JPH0626896B2 - Wire type dot printer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wire type dot printer, and more particularly to a wire type dot printer characterized by a supporting portion of a member for driving a print wire.

(Prior Art) In a wire type dot printer, it is necessary to collectively arrange a required number of print wires in a limited space so that they can be driven, so that it is usually found in Japanese Patent Publication No. 58-35475. In addition, a structure is adopted in which a plurality of drive plates having print wires attached to the inner ends thereof are radially arranged, and the outer ends thereof are pivotally clamped from above by a drive plate retainer.

For this reason, in the conventional devices, when the drive plate swings in the axial direction of the head with the outer end as a fulcrum, it also causes unnecessary movement in the surface direction, which adversely affects the printing operation such as bending the print wire. When assembled, there is a problem that it is extremely difficult to pivotally support these drive plates arranged in a plane without causing positional displacement.

(Purpose) The present invention has been made in view of the above problems, and an object of the present invention is to provide a wire-type dot printer which ensures accurate movement of a member for driving a print wire and at the same time is easy to assemble them. To do.

(Structure) That is, in order to achieve such an object, the present invention is provided with a radial slit facing the ring-shaped coil core magnetic pole and forming a swing space of the magnetic member for driving the print wire, and the driving slit. In the wire type dot printer, a plate member made of a magnetic material having a groove for receiving the shaft of the member is arranged, and members for covering the groove portion are additionally provided on the front and back surfaces of the plate member.

Therefore, details of the present invention will be described below based on illustrated embodiments.

Each of the drawings shows an embodiment of the present invention. In the drawings, reference numeral 1 is a frame having a wire nose 2 at its tip, and the inner surface of the frame is made of a magnetic material positioned on a dowel 3 and is shallow. A bottom cylindrical core block 6 is integrally fixed. The core block 6 cooperates with a bottomed cylindrical yoke 10 and a disk-shaped side yoke 12 which will be described later to suck a drive rod 15 which will be described later. For example, twelve wound cores 8 are formed to project in a ring shape, and a cylindrical portion 9 that defines the outer circumference is formed.
On the end surface of the cylindrical bottomed cylindrical yoke 10 made of a magnetic material, which is positioned by the cylindrical portion 4 protruding from the inner surface of the frame 1.
The end face of the cylindrical portion of the core abuts, and this cylindrical portion forms a constant gap between the plate surface and the top of the core 8 and is assembled so as to form a part of the magnetic path.

Reference numeral 12 is a disk-shaped side yoke made of a magnetic material, which is also positioned by the tubular portion 4 of the frame 1 and laminated on the yoke 10. The side yoke 12 forms a swing fulcrum of the drive rod 15. Twelve radial slits 1 on which the drive rod 15 can swing are formed on a plate shape slightly thinner than the diameter of the shaft 16 and on the plate surface of the yoke 10.
1 and 13 are formed (FIG. 2), and lateral grooves 14 are formed in a cross shape in the vicinity of the outer ends of the radial slits 13. By covering the bottom surface of the bottomed cylindrical yoke 10 and the ring-shaped leaf spring 19 provided on the front and back sides from above and below, the lateral groove 14 serves as the pin 16 holding portion of the drive rod 15 and above it. The pressing plate 20 is placed on the upper part and the whole is integrally assembled (FIGS. 2 and 3).

By the way, the above-mentioned drive rod 15 is for swinging with the pin 16 as a fulcrum to hit the print wire 17 fixed at the tip thereof onto the recording paper via an ink ribbon (not shown). Two ferromagnetic pieces 18, 18 are integrally attached to both side surfaces of the portion facing the core 8 to the drive rod 15 which is formed as thin as possible. At the same time as securing the working area, the eddy current loss is configured to be as small as possible by stacking the layers.
Is always urged to a non-printing position by a spring 22 interposed between the tubular portion 4 of the frame 1 and the drive rod 15, and the radial slits 11 formed on the yoke 10 and the side yokes 12, It is assembled so as to swing in the axial direction of the head while being guided by 13 and two projecting pieces 7b extending from the coil bobbin 7a fitted into the inner end portions of these slits 11, 13.

