JP3897210B2 - Dot line printer - Google Patents

Description

[0001]
[Industrial application fields]
In the present invention, a hammer bank holding a plurality of spring-charged dot printing hammers arranged side by side along a plurality of dot lines in the row direction is reciprocated along the row direction, and dot rows are printed in the process of this reciprocation. It relates to a dot printer.
[0002]
[Prior art]
Hereinafter, a conventional technique will be described with reference to FIGS.
[0003]
5 and 6 show examples of side views of the hammer mechanism.
[0004]
In FIG. 5, the printing hammer constituted by the leaf spring 35 and the printing pin 36 is held at the non-printing position by the magnetic attraction force of the magnet 2, and a release current having a predetermined pulse width is supplied to the release electromagnetic coil 37. Thus, in the spring charge type printing hammer which performs the release flight and prints, in order to store the printing energy in the leaf spring 35, a predetermined deflection amount δ1 is given. For this purpose, the adjustment screw 9 is pushed in, and the deflection amount δ1 is adjusted for each printing pin via the adjustment plate 40 and the rear plate 41.
[0005]
Here, in the hammer mechanism portion having a single bank structure as shown in FIG. 5, since the comb yoke 31 is mounted horizontally and a mounting area of the adjustment plate 40 is sufficiently secured, the shape of the adjustment plate 40 is also flexible. It was possible to make adjustment possible with a simple shape.
[0006]
However, the above-described single-bank structure hammer mechanism has a limit in increasing the printing speed, and in order to increase the printing speed, it is necessary to increase the mounting density of the printing hammer. In addition, the single bank structure has a limit in increasing the mounting density, which is not a good idea.
[0007]
Therefore, as shown in FIG. 6, it is necessary to mount 180 DPI (dot / inch) or 160 DPI pitch hammer mechanism portions in two upper and lower stages. In the figure, in order to mount the hammer mechanism portion in two upper and lower stages, the comb yoke 1 is arranged obliquely, and the heat radiation area of the cooling fin 12 is sufficiently secured, and the plate is used to increase the printing speed. It is necessary to shorten the drive length of the spring 5 as much as possible and increase the spring constant.
[0008]
[Problems to be solved by the invention]
For the above reasons, in the upper and lower two-stage bank structure, the adjustment plate 24 has a shape that matches the mounting space as shown in FIG. 6, and thus the mounting space for the adjustment plate 24 that is sufficiently secured in the single bank structure. Compared to, the space becomes extremely narrow. Therefore, when the adjustment screw 9 is pushed in and a predetermined initial deflection amount δ1 is to be secured, an excessive tensile stress is exerted on the sharp bend R portion of the adjustment plate 24, and for example, the amount of deflection is static. Even if δ1 can be secured, the deflection amount δ1 decreases as printing is repeated, and a problem arises that a predetermined print quality cannot be secured.
[0009]
Accordingly, an object of the present invention is to alleviate the stress generated in the adjustment plate by eliminating the drawbacks of the prior art described above, to secure a stable amount of deflection δ1 of the leaf spring, and to ensure printing with stable quality. There is.
[0010]
[Means for Solving the Problems]
The configuration of the present invention that solves the above-described problems includes a leaf spring and a printing pin, and a plurality of dot printing hammers arranged at a predetermined pitch along a printing line, and the printing hammer is held at a non-printing position. A magnet means for generating a magnetic attraction force, and a deflection amount adjustment mechanism comprising an adjustment plate and an adjustment screw provided to store a predetermined printing energy in the printing hammer and to adjust the deflection amount of the leaf spring. And a release electromagnetic coil provided corresponding to each printing hammer for driving the printing hammer and supplied with a pulse current of a predetermined width to cancel the magnetic field of the magnet means, and holds the printing hammer. In a dot printer comprising a hammer bank that reciprocates along a direction, and printing by driving each printing hammer in the process of reciprocating movement of the hammer bank, Serial adjustment plate, since the adjusting screw pushing portion and the plate spring contact portion is a bent shape that is disposed across the sharp bending R portion, to relax the stress applied to the sharp bending R portion of the adjusting plate, wherein The thickness of the predetermined area of the leaf spring contact portion is made thinner than the other areas.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a side view of a hammer mechanism of the present invention. The printing hammer includes a comb yoke 1, a yoke base 3, a front yoke 4, a magnet 2 that generates magnetism, and a printing pin 6 that controls printing. A leaf spring 5 for storing printing energy as a spring deflection, an adjustment screw 9 for giving a predetermined deflection amount δ1 to the leaf spring 5, an adjustment plate 20 for transmitting the force of the adjustment screw 9 to the leaf spring 5, The rear plate 11 and the magnet 2 are made up of a release electromagnetic coil 7 for canceling the magnetism, flying the leaf spring 5 and forming dots by the printing pins 6.
