JPH02286375A - Thermal transfer recorder - Google Patents

Abstract

PURPOSE:To prevent the generation of creases by a method wherein an ink sheet is sent to a printing unit under a condition that the sheet is provided with a tension and printing is effected while the sheet is cut after printing so as to be separated into a plurality of parts in the widthwise direction of the same and, then, the separated parts are reeled around an ink sheet reeling roll differently respectively. CONSTITUTION:An ink sheet 8, fed by a feed roll 7, is provided with a tension by two sets of tension rollers 9, 10 and is reeled around a reeling roll 11 through a passage between a recording head 6 and a platen drum 1. A cutting device 12 for cutting the ink sheet 8 or a cutting roller, for example, is provided at a position after the ink sheet 8 passed a printing position effected by a recording head 6. The ink sheet 8 is moved together with the platen drum 1 and when the sheet 8 is separated from the position of printing effected by the recording head 6, the sheet 8 is guided to a cutting device 12 and is separated by cutting by an edge 18 into desired widths. A plurality of separated belt type ink sheet pieces is reeled around the collars 15 of the reeling roll 11 separately respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal transfer recording device, and more particularly to an ink sheet feeding device for a thermal transfer recording device.

[Prior art]

A platen drum that wraps the recording paper, an ink sheet,
2. Description of the Related Art Devices that have a recording head and perform thermal transfer recording by pressing the recording head against a sheet of paper via an ink sheet are widely known.

In conventional thermal transfer recording devices, before the ink sheet enters the printing position by the recording head, tension is applied in the width direction by a guide roll and a pair of tension rolls, which prevents waving of the ink sheet and the ink sheet at the printing position. For example, Japanese Patent Application Laid-Open No. 57-116662 describes how to prevent wrinkles from forming.
It is known from the publication No.

In this conventional device, tension is applied to the ink sheet before it reaches the printing position by the recording head, so it is possible to prevent wrinkles from forming up to the printing position, but it is not possible to prevent wrinkles from forming after printing. .

If the printing pattern recorded on the paper is extreme, for example, the fourth
As shown in the figure, when the density difference between the printing area 52 and the non-printing area 51 is large, the ink sheet after printing has no ink in the area 52' corresponding to the printing area 52, and the non-printing area 51 has no ink. The corresponding portion 51' remains as it was at the beginning and has ink attached to it.

Therefore, when winding up with a take-up roll, the portion 52' corresponding to the imprint area is easily stretched due to tension and the amount of elongation is large, and the area corresponding to the non-imprint area 51 is difficult to elongate.
When it is wound up in this state, as shown in FIG.
As shown in the left half of the figure, wrinkles occur at the boundary between the paper sheet and the non-stamp section 51'. Before wrinkles occur, the ink sheet is smooth and wrinkle-free, as shown in the right half of Figure 5 and Figure 6A, but when wrinkles occur, the ink sheet surface becomes finely wavy, as shown in Figure 6B. wrinkles occur. Even if wrinkles occur at a position after printing, if wrinkles occur on the ink sheet, the wrinkles may extend to the printing position and cause uneven printing. Wrinkles on the ink sheet that occur due to differences in elongation depending on the area,
This cannot be prevented even if tension is applied to the ink sheet in the width direction as in the conventional apparatus described above.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a thermal transfer recording device that does not cause wrinkles on an ink sheet.

[Means to solve the problem]

The present invention solves the above problem by having a platen drum for winding and holding recording paper, an ink sheet, and a recording head.
In a thermal transfer recording device that prints by energizing each element of the recording head to generate heat while the ink sheet is in pressure contact with the paper by the recording head, the ink sheet is sent out from the ink sheet supply roll and wound around the ink sheet take-up roll. Tension is applied by a tensile roller at a position before reaching the printing position by the recording head, and a plurality of rollers are arranged at intervals in the width direction of the ink sheet in the vicinity of the recording head after passing the printing position. The present invention has been solved by a thermal transfer recording apparatus characterized in that the ink sheet is cut into a plurality of pieces by a cutting device having a blade, and each piece is individually wound around the ink sheet winding roll.

[Effect]

According to the present invention, the ink sheet reaches the printing section under tension, the recording head prints on the paper, and after printing, the ink sheet is cut in the width direction by a plurality of blades of the cutting device. The ink sheet is cut into a plurality of parts, and each of the separated ink sheets is individually wound onto an ink sheet winding roll.

According to the present invention, the ink sheet could be wound up without wrinkles occurring due to the difference in elongation between the printed portion and the non-printed portion.

〔Example〕

The details of the present invention will be explained based on embodiments shown in the drawings.

In FIG. 1, a platen drum l has a presser claw 2,
The platen drum l is fed from the paper feed cassette 3 by the paper feed roller 4.
The leading edge of the paper 5 is clamped by the presser claw 2 at the position shown in FIG. It is wrapped around the circumferential surface of the drum 1.

A recording pad 6 is provided above the platen drum 1 so as to be able to press against and separate from the platen drum 1.

