conveyance amount or the conveyance amount with other recording sections, one line of image information added to the line thermal head of the recording section is calculated. The recording is performed by deleting or inserting each of the inks, thereby correcting the transfer position shift of the melted ink of each color and improving the recording quality.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below based on the accompanying drawings. First, the multicolor transfer type thermal recording device of the present invention has, for example, the shafts of the back crawlers 11 and 21 of the black provision section 100 and the red provision section 200 of the conventional device shown in FIG. 1, as shown in FIG. 2(a). It is constructed by attaching back roller rotation angle detectors 31 and 32. A well-known incremental shaft encoder can be used as the back roller rotation angle detectors 31, 32.

This incremental shaft encoder is composed of a rotary plate 33 in which transparent parts and opaque parts are formed at a uniform pitch, and a light emitting element 34 and a light receiving element 36 that are arranged opposite to each other with the rotary plate 33 in between. Output Kj of the light-receiving element 36 when the light emitted from the light-emitting element 34 is received by the light-receiving element 36 via the rotary plate 33 and the slit plate 35 when rotating with the rotation of the back rollers 11 and 21 Second, a pulse train as shown in FIG. 3(b) is generated depending on the rotational state of the rotary plate 330.

Therefore, in the present invention, the number of pulses is counted, the rotation angle of each of the back rollers 11 and 21 is detected from the count value, and the rotation angle of each of the back rollers 11 and 21 is detected from the rotation angle.
The feed amount of the recording paper P that is conveyed in synchronization with 1 is calculated. By the way, the back roller rotation angle detectors 31 and 32 are
It must have a resolution capable of detecting the rotation angle of the back roller 11.degree. 21 to which *32 is attached, which corresponds to the minimum standard feed amount of 1242 minutes for the recording paper P. For example, when the diameter is 25 m (that is, the circumference of the back crawler is 25πm), the rotary plate 33 is such that it can detect θ-0,38' or less from the formula below.
Select. Therefore, at this time, the resolution of the pack roller rotation angle detector is 948 (-360'÷0.38'') [parf rotation] or more.

Further, FIG. 3 is a block diagram showing an example of the configuration of the control section of the apparatus of the present invention, and hereinafter, based on FIG. 3, the transfer position deviation correction control of the apparatus of the present invention will be described in detail. First, when the apparatus starts recording, the rotation of each of the back rollers 11 and 21 is started, and the back roller rotation angle detectors 31 and 32 attached to the respective shafts record the rotation angle of each of the back rollers 11 and 21. Pulses P1 and P, which are proportional to the feed amount of paper P, are detected, and each pulse P1 and P is counted by a respective counter C1.
and C8 and are counted respectively. These count values are then added to the first arithmetic circuit 40 and the second arithmetic circuit 50, respectively. Meanwhile, at the same time, the busy counter O0 counts the drive pulses Po applied to each drive roller 15 and 25 from a drive roller drive circuit (not shown), and sends the count value to the first arithmetic circuit 40 and the second arithmetic circuit 50 in the same manner as above. Add. Here, the count value of the counter C0 is a predetermined constant value nK
When the first arithmetic circuit 40 and the second arithmetic circuit 5 reach
0, the ratio between the drive roller drive pulse po counted up to this time and the rotation angle pulses P1 and P of each back roller 11 and 21 is calculated. Such an operation is performed every time the count Po of drive roller drive pulses in the counter C0 reaches nK, and each time the first arithmetic circuit 40 and the second arithmetic circuit 50 calculate the drive roller drive pulse P0 and each of the back rollers. The ratio of the rotation angle pulses P1 and P, that is, the respective feed amounts of the recording paper P transported in synchronization with the respective back rollers in the recording section is calculated.

Next, the recording paper feed amount in each recording section is determined by the third
It is applied to the arithmetic circuit 60, and it is detected whether or not there is a difference between these values by an amount corresponding to the minimum feed distance l lines of the recording paper P. Here, for example, when the recording paper feeding amount of the black recording section 100, that is, the detection value of the first arithmetic circuit 40 is used as a reference, the detection value of the second arithmetic circuit 50, that is, the recording paper feeding amount of the red recording section 200 is the black recording When it is detected that the minimum feed amount of the recording paper is 1247 times longer than the feed amount of the section 100, the third arithmetic circuit 60 outputs the thermal head drive circuit 70 and the motor drive circuit 80 of the red recording section.
A control signal based on the detection result, that is, a red image information deletion signal is sent out. Upon receiving this, the motor drive circuit 80 rotates the step motor 81 to start conveying the recording paper, and the thermal head drive circuit 70 receives the red image information deletion signal from the red recording section line thermal head 200. By deleting one line of red image information to be recorded in the area and not printing, the feed amount of the recording paper P in the red recording section is made to match the feed amount in the black recording section.

