JPH0712023Y2 - Ribbon guide structure of printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ribbon guide structure of an ink ribbon of a printer for printing forms.

[Conventional technology]

The conventional ribbon guide structure has a serial head type (the required number of head wires are arranged at right angles to the print head sweep direction) and a shuttle head type (head wires are parallel to the print head sweep direction). In either case, the ink ribbon has a structure in which it contacts the head wire surface and prints on the platen surface via printing paper, and the ink ribbon is the ink fixed to the print head as shown in FIG. It was attached and set so that it could be wound around a ribbon wire (ink ribbon mask). By such a method, it was possible to prevent the printing paper from being caught by the leading edge of the printing paper being caught by the ribbon when the paper is inserted.

[Problems to be solved by the invention]

However, in the conventional structure, in order to mount the ink ribbon, it is necessary to hold the ribbon spool containing the ink ribbon by hand and wind it around the ink ribbon wire. In the case of the state, it is necessary to hold and fix the ink ribbon with bare hands (gloves are not generally used at the end of use), and there was a problem that the hands became dirty. There is also a ribbon cassette type from the market demand for a one-touch ribbon set, but this type of type has a mounting difficulty more than the spool type.

In view of the above, the present invention provides a ribbon guide structure which eliminates such problems of the related art, allows an ink ribbon to be easily attached with a simple structure, and prevents printing defects due to the ribbon hooking at the tip of the printing paper when inserting the paper. It is a thing.

[Means for solving problems]

In order to solve the above problems, the present invention provides a ribbon guide on the print paper insertion side with respect to the print head, and the shape of the position in contact with the ink ribbon is inclined so as to move away from the print platen in the print paper insertion direction. A part is formed, and a protrusion is formed on the print platen side on the extension of the part.

[Action]

With the above-mentioned configuration, when the printing paper is inserted, the tip of the printing paper is pushed down by the protrusion of the ribbon guide, and the paper insertion side end of the ink ribbon is in contact with the inclined part of the ribbon guide. There are no hooks on the ribbon, and there are no printing defects due to ribbon misalignment. Further, since the ribbon guide has a simple shape configuration having an inclined portion and a protruding portion, when setting the ink ribbon, it is not necessary to wind it around a ribbon wire or the like as in the conventional case, and the link ribbon can be easily set.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the ribbon guide structure as a whole.

FIG. 2 is a vertical sectional view of the ribbon guide, showing a state in which printing paper is set and the paper is being fed.

FIG. 3 is a vertical cross-sectional view of the ribbon guide showing a state in which printing paper is set.

The print head 1 is a general one that is guided by a guide shaft 4 and is swept in the directions of arrow A and arrow B to perform printing by an energization control means from the outside.

The paper feeding roller 5 holds the printing paper 6 between the paper pressing roller 10 and the paper pressing roller 10, and rotates the paper 6 in the direction of arrow C in the direction of arrow C by an external rotating means to feed the paper in the direction of arrow D. Further, it is possible to rotate in the opposite direction in consideration of the paper take-out property. The frame 2 supports the guide shaft 4, the paper feed roller 5, the ribbon guide 3 and the like.

The ribbon guide 3 is arranged on the paper insertion side with respect to the print head 1. When the printing paper 1 is set, the paper feed roller 5, the ribbon guide 3, and the print head 1 are passed through the front end of the printing paper 1 in this order and set at a predetermined position. The head wire portion 1a is built in the print head 1 and prints on the print paper 1 via the ink ribbon 8 between the print wire 1 and the print platen 9.

When the printing paper 1 is set, the paper pressing roller 10 is opened as shown in FIG. 3 to facilitate the insertion of the printing paper, and at the time of paper feeding, the printing paper 1 is nipped to enable the paper feeding as shown in FIG. The structure is such that it is opened again when 1 is taken out.

