JPH0369373A - Printing head - Google Patents

Abstract

PURPOSE:To use two types of reference pitches properly by a method wherein a wire guide provided with through holes vertically arranged at two types of reference pitches, i.e. A inches and B inches, is mounted on a printing head for driving n-pieces of wires. CONSTITUTION:On the tip end of a head frame 14, a wire guide 9 provided with through holes 21 is provided. A tip end part 2a of a wire 2 is inserted to the through hole 21 to be held. The through holes are divided into two groups of two different reference pitches: a first through hole group 7 has a vertical reference pitch A of 1/160 inches and a second through hole group 8 has a vertical reference pitch B of 1/180 inches. When a selector switch 17 is set to a connecting position S1, an electric current flowing to an electric current supply pattern 18 flows to a coil 6 corresponding to a wire 2 held by the first through hole group 7. The tip end part 2a of the wire 2 moves along the through hole 21 to impact against a printing surface. When the selector switch 17 is set to a connecting position S2, the current flows to a coil 6 corresponding to a wire 2 held by the second through hole group 8, and the wire acts similarly to the above action. As a result, two types of reference pitches can be properly used in a single printing head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print head for a dot matrix printer that prints by selectively impacting a recording medium with a print wire.

[Prior Art] Conventionally, this type of print head has 24 electromagnetic actuators arranged in an annular shape, which are formed by a yoke, an armature, and a coil.By energizing the coil, the armature is drawn toward the yoke, and the armature is moved toward the yoke. A wire connected to the tip of the wire is advanced, and printing is performed using the tip of the wire. This wire is inserted and held through the 24 through holes of a wire guide, which has 24 through holes arranged in a staggered manner with a vertical reference pitch of 1/160 inch or 1/180 inch, and is guided thereby. There is. The wire guides having through holes having the two types of standard pitches were provided in separate print heads.

[Problems to be Solved by the Invention] However, in the conventional print head described above, the wire guide disposed at the tip of the wire has a vertical reference pitch of 24 through holes of 1/160 inch. Or 1/18
Since only one of the 0 inches is provided, the above 2
In order to print according to different standard pitches, there are two types of printers: one equipped with a print head that uses a wire guide with a standard pitch of 1/160 inch, and the other with a print head that uses a wire guide with a standard pitch of 1/180 inch. The drawback is that a separate printer must be prepared and used separately.

[Means for Solving the Problems] The technical means of the present invention for solving these problems are as follows: (1) An armature that is driven by excitation of a coil provided in a yoke and arranged in an annular shape. a plurality of electromagnetic actuators, a wire connected to each armature and moved forward and backward by the drive of the armature, the end face of the tip facing the printing surface, an intermediate guide that holds the intermediate part of the wire, and the intermediate guide. and a print head comprising a head frame that holds the yoke, and a wire guide provided in the head frame and formed with a through hole through which the tip of the wire is inserted and held, an electromagnetic actuator and an armature of the electromagnetic actuator. each wire
In addition, the wire guide includes a first hole group consisting of 34n holes arranged in a row with a vertical reference pitch of A inches, and a B hole group with a vertical reference pitch different from the first hole group. A second through hole group consisting of 34n through holes arranged in a row in inches is provided.

(2) A plurality of electromagnetic actuators arranged in an annular shape each having an armature that is driven by the excitation of a coil provided in the yoke, and a plurality of electromagnetic actuators that are joined to each armature and move forward and backward by the drive of the armature to move the tip end. A wire whose end face faces the printing surface, an intermediate guide that holds the intermediate portion of the wire, a head frame that holds the intermediate guide and the yoke, and a passage provided in the head frame that inserts and holds the tip of the wire. An electromagnetic actuator and a wire connected to an armature of the electromagnetic actuator are each connected to an electromagnetic actuator and a wire guide having a hole formed therein.
In addition, the wire guide has a first hole group consisting of n holes arranged in a row with a vertical reference pitch of A inch, and a wire guide with a vertical reference pitch of A inch different from the first hole group. A second through hole group consisting of n through holes arranged in a row in inches is provided in each of the n electromagnetic actuator coils.
N coil patterns connected and supplied with current and n current supply patterns connected to a connector supplying current are provided, and an area corresponding to the wires inserted and held in the first through hole group is provided. A first connection position that connects the n coil patterns and the 4n current supply patterns, respectively, and areas corresponding to the wires inserted and held in the second through hole group and the area n. A switching circuit is provided for switching to one of the second connection positions for connecting the respective current supply patterns.

