JPS6019544A - Impact printer head - Google Patents

Abstract

PURPOSE:To extend the life of a printing head by joining the tip of a U- or V-shaped flexible member arranged at the right angle to a driving spring member to the tip of the extension of an enable arm and the tip of a projection on a support member. CONSTITUTION:When an electromagnet 5 is electrically energized, the magnetic force thereof cancels the magnetic force of a permanent magnet 4 and due to losing the attracting force thereof, a mobile section 6 acts so as to separate from a core 3 by a charged force of a plate spring 10. The mobile section 6 turns around the apparent center A and based on the motion of the mobile section 6, a wire 7 reaches a platen 13 through an ink ribbon 14 and a paper 15, then a strong impact is applied on the wire 7 while the mobile section 6 is halted in the motion and caused to turn around counterclockwise. But this impact force is transmitted to plate springs 18 and 17 sequentially and received with a support 16 to avoid excessive force on the plate spring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an impact printer head that obtains prints by selectively striking a plurality of fine wires onto recording paper using an ink ribbon. The structure and problems thereof The structure of the conventional example will be explained with reference to FIG.

FIG. 1 depicts only one of the printing movable parts, which usually have several layers. In the figure, the arm 101 is a leaf spring 10.
2 and a printing stylus 10 at the end.
3', (The leaf spring 102 is attached to the main body part 111 of the head. Also, the armature 104 is attached to the arm 101. The arm 101, the leaf spring 1
02, the printing stylus 103, and the armature 104 form a movable part 112. 107 is a platen;
An ink ribbon 106 is provided between the printing stylus 103 and the printing stylus 103.
A recording paper 106 is interposed. 108 is a magnetic circuit, in which a permanent magnet 109, an electromagnet 110, a leaf spring 102,
It has an armature 104. The operation will be explained below. During non-printing, the electromagnet 110 is not energized, and the armature 104 is attracted to the magnetic circuit 108 by the magnetic force of the permanent magnet 109. At this time, arm 101
is biased by the leaf spring 102Q, and the −-shaped stylus 103
There is a gap between the armature 105 and the ribbon 105. If the electromagnet 110 is energized in this state, a magnetic field is generated that cancels the magnetic force of the permanent magnet 109, and the magnetic circuit 108
The movable part 112, which does not lose its suction force, is rotated clockwise by the biasing force of the leaf spring 102. At this time, the tip of the printing stylus 103 hits the platen 107 via the ink ribbon 1o6 and the recording paper 106, and the ink ribbon 105
of ink is transferred onto the recording paper 106, and one point is recorded. When the electromagnet 110 is de-energized, the permanent magnet 109
The attractive force starts working again, and the movable part 112 is attracted to the magnetic circuit 108 to attract the armature 104, thereby completing one cycle of recording.

However, in the above configuration, when the movable part 112 is hit, a rotational force in the reverse direction of the printing stylus 103i acts on the movable part 112, causing the leaf spring 102i to deform as shown in FIG. There is a problem in that a large stress is applied to the joint between the spring 102 and the arm 101, and the spring 102 breaks at this joint due to fatigue during use.

Further, due to the counterclockwise rotation, the movable part 112 undergoes complicated vibrations, and it takes time to stabilize the movable part 112, which is an obstacle to increasing the speed. Further, due to the complicated vibrations caused by the vibration, the armature 104 and the magnetic circuit 108 come into uneven contact, resulting in severe wear of the contact surfaces.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and its entire purpose is to provide an impact printer head with an inexpensive structure that has a stable operation and a long life by vibrating the movable part only with simple harmonic motion. .

Structure of the Invention In order to achieve the above object, the present invention provides a printing wire movable part in which a movable arm having a printing wire at the tip is attached to a support member via a driving spring member, and a printing wire movable part provided in the printing wire movable part. The armature is provided with a magnetism [q path] for driving the armature, and a tip of a protrusion provided on the support member facing near the center of rotation of the printing wire movable portion, and a tip of a protrusion facing the vicinity of the center of rotation of the printing wire movable portion on the movable arm. A U-shaped or
The feature is that the tips of each of the letter-shaped flexible members are joined, and the advantage is that the movement of the rotation center of the movable part of the printing wire is regulated, and complicated vibrations during printing impact can be completely prevented. It has the following.

DESCRIPTION OF EMBODIMENTS FIG. 3 shows an embodiment of the print head of the present invention. In FIG. is an electromagnet, and cancels the magnetic force of the permanent magnet 4 when energized. The movable part 6 is composed of a wire 7, which is a printing stylus, an arm 8, an armature 9, and a leaf spring 1o, which is a flexible member. As shown in FIG. 6, the leaf spring 10 is divided into parts 1d and 1o", the ends of which are fixed to a support 16 provided on the yoke 2. The leaf spring 10 and the armature 9 are made of magnetic material, and the yokes 1 and 2, the core 3, the leaf spring 10, the armature 9, and the support 16 form a closed magnetic path. I'm here.

The head cover 11 has a wire guide 12, and the wire 7 passes through a wire guide hole provided therein. An ink ribbon 14 and recording paper 15 are arranged between the platen 13 and the wire 7.

