JPS63317353A - Impact dot head - Google Patents

Abstract

PURPOSE:To obtain satisfactory printing alignment, eliminate the interference by a hole which guides printing wire for a wire guide and enable proper guidance by the wire guide by allowing mixed existence of a group of printing wires, some being arranged straight and the other in a curved form, proceeding toward an opposite end of a platen from an end when said wires are arranged on a periphery. CONSTITUTION:Printing wire is retained by a group of wire guides 3 and a wire guide A5, and the wire guide A5 is fixed to a nose 6 through engagement with a wire nose 4. The rear end of the printing wire 1 is arranged on a periphery and its tip on a straight line. The printing wire 1 consists of printing wires A#, B#, C# arranged in a curved form, and other wires in a linear form. A drive lever 2 rotates clockwise centering around a fulcrum shaft 12 resisting a return spring 14 and consequently, moves the printing wire 1 installed on the tip of the lever to an arrow (a) direction. This results in the hammering of the printing wire on printing paper through ink ribbon to perform printing. Since the printing wires A# and C# are arranged in a curved form, the interference by holes for A# and C# of the wire guide group 3 which guides printing wire does not occur, and the printing wire can be properly guided to provide with quality print.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wire-type dot printer, and more particularly to the arrangement of printing wires in an impact dot head.

[Conventional technology]

Conventionally, a group of printing wires was arranged in a straight line from one end face disposed on the circumference to the other end facing the platen, or all the printing wires were arranged in a straight line, or all the printing wires were arranged with bent arms. It was one or the other.

[Problem that the invention seeks to solve]

However, when all the printing wires were arranged in a straight line in this way, printing wires with large inclination angles had different printing positions 2 due to changes in the distance between the printing wires and the platen, resulting in poor printing alignment. Furthermore, since each printing wire is close to each other, the wire guide hole for guiding the printing wire interferes with each other, making it impossible to guide the printing wire appropriately.

On the other hand, if all printing wires are arranged with bent arms, the lateral pressure applied to the printing wires will be large, and the drive unit must be made larger to obtain responsiveness. A special jig was required.

The present invention was made to solve the above problems, and
The purpose of this is to obtain good printing alignment and to avoid interference with the hole in the wire guide that guides the printing wire, allowing for appropriate guidance.

[Means for solving problems]

The present invention has been made to achieve the above object, and includes a part of a printing wire whose end face facing a platen is arranged on a straight line and the other end is arranged on a circumference, and a part of the printing wire that holds the printing wire. A wire dot printer comprising a wire guide and an electromagnetic drive unit that drives the printing wires, in which the group of printing wires are arranged in a straight line from an end surface disposed on a circumference toward the other end facing the platen; To provide an impact dot head having a combination of a dot head with bent arms and a dot head with bent arms.

〔Example〕

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. A printing wire 1 is held by a wire guide group 3 and a wire guide A5, and the wire guide A5 is engaged with the wire nose 4 and fixed to the nose 6. Further, a shallow cylindrical core block 7 made of a magnetic material and positioned on the wire nose 4 is integrally fixed. This core block 7 cooperates with a cylindrical yoke 8 and a disc-shaped side yoke 9 to attract a drive lever 2, which will be described later.A coil 10 is wound around the inner surface of the core block 7. A protruding core 11 is formed into a ring shape and assembled to form part of a magnetic path.

The above-mentioned drive lever 2 swings around the fulcrum shaft 12 to hit the printing wire l fixed at its tip onto the printing paper between the ink ribbon and the platen 17 (not shown). be. Furthermore, this drive lever 2 is always pressed by a return spring 14 interposed between the zero-bar part 13 of the wire nose 4 and the drive lever 2, and is held at a standby position by a lever holder 16 having a damper 15. It is assembled into.

Figure 2 shows the printing wire (1) seen from the direction of the arrow in Figure 1.
) is a diagram schematically showing a portion corresponding to approximately one-fourth of the group, and as mentioned earlier, the rear ends of the printing wires 1 are arranged on the circumference and the tips are arranged on a straight line.

