JPS62124959A - Separation/combination of two parts of printer head - Google Patents

Abstract

PURPOSE:To enable a driven part and a driving part to be easily separated and combined and reduce the manufacturing cost of a printer head by using a screw hole on the driven part as a screw hole of screws for separation/ combination of the driven and driving parts. CONSTITUTION:In a driven part, a disc-shaped yoke 3 of magnetic substance and an annular ring member 4 of magnetic substance are screwed to each other with a screw 7. When separating the driving part 1 from the driving part 2, first any three pieces of screw 7 positioned to each other at 120 degrees' pitch from among those set at a prearranged interval on the external circumferential part of the yoke 3 should be removed. Next a screw 25 having a longer under-head length than the depth of a screw hole from which the removed screw is driven into each screw hole corresponding to the removed screw 7. This allows the tip of the screw 25 to contact a permanent magnet 13 on the driving part 2 side. In addition, the driven part 1 can be easily separated from the driving part 2, resisting the attractive force of the permanent magnet 13 by driving the screw 25.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for separating and combining both parts of a printer head for a wire dot printer having a driven part and a drive part.

<Prior Art> In general, a printer head for a Wire A7 dot printer is comprised of a trian portion that guides a printing wire fixed to the free end of an armature, and a drive portion that drives the armature. In the manufacturing process of such a printer head, once assembled, the printer head must be separated and assembled again for adjustment.

However, since the driven part is attracted by the attractive force of the permanent magnet on the drive part side, and the driven part and the drive part are positioned by pins and pin holes, it is easy to separate and combine the driven part and the drive part. It wasn't.

Therefore, when assembling both parts of the Torium part, for example, three screw holes are provided that penetrate in the direction, and screws with a relatively long length under the neck are screwed into these screw holes, thereby connecting the driven part and the drive part. Utility Model Application No. 58-89342 proposes to facilitate separation and combination.

However, although it is sufficient to provide at least three screw holes for separation at equal intervals on the circumference, providing new screw holes only for separation and combination may cause an increase in manufacturing cost.

<Problems to be solved by the invention> In view of these conventional problems, the main purpose of the present invention is to
It is an object of the present invention to provide a method for separating and combining two parts of a printer head, which facilitates separation and combination of a driven part and a drive part, and which can reduce the manufacturing cost of a printer head for a wire dot printer.

Means for Solving the Problems According to the invention, the invention provides a driven part having an armature supported at one end of a spring and a printing wire fixed to the cough armature; a drive part having a permanent magnet that biases in one direction and an electromagnet that can be excited to cancel the biasing force of the permanent magnet, and the driven part is arranged in the direction in which the two parts are assembled. Separation of the two parts in a printer head in which the two parts are assembled by a plurality of screws screwed into a plurality of screw holes passing through the printer head, and the two parts are attracted to each other by the attractive force of the permanent magnet. The combining method includes a step of removing at least a part of the screw that assembles the driven part, and a step of removing at least a part of the screw into the screw hole from which the screw is removed.
This is achieved by providing a method for separating and combining two parts of a printer head, which comprises the step of screwing together a screw having a longer length under the neck than the screw hole.

<Function> In this way, a part of the screw that assembles the driven part is removed, and in its place, a screw having a longer length under the neck than the screw hole from which the screw was removed is inserted. By screwing into the screw hole, the driven portion and the drive portion can be easily separated and combined.

<Embodiments> Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a partially cut away printer head according to the present invention.
and a drive part 2.

In the trian part 1, a disk-shaped yoke 3 made of a magnetic material and an annular ring member 4 made of a magnetic material are screwed together by screws 7 so as to sandwich a leaf spring 6 through a spacer 5. An armature 8 is supported at the free end of the temporary spring 6. The leaf spring 6 has a W end portion integrally formed in an annular shape, and a free end portion thereof is divided into the same number of parts as the armature 8.

An integrally formed arm 9 extends from the radially inner end of the armature 8, and a proximal end of a printing wire 10 is fixed to the free end of the arm 9.

The printing wire 10 passes through the inside of the bed nose 12 fixed to the yoke 3, and its tip reaches the free end surface 12a of the helad nose.

Further, in the drive portion 2, the annular permanent magnet 13 and the heat dissipation member 14 are connected to an annular ring member 15 made of a magnetic material.
A required number of cores 16a are inserted at intervals of S: in the circumferential direction.
A core member 16 made of a magnetic material having .