The ink sheet 8 sent out from the supply roll 7 is given tension by two tensile rollers 9 and 1O, passes between the recording head 6 and the platen drum 1, and is then taken up by the take-up roll 1.
1. A cutting device 12, such as a cutting roller, for cutting the ink sheet 8 is provided at a position after the ink sheet 8 has passed the printing position by the recording head 6.

The cutting device Y112 has a plurality of blades arranged at predetermined intervals in the width direction of the ink sheet 8, as shown in FIG.
The ink sheet 8 is cut and separated into a plurality of pieces in the width direction by a blade 18. In the example shown in FIG. Any kind of knife can be used as long as it can separate and cut.

The take-up roll 11 is attached to the cutter 1 as shown in FIGS. 2 and 3.
A plurality of flanges 1 arranged at intervals corresponding to the intervals of 8.
It has 4. The S twin roll 11 has a winding core 17, and collars 15 each having a length corresponding to the cutting and separation width of the ink sheet 8 are attached to the winding core 17 via spring clutches 16. 15 are separated from each other by flanges 14 and are independently rotatable around the winding core 17. The flanges 14 can all be fixed to the winding core 17 or to the collar 15.

As shown in FIG. 1, the platen drum 1 is stopped with the presser claw 2 located at the bottom, and the presser claw 2 is open. The leading edge of the recording paper sent out from the paper cassette J is held by the presser claw 2.
The platen drum 1 then rotates in the direction of the arrow, and the presser claw 2 closes and holds the presser claw 2.
Stop when you pass. The recording head 6 is pressed against the platen drum 1 via an ink sheet and recording paper, and printing by the recording head is performed while the platen drum 1 rotates. At this time, the ink sheet 8 also moves together with the platen drum 1.

The ink sheet 8 moves together with the platen drum 1, and when it leaves the printing position by the recording drum 6, it is guided to the cutting device 12, where it is cut and separated into desired widths by the blade 18 into a plurality of strip-shaped ink sheets separated by 0. The pieces are each individually wound onto a collar 15 of a winding roll 11.

When the printing of the entire surface of the recording paper is completed, the recording head 6 leaves the platen drum 1, and in the case of a one-color image, the recording paper is discharged to the discharge tray 13. In the case of a full-color image, the presser claw 2 operates again to clamp the recording paper again, and the recording head 6
It rotates in the same manner as above until it passes, and then stops. At this time, the ink sheet 8 is wound up until the next color portion comes to the printing position.

Then, the recording drum 6 is again pressed against the platen drum 1.

When printing of a plurality of colors corresponding to the necessary separation colors is completed by the above-mentioned turning process, the paper is ejected.

When the ink sheet 8 leaves the printing position by the recording pad 6, it is wound onto a take-up roll 11 while being pressed against a cutting roller 12. At that time, the cutting roller 12
The ink sheet 8 cut and separated by the flange 14
They are wound up in a state where they are separated from each other, and each part is wound up with tension being applied to each part independently.

Each collar 15 of the take-up roll 11 is connected to a spring clutch 1
6, the spring clutch 16 rotates together with the winding core 17, and idles when a tension equal to or higher than the set pressure is applied.

The take-up core 17 rotates faster than the printing speed of the recording head 6, that is, faster than the platen drum 1, and the collar 15 is rotated via a spring clutch 16, so it slides against the take-up core 17 while rotating the ink sheet. Wind it up while always applying tension to 8.

〔effect〕

According to the present invention, after printing, the ink sheet is cut into a plurality of pieces in the width direction, and each of the cut and separated strip-shaped ink sheets is individually wound around the collar of the take-up roll, so that the printed part and the non-printed part are Even if a difference in elongation occurs in the ink sheet, it is possible to wind it up without causing wrinkles. Since the ink sheet is cut and separated, it is possible to prevent the contents of one page of the ink sheet from being read as they are, which is preferable in terms of security protection.

[Brief explanation of drawings]

FIG. 1 shows the overall structure of a thermal transfer recording device according to the present invention.
Presser claw 5...Paper 6...Recording head 7...Ink sheet supply roll 8...Ink sheet 9.10...Tension run roller 11...Ink sheet take-up roll 12...Cutting Device 14...Flange 18...Blade 1

Claims (1)

[Scope of Claims] It has a platen drum that wraps and holds recording paper, an ink sheet, and a recording head, and each element of the recording head is energized to generate heat while the ink sheet is in pressure contact with the paper by the recording head. In a thermal transfer recording device for printing, an ink sheet fed from an ink sheet supply roll and wound around an ink sheet take-up roll is given tension by a tension roller at a position before reaching a printing position by the recording head. After passing the printing position, the ink sheet is cut into a plurality of pieces by a cutting device having a plurality of blades arranged at intervals in the width direction of the ink sheet in the vicinity of the recording head, and the ink sheet is cut into a plurality of pieces by the ink sheet winding roll. A thermal transfer recording device characterized in that each is individually wound.