JPS58181678A - Recorder - Google Patents

Abstract

PURPOSE:To secure flatness of a recording medium and an ink sheet by aopplying an expansion component on a recording medium and an ink sheet with a guide roller widthwise toward both ends thereof immediately before the position of recording and transferring to expand wincles forcibly along the feed direction. CONSTITUTION:As an ordinary paper 8 and an ink sheet 9 move toward a platen roller 12 being pressed against a guide roller 24, components F1 and F2 of a force F along the feed direction thereof is applied on the oridinary paper 8 and the ink sheet 9 as expansion component outwardly toward both the sides thereof from the center because of the drum-shaped guide roller 24. This can exp and possible wrincles along the feed direction on the ordinary paper 8 and the ink sheet 9 by the expansion action of the guide roller 24 and move it flat to the position of recording and transferring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device using a thermal transfer method or an electric transfer method in a facsimile, a printer, or the like.

Conventionally, for example, a thermal transfer type recording apparatus has a thermal head (1) and a platen roller (2), as shown in FIG.
) The ink is thermally melted and transferred via a roll-shaped ink sheet (4) that is laminated and integrated with this plain paper (3) to a roll-shaped plain paper (3) that is conveyed through the paper. It is something. In this way, when recording is performed with the thermal head (1) while drawing out the plain paper (3) and the ink sheet (4) with the platen roller (2), a force F is applied. This power F
is relative and equal to back tension. Here, due to non-uniformity in the cylindrical shape of the roll body (5), non-uniformity in cylindricity and hardness of the platen roller (2), this force F becomes non-uniform in the axial direction of the platen roller (2), and the thermal head ( 1) The plain paper (3) and the ink sheet (4) heading between the platen rollers (2) are wavy, causing wrinkles (6) along the feeding direction as shown in FIG. Therefore, in the conventional system in which a guide roller or pack tension roller is provided between the roll body (5) and the platen roller (2), this back tension is applied to the platen roller (2).
It is difficult to keep constant as it changes depending on the tension of 1 lll and the inertial load of various rollers, etc., and it is only effective against wrinkles (7) perpendicular to the feeding direction as shown in Figure 2. do not have.

The present invention has been made in view of these points, and an object of the present invention is to provide a recording device that can reliably eliminate wrinkles along the feeding direction and improve printing quality.

The present invention forcibly smoothes out wrinkles along the feeding direction by applying a spreading force to both sides of the recording medium and ink sheet in the width direction just before the recording transfer position using a guide roller. The structure is such that the recording and transfer operation is performed while ensuring the accuracy.

A first embodiment of the present invention will be described based on FIGS. 3 and 4. This embodiment uses a thermal transfer method and is applied to a facsimile reception/recording device. First, a roll body made by pasting together and winding plain paper (8) as a recording medium and an ink sheet (9) is used. αO is provided, and it is set so that the thermal head C1υ and the platen roller (6) are pulled out to the recording transfer position in the stacked state. In other words, the platen roller (6) is driven by a step motor (
6) It rotates intermittently to perform sub-scanning.

A cutter (g) for plain paper (8) and a discharge roller αQ are provided between the platen roller (b) and the discharge tray α4. On the other hand, the ink sheet (9) is separated from the plain paper (8) at the body membrane from the recording transfer position and is wound up by the take-up roller (E) via guide rollers αη (to) (to). be. Here, the discharge roller (g) and the take-up roller 4 are rotated by an AC motor (c), but a friction disk () is interposed between the take-up roller and the take-up roller so that rotational force is constantly transmitted to the take-up roller. There is. Further, a friction pad is provided on the roll body (g) to press against the unwound lit (8) and ink sheet (9) so as not to cause any slack. Further, a guide roller (c) is provided immediately before the platen roller (2).

In this basic configuration, as the platen roller (B) rotates, the plain paper (8) and the ink sheet (9) are fed out from the roll body (G) for sub-scanning, and the thermal head αυ performs a reception recording operation. will be carried out. That is, an ink sheet (9) is placed on the thermal head CIυ side, the ink is placed on the plain paper (8) side, and this ink sheet (9) is wound up by a winding roller. The transferred plain paper (8) is separated from the ink sheet (9) at the position of the guide roller, the end of the recording is cut off by the cutter (G), and then transferred to the output tray (to) by the ejection roller (T).
is discharged. Here, the unrecorded end cut by the cutter) is pulled back to the recording transfer position by the reverse rotation of the platen roller (6) by the reverse rotation of the step motor (6). However, in the case of continuous recording, such pullback is not performed, and recording by the thermal head H continues, and when the page boundary reaches the cutter (c) position, this cutter (c)
) is configured to work.

The gist of this embodiment, however, lies in the guide roller (c), which, as shown in FIG. 4, is a drum-shaped roller whose center has a larger diameter than its opposite ends.

