JPH03161371A - Printer paper feed device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A printer paper feeding device for feeding printing paper while guiding it in a printer, which always maintains a predetermined constant paper path interval without requiring high-precision processing and manufacturing. A first roller rotationally driven to feed the paper;
a second roller biased toward the first roller so as to be rotatable so as to sandwich the paper between the first roller and the first roller; The paper guide member for guiding the paper between the second roller and the second roller is configured by attaching the paper guide member to a support portion that supports the second roller.

[Industrial application field]

The present invention relates to a paper feeding device for a printer that feeds printing paper while guiding it in the printer.

Paper is fed by sandwiching the paper between two rollers and rotating the rollers, but in order to do so, it is necessary to correctly guide the paper between the two rollers.

[Conventional technology]

Figure 4 shows the paper feeding device of a conventional printer.
5l is the main body frame of the printer. 52 is a platen that is rotationally driven. A paper feed roller 53 is rotatably supported by a bearing arm 54 biased toward the center of the platen 52 by a coil spring 56.
It is pressed against 2. Then, the paper guide member 55 is attached to the main body frame of the printer so that there is an interval (paper path interval) t for the paper to pass along the outer periphery of the platen 52.
attached to l. Therefore, if paper is inserted along the paper guide member 55 from the direction of arrow E, the paper will be guided to the pressure contact portion between the platen 52 and the paper feed port roller 53, and will be sandwiched between the platen 52 and the paper feed roller 53, and the paper will be fed. will be held.

[Problem to be solved by the invention]

However, as described above, in the paper feed device of the conventional printer, the paper guide member 55 is attached to the main body frame 51, so the mounting position of the platen 52 to the main body frame 5l and the mounting position of the paper guide member 55 may be misaligned. If this is integrated, a considerable error will occur in the paper path interval t.

If this interval t is inappropriate, problems such as impressions and wrinkles on the paper will occur.

In order to prevent such problems from occurring, the platen 52 mounting position and paper guide member 55 mounting position of the main body frame 5l should be processed and manufactured one by one with high precision, but this requires high cost. There was a drawback that it took a while.

Further, even when the accuracy of processing and manufacturing is improved, the paper path interval t changes due to thermal expansion or contraction due to temperature changes, and impressions, wrinkles, etc. may occur on the paper.

The present invention aims to eliminate such conventional drawbacks and provide a paper feed device for a printer that can always maintain a predetermined constant paper path spacing without requiring highly detailed processing and manufacturing. purpose.

[Means to solve the problem]

In order to achieve the above object, a paper feeding device for a printer according to the present invention, as shown in FIG. a second roller 2 which is biased towards the first roller I and is rotatably arranged so as to rotate with the paper sandwiched therebetween; and the first roller l. and a paper guide member 3 for guiding the paper between the second roller 2 and the second roller 2. Features.

The paper guide member 3 and the support section 4 may be integrally formed by plastic molding, and the I-th roller I may be a platen.

[Effect]

The paper guide member 3 has a support section 4 that supports the second roller 2.
Since the paper guide member 3 is attached to the second roller 2, the relative position of the paper guide member 3 with respect to the second roller 2 is always constant.
If the roller 2 moves, the paper guide member 3 moves along with it.
also move.

The second roller 2 is urged toward the first roller l, and the positional relationship between the second roller 2 and the first roller l is always constant without being influenced by the frame or other peripheral parts. becomes. As a result, the paper guide member 3
It is possible to always maintain the same positional relationship with respect to the roller 1, and to stably maintain a predetermined constant paper path interval T.

〔Example〕 Examples will be described with reference to the drawings.

FIG. 3 shows a printer device. 1 is a platen (first roller), which is rotationally driven by a line feed motor (not shown) to feed the paper.

I1 is a carrier, which is moved along the stay shaft l2 in a direction parallel to the axis of the platen l by a space motor (not shown). A print head l3 is fixedly mounted on the carrier 11 at a position facing the platen l. 14 is a ribbon cassette detachably attached to the carrier 11.

FIGS. 1 and 2 show the paper feeding device portion of the embodiment, in which the second roller 2 is urged toward the platen (first roller) l and is pressed against the platen l. Second
A plurality of rollers 2 are provided, and each roller 2 is fixed to a common rotating shaft 2a. Therefore, all the rollers 2 perform the same rotational motion together with the rotating shaft 2a.