[Example] Hereinafter, a print head according to an example of the present invention will be described based on the accompanying drawings.

As shown in FIG. 1, the print head according to the embodiment includes an armature 1 driven by excitation of a coil 6 provided on a yoke 5, and a plurality of electromagnetic actuators 20 arranged in an annular shape. .

In this electromagnetic actuator 20, the armature 1
has a wire 2 connected and held at one end, and the other end is supported by a stopper plate 3 via a hold spring 4. The hold spring 4 is held in the inner circle of the ring of the stopper plate 3 and is formed into an arm shape extending radially around the outer circumference, and functions as a leaf spring. And armature 1
is pressed against the upper surface of the outer columnar portion 5a of the yoke 5 by the end of the skewer-ruby spring 4 to form a fulcrum. A coil 6 is attached to the inner columnar part 5b of the yoke 5, and the outer columnar part 5a, bottom part 5c, and inner columnar part 5b of the yoke 5 form a U-shaped recess, on which the armature 1 is arranged. Furthermore, the number of wires 2 connected to the electromagnetic actuator 20 and the armature 1 of the electromagnetic actuator 20 is 48 each.

Further, the wire 2 is joined to each armature 1 so that its tip 2a extends toward the yoke 5, and its tip 2a extends toward the yoke 5.
Its end face faces the printing surface, and is moved forward and backward by driving the armature 1. This wire 2 has intermediate guides 10, 11, 12, 13 in its middle part.
is held in Furthermore, the above-mentioned yoke 5. The intermediate guide 10°11.12.13 is held by the head frame 14.

A wire guide 9 is provided at the tip of the head frame 14 and has a through hole 21 through which the tip 2a of the wire 2 is inserted and held. This wire guide 9 has a second
As shown in the figure, the first through hole group 7 consists of 24 through holes 21 arranged in two rows in a staggered manner with a vertical standard pitch A of 1/160 inch, and a vertical standard pitch B of 17180 inches. A second through hole group 8 consisting of 24 through holes 21 arranged in two rows in a staggered manner in inches is provided with two types of through hole groups having standard pitches. The wire guide 9 is installed in a head frame 14 that holds the yoke 5 and intermediate guides 10, 11, and 12 degrees 13 at a position that holds the tip of the wire 2 on the side opposite to the armature 1.

Further, in this print head, as shown in FIG. 3, 48 coil patterns 2 are connected to the coils 6 of the 48 electromagnetic actuators 20 and supplied with current.
2.23 and 2 connected to the connector that supplies the current
Four current supply patterns 18 are provided. Furthermore, in the print head, 24 coil patterns 22 corresponding to the wires 2 inserted and held in the first through hole group 7 are formed.
and the 24 coil patterns 2 corresponding to the wires 2 inserted and held through the first connection position S1 and the second through hole group 8 that connect the 24 current supply patterns 18 and the 24 current supply patterns 18, respectively.
A changeover switch 17 is provided as a switching circuit for switching to one of the second connection positions S2 that connects the current supply patterns 3 and the 24 current supply patterns 18, respectively.

That is, the coil pattern 2 provided in 48 coils 6
Terminals 15 leading to 2.23 are soldered to the board 16. For soldering, a changeover switch 17 is provided in the middle of the 48 coil patterns 22 and 23 of the coil 6 drawn from the part, and this changeover switch 17 connects the connector insertion part 16a.
Twenty-four current supply patterns 18 are connected to each other. The substrate 16 is placed on the opposite side of the coil 6 across the bottom 5c of the yoke. Then, the current from the print head driver flowing to the current supply pattern 18 on the connector insertion side is switched to the -th connection value rIIS1 or the second connection position S2 by the changeover switch 17. At the first connection position S1, the coil pattern 22 corresponds to the wire 2 passing through the first hole group 7 whose reference pitch in the wire guide 9 is set to 1/160 inch.
The current supply pattern 18 is connected to the second connection position S2.
In this case, the current supply pattern 18 is connected to the coil pattern 23 corresponding to the wire 2 passing through the second hole group 8 whose reference pitch is set to 1/180 inch.

The operation of the print head configured as described above is as follows.