By the way, regarding the printing result at this time, since the minimum image information of the document normally used is the recording paper minimum feed distance of 2 lines or more, as described above, the image information 124 is
Even if 7 minutes is deleted, the image information will not disappear. Further, contrary to the above, the detected value by the third arithmetic circuit 60 indicates that the feeding amount of the recording paper P in the red recording section 200 is higher than that in the black recording section 100.
If the value is one line shorter than the feed amount of 0, a red image information insertion signal is sent from the third arithmetic circuit 60 to the thermal head drive circuit 70 and motor drive circuit 80. As a result, the step motor 81 is rotated by the control pulse from the motor drive circuit 80 to start conveying the recording paper, and the thermal head drive circuit 70 starts moving the line thermal head 2 of the red recording section.
By inserting and printing one line of red image information at 0, the feed amount of the recording paper P in the red recording section is made to match the feed amount of the black recording section 100, as described above. Insert here 1
The image information for the line is the image information recorded immediately before or the image information to be printed next.

By performing the above control continuously during recording, the transfer position of the molten ink by each of the line thermal heads 10 and 20 due to the difference in the feeding amount of the recording paper P in each of the black and red recording sections 100 and 200 can be adjusted. Misalignment can be reduced. In the above embodiment, when the feed amount of the red recording section 200 increases or decreases by one line with respect to the feeding amount of the recording paper P of the black recording section 100, the red image information of the line thermal head 20 of the red recording section is changed to 1.
Although the example of printing by deleting or inserting a line has been described, it is also possible to perform similar control on the line thermal head 10 of the black recording section based on the feed amount of the red recording section 200. In addition, a reference feed amount is set in advance in addition to the above, and when the feed amount of each recording section increases or decreases by one line with respect to the reference feed amount, one line of image information of the line thermal head of the recording section is updated. The same effect as described above can be obtained by controlling to reduce or insert each. Further, although the above configuration has been described as an example of a two-color recording device, it is of course applicable to a multi-color recording device.

〔Effect of the invention〕

As explained above, according to the multicolor transfer type thermal recording device of the present invention, the recording paper feed amount of each recording section is detected from the rotation angle of the back roller of each recording section, and the respective feed amount is determined by the rotation angle of the back roller of each recording section. When the minimum feed amount increases or decreases by the minimum feed amount of 1247, one line of image information of the recording color is deleted or inserted from the line thermal head of the recording section and printed, so there is a difference in the feeding amount of the recording paper in each of the recording sections. This has an excellent effect in that it can reduce the transfer position deviation of the line thermal head and significantly improve the recording quality.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram of a two-color transfer type thermal sensitive device showing a conventional example.
FIG. 3 is a block diagram showing an example of the configuration of the control circuit section in the apparatus of the present invention. 10.20...Line thermal head, 11゜21・
...Pack roller, 12...Black ink donor film, 22...Red ink toner film, 31.32
... Back roller rotation angle detector, 40... First arithmetic circuit, 50... Second arithmetic circuit, 60... Third arithmetic circuit, 70... Thermal head drive circuit (15)

Claims (1)

[Claims] Ordinary recording paper and an ink donor film coated with heat-melting or heat-sublimable ink are superimposed, and a back roller is used to press them against a line thermal head, and image information is transferred from the line thermal head. In a multi-color transfer type thermal recording apparatus, which is provided with recording sections for at least two colors that melt ink and perform color transfer recording on the recording paper using thermal energy selectively supplied according to a means for detecting the rotation angle of the recording sheet; and a reference feeding amount or a predetermined feeding amount for calculating the feeding amount of the recording sheet conveyed through the recording section from the detection value of the detecting means. If the feed amount is greater than the minimum feed amount of the recording paper compared to the feed amount based on 1 of each recording section, the next image information 1 of the line thermal head of the recording section is
247 minutes, and when the amount of recording paper is decreased by the minimum feed amount of the recording paper, the recording paper is characterized by comprising a control means for displaying the previous image information or the next image information of the line thermal head of the recording section. A multicolor transfer type thermal recording device.