JPH06238918A - Wire dot printer head - Google Patents

Abstract

PURPOSE:To provide a wire dot printer wherein at the time of grinding of the tip of a wire at the time of assembly of a wire dot printer head, ground chips between a grindstone and a wire guide are hard to generate clogging to the wire guide part and grindstone itself and smooth ribbon feed and both side movements of a head part are possible. CONSTITUTION:In a wire dot printer head performing printing by hitting a ribbon 6 with a wire 7, a wire guide part 33 guiding the tip of the wire 7 performing reciprocation printing by corresponding to a rotation of an armature 4 is provided on the surface of a head base 32 in a projected state integrally. Therefore, since contact between the ribbon 6 and head base 32 becomes only the tip surface of the wire guide part, frictional resistance at the time of ribbon feed is mitigated, smooth ribbon feed can be performed and grinding of the wire 7 and wire guide part 33 is performed easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire dot printer head for printing with electromagnetic energy.

[0002]

2. Description of the Related Art In recent years, wire dot printers for printing with electromagnetic energy have been widely used because of high quality printing and low price. Conventionally, a wire dot printer head generally has a structure as shown in FIG. The configuration will be described below with reference to FIG.

The yoke 1 is an exciting member that is excited by the coil 2 and is fixed to the head base 3. The armature 4 is rotatably held in the AB direction by an amateur guide 5, and a wire 7 for striking the ribbon 6 on the other end side of the center of rotation of the amateur 4 for printing is held by the head base 3 slidably in the CD direction. There is. The wire 7 is biased in the D direction by the return spring 8 to bias the armature 4 in the D direction. An armature stopper 9 for positioning the armature 4 at a stationary position is provided on the opposite side of the wire 7 and the return spring 8, and is fixed to the head base 3 by a screw 35 together with the armature guide 5 by the cover 10.

In the above structure, when the coil 2 is energized, the armature 4 is attracted by the yoke 1 and rotates in the A direction. Then, the wire 7 is pushed by the armature 4, slides in the direction C along the wire guide portion 11, hits the ribbon 6, and prints.

[0005]

In such a conventional wire dot printer head, since the wire guide portion 11 is inside the head base 3, the end portions of the wire guide portion 11 and the head base 3 are the same at the tip of the wire 7. It will be on a plane. Therefore, when polishing the tip of the wire 7 when assembling the wire dot printer head, not only the tip of the wire 7 but also the wire guide portion 11 is ground with a grindstone.
The surface of the wire guide portion 11 was scraped over a wide range,
There is a problem that the grindstone and the polishing debris of the wire guide portion 11 cause clogging in the wire guide portion 11, and the print quality, which is the basic quality of the wire dot printer, is likely to be impaired. Further, since the ribbon 6 and the head base 3 are in contact with each other over the entire width of the ribbon, there is a problem that frictional resistance at the time of feeding the ribbon is increased, and smooth ribbon feeding and bidirectional movement of the head portion are likely to be hindered. there were.

Therefore, it is an object of the present invention to provide a wire dot printer head which can solve the problems of the conventional ones.

[0007]

To this end, according to the present invention, a wire guide portion for guiding the tip of a wire for reciprocating printing according to the rotation of an amateur is integrally provided on the surface of a head base. Is.

[0008]

According to the present invention, the above-described structure facilitates wire polishing work without causing clogging, and since the contact between the ribbon and the head base is made only at the tip end surface of the wire guide portion, the friction resistance during ribbon feeding is increased. Is reduced, smooth ribbon feeding and bidirectional movement of the head can be performed, and printing quality can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a small printing device which is a portable check issuing machine provided with a wire dot printer head according to the present invention. . Body case 14 and case lid 1
5 is openably and closably coupled via a hinge 16. The wire dot printer head 1 is provided on the inner surface of the main body case 14.
2 is provided so as to be exposed on the case lid 15 side. A flat platen 17, a fixing claw 18 for the flat platen 17, and a leaf spring 19 for urging the flat platen 17 toward the wire dot printer head 12 are provided at a position of the case lid 15 facing the wire dot printer head 12. ing. Reference numeral 13 is a protrusion provided on the side of the wire dot printer head 12, and a certain head gap is secured by contacting the surface of the plane platen 17.
Reference numeral 20 is a positioning claw for positioning a standard paper such as a check, and 21 is an opening / closing lever.

