JP2530574Y2 - Top plate mounting device for thermal 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 an apparatus for mounting an upper plate on a thermal printer to which a leaf spring for pressing a thermal head is mounted.

[0003]

2. Description of the Related Art A conventional thermal printer is disclosed in
As shown in Japanese Patent Publication No. 226375, a platen is rotatably supported on a main body frame, a thermal head is brought into contact with the platen, and an upper plate (referred to as an upper case in the publication) is disposed above the thermal head. The thermal head is pressed against the platen by a spring provided between the upper plate and the thermal head.

In such a thermal printer, the pivot base of the upper plate and the pivot base of the upper plate are pivotally supported together with the pivot base of the thermal head by a pivot inserted from a shaft hole on one side of the body frame to a shaft hole on the other side. I have.

In some cases, the upper plate is fixed to the main body frame by screws.

[0006]

As described above, the conventional upper plate mounting means requires parts such as a pivot and a screw for fixing the upper plate to the main body frame, which increases the cost and increases the cost. There is a drawback that it takes time and effort to attach and detach the object.

The present invention has been made in view of such a point, and an object of the present invention is to make it possible to easily fix an upper plate to a main body frame using a reaction force of a leaf spring.

[Structure of the invention]

[0009]

According to the present invention, there is provided a main body frame.
11, a platen 14 rotatably provided on the main body frame 11, and a thermal head in contact with the platen 14.
21, a leaf spring 31 pressing the thermal head 21 toward the platen, and a mounting base located at the rear of the leaf spring 31 with the head pressing portion 32 of the leaf spring 31 protruding forward.
In a thermal printer having an upper plate 41 fixed to the main body frame 11 while holding the front plate 33, a front engagement member integrally provided on an upper portion of the main body frame 11 and locking a front portion 48 of the upper plate 41 from above is provided. Stop portions 53, and fitting portions 49, 54 provided on the front portion 48 of the upper plate 41 and the front locking portion 53 of the main body frame 11 and fitted to each other to fix the front portion 48 of the upper plate 41, , Rear of upper plate 41
This is an upper plate mounting device for a thermal printer, which is provided integrally with the main body frame 11 with respect to 50 and has a rear locking portion 56 which locks the rear portion 50 of the upper plate 41 from below.

[0010]

According to the present invention, when the front portion 48 of the upper plate 41 is inserted below the front locking portion 53, the upward reaction force acting on the head pressing portion 32 of the leaf spring 31 attached to the upper plate 41 is used. The front portion 48 of the upper plate 41 is pushed up and locked by the front locking portion 53.
At this time, the fitting portions 49 and 54 are fitted to prevent the upper plate 41 from shifting in the horizontal direction. On the other hand, the upward reaction force applied to the distal end of the leaf spring 31 pushes the rear portion 50 of the upper plate 41 downward with the front locking portion 53 as a fulcrum, and is locked by the rear locking portion 56 from below. Is done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in FIGS. 1 to 4 and a modification shown in FIG. 5 or FIG.

As shown in FIG. 1, a paper guide 12 is integrally provided below the main body frame 11, and a platen 14 is disposed above the paper guide 12 via a paper feed gap 13. The main body frame 11 is provided rotatably. The platen shaft 15 is driven by a motor (not shown) to rotate the platen 14.

A thermal head 21 is in contact with the platen 14. The thermal head 21 is integrally mounted on the lower surface of the heat sink 22.

The heat radiating plate 22 has a heat radiating plate main body 23 in close contact with the thermal head 21 and a bearing portion 25 fitted to a pin 24 mounted on the main body frame 11, which are integrally formed by extruded aluminum. The main body frame 11 is pivotally supported on the pin 24 as a fulcrum, and is pressed toward the platen by a leaf spring 31.

The leaf spring 31 has a mounting base 33 located at a rear portion thereof held by an upper plate 41 by means described later, with the head pressing portion 32 protruding forward. The upper plate 41 is fixed to an upper portion of the main body frame 11 by means described later.

Then, the front end of the heat radiating plate 22 is pressed down by the head pressing portion 32 of the leaf spring 31, and the thermal head 21 is pressed against the platen 14.

Next, FIGS. 2 and 3 show the mounting structure of the leaf spring 31. FIG. That is, the upper plate 41 in which the elongated hole 42 is formed
The rear center 43 is bent downward, and a part of the elongated hole 42 bent downward from the lower surface of the upper plate 41 forms an insertion groove 44. The central protruding piece 34 of the mounting base 33 of the leaf spring 31 that is in close contact with the lower surface of the upper plate 41 is inserted into the insertion groove 44.

The upper plate 41 has left and right projecting pieces behind the insertion groove 44.
The left and right projecting pieces 45 have projecting portions 46 projecting from the lower surfaces thereof. The rear ends of the left and right protruding pieces 35 protruding from the rear portion of the leaf spring 31 by the protruding portions 46 are pushed down behind the insertion grooves 44.

Further, a hole 36 as a positioning portion and a projection 47 are provided at a contact portion between the leaf spring 31 and the upper plate 41, and the hole 36 and the projection 47 are fitted to each other to position the leaf spring 31. ing.

The leaf spring 31 can be mounted by inserting the central projection 34 of the leaf spring 31 into the insertion groove 44 of the upper plate 41 and by rearwardly projecting the left and right projections 35 of the leaf spring 31. The convex part of the upper plate 41
46, and the projection 46 causes the central projection 34 of the leaf spring 31 to move upward.
Is pressed against the insertion groove 44 of the upper plate 41 so that the upper plate 41 and the mounting base 33 of the leaf spring 31 are brought into close contact with each other.

