JP2572020Y2 - Paper guide device - Google Patents

Description

The present invention relates to a paper guide device used in a serial printer.

2. Prior Art First, FIGS. 4 and 5 show a conventional example. Reference numeral 1 denotes a platen. A carrier 2 reciprocally driven along the platen 1 has a dot printer head 3 as a print head and a ribbon cassette 4 mounted thereon. Further, both sides of the ribbon guide 5 are fixed to the carrier 2. An opening 6 facing the dot printer head 3 is formed in the center of the ribbon guide 5. Furthermore, ribbon guide 5
On both sides of the opening 6 on the surface of the platen 1 side, a mask plate 16 having a printing hole 7 at the center portion facing the tip of the dot printer head 3 is fixed by a double-sided adhesive tape 9.

As shown in FIG. 5, the upper edge of the ribbon guide 5 gradually inclines toward the platen 1 as it goes upward so as to guide the ink ribbon 4a of the ribbon cassette 4 to the tip of the dot printer head 3. A guide surface 11 is formed, and a recess 12 is formed in the center of the surface of the guide surface 11 on the platen 1 side. At the upper edge of the central portion of the mask plate 16, there is formed an inclined surface 13 which is located in the concave portion 12 and gradually inclines toward the platen 1 as it goes upward. The distance between the platen 1 and the mask plate 16 is set to 0.14 to 0.19 mm.

In such a configuration, the paper 15 wound around the platen 1 and the ink ribbon 4a are shielded by the mask plate 16, thereby preventing ink from adhering to unnecessary portions of the paper 15. When the dot printer head 3 is driven,
The needle projects into the print hole 7 and collides with the paper 15 on the platen 1 via the ink ribbon 4a, whereby printing is performed.

When the paper 15 is set on the platen 1, the carrier 2 is positioned at the end of the platen 1, and the carrier 2 is moved for printing. At this time, the paper 15 may be caught on the mask plate 16. When the side edges of the plurality of sheets 15 are overlapped and one side is hardened with glue, the sheet 15 may be torn because the sheet 15 receives a large resistance from the mask plate 16. Further, when the paper 15 is fed by the platen 1, the leading edge of the paper 15 may be caught on the edge of the printing hole 7 of the mask plate 16. The perforated paper 15 and the like having perforations are also likely to be torn because the perforations are caught by the opening edges of the printing holes 7. Also,
There is also a possibility that the leading edge of the paper 15 is hooked on the upper edge of the concave portion 12.

Means for Solving the Problems A carrier holding a print head and reciprocally driven along a platen, a plate-shaped ribbon guide held at a front portion of the carrier and having an opening facing the print head, A mask plate formed of elastic metal flakes and having a printing hole facing the tip of the print head and fixed to both sides of the opening on the platen-side surface of the ribbon guide; and A step formed on both sides and gradually inclined toward the platen side toward the printing hole, and bending the upper end side of the ribbon guide and the upper end side of the mask plate in a direction along the circumference of the platen. And a plurality of ribs formed on the inclined surface and protruding toward the platen.

Function The mask plate is fixed to the ribbon guide on both sides, but has steps on both sides, so that the mask plate interferes with the paper between the steps without affecting the fixed part with the ribbon guide. The sheet can be elastically deformed and retracted from the sheet, thereby avoiding a state in which the sheet is caught on the mask plate.In addition, when the sheet is inserted, the sheet is caught in the concave portion and the sheet is conveyed. There is no obstacle.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof is omitted. Ribbon guide 5
A mask plate 8 formed of a metal flake having elasticity is fixed to a surface on the platen 1 side by a double-sided adhesive tape 9. A printing hole 7 and an inclined surface 13 located at the upper edge are formed at the center of the mask plate 8, and a step portion 10 which is gradually inclined toward the platen 1 toward the center printing hole 7 is formed on both sides. Is formed. Further, a plurality of ribs 14 projecting toward the platen 1 so as to straddle the boundary between the upper edge of the mask plate 8 and the upper edge of the concave portion 12 in the upper part of the surface of the ribbon guide 5 on the platen 1 side. Are formed. The protruding height of these ribs 14 is the highest at the center, and gradually lowers upward or downward.

