JPH0750212Y2 - Paper guide device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paper guide device used in a printing machine.

Conventional Technology First, a conventional example will be described with reference to FIG. Platen 1
A carrier 4 is slidably fitted to a carrier shaft 2 and a carrier guide shaft 3 which are parallel to each other, and a dot printer head 6 having a needle guide 5 projecting toward the platen 1 is fixed to the carrier 4. Further, pinch rollers 7 and 8 elastically contacting the lower outer periphery of the platen 1, a paper bail roller 9 elastically contacting the upper outer periphery of the platen 1, and a paper pan 10 extending along the lower outer periphery of the platen 1. Is provided. Further, a paper guide 30 having a mask plate 14 that is formed at the tip of the needle guide 5 and that separates the ink ribbon 12 from the paper 13 on the platen 1 is provided, and the paper guide 30 is formed on both lower sides of the paper guide 30. The projected pieces 31 are fixed to both sides of the carrier 4 by screws 32. The paper guide 30 has a narrower interval with respect to the platen 1 from the portion facing the tip of the needle guide 5 to the upper part, and separates from the platen 1 toward the lower part. Reference numeral 15 is a holding plate for holding the floating of the paper 13 from the platen 1.

Problems to be solved by the invention However, if the paper 13 is thick, the paper guide 30
The pressure of 13 elastically warps the platen 1 away from the platen 1. In this case, the paper guide 30 is deformed around the mounting portion 31 for the carrier 4, so that the ink ribbon 12 is pressed against the tip of the needle guide 5 by the mask plate 14. Therefore, the ink ribbon 12 is caught on the tip of the needle of the dot printer head 6, which may damage or make it difficult to run, which may affect the print quality and break the needle.

Further, as described in Japanese Utility Model Laid-Open No. 61-138558, a guide plate for partitioning the ribbon and the paper is provided so as not to be deformed. In this case, however, the guide plate is not provided. Since the ink ribbon is not deformed, it is not deformed by being pressed by the paper, and the above-mentioned problem that the ink ribbon is pressed against the tip of the needle guide and caught on the tip of the needle does not occur.

Means for Solving the Problems A dot printer head having a needle guide protruding toward the platen is provided in a carrier that reciprocates along the platen, and a window facing the tip of the needle guide is formed to form an ink ribbon and the ink ribbon. It has a mask plate that separates it from the paper on the platen, and a paper guide with a small gap with the platen is provided on the paper discharge side, and mounting parts located on both sides of the needle guide on the paper discharge side from the needle guide are provided. A holding portion formed on the paper guide and holding these mounting portions is provided on the carrier, and when a thick sheet is inserted, the upper portion of the paper guide is elastically deformed so as to separate from the platen and the lower portion approaches the platen side. Made possible

When a thick paper is used, the paper guide elastically deforms by pressing the narrow part of the paper discharge side between the platen and the paper guide by the paper, but the deformed state is that the upper part of the paper guide is Since the lower part is separated from the platen and is closer to the platen side, the distance between the tip of the needle guide and the mask plate is not narrowed, thereby preventing the ink ribbon and the needle guide from being caught.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those described in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted (same below). Carrier 4
Posts 16 are erected on both sides of the front part of each of the columns, the upper ends of these posts 16 are located slightly on the paper discharge side (above) from both sides of the needle guide 5, and a holding portion 17 is provided on the upper ends of these posts 16. Has been formed. And a mask plate 14 made of thin steel plate
On both sides of a synthetic resin paper guide 18 having a fitting portion 19 fitted to the lower portion of the column 16 with some clearance, and fixed to a holding portion 17 at the upper end of the column 16 with a screw 20. The mounting portion 21 is formed.

