JP2530855Y2 - Ribbon mask - Google Patents

Description

Detailed description of the invention [Overview] Regarding a ribbon mask that covers an unnecessary portion of an ink ribbon in a shuttle printer to prevent paper contamination, a perforated line of a continuous form and a hole in the ribbon mask conveyed by a line feed or the like. The shuttle with multiple print heads is reciprocated within a predetermined printing range, and the ink ribbon is hit with the dot pins of the print head, with the aim of stabilizing the transfer by preventing it from being caught by the unit. In a shuttle printer that prints on a continuous form on a platen, a ribbon mask interposed between the continuous form and the ink ribbon, each group of minimum units of dot pins, an oblique side with respect to the traveling direction of the continuous form or A diagonal curve is arranged on both sides, holes having a shape not having a straight line perpendicular to the direction are drilled, holes having the same shape are arranged between the holes, and holes adjacent to the holes and holes. Small edge Arrange the shape and arrangement so that they are not parallel at intervals, and fix to the shuttle.

[Industrial applications]

The present invention relates to a ribbon mask for covering unnecessary portions of an ink ribbon in a shuttle printer to prevent paper contamination.

As an ink printer capable of high-speed printing, a shuttle printer of a type that performs printing by reciprocating a dot pin is used.

These printers are required to stably transfer printing paper in addition to printing quality and printing speed.

[Conventional technology]

The shuttle printer to which the ribbon mask of the present invention is applied has a paper feed unit 4 as shown in the completed perspective view of FIG.
And a print unit 7 and an ink ribbon supply mechanism 8.

As shown in the exploded perspective view of FIG.
It comprises a rotatable platen roller 1 and a tractor 3 for transporting the continuous form 2 upward.

The printing unit 7 has a mounting frame 10 on which a plurality of printing heads 6 are mounted as shown in the drawing, mounted on a shuttle 5 that reciprocates within a predetermined range in the left-right direction.

The ink ribbon feeding mechanism 8 feeds an ink ribbon from a not-shown ink ribbon cassette to the front surface of the printing unit 7.

As shown in the front perspective view of FIG.
A total of 24 dot pins 9 are provided, each of which is a set of eight, and a total of 24 dot pins 9 are provided, and the positions of the dot pins 9 are arranged so as to have a step in the left and right direction. In), 24 dots can be printed by printing while reciprocating within the range of 12 dot pins.

The shuttle 5 is reciprocated by a linear motor (not shown).

In addition, a ribbon mask 11 is provided on the front surface of the print head 6 through a gap for inserting the ink ribbon in order to prevent unnecessary portions of the ink ribbon from sliding on and contaminating the paper. Are mounted as shown in the front view of FIG.

The ribbon mask 11 has a shape as shown in the perspective view of FIG. 7A, and has a thickness of 0.05 to 0.1 mm which does not hinder the printing operation by the dot pins 9 and has a rigidity, for example, a stainless steel plate. In addition, as shown in FIGS. 1 and 2B, a plurality of oblong holes 12 are formed obliquely with four dot pins 9 as a minimum unit group.

The printing is performed by rotating the tractor 3 of the paper feeding unit 4 so that the continuous form 2 starts a new line, the ink ribbon feeding mechanism 8 feeds the ink ribbon in a predetermined direction, and the print head 6 is reciprocated within a predetermined printing range. Do it.

[Problems to be solved by the invention]

As described above, a ribbon mask for preventing paper contamination is interposed between the ink ribbon and the paper, and has a structure in which the ribbon mask reciprocates with the print head.

It is desirable that the ribbon mask covers the ink ribbon surface as much as possible except for the portion of the dot pin. However, if the ink ribbon surface is covered too much, the frictional resistance with the paper increases, which causes a paper transfer failure.

For this reason, the size of the hole is determined to be the optimum size for practical use by experiments or other means.

The type of paper is mainly a continuous form, and as shown in the partial view of FIG. 8 (a), a sewing machine for breaking at a predetermined pitch in the direction perpendicular to the transport direction and on both sides thereof in the transport direction. It has eyes 13a and 13b, and paper staples 14 on both sides in the case of copy paper.

For this reason, the perforations 13a and 13b and the paper stapler 14 protrude from the paper surface, and in some cases, a part of the perforation breaks as shown in FIG.

Then, during the reciprocating movement of the ribbon mask at the time of the high-speed shuttle, there is a problem that the protruding portion fits into the hole and hooks the hole, thereby causing a poor transfer of the continuous form and deformation or breakage of the ribbon mask.

In order to prevent the inserted raised portion from being hooked,
As shown in FIG. 2B, the oblong holes 12 are arranged obliquely and the bulge is released at the inclined portions, but the inclination angle cannot be sufficiently obtained, and the arcs at both ends may be hooked. There is not enough effect.

In order to reduce frictional resistance, the elliptical hole has a relatively large area, and an elongated portion is formed between adjacent elliptical holes, and this portion is formed by a protruding portion which is extremely weakly fitted. There is a problem that it is deformed and severely cut.

An object of the present invention is to prevent a perforation of a continuous form to be transferred by a line feed or the like from being caught by a hole of a ribbon mask and to stabilize the transfer.

[Means for solving the problem]

As shown in the enlarged view of the main part of FIG. 1 (a), the object is to arrange oblique sides or oblique curves on both sides with respect to the traveling direction of the continuous form 2 for each minimum unit group of dot pins 9. Holes 16a, 16b having no straight line perpendicular to the direction are drilled, holes 18 of the same shape are arranged between the holes 16a, 16b, and adjacent to the holes 16a, 16b and the holes 18. This is achieved by a ribbon mask 15 which is shaped and arranged such that the edges of the holes are not parallel at small intervals and which is fixed to the shuttle 5.

