JPH0450123Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a heat-sensitive recording head used in a facsimile machine that employs a heat-sensitive recording method.

[Conventional technology]

A heating head, in which a plurality of heating elements are arranged in the same direction as the feeding direction of the thermal recording paper, is moved in a direction perpendicular to the feeding direction of the recording paper while pressing it against the thermal recording paper. A thermal recording method has been proposed in which a desired point on a thermal recording paper is colored by appropriately generating heat, and a desired image is recorded on the thermal recording paper by sequentially repeating this operation while feeding the thermal recording paper. In such a recording system, in order to sufficiently press the heat-generating head against the heat-sensitive recording paper, a platen extending in the direction of movement of the heat-generating head is provided so as to be in contact with the back surface of the heat-sensitive recording paper.

[Problem that the invention attempts to solve]

However, since the platen is usually made of an elastic material such as rubber, it is difficult to make its surface perfectly flat and parallel to the heat generating head. Further, even if the flatness is initially satisfactory, it gradually deforms and gradually becomes uneven in the direction of movement of the heating head.

As a result, the force with which the heating head presses the thermal recording paper interposed between the platen and the platen becomes uneven.
There was a problem that density unevenness occurred in the coloring area.

[Means for solving problems]

The thermal recording head of the present invention has been developed in view of the above problems, and includes a base 2 that moves along a guide shaft 5 while maintaining its posture, and a base 2 that extends from the base in a direction perpendicular to the guide shaft. and,
A mounting body 3 rotatably provided on the base so as to move toward and away from the platen 8, and a heating element row 41 on the front surface.
are arranged in a direction perpendicular to the guide shaft, extend from the tip of the mounting body in the opposite direction to the direction in which the mounting body extends, and are rotatable to the mounting body so as to move toward and away from the platen. The heat-generating head 4 is provided, and the mounting body and the heat-generating head are biased so as to press against the thermal recording paper with the back facing the platen.

[Effect]

Press the thermal recording paper so that the heating head is always parallel to the platen.

〔Example〕

Hereinafter, the present invention will be described in detail along with examples.

The figure is a perspective view showing an embodiment of the present invention. The thermal recording head 1 is roughly composed of a base 2, a mounting body 3, and a heat generating head 4. The base 2 has a cylindrical sleeve 2 into which the guide shaft 5 is fitted.
1 is integrally formed, and this base 2 is supported so as to be movable along a guide shaft 5.
Note that a guide member (not shown) is provided parallel to the guide shaft 5, and the guide supports the bottom of the base 2, so that the base 2 is always kept movable in a horizontal state. .

The mounting body 3 includes arms 31 and 32 and legs 33 and 34, and the legs 33 and 34 are rotatably attached to the tip of the base 2. One end of a spring 6 is fixed to the back surface of the mounting body 3. The other end of this spring 6 is fixed to a projection 22 on a cylindrical sleeve 21, and the spring 6 elastically holds the mounting body 3 at a slightly forwardly inclined angle. Further, a heat generating head 4 is rotatably suspended from the arms 31 and 32, and is urged by gravity in a direction toward a platen, which will be described later.

A heating element row 41 is formed on the surface of the heating head 4, in which a plurality of dot-shaped heating elements are arranged vertically. Further, an end of a flat cable 7 is attached to the lower end of the heating head 4, and each heating element of the heating element array 41 and each line of the flat cable 7 are electrically connected via a wiring part 42. has been done. Note that the flat cable 7 slightly pushes the lower end of the heat generating head 4 forward due to its elastic force. Therefore, when no external force is applied, the lower end of the heat generating head 4 is pushed forward while the upper end remains, resulting in a so-called backward tilted state.

During recording, a platen 8 is placed in front of the heat generating head 4, and a thermal recording paper (not shown) is interposed between the two. The surface of the platen 8 facing the heat generating head is vertical, and the platen 8 faces the heat generating head 4.
It is placed in such a position that it is pushed backwards. If you look at this positional relationship with the platen 8 fixed, you will see that
The thermal recording head 1 approaches the platen 8 until the forward-inclined mount 3 becomes almost vertical, and the heat-generating head 4 is in a state pressing the platen 8.

Although it is desirable that the surface of the platen 8 be vertical and completely parallel to the guide shaft 5, in reality it may be slightly wavy in the direction of the guide shaft 5 or be oblique to the guide shaft 5. are doing. Therefore, the mounting body 3 swings back and forth as the thermal recording head 1 moves. That is,
The angle of the mounting body 3 with respect to the platen 8 changes depending on the position of the thermal recording head 1. However, since the heat generating head 4 is rotatably suspended from the mounting body 3, even if the angle of the mounting body 3 with respect to the platen 8 changes, the parallelism between the heat generating head 4 and the platen 8 is always maintained. Therefore, the heating element array 41 comes into uniform pressure contact with the heat-sensitive recording paper located between it and the platen 8.

In this embodiment, since the flat cable 7 lightly pushes the lower end of the heat generating head 4 forward, even if the verticality of the platen 8 collapses, the heat generating head 4
is in close contact with the platen 8.

[Effect of idea]

As explained above, according to the thermal recording head of the present invention, the heating head presses the thermal recording paper so that it is always parallel to the platen, so all the heating elements on the heating head are always pressed against the thermal recording paper. Apply appropriate pressure. Therefore, the phenomenon of density unevenness does not occur at all, and a clear image can be obtained.

[Brief explanation of the drawing]

The figure is a perspective view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Thermal recording head, 2...Base, 3...Mounting body, 4...Heating head, 5...Guide shaft, 6...Spring, 8...Platen.

Claims (1)

[Claims for Utility Model Registration] A base that moves along a guide shaft while maintaining its posture; and a base that extends from the base in a direction perpendicular to the guide shaft and moves toward and away from the platen. a mounting body rotatably provided on a base; a row of heating elements formed on the front in a direction perpendicular to the guide shaft; extending from a tip of the mounting body in a direction opposite to the direction in which the mounting body extends; and a heating head rotatably provided on the mounting body so as to move toward and away from the platen, and the mounting body and the heating head are mounted so as to press against the thermal recording paper with the back of the platen. A heat-sensitive recording head characterized by