JPH0321961Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal head holder in a thermal recording device.

Prior Art Conventional thermal head holders do not have protrusions on the side in contact with the thermal head. Therefore, the thermal head is attached to the thermal head holder without protrusions, and it is identified from the outside with a leaf spring. The position is pressurized. Therefore, the position of the leaf spring has been a restriction on the layout.

Purpose The present invention has been developed in view of the above-mentioned circumstances, and is particularly designed to apply pressure to a thermal head with good positional accuracy and uniform force using a simple configuration, especially in thermal recording devices such as facsimile machines. It has been made possible to do so.

Configuration In order to achieve the above object, the present invention has a circular hole 8 for positioning provided on the back side of the thermal head.
A set of half-pull-out protrusions 3 arranged in the longitudinal direction and having a half-pull-out protrusion 1 for positioning that is fitted into the
and a set of projections 2 with screw holes arranged in the longitudinal direction, each having a screw passage hole for screwing the fixing screw 11 into the fixing screw hole 10 provided on the back surface of the thermal head, and 2, the four protrusions 2, 2, 3, and 3 of the two sets are distributed in the center, and the half-removal protrusion 1 is fitted into the positioning round hole 8 and positioned. , the fixing screw 11 is in the fixing screw hole 10
It is characterized by being screwed into and fixed. Hereinafter, the present invention will be explained based on embodiments.

1 is a back view for explaining an embodiment of the thermal head holder according to the present invention, FIG. 2 is a side view, and FIGS. 3a and 3b are cross-sectional views taken along line A-A in FIG. Figure a is a cross-sectional view of the holder side, and Figure b is a cross-sectional view of the head side. In the figure, 1, 1 is a protrusion with a recognition hole (a protrusion on a protrusion without a screw hole), 2, 2 is a protrusion with a screw hole, and 3, 3 is a half-pull protrusion (a protrusion without a screw hole). , 4, 4 are screw passage holes, 5, 5 are fulcrums, and 6, 6 are pressure spring mounting holes, which are provided in the thermal head holder. 7 is a thermal head, and the thermal head 7 has the above-mentioned half-extraction protrusions 1, 1 and screw hole protrusions 2, 2.
A circular hole 8 for positioning, a long hole 9 for positioning, and screw holes 10, 10 for fixing are provided facing each other. 11 is a fixing screw, 12 is a platen roller, and 13 is a pressure spring.

No. 1 and No. 2 show the state in which the thermal head 7 is fixed to the thermal head holder, and both rotate around the fulcrum shaft 5, and as is well known, they are applied to the platen roller 12 while holding the thermal recording paper between them. It's starting to feel like pressure. The thermal head 7 has a round hole 8 and a long hole 9 for positioning, and a screw hole 1 for fixing.
0 and 10 are machined, but the round hole 8 and the elongated hole 9 are lined up in the longitudinal direction, and the screw hole 1 is placed in the center distribution.
0 and 10 are also lined up in the longitudinal direction. Furthermore, the four protrusions, the half-extracting protrusions 3, 3 and the protrusions with screw holes 2, 2, are also centered and arranged two by two in the longitudinal direction. Round hole 8 on this thermal head side
The half-extracting protrusions 1, 1 of the half-extracting protrusions 3, 3 on the thermal head holder side fit into the long holes 9 and 9 with point contact, thereby determining the position of the thermal head and the thermal head holder, and fixing one of the thermal head holders. The screw 11 is screwed into the screw hole 10 of the thermal head through the screw hole 4 of the projection 2 with a screw hole of the thermal head holder, thereby fixing the thermal head to the thermal head holder. In this way, the thermal head and the thermal head holder are integrally constructed, and pressure can be applied to the thermal head holder from any position as long as it is equally spaced on the left and right sides. For example, the position of the pressurizing spring mounting hole 6 can be freely selected, or the pressurizing force can be applied to the thermal head holder by pushing it with a leaf spring from the back of the thermal head holder instead of using a spring.

Effects Since the thermal head and the thermal head holder are brought into contact with each other through point contact at the half-opened part, it is only necessary to determine the flatness or positioning of that part, and the thermal head and thermal When the thermal head and the thermal head holder are attached flatly, it is possible to eliminate bending, twisting, distortion, etc. of the thermal head or thermal head holder surface caused by different flatness, and there is no need to increase the processing precision for flatness over the entire surface. .

Therefore, the thermal head holder has a simple structure, can be fixed with high positioning accuracy, and can apply pressure with uniform force.

[Brief explanation of the drawing]

Fig. 1 is a back view of the thermal head holder according to the present invention, Fig. 2 is a side view, and Figs. 3 a and b.
1 is a sectional view taken along line A-A in FIG. 1... Half-extraction protrusion, 2... Protrusion with screw hole,
3...Half-extracting projection, 4...Screw through hole, 5...Fully point, 6...Pressure spring mounting hole, 7...Thermal head, 8...Round hole for positioning, 9...Elongated hole for positioning, 10... Fixing screw hole, 11... Fixing screw, 12... Platen roller, 13... Pressure spring.

Claims (1)

[Scope of utility model registration request] It has a half-removal protrusion for positioning that is fitted into a circular hole for positioning provided on the back surface of the thermal head, and a set of half-ejection protrusions arranged in the longitudinal direction, and a set of half-ejection protrusions provided on the back surface of the thermal head. The fixing screw hole has a screw passage hole for screwing a fixing screw into the fixing screw hole, and a set of protrusions with screw passage holes arranged in the longitudinal direction;
The protrusions are centrally distributed, the half-removal protrusion is fitted into the positioning round hole for positioning, and the fixing screw is screwed into the fixing screw hole to be fixed. Thermal head holder.