JPS5849192B2 - Print head for dot printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head for a dot printer that reduces the number of assembly steps by unitizing an actuator member configured such that a plurality of print wires are driven by restoring force when biasing force is removed. be.

Conventionally, the structure of this type of print head has had its main mechanical elements, such as the print wire, print wire guide, print wire drive magnet core/yoke, coil, and armature, individually installed, and the parts have been assembled in a complicated manner. It has a structure that fits together.

Therefore, it goes without saying that the number of component parts is extremely large and the number of assembly steps is required.
Many rivets, caulks, etc. are used, and the backstop assembly that prevents the printing wire from rebounding after printing is installed in the printing wire guide, printing wire guide bracket, printing wire drive magnet yoke or casing, etc. in the thrust direction of the shaft. It is attached using screws, rivets, caulking, etc. through studs to prevent it from wobbling and falling, resulting in a structure that requires a lot of assembly man-hours, which can cause breakdowns and require large-scale production equipment. It had many drawbacks, such as the need for

In order to eliminate the drawbacks of the conventional art, the present invention provides a ring-shaped structure in which a radial cutout is provided in an elastic disc body to define the annular peripheral edge and the radial piece, and a circular cutout is provided in the center. A leaf spring is provided, an armature is fixed to the tip of the radial piece, and an L is provided on the top surface.
A printed wire bent into a letter shape is provided, and the printed wire is arranged in a straight line at the bent part to form a unit body, and on the other hand, a cylindrical shape is placed on a first plate of a disc-shaped magnetic material at the center thereof. a plurality of cores to which permanent magnets are fixed and excitation coils are attached on the circumference around the axis of the permanent magnet; and a cylindrical case surrounding the plurality of coils to which the permanent magnets and excitation coils are attached. and a second plate made of a disc-shaped magnetic material is placed on the permanent magnet, and a through hole is bored in the magnetic material into which the armature of the actuator member can be inserted, thereby forming a driving member as a unit. The actuator member is placed on the drive member, the armature is inserted into the through hole, a lid is placed on the actuator member, and a wire is provided at the center of the lid. The printed wire of the actuator member is vertically projected from the guide, the lid body, the actuator member, and the drive member are fixed together, and the magnetic flux of the permanent magnet is shunted to the radial piece portion. The purpose is to unitize multiple parts to reduce the size, reduce assembly man-hours, and reduce costs.

The present invention will be explained based on the drawings.

FIG. 1 is a sectional view of the print head for a dot printer of the present invention, FIG. 2 is a plan view, FIG. 3 is a spring member, FIG. 4 is a perspective view of the second plate, and FIG. 5 is a perspective view of the operating body. shows.

In the figure, 1 is the first plate forming a common magnetic path, 2
is a cylindrical case made of non-magnetic material, 3 is a guide frame that also serves as a lid, 4 is a second plate made of magnetic material, 5 is a spacer,
6 is a permanent magnet, 7 is a core, 8 is an exciting coil, 9 is a plate spring, 10 is an armature, 11 is a printed wire, 11a
indicates a curved portion, and 12 indicates a wire guide.

Next, there is a print head for a dot printer (hereinafter referred to as head H) of the present invention.

) structure and operation. The first plate 1 is a disc-shaped magnetic material and forms a common magnetic path with the bottom plate, and the case 2 is a disc-shaped magnetic material.
It is fixed to the plate 1.

The permanent magnet 6 has a cylindrical shape and is attached to the first plate 1 inside the case 2.
is fixed at the center of the

N cores 7 equipped with excitation coils 8 are fixed in a case 2 on a first plate 1 on a circumference centered on the axis of a permanent magnet 6.

To fix the core 7 to the first plate 1, first plate 1
A hole 1-1 is provided in and the lower end 7-1 of the core 7 is inserted and fixed.

A disk-shaped second plate 4 made of magnetic material is mounted and fixed on the upper surface of the permanent magnet 6.

The second plate 4 is provided with square holes 4 a that pass through the second plate 4 at positions facing the core 7 .

