JPS58160176A - Driving device for donor sheet and paper sheet in multicolor thermal printer - Google Patents

Abstract

PURPOSE:To obtain the titled device enabling the excellent meintenance of the registration of each color of an image reproduced on a recording paper sheet, by a method wherein rolls related to running of the paper sheet on a thermal recording head are driven by a single diving source. CONSTITUTION:Donor sheet take-up rolls 28 and 29 and a paper sheet take-out roll couple 30 are driven unitarily by a single step motor 32 by using chains or belts with teeth or the like. It is preferable that the step motor 32 is arranged so that the center of the driving shaft thereof is positioned at an equal distance to the centers of the shafts of the rolls 28 and 29 and at a larger distance to the center of the shaft of the driving roll of the roll couple 30 than that to the roll 29.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a donor sheet and paper drive device in a transfer multicolor thermal one-linter, and to an improvement of the drive IJ system in 4#.

An example of a conventional transfer multicolor thermal printer is shown in Fig. 511. In the figure, 1 is a recording paper, 2# and 8 are 1st # and Is2 thermal recording heads, respectively, and 6 and 9 are pack rolls, respectively.

In addition, 5 and 1a are supply rolls of donor sheets 4 and 1a of 41 colors and 412 colors, respectively, and 6 and 1★ are windings of donor sheets 4 and 10 of one color and a second color, respectively. Rolls 7 and 11 are drive rolls 12 for paper 1
15.15A is a pair of ejecting rolls for paper 1, and 15.15A is a drive motor.

- When creating, insert paper 1 into its insertion slot (not shown).
Sent from 11? , I11 Thermal recording head 2 and No. (Tsukroll S) are passed through the interleave. At this time, the donor sheet 4 coated with wax containing a heat-sublimable dye is run in close contact with the paper 1, and the recording head 2 r applied to
The dye Ill is thermally transferred onto the paper 1 in accordance with the image signal Ii.

In this case, the donor sheet 4 needs to run with zero relative misalignment with the paper 1 at least in the vicinity of the recording head 2. , it must be configured so that it passes between the recording head 2 and the back roll ink that is in pressure contact with it and is wound onto the donor winding roll 6 without bending.

In Figure 1, paper 1 that has finished recording in the first color is
After passing through the back roll 6 and the paper drive roll 7, the paper is sent to the second thermal recording head 8 and the back roll 9 which is in pressure contact with the second thermal recording head 8 in order to perform recording in the second color.

Then, in the same way as described above, the 1IlI diary 1 is brought into close contact with the donor sheet 10 coated with wax containing the second color dye, and a #12 color # image is recorded by thermal transfer.

Thereafter, the paper 1 is transferred to the second paper drive roll 11
And the paper is discharged to the outside of the machine by the paper discharge roll 51'1j12.

A two-color thermal recording is obtained through the above steps. Recording in four or more colors can also be performed by repeating the same process.

As is clear from FIG. 1, in the conventional transfer multicolor thermal printer, the conveyance system for paper and donor sheets is quite complicated.

For this reason, it has conventionally been common practice for each color recording section to have a step motor or the like, and to be driven by an independent drive source.

Even with such a configuration, if each step motor is driven by a driving power source with the same number of peripheral fluids and the same phase, theoretically, color misregistration should not occur.

However, in reality, with conventional apparatuses, it is difficult to ensure the registration and storage of recorded images, which often results in color misregistration.

The reasons for this are variations in tta due to manufacturing tolerance and wear of the drive shaft involved in paper running on the recording head, sharpening of the chain in the drive system, looseness between the Sugerocket and the chain, and fluctuations between the motors. It is thought that this is due to the mechanical dimensional error caused by the actual stacking.

The present invention has been made in order to eliminate the defects of the conventional transfer-based multicolor thermal glinter as described above, and is aimed at at least the IK excitation of the recording paper running K on the thermal recording head. , a single driving source (e.g. step motor)
The purpose is to provide a thermal printer with a transfer layer that is more flexible than the conventional printer.

Hereinafter, the present invention will be explained in detail using 1 and #AEm' showing an example.

FIG. 2 is a configuration diagram showing an embodiment of a transfer 112-color 1-thermal printer according to the present invention.

In the figure, reference numeral 16 denotes a pile of sheets cut to a predetermined size, which are stored in the sheet stacking platform 7.

A paper feed roll 18 is provided at the bottom IIK of the paper stacking table 17, and a registration date roll 19. j111 thermal recording head 20
．． Second recording head 21. And pack rolls 22 and 2 ink are placed in pressure contact with these, respectively.

*A pair of paper ejection rolls 60 is provided at 10,000 points of the screw feed path.1. As a result, the sheets that have been recorded are deposited on the catch tray 51 provided in the previous pair of discharge rolls 60.

