JPS582005A - Magnet starting control - Google Patents

Abstract

PURPOSE:To enable smooth starting of a magnet, by flowing current of a frequency where the magnet does not respond in a coil while the magnet is inoperative. CONSTITUTION:High-frequency current i flows in a coil 2 for a time T1 and a period T2, while a wire dot printer stops print-driving. The time and perid are determined by thermal quantity produced at an inoperative frequency of a magnet. Then, a core 1 is warmed by heat produced within the coil 2 and by eddy current in the core 1. Oil film in the contact surface between the core 1 and an armature 3 gets hot and decreases in viscosity. Such a status enables smooth starting, when a printing magnet 21a starts at a normal drive current. The starting will be made possible in a short time during a cold season on the condition that weak current i flows in the coil 2 of printing magnet 21a for the time T1 and peroid T2 as soon as the wire dot printer is powered ON.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic screw (K) used in a print head for a wire tod printer, and particularly to a method for improving its startup.

Printers that pattern/form characters, etc. by a collection of dots formed by a printing wire are often used for characters, and are extremely suitable and economical for applications requiring copying. In order to improve printing quality, it is necessary to make the wires thinner and increase their number so that each wire can operate independently. Recently, open type magnets have been used in print heads for printers of this type from the viewpoint of downsizing and reducing power consumption.The conventional method will be explained with reference to FIGS. 1 and 2.
FIG. 1 is a plan view illustrating a wire tod printer to which the present invention is applied, and FIG. 2 is a side view showing a print magnet portion of the print head of FIG. 1.

In the figure, 1 is a core, 2 is a coil, 3 is an armature tool, 4 is a holding part, 5 is a printing wire, 6 is a support spring, 7a, Tb are side magnetic path parts, 8 is a magnet, 9 is a frame, 10 is platen, 1
1 company printing medium, 12a and 12b are sprockets, 13 is a carrier, 15 is a guide shaft, 16 is a feed screw, 1
7 is a belt, 19 is a motor, 20 is an ink ribbon cassette, 20 is an ink ribbon, 21 is a print head, and 21 is a print magnet.

As shown in FIG. 1, the wire tod printer has a frame 9, on which a platen 1G is rotatably supported. −? Deen 1$ Rotatably supported i
At cL, a print medium 11 is wound around the platen 10, and the medium 11 is sent in the direction indicated by the arrow in the figure by sprockets 12m, 12b, etc. On the other hand, on the front side of the platen 10, that is, in the lower part of the figure, a carrier 13 is slidably fitted into a guide shaft 15 provided parallel to the platen 10; It is threadedly engaged with the feed screw 16.

The feed screw 16 is connected to a motor 19 via a belt 17, etc., and the feed screw 16 is rotated forward and backward by the motor 19.
You can move it in the D direction. The ink ribbon cassette 20 is mounted on the carrier 13, and the cassette 2
An endless ink ribbon 20a is built into the printer 0 with a portion thereof exposed above the platen 10. In addition, the print head 21 is installed in the printer 13, and the print head 21 is installed in the printer cassette 2.
The print head 21 is provided with a plurality of print magnets 21 for forming prints using dots. Normally, 16 to 24 printing magnets 21a+ are provided.

21m is the core IV as shown in Figure 2.
The core 1 is wound with an armature 2), and an armature armature 3 is arranged so as to come into contact with the core 1. A holding part 5 to which a printing wire 4 is fixed is attached to the tip of the Amachi Tamea 5KFi, and the Amachi Toa 3 is elastically supported by a support spring 6. One end of the n1 support spring 6 is fixed to the side magnetic path part 7aK. has been done. The side magnetic path portions 7m and 7b are arranged so as to sandwich the magnet 8 therebetween and surround the core l and the armature shaft 3 in a U-shape. 9. If the printing magnet is not working,
The armature 3 is attracted to the core 1 by the magnetic force of the magnet 8.