The leaf spring 9 forms a thin elastic disc body. A circular plate spring 9 is provided in which a circular cutout is provided in the disc-shaped plate spring 9 to form a ring-shaped peripheral edge part 9a and a radial piece part 9b, and a circular cutout is provided in the center. , the tip 9b-1 of the radial piece 9b
An armature 10 that slightly protrudes toward the center from the tip 9b-1 of the radial piece portion 9b is fixed to the back surface.
Print wires 11 are fixed to the upper surface of the wire, bent into an L-shape in the middle, and arranged in a straight line at the bent portion 11a, with the tips facing upward.

The first plate 1, case 2, permanent magnet 6, core 7, excitation coil 8, and second plate 4 constitute the driving member D, and the leaf spring 9, armature 10, and wire spring 11 constitute the actuator member A, which serves as a unit. do.

A ring-shaped spacer 5 is placed on the top surface of the case 2, a second plate 4 is placed on the permanent magnet 6 provided at the center of the first plate 1, and an armature 10 is inserted into the square hole 4a of the second plate 4. In addition, the ring-shaped peripheral edge 9a of the plate spring 9 is placed on the spacer 5, the guide frame 3 is placed on the ring-shaped peripheral edge 9a, and the wire guide 1 is provided at the center of the guide frame 3.
2, the print wire 11 is vertically projected upward.

When the excitation coil 8 is not excited, the magnetic flux of the permanent magnet 6 creates a loop magnetic path passing through the first plate 1, core 7, armature 10, and second plate 4, so the armature 10 is attracted to the core 7, and the leaf spring All of the 9 radial pieces 9b are biased toward the core 7.

Next, when the necessary excitation coil 8 is excited, the excitation coil 8
The magnetic flux based on the magnetic field generated shifts the direction of the magnetic flux of the permanent magnet 6, and the magnetic flux of the permanent magnet 6 is removed from the attraction part of the armature 10, and the magnetic flux of the permanent magnet 6 is removed from the core 7 corresponding to the excited excitation coil 8 to the armature 10. is released by the restoring force of the radial piece 9b of the biased plate spring 9, drives the print wire 11 fixed to the armature 10, and prints dots at the tip of the wire 11 to the print 1.

When the excitation of the excitation coil 8 is cut off, the core 7 becomes the armature 10.
, and the permanent magnet 6 holds the armature in a state where the radial piece portion 9b is biased.

As explained above, the present invention can unitize the actuator member and the drive member, which consist of a ring-shaped plate, an armature, and a printed wire, so that the number of assembly steps can be greatly reduced, the assembly structure is simple, and a small size can be easily constructed. .

This produces effects such as cost reduction.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a cross-sectional view of the printer print head of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a partially cutaway perspective view of the actuator member of the present invention. , FIG. 4 is a perspective view of the second plate of the present invention, and FIG. 5 is a partially cutaway perspective view of the drive member of the present invention with the second plate removed. D: Drive member, A: Actuator member, 1: First plate, 2: Cylindrical case, 3: Guide frame, 4:
2nd plate, 5: spacer, 6: permanent magnet, 7: core, 8: excitation coil, 9: plate spring, 9a: radial piece, 10
: Printed wire, 11: Wire guide.

Claims (1)

[Claims] 1. An elastic disk body is provided with a radial cutout to constitute a ring-shaped peripheral edge and a radial piece, and a ring-shaped leaf spring with a circular cutout in the center is provided, and the radial cutout of the radial piece is an actuate member having an armature fixed to its tip and a printed wire bent into an L-shape on the upper surface, and arranging the printed wires in a straight line at the bent part to form a unit;
A plurality of cores each having a cylindrical permanent magnet fixed to the center thereof and an excitation coil mounted on a circumference centered on the axis of the permanent magnet on a first plate made of a disk-shaped magnetic material; A cylindrical case is fixed to the outer periphery of a plurality of coils equipped with magnets and excitation coils, and a second plate of a disc-shaped magnetic material is placed on the permanent magnet, and the actuator member is attached to the magnetic material. A driving member is formed as a unit by drilling a through hole into which an armature can be inserted, and the actuating member is placed on the driving member, the armature is inserted into the through hole, and the actuating member is placed on the actuating member. A lid is placed, and the printed wire of the actuator member is vertically protruded from a wire guide provided in the center of the lid, the lid, the actuator member, and the drive member are fixed together, and the magnetic flux of the permanent magnet is A print head for a dot printer, characterized in that the print head is configured to shunt to the radial piece portion.