JPH0480046A - Printing head of dot printer - Google Patents

Abstract

PURPOSE:To enable the above printing head of a dot printer to be adjusted to a gap comforming to a paper thickness by a method wherein core of an electromagnet driver is so fitted to a solenoid base as to be capable of being transferred by a micro distance in an insertion direction via an elastic component, and a ring like push-up plate is put between the core and a backup component on an opposite side of an armature. CONSTITUTION:A core 17 of an electromagnetic driver 15 is so fitted to a solenoid base 14 as to be capable of being transferred by a micro distance in an insertion direction via an elastic component 30 (for instance, that like a belleville spring). A ring like push up plate 31 having a depressed and projected form is put between a backup component 32 on an opposite side of an armature 7 and the core 17. This ring like push up plate 31 has a depressed part 31b and a projected part 31c corresponding one to one to each core and becomes capable of being rotated from outside with a lever 31a. Further, the lever 31a may be operated by a paper thickness adjusting signal with an electromagnetic actuator of a solenoid or the like provided to a printing head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a print head for a dot printer.

[Conventional technology]

The wire used in the print head of a dot printer is driven using an electromagnetic driver. One electromagnetic driver is provided for each wire, and by exciting the coil, the wire is attracted through the armature to print dots.

A conventional example of the print head of such a dot printer is shown in No. 7.
As shown in the figure. The electromagnetic driver 115 has a bobbin 118, and by energizing a coil 119 wound around the bobbin 118, the core 117 is energized and the armature 1 is energized.
Tip part 107a of armature 107 that sucks 07
:C is formed with a brazed or welded wire 124, the armature 107 is sucked, and the wire 1
24 protrudes from the nose 126 for printing. The amount that the wire 124 protrudes is determined by the gap δ between the core 117 and the armature 107, and in order to satisfy everything from thin single sheets of paper to thick copy paper and engraving, this gap δ must be set to a thick For details on how to accurately adjust this gap δ, which had to be set widely for the
48071j and the same (published patent publication [Sho 62-236
752J, a method of adjusting the gap by inserting a spacer under the armature, and a method of adjusting the gap, as shown in the published patent publication "
As shown in Sho 6O-201963J, there are methods of adjusting the gap δ by changing the position of the stopper. [Problem to be solved by the invention] However, all of these methods adjust the gap to a constant value. This method does not involve readjusting the gap according to the paper thickness until after adjusting the gap δ widely for thick paper and installing it in the printer main body. Although setting the gap δ wide in this manner is suitable for thick paper, it can be said to significantly reduce efficiency and printing speed for thin paper.

On the other hand, there is a relationship between the gap δ between the core and the armature and the impression force F, which is inversely proportional to the square of the gap, as shown in FIG.

Therefore, using this Figure 8, we have determined two cases: by moving the print head as described above, and adjusting the paper noise so that the distance between the print head and the printing paper is always kept constant, and when not adjusting the paper thickness. The relationship between the gap δ between the core and the armature and the striking force F will be described below.

When the paper thickness is adjusted, the printing force F when the wire protrudes from the initial gap δ0 by the stroke (δ0 to δ2) for printing on thick paper can also be obtained as F2. However, the stroke for printing on thin paper (
δ. −δI) when the wire protrudes by an amount F
Although it has a structure that can reach up to F2,
F and L cannot be produced.Furthermore, if you fix the print head without adjusting the paper thickness, you can obtain the printing force F when using thin paper, but the stroke (δ .-δ2), resulting in a decrease in printing speed.

Therefore, an object of the present invention is to provide a print head that can adjust the gap to suit the paper thickness.

[Means to solve the problem]

In order to achieve the above object, the present invention has the core of an electromagnetic actuator mounted on the lunoid base so as to be able to move a minute amount in the insertion direction via an elastic member, and a ring placed between the core of the electromagnetic driver and the backup member on the opposite side of the armature. The present invention provides a print head for a dot printer characterized by having a shaped push-up plate interposed therebetween.

[Effect]

By rotating the ring-shaped push-up plate, the core is pushed out in the direction of the armature via the elastic member, and the value of the gap δ between the core and the armature can be changed. You can get the impression power.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure and operation of an embodiment of a print head for a dot printer according to the present invention will be explained below with reference to the drawings.

FIG. 1 is a cross-sectional view of the 9-pin print head according to this embodiment;
FIG. 2 is a cross-sectional view of the working part of the print head according to this embodiment, and FIG. 3 is an explanatory diagram of the ring-shaped push-up plate.
(al is a plan view, (b) is an AA sectional view in (a),
FIG. 4 is a graph showing the relationship between the gap and the impression force in this example.

As shown in FIG. 1, the print head according to this embodiment has an armature unit 1, a solenoid unit 2, a wire unit 6, and a gap adjustment unit 4.
They are configured to be integrated by a fastener 22. Note that this embodiment shows an example in which the present invention is applied to a 9-pin print head. Therefore, in FIG. 1, which is a cross-sectional view, similar printing mechanisms are shown, one at the top and one at the top, and wires 2 of the similar printing mechanisms are connected between them.
Only three pieces of 4 are shown.

When the coil 19 wound around the bobbin 18 of the electromagnetic driver 15 is energized from the connector 20 via the printed circuit board 16, the core 17 is excited and the armature 7 is attracted via the regular 16.

