JPS6044373A - Multicolor transfer-type thermal recorder - Google Patents

Abstract

PURPOSE:To prevent color-drift of colors from being generated at recording parts, by a method wherein a belt form medium for feeding a recording paper between a back-up roll and an ink doner sheet by a frictional force is provided intermediately at each recording part. CONSTITUTION:When the paper 9 is brought onto a thermal head 1a of the first recording part M along a paper-supplying guide 11, the paper 9 is fed as one body with a belt 7 by the frictional force between it and the belt 7. A magenta ink doner sheet 5a is also fed by a frictional force between it and the paper 9, and images are recorded in magenta on the paper 9 by picture signals fed from the thermal head 1a. Then, the paper 9 is clamped between the ink doner sheet 5a and the belt 7 and between a yellow ink doner sheet 5b and the belt 7, and is fed onto a thermal head 1b of the second recording part Y, where images are recorded in yellow on the paper 9. Similarly, recording in cyan is conducted at the third recording part C, and recording in black is conducted at the fourth recording part B.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a transfer type thermal recording device that performs multicolor recording, and more specifically, to a single-pass type transfer type thermal recording device that does not cause color shift in images. be.

Conventional technology: In the transfer type thermal recording method, an ink donor sheet with heat-melting ink coated on one side of a base paper is used as a recording medium, and heat corresponding to image information is selectively supplied from a thermal head to this ink donor sort. An image is recorded by transferring the melted ink onto paper from this heat. If you prepare multiple sheets coated with ink of different colors as ink donor sheets and perform thermal transfer recording on one sheet of paper sequentially by sorting these ink donors, this transfer type thermal recording method can print a large number of sheets. Color recordings can be obtained.

There are two types of devices that perform such multi-color recording: multi-pass type and single-pass type.

A multi-pass multicolor transfer thermal recording device is equipped with one recording section, and performs recording by repeating the operation of feeding one sheet of paper and multiple ink donor sheets to this recording section for each color. However, there is a problem that the operation is complicated.

On the other hand, a single-pass type multicolor transfer thermal recording device has a plurality of recording sections, and is capable of performing multicolor recording by feeding the sheet once.

An example of a conventional single-pass multicolor transfer recording apparatus is shown in FIG.

This device consists of four sets of recording sections: a first recording section M1 that records in magenta; a second recording section M1 that records yellow; a third recording section C that records 71777 colors; and a third recording section C that records black. It is equipped with a fourth recording section B that records the paper ζ fed on the conveyance path from the paper supply tray 17 or 18 (17 and 18 store paper of different sizes).
Multicolor recording is performed by supplying corresponding image signals to each recording section. In each recording section, for example, referring to the first recording section, there is an ink donor sheet 5a in which magenta ink is applied to a base paper.

A first supplying the magenta ink donor sheet 5a.
a supply roll 3a of Take-up roll 4a
The first recording section is configured by: In this apparatus, the paper is conveyed by the action of the drive roll 6a of the ink donor sheet in a state where it is folded onto the ink donor sheet, and magenta color recording is performed. For recording after the second yellow color, an image signal delayed by a preset time according to the paper running speed and the distance from the first recording section is supplied, and the images are combined in each recording section. will be done.

However, in this device, the paper is driven by independent drive rollers 6a, 6b, 6c, and 6d in each recording section, so it is affected by subtle differences in the diameter, friction coefficient, etc. of these drive rolls. Therefore, the amount of conveyance of the paper tends to vary (therefore, there is a disadvantage that the quality of the recorded image deteriorates due to misalignment of colors due to the arrangement).

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a single-pass type transfer type P that can obtain high-quality multicolor images without causing color deviations in the recording in each recording section. The purpose is to provide a recording device.

Structure of the Invention In the apparatus of the present invention, a sheet of paper is brought into close contact with a belt-like medium that does not expand or contract, and the sheet is conveyed by the frictional force between the sheet and the belt-like medium.

