JPS5837650Y2 - dot printer print head - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a print head for a dot printer.

An object of the present invention is to provide a dot printer with a simple mechanism that reliably guides an ink ribbon and recording paper through a very narrow gap between the tip of a print head and a platen.

Conventional dot printers print predetermined characters, symbols, etc. in the form of dots by pressing a recording paper against a platen via an ink ribbon using several thin wires flying from a print head as a pressure means.

In this case, the flight distance of the wire is restricted due to the relationship between the size of the print head, the size of the printer) and printing energy, and therefore the gap between the tip of the print head and the platen via the ink ribbon and recording paper is Q. Good printing quality cannot be obtained unless the width is very narrow, about 5 mm.

Therefore, it is extremely difficult to smoothly pass ink ribbons and recording paper through narrow gaps and position them.
The solution to this problem was to attach parts with complicated shapes to the tip of the print head.

The present invention eliminates such drawbacks, and will be explained below using FIGS. 1, 2, 3, and 4.

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a view of the tip of the print head shown in FIG. 1 viewed from the direction of arrow A, and FIG. Fig. 4 shows a front view of Fig. 3.

1 and 2, a groove 1a for guiding the ink ribbon 2 is provided at the tip of the print head 1, and this groove 1a
This positions the ink ribbon 2 and prevents the roll paper 3 or card paper 4 placed in the narrow gap between the platen 5 and the ink ribbon 2 from coming into contact with the ink ribbon 2 and getting dirty.

In addition, the inclined surfaces 1b, 1C, ld at the tip of the print head 1,
The function of le has the effect of smoothly passing the roll paper 3 and card paper 4 through the tip of the print head 1 from the front, back, left and right directions.

Further, due to the effect of the slope portion 1b, the ink ribbon 2 can be easily inserted from the direction of arrow B.

By making the tip of the print head 1 integral and in a special shape as described above, it is possible to create an inexpensive and simple print head, and recording paper and ink ribbons do not get caught in the print head. Can be operated smoothly.

Figures 3 and 4 show the print head 1 shown in Figures 1 and 2.
The tip of the guide is kept in a simple shape, and an integrally molded head cap 6 is attached to provide a similar effect as a guide.

The head cap 6 is provided with a groove 6a for the ink ribbon 2, and this groove 6a positions the ink ribbon 2 and prevents roll paper or card paper inserted into the narrow gap between the platen and the ink ribbon from coming into contact with the ink ribbon and getting dirty. To prevent.

In addition, the slope portions 6b, 6C, 6d, and 6e of the head cap 6
This function has the effect of smoothly passing roll paper and card paper through the tip of the print head 1 from the front, back, left and right.

Furthermore, the effect of the sloped portion 6b facilitates insertion of the ink ribbon 2 from the direction of arrow B.

FIG. 5 is a perspective view of an embodiment in which the shape of the square hole through which the printing wire passes through the head cap of the embodiment shown in FIGS. 3 and 4 is changed so that it also serves as a wire guide.

As in the previous embodiment, the head cap 7 has sloped portions on each of its four sides, and grooves are formed by convex portions 7 a and 7 b for guiding the ink ribbon 2 in the vertical and width directions.

In addition, there are multiple holes 7C on the front to guide the wire, and by preparing multiple head caps with different pitches P of the holes 7C, you can leave the main body of the print head as it is and just replace the head cap. Print heads with different character heights can be used.

As described above, the present invention has a removable head cap at the tip of the print head, and the head cap has a plurality of holes for guiding the wire, a groove for guiding the ink ribbon, and slopes on four sides. Since this is a print head for a dot printer, the ink ribbon is positioned in the groove, and the roll paper or card paper inserted into the narrow gap between the platen and the ribbon is prevented from coming into contact with the ribbon and getting dirty. .

Moreover, the sloped portions on the four sides of the head cap allow the tip of the print head to pass through smoothly even when inserting from the direction of roll paper, card paper, etc., and the insertion of the ink ribbon is also good.

Furthermore, by preparing multiple head caps with different pitches of wire-guiding holes, it is possible to create print heads with different character heights by simply replacing the head caps while leaving the print head itself unchanged. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a view of the tip of the print head shown in FIG. 1 viewed from the direction of arrow A, and FIG. FIG. 4 shows a front view of the head cap shown in FIG. 3. FIG. 5 is a perspective view showing another embodiment of the present invention. 1... Print head, 2... Ink ribbon, 3... Roll paper, 4... Card paper, 5... Platen, 6 ...Head cap.

Claims (1)

[Scope of utility model registration request] In the print head of a dot printer that prints arbitrary characters or symbols on recording paper using an ink ribbon as a coloring medium, the print head has a removable head cap at its tip, and the head cap includes a plurality of wire guides. A print head for a dot printer, characterized by having a hole, a groove for guiding an ink ribbon, and sloped portions on four sides.