JPS58167178A - Assembling method of printing head - Google Patents

Abstract

PURPOSE:To obtain an armature assembly in which the connection between a leaf spring and a magnetic material is strengthened, by a method wherein a printing wire is fixed to the tip of a magnetic material provided at the tip of a stretched piece, and fixing of the magnetic material and the stretched piece to each other is accomplished through diffusion bonding. CONSTITUTION:When a printing wire 26 rapidly approaches to a platen 2 and strongly strikes the platen 2 through an ink ribbon 13 and a paper 4, an ink on the ink ribbon 13 is adhered to the paper 4, thereby printing. Next, when passing of an electric current to the coil is interrupted, the free end of the wire 26 is again attracted by an attracting force of a permanent magnet, so that the wire 26 is returned to its original position. The leaf spring 28 and the magnetic material 25 are fixed to each other by diffusion bonding. By diffusion-bonding the leaf spring 28 and the magnetic material 25 to each other, both metals are mixed with each other at the bonding surface W, whereby a boundary layer between the two is eliminated, perfect contact can be achieved over the entire bonding surface, the passage of a magnetic flux coming in from the core is not prevented, and useless cambering is prevented from occurring in the leaf spring when bonding it to the magnetic material 25.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The method of assembling a print head according to the present invention relates to an armature forming body constituting a print head of a release type printer, and particularly relates to the combination of a leaf spring and a magnetic material. Concerning a fixing method that makes it strong.

(b) Technical background FIG. 1 is an overall overview of an open-release serial printer. A frame 1 supports a platen 2 so as to be rotatable around the longitudinal direction thereof, and is intermittently rotated by a motor 9 (not shown) via a gear 3. The paper 4 is set by sprockets 5a and 5b extending at both ends of the platen 2, and is fed by the rotation of the platen 2. The carrier 6Fi, the guide shaft 7, and the space motor 9 are guided by the rotating feed screw 8 via the belt 10, and are spaced toward the platen 2 in the direction of arrow A. The printing head 11 is mounted on the carrier 6, and is provided with a plurality of printing wires 26 and an electromagnetic mechanism for driving them, and the electromagnet mechanism is selectively driven in synchronization with the movement of the carrier 6. The ink ribbon 13 is housed in an ink ribbon cassette 12 and runs between the print head 11 and the paper 4.

Figure 2 is a sectional view of the printing pad 11 in Figure 1 (a
) is a side view, (b) is a top view, and (C) is an amateur side sectional view. An electromagnet created by coil excitation made up of a wound core 21 and a permanent magnet are provided in the same magnetic path, and one end of the armature 25 is held on a cantilever by supplementing the spacer 23 in the magnetic path, and the other end is held on a cantilever. The printing wire 26 is fixed to the free end side, and the free end is attracted to the core 21 by constantly bending the gear 710 by the spacer 23 by the magnetic attraction force of the sleeve permanent magnet 20.

At the time of printing, the coil 22 is energized to cut off the attractive force of the permanent magnet 20, and the armature 25 is separated from the core 21 by elastic force due to flexure.

With this operation, the printing wire 26 rapidly approaches the platen 2 and passes through the ink ribbon 13 and paper 4 to the platen 2.
When the ink ribbon 13 is struck hard, the ink from the ink ribbon 13 adheres to the paper 4, resulting in printing. Next, when the coil 22 is de-energized, the free end is again attracted to the core 21 by the attractive force of the permanent magnet 20, and the printing wire 26 returns to its original position.

(e) Prior Art and Problems FIG. 3 is a diagram showing how the leaf spring 28 and the magnetic material 25 are fixed together according to the prior art. When joining the leaf spring 28 and the magnetic material 25 (
(19) It was done by welding (a) with solder (M) as shown in the figure or (b) with spora as shown in the figure. (a) In the brazing material shown in the figure, the brazing material M blocks the passage of magnetic flux, and (bJ
Spot S welding as shown in the figure has the disadvantage that the passage of magnetic flux is obstructed by the air gap and the leaf spring 28 is deformed.

(d) Object of the invention The method of amateur assembly of a printhead according to the invention provides a means to overcome the above-mentioned drawbacks.

(e) Structure of the Invention The structure of the amateur assembly method of the printing hand according to the present invention which achieves the above object is to use a single plate spring having a plurality of pieces extending from the periphery of the circle to the center of the core. The armature member is provided with a magnetic material that is attracted to a core having a winding ring attached to the tip of each of the projecting pieces, and further has a printing wire fixed to the tip of the magnetic material.

Printing of a release type serial tod printer in which an electromagnet mechanism consisting of a permanent magnet forming a magnetic path and the core is circumferentially attached to the electromagnet mechanism together with a side magnetic path member via a spacer at a position around the leaf spring of the armature member. In the head,
The present invention is characterized in that the magnetic material fixed to the overhanging piece is fixed by diffusion bonding.(f) Embodiments of the Invention The present invention will be described below with reference to the drawings. ) Figure 4 shows an embodiment of the present invention, and is shown in Figure 9.

Components that are the same as those in Figures 2 and 3 are given the same numbers, and W is a diffusion bonding surface.3 The diffusion bonding technology between metals is a known technique used for example in joining turbine plates. 9. The magnetic material 25 is applied to the wire plate spring 28 of the present invention using the above-mentioned diffusion bonding technique. 1. (g) Effect of the invention By diffusing and bonding the plate spring and the magnetic material of the present invention, the binding effect is remarkable.

[Brief explanation of drawings]

Fig. 1 is an overall overview of a release type printer, Fig. 2 is an explanatory diagram of the configuration of the print head, Fig. 3 is a state diagram when conventional coupling is performed, and Fig. 4 is a state diagram of diffusion coupling. In the figure, 25 is a magnetic material, 26 is a printing wire, 28 is a leaf spring, and W is a bonding surface.

Claims (1)

[Claims] (1) In the print head of a release type serial dot printer in which an armature member is fixed together with a side magnetic path member via a spacer to an electromagnetic mechanism consisting of a core that includes a permanent magnet forming a magnetic path and is equipped with a winding ring, the armature member is It has a structure in which a magnetic material is provided at the tip of each of the overhanging pieces of a single-material plate spring having a plurality of pieces that overhang from the entire periphery toward the center, and a printing wire is further fixed to the tip of the magnetic material. An amateur assembly method for a print head, characterized in that the magnetic material fixed to the overhanging piece is fixed by diffusion bonding.