As shown in the figure, the printing wires 1 are printing wires A#,
B# and C# are arranged in a bent manner, and the other printing wires are arranged in a straight line. In the figure, the printing wire A# is arranged in a bent direction from an end surface A^ disposed on the circumference toward an end surface Aa facing the platen, and a side view thereof is shown in FIG. Further, in FIG. 2, the printing wheel B# is also arranged in a curved manner from the end surface BA disposed on the circumference toward the end surface B11 facing the platen.

FIG. 4 is a schematic diagram of the printing wire (1) group viewed from a direction perpendicular to FIG.

Next, the present invention configured as described above will be explained in detail. When current flows through one or more coils 10 selected based on the print command signal, the magnetic flux flowing through the magnetic path formed in the core 11, yoke 8, and side yoke 9 causes the core 11 and drive An attractive force is generated between the drive lever 2 and the drive lever 2, and the drive lever 2 rotates clockwise around the fulcrum shaft 12 against the return spring 14, and the printing wire 1 attached to the tip
is moved in the direction of arrow a and is struck onto printing paper via an ink ribbon (not shown) to print. After printing is completed, the drive lever 2 rotates counterclockwise around the fulcrum shaft 12 due to the repulsive force from the platen 17 and the return force of the return spring 14, and collides with the damper 15 fixed to the lever holder 16. then stop and wait in this position.

By the way, in this embodiment, printing gloss A# and C#
Since the arm is bent, there is no interference between the holes for A# and C# of wire guide group 3 that guide the printing wire, and the printing wire A
# and C# can be guided appropriately, high-quality printing can be obtained, and wear of the holes in the wire guide group 3 is reduced, making it possible to have a long life.

In addition, since the printing wire B# with a large inclination angle is arranged with an arm bent like Bb#, the printing wire tip position 18 is aligned with the platen cylinder when the impact dot head is installed in the printer, as shown in FIG. Even if the platen gap change amount Δg occurs due to variations in the printing speed, positional deviation, etc., the printing position shift amount Δρ during printing is minute, and high-quality printing can be obtained.

In addition, Ba# in the figure is a side view when the printing wire B# is arranged in a straight line, and when the platen gap change amount Δg occurs, the printing position deviation amount Δρ becomes large, resulting in poor printing alignment. .

〔Effect of the invention〕

As described above, in the present invention, a group of printing wires are arranged in a straight line and in a group with curved arms.
The printing wire can be properly held without interference from the wire guide hole, and it is possible to obtain high-quality printing equivalent to the printing wire arranged in a straight line without interference from the wire guide hole. Moreover, since the printing wire can be properly held, wear of the hole in the wire guide is reduced and a long life can be achieved. Furthermore, the force transmission efficiency of the printing wire increases, making it possible to reduce power consumption.

In addition, since the printing wire is arranged in a curved manner, which would require a large inclination angle if it were arranged in a straight line, it is possible to minimize the printing position deviation due to changes in the platen gap, and it is possible to obtain high quality printing. can.

Furthermore, the printing wires arranged with bent arms only need to be wire guide holes that interfere with each other, and those that have a large inclination angle when arranged straight, making only the drive unit that drives the printing wires arranged with bent arms larger. It is possible to get a grip on the impact dot, which is small and easy to assemble.

[Brief explanation of drawings]

Fig. 1 is a line sectional view of an apparatus showing one embodiment of the present invention;
The figure is a printing wire placement diagram as viewed from arrow b of the above device, and FIGS. 3 and 4 are side views of the printing wire arrangement of the same above device. l...A#, B#, C#...Printing wire 2...Drive lever 3...Wire guide group and above Applicant Seifu Ebson Co., Ltd. Agent Patent attorney Tsutomu Mogami and 1 other person 7 Printing wire 70 Coil Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] A group of printing wires with one end facing the platen disposed on a straight line and the other end on a circumference, a wire guide for holding the printing wire, and an electromagnetic drive for driving the printing wire. In a wire-type dot printer consisting of a unit, the group of printing wires are arranged on the circumference from one end face to the other end facing the platen, and some are arranged in a straight line and others are arranged in a curved manner. An impact dot head with a unique feature.