JPH04140172A - Thermal transfer recording apparatus - Google Patents

Abstract

PURPOSE:To make the back tension due to a recording paper supply roll and the tension due to a transfer paper taking-up roll constant and to make the feed quantity of recording paper accurate by rotationally driving the recording paper supply roll and the transfer paper taking-up roll so as to bring both rolls into contact with the outer peripheries of a recording paper roll and a transfer paper roll. CONSTITUTION:The rotational driving of a supply roll 2 is performed by a drive source through the feed roller 16 being in contact with the outer periphery of the roll of the recording paper 1 wound around the supply roll 2 so that the feed quantity of the recording paper 1 is not affected by the outer diameter of the supply roll 2. In the case of transfer paper 6, the taking-up and rotational driving of the transfer paper taking-up roll 8 is performed by the drive source through the feed roller 17 being in contact with the outer periphery of the transfer paper taking-up roll to always obtain constant feed quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal transfer recording device that prevents misregistration between colors.

[Conventional technology]

In the conventional thermal transfer recording apparatus, as shown in FIG. 3, the recording paper 1 is transferred from the supply roll 2, over the platen 3, and onto the capstan 4 with the thermal head 9 located at the position indicated by the dotted line and separated from the platen 3. The transfer paper 6 is clamped by a pinch roller 5 and sent from a transfer paper supply roll 7 to a transfer paper take-up roll 8 via a guide roller 15, a platen 3, and a peeling guide roller 14.

In response to a recording start signal (not shown), the recording paper 1 is conveyed in the direction of the arrow to a paper edge sensor (not shown), and the transfer paper 6 is conveyed to a position where it is detected by a color-specific sensor (not shown). Next, the thermal head 9 descends to the position shown by the solid line on the platen 3, and a voltage is applied to the dots (not shown) necessary for recording on the thermal head 9, and the Joule heat generated by the current causes the transfer. One line of the image to be transferred from the paper 6 to the recording paper 1 is transferred. When the transfer of one line is completed, the recording paper 1 is transferred based on the capstan regulation.
While maintaining a constant tension by the hack tension of the platen 3 and the supply roll 2, the sheet is conveyed one line in the direction of the arrow by the conveying force of the capstan 4.

On the other hand, the transfer paper 6 is transferred by an amount corresponding to the conveyance of the recording paper 1.
The transfer paper is separated from the recording paper 1 through a peeling guide roller 14 and wound onto a transfer paper take-up roll 8 . In this way, when one color of one image, for example, yellow (Y), is completed, the thermal head 9 moves up as shown by the dotted line, and the transfer paper 6
The transfer paper take-up roll 8 removes the intercolor non-coating area (
(not shown) is wound onto the platen 3 overlapping the recording paper 1, and the recording paper 1 is wound up by the supply roll 2 while being regulated by the capstan 4. When the recording paper 1 reaches the recording start position (not shown), the transfer paper 6 is again wound up by the transfer paper winding roll 8, and the transfer paper 6 for one image of the next color to be transferred is rolled onto the recording paper 1. It is placed in a position that overlaps with

The thermal head 9 descends and prints the transfer paper 6 and recording paper 1.
are pressed onto the platen 3 in an overlapping state, and transfer recording is again performed line by line. In this way, yellow (Y), magenta (M), and cyan (C) are recorded and overlapped in the order of color to complete an image.

Here, the supply roll 2 of the recording paper 1 is driven by the motor 10 with the transmission gear 11 meshing with the second gear-shaped side plate (not shown) of the supply roll, and the transfer paper take-up roll 8 of the transfer paper 6 is driven. is driven by a gear-shaped side plate (not shown) of the transfer paper winding roll 8 via a motor 12 and a gear 13.
It is being carried out in

[Problem to be solved by the invention]

Therefore, in the above device, although the amount of reciprocating conveyance of the recording paper 1 is regulated by the capstan 4, the tensile force of the recording paper 1 against the capstan of the supply roll 2 changes depending on the diameter of the 10 rolls of the recording paper on the supply roll 2. , has a significant influence on the conveyance amount of the capstan 4. Also, transfer paper 6
The winding force also changes depending on the winding diameter of the transfer paper 6 on the transfer paper winding roll 8.
Since the transfer paper 6 is thermally transferred and conveyed line by line to the de-J separation guide roller 14, even if the conveyance amount is regulated by the capstan 4, this effect cannot be avoided.

