JPS5852929Y2 - Print cradle for dot printer - Google Patents

Description

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

An object of the present invention is to provide a printing holder of a dot printer that is extremely inexpensive and simple by using a commercially available or molded polygonal material.

Another object of the present invention is to take advantage of the polygonal shape of the print holder to improve the ease of inserting recording paper, forms, ink ribbons, etc.

Another object of the present invention is to enable easy positioning of the print cradle when fixing it to the frame, thereby improving assembly efficiency.

The print holder of a conventional dot printer is generally called a platen and has a cylindrical shape, as shown in FIGS. 1 and 2.

The platen 1 is made from hard rubber made by molding, so the parts cost is very high, and as shown in Fig. 2,
Since the platen 1 is circular, when printing, out of the seven print head wires 2A to 2G, 2A,
There is a considerable stroke difference A between 2G and 2D, which has the disadvantage that when printed, a difference in shading appears in the characters.

In addition, in order to eliminate the difference in shading, it is necessary to increase the outer diameter of the platen 1 and reduce the stroke difference A, which results in a large platen that makes it difficult to integrate into a compact printing mechanism. There are drawbacks.

There are also examples of using a flat platen, but recording paper,
This had the disadvantage that it was difficult to insert ink ribbons, etc.

The present invention eliminates such drawbacks, and one embodiment thereof will be described below with reference to FIGS. 3, 4, and 5.

By using a commercially available regular hexagonal square material for the print holder 5, the recording paper 8 fed through the paper guide (inner) 6 and the paper guide (outer) 7 is placed in the print holder 5. It is guided by the slope part 5a and passes smoothly through the printing part.

Further, when inserting the card 9 from above for authentication printing, etc., the card 9 can be set in a predetermined position by being guided by the slope portion 5b of the print holder 5.

Furthermore, since the print receiving surface 5C of the print holder 5 facing the print head 10 has a planar shape, it is similar to that shown in FIG. 1 as seen in the conventional apparatus.

All the drawbacks of the cylindrical platen 1 shown in FIG. 2 can be solved.

First, when the platen diameter is small, the difference in the flight distance of the head wire, which causes printing shading, is resolved by the printing receiving surface 5C having a flat shape, and the length of the flat part can be equal to the character height. Since this is sufficient, the printing holder can be made compact, and the entire device can therefore be made compact.

Furthermore, by using a commercially available standard product as the printing cradle, it is possible to significantly reduce costs.

Furthermore, as shown in FIGS. 4 and 5, the frame 11.12 that supports the print pedestal 5 is also formed with a recess 11a shaped to match the cross-sectional shape of the print pedestal 5 by pressing or milling.
12a and by engaging the print holder 5 with the recesses 11a and 12a, the print holder 5 can be easily positioned when fixed to the frame 11.12, and the ease of assembly can be improved.

Furthermore, by machining the printing pedestal 5, a shaft portion 5d can be formed, which can be used as the fulcrum shaft of the rotating lever 13. By using a single polygonal block for multiple purposes, it can be made small. A low-cost printing mechanism that uses space effectively can be achieved.

As detailed above, the present invention solves the problem of print shading difference, which is a disadvantage of the circular print holder of conventional dot printers, by using a print holder (platen) with a large outer diameter. The problem of the entire device becoming bulky due to the need for a platen, and the problem of increased cost due to the use of special hard rubber for the platen, etc., can all be solved by using commercially available polygonal square pieces.

Furthermore, when the surface of the print holder becomes worn out, it is only necessary to change the surface of the print holder without replacing the print holder.

Furthermore, recently there has been a demand for hand-held dot printers, and the present invention perfectly meets the demands of the times, and can be made into a very inexpensive and compact dot printer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the printing section of a conventional device, FIG. 2 is a side view, and FIG. 3 is a sectional view of the main body showing an embodiment of the present invention.
FIG. 4 is a sectional view of the print holder, and FIG. 5 is a side view of the print holder. 1.5...print cradle, 2,10...indicates print head, 3...ink ribbon, 4...
····Recording paper.

Claims (1)

[Scope of utility model registration request] In a dot printer that prints predetermined characters, patterns, etc. using a print head, the print pedestal facing the print head is made of a polygonal block, and the print pedestal is attached to a frame that supports the print pedestal. A printing holder for a dot printer, characterized in that a recessed portion having a shape matching the cross-sectional shape is provided, and the printing holder is engaged with the recessed portion.