The ink ribbon 8 is accommodated in the ribbon cassette 7, a part of which is located on the lower surface of the print head 1 and includes the head wire portion 1a, which is in contact with the ribbon guide 3 and is moved in the direction of arrow E by another driving means. . The ribbon guide 3 is provided with an inclined portion 3a so as to move away from the printing platen in the printing paper insertion direction.
, And the y dimension (0.5m
m to about 1 mm) and a protrusion 3b protruding toward the printing platen. Further, the positional relationship of the tip of the inclined portion 3a is a simple structure which is arranged so as to have a step of x dimension (about 1 to 2 mm) from the lower surface of the print head 1 as shown in FIG. The paper guides 11 are guides for the print paper 6 and are arranged at appropriate positions above and below the print platen 9 and at the rear of the print head 1 at appropriate vertical intervals.

Next, the operation of the embodiment will be described.

When setting the ink ribbon, even in the ribbon spool type and the ribbon cassette type, since the paper pressing roller 10 is in the open state, it is set on the lower surface of the print head 1 without passing through the ribbon guide 3 from the paper insertion side and winding the ribbon wire or the like. be able to.

When the printing paper 1 is set, it passes through the paper pressing roller 10 which is in the open state as in the case of setting the ribbon, and abuts on the protrusion 3a of the ribbon guide 3. Ribbon guide 3
Has a step of x dimension from the print head 1, so that the end 8a of the ink ribbon 8 on the paper insertion side is slightly bent by the winding force in the direction of arrow E and comes into contact with the inclined portion 3a of the ribbon guide 3. Further, since a part of the ink ribbon 8 also extends over the lower part of the head wire 1a, it is naturally possible to print on the printing paper 1 via the ink ribbon.

FIG. 4 shows another embodiment in which the inclined portion 3a and the protruding portion 3b of the ribbon guide 3 of the above embodiment are integrally formed on the lower surface of the print head 1.

In this case as well, the same operation as the above-mentioned embodiment is obtained.

[Effect of device]

As described above, according to the present invention, the ribbon guide is arranged on the paper insertion side with respect to the print head 1, and the shape of the portion in contact with the ink ribbon is inclined in the direction in which the print paper is inserted and away from the print platen. It has a portion 3a, and further has a protrusion 3b projecting to the printing platen side on its extension. Since the end portion of the ink ribbon on the paper insertion side is also bent and contacts the inclined portion of the ribbon guide 3, the printing paper Even when the front end of the printing paper is curled at the time of insertion, the front end of the printing paper 1 is pushed down against the protrusion 3b and is in contact with the inclined portion 3a. Nor. Therefore, there is no printing failure due to ribbon misalignment. Further, since the ribbon guide 3 has a simple shape, it is not necessary to wind it around a ribbon wire or the like when setting the ink ribbon, and the link ribbon can be easily attached.

Further, as another effect, since the protrusion 3b of the ribbon guide 3 is in contact with the printing paper 1, there is an effect that the printing sound is suppressed against the noise caused by the vibration of the printing paper during printing. With respect to the effects of the other embodiments, the same effect can be obtained because the shape of the ribbon guide is the same.

[Brief description of drawings]

FIG. 1 is a perspective view showing the ribbon guide structure as a whole. FIG. 2 is a longitudinal sectional view of the ribbon guide showing a state in which printing paper is set and the paper is being fed. FIG. 3 is a vertical sectional view showing a state in which a print sheet is set, and FIG. 4 is a view showing an example in which a ribbon guide and a print head are integrated in another embodiment. FIG. 5 is a perspective view of a conventional example. 1 …… Print head 2 …… Frame 3 …… Ribbon guide 4 …… Guide shaft 6 …… Printing paper 8 …… Ink ribbon 9 …… Platen 10 …… Paper pressing roller

Claims (1)

[Scope of utility model registration request] 1. A print head which reciprocates in a direction substantially perpendicular to the conveying direction of the printing paper and which has a plurality of printing means in the digit direction, and ink which holds the ink which is in contact with the printing head and is transferred to the printing paper. A ribbon, a platen that faces the print head and receives the impact of the print head via the print paper and the ink ribbon, and a paper feeding unit that conveys the print paper to the position of the print head, The ribbon guide is disposed on the insertion side of the printing paper with respect to the printing head, and has a ribbon guide having a width substantially equal to that of the printing head or a width within a moving range of the printing head. The inclined portion provided so that the gap between the platen and the platen becomes wider toward the direction, and the gap between the print head and the platen located on the extension of the inclined portion on the platen side. Ribbon guide structure of the printer, characterized by having a narrow projections than.