On the other hand, the thermal recording heads 20 and 21 of M1 and [2]
Below are supply rolls 26 and 27 . of donor sheets 24 and 25 coated with dye-containing waxes of colors 1 and M2, respectively. II! The take-up rolls 2B and 29 are then arranged.

The first and #I2 donor sheets 24 and 25 are passed between the both distribution heads 20 and 21 and the cocoon weight pack rolls 22 and 25.

Both the donor sheet take-up rolls 28 and 29 and the paper ejection roll are then operated in a single step Tanabata 62.
driven by.

The transfer layer thermal printer configured in 5 above operates as described above.

First, the paper in the Fth layer of the stack 16 is sent out by the paper delivery roll 18 at a predetermined tiling. In addition, by using IIl registration storage ■ roll pair 19, it is possible to accurately match the transmission timing of the single signal.
The paper is fed between the first recursive recording head 20 and the back crawler 220.

When the paper passes through the jump between the m1 first thermal recording head 20 and the nozzle roll 22, the paper passes through the first donor sheet 2.
The first donor sheet 24 is conveyed in close contact with the first donor sheet 24 in response to the li image signal applied to the first recording head 20.
The first color dye is transferred and recorded.

The paper that has finished recording with the first color is Il! KIIIJ
The connection Vci between the second thermal recording head 21 and the back roll 26 is inserted. Then, as above, add the second
After color recording is completed, the paper is ejected into the catch tray 61 by a pair of advance paper ejection rolls 50.

In this embodiment, the two sets of donor sheet winding rolls 28
．． 29 and a pair of paper discharge rolls 50 are integrally driven by a single step motor 32 using a chain or a toothed belt.

In this case, the step motor 62 is
The axis distances from the axis centers of the donor take-up rolls 28 and 29 are the same, and the paper ejection roll pair 5
11 such that the distance bs from the riot roll axis of 0 is greater than that from the donor sheet take-up roll axis;
It is preferable to leave it at 1.

Furthermore, even if the paper feed roll 18 and registration storage roll pair 19 are driven by separate power sources, they have no effect on color misregistration in the multicolor thermal printer.

If the paper and donor sheet drive system of the multicolor thermal printer according to the present invention is applied to a machine that uses roll vapor as recording paper, it will be even more effective.

FIG. 43 shows an example thereof, and the same reference numerals as in FIG. 2 indicate the same constituent g elements.

In this figure, 61 indicates a roll vapor as a small recording paper, 65 indicates a pair of paper drive rolls, and !4 indicates a paper cutter.

When using roll paper as the paper, it is inevitable that there is no registration storage and roll, and a pair of drive rolls 55 and a cutter 64 of the roll vapor are required.

In this embodiment, in order to prevent one color shift, the donor sheet IIk take-up rolls 28 and 29. ! HiK
flJ? The drive roll pair 55 of the roll vapor may be driven by a single step motor 32.

Also, in this case, in order to prevent color shift or image tailing caused by local deflection of the paper or donor sheet even after long-term operation, the above-mentioned roll with the most paper iron overload is Vapor drive roll pair 65 drive shaft and JI
II step motor I! 12 It is effective to allocate the distance from the drive shaft so that it is smaller than the others.

Since the present invention is configured as described above, in the transfer type multicolor thermal printer, #I is reproduced on the recording soft soil.
It is effective in keeping the register storage condition of each color in good condition.

In addition, in the above-mentioned embodiment, for simplicity of explanation, 2
Although only a case in which the heat-sensitive recording heads are arranged in the shape of Ii[iI is shown in the color record, it is obvious that the present invention is not limited to this.

[Brief explanation of drawings]

Figure 41 is a schematic side view showing the configuration of a conventional multicolor heat-sensitive glitter, #! FIG. 2 is a schematic side view showing one embodiment of the multicolor thermal printer of the present invention, and FIG. 3 is a schematic side view showing another embodiment of the present invention. 2.8, 20.21...thermal recording head, 4,1
0°24, 25... Donor sheet, 28, 29
...Donor sheet end roll, sO...Paper discharge roll pair, 32...Stella 1 mop, as...
roll paper tribe roll vs

Claims (1)

[Claims] 0) In a multicolor thermal glinter having a plurality of thermal recording heads along the paper retraction path, at least a roll involved in running the paper over the four thermal recording heads, an 11tI recording edge head and a pack roll together with the paper. 1liii is applied to the alignment head during that time.
Il! In response to a signal 9, a single motor is used as a drive source for a take-up roll of a donor sheet coated with dye-containing wax to be thermally transferred onto the paper, thereby causing the paper to run over the thermal recording head. A drive device for donor sheets and paper in a multicolor thermal printer, characterized in that it prevents color shifts in the recording due to mechanical variations of the rolls involved and their drive SBGs.