With this configuration, if current is applied to the coil 2 of the print magnet 21m of the print head 21 so that the N8 pole of the magnet 8 and the pole of the core l are opposite, the core l becomes an electromagnet, and the magnet 8's pole becomes an electromagnet. Overcoming the suction power 9 is amazing ^
A 3 flies toward the side magnetic path portion 7a, that is, upward in FIG. 2, and then the printing wire 4 also protrudes in the direction of arrow E in the drawing, and the ink ribbon 208 is attached to the printing medium 11 on the platen 10 shown in FIG. When the coil 2, which is used for printing, is de-energized, the electromagnetic force of the core 1 also disappears, and the armature holder 3 returns to the core 1 side due to the elasticity of the support spring 6, and due to the attractive force of the magnet 8, It moves in the direction of arrow F in FIG. 2, attracts the core IK, and returns to the standby position. In this way, the plurality of printing magnets 2 in the door 21 are used for printing.
1 m selectively, the print head 21 is moved together with the carrier 13 in the directions of arrows C and D, as shown in FIG. 1, to perform a printing operation on the print medium 11. Moreover, the printing speed is high-speed printing of 10'G to 200 characters per second. When the printing magnet 21a is returned by conventional printing drive, the armature wire 3 hits the surface of the core 1, and the surface of the core 1 is worn out, which increases the movement stroke of the printing wire 4, which is preferable in terms of printing quality. It had the drawback of being dangerous. As a countermeasure to this problem, a method was taken to apply oil to the contact surface between the core 1 and the armature 3, but when you start using a wired tattoo printer, the contact surface between the core 1 and the armature crystal 3 becomes sticky due to the viscosity of the applied oil. In other words, there is a drawback that the amachi blower 3 does not operate normally. This problem is especially noticeable after a temporary hiatus during the cold season, so countermeasures have been desired.

The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a method and method suitable for starting a print head for a wire tod printer.
is to provide.

The present invention provides a magnet composed of a coil, a core wound with a skeleton coil, an amateur chair abutting the core and elastically supported by a spring, when the printing magnet is not activated. , is a magnet activation control method characterized in that a current having a frequency at which the magnet does not operate is caused to flow through the coil.

This allows the magnet to start normally.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 3 shows a tie diagram for energizing the fill. In FIG. indicates the current value. When the printing drive of the wire dot printer is stopped, a high-frequency current is applied to the coil 2 shown in FIG. 2 with a current flow time T1 and a current flow period T as shown in FIG. This time and period are determined by the amount of heat generated at a frequency at which the magnet cannot operate. Then, the core l is warmed by the heat generated inside the coil 2 and the heat generated by the eddy current of the core 1, and the temperature of the oil film sandwiched between the contact surface of the core 1 and the amateur chair 3 rises. Viscosity decreases. If the printing magnet (21m) is activated in this state with a regular drive current, smooth activation is possible. Now, when you turn on the wire tod printer, if you immediately make a weak current i flow through the coil 2 of the printing magnet 21m with the energization time T1 and the energization cycle T, you can use the wire tod printer in the morning during a cold season, for example. When you start, you can start it up in a short time.

As explained above, according to the present invention, even if balm oil is applied to reduce wear on the contact surface between the core of the printing magnet and the aperture magnet, the viscosity of the lube is lowered when the print head drive body stops. This has the effect of allowing normal startup.

In the embodiment, the release type magnet (K) was explained, but other magnets can also be used at the same time.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view illustrating a wire tod printer to which the present invention is applied, FIG. 2 is a side view showing the printing magnet section of the print head of FIG. 1, and FIG. 3 is a plan view illustrating the present invention. The timing diagram for energizing the coil is shown. In the figure, 1 is the core, 2 is the coil, 3 is the armature,
4 is a print wire, 8 is a magnet, 10 is a platen, 11 is a print medium, 21 is a print head, 21m is a print magnet, i is a current, T1 is a current application time, and TI is a current application period. Chilρ Figure 2 Voice Figure 3

Claims (1)

[Claims] A coil, a core around which the coil is wound, and an amateur chair that abuts the core and is elastically supported by a spring.
1. A magnet starting control method, characterized in that when the magnet is not activated, a current having a frequency to which the magnet does not respond is passed through the coil.