JPS6139570Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, such as a paper discharge device for a typewriter, printer, word processor, etc.

A pair of rollers that are pressed against each other is used to send the paper discharged from the printing device to the paper discharge tray after printing. In high-speed typewriters, word processors, etc., printed paper is fed out almost continuously.

In printing devices of the type described above, the paper is generally fed diagonally upwards across the front of the printing device. Therefore, the pair of rollers that are pressed against each other are arranged so as to sandwich the paper without bending the traveling direction of the paper too much in order to smoothly bite the paper and provide feeding. That is, the rollers are arranged so that the plane connecting the axes of the two sets of rollers is substantially orthogonal to the plane of the paper. As a result, the rollers on the lower side of the paper are not placed vertically below the rollers on the upper side of the paper, but are positioned offset toward the paper output tray. When feeding paper with rollers arranged in this way, it often happens that the final edge of the paper remains on the lower roller, so that the leading edge of the following paper does not advance over the previous paper. , there may be cases where the paper crawls under the previous paper. When such a situation occurs, a problem arises in that the page order of the printed paper is disturbed. Furthermore, the leading edge of the succeeding paper pushes up the trailing edge of the previous paper, causing the paper to be pushed out of the paper output tray, or folding in the middle, causing disturbances in the paper on the paper output tray, which is inconvenient. .

The object of the present invention is to provide a paper ejecting device that eliminates the above-mentioned drawbacks.

In FIG. 1, a sheet of paper discharged from a platen 2 of a printing device 1 is guided by a guide 3 and raised, is fed by a paper discharge device, for example, a paper discharge roller 4, and is discharged onto a paper discharge tray 5.

As shown in FIG. 2, the paper discharge roller 4 includes a feed roller 7 as a second roller fixed to a shaft 6 driven by a drive unit (not shown), and a shaft 9 rotatably supported by a frame 8. It has a pinch roller as a first roller fixed to. axis 9 is axis 6
It is supported by a frame 8 and pressed by a spring 11 so as to be able to move toward. Therefore, the pinch roller 10 is pressed against the feed roller 7.

A guide plate 12 serving as a pressing guide means is rotatably supported on the shaft 9.

In the figure, an ear 1 attached to a guide plate 12 is shown.
3 is loosely fitted onto the shaft 9. The ears 13 can also be rotatably supported by other members attached to the frame 8 instead of the shaft 9. The tip of the guide plate 12 is formed so as to be in contact with the shaft 6 to be driven, and is in contact with the top of the shaft 6 due to its own weight. If necessary, a spring can be used to apply a pressing force to the shaft 6. At this time, the pressing force is selected so that the guide plate 12 can be rotated depending on the stiffness of the paper.

The paper contained in the frame 8 is wound around the platen 2, is pressed against the platen 2 by a pressure roller 14 and a paper bail 15 provided in the printing device 1, and is fed by the rotation of the platen 2.

The paper 16, which is being printed while being fed by the rotation of the platen 2, passes through the guide 3 as shown in FIG. 3a.
(See FIG. 1) while being guided by the sheet discharge rollers 4.

The paper 16 enters between the feed roller 7 and the pinch roller 10 while pushing up the guide plate 12. The paper 3 held between the feed roller 7 and the pinch roller 10 is fed by the driving force of the feed roller 7. Note that the feed roller 7 is driven in synchronization with the platen 2.

As the feeding of the paper 16 progresses and the leading edge is fed out from the leading edge of the guide plate 12 as shown in FIG. Most of the paper 16 is sliding on the paper discharge tray 5 when the terminal end of the paper 16 contacts the feed roller 7.

The end of the paper 16 is connected to the feed roller 7 and the pinch roller 1.
After passing through the nip position between 0 and 0, the paper normally can no longer receive the feeding action of the feeding roller 7. However, in this apparatus, the trailing end of the paper is pressed against the feed roller 7 by the guide plate 12 as shown in FIG. 3c. Therefore, the paper 16 is transferred to the feed roller 7
The paper is further fed by the feeding action caused by friction, and falls from above the feeding roller 7 onto the paper discharge tray 5.
In this case, even if the end of the paper is in contact with the feed roller 7, the guide plate 12 is not in effect, so when the next paper is fed, the leading edge of that paper is always the trailing edge of the previous paper. This may cause the stacked sheets of paper on the paper output tray to be thrown out of order, or the trailing edge of the previous paper may be pushed by the paper that comes after, causing it to fall from the paper output tray or be bent. was avoided.

By providing a guide plate with a simple structure that presses the paper of this device onto the feed roller, it is possible to always reliably feed the paper onto the paper output tray without being restricted by the positional relationship of the paper output roller. Summer.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a printing device according to the present invention;
Fig. 2 is a perspective view of the paper discharging device according to the present invention, and Fig. 3 is a side view showing the relationship between the paper discharging device and paper feeding. FIG. 3 is a diagram showing an operational relationship. 1... Printing device, 2... Platen, 3... Guide, 4... Paper ejection device, 5... Paper ejection tray, 6...
Drive shaft, 7...Feed roller, 9...Axis, 10...
Pinch roller, 11... spring, 12... guide plate.

Claims (1)

[Claims for Utility Model Registration] (1) Paper conveyed upward from the platen of a printing device is further pinched upward by a first roller and a second roller that face each other and at least one of which is a drive roller. In a paper discharge device that discharges the paper to a paper discharge tray provided on the second roller side while moving the paper along the outer periphery of the second roller after the paper is conveyed, the second roller is arranged at an appropriate interval in the width direction of the paper to be conveyed. It has a plurality of rollers arranged with
A position where the rollers enter between the plurality of second rollers, and a position where the second rollers are lifted upward, about an axis that is substantially parallel to the axis of the rollers and located on the opposite side of the second roller with respect to the paper conveyance path. and a pressing guide means that can rotate between the rollers and is biased toward a position where it enters between the second rollers, and the paper that is pinched and conveyed upward by the first roller and the second roller is A sheet discharging device characterized in that the sheet is pressed against the second roller by a pressing guide means that is biased to a position where it enters between the second rollers. (2) Utility model registration claim No. 1, characterized in that the surface of the portion of the pressure guide means that faces the second roller that enters between the second rollers is curved in such a direction that the tip approaches the second roller. The paper ejecting device according to item 1.