JP2590420Y2 - Thermal printhead mounting device - 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 print head used for a printing device such as a facsimile, and a device for mounting the printing device on the printing device.

[0002]

2. Description of the Related Art In general, a thermal print head used in a printing apparatus such as a facsimile machine has a head substrate on which a heating resistor for printing is formed on an upper surface, which is fixed to an upper surface of a metal heat radiating plate by an adhesive or the like. The radiator plate is attached by screwing it to a frame member or the like in the printing device.

[0003] Japanese Patent Application Laid-Open No. 2-295557 as prior art
Japanese Patent Application Laid-Open Publication No. H11-163873 proposes that the heat sink be made of a thin metal plate. That is, as shown in FIGS. 4 to 6, the heat radiating plate 1 is formed of a thin metal plate so as to have a downward U-shaped cross section, and the heat radiating plate 1 is provided on the upper surface with the heating resistor 3 on the upper surface. While the substrate 2 is fixed with an adhesive or the like, burring portions 4 having female screw holes 4a are integrally formed at a plurality of locations on the upper surface of the heat radiating plate 1, and the heat radiating plate 1 with the head substrate 2 is printed. The tip of the mounting screw 7 placed on the frame member 5 or the like of the device and inserted into the bolt hole 6 from the lower surface side of the frame member 5 is screwed into the female screw hole 4a of each burring portion 4 in the heat sink 1. After joining
The heat sink 1 with the head substrate 2 is mounted on the frame member 5 by screwing in each of the mounting screws 7.

[0004]

However, as in this mounting device, a burring portion 4 having a female screw hole 4a is integrally formed on a heat radiating plate 1 made of a thin metal plate having a head substrate 2 fixed to the upper surface, as in this mounting device. Female screw hole 4a in this burring portion 4
In the case where the mounting screw 7 is screwed in after the tip of the mounting screw 7 is screwed in, the tip of the mounting screw 7 may be screwed in the fully screwed state. The burring portion 4 must be configured so as not to protrude from the upper surface of the heat radiating plate 1, and the number of threads that can be screwed into the female screw hole 4a in the burring portion 4 is small. At the time, there was a problem that crushing the screw thread occurred frequently.

In order to solve this problem, the burring portion 4 having the female screw hole 4a may be provided at a portion of the heat sink 1 which is separated from the head substrate 2, as shown in FIG. With this configuration, the width W of the heat radiating plate 1 must be increased accordingly, resulting in an increase in the size of the heat radiating plate. It is a technical object of the present invention to prevent the above-mentioned problem from being caused when a heat sink is made of a thin metal plate.

[0006]

In order to achieve this technical object, the present invention provides a head substrate in which a heating resistor for printing is formed on the upper surface, and a heat radiator formed in a U-shaped cross section with a thin metal plate. A thermal print head comprising the heat sink and the head substrate fixed to the upper surface of the heat sink, at a place where the head substrate contacts the heat sink, a recess is formed downwardly, and a recess is formed. A burring portion having a female screw hole into which the mounting screw is screwed is integrally formed on the bottom plate. "

[0007]

[Operation] In this configuration, since the tip of the mounting screw is screwed into the female screw hole in the burring portion and then looked into the recess, the tip of the mounting screw is screwed into the female screw hole. In a state where the number of threads to be formed is sufficiently secured, it is possible to reliably prevent the protrusion from the upper surface of the heat sink.

[0008]

According to the present invention, therefore, a reliable mounting strength can be obtained without increasing the lateral width of the heat sink, and at the time of mounting and dismounting, the screw thread at the mounting screw and the female screw hole. This has the effect of greatly reducing damage to the device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this figure, reference numeral 11 denotes a heat radiating plate formed of a thin metal plate such as a carbon steel plate in a downward U-shaped cross section. Reference numeral 12 denotes a head substrate on which a heating resistor 13 for printing is formed on the upper surface. The head substrate 12 is fixed to the upper surface of the heat sink 11 with an adhesive or the like.

A plurality of recesses 18 are formed in a plurality of locations on the upper surface of the radiator plate 11 in a region where the head substrate 12 contacts, and a female screw hole 14a is provided in a bottom plate 18a in each of the recesses 18. The burring portion 14 is integrally formed. Then, when attaching the heat radiating plate 11 with the head substrate 12 to the frame member 15 in the printing apparatus, the heat radiating plate 11 with the head substrate 12 is placed on the frame member 15 and inserted into the bolt hole 16 from the lower surface side of the frame member 15. After the tip of the mounting screw 17 is screwed into the female screw hole 14a of each burring portion 14 of the heat sink 11, the mounting screw 17
Screw it in.

Then, as shown in FIG. 3, the distal end of each of the mounting screws 17 is screwed into the female screw hole 14a of the burring portion 14 and then looked into the recessed portion 18. Can be reliably prevented from protruding from the upper surface of the heat radiating plate 11 in a state where the number of screw threads screwed into the female screw hole 14a is sufficiently secured.

In FIG. 3, reference numeral 19 denotes a platen roller pressed against the heating resistor 13 of the head substrate 12.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a thermal printhead according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing a mounting state of the thermal print head according to the embodiment of the present invention.

FIG. 4 is an exploded perspective view of a conventional thermal print head.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 4;

FIG. 6 is a cross-sectional view showing a mounting state of a conventional thermal print head.

FIG. 7 is a cross-sectional view showing another example in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heat sink 12 Head board 13 Heating resistor 14 Burring 14a Female screw hole 15 Frame member 16 Bolt hole 17 Mounting screw 18 Depression

Claims (1)

(57) [Scope of request for utility model registration] 1. A head substrate having a heating resistor for printing formed on an upper surface thereof, and a heat radiating plate having a U-shaped cross section made of a thin metal plate, wherein the head substrate is fixed to the upper surface of the heat radiating plate. In the thermal print head, a burring portion having a female screw hole into which a mounting screw is screwed into a bottom plate in the concave portion at a position where the head substrate comes into contact with the heat radiating plate, and a bottom plate in this concave portion is formed. A thermal printhead mounting device, characterized by integrally forming the same.