JPS61287775A - Paper feeder - Google Patents

Abstract

PURPOSE:To reduce the margin at a trailing end part of a paper, by providing a paper bail member for pressing the paper against a feeding roller between a pinch roller and a recording head. CONSTITUTION:The paper bail member 10 is turnably supported on a pinch roller shaft 9, and is energized clockwise by a tension spring 13 fitted between an arm form projected part 11 integral with the member 10 and a base 12, whereby a tip part of the member 10 is pressed against the feeding roller 1. Accordingly, since the paper can be pressed against the roller 1 between the pinch roller 3 and the recording head 5, the paper can be securely fed until it is separated from the member 10, whereby the distance from the trailing end of the paper to the recordable part of the paper can be shortened, and the blank part can be made smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a paper feeding device that feeds paper to a recording head in a recording device such as a printer, facsimile, or typewriter.

[Prior art]

As the paper feeding device, there is a type in which a pinch roller is provided in pressure contact with the feeding roller, and by rotating the feeding roller, the paper fed between the feeding roller and the pinch roller is fed through the rad to the recording. .

In a recording device equipped with this type of paper feed device, there is a certain distance between the pinch roller and the recording head, and when the trailing edge of the paper passes the pinch roller and leaves it, it actively moves the paper. Since the paper cannot be fed, there was a problem that the unrecordable area at the rear end of the paper in the paper feeding direction, that is, the margin area, became quite large (for example, 30 cranes).Especially for small paper such as postcards. When recording, especially when recording horizontally, the margin becomes larger than necessary, which is undesirable.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device of the above type that can solve the problems of the prior art and can reduce the margin at the trailing edge of the paper.

〔overview〕

The present invention provides a paper pressing member that presses the paper against the feed roller between the pinch roller and the recording head.
This aims to achieve the above objectives.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a longitudinal section of a paper feeding device according to one embodiment, and FIG. 2 shows a partial front view taken from line n-tr in FIG.

In FIG. 1, pinch rollers 2.3 are provided at two locations on the circumference of the feed roller 1 (lower half in the example shown) so as to be able to come into contact with and separate from the pinch rollers. A paper guide 4 for guiding the paper is installed in the half part).

The paper is fed from the direction of arrow A to the pressure contact part of the pinch roller 2, and by driving the feed roller 1 in the direction of arrow B with a stepping motor or the like, the paper is fed along the feed roller to the recording paper installed above the front side. The paper is fed through the spatula 5 at a desired pitch.

The recording head 5 faces a platen 6 extending in the direction of the paper, and the paper is fed between the recording head and the platen.

In the illustrated example, the recording head 5 is a thermal head for thermal transfer recording, and the recording head is provided on a heat sink 7 that is pivotally supported by a carriage that moves in the width direction of the paper.

The pinch roller 2.3 is rotatably supported by pinch roller shafts 8.9, and is switched between a press position shown by a solid line and a separated position shown by a two-dot chain line via each pinch roller shaft.

The feed roller 1 and each pinch roller 2.3 are arranged at, for example, 1 to 4 locations at predetermined intervals.

A paper pressing member 10 is provided between the pinch roller 3 (pinch roller on the downstream side in the paper feeding direction) and the recording head 5 to press the paper against the feeding roller 1.

In the illustrated example, the paper pressing member 10 is rotatably supported by a pinch roller shaft 9, and is stretched between an integrally provided arm-shaped protrusion 1) and a base (or frame) 12. It is biased clockwise in FIG. 1 by a suspended tension spring 13, and its tip is pressed against the feed roller 1 (through the paper when feeding the paper).

The shape and dimensions of the paper presser member 10 can be selected as desired by taking into consideration the positional relationship with the surroundings and the position of the paper presser (in the illustrated example, the position of the tip portion pressed against the feed roller 1). .

According to the above configuration, the paper pressing member 10 presses the paper against the feed roller 1 between the pinch roller 3 and the recording pad 5.
The paper can now be reliably fed until it leaves the paper holding member, and the distance from the trailing edge of the paper to the recordable area can be shortened accordingly. It becomes possible to reduce the number of parts.

In this case, if the length of the paper pressing member 10 is increased and the paper pressing position is moved closer to the recording head 5, the margin can be reduced accordingly. For example, the conventional margin (minimum margin) is 30
By providing the paper pressing member 10, the amount that was approximately fi can be easily reduced to approximately 10 to 15 amounts.

In the above embodiment, the case of a serial type thermal (thermal transfer, etc.) link in which the thermal head 5 is mounted on a carriage is shown, but the present invention is applicable to other types of recording devices such as wire dot printers, inkjet printers, and typewriters, as well as to line printers. The present invention can be similarly applied regardless of the recording method, such as a printing method or a color printing method having multiple heads.

Further, in the illustrated structure, the paper presser member 10 is installed near the pinch roller 3 using the pinch roller shaft 9, but this paper presser member may be attached by other means and placed at another position in the direction of the paper. be able to.

[Effects of the Invention] As is clear from the above description, the present invention provides a paper feeding device that can reduce the margin at the trailing edge of paper in a device that uses pinch rollers to feed paper.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a paper feeding device according to an embodiment of the present invention, and FIG. 2 is a partial front view taken along line nn in FIG. 1. 1--Feed roller, 2.3--Pinch roller, 5--Recording head, 10--Paper pressing member. Agent: Yasushi Ooto, Patent Attorney Figure 1 Figure 2

Claims (1)

[Claims] (1) In an apparatus that includes a pinch roller that is in pressure contact with a feed roller and that rotates the feed roller to feed paper between the pinch roller and the recording head, the pinch roller and the recording A paper feeding device comprising a paper pressing member that presses the paper against the feeding roller between the head and the paper feeding device.