JPH0314369Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire dot printer suitable for various electronic computers, and particularly to a print head used in such a printer.

Conventional print heads for wired dot printers have multiple print heads arranged in a circle (for example, in the case of a 16-dot printer) in close contact with each other when fixing an armature connected to the back end of the wire.
If the 16 or 24 dot method is used, if the peripheral edge is fixed at a position inside the printing solenoid position 24), the ring will If it is not made of metal, it will not be possible to apply force in the direction of pressing one end of the armature against the yoke, and if the peripheral edge is fixed at a position outside the printing solenoid, the armature will be held securely. However, it has the disadvantage that the diameter of the peripheral edge becomes large.

SUMMARY OF THE INVENTION The present invention provides a novel print head for wired dot printers in which the armature regulating portion and the peripheral edge portion can be integrally molded.

The present invention will be explained below with reference to the drawings. Fig. 1 is a longitudinal sectional view of the print head of the invention, Fig. 2 is an exploded rear view of the main part, and Fig. 3 is a partially cutaway plan view. 1 is a solenoid having a core 2, a yoke 3, an armature 4 and a lead wire 5; 6 is an armature assembly having an armature presser spring storage part 7, a leg piece 8, an armature regulating part 9 and an adjustment screw hole 10; 11 is a printing wire ,12,13,1
4 is a wire guide, 15 is a wire locking piece, 16 is a wire return spring, 17 is an armature presser spring,
18 is a mounting leg planted inside the solenoid;
19 is an adjustment screw, 20 is a mounting screw, 21 is an elastic ring, and 22 is a washer.

Next, the method of assembling and adjusting the printing head of the present invention will be explained. First, a plurality of printing wires 11 are set in the wire guides 12, 13, and 14 so that they are arranged at predetermined positions. An armature presser spring 17 is installed in an armature presser spring storage portion 7 that is integrally provided on the periphery of the armature assembly 6 .
An elastic ring 22 is housed and mounted around the adjustment screw hole 10, and the armature 4 is connected to the plurality of armature guide pieces 23, 23 of the armature assembly 6.
One end of the armature 4, 4... is placed between them, and the other end of the armature 4, 4... is placed in the armature regulating section 9. In the illustrated example, since it is a 16-dot system,
They are arranged radially in an orderly manner at 22.5° intervals. In this state, the armatures 4, 4... are opposed to the predetermined cores 2, 2..., and the adjustment screws 19 are attached to the mounting portion 2.
Screw in 4. When the armatures 4, 4, . . . are then attached to the mounting legs 18, 18, . . . with the mounting screws 20, 20, the armatures 4, 4, . In FIG. 1, the spacer that is inserted between the mounting leg and the assembly and through which the mounting screw 20 passes is omitted.

Next, when power is supplied from the lead wires 5, 5, a current flows through each solenoid, and the armature 4 is attracted by the attraction action of the core 2. (Left armature in FIG. 1) As a result, the locking piece 23 provided at one end of the printing wire 11 is pushed upward in FIG. , slide on the wire guides 12, 13, and 14, and print on a predetermined paper via the ribbon at the tip of the printing wire 11.

After the printing operation is completed, when the power supply from the lead wire 5 is cut off, the suction action of the core 2 disappears, and due to the elasticity of the wire return spring 16 and the elasticity of the armature presser spring 17, the right side in FIG. Return to the state of armature 4 shown in .

Here, the stroke in the movement path of the armatures 4, 4, . . . depends on the tightening condition of the adjustment screw 19, that is, when the adjustment screw 19 is tightened, the aforementioned stroke gradually becomes smaller, and on the other hand, when the adjustment screw 19 is loosened, the aforementioned stroke becomes larger.

The force exerted by the mounting screw 20 alone is insufficient to press the peripheral edge of the armature assembly 6 against the yoke 3. Therefore, the peripheral edge part 25 receives a force in the direction of closely contacting the yoke by the legs 8, 8 arranged radially from the central armature, so that it is reliably held by the rollers. In the embodiment of the invention, the intended purpose was achieved with four leg pieces.

As described above, the print head for a wired printer of the present invention has an armature guide, a leg piece, and an armature presser spring storage part integrally provided in the armature assembly, and the assembly work requires only the armature assembly to be assembled. Place the armature and other predetermined parts on it, and then bring the back end of the printing wire into contact with one end of the armature, and then
It suffices to fix it with adjustment screws and mounting screws, which not only reduces the number of parts compared to conventional methods, but also makes it possible to reduce costs by molding the armature assembly from synthetic resin. The weight can be reduced compared to an example using metal.

Therefore, the print head of the present invention is extremely useful, especially for popular type printers such as personal computers.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a print head for a wire dot printer of the present invention, FIG. 2 is an exploded rear view of the main part of the print head, and FIG. 3 is a partially cutaway plan view. Explanation of main drawing numbers: 1 ... Solenoid, 2... Core, 3... Yoke, 4... Armature, 6 ...
Armature assembly, 7... Armature presser spring storage section, 8... Leg piece, 11... Printing wire, 1
2, 13, 14... Wire guide, 16... Wire return spring, 17... Armature presser spring, 1
9...adjustment screw.

Claims (1)

[Scope of utility model registration request] A print head for a wired printer comprising a wire guide that slidably guides a plurality of print wires and a plurality of print solenoids that selectively drive the print wires held by the wire guide. a plurality of armature guide pieces extending in the sliding direction of the armature; a leg piece whose one end is connected to the armature guide piece; and a leg piece connected to the leg piece and whose peripheral edge portion corresponds to the armature. The armature is held opposite to the core by an armature assembly integrally provided with an armature presser spring housing, and the end portion of the armature is biased by an armature presser spring stored in the armature presser spring housing. A printing head for a wire dot printer, characterized in that a center portion of the armature assembly is screwed to the wire guide by an adjustment screw, and the stroke of the wire is adjusted by tightening the adjustment screw.