[0013]
FIG. 2 is a perspective view showing the main part of the initial deflection mechanism, and FIG. 3 is a side view of the adjustment plate 20.
[0014]
As shown in FIG. 3, a groove portion 21 is provided on the outer surface of the adjustment plate 20, and the stress generated in the adjustment plate 20 when the adjustment screw 9 is pushed in is generated in the tensile stress generated in the R portion and in the groove portion 21. The structure is such that it is dispersed in the compressive stress and does not concentrate on the R portion.
[0015]
The shape of the groove portion 21 in the present invention is a trapezoidal shape having a depth of 0.3 mm, a width of 1 mm, and 1.6 mm and corners connected by R0.1 and R0.3 mm with respect to a plate thickness of 0.8 mm of the adjustment plate 20. It is said. As a result, a predetermined initial deflection amount δ1 can be secured even in the high-density mounting hammer mechanism.
[0016]
In the above example, as a method of relieving the stress of the adjustment plate 20, the groove portion 21 is added to the outer surface side of the adjustment plate 20, but a groove is formed on the inner surface side opposite to the adjustment plate 23 shown in FIG. In the case of adding 25, or as shown in the adjustment plate 22, the same effect can be obtained by changing the plate thickness of the adjustment plate with a shape having R in the middle instead of the groove shape on the inner surface side.
[0017]
【The invention's effect】
As described above in detail, according to the present invention, when the initial deflection adjustment mechanism is mounted in an area where the mounting space is narrow, the plate thickness of the predetermined region of the plate spring contact portion of the adjustment plate is made thinner than other regions. The stress can be dispersed without concentrating in a part, the stress can be relieved as a whole, and a stable print quality can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of an upper and lower bank structure according to the present invention. FIG. 2 is a perspective view showing an example of a deflection adjustment mechanism according to the present invention. FIG. 3 is a side view of an adjustment plate as an example of the present invention. FIG. 4 is a side view of an adjustment plate as another example of the present invention. FIG. 5 is a side view showing a conventional single bank structure. FIG. 6 is a side view showing a conventional upper and lower bank structure.
1 and 31 are comb yokes, 2 is a magnet, 3 and 33 are yoke bases, 4 and 34 are front yokes, 5 and 35 are leaf springs, 6 and 36 are printing pins, 7 and 37 are coils, 9 is an adjustment screw, 20 22, 22, 23, 24, 40 are adjustment plates, 11, 41 are rear plates, 12, 42 are cooling fins, 21, 25 are grooves added to the adjustment plate, and δ 1 is a deflection amount of the leaf spring.

Claims (1)

A plurality of dot printing hammers, which are constituted by a leaf spring and a printing pin and arranged at a predetermined pitch along a printing line, and a magnet means for generating a magnetic attraction force for holding the printing hammer at a non-printing position A deflection amount adjusting mechanism including an adjustment plate and an adjusting screw, which is provided to store a predetermined printing energy in the printing hammer and adjust a deflection amount of the leaf spring, and to drive the printing hammer. Provided corresponding to the printing hammer, provided with a release electromagnetic coil that is supplied with a pulse current of a predetermined width and cancels the magnetic field of the magnet means, and has a hammer bank that holds the printing hammer and reciprocates in the row direction. In the dot printer for driving and printing each printing hammer in the process of reciprocating movement of the hammer bank,
The adjustment plate has a bent shape in which an adjustment screw push-in portion and a leaf spring contact portion are arranged with an acute angle bending R portion interposed therebetween, in order to relieve stress applied to the acute angle bending R portion of the adjustment plate, A dot printer characterized in that a plate thickness of a predetermined region of the leaf spring contact portion is made thinner than other regions.

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