As a result, the plain paper (8) and the ink sheet (9) are brought into pressure contact with the guide roller (c) and the platen roller (c).
6) This guide roller (c)
is drum-shaped, so the component force Fl s F of the force F along the sheet feeding direction on the plain paper (8) and the ink sheet (9)
2 acts outward from the center on both sides as a tension component. This allows you to use plain paper (8) and ink sheets.
Even if the sheet (9) has wrinkles along the feeding direction, it is stretched by the stretching action of the guide roller (c) and moves toward the recording transfer position in a flat state.

Therefore, the recording operation can be performed satisfactorily without wrinkles.

By the way, the placement position of this guide roller (c) is usually M.
(8) and the mechanical properties of the ink sheet (9), the material and shape of the platen roller (6), etc. to set the optimum position. Further, the guide row 2 (c) may be either a driven type or a non-driven type. For example, if the conveyance speed of plain paper (8) is increased, the component force F,, F2 will be large and the effect will be great, but for plain paper (8), the force between platen and roller (2) Since it is necessary to allow slippage so that no slack occurs between the two, the optimum value is determined by taking into account the frictional force, heat generation, etc. As for the material of this guide roller (goods), whether it is a stopping type or a friction rotation type,
It is preferable to use a material having low friction against the plain paper (8) such as polyacetal or stainless steel, and rubber or the like may be used when rotating by the plain paper (8) without being driven.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, instead of the guide roller (F), a guide roller (B) is used, which is made of a metal roll body (C) with spiral protrusions (C) made of felt extending from the center to both ends on the outer peripheral surface of the metal roll body (C). It was there. This also creates a convex line)
As a result, the plain paper (8) and the ink sheet (9) are subjected to a stretching force from the center outward on both sides, and wrinkles are smoothed out. Here, it is preferable that this guide roller @ also be rotated at a low speed (as compared to the conveyance speed of the plain paper (8)), stopped, or reversed as shown in the figure. Further, the protruding stripes () do not necessarily need to be made of a material such as felt, but may be made integrally with the metal roll body (e).

Further, a third embodiment of the present invention will be explained with reference to FIGS. 6 to 8. This embodiment uses a guide roller that includes a curved shaft (c) whose central portion is advanced along the conveyance direction of plain paper (8) and an elastic shaft that is rotatable with respect to the end of this shaft via a sliding material end. 6 and is used. Polyacetal resin, felt, etc. are used as the sliding material edge.
Sponge, resin, etc. are used as the elastic pipe (7). Even with this configuration, the plain paper (8) and the ink sheet (9) are subjected to a stretching action similar to that of the drum-shaped guide roller due to the rotation of the guide roller 0υ.

Furthermore, a fourth embodiment of the present invention will be explained with reference to FIG. In this embodiment, a guide roller (to) is made up of a shaft 6'4 having a curved shape at the center and a roll body Q04 that is divided into left and right parts and rotatable around the shaft 04. It is something. Even with such a configuration, the plain paper (8) and ink sheet (9) passing through the guide roller (to) are stretched by a stretching force directed from the center to both sides in one direction. In this embodiment, in addition to an elastic body, metal can also be used as the roll bodies (2) and (2).

Although these embodiments have been described using a thermal transfer method, the same applies to an electric transfer method. For example, in Fig. 3, if the thermal head αυ is a multi-stylus head, and the guide rollers (C) and guide rollers αη (to) (to) are conductive rollers and return electrodes, an energized transfer method becomes possible. . Furthermore, the present invention is applicable not only to facsimile receiving and recording devices but also to printers.

As described above, the present invention includes a guide roller that applies a spreading force to both sides of the recording medium and ink sheet in the width direction immediately before the recording transfer position, so that wrinkles along the sheet feeding direction are eliminated. Even if there are wrinkles, they are forcibly stretched by this guide roller at the front stage of the recording transfer position, and the wrinkles can be eliminated.Therefore, the recording transfer operation is performed while ensuring flatness, and the printing quality can be improved. It is possible.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Fig. 2(a) is a perspective view showing the state of wrinkles, Fig. 3 is a side view showing the first embodiment of the present invention, and Fig. 5 is a perspective view showing the 20th embodiment of the present invention, FIG. 6 is a perspective view showing the third embodiment of the present invention, and FIG. 7 is a side view thereof. 8
The figure is a vertical front view, and FIG. 9 is a perspective view showing a fourth embodiment of the present invention. 8 f paper passing (recording medium), 9... ink sheet, 24
...Guide roller, 27...Guide roller, 31...
・Guide roller, 35... Guide roller Applicant Ricoh Co., Ltd. - Figure 7 Figure 30 Z and Figure 9 A

Claims (1)

[Claims] In a recording device that transfers recording from an ink sheet to a recording medium according to image information using a thermal transfer method or an electric transfer method, the recording medium and ink sheets that are conveyed in a stacked state are transferred immediately before the recording transfer position. A recording device characterized by being provided with a guide roller that applies a spreading tension force to both sides in the width direction.