JPS6213805Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a print head used in a serial dot printer.

(2) Prior Art and Problems Figure 1 is a front view of a conventional print head, Figure 2 is a side view of Figure 1, Figure 3 is an enlarged half-sectional view of Figure 2, and Figure 4 is an enlarged half-sectional view of Figure 2. FIG. 4 is a front view of the printing head of FIG. 3 with the wire guide removed.

Conventionally, a print head 1 has a base 2, as shown in FIGS. 1 to 4.
A cylindrical permanent magnet 3 is provided on the top.
A leaf spring 6 is connected to the permanent magnet 3 via a spacer 5.
Side magnetic path 16, spacer 9 and wire guide 10
are provided in a stacked manner, and all of them are fastened and fixed by screws 11 that are fastened to screw holes 10c with counterbore holes 10b of the wire guide 10. Armature 12 is attached to leaf spring 6.
A printing wire 13 is connected to the armature 12. The tip of the wire 13 is guided by the guide portion 10a of the wire guide 10 so as to be movable in the directions of arrows A and B, and an electromagnet 15 is attached to each armature 12 on the base 2 inside the permanent magnet 3. It is set up in a corresponding manner.

Typically, each armature 12 includes a permanent magnet 3,
Due to the magnetic circuit formed from the leaf spring 6, the iron core 15a of the electromagnet 15, the base 2, etc., the leaf spring 6
The coil 1 of the electromagnet 15 is attracted to the iron core 15a against the elasticity of the electromagnet 15.
5b is reversely excited to cancel the magnetic flux of the permanent magnet 3, and the armature 12 is driven to protrude in the direction of arrow A together with the printing wire 13 by the elasticity of the leaf spring 6, thereby performing a printing operation. Normally, in order to improve the operating speed of the armature 12, etc., a side magnetic path 16 is provided in a position close to the armature 12, but the gap W between the side magnetic path 16 and the armature 12 is set as narrow as possible. is desirable. If this gap W is extremely biased, there is a risk that they will come into contact and cause trouble in the operation of the armature 12. Therefore, when assembling the print head 1, the side magnetic path 16 and the armature 12 are installed so that the gap W is appropriate. It is necessary to accurately position the leaf spring 6. However, in the conventional print head 1, the leaf spring 6, side magnetic path 16, spacers 5, 9 are fixed to the base 2 through the permanent magnet 3, together with the wire guide 10, by screws 11. 11, the side magnetic path 16, leaf spring 6, and armature 12 were covered by the guide 10, making it impossible to confirm the state of the gap W. Therefore, armature 12
In order to avoid contact between the head 1 and the side magnetic path 16, improve the manufacturing precision of parts such as the leaf spring 6, armature 12, and side magnetic path 16, or make the gap W wider than the appropriate value to improve the performance of the head 1. There was no other way but to sacrifice to some extent.

(3) Purpose of the invention In view of the above-mentioned circumstances, the present invention is designed to provide a printed image that allows the side magnetic path and leaf spring to be adjusted and fixed while visually checking the gap between the armature and the side magnetic path before installing the wire guide. The purpose is to provide a head.

(4) Structure of the invention In other words, the invention provides separate fastening means for fastening and fixing the leaf spring and the side magnetic path and fastening means for fastening and fixing the wire guide, and the gap between the armature and the side magnetic path can be checked with the naked eye. It is constructed in such a way that it can be adjusted and fixed while being checked.

(5) Embodiments of the invention Hereinafter, the invention will be specifically explained based on the embodiments shown in the drawings.

FIG. 5 is a side view showing an embodiment of the printing head according to the present invention, and FIG. 6 is a front view of the printing head of FIG. 5 with the wire guide removed.

The print head 1 has a base 2, and the outline of the print head 1 has already been shown in FIGS. 1 to 4.
Since the explanation has been made with reference to the figures, only the points that are different from those will be explained here, and the same parts will be given the same reference numerals and the explanation of those parts will be omitted.

As shown in FIG. 5, the wire guide 10 is provided with a plurality of screw holes 10c with counterbore holes 10b for tightening the guide, and a plurality of relief holes 10d larger than the head 17a of the screw 17. In the escape hole 10d, a screw 17 connects the spacers 5 and 9, the side magnetic path 16, and the leaf spring 6 to the permanent magnet 3.
It is provided in such a way that it is fastened and fixed to the base 2 via. In addition, the screw hole 10 with a counterbore hole 10b
A screw 19 is provided at c to fasten and fix the wire guide 10 to the base 2 via the permanent magnet 3.

Since the present invention has the above configuration,
When assembling the print head 1, first, the spacers 5 and 9, the side magnetic path 16, and the leaf spring 6 are fixed using screws 17 while adjusting the gap W. Next, the wire guide 10 is placed over the spacer 9, and the screw 19 is inserted into the screw hole 10c with the counterbore hole 10b to fix the guide 10 to the base 2, completing the assembly. At this time, the head 17 of the screw 17
Since the guide 10 is fitted into the escape hole 10c of the guide 10, the guide 10 can be smoothly attached with the screw 19.

(6) Effects of the invention As explained above, according to the invention, the screw 19, which is the means for tightening and fixing the wire guide 10,
Since the screws 17, which are the means for fastening and fixing the leaf spring 6 and the side magnetic path 16, are provided separately, the side magnetic path 16 and the leaf spring 6 can be tightened before the wire guide 10 is attached.
, the gap W between the armature 12 and the side magnetic path 16
The armature 12 and side magnetic path 1 can be adjusted and fixed while checking with the naked eye.
6 can be avoided, making it possible to provide an inexpensive and high-performance print head 1.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional print head; Figure 2 is a front view of a conventional print head;
3 is an enlarged half-sectional view of FIG. 2, FIG. 4 is a front view of the print head shown in FIG. 3 with the wire guide removed, and FIG. 5 is a print head according to the present invention. FIG. 6 is a side view showing one embodiment of the fifth embodiment.
FIG. 3 is a front view of the print head shown in the figure with the wire guide removed. 1... Printing head, 6... Leaf spring, 10... Wire guide, 12... Armature, 13... Printing wire, 15... Electromagnet, 16... Side magnetic path, 1
7, 19... fastening means (screw), W... gap.

Claims (1)

[Claims for Utility Model Registration] A base 2, a cylindrical permanent magnet 3, a plurality of leaf springs 6 having an armature 12 made of a magnetic material to which a printing wire 13 is bonded and which is attracted to the electromagnet; a side magnetic path 16 having a hole passing through to accommodate each armature 12 and having a plurality of magnetic paths facing the side surface of each armature with a predetermined gap therebetween; a side opposite to the leaf spring with respect to the electromagnet; The permanent magnet 2, the leaf spring 6, the side magnetic path 16, and the wire guide 10 are stacked in this order on the base 2 and are fastened and fixed to the base 2. In this print head, a screw 17 is provided for fastening and fixing the permanent magnet 3, the leaf spring 6, and the side magnetic path 16 to the base 2. A print head characterized in that it is provided with a screw 19 for fastening and fixing the wire guide to a base via a screw 19.