JPH0245003Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a printing hammer in a printer that outputs data processed by a computer or the like.

BACKGROUND ART In a dot impact printer, dot matrix type characters are recorded, and this pattern is formed by signals from a character generator built in a control circuit.

A printer consists of a hammer bank in which printing hammers are arranged horizontally in a row, a shuttle mechanism that swings the printing hammers horizontally at a constant amplitude, a paper feed mechanism, etc. Each printing hammer operates while the hammer bank swings. Since the dots are marked at regular intervals, a one-way operation creates a horizontal row of dots. Then, when folding the paper, the paper is advanced slightly and the next row of dots is printed.

The printing hammer is an extremely important component in this type of dot impact printer, and various efforts have been made to increase response speed and extend the life of the hammer pin. Increasing the hardness of the pin material makes processing the pin itself difficult and expensive. In addition, even if a slightly soft material is used and the surface is hardened after processing, there are problems in terms of life. This increased the number of man-hours and was not suitable for mass production.

This will be explained in detail with reference to FIGS. 1 to 4.
In FIG. 1, 10 is a hammer bank, 5 is a platen, 6 is paper, and 7 is an ink ribbon.While the hammer bank 10 is oscillated by a shuttle mechanism (not shown), a printing hammer in the hammer bank operates. Characters are printed on paper 6 on platen 5 by passing ink ribbon 7 through pin 2 fixed to the tip of leaf spring 1. The tip of the pin has a diameter of 0.2 to 0.3 as shown in FIGS. 2 to 4. It is extremely thin (mm) and prints on paper through an ink ribbon or carbon paper, so it is 0.3~
In addition to requiring a length of 0.5 mm, it must be made slightly longer when considering wear.
The materials used for the pins are limited, or a carbide tip is fixed only at the tip, but the shape of the pin is complicated, making it difficult to ensure dimensional accuracy, and it takes a lot of man-hours to make high-precision characters with 16 pins and 24 pins. When printing, a lot of production costs are required, leading to an increase in the overall cost of the printer.

Furthermore, if only the tip part is finished to the specified dimensions and the base part is made thicker, it is possible to prevent the pin from being damaged by impact during printing, but this increases the weight and has the disadvantage that it affects the response speed of the leaf spring, making high-speed printing impossible.

DISCLOSURE OF THE INVENTION The object of the present invention is to eliminate such drawbacks and provide an inexpensive printing hammer that is simple in shape, easy to process, and resistant to wear.

In order to achieve this purpose, the present invention includes a reversible symmetrical leaf spring, a central pin, and a pin inserted so that both ends of the pin protrude by a predetermined amount, and arranged around the pin. The hammer is constituted by a pipe which is fixed through the leaf spring.

According to the present invention, the pins and pipes can be made by pultrusion, many can be cut at the same time, dimensional accuracy can be easily ensured, and the pins and pipes can be held on a leaf spring with a simple jig.
Pin positioning accuracy can be easily and accurately achieved by brazing or resistance welding.
There is also less noise, and in particular with regard to wear, the pins need only be made harder, and even if one of the pins in one leaf spring breaks, it can be reversed. In addition, the shape of the pin and pipe is simple, and the hammer is lightweight and strong.

BEST MODE FOR CARRYING OUT THE INVENTION FIGS. 5 to 7 show an embodiment of the invention. In FIGS. 5 to 7, the same parts as in FIGS. 1 to 4 are denoted by the same reference numerals, and explanations thereof will be omitted. What is new is the hammer pin. Hammer pin is pin 3 and pipe 4
It consists of The pin 3 is a thin rod made of ultra-hard material such as tungsten with a diameter of 0.3 ± 0.01 and has a length of 2a + t.The reinforcing pipe 4 is made of iron and has an outer diameter of 1.0 x inner diameter of 0.3 x length of 2b + t.
After inserting the pin 3 into the pipe 4 using Insert the hammer pin into the mounting hole 11 of the spring 1, adjust the protrusion amount of the hammer pin to a on both sides, and fix it by brazing or resistance welding. In addition to the above, the assembly order of these printing hammers is such that even if the leaf spring 1 and the pipe 4 are first fixed with the protrusion amount b, and then the pin 3 is inserted into the pipe 4 and fixed, the dimensional accuracy and mounting position accuracy will not be ensured. It's not a thing. The pins and pipes can be easily secured to the specified dimensional accuracy by pultrusion processing without machining, and the lengths can be cut at the same time in large numbers, and the mounting position accuracy on the leaf spring can be adjusted using a simple jig. In addition to ensuring pitch, squareness, and parallelism, the tip is lighter, there is less wear on the yoke and leaf spring during printing impact of the hammer, noise is reduced, and response speed is increased. There is no need for replacement parts even when the tip wears or breaks.
It has many effects, such as just reversing the leaf spring, and one sheet can be used as a printing hammer for two sheets.

[Brief explanation of drawings]

Figure 1 is a mechanical principle diagram of the printer, Figures 2 and 3
Figures 4 and 4 are a front view, a side view, a sectional view taken along the line A-A in Figure 2, and Figures 5, 6, and 7 of a conventional printing hammer.
The figures are a front view, a side view, and a sectional view taken along the line BB in FIG. 5 of a printing hammer according to an embodiment of the present invention. 1 is a leaf spring, 2 and 3 are pins, 4 is a pipe,
5 is a platen, 6 is paper, 7 is an ink ribbon, 1
0 indicates a hammer bank, and 11 indicates a mounting hole for a leaf spring.

Claims (1)

[Scope of utility model registration request] In a printing hammer for a printer in which an embossing pin is fixed to the tip of a leaf spring, the pin is fitted into a pipe and fixed with both ends slightly protruding from the pipe, and the pipe is fixed through the leaf spring. Printing hammer for printers with special features.