4 is a bearing (
A rotating pongee 2a is rotatably fitted into a U-shaped groove 4a. Then, the bearing 4 and the rotating shaft 2
A second roller 2 is pressed against the platen l via a.

Reference numeral 3 denotes a paper guide member that is arranged to have a radius slightly larger than the radius of the outer periphery of the platen 1 in order to guide the paper along the outer periphery of the platen 1. In the present invention, the paper guide member 3 and the bearing 4 are integrally formed using a plastic mold, as shown in FIG. That is, the paper guide member 3 is formed into a fork shape having three slits, the pongee receiver 4 is arranged between the central slit, and the second roller 2 is arranged in each of the slits on both sides. .

The paper guide member 3 and the bearing 4 are integrally formed.
is rotatably supported by the main body frame 10 of the printer device at the tip end of the arm 6 that projects upward.

The bearing 4 and paper guide member 3 integrally formed in this way
For example, four sets are arranged in one row.

Therefore, a total of eight second rollers 2 are used.

As shown in FIG. 1, the rotating pongee 2a passes under the paper guide member 3 (back side), and the second roller 2 protrudes from the surface of the paper guide member 3 and is pressed against the platen l. There is. Therefore, the amount of protrusion of the second roller from the surface of the paper guide member 3 becomes the interval T between the platen l and the paper guide member 3 (paper path interval).

Therefore, if the radius of the second roller 2 is R1, the radius of the rotating pongee 2a is r1, and the distance from the bottom of the U-shaped groove 4a of the bearing 4 to the surface of the paper guide member 3 is A, then the paper path interval T is T= (R+r )-A.

In other words, the paper path interval T is determined by R, r, and A, which are dimensions completely unrelated to the dimensional accuracy of the main body frame of the printer, the mounting position accuracy of the platen 1 and the arm 6, and the like.

These R and r are the radius of the second roller 2 and the rotating pongee 2a.
Since the radius is , there is originally little dimensional error. Further, A is determined by the dimensional accuracy of the plastic molding die, so there is no need for high precision processing when manufacturing individual parts, and there is almost no variation. Therefore, the paper path interval T can have a constant predetermined dimension without variation from product to product.

As a result, if you insert the paper from the direction of arrow F in Figure 1,
The paper is smoothly guided to a paper path between the platen l and the paper guide member 3, and is fed between the platen l and the second roller 2 in the direction of the print head l3.

It should be noted that the present invention may be applied to any portion of the paper conveying device other than the portion where the platen is used, and the two rollers may be of any size. Furthermore, any type of print head may be used.

〔Effect of the invention〕

According to the paper feeding device of the printer of the present invention, the position of the paper guide member relative to the roller is always maintained at a constant position, and as a result, the paper path interval for guiding the paper is always a predetermined constant interval, so that the roller and paper There is no need to process and manufacture each guide member mounting position with high precision at a high cost, and without being affected by temperature changes, etc.
It has an excellent effect of allowing smooth paper feeding without creating impressions or wrinkles.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the embodiment, FIG. 2 is a partial perspective view of the embodiment, FIG. 3 is an overall perspective view of the printer of the embodiment, and FIG. 4 is a side sectional view of the conventional example. In the figure, l: platen (first roller), 2: second roller, 3: paper guide member, 4: bearing (supporting part). Fig. 1 A cross-sectional view of the fourth side of the tsunaga #1. Fig. 1 Part #+ view of the tsunaga example. Fig. 2 An overall perspective view of the tora yododa'lcb fwanta.
Cross-sectional view

Claims (1)

[Scope of Claims] 1. A first roller (1) that is rotationally driven to feed the paper; and a roller that is rotatable so that the paper is sandwiched between the first roller (1) and rotated; A second roller (2) is biased toward the first roller (1), and the paper is placed between the first roller (1) and the second roller (2). A printer having a paper guide member (3) for guiding the paper, characterized in that the paper guide member (3) is attached to a support portion (4) that supports the second roller (2). Paper feeder. 2. The paper feed device for a printer according to claim 1, wherein the paper guide member (3) and the support portion (4) are integrally molded using a plastic mold. 3. Claim 1, wherein the first roller (1) is a platen.
Or the paper feeding device of the printer described in 2.