JPH06135106A - Ink ribbon cassette for printer - Google Patents

Abstract

PURPOSE:To prevent an occurrence of paper jamming and a damage of a ribbon masking plate by a method wherein the ribbon masking plate is so curved that the center part of a printing slot thereof in the width direction of the ribbon masking plate is projected toward a platen higher than the both ends thereof in the same direction thereof. CONSTITUTION:When a body case 1 is loaded on a printer, an exposed ink ribbon 9a between arm-form ribbon guide parts 2L, 2R is shielded from a platen 22 by a curved ribbon masking plate 11. When paper P is fed into between the platen 22 and the ribbon masking plate 11, the paper P is so set as to come into slide contact with a part of the ribbon masking plate 11 or the like. At this time, both end parts 12b, 12c of a printing slot 12 of the ribbon masking plate 11 in the width direction thereof are spaced from the platen 22 by a larger distance than a center part 12a in the same direction, thus being retracted from the feed direction of the paper P out of contact with the ends of the paper P. Therefore, there is no possibility that the ends of the paper P are caught by the end parts 12b, 12c of the printing slot 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon cassette for a printer.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of an ink ribbon cassette mounted on a predetermined portion of a printer and used for printing. In the figure, 1 is a main body case. The main body case 1 has a pair of arm-shaped ribbon guide portions 2L and 2R, and is configured to accommodate an endless ink ribbon 9 through both guide portions 2L and 2R in a circulating manner. The ink ribbon 9 is circulated and run in the direction of the arrow in the figure by a ribbon feed rotating body (ribbon drive gear 5a, ribbon pinch gear 5b).

Further, in FIG. 3, reference numeral 18 denotes a ribbon mask plate, which is an exposed portion 9a of the ink ribbon 9 located between both arm-shaped ribbon guide portions 2L and 2R when the main body case 1 is mounted on a predetermined portion of the printer. It is shielded from the print stand 22 of the printer. This ribbon mask plate 1
In FIG. 8, printing is performed on the paper P sent between the stamp base 22 and the ribbon mask plate 18 by cooperation of each wire (not shown) of the print head 21 of the printer and the exposed portion 9 a of the ink ribbon 9. In order to allow each wire to pass through, a printing hole 19 is formed so as to pass therethrough. The ribbon plate 18 is generally formed in a flat shape from a thin polyester film having a thickness of about 50 to 100 μm.

In FIG. 3, reference numeral 6 denotes an ink replenishment mechanism, which replenishes the ink impregnated in the ink roller 7 to the ink ribbon 9 via the transfer roller 8 so that the ink ribbon 9 can be used for a long period of time. It is often provided on the body case 1.

[0005]

In the above-described ink ribbon cassette, however, as shown in FIG. 4, the end portion of the paper P sent between the stamp base 22 and the ribbon mask plate 18 for printing or the like is not printed. The plate 18 may be caught in the end portion 19b of the printing hole 19 and may cause a paper jam or damage the plate 18 to make it unusable.

In view of the above circumstances, an object of the present invention is to prevent the occurrence of a paper jam and prevent the ribbon mask plate from being damaged by preventing the paper from being caught in the printing hole of the ribbon mask plate. To provide a set.

[0007]

An ink ribbon cassette for a printer according to the present invention accommodates an endless ink ribbon having a pair of arm-shaped ribbon guide portions so that the ink ribbon can be circulated through both arm-shaped ribbon guide portions. The main body case and a ribbon mask plate that shields the exposed portion of the ink ribbon located between the arm-shaped ribbon guide portions from the print stand of the printer when the main body case is attached to a predetermined portion of the printer are provided. In an ink ribbon cassette for a printer having a printing hole penetrating the mask plate, the ribbon mask plate is projected so that the central portion of the printing mask in the width direction of the ribbon mask plate is closer to the printing plate than both ends in the same direction. It is characterized by being curved like this.

[0008]

According to the present invention having the above-described structure, when the main body case is attached to a predetermined portion of the printer, the exposed portion of the ink ribbon located between the arm-shaped ribbon guide portions is shielded by the curved ribbon mask plate from the stamp of the printer. . In this state, when the paper is fed between the stamp and the ribbon mask plate, the paper is set in a predetermined position by sliding contact with a part of the ribbon mask plate or the like.

At this time, both ends in the width direction of the ribbon mask plate of the printing holes of the ribbon mask plate are farther from the printing plate than the central part in the same direction, and the paper is determined by the positional relationship between the central part and the printing plate. Since it is retracted from the conveyance direction of, it does not contact the edge of the paper. Therefore, the end portion of the paper is not caught on the end portion of the printing hole of the ribbon mask plate, and the paper jam and the damage of the ribbon mask plate are prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The ink ribbon cassette for this printer has a pair of arm-shaped ribbon guide portions 2 as shown in FIGS.
A body case 1 that accommodates an endless ink ribbon 9 having L and 2R so as to be able to circulate through both ribbon guide portions 2L and 2R, and both ribbons when the body case 1 is attached to a predetermined portion of a printer. A ribbon mask plate 11 having a printing hole 12 for shielding the exposed portion 9a of the ink ribbon 9 located between the guide portions 2L and 2R from the printing plate 22 of the printer is provided with the ribbon mask plate 11 and the ribbon of the printing hole 12. The mask plate width direction central portion 12a is configured to be curved so as to project toward the printing plate 22 rather than both end portions 12b and 12c in the same direction.