In such a configuration, printing is performed by causing the needle of the dot printer head 6 to project toward the platen 1 and bringing the ink of the ink ribbon 12 into contact with the paper 13 in the process of moving the carrier 4 along the platen 1.
At this time, if the paper 13 is thick, the paper guide 18 made of synthetic resin
Receives the resistance of the paper 13, but the paper guide 18 gradually separates from the platen 1 as it goes to the lower part, so the part receiving the resistance is the upper part. Further, since the fitting portion 19 at the lower portion of the paper guide 18 is fitted to the column 16 with a slight clearance, the paper guide 18
Is elastically warped such that the upper part of the holding part 17 separates from the platen 1 and the lower part approaches the platen 1 side. As a result, the portion of the mask plate 14 facing the needle guide 5 is located below the holding portion 17 and
A little away from the tip of. Therefore, the ink ribbon 12 runs smoothly without being caught on the tip of the needle guide 5, and damage to the ink ribbon 12 and breakage of the needle are prevented. Note that the paper guide 18
When the sheet 13 is deformed by the resistance of the sheet 13, the lower portion slightly approaches the platen 1 side, but the sheet 13 is not pressed to the platen 1 because the distance between the sheet 13 and the platen 1 increases as it goes to the lower portion.

Next, a second embodiment of this invention will be described with reference to FIGS. 3 and 4. In this embodiment, projecting piece-like mounting portions 23 are integrally formed on both sides of a synthetic resin paper guide 22 having a mask plate 14, and a holding portion 24 for holding the mounting portion 23 by a screw 20 is provided at the upper end. The column 25 and the hook 26 that engages with the lower portion of the paper guide 22 are formed integrally with the carrier 4. The mounting portion 23 and the holding portion 24 are located slightly on the paper ejection side from both sides of the needle guide 5,
The engagement portion between the paper guide 22 and the hook 26 is dimensioned so that some play is produced.

Therefore, when the paper 13 is thick, the paper guide 22 warps elastically around the holding portion 24, the upper part slightly separates from the platen 1 and the lower part approaches the platen 1 side as in the above-described embodiment.

As described above, this invention provides a dot printer head having a needle guide protruding toward the platen in a carrier that reciprocates along the platen, and a window facing the tip of the needle guide is formed to form an ink ribbon and the ink ribbon. It has a mask plate that separates it from the paper on the platen, and a paper guide with a small gap with the platen is provided on the paper discharge side, and mounting parts located on both sides of the needle guide on the paper discharge side from the needle guide are provided. A holding portion formed on the paper guide and holding these mounting portions is provided on the carrier, and when a thick sheet is inserted, the upper portion of the paper guide is elastically deformed so as to separate from the platen and the lower portion approaches the platen side. Since it is possible, when using thick paper, use it for the platen and paper guide. The paper guide is elastically deformed by pressing the narrow part on the discharge side by the paper, but the deformed state is that the upper part of the paper guide separates from the platen and the lower part approaches the platen side. The distance between the tip of the needle guide and the mask plate does not become narrow, which prevents the ink ribbon and the needle guide from being caught, and
It is possible to prevent the ink ribbon from getting caught in the needle guide, thus stabilizing the running of the ink ribbon and preventing damage to the ink ribbon to improve print quality.Furthermore, the needle of the dot printer head is broken. It has the effect of being able to prevent

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a side view in which a part of a paper guide is shown in section, and FIG. 2 shows a part of a carrier and a paper guide. An exploded perspective view showing the relationship, FIGS. 3 and 4 show a second embodiment of the present invention, FIG. 3 is a side view, and FIG. 4 shows the relationship between a part of the carrier and the paper guide. FIG. 5 is an exploded perspective view showing a conventional example, and is a side view in which a part of the paper guide is shown in section. 1 ... Platen, 4 ... Carrier, 5 ... Needle guide, 6 ... Dot printer head, 11 ... Window, 12 ... Ink ribbon, 13 ... Paper, 14 ... Mask plate, 17 ...
… Holding part, 18,22 …… Paper guide, 21 …… Mounting part, 2
3 …… Mounting part, 24 …… Holding part

Claims (1)

[Scope of utility model registration request] 1. A dot printer head having a needle guide projecting toward the platen is provided in a carrier that reciprocates along the platen, and a window facing the tip of the needle guide is formed to form an ink ribbon and a plate on the platen. The paper guide has a mask plate for partitioning the space between the paper and a paper guide with a small distance from the platen on the paper discharge side, and the mounting portions located on both sides of the needle guide on the paper discharge side from the needle guide are the paper guides. A holding portion for holding these mounting portions is provided on the carrier, and when thick paper is inserted, the upper portion of the paper guide is elastically deformable so that the upper portion of the paper guide separates from the platen and the lower portion approaches the platen side. A paper guide device characterized in that