JPS62257871A - Recording paper discharging device - Google Patents

Abstract

PURPOSE:To accurately record on a sheet without contaminating the printing surface of the sheet and discharge the sheet onto a discharged-paper stacker, by setting the circumferential velocity of a paper-discharging roller making contact with the non-printed side of the sheet to be higher than a paper-feeding velocity in a printer. CONSTITUTION:Of a pair of paper-discharging rollers 6, 7, the lower roller 6 is geared to a platen gear 12 to be rotated in the same direction as the platen 1, whereas the upper roller 7 is energized toward the lower roller 6 by a spring, and is rotated at a circumferential velocity equal to the velocity of a sheet S clamped between the rollers. Therefore, the upper roller 7 does not rub the printing surface of the sheet S. The circumferential velocity of the lower roller 6, which makes contact with the back side of the sheet S, is set to be higher than the velocity at which the sheet S is fed by the platen 1 and a paper-feeding roller 15. Accordingly, the sheet S can be tensioned, and can be prevented from making undesired contact with a recording head 2. In addition, a recording pitch in a paper-feeding direction is prevented from becoming ununiform due to the slackening of the sheet S.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a recording paper ejecting device such as a printer or an automatic paper feeding device used when attached to a printer.

[Conventional technology]

Printers must be laid out so that they fit within a limited space of f''L.For this reason, the sheet conveyance path is folded back in a V-shape around the circumference of the platen, which requires a relatively large amount of space. In order to further reduce the flat space required, the paper and paper output are placed at large angles.

For this reason, in this type of printer, as shown in FIG. 6, the sheet S?
The leading edge of the sheet S is fed and recorded by the print head 2, and the leading edge of the sheet S is sent upward by paper discharge rollers a and b, and the finished sheet S is guided onto the paper discharge stacker C.

However, in this type of apparatus, the sheet S lifts up from the platen 1 as shown in FIG.
．． A problem arises in that the sheet S slides against the print head 2 and gets dirty or curls up, making it impossible to record and discharge accurately.

[Problem that the invention seeks to solve]

The present invention was developed in view of these problems, and its purpose is to provide a structure that allows accurate recording on a sheet without contaminating the printed surface of the sheet and ejecting the sheet onto a paper ejection stacker. The goal is to provide a simple device.

[Means for solving problems]

The recording paper ejecting device of the present invention is used for printing in a printer, and in the ejecting device for ejecting a recorded sheet, is the sheet brought into contact with both sides of the sheet and sent out, so that the sheet is placed in a vertical relationship with each other? Among the disposed paper discharging rollers, the circumferential speed of the discharging roller that contacts the non-printing surface of the sheet is made faster than the paper feeding speed at which the paper is fed by the printer.

〔Example〕

The details of the present invention will be explained below based on illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, in which a platen 1 that is connected to a driving force transmission mechanism (not shown) and rotates clockwise in the figure is arranged from the upper side in the rotational direction along its surface. An arcuate sheet guide plate 5 reaching the recording head 2 is provided, and a paper feed stacker 4 is attached above the paper feed side of the sheet guide plate 5.
, the cut sheets s stacked thereon are fed one by one onto one side of the platen by a feed roller 5, and the recording head 2 is placed on the lower side of the platen 1 in the rotational direction. A pair of paper ejection rollers 6.7, which will be described later, are disposed above, and the recording head 2 records a sheet (sheet) S? The paper is configured to be discharged onto a paper discharge stacker 8 disposed on the discharge side of the paper discharge rollers 6.7.

The chain line circle indicates a gear for driving a paper discharge roller 7, which will be described later, and is a paper pressing plate that urges the Sf platen 1 in the direction of the platen 1 by a spring 10d in the figure. Further, reference numeral 9 is a paper pail.

An embodiment of the pair of paper ejection rollers 6.7 mentioned above? Shown in Figure 2. The lower roller 7 is gear-coupled with the 6-wheel platen gear 12 and rotates in the same direction as the platen 1 2, and the upper roller 7 is biased toward the lower roller by a spring (not shown), and the sheet held between both rollers is ) is rotating at the same speed as the movement of S.

The lower roller 6 that comes into contact with the back surface of the sheet S is made of a friction-prone material such as rubber, and the upper roller 7 is made of a material such as rubber or plastic, and a recording method such as inkjet that does not dry easily after printing is used. If the sheet S is outside the printing area as shown in Figure 2? Arrange them so that they are sandwiched.

The circumferential speed of the lower roller 6 is determined by its outer diameter and the reduction ratio of the gear mentioned above, but the circumferential speed? Platen 1 and paper feed roller 1
Set it faster than the feed speed sent in step 5. For example, when the feed amount is 4.23 mm, the circumferential rotation amount of the lower roller 6 is set to about k 4-5 wx in the same time.