A solenoid 17 is wound around each of the cores 16a, and the solenoid 17 is electrically connected to the board 20 via a terminal 18.

In the printer head configured in this manner, the armature 8 is placed at a predetermined distance from the free end surface of the core 16a, so when the solenoid 17 is not excited, the armature 8 is a permanent magnet. The core 16a is urged toward the free end side by the suction force of the core 16a. At this time, the solenoid 1 is oriented in a direction that cancels out the effect of the permanent magnet 13.
When the armature 7 is excited, the armature 8 is elastically separated from the free end surface of the core 16a due to the restoring force of the leaf spring 6.

At this time, the printing wire 10 fixed to the armature 8 via the arm 9 projects from the free end surface 12a of the helad nose 12 and hits the ink ribbon (not shown) and the paper surface to perform the desired printing.

Next, the procedure for separating and combining the printer heads in the present invention will be described.

When separating the drive part 2 from the drive part 2, first screw any three screws 7 provided at predetermined intervals on the outer circumference of the yoke 3, which are located at 120 degrees apart from each other.
Remove the book. Next, screws 25 having a length under the head longer than the screw hole of the removed screw 7 are screwed into the screw holes corresponding to the removed screws 7. It is brought into contact with the permanent magnet 13. By further screwing in the screw 25, the driven part 1 can be easily separated from the drive part 2 against the attractive force of the permanent magnet 13.

Furthermore, as clearly shown in Fig. 2, the torian part 1
is a pin hole 2 cut at a predetermined position on the outer peripheral surface of the yoke 3.
6 and the pin 27, the drive portion 2
is positioned. Therefore, when separating the driven part 1 from the drive part 2, the pin 27 and the pin hole 26
It must be ensured that the respective axes of the two do not shift and interlock with each other. Therefore, the above-mentioned mutual
Screws 25 screwed into three arbitrary locations located at 20 degree intervals
By averaging each and screwing in, the torian part 1
Since the pin 27 can be pulled away from the drive portion 2 without tilting, it is possible to avoid engagement between the pin 27 and the pin hole 26.

Note that since the leaf spring 6 is integrally formed in an annular shape, the armature 8 will not be separated even if any screw 7 is removed, and there will be no problem in removing some of the screws.

Further, when the driven part 1 and the drive part 2 are combined, the pin 27 and the pin hole 26 are aligned and then engaged, but the tip of the screw 25 is connected to the drive part 2 of the driven part 1. Since the driven part 1 and the drive part 2 are not firmly attracted by the attraction force of the permanent magnet 13, the pin 27 and the pin hole 2
6 can be easily matched. Then, by untwisting each screw 25 evenly, the pin 27
The driven portion 1 and the drive portion 2 can be combined without causing any meshing with the pin hole 26.

<Effects of the Invention> As described above, according to the present invention, by using the screw hole of the driven part as the screw hole for separating and combining the driven part and the drive part, Since there is no need to provide a screw hole, an increase in the manufacturing cost of the printer head can be avoided.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a printer head according to the present invention. FIG. 2 is a front view of a printer head based on the present invention. 1... Driven part 2... Drive part 3...
・Yoke 4... Ring member 5... Spacer 6... Leaf spring 7... Screw 8
...Armature 9...Arm 10...
・Printing wire 12...Head nose 12a...Free end surface 13...Permanent magnet 14...Heat radiation member 15
...Ring member 16...Core member 16a...
Core 17... Solenoid 18... Terminal
20... Board 25... Screw 26.
...Pin hole 27...Pin

Claims (1)

What is claimed is: a driven portion having an armature supported at one end of a spring and a printing wire fixed to the armature;
a drive portion having a permanent magnet that biases the armature in one direction and an electromagnet that can be excited to cancel the biasing force of the permanent magnet; Separation of the two parts in a printer head in which the two parts are assembled by a plurality of screws screwed into a plurality of screw holes passing through the printer head, and the two parts are attracted to each other by the attractive force of the permanent magnet. The method includes the steps of: removing at least a portion of the screws that assemble the driven portion; and inserting a screw having a length under the head longer than the screw hole into the screw hole from which the screw was removed. A method for separating and combining two parts of a printer head, the method comprising the step of combining two parts of a printer head.