JPH10202972A - Heat transfer printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat transfer printer, the marginal part of which can be made smaller than every by a method wherein the outer diameter of a capstan roller is made smaller and the deflection of the roller due to its smaller outer diameter is prevented from developing. SOLUTION: A capstan roller 2 having a smaller outer diameter is provided. On one side of the capstan roller 2 opposite to an image receiving paper 4, a supporting stand 3 for rectilinearly supporting the capstan roller 2 against the pressing force of a pinch roller 1 is provided. A platen roller 6 and a thermal head 5 can be brought near to the capstan roller 2 side by making the outer diameter of the capstan roller smaller, resulting in making marginal part 4b smaller. In addition, the deflection of the capstan roller 2 due to its smaller outer diameter can be prevented from developing by the supporting stand 3, resulting in realizing an exact paper feeding and image printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer printer using cut paper.

[0002]

2. Description of the Related Art As a conventional thermal transfer printer, for example, there is a printer described in Japanese Patent Application Laid-Open No. 3-192043. In this thermal transfer printer, as shown in a side view of FIG. 4 and a front view of FIG. 5, a paper feeding means including a pinch roller 11 and a capstan roller 12, a thermal head 15 for printing on an image receiving paper 14, and a platen roller The printing unit 16 is provided in the printer main body 17.

[0003] Pinch roller 11 and capstan roller 1
2 are provided in parallel with each other, and the capstan roller 12 has a spike portion 12b that sandwiches the image receiving paper 14 between the bearing portion 12a and the pinch roller 11 near the center in the axial center direction. 2b are connected by the straight part 2a.

The platen roller 16 is positioned close to and parallel to the capstan roller 12 on one side of the image receiving paper 14 to such an extent that rotation does not occur, and the upper surface thereof is substantially flush with the upper surface of the capstan roller 12. The thermal head 15 is mounted on the image receiving paper 1.
4, on the other side, it is provided to face the platen roller 16.

[0005] In such a thermal transfer printer, the image receiving paper 14 first includes the pinch roller 11 and the capstan roller 1.
It is sandwiched between the second spike portion 12b and the pressing force of about 5 kg, and is fed by the rotation of the capstan roller 12 to such an extent as to leave a grip margin as shown in FIG. Then
The capstan roller 12 is rotated in the reverse direction, and the image receiving paper 14 is printed while receiving a pressing force of about 3 kg between the thermal head 15 and the platen roller 16.

[0006]

However, in such a capstan roller type thermal transfer printer,
As described above, the position where the paper is gripped by the capstan roller 12 and the pinch roller 11 and the position where printing is performed by the thermal head 15 and the platen roller 16 are separated to some extent. Becomes The margin 14b increases as the outer diameter of the capstan roller 12 increases, and the outer diameter of the conventional capstan roller 12 is about 8 mm. Therefore, it is desirable that the margin 12b can be reduced.

An object of the present invention is to solve the above-mentioned problems and to provide a thermal transfer printer capable of reducing a margin.

[0008]

In order to solve the above-mentioned problems, a thermal transfer printer according to a first aspect of the present invention is provided with a capstan roller supported at both ends and a capstan roller provided in parallel with the capstan roller. A paper feeding means including a pinch roller for nipping and sending the image receiving paper together with the stun roller, and a platen roller provided on the same side as the capstan roller for the image receiving paper sent out by the paper feeding means and supporting the image receiving paper; And a printing means comprising a thermal head for printing on an image receiving paper supported on the platen roller, wherein the capstan roller is provided with a pinch roller. The holding position for holding the image receiving paper in between has a small outer diameter close to the printing position of the thermal head. And one side abuts the contradictory to the image receiving paper Pusutanrora, is provided with a support base to maintain a linear position that presses the capstan roller in the pinch roller.

According to a second aspect of the present invention, in the thermal transfer printer, the capstan roller has spike portions near both ends for driving the delivery of the image receiving paper, and the support stand is in contact with a central portion of the capstan roller. .

According to the above configuration, the platen roller and the thermal head can be moved closer to the capstan roller by reducing the outer diameter of the capstan roller.
The grip position and the printing position can be brought close to each other, and the margin becomes small. Since the deflection of the capstan roller due to the reduced outer diameter can be prevented by the support table, the paper can be fed accurately, and the occurrence of printing deviation can be prevented.