As described above, the conveyance amount of both the recording paper 1 and the transfer paper 6 changes depending on the roll diameter, which affects the reciprocating conveyance amount of the recording paper at the capstan 4, and causes misalignment between colors that are repeatedly recorded overlapping each other. is large.

On the other hand, Japanese Patent Publication No. 2-5188, Japanese Patent Publication No. 1-2630
No. 71 and Japanese Utility Model Application Publication No. 2-34268 disclose detection and control of the winding diameter of the transfer paper, a spring contact brake on the outer peripheral surface of the transfer paper supply roll, etc., but no fundamental solution has been reached.

[Means to solve the problem]

In order to achieve the above object, the present invention is characterized in that the recording paper supply roll and the transfer paper take-up roll are rotationally driven by contacting the outer diameter of each roll of the recording paper and the transfer paper.

[Effect]

According to the present invention, despite changes in the winding diameters of the recording paper and transfer paper on the supply roll and the transfer paper take-up roll, the back tension by the supply roll and the tensile force by the transfer paper take-up roll remain constant; The regulation by the capstan works effectively and the amount of recording paper conveyed is correct.

〔Example〕

During the conveyance of the recording paper 1 shown in FIG. This is done so that the amount of conveyance of the recording paper 1 is not influenced by the outer diameter of the roll on the supply roll 2. Also, transfer paper 6
In this case, the winding rotation drive of the transfer paper take-up roll 8 is controlled by the transport roller 1 that is in contact with the outer diameter of the transfer paper take-up roll.
This is done by a drive source (not shown) via 7, so that a constant amount of conveyance can always be obtained.

The Q field shown in FIG. 2 ((a), (to)) is an embodiment of the present invention, and is a rotary drive mechanism that comes into contact with the outer diameter of each roll of recording paper and transfer paper. In a), the roll outer diameter 20 is brought into contact with and driven through the conveyance roller 21.
Figure (B) shows the conveyor belt 2 installed on the transmission rollers 22 and 23.
2 (
C) is another embodiment of the present invention in which the roll outer diameter 20 is brought into contact with and driven through a conveyor belt provided with 22, 23, 244 transmission rollers.

〔Effect of the invention〕

As described above, the present invention has the advantage that even if the recording paper supply roll diameter and the transfer paper winding diameter change, there is no change in the conveyance amount of the recording paper and the transfer paper, and the recording paper conveyance amount is regulated by the capstan. is ensured correctly, tension changes due to the diameter of each roll are suppressed, color misregistration is prevented, and image quality is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a thermal transfer recording apparatus of the present invention, FIG. 2 is a diagram of a transport recording mechanism of the present invention, and FIG. 3 is a block diagram of a conventional thermal transfer recording apparatus.・Recording paper・Supply roll・Platen・Capstan Pinch roller Transfer paper 7・8・9・10゜14・15・16゜20・24・・・Transfer paper supply roll・・Transfer paper winding roll・・Thermal head 12 ... Motor 13 ... Gear ... Peeling guide roller ... Transfer paper guide roller 17 ... Conveyance roller ... Roll outer diameter ... Conveyance belt

Claims (1)

[Claims] In a thermal transfer recording device that uses a thermal head to press a transfer paper and recording paper against a platen roller to transfer and record the ink on the transfer paper to the recording paper, the rotational drive of the recording paper supply roll and the transfer paper take-up roll is A thermal transfer recording device characterized in that recording is performed by contacting the outer diameter of recording paper and transfer paper.