JP2600072Y2 - Thermal head support device for line printer - Google Patents

Description

[Detailed description of the invention]

[Purpose of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal head supporting device in a line printer.

[0003]

2. Description of the Related Art As shown in FIG. 4, in a conventional small line printer, a platen 2 is rotatably supported on a main body frame 1 and a head support shaft 3 provided on the main body frame 1 is centered. The head holding plate 4 is pivotally supported pivotally,
A thermal head 5 is integrally provided on the lower surface of the head holding plate 4, and a thermal head (thermal line head) 5 is further provided by a spring 6 provided between the upper plate portion 1a of the main body frame 1 and the head holding plate 4. A thermal head support device for pressing the platen 2 is provided.

[0004]

As described above, the conventional thermal head supporting device requires the head support shaft 3, the head holding plate 4, and the spring 6 as the minimum necessary components, but the cost is low. In order to reduce the cost, it is necessary to further reduce the number of components.

The present invention has been made in view of such a point, and an object of the present invention is to reduce the number of components of a thermal head support device and reduce costs by replacing a head holding plate and a spring with a leaf spring. Is what you do.

[Structure of the device]

[0007]

According to the present invention, there is provided a main body frame.
In a line printer in which a thermal head 16 is movably provided with respect to a platen 13 pivotally supported by
An engagement groove 26 provided on the thermal head 16, a leaf spring 15 having one end fixed to the thermal head 16 and the other end engaged with the engagement groove 26 of the main body frame 11, and an integral part of the leaf spring 15. Bearing 22 and a head support attached to the body frame 11
; And a 14, the thermal head support head support shaft 14 in the line printer has a thermal head 16 through the leaf spring 15 by engaging the bearing portion 22 of the leaf spring 15 is pressed up <br/> Latin side Device.

[0008]

The plate spring 15 of the present invention has a function as a pressing spring for pressing the thermal head 16 against the platen 13 and a platen 13.
And a function as a head holding plate for elastically holding the thermal head 16 so as to absorb a parallel error between the head support shaft 14 and the thermal head 16.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS.

As shown in FIGS. 1 and 2, a platen 13 is rotatably supported on a body frame 11 by a platen shaft 12. A head support shaft 14 is provided so as to span the main body frame 11, and a pair of leaf springs 15 is
Thus, a thermal head (thermal line head) 16 facing the platen 13 is movably provided.

As shown in FIG. 3, this leaf spring 15
A fixing screw insertion hole 21 is provided at one end, a pair of head support shaft engaging bearings 22 and a U-groove 23 cut from the upper end of the bearing 22 are provided at an intermediate portion, and the other end is connected to the main body frame 11. An engaging portion 24 is provided.

Then, as shown in FIG. 1, one end of the leaf spring 15 is fixed to the fixing screw 25 inserted into the insertion hole 21.
By fixing the U-groove 23 of the bearing portion 22 provided at an intermediate portion of the leaf spring 15 with the head support shaft 14, the engaging portion 24 at the other end of the leaf spring 15 is Body frame 11
And engages with an engagement groove 26 as an engagement portion provided in the base member .

As a result, the thermal head 16 is
To the platen 13 side.
The plate spring 13, the plate spring 13, the head support shaft 14 and the engaging groove 26 at a fixed position receive the reaction force acting on the plate spring.
Hold 15

In this manner, the leaf spring 15 is
The head has a function as a pressing spring for pressing the thermal head 16 and a function as a head holding plate for elastically holding the thermal head 16 so as to absorb a parallel error between the head support shaft 14 and the platen 13. Therefore, platen 13
Thermal head for platen 13 over the entire length of the
16 pressing forces can be made uniform.

Although a pair of leaf springs 15 are used in the above embodiment, only one leaf spring 15 may be provided at the center of the thermal head 16.

[0016]

According to the present invention, one end of a leaf spring is fixed to a thermal head, an intermediate portion of the leaf spring is engaged with a head support shaft provided on the main body frame, and the other end of the leaf spring is connected to the main body frame. because engaged with the engagement groove, the leaf spring is not only functions as a thermal head pressing spring, the head holding the thermal head can be resiliently held so as to absorb a parallel error between the head support shaft and the platen It also functions as a plate, and the conventional two types of components, a head holding plate and a spring, can be reduced to only a plate spring, and the cost can be reduced by reducing the number of components. In addition, the thermal head is pressed toward the platen by the leaf spring, and the reaction force acting on the leaf spring is received at three points of the platen, the head support shaft, and the engagement groove of the main body frame at a fixed position, so that Since the engagement structure can hold the spring, the leaf spring can be easily assembled only by a simple engagement operation.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermal head support device in a line printer according to an embodiment of the present invention.

FIG. 2 is a front view of the thermal head support device.

FIG. 3 is a perspective view showing a leaf spring used in the thermal head supporting device.

FIG. 4 is a sectional view showing a conventional thermal head support device.

[Explanation of symbols]

11 main frame 13 platen 14 head shaft 15 leaf spring 16 thermal head 22 bearing 26 engaging groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takaichi Matsumoto 1-19-43 Higashi-Oizumi, Nerima-ku, Tokyo Inside Tamura Manufacturing Co., Ltd. (72) Akio Mizumura 1-1-19 Higashi-Oizumi, Nerima-ku, Tokyo No. 43 Inside of Tamura Manufacturing Co., Ltd. (56) References Japanese Utility Model Showa 60-8046 (JP, U) Japanese Utility Model Showa 57-68939 (JP, U) Japanese Utility Model Showa 56-165637 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A line printer in which a thermal head is movably provided on a platen pivotally supported by a main body frame, an engagement groove provided in the main body frame, one end of which is fixed to the thermal head, and A leaf spring having the other end engaged with the engagement groove , a bearing portion integrally formed at an intermediate portion of the leaf spring, and a head spindle attached to the main body frame , wherein the head spindle is a leaf spring bearing thermal head supporting device in the line printer thermal head via the leaf spring by engaging the part is characterized and this <br/> which is pressed against the platen side.