KR0132865B1 - Printing apparatus - Google Patents

Abstract

An improved printer is disclosed for printing images with less edge margin at the leading edge of the printing paper. The printing paper (15) is fed to the drum (12) by a feed signal and clamped in the clamp groove (20) actuated by a solenoid (50). When the contact surface of the groove and drum get to the initial printing zone with the paper being clamped, the color of the ink ribbon (17) is found and the printing head (11) heat impresses the ink ribbon (17) and the paper (15) to print. Like this the edge margin at the leading edge of the paper gets narrower by projecting the clamp toward the exterior of the drum surface during clamping and locating the clamp just below the printing head.

Description

Printing device

1 is a schematic view showing a conventional printing apparatus.

2 is a schematic exploded perspective view showing a printing apparatus according to the present invention.

3 to 4 are views showing the operation of the printing apparatus according to the present invention.

Fig. 5A is a schematic diagram showing recording paper printed from a conventional printing apparatus.

(b) is a schematic diagram showing a recording sheet printed from a printing apparatus according to the present invention.

6 is a schematic cross-sectional view of a printing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

11: recording head 12: drum

13: guide roller 15: recording paper

17: ink ribbon 20: clamp

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly, to a printing apparatus whose structure is improved so that a margin of an image is printed at the leading end of a recording sheet. In general, a thermal transfer printer has a ribbon on a film coated with ink between a thermal recording head and a recording paper to be greeting, so that ink sublimated in a predetermined pattern by the thermal recording head is transferred to the recording paper. In particular, the color-type thermal transfer printer has a form in which the decomposed images of color-decomposed yellow, magenta, and cyan are overprinted three times in order to realize full color.

Fig. 1 shows an excerpt of a conventional thermal transfer printer. A recording paper cassette 6 is provided on one lower side of the platen drum 2, and a guide for conveying the recording paper 4 fed from the recording paper cassette 6 to the drum side in close contact with the drum side on the outer circumferential surface of the platen drum 2. The roller 3 is provided. The drum shaft 2 'is provided with a clamp 5 for clamping the tip of the recording paper 4 to transfer the recording paper 4 around the drum 2, and on the upper portion of the drum 2 a predetermined heating element. The heat recording head 1 generated by heat is provided so as to be movable vertically. On the other hand, an ink ribbon 7 is provided between the thermal recording head 1 and the recording paper 4 so that the ink is sublimed by heat generation and pressurization of the thermal recording head 1 so that an image is printed on the recording paper 4. It is.

The conventional printing apparatus first transfers the recording paper 4 from the cassette 6 to the drum 2 side, and when the recording paper 4 is positioned under the drum 2, the clamp 5 clamps the tip of the recording paper 4. do. Then, the clamp 5 and the drum 2 are rotated to transfer the tip of the recording paper 4 to a position slightly away from directly under the thermal recording head 1 (initial printing position) as shown in FIG. This is because, when the clamp 5 clamping the tip of the recording paper 4 is positioned at the initial printing position, it interferes with the clamp 5 when the recording head 1 is lowered for printing. Then, the thermal recording head 1 is lowered to press / heat the ink ribbon 7 to sublimate the ink to record an image. By the way, in the conventional thermal transfer printer as described above, in order to avoid interference between the recording head 1 and the clamp 5 at the start of printing, the tip of the recording paper 4 is far from the initial printing position with the clamp 5 clamped. Since the recording paper 4 is transferred to the position a, the image of the original cannot be printed at the leading end of the recording paper 4, and a large margin a occurs. As a result, as shown in FIG. 5 (a), a margin is left around the printed image, particularly at the tip of the recording paper 4, which causes a problem in appearance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a printing apparatus in which a margin of an image can be printed at the leading edge of a recording sheet. A printing apparatus for printing an image on a recording paper as a recording head, comprising a drum on which recording paper is fed and rotated, and a clamp which rotates together with the drum and clamps the recording paper. A groove is formed in the longitudinal direction, and a clamp conveying means for allowing the clamp to enter / release the groove, wherein the groove is connected to the groove at the initial printing position with the clamp clamping the tip of the recording paper. It is characterized in that the printing to be started. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 4, a paper feed cassette 16 for feeding the recording paper 15 to the drum 12 is provided at one lower side of the drum 12 driven by a motor generating power (not shown). On the outer circumferential surface of the drum 12, a plurality of guide rollers 13 are provided for conveying the recording paper 15 in close contact with the drum 12. A recording head 11 having a predetermined heating element is provided above the drum 12, and an ink ribbon 17 in which sublimation dye is applied sequentially in the plane between the recording head 11 and the drum 12. This predetermined winding means (not shown) is provided so that a transfer is possible. And as a characteristic configuration according to the invention, the groove 30 in the longitudinal direction on the outer peripheral surface of the drum 12, the clamp 20 for clamping and transporting the recording paper 15, the drum shaft 12 ' One end is slidably coupled to the clamp to provide a clamp conveying means for allowing the clamp 20 to enter / detach the groove 30.

