JPS6210195B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an impact type dot matrix printer comprising a plurality of dot printing elements.

A group of electromagnets for drive control, which are respectively engaged with each dot printing element, are normally arranged in one plane perpendicular to the main axis direction of the dot matrix printer (the direction of printing operation of the printing section provided at the front end of the dot printing element). Therefore, in order to increase the number of dot printing elements and obtain clear printing, it is necessary to arrange the electromagnets as densely as possible so that the volume of the dot matrix printer does not increase significantly. become. Therefore, the engagement positions between each movable piece of the electromagnet and each dot printing element are complicated at close distances, and as a result, the engagement parts are required to be even more compact and extremely precise, making it difficult to process parts and assemble them. It will be extremely difficult.

Therefore, the present invention forms the movable piece by bending it,
The above-mentioned disadvantages are solved by distributing each engagement position in the direction of the main axis of the dot matrix printer.

The following explanation will be based on an embodiment in which the present invention is applied to a dot matrix printer made of thin plate dot printing elements.Dot printing elements 1, 1, etc. made of thin plates are stacked in the thickness direction, and the front and rear edges are stacked. By fitting the guide bodies 5, 5 into the parts, a dot matrix printer is constructed as shown in FIG. In this case, the engaging portions 2, 2, . . . provided on each dot printing element.
are appropriately shifted from each other in the longitudinal direction of the dot printing elements 1, 1... so that the engagement positions of the movable pieces 41, 42... and the engaging portions 2, 2... are not concentrated at one location. For example, in FIG. 2 showing the AA cross section of FIG. 1, three dot printing elements 1, 1...
are formed as shown in FIGS. 3A, B and C, respectively. That is, the groups of electromagnets 3, 3, etc. that engage with each dot printing element 1, 1, etc. are arranged in one plane perpendicular to the main axis of the dot matrix printer, as shown in FIG. If the positions of the engaging parts 2, 2... are staggered, the movable pieces 41, 42... of the electromagnets 3, 3... are bent in order to engage with the corresponding engaging parts 2, 2..., respectively. It turns out. That is, the shape of the movable piece 41 shown in FIG. 3B is straight and similar to that conventionally used, but the shape of the movable piece 41 shown in FIG. 3A is
is provided closer to the rear end in the longitudinal direction of the dot printing element 1 than the engaging portion 2 in FIG. 3B, and the engaging portion 2 shown in FIG. 3C is located further away from the engaging portion 2 in FIG. Since it is provided on the front end side in the longitudinal direction of the printing element 1,
In the case of the electromagnets 3 and 3 shown in Fig. 3A and C,
The movable pieces 42 and 43 are each bent as shown. In this way, each engagement position is distributed in the direction of the main axis of the dot matrix printer, so that confusion in engagement positions is avoided.

Now, in the dot matrix printer formed in this way, when a specific electromagnet 3 receives a control current and is excited, a specific dot printing element 1 that engages with this electromagnet 3 performs a dotting operation on printing paper. become. Therefore, when the dot matrix printer moves under control in a direction perpendicular to the main axis, and each dot printing element 1, 1, etc. performs the above-mentioned dotting operation simultaneously or sequentially, the desired character is printed on the printing paper. etc. (including symbols, graphs, figures, etc.) will be printed by dots.

Although the above is an example of a dot matrix printer using a thin plate dot printing element, the present invention is also applicable to a dot matrix printer using a wire for the dot printing element.

Since the dot matrix printer according to the present invention is constructed as described above, even if the number of annularly arranged electromagnets increases as the number of dot printing elements increases, the engagement positions will not be complicated at close range. , it will not be difficult to secure the required engagement position. Further, in order to force the engagement position to be secured, the shape of the movable piece is not made extremely precise, thereby increasing the difficulty in machining the parts or making the assembly work difficult. Therefore, it is extremely easy to increase the number of dot printing elements in order to obtain sharp prints, and there is no risk of significantly increasing the volume of the dot matrix printer.

[Brief explanation of the drawing]

The figure shows the case where this invention is applied to a dot matrix printer in which the dot printing element is in the form of a thin plate.
Figure 1 is a perspective view of a dot matrix printer.
Figure 2 is a sectional view taken along the line A-A in Figure 1, Figure 3 A is a view taken in the direction of arrow A in Figure 2, Figure 3B is a view taken in the direction of arrow B in Figure 2, and Figure 3 C is a view taken in the direction of arrow B in Figure 2. C in the diagram
It is an arrow view. Explanation of symbols 1... Dot printing element, 2... Engaging portion, 3... Electromagnet, 41, 42, 43... Movable piece, 5
...Guide body, 6...Printing part.

Claims (1)

[Claims] 1. In an input type printer that prints by driving a dot printing element made of a laminated layer of thin plates with an engaging driving electromagnet, the movable piece of the electromagnet that engages with the dot printing element is bent and formed. A dot matrix printer characterized in that each engagement position is arranged to be dispersed in the main axis direction of the printer.