The configuration of an example of the device of the present invention is shown in Fig. 2 (overall view) and Fig. 3 (
Enlarged view of the recording section) [This is shown. That is, in the apparatus of the present invention, each recording FjBM, Y, C, B ; (-
, the back rolls 2a, 2b, 2c, and 2d are arranged in equal proportions from the center on the circumference of +';l[, and placed between the bank roll and the ink donor sheet. A belt-like medium with little expansion and contraction (appropriate coefficient of friction) is used;
gj% The driving roller 10 and the pinch roller 13 press and sandwich each other, and the driving roller lO is connected to the motor pulley 15 through the timing belt 14i, and the driving force of the motor 16 is transmitted to the motor pulley 15, the timing belt 14, and the driving roller 10. , this roller 10 and the pinch roller 13
A belt-shaped medium sandwiched between rotates at a predetermined speed,
At the same time, the ink donor sheet 5a of each color is
, sb, 5c, 5ds and the fed paper run at the same speed.

The belt-like medium used in the apparatus of the present invention may be made of any material that has a suitable coefficient of friction such that it does not expand or contract and does not cause slippage between the recording paper and the ink donor sheet.

As such a material, for example, a rubber material is used, and it is effective to insert glass fiber cord cores in parallel in the running direction of the IDf belt as a reinforcing material in the center of the rubber in the thickness direction, or in a mesh pattern. It is.

In the apparatus of the present invention, the paper 9 is moved along the paper feed guide 11,
First, when the length of the first recording section M reaches ζ above the round head la, the belt 7 moves due to the rotation of the motor 16, and the paper 9 is conveyed together with the belt due to the frictional force with the belt 7. The ink donor sheet 5a is also conveyed by the frictional force with the paper 9, and magenta color is recorded for 91 times in response to the image signal from the -V--maru head 1a.

Next (the paper 9 is conveyed to the thermal of the second recording section Y over y and lb while being sandwiched between the magenta color ink donor sheet 5a, the yellow color ink donor sheet 5b, and the belt, and the yellow color is In the same way, cyan color is recorded in the third recording section C and black color is recorded in the fourth recording section B to create a multicolor record on the paper.
The paper is ejected along the direction, and a multicolor record is obtained.

As described above, in the apparatus of the present invention, the belt-like medium 7 is moved at a constant speed by the motor 16, and the paper 9 and each ink donor sheet are run at the same speed as the belt-like medium 7, so that color misregistration is avoided when recording each color. will not occur.

In addition, in the above-mentioned apparatus, in the recording section where recording is not being performed, the thermal head is released from the pressure on the roller to stop the conveyance of the ink donor film, thereby saving the ink donor film.

Although the present invention has been described above with respect to a single-pass type multicolor transfer type thermal recording device having four sets of recording sections, the present invention can be applied to an arbitrary number of recording sections.
It will be obvious to those skilled in the art that the arrangement order of the recording sections is not limited to the above example and can be arbitrarily arranged.

Effects of the Invention As described above, the present invention provides a single-pass type multicolor transfer thermal recording device in which recording paper is conveyed through a common belt-like medium in each recording section. Therefore, multicolor copies without color shift can be obtained using a device with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of a conventional single-pass type multicolor transfer type thermal recording device, FIG. 2 is a schematic diagram of an example of a multicolor transfer type thermal recording device of the present invention, and FIG. 3 is a schematic diagram of an example of the multicolor transfer type thermal recording device of the present invention. FIG. 3 is an enlarged view of the recording section of FIG. Codes in the figure: M, Y, C, B--recording section; 1, la, ib,
lc, ld - thermal head; 2.2a, 2b
, 2c, 2d - back roll; 3a13b13c
13d... Ink donor note supply roll: 4a,
4b, 4c, 4d... Ink donor note winding roll: 5.5a, 5b, 5c, 5d'' Ink donor note; 6a, 6b, 6c, 6d, 10-driving roll; 7... Belt-shaped medium : 8... roll; 9...
・Paper; 11... Paper feed guide; 12... Paper ejection guide; 13... Pinch roll: 14... Timing belt; 15... Pulley: 16... Motor: 17.1
8...Paper supply tray. Figure 1 '1d if2 diagram

Claims (1)

[Claims] It is equipped with a plurality of recording units each consisting of a thermal head, an ink donor sheet, and a back roll that presses the ink donor sheet against the thermal head, and each belt-like medium that conveys the recording paper by frictional force between the back roll and the ink donor sheet. A multicolor transfer type recording device that is interposed astride a recording section.