In such a configuration, the mask plate 8 is fixed to the ribbon guide 5 on both sides, but has the step portions 10 on both sides, so that the mask plate 8 is fixed to the ribbon guide 5 (the portion fixed by the double-sided adhesive tape 9). 2), the mask plate 8 can be elastically deformed by the interference with the sheet 15 between the step portions 10 and retracted from the sheet 15. Thus, it is possible to avoid a state in which the paper 15 is caught on the edge of the printing hole 7 of the mask plate 8. In addition, since the step portion 10 has a shape that is gradually inclined toward the platen 1 as both sides are directed toward the center, when the carrier 2 is moved after the paper 15 is set on the platen 1, the stepped portion 10 is in contact with the mask plate 8. Resistance to the paper 15 at the time of interference with the paper 15 can be reduced. Further, the upper edge of the paper 15 that has passed through the printing hole 7 when the paper 15 is fed can be guided by the ribs 14, whereby the upper edge of the paper 15 is hooked on the upper edge of the concave portion 12 of the ribbon guide 5. The situation can also be avoided.

Effect of the Invention As described above, the present invention provides a carrier that holds a print head and reciprocates along a platen, and a plate-shaped carrier that is held at the front of the carrier and has an opening facing the print head. A ribbon guide, a mask plate formed of elastic metal flakes and having a printing hole facing the tip of the print head and fixed to both sides of the opening on the platen-side surface of the ribbon guide; Step portions formed on both sides of the mask plate and gradually inclined toward the platen side toward the printing holes,
An inclined surface formed by bending the upper end side of the ribbon guide and the upper end side of the mask plate in a direction along the circumference of the platen, and a plurality of ribs formed on the inclined surface and projecting toward the platen. The mask plate is fixed to the ribbon guide on both sides, but has a step on both sides, so that the mask plate can be moved between the steps without affecting the fixing portion with the ribbon guide. The paper can be elastically deformed by interference with the paper and retracted from the paper, thereby avoiding a state where the paper is caught on the mask plate, thereby preventing the paper from being damaged, In addition, there is an effect that the sheet is not caught in the concave portion when the sheet is inserted and does not hinder the sheet conveyance.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention.
1 is a plan view showing only the ribbon guide and the mask plate in cross section, FIG. 2 is a side view showing only the ribbon guide and the mask plate in cross section, and FIG. 3 is a central portion of the ribbon guide and the mask plate. FIGS. 4 and 5 show a conventional example, and FIG.
The figure is a plan view showing only the ribbon guide and the mask plate in cross section, and FIG. 5 is a side view showing only the ribbon guide and the mask plate in cross section. DESCRIPTION OF SYMBOLS 1 ... Platen, 2 ... Carrier, 3 ... Print head, 5 ... Ribbon guide, 6 ... Opening, 7 ... Printing hole, 8 ... Mask plate, 10 ... Step, 12 ... Depression, 13 ... Inclined surface, 14 ... Rib

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41J 11/62 B41J 13/10 B41J 15/04 B41J 35/04

Claims (1)

(57) [Scope of request for utility model registration] A carrier that holds a print head and is reciprocally driven along a platen; a plate-shaped ribbon guide that is held at a front portion of the carrier and has an opening facing the print head; A mask plate formed of a metal flake having a printing hole facing the tip of the print head and fixed to both sides of the opening on the platen-side surface of the ribbon guide; and a mask plate on both sides of the mask plate. A stepped portion formed and gradually inclined toward the platen side toward the printing hole, and formed by bending an upper end side of the ribbon guide and an upper end side of the mask plate in a direction along a circumference of the platen. And a plurality of ribs formed on the inclined surface and protruding toward the platen.