In the main body case 1 of the ink ribbon cassette, a ribbon feeding rotary member having the same structure as the conventional one [ribbon drive gear (5a), ribbon pinch gear (5b)].
Further, an ink supply mechanism (6) and the like are housed (the ribbon feed rotating body and the like are omitted in FIGS. 1 and 2).

Here, both arm-shaped ribbon guide portions 2L,
Both end portions 3b of the front surface portions 3, 3 facing the 2R stamp base 22,
2c is curved so as to project toward the printing plate 22 in the vertical direction in FIG. 2, and guide grooves 4 and 4 for guiding the ink ribbon 9 are provided at both end portions 3b in the central portion of the front surface portions 3 and 3. , 3c are formed so as to have a slightly larger curvature than the portions 3c. A ribbon mask plate 11 having a rhombus-shaped printing hole 12 is provided between the front face portions 3 and 3 of the ribbon guide portions 2L and 2R along both end portions 3b and 3c of the front face portions 3 and 3, respectively. It is curved and fixed. As a result, the central portion 12a in the mask plate width direction of the printing hole 12 of the mask plate 11 has both end portions 12b and 12c in the same direction.
2 will protrude to the right in FIG.

Next, the operation will be described. Body case 1
Is attached to a predetermined portion of the printer, the exposed portion 9a of the ink ribbon 9 located between the arm-shaped ribbon guide portions 2L and 2R is shielded by the curved ribbon mask plate 11 from the printing plate 22. In that state, when the paper P is fed between the stamp base 22 and the ribbon mask plate 11,
The paper P is set in a predetermined position by slidingly contacting a part of the ribbon mask plate 11 or the like.

At this time, both ends 12b in the width direction of the ribbon mask plate of the printing hole 12 of the ribbon mask plate 11,
12c is further away from the printing plate 22 than the central portion 12a in the same direction, and is retracted from the conveyance direction of the paper P determined by the positional relationship between the central portion 12a and the printing plate 22. Do not touch. Therefore, the end portion of the paper P is the end portion 12b of the printing hole 12 of the ribbon mask plate 11.
It will not get caught in (12c).

According to this embodiment, however, the ribbon mask plate 11 is configured such that the ribbon mask plate 11 widthwise central portion 12a of the printing hole 12 has both end portions 12b, 1 in the same direction.
Since it is curved so as to protrude toward the printing plate 22 rather than 2c, the paper P is prevented from being caught in the printing hole 12 of the ribbon mask plate 11 to prevent occurrence of paper jam and damage to the ribbon mask plate 11. Can be achieved.

In the above embodiment, the printing hole 12 of the ribbon mask plate 11 has a diamond shape, but it may have another shape (for example, an ellipse).

[0017]

According to the present invention, the ribbon mask plate is curved so that the central portion of the printing hole in the width direction of the ribbon mask plate projects toward the printing plate rather than both ends in the same direction. It is possible to prevent the sheet from being caught in the printing hole of the mask plate and prevent the occurrence of a paper jam and the ribbon mask plate from being damaged.

[Brief description of drawings]

FIG. 1 is an exploded perspective view for explaining a main part of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the positional relationship between the ribbon mask plate, the printing plate, and the paper sent between the ribbon mask plate and the printing plate.

FIG. 3 is a diagram for explaining a schematic configuration of a conventional ink ribbon cassette.

FIG. 4 is a diagram for explaining an inconvenience that occurs in a conventional ink ribbon cassette.

[Explanation of symbols]

1 Body Case 2L, 2R Arm-shaped Ribbon Guide Section 9 Ink Ribbon 9a Ink Ribbon Exposed Area 11 Ribbon Mask Plate 12 Printing Hole 12a Ribbon Mask Plate Width Center Section of Printing Hole 12b, 12c Ribbon Mask Plate of Printing Hole Width end

Claims (1)

[Claims] 1. A main body case for accommodating an endless ink ribbon having a pair of arm-shaped ribbon guide portions so as to be able to circulate through both arm-shaped ribbon guide portions, and the main body case is attached to a predetermined portion of a printer. And a ribbon mask plate that shields the exposed portion of the ink ribbon located between both arm-shaped ribbon guide portions from the printing plate of the printer, and a printing hole is formed through the ribbon mask plate. Ink ribbon cassette for printer, characterized in that the ribbon mask plate is curved so that the center portion of the printing hole in the width direction of the ribbon mask plate projects toward the printing plate rather than both ends in the same direction. .