FIG. 2 is a perspective view of the printing section. 22 is a ribbon cassette containing a fibrous ribbon 6 containing ink,
23 is a shaft that penetrates the wire dot printer head 12, 24 is a paper feed roller, 25 is a DC motor, 2
6 is an encoder attached to one shaft of the DC motor 25, 27 is a photo sensor, 29 is a cylindrical cam, and a groove 29a is provided on its peripheral surface. 31 is a balancer. The protrusion (not shown) provided on the wire dot printer head 12 and the protrusion (not shown) provided on the balancer 31 are engaged with the groove 29a at positions opposite to each other. 28 is a gear box for transmitting power to the cylindrical cam 29, 30 is a gear train for transmitting power of the cylindrical cam 29 to the ribbon 6, and 34 is a ribbon driving shaft.

FIG. 3 shows a wire dot printer head 12
Is a perspective view and FIG. 5 is a sectional view thereof. Reference numeral 32 is a head base of the wire dot printer head 12. Reference numeral 33 is a wire guide portion integrally provided on the head base 32. The wire guide portion 33 has a tapered conical shape, and is provided in a spot-like manner on the surface of the head base 32 on the printing surface side. The wire guide portion 33 guides the wire 7 for reciprocating printing by the rotation of the armature 4 at the tip portion of the head base 32.

Next, the polishing of the tip of the wire when assembling the wire dot printer head will be described with reference to FIGS. 4 and 5. 4 and 5, the same components as those of the conventional component shown in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted. All the wires 7 are inserted one by one along the wire guide portion 33 into the wire dot printer head 12 fixed by the jig. At this point,
As shown in FIG. 5, an extra tip portion of the wire 7 projects from the tip of the wire guide portion 33. Next, the tip end of the wire 7 is ground together with the wire guide portion 33 using the grindstone 40, and the required reach distance at the time of printing the wire 7 is set to all the wire 7
Adjust so that they are equal. By thus forming the wire guide portion 33 into a conical shape, polishing with the grindstone 40 is facilitated, and the area of the tip end surface which is a contact surface with the ribbon 6 is reduced, so that the ribbon 6 and the head portion at the time of feeding the ribbon are reduced. The frictional resistance of can be reduced. From this point of view,
It is desirable that the width of the tip end surface of the wire guide portion 33 be substantially equal to or smaller than the width of the ribbon 6.

[0013]

As described above, according to the present invention, the contact between the ribbon and the head base is made only at the tip end surface of the wire guide portion, so that the frictional resistance between the ribbon and the head portion at the time of feeding the ribbon is reduced and smooth. The ribbon can be fed easily and the head part can be moved bidirectionally, and high-quality printing can be realized.
Further, the polishing of the wire and the wire guide portion can be easily performed without causing clogging of the wire guide portion and the grindstone.

[Brief description of drawings]

FIG. 1 is a perspective view of a portable check issuing machine including a wire dot printer head according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a printing unit of a wire dot printer head according to an embodiment of the present invention.

FIG. 3 is a perspective view of a wire dot printer head according to an embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view of the wire dot printer head according to the embodiment of the present invention.

FIG. 5 is a sectional view of a wire dot printer head according to an embodiment of the present invention.

FIG. 6 is a sectional view of a conventional wire dot printer head.

[Explanation of symbols]

 1 yoke 2 coil 4 armature 6 ribbon 7 wire 8 return spring 12 wire dot printer head 32 head base 33 wire guide section

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akihiro Nishiyama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. An armature, a yoke, a coil for exciting the yoke, a head base provided with the armature, the yoke and the coil, and a printing wire provided on the other end side of the center of rotation of the armature. A wire dot printer head comprising: a wire guide portion that guides the tip of the wire for reciprocating printing according to the rotation of the amateur, integrally protruding from the surface of the head base. Characteristic wire dot printer head.