Since the platen 1 is strongly pressed by the paper feed roller 15, during normal printing, the periphery of the lower roller 6 and the lower roller 6 will be slipping. However, when the sheet S is elongated due to inkjet printing, the elongation occurs quickly. By absorption, the sheet S always comes into close contact with the surface of the platen 10.

The platen 1 is attached to the paper pail 9 by a spring (not shown).
direction, and the sheet S? It will work to align it along the circumference of platen 1. However, the spring force is determined so as not to interfere with the above-mentioned slack absorption, and consideration is given so that the sheet S will slide on the vapor pail 90 portion when pulled from above.

Since the peripheral surface of the upper roller 7 rotates at the same speed as the movement of the sheet S, even if the upper roller 7 is within the printing area, it will not rub the printing surface of the sheet S.

However, as there is an increasing need to print over the entire area of the sheet S, the upper roller 7 is further improved to have a triangular thin wall 16 on its circumferential surface so that it approaches a point contact with the surface of the sheet S. Forming a roller 17 as shown in FIG.
show. According to this, it is transferred to the roller by contacting the printed surface.
, constant stains are not transferred again to the sheet S surface.

The falling surface 16 is formed of metal or plastic, and metal is preferable because it is wear resistant and can be made thin.

FIG. 4 shows another embodiment of the paper ejection roller 6.7.

Both shafts of the paper ejection roller 6.7 are connected by gears at the ends.
The reduction ratio and outer diameter are determined so that the circumferential speed of the lower roller increases with respect to the circumferential speed of the platen 1, and the circumferential speed of the upper roller remains the same. Therefore, it always slides on the upper roller 7 and lower roller 6 on their circumferential surfaces.

In FIG. 4, the triangular teeth ? By setting the outer diameter of the upper row 217 to be equal to or smaller than that, the breakage of the seat S due to the triangular falling surface 16 is prevented.

In the above case as well, the lower roller 6 is S? In order to ensure that the sheet acts like a tensioner, slack can always be taken up from the sheet S. ◇ Figure 5 shows another example. For example, a plurality of upper rollers 17... and a plurality of lower rollers 6... are arranged in a staggered manner as shown in the figure, and both rollers 6.
The gap between the shafts of 17 is set closer than the length corresponding to the sum of the radii of each roller 6.17, and the shafts of both rollers 6.17 are coupled with gears so that both rollers can be driven and rotated. It is.

Both rollers 6.17? By arranging it in a staggered manner, the upper roller 1 with triangular thin teeth can be
Even if 7 is used, the sheet S escapes and the surface is not damaged. Furthermore, since they are arranged in a staggered manner, the distance between the axes of the paper ejection rollers 6 and 17 can be determined by giving priority to the distance between the axes of the gears, and can be freely selected based on the circumferential speed. Furthermore, both axes of the paper discharge rollers 6 and 17 are driven and rotated, so that the leading edge of the sheet S smoothly passes through both rollers 6 and 17, even though they are arranged in a staggered manner.
．． It's starting to catch on in 17 days.

〔Effect of the invention〕

As described above, according to the present invention, among the paper ejection rollers that contact both sides of the sheet and feed it out, the circumferential speed of the paper ejection roller that contacts the back side of the sheet is made faster than the paper feeding speed that is fed by the platen. With this configuration, it is possible to remove slack by applying tension to the sheet, thereby preventing contact between the recording head and the sheet. Recording pitch unevenness can also be eliminated.

Moreover, a large number of triangular teeth are provided on the circumferential surface of the 10,000 rollers that come into contact with the printed surface of the sheet, and the circumferential speed is made equal to the paper ejection speed or the paper feeding speed of the platen. , it is possible to eject printing lines without causing any irregularities even on materials that dry poorly after printing.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an apparatus showing an embodiment of the present invention, Fig. 2.4.5 is an explanatory diagram of an embodiment regarding the arrangement of paper ejection rollers, etc., and Fig. 3 is an example of an implementation of the upper paper ejection roller. Example illustration, 6th
．． FIG. 7 shows an embodiment of the conventional device. 1...Platen, 2...Print head, 6.7...
Paper discharge roller, 12, 13, 14. 15... Gear, 16
... Triangular falling surface, 17 ... Toothed upper roller or more Applicant Seiko Epson Corporation 6.71. Sayato 0-Flo; Sho Shihyo Laura

Claims (1)

[Claims] In a discharging device that discharges a recorded sheet printed by a printer, among the discharging rollers arranged in a vertical relationship that contact both sides of the sheet and send it out, the discharge roller that contacts the non-printing surface of the sheet. A recording paper ejecting device characterized in that the circumferential speed of the paper roller is made faster than the paper feeding speed fed by the printer.