First, move the changeover switch 17 on the board 16 to the first connection position S1.
To explain the case where the current supply pattern 18
The current flowing into the coil 6 of the magnetic circuit corresponding to the wire 2 held in the first hole group 7 of the wire guide 9 with a vertical reference pitch of 1/160 inch, and the current flowing into the coil 6 of the magnetic circuit corresponding to the wire 2 held in the first hole group 7 of the wire guide 9 with a vertical reference pitch of 1/160 inch, The suction force of yoke 5 increases, and armature 1
direction, and the tip end 2a of the wire 2 moves toward the wire guide 9.
It moves along the through hole 21 and collides with the printing surface. When the current application is stopped, the wire 2 is pushed back by the repulsive force from the printed surface, collides with the stopper plate 3, and comes to rest. Next, when the changeover switch 17 is set to the second connection position S2, the current supply is stopped. The current flowing into the pattern 18 has a vertical reference pitch of 1/180 of the wire guide 9.
The current flows through the coil 6 of the magnetic circuit corresponding to the wire 2 held in the second hole group 8 of the inch, and performs the same operation as described above.

[Effects of the Invention] As explained above, according to the print head of the present invention, one wire-driven print head has holes with two types of vertical reference pitches, A inch and B inch. By providing a wire guide, printer equipment or
It becomes possible to selectively use two types of reference pitches with one printer device and print head without replacing the print head. Furthermore, when switching between a magnetic circuit corresponding to the vertical reference pitch of the wire guide of A inch and a magnetic circuit corresponding to B inch, the coil side is provided with n coil patterns, while the connector side is provided with 24 current supply patterns. When switching is performed using a switching circuit, the number of drivers for operating each magnetic circuit of the print head can be reduced from n to 1/2n, reducing the number of parts to 9.
This has the effect of reducing assembly man-hours.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing a print head according to an embodiment of the present invention, FIG. 2 is a front view showing the arrangement of through holes in a wire guide according to an embodiment, and FIG. 3 is a switching circuit according to an embodiment. FIG. 1: Armature 2: Wire 5: Yoke 6: Coil 7; First hole group 8: Second hole group 9: Wire guide 10.1'L, 12, 13: Intermediate guide 14: Head frame 17: Selector switch 18: Current supply pattern 20: Electromagnetic actuator 21: Through hole 22.23: Coil pattern

Claims (2)

[Claims] (1) A plurality of electromagnetic actuators are arranged in an annular shape and have an armature that is driven by the excitation of a coil provided in a yoke, and the end face of the tip is connected to each armature and moves forward and backward by the drive of the armature. A wire facing the printing surface, an intermediate guide holding the intermediate part of the wire, a head frame holding the intermediate guide and the yoke, and a through hole provided in the head frame through which the tip of the wire is inserted and held. An electromagnetic actuator and a wire connected to an armature of the electromagnetic actuator are each connected to an electromagnetic actuator and an armature of the electromagnetic actuator.
In addition, the wire guide has a first through hole group consisting of 1/2n through holes arranged in a row with a vertical reference pitch of A inch, and a first through hole group with a vertical reference pitch of A inch. different B
and a second through hole group consisting of 1/2n through holes arranged in a row in inches. (2) A plurality of electromagnetic actuators arranged in an annular shape each having an armature that is driven by the excitation of a coil provided in the yoke, and a plurality of electromagnetic actuators that are joined to each armature and move forward and backward by the drive of the armature, so that the end surface of the tip part A wire facing the printing surface, an intermediate guide holding the intermediate part of the wire, a head frame holding the intermediate guide and the yoke, and a through hole provided in the head frame through which the tip of the wire is inserted and held. An electromagnetic actuator and a wire connected to an armature of the electromagnetic actuator are each connected to an electromagnetic actuator and an armature of the electromagnetic actuator.
In addition, the wire guide has a first hole group consisting of 1/2n holes arranged in a row with a vertical reference pitch of A inch, and a vertical reference pitch different from the first hole group. A second through hole group consisting of 1/2n through holes arranged in a row with B inches, and n coil patterns and currents connected to the coils of the n electromagnetic actuators respectively and supplied with current. 1/2n current supply patterns connected to the connector that supplies 1/2n coil patterns and the 1/2n current supply patterns corresponding to the wires inserted and held in the first connection position and the second through hole group respectively connecting the current supply patterns. A print head characterized in that it is provided with a switching circuit for switching to any one of the second connection positions.