Also, Armachia base 6 of Armachia Uninote 1
, a bin 10 and an armature guide 9 are provided for the armature 7. The armature 7 is supported by a pin 10 in a hole 11 drilled near the fulcrum 5 of the armature 7, and supported by armature guides 9 in the vicinity of the tip 7a of the armature 7 so as to be sandwiched from both sides. Its movements are regulated to prevent it from happening. Also, at this time, the regular 13 is
This prevents the core 17 and armature 7 from sticking together.

Note that when the armature 7 is not attracted, the vicinity of the fulcrum 50 is pushed toward the solenoid base 14 by the armature spring 8, while the vicinity of the tip 7a is pushed toward the solenoid base 14 by the armature spring 8.
The wire spring 25 incorporated in the armature base 6 is pushed against the stopper 12 attached to the armature base 6. Also, when the armature 7 is attracted,
The wire 24 brazed or welded to the tip 7a of the armature 7 is guided by wire guides 21a to 21e fixed in the nose 26 of the wire unit 6, and protrudes from the tip of the nose 23 for printing. be exposed.

As for the wire stroke at this time, when printing on thick paper, it is necessary to widen the gap between the core 17 and the armature 7 and make it a long stroke. but,
If left as is, there will be adverse effects such as the inability to obtain sufficient printing force when using thin paper as described above, and the reduction in printing speed due to the need for more flow than necessary. Therefore,
In this embodiment, a gap adjustment unit 4 is provided in the print head to adjust the gap between the core 17 and the armature 7.

The core 17 of the electromagnetic driver 15 is attached to the solenoid base 14 via an elastic member 30 (such as a disk spring) so that it can move a minute amount in the insertion direction. A ring-shaped push-up plate 61 having an uneven shape is sandwiched between the backup member 32 and the core 17. This ring-shaped push-up plate 61 is
As shown in FIG. 3, each core has a concave portion 31b and a convex portion 31C in one-to-one correspondence, and a lever 31a
It can be rotated from the outside. Note that the lever 31a may be operated in response to a paper thickness adjustment signal by an electromagnetic actuator (not shown) such as a solenoid provided in the print head. Further, when a head carrier (not shown) on which the print head is placed moves from side to side, the print head may be operated by hitting a dog (not shown).

FIG. 2 shows a cross-sectional view when the ring-shaped push-up plate 61 is in operation. The lever 31a of the ring-shaped push-up plate 61 (
3) so that the portion of the ring-shaped push-up plate 31 in contact with the core 17 changes from the concave portion 31b to the convex portion 31C, the core 17 is pushed up and approaches the armature 7, narrowing the gap.

FIG. 4 shows the relationship between the gap δ and the stamping force F in this embodiment. When using thick paper, the gap is δ. (thickness), and the s1-o-ri is (δ0 (
thickness) - δ2), and the stamping force is F2. To sharpen thin paper, narrow the gear and tap δ. (thin), the required stroke is (δ. (thin) - δ2), and the stamping force is also F2. In this embodiment, the concave portion 31b and the convex portion 31C are It has been explained that the gap can be adjusted in two stages using a ring-shaped push-up plate 61 having However, the gap can also be adjusted in an analog manner. A vertical sectional view illustrating the effect in this case is shown in FIG. In this case, the core 45 was configured to contact the saw-toothed ring-shaped push-up plate 41 by adjusting the angle as shown in the figure, but the core 45 may be contacted by embedding a hard ball.

〔effect〕

As is clear from the above description, according to the present invention, the core of the electromagnetic driver is attached to the solenoid base so as to be able to move a minute amount in the insertion direction via an elastic member, and a ring is inserted between the core and the backup member. Since the push-up plate is interposed, the gap can be adjusted to suit the paper thickness.

Therefore, high printing force can be obtained even when printing on thin paper, which has the effect of increasing electromagnetic conversion efficiency and, in turn, increasing printing speed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the print head according to the present invention, FIG. 2 is a cross-sectional view of the active part of the print head according to the present example, and FIG. 3 is a ring-shaped push-up plate. In the figures, (a) is a plan view, tb+ is a sectional view, FIG. 4 is a graph showing the relationship between the gap and the stamping force in this example, and FIG.
The figure shows another example of the ring-shaped push-up plate.
a) ;? 6 is a sectional view of the working part when using the ring-shaped push-up plate shown in FIG. 5, FIG. 7 is a sectional view of a conventional print head, and FIG. The figure is a graph showing the relationship between the gap and the printing force in a conventional print head. 6... Armature base, 7.107... Armature, 14...
・Solenoid base, 15... Electromagnetic driver, 17.117... Core, 9.119... Coil 4.124... Wire, 0... ...Elastic member, 1.41...Ring-shaped push-up plate, 2...
・Backup parts. Figure 3 (Q) Figure 5 (Q) (b) Figure 6 7th size 11'9

Claims (1)

[Claims] A plurality of armatures are arranged radially on the armature base and have wires formed at their ends; an electromagnetic driver having a core, a coil, and a solenoid base that constitutes a magnetic circuit together with the core, and by driving the electromagnetic driver, the armature is actuated to cause the wire to protrude and print dots. In a print head that performs A print head for a dot printer, comprising: a ring-shaped push-up plate interposed between the other end of the core and the backup member.