JPS6024960A - Printing head of impact-dot printer - Google Patents

Abstract

PURPOSE:To lessen the loss of magnetic energy of magnet by making the magnetic reluctance of the magnetic path by a method in which an auxiliary plate spring is provided between an armature and a plate spring, and a hole is provided in the magnetic path portion of the auxiliary plate spring in such a way as to enable the armature to directly contact with the plate spring. CONSTITUTION:An armature 11 is directly contacted with a plate spring 9. Since an auxiliary plate spring 9b plated with a braze is present, the projection 21 of the armature 11 is fixedly connected with the plate spring 9 by a braze intruded by capillary phenomenon in the brazing operation between the projection 21 of the armature 11 and the plate spring 9. Since the auxiliary plate spring 9b is not interposed between the projection 21 of the armature 11 and the plate spring 9, the gap between them can be minimized by the braze, and therefore, the magnetic reluctance of the magnetic path can be lessened and the wasteful loss of the magnetic energy of the permanent magnet 5 can be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention operates by bending a leaf spring taken by Armadure and driving a printing wire by the energy stored in the leaf spring. Inbaku I to carry out
・Dot printer print] to the head! I do it.

(Objective of the Invention) The object of the present invention is to alleviate the concentration of stress on the leaf spring, or to facilitate processing even when the number of printing wires is large and the collector slenderness near the printing wire attachment part A1 is high. Therefore, it is an object of the present invention to provide a printer head for an impact dot printer which has a configuration in which an auxiliary leaf spring is interposed between the arture and the leaf spring, and in which case the magnetic resistance of the magnetic path of the magnet does not increase. .

[Configuration of Example]

Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

゛In Fig. 1, a frame 1 consists of a rear yoke 2, a side yoke 3, and a disk-shaped front yoke 4, and a circular ring is formed between the side yoke 3 and the front yoke 4. A permanent magnet 5 and a spacer member 6 are interposed. At the same time, the rear yoke 2 is screwed to the side yoke 3 by a plurality of screws 7, and the front yoke 4 is screwed to the spacing member 6 by a plurality of screws 8. It is formed to protrude radially from the spring board 10 toward the inside 15, and its base end, the leaf spring board 9a, is connected to the space 1).
It is clamped and fixed between the member 6 and the front yoke 4. At the free end of each leaf spring 9, an auxiliary leaf spring 9b and an armature 11 are attached to the front side (<l).
The proximal end of the printing wire 12 is fixed to the free end of the auxiliary leaf spring 9b by the solder (=I GJ), and the leaf spring part 10 The details of the leaf spring portion 10 will be described later.The 24 side magnet devices 13 corresponding to the leaf springs 9 each have their tips attached to the back surface of the free end of the corresponding leaf spring 9. It consists of an iron core 14 facing the L
12. The bottom of the iron core 14 is screwed to the side yoke 3 by a plurality of screws 16. Mako, excitation” Il 15
An excitation current is supplied from the power supply through the circuit board 17. Further, the tip of the printing wire guide frame 18 is inserted through the printing wire guide frame 18 .

Next, the detailed structure of the leaf spring section 10 will be explained with reference to FIGS. 2 to 4.

First, as shown in FIG. 2, the leaf spring 9 forms a leaf spring base plate 9a connected in an annular manner at each base end thereof.

In Fig. 3, the auxiliary leaf spring 9b is provided with a hole 19 for armature mounting from the center to the base end, and a hole 20 is provided at the tip for mounting the printing wire. It is being Also, the thickness of the auxiliary plate spring 9b is the same as that of the plate spring 9.
It has a thinner structure.

In FIGS. 4(a) and (1), a protrusion 21 is provided on the bottom of the armadure 11, and this protrusion 21 is inserted into the armature receiving hole 19 of the auxiliary leaf spring 9b. It has been inserted and the plate has reached the spring 9. Further, the leaf spring 9 extends only to the vicinity of the center of the armature 11, and the auxiliary leaf spring 9b extends from behind the rear end of the armature 11 to the tip. Here, the rear end portion of the auxiliary plate spring 9b is bent by bending when the plate spring 9 and the iron core 14 collide. In addition, the armature 11, the auxiliary leaf spring 9b, and the leaf spring 9 temporarily fasten the armature 11 and the leaf spring 9 with the auxiliary leaf spring 9b interposed between the j]-gusset core 11 and the leaf spring 9. The portion 22 is temporarily fixed by laser welding and then brazed.

[Operation of the embodiment]

Next, the operation of the above configuration will be explained with reference to the drawings.

