JPS60176776A - Electromagnet device for spring releasing type dot printer - Google Patents

Abstract

PURPOSE:To enhance operating speed and reduce power consumption, by a method wherein an armature is magnetically attracted by an upper magnetic pole piece and an end face of a bar part of a yoke when a coil is deenergized, and the armature is magnetically attracted by a lower magnetic pole piece when the coil is excited. CONSTITUTION:The magnetic pole pieces 5, 6 of a magnetic pole block 4 are connected with each other in a U-shaped form through a permanent magnet 7 as a connecting piece, and the block 4 is jointed to an end face of one bar part 2 of the yoke 1. The armature 9 is constituted of an intermediate base part 10 constituting a fulcrum R, a driving end 11 faced to the magnetic piece 6 through a gap G therebetween, a driving end 12 for driving a printing wire 14, and a fixing part 13 for fixing a free end of a release spring 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a spring release type dot blink electromagnet device.

BACKGROUND TECHNOLOGY] As shown in the first diagram, the electromagnet device of a spring release type dot printer consists of a yoke A in the shape of an opening, a permanent magnet B inserted in the middle of the yoke A (including the end of the yoke), and a permanent magnet. Coil C wrapped around yoke A to offset the magnetic attraction force of B
The base end is fixed to one end of the yoke A via the leaf spring D, the free end is fixed to the base end of the printing wire E, and the middle part faces the other end of the yoke A and receives its magnetic attraction force. , moreover, when the coil C is not energized, it is attracted to the other end of the yoke, producing a spring biasing force, and when the coil C is energized,
A dot printer is generally constructed by arranging a plurality of sets (for example, 9 sets) of this electromagnetic device in parallel, with each set of The electromagnetic device biases Amathia F, which has a spring biasing force, with permanent magnet B, and cancels the magnetic attraction force of permanent magnet B by excitation of coil C corresponding to the printed area, thereby reducing the spring biasing force of Amathia F. Release wire E
Printing is performed by driving the .

In this case, the deflection fulcrum of the Amathia F is fixed at one end of the yoke A, while the point receiving the magnetic attraction force of the Amathia F is located opposite the other end of the yoke A. It is difficult to match the operation, which limits high-speed operation, and since the magnetic force of the permanent magnet B is increased, the size of the permanent magnet, that is, the device, increases, and there are other problems, such as an increase in power consumption.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide an electromagnet device for a spring-release type dot printer that can achieve high-speed operation and low power consumption. .

[Disclosure of the Invention (Example) The present invention will be explained below based on FIGS. 2 and 3, which are shown as an example.

In the figure, a yoke 1 is made of a magnetic material and is formed into a U-shape having one leg 2 and the other leg 3.

Reference numeral 4 denotes a magnetic pole piece block in which vertically opposing magnetic pole pieces 5.6 made of magnetic material are successively arranged in a U-shape with a permanent magnet 7 as a connecting piece. If the connecting piece is larger than the permanent magnet 7, the permanent magnet 7 is inserted in the middle of the connecting piece integrally connected to the magnetic pole piece 5.6. The lower magnetic pole piece 6 of the magnetic pole piece block 4 is joined to the end face of one leg 2 of the yoke 1, and the open ends of both magnetic pole pieces 5.6 are located on the other leg 3 side of the yoke 1. .

8 is a coil for canceling the magnetic attraction force of the permanent magnet 7, and is wound around the other leg portion 3 of the yoke 1.

9 is an amatia made of magnetic material, and the other leg end surface 3
A movable gap extends between the intermediate base 10 (specifically, the lower surface 10a of the intermediate base 10), which together with the inner corner of the intermediate base 10 constitutes the fulcrum R of the angular displacement operation, and the magnetic pole piece 5.6 extends to one side of the intermediate base 10. A first drive end 11 is located with G interposed therebetween, a second drive end 12 extends to the other side of the intermediate base 10 and drives the printing wire 14, and furthermore, the intermediate base 10 and the second
A spring fixing portion 13 for fixing the free end of the release spring 15 is provided protrudingly between the drive portion 112 and the release spring 15 . When the coil 8 is demagnetized, the first driving αfil 11 is magnetically attracted to the upper magnetic pole piece 5, and the intermediate base 10 is magnetically attracted to the other leg end surface 3a by the magnetic attraction force of the permanent magnet 7, so that the Amachia 9 remains stationary. This is what we are doing. The release spring 15 has its base end pressed against the upper surface of the upper magnetic pole piece 5 by a presser plate 16 and a screw 17.
The spring force is set to a value smaller than the force of magnetic attraction when the coil 8 is demagnetized.

Reference numeral 18 denotes an elastic member that elastically presses the amachia 9 against the other leg end surface 3a.
The upper surface 10b of the leg 3 is disposed in a slightly compressed manner, and the elastic force thereof is positioned so as to act on a line extending from the inner surface of the other leg 3.