Although the basic configuration of the printer head according to the present invention is exhausted by the above description, in this embodiment, the core block 6'positioned by the dowel 21 on the pressing plate 20 and a part of the magnetic path are further configured. The bottomed cylindrical yoke 10 'and the disk-shaped side yoke 12', the twelve drive rods 15 'having the print wires 17' at the tip thereof, the pressing plate 20 'made of a resin material, etc. The printer head constituents having the same structure are arranged in a stack, and 24 print wires 17, 17 'driven by the upper and lower printer head constituents are guided to a wire guide 23 provided in the wire nose 2. And is configured to project from the sole surface 25.

In the figure, reference numerals 24 and 24 'are printed circuit boards interposed between the frame 1 and the core block 6 and between the holding plate 20 and the core block 6', and 26 is a nose fixedly positioned by the tab 5 on the frame 1. Cover, 27 is a holding plate 2
The tightening plates are shown suspended on the upper surface of the 0'and the lower surface of the nose cover 26, respectively.

Next, the assembling of the device thus configured and its operation will be described.

First, the core block 6 is positioned and mounted on the frame 1 so as to be aligned with the dowel 3, and the bottomed cylindrical yoke 10 is placed thereon.
And the disk-shaped side yoke 12 are sequentially mounted. Then, the 12 drive rods 15 are arranged from above on the radial slits 11, 1
3, the shaft 16 is fitted into the lateral groove 14 of the side yoke 12 whose lower surface is closed by the surface of the yoke 10. As a result, the twelve drive rods 15 can be mounted on the side yoke 12 by the slits 13 and the grooves 14 without causing a positional deviation. When the pressing plate 20 is placed, the shaft 16 of the drive rod 15 is clamped and fixed in the lateral groove 14 from above and below by the bottomed cylindrical yoke 10 and the plate spring 19, and the drive rod 15 is fixed to this shaft. A precise rocking movement on 16 is ensured.

Then, in the printer configured as described above, when a current is applied to the one or more drive coils 7 selected based on the print command signal, the core 8 causes the side yoke 12 and the bottomed cylindrical yoke 10 to move. Due to the magnetic flux entering the inside and the magnetic flux flowing in the side yoke 12 and the bottomed cylindrical yoke 10, the drive rod 15 has a radial slit 11,
13 and two projecting pieces 7b protruding from the coil bobbin 7a
Is rotated in the counterclockwise direction in the drawing without being horizontally swung, and the print wire 17 held at the tip is struck on the recording paper via an ink ribbon (not shown).

In the above-described embodiment, the shaft 16 of the drive rod 15 is clamped and fixed by the bottomed cylindrical yoke 10 and the leaf spring 19 from above and below to suppress the movement of the shaft 16 in the lateral groove 14. However, if the thickness of the side yoke 12 and the width of the lateral groove 14 can be accurately controlled,
The drive rod 15 and the shaft 16 can be integrally configured to facilitate the assembling.

(Effect) As described above, according to the present invention, the plate-shaped member facing the coil core is provided with the radial slits in which the drive member can swing and the shaft-supporting groove of the drive member. Since the shaft supporting groove portion is covered by the member attached to the back surface, the plate member is placed on one of the attaching members, and the driving member is positioned and fitted in the radial slit and the shaft supporting groove. Then, by covering the other additional member from the top, it is possible to easily and reliably assemble a large number of driving members without causing positional displacement, and at the same time, to the assembled driving members. It is possible to cause the print wire to perform accurate swinging motion and to perform reliable printing on the print wire.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an apparatus showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of a main portion of the same apparatus, and FIG. 3 is an exploded perspective view showing an enlarged assembly portion of a drive rod. Is. 1 ... frame, 6 ... core block 8 ... core, 10 ... bottomed cylindrical yoke 11 ... radial slit 12 ... side yoke 13 ... radial slit 14 ... lateral groove, 15 ... driving rod 17 ... Print wire 19 ... Ring-shaped leaf spring 20 ... Holding plate

Claims (1)

[Claims] 1. A radial slit forming a swinging space of a magnetic member for driving a print wire and a groove for receiving a shaft of the driving member are provided facing a magnetic pole of a coil core arranged in a ring shape. While disposing a plate-shaped member made of a magnetic material,
A wire type dot printer, wherein members for covering the groove portions are additionally provided on the front and back surfaces of the plate member.