JP2600983Y2 - Thermal head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal head used for a heat-sensitive system and a thermal transfer system in various printing apparatuses such as facsimile machines and word processors.

[0002]

2. Description of the Related Art Generally, a thermal head used in this type of heat-sensitive system and thermal transfer system has a structure shown in FIG. To explain this, reference numeral 1 denotes a thermal head, which is a line-type thermal head in which the heating resistors 11 are formed linearly from the front to the back of the drawing. Reference numeral 2 denotes a platen roller, a part of the peripheral surface of which is in contact with the heating resistor 11 and is driven to rotate counterclockwise in the drawing.

In such a configuration, the leading end of the recording paper 4, which is a roll-shaped thermal paper, is moved from the upstream side B where the recording paper 4 is supplied to a contact portion between the thermal head 1 and the platen roller 2, that is, a heating portion. The heating resistor 11 is inserted into a portion where the heating resistor 11 is provided. The recording paper 4 is pressed against the thermal head 1 by the platen roller 2, printing is performed on the recording paper 4 by the heating resistor 11, and the recording paper 4 is sequentially sent to the heating resistor 11 by the rotation of the platen roller 2, and the desired heating is performed. Characters or figures are printed.

[0004]

However, in the conventional thermal head described above, when dust 6 adheres to the recording paper 4 as shown in FIG. Is wound between the platen roller 2 and the thermal head 1 and is pressed against the heating resistor 11. For this reason, the printing quality is degraded by the dust 6,
There has been a problem that the heating resistor 11 is damaged by the dust 6.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to remove dust and the like adhering to recording paper beforehand and to eliminate an adverse effect on a heat generating portion. Accordingly, it is an object of the present invention to provide a thermal head in which printing quality is stabilized.

[0006]

In order to achieve this object, a thermal head according to the present invention is a thermal head which contacts a peripheral surface of a platen roller and prints on a recording sheet inserted between the platen rollers. there are, by urethane said abut against the peripheral surface of the platen roller at a site upstream of the recording paper than the contact portion is provided in the platen roller of the thermal head, extending in the printing direction or one thermal head
A formed locking member is provided. In addition, the present invention
The thermal head that comes in contact with the platen roller
That prints on the recording paper inserted between the platen rollers
A thermal head, wherein a platen of the thermal head is provided.
A portion on the upstream side where the recording paper is supplied from the contact portion of the roller
Contact the platen roller and the thermal head
Locking part formed by Teflon extending in the printing direction of
Materials are provided.

[0007]

According to the present invention, urethane or tephrophore which comes into contact with the peripheral surface of the platen roller is located on the upstream side where the recording paper is supplied from the contact portion of the platen roller of the thermal head.
Since the locking member extending in the printing direction of the formed thermal head by emissions is provided, the printing surface of the recording paper to be supplied is brought into contact with the locking member prior to contact with the thermal head, the recording sheet Dust and the like attached to the printing surface are eliminated beforehand .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a thermal head according to the present invention,
(A) is a side view, (b) is a bottom view. In the figure, the same components as those of the prior art are denoted by the same reference numerals, and detailed description is omitted. The features of the present invention are:
An elastic member that contacts the peripheral surface A of the platen roller 2 at the contact portion of the platen roller 2 of the thermal head 1 on the lower surface of the thermal head 1, that is, at a portion B on the upstream side where the recording paper 4 is supplied from the heating resistor 11. In that the locking member 12 formed by the above is provided.

The locking member 12 is arranged in parallel with the heating resistor 11 as shown in FIG.
It has substantially the same length as the heating resistor 11. The locking member 12 may be any member as long as it is flexible and smooth. In this embodiment, urethane or Teflon is used.

In such a configuration, when the recording paper 4 is inserted between the platen roller 2 and the thermal head 1 from the upstream side B where the recording paper 4 is supplied for printing, the peripheral surface of the platen roller 2 Since the locking member 12 is in contact with the printing surface of the recording paper 4 at the point A, even if dust or the like adheres to the printing surface of the recording paper 4, the dust is generated by the heating resistor 1.
Before reaching 1, it is removed by this locking member 12. For this reason, the heating resistor 11 is not damaged and the printing quality is not degraded.

FIG. 2 is an enlarged side sectional view showing a second embodiment of the present invention. In the second embodiment, a protective glass 13 serving as a protective layer covering the surface of the thermal head 1 has a semicircular cross section, has a length substantially equal to that of the heating resistor 11, and is parallel to the heating resistor 11. Protrusions 14 are provided.
Reference numeral 15 denotes a locking member 15 formed in a plate shape.
A curved portion 16 is formed, and the curved portion 16 is fitted on the projection 14.

Since the curved portion 16 is fitted to the projection 14 as described above, the curved portion 16 abuts on the platen roller 2 with a uniform pressing force along the body axis direction.
The upper dust is removed without unevenness and without being left behind. Further, since the curved portion 16 is in contact with the recording paper 4, the recording paper is not damaged or damaged.

In the present embodiment, the cross section of the projection 14 is semicircular, but the present invention is not limited to this. The cross section may be rectangular or triangular. In short, the curved portion 16 extends along the heating resistor 11. It goes without saying that any shape may be used as long as the shape uniformly contacts the peripheral surface of the platen roller 2.

[0014]

According to the present invention, as described above, the thermal head contacts the peripheral surface of the platen roller with the urethane or Teflon at the upstream side where the recording paper is supplied from the contact portion of the platen roller. Since a locking member formed and extending in the printing direction of the thermal head is provided,
Dust and the like adhering to the printing surface of the recording paper are removed by the locking member before reaching the heat generating portion, so that the print quality is not reduced and the heat generating portion is also prevented from being damaged. In addition, locking part
Urethane or Tef made of soft and smooth material
Paper, scratches or breaks the recording paper.
I do not even do.

[Brief description of the drawings]

1A and 1B show a thermal head according to the present invention, wherein FIG. 1A is a side view and FIG. 1B is a bottom view.

FIG. 2 is an enlarged side sectional view of a second embodiment of the thermal head according to the present invention.

FIG. 3 is a side view of a conventional thermal head.

FIG. 4 is an enlarged side view of a conventional thermal head.

[Description of Signs] 1 Thermal head 2 Platen roller 4 Recording paper 6 Dust 11 Heating resistor 12 Locking member 13 Protective glass 14 Projection 15 Locking member 16 Curved portion

Claims (2)

(57) [Scope of request for utility model registration] A thermal head for printing on a recording sheet inserted between the platen rollers, wherein the recording paper is supplied from a contact portion of the platen roller of the thermal head. that a portion of the upstream, the thermal head come into contact with the peripheral surface, the locking member formed by urethane extending in the printing direction if one thermal head is characterized in that provided in the platen roller. A peripheral surface of a platen roller abutting against the platen roller;
Thermal to print on the recording paper inserted between the ten rollers
A platen roller of the thermal head.
At the upstream side where the recording paper is supplied from the contact part of
Abuts against the peripheral surface of the platen roller and the thermal head
Locking part formed by Teflon extending in the printing direction of
A thermal head characterized by being provided with a material.