JPH07266641A - Paper feeder for printer - Google Patents

Abstract

(57) [Summary] [Purpose] To press the pressing roller uniformly against the platen surface without hindering the conveyance of continuous paper. In a printer having a cut paper guide plate 1 on the upper side and a continuous paper guide plate 6 on the lower side, a pair of pressing springs 8 provided on the outside of the continuous paper guide member 6 urges the sheet. When the supporting rod 7 is bent upward by a reaction force during paper feeding by connecting the supporting rod 7 to the press rollers 3 and the ribs 4a and 4a immediately below the supporting rollers 3 and 3 to support the cut sheet guide member 1. However, the pressing rollers 3 and 3 can be pressed uniformly against the platen roller 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device used in a printer.

[0002]

2. Description of the Related Art Generally, in a printer using cut-sheet paper, it is necessary to rotate a pressing roller in contact with a platen with a constant pressing force.
As shown in Japanese Patent Laid-Open No. 2 (1994), a structure is adopted in which the pressing roller support shaft is pressed against the platen by a spring.

On the other hand, in a printer capable of recording and writing on both single-cut paper and continuous paper, it is necessary to separate the pressing roller from the platen when feeding the continuous paper, and the peripheral speed of the platen is set to that of the push tractor. Since it is necessary to increase the peripheral speed by about 0.3% and the mechanism becomes quite complicated, there has been proposed a device that feeds cut paper and continuous paper via different paper conveyance paths. .

In particular, in such a paper feeding device in which cut sheets and continuous paper are fed through the upper and lower paper guiding paths, the structure can be simplified and the device can be made compact. Suitable for small printers,
On the other hand, in the case of such a configuration, the spring acting on the pressing roller supporting shaft must be arranged outside the feeding path of the continuous paper. Therefore, it seems that a thick cut sheet is used. In this case, the feed roller support shaft supported at both ends is curved in a concave shape with respect to the platen, and as a result, the left and right pressing rollers cannot be pressed accurately and evenly against the platen. Is derived.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to:
The cut paper and continuous paper can be conveyed via different paper paths, and the pressing roller for the cut paper can be evenly pressed against the platen. Furthermore, the gap between the cut paper and continuous paper passes. Another object of the present invention is to provide a new paper feeding device capable of uniformly setting the paper feed.

[0006]

That is, according to the present invention, as a paper feeding device of a printer for achieving such a problem, a cut sheet guide member having at least a pair of right and left pressing rollers is provided. The support member is coupled in the vicinity of the disposition position, and the support member is urged in the platen direction by a pair of urging members provided outside the continuous paper transport path.

[0007]

With this configuration, even if the support member is curved due to the reaction force during the conveyance of the cut sheet, the press roller is kept horizontal while the cut sheet guide member is always kept horizontal. Press on the platen surface correctly and evenly.

[0008]

Embodiments Now, the embodiments shown in the drawings will be described. 1 to 3 show an embodiment of the present invention.

In the drawing, reference numeral 1 is a cut paper guide plate for guiding the cut paper toward the platen roller 10, and this guide surface 2
A pair of left and right presser rollers 3, ... Rolling in contact with the peripheral surface of the platen roller 10 are rotatably supported on the upper side and the lower side in the conveying direction. The ribs 4 are formed so as to project in a direction parallel to the paper conveying direction, and the continuous paper fed onto the continuous paper guide plate 6 disposed below the continuous paper guide plate 6 and the ribs 4 ... The lower edge of the platen roller is guided to the peripheral surface of the platen roller.

On the other hand, these ribs 4 ... Form a connecting portion with a supporting rod 7 for supporting the cut paper guide plate 1, and ribs 4a, 4a located immediately below the left and right pressing rollers 3 ,.
At the middle of the front and rear presser rollers 3, ...
Insertion holes 5a, 5a for tightly fitting the sheets are formed, and the ribs 4b located on both sides of the insertion holes 5a, 5a.
Long holes 5b extending in the vertical direction, which extend toward the side, and ribs 4c, which are located inside thereof, are provided with the cut sheet guide plate 1.
Long holes or stupid holes 5c extending in the direction away from each are provided so that the connecting relation can be maintained without any trouble even when the supporting rod 7 is curved upward concave due to the reaction force at the time of paper feeding. It is configured.