The clamp transfer means, as shown in FIG. 6, forms an interlocking pin 21 on the clamp 20 and connects the solenoid 50 to the interlocking pin 21 to operate the solenoid 50. Accordingly, the clamp 20 enters / exits the groove 30. In addition, a guide means for guiding the clamp 20 to move only in the vertical direction of the groove 30 is provided, and the guide means has an opening 41 through which the clamp 20 penetrates as shown in FIG. ) Is provided on the side of the drum 12, the flange 40 is formed so that the clamp 20 is not rotated in the rotational direction of the drum 12 by the opening 41. In addition, a guide means for guiding the clamp 20 to move only in the vertical direction of the groove 30 is provided, and the guide means has an opening 41 through which the clamp 20 penetrates as shown in FIG. ) Is provided on the side of the drum 12, the flange 40 is formed so that the clamp 20 is not rotated in the rotational direction of the drum 12 by the opening 41.

The printing apparatus according to the present invention configured as described above has the following effects. When the recording sheet 15 is fed to the drum 12 side as shown in FIG. 3 according to the feeding signal and the tip of the recording sheet 15 is in the groove 30 of the drum 12, the solenoid 50 It operates to enter the clamp 20 into the groove 30 to clamp the recording paper 15 into the groove 30. When the drum 12 is rotated while the recording paper 15 is clamped as described above, the connecting portion between the groove 30 and the surface of the drum 12 comes to the initial printing position as shown in FIG. The color of the printing head 11 is lowered and printing is performed while the ink ribbon 17 and the recording paper 15 are thermally pressurized.

As described above, in the present invention, when the groove 30 is formed on the surface of the drum 12 to enter the tip of the recording paper 15 into the groove 30 and clamps the clamp 20, the clamp 20 is connected to the drum ( 12) By not protruding out of the plane, the clamp 20 can be positioned at the initial printing position, i.e., directly below the recording head 11 during printing, from the leading edge of the recording paper 15 to the initial printing position. You can narrow the gap. Therefore, the printing apparatus according to the present invention compares (a) of FIG. 5 showing the margin of the front and rear ends of the conventionally printed recording paper with (b) of FIG. 5 showing the recording paper printed by the printing apparatus of the present invention. This has the advantage of narrowing the margins.

Claims (4)

A printing apparatus for printing an image on recording paper as a recording head, comprising a drum on which recording paper is fed and rotated, and a clamp rotated with the drum and clamping the recording paper, wherein a groove is formed in an outer circumferential surface of the drum in a longitudinal direction; And a clamp conveying means for enabling the clamp to enter / detach the groove so that the clamp is positioned on the groove with the connection portion of the groove and the drum surface on the initial printing while clamping the tip of the recording paper. Printing device. The printing apparatus according to claim 1, wherein the clamp conveying means forms an interlocking pin on the clamp and connects a solenoid to the interlocking pin so that the clamp enters / exits the groove according to the operation of the solenoid. . The printing apparatus according to any one of claims 1 to 3, wherein guide means for guiding the clamp to move only in the vertical direction of the groove is provided. The printing apparatus according to claim 3, wherein the guide means is provided with a flange having an opening through which the clamp penetrates on the drum side, so that the clamp is not rotated in the rotational direction of the drum by the opening. .