JPS6036462Y2 - printing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a printing device using a release type magnet.

An example of a printing mechanism using a release type magnet is shown in FIG.

In the figure, 1 is a frame, and 2 is a release type magnet fixed to the frame 1.

The release type magnet 2 includes a permanent magnet 3, a plurality of cores 4 surrounding the permanent magnet 3, and arranged in parallel in a direction perpendicular to the plane of the drawing.
It consists of a coil 5 wound around protrusions 4a and 4a' at both ends of each core.

An armature 7 attached to the frame 1 via a leaf spring 6 is opposed to the protruding parts 4a, 4a' of each core 4, and a retaining piece 8 is fixed to the upper end of the armature 7.

When the coil 5 is not energized, the armature 7 is attracted to the protrusion 4at4a' by the magnetic flux generated in the core 4 by the permanent magnet 3 as shown by the solid arrow.

A bushing rod 10 biased by a power spring 9 is slidably supported at a position corresponding to the retaining piece 8 of each armature 7 on the upper part of the frame 1, and the tip of the bushing rod 10- is attached to an engaging piece. It is engaged with 8.

11 is a sliding time adjustment screw that is screwed onto the upper part of the frenim 1 and engages with the power spring 9; 12 is a stopper that is fixed to the frame 1 and engages with the armature 7 at a predetermined time; 13ci;
A printing hammer 14 is movably provided on the frame 1 in correspondence with each engagement piece 8, and is fixed to the frame 1 and engages with the printing hammer 13 at a predetermined time to prevent vibration of the printing hammer 13 and double A damper for preventing stamping, 15 a connector fixed to the frame 1 and connected to each coil 5, and 16 a drive circuit connected to a connector 17 plug-in connected to the connector 15.

A plurality of printing mechanisms 40 having such a configuration are arranged in parallel along the printing surface as shown in FIG. 2, with the frame 1 positioned on the bed 30 of the printing device by the stepped portion 31 and the pin 32.

Now, from the position shown in FIG. 1, the drive circuit 16 energizes the coil 5 wound around the protruding parts 4a, 4a' of the core 4 corresponding to the printing hammer 13 to be printed for a short time via the connector 17.15. Then, the magnetic flux passing through the protrusion 4a * 4'' disappears, and the magnetic flux flows as shown by the dotted arrow and reaches the armature 7.
adsorption is released.

Therefore, the armature 7 is driven by the power spring 9 through the bushing rod 10 and the retaining piece 8, and swings in the direction of arrow A in FIG. 1 against the urging force of the leaf spring 6. ) Strike the lever 13 to swing it in the direction of arrow B.

After the armature 7 engages with the stopper 12 and stops, the printing hammer 13 continues to swing against the urging force of the printing hammer recovery spring 18 due to the energy given by the armature 7 up to that point. Printing is performed by pressing predetermined printed characters 36 attached to a belt 35 running along the printing surface against a platen 39 via a ribbon 37 and paper 38.

On the other hand, immediately after the armature 7 stops, the power spring 9 is returned to its original position by a separately provided reset mechanism, and the armature 7 is energized by the leaf spring 6 and returns to its original position, and the coil 5 is already energized. The protrusion 4 that is stopped
It is adsorbed to a*43'.

The printing hammer 13 that has completed printing also has a spring 18.
When activated, it returns to its original position and completes one cycle of operation.

Each printing mechanism 4 of a printing device having such a configuration and operation
0, the attractive force due to the magnetic flux of the permanent magnet 3 of the open magnet 2 is small at both ends, as shown in FIG. 3a.

When a plurality of printing mechanisms 40 are arranged in parallel as described above, the suction force is influenced by the adjacent printing mechanisms and becomes smaller only at both ends, as shown in FIG. 3.

For this reason, the kinetic energy of the amateur who hits the printing nozzle in this area with low suction force is different from that in other areas.
A drawback is that a constant print quality cannot be obtained for each printing hammer.

The present invention is intended to solve this drawback, and aims to provide a printing device that can make the quality of printing by each printing hammer constant by equalizing the suction force.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 and 5.

In the present invention, as shown in FIG.
A pair of auxiliary magnets 19, 19' are fixed to the outer ends of the permanent magnets 3.

The polarity of this auxiliary magnet 19, 19' is in the same direction as that of the permanent magnet 3.

By adding the magnetic flux of the auxiliary magnets 19, 19', the conventional attractive force shown in FIG. 3 is improved as shown in FIG. 5, and a uniformly distributed attractive force can be obtained.

As described above, according to the present invention, a uniformly distributed attraction force can be obtained by the action of the auxiliary magnets fixed to the outer ends of the printing mechanism at both ends, and the printing quality by each printing hammer can be maintained at a constant level. It is possible to

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional printing device, Fig. 2 is a plan view thereof, Fig. 3 is a distribution diagram of the attractive force of a permanent magnet, and Fig. 4 is an embodiment of the printing device according to the present invention. The front view and FIG. 5 are the same attraction force distribution diagrams. In the figure, 1 is a frame, 2 is a release type magnet, 3 is a permanent magnet, 4 is a core, 5 is a coil, 7 is an armature, 9 is a power spring, 10 is a bushing rod, 11 is an operating time adjustment screw, 13 is a printing hammer , 19 and 19' are auxiliary magnets, 36 is a type, 37 is a ribbon, 38 is paper, 39 is a platen, and 40 is a printing mechanism.

Claims (1)

[Scope of utility model registration request] a permanent magnet, a plurality of cores arranged in parallel surrounding the permanent magnet;
By energizing the coil of a predetermined core of a release type magnet consisting of a coil wound around the end of each core, the attraction of the armature facing the core is released, and the printing hammer is struck by the armature. In a printing device in which a plurality of printing mechanisms of the same shape for printing are arranged side by side along a printing surface, an auxiliary magnet having a polarity in the same direction as the permanent magnet is fixed to the outer end of the permanent magnet of the outer printing mechanism. A printing device characterized by: