JPH04107168A - Paper guide mechanism of printer - Google Patents

Abstract

PURPOSE:To bring the printing place of paper and the periphery thereof into close contact with a platen by arranging a paper pressing means on the upper side of the printing surface of a printing head to mount the same on a paper guide member. CONSTITUTION:Paper 8 is fed while held between a paper feed roller 6 and a platen 4 and subsequently fed in the state held between a paper feed roller 5 and the platen 4 to be curved by the paper guide member 1 and discharged while held between a roller 2 being a paper guide member and the platen 4. Since the paper guide member 1 is formed from a material having elasticity, the roller 2 being the paper pressing means presses the paper 8 to the platen 4 by proper pressing force. By these operations, the paper 8 comes into close contact with the platen over the region from the paper feed roller 6 to the roller 2 being the paper pressing means.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper guide mechanism for a printer such as a serial printer.

[Prior art] The paper guide mechanism conventionally used in printers is
It has a structure as shown in Figure 3, and in order to guide the paper smoothly, most of the paper is almost parallel to the printing surface and is used with a small spacing. . Alternatively, as disclosed in Japanese Patent Application Laid-open No. 63-35371, a structure as shown in Fig. 4 is used to bring the printing area of the paper into close contact with the platen, and a suitable amount of paper is placed on both sides of the printing surface of the print head. There is a device in which a paper restraining means having a spring effect is attached to the paper guide member.

[Problem M to be Solved by the Invention] However, in the former method in which the paper is spaced from the printing surface, a situation arises in which the paper does not come into close contact with the platen and floats up during printing. In this case, if a printing operation is performed while the paper is lifted off the platen, there is a problem in that the printing sound becomes significantly louder.

In addition, even in the latter method, in which the paper guide member is equipped with paper holding means with an appropriate spring effect on both sides of the print surface of the print head, the paper does not reach the platen on the upper side of the print surface of the print head. A problem arises in that the print head does not come into close contact with the print head and floats up during printing, and when the print operation is performed, the print sound becomes louder.

The present invention is intended to solve these problems, and its purpose is to lower the printing noise generated during printing by bringing the printing area of the paper and its surroundings into close contact with the platen.

[Means for Solving the Problems] A paper guide mechanism for a printer according to the present invention includes a paper guide member disposed facing a printing surface of a print head and a platen. A paper holding means is provided above the printing surface,
The present invention is characterized in that the paper holding means is attached to the paper guide member.

[Example code] Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1(a) is a sectional view of the paper guide mechanism of the printer in the first embodiment of the present invention, and FIG. 1(b) is a sectional view of the paper guide mechanism of the printer of FIG. 1(a) from the platen side. It is a front view. In the drawings, 1 is a paper guide member, 2 is a paper holding device, a roller with rounded ends and a low coefficient of friction on the surface, 3 is an ink ribbon mask, 4 is a platen, 5. 6 is a paper feed roller 7 is a print head, and 8 is paper.

Here, the paper guide member 1 is made of an elastic material, and is installed so as to be substantially parallel to the printing surface of the print head 7 and facing the platen 4 so as to surround the printing surface. The paper guide member 1 is curved to match the curved surface of the platen 4 in the circumferential direction, and has a through hole in the center thereof in order to project the printing surface of the print head 7 toward the platen 4. The ink ribbon mask 3 having the above-mentioned ink ribbon mask 3 is attached.

The upper end of the paper guide member 1 is equipped with a roller 2, which serves as the paper holding means and whose both ends are rounded. The roller 2, which is the paper holding means, has a rotating shaft at both ends thereof, and the rotating shaft is connected to the paper guide member 1.
Fixed.

Therefore, the roller 2, which is the paper holding means, can freely rotate in the circumferential direction of the rotating shaft.

When the paper 8 is conveyed by the paper feed roller 5.6, the roller 2, which is the paper holding means, rotates following the paper 8. Therefore, the paper 8 can be smoothly conveyed between the roller 2, which is the paper holding means, and the paper feed roller 5, without being bent.

Further, when the paper guide member 1 moves left and right together with the print head 7 during printing, both ends of the roller 2, which is the paper holding means, are rounded, and the roller 2, which is the paper holding means, is rounded. Since the friction coefficient of the surface is low, it is possible to move the paper 8 without getting caught on the edges or the like.

The paper guide mechanism of the printer in this first embodiment has the above-mentioned configuration, and when printing on the paper 8, the paper 8 is sandwiched between the paper feed roller 6 and the platen 4. After being conveyed by being sandwiched between the paper feed roller 5 and the platen 4, and being bent by the paper guide member 1, the paper is conveyed between the roller 2, which is the paper holding means, and the platen 4. After that, it is ejected upward. At this time, since the paper guide member 1 is made of an elastic material,
The roller 2, which is the paper holding means, presses the paper 8 against the platen 4 with an appropriate pressing force. Through these operations, the paper 8 comes into close contact with the platen from the paper feed roller 6 to the roller 2, which is the paper holding means. Therefore, according to this first embodiment, the printing sound is reduced.

Next, the present invention will be explained using a second embodiment.

FIG. 2(a) is a sectional view of a paper guide mechanism of a printer according to a second embodiment of the present invention, and FIG.
In FIG. 1, which is a front view of the paper guide mechanism of the printer in a) from the platen side, 9.10.11 is a spherical pressing member which is paper holding means, and 12 is a compression spring.

This second embodiment differs from the first embodiment in that both ends are rounded and the friction coefficient of the surface is low, but instead of the roller 2, the spherical pressing members 9 and 10 serve as paper holding means.
11 was used.

In this case, since the compression spring 12 is used to apply appropriate pressure to the spherical pressing member, the paper guide member 1 does not need to be made of an elastic material. Note that the paper guide member 1 may be made of an elastic material and the compression spring 12 may not be used.

Even in this case, the same effect as in the first embodiment described above is obtained, and the printing sound is reduced.

[Effects of the Invention] As described above, the paper guide mechanism of the printer of the present invention includes a paper holding means disposed above the printing surface of the print head,
By attaching this paper restraining means to the paper guide member, the printed portion of the paper and its surroundings are brought into close contact with the platen, which has the effect of reducing the printing noise generated during printing.

[Brief explanation of the drawing]

FIG. 1(a) is a sectional view of a paper guide mechanism of a printer in a first embodiment of the present invention. FIG. 1(b) is a front view of the paper guide mechanism of the printer of FIG. 1(a) from the platen side. FIG. 2(a) is a sectional view of a paper guide mechanism of a printer in a second embodiment of the present invention. FIG. 2(b) is a front view of the paper guide mechanism of the printer of FIG. 2(a) from the platen side. FIG. 3 is a sectional view of a paper guide mechanism of a conventional printer. FIG. 4 is a front view of the paper guide mechanism of another conventional printer from the platen side. 1... Paper guide member 2.9.10.11.13.14... Paper holding means 3... Ink ribbon mask 4... Platen 5.6... Paper feed roller 7... Print head and above Figure 1 (a) Figure 1 (b) Figure 2 (a) Figure 2 (b) Figure 3 Figure 4

Claims (1)

[Claims] In a paper guide mechanism of a printer having a paper guide member disposed opposite to a platen together with a printing surface of a print head, a paper holding means is arranged above the printing surface of the print head, and the paper holding means is A paper guide mechanism for a printer, characterized in that the paper guide mechanism is attached to the paper guide member.