No. 414. As shown in FIG. 6, the fixed part 1 of the leaf spring 10
A support member 16 is connected to the support member 16, and a portion of the support member 16 extends slightly in front of the center of rotation of the movable part 6 (indicated by A in the figure), and a flexible member is attached to the tip end 16' of the support member 16. A leaf spring 1
An arm 8, to which one end of the arm 7 is joined, also extends to near the center of rotation of the movable part 6, and one end of a leaf spring 18, which is a flexible member, is joined to its tip 8'. Leaf spring 17
.
, 18 are joined to each other at their other ends.

In this state, the movable part 6 can rotate around the rotation center A.

The operation will be explained below.

When the electromagnet 5 is not energized, the armature 9 is attracted to the core 3 by the magnetic force of the permanent magnet 4 against the spring force of the leaf spring 1o, and the tip of the wire 7 is pulled away from the platen 13, the recording paper 15, and the ink ribbon 14. It is separated and is in a non-printing state. At this time, spring 1Q stores energy for recovery.

Next, when the electromagnet 6 is energized, its magnetic force cancels the magnetic force of the permanent magnet 4, and the attractive force is lost, so that the movable part 6 moves away from the core 3 by the urging force of the leaf spring 1o. At this time, the movable part 6 rotates around the apparent rotation center A. Since the rotation angle of the movable part 6 is as small as 1° to 2°, the rotation center A is almost fixed at one point. The movement of the movable part 6 causes the wire 7 to pass through the ink ribbon 14 and the paper 16 to the plantain 1.
3, a strong impact is applied to the wire 7 and its movement is stopped, so the movable part 6 tries to rotate around the wire 7 in a counterclockwise direction. However, this impact force is transmitted to the leaf springs 18 and 17 in this order and is received by the support body 16, so that no excessive force is applied to the leaf spring 1Q.

The leaf springs 17 and 18 have sufficient strength not to buckle against the compressive force in the longitudinal direction that occurs upon impact. When the movable part 6 rotates around the rotation center A, the leaf springs 17 and 18 can be freely deflected and do not interfere with the rotation.

As described above, according to this embodiment, by providing the leaf springs 17 and 18, the center of rotation can be firmly held against impact during printing.
The lifespan of 0 can be extended. Also, the plate springs 17, .
When joining the ends of the movable part 18, the joining position can be determined according to the dimensions of the movable part 6 after it is assembled, which has a great effect in terms of productivity.

In this embodiment, the support 16 is joined to the plate notch 10, but the support 16 may be an independent body, a part of the yoke 2, or a part of the head cover 11. It's good to have.

Further, although the leaf springs 17 and 18 are arranged on the side opposite to the protruding side of the wire 7 with respect to the leaf spring 1o, they may be arranged on the same side.

Further, in the embodiment, the leaf springs 17 and 18 are arranged at approximately right angles to the leaf spring 10, but they may be arranged at an acute angle as long as some deterioration in performance is not an issue. Further, although the leaf spring 18 itself or its extension passes through the center of rotation Ai, it is sufficient to pass near the center of rotation as long as a slight reduction in performance is acceptable.

In addition, in the embodiment, a V-shaped flexible member was formed using the leaf springs 17 and 18, and both ends of the flexible member were joined to the tip 16' of the support 16 and the tip of the extension of the movable arm 8. The member may be constructed in one piece, in which case it may be U-shaped.

Effects of the Invention The present invention is configured such that each end of a U-shaped or 7-shaped flexible member is joined to a support body and an arm end to restrict movement of the apparent center of rotation of the movable part. Because it is made of wood, it absorbs the impact during printing and prevents excessive stress from being applied to the drive spring side that makes up the movable part. This prevents the spring side from breaking and extends the life of the print head. It is possible to make it longer. Further, since complex vibrations that occur at the time of impact are prevented, the movable part settles quickly after the printing operation, and the recording speed can be increased.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main parts of a conventional print head, Fig. 2 is an explanatory diagram of its operation, Fig. 3 is a cross-sectional view showing an outline of a print head according to an embodiment of the present invention, and Fig. 4 is a diagram of the same head. FIG. 5 is a side view of the movable part, and FIG. 5 is a perspective view of the movable part of the same head. 1.2... Yoke, 3... Core, 4.
...Permanent magnet, 5...Electromagnet, 6...
Movable part, 7...wire, 8...movable arm, 9...armature, 1o...plate spring, 16...support body , 17, 18...
・Plate spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1θ7 Figure 3

Claims (1)

[Claims] A printing wire movable section in which a movable arm having a printing wire at the tip is attached to a support member via a drive spring member, and a magnetic circuit for driving an armature provided on the printing wire movable section, as described above. The support member is provided with an extra-large protrusion near the center of rotation of the movable part of the printing wire, and the movable boom is provided with an extension part of an extraordinarily large size near the center of rotation of the movable part of the printing wire, At each of the tip of the extension part of the movable arm and the tip of the projection of the support part,
U arranged so as to be approximately perpendicular to the movable spring member
An impact printer head characterized in that each tip 4 of a letter-shaped or V-shaped flexible member is joined to the tip 4.