JP3501186B2 - Dot line printer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reciprocates a hammer bank, which holds a plurality of spring-charged dot printing hammers arranged side by side in the row direction, in the row direction. The present invention relates to a dot line printer that prints lines.

[0002]

2. Description of the Related Art As shown in FIG. 1, a leaf spring-shaped printing hammer is held at a non-printing position by, for example, a magnetic attraction force of a magnet 2, and a release electromagnetic coil 7 (hereinafter simply referred to as a coil) releases a predetermined pulse width. In a ribbon separator of a spring-charge type printing hammer, which prints on a printing paper (not shown) by releasing the flying of the printing hammer by supplying an electric current, for example, as shown in FIG. The centers of the ribbon separator holes were concentric.

[0003]

However, the above-mentioned conventional dot line printer has the following problems.

As the printing speed increases, the printing hammer drive cycle increases, and as a result, when the number of hits per unit time increases, the running resistance of the ink ribbon that is hit increases and the movement of the ink ribbon deteriorates. As shown in FIG. 4, the resistance of the printing pin during printing causes the ink ribbon to try to move downward. As a result, resistance is also applied to the ribbon separator, and the hole of the ribbon separator and the center of the printing pin are displaced as shown in FIG.

On the other hand, when the feeding direction of the ink ribbon is opposite to that shown in FIG. 4 as shown in FIG. 7, the resistance of the printing pin during printing causes the ink ribbon to move upward. As a result, resistance is also applied to the ribbon separator, and the hole of the ribbon separator and the center of the printing pin are displaced as shown in FIG.

When the deviation shown in FIGS. 6 and 8 is severe, the printing pin hits the portion of the ribbon separator where the hole is not opened, so that the printing pin does not have ink on the printing paper. There has been a problem that defects such as damage occur and print quality deteriorates.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to always ensure that the print pin and the hole face each other even when the drive cycle of the print hammer is increased to prevent the print quality from deteriorating.

[0008]

In order to achieve the above-mentioned object, the present invention is characterized in that the center of each printing pin and the center of the hole are shifted in advance in a direction in which they are displaced from each other.

The amount of displacement of the hole facing the print pin of the ribbon separator may be gradually increased toward the central portion of the ribbon separator. Or
It is preferable to shift only the hole near the center of the ribbon separator.

[0010]

According to the above construction, since the ribbon separator and the pin can always be kept facing each other even if the printing hammer driving cycle is increased due to the increased printing speed, the deterioration of the printing quality can be eliminated.

[0011]

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a printing hammer according to the present invention. The printing hammer comprises a yoke 1 forming a magnetic circuit, a yoke base 3, a front yoke 4, a magnet 2 for generating magnetism, and a printing pin for controlling printing. 6, a leaf spring 5 for storing printing energy as a spring deflection, a coil 7 for canceling the magnetism of the magnet 2 and causing the leaf spring 5 to fly to form dots by a printing pin 6, an ink ribbon 8 as a printing medium, A ribbon separator 9 for preventing the ink of the ink ribbon 8 from being inadvertently transferred to printing paper.
It is composed of

In the above construction, as shown in FIG. 2, the hole position of the ribbon separator 9 in the central portion is shifted from the position of the printing pin 6 by ΔL to the downstream side in the sheet conveying direction.

Therefore, as shown in FIG. 4, the ink ribbon 8
The ink ribbon 8 drops downward due to the resistance of the printing pin 6 during printing due to the running of the
Even if the ribbon separator 9 that is in contact with is also lowered, it is shifted in anticipation of ΔL in advance.
There is no serious misalignment of cores as in the past.

On the other hand, as shown in FIG. 7, the running of the ink ribbon 8 causes the resistance of the printing pin 6 during printing to raise the ink ribbon 8 upward, and the ribbon separator 9 in contact with the ink ribbon 8 is also raised. If it occurs, the center of the ribbon separator 9'is displaced by .DELTA.L from the position of the print pin 6 toward the upstream side in the sheet conveying direction as shown in FIG.

[0016]

As described in detail above, according to the present invention,
Since the design dimension is determined in advance by taking into account the positional deviation of the ribbon separator 9 that occurs during printing, even if deviation occurs, it is possible to reduce the degree of influence on the fluctuation, and to achieve high printing quality dot lines. You will be able to provide a printer.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a printing hammer used in a dot line printer of the present invention.

FIG. 2 is a front view of the ribbon separator of the present invention.

FIG. 3 is a front view during printing of FIG.

FIG. 4 is a front view showing a running state of the ink ribbon.

FIG. 5 is a front view showing a conventional ribbon separator.

FIG. 6 is a front view during printing of FIG.

FIG. 7 is a front view showing a running state of the ink ribbon.

FIG. 8 is a front view showing a conventional ribbon separator.

FIG. 9 is a front view showing another embodiment of the present invention.

FIG. 10 is a front view showing the state shown in FIG. 9 during printing.

[Explanation of symbols]

1 is a yoke, 2 is a magnet, 3 is a yoke base, 4 is a front yoke, 5 is a leaf spring, 6 is a printing pin, 7 is a coil, 8 is an ink ribbon, 9 and 19 are ribbon separators,
Reference numeral 10 denotes a ribbon separator fixing portion.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-109012 (JP, A) Actually open 60-162059 (JP, U) Actually open 58-157653 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B41J 2/25 B41J 2/28 B41J 11/62 B41J 35/04

Claims (2)

(57) [Claims] 1. A plurality of printing hammers each of which is composed of a leaf spring and a printing pin and arranged side by side at a predetermined pitch along a printing line, and a magnetic suction force for holding the printing hammers at a non-printing position. A magnet means for generating, a release electromagnetic coil provided corresponding to each print hammer for driving the print hammer, supplied with a pulse current of a predetermined width to cancel the magnetic field of the magnet means, and the print hammer. A hammer bank that holds and reciprocates along the row direction, and an ink ribbon and a ribbon separator for preventing transfer of the ink to the printing paper are provided between the hammer bank and the printing paper provided opposite thereto. A dot line printer for driving and printing each of the printing hammers in the course of the reciprocating movement of the hammer bank, the hole facing the printing pin of the ribbon separator, Provided staggered with respect to the center of the printing pins, said toward the central portion of the ribbon separator, a dot line printer, characterized in that the shift amount of the hole was gradually increased. 2. The dot line printer according to claim 1.
The dot line printer is characterized in that a hole facing the print pin of the ribbon separator is provided by displacing only a hole near the center of the ribbon separator with respect to the center of the print pin.