JPS62292467A - Paper guide device - Google Patents

Abstract

PURPOSE:To enable even a thin printing paper to be stably fed, by pressing driven rollers against a platen by supporting the roller by a lever energized by a spring, and projecting on the lever a guide are proximate to the platen on the downstream side of the driven rollers with respect to the feeding direction of a printing paper. CONSTITUTION:When a printing paper 7 guided by a paper guide member 8 is clamped between a main body 3 of a platen 1 and driven rollers 5, the rollers 5 are spaced from the main body 3 of the platen by an amount corresponding to the thickness of the paper 7, and the movement of the rollers 5 is transmitted to a guide arm 17 through a lever 12, whereby an optimum gap for feeding the paper 7 is formed between a guide surface 18 of the arm 17 and the peripheral surface of the main body 3 of the platen. Accordingly, even when the load of a printing head 10 acts on the feeding of the paper 7 by the platen 1 and driven rollers 6, the paper 7 is stably fed under the function of the guide surface 18 of the guide arm 17, and wrinkling or staggering will not occur even when a thin printing paper 17 is used.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is applicable to output PR of computers, facsimiles, etc.
Paper guides used in printers, blocks, etc.
Set it to 4A.

[Conventional technology]

FIG. 1 shows a conventional paper guide device installed in the printer described above, in which a platen 1 is composed of a rotating shaft 2 and a cylindrical platen main body 3 supported by the rotating shaft 2. A driven roller 5 which is in contact with the circumferential surface of the platen main body 3 by a spring 4 is disposed below the .
Further, above the platen 1, a driven roller 6 that presses against the circumferential surface of the platen body 3 is disposed. Roughly speaking, fixed paper guide members 86 and 9 for feeding the printing paper 7 along the platen 1 are provided on both sides of the IX 4jl roller 5 at a small distance a from the platen body 3 of the platen 1 in the ratio axis direction. It is arranged so that it has. Furthermore, this paper guide member 9 and the following! ! A print head 10 is disposed so as to face the platen body 3 between the J[] and the rollers 6.

According to such a configuration, by rotating the rotation shaft 2 of the platen 1, the platen head of the platen 1 is rotated.

Since the driven rollers 5 and 6, which are in pressure contact with the circumferential surface of the body 3, are driven, the platen 1 and the driven rollers 5, 6
The platen 1 is rotated [1] with the printing paper 7 held between them.
By intermittent driving in the direction, the printing paper 7 is sent in the direction of the arrow.

Therefore, by intermittent feeding of the printing paper 7 and printing on the printing paper 7 by the print head 10, it is possible to perform desired printing at a predetermined position on the printing paper 7.

[Problem that the invention seeks to solve]

By the way, in general, when feeding during printing, the printing paper 7 is fed so that the print head 10 joins the printing paper 7 on the platen 1, so the printing paper 7 is moved by the upper driven roller 6 and the platen 1. The load of the print head 10 being joined to the print paper 7 is applied to the feed. Further, since the distance a between the platen 1 and the paper guide member 9 is large, when printing on thin printing paper 7, the part that is sandwiched between the platen 1 and the driven roller 5 and reaches the inside of the paper guide member 9 There is a risk that wrinkles may occur in the printing paper 7 or that the printing paper 7 may meander.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper guide design that overcomes the above-mentioned problems with the conventional paper guide and can stably feed even thin printing paper.

[Means for solving problems]

In the present invention, when printing paper is sandwiched and fed between a platen and a driven roller that applies 1 g of pressure to the platen, the driven roller is supported by a spring-biased lever and brought into pressure contact with the platen. This lever is characterized by a guide arm L\ protruding from the platen and close to the platen on the downstream side of the platen and the driven roller in the printing paper feeding direction.

[For production]

According to the present invention, when the lever is rotated due to the printing paper being held between the platen and the driven roller,
Since the distance between the guide arm and the platen is formed to match the thickness of the print paper, it is possible to stably feed print paper of various thicknesses even when the load from the print head is applied to the print paper. .