On the other hand, the support rod 7 supports the cut paper guide plate 1 via the ribs 4a, 4a immediately below the pressing rollers 3 ... As described above, while the support rod 7 itself is outside the continuous paper guide plate 6. The pair of left and right pressing springs 8 disposed on the sheet receiving the upward urging force, the front, rear, left and right pressing rollers 3 on the cut sheet guide plate 1.
Are equally pressed against the peripheral surface of the platen roller 10.

Reference numeral 11 in the figure denotes a platen roller 10.
2 shows a recording head that runs in the axial direction along the circumferential surface of the paper, a reference numeral 12 denotes a push tractor arranged on the upper side of the continuous paper guide plate 6 in the paper conveying direction, and a reference numeral 13 denotes the pressing spring 8 described above. The spring holders formed on both sides of the lower case 14 for holding are shown.

In the embodiment configured as described above, the cut sheet guide plate 1 includes the press rollers 3, 3 and the ribs 4a and 4 immediately below.
The intermediate portions of the front and rear presser rollers 3, 3 are supported by the support rod 7 via a, and in this state, the presser rollers 3, 3 are
Are equally pressed against the peripheral surface of the platen roller 10 by the urging force of the pressing springs 8, 8 acting on both ends of the support rod 7.

Under this condition, when a thick cut sheet is fed into the peripheral surface of the platen roller 10,
As shown by the chain double-dashed line in FIG. 4, these pressing rollers 3 are displaced downward in the figure by an amount δ corresponding to the paper thickness, and the downward reaction force is exerted via the cut paper guide member 1. The support rod 7 that has received is largely curved and deformed in an upward concave shape with the left and right pressing springs 8, 8 as fulcrums.

However, as described above, the support rod 7 is provided with ribs 4a and 4a located immediately below the press rollers 3 and 3, respectively.
a through the insertion holes 5a and 5a, and these ribs 4
Since the cut paper guide member 1 is supported via a and 4a, the guide member 1 maintains a horizontal state regardless of the deformation of the support rod 7 and is lowered by an amount δ corresponding to the paper thickness. The cut sheets that have been displaced to the peripheral surface of the platen roller 10 are brought into close contact with the peripheral surface of the platen roller 10 by the pressing rollers 3 ...

[0016]

As described above, according to the present invention, the cut paper guide member is held by the support member urged by the pair of urging members provided outside the continuous paper conveying path. Since it is supported in the vicinity of the part, it is possible to support the cut paper guide member without hindering the conveyance of continuous paper, and the flat paper guide member is always flat regardless of whether the support member is bent or not. In this state, the pressing roller disposed on the guide surface is pressed uniformly and evenly against the surface of the platen, so that accurate paper feeding can be achieved.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing the above apparatus from a side surface.

FIG. 3 is an exploded perspective view of the same device.

FIG. 4 is an explanatory view showing a supporting state of the same apparatus.

[Explanation of symbols]

 1 Single-cut Paper Guide Plate 3 Pressing Roller 4 Rib 5b Insertion Hole 6 Continuous Paper Guide Plate 7 Support Rod 8 Pressing Spring 10 Platen

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaki Shimomura 3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation (72) Inventor Kazuhiko Yamaguchi 3-3-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Within the corporation

Claims (1)

[Claims] 1. A printer in which a sheet-cut sheet conveying path and a continuous-sheet sheet conveying path are arranged one above the other, wherein the sheet-cut sheet guiding member is provided with at least a pair of left and right pressing rollers for pressing the sheet-cut sheet against a platen. It is characterized in that it is coupled to a supporting member in the vicinity of the disposition position of both pressing rollers, and that the supporting member is urged in the platen direction by a pair of urging members provided outside the continuous paper conveying path. Paper feeding device for printers.