JPS58224768A - Printing hammer device - Google Patents

Abstract

PURPOSE:To obtain a low-cost printing hammer device capable of giving excellent printing quality by using a system in which a long and round bearing hole is provided in an actuator and the actuator is operated by rotation and movement. CONSTITUTION:An oblong bearing hole 9 is provided in an actuator 3 in such a way that the longitudinal direction of the oblong form is nearly right-angled to the face of a type 71 in relation to a shaft 5. A current is flowed in a coil 2, the actuator 3 is turned to the left in relation to the shaft 5, and a hammer 4 is coolided against the type 71 through a printing paper 8. Even when the distance between the type 71 and the hammer 4 is larger than a proper value under the condition that no current is applied to the coil 2, the actuator 3 is further turned to the left by inertia even when an adsorption area comes into contact with a magnetic pole 11 and thereby printing can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a printing hammer device provided in an impact printer.

(Bl Technology background) Laser printers have recently been put into practical use and are rapidly becoming popular, but impact type printers have excellent features such as simultaneous copying, and are superior in terms of reliability and price. Therefore, it is thought that it will remain the mainstream printer for combiners for some time to come.

These various printers usually use a flying printing method, and the printing hammer device installed in this printer is
Structurally, there are two types: those that have a side structure of an actuator kneader that operates by electromagnetic action and a hammer that serves as a typeface, and those that have an integrated structure. Each type has its own characteristics, but they are generally inexpensive. For commercial purposes, those with a one-piece structure are often used.

(q Prior art and problems Figure 1 is a complete structural diagram of a conventional example of a printing hammer device in which the actuator and hammer are integrated, where l is a U-shaped yoke, and 2 is a yoke. A coil 3 is provided on the outer periphery of one of the magnetic poles 11 of 1, and a magnet 3 forms a closed magnetic circuit with an attracting part 31 and an opposing part 32. Together with the U-shaped yoke 1, it is supported by the shaft described below and is rotated by the electromagnetic action of the coil 2. 4 is a hammer provided at one end of the Akchenida 3, 5 is a shaft that supports the operation of the Akchenida 3, and 6 is a yoke l on which the suction part 31 of the Akchenida 3 is attached.
This is a spring that acts to move away from one of the magnetic poles 11.

Reference numeral 7 denotes a type bell 1-1--which runs in a direction perpendicular to the plane of the paper in the figure. Further, numeral 8 runs to the right in the diagram showing the printing paper assembly.

When no current is applied to the coil 2, the action of the spring 6 ensures a proper gap between the letters 71 arranged on the letter plate 7 and the /% nshima. Also, when a current is applied to the coil 2, the actuator 3
The attraction part 31 is attracted to one magnetic pole 11 of the yoke l, and the shaft 5
Rotate a certain angle to the left with respect to .

In the state where no current is applied to coil f and 2, type 71
The appropriate gap secured between the printer and the hammer 4 varies depending on the number of print sheets to be simultaneously copied. For this reason, although not shown in the drawings, a mechanism tube is provided for moving the entire printing nosima device relative to the character belt 7 and finely adjusting the distance Fl precisely.

As shown in the figure, in a typeface type impact type line printer, for example, 136 hammer devices are arranged in the running direction of the typeface type facet 7. It is extremely difficult to accurately adjust the entire gap between the 71 and 71, and this means that even if it is more or less than the appropriate value, the printing process key will not be fully utilized, and therefore, proper printing density will not be obtained. Also, if there is a small amount, there is a problem with so-called double-strike, which greatly degrades the print quality. It is occurring.

In order to completely eliminate such problems, methods are used such as machining the neck portion 33 of the actuator 1 into a shape and size that will cause appropriate elastic deformation. The turning radius is reduced and the type 7
The parallelism between the surface of the hammer 4 and the surface of the hammer 4 exceeds the permissible limit, resulting in so-called uneven contact 1, which tends to reduce the overall printing quality.