(Example) The present invention will be explained below with reference to the embodiment shown in the drawings.For the same structure as the conventional one mentioned above, the same reference numerals (=J L, Omitted.

1 and 2 show an embodiment of the present invention, in which a printing paper 7 is placed upstream of the driven roller 5 that presses against the circular surface of the platen main body 3 of the platen 1 and at nine positions adjacent to the driven roller 5. The distance between the platen main body 3 and the paper guide member 8 that guides is relatively large, for example, about 1 mm. 2M, a plurality (for example, 2 to 6) of cages 111 are formed at intervals in the axial direction of the platen 1. A bell crank-shaped lever 12 is disposed near each opening 11 so as to be movable by a support shaft 13 parallel to the rotating shaft 2 of the platen 1. bracket 14
is integrally protruded from the bracket 14, and the driven roller 5 is attached to the platen body 3 of the printing paper 7 by a support shaft 15 parallel to the rotating shaft 2 of the platen 1. ing. And also the lever 12 (
A tension coil spring 16 is interposed between the end portion and a fixed portion (not shown).
The driven roller 5 is pressed against the circumferential surface of the platen body 3 of the platen 1 by the spring force 6 .

A guide arm 17 is provided on one side of the platens 1 to 14 to guide the printing paper 7 on the downstream side of the driven roller 5. While connected to the peripheral surface of the main body 3, the platen 1 is provided with an arc-shaped guide 18 having an extremely small distance C from the platen main body 3, and this distance C is, for example, 0.1 cm. It is said that C.

15. The driven roller 5 is the platen body 3 of the platen 1.
When in pressure contact with each other, this guide surface 18 draws a concentric circle with the platen main body 3.

Next, the FL version of the above-mentioned embodiment will be explained.

The printing paper 7 guided by the paper guide member 8 is placed on the platen 1.
When it is held between the platen main body 3 and the driven roller 5,
The driven roller 5 moves the platen body 3 by the thickness of the printing paper 7.
The movement of the driven row 55 is transmitted to the guide arm 17 via the lever 12, and the movement of the driven row 55 is transmitted to the guide arm 17 via the lever 12.
Between the guide surface 18 and the circumferential surface of the platen body 3, an optimum interval is formed for feeding the printing paper 7, which is the thickness of the printing paper 7 plus O and Lm, for example.

Therefore, even if the load of the print head 10 acts on the feeding of the print paper 7 by the platen 1 and the driven roller 6, the guide surface 18 of the guide arm 17
The feeding is performed stably, and even when using thin printing paper 7, no wrinkles or meandering occur.

According to this embodiment, since the guide surface 18 of the guide arm 17 always forms a distance between the platen body 3 of the platen 1 and the platen body 3 suitable for the thickness of the printing paper 7, printing paper of various thicknesses can be handled. 7 can be sent stably.

Note that the present invention is not limited to the embodiments described above, and various modifications are possible.

〔Effect of the invention〕

As explained above, according to the present invention, printing paper of various thicknesses from thin B to thick can be stably processed to further improve printing reliability.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of a single paper guide according to the present invention. Fig. 2 is a vertical cross-sectional side view, Fig. 2 is a front view of the main parts of Fig. 1, and Fig. 3 shows a conventional paper guide neck. It is a vertical side view. 1...Platen, 3...Platen body, 5.6...
- Followed roller, 7... Print paper, 8.9... Paper guide member, 10... Print head, 12... Lever, 1
7... Guide arm, 18... Guide surface. Applicant's agent Shunsuke Nakao (Fig. 1 It) 2nd X 3rd t2!

Claims (1)

[Scope of Claims] 1) In a device that feeds printing paper by sandwiching it between a platen and a driven roller that is in pressure contact with the platen, the driven roller is supported by a spring-biased lever and brought into pressure contact with the platen, and the lever A paper guide device characterized in that a guide arm is provided protruding from the platen and close to the platen downstream of the platen and the driven roller in the printing paper feeding direction. 2) The paper guide device according to claim 1, wherein a plurality of driven rollers, levers, and guide arms are arranged at intervals in the axial direction of the platen.