JPS6159917B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing hammer for a printing device (printer) used in an input/output device such as an information processing device.

In general, line printers, serial printers, etc., which are printing devices for electronic computers, perform printing operations continuously by applying an electrical signal to a printing hammer drive circuit so that the printing hammer repeats the operation of stamping the printing surface. It is the composition. As this type of printing hammer, types such as a moving coil type, a clamper type, a plunger type, and a spring charge type are used. Among these, the Clatpa-type printing hammer, as shown in FIG. An armature 6 is freely supported by a support member 3, has a printing wire 4 attached to its tip, and has the other end held by a sprig 5 fixed to the support member 3. . When no current is applied to the coil 2, the armature 6 receives a repulsive force from the spring 5 and remains stationary at a position determined by a stopper 7 disposed on the support member 3. When a current is applied to the coil 2 in this state, a magnetic flux passing through the core 1 is generated, and a magnetic attraction force is generated between the end face 1a of the core and the armature 6 facing it. It overcomes this and comes into contact with the core end face 1a.
Accompanying this operation, the wire 4 attached to the tip of the armature 6 moves in the direction of arrow A, and a printing surface (not shown) is engraved, thereby performing a printing operation. When the coil 2 is de-energized, the magnetic attraction between the core 1 and the armature 6 is released, and the repulsive force of the spring 5 causes the armature 6 to return to the position determined by the stopper 7. As mentioned above, in the normal state where coil 2 is not energized, core 1
and the armature 6 are arranged with a predetermined gap between them, so when the coil 2 is energized, the printing wire 4 cannot immediately perform a printing operation, and a certain amount of waiting time occurs, making it unsuitable for high-speed printing. Ta.

The purpose of the present invention is to provide a permanent magnet in a part of the iron core,
To provide a printing hammer for a printer in which a armature is released from magnetic influence when a coil is excited and a high-speed printing operation can be performed by the repulsive force of a spring latched to the armature.

The printing hammer of the printer of the present invention includes an elongated armature to which a printing wire for stamping a printing surface is fixed at one end, a hinge that supports the middle part of the armature, and the printing wire connected to the hinge. a spring fixed to an end of the armature on the same side as the armature; a support member for fixing the spring and the hinge; and the other end of the armature on the opposite side of the printing wire to the hinge; at least one iron core that contacts and separates;
It includes a permanent magnet that brings the armature into contact with the iron core, and an excitation winding that is wound around the iron core and releases the contact between the armature and the iron core. It is characterized by being stamped.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a cross-sectional structural diagram showing an embodiment of the printing hammer of the printer according to the present invention. As shown in FIG. 2, a resilient force generating source including a core 1' and a permanent magnet 8 disposed in a part thereof and a coil 2' wound around the core 1', and a supporting member 3' are connected by a hinge 9'. It includes an armature 6' which is freely supported, has a printing wire 4' attached to its tip, and has magnetic attraction surfaces at opposing positions via the hinge 9'. In the printing hammer configured as described above, when no current is applied to the coil 2', the armature 6' is connected to the permanent magnet 8.
The magnetic attraction force overcomes the repulsive force of the spring 5' having a force in the opposite direction, and is attracted to the end face 1a' of the core 1'. On the other hand, the printing wire 4' is in a positional relationship opposite to the suction part of the armature 6', and maintains the state before the printing operation. When current is applied to the coil 2' in this state, a magnetic flux in the opposite direction to that of the permanent magnet 8 is generated within the core 1', and since these magnetic attraction forces cancel each other out, the armature 6' is released from the magnetic influence. , separated from the end face 1a' of the core by the repulsive force of the spring 5'. Then, the printing wire 4' advances in the direction of arrow B by a distance determined by the effective length of the spring 5' and the gap between it and the printing surface (not shown), and prints a predetermined character by stamping the printing surface. . When the current supply to the coil 2' is stopped, the above state is canceled and the armature 6' is attracted to the end surface 1a' of the core by the attractive force of the permanent magnet 8. As a result, the printing wire 4' returns to its original position and the printing operation is completed.

FIG. 3 shows a schematic diagram of the printing hammer shown in FIG. 2 applied to a serial dot printer.
As shown in FIG. 3, there are several to several dozen printing hammers arranged radially and their printing wires 4'.
A wire guide frame 10 that converges around
, a ruby guide 11 for linearly aligning the printing wires 4', and a plate 12 for fixing them.
including. By arranging the printing heads radially in this manner, the coil 2' is biased toward the circumference from the center from the position of the hinge 9', but on the other hand, the area occupied by the coil 2' becomes large, and the coil 2' The space restrictions on the number of turns will be relaxed. Further, since a space can be formed between the hinge 9' and the printing wire 4', a heat dissipation effect due to the temperature rise of the coil 2' can be expected. On the other hand, the operation of the printing wire 4' is started from a state where the gap between the armature 6' and the core 1' is zero, and when the coil 2' is excited, the repulsive force by the core 1' becomes larger and the attraction by the permanent magnet 8 occurs in a short time. After that, high-speed printing operation can be performed by the repulsive force of the spring 5'. In addition, since the above-mentioned coil space has ample space, it is possible to realize a larger number of turns within a given space, and the magnetic flux generated by the core 1' is relatively larger than the magnetic flux generated by the permanent magnet 8. , it is fully expected that the above-mentioned repulsive force will become even more effective.

As explained above, according to the present invention, the printing wire fixed to the tip of the armature with the hanging member (hinge) as a fulcrum and the magnetic attraction part of the armature are arranged in opposite positions, so that the coil To obtain a printing hammer for a printer that enables high-speed printing operation in which a printing wire is operated only by the repulsive force of a spring when an equilibrium state of magnetic attractive force between the permanent magnet and the core is created after excitation and mutual influence is canceled. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural diagram showing an example of a conventional printing hammer, FIG. 2 is a cross-sectional structural diagram showing an embodiment of a printing hammer for a printer according to the present invention, and FIG. 3 is a cross-sectional structural diagram showing an example of a printing hammer shown in FIG. FIG. 2 is a schematic diagram when applied to a serial dot printer. 1'...core, 1a'...end face of core, 2'...coil, 3'...supporting member, 4'...printing wire,
5'...Spring, 6'...Amachiyua, 8...
Permanent magnet, 9'...hinge.

Claims (1)

[Claims] 1. An elongated armature to which a printing wire for imprinting a printing surface is fixed at one end, a hinge that supports the middle part of this armature, and an end of the armature on the same side as the printing wire with respect to this hinge. a support member that fixes the spring and the hinge; and at least one support member that contacts and separates from the other end of the armature on the opposite side of the printing wire with respect to the hinge. It includes an iron core, a permanent magnet that brings the armature into contact with the iron core, and an excitation winding that is wound around the iron core and releases the contact between the armature and the iron core. A printing hammer for a printer that is characterized by stamping the printed surface.