In any case, each part of the printing hammer device requires high processing precision, which is a major hindrance to cost reduction.

(1)) Purpose of the Invention Is the present invention a problem in the prior art described above? A 71-meter printing device that eliminates the problem, provides excellent print quality, and is inexpensive? The goal is to get C and money.

(Structure of the Invention: In order to achieve the above-mentioned object, printing according to the present invention) A hammer device operates an actuator by electromagnetic action, and a hammer is integrally provided at one end of the actuator. In a device that performs printing by driving, the actinita? The shaft bearing hole provided in the actuator kneader corresponds to the shaft to be supported and restrained, and the entire shaft bearing hole is circular in shape, and is operated by the rotation and movement of the actuator metal.

(F) Embodiments of the Invention Next, the gist of the present invention will be explained in detail with reference to one embodiment.

FIG. 2 shows a structural diagram of an embodiment of the present invention, and the symbols common to those of the conventional example in FIG. 1 are the same objects. In addition to that shown, 9 is an oval shaft bearing hole provided in the actuator 3 corresponding to the shaft 5.

The shaft 5 is provided at a position facing the other magnetic pole 12 of the yoke 1, and the shaft bearing hole 9 is provided so that the longitudinal direction of the oval shape is approximately perpendicular to the surface of the typeface 71.

Further, the spring 6 is positioned between the bearing hole 9 and the shim 4, and acts to separate the attracting portion 31 of the actuator 3 from one of the magnetic poles 11 of the yoke 2. For this reason, the acti kneader 3 has the shaft bearing hole 9 and the neck 33 all in the state shown in the figure, and the shaft 5 and the backstop l OK.
Let it touch and stand still. In addition, in this state, the type 7
In order to ensure an appropriate gap depending on the number of sheets of printing paper 8 to be copied between 1 and 1 stripes 4, the relative position of the entire print stripe device with respect to the type belt 7 must be adjusted in advance. Te(.

Next, when a current is applied to the coil 2, the attracting part 31 is attracted to one of the magnetic poles 11, the actuator 3 resists the spring 6 and rotates to the left about the shaft 5, and the 71 mm 4 passes through the printing paper 8 to print the type. It is desirable that printing occurs at the same time as the suction part 31 comes into contact with one of the magnetic poles 11. If the gap between the and hammer 4 is υ larger than the appropriate value,
As shown in FIG.
Even after contacting the actuator 1, the actuator 3 can further rotate to the left as a fulcrum point due to inertia as shown in FIG. 3 fbl, so that printing t2 can be performed.

Note that, as shown in FIG.
The radius of rotation of the hammer 4 until it comes into contact with the hammer 1 is rl,
The radius of rotation after this is r3, which is a much larger value than 2 in the case of utilizing the elastic deformation of the neck 33 in the conventional example.

Therefore, it is easy to maintain the parallelism between the surface of the typeface 71 and the surface of the hammer 4 within the permissible limit (therefore, it is possible to prevent deterioration of printing quality).

Further, such a structure allows the processing accuracy of the component parts to be increased or decreased, and therefore costs can be reduced.

(q) As described in detail, according to the present invention, it is possible to prevent deterioration of printing quality and to obtain an inexpensive printing hammer device.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a conventional printing hammer device, FIG. 2 is a structural diagram of an embodiment of the present invention, and FIGS. 3 and 4 are operation explanatory diagrams of an embodiment of the present invention. In these figures, 3 is an actuator, 4 is a hammer, 5 is a shaft, and 9 is a bearing hole. Akira 1 Tsukaya 2 Prisoner

Claims (1)

[Claims] The actuator is actuated by electromagnetic action, and a hammer integrally provided at one end of the actuary kneader is activated to print 8 characters.
Among these devices, the above-mentioned acti kneader? A printing hammer device characterized in that a shaft bearing hole provided in the actie kneader is formed into an oval shape corresponding to a shaft to be supported and restrained.