[Action]

That is, the shuttle 5 reciprocates only in the left and right directions while operating the dot pins 9 of the print head 6, and performs line printing on the continuous form 2, and the continuous form 2 is line-transported in a direction orthogonal thereto. Therefore, the perforations 13a and 13b of the continuous form 2 and the raised portions of the paper stapler 14 are formed by the holes 16a and 16b of the ribbon mask 15.
Or, when appearing in the hole 18 and proceeding, the hole 16a, 16b or the hole 18 does not meet with the raised portion in a parallel line, but encounters in a dotted shape with an oblique side or an oblique curve, and is sneaked in order with less resistance, There is no catch.

In addition, there is no elongated portion having low strength between adjacent hole edges, and a ribbon mask having sufficient strength against the resistance of the raised portion is obtained, and no damage occurs.

〔Example〕

 1 and 2 show an embodiment of the present invention.

 The same parts are denoted by the same reference numerals throughout the drawings.

As shown in FIG. 1 (a) and a front view of the ribbon mask of FIG. 1 (b), the ribbon mask 15 of the present invention has a plate material of the same external dimensions and the same material as the prior art. The two adjacent dot pins 9 are set as a minimum unit group, and an oblique side or an oblique curve is arranged on both sides with respect to the traveling direction (the direction of arrow C) of the continuous form 2, and there is no straight line orthogonal to the direction A hole 16 is formed, and a hole 18 of the same shape is further provided between the holes 16, and a shape such that adjacent holes of the hole 16 and the hole 18 are not parallel at small intervals. And the arrangement.

That is, the hole portion 16 is divided into two upper and lower stages like 16a and 16b in order to make two adjacent dot pins 9 into a minimum unit group.

The upper hole 16a is different from a fan shape opened at an apex arrow α of approximately 90 °, and the lower hole 16b is different from a square shape having an apex arrow α of approximately 90 °.

The hole 18 has a circular shape, and the same hole shape may be used as long as the adjacent hole edge conditions are satisfied. Here, the lower hole 16b is larger than the upper hole,
8 is also provided to increase the opening area, reduce the contact area of the continuous form 2, and reduce the frictional resistance. However, if the holes are too large, the masking action of the ink ribbon is reduced. Therefore, it is preferable to select the size and the number of holes to the extent that the ink is not contaminated.

Further, the corners may be appropriately rounded (for example, 0.2 to 0.8 mm).

By forming the hole 16 in such a shape, the print head 6 can be formed.
During the high-speed reciprocating movement of the ribbon mask 15 accompanying the shuttle operation, the raised portions such as perforations, paper staples, or rolled-up portions of the continuous form 2 that have been fitted into the holes 16 are formed in both holes of the holes 16a and 16b. They meet like dots due to the inclined portions 17a, 17b of the edges or the circular edge of the hole 18, are sneaked in order with low resistance, and do not catch.

For this reason, the transfer of the continuous form 2 is stabilized, and occurrence of a jam is prevented.

Further, as shown in the figure, there is no elongated portion between the adjacent holes, so that the strength is increased as compared with the conventional oval hole, and there is no fear of deformation or breakage due to the raised portion.

In order to reduce the frictional resistance with the continuous form 2, the hole 16
Although one hole 18 is provided at a substantially central portion between them, this is an example, and the number, shape, and size thereof are not limited to this.

[Effect of the invention]

The use of the shuttle printer of the present invention provided with the ribbon mask having the hole as described above has a great economic and industrial effect, such as stabilizing the transfer of continuous forms.

[Brief description of the drawings]

1 (a) is an enlarged view of a main part of the ribbon mask of the present invention, FIG. 1 (b) is a front view of the ribbon mask of the present invention, and FIG. 2 is a perspective view of a completed shuttle printer to which the present invention is applied. FIG. 3, FIG. 3 is an exploded perspective view of FIG. 2, FIG. 4 is a front perspective view of the print head, and FIG. 5 is a front view showing a state in which a ribbon mask is attached to the front of the print head attached to the attachment frame. 6 (a) is a perspective view of the conventional ribbon mask viewed from the back, FIG. 6 (b) is a partially enlarged view showing the holes of the conventional ribbon mask, and FIG. 7 (a) is a continuous form. FIG. 7 (b) is a partial view showing a state where the continuous form is turned. In the figure, 1 is a platen roller, 2 is a continuous form, 3 is a tractor, 4
Is a paper feed unit, 5 is a shuttle, 6 is a print head, 7 is a print unit, 8 is an ink ribbon feeding mechanism, 9 is a dot pin, 10 is a mounting frame, 11 and 15 are ribbon masks, 12 is an oval hole, and 13a. , 13b are perforations, 13c is turned up, 14 is a paper stapler, 16, 16a and 16b are holes, 17a and 17b are inclined portions, and 18 is a hole.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-148686 (JP, A) JP-A-60-162059 (JP, U) JP-A-54-166916 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A shuttle (5) equipped with a plurality of print heads (6) is reciprocated within a predetermined print range, and a dot pin (9) of the print head (6) strikes an ink ribbon to form a platen. In a shuttle printer for printing on the continuous form (2), a ribbon mask (15) interposed between the continuous form (2) and the ink ribbon, wherein a minimum of the dot pin (9) is provided. For each group of units, the oblique side or the oblique curve is arranged on both sides with respect to the traveling direction of the continuous form (2), and the hole (16) having no straight line perpendicular to the direction is provided.
a, 16b), a hole (18) having the same shape is provided between the holes (16a, 16b), and the holes (16a, 16b) and the holes (18) are formed.
The ribbon mask characterized in that the adjacent holes are arranged in such a shape that they are not parallel at small intervals, and are fixed to the shuttle (5).