When the coil 8 is excited, the magnetic force generated by the coil 8 and the magnetic attraction force of the permanent magnet 7 cancel each other out, and the amatia 9
from the upper pole piece 5 to the intermediate base 1
0 (specifically, the lower surface 10a of the intermediate base 10) is released from the other leg end surface 3a, and the spring force of the release spring 15 causes the amachia 9 to be angularly displaced as shown in the third figure.
Its second drive end 12 causes the printing wire 14 to project.

In this case, the magnetic force of the coil 8 cancels out the magnetic attraction force of the permanent magnet 7, and also acts to attract the first drive end 11 through the lower magnetic pole piece 6, so that the magnetic force of the amatia 9 Make the operation faster. And a very short time coil 8
When the excitation is finished and the state is demagnetized, the first driving end 11 of the amachia 9 is moved to the upper magnetic pole piece 5 by the magnetic attraction force of the permanent magnet 7 again, and the lower surface 10a of the intermediate base 10 (in other words, the lower surface 10a of the intermediate base 1o ) are each magnetically attracted to the other leg end surface 3a, so that the amachia 9 is angularly displaced in the opposite direction to that described above, and its second drive end 12 moves the printing width 14 into the second position.
Return to the position shown.

In this way, the angular displacement operation of the amachia 9 is performed, but what is important here is that the fulcrum R in the angular displacement operation is the force acting on the first drive end 11 and the intermediate base 10 (specifically, the lower surface 10a of the intermediate base 10). It is a point in a position that receives a couple of . That is, the fulcrum R is located on the line where the lower surface 10a of the intermediate base 10 and the inner corner of the other leg end surface 3a come into contact.

Another important point is that the first drive unit 111 receives a magnetic attraction force from the lower magnetic pole piece 6 when the coil 8 is energized.

With this configuration, since the amatia 9 has a center of angular displacement, the operation of the amatia 9 can be easily matched and the operation can be made faster, and when the amatia 9 receives the magnetic attraction force of the permanent magnet 7, the upper magnetic pole Since a superimposed couple acts on the piece 5 and the other leg 3, the magnetic force of the permanent magnet 7 can be made smaller compared to the conventional one, which means that the excitation current for the coil 8 can also be made smaller, resulting in lower consumption. Electricity can be achieved, and the permanent magnet 7 and the entire electromagnet device can be made smaller.

Moreover, the lower pole piece 6 facilitates the above-mentioned action and increases its effectiveness.

[Effects of the Invention] The electromagnet device of the spring release type dot printer of the present invention has a U-shaped yoke and vertically opposing magnetic pole pieces connected in a U-shape by a connecting piece in which a permanent magnet is inserted. Moreover, the lower magnetic pole piece is joined to the end face of one leg of the yoke, and the open α1aI of both magnetic pole pieces exerts a magnetic attraction force between the magnetic pole piece block located on the other leg side of the yoke and the permanent magnet. a coil wound around the yoke for counterbalancing; an intermediate base that constitutes a fulcrum for angular displacement motion together with the inner corner of the end face of the other leg; and an intermediate base that extends to one side and is movable between the magnetic pole pieces. an amatia consisting of a first drive end positioned with a gap in between and a second drive end extending to the other side and driving the printing wire; and urging the amatia to release from magnetic attraction by a permanent magnet; Moreover, the spring force is smaller than the force of magnetic attraction when the coil is demagnetized, and the release spring is ω11. However, this magnetic attraction is released when the coil is energized, and the first drive end receives magnetic attraction from the lower magnetic pole piece, which has the advantage of increasing operation speed and reducing power consumption. has.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an electromagnetic device of a general spring release type dot printer, FIG. 2 is a vertical cross-sectional view showing an embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view showing its operation. 1-yoke, 4--magnetic pole piece block, 7--permanent magnet, 8-coil, 9-amathia, I4--printing wire,
15-・Release spring. Figure 1 Figure 2

Claims (1)

[Claims] (1) A square-shaped yoke and vertically opposing magnetic pole pieces are connected in a square shape by a connecting piece with a permanent magnet inserted, and the lower magnetic pole piece is connected to the end face of one leg of the yoke. a magnetic pole piece block joined to the yoke and having open ends of both magnetic pole pieces located on the other leg side of the yoke; a coil wound around the yoke to cancel the magnetic attraction force of the permanent magnet; an intermediate base that constitutes a fulcrum for angular displacement motion together with the inner corner of the end face of the other leg; a first drive end that extends to one of the bases and is positioned with a movable gap between the pole pieces; and a second drive end that extends to drive the printing wire, and the amatia is biased to release it from the magnetic attraction by the permanent magnet, and the spring force is applied to the magnetic attraction when the coil is demagnetized. The amatia is magnetically attracted to the upper magnetic pole piece and the end face of the other leg when the coil is demagnetized, and this magnetic attraction is released when the coil is energized. . An electromagnet device for a spring release type dot printer, wherein the first drive end receives a magnetic attraction force from the lower magnetic pole piece.