JPH0318190Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring charge line printer print head.

Figure 1 shows an embodiment of a conventional spring charge type line printer print head, in which a magnetic yoke 3 with a degaussing coil 2 wound around one magnetic pole of a permanent magnet 1 is connected to the other magnetic pole. A magnetic base 4 is coupled and a magnetic hammer spring 6 provided with a hammer pin 5 is fixed to the end 4a of the base 4 with a fixing plate 7.

In FIG. 1, the hammer spring 6 is connected to the permanent magnet 1.
The drawing shows a state in which the tip 3a of the yoke 3 is attracted and deflected by the suction force of the hammer spring 6, and therefore the energy of the deflection is stored inside the hammer spring 6.

Now, when the degaussing coil 2 is energized to cancel the attractive force of the permanent magnet 1 that has been deflecting the hammer spring 6, the hammer spring 6 will fly to the left due to the energy of the deflection.

As a result, the tip of the hammer pin 5 collides with the platen 10 via the ink ribbon 8 and the printing paper 9, so that a dot is printed on the printing paper 9.

Furthermore, when the current to the degaussing coil 2 is cut off, the hammer spring 6 is pulled back by the attractive force of the permanent magnet 1, returning to the state shown in FIG. 1 again.

By repeating printing of points as described above while moving the printing paper 9 and the printing head as a whole, characters or figures can be expressed as a combination of points.

However, in such conventional print heads, when the hammer pin collides with the platen, the hammer spring bends further toward the printing surface, which increases the time the hammer pin and platen are in contact, which hinders high-speed operation. There is. This will be explained in detail with reference to the operation diagrams of the hammer spring shown in FIGS. 2a, b, c, d, e, and f.

In FIG. 2a, the degaussing coil 2 is not energized, and the hammer spring 6 is attracted to the yoke tip 3a and is bent.

When the degaussing coil 2 is energized from this state, the hammer spring 6 jumps to the left due to the energy of the deflection, as shown in FIG. 2b.
The hammer pin 5 provided at the platen collides with the platen 10. The current flowing to the degaussing coil 2 is the hammer pin 5.
cut at an appropriate time until it collides with the platen 10. After the hammer pin 5 collides with the platen 10, the midsection of the hammer spring 6 bends into a dogleg shape, as shown in FIG. 2c.

Thereafter, as shown in FIG. 2d, the hammer spring 6 becomes straight with the hammer pin 5 in contact with the platen 10, and is bent into a ">" shape as shown in FIG. 2e. Then, while repeating the vibrations as shown in FIG. 2c, d, and e, the hammer spring 6 returns to its original state as shown in FIG. 2f, where it is again attracted to the yoke tip 3a.

Further, the relationship between the displacement of the midsection of the hammer spring 6 and time is shown in FIG. 3, and the hammer pin 5 vibrates after colliding with the platen 10.

As mentioned above, the conventional print head has hammer pin 5.
After colliding with the platen 10, the hammer spring 6 bends in the shape of a "<", which lengthens the contact time between the hammer pin 5 and the platen 10, and also causes the hammer spring 6 to vibrate, which hinders high-speed operation. Ta.

An object of the present invention is to provide a print head that shortens the contact time between the hammer pin and the platen and is capable of high-speed printing.

According to the present invention, a spring charge type line printer print head is obtained in which a cushioning material is arranged on the printing surface side of a hammer spring.

The present invention will be described below with reference to drawings showing embodiments.

FIG. 4 shows an embodiment of the present invention, in which a magnetic yoke 3 around which a degaussing coil 2 is wound is connected to one magnetic pole of a permanent magnet 1, a magnetic base 4 is connected to the other magnetic pole, and a hammer pin 5 is connected to the other magnetic pole. In a print head in which a magnetic hammer spring 6 is fixed to a base 4, a plate 12 covered with a cushioning material 11 such as urethane rubber is attached to the printing surface side of the hammer spring 6, that is, the side where the hammer pin 5 is located, on the fixing plate 7. They are stacked from above and fixed to the base end 4a. When the hammer pin 5 collides with the platen 10, the cushioning material 11 is located in the middle of the hammer spring 6, that is, when the hammer pin 5 collides with the platen 10.
Place it so that it touches the part that is going to bend in the shape of a .

Figures 5a, b, c and d show the operation of the hammer spring of the print head of the present invention.