At the same time, the holes 36 and the projections 47 provided at the contact portions of the leaf spring 31 and the upper plate 41
By positioning the 31, the fitting state in the insertion groove 44 is fixed.

The above-described leaf spring mounting operation is instantaneous, and the leaf spring 31 can be mounted on the upper plate 41 with one touch without using screws.

FIG. 4 shows a mounting structure of the upper plate 41. As shown in FIG. That is, a notch groove 51 is formed in the upper portion of the main body frame 11, a concave groove 52 is provided in front of the notch groove 51, and a front locking portion 53 is provided integrally with the main body frame 11 above the concave groove 52. The front locking portion 53 locks the front portion 48 of the upper plate 41 pushed up by the reaction force of the leaf spring 31 from above. A hole 49 and a projection 54 as a fitting portion are provided in the front portion 48 of the upper plate 41 and the front locking portion 53 of the main body frame 11, and the hole 49 and the projection 54 are fitted to each other to form the upper plate 41. Horizontal displacement is prevented.

Further, an Ω groove 55 formed in an Ω shape is provided on the rear side of the cutout groove 51 of the main body frame 11 so as to face the concave groove 52, and the rear portion 50 of the upper plate 41 is fitted into the Ω groove 55. Have been combined.
A rear locking portion 56 for locking the rear portion 50 of the upper plate 41 from below and an upper holding portion 57 are provided at the entrance of the Ω groove 55. Inside the Ω-groove 55, there are provided a lower sloped surface 58 descending to the right and an upper sloped surface 59 inclined to the left.

The mounting method of the upper plate 41 is as follows.
Insert the rear part 50 of the upper part 41 into the Ω groove 55 in the downward slanted state, and then lower the front part 48 of the upper plate 41 to the lowermost part 51a of the notch groove 51. Shift to the left,
The front part 48 of the upper plate 41 is inserted into the groove 52.

At this time, since an upward reaction force acts on the head pressing portion 32 of the leaf spring 31 attached to the upper plate 41 as shown in FIG. 1, as shown in FIG. The front portion 48 of the upper plate 41 is pushed up by the reaction force of the leaf spring 31 and locked by the front locking portion 53, and is fixed to the main body frame 11 by fitting the hole 49 and the projection 54. .

On the other hand, the rear portion 50 of the upper plate 41 is pressed downward with the front locking portion 53 as a fulcrum by an upward reaction force applied to the distal end portion of the leaf spring 31. It is locked from below by a rear locking portion 56 provided in the portion.

In the above embodiment, the Ω groove 55 is formed in the main body frame 11. Instead of the Ω groove 55, a concave groove 55a as shown in FIG. The rear part 50 of the upper plate 41 may be locked from below by a rear locking part 56a provided on the side. A notch 55b as shown in FIG. 6 is formed, and the rear part 50 of the upper plate 41 is locked from below by a rear locking part 56b provided at the bottom of the notch 55b. Is also good.

[0029]

According to the present invention, the front portion of the upper plate holding the mounting base located at the rear of the leaf spring with the head pressing portion of the leaf spring protruding forward is provided on the front side of the main frame. The front part of the upper plate is fixed by the engaging part provided at the front part of the upper plate and the front locking part of the main body frame, and the rear part of the upper plate is fixed to the rear part of the main body frame. The upper part is easily fixed to the body frame by using the reaction force of the leaf spring without using parts such as pivots and screws as in the past, since the parts are locked from below by the locking part. And manufacturing man-hours can be reduced, cost can be reduced,
There is an advantage that the upper plate can be easily attached and detached in a short time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a thermal printer having an upper plate mounting device of the present invention.

FIG. 2 is a bottom view showing the mounting of the upper plate and the leaf spring according to the present invention.

FIG. 3 is a top view showing attachment of the upper plate.

FIG. 4 is an enlarged sectional view of a mounting portion of the upper plate.

FIG. 5 is a sectional view showing another example of the rear locking portion of the upper plate.

FIG. 6 is a sectional view showing still another example of a rear locking portion of the upper plate.

[Explanation of symbols]

 11 Body frame 14 Platen 21 Thermal head 31 Leaf spring 32 Head pressing part 33 Mounting base 41 Upper plate 48 Front part 49, 54 Holes and projections as fitting parts 50 Rear part 53 Front locking part 56 Rear locking part

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takaichi Matsumoto 1-19-43 Higashi-Oizumi, Nerima-ku, Tokyo Inside the Tamura Corporation (56) References JP-A-1-226376 (JP, A) Kaihei 4-107054 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A main body frame, a platen rotatably provided on the main body frame, a thermal head in contact with the platen, a leaf spring pressing the thermal head toward the platen, A thermal printer having an upper plate fixed to a main body frame while holding a mounting base located at the rear of the leaf spring with a head pressing portion of the spring protruding forward, and integrally provided at an upper portion of the main body frame. A front locking portion that locks the front portion of the upper plate from the upper side, and a front locking portion provided on the front portion of the upper plate and the front locking portion of the main body frame. A thermal printer comprising: a fixed fitting portion; and a rear locking portion integrally provided on the main body frame with respect to a rear portion of the upper plate and locking the rear portion of the upper plate from below. Plate mounting device.