According to the configuration in which the spike portions are provided near both ends of the capstan roller and the support is provided so as to abut on the center portion of the capstan roller, the capstan roller can be effectively moved without obstructing the paper feed. Can be supported.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The thermal transfer printer shown in FIGS. 1 to 3 has substantially the same configuration as the conventional thermal transfer printer described with reference to FIGS. 4 and 5, and includes a paper feeder comprising a pinch roller 1 and a capstan roller 2. Means and a printing means comprising a thermal head 5 for printing on the image receiving paper 4 and a platen roller 6 are provided in the printer body 7.

The pinch roller 1 and the capstan roller 2 are provided in parallel with each other.
Has a spike portion 2b that sandwiches the image receiving paper 4 between the pinch roller 1 and the center of the bearing portion 2a in the axial direction, and the spike portions 2b are connected to each other by a straight portion 2a.

The platen roller 6 is located on the same side of the image receiving paper 4 as the capstan roller 2, close to and parallel to the image receiving paper 4 to such an extent that no rotation failure occurs, and the upper surface of the platen roller 6 is substantially at the same height as the capstan roller 2. The thermal head 5 is provided so as to face the platen roller 6 with the image receiving paper 4 interposed therebetween.

However, the capstan roller 2 has an outer diameter of 4 mm, which is smaller than the conventional one, so that the photographic printing paper 4 can be sandwiched between the pinch roller 1 and fed out. Is close to the printing position of the thermal head 5. A support 3 is provided on one side of the capstan roller 2 opposite to the image receiving paper 4 along the axial direction of the capstan roller 2, and the support 3 is provided at the protrusions 3 a at both ends. The pinch roller 1 contacts the straight portion 2a of the capstan roller 2 and
, The capstan roller 2 is maintained linearly.

In such a thermal transfer printer, the image receiving paper 4 is first held between the pinch roller 1 and the spike portion 2b of the capstan roller 2 with a pressing force of about 5 kg.
By the rotation of the capstan roller 2, the paper is fed to such an extent that a margin is left as shown in FIG. At this time, the protruding portion 3a of the support 3 is connected to the straight portion 2a of the capstan roller 2.
, The capstan roller 2 does not bend, and the image receiving paper 4 is accurately sent out.

Next, the capstan roller 2 is reversed, and the image receiving paper 4 is printed with a pressing force of about 3 kg applied between the thermal head 5 and the platen roller 6.
At this time, since the outer diameter of the capstan roller 2 is formed smaller than before, the blank portion 4b that cannot be printed becomes smaller than the conventional one, and the printing screen 4a becomes larger. Also at this time, the capstan roller 2 does not bend, and the image receiving paper 4 is accurately sent out, so that printing is performed well and no printing deviation occurs.

[0018]

As described above, according to the present invention, the outer diameter of the capstan roller is reduced, and the resulting deflection is prevented by the support table, so that the printing deviation caused by the deflection of the capstan roller is achieved. The margins can be reduced and the printing screen can be enlarged without causing any problems, and the appearance of the printed matter can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a thermal transfer printer according to an embodiment of the present invention.

FIG. 2 is a plan view of the thermal transfer printer shown in FIG.

FIG. 3 is a front view of the thermal transfer printer shown in FIG.

FIG. 4 is a side view of a conventional thermal transfer printer.

FIG. 5 is a front view of the thermal transfer printer shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pinch roller 2 Capstan roller 3 Support stand 4 Image receiving paper 5 Thermal head 6 Platen roller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Keiyuki Takahashi 1006, Oojidoma, Kadoma, Osaka Prefecture

Claims (2)

[Claims] 1. A paper feeding means comprising: a capstan roller supported at both ends; a pinch roller provided in parallel with the capstan roller and pinching and sending an image receiving paper together with the capstan roller; A platen roller that is provided on the same side as the capstan roller with respect to the image receiving paper sent out and supports the image receiving paper;
A thermal transfer printer provided with a printing head that is provided to face the platen roller and that prints on an image receiving paper supported on the platen roller,
The capstan roller has a small outer diameter such that a holding position for holding the image receiving paper between the pinch roller and the printing position of the thermal head is close to one side of the capstan roller that is opposite to the image receiving paper. A thermal transfer printer, comprising: a support that is in contact with and maintains a linear posture in which a capstan roller is pressed against a pinch roller. 2. The capstan roller has spike portions near both ends for driving the sending of the image receiving paper, and the support base is
2. The thermal transfer printer according to claim 1, wherein the thermal transfer printer contacts a central portion of the capstan roller.