I'l1 head odor" (always permanent magnet 5, spacer part @ 6, leaf spring board 9a, front yoke 4.7' - gusset core 111, leaf spring 9, iron core 14, rear yoke 2 and side yoke 3) A magnetic path is formed, and each leaf spring 9 is attracted to the iron core 14 by the rd & force of the permanent magnet 5, and the free end is displaced backward to store a spring force of 1 energy. When the excitation coil 15 of the electromagnetic device 13 is energized, the M magnet arrangement 1:) permanently changes to 141 by +41Ji5.
A magnetic flux is generated so as to cancel the flux, and the free end of the leaf spring 9 corresponding to the electromagnetic force 113 moves to the front side 1=to the right side in Fig. 1 due to the displacement energy. The printing wire 12 at the free end of the image forming apparatus 1 moves in the same direction, thereby printing on printing paper (not shown). Next, the excitation coil 15 of the electromagnet device 13
is de-energized, the free end of the leaf spring 9 is again connected to the permanent magnet 5.
It is attracted and returned to the iron core 14 by the magnetic force.

(Effects of Example) As described above, in the print head according to this example, the armature 11 is in direct contact with the leaf spring 9, and the brazing material plated on the auxiliary leaf spring 9b is used during brazing. The protrusion 21 of the armature 11 and the leaf spring 9 are fixed only by the brazing material that has entered between the protrusion 21 of the armature 11 and the leaf spring 9 due to capillary action. In this case, the magnetic resistance is large due to the constraint of the moon structure in order to obtain a predetermined fatigue strength between the protrusion 21 of the armature 11, which is a part of the magnetic path of the magnetic flux by the permanent magnet 5, and the leaf spring 9. The auxiliary plate that becomes
It is possible to minimize the gap caused by the wax between the protrusion 21 and the temporary spring 9. Therefore, the magnetic resistance of the front 8[] magnetic path can be suppressed lower than before, and the magnetic resistance of the permanent spring 15 can be suppressed. Eliminating energy waste is the 11th skill. Also, there are few good thermal conductors and good electrical conductors such as brazing filler metal in the temporary fixing part 22,
Since the flow of heat and current can be low, laser welding and resistance welding can be easily performed.
When the leaf spring 9 collides with the iron core 14, the bend 4j' of the leaf spring 9 goes -3. The auxiliary leaf spring 9b reaches the E-ment or almost zero position.
Since the rear ☆21 portion is extended, it is possible to alleviate stress concentration on the portion of the leaf spring 90 corresponding to the final end of the armature 11 due to the bending of the leaf spring 9, and the auxiliary leaf spring 9
There is no possibility that strong stress will be generated in the portion of the plate spring 9 corresponding to the rear end portion of the plate b, causing breakage or the like. Incidentally, if a plurality of auxiliary plate springs 9b are interposed by gradually shifting their positions, the change in thickness becomes even more gradual, and stress concentration can be further alleviated. Therefore, it is possible to extend the lamp life of the leaf spring 9.

Further, since most of the energy required to drive the printing wire 12 is stored in the leaf spring 9, the auxiliary leaf spring 9b does not require as much fatigue blowing as the leaf spring 9, and can be made thinner. Therefore, even if the interval between the punchings at the tip of the auxiliary leaf spring 9b becomes narrower, it is possible to maintain the ratio of the gap to the plate thickness to a certain degree (t).
It becomes easier to pick one out.

〔Effect of the invention〕

As detailed above, the prints 1 to 1 of the printer according to the present invention have an auxiliary leaf spring interposed between the armature and the leaf spring. Although τ is required, a hole is stepped in the part of the auxiliary leaf spring that corresponds to the lil & path, so that the armature can directly contact the leaf spring. Therefore, in order to obtain a predetermined fatigue strength, the influence of the auxiliary leaf spring that increases the magnetic resistance can be removed from the magnetic path, so the magnetic resistance of the magnetic path decreases and the 141 energy It is possible to keep the loss low.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a partially enlarged plan view showing the leaf spring, Fig. 3 is a partially enlarged plan view showing the auxiliary leaf spring of A, and Fig. 4 ( 4(a) is a partially enlarged plan view of the leaf spring portion, and FIG. 4(11) is a partially enlarged sectional view thereof. In the figure, 1 is a frame, 2 is a rear yoke, 3 is a side yoke, 4 is a front yoke, 5 is a permanent magnet EJ, 6 is a spacer member, 9 is a plate spring, 9a is a plate spring Ji￥ Plate, 01) is an auxiliary leaf spring, 10 is a leaf spring part, 11 is Armadure, 12
13 is the ffl magnet device, 14 is the iron core, 15 is the 1iijJ magnetic coil, 19 is the tour 7 mounting hole, and 21 is the protrusion. Patent No. 81 Applicant Brother Corporation Ltd. Director Katsuji Kawashima Figure 1 Figure 3

Claims (1)

[Claims] By bending a leaf spring which is held at one end by a frame and to which an armadure is attached, the energy stored in the leaf spring is used to drive a printing wire to perform a printing operation.
- In the head, one hole for armadure is drilled.
When the auxiliary leaf spring is turned to the right and the front-1 armadure is attached to the leaf spring via the auxiliary leaf spring, the armadue? A protrusion is provided on the armadure so that the armadure directly contacts the leaf spring through the hole.
Print 1-head of an impact dot printer that takes 161fi.