In FIG. 5a, the degaussing coil 2 is not energized, and the hammer spring 6 is attracted to the yoke tip 3a and is bent. From this state, degaussing coil 2
When the hammer spring 6 is energized, the energy of the deflection causes the hammer spring 6 to fly out to the left and the hammer pin 5 provided on the hammer spring 6 collides with the platen 10, as shown in FIG. 5B. The current flowing to the degaussing coil 2 is cut off at an appropriate time until the hammer pin 5 collides with the platen 10.

After the hammer pin 5 collides with the platen 10, the hammer spring 6 tries to bend in the shape of a "<" like a conventional printing head, but because of the cushioning material 11, the energy that tends to bend in the shape of a "<" is absorbed. Most of it is absorbed by the cushioning material 11 (Fig. 5c), and the hammer spring 6 does not bend in the shape of a "<".
Therefore, it is sucked back into the yoke tip 3a without vibrating and returns to its original state (FIG. 5d).

FIG. 6 shows the relationship between the displacement of the midsection of the hammer spring 6 of the present invention and time, and it can be seen that there is no vibration as in the case of the conventional print head (FIG. 3).

As mentioned above, in the case of the present invention, the hammer spring does not bend in the shape of a "<" after the hammer pin collides with the platen, unlike in conventional printing heads, so the contact time between the hammer pin and the platen is shortened, and the hammer spring also High-speed drive is possible because there is no vibration.

FIG. 7 shows another embodiment of the present invention, in which a magnetic yoke 3 around which a degaussing coil 2 is wound is connected to one magnetic pole of a permanent magnet 1, a magnetic base 4 is connected to the other magnetic pole, and a hammer pin is connected. 5 is fixed to the base 4, and a side yoke 13 made of a magnetic material is installed in the space between the adjacent hammer springs 6 from the fixed end of the hammer spring 6 in parallel to the hammer spring 6. In a spring charge type line printer print head having a structure in which a shock absorber 14 is installed in a space between side yokes 13 adjacent to each other on the printing surface side of the hammer spring 6. The above-mentioned idea of the present invention is similarly applied to a print head having such a structure.
A similar effect can be obtained.

FIG. 8a shows still another embodiment of the present invention, in which a magnetic yoke 3 around which a degaussing coil 2 is wound is connected to one magnetic pole of a permanent magnet 1, and a magnetic base 4 is coupled to the other magnetic pole. A hammer spring 6 made of a magnetic material provided with a hammer pin 5 is fixed to the base 4, and side yokes 13 made of a magnetic material are provided in parallel to the hammer spring 6 from the fixed ends of the hammer springs 6 adjacent to each other. In a spring charge type line printer print head having a structure in which a mask 13 is disposed on the printing surface side, a cushioning material 16 is attached to the hammer spring 6 side of the mask 15. The cushioning material 16 is placed in a space between the side yokes 13 adjacent to each other on the printing surface side of the hammer spring 6. FIG. 8b shows a front view and a side view of the mask 15 to which the cushioning material 16 is attached. The above-mentioned idea of the present invention can be similarly applied to a print head having such a structure, and similar effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a conventional spring charge type line printer print head, and FIGS. 2 a, b, c, d, e, and f are diagrams showing the operation of the hammer spring of the conventional print head. Fig. 3 is a diagram showing the relationship between the displacement of the midsection of the hammer spring of a conventional print head and time, Fig. 4 is a diagram showing an embodiment of the present invention, and Figs. Figure 6 showing the operation of the hammer spring of the invented print head.
The figure shows the relationship between the displacement of the midsection of the hammer spring of the print head of the present invention and time, Figure 7 shows another embodiment of the invention, and Figure 8 shows yet another embodiment of the invention. FIG. 1... Permanent magnet, 2... Demagnetizing coil, 3... Yoke, 4... Base, 5... Hammer pin, 6...
Hammer spring, 7... Fixed plate, 8... Ink ribbon, 9... Print paper, 10... Platen, 1
1...Buffer material, 12...Plate, 13...Side yoke, 14...Buffer material, 15...Mask, 16...
Buffer material.

Claims (1)

[Scope of utility model registration request] A hammer spring is attracted and deflected by the attractive force of a permanent magnet, and when printing, a degaussing coil is energized to cancel the attractive force of the permanent magnet and release the hammer spring. In a spring charge type line printer print head that performs impact printing with a hammer pin, a cushioning material is arranged on the print surface side of the hammer spring so that it comes into contact with the midsection of the hammer spring when the hammer pin collides with